Extrusion & Post
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PET melt filtration screen change
Problem Phenomenon
During extrusion production, the filtration pressure differential suddenly drops, and gel particles and impurities immediately appear in the sheet
Cause Analysis
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
Solution
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
Key Takeaway
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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