Solution of ink emulsification in printing process

When the ink and fountain solution are mixed, the fountain solution is evenly dispersed in the ink with tiny particles to form an emulsion. When the water content in the ink reaches about 20%, a "stable" emulsified state suitable for printing will be formed. If the water content is too high or the pH value of the fountain solution is too low, it will cause problems such as reduced ink dispersion ability, reduced fluidity, unstable emulsification, and ink accumulation. Different types of inks will produce emulsification in different conditions. Compared with general inks, synthetic inks, metallic inks, and fluorescent inks are more sensitive to water content and pH. The emulsified ink will delay the drying time and increase the risk of back printing.

Solution:
Correctly set the water-ink balance and continuously monitor it throughout the production process
When the ink has been emulsified, the ink roller should be cleaned and re-inked according to the correct water-ink ratio
Check the fountain solution and replace it on time (ideal fountain solution: raw water hardness 8dH ～ 120dH, pH value 4.8 ～ 5.5, temperature 10 ℃ ～ 150 ℃)
If you use Heidelberg continuous alcohol system, you should use water and ink separation printing or use ink roller to blow off to eliminate excessive water.
Try to avoid frequent pre / post dampening, especially during the printing and calibration stage, to avoid excessive water accumulation in the ink roller
Correctly adjust the ink roller
When printing small ink levels, adding extra ink stripes on the layout will help the ink balance.

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