The printed intaglio ink used is generally made of a chlorinated polymer. In the ink production process, the chlorinated polymer needs to be dissolved using a strong solvent (such as toluene and other aromatic solvents), and the viscosity of the ink needs to be adjusted during the printing process. Chlorinated polymer ink systems are considered non-environmental products. Because the chlorofluorocarbons that it volatilizes in production can destroy the atmospheric ozone layer; the use of aromatic solvents such as toluene can cause harm to the health and safety of workers during ink production and printing. In addition, the solvent residue in the package is another important issue that needs attention. Since an aromatic solvent such as toluene is a slow-drying solvent, it easily remains in the dried ink layer, contaminates the contents of the package, and generates offensive odors.
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