Extrusion & Post
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Wrinkles in BOPP film
Fenómeno del problema
The film shows wrinkles after stretching or winding, with poor flatness, affecting printing and bag-making appearance.
Análisis de la causa
Uneven tension, misaligned guide rollers, or excessive processing speed unbalance the transverse force on the film; areas with poor film uniformity are more prone to wrinkling.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solución
①Adopt an advanced tension control system to ensure uniform tension across the full width; ②correct guide roller alignment; ③reasonably control the production line speed; ④improve film thickness uniformity.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Conclusión clave
The direct cause of wrinkles is tension imbalance; closed-loop tension control plus thickness uniformity management can significantly reduce the wrinkle occurrence rate.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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