Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1992-04-23
1995-01-31
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 55, 264DIG9, 264DIG15, B29C 6722
Patent
active
053856988
ABSTRACT:
A method is disclosed for heating pre-expanded foundry pattern molding beads of polystyrene or the like in a stream of hot air to reduce the vapor-forming expansion agent content for the purpose of producing more dimensionally accurate, molded foam bead casting patterns.
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Bishop Gary E.
Van Ryckeghem Patrick J.
Grove George A.
Kuhns Allan R.
Saturn Corporation
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