Abstract: Processing, particularly extruding polyolefins having low MI, narrow MWD at extrusion temperatures less than about 200.degree. C. and at shear rates less than about 2000 sec.sup.-1 but immediately above the shear rate corresponding to the end of the slipstick region of the polyolefin produces a new window of processing conditions to produce smooth polymers that do not have sharkskin melt fracture or wavy surfaces.

Abstract: A cross-head die assembly for applying a coating material, such as plastic insulation, to a continuous filament, such as an electrical wire, includes the usual body with axial bore, through which the filament is moved, and radial bore, through which the coating material is introduced. The assembly further includes a die member, a tip holder and a tip, all positioned and releasably held in assembled relation within the body axial bore. The tip holder includes an annular groove communicating with the body radial bore for flow of molten material through the radial bore and about the annular groove. A flow passage, preferably a plurality of axial grooves in the tip holder, provide flow of the molten material from the annular groove to the die member orifice.

Abstract: The invention concerns an electrically insulating body including at least two polymer materials and a method of making such a body. It is characterized in that its internal structure (61) is mainly formed by a first polymer material and that its surface structure (60, 62) is mainly formed by a second polymer material, said first polymer material having a higher molecular weight than said second polymer material. The proportion in the body of the first polymer material relative to the second polymer material reduces progressively from the internal structure (61) towards the surface structure (60, 62). The invention is applicable especially to insulating electric conductors (26) and enables insulators to be obtained having both a high dielectric strength and a good quality of shape.

Abstract: An extruder head has an inner die member (5) housed in a supporting body (2) and provided with a central duct (6) continuously passed through by a semifinished product (7). An outer die member (9) exhibits a shaped housing (10) defining, in cooperation with the inner die member (5), an outflow port (11) for the mixture to be applied to the semifinished product (7). The shaped housing (10) is defined in a centering element (12) rotatably housed, according to an oblique and incident axis relative to the axis of the central duct (6), within an intermediate collar (13) rotating in the supporting body (2) in coaxial relation with the central duct itself. By rotating the centering element (12), the outflow port (11) moves from a centered position to a maximum-eccentricity position with respect to the central duct (6). The rotation of the intermediate collar (13) modifies the orientation of the common plane containing the axes of the outflow port (11) and central duct (6).

Abstract: Extrusion impregnating device for continuous production of unidirectionally fibre-reinforced polymer mouldings with fibre contents between 50 and 70 vol-%, which makes it possible to produce linear profiles with circular, oval or rectangular cross-sections while at the same time enabling high-quality impregnation and the attainment of excellent mechanical characteristics.

Abstract: A technique for manufacturing extruded drip irrigation lines including drip irrigation elements having a non-circular cross section including the steps of:extruding a drip irrigation conduit; andheat welding discrete drip irrigation elements having a non-circular cross section to a portion of the interior surface of the drip irrigation conduit extending over less than the entire circumference thereof, the step of heat welding including the following steps:sequentially feeding discrete drip irrigation elements through the interior of the drip irrigation conduit;causing individual drip irrigation elements to establish initial contact with the extruded conduit as the extruded conduit is being stretched to its final cross sectional dimensions; andcompleting heat welding of the elements to the conduit when the conduit has substantially reached its final cross sectional dimensions.

Abstract: A device producing a weather strip is shown, which includes (a) leading a first uncured pasty material into a certain shaping passage to produce an uncured shaped molded strap; (b) applying continuously a second uncured pasty material onto a given portion of the uncured shaped molded strap while the latter is being moved in the certain shaping passage thereby to produce a layered uncured shaped molded strap; and (c) curing the layered uncured shaped molded strap.

Abstract: The present invention is directed to a method and apparatus for applying a flowable material to a surface for forming molding thereon. An embodiment of the present invention includes a body member having top, bottom, front and rear surfaces. An inlet is operably associated with the body member for receiving flowable material from a supply source. An outlet is operably associated with the body member to dispense the flowable material through the body member. At least one passageway extends between the inlet and the outlet. A molding head formed in the body member shapes the flowable material to form at least one strip of molding on the surface.

