Abstract: A plasticating screw including a grating mixing section provided to enhance mixing of incompatible materials. The screw includes a mixing section including an inlet groove having a closed distal end, a discharge groove circumferentially spaced from the inlet groove, the discharge groove having a closed proximal end. Located between the inlet groove and the discharge groove is a land region is including at least one grating element that includes a plurality of grooves extending between the inlet groove and the discharge groove.

Abstract: An extrusion molding apparatus capable of improving the extrusion rate of the ceramic material without a major reconstruction of a drive system is disclosed. The extrusion molding apparatus comprises screw extruders (2, 3) including housings (29, 39) having screws (4, 5) built therein, wherein the ceramic material introduced into the housings (29, 39), respectively, is extruded by way of the forward end extrusion ports by rotating the screws (4, 5). The screws (4, 5) built in the screw extruders (2, 3), respectively, include pressure portions (41, 51) with the feed rate per revolution progressively decreased toward the forward end extrusion port, and extended portions (43, 53) with the feed rate per revolution progressively increased toward the forward end extrusion port.

Abstract: A twin-screw extrude having a novel fractional element has been invented that can provide different tip angles. The twin-screw extruder is suitable for processing thermo plastic, thermo set and other material. It has a barrel with two parallel intersecting bores, two sets of co-rotating fully intermeshed extruder elements that are linked to each other in non rotary manner forming continuous chain, each element operating in one of the bores and each screw being provided with multi lobbed elements that has special geometry.

Abstract: An air releasing check structure of a metal injecting machine has a seat rod installed between a rear seat of a feeding screw rod and the extruding head at a front end of the front section. A periphery of the seat rod is enclosed by a check toggle. If the material to be ejected has bubbles so that it is not extruded effectively, the bubbles will flow to the exhausting grooves of the check toggle. Then the bubbles are drained out. Thereby, the bubbles in the material are vented out so that the material becomes dense. When the material becomes dense with high tension, the pressure of material will be greater than the force for buckling the elastic toggles so that the elastic toggles expand. As a result, the elastic toggle will further isolate the exhausting groove. Thereby, the material moves forwards to be ejected from the extruding head.

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

Abstract: A single screw extruder comprises a mixer associated with the screw, and comprising a rotor driven by the screw and a stator, the rotor and the stator each carrying mutually facing interengaging rings of teeth whereby the material is urged outwardly from the screw along a first tortuous mixing path, and then returned inwardly to the screw along a second tortuous mixing path, with the teeth extending axially, or generally so, with respect to the longitudinal axis of the screw. The invention also includes a mixer comprising a cylindrical stator chamber having opposed, radially extending faces provided with axially projecting, radially spaced-apart rings made up of alternating teeth and ridges, a rotor rotatably fitted within the stator and provided on its opposite side faces with axially projecting, radially spaced-apart rings of alternating teeth and ridges with the rotor and stator rings interengaging with both radial and axial clearance so as to define a tortuous material flow path.

Abstract: The mixing element has a central hole for keying to the shaft of the screw and an outer profile which can be produced as a result of the removal of material from a circular element along at least one arc of its Outer portion by cutting performed by a point-like element rotating around a circle with a diameter equal to that of the circular element. The point-like element and the circular element rotate in the same direction and at the same speed and the centers of the circular element and of the circle are spaced apart by a distance less than their diameter. During a portion of the cutting process, the distance between the centers of the circular element and of the circle is reduced so that the portion of the outer profile which is correspondingly cut is recessed.

Abstract: Polyethyleneterephthalate extrusion equipment of material in granule form, still humid, coming from both ground recovered products and also virgin material, comprising a chassis (29), containing a co-rotating, oil-thermoregulated extruder with two screws (31, 32), which comprises a first zone (A), equipped with an opening (34) where there is an aspiration hood (35) for a first “open top” degassing, a second zone (C) where there is at least one stack (37, 38) for a further degassing, between the two zones (A, C), there being a tight zone (B), and a carrying and loading zone (E) activated by the screws (31, 32).

Abstract: A twin-screw continuous kneading apparatus is provided which can stably supply an additive without reducing the production capability and greatly increase the throughput of a high-quality compound. The kneading apparatus includes a second supply unit connected to an upstream end or a midstream portion of a barrel and supplying an additive into kneading chambers, and has a kneading zone provided by a part of each of kneading screws downstream of the second supply unit for mixing the additive into a kneaded material.

