Multi-color machine and monochrome machine "flowing" printing method

In recent years, with the popularization of four-color machines and multi-color machines, multi-color printing has been completed on a multi-color machine at a time, greatly improving production efficiency and printing quality. However, in production, it is also often encountered that it requires two times or A job that can only be completed by the "flowing job". For example, some five-color prints need to overprint solid ink such as gold or silver on a large area of ​​dark solids. The ink must be thick and bright, and the gold and silver inks should have a strong metallic luster. If such a job is completed with a five-color offset press at one time, it is actually more difficult to achieve a desired effect.

As we all know, multi-color offset printing presses are the “wet-wet press” superimposition form, and dark-colored solids are often overprinted with two or more colors. The ink layer is relatively thick, and printing has a certain degree of difficulty. It is more difficult to overprint gold and silver inks. Because the transferability and adhesion of gold and silver inks are relatively poor, overprinting onto thicker and unbleached ink layers can easily lead to false printing and loss of metallic luster for gold and silver inks. There will also be "reverse printing" phenomenon. In addition, because the chemical properties of the gold and silver inks are unstable and the transferability is poor, the printing speed must be reduced in the “wet and wet” state, which greatly affects the production efficiency of the multi-color machine.

Most low-efficiency and poor-quality printing methods will be avoided by printing companies. Generally, two printing methods are used. The four-color inks to be printed first are dried and then superimposed with gold and silver inks. The quality can be obtained. Very good guarantee. But if you use a four-color machine to print twice, there will be several color groups "empty cars," too much waste, and less efficient. Therefore, a four-color machine and a monochrome machine “flowing job” production method are generally adopted, which not only ensures the printing quality but also improves the production efficiency of the four-color machine.

In terms of combination of printing presses, in order to ensure accurate overprinting, especially for overprinting of difficult-to-print prints, the author still advocates the use of a monochrome machine of the same type and a four-color machine. However, we have also tried different combinations of offset presses. For example: after the Heidelberg four-color machine was printed, printing a gold and silver ink with a “08” machine was also effective. However, the machine adjustment was more troublesome and needed to reasonably control the “blot” changes of the two machines, especially For thicker paper-like prints, the “blot” changes much more, so it is more difficult to control and must be given enough attention.

Although there is a certain degree of difficulty in the “flowing operations” of offset printing presses, it is entirely possible to master the bold exploration and dare to practice.

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