Influence of process variables on characteristics of modal siro-spun yarns using Box-Behnken response surface design

Abstract

The influence of process variables on characteristics of modal siro-spun yarns has been studied using Box-Behnken response surface design. The characteristics of these yarns have been evaluated and compared with those of equivalent double-rove spun yarns. It is observed that the increase in strand spacing from 6 mm to 10 mm increases the unevenness and

decreases the hairiness, strength and extension of modal siro-spun yarns. The traveller mass and spindle speed show varying effects on characteristics of siro-spun yarns. Taking the effects of all the three experimental factors into account, it has been found that the yarn unevenness is minimum and elongation is maximum at lower levels of factors while the hairiness is minimum a t their higher levels. The yarns exhibit maximum tenacity and fewer imperfections a t middle levels of the factors. Hence, the strand spacing of 8 mm, traveller mass of 1/o and spindle speed of 17000 rpm are found to produce siro yarns of nominal count (30 tex) with optimum quality. Further, the siro-spun yarns are found to be relatively inferior in respect of unevenness and superior as regards the hairiness when compared with the equivalent double-rove spun yarn.