Processing Machinery
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TPU Barrel Residual Pressure
Fenómeno del problema
After TPU shutdown and restart, the first shot has drooled material
Análisis de la causa
Barrel residual pressure makes the melt seep out and oxidize; 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
Screw retraction to release pressure before shutdown; empty shots to purge clean upon restart; 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
Release pressure at shutdown and purge clean at start-up; 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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