Wet-type paper friction member
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United States of America Patent
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Issued Date -
Feb 17, 2005
app pub date -
May 17, 2004
filing date -
May 21, 2003
priority date (Note) -
Abandoned
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Abstract
[Problems] To provide a wet paper friction member with both excellent friction property and high frictional coefficient. [Solution Means] A wet paper friction member is produced by impregnating a paper body with thermosetting resin, curing it by heating and then forming it by pressure. The paper body comprises cellulose pulp and a filler and further comprises aramid pulp the drainability of which is adjusted to 200-400 ml and aramid pulp the drainability of which is adjusted to 450-700 ml, respectively at 10-30 wt % of a total weight of the paper body, and said whole aramid pulp the drainability of which is adjusted comprises 30-50 wt % of a total weight of the paper body. Its surface roughness before and after pressure forming is adjusted so that the load length ratio Rmr (30%).gtoreq.55% as the load length ratio is defined by Rmr(C) (C: cutting level %). Thus, high frictional coefficient, heat resistance and mechanical strength are realized simultaneously.
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