Material Drying
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TPU drying 0.02% red line
Problem Phenomenon
TPU products show bubbles and silver streaks, mechanical properties decline significantly, and products become brittle
Cause Analysis
TPU is a strongly hygroscopic material and can absorb up to 3% moisture when exposed to air; residual moisture catalyzes hydrolysis in the 180-220℃ melt, breaking molecular chains and reducing molecular weight, manifesting as performance loss and embrittlement
Solution
①dehumidify and dry to moisture content ≤0.02% ('2079851475616104452); ②hopper dryer continuously keeps warm to prevent moisture regain; ③use moisture content rather than time as the drying qualification standard
Key Takeaway
0.02% is the golden red line for TPU '2079851475616104452; drying to the moisture content specification rather than the time specification is the core proposition of professional manufacturers such as Foster; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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