Injection Molding
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Radial Cracks in the Gate Area of PBT Injection-Molded Parts
Problem Phenomenon
Radial fine cracks appear around the gate of the product.
Cause Analysis
The holding pressure is too high or the holding is excessive, causing internal stress cracks in the gate area; the temperature gradient at the gate is too large, causing thermal stress.
Solution
Reduce the holding pressure; delay gate freezing to facilitate stress relaxation; reduce the mold temperature gradient in this area.
Key Takeaway
PBT gate area cracks are related to excessive holding.
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