Just on the surface has been printed in print finished coated colorless and transparent coating, a film layer bright. Because glazing coating leveling printing surface, enhancing the smoothness of the printing surface, not only improves the printed surface gloss, and improve the surface properties of printed matter, enhance light fastness of the ink, the ink layer against heat and increase moisture resistance, served to protect the printed graphic, landscaping products, has been widely used for surface machining processing and packaging and decorating book covers, catalogs, substantial decorative, posters and other printed materials in.
Regardless of the technical methods and coating materials, they are required to have excellent polishing quality in order to achieve the intended purpose. From the material point of view, factors affecting coating quality are mainly a good fit between the glaze printing paper, printing ink and coating paint.
(1) printing paper. Printing paper glazing coating the greatest impact on the smoothness of the surface of the absorbent paper, and they affect the paint leveling influence of coating the surface of printing high smoothness bright film. High smoothness of the paper, the paper surface in contact with the coating layer is good, easy to paint leveling, thereby forming a film of high surface smoothness. Strong absorbent surface of the paper, paint flow normally, paper fibers absorb the paint too quickly, so that the coating fluidity difficult leveling. Conversely, a weak surface of the absorbent paper, paper fibers absorb the paint too slow, leveling the paint is not easy conjunctival solidification, it is difficult to form a high smoothness bright film. Therefore, different paper should be chosen to match the paint, adjust the glazing coating leveling time, drying temperature and other technology items.
(2) printing inks. Effect of particle size of the ink ink layer thereby affecting wetting and leveling brightness coatings. If the ink particles large printing surface inevitable rough, difficult to wetting, easy leveling. (3) glazing paint. The main factors that also affect the glazing quality glazing paint, the paint coating is not only to have a colorless, odorless, non-toxic, high gloss, chemical resistance, fast drying and other properties, but also good transparency and difficult to change, with more soft good elasticity, heat resistance, leveling, bonding properties. The paint coating on coating quality is the largest of its viscosity, surface tension and followed a volatile solvent. Paint solvent due to evaporation, infiltration, diffusion and so will be less and less, the viscosity increased gradually. Power leveling happens is the surface tension of the coating, the coating surface tension as much as possible to shrink the surface shape of the smallest traces of the process of leveling the surface into a smooth surface. Therefore, the surface tension of the coating convection flat has a greater impact.