Why does a cashmere sweater have a heavier pilling than a wool sweater

Why does a cashmere sweater have a heavier pilling than a wool sweater?

Cashmere has shorter fiber length and lower strength than wool, and the scales covered by the fiber surface are thin and close to each other. Because the cashmere fiber has fewer curls than wool and the friction coefficient is smaller than wool, cashmere fibers are smoother, the cohesion between fibers is worse, and the shrinkage is worse than wool, but the cashmere feels soft and smooth. The static electricity generated by friction will open the scales, entanglement between the fibers, and kinked together to form a hair ball. Because the cashmere fibers are relatively thin and cannot be descaled, but high quality wool material is processed in this process to reduce the pilling. Therefore, pilling will inevitably occur after hard objects and long-term friction.