Viscoelastic Extrusion Processing Method and Compositions for Biopolymers

A viscoelastic extrusion process (VEEP) for biopolymers such as polylactic acid is provided. The VEEP process removes many processing and performance limitations of PLA as well as creates performance sufficient to produce durable “nonbiodegradable” products as a direct replacement for PVC and other petrochemical profile and sheet extrusion applications. The VEEP process also retains a high degree of crystallinity within the PLA for increasing toughness and to lower its biodegradability. The invention also includes an integral process wherein rheology is highly modified to allow profile extrusion and higher melt strength wherein processing is lower than the melting point of the primary biopolymer and below the browning points of the natural fibers in the biopolymers viscoelastic state.

Apparatus and method for the production o fplastic granulate

The invention relates to a method and a device for producing plastic granulate, having a granulator which breaks up essentially continuously conveyed plastic mass flow into granulate particles, the granulator ( 17, 40 ) comprising a cutting unit ( 21, 22; 32, 33, 34 ), whose cutting elements engage on the plastic mass flow when breaking up the plastic, and the device ( 1, 31 ) comprising at least one oscillation sensor ( 24, 25; 60, 61 ), using which oscillations occurring on the device ( 1, 31 ), in particular on the granulator ( 17, 40 ), may be detected.

Extrusion process and device for producing elastomeric compounds

An extrusion device for producing elastomeric compounds, includes a holding body internally confining a chamber and at least one extrusion screw disposed in the chamber. The device further includes a plurality of interchangeable extrusion heads alternatively installed on the holding body at a discharge opening of the chamber. The choice of using a type of head rather than another or leaving the discharge opening free is carried out based on the physico-chemical features of the elastomeric compound to be treated, so as to maintain the temperature and/or pressure of the outgoing compound under critical threshold values for such a compound.

Method of detecting a component of an article and method of preparing a component for detection

A method of detecting the presence or position of a first component in an article is disclosed. The first component, which has a predefined response to incident light, includes a microporous film of a semi-crystalline polyolefin and a beta-nucleating agent. The method includes irradiating the article with incident light, detecting light received from the irradiated article; and identifying the predefined response of the first component in the light received from the irradiated article to detect the presence or the position of the first component. A method for preparing a mechanical fastening component for use in an article is also disclosed. The method includes stretching a film backing containing beta-spherulites and having upstanding fastening elements to provide a microporous film backing with sufficient porosity to allow it to be detected when subjected to an inspection system comprising a light detector.

Method for starting up a processing plant for producing plastics material granulate and processing plant for producing plastics material granulate

In a processing plant for producing plastics material granulate, the start-up takes place in such a way that a screw machine is firstly driven by means of a drive device and then plastics material to be processed is fed by means of a metering device into the screw machine. At least one conveying position of the plastics material in the screw machine is determined by means of a control device by evaluating at least one measuring signal. Depending on the conveying position determined, a granulating device is activated and put into operation. The method according to the invention allows a direct start-up of the processing plant without the use of a start-up valve. This ensures an easy and safe start-up of the processing plant.

Silicone Tubing and Method for Making and Using Same

Silicone tube structures are formed having a particular dimensional accuracy. In one embodiment, a silicone tube structure can include an extruded hollow body having an inner bore. The extruded hollow body can have an inner diameter, an outer diameter, and a length of at least approximately 20 m. The extruded hollow body can also have a dimensional accuracy that is measured by the standard deviation of the inner diameter being no greater than approximately 0.8% of an average inner diameter of the extruded hollow body over the length. In an embodiment, the silicone tube structure can be cut to form a number of silicone tubes.

Weighing and Mixing System

The invention is a weigh ng and mixing system for the preparation of mixtures of components required by processing machines for the manufacture of plastic products. In particular the invention is suitable for the preparation of weighed mixtures comprised of at least two different masterbatches in order to obtain the color shade desired for a specific plastic product.

Process for in-line inspection of functional film layer containing detectable component

The continuity of a functional layer of a web (32, 60, 78) is assessed by forwarding the web, detecting (42, 63) the presence of the functional layer and a discontinuity and/or a thin region in the functional layer, and generating a signal in response to the discontinuity and/or thin region. The functional layer comprises a detectable component (360) in a thermoplastic composition. The detecting is carried out by a machine vision system capable of detecting the detectable component (360) in the functional layer. The detectable component (360) can be active or passive. Also included are systems for carrying out the process.

Method and device for the indirect determination of a specific formulation during extrusion

The invention relates to a method for the indirect determination of a specific formulation with an extrusion process in an extrusion device ( 10 ) comprising the following steps: determination of measurement data of at least one processing parameter of the extrusion process of the extrusion device ( 10 ), comparing the determined measurement data with saved data saved in relation to the specific formulation of the same processing parameter, determination of the deviation of the measurement data from the saved data of the same processing parameters and comparing of the deviation with a predefined deviation threshold.

METHOD FOR PERFORMING A MATERIAL CHANGE IN A FEEDING DEVICE OF AN EXTRUDER

The invention relates to a method for changing the material from a feed mixture to a subsequent mixture in a feed device of an extruder, comprising the following steps: detecting a change request for changing the material, emptying a mixing area of a mixing device of the feed device, identifying the completion of the emptying of the mixing area, and filling the mixing area of the mixing device with the subsequent mixture after the completion of the emptying has been identified. 1. A method for performing out a material change from a feed mixture to a subsequent mixture in a feed device of an extruder , comprising the following steps:detecting change request to execute the material change,emptying a mixing area of a mixing device of the receiving device,detecting the end of emptying the mixing area,filling the mixing area of the mixing device with the subsequent mixture after the detected completion of emptying,wherein at least one of the following steps is performed prior to emptying the mixing area:emptying at least one storage container which is mounted upstream of the mixing device,filling the storage container with a subsequent material for the subsequent mixture,emptying a dosing container which is arranged upstream of the mixing device and downstream of the storage container,filling the dosing container from the at least one storage container with the subsequent material of the subsequent mixture,wherein cascaded filling takes place so that, during operation with the feed mixture, first the storage container and then the dosing container are acted upon with the subsequent material or the subsequent mixture, while the extruder still processes the end of the current formulation conditions with the feed mixture.2. The method according to claim 1 , wherein claim 1 ,at least one of the following partial steps is performed for the step of emptying the mixing area:draining the feed mixture from the mixing area via a drainage opening,emptying the feed mixture into the ...

SYSTEM AND METHOD FOR EXTRUDING COMPOSITE FILAMENT

A method of extruding filament comprises the steps of cutting a bulk source material into pieces having size S, performing a first extrusion pass comprising the steps of melting the pieces in an extruding device at a temperature Tand extruding a first filament at an extrusion speed V, and performing at least one additional extrusion pass k comprising the steps of cutting the first filament into pieces having size S, melting the pieces in an extruding device at temperature T, and extruding a final filament at an extrusion speed V. A system for extruding filament is also described. 1. A method of extruding filament , comprising the steps of:{'sub': '1', 'producing pieces of source material having size S;'} [{'sub': '1', 'melting the first pieces in an extruding device at a temperature T; and'}, {'sub': '1', 'extruding a first filament from an extruding device having an extrusion screw, at an extrusion speed V; and'}], 'performing a first extrusion pass comprising the steps of [{'sub': 'k', 'cutting the first filament into second pieces having size S;'}, {'sub': 'k', 'melting the second pieces in an extruding device at temperature T; and'}, {'sub': 'k', 'extruding a final filament at an extrusion speed V.'}], 'performing at least one additional extrusion pass k comprising the steps ofwherein the matrix porosity of the final filament is less than the matrix porosity of the first filament.2. The method of claim 1 , wherein the bulk source material comprises polymer matrix syntactic foam.3. The method of claim 2 , wherein the bulk source material is HDPE.4. The method of claim 1 , further comprising the steps of:monitoring at least one temperature on the extruding device; andactivating at least one heater in order to maintain at least one temperature substantially constant.5. The method of claim 1 , wherein the first pieces of source material are produced by cutting a bulk source material.6. The method of claim 1 , wherein the first pieces of source material are produced ...

