Frictional properties of cotton-Tencel yarns spun in different spinning systems

In this study, frictional properties of Ne 30 yarns produced systematically in different spinning systems (ring, compact and vortex, α _e = 3.7), with different raw materials (100% cotton, 50/50 cotton-Tencel blended and 100% Tencel) and with different twist factors (only for ring yarns α _e = 3.4, 3.7, 4.0), have been investigated. The effect of yarn structural properties (raw material, spinning system and twist level) and test parameters (friction surface and input tension) on yarn frictional properties were evaluated. When the effect of raw material on test results was examined, it was observed that yarn-to-yarn friction (YY) decreases, while yarn-to-metal (YM) and yarn-to-ceramic (YC) friction increases with the increasing ratio of the Tencel in the blended yarn. The effect of spinning systems on test results indicates that friction coefficients of ring and compact were similar to each other for the same raw material, while the friction coefficient of vortex yarns was different. The friction coefficients of vortex yarns were the lowest for YY friction tests and the highest for YM and YC tests. In general, it was determined that the friction coefficient of spun yarns decreases by increasing input tensions. Mainly, it has been stated that yarn structural properties and test parameters examined in this study affect the yarn friction coefficient of spun yarns and especially, it is concluded that frictional behaviour of Tencel yarns are different from those of the yarns used in the study.