Study On Dimensional Stability Of Colored Cotton Knitted Fabric

Under the theme of "green textiles", the research and development of natural colored cotton is very popular in today's international textile industry. Natural colored cotton is a new cotton variety fostered by using bio-genetic engineering and other high-tech means. Through natural biological enzyme treatment, natural colored cotton can have lasting natural color, soft texture, wearing comfort. It is green, healthy and fashionable, which will be the best textiles in the 21st century. The industrial development of natural colored cotton is the inevitable result of coordination between environmental protection and economic development. It is the urgent needs of both home and abroad market, and thus it has a broad prospect.However, in colored cotton development process, a number of shortcomings of colored cotton products were found, such as chromatography monotonous, pigment and color lability and poor colored cotton fiber quality. In particular, the poor dimensional stability has great effect on the overall quality of colored cotton clothing products. In this paper, the topics from natural colored cotton fabric weaving techniques, blended with different materials, adding PTT interwoven to the use of biology enzyme and thermosetting were discussed to investigate its dimensional stability and their influence on other apparel properties.Firstly, the selected materials were tested and analyzed. The results showed that compared with the white cotton yarn, the colored cotton yarn had lower tenacity, more surface hairiness and greater shrinkage rate. Meanwhile, it was found that the quality of natural colored cotton yarn could be improved by blending with other renewable fiber or superfine polyester.Secondly, the influence of woven fabric compactness on the shrinkage rate was discussed. Meanwhile, the influence of the different blended ratio of the colored cotton and white cotton fabric on the dimensional stability was also analyzed. It was found that the higher the density of the same woven fabric, the better of fabric dimensional stability; the higher content of natural colored cotton, the greater of the shrinkage rate.Thirdly, the influence of blending the natural colored cotton with renewable fibers or superfine polyester fiber on the dimensional stability was studied. Under the same weaving techniques, the fabric got better dimensional stability after blending with Modal fiber, Tencel, Richcel and superfine Polyester fibers in particular. After that, natural colored cotton was intertwined with PTT, and the dimensional stability was measured. It was found that PTT intertwined with colored cotton fabric had reduced shrinkage, and shrinkage was decreased with the increasing trend of PTT. However, the air permeability became worse.Biology enzyme finishing was employed afterwards. The fabric shrinkage was measured. Through analysis, it was found that the Biology enzyme finishing can reduce the fabric shrinkage and improve the dimensional stability. It could also improve the fabric handle, anti-pilling, capillary effect and other apparel properties. Finally, the optimum thermosetting conditions were obtained by orthogonal test and rank analysis.