Fountain Solution for Offset Printing

The role of fountain solution in printing: (1) Emulsify water and ink appropriately. Due to excessive emulsification, the color paste in the ink will be diluted, causing a "water window" phenomenon in the printed product; (2) Protect the PS version. Because the diameters of the printing plate cylinder and the blanket cylinder are sometimes not exactly the same, and their linear speeds are different during printing, the phenomenon of "dry grinding" appears at the "cut point" of the cylinder. At this time, the fountain solution has a lubricating effect and reduces the friction between the two; (3) Protect the blanket. The friction between any objects will generate heat. Because the PS plate is made of aluminum and has a large thermal conductivity, the heat has little effect on it, while the blanket is the opposite. At this time, the function of the fountain solution is to reduce heat generation and protect the blanket; (4) Make the non-graphic parts of the printing plate not inked. Offset printing is based on the principle of repelling oil and water. After the PS plate is exposed and developed, the surface sensing part (that is, the graphic part) can be attached to the ink, then the "dirty" phenomenon will appear at this time.