Plasticizing screw

Details Plasticizing screw Plasticizing screw

1989-05-23

1991-04-02

Jenkins, Robert W.

Agitating

Agitator

Stirrer

366 79, B29B 104, B01F 708

Patent

active

050043528

ABSTRACT:
A plasticizing screw for an injection molding machine or the like having one or more lands in a crest portion of a screw flight to prevent the screw flight from coming into contact with a cylinder wall surface when the plasticizing screw is rotated during a molding operation. The land has a smaller diameter than that of a crest portion of the screw flight and is provided at the screw flight crest portion either between leading and trailing surfaces of the screw flight or extending from the leading edge of the screw flight. The land can also be provided as a plurality of circumferentially spaced-apart lands on the side of a front surface of the screw flight, or provided at a central portion between the leading and trailing surfaces of the screw flight.

REFERENCES:
patent: 3698541 (1972-10-01), Barr
patent: 3719351 (1973-03-01), Upmeier
patent: 3721427 (1973-03-01), Upmeier
patent: 3941535 (1976-03-01), Street
patent: 4000884 (1977-01-01), Chung
patent: 4154536 (1979-05-01), Sokolow
patent: 4171196 (1979-10-01), Maillefer
patent: 4277182 (1981-07-01), Kruder
patent: 4321229 (1982-03-01), Blakeslee, III et al.
patent: 4639143 (1987-01-01), Frankland, Jr.

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