Abstract: A treatment element to treat material in a multi-shaft worm machine has an outer contour with at least one outer contour portion, the associated evolute of which is a quantity of at least three points, each of the points lying outside the longitudinal axis and within the outer radius of the treatment element and two respective adjacent points having a spacing from one another, which is less than half the core radius. The treatment element ensures high flexibility during the adjustment of shear and/or extensional flows on the material to be treated.

Abstract: An improved screw feeder assembly is provided for interconnection between the outlet of a preconditioner and the inlet of an extruder barrel. The assembly includes an upright housing with a pair of elongated shafts equipped with auger flighting within the housing and driven by means of motor. Preferably, the housing is mechanically coupled to the outlet and inlet with the shafts extending through the preconditioner vessel and downwardly to a point within the inlet and closely adjacent the screw(s) within the extruder barrel; the flighting is provided along the length of the housing, from a point closely adjacent the outlet and into the extruder inlet. This provides a positive conveyance of preconditioned material from the outlet to the inlet. Use of the assembly allows maintenance of superatmospheric pressures and temperatures above 212° F. within the preconditioner, which permits more efficient processing.

Abstract: Improved single screw extruders systems (40) are provided including a single screw extruder (42, 92) as well as an upstream preconditioner (44). The extruders (42, 92) include a single, internal, elongated, helically flighted, axially rotatable screw assembly (52) having one or more improved screw sections (74, 74a, 76). The screw sections (74, 74a, 76) include specially configured flighting (86) wherein adjacent flighting portions (86a, 86b) have smoothly arcuate surfaces (88) extending between the respective flighting portion peripheries (90a, 90b). This flighting design provides smooth, substantially surge-free operation while increasing SME and cook values. The preferred preconditioner (44) has independently controlled mixing shafts (106, 108) allowing the shafts (106, 108) to be rotated at different rotational speeds and/or directions.

Abstract: An extruder is provided that has a housing with at least two axially parallel shafts which are capable of being driven in the same direction and with at least two-flight intermeshing conveying elements stripping each other at an axial distance (Ax) with a small clearance over the entire circumference. The extruder has a distance between the comb of the at least one further flight and the inner wall of the housing. Each conveying element has at least two conveying sections rotated through an angle, wherein each conveying section has an axial length corresponding to at most the outer diameter of the conveying element.

Abstract: A treatment element to treat material in a multi-shaft worm machine has an outer contour with at least one outer contour portion, the associated evolute of which is a quantity of at least three points, each of the points lying outside the longitudinal axis and within the outer radius of the treatment element and two respective adjacent points having a spacing from one another, which is less than half the core radius. The treatment element ensures high flexibility during the adjustment of shear and/or extensional flows on the material to be treated.

Abstract: In an extruder wherein the slip-on elements (1) have a cross-sectional profile comprising circular arcs corresponding to the maximum slip-on element diameter, the slip-on element core diameter and the center distance of the slip-on elements (1), the slip-on element (1) has no shaft-to-hub connection in the area of the circular arc corresponding to the slip-on element core diameter and/or it is provided at its ends with reinforcement segments (13, 14).

Abstract: Provided is a kneading degree adjusting apparatus, which can have a wide adjusting range for a kneading degree even if a gate member and a cylindrical segment are not made so close as to invite a fear of metallic contacts. The kneading degree adjusting apparatus is disposed in a kneading treatment equipment, which includes a cylindrical segment formed at a predetermined portion and a kneading screw for kneading a material while feeding the same to the downstream side, thereby to adjust the kneading degree of the material. The kneading degree adjusting apparatus comprises a gate member having an opposed face confronting the outer circumference of the cylindrical segment and moved toward and away from the outer circumference of the cylindrical segment thereby to change the area of the material passage to be formed between the opposed face and the outer circumference of the cylindrical segment. The outer circumference and the opposed face are corrugated to form the passage into a bent shape.

Abstract: One object of the present invention is to provide a kneader which can diminish wear of screws and a barrel while preventing the manufacturing process for the screws and barrel from becoming complicated. In this kneader, a pair of screws are rotated about respective axes thereof to knead a material to be kneaded which is introduced into a kneading space formed within a barrel. Each screw has such a shape generating deflection in a predetermined direction perpendicular to an arranged direction of the axes of the pair of screws during kneading of the material to be kneaded, and the kneading space has a shape such that a pair of accommodating spaces which accommodate each of the screws respectively are connected together so as to overlap each other partially in the radial direction, each accommodating space being formed in such a manner that the diameter thereof in the predetermined direction in which there occurs deflection of each screw is larger than in any other direction.

