Is the viscosity of water-based ink important?
author: Uvink
2023-04-03
The viscosity of water-based ink is a very important property in ink fluidity. The viscosity
is mainly determined by the components of the ink itself. If the viscosity of the ink binder
is high, the viscosity of the ink is also high, the type and amount of solvent in the ink,
the proportion of the pigment, the particle size and its dispersion in the binder, the sum
of these factors forms the difference in ink viscosity . If the amount of pigment is large.
The viscosity of the ink made is large, the viscosity of the ink with large pigment
particles is small, and the viscosity of the ink with good pigment dispersion is small.
Water-based ink plays a big role in the printing industry, and viscosity is the size of the
cohesion of water-based ink, and it is also the most important operation control target in
the application of ink. The effect of workshop temperature on printing quality is that the
relative humidity is 60%~85%. When the temperature difference between winter and
summer is large, the viscosity is most sensitive. When the temperature is high, the water
evaporates quickly and dries quickly. When operating, it is necessary to pay attention to
prolonging the drying time or increasing the machine speed; when the temperature is low,
the water evaporates slowly and the ink dries slowly. Turn on the dryer. When using in
winter, because the ink is easy to freeze below 0°C, if the ink is frozen, it can be placed
in a room with a high temperature, let it dissolve naturally, and can be used after stirring evenly.
In actual production, when using a printing machine with a doctor blade, the amount of
digital printing of the ink when the temperature is too low is not as stable as when the
temperature is slightly higher. As the temperature of the ink increases, the viscosity will
decrease, and as a result, the density of the printed matter will decrease and the ink layer
will become thinner. To maintain consistent print quality, it is necessary to maintain consistent
ink viscosity. The printer must attach great importance to the influence of the ink temperature,
and the temperature of the ink should be stabilized at the temperature of the printing workshop
before printing. This measure is very important, otherwise the ink density will
change significantly during printing.
Viscosity is one of the important quality indicators of water-based ink, and it is also
an important factor in determining the printing quality. If the viscosity of ink is too low,
it will easily cause poor transferability, insufficient ink supply, uniform stripes, insufficient ink
transfer, and white spots on the printed product; if the viscosity is too high, the printed text
will be unclear, paste, and the amount of transferred ink will be too much As a result,
the ink film is too thick, prone to discoloration, difficulty in infusing and other disadvantages.
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