Injection molding method and apparatus

Details Injection molding method and apparatus Injection molding method and apparatus

1977-01-21

1978-08-22

Husar, Francis S.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

425547, 425562, 425572, B29F 103, B29F 108

Patent

active

041089561

ABSTRACT:
This disclosure relates to both a method and apparatus for forming injection molded articles in a molding assembly which includes a heated runner housing adjacent a cooled mold. In a first disclosed embodiment, a slidable gate valve having a supply passageway is interposed between and in contact with both the cooled mold and heated runner. A layer of insulation material is included on the slidable gate valve to thermally segregate the differential temperature zones of the mold and runner. In a second embodiment, an axially reciprocable pin valve selectively opens and closes a passageway between a heated runner housing and a cooled mold to regulate the flow of plastic material. An annular sleeve of insulation material is telescoped over a portion of the pin valve to likewise thermally segregate the runner and mold.

REFERENCES:
patent: 2300759 (1942-11-01), Amigo
patent: 2456423 (1948-12-01), Jobst
patent: 3741704 (1973-06-01), Beasley
patent: 3918870 (1975-11-01), Tetzlaff

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