There are foreign matters in the most popular wate

2022-09-23
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There are foreign matters in the water wool jacket, which makes the ink color of the print vary in depth.

sometimes in offset printing, the ink color of the print is deep in front and shallow in back or shallow in front and deep in back (in terms of pressure, it is heavy in front and light in back or light in front and heavy in back), which affects the quality of the print. For the reasons for these phenomena, there is a phase loss in the lower A.3 phase circuit; b. The transmission mechanism causes the mechanical and electrical load aggravating surface. The standard sample in our ISO is type 1A multi-purpose sample with end tabs removed. They analyze the influence of rollers, ink rollers and water rollers

1. the center of gravity of the drum tends to the middle side of its mouth, which is deep in the front and shallow in the rear, that is, heavy in the front and light in the rear; If it is inclined to drag the tip, it is shallow in the front and deep in the rear, that is, light in the front and heavy in the rear. This is caused by the inconsistent pressure at its mouth and trailing tip when the drum rolls. The side point with heavy pressure increases and the ink is dark; On the side with light pressure, the dot shrinks and the ink is light

2. the radius of the printing surface of the drum can also be caused, such as wrinkles in the liner of the drum, or the poor quality and inconsistent thickness of the liner, so that the pressure will not cause the ink depth. "Flammable" is a common problem of epoxy resin and even most high molecular materials

3. The pressure between the inking roller and the inking roller is too light, resulting in uneven ink transfer, which is sometimes large or small. In particular, the pressure between the inking roller and the inking roller and the printing plate must be adjusted evenly, not light at both ends and heavy at the same time. Special attention should be paid to the pressure between the inking roller and the printing plate is greater than that between the inking roller and the inking roller, so as to facilitate the separation and transfer of ink

4. the diameter of the inking roller should not be too small, otherwise the ink transfer volume cannot meet the demand of printing text

5. the surface of the inking roller is aging, and the pores have become smooth, resulting in uneven ink transfer, which is prone to the failure of inconsistent ink color before and after. This kind of ink roller can be ground under the condition that the diameter is allowed, so as to roughen the surface and increase the adsorption and transmission performance of ink. Pay special attention to carefully wash the ink roller after printing the gloss. (the gloss oil remaining on the ink roller is easy to mirror the surface of the ink roller and fill the pores on the ink roller. In serious cases, the rubber on the ink roller will be pulled out, resulting in the scrapping of the ink roller)

6. The water roller and the printing plate pressure and the water roller and the water roller are inconsistent with the pressure adjustment of the water roller and the water roller, causing the water filling to fluctuate, affecting the absorption of the ink on the plate

7. the uneven water feeding caused by the bending of the water roller should be replaced in time

8. When installing the water jacket, there are foreign matters, which cause the radius of the water roll to change, affecting the uneven feeding of water

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