Abstract: An evaporator device incudes a crucible comprising an inlet through which solid material is introduced to the crucible, and an outlet through which vaporised material is released from the crucible. Vapours outgassed from molten material within the crucible are guided away from the outlet.

Abstract: The present disclosure relates to a facility for forming one of a graphene-polymer resin composite and a carbon material-polymer resin composite. According to the facility of the present disclosure, in a process of forming the composite, gas and water vapor contained in graphene, a carbon material, and a polymer resin are effectively removed resulting in an increase in coupling force between the polymer resin and one of the graphene and the carbon material, and the graphene and the carbon material is uniformly dispersed inside the polymer resin resulting in no degradation of physical properties of the composite, and also, the polymer resin may be prevented from carbonizing and solidifying because there is no stagnant section while molten liquid of the polymer resin and one of the graphene and the carbon material passes through each apparatus in the facility, and thus, physical properties of the composite are maintained constant.

Abstract: A screw for a plasticating apparatus has one or more helical flights. A portion of the screw has a plurality of advancing grooves arranged in a noncontinuous helix cut in the screw. The advancing grooves are dimensioned to receive material therein as the material is conveyed through the barrel. The screw has a plurality of noncontinuous cross-cut grooves traversing one or more of the advancing grooves. The cross-cut grooves have a second helix angle greater than the first helix angle and less than ninety degrees; and/or one or more of the cross-cut grooves have a third helix angle of about ninety degrees.

Abstract: When a food processing vessel under vacuum is repressurized, the tendency of product in the vessel to be forced into feed lines is relieved or overcome by establishing an effectively high pressure in the feed lines.

Abstract: A screw for a plasticating apparatus has one or more helical flights. A portion of the screw has a plurality of advancing grooves arranged in a noncontinuous helix cut in the screw. The advancing grooves are dimensioned to receive material therein as the material is conveyed through the barrel. The screw has a plurality of noncontinuous cross-cut grooves traversing one or more of the advancing grooves. The cross-cut grooves have a second helix angle greater than the first helix angle and less than ninety degrees; and/or one or more of the cross-cut grooves have a third helix angle of about ninety degrees.

Abstract: An extruder 10 comprises a barrel 12 and a screw 24 mounted in the barrel for rotation. The screw comprises screw threads 26a, 26b, 26c. The barrel has an inlet funnel 22 toward one end for material to be extruded and a die plate 18 with openings 20 at the other end and an air inlet port 28 toward one end of the barrel and an air outlet port 30 toward the other end. The screw threads are such that material 34 in the barrel is moved more quickly along the portion of the barrel between the air inlet port and the air outlet port than upstream of that portion. The air outlet is connected to a pump 32 so that there is a pressure difference between the air inlet and the air outlet.

Abstract: A thermal imaging camera monitors the temperature different zones in a pharmaceutical process such as ribbon compaction, coating, spray drying, fluid bed drying, high shear wet granulation, crystallization, lyophilization, precipitation, fermentation, and low dosage dispensing of a pharmaceutically active liquid. The thermal imaging camera can be used to produce a visual display of a temperature profile, or a spray pattern. In addition, feedback from the thermal imaging camera is used to control one or more processing parameters.

Abstract: An extruder for feeding material and for removing gas from the fed material. The extruder includes a vent block positioned between a first and second auger. The vent block including a vent cavity having a feed end and an exit end, an inner feed ring that partially extends into said vent cavity at the feed end of the vent cavity, and a screw element rotatably positioned in the vent cavity. A front portion of the outer ring is longitudinally aligned with or overlapping the front end of the inner feed ring. The outer ring forms at least one gap or opening at or adjacent the feed end of the vent cavity to enable a vacuum to be pulled on the vent cavity as material is moved though the vent cavity from the feed end to the exit end by the screw element.

Abstract: A machine and method of extruding concrete building product, e.g., brick, tile, paver, or shingles, and concrete mixture therefor. The mixture has aggregate, liquid and binder that includes fly ash and can include slag with moisture content controlled producing a zero or negative slump loose feed mixture compacted in a consolidation chamber of the machine into increased density consolidated mixture extruded from an extrusion chamber in communication with the consolidation chamber with compaction force being generally transverse to extrusion force. Compaction force is maintained during extrusion through a die of non-tapering construction. Where the extruded product is a brick, the extruded slug is cut into a plurality of bricks using a rotary cutter having an offset forming an increased moisture absorbing region in the cut surface of each brick formed from the slug that better bonds with mortar during bricklaying.

