What Is Plastic Injection Molding

The plastic is plasticized in the heating barrel of the injection molding machine, and then injected into the cavity of a closed mold by a plunger or a reciprocating screw to form a plastic processing method. This method can process products with complex shapes, precise dimensions or with inserts, and the production efficiency is high. Most thermoplastics and some thermosetting plastics (such as phenolic plastics) can be processed in this way. The material used for injection molding must have good fluidity in order to fill the mold cavity to obtain the product. Since the 1970s, a kind of injection molding with chemical reactions, called reaction injection molding, has developed rapidly.