Effect of Lowering Twist Levels on Quality Parameters of Rotor Spun Cotton Yarn

• Published in: Mehran University Research Journal of Engineering and Technology Vol. 35; no. 3; pp. 425 - 430
• Main Authors: Ahmed, Farooq, Shaikh, Ghulam Yasin, Pathan, Ashfaq Ahmed
• Format: Journal Article
• Language: English
• Published: Mehran University of Engineering and Technology 01-07-2016
• Subjects: 100% Cotton; Cotton yarn; CVm; Elongation; Low Twist Multiples; Methodology; Microelectromechanical systems; Rotor Spun Yarn; Strength; Testing; Total Imperfection Index; Pakistan; Total Imperfection Index; Rotor Spun Yarn; Low Twist Multiples; CVm; 100% Cotton; Strength; Elongation
• ISSN: 0254-7821; 2413-7219
• DOI: 10.22581/muet1982.1603.12

Investigations were made to explore the influence of lowering twist level on quality characteristics of rotor spun yarn. Three levels of yarn linear density (i.e. 40, 35 and 30 tex) and five levels of twist (i.e. 700, 600, 550, 500, and 450) were employed during yarn spinning trials. Each twist multiple was investigated at all linear densities for tensile strength, elongation, total CVm (Coefficient of Mass Variation) imperfection index and hairiness. 100% cotton yarn samples were prepared on Reiter R-40 at rotor speed of 90,000 rpm. Determination of elongation, yarn strength, hairiness, mass variation, and total imperfections index was carried out on Uster Tensorapid-4 and Uster Tester-4 as per set standards of ISO standard test methods. Based on investigations it is established that yarn strength and elongation declined minutely (Insignificant) with lowering twist levels but still can be confidently used for knitting yarns. However, significant improvement in total imperfection index and marginal enhancement in CVm were experienced.