To control initial shudder in a wet paper friction plate, the frictional sliding surface of a wet paper friction member is preconditioned by frictional sliding contact with a mating plate until its bearing length ratio tp at a cutting depth of 10 μm is in the range from 70 to 85%. The preconditioning...http://www.google.es/patents/US7980376?utm_source=gb-gplus-sharePatente US7980376 - Wet friction plate
