What is the basic principle of injection molding?

The overall injection molding process is to flow the plastic melt into the closed mold cavity under high pressure, and after heating and condensing, a plastic product with the same shape as the mold cavity is obtained. The following Dongguan injection molding manufacturers will explain the basic principles of large-scale injection molding for you in detail!

Plastic plasticization: During the injection molding process, the solid plastic travels upward through the rotating screw, moves at intervals in the direction of the groove, and is heated through the heating, compaction, stress and mixing of the thread. It is transformed into a palatable fluid plastic melt with symmetrical density, viscosity and composition, and stable origin.

Injection molding process: The plasticized plastic melt is stored in the storage area of ​​the barrel, and the screw rotates during the injection process. Under the action of the screw injection pressure, the plastic melt passes through the barrel at a certain rate. Put the nozzle of the front section into the cavity of the mold using a forming mold casting system, etc.

Cooling and solidification process: The plastic melt flowing into the mold cavity overflows the mold cavity, thereby eliminating various flow resistances. The plastic melt added into the cavity is subjected to extreme pressure from the cavity, which drives the flow of the plastic melt. The tendency to return to the barrel, the plastic melt is heated and expanded due to the cooling effect of the cavity. At this time, the screw is used to obtain pressure again to maintain the plastic melt added into the cavity so that it never migrates, and the mold cavity is properly filled by plastic melting. The body adds shrinkage space within the cavity until the plastic melt gradually heats up and solidifies into a product.