Methods for manufacturing bulked continuous filament

A method for manufacturing bulked continuous carpet filament, the method comprising: (1) reducing a chamber pressure within a chamber to below about 5 millibars; (2) after reducing the chamber pressure to below about 5 millibars, providing a polymer melt to the chamber; (3) separating the polymer melt into at least eight streams; (4) while the at least eight streams of the polymer melt are within the chamber, exposing the at least eight streams of the polymer melt to the chamber pressure of below about 5 millibars; (5) after exposing the at least eight streams of the polymer melt to the chamber pressure of below about 5 millibars, recombining the at least eight streams into a single polymer stream; and (6) forming polymer from the single polymer stream into bulked continuous carpet filament.

DEVICE AND METHOD FOR EXTRUDING PLASTIC

A device and a method for extruding plastics, comprising an extruder screw, a housing with a cavity, a drive unit for rotatably driving the extruder screw, a heating element arranged on the housing alongside the extruder screw, a filling unit through which shredded plastic can be supplied into the cavity, and a filler metering device. Upon rotation, the extruder screw conveys the shredded plastic in the transport direction along a longitudinal axis of the extruder screw. The housing has a feeding port for the filler opening into the cavity, wherein the filler metering device is connected to the feeding port and is designed for supplying a filler dispersed in a gas stream into the cavity. 110.-. (canceled)11. A device configured to extrude plastics , comprising: an extruder screw , a housing with a cavity in which the extruder screw is rotatably arranged , a drive unit configured to rotatably drive the extruder screw , a heating element arranged on the housing alongside the extruder screw , a filling unit connected to the housing in a feed zone of the extruder screw and through which shredded plastic can be supplied into the cavity , wherein , upon rotation , the extruder screw conveys the shredded plastic in the transport direction along a longitudinal axis of the extruder screw , carrying the extruded plastic out of the cavity through a discharge port formed in the housing , and a filler metering device , and the housing has a feeding port opening into the cavity and configured to convey a filler into the cavity , and viewed in the transport direction , the feeding port is arranged upstream of the feed zone or in the feed zone of the extruder screw , and the filler metering device is connected to the feeding port and is configured to supply the filler into the cavity , as the filler is dispersed in a gas stream.12. A device according to claim 11 , wherein the housing has a discharge port opening into the cavity and the device comprises a suction device which is ...

Device for making foam pipes and method for making foam pipes

A device for making foam pipes and a method for making the foam pipes includes the use of critical micro foaming injection molding. The foaming agent and the foaming material are mixed and controlled under specific temperature to obtain micro bubbles in the wall of the foam pipes which need less material when compared with PVC pipes of same specification such that manufacturing cost is reduced.

Systems and methods for manufacturing bulked continuous filament

A method of manufacturing bulked continuous carpet filament which, in various embodiments, comprises: (A) grinding recycled PET bottles into a group of flakes; (B) washing the flakes; (C) identifying and removing impurities, including impure flakes, from the group of flakes; (D) passing the group of flakes through an MRS extruder while maintaining the pressure within the MRS portion of the MRS extruder below about 5 millibars; (E) passing the resulting polymer melt through at least one filter having a micron rating of less than about 50 microns; and (F) forming the recycled polymer into bulked continuous carpet filament that consists essentially of recycled PET.

Process for Manufacturing Panels for Floor and Wall Coverings

The present invention relates to a process for the production of panels for floor or wall coverings comprising the steps of mixing and homogenising raw materials, thereby obtaining a dryblend, extruding said dryblend, thereby obtaining one or more thermoplastic layers, laminating the afore-mentioned thermoplastic layers, thereby obtaining a panel for floor or wall coverings, wherein said raw materials and/or said dryblend are predominantly transported vertically downwards during the weighing, mixing and/or homogenising of said raw materials and during the feeding of said dryblend to extruders via feeding units,

Device and procedure for extrusion and application of spacer profile of an insulating glass

The present relates to a device and a procedure for the extrusion and application of a spacer profile of insulating glass, particularly for a machine adapted to compose the spacer frame directly against one or more glass panes constituting the insulating glass starting from a thermoplastic product prevalently contained in drums, displacing the extrados thereof to an adjustable and controlled distance referred to the margin of one or more glass panes. 1. A device for the extrusion and application of spacer profile of insulating glass , particularly for a machine adapted to compose the spacer frame directly against one or more of the glass panes constituting the insulating glass starting from a thermoplastic product , characterized in that at least one feeler located upstream of the extrusion nozzle identifies the position of the margin of the glass pane and transmits the position signal to a controller , which through the axes H , V , ϑ , driven by synchronous motors actuates the keeping of a mutual position of nozzle-margin of the glass pane at a distance p which can be set through the operator interface.222rlr. A device according to claim 1 , wherein claim 1 , at least for the completely curvilinear shape and polygonal shape with one or more curvilinear sides of the glass pane claim 1 , the position of the margin of the glass pane is identified by a camera or by another optical device located upstream of the extrusion nozzle.3. A device according to claim 1 , wherein the position of the margin of the glass pane is identified upstream by a scanner and transmitted to the controller.4. A device according to claim 1 , wherein the position of the margin of the glass pane claim 1 , acquired either from the type signals deriving from the sensors or from the information deriving from the scanner claim 1 , is processed by the controller according to algorithms which combine the needs of homogeneity of the parameter p with the aesthetic requirements of alignment of the ...

Extrusion device and extrusion method that produces a plastic film

An extrusion device that produces plastic film includes at least two feed units that feed feedstock to an extruder, wherein each feed unit has at least one discharge opening including a discharge closure to open and close the discharge opening, and a container interface that reversibly fastens a discharge container that accommodates feedstock discharged from the respective feed unit.

System and method for polymer extrusion

Techniques are provided for polymer extrusion. A polyolefin extrusion system may include an extrusion gear pump configured to receive a narrow molecular weight distribution polyolefin from a polyolefin manufacturing system. The polyolefin extrusion system may also include a motor of the extrusion gear pump configured to drive the extrusion gear pump, a pressure sensor configured to generate a pressure signal indicative of a suction pressure into the extrusion gear pump, an automation controller configured to generate an output signal based on the pressure signal, and a variable speed drive configured to control operation of the motor.

Precise extrusion and transfer apparatus for light guide plate production

The present invention discloses a precise extrusion and transfer apparatus for light guide plate production, including: a feed hopper; a dehumidifying and drying device; a screw conveyor fixedly mounted on one side of the outer wall of the dehumidifying and drying device; a screw extrusion device; and a molding box fixedly mounted with first motors and a second motor on one side of the outer wall by means of bolts, where power output ends of two sets of first motors pass through the molding box and are fixedly mounted with first precise roller bearings by means of rotating shafts, and a power output end of the second motor passes through the molding box and is fixedly mounted with a second precise roller bearing by means of a rotating shaft. According to the present invention, one-step molding from a particle base material to a finished light guide film is implemented, the problem of warpage is overcome, the production efficiency is improved, and the production cycle can be shortened to 1 s; and the product is thinner and can be as thin as 80 μm, the production costs such as material consumption and labor are greatly reduced, key indicators of the product such as brightness and light transmittance of the light guide film are comprehensively improved, and the advantages in quality and costs are enabled in fierce market competition.

