Three environmentally friendly inks suitable for food plastic packaging printing

With the improvement of living standards, people have put forward higher requirements for food packaging. Ink as a printing material, when it is used in food packaging, must comply with the principle of non-transfer. Food packaging must not use conventional inks. The printing manufacturer must ensure that all the solvent in the ink is volatile after printing. The ink must be completely cured 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 type of ink is mature, and it is mainly used in the inner printing of BOPP (bidirectionally stretched polypropylene) material, and the gravure printing method is adopted. Although this ink has excellent printability, good post-printing processing performance, and fast drying, due to the relatively high toxicity of toluene, the residual solvent value of the printed matter is relatively high; the thermal stability of chlorinated polypropylene is poor, during the production and storage process In the process, chlorine is easily released to form hydrogen chloride, which makes the ink more acidic and causes serious corrosion to the printing plate roller; benzene-soluble ink can destroy the ozone layer and also cause harm to the health and safety of workers during use. And the residues left in the packaged products will cause a certain degree of pollution to the food in the package under certain conditions. This ink is tending to be eliminated, and regulations for banning or controlling the use of this ink have been formulated in Europe and some developed countries.
It is precisely because of the various problems of benzene soluble ink, environmentally friendly ink came into being. The use of environmentally friendly inks not only causes no pollution to the environment, but also does not cause physical harm to the operators, and it will not cause damage to the food inside.
Environmentally friendly inks that are already on the market are:

Water-based ink
Water-based ink is the ink used in 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 linking material of water-based ink. Water-soluble acrylic modified resin is often used as the linking material in China. Its heat resistance, weather resistance, chemical resistance, pollution resistance and glossiness have significant advantages, regardless of direct dispersion. Dissolved or synthetic polymer emulsions all exhibit excellent performance. Water-based inks do not contain volatile organic solvents, which not only reduces the residual toxicity of printed products, but also prevents fire due to static electricity and 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.
Ultraviolet (UV) curing ink
Ultraviolet curing ink refers to the ink that crosslinks in the ink under the irradiation of ultraviolet light of a certain wavelength and changes from liquid to solid to complete the curing of the ink. Before the dissolution of the binding material, the macromolecular prepolymer is firmly Form an ink film. UV-curable ink is mainly used for flexible printing of soft substrates. It consists of prepolymer, reactive diluent, pigment, additives, photoinitiator / composite. Among them, the choice of reactive diluent has an effect on the migration reaction in the ink formulation; the additives have performance on the ink (printability, ink migration, substrate wetting, friction coefficient, wear resistance, pigment dispersion and stability Properties) and the odor of the printed matter; adjust the spectral range of the ultraviolet absorption of the pigment as small as possible. The characteristics of the reaction without hindrance. When printing with UV-curable inks, attention should be paid to the inhibition of polymerization, surface tension and wetting, the correlation between the viscosity of the ink and humidity, and the expansion of the printing plate; due to the poor adhesion of the ink to the plastic, it is necessary to Plastic is treated with flame or corona discharge to improve the adhesion of the plastic surface.
Electron beam curing ink (EB ink)
Electron beam curing ink refers to the 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 energy is high, and it has strong penetrating power to solid components such as pigments and fillers. There will be no situation where the ink is hindered by the pigments or fillers. The drying inside the ink film will not be affected.

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