Except for pilling caused by improper wearing or friction with hard objects, some loose fibers will fall off or tangled together after the clothes are worn several times, and form pilling, which is completely normal. Even the best quality cashmere sweaters will have slight pilling within a moderate range when they are first worn.
Due to the particularity of the fiber itself, the reasons for the pilling of cashmere products are as follows:
(1) Fiber length: The pilling degree of the fabric woven by longer fibers is lighter than that of the fabric woven by shorter fibers; because there are fewer fiber heads per unit length, there are fewer fiber ends exposed on the surface of the yarn and fabric. The length of cashmere fiber is 35 to 45 mm, and the length of wool fiber is 70 to 140 mm.
(2) Fiber fineness: thicker fibers are less prone to pilling than thinner fibers. The yarn spun from crude fiber has fewer fibers per unit area, and fewer fiber ends exposed on the surface of the yarn and the fabric; in addition, the thicker the fiber, the more rigid, the fibers erected on the surface of the fabric are not easy to entangle into balls. The fineness of cashmere is significantly smaller than wool.
(3) The degree of crimp of the fiber: the crimp of the fiber is large, the cohesive force between the fibers is large, the friction increases, the fiber is not easy to free to the surface of the fabric, and it is not easy to pilling. Cashmere has less curl than wool.