What ink is usually printed on the packing bag?
Ultraviolet (UV) curing inkThe curing process of the UV curing ink is a process of photochemical reaction, namely in the ultraviolet energy under the effect of prepolymer in a very short period of time the film curing, UV curing inks which in addition to the surface, UV curable ink can penetrate deep into the liquid, and further stimulate the deep curing ink film. In traditional ink, the ink based on oil is solidified under the action of oxidation, and the ink based on solvent or water is solidified mainly by evaporation of water or solvent. Some ink can permeate the paper. Therefore, compared with the traditional ink, UV curing ink polymerization drying more thoroughly, there is no evaporation or solvent pollutants, ink film 100% curing. UV curable ink is mainly used for flexible printing of soft base material. It consists of prepolymer, reaction diluent, pigment, additive, photoinitiator / composition. The reactive diluent selection has an effect on the migratory responses of the ink formula; performance additives on ink (ink printability, migration, substrate wetting, friction coefficient, wear resistance, pigment dispersion and stability) and printing smell adjustment; pigment on the UV absorption spectrum requirements as may be small, the ideal pigment should have good dispersibility, good leveling, strong coloring, in light under the irradiation of ultraviolet absorption of small, for the characteristics of polymerization without impairing the. The use of UV curable ink printing should be paid attention to when the polymerization inhibition effect, surface tension and wetting effect, ink viscosity and humidity correlation, the printed version of the expansion; due to adhesion of the ink for plastic is not good, so it is necessary to the production of the plastic flame treatment or corona discharge treatment, in order to improve the adhesion of plastic surface.
Water-based inkWater-based ink (Water-based ink), referred to as Chinese ink, flexo water-based ink or liquid ink is mainly composed of a water soluble resin, organic pigment, solvent and additives by composite grinding and into. Water based ink is the ink used in most flexo printing and printing at home and abroad. Water soluble resin binders is water-based ink, often used in domestic water soluble modified acrylic resin as binder, heat resistance, weather resistance, chemical resistance, pollution resistance and gloss has significant advantages, whether direct dissolution or synthetic polymer emulsion, all show good performance, water-based ink does not contain volatile organic solvents, not only can reduce the toxicity of the remainder of the printing, but also to prevent the fire from contact with flammable solvents and electrostatic.Water based ink is not only a new type of "green" printing ink, but also the best product to replace the benzene soluble ink. Water based ink is especially suitable for packing and printing products in strict hygienic condition such as tobacco, wine, food, beverage, medicine, children's toy and so on.
