Method for injection molding plastic article with gas-assistance

Details Method for injection molding plastic article with gas-assistance Method for injection molding plastic article with gas-assistance

1990-03-05

1991-07-02

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

264161, 2643287, 2643288, 26432812, 26432813, 425812, B29C 4500, B29D 2200

Patent

active

050283774

ABSTRACT:
A method and apparatus for injection molding plastic articles with gas-assistance wherein the injected molten plastic is depressurized by a controlled amount prior to gas injection to facilitate the penetration of the gas into the molten plastic within the article-defining cavity of the mold.

REFERENCES:
patent: 4101617 (1978-07-01), Friederich
patent: 4129635 (1978-12-01), Yasuike et al.
patent: 4740150 (1988-04-01), Sayer
patent: 4830812 (1989-05-01), Kauer
patent: 4855094 (1989-08-01), Hendry
patent: 4923667 (1990-05-01), Sayer

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