There are a decisive factor for the inking rules of gravure printing and three related factors. The following is divided into four aspects.
1. The depth and shallowness of the characters and patterns produced by the plate cylinder determine the amount of ink on the printed matter. That is, the characters and patterns of the printing plate cylinder are made deep, and the amount of ink on the printed matter is large. On the contrary, the characters and patterns are made light, and the amount of ink on the printed matter is small.
2. The hardness of the impression cylinder material and the pressure of the impression cylinder affect the amount of ink on the printed matter. The material of the impression cylinder is soft, and the amount of ink on the printed matter is large. On the contrary, the material of the impression cylinder is hard, and the amount of ink on the printed article is small. The pressure of the impression cylinder is large, and the amount of ink applied to the printed product is large. On the contrary, the pressure of the impression cylinder is small, and the amount of ink applied to the printed product is small.
3. The viscosity of the ink affects the amount of ink on the printed matter. The viscosity of the ink is large, and the amount of ink on the printed matter is large. On the contrary, the viscosity is small, and the amount of ink on the printed matter is small.
4. The printing speed is fast and slow, which affects the amount of printing ink. The printing speed is fast, the amount of ink on the printed matter is large, and the printing speed is slow, the amount of ink on the printed matter is relatively small.
Plate cylinder is the decisive factor in determining the amount of ink on the printed matter. The viscosity of the printing ink is the most important factor affecting the amount of ink on the printed matter, and it is also an important factor affecting the printing speed. The viscosity of the ink is measured, and the thinness of the ink is obtained through perception. The two are closely related. Although the viscosity is not equal to the thickness, the viscosity and the thickness results are inseparable when actually measured with the paint cup and the Zahn cup.
In order to facilitate understanding, the following will be discussed in terms of viscosity instead of viscosity, that is, viscosity is called thick, and viscosity is called thin. Then, when the characters and patterns made by the plate cylinder are deep, the ink needs to be thick, otherwise the ink will be ghosted, which is the phenomenon of halo. On the contrary, the characters and patterns made by the printing plate cylinder are shallow, and the ink should be thin, otherwise it will dry the plate, that is, block the plate. The printing speed is fast, the ink needs to be thin, otherwise the phenomenon of unclean scraping will occur. The printing speed is slow, the ink should be thick, otherwise there will be water marks on the printed matter. Phenomenon of running ink, knife line, eating ink, fake drying, etc., have a great relationship with the ink is too thick.
Summarizing the above, four formulas are obtained:
The deep ink of the printing plate pattern should be thick;
The printing pattern light ink needs to be thin;
Fast printing speed, ink needs to be thin;
The printing speed is slow and the ink needs to be thick.
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