0010010 nbsp; 0010010 nbsp; The factors affecting the glossiness of water-based varnishes, such as the ratio of polymer monomers, water-soluble resins and emulsions, and the leveling properties of varnishes We will continue to talk about impactWater-based varnishOther factors of gloss.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 1. The effect of viscosity on the gloss of water-based varnish

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; The viscosity of the water-based varnish has a great influence on the applicability of the coating, such as leveling and wetting of the coating process. This is because the surface of the printed matter has absorbency to the aqueous varnish, and the absorption of the aqueous varnish on the surface of the printed matter is proportional to the viscosity of the aqueous varnish.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; If the viscosity of the water-based varnish is too low, when coating paper with high absorbency, the water-based Varnish viscosity will be too large. In the initial stage, the viscosity can reach the leveling requirements. However, in the middle and late stages, the viscosity of the water-based varnish is increased, and it is difficult to meet the leveling requirements. The result is that the leveling ends prematurely, resulting in uneven coating on the surface of the printed matter, and some of the water-based varnish will affect the film.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 2. The effect of PH value on the gloss of water-based varnish

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; The pH value of the aqueous varnish is mainly adjusted by ammonia, and the pH value of the general aqueous varnish should be controlled at {{3} } ～ 9. If the pH value is too high and the alkalinity is too strong, the viscosity of the varnish will be reduced, affecting the gloss, and at the same time the drying speed will be slower, and the water resistance will be poor; when the pH is too low, the alkalinity will be too weak, the viscosity will increase, and ammonia Too fast to evaporate in the leveling process, so that the leveling ends too soon, affecting the gloss.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 3. The effect of surface tension on water-based varnish

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; The surface tension of the water-based varnish not only affects the gloss, but also is an important factor that affects the overall quality of the water-based varnish. Because water-based varnishes are usually implemented on the ground or on the ink film, and their surface free energy is usually very small, the surface tension of the water-based varnish is different from the wettability of the same printed matter. The shooting is also quite different.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; If the surface tension value of the water-based varnish is small, the water-based varnish is easy to wet the surface of the printed matter, and the effect It is easy to flatten into a smooth and uniform film surface; if the surface tension of the aqueous varnish is large, it is difficult to wet the ink film on the surface of the printed product, and it is not easy to form a uniform coating; when the value is greater than the surface of the printing ink film At the tension value, the applied water-based varnish coating will shrink, and even in some parts, phenomena such as blistering may occur.