In the printing process of composite packaging bags, the ink film color of color printing bags mainly depends on the concentration and handling rate of ink in the printing operation. For some specific substrates or specific working inks, the concentration of working inks is relatively fixed, and the handling rate depends on the condition of elements such as the viscosity of the ink, and is also affected by factors such as printing speed.
Temperature and humidity change the room temperature, the liquid temperature of the ink such as a substantial change, the flow state will change, the tone will change. This is because the temperature change affects the viscosity of the ink caused by. At the same time, the dry climate of high temperature and low humidity will have a significant impact on the ink handling rate of the highlight part.
Therefore, no matter how to control the temperature and humidity of the printing workshop when printing products. In addition, when using ink in winter, it is necessary to preheat in advance to reduce the temperature change of the ink itself. This kind of scene is easy to produce in light colors and thick turbidity of different colors such as organic colors and inorganic pigments. Especially when the ink flow in the ink plate is too slow, the precipitation will promote the separation of synthetic colors, so we should pay attention to the circulation of ink.
In addition, if mixing is not enough when mixing, with the printing process, the concentration of a certain color has a tendency to increase, so before the formal printing should be used such as a dissolver or other methods for sufficient mixing. Because of long-term printing, the composition of the ink solvent changes, or the water in the air is mixed with the ink to cause the ink to deteriorate, making the color deteriorate.
