How Pressure Rollers Cause Ghosting in Printing > 자유게시판

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Printing pressure units play a vital role in the printing process by ensuring consistent contact between the imaging cylinder and the printing medium. When these rollers are out of sync, degraded, or failing to maintain calibrated tension, they can trigger a multiple print defects. One of the most common issues linked to non-optimal roller force 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 unevenly deposited during each pass.

When pressure rollers are under-tensioned, the ink remains partially on the surface, leaving leftover pigment on the roller surface. This residual pigment can then be re-deposited on later passes and deposited in unintended zones, creating the ghosted effect. On the other hand, over-compression can cause the roller to deform the paper surface or spread ink beyond the design, خرابی غلطک پرس پرینتر leading to patchy curing and uneven ink distribution that mimics ghosting.

The problem is often exacerbated on fast-running machines where timing and pressure must be perfectly synchronized. Even tiny inconsistencies in surface friction or rubber integrity can lead to irregular ink release. Worn rollers with uneven surfaces or oxidized surfaces can also contribute to uneven pressure application, making print defects more pronounced.

Preventive upkeep of pressure rollers is essential. This includes checking for wear, cleaning accumulated ink residue, and ensuring proper alignment and roller deflection values according to technical manuals. Operators should also monitor the condition of the ink and the substrate, as factors like viscosity and absorbency can compound roller effects to increase defect visibility.

Understanding the connection between pressure rollers and print ghosting allows print shops to pinpoint root causes efficiently and lower material loss. Instead of adjusting ink or plates unnecessarily, a quick visual check of the pressure rollers can often resolve the problem quickly and effectively. Keeping these components in optimal working order not only enhances output clarity but also extends the lifespan of the entire printing system.