Material Drying
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TPU secondary moisture absorption after drying
Problem Phenomenon
After pellets that passed drying are produced for a period of time, bubbles and silver streaks recur.
Cause Analysis
After leaving the dryer, TPU re-absorbs moisture in the hopper or open containers; too long exposure time invalidates the drying effect; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①closed conveying and dry air protection; ②control the exposure time of machine-side pellets; ③cover and insulate the hopper; ④dry in batches according to usage; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU moisture management is a whole-process problem; exposure control after drying is as important as drying itself; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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