Once at the exhibition, I talked to a general manager of a gravure electronic engraving machine. When asked about the use of electronically engraved intaglio cones, is it more difficult to use water-based printing inks with greater cohesion? When he stepped on his sore foot, he immediately changed his face and said, "What is good about water-based ink? The color printed is not bright, and it is not environmentally friendly at all. It must consume a lot of heat to dry, and the overprint is more inaccurate. ! "
In the United States, especially in Europe, the color printing of plastic flexible packaging is very beautiful from a distance, and the picture is also very attractive. If you get it, you can see the thick dots, and the image resolution is not as detailed as the Oriental gravure, and the color is also Obscure, it is not that we are used to seeing exquisite and bright gravure printing, but Westerners are as happy as they are. Because the flexible packaging of the East takes the delicate and magnificent printing effect of the Japanese, using an electronic gravure engraving machine, using benzene, EMK, and petroleum-based solvents that evaporate quickly, the drying part can be shorter, even without heating air. And, the ink has a very good printing effect on the white background and overprinting.
In the printing plant of solvent ink, if you want to change to water-based ink, the difficulties encountered are many. First, use a diamond knife to engrave the gravure ink hole, the depth can reach 45-50μ, the cohesion of the oily ink is small and the weight is light, the ink printed in the hole can be pulled out at once when printing, and there is a thick mountain-shaped ink layer, due to the solvent The rapid volatilization, so it does not affect multi-color overprinting. Water-based inks have completely different personalities. The depth of the ink hole should not exceed 30μ, so it is not suitable to engrave the printing plate with electronic gravure. It is better to use the etching method of shallow ink hole gravure printing plate, so that the printing ink can be flattened from the ink hole during printing Pull out, while the smooth and shallow ink layer is more conducive to hot air drying at high speed, in order to evaporate a small amount of alcohol (alcohol) and water in a short time, cross-link and solidify the pigment and mordant resin, which is conducive to the connection Print down or print white ink on the surface (viewed from the back). The water-based ink printing plate should be changed and the printing ink should be changed. The content of the pigment is about 20% less. The air blowing and air absorption in the general drying process are increased, and the temperature should be above 45 ℃. If the speed is 120 meters per minute, the temperature To rise to a high temperature of 70 ℃, it is relatively unfavorable for the dimensional stability of plastics. In addition, the water-based gravure printing ink is mainly distilled water or deionized water. The alcohol content of ethanol, isopropanol and other alcohols must be below 30% to be regarded as water-based printing ink. Therefore, some people say that the use of water-based ink is not necessarily low energy consumption. It is more environmentally friendly, because the heating temperature can make the ink dry, and the treatment of corrosive platemaking waste liquid is also a very difficult problem. About 10% of Japan uses water-based gravure printing flexible packaging.
Europe does not use water-based gravure to print flexible packaging, but flexo printing with optically sensitive resin plate, so plate making is also relatively easy, and the ink layer is not as thick as gravure and not easy to dry. I believe that European environmental regulations are stricter and require In terms of pollution-free production, it is still possible for Asia to go to flexographic ink printing in the future, which is also due to environmental requirements.
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