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How to Avoid Product Warping and Deformation in Injection Molding?

Mold design is the foundation of injection molding processing. To avoid product warping and deformation, it is necessary to ensure that the mold design is reasonable. Firstly, the cooling system of the mold should be uniform, which can ensure that the molten plastic is subjected to uniform stress during the cooling process and reduce the generation of internal stress. Secondly, the wall thickness of the mold should be as consistent as possible to avoid uneven shrinkage and deformation caused by uneven wall thickness.

1.Control injection molding process parameters

The control of process parameters is crucial in the injection molding process. Parameters such as injection speed, pressure, temperature, and cooling time can all affect the final form of the product. To avoid warping and deformation, the following measures can be taken:

-Injection speed: Reduce the injection speed appropriately to avoid excessive flow pressure of molten plastic in the mold.

-Injection pressure: Adjust the injection pressure reasonably to ensure that the molten plastic evenly fills the mold.

-Mold temperature: Maintain uniform and appropriate mold temperature to avoid uneven cooling caused by large temperature differences.

-Cooling time: Extend the cooling time to ensure that the product is completely cooled before demolding, reducing residual internal stress.

2.Choose appropriate materials

The selection of materials has a significant impact on the quality of injection molded products. The different thermal expansion coefficients, shrinkage rates, and other characteristics of different materials can lead to product warping and deformation. Therefore, suitable injection molding materials should be selected according to the specific requirements of the product. Generally, materials with high crystallinity and low shrinkage can effectively reduce product warping and deformation.

3.Improve the processing environment

The temperature, humidity, and other factors in the injection molding environment can also affect the quality of the product. During the processing, it is necessary to maintain stable environmental temperature and humidity to avoid product deformation caused by environmental changes. In addition, regular inspection and maintenance of equipment to ensure the normal operation of injection molding machines and molds is also an important measure to avoid product warping and deformation.

4.Post processing technology

After injection molding is completed, appropriate post-processing techniques can also effectively reduce product warping and deformation. For example, annealing the product can eliminate internal stress and improve dimensional stability. In addition, using appropriate fixtures to fix products can also reduce the occurrence of deformation.