Material Drying
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TPU Dehumidifying Drying Dew Point
Problem Phenomenon
TPU dried in an ordinary oven still has bubbles
Cause Analysis
TPU absorbs moisture extremely fast and requires extremely low moisture content; an ordinary oven cannot achieve the required dehydration depth; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
TPU must use a dehumidifying dryer with dew point below -40°C; drying air volume matched to material quantity; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU drying must use low-dew-point dehumidifying equipment; 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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