Multi-channel extrusion screw with a zig-zag undercut barrier

Details Multi-channel extrusion screw with a zig-zag undercut barrier Multi-channel extrusion screw with a zig-zag undercut barrier

1990-08-13

1991-07-30

Woo, Jay H.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

264349, 366 90, 425208, B29B 742

Patent

active

050355090

ABSTRACT:
A plasticating apparatus having a barrel and a screw rotatably disposed therein. The screw has a mixing section including a helical conveying flight to form a helical passage for transporting resinous material along the screw. The mixing section further includes a helical, zig-zag barrier flight spaced from the conveying flight to divide the helical passage into channels of varying cyclic depth in the helical direction of the channels. The portions of minimum depth of the channels define wave crests which are helically displaced from each other. The barrier flight has a first section converging toward one side of the conveying flight, and a second segment diverging away from the same side of the conveying flight. The plurality of first and second segments repeat throughout the mixing section.

REFERENCES:
patent: 3271819 (1966-09-01), Lacher
patent: 3698541 (1972-10-01), Barr
patent: 3870284 (1975-03-01), Kruder
patent: 4092015 (1978-05-01), Koch
patent: 4131368 (1978-12-01), Iddon
patent: 4173417 (1979-11-01), Kruder
patent: 4215978 (1980-08-01), Takayama et al.
patent: 4405239 (1983-09-01), Chung et al.
patent: 4896969 (1990-01-01), Dray
patent: 4925313 (1990-05-01), Nunn
patent: 4944906 (1990-07-01), Colby et al.

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