Sheath-slippage resistance and other properties of polyester-viscose MJS core-spun yarns

Abstract

The impact of some process variables on sheath-slippage resistance and other properties of viscose-covered polyester filament MJS core-spun yarns has been studied. It is observed that the air-jet spinning can be used for producing core yarns after optimizing process parameters. A relatively higher first nozzle pressure is advantageous for improving sheath-slippage

resistance. The use of higher spinning speed and wider condenser markedly improves the tenacity, breaking extension, initial modulus and sheath-slippage resistance but adversely affects the yarn hairiness, mass irregularity and flexural rigidity. Such decline in the properties at higher spinning speed is, however, more marked in the fine yarns than in coarse yarns. On the whole, MJS core yarns have hairiness and irregularity characteristics similar to those of 100% viscose yarns, but the mechanical properties of these yarns are better than those of pure viscose yarns, obviously due to the presence of a strong core material.