Measurement of the dynamic friction between cellulose acetate yarn and a chromium plated cylinder, using the Buckle and Pollitt tester, is described. Trials determining the variation of friction with (a) initial tension, (b) radius of test surface, (c) yarn speed, (d) twist, (e) oil content and (f) oil viscosity have been carried out. The results of trials (a) and (b) have been fitted to an equation previously published by Howell.
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Coulson et al. (1955) studied this question.
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