Gas-assisted injection molding process for producing hollow mold

Details Gas-assisted injection molding process for producing hollow mold Gas-assisted injection molding process for producing hollow mold

1992-02-07

1994-01-11

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264513, 264572, 425112, 425127, 425128, 425130, B29C 4314, B29C 4318

Patent

active

052778657

ABSTRACT:
A hollow molded article is produced by supplying a molten resin between a pair of a fixed mold and a movable mold before the fixed mold and the movable mold are closed, inserting at least one gas-supplying pin which is provided on a surface of the fixed mold to form a hollow part in a part of the resin and supplying pressurized gas through said gas-supplying pin before the mold closing is finished, closing the movable mold to fill the resin in a cavity formed by the molds, slightly opening the molds while pressurizing a gas in the resin to expand the hollow part and opening the movable mold to remove a hollow molded article from the molds.

REFERENCES:
patent: 4101617 (1978-07-01), Friederich
patent: 4824732 (1989-04-01), Hendry et al.
patent: 4968474 (1990-11-01), Ito

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