Injection molding apparatus having a divided degassing pin

Details Injection molding apparatus having a divided degassing pin Injection molding apparatus having a divided degassing pin

1997-04-15

1999-02-23

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

264102, 425812, B29C 4534

Patent

active

058741160

ABSTRACT:
An injection molding apparatus for producing a molded form having a thin thickness portion through injection molding, comprising: a metal mold; a cavity formed in the metal mold for molding the molded form; a degassing hole formed in a portion of the metal mold corresponding to the thin thickness portion of the molded form; a degassing pin inserted in the degassing hole and fixed thereat, the degassing pin being longitudinally divided into at least two divisional parts; whereby gas in the cavity is forcedly exhausted not only through a first air gap between an inner surface of the degassing hole and an outside surface of the degassing pin but also through a second air gap in an abutment portion between the divisional parts of the degassing pin.

REFERENCES:
patent: 5092759 (1992-03-01), Lichtinger et al.
patent: 5439370 (1995-08-01), Lalaouna et al.
patent: 5626887 (1997-05-01), Chou et al.
patent: 5665281 (1997-09-01), Drummond

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