It includes two types of structural molds: compression molding and injection molding. They are a type of mold mainly used for forming thermosetting plastics, and the corresponding equipment is a pressure molding machine. The compression molding method for mold processing in Dongguan is based on the characteristics of the plastic. The mold is heated to the molding temperature (generally between 103℃ and 180℃), then the measured compression molding powder is placed in the mold cavity and feeding chamber. The mold is closed, and under the action of high heat and high pressure, the plastic becomes softened and viscous. After a certain period of time, it solidifies and takes shape into the required product form. Injection molding differs from compression molding in that it has a separate feeding chamber. Before molding, the mold is closed first, and the plastic is preheated in the feeding chamber and enters a viscous flow state. Under the action of pressure, it is rapidly squeezed into the mold cavity and hardened to form. Compression molds are also used to form certain special thermoplastics, such as thermoplastics that are difficult to melt (like polytetrafluoroethylene) blanks (cold-pressed), resin lenses with high optical performance, and slightly foamed nitrocellulose car steering wheels, etc. The compression molding mold is mainly composed of the cavity, feeding cavity, guiding mechanism, ejection component, heating system, etc. Injection molds are widely used in the packaging of electrical components. The materials used in the manufacturing of plastic molds and compression molds in Dongguan are basically the same as those for injection molds.