Processing Machinery
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LLDPE film frost line instability
Problem Phenomenon
The frost line fluctuates up and down, and thickness changes accordingly.
Cause Analysis
LLDPE output is sensitive to temperature fluctuations; die head buildup and screen clogging also cause output pulsation.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Stabilize extrusion temperature; ②regularly clean the die head; ③replace screens on schedule; ④monitor melt pressure trends.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Frost line stability is a sign of LLDPE process maturity; stabilizing material and temperature at the source is fundamental.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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