Abstract: A process and apparatus for injection molding of plastic material incorporate a perforated member for melt filtering and/or melt mixing during metering of plasticized material. The perforated member may be of a disk form mounted to a screw plunger provided within a machine body with the perforations arranged around the screw plunger. Impurities accumulated at the perforated member may be purged by rotating the screw plunger from a nozzle connected to the machine body via an annular recess formed at an inner surface of the machine body or directly from the machine body per se via a radial hole formed therein, when the screw plunger is in a predetermined position preferably in the most forward position, where the recess or the hole is located in the vicinity of the perforated member.

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: An apparatus and system is disclosed for extruding commodities such as rice bran and which includes symmetrically disposed beater bar segments on the extruder rotor that will simultaneously impact symmetrically positioned knives mounted within the extruder housing. The apparatus preferably includes a sufficient number of knives and beater bars that impacts occur more than once each ninety degrees of rotation and at substantially equal degrees of rotation from each other. The device includes a widened and lengthened extrusion gap with variable width, a generally solid extrusion rotor, and a control system for adjusting the cooking temperature by varying the width of the extrusion gap. The extruder is fed using a drag conveyor with angled blades which push the rice bran into the extruder housing.

Abstract: An improvement in the method for extruding ethylene polymers which are extruded through an extruder apparatus including an extruder screw having a screw root and a series of flights having a leading edge and a trailing edge. The extruder apparatus also has an inlet end and a discharge end and wherein the pitch ratio divided by the depth ratio is greater than 2/3. The improvement provides a metallic coating selected from the group such as nickel coating or a matte chrome finish on the screw root and the leading and trailing edges of the flights, the coating being present in an amount sufficient to increase the output of the extruder screw.

Abstract: A resin extruder in which the degree-of-kneading of the resin can be effectively controlled. The invention can be applied to both a single-screw extruder and a twin-screw extruder. In either case, blocking walls are formed around a cylindrical portion of the screw or screws just upstream of the kneading section. A valve structure is provided in the walls to control the kneading of resin at the kneading section.

Abstract: An electrostatic latent image developing assembly having a first feed passage for feeding developing material in a first direction, a second feed passage for feeding the developing material in a direction opposite to the first direction. A helical feed screw in the first feed passage, a helical supply screw in the second feed passsage for supplying part of the developing material to a developing sleeve, a connection between both sets of adjacent ends of such feed passages for permitting the developing material to circulate between the passages, wherein the feed screw and supply screw are disposed in parallel relation and the supply screw is provided with buckets around its periphery, the supply screw having a helical blade for advancing developing material in the second feed passage axially thereof while the buckets move the material circumferentially. Preferably, the radius of the helical blade reaches to at least one-half the depth of the buckets.

Abstract: A stainless steel tank has an inlet for food products such as pasta and a discharge end where the food product is discharged. A perforated cylinder is mounted to rotate within the tank and an auger is positioned within the cylinder to advance food product from the inlet to the discharge of the tank. The auger is fitted with a plurality of lifting baffles to extend radially inwardly from the cylinder between two adjacent flights of the auger to carry food products sidewardly and lift the food product out of water contained within the tank and allow the food product to tumble back into the water. Two manifolds extend into the tank beneath the perforated cylinder and have a plurality of apertures. A controller controls a supply of steam and a supply of pressurized air to selectively introduce steam and compressed air through the manifold apertures into the tank.

Abstract: An extrusion apparatus is provided for the mixing and extrusion of thermo-plastic and thermo-setting materials and the pelletizing of thermo-set materials, in which a rotor member is rotatable within a barrel member. The apparatus is articulated into three sections including a barrel entrance section, a forcing section and a metering section. Each section is provided with helical rotor extrusion grooves, and is followed by a circumferential barrier and a rotor to barrel to rotor transfer zone. The circumferential barrier is provided with a clearance, barrier top to barrel bore, designed to pass fluent material and retarding the over-size and less fluent material. The leading edge of the circumferential barrier is provided with multiple dual purpose plows which, direct the fluent material down-stream and the over-size and less fluent material up-stream for additional working.

