Material Drying
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TPU rapid moisture regain after drying
Problem Phenomenon
TPU that passed drying re-shows bubbles and silver streaks after being placed in the hopper
Cause Analysis
TPU absorbs moisture extremely fast, and dried material exposed to air rapidly regains moisture; ordinary hoppers have no heat preservation and dehumidification function, and the drying results are wasted in the feeding link; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①use a hopper dryer for continuous heat preservation; ②pellets exposed to air for no more than 30 minutes; ③enclose the feeding system and replenish frequently in small batches; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The moisture regain speed of TPU requires the insulated hopper to become standard; the 30-minute time limit is a discipline the workshop must implement; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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