The fountain solution is an indispensable chemical additive in the printing of color printing machines. It forms a uniform water film on the blank part of the printing plate to resist the infiltration of the ink on the blank part of the graphic to prevent the dirty version.
The principle of printing is to use the mutual resistance of water and oil for printing. The printed part of the printing plate has the characteristics of being lipophilic and water-repellent. On the contrary, the non-printing part is hydrophilic and oil-repellent. Therefore, after the printing plate is wetted with water, the non-printing part will form a water film When the ink passes through the printing plate, only the printed part will be stained with ink, and the printed pieces will be printed smoothly. However, the water used to wet the printing plate is not ordinary water. It is actually a liquid with chemicals and electrolytes added to the water; the thing added to the water is the fountain solution. Why can fountain solution affect the quality of printing? Here, we first talk about what role fountain solution can play in printing.
1. Form a water film on the blank part of the printing plate
The formation of water film is the primary function of fountain solution. The fountain solution itself has a low surface tension, so add it to the water to spread the water on the non-printed surface; on the other hand, the electrolyte of the fountain solution will affect the metal of the printing plate. The chemical reaction produces inorganic salts, so that the water film adheres tightly to the blank parts of the printing plate, avoiding the ink from stretching to these parts, otherwise we will not be able to print normal graphics.
Second, supplement the hydrophilic layer damaged in the printing process
During printing, the cylinder and the ink roller rotate to produce friction on the printing plate, which causes the hydrophilic layer on the printing plate to be worn away. At the same time, paper powder and paper wool will more or less fall off during the entire printing process. To further deepen wear and tear and destroy the hydrophilic layer. In this way, if there is no electrolyte in the fountain solution, during the printing process, it will continue to play a chemical role with the metal layer of the printing plate to form a new inorganic salt hydrophilic layer.
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