First, the relationship between paper quality and the quality of printing products
The process practice shows that the quality of the glazing of the printed product is directly related to the performance of the paper. The paper with good surface smoothness has weak absorption. After the coating of the varnishes (coatings), the oil layer will float on the surface. The formation of a high brightness film. The poor smoothness of the paper, due to its rough surface, after the coating coating on the paper surface, it will be quickly absorbed by the rough fibers, the paper will not form a bright coating, the gloss effect is poor. Therefore, the higher the smoothness of the paper, the better its light effect. In the actual production process, in the case of poor paper smoothness, in order to improve the glazing effect of the printed products, a layer of casein base material may be coated on the surface of the paper prior to coating. The bottoming effect makes the lacquer of the prints float on the paper after the glazing to form a high-brightness film. It can be seen that the absorbency of the paper surface affects the leveling property of the coating material from the beginning of application to the drying time. This is because the paper surface absorbs the solvent in the coating material, and the coating material is applied for a period of time. As the viscosity increases, the internal resistance of the paint layer flowing on the paper surface increases, so the leveling property is poor. That is, when the coating oil is not smooth, a continuous and uniform film layer cannot be formed, resulting in poor paper glossiness. This is the inevitable result of a good paper absorption. Therefore, in the actual production process, the glazing process and the glazing coating should be adjusted accordingly based on the actual production conditions and the absorptivity and smoothness of the paper surface. If the paper absorbs too much on the paper surface, the viscosity of the glazing coating should be appropriately increased, that is, the amount of diluent should be appropriately reduced. Process practice shows that the quality and characteristics of paper and paperboard directly affect the quality of glazing products. For example, due to the smooth surface of the coated paper, the gloss effect will be significantly improved after coating. The surface gloss of white paper or white cardboard is correspondingly poor, and the brightness of gloss after printing is not significant enough. This is because the coating oil is easily absorbed by cardboard fibers and does not float on paper. In order to make up for the lack of brightness of the paper on the paper, it is possible to increase the proportion of the paint and increase the brightness of the print.
Second, the relationship between production temperature and the quality of printing products
The production process shows that the temperature has a certain relationship with the quality of the coating. Because, the temperature will affect the concentration and fluidity of the coating oil. Usually, the temperature of the glazing on the printing is controlled to be about 20°C, which can achieve relatively good results. However, if the temperature is low in the winter, because of the low temperature, the coating oil will be more easily solidified and thicken. The fluidity of the coating oil is poor, and the oil film on the surface of the coating after the coating is likely to be uneven. The quality of the product coating is also poor. In order to overcome the problems caused by environmental change factors, it is best to place the varnish in a room where the temperature is relatively stable. Generally, the varnish should be placed in a room at room temperature of 20-25°C to maintain a relatively stable fluidity of the varnish.
Third, the relationship between printing ink and the quality of printing products
The characteristics of the printing ink is also an important factor affecting the quality of the coating. The affinity of the printing ink layer and the particle size of the ink will directly affect the coating quality and leveling of the coating oil. If the ink layer on the print cannot be affixed to the glazing coating, it will be difficult for the glazing oil to form a smooth, uniform film on the paper surface. If the particles of the printing ink are large and the dispersity of the pigment is small, the leveling property of the coating oil on the paper surface is poor, which makes it difficult to form a high-quality continuous film layer. When the printing ink layer is poorly dried, it is also difficult for the gloss coating to obtain a good gloss effect, and even problems such as trachoma, bubbles, and the like are easily generated. In addition, the printing ink must have solvent resistance and heat resistance, otherwise the printed image will change color or cause wrinkled skin and other undesirable phenomena. Therefore, the coating printing inks of glazing products should use alcohol-resistant, ester-based solvents and acid-alkali-resistant. At the same time, they should have long-lasting non-discoloring and good gloss properties, and have a strong adhesive printing effect on paper. In order to prevent the varnishes of the ink after printing, the quality of the product is affected.
Triple C International (ShenZhen) Co.,Ltd.was established in 2018. It`s a professional foreign trade company engaged in import and export trade, and carries out business operations such as international trade, cooperative production and intermediary trade. The company mainly provides high-quality OEM-product and ODM-product services for customs in Japan, Southeast Asia, Europe and Unite States, and has a professional technical team that provides hundreds of OEM-product services for dozens of customers, and has dozens of excellent suppliers. The company mainly provides Sewing Products, Plastic Products, Paper Products, Wooden Products, Household Products and other OEM services, including handbags, gift boxes, Storage Boxes, stationery boxes, kid toys, Paper Boxes, school supplies, office supplies and other products import and export business.
