The basic process of rotational molding is very simple. It is to put powdered or liquid polymer in a mold, heat it, and the mold rotates and revolves around a vertical axis, and then cools to form. At the beginning of the heating stage, if a powdery material is used, a porous layer is formed on the surface of the mold, and then gradually melts with the cycle process, and then a homogeneous layer of uniform thickness is formed; if a liquid material is used, it flows and flows first. Coated on the surface of the mold, when the gel point is reached, the flow stops completely. The mold is then transferred to the cooling work area, cooled by forced ventilation or water spray, and then placed in the work area, where the mold is opened, the finished part is taken away, and then the next cycle.