Paper performance
The effect of paper on coating quality is mainly reflected in the effect of paper smoothness on coating quality. The paper with high smoothness has remarkable effect after polishing, and the paper or paperboard with low smoothness has poor effect after polishing because the varnish is completely absorbed by the rough paper or cardboard. In order to solve this problem, you can use a casein base or two times before the application of light.
temperature
Glossing temperature between 18-20 °C, can achieve the best results. In winter, the varnish is easily solidified, and the surface film of the varnish product is uneven. In order to solve this problem, the coating oil needs to be stored in a warm place. If the temperature of the coating oil is too low, it must be properly diluted with a solvent.
Printing ink
Printing inks used for printing products after printing must be solvent-resistant and heat-resistant, otherwise the printed matter will be discolored or wrinkled. The solution is to pay attention to the following points when selecting inks for printing: 1 Use alcohol-resistant solvents, ester solvents, and acid-base inks. 2 It is recommended to use inks that are not discolored and have good gloss. 3 To choose an ink that has good adhesion to paper.
Crystallization of printed matter
The phenomenon of crystallization of printed matter is mainly due to the fact that the printed matter is left for too long, the ink area at the bottom of the print is too large, and the dry oil is excessively added. The ink film has a crystallization phenomenon on the surface of the paper, which often causes glazing or printing to fail. "Face", "dot" and other phenomena. In order to solve this problem, 5% lactic acid is generally added to the varnishes, and they can be used after stirring. The modified varnish is applied to the printed matter so that the vitrified film on the surface of the printed matter is damaged, and the varnish can be evenly applied to the surface of the printed matter to form a glossy film.