Extrusion & Post
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PP Film MD Thickness Deviation
Problem Phenomenon
Periodic thickness fluctuation in the MD direction of CPP/IPP film.
Cause Analysis
Extrusion output fluctuation (screw wear, unstable feeding) or haul-off speed fluctuation; thickness feedback lag.
Solution
①Check feeding stability and screw wear; ②stabilize haul-off; ③closed-loop thickness adjustment; ④optimize die bolts.
Key Takeaway
For MD thickness variation, first stabilize extrusion output and haul-off.
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