Abstract: An apparatus and a method for controlling a degree of attrition or wear of a sealing screw conveying plasticized material are provided. The apparatus includes an opening which intersects the wall of a housing of the screw in the region of the screw threads or in the region immediately neighboring the screw threads. Another opening intersects the wall of the housing. The two openings are spaced apart axially from each other and the pressure sensors connected to both openings. The process involved conveys a plasticized material against a resistance, the resistance being a sealing screw bearing supported within the screw housing. The pressure of the conveyed material is measured at two locations spaced apart from each other in the direction of conveyance. The two locations are disposed on both sides of a resistance body towards which the sealing screw conveys the material. The difference between the two measured values is used to indicate the degree of wear of the screw or its housing, respectively.

Abstract: The invention relates to a process for controlling the degree of attrition or wear of a sealing screw (8) conveying a plasticized material, in particular synthetic plastic material, against an resistance, wherein the sealing screw (8) is bearingly supported within a screw housing (4). For this, the pressure of the conveyed material is measured at two locations spaced apart from each other, when seen in direction of conveyance. These two locations are disposed on both sides of a resistance body (12) towards which the sealing screw (8) conveys. The difference of the two measured values is used for indicating the degree of wear of the screw (5) or its housing, respectively.

Abstract: An extruder-mixer has a plurality of rotor rings provided on the downstream end of a motor driven extruder shaft mounted for rotation in a conventional heated barrel or stator. The rings comprise a plurality of spaced driven rotor rings spaced apart from each other and a plurality of non-driven but rotatable floating rings interleaved between each pair of driven rotor rings. Both rings have parallel upstream and downstream faces between which polymer flow passageways extend so that the polymer melt moves downstream first through one type of ring followed by movement through the other type of ring and the viscosity of the melt causes the rotatable floating rings to be rotated by the driven rings at a slower speed than the driven rings so that shearing force on the melt effects mixing of the melt.

Abstract: A shear ring screw adopted for use with polymer extrusion or injection molding machinery including a first stage feeding portion (26), a second stage ring section (28) and a third stage tip section (44B). It would be generally aimed at improving the melting, dispersing and spatial distributive mixing action of such machinery. This would be generally achieved through the use of shear rings with a series of angled ports or holes. The ring section disperses fillers or additives by powerful shearing and stretching force created by relative ring to ring and ring to screw movements. The molten mixture could be further mixed and homogenized by the tube tip section which have plural of port members on radial directions and a conical shaped flow channel in axial direction.

Abstract: A plasticating apparatus adapted to handle a wide variety of synthetic resinous materials without predrying. The plasticating apparatus includes a two-stage screw rotatably and reciprocably mounted within a barrel. A surge suppressor is provided between the first and second stages and is comprised of an integral protrusion of the screw root and a deep channel section immediately preceding the protrusion. The surge suppressor prevents the surge of molten material into the vent area following the holding portion of an injection molding cycle, thereby allowing faster recovery and preventing bleeding of plasticized material from the vent opening.

Abstract: This invention relates to mixing two substantially immiscible fluids having substantial viscosity differences into a single phase solution. The invention particular includes a mixer comprising a specially designed conveyor flights to provide shear mixing without differential conveying of the fluids or causing excessive back pressure or pressure drop on the solution.

Abstract: A twin screw extruder has a casing with a working direction, two partially intersecting casing bores, which are parallel to each other, two shafts, which are disposed in the casing bores and which are drivable to rotate in the same direction of rotation about an axis of rotation, the axes of rotation having a distance A from each other, and single-flight kneading disks, which are fixed on the shafts and have surface lines extending parallel to the respective axis of rotation. The kneading disks, in a cross-section perpendicular to the axis of rotation, have a crest, which is formed as a segment of a circle about the respective axis of rotation and which has a crest angle b and a radius RA, a bottom, which is formed as a segment of a circle about the respective axis of rotation and has a bottom angle g and a radius RI and two flanks, which join the crest and the bottom, RA>RI, A≈RA+RI and 0°≦b≦45° applying.

