COMPARATIVE-ANALYSIS OF FRICTIONAL RESISTANCE OF WOOL YARNS

A new device for measuring yam-on-yam frictional forces is presented. Six kinds of worsted plied yams are measured for frictional forces in two arrangements-perpendicular and skew. Four methods of experimental data analysis are applied: Euler's equation, Howell's equation, and tw o methods in which the cohesion forces are taken into account. The equ ations characterizing the yarn-on-yarn frictional process and consider ing the cohesion forces in two boundary cases are derived. Results obt ained using different methods are discussed.