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The law of gravure printing on ink has a decisive factor, three influencing factors. The following is a description of the four aspects.
1. The depth and lightness 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 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 shallow, 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 print is large. On the contrary, the material of the impression cylinder is hard, and the amount of ink on the print is small. The pressure of the impression cylinder is large, and the amount of ink on the printed matter is large. On the contrary, the pressure of the impression cylinder is small, and the amount of ink on the printed matter is small.
3. The viscosity of the ink affects the amount of ink on the print. The viscosity of the ink is large, the amount of ink on the printed matter is large, and the viscosity is small, and the amount of ink on the printed matter is small.
4, the printing speed is fast and slow, affecting the amount of ink on the printed matter. The printing speed is fast, the amount of ink on the printed matter is large, the printing speed is slow, and the amount of ink on the printed matter is relatively small.
The plate cylinder is the determining factor in determining the amount of ink on the print. The viscosity of 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 known from the measurement, and the thickness of the ink is obtained by the perception. The two are closely related. Although the viscosity is not equal to the thick and thin, the viscosity and the thick and thin results are inseparable when measured with the paint cup and the Zahn cup.
For the sake of easy understanding, the following discussion is made by replacing the viscosity with thick and thin, that is, the viscosity is called thick, and the viscosity is small. Then, when the text and pattern made by the plate cylinder are deep, the ink needs to be thick, otherwise the ink is thin and there will be a ghost image, which is a halo phenomenon. On the contrary, the text and pattern made by the plate cylinder are shallow, and the ink is thin, otherwise it will be dry, that is, blocking. The printing speed is fast, the ink needs to be thin, otherwise the phenomenon that the ink is not clean will occur. The printing speed is slow, and the ink is thick, otherwise water marks will appear on the printed matter. The phenomenon of running ink, knife line, eating ink, and dry drying all have a lot to do with the ink too thick.
Summarize the above to get four sentences:
The plate pattern deep ink should be thick;
The printing plate light ink needs to be thin;
The printing speed is fast and the ink needs to be thin;
The printing speed is slow and the ink needs to be thick.
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