FDY, Fully Drawn Yarn (called fully drawn yarn in Taiwan), introduces the stretching effect in the spinning process, and can obtain winding yarn with high orientation and medium crystallinity, which is fully drawn yarn. The conventional fully drawn yarn with polyester and nylon belongs to chemical fiber filament. FDY fabrics are smooth and soft to the touch, and are often used to weave artificial silk fabrics. It has a wide range of uses in clothing and home textiles.