Abstract: A process and apparatus for producing an elongated body changing in elastic modulus longitudinally thereof with use of polymers without resulting in variations in the outside and inside diameters of the body even when the polymers are different in extrusion characteristics or swelling characteristics. The apparatus may include a feeder 1 for extruding a first polymer in a molten state and a feeder 2 for extruding a second polymer, which is different from the first polymer in elastic modulus and similarly in a molten state. The feeders alternately discharge the respective polymers, which are continuously fed to a long-land die 5 along with a lubricant supplied from a lubricant applicator 4. The polymers are formed into the desired shape and cooled in the die 5, and thereafter extruded.

Abstract: Disclosed is a light waveguide ribbon mold having a nozzle port shaped to closely receive the heated nozzle of a portable melt adhesive gun. Light waveguides are pulled by hand through a slot in the mold so that the melt adhesive forms a ribbon matrix around the light waveguide. The ribbon cools and hardens upon exiting from the mold.

Abstract: In an apparatus for forming filled via holes in ceramic substrates or wafers, upper and lower masks or dies each having at least one hole are clamped between opposing injection and base members with a wafer placed between the masks. The injection member has an injection chamber containing conductive ink material which is connected with the or each hole in the upper mask. An injection device such as a piston is used to force ink out of the chamber through the or each hole in the adjacent mask, punching one or more plugs of wafer material out of the wafer and replacing each punched-out plug with ink material, the plugs being pushed into the or each aligned hole in the other mask, which acts as a stripper. In one version, each die has a single hole and filled holes are formed sequentially at successive points on the wafer. In an alternative, each die or mask has a plurality of holes and the filled holes are formed simultaneously.

Abstract: In a method of feeding a plastic material to a using apparatus such as a molding press or an extruder, a moldable or extrudable plastic material in elongated strand form is provided. The moldable or extrudable plastic material is arranged such as in a package comprising a plurality of convolutions. The package is supported adjacent to the using apparatus and successive increments of length of the elongated strand material are payed out and fed into the using apparatus.

Abstract: An apparatus for and a method of manufacturing a fiber reinforced thermoplastic sheet-shaped molding including a pre-impregnating process and a final impregnating process. A sheet of thermoplastic resin and a web of reinforcement fibers are supplied through the pre-impregnating process during which the thermoplastic resin is sucked under the influence of a suction force so as to partially penetrate into interstices in the reinforcement fiber web while both are transported around and by a perforated rotary drum, thereby to form a first preformed sheet. The first preformed sheet is subsequently supplied to the final impregnating process during which an impregnating machine is employed. As the first preformed sheet is passed through the impregnating machine while compressed inwardly and heated, the thermoplastic resin is allowed to completely penetrate into the interstices in the reinforcement fiber web to complete the fiber reinforced thermoplastic sheet-shaped molding upon cooling thereof.

Abstract: Apparatus for the production and proper calibration of improved flexible hoses made by a soft thermoplastic material reinforced with a continuous spiral of rigid thermoplastic material. During their production the hoses do not rotate but are produced linearly and in their internal surface no longitudinal grooves are engraved. The melted coaxial materials are discharged through a rotating mechanism to a calibration unit which rotates with it and bears peripherally special inclined rollers on which is transmitted, via an epicyclic gearing system, a controlled rotation opposite to the above direction. On this calibration unit the plastic hose is formed successively, advancing linearly forward.

Abstract: A process for preparing a composite product from an intake material incorporating commercial, municipal or industrial waste containing organic, plastic and fibrous material includes first granulating and sizing the material. The material is then heated in three consecutive phases, first at a temperature sufficient to achieve an internal temperature within the material of about 215.degree. to 250.degree. F., then at a temperature sufficient to achieve an internal temperature within the material of about 250.degree. to 320.degree. F. and then at a temperature sufficient to achieve an internal temperature within the material of about 320.degree. to 400.degree. F., wherein said material is continuously mixed during said heat phases. The material may then be co-extruded with a reinforcement structure and forced into vacuum profile dies to form a product or compression molded to form a product and cooled.

Abstract: An extrusion tool is provided for extruding a coating jacket onto a least one pre-coated conductor or conductor bundle. The extrusion tool comprises a frame, a first conical element, a second conical element, and a die. The frame is formed to include a port positioned to receive a coating material. The first conical element is mountable on the frame and is formed to include a bore, the bore being sized to allow passage of the pre-coated conductor or bundle therethrough. The second conical element is mateable with the first conical element and cooperates with the first conical element to define a first flow passageway therebetween. The first flow passageway is positioned to receive the pre-coated conductor or bundle as it exits from the bore and is connected in fluid communication with the port to supply an initial portion of the coating jacket. The second conical element also includes a tapered portion and terminates in a cylindrical tip.

