Structural and functional characteristics of yarns manufactured by different pneumatic spinning systems

387-393The structural and functional properties of yarns manufactured by two pneumatic spinning systems, namely pneumatic wrapping spinning by false twist and pneumatic spinning by real wrapping twist, have been studied and compared to those of the yarns manufactured by conventional ring spinning. These properties are assessed by determining apparent diameter, yarn deformation, yarn evenness, hairiness, neps, average apparent twist, tenacity, elongation, twist vivacity, elongation due to untwist-backtwisting and residual shrinkage. The real wrapping twist pneumatic spinning system produces yarns that have a less pronounced corkscrew structure than those produced by false twist pneumatic spinning. However, the yarns produced by real twist spinning show some characteristics of irregularity and dynamometric characteristics that situate them in an inferior position to yarns produced by conventional ring spinning