Injection Molding
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EMA Injection Molded Product Ejector Whitening
Problem Phenomenon
White marks appear at the ejector pin positions of EMA injection molded products, ejector whitening, affecting appearance
Cause Analysis
Ejector pin force too large, causing local compression deformation and whitening; insufficient cooling time, product ejected before fully solidified; ejector pin area too small, stress concentration
Solution
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
Key Takeaway
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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