Textile is a traditional Chinese industry with a long history. As early as the Tang Dynasty, Chinese textiles have already crossed the vast ocean and benefited the world. Today, the textile industry is still a strong industry in China. The lanyard is also one of the textile industry in China. Nowadays, the lanyard products that people can use have many lanyards of different materials. Polyester lanyard is one of them. Its main material is made. It is polyester. Polyester It is an important variety in synthetic fiber and is the trade name of polyester fiber in China. It is a fiber-forming high polymer-polyethylene terephthalate prepared by esterification or transesterification and polycondensation of terephthalic acid or dimethyl terephthalate and ethylene glycol. The ester, the fiber made by spinning and post-treatment, is excellent because of its material and processing, so its use advantage is also very good, which is why it is widely used nowadays.