Injection Molding
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Radial Cracks in the Gate Area of PBT Injection-Molded Parts
Fenómeno del problema
Radial fine cracks appear around the gate of the product.
Análisis de la causa
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.
Solución
Reduce the holding pressure; delay gate freezing to facilitate stress relaxation; reduce the mold temperature gradient in this area.
Conclusión clave
PBT gate area cracks are related to excessive holding.
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