A new device for measuring yarn-on-yarn frictional forces is presented. Six kinds of worsted plied yams are measured for frictional forces in two arrangements—per— pendicular and skew. Four methods of experimental data analysis are applied: Euler's equation, Howell's equation, and two methods in which the cohesion forces are taken into account. The equations characterizing the yam-on-yam frictional process and considering the cohesion forces in two boundary cases are derived. Results obtained using different methods are discussed.
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