Extrusion & Post
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PET melt filtration screen change
Fenómeno del problema
During extrusion production, the filtration pressure differential suddenly drops, and gel particles and impurities immediately appear in the sheet
Análisis de la causa
A sudden drop in pressure differential usually means the filter screen is broken, and impurities penetrate directly into the die; without a pressure differential alarm and spare screen, the amount of waste after screen breakage expands rapidly; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
① Set upper and lower limit alarms for filtration pressure differential; ② dual-station standby for the screen changer; ③ switch immediately after screen breakage and trace the waste range; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Pressure differential monitoring is the sentinel of the PET filtration system; dual-station screen change and rapid tracing keep screen breakage losses to a minimum; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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