The thickness of the ink printed on the substrate has a great influence on the product quality. How to correctly control the thickness of the ink depends on many objective conditions, that is, the thickness of the ink should be based on the nature of the ink. Layout layout, climate, machine running speed, paper surface smoothness, etc. are considered, and then adjusted according to different situations.
1. The effect of ink thickness on product quality
In general, the thicker the ink and the greater its viscosity, the lower the fluidity of the ink. If the ink is too thick, the ink in the ink fountain is not easy to drop ink, and the ink on the ink roller is not easy to hit evenly, so that the ink on the printing plate cannot be kept uniform, and it is easy to accumulate on the printing plate, and it may cause paper shaving and other phenomena. If the ink is too thin, the viscosity is too small, and the fluidity is too large, it will make the printed product dull and dull, distorted, the dot deformation is enlarged, slurred, and it is also easy to cause smudging and other phenomena.
2. Refer to various objective conditions to flexibly control the thickness of the ink
1. Judging from the nature of the ink, magenta ink and black ink should be thickened, followed by cyan ink, yellow ink, light red, light blue and so on.
2. Judging from the distribution of graphics and text on the layout, when printing a large-area field version, the ink needs to be thinned, and the field version is printed flat, which is not easy to brush; but when printing the screen version, the ink is thicker to prevent the deformation and expansion of the dot , Confused.
3. From the climatic situation, when the temperature is high, the fluidity of the ink increases. Therefore, in order to properly control the fluidity of the ink, it should be thickened; when the temperature is low, the fluidity of the ink decreases, so it should be thin Some; when the climate is dry, the ink should be thinned appropriately.
4. From the machine speed, the machine speed is fast, the ink roller will generate heat when it is running fast, and the fluidity of the ink will increase, so the ink should be thickened; otherwise, the machine speed is slow, the heat generated when the ink roller is running Relatively lower, so the ink should be thinned appropriately.
5. Judging from the smoothness of the paper, when the paper surface is rough, the texture is soft, and the absorption is large, the ink should be thinned; on the contrary, the paper surface has high smoothness, close texture, and low absorption. It is easy to cause rubbish.
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