Molds & Tooling
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PPO Ejector Whitening and Cracking
Problem Phenomenon
[Problem Phenomenon] Whitening or puncture at the ejector pins of PPO products, demolding damage
Cause Analysis
Insufficient product strength at ejection or concentrated ejection force: short cooling time, few and small ejector pins, and insufficient draft angle can all cause ejector whitening and cracking; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Extend cooling to increase demolding strength; increase the number of ejector pins for balanced ejection; optimize ejector pin positions to avoid weak areas; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For PPO ejector whitening and cracking check cooling and ejection balance; do not forcibly eject soft parts; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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