1. The whiteness of paper is the basis for printing in vivid colors.
Ideal papers reflect nearly all color shades, while papers that contain gray, black, greenish, reddish, or other color casts absorb some of the incident light, causing the hue, lightness, and saturation of the print to be affected, eventually appearing as color. The difference. This corresponds to the addition of some of the other inks in the ink, which represents the impureness of the finest ink, giving the impression of darkness, turbidity, and color cast.
The main components of paper are cellulose, rubber, fillers, and the like. The ink's flowing part is the connecting material. The pigment of the ink is attached to the surface of the paper by drying the binder film on the surface of the paper. The main components of paper and ink are asymmetric molecules, and when they are close to each other, they rely on the secondary binding force to make the molecules adhere to the paper.
Most of our packaging and decorating products now use coated white paper, wood-pulp noodles, general linerboard, wood pulp linerboard, kraft paper and white cardboard. Due to the differences in the production processes of different paper mills, significant differences in the surface whiteness and smoothness of the paper are caused. Therefore, at the instant of imprinting, the low-molecular part with high fluidity in the ink connecting material is pressed into the large pores of the paper, and the connecting material starts to separate from the ink. If the pigment content of the ink is high, a large number of fine capillaries can be formed in the ink film. These large number of fine capillaries retain the ability of the binder to absorb the binder much more than the fiber gap on the surface of the paper. If the content of pigment is low, ink will adhere to the surface of the paper, causing most of the connecting material to enter the gap of the paper, causing the ink film on the substrate to be thin, and the pigment particles will be exposed, resulting in the final color is not bright.
2. The effect of the ink color and the vividness of the printing ink in the process of ink transfer and rolling
If the color ink is not clean at the time of coating, the ink fountain and the ink roller are mixed with other color inks, which will inevitably cause color casts, and also cause the color to be not bright. Therefore, when changing the color, be sure to clean the ink fountain, the ink roller and the water roller, especially when changing the dark color. The usual practice is to clean the dark ink, and then shovel some of the light-colored ink that will be used. After a period of time, clean it.
For two-color machines and multi-color offset printing presses, especially equipment where the upper and lower units share one impression cylinder, it is necessary to pay attention to the occurrence of color mixing. Once color mixing will definitely cause color cast, the color ink will not be bright.
3. Effect of excessive emulsification of ink and additives on the vividness of printed products
The traditional way of offset printing mainly depends on the balance of ink and ink to complete the printing process. According to the analysis of the ink transfer process, the emulsification of the ink is unavoidable. However, the over-emulsified ink will cause the printed product to fade in color, become old, etc., resulting in reduced color brightness.
In offset printing, various additives, such as diluting agents and driers, are added as required. Adding too much of these additives can sometimes affect the color of the prints. Diluents are white ink, white oil and so on. White oil is mainly an emulsion of magnesium carbonate, stearic acid, varnish and water. This emulsion will promote ink emulsification, resulting in dull colors.
Ideal papers reflect nearly all color shades, while papers that contain gray, black, greenish, reddish, or other color casts absorb some of the incident light, causing the hue, lightness, and saturation of the print to be affected, eventually appearing as color. The difference. This corresponds to the addition of some of the other inks in the ink, which represents the impureness of the finest ink, giving the impression of darkness, turbidity, and color cast.
The main components of paper are cellulose, rubber, fillers, and the like. The ink's flowing part is the connecting material. The pigment of the ink is attached to the surface of the paper by drying the binder film on the surface of the paper. The main components of paper and ink are asymmetric molecules, and when they are close to each other, they rely on the secondary binding force to make the molecules adhere to the paper.
Most of our packaging and decorating products now use coated white paper, wood-pulp noodles, general linerboard, wood pulp linerboard, kraft paper and white cardboard. Due to the differences in the production processes of different paper mills, significant differences in the surface whiteness and smoothness of the paper are caused. Therefore, at the instant of imprinting, the low-molecular part with high fluidity in the ink connecting material is pressed into the large pores of the paper, and the connecting material starts to separate from the ink. If the pigment content of the ink is high, a large number of fine capillaries can be formed in the ink film. These large number of fine capillaries retain the ability of the binder to absorb the binder much more than the fiber gap on the surface of the paper. If the content of pigment is low, ink will adhere to the surface of the paper, causing most of the connecting material to enter the gap of the paper, causing the ink film on the substrate to be thin, and the pigment particles will be exposed, resulting in the final color is not bright.
2. The effect of the ink color and the vividness of the printing ink in the process of ink transfer and rolling
If the color ink is not clean at the time of coating, the ink fountain and the ink roller are mixed with other color inks, which will inevitably cause color casts, and also cause the color to be not bright. Therefore, when changing the color, be sure to clean the ink fountain, the ink roller and the water roller, especially when changing the dark color. The usual practice is to clean the dark ink, and then shovel some of the light-colored ink that will be used. After a period of time, clean it.
For two-color machines and multi-color offset printing presses, especially equipment where the upper and lower units share one impression cylinder, it is necessary to pay attention to the occurrence of color mixing. Once color mixing will definitely cause color cast, the color ink will not be bright.
3. Effect of excessive emulsification of ink and additives on the vividness of printed products
The traditional way of offset printing mainly depends on the balance of ink and ink to complete the printing process. According to the analysis of the ink transfer process, the emulsification of the ink is unavoidable. However, the over-emulsified ink will cause the printed product to fade in color, become old, etc., resulting in reduced color brightness.
In offset printing, various additives, such as diluting agents and driers, are added as required. Adding too much of these additives can sometimes affect the color of the prints. Diluents are white ink, white oil and so on. White oil is mainly an emulsion of magnesium carbonate, stearic acid, varnish and water. This emulsion will promote ink emulsification, resulting in dull colors.
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