Advanced dewatering system

Application of the invention is based on the date of application to 21 March 2007, application number 200580003697.7 (International application number: PCT/EP2005/050198), title of invention is:of "advanced dewatering system" applied for Patent application.

Technical Field

The present invention relates to paper-making machine, more specifically, relates to the advanced dewatering system of a paper machine. The invention also provides method for producing a thin sheet of paper web (tissue) or toilet paper method and device, the ventilation drying method compared with (TAD method), and in respect of investment cost and the operation cost of, the tissue paper or toilet paper web of low price. The method of the invention can conveniently used for retrofitting existing (retrofit) end of a paper machine and can also be used for new machine. This method can be compared to purchase new TAD more low cost of the machine. The water absorbent and made of paper thickness of the paper web in the method for manufacturing the quality of paper similar to TAD.

Background Art

In the operation of the wet, fiber web (fibrous   web   sheet) paper in the nip press (nip) flowing out from the web to the water pressure to drive. It has been recognized that, conventional wet pressure law is inefficient, when only a portion of the performance part roller week used for processing the paper web. In order to overcome this limit, some attempts have been carried out, the solid impermeable pressing paper web and with suitable for dewatering the web in the extended nip press. The method has the problems that the problem is not permeable with prevent the drying fluid (such as air) through the flow of the paper web. Extended nip press (ENP) belt throughout the paper industry the sheath in the nip in the actual press in the method of dwell time. Shoe press (  press shoe) is through with a fixing block of the ENP belt throughout the belt provide a device capable of applying pressure, the fixed block is configured to be press hard surface such as the curvature of the solid roller. Through this way, the tissue paper, the nip can be extended 120 mm, for even paperboard can be extended up to 250 mm, exceed the limit of contact between the rollers. In the shoe press, ENP belt is used as the roll mantle. The use of fuel injector (oil   shower) lubricating the flexible band so as to prevent friction damage inside. The belt and a shoe press is non-permeability element, the dehydration of the web to their almost only by the mechanical press and realize.

In the prior art, have already known to use the ventilation drying method for drying (TAD) paper web, especially thin paper web, in order to reduce the mechanical press. However, huge TAD cylinder and complex air supply and the heating system is necessary. Yankauer is transferred to the paper web in the dryer before (Yankee   Cylinder), the system needs to be high in order to realize the operating cost of necessary dryness of the paper web, the drying cylinder the web drying to final drying of about 96%. The drying cylinder surface, by means of a scraper (  doctor creping) creping.

The TAD system is very expensive, the cost of conventional thin sheet of paper is usually two times of a paper machine. And, high operation cost, because the purposes of drying efficiency, the use of TAD method needs the paper web drying to higher than the use of the ventilation system of the drying level. Therefore, the reason for this is that in low drying level of the system and produce TAD humidity distribution CD (moisture   profile). In up to 60% of the high drying level, only CD humidity distribution is acceptable. At greater than 30% when, by means of a drying cylinder cover/Yankauer dryer (Hood/Yankee) penetration drying (  drying impingement) greater efficiency.

Conventional tissue paper production method of the quality of the paper web is as follows: the production of thin page is smaller than the bulk density of paper paper 9 cm³/g. Production of thin page retaining property paper paper (use measuring basket type law) less than 9 (g H₂ O/g fiber).

However, TAD system leading to the advantages of a higher-quality paper web, in particular, has high bulk density 10-16 and water retention properties 10-16. Because of having such high bulk density , large diameter roll (jumbo   roll) of the weight of the conventional large-diameter roll is almost a 60%. Taking into account the 70% of the cost of making the investment of the machine is and textile fiber TAD machine than about 40%, the potential of the design is apparent.

WO   03/062528 (and the corresponding United States Patent application discloses No.US   2003/0136018, its content by reference herein all the special incorporates), for example, discloses a three-dimensional surface structure manufacturing method of the paper web, wherein the paper web with improved paper thickness and water-absorbent. The literature discuss the use of the special design of the advanced dewatering system for dewatering the need of improvement. The system uses belt-type press, during the dehydration thereof to exert load on the back of the structured fabric. The structured fabric is permeable, and may be a permeable ENP belt, so as to promote the simultaneous vacuum and press dewatering. However, this system is limited, for example, lack of point (open   area) of the split.

WO   03/062528 the wet molding disclosed in the standard has taught the crescent forming apparatus structured fabric to run the press fabric, as manufactured three-dimensional surface structure of the web a part of the manufacturing method.

TAD drum and the function of the ventilation system includes a drying the web, because of this reason, the above-mentioned alternative drying device (pressure field, and 3rd) is preferred, since the 3rd pressure force field can be a lower cost than TAD to or included in the conventional machine.

In order to achieve the desired dryness, according to the method disclosed in a favourable embodiment, the suction roll is provided with at least one of the foam layer of the blanket (felt) is used for dewatering a paper web. On this point, can be specifically selected froth multiple coat , so that the average pore diameter is about 3 to about 6 the  m. Therefore the corresponding capillary action used for dehydration. As the blanket to be provided with a special foam layer, which is a surface with a very small hole, the diameter of the hole is about 3 to about 6 the  m. The air permeability of this felt is very low. The natural capillary action is used in contact with the paper web and felt dewatering a paper web.

According to the disclosed method a favourable embodiment, the so-called SPECTRA the membrane and is used for dewatering a paper web, the laminated film preferably SPECTRA or fixed to the air on the doors, and this SPECTRA film preferably with conventional, in particular woven fabric (woven   fabric) for using. The literature also discusses the use of a wet film against again.

The inventor has noted that, in these the proposal of the use of the special designed dewatering fabric improved dewatering method, the benefits, however, is not sufficient to support the high-speed operation. What is needed is a more efficient dewatering system, this is precisely the subject of the present invention.

Content of the invention

The invention aims at improving the overall efficiency of drying method, make it possible to realize higher machine speed and the rate of speed of the machine close to the existing TAD. The invention also provides a pressure increase of the pressure field 3, in other words, the backbone dry area press device, so as to leave the area of the paper sheet or paper web (sheet) solid content will not adversely affect the quality of the paper sheets.

The invention relates to advanced dewatering system (ADS). Also relates to a method for drying a paper web, in particular to the use of any number of fabric or tissue paper method and device for toilet paper web. The invention also uses the drying device (for example, suction roll) on the permeability of the fabric and/or permeable extended nip press (ENP) belt. The system uses pressure and around the suction roll can be used for the dewatering of the paper web dewatering fabrics. In order to the new use of these characteristics, in order to produce high quality tissue paper or toilet paper web.

Permeable extended nip press (ENP) belt may include at least one (at   least   one) spiral chain belt (spiral   link   belt). At least one spiral seamed fabric (  fabric spiral   link) can be an opened area is about 30% to about 85%, and at least one spiral seamed fabric of the contact zone can be about 15% to about 70%. Opening can be about 45% to about 85%, the contact zone can be about 15% to about 55%. Opening can be about 50% to about 65%, the contact zone can be about 35% to about 50%.

The invention at least one of the main aspects of a method of de-watering is to make the sheet. The paper sheet is conveyed to the main pressure field on the structured fabric, with the special design where the dehydration of the contact of the fabric, the fabric around and/or the crossing set up and operation of the water (for example, around the suction roll). The negative pressure applied at the back of the fabric, so that the gas stream is first flows through the structured fabric then flow through the web, then flow through the special designed dewatering fabric, into the water-absorbing device.

Dewatering fabric or in the non-restrictive examples are as follows. A preferred structure is the traditional aculeus press fabric (  press   punched   fabric needle), with multi-layer rod-shaped fiber (  fiber bat), wherein the rod-shaped fiber is about 0.5 dtex (dtex) to about 22 sub-extra. Dewatering fabric can include a combination of different dtex fibers. Its also preferably contains a binder, in addition to fiber-fiber or fiber-substructure (base cloth (base cloth)) or particle-fiber or particle-substructure (base cloth) adhesive, such as low-melting-point fibers (low   melt fibers) or particles and/or resin treating agent (resin   treatments). Through the use of equal to or greater than the of the total weight of the fabric of about 1%, preferably equal to or greater than about 3%, most preferably equal to or greater than about 5% of the adhesive, and to bond the molten fiber can be accepted. These molten fiber, for example, can be composed of one component or can contain two or more components. All of these fiber has a different shape, and at least one of these components can be compared with the standard material for the cloth substantially lower melting point. Dewatering fabric may be a thin structure, its thickness is preferably less than approximately 1.50 mm, more preferably less than approximately 1.25 mm, most preferably less than about 1.0 mm. Dewatering fabric can include weft yarns, it can be usually twisted/plied multifilament yarn (plied) of (multifilament   yarns). The weft yarns can also be solid composed of (  mono strand solid), its diameter is generally less than about 0.30 mm, preferably less than about 0.20 mm, low up to about 0.10 mm. The weft yarns can be a single yarn, preventing twisted yarn from crinkle or cable, or combined side by side (  side joined   by   side), or flat. Dewatering fabrics can also use the warp yarn, a monofilament, and the diameter is about 0.30 mm to about 0.10 mm. They can be twisted or monofilament, the diameter is preferably about 0.20 mm. Dewatering fabric may be needled with a straight-through drainage channel, can it is preferred to use a generally uniform needling. Dewatering fabric can also include applying on a surface of the fabric of the optionally a hydrophobic thin layer, the air permeability (  perm air) is about 5 to about 100cfm, preferably about 19cfm or more, the most preferably about 35cfm or more. An average pore diameter is about 5 to about 75 microns, preferably about 25 microns or more, more preferably about 35 microns or more. Dewatering fabrics can be composed of various kinds of synthetic polymer material or even wool made, for example, preferably made of polyamide, for example nylon 6 is made.

Dewatering fabrics alternative structure can be laminated on a woven base cloth against again wet level. The base cloth is about 0.10 mm to about 0.30 mm, preferably from about 0.20 mm diameter monofilament warp (on a paper machine of the yarn across the machine direction) and is usually twisted/plied multifilament yarns of the combination of an endless woven structure (woven   endless   structure). The yarn may also be a solid single yarn, its diameter is generally less than about 0.30 mm, preferably less than about 0.20 mm, low up to about 0.10 mm. The weft yarns can be a single yarn, preventing twisted yarn from crinkle or cable, or combined side by side, or a flat (on a paper machine in the machine direction of the yarn). The bottom cloth (  fabric base) can be laminated on the against again wet level , the latter is preferably elastic body casting permeability thin film (thin   elestomeric   cast   permeable   membrane). The permeability can be the thickness of the film is about 1.05 mm, preferably less than approximately 1.05 mm. The elastic body is cast film through the provision of air the purpose of the buffer layer in order to delay in return water flow, thereby preventing the sheet re-wet, before the water reaches the paper because of the need to make the air movement. Laminating method can be through the elastic body into the woven base cloth membrane fusion in the front or through the needling two or less thin layers of the rod-shaped fiber, wherein two or less rod-shaped fiber sheet is located in the back, so as to be connected together the two layers. In on said surface can be applied optionally a hydrophobic thin layer. The optional level air permeability is about 130cfm or less, preferably about 100cfm or less, the most preferably about 80cfm or more small. With the average pore diameter can be about 140 microns or smaller, more preferably about 100 microns or smaller, most preferably from about 60 microns or smaller.

Dewatering fabric another alternative structure of the use of anti-re-wet film, which comprises a laminated in the perforated hydrophobic film woven multifilament thin weaving on, its air permeability is 35cfm or more small, preferably 25cfm or more small, the average pore diameter of 15 microns. According to the present invention another preferred embodiment, dewatering fabrics is a flocculent layer blanket. The bottom layer the diameter of the flocculent fibers of the fabric is equal to or less than about 11 dtex, preferably equal to or less than about 4.2 dtex, more preferably equal to or less than about 3.3 dtex. Flocculent fiber can also be a fiber blend (blend). Dewatering fabric can also contain vector layer (  layer vector), it contains about 67 dtex fiber, and can contain even more coarse fiber (  fiber even   courser), for example, has about 100 dtex, about 140 dtex the minute counts especially of or even higher. For the good water absorption is important. Dewatering fabrics of the flocculent layer fabric and/or dewatering the wet surface itself can be equal to or greater than about 35 m²/m² blanket area, is preferably equal to or greater than about 65m²/m² blanket area, most preferably equal to or greater than about 100m²/m² blanket area. The coefficient of the surface of the dewatering fabric should be equal to or greater than about 0.04m²/g blanket weight, is preferably equal to or greater than about 0.065m²/g blanket weight, most preferably equal to or greater than about 0.075m²/g blanket weight. For the good water absorption is important. Dynamic rigidity K* [N/mm] as the value of the compressibility is less than or equal to 100, 000N/mm is acceptable, the preferred compressibility is less than or equal to 90, 000N/mm, the tray can be pressed and the most preferably less than or equal to 70, 000N/mm. Dewatering fabrics compressibility (force caused by changes in the thickness of the, mm/N) is higher than the upper fabric. In order to make the web effectively dehydrated to the high drying level, this is also important.

Dewatering fabric may also be it is preferred to use a vertical flow channel. Through these channels can be printed on the fabric and polymer material. They can be by the use of low-melting of the yarn produced special woven pattern, the yarn then heat forming the channel and the air (air   block) in order to prevent leakage. These structures can be needle punched, in order to offer the surface enhancement and abrasion resistance.

The fabric used for the dewatering fabric can also be in its has been combined with the knocking in the machine so as to stitch/combining. Machine stitched on the/binding does not hinder dehydration process.

Described in this application the surface of the dewatering fabric can be modified to change the surface energy. Also they can hinder the flow in the plane of the Z direction only thereby facilitate the flow.

The invention also provides for drying a tissue paper or toilet paper web of the system, wherein the system includes a drying device for paper web across the permeable structured fabric, is guided across the contact paper and the permeability of the drying device for dewatering fabrics, also includes the drying device used for the permeable structured fabric, the web and the permeable dewatering fabric device for exerting pressure.

The invention also utilizes the following facts: fiber (mass   of   fibers) is still being structured fabric (valley (valley)) protection, and the structured fabric (valley) between the vertical with only minor pressen. These valley is not very deep, so as to avoid plastic deformation of the paper fiber and avoid adversely affect the quality of paper; but also is not very shallow, so as to accept from the corpus fibrosum an excess of water. Of course, this depends on the dewatering fabric softness, compressibility and elastic.

Permeable structured fabric may comprise a permeable extended nip press (ENP) belt, the drying device may include a water absorbing or vacuum roller. Drying apparatus can include water absorbing roller. Drying apparatus can include a suction box. The drying device can be used to apply a vacuum to the surface of permeable dewatering fabric or negative pressure, said surface and the contact of the paper web relative to the surface of the permeable dewatering fabric. The system can be structured and arranged to cause air flow first flows through the permeable structured fabric, then flow through the web, then flow through the permeable dewatering fabric and into the drying device.

The permeable dewatering fabric can include multi-layer rod-shaped fiber needled press fabric (press fabric). Permeability dehydration including having multi-layer wherein the rod-shaped fiber needled press fabric, wherein the rod-shaped fiber is about 0.5 minute especially to approximately 22 dtex. Permeable dewatering fabric can include a combination of different dtex fibers. According to the present invention another preferred embodiment, permeability dewatering fabrics is a flocculent layer blanket (batt   layer). Underlayer fabric (  fabric lower) the flocculent fiber (  fiber batt) is equal to or less than about the diameter of the 11 dtex, preferably equal to or less than about 4.2 dtex, more preferably equal to or less than about 3.3 dtex. The fiber can also be a blend of fibers. Permeable dewatering fabric can also contain vector layer, it contains about 67 dtex fibers, the fabric can also contain even more coarse fiber, it has example as promised 100 decitexes, about 140 dtex the minute counts especially of or even higher. For the good water absorption is important. The flocculent layer permeable dewatering fabric and/or permeability of the wet surface of the dewatering fabric itself can be equal to or greater than about 35m²/m² blanket area, is preferably equal to or greater than about 65m²/m² blanket area, most preferably equal to or greater than about 100m²/m² blanket area. The coefficient of the surface of the permeable dewatering fabric should be equal to or greater than about 0.04m²/g blanket weight, is preferably equal to or greater than about 0.065m²/g blanket weight, most preferably equal to or greater than about 0.075m²/g blanket weight. For the good water absorption is important. Dynamic rigidity K* [N/mm] as the value of the compressibility is less than or equal to 100, 000N/mm is acceptable, the preferred compressibility is less than or equal to 90, 000N/mm, the tray can be pressed and the most preferably less than or equal to 70, 000N/mm. Permeable dewatering fabric compressibility (force caused by changes in the thickness of the, mm/N) is higher than the upper fabric. In order to make the web effectively dehydrated to the high drying level, this is also important.

Permeable dewatering fabric also containing flock fibers and a binder, in addition to fiber-fiber bonding. Permeable dewatering fabric can include comprises a low-melting-point fibers or particles and resin at least one kind of treatment flocculent fiber. The thickness of the permeable dewatering fabric may be less than about 1.50 mm. The thickness of the permeable dewatering fabric may be less than about 1.25 mm. The thickness of the permeable dewatering fabric may be less than about 1.00 mm.

