Three aspects of water-based ink instability

I. Precipitation of ink pigments. Before use, the ink in the ink tank should be evenly stirred, and the ink in the ink tank should be often stirred during the printing to prevent the print color and standard from having certain differences due to the precipitation of the ink pigment. An effective way is to use a fully enclosed scraper so that the ink is always in agitated and fluid state under the operation of the ink pump.

2. During storage and use, the pH value decreases (tend to be slightly alkaline) due to volatilization of the stabilizer in the ink composition. In the use of water-based ink stabilizer is volatile, so that the ink tends to be weakly alkaline, resulting in increased surface tension, the adhering force on the surface of the printing plate will be decreased, affecting the transfer performance and drying speed (ink more alkaline, dry Faster speed. This will result in the incompleteness of printing artwork in the printing process. Especially when printing the cable version, the ink is dried too quickly, causing the printing outlets to be lost or the cable version to be blocked.

3. In the use of ink due to the volatilization of water, resulting in increased ink viscosity, flow properties weakened. Some ink supply methods for printing equipment are single-squeegee systems that require the ink to have a certain degree of viscosity and fluidity so that it is in a relatively suitable range. When the ink in use in the degree of clarity and fluidity exceeds the requirements of the printing use, it will affect the ink transfer performance, there is a large solid surface printing print "color."