Processing Machinery
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LLDPE residence management
Problem Phenomenon
After a mid-process shutdown, yellow-spot gel appears on the film
Cause Analysis
LLDPE melt retained for over 30 minutes oxidizes and crosslinks to form gel; when troubleshooting on site, verify item by item according to this mechanism to 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
If shutdown exceeds 20 minutes, lower the temperature or purge; when restarting, discharge material 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
Manage LLDPE residence by the 30-minute rule; 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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