Process for the production of microfibrillated cellulose in an extruder and microfibrillated cellulose produced according to the process

The present invention relates to a process for the production of microfibrillated cellulose wherein the process comprises the steps of, providing a slurry comprising fibers, adding the slurry to an extruder, treating the slurry in the extruder so that the fibers are defibrillated and microfibrillated cellulose is formed. The invention further relates to a microfibrillated cellulose produced.

TAMPON INCLUDING CROSSLINKED CELLULOSE FIBERS AND IMPROVED SYNTHESIS PROCESSES FOR PRODUCING SAME

A tampon pledget includes crosslinked cellulose fibers having microstructures treated to provide improved absorbency and higher wet strength. The fibers are treated with a crosslinking agent to provide at least one of a molecular weight between crosslinks of from about 10 to 200 and a degree of crystallinity of from about 25% to 75%. The crosslinking agent includes citric acid in 1% by weight. The crosslinking agent may further include sodium hypophosphite in 1% by weight. In another embodiment, the crosslinking agent may be a difunctional agent including a glyoxal or a glyoxal-derived resin. In still another embodiment, the crosslinking agent is a multifunctional agent including a cyclic urea, glyoxal, polyol condensate. The crosslinking agent is added in an amount from about 0.001% to 20% by weight based on a total weight of cellulose fibers to be treated and, preferably, in an amount of about 5% by weight. 1. A method for forming crosslinked cellulose fibers , comprisingselecting a cellulose raw material;steeping the raw material in a sodium hydroxide immersion to provide alkali cellulose;pressing the alkali cellulose;shredding the pressed cellulose;aging the shredded cellulose;reacting the aged cellulose with carbon disulphide to form cellulose xanthate;dissolving the cellulose xanthate to form viscose;ripening the viscose;filtering the ripened viscose to remove undissolved materials;degassing the filtered viscose;spinning the degassed viscose through a spinneret to form cellulose filaments;drawing the filaments to lengthen the cellulose chains;purifying the drawn filaments;cutting the purified filaments to form cellulose fibers; andpost-crosslinking by at least one of chemical or hydrothermal treatment;wherein for a dry crosslinking formation, the method includes adding a crosslinking agent to the pressing step, and for a wet crosslinking formation, the method includes adding the crosslinking agent to at least one of the dissolving and ripening steps.2. The ...

PRODUCTION OF MODIFIED PULP

A method for producing a modified lignocellulosic pulp having improved wet-strength properties and a modified lignocellulosic pulp obtainable by the method. 1. A method for producing a modified lignocellulosic pulp , comprising the steps:(i) providing a dry lignocellulo sic pulp, particularly a pulp having a dryness of at least about 85 weight-%;(ii) adding a dicarboxylic acid anhydride with a molecular weight of 220 g/mol or less to the dry pulp in an amount and under conditions to obtain a modified pulp having a negative surface charge of at least about 8 μmol/g based on the dry pulp weight; and(iii) beating the pulp from step (ii).2. The method of claim 1 , wherein in step (iii) the Schopper Riegler degree of the pulp is increased by at least 2° SR.3. The method of claim 2 , wherein in step (iii) the Schopper Riegler degree of the pulp is increased by up to 70° SR.4. The method of claim 1 , wherein the pulp has a Schopper Riegler degree of at least about 16° SR after step (iii).5. The method of claim 1 , wherein the modified pulp has increased wet-strength claim 1 , compared to an unmodified reference pulp claim 1 , particularly an increased wet tensile strength index claim 1 , e.g. a wet tensile strength index of at least 5 kNm/kg after beating when measured according to ISO 1924-3.6. The method of claim 1 , wherein the dicarboxylic acid anhydride is added in an amount of between about 1 kg to about 55 kg per ton pulp based on the dry pulp weight.7. The method of claim 1 , wherein a modified pulp having a relative negative surface charge from about 15% to about 40% is obtained.8. The method of claim 1 , wherein said pulp is an unbeaten pulp claim 1 , particularly selected from a kraft pulp claim 1 , or a sulfite pulp claim 1 , particularly selected from a softwood pulp claim 1 , or a hardwood pulp claim 1 , particularly a northern bleached softwood kraft (NBSK) pulp or a eucalyptus kraft pulp claim 1 , particularly an NBSK pulp.9. The method of claim 1 , wherein ...

MANUFACTURING METHOD OF CARBOXYMETHYL CELLULOSE NONWOVEN FABRIC AND USE OF CARBOXYMETHYL CELLULOSE NONWOVEN FABRIC MANUFACTURED THEREBY

The present invention relates to a manufacturing method of a carboxymethyl cellulose nonwoven fabric and the use of the carboxymethyl cellulose nonwoven fabric manufactured thereby. 1. A manufacturing method of a carboxymethyl cellulose nonwoven fabric , comprising the steps of:treating cellulose fibers chemically in a solvent to prepare carboxymethyl cellulose fibers;disentangling and mixing the carboxymethyl cellulose fibers in a paper-making solution comprising an alcohol solvent; andeliminating the solvent.2. The method as claimed in claim 1 , further comprising the step of performing a pressing process using calendaring after eliminating the solvent.3. The method as claimed in claim 1 , wherein the cellulose fibers are selected from the group consisting of viscos rayon fiber claim 1 , cotton fiber claim 1 , and Lyocell fiber.4. The method as claimed in claim 1 , wherein the carboxymethyl cellulose fibers have a length of 0.1 to 10 mm.5. The method as claimed in claim 1 , wherein the alcohol solvent is selected from the group consisting of ethanol claim 1 , methanol claim 1 , propanol claim 1 , and mixtures thereof.6. A medical nonwoven fabric for a water-absorption material using the carboxymethyl cellulose nonwoven fabric manufactured by the method of claim 1 , wherein the carboxymethyl cellulose nonwoven fabric is gelated upon contact with body fluid.7. The medical nonwoven fabric as claimed in claim 6 , wherein the water-absorption material is selected from the group consisting of an anti-adhesion barrier claim 6 , a wound dressing claim 6 , and a hemostatic dressing.8. The medical nonwoven fabric as claimed in claim 6 , wherein the carboxymethyl cellulose nonwoven fabric is dyed with a biocompatible dye or pigment.9. The medical nonwoven fabric as claimed in claim 6 , wherein the carboxymethyl cellulose nonwoven fabric is further coated with an antibacterial material.10. A mask pack using the carboxymethyl cellulose nonwoven fabric prepared by the method of ...

METAL-CONTAINING OXIDIZED CELLULOSE NANOFIBER DISPERSION AND METHOD OF PRODUCING THE SAME

Disclosed is a dispersion of metal-containing oxidized cellulose nanofibers with superior dispersibility, which is applicable to various uses. The disclosed metal-containing oxidized cellulose nanofiber dispersion comprises a dispersion medium, and metal-containing oxidized cellulose nanofibers containing a metal other than sodium in salt form, wherein the metal-containing oxidized cellulose nanofibers have a number-average fiber diameter of 100 nm or less. 1. A metal-containing oxidized cellulose nanofiber dispersion comprising:a dispersion medium; andmetal-containing oxidized cellulose nanofibers containing a metal other than sodium in salt form, whereinthe metal-containing oxidized cellulose nanofibers have a number-average fiber diameter of 100 nm or less.2. The metal-containing oxidized cellulose nanofiber dispersion of claim 1 , wherein the metal-containing oxidized cellulose nanofibers are metal-containing carboxylated cellulose nanofibers.3. The metal-containing oxidized cellulose nanofiber dispersion of claim 1 , wherein the metal-containing oxidized cellulose nanofibers have a number-average fiber length of 50 nm to 2 claim 1 ,000 nm.4. The metal-containing oxidized cellulose nanofiber dispersion of claim 1 , wherein the metal-containing oxidized cellulose nanofibers have an average degree of polymerization of 100 to 2 claim 1 ,000.5. The metal-containing oxidized cellulose nanofiber dispersion of claim 1 , wherein the metal other than sodium is at least one metal selected from the group consisting of metals of Group 2 to Group 14 in Period 3 to Period 6 of the long periodic table.6. The metal-containing oxidized cellulose nanofiber dispersion of claim 1 , wherein the metal other than sodium is at least one metal selected from the group consisting of magnesium claim 1 , aluminum claim 1 , calcium claim 1 , titanium claim 1 , chromium claim 1 , manganese claim 1 , iron claim 1 , cobalt claim 1 , nickel claim 1 , copper claim 1 , zinc claim 1 , silver claim ...

SUPER CLEAR CELLULOSE PAPER

Wood fibers possess natural unique hierarchical and mesoporous structures that enable a variety of new applications beyond their traditional use. For the first time we dramatically modulate the propagation of light through random network of wood fibers. A highly transparent and clear paper with transmittance >90% and haze <1.0% applicable for high-definition displays is achieved. By altering the morphology of the same wood fibers that form the paper, highly transparent and hazy paper targeted for other applications such as solar cell and anti-glare coating with transmittance >90% and haze >90% is also achieved. A thorough investigation of the relation between the mesoporous structure and the optical properties in transparent paper was conducted, including full-spectrum optical simulations. We demonstrate commercially competitive multi-touch touchscreen with clear paper as a replacement for plastic substrates, which shows excellent process compatibility and comparable device performance for commercial applications. Transparent cellulose paper with tunable optical properties is an emerging photonic material that will realize a range of much improved flexible electronics, photonics and optoelectronics. 1. A clear paper comprising:a transmittance greater than 90%; andan optical haze below 1%.2. A hazy paper comprising:a transmittance greater than 90%; andan optical haze above 90%.3. A touch screen with a grapheme film.4. A method of fabricating clear paper comprising: (i) passing 1.0 wt % TEMPO-oxidized wood pulp through z-shaped chambers;', '(ii) diluting cellulose nanofibers to 0.2 wt % with distilled water;', '(iii) stirring cellulose nanofiber suspension with a magnetic stirrer;', '(iv) centrifuging said cellulose nanofiber suspension at a speed of 3000 rpm/min; and', '(v) drying said cellulose nanofiber suspension in a controlled chamber., '(a) treating bleached softwood pulp with a TEMPO-oxidized system comprising5. A method of fabricating hazy paper comprising ...

SOFT, STRONG AND BULKY TISSUE

The disclosure provides tissue webs and products comprising cross-linked cellulosic fibers. In certain embodiments cross-linked cellulosic fibers are selectively disposed in one or more layers of a multi-layered tissue, wherein the tissue layer comprising cross-linked fibers is adjacent to a layer which is substantially free from cross-linked fiber. The cross-linked fibers may include hardwood kraft fibers reacted with a cross-linking agent selected from the group consisting of DMDHU, DMDHEU, DMU, DHEU, DMEU, and DMeDHEU. Tissue products and webs produced in this manner generally have improved sheet bulk, without losses in strength, compared to similar tissue products produced without cross-linked cellulosic fibers. As such the tissue products of the present invention generally have a basis weight from about 10 to about 50 gsm, a sheet bulk greater from about 8.0 to about 12.0 cc/g and geometric mean tensile from about 730 to about 1,500 g/3″. 1. A tissue product having a geometric mean tensile (GMT) from about 730 to about 1 ,200 g/3″ , a sheet bulk from about 8.0 to about 12.0 cc/g and a TS7 value less than about 10.0 , characterized in that the tissue product is creped and is not embossed.2. The tissue product of having a Slough less than about 10.0 mg.3. The tissue product of having a TS7 value from about 5.0 to about 9.0.4. The tissue product of having a Durability Index from about 26.0 to about 32.0.5. The tissue product of having a Stiffness Index from about 10.0 to about 13.0.6. The tissue product of comprising a first and a second ply and wherein the product comprises from about 30 to about 75 percent claim 1 , by weight of the product claim 1 , cross-linked hardwood kraft fibers.7. The tissue product of wherein the product comprises two multi-layered plies claim 1 , each ply comprising a first fibrous layer comprising cross-linked cellulosic fibers and wherein the product comprises from about 30 to about 75 percent claim 1 , by weight of the product claim ...

MODIFIED CELLULOSIC FIBERS HAVING REDUCED HYDROGEN BONDING

The present invention provides a modified cellulosic fiber having reduced hydrogen bonding capabilities. The modified fiber formed in accordance with the present invention may be useful in the production of tissue products having improved bulk and softness. More importantly, the modified fiber is adaptable to current tissue making processes and may be incorporated into a tissue product to improve bulk and softness without an unsatisfactory reduction in tensile. 1. A method of increasing the bulk of a tissue web comprising the steps of reacting cellulosic fiber with a cellulosic reactive reagent selected from the group consisting of reagents having the general Formula (I) and (II); treating the cellulosic fiber with a caustic agent; washing the cellulosic fiber; and forming a tissue web from the cellulosic fiber , wherein the tissue web has a basis weight greater than about 10 grams per square meter (gsm) and a sheet bulk greater than about 5 cc/g.2. The method of wherein the caustic agent is selected from the group consisting of hydroxide salts claim 1 , carbonate salts and alkaline phosphate salts.3. The method of wherein the water soluble agent is 2-(4 claim 1 ,6-dichloro-(1 claim 1 ,3 claim 1 ,5)-triazine-2 aminoyl) benzenesulfonic acid.4. The method of wherein the step of reacting cellulosic fiber and a cellulosic reactive reagent is carried out at a fiber consistency from about 5 to about 30 percent solids.5. The method of wherein the weight ratio of cellulosic fiber to cellulosic reactive reagent is from about 5:0.1 to about 5:1.6. The method of wherein the step of reacting cellulosic fiber and a cellulosic reactive reagent is carried out at a pH from about 7 to about 10 and at a temperature from about 0 to about 70° C.7. The method of wherein the cellulose fiber is either bleached northern softwood kraft pulp or bleached eucalyptus kraft pulp.8. The method of wherein the washed cellulosic fiber has a nitrogen content of at least about 0.2 weight percent.9. A ...

GRAFTED CROSSLINKED CELLULOSE USED IN ABSORBENT ARTICLES

Grafted, crosslinked cellulosic materials used in absorbent articles, the grafted crosslinked cellulosic materials including cellulose fibers and polymer chains composed of at least one monoethylenically unsaturated acid group-containing monomer (such as acrylic acid) grafted thereto, in which one or more of the cellulose fibers and the polymer chains are crosslinked (such as by intra-fiber chain-to-chain crosslinks). Some of such materials are characterized by a wet bulk of about 10.0-17.0 cm/g, an IPRP value of about 1000 to 7700 cm/MPa·sec, and/or a MAP of about 7.0 to 38 cm HO. Methods for producing such materials may include grafting polymer chains from a cellulosic substrate, followed by treating the grafted material with a crosslinking agent adapted to effect crosslinking of one or more of the cellulosic substrate or the polymer chains. 1. An absorbent article comprising a cellulosic material , the cellulosic material comprising a cellulose fiber and polymer chains composed of at least one monoethylenically unsaturated acid group-containing monomer grafted thereto , wherein , in one or more of the cellulose fiber , the polymer chains are intra-fiber crosslinked to the cellulose fiber.2. The absorbent article of claim 1 , wherein claim 1 , in the cellulosic material claim 1 , the at least one monoethylenically unsaturated acid group-containing monomer includes acrylic acid.3. The absorbent article of claim 1 , wherein claim 1 , in the cellulosic material claim 1 , the graft yield is from about 5% weight to about 35 weight %.4. The absorbent article of claim 1 , wherein claim 1 , in the cellulosic material claim 1 , the graft yield is from about 10% weight to about 20 weight %.5. The absorbent article of claim 1 , wherein the cellulosic material has a wet bulk at least about 6% greater than untreated cellulose fiber claim 1 , the untreated cellulose fiber being the same cellulosic fiber as the cellulosic fiber used for making the cellulosic material.6. The ...

FUNCTIONALIZED CELLULOSE FIBERS FOR DEWATERING AND ENERGY EFFICIENCY IMPROVEMENTS

The present disclosure provides methods of improving dewatering in the papermaking process by incorporation of functionalized cellulose fibers in the paper furnish. Additionally, the disclosure provides the means to eliminate process problems mainly plugging problems in a nano/micro-fibrillated cellulose production process by incorporation of functionalized cellulose fibers in a cellulose fiber composition and methods of functionalizing cellulose fibers in a paper making process. The methods according to the present disclosure provide several advantages, such as improving the freeness and dewatering of the paper making process during the paper making process, leading to an increased production rate and reduced energy consumption. 1. A method of functionalizing cellulose fibers in a paper making process , said method comprising the steps of:(a) obtaining a first plurality of cellulose fibers;(b) functionalizing the first plurality of cellulose fibers by subjecting the cellulose fibers to a process in which all or part of the surface of one or more of the first plurality of cellulose fibers is rendered hydrophobic;(c) optionally combining the first plurality of cellulose fibers with a second plurality of cellulose fibers, wherein the second plurality of cellulose fibers comprises non-functionalized cellulose fibers; and(d) utilizing the first plurality of cellulose fibers, and optionally the second plurality of cellulose fibers, in the paper making process.2. The method of claim 1 , wherein the combination of step (c) results in a cellulose fiber composition comprising between 5% and 95% of functionalized cellulose fibers and between 5% and 95% of non-functionalized cellulose fibers.3. The method of claim 1 , wherein the hydrophobic process is performed according to a process selected from the group consisting of a liquid phase silanization claim 1 , a gas phase silanization claim 1 , plasma deposition claim 1 , and an aqueous phase treatment scheme.4. The method of ...

METHOD FOR FIBRILLATION OF CELLULOSE AND FIBRIL CELLULOSE PRODUCT

A method for fibrillation of cellulose includes the following steps: introducing fibre pulp of anionic cellulose at a consistency of 1 to 4% into a homogenizer, and homogenizing fibre pulp in the homogenizer at a pressure of 200 to 1000 bar, advantageously 300 to 650 bar, and by using 2 to 4 passes through for the same fibre pulp under these conditions, and after passes through, taking pulp from the homogenizer, which pulp has been fibrillated by homogenization to a degree than can be expressed as Brookfield viscosity exceeding 10,000 mPa.s (consistency 0.8%, 10 rpm). 1. A method for fibrillation of cellulose , comprising the following steps:introducing fibre pulp of anionic cellulose at a consistency of 1 to 4% into a homogenizer, andhomogenizing said fibre pulp in the homogenizer at a pressure of 200 to 1000 bar, and by using 2 to 4 passes through for the same fibre pulp under these conditions, andafter said passes through, taking pulp from the homogenizer, which pulp has been fibrillated by homogenization to a degree than can be expressed as Brookfield viscosity exceeding 10,000 mPa.s at a measuring consistency of 0.8% and a rotation speed of 10 rpm.2. The method according to claim 1 , wherein the pulp has been fibrillated to a degree than can be expressed as Brookfield viscosity exceeding 15 claim 1 ,000 mPa.s at a measuring consistency of 0.8% and a rotation speed of 10 rpm.3. The method according to claim 1 , wherein the pulp has been fibrillated to a degree that can be expressed as turbidity in the range of 10 to 60 NTU claim 1 , measured by nephelometry at a consistency of 0.1 wt-% in an aqueous medium.4. The method according to claim 1 , wherein the anionic cellulose comprises carboxyl groups.5. The method according to claim 4 , wherein the anionic cellulose is oxidized cellulose.6. The method according to claim 5 , wherein the amount of carboxyl groups in the oxidized cellulose is 0.6 to 1.2 mmol/g.7. The method according to claim 4 , wherein the anionic ...

PULP, SLURRY, SHEET, LAMINATE, AND METHOD FOR PRODUCING PULP

It is an object of the present invention to optimize a bleaching process in a step of producing phosphorylated cellulose fibers. The present invention relates to a pulp comprising cellulose fibers having 0.5 mmol/g or more of phosphoric acid groups or phosphoric acid group-derived substituents, wherein when the pulp is processed into a sheet and four sheets are laminated on one another, the ISO whiteness of the laminate is 82% or more. Moreover, when the pulp of the present invention is processed into a sheet and four sheets are then laminated on one another, the b* value of the obtained laminate according to the L*a*b* color system is 5.5 or less. 1. A pulp comprising cellulose fibers having 0.5 mmol/g or more of phosphoric acid groups or phosphoric acid group-derived substituents , whereinwhen the pulp is processed into a sheet under the following condition A and four sheets are then laminated on one another, the ISO whiteness of the obtained laminate measured in accordance with JIS P 8148, with the exception that the test piece defined by JIS P 8148 is set to be the obtained laminate, is 82% or more:(Condition A){'sup': '2', 'ion exchange water is added to the pulp to prepare a suspension in which the concentration of the pulp comprising phosphorylated cellulose fibers is 0.3% by mass, and then, a wet sheet having an absolute dry basis weight of 200 g/mis formed from the suspension; the wet sheet is peeled off from a filter, is then placed on a stainless steel tray, and is then dried under conditions of 23° C. and a relative humidity of 50% for 3 days; and both surfaces of the dried sheet are sandwiched by papers and metal plates, and the sheet is then pressed by a pressure of 7.7 MPa for 1 minute to obtain a pulp sheet.'}2. The pulp according to claim 1 , wherein when the pulp is processed into a sheet under the condition A and four sheets are then laminated on one another claim 1 , the b* value of the obtained laminate according to the L*a*b* color system is 5. ...

