Abstract: The apparatus of this invention includes a container for holding paste ingredients, a mixing and kneading assembly for preparing the food paste within the container, and an extrusion system for pressing the paste into a desired noodle shape. The mixing and kneading assembly comprises a plurality of mixing blades attached to a centrally located cylinder within the container. In a first embodiment, the assembly further includes a scraper blade and a kneading blade. The scraper blade is fixed at a constant distance from the bottom wall of the container such that paste is scraped from to the bottom wall as the scraper blade is spun. In a second embodiment, the assembly further includes a plurality of kneading blades without a scraper blade. In both embodiments, the kneading blades each have a leading and trail edge that remain substantially parallel to the bottom wall of the container.

Abstract: A method which includes a flashing process and a process for extruding thermoplastic plastics is provided for achieving more thorough devolatilizing of the solutions of thermoplastic plastics, to ensure that the solutions of thermoplastic plastics are able to be worked continually, wherein the accoustic treatments are introduced into both processes to increase the efficiency of removing volatile components and thus leads to the decrease of the processing time for extruding thermoplastic plastics. In the flashing process, the ultrasonic horns are arranged to scatter the feed stream of the solution which increases the devolatilizing surface of the polymer fluid and, simultaneously, to enhance bubble formation and produce strong agitation in the polymer fluid, thereby increasing the devolatilizing efficiency. In the process of extruding thermoplastic plastics, the ultrasonic horns are arranged in the extruder to enhance both formation and rupture of bubbles, thereby increasing the devolatilizing efficiency.

Abstract: An extruder in which the joint between the downstream, forward end portion of a cylinder and a gear pump is always kept tight, so that molten resin material is prevented from leaking out. As the main discharge port of a diverter valve is prevented from shifting from the inhalation port of the gear pump at the joint therebetween, the flow passage at the joint is always smooth without a spot where the molten resin material collects. The quality of resin products thus becomes stable.

Abstract: An improved pasta maker (20) is provided having an upper mixing chamber (130), lower extrusion chamber (132), and a communicating passageway (157) therebetween. The mixing chamber (130) is an open top vessel, and the extrusion chamber (132) presents an outlet (148) adapted to receive a pasta forming die (188). The pasta maker (20) also includes an apertured slide valve plate (26), a powered, rotatable mixing element (170) within the mixing chamber (130) for mixing of the ingredients therein, and a powered, axially rotatable auger (174) within the extrusion chamber (132) for conveying the ingredients towards and through the die (188).

Abstract: A continuous pelletizing system for pelletizing synthetic thermoplastic materials which includes:(1) a melter/mixer for at least partially melting and mixing synthetic thermoplastic material;(2) a gear pump operatively associated with the melter/mixer for increasing pressurization of the melted synthetic thermoplastic material;(3) an independently controlled dispersive mixer operatively associated with said gear pump or the melter/mixer which provides additional independent mixing of the melted synthetic thermoplastic material; and(4) a pelletizer operatively associated with the independently controlled dispersive mixer or the gear pump for forming pellets of synthetic material.

Abstract: A process and an apparatus for the direct, continuous and flexible modification of polymer melts by branching off a branch melt stream from the main melt stream to be modified, dispersing the initially introduced additive in the melt in a specially designed twin-screw extruder, and subsequent recycling of the additive melt concentrate to the melt stream to be modified.

Abstract: Dough intended for use in producing bakery products is homogenized and advanced to extrusion nozzles where it is cut into successive pieces that fall onto a moving conveyor. The pieces are of precisely uniform weight because a constant pressure is maintained on the dough as it is forwarded by a metering pump toward the nozzles. Apparatus for achieving such result includes an auger, a developer positioned downstream from the auger, and a transition chamber fed by the developer and located upstream from the metering pump. A pressure-measuring monitor serves to control the rotational speed of the auger, thereby maintaining the dough under constant pressure within the apparatus.

