Material Drying
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TPU drying 0.05% and defect rate
Fenómeno del problema
The defect rate of TPU products suddenly rose by 40%, and tracing found that the drying process was compressed
Análisis de la causa
When TPU moisture exceeds 0.05%, the finished product defect rate rises by 40%; 0.05% is the warning line for general processing, '2079851475616104452 grades require stricter 0.02%, and extrusion grades also require 0.02%
Solución
①dry '2079851475616104452 to ≤0.02% and general to ≤0.05%; ②extrusion strictly 0.02%; ③batches with moisture content exceeding the standard are reworked as a whole batch and must not be released; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
The drying red lines of TPU are clearly graded: general 0.05%, '2079851475616104452 0.02%, extrusion 0.02%; compressing drying time is opening the gate to the defect rate
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