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In Europe, especially in Germany, toluene-like aromatic solvents have been banned for food packaging inks. Similar to Europe, the United States has stricter environmental laws to control the release of volatile organic compounds. This has led to the development of more environmentally-friendly products for polymer and ink chemists for food packaging inks. Although the development of water-based gravure inks is more compatible with environmentally friendly products, although water-based gravure inks have attracted attention as an alternative to toluene-based inks, the printing performance and quality are still not up to the standard for solvent-based gravure inks.
This is mainly due to the higher surface tension of water, resulting in difficult to wet the ink, dry slowly, in order to make water-soluble ink can be used in gravure printing machine, not only ink and resin require advanced technology, but also need to improve the gravure printing equipment, For example, changing the depth of approximately 38 to 42 micron resist rollers into a laser platemaking drum with a groove depth of approximately 24 to 38 micrometers requires a more effective and powerful dry-air conditioning and drum, pump, and other components made of corrosion-resistant materials. At present, there is no popularization. The water-based flexographic printing inks currently used in the market are mainly used for the printing of paper and corrugated paper. The quality requirements are general and relatively easy to accept. They are widely used in Europe and America.
Since water-based gravure inks are not yet fully capable of replacing toluene-based inks, the ink industry has been working hard to develop problems that are easily caused by the health of the alcohol-soluble inks in the environment and the influence of solvent residues on the packaging quality. In Europe and the United States, this development has become a trend. In Singapore, South Korea and other countries, toluene inks are being eliminated and will be replaced by alcohol-soluble gravure inks. It can be predicted that in the near future, packaging inks in China will be the market for alcohol-soluble inks. 
The development direction of packaging ink - alcohol ink
Since the 1970s, as snack foods have become more popular, many flexible substrates have been developed to package and protect foods such as PE, PP, OPP, PET, NYLON, etc., which are larger than traditional paper and cellophane. Most plastic films are more difficult to attach. Previously, the concave ink used in the hard-to-adhere film was generally made of a chlorinated dehydrate. In the ink production process, the chlorinated polymer needs to be dissolved using a strong solvent (such as toluene and other aromatic solvents). And in the printing process requires the use of toluene to adjust the accuracy of the ink. The chlorinated polymer ink system is now considered unsuitable for environmental protection because of the destruction of the ozone layer by the chlorofluorocarbons that it volatilizes during production. The use of aromatic solvents (toluene) can cause injury to the health and safety of workers during ink production and printing. In addition to this meal, solvent residues in packaging inks are another concern. Since toluene is a slow-drying solvent, it easily remains in the dried ink film layer, corrupting the food in the package and causing harmful odors.