Dampening solution adjustment and other factors
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The fountain solution has a great influence on the stability of the printing quality of offset printing products. In order to make the printed image bright and clear, the blank layout is not dirty, and the concentration of the fountain solution must be properly adjusted according to the specific printing conditions to ensure the printing of high quality printed matter.
Paper properties and fountain solution concentration
When the printed paper is loose or contains dust in the paper, the printing ink often has paper and paper powder deposited on the blanket due to the high viscosity of the printing ink, which will increase the friction of the printing layer and make the printing plate easy. Dirty, in this case, the concentration of dampening solution should be increased appropriately; when printing tough and white paper, especially when printing coated paper and glass paper, the concentration of dampening solution should be appropriately reduced.
Ink: performance and fountain solution concentration
Due to the different properties of printing inks, the properties of viscosity, fluidity and acid resistance are also different, and the response to the concentration of dampening solution will be different. Therefore, the concentration of dampening solution should be adjusted as appropriate. In general, the concentration of the fountain solution is based on the principle that the concentration of the printed red ink is greater than the concentration of the printed black ink; the concentration when printing the black ink is greater than the concentration of the printed cyan ink; and the concentration when printing the dark ink is greater than The density of the printed light ink.
Desiccant dosage
When printing the stacked color plate product, in order to speed up the drying 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 fatiness of the blank portion of the printing plate is increased, so that the paste is easily generated. The version of the ill. Based on this situation, the amount of stock solution should be increased as appropriate.
Plate and fountain solution concentration
Printed products are available in a wide range of layouts, from solid to mesh and to textured and textured. If the layout is mostly based on lines and solid words, because the ink area is small, the concentration of dampening solution should be adjusted appropriately, so that the blank layout is not easy to get dirty: if the whole plate is all dot structure, then Use a low concentration of dampening solution; for printing plates that coexist in the field and the dot, a multi-faceted principle should be adopted to ensure the quality of the printed product.
Workshop temperature and fountain solution concentration
When the temperature of the printing environment rises, the molecular motion of the substance will accelerate, the fluidity of the ink will increase, and at the same time, more free fatty acids will be decomposed, which will make the printing plate easy to produce dirt. Therefore, when the temperature is high, the dampening solution should be appropriately increased. concentration.
Printing speed and fountain solution concentration
Since the ink has thixotropic characteristics, when the printing speed is high, the ink roller of the printing machine has a large friction coefficient, and it is easy to generate heat to make the ink thin, so that the coloring power is lowered, and the ink color is light, and the ink amount needs to be increased accordingly to deepen. Printing ink, so the plate is prone to dirty. Therefore, when the printing speed is high, the concentration of the fountain solution should be appropriately increased.
In addition to the above, if the printing pressure is large, and the texture of the blanket and the liner is hard, the concentration of the fountain solution should be appropriately increased to achieve a better anti-dirty effect. The above indicates that the concentration of dampening solution should be comprehensively considered according to various specific conditions.