NOPR Collection:

Textile preforms for advanced composites

Wed, 01 Sep 2004 00:00:00 GMT

Title: Textile preforms for advanced composites Authors: Ogale, Vinayak; Alagirusamy, R Abstract: Textile preforming operations playa key role in most of the composite manufacturing processes. The basic textile yarn and fabric forming processes have been modified and developed to a significant extent to meet the increasing demand from the composite manufacturing sector. Apart from being cost effective technology employed for obtaining different fibre orientations and near net shapes, textile preforms also lead to improved mechanical properties of the resulting composites in certain aspects. The developments in the field of textile performing along with their advantages and disadvantages have been critically reviewed in this paper. Page(s): 366-375

Characteristics of degummed ramie fibre and its cotton blended yarns

Wed, 01 Sep 2004 00:00:00 GMT

Title: Characteristics of degummed ramie fibre and its cotton blended yarns Authors: Ahmed, M; Chattopadhyay, S K; Chaphekar, A K; Gaikwad, R S; Dey, S K Abstract: A two-stage degumming method has been used to reduce the gum content from 20-30% to 2-3% in ramie fibre. The chemical composition and fibre properties of raw, degummed and bleached ramie fibre samples have also been studied. Although the surface property of ramie fibre improves on degumming and further bleaching, the fibre bundle strength and blended yarn quality are found to deteriorate. Page(s): 362-365

Frictional and mechanical properties of mercerized ring- and rotor-spun yarns

Wed, 01 Sep 2004 00:00:00 GMT

Title: Frictional and mechanical properties of mercerized ring- and rotor-spun yarns Authors: Tyagi, G K; Goyal, Ashvani; Dhanda, K Abstract: The response of cotton ring- and rotor-spun yarns to mercerization treatment has been investigated. It is observed that the caustic mercerization causes major changes in the mechanical and frictional behaviour of yarns, though the magnitudes of changes are different for different ring- and rotor-yarns, depending on the process parameters used. Both mercerized ring and rotor yarn s display higher knot and loop strength and lower extensibility, elastic recovery and surface friction than the corresponding unmercerized yarns. Mercerization is an effective means of reducing hairiness and twist liveliness of both types of yarn. Page(s): 357-361

Factors influencing the abrasion properties of chenille yarns

Wed, 01 Sep 2004 00:00:00 GMT

Title: Factors influencing the abrasion properties of chenille yarns Authors: Ortlek, H G; Ulku, S Abstract: The effect of material type, pile length and twisting rate on the abrasion properties of chenille yarns has been studied. Twenty seven different chenille yarns have been produced using three different twist levels (800, 850 and 900 twists/m) and three different pile lengths (0.7, 0.8 and 1.0 mm) from three different materials (cotton, viscose and acrylic) and then used as weft yarn for producing upholstery fabrics. It is observed that the malarial type, twist level and pile length have significant effect on the abrasion resistance of chenille yarns. The abrasion resistance of cotton chenille yarns is found to be higher followed by the acrylic chenille yarns and viscose chenille yarns. Page(s): 353-356