Water treatment

The present invention concerns a process for removing ions from waste water, which process comprises providing plant-derived cationic nanofibrillar cellulose, carrying out a purification treatment comprising sorption of ions contained in the waste water to the plant-derived cationic nanofibrillar cellulose, separating used plant-derived cationic nanofibrillar cellulose from the waste water, and recovering treated waste water. The invention also concerns use of plant-derived cationic nanofibrillar cellulose in water treatment for removing charged contaminants.

WATER-DISPERSIBLE PAPER

The present invention provides a water-dispersible paper having improved dispersibility in seawater. A water-dispersible paper can have excellent dispersion solubility in seawater and the clogging of a filter by a water-dispersible paper can be reduced, by using an alkalized carboxyalkyl cellulose having a specific degree of etherification (DS) and a specific Runkel ratio. The water-dispersible paper comprises a base paper containing fibrous carboxyalkyl cellulose and papermaking fibers, wherein the content of the fibrous carboxyalkyl cellulose in the base paper is from 25 to 80% by weight, the fibrous carboxyalkyl cellulose is alkalized, the degree of etherification (DS) of the fibrous carboxyalkyl cellulose is from 0.40 to 0.63, and Runkel ratio of the fibrous carboxyalkyl cellulose is from 0.5 to 3.5. 1. A water-dispersible paper comprising a base paper containing fibrous carboxyalkyl cellulose and papermaking fibers , wherein the content of the fibrous carboxyalkyl cellulose in the base paper is from 25 to 80% by weight , the fibrous carboxyalkyl cellulose is alkalized , the degree of etherification (DS) of the fibrous carboxyalkyl cellulose is from 0.40 to 0.63 , and Runkel ratio of the fibrous carboxyalkyl cellulose is from 0.5 to 3.5.2. The water-dispersible paper of claim 1 , wherein the degree of etherification (DS) of the fibrous carboxyalkyl cellulose is from 0.45 to 0.60.3. The water-dispersible paper of claim 1 , wherein the fibrous carboxyalkyl cellulose is fibrous carboxymethyl cellulose.4. The water-dispersible paper of claim 1 , wherein the alkaline compound used for the alkalization is a hydroxide of an alkali metal or a salt of an alkali metal.5. A method for destroying the shape of an article or removing the article claim 1 , comprising a step of immersing the article in seawater or washing the article away with seawater claim 1 , wherein the article has a specific shape and is formed by using the water-dispersible paper of .6. The water- ...

PAPER PRODUCTS AND METHODS AND SYSTEMS FOR MANUFACTURING SUCH PRODUCTS

Methods of producing cellulosic or lignocellulosic materials for use in papermaking include treating a cellulosic or lignocellulosic dry feedstock having a first average molecular weight with ionizing radiation, and controlling the dose of ionizing radiation such that the average molecular weight of the feedstock is reduced to a predetermined level. A method of producing an irradiated paper product includes treating a paper product including a first carbohydrate-containing material having a first molecular weight with ionizing radiation, and controlling the dose of ionizing radiation so as to provide an irradiated paper product with a second carbohydrate-containing material having a second molecular weight higher than the first molecular weight. Pulp and paper products are produced. 1. A method of making a paper product , the method comprising:surface treating an irradiated cellulosic material with a coating or dye.2. A method of making a paper product , the method comprising:grafting a graft material onto grafting sites of a cellulosic material that has been irradiated to provide a functionalized cellulosic material having a plurality of grafting sites.3. The method of wherein the graft material comprises a reactive dye.4. A method of making a paper product claim 2 , the method comprising:irradiating a combination comprising a cellulosic material and a grafting agent in a manner that the grafting agent becomes bound to the cellulosic material.5. The method of wherein the grafting agent becomes covalently bound to the cellulosic material.6. A method of treating paper or a paper precursor claim 4 , the method comprising:directing positively charged ions to be incident on paper or a paper precursor, the positively charged ions having been provided by forming a plurality of negatively charged ions, accelerating the negatively charged ions to a first energy, removing a plurality of electrons from at least some of the negatively charged ions to form positively charged ...

SOFT TISSUE COMPRISING SOUTHERN SOFTWOOD

The present invention relates to soft, durable tissue products comprising Southern softwood fibers and more particularly low-coarseness Southern softwood fibers. The inventive tissue products generally comprise little or no Northern softwood kraft fibers yet have comparable or better tissue product properties such as a TS750 value (a measure of tissue softness) less than about 50 dB V2 rms and a CD Tear Index (a measurement of tissue durability) greater than about 13. 1. A tissue product having a TS750 value less than about 50 dB V2 rms and a CD Tear Index greater than about 13.2. The tissue product of having a Burst Index greater than about 7.5.3. The tissue product of having a CD TEA Index greater than about 6.5.4. The tissue product of having a Durability Index greater than about 28.5. The tissue product of wherein the TS750 value is from about 40 to about 45 dB V2 rms.6. The tissue product of having a GMT from about 600 to about 1000 g/3″.7. The tissue product of comprising at least about 5 percent claim 1 , by weight of the tissue product claim 1 , Southern softwood kraft fibers.8. The tissue product of wherein the Southern softwood kraft fibers have a coarseness less than about 21 mg/100 m and a fiber length greater than about 2.2 mm.9. The tissue product of wherein the tissue product comprises less than about 5 percent claim 1 , by weight of the tissue product claim 1 , NSWK fibers.10. The tissue product of wherein the tissue product is substantially free from NSWK fibers.11. A tissue product comprising at least one multi-layered through-air dried tissue web comprising a first and a second layer claim 1 , the second layer comprising low-coarseness SSWK fibers claim 1 , the tissue product having a Durability Index greater than about 28 and a TS750 value less than about 50 dB V2 rms.12. The tissue product of having a CD Tear Index greater than about 13.13. The tissue product of having a Burst Index greater than about 7.5.14. The tissue product of having a CD ...

PAPER FILLER COMPOSITION

A method for preparing an aqueous suspension may include providing a fibrous substrate comprising cellulose having a Canadian Standard freeness equal to or less than 700 cm, and microfibrillating the fibrous substrate in an aqueous environment by grinding in the presence of a grinding medium which is to be removed after completion of grinding. The grinding may be carried out in the absence of grindable inorganic particulate material, wherein the grinding medium is present in an amount of at least about 10% by volume of the aqueous environment, and wherein the microfibrillated cellulose has a fibre steepness of from about 20 to about 50. 199-. (canceled)100. A method for preparing an aqueous suspension comprising microfibrillated cellulose , the method comprising:{'sup': '3', 'providing a fibrous substrate comprising cellulose having a Canadian Standard freeness equal to or less than 700 cm;'}microfibrillating the fibrous substrate in an aqueous environment by grinding in the presence of a grinding medium which is to be removed after completion of grinding,wherein the grinding is carried out in the absence of grindable inorganic particulate material,wherein the grinding medium is present in an amount of at least about 10% by volume of the aqueous environment, andwherein the microfibrillated cellulose has a fibre steepness of from about 20 to about 50.101. A method according to claim 100 , wherein the grinding medium is present in an amount up to about 70% by volume of the aqueous environment.102. A method according to claim 100 , wherein the grinding medium comprises particles having an average diameter in ranging from about 0.5 mm to about 6 mm.103. A method according to claim 100 , wherein the grinding medium comprises particles having a specific gravity of at least about 2.5.104. A method according to claim 100 , wherein the fibrous substrate comprising cellulose is present in the aqueous environment at an initial solids content of at least about 5 wt %.105. A ...

METHOD FOR DEHYDRATING DISPERSION OF CHEMICALLY MODIFIED PULP

A method for dehydrating a dispersion of a chemically modified pulp (oxidized pulp, carboxymethylated pulp, or cationized pulp) obtained by chemically modifying a pulp feedstock, characterized by dehydrating the dispersion of a chemically modified pulp by means of a screw press. 1. A method for dehydrating a dispersion of a chemically modified pulp obtained by applying chemical modification treatment to a pulp raw material , the dispersion of the chemically modified pulp being dehydrated by a screw press.2. The method for dehydrating a dispersion of a chemically modified pulp according to claim 1 , wherein the chemically modified pulp has an amount of a carboxyl group of 0.6 mmol/g to 3.0 mmol/g based on a bone dry mass of the chemically modified pulp.3. The method for dehydrating a dispersion of a chemically modified pulp according to claim 1 , wherein the chemically modified pulp has a degree of carboxymethyl substitution of 0.01 to 0.50 per glucose unit of cellulose constituting the chemically modified pulp.4. The method for dehydrating a dispersion of a chemically modified pulp according to claim 1 , wherein the chemically modified pulp has a degree of cation substitution of 0.02 to 0.50 per glucose unit of cellulose constituting the chemically modified pulp.5. A process for producing a chemically modified pulp dehydrated product having a solid content of 5 to 30% by mass claim 1 , which comprises using the method for dehydrating according to .6. A process for producing a cellulose nanofiber claim 1 , which comprises using claim 1 , as a raw material claim 1 , a chemically modified pulp dehydrated product dehydrated by the method for dehydrating according to . The present invention relates to a method for dehydrating a dispersion of a chemically modified pulp.Various useful new materials and devices are expected to be provided from nanotechnology, which is a technology that freely controls substances in a nanometer region, that is, on the scale of atoms or ...

CELLULOSIC AND LIGNOCELLULOSIC STRUCTURAL MATERIALS AND METHODS AND SYSTEMS FOR MANUFACTURING SUCH MATERIALS

Methods of treating wood and wood products include irradiating untreated wood having a first molecular weight with ionizing radiation to cause an increase in the molecular weight of a cellulosic component of the wood to a second, relatively higher molecular weight. 1. A method of treating wood , the method comprising: irradiating wood that has been injected with a liquid comprising lignin , to produce wood comprising cross-linked lignin.2. The method of wherein the liquid is a solvent system in a single phase.3. The method of wherein the liquid is a solvent system with two or more phases.4. The method of claim 1 , wherein the liquid is a DMSO-salt solvent system.5. The method of claim 4 , wherein the salt of the DMSO-salt solvent system is a lithium salt claim 4 , a magnesium salt claim 4 , a potassium salt claim 4 , a sodium salt claim 4 , or a zinc salt.6. The method of claim 4 , wherein the DMSO-salt solvent system has a salt concentration of between 1 percent and 50 percent by weight.7. The method of claim 4 , wherein the DMSO-salt solvent system has a salt concentration of between 2 percent and 25 percent by weight.8. The method of claim 4 , wherein the DMSO-salt solvent system has a salt concentration of between 3 percent and 15 percent by weight.9. The method of claim 4 , wherein the DMSO-salt solvent system has a salt concentration of between 4 percent and 12.5 percent by weight.10. The method of further comprising adding an antistatic compound to the wood comprising cross-linked lignin.11. The method of wherein the antistatic compound is a conductive carbon black claim 10 , a carbon fiber claim 10 , a metal filler claim 10 , a quaternary ammonium compound claim 10 , an alkanolamide claim 10 , or an amine.12. The method of wherein the antistatic compound is N-(3-chloro-2-hydroxypropyl)-trimethylammonium chloride.13. The method of further comprising adding a degradable polymer to the wood comprising cross-linked lignin.14. The method of wherein the degradable ...

TISSUE PRODUCT COMPRISING BAMBOO

The disclosure provides tissue webs, and products incorporating the same, where the webs comprise wood and bamboo fibers. More specifically the disclosure provides soft and durable through-air dried tissue webs comprising at least about 10 percent bamboo fiber by weight of the web. In the through-air dried tissue webs of the present disclosure, bamboo typically replaces high average fiber length wood fibers, which increases the bulk of the through-air dried web without negatively effecting softness or durability. 1. A multi-layered , through-air dried , tissue web comprising a first fibrous layer and a second fibrous layer , the first fibrous layer comprising wood fibers and the second fibrous layer comprising bamboo fibers , wherein the first fibrous layer is substantially free of bamboo fibers and wherein the bamboo fibers comprise at least about 10 percent of the total weight of the web , the web having a GMT from about 600 to about 1 ,000 g/3″ , a basis weight from about 20 to about 45 gsm , and a bulk greater than about 10 cc/g.2. The tissue web of wherein the web comprises less than about 5 percent claim 1 , by weight of the web claim 1 , softwood fibers.3. The tissue web of wherein the second fibrous layer comprises from about 75 to about 100 percent bamboo fibers.4. The tissue web of wherein the first fibrous layer consists essentially of hardwood pulp fibers and the second fibrous layer comprises from about 80 to about 95 percent bamboo fibers.5. The tissue web of wherein the web has a Tear Index from about 7 to about 20.6. The tissue web of wherein the web has a Stiffness Index less than about 14.7. The tissue web of wherein the web has a Stiffness Index from about 5 to about 14 and a Burst Index greater than about 5.8. The tissue web of wherein the web has a Durability Index greater than about 20.9. The tissue web of wherein the web has a TEA Index greater than about 8.10. The tissue web of wherein the web has a Burst Index greater than about 5.11. A ...

COMPOSITION OF MATTER IN STOCK PREPARATION ZONE OF WET LAID PROCESS

A composition obtained by combining virgin cellulose fibers, cellulose ester (CE) staple fibers having a denier per filament (DPF) of less than 3, and water, and water. The CE staple fibers can also have a short cut length of less than 6 mm and can be crimped. The compositions, when co-refined, are useful to make wet laid products such as paper, cardboard, and filters that have improved water drainage, air permeability, tensile strength, bulk, burst strength, or stiffness, or a combination of these properties. 1. A composition obtained by combining:a. virgin cellulose fibers, b. cellulose ester (CE) staple fibers having a denier per filament (DPF) of less than 3 that are either dry, obtained from solvent spun filaments, or both, and the weight percent of CE staple fibers is less than 30 wt. %, based on the weight of CE staple fibers and said cellulose fibers; andc. water; (i) the weight of fibers in said Composition is more than 50 wt. % based on the weight of all solids made from polymers in said Composition or based on the weight of all solids in said Composition, or', '(ii) the CE staple fibers have an average length of less than 6 mm, or', '(iii) the CE staple fibers are non-round and crimped; or', '(iv) any combination of (i)-(iii)., 'wherein2. The composition of claim 1 , wherein the composition has a consistency of 10-50 wt. %.3. The composition of claim 1 , wherein the CE staple fibers have a cut length claim 1 , and the ratio of cut length to DPF is not more than 5:1.4. The composition of claim 1 , wherein no plasticizer is added to the composition.5. The composition of claim 1 , wherein the CE staple fibers and the filaments from which they are cut are not surface hydrolyzed.6. The composition of claim 1 , wherein not more than 1 wt. % of a surface hydrolyzing binder is added to the composition claim 1 , or the composition contains not more than 1 wt. % of a surface hydrolyzing binder claim 1 , or no surface hydrolyzing binder is added to or contained in ...

BROKE COMPOSITION OF MATTER

Broke pulp in a paper making process is obtained by pulping broke, and the broke pulp is made of fibrillated cellulose fibers and cellulose ester (CE) staple fibers having a denier per filament (DPF) of less than 3, or a cut length of less than 6 mm, or crimped, or non-round with a DPF of less than 3. The broke pulp can be added to the stock preparation zone of a wet laid manufacturing facility and fed through a refiner. 1. A composition comprising broke pulp , said broke pulp obtained by pulping broke , said broke pulp comprising fibrillated cellulose fibers and cellulose ester (CE) staple fibers , and water.2. The composition of claim 1 , wherein the cellulose fibers and CE staple fibers have been co-refined.3. The composition of claim 1 , wherein the weight ratio of CE staple fibers to all fibers in the broke pulp is within 30% of the weight ratio of the CE staple fibers to all fibers in the Composition.4. The composition of claim 1 , wherein the CE staple fibers have a target cut length of less than 6 mm claim 1 , and the ratio of cut length to DPF is not more than 5:1 claim 1 , or not more than 3:1 claim 1 , or nor more than 2.5:1.5. The composition of claim 1 , wherein no plasticizer is added to the composition claim 1 , or the composition contains no plasticizer or not more than 0.3 wt. % plasticizer claim 1 , or not more than 0.2 wt. % claim 1 , or not more than 0.1 wt. % claim 1 , or not more than 0.09 wt. % claim 1 , or not more than 0.07 wt. % claim 1 , or not more than 0.05 wt. % claim 1 , or not more than 0.03 wt. % claim 1 , or not more than 0.01 wt. % claim 1 , or not more than 0.007 wt. % claim 1 , or not more than 0.005 wt. % claim 1 , or not more than 0.003 wt. % claim 1 , or not more than 0.001 wt. % claim 1 , based on the weight of the CE staple fibers.6. The composition of claim 1 , wherein not more than 1 wt. % of a surface hydrolyzing binder is added to the composition claim 1 , or the composition contains not more than 1 wt. % of a surface ...

TISSUE PRODUCT COMPRISING CELLULOSE ACETATE

A tissue product is provided comprising a wet-laid sheet which comprises cellulosic fibers and cellulose ester staple fibers, wherein the cellulose ester staple fibers are present in an amount sufficient to provide the wet laid-sheet with a lower density and higher thickness at a given basis weight compared to a 100% Cellulose Comparative composition, when processed under similar conditions. The cellulose ester staple fibers can also provide the wet laid-sheet with a higher softness and/or higher water absorbance, compared to a 100% Cellulose Comparative composition, when processed under similar conditions. 1. A tissue product comprising a wet-laid sheet which comprises cellulosic fibers and cellulose ester staple fibers and has a basis weight of 20 gsm or less , wherein the cellulose ester staple fibers are present in an amount sufficient to provide the wet laid-sheet with a lower density and higher thickness at a given basis weight compared to a 100% Cellulose Comparative composition , when processed under similar conditions.2. The tissue product according to claim 1 , wherein the cellulose ester staple fiber has an average DPF of less than 3.0 and has an average cut length of less than 6 mm.3. The tissue product according to claim 2 , wherein the cellulose ester staple fiber is crimped and has an average of 5 CPI or more.4. The tissue product according to claim 3 , wherein the cellulose ester staple fiber has a multi-lobal cross-sectional shape.5. The tissue product according to claim 1 , wherein the cellulose ester staple fibers are present in an amount in the range from about 1 to 25 wt % claim 1 , based on the dry weight of the total fibers claim 1 , and wherein the cellulosic fibers and cellulose ester staple fibers are present in a combined amount of 50 wt. % or more claim 1 , based on the total dry weight of the wet-laid sheet.6. The tissue product according to claim 1 , wherein the cellulosic fibers and cellulose ester staple fibers are co-refined.7. The ...

A LOW VISCOSITY KRAFT FIBER HAVING AN ENHANCED CARBOXYL CONTENT AND METHODS OF MAKING AND USING THE SAME

A pulp fiber with an enhanced carboxyl content resulting in improved antimicrobial, anti-yellowing and absorptive properties. Methods for making the kraft pulp fiber and products made from it are also described. 1. A method of making an oxidized acid-treated kraft fiber comprising:subjecting cellulose fiber to a kraft pulping step;oxygen delignifying the cellulose fiber;bleaching the cellulose fiber using a multi-stage bleaching process;oxidizing the cellulose fiber with a peroxide and a catalyst under acidic conditions in at least one stage of the multi-stage bleaching process;treating the fiber with a carboxylating acid in at least one stage of the multi-stage bleaching process prior to the at least one oxidation stage; andtreating the fiber with a carboxylating acid in at least one stage of the multi-stage bleaching process following the at least one oxidation stage.2. The method of claim 1 , wherein the kappa number of the fiber after kraft pulping and oxygen delignification is from about 13 to about 21.3. The method of claim 1 , wherein the catalyst is chosen from at least one of copper and iron.4. The method of claim 1 , wherein the peroxide is hydrogen peroxide.5. The method of claim 4 , wherein the pH of the oxidation ranges from about 2 to about 6.6. The method of claim 5 , wherein the iron catalyst is chosen from at least one of ferrous sulfate claim 5 , ferrous chloride claim 5 , ferrous ammonium sulfate claim 5 , ferric chloride claim 5 , ferric ammonium sulfate claim 5 , or ferric ammonium citrate.7. The method of claim 6 , wherein the iron catalyst is added in an amount ranging from about 25 to about 150 ppm iron based on the dry weight of the kraft pulp.8. The method of claim 1 , wherein the multi-stage bleaching process is a five stage bleaching process.9. The method of any of claim 1 , wherein the multi-stage bleaching process is a five stage bleaching process comprising a sequence chosen from (C/A)(OX)(C/A)ED claim 1 , (C/A)(OX)DE(C/A) claim 1 , (C ...

