News & Knowhow

The images to be printed appear washed out at the inlet of the engraved area. This happens across the web running direction. It can occur in solid colour, but is much more visible in halftone. Usually the cell bars are visible in the printout. Soluti...

Relatively short stripes that appear and disappear randomly on the printed web, making them difficult to detect. They are usually small particles that either pass through the contact zone between the doctor blade bevel and the impression cylinder and...

Stripes that appear at right angles to the web run direction. Depending on the press speed, these stripes can change. The reason is a brief loss of contact between the doctor blade bevel and the impression cylinder. A common cause is poorly balanced ...

Missing dots are isolated, unprinted cells in half and full tones, which are not caused by poor drainage from the impression cylinder onto the substrate. This is either due to cells that are already blocked or because the impression cylinder cannot m...

Relatively continuous defects in the printed area, which affect individual rows of cells and always occur in the direction of printing. These streaks do not necessarily have to move with the doctor blade oscillation. Often foreign particles trapped u...

Hazing describes a visible ink mist in non-printing areas and leads to an increased colour density in printing areas. Hazing is one of the most common problems in garvure print and can have various causes. Solutions to hazing: A too high ink viscosit...

The paint collects around the closing doctor blade and its surroundings. Due to its design, the doctor blade is subjected to dynamic pressure because the lamella surface lies within the chamber and bends inwards. If the doctor blade is too stiff, or ...