Screw element for same-sense rotating multi-screw extruders

Details Screw element for same-sense rotating multi-screw extruders Screw element for same-sense rotating multi-screw extruders

B - Operations, Transporting

29

C

B29C 47/40 (2006.01) B29B 7/42 (2006.01)

Patent

CA 2441329

The invention relates to a screw element with an outer radius R a and a core radius R i for multiscrew extruders with co-rotating and intermeshing screw shafts, in particular for twin-screw extruders, which has in axial cross section through its longitudinal axis (10) a profile which has at each of the two axial end faces (font end face 8, rear end face 8') only a screw flight (1, 1') corresponding to a conventional single-start screw element for intermeshing screw shafts. In this case, the width (flight land angle ~) of the screw flight (1) and conversely, in a corresponding way, the width (flight land angle ~) of the screw flight (1') are formed in a special way and a shearing flight (7) with a constant shearing flight radius R s, which is greater than Ri and less than R a, is provided.

La présente invention concerne un élément de vis sans fin ayant un rayon externe Ra et un rayon central Ri, destiné à une extrudeuse à vis sans fin multiples comportant des arbres de vis sans fin s'engrenant et tournant dans le même sens, destinée notamment à une extrudeuse à deux vis sans fin qui, en section axiale selon son axe longitudinal (10), a un profil qui, aux deux côtés frontaux axiaux (côté frontal avant 8, côté frontal arrière 8'), ne forme respectivement qu'une crête de vis (1, 1') correspondant à un élément de vis sans fin à pas simple, courant, destiné à des arbres de vis sans fin qui s'engrènent. La largeur (angle de crête j) de la crête de vis (1) et respectivement à l'inverse la largeur (angle de crête j) de la crête de vis (1') ont une forme particulière, et une arête de cisaillement (7) est formée, celle-ci ayant un rayon constant Rs supérieur à Ri et inférieur à Ra.

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