At first it was suspected that it was a revision issue, so it was reprinted. Strict operation in the process of printing and revising to ensure that the layout is clean and the dots are uniform, but the phenomenon of dot dropout also appears after the machine is on, but the location of the dropout is different from the previous time. Using a magnifying glass to observe the place where the plate is removed, it is found that the white dots are very neat and there is no transition between the text and the blank part, thus eliminating the situation that the virtual version may be caused by uneven suction during printing. Reprint the plate and observe the layout after wiping the glue. Nothing happens, and then bake the plate. After baking the plate, place the plate under the light and observe it carefully with a magnifying glass. It is found that one of the dots is false. After wiping with a rubber cloth , And as a result, the phenomenon of page-off occurs again.
In view of the above situation, after careful analysis, it is judged that the possibility caused by the developer is greater. The developer we use is prepared by dissolving the purchased developer powder directly in hot water. When the weather becomes cold or the preparation time is too long, it will produce very small particles of sediment. If it is not rinsed thoroughly after development, the particles will remain on the plate surface. In the case of heat or external pressure, the particles will continue to play a role in dissolving the graphic parts, resulting in a plate-off phenomenon. To confirm this judgment, we reprinted the plate again, washed it thoroughly after development, and wiped the plate evenly with a wet towel, and then glued and baked the plate. Then use the magnifying glass to observe the layout carefully. There is no false dots. After printing on the machine, everything is good, which also confirms our judgment.
Analyze the cause of the failure: First, the preparation time of the developer is too long. Although the developer powder has been fully dissolved during the preparation, precipitation will still occur due to the long time; Second, the colder weather will also cause the developer to precipitate; The third is that the operator did not follow the production process completely, washed directly after development, and did not use 2% to 3% phosphoric acid solution for fixing treatment, which left particles on the plate surface after development, resulting in the phenomenon of plate-off. In fact, the method to avoid this kind of trouble is very simple. First, don't use developer with particle sediment; second, fix it after developing and fully wash it with water. After processing in this way, the phenomenon of printing plate falling out rarely occurs.
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