Effect of carding draft and sliver doubling on ring-spun yarn properties

摘要

1. With the increase in carding draft, the strength of sliver and roving decreases. Fibre extent, fibre overlapping extent in the yarn and yarn strength, abrasion resistance, elongation and flexural rigidity increase with in-crease in carding draft, while yarn unevenness, diameter and hairiness decrease. 2. Eight-sliver doubling gives higher sliver strength and higher roving strength than 6-sliver doubling. Ring yarn having 8-sliver doubling shows higher fibre extent, fibre overlapping extent and percentage of straight fibre in its structure than those having 6-sliver doubling. The same yarn shows higher yarn tenacity and flexural rigidity but lower elongation and hairiness than 6-sliver doubling yarns. No significant differences were found in yarn evenness, diameter and abrasion resistance in 6 and 8-sliver doubling yarns.