The coefficient of friction for yarns

Abstract

In view of the importance of the frictional characteristics in the manufacture of yarns and in the final appearance of textile products, a method has been devised with which it is possible to determine the coefficient of friction of individual yarns in absolute figures. It consists substantially in paralyzing the constant, rotary moment of an unbalanced wheel by the frictional resistance of a piece of yarn, loaded at each end with a definite weight. The yarn is in contact with one-half of the carefully standardized surface of the rim of the wheel. The mathematical analysis of the physical principle involved is given. The method described lends itself also to the investigation of the frictional characteristics of different weaving and knitting constructions, to the determination of the lubricating value of different throwing oil compounds and various oils, the influence of oxidation upon the lubricating value of oils, the change in the friction of yarns imparted to them by sizes and other agents. The coefficients of friction for several different types of yarns and conditioned yarns have been tabulated.