Abstract: An extruder for feeding material and for removing gas from the fed material. The extruder includes a vent block positioned between a first and second auger. The vent block including a vent cavity having a feed end and an exit end, an inner feed ring that partially extends into said vent cavity at the feed end of the vent cavity, and a screw element rotatably positioned in the vent cavity. A front portion of the outer ring is longitudinally aligned with or overlapping the front end of the inner feed ring. The outer ring forms at least one gap or opening at or adjacent the feed end of the vent cavity to enable a vacuum to be pulled on the vent cavity as material is moved though the vent cavity from the feed end to the exit end by the screw element.

Abstract: Disclosed is an apparatus for processing of plastics, with a container with a mixing implement, and a conveyor provided with a screw rotating in a housing, the housing being divided into two chambers, the frontal chamber having an intake aperture, and the rearward chamber having at least one degassing aperture, the two chambers being connected to one another through a channel having a melt filter, wherein the imaginary continuation of the longitudinal axis of the conveyor in a direction opposite to the direction of conveying passes the axis of rotation, wherein the distance from the opening of the channel into the rearward chamber to the degassing aperture is in a range from 1.5 to 15 times the nominal diameter (d) of the screw.

Abstract: An improved desolventizer toaster and methods are provided wherein a solvent vapor recycle system may be employed to recycle solvent vapor throughout a portion of the desolventizer portion of the apparatus housing. In other embodiments of the invention, a water vapor recycle system may be employed to recycle water vapor throughout a portion of the toaster portion of the apparatus housing. The solvent vapor recycle system may comprise an appropriate meal dust separator, blower and superheater. The water vapor recycle system may comprise an appropriate ejector or blower and superheater. Water vapor recovered in the solvent extraction process may be used as a water vapor feed to the heated water vapor recycling system.

Abstract: The present invention relates to a method and to a device for extracting air in an injection molding device. The device comprises an extraction hood having a housing, in which one or more extraction ducts are provided, wherein the extraction hood can be disposed in the region of the injection nozzle of an injection unit, the housing at least partially encloses the injection nozzle of the injection unit, and air can be extracted from the region of the injection nozzle via openings (38) or ducts (34), and a ventilation device connected to the housing of the extraction hood (16) for flowing. According to the invention, the extraction hood and/or the ventilation device can be adjusted for implementing different extraction intensities in at least two operating modes.

Abstract: The invention relates to a device (1) for extruding thermoplastic material, having an extruder housing (22) in which an extruder screw (22) driven by a drive device (23) is supported rotatably about the axis thereof, said housing comprising an intake opening (24) to which a plastic material feeder (3) is connected, said feeder comprising at least one air inlet opening (36), wherein the extruder housing (22) comprises at least one vapor outlet opening (41) upstream of the intake opening (24) and an air/vapor path (28) is defined from the intake opening (24) to the vapor outlet opening (41).

Abstract: The invention relates to a method and furnace allowing the use of filter earth (diatomaceous earth) waste, in which the organic material is removed using the method of the application. The furnace comprises a container in which the industrial waste is deposited, and a folding table is used to transport the material. The invention also includes an agitator with a base, used to lower blades and remove the treated material. The gases generated are collected by an extractor which includes a cooling jacket and are subsequently sent to an absorber system in which they are neutralised. Said device and method are used to obtain lightweight materials with low porosity and high compression strength, rendering solid granular industrial waste that is dangerous to the environment suitable for use in the construction or mechanical industries.

Abstract: The invention relates to a vented extruder (1) for the devolatilization of a polymer material, encompassing at least one extruder barrel (2) with at least one rotatably driven extruder screw (3) mounted in the extruder barrel (2), and with at least one material feed and with at least one extrudate outlet, and also with at least one vent zone (9). A particular feature of the vented extruder (1) is that the gas output for the gas arising in the vent zone (9) has been provided upstream of the material feed, in relation to the direction of conveying of the polymer material.

Abstract: The invention relates to a vented extruder (1) for the devolatilization of a polymer material. The vented extruder (1) encompasses at least one drive (4), at least one gearbox (5), at least one rotatably driven extruder screw (3), at least one first material feed (6) and at least one extrudate outlet (13). A feature of the vented extruder (1) according to the invention is that the drive, encompassing drive (4) and gearbox (5), has been provided in the region of that end of the extruder screw (3) that is downstream in relation to the direction of conveying of the polymer.

