What is the principle of plastic injection molding?
The principle of plastic injection molding is to heat and melt solid plastic raw materials, then inject them into a mold under the pressure of an injection machine, and finally solidify and shape them through mold cooling.
Jan 08,2025
The principle of plastic injection molding is to heat and melt solid plastic raw materials, then inject them into a mold under the pressure of an injection machine, and solidify them by cooling in the mold. The specific process is as follows:
Raw material preparation: Add granular or powdery plastic raw materials to the hopper of the injection machine.
Melting and plasticizing: The raw materials are heated and melted in the high-temperature barrel, and are uniformly plasticized by the stirring action of the screw or plunger, forming a viscous melt.
Injection molding: The melted plastic is pushed by the screw or piston of the injection machine and injected through the nozzle into a closed mold with a lower temperature. The mold usually has cooling channels for rapid cooling and solidification of the plastic.
Cooling and solidification: The molten plastic is pressurized and cooled and solidified in the mold to form the required plastic product.
Demolding: After cooling and setting, open the mold and take out the molded plastic product.
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