Properties of STT Yarns and Conventional Yarns

Unidirectional twists are added to self-twist yams to produce two-ply yarns, which are named twisted self-twist (STT) yams. The properties of STT yarns have been evaluated, and the comparison of yam properties between STT yams and conventional yarns has been investigated. The results show that STT yams have almost the same properties as traditional two-plied yarns with the same linear density at the aspect of yam irregularity, yarn tenacity and yam breaking extension. STT yarn has less imperfections and more hairiness than single yarn and two-plied yarn in ring spinning. Therefore STT yarn can be directly used for weaving.