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Acids: Adjust the PH value; clean the plate layout dirt to prevent dirt from the non-graphic part; dissolve the precipitated material in the fountain solution to reduce the precipitation material in the fountain solution. Commonly used acid components are: phosphoric acid, nitric acid, hydrochloric acid, chromic acid, oxalic acid, acetic acid and citric acid.
Salts: protect the non-graphic part of the printing plate from contact with the ink roller and the water roller, and the blanket roller will not be eroded when it is pressed into contact with it; it will reduce the erosion of the printing plate. For example, the exposed aluminum plate base will react with magnesium nitrate to generate inorganic salts. . Ammonium phosphate, ammonium nitrate, magnesium nitrate, zinc nitrate, and ammonium dichromate.
Alcohols such as isopropanol, ethanol and ethylene glycol: As the printing process, alcohols gradually volatilize, which can reduce the temperature of the printing plate. In addition, due to the lower surface tension of alcohols, alcohols have a better wetting effect, which can reduce the amount of fountain solution, to avoid too much water caused by excessive emulsification of ink, so that the drying speed of the printed materials slow down; to avoid too much water Causes and reduces the swelling of the water absorption of the paper; at the same time prevents the occurrence of paper pulling.
The resin (such as water-soluble gum arabic) has good adsorptivity and hydrophilicity, can improve the overall printing performance of the fountain solution, reduce the amount of fountain solution, stabilize the hydrophilicity of the non-graphic part of the printing plate, and protect the printing plate. Resistance to force.
Wetting agents (such as surfactants): Alcohols can be used as wetting agents, but they are usually added in water fountains in the range of about 2% to about 10%. For surfactants, fountain solutions, including surfactants It is used as a wetting agent. Good wetting can ensure the static to dynamic during printing. When the speed is constantly changing, the fountain solution has a stable wetting effect and can ensure the stability of the printed product.
Preservatives: Recycled water is used to bring in a lot of paper, bacteria and nutrients. In order to prevent the deterioration of water fountain liquid, it is necessary to add preservatives, also known as anti-mold agents and antibacterial agents.
Anti-foaming agent: The foam liquid will produce foam during the dynamic transfer process. In order to prevent the foam from adversely affecting the printing, it is necessary to quickly and promptly defoam.
In addition, some fountain solutions also include stabilizers (evenly stabilize the fountain solution system), anti-hardeners (which have a wider range of applicability), solvents (remove paper and paper powder, and reduce scrubbing media).
Some of the various substances in the fountain solution have multiple functions at the same time, so a reasonable choice helps to save costs and increase product stability.
The basic composition of the fountain solution is: acids, salts, alcohols, resin thickeners, wetting agents, preservatives, defoamers, etc.