Injection molding is a process in which molten plastic is injected into a closed mold cavity at a high speed under high pressure, and plastic products with the same shape as the mold cavity are obtained after cooling and molding

Injection molding must meet two requirements: plastic must be injected into the mold cavity in a molten state; The molten plastic must be injected into the cavity with sufficient pressure and flow rate to completely fill the cavity. Therefore, the plastic injection molding process needs to have the basic functions of plastic melting, melt injection and pressure retaining molding

Plastic melting: During the melting process of plastic injection molding, the solid plastics in the plastic injection molding processing and manufacturing enterprises move forward along the screw groove continuously according to the transportation function of the rotating silk thread. Through heating, tamping, cutting and mixing the silk thread, they are transformed into plastic melts with uniform density, viscosity and composition, and spread smoothly in the whole uniform viscous flow state

Injection process: the melted plastic melt is stored in the storage area of the barrel

Cooling and molding process: the plastic injection molding plant supplies the plastic melt that is injected into the mold cavity to overcome various flow resistances and fill the mold cavity. The plastic melt that fills the mold cavity is subjected to huge pressure from the mold cavity, which tends to promote the plastic melt to return to the barrel. Because the cooling effect of the mold cavity causes the plastic melt to cool and contract, at this time, the injection screw continuously provides pressure to keep the plastic melt filling the mold cavity without backflow, And appropriately replenish the plastic melt to the mold cavity. At this time, the injection screw provides pressure to keep the plastic melt filling the cavity without backflow