Cylinder maintenance of sheet-fed printing press

As we all know, on each lithographic printing machine, there are 125 variables that need to be controlled, so maintaining consistency in printing has become a difficult goal. A pre-press expert once told me that they can produce digital printing plates with an error within 0.5% under the condition that the environment of the pre-press workshop is constantly changing. Why we ca n’t do this is a very complicated question, but we can better manage the printing press by sticking to best practices and controlling workflow.

Excessive hardness of the cylinder on the printing press may cause you the following problems: large increase of tone value, uneven dot density, increase of mechanical ghosting, failure of color control, unevenness of dot edge, and dot blur , The graining of halftone patterns and the printing effect of solid color patches are not ideal.

In order to avoid these problems, the press operator must ensure the cleanliness, ink absorption and softness of the cylinder. I might read about the hardness requirements put forward by the printing press manufacturer for each cylinder. Some manufacturers may put different hardness requirements on the cylinders according to their functions and their position on the printing press, while some manufacturers may provide users with a hardness value that is suitable for all cylinders. Now, you must choose an appropriate hardness value for your printing cylinder, and try to maintain this value.

When exposed to ultraviolet light or in a high temperature and easily oxidized environment, the roller will become hard. Therefore, it is best to store the rollers in a dark place and keep them away from heat sources and electric motors.

To keep the printing press cylinders soft, it is best to wash them once a week with decalcification solution or hot water containing 15% vinegar. In addition, every weekend, the operator should also thoroughly clean the roller with ink roller cleaning agent, and rinse the roller again on Monday morning. If possible, avoid using chemicals on the rollers, and never use steel pads. Under ideal conditions, it is best to remove all cylinders on the printing press every quarter for manual cleaning. At the same time, the brackets and frames of the printing press must be cleaned. This is a difficult task, but as long as you put in the effort, you will definitely be able to see the disappearance of stains and the improvement of printing quality.

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