Molding Process
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EVA internal crystallization is coarse
Fenómeno del problema
EVA product internal spherulites >50μm are coarse, causing decreased transparency and low impact
Análisis de la causa
Cooling rate too slow <5°C/min allows spherulites to fully grow; no nucleating agent used to control crystallization
Solución
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
Conclusión clave
Coarse crystallization is caused by slow cooling; fast cooling and nucleating agent are key
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