| Since 1950s of last century, acrylic fiber has been widely used because of its excellent properties, such as its bulkiness, warmth retention, soft handle, and easy dyeing, etc. However, if fabrics made of acrylic fibers subject to much friction, the surface of fabrics is easily pilled. This phenomenon will influence the appearance and wearing comfort, so as to limit its use in high-grade products. In the 1970s of last century, there were patents coverage about anti-pilling acrylic aboard. The quality has been improved and an industrial chain from fiber to fabric has been formed. In recent years, anti-pilling acrylic has quietly imported into the textile processing sector in China and widely used, which strikes against domestic acrylic market. In order to enhance added value of products, the acrylic department of Shanghai petrochemical Co., Ltd. has developed domestic anti-pilling acrylic fibers with good pilling resistance. However the basic research about the properties and product development of domestic anti-pilling acrylic fiber is rare. In this thesis the structure and properties of domestic anti-pilling acrylic fiber, relationship between processing parameters and yarn properties, the pilling properties of fabrics, as well as, other fabric performance are investigated systematically in order to give a reference to the production or the theoretical research.Firstly, on the basic of the theory about the dynamic model of fabric pilling, the ways which can decrease pills are analyzed. It provides some ideas about producing fiber, yarn and fabrics.Secondly, by the means of scanning electron microscope, and X-ray diffraction analysis, the crystalline structure, orientation structure and morphology structure of domestic anti-pilling acrylic fiber were investigated. The physical and chemical properties of fiber were also analyzed. The results showed that:Because of the adjustments on spinning processing parameters, the domestic anti-pilling acrylic fiber, compared with ordinary acrylic fiber, has more holes or slight grooves on its cross-sectional or longitudinal structure, and the fiber's orientation and morphology structures slightly decrease. These are beneficial to fabrics' anti-pilling performance. Thirdly, orthogonal experimental design method is applied to investigate relationship between blending ratio of the domestic anti-pilling acrylic fibers blended with cotton & twist magnitude and blended yarn's properties. Two kinds of yarns of 25tex and 20tex were spun and their properties were measured. The results showed that:The properties of both yarns have similar general trend. With the increase of domestic anti-pilling acrylic fiber in yarn, the breaking strength of blended first decreases and then increases, there is a critical breaking strength of blend ratio; and the elongation of the yarn increases; and the evenness CV value of yarn shows a downward trend.Fourthly, the blended yarns were knitted into fabrics by hosiery machine and the pilling performances were tested by Martindale pilling tester. The relationship between fabrics processing parameters and pilling performance was optimized. The results showed that:Fineness of the yarn and twist magnitude have an impact on fabric's pilling performance. Taking all factors into consideration, the optimal process parameters are:(1) Blended yarn of 25tex, its blended ratio is 50/50 and twist magnitude is 750 twists/m; (2) Blended yarn of 20tex, its blended ratio is 50/50 and twist magnitude is 680 twists/m.At last, the ventilation property, pliability and fabric transient cool feeling of blended fabrics were tested and investigated. The results showed that:With the increase of domestic anti-pilling acrylic fiber in yarn, the ventilation property of the fabric increases; and the pliability and fluffy of fabric increase. Because of anti-pilling acrylic's low moisture absorption and fiber's surface grooves, fabric transient cool feeling decreases with increasing anti-pilling acrylic fiber content.
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