The Surface Friction of Yarns
1939
Saxl, Erwin J.
Yarn friction is of considerable importance in the manufacture and conversion of all types of yarns and threads. It is indicative of the value of softening and lubricating compounds, of dyestuffs and chemicals, and also of the influence of sizing upon the yarn. Furthermore it indicates the effect of flyers, tension devices, and other guiding parts of machinery in roughening up the yarn. In order to determine the coefficient of friction of yarns and thus to get knowledge of the running quality of threads, an apparatus has been developed whereby a yarn is lifted under precision conditions until a standard rider placed upon the yarn begins to travel. At this point the angle of inclination is read on a protractor and from this the coefficient of friction of the yarn is determined simply and quantitatively.
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