Permeable dewatering fabric can include weft yarns. The weft yarns may include twisted multifilament yarn of or plied. The weft yarns may comprise solid composed of, its diameter is less than about 0.30 mm. The weft yarns may comprise solid composed of, its diameter is less than about 0.20 mm. The weft yarns may comprise solid composed of, its diameter is less than about 0.10 mm. The weft yarns may comprise one of the following: single yarn, twisted yarn, cable gauze , parallel combined yarn, and the yarn is usually flat.

Permeable dewatering fabric can include warp. The warp yarns may include monofilament yarn, its diameter is about 0.30 mm to about 0.10 mm. The warp yarns may include a diameter of about 0.20 mm is a twisting or monofilament. Permeable dewatering fabric may be needled and can include straight-through drainage channel. Permeable dewatering fabric may be needled and the use is generally uniform needling. Permeable dewatering fabric can include applying the bottom cloth and on the surface of the bottom cloth hydrophobic thin layer. Permeable dewatering fabric air permeability can be about 5 to about 100cfm. Permeable dewatering fabric air permeability can be about 19cfm or higher. Permeable dewatering fabric air permeability can be about 35cfm or higher. Permeable dewatering fabric can be an average pore diameter of about 5 to about 75 microns. Permeable dewatering fabric can be an average pore diameter of about 25 microns or more. Permeable dewatering fabric an average pore diameter can be about 35 microns or more.

Permeable dewatering fabric can include at least one synthetic polymer material. Permeable dewatering fabric can include wool. Permeable dewatering fabric may comprise a polyamide material. Polyamide material may be a nylon 6. Permeable dewatering fabric can include the laminated to the woven base cloth against again wet level. The woven base cloth may include an endless woven structure, the structure comprises a diameter of from about 0.10 mm to about 0.30 mm monofilament warp, the diameter can be about 0.20 mm. The woven base cloth may include an endless woven structure, which comprises twisting or stock of the multifilament yarn. The woven base cloth may include an endless woven structure, which comprises a diameter of less than about 0.30 mm of solid composed of multifilament yarn. Solid composed of the diameter can be about 0.20 mm diameter. Solid composed of the diameter can be about 0.10 mm diameter.

The woven base cloth may include an endless woven structure, its include weft yarns. The weft yarns may comprise one of the following: single yarn, twisted yarn or cable gauze , parallel combined yarn, and the yarn a flat shape. Permeable dewatering fabric can include anti-rewet layer and the tail. Anti-re-wet casting permeability of the elastic body can be a thin film. Elastic body casting permeability the thickness of the film can be equal to or less than about 1.05 mm. Elastic body casting permeability film can be adjusted is adapted to form an air buffer layer, so as to delay the water flow in the convex. Anti-re-wet and a base cloth layer can be connected to each other through the laminate.

The invention also provides for connecting the above-mentioned anti-re-wet method and a base cloth layer, wherein the method comprises the elastic body casting permeability film fusing into the bottom fabric layer. The invention also provides for connecting the above-mentioned types of against again wet level and a base cloth layer method, wherein the method comprises in the front surface of the tail (face side) needling two or less thin layers of a bar-shaped fiber, there are two or less rod-shaped fiber layer is located on the back side of the tail. The method further comprises connecting the hydrophobic thin layer to the at least one surface.

The present invention also provides a system for drying a paper web, wherein the system (over) includes a carrying the paper web roll across the permeable structured fabric, and contact the paper web is guided across the permeability of vacuum dewatering fabrics, for in the vacuum roller and the permeable structured fabric, the web and the permeable dewatering fabric device for exerting pressure.

The apparatus may include produces an over-voltage of the drying cylinder cover. The apparatus may include a belt press (belt press). Can include a permeable belt of the belt press. The invention further provides a method of drying of a web of the above-mentioned system, wherein the method comprises moving the paper web of permeable structured fabric across the vacuum on, the permeability of the guide contact with the web over the vacuum dewatering fabric, the permeability in the vacuum roller structured fabric, the web and the permeable dewatering fabric mechanical pressure is applied, and during the use of vacuum pressure to the permeable structured fabric, the web and the permeable dewatering fabric absorbent.

And non-dependent on the mechanical block is used for pressing, the invention allows the use of permeable belt as a pressing element (pressing   element). The tension thus form with the suction roll belt press. This allows a longer nip, that is, approximately ten times, this results in a peak pressure is very low, in other words, about 20 times, it has to allow the air to flow through the paper web and the advantages of the nip itself, however, the common shoe press this is not the case. The low peak pressure of the air stream and on the soft surface of the fabric, minor pressen and dehydration also takes place in the structured fabric in the protected areas between the dots, however, is not very deep, so as to avoid fiber sheet plastic deformation and avoid the deterioration in quality of the sheet.

The invention also provides special design of the permeable ENP belt, it can be used in advanced dewatering system of the belt-type press machine structured fabric or paper web that is formed on the device. The permeable ENP belt also can be used in a no press/low press Tissue in   Flex and method for use with fabric and stitching.

The invention also provides high strength permeable press belt, in this belt and with the side surface of the opening.

A form of this invention comprises a belt-type press, which comprises having an outer surface and the outer surface of a part of a roller press contact (  contact pressing) of the side of the permeable belt. The tension applied on the permeability of at least about 30KN/m. The open side of the permeable belt is at least about 25%, a contact area of at least about 10%, preferably at least 25%.

The advantage of this invention lies in allowing the flow through in order to reach the web is large, by vacuum, particularly in the pressing operation in removing water.

Another advantage is that the permeable belt can exert considerable tension.

A further advantage is that owing to permeability with one side thereof adjacent to the contact region of the split of the considerable.

Compared with the standard shoe press, another of the present invention advantage is that the permeable belt special long extended nip applying linear pressure (  force line), thereby ensuring that the very long period of time, the time the pressure is applied to the paper web.

The present invention also provides a belt press for a paper machine, wherein the belt press comprises includes the outer surface of the roller. Permeable belt is guided to the surface of the 1st crossed the roller part of an outer surface of the. The permeable belt tension of at least about 30KN/m. 1st surface of the opening of at least about 25%, a contact area of at least about 10%, preferably at least about 25%.

1st surface toward the outer surface of the can, the expression force is applied can be permeable belt roller (pressing   force). Permeable belt may comprise through hole. Permeable belt as a usual can include arranging the rules of the through hole of the symmetrical patterns (pattern). Permeability of the tape may include generally parallel several row of through holes , by doing this, each of the rows of through holes along the machine-direction orientation. Permeable belt about the rollers 30KPa to about 150KPa pressure. Permeable belt may comprise through hole and a plurality of grooves, each groove with different through hole group cross. 1st surface facing the outer surface of the, permeable belt pressure is applied to the rollers. The plurality of grooves on the surface can be arranged in the 1st. In the each of the plurality of grooves having a width a, each of the through-holes can be having a diameter, wherein the diameter is greater than the width.

The tension of the strip of greater than about 50KN/m. Rollers can be contacted each other comprises a vacuum roller. Rollers can be contacted each other includes a internal circumferential part of the vacuum roller. Can include at least one roll is arranged on the internal circumferential part of the vacuum zone. The stick to the rollers can be contacted each other includes a vacuum roller. Stick can include about 200 mm to about 2,500 mm the circumferential length. Circumferential length can be about 800 mm to about 1,800 mm. The circumferential length may be about 1,200 mm to about 1,600 mm. Permeable belt may comprise a polyurethane wide pressure zone and spiral seamed fabric (  fabric spiral   link) at least one of. Permeable belt may comprise a polyurethane wide pressure zone, which comprises embedding the yarn in the strong [...]. Strong [...] yarn can include a plurality of machine direction yarns and a plurality of transverse yarn. Permeable belt may comprise a polyurethane wide pressure zone, which comprises embedding the yarn in the strong [...] , the a plurality of reinforcing yarns in woven spiral chain manner. Permeable belt may comprise a spiral suture fabric.

Belt press can further include in the permeability and low force between operation of the fabric and 1st 2nd fabric. 1st 2nd 1st surface and having a fabric surface. 1st 1st surface of the fabric at least in part the outer surface of the contacting roller of the. 1st 2nd surface of the fabric of the web to at least a portion of the contact surface of the 1st. 2nd and 1st 2nd having a fabric surface. 2nd 1st surface of the fabric with a permeability of at least a portion of the contact surface of the 1st. 2nd 2nd surface of the fabric of the web to at least a portion of the contact surface of the 2nd.

1st permeability fabric can include removing hose. 2nd fabric can include a structured fabric. A fiber web can include tissue paper web or toilet paper web. The invention also provides a fiber material drying device, comprising a guide crossed the roller the endless permeable extended nip press (ENP) belt. ENP belt by at least about 30KN/m tension. ENP belt with opening area of at least about 25%, the contact zone is at least about 10%, preferably at least about 25% of the side. 1st fabric also can be a seamed fabric.

The invention also provides permeable extended nip press (ENP) belt, it can bear at least about 30KN/m tension, wherein the permeable ENP belt comprises at least one side surface, the side wall includes at least about 25% of the opening regions and at least about 10%, preferably at least about 25% of the contact area.

Can be defined by the through hole opening, defined by the plane of contact. Opening regions can be defined by the through hole, contact area is formed by the no opening, defining the plane of the recess or groove. Opening regions can be formed by through hole and a groove is defined, a contact hole, dent or a groove defined the plane of the. Permeable ENP belt may comprise a spiral suture fabric. At this time, opening regions can be about 30% to about 85%, the contact zone can be about 15% to about 70%. Preferably, opening regions can be about 45% to about 85%, the contact zone can be about 15% to about 55%. Most preferably, opening regions can be about 50% to about 65%, the contact zone can be about 35% to about 50%. Permeable ENP belt can be arranged in the through hole of the generally symmetrical pattern. The permeable ENP belt can be arranged relative to the machine direction generally parallel to the through hole of the plurality of rows. Permeable ENP belt may comprise an endless circulating belt.

Permeable ENP belt may comprise through hole, and the permeable ENP belt may comprise at least one side of a plurality of grooves, the plurality of grooves each of the different through hole group cross. In the each of the plurality of grooves having a width a, each of the through-holes can be having a diameter, wherein the diameter is greater than the width. In the plurality of grooves each extend into the permeable ENP belt, the quantity is less than the thickness of the permeable belt.

Tension can be greater than about 50KN/m. Permeable ENP belt may comprise a flexible reinforced polyurethane element. Permeable ENP belt may comprise a flexible spiral seamed fabric. Permeable ENP belt may comprise a flexible polyurethane element, a plurality of reinforcing yarns embedded therein. Strong [...] yarn can include a plurality of machine direction yarns and a plurality of transverse yarn. Permeable ENP belt may comprise a flexible polyurethane material and strong [...] yarn embedded therein, said plurality of reinforcing yarn is woven in a spiral manner.

The invention also provides a method of pressing the fiber web in the paper machine, wherein the method includes a portion of the permeable belt by means of the web to exert pressure on the contact, wherein the contact zone is at least the portion of the area of about 10%, preferably at least about 25%, and the fluid to flow through said states the permeability flows through the web and with the opening, wherein the opening of said part at least about 25%, wherein the pressure and flow period, said permeable belt tension of at least about 30KN/m.

Can include contact of the web with the web compared with the non-contact zone is more area of the portion of the press. Partially permeable tape may include no opening, concave or substantially flat surface of the groove, it is guided to pass through a roller. The fluid may include air. The permeable belt may comprise through hole and a groove which are open. Tension can be greater than about 50KN/m.

The method may further include rotating roller along the machine direction, wherein the with states the permeability synergistic play with the rollers is guided over the roller or the roller guide. Permeable belt may include a plurality of grooves and the through hole, each of the plurality of grooves is arranged on one side of the permeable belt and with different through hole group cross. Pressure and motion can be continuously a certain residence time, said residence time sufficient to produce about 25% to about 55% of the solid content of the fiber web. Preferably, the solid content can be greater than about 30%, most preferably more than about 40%. These solid content can be obtained, in the use of belt press or the permeable belt has no press/low press device using permeable belt in. Permeable belt may comprise a spiral suture fabric.

The invention also provides a method of pressing the fiber web in the paper machine, wherein the method comprises using the permeable belt 1st 1st part of the web to exert pressure, and by permeable belt of the web to the press part to part of the 2nd 2nd application of a relatively large pressure, wherein the partial area of 2nd to 1st part of the area of at least about 10%, preferably at least about 25%, and the air flows through the open part of the strip states the permeability , wherein the area of the open part 1st and 2nd is applied with the pressure of the press part of the permeability of at least about 25%, wherein the pressure and flow period, said permeable belt tension of at least about 30KN/m.

Tension can be greater than about 50KN/m. The method further includes rotating roller along the machine direction, wherein with the rollers with states the permeability cooperative movement. The area of the open part can be at least about 50%. The area of the open part can be at least about 70%. Larger 2nd pressure can be about 30KPa to about 150KPa. Flow and pressure can be substantially carried out at the same time.

The method can further include the air flows through a fiber web reaches a certain residence time, said residence time sufficient to produce about 25% to about 55% of the solid content of the fiber web.

The present invention also provides in the belt press method for drying of the web, said belt press comprises a roller and the permeable belt comprising through holes, wherein the through hole area is permeable belt squeezing part of the area of the of at least about 25%, and wherein the permeable belt tension of at least about 30KN/m, wherein the method comprises guiding at least the pressing portion of the permeable belt crossed the roller , the fiber in roller and permeable belt movement between the press section, the web of at least about 10%, preferably at least about 25% is generated by the pressure of the part of the permeable belt, said permeable belt portion adjacent the through hole, and the fluid flows through the permeable belt and the through hole of the fiber.

The present invention also provides in the belt press method for drying of the web, said belt press comprises a roller and with the permeability of the through hole and the groove, wherein with the area of the through holes of the press part of the permeability of the area of at least about 25%, and wherein the permeable belt tension of at least about 30KN/m, wherein the method comprises guiding at least the pressing portion of the permeable belt crossed the roller , the fiber in roller and permeable belt movement between the press section, the web of at least about 10%, preferably at least about 25% is generated by the pressure of the part of the permeable belt, said permeable belt with the through hole and a groove adjacent part, and the fluid flows through the permeable belt and a groove and the through hole of the fiber.

According to another aspect of the invention, provide more effective dehydration method, is preferably used for tissue paper production method, in which the paper web to obtain up to about 40% of the drying degree. The method of the present invention is mechanical and the operation cost is low, and provides with the TAD by the same method as the quality of the paper web. According to the present invention the production of tissue paper web is greater than the bulk density of about 10 cm³/g, up to about 14 to about 16 cm³/g. According to the present invention the production of thin-page paper water retention performance (by measuring basket type law) greater than about 10 (g   H₂ O/g fiber), as high as about 14 (g H₂ O/g fiber) to 16 (g   H₂ O/g fiber). This also enables the entire drying process more effectively.

The invention also provides effective dewatering apparatus, the method can be used in combination with a TAD.

The present invention provides for the quantitative less than about 42g/m² tissue paper web (preferably used for tissue paper) of the new dehydration method. The invention also provides a device for using the method, also provides is used for the key to this method the function of the component.

Major aspects of the present invention is a press system, comprising at least one upper layer of the fabric (or 1st), at least a lower layer of the fabric (or 2nd) and the assembly of the paper web therebetween. 1st pressure generating element of the at least one contact surface of the upper fabric. 2nd supporting structure of the contact surface of the fabric and at least one lower layer is permeable. The surface of the 1st and 2nd the difference holds the attention of the audience is arranged between, the at least one upper fabric, at least one lower fabric and arrangement of the assembly of the paper web therebetween exerts, thus in the assembly and therefore generating the mechanical pressure on the paper webs. The mechanical pressure in the paper web to produce a predetermined water pressure, the water contained in the discharged through the. An upper fabric than the degree of roughness of the lower layer fabric large and/or compressibility more high. From the at least one upper fabric to the at least one lower fabric caused by the direction of air flow, flows through at least one of the upper fabric, at least one lower fabric and arrangement of the assembly of the paper web therebetween.

Also provides different possible mode and the additional characteristic. For example, the permeability of the fabric can be an upper layer, and/or so-called "structured fabric". By means of non-restrictive example, an upper fabric can be, for example, TAD fabric, membrane, fabric, printed film or printed fabric. A lower fabric may include a permeability is connected with the bottom cloth and the grid (  grid lattice), which consists of a polymer such as polyurethane. The grating side of the fabric in contact with a suction roll, contact with opposite sides of the paper web at the same time. The grid can also be in order to horizontally relative to the machine direction yarns and any angular orientation of the yarn. The permeability of the fabric is at the end, the grid can be rewet layer. Grid also can be made of composite material, for example made of elastomeric material. Grille itself can include the machine direction yarns, wherein the composite material is formed around these yarns. By means of the above-mentioned types of fabric, or generates an independent can be formed in the surface structure of the woven pattern.

