Injection Molding
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Uneven crystallization white haze of PET injection products
Fenómeno do problema
White opaque areas appear locally on PET products, in obvious contrast with transparent areas.
Análise das causas
Improper mold temperature control; local overcooling causes rapid PET crystallization forming spherulites; when mold temperature below 120°C, crystallization incomplete.
Solução
Increase mold temperature to 130-150°C, use a mold temperature controller for precise temperature control, optimize cooling water channels for uniform mold surface temperature.
Conclusão principal
PET crystallization behavior is very sensitive to mold temperature; uniform mold temperature is key.
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