Abstract: Dual extrusion apparatus with a horizontal extruder and a vertical extruder connected to an extruder head and in which the weight of the vertical extruder is carried by a frame. The vertical material extruder is permitted to expand upwardly under temperature variations so as to minimize stress. Also, the extruder head and the vertical extruder are movable together horizontally to comply with temperature induced expansion and contraction.

Abstract: An extrusion die for adhering a tape on a rubber article which is extruded is composed of a die base fixed to an outlet port of an extrusion head to form a nozzle for allowing the article to extrude, a tape supply member connected with the die base which is oriented at adjacent a first surface of the article to partially supply the tape toward the first surface for allowing to mate the both so as to form a lamination, and a pressurizing member movably connected with the die base oriented at adjacent a second surface of the article to pressurize the article toward the tape for adhering the both. The pressurizing member is slidably reciprocated with respect to the direction of the article extruded to keep a distance from the article when the tape is not supplied thereto.

Abstract: A method for producing a plastic product including an axially extending portion, such as a duct or pipe, and a radially extending portion, such as a flange or bracket. A parison is placed in a first mold cavity defined in a mold and blow molded to form the axially extending portion, and then a movable mold segment is moved to a retracted position to define a second mold cavity adjacent to a part of an outer peripheral surface of the axially extending portion thus formed. Then, a second molted plastic material is supplied into the second mold cavity and the movable mold segment is again moved to another predetermined position to pressurize the second plastic material to thereby form a radially extending portion. The resulting hollow plastic product is extremely high in structural integrity between the axially and radially extending portions.

Abstract: A die arrangement that will attach to the discharge of a conventional grinding or extruding machine to shape discharged food product onto a ramp and including means to secure a forming block to a distributor member to feed foodstuffs to the forming block and an adapter to selectively seal the connections between the adapter, distributor member and forming block and to release such sealing engagement for easy removal and replacement of the forming block.

Abstract: A method of forming a hose assembly (10) of the type adapted for carrying fuels and other corrosive fluids. An inner liner (16) of a fluorocarbon material is extruded. The inner liner (16) is then passed through a reservoir containing a dispersion including a fluorocarbon polymer material and a fluid. Glass fibers are then braided about the exterior of the inner liner (16) to form a braided layer (18) having the dispersion thereabout such that the dispersion penetrates the interstitial spaces of the braided layer (18). Subsequently, the assembly (10) is heated to remove the fluid. The assembly is then sintered to cure the fluorocarbon polymer material into a coating dispersed throughout the braided layer (18) and about the inner liner (16).

Abstract: An apparatus for forming an annular liner is equipped with a molding assembly which includes a press tool assembly and an anvil. The container closure shell is fed onto the anvil. The press tool assembly has a resin flow path and a means for forcibly flowing a synthetic resin material through the resin flow path. A notch is formed in the upstream portion of the resin flow path. When the molding assembly moves with respect to the feeding nozzle, the synthetic resin material discharged from the discharge port of a feeding nozzle enters into the upstream portion of the resin flow path via the notch, and is cut away from the feeding nozzle.

Abstract: A process and apparatus for manufacturing a frame with a groove such as a molding for use with a panel such as a windshield of an automobile. The process includes the steps of preparing a dummy panel having an outer configuration and a thickness equal to those of the panel, and continuously moving an extrusion port of a molding die means along the peripheral edge of the dummy panel so that a molding product is continuously formed along the peripheral edge of the dummy panel. The molding product is stripped from the peripheral edge of the dummy panel to obtain the frame with a groove. The groove is closely engageable with the peripheral edge of the panel. The apparatus includes a dummy panel having an outer configuration and a thickness equal to those of the panel, molding die means having an extrusion port, and moving means for moving the extrusion port of the molding die means relative to the peripheral edge of the dummy panel.

Abstract: Crosshead deflector for extrusion wire coating, including a wire guide tube carried in a holder, which holder is mounted in the main bore of a main body; a radial passage enters the main bore to introduce molten plastic and the holder is formed to bring about even flow around the guide tube for application to the wire as it moves out of the tube.