An upper fabric can be transmitted to the web press system or web from the press system. In the upper layer of the fabric web may be in the three-dimensional structure, so it is not straight, but is a three-dimensional structure, the paper web (bulky) takamatsu is thick of forming the same. A lower fabric is also permeable. A lower fabric design enable it to water storage. A lower fabric also has a smooth surface. A lower fabric is preferably a blanket of flocculent layers. The lower the diameter of the flocculent fibers of the fabric is equal to or less than about 11 dtex, preferably equal to or less than about 4.2 dtex, more preferably equal to or less than about 3.3 dtex. Flocculent fiber can also be a blend of fibers. A lower fabric can also contain vector layer, it contains about 67 dtex fibers, the fabric can also contain even more coarse fiber, it has example as promised 100 decitexes, about 140 dtex the minute counts especially of or even higher. For the good water absorption is important. A lower fabric of the fabric and/or lower layers of the flocculent layer of the wet surface itself can be equal to or greater than about 35m²/m² blanket area, is preferably equal to or greater than about 65m²/m² blanket area, most preferably equal to or greater than about 100m²/m² blanket area. The coefficient of the surface of the lower layer fabric should be equal to or greater than about 0.04m²/g blanket weight, is preferably equal to or greater than about 0.065m²/g blanket weight, most preferably equal to or greater than about 0.075m²/g blanket weight. For the good water absorption is important. Dynamic rigidity K* [N/mm] as the value of the compressibility is less than or equal to 100, 000N/mm is acceptable, the preferred compressibility is less than or equal to 90, 000N/mm, the tray can be pressed and the most preferably less than or equal to 70, 000N/mm. A lower fabric compressibility (force caused by changes in the thickness of the, mm/N) higher. In order to make the web effectively dehydrated to the high drying level, this is also important. Hard surface does not press the upper layer of fabric between the structured surface of the paper web of vertical. On the other hand, the blanket should not be pressed into the three-dimensional structure is too deep, so as to avoid fiber sheet plastic deformation and to avoid loose and quality of the (loose) a spool, such as water retention properties.

An upper fabric compressibility (by the pressure caused by the change of the thickness of the, mm/N) is lower than the lower fabric. Dynamic rigidity K* [N/mm] compressibility of the fabric as the value of the upper layer can be greater than or equal to 3,000 N/mm and lower than the lower fabric. For maintaining the three-dimensional structure of the web, that is, to ensure that the upper chord is an important structure is rigid.

The elasticity of the lower layer fabric should be taken into account. The compressibility of the dynamic modulus G* [N/mm²] as the lower layer of the fabric is greater than or equal to the elastic value 0.5N/mm² is acceptable, preferably elastic is greater than or equal to 2N/mm², most preferably elastic is greater than or equal to 4N/mm². The density of the lower layer fabric should be equal to or greater than about 0.4g/cm³, is preferably equal to or greater than about 0.5g/cm³, ideally is equal to or greater than about 0.53 g/cm³. When the paper web rate greater than about 1000m/min of this is advantageous. The reduction of the size of the blanket so that the water is easy to be airflow to discharge the blanket, i.e., the water flow through the blanket. Therefore, dehydration effect is small. The lower layer can be lower than the permeability of the fabric about 80cfm, preferably less than about 40cfm, ideally equal to or less than about 25cfm. Permeability is reduced so that the water is easy to be airflow to discharge the blanket, i.e., the water flow through the blanket. As a result, re-wetting is very small. However, the permeability is too high will be too open structure causes the air flow rate is too high, for a given vacuum pump and the smaller the vacuum degree, and the poorer the dehydration effect of the blanket.

Supporting structure of straight surface may be a 2nd and/or the plane of the (flat). On this point, the surface of the support structure is composed of the straight cap 2nd can be formed. 2nd surface of the supporting structure of which can be preferably is curved. For example, 2nd surface of the support structure can be in the suction roll or cylinder are formed or crosses the suction roll or cylinder, for 200 the wide or [...] 1.75m wide machine, suction roll or diameter, for example of the cylinder is about g.t. 1m or more. Water-absorbing device or cylinder may include at least one stick. It also may include two or more of the stick. Water-absorbing drum can also include absorbing water arc with at least one of the at least one suction box. At least one mechanical pressure zone can be formed by at least one pressure field (that is, by means of the tension of the belt) or for example by means of a pressing element is formed on the surface of via the 1st. 1st surface infiltration strip can be, however, an opening surface of the fabric toward the 1st, such as fluted or slotted opening surface drills blindly , air can flow from outside the suction arc. 1st the surface can be a permeable belt. The stated opening regions can be at least about 25%, preferably greater than about 35%, most preferably greater than about 50%. With the contact zone can be at least about 10%, at least about 25%, preferably up to about 50%, of the press which has a good contact.

Furthermore, can be pressure by the pressure element, such as a shoe press or a roller press. This has the following advantages: if not require very high loose cardboard site, then by carefully adjusting the mechanical pressure load, the selection can be used for increasing the dryness and thus increase the output to the desired value. Since the 2nd fabric is comparatively soft, the three-dimensional structure of the paper web (valley) between the dots at least partially by the press. Preferably in stick (no longer wet) before, after or between additional pressure field is arranged. The upper layer of the permeable belt designed to be able to resist greater than about 30KN/m, preferably about 60KN/m or higher, such as about 80KN/M large tension. By using this tension, the generated pressure is greater than about 0.5 bar, preferably about 1 bar or higher, can be example as promised 1.5 bar. According to the known formula p=S/R, depends on the tension of the pressure "P" "S" and "R" the radius of the suction roll. To a larger tension roller in order to achieve the objectives given pressure. The upper chord can also be stainless steel and/or metal and/or polymer with. Permeability the upper chord can be made of reinforced plastic or synthetic material. It may also be a spiral suture fabric. Preferably, the belt can be driven in order to avoid the 1st and 2nd shearing force between the fabric and the web. Suction roll can also be driven. These components can be independently driven.

1st surface can be to provide the perforations of the pressure load with the permeability of the block support.

Air flow can be formed by non-mechanical pressure field the following form: the use of the negative pressure in the suction box of the suction roll or the use of straight suction water tank, or using, for example, the drying cylinder cover caused by the pressure of the element on the surface of the 1st overvoltage, the pressure generating element in the air supply, such as about 50 the [...] to about 180 the hot air [...] , preferably about 120 the [...] to about 150 the [...] , also preferably steam. If the leave the headbox of the paper pulp temperature of less than about 35 the [...] , such a high temperature is particularly important and preferred. This is not a grinding slurry (stock refining) or low level of raw material in the production method of the purification. Of course, can make the above-mentioned all or part of the characteristic.

The pressure in the drying cylinder cover can be less than about 0.2 bar, preferably less than about 0.1, most preferably less than about 0.05 bar. The supply of air to the drying cylinder cover can be less than the flow rate through the vacuum pump is equal to or, preferably, the rate of absorbing water from the suction roll. By means of non-restrictive example, is supplied to the drying cylinder cover of the width of the air flow of each meter to the velocity of flow can be approximately under atmospheric pressure 140m³/min. The temperature of the air flow can be about 115 the [...]. The use of vacuum pump will be the velocity of flow can be drawn out of the suction roll is about 500m³/min, in 25 the vacuum under [...] is about 0.63 pakistani.

Suction roll can be fabric and pressure generating element, such as wrapped with the assembly of the, by the 2nd fabric has a largest package radin " a1   arch area[...] and finally leave. Paper web and is 2nd 1st to leave with fabric, leaving the first pressure generating element. The radian of the pressure generating element is greater than of the radian. This is important, because of the low degree of dryness, mechanical dewatering than airflow dewatering more effective. A small water absorption radin " a2   [...] should be large enough to ensure that the air current has sufficient retention time in order to reach maximum drying degrees. Dwell time "T" should be greater than about 40ms, preferably greater than about 50ms. For approximately 1.2m of about roller diameter 1200m/min the purposes of the machine speed, radians " a2   [...] should be greater than about 76 degrees, preferably greater than about 95 degrees. Formula is:a2= [retention time * rate * 360/roller perimeter of].

2nd fabric can be, for example, added to the overflow nip (flooded   nip   shower) the bottom of the steam in the water heating or processing, in order to improve the dewatering performance. High temperature so that the water is easy to flow through the blanket. The tape can also be a heater or dryer cover or steam box heating. Particularly in the former thin sheet of paper when the paper machine is a former double net , TAD-fabric can be heated. This is because, if the shaping device is lunular shaper, the TAD fabric forming the package will be therefore and roller headbox injected the slurry heating.

The method described herein have many advantages. In the prior art in the TAD method, needs to be 10 a vacuum pump to the paper web drying to about 25% of the drying degree. On the other hand, the advanced dewatering system of the invention, only 6 a vacuum pump the paper web drying to about 35%, and, the TAD method of the prior art, must use the TAD drum and drying paper to approximately air system 60% to about 75% of the high drying level, otherwise they will be adverse moisture transverse distribution. This way waste of a great amount of energy and only the small capacity uses the Yuncker type dryer/dryer cover. The system of this invention can make the paper web is dried in the 1st step to about 30% to about 40% of the specific drying level, has good lateral distribution of the water. In the 2nd step, the system of this invention can be used with combined conventional Yuncker type dryer the drying increases to greater than about 90% of the final drying degrees. Generating the drying level of a method can include with the aid of the Yuncker type drying cylinder of the drying cylinder cover for more effective drying.

The present invention also provides a belt press for a paper machine, wherein the belt press comprises includes the outer surface of the roller. The permeable belt is guided crossed the roller 1st surface of a part of the outer surface. The permeable belt tension of at least about 30KN/m. 1st surface of the opening of at least about 25%, a contact area of at least about 10%, preferably at least about 25%. Permeability of the paper web running between the external surface of and low force.

1st surface facing the outer surface of the can, the expression force is applied can be permeable belt roller. Permeable belt may comprise through hole. Permeable belt of the usual rules may include a symmetrical pattern is arranged. Permeability of the tape may include generally parallel several row of through holes , several rows of the through holes along the machine-direction orientation. The permeable belt package is about the expression force is of 30Kpa to about 150KPa. Permeable belt may comprise through hole and a plurality of grooves, each groove with different through hole group cross. 1st surface can be facing the outer surface, wherein the states the permeability the expression force is applied to the rollers. A plurality of grooves can be arranged in the 1st surface. The plurality of grooves may each having a width, wherein each through hole has a diameter, wherein the diameter is greater than said width. May be greater than the tension of the strip about 50KN/m. May be greater than the tension of the strip about 60KN/m. May be greater than the tension of the strip about 80KN/m. Rollers can be contacted each other comprises a vacuum roller. Rollers can be contacted each other includes a internal circumferential part of the vacuum roller. Can include at least one roll is arranged on the internal circumferential part of the vacuum in. The stick to the rollers can be contacted each other includes a vacuum roller. The length of the circumference of the stick can be about 200 mm to about 2,500 mm. Circumferential length can be about 800 mm to about 1,800 mm. The circumferential length may be about 1,200 mm to about 1,600 mm.

The invention also provides a fiber material drying device, comprising a guide crossed the roller the endless permeable extended nip press (ENP) belt. ENP belt by the tension of at least about 30KN/m. ENP belt comprises at least about 25% of the opening regions and at least about 10%, preferably at least 25% of the side of the contact zone. ENP belt and rollers in the paper web running.

The invention also provides permeable extended nip press (ENP) belt, it is able to bear the tension of at least about 30KN/m, wherein the permeable ENP belt comprises at least about 25% of the opening regions and at least about 10%, preferably at least 25% of at least one side of the contact zone.

Opening regions can be defined by the through hole, can be defined by the plane of contact. Opening regions can be defined by the through hole, the contact zone can be formed by not opening, defining the plane of the recess or groove. Opening regions can be formed by through hole and a groove is defined, a contact area can be formed by not opening, defining the plane of the recess or groove. ENP belt may comprise a spiral suture fabric. Permeable ENP belt may include a symmetrical pattern usually arranged. Permeable ENP belt may comprise relative to the machine direction which is typically arranged in parallel the through hole of the plurality of rows. Permeable ENP belt may comprise an endless circulating belt. Permeable ENP belt may comprise through hole, permeable ENP belt may comprise at least one side of the plurality of grooves, the plurality of grooves each of the different through hole group cross. The plurality of grooves may each having a width, wherein each through hole has a diameter, wherein the diameter is greater than said width. In the plurality of grooves each extend into the permeable ENP belt, the quantity is less than the thickness of the permeable belt. Tension can be greater than about 50KN/m. Permeable ENP belt may comprise a flexible spiral seamed fabric. Permeable ENP belt may comprise at least one spiral seamed fabric. At least one spiral seamed fabric can include synthetic material. At least one spiral seamed fabric may comprise stainless steel. Permeable ENP belt may comprise a permeable fabric, which is formed by at least one spiral link belt reinforced.

The invention also provides the method of drying of a web in the device, wherein the method comprises to enable the arrangement of at least one of the at least one fabric and 1st 2nd fabric web between the support surface and the movement between the pressure generating element, and the fluid to flow through said web, at least one fabric and 1st and 2nd the support surface of the fabric.

The present invention also provides a belt press for a paper machine, wherein the belt press comprises having an outer surface and at least one stick to the vacuum roll. The permeable belt is guided over the surface of the 1st of the roll a part of the outer surface. The permeable belt tension of at least about 30KN/m. 1st surface of the opening of at least about 25%, a contact area of at least about 10%, preferably at least about 25%. Permeability of the paper web running between the external surface of and low force.

The at least one of the length of the circumference of the stick can be about 200 mm to about 2,500 mm. The circumferential length may define a of about 80 degrees to about 180 degrees of arc. The circumferential length may define a of about 80 degrees to about 130 degrees of arc. At least one stick for applying can be adjusted is equal to or more than approximately the vacuum reaches 40ms of the residence time. Residence time can be equal to or greater than about 50ms. states the suction roll can be permeable belt to the applied pressure to be equal to or greater than about 40ms of dwell time of 1st. At least one stick for applying can be adjusted is equal to or more than approximately the vacuum reaches 40ms of dwell time of 2nd. 2nd dwell time can be equal to or greater than about 50ms. 1st dwell time can be equal to or greater than about 50ms. Permeable belt may comprise at least one spiral seamed fabric. At least one spiral seamed fabric can include synthetic material. At least one spiral seamed fabric may comprise stainless steel. At least one spiral suture tension of the fabric can be about 30KN/m to about 80KN/m. Tension can be about 35KN/m to about 50KN/m.

The invention also provides for and method of drying of a web, wherein the method comprises using the pressure generating element pressen in at least one of the at least one fabric and 1st 2nd of the paper web of fabric, at the same time the fluid to flow through said web and at least one of the 1st and 2nd fabric.

Pressen can be equal to or greater than about 40ms of the residence time. Residence time can be equal to or greater than about 50ms. The flow can be carried out at the same time is equal to or greater than about 40ms of the residence time. Residence time can be equal to or greater than about 50ms. Pressure generating element may include a device for applying a vacuum. Vacuum may be greater than about 0.5 bar. Vacuum may be greater than about 1 bar. Vacuum can be greater than about 1.5 bar.

The use of the system of this invention, does not need drying. The use of the system of this invention, the drying of about 35% to greater than about 90% of the solid content of the more effective in the overall drying capacity, TAD machine and of the paper of the same quality.

The invention comprises the following elements:

1. For drying a tissue paper or toilet paper web of the system, including:

Drying device for carrying paper web across the permeable structured fabric;

The contact paper and is guided across the permeable dewatering fabric drying device; and

The drying device used for the permeable structured fabric, the web and the permeable dewatering fabric device for exerting pressure.

2. Section 1 of the system, wherein the permeable structured fabric is TAD fabric, and wherein the drying device comprises a water absorbing roller.

3. Section 1 of the system, wherein the drying device comprises a water absorbing roller.

4. Section 1 of the system, wherein the drying device comprises a suction box.

5. Section 1 of the system, wherein the drying device to the permeable dewatering fabric vacuum or negative pressure applied to the surface of, said surface and the contact of the paper web relative to the surface of the permeable dewatering fabric.

6. Section 1 of the system, wherein the structuring and arrangement of the system, in order to cause air flow through the permeable structured fabric at first, then by the paper webs, through the permeable dewatering fabric and into the drying device.

7. Section 1 of the system, wherein the permeable dewatering fabric includes at least one smooth surface.

8. Section 7 of the system, wherein the permeable dewatering fabric comprises a blanket of flocculent layers.

9. Section 8 of the system, wherein the flocculent fiber flocculent layer can be the following one of the diameter of the: equal to or less than 11 dtex; equal to or less than 4.2 dtex; equal to or less than 3.3 dtex.

10. Section 7 of the system, wherein the permeable dewatering fabric includes one of the following: flocculent fiber blend; vector layer, the vector layer contains equal to or greater than about 67 dtex fiber.

11. Section 7 of the system, the coefficient of the surface of the permeable dewatering fabric comprising one of the following: greater than or equal to 35m²/m² blanket area; is equal to or greater than 65m²/m² blanket area; and equal to or greater than 100m²/m² blanket area.

