Extrusion & Post
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LLDPE blown film die lip buildup
Problem Phenomenon
Die lip buildup gradually increases, requiring frequent shutdowns for cleaning, and streaks appear on the film surface.
Cause Analysis
LLDPE high-viscosity melt easily adheres and accumulates at stress concentration points on the die exit wall; antiblock agents and other additives also accelerate precipitation and buildup.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Add 300ppm-level PPA aid to form a die wall lubricating layer; ②regularly clean the die exit; ③optimize die exit temperature; ④evaluate additive precipitation effects.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Die lip buildup is a persistent problem in LLDPE production; PPA lubricating layer technology can significantly extend the die cleaning cycle.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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