Injection Molding
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Ejector whitening on EAA injection molded products
Fenómeno do problema
White marks appear at the ejector pin positions of EAA injection molded products, ejector whitening affects appearance
Análise das causas
Excessive ejector pin force causes local compression deformation and whitening; insufficient cooling time, the product is ejected before being fully solidified; ejector pin area too small, stress concentration
Solução
1) Extend the cooling time so that the product is fully solidified before ejection; 2) Increase the ejector pin area, use an ejector plate instead of small ejector pins; 3) Reduce the ejection speed to reduce the impact force; 4) Increase the demolding draft to reduce the ejection force
Conclusão principal
Ejector whitening is caused by excessive ejection force and insufficient cooling; increasing the ejector pin area and extending the cooling time are the key
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