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A capstan method is used to measure the fibre-fibre and fibre-metal coefficients of friction of single polyester staple fibres. Tests have been conducted over a range of relative speeds (0.03-290 m min -1 ), normal loads (0.3-16 mN), and against two stainless steel pins of surface roughness 0.11 and 0.28 mu m RA. The fibre-fibre and fibre-metal coefficients show differences in their dependence on speed and on normal load. The differences are attributed to geometric effects and to the thermal properties of the polymer. The findings are supported by the results of similar tests on carbon and steel fibres, which were tested in isolation and in combination with polyester fibres in the fibre-fibre geometry. A test between a single polyester fibre and a nylon pin is also described.
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Robins et al. (1984) studied this question.
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