Injection Molding
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CEF injection molded part ejector white marks
Problem Phenomenon
White marks appear at the ejector pin position of the CEF injection molded part, ejector whitening affecting the appearance
Cause Analysis
Excessive ejector pin force causes local compression deformation and whitening; insufficient cooling time, the part is ejected before being fully solidified; the ejector pin area is too small and the stress is concentrated
Solution
1) Extend the cooling time so that the part is ejected after being fully solidified; 2) Increase the ejector pin area and use an ejector plate instead of small ejector pins; 3) Reduce the ejection speed to reduce the impact force; 4) Increase the draft angle to reduce the ejection force
Key Takeaway
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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