Processing Machinery
2 views
LDPE Residence Management
Problem Phenomenon
After mid-process shutdown, yellow spots appear on the film.
Cause Analysis
LDPE melt residing over 30 minutes oxidatively degrades; 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
For shutdown over 20 minutes, lower temperature or purge; at restart, discharge until normal; 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
LDPE residence is managed by the 30-minute rule; 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.
Was this helpful?
0 people found this helpful
Thank you for your feedback!