Abstract: Twist kneading disks are arranged such that the width of a piece of disk is 0.1 to 0.5 times the cylinder inner diameter D, a helix angle ? as an angle between a vertex of the front surface side of the disk and vertex of the rear surface side of the disk at the tip portion is in a range of 0°<?<90° in the reverse rotating direction of the screws as viewed from a cross section of the disk in the end direction of the screw shaft, and a phase angle E as an angle in correlation between the disks around the screw shaft is in a range of 0°<E<90°. The twist kneading disks are incorporated in the plasticization kneading portion at the length of more than 1.88 times the cylinder inner diameter D.

Abstract: The invention relates to a process for extruding plastic compositions, in particular polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends with improved optical characteristics, with the assistance of a multi-screw extruder with specific screw geometries.

Abstract: The method of degassing is performed in a ring extruder wherein at least one process chamber is provided with at least one degassing opening. The radius R of the conveyor element in the degassing zone is smaller by ?R than the full radius Rv of the conveyor element required for the mutual stripping of adhering product in a closely intermeshing screw operation with adjacent conveyor elements.

Abstract: The invention relates to a process for extruding plastic compositions. The process in particular relates to the conveying, kneading and/or mixing of plastic compositions, in particular of polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends.

Abstract: The invention relates to screw elements for multi-screw extruders with screws co-rotating in pairs and being fully self-wiping in pairs, to the use of the screw elements in multi-screw extruders and to a process for extruding plastic compositions.

Abstract: Improved extruders and methods for the extrusion cooking of comestible products such as human foods or animal feeds are provided wherein the products may be produced with very low specific mechanical energy (SME) inputs as compared with conventional processing. The methods preferably involve introduction of very high levels of steam into the extruder barrel (12) during processing, which concomitantly reduces necessary SME inputs required to achieve desired cook and expansion levels in the products. In accordance with the invention, fully-cooked pet foods can be fabricated with SME inputs of up to about 18 kWhr/T, whereas aquatic feeds can be fabricated with SME inputs of up to about 16 kWhr/T.

Abstract: A method of producing an aqueous emulsion comprising a first step of kneading a mixture containing the following copolymer (A) and a polyoxyethylene polyoxypropylene block copolymer (B) by a multi-axis shearing mixer under heating to obtain a kneaded material, and a second step of dispersing the kneaded material obtained in the first step in water, and an aqueous emulsion comprising a dispersed particle containing the following copolymer (A) and a polyoxyethylene polyoxypropylene block copolymer (B) and dispersed in water, wherein the dispersed particle has a volume-based median size of 0.8 ?m or less, are provided: Copolymer (A): a copolymer containing a structural unit derived from at least one ?-olefin selected from the group consisting of ethylene and propylene and a structural unit derived from at least one (meth)acrylate selected from the group consisting of acrylates having 4 to 12 carbon atoms and methacrylates having 5 to 12 carbon atoms.

Abstract: Apparatus and process for producing hydrocarbon materials from a feed composition, the apparatus including a feed port; a viscous shear apparatus; a thermal decomposition assembly including a ribbonchannel reactor which includes an inner heated hollow cylinder; an outer heated hollow cylinder, one of which is rotatable with respect to the other, both heated hollow cylinders providing heat to the feed composition to convert it to a vapor fraction and a solid residue fraction; low height flighting mounted with respect to the inner and outer heated hollow cylinders to move the feed composition through the thermal decomposition assembly; at least one vapor port for removing the vapor fraction; and at least one solids port for removing the solid fraction.

Abstract: A plurality of paddles Pn (n=1 to 17) is provided on an external periphery of a rotary shaft 3 so as to be arranged helically at a predetermined angular pitch of 90°, and a plurality of paddles Qn is provided on an external periphery of a rotary shaft 4 so as to be arranged helically at a predetermined angular pitch of 72°. The rotary shafts 3, 4 are made to rotate in opposite directions at unequal speeds to convey an object to be kneaded in one conveying direction along the rotary shafts 3, 4 while being kneaded by the paddles. The paddle surfaces of the paddles have either a normal phase for advancing the kneaded object in a feed direction or a reverse phase, and the paddles are arranged so that phases cyclically repeat in the sequence “normal, normal, reverse” in the axial direction of the rotary shafts.

