Processing Machinery
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PET die opening buildup
Problem Phenomenon
Buildup at the PET die lip gradually increases, and the sheet carries streaks
Cause Analysis
Low-molecular substances in the melt precipitate and accumulate at the die opening, periodically falling off to form streaks and impurities; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Regularly clean the die opening; lower the melt temperature to reduce precipitation; verify by changing the raw material grade; 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
Die opening buildup is the accumulation of precipitates; cleaning plus temperature management; 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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