Paper whiteness and absorbency
Whether the paper is white or not is the basis for the bright colors of printed and packaged products. Completely white paper can be close to all of the reflective shade, whereas gray, black sheet absorbs light separation unit, blots hue, lightness and purity suffer. According to the analysis of chromaticity, in the paper printed with pictures, in addition to the spatial mixing of the color dots through the additive color method to form visual colors, the color of the surface of the paper without printed dots (or patterns) actually participates in this. Kind of space mixing. The gray paper is like a small amount of black added to each color ink, so the high purity color ink cannot be seen visually, showing a dark color. Practice has proved that if the other conditions are exactly the same, the whiteness is different. The vividness of the printed pictures is completely different.
The preparation of color ink and how to ensure bright colors in rolling and coating
From the purity of the three elements of color, we can know that the saturation of color refers to the purity of the color. To make the color bright, we must pay attention to the selection of color ink. In addition to the standard three primary color ink, the hue is more pure, there are many principles are three primary colors The hue of the color is consistent with the original, which is conducive to increasing the vividness of the imprint. In order to make the adjusted ink bright, it is especially important to avoid complementary colors. For example, when printing at first glance, lush trees can be printed with light yellow. The resulting leaves are tender and green. If dark yellow ink is used, the yellow ink contains red ink, and red is the complementary color of green. The printed leaves are scorched and black, and do not reflect the breath of early spring, so they are not bright.
If you want to print brightly on the packaged products, you must pay attention to the cleaning of the ink tank and ink roller. This means that when you change the ink, you should prevent the ink of the previous color from being stained by the ink tank, ink roller and water. the resulting color cast, especially in dark changing light, black, blue when changing print yellow, if not pay attention to cleaning will cause color cast, it will also affect the extent of colorful packaging and printing products.
Complete review of outlets
When the dots are expanded, the enlarged color has to reduce the thickness of the black layer, which makes the low-tone and solid parts not thick, the color saturation is weakened, and the inherent hue of a color cannot be exerted. The printed clothes are old and printed. The scenery is like a rainy day.
The influence of ink coloring power and emulsification and dilution
Except for the special case where the color needs to be diluted. The coloring power of the color ink, improperly adding auxiliary materials to dilute the color of the ink during the printing process, or adding auxiliary materials that inhibit drying, and the amount of ink emulsification is large. These factors may reduce the saturation of the printing ink. After printing on the packaged product, it dries slowly, has strong permeability and long penetration time, that is, the imprinted ink layer is not thick, resulting in the imprinted color is not very bright.
Blotting ink layer thickness
Whether the thickness of the imprinted ink layer is just full, this is a key factor for whether the color is intact or bright, which is especially important when issuing a printed sample. If the thickness of the ink layer of each color deviates from the original, it will inevitably distort the hue of the picture after superposition. It is very important to control the ink amount of the first color of the basic color. If this foundation is not laid well, it will be difficult to remedy the various colors in the future. In order to make the hue close to the original, the amount of basic color ink is reduced, and the subsequent colors must be reduced accordingly. In this way, the resulting ink layers of the color are too small, and there is no bright color at all.
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