Abstract: The device for adjusting the degree of mixing according to the present invention is installed in mixing equipment equipped with a kneading/mixing screw for mixing material while feeding the material to a downstream side, wherein a gate member is moved relative to a portion of a circular section provided for the kneading/mixing screw so as to cause a change in the area of a flow path formed between the gate member and the portion of a circular section, thereby adjusting the degree of mixing of the material. A drive quantity changing device; is disposed between the gate member and a drive member.

Abstract: High-capacity extrusion die assemblies (20, 90, 130, 140, 180, 252) each having a tubular section (44, 146, 162, 268) and an elongated, axially rotatable, helically flighted screw section (56, 56a, 152, 168, 276, 278) which cooperatively define frustoconical, outwardly diverging material flow paths (75, 160, 291) at constant or differing divergence angles of from about 1-11°. The use of diverging tubular sections (44, 146, 162, 268) and screw sections (56, 56a, 152, 168, 276, 278) permits the use of larger die plates (76, 118, 292) with an increased number of die openings (80, 124, 296). This allows significant increases in extrusion production rates. The die assemblies (20, 90, 130, 140, 180, 252) can be used in the production of a wide number of human foods or animal feeds, and particularly aquatic feeds of the floating or sinking variety.

Abstract: To provide a kneading screw which can reduce such a phenomenon that a disproportional load is imposed onto a shaft of the kneading screw without degrading kneading performance of the kneading screw, a twin screw extruder with the kneading screw, and a method for assembling the kneading screw.

Abstract: A multi-shaft extruder has between an exterior housing (9) and an interior housing (10) at least six worm shafts (4) disposed in a circle (7). The drive (1) of the multi-shaft extruder has two pinion shafts (2) which are partitioned into groups of identical design and disposed on a circle (7), the pinion shafts being radially driven from the inside and from the outside at equal forces and in the same direction and in diametrical opposition and coaxially connected to the worm shafts (4) of the process part (5) via couplings (3), the worm shafts (4) having a feed length (L) of at least six Do and a Do/Di ratio of 1.5 to 1.93, wherein Do is the outside diameter and Di is the inside diameter of the feed screws (11, 12, 13) and the torque density of the extruder is at least 50 Nm/cm3.

Abstract: A mixing degree adjusting device comprises a pair of spacer members arranged at a position sandwiching both round sectional portions of a pair of screws from both sides in the aligning direction of the pair of screws, and a pair of drawing members arranged as a position sandwiching both the round sectional portions from both sides in the orthogonal direction that is orthogonal to the aligning direction. The spacer members are movable between an adjusting position opposing to the round sectional portions, and a retracting position, when the screws are extracted from the barrel, for retracting to the outside until the passage of the screws is accepted. Opposing portions opposing to the round sectional portions at the time of moving to the adjusting position are formed in a substantially linear shape extending in parallel with the orthogonal direction seen from the axial direction of the screws.

Abstract: A process for producing a cycloolefin resin composition comprising a cycloolefin resin and an additive by using a twin-screw extruder is provided, in which loss of the additive caused by volatilization through a vent during kneading is reduced and kneading of resin material with the additive can be sufficiently carried out. When the cycloolefin resin and the additive are kneaded by using a vented twin-screw extruder (10) to produce the cycloolefin resin composition containing the additive, an additive introduction opening (3) is disposed downstream of a vent (2) located nearest to a discharge opening (13) of the twin-screw extruder, and the additive is charged through the additive introduction opening located at a distance from the discharge opening of the twin-screw extruder in the range between longer than 10D and not longer than 30D.

Abstract: A multiple-shaft extruder comprises a core (4) with outward leading channels that can be flown through by a cooling liquid. At least two housing segments (16 to 19) are each provided with a cooling circuit with interconnected cooling bore holes (28), which can be flown through by a cooling liquid, are distributed in the peripheral direction and in an axially parallel manner, and which are located on the section of the housing segments (16 to 19) that faces the process chamber (2).

Abstract: The invention relates to a multiple-screw extruder that comprises a first process chamber (1) and a second process chamber (2). In the degassing zones of said extruder, at least the first process chamber is provided with at least one degassing opening. The radius R of the conveyor element in the degassing zones, in at least one conveyor element (7; 9) of at least one screw (5, 7; 5, 9) configured as a passage screw, in a subsection configured as a passage subsection (71a, 71e; 91a, 91e), along the peripheral direction of the at least one conveyor element (7; 9) is by ?R smaller than the full radius Rv of the conveyor element (6; 8) required for the mutual stripping of adhering product in a closely intermeshing screw operation with die adjacent conveyor elements (6; 8) of adjacent conventional screws (5, 6; 5, 8).

