Molding Process
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MP internal coarse crystallization
Problem Phenomenon
MP products have internal spherulites >50μm, coarse, causing reduced transparency and low impact
Cause Analysis
cooling rate too slow <5°C/min, allowing spherulites to fully grow; no nucleating agent used to control crystallization
Solution
1) increase cooling rate to >20°C/min to refine spherulites; 2) add 0.2-0.3wt% nucleating agent to control crystallization; 3) lower mold temperature to accelerate cooling
Key Takeaway
coarse crystallization is caused by slow cooling; fast cooling and nucleating agent are key
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