We know that for overprinted and overprinted prints, it is very important for the printed ink to be thick and bright, and to obtain satisfactory visual effects. The organic coordination of ink adjustment and printing is very important, but the specific circumstances should be handled separately according to different conditions.
For example, when the surface of the printing paper is smooth and the ink absorption is poor, the background printing ink layer should be thinner to avoid sticking when overprinting. In addition, the background color is printed thinly, and the superimposed printing effect is good, and it is conducive to the drying of the superimposed ink layer.
For the offset paper products with rough surface and large ink absorption, the ink amount of the background color should be thickened properly, so as to lay a good foundation for obtaining the thick gloss of the plain clothes. When printing a multi-color overprinting plate, the ink layer is thinner than the background color. The ink color is slightly lighter than the original color. Because the background color is basically close to the original color, the overprint is not lightened, and the printed product will be deeper than the original.
In order to ensure normal color registration and prevent the bad effect of overprinting due to the difficulty of drying the ink, when printing the background color and the multi-color version, the amount of ink absorption should be based on the size of the plate, and an appropriate amount of dry oil should be added to ensure the printing quality. Generally, the addition amount of white dry oil is: resin ink 2% -5%, oily ink 3% -10%; the addition amount of red dry oil is about 2%. Because dry oil has an effect on the color of ink, light-colored inks mostly use white dry oils, while red dry oils are mostly used in red and dark inks to avoid deviations in ink hue.
If overprinting on the red or yellow background, and printing gold on the background, then a blank version can be made in addition to the blank part, and a transparent yellow or brightening agent can be printed to increase the gloss of the solid version. In order to ensure the quality of overprinting and prevent overprinting, in addition to the overprinting of black characters on the gold version and the background color with white ink diluent, generally black characters can be printed before printing a large area of ​​the background layout, so that the background color on the printed product can be avoided The ink layer rubs and scratches on the machine. In addition, in order to ensure the accuracy of overprinting, after the background color needle position (that is, the rules) is determined, when adjusting the overprinting position of the overprinted version, only the position of the printing plate can be adjusted, not the position of the front and side regulations, so as to avoid paper There are "water wavy lines" that are not visible to the naked eye on the edges, which affects the stability and accuracy of the overprint.
For the yin and yang overprinted patterns, one of the editions can be properly expanded to overcome the inaccurate overprinting caused by the machine's precision defects and changes in environmental temperature and humidity, resulting in whiteout of the layout and affecting product quality.
Mianyang Crossing Cross-Border E-Commerce Co., Ltd. , https://www.wycybag.com