Fiber length, thickness, whiteness, gloss and other properties can be adjusted during production. And each having a light, wearable, washable and easy to dry, not rotten, not insects, etc. Widely used in the manufacture of clothing fabric, cloth, conveyor belts, hoses, ropes, nets, electrically insulated wires, medical sutures, tire cord and parachute. Generally the polymer compound can be made into a solution or melt, the pressure from the pores of the spinneret, and then solidified fibers. The product may be continuous filament, cut into a length of staple or tow without cutting the like. Chemical fiber trade names, China Provisional Regulations on synthetic staple fibers always name "Lun" (for example, nylon, polyester), all cellulosic staple fiber name "fiber" (for example, viscose rayon, copper ammonia fiber), at the end of the filament plus a "silk" word, or "Wong", "fiber" to "wire."