PROCESS FOR DRYING POLYMERIC GRANULAR MATERIAL AND SYSTEM OPERATING ACCORDING TO SAID PROCESS

A process for drying polymeric granular material () comprises the steps of: —introducing into said drying hopper () a process gas having a predefined flow rate so as to heat and dry the polymeric granular material, —discharging a portion of the heated polymeric granular material into a transformation unit () for the polymeric material; —loading an amount of fresh polymeric granular material () into the drying hopper. The process gas flow rate is regulated by measuring the inlet temperature of the fresh polymeric granular material () and comparing it with a predefined inlet temperature of the fresh polymeric granular material, on the basis of which the predefined process gas flow rate has been calculated. If the measured inlet temperature is different from the predefined inlet temperature, the flow rate of the process gas is regulated on the basis of the measured inlet temperature. 12. Process for drying polymeric granular material () , comprising:{'b': '10', 'providing said polymeric granular material in a drying hopper (),'}introducing into said drying hopper a process gas having a predefined flow rate and temperature so as to heat said polymeric granular material to a predefined discharging temperature and to dry said polymeric granular material to a predefined residual moisture value,{'b': '100', 'discharging a portion of said polymeric granular material heated to said discharging temperature into a transformation unit () for said polymeric material;'}{'b': '2', 'i': 'a', 'loading an amount of fresh polymeric granular material () having an inlet temperature into said drying hopper,'}measuring said inlet temperature and comparing it with a predefined inlet temperature of said polymeric granular material, on the basis of which said predefined process gas flow rate has been calculated, andif said measured inlet temperature is different from said predefined inlet temperature, regulating the flow rate of said process gas on the basis of said measured inlet temperature ...

Wet grain drying system and method

A device according to various embodiments for drying wet grain can include a first screw configured to receive wet grain. A second screw receives the wet grain from the first screw. At least one mechanism is included within at least one of the first screw and the second screw to vaporize water content in the wet grain.

High melt strength polypropylene and process of preparation thereof

A high melt strength resin composition includes at least a) non-functionalized polypropylene, b) at least one acrylate such as zinc diacrylate, calcium diacrylate or aluminum triacrylate in a total amount of from 0.1 to 5% by weight based on the weight of non-functionalized polypropylene, and c) at least one acid neutralizer in a total amount of from 0.005 to 5% by weight based on the total weight of the at least one acrylate. The resin composition is compounded at a processing temperature between 185° C. and 260° C. to obtain the high melt strength polypropylene.

Variable frequency drive combined with flow limiter set for limiting flow to selected level above design choice

Apparatus has a vacuum pump for conveying granular plastic resin material from a supply to receivers retaining and dispensing resin when needed by a process machine with a flow limiter connected to the suction head of the vacuum pump, with the vacuum pump being a controlled, variable speed device.

Flow limiting and variable frequency drive apparatus for limiting flow to selected level

A controlled, variable speed vacuum pump with a flow limiter connected to the suction head of the vacuum pump conveys granular plastic resin material from a supply to receivers retaining and dispensing resin when needed by a process machine.

Spinneret assembly for spinning polymeric fibers

A spinneret assembly for spinning polymeric fibers, including: (a) a cap provided with an inlet port and a flared lower surface that flares outwardly from the inlet port in the direction of flow; (b) a spinneret having numerous spinning flow channels through its thickness; (c) a filter freely resting on the spinneret; and (d) a flow guide with a tapered geometry mounted in a cavity defined by the cap and the spinneret. The flow guide has an apex facing the inlet port, a base facing the filter, and one or more side surfaces tapering up to the apex. A diverging flow passage is defined by the tapering side surface(s) of the flow guide and the cap's flared lower surface. The base of the flow guide is spaced apart from an upper surface of the spinneret, creating a space that is in fluid communication with the divergent flow passage.

METHOD FOR INDIRECTLY DERIVING A SYSTEMATIC DEPENDENCY BETWEEN A SETTING PARAMETER AND AN OPTICAL PROPERTY OF A FILM WEB, METHOD FOR ADAPTING THE QUALITY OF A FILM WEB

The invention relates to the determination of the optical quality of a film. On the one hand, a correlation of the obtained measured values with the production parameters, which are detected in a time-synchronous manner at the extrusion plant, is carried out. On the other hand, a correlation of said obtained measurement data with the geometric and/or functional properties of a film, for example the water vapor permeability, is carried out. The obtained correlation of data is used in the process for controlling the running production process of the film to an optimum operating point. Consequently, the resulting functional properties of a film are improved in an automated manner and met according to the desired specifications. The operator can predetermine which geometric and/or functional properties of a film are accepted as a control variable. 1.2.3. Method for indirectly deriving a systematic dependency in a blown film or cast film production process of a film web between a setting variable of the manufacturing process and an optical property of the produced film web ,characterized in thatan optical property of the film web is determined as a first parameter of the process inline on the produced film web by means of a sensor,a second parameter of the method is determined, in particular a parameter of the manufacturing device from the production of film web, in particular the setting variable of the production process is determined,a data detection system digitalizes and records the parameters as needed,the determinate parameters are stored in an orderly manner, related to each otherand from the, in a data base stored, data the dependence between the parameters is derived systematically.2. Method according to claim 1 , characterized in that the specific dependence of the parameters is determined in form of a coefficient of determination comprising curve.3. Method according to claim 1 , characterized in that the specific dependency of the parameters is determined by ...

Systems and methods for manufacturing bulked continuous filament

A method of manufacturing bulked continuous carpet filament which, in various embodiments, comprises: (A) grinding recycled PET bottles into a group of flakes; (B) washing the flakes; (C) identifying and removing impurities, including impure flakes, from the group of flakes; (D) passing the group of flakes through an MRS extruder while maintaining the pressure within the MRS portion of the MRS extruder below about 5 millibars; (E) passing the resulting polymer melt through at least one filter having a micron rating of less than about 50 microns; and (F) forming the recycled polymer into bulked continuous carpet filament that consists essentially of recycled PET.

Screw machine and method for the processing of material to be processed

A screw machine includes an inductive heating device for processing of material to be processed. The inductive heating device is used to heat the material in a heating zone. In the heating zone, at least one housing portion is made of an electromagnetically transparent material at least partly, the material being non-magnetic and electrically non-conductive, whereas at least one treatment element shaft is made of an electrically conductive material at least partly. The inductive heating device includes at least one coil formed integrally with a component of the at least one housing portion, in particular in such a way as to form a hybrid component. During the processing of the material, the inductive heating device generates an alternating magnetic field that produces eddy current losses in the at least one treatment element shaft, the eddy current losses leading to a temperature increase of the at least one treatment element shaft.

MACHINE SYSTEM FOR PRODUCING OR TREATING SYNTHETIC THREADS

Techniques involve a machine system for producing or treating synthetic threads, comprising a plurality of machine components, having actuators and/or sensors, that are associated with a plurality of control components. The control components are connected by a machine network to a central machine control station. In order to remedy process disruptions as quickly as possible and to ensure uniform product quality, the control components are coupled in parallel to a central analysis station by an analysis network. 1. A machine system for producing or treating synthetic yarns , comprising a plurality of machine components having actuators and/or sensors , and comprising a plurality of control components which are associated with the machine components for controlling , wherein the control components are connected to a central machine control station via a machine network , wherein the control components are coupled in parallel to a central analysis station via an analysis network.2. The machine system as claimed in claim 1 , wherein the analysis network is formed by means of a real time-capable bus system for data transmission.3. The machine system as claimed in claim 1 , wherein the machine network is formed by means of an Industrial Ethernet for data transmission.4. The machine system as claimed in claim 1 , wherein the control components to have at least two network connections claim 1 , wherein one of the network connections is configured as a real-time network connection.5. The machine system as claimed in claim 1 , wherein the machine control station is connected to the analysis network via a separate real-time network connection.6. The machine system as claimed in claim 1 , wherein the central analysis station has an Internet interface claim 1 , and the central analysis station is connected to an external diagnosis station.7. The machine system as claimed in claim 1 , wherein the central analysis station and the central machine control station are interconnected ...

