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

2005-12-13

2005-12-13

Soohoo, Tony G. (Department: 1723)

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

C366S085000, C366S088000, C366S089000

Reexamination Certificate

active

06974243

ABSTRACT:
A screw element includes an outer radius Raand a core radius Rifor multiscrew extruders with co-rotating and intermeshing screw shafts. The screw element has in axial cross section through its longitudinal axis a profile which has at each of the two axial end faces (i.e. a front end face and a rear end face) only one screw flight corresponding to a conventional single-start screw element for intermeshing screw shafts. In this case, the width (flight land angle φ) of the screw flight and conversely, in a corresponding way, the width (flight land angle φ) of the screw flight are formed in a special way and a shearing flight with a constant shearing flight radius Rs, which is greater than Ri, and less than Ra, is provided.

REFERENCES:
patent: 3254367 (1966-06-01), Erdmenger
patent: 4300839 (1981-11-01), Sakagami
patent: 5048971 (1991-09-01), Wall et al.
patent: 5573332 (1996-11-01), Weihrich et al.
patent: 6062719 (2000-05-01), Busby et al.
patent: 6116771 (2000-09-01), Andersen
patent: 42 39 220 (1994-05-01), None

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