Abstract: Method and apparatus for applying a layer of insulation around an electrical cable core in which the contaminant size is not greater than about 200 microns. Unplasticized insulation material, such as polyethylene, is supplied to an extruder which forces the material through a filter which prevents the passage of contaminants having a size greater than about 200 microns and in which there is a pressure drop. The filtered material is delivered to a pump which increases the pressure thereon and forces it through a static mixer at the output of which the filtered material is delivered to the cross-head of extrusion apparatus which applies the filtered material to the cable core as it is advanced longitudinally. If the insulating material is to be cross-linked by a cross-linking agent, the agent is injected into the filtered material between the pump and the mixer.

Abstract: A device for applying a thin layer of joint compound to the inner and outer surfaces of a corner bead. The device includes a hopper for supporting a quantity of joint compound. The hopper has two openings which are aligned with one another and have a cross-sectional configuration corresponding to that of a corner bead. The device includes rubber panels for closing off a selected portion of the openings. In use, a corner bead is inserted through one of the openings, pushed through the hopper where joint compound adheres to the bead, and is extracted from the other opening. The rubber panels scrape off all but a thin layer of joint compound from the concave surface of the bead and forces the bead against the bottom of the hopper so as to permit only a thin layer of joint compound to remain on the convex surface of the bead.

Abstract: A binding rubber extruder for retreading tires is provided with an extruder head, an axis of which extends essentially vertically to a surface of a carcass. The revolving speed of the rotatably drivable carcass and the extrusion speed are adjusted relative to one another. The extruder head is provided with a nozzle, that has a radius of curvature that corresponds at least to a greatest radius of the carcass whereby the nozzle is pressable against the carcass surface with a gentle, elastic force.

Abstract: Jacket extrusion apparatus in which a core tube located within an extruder head is provided with axial projections which are spaced around the tube. The projections break down accumulated drool from the extrudate and cause it to move away as small particles.

Abstract: A method of and an apparatus for biaxially orienting a crystalline thermoplastic resin film and subsequently thermally processing the film with first and second heating devices, in which the temperatures of respective heaters for biaxially orienting the film are separately controlled, the first heating device being operated by a tubular method or a tenter method, and the second heating device being operated under a tenter method and above the temperature in the first heating device, whereby a melting and sticking of the film is prevented and the bowing ratio is decreased.

Abstract: A method of and apparatus for simultaneously extruding a coating comprising a plurality of layers of dissimilar plastic compounds having substantially different melting points onto a moving electrical conductor wherein the plastic compounds are mechanically and thermally separated and the conductor is centered in the plastic jackets by a center trim guide, said trim guide having replacable guide tips. Separating the two plastics prevents thermal degradation of the two extrudates by causing their melt temperatures to remain substantially constant.

Abstract: A coated wire or other elongated article production system having means to form wire or other elongated article in tandem with an extruder of substantially solvent-free polymer in tubular form around the wire or article. The tubular polymer is applied to the wire or article with the aid of a vacuum, and the froming speed relative to the rate of polymer extrusion is controlled to thin the tubular polymer between its extrusion and its contact with the wire or article.

Abstract: A machine for compressively applying an outer cementitious coating received from a pressurized source on a continuous pipeline as well as on pipeline segments includes a cementitious material accumulating chamber with an aperture for receiving the pipeline thereinto. An injection manifold is in flow communication with the pressurized cementitious coating source and is oriented about and in flow communication with the accumulating chamber for evenly delivering the cementitious coating about the pipeline in the accumulating chamber. A frustoconical compression chamber having a wide and a narrow diameter concentrically joins the accumulating chamber at its wide diameter for receiving the pipeline and compressing the cementitious coating about and onto the pipeline. A forming chamber is concentrically oriented and adjoining the compression chamber at its narrow diameter for troweling and finishing the cementitious coating also having a coated pipeline exit aperture.

Abstract: Extrusion method and apparatus for producing a molding strip wherein an outer polyurethane plastic layer is interbonded at its inner surface to the outer surface of a flexible PVC plastic body is disclosed. A single die is utilized to produce the molding strip. The polyurethane plastic layer and the flexible PVC plastic body are interbonded while in a molten state within a bonding chamber of the die so that the polyurethane plastic layer does not separate from the PVC plastic body during use of the molding strip. The polyurethane plastic layer is interbonded with the PVC plastic body without totally encapsulating the PVC plastic body so that the molding strip can be adhesively secured to a side body panel at the PVC plastic body. The outer surface of the polyurethane plastic layer can be painted to match the color of the side body panel. Preferably, a reinforcement strip is embedded in the PVC plastic body within the bonding chamber to give the molding strip additional strength.

