Polyester is a man-made, synthetic material. They are lightweight, smooth, and soft to the touch. Polyester is less prone to wrinkling or shrinkage when compared to natural materials, like linen or cotton. The polyester packaging material is excellent in various properties such as odor-keeping properties, ductile properties, heat resistance, impact resistance and heat-sealing properties, so that the polyester packaging material can be used as inner materials of paper containers, inner coating materials of cans, etc.