Influence of filament core surface structure on tensile properties of DREF-3 yarns

18-24The influence of core filament surface structure on tensile properties of friction-spun yarns has been studied. The yarn spun from Z pre-twist filament core has superior properties while that spun from S pre-twist filament core shows inferior quality as against the yarn spun with flat filament core. Yarns spun with air-jet textured filament core exhibit significantly lower tenacity, breaking extension, modulus and energy-to-break as compared to those made from flat and twisted forms. However, in respect of sheath contribution, the yarns spun with air-jet textured filament core perform better. The sheath contribution and sheath slipping force increase with the increase in core filament overfeed during texturing. The sheath contribution is highest for the yarn spun from filament with 30% overfeed