The glazing process is an important part of improving the practical value and quality of packaging and decoration products, trademark labels and book cover prints. By glazing to increase the gloss of the printed products, the colors are more vivid and eye-catching, giving people a beautiful visual effect and doubling the value of the product. The good effect of the glazing process is obvious, but if there is a lack of understanding of the factors affecting the glazing quality, it will be difficult to guarantee the glazing quality. Therefore, it is very beneficial to improve the quality of color printing products to correctly understand several situations that affect the quality of glazing, and then take corresponding measures to overcome them. 1. The effect of temperature on the glazing quality of the product Under normal circumstances, the temperature of the glazing of the printed matter can be controlled at about 20 ℃ to obtain a more ideal effect. However, if it is glazed in winter, due to the low temperature, the glazing oil is relatively easy to solidify, which is not conducive to the normal flow of the glazing oil, so that the oil film on the surface of the glazed product is not uniform, so its brightness is necessarily poor. In order to overcome the disadvantages caused by the defects of environmental conditions, varnish should be placed in a relatively warm place. If the temperature of the varnish is lower than 10 ° C, the varnish should be moved to a room with a room temperature of 20 ° C and left for more than one day and night to maintain the fluidity required by the varnish. If necessary, you can add solvents as appropriate to dilute the varnish stock solution to facilitate normal varnishing. Second, the impact of paper characteristics on glazing quality Process practice shows that the quality and characteristics of paper directly affect the quality of glazing products to a large extent. For example, due to the smooth surface of coated paper, the gloss effect is significantly improved after glazing. On the whiteboard or offset paper, the surface is rough, the glazing effect is relatively poor, and the brightness is not significant enough. This is because the varnish is almost completely absorbed by the rough paper fibers. In order to make up for the defect that the paper is easy to absorb oil and the gloss of the printed product is not glossy, the casein primer can be applied on the surface of the printed product first, and then the glazing can be performed. Brightness to ensure glazing quality. 3. The effect of printing ink on the quality of glazing products If the heat resistance and acid resistance of the ink used in the glazing products are poor, the printed graphics will change color or wrinkle skin and other quality failures. Therefore, the printing ink of glazing products should be selected from acid-resistant, ester-based solvents and acid-alkali resistant. In addition, it is also required that the ink can not change color for a long time and has good gloss, and has a strong adhesive printing effect on the paper, so as to prevent the ink color of the printed product from being changed due to glazing and affecting the glazing quality of the product. 4. The influence of crystallization of printed matter on the glazing quality If the plate printing product is left for too long or excessive dry oil is added to the background ink, the ink layer will form a crystallization phenomenon on the surface of the paper. In this way, the varnish does not adhere to the ink layer when varnishing, resulting in blooming and unevenness of the oil layer. In this case, as long as 5% lactic acid is added to the glazing oil, it can be glazed after stirring evenly. Applying this modified glazing oil to the printed matter can damage the vitrified crystal film on the surface of the printed matter, so as to achieve the requirement of evenly absorbing the glazing oil and form a bright film on the ink layer. As long as the above-mentioned factors that affect the glazing quality are correctly recognized, paying attention to each link in the actual production process can not only improve the production efficiency, but also effectively ensure the glazing quality of the printed products. Cosmetic Bag,Makeup Pouch,Travel Makeup Bag,Drawstring Makeup Bag Ningbo Happiness Stationery Industrial & Trading Co Ltd , https://www.nbcnhappiness.com