Tips for removing dirt from printing plates

Graphic part of the dirty

When extracting the printed sheets during the printing process, it was found that the printed parts of the printed matter were dirty (paste). After stopping, use a damp cloth to dip the cleaning paste, wipe off the dirt on the printing plate, and wipe it again with clean water. , And then start printing. In doing so, not only will the work efficiency be low, but also the restart, it will also make the ink color of the previous dozens of prints darker, and there will be more waste products. The author summarizes a method in daily work, which can remove the scum of the printing plate without stopping the machine to ensure the continuity of printing. Specific method: When the printing machine is printing normally, use a damp cloth to dip a little cleaning paste, and wipe the corresponding water bucket roller according to the dirty position of the printing plate. On the printing plate, the floating dirt on the printing plate immediately disappeared. In doing so, the effect is very good, and saves time and effort, and also improves work efficiency.

Non-graphic part of the dirty

If the ink is dirty on both sides of the printing plate or on the non-graphic part of one end, it should also be removed in time. On the one hand, as the printing progresses, there is a possibility that the ink stain will expand. Once it spreads into the picture and text, it will cause waste products; on the other hand, the ink stain will be transferred to the impression cylinder via the rubber cylinder. Strenuous. The previous method was to "snip off" the ink on the ink fountain roller corresponding to the non-graphic part of the printing plate or to cut off the liner on the non-graphic part of the rubber cylinder. The effect of applying the above method to remove dirt is very good, but the amount of cleaning paste should be increased. When the machine is stopped, it is necessary to check whether the pressure of the inking roller and dampening roller on the printing plate is adjusted correctly.

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