Method of producing molded bodies of expanded plastic

Details Method of producing molded bodies of expanded plastic Method of producing molded bodies of expanded plastic

1979-09-06

1982-02-09

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 464, 264 467, 264 469, 264 55, 264245, 264248, 264260, 2642711, 264DIG18, 264DIG64, 264DIG83, 425588, 425817R, B29D 2700, B29F 108

Patent

active

043149545

ABSTRACT:
The invention relates to a method of producing molded bodies of expanded plastic having a predetermined density, based on a starting material in granulate form to which a blowing agent and optionally a cross-linking agent have been added, said starting material being introduced into an injection molding machine/press in which it is heated and injected/pressed into a mold. In order to obtain an efficient production process without loss of raw material and a product whose density can be determined in advance, the material in the injection molding machine/press is heated to a temperature which is below the temperature required to initiate the reaction of the blowing agent/cross-linking agent, and the blank thus formed is subsequently transferred to an expansion mold having the shape of the desired final product, but larger, than the blank. The blank is caused to expand in the expansion mold and final expansion takes place outside the expansion mold. One is thus permitted to operate with a lower pressure than required previously.

REFERENCES:
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patent: 2247337 (1941-06-01), Raflovich
patent: 3098832 (1963-07-01), Pooley et al.
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patent: 3925526 (1975-12-01), Haas
patent: 3985951 (1976-10-01), Harris
patent: 3991146 (1976-11-01), Barrie
patent: 4021380 (1977-05-01), Nuttall
patent: 4073844 (1978-02-01), Wada et al.
patent: 4152798 (1979-05-01), Akaura et al.

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