Briefly describe the role of pH meter in monitoring the acidity and alkalinity of paper
PH meters and conductivity meters can often be applied in the printing industry and can reduce printing costs through reasonable application. Therefore, printing companies actively use pH meters and conductivity meters to reasonably control the pH values of paper and fountain solution before printing. Not only can it improve printing quality, but it can also reduce consumables and lower costs.
The balance of ink and water in the printing process, the drying performance of ink, and the quality of the ink layer are very important. Therefore, it is necessary to use industrial pH meters and other devices to monitor the acidity and alkalinity of paper, in order to avoid the low pH value of paper and inhibit the oxidation polymerization reaction and drying speed of ink. The printing industry uses pH meters to control the acidity and alkalinity of paper as much as possible and improve printing quality.
What are the effects of excessive alkalinity on paper? Excessive alkalinity of the paper may cause a change in the acidity of the fountain solution, thereby weakening the hydrophilic adhesive layer acidity of the non graphic and textual parts of the printing plate. The decrease in hydrophilicity of non graphic parts can cause an imbalance in ink and wash, resulting in a decrease in ink coloring power, dull color of printed graphics, patterns, and paste. It can be seen that controlling the pH of paper is of great significance in the printing industry, and pH meters have become the best helper.
In addition to using a pH meter to monitor the acidity and alkalinity of paper, it is also necessary to use a pH meter and conductivity meter to detect and control the relevant parameters of the fountain solution. Excessive acidity of the plate lubricant can cause corrosion and damage to the blank areas of the printing plate, resulting in dirt on the plate. However, excessive alkalinity can lead to corrosion of ink and paper. Therefore, it is necessary to control the acidity and alkalinity of the fountain solution, especially to pay attention to the pH value of the buffer in the fountain solution. In addition, it is necessary to control the hardness and temperature of the water to avoid water affecting the pH value of the fountain solution. The conductivity of the lubricant also has a significant impact on the pH value.