Pet processing system and method

Disclosed are a system and method tuning PET raw material processing process by employing real time process management and machine learning steps and reactive addition of dosing of homogenizing composition for impregnating chain extenders and compatibilizing agents in thermoplastic resin using the liquid additive as a carrier into the process for modifying material performance. The properties of PET blend are no longer fixed once dry-blending and melting is complete.

Rubber Extrusion Device and Method for Manufacturing Rubber Extrudate

A rubber extrusion device includes a head mounted with a die having: an extrusion port variable member disposed at a front end position of an extrusion flow path to move in a direction allowing an area of an extrusion port to change; and a rectifying body that enters and exits the extrusion flow path from a front end side of the extrusion flow path. A rubber extrudate is manufactured by: positioning the extrusion port variable member at a desired position in its movement direction; positioning the rectifying body at a desired position by moving the rectifying body in an extension direction of the extrusion flow path while being in contact with an inner wall of the extrusion flow path; and extruding unvulcanized rubber from the extrusion port by feeding the unvulcanized rubber into the extrusion flow path.

System and method for blending polymers

The present techniques provide an extruder screw comprising a high shear melting and mixing zone starting a distance away from an entry point of the screw corresponding to 35%-50% of the overall screw L/D. The extruder screw may also include elements capable of increasing a degree of fill of the high shear melting and mixing zone. In accordance with present techniques, the extruder screw is configured to blend two or more polyolefin polymers having greater than about a 200,000 difference in weight-average molecular weight in a single extrusion step. The extruder screw of the present techniques may be used in a single screw or twin screw extruder, and may be incorporated into a polyolefin production plant for producing multi-modal resins.

System and method for polymer extrusion

Techniques are provided for polymer extrusion. A polyolefin extrusion system may include an extrusion gear pump configured to receive a narrow molecular weight distribution polyolefin from a polyolefin manufacturing system. The polyolefin extrusion system may also include a motor of the extrusion gear pump configured to drive the extrusion gear pump, a pressure sensor configured to generate a pressure signal indicative of a suction pressure into the extrusion gear pump, an automation controller configured to generate an output signal based on the pressure signal, and a variable speed drive configured to control operation of the motor.

Low energy processing of thermoplastic polymers

In the operation of a melter/mixer-gear pump system for processing of synthetic thermoplastic materials, the improvement is disclosed which comprises employing the pressure between the melter/mixer and the gear pump as the controlling parameter which affects, in a proportional relationship, the speed of the gear pump, the energy transmitted to and the consequent temperature of the materials passing through said melter/mixer.

Methods for controlling polyethylene rheology

The rheology of polyethylene resin may be controlled by measuring the specific energy input (SEI) to the extruder and then adjusting a process parameter in response to a change in the SEI and/or by introducing both a free radical initiator and an alkali earth metal stearate into the polymerization. Indeed, the process parameter changed in response to the SEI measurement may be adjusting the proportion of free radical initiator, adjusting the proportion of alkali earth metal stearate, or both. The free radical initiator may be a peroxide, and the alkali earth metal stearate may be calcium stearate.

Method for optimizing film properties of polyethylene blown film

Improving polyethylene film properties may be accomplished by measuring the specific energy input (SEI) to the extruder and then adjusting a process parameter in response to a change in the SEI and/or by introducing both a free radical initiator and an alkali earth metal stearate into the polymerization. Alternatively or in addition thereto, selecting the optimum free radical initiator for a particular polyethylene resin polymerized in the presence of a selected catalyst between two resin properties may be accomplished by examining the ratio of: % ⁢   ⁢ variation ⁢   ⁢ in ⁢   ⁢ a ⁢   ⁢ first ⁢   ⁢ property % ⁢   ⁢ variation ⁢   ⁢ in ⁢   ⁢ a ⁢   ⁢ second ⁢   ⁢ property of polyethylene resins individually made with each free radical initiator under consideration. The free radical initiator may be oxygen, peroxides, peroxyketals, peroxyesters, and/or dialkyl peroxides.

Screw machine with start valve and throttle

Automatic temperature control system for extruders for molten material

Automatic temperature control system for extruders having a plurality of heating zones which includes an electronic controller for controlling the electric heating power supplied to each zone, a temperature sensing device adapted to supply a signal to the controller representing the temperature of molten metal at the extruder head. The controller is in communication with all the heating zones and is adapted to control thyristortype active networks associated with the respective heating zones which regulate the electric heating power supplied to each zone in a pre-set adjusted ratio.

Method for forming a tube for use with a pump delivery system

In a method and system for forming tubing to achieve at least one predetermined performance characteristic relating to the flow of a flowable material therethrough, a relationship is determined between at least one material characteristic of the tubing material, at least one operating parameter of the tube forming machine, and the at least one predetermined performance characteristic of the tubing. Based on this relationship, at least one operating parameter for operation of the tube forming machine to achieve the at least one predetermined performance characteristic is determined. The at least one operating parameter is input into the tube forming machine and the machine is operated to achieve the at least one predetermined performance characteristic.

Process for the production of thermoplastic molding compounds

Method for continuous production of a thermoplastic moulding compound with a low scatter-range melt-flow index. Two or more identical-mixture starting products with varying melt-flow indices are mixed in a reclaim extruder which is equipped with an on-line melt-flow index measuring device and an adjustable metering system.

Process for producing a polyethylene-polypropylene multilayer blown film

The present invention relates to a process for producing a multilayer film comprising at least one polyethylene (except high pressure polyethylene) and polypropylene layer, wherein the adhesion between the polyethylene and polypropylene is enhanced without the use of any tie layer by processing the film with a freezing time of less than ten seconds.

Method and apparatus for monitoring polyolefin production

Method and apparatus for monitoring polyolefin production

The present technique provides for the use of spectroscopic probes, such as Raman probes, within the conduits of a polyolefin production system. The Raman probe or other spectroscopic probes can be used to obtain spectroscopic measurements of the contents of the conduits. The spectroscopic measurements can be processed and analyzed to determine the composition of the conduit contents. In addition, the spectroscopic measurements can be used in conjunction with correlations or other statistical models to determine one or more properties of interest of a constituent of the conduit contents. One or more processes upstream and/or downstream of the conduit can be adjusted in response to the determined composition or composition properties.

Process and apparatus for continuously producing an elastomeric composition

A process for continuously producing an elastomeric composition is described comprising the step of dosing into at least one extruder (5, 20) at least one ingredient by means of a dosing device (3, 8a, 8b, 10a, 10b, 14, 24), wherein the dosing step is regulated on the basis of : i) actual weight values of the at least one ingredient measured at dosing instants of an evaluation time period of predetermined duration preceding a given dosing instant; ii) expected weight values of the at least one ingredient calculated for corresponding dosing instants of the evaluation time period of predetermined duration preceding the dosing instant; and iii) expected weight values of the at least one ingredient calculated for a prediction time period of predetermined duration following the dosing instant; so as to minimize: - a prediction weight error between actual weight values measured during the prediction time period and the expected weight values calculated for the prediction time period, and - a model weight error between actual weight values measured during the prediction time period and theoretical weight values of the at least one ingredient corresponding to the target weight loss of the at least one ingredient.

Self-cleaning gravimetric and volumetric dosing apparatuses

A self-cleaning dosing apparatus includes a material hopper for containing pellets of material, a feed screw, a first material outlet through which pellets of material fall by gravity onto a first end of the feed screw for the feeding of pellets to a process machine. A second material outlet is located beneath the first end of the feed screw, with a slide gate blocking the second material outlet. A pneumatic piston is provided for pulling the slide gate to unblock the second material outlet, and a Venturi pump is located under the second material outlet for pulling pellets through the second material outlet when the slide gate is opened.

