Process for producing moldings

Details Process for producing moldings Process for producing moldings

1978-01-04

1979-02-20

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 51, 264523, 264328, 264DIG83, 425817R, B29D 2700

Patent

active

041406729

ABSTRACT:
A process for producing moldings comprises the steps of injecting a plastified synthetic resin into a mold cavity, thereafter or simultaneously injecting heated fluid having a viscosity of 0.01 - 100 poise into the same mold cavity to fill it with said fluid in such a manner that said heated fluid is surrounded by said synthetic resin within said mold cavity and releasing said fluid from said mold cavity after at least a portion of said synthetic resin has set. If the injected synthetic resin contains any foaming agent, a foamed article having its outer smooth skin can be obtained according to the present invention. If the injected synthetic resin contains no foaming agent, a hollow, smooth-surfaced article can be obtained.

REFERENCES:
patent: 2209877 (1940-07-01), Ferngren
patent: 2872760 (1959-02-01), Meissner
patent: 2996764 (1961-08-01), Ross et al.
patent: 3378612 (1968-04-01), Dietz
patent: 3751534 (1973-08-01), Oxley
patent: 3801684 (1974-04-01), Schrewe et al.
patent: 3966372 (1976-06-01), Yasuike et al.
patent: 4033710 (1977-07-01), Hanning
Margerison D. and G. C. East, "An Introduction to Polymer Chemistry," New York, Pergamon Press, c 1967, p. 1.
"The Condensed Chemical Dictionary," Eighth Edition, Revised by Gessner G. Hanley, New York, Van Nostrand Reinhold, c 1971, p. 644.

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