Injection Molding
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Ejector whitening of PVA injection molded products
Problem Phenomenon
PVA injection molded product shows white marks at ejector pin positions, ejector whitening affecting appearance
Cause Analysis
Excessive ejector pin force causes local compression deformation and whitening; insufficient cooling time, product ejected before fully solidified; ejector pin area too small causing stress concentration
Solution
1) Extend cooling time so the product is fully solidified before ejection; 2) Increase ejector pin area, use 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 the key
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