How to control the injection process parameters of PET injection molding machine?

The control of injection molding process parameters of PET injection molding machine is crucial to the production of high-quality plastic products. Reasonable injection molding process parameter settings can affect the molding quality, production efficiency and energy consumption of the product. The following is a detailed analysis of the injection process parameter control of PET injection molding machines:

1. Temperature control:

Screw temperature: PET materials need to be in a specific temperature range to reach the appropriate melting state. By controlling the heating temperature of the screw, it is possible to ensure that the PET material is fully melted and the injection molding process proceeds smoothly.

Mold temperature: Mold temperature has a direct impact on the cooling speed and shrinkage rate of molded products. By controlling the mold temperature, the dimensional accuracy and surface quality of the product can be adjusted.

2. Pressure control:

Injection pressure: Injection pressure controls the speed and pressure of molten PET material entering the mold cavity, directly affecting the density and structure of the product. Appropriate injection pressure can ensure mold filling integrity and avoid bubbles or defects on the product surface.

Holding pressure: Holding pressure controls the degree of compression of the molten PET material in the mold, affecting the density and dimensional stability of the molded product. Reasonable holding pressure can ensure the uniformity and consistency of the product.

3. Time control:

Injection time: Injection time controls the length of time the molten PET material enters the mold cavity. Too long or too short injection time will affect the molding quality and production efficiency of the product. A reasonable injection time can ensure sufficient mold filling and avoid defects on the product surface.

Holding time: Holding time controls the length of time the molten PET material is held in the mold. Appropriate holding time can ensure that the product is fully cooled and solidified, and improves the density and strength of the molded product.

4. Injection speed control:

Injection speed: Injection speed controls the speed at which molten PET material enters the mold cavity. Too fast or too slow injection speed will affect the molding quality of the product. A reasonable injection speed can ensure a smooth surface and stable dimensions of the product.

5. Control other parameters:

Backflow ratio: The backflow ratio refers to the ratio between the screw retraction distance and the feed amount. A reasonable reflow ratio can prevent plastic from reflowing and causing defects.

Hopper temperature: Hopper temperature affects the preheating and delivery of raw materials. Proper hopper temperature can ensure the uniformity and fluidity of raw materials.

Cooling time: Cooling time controls the residence time of the molded product in the mold. Proper cooling time can ensure the molding integrity and surface quality of the product.

Air flow control: Air flow control has an important impact on cooling molds and molded products. Reasonable air flow control can speed up product cooling and improve production efficiency.