Ultraviolet inks, also called UV inks, use a certain wavelength of ultraviolet radiation to turn a liquid UV ink into a solid ink through an instantaneous photochemical reaction.

UV inks have developed rapidly in the past 10 years, have entered the stage of maturity, and are recognized by the world as pollution-free ink varieties. At the 7th International Conference on Radiation Curing in Malaysia last August, much information showed that the world's main application area for radiation curing (including EB curing and UV curing) is the printing industry. Its main varieties include: UV varnish, UV screen printing ink, UV offset ink, UV flexo ink, UV metal printing ink and UV electronic circuit ink. According to the data, in 1997, the United States consumed 3,000 tons of UV flexo inks, and it is increasing at a rate of 9-12% per year.

In recent years, the development of UV materials for printing in China has also been relatively fast. According to statistics, in 1998, domestic UV printing materials consumption exceeded 20001 (including domestic and imported materials), mainly used for UV coating, printed circuit board inks and UV screen printing inks, in addition, there are some UV offset inks, UV embossing inks, etc., UV flexo inks are rarely used, still in its infancy.

    UV flexo inks have received widespread attention and favor in foreign countries, mainly because they have the following characteristics:

1.UV flexo ink is safe and reliable, solvent-free, non-flammable, non-polluting environment, suitable for food, beverage, tobacco, alcohol, medicine and other packaging conditions with high hygienic conditions. Flexo UV ink has been used in foreign food packaging for many years without any problems.

2. UV flexo ink has good printability, high printing quality, no change in physical properties during printing, non-volatile solvent, stable viscosity, not easy to paste plate, can be printed with higher viscosity, strong ink, high dot resolution, order The reproducibility is good, the ink color is bright and bright, and the adhesion is firm, which is suitable for fine product printing.

3.UV flexo ink can be dried instantaneously, with high production efficiency and wide adaptability. It has good adhesion on different printing carriers such as paper, aluminum foil and plastic. After printing, it can be stacked immediately without blocking. .

4. UV flexo ink has excellent physical and chemical properties. The process of UV curing and drying is a photochemical reaction of UV ink, that is, a process from a linear structure to a network structure, so it has many excellent physical and chemical properties such as water resistance, alcohol resistance, alcohol resistance, abrasion resistance, and aging resistance. Kinds of inks are out of reach.

5. The amount of UV flexo ink is saved. Since there is no solvent volatilization, the active ingredient is high, and it can be converted into an ink film by almost 100%, and the amount thereof is less than half of the ink or solvent ink, and the number of cleaning of the printing plate and the anilox roller can be greatly reduced, so the comprehensive cost is relatively low. Based on the above characteristics, UV flexo inks have obvious advantages and development prospects from the perspective of environmental protection, quality, and technology development.

    There is still a process in the promotion and application of UV flexo printing technology in China. On the one hand, it is a further understanding and understanding of UV flexo printing technology, on the other hand, it needs to be improved and improved in terms of equipment, light source, supporting equipment and process technology. The following comprehensive domestic and international information talks about some issues that should be paid attention to in the application of UV flexo printing technology.
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1. UV light source: UV flexo printing needs to be equipped with an ultraviolet light source for each color group. Different colors of UV flexo inks have different ability to absorb ultraviolet rays. For example, yellow and magenta have low absorption capacity and are easy to cure and dry, while blue and black absorb ultraviolet rays and are not easy to dry. The power of the UV lamp can be distributed according to different colors to ensure proper drying of the UV inks of various colors, and at the same time save energy. Pay attention to the aging of the UV light source, and replace the UV lamp in time to prevent the curing from being incomplete and causing adhesion. The UV lamp has a typical life of 1000 hours, and frequent start-up will significantly shorten the life of the lamp.
2. Anilox roller: When using UV flexo ink, the mesh angle of the anilox roller is preferably 30° or 60°. The following are ceramic anilox rolls of several common specifications.
    200 line 9.5-11.0BCM anilox roll: opaque solid pattern can be printed.

    360 line 4.5-6.5BCM anilox roll: printable on the ground and line pattern.

    550 line 3.OBCM anilox roll: printable continuous tone image products.

    650 line 2.5BCM anilox roll: can print continuous tone image products.

    800 line 2.0BCM anilox roll: prints fine continuous image products.

3, rubber roller: rubber roller must be able to resist UV ink, the commonly used rubber roller is generally made of EPDM rubber (ethylene propylene diene monomer) or silicone rubber.

4. Plate: Although the flexographic printing plate currently used can basically be used for UV flexo printing ink, it is better to use a plate with better anti-UV ink, such as DuPont's UVP-67 open plate. Wait.

5, ink viscosity UV flexo ink use viscosity is slightly larger than water-based ink or solvent.

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