| 摘要 |
Friction material, to operate dry, partic. clutch or brake discs consists of a mat of fibres, impregnated with a heat curable resin, of at least 40 mm long. Also claimed are: (i) the prodn. of the friction material which consists of: a) a mixture of fibres is made; b) the mixt. is carded into a mat; c) the mat is compressed; d) glass is added to the mat during compression and then it is pre sewn; and (ii) clutch or brake discs made by claimed process. Pref. the mean fibre length is at least 120 mm. Fibres are chosen from cotton, viscose, flax, polyacrylo-nitrile, polyacrylanitrile peroxide, para-aramide, or mineral fibres. Glass is incorporated in the mat in the form of 6-21 micrometre dia. fibres.
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