Plainprinting and paste-printing cause analysis - improper control of fountain solution

6 Fountain solution adjustment, improper control

1) The pH of the dampening solution is not properly adjusted. If the dampening solution's acidity is too weak, it will not be able to form enough inorganic salts to supplement the hydrophilic base layer on which the plate surface is continuously worn out. As a result, the oil resistance of the blank part of the plate will be gradually weakened and the dots of the graphic part will be outward. Extend and form a paste phenomenon. On the contrary, when the acidity of the fountain solution is too strong, the graphic part of the plate and its plateau are easily eroded, so that the ink absorption of the dot and the graphic text is weakened, the sense fat capacity is reduced, and the lipophilic basis is destroyed, resulting in the generation of Off edition phenomenon.
2) Improper control of the size of the surface moisture. If the layout of water is too large, it will make the layout and ink roller with a thick layer of water film, thereby affecting the normal and uniform transfer of ink and coating, which can easily lead to plate-off phenomenon; and the layout of water is too large will make the printing ink color Too light, if blindly increase the amount of ink to increase the ink concentration, it will cause excessive emulsification due to water and large ink. If the layout of the water is too small, it will not be able to compete with the ink, so that the layout of the ink layer spread, it will also cause paste version.


Source: "Printing World" Author: Kai Kang

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