12. Section 7 of the system, the coefficient of the surface of the permeable dewatering fabric comprising one of the following: greater than or equal to 0.04m²/g blanket weight; is equal to or greater than 0.065m²/g blanket weight; and equal to or greater than 0.075m²/g blanket weight.

13. Section 7 of the system, wherein the density of the permeable dewatering fabric comprising one of the following: greater than or equal to 0.4g/cm³; is equal to or greater than 0.5g/cm³; and is equal to or greater than 0.53g/cm³.

14. Section 1 of the system, wherein the permeable dewatering fabric includes a combination of different dtex fibers.

15. Section 1 of the system, wherein the permeable dewatering fabric comprises flock fibers and a binder, is used for additional fiber-fiber bonding.

16. Section 1 of the system, wherein the permeable dewatering fabric comprises flock fibers, which comprises a low-melting-point fibers or particles and resin at least one kind of a treatment agent.

17. Section 1 of the system, wherein the thickness of the permeable dewatering fabric less than about 1.50 mm.

18. Section 17 of the system, wherein the permeable dewatering fabric a thickness of less than about 1.25 mm.

19. Section 1 of the system, wherein the permeable dewatering fabric a thickness of less than about 1.00 mm.

20. Section 1 of the system, wherein the permeable dewatering fabric include weft yarns.

21. Section 20 of the system, including the weft yarn twisting of the multifilament yarns or plied.

22. Section 20 of the system, including the weft yarn diameters of less than about 0.30 mm solid single strand of yarn.

23. Section 22 of the system, including the weft yarn diameters of less than about 0.20 mm solid single strand of yarn.

24. Section 22 of the system, including the weft yarn diameters of less than about 0.10 mm solid single strand of yarn.

25. Section 20 of the system, wherein the weft yarn comprises one of the following: single strand of yarn, twisted yarn, cable, parallel combined yarn, and the yarn is usually flat shape.

26. Section 1 of the system, wherein the permeable dewatering fabric comprises warp.

27. Section 26 of the system, wherein the yarn comprises monofilament yarn, its diameter is about 0.30 mm to about 0.10 mm.

28. Section 26 of the system, wherein, the warp comprises twisting or single thread, its diameter is about 0.20 mm.

29. Section 1 of the system, wherein the permeable dewatering fabric is needle, and including a straight-through drainage channel.

30. Section 1 of the system, wherein the permeable dewatering fabric is needle, and the use is generally uniform needling.

31. Section 1 of the system, wherein the permeable dewatering fabric which comprises a bottom cloth and applied to the surface of hydrophobic thin layer.

32. Section 1 of the system, wherein the permeable dewatering fabric air permeability is about 5 to about 100cfm.

33. Section 32 of the system, wherein the permeable dewatering fabric air permeability is about 19cfm or higher.

34. Section 33 of the system, wherein the permeable dewatering fabric air permeability is about 35cfm or higher.

35. Section 1 of the system, wherein the permeable dewatering fabric for an average pore diameter of about 5 to about 75 microns.

36. Section 35 of the system, wherein the permeable dewatering fabric for an average pore diameter of about 25 microns or more.

37. Section 35 of the system, wherein the permeable dewatering fabric an average pore diameter is about 35 microns or more.

38. Section 1 of the system, wherein the permeable dewatering fabric includes at least one synthetic polymer material.

39. Section 1 of the system, wherein the permeable dewatering fabric includes wool.

40. Section 1 of the system, wherein the permeable dewatering fabric includes polyamide material.

41. Section 40 of the system, wherein the polyamide material is nylon 6.

42. Section 1 of the system, wherein the permeable dewatering fabric includes laminated on a woven base cloth on against again wet level.

43. Section 42 of the system, wherein the woven fabric comprises an endless woven structure, which comprises a diameter of from about 0.10 mm to about 0.30 mm monofilament warp.

44. Section 43 of the system, wherein the diameter is about 0.20 mm.

45. Section 42 of the system, wherein the woven fabric comprises an endless woven structure, which comprises a twisted multifilament yarn of or plied.

46. Section 42 of the system, wherein the woven fabric comprises an endless woven structure, which comprises a multifilament yarn, said yarn is that the diameter is less than about 0.30 mm solid single strand of yarn.

47. Section 46 of the system, wherein a solid composed of a diameter of about 0.20 mm.

48. Section 46 of the system, wherein a solid composed of a diameter of about 0.10 mm.

49. Section 1 of the system, wherein the woven fabric comprises an endless woven structure, its include weft yarns.

50. Section 1 of the system, wherein the weft yarn comprises one of the following: single strand of yarn, twisted yarn or cable, parallel combined yarn, and flat yarn.

51. Section 1 of the system, wherein the permeable dewatering fabric includes a base cloth layer and anti-rewet layer.

52. Section 51 of the system, wherein the anti-rewet layer includes elastic body casting permeability thin film.

53. Section 52 of the system, wherein the elastic body casting permeability the thickness of the film is equal to or less than about 1.05 mm.

54. Section 52 of the system, wherein the elastic body casting permeability film is adapted to form an air buffer layer, so as to delay the water flow in the convex.

55. Section 51 of the system, by laminating and a base cloth layer against again wet level of them are connected with each other.

56. Used for connecting the section 55 against again wet level and tail of the method, the method includes the elastic body casting permeability film fusing exactly in the layer.

57. Used for connecting the section 55 against again wet level and tail of the method, the method comprises in the front surface of the tail needling two or less thin layers of a bar-shaped fiber, and of two or less rod-shaped fiber layer is located on the back of the tail.

58. Section 57 method, further comprises connecting the hydrophobic thin layer to the at least one surface.

59. Section 1 of the system, wherein the permeable dewatering fabric air permeability is about 130cfm or more small.

60. Section 59 of the system, where the hydrophobic thin layer air permeability is about 100cfm or more small.

61. Section 60 of the system, where the hydrophobic thin layer air permeability is about 80cfm or more small.

62. Section 1 of the system, wherein the permeable dewatering fabric an average pore diameter is about 140 microns or smaller.

63. Section 62 of the system, wherein the permeable dewatering fabric for an average pore diameter of about 100 microns or smaller.

64. Section 62 of the system, wherein the permeable dewatering fabric for an average pore diameter of about 60 microns or smaller.

65. Section 1 of the system, wherein the permeable dewatering fabric includes anti-re-wet film, which comprises the laminated is connected to the perforated hydrophobic thin film tissue cloth woven multifilament.

66. Section 65 of the system, wherein the permeable dewatering fabric air permeability is about 35cfm or more small.

67. Section 65 of the system, wherein the permeable dewatering fabric air permeability is about 25cfm or more small.

68. Section 65 of the system, wherein an average pore size of the permeable dewatering fabric is about 15 microns.

69. Section 1 of the system, wherein the permeable dewatering fabric includes the vertical flow channel.

70. Section 69 of the system, wherein the vertical flow channel through the polymeric material is printed on the bottom of the is formed.

71. Section 69 of the system, wherein the vertical flow passage forming woven pattern, its the use of low-melting yarn, said yarn heat-forming in order to produce the channel and air resistance.

72. Section 69 of the system, wherein the vertical flow channel is formed by needling, needling from this enhanced surface characteristics and improves the wear resistance.

73. System for drying a paper web, comprising:

Carrying the permeability of the paper web over the structured fabric roll;

The contact paper and is guided across the permeability of vacuum dewatering fabrics; and

The vacuum roller for the permeable structured fabric, the web and the permeable dewatering fabric device for exerting pressure.

74. Section 73 of the system, wherein the device comprises produces an over-voltage of the drying cylinder cover.

75. Section 73 of the system, wherein the device comprises a belt-type press, its being adapted to increase the rate and will not lead to deterioration in quality of the paper web.

76. Section 73 of the system, wherein the belt press comprises a permeable belt.

77. The use of paragraph 73 of the method of drying of a web system, the method comprises:

The permeable structured fabric across the roll of the paper web;

Guide permeable dewatering fabric contacting the web roll;

The permeability in the vacuum roller structured fabric, the web and the permeable dewatering fabric mechanical pressure is applied; and

During the use of vacuum applied to the permeable structured fabric, the web and the permeable dewatering fabric to water absorption.

78. The belt press for a paper machine, the belt press comprises:

surface roller comprises;

Including with the permeability of the surface of the 1st, the of said roller is guided across a portion of the outer surface;

The permeability is at least about the tension of the strip 30KN/m;

The 1st surface of the opening of at least about 25% and a contact area of at least about 10%, preferably at least about 25%,

Wherein the paper web and the permeable belt runs between the outer surface of the rollers.

79. Section 78 of the belt press, wherein the 1st face is external surface, and wherein the with states the permeability pressure is applied to the rollers.

80. Section 78 of the belt press, wherein the through hole includes states the permeability.

81. Section 78 of the belt press, wherein the rules with states the permeability in a generally symmetrical pattern is arranged.

82. Section 78 of the belt press, wherein the states the permeabilityseveral row of through holes with includes a generally parallel to the, several rows of the through holes along the machine-direction orientation.

83. Section 78 of the belt press, wherein the applied to the rollers with states the permeability about 30KPa to about 150KPa pressure.

84. Section 78 of the belt press, wherein the states the permeability with comprises a through hole and a plurality of grooves, each groove with different through hole group cross.

85. Section 84 of the belt press, wherein the 1st face is external surface, and wherein the with states the permeability pressure is applied to the rollers.

86. Section 84 of the belt press, wherein the plurality of grooves are arranged in the 1st surface.

87. Section 84 of the belt press, wherein the plurality of grooves each have a width, and wherein the each of the through hole having a diameter, and wherein said diameter is greater than said width.

88. Section 78 of the belt press, wherein the belt of the tension is greater than about 50KN/m.

89. Section 88 of the belt press, wherein the belt of the tension is greater than about 60KN/m.

90. Section 88 of the belt press, wherein the belt of the tension is greater than about 80KN/m.

91. Section 78 of the belt press, wherein the roller comprises a vacuum roller.

92. Section 78 of the belt press, wherein the roller includes a internal circumferential part of the vacuum roller.

93. Section 92 of the belt press, wherein the states the suction roll includes at least one is arranged on the internal circumferential part of the vacuum within.

94. Section 78 of the belt press, wherein the roller includes a vacuum stick to the roller.

95. Section 94 of the belt press, wherein the suction region the circumferential length is about 200 mm to about 2,500 mm.

96. Section 95 of the belt press, wherein the circular peripheral length is about 800 mm to about 1,800 mm.

97. Section 96 of the belt press, wherein the circular peripheral length is about 1,200 mm to about 1,600 mm.

98. Fiber material drying device, comprising:

The endless guided crossed the roller permeable extended nip press (ENP) belt;

The ENP belt by the tension of at least about 30KN/m; and

The ENP belt comprises at least about 25% of the opening regions and at least about 10%, preferably at least about 25% of the side of the contact zone,

The paper web in the ENP belt and between the rollers run.

99. Permeable extended nip press (ENP) belt, it can bear at least about 30KN/m tension, the permeable ENP belt comprises at least about 25% of the opening regions and at least about 10%, preferably at least about 25% of the side of the contact zone.

100. Section 99 of the ENP belt, wherein the opening defined by the through hole and the contact area is formed by the plane defines.

101. Section 99 of the ENP belt, wherein the opening defined by the through hole and the contact area is formed by the no opening, defining the plane of the recess or groove.

102. Section 99 of the ENP belt, wherein the opening defined by the through hole and the groove, there is no contact area is formed by the opening, defining the plane of the recess or groove.

103. Section 99 of the ENP belt, wherein said opening is about 15% to about 50%, the contact area is about 50% to about 85%.

104. Section 99 of the ENP belt, wherein the spiral is ENP states the permeability sewing fabric.

105. Section 99 of the ENP belt, wherein the states the permeability ENP belt comprises at least one spiral seamed fabric.

106. Section 105 of the ENP belt, wherein at least one of the spiral suture opening of the fabric is about 30% to about 85%, and at least one spiral suture the contact zone of the fabric is about 15% to about 70%.

107. Section 106 of the ENP belt, wherein said opening is about 45% to about 85%, the contact area is about 15% to about 55%.

108. Section 107 of the ENP belt, wherein said opening is about 50% to about 65%, the contact area is about 35% to about 50%.

109. Section 99 of the ENP belt, wherein the belt comprises states the permeability arranged in the through hole of the generally symmetrical pattern.

110. Section 99 of the ENP belt, usually with states the permeability therein relative to the machine parallel to the direction in which the plurality of rows of through holes.

111. Section 99 of the ENP belt, wherein the states the permeability ENP belt comprises an endless circulating belt.

112. Section 99 of the ENP belt, wherein the belt comprises states the permeability through hole, and wherein the ENP states the permeability with the at least one side includes a plurality of grooves, the plurality of grooves with each groove of the different through hole group cross.

113. Section 112 of the ENP belt, wherein the plurality of grooves each have a width, and wherein the each of the through hole having a diameter, and wherein said diameter is greater than said width.

114. Section 113 of the ENP belt, wherein the plurality of grooves each extend into the permeable ENP belt, the quantity is less than the thickness of the permeable belt.

115. Section 99 of the ENP belt, wherein said tension is greater than about 50KN/m.

116. Section 99 of the ENP belt, wherein the states the permeability ENP belt comprises a flexible spiral seamed fabric.

117. Section 99 of the ENP belt, wherein the states the permeability ENP belt comprises at least one spiral seamed fabric.

118. Section 117 of the ENP belt, wherein the at least one spiral seamed fabric comprises synthetic material.

119. Section 117 of the ENP belt, wherein the at least one spiral seamed fabric comprises stainless steel.

120. Section 99 of the ENP belt, wherein the states the permeability ENP belt comprises at least one spiral suture with reinforced the permeability of the fabric.

121. The pressing device in the method of drying of a web, the method comprises:

The supporting surface and movable between pressure generating element is arranged in at least one of the at least one fabric and 1st 2nd of the paper web of fabric, and

The fluid to flow through said web, said at least one fabric and 1st and 2nd the support surface of the fabric.

122. The belt press for a paper machine, wherein the belt press comprises:

Includes the outer surface and at least one stick to the roller;

crossed the roller 1st surface including the outer surface of the guide a portion of the permeable belt;

The permeable belt tension of at least about 30KN/m;

1st surface of the opening of at least about 25%, a contact area of at least about 10%, preferably at least about 25%,

Wherein the paper web and the permeable belt runs between the outer surface of the rollers.

123. Section 122 of the belt press, wherein the at least one length of the circumference of the stick is about 200 mm to about 2,500 mm.

124. Section 123 of the belt press, wherein the circular peripheral length to contracting 80 degrees to about 180 degrees of arc.

125. Section 124 of the belt press, wherein the circular peripheral length to contracting 80 degrees to about 130 degrees of arc.

126. Section 125 of the belt press, wherein the at least one stick being suitable for applying the vacuum reaches equal to or greater than about 40ms of the residence time.

127. Section 126 of the belt press, wherein the residence time is equal to or greater than about 50ms.

128. Section 122 of the belt press, wherein the states the permeability with the vacuum exerts pressen ridamycin equal to or greater than about 40ms of dwell time of 1st.

129. Section 128 of the belt press, wherein the at least one stick being suitable for applying the vacuum reaches equal to or greater than about 40ms of dwell time of 2nd.

130. Section 129 of the belt press, wherein the 2nd dwell time is equal to or greater than about 50 ms.

131. Section 130 of the belt press, wherein the 1st dwell time is equal to or greater than about 50 ms.

132. Section 122 of the belt press, wherein the states the permeability belt comprises at least one spiral seamed fabric.

133. Section 122 of the belt press, wherein the at least one spiral seamed fabric comprises synthetic material.

134. Section 122 of the belt press, wherein the at least one spiral seamed fabric comprises stainless steel.

135. Section 132 of the belt press, wherein the at least one spiral seamed fabric tension of about 30 to about 80KN/m.

136. Section 135 of the belt-type press, wherein the tension is about 35KN/m to about 50 KN/m.

137. Is used for pressing and method for drying of a web, the method comprises:

The use of pressure generating element pressen in at least one of the at least one fabric and 1st 2nd of the paper web of fabric, and

At the same time the fluid to flow through said web and said at least one of the 1st and 2nd fabric.

138. Section 137 of the method, wherein said press continuing equal to or greater than about 40ms of the residence time.

139. Section 138 of the method, wherein the residence time is equal to or greater than about 50ms.

140. Section 137 of the method, wherein the light of the flow continuing equal to or greater than about 40ms of the residence time.

