Extrusion & Post
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LDPE Film Thickness Deviation (TD)
Problem Phenomenon
The transverse direction is thick on one side and thin on the other; after winding, one side of the film roll is higher.
Cause Analysis
Uneven die lip gap, asymmetric air ring cooling, and off-center film bubble.
Solution
①Adjust die lip bolts; ②calibrate air ring zones; ③center the film bubble; ④regularly clean die lip buildup.
Key Takeaway
For TD deviation, check die lip and air ring symmetry.
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