Abstract: In a thermoplastic material extrusion line having a melt extruder, a gear pump, and a die aligned with one another, the gear pump is supported on a hinged articulable arm for swinging movement into and out of operative disposition in alignment with the extruder to simplify realignment of the gear pump with the extruder and the die whenever it becomes necessary to remove the gear pump from the line for maintenance or service.

Abstract: Side by side extruders provide an extrusion apparatus which has an imposed order of longitudinal displacement of the process material in relation to itself so that cross-shearing is directed to newly aligned material in a manner which achieves volumetric blending with little unproductive shearing. The extrusion apparatus mixes and extrudes polymer like materials with as little waste shearing as possible, so as to preserve the viscosity of the polymer materials and to produce a uniformity processed material of the highest quality possible from the starting materials.

Abstract: A method of thermoplastifying a synthetic resin which is displaced by a worm in a worm housing. High-frequency energy is applied to the plastic in one or more regions along the path of the plastic in which there is no or little frictional heat generated by the interaction of the screw with the housing.

Abstract: A method of manufacturing a rubber mixture includes the step of mixing at a first temperature in a batchwise operation a base mixture of rubber and non-reactive additives in a ram mixer. In a subsequent step the base mixture is removed from the ram mixer and formed to a strand. The strand is cooled to a temperature at which the strand is still warm. The warm strand is then fed to a ramless mixer and reactive additives are added. In a batchwise operation the base mixture and the reactive additives are mixed at a second temperature that is lower than the first temperature in order to form a finished rubber mixture. Preferably, cooling and feeding of the strand are performed simultaneously.

Abstract: In a serial two-stage extruder, the first-stage extruder has a screw including a feed screw section having a length within a range of 5 to 9 the major diameter thereof, a mixing screw section having a hexagonal cross section and a pitch of 1 to 3 times the major diameter thereof, and a metering screw section having a screw groove of an appropriate depth. The second-stage extruder includes an extruding screw and a barrel. The extruding screw has a screw groove of an appropriate depth and a dulmage formed at the tip end of the screw. The dulmage has a plurality of fins cooperating with fins of the barrel. Alteratively, in the second-stage extruder, the dulmage may have a plurality of axially spaced stages of fins. Configurations of the fins in each respective stage are identical but various characteristics of the fins vary from stage to stage. In this case, the barrel does not have fins.

Abstract: A noodle machine has a housing with an upper opening, a receptacle deposited in the housing for receiving flour and water for making dough for noodles by stirring them by rotation of a stirring shaft positioned horizontally in the receptacle and rotated by a motor. A front cap with a center cylindrical portion for a screw portion of the stirring shaft fits therein to squeeze out dough to go out through a sieve with holes fixed at the front of the cylindrical portion to become noodles. And a shutter hangs at a notch at an upper side edge of the receptacle for closing an opening of a U-shaped plate of the front cap for hampering dough from moving into the screw portion and removed to let dough move through the opening of the U-shaped plate to be squeezed out of the sieve to become noodles by rotation of the screw portion.

Abstract: An apparatus for preparing food paste is provided. The apparatus includes a container for holding paste ingredients, a mixing and kneading assembly for preparing the food paste within the container, and an extrusion system for pressing the paste into a desired noodle shape. The mixing and kneading assembly comprises a plurality of mixing blades attached to a centrally located cylinder within the container. The assembly further includes a kneading blade and scraper blade. The scraper blade is fixed at a constant distance from the bottom wall of the container such that paste is scraped from to the bottom wall as the scraper blade is spun. The kneading blade has leading and trail edges that remain parallel to the bottom wall of the container. The mixing blades and kneading blade are reciprocated in a vertical direction and are biased by a biasing means toward the bottom wall of the container. A drive means rotates a spindle which in turn spins the mixing and kneading assembly.

