Extrusion & Post
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LLDPE film gel particles
Problem Phenomenon
Gel spots and gel particles appear in the film, transparent film appearance fails, printing ink breaks
Cause Analysis
LLDPE gel originates from the resin itself, degraded material and unmelted particles; narrow-MWD resin is more gel-sensitive; insufficient filtration precision lets particles pass through the screen; recycled material brings in crosslinked particles
Solution
①High-efficiency melt filtration at 80-120 mesh; ②clean sorting of recycled material; ③regularly clean barrel and die to prevent degradation; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LLDPE gel management prioritizes filtration; narrow-MWD grades require higher filtration precision; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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