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2. Excessive emulsification, cross-coloring, and scumming:
(1) In the non-alcoholic printing system, the ink roller system will accelerate the emulsification and reach ink-water balance, which may result in over-emulsification of the ink, especially in the printing of large field patches and large dot color areas. When this problem occurs, on the one hand, it is necessary to cut off the connection between the ink paths of the waterway in a timely manner, so that the fountain solution can be transferred to the printing plate before being emulsified. It is better to prevent the integrated ink roller from running on the water roller; on the other hand, In the system without alcohol, the ink will not be diluted, and at the same ink setting, the density of the color will be higher than that of the alcohol-containing system; thus reducing the setting of the amount of ink, while reducing the amount of fountain solution, It will be able to return to the minimum normal operating condition of the ink.
(2). Check the hardness of the ink roller. The softer rubber has a more excellent effect in the printing without alcohol. The efficiency of any ink roller system depends on the performance of the ink roller at the maximum tension setting, which requires a certain adjustment when using a new dampening fluid. It is worth noting that the non-alcoholic system is completely different from the alcohol system. To successfully operate the alcohol-free system, new technologies need to be re-learned.
Problems that may occur with alcohol-free printing
1. Weaker water volume is “too highâ€: Due to the higher viscosity of alcohol-containing systems than non-alcoholic systems, the amount of water delivered to the printing plate by the alcohol-containing system is greater than that of non-alcoholic systems at the same time and at the water roller speed. In order to avoid the dirty version, it is necessary to increase the speed of the water roller, giving the impression that the amount of water is increased. If you reduce the pressure of the water roller, so that the water roller speed setting is comparable to when printing with alcohol, the worker will not feel the water is too high.