Extrusion & Post
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PE Film Wrinkles and Poor Winding
Problem Phenomenon
Oblique or longitudinal wrinkles appear on the film surface, the roll tightness is uneven, the end face is star/chrysanthemum-shaped, and the edge wandering is conical.
Cause Analysis
Wrinkles are mostly caused by poor bubble centering, improper collapsing board angle and uneven nip roller pressure; roll problems mostly originate from thickness deviation accumulation, improper tension taper settings, uneven contact pressure or poor paper core quality.
Solution
①Center the bubble and adjust the collapsing boards and flattening rollers; ②even the nip roller pressure; ③solve the thickness deviation before talking about winding; ④optimize the tension taper curve and contact roller pressure; ⑤check the correction system and paper core quality.
Key Takeaway
Eighty percent of PE film winding problems come from the film's own thickness unevenness: first get the thickness deviation and centering right, then adjust the tension taper; talking about winding on a film with uneven thickness will never wind well.
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