Abstract: An extruder with at least one bore, in which an extruder shaft is arranged to be rotatingly driven, has a device for introducing a glass fibre strand. To this effect the shaft is provided with an adjustable throttling device, upstream of which starts out an impregnating channel which opens again into the bore downstream of the throttling device seen in conveying direction, i.e. into a mixing zone, in which the fibre strand is cut into fibre sections. An especially intense impregnating of the fibres of the fibre strand is thus achieved.

Abstract: A method and apparatus for extruding single or multiple layers of plastic on an electrical conductor without having to adjust the concentricity of layers every time the tooling is changed to make different sizes.

Abstract: A coating apparatus having a first slot between its front and center edges and a second slot between its center and back edges, wherein a coating solution is extruded continuously from each of the slots onto the surface of a flexible support running continuously along the edge surfaces of the front, center, and back edges in that order.The front edge surface has a straight-line portion on at least the terminal end portion of the front edge so that the straight-line portion extends along the direction of movement of the support and is not longer than one mm, and at least one portion of the center and back edge surfaces protrudes from the extension line of the straight-line toward the support.The coating apparatus is suitable for preparing magnetic recording media.

Abstract: A process and device for producing a rubber tube having a smooth outside surface in which a molten synthetic resin is heated from the inner circumferential side immediately before it flows from a die along the periphery of a rubber material layer and the rubber mentioned is cooled within the die.

Abstract: An apparatus for measuring eccentricities of a rod of plastic material extruded from an extruder includes an optical sensor arrangement having a central axis, the arrangement including a pair of optical sensor devices circumferentially spaced at 90 degrees to one another about the central axis and a pair of light sources disposed on sides of the central axis opposite to the respective optical sensor devices for providing shadows of the rod on the optical sensor devices. A mounting fixture supports the sensor arrangement with its central axis aligned with the nozzle axis of the extruder so that the extruded rod will travel along the central axis of the sensor arrangement. An output device is connected to the sensor devices for measuring deviations of the shadows from predetermined positions indicating concentricity of the rod.

Abstract: An adjustable extrusion coating die having an inner block member, an outer block member, a mandrel mounted on said inner block member spaced from said outer block member at a predetermined distance, and means for maintaining said predetermined distance substantially constant.

Abstract: Polymeric material is plastified in an extruder and is then divided into a major part and a minor part. Either the major part or (more often) the minor part is modified by a chemical reaction, such as grafting (any necessary ingredients being added, if not already present). The major and minor parts are then recombined in an extrusion head so that the modified and unmodified materials form distinct parts of the product. In this way, a single extruder can be used to make, for instance, a product with surface characteristics modified by grafting, wire-covering with only a surface layer crosslinked, or heat-sealable crosslinked packaging film.

Abstract: Continuous lamination of ABS and polymethylmethacrylate (PMMA) is achieved employing a continuous sheet or reel of PMMA 0.1 inch to 0.250 inch thick optionally preheated on one side; a web of ABS is extruded at about 450.degree.-550.degree. F. from pellets onto the PMMA at the nip of a roll stack. In the roll stack, the two laminated layers are compressed and gradually cooled. The laminate displays properties of both ABS and acrylic. It has excellent thermoforming properties.

Abstract: Coextrusion apparatus for varying the inner profile of a generally tubular extrudate formed by a first stream of elastomeric material by an axially movable inner die ring which varies the size of an orifice and consequently the flow of a second stream of elastomeric material which is deposited on the inner surface of the tubular extrudate. A compensating ring is axially slidably mounted within the inner die ring and moves generally in an opposite direction to the movement of the die ring to compensate for pressure changes within the second stream of material caused by varying the size of the orifice, to provide an accurately controlled initiation and termination of the material. Pistons are formed integrally on the inner die ring and compensating ring and are located within annular fluid pressure chambers whereby the flow of fluid into the chambers will coordinate the movement of the die ring and compensating ring.

