Exploration of Common Problems in Printing Machine Sink Liquid (2)

Choosing the appropriate bath fluid concentration is based on the conductivity value. When the conductivity is too high, the ink will not dry easily. If the conductivity is too low, the ink will be easily printed or accumulated. Therefore, it is necessary to try to find the proper conductance value. When the concentration value is found, multiplying the total sink volume by the percentage is the first addition. In addition, when the value of conductance changes by more than ±50~100, it is necessary to make corrections before continuing to use it. At the same time, it is also necessary to pay attention to the temperature in the tank, because the temperature will affect the measured value of conductance. General recommendations The ideal printing water conditions are: (1) Water quality needs to be soft water; (2) Conductivity value 700 to 1300 (water conductance value must be deducted); (3) PH value 4.0 to 5.5; (4) Flume temperature 5 °C ~ 15 °C; (5) The degree of emulsification is less than 35%; (6) The proportion of alcohol IPA is 5% ~ 15%; (7) The ratio of bath fluid concentration is 1.5% ~ 2.5%. The following are the results of the actual testing conducted by the Centre in the printing laboratory: Fluting liquid: Magic 150 Conductivity meter: Delta OHM Conductivity Meter Model: HD 8706 PH meter: HANNA PH Meter Model: HI 8521 From the above example, the central printing laboratory Total 80,000 cc*2% = 1,600 cc of water tank fluid in the printer tank, conductivity value maintained at 1,000 (1,095-92.5) ± 100, pH about 5.0. In addition, we found that the pH value did not change significantly after 3% of the bath fluid concentration, so it was not easy to detect whether the amount was appropriate, and some European-based bath fluids added more buffering agents, and its function was to maintain the stability of the bath fluid. The acidity and the reduction of the layout are corroded, and therefore there is a problem in using the pH value to obtain the bath liquid concentration. If there are problems with sink fluid, please contact our center. Source: Press Capability Training Course for Captains of Printing Research Center - Zhang Zhongyi Printing Research Center publishes "Printing Industry Total Quality Assurance Manual" - He Keming Printing Research Center publishes "Lithograph Printing Manual" Hong Kong and India Institute of Printing Materials Testing and Analysis Center "Printing Space" Vol.12.