Material Drying
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TPU Extrusion Degradation
Problem Phenomenon
TPU extruded products discolor and have black specks, and degraded material is released periodically
Cause Analysis
Excessive residence time or excessive temperature during TPU extrusion causes degradation; degraded material accumulates in dead corners of the barrel and die; aromatic TPU degrades faster above 180℃ in the presence of moisture
Solution
①Control extrusion temperature and residence time; ②regularly clean dead corners of the barrel and die; ③strictly dry aromatic TPU; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU extrusion degradation management runs three lines in parallel: temperature, residence, and dead corners; aromatic grades are especially sensitive; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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