Abstract: A single-state apparatus for injection molding structural foam articles has a resin plasticating barrel in which a cylindrical plunger reciprocates and rotates. The plunger has a screw section for plasticating resin and advancing the plasticate into a metering section with grooves in which plasticate flows. The grooves are contiguous to a fluid foaming agent inlet in the side of the barrel so that they alternately open and close the inlet to introduce fluid foaming agent periodically into the plasticate. Downstream, the plunger has channels for mixing and advancing plasticate to the forward end of the plunger where it accumulates and is periodically rammed by the plunger into the mold.

Abstract: An extruder assembly for composite materials, the extruder assembly having a barrrel with feed and compression sections, a rotatable screw adapted to convey a composite material through the barrel, at least one fiber alignment means, and a die. The screw diameter in the feed section is approximately twice the screw diameter in the compression section, and the flight spacing in the feed section is approximately twice the flight spacing in the compression section.

Abstract: An extrusion machine includes a barrel or cylinder which houses an extrusion screw. The screw includes a feed section into which powder material is fed. The material is then fed into a mixing section, then through a transition section and then to another mixing section and finally to a section for mixing and metering the material as it is fed to the die. The extrusion screw in each of the mixing sections includes a double flight for causing the material to move back and forth in each section as it is fed to the discharge end of the barrel. The mix and meter section also includes keys to further mix the material.

Abstract: In a hydraulic screw pump, a sealing element for the peripheral edge of the rotary screw. The sealing element is formed with a channel along its length to fit over this edge of the rotary screw. The channel may be varied in depth to adjust the gap between the rotary screw and a water-carrying trough for the pump. The width of the channel may also be adjusted to accommodate rotary screws of varying thicknesses. The sealing element, thus, retains the desired width of the gap even though the edges of the rotary screw are chipped or worn away.

Abstract: An improved apparatus for varying the pressure within a screw channel which apparatus includes a shaft having a helical flight defining a channel between consecutive turns of the flight. The screw is rotatable within a barrel. A radially movable first member is disposed at a right angle to a longitudinal axis of the screw where the plasticated material has undergone partial melting. A reciprocatively movable second member is disposed within a bore through the shaft coaxial with the axis and includes a cam slidably engaged with an inner end of the first member such that the first member can be extended into the screw channel when the second member is moved in one direction and retracted from the channel when the second member is moved in another direction. At an upstream end of the second member there is provided a rotatable thrust transmitting coupling which allows rotation of the second member relative to a male threaded portion secured to the coupling and coaxial with the second member.

Abstract: An improved extrusion structure and techniques for obtaining very high extrusion speeds based upon the use of higher extrusion temperatures and resulting increase in critical extrusion rates. Structure is provided for eliminating back flow of the extrudate, for continuously mixing the extrudate just prior to entering the extruding die, and for controlling the temperature of the extrudate at critical locations along the path of flow.

Abstract: A twin screw extruder with a material homogenizing unit is the subject of this disclosure. Two extruder screws are located within a housing positioned and configured so that screw turns and screw lands of a first screw mesh with respective screw lands and screw turns of a second screw. A homogenizing zone housing is connected to the dual cylinder housing. Two cell rotors are connected to respective extruder screws and are located within the homogenizing zone housing. A plurality of radially distributed cell walls may be disposed on each cell rotor defining a plurality of open conveyor cells where the cell rotors and cell walls of each rotor are configured to mesh a cell wall with an opposing conveyor cell. The cell walls may be arranged with a slope differing from a slope of the extruder screws. The cell walls may be arranged parallel to or at an angle to an axis of said cell rotors.

Abstract: An extruder screw and a method for extrusion to achieve high output rates with thermally sensitive plastic materials and without thermal degradation problems involving the use of a single flight metering type extruder screw having an initial feed zone, distal metering zone, and a transition zone interconnecting the feed and metering zones. In particular, improvements in the extrusion of thermally sensitive plastics such as PVC are achieved through use of a compression ratio of approximately 2:1, a constant lead and pitch, and a proportioning of the length of the feed zone, transition zone, and metering zone relative to the total length of the zones of 27-33%, 23-25%, and 45-48%, respectively. To achieve cooler and more uniform mixing with rigid PVC, polyethylene and like materials, an improved arrangement for using rings of mixing pins is provided.

Abstract: The apparatus is for the extrusion of thermoplastic and rubber-like materials, more particularly an apparatus which has a feed means or hopper adapted for hot or cold feed of the selected materials. The apparatus has an extruder screw-type forcing zone followed by a straining refining zone, a straining means adjustable to the acceptable particle size and arranged to refine agglomerates to the acceptable particle size, and numerous circumferential grooves which inherently develop the fast forward flow of the fluent phase material and is arranged to place the developed fluent phase material at the entrances to the straining or refining openings. The apparatus has an adequate straining opening length to provide for full extrusion capacity; intensively shears and leads off all of the process material, crossing the tooth top once only thereby achieving uniformity of processing.