141. Section 140 of the method, wherein the residence time is equal to or greater than about 50ms.

142. Section 137 of the method, wherein the pressure generating element includes applying vacuum.

143. Section 142 of the method, wherein the vacuum is greater than about 0.5 bar.

144. Section 143 of the method, wherein the vacuum is greater than about 1 bar.

145. Section 144 of the method, wherein the vacuum is greater than about 1.5 bar.

Description of drawings

Reference to the following embodiments of the present invention and in conjuction with a detailed description, the invention of the above-mentioned and other features and advantages and realizing the more obvious and will be easier to understand. In the attached drawing:

Figure 1, 2, and 2a 3-8 shown advanced dewatering system of the present invention various embodiments of the cross-section of a schematic diagram;

Figure 9 is a schematic diagram of cross-section according to the present invention the embodiment of the belt press, advanced dewatering system;

Figure 10 is a top view of Figure 9 with the permeability of the belt press of one side (surface   view);

Figure 11 is the view of Figure 10 the opposite side of the permeable belt;

Figure 12 is cross-sectional view of Figure 10 and 11 with the permeability of the;

Figure 13 is of enlarged cross-sectional view Figure 10-12 with the permeability of the;

Figure 13a is of enlarged cross-sectional view Figure 10-12 with the permeability of the, and show optional triangular groove;

Figure 13b is of enlarged cross-sectional view Figure 10-12 with the permeability of the, and show an optional semi-circular groove;

Figure 13c is of enlarged cross-sectional view Figure 10-12 with the permeability of the, show an optional trapezoidal groove;

Figure 14 is cross-sectional view of Figure 11 owing to the permeability of the hatching B-B;

Figure 15 is a transverse cross-sectional view of Figure 11 owing to the permeability of the hatching A-A;

Figure 16 is cross-sectional view of Figure 11 with the permeability of the other along the hatching B-B one embodiment;

Figure 17 is cross-sectional view of Figure 11 with the permeability of the other along the hatching A-A one embodiment;

Figure 18 is a top view of the invention with the permeability of the another embodiment;

Figure 19 is a side view of Figure 18 a portion of the permeable belt;

Figure 20 is a schematic diagram of cross section of belt press according to the present invention of the mode of execution of the other of the high levels of dewatering system;

Figure 21 is partial enlarged view of the advanced dewatering system of the present invention can be used in a dewatering fabrics;

Figure 22 is partial enlarged view of the advanced dewatering system of the present invention can be used in another kind of dewatering fabrics;

Figure 23 is a schematic diagram of the cross-section of an advanced dewatering system of the present invention the press portion of the one embodiment;

Figure 24 is a schematic diagram of the cross-section of an advanced dewatering system of the present invention the press part of the another embodiment;

Figure 25 is a schematic diagram of cross section of belt press according to the present invention of another embodiment of a high level of dewatering system;

Figure 26 is a side view of part of the present invention can be used in advanced dewatering system with the permeability of the optional;

Figure 27 is a side view of part of the present invention can be used in the other of the advanced dewatering system permeability of an optional with;

Figure 28 is a schematic diagram of cross-section according to the invention of the press block of the embodiment of the belt press, a further advanced dewatering system;

Figure 29 is a schematic diagram of cross section of the present invention according to the use of the press roll belt press, a further embodiment of the advanced dewatering system;

Figure 30a can be used in the present invention is shown in the area of the metal strip Ashworth. Black said contact part of the metal strip of the representative, the representative white said non-contact zone of a metal part;

Figure 30b can be used in the present invention is shown in the area of the metal strip Cambridge. Black said contact part of the metal strip of the representative, the representative white said non-contact zone of a metal part;

Figure 30c can be used in the present invention that in the area of the Voith fabric fabric. Black said contact with part of the representative, the representative white said non-contact zone of the belt portion.

In these Figure, the Figure corresponding to the corresponding part of the mark. Provided herein are exemplary embodiments of an example one or more of the invention can accept or preferred embodiment, these example and not to in any way limit the scope of, the invention.

Mode of execution

The details of the shown herein in the form of the embodiment, in order to illustratively discuss embodiments of the present invention, and to provide that is the most useful and easy to understand the principle of this invention and the description of the design is provided. On this point, in order to only basic understanding of the invention and show the details of the structure of the present invention, the specification and drawings the technical personnel in this field know how in practice the form of embodying the invention.

Now refer to Figure 1, Figure 1 shows the use of belt-type press 18 of the main pressure field in the form of a high dewatering system (ADS). Structured fabric 4 the formed paper web W to the vacuum box 5, with the vacuum tank at about -0.2 to about -0.8 of the nominal operation under vacuum pakistani 20gsm paper web was about 15% to about 25% solid content, preferably from about -0.4 to about -0.6 the operation of the level. At about -0.2 to about -0.8 operation of the vacuum level of the vacuum roller 9, preferably from about -0.4 bar or operating under higher level. Belt-type press 18 includes a single fabric with 32, around the suction roll can 9 conveying paper web W of the structured fabric 4 of the non-sheet contact side of the applied pressure. Fabric 32 is a continuous or endless belt, which is guided by bypassing a plurality of guiding and roller permeability. Optionally, a hot air drying cylinder cover 11 arranged on the belt 32 in, and is arranged in the vacuum roller 9 above, thus improving the dewatering effect. A honeycombed 9 comprises at least one vacuum zone Z and its circumferential length is about 200 mm to about 2500 mm, preferably about 800 mm to about 1800 mm, more preferably about 1200 mm to about 1600 mm. The thickness of the shell roll is preferably about 25 mm to about 75 mm. Z stick to the flow of the paper web in the area 112 of the average air flow rate can be about 150m³/min machine width per metre. Leave the suction roll 9 solid level is about 25% to about 55%, depending on installation selection, preferably greater than about 30%, more preferably greater than about 35%, more preferably greater than about 40%. Optionally the lead vacuum box (  box   vacuum pick   up) 12 can be used to ensure that the sheet or paper web W follows the structured fabric 4 and the dewatering fabric 7 separation. It should be noted that, in the 1st pressure field, and the air flow (i.e., vacuum box 5) and a main compressing force field (i.e., the vacuum roller 9 formed) are opposed to each other in the direction of the. The system also utilizes one or more spraying unit 8 and one or a plurality of vacuum suction box 6.

The use of belt-type press 18, obviously increased degree of dryness. With 32 should be able to support recovering of the strip up to about 80KN/m, but will not be damaged and will not damage the quality of the paper web. For every increase of tension 20 KN/m, aridity of the paper web W increase of approximately 2%. May not be obtained with less than about 45KN/m frustrates rubs the strength requirements (file   force), when the operation of the machine, with can greatly stretching. To this end, belt 32 can be, for example, pin sealing strip, spiral seaming fabric, may even stainless steel metal strip.

Permeable belt 32 can be a spiral coil horizontal gauze usually through the use of the woven yarn and the yarn, thus form the sewing fabric. The stated non-limiting examples include metal strip Ashworth, Cambridge Voith fabric fabric and metal strip, as shown in Figure 30a-c illustrated. The described herein the spiral seaming fabric can also be composed of polymer material, and/or is preferably applied about 30KN/m to 80 KN/m tension, preferably about 35KN/m to about 50KN/m tension. This improves the high-tension cannot bear performability of the tape, and the dehydrated balanced full of the paper web. Figure 30a can be used in the present invention is shown in the area of the metal strip Ashworth. Black said contact part of the metal strip of the representative, the representative white said non-contact zone of a metal part. Ashworth belt is metal chain belt, the tension thereof about 60KN/m. Opening can be about 75% to about 85%. The contact zone can be about 15% to about 25%. Figure 30b can be used in the present invention is shown in the area of the metal strip Cambridge. Similarly, the representative black said contact part of the metal strip, said metal strip on behalf of white non-contact zone of the part. Cambridge belt is metal chain belt, the tension thereof about 50KN/m. Opening regions may be about 68% to about 76%. The contact zone can be about 24% to about 32%. Finally, Figure 30c shows the area of the Voith fabric fabric, it is in this invention the most preferred. Black said contact with part of the representative of the fabric, with the fabric of white said part represents non-contact zone. Voith fabric belt can be polymer stitching the fabric, the tension thereof about 40KN/m. Opening can be about 51% to about 62%. The contact zone can be about 38% to about 49%.

Dewatering fabrics 7 of the structure can be very thin, of the order of magnitude of this is to reduce the amount of the water is carried, thereby improving dehydration efficiency and reduce/preclude the use of the structure of the prior art the observed re-wet phenomenon. However, the press anti-re-wet film has not been realized in the belt press any increase of dryness. Relatively soft thicker and the more is the band structure of the benefit from the belt press. Needlescopic flocculent structure with the blanket may be 7 better selection. Through heating and dewatering fabrics 7 up to about 50 the [...] , can realize high up to about 1.5% or more high degree of dryness. For greater than about 50ms all the dwell time, the dwell time is not affected to dryness, roller 9 in the higher the vacuum level, the paper web W of the higher degree of dryness.

Regarding used for paper web W of the fiber suspension, with respect to the use of high concentration of mill low thick , the degree of dryness. Low SR degrees, low fineness, more high porosity leads to better dewatering performance. The use of appropriate equipment is also favourable. The high consistency refining (approximately 30% concentration) and low thick jordaning (about 4.5% concentration) comparison test between, in addition to more grinding paste small external, inventor tissue towel paper can be obtained the same tensile strength required. The 100% for softwoods jordaning to 17SR rather than 21SR, tensile strength of the same, in other words, lead to Schopper   Riegler than about 4 degrees. Through the same jordaning degrees (in other words, 17SR) the ratio of concentrated jordaning and low thick jordaning, the inventor uses high consistency refining can realize higher than about 30% of the tensile strength. Using the thickener such as net-type press or screw press, and then filled with fine grinding of the disc type dispersion machine, high consistency refining can be realized. For the thin tissue paper is possible, because the required tensile strength is low. In order to achieve target tension-resisting of the paper towel, the inventor uses passes through the disc type dispersion machine (pass) of the two channels. Another advantage of the above-mentioned method is to reduce refining, resulting in fewer ADS of the concept of small fiber, WRV (guarantees the water number) is low, the porosity is high and good dehydration performance. The dehydration performance through better, the machine speed can be increased, but also lower refining paper quality level.

The embodiment of the main pressure field comprises a suction roll or suction box. Non-limiting example of such equipment are described in this text. Through the main pressure field of a sheet or paper web in the average air flow rate is preferably about 6 m/s.

Are described dewatering fabrics 7 or in the non-limiting example. A preferred structure is the traditional needled press fabric, having a multi-layer rod-shaped fiber, wherein the rod-shaped fiber is about 0.5 minute especially to approximately 22 dtex. With 7 can include a combination of different dtex fibers. Also preferably contains a binder in order to strengthen the fiber-fiber bonding, for example, low-melting-point fibers or particles, and/or a resin treatment agent. With 7 may be a thin structure, its thickness is preferably less than approximately 1.50 mm, or more preferably less than approximately 1.25 mm, most preferably less than about 1.0 mm. With 7 can include weft yarns, the twisting can be a conventional multifilament yarn of or plied. The diameter of the weft yarn can also be is typically less than about 0.30 mm solid single yarn, preferably less than about 0.20 mm, or as low as about 0.10 mm. The weft yarn can be single strand, or cable preventing twisted yarn from crinkle, or parallel with, or flat shape. With 7 can also use is monofilament warp, its diameter is about 0.30 mm to about 0.10 mm. They can be twisted or single thread, its diameter is preferably about 0.20 mm. With 7 can be needled is provided with a straight-way drain channel, can it is preferred to use a generally uniform needling. With 7 can also include the optional on one surface of a hydrophobic thin layer, its air permeability is about 5-110cfm, preferably about 19cfm or more, the most preferably about 35cfm or more. An average pore diameter can be about 5 to about 75 microns, preferably about 25 microns or more, more preferably about 35 microns or more. With 7 can be performed by a variety of synthetic polymer material or even wool made, preferably from a polyamide such as nylon 6 is made.

With 7 alternative structure can be laminated on a woven base cloth against again wet level. The base fabric is endless woven structure, this structure uses about 0.10 mm to about 0.30 mm, preferably from about 0.20 mm diameter monofilament warp (paper machine and cross machine direction yarns) and usually twisted/plied the combination of the multifilament yarns. The diameter of the yarn can also be is generally less than about 0.30 mm solid single yarn, preferably diameters of less than about 0.20 mm, or as low as about 0.10 mm. The weft yarn can be single strand, or cable preventing twisted yarn from crinkle, parallel bound or flat weft yarn (on a paper machine in the machine direction of the yarn). The base fabric can be laminated on the against again wet level , it is preferably elastic body casting permeability thin film. Permeability the thickness of the film can be about 1.05 mm, preferably less than approximately 1.05 mm. The elastic body is cast film through the purpose of providing an air buffer layer in order to delay water back to the paper so as to prevent paper in re-wet, because water is able to reach the air requirements between the movement of the sheet. Laminating method can be through the elastic body in membrane fusion in the woven base cloth on the front side of or through the needling two or less rod-shaped fiber sheet (and two or less rod-shaped fiber sheet positioned at a back side in order to connect two layers) and realize. Optionally a hydrophobic thin layer can be applied on the surface. The optional level air permeability is about 130cfm or less, preferably about 100cfm or less, the most preferably about 80cfm or more low. With 7 the average pore diameter can be about 140 microns or less, more preferably about 100 microns or less, most preferably about 60 microns or less.

With 7 another alternative structure of the use of anti-re-wet film, which comprises a laminated in the perforated hydrophobic thin film tissue cloth woven multifilament, the air permeability of said membrane 35cfm or more small, preferably 25cfm or more small, the average pore diameter of 15 microns.

With vertical flow channel is preferably used. Through these channels can be printed on the fabric and polymer material. They can also be through the use of low-melting-point of the yarn produced by special woven pattern, said yarn subsequently hot forming in order to produce channel and air, in order to prevent leakage. These structures can be needle punched, in order to offer the surface enhancement and abrasion resistance.

When used in the belt 7 the fabric have been combined together, these fabrics can be on the machine through the knocking (sock) stitched/combining. Sealing/bonding method on the machine does not hinder dehydration method.

In this application of the fabric 7 of the surface can be modified in order to change the surface energy. They can also be provided with the in-plane flow performance is hampered, only Z direction so as to promote the flow.

Figure 1 also can have the following configuration. Belt-type press 18 is installed in the vacuum roller 9 above. Permeability fabric 32 with can to carry paper web W around the suction roll 9 of the structured fabric 4 exert pressure of the non-sheet contact surface. Single fabric 32 is characterized in that the permeable. Optionally, a hot air drying cylinder cover 11 is mounted in the belt press 18 proximate the interior of the 9 to improve the dewatering effect. Belt-type press 18 permeability used in the fabric 32 is the special design of the extended nip press (ENP) belt, for example, flexible reinforcing polyurethane belt , providing about 30 to about 150KPa, preferably greater than about 100KPa low pressen level. This means that, for example, the diameter is about 1.2 metres of suction roll 9, with 32 can be greater than the tension of the fabric of about 30KN/m, preferably greater than about 50N/m. Pressen length can be less than, equal to or greater than the roller 9 Z of the length of the circumference of the stick. ENP belt 32 may have a groove or single plane surface. Fabric 32 may have a drilling pattern, by the sheet W at the same time by means of the press and the vacuum effect of the air flow. The combined increase sheet of high solid content up to about 15%. The special design of the ENP belt is only one example of a particular fabric, the fabric can be used in the method and is definitely not only a kind of structure type can be used. For use in belt-type press 18 permeability fabric 32 is one of the basic features of the operation of the abnormal high tension (an example such as about 50KN/m or higher) operating under the surface of the fabric has a relatively large contact area (an example such as about 10% or 25% or more) and a large opening regions (an example such as about 25% or more).

With 32 examples of another option is a spiral suture thin fabric. The spiral seaming fabric can be independently used as the fabric 32 or, for example, it can be disposed in the ENP belt. As described below, the fabric 32 crosses the pressure is applied to the structured fabric 4. By carrying the paper web W of the structured fabric 4 transmit the pressure. Paper web W high quantitative of the pillow type region is located on a structured fabric 4 internal, therefore, to be protected from this pressure to act. Therefore, the press method not to adversely affect the quality of the paper web, but increases the dehydration rate of the suction roll. Figure 1 shown in use in belt-type press with 32 can also be used in combination with map 9-28 in the type of belt-type press.

The invention also provides suction roll 9 can be arranged between the former and Yankauer dryer. Sheet or paper web W is carried around the suction roll 9. The parting of the special designed dewatering fabric 7 a separate operation of the fabric 32. It also can have the dewatering fabric 7 of the fabric run below the 2nd, in order to further disperse the air. Paper web W contact dewatering fabrics 7, in order to promote and to fully dehydrate hot Yuncker type dryer/drying cylinder cover heat transfer, thus further drying and subsequent creping. Figure 2 shows a number of additional selection, in order to improve this method. However, this is not a list is exhausted, for example purposes only. One aspect of the invention provides a structured fabric 4 (it may be an impression fabric or TAD fabric) is formed on the web page of light weight, thin, and to provide a solid content of a web W, the solid content is sufficient to affect Yankauer of a cylinder to transmit in order to carry on subsequent drying, creping and winding.

