Processing Machinery
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PET screen change fluctuation
Problem Phenomenon
At the moment of screen change, bubbles and sudden thickness changes appear in the PET sheet
Cause Analysis
During screen change, melt pressure changes abruptly and air is entrained, causing instantaneous defects in the product; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Use a continuous screen changer; run at reduced speed during screen change; cut and isolate products at the moment of screen change; 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
Key Takeaway
Screen change fluctuations are controlled with a continuous screen changer plus isolation and cutting; 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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