THE STUDY OF IRREGULARITY ELONGATION OF YARNS OF WOOL IN MIXTURE WITH SILK USING THE USTER® TENSOJET 4 MACHINE

Abstract

The purpose of the study is to assess the irregularity elongation of wool yarn in a mixture with silk with the smoothness and torque of 470 Nm 34/1 twists / m, for knitted products. The study was conducted on two groups of yarns, batch 1 came from South Africa, and batch 2 from Asia, which was painted. In both groups there was 75% wool yarn and 25% silk. The measurements were carried out using the USTER® TENSOJET 4 machine, the analysis being performed on ten samples from each batch of yarns. During the mechanical processing and also during the use of textiles, the yarns are solicited by tensile forces, but most often by forces inferior to tearing forces. To highlight the behavior of yarns during strains to smaller stresses than those causing tearing itself, we must examine the stress-elongation diagrams and the irregularity regarding stress (tearing load and elongation to tearing). These stress characteristics have a major influence on deformability characteristics, dimensional stability, knitted products for which these yarns are intended. Thus it was found that the yarns from Asia, have a higher quality from the point of view of the tension proprieties having a lower irregularity defect from this point of view, contributing to obtaining a higher quality of the knitted product with a better dimensional stability than the products obtained from South Africa.

Keywords

• yarns
• tensile properties
• fineness
• irregularity