Process for molding of a foamed article

Details Process for molding of a foamed article Process for molding of a foamed article

1987-03-18

1990-08-28

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 403, 264 54, 264DIG83, B29C 6722

Patent

active

049523651

ABSTRACT:
A process for producing a foamable thermoplastic resin article having a relatively thin non-foamed outer shell with a smooth surface and a foamed core portion, which has excellent dimensional stability, by pressurizing a mold cavity under a pressure of gas less than the foaming pressure and not less than the surface smoothing pressure of the foamable resin and permitting the pressure of the gas simultaneously with completion of the injection to be communicated to an atmospheric pressure or lower.

REFERENCES:
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patent: 4208368 (1980-06-01), Egli
patent: 4229395 (1980-10-01), Nagumo et al.
patent: 4255368 (1981-03-01), Olabisi

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