Process for making a corrugation-free foam
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United States of America Patent
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Sep 20, 2005
Grant Date -
Oct 10, 2002
app pub date -
Mar 28, 2002
filing date -
Oct 28, 1998
priority date (Note) -
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Abstract
A method for extruding a corrugation-free polystyrene foam with up to 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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