Material Drying
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POM drying temperature and time
Problem Phenomenon
After POM was dried at 120°C for 4 hours, the pellets turned yellow and molding produced a pungent odor
Cause Analysis
POM has limited thermal stability, and long-time drying at 120°C has already triggered thermo-oxidative degradation, releasing formaldehyde and breaking molecular chains; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Control POM drying at 80-100°C×2-3 hours, not exceeding 110°C; use as soon as possible after drying; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM drying is a gentle process, and over-temperature drying equals pre-degradation; 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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