Abstract
Experiments are described in which a capstan method was used to measure the fibre/metal and fibre/fibre coefficients of friction of single polyester staple fibres. Tests were conducted on fibres carrying the manufacturer's spin finish, before and after partial processing into yarn, and on cleaned fibres. The cleaned fibres were tested against stainless-steel pins of roughness 0.08, 0.11, and 0.28 μm RA, in atmospheres of 65% and below 20% relative humidity. All the tests were conducted over the speed range 0.03–290 m/min. The spin finish is shown to have an increasing effect with processing of the fibres and is thought to be unevenly distributed in the hale fibre. The friction of cleaned fibres shows more correlation with the mechanical properties than with the delustrant content. Fibre/metal friction is lower against the rougher surfaces owing to variations in the true area of contact. Humidity affects the low-speed fibre/metal coefficients, which may indicate the presence of adsorbed-water layers on the...
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