Extrusion & Post
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LLDPE Film Thickness Deviation (MD)
Problem Phenomenon
Longitudinal thickness fluctuation.
Cause Analysis
Extrusion output pulsation and haul-off fluctuation; LLDPE processing pressure is high, and filter screen blockage causes output fluctuation.
Solution
① Stabilize feeding and extrusion; ② monitor filter screen pressure difference; ③ stabilize haul-off; ④ thickness measurement closed loop.
Key Takeaway
For MD fluctuation check extrusion stability and filter screens.
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