Abstract: A golf ball material composed of (A) an olefin-containing thermoplastic polymer having an acid content of at least 0.5 wt % but less than 5.0 wt %, (B) a resin composition which includes one or more selected from the group consisting of diene polymers, thermoplastic polymers and thermoset polymers, and (C) an oxygen-containing inorganic metal compound has a good thermal stability, flow and processability, making it suitable for injection molding. The golf ball material is ideal for the production of high-performance golf balls endowed with durability, scuff resistance and optimal hardness without a loss of rebound in the molded article.

Abstract: Improved, high Specific Mechanical Energy extrusion systems (20) are provided including a single or twin extruder (22) and an upstream preconditioner (24). The extruder (22) includes an elongated barrel (26) with at least one elongated, axially flighted, rotatable screw assembly (58) therein. The barrel (26) includes a mid-barrel variable restriction valve assembly (32), and the screw assembly (58) has a disrupting/homogenizing screw section (66) therein upstream of the valve assembly (32). The screw section (66) includes a plurality of alternating pitch screw parts (82-92). Preferably, the barrel (26) also has an atmospheric vent (36) downstream of the valve assembly (32).

Abstract: A device for processing material by mixing and/or plasticization or agglomeration has a screw housing, in which at least two screws are situated adjacent to one another. The screw channels are engaged with one another. The screws are driven to rotate by at least one motor. The screws are supplied with the material through an intake opening of the screw housing and the processed material leaves the screw housing through at least one outlet opening. An apparatus is provided, which in operation of the device provides the gap which exists between adjacent screw channels of the screws alternately with a periodic enlargement or reduction, which is superimposed on the rotational movements of the two screws. In the method for material processing, the material, in addition to the compaction which is caused by the conveyance action of the screws, is subjected to periodic squeezing by the screws.

Abstract: A method for producing a masticated rubber, which comprises the steps of masticating rubber at a shear rate of from 500 to 4,500 (l/s); and obtaining masticated rubber having a weight-average molecular weight of from 100,000 to 1,300,000.

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

Abstract: A rotor segment is assembled in a screw set for use in a twin-screw extruder for mixing and dispersing a material to be kneaded into a kneaded product having a desired state of kneading. The rotor segment has a plurality of kneading blades that provide a plurality of tip clearances different from each other at least in the circumferential direction. The rotor segment also has the same sectional shape as a screw and a kneading disk, which are assembled in other screw segment and kneading disk segment of the screw set, except for crest portions of the kneading blades. A degradation in quality of a kneaded product attributable to residence of a target material of kneading for a long time can be satisfactorily prevented. A load partially imposed on the rotor segment can be reduced, thereby preventing a damage of the screw set in which the rotor segment is assembled.

Abstract: An extrusion apparatus including a mixing chamber comprising two intersecting housing bores and an inlet positioned to receive material into the mixing chamber. Two screw shafts are supported for rotation about respective generally parallel axes and include respective screw sections positioned for co-wiping intermeshing rotation within the respective housing bores of the mixing chamber. The apparatus supports screw shaft rotational speeds greater than approximately 800 rpm and includes screw shaft conveying portions that are rotatably cantilevered for self-journaled support within respective separate conveying chambers arranged generally parallel to one another downstream of the mixing chamber.

Abstract: A continuous bi-metallic twin bore barrel is produced by forming first and second single bore barrels, centrifugally lining the bores of the single bore barrels with a bi-metallic liner, heating the single bore barrels to harden the linings, fastening each single bore barrel into a barrel machining jig, and cutting each single bore barrel along its length to expose its bore. The barrel machining jigs are fastened together such that two single bore barrels are positioned adjacent and in contact with one another and their bores are in communication with one another. The two single bore barrels are seal welded together to form a twin bore barrel. The twin bore barrel is removed from the jigs and clamped along its length.

Abstract: In the case of an extruder with at least two parallel, rotating shafts turning in the same direction, the shafts are equipped with interlocking feed screw segments (24) and working segments (26). The working segments (26), which lead to a greater spread between the two shafts than the feed screw segments (24), are formed as a single piece as a combined element (22) using the feed screw segment (24).

Abstract: An extrusion apparatus including a mixing chamber comprising two intersecting housing bores and an inlet positioned to receive material into the mixing chamber. Two screw shafts are supported for rotation about respective generally parallel axes and include respective screw sections positioned for co-wiping intermeshing rotation within the respective housing bores of the mixing chamber. The apparatus supports screw shaft rotational speeds greater than approximately 800 rpm and includes screw shaft conveying portions that are rotatably cantilevered for self-journaled support within respective separate conveying chambers arranged generally parallel to one another downstream of the mixing chamber.

