Material Drying
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TPU Workshop Humidity
Problem Phenomenon
During the plum-rain season, the bubble and silver streak rate of TPU products rises significantly, with different results under the same parameters
Cause Analysis
Rising ambient humidity accelerates moisture absorption of TPU after opening the package; the drying load increases; the original drying time is no longer sufficient to press the moisture content below the red line in the high-humidity season; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Extend drying time in the rainy season and increase the frequency of moisture-content sampling; ②Connect drying air to the hopper; ③Dehumidify the workshop to reduce ambient humidity; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The seasonal quality fluctuation of TPU originates from ambient humidity; compensate drying in the rainy season plus workshop dehumidification to keep the weather outside; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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