Injection molding classification

Plastic is first added to the heating cylinder of the injection machine, which is heated and melted. Under the push of the injection machine screw or plunger, it enters the mold cavity through the nozzle and mold pouring system, and hardens and shapes into injection molded products due to physical and chemical effects. Injection molding consists of a cycle consisting of injection, pressure holding (cooling), and plastic demolding processes, thus injection molding has the characteristic of periodicity. Thermoplastic injection molding has a short molding cycle, high production efficiency, and low wear of the mold caused by molten materials. It can form complex shapes, clear surface patterns and markings, and high dimensional accuracy plastic parts in large quantities; However, for plastic parts with significant changes in wall thickness, it is difficult to avoid forming defects. Anisotropy of plastic parts is also one of the quality issues, and all possible measures should be taken to minimize it.

Article source: excerpts from Baidu Baike