Abstract: In a multi-shaft extruder for the processing of free-flowing material having a barrel and a plurality of co-rotating, tightly intermeshing conveyor shafts (1 to 3) arranged in parallel which have at least two flights and are each guided in a bore (1? to 3?) in the barrel, each conveyor shaft (1 to 3) is spaced with the ridge (O) of one of its flights from the bore wall (1?, 2?, 3?) by a clearance over at least part of the processing length of the extruder, whereas a gap is formed between the ridge (a, b, c) of another of its flights and the bore wall (1?, 2?, 3?).

Abstract: An extruder having a housing (1) comprises at least two conveyor shafts (2, 3) having conveyor cross sections mutually wiping each other that can be driven in the same direction and are disposed in at least two housing bores (11, 12) having a cylindrical or conical design, the axes (15, 16) thereof being disposed parallel to or at an angle to each other, the distance (A) between the axes of the two housing bores (11, 12) being greater than D/1.4142, where D is the diameter of the cylindrical bore or the greatest diameter of the conical bore, and a clearance (a?) being provided between the housing bores (11, 12) and the outer diameter (DE) of the conveyor shafts (2, 3). Each conveyor shaft (2, 3) comprises a plurality of conveyor segments (17a through d, 18a through d), wherein the offset angle of at least two adjacent conveyor segments (17a, 17b, 18a, 18b) on each conveyor shaft (2, 3) relative to each other is 180°.

Abstract: In a multi-shaft extruder for the processing of free-flowing material having a barrel and a plurality of co-rotating, tightly intermeshing conveyor shafts (1 to 3) arranged in parallel which have at least two flights and are each guided in a bore (1? to 3?) in the barrel, each conveyor shaft (1 to 3) is spaced with the ridge (O) of one of its flights from the bore wall (1?, 2?, 3?) by a clearance over at least part of the processing length of the extruder, whereas a gap is formed between the ridge (a, b, c) of another of its flights and the bore wall (1?, 2?, 3?).

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: An extruder comprises a displacement part with a housing, inside of which at least one screw shaft is housed and which is provided, at one end, with a material entry opening for the material to be processed and, at the other end, with a material outlet opening for the processed material, and with an intermediate opening between the material entry opening and the material outlet opening for discharging gas from the displacement part. A material retaining device is connected to said intermediate opening and has at least one screw shaft inside an intermediate housing. This screw shaft extends from the intermediate opening to a gas discharge opening in the intermediate housing and conveys material entering the intermediate housing back into the displacement part.

Abstract: An extruder having a housing (1) comprises at least two conveyor shafts (2, 3) having conveyor cross sections mutually wiping each other that can be driven in the same direction and are disposed in at least two housing bores (11, 12) having a cylindrical or conical design, the axes (15, 16) thereof being disposed parallel to or at an angle to each other, the distance (A) between the axes of the two housing bores (11, 12) being greater than D/1.4142, where D is the diameter of the cylindrical bore or the greatest diameter of the conical bore, and a clearance (a?) being provided between the housing bores (11, 12) and the outer diameter (DE) of the conveyor shafts (2, 3). Each conveyor shaft (2, 3) comprises a plurality of conveyor segments (17a through d, 18a through d), wherein the offset angle of at least two adjacent conveyor segments (17a, 17b, 18a, 18b) on each conveyor shaft (2, 3) relative to each other is 180°.

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: For driving an extruder (1) having disposed along a circle a plurality of shafts (3) with processing elements (4), the shafts (3) are connected to the output shafts (11) of a gearing (7) which are provided with output pinions (12, 13). The output pinions (12, 13) are disposed axially offset so that adjacent output shafts (11) have a different length (L1, L2) between the end facing the extruder (1) and the output pinion (12, 13). The axially offset output pinions (12, 13) are in engagement each with a sun gear (18, 19). One sun gear (19) is connected to a hollow torque shaft (21) and the other sun gear (18) to an inner torque shaft (22) disposed therewithin. The hollow torque shaft (21) and the inner torque shaft (22) are configured such that the difference in torsional rotation angle caused by the different length (L1, L2) of the output shafts (11) is compensated by a different torsion of the hollow torque shaft (21) and the inner torque shaft (22).

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: 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: For driving an extruder (1) having disposed along a circle a plurality of shafts (3) with processing elements (4), the shafts (3) are connected to the output shafts (11) of a gearing (7) which are provided with output pinions (12, 13). The output pinions (12, 13) are disposed axially offset so that adjacent output shafts (11) have a different length (L1, L2) between the end facing the extruder (1) and the output pinion (12, 13). The axially offset output pinions (12, 13) are in engagement each with a sun gear (18, 19). One sun gear (19) is connected to a hollow torque shaft (21) and the other sun gear (18) to an inner torque shaft (22) disposed therewithin. The hollow torque shaft (21) and the inner torque shaft (22) are configured such that the difference in torsional rotation angle caused by the different length (L1, L2) of the output shafts (11) is compensated by a different torsion of the hollow torque shaft (21) and the inner torque shaft (22).

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 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: 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: To drive an extruder which has several axially parallel shafts rotating in the same direction, with conveyor elements, arranged around a circle at equal angles with respect to each other, the shafts are attached to the driven shafts of a gear system. Each driven shaft has a pinion, and each driven pinion engages both with an externally-toothed drive wheel and with an internally-toothed hollow gear wheel. The externally-toothed drive wheel and the internally-toothed hollow gear wheel are driven with the same torque.

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 extruder comprises a displacement part with a housing, inside of which at least one screw shaft is housed and which is provided, at one end, with a material entry opening for the material to be processed and, at the other end, with a material outlet opening for the processed material, and with an intermediate opening between the material entry opening and the material outlet opening for discharging gas from the displacement part. A material retaining device is connected to said intermediate opening and has at least one screw shaft inside an intermediate housing. This screw shaft extends from the intermediate opening to a gas discharge opening in the intermediate housing and conveys material entering the intermediate housing back into the displacement part.

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 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).