Abstract: A batch mixer is equipped with a plunger for pushing material from the batch mixer. The batch mixer includes a mixer tank structured to accommodate material. The mixer further includes a mixer head comprising at least one blade structured to blend the material within the mixer tank. The mixer further includes a plunger mechanism structured to push the blended material directly from the mixer tank.

Abstract: A screw machine for treating at least partially powdery bulk material has a housing with at least one housing bore and a screw arranged in the housing bore. A vacuum housing portion is provided, which is formed as a vacuum housing insert, which is releasably attached in the housing, in which a metal nonwoven is exchangeably held as a gas-permeable wall portion on a base body.

Abstract: An extruder for feeding material and for removing gas from the fed material. The extruder includes a vent block positioned between a first and second auger. The vent block including a vent cavity having a feed end and an exit end, an inner feed ring that partially extends into said vent cavity at the feed end of the vent cavity, and a screw element rotatably positioned in the vent cavity. A front portion of the outer ring is longitudinally aligned with or overlapping the front end of the inner feed ring. The outer ring forms at least one gap or opening at or adjacent the feed end of the vent cavity to enable gas to flow out of the vent cavity as material is moved though the vent cavity from the feed end to the exit end by the screw element.

Abstract: The invention provides a continuous process for removing organic solvents from a marc including the steps of: continuously introducing the marc into a desolventiser; introducing an inert, gaseous stripping medium into the desolventiser; removing the organic solvents from the marc by maintaining a sub-atmospheric pressure inside the desolventiser, thus providing an organic solvent-desolventised material; and continuously extracting the organic solvent-desolventised material from the desolventiser; wherein step (a) and (d) comprise compacting the marc and the organic solvent-desolventised material into a first and second plastic, substantially gas-impermeable mass respectively and extruding the first and second plastic mass through an annular gap, the opening of which is controlled by the rate of supply of the first and second plastic mass. The invention also provides a device for compacting a moist organic material into a first plastic gas-impermeable mass which is useful for implementing this process.

Abstract: A crushing and mixing device includes a mixing vessel in which a plurality of blades installed on a rotary shaft which is rotated by a motor as a driving source and freely rotatably supported, to mix and crush materials. A spiral vane is equipped to supply the materials which are introduced to a rotary shaft corresponding to an inlet from materials, to the mixing vessel; at least two blades are installed on the rotary shaft at an inclined angle; an outlet disposed at a side of a wall of the mixing vessel; the materials are mixed and crushed in the mixing vessel, and an entrained moisture therein is dewatered by the heat generated by actions of shearing, friction and compression; and a molten binder is impregnated in the dehydrated materials.

Abstract: The invention relates to a device for the extrusion of thermoplastic synthetic material featuring an extruder screw (2) which is mounted on a housing (1) including a plasticizing section (P) at the inlet side, a degassing section which is mounted upstream on a discharge section (A) and a conveying outlet (3) operating in the opposite direction which is located between the plasticizing section (P) and the degassing section (E). A flow channel (5) that contains a melt filter (4) is bridged over by at least one of the conveying outlets (3) in the opposite direction. To create favorable production conditions, the extruder screw (2) forms a similar conveying outlet (7) operating in the same direction between the conveying outlet (3) in the opposite direction and the downstream port (6) of the flow channel (5). The housing (1) has at least one degassing vent (8) at the transition area of the conveying outlet (3) operating in the opposite direction and the conveying outlet (7) operating in the same direction.

Abstract: A method of increasing the intrinsic viscosity of polyester by means of solid state polymerization, wherein a polyester plastics melt is granulated and after granulation is conveyed into a thermal treatment container (13) for thermal treatment therein, the granules being produced slightly below their melting temperature and being fed into the thermal treatment container (13) immediately after granulation so as to utilize the residual heat in the granules, as well as an arrangement for increasing the intrinsic viscosity of polyester by means of solid state polymerization with a granulating and a thermal treatment unit, with an unheated, thermally insulated container (13) or a container (13) having wall heating means (15) being provided as the thermal treatment unit, which is directly connected to the granulating unit via a conveying device (11, 36, 37).

