Adjust ink viscosity to solve problems
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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
The viscosity of the ink is lighter and the color is darker. But you can't change the viscosity to change the color, otherwise it will cause other problems, such as water, color and dull. In the case of color grading, it is necessary to grasp the change tendency of the viscosity of different colors in order to make better use of the viscosity. For example, when the viscosity of the primary color yellow is large, there is a side that is biased toward the red color, and the viscosity will show green when the viscosity is small; the green viscosity is mostly blue, and the viscosity is small to show the yellow phase.
2. Water pattern
This problem is generally closely related to the printing speed. The lower the printing speed, the greater the viscosity of the ink required, and vice versa. If the speed and viscosity are not well matched, the water ripple is likely to occur. Usually the printing speed is basically fixed, so the watermark is solved by increasing the viscosity of the ink. Another phenomenon is very similar to watermark. If you don't carefully observe and analyze it, it is easy to solve the watermark. It is solved by increasing the viscosity, but the result is no effect (or the opposite effect). This is a lot of people will Ignored. I have personally contacted many printers, and they often make this mistake. The difference between the water pattern and this phenomenon (temporarily called "flower point") is that the water pattern shows a short, short line of dots, while the "flower point" shows a round dot shape. Solving the flower point is to adjust the viscosity of the ink. If it is too serious, it may be a problem with the quality of the plate or the ink. By adjusting the viscosity, it only plays a role in improving the effect.
3. Cut line
Smaller ink viscosities minimize the appearance of cut lines, especially when printing layers, these cut lines are not printed, or very small, and they become more and more serious without printing. In another case, the cut lines appear in the textured position and are at the starting point.
4. Scrape effect
The viscosity is large, the ink scraping effect is not good (referring to the scratch is not clean), especially for the black ink, generally a small viscosity is used to prevent the scratching.
5. Poor overprinting
There are two cases: one is that the ink of the latter color dissolves the previously printed color, causing discoloration or tailing and ghosting, and the viscosity of the ink of the latter color should be increased at this time; the other case is the latter color. The ink does not print on the ink of the previous color. At this time, the viscosity of the one-color ink should be adjusted.
6. Ink transfer
When printing shallow nets, the smaller viscosity is beneficial to improve the transfer of ink and avoid the appearance of undesirable "small white spots". It can be seen from the above that the viscosity is closely related to many printing problems, and the adjustment of the viscosity can solve many problems.