Why does alcohol-free fountain solution focus so much attention? Just because IPA (isopropyl alcohol) costs more, hurts rubber rollers, and is neither environmentally friendly nor safe, these defects have become increasingly unsuitable for the needs of printing “green and environmentally friendly, cost controlâ€. The use of alcohol-free printing is more "green and safe" because it is alcohol-free. And alcohol-free fountain solution itself consumes less, with very thin ink film to get clearer ink dots and brighter color reproduction, the paper dries faster and does not hurt the rubber roller. The role of rubber rollers in printing is very important. There is a first oil poem that vividly explains the role of rubber rollers-"The roller is good, just live, the printing is like, the business is great." Therefore, it does not hurt the rubber roller, not only can extend the service life of the rubber roller, but also can have an intuitive impact on the quality of the printed product. But switching to alcohol-free printing is not a smooth thing. Looking back at some failed cases, we believe that the two keys to alcohol-free printing are to solve the problems of surface tension and the viscosity of fountain solution. Let me share some of our experiences and experiences with you on these two points.
1. Surface tension: Alcohol is added to conventional fountain solution to reduce surface tension. After alcohol-free, the surface tension should be carefully adjusted between 30º ~ 35º, which should have the same performance characteristics as when printed with isopropyl alcohol.
2. Viscosity: When alcohol-free operation, the viscosity of the fountain solution becomes thinner. If the printing machine is not adjusted, the dampening system will not be able to adequately supply the fountain solution to the printing plate, and the delicate water-ink balance is broken. However, if we can carefully and patiently adjust the pressure between the rubber rollers, we can help the dampening system to let more fountain solution pass through, and as the alcohol is removed, the rubber of the dampening rubber roller will gradually soften until it returns To the initial design hardness, the water level measurement will slowly decrease to the best state.
We vividly call alcohol-free printing "top-down reform." In other words, one of the premises of using alcohol-free printing is the top-down determination of the enterprise. This is almost a "leadership project." The first thing to be solved is the entire ideological and cognitive problem. Recognized and solved, the others are easy to handle. What kind of machine time, execution steps (with experts), employee training, etc. are not problems. Under the guidance of experts, adhering to the three principles of "careful adjustment; patient adjustment; correct method", alcohol-free printing must be able to debug successfully.
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