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, Claims
What is claimed is:
1. A twin screw extruder (1) comprising
a casing (5) getting a operating path (2);
two partially intersecting casing bores (16, 17) disposed within of the casing (5), that are parallel to each and every other;
two shafts (22, 23), which comprise each and every an axis of rotation (20, 21), that are disposed within of the casing bores (16, 17) and that are drivable to rotate within of a same exact path of rotation (18, 19) concerning the respective axis of rotation (20, 21), the axes of rotation (20, 21) getting a range A from each and every other; and
single-flight kneading disks (25, 26), that are repaired inside the shafts (22, 23) and have surface area lines (27, 28) extending parallel in the direction of respective axis of rotation (20, 21), the kneading disks (25, 26), within of a cross-section perpendicular in the direction of axis of rotation (20, 21), comprising
a crest (31), which could be shaped like a segment of the circle concerning the respective axis of rotation (20, 21) and which carries a crest angle b as well as a radius RA ;
a bottom (32), which could be shaped like a segment of the circle concerning the respective axis of rotation (20, 21) and carries a bottom angle g as well as a radius RI ; Ads by Google Automatic display Changer Plastic Extrusion & Melt Filtration Screenchanging w/Filter Ribbon www.autoscreenchanger.com Lab Twin Screw Extruder (NEW! 12mm),16mm, 20mm, 26mm Masterbatch Compounding, pelletize www.milabtech.com two flanks (33), and which subscribe to the crest (31) as well as the bottom (32);
RA >RI and A≅RA RI applying;
wherein 0°≤b≤45° applies in the direction of crest angle b.
2. A twin screw extruder (1) according in the direction of declare 1, wherein 3>≤b≤20° applies in the direction of crest angle b.
3. A twin screw extruder (1) based on declare 1, wherein 3°≤b≤10° applies in the direction of crest angle b.
4. A twin screw extruder (1) based on declare 1, wherein each and every kneading disk (25, 26) is shaped in mirror symmetry to some middle longitudinal plane (37, 38), which extends through the respective axis of rotation (20, 21) and through the center in the crest (31).
5. A twin screw extruder (1) based on declare 4, wherein two of stated kneading disks (25, 26), that are disposed on stated two shafts (22, 23) within of precisely the same exact cross section, constitute a pair of kneading disks (39), the middle longitudinal planes (37, 38) in the kneading disks (25, 26) of the pair of kneading disks (39) enclosing an addendum modification angle z to make certain how the kneading disks (25, 26) do not prevent each and every other upon rotation within of precisely the same exact path concerning the axes of rotation (20, 21).
6. A twin screw extruder (1) based on declare 5, wherein
(bE -b)≤z≤ (bE -b) applies in the direction of addendum modification angle z, the angle bE getting defined as bE =180°-2 * arccos {0,5 * [1 1/(RA /RI)]}.
7. A twin screw extruder (1) based on declare 4, wherein the middle longitudinal planes (37, 38) of two of stated kneading disks (25, 26), which straight adjoin within of the operating path (2) on the one of stated two shafts (22, 23), enclose an offset angle e.
8. A twin screw extruder (1) based on declare 7, wherein the kneading disks (25, 26) of the lowest of the one of stated two shafts (22, 23) are offset within of the operating path (2) by stated offset angle e counter in the direction of directionof rotation (18, 19) for conveyance within of the operating path (2), 0°>|e|>180° applying.
9. A twin screw extruder (1) based on declare 7, wherein the kneading disks (25, 26) of the lowest of the one of stated shafts (22, 23) are offset within of the operating path (2) by stated offset angle e within of the path of rotation (18, 19) for conveyance in the direction of the operating path (2), 0°>|e|>180° applying.
10. A twin screw extruder (1) based on declare 7, wherein the kneading disks (25, 25', 25", 25'") of the one of stated two shafts (22) are offset within of the operating path (2) in the direction of the path of rotation (18) by stated offset angle e with in |e|>180° applying and wherein the kneading disks (26, 26',26", 26'41 ) in another of stated shafts (23) are offset within of the operating path (2) within of the path or rotation (19) by stated offset angle e, with |e|>180° applying.
11. A twin screw extruder (1) based on declare 7, wherein the kneading disks (25, 26) in the two shafts (22, 23) are disposed within of precisely the same exact direction, getting stated that at different values for stated offset angle e.
12. A twin screw extruder (1) based on declare 1, wherein the kneading disks (25, 26) possess a radial hold out SRA within of the casing bores (16, 17).
13. A twin screw extruder (1) based on declare 12, wherein to the production in the radial hold out SRA within of the casing bores (16, 17) is accelerated even although the profile in the kneading disks (25, 26) stay constant.
14. A twin screw extruder (1) based on declare 12, wherein to the production in the radial hold out SRA, the radius RA is made more compact even although the diameters in the casing bores (16, 17) stay constant.
15. A twin screw extruder (1) based on declare 12, wherein to the production in the radial hold out SRA, the radius RA is decreased and RI is increased, the ratio RA /RI so getting smaller, even although the diameters in the casing bores (16) stay constant.
16. A twin screw extruder (1) based on declare 12, wherein the kneading disks (25, 26) are mounted eccentrically with respect to some lowest of the one of stated two shafts (22, 23).
17. A twin screw extruder (1) based on declare 1, wherein the axes of rotation (20, 21) are shaped to possess a center to center hold out SA, A=RA RI SA applying.