Material Drying
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PPO Rapid Moisture Detection
Problem Phenomenon
【Problem Phenomenon】There is no on-site judgment means for whether PPO drying is qualified, and release is based on experience
Cause Analysis
A moisture content of 0.02% cannot be judged by the naked eye and must be measured with a moisture analyzer; release based on time experience leads to batch errors when equipment drifts; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Equip Karl Fischer or halogen moisture analyzers for regular detection; establish drying release detection procedures; include detection records in batch traceability; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
0.02% cannot be seen or touched; actual moisture meter measurement is the release basis; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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