Printing House Experience with Imposition and Ink Dispensing

For two or more products, the printing factory generally uses two methods in the imposition. If the pattern between the two spells can be seamlessly connected, a one-off post-printing method should be used as far as possible, and no gaps should be left in the middle, because a one-knife approach can save paper and can also save the application of making die patterns. It is beneficial to die-cutting after die-cutting. But if the pattern between the two spells cannot be seamlessly connected. Or by the limitations of the two product shapes, can not be achieved across the board, then between the two products generally have to leave at least 4mm wide row knife position, and each product should have at least 2mm pattern bleeding.

To sum up, the printing house can flexibly and intelligently make impositions, which can not only save costs, but also avoid the bad influence brought by die-cutting to die-cutting processing.

The deployment of ink is one of the important links in the printing process. The quality of ink preparation directly affects the quality of printed products. The following is a little experience of the printing factory on ink distribution, and we hope to discuss it with you.

First, when adjusting ink, you must pay attention to: hue, lightness, and color.

First of all, we must carefully analyze the original color draft, analyze the original color draft according to the principles of the three primary color inks, and determine the color of the main ink of the color draft and the color of the auxiliary ink. In theory, according to the principle of three primary colors, any complex color can be deployed. However, in actual work, it is not enough to use only the three primary colors of ink to match the colors requested by customers. Therefore, more than ten kinds of inks, such as deep yellow, medium yellow, light yellow, dark blue, medium blue, light blue, blue light, dark red, red, orange, light red, and green ink, must be used to meet the practical requirements.

Secondly, after adjusting the hue, when performing lightness deployment, we usually encounter two situations: lightness and lack of lightness. Brightness is too strong, you can add a strong hue with proper hue or simply add black or white to reduce lightness. The lack of lightness can be enhanced by adding some white ink or a light color ink of a suitable hue. For example, we feel that the yellow color drawn out is too strong. To reduce the brightness, we can add a little purple. Finally, adjust the chroma of the oil paint. When the color is too strong or too pure, you can add gray or black ink, or add complementary color ink. If the color is too gray, you should add pure strong color ink.

Second, when dispensing ink should also consider what type of printing press used in the printing process.

The performance of each press is different, so the problems to be noticed when dispensing ink are different. For example, when ink is used in an offset printing machine, it should be noted that the color of the ink during the deposition is deeper than the original color. Because there is no printing pressure during the topography, its ink layer is always floating. In the printing, the pressure of the rubber on the paper is very large, the ink layer is even and solid, and the actual amount of ink is less than that of the topography. Thin ink, poor coloring power.

Third, we must understand the type of paper when we ink.

The use of texture loose, rough surface paper, capillary adsorption force, can increase the ability to absorb ink, in the ink should pay attention to increase the amount of ink. Use smooth, solid paper like coated paper, with less ink. Should pay attention to reduce the amount of ink, so as to avoid waste.

Fourth, we must also take into account the pressure of the printing press.

Large pressure printing press is flat, can make the imprinted ink layer flat and solid, even printing plate phenomenon. Small machine pressure, lack of layout force, so that the imprint ink layer is not strong and floating, resulting in the occurrence of printing plates, can only be used to increase the amount of ink to change the state of the bottom of the printing plate. This means that the same printing plate and paper will print more on a less stressed machine than on a more stressed machine. Therefore, printing plates with a large plateau pressure are generally printed on a round flattening machine, which not only improves the quality of the product, but also saves ink.

To sum up, it is the experience of the printing factory when it comes to printing and ink distribution. We hope to discuss it with everyone.

Source: Printing Technology