Extrusion & Post
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Uneven thickness of BOPP film
Fenómeno del problema
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.
Análisis de la causa
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
Solución
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.
Conclusión clave
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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