Solvent is an important component of gravure ink and flexographic ink, and is also used in plastic film lamination An indispensable material in adhesives. It has the ability to dissolve substances and exert itself. Its volatilization speed is an important factor that determines the drying of the ink layer by volatile ink and affects the printing quality. Therefore, the selection and use of printing ink solvents is very important, and you should have a comprehensive understanding of the solvents used.
Function of solvent
Resin dissolving ability , organic solvents dissolve resin or additives, making the ink a uniform liquid, fluid, and dispersing pigments, which helps the ink transfer from the plate to the printed material during printing, and also helps the ink transfer to the printed material. Material adhesion.
Gives the color moisture and dispersion, which is good for The ink has good stability and has no adverse effects on color hue changes, tinting strength, printing, color distribution, precipitation, aggregation, etc.
The ability to adjust viscosity, organic solvents are Low viscosity liquid can reduce its viscosity after being added to the ink. Therefore, the optimal viscosity value can be adjusted according to the printing speed and plate depth in order to achieve the best effect.
Printing ink solvent
The ability to adjust the drying speed, in In gravure printing, the ideal requirements can be achieved by adjusting the drying speed of the ink according to the printing speed, drying capacity, climatic conditions, pattern area, etc. Under normal circumstances, standard solvents can be used to adjust it. However, due to different conditions, sometimes you cannot only use standard solvents, but must use fast-drying solvents or slow-drying solvents to meet the requirements. The main features of the diluent are its ability to adjust the drying speed and its ability to dissolve resin.
Improves the infiltration of ink into the printed material, and the surface of the printed film is also very difficult to be gravure What is soaked by the ink hinders the transfer of the ink, damages the printing effect, and the printing fastness is not good. If an organic solvent whose surface tension is similar to that of the printed material is used, the wetting of the ink on its surface can be improved, helping to overcome the above shortcomings.Solubility or penetration of the printed material Strength, like polyvinyl chloride, is a substance that can be dissolved in organic solvents. Since the solvent in the ink has some dissolution on its surface, it can improve the adhesion and have good printing fastness. Even insoluble films. Such as ethylene, polypropylene, polyester, etc., due to the expansion of the solvent, its affinity with the solvent can increase the bonding force. Therefore, when manufacturing ink, if the designed solvent has no affinity for the film, excellent printing fastness will never be obtained.
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