Abstract: An apparatus for dispersing and melting flowable substances includes axis-parallel supporting shafts rotatable in the same direction. Screw elements with the same direction of thread are fitted on the shafts so as to rotate in unison and intermesh. The screw elements have screw portions disposed at a progressive angular offset from each other with the same sense of rotation so as to form faces. The screw elements are of single- or double-flighted form. The axial length of each screw element is a fraction of the pitch of the screw crest of each screw portion.

Abstract: An extruder includes a barrel and a kneading screw extending through the barrel in a rotatable fashion. The kneading screw is provided with a devolatilization portion. The devolatilization portion includes a kneading flight that is twisted in a direction for transferring a material downstream. The kneading flight kneads the material while transferring the material downstream and separates a volatile component from the material. Impregnation sections, which allow the kneading chamber to be impregnated with the material, are respectively disposed adjacent to an upstream side and a downstream side of the devolatilization portion so that the air-tightness of the devolatilization portion of the extruder is maintained. Accordingly, an efficient devolatilization operation of the material is achieved.

Abstract: Method and device for reprocessing a thermoplastic polycondensate, in particular for the recycling of thermoplastic polycondensates, such as polyethylene terephthalate, polyester or polyamide is provided. The polycondensate is introduced into an extruder in a solid state. The polycondensate is then heated to a temperature below melting temperature and degassed or dried at below atmospheric pressure or with an inert gas added. Preferably, to prevent the polycondensate flakes from escaping through a degassing opening, a conveying device is used to convey the escaping flakes back into the extruder. The dried flakes are then melted.

Abstract: A rubber kneading machine obviates an operator having to touch rubber on a rotating roll surface to perform a rubber kneading operation, permits unattended operation, is intrinsically safe, improves a rubber kneading process productivity, secures stable quality of kneaded rubber, and allows a closed rubber supplying mechanism to be easily opened and exposed for easy cleaning. The rubber kneading machine includes two horizontal rolls closely disposed vertically, decelerators and variable speed motors rotating the rolls at different speeds, and a screw extruder supplying a rubber lump fed into a hopper at a proximal end to the rolls. A rubber circulating mechanism constructed mainly of a scraper and a belt conveyor, or a belt conveyor above the upper roll, feeds a rubber sheet, which has left the rolls, to the hopper. A mechanism releasing the screw extruder makes it possible to open and expose closed portions to facilitate cleaning.

Abstract: An extruder has at least three parallel, co-rotating shafts disposed in a cavity therein along a circle. The shafts are equipped with screw elements closely intermeshing over their whole circumference. At least one screw element is formed as a passage screw element with recesses in the screw crest, screw core and/or screw flank. Downstream of a supply port an element is provided for inhibiting the product flow in the flight of the passage screw element. A degassing opening is located downstream and adjacent the inhibiting element.

Abstract: In an extruder for continuous working and/or processing of flowable substances having at least two parallel, corotating shafts equipped with intermeshing screw elements whose face is limited by circular arcs corresponding to the outside screw diameter, the screw core diameter and at most the center distance of the screw elements, and guided on circular segments of the extruder housing that are parallel to the shafts, at least one screw element (1) has a plurality of concentric ring portions (8) spaced a distance apart and formed by grooves (12) turned into the screw element (1).

Abstract: Twist kneading disks are arranged such that the width of a piece of disk is 0.1 to 0.5 times the cylinder inner diameter D, a helix angle ? as an angle between a vertex of the front surface side of the disk and vertex of the rear surface side of the disk at the tip portion is in a range of 0°<?<90° in the reverse rotating direction of the screws as viewed from a cross section of the disk in the end direction of the screw shaft, and a phase angle E as an angle in correlation between the disks around the screw shaft is in a range of 0°<E<90°. The twist kneading disks are incorporated in the plasticization kneading portion at the length of more than 1.88 times the cylinder inner diameter D.

Abstract: A kneading apparatus includes a barrel having a chamber, which is a tubular hollow, a biaxial screw set for extruding a material to be kneaded downstream by rotation of the biaxial screw set inside the chamber, and kneading blade sections, mounted in the screw set, for kneading the material by shearing the material in tip clearances and a wedge-shaped space between an inside wall of the chamber and the kneading blade sections. The tip clearance becomes narrower from the upstream side to the downstream side in the direction of extrusion of the material. The kneading apparatus, which performs a continuous kneading operation, makes it possible to set proper kneading conditions in accordance with changes in the state of a material being continuously kneaded, and achieves high kneading efficiency.

