How to improve ink coloring accuracy
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The color adjusted by the ink factory is often inconsistent with the standard color when it is used by the printing factory. This is a problem that is difficult to avoid completely. It can only be to minimize the color difference. What is the cause of this problem and how to control it? How to improve the accuracy of ink factory coloring? I have the opportunity to work in the printing plant, ink factory, and analyze the reasons.
1.Printing method: Most of the ink factories use small printing presses imported from the UK. The mesh of this machine is on a flat plate, and the printing is carried out by a circular embossing roller with a printing film. The printing machine is round and round. In this way, the mesh is on the rotating circumferential roller. The number of lines, angles, etc. of these two kinds of meshes are quite different, which makes the same ink, there is no small difference between the two printing modes, and sometimes it is not only the problem of dark color, but It is the effect that the hue and the brightness will bring a big difference. Some small factories use the ink stick to match the sample, which is even worse. Using the proofing machine of the plate making factory to compare the color, the effect will be much better than that of the imported small printing machine, but the price is almost the same. The proofing machine can be made into the same version of the printing factory, and can design different levels and shades of printing according to the needs. The pattern, which makes the printing method basically the same as that of the printing house, and an important factor affecting the hue - the printing plate, is also the same as the printing house.
2.Version depth: Different prints have different depths, and the ink factory's understanding or estimation of the depth of the prints also affects the accuracy of the color correction. Obviously, if the ink factory prints with a 45μm deep plate for color, and the customer's version is much smaller than 45μm, the printed color will become lighter, and vice versa. Some people think that the ink is adjusted according to the standard ink provided by the user. The depth of the plate can be ignored. In fact, this is a theoretical view, but it is not the case in practice. From the theory, the same two inks (such as splitting a cup of ink into two), whether the plate is deep and shallow (other conditions are the same), the hue is consistent. However, in actual color grading, it is impossible to match the same ink, so there is often such a phenomenon; sometimes the printed version is closer to the color (can meet customer requirements), but if the version is printed, the color will be There is a lot of difference, so it is very important to master the depth of the version. If the version of the customer is deep, you must use a deeper version to print the color.
3.Viscosity: The printing viscosity of the ink factory to the color should be as close as possible to the printing viscosity when the printer prints the ink. The farther the difference between the two, the greater the difference in color. The ink factory uses 22s for coloring, while the customer uses 35s. At this time, the color is definitely much deeper, and vice versa. Some ink factories do not pay much attention to this problem. They do not consider the viscosity of the printing plant. They always use the uniform viscosity to compare the customer's standard samples (there are ink samples and printed samples), which causes a large color difference.
4.Printed materials: The difference between the materials used by the ink mill for color and the printing plant (including other processes) can also cause large chromatic aberrations. Some inks will be printed with a layer of white ink that will be closer to the customer's print, and some will be the opposite. Some ink customers do not change much after compounding, and some of them change very much, such as some transparent colors. Therefore, when the ink factory is toning, it is necessary to figure out the customer's process. The most basic ones include: whether to print the white ink base, what kind of material Whether it is glazing oil.
Theoretically, the closer the printing conditions of the ink factory to the printing conditions when printing with the ink, the higher the accuracy of the inks that are recalled. However, due to the limitations of the conditions, there are still many differences between the two. For example, the printing speed, the environment for viewing the color, the pressure of the printing roller, etc. are impossible to be unified. As long as these four parts are controlled, it can definitely be greatly improved. The accuracy of the color correction of the ink factory.