Influence of singeing and dyeing on combed yarn and fabric characteristics

Abstract

The presence of hairs on surface of yarn affects the appearance and characteristics of yarns and the fabrics. Ring spun yarn has hairy fibres on its surface which is initially developed at the exit of front roller due to fleeing of edge fibres from twisting action. In weaving and knitting, hairiness causes yarns to break and also results hazardous fibrous dust and fly generation. The hairiness increases pilling tendency of fabric and that results unsightly fabric appearance. In dyeing, yarn hairiness leads to differential dyeing effect. Hairiness of yarn increases while passing the yarn through number of guiding elements in post-spinning, weaving and chemical processing. The protruding fibres entangle themselves due to rubbing of yarn with elements of the machines and forms thin, thick places and neps. Hairy fibres from yarn surface can be easily removed by burning them by singeing process. Hence, the removal of hairy fibres from the yarn by the singeing process after cone winding reduces the chance of creation of yarn faults during further processes. It is the normal practice in the industry to increase the noil to be removed at comber, up to a certain level, to reduce the imperfections and increase the tenacity and uniformity of yarn at ring bobbin stage. However, the hairy fibres present in the yarn increase the imperfections when they are rubbed against number of guiding elements in subsequent processes. It is now suspected whether lower imperfections achieved at ring bobbin stage, by removal of higher noil% at the comber, is maintained at same level during the post spinning and wet processing operations or not. newline newline newline