Water-based ink printer factory believe that there is mutual attraction between water-based ink and substrates, and the ink film can be firmly adsorbed on the surface of the substrate. For paper substrates, water-based ink can penetrate into their gaps and adhere using the "anchoring effect"; for substrates with smooth and non-absorbent surfaces, the adhesion of water-based ink depends on the affinity between water-based ink and substrate molecules.

Water-based ink printer factory believe that as the drying time increases, the adhesion of water-based ink gradually increases to a larger value, but then the adhesion gradually decreases to zero, at which time the ink film surface is smooth and dry and loses adhesion. Therefore, ideal overlay printing should be carried out when the viscosity is high, that is, when the water-based ink is about to dry. Because water-based ink is water-resistant, it can be mixed with water before drying, and once it dries, it can no longer be dissolved in water. Therefore, do not let the water-based ink dry on the anilox roller to avoid clogging the inking holes of the anilox roller. In addition, during the printing process, the flexographic plate should always be moistened with ink to avoid clogging the graphics and text on the printing plate after the ink dries.

Water-based ink printer factory believe that the printability of water-based ink is very important and has an impact on the printing process and printing quality, mainly including performance indicators such as viscosity, thixotropy, adhesion, and pH value.

Viscosity refers to the ability of ink fluid molecules to attract each other and hinder the movement of molecules. In the printing process, the viscosity of water-based ink is a necessary condition for maintaining the normal transfer and transfer of ink. The factors affecting the viscosity of water-based ink mainly include the following aspects.

(1) The viscosity of the binder. For inks using the same pigment, the viscosity of the binder is large and the viscosity of the ink is also large.

(2) The size, content and dispersibility of the pigment particles. For the same binder, if the amount of pigment is the same, the larger the particles, the greater the viscosity, and vice versa. The better the pigment dispersion, the smaller the viscosity of the ink, and vice versa, the greater the viscosity of the ink.

(3) Temperature change. When the temperature is high, the relative fluidity of the molecules in the ink increases and the viscosity decreases; when the temperature decreases, the cohesion of the ink molecules increases and the viscosity increases.

Ink printing press manufacturers believe that the thixotropy of ink is the property of the ink's fluidity changing under the action of external force. On the printing press, due to the action of the ink roller, the fluidity and ductility of the ink increase during transfer, until the external force disappears after transfer to the printed sheet, and its fluidity and ductility decrease, and the ink changes from thin to thick, thus ensuring the accuracy and clarity of the embossing and dots. When the ink has good thixotropy, it is conducive to the smooth and uniform transfer of the ink and improves the transfer rate of the ink.