Plastic melt extruder having an adjustable throttling gap of non

Details Plastic melt extruder having an adjustable throttling gap of non Plastic melt extruder having an adjustable throttling gap of non

1993-06-25

1994-08-09

Jenkins, Robert W.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

366 87, B29B 104

Patent

active

053359917

ABSTRACT:
An extruder for processing plastic material has a housing with a longitudinal bore in which an extruder screw is coaxially fitted for rotation around an axis of the screw to advance plastic material through the bore by threads on the screw. A plurality of throttling plungers are slidably supported in rectangular slots in the housing perpendicular to the axis of the screw. The throttling plungers define an inner throttling surface facing an outer thread-free region of the screw to form an annular throttle gap therewith. In order to avoid uncontrolled changes in the throttling system, the throttling surfaces are not concentric with the outer surface of the screw, so that the throttle gap has a width which varies progressively and symmetrically around the screw.

REFERENCES:
patent: 4332481 (1982-06-01), Inoue
patent: 4462691 (1984-07-01), Boguslawski
patent: 5102602 (1992-04-01), Ziegler
patent: 5147198 (1992-09-01), Capelle

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