Ink factory color accuracy

Ink factory adjusted color, when used in the printing plant, often with the standard color error, which is a problem that is difficult to completely avoid, can only minimize the color difference, what is the cause of this problem, and how to control , How to improve the accuracy of the ink factory coloring? I have the opportunity to work in the printing plant, ink factory, analyze the reasons for this.

1. Printing methods: most of the ink factory uses the British import small printing machine, this machine's mesh is on the flat version, through a round embossing roller with the printing film to move to complete the printing, the printing plant's machine is round pressure circle In the method, the mesh is on a rotating circumferential roller. The number of lines and angles of these two kinds of meshes are quite different, which makes the same ink, in the two kinds of printing methods, there is not a small difference, and sometimes it is not only the problem of dark color, but also It is the effect that hue, lightness, etc. will bring about greater differences. Some small factories use the ink stick to make it worse. Using the proofing machine of the plate making factory for the color, the effect will be much better than the imported small printing machine, and the price is almost the same. This kind of proofing machine can be made into the same version as the printing factory, and can design different levels and depths of printing according to the needs. Patterns, which make the printing method basically the same as the printing plant, and an important factor that affects the hue - the printing plate, is also the same as the printing plant.

2. Version depth: Different prints have different depths, and the ink factory's knowledge or estimation of the print version used also affects the accuracy of the palette. Obviously, if the ink factory prints with a 45-μm-thick plate, and the customer's version is much smaller than 45 μm, the printed color becomes lighter, and vice versa, it becomes darker. Some people think that according to the standard ink provided by the user to adjust the ink, the version depth can not be considered, in fact, this is a theoretical view, but in practice it is not the case. Theoretically speaking, two identical inks (such as dividing a glass of ink into two parts) are consistent in their darkness and lightness (other conditions are the same). However, in the actual color grading, it is impossible to reconstruct exactly the same ink, so often there is such a phenomenon: sometimes the printed version of the color is closer (according to customer requirements), but if the printed version is deep, the color will be A lot worse, so it is very important to grasp the depth of the edition. If the version of the client is too deep, it is necessary to use a deep version to print the right color.

3. Viscosity: The color printing viscosity of an ink factory is to be as consistent as possible with the printing viscosity at the time the printer prints the ink. The farther the difference between the two, the larger the color difference. The ink factory uses 22s for coloring, and the customer uses 35s. At this time, the color is definitely much darker, but it is much lighter. Some ink factories do not pay much attention to this issue. Regardless of the viscosity of the printing factory, they all compare the customer's standard with the uniform viscosity (ink-like and print-like), which causes a large color difference.

4. Printing materials: Ink factories use different materials (such as other processes) for coloring and printing. Some inks are printed with a layer of white ink that is closer to the customer's print, and some are the opposite. Some ink customers have not changed much after compounding, but some have changed very much, such as some transparent colors. Therefore, when tinting the ink factory, we must be clear about the customer's technological situation. The most basic ones include whether or not the white ink underlay is printed and what material is compounded. Whether it is coated with oil.

Theoretically speaking, the closer the printing conditions during the coloring of the ink factory to the conditions used by the printing house using the ink, the higher the accuracy of the recalled ink. However, due to the limitations of the conditions, there are still many differences between the two. For example, the printing speed, the environment for watching colors, the pressure of the printing roller, etc., cannot be unified. As long as these four parts are well controlled, they can certainly be greatly improved. The color accuracy of the ink factory.

(Text / Dai Chun)

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