Material Drying
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TPU Reduced Toughness
Problem Phenomenon
TPU products feel harder and have poor toughness
Cause Analysis
Excessive drying, thermal degradation or shear degradation all cause TPU to lose elasticity; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Dry according to standard without overheating; control temperature and shear; measure actual melt temperature; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
For toughness decline, check excessive drying and degradation; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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