The Working Principle of Plastic Injection Mold

Plastic injection mold is an important plastic processing tool. Plastic injection molds transform the plastic raw materials into products of various shapes and sizes. The principle of injection mold can be summarized as the following steps: 1. Plasticizing and injection First of all, plastic raw materials undergo a series of processing treatments, such as drying, screening, mixing, etc., to become plasticized materials suitable for injection molding. In the heating barrel of the injection machine, the plastic begins to melt and plasticize under the action of heat and forms a uniform molten state. Subsequently, the plasticized plastic is pushed into the nozzle of the injection machine through the pushing action of the plunger or screw. When the plastic in the nozzle accumulates to a certain amount, the driving force of the injection machine stops, and the nozzle of the injection machine injects plastic into the pouring system of the mold. At this point, the pouring system introduces the plastic into the mold cavity. 2. Mold filling Under the pressure of the injection machine, the plastic flows in the mold cavity and fills the entire cavity. In this process, the plastic is subjected to pressure and temperature, and continues to plasticize and melt. At the same time, the cooling system of the mold begins to work, and the heat inside the mold is taken away by the cooling channel or the cooling medium, so that the plastic is quickly cooled and shaped in the cavity.
3. Mold opening and stripping When the plastic is cooled and hardened in the mold cavity, the mold is opened and the molded plastic product is pushed out of the mold cavity or removed from the mold. This process is called mold opening and stripping. When the mold is opened, the parting surface of the mold is opened, and the product is pushed out or taken out of the mold. Then, the mold is closed and ready for the next round of injection molding. 4. Other auxiliary actions In the process of injection molding, some other auxiliary actions are also involved, such as the exhaust of the mold, the adjustment of the ejector mechanism, and the control of the mold temperature. These actions are essential to ensure the quality of the product and the stability of the production. In conclusion, the principle of plastic injection mold mainly involves plasticizing and injection, mold filling, mold opening and mold stripping. These steps are coordinated to complete the injection molding process of plastic products. With the continuous progress of science and technology, plastic injection molding technology is also developing, and new injection machines, molds and processes continue to emerge, which provide more choices and possibilities for the production of plastic products.

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