Make corrugated paper more colorful printing (on)

Water-based ink is one of the three pillars of contemporary flexo printing. Due to the absence of volatile organics, inks that are considered to be environmentally friendly, safe and hygienic in all types of inks have been considered. Water-based inks are drying much faster than offset and gravure inks, and have good printability and abrasion resistance. They also have better performance in terms of printing density and dot gain. They have also been proved to be more suitable and Cardboard printing, the following brief description of how to make ink printing more beautiful.
The ink-absorbing property of the ink transfer printing material has a great influence on the quality of the ink transfer. However, if the paper is too rough, ink absorption is better, which will have a negative effect on the color and the amount of ink used.
Ink transfer is the process of ink penetrating the paper surface by capillary action under the effect of printing pressure. The well-mixed resin is fixed to the surface of the paper by capillary action. The acidity of the paper also plays a role in drying the ink. In order to obtain the best printing effect, the amount of ink used should be minimal under the premise of satisfying the color density and the quality of ink transfer, and is usually expressed in terms of ink holding capacity.
The surface of the paper requires less ink, whereas the rougher surface of the paper consumes more ink. When paper with a rough surface is used, even if the ink is finely regulated and the printed sheet is selected, the dot gain is likely to occur. The dot gain value is related to the type of paper, the surface structure, and the size of the micro-width. In addition, the excessive separation of the binder and the pigment in the ink will cause the anti-friction property of the paper after printing to be reduced, and the powder may be easily generated.
An important factor that determines printability is overprinting, which refers to the overlapping of multiple colors in the same pattern. To obtain a good overprinting effect, the first color ink should be sufficiently dried before the second color ink is superimposed on the first color ink, which is particularly important for the coated paper. Due to the fact that the coated paper surface is smoother than the non-material paper, it is more likely to cause failure. In order to reduce such failures, the color sequence is sometimes adjusted to MYC.
The influence of temperature on the fluidity of the ink changes with temperature, and the viscosity of the ink decreases as the viscosity increases. Therefore, the control of the degree of dryness is very important, and it is preferable to maintain the normal temperature. With the ink supply system of the squeegee system, the ink balance can be maintained only when the temperature is controlled.
In North America and Northern Europe, where the temperature has changed greatly, printers have fully realized that with the change of climate and the season, the temperature of the printing shop will also have great changes. Keep the viscosity of the ink stable and control the amount of diluent. The higher the generality, the less the amount of diluent needed, and the dilution of the ink will reduce the density of the print. The ink thinner is water or a lighter medium.
Drying Properties and Viscosity Control Waterborne inks are adsorbed on the surface of the substrate by evaporation, infiltration, precipitation and related chemical reactions. Evaporation is the removal of volatile organics from the printing surface ink by hot air.
The so-called osmotic drying is under the action of the capillary tube, the ink penetrates into the surface of the printing material. Often refers to the separation of liquid ink and solid phase liquid ink, liquid phase platform into the paper fiber, synthetic resin and solid phase remain on the surface of the paper, the corresponding chemical reaction is conducive to print on the ink layer drying. However, the corrugated post-printing process does not use chemical drying, and most of them use ultraviolet rays, infrared rays, electron beams or microwave drying.
In order to reduce the evaporation of the water-based ink in the ink fountain and the doctoring system, modern corrugated paper printing presses are generally equipped with a closed ink inking device. Most printing press ink tanks are located below the printing press unit and use an ink pump to pump the ink into the ink fountain. Ink through the unit during the cycle of continuous contact with the roller and the ink roller and the air convection solvent evaporation, resulting in increased viscosity, printing color density increased. In this case, it is usually necessary to dilute to make the viscosity meet the requirements. Do not add too much water to water-based inks, or it will be too thin. The water-based ink is too thin. Do not adjust the viscosity of the water-based ink by pouring fresh ink into the thin ink. Experience shows that if a new ink is poured in a thinner water-based ink, a lot of new ink is needed, and effective inks should be gradually added to the new ink.
Water-based ink viscosity control is to ensure its performance and print color, water-based ink is only a small amount of solvent volatilization, easier to adjust than solvent-based ink. Due to paper and board printing... The drying speed of water-based inks is closely related to printers, and related to the dispersion of resin and water in aqueous ink formulations. The best balance between drying speed and printability should be found.
Fast-drying inks used in high-speed printing can also quickly dry onto plates or anilox rolls during printing. Therefore, pay special attention to this type of ink.
Additives Additives are added to the ink to improve the performance of the ink. The amount of additives is generally small. To make the additive work, it is first necessary to understand its properties and possible side effects. The ink additives include defoamers, killers, waxes, surface active agents, moisturizers, transfer aids, binders, anti-caking compositions, slip agents, and the like.
Surfactants can reduce the surface tension of water-based inks, contribute to diffusion, increase gloss, and reduce the likelihood of agglomeration of the pigment in the diluted ink. (To be continued)

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