MICROFIBROUS CELLULOSE-CONTAINING SUBSTANCE

A microfibrous cellulose aggregate containing microfibrous cellulose having an average fiber width of 2 nm to 50 nm and a liquid compound including at least one of water or an organic solvent. The content of the microfibrous cellulose is from 6 mass % to 80 mass % per the mass of the entire microfibrous cellulose aggregate, and the content of the liquid compound is at least 15 mass % per the mass of the entire microfibrous cellulose aggregate. 1. A method for manufacturing a microfibrous cellulose-containing substance , the method comprising:concentrating a first microfibrous cellulose dispersion liquid containing microfibrous cellulose having fibers with an average fiber width of 2 nm to 200 nm and a first dispersion medium wherein a surface charge of the microfibrous cellulose is positive,wherein the concentrating comprises flocculating the microfibrous cellulose contained in the first microfibrous cellulose dispersion liquid, and removing the first dispersion medium by filtering the first microfibrous cellulose dispersion liquid after the flocculating;wherein the microfibrous cellulose is flocculated by adding one selected from the group consisting of an alkali, sodium oleate, potassium oleate, sodium laurate, sodium dodecylbenzene sulfonate, sodium alkylnaphthalene sulfonate, sodium dialkyl sulfosuccinate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethlyene alkyl allyl ether sulfate, sodium polyoxyethylene dialkyl sulfate, polyoxyethylene alkyl ether phosphoric acid ester, polyoxyethylene alkyl allyl ether phosphoric acid ester, carboxymethylcellulose, carboxymethyl starch, and sodium alginate to the first microfibrous cellulose dispersion liquid.2. The method according to claim 1 , further comprising adding a cellulose plasticizer is further added to the first microfibrous cellulose dispersion liquid.3. The method according to claim 1 , wherein a microfibrous cellulose content of the first microfibrous cellulose dispersion liquid is less than 6 ...

Tissue with Nanofibrillar Cellulose Surface Layer

A method of making a tissue basesheet includes: (a) forming a nascent web from an aqueous furnish of papermaking fiber; (b) applying an aqueous composition of nanofibrillar cellulose to a surface of the nascent web; and (c) drying the nascent web to provide the tissue basesheet. Typically the basesheet is constructed with a tissue substrate of cellulosic papermaking fiber having applied to a surface thereof a layer of nanofibrillar cellulose, the tissue substrate having a basis weight of from 15 g/mto 30 g/mand the layer of nanofibrillar cellulose having a coatweight of from 0.25 g/mto 3 g/m. The product may be incorporated into 2-ply or 3-ply bath tissue. 1. A method of making a tissue basesheet comprising:(a) forming a nascent web from an aqueous furnish of papermaking fiber;(b) applying an aqueous composition of nanofibrillar cellulose to a surface of the nascent web; and(c) drying the nascent web to provide the tissue basesheet.2. The method according to claim 1 , wherein the aqueous composition of nanofibrillar cellulose is at a consistency of from 0.3% to 3%.3. The method according to claim 1 , wherein the aqueous composition of nanofibrillar cellulose is sprayed onto the nascent web.4. The method according to claim 1 , wherein the nascent web is dried on a Yankee dryer.5. The method according to claim 4 , wherein the aqueous composition of nanofibrillar cellulose is applied to the Yankee side of the nascent web.6. The method according to claim 4 , wherein the aqueous composition of nanofibrillar cellulose is applied to the air side of the nascent web.7. The method according to claim 1 , wherein the nascent web has from 15 g/mto 30 g/mpapermaking fiber.8. The method according to claim 1 , wherein the nanofibrillar cellulose is applied to the nascent web at a coatweight of from 0.25 g/mto 3 g/m.9. The method according to claim 1 , wherein the nanofibrillar cellulose is composed of cellulose nanofibers having a width of from 4 nanometers to 25 nanometers and a ...

METHOD FOR ENHANCED OXYGEN DELIGNIFICATION OF CHEMICAL WOOD PULPS

A method for producing a high yield Kraft pulp is provided. In particular, the method involves adding a composition comprising an organic amine phosphonate and a sulphonated linear alcohol ethoxylate surfactant to a pulping process. The composition enhances the delignification of cellulosic fiber in chemical wood pulps. 1. A method of producing a high yield Kraft pulp comprising:providing a Kraft pulp having a kappa number of at least about 30 for hardwood pulps or kappa numbers of at least about 40 for softwood pulps; treating the Kraft pulp with a composition comprising: a) an organic amine phosphonate; b) a magnesium salt; and c) one or more anionic linear alcohols and ethoxylates; and wherein the Kraft pulp is treated with the composition prior to an oxygen delignification process.2. The method according to claim 1 , wherein the anionic linear alcohols and ethoxylates is selected from the group consisting of sodium lauryl ether sulfate (SLES) claim 1 , sodium lauryl ether phosphate (SLEP) claim 1 , or sodium lauryl sulfate (SLS).3. The method according to claim 1 , wherein the organic amine phosphonate is selected from the group consisting of diethylenetriamine pentamethylene phosphonic acid (DTMP) claim 1 , aminotrismethylene phosphonate (ATMP) claim 1 , (Bis)hexamethylenetriamine pentamethylene phosphonic acid (BHMTPMP) claim 1 , and polyamino polyether methylenephosphonate (PAPEMP).4. The method according to claim 1 , wherein the magnesium salt is selected from the group consisting of a magnesium divalent cation Mg claim 1 , magnesium sulfate claim 1 , magnesium sulfate heptahydrate.5. The method according to claim 1 , wherein the oxygen delignification process is a 2-stage oxygen delignification process.65. The method according to claim 1 , wherein the temperature of the first stage of the 2-stage oxygen delignification process is from about 80 degrees Celsius (° C.) to about 100° C. and the temperature of the second stage is from about 90° C. to about 120° ...

Methods for Biodegradable Derivatization of Cellulosic Surfaces

The present invention describes methods of treating cellulosic materials with a composition that provides increased hydrophobicity to such materials without sacrificing the biodegradability thereof. The methods as disclosed provide for esterification of available hydroxyl groups on cellulosic materials, where such hydroxyl groups are “masked” by bulky organic chains, including that the disclosure provides products made by such methods. The materials thus treated display higher hydrophobicity, barrier function, and mechanical properties, and may be used in any application where such features are desired. 2. The method of claim 1 , wherein the surface of the solid cellulose-containing material exhibits greater hydrophobicity relative to the surface of the solid cellulose-containing material without said treating.3. The method of claim 1 , wherein the base is non-nucleophilic.4. The method of claim 3 , wherein the base is organic.5. The method of claim 4 , wherein the organic base is selected from the group consisting of aziridines claim 4 , azetidines claim 4 , piperazines claim 4 , piperidines claim 4 , pyridines claim 4 , bipyridines claim 4 , terpyridines claim 4 , dihydropyridines claim 4 , morpholines: N-alkylmorpholines claim 4 , 1 claim 4 ,4-diazabicyclo[2.2.2]octanes claim 4 , 1 claim 4 ,8-diazabicycloundecanes claim 4 , 1 claim 4 ,8-diazabicycloundecenes claim 4 , dimethylated pentylamines claim 4 , trimethylated pentylamines claim 4 , pyrimidines claim 4 , pyrroles claim 4 , pyrrolidines claim 4 , pyrrolidinones claim 4 , indoles claim 4 , indolines indanones claim 4 , benzindazones claim 4 , imidazoles claim 4 , benzimidazoles claim 4 , imidazolones claim 4 , imidazolines claim 4 , oxazoles claim 4 , isoxazoles claim 4 , oxazolines claim 4 , oxadiazoles claim 4 , thiadiazoles claim 4 , carbazoles claim 4 , quinolines claim 4 , isoquinolines claim 4 , naphthyridines claim 4 , triazines claim 4 , triazoles claim 4 , tetrazoles claim 4 , triethylamines claim 4 ...

CROSSLINKING CELLULOSE WITH GLYOXAL TO IMPROVE ABSORPTION PROPERTIES

The present invention is directed to a novel dialdehyde based reagent that is neutralized, wherein the preparation of the reagent includes the steps of provide a dialdehyde; provide a caustic soda; mix both reagents until pH of the dialdehyde is 5.5 to 7.5; and stir the mixture. 1. A dialdehyde based reagent , wherein the preparation of the reagent comprises:a. provide a dialdehyde in water,b. provide caustic soda;c. add caustic soda until pH of the dialdehyde is 5.5 to 7.5; andd. stir the mixture.2. The dialdehyde based reagent of claim 1 , wherein the reagent is suitable for making liquid surge fiber.3. The dialdehyde based reagent of claim 2 , wherein the surge fiber pulp is useful for use as a surge layer in an absorbent article.4. The dialdehyde based reagent of claim 1 , wherein the reagent is formed from reacting glyoxal compound and a sodium hydroxide compound.5. The dialdehyde based reagent of claim 4 , wherein the glyoxal compound is water soluble or form water soluble products when reacted with sodium hydroxide.6. The dialdehyde based reagent of claim 5 , wherein the dialdehyde is selected from glyoxal claim 5 , glutaraldehyde claim 5 , 1 claim 5 ,4-cyclohexane dicarbaldehyde claim 5 , and 1 claim 5 ,3-cyclohexane dicarbaldehyde claim 5 , and mixtures thereof.7. The dialdehyde based reagent of claim 1 , wherein the caustic soda is sodium hydroxide or potassium hydroxide.8. The dialdehyde glycol based reagent of claim 4 , wherein the reaction between dialdehyde and sodium hydroxide is carried at a temperature ranges from room temperature for at least 10 min.9. A method of making liquid surge fiber claim 1 , comprising: providing a solution of the dialdehyde based cross-linking reagent of ; diluting the solution; providing cellulosic fiber; applying the solution of the dialdehyde reagent to cellulosic fibers to impregnate the cellulosic based fibers; and drying the treated cellulosic fibers.10. The method of claim 9 , wherein the solution of the dialdehyde ...

Cellulose fibers, cellulose fiber-containing material, molded body, and method for producing cellulose fibers

The present invention is intended to enhance the transparency of a composition obtained using ultrafine cellulose fibers having phosphorous acid groups, while suppressing the yellowing of the ultrafine cellulose fibers. The present invention relates to cellulose fibers having a fiber width of 1000 nm or less and having a phosphorus oxoacid group or a phosphorus oxoacid group-derived substituent, wherein when a first amount of dissociated acid in the cellulose fibers is set to be A1 and a total amount of dissociated acid in the cellulose fibers is set to be A2, A1 is 1.35 mmol/g or more, and the value of A1/A2 is 0.51 or more, and when a sheet is formed under a predetermined condition, the YI value of the sheet is 6.0 or less.

PROCESS FOR PRODUCING MICROCRYSTALLINE CELLULOSE

A process for producing microcrystalline cellulose from fibrous cellulosic material by acid hydrolysis at an MCC plant. In this process a suspension of cellulosic pulp is thickened, so that filtrate is formed. A consistency of the thickened suspension is adjusted to 5-40% by adding dilution liquid, and the pH of the suspension is adjusted to a value of 4 or less with acid. The pulp suspension is subjected to acid hydrolysis of at least 120° C. in a reactor to produce a mixture of microcrystalline cellulose and hydrolysate. The mixture is discharged from the reactor to a lower pressure and lower temperature to flash the mixture and generate flash steam. Microcrystalline cellulose is separated from hydrolysate. The separated cellulose is washed in one or several washing apparatuses. The consistency of the microcrystalline cellulose is increased by thickening and/or drying for further processing. 1. A method for producing microcrystalline cellulose from fibrous cellulosic material by acid hydrolysis at a microcrystalline cellulose (MCC) plant , the method comprising:a) thickening a suspension of cellulosic material to form a filtrate,b) adding a dilution liquid to the thickened suspension of cellulosic material to adjust a consistency of the thickened suspension to a range of five to forty percent, and adding an acid to the thickened suspension to adjust a pH to no more than four of the thicken suspension,c) increasing a temperature of the thickened suspension to a range of 120 to 200° C.,d) subjecting the thickened suspension to acid hydrolysis a reactor while the thickened suspension is in the range of 120 to 200° C. to produce a mixture of microcrystalline cellulose and hydrolysate,e) flashing the mixture by discharging the mixture from the reactor to reduce the pressure and temperature of the mixture and generate flash steam,f) separating the mixture to separate the microcrystalline cellulose from the hydrolysate, and washing the separated microcrystalline ...

REDUCED FURFURAL CONTENT IN POLYACRYLIC ACID CROSSLINKED CELLULOSE FIBERS

Bleached polyacrylic acid crosslinked cellulose fibers with reduced furfural content are disclosed. The reduced furfural content is accompanied by a strong reduction of malodor associated with crosslinked fibers. Methods of furfural reduction include treatment with hydrogen peroxide in the absence of alkaline or other bleaching agents subsequent to curing polyacrylic acid crosslinked cellulose fibers. Some embodiments of treated polyacrylic acid crosslinked cellulose fibers have a furfural content lower than 1.3 ppm. In some embodiments, the reduction of furfural content of the treated crosslinked fibers compared to untreated crosslinked fibers is at least 55%. In some embodiments, furfural content decreases with aging of the treated crosslinked fibers. 1. A method of reducing the furfural content of polyacrylic acid crosslinked cellulosic fibers , the method comprising applying hydrogen peroxide alone , in a bleaching stage subsequent to a curing stage , to polyacrylic acid crosslinked cellulosic fibers in an amount of from about 0.1 to about 20 pounds (about 0.045 to about 9.07 kg) per ADMT of fiber and at a pH of between about 4.5 and 5 , wherein the amount of furfural in the treated crosslinked fibers reduces from a first value determined at least one day after the treatment of the crosslinked fibers to a second , subsequent value determined up to 21 days after treatment.2. The method of claim 1 , wherein hydrogen peroxide is applied to the fibers in an amount of from about 3.0 to about 10 pounds (about 1.36 to about 4.54 kg) per ADMT fiber.3. The method of claim 1 , wherein hydrogen peroxide is applied to the fibers in an amount of about 5 pounds (2.27 kg) per ADMT fiber.4. The method of claim 1 , wherein the hydrogen peroxide is applied by spraying the hydrogen peroxide alone into an air stream containing the crosslinked fibers.5. The method of claim 1 , wherein the reduction of furfural from the first value to the second value is at least about 25%.6. The ...

COMPOSITION, MATERIAL COMPRISING ULTRAFINE CELLULOSE FIBERS, AND METHOD FOR PRODUCING MATERIAL COMPRISING ULTRAFINE CELLULOSE FIBERS

An object of the invention is to provide a material or composition comprising ultrafine cellulose fibers having excellent fluidity. The invention relates to a composition comprising a particulate material comprising ultrafine cellulose fibers and water, and (B) a non-cellulose particulate material in which the water content of the composition is 2 to 94% by mass with respect to the total mass of the composition, and the content of (B) the non-cellulose particulate material is 0.1 to 12% by mass with respect to the total mass of the composition. The invention also relates to a method for producing the composition and a method for producing a material comprising ultrafine cellulose fibers. 1. A composition comprising:(A) a particulate material comprising ultrafine cellulose fibers and water, and 'wherein the water content of the composition is 2 to 94% by mass with respect to the total mass of the composition, and', '(B) a non-cellulose particulate material,'}the content of (B) the non-cellulose particulate material is 0.1 to 12% by mass with respect to the total mass of the composition.2. The composition according to claim 1 , wherein the content of the ultrafine cellulose fibers is larger than 5% by mass with respect to the total mass of the composition.3. The composition according to claim 1 , wherein the water content of the composition is 15 to 80% by mass with respect to the total mass of the composition.4. The composition according to claim 1 , wherein (B) the non-cellulose particulate material is an inorganic fine particle.5. The composition according to claim 1 , wherein (B) the non-cellulose particulate material is a hydrophobic inorganic fine particle.6. The composition according to claim 1 , wherein (B) the non-cellulose particulate material is a silica fine particle.7. The composition according to claim 1 , wherein (B) the non-cellulose particulate material is a hydrophobic silica fine particle.8. The composition according to claim 1 , wherein the ...

FINE CELLULOSE FIBER AND PRODUCTION METHOD FOR SAME

Provided is a method of producing fine cellulose fibers that are nanosized, that have a high crystallinity degree, and that are less vulnerable to fiber shape damage, the method including impregnating cellulose with a fibrillation solution to fibrillate the cellulose without mechanical crushing, and modifying the cellulose. The method of producing cellulose microfibrils of the present invention includes impregnating cellulose with a fibrillation solution containing a carboxylic acid vinyl ester or an aldehyde and an aprotic solvent having a donor number of 26 or more to fibrillate the cellulose. The aldehyde is at least one kind of aldehyde selected from the group consisting of an aldehyde represented by the following formula (1), paraformaldehyde, cinnamaldehyde, perillaldehyde, vanillin, and glyoxal: 1. A method of producing fine cellulose fibers , comprising impregnating cellulose with a fibrillation solution containing an aprotic solvent having a donor number of 26 or more and a carboxylic acid vinyl ester or an aldehyde to fibrillate the cellulose , {'br': None, 'sup': '1', 'R—CHO\u2003\u2003(1)'}, 'the aldehyde being at least one kind of aldehyde selected from the group consisting of an aldehyde represented by the following formula (1), paraformaldehyde, cinnamaldehyde, perillaldehyde, vanillin, and glyoxal{'sup': '1', 'where Rrepresents a hydrogen atom, an alkyl group having 1 to 16 carbon atoms, an alkenyl group, a cycloalkyl group, or an aryl group.'}2. The production method according to claim 1 , wherein a content of the carboxylic acid vinyl ester or the aldehyde is from 0.05 wt % to 50 wt % with respect to an entirety of the fibrillation solution.3. The production method according to claim 1 , wherein the aprotic solvent having a donor number of 26 or more is at least one kind selected from the group consisting of a sulfoxide claim 1 , a pyridine claim 1 , a pyrrolidone claim 1 , and an amide.4. The production method according to claim 1 , wherein the ...

CELLULOSIC AND LIGNOCELLULOSIC STRUCTURAL MATERIALS AND METHODS AND SYSTEMS FOR MANUFACTURING SUCH MATERIALS

Methods of treating wood and wood products include irradiating untreated wood having a first molecular weight with ionizing radiation to cause an increase in the molecular weight of a cellulosic component of the wood to a second, relatively higher molecular weight. 1. A method of processing wood to produce a finished product , the method comprising:debarking logs to produce debarked logs;sawing the debarked logs to produce sawn lumber;edging the sawn lumber to produce edged lumber;trimming the edged lumber to produce trimmed lumber;manufacturing the finished product from the trimmed lumber; andduring the method, irradiating one or more of the debarked logs, the sawn lumber, the edged lumber, the trimmed lumber and the finished product.2. The method of claim 1 , wherein irradiating is by ionizing radiation.3. The method of claim 1 , wherein irradiating is by ultraviolet rays.4. The method of claim 2 , wherein the ionizing radiation is X-rays.5. The method of claim 2 , wherein the ionizing radiation is electron beam radiation.6. The method of claim 2 , wherein the ionizing radiation is by particles heavier than electrons.7. The method of claim 5 , wherein the particles are positively charged.8. The method of claim 5 , wherein the particles are negatively charged.9. The method of claim 1 , further comprising quenching radicals in one or more of:debarked logs that have been irradiated, sawn lumber that has been irradiated, edged lumber that has been irradiated, and the finished product that has been irradiated.10. The method of claim 9 , wherein quenching radicals is by contact with a gas comprising nitrogen claim 9 , oxygen claim 9 , acetylene claim 9 , ethylene claim 9 , a chlorinated ethylene claim 9 , a chlorofluoroethylene claim 9 , or propylene.11. The method of claim 1 , wherein irradiating is from multiple directions.12. The method of further comprising drying the sawn lumber to a moisture content of 6 to 18 weight percent water.13. The method of further ...

