Method of producing foamed thermoplastic resin articles having s

Details Method of producing foamed thermoplastic resin articles having s Method of producing foamed thermoplastic resin articles having s

1976-07-27

1978-06-20

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 53, 264 54, 264328, 264DIG5, 264DIG14, 264DIG83, 428315, B29D 2700

Patent

active

040962180

ABSTRACT:
A method of producing foamed thermoplastic resin articles having smooth and glossy surfaces free from swirl marks and hair cracks, which comprises melting a thermoplastic resin containing a condensable blowing agent and an organic chemical blowing agent, injecting, in full shot, the molten resin into a mold cavity to which a pressurized gas is being applied during said injection, terminating the application of the pressurized gas to the mold cavity, enlarging the volume in said molded cavity by movement of a mold wall, and thereafter cooling and solidifying the resin to form the foamed articles.

REFERENCES:
patent: 3058161 (1962-10-01), Beyer et al.
patent: 3268635 (1966-08-01), Kraus et al.
patent: 3399098 (1968-08-01), Omoto et al.
patent: 3697204 (1972-10-01), Kyritsis et al.
patent: 3773873 (1973-11-01), Spaak et al.
patent: 3776989 (1973-12-01), Annis et al.

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