In the flexographic plate making process, what we need to get is a plate with stable surface tension. Only when the surface tension of the printing plate is stable, can we establish a reliable platform that matches the surface tension of the ink. So, how does the plate-making process ensure a stable surface tension for the flexo printing process? In fact, in the flexographic plate-making process, there should be a way to stabilize the surface tension of the printing plate. Follow the requirements of the flexible version supplier Strictly follow the procedures of environmental protection solvent distillation, measurement and compensation provided by the flexographic supplier. Do n’t take the shortcuts for short, take short paths, but will take detours and go the wrong way. The question is how to use the solvent under the premise of protecting commercial interests. The method provided by the supplier does have some clouds, but it is the only feasible way to do it first. It is necessary to strengthen the monitoring of the surface tension of the printed plate. The simple and practical method is to use a corona pen to test, and supplemented with a high magnifying glass to check the smoothness of the depressed area of ​​the plate. The solubility of the plate washing solvent is stable The traditional plate-washing solvent of tetrachloroethylene-n-butanol is unique in its solubility stability, but the toxicity of tetrachloroethylene is too high. From the standard of "flexo printing is recognized as an environmentally friendly printing method", use Tetrachloroethylene washing is really not supposed to be. But in addition to the factor of solvent cost, is there any reason to use this method to wash the plate, and the stability of plate-making quality is indeed superior? This is like the gravure industry always feels that toluene inks have better printability than benzene-free and ketone-free inks. What we should get from this method is the idea that the mixed solvent must be measured and supplemented directionally, and what is discarded is that the solvent is not environmentally friendly. Wash the plate with a water-soluble solution The organic solvents contained in the water-soluble plate washer have high boiling points and are not easily volatilized. Moreover, because they are mixed with water with a large latent heat of evaporation, the problem of the overall balance of the solvent is masked, and the contradiction is not prominent. However, the water-soluble plate-washing solution is to dissolve the uncured resin in it, so as the solids increase, the concentration will also decrease, and the decrease in solubility will rely more on the action of the brush to increase the surface tension of the printing plate. The surface tension of the plate will also fluctuate, which must be paid attention to. After the water-washed version is made, it is said that contact with ethanol is safe, and the printing plate does not swell. However, after swelling is found in practice, the supplier recommends that instead of ethanol, use a 1: 1 mixed solvent of isopropanol and methanol. This case shows that our research on the water-washed version is still necessary. Moreover, the toxicity index of water-based additives is not optimistic. Thermal plate-making technology The plate-making process that can truly get rid of the interference of plate-washing liquid (including organic solvents and water-based solvents) on the surface tension of the printing plate is thermal plate-making technology. The feature of this plate-making process is that the uncured photosensitive resin is changed from solid to liquid by heating, and then its surface is pressed with a pressure roller, similar to the gravure transfer unit that uses a platen roller to press The same as the ink suction, the non-woven fabric wrapped on the pressure roller will suck the liquefied resin on the printing plate to complete the separation of the cured and uncured photosensitive resin. The surface tension of the thermal plate completely reflects the characteristics of the solid itself, avoiding the effects caused by the process of dissolution and desorption of the solid material by the plate washing solution, and avoiding the fluctuation of the surface tension of the printing plate during the plate making process. The thermal version is able to withstand criticism in terms of environmental protection, but the operational data provided by the thermal version supplier now makes the printing plate much less precise. At the same time, the size of the pressure is also a problem. Too much pressure will collapse the edge of the dot and affect the accuracy of the dot. In addition, the surface characteristics of non-woven fabrics are not simply a matter of long fibers and short fibers. We are more concerned about their ability to adsorb liquid resins. In general, the thermal plate-making technology is further refined and improved, while obtaining a fine printing plate, while ensuring the surface tension of the printing plate is stable, this is what we need. When the plate-making process can provide a plate with stable surface tension for the flexo process, the next problem is ink. Our goal is to need an ink that effectively matches the surface tension of the printing plate, whether it is solvent-based ink, water-based ink, or UV ink. This stick should and can be handed over to the ink world. It help you create a gorgeous look, or split hair. 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