Apparatus and process for making a corrugation-free foam

Details Apparatus and process for making a corrugation-free foam Apparatus and process for making a corrugation-free foam

B - Operations, Transporting

29

C

B29C 47/20 (2006.01) B29C 47/90 (2006.01) C08J 9/12 (2006.01) C08J 9/228 (2006.01)

Patent

CA 2536115

A method and apparatus for extruding a corrugation-free polystyrene foam with 100% carbon dioxide as the blowing agent by extruding the extrudate through an annular die opening so that it contacts a choke ring inner surface. A foam made with the apparatus according to the invention will have no visible corrugations and an average cell size of less than 0.35 mm.

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