Molds & Tooling
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POM Ejector Whitening
Problem Phenomenon
Whitening at ejector pin positions of POM parts
Cause Analysis
Concentrated ejection force exceeds local stress limits; stress whitening is obvious in POM crystalline regions; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Add more and larger ejector pins; ensure sufficient draft angle; raise mold temperature to reduce gripping force; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Ejector whitening is solved by balancing the ejection system; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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