Knitted sweaters of high size fabrics are generally more compact, so low size fabrics are easier to pilling than high size fabrics. Smooth surface of the fabric is not easy to pilling, uneven surface of the fabric is easy to pilling. Accordingly, the resistance that fat spends fabric, fabrics of common design and color, rib fabric, plain knit is wool rises pilling sex is increased gradually. [BR /] 2. Dyeing and finishing process: The pilling resistance of yarns or fabrics after dyeing and finishing will have a great influence, which is related to dyes, auxilants and dyeing and finishing process conditions. Yarns dyed with Hank yarns are more likely to pilling than yarns dyed with loose wool or woolen yarn; Fabrics dyed in sweaters tend to pilling more easily than those dyed in yarns; After finishing with resin, the resistance to pilling will be greatly enhanced. The scale is a main characteristic of wool fiber, it makes wool fiber has downsizing, so the essence of anti-shrink finishing is to handle the scale, make it weaken or lose the directional friction effect. [BR /] 3. Chemical agents are mainly used to interact with the scales to damage and soften them; Or the use of resin uniform diffusion in the fiber surface, forming a film. Thus effectively limited the role of scales, wool fibers lose the ability to shrink, to achieve the purpose of shrinkage. [BR /] 4. Viscose silk fabric (human silk) : The silk is glossy but not soft. It has bright colors and feels smooth, soft and strong drape, but not as light and elegant as real silk. After hand knead silken surface loosen, have crease, and restore slower. He was hoarse when torn. After wetting the weft and warp yarn, it is easy to pull. [BR /] 5. Pure cotton cloth: it has soft luster, soft feel, poor elasticity, and easy to fold. After knead cloth tightly with the hand loosen, visible crease obviously, and crease is not easy to restore original state. Pull out a few warp and weft from the edge of the cloth and twist to see the length of the fibers.