The present situation and future development of intaglio printing

Gravure printing has other ways that do not have the technical characteristic, gravure printing ink layer thick, saturated uniform, bright color, wide substrates, especially printed the absorbent plastic film material effect is very good, is the mainstream of flexible packaging printing printing way. According to statistics, tobacco paper concave printing and decoration materials (except the part Decorative paper, wall paper, etc. ) Outside, the plastic flexible packaging industry in our country 90% use the gravure printing. Gravure plastic flexible packaging printing process using a volatile ink, in the process of production will produce VOCs volatile organic chemicals, all kinds of damage to the ecological environment and human body. A flexible packaging, gravure printing industry status quo of the plastic flexible packaging gravure printing, use the remains of volatile solvent ink. The ink is divided into two categories: the first is polyamide or chlorinated polypropylene ink resin system, such as toluene, acetone as solvent, the current has been largely discontinued use; The second type is ester solvent or alcohol soluble plastic film gravure ink, using ester, ether and propyl alcohol volatile organic solvents. In view of the increasingly serious environmental problems, intaglio printing enterprises and equipment suppliers are actively deal with it. At present, for the processing of VOCs, in view of the enterprise to use the type of the printing ink, can choose different ways of governance. 1, the end governance, 1) Mixed solvent for mixed solvent, end governance generally use direct combustion method, catalytic combustion method, regenerative combustion, regenerative catalytic combustion, activated carbon fixed bed, fluidized bed adsorption, adsorption wheel concentration + incineration, biological treatment, low temperature plasma, such as governance, currently in the industry and the application of more mature is the RTO regenerative combustion. In order to reduce the RTO equipment investment, generally will add LEL sensor in the machine, in order to achieve automatic explosion-proof, reduce total more than 60% of the exhaust air, improve the exhaust concentration 150% ~ 220%, save the heating energy consumption by 40% ~ 65%. （ 2) Single species using a single solvent ink solvent, can solve a variety of ingredients in VOCs recycling solvent recovery and difficult problems, the realization of circular economy. But this is not only the choice of ink and manufacturing issues, and a series of problems to be solved, including: how to control the production environment variables, create conditions of using a single solvent ink; How to improve printing speed using a single solvent ink, Solve the printing equipment working speed and accuracy; Fluctuate of AIDS; To solve the problem of the difficulty of complex the printing design; With the process. 2, source control using water-based ink can reduce VOCs emissions from the sources. Plastic composite flexible packaging printing using water-based ink, however, we need to focus on the following questions: whether it is pure water-based ink? If with other alcohols solvent, will also need to deal with waste gas, and the processing of low concentration of exhaust gas will bring a series of energy consumption and efficiency. For equipment, increase the drying ability and antirust requirements. Dry ink drying need to use water in high temperature, lead to more energy consumption, total cost increases. The higher the drying temperature can lead to plastic films are more likely to stretch, for electronic axis gravure equipment principle of work is a new challenge. The south's high humidity weather makes use of the ink. The shape of the ink roller screen hole opening big and bright, normal version of the roll opening small and deep: ink roller version is bigger than ordinary version of the net hole width of roll 10% ~ 15%, and the shallow depth of 40% ~ 50%. Composite strength is related to the flexible packaging from the production, packaging, use to consumers to use the link, the barrier layer function, will affect the strength of composite is ink? For some of the more sensitive to water material, BOPA, for example, how to control the printing process? Plugging and cleaning problem in the process of printing, there is no good solution. Residual moisture, - OH there will lead to adhesive incomplete crosslinking reaction, thus affecting the performance of composite perfect performance. Heat resistant properties of the ink. Ink and water resistance, to solve the problem of the ink to dissolve. According to the characteristics of ink drying industry has been in the enterprise developed dry artifact: 50% of energy than conventional drying methods. Can be 80% humidity of the air dehumidification to less than 20%; Significantly improve the drying speed, reduce the ink drying temperature is 50 ~ 70 ℃; Pure water ink ( Only in the original ink containing 5% ethanol) Printing speed can reach 250 ~ 300 m/min. 3, use energy curing without solvent ink as early as in the last century, foreign companies will adopt the energy curing ink, such as UV ink and EB inks, but based on the high cost has not been large-scale application. In recent years, with the relevant technical breakthrough, the energy curing ink printing costs have fallen sharply, the industry is the popularization and application. In Europe and the United States, because the UV printing ink light initiator migration issues, be banned shall not be used for food packaging and medicine packaging. But the EB ink has wide application. Widely used with the method of EB ink printing with offset printing and flexo. Plastic composite flexible packaging printing using the advantages of offset printing ink EB: offset plate imaging can be in a few minutes and processing, and can be used on printing machine immediately. This reduces the printing prepress preparation time, from customer orders to begin printing only 3 h. All of the same or similar parameters can be stored and out of templates. Ink/water curve can be modified from programming diagram to a single figure in the random selection.
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