Continuous mixing of elastomeric compounds

An elastomer masterbatch or a compounded productive elastomer stock is made using a twin screw extruder to mix elastomer components in multiple mixing zones at controlled temperatures. Elastomer and other ingredients are fed into the twin screw extruder continuously through precise loss-in-weight or volumetric feeders. The degradation temperature and/or cross linking temperature of the elastomer determines the rate at which the elastomer can be processed, since friction created during mixing heats the elastomer. Accordingly, the maximum rate of compounding is a function of the torque limit, cooling efficiency, and conveying capacity of the extruder. The conveying capacity and torque limit are also a function of the size of the extruder. The viscosity of the elastomer compound in the extruder, as measured by a Mooney viscosimeter (ASTM D1646), is typically in the range of about 20 to 250 units (ML(1+4)100C).

Continuous process for producing rubber material containing silica filler and tyres incorporating this material

Continuous process for producing semi-finished rubber products, in particular tread bands, comprising the preparation of a blend formed of a base polymer and various ingredients, added in measured amounts and at defined points along a path for mixing and advancing the said blend, by alternating phases mainly involving mixing, with a high level of absorption of mechanical work, with phases mainly involving advance of the blend, with a reduced level of absorption of work, while controlling the heat profile of the said blend along the entire said mixing and advance path by determining the local values of a number of physical parameters, which are taken as characterizing the heat profile of the blend, at least at defined points on the said path. The process is carried out by means of a plant consisting of a twin-screw mixer (2) in which various components of the blend, including the polymer base, silica and silane, are introduced, of a cooling device (4) fed continuously by the twin-screw mixer (2), and of a single-screw extruder (5) fed continuously both by the said blend leaving the cooling device (4) and by the vulcanizing system.

Melt devolatilization extrusion process

Rheological measurement process

A method and apparatus for measuring the rheological properties of a polymer melt includes flowing the polymer melt from a first reactor to a device through a conduit at a predetermined flow rate, measuring a first pressure of the polymer melt at a first location in the conduit, measuring a second pressure at a second location downstream from the first location, measuring a temperature at a third location in the conduit, wherein the third location is between the first location and the second location, and calculating the Theological property of the polymer melt as it flows through the conduit. The method and apparatus do not require diversion of the polymer melt from the main process stream.

Patent DE3720325C2

熔体脱挥发分挤出方法

在脱挥发分挤出机中，将含有可聚合的碳-碳不饱和度和/或脂族结合卤素的热敏聚合物脱挥发分。所述热敏聚合物与第二聚合物掺合，所述第二聚合物不含可聚合的碳-碳不饱和度或超过5重量％脂族结合卤素，并且分子量为25,000至175,000。所述掺合物然后在挤出机中脱挥发分，以产生脱挥发分的聚合物掺合物。这种方法将所述热敏聚合物的热降解降到最低。

Patent SU410969A1

Apparatus for automatic control of extruder

Изобретение относитс  к химической промьппленности, а именно к автоматизации процессов переработки термопластов . Оно может быть использовано в производствах комбинированных упаковочных материалов и других про- и зводствах, использующих экструзию. Цель изобретени  - повышение качест- ва получаемых изделий за счет стабилизации расходных характеристик. Указанна  цель реализуетс  за счет наличи  датчика определени  показател  текучести расплава перерабатываемого полимера и вычислител . Устрой- ство предусматривает определение вычислителем отклонени  фактического показател  текучести от заданного и соответствующую корректировку заданий регул тором температуры зон цилиндра экструдера и формующей головки . Корректирующее воздействие получает и регул тор-датчик скорости вращени  привода шнека экструдера., Использование изобретени  обеспеч1ша- ет повьш1ение размерного качества изделий , получаемых методом экструзии, за счет инвариантности расходных характеристик зкструдера от колебаний в зкотекучих свойств перерабатываемого сырь . 1 ил. С/; с оо ОС См ее се The invention relates to chemical industry, in particular to the automation of processes for the processing of thermoplastics. It can be used in the production of combined packaging materials and other industrial and extrusion plants. The purpose of the invention is to improve the quality of the products obtained by stabilizing the consumption characteristics. This goal is realized due to the presence of a sensor for determining the melt flow index of the polymer being processed and the calculator. The device provides for the determination by the calculator of the deviation of the actual flow rate from the given one and the corresponding adjustment of the tasks by the temperature controller of the zones of the cylinder of the extruder and the forming head. Corrective action is also obtained by the regulator-sensor of the rotation speed of the screw drive of the extruder. The use of the invention ensures that the ...

用于生产弹性体化合物的挤压工艺和装置

本发明涉及一种用于生产弹性体化合物的挤压装置，所述装置包括内部限定腔室（3）的保持本体（2）和设置在所述腔室（3）中的至少一个挤压螺杆（4）。所述装置（1）还包括多个可换的挤压头，所述挤压头在所述腔室（3）的排出开口（2b）处交替地安装在所述保持本体（2）上。基于待处理的弹性体化合物的物化特性执行对使用头（5）而非另一类型或者将所述排出开口（2b）保留为自由的选择，以将所输出的化合物的温度和/或压力保持为低于这种化合物的临界阈值。

Extruder with a high capacity

본 발명은 종래에 개별적으로 사용되었던 핀-배럴 및 이송 혼합부가 한 압출기내에 함께 사용되는 고성능 압출기에 관한 것이다. 두 혼합 시스템의 조합은 물질 처리량이 60%내지 100%까지 증가하며, 일정한 혼합 상태가 유지되며 구동 토오크가 절감된다. The present invention relates to a high performance extruder in which the pin-barrel and conveying mixing portions used separately in the prior art are used together in one extruder. The combination of the two mixing systems increases material throughput from 60% to 100%, maintains constant mixing and reduces drive torque.

Shape-memory laminated polybutylene terephthalate film, production process and use thereof, and process for production of polybutylene terephthalate film

본 발명은, (1) 폴리부틸렌 테레프탈레이트 필름과 다른 필름 또는 필름 적층체를 접착하여 얻어진 적층 필름을, 제1 형상으로 유지시키면서, 상기 폴리부틸렌 테레프탈레이트의 유리 전이 온도 이하의 온도(T 1 )에서 부형 처리하고, (2) 얻어진 부형 적층 필름을, 상기 유리 전이 온도보다 높은 온도(T 2 )에서 제2 형상으로 변형 가공한 다음, (3) 상기 유리 전이 온도 이하의 온도(T 3 )으로 냉각시킴으로써 얻어지는, 우수한 형상 기억성과 내열 치수 안정성을 갖는 폴리부틸렌 테레프탈레이트 적층 필름에 관한 것이다. The present invention provides a temperature (T) below the glass transition temperature of the polybutylene terephthalate while (1) maintaining the laminated film obtained by adhering the polybutylene terephthalate film and another film or film laminate in a first shape. 1 ) the shaping treatment in (2), (2) the resulting laminated laminate film is deformed into a second shape at a temperature (T 2 ) higher than the glass transition temperature, and (3) a temperature below the glass transition temperature (T 3 The present invention relates to a polybutylene terephthalate laminated film having excellent shape memory and heat resistance dimensional stability obtained by cooling with). 폴리부틸렌 테레프탈레이트 필름, 적층, 유리 전이 온도, 형상 기억, 내열 치수 안정성 Polybutylene Terephthalate Film, Lamination, Glass Transition Temperature, Shape Memory, Heat Resistance Dimensional Stability

Method and apparatus for monitoring polyolefin production

The present technique provides for the use of spectroscopic probes, such as Raman probes, within the conduits of a polyolefin production system. The Raman probe or other spectroscopic probes can be used to obtain spectroscopic measurements of the contents of the conduits. The spectroscopic measurements can be processed and analyzed to determine the composition of the conduit contents. In addition, the spectroscopic measurements can be used in conjunction with correlations or other statistical models to determine one or more properties of interest of a constituent of the conduit contents. One or more processes upstream and/or downstream of the conduit can be adjusted in response to the determined composition or composition properties.