Abstract: The invention relates to a vented extruder (1) for the devolatilization of a polymer material, encompassing at least one extruder barrel (2) with at least one rotatably driven extruder screw (3) mounted in the extruder barrel (2), and with at least one material feed and with at least one extrudate outlet, and also with at least one vent zone (9). A particular feature of the vented extruder (1) is that the gas output for the gas arising in the vent zone (9) has been provided upstream of the material feed, in relation to the direction of conveying of the polymer material.

Abstract: An extruder with a housing comprising parallel, partially inter-engaging bores and screws disposed therein is used when applying a method of feeding powdery bulk materials into such an extruder. A solid transport of powdery bulk material takes place in an inlet zone disposed downstream of a feed opening wherein said inlet zone is partially filled. The inlet zone is provided with at least one gas-permeable wall portion wherein a layer of bulk material is created on said wall portion, thereby preventing bulk material from passing through, The gas-permeable wall portion is connected to a vacuum source and to a pressure gas source. Furthermore, the gas-permeable wall portion has an inner wall which is set back with respect to the wall of the bores, thereby forming a gap with a partially annular cross section wherein a layer of the bulk material is formed in the gap.

Abstract: The invention provides a continuous process for removing organic solvents from a marc including the steps of: continuously introducing the marc into a desolventiser; introducing an inert, gaseous stripping medium into the desolventiser; removing the organic solvents from the marc by maintaining a sub-atmospheric pressure inside the desolventiser, thus providing an organic solvent-desolventised material; and continuously extracting the organic solvent-desolventised material from the desolventiser; wherein step (a) and (d) comprise compacting the marc and the organic solvent-desolventised material into a first and second plastic, substantially gas-impermeable mass respectively and extruding the first and second plastic mass through an annular gap, the opening of which is controlled by the rate of supply of the first and second plastic mass. The invention also provides a device for compacting a moist organic material into a first plastic gas-impermeable mass which is useful for implementing this process.

Abstract: A homogenising and kneading mixer comprising a premixer (12) placed upstream from a kneader and at least two kneading screws (20, 21) in turn connected with a vacuum tank (37) feeding final compression screws (44), in which the kneader has a containment cylinder (19a, 19b) and respective kneading screws (20, 21) realised in portions of different diameter, a first portion of smaller diameter (19a, 20a, 21a) arranged at a pasta scrap feeding conduit (25) and a second portion of greater diameter (19b, 20b, 21b) arranged at the premixer (12).

Abstract: An apparatus and a method for producing woodfuel briquettes, pellets, compounds, composites, agglomerates, or granulates as source material for subsequent processing in injection molding or extrusion processes, includes a pressing screw with screw spirals, which rotate around a longitudinal axis and which are arranged inside a screw shell. The feed material is conveyed to the pressing screw via a feed chute located at an input side. At the end of the pressing screw, processing tools are arranged, to which the feed material is conveyed by the rotating screw spirals. In the area of the processing tools, the residual moisture in the feed material evaporates due to the heat generated during the processing procedure, and is vented as a steam flow from the apparatus through the screw shell.

Abstract: A device for the preparation of plastics material, in particular thermoplastic plastics material, has a receiving container (1) for the material, the interior of the receiving container (1) having tools (21) provided therein which are arranged on a carrier disc (9). The tools are driven by a shaft (4) for rotation about the, in particular vertical, axis (8) of the shaft (4). At least one screw (17) is provided for the removal of the material out of the receiving container (1). The screw housing (16) has a feed opening (27) which is connected with respect to flow to a discharge opening (15) in the container (1), which discharge opening (15) is situated at a lower level than the carrier disc (9) and the tools (21) carried by it. Further moved tools (12), which convey the material into the discharge opening (15), are provided in the receiving container (1) below the carrier disc (9).

Abstract: A method and apparatus for making pellets of wood meal compound according to the present invention is constructed in such a manner that synthetic resin material and wood meal material are supplied into a hopper (3) in a most upstream position, and kneaded in a long kneading section (6) having no side feeder (2), thereby to obtain pellets from mixed material having more uniform properties than in the prior art.

