Molding Process
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CEF internal coarse crystallization
Problem Phenomenon
The internal spherulites of the CEF product are >50μm and coarse, causing decreased transparency and low impact
Cause Analysis
The cooling rate is too slow <5°C/min, allowing the spherulites to fully grow; no nucleating agent is used to control crystallization
Solution
1) Increase the cooling rate to >20°C/min to refine the spherulites; 2) Add 0.2-0.3wt% nucleating agent to control crystallization; 3) Reduce the mold temperature to accelerate cooling
Key Takeaway
Coarse crystallization is caused by slow cooling; fast cooling and nucleating agent are the key
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