Again refer to fig. 2, the use of vacuum box 5 is about -0.2-0.8 pakistan to approximately pakistani vacuum level of the nominal running under 20gsm the paper web W is about 15% to about 25% solid content, preferably from about -0.4-0.6 pakistan to approximately pakistani of operation. At about -0.2-0.8 pakistan to approximately operation of the vacuum level of the vacuum roller 9, preferably from about -0.4 bar or under higher vacuum level of operation. Optionally, a hot air drying cylinder cover 11 mounted on the vacuum roller 9 above, in order to improve the dehydration in it. A honeycombed 9 Z of internal vacuum zone of the circumferential length may be about 200 mm to about 2500 mm, preferably about 800 mm to about 1800 mm, more preferably about 1200 mm to about 1600 mm. By means of non-restrictive example, a honeycombed the thickness of the outer shell is preferably about 25 mm to about 75 mm. The paper web through the stick to the Z region 112 of the average in-flow can be about 150m³/min machine width per metre. Leave the suction roll 9 of the solid can be about 25% to about 55%, depending on installation selection, preferably greater than about 30%, more preferably greater than about 35%, most preferably more than about 40%.

Optionally a vacuum box 12 can be used to ensure that the vacuum roller 9 the rear sheet or paper web W follows the structured fabric 4. With hot air supply drying cylinder cover 13 optional and can also be used for vacuum in the vacuum roller 9 and after Yankauer dryer 16 solid content before the sheet is increased. Steering roller can also be using mesh 14. In Figure 2a can be seen, the roller 14 can be with hot air supply drying cylinder cover 11 the steering roller [...] of the water. By means of non-restrictive example, standard pressure roller 15 can also be a shoe press, the width of the block (shoe) is about 80 mm or greater, preferably about 120 mm or more, the maximum peak pressure can be used is preferably less than about 2.5 MPa. In order to form even more long extended nip, in order to promote the band 4 to the Yuncker type dryer 16 transfer of the paper web, with structured fabric 4 of the paper web W in contacting the roller 15 and Yankauer dryer 16 is formed before the nip, contacts the Yuncker type drying cylinder 16 surface. Or, the roller 15 and Yankauer dryer 16 after forming the nip, structured fabric 4 can contacts the Yuncker type dryer 16 up to a certain distance from the surface of the. According to another alternative viable options, can use the two or the combination of these features.

From Figure 2 can be seen, the device uses the headbox 1, forming roller 2 (which may be a solid or water absorption of forming roller), forming fabric 3 (can be the same with SP), a plurality of vacuum suction box 6, the 6 [...] , a plurality of sprayer 8, the 8 [...] , and a plurality of white water recovery device 10, the 10 [...] and 10 the [...] , and drying cylinder cover 17.

Figure 3 also shown advanced dewatering system of one embodiment. This mode of execution is usually connected with the Figure 2 embodiment is the same as shown, in addition to increasing is arranged in the suction roll 9 instead of the hot drying cylinder cover the top of the belt press 18. Belt-type press 18 includes a single fabric belt 32. Fabric 32 is permeable belt, it can to carry paper web W around the suction roll 9 of the structured fabric 4 exert pressure of the non-sheet contact surface. Permeability fabric 32 can be of any type described in this invention, used for forming suction box of the suction roll or belt press for example, with 32, such as the reference chart 1 and 4-8 description.

Figure 4 shows a high dewatering system of the embodiment. The system and the Figure 2 and 3 is similar to the system, its use chart 3 is shown in the belt press 18 and combined with Figure 2 the type of drying cylinder cover 11. Drying cylinder cover 11 is a hot air supply drying cylinder cover, placed on the permeable fabric 4 is. Fabric 4 can be, for example, the application type of the ENP belt or spiral seamed fabric. As the foregoing many embodiments, with 4 carrying the paper web W of the structured fabric 4 at the top. As described earlier, in the situation of the embodiment of the, paper web W is arranged in the structured with 4 and dewatering bands 7 between, so that the paper web B when the dewatering fabrics 7 wrapped suction roll 9 contact the dewatering fabric 7. Through this way, the promotion of paper web W dehydration.

Figure 5 shown advanced dewatering system of another embodiment. The embodiment and the Figure 3 similar to that shown, the difference is, in the suction roll 9 and Yankauer dryer 16 (rather than suction box and drying cylinder cover 13) is arranged between the (boost   dryer) promotion of dryer used for BD in the paper web W transfer to the Yuncker type dryer 16 and roller 15 and 16 of the paper web before squeezing spot between additional drying. Promote the value of BD in the dryer for the system/method to provide additional drying, so that the production capacity increase. Paper web W is sent into the promotion of dryer in BD, at the same time located in structuring fabric 4 is. Then sheet or paper web W contacts to facilitate the dryer roller 19 of the hot surface, and around the heated roll is transported, to leave the dryer when the drying degree of the promotion is obviously higher than the degree of dryness of the dryer when the BD. The woven fabric 22 in the around the promotion of dryer roller 19 of the structured fabric 4 at the top. The fabric 22 is the special design of the top of the metal fabric (metal fabric) 21, its contact woven fabric 22 and the cooling jacket 20, cooling jacket for all fabric 4, 21, 22 and paper web W applied pressure. Similarly, paper web W high quantitative of the pillow type region is located on a structured fabric 4 to be protected from the effects of this pressure. Therefore, the press set/method not to adversely affect the quality of the paper web, and the promotion of dryer is to increase the rate of drying of the BD. The promotion of dryer BD provide sufficient pressure to the paper web W is kept at impulse 19 on the hot surfaces so as to prevent foaming. The structured fabric 4 gateway of the formed vapor through the woven fabric 22, the metal fabric 21 is condensed. Metal fabric 21 made from a high heat conductivity is made of heat conducting material, and contact the cooling jacket 20. This will its temperature is reduced to greatly lower than the steam temperature. The condensed water may be woven fabric 22 capture, then left in the woven fabric for drier rolls 19 and again entering the use before dewatering device 23 dehydration.

The invention is also envisaged, according to the dryer the size of the BD, not to need to suction roll 9. Similarly depend on the size of the BD promote dryer another choice is in fact in the promotion of dryer roller 19 is formed on the surface of the fold, thereby not requiring Yankauer dryer 16.

Figure 6 is an advanced dewatering system of another embodiment. The system and Figure 3 similar to that shown in, in addition to the suction roll 9 and Yankauer dryer 16 is arranged between the pneumatic press 24. By means of non-restrictive example, pneumatic press 24 is by means of a high-temperature air using the four roller press (  press   roll four   cluster), in other words, it can be HPTAD. Pneumatic press 24 is used for the paper web W transfer to the Yuncker type dryer 16 and roller 15 and 16 of the paper web before squeezing spot between additional drying. Or, can use the US 6,454,904 and/or US   6,096,169 described in the space U is set, all of its contents into this text by reference. These apparatus are used for mechanical dewatering, thereby replacing a ventilation dryer (TAD). As shown in Figure 6, system 24 or four roll press comprises a main roller 25, ventilates the roller 26 and two ge Gun (cap roll) 27. The purpose of the compressor is to provide the sealed chamber being pressurized. When the correct seal, can be in each roller is connected with the contacts from minor pressen role. The press is applied to the fabric 4 is higher than that of the joint point. In this way, the fabric 4 and remained protected pillow area of paper quality can be maintained. The pressure chamber includes a high-temperature air, for example, about 150 the high [...] or more, which is higher than the conventional ventilation under the pressure of the drying (TAD) technology. Pressure may be, for example, greater than about 1.5PSI, in conventional TAD higher the rate of drying. As a result, the dwell time is required, and the HPTAD   24 can be adjusted to significantly less than the size of the conventional TAD drum, thus being easy to be installed on the system. In operation, high-pressure hot air through an optional air dispersing fabric 28, through the structured fabric 4 of the sheet W, and then enters into ventilates the roller 26. It may be necessary to optionally of the fabric air dispersion, 28, in order to prevent the sheet W with one of the four roller press ge Gun 27. Fabric 28 must be very open (i.e., it can have a specific structured fabric 4 higher or and its equal high permeability). HPTAD   24 depends on the rate of drying of the solid content of the paper, but is preferably greater than or equal to about 500 kg/hr/m², this means that conventional TAD is at least two times the speed of the machine.

The HPTAD system/method is to improve the dewatering sheets of paper without significant loss of quality, and reduce system volume of the energy efficiency is improved. The system also provides higher Yankauer the solid content of the paper web W, this increases the system/method of the present invention the speed potential. As a result, the present invention to increase the production capacity of a paper machine. Its compact HPTAD for example mean that volume is easy to be retrofit into the existing machine, so that the increase rate of the machine the choice of the capability to become cost-effective. The pair of paper web will have a negative effect on quality. The compactness of the HPTAD and volume of the fact that the sealing system is also means easy installation and optimize the efficiency of the operation of the unit to increase capacity.

Figure 7 shows the advanced dewatering system of one embodiment. The system and Figure 6 is similar to shown, provide HPTAD   24 of the two channel portion (pass   option). W is structured fabric sheet 4 is transported through four roller press 24. The two ventilates the roller 26 is used for making the its dwell time is doubled. Can use optional fabric air dispersion of 28. In operation, air flows through hot pressing is structured fabric 4 carrying the sheet W, then enter the two ventilates the roller 26. It may be necessary to optionally of the fabric air dispersion, 28, in order to prevent the sheet W with one of the four roller press ge Gun 27. On this point, the fabric 28 needs are high open (i.e., with greater than or equal to that of the impregnated fabric 4 of the high permeability).

According to H   PTAD   24 configuration and size, for example, which can be provided with more than one of the tandem arrangement of the HPTAD   24, can be no longer need to suction roll 9. Figure 7 of the HPTAD shown in double path   24 with the advantages of the combined Figure 6 the single-channel system 24 the same, in addition to substantially greater than the dwell time.

Figure 8 shown advanced dewatering system of another embodiment. In this embodiment, the double-network forming device to replace OZP 2-7 shown in the crescent forming device. Forming roller 2 can be a solid roller or open. If using open roller , care must be taken, in order to prevent via the structured fabric 4 dehydration notably, in order to avoid loss of fiber density pillow area (quantitative). External (outer   wire) or forming fabric 3 can be standard forming fabric or with a DSP (such as the United States Patent 6,237,644 disclosed in the type, the content of all incorporated herein by reference). Internal forming fabric 29 must be structured fabric, the forming fabric compared to outside 3 to be coarse. double net forming device after the, subsequent use of the vacuum apparatus 30 of the paper web W is delivered to the other structured fabric 4. Conveying device 30 may be of a fixed vacuum block or vacuum auxiliary rotating paper. Structured fabric 4 the degree of roughness of the use of at least the same, preferably than the structured fabric 29 rough. Starting from here, the system can use the above-mentioned embodiment is characterized in the design of many of the similar, including all of the present invention all possible options. On this point, the Figure mark 31 is possible, for example the apparatus 13, BD and 24, the reference chart 2-7 stated. The system/method for the quality of the generated configuration of the conventional paper TAD competitive system, however, there is no the aforesaid system/method of competitive is strong. The reasons for this are generated in a forming process of the high fiber density (pillow) (quantitative) pillow does not need to be and wet forming method (vacuum receipt device 30 and subsequent wet molding vacuum box 5) new pillow area alignment. In these pillow area will be a part of the press, thus loss of some of the advantages of the embodiments. However, the system/method selection will enable the transmission at different rates, the improvement of the performance of sheets has been described (refer to, for example, the US Patent 4,440,597).

As mentioned above, Figure 8 shown is arranged in the suction roll 9 and Yankauer drying cylinder 17 between the selected additional dehydration/drying 31. By means of non-restrictive example, device 31 can be supplied with hot air drying cylinder cover, the promotion of drier, and conventional TAD of the HPTAD suction box form.

It should be noted that, for conventional TAD a preferred embodiment of the present invention is viable option for the purposes. This kind of device provides a structured fabric 4 paper web W and is formed on the paper web W of the fabric 4 at the same time until the transmission exists to the Yuncker type dryer 16 position (depending on its size). However, its use by conventional TAD drum and air required by the size of the restrictions of the system. Therefore, described herein, can be used with the modified   Former Crescent of the existing conventional TAD machine.

Figure 9 is shown for the treatment of a fibrous web W dewatering system ADS a high level. System ADS comprises a fabric 4, suction box 5, a honeycombed 9, dewatering fabrics 7, belt-type press assembly 18, drying cylinder cover 11 (which may be a hot air drying cylinder cover), paper guide suction box 12, vacuum suction box 6, one or a plurality of spraying unit 8, and one or a plurality of white water recovery device 10. Fiber material ADS paper web W enters the system, usually from the right side to enter, as shown in Figure 9. W web of fiber paper web that are pre-molded (i.e., by the forming of the above-mentioned type of device), it is placed in the fabric 4 is. In Figure 9 can obviously descry, water-absorbing device 5 provides towards paper web W one side of the water-absorbing, at the same time suction roll 9 provide towards paper web W to an opposite side of the water-absorbing.

A fiber web W in the machine direction of the fabric on the M 4 move through the one or more guide rollers through the suction box 5. The vacuum box 5 in, removed from the paper web W in sufficient moisture, in order to reach nominal usual or the operation of the paper web 20 g per sq m (gsm) about 15% to about 25% solid content. Vacuum box 5 for vacuum level of about -0.2 to about -0.8 bar, preferably from about -0.4 to about -0.6 bar and make the operation.

When the fiber web W along the machine direction when moving M, its contact dewatering fabrics 7. Dewatering fabric 7 can be an endless belt, which is a plurality of guide rollers guiding and also is guided around the suction roll 9. Dewatering bands 7 can be of the type shown in the dewatering fabrics, as shown in Figure 21 or 22 as shown, or combined OZP 1-8 shown in the embodiments of. Then paper web W toward the fabric 4 and dewatering fabrics 7 roll between the 9 movement. Vacuum roller 9 rotating M along the machine direction, and at about -0.2 to about -0.8 is operated under a vacuum level, preferably at least about -0.4 bar and make the operation. By means of non-restrictive example, roller 9 can be the thickness of the outer shell a vacuum is about 25 mm to about 75 mm. Z is provided through the stick to the paper web W of the air flow rate. Z through the stick to the paper web W in the airflow rate can be about 150m³/min machine width per metre. Fabric 4, paper web W and dewatering fabrics 7 is guided by the roll 9 and permeable belt 32 to form a belt-type press 18. As shown in Figure 9, permeable belt 32 is simple root for no reason endless belt, which is a plurality of guide rollers guide, and is pressed against the vacuum roller 9, thereby forming a belt-type press 18.

The peripheral length of a vacuum zone Z can be about 200 mm to about 2500 mm, preferably about 800 mm to about 1800 mm, more preferably about 1200 mm to about 1600 mm. Leave the vacuum roller 18 of the paper web 12 in the solid in about 25% to about 55% change between the, vacuum pressure and the permeability depends on the tension of the belt and the length of the vacuum zone Z and paper web 12 in the vacuum zone Z of the residence time. The paper web in the vacuum zone Z 12 sufficient to cause the dwell time of the solid content is about 25% to about 55%.

See Figure 10-13, shown belt press 18 with the permeability of the 32 of the details of one embodiment. With 32 includes a plurality of through-holes 36. The through hole 36 to perforation pattern 38 is provided, Figure 10 shows a non-restrictive example. As shown in Figure 11-13, with 32 including arranged on the belt 32 on one side (i.e., with 32 or the outer side of the contact fabric 4 side) of the groove 40. Permeable belt 32 so as to be attached to fabric 4 on the upper surface of, the fabric 4 pressed to the belt press 18 of the paper web W. This, in turn, lead to paper web W is pressed to the fabric to the fabric 7, which is a honeycombed 9 list in general terms in the support. When the temporarily around the combination of the roll is attached or squeezing 9 continues M along the machine direction, vacuum zone Z encountered. Vacuum zone Z received from the drying cylinder cover 11 of the air flow, this means that the air from the drying cylinder cover 11 to flow out, through the permeable belt 32, through the fabric 4 and through the drying of the paper web W, finally through a belt 7 Z and into the vacuum. In this way, moisture from the paper web W is extracted via the fabric and 7 and a honeycombed 9 transfer of the porous surface of the water. As a result, the paper web W at the same time by squeezing and air flow. M by means of a vacuum system (not shown) is pumped into or introduce into the vacuum roller 9 most of the moisture is discharged in. However, from the roller 9 some of the surface moisture by one or more of white water recovery device 10 to collect, the white water recovery device is installed in the vacuum roller 9 below. When the paper web W away from the belt press 18 of the, fabric 7 and the paper web W separation, paper web W to continue to the fabric 4 together through the vacuum paper pick up device 12. Apparatus 12 amount field from the fabric 4 and paper web W extracting moisture to stabilize the paper web W.

Fabric 7 through one or more spraying unit 8. These unit 8 to the fabric to the fabric 7 applied moisture, thus clean the fabric 7. Fabric 7 through a vacuum suction box 6, vacuum suction box from the fabric 7 removing moisture.

