Molds & Tooling
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PEEK Stress Whitening and Ejection
Problem Phenomenon
【Problem Phenomenon】The ejection area of PEEK products turns white, and areas with excessive holding pressure darken in color
Cause Analysis
Excessive holding pressure or poor ejection design causes local stress concentration; stress whitening is the optical manifestation of molecular chains being oriented under force; when the ejector pins are unevenly arranged, the stress in the ejection area exceeds the limit
Solution
Optimize the holding pressure curve to avoid over-packing; increase the number of ejector pins to balance the ejection force; check the draft angle and ejector pin layout in the whitened area; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Stress whitening points to over-packing and uneven ejection; reduce pressure first, then balance ejection; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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