In the composite bag printing process, the color ink film color bags depends on the transfer rate and the concentration of the ink in the printing operation. For some specific substrates or specific working inks, the concentration of the working ink is relatively fixed, the transfer rate depends on the ink viscosity and other factors, and is also affected by printing speed and other factors.
1. Change of temperature and humidity
If the room temperature and the ink liquid temperature change significantly, the migration state will change, and the color tone will change accordingly. This is because the temperature change affects the ink viscosity. At the same time, the high temperature and low humidity dry weather will have a significant impact on the ink transfer rate of the high-gloss parts.
Therefore, when printing high-end products, the temperature and humidity of the printing workshop must be controlled anyway. In addition, it is necessary to pre-heat the ink in winter to reduce the temperature change of the ink itself.
2. Separation of synthetic colors
This kind of scene is prone to occur in various colors of different colors such as light colors and organic colors and inorganic pigments. Especially when the ink flow in the ink tray is too slow, the precipitation will promote the separation of the synthetic color, so pay attention to making the ink circulation smooth.
In addition, if the mixing is not sufficient during color adjustment, as the printing progresses, the density of a certain color tends to increase. Therefore, before the formal printing, a mechanical or other method such as a dissolver should be used to sufficiently stir.
3. The ink deteriorates and deteriorates the current color
Because of long-term printing, the composition of the ink solvent is changed, or the moisture in the air is mixed into the ink, which causes the ink to deteriorate and deteriorate the current color.
In order to prevent the temperature drop caused by the heat of vaporization, a slow-drying solvent can be used together. At high temperature and humidity, there may be a certain amount of moisture mixed into the ink, so when new things happen, new ink should be replenished or replaced completely. The remaining ink that has been used many times should be filtered or abolished regularly because it contains a lot of dust. .
4. The working viscosity and drying speed of the ink are changed
The change of the working viscosity of the ink can directly affect the color of the color printing bags. When the viscosity is high, the color density is relatively high, whereas when the viscosity is low, the color density is relatively low. This effect is sometimes obvious and must be highly regarded. Because of the requirements of the printing process, the working viscosity of the ink should be moderate. When the working viscosity of the ink is too large, it is not conducive to the transfer of the ink, and it is easy to produce a paste version. If the work of the ink is too small, the color of the printed product is prone to static electricity, which is not conducive to the control of the ink color.
The change in viscosity has a subtle effect on the migration area caused by ink migration or dot flow, especially in multi-color printing. Therefore, when the printing speed is positive, the viscosity of the ink is required to be consistent from beginning to end. It is best to use the automatic viscosity controller.
When the proportion of solvent in the ink changes, the drying speed of the working ink changes, which in turn affects the ink transfer rate and printing color. Regarding some inks with a small amount of use, after a period of use in the ink tank, the natural volatilization of the solvent will not only affect the working viscosity of the ink, but also affect the proportion of the solvent and the rate of volatilization.
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