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GPX solved case

Color misregistration and line distortion in offset printing: causes and verification

This problem appeared today. A colleague thinks it may be related to the machine, but we're not sure. Can you help us understand what to check?

By Cristiano Zappacosta — Senior Graphic Production Consultant

The problem

This problem appeared today. A colleague thinks it may be related to the machine, but we're not sure. Can you help us understand what to check?

Cause and analysis

Misalignment between colors and generalized line irregularities suggest a register (color centering) problem or a variation in paper tension during printing, which are common in offset

Wear or misalignment of the pressure cylinders, or an incorrect adjustment of the paper thickness setting, could cause this type of global mechanical distortion

Solution proposed by GPX

A possible cause is a variation in color registration (register drift) due to mechanical play in the cylinders or suboptimal adjustment of the paper positioning devices

Limitations of this analysis

This analysis is generated with the support of Artificial Intelligence: always verify its accuracy and applicability before using it. The reliability level of this analysis is "Medium", not the highest possible.

Checks before proceeding

  • Manually check the color register on the Heidelberg by running a test print with the same paper and same settings: observe whether the misalignment repeats in exactly the same way or varies. Meanwhile, visually inspect the condition of the pressure cylinders and guide rollers (look for scratches, stickiness or accumulated dirt) — a few minutes of maintenance could quickly rule out simple causes

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