Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1998-02-27
2000-08-15
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 85, 264102, B29C 4402
Patent
active
061031542
ABSTRACT:
A method for injection-molding a cross-linked, foamed composition including the introduction of an inert gas into a mold chamber of a preheated mold to evacuate air and oxygen from the mold chamber. A mixture of a resin, a cross-linking agent and a chemical blowing agent are introduced into the mold chamber after the inert gas has evacuated air and oxygen from the mold chamber. The inert gas is evacuated from the mold chamber while the mixture substantially fills the mold chamber. The mixture is heated within the mold chamber to a temperature sufficient to thermally decompose the chemical blowing agent. The temperature of the mixture is maintained within the mold chamber until the resin substantially forms a cross-linked composition. The mold is opened and the cross-linked composition foams to produce a finished product that is free of oxidation.
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Branger Robert Michael
Fortier David N.
Kuhns Allan R.
Reebok International Ltd.
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