Dyeing of the knitting fabric including elastane fibres in various mixtures and their fastness features

ABSTRACT MsC THESIS DYEING OF THE KNITTING FABRIC INCLUDING ELASTANE FIBRES IN VARIOUS MIXTURES AND THEIR FASTNESS FEATURES Yalçın YEŞİL DEPARTMENT OF TEXTILE ENGINEERING INSTITUTE OF NATUREL AND APPLIED SCIENCE UNIVERSITY OF ÇUKUROVA Supervisor : Assist. Prof. Dr. Emel Ceyhun SABIR Yıl : 2003, Sayfa : 261 Jury : Assist. Prof. Dr. Emel Ceyhun SABIR Prof. Dr. R. Tuğrul O?ULATA Assist. Prof. Dr. Mesut BAŞIBÜYÜK Elastane has an important place in textile sector due to its comfort and functionality. Yarn and fabric production and finishing for elastane have quite different features from one another and the sector faces innovations constantly. In this study, some knowledge about elastane fibre production, the production of yarn including elastane, the finishing of the elastane fabrics is given, and the colourfastness for elastane fabrics is stated in detail. For testing colourfastness, nylon, polyester and elastane yams were knitted in different proportions. Knitted fabrics were dyed in laboratory conditions. After that, washing processes were carried out for nylon by using various fixators in different proportions, and for polyester by using various reductive washing materials in different proportions. After washing processes, washing, chlorinated water, seawater, water, sweat and friction fastness tests were carried out on fabrics. Some selected findings obtained from these tests are presented below. Generally, all fabrics including no elastane have a better fastness than fabrics with elastane. As a result of fastness tests, the highest fastness values were determined on water fastness tests, and the lowest fastness values were determined on washing and chlorinated water tests. The fastness of the fabrics with nylon fibres was higher than those with polyester ones. An increase in the elastane amount of fabrics led to a decrease in colourfastness. It was determined that using carrier on dyeing the fabrics with the mixture of polyester and elastane caused a decrease in colourfastness. It was also determined that colourfastness were decreased when anionic and cationic fixators were both used on washing the fabrics with nylon fibres after dyeing process. Moreover, it was found out that the fastness became higher when stabilized hydrosulphite was used instead of normal hydrosulphite on reductive washings after dyeing of the fabrics with polyester fibres. This study should be applied to other fabric samples with different elastane proportions. Key Words : Elastane, Colourfastness, Nylon-Elastane Fabric, Polyester-Elastane Fabric VII