Expansion injection molding die

Details Expansion injection molding die Expansion injection molding die

1989-04-27

1990-10-16

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

264336, 425436R, 425438, 425444, B29C 4540

Patent

active

049630873

ABSTRACT:
An expansion injection molding die having a plate forming the die cavity, a backup plate, a core plate, ejector pins inserted through the backup plate and the core plate for separating the molded products from the die cavity, and a gas introducing passage communicating with the pressurized gas source for introducing gas into the die cavity. The plate that has holes through which the ejector pins are injected are formed with hollow portions. In each of the hollow portions, a guide ring is installed so that it is freely movable at least two-dimensionally. A sealing member is installed in an expanded hole portion in the guide ring so that it is in sliding contact with the ejector pin.

REFERENCES:
patent: 2799049 (1957-07-01), Wilson
patent: 4555086 (1985-11-01), Kiyotomo

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