Molds & Tooling
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PA66 ejection whitening demolding
Problem Phenomenon
Ejector pin marks whiten after PA66 product ejection, and severe cases are pushed through
Cause Analysis
Demolding force concentrates at ejector pin points, and local stress exceeds the limit and whitens; ejector pin arrangement is unreasonable or clamping force is too large; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Add more and larger ejector pins arranged at rigid positions; draft angle and polishing up to standard; appropriately raise mold temperature to reduce gripping; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Ejection whitening is solved from both ends of the ejection system and demolding resistance; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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