Apparatus for the production of synthetic-resin bodies having co

Details Apparatus for the production of synthetic-resin bodies having co Apparatus for the production of synthetic-resin bodies having co

1975-04-29

1977-04-12

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

264DIG83, 425130, 425145, 425197, 425244, 425817R, B29D 2700

Patent

active

040172252

ABSTRACT:
An apparatus for the production of injection-molded synthetic-resin bodies having core portions and skin portions of different densities wherein a blowing agent is introduced into the core material to form macroscopic bubbles or cavities therein within the mold and under the molding conditions so that the expanding body of core material presses the skin material against the walls of the mold. The core material is injected coaxially with the skin material but under conditions such that expansion under the effect of the macropore-producing blowing agent does not occur to any significant extent until the core material is within the mold. This is a division of application Ser. No. 507,465, filed Sept. 19, 1974.

REFERENCES:
patent: 2418856 (1947-04-01), Stacy
patent: 3339240 (1967-09-01), Corbett
patent: 3696179 (1972-10-01), Jacobs
patent: 3793416 (1974-02-01), Finkmann et al.
patent: 3947175 (1976-03-01), Melcher

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