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It was difficult to measure the bending friction of fiber and yarn at arbitrary angle and also to measure it continuously. So, an apparatus to measure friction of spun yarn in contact with a cylinder is devised and experiments are carried out on several kinds of spun yarn. Moreover, on the basis of those experimental data, a study is made on the frictional mechanism of spun yarn.The results obtained are as follow:1) The apparatus measures the frictional force or friction coefficient of spun yarn in contact with a cylinder, changing the angle from 0° to 180° and also the velocity.2) The frictional force or friction coefficient of spun yarn is dependent upon the change of contact length and contact width of spun yarn on a cylinder.It is pointed out in other report that the contact width changes with yarn diameter, the number of twists, fineness, fiber length, friction coefficient of fiber and dead weight in measuring.

AN APPARATUS FOR MEASUREMENTS OF BENDING FRICTION OF YARN AND EXPERIMENTAL RESULTS ON SPUN YARNS