Abstract: A plasticating extruder screw incorporates two or more screw configurations into a single screw. This is accomplished with two or more parallel channels in which each channel is designed to a different set of materials and performance requirements reflecting the range of the materials to be processed. The extrusion screw in fact represents two or more screws in a single screw in which each performs its function independently of the other. Thus, each channel in this screw differs from the others in critical design parameters such as compression ratio, length and depth of its feed, transition and metering zones. This multiconfigurational design feature may occupy part or the entire length of the extruder as dictated by the specific characteristics of the materials to be processed. A mixing and stabilization zone placed at or near the entrance of the metering zone of the screw provides for melt flow interaction and equilibration between channels.

Abstract: An extruder for processing wood particles, shavings or sawdust is particularly useful for the production of a refined product exhibiting a large number of separated, individual fibers each of a relatively long length as is desirable in the production of a fiber core for a composite particle board. The extrusion apparatus comprises an elongated barrel and a flighted screw rotatable within the barrel, with the final downstream section of the screw being of a configuration to sequentially present three processing zones each having a compression region, a restricted region and a decompression region. The three processing zones of the final screw section cooperate with a compression region and restricted region formed in the final head section to choke the advancement of wood materials through the extruder sufficiently to enable satisfactory processing of the same without the use of a final die or restricted orifice disposed on the outlet of the extruder barrel.

Abstract: A novel plastic extruder is taught which employs a compound feed screw having both a flights' section, and a wiper section adjacent thereto. The compound feed screw is positioned in a jacketed extruder barrel through which a foam plastic melt is propelled and cooled by means of a coolant circulated through the jacket, or other cooling means, prior to being forced through a die to form a cellular plastic sheet. The flights' section of the feed comprises a helical spiral ridge machined on a rotatable shaft, while the wiper section comprises a plurality of wiper blade assemblies mounted longitudinally on pairs of spaced apart, raised circular ridges, machined on the shaft, adjacent wiper blade assemblies being mounted radially displaced relative to each other.

Abstract: The apparatus is for the continuous mixing of rubber like polymers with chemical additives to form a homogeneous compound, using minimum unproductive work, such as mixing already mixed material, or massive batch blending to correct lean and rich mixtures previously produced. The apparatus consists of a feeding means adapted to continuously and uniformly advance baled polymer into a machine hopper provided with a multi-purpose rotor, adapted to cut the advancing bale into shreds, in the presence of the chemical additives, mix the shredded polymer with the chemical additives and advance the resulting compound into a continuous mixing means. Mixing with minimum waste motion is expected to produce a superior compound not possible to obtain with present day production equipment.

Abstract: A plasticating screw having a mixing section comprised of two flow channels separated by barrier flights having axially spaced undercut sections and areas of compression and decompression in each channel. Inhomogeneities in the material being plasticated are distributed in both the forward and back directions by means of pressure driven cross-flows caused when the material encounters a section of a channel having a decreasing depth adjacent an undercut section of the barrier flight.

Abstract: Extrusion machine and process, the machine having a barrel having a feed section for receiving solid extrusion material, and containing a screw for moving the solid extrusion material through a solids conveying section to a compression section of the barrel to generate heat and pressure to melt the extrusion material and force the melt through a downstream extrusion die. The solids conveying section of the barrel has a cross-section comprising a plurality of flat or slightly curved surfaces which extend substantially tangentially relative to the extrusion screw circumference, providing axial recesses which restrain the rotation of the solid extrusion material with the screw as it is moved axially into the compression section. The present machine and process causes plastic extrusion composition to be packed as a non-rotating mass to fill the solids-conveying and compression sections and increase the dead head pressure and extrusion output of the machine.

Abstract: The present invention relates to a rotation screw for mixing, for use with an extruder for forming by forcing out a volume of synthetic resin or a mixture of synthetic resin with additives including glass or carbon fiber, calcium carbonate, etc, having a series of centrally situated mixing recesses of large width and a plurality of mixing recesses of small width arranged on both sides of said wide mixing recesses, both of which are helically formed, in specified mixing positions, in the periphery of the rotational screw, arranged in helically adjoined relationship, and partially communicated transversely of the helical direction with one another so that the amount of delivery becomes great and the highly intimate mixing can be effected.

