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What are the causes of cracks and defects in the processing of injection parts

2023-09-27

When we process injection molding parts, we often have some unnecessary defects due to some small reasons, which will cause certain trouble to our injection molding. Among these defects, the most common is the crack defect, then, what are the reasons for the crack defect in the processing of injection parts?
Plastic Injection parts

1, the proportion of recycled materials added to raw materials is large, so that the shrinkage direction of raw materials is large or the distribution of fillers is uneven;
2, raw material plastic pollution, volatiles or poor drying;
3, the release design is improper, the release inclination is small, the product wall is thin and there are sharp corners and notches, resulting in stress concentration;
4, the pressure holding and shooting time is short, the cooling time is too long or too short;
5, the mold temperature is low or uneven, the injection speed is slow, the pressure is low;
6, improper forming conditions, large stress and poor ejection;

7. Improper use of release agent, uneven cooling of products after release, etc.

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