The basic composition of fountain solution is: acids, salts, alcohols, resin thickeners, wetting agents, preservatives, defoamers, etc.
Acids: adjust the PH value; clean the plate surface dirt to prevent the non-graphic parts from getting dirty; partially dissolve the precipitation 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 parts of the printing plate from contact with the ink roller and water roller, and the blanket roller to prevent erosion when in contact with the imprint; reduce the erosion of the printing plate, such as the replacement reaction between the bare aluminum base and magnesium nitrate to generate inorganic salts . Ammonium phosphate, ammonium nitrate, magnesium nitrate, zinc nitrate, ammonium dichromate, etc.
Alcohols such as isopropanol, ethanol and ethylene glycol: as the printing process progresses, alcohols gradually volatilize, which can reduce the temperature of the printing plate. In addition, alcohols have a lower surface tension, so they have a better wetting effect, which can reduce the amount of fountain solution and avoid excessive emulsification of the ink caused by too much water, which slows the drying speed of the printed products; avoid too much water Induces and reduces paper swelling and water absorption; at the same time, prevents paper fluffing.
The resin (such as water-soluble gum arabic) has good adsorption and hydrophilicity, can improve the overall printing performance of the fountain solution, reduce the amount of fountain solution, stabilize the hydrophilic ability of the non-graphic part of the printing plate, and protect the printing plate. Press resistance.
Wetting agent (such as surfactant): Alcohols can be used as wetting agent, but usually add about 2% -10% to the water in the bucket liquid. For surfactant type fountain solution, the surfactant It is used as a wetting agent. Good wetting can ensure that the printing fluid has a stable wetting effect when printing from static to dynamic, and when the speed changes continuously, which can ensure the stability of the printed product.
Preservatives: The circulating water in the water bucket brings a lot of paper wool, bacteria and nutrients. In order to prevent the growth of the water bucket causing deterioration of the water bucket, it is necessary to add a preservative, also called anti-fungal agent and anti-bacterial agent.
Defoaming agent: The water in the water bucket will generate foam during the dynamic transmission process. In order to prevent the adverse effects of foam on printing, timely and rapid defoaming is required.
In addition, some fountain solutions also add some stabilizers (so that the fountain solution system is even and stable), anti-hard water agent (this has a wider applicability), solvents (remove paper powder, reduce scrubbing plate)
The various substances in the fountain solution have multiple functions at the same time, so a reasonable choice helps to save costs and increase the stability of the product.
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