In this paper, fabric friction curve measured by KES-FB4 surface tester is investigated based on spectrum analysis. Friction spectrum is analyzed compared to surface roughness spectrum obtained simultaneously along the same direction. Samples used are 25 kinds of men’s suitings made of wool including summer and winter use. Results are obtained as follows. (1) Surface roughness of fabrics is divided into “rough” and “smooth” surface of which threshold is 4-5 μm for SMD and -7 for log Pmax, where Pmax is peak value of surface spectrum. (2)The behavior of friction spectrum is divided into three types as follows, (a) uneven surface type, (b) stick-slip (SS) type and (c) mixed type. (3)For the uneven surface type, wave number (1/cm) where the peak value of friction spectrum appears is the same as that of surface roughness spectrum. (4) For the SS type, wave number where the peak value of friction spectrum appears is 20, 40 (1/cm) and low frequency around 0, and does not coincide with that of surface roughness spectrum. (5)For the mixed type, both behaviors of uneven and SS types appear in friction spectrum. (6) The energy of friction spectrum is divided into two parts, i.e. component arised from uneven surface and component arised from stick-slip behavior.
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