Molds & Tooling
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POM cooling rate
Problem Phenomenon
POM product dimensions are still changing 48 hours after demolding
Cause Analysis
POM has high crystallinity; when cooling is fast, crystallization is insufficient, and subsequent post-crystallization causes dimensional drift; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Mold temperature 80-100°C ensures sufficient primary crystallization; precision parts are aged after demolding before inspection; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Post-shrinkage is prevented by high mold temperature and inspected after aging; after confirming effectiveness, fix 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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