Abstract: In a serial two-stage extruder, the first-stage extruder has a screw including a feed screw section having a length within a range of 5 to 9 the major diameter thereof, a mixing screw section having a hexagonal cross section and a pitch of 1 to 3 times the major diameter thereof, and a metering screw section having a screw groove of an appropriate depth. The second-stage extruder includes an extruding screw and a barrel. The extruding screw has a screw groove of an appropriate depth and a dulmage formed at the tip end of the screw. The dulmage has a plurality of fins cooperating with fins of the barrel. Alteratively, in the second-stage extruder, the dulmage may have a plurality of axially spaced stages of fins. Configurations of the fins in each respective stage are identical but various characteristics of the fins vary from stage to stage. In this case, the barrel does not have fins.

Abstract: A noodle forming device includes a dough mixing chamber and an extruding chamber connected to each other, a mixing shaft having mixing blades fixed thereon extending through the mixing chamber, an extruding screw disposed within the extruding chamber and connected to the mixing shaft in such a way to be rotatable about the same rotational axis in unison therewith to extrude mixed dough out of the noodle forming device through an extruding die to form the noodles. A partition plate is removably disposed between the mixing chamber and the extruding chamber to prevent the dough ingredients from entering the extruding chamber before well mixed. Once the dough is well mixed, the partition plate is removed to allow the dough to be expelled into the extruding chamber to be extruded out of the extruding die.

Abstract: Process for producing from a rubber mixture blanks for finished parts in the rubber industry is composed of an extruder having a cylinder and a screw rotatable in the cylinder to plasticize a rubber mixture fed into the cylinder, an extrusion head and a gear pump between the extruder and the extrusion head for producing extrusion pressure and forcing the mixture through the extrusion head at a predetermined rate per unit time to form a uniform strand of predetermined shape which is cut into uniform lengths.

Abstract: A continuous flow method for processing soap involving providing soap heated to a pliable consistency, mixing the soap to homogeneity, cooling the soap, and extruding the soap is provided. Also provided is a processing system. One embodiment includes a device for heating the soap, a continuous mixer and a continuous heat exchanger connected via conduits. The conduits continuous mixer and heat exchanger may be adapted to be further inputted with additional ingredients, such as a gas. Using this method and system, low cost, high volume processing of soap is possible.

Abstract: A rotary channel pump apparatus for compressing solids that have an initial bulk density which is substantially lower than their structural density; the apparatus comprises a flow channel having an inlet and an outlet and includes: (i) an annular drag flow channel segment (L1) formed between a stationary outer wall member and a rotating circular inner wall member; and (ii) a straight channel segment (L2) formed between a first planar and stationary wall portion and a second planar and stationary wall portion; no axial cross-section of the flow channel between the inlet and the outlet is smaller than the axial cross-section at the inlet; a rotary feeder is connected to the flow channel near the inlet thereof for precompacting the particulate solid which is then passed through the flow channel to substantially increase the bulk density and to avoid melting and/or thermal degradation of the particulate solid when passing through the flow channel.

Abstract: In the preparation and production of plastic materials by a continuously operating double shaft screw-type extruder, the efficiency of production often depends on good delivery of material to the extruder. In accordance with the invention for processing various types of plastic materials, a primary stage is mounted in a pressure-tight sealed manner on the housing of the extruder, the primary stage being formed by a vertical double conical container in which a pair of screw-type helices are rotatably supported and driven from above. The helices are connected to two replaceable feed elements at their lower ends so that delivery of material to the extruder is achieved without any intermediate dead spaces.

Abstract: An extrusion head for sheathing elongate objects such as cables has a housing with an elongate bore in which there is a hollow mandrel through which is passed the object to be sheathed. At the discharge end of the mandrel there is a forming tool made up of an annular forming tool part on the mandrel and a concentric forming tool part at the adjacent end of the bore of the housing. An extruder connected to the extrusion head housing forces sheathing material into the bore of the housing and out through the forming tool to form a sheath on the cable or other object as it is passed through the hollow mandrel. A rotor which is rotatable on the mandrel has a screw thread web of decreasing height for propelling sheathing material toward the forming tool. There are lubricated radial seals between the rotor, mandrel and housing. For applying a double layer sheath, there are two entrusion heads interconnected one behind another and supplied with sheathing material by two extruders.

