Nowadays, more and more cigarette-pack printing companies are paying attention to water-based inks. The application of water-based inks in China's cigarette packs has also improved. However, current water-based inks are mainly used in low-end applications where printing quality is not high. On the cigarette pack, the application on the high-grade cigarette pack is not optimistic, and there are still many cigarette pack printing companies who dare not get involved in the water-based ink field. So, what is the problem that limits the application of the water-based ink for the cigarette pack?
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.
After the ink is stored for a period of time, the upper part of the container is thin, the viscosity is small, and the color and concentration are relatively poor; the lower part is thick, the viscosity is large, and the color and concentration are relatively good. The gravure printing ink is a fluid which is thin and has a small viscosity, because the pigment is poorly dispersed in the binder; the density of the pigment or the filler is too large; and the precipitation is prone to precipitation in a long-term storage. All of these problems can affect the performance of the ink. Even after fully shaking, without affecting the conditions of use, this state of the ink can cause a bad impression to the customer and increase the burden on the worker.
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