Injection Molding
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Ejector Pin Whitening on CMC Injection Molded Products
Problem Phenomenon
White marks (ejector whitening) appear at the ejector pin positions on CMC injection molded products, affecting appearance
Cause Analysis
Ejector pin force is too large, causing local compression deformation and whitening; cooling time is insufficient and the product is ejected before full solidification; ejector pin area is too small, causing stress concentration
Solution
1)Extend cooling time so that the product is fully solidified before ejection; 2)Increase ejector pin area and use ejector plate instead of small 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 the key
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