Abstract: An extrusion apparatus having a rotor member rotatable within a barrel member longitudinal and cross-sectionally mixes and extrudes thermo-plastic and thermo-setting materials. The apparatus is articulated into sections including a barrel entrance and forcing section, a blending section, and an end discharge section. The barrel entrance and forcing section consists of helical extrusion grooves which terminate at an abrupt rotor to barrel and barrel to rotor material transfers. The blending section recognizes that blending is volumetric i.e. three-dimensional and therefore longitudinal displacement of the material in relation to itself is one of the dimensions. Longitudinal displacement is accomplished in the blending section by providing a double extrusion capacity main extrusion rotor and a single capacity backfeed rotor arranged to recirculate half of the material processed by the main stream rotor.

Abstract: Material such as chewing gum is treated to reduce its density by working it and feeding it through a twin-screw corotating extruder configured to provide flow at first and second longitudinal rates, pulling in a plane normal to the axis of flow, and further working and homogenization.

Abstract: A mixing and processing apparatus for plastic melt is equipped with a separately drivable gear pump as a delivery unit. In order to avoid material deposits between the mixing and processing apparatus and the delivery pump, the gear pump is directly mounted at the outlet end of the mixing and processing apparatus, such as an extruder, so that the plastic melt is directly fed axially into the suction space of the gear pump. Cleaning operations after shutdown or in the case of change of material are eliminated due to this direct transfer without dead space.

Abstract: A process and apparatus for the production of a polymer of thermoplastic polycondensate in which the polymer is first treated in a screw extruder and then in a mixing tank. In the extruder the polycondensate is heated in a first zone to a temperature below its melting point and thereafter it is heated to a temperature above its melting point at a vacuum. Water and other volatile components are removed from the first and second zones of the extruder. In the mixing tank the polymer is maintained under vacuum conditions and is conveyed and mixed by spiral mixing blades to remove residual water and volatile components. The polymer is discharged at the bottom of the mixing tank by a melt pump after a residence time of between 5 and 60 minutes in the mixing tank.

Abstract: Apparatus for extruding plastic and/or rubber material has a screw extruder, which plasticizes the material and delivers it to a gear pump which develops sufficient pressure for extrusion of the material through an extrusion head. The apparatus is characterized by the fact that the axes of gears of the gear pump and the axis of the screw of the extruder are parallel to one another. The housing of the gear pump has a side opening into which a cylindrical bushing and the screw of the extruder extend so that the material is delivered by the extruder directly to the gear pump as a non-oriented plasticized mass. The extrusion head may be a transverse extrusion head with an axis parallel to the axes of the gear wheels of the gear pump and the axis of the screw of the extruder. A second like extrusion apparatus including a screw extruder and a gear pump may be connected to an opposite side of the extrusion head.

Abstract: Equipment for briqueting plant stalk-produce, includes a conical-screw compactor, a tubular press-cavity, an annular degassing device and a control device including a molding pressure sensor. The annular degassing device adjoins a discharge aperture of a compactor space with a plurality of narrow-axial degassing slits open to the atmosphere, which issue into the discharge aperture of the compactor space.

Abstract: A method of preparing a magnetic coating composition comprises a first process for kneading ferromagnetic grains, a binder and a binder solution Y1 by use of a two-shaft continuous kneading and mixing machine to obtain a kneaded mixture K1 having a solid content within the range of 65 wt % to 95 wt %, a second process for kneading a binder solution Y2 and the kneaded mixture K1 by use of the two-shaft continuous kneading and mixing machine to obtain a primary diluted mixture K2 having a solid content within the range of 50 wt % to 70 wt %, a third process for diluting and dispersing the primary diluted mixture K2 in an organic solvent to obtain a secondary diluted mixture K3 having a solid content within the range of 25 wt % to 50 wt %, and a fourth process for finely dispersing the secondary diluted mixture K3 to obtain a dispersion mixture K4 having a solid content within the range of 25 wt % to 45 wt %.

