Method and molding screw for injection molding

Details Method and molding screw for injection molding Method and molding screw for injection molding

1987-04-29

1989-01-31

Coe, Philip R.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

366144, 366293, 425204, 425208, B29B 710

Patent

active

048021407

ABSTRACT:
This invention relates to a method and molding screw for injection molding. The molding screw has a fixed inner screw mounted within a rotatable and reciprocally movable outer screw. The outer screw is continuously rotated throughout the injection cycle to (1) counter the back flow of melt material around the screw, (2) subject the melt material surrounding the inner screw to a vigorous mixing action, (3) add additional thrust to inject the melt material into the mold, and (4) return the outer screw to its initial starting position. A rod-type electrical heater is internally positioned in the fixed screw to maintain the temperature throughout the melt material surrounding the inner screw at a substantially constant value which is substantially equal to the barrel temperature.

REFERENCES:
patent: 3335461 (1967-08-01), Schwartz
patent: 3359601 (1967-12-01), Evans
patent: 3655313 (1972-04-01), Kunogi
patent: 3689182 (1972-09-01), Kovacs
patent: 3999921 (1976-12-01), Thor et al.
patent: 4164385 (1979-08-01), Finkensiep
patent: 4330214 (1982-05-01), Willert
patent: 4387997 (1983-06-01), Klein et al.
patent: 4501498 (1985-02-01), McKelvey
patent: 4557683 (1985-12-01), Meeker et al.
patent: 4637790 (1987-01-01), Klein

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