Extrusion & Post
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Uneven End Face Occurring in Winding/Slitting of Biaxially Oriented Polypropylene Film
Problem Phenomenon
Uneven end faces occur during the winding or slitting of the film, affecting product appearance and use performance.
The winding and slitting quality of biaxially oriented polypropylene film directly affects the final product quality.
Cause Analysis
(1) The winding tension is set improperly or is unstable
(2) The slitting knife is in poor condition or is adjusted improperly
(3) The film itself has internal stress or uneven thickness
(4) The winding/slitting speed does not match the production line speed
(5) The operating environment or equipment conditions are not ideal
Solution
(1) Optimize the winding tension and adopt an automatic tension control system
(2) Check and replace the slitting knife, and adjust the knife clearance
(3) Improve the film production process to reduce internal stress and thickness deviation
(4) Match the winding/slitting speed with the production line speed
(5) Improve the operating environment and maintain the equipment regularly
Key Takeaway
The winding and slitting quality of the film is jointly determined by tension control, knife condition, and the quality of the film itself.
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