Study Of The Pretreatment Technology Of Flax & Silk Blended Yarn

With the development of science technology and the improvement of people's aesthetic view, the natural products and fabrics made by natural fibers are ardently favored by more and more people. Meanwhile, products made with flax and silk fibers are characterized with sanitary, ventilate and nature merits and welcomed in the international market.Compared with the sales record of the products made by blended yarns, the sales of clothes with only pure silk or flax are often fluctuated because of the property of the fiber. Therefore, the development of flax & silk yarn can enlarge the merits of the flax and silk, as well conceal their flaws. This new products can also add more values than pure silk or flax fabrics, and exploit the nature resources in China.Based on the understanding of the degumming and blending technology principle, dry spinning system is adopted. Flax fiber is firstly treated by sodium hydroxide to reduce its length, increase its finess and softness. By using mechanic method, the best test parameters are found. Then degummed flax fibers are further modified by epoxy-compound and high strength sodium hydroxide to improve its soft handle and high curliness. The effect is briefly described as follows:1) Under the premise that flax fiber's property should be suited for spinning system and be treated softly, reasonable degumming procedure should be adopted to get the best outcome. The result shows that the length decreases by 58%, the finess increases by 244% and softness increases by 90%.2) The epoxy-compound modification can develop a new chemical links between the chains of molecules, which will improve the softness and crimp recovery property of the flax fiber. The test of softness was carried out to find the best parameters of the procedure.3) The modification by high strength sodium hydroxide can cause more curliness and better softness. These improvements will bring better cohesion between the fibers during the spinning process, and better yam count.4) The yam specification and outlook effect given by the blended yarn spinning test has proved that the pretreatment of flax and silk fiber is crucial key point for the successful blending.