Material Drying
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PET dried material anti-re-moistening
Problem Phenomenon
PET chips that passed drying show white haze defects again after being stored in the silo for half a day
Cause Analysis
PET chips absorb moisture quickly, and dried material exposed to a high-humidity environment re-moistens rapidly, with the previous efforts wasted during storage; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Keep the dried material silo under positive pressure of dry air and sealed; storage does not exceed 4 hours; conveying uses a closed-loop dry air system; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PET dried material is kept sealed and dry throughout, and exposure means failure; after confirming effectiveness, solidify 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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