Troubleshooting of Printing Press Sink Fluid
Sep 12, 2021
Exploring common problems of printing press sink fluid—The concentration of the appropriate sink fluid is based on the conductivity value. When the conductivity is too high, the ink will not be easy to dry, and if the conductivity is too low, it will be easy to stain or accumulate ink. So you must try to find the appropriate conductivity value. After finding the concentration value, multiply the total tank volume by the percentage to be the first addition. In addition, when the conductivity value changes more than ±50~100, you need to make corrections before you can continue to use it. At the same time, you need to pay attention to the temperature in the water tank, because the temperature will affect the measured value of the conductivity.
Generally recommended ideal printing water conditions are:
(1) The water quality must be soft water;
(2) The conductivity value is 700~1300 (the conductivity value of water must be deducted);
(3) PH value 4.0~5.5;
(4) The temperature of the water tank is 5℃~15℃;
(5) The degree of emulsification is below 35%;
(6) The proportion of alcohol IPA is 5%~15%;
(7) The concentration ratio of the tank liquid is 1.5%~2.5%.
The following are the actual test results of the center in the printing laboratory:
Sink fluid: Magic 150
Conductivity Meter: Delta OHM Conductivity Meter Model: HD 8706
PH meter: HANNA PH Meter Model: HI 8521
According to the above example, the total amount of 80,000cc*2%=1,600cc of the water tank of the printing press in the central printing laboratory has a conductivity value of 1,000 (1,095-92.5) ± 100 and a pH value of about 5.0. In addition, we found that the pH value does not change significantly after the concentration of the tank solution is 3%, so it is not easy to detect whether the amount is appropriate, and some European tank solutions have more buffers added, and their function is to maintain the stability of the tank solution. The acidity and the reduction of the corrosion of the layout will cause problems when using the pH value to measure the concentration of the bath solution.