Analysis of Fountain Solution in Printing

Purpose

Fountain solution contains particles, and it is important to know their size. pH and conductivity, along with hardness, are also measured. The amount of isopropanol and organic acids is commonly analyzed in fountain solution.

Method

• pH Value The pH value is a crucial parameter for the efficiency of fountain solution. A correct pH value, typically between 4.5 and 5.5, ensures that the fountain solution works properly and that the ink adheres correctly to the image areas of the printing plate. An excessively high or low pH can cause emulsification, where the ink and water mix in an undesirable way, leading to printing problems and poor quality.
• Conductivity Conductivity measures the ionic strength of the fountain solution and indicates the amount of dissolved salts and impurities. Optimal conductivity is essential for the fountain solution to function correctly and to prevent issues such as calcium deposits and toning. Regular measurement of conductivity helps identify and correct any deviations in the chemical composition of the water.
• Hardness The hardness of the water, measured by the concentration of calcium and magnesium ions, also affects the performance of the fountain solution. Hard water can lead to scale buildup, which can block the printing system and degrade print quality. Softer water is often preferred in printing presses to minimize these risks.
• Isopropanol Isopropanol is a common additive in fountain solution because it helps reduce surface tension and improve wetting ability. It is important to monitor the amount of isopropanol in the fountain solution to ensure it remains within the correct range. Excessive concentration can cause health and environmental issues, while insufficient concentration can reduce the effectiveness of the fountain solution.
• Organic Acids Analysis of organic acids in the fountain solution, such as citric acid or tartaric acid, is important because these acids can affect the pH balance and thus the performance of the fountain solution. Organic acids can also act as buffers to stabilize the pH value and improve print quality.

Delivery

RISE offers a report that includes data in Excel format and relevant images and diagrams. It is carefully compiled using standard methods for the conducted analyses. The report also includes an assessment of measurement uncertainty to ensure the reliability of the presented results. All relevant parameters significant to the specific analysis are included to provide a comprehensive picture of the situation. Additionally, detailed comments and explanations are provided to offer further insight and understanding of the presented data.