The principle of the use of UV ink in inkjet printers UV ink is an environmentally friendly ink that has developed rapidly in recent years. It quickly captures the market with instant curing (drying), no volatile solvents, and simple and convenient application. UV ink includes UV matte , UV ice, UV foam, UV wrinkle, UV embossing, UV refraction, UV gemstone, UV light fixing ink, UV varnish and other special packaging inks. On the surface of the substrate with metallic mirror gloss, the screen printing process is used to print UV ink on its surface. After being treated with ultraviolet drying equipment, it produces a visual effect that is unique, elegant, solemn and luxurious. The products are mainly used for packaging and printing of high-end and exquisite cigarettes, wine, cosmetics, health care products, food, medicine and so on.
1. UV ink
â’ˆ composition
UV ink is an ink that undergoes cross-linking polymerization reaction under UV light irradiation and instantly cures into a film. It is mainly composed of photopolymerizable prepolymer, photosensitive monomer, photopolymerization initiator, organic pigment and additives. Among them, the photopolymerization initiator is the most important component in the entire UV ink, and is the beginning of the photopolymerization reaction.
â’‰Application characteristics of UV ink:
â‘´ Instant curing, high production efficiency;
⑵ Does not contain volatile solvents; there will be no solvent erosion and damage to the printed matter; it will not pollute the human body and the environment;
(3) The ink will not plug the net, so the finest mesh can be used to print the best quality lines;
â‘·The ink density is stable, and there will be no unevenness due to the difference in density due to the difference of concentration;
⑸ The ink will not dry out, and there is no bad smell of solvent;
⑹The light curing speed is extremely fast, the size of UV equipment is small, and the plant space is occupied;
⑺The heat emitted by the UV lamp will not damage the prints that are afraid of the heat;
â‘»Transparent or translucent ink, hardening speed and good color effect.
â’ŠCure mechanism
UV ink absorbs UV light selectively, and its drying is affected by the total energy of UV light and the distribution of light energy at different wavelengths.
Under the irradiation of UV light, the photopolymerization initiator in the UV ink absorbs photons of a certain wavelength and excites to an excited state, forming free radicals or ions. Then, through the transfer of energy between molecules, polymers such as polymerizable prepolymers and photosensitive monomers are brought into an excited state, and a charge transfer complex is generated. These complexes are continuously cross-linked and polymerized, and cured to form a film.
2. UV light source
â’ˆStructure
The UV light source is a device that emits UV light in a UV curing system. It is usually composed of light box, lamp tube, reflector, power supply, controller and cooling device. According to the different substances filled in the lamp, it can be divided into metal halogen lamps, high-pressure mercury lamps and odorless lamps. Its performance parameters mainly include: arc length, characteristic spectrum, power, working voltage, working current and average life.
â’‰Spectral characteristics
Although the UV light source mainly emits UV light, it is not light of a single wavelength, but light within a wavelength band. Different UV light sources have different bands of emitted light, and the distribution of spectral energy in the band is also different.
The UV light source radiates light in a wavelength band, and the energy distribution of the light of each wavelength is different. Among them, the energy distribution of light with a wavelength of 300 to 310 nm and 360 to 390 nm is better.
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