Usage of elastane yarn in circular knitting machines


Thesis Type: Postgraduate

Institution Of The Thesis: Bursa Uludağ University, Fen Bilimleri Enstitüsü, Turkey

Approval Date: 2007

Thesis Language: Turkish

Student: Serkan Tezel

Supervisor: YASEMİN KAVUŞTURAN

Abstract:

Elastane yarns have made a great progress with in the last 45 years because of their ability to improve their elasticity and comfort properties. There has been a significant increase in elastan yarn producers parallel to the increase of the demand for fabrics containing elastane yarns. Elastane yarns which are produced as an alternative for the yarns belong to the well-known elastane yarn firms; have found a place in knitting sector because of their suitable prices. In this study, two groups of experimental works have been represented in order to investigate the effects of the brand factor on stress strain behaviour of elastane yarns and structural properties of the knitted fabrics. In the first section of the study, the stress strain behaviour of the 6 different brand elastane yarns has been tested with different test devices in order to see the effect of brand on breaking elongation % behaviour, elongation % under the constant stress, stress under the constant elongation % and frictional behaviour. And the comparisons have been made with the statistical methods. In the second section of the study, 36 RL (single jersey) knitted fabrics have been produced with 4 different elastane yarns, 3 different base yarn feed ratio and 3 different elastane yarn feed ratio. Sample fabrics were knitted with cotton yarn used alone in one course and with cotton / elastane yarn used in the other course. The experimental work was aimed at determining the effect of the factors on the wale density, course density, loop density, loop length of the base yarn, loop length of the elastane yarn, areal density, thickness, bursting strength, air permeability, growth and stretch and comparing the results with statistical methods.