Method of molding a polyurethane wear ring

Details Method of molding a polyurethane wear ring Method of molding a polyurethane wear ring

1988-08-29

1994-06-28

Lowe, James

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

264 28, 264294, 264325, 277 12, 277DIG6, B32B 310, F16C 3320

Patent

active

053245601

ABSTRACT:
A method of manufacturing a novel liquid cast urethane rubber object that exhibits dimensional stability when subjected to temperature fluctuations comprising 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 17.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.

REFERENCES:
patent: 3246065 (1966-04-01), Way
patent: 3899567 (1975-08-01), Gorman
patent: 4198037 (1980-04-01), Anderson
patent: 4319790 (1982-03-01), Thomson

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