Processing Machinery
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PET thickness fluctuation
Fenómeno del problema
PET sheet longitudinal thickness fluctuates periodically
Análisis de la causa
Thermal expansion drift of die bolts or metering pump speed fluctuations cause periodic thickness changes; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Adjust die bolts in hot state; closed loop between metering pump and extrusion speed; online thickness measurement feedback; 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
Longitudinal thickness relies on metering stability and online closed loop; 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 in the future
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