Tensile Behaviour of Core-Spun Yarns

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Core-spun yarns incorporating a textured nylon multifilament core were prepared by introducing the multifilament core along with a drafted ribbon of fibres as the latter entered the nip of the front rollers of a ring frame. The geometrical disposition of the core was altered by changing the twist multiplier, pre-tension and the type of feeding of the sheath material, and the effects of these changes on the tensile properties were evaluated. Comparison of the stress-strain curves for the core-spun yarns with those for the continuous filament and cotton yarns of the same counts spun under identical conditions highlighted the behaviour of the components in a core-spun yarn undergoing strain. The contribution of the cotton components to core-spun yarn strength was assessed by the study of cotton fibre breakage at various levels of yarn strain. The results from the Instron tensile tester reveal the mode of strain distribution along the length of the yarn. The process of rupture of the core-spun yarns has also been studied in detail. The development of the spinning processes.</span>