The fountain solution has a great influence on the stability of the printing quality of offset products. In order to make the printed graphics and text bright and clear, and the blank layout is not dirty, the concentration of fountain solution must be reasonably adjusted according to the specific printing conditions to ensure that high-quality printed products are printed.
1 Paper performance and fountain solution concentration
When the printing paper is loose in texture or contains dust in the paper, due to the high viscosity of the printing ink, the paper wool and paper powder often accumulate on the blanket during imprinting, which will inevitably increase the friction of the printing plate film and make the printing plate easy Dirty, in this case, the concentration of fountain solution should be appropriately increased; when printing tough and white paper, especially when printing coated paper and glass cardboard, the concentration of fountain solution should be appropriately reduced.
2 Ink performance and fountain solution concentration
Due to the different properties of printing inks, their viscosity, fluidity and acid resistance are also different. The response to the concentration of fountain solution will also be different accordingly, so the concentration of fountain solution should be adjusted as appropriate. Generally speaking, the principle of using the density of fountain solution is as follows: when printing red ink, the concentration is greater than printing black ink; when printing black ink, the concentration is greater than printing cyan ink; while when printing dark ink, the concentration is greater than The density of printing light-colored ink.
3 The amount of desiccant
When printing multi-color plate products, in order to accelerate the drying speed of the ink, dry oil should be added to the ink, which also makes the particles of the ink thicker and the viscosity increases, so that the fat sensitivity of the blank part of the printing plate surface increases, so it is easy to produce paste Edition ills. Based on this situation, the amount of stock solution should be increased appropriately.
4 Concentration of printing plate and fountain solution
The layout structure of printed products is diverse, ranging from solid layouts to lines and textured layouts. If the layout is mainly composed of lines and solid negative characters, the fountain solution concentration should be adjusted appropriately because of its small ink area, so that the blank layout is not easy to get dirty; if the entire printing plate is all dot structure, it should be Use a low-concentration fountain solution; for printing plates that coexist on the ground and dots, the principle of multi-faceted consideration should be adopted to ensure the stability of the printing quality.
5 Workshop temperature and fountain solution concentration
When the temperature of the printing environment rises, the molecular movement of the substance will inevitably accelerate, the ink fluidity will increase, and at the same time, more free fatty acids can be decomposed, making the printing plate surface prone to dirty phenomenon, so when the temperature is high, the fountain solution should be increased concentration.
6 Printing speed and fountain solution concentration
Due to the thixotropic characteristics of the ink, when the printing speed is high, the friction coefficient of the ink roller of the printing machine is large, it is easy to heat and make the ink thin, the coloring power is reduced, and the color of the ink is pale. Printing ink color, so that the printing plate is prone to appear dirty. Therefore, when the printing speed is high, the concentration of fountain solution should be appropriately increased.
In addition to the above, if the printing pressure is high and the texture of the blanket and pad is hard, you should also consider increasing the concentration of the fountain solution appropriately to achieve a better anti-smudge effect. The above shows that the concentration of fountain solution should be comprehensively considered according to various specific situations.
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