Abstract: A rice bran extruder apparatus maintains a continuous flow of bran with appropriate heating to stabilize the bran to prevent information of free fat acid and rancid oil. A supply hopper includes a rotating paddle to stir the bulk bran for continuous gravity feed of the bran into a feed conveyor mounted immediately beneath the hopper. The feed conveyor is aligned with the bran extruder to supply bran to the inlet opening. The extruder includes a flighted rotor and terminates in a conical discharge nozzle. Extrusion of the bran results in heating of the bran to stabilize the lipase, destroy bacteria and produce a stable bran providing oil and an edible end product. The flighted rotor has closely spaced flighting and at least 12 agitator elements secured between the flights for at least the last four flights to establish a continuous movement of the powdery rice bran through the extruder and positively prevents blow back of the bran.

Abstract: A mixer for food products and the like in commercial quantities comprises a horizontally elongated body with a trough bottom in which rotates one or more horizontal drive shafts carrying an agitator in the form of a helical ribbon or worm of a radius matching that of the trough bottom. The ribbon supports a number of scraper units on it, each scraper unit including a scraper body having a broad face facing toward the trough bottom, the broad face terminating in two opposed relatively sharp edges. The scraper bodies are mounted for rocking movement so that the leading edge will be forced into scraping engagement with the trough bottom and will remain in engagement with the trough bottom even though the trough is wavy or uneven. Either of the edges of the scraper body can be the leading edge, depending on the direction of rotation of the agitator drive shaft. The vessel preferably is formed with a pair of arcuate troughs which have a circumferential arc of 180.degree.

Abstract: This invention relates to apparatus for continuously varying the pressure within a screw channel of a plasticating machine by way of a variable restriction in the screw channel. The apparatus includes a cylindrical barrel, a shaft rotatable within said barrel having a substantially circular cross-section and a longitudinal axis for rotation concentric with the barrel. The shaft is provided with a helical screw channel which is defined between successive turns of at least one helical flight integrally formed with the shaft. At least one radially movable first member is disposed at a right angle to said axis within the channel at a location along the axis and is located within the channel at a location along the axis at which the material being processed is substantially melted.

Abstract: An improved process and apparatus for producing a uniform organic-filler-blended resin composition from a mixed material of a thermoplastic resin and a coarse organic filler raw material such as waste paper by the use of a specified extruder, without the necessity of fine-grinding of the organic filler raw material prior to feeding it into the extruder are provided, which process and apparatus are characterized by providing many projections and grooves surrounding them on the surface of an intermediate part of the screw in the extruder and specifying the size of the gap between the outer surface of the screw part and the inner surface of the cylinder opposed thereto.

Abstract: There is provided a method and apparatus for the accurate volumetric feeding of materials which require agitation to induce flow, the apparatus includes a hopper for containing said materials including a lower horizontally disposed, cylindrically shaped trough portion, an adjustably feed opening for feeding said material from said hopper disposed at a first end of said lower trough portion, a feeder assembly comprising a plurality of radially extending material working tools circumferentially mounted at equal angular displacements along a rotatable shaft and a feed helix longitudinally mounted on said shaft. The feeder assembly is disposed longitudinally in the lower trough portion and the shaft thereof defines the center of said trough portion.

Abstract: A rotor element for use in extrusion and compounding machinery that incorporates means for mixing a low viscosity or immiscible additive with high viscosity base stocks such as polymer melts. The rotor incorporates a combination of one or more helical flights with an array of mixing pins arranged in the cylindrical screw root.

Abstract: Plasticating extruders in which increased melting effectiveness is attained through multiple stages including at least one inner screw conveyor within an outer screw conveyor in a barrel for receiving unmelted solid material from the channel of the outer screw conveyor and conveying the received unmelted solid material in the channel of the inner conveyor in a direction parallel to and axially coextensive with the direction of travel of the material in the channel of the outer screw conveyor and melting the received unmelted solid material to bring melted material to a downstream location where the melted material from both channels merges to deliver a flow of fully melted material to a downstream discharge outlet. A vent may be located in the barrel in the vicinity where material enters the channel of the inner screw conveyor for improved venting as a result of the diversion of material away from the vent.