Abstract: There is provided a multi-shaft kneading disc, kneading disc block, and a multi-shaft extruder containing the same. The kneading disc and each kneading disc in the kneading disc block having a disc shape with a central section defining an extruder shaft mounting bore and at least one lobe extending radially from said central section and having a crest end. The at least one lobe has a radius X which defines an outer diameter of the kneading disc. The central section has a radius Y which defines an inner diameter of the kneading disc. At least one other lobe extends radially from the central section and has a radius Z. The radius Z defines the outer diameter of at least one other lobe. The radius Z of the other lobe is equal to Y+⅞(X−Y) to Y+¼(X−Y).

Abstract: A mixing element for a screw extruder comprises an element including opposing lobes and a central portion having common opposing broad surfaces; one lobe broad surface being formed into a taper. The elements may be used individually or combined in blocks, with the elements of a block oriented in various combinations. The blocks may comprise two or more elements. The tapered lobes provided reduced pressure and temperature of the process as compared to prior art mixing elements. Also, more graduated control over temperature and pressure are provided according to the value of the taper magnitude, the number of elements used in a process and the relative lobe orientations in a machine.

Abstract: A method for manufacturing of a silicone rubber base composition in a mass-like form, comprises:(A) preparing a freely flowable powdered silicone rubber composition comprising(a) a cross-linkable polydiorganosiloxane with a viscosity of at least 1.times.10.sup.5 mPa.s at 25.degree. C. and(b) an inorganic filler, and(B) continuously kneading and massing the powdered silicone rubber composition in a multiple-stage siding shear-type single-screw extruder.This method provides for continuous preparation of a silicone rubber base compound without the use of a dual-screw mixer-extruder having a large length to diameter ratio, without abrasive wear of screws and cylinders with such inorganic fillers as diatomaceous earth power, quartz or a similar large-grain and hard powders, without blackening of the mixed silicone rubber composition, and without production problems associated with the use of large quantities of fumed silica, sedimentary silica, or a similar reinforcing silica.

Abstract: A mixer for plasticable resins has a fixedly positioned heated barrel with a power driven screw mounted axially in the barrel bore, a driven rotor is axially aligned with and extending in a downstream direction from the downstream end of power driven screw. A series of elongated rotor flow transfer cavities are in the outer surface of the rotor. The rotor flow transfer cavities extending inwardly and are arranged in a plurality of axially aligned rows and a plurality of annular rows concentric to the axis of the rotor. A floating sleeve is coaxially positioned over the power driven rotor and interposed between the rotor and the barrel so as to be capable of independent rotation relative to both the power driven rotor and the barrel.

Abstract: A process and an apparatus for recycling resin scrap including a thermosetting resin paint film and a thermoplastic resin substrate as its major components, wherein the resin scrap is supplied into a passage of a cylinder, melted, and delivered by screw arrays from an upstream side to a downstream side of the passage of the cylinder, and hydrolyzed by a hydrolyzing agent while forming a highly packed region with a resistor. The resistor restricts the resin scrap to flow from the upstream side to the downstream side in a short period of time, and forms the highly packed region where a contact efficiency is enhanced between the resin scrap and the hydrolyzing agent.

Abstract: Disclosed is a temperature control system and a kneading-mixing extruder apparatus implementing the temperature control system. The temperature control system includes a flow passage formed in a stationary disc having a plurality of holes provided in a kneading mechanism of the extruder apparatus, a fluid supply device for supplying temperature-adjusted fluid into the flow passage and a temperature control device for setting the temperature of the stationary disc to a desired target temperature.

Abstract: A multi-stage vacuum kneading-extruder includes a degassing chamber for storing material to be processed and reducing pressure of space for storing the material, a kneading-conveyer device for kneading while conveying the material sent from the degassing chamber, and an extruding mechanism for extruding the kneaded material, at a conveyer terminal end of the kneading-conveyer device, into a predetermined shape. The kneading-conveyer includes a pair of conveyer screws disposed one after another in a conveying direction of the material and a grinding-kneading mechanism interposed between the front and rear screws. The grinding-kneading mechanism includes a plurality of unit kneading mechanisms disposed in opposition to each other relative to the material conveying direction. Each of the unit kneading mechanisms includes an un-rotatable stationary disc, a rotary disc rotatable relative to the stationary disc and a stationary filter interposed between the stationary and rotary discs.

