3764642 is referenced by 63 patents and cites 7 patents.

This invention relates to the manufacture by extrusion profiled products of expanded plastic material. An expansible plastic composition is extruded through an annular die opening into a cooled shaper having the same cross-section as the desired product, in such a manner that a high-density, rigid skin is formed on the extrudate and the composition expands inwardly within the shaper.

Title
Method for extruding profiled sections of expanded thermo plastic material having an integral skin
Application Number
04/808,760
Publication Number
3764642
Application Date
March 20, 1969
Publication Date
October 9, 1973
Inventor
Boutillier Pierre Emile
Assignee
Societe Anonyme Ugine Kuhlmann
IPC
B29d 27/00
B29d 07/02
B29C 47/00
B29C 47/06
B29C 44/00
B29C 44/22
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