TPU (Thermoplastic polyurethanes) is thermoplastic polyurethane elastomer rubber. TPU has excellent properties of high tension, high tensile force, toughness and aging resistance, and is a mature environmental protection material. At present, TPU has been widely used in medical and health, electronic appliances, industry and sports, etc. It has the characteristics of high strength, good toughness, wear resistance, cold resistance, oil resistance, water resistance, aging resistance and weather resistance than other plastic materials cannot match.