Research and development of the hottest environmen

Research and development of environmental friendly inks (Part 2)

because UV inks are photochemical cross-linking reactions, they dry faster, consume less energy, and produce products with good gloss and bright colors. Because the ink film is crosslinked by polymer, it has strong oil resistance, wear resistance, water resistance and solvent resistance, and has the advantages of long-term storage and stable performance. There are many kinds of UV inks, not only all kinds of conventional inks, but also UV icing, UV sanding, UV refraction, UV foaming ink, etc

however, UV ink should pay attention to the skin protection of operators in the printing process, otherwise it will be stimulated. In addition, it should also prevent the harm of ultraviolet light to human body, and timely eliminate the ozone generated in the air after exposure to ultraviolet light. More importantly, the UV ink binder is not easy to dissolve after crosslinking, which affects the recycling after waste. At present, the recycling project is also under study

now, water-based UV inks have been developed abroad. Due to the high viscosity of photopolymerization prepolymer in ordinary UV inks, acrylate compounds are generally added as active diluents to dilute UV inks, which are not very safe. Therefore, in order to reduce the viscosity of UV ink, water-based UV ink has been developed. Its solvent is mainly ethanol, which will make the ink have good miscibility and adhesion

according to the latest understanding, the combination of UV ink and oily ink can form a new type of pollution-free ink without VOC

soybean oil-based ink came out

vegetable oil-based (soybean oil) ink is mainly composed of resin, pigment, 8. Experimental speed: 0.001~500mm/min (arbitrarily adjusted) additives and solvents. Among its components, pigment is 0 ~ 30%, resin is 30 ~ 40%, and additives are 0 ~ 5%. The ink binder contains vegetable oil (soybean oil, flaxseed oil) and mineral oil (low VOC). Ordinary ink contains 10% - 20% vegetable oil and 20% - 30% mineral oil (low VOC), while soybean oil-based ink contains mineral oil (low VOC), which is generally 10% - 25%. The mineral oil content of soybean oil-based ink with lower VOC content is only 0% - 5%

Japan has been relatively successful in the research and development of soybean oil ink. Osaka printing ink company has developed 100% soybean oil and VOC free sheet fed offset ink opitone eco soy-100 in recent years, which has passed the certification of the American Soybean Association. The key technology of the ink is to use the synthetic resin of soybean oil and drying catalyst. The ink has good gloss, friction resistance, dryness, fountain stability and other printability, and can be used for coated paper, paperboard, E-type corrugated paper and fine corrugated paper

there are many kinds of waterless offset printing inks

a key in offset printing is to achieve the real ink balance, and waterless offset printing fundamentally solves (4) the relative uncertainty U4 introduced by measurement repeatability; This problem. However, due to the influence of temperature, the viscosity of anhydrous offset printing ink changes greatly. For example, the ink is diluted by extrusion and friction between ink rollers, which makes the printing plate dirty. Therefore, if there is no cooling equipment, waterless offset printing is difficult to achieve. The best way is to study the matching ink to keep the viscosity constant under a wide temperature. At present, there are several new inks that have been introduced

1. The principle of single fluid ink is to install a device with mixing function on the printing machine. When printing, the traditional ink and water are emulsified in the device, and the emulsified emulsion is transferred to the ink roller. When it is transferred to the printing plate, the emulsion is separated into oil and water again. The ink with this structure does not volatilize in the process of use, will not cause air pollution, and also ensures the normal progress of printing

2. Oilless ink water-based ink

this kind of ink is suitable for silicone plates, and the printing is completed by repelling the ink from the non imaging area. It requires the printer to have a temperature control roller to heat the ink to 35 ℃, and evaporate the excess water in the ink by heat; When the ink is transferred to the printing plate, only 1% - 2% of the water in the ink is left, and it can be dried after about 5 minutes. This kind of ink has the same viscosity and viscosity as traditional ink. The printing ink layer is thick and dense, and the quality is very good

innovative electronic ink

electronic ink is a unique liquid ink that realizes color digital offset printing technology. The ink forms charged liquid ink particles in printing, making it possible for the position of ink particles in digital printing to be electronically controlled. This kind of electronic ink particles can reach 1 ~ 2 μ M extremely small particle size, so small ink particles can make printing achieve higher resolution and smoothness, clear image outline, good hierarchical reproducibility, thin and uniform ink layer. In addition to the standard colors of yellow, magenta, cyan and black, electronic ink also adds orange, red and purple, making the reproduction ability of printing color higher than that of the original four-color ink. With the rapid development of color desktop system and digital printing, the application and development of electronic ink will have a broader prospect

to sum up, the research and development of environmental friendly inks are mainly to control the production of VOC in the printing process. The ink components do not contain harmful substances and reduce the energy consumption in the printing process. Here are some flexible packaging structures that have been or are changing, which meet the cleaner production and gb/t 24000 series standards. At present, there are many environmentally friendly inks, most of which are under research and development, but the prospect is promising

information source: Printing Technology