The choice of plastic parts is mainly determined by the type of plastic (thermoplastic or thermosetting), the initial form, and the shape and size of the product. The injection molding is generally made by injection molding, transfer molding, and injection molding. Laminating, molding, and thermoforming are molding plastics on a flat surface. The above methods can be used for rubber processing. In addition, there are castings using liquid monomers or polymers as raw materials. Among these methods, extrusion and injection molding are the most used and are the most basic molding methods.