Injection Molding
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EEA injection molded product ejector whitening
Fenómeno del problema
White marks appearing at ejector pin positions on EEA injection molded products, ejector whitening affecting appearance
Análisis de la causa
Ejector pin force too large causing local compression deformation and whitening; insufficient cooling time, product not fully solidified before ejection; ejector pin area too small, stress concentration
Solución
1) Extend cooling time so the product is fully solidified before ejection; 2) Increase ejector pin area, use an ejector plate instead of small ejector pins; 3) Reduce ejection speed to reduce impact force; 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 the key
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