Material Drying
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PPO Ambient Humidity and Storage
Problem Phenomenon
【Problem Phenomenon】PPO pellets are improperly stored after opening, processing moisture exceeds standards and batches fluctuate
Cause Analysis
Although PPO has low water absorption, exposure after bag opening still slowly absorbs moisture; sealed packaging and dry storage are the prerequisites for maintaining 0.02% moisture content; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Store opened material sealed and use within a time limit; equip insulated drying hoppers in humid environments; return remaining material to sealed containers to prevent moisture regain; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Low water absorption does not mean no water absorption; PPO opened-bag management follows the rules; 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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