Abstract: The double reverse helix agitator with an internal conveying screw is used in a gas phase olefin polymerization reactor having at least one polymerization section and has helical flights defined by helical blades which are mounted to a shaft, which extend in opposite axial directions and which have approximately the same radius from the axis of rotation of the agitator. The shaft has a spiral screw thread thereon for conveying polymer particles axially by the agitator through a reactor vessel.

Abstract: The invention provides a screw conveyer which has a helically wound member (23) attached to the screw which member extends from each turn of the screw towards the next turn and is of decreasing diameter along the screw.

Abstract: A process for regulating the mixing process of rubber mixtures utilizes an internal or closed mixer having a casing containing two paddles with feed and mixing blades mounted on shafts which extend with parallel axes through a mixing chamber. The shafts are arranged to be driven in opposite directions at variable speeds and the mixer is provided with a pressure-operable plunger for closing the mixing chamber. The temperature of the mixing process is controlled with the aid of a thermometer probe and the mixing sequence is controlled on the basis of energy marks and a superimposed desired/actual value follower control of the mixing temperature via the specific energy supplied to the mixture in the mixing chamber, the speed at which the shafts and hence the paddles are driven and/or the pressure applied by the plunger serving as variables for the temperature control.

Abstract: This invention is directed to an apparatus and method for melting and conveying plasticated material. The invention includes a screw conveyer which has a shaft with one or more helical flights rotating in the bore of the barrel of an extruder. At a location in the screw channel after which the melted material will be dispersed into the remaining solids bed, there is provided a groove in the shaft of the screw through which the semi-melted or agglomerated material is diverted by a protrusion which extends across the channel of the screw to the groove. The additional heat transferred to the material resulting from the enhanced distribution of melted and solid material which occurs as the semi-melted material is diverted through the groove and back into the screw channel improves the quality of the processed material.

Abstract: Method for the forming of thermoplastic and/or elastomeric resins, in which method use is made of a melt torpedo in the melting zone of a processing machine having a screw. The torpedo has grooves and ridges with a helix angle of preferably between 55.degree. and 75.degree.. The final melt temperature, that is the temperature at the beginning of the outlet of the processing machine is chosen lower than that applied in the same processing machine without a torpedo.

Abstract: This invention pertains to a field of the art for producing crude oil from rice bran, and it relates to a pretreatment method for extracting crude oil from rice bran and an apparatus used therefor.The object of this invention is to obtain an extremely high-quality and light-colored crude oil from rice bran while eliminating any risk of environmental pollution in the pretreatment process for the extraction. In order to accomplish this object, as the pretreatment for extracting crude oil from rice bran, said rice bran is compressed in a screw extruder to break the cells in said rice bran and mold it into a form suited for the extraction of crude oil.

Abstract: An insulating coating of extruded polymer material is formed around a moving conductor wire; the extruder includes a decompression zone effective to arrest shear degradation of the polymer such that the melt index of the insulating polymer on the insulated wire is not more than 50% of the melt index of the solid, particulate polymer material before extrusion; the extruder includes valve means and intense mixing means which ensure that the polymer melts in a controlled manner whereby a uniform extrudate is formed.

Abstract: Method and apparatus are disclosed for the low energy melting, extrusion and pumping of material comprising feeding, metering, melting and mixing of such materials in an extruder having a melter screw and subsequently passing the resultant extrudate, through breaker plate and adapter means, to and through a rotary gear pump and, in turn, to a die member.

Abstract: The invention concerns an extruder head for regulating the temperature of a flow of molten plastic containing a foaming agent. In the flow passage of the extruder head is arranged a mixer which is inductively heated and transfers heat to the plastic flow thereby regulating the temperature thereof during the passage through the extruder head.

Abstract: An internal mixing apparatus for mixing plastic materials, especially raw rubber, has a mixing chamber defined by substantially parallel cylindrical individual chambers. Each of these chambers holds a rotating shaft and the two shafts rotate in opposite directions. In one embodiment of the invention, the shafts have a cylindrical outer surface on which is disposed at least one principal conveying and mixing vane. The vanes on the two parallel shafts are disposed in mirror symmetry so that the ridges of the vanes roll off against one another with or without contact. The principal vanes terminate ahead of the end faces of the mixing chamber, thereby defining free passages permitting the transverse motion of the material to be mixed. Within these passages, the shafts carry scraping vanes for preventing the accumulation of stationary material.

