| Polysulfonamide (PSA), our own-patented synthetic fiber, is a new kind of high temperature resistant synthetic fiber. It has good performance of fire retardant, flame resistance, thermal stabilization and resistance to cauterization. It's LOI reaches 33% and it has filled up the blank of thermal resistance fiber that can resist the temperature above 250 ℃ in China. The main application fields of PSA are protection products, filtration products, insulation products etc. So we have a bright prospect of PSA fiber with the market of 2000 tons annually.However, the problem is that PSA yarn has more hairiness than other yarn, especially the hairiness of longer than 3 mm. For example, nearly 5 times of T/R blended yarn for the hairiness that longer than 3 mm and more than 8 times for the hairiness that longer than 5 mm. The problem of yarn hairiness is one of the key factors that devaluate the PSA yarn quality. This problem is also one of the obstacles of PSA industrialization in the world. In order to shake off the high performance fibers dependence on other countries, we should devote ourselves to the study of PSA fiber significantly.To study the PSA yarn hairiness, we should start from the study of the fiber itself. For this reason, this study started with the test and study offiber properties that affect the yarn hairiness. The result of the study shows that PSA fiber is a kind of chemical fiber with medium strength at breakage and elongation, but with a very high module. Its elongation is 25.4% higher than cotton fiber and its humidity regain is very high, reaches 6.2%. And the speed of moisture absorption is very high, which reached the moisture absorption balance at about 80 minutes. It owns a very poor crimp recover with normal crimp and crimp rate. Friction coefficient of PSA yarn is somewhat low and the Volume Specific Resistance (VSR) is too high, reaches 1016 ^ .cm.It is regarded that the high module, low friction coefficient and high volume specific resistance (VSR) are the three key factors that cause the yarn to be more hairy except for the ring spinning mechanism. In this paper, a model of statistic field and the theory of finite element are used to analyze the force and position of the hairiness fiber.The properties of PSA fiber are determined by its molecule structure. However, practical pre-treating, well controlled humidity and temperature of the processing environment, practical technology measures and optimized technology parameters can not only decrease the yarn hairiness significantly, but also can smooth the spinning processing practically. It is regarded that antistatic agent SN, a kind of positive ion antistatic agent, is practical for PSA fiber pre-treating. The optimum humidity in pre-spinning workshop should be 70% and the humidity in spinningworkshop should be 65%. In this paper, the study on the influence of spinning parameters to PSA yam hairiness was made by experiments of quadric rotational regression. Three key spinning parameters were optimized and proved to be effective in reducing the PSA yam hairiness. The optimized parameters result is: twist multiplier=61.3, break draft=1.147, spindle speed=1080 r/min. All these parameters will be a reliable reference for the factories.In order to explore whether modem spinning technology is practical in reducing the PSA yam hairiness, Sirospun technology was applied for experiments and was proved to be practical in decreasing the yam hairiness, especially to the hairiness of longer than 3 mm. And for the determined experiment, the best distance of supplied roving space is 11 mm for the stability of the convergence point and the best yam quality.WANG Fuqiu (Textile Engineering) Supervised by ZHU Sukang...
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