How to improve the accuracy of ink grading

The colors adjusted by the ink factory often have errors with the standard colors when they are used in the printing factory. This is a problem that is difficult to avoid completely. It can only be to minimize the color difference. What causes this problem and how to control , How to improve the accuracy of ink factory color adjustment? I have the opportunity to work in a printing factory and an ink factory, and analyze the reasons.

1. Printing method: Most of the ink factories use small printing machines imported from the UK. The mesh of this machine is on a flat plate, and the printing is completed by moving the printing film with a round embossing roller. In the rounding method, the mesh is on the rotating circumferential roller. The line numbers and angles of the two meshes are quite different, which makes the same ink have a big difference between the two printing methods, sometimes not just the problem of light and dark colors, but It is the hue, lightness, etc. that will bring about a large difference in effect. Some small factories are even worse with the ink scraper. Use the proofing machine of the plate-making factory to match the color, the effect will be much better than that of the imported small printing machine, but the price is about the same. The pattern, which makes the printing method basically the same as the printing factory, and an important factor that affects the hue-the printing plate, is also the same as the printing factory.

2. Plate depth: Different prints have different plate depths, and the ink factory's understanding or estimation of the plate depth used by the prints also affects the accuracy of color grading. Obviously, if the ink factory uses a 45μm deep plate for color printing, but the client's plate is much smaller than 45μm, the printed color will become lighter, otherwise, it will become darker. Some people think that the ink is adjusted according to the standard ink control provided by the user, and the depth of the plate can be ignored. In fact, this is a theoretical view, but it is not the case in practice. In theory, two identical inks (for example, a cup of ink is divided into two), whether the version is dark or light (other conditions are the same), the hue is the same. However, in actual color matching, it is impossible to formulate the same ink, so there is often such a phenomenon; sometimes the color of the light printed version is closer (can meet the customer's requirements), but if the dark version is printed, the color is There is a lot of difference, so it is very important to master the depth of the plate. The deeper the client ’s version, the darker the version must be used to print the color.

3. Viscosity: The printing viscosity of the ink factory for color matching should be as close as possible to the printing viscosity of the printing factory when printing the ink. The farther the difference between the two, the greater the color difference. It takes 22s for color adjustment in ink factory and 35s for customers. At this time, the color must be much darker and vice versa. Some ink factories do not pay much attention to this problem, regardless of the viscosity of the printing factory, and uniformly compare the customer's standard samples (with ink samples and printed samples) with a uniform viscosity, which causes a large color difference.

4. Printed materials: The difference between the materials used by the ink factory and the printing factory (including other processes) will also cause a large color difference. Some inks printed with a layer of white ink will be closer to the customer's prints, and some will be the opposite. Some ink customers have little change after compounding, while some have very big changes, such as some transparent colors, so when ink factories are toning, they must understand the customer's process conditions. The most basic ones include: whether to print white ink support, what materials are compound , Whether to varnish.

Theoretically, the closer the printing conditions of the ink factory during color adjustment and the conditions when the printing factory uses the ink for printing, the higher the accuracy of the transferred ink. However, due to the limitations of the conditions, there are still many differences between the two, such as: printing speed, color viewing environment, pressure of the printing press roller, etc., cannot be unified, as long as these four parts are controlled, it can be greatly improved Accuracy of color adjustment in ink factory. (Author unit :)

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