Abstract: In order to improve the wear-resistance of highly stressed surfaces of a kneading disc in a helical extruding machine, the exposed tips of the kneading disc are provided with inserts of an extremely wear-resistant, hard material. In a variety of embodiments, the tips of the lenticular kneading disc are provided with bores and recesses for receiving the hard inserts. Advantageously, the recesses are cylindrical wells in which cylindrical inserts are soldered or cemented. The inserts may be made from hard metals or ceramics, for example tool steel or tungsten carbide or the like.

Abstract: An extruder machine for processing thermoplastic materials such as low density polyethylene, the extruder incorporating a body having a bore therethrough with a rotor or screw journalled therein. The rotor has several successive mixing and pumping sections. The mixing sections on the rotor are multiple flighted defining primary and secondary channels having their discharge and entrances respectively blocked or restricted by annular dam arrangements. The rotor includes a plurality of adjustable dams, arranged across the channels, permitting a variation in the degree of homogenization which may be performed upon the extrudite. The dams may be radially displaceable to vary the distance between the radially outer surface of the dam and the surface of the bore.

Abstract: Fittings for reducing cracking in soap bars including protrusions on the end flight on the worm or auger of a soap plodder to break up the glazed layer of soap formed by the wiping action of the end flight on the soap as it is discharged. The plodder is provided with a cone nozzle and fittings are provided for eliminating the spiral movement of the soap mass and forming a laminated bar by extrusion through aligned slots. The concept of the invention also includes the elimination of the central or the spongy mass of soap and the formation of a harder grain structure for the soap.

Abstract: A method and apparatus are provided for the extrusion of a thermoplastic material in modified form in which the thermoplastic material is introduced into the barrel of a screw extruder, and is heated and forced through the barrel: the material is passed through valve means which together with the temperature of the material is effective to produce a melt transition in the material at a predetermined point and to thoroughly mix the material; subsequently, the material is forced into a low pressure zone in the barrel where a modifying agent is introduced into the material; the resultant mass is forced out of the low pressure zone, and is passed through a mixing means effective to intensify the dispersion of the modifying agent in the mass, the mass is extruded and the extruded material collected.

Abstract: An improved screw-type extruder intended to increase the output obtainable from a machine of certain dimensions while maintaining a satisfactory quality of the material extruded. This result is obtained by providing in the homogenization zone a thread crossed by a multitude of narrow passages, and in the feed zone means for overfeeding the plasticizing zone. These overfeeding means may, for example, consist in providing in this zone a cylinder grooved longitudinally or spirally or a double-screw section producing a forced pushing of the material toward the plasticizing zone.

Abstract: The invention provides apparatus for the production of cellular thermoplastic material comprising an extruder having a hollow barrel, screw means mounted in said barrel to advance material therethrough, mixer head means mounted in said barrel and gaseous blowing agent inlet means positioned in said barrel near the upstream end of said mixer head means, said mixer head means having in the surface thereof a plurality of alternate land and groove means, said land means having close clearance with the internal walls of said barrel near the upstream end thereof in the region of said blowing agent inlet means and alternately spaced and close clearance with said walls in the mixing region downstream of said blowing agent inlet means.

Abstract: An annular extrusion die having a rotating shear ring which provides a pumping and shearing action on the plastic as it passes through the die annulus, and a method of forming annular extrusions.

Abstract: An extruder comprising a cylindrical extruder housing and an extruder screw extending inside the housing to define an intake section, a mixer section, and a discharge section, the screw having a basic flight which extends in an uninterrupted helix from the intake section, through a mixer section to the discharge section and the basic flight is of one diameter in the intake and discharge sections so as to be a running fit in the housing but have a diameter in the mixer section less than the one diameter so as to define in use a clearance fit in the housing and, in the mixer section, a flow advancer and diverter between appearances of the basic flight which over at least the greater part of its length is of the one diameter so as also to be a running fit in the housing so that material fed to the mixer section is caused, in the mixer section, to pass over the basic flight.

Abstract: A thermosetting resin injection molding machine and method wherein a shearing and kneading barrier is formed at one end portion closer to the injection nozzle of a screw device in a heating cylinder for imparting the shearing forces to and kneading the molding compound so that the molding compound may be sufficiently kneaded before injection and may be uniformly raised in temperature immediately before injection.