Evaluation of Classimat Faults for Their Performance in Weaving

The weaving performance of a yam is mostly decided by its grey yam properties and the treatment it receives in the processes subsequent to spinning. This paper presents a study of the effect of the magnitude of yam faults (length and cross section) and of sizing on their performance in weaving. The results showed that particularly C₃, C₄, and all D Classimat faults, even after sizing, have lower strength, elongation, and abrasion resistance. The presence of these faults introduces a very high frequency of low strength, elongation, and abrasion threads into the yam, which in turn are prominent sources of warp breaks. When subjected to tensile load, most yams broke at or in the vicinity of a fault. The frequency of such yarn breakages increased with fault length and cross section.