1. Incorporation of nylon multi-filament as the core component makes the yarns stronger and more extensible. 2. Core-spun yarns have better uniformity of strength than the parent yarns. However, the response of breaking extension CV% is different for cotton and viscose rayon yarns. The breaking extension CV% of cotton yarns increases with the incorporation of nylon core whereas it decreases for viscose rayon yarns. 3. Yarn tenacity reduces with the increase in yarn breaking time. But the breaking extension first increases when the breaking time is increased to 20 seconds and then decreases or remains unchanged when the breaking time is further increased to 30 seconds. 4. The tenacity and breaking extension of core-spun yarns increase at a shorter specimen length. 5. Abrasion resistance of DRF yarns is better than that of SRF yarns. Cotton yarns show higher abrasion resistance than their viscose rayon counterpart.
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