In fact, in modern multi-color offset printing, even if good printing conditions and reasonable processes are used, it is difficult to achieve that the ink can be dried in time during the printing process or before the printing is completed, so we are producing The following three methods are often used in order to accelerate the drying of the ink film or prevent the back of the printed matter from getting dirty.
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? When the layer thickness is large, the separated layer height 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.
So far we have analyzed some of the reasons why the ink film on the printed matter dries slowly and some solutions when the ink dries slowly, hoping to help everyone.
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? When the layer thickness is large, the separated layer height 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.
So far we have analyzed some of the reasons why the ink film on the printed matter dries slowly and some solutions when the ink dries slowly, hoping to help everyone.
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