Bai Tao explains the basic principles of plastic injection mold processing

Plastic injection mold processing refers to injecting plastic melt into a closed mold cavity at high speed under high pressure, and then cooling and shaping it to obtain a plastic product with the same shape as the model. The following Baitao editor will explain the basic principles of plastic injection mold processing.

Injection molding must meet two necessary molding conditions: the plastic must be injected into the injection mold cavity in a molten state, and the injected plastic melt must have sufficient pressure and flow rate to completely fill the mold cavity. Therefore, injection molding must have basic functions such as plasticizing plastics, melt injection and pressure holding molding.

Plastic plasticization: During the plasticization process of injection molding, solid plastic is continuously moved forward along the screw groove through the conveying action of the rotating screw. After heating, compaction, shearing and mixing of the screw threads, the temperature is increased and converted into a viscous plastic melt with uniform density, viscosity and composition and stable and uniform distribution.

Injection molding process: The plasticized plastic melt is stored in the storage area of the barrel. During injection molding, the screw moves axially. Under the action of the screw injection pressure, the plastic melt flows through the nozzle installed at the front section of the barrel, the mold pouring system, etc. at a certain rate and is injected into the mold cavity of the mold.

Injection molding cooling and shaping process: the plastic melt injected into the mold cavity overcomes various flow resistances and fills the mold cavity. The plastic melt filling the mold cavity is subjected to huge pressure from the mold cavity. This pressure tends to drive the plastic melt to flow back to the barrel. Due to the cooling effect of the mold cavity, the plastic melt cools and shrinks. At this time, the injection screw continues to provide pressure to keep the plastic melt filling the mold cavity without reflux, and appropriately replenishes the plastic melt into the mold cavity to fill the shrinkage space in the mold cavity until the plastic melt gradually cools and solidifies into a product.

Baitao - an integrated service provider of mold and injection molding, has been focusing on the field of high-precision mold and injection molding for many years, creating a full-scale mold industry chain, excelling in product structure optimization, and significantly reducing mold and injection molding costs. We provide you with one-stop services for molds and injection molding processing. Welcome to call us for consultation.