Influence of the Core-sheath Weight Ratio and Twist on the Tensile Strength of the Ring Core Yarns with High Tenacity Filaments

Core spun yarns are applied for various purposes that especially require the multi-functional performance. This research reports on the core spinning effect on the yam strength. We prepared various core yarns by combining different kinds of high tenacity filaments in core with cotton staples in sheath with various twist levels in the ring spin system. And the tensile strength was tested to investigate the contribution of the core-sheath structure to the core yam strength. The influence of the twist level was also checked LIP on the relationship between the core-sheath structure and the yarn strength. Results turned out that the core-sheath weight ratio had influence oil the tensile properties of the ring core-spun yams in different ways according to the core filaments used for the yam. Increasing the twists yielded a monotone decreasing strength for the aramid and the basalt core yams, while the PET core yams showed almost unchanged strength, which could be ascribed to the extensional property of the filaments.