Material Drying
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TPU Closed Conveying
Problem Phenomenon
After conveying, the moisture content of dried TPU rebounds
Cause Analysis
Ordinary air used for conveying carries moisture; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Closed-loop drying-air conveying for dried material; pipeline insulation; small hopper at the machine; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
TPU dried material conveying must be closed-loop; 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 similar problems in the future
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