B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/675
B29D 27/00 (1980.01)
Patent
CA 1116364
STRUCTURAL FOAM MOLDING PROCESS ABSTRACT OF THE INVENTION A process is disclosed for molding a foamed thermoplastic article characterized by a foamed core, a non-foamed exterial shell and a surface that reproducibly and faithfully replicates a predetermined portion of the inner surface of the mold in which the article is made, wherein a foamable mixture comprising molten thermoplastic material and gas foaming agent is introduced through a nozzle into a mold cavity main- tained at a temperature sufficiently low to cause the outer portion of the mixture to form a self-supporting exterior shell in the mold and introduced at a volume sufficient to fill the mold cavity, allowing the outer portion of the charge to cool and form a shelf-supporting exterior shell while maintaining the mold cavity at a pressure above the foaming pressure of the mixture and there releasing the pressure within the mold cavity to provide a temperature and pressure gradient to cause the thermoplastic material therein to contract and gas desolubilization and expansion to produce a foamed core and exterial solid shell.
312134
Hopley William G.
Union Carbide Corporation
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