POLYALKYLENE GLYCOL BASED REAGENT WITH ALDEHYDE END GROUPS SUITABLE FOR MAKING CELLULOSIC FIBERS WITH MODIFIED MORPHOLOGY

The present invention is directed to a novel polyalkylene glycol based reagent with aldehyde end groups, wherein the preparation of the reagent includes the steps of provide a polyalkylene glycol; provide an aldehyde compound; mix both reagents polyalkylene glycol and aldehyde in 1:2 equivalent; stir the mixture for a certain period of time until a clear solution is obtained, and dilute with water to a desirable concentration. 1. A polyalkylene glycol based reagent with aldehyde end groups , wherein the preparation of the reagent comprises:a. provide a polyalkylene glycol;b. provide an aldehyde compound;c. mix both reagents polyalkylene glycol and aldehyde in 1:2 equivalent;d. stir the mixture for a certain period of time until a clear solution is obtained, ande. dilute with water to a desirable concentration.2. The polyalkylene glycol based reagent of claim 1 , wherein the reagent is suitable for making liquid transfer fiber.3. The polyalkylene glycol based reagent of claim 2 , wherein the transfer pulp is useful for use as a surge layer in an absorbent article.4. The polyalkylene glycol based reagent of claim 1 , wherein the reagent composed of a polymeric backbone and an end group.5. The polyalkylene glycol based reagent of claim 1 , wherein the polymeric backbone is a polyalkylene oxide and the end group is an aldehyde.6. The polyalkylene glycol based reagent of claim 1 , wherein the reagent is formed from reacting polyalkylene glycol compound and a dialdehyde compound.7. The polyalkylene glycol based reagent of claim 6 , wherein the polyalkylene glycol compound is water soluble or form water soluble products when reacted with the dialdehyde.8. The polyalkylene glycol based reagent of claim 6 , wherein the polyalkylene glycol has the molecular formula R′O—(R—O)R′ where n could be anywhere from 6 to 2000 claim 6 , R ethyl claim 6 , isopropyl or butyl and R′ is H or a glycidyl group.9. The polyalkylene glycol based reagent of claim 8 , wherein the polyalkylene ...

METHOD FOR PRODUCTION OF FILLER LOADED SURFACE ENHANCED PULP FIBERS

The present invention relates to a method for preparing loaded paper pulp for use in the manufacture of paper or paper board. At least one process stream containing a plurality of unrefined pulp fibers and at least one process stream of at least one filler are combined in a refiner to form a loaded paper pulp composition having a plurality of surface enhanced pulp fibers that are loaded with particles of the at least one filler. 1. A method for manufacture of a loaded paper pulp composition for use in the manufacture of paper products , comprising:introducing a first process stream containing a plurality of unrefined pulp fibers into a refiner, introducing a second process stream of containing at least one filler into the refiner; andrefining the at least one filler and the plurality of unrefined pulp fibers in the refiner until an energy consumption of at least 300 kWh/ton is reached to form a loaded paper pulp composition comprising a plurality of surface enhanced pulp fibers that are loaded with particles of the at least one filler.2. The method of claim 1 , wherein the at least one filler is a plurality of crystals of calcium carbonate claim 1 , CaCO3 (PCC) claim 1 , that are directly entangled therein the plurality of surface enhanced pulp fibers.3. The method of claim 2 , wherein the plurality of crystals are directly entangled therein the plurality of surface enhanced pulp fibers by mechanical bonding.4. The method of claim 3 , wherein the plurality of crystals are directly entangled therein the plurality of surface enhanced pulp fibers without binders or retention aids present at the interface between the plurality of crystals of calcium carbonate and the plurality of surface enhanced pulp fibers.5. The method of claim 1 , wherein the plurality of crystals of calcium carbonate have an average particle size of between about 0.2 micron to 3.0 micron.6. The method of claim 1 , wherein the ratio of the plurality of surface enhanced pulp fibers to at least one ...

OXYGEN TREATMENT OF WATER AND PULP FROM PAPER OR CARDBOARD PRODUCTION

Methods for seating water and gulp used in a paper or cardboard manufacturing process. Oxygen and nutrients are added to the water or pulp to increase the activity of aerobic bacteria resulting in a reduction of organic substances such as fatty acids. Alternatively oxygen alone is added to the water or pulp to reduce all both aerobic and anaerobic bacterial activity. 1. A method of treating water or pulp from a paper or cardboard manufacturing process wherein the water or pulp contains both aerobic and anaerobic bacteria , the method comprising the steps of:a) adding pure oxygen into the water or pulp andb) adding nitrogen or phosphorus containing nutrients into the water or pulp.2. The method of wherein the nutrient is urea.3. The method of wherein the nutrient is phosphoric acid.4. The method of wherein the addition of oxygen to the water or pulp raises the dissolved oxygen concentration in the water or pulp to between 15 mg/l and 20 mg/l.5. The method of wherein the ratio of COD:N:P wherein COD is chemical oxygen demand claim 1 , N is nitrogen containing nutrients and P is phosphorus containing nutrients claim 1 , is raised to between 100:5:1 per weight and 250:5:1 per weight.6. The method of wherein the method is applied to recirculated water or water storage tanks.7. A method of controlling the levels of aerobic and anaerobic bacteria in water or pulp from a paper or cardboard manufacturing process wherein the water or pulp contains both aerobic and anaerobic bacteria claim 1 , the method comprising the steps of:a) adding pure oxygen to the water or pulp andb) adding nitrogen or phosphorus containing nutrients into the water or pulp.8. The method of wherein growth of the aerobic bacteria is increased and growth of the anaerobic bacteria is inhibited.9. The method of Wherein the addition of oxygen to the water or pulp raises the dissolved oxygen concentration in the water or pulp to between 15 mg/l and 20 mg/l.10. The method of wherein the method is applied to ...

A LOW VISCOSITY KRAFT FIBER HAVING AN ENHANCED CARBOXYL CONTENT AND METHODS OF MAKING AND USING THE SAME

A pulp fiber with an enhanced carboxyl content resulting in improved antimicrobial, anti-yellowing and absorptive properties. Methods for making the kraft pulp fiber and products made from it are also described. 1. A method of making an oxidized acid-treated kraft fiber comprising:subjecting cellulose fiber to a kraft pulping step;oxygen delignifying the cellulose fiber;bleaching the cellulose fiber using a multi-stage bleaching process;oxidizing the cellulose fiber with a peroxide and a catalyst under acidic conditions in at least one stage of the multi-stage bleaching process;treating the fiber with a carboxylating acid in at least one stage of the multi-stage bleaching process prior to the at least one oxidation stage; andtreating the fiber with a carboxylating acid in at least one stage of the multi-stage bleaching process following the at least one oxidation stage.2. The method of claim 1 , wherein the kappa number of the fiber after kraft pulping and oxygen delignification is from about 13 to about 21.3. The method of claim 1 , wherein the catalyst is chosen from at least one of copper and iron.4. The method of claim 1 , wherein the peroxide is hydrogen peroxide.5. The method of claim 4 , wherein the pH of the oxidation ranges from about 2 to about 6.6. The method of claim 5 , wherein the iron catalyst is chosen from at least one of ferrous sulfate claim 5 , ferrous chloride claim 5 , ferrous ammonium sulfate claim 5 , ferric chloride claim 5 , ferric ammonium sulfate claim 5 , or ferric ammonium citrate.7. The method of claim 6 , wherein the iron catalyst is added in an amount ranging from about 25 to about 150 ppm iron based on the dry weight of the kraft pulp.8. The method of claim 1 , wherein the multi-stage bleaching process is a five stage bleaching process.9. The method of any of claim 1 , wherein the multi-stage bleaching process is a five stage bleaching process comprising a sequence chosen from (C/A)(OX)(C/A)ED claim 1 , (C/A)(OX)DE(C/A) claim 1 , (C ...

SULFONATED PULP FIBERS, DERIVATIVE PULP, SULFONATED FINE CELLULOSE FIBERS, METHOD FOR PRODUCING SULFONATED FINE CELLULOSE FIBERS, AND METHOD FOR PRODUCING SULFONATED PULP FIBERS

[Object] An object is to provide a sulfonated fine cellulose fiber having excellent transparency, a sulfonated pulp fiber suitable for the sulfonated fine cellulose fiber, a method for producing these fibers, and a derivative pulp containing the sulfonated pulp fiber. 1. A sulfonated pulp fiber , which is a pulp fiber , comprising:a plurality of cellulose fibers,a part of hydroxyl groups of the cellulose fibers of the pulp fiber being substituted with sulfo groups,an introduction amount of sulfur attributable to the sulfo groups being adjusted to be higher than 0.42 mmol/g while maintaining a fiber shape, anda water retention value of the pulp fiber being adjusted to 150% or more.2. The sulfonated pulp fiber according to claim 1 , wherein the water retention value of the pulp fiber is adjusted to 200% or more.3. The sulfonated pulp fiber according to claim 1 , wherein the water retention value of the pulp fiber is adjusted to 900% or more.4. The sulfonated pulp fiber according to claim 1 , whereinan average fiber length of the pulp fiber is adjusted to 50% or more relative to an average fiber length of the pulp fiber before substitution with sulfo groups.5. The sulfonated pulp fiber according to claim 1 , wherein the pulp fiber after washing and drying has a whiteness of 30% or more.6. The sulfonated pulp fiber according to claim 1 , whereinthe hydroxyl group at C6 position of a glucose unit constituting the cellulose fibers is substituted with the sulfo group.7. A sulfonated pulp fiber produced claim 1 , which is produced by a method claim 1 , comprising:bringing a sulfonating agent having sulfo groups and urea and/or a derivative thereof into contact with a pulp fiber constituting pulp, andintroducing sulfo groups into a part of hydroxyl groups of the cellulose fibers constituting the pulp fiber after the contact,an introduction amount of sulfur attributable to the sulfo groups being adjusted to be higher than 0.42 mmol/g, and a water retention value of the pulp ...

PROCESS FOR PRODUCING DIFFERENTIATED CELLULOSE FIBERS COMPRISING AN ENZYMATIC TREATMENT IN ASSOCIATION WITH AN ACID STEP

The present invention refers to a process for producing cellulose of market eucalyptus fibers having distinct features through the use of at least one enzymatic treatment with hydrolytic enzymes, such as for example, xylanases, cellulases or mixtures thereof, in association to at least one acidic treatment step. These treatments may be applied into different steps of the fibers process producing, wherein all of them happen before drying. 1. A process for producing cellulose fibers , characterized by comprising the association of at least one enzymatic treatment with at least one acid step throughout the process for obtaining cellulose fibers.2. The process according to claim 1 , characterized in that the enzymatic treatment uses at least one hydrolytic enzyme.3. The process according to claim 2 , characterized in that the hydrolytic enzyme is selected from the group consisting of cellulases claim 2 , xylanases and mixtures thereof.4. The process according to any one of to claim 2 , characterized in that the retention time ranges from 40 to 240 minutes claim 2 , the pH of the medium ranges from 5.5 to 8.5 and medium temperature ranges from 40 to 90° C. claim 2 , and hydrolytic enzyme charge ranges from 0.10 to 2.0 kilogram of enzyme/ton cellulose.5. The process according to any one of to claim 2 , characterized in that medium temperature during the enzymatic treatment ranges from 50 to 90° C. when the hydrolytic enzyme is xylanase.6. The process according to any one of to claim 2 , characterized in that medium temperature during the enzymatic treatment ranges from 40 to 80° C. when the hydrolytic enzyme is cellulase.7. The process according to any one of to claim 2 , characterized in that medium temperature during the enzymatic treatment ranges from 40 to 80° C. when the hydrolytic enzyme is a mixture of xylanases and cellulases.8. The process according to any one of to claim 2 , characterized in that the enzymatic treatment is applied before the bleaching sequence ...

LACCASES FOR BIO-BLEACHING

Provided herein are isolated laccase enzymes and nucleic acids encoding them. Also provided are mediators for laccase reactions. Also provided herein are methods for using laccases to oxidize lignins and other phenolic and aromatic compounds, such as for bio-bleaching and decolorization of wood pulp under high temperature and pH conditions to facilitate a substantial reduction in use of bleaching chemicals, as well as for treatment of fibers. 1. An isolated polypeptide , comprising: an amino acid sequence having at least 80% sequence identity to the amino acid sequence of SEQ ID NO: 4 , wherein said isolated polypeptide comprises laccase activity , oxidizes lignin under conditions of pH greater than or equal to pH 8.0 , and retains laccase activity for greater than at least about 5 minutes at greater than or equal to 60° C.2. The isolated polypeptide of claim 1 , wherein said polypeptide comprises an amino acid sequence that is at least 90% identical to the sequence of SEQ ID NO: 4.3. The isolated polypeptide of claim 1 , wherein said polypeptide comprises an amino acid sequence that is at least 95% identical to the sequence of SEQ ID NO: 4.4. The isolated polypeptide of claim 1 , wherein said polypeptide comprises an amino acid sequence that is at least 97% identical to the sequence of SEQ ID NO: 4.5. The isolated polypeptide of claim 1 , wherein said polypeptide comprises an amino acid sequence that is at least 99% identical to the sequence of SEQ ID NO: 4.6. The isolated polypeptide of claim 1 , wherein said polypeptide comprises the amino acid sequence of SEQ ID NO: 4.76. The isolated polypeptide of any one of - comprising at least one amino acid substitution claims 3 , wherein the position of the at least one substitution in SEQ ID NO: 4 is selected from the group consisting of amino acid residue 162 claims 3 , 163 claims 3 , 164 claims 3 , 166 claims 3 , 168 claims 3 , 169 claims 3 , 170 claims 3 , 171 claims 3 , 172 claims 3 , 173 claims 3 , 174 claims 3 , ...

METHOD FOR MAKING NANOFIBRILLAR CELLULOSE AND FOR MAKING A PAPER PRODUCT

A method for making nanofibrillar cellulose includes mixing anionized or cationized cellulose fibers and cellulose pulp to a mixture including at least 1% and below 90 wt-% cellulose pulp based on dry weight, and subjecting the mixture to a refiner stage where the anionized or cationized cellulose fibers are at least partly reduced to nanofibrillar cellulose and the cellulose pulp acts as auxiliary pulp, and obtaining a mixture of nanofibrillar cellulose and cellulose pulp from the refining stage. The mixture can be used for making paper by adding it to base pulp. 1. A method for making nanofibrillar cellulose , comprisingmixing anionized or cationized cellulose fibers and cellulose pulp to a mixture comprising at least 1% and below 90 wt-% cellulose pulp based on dry weight, andsubjecting the mixture to a refiner stage where the anionized or cationized cellulose fibers are at least partly reduced to nanofibrillar cellulose and the cellulose pulp acts as auxiliary pulp, andobtaining a mixture of nanofibrillar cellulose and cellulose pulp from the refining stage.2. The method according to claim 1 , wherein the amount of anionized fibers is above 10 wt-% and 60 wt-% at the most.3. The method according to claim 1 , wherein in the refining stage the mixture of anionized or cationized cellulose fibers and cellulose pulp is passed several times through the refiner.4. The method according to claim 1 , wherein the anionized cellulose is oxidized cellulose comprising carboxylate groups claim 1 , or carboxymethylated cellulose.5. The method according to claim 1 , wherein the cellulose pulp comprises chemical pulp.6. The method according to claim 1 , wherein after the refining stage claim 1 , the mixture of nanofibrillar cellulose and cellulose pulp is combined with additional pulp.7. The method according to claim 6 , wherein the mixture of nanofibrillar cellulose and cellulose pulp is supplied to the flow of additional pulp.8. The method according to claim 6 , wherein paper ...

FINE CELLULOSE FIBER-CONTAINING SUBSTANCE, METHOD FOR MANUFACTURING THE SAME, AND FINE CELLULOSE FIBER DISPERSION

A fine cellulose fiber-containing substance that has excellent dispersibility in water and can be manufactured easily. A method is for manufacturing the fine cellulose fiber-containing substance, and a method is for manufacturing a fine cellulose fiber dispersion. A fine cellulose fiber-containing substance contains fine cellulose fibers into which a phosphite containing a cation of an inorganic substance is introduced. The ratio of the cation of the inorganic substance with respect to 1 g of the fine cellulose fibers is 0.14 mmol or more. In manufacturing the fine cellulose fiber-containing substance, a phosphite is introduced into cellulose fibers, and then the cellulose fibers are defibrated to obtain a dispersion containing fine cellulose fibers, during which an alkali metal ion-containing substance is added to the cellulose fibers, and the dispersion is concentrated. In manufacturing a fine cellulose fiber dispersion, the fine cellulose fiber-containing substance is mixed with water. 1. A fine cellulose fiber-containing substance comprising fine cellulose fibers into which a phosphite containing a cation of an inorganic substance is introduced ,wherein a ratio of the cation of the inorganic substance with respect to 1 g of the fine cellulose fibers is 0.14 mmol or more.3. The fine cellulose fiber-containing substance according to claim 1 , wherein the cation of the inorganic substance is an alkali metal ion or an alkaline earth metal ion.4. The fine cellulose fiber-containing substance according to claim 1 , having a moisture content of less than 90% by mass.5. A method for manufacturing a fine cellulose fiber-containing substance claim 1 , the method comprising:introducing a phosphite into cellulose fibers, and then defibrating the cellulose fibers to obtain a dispersion containing fine cellulose fibers, during which an alkali metal ion-containing substance is added to the cellulose fibers; andconcentrating the dispersion to obtain a fine cellulose fiber- ...

WOOD PULP TREATMENT

A process using a multicomponent enzyme preparation to treat screened once refined pulps and reduces the specific energy consumption and/or increasing production while maintaining or increasing handsheet physical properties. The enzyme preparation has a major endoglucanase activity, a significant mannanase activity and a relatively small cellobiohydrolase activity. This enzyme mixture is prepared from a genetically modified strain of 1. A method of manufacturing a wood pulp , the method comprising:exposing a mechanical wood pulp to an enzymatic solution comprising an endoglucanase (EG) and a cellbiohydrolase (CBH), wherein the ratio of enzymatic activity of EG:CBH is at least 3, for a sufficient amount of time to reduce energy consumption during subsequent refining of the exposed pulp in which the freeness of the pulp (CSF) is reduced by at least 10% in comparison to the freeness of the same pulp which has not been exposed to the enzymatic solution while at least maintaining the tensile strength of a handsheet produced from said subsequently refined pulp in comparison with a handsheet produced from the same pulp which has not been exposed to the enzymatic solution, the tensile strength being determined according to TAPPI standard T 205 sp-06.2. The method of claim 1 , wherein said reduction in energy consumption is at least 5%.3. The method of claim 2 , wherein said reduction in energy consumption is at least 10%.4. The method of claim 2 , wherein the step of exposing the mechanical wood pulp comprises exposing a mechanical wood pulp having a CSF of greater than 650 ml to the enzymatic solution for a sufficient time to reduce the drainability to less than 150.5. The method of claim 4 , wherein the enzymatic activity of the EG is in the range of 0.5 to 25 CMCU per gm of the long-fiber fraction of the pulp based on dry weight measured according to standard T 258 om-06.6. The method of claim 5 , wherein the enzymatic solution further comprises a hemicellulase having ...

TISSUE PAPER COMPRISING PULP FIBERS ORIGINATING FROM MISCANTHUS AND METHOD FOR MANUFACTURING THE SAME

A tissue paper web composed of one or more layers. At least one layer includes pulp fibers originating from at least one plant belonging to the genus wherein the pulp fibers are selected from chemical pulp fibers, mechanical pulp fibers subjected to a chemical pretreatment and mixtures thereof. The use of pulp fibers can lead to a major absolute increase in tensile strength along with good softness values. 1Miscanthus. A tissue paper web composed of one or more layers , wherein at least one layer comprises pulp fibers originating from at least one plant belonging to the genus , wherein the pulp fibers are selected from the group consisting of chemical pulp fibers , mechanical pulp fibers subjected to a chemical pretreatment , and mixtures thereof.2Miscanthus Gigantheus, Miscanthus SinensisMiscanthus Sacchariflorus.. The tissue paper web according to claim 1 , wherein the pulp fibers originate from claim 1 , or3Miscanthus. The tissue paper web according to claim 1 , wherein the pulp fibers claim 1 , which originate from at least one plant belonging to the genus claim 1 , are present in an amount of at least 5 wt.-% claim 1 , based on the total weight of the tissue paper web.4Miscanthus.. The tissue paper web according to claim 1 , wherein the web is composed of two or three layers made from different pulps wherein at least one of these layers is made from pulp comprising the pulp fibers originating from at least one plant belonging to the genus5. The tissue paper web according to claim 1 , wherein the remaining fibers present in said tissue paper web are selected from pulp fibers comprising hardwood fibers claim 1 , softwood fibers or non-wood fibers.6. The tissue paper web according to claim 4 , wherein the web is composed of two layers wherein:{'i': Miscanthus', 'Miscanthus, '(i) the first layer is made from pulp fibers (i-a) consisting of fibers originating from at least one plant belonging to the genus , and optionally hardwood fibers, or from pulp fibers (i-b) ...

