UV ink introduced
A, UV ink and traditional ink composition comparison
UV ink composition and traditional ink have similar place. The difference is UV ink film is chemical action, from monomer to gather cooperation, and traditional ink film is physical function, resin has been polymer, solvent will solid polymer melt into liquid polymer, to adapt to the printed coated in the printing on things, and then by the solvent evaporation and be absorbed, make the liquid polymer reply again into the original solid shape. Below are two kind of ink composition contrast:
UV ink traditional ink
Second, the basic concept and principle
UV curable ink (UV ink) is the use of UV (ultraviolet) light sensitive action to make the ink film and drying. UV ink dry and film forming mechanism, it is a kind of chemical change. Use different ultraviolet spectrum (ultraviolet
Spectrum), produce different energy and different prepolymer (oligomer) and different monomer (monomer) polymerization into polymer (polymer). So UV ink color film has good mechanical and chemical.
UV ink varieties are UV grinding, UV ice, UV foaming, UV wrinkle, UV convex word, UV refraction, UV gem, UV light solid color, UV glazing oil special packaging printing ink. In a metal mirror glossy printing surfaces, using screen printing process means will UV ink printed on it, and the UV drying equipment light after processing, produce a kind of unique visual effect, appear elegant, grave, showily, mainly used in high-grade, elegant chic cigarettes, liquor, cosmetics, health products, food, medicine, packaging and printing.
UV ink to UV light is selective absorption, its drying by UV light source radiation light total energy and different wavelength light energy distribution influence, in the UV light irradiation, the UV printing ink light polymerization initiator absorb certain wavelengths of photons, excitation to excitation state, forming a free radicals or ion. Then through the intermolecular energy transfer, make polymerized prepolymer and light-sensitive monomer and polymer become excited state, produce the charge transfer complex body. These complex body constantly crosslinking polymerization, curing film.
UV light source is UV curing
system of UV light emission of the device. Usually by light box, fluorescent tubes, mirror, power supply, controller and cooling device etc constitute. According to the tube filling material is different, can be divided into metal halide lamp, high pressure mercury lamp and odourless lamp and so on species. Its performance parameters mainly include: arc annual, characteristic spectrum, power, working voltage, current and average life expectancy, etc.
UV light source although launch major UV light, but it is not a single wavelength of light, but a band of light within. Different UV light source emission light band range, band inside spectrum energy distribution is also different. UV light source radiation is a band in the light, and each wavelength of light energy distribution is not the same. The wavelength for 300 ~ < / p > < p >
310 nm, 360 ~ 390 nm of light energy distribution is better. UV light wavelength range is very wide, wavelength in the UV - A region when about 360 nm best effect.