Abstract: A screw for a molding machine comprises a feed zone, a compression zone and a metering zone. The metering zone 12 is provided with a screw element having an intermediate mixing element 12b and a forward end mixing element 12a, and the upstream side of the intermediate mixing element is composed of a deep flight channel screw, and the downstream side of the intermediate mixing element is composed of a shallow flight channel screw.

Abstract: Improved short length extrusion cooking devices (10) are provided which can achieve product throughput and quality characteristics of conventional long-barrel extruders. The short length extruders (10) of the invention include a relatively short barrel (14) having an inlet (18) and an endmost extrusion die (20). An elongated, helically flighted axially, rotatable screw assembly (22) is positioned within the barrel (14) and is coupled to motive means (39, 39a) for rotation of the assembly (22) at a speed of at least about 500 rpm. The device (10) includes an internal, apertured flow-restricting device (60, 110) which defines a mid-barrel choke point for the material being processed. Preferably, the barrel (14) has an internal bore of generally frustoconical configuration with an effective length to maximum diameter ratio (L/D) of at least about 6.

Abstract: A kneader with a vent function, including a kneading extruder, which permits the continuous viscous flow of material to be kneaded even at a high speed rotation to prevent the generation of cuttings and exhibiting sufficient venting capability. The kneader includes a barrel having kneading chambers defined therein, a rotor rotatably inserted into the kneading chambers, and having a feed portion on an outer peripheral surface thereof. A vent port is in communication with the kneading chamber of the barrel at a position around the feed portion. The feed portion in a vent zone includes a screw tip having a material feed surface with an outwardly curved surface in section.

Abstract: An extruder apparatus for use in straining refining, separating and extruding thermo-plastic and rubber like process material includes a rotor positioned in barrel with a barrier section located between two barrel sections. The portion of the rotor in the barrier section has a smooth surface and the smooth surface and the barrier section are conical. The barrier section includes receiving and sending grooves separated by barriers. All material passing through the barrier section passes between the barriers and the smooth rotor section. Longitudinal movement of the smooth rotor section changes the clearance between the barriers and the rotor to restrict flow between a maximum flow and a closed position. The clearance can be adjusted so that different materials can be extruded in the same apparatus and adiabatic flow can be achieved. Discharge ports at the downstream end of the receiving grooves port rejected material to atmosphere.

Abstract: An apparatus for mixing and kneading raw materials, such as soap, and extruding the mixture into a predetermined shape. The apparatus includes a cylinder having a rotatable plodder worm shaft, a levigating mechanism disposed at a longitudinal position of the cylinder and including a rotary disc and a fixed disc fixed to the cylinder. The rotary disc and the fixed disc are disposed side by side along the axial direction of the plodder worm shaft and define a plurality of through holes allowing passage of the material in the axial direction. A flow passage forming member is disposed within a moving passage of the material between the rotary disc and the fixed disc and forms a flow passage allowing passage therethrough of fluid maintained at a predetermined temperature. A fluid supplying/exhausting device is provided for supplying the fluid at a predetermined flow rate to the flow passage and exhausting the fluid from the flow passage forming member.

Abstract: The disc screw extruder employs a free-floating operating member that is so constructed as to attain substantially stable axial positions within the extruder chamber. The disc component cooperates with confronting surfaces to define inner and outer throat zones, extending along the lead-in and lead-out sections of the disc component, the thicknesses of the flow paths through both of the throat zones decreasing in the outward direction of the extruder.

Abstract: A twin-shaft screw-type extruding machine comprises a casing, shafts driven to rotate in the same direction of rotation and mixing elements facing each other and associated in pairs, which are disposed non-rotatably on the shafts. Each mixing element is a disk connected with a shaft. Mixing wings are provided at equal angular distances on the fronts, facing each other, of the disk and in the vicinity of the latter's respective circumference. A mixing wing of a mixing element and a mixing wing of the associated mixing element interengage and rotate past each other, while leaving a gap.

Abstract: A vacuum kneading and extruding method includes the steps of separately and continuously measuring plural types of material and continuously feeding the material into a kneading and degassing tank; kneading the plural types of material fed, and degassing the material by decompressing a material accommodating space into a vacuum; kneading and transporting the material in a decompressed condition through a multi-stage kneading mechanism; and forming and extruding kneaded material in a predetermined shape. An apparatus for use in executing this method is included.

