Injection Molding
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Ejector Whitening of PBT Injection-Molded Products
Fenómeno do problema
White patches or stress cracks appear at the ejector pin positions when PBT products are demolded.
Análise das causas
The ejection force is too large or the ejector pin area is too small, and the local stress exceeds the limit; the draft angle is insufficient, increasing the demolding force; the cooling is insufficient and the strength is not enough.
Solução
Increase the ejector pin area or increase the number; increase the draft angle ≥2°; extend the cooling time.
Conclusão principal
PBT ejector whitening is the result of excessive local stress.
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