Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1990-01-12
1992-03-31
Dawson, Robert A.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 403, 264 406, B29C 6722
Patent
active
051005972
ABSTRACT:
In a method for making objects of foamed, thermoplastic synthetic substance, air pressure is maintained in the mold while it and the contained plastic particles are heated, said air pressure being equal to or slightly higher than the pressure of the steam used for heating. When the mold has reached the saturated steam temperature, the air pressure is reduced to fuse the prefoamed synthetic particles together. Thereafter steam is introduced to displace the air in the mold and heat the synthetic particles to the temperature required for fusing or sintering.
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Dawson Robert A.
Kuhns Allan R.
Lehmann H. Gibner
Lehmann K. Gibner
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