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A versatile instrument for measuring the kinetic friction of textile yarns over any test object is described. The instrument incorporates new features for more precise friction evaluation, such as a feedback control for continuous testing and an accurate system for applying constant input tensions of any desired value. The instrument collects friction data continuously, using the established technique of measuring the input and output yarn tensions over the test object, by use of differential capacitor transducers accurate to ±0.1 g. Using Howell's model of kinetic friction, the relationship describing the dependence of the friction force F on the normal load W for a worsted yarn over metal has been shown to be given by F=0.637 W0.782. Kinetic measuring of yarn/metal, yarn/yarn friction can be performed on most types and counts of yarn.
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J. J. F. Knapton (1966) studied this question.
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