Abstract: In a conventionally used injection molding apparatus, undried resin pellet is put in a drier of a predetermined temperature and water and gas in the undried resin pellet is completely removed, and the dried pellet deprived of water and gas is thrown into the injection molding apparatus. It is therefore necessary to carefully control quality of water and gas of pellet before pellet is thrown into the injection molding apparatus. In injection molding of undried resin pellet, evaluate injected resin, control operation conditions such as the feeding amount of pellet and the decompression degree, and determine the best operation conditions and the best accumulation amount wherein excellent articles are obtained. The accumulation amount of pellet fed in an injection molding chamber is detected, and feeding to the injection molding chamber is controlled upon the detection information.

Abstract: A process for producing a component from a sheet molding compound (SMC) material includes raw-material preparation, semi-finished product production and component shaping.

Abstract: An apparatus for manufacturing moldings by which clear colors and patterns can be brought out without a remarkable lowering of strength. Immediately before delivery to a metal mold, outer resin material positioned on the main cylinder inner wall side is put in the molten state, and inner resin material positioned on the main screw side is controlled to be from the softening temperature to the melting temperature both inclusive to be extrusion-molded as they are. The inner wall of the main cylinder is expanded where the outer resin material is received to help the outer resin material be thrown in smoothly.

Abstract: The invention relates to a process for the granulation of sludge- and/or dust-form material, in which the material to be granulated is mixed with hydratable or hydraulically settable solids and water, which solids react exothermically with water and act as binder in the mixture, where the solids are allowed to hydrate or set fully or partly, and where the mixture containing the fully or partly hydrated or set solids is shaped into granules, where the solids and, if desired, dust-form materials to be granulated are wetted or moistened with water, and subsequently and/or at essentially the same time the solids are mixed with the material to be granulated. The invention also relates to an apparatus for carrying out the process.

Abstract: Equipment for extruding an expanded polymer sheet or plate comprising an apparatus for the gravimetric loading (11) of a certain number of component polymers and/or mineral fillers, an extruding apparatus (17) consisting of a thermally controlled co-rotating twin-screw extruder (20) with a length ratio of at least 1/34 diameters, a loading pump (38) downstream of the extrusion apparatus, a static group (41) for the mixing and thermal conditioning of the mixture pumped, inserted in a thermo-regulated cartridge (42), a stratifier (44, 45) and a flat head (43), wherein, in at least one portion of the extrusion apparatus (17), there is an injection zone (29, 32) into which gas, such as CO2, coming from a container tank (30, 34), is introduced.

Abstract: An aromatic polycarbonate extruder which is a twin screw extruder for kneading components into a molten aromatic polycarbonate, the extruder having at least one module consisting of a kneading unit, a material seal unit, a back kneading unit and full-flight unit which are arranged from an upstream side to a downstream side and a method of kneading components into an aromatic polycarbonate by using the above extruder. The present invention also provides a kneading apparatus and method for producing an aromatic polycarbonate which has an extremely small content of foreign matter and is free from residence deterioration such as coloration, crosslinking or gelation when the aromatic polycarbonate is to be kneaded with various components.

Abstract: An aromatic polycarbonate extruder which is a twin screw extruder for kneading components into a molten aromatic polycarbonate, the extruder comprising at least one module consisting of a kneading unit, a material seal unit, a back kneading unit and a full-flight unit which are arranged from an upstream side to a downstream side and a method of kneading components into an aromatic polycarbonate by using the above extruder. The present invention can provide a kneading apparatus and method for producing an aromatic polycarbonate which has an extremely small content of foreign matter and is free from residence deterioration such as coloration, cross-linking or gelation when the aromatic polycarbonate is to be kneaded with various components.

Abstract: A method and apparatus (20) for extruding fibre cement. The extruder comprises a casing (30) with a pair of inter-meshing self-wiping screws (40) rotatably mounted therein. The screws continuously mix and or knead the components of the fibre cement provided through various feed means (61, 62) to form a substantially homogeneous paste and force the paste through a die (50) to form a green cementitious extrudate suitable for curing.

Abstract: The invention concerns a device for homogenizing, mixing and/or granulating chemicals which consist of at least one component, particularly additives, by means of an extruder consisting of several housing segments, at least one worm, a nozzle arrangement and at least one cutting device.

Abstract: The invention relates to a gear extruder for plasticizing and homogenizing rubber mixtures, having at least two gears disposed in chambers in the extruder housing, with the teeth of the gears meshing with one another, and having a port for feeding the rubber mixture to the front of the gears in the extruder housing. The invention is characterized in that gas vent ports are provided in the extruder housing, at the ends of the teeth of the gears, in an area in which the teeth disengage, and/or that at the entrance side of the teeth filled with the rubber mixture. The gas vent ports are provided in the extruder housing in one embodiment so that they extend on the entrance side over no more than half of the circumference of the chambers. By such an arrangement of gas vent ports it has become possible to ventilate a rubber mixture such that volatile components and moisture contained therein can be outgassed, but the rubber mixture is unable to enter the gas vent ports and clog them.

