Injection Molding
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Uneven crystallization white haze of PET injection products
Problem Phenomenon
White opaque areas appear locally on PET products, in obvious contrast with transparent areas.
Cause Analysis
Improper mold temperature control; local overcooling causes rapid PET crystallization forming spherulites; when mold temperature below 120°C, crystallization incomplete.
Solution
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.
Key Takeaway
PET crystallization behavior is very sensitive to mold temperature; uniform mold temperature is key.
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