THE ASPECT OF TENSILE STRENGTH OF TWISTLESS-YARN FABRIC

Abstract

Recently, several kinds of twistless-yarns (Tex-Ja Yarn, Bob-Tex Yarn, T. N. O. Yarn etc.) and their fabrics have been developed. This paper reprts on the breaking strength of twistless-yarn fabrics. The twistlessyarns (T0) were produced by means of the apparatus shown in Fig. 1. The conventional yarns (T2.5 and T6.5) of twist factors 2.5, 6.5 were produced by ring frame. They were then woven into fabrics and washed to remove the adhesive. These fabrics are named, T0 Fabric, T2.5 Fabric and T6.5 Fabric respectively. Their loadelongation curves are shown in Fig. 6. Defferent yarn densities of the T0 and T2.5 Fabrics are shown in Table 2, and their load-elongation curves are shown in Fig. 7 and Fig. 8. The breaking strength per yarn in fabric are given in Fig. 9 and Fig. 10, for comparison.When the twistless-yarn fabric is elongated, compressive forces work at the intersecting points of the yarn in the fabric, and therefore inter-fiber frictional force increases. From this point of view, the compressive forces at one of the intersecting points of the yarns in fabric were calculated. (formula (3) (4) and Fig. 15) Futhermore, from the relationship between the inter-fibre frictional force and the yarn strength, the breaking strength per yarn in the fabric was calculated and the calculated values are compared with the experimental data.