Processing Machinery
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LDPE Die Cleaning
Problem Phenomenon
LDPE die build-up causes streaks on the film surface.
Cause Analysis
Die lip build-up periodically falls off forming streaks; 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 literature and should be confirmed first during troubleshooting.
Solution
Regular die cleaning; add PPA to reduce build-up; online monitoring; 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 build-up is managed by cleaning and PPA; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; Incorporate this case into the defect archive as a troubleshooting reference for similar future problems.
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