Chemical staple fiber is commonly known as "staple fiber" . The product obtained by cutting chemical fiber into a certain length after forming. It can be divided into cotton type staple fiber (commonly known as "artificial cotton"), wool type staple fiber (commonly known as "artificial wool") and medium length staple fiber (hereinafter referred to as "medium length fiber") according to the length of coarse and fine product. It can be pure spun on cotton, wool and other spinning machines, or blended with cotton, wool and other fibers.