The working principle of the Pet Bottle Preform injection molding machine is similar to that of the injection syringe. It injects a plasticized molten state (i.e., a viscous flow state) into the closed cavity by the thrust of the screw (or plunger). The process of obtaining the product after curing and curing.

Injection molding is a cyclic process, and each cycle mainly includes: quantitative feeding - melt plasticizing - pressure injection - filling mold cooling - mold extraction. After removing the plastic part, close the mold again and perform the next cycle.

Injection Molding Machine Operation Project: The injection molding machine operation project includes three aspects: control keyboard operation, electronic control system operation and hydraulic system operation. The injection process, the feed action, the injection pressure, the injection speed, the selection of the type of injection, the temperature monitoring of each portion of the barrel, the adjustment of the injection pressure and the back pressure are performed.

In general, the screw injection molding machine is formed by first adding a granular or powdered plastic to the barrel, melting the plastic through the rotation of the screw and the outer wall of the barrel, and then moving the mold forward and the injection seat. . The nozzle is placed close to the gate of the mold, and then pressurized oil is introduced into the injection cylinder to advance the screw, thereby injecting the melt into the low temperature closed mold at high pressure and relatively high speed. Maintaining time and pressure (also known as holding pressure), cooling and solidification, the product can be opened by opening the mold (the purpose of maintaining the pressure is to prevent the molten material from flowing back in the cavity, replenish the material into the cavity, and ensure that the product has a certain Density and dimensional tolerance).

The basic requirements for injection molding are plasticization, injection and molding. Plasticization is the premise to achieve and guarantee the quality of molded products. In order to meet the molding requirements, pet preform manufacturers must ensure sufficient pressure and speed during injection. At the same time, due to the high injection pressure, a correspondingly high pressure is generated in the cavity (the average pressure in the cavity is usually between 20 and 45 MPa), so that sufficient clamping force must be obtained. It can be seen that the injection device and the clamping device are key components of the injection molding machine.