On-line rheometer device

A system for providing process control information, such as viscosity, concerning a polymer melt comprises a means containing a polymer melt under pressure; means for diverting a stream of the polymer melt directly from said containing means to and through an orifice of predetermined geometrical shape wherein the flow of said diverted portion to and through said orifice is unobstructed and directly dependent on the pressure of said main polymer melt wherein the cross sectional area is sized to permit the flow of said diverted melt polymer therethrough absence additional independent means acting on said diverted melt polymer for increasing flow through said orifice; temperature sensing means for measuring the temperature of the diverted melt stream and producing a resultant temperature signal; pressure sensing means for measuring the pressure of the diverted melt stream and producing a resultant pressure signal, said pressure signal being directly dependent on the pressure of polymer in said main polymer melt and the predetermined size of said orifice; means weighing at least a portion of said diverted melt stream discharged through said orifice, said weighing means including weight sensing means for measuring the weight of diverted melt stream and producing a resultant weight signal; and computer means responsive to the temperature, pressure and weight signals for determining process characteristics of the main polymer melt.

一种导电复合材料及其制备方法

本发明提供一种利用碳纳米管和石墨烯填料之间的协同作用制备的导电复合材料及其制备方法。本发明的导电复合材料，由包括以下重量份的组分制成：聚合物92~99份；碳纳米管0.9~6份；石墨烯0.1~2份。与传统的导电复合材料相比，本发明的导电复合材料通过利用碳纳米管和石墨烯填料间的协同作用，可以对复合体系实现：第一，导电填料之间相互连接，提高导电填料之间的连接效率，从而提高复合材料的导电率；第二，导电填料之间起到协同分散的目的，降低导电填料的使用量；第三，降低碳纳米管和石墨烯的使用量，节约材料的制备成本，同时不损失复合材料的力学性能，且制备的操作步骤简单、不需要耗费大量溶剂，并适用于大规模的工业生产。

Method for controlling melt rheology of resin mixtures

A process including: introducing and continuously melt mixing in an extruder a mixture of a first resin feed and a second resin feed; measuring within the extruder the melt rheology of the resulting melt mixture of the first and second resins; determining the relative ratio of the first resin and a second resin from the melt rheology in the resulting melt mixture; and adjusting the relative feed ratio of the first resin and second resin feeds introduced to the extruder.

Method and apparatus for rheometry, and its application to control of polymer manufacture

A method and apparatus for studying the properties of a fluid are provided in which in which a rheometer is used to obtain, for example, value(s) indicative of the shear stress in the fluid to thereby obtain a set of data. The data is then directly compared using, for example, multivariate analysis, with previously obtained data corresponding to a fluid(s) with known rheological properties. The results of this comparison can then be used, for example, to control a manufacturing process.

聚碳酸酯树脂薄膜及其制造方法

本发明涉及一种聚碳酸酯树脂薄膜，其平均厚度为10～150μm，厚度不均率在2％以内，在波长589nm下测定的薄膜面内相位差R(589)为12nm以下，在波长589nm下测定的薄膜厚度方向的相位差Rth(589)为35nm以下，且用于光学用途中。

用于制造热塑性产品和组合物的系统和方法

可用于道路标记的热塑性组合物可使用可降低成本并提高产品质量的连续系统和过程方法生产。系统可以包含有包含多个进料器的进料系统(100)和包含混合器(440)和平整系统(401)的混合系统(400)。每个进料器可以配置为以根据选择的产品配方的进料速率排出材料(101)。混合系统(400)可以配置为接收、加热和合并材料(101)以产生热塑性材料，并且以确定的排出速率排出热塑性材料。

Extruder for deaeration

A method for regulating the working and the output of plastic material in extrusion moulding

Method for controlling the processing and output feeding of plastic melt by extrusion, by means of an extrusion plant comprising a process unit (1) for processing the plastic material, a pump (3) for feeding the plastic melt to a die (4) or similar, and a screen pack assembly positioned between the process unit (1) and the pump (3). In the process unit (1) the melt is imparted a constant level of kinetics of extrusion, and the plastic melt pressure (P2) between the screen pack assembly (2) and the pump (3) is kept above a predetermined level. As a measure of the level of kinetics of extrusion, the pressure (P1) of the melt between the process unit (1) and the screen pack assembly (2), is used, preferably in combination with the melt pressure (P2) after the screen pack assembly (2).

Process for manufacturing an adhesive by means of extrusion

The present invention relates to a process for manufacturing an adhesive by extrusion, wherein the adhesive comprises at least one degraded polypropylene (co)polymer and at least one additional additive.

用于在挤出设备中执行物料转换的方法

本发明涉及一种在挤出设备(10)中执行物料转换的方法，该挤出设备具有至少两个用于给挤出机(30)供给装料(E)的供料装置(20)，具有以下步骤：识别用于在挤出设备(10)中的物料转换的转换要求；针对在至少一个供料装置(20)的物料转换后的时刻预先确定生产稳定性；将预先确定的生产稳定性与稳定性限值相比较；根据比较结果针对至少一个供料装置(20)执行该物料转换。

一种微米碳酸钙增韧增强的加纤阻燃聚乙烯粉末

本发明公开了一种微米碳酸钙增韧增强的加纤阻燃聚乙烯粉末，其组分按质量百分数配比为：聚乙烯50％～70％、玻璃纤维10％～20％、复配型阻燃剂6％～20％、微米碳酸钙5％～15％、表面处理剂0.1％～0.3％、抗氧剂0.1％～1％、润滑剂0.2％～1.5％、其他添加剂0～1％。本发明的有益效果是，与现有技术相比，本发明制得的聚乙烯粉末在保持较好的原有性能的同时，大幅度地提高了材料的冲击韧性、刚度和耐热性，而且无卤阻燃效果好，达到UL94V-0阻燃级，可广泛应用于建筑、交通运输、电线电缆、化工机械等行业。

Viscosity pump for extrusion-based deposition systems

A pump system comprising a delivery assembly configured to feed a solid material under operational power of a first drive motor, and a screw pump comprising a housing that at least partially defines a barrel of the screw pump, an extrusion tip secured to the housing at a first end of the barrel, a liquefier secured to the housing and intersecting with the barrel, and an impeller extending at least partially through the barrel. The liquefier is configured to receive the solid material fed from the delivery assembly, to at least partially melt the received solid material, and to direct the at least partially melted material to the barrel, and the impeller is configured to drive the at least partially melted material that is directed to the barrel toward the extrusion tip under operational power of a second drive motor.

Extruder for processing and production of rubber and thermoplastic materials

FIELD: processing of rubber and thermoplastic materials. SUBSTANCE: extruder comprises an entry zone, a pin zone for mixing and homogenization, and an additional delivery and mixing zone. The pin zone accommodates pins radially arranged in a casing. In said zone the crests of auger thread are interrupted. Preferable number of pin rows is up to 5. The auger in the additional zone has the depth of thread roots uniformly diminishing to zero with subsequent increase to a maximum. In the same zone the threads on the internal surface of the casing have the height of ridges uniformly increasing to a maximum and decreasing to zero. There may be a high pressure zone at the extruder outlet. The extruder zones have concrete specified lengths which depend on the auger diameter. EFFECT: extruder throughput is increased by 60-100% at a good quality of mixture. 5 cl, 1 dwg с 9б0Сс ПЧ Го РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (19) (51) МПК ВИ "” 2 053 121 ' 13) Сл В 29 С 47/38 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 5010279/26, 13.12.1991 (30) Приоритет: 14.12.1990 ОЕ Р 4039942.7 (46) Дата публикации: 27.01.1996 (56) Ссылки: 1. Патент ФРГ М 1142839, кл. 12е 4/50, 1963. 2. Патент США М 4178104, кл. В 2ЭВ 1/06, 1979. (71) Заявитель: Херманн Бершторфф Машиненбау ГмбХ (0Е) (72) Изобретатель: Герд Капелле[ОЕ], Гюнтер Майер[ОЕ] (73) Патентообладатель: Херманн Бершторфф Машиненбау ГмбХ (0Е) (54) ЭКСТРУДЕР ДЛЯ ОБРАБОТКИ И ПРОИЗВОДСТВА КАУЧУКА И ТЕРМОПЛАСТИЧНЫХ ПЛАСТМАСС (57) Реферат: Использование: переработка каучука и термопластичных пластмасс. Сущность изобретения: экструдер имеет вводную зону, штифтовую зону смешивания и гомогенизации и дополнительную зону подачи и смешивания. В штифтовой зоне размещены радиально в корпусе штифты. В зоне штифтов гребни нарезки шнека имеют разрывы. Предпочтительно наличие до пяти рядов штифтов. В дополнительной зоне шнек выполнен с равномерным уменьшением глубины пазов нарезки до нулевого значения и ...

