As we all know: we can use UV curable ink drying, simply referred to as UV ink. It is a photopolymerizable oligomer and diluent monomer and other components, then adding photoinitiator, and a colorant composition.
The arrival of international market and economic integration, and the left and right will suffer ecological policy. UV inks are also faced with the scientific theory of the fundamental breakthroughs and application of technological innovation - it's no longer just using water-based ink or paper, cartons, packaging, labels, metal foil composite paper, metals, molecules or ions directly by or indirect use of lithographic, flexographic, screen, gravure, transfer printing or computer printing substrate carrier absorption or non-absorption synonymous. With the non-polar non-absorbent plastic material aspirations on the packaging, UV inks can not cope with this and go to expand the market space.
Throughout the UV inks and UV coatings on the market, its drying principle is nothing more than a photochemical reaction, the first condition is a molecule must have sufficient energy photons to become excited after (state) molecule. As is already known each photon can activate a molecule; the same molecule at the same moment can only absorb a photon. Thus, in theory, is often interpreted as: molecule absorbs a photon, it will happen to senior bits of electronic transitions, molecules called electronic transition of the excited state (ie molecules), this excited state molecule in addition to the release of energy but returned after after the ground state, there may transfer energy to generate free radicals or other molecules transfer energy to a photosensitive polymer crosslinking polymerization curing light and light bridge. Whether it is ink containing a photoinitiator system, which aims to make UV ink system photo-curing reaction, which is caused by the results of a photosensitive chemical reaction, or in recent years has been around does not contain the initiator of UV inks and UV coatings, its light-curing after solvent system by cross-linked into a network structure, the result of the photo-polymerization chemical reaction system contains an ultraviolet absorber, absorbing sunlight and fluorescent natural source, ultraviolet light can be converted into a crosslinked hardened ink film structure.
We strictly classified in the same purpose UV ink, after the screening that: as a cold heat source UVLED light sources and light source UV lamp ink drying process, in terms of security, the former than the latter, because when non-UV offset printing ink film when the absorbent material platen after irradiation by ultraviolet or visible light, the molecules of the outer electrons are excited and jump to a higher energy level (position), the absorption of light to appear.
UV region at 200-400 nm in the visible region between 400-800 nm ultraviolet UV lamp or other UV light source is visible only real 4%, 4% is this effect it produced a photochemical reaction. UVLED light just cold light source, or a pure wavelength (single wavelength, such as: 365NM chip, it is only the light emitted 36NM) source. He reinforced the same wavelength of the light intensity can also eliminate the maximum effect of heat (UV light source, more than 80% of the heat is coming from the visible). All these types of UV light on the current terms, UVLED light source is in line with a non-absorbent UV ink PVC electrostatic film using the ideal light source.