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Water-based ink is a mixture of organic pigments, binders, solvents and related additives through physical and chemical processes.
The main difference with solvent-based inks is that the solvent used in water-based inks is not organic solvents but water, which means that water-based inks The binder is mainly composed of resin and water
.
In order to print an ideal effect, ink and wash need to have the workability suitable for printing
.
There are many factors that affect the printing suitability of water-based inks.
The following mainly analyzes the influence of the viscosity, thixotropy, tackiness, pH value and ink absorption of paper on the printing suitability of the ink
.
Viscosity is the cohesive force of the ink, and it is the most important control index in the application of ink
.
For offset printing inks, the ink can be evenly coated on the printing plate through the reconciliation between the ink rollers, and the flexographic inks are also filled in the anilox roller cells by its own fluidity and adhesion.
The ink is transferred to the printing plate, and the ink needs to fill the cells in a short time.
Difficult to transfer and transfer ink
.
It is easy to cause the paper to fuzz, powder off, and even cause the paper to peel; the
ink is difficult to fill the mesh, and the scraper is also difficult to smoothly scrape the ink on the mesh wall
.
Practice has proved that under the same conditions, the split state of the ink layer with low viscosity is more beneficial to the transfer of ink than the one with high viscosity
Therefore, the flexographic ink generally has a relatively low viscosity, and its range is: 0.
15～0.
Generally, for relatively smooth substrates, when the ink supply is sufficient, the transfer rate is higher, so the viscosity of the ink is required to be slightly higher; for the paper with soft structure, the viscosity of the ink should be slightly lower
.
In actual production, when using a printer with a squeegee, the ink transfer volume when the temperature is too low is not as stable as when the temperature is slightly higher
.
