[Printing Technology] How to use water-based ink?
After investigation, good soft pack factories for water-based ink generally follow the following six principles:
1. Mostly used in India
General water-based gravure inks have the disadvantages of no light, ash and low density. It is mostly used in printing in printing, which can achieve the characteristics of clear text, complete dots, strong color development, and distinct layers.
2. Appropriate shallow version
On the one hand, the water-based system results in the ink having the rheological characteristics of Newtonian fluid, and the ink transfer volume is more than 15% larger than that of the solvent-based ink; on the other hand, the solid content of the aqueous ink is high, and the thickness of the dried ink film in the same area can be smaller. Therefore, it is recommended to sculpt lighter ink holes with the same surface area.
3. Add defoamer
The water-based ink is weakly alkaline, and bubbles are more likely to be generated during the printing process than the solvent-based ink. Quality defects such as white spots and trachoma appear on the printed product, so about 1% of defoamer can be added.
4. Control the drying temperature
Water-based inks are mainly volatile and dry, and are equipped with certain reaction drying. The resolubility of the dried ink film is worse than that of solvent-based inks. Therefore, the temperature control of hot air is very important. If the temperature is too low, the ink surface layer is dry, but the internal drying is not transparent, and the reverse adhesion occurs during color registration. The temperature is too high, and the ink drying speed is fast, the dry ink layer can no longer be dissolved in water, and cleaning is difficult.
5. Don't mix
Water-based ink can not be mixed with other solvent ink, otherwise, it will cause quality problems.
6. Add corresponding additives
Since both alcohol and amine are volatile, the PH value of the ink is prone to change, and it is important to add the corresponding additives frequently during the printing process.
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