Where is the most popular environmentally friendly

Where environmental friendly ink is suitable for food plastic packaging printing

release date: Source: Luo Lei decoration editor: Chinese packaging Views: 816 copyright and disclaimer

core tip: with the improvement of living standards, people have put forward higher requirements for food packaging. As a printing material, ink must abide by the principle of no transfer when it is used in food packaging. Do not use conventional ink for food packaging. 20. Test bench return: manually return to the initial position of the experiment at the highest speed. The printing manufacturer must ensure that the hydraulic loading in the printing ink, the oil cylinder lower host structure, the load sensor force measurement, and the computer control experiment process are all volatile. The ink is required to be cured thoroughly and meet the corresponding standards of the application industry

[China Packaging News] with the improvement of living standards, people put forward higher requirements for food packaging. As a printing material, ink must abide by the principle of no transfer when it is used in food packaging. Conventional ink shall not be used for food packaging. The printing manufacturer must ensure that all the solvents in the ink evaporate after printing, and the ink is required to be cured thoroughly and meet the corresponding standards of the application industry

in the current food plastic packaging printing, benzene soluble chlorinated polypropylene ink is the most widely used. The manufacturing and use technology of this kind of ink has been mature, and it is mainly used in the internal printing of BOPP (biaxially oriented polypropylene) materials, and gravure printing is adopted. Although this kind of ink has excellent printability, good post press processing performance and fast drying, it still has many defects

(1) toluene is relatively toxic, and the residual solvent value of printed matter is high

(2) chlorinated polypropylene has poor thermal stability. In the process of production and storage, it is easy to release chlorine and form hydrogen chloride, which makes the ink more acidic and causes heavy corrosion to the production of printing plate rollers

(3) benzene soluble inks can destroy the ozone layer and cause harm to the health and safety of workers in the process of use, and the residues left in packaged products will cause a certain degree of pollution to the food in the package under certain conditions. This kind of ink is tending to be eliminated. In Europe and some developed countries, regulations have been formulated to prohibit or control the use of this kind of ink

it is precisely because of the problems of benzene soluble inks that environmental friendly inks came into being. Using environment-friendly ink, it will not pollute the environment, do no harm to operators, and will not damage the food inside

environmental friendly inks that have been launched include:

1 Water based ink

water based ink is the ink used by most flexographic packaging and printing at home and abroad. It is mainly made of water-soluble resin, organic pigments, solvents and related additives through compound grinding. Water soluble resin is the binder of water-based ink. Water soluble acrylic modified resin is often used as the binder in China. Its heat resistance, weather resistance, chemical resistance, pollution resistance and gloss have significant advantages. Whether it is directly dispersed and dissolved or synthesized into polymer lotion, it shows excellent performance. Therefore, water-based oil ink does not contain volatile organic solvents, which can not only reduce the toxicity of printing residue, And it can prevent fire caused by static electricity in contact with flammable solvents. Water based ink is not only a new type of green printing ink, but also the best product to replace benzene soluble ink

2. Ultraviolet (UV) curing ink

UV curing ink refers to an ink that is cured by the crosslinking reaction of the binder in the ink under the irradiation of a certain wavelength of UV light, which changes from liquid to solid. Before the binder dissolves, the macromolecular prepolymer forms an ink film firmly. UV curing ink is mainly used for flexible printing of soft substrate. It is composed of prepolymer, reaction diluent, pigment, additive, photoinitiator/composite. Among them, the choice of reactive diluent has an impact on the migration reaction in the ink formula; Additives adjust the performance of the ink (printability, ink migration, substrate wetting, friction coefficient, wear resistance, pigment dispersion and stability) and the smell of the print; It is required that the spectral range of UV absorption of pigments should be as small as possible. Ideal pigments should have the characteristics of good dispersion, good leveling, strong coloring power, small UV absorption under light irradiation, and no harm to polymerization reaction. When using UV curing ink for printing, attention should be paid to the inhibition of polymerization. Large capacity lithium-ion batteries have been tried in electric vehicles, surface tension and wetting, the correlation between ink viscosity and humidity, and the expansion of printing plates; Due to the poor adhesion of the ink to the plastic, it is necessary to do flame treatment or corona discharge treatment on the printed plastic to improve the adhesion of the plastic surface

3. Electron beam curing ink (EB ink)

electron beam curing ink is an ink that can quickly change from liquid to solid under the irradiation of high-energy electron beam, also known as EB ink. The electron beam has high energy and strong penetration to solid components such as pigments and fillers. There will be no ink absorption hindered by pigments or fillers, and the drying inside the ink film will not be affected