Relationships between Different Preparations of Cotton Hollow Yarn and Water Soluble PVA Extraction

IntroductionCotton hollow yarn is one of novel products . Thespinning technique is to reduce the fiber packing density inthe center of the yarn, and to i mprove the softness andbulkiness of the conventional yarn and its products . To getcotton hollow yarns , water soluble PVA filament1]orstaple fiber is used as the core which will be removedlater ,and cotton fibers as sheath wrapping on the core .The outstanding properties2]of cotton hollow yarnproducts are that they promote a lighter weig…

Relationships between Different Preparations of Cotton Hollow Yarn and Water Soluble PVA Extraction

In this paper cotton hollow yarns were obtained from the core spun yams which were produced on a little modified conventional experiment ring frame with water soluble staple PVA yam as the core. For comparison, yams with same linear densities, same twists of the sheath, different linear densities, different twist directions of the core were prepared. The results show that the tensile strengths of the hollow yarns decrease first, then increase and decrease again, at last the tensile strength trends to reach a steady state with the soluble PVA core extraction proceeding. And when the sheath linear densities of the core spun yams are constant, their twist and twist direction are same as that of the core it will be easier to remove the core of the yam with a higher core size. When the linear densities of the sheath and the core are all constant, the twists of them are same, it will be easier to remove the core of the yam with a different twist direction of core to the sheath.