Extrusion & Post
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LLDPE blown film high extrusion pressure
Problem Phenomenon
High head pressure and large torque; forced to raise temperature, which in turn triggers degradation risk.
Cause Analysis
LLDPE melt viscosity is large, screw torque and barrel pressure rise; a narrow die exit further raises back pressure.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Add PPA to reduce extrusion pressure; ②appropriately widen the die exit; ③optimize temperature distribution; ④evaluate high-flow grades.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
LLDPE processing pressure management relates to energy consumption and equipment life; PPA can reduce consumption by 30~60% while improving surface quality.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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