Injection screw

Details Injection screw Injection screw

1997-12-24

1999-11-16

Soohoo, Tony G.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

B29B 742, B29C 4560

Patent

active

059845171

ABSTRACT:
An injection screw comprise a rear end to a front end of an effective length of the screw compartmented in the order of a feed zone, a compression zone and a metering zone, wherein the metering zone is constituted by the first metering zone, the second metering zone and the relaxation zone. A root diameter of the second metering zone is formed in a smaller diameter than a root diameter of the first metering zone and a screw channel depth is set deeper than a screw channel depth of the first metering zone. Variations in a resin temperature at injecting is solved and melting and kneading through a entire screw further are improved by only partial changing of the configuration of the metering zone.

REFERENCES:
patent: 3431599 (1969-03-01), Fogelberg
patent: 3602950 (1971-09-01), Bielfeldt
patent: 3902704 (1975-09-01), Ishibashi et al.
patent: 3992500 (1976-11-01), Kruder et al.
patent: 4118164 (1978-10-01), Wenger et al.
patent: 4255379 (1981-03-01), Frankland, Jr.
patent: 4944906 (1990-07-01), Colby et al.
patent: 4994223 (1991-02-01), Hestehave et al.

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