Gravure water-based ink is still waiting in East Asia
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
Once at the exhibition, I talked with a general manager who made a gravure electronic engraving machine. When asked about the use of electronically engraved intaglio printing ink cones, is it more difficult to use a water-based ink with a large cohesive force? This stepped on his painful foot, immediately changed his face and said: "What is good for water-based ink, the color is not bright, and it is not environmentally friendly at all, it must consume a lot of heat to dry, and the overprint is therefore more inaccurate. !"
In the United States, especially in Europe, the color printed matter of plastic flexible packaging is very beautiful in design and the picture is very attractive. If you get it, you can see the thick dots, and the image resolution is not as good as the oriental gravure. Some of them are not the prints that we often see in exquisite and beautiful, but the Westerners are ashamed. Because the soft packaging of the East takes the Japanese people's delicate and magnificent printing effect, using the electronic gravure engraving machine, using the fast-evaporating benzene, EMK, petroleum-based solvent, the dry part can be shorter, even without heating the wind. And the ink has a very good printing effect on the white and the overprint.
In the printing plant of solvent inks, there are many difficulties encountered in changing to water-based inks. Firstly, the engraved gravure ink hole of the diamond knife can be used, the depth can reach 45-50μ, the oily ink cohesion is small and the specific gravity is light. In the printing, the ink can be pulled out at once, and there is a thick mountain ink layer due to the solvent. The rapid evaporation, so does not affect multi-color overprinting. Water-based inks have completely different personalities. The depth of ink holes should not exceed 30μ. Therefore, it is not advisable to use electronic gravure to engrave plates. It is advisable to use a shallow ink gravure plate with corrosive method to flatten the ink from the ink holes during printing. Pull out, while the flat and shallow ink layer is more favorable for hot air drying at high speed, in order to evaporate a small amount of alcohol (alcohol) and water in a short time, so that the pigment and the mordant resin are cross-linked and cured, which is beneficial to the connection. Down printing or surface printing white ink (viewed from the back). The water-based ink printing plate should be changed, the ink should be changed, and the pigment content should be less than 20%. In general, the drying and blowing of the drying process should be increased, and the temperature should be above 45 °C. If the speed is 120 meters per minute, the temperature should be To rise to a high temperature of 70 ° C, the dimensional stability of the plastic is relatively unfavorable. Moreover, the water-based gravure ink is mainly distilled water or deionized water, and the alcohol content of ethanol, isopropyl alcohol and the like must be less than 30%, which can be regarded as water-based ink. Therefore, it is said that the use of water-based ink is not necessarily low-energy. It is more environmentally friendly, because the heating temperature is too high to make the ink dry, and the corrosive platemaking waste liquid treatment is also a very difficult problem. About 10% of Japan uses water-based gravure soft packaging.
In Europe, it is not a water-based gravure to print flexible packaging, but a flexographic printing plate. It is easy to make plates, and the ink layer is not as thick as a gravure. It is believed that European environmental regulations are strict and require Regarding pollution-free production, it is still possible for Asia to go to flexographic ink printing in the future, and it is also in response to environmental protection requirements.