Abstract: The invention relates to a method and an apparatus for injection molding parts, which comprises a mixture of at least one plastic material and at least one additive in the form of fibrous or powdered fillers or reinforcement materials.

Abstract: The device for extracting undesired substances, such as volatile components of low molecular weight, free gases, liquids and the like, from the cylinder of an extruder, in particular for thermoplastic materials, includes a casing defining internally an oblong cavity communicating at one end with the internal cavity of the extruder; at least one screw mounted for rotation in the oblong cavity, substantially parallel to the longitudinal axis thereof; and vacuum means for creating a depression in the oblong cavity. The longitudinal axis of the oblong cavity forms an angle of between 0° and −45° with a horizontal plane passing through the axis of the cylinder of the extruder.

Abstract: This invention relates to an apparatus and method for introducing various additives in solid form into a soap mass for the ultimate manufacture of soap bars. Specifically, the invention is directed to producing soap bars having a multicolored or marbleized appearance and made from a variety of different colored soap materials. Soap pellets having a color are introduced into a soap plodder as is customary. A second or alternate color of soap pellet is separately introduced into the interior of the plodder just before that point where the helical screw of the plodder enters the barrel of the extruder portion of the plodder.

Abstract: The invention relates to a gear extruder for plasticizing and homogenizing rubber mixtures, having at least two gears disposed in chambers in the extruder housing, with the teeth of the gears meshing with one another, and having a port for feeding the rubber mixture to the front of the gears in the extruder housing. The invention is characterized in that gas vent ports are provided in the extruder housing, at the ends of the teeth of the gears, in an area in which the teeth disengage, and/or that at the entrance side of the teeth filled with the rubber mixture. The gas vent ports are provided in the extruder housing in one embodiment so that they extend on the entrance side over no more than half of the circumference of the chambers. By such an arrangement of gas vent ports it has become possible to ventilate a rubber mixture such that volatile components and moisture contained therein can be outgassed, but the rubber mixture is unable to enter the gas vent ports and clog them.

Abstract: A system for making extruded cement-based articles. The process can include forming a cement-based feed mixture including water, aggregate and binder and directing the feed mixture to a vacuum zone, wherein sufficient vacuum is maintained in the vacuum zone to remove entrained air and, preferably, excess water, from the feed mixture. The feed mixture is held in the vacuum zone at a negative pressure for a time sufficient to form a vacuum-treated or densified mixture. The vacuum-treated or densified mixture is passed through an extruder at an elevated pressure to provide an extruded cement-based article.

Abstract: A method of and device for removing a liquid from a resin of high melting point by means of a co-rotating twin extruder and an operation system of a liquid removal molding of a resin of high melting point by which a scaled down, highly effective, high performance and continuous stable operation of the device may be achieved.

Abstract: The present invention is directed to feeding steam, which is let out of a stream outlet, into the conditioning stage of an installation for boiling extrusion of products. In the installation according to the invention, a connecting line is provided from the aforementioned steam outlet to a predetermined point on the conditioning stage.

Abstract: Devolatilization of molten polymer is carried out using a vertical static mixer which opens directly into a flash tank. Expansion of a stripping agent injected at an inlet of the static mixer occurs in the static mixer and the continued shearing causes disengagement of the vapor from the polymer, so that expansion is complete before the polymer enters the flash tank and stripper and volatiles are removed by a pump and condenser arrangement which holds the flash tank at a reduced pressure. Polymer outlets are in the floor of the flash tank and have metering pumps at their bottom end.

Abstract: A screw extruder mechanism for the processing of strongly outgassing materials comprises a main extruder for proper material processing, a material feed and discharge device and a degassing device on the main extruder for the discharge of the gas stream from the portion of evaporation. For the gas stream to branch into at least three separate streams, the degassing device comprises a first degassing port and at least two degassing elements which are opposed radially to each other in relation to the main extruder and are disposed between the portion of evaporation and the first degassing port and which are designed preferably as ancillary screw extruders opening radially into the main extruder.