What Are The Methods To Avoid Shrinkage Marks In Injection Molding Processing?

In injection molding processing, due to the influence of factors, the shrinkage marks of injection molded parts will affect part appearance.

First, the cause of shrinkage marks in the injection molding processing:

1. The melting temperature is not high enough or too low.

2. Plastic problem in mold cavity.

3. Cooling stage of the plastic contact surface.

4. The flow channel is unreasonable, and the cross-section is too small.

5. Adaptation of mold temperature and plastic properties.

6. The product structure is unreasonable (too high, too thick, obviously uneven).

7. The cooling effect is not good, and the product continues to shrink after release.

What are the methods to avoid shrinkage marks in injection molding processing?

1. Adjust the temperature of hydraulic cylinder.

2. Adjust the screw speed.

3. Increase the injection volume.

4. Ensure the correct use of the pad; increase the time of the screw; increase the injection pressure; increase the injection speed.

5. Check whether the check valve is installed correctly because the abnormal operation will cause pressure loss.

6. Reduce the mold surface temperature.

7. Correct flow path to avoid excessive pressure loss, and appropriately expand the cross-sectional size according to actual needs.

8. Properly control the mold temperature according to the characteristics of the plastic and the product structure.

Taizhou Toolsong Mold Co., Ltd., as a factory specializing in the production of automotive molds, will continue to provide you with various effective industry knowledge.