Plastic and nonmetallic article shaping or treating: processes – Disparate treatment of article subsequent to working,... – Effecting temperature change
Patent
1994-04-01
1996-02-27
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Disparate treatment of article subsequent to working,...
Effecting temperature change
264 28, 264294, 264325, 264DIG65, 26433119, B29C 3902, B29L 3126
Patent
active
054946336
ABSTRACT:
A method of manufacturing a novel liquid cast urethane rubber object that exhibits dimensional stability when subjected to temperature fluctuations including the steps of casting a liquid urethane polymer with curing agent in a heated mold and then subjecting the cast polyurethane part to compression in a second mold while heating (typically above 170.degree. F. and preferably 212.degree. F.) followed by cooling (typically below 40.degree. F. and preferably 32.degree. F.), thus inducing a low temperature set in the final cured product. Such a method is useful to mold a polyurethane object (e.g., a wear ring for marine jet pumps and the like) to exacting tolerances without machining.
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Menges Gregory F.
Oblander M. Duane
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