Molds & Tooling
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POM Demolding Sticking
Problem Phenomenon
Parts stick to the mold and get scratched, with surface scratches after ejection; polishing the mold instead worsens sticking
Cause Analysis
POM is hard and slippery, so highly polished mold surfaces instead cause adsorption sticking; insufficient draft angle and unbalanced ejection aggravate scratching; excessive holding pressure also increases the mold grip force; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Draft angle above 0.5-1°; ②use vapor blasting or light bead peening on the cavity surface to improve demolding; ③optimize ejector pin layout and holding pressure parameters; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The counterintuitive point of POM demolding is that too shiny means sticking; moderate surface texture plus sufficient draft is more reliable than mirror polishing; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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