The main components of the UV ink include pigments, oligomers, monomers (reactive diluents), photoinitiators, and various auxiliaries. Among them, the resin and the reactive diluent act to fix the pigment and provide film-forming properties; the pigment imparts a moderate color to the ink and the hiding power to the substrate; and the photoinitiator requires absorption of the photon-initiated polymerization under the interference of the pigment.
UV printing application market from the printing process, UV ink fixing speed, good conjunctival performance, good adhesion to all kinds of printing materials, and scratch resistance, wear resistance, acid and alkali resistance are more common The ink is good, so although its price is much more expensive than ordinary ink, it is still widely used.
The current fields of printing with UV inks are as follows:
1. Non-absorbent materials such as polyethylene (PE) film, polyvinyl chloride (PVC) film, polypropylene (PP) film, metal foil and non-absorbent special materials. If these printing materials are printed by ordinary solvent-based inks, a certain drying time is required, and it is usually necessary to use a dusting, a drying device or other additives in the ink, and the UV ink has no such trouble.
2. When the metal material is printed on the surface of the metal material with UV ink, the curing process can be shortened and the original curing device can be simplified. At the same time, the good curability and conjunctival properties of the UV ink surface not only improve the post-press processing characteristics, but also improve the appearance quality of the product.
3. Commercial paper printing Commercial paper printing uses special printing materials and inks, such as carbonless copy paper, thermal paper, magnetic ink, anti-counterfeiting ink, etc., and requires ink to have certain resistance to discoloration, heat resistance and stability. It is therefore preferred to use UV ink or UV varnish. At the same time, due to the high speed of the printing equipment and the low ink consumption, it also has the favorable conditions for printing with UV ink.
Process adaptability of UV printing
UV offset printing
Offset printing can be divided into sheet-fed offset printing and web-wound offset printing according to the state of the substrate. Sheet-fed offset printing is suitable for printing on paper, cardboard, plastic sheet and metal foil. Rotary offset printing is fast, suitable for large-volume books and newspapers. , business forms and self-adhesive printing. UV ink is used in offset printing, mainly considering the following aspects: ink curing of non-absorbent printing materials; ink emulsification may hinder the adhesion of ink and substrate; rotary printing machine is fast, requiring ink curing speed and printing speed Matching, especially for self-adhesive printing and security printing with special inks, UV ink printing is better than resin-based offset inks.
Offset printing is mostly used for fine product printing. UV curing can reduce the loss of fine dots and improve the ink transfer rate of overprinting. When selecting ink materials, the effects of each component on UV inks should be considered to ensure the best printing results. Since the offset ink film is generally 2 to 3 μm, although it is advantageous for photocuring, the ink film is thin, and the hiding power of the pigment on the printing surface is affected to some extent, so generally the pigment content in the formulation is increased; and the pigment content is increased, and the ink film is increased. The light transmission performance is lowered, which is not conducive to UV curing; and the ink film itself is thin. If the wettability of the pigment is not good, the pigment and the filler are easily exposed to the surface of the ink film, which affects the gloss of the ink film, so the dispersion is selected. Good pigments.
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