SURFACE MODIFIED CELLULOSE FIBER

A process for producing surface modified bleached chemical pulp fiber comprising fluidizing the bleached chemical pulp fiber and contacting the fluidized bleached chemical pulp fiber with an aerosol of a surface modifying composition comprising a surface modifying compound 1. A process for producing surface modified bleached chemical pulp fiber comprising fluidizing a bleached chemical pulp fiber and contacting the fluidized bleached chemical pulp fiber with an aerosol of a surface modifying composition comprising a surface modifying compound.2. The process for producing surface modified bleached chemical pulp fiber according to claim 1 , wherein the aerosol comprises liquid particles of surface modifying composition.3. The process for producing surface modified bleached chemical pulp fiber according to claim 1 , wherein the bleached chemical pulp fiber is modified with an amount of 0.1-10 wt % of surface modifying compound with respect to the weight of the bleached chemical pulp fiber.4. The process for producing surface modified bleached chemical pulp fiber according to claim 1 , wherein the surface modifying composition comprises a dicarboxylic alkenoic anhydride grafted polyolefin as the surface modifying compound.5. The process for producing surface modified bleached chemical pulp fiber according to claim 1 , wherein the surface modifying composition is an aqueous dispersion of the dicarboxylic alkenoic acid anhydride grafted polyolefin.6. The process for producing surface modified bleached chemical pulp fiber according to claim 1 , wherein the surface modifying composition comprises claim 1 , or consists of claim 1 , a silane or a salt of said silane claim 1 , according to formula I{'br': None, 'sub': 1', 'n', '2', '4-n, '(R)Si(R),\u2003\u2003(I)'}{'sub': 1', '2, 'as the surface modifying compound, where Ris a group capable of undergoing hydrolysis, where n is a integer chosen from 1, 2 or 3, where Ris independently a hydrogen, methyl, ethyl or a alkyl chain ...

SPECIALTY PULP WITH HIGH INTRINSIC VISCOSITY

A method for making a specialty fiber by activating pulp in an alkaline aqueous medium, then reacting it a water-soluble, multi-functional reagent able to bridge neighboring cellulose chain within a single fiber. The resultant specialty cellulose fibers have high intrinsic viscosity and may be used to make cellulose ethers, cellulose acetate, and viscose. 1. A specialty pulp , comprising:a plurality of cellulose chains which are crosslinked within a single fiber by a hydrophilic bridging agent having at least two epoxy groups,wherein the specialty pulp has at least 20% greater intrinsic viscosity than the noncrosslinked pulp.2. The specialty pulp according to claim 1 , wherein the bridging agent is selected from the group consisting of diglycidyl ether; ethylene glycol diglycidyl ether; glycerol diglycidyl ether; 1 claim 1 ,2-Propanediol diglycidyl ether; 1 claim 1 ,4-Butanediyl diglycidyl ether; polyethylene glycol diglycidyl ether; propylene glycol glycidyl ether; polypropylene glycol diglycidyl ether; 1 claim 1 ,4-cyclohexanoldimethanol diglycidyl ether; 1 claim 1 ,2-cyclohexanoldimethanol diglycidyl ether claim 1 , diglycidyl 1 claim 1 ,2-cyclohexanedicarboxylate; resorcinol diglycidyl ether; 4 claim 1 ,4′-Methylenebis(N claim 1 ,N-diglycidylaniline); N claim 1 ,N-diglycidyl aniline claim 1 , N claim 1 ,N-diglcidy 1-4-glycidyloxyaniline; diglycidyl 1 claim 1 ,2 claim 1 ,3 claim 1 ,4-tetrahydrophthalate claim 1 , 1 claim 1 ,2-dicarboxylic acid diglycidyl ester claim 1 , or a mixture thereof. The present invention relates to methods of making specialty pulp having high intrinsic viscosity, suitable for use in making value-added polymers such as cellulose ether, cellulose acetate, and viscose.Cellulose is a naturally occurring linear homopolymer that exists in a fibrous form in plants. Chemically, it consists of the anhydroglucose repeat units connected through 1,4-β-glycosidic linkages. Each anhydroglucose unit has three hydroxyl groups—two secondary and one ...

A METHOD OF PRODUCING OXIDIZED OR MICROFIBRILLATED CELLULOSE

The invention relates to a method of producing oxidized or microfibrillated cellulose (MFC). According to the invention there is provided an aqueous pulp suspension with a consistency of at least 15%, and at least one oxidant is added to the suspension to oxidize cellulosic hydroxyl groups in the suspension under mechanical mixing or shearing. The oxidized suspension, washed and diluted to a lower consistency, is subjected to homogenization to yield gel-like MFC. Alkali hypochlorite may be used as oxidant, and preferred mediating oxidation catalysts are AZADO and TEMPO. Alkali bromide may be used as a cocatalyst. The MFC product, which as a suspension has an increased viscosity, is suitable as a means of regulating viscosity or for production of films and composites. 1. A method of producing oxidized cellulose comprising the steps of:(a) providing an aqueous pulp suspension with a consistency of at least 15 wt-%,(b) adding at least one oxidant to the suspension, and(c) oxidizing cellulosic hydroxyl groups under mechanical mixing or shearing of the suspension.2. The method of claim 1 , wherein aqueous pulp suspension has lignin content of less than 5 wt % claim 1 , from the dry solids of the mass.3. The method of wherein the oxidized suspension from step (c) is subjected to fibrillation to yield a gel-like suspension comprising microfibrillated cellulose (MFC).4. The method of claim 3 , wherein said fibrillation is homogenization.5. The method of wherein the consistency of the suspension at step (a) is 20 to 30 wt-%.6. The method of wherein AZADO or TEMPO or a combination thereof catalyst is used to mediate the oxidation.7. The method of claim 6 , wherein the oxidant is alkali hypochlorite.8. The method of wherein alkali bromide is added as a cocatalyst.9. The method of wherein alkali hypochlorite and alkali bromide are first added to the suspension claims 6 , followed by addition of AZADO or TEMPO or a combination thereof.10. The method of wherein the oxidized ...

CIGARETTE ROLLING PAPERS FORMED FROM KOMBUCHA BIOFILMS

Rolling papers formed from fermented microbial cellulose derivatives (e.g., Kombucha fermentation biofilms) and methods of manufacture are described. 1. A product comprising:cellulose from a microbe grown in a symbiotic colony of bacteria and yeast (SCOBY);wherein the product is a paper having one or more properties suitable for use as a cigarette rolling paper.2. The product of claim 1 , wherein the one or more properties comprise burn rate claim 1 , permeability claim 1 , porosity claim 1 , tensile strength claim 1 , tearing strength claim 1 , basis weight claim 1 , and/or opacity.3. The product of claim 1 , wherein the paper has a burn rate in the range of 0.001-0.006 g/s claim 1 , a porosity in the range of 1-10 CU claim 1 , a tensile strength in the range of 10-35 N claim 1 , a tension strength in the range of 1-10% claim 1 , and/or basis weight in the range of 10-40 GSM.4. The product of claim 1 , wherein the SCOBY is formed during Kombucha culture and/or fermentation.5. The product of claim 1 , wherein the product does not comprise an adhesive.6. The product of claim 1 , wherein the product comprises less than 15 mg/Kg by weight of Crotonaldehyde.7. The product of claim 1 , wherein the product does not comprise harmful and potentially harmful constituents (HPHCs) claim 1 , comprising N-Nitrosonornicotine claim 1 , Anabasine claim 1 , and Isoprene.8. The product of claim 1 , wherein the product does not comprise harmful and potentially harmful constituents (HPHCs) claim 1 , comprising N-Nitrosonornicotine claim 1 , Anabasine claim 1 , Isoprene claim 1 , Benzene claim 1 , Toluene claim 1 , NNK claim 1 , 4-aminobiphenyl claim 1 , 2-Naphthylamine claim 1 , Acrolein claim 1 , and 1 claim 1 ,3-butadiene.9. The product of claim 1 , wherein the product does not comprise harmful and potentially harmful constituents (HPHCs) comprising claim 1 , Acetamide claim 1 , Acetone claim 1 , Acrolein claim 1 , Acrylamide claim 1 , Acrylonitrile claim 1 , Aflatoxin B1 claim 1 , 4 ...

CELLULOSE FIBER-CONTAINING MATERIAL AND METHOD FOR PRODUCING CELLULOSE FIBER-CONTAINING MATERIAL

It is an object of the present invention to provide an ultrafine cellulose fiber-containing material having favorable re-dispersibility, which can exhibit excellent thickening properties after it has been re-dispersed, even after long-term storage. The present invention relates to a cellulose fiber-containing material comprising cellulose fibers having a fiber width of 1000 nm or less and a di- or more-valent metal component, wherein the content of the cellulose fibers is 5% by mass or more with respect to the total mass of the cellulose fiber-containing material, the content of the metal component is 0.5% by mass or less with respect to the total mass of the cellulose fiber-containing material, and when the cellulose fiber-containing material is processed into a slurry having a solid concentration of 0.5% by mass, the pH of the slurry is 4 or more. 1. A cellulose fiber-containing material comprising cellulose fibers having a fiber width of 1000 nm or less and a di- or more-valent metal component , whereinthe content of the cellulose fibers is 5% by mass or more with respect to the total mass of the cellulose fiber-containing material,the content of the metal component is 0.5% by mass or less with respect to the total mass of the cellulose fiber-containing material, andwhen the cellulose fiber-containing material is processed into a slurry having a solid concentration of 0.5% by mass, the pH of the slurry is 4 or more.2. The cellulose fiber-containing material according to claim 1 , which further comprises a surfactant.3. The cellulose fiber-containing material according to claim 2 , wherein the surfactant is a nonionic surfactant.4. The cellulose fiber-containing material according to claim 1 , which further comprises a water-soluble organic compound.5. The cellulose fiber-containing material according to claim 1 , which is a solid.6. The cellulose fiber-containing material according to claim 1 , having a viscosity retention percentage of 10% or more claim 1 , ...

METHODS FOR PRODUCING ULTRAFINE FIBER AND ULTRAFINE FIBER-CONTAINING SHEET, SHEET OBTAINED THEREBY, AND RESIN COMPOSITE COMPRISING LAMINATED RESINS

An object of the present invention is to provide a method for producing an ultrafine fiber-containing sheet with suppressed yellowing. Another object of the present invention is to provide an efficient method for eliminating an introduced substituent, and a composite sheet comprising an organic layer and/or an inorganic layer laminated on the obtained sheet. The present invention provides a method for producing an ultrafine fiber-containing sheet, comprising (a) introducing a substituent having electrostatic and/or steric functionality to a fiber raw material to obtain substituent-introduced fiber; (b) machine-processing the substituent-introduced fiber obtained in the step (a) to obtain substituent-introduced ultrafine fiber; (c) preparing a sheet from the substituent-introduced ultrafine fiber obtained in the step (b); and (d) eliminating at least a portion of introduced substituents from the sheet obtained in the step (c). In a preferred aspect, the substituent having electrostatic and/or steric functionality is a phosphoric acid-derived group, and the method may further comprise, after the step (a) and before the step (c), the step of (e) changing the degree of neutralization of the substituent-introduced fiber or the substituent-introduced ultrafine fiber. 119-. (canceled)20. A method for producing an ultrafine fiber-containing sheet , comprising at least:(a) introducing a substituent having electrostatic and/or steric functionality to a fiber raw material to obtain substituent-introduced fiber; (b) machine-processing the substituent-introduced fiber obtained in the step (a) to obtain substituent-introduced ultrafine fiber; (c) preparing a sheet from the substituent-introduced ultrafine fiber obtained in the step (b); and (d) eliminating at least a portion of introduced substituents by treating the sheet obtained in the step (c) with an alcohol.21. The method according to claim 20 , wherein the alcohol is a polyhydric alcohol.22. The method according to claim ...

METHODS OF MAKING PAPER AND PAPER WITH MODIFIED CELLULOSE PULPS

The present invention relates to an improved process for producing chemical cellulose pulp wherein biopolymers are added immediately before, during or after a bleaching step, depending on pulp characteristics and on process conditions used. The biopolymers according to the present invention are starches chemically modified by an etherification reaction. This treatment results in a differentiated pulp having improved physical, chemical and mechanical properties when compared with cellulose pulps obtained by traditional processes. The use of said biopolymer alters the relations between important pulp properties rendering their application in papermaking process advantageous. This differentiation increases the possibilities of use and also of new applications, including for the substitution of pulps produced from other cellulose sources. Thus, the present invention also relates to methods of making paper, such as printing, writing, decorative, special or tissue-type papers, through the use of the cellulose pulps modified by the above process. 17-. (canceled)8. A paper comprising a modified cellulose pulp treated by a process comprising a step of adding during bleaching starch chemically modified by etherification.9. The method paper of claim 8 , wherein the starch is from natural sources selected from corn or manioc.10. The paper of claim 8 , wherein the starch is added in an amount of 5.0 kg/adt to 20.0 kg/adt based on the total amount of pulp.11. The paper of claim 8 , wherein the starch is added approximately at 45° C. to 95° C. claim 8 , with pH from 3 to 11 claim 8 , and contact time between the starch and the pulp in the range of from 10 to 360 minutes.12. The paper of claim 8 , wherein the starch is added in any of the bleaching steps claim 8 , immediately before the bleaching sequence and/or after the bleaching sequence but prior to pulp drying.13. The paper of claim 8 , wherein the paper is tissue-type paper.14. The paper of claim 8 , wherein the paper is ...

CROSSLINKED CELLULOSE AS PRECURSOR IN PRODUCTION OF HIGH-GRADE CELLULOSE DERIVATIVES AND RELATED TECHNOLOGY

A pulp in accordance with a particular embodiment includes crosslinked cellulose fibers. The pulp can have high brightness, reactivity, and intrinsic viscosity. The pulp, therefore, can be well suited for use as a precursor in the production of low-color, high-viscosity cellulose derivatives. A method in accordance with a particular embodiment of the present technology includes forming a pulp from a cellulosic feedstock, bleaching the pulp, crosslinking cellulose fibers within the pulp while the pulp has a high consistency, and drying the pulp. The bleaching process can reduce a lignin content of the pulp to less than or equal to 0.09% by oven-dried weight of the crosslinked cellulose fibers. Crosslinking the cellulose fibers can include exposing the cellulose fibers to a glycidyl ether crosslinker having two or more glycidyl groups and a molecular weight per epoxide within a range from 140 to 175. 1. A method , comprising:forming a pulp from a cellulosic feedstock;bleaching the pulp;crosslinking cellulose fibers within the pulp while the pulp has a consistency greater than or equal to 12%; anddrying the pulp after bleaching the pulp and after crosslinking the cellulose fibers, wherein the dried pulp has a resultant carboxymethyl cellulose viscosity greater than or equal to 60 centipoise.2. The method of wherein crosslinking the cellulose fibers includes crosslinking the cellulose fibers while the pulp has a consistency greater than or equal to 15%.3. The method of wherein bleaching the pulp includes bleaching the pulp according to a Kraft bleaching process.4. The method of wherein bleaching the pulp includes oxygen bleaching the pulp.5. The method of wherein bleaching the pulp includes chlorine dioxide bleaching the pulp after oxygen bleaching the pulp.6. The method of wherein bleaching the pulp includes increasing a brightness of the pulp to a brightness greater than or equal to 75%.7. The method of wherein bleaching the pulp includes reducing a lignin content of ...

REDUCED FURFURAL CONTENT IN POLYACRYLIC ACID CROSSLINKED CELLULOSE FIBERS

Bleached polycrylic acid crosslinked cellulose fibers with reduced furfural content are disclosed. The reduced furfural content is accompanied by a strong reduction of malodor associated with crosslinked fibers. Methods of furfural reduction include treatment with hydrogen peroxide in the absence of alkaline or other bleaching agents subsequent to curing polyacrylic acid crosslinked cellulose fibers. Some embodiments of treated polycrylic acid crosslinked cellulose fibers have a furfural content lower than 1.3 ppm. In some embodiments, the reduction of furfural content of the treated crosslinked fibers compared to untreated crosslinked fibers is at least 55%. in some embodiments, furfural content decreases with aging of the treated crosslinked fibers. 1. A method of reducing the furfural content of polyacrylic acid crosslinked cellulosic fibers , the method comprising treating the polyacrylic acid crosslinked cellulosic fibers with hydrogen peroxide alone in the absence of sodium hydroxide , in a bleaching stage subsequent to a curing stage , to polyacrylic acid crosslinked cellulosic fibers , in an amount of from about 0.1 to about 20 pounds (about 0.045 to about 9.07 kg) per ADMT of fiber and at a hydrogen peroxide pH of between about 4.5 and about 5 , wherein the amount of furfural in the treated crosslinked fibers reduces from a first value determined at one day after the treatment of the crosslinked fibers to a second , subsequent value determined at 12 days , 14 days , or 21 days after treatment.2. The method of claim 1 , wherein hydrogen peroxide is applied to the fibers in an amount of from about 3.0 to about 10 pounds (about 1.36 to about 4.54 kg) per ADMT fiber.3. The method of claim 1 , wherein hydrogen peroxide is applied to the fibers in an amount of about 5 pounds (2.27 kg) per ADMT fiber.4. The method of claim 1 , wherein the hydrogen peroxide is applied by spraying the hydrogen peroxide alone into an air stream containing the crosslinked fibers.5. ...

CELLULOSE FIBER-CONTAINING COMPOSITION

It is an object of the present invention to provide an ultrafine cellulose fiber-containing composition having favorable dispersibility even in the presence of a specific organic solvent. The present invention relates to a cellulose fiber-containing composition comprising cellulose fibers having a fiber width of 1000 nm or less, water, and alcohol, wherein the alcohol is at least one type selected from monovalent primary alcohol, monovalent secondary alcohol, and polyhydric alcohol, and the dielectric constant of the cellulose fiber-containing composition at 25° C. is 55 or more and less than 80. 1. A cellulose fiber-containing composition comprising cellulose fibers having a fiber width of 1000 nm or less , water , and alcohol , whereinthe alcohol is at least one type selected from monovalent primary alcohol, monovalent secondary alcohol, and polyhydric alcohol, andthe dielectric constant of the cellulose fiber-containing composition at 25° C. is 55 or more and less than 80.2. The cellulose fiber-containing composition according to claim 1 , wherein the content of the alcohol is 10% by mass or more with respect to the total mass of the cellulose fiber-containing composition.3. The cellulose fiber-containing composition according to claim 1 , wherein when the cellulose fiber-containing composition is processed into a slurry having a solid concentration of 0.2% by mass and the slurry is then left at rest under the environment of 25° C. for 16 hours or more claim 1 , the haze of the slurry measured in accordance with JIS K 7136 is 20% or less.4. The cellulose fiber-containing composition according to claim 1 , wherein when the cellulose fiber-containing composition is processed into a slurry having a solid concentration of 0.4% by mass and the slurry is then left at rest under the environment of 25° C. for 16 hours or more claim 1 , the viscosity of the slurry measured by rotating at 25° C. at a rotation number of 3 rpm for 3 minutes claim 1 , using a type B ...

Multi-stage catalytic carboxylation of mercerized cellulose fibers

Carboxylated, mercerized cellulose fiber having at least 12 meq/100 g of carboxyl substitution at the C-6 position of the anhydroglucose units, which includes at least 20% cellulose II, may be produced by catalytically carboxylating mercerized cellulose fiber in at least two catalytic carboxylation stages in a continuous series in which the pH is adjusted, and a primary oxoammonium salt catalyst (or precursor thereof) and secondary oxidant is added, at the beginning of each stage. Optionally, the carboxylated, mercerized cellulose may be made substantially free of aldehyde groups by means of a stabilizing step following the final carboxylation stage, in which aldehyde groups present in the fibers are converted to carboxyl groups.