Manufacture of conductive plastics

Zur Herstellung von leitfähigen Kunststoffen werden die Dosierungsverhältnisse bisher gravimetrisch oder volumetrisch festgelegt. Nach der Erfindung regelt man in Abhängigkeit eines am Ertrudat gemessenen elektrischen Wertes die Dosierungsverhältnisse. The dosage ratios for the production of conductive plastics have so far been determined gravimetrically or volumetrically. According to the invention, the dosage ratios are regulated as a function of an electrical value measured on the erudate.

Manufacture of conductive plastics

Zur Herstellung von leitfähigen Kunststoffen werden die Dosierungsverhältnisse bisher gravimetrisch oder volume­ trisch festgelegt. Nach der Erfindung regelt man in Abhän­ gigkeit eines am Ertrudat gemessenen elektrischen Wertes die Dosierungsverhältnisse. For the production of conductive plastics, the Dosage ratios previously gravimetric or volume determined trically. According to the invention, one regulates in depend of an electrical value measured on the erudate the dosage ratios.

System and method for blending polymers

The present techniques provide an extruder screw comprising a high shear melting and mixing zone starting a distance away from an entry point of the screw corresponding to 35%-50% of the overall screw L/D. The extruder screw may also include elements capable of increasing a degree of fill of the high shear melting and mixing zone. In accordance with present techniques, the extruder screw is configured to blend two or more polyolefin polymers having greater than about a 200,000 difference in weight-average molecular weight in a single extrusion step. The extruder screw of the present techniques may be used in a single screw or twin screw extruder, and may be incorporated into a polyolefin production plant for producing multi-modal resins.

Process for Producing Biopolymer Nanoparticle Biolatex Compositions Having Enhanced Performance and Compositions Based Thereon

The present invention provides novel biolatex conjugate compositions and methods of production and use thereof. The novel biolatex conjugate compositions comprise a biopolymer-additive complex (prepared by co-extruding a biopolymer feedstock, at least one performance-enhancing additive, and at least one plasticizer under shear forces) reacted with a crosslinking agent under shear forces. The biolatex conjugate compositions exhibit enhanced performance properties for coated paper, paperboard, and other applications using extremely low levels of performance-enhancing additives.

Production of shaped, high polymeric articles

There is disclosed a method of and apparatus for use in the production of shaped, high polymeric articles, particularly yarns, in which natural, thermo-plastic high polymeric material and a coloring agent are mixed together and the delivery of the coloring agent for mixing is controlled in dependence upon the rate at which the mixture is processed.

Microcellular foam extrusion/blow molding process and article made thereby

A microcellular injection blow molding system and method, and microcellular blow molded articles produced thereby, are described. The system is equipped to extrude microcellular material that changes in thickness, material density, or both in the machine direction while maintaining a constant pressure drop rate during nucleation just prior to extrusion, providing the ability to produce consistent uniform microcellular material independent of material thickness. The systems and methods are particularly useful in production of strong, thin-walled, non-liquid-permeable, opaque containers that do not contain reinforcing agent, chromophore, or residue of chemical blowing agent or chemical blowing agent by-product. Semi-crystalline microcellular foams that include a midlevel amount of nucleating agent, and methods of their production, also are provided. The microcellular foams can be produced in typical polymer processing techniques such as extrusion, injection molding and blow molding. The foams exhibit excellent mechanical properties and can be formed over a broad range of density into a number of different foam articles. Also provided are high-density polyethylene foams and dies that are suited for use with HDPE, foams.

Process to regulate the degree of molecular network formation in polyurethane pipe with an in-line measuring system

In an extrusion process to manufacture polyethylene plastic pipes for e.g. sub-floor heating systems, hot water pipes, drinking water pipes etc, the plastic molecules have a molecular network created by peroxide. The extrusion assembly has a peroxide dosing station, a UV or IR radiation emitter, an in-line measuring system (7) that determines the degree of network formation, and a pipe discharge station. The radiation emitter (6) and/or peroxide dosing station and/or the pipe (5) discharge speed are regulated in response to the values registered by the measuring station.

Gear pump control method and gear pump control device

Method of and apparatus for controlling the viscosity of molten plastics material which is to be moulded

A plastics extruder in operative association with a control arrangement is disclosed. The plastics extruder includes a screw extruder, a screen downstream of the screw extruder, a throttle located between the screw extruder and the screen, a moulding tool downstream of the screen, and a melt index measuring device. The measuring device includes a metering pump whose rotational speed is controllable and which is provided with a rotational speed indicator, a measuring nozzle disposed in a sample flow channel, and pressure and temperature sensors connected to the sample flow channel directly upstream of the inlet of the measuring nozzle. The sample flow channel is adapted to be located downstream of the screen pack and upstream of the moulding tool. For the purpose of regulating the viscosity of the plastics material melted in the screw extruder, the throttle cross-section is variable by a servomotor connected to the output of a programmable two-coordinate controller. The characteristic of the controller provides a desired value output and can be predetermined as a temperature-pressure characteristic when the metering pump is operated with constant delivery, or as a temperature-delivery characteristic when the metering pump is operated with a constant pressure drop via the measuring nozzle while the temperature sensor is connected to one of two actual value inputs of the two coordinate controller. Either the pressure sensor or the rotational speed indicator is connected to the second actual value input.

Method of extruding and shaping thermoplastic material

A method of extruding and shaping thermoplastic material in which a constant amount of thermoplastic material is continuously fed from a screw extruder to a die by means of a metering pump. The extruder is arranged to continuously receive a constant amount of the thermoplastic material. The metering pump is adjusted to the correct rotational frequency to maintain the pressure of the molten thermoplastic material between the extruder and the metering pump within a predetermined range.

Extruder viscosity control system and method

An extruder control system and method controls melt temperature to maintain viscosity of the melt at the die. A constant volumetric flow to the die is delivered by a gear pump, the die is a fixed orifice, and pressure between the gear pump and the die is indicative of viscosity. Changes in pressure are sensed and compensating changes in temperature are effected to return the pressure and, hence, the viscosity to its previous value.

Method and extrusion apparatus for degassing thermoplastic plastics material melts

A method of degassing thermoplastic plastic melts over a wide range of viscosities in a degassing extruder including a plurality of sequential degassing sections. Each degassing section includes at least one screw section having flights formed thereon. Each section includes a degassing region and a metering section downstream thereof. The height and length with which the flights are filled in the degassing regions in the individual degassing sections is controlled by the comparison of a pressure gradient measured in the metering region of that section with a desired pressure gradient and on the basis of this, the melt is conveyed with substantially the same throughput capacity in each degassing section. As a result of these measures, the degassing is effected in all of the degassing sections with optimally partially filled screw threads and with an optimum filling length of the worm threads, which is independent of the viscosity of the melt. The number of flights, the depth and width of the flights and the pitch of the flights may be identical in all degassing sections thus simplifying the manufacture of the screw.

