Adjust ink viscosity solution

In plastic printing, the viscosity of the ink has a great influence on the printing quality. By adjusting the viscosity of the ink, the printing effect can be effectively improved.

1. Hue Tune The viscosity of the ink becomes lighter, and vice versa. But you can't just adjust the viscosity to change the color, otherwise there will be other problems, such as water lines, color no gloss and so on. In the color adjustment, it is necessary to grasp the variation of the viscosity of the different colors in order to make better use of the viscosity. For example, when the primary yellow color has a large viscosity, there is a side that is biased toward red, and when the viscosity is small, green color appears; the green viscosity is large and the blue phase is small, and the viscosity shows a yellow phase.

2. Watermark This problem is generally also closely related to the printing speed, the lower the printing speed, the greater the required ink viscosity, and vice versa, the smaller, if the speed and viscosity is not good with the watermark is easy to appear. Usually the printing speed is basically fixed, so the water lines are solved by increasing the ink viscosity. Another phenomenon is very similar to the water pattern. If you do not carefully observe and analyze it, it is easy to solve it like a water mark. To solve it with increasing viscosity, the result is not effective (or the opposite effect). This is something that many people will Ignored. I have personally contacted many printers and they often make mistakes. The difference between the water pattern and this phenomenon (temporarily called "flower") is that the watermark shows a very short and short line, while the "flower" shows a round dot. The solution is to reduce the viscosity of the ink, if it is too serious, it may be a problem with the quality of the printing plate or the ink. By adjusting the viscosity, the effect is only improved.

3. The small ink viscosity of the knife line can prevent knife lines from appearing to the maximum extent. Especially when printing in gradation printing, these knife lines have not been printed, or are very small, and it is more and more serious that they have not been printed for a long time. There is also a case where the cut lines appear in the meshed position and they are all at the starting point.

4. The squeegee effect has a large viscosity, and the squeegee effect is not good (refers to the fact that the squeegee is not clean). In particular, for the black ink, a smaller viscosity is generally used to prevent the scraping from being unclean.

5. Overprint defects include two kinds of situations: one is that the latter color ink dissolves the previously printed color, so that discoloration or smearing, ghosting, at this time should increase the ink viscosity of the latter color; the other case The ink of the latter color is not the ink of the previous color, and at this time, the viscosity of the ink of the latter color must be adjusted.

6. When the ink is transferred to print a shallow web, the lower viscosity is very beneficial to improve the ink transfer and avoid the occurrence of poor "white spots". As can be seen from the above, viscosity has a close relationship with many printing problems, and mastering the adjustment of viscosity can solve many problems.