Plastic Mold Classification

· Injection mold
Injection mold is also called injection mold. The molding process of this mold is characterized by placing the plastic raw materials in the heating barrel of the injection machine. The plastic is heated and melted, pushed by the screw or plunger of the injection machine, enters the mold cavity through the nozzle and the pouring system of the mold, and the plastic is solidified in the mold cavity through heat preservation, pressure preservation and cooling. Because the heating and pressurization device can play a role in stages, injection molding can not only form plastic parts with complex shapes, but also have high production efficiency and good quality. Therefore, injection molding occupies a large proportion in plastic molding, and injection molds account for more than half of plastic molding molds. The injection machine is mainly used for the molding of thermoplastics, and in recent years, it has also been gradually used for the molding of thermosetting plastics.
· Compression mold
Compression die is also called pressing die or pressing glue die. The molding process of this mold is characterized by adding plastic raw materials directly into the open mold cavity, and then closing the mold, and after the plastic is molten under the action of heat and pressure, the cavity is filled with a certain pressure. At this time, the molecular structure of the plastic produces a chemical cross-linking reaction and gradually hardens. The compression mold is mostly used in thermosetting plastics, and its molded plastic parts are mostly used in the shell of electrical switches and daily necessities.
· Transfer mode
Transfer die is also called pressure injection die or extrusion die. The molding process of this mold is characterized by adding plastic raw materials to the preheated feeding chamber, and then applying pressure to the plastic raw materials in the feeding chamber by the pressure column, the plastic melts under high temperature and high pressure and enters the cavity through the pouring system of the mold, and then the chemical cross-linking reaction gradually solidifies and forms. The transfer molding process is mostly used for thermosetting plastics, which can form plastic parts with more complex shapes.
· Extrusion die
Extrusion die is also called extrusion head. This mold can continuously produce plastics with the same section shape, such as plastic pipes, bars, sheets, etc. The heating and pressurizing device of the extruder is the same as that of the injection machine. The molten plastic will form continuous molded plastic parts through the head, and the production efficiency is particularly high.
· In addition to the above-mentioned types of plastic molds, there are vacuum forming molds, compressed air molds, blow molding molds, low foaming plastic molds, etc.