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Is the viscosity of water-based ink important?

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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