Abstract: Recycling polyolefin material, e.g. biaxially oriented polypropylene film, coated with a chlorine-containing polymer, such as polyvinylidene chloride homopolymer and/or copolymer, and having a primer therebetween. First, a caustic solution is formulated containing from about 0.1 wt. % to about 50 wt. % caustic, and from about 0.05 wt. % to about 1.0 wt. % of a wetting agent. The formulated caustic solution is heated to a temperature from about 25.degree. C. to about 140.degree. C. The polyolefin material is soaked in the heated caustic solution until the material is separable from the chlorine-containing polymer. After separating the polyolefin material from the chlorine-containing polymer, the material is reprocessed into desired product by extrusion, molding or other product forming process.

Abstract: A method is disclosed for the production of extruded plastic products by using an extruder (1) which has an extruder hopper (2) which is supplied with a hot mixture obtained by discontinuous mixing of PVC powder and aditives in a hot mixing zone, with the supply of frictional heat, wherein a first amount of PVC powder is mixed with an excess of additives with the supply of frictional heat, after which the mixture thus obtained is homogenised in the same mixing zone with a supplementary amount of PVC powder, in such a way that the final mixture has the desired concentration of additives, after which the hot mixture obtained after homogenisation is fed directly to the extruder hopper (2). An installation for the production of plastic products by extrusion, comprising a discontinuously operating hot mixer is also disclosed, as well as said hot mixer (3).

Abstract: A machine for molding a starting crystalline saturated polyester resin such as polyethylene terephthalate includes a device for first drying and then preheating the starting resin to a temperature above its melting point to lower the viscosity of the resin to such an extent that the resin is not substantially degraded in the compression section of the molding machine. A feed section is provided for quantitatively feeding the molten starting resin to the main body of the molding machine. Accordingly, the starting resin is molded into a desired shape in a molding machine under conditions such that the crystallization temperature of the resulting molded article is within 20.degree. C. of the crystallization temperature of the starting saturated crystalline polyester resin.

Abstract: The process is used to remove the solvent from an elastomeric polymer solution containing at least 8% by weight of elastomeric polymer. The elastomeric polymer solution undergoes a preprocessing step in order to remove a large part of the solvent. Thereafter, the elastomeric polymer solution is fed into a main extruder in order to remove the remaining solvent. The preprocessing step includes: (a) introducing a heating fluid and the elastomeric polymer solution into a static mixer in order to mix the heating fluid and the elastomeric polymer solution and heat rapidly the elastomeric polymer solution to a temperature of 60.degree.-250.degree. C.

Abstract: The invention relates to an apparatus for producing monodisperse powdered rubber and includes an extruder and individual conveying, grinding and discharge sections with respective cooling units corresponding thereto. The cooling units are arranged outside of the extruder and receive the grinding stock after each grinding process in order to cool and transport the stock to the feed opening of the following conveying, grinding and discharge section of the extruder.

Abstract: A compact and precision extrusion system for extruding strips of rubber compounds with profiles of accurate dimensions. Strips of rubber compound are uniformly heated and mixed in an extruder and then passed through a low pressure drop strainer to remove foreign matter. The strained compound then is fed directly into a gear pump which delivers precise volumes of the rubber compound immediately into the spread chamber of an extrusion head after which it passes through a die to form a precise strip of the rubber compound. The strainer and extrusion head are movably mounted with respect to the gear pump for axial separation from the gear pump for easy removal of the rubber compound from the various components of the system to facilitate compound changes. A control system regulates the speed of the extruder to provide a near constant pressure at the entrance port of the gear pump to precisely regulate the rate of extrusion of the compound from the extrusion head.

Abstract: A machine for manufacturing thermoplastic polymers including a plurality of coaxial components adjacent to and made integral with one another, the components forming a longitudinal chamber receiving a pair of interacting shafts having portions correspondingly differentiated to provide sections for feeding and premixing the compound, thus forming a single assembly with coaxial components capable for carrying out full processing of the compound from the raw material to extrusion, without discontinuity of sequence.

