Increasing Doctor Blade pressure is often a "band-aid" fix that addresses the symptom rather than the cause of ink spitting. While more pressure might momentarily stop the leakage by forcing the blade against the roller, it creates excessive friction and heat. This leads to accelerated wear of the anilox ceramic surface, reducing the Cell Depth and permanently altering the Anilox Volume. Over time, this wear causes color fading and necessitates expensive roller reconditioning.
Instead of increasing pressure, specialists should investigate the blade's flexibility and the ink's rheology. A "softer" blade or one with a specialized anti-spitting profile can maintain a seal at lower pressures. Furthermore, checking for vibrations in the press and ensuring the blade chamber is properly aligned can provide a permanent solution. Protecting the longevity of the anilox while maintaining a clean wipe is the hallmark of a professional and cost-effective printing operation.