Process for injection molding a hollow plastic article

Details Process for injection molding a hollow plastic article Process for injection molding a hollow plastic article

1991-06-03

1992-08-18

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 53, 2643288, 26432812, 26432813, 26432814, 26432816, 264572, B29C 4500, B29C 6720, B29D 2200

Patent

active

051397145

ABSTRACT:
A process for injection molding a hollow plastic article in which a low pressure heat-activated gas is injected in combination with a plastic material into a mold cavity of a plastic injection mold unit. When the plastic material and heat-activated gas enter the mold cavity, the gas expands to outwardly exert pressure on the plastic material thereby urging the plastic material towards the walls of the mold cavity to, in turn, form the hollow portions of the hollow plastic article. The gas remains within the hollow plastic article and continues to exert outward pressure until the plastic article has substantially cooled and hardened at which time the gas becomes dormant. Accordingly, no venting of the gas from the plastic article is necessary.

REFERENCES:
patent: 2331688 (1943-10-01), Hobson
patent: 2516552 (1950-07-01), Clark et al.
patent: 2710427 (1955-06-01), Cantor
patent: 3021559 (1962-02-01), Strong
patent: 4033710 (1977-07-01), Hanning
patent: 4101617 (1978-07-01), Friederich
patent: 4140672 (1979-02-01), Kataoka
patent: 4247515 (1981-01-01), Olabisi
patent: 4474717 (1984-10-01), Hendry
patent: 4824732 (1989-04-01), Hendry et al.
"Hettinga's Simultaneous Approach: Liquid Blowing Agent", Plastics Machinery and Equipment, Dec. 1985.

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