Method for making friction material without asbestos fibers incl

Details Method for making friction material without asbestos fibers incl Method for making friction material without asbestos fibers incl

1981-10-20

1983-10-25

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

With printing or coating of workpiece

Coating or impregnating workpiece before molding or shaping...

264257, B29D 302, B29G 100

Patent

active

044118511

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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patent: 2522936 (1950-09-01), Ferguson
patent: 3137038 (1964-06-01), Maynard
patent: 3476848 (1969-11-01), Schroeder
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patent: 4119591 (1978-10-01), Aldrich
patent: 4173681 (1979-11-01), Durrieu et al.
patent: 4262788 (1981-04-01), Yammamoto et al.

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