The rotational molding die is suitable for molding large and extra large parts. Because the rotary molding process only requires the strength of the frame to be sufficient to support the weight of materials, molds and the frame itself and the mold closing force to prevent material leakage, it is not necessary to use very bulky equipment and molds even for processing large and super large plastic parts.

The basic processing process of rotational molding die is very simple, that is, put the powder or liquid polymer in the die, heat it, rotate around two vertical axes (rotation and revolution) at the same time, and then cool it. At the beginning of the heating stage, if powder material is used, a porous layer is formed on the surface of the die, and then gradually melted with the circulation process, and finally a homogeneous layer with uniform thickness is formed; If the liquid material is used, the surface of the mold is first flowing and coated, and when the gel point is reached, the flow is stopped completely.