Method for making friction material without asbestos fibers including repeated pressing and degassing steps
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United States of America Patent
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Oct 25, 1983
Grant Date -
N/A
app pub date -
Oct 20, 1981
filing date -
Oct 29, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A friction material particularly useful as a clutch facing is prepared by (a) impregnating a fiber base material with a binder, said fiber being other than asbestos fiber and being stable to heat without reduction in weight and in volume in an atmosphere at 300.degree. C.; (b) shaping the impregnated fiber into the predetermined shape of a crude friction material; (c) inserting said shaped material into the cavity of a mold which has been heated to a predetermined temperature; (d) pressure/heat treating said shaped material by compressing the crude friction material for 2 to 10 seconds at a predetermined pressure and at a predetermined temperature in a closed mold and degassing the compressed friction material for 0.5 to 2 seconds in an open mold, and repeating the cycle of step (d) 10 to 20 times.
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