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

B - Operations, Transporting

29

C

18/675

B29C 44/12 (2006.01) B29C 44/08 (2006.01) B63B 5/24 (2006.01) B63C 9/08 (2006.01)

Patent

CA 1149565

ABSTRACT OF THE DISCLOSURE The invention relates to a method of producing molded bod- ies of expanded plastic having a predetermined denaity, 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 mold- ing 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 mold- ing machine/press is heated to a temperature which is below the temperature required to initiate the reaction of the blow- ing 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 ex- pansion takes place outside the expansion mold. One is thus permitted to operate with a lower pressure than required pre- viously.

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