Powder spraying: Powder spraying is a relatively common method in printing. It is a more effective method for backside smearing caused by the slow drying of the ink film. When the ink layer is thick, the amount of powder spraying can be appropriately increased, especially the substrate When there is a small area of ​​dark tone net or solid ink stick on the surface, more attention should be paid to appropriately increase the amount of powder sprayed. In general, the amount of powder sprayed should be as small as possible in the effective range, otherwise it will affect the ink color of the printed matter, especially in the products required by bronzing and laminating, the amount of powder sprayed should be controlled.
Drying rack: adopt the method of layered paper collection in the paper collection part of the printing machine, that is, every 5? ~ 20? (The thickness of the separated paper layer can be adjusted according to the density of the substrate and the thickness of the surface ink layer, the density of the substrate is large When the thickness of the ink layer is large, the height of the separated layer should be appropriately reduced) layered paper collection to prevent the destruction of the ink film that has not been dried under the weight of the paper, or the back felt is dirty.
Shaking and drying: Prints with poor surface absorption and thick ink film generally dry slowly. Due to the stack of paper and the low oxygen contact in the air hinders the process of oxidative drying, the paper is gently shaken at intervals to make it breathable. Increasing the contact between ink and air can effectively accelerate the drying of ink.
Finally, let ’s review the key mentioned in this article to control the slow drying of the ink film on the surface of the printed matter, as well as some process methods for the slow drying of the printed matter:
1. Choose the appropriate ink; 2. Use additives and auxiliary agents as little as possible during the printing process; 3. Use dry oil in an appropriate amount; 4. Control the amount of plate surface water and the pH value of the fountain solution in printing; 5. Ensure the environment Constant temperature and humidity are very important; 6. Control the thickness of the ink film of the graphic; 7. Spray powder, drying rack, shaking and drying.
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