Extrusion & Post
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Uneven thickness of BOPP film
Problem Phenomenon
The transverse or longitudinal thickness deviation of BOPP film exceeds the standard; after winding, loose and tight edges appear, and the tension is unstable during printing and laminating.
Cause Analysis
Improper die gap setting makes the cast sheet thickness initially uneven; inconsistent biaxial stretching ratios or cooling temperature differences amplify the thickness deviation during stretching.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Regularly calibrate and optimize the die gap setting; ②keep longitudinal and transverse stretching uniform and consistent; ③stabilize the cast sheet cooling temperature; ④equip online thickness measurement to feedback-adjust the die head.
Key Takeaway
BOPP thickness uniformity is jointly determined by cast sheet quality and stretching consistency; online thickness measurement closed loop is the standard configuration of modern production lines.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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