UV offset printing ink is composed of binder, reactive diluent, photoinitiator, pigment and auxiliary agent. Utilizing the radiant energy of ultraviolet ray, the chemical substance of the liquid is cured into an ink film by rapid cross-linking. UV offset inks have the common characteristics of common offset inks such as flowability, dispersibility, anti-emulsification, stickiness, low flying ink, good transferability, and drying and post-printing properties. At the same time, UV offset ink has its own characteristics, mainly in the following aspects:
1. Fast cure. Under the irradiation of ultraviolet light, it can be cured in a few seconds. In the packaging printing, it is often required to print a large area on the spot, and a higher density is required. Therefore, the amount of ink has to be increased, and then the drying problem becomes very important.
2. Good conjunctival property, good adhesion to all kinds of substrate materials, since UV ink does not contain solvent, the thickness of cured ink layer is basically the same as the thickness of printing ink layer, and the unit weight of UV ink is compared with ordinary ink. , Printing area 30% -50%. No penetration when cured, can be printed on non-absorbent printing materials, such as the printing of cards, which is an area where ordinary offset printing ink can not be involved.
3. Because the UV ink does not need to be powdered during printing, the printing environment has been improved, and the troubles caused by powder spraying to the post-press processing are avoided, such as the effect on the coating and coating effects. And can be connected processing.
4.UV ink has bright colors, its scratch resistance, abrasion resistance, acid and alkali resistant properties are better than ordinary ink, and its stability is very strong.
Therefore, although its price is much more expensive than ordinary ink, it is still widely used.