Application of the hottest environmental friendly

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In recent years, China's ink industry has developed rapidly, the output has continued to grow rapidly, the application level of new technology and new equipment has been continuously improved, the production technology level and product quality of most enterprises have been greatly improved, and the market of environment-friendly ink products has grown rapidly, which has attracted increasing attention. In particular, packaging ink, as an important growth field of global ink, environmental protection products are cutting and abrasive wear particles. At present, the important development trend of packaging and printing materials is to improve their environmental performance, and choose pollution-free packaging materials that are energy-saving, low consumption, non-toxic, pollution-free, and easy to degrade. Ink is the raw material that causes serious pollution. Therefore, How to reduce the environmental pollution and energy consumption of ink has become the most important development direction of ink industry. In China's flexible packaging printing industry, environmental friendly inks represented by water-based inks, alcohol soluble inks and UV inks are increasingly favored by printing manufacturers

specifically, in the flexographic printing market, ink has been developing rapidly in recent years and has a trend to catch up with the solvent ink system. It has advantages in ease of use and simple printing. Nowadays, when the flexographic printing industry is comparing and choosing ink or solvent ink, the confidence in ink has increased, making more printing work completed by water-based flexographic printing. At present, the performance that ink users require to improve is mainly in the following two aspects:

I Obtain a pH stable ink system. The ink manufacturing industry must develop ink with stable pH value in the printing process, so that there is no need to detect and adjust pH value in the printing process

II Improving re solubility is another important research area. In the process of amine volatilization in ink, the resin tends to solidify, and even solidify on the printing plate. Recently, ink manufacturers have improved the performance of the resin to make it more soluble, which means that the printing system can run longer before cleaning, thereby increasing production. With the joint efforts and cooperation of relevant industries, that is, ink suppliers provide better ink and film suppliers provide easier access. The car will participate in the Bridgestone World Solar Challenge, the world's largest solar car competition, which will be held in Australia on October 8 (1) and 5 Printing machine manufacturers have made better drying devices for water-based systems, which can also accept the instructions of other equipment through RS232 port, so the use of ink will continue to grow and make greater contributions to reducing VOCs emissions

in the silk printing market, UV ink and water-based printing ink jointly occupy a large market. At present, volatile dry inks still occupy the mainstream position in terms of output and varieties of silk printing inks. However, the output of UV ink and water-based ink has increased year by year, and the increase is large. It is only a matter of time before its output exceeds that of volatile dry ink. As the types of oligomer, prepolymer and polymerization initiator in the raw materials of UV ink have increased, the application scope of UV ink is wider, which can be suitable for printing with various substrate materials, and its market share is bound to increase. At present, foreign water-based printing inks have accounted for more than 50% of printing inks. Fully functional water-based ink surface drying for 5S, thermal hardening for 10s; Ultrafine particle water-based ink can be printed with 500 meshes, 8 colors can be printed, and 6000 colors can be prepared by computer; The measurement range of VO burst resistance of water-based ink (cosmetic grade): 250 ~ 5600kpac content is zero, and 50m2 can be printed per kilogram of water-based ink

in terms of composite film flexible packaging, after years of development, the production process of composite film has been relatively perfect, so there will be no major changes in the near future. Because gravure printing has the advantages of exquisite printing quality and high economy in long-term mass printing, it has been widely used in China at present. Due to the inherent characteristics of water-based ink, it can only be used in flexo and relief printing. The high cost of UV ink also limits its application in gravure printing. Therefore, the alcohol soluble ink with low VOC emission is a product that meets the requirements of environmental protection at present and has a broad application prospect. Since the existing production process of composite membrane is more or less accompanied by the production of waste, it is necessary to make some changes in the production process to meet the needs of environmental protection. This is mainly reflected in:

I In the process of plastic gravure printing, benzene free ink (mainly alcohol soluble ink) is used to replace the current ink based on benzene solvent

II In the dry compounding process, the solvent used is ethyl acetate. Although the emission of ethyl acetate gas is not clearly specified in the integrated emission standard of air pollutants (g), the gas is harmful to human respiratory tract and liver, so it should be used as little as possible. An alcohol soluble polyurethane adhesive has been developed, which uses industrial alcohol instead of ethyl acetate as the solvent. The adhesive uses alcohol as the solvent, has no pollution, has good compatibility with alcohol soluble ink, and the cost is not high. It will be widely used

when using alcohol soluble gravure printing ink, the following matters should be paid attention to:

I It should be stored at a low temperature, and the ink should be fully stirred before use to make it have good flow performance

II Alcohol soluble inks should meet the requirements of computer application in terms of viscosity, thinness, dryness, etc. Generally speaking, ethanol can be used as fast drying diluent and butanol as slow drying diluent. When the speed of the printing machine is high or the weather in winter is cold and dry slowly, a quick drying agent can be added to accelerate its dryness

III Alcohol soluble inks can be mixed with each other to adjust various colors, but cannot be mixed with other types of inks, especially with chlorinated polypropylene inks, so as to avoid resin precipitation and other phenomena

source: shenggekang design and printing

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