End Breaks in the Spinning and Weaving of Weavable Singles Yarns

Abstract

An end break will occur in spinning when the tension in the balloon exceeds the strength at the weakest point in the yarn, which is at the point of twist insertion and before the fibers are fully twisted together. Other than gross faults such as slubs, the cause of an end break is generally a very thin place, the incidence of which can be estimated from the mean linear density of the yarn and its variance. A good correlation was found between the end breakage rate and the irregularity (CV%) of the yarn, which appears to be independent of yarn count. The tenacity of the yarn at a break was estimated to be only about 1.85 g/tex. For wool yarns which are woven in the warp as singles, end breaks in spinning effectively remove those thin places which are likely to break in warp ends during weaving. It is recommended that such yarns be spun at high speed to remove those short, very thin places which might not be detected in clearing, but which may fail in weaving.