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Today's high-quality inks are chemically synthesized using pigments, with the exception of the well-known carbon blacks and large amounts of dioxide. In fact, the appearance of the pigment and its properties come from the resin that carries it. More than a hundred pigments are formulated into inks that cover the spectrum of all colors, but in normal use, typical ink formulations are limited to about 50.


A pigment with high color strength; the binder is composed of water, a resin, an amine compound and other organic solvents. Resin is the most important component in water-based inks. Water-soluble acrylic resin is generally used. The components of the binder directly affect the adhesion function of the ink, the boring speed, and the anti-stick function.


Together, it also affects the gloss and ink transmission of the ink. The amine compound firstly maintains the alkaline pH of the aqueous ink, so that the acrylic resin can supply a better printing effect. The water or other organic solvent is mainly the solvent, the viscosity and the drying speed of the conditioning ink. The auxiliary agent mainly includes: defoaming agent, retarder, stabilizer, weakening agent and the like.


Because the water-based ink is a soap composition, it is easy to generate bubbles during use, so it is necessary to participate in silicone oil as a defoaming agent to press and eliminate bubbles, and improve the ink transfer function. The retarder is used to reduce the drying speed of the hydrophobic ink on the anilox roller and reduce the paste. The stabilizer can adjust the pH of the ink and can also be used as a diluent to lower the viscosity of the ink. The attenuating agent is used to lighten the color of the aqueous ink, and can also be used as a brightening agent to improve the brightness of the aqueous ink. In addition, some water-based inks also need to participate in some wax to add their wear resistance.


Except for aluminum foil, vacuum aluminized film, and paper, all plastic films require EDM treatment before ink printing to achieve a surface tension of 0.04 N/m or more. In the water produced by water as the main solvent, since the surface tension of water is about 0.072 N/m, it can be seen that the surface tension of the ink is greatly different from the surface tension of the film, which will affect the adhesion of the ink on the substrate and improve the plastic film. The surface tension improves the adhesion of the printed pattern to the film.

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