Tires are ring shaped elastic rubber products that are assembled on various vehicles or machinery and roll on the ground. It is usually installed on the metal rim, which can support the body, cushion the external impact, achieve contact with the road and ensure the driving performance of the vehicle. Tires are often used under complex and harsh conditions. They bear various deformations, loads, forces, high and low temperatures when driving. Therefore, they must have high bearing capacity, traction performance and cushioning performance. At the same time, it is also required to have high wear resistance and flexibility, as well as low rolling resistance and heat generation.