Application status of the hottest water-based ink

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The use status of water-based inks

because water-based inks do not contain volatile organic solvents, they have no adverse effects on the health of operators and no pollution to the atmospheric environment during the printing process, which not only reduces the residual toxicity on the surface of printed matter, but also eliminates the hidden dangers of flammability and explosion in the printing workshop, which is conducive to safe production. Therefore, water-based ink is known as a new type of green printing material, which is widely used in cigarette, wine, food, beverage, medicine, children's toys and other printing and packaging materials with strict sanitary conditions. At present, the quality of water-based inks, especially flexo inks, has been greatly improved. The varieties of ink are also increasing, such as plastic ink, fluorescent ink, transparent ink, heat-resistant ink, and bright water equipment. Six sets of fixtures can completely stop seven different experimental inks, water-based gold and silver ink, and water-based Polish ink have been applied

the main application fields of water-based printing inks are flexible printing and gravure printing. According to information, 95% of narrow flexographic paper prints in the United States are printed with water-based ink, and 80% of gravure paper prints are printed with water-based ink. In recent years, China has also developed rapidly, but there is still a large gap between the application amount and that of foreign countries

whether the application of water-based ink is appropriate is an important factor that affects its printing and changes the quality of speed brush. The control indicators of water-based ink include fineness, viscosity, drying speed and pH value

in flexographic printing, the transmission of water-based ink and the control of ink volume are undertaken by the wrinkle roller, so the fineness of the wrinkle roller must be selected according to the situation of the product. For field printing, the wrinkle roller of about 300 lines is generally selected, and the ink layer is relatively thick, while for printing 150 lines of fine-grained version, the wrinkle roller of 600 lines needs to be selected, and the number of lines of the wrinkle roller is generally four times the number of lines of the printed matter, so as to obtain better printing clarity and resolution

to sum up, the main application fields of water-based inks are flexographic printing, gravure printing and silk printing, and the products of these three printing methods, including food packaging, tobacco and alcohol packaging, children's toys and so on, account for a considerable proportion. With the improvement of people's awareness of environmental protection, the urgent need for green printing materials is growing. Therefore, in recent years, water-based ink has developed rapidly all over the world, especially in improving the environment. It is considered to be the most promising printing method. Taking western developed countries as an example, 95% of flexographic printing materials use ink, 80% of gravure printing materials use ink, and 40% of plastic film printing materials use ink

in recent years, China has made remarkable achievements in the development of water-based inks. High quality inks with the characteristics of non-toxic, non irritating odor, non corrosive, non combustible, non explosive, good use safety, high concentration, stable performance, good printability, high adhesion fastness, fast drying, water resistance, alkali resistance, ethanol resistance and excellent wear resistance are emerging in endlessly. It is widely used in the printing of gold card paper, silver card paper, coated paper, whiteboard, corrugated paper, self-adhesive paper, cartons, paper packaging bags, books and magazines, etc. From the adoption of flexo printing and gravure printing methods, the improvement of production technology to the guarantee of environmental protection, water-based inks have been developed more rapidly

when environmental protection requires printers to implement strict environmental goals, there is a chain reaction in all links of raw material supply in the whole printing industry. In order to eliminate VOCs released by solvent-based systems, that is, to meet the requirements of EPA (the u.s.environmentalprotectibn agency) to reduce or eliminate VOCs, printers began to seek new technologies. For ink formulation designers, one possibility is to develop a water-based system that can reduce VOCs. The close integration of the plan will only further improve the user experience. Now ink painting has been improved, which has had a significant impact on many areas of the printing industry. It is a research and development entity that specially strengthens the technical support and guarantee for major national strategic tasks and key projects, especially for flexographic printing. Predictably, ink painting will continue to grow. The future development of ink painting depends on the guidance of EPA; It depends on whether the printer's existing incineration, absorption and treatment control equipment turns to water-based printing after depreciation; It depends on the ink manufacturers to further improve the ink performance in order to win more market share

reprinted from: Zhonghua printing and packaging

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