Injection Molding
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EVOH injection molded product ejector whitening
Fenómeno del problema
White marks (ejector whitening) appear at ejector pin positions on EVOH injection molded products, affecting appearance
Análisis de la causa
Ejector pin force too large causing local compression deformation whitening; insufficient cooling time with the product ejected before full solidification; ejector pin area too small with stress concentration
Solución
1) Extend cooling time so the product is ejected after full solidification; 2) Increase ejector pin area using ejector plate instead of small ejector pins; 3) Reduce ejection speed to reduce impact; 4) Increase draft angle to reduce ejection force
Conclusión clave
Ejector whitening is caused by excessive ejection force and insufficient cooling; increasing ejector pin area and extending cooling time are key
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