Barrier screw

Details Barrier screw Barrier screw

1991-08-30

1992-08-25

Simmons, David A.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

366 89, 425208, B29B 742

Patent

active

051413264

ABSTRACT:
A barrier screw having a feed zone, a compression zone and a metering zone, the screw including a shaft, a main flight provided on the shaft and a subflight provided on the shaft. The subflight is developed on the compression zone and then joins with a rear surface of the main flight prededing the subflight by one pitch at an end portion of the metering zone. The subflight defines a melt channel whsoe depth is substantially constant, so that the mixing function of the screw is improved.

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patent: 4341474 (1982-07-01), Wheeler, Jr. et al.
patent: 4733970 (1988-03-01), Vohana
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patent: 4770539 (1988-09-01), Hedthe
patent: 4944906 (1990-07-01), Colby et al.

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