Injection molding machine principle

- Mar 02, 2021-

The working principle of the injection molding machine: similar to the syringe used for injection , it uses the thrust of the screw (or plunger) to inject the plasticized and molten plastic into the closed cavity, and the product is obtained after solidification and shaping Process. The general molding process of a screw injection molding machine is as follows: First, granular or powdered plastic is added to the barrel, and the plastic is melted by the rotation of the screw and the heating of the outer wall of the barrel, and then the machine closes the mold and moves the injection seat forward. Then pass pressure oil into the injection cylinder to push the screw forward, so that the melt is injected into the closed mold with a lower temperature at a high pressure and a faster speed, and the pressure is maintained after a certain period of time (also called pressure holding) , Cool, make it solidify and shape, then the mold can be opened to take out the product.