Polyester is so-called national flag cloth or polyester fabrics, which is mainly used to print national flags, factory flags, colored flags, knife flags, hanging curtains and hanging flags, as well as beach flags and water injection flags. The warp and weft of polyester are interwoven with Dacron DTY75D/72F. The fabric is woven with flat texture with dense and smooth surface, and small characters can be printed on it. The surface of the material is smooth (without luster) where small text can be printed. The double penetration of the material is favorable, so the colors of the two faces are basically the same.