Material Drying
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TPU Hardness Deviation
Fenómeno del problema
The hardness of TPU products deviates from the design value
Análisis de la causa
Raw material batches, drying state, and process temperature all affect hardness; when troubleshooting on site, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience; this mechanism has been repeatedly verified by industry materials and should be confirmed first during troubleshooting
Solución
Incoming material hardness inspection; process locking; first article hardness testing; 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
Hardness consistency relies on full-chain control; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems later
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