NOPR Collection:

Effect of Twist and Fibre Denier on Characteristics of Polyester-Viscose Core-spun Yarns

Mon, 01 Dec 1986 00:00:00 GMT

Title: Effect of Twist and Fibre Denier on Characteristics of Polyester-Viscose Core-spun Yarns Authors: Tyagi, G K; Ghosh, Amitabh; Girdhar, Praveen; Agarwal, Neeraj Abstract: The effect of sheath-fibre denier and twist on the characteristics of core-spun yarns, with a constant polyester core, was studied. Core-spun yarns with the same core component but with finer-denier viscose sheath fibre gave a higher strength and an overall higher yarn quality index. Alteration of twist did not affect the number of neps, which however decreased with increase in fibre denier. Thick places increased with increase in fibre denier. Flex abrasion resistance decreased with decrease in twist, but was higher for yarns spun with finer-denier sheath fibre. Page(s): 220-224

Distribution of Fibres in Cross-section of Rotor- and Ring-spun Yarns and Their Strength

Mon, 01 Dec 1986 00:00:00 GMT

Title: Distribution of Fibres in Cross-section of Rotor- and Ring-spun Yarns and Their Strength Authors: Ishtiaque, S M Abstract: The nature of fibre migration, the number of fibres in yarn cross-section and the factors that influence the strength of rotor and ring-spun yarns have been studied. Rotor yarn comprised 15%less fibres in yarn cross-section than the corresponding ring yarn. Fewer fibres in yarn cross-section in rotor yarn result in lesser yarn strength. Low values of stress-strain show up the limitation in the spinning of fine counts on a rotor-spinning machine. Page(s): 215-219

Radial Packing Density of Rotor- and Ring-spun Yarns

Mon, 01 Dec 1986 00:00:00 GMT

Title: Radial Packing Density of Rotor- and Ring-spun Yarns Authors: Ishtiaque, S M Abstract: The radial packing density of rotor-spun yarn was measured on the basis of the theory reported earlier by the author [Indian J Text Res, 11 (1986) 26]. The effect of yarn twist and count on the fibre packing density of rotor-spun yarn in comparison with that of ring-spun yarn was studied. The packing density of both the yarns over the yarn cross-section was not uniform and increased with yarn twist. In rotor yarn it was higher near the yarn axis and less towards the outer surface of yarn in comparison with that of ring-spun yarn. The packing density of rotor-spun yarn was less than that of ring-spun yarn, which is one of the causes of the lesser strength of rotor-spun yarn. For the same material and twist coefficient, the packing density of coarse yarn was less than that of finer yarn. Page(s): 208-214

Scanning Electron Microscopic Studies on Jute Yarn: Effect of Twist on Surface Structure

Mon, 01 Dec 1986 00:00:00 GMT

Title: Scanning Electron Microscopic Studies on Jute Yarn: Effect of Twist on Surface Structure Authors: Ray, P K; Sengupta, P; Das, B K Abstract: Scanning electron microscopic studies of jute yarns of different twists and counts showed that at low twists, all the filaments in the yarn did not lie in the direction of twist; as the twist gradually increased, the filaments took up the direction of the twist and made the yarn structure compact. Although some of the jute filaments making up the yarn suffered various types of damage during processing, increased damage like surface peeling, cracks and, in some cases, complete fracture of surface filaments in the yarn of higher twist took place. At lower twists the effect of carding on the filaments was predominant, and at higher twists both carding and twisting resulted in damaging effects on the filaments. Page(s): 204-207