B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/153
B29C 44/42 (2006.01) B29C 44/04 (2006.01)
Patent
CA 1047215
PROCESS FOR PRODUCING MOLDED STRUCTURAL FOAM ARTICLE HAVING A SURFACE THAT REPRODUCIBLY AND FAITHFULLY REPLICATES THE SURFACE OF THE MOLD ABSTRACT OF THE DISCLOSURE A process is disclosed for producing a structural foam article having a surface that reproducibly and faith- fully replicates the surface of the mold within which the article was made. The process is an improvement in the "low pressure" process for producing structural foam, wherein the improvement resides in introducing the molten mixture of foamable thermoplastic material and blowing agent into the mold under such conditions that a no-slip boundary condition is maintained at an interface between the flowing thermoplastic and a predetermined portion of the interior surface of the mold, and by maintaining the temperature at said interface at or above a certain temperature (termed "replication temperature"), while the thermoplastic is flowing in the mold.
230031
Anderson Robert J.
Angell Richard G. (jr.)
Hobbs Kenneth E.
James David E.
Marsh Bertrand D.
Na
Union Carbide Corporation
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