Abstract: A modified kneading element for a screw extruder, peripherally congruent, aligned, and contiguous with a cross-sectional profile of a modified conveying element, includes a central portion defining a root diameter having a shaft receiving bore defined therein; and at least one lobe extending radially from the central portion, each lobe having an outer periphery ridge and first and second lateral sidewalls, wherein one of the lateral sidewalls of each lobe is concave between the outer periphery ridge and the central portion. Kneading blocks including such kneading elements and screw extruders including such kneading blocks are also provided.

Abstract: A screw with a heat exchange function is rotatably fit in a barrel, and includes a heat exchange medium chamber located at a center section in the radial direction, running along the lengthwise direction. The chamber stores a heat exchange medium supply pipe supplying a heat exchange medium. The heat exchange medium supply pipe is constituted by split pipes split into two or more sections in the lengthwise direction. Pipe connection joints connect the split pipes with each other while securing such degrees of freedom so that these split pipes can move by predetermined quantity in the lengthwise direction and the radial direction. The screw enables to stably supply a heat exchange medium for a long period without fatigue fracture of a heat exchange medium supply pipe even if the screw is bent during mixing and extrusion of a raw material.

Abstract: An extruder capable of obtaining a treatment volume equal to that of the conventional art without enlarging a screw diameter is provided. The extruder includes screw shafts, a drive unit, and a barrel, in which three or more screw shafts having the same diameter and the same root diameter in a waveform shape are engaged with each other and arranged in parallel to each other horizontally or nearly horizontally, while a distance between axial centers is made equal. According to the above configuration, the same treatment volume as that of a conventional extruder can be handled by screw shafts of smaller diameter as compared with that of the conventional art. By using the screw shafts of the smaller diameter as compared with the conventional art, temperature irregularities of an extrusion material in screw grooves, leakage of the extrusion material from the screw shafts, an installation area of the extruder, and the like conventional trouble of various kinds can be eliminated.

Abstract: The invention relates to a multi-shaft extruder for the continuous treatment and/or processing of bulk material, especially a powdery, granular or flocculent product, comprising a plurality of shafts (3) which are arranged in a crown-like manner in a cavity (1) of an extruder housing (2), said shafts extending parallel to the axial direction (A) of the extruder and forming an inner processing chamber (1a) inside the crown, and an outer processing chamber (1b) outside the crown. Each shaft carries a number of axially successive processing elements (4), at least part of the same being elements (4a; 4c; 4e) having a transporting effect, and with which adjacent shafts engage in a sealed manner at least in partial regions.

Abstract: The invention relates to a multi-screw extruder for the continuous treatment and/or processing of a bulk material, especially a product in powder, granular or flake form, comprising several shafts (3) which are arranged in a ring shape in a cavity (1) of an extruder housing (2) and which extend parallel to the axial direction (A) of the extruder. The extruder housing (2) is provided with axially parallel, concave segments (5a, 6a) of a circle on the radially inner (5) and radially outer (6) surfaces of the cavity (1). These circle segments act as a guide for the axially parallel shafts (3) with their processing elements (4) on the inside (5) or on the outside (6) of the shaft ring (3, . . . ). The inventive improvement lies in the radial extension of the axial partial area of the cavity (1) containing the shafts (3), which is located in the area of the feed opening (9), this radial extension (10b) extending along part of the shaft ring (3, . . . ) in the peripheral direction (U) of the same.

Abstract: An apparatus for homogenizing and/or dispersing at least one viscous substance and at least one solid and/or at least one other substance of different viscosity includes in a space in a housing axis-parallel rotatable shafts disposed along a circle with equal central-angle distance and provided with tightly intermeshing screw elements. The shafts in the area outside the openings in the housing are provided with screw elements having a pitch (S) of at most three quarters of the outside screw diameter (D) over a length (L=L1+L2+L3) corresponding to at least ten times the outside diameter (D) of the screw elements.

Abstract: An extruder drive has a housing, at least two extrusion worms each having a drive shaft extending into the housing, and at least one drive motor including at least one cylindrical stator fixed in the housing and a cylindrical rotor cooperating with the stator so as to be rotatably driven by the stator. The rotor surrounds the drive shafts, and each of the drive shafts is independently connected to the rotor for driving thereby.