Extrusion & Post
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TPU Extrusion Shear
Fenómeno del problema
The mechanical performance of TPU extruded products is lower than expected
Análisis de la causa
Excessive extrusion shear breaks TPU molecular chains and reduces performance; 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
Low-shear design of the extrusion screw; speed control; actual melt temperature measurement; 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
TPU extrusion should follow a low-shear route; 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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