Factors that influence
Missing dots are most common in gravure printing. The causes vary. Some of the causes are related to the paper topography:
- The paper surface may be too coarse.
- There may be inadequate contact between substrate surface and ink cylinder.
- An electrostatic charge may cause cells to not empty properly.
Other examples are uneven fibre and filler distribution in the paper or insufficient ink absorbency. There are also factors not directly related to the paper, such as the use of a printing press or ink that is not optimised for the task at hand.
Evidently, a thorough investigation is necessary to come to terms with the problem of missing dots.
Avoid costly downtime
There are a number of different methods of measuring and managing missing dots. Solving the problem will save you both time and money and reduce the need for print trials.
Some examples of actions to take:
- cleaning of the ink head
- electrostatic printing assistance (ESA)
- reducing the screen width and/or resolution
Whatever is needed for your particular problem, we have the experience, software and tools to help you. This means we can measure and even predict missing dots. Thereby you can avoid costly repairs and downtime. For more information and help in finding efficient solutions to your missing dots problem, please contact Holmen Paper’s technical specialists.