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What are the reasons for crack defects in injection molded parts processing
Time:
2024-04-10
When we process injection molded parts, we often encounter unnecessary
When we process injection molded parts, we often encounter unnecessary defects due to minor reasons, which can cause some trouble in our injection molding process. The most common of these defects is crack defects. So, what are the reasons for crack defects in injection molded parts processing?
1. Adding a large proportion of recycled materials to raw materials can cause directional shrinkage or uneven distribution of fillers;
2. Raw material plastics are contaminated, volatile, or poorly dried;
3. Improper demolding design, small demolding slope, thin product walls with sharp corners and gaps, resulting in stress concentration;
4. The holding and injection time is short, and the cooling time is too long or too short;
5. Low or uneven mold temperature, slow injection speed, and low pressure;
6. Improper molding conditions, high stress, and poor ejection;
7. Improper use of release agent, uneven cooling of products after demolding, etc.
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