Pressure Rollers and the Hidden Cause of Print Ghosting > 자유게시판

Printing pressure units play a fundamental role in the printing process by ensuring consistent contact between the printing plate and the printing medium. When these rollers are misaligned, worn, or operating below, they can produce a common print defects. One of the most common issues linked to inadequate roller tension is print ghosting. Ghosting appear as slight shadow repetitions of the original print pattern, usually shifted marginally from the main image. This occurs because the ink is not being transferred cleanly during each pass.

When pressure rollers are insufficiently compressed, the ink remains partially on the surface, غلطک پرس پرینتر hp leaving leftover pigment on the roller surface. This trapped ink can then be picked up again on later passes and injected into non-print areas, creating the secondary imprint. On the other hand, excessive pressure can cause the roller to deform the paper surface or force ink into unintended areas, leading to delayed set and non-uniform coverage that mimics ghosting.

The problem is often intensified on rapid-production lines where timing and pressure must be optimally balanced. Even minor fluctuations in roller pressure or coating quality can lead to uneven ink transfer. Compromised roller shells with uneven surfaces or stiffened elastomers can also cause non-uniform contact force, making ghosting more likely.

Scheduled servicing of pressure rollers is non-negotiable. This includes checking for wear, removing dried ink buildup, and verifying correct registration and pressure parameters according to manufacturer guidelines. Operators should also track material and ink properties, as factors like flow rate and absorbency can exacerbate transfer issues to worsen output inconsistency.

Grasping the link between pressure rollers and print ghosting allows print shops to pinpoint root causes efficiently and lower material loss. Instead of modifying plate settings unnecessarily, a quick visual check of the pressure rollers can often restore print quality and efficiently. Keeping these components in optimal working order not only enhances output clarity but also prolongs machine longevity.