Methods of Making Paper and Paper with Modified Cellulose Pulps

The present invention relates to an improved process for producing chemical cellulose pulp wherein biopolymers are added immediately before, during or after a bleaching step, depending on pulp characteristics and on process conditions used. The biopolymers according to the present invention are starches chemically modified by an etherification reaction. This treatment results in a differentiated pulp having improved physical, chemical and mechanical properties when compared with cellulose pulps obtained by traditional processes. The use of said biopolymer alters the relations between important pulp properties rendering their application in papermaking process advantageous. This differentiation increases the possibilities of use and also of new applications, including for the substitution of pulps produced from other cellulose sources. Thus, the present invention also relates to methods of making paper, such as printing, writing, decorative, special or tissue-type papers, through the use of the cellulose pulps modified by the above process. 1. A modified cellulose pulp treated by a process comprising a step of adding during bleaching starch chemically modified by etherification.2. The modified cellulose pulp of wherein the starch is from natural sources selected from corn or manioc.3. The modified cellulose pulp of wherein the starch is added in an amount of 5.0 kg/adt to 20.0 kg/adt based on the total amount of pulp.4. The modified cellulose pulp of wherein the starch is added approximately at 45° C. to 95° C. claim 1 , with pH from 3 to 11 claim 1 , and contact time between the starch and the pulp in the range of from 10 to 360 minutes.5. The modified cellulose pulp of wherein the starch is added in any of the bleaching steps claim 1 , immediately before the bleaching sequence and/or after the bleaching sequence but prior to pulp drying.6. A method of making paper comprising using a modified cellulose pulp treated by a process comprising a step of adding during ...

PAPERMAKING PROCESS EMPLOYING CARBOXYLATED CELLULOSIC FIBERS

A papermaking process includes, firstly, providing carboxylated cellulosic fibers with a carboxyl group content being in the range from 0.06 to 1.5 mmol/g. Then the carboxylated cellulosic fibers are employed to prepare mixing pulp including filler particles, wherein the content of the carboxylated cellulosic fibers in the mixing pulp is in the range from 40% to 100% by dry fiber weight of the mixing pulp. After that, paper is made employing the mixing pulp. 1. A papermaking process comprising:providing carboxylated cellulosic fibers with carboxyl group content being in the range from 0.06 to 1.5 millimoles/gram;employing the carboxylated cellulosic fibers to prepare mixing pulp with filler particles added therein, the content of carboxylated cellulosic fibers in the mixing pulp being in the range from 40% to 100% by dry fiber weight of the mixing pulp; andmaking paper employing the mixing pulp.2. The papermaking process of claim 1 , wherein the carboxyl group content of the carboxylated cellulosic fibers is in the range from 0.15 to 0.5 millimoles/gram.3. The papermaking process of claim 1 , wherein the content of the carboxylated cellulosic fibers in the mixing pulp is in the range from 40% to 50% by dry fiber weight of the mixing pulp.4. The papermaking process of claim 1 , wherein the content of the filler particles in the mixing pulp is in the range from 1% to 80% by dry fiber weight of the mixing pulp.5. The papermaking process of claim 1 , wherein the content of the filler particles in the mixing pulp is in the range from 20% to 60% by dry fiber weight of the mixing pulp.6. The papermaking process of claim 1 , wherein the carboxylated cellulosic fibers are obtained from plant fibers modified by a non-selective oxidation system that oxidizes both primary hydroxyl groups and secondary hydroxyl groups of the plant fibers to carboxyl groups.7. The papermaking process of claim 6 , wherein the non-selective oxidation system utilizes one or more items selected from ...

METHOD FOR PREPARING NANOFIBRILLAR CELLULOSE

The method for preparing nanofibrillar cellulose comprises —disintegrating (DIS1) fibrous cellulosic raw material to a first disintegration level to a half-fabricate, —transporting (TRANS) the half-fabricate in the first disintegration level in concentrated form to a destination, and —at the destination, disintegrating (DIS2) the half-fabricate from the first disintegration level to the second disintegration level to nanofibrillar cellulose. 1. Method for preparing nanofibrillar cellulose , comprisingdisintegrating fibrous cellulosic raw material to a first disintegration level to a half-fabricate, wherein the disintegration level corresponds to the degree of fibrillation of the fibrous cellulosic raw material,transporting the half-fabricate in the first disintegration level in concentrated form, where the dry matter of the half-fabricate is in the range of 20-60 wt-%, to a destination, andat the destination, disintegrating the half-fabricate from the first disintegration level to the second disintegration level to nanofibrillar cellulose.2. (canceled)3. The method according to claim 1 , wherein the method further comprisesafter disintegrating the fibrous cellulosic raw material to a half-fabricate, raising the concentration of the half fabricate to obtain the half-fabricate in concentrated form, preferably wherein the fibrous cellulosic raw material is disintegrated to the first disintegration level at a consistency of 1-5%.4. (canceled)5. The method according to claim 3 , wherein the concentration of the half-fabricate is raised by dewatering by filtration.6. The method according to claim 3 , wherein the concentration is raised by dewatering at least partly by pressure.7. The method according to claim 3 , wherein raising the concentration comprises lowering the pH of a suspension of the half fabricate claim 3 , preferably wherein the cellulose in the half fabricate contains dissociable acid moieties claim 3 , especially carboxyl groups.8. (canceled)9. The method ...

MICROFIBROUS CELLULOSE-CONTAINING SUBSTANCE

A microfibrous cellulose aggregate containing microfibrous cellulose having an average fiber width of 2 nm to 50 nm and a liquid compound including at least one of water or an organic solvent. The content of the microfibrous cellulose is from 6 mass % to 80 mass % per the mass of the entire microfibrous cellulose aggregate, and the content of the liquid compound is at least 15 mass % per the mass of the entire microfibrous cellulose aggregate. 1. A microfibrous cellulose-containing substance , comprising:microfibrous cellulose having fibers with an average fiber width of 2 nm to 50 nm;a first liquid compound comprising at least one of water or an organic solvent; andat least one compound selected from the group consisting of acids, cationic surfactants, and cationic polymer flocculants;wherein a content of the microfibrous cellulose is from 6 mass % to 80 mass % per a mass of an entire microfibrous cellulose-containing substance;a content of the first liquid compound is at least 15 mass % per the mass of the entire microfibrous cellulose-containing substance;said microfibrous cellulose is flocculated such that said fibers of said microfibrous cellulose are aggregated; andsaid microfibrous cellulose-containing substance is in a gel state.2. The microfibrous cellulose-containing substance according to claim 1 , further comprising at least one compound selected from the group consisting of alkalis claim 1 , anionic surfactants claim 1 , and anionic polymer flocculants.3. The microfibrous cellulose-containing substance according to claim 1 , further comprising a cellulose plasticizer.4. The microfibrous cellulose-containing substance according to claim 1 , wherein at least 40 mass % of a solid content contained in the microfibrous cellulose-containing substance is the microfibrous cellulose.5. The microfibrous cellulose-containing substance according to claim 1 , wherein a maximum fiber width of the microfibrous cellulose is at most 50 nm.6. A concentrate obtained by ...

SURFACE-MODIFIED CELLULOSIC MATERIALS AND METHODS OF PRODUCING THE SAME

Cellulosic materials modified with a surface modifier to promote compatibility with a hydrophobic material and methods for producing surface-modified cellulosic materials are provided. The methods include providing a slurry of a cellulosic material and adding a surface modifier to the slurry. The surface modifier may be added to the slurry in a soluble form and precipitated by adjusting the pH. The surface-modified cellulosic material may be solvent-dried and/or dried using conventional drying methods to enhance hydrophobicity. To solvent-dry the surface-modified cellulosic material, a solvent is added to an aqueous slurry of the surface-modified cellulosic material to form an azeotrope. The azeotrope has a boiling point that is less than the boiling point of the solvent. The slurry is distilled to remove the azeotrope from the surface-modified cellulose material. The solvent is removed from the surface-modified cellulose material. 2. A method according to claim 1 , wherein adding a surface modifier comprises adding a solution of the surface modifier to the slurry.3. A method according to or claim 1 , further comprising adjusting the pH of the slurry to precipitate the surface modifier on to the surface of the cellulosic material.4. A method according to claim 3 , wherein adjusting the pH of the slurry to precipitate the surface modifier comprises adding a base.5. A method according to any one of to claim 3 , wherein adding a surface modifier to the slurry comprises adding an amount of the surface modifier that is equal to or in excess of the amount of surface modifier required to coat substantially all of the surface of the cellulosic material.6. A method according to any one of to claim 3 , wherein the surface modifier comprises a copolymer.7. A method according to any one of to claim 3 , wherein the surface modifier comprises a modified styrene-co-maleic anhydride (SMA) copolymer.8. A method according to claim 7 , wherein the molecular weight of the surface ...

HIGH BULK TISSUE COMPRISING CROSS-LINKED FIBERS

The present application relates to a cross-linked fiber and more specifically to fibers that have been subjected to cold caustic extraction (at less than 60° C.) to reduce the hemicellulose content of the fibers by at least 50% and then cross-linked with a cross-linking agent that is curable at a modest temperature, such as less than 160° C. The treated cross-linked fibers preferably have a hemicellulose content that is less than 5% by weight of the fiber. Preferable cross-linking agents are polyamide-epichlorohydrin (PAE) resins, polyamide-polyamine-epichlorohydrin (PPE) resins, and polydiallylamine-epichlorohydrin resins. The cross-linked fibers are readily dispersible in water even without fiberization and generally form webs and products having relatively few knits or knots. As such, the cross-linked fibers of the present invention are well suited for use in the manufacture of tissue webs and products, particularly wet-laid tissue webs and products. 1. A method of manufacturing a cross-linked fiber comprising the steps of: (a) providing a plurality of fibers having a first hemicellulose content , (b) treating a plurality of fibers with a caustic solution at a temperature less than about 60° C. to yield a plurality of caustic extracted fibers having a second hemicellulose content which is at least about 50 percent less than the first hemicellulose content (c) mixing the caustic extracted fibers with a cross-linking agent to yield a plurality of treated fibers , and (d) drying the treated fibers at a drying temperature less than about 200° C. to yield a plurality of cross-linked fibers.2eucalyptus. The method of wherein the plurality of fibers are hardwood kraft pulp fibers and the second hemicellulose content is less than about 5.0 percent by weight of the fiber.3. The method of further comprising the step of dispersing the fibers in water to form a fiber slurry having a fiber consistency from about 2.0 to about 25 percent prior to the step of treating the ...

LOW COARSENESS SOUTHERN SOFTWOOD PULPS

Pulp sheets produced from Southern pine fibers are disclosed. Embodiments in which the fibers have a fiber length to coarseness ratio equal to or greater than 0.11, with fiber length (LWAFL) in mm and coarseness in mg/100 m, are found to impart stiffness properties to tissue grade handsheets made therefrom comparable to those achieved using of standard NBSK. Embodiments in which the fibers have a low coarseness (of from about 16 to about 20 mg/100 m, at a fiber length (LWAFL) of from about 1.6 to about 3.0 mm) are found to impart wicking properties to absorbent structures made therefrom that are improved relative to those achieved using standard high coarseness SBSK. 1. A pulp sheet comprising Southern pine fibers that have a fiber length to coarseness ratio from about 0.125 to 0.142 , wherein fiber length (LWAFL) is in mm , and coarseness is in mg/100 m , wherein the length to coarseness ratio of the fibers is at a coarseness of from about 19 to about 20 mg/100 m and a fiber length of from about 2.5 to about 2.7 mm , and wherein the content of said Southern pine fibers is at least 20%.2. The pulp sheet of claim 1 , wherein the length to coarseness ratio of the fibers is about 0.13.3. The pulp sheet of claim 1 , wherein the length to coarseness ratio of the fibers is at one or more ofa coarseness of from about 16 to about 25 mg/100 m, anda fiber length of from about 1.6 to about 3.0 mm.46-. (canceled)7. The pulp sheet of claim 1 , wherein the fibers are bleached Southern pine pulp fibers.8. The pulp sheet of claim 1 , wherein the fibers are kraft Southern pine pulp fibers.9. The pulp sheet of claim 1 , wherein the fibers are SBSK pulp fibers.10Pinus elliottiiPinus palustrisPinus echinataPinus taedaPinus virginianaPinus strobusPinus rigidaPinus clausaPinus serotinaPinus pungens. The pulp sheet of claim 1 , wherein the fibers are one or more of slash pine () claim 1 , longleaf pine () claim 1 , shortleaf pine () claim 1 , loblolly pine () claim 1 , Virginia pine () ...

CELLULOSE FIBER AND METHOD FOR PRODUCING CELLULOSE FIBER

A cellulose fiber according to the invention is a cellulose fiber in which hydroxy groups of cellulose represented by the following formula (1) are substituted with a boronate ester group represented by the following formula (2), and includes at least one of: a type 1 structure in which hydroxy groups of at least one of the unit structures a and b of the same cellulose molecular chain n of the cellulose are substituted with the boronate ester group; a type 2 structure in which hydroxy groups of both unit structures a and b of the same cellulose molecular chain n of the cellulose are substituted with the boronate ester group; and a type 3 structure in which hydroxy groups of different cellulose molecular chains n of the cellulose are substituted with the boronate ester group, wherein carbon to which the hydroxy groups to be substituted with the boronate ester group are bonded is two carbon atoms selected from the carbon atoms at positions 2, 3, and 6 of the unit structures a and b. 2. The cellulose fiber according to claim 1 , wherein R1 of the boronate ester group is a phenyl group.3. A method for producing a cellulose fiber claim 1 , comprising a reaction step of performing an esterification reaction of cellulose using a reaction solution which has a neutral to alkaline pH and contains a composition containing the cellulose claim 1 , a boronic acid compound claim 1 , and a solvent.4. The method for producing a cellulose fiber according to claim 3 , wherein the boronic acid compound is phenylboronic acid.5. The method for producing a cellulose fiber according to claim 3 , wherein the reaction solution contains an organic alkali which does not contain a metal element.6. The method for producing a cellulose fiber according to claim 3 , wherein the reaction solution contains an electron donating substance.7. The method for producing a cellulose fiber according to claim 6 , wherein the electron donating substance is dimethylethylamine.8. The method for producing a ...

CROSSLINKED CELLULOSE AS LOW-COST PRECURSOR IN PRODUCTION OF HIGH-GRADE CELLULOSE DERIVATIVES AND RELATED TECHNOLOGY

A pulp in accordance with a particular embodiment includes crosslinked cellulose fibers. The pulp can have high brightness, reactivity, and intrinsic viscosity. The pulp, therefore, can be well suited for use as a precursor in the production of low-color, high-viscosity cellulose derivatives. A method in accordance with a particular embodiment of the present technology includes forming a pulp from a cellulosic feedstock, bleaching the pulp, crosslinking cellulose fibers within the pulp while the pulp has a high consistency, and drying the pulp. The bleaching process can reduce a lignin content of the pulp to less than or equal to 0.09% by oven-dried weight of the crosslinked cellulose fibers. Crosslinking the cellulose fibers can include exposing the cellulose fibers to a glycidyl ether crosslinker having two or more glycidyl groups and a molecular weight per epoxide within a range from 140 to 175. 1. A method , comprising:forming a pulp from a cellulosic feedstock;bleaching the pulp;crosslinking cellulose fibers within the pulp while the pulp has a consistency greater than or equal to 12%; anddrying the pulp after bleaching the pulp and after crosslinking the cellulose fibers, wherein the dried pulp has a resultant carboxymethyl cellulose viscosity greater than or equal to 60 centipoise.2. The method of wherein crosslinking the cellulose fibers includes crosslinking the cellulose fibers while the pulp has a consistency greater than or equal to 15%.3. The method of wherein bleaching the pulp includes bleaching the pulp according to a Kraft bleaching process.4. The method of wherein bleaching the pulp includes oxygen bleaching the pulp.5. The method of wherein bleaching the pulp includes chlorine dioxide bleaching the pulp after oxygen bleaching the pulp.6. The method of wherein bleaching the pulp includes increasing a brightness of the pulp to a brightness greater than or equal to 75%.7. The method of wherein bleaching the pulp includes reducing a lignin content of ...

CROSSLINKED CELLULOSE AS PRECURSOR IN PRODUCTION OF HIGH-GRADE CELLULOSE DERIVATIVES AND RELATED TECHNOLOGY

A pulp in accordance with a particular embodiment includes crosslinked cellulose fibers. The pulp can have high brightness, reactivity, and intrinsic viscosity. The pulp, therefore, can be well suited for use as a precursor in the production of low-color, high-viscosity cellulose derivatives. A method in accordance with a particular embodiment of the present technology includes forming a pulp from a cellulosic feedstock, bleaching the pulp, crosslinking cellulose fibers within the pulp while the pulp has a high consistency, and drying the pulp. The bleaching process can reduce a lignin content of the pulp to less than or equal to 0.09% by oven-dried weight of the crosslinked cellulose fibers. Crosslinking the cellulose fibers can include exposing the cellulose fibers to a glycidyl ether crosslinker having two or more glycidyl groups and a molecular weight per epoxide within a range from 140 to 175. 1. Pulp , comprising:crosslinked cellulose fibers, a resultant carboxymethyl cellulose viscosity greater than or equal to 60 centipoise,', 'a brightness greater than or equal to 75%, and', 'a water retention value greater than or equal to 1.1 g/g., 'wherein the pulp has'}2. The pulp of claim 1 , wherein the pulp is a Kraft pulp.3. The pulp of claim 1 , wherein the pulp is bleached.4. The pulp of claim 1 , wherein the pulp is at least partially insoluble in cupriethylenediamine.5. The pulp of claim 1 , further comprising less than or equal to 0.09% lignin by oven-dried weight of the crosslinked cellulose fibers.6. The pulp of claim 1 , further comprising greater than or equal to 10% hemicellulose by oven-dried weight of the crosslinked cellulose fibers.7. The pulp of claim 1 , wherein the pulp has a resultant carboxymethyl cellulose viscosity greater than or equal to 90 centipoise.8. The pulp of claim 1 , wherein the pulp has a resultant carboxymethyl cellulose color less than or equal to 5.9. The pulp of claim 1 , wherein the pulp has a resultant carboxymethyl cellulose ...

RESILIENT HIGH BULK TISSUE PRODUCTS

The present invention provides tissue webs and products that are manufactured by non-compressive dewatering and/or drying methods, such as through-air drying, where the webs and products comprise cross-linked fiber. The non-compressively dewatered tissue webs and products have improved sheet bulk and z-direction properties. For example, in one embodiment, the invention provides through-air dried tissue products having good sheet bulk and resiliency, such as a sheet bulk greater than about 15 cc/g and Compression Energy (E) greater than about 1.30 N/m. Surprisingly the foregoing products have sufficient strength to withstand use, such as a GMT greater than about 600 g/3″, but are not overly stiff, generally having a Stiffness Index less than about 12. 1. A tissue product comprising at least one non-compressively dewatered tissue web , the product having a basis weight from about 20 to about 50 gsm , a sheet bulk of about 12 cc/g or greater and a Compression Energy (E) greater than about 1.30 N/m.2. The tissue product of wherein the product has a geometric mean tensile strength (GMT) from about 600 to about 1 claim 1 ,000 g/3″ and a Stiffness Index less than about 12.3. The tissue product of wherein the product has a Vertical Absorbent Capacity greater than about 10 g/g.4. The tissue product of wherein the product Compression Energy (E) is from about 1.30 to about 2.00 N/m.5. The tissue product of wherein the product consists essentially of a single non-compressively dewatered tissue web claim 1 , the product having a basis weight from about 30 to about 45 gsm and a Vertical Absorbent Capacity from about 10 to about 15 g/g.6. The tissue product of having a GMT from about 600 to about 1 claim 5 ,000 g/3″ and a Stiffness Index from about 4 to about 10.7. The tissue product of wherein the tissue web comprises from about 30 to about 75 percent claim 1 , by weight of the product claim 1 , cross-linked cellulosic fibers.8. The tissue product of wherein the cross-linked ...

PRODUCT HAVING A PAPER LAYER AND A FILM LAYER AND METHODS OF FORMING SUCH A PRODUCT

A product having a paper layer and a film layer is disclosed along with methods of forming such a product. 1. A product comprising:a) a first layer having a high bulk, three-dimensional structure formed from an aqueous dispersion of papermaking fibers, and said first layer having a thickness of less than about 4 millimeters;b) a liquid-impermeable, second layer formed from a polyolefin, said second layer having a thickness which is at least 50% less than the thickness of said first layer; and{'sup': '3', 'c) said first and second layers being secured together to form said product, and said product has a basis weight of greater than about 10 gsm, a bulk of greater than about 10 cm/g, and a wet strength ratio of greater than about 0.70.'}2. The product of wherein said first layer is a single ply having a thickness of less than about 3 mm claim 1 , said second layer is a polyolefin claim 1 , said first layer is secured to said second layer by a pressure-sensitive adhesive claim 1 , and said product has a specific modulus of less than about 0.005 kilograms/grams/3 inches.3. The product of wherein said first layer contains 2 plies and has a thickness of less than about 2.5 mm claim 2 , said second layer is a polyethylene and has a basis weight of from between about 0.1 gsm to about 5.0 gsm claim 2 , and said product has a basis weight of greater than about 20 gsm and a wet strength ratio of greater than about 0.80.4. The product of wherein said first layer has a thickness which is at least twice the thickness of said second layer claim 3 , said second layer has a thickness of less than about 1 mm claim 3 , each of said first and second layers has a periphery claim 3 , and said periphery of said first layer is coextensive with said periphery of said second layer.5. The product of wherein said first layer contains 3 plies and has a thickness which is at least 3 times the thickness of said second layer claim 3 , said second layer has a thickness of less than about 1 mm ...

