Effect of Yarn Wetting on Some Physical Properties of Polyamide 6 False-Twist Textured Yarn

Abstract

In the present work, the effect of water on some physical properties of false-twist textured polyamide 6 yarn was studied. A laboratory false-twist texturing machine was modified by a water bath in order to wet the feed yarn before entering the texturing zone. Polyamide 6 yarn was textured at the texturing speeds of 51, 85 and 119 m/min and twist levels of 2165, 2559 and 2954 turns per meter, with and without water bath. The properties of textured yarn in the aspects of crimp characteristic and tensile behavior were determined. The properties of wet textured yarn were also compared with normal (dry) textured yarn. The results show that the tensile and crimp property values of wet textured yarn are lower than those of normal (dry) textured yarn. Wetting of feed yarn changes the stability of twisting–untwisting process in false-twist texturing, and it seems that some fraction of twist is maintained in the final textured yarn. This residual twist results in non-bulky appearance of wet textured yarn.