Abstract: A multiple-stage extruder for mixing and extruding plastic. A central area of the screw includes a first blending area that has several obliquely positioned grooves. A second blending area includes a plurality of round protrusions. Both ends of the screw are supported in a main body to prevent vibration of the unit.

Abstract: A melt-sealing device for extruders for thermoplastic polymers or rubber for sealing off the gear unit side against high-melt pressure, in which sealing is effected by the configuration of the extruder screw which includes an intake section, a compression section having a channel depth that decreases in the conveying direction, a metering section with a constant screw channel depth, a smooth annular melt channel section, and a blister element with an annular gap for the sealing melt.

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 kneading apparatus includes a plurality of rotatable discs mounted on a screw shaft disposed on a hollow cylinder and a plurality of fixed doughnut members mounted on an inner wall of the hollow cylinder. The rotatable discs and fixed doughnut members are arranged alternately in an extending direction of the screw shaft. Projected portions and recessed portions extending radially and alternately arranged in a circumferential direction are formed on opposing side faces of the rotatable disc and fixed doughnut members in such a manner that the depths thereof are increased in proportion to the distance from a center of the screw shaft. Accordingly, the kneading apparatus is allowed to have a small construction and yet capable of efficiently kneading the material. In addition, material is prevented from remaining locally in the apparatus, and thereby a proper shear force is applied to the entire material.

Abstract: A plastifying extruder of the double-screw type, to avoid dead zones in the flow, has at its throttle location throttle disks on the screws formed with outwardly open recesses angularly equispaced on the disks. Pins distributed around the screws in the throttle region project radially into gaps between the disks and can penetrate to a greater or lesser extent into these gaps to provide a variable flow cross section.

Abstract: An extrusion apparatus or extruder for mixing and extruding of thermo-plastic and rubber like process materials has a rotor member rotatable within the bore of a barrel member. Interposed between the feed end and the discharge end, the rotor and barrel members are provided with one or more mixing stages, consisting of process material transfers, rotor to barrel, barrel to enlarged rotor, enlarged rotor to enlarged barrel, enlarged barrel to enlarged rotor, enlarged rotor to barrel and barrel to rotor. Each process material transfer has the rotor or barrel member provided with multiple grooves which communicate with co-acting receiving rotor or barrel member multiple grooves. Each revolution of the rotor transfers process material from each sending groove to all of the co-acting receiving grooves, an action which reduces the thickness of the transferred material in the ratio of one to ten.

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: A method for producing powder mixtures capable of inducing an even more intimate, microhomogeneous intermixing in a heterogeneous powder composed of at least two types of powders. The method is effective even for the mixing of an aggregable powder and a nonaggregable powder. According to the method, a heterogeneous powder composed of at least two type of powders that have been preliminarily mixed by stirring is introduced into an inlet while a rotating axle is turning and is axially transported within a cylinder by a screw. As the heterogeneous powder passes between rotating disks and fixed disks, it is subjected to a highly efficient mixing by compression and shear forces due to a sliding-shear action exerted between depressions and elevations installed on the opposing surfaces of the rotating disks and fixed disks. The mixture passes in sequence through multiple stages of the rotating and fixed disks. A powder mixture, which has been microhomogeneously interdispersed, is discharged from the outlet.

Abstract: A double worm extruder for kneading units along the worms which are rotatable in the same sense. Each kneading unit has three or more circumferentially offset polygonal disks which have sealing surfaces at diametrically opposite locations closely juxtaposed with the inner wall of the housing. These sealing disks are flanked by edges which are inclined to the axes of the worms so as to insure greater flow cross sections past the disks and thereby avoid shear peaks in the extruded material and thermal decomposition thereof.

Abstract: A process is provided for modifying the residence time distribution of materials in an extruder which results in a residence time distribution comparable to that obtained in a continuous stirred tank reactor. An extruder is provided which has a section which modifies the residence time distribution of materials loaded into the extruder.