MODIFIED FIBER, METHODS, AND SYSTEMS

Methods of forming crosslinked cellulose include mixing a crosslinking agent with an aqueous mixture of cellulose fibers containing little to no excess water (e.g., solids content of 25-55%), drying the resulting mixture to 85-100% solids, then curing the dried mixture to crosslink the cellulose fibers. Systems include a mixing unit to form, from an aqueous mixture of unbonded cellulose fibers having a solids content of about 25-55% and a crosslinking agent, a substantially homogenous mixture of non-crosslinked, unbonded cellulose fibers and crosslinking agent; a drying unit to dry the substantially homogenous mixture to a consistency of 85-100%; and a curing unit and to cure the crosslinking agent to form dried and cured crosslinked cellulose fibers. Intrafiber crosslinked cellulose pulp fibers produced by such methods and/or systems have a chemical on pulp level of about 2-14% and an AFAQ capacity of at least 12.0 g/g. 16-. (canceled)7. A crosslinked cellulose product comprising individual intrafiber crosslinked cellulose pulp fibers having a chemical on pulp level of about 2-14% and an automatic fiber absorption quality (“AFAQ”) capacity of at least 12.0 g/g.8. The crosslinked cellulose product of claim 7 , wherein the intrafiber crosslinked cellulose pulp fibers include softwood cellulose pulp fibers.9. The crosslinked cellulose product of claim 7 , wherein the intrafiber crosslinked cellulose pulp fibers are treated cellulose pulp fibers.10. The crosslinked cellulose product of claim 7 , wherein the intrafiber crosslinked cellulose pulp fibers are hardwood cellulose pulp fibers.11eucalyptus. The crosslinked cellulose product of claim 10 , wherein the hardwood cellulose pulp fibers are pulp fibers.12. The crosslinked cellulose product of claim 7 , wherein the intrafiber crosslinked cellulose pulp fibers are intrafiber crosslinked with one or more of a polyacrylic acid and a polycarboxylic acid crosslinking agent.13. The crosslinked cellulose product of claim 7 , ...

DRY CELLULOSE FILAMENTS AND THE METHOD OF MAKING THE SAME

The present invention relates to dry cellulose filaments and particularly those that are re-dispersible in water. Dry cellulose filaments comprise at least 50% by weight of the filaments having a filament length up to 350 μm; and a diameter of between 100 and 500 nm, wherein the filaments are re-dispersible in water. Also described here is a film of dry cellulose filaments comprising the filaments described, wherein the film is dispersible in water. A method of making a dry film of cellulose filaments is also described that includes providing a liquid suspension of the cellulose filaments described; and retaining the filaments on the forming section of a paper or tissue making machine or on a modified paper or tissue making machine. The film can be optionally converted to powders or flakes for shipment, storage or subsequent uses. The filaments, the film, the powders or flakes and the method are in a preferred embodiment free of additives and the derivatization of the filaments. 1. Dry cellulose filaments comprisingat least 50% by weight of the filaments havinga filament length up to 350 μm; anda diameter of between 100 and 500 nm,wherein the filaments are re-dispersible in water.2. The filaments according to claim 1 , wherein at least 50% by weight of filaments comprising a filament length up to 350 μm; and a diameter of between 100 and 500 nm.3. The filaments according to claim 1 , that are free of additives.4. The filaments according to claim 1 , that are free of derivatization.5. The filaments according to claim 1 , wherein the filament length is between 300 and 350 μm.6. The filaments according to claim 1 , wherein the filaments are at least 80% by weight solids.7. (canceled)8. A film of dry cellulose filaments comprisingat least 50% by weight of the filaments having:a filament length up to 350 μm and a diameter of between 100 and 500 nm,wherein the film is dispersible in water.9. The film according to claim 8 , wherein the film has a range of thickness from 10 ...

METHOD FOR IMPROVING STRENGTH AND RETENTION, AND PAPER PRODUCT

A method for improving strength and retention in the manufacture of paper includes providing a composition containing microfibrillated cellulose in a fiber suspension, and from 0.1 to 10 w-% of microfibrillated cellulose by mass of the fiber suspension is added to improve the strength and retention of the product to be formed. A corresponding paper product is also provided. 1. A method for producing a product in papermaking comprising:adding a composition comprising anionically modified microfibrillated cellulose to a fiber suspension at a concentration of 0.1 to 10 wt-% anionically modified microfibrillated cellulose by weight of the fiber suspension to produce a modified fiber suspension; andforming the product from the modified fiber suspension,wherein adding the anionically modified microfibrillated cellulose to the fiber suspension improves the strength of the product.2. The method of claim 1 , wherein anionically modified microfibrillated cellulose is prepared by modifying and fibrillating cellulose or microfibril bundles comprising microfibrils.3. The method of claim 1 , wherein anionically modified microfibrillated cellulose is anionically modified nanofibrillated cellulose.4. The method of comprising adding 0.1 to 2 wt-% of the anionically modified microfibrillated cellulose to the fiber suspension.5. The method of comprising adding about 1 wt-% of the anionically modified microfibrillated cellulose to the fiber suspension.6. The method of claim 1 , wherein adding the anionically modified microfibrillated cellulose to the fiber suspension improves retention of the product.7. The method of claim 1 , wherein the fiber suspension comprises fiber based pulp formed by a chemical method claim 1 , a fiber based pulp formed by a mechanical method claim 1 , or a combination thereof.9. The method of further comprising adding one or more fillers to the fiber suspension.10. The method of claim 9 , wherein the one or more fillers comprises a cationic filler added to the ...

LAYERED TISSUE COMPRISING LONG, HIGH-COARSENESS WOOD PULP FIBERS

The present invention provides multi-layered tissue webs, and tissue product comprising the same, comprising long, high-coarseness wood pulp fibers selectively deposited in one or more outer layers of the multi-layered web. Surprisingly disposing long, high-coarseness wood pulp fibers in one or more outer layers, even in relatively modest amounts, may improve certain product properties, such as durability, without negatively affecting softness. In certain instances, both the softness and durability may be improved by selectively incorporating long, high-coarseness wood pulp fibers in one or more of the outer layers. 1. A tissue product comprising at least one multi-layered tissue web having a first and a second outer layer and a middle layer disposed there between , wherein the first and the second outer layers comprise from about 5 to about 20 weight percent (wt %) long , high-coarseness fiber having an average fiber length greater than about 2.0 mm and a coarseness of 20 mg/100 m or greater , the tissue product having a geometric mean tensile (GMT) from about 700 to about 1 ,200 g/3″ and a TS7 value less than about 12.0 dB Vrms.2. The tissue product of wherein the middle layer is substantially free from long claim 1 , high-coarseness fiber having an average fiber length greater than about 2.0 mm and a coarseness of 20 mg/100 m or greater.3P. taeda, P. elliotti, P. palustris, P. pungens, P. rigida, P. serotina, P. muricataP. radiata,. The tissue product of wherein the long claim 1 , high-coarseness fiber is derived from or and combinations thereof.4. The tissue product of wherein the long claim 1 , high-coarseness fiber has an average fiber length from about 2.0 to about 3.0 mm.5. The tissue product of having a GMT from about 700 to about 1 claim 1 ,000 g/3″ and a stiffness index from about 5.0 to about 8.0.6. The tissue product of having a GMT from about 700 to about 1 claim 1 ,000 g/3″ and a durability index greater than about 3.75.7. The tissue product of having ...

SHEET AND LAMINATE

An object of the present invention is to provide an ultrafine fiber-containing sheet, regarding which wrinkles and/or cracks generated upon sheet formation are suppressed, and a laminate thereof. According to the present invention, provided are: a sheet comprising ultrafine fibers having an ionic substituent and an organic ion that is a counterion of the ionic substituent, wherein the content of the organic ion is 0.40 mmol/g or less; and a laminate comprising the sheet and at least one of an inorganic layer and an organic layer formed on at least one side of the sheet. 114.-. (canceled)15. A sheet comprisingultrafine fibers having an ionic substituent, andan organic ion that is a counterion of the ionic substituent, whereinthe content of the organic ion is 0.40 mmol/g or less.16. The sheet according to claim 15 , which has a haze of 40% or less.17. The sheet according to claim 15 , which has a density of 1.0 g/cmor more.18. The sheet according to claim 15 , wherein the organic ion contains 4 or more carbon atoms.19. The sheet according to claim 15 , wherein the content of the ionic substituent is 0.5 mmol/g or less based on the ultrafine fibers.20. The sheet according to claim 15 , which has an elastic modulus in tension of 4.0 GPa or more at a temperature of 23° C. at a relative humidity of 50%.21. A laminate comprising{'claim-ref': {'@idref': 'CLM-00015', 'claim 15'}, 'the sheet according to , and'}at least one of an inorganic layer and an organic layer formed at least one side of the sheet.22. A sheet comprisingultrafine fibers having an ionic substituent, andan organic onium ion that is a counterion of the ionic substituent, whereinthe content of the organic onium ion is 0.10 mmol/g or more, whereinthe content of a phosphoric acid group and a phosphoric acid group-derived substituent is 0.1 mmol/g or more based on the ultrafine fibers, andthe ultrafine fibers do not comprise a carboxy group and a carboxy group-derived substituent, or the content of the carboxy ...

REDUCED FURFURAL CONTENT IN POLYACRYLIC ACID CROSSLINKED CELLULOSE FIBERS

Bleached polycrylic acid crosslinked cellulose fibers with reduced furfural content are disclosed. The reduced furfural content is accompanied by a strong reduction of malodor associated with crosslinked fibers. Methods of furfural reduction include treatment with hydrogen peroxide in the absence of alkaline or other bleaching agents subsequent to curing polyacrylic acid crosslinked cellulose fibers. Some embodiments of treated polycrylic acid crosslinked cellulose fibers have a furfural content lower than 1.3 ppm. In some embodiments, the reduction of furfural content of the treated crosslinked fibers compared to untreated crosslinked fibers is at least 55%. In some embodiments, furfural content decreases with aging of the treated crosslinked fibers. 1. A method of reducing the furfural content of polyacrylic acid crosslinked cellulosic fibers , the method comprising applying hydrogen peroxide alone , in a bleaching stage subsequent to a curing stage , to polyacrylic acid crosslinked cellulosic fibers , in an amount of from about 0.1 to about 20 pounds (about 0.045 to about 9.07 kg) per ADMT of fiber and at a pH of between about 4.5 and 5 , wherein the amount of furfural in the treated crosslinked fibers reduces from a first value determined at least one day after the treatment of the crosslinked fibers to a second , subsequent value determined up to 21 days after treatment.2. The method of claim 1 , wherein hydrogen peroxide is applied to the fibers in an amount of from about 3.0 to about 10 pounds (about 1.36 to about 4.54 kg) per ADMT fiber.3. The method of claim 1 , wherein hydrogen peroxide is applied to the fibers in an amount of about 5 pounds (2.27 kg) per ADMT fiber.4. The method of claim 1 , wherein the hydrogen peroxide is applied by spraying the hydrogen peroxide alone into an air stream containing the crosslinked fibers.5. The method of claim 1 , wherein the reduction of furfural from the first value to the second value is at least about 25%.6. The ...

PROCESS FOR THE MANUFACTURE OF PAPER AND PAPERBOARD

Process for the Manufacture of Paper and Paperboard The present invention relates to a process of making paper or paperboard in which a cellulosic thin stock is provided and subjected to one or more shear stages and then drained and a moving screen to form a sheet which is dried, wherein the process employs a retention system which is applied to the thin stock, said retention system comprising as components i) a blend of different cationic polymers and ii) a microparticulate material, in which the blend of cationic polymers comprises, a) a cationic polymer having a charge density of from 0.5 and below 3 mEq per gram and a molar mass of greater than 700,000 Da, which cationic polymer is selected from polymers containing vinyl amine units and polyethylenimine, b) a cationic polymer having a charge density of below 3 mEq per gram and an intrinsic viscosity of at least 3 dl/g, wherein one of the components of the retention system is dosed into the thin stock after the final shearing stage and the other is dosed into the thin stock before the final shearing stage. 1. A process of making paper or paperboard , comprising subjecting a cellulosic thin stock to one or more shear stages and then draining through a moving screen to form a sheet which is dried ,wherein the process employs a retention system which is applied to the thin stock, the retention system comprising as componentsi) a blend of different cationic polymers, andii) a microparticulate material,in which the blend of cationic polymers comprises:a) a cationic polymer having a charge density of from 0.5 and below 3 mEq per gram and a molar mass of greater than 700,000 Da, which cationic polymer is selected from polymers comprising vinyl amine units and polyethylenimine, andb) a cationic polymer having a charge density of below 3 mEq per gram and an intrinsic viscosity of at least 3 dl/g,wherein one of the components of the retention system is dosed into the thin stock after the final shearing stage and the other ...

RECOVERY METHOD FOR ORGANIC ACID, AND PRODUCTION METHOD FOR RECYCLED PULP

The purpose of the present disclosure is to provide a recovery method for an organic acid. The recovery method makes it possible to efficiently recover an organic acid that is included in a deactivating aqueous solution that includes excrement. This recovery method has the following features. A method for recovering an organic acid that deactivates a highly water-absorbent polymer that is included in used absorbent articles, the method being characterized by including: a deactivation step (S) in which the highly water-absorbent polymer is immersed in a deactivating aqueous solution that includes an organic acid and has a prescribed pH and the highly water-absorbent polymer is deactivated; a highly water-absorbent polymer removal step (S) in which the deactivated highly water-absorbent polymer is removed from the deactivating aqueous solution; a pH adjustment step (S) in which the deactivating aqueous solution is adjusted to a prescribed pH; a concentration step (S) in which the deactivation step (S), the highly water-absorbent polymer removal step (S), and the pH adjustment step (S) are repeated using deactivating aqueous solution that has gone through the pH adjustment step (S) and the organic acid in the deactivating aqueous solution is concentrated; and an organic acid recovery step (S) in which the organic acid is recovered from the deactivating aqueous solution. 1. A method of recovering an organic acid which inactivates superabsorbent polymers included in a used absorbent article , the method comprising:an inactivation step of inactivating the superabsorbent polymers by immersing the superabsorbent polymers in an inactivation aqueous solution which has a predetermined pH and includes an organic acid;a superabsorbent polymer removal step of removing the inactivated superabsorbent polymers from the inactivation aqueous solution which has been subjected to the inactivation step;a pH adjustment step of adjusting the inactivation aqueous solution which has been ...

FILAMENTS OF MICROFIBRILLATED CELLULOSE

A method is provided for preparing a fibrous material of crosslinked microfibrillated cellulose. Dialdehyde microfibrillated cellulose is spun into a fibrous material; said fibrous material is pre- or post-treated (by reduction of pH) to provide crosslinking between the dialdehyde microfibrillated cellulose. Fibrous materials such as filaments or mats, and polymer composites comprising such materials are also described. 1. A method for preparing a fibrous material of crosslinked microfibrillated cellulose , said method comprising the steps of:i. spinning a cellulose composition comprising dialdehyde microfibrillated cellulose (DA-MFC) into a fibrous material; and,ii. reducing the pH of said fibrous material to pH 7 or below, to provide cross-linking of the dialdehyde microfibrillated cellulose.2. The method according to claim 1 , additionally comprising the step of heat-treatment of said fibrous material claim 1 , concurrently or subsequently with the step of pH reduction.3. The method according to claim 2 , wherein said heat treatment takes place at a temperature of between 60 and 200° C.4. The method according to claim 2 , wherein said heat treatment takes place for a time of between 10 and 180 minutes.5. The method according to claim 1 , wherein the pH is reduced to below pH 6.5.6. The method according to claim 1 , wherein said fibrous material is filaments.7. The method according to claim 1 , wherein said fibrous material is a mat.8. The method according to claim 1 , wherein said cellulose composition additionally comprises unmodified microfibrillated cellulose.9. The method according to claim 1 , wherein said cellulose composition additionally comprises chemically-modified microfibrillated cellulose.10. The method according to claim 1 , wherein said cellulose composition comprises more than 25% by weight DA-MFC.11. The method according to claim 1 , wherein the crosslinking takes place in the absence of any additional crosslinking agents.12. The method according ...

METHOD FOR REDUCING THE VISCOSITY OF A NANOFIBRILLAR CELLULOSE HYDROGEL

The invention relates to a method for reducing the viscosity of a nanofibrillar cellulose hydrogel, wherein the method comprises mixing a nanofibrillar cellulose hydrogel with an aqueous growth medium for cell culture, wherein the aqueous growth medium contains one or more salts and optionally one or more sugars, using shearing forces so that a homogeneous dispersion is formed. The invention further relates to a dispersion comprising a nanofibrillar cellulose hydrogel and an aqueous growth medium for cell culture and to a use of an aqueous growth medium. 1. A method for reducing the viscosity of a nanofibrillar cellulose hydrogel , wherein the method comprises mixing a nanofibrillar cellulose hydrogel with an aqueous growth medium for cell culture , wherein the aqueous growth medium includes one or more salts and optionally one or more sugars , using shearing forces strong enough in order to disperse the nanofibrillar cellulose homogeneously in the mixture so that a homogeneous dispersion of the nanofibrillar cellulose is formed , wherein individual rafts of hydrogel are not observable visually or macroscopically in the homogeneous dispersion.2. The method according to claim 1 , wherein the method comprises mixing the nanofibrillar cellulose hydrogel with the aqueous growth medium using an apparatus selected from the group consisting of a blender claim 1 , a fluidizer claim 1 , a disperser and a homogenizer.3. The method according to claim 1 , wherein the aqueous growth medium comprises at least about 1-400 meq/l of ions of one or more salts.4. The method according to claim 1 , wherein the dispersion of the nanofibrillar cellulose hydrogel and the aqueous growth medium comprises about 10-400 meq/l of ions of one or more salts.5. The method according to claim 1 , wherein the aqueous growth medium comprises about 0.1-500 mmol/l of one or more sugars.6. The method according to claim 1 , wherein the dispersion of the nanofibrillar cellulose hydrogel and the aqueous ...

FILMS OF MICROFIBRILLATED CELLULOSE

A method is provided for preparing a film of crosslinked microfibrillated cellulose. Phosphorylated microfibrillated cellulose is cast or wet-laid into a film; and then said film is post-treated (e.g. by heat-treatment) to provide crosslinking between the phosphorylated microfibrillated cellulose. Films and hygiene products comprising such films are also described. 1. A method for preparing a film of crosslinked microfibrillated cellulose , said method comprising the steps of:i. casting or wet-laying a cellulose composition comprising phosphorylated microfibrillated cellulose (P-MFC) into a film, said cellulose composition additionally comprising unmodified microfibrillated cellulose, chemically-modified microfibrillated cellulose, or both; and,ii. heat-treatment of said film to provide crosslinking of the phosphorylated microfibrillated cellulose.2. The method according to claim 1 , wherein said cellulose composition comprises unmodified microfibrillated cellulose.3. The method according to claim 1 , wherein said cellulose composition comprises chemically-modified microfibrillated cellulose.4. The method according to claim 1 , wherein said cellulose composition comprises more than 25% by weight P-MFC.5. The method according to claim 1 , wherein said heat treatment takes place at a temperature of between 60 and 200° C.6. The method according to claim 1 , wherein said heat treatment takes place for a time of between 10 and 180 minutes.7. The method according to claim 1 , wherein the crosslinking takes place in the absence of any additional crosslinking agents.8. The method according to claim 1 , wherein said phosphorylated microfibrillated cellulose (P-MFC) is obtained by:providing a suspension of cellulose pulp fibers in water, andphosphorylating the cellulose pulp fibers in said water suspension with a phosphorylating agent, followed by fibrillation.9. The method according to claim 1 , further comprising the step of drying said film claim 1 , before the heat- ...

