Material Drying
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TPU drying time 3-4 hours
Problem Phenomenon
Drying by experience for 1 hour then putting into production, bubbles and silver streaks appear in batches on products
Cause Analysis
TPU drying requires 3-4 hours to ensure internal moisture fully diffuses and escapes; insufficient time can only remove surface water, and deep moisture is released during processing forming defects
Solution
①ensure drying time of 3-4 hours; ②appropriately extend in high-humidity environments; ③drying time must not be compressed on the grounds of tight production; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The 3-4 hours of TPU drying is the physical lower limit for deep moisture diffusion; compressing time turns drying into surface work; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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