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: The invention relates to a mixer device with distributive mixing action for an extruder, an injection moulding machine and the like, including a hollow stator and a rotor arranged for rotation in the stator and at least one separate mixing ring which is provided at least on its interior surface with mixing elements and which is arranged between the rotor and stator around the rotor for free rotation, characterized in that the mixing elements includes passages which are radially orientated in the mixing ring and are facing at one end the inner stator surface and on the other the outer rotor surface, and to a rotor section, to a mixing ring, to an extruder, and to an injection moulding machine provided with same.

Abstract: An extruding apparatus having a reservoir for reserving a treatment-object material including a main raw material, additives or auxiliary materials, a screw disposed within a material-conveying passage and for conveying the material to a terminal end, and an extruding die disposed at the terminal end and for extruding the material into a predetermined shape. The material-conveying passage includes a pair of discs disposed at intermediate positions in the conveying direction of the screw and opposed to each other transverse relative to the passage. Each of the discs defines a plurality of slit pores extending in the material conveying direction, with one disc being operatively coupled with the screw to be rotatable relative to the other disc. The disc pair constitutues a milling-kneading mechanism for milling and kneading the material by causing the material to pass through the slit pores formed by the disc pair.

Abstract: A single or twin-screw device is used to incorporate additives in a thermoplastic plastics material melt. The or each barrel of the extruder includes a first feed aperture for the introduction of the melt and a second feed aperture downstream thereof for the introduction of the additives. A screw is mounted on a shaft in each barrel and includes a core and a helical flight. In the region of the second feed aperture, the flight is replaced by alternating disc members and spacer members mounted on the shaft. The diameter or major dimension of the disc members is approximately equal to the combined diameter of the screw core and its flight while the diameter of the spacer members is approximately equal to that of the screw core. The disc members have profiled downstream faces. The disc and spacing members increase mixing and consequently throughput in the region of the second feed aperture.

Abstract: In a method for processing granulate and/or pulverulent polymer with pulverulent additives in an injection moulding machine having a screw with a feed zone of constant screw core diameter, and intermediate zone with a compression and metering section and a mixing element array, with regard to particularly economic processing to high quality injection mouldings the polymer and the pulverulent additives are introduced without previous preparation directly into the feed zone of the screw and in the feed zone the polymer is thoroughly mixed with the pulverulent additives at least twice by means of mixing element arrays, the working length of the screw for the processing having at least 19 times the screw diameter.

Abstract: The invention relates to a mixer device with distributive mixing action for an extruder, an injection moulding machine and the like, including a hollow stator and a rotor arranged for rotation in the stator and at least one separate mixing ring which is provided at least on its interior surface with mixing elements and which is arranged between the rotor and stator around the rotor for free rotation, characterized in that the mixing elements include passages which are radially orientated in the mixing ring and are facing at one end the inner stator surface and on the other the outer rotor surface, and to a rotor section, to a mixing ring, to an extruder, and to an injection moulding machine provided with same.

Abstract: The mass which is made flowable (rendered plastic) must be degassed on its way to the outlet. In order to make the degassing section free of pressure a diaphragm, through which the mass flows, is provided further upstream. The extruding helix is provided with at least one helical flute, the free flow passage of which is blocked, and the diaphragm is provided with an adjustable throughput area. The diaphragm can simply consist of two perforated disks, which are rotatable with respect to each other around their axes. Each perforated disk has a fixed throughput area. The holes of both perforated disks overlap more or less, or not at all. The throughput rate of the mass through the extruding device can therefore, according to the state or the kind of mass, be regulated independently of the rotation speed of the extruding helix. Different masses can be extruded with one and the same helix, in a way hitherto not possible. One can also use an extruding helix which is shorter than was hitherto possible.

Abstract: An extruder for degassing a thermoplastic plastics material melt comprises at least one screw mounted for rotation in a barrel. The barrel includes a first feed aperture for the introduction of the melt and a degassing port downstream thereof connectable to means for degassing the melt. The at least one screw is mounted on a shaft and has a helical flight. In the region of the port, the flight is replaced by alternating disc members and spacer members mounted on the shaft. The diameter or major dimension of the disc members corresponds substantially to the combined diameter of the screw core and its flight whilst the diameter of the spacer members corresponds to that of the screw core. The disc members have profiled downstream faces and the thickness of each disc member and each spacer member lies in the range of 0.1 to 0.5 times the diameter of the screw.