With the continuous application of new technologies and the increasing awareness of environmental protection, benzene-based gravure inks have gradually faded out of sight. Instead, ester-soluble, alcohol-soluble inks, especially water-based inks, have been superior in recent years. The environmental protection has been stirred up by the industry. According to statistics, in developed countries and regions such as Europe and the United States, water-based inks have occupied 80% of the gravure ink market. At present, the domestic gravure ink market is still dominated by solvent-based inks, and the industry is still holding a wait-and-see attitude toward the application of water-based inks. Below, the author summarizes his understanding of water-based inks as follows, hoping to play a certain role in promoting its promotion and application.
The main advantages of water-based inks
(1) The solvent of the aqueous ink is mainly water and a small amount of alcohol, such as ethanol, butanol, isopropanol, etc. The role of the alcohol is to assist the water to enhance the ability to dissolve the resin, improve the dispersion properties of the pigment, and accelerate the penetration and inhibition. Foaming. The content of volatile organic solvents in water-based inks is very low, which greatly reduces the emission of VOCs, reduces air pollution, improves the working environment of printing operators, and is beneficial to the safety and health of employees.
(2) Although the original ink cost of the aqueous ink is slightly higher than that of the solvent type ink, the price of the main solvent used for water, water, is very low, and the practical application cost is comparable to that of the solvent type ink, even lower than the solvent type ink.
(3) At present, the manufacturing technology of domestic water-based inks has become mature (except metal inks), and the application technology is also constantly improving. In the traditional sense, water-based inks have the disadvantages of slow drying, poor gloss, water resistance, and imprinting. It has also been significantly improved, so the current water-based inks are more suitable for packaging and printing products with strict hygiene and quality requirements such as tobacco, wine, food, and medicine.
(4) Water-based inks can reduce the risk of fire and hidden dangers caused by static electricity and flammable solvents.
The main problem with water-based inks
(1) The key technology of water-based inks is resin amination, and the price of organic amines required for the amination process is relatively high. To reduce costs, ink manufacturers often add ammonia to replace or partially replace them, but the irritating smell of ammonia is very high. Large, not only affects the working environment, but also remains on the printed matter. The State Environmental Protection Administration has begun to limit the ammonia content in water-based inks in 2007. The limit for ammonia and its compounds is ≤3%, and it is clearly listed as a harmful substance. It can be seen that not all water-based inks meet environmental protection requirements, and food and drug packaging requires no irritating odor, and not all water-based inks can be used for packaging with high hygiene requirements such as tobacco, alcohol, food, and medicine. Printed.
(2) Compared with solvent-based inks, aqueous inks have a slower drying speed, especially for large-area solid color patches, and when printing on non-absorbent substrates (transfer paper, etc.), the drying speed is faster than solvent-based inks. Several times slower. In order to completely dry the ink layer, it is often necessary to increase the drying temperature; when the drying temperature cannot be increased, it is necessary to adopt a method of lowering the printing speed and sacrificing the printing efficiency.
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