Method for molding hollow shaped bodies

Details Method for molding hollow shaped bodies Method for molding hollow shaped bodies

1991-01-29

1993-11-16

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Utilizing special inert gaseous atmosphere or flushing mold...

2642091, 264259, 2643287, 2643288, 26432812, 26432813, 264513, 264516, 264572, B29C 4516, B29C 4920, B29D 2200, B32B 3100

Patent

active

052621057

ABSTRACT:
Molding a hollow shaped body which has a skin made of a synthetic resin and a hollow portion therein by a mold block provided with a mold cavity in the shape of the hollow shaped body, a tub into which an excess amount of the synthetic resin can flow and a small flow path communicating between the mold cavity and the tub. The process includes forming the skin of the hollow shaped body by injecting a molten synthetic resin into the mold cavity to fill up the cavity. Thereafter, a gas is introduced into the injected synthetic resin to thereby form the hollow portion. The gas injection forces a part of the synthetic resin out of the mold cavity and into the tub through the small flow path.

REFERENCES:
patent: 4101617 (1978-07-01), Friederich
patent: 4136220 (1979-01-01), Olabisi
patent: 4619847 (1986-10-01), Jackson
patent: 4719067 (1988-01-01), Thiel
patent: 4968474 (1990-11-01), Ito
patent: 5069859 (1991-12-01), Loren
patent: 5098637 (1992-03-01), Hendry

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