Effect of chemical texturization on physical and relaxation properties of jutepolypropylene ply yarns

Abstract

<span style="font-size: 14.5pt;mso-bidi-font-size:8.5pt;font-family:" times="" new="" roman","serif""="">Two-, three- and four-ply jute-polypropylene (70:30) yarns have been prepared and chemically texturized using 18% (w/w) NaOH solution. It is observed that as the number of ply increases, the tenacity, breaking elongation, work of rupture, packing factor and flexural rigidity of untextured yarns improve. Chemical texturization of ply yarn brings about moderate increase in tenacity along with considerable improvement in bulk. However, after texturization, the tenacity, breaking elongation, work of rupture and packing improve while the initial modulus and flexural rigidity are adversely affected with the increase in number of ply. As revealed by the stress relaxation and cyclic loading of ply yarns, the stress decay and permanent set increase with the increase in number of ply at low deformation level, while at high extension level, the stress decay

<span style="font-size: 14.5pt;mso-bidi-font-size:8.5pt;font-family:" times="" new="" roman","serif""="">decreases. In the textured yarn, the stress decay and permanent set are always higher as compared to that of their untextured counterparts. Wetting of ply yarn results in lowering of tenacity, modulus and flexural rigidity and enhancement of elongation- at-break, work of rupture, stress decay and permanent set values.

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