Method for regulating the working and the output of plastic material in extrusion moulding

Method for controlling the processing and output feeding of plastic melt by extrusion, by means of an extrusion plant including a process unit (1) for processing the plastic material, a pump (3) for feeding the plastic melt to a die (4) or the like, and a screen pack assembly positioned between the process unit (1) and the pump (3). In the process unit (1) the melt is imparted a constant level of kinetics of extrusion, and the plastic melt pressure (P2) between the screen pack assembly (2) and the pump (3) is kept above a predetermined level. As a measure of the level of kinetics of extrusion, the pressure (P1) of the melt between the process unit (1) and the screen pack assembly (2), is used, preferably in combination with the melt pressure (P2) after the screen pack assembly (2).

System and method for controlling continuous mixer with melt pump

An improved system and method for effectively controlling the operation of a continuous mixer/melter having an adjustable exit opening and connected to a melt pump is provided. The melt pump, which is preferably a gear pump, is operatively connected to an extruder/pelletizer. Operation of the gear pump is controlled in proportional relation to the energy requirements of the mixer/melter motor, the energy applied to adjust and maintain the exit opening of the mixer/melter, and the suction pressure measured at the interface between the mixer/melter and the gear pump. A microprocessor unit which receives and processes the input signals, calculates the energy requirements of the gear pump motor and compares these requirements with the actual torque, makes the necessary adjustments to the gear pump.

On-line rheological measurements for process control

On-line rheological measurements are made utilizing a rheometer of the type in which a first metering pump delivers diverted melt from a process main stream to a capillary passage and a second metering pump returns the diverted melt from the capillary passage to the process main stream and the viscosity of the diverted melt is measured by controlling the rate of flow of the melt through the capillary passage to maintain constant the pressure drop between spaced apart locations along the capillary passage and measuring the temperature of the melt in the capillary passage. The measurements may be made while controlling the speed of the second metering pump independent of the speed of the first metering pump to maintain the pressure at the exit of the capillary passage essentially constant. A parallel flow passage has an inlet placed between the first metering pump and the entrance to the capillary passage, in close juxtaposition with the entrance and an outlet placed between the exit from the capillary passage and the second metering pump, and a valve in the parallel flow passage is operated so that diverted melt selectively is passed through the parallel flow passage to attain a relatively quick response and relatively short residence time of the diverted melt in the rheometer.

Method for extruding tire rubber material

Tire rubber material is highly accurately and efficiently extruded by a positive displacement extruding system that includes, as seen from an upstream side of the tire rubber, a screw extruder unit, a gear pump unit and an extrusion head unit with an extrusion nozzle, which are connected in series with each other. While the tire rubber is caused to flow through the extruding system, the temperature of the rubber material is measured and controlled to be within a predetermined temperature range, in accordance with the measured temperature of the rubber material. The rubber material maintained at a controlled temperature is extruded from the extrusion nozzle, thereby improving the positive displacement performance of the extruding system.

Plastics extruder dimension and viscosity control system and method

An extrusion control system and method controls the cross section and viscosity in the process of extruding even hard to control plastics like polyurethane. Cross section, A, is determined by measuring volumetric rate of delivery of melt through a gear pump V/t and the speed of the extrudate at a puller N/t. The cross-sectional area, A = V / t N / t , is controlled by controlling the puller speed. Pressure drop across the die, P, and the volume of melt delivered by the gear pump are measured and a term indicative of the viscosity of the melt is determined based on Vs = KP V , Vs being the viscosity and K being a constant dependent on the size and shape of the die orifice. Viscosity variations are compensated by varying heat applied to the melt.

Method for producing profiles made of thermoplastic material

The invention relates to a method and the thus required devices for automated process and quality monitoring of an extrusion plant and an integrated closed-loop process control system for timely correction of process parameters as a result of fluctuations in the properties of the raw material or parameter fluctuations of the extrusion system in order to ensure an even quality of the produced profile.

Extrusion molding system and method

An extrusion molding system includes a die having a first opening with a unvariable shape and a second opening with a variable shape, an extruder which feeds resin to the die, and a gear pump arranged between the die and the extruder. An ECU conducts a first sequence control to change the shape of the second opening and a second sequence control to change the rotation speed of the first gear pump in synchronism with a change in the shape of the second opening.

Mixing Machine For Components

An extrusion conveying apparatus, including an extruder that operates as a mixing device and is laterally supplied with components that are to be mixed, in particular components of a rubber mixture or thermoplastic elastomer. A volumetrically operating conveyor, in particular a gear pump, is connected to the output side of the extruder. A rotational speed or feed rate of the extruder is adjustable independently of the feed rate and volume flow of the conveyor. n−1 volumetric subsidiary conveyors are provided for passage of components therethrough where there are n components of a mixture. In particular component n is supplied in an undosed manner. A rotational speed or feed rate of the subsidiary conveyors is adjustable independently of the feed rate of the volumetrically operating conveyor.

Method for feeding the starting materials into a screw press for producing a film web

Process of producing thermoplastic resin sheet and equipment therefor

METHOD FOR OPERATING A SNAIL EXTRUDER AND SNAIL EXTRUDER FOR IMPLEMENTING THE METHOD

Process for product monitoring of melt-extruded plastics by monitoring the dynamic viscosity of the melt in the extrusion system

A process and a device for product monitoring of melt-extruded plastics, in particular chemical fibres, is proposed, in which the dynamic viscosity of the melt at the end of the melting extruder is monitored. In a measurement zone of the melt stream leading to a consumer, the pressure loss and the temperature are measured for this purpose and input into a computer. Since with constant delivery of the melt from the measurement zone by means of a volumetrically operating metering pump, the pressure loss is directly proportional to the viscosity, a good opportunity is provided for monitoring the effects of the extruder operation on the product quality and, by corresponding interventions, of controlling the melting process with the object of providing the desired quality.

Anlage zum überwachen der abmessungen eines aus einer oder mehreren mischungen bestehenden kontinuierlich extrudierten profilbandes aus kautschuk oder thermoplastischem kunststoff

Verfahren und einrichtung zur anpassung eines extrusionswerkzeuges an einen extruder

Automatic regulation of extruders - using signal transmitters

An extruder system has feed and injection extruders, each with independent drive and back-pressure device. The turning moment and/or back pressure of the injector section is controlled by signals from moment and/or pressure transmitted to a regulator, in which the signals are compared with reference values, so that differences produce further signals to speed regulators via a tachometer/generator.

Method and ultrasonic apparatus for polymer extrusion

A method of extruding a unit of recycled polymer feedstock material comprising the steps of: providing the recycled polymer feedstock material; passing the feedstock material through an extrusion system (2b); applying ultrasonic energy (16) to the feedstock material passing through the extrusion system (2b); measuring one or more properties of the feedstock material and/or one or more processing conditions during the extrusion process; real time analysing the measurements of the one or more properties of the feedstock material and/or the one or more processing conditions during the extrusion process; and real time reviewing the application of ultrasonic energy (16) to control the one or more properties of the feedstock material based on the analysis of the feedstock properties or processing conditions during the extrusion process.

Process of producing thermoplastic resin sheet and equipment therefor

This invention relates to a process of producing a thermoplastic resin sheet and equipment therefore. The equipment includes a first extruder of a high kneading type, a second extruder of a low kneading type and an extrusion die. A film-shaped resin extruded from the extrusion die is cooled by a cooling device, to thereby obtain the resin sheet. Additionally, a difference between pressures at the outlets of the first and second extruders is detected, and, in response to this difference between the pressures thus detected, the operating conditions of the first extruder are automatically controlled.