Extrusion & Post
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LLDPE Film Thickness Deviation (TD)
Problem Phenomenon
Transverse thickness unevenness.
Cause Analysis
Die lip gap unevenness and air ring asymmetry; die lip buildup (uneven PPA coating) also causes local deviation.
Solution
① Adjust the die lip bolts; ② calibrate the air ring; ③ clean the die lip; ④ check PPA dispersion.
Key Takeaway
TD deviation goes back to the die lip and air ring.
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