Carton workshop solution to "print marks" problem

The structural features of the multi-layer board printing equipment used in the carton workshop are generally two ink rollers (one bite and one thin) to ink the rubber plates one after the other. According to the transmission principle of the ink path, the thicker one contacts with the printing plate first, which provides more ink for the printing plate. The thinner one touches the printing plate, and the ink supply is relatively small. The role of "flat fill".
The cartons produced by the workshop are printed on two cardboard sheets and then stapled. Since the same paperboard is not too long, after the first paper board is printed, before the second paper board is imprinted, there is a period of time for passing the paper. At this time, the surface of the ink roller is sufficiently restored to the surface smooth state. The surface of the ink roller is inked. The amount of reserves is sufficient, and the ink layer is saturated when the following sheets of paper are printed. However, if the cartons are used in large quantities, two cardboards are still used for printing and then combined together, so the time is longer, so instead of printing through the cardboard (the printing plate still uses a piece), that is, once the entire cardboard is printed, reducing The number of staples increased production efficiency.
In this way, although time is saved for production, it also brings about unexpected quality problems. That is, there are traces of printed images on the printed ink layer on the same paperboard, and this problem has been plaguing the workshop for a long time. time. Finding the cause revealed that the device used only a thicker inking roller to supply ink to the printing plate, and the finer inking rollers were not used (the machine itself was designed as two rollers). Due to the elasticity of the surface of the rubber roller, the surface of the roller cannot be quickly restored to the flat surface after the first contact of the roller with the printing plate. Therefore, when the ink is transferred between the ink rollers, the surface of the ink roller, which is not recovered quickly, remains in contact with the ink. When the printing plate touches the mark, the ink on the roller is transferred to the printing plate, and the ink supply is not saturated due to the presence of traces. The first time the cardboard is printed, the first mark left is printed. This is due to the troubles of using the two ink rollers when cleaning the ink roller after the operator finishes working, so the workshop maintenance worker is removed. At that time, because the paperboard was not long, when the second paperboard printing had a certain time for paper transfer, the surface of the ink roller was restored, and the ink supply was fairly saturated. Later, due to printing on the same long paper board, there was not enough time for the middle to recover the surface of the ink roller. At the same time, there was only a problem that the ink supply roller was gradually insufficient, that is, the ink layer of the first half of the paper was saturated. The lack of ink in the second half of the text shows traces of the previous group. If this is found, the equipment administrator should immediately create a new inking roller to allow the two ink rollers to use the ink on the plate at the same time to make up for the use of only one ink roller because of its poor elasticity. And there is a "print mark" phenomenon.