Performance Test and Application of YP-U UV Ink PS Plate

UV ink, also known as UV ink. UV inks are pigments that are dispersed in a film formed of a prepolymer, a monomer, a photoinitiator, and the like. During the printing, the ink is formed into a film and dried using ultraviolet irradiation.

Under ultraviolet irradiation, the photopolymerization initiator in the UV ink absorbs photons of a certain wavelength, excites the excited state to form radicals or ions, and then transmits the intermolecular energy to make the polymerizable prepolymer and the photosensitizing complex. Continuous cross-linked polymerization cured film.

UV inks include UV frosting, UV ice, UV embossing, UV foaming, UV light fixing inks, UV refraction, UV gemstones, and UV varnish. On the surface of the substrate with a metallic mirror gloss, UV ink is printed on the surface of the substrate with offset printing, screen printing, flexible printing, etc., and then irradiated with ultraviolet light. The pattern printed by this process has a luxurious and elegant viewing effect. UV inks are mainly used for high-grade, exquisite, chic tobacco, wine, cosmetics, health products, food, medicines and other products of aluminum, iron and other alloys, plastic film, paper and other substrates made of packaging boxes, barrels of printing.

UV inks can be instantly cured, printing, hot stamping, crosscutting, and other postpress processing can be completed online on the same production line, so printing time is short and efficient.

UV inks have good adhesion to a variety of substrates, and can be used to print plastic films and other substrates such as polypropylene, polyethylene, and polystyrene that are difficult to print with conventional inks.

UV inks generally do not contain volatile organic compounds, so their viscosity and color do not change during the printing process, which is conducive to stable control of the printing process.

UV inks have good scratch resistance, chemical resistance, and good fastness and long-term preservation.

UV ink has better printing hiding power and good gloss, and is especially suitable for printing text and images of packaged prints.

UV inks are used in the printing industry for a short period of time, only a history of more than 20 years, and the technology needs further improvement. Some of the raw materials currently used in UV inks have a certain odor and toxicity, and some have a stimulating effect on the skin, so the use of UV ink printing packages can not be used for food packaging. The pigment of UV ink is dispersed into the intermediate of the film forming material. After being printed on the substrate and irradiated with ultraviolet rays, the prepolymer and the monomer are cross-linked into a film-forming resin under the action of a photoinitiator, so the UV ink is stable. The sex is still not good, the storage period is generally only about six months.

The raw materials such as prepolymers in UV inks have a certain corrosive effect on the rollers and blankets used in conventional ink printing. Therefore, UV inks must use special ink rollers and blankets during printing, so ordinary printing presses cannot generally be used. Direct printing with UV inks requires a special printer.

Conventional inks only undergo physical changes throughout the printing process, changing from a liquid phase to a solid phase, ie film formation is the solvent in the ink evaporating during the drying process, leaving the pigment and film-forming resin. The UV ink is irradiated by ultraviolet rays in the printing process, and the prepolymer and the monomer are chemically changed under the action of a photoinitiator to form a film-forming resin. Of course, the pigment is uniformly dispersed into the film-forming resin. However, these chemicals in UV inks are often corrosive to the plate image layer made of ordinary PS plates.

UV printing PS plate, the photosensitive layer must be resistant to corrosion of UV ink chemicals, conventional PS plate coating resin used in the traditional film resin phenolic system can not do, must choose a new type of anti-above A polymer copolymer of chemicals is used as a film-forming resin for UV ink-printed PS plates.

With the promotion of the use of UV inks, the PS version of the special UV ink for UV ink printing is also launched accordingly. Fujifilm's launch of the VPU type UV ink PS version is this type.

In order to meet the needs of domestic users, Dijiao began to develop this new product in 2003. After many times of synthesis, screening and formulation experiments, a film-forming resin suitable for use in a UV ink Ps plate was developed. After several small trials, trial production of UV ink PS plates was carried out at the beginning of this year.

The YP-U type UV ink PS plate produced by test volume production has been tested and improved significantly compared to the traditional YP-II type positive PS plate. The sensitivity is basically the same as that of the Fuji VPU UV ink PS plate. Such indicators have reached the desired purpose.

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