Fabric 4 can be structured fabric 14, having the same reflected in the paper web W of the three-dimensional structure, to form a paper web W thicker pillow area. The belt press these pillow area 18 are protected during pressing in, because they lie on the structured fabric 4 in vivo. So, belt-type press assembly 18 of the paper web W is applied to the paper web or paper quality is not adversely affected. At the same time, the vacuum automatically 9 the dehydration rate. If with 32 used in a no press/low press device, then the pressure can be through dewatering fabrics also known as the press fabric transfer. At this moment, the web W is not influenced by structured fabric 4 protection. However, the belt 32 is still advantageous, because the nip than conventional pressen long, this leads to a lower specific pressure (specific   pressure) and to the paper web W of smaller or reduced paper compression.

Figure 10-13 shown with the permeability of the 32 with the above-mentioned combined with Figure 1 and 3-8 with 32 the same type of, and can provide a relatively low pressure level, about 30KPa to about 150KPa, preferably greater than about 100KPa. In this way, if the suction roll 9 has a diameter of 1.2 m, the band 32 can be greater than the tension of the fabric of about 30KN/m, preferably greater than about 50KN/m. The press fabric 4 with the permeability of the 32 (is a honeycombed 9 indirect support) of the press length can be at least equal to or greater than the roller 9 Z of the length of the circumference of the stick. Of course, the invention is also envisaged, permeable belt 32 of the contact portion (in other words, the rollers 9 guide or crossed the roller 9 with part of the) Z than the stick can be short.

As shown in Figure 10-13, permeable belt 32 has a through hole 36 of the pattern 38, in which can be the same, for example, by drilling, laser cutting or etching to form or knitting a in it and forming. Permeable belt 32 can also be essentially single plane, i.e., no Figure 11-13 is shown in 40. Is provided with a groove 40 of the belt 32 can be the surface of the presser along belt type 18 in with the permeability of the 32 contacts fabric the operating part 4. Each groove 40 with a group of (or a plurality of groups of) or a row of (or a plurality of rows of) hole 36 is connected, so that the air to pass through it to the belt 34 in distribution. In this way, air along the groove 40 distribution. Groove 40 and the opening 36 with a 32 a, and the contact region (that is, with 32 the surface of the fabric 4 or paper web the area of the W pressure) is adjacent. Air via the hole 36 from the containing groove 40 on the opposite side of one side of the permeable belt 32, then transfer to the recess 40 and along the groove 40 flow, and flows through the fabric 4, paper web W and fabric 7. In Figure 11 can be seen, the hole 36 is larger than the diameter of the groove 40 of the width. Although a circular hole 36 is preferred, but they do not need to be circular, with the implementation of the required function can be of any shape or configuration. Moreover, although Figure 13 shows the groove 40 has a generally rectangular cross section, but the groove 40 can have different cross-sectional configuration, Figure 13a of the triangular cross section as shown in, Figure 13c of the ladder-shaped cross section is shown, and Figure 13b is shown in semi-circular or semi-elliptical cross-section. Permeable belt 32 and a honeycombed 9 show the combination of the solid content of the paper is increased at least 15%.

By means of non-restrictive example, Figure 11 the usual parallel grooves shown in 40 the width can be about 2.5 mm, and from the outer surface (i.e., with the belt 14 contact surface) measurement of the groove 40 of the depth can be about 2.5 mm. The through hole 36 of the diameter can be about 4 mm. Measuring in the width direction of the groove 40 is about the distance can be between 5 mm. The opening 36 between the longitudinal distance (measured from the centerline) can be about 6.5 mm. The opening 36, each row of the opening or the groove 40 of the distance between (along the width direction of the measuring from the centerline) can be about 7.5 mm. Every a row of openings 36 can deviate from about one half, so that the longitudinal distance between adjacent openings can be the same row of opening 36 half of the distance between, for example, 6.5 mm half of. With 32 the whole width of the can be about 1050 mm, an endless belt 32 of the overall length may be about 8000 mm.

Figure 14-19 can be used is shown in Figure 9 the belt press of the type shown in 18 in with the permeability of the 32 of the non-restrictive embodiments. Figure 14-17 with shown in 32 can be comprised of flexible reinforced polyurethane 42 of the extended nip press belt is made. It may also be a Figure 18 and 19 of the type shown in the spiral seaming fabric 48. Figure 14-17 shown with the permeability of the 32 also provide low pressen horizontal, about 30 to about 150KPa, preferably greater than about 100KPa. This allows, for example a diameter of 1.2 metres of suction roll can offer greater than about 30 KN/m, preferably greater than about 50KN/m fabric tension. The press fabric 4 with the permeability of the 32 (is a honeycombed 9 indirect support) of the press length can be at least equal to or greater than the roller 9 Z of the stick. Of course, the present invention is so conceived that permeable belt 32 than the contact part of the Z stick can be short.

The reference Figure 14 and 15, with 32 can have a polyurethane matrix (matrix) 42 form, its permeability structure. Permeability structure can be provided with woven structure is in the form of, at least partially embedded in a polyurethane matrix 42 in the reinforced machine direction yarns 44 and the transverse yarn 46. With 32 also includes the through hole 36 and generally parallel longitudinal groove 40, the join graph 11-13 shown in several rows of the embodiment of the opening.

Figure 16 and 17 shown with 32 of another embodiment. With 32 includes the polyurethane matrix 42, having a spiral suture fabric 48 forms of permeable structure. Fabric 48 at least at least partially embedded into the polyurethane matrix 42. Hole 36 extends through the belt 32 and can be at least partially spiral cut off part sewing fabric 48. Usually parallel longitudinal groove 40 is also connected with a few rows of openings, such as the above-mentioned embodiment.

By means of non-restrictive examples and reference map 14-17 the embodiment shown in, Figure 15 the usual parallel grooves shown in 40 the width can be about 2.5 mm, and from the outer surface (i.e., with the belt 14 contact surface) measurement of the groove 40 of the depth can be about 2.5 mm. The through hole 36 of the diameter can be about 4 mm. Measuring in the width direction of the groove 40 can be a width of between about 5 mm. The opening 36 between the longitudinal distance (measured from the centerline) can be about 6.5 mm. The opening 36, several rows of the opening or the groove 40 of the distance between (along the width direction, measuring from the centerline) can be about 7.5 mm. Every a row of openings 36 can deviate from about one half, so that the longitudinal distance between adjacent openings can be the same row of opening 36 half of the distance between, for example, 6.5 mm half of. With 32 the whole width of the can be about 1050 mm, unlimited endless belt 32 of the overall length may be about 8000 mm.

Figure 18 and 19 show permeable belt 32 a of the embodiment. In this embodiment, the yarn 50 through the use of transverse yarn 52 interleaving (entwining) usually spiral of woven yarn 50 is connected, so as to form the sewing fabric 48.

Using the previous embodiment, fig. 18 and 19 shown in the with the permeability of the 32 can be at least about 30KN/m to at least about 50KN/m or higher running under high-operating tension, can have about 10% or greater surface contact area and about 15% or greater of the split. The contact zone can be about 25% or more, opening regions can be about 25% or more. Preferably, permeable belt 32 is about a 50% to 85%. Figure 18 and 19 is shown with the permeability of the 32 of the composition can include spiral suture thin structure, the permeable belt has the same 32 of the support layer. Furthermore, permeable belt 32 can be a spiral suture fabric, its contact zone is about 10% to about 40%, of the split thereof is about 60% to about 90%.

Is described below using fig. 9 shown in the advanced dewatering system of the ADS method. The ADS belt type press 182, thus the initial arrival in the web after formation of the belt press 18 before the paper web W in removing moisture. Permeable belt 32 in the belt press 18 running in the, thereby attaching the fabric 4 surface, so as to make the fabric 4 further pressen paper web W, whereby the paper web W pressure to the fabric to the fabric 7, the fabric is a honeycombed 7 list in general terms in the support. With 32 the physical pressure applied to the paper web W in water of some of the water pressure, so that the facing fabric 4 and 7 flow. As the paper web W, fabric 4 and 7 and with 32 to continue along the machine direction of the roll around M 9, its entering the vacuum zone Z, from the drying cylinder cover 11 in the area of the air flow, flowing through the permeable belt 32, flows through the fabric 4, so as to dry paper web W. The air flow from the paper web W of the further advance of moisture through the fabric 7 and a honeycombed 9 a porous surface. The permeable belt 32 in, from the drying cylinder cover 11 of the drying air through the through hole 36, the flow through the fabric 4 along the groove before 40 distribution. When the paper web W away from the belt press 18, the, belt 32 and fabric 4 separation. Within a short period of time after, the fabric 7 and the paper web W separation, paper web W to continue to the fabric 4 through the vacuum together receipt unit 12, the field from fabric unit volume 4 and paper web W extracting moisture.

Compared with the standard shoe press, with a permeability of the present invention 32 can be in the extremely long extended nip applying linear pressure, thereby ensuring that the long period of time, at the time the pressure is applied to the paper web W. This leads to very low specific pressure, thereby reducing compression and increase the quality of the paper sheet. The invention further allows flow of the paper web in the extended nip through vacuum and at the same time press dewatering.

Figure 20 is shown for processing the web 112 and a high level of dewatering system 110. System 110 includes an upper fabric 114, a honeycombed 118, dewatering fabric 120, belt-type press assembly 122, drying cylinder cover 124 (which may be a hot air drying cylinder cover), vacuum suction box 128, one or more spraying unit 130, one or more of white water recovery device 132, one or more of heater unit 129. Fiber material web 112 usually from the right side into the system 110, as shown in Figure 12. Fiber web 112 is pre-formed paper web (i.e., by a not shown device pre-forming), the fabric 114 is. In Figure 9 can be seen, water-absorbing device (not shown but with diagram 9 in device 16 similar) can provide the paper web 112 of the one side, at the same time suction roll 118 to provide the paper web 112 of the opposite side.

Fabric 114 mobile M along the machine direction of the web 112, through the one or a plurality of guide rollers. Although not necessary, however, before reaching the suction roll, the web 112 sufficient moisture may have been removed, so as to achieve the operation are usually or nominal 20gsm paper web about 15% to about 25% solid content. This can be through the (not shown) in vacuum of about -0.2 to about -0.8 pakistani vacuum level of the vacuum to achieve, preferably of the operating level is about -0.4 to about -0.6 bar.

When the fiber web 112 M during the running of the machine direction, its contact dewatering fabric 120. Dewatering fabric 120 can be an endless belt, which is a plurality of guide rollers guiding and is guided around the suction roll 118. Paper web 112 and then to the fabric to the fabric 114 and dewatering fabrics 120 a vacuum between 118 motion. A honeycombed 118 can be a drive roller, rotating M along the machine direction, and at about -0.2 to about -0.8 work under a vacuum level, preferably at least about the level of the work of -0.4 bar. By means of non-restrictive example, roller 118 a vacuum the thickness of the shell can be a 25 mm to 50 mm. Z is in the through the stick to the web 112 of the air flow rate. Fabric 114, paper web 112 and dewatering fabric 120 is guided by the vacuum roller 118 and permeable belt 134 forming the belt press 122. As shown in Figure 12, permeable belt 134 is simple root for no reason endless belt, which is a plurality of guide rollers guiding and press roll 118, thereby forming a belt-type press 122. In order to control and/or adjusting belt 134 tension, provide tension adjusting roller TAR as one of the guide rollers.

The peripheral length of a vacuum zone Z can be about 200 mm to about 2500 mm, preferably about 800 mm to about 1800 mm, more preferably about 1200 mm to about 1600 mm. Paper web 112 left in the vacuum roller 118 of the solid can be about 25% to about 55% change between the, vacuum pressure and the permeability depends on the tension of the belt and the length of the vacuum zone Z and paper web 112 in the vacuum zone Z of the residence time. Paper web 112 in the vacuum zone Z the residence time sufficient to cause the solid content is about 25% to about 55%.

Figure 20 of the press system is shown by the use of at least one upper layer or the 1st permeable belt or fabric 114, the at least one lower layer or 2nd tape or fabric 120 the paper web and 112, thereby forming a can be guided to pass through a roller 118 and permeable belt 134 forming the belt press 122 of the packing. Pressure generating element 134 of the surface of the 1st contact at least one of the upper fabric 114. Support structure 118 2nd surface contact of the at least one lower fabric 120, and it is permeable. The surface of the 1st and 2nd the difference holds the attention of the audience is arranged between the, act on the at least one upper and at least one lower fabric and disposed therebetween the packaging of the paper web. In in the system, in the packaging and therefore in the web 112 of generating the mechanical pressure. The mechanical pressure on the paper web 112 in generating a predetermined hydraulic pressure, so as to discharge the water-containing. An upper fabric 114 than a lower fabric 120 has higher roughness and/or compressibility. From the at least one upper fabric 114 to the at least one lower fabric 120 is generated in the direction of air flow, through the at least one upper layer 114 and at least one lower fabric 120 the paper web and 112 of the assembly.

An upper fabric 114 can be a permeable and/or of the so-called "structured fabric". By means of non-restrictive example, an upper fabric 114 can be such as the TAD fabric. Drying cylinder cover 124 can be replaced by steam box, steam box having a segmented (sectional) structure or design, so as to influence the moisture content of the paper web or drying transverse distribution.

Reference fig. 21, a lower fabric 120 can be film or fabric, which comprises a permeability base cloth and BF LG is connected with the grid, and a lower fabric 120 is made of a polymer such as polyurethane. Fabric 120 contact the side can be a grid of squeezing LG 118, and contact opposite sides of the web 112. Grille LG can be through various known techniques such as extrusion technique or screen printing technology fixed or arranged in the bottom cloth BF. As shown in Figure 21, to grid LG yarn relative to the machine direction and transverse MDY CDY the angle orientation of the yarn. Although the oriented such that there is no grid LG part and the machine direction yarns MDY linear arrangement, but can also use other orientation, an example as shown in Figure 22 the orientation. Although grid LG display has a relatively uniform grid form, but this form can also be a non-continuous and/or at least partially asymmetric. And, the interconnecting of the grille structure may be taken to the material between the circuitous route and is not substantially straight, as shown in Figure 21. Grille LG can also be made of synthetic material such as polymer or specifically polyurethane, its own the bonding performance via the inner BF is connected with the base cloth. The polyurethane preparation grille LG to its good friction performance, so that the well is fixed on the vacuum roller 118 on. This causes gas vertical flow and eliminate any "X, Y plane" leakage. The rate of air flowing through the grille of water sufficient to prevent the occurrence of any wet LG. Amount field, grille LG can be air permeability is about 35cfm or less, preferably about 25cfm the perforations of the hydrophobic thin film. Grille LG the hole or holes can be about 15 microns. Grille LG can provide good high-speed vertical gas flow, thereby preventing the re-wet. By means of fabric 120, can form or produce independent the surface structure of the woven pattern.

The reference Figure 22, as can be seen, the lower dewatering fabric 120 can have a contact vacuum roller 118 side, it also includes the permeability base cloth LG BF and grille. The bottom cloth BF includes machine direction multifilament yarns CDY MDY and transverse multifilament yarns, and is connected with the grid LG, thereby forming a so-called " against again wet level ". Grid can be made of the composite material, the material is for example the elastomeric material, it can be and Figure 21 is the same as shown in the grid. In Figure 22 can be seen, the grille LG itself can include the machine direction yarns GMDY, around these yarns EM formed with the elastic body material. Grille LG EM of the elastomer material and is formed on the machine-direction yarn of the composite standard pad GMDY (composite   grid mat). On this point, the grid machine-direction yarn in substantially parallel GMDY can be placed in the mould before a precoated with several rows of elastomeric material, the mould is used for re-heating EM elastic body material, so that it once again class Cheng Tu 22 LG shown in the pattern of the grid. EM other elastomer material can also be put in the mould. In order to form a composite layer, the grid structure LG then through the many technical in a connected BF the bottom cloth, the technique includes the grille LG BF laminated to the permeability of the substrate cloth, to maintain it in against the position of the permeability of the bottom cloth BF molten elastomer coated yarn or through the grille LG fusion on BF in permeability base cloth. Furthermore, adhesive may be used to the grille LG BF fixed on the permeability of the base cloth. LG should be capable of good composite layer with the vacuum roller 118 sealing, in order to prevent the "X, Y plane" and the vertical air flow to prevent the leakage of the re-wet. The use of such fabric, or generates an independent can be formed in the surface structure of the woven pattern.

Figure 21 and 22 with shown in 120 also can be used to substitute for the Figure 9 with the device 20.

Figure 23 in the press is a possible. Water-absorbing support surface for supporting the SS fabric 120,114,134 and paper web 112. Water-absorbing support surface SS SO with water-absorbing hole. As shown in Figure 24 for use example water absorption device of the type concerned, the surface of the SS can usually are straight. Preferably, suction surface SS is suction roll 118 the bending movement of the roll (  roll belt moving   curved) or a jacket. At this moment, with 134 can be the the tension of the said spiral seamed belt. Belt 114 can be structured fabric, and with 120 can be the above-mentioned types of dewatering felt. In this arrangement, from the moist air with 134 and above through a belt 114, paper web 112 and with 120, ultimately SO and enter the suction roll through the opening hole 118. Figure 24 shows another kind of the water-absorbing surface may be SS is arranged to suction roll 118 or bending movement of the roll jacket, with 114 can be SPECTRA film. At this moment, with 134 can be the the tension of the said spiral seamed belt. With 120 can be the above-mentioned types of dewatering felt. In this device, from the moist air with 134 and above through a belt 114, paper web 112 and with 120, ultimately SO and enter the suction roll through the opening hole 118.

