Modeling for Yarn Path and Yarn Tension in Disk Friction Part of Double Stack False Twister

Abstract

Double-stack disk friction units were used to produce good, high-crimp yarn like wool and the results were compared to conventional triple-stack disk friction units. The quality of false-twist textured yarn from disk friction spindles is very strongly influenced by unit operating conditions and untwisting tension. The authors previously proposed a method to derive tension and untwisting tension in the yarn given the twisting tension and yarn path in double-stack disk friction units. In this study our goal was to calculate both yarn path and yarn tension. We were able to compare and confirm that the calculated yarn path and yarn tension closely matches experimental results. In addition, we succeeded in using our model to predict conditions for guide hole to produce false-twist yarn. The validity of our model was proven by the results. We have succeeded for the first time in calculating approximate yarn path and yarn tension for the false-twist process in disk friction spindle units. Our results should be helpful in designing disk friction spindle units.