Molds & Tooling
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POM ejection scratches and ejector whitening
Problem Phenomenon
Ejector whitening and scratches appear at ejector pin positions, the surface gloss is damaged, and thin walls are even punctured.
Cause Analysis
Uneven ejector pin arrangement or insufficient ejection area causes excessive local ejection force; insufficient draft and low mold temperature cause large gripping force, producing stress whitening during ejection.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Optimize ejector pin position and quantity for balanced force; ②increase the ejection area; ③increase mold temperature to reduce gripping force; ④ensure sufficient draft.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Ejection defects are a manifestation of imbalance between the demolding system and gripping force; balanced ejection combined with reduced gripping protects product surface quality.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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