Rotational Molding Process: Innovation and Widespread Application of Plastic Molding Technology

Rotational Molding Process: Innovation and Widespread Application of Plastic Molding Technology

Rotational molding, also known as rotomolding or rotational casting, is a method for hollow molding of thermoplastic plastics. It involves heating the mold and rotating it along both longitudinal and transverse axes, allowing powdered or paste-like materials to evenly coat the interior of the mold under the effects of gravity and centrifugal force, and then melt. After cooling, the molded hollow product is removed from the mold. Due to its unique advantages and broad application prospects, this process holds an important position in the plastic processing industry.Basic Principle and Process FlowThe basic principle of the rotational molding process is to add plastic raw material into the mold, which continuously rotates along two perpendicular axes while being heated. Under the influence of gravity and thermal energy, the plastic material inside the mold gradually spreads evenly, melts, and adheres to the entire surface of the mold cavity, forming the desired shape. The product is then cooled and solidified. Rotational molding molds can consist of two or more pieces, and there are no strict limitations on shape and size, making mold design and manufacturing more flexible and convenient.The basic processing procedure of rotational molding involves placing powdered or liquid polymers into the mold, heating them, and simultaneously rotating the mold around two perpendicular axes (self-rotation and revolution). During this process, the material evenly coats the mold cavity and melts under its own gravity and centrifugal force. After cooling, the molded hollow product is removed from the mold.