Ink thickness (below)

At present, the most advanced multi-color offset printing presses are already available with pre-settings. It determines the thickness of each color ink layer, either through a plate scanner or through various interfaces to input pre-set data. The thickness of the ink layer will not be darkly adjusted for the hue of different colors.
For packaged prints that consist entirely of spot color patches, the use of thicker ink layers is allowed without having to consider the problem of neutral gray balance. However, the appropriate ink layer thickness can still be determined by the "GATF test pattern" method. However, it is not based on the difference of visual observation and color, but on the basis of physical compatibility with paper.
The coverage of the ink is not shifted by the depth of hue, but by the transparency of the ink's raw materials. The four-color offset inks currently available on the market have sufficient transparency. It must have the ability to both print and print four-color dot overlap products.
Third, the relationship between the quality of paper and the thickness of the ink "ink" text said: "For printing paper rough surface, soft texture, strong ink absorption products, the hue to adjust the ink slightly, the printing ink layer may be appropriate to thicken some. ”
The first thing to emphasize is that as stated earlier in this article, the hue and density of the ink are regulated and should not be arbitrarily adjusted. If the printability of paper is related to the ink-related part, it is the following two aspects:
1. The paper's color reproduction adaptability It is mainly determined by the paper's whiteness and reflectivity, and its data can be measured in the "GATF test chart". In general, the color rendering of paper is directly proportional to the smoothness of the paper surface and inversely proportional to the ink absorption of the paper. Thus, some experts designed the concept of "paper efficiency." It can be calculated using the following formula:
PSE=100-A+PG/2
In the formula: PSE - Paper Efficiency A - Absorption PG - Paper Gloss From the experimental results, it is consistent with the ink tape printed on the paper with the ash rate, color deviation ratio, and the actual efficiency trend.
2. A direct indication of the surface strength of the paper is the phenomenon of de-dusting during the printing process. It is related to the viscosity of the ink and also related to the printing speed. Here, I am still willing to avoid the direct layer of ink. The thickness of the ink layer is still determined by the color reproduction value of the product. What should I do if the powder off occurs? You can use the method of adding No. 6 varnish to properly reduce the viscosity of the ink. In low temperature environments, pre-inked inks can be used. As for the relationship with printing speed, there is a formula that can be calculated:
VP=3600V/2Ï€ 4.7R (sheets/hour)
Where: VP - printing speed V - critical pull speed R - impression cylinder radius under the premise of other conditions remain the same, you can calculate the print speed limit, in order to ensure that no paper off powder .
There is also some expression and quotation of professional vocabulary such as “friction coefficient”, “ink absorption” and “coloring power” in the “ink” text, and it is also not strict enough and accurate. In view of the length of space and the level of my own, I do not have to discuss this one by one.
In general, the number and quality of engineering and technical personnel in the printing industry in China are far from adequate. There is a considerable distance between the existing level of theoretical knowledge and actual needs of technical knowledge. I put forward the above personal opinions on the relevant contents of the “Ink” text and use this to convey some basic theoretical knowledge. In China's printing industry, not only practical experience but also theoretical knowledge is needed. Not only should you know the terminology and vocabulary, but you should also understand its true meaning and laws. In fact, theory can guide practice.