Abstract: A method of producing a thread-reinforced, extruded rubber body by a shear head wherein the threads are continuously supplied, embedded in a rubber mixture which is in a continuous forward motion and fixed in the rubber body by vulcanizing the rubber mixture. The method is such that the reinforcing threads are helically twisted in the finished rubber body. The rubber body is thus reinforced not only in longitudinal direction but also additionally in circumferential direction.

Abstract: A method of making a fire hose including the steps of extruding a tube having inner 12 and outer coverings of elastomeric material on a woven jacket made from woven synthetic textile yarns and having a weft which is unusually highly crimped. The extruded tube is placed in a confining mould or sheath having an internal diameter substantially the same as the external diameter of the hose, curing the material of the tube by internal application of heat and pressure, pressing the outer covering into tight engagement with the sheath. The sheath effectively prevents radial expansion of the hose during the curing and the outer covering is thus embossed with the surface topography of the inner surface of the sheath upon removal of the sheath. The hose thus formed has good diametral swell properties and consequently reduces the frictional forces in relation to the amount of water flowing through the hose.

Abstract: There is provided cross-head type die apparatus for applying a substantially concentric insulating layer to a conductor passing therethrough. Die assembly elements of novel structural combination are disposed within the substantially cylindrical cross-head such that they are in axial alignment with each other and the cross-head. In particular, a die insert or die tip has a front portion which tapers inwardly to substantially a point and includes an outlet orifice to guide the conductor along a passline towards a die orifice. A flow guide has a respective internal surface which tapers rearwardly to form a die orifice on its front surface. Cooperatively tapered surfaces securely fit the flow guide and the die tip within the cross-head axial bore such that a space is formed between the internally tapered surface of the flow guide and the front portion of the die tip. The die orifice and the outlet orifice of the die tip are axially aligned due to their respectively tapered fits within the cross-head.

Abstract: An apparatus for manufacturing a silicone gel material has a pair of tanks for separately storing and kneading first and second liquids gel forming materials, a feeder feeding the liquids while kneading them, a debubbling unit with a debubbling tank for removing air bubbles contained in the materials from the feeder and turning the tank upside down to discharge into a hopper, a nozzle for discharging silicone gel material received from the hopper in a predetermined thickness onto a lower film moving below the nozzle, an upper film supplier placing an upper film onto the film of silicone gel material, upper and lower rollers rolling the upper and lower films and the film of silicone gel material into a laminated strip, a belt conveyor receiving the laminated strip, a heating tunnel for gelling the silicone gel material and a strip take up device at the exit of the heating tunnel.

Abstract: A process for reducing die drool during extrusion of highly filled polymeric resins for production of jacketing insulation for wire and cable by incorporating into the surface of the die in contact with said resin a compound which decreases the adhesiveness between the polymeric resin and the die surface, said compound being employed in an amount sufficient to reduce die drool.

Abstract: Process for the manufacture of continuous moulded bodies from structures of reinforcing fibres impregnated with thermoplastic plastics, wherein a structure of reinforcing fibres is passed through a melt of the thermoplastic at a pressure of 1 to 800 bar for a length of at least 300 mm and a device for carrying out the process.

Abstract: An improved process for manufacturing low density polytetrofluoroethylene insulated cable using a paste type extrudate to form a hollow tube of insulated material extruded about a wire conductor which passes through the extrusion die. As contrasted with earlier methods, the shaped extrudate paste is stretched before removing the extrusion aid substantially at ambient temperature with only residual heat imparted by extrusion by a driven pulley, the peripheral speed of which may be varied in accordance with the speed of the extrudate. With the completion of the stretching, the increased outer surface and porosity of the extrudate permits faster removal of the extrusion aid immediately prior to entering a sintering oven.

Abstract: Apparatus for the extrusion-coating of a core, especially of an electrical conductor, with a sheathing having at least two layers or strips of different materials or differently colored materials, the apparatus having feed conduits for the plasticized materials and outflow passageways through which the core to be extrusion-coated can pass, the outflow passageways being selectively connectable to the feed conduits via a distributor device. In order to avoid the need for cleaning the conduits of the distributor device, the distributor device is formed by a sleeve (8) which is arranged rotatably between end positions in relation to an outer housing (1) having feed conduits (2, 3) for the plasticized materials. The sleeve also has a number of conduits corresponding to the number of materials to be extruded, to connect feed conduits (2, 3) alternately to the outflow cross-sections (15, 20) for the plasticized materials.