Modified fiber, methods, and systems

Methods of forming crosslinked cellulose include mixing a crosslinking agent with an aqueous mixture of cellulose fibers containing little to no excess water (e.g., solids content of 25-55%), drying the resulting mixture to 85-100% solids, then curing the dried mixture to crosslink the cellulose fibers. Systems include a mixing unit to form, from an aqueous mixture of unbonded cellulose fibers having a solids content of about 25-55% and a crosslinking agent, a substantially homogenous mixture of non-crosslinked, unbonded cellulose fibers and crosslinking agent; a drying unit to dry the substantially homogenous mixture to a consistency of 85-100%; and a curing unit and to cure the crosslinking agent to form dried and cured crosslinked cellulose fibers. Intrafiber crosslinked cellulose pulp fibers produced by such methods and/or systems have a chemical on pulp level of about 2-14% and an AFAQ capacity of at least 12.0 g/g.

Modified fiber, methods, and systems

Methods of forming crosslinked cellulose include mixing a crosslinking agent with an aqueous mixture of cellulose fibers containing little to no excess water (e.g., solids content of 25-55%), drying the resulting mixture to 85-100% solids, then curing the dried mixture to crosslink the cellulose fibers. Systems include a mixing unit to form, from an aqueous mixture of unbonded cellulose fibers having a solids content of about 25-55% and a crosslinking agent, a substantially homogenous mixture of non-crosslinked, unbonded cellulose fibers and crosslinking agent; a drying unit to dry the substantially homogenous mixture to a consistency of 85-100%; and a curing unit and to cure the crosslinking agent to form dried and cured crosslinked cellulose fibers. Intrafiber crosslinked cellulose pulp fibers produced by such methods and/or systems have a chemical on pulp level of about 2-14% and an AFAQ capacity of at least 12.0 g/g.

METHODS FOR PRODUCING A VISCOSE DOPE FROM MICROBIAL CELLULOSE

A method for producing a microbial cellulose pulp for the production of viscose dope, the method comprising the step of: exposing a microbial cellulose to a volume of water to form the microbial cellulose pulp for the production of viscose dope, wherein the cellulose concentration in the microbial cellulose pulp is less than 0.040 g of cellulose per mL of pulp. 1. A method for producing a microbial cellulose pulp for the production of viscose dope , the method comprising the step of:exposing a microbial cellulose to a volume of water to form the microbial cellulose pulp for the production of viscose dope, wherein the cellulose concentration in the microbial cellulose pulp is less than 0.040 g of cellulose per mL of pulp2. A method according to claim 1 , wherein after the step of exposing a microbial cellulose to a volume of water to form the microbial cellulose pulp claim 1 , the method comprises the step of:homogenising the microbial cellulose pulp.3. A method for producing a viscose dope claim 1 , the method comprising the steps of:exposing a microbial cellulose to a volume of water to form a microbial cellulose pulp for the production of viscose dope, wherein the cellulose concentration in the microbial cellulose pulp is less than 0.040 g of cellulose per mL of pulp;reacting the microbial cellulose pulp to produce a viscose dope.4. A method according to characterised in that claim 3 , prior to the step of reacting the microbial cellulose pulp to produce a viscose dope claim 3 , the method comprises the step of:homogenising the microbial cellulose pulp.5. A method according to characterised in that the step of homogenising the microbial cellulose pulp comprises the step of:homogenising the microbial cellulose pulp such that the particle size distribution of the particles of cellulose in the pulp has a D90 of less than 1700 μm, preferably less than 1500 μm, more preferably less than 1000 μm.6. A method according to or characterised in that the step of homogenising ...

Oxidized cellulose-containing fibrous materials and products made therefrom

The present invention relates to a cellulose-containing fibrous material, wherein hydroxy groups were oxidized at the C(6) of glucose units of the cellulose into aldehyde and/or carboxy groups, a paper or nonwoven (product) made therefrom, in particular tissue (products) and a process for their manufacture. The paper or nonwoven (products) of the invention display excellent strength properties.

Metal-crosslinkable oxidized cellulose-containing fibrous materials and products made therefrom

The present invention relates to crosslinked cellulose-containing fibrous material, wherein hydroxy groups are oxidized at the C(6) of glucose units of the cellulose into aldehyde and/or carboxy groups crosslinked with a metal-containing crosslinking agent selected from transition metals of groups IVa (preferably Zr), Va VIa, VIIa and VIIIa, aluminum and zinc; and a paper or nonwoven (product), e.g. tissue (product), which comprises this fibrous material. These paper or nonwoven (products) are distinguished by high wet and dry strength.

Method for Producing a Sheet Comprising Chemically Modified Cellulose Fibers

There is provided a method of producing a sheet having a density of 0.6-1.3 g/cmmeasured according to ISO 534:2011, the sheet comprising chemically modified cellulose fibres, wherein the method comprises: a. providing chemically modified cellulose fibres, wherein charge density measured according to SCAN-CM 65:02 of the chemically modified cellulose fibres is 1200-2400 μeq/g; b. forming a fibre web by dewatering a slurry comprising the chemically modified cellulose fibres on a forming wire; and c. drying the fibre web to obtain the sheet, with the proviso that no carboxymethyl cellulose (CMC) is added to the chemically modified cellulose fibres during or prior to step b. 1. A method of producing a sheet having a density of 0.6-1.3 g/cmmeasured according to ISO 534:2011 , the sheet comprising chemically modified cellulose fibers , wherein the method comprises:a. providing chemically modified cellulose fibers, wherein charge density measured according to SCAN-CM 65:02 of the chemically modified cellulose fibers is 1200-2400 μeq/g;b. forming a fiber web by dewatering a slurry comprising the chemically modified cellulose fibers on a forming wire; andc. drying the fiber web to obtain the sheet,with the proviso that no carboxymethyl cellulose (CMC) is added to the chemically modified cellulose fibres during or prior to step b.2. The method according to claim 1 , wherein the charge density measured according to SCAN-CM 65:02 of the chemically modified cellulose fibres is 1200-2000 μeq/g.3. The method according to claim 1 , further comprising adding a crosslinking agent comprising a divalent metal ion during or after step b claim 1 , which divalent metal ion may be selected from the group consisting of Zn claim 1 , Ca and Mg.4. The method according to claim 1 , wherein the chemically modified cellulose fibres constitutes at least 80 wt. % (dry) of the sheet.5. The method according to claim 1 , wherein the chemically modified cellulose fibers have undergone oxidation claim 1 ...

Ceramic foil and manufacture thereof

A ceramic foil comprising from 5 to 50% by weight (absolute dry weight) of a cation-modified pulp which has a degree of substitution of the cationic group from 0.02 to 0.04 and has been beaten to a freeness from 200 to 100 ml of C.S.F. and 50 to 95% by weight of fine, inorganic particles which are uniform and have been applied to the cation-modified pulp. This ceramic foil is easy to manufacture from an aqueous suspension of the cation-modified pulp and of the fine inorganic particles using a papermaking technique.

Multi-step catalytic carboxylation of mercerised cellulose fibres

FIELD: chemistry. SUBSTANCE: invention relates to chemical engineering of polymer fibres and multi-step catalytic carboxylation of mercerised cellulose fibres. Cellulose fibres have at least 12 meq/100 g of carboxyl substitution at the C-6 position of the anhydroglucose units, wherein cellulose includes at least 20% of cellulose II. Catalytic carboxylation of mercerised cellulose fibres is carried out in at least two catalytic carboxylation steps in a continuous sequence, where pH is controlled and at the beginning of each step a primary catalyst - oxoammonium salt or precursor thereof, and a secondary oxidant are added. Carboxylated mercerised cellulose can be obtained without aldehyde groups through a stabilisation step after the final carboxylation step, wherein aldehyde groups which are present in the fibres are converted to carboxyl groups. EFFECT: invention provides a high level of carboxylation. 20 cl, 1 dwg, 3 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 573 521 C2 (51) МПК C08B 15/04 (2006.01) D06M 11/40 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2014111256/05, 25.03.2014 (24) Дата начала отсчета срока действия патента: 25.03.2014 (72) Автор(ы): Уирэварна Ананда С. (US) (73) Патентообладатель(и): ВЕЙЕРХОЙЗЕР НР КОМПАНИ (US) Приоритет(ы): (30) Конвенционный приоритет: (43) Дата публикации заявки: 27.09.2015 Бюл. № 27 R U 29.03.2013 US 13/853,733 (45) Опубликовано: 20.01.2016 Бюл. № 2 2 5 7 3 5 2 1 R U (54) МНОГОСТАДИЙНОЕ КАТАЛИТИЧЕСКОЕ КАРБОКСИЛИРОВАНИЕ МЕРСЕРИЗОВАННЫХ ЦЕЛЛЮЛОЗНЫХ ВОЛОКОН (57) Реферат: Изобретение относится к химической последовательности, при которых регулируют технологии полимерных волокон и касается pH и в начале каждой стадии добавляют многостадийного каталитического первичный катализатор - оксоаммонийную соль карбоксилирования мерсеризованных или его прекурсор, и вторичный окислитель. целлюлозных волокон. Волокна целлюлозы Карбоксилированная мерсеризованная ...

一种正性光刻胶用纤维素基成膜树脂的制备方法

本发明公开了一种正性光刻胶用纤维素基成膜树脂的制备方法。采用方法的要点是以溶解浆纤维素为基础原料，对其进行酯化改性，制备环境友好的正性光刻胶用纤维素基成膜树脂。本发明在制备正性光刻胶用成膜树脂的原料中引入溶解浆纤维素，扩充了其原料范围，在保证成膜树脂良好性能的基础上，降低了正性光刻胶用成膜树脂的生产成本，提高了经济效益；同时有利于提升成膜树脂产品的生物可降解性，具有良好的经济和社会效益。

超疏水疏油透明纳米纤维素纸的制备方法

超疏水疏油透明纳米纤维素纸的制备方法，它涉及一种超疏水疏油且透明的纳米纤维素纸的制备方法。本发明是为了解决现有方法制备的疏水纳米纸不透明、疏水疏油性差的技术问题。本方法如下：一、纳米纤维素水液的制备；二、疏水物质的制备；三、纳米纤维素水液抽滤成膜；四、制备超疏水疏油透明纳米纤维素纸。本发明制备的超疏水疏油透明纳米纤维素纸的疏水接触角可以高达150°以上、滚动角小于10°，疏油接触角可以高达120°以上；可见光透过率高达80％；拉伸应力可达100MPa以上，最大热解温度可达350℃以上。本发明属于纳米纤维素纸的制备领域。

Composition of the processing cellulose fibre to produce the method for the composition containing microfibrillated cellulose and be produced according to the method

本发明涉及一种处理纤维素纤维的方法，所述方法包括如下步骤：提供含有纤维素纤维的浆料，在第一步中将具有高摩尔质量的阴离子聚丙烯酰胺(A‑PAM)加入浆料，和在第二步中使含有纤维和A‑PAM的浆料经历机械处理，从而形成含有微原纤化纤维素的组合物。本发明进一步涉及根据所述方法生产的组合物。

Method of preparing mercerised fibre

FIELD: chemistry. SUBSTANCE: method of preparing mercerised fibre involves treatment of cellulose fibre with a mercerising agent with large concentration of dissolved hemicellulose accumulated after continuous recycling of alkaline solutions or through addition of soluble carbohydrates, with concentration of alkali of approximately 5-15% of the total weight of the mixture. Temperature and period of time must be sufficient for preparation of mercerised cellulose fibres which form fibre fabric having air porosity equal to or greater than approximately 100 cubic feet in a minute per square foot, determined using the TAPPI T251 cm-85 at pressure of 125 Pa on hand moulding sheets 60 gcm. EFFECT: high porosity of material. 8 cl, 4 dwg, 2 tbl, 3 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 399 708 (13) C2 (51) МПК D21C 9/00 (2006.01) D21H 15/04 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (30) Конвенционный приоритет: 29.10.2004 US 60/623,677 (73) Патентообладатель(и): ИНТЕРНЭШНЛ ПЭЙПА КАМПАНИ (US) (43) Дата публикации заявки: 27.11.2008 2 3 9 9 7 0 8 (45) Опубликовано: 20.09.2010 Бюл. № 26 (56) Список документов, цитированных в отчете о поиске: US 3340139 А, 05.09.1967. GB 1024096 А, 30.03.1966. US 2004/206464 A1, 21.10.2004. SU 1087526 A1, 23.04.1984. RU 2018558 C1, 30.08.1994. RU 2202558 C2, 27.09.2001. 2 3 9 9 7 0 8 R U (86) Заявка PCT: US 2005/038960 (28.10.2005) C 2 C 2 (85) Дата перевода заявки PCT на национальную фазу: 17.05.2007 (87) Публикация PCT: WO 2006/050111 (11.05.2006) Адрес для переписки: 125009, Москва, а/я 184, ППФ "ЮС", пат.пов. С.В.Ловцову, рег. № 59 (54) СПОСОБ ИЗГОТОВЛЕНИЯ МЕРСЕРИЗОВАННЫХ ВОЛОКОН (57) Реферат: Способ изготовления мерсеризованных волокон содержит по существу обработку целлюлозных волокон мерсеризующим агентом с большой концентрацией растворенных гемицеллюлоз, накопившихся после непрерывной рециркуляции щелочных растворов или путем добавления растворимых ...

Production of microfibrillar cellulose

FIELD: process engineering. SUBSTANCE: proposed method comprises preprocessing of fibre by enzyme in first enzymatic treatment whereat enzyme features activity of 0.01-250.0 ncat/g. Then, fibre is subjected to first mechanical processing and second enzymatic processing whereat enzyme features activity of 50-300 ncat/g. Note here that activity of enzyme during second enzymatic processing exceeds that during first enzymatic processing. Fibre is subjected to second mechanical processing to get microfibrillar cellulose. EFFECT: perfected process, lower costs. 8 cl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (51) МПК D21H 11/20 (13) 2 535 685 C2 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2012103987/05, 02.07.2010 (24) Дата начала отсчета срока действия патента: 02.07.2010 Приоритет(ы): (30) Конвенционный приоритет: (43) Дата публикации заявки: 20.08.2013 Бюл. № 23 (73) Патентообладатель(и): СТОРА ЭНСО ОЙЙ (FI) R U 07.07.2009 SE 0950535-5 (72) Автор(ы): ХЕЙСКАНЕН Исто (FI), БАКФОЛЬК Кай (FI), ВЕХВИЛЯЙНЕН Марианна (FI), КАМППУРИ Таина (FI), НОУСИАЙНЕН Пертти (FI) (45) Опубликовано: 20.12.2014 Бюл. № 35 01/96402 A1, 20.12.2001. WO 2004055268 A1, 01.07.2004. US 6425975 B1, 30.07.2002. US 5129987 A, 14.07.1992. RU 2278914 C2, 27.06.2006 (86) Заявка PCT: IB 2010/053044 (02.07.2010) C 2 C 2 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 07.02.2012 (87) Публикация заявки PCT: 2 5 3 5 6 8 5 WO 2011/004301 (13.01.2011) R U 2 5 3 5 6 8 5 (56) Список документов, цитированных в отчете о поиске: WO 2007091942 A1, 16.08.2007. WO Адрес для переписки: 129090, Москва, ул. Б. Спасская, 25, строение 3, ООО "Юридическая фирма Городисский и Партнеры" (54) СПОСОБ ИЗГОТОВЛЕНИЯ МИКРОФИБРИЛЛИРОВАНОЙ ЦЕЛЛЮЛОЗЫ (57) Реферат: Изобретение относится к обработке активностью 50-300 нкат/г, и активность целлюлозного волокна, включающей фермента во время второй ферментативной предварительную обработку волокна ферментом ...

Superabsorbent cellulosic fiber and method of making same

本发明涉及超吸收剂纤维素纤维，它包括纤维素和至少一种烯键式不饱和单体。本发明还涉及生产该超吸收剂纤维的方法，和含该超吸收剂纤维的吸收剂制品。

Filter sheet

A filter media sheet comprising fine particulate and a self-bonding matrix of cellulose fiber, the surfaces of at least one of which are modified with a polyamido-polyamine epichlorhydrin cationic resin, the matrix incorporating beaten cellulose fiber to provide a Canadian Standard Freeness of less than 600 ml.

Enzymatic treatment of pulp to increase strength

Filter with inorganic cationic colloidal silica

ABSTRACT A filter media sheet comprising fine particulate and a self-bonding matrix of cellulose fiber, the surfaces of at least one of which are modified with cationic colloidal silica.

Wood Particles, Manufacturing Method for paper of using the Same

본 발명은 표백된 목분을 천연펄프에 혼합하여 종이를 제조하도록 함으로써 탈수성을 향상시키는 한편 펄프의 사용량을 줄여 저렴하고 고품질의 종이를 제공하도록 하는 표백목분을 이용한 종이 및 그 제조방법에 관한 것이다. 본 발명은 목재료를 분쇄하고 건조한 후 일정크기 이하로 분급하여 정선하는 과정을 거치고, 정선된 목분을 표백제와 함께 투입하여 일정시간 교반시킴으로써 표백이 이루어지게 하고, 표백된 목분은 연마가공과 분급 및 정선과정을 거쳐 표백목분을 얻도록 하고, 상기 표백목분 5-20중량%는 천연펄프 80-95중량%에 혼합한 후 종이제조 과정을 거쳐 종이를 제조하는 것이다. The present invention relates to a paper using bleached wood flour and a method for producing the same, which improves dehydration by mixing bleached wood flour into natural pulp to reduce the amount of pulp used while providing paper of low cost. In the present invention, the wood material is pulverized, dried and classified to a predetermined size or less, and then selected, and the selected wood flour is added with a bleach to stir for a certain time, and the bleached wood flour is subjected to grinding and classification and Through the selection process to obtain bleached wood powder, 5-20% by weight of the bleached wood powder is mixed with 80-95% by weight of natural pulp, and then through the paper manufacturing process to produce a paper.

Pressed product in wet condition in form of toilet paper and towels with increased coefficient of elongation in cross-section direction and low strength ratio value, made with application of creping process on tissue at high solid substance content

FIELD: medicine. SUBSTANCE: absorbing cloth from a cellulose fiber contains an admixture of hard wood and soft wood fibers located in the form of mesh structure, including: the set of columnar areas fibers conglomeration with relatively high local density, aggregated by means of set of the connecting areas with lower local density, where orientation of fibers is inclined along a longitudinal direction between the columnar areas interconnected in a such way, where the cloth possesses coefficient of elongation in a cross-section direction, which is at least in 2.75 times higher than relative strength at cloth stretching in a dry condition. The above-stated material is obtained as follows. A water cellulose composition from hard wood fibers is prepared. The composition is moved on a forming tissue in the form of a stream which is let out from a pressure head box with a flow rate. The composition is dehydrated and compacted for manufacturing of a paper for formation of the fibrous layer possessing chaotic distribution of a fiber for paper manufacturing. Packing of the dehydrated fibrous layer possessing chaotic distribution of a fiber on the transporting transferring surface moving with the first rate. Creping of a fibrous layer from the transferring surface on a tape at dryness from 30% to 60% with use of the pattern creping tape. The creping stage is carried out under pressure in a contact zone of the creping tape confined between the transferring surface and the creping tape. Thus the tape is moved with the second speed, lower than speed of the transferring surface. Tape drawing, parametres of a contact zone, speed difference and dryness of the fibrous layer are chosen in such way to crepe the fibrous layer at its removal from the transferring surface and to redistribute on the creping tape with formation of a fibrous layer with mesh structure. Drying of the fibrous layer is performed after. The process is regulated so that coefficient of elongation in a cross- ...

Process for Improving Cellulosic Material

종이 제품, 티슈, 수건, 타올 등에서의 습식 강도, 유연성, 흡수성, 흡수율 등은 제지 공정에서 단량체 또는 중합체 양이온성 첨가제와 결합된 카르복시메틸 셀룰로오스 물질을 포함하는 셀룰로오스 물질을 사용하여 개선시킬 수 있다. 본 발명의 방법은 섬유 표면 카르복시메틸화 및 수성 배지에 이어서 다양한 조건하에 개질 섬유를 양이온성 첨가제와 혼합하는 것과 티슈 및 타올 생성물을 습윤 형성시키는 단계를 포함한다. 첨가제는 통상 바람직하게는 셀룰로오스 표면에서 카르복시메틸기와 결합되는 양이온성 첨가제이다. 중합체 또는 단량체 첨가제 중 양전하의 양이온기들간의 카르복시메틸 셀룰로오스 개질 섬유 중 음전하 카르복실기에 대한 친화성은 종이 제품의 다양한 특성을 개선시킨다.