Polyester yarn is a type of yarn made from polyester, which has many advantages, such as high strength, good elasticity, and durability. The uses of polyester yarn are very wide, covering various fields from clothing to industrial products. Polyester yarn has extensive applications in the field of clothing. Due to its durability, good elasticity, resistance to deformation, and resistance to corrosion, polyester yarn is often used to make clothing fabrics and decorative materials. It is blended or interwoven with various fibers, such as cotton-polyester and wool-polyester, and widely used in various fabrics and decorative materials. In addition, polyester yarn is used to make household textiles such as curtains and bedding, as its good shape retention and wash-wearability enable these textiles to maintain their shape after multiple washes. In the industrial field, polyester yarn also has important applications. It is used to make conveyor belts, tents, canvas, ropes, fishing nets, etc. In particular, polyester cord is almost as good as nylon in performance and has become an important material for tire manufacturing. In addition, polyester yarn is used in electrical insulation materials, acid-resistant filter cloth, and medical industrial fabrics, showing its diverse applications in the industrial field.