Abstract: Fibrous network structures are produced within liquid polymer resins by passing the fiber-containing resin along a channel having a plurality of sets of flow modifying elements which establish a regulated succession of velocity profiles for the principal flow direction and the two directions perpendicular thereto. The individual velocity profiles persist over distances which are small compared to the channel dimension over which they are established and are such that there is substantially no net deviation from the principal flow direction. The velocity profiles superimpose on each other to cause rotation and sliding of the fibers so that a coherent network structure is built up which persists through extrusion dies and molds into the solid state. By means of a large number of touches per fiber the structures thereby established confer efficient mechanical reinforcing properties and enhanced thermal properties on the polymer composition.

Abstract: In a plasticizing assembly for use in an injection molding machine, which assembly has a high-pressure chamber and a low-pressure chamber, which contains the feed screw, and a plurality of fixing screws disposed on a circular line, a connecting sleeve is provided, which partly surrounds the plasticizing cylinder or a rear section of a bipartite plasticizing cylinder and surrounds also the nozzle body or a forward section of a bipartite plasticizing cylinder in part of its length and is secured to the plasticizing cylinder or to its rear section. The fixing screws are screwed in and axially supported in tapped bores of the connecting sleeve and at their end faces bear on abutment faces of the nozzle body or of the forward section of the plasticizing cylinder.

Abstract: A highly viscous or dough-like material, especially glass fiber-filled polyester, polyamide or polypropylene is fed from a rotating funnel via a feed worm lying along a generatrix of the funnel directly into an extruder or an injection molding cylinder and without passing through an elbow or other jacket. The system is thereby able to operate at reduced pressure with least damage to the fibers and reduced drive energy for the feed worm or screw.

Abstract: A synthetic-resin article is molded by plastifying a virgin granulate into a fluent stream and plastifying a recycle granulate into another fluent stream. The recycle stream is then filtered while still plastified to removing particulate impurities from it. Then the filtered recycle stream while still plastified is combined with the virgin stream to form a combined stream and the combined stream is fed into a mold. The stream is mechanically filtered.

Abstract: The present invention relates to a method and apparatus for forming an extruded plastic lumbar product from a commingled plastic waste feed stock. The apparatus generally includes an extruder portion and a forming portion. The extruder portion includes a compound extruder which compresses and melts the waste product by a sudden transition within a constant pitch conveyor. From the compound extruder, the melt is introduced into a hot melt extruder which is formed so as to prevent vortex of the melt or mixing of the different resins. The hot melt conveyor includes a diminishing pitch along its length and a short transition section and metering section. The hot melt is then formed into a desired profile through a cross-head die in which a series of rovings are introduced into the melt. The rovings serve as a reinforcement for the extruded product as well as define the extruded profile feed rate.

Abstract: In a process for the manufacture of thick, preferably sheet-shaped, thermoplastic molded parts or molded parts having areas of variable cross sections, at least one part of the plastic material is conveyed as a melt into a heatable and optionally coolable compression mold and is subsequently compressed. Plastic granules are mixed in with the melt before the melt is conveyed into a compression mold. A device to prepare such mixture of melt and plastic granules includes a first section designed as a melt extruder and a subsequent section designed as a mixing extruder. The granules can be fed into the melt between both extruder sections or into the second section.

Abstract: The present invention provides an extruder for highly foamed plastic material for coating a central conductor of a coaxial insulated cable with an insulator made of a mixture of a plastic material, preferably polyethylene, and an inert gas, such as nitrogen gas, to serve as a foaming agent. An inert gas is introduced approximately halfway down the extruder through a lead-in portion. At the lead-in portion of the extruder is a vent portion wherein the screw is provided with a plurality of stirring blades extending radially from the screw toward the inner surface of the extruder. These stirring blades provide a mechanism by which the inert gas is mixed thoroughly into the plastic material. The above invention provides an apparatus for producing an insulating material in which an inert gas (such as nitrogen), rather than hydrocarbon chloride fluoride, is used as a foaming agent, thus avoiding potential harm to the ozone layer.

