The performance indexes of label printing ink mainly include hue, fineness, saturation, gloss, adhesion, viscosity, dryness and so on. These properties have a very important impact on the printing process and printing quality. Here highlights some of the performance indicators.
1. Stable viscosity
Stable ink viscosity is one of the prerequisites to ensure the consistency of printing quality. Too high or too low ink viscosity is not conducive to printing. Therefore, the control of ink viscosity is very important. Generally speaking, during the printing process, as the moisture and solvent in the ink continue to volatilize, the viscosity of the ink will gradually increase. Therefore, the viscosity of the ink should be measured frequently, and the viscosity changes should be recorded and adjusted in time.
2. Dryness
The dryness of the ink also has a great influence on label printing. If it is dried too fast, it will easily cause the pattern to lighten or even dry the plate; if it is dried too slowly, it will easily cause the ink to stick or the printed matter to stick. In general, the drying speed of the ink should be compatible with the printing speed, the drying capacity of the printing equipment, and the area of ​​the printed pattern.
3. pH value
For water-based label printing inks, the control of pH value is very important, generally between 8-9. The change of the pH value of the water-based ink will also cause the change of the viscosity. Therefore, every time during the printing process, an appropriate amount of pH stabilizer should be added to the ink.
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