For pigments, binders and auxiliaries, water-based inks work best.

Mixing selected water-soluble resin, pigment, auxiliary agent and solvent (water), etc., stirring and dispersing through a high-speed dispersing machine (commonly used ball mill, sand mill), mixing uniformly, grinding and dispersing, so that it has sufficient fineness and luster And the coloring power, after filtering and packaging, it is made into water-based ink. The water-based gravure ink is different from the solvent-based ink, and the following points are mainly paid attention to during the use.

1, printing effect control

Generally, water-based gravure inks have the disadvantages of no light, ash, and low concentration. It is often used in printing, which can achieve clear text, complete dot, strong color and distinct layers.

2, appropriate shallow version

On the one hand, the water-based system causes the ink to have the rheological characteristics of Newtonian fluid, and the ink transfer amount is more than 15% larger than that of the solvent-based ink; on the other hand, the solid content of the aqueous ink is high, and the thickness of the dried ink film of the same area can be smaller. Therefore, the ink holes of the same surface area can be engraved shallower.

3. Use defoamer

The water-based ink is weakly alkaline, and bubbles are more likely to be generated in the printing process than the solvent-based ink, and white spots, blisters and the like are present on the printed product, so that about 0.1% of the defoaming agent can be added.

4, drying temperature control

The water-based ink is mainly evaporated and dried, and is reacted with a certain reaction to dry. The resolubility of the dried ink film is inferior to that of the solvent-based ink. Therefore, the hot air temperature control is very important, the temperature is too low, the surface of the ink is dry, but the internal drying is not transparent, and the anti-sticking occurs when the color is applied; the temperature is too high, the ink dries too fast, the dry ink can no longer dissolve in water, and the cleaning is difficult.

5, can not be mixed

Water-based inks cannot be mixed with other solvent-based inks, which can cause quality problems.

6, PH value control

Since the alcohol and the amide bean are volatile, the pH of the ink is liable to change, and it is necessary to pay attention to the usual additives during the printing process.

The difference between the water-based ink and the solvent-based ink is that the solvent used in the water-based ink is not an organic solvent but water, and the volatilization loss in the ink fountain is small, and there is no solvent corrosion problem on the printing plate. The biggest feature of this type of ink is that it significantly reduces the emission of organic volatiles, prevents air pollution, improves the printing environment, and is beneficial to the health of employees. It completely eliminates the harm of certain toxic and harmful substances in solvent-based inks to the human body and the pollution of packaged goods. It is especially suitable for packaging products with strict hygienic conditions such as food, beverages and medicines, but the pH value of such inks is stable. Dryness needs to be improved, especially for multicolor printing on non-absorbent substrates.

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