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1. Fountain solution additives
The fountain solution additive is a special composite component that directly affects the properties of the fountain solution. Among them, the pH buffer agent is particularly important.
Tap water is usually neutral. In order to achieve the required pH of 4.3 to 5.5 for printing, it is necessary to add acid to the fountain solution to reduce the pH of the fountain solution, and the acid will quickly react with the carbonate in the water. The reaction, in turn, raises the pH. At this point, a pH buffer is required to maintain the pH of the water at a stable level. The amount of pH buffer depends on the level of carbonate in the water. The stronger it is to carbonate, the more stable the pH is. For the external influence on the pH of fountain solution, such as the composition of the paper, cleaning agent, etc., the role of pH buffer is also very significant.
The content of Huacong Fountain Solution additive is between 2% and 3%, which is compatible with the requirement of the fountain solution's pH value to be stable at 4.3-5.5.
2. Water hardness
The fountain solution used in printing consists essentially of fountain solution, water, alcohol (isopropanol), etc. The combination and mutual influence of these three factors determine the final use effect of the fountain solution.
The hardness of water is determined by the content of metal cations (Ca+, Mg+), the content of negative ions (HCO3-), and the water temperature. We usually use soft water and hard water. Hard water contains more metal cations, will increase the pH of the fountain solution, and softwood will reduce the pH to a certain extent, so according to the actual use and the nature of the fountain solution to select and adjust the water hardness, General hardness of about 10 degrees is appropriate. The fluctuation of water temperature will cause the concentration of ions in the water to change, which will cause the pH of the fountain solution to change, which will affect the wetting effect and cause problems such as bad ink and dirty plate. Therefore, it is necessary to control the hardness of the water so that the fountain solution exerts the best performance.
3. Conductor conductivity
Increasing the concentration of the fountain solution, increasing the water hardness, or increasing the water temperature will increase the conductivity of the fountain solution and reduce the pH of the fountain solution. On the contrary, isopropanol will reduce the conductivity of the water and increase the viscosity of the fountain solution. The pH of the liquid.
In order to ensure the pH of the fountain solution, it is important to control the hardness of the water and the conductivity of the fountain solution. You can either use a tap water treatment unit to soften the water and lower the total hardness. You can also use desalinated water to remove all salts in the water.
Using print process standards, it is important to accurately meter the contents of softeners, fountain solution additives, and isopropyl alcohol. However, the method of determining the additive content of the fountain solution based on the pH value to be achieved is wrong. This may cause excessive usage and high additive concentration, resulting in a series of problems in the printing process, such as emulsification and poor ink drying. Wait. Similarly, the use of a single conductivity metering fountain solution additive is also inaccurate. This method is only applicable to new fountain solutions because the conductivity may change under the influence of the outside world.
Since the metering of the softening agent and fountain solution additive is a continuously repeated process, the pH and conductivity should be regularly tested and added in an appropriate amount according to actual conditions to ensure that the fountain solution is stable in an ideal state.
Factors affecting the pH of the fountain solution
As we all know, the pH value of the dampening solution that is favorable for printing should be 4.3 to 5.5. This dampening solution will make the printed dots clear, the printing plate will be more hydrophilic and can prolong its service life. The ink drying effect is more ideal and will not be dirty. The plate is dirty or dirty, and it can reduce the invasion of bacteria and other impurities, and better maintain the balance between water and ink. If the pH is lower than 4.3, the plate, ink, and paper are easily damaged; if the pH is higher than 5.5, smearing and smearing failures are likely to occur. What are the factors affecting the fountain solution pH?