Special ink of the green development trend of the

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Special inks for the green development trend of plastic flexible packaging

first, develop and apply benzene free solvent inks and water-based inks to achieve benzene free solvent and water-based gravure printing. At present, the inner gravure inks used are generally made of chlorinated polymers. In the process of ink production, chlorinated polymers need to be dissolved in strong solvents (such as aromatic solvents such as toluene), and toluene is needed to adjust the viscosity of ink in the printing process. Now, chlorinated polymer ink system is considered not suitable for environmental protection requirements. This is because the chlorofluorocarbons it volatilizes in production will destroy the ozone layer. In the process of ink production and printing, the use of aromatic solvents (toluene) will harm the health and safety of workers. In addition, solvent residue in packaging inks is another important issue that needs attention. As toluene is a slow drying solvent, it is very easy to remain in the dry ink film, which will corrupt the food in the package and produce harmful odor

the production of plastic gravure printing ink is being restricted by laws and regulations such as fire protection law, labor safety law and health law. Therefore, it will become an inevitable trend to actively develop and apply green gravure printing ink and water-based ink that meet the requirements of environmental protection. Film packaging materials gravure hydration

although water-based gravure ink has attracted much attention as an alternative system of toluene ink, the oil ink in packaging film printing has not yet reached the real practical stage. On the whole, the important reason why water-based gravure inks have not been further popularized is that the printing performance and quality still fail to meet the standards of solvent based gravure inks. This is mainly due to the high surface tension of water, which makes the ink difficult to wet. If we want to obtain the printing speed and printing quality of gravure solvent ink, not only the water-based ink itself needs advanced technology, but also the gravure equipment and printing plate roller need to be improved. So that they can also continue to develop sustainable solutions. For example, changing the groove depth from corrosion or engraving roller to laser plate making roller with groove depth of about micron, Wang Xianhong, a researcher at Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, said in an interview with China Science Daily that the roller also needs more effective and powerful drying equipment and printing roller made of corrosion-resistant materials The normal load is 2n ink pump, scraper and other components. These improvements require considerable investment

II. Development and application of intaglio alcohol soluble composite plastic inks

since water-based intaglio inks cannot fully replace toluene inks, the ink industry has been working hard to develop alcohol soluble inks that can be accepted by the environment. Alcohol soluble inks can effectively solve the health damage caused by toluene inks and the impact of solvent residues on the quality of packaged food. In Europe and the United States, this development has become a trend. In Asia, such as Singapore, South Korea and other countries, toluene inks are being eliminated and will be replaced by alcohol soluble intaglio inks. Alcohol soluble inks are now 4 The ball screw, which drives the motion of the sensor, has been widely used in the domestic gravure printing industry. It can be predicted that alcohol soluble ink will occupy the main share of the ink market for high-end food and drug flexible packaging in China in the near future

gravure alcohol soluble composite plastic ink has the characteristics of low odor and no benzene. The use of this kind of environmental friendly ink will improve the competitiveness of gravure printing in the field of packaging and printing

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