Figure 25 shows another mode, in which the paper web 112 can be dried. At this moment, permeability support fabric SF (which can be the fabric 20 or 120 similar) move above the in the suction box SB. Suction box SB S sealing the use of strip with the lower side surface SF. Supporting belt 114 has the form of a TAD fabric carrying the web and 112 with PF into a, is arranged on the press apparatus PD, supporting with SF and the fixed suction box SB formed in the press. PF circulating press belt can be of the type and/or Figure 26 and 27 the tension of the of the type shown in the spiral suture with. With PF can also be alternative is concave troughed belt and/or which may be permeable. In this arrangement, the press device with SF PD using PF PF the pressure of the press belt, at the same time with the suction box SB to SF, paper web 112 and with 114 vacuum is applied. In the press process, can be at least from the belt 114, paper web 112 and damp air out in SF, and finally enters into the suction box SB.

An upper fabric 114 can be the web 112 to the compressor and/or pressing system, and from the compressor and/or pressing system conveying the web 112. Paper web 112 can be located in an upper fabric 114 in the three-dimensional structure, so it is not straight, but also having a three-dimensional structure, the structure to produce Takamatsu karton web. A lower fabric 120 is also permeable. A lower fabric 120 can lead to the design of the water storage. A lower fabric 120 also has a smooth surface. A lower fabric 120 is preferably a blanket of flocculent layers. A lower fabric 120 the flocculent fiber diameter can be equal to or less than about 11 dtex, preferably equal to or less than about 4.2 dtex, more preferably equal to or less than about 3.3 dtex. Flocculent fiber can also be a blend of fibers. A lower fabric 120 can also contain vector layer, it contains at least about 67 dtex fiber, and can contain even more coarse fiber (  fiber even   courser), for example, has at least about 100 dtex, at least about 140 dtex the minute counts especially of or even higher. For the good water absorption is important. A lower fabric 120 of the fabric and/or lower layers of the flocculent layer 120 itself can be wetted surface is equal to or greater than about 35 m²/m² blanket area, is preferably equal to or greater than about 65m²/m² blanket area, most preferably equal to or greater than about 100m²/m² blanket area. A lower fabric 120 coefficient of the surface of the should be equal to or greater than about 0.04 m²/g weight, is preferably equal to or greater than about 0.065m²/g weight, most preferably equal to or greater than about 0.075m²/g weight. For the good water absorption is important.

An upper fabric 114 compressibility (pressure-induced change in thickness of, mm/N) is less than a lower fabric 120. In order to keep the web 112 of the three-dimensional structure, in other words, in order to ensure that the upper layer 114 is a rigid structure, this is an important.

Consideration should be given to the lower layer fabric 120 elastic. A lower fabric 120 should be equal to or greater than the density of about 0.4g/cm³, is preferably equal to or greater than about 0.5g/cm³, ideally equal to or greater than about 0.53g/cm³. This speed is larger than the paper web 1200m/min is favourable. Reduced blanket volume under the action of the water flows out of the gas stream to blanket 120, even if the water flowing through the blanket 120. Therefore, the dewatering effect is lower. A lower fabric 120 can be lower than the permeability of about 80cfm, preferably lower than 40cfm, ideally is equal to or lower than the 25cfm. The water permeability of the reducing effect of the air flow in a more easily leave the blankets 120, even if the water flowing through the blanket 120. Therefore, re-wet effect is low. However, too high too open due to the permeability of the structure of the gas flow cause the too high, for a given vacuum pump and more low vacuum level, and lower blankets the dewatering effect.

2nd surface of the supporting structure, i.e., supporting belt 120 surface, can be straight and/or planar. On this point, the SF 2nd surface of the support structure can be formed by straight suction box SB. 2nd SF supporting structure of the surface is preferably a curve. For example, the SS 2nd surface of the support structure can be in the suction roll 118 or the diameter is about g.t. 1m formed on the cylinder of the suction roll or run 118 or the diameter is about g.t. 1m cylinder. Suction roll 118 or cylinder 118 can include at least one Z stick. It also may include two stick to the Z1 and Z2, as shown in Figure 28. Water-absorbing cylinder 218 may also include at least one suction box, with at least one thereof absorbing water arc. At least one mechanical pressure zone can be formed by at least one pressure field (i.e., through the tension of the belt) or, for example, by via the 1st surface of the pressing element. 1st surface may be non-infiltration strip 134, 1st, however, opening up towards the surface of the fabric 114, for example, with grooves or drills blindly and with the open surface of the groove, so that the air can enter from the outside water-absorbing arc. 1st the surface can be a permeable belt 134. The belt can have at least about 25%, preferably greater than about 35%, most preferably greater than about 50% of the opening regions. With 134 can have at least about 10%, at least about 25%, preferably up to about 50% of the contact area, which has a good press contact.

Figure 28 is shown for processing the fiber web 212 to the other of the high level of dewatering system 210. System 210 includes an upper fabric 214, a honeycombed 218, dewatering fabrics 220 and belt press assembly 222. Not shown other optional features include drying cylinder cover (which may be a hot air drying cylinder cover), one or a plurality of vacuum suction box, one or more spraying unit, one or a plurality of white water recovery device and one or a plurality of heater unit, as shown in Figure 9 and 20. Fiber material web 212 generally from the right side into the system 210, as shown in Figure 29. Fiber web 212 paper web that are pre-molded (i.e., by a not shown device pre-forming), the fabric 214 on. In Figure 9 can be seen, water-absorbing device (not shown but with diagram 9 in device 16 similar) can provide the paper web 212 on one side of the water-absorbing, at the same time suction roll 218 to provide the paper web 212 of the opposite side.

Fabric 214 (can be TAD fabric) mobile M along the machine direction of the web 212, through the one or a plurality of guide rollers. Although not necessary, however, in reaching the suction roll 218 before, the web 212 sufficient moisture may have been removed, the operation of the so as to achieve the usual or nominal 20gsm paper web about 15% to about 25% solid content. This can be through the vacuum box (not shown) of about -0.2 to about -0.8 pakistani vacuum level of the vacuum level to realize, preferably of the operating level is about -0.4 to about -0.6 bar.

When the fiber web 212 M when the direction of operation of the machine, its contact dewatering fabrics 220. Dewatering fabrics 220 (can be of any type described herein) can be an endless belt, which is a plurality of guide rollers guiding and is guided around the suction roll 218. Paper web 212 to the fabric to the fabric then 214 and dewatering fabrics 220 a vacuum between 218 movement. A honeycombed 218 can be a drive roller, rotating M along the machine direction, and at about -0.2 to about -0.8 work under a vacuum level, preferably at least about the level of the work of -0.4 bar. By means of non-restrictive example, roller 218 can be the thickness of the outer shell a vacuum is 25 mm to 75 mm. Through the stick to the Z1 and Z2 in the web 212 of the average airflow rate can be about 150m³/min machine width per metre. Fabric 214, paper web 212 and dewatering fabrics 220 is to be directed through the vacuum roller 218 and permeable belt 234 forming belt press 222. As shown in Figure 28, permeable belt 234 is simple root for no reason endless belt, which is a plurality of guide rollers guiding and press roll 218, thereby forming a belt-type press 122. In order to control and/or adjusting belt 234 tension, one of the guide rollers can be a tension adjusting roller. The arrangement also includes arranged on the belt 234 press device. JB press device comprises a radial bearing, one or more of brake A, one or more and preferably is perforated PS of the press block.

At least vacuum zone Z2 the circumferential length may be about 200 mm to about 2500 mm, preferably about 800 mm to about 1800 mm, more preferably about 1200 mm to about 1600 mm. Leave the vacuum roller 218 of the web 212 of the solid can be about 25% to about 55% change between, depends on the vacuum pressure and the permeable belt 234 the tension, the pressure from the press device and PS/A/JB vacuum zone Z2 and the length of the web 212 in the vacuum zone Z2 the dwell time of the in. Paper web 212 in the vacuum zone Z2 enough to cause the dwell time in the the solid content is about 25% to about 55%.

Figure 29 is shown for processing the web 312 to the other of the high level of dewatering system 310. System 310 includes an upper fabric 314, a honeycombed 318, dewatering fabrics 320 and belt press assembly 322. Not shown other optional features include drying cylinder cover (which may be a hot air drying cylinder cover), one or a plurality of vacuum suction box, one or more spraying unit, one or a plurality of white water recovery device and one or a plurality of heater unit, as shown in Figure 9 and 20. Fiber material web 312 generally from the right side into the system 310, as shown in Figure 29. Fiber web 312 paper web that are pre-molded (i.e., by a not shown device pre-forming), the fabric 314 on. In Figure 9 can be seen, water-absorbing device (not shown but with diagram 9 in device 16 similar) can provide the paper web 312 on one side of the water-absorbing, at the same time suction roll 318 provides the paper web 312 of the opposite side.

Fabric 314 (can be TAD fabric) mobile M along the machine direction of the web 312, through the one or a plurality of guide rollers. Although not necessary, however, in reaching the suction roll 318 before, web 312 sufficient moisture may have been removed, the operation of the so as to achieve the usual or nominal 20gsm paper web about 15% to about 25% solid content. This can be through the vacuum box (not shown) of about -0.2 to about -0.8 pakistani vacuum level of the vacuum level to realize, preferably of the operating level is about -0.4 to about -0.6 bar.

When the web 312 M when the direction of operation of the machine, its contact dewatering fabrics 320. Dewatering fabrics 320 (can be of any type described herein) can be an endless belt, which is a plurality of guide rollers guiding and is guided around the suction roll 318. Paper web 312 and then to the fabric to the fabric 314 and dewatering fabrics 320 a vacuum between 318 movement. A honeycombed 318 can be a drive roller, rotating M along the machine direction, and at about -0.2 to about -0.8 work under a vacuum level, preferably at least about the level of the work of -0.4 bar. By means of non-restrictive example, roller 318 a vacuum the thickness of the shell can be a 25 mm to 50 mm. Through the stick to the Z1 and Z2 of the paper web in the 312 of the average airflow rate can be about 150m³/min machine width per metre. Fabric 314, paper web 312 and dewatering fabrics 320 is guided by the vacuum roller 318 and permeable belt 334 forming the belt press 322. As shown in Figure 29, permeable belt 334 is simple root for no reason endless belt, which is a plurality of guide rollers guiding and pressen vacuum roller 318, thereby forming a belt-type press 322. In order to control and/or adjusting belt 334 tension, one of the guide rollers can be a tension adjusting roller. The arrangement also includes arranged on the belt 334 press roll in the RP. RP may be a pressing roller press device, can be arranged on the vacuum zone Z1 or before the position of the optional OL set up in two separate regions Z1 and Z2 between.

At least vacuum zone Z1 the circumferential length may be about 200 mm to about 2500 mm, preferably about 800 mm to about 1800 mm, more preferably about 1200 mm to about 1600 mm. Leave the vacuum roller 318 paper web 312 of the solid can be about 25% to about 55% change between, depends on the vacuum pressure and the permeable belt 334 the tension, the pressure from the press device and RP vacuum zone Z1 and Z2 and the length of the web 312 in the vacuum zone Z1 and Z2 the dwell time of the in. Paper web 312 in the vacuum zone Z1 and Z2 enough to cause the dwell time in the the solid content is about 25% to about 55%.

Figure 28 and 29 is shown with the following advantages: if we do not need to be very Takamatsu thick paper web, is by carefully adjusting the mechanical pressure load, this choice can be used to increase the yield of dryness and will therefore be increased to the desired value. Because of the relatively soft fabric 2nd 220 or 320, in the three-dimensional structure 214 or 314 (valley) between the dots at least partially press paper web 212 or 312. Can be preferably in the water-absorbing region (no longer wet) before, or after additional pressure field disposed therebetween. The upper permeable belt 234 or 334 is designed to resist greater than about 30 and preferably about 50 or more such as about 80KN/M tension. Through the use of the tension, the generated pressure is greater than about 0.5 bar, preferably about 1 bar or higher, can be example as promised 1.5 bar. According to the known formula p=S/R, depends on the tension of the pressure "P" "S" and "R" the radius of the suction roll. The upper chord 234 or 334 can also be stainless steel and/or metal and/or polymer with. Permeability the upper chord 234 or 334 can be made of reinforced plastic or synthetic material. It may also be a spiral suture fabric. Preferably, the tape 234 or 334 can be driven in order to prevent fabric 1st 214 or 314, 2nd fabric 220 or 320 and paper web 212 or 312 the shearing force between the. Suction roll 218 or 318 also can be driven. These components can be independently driven.

Permeable belt 234 or 334 can be perforated block PS support, to provide a pressure load.

Air flow can be formed by non-mechanical pressure field the following form: the use of suction roll (118,218 or 318) or the negative pressure in the cap by means of straight suction box SB (see Figure 25). Can also use the pressure generating element 134, PS, PR, 234 and 334 of the overvoltage on the surface of the 1st, for example by means of a drying cylinder cover 124 (although not shown, but can in Figure 25, 28 and 29 is shown arranged in the device for drier cover) supply of air, for example about 50 the [...] to about 180 the hot air [...] , preferably about 120 the [...] to about 150 the [...] , also preferably steam. If the leave the headbox of the paper pulp temperature of less than about 35 the [...] , such a high temperature is particularly important and preferred. This is not for slurry of fine grinding or low level of slurry for the production of the grinding. Of course, can make the above-mentioned all or part of the characteristic, in order to form a favorable pressen device.

The pressure in the drying cylinder cover can be less than about 0.2 bar, preferably less than about 0.1, most preferably less than about 0.05 bar. The supply to the drying cylinder cover can be less than the velocity of flow of the air flow is equal to or, preferably, by means of a vacuum pump from the suction roll (118,218 or 318) the velocity of flow of the water.

Suction roll 118,218 and 318 can be fabric 114,214 or 314 and 120,220 or 320 assembly and a pressure generating element, such as with 134,234 or 334 wrapped partially, the fabric for example by the 2nd 220 has a largest package radin " a2   [...] and finally leave the larger arch area Z1 (see fig. 28). Paper web 212 and 1st fabric 214 a to leave the 2nd position (the 1st arch area Z2 before the end of the of), pressure generating element PS/234 the first to leave. Pressure generating element PS/234 greater than the radian of the radian stick " a2   [...] radian. This is important, because of the low degree of dryness, mechanical dewatering than airflow dewatering more effective. A small water absorption radin " a1   [...] should be large enough to ensure that the air current has sufficient retention time in order to reach maximum drying degrees. Dwell time T should be greater than about 40ms, preferably greater than about 50ms. For approximately 1.2m of about roller diameter 1200m/min the purposes of the machine speed, radians " a1   [...] should be greater than about 76 degrees, preferably greater than about 95 degrees. Formula is:a1= [retention time * rate * 360/roller perimeter of].

2nd fabric 120,220,320 can be, for example, is added to the steam in the overflow nip or process water heating, in order to improve the dewatering performance. High temperature so that the water is easy to flow through the blanket 120,220,320. The tape 120,220,320 also can be heater or the drying cylinder cover such as 124 heating. Particularly in the thin sheet of paper of a former of a paper machine is the shaper double net , TAD-fabric 114,214,314 can be heated. This is because, if the shaping device is lunular shaper, the TAD fabric 114,214,314 forming the package will be therefore and roller headbox injected the slurry heating.

The method of use of the device described herein have many advantages. In the prior art in the TAD method, needs to be 10 a vacuum pump to the paper web drying to about 25% of the drying degree. On the other hand, the advanced dewatering system of the present invention, only need to 6 a vacuum pump to the paper web drying to about 35%, but also, the use of the prior art TAD process, the web must be dried to about 60% to about 75% of the high drying level, otherwise they will be adverse moisture transverse distribution. The system of this invention can make the paper web is dried in the 1st step to about 30% to about 40% of the specific drying level, has good lateral distribution of the water. In the 2nd step, the system of this invention can be used with combined conventional Yuncker type dryer the drying increases to greater than about 90% of the final drying degrees. Generating the drying level of a method can include with the aid of the Yuncker type drying cylinder of the drying cylinder cover for more effective drying.

The present invention by referring to the full contents of the following documents incorporated into the present invention: of Jeffrey   HERMAN No. 10/972 the United States Patent application, 431, in the press section of a paper machine with, and permeability (proxy volume number No. P25760). United States Patent application filed 30 January 2004 No. 10/768, 485 full content of all incorporated herein by reference.

It should be noted that, the above embodiment is only provided for purposes of explanation, is not to be understood as limiting of the present invention. Although exemplary embodiments have been combined the present invention are described, it should be understood the terminology used the terminology is described and illustrative, rather than restrictive. Without departing from the spirit of this invention and on the premise of the range, and as herein shown can be modified, the scope of the rights requested changes in the book. Although the particular device have been combined, material and embodiment of the invention is described, but this invention is not limited to the disclosed details. The invention attempts to cover all functionally equivalent structures, methods and uses, such as rights of those within the scope of the claims.