Molds & Tooling
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POM mold sticking and difficult demolding
Problem Phenomenon
Products stick to the core side and are difficult to demold, with surface scratching or ejector whitening after ejection; the problem is especially prominent for deep-cavity parts.
Cause Analysis
Too low mold temperature causes POM to grip the core tightly after solidification and shrinkage; insufficient draft, rough cavity surface, or vacuum adhesion all increase demolding resistance.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Appropriately increase mold temperature; ②check and increase the draft to 1.5~3°; ③polish the cavity surface; ④optimize ejection area and ejector pin arrangement.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM mold sticking is mostly due to cold mold gripping and insufficient draft; mold temperature and demolding structure design are the prevention priorities, and the mold surface needs repair after scratching.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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