Study On The Properties Of Blended Textiles Composed Of Soybean Protein Fiber And Cotton Fiber

In this dissertation we studied the influence of yarn twist, blending ratio, yarn count and yarn construction to the properties of soybean /cotton blended yarn such as evenness and tensile property and the effect of blending ratio and yarn construction on wearing characteristics of soybean /cotton blended fabric.The soybean protein fiber, born in the 21st century, is the only chemical fiber developed by Chinese researchers by far. It has many fine performances such as excellent moisture vapor transmission, comfortability, lofty, bulk, light specific density and high heat retention. Its appearance and handle is as good as cashmere while its subdued luster and drape is as beautiful as silk. Though we have known some of its properties, we still need to study the performance and structure of the textile production of soybean protein fiber systematiclly. Firstly, we tested the evenness, hairiness, and tensile property of soybean /cotton blended yarn of different twist, blending ratio, count and spinning system. Through comparing and analysis, we got the results as following. (1) Evenness. The evenness of soybean /cotton blended yarn with same twist, count and yarn construction increased initially and then decreased with the increasing percentage of soybean protein fiber; Generally speaking, the evenness of Sirospun yarn was better than that of ring yarn with same twist, count and blending ratio; 32 English count yarn was better than 45 English count yarn with same twist factor, blending ratio and spinning system. (2) Hairiness. The hairiness of soybean /cotton blended yarn with same twist, count and yarn construction increased gradually with the increasing percentage of soybean protein fiber; the evenness of Sirospun yarn was better than that of ring yarn with same twist, count and blending ratio; 32 English count yarn was worse than 45English count yarn with same twist factor, blending ratio and spinning system. (3) With the increasing percentage of soybean protein fiber, the tensile strength of soybean /cotton blended yarn with same twist, count and yarn construction rose initially and then fell, and its critical twist factor declined. The critical twist factor of low count yarn was higher than that of high count yarn with same twist factor, blending ratio and spinning system; While for same twist factor, blending ratio and count blend yarn, the critical twist factor of ring spun yarn was higher than that of Sirospun yarn. The higher the count was, the bigger the difference was. The tensile strength of soybean /cotton blended yarn improved initially and then declined with the increasing percentage of soybean protein fiber, with the exception that the tensile strength of the 45 count blended yarn decreased all long, when the percentage of soybean protein fiber was low and middle, for 32 count blend yarn under the same twist and blending ratio, the tensile strength of ring spun yarn was higher than that of Sirospun yarn. But when the percentage of soybean protein fiber became high, ring spun yarn was lower than Sirospun yarn; for 45 count blend yarn, Sirospun yarn was higher than ring spun yarn. Under the same twist factor and blending ratio, the tensile strength of 32 count ring spun yarn n was higher than that of 45 count ring spun yarn, while for 45 and 32 count Sirospun yarn, the result was opposite.The properties of soybean/cotton blended fabric, including the drapability, credibility and pilling were measured. The influence of blending ratio and yarn spinning system to the blended fabric were studied and the conclusion wad reached: Basically, with the increase of the proportion of the soybean protein fiber, the drape coefficient would increase; the drape coefficient of ring spun fabric was higher the that of Sirospun fabric with the same blending ratio as the proportion of the soybean protein fiber was low and middle, and Sirospun fabric was higher than ring spun fabric asthe proportion of the soybean fiber was high. With the increase of the proportion of soybean protein fiber, the credibil...