Extrusion & Post
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LLDPE blown film die lip buildup
Fenómeno do problema
Die lip buildup gradually increases, requiring frequent shutdowns for cleaning, and streaks appear on the film surface.
Análise das causas
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.
Solução
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.
Conclusão principal
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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