Clarification of the Stretching Process of Newly-Developed Open-End Rotor-Spun Hollow Yarn

In order to make effective use of vegetable fibers and produce cotton spun yarn with novel functional properties, 100% cotton open-end rotor-spun hollow yarn was produced and the stretching process of the yarn was clarified. The results were as follows: (1) In the extending process, as the length of the thicker part of the yarn with the smaller level of twist increased, the thicker part of the yarn became the thinner part of the yarn and a redistribution of the twist level also occurred with the straightening of the coiled structure; (2) In the recovering process, as the length of yarn decreased, the thinner part of yarn with the greater twist level was fixed with the reconstruction of the coiled structure; (3) When the extension of the hollow yarn was greater than the elastic limit of the component yarn, the yarn after recovering had an increased length and/or a slack as residual extension in the original length of yarn; and (4) In terms of both the dividing of yarn extension and the redistributing of yarn twist, the double-coiled structure was superior to the single-coiled one.