Material Drying
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TPU Reduced Toughness
Fenómeno del problema
TPU products feel harder and have poor toughness
Análisis de la causa
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
Solución
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
Conclusión clave
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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