Abstract: The specification is concerned with a process and apparatus for continuous manufacture of moisture curable silicone compositions.

Abstract: A process and an apparatus for optimal operation of a high-speed extruder in which a pin-lined barrel section and a Transfermix section, both known per se but separately used, are utilized together in an extruder. The combination of these mixing systems allows in a surprising way an increase in the material throughput of 60% to 100%, with the mixing quality remaining the same and the drive torque being halved. The static extrudate pressure can be further increased by arranging an adjustable restriction device downstream of the extruder screw, thereby permitting a further increase in the output rate.

Abstract: An apparatus for mixing, plasticizing, reacting and extruding ingredients combines a mixing unit for mixing powder-form ingredients and liquid ingredients into a paste-like mixture, a kneading and heating unit for plasticizing the mixture, a heating tube for reacting the plasticized mixture, and an extrusion die opening into a chamber which is maintained under reduced pressure by a pump. Pressure for propelling the plasticized mixture may be provided by a positive pump or by closely spaced flights of a screw extruder positioned before the heating tube.

Abstract: A process for continuously producing a heat-vulcanizable silicone rubber compound, which includes the steps of:(i) mixing (A) a diorganopolysiloxane having a viscosity as measured at 25.degree. C. of 1.times.10.sup.5 cP or more, (B) an inorganic filler and (C) a processing aid, as basic ingredients, by a high-speed mechanical shearing machine, thereby to obtain a flowable particulate mixture in which each ingredient is present in a substantially uniformly and finely dispersed state, and(ii) continuously feeding, at a constant feed rate, said particulate mixture to a continuously kneading and extruding machine through a feed opening thereof, which machine has two screws rotating in the same direction, thereby to obtain a homogeneous silicone rubber compound from a discharge opening of said kneading and extruding machine.

Abstract: Multiple extruder apparatus for compounding thermoplastic resin and reinforcing fibers incorporates a resin extruder in which thermoplastic resin pellets are melted and a compounding extruder in which the molten thermoplastic resin is mixed in intimate contact with long reinforcing fibers of at least one inch in length. The melted thermoplastic resin is introduced into the compounding extruder at a point downstream of the inlet point for the reinforcing fibers, so that the fibers are mechanically worked and heated before coming into contact with heated, molten thermoplastic resin. The extrudate from the compounding extruder consists of a homogeneous, molten mass of thermoplastic resin having discrete lengths of fibers randomly dispersed therein. This hot mixture may be fed directly into preform-making equipment to produce a measured preform of desired size, weight, and shape. The preform may then be fed directly into a compression molding machine.

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: Multiple extruder apparatus for compounding thermoplastic resin and reinforcing fibers incorporates a resin extruder in which thermoplastic resin pellets are melted and a compounding extruder in which the molten thermoplastic resin is mixed in intimate contact with long reinforcing fibers of at least one inch in length. The melted thermoplastic resin is introduced into the compounding extruder at a point downstream of the inlet point for the reinforcing fibers, so that the fibers are mechanically worked and heated before coming into contact with heated, molten thermoplastic resin.The extrudate from the compounding extruder consists of a homogeneous, molten mass of thermoplastic resin having discrete lengths of fibers randomly dispersed therein.

Abstract: A pin transfer extruder is provided, wherein the pin-barrel and transfer mixing sections, which are known per se and have only been used individually hitherto, are jointly used in one extruder. Throttle pins, which are disposed in the transfer mixing section in the region of the greatest housing thread volume, permit universal use of the extruder in respect of the extruded material. The combination of both mixing systems permits the throughput of material to be increased in a surprising manner by 60% to 100%, while a constant mixing quality is maintained and the driving torque is halved. The number of the housing and screw flights remains independent of the cross-sectional area of the housing and screw threads because the number of housing and screw threads is constant.