Ad screen printing ink rookie water UV ink is optimistic (a)

The use of solvent-based inks in advertising and other industries has become more common, but solvents in solvent-based inks are volatile and can contaminate the environment; and in the printing process, the viscosity of inks will increase as the volatilization of solvents increases, resulting in netting. The loss of fine points and color distortions also require that manufacturers increase printing accuracy, save costs, and strengthen labor protection and environmental protection. The UV-curable (UV) water-based ink, which is famous for its green and pollution-free, has the advantages of fast drying, small footprint of the drying equipment, low energy consumption, good on-line stability, high efficiency, and no pollution. Therefore, the advertising ink is made of solvent-based ink. The move to UV-curable inks and water-based UV-curable inks will be a trend in the coming years.

However, in the process of shifting from a solvent-based ink to a UV ink, problems often occur. Since the solvent is not volatilized after the UV ink is printed, the ink thickness of the UV ink is twice as thick as the solvent-based ink under the same printing conditions. , For monochrome printing, it will not cause any effect, but it is different for color dot printing, especially when printing the third color or the fourth color, especially the fourth color, the thickness of the ink layer is obviously increased after the ink is overprinted. The surface of the substrate is not flat. Under the pressure of the squeegee, the ink flows toward the periphery of the low point of the dot, resulting in an increase in dots and the problem of hue distortion caused by the dot enlargement. Because there is no good solution, the conversion process of solvent-based inks to UV-curable inks is hindered.

In order to solve the above problems, NAZDAR Company developed, developed and produced an advertising-specific UV ink - water-based HU000 series UV ink, which can solve the ordinary UV ink dots in the process of color overprint, resulting in the color of the image is difficult to restore this A technical problem. The ink is favored by the advertising industry in the U.S. market. Its features and process technology are briefly described below.

The UV-curable (UV) water-based ink, which is famous for its green pollution-free, has the advantages of fast drying, small footprint of the drying equipment, low energy consumption, good on-line stability, high efficiency, and no pollution, and is an advertising ink development trend.

UV curing ink characteristics

1. Because the ink contains a certain amount of moisture and 5% of the environmental protection solvent, the moisture evaporates after curing, and the ink layer is thinned. Therefore, it has the advantages of thin ink layer after the solvent ink is dried, and also has fast drying of the UV ink. Environmental advantages.

2. Suitable for modern printing equipment, such as continuous production of full-automatic roller screen printing machine, because the ink requires low curing energy, can reduce costs and reduce the substrate deformation caused by thermal deformation and inaccurate failure, while the surface after curing the ink is hard , With a high density of dots, bright colors, high definition, no shadow on the perimeter of the network. In particular, four-color printing has a very good sharpness of the outlets, which is more suitable for indoor and outdoor advertisements, such as back-lighting advertisements and front-end advertisements.

3. It is a one-component photo-curable ink that does not contain NVP or heavy metal contamination.

4. The ink has high color density and can be used to change the printing effect.

The new UV ink is a single-component light-curable ink, adding a certain amount of moisture and 5% of environmentally friendly solvents, water evaporation after curing, thinning the ink layer, not only has the advantages of solvent-based ink drying ink thin, but also has a fast drying UV ink, Environmental advantages.

UV curing ink screen printing process

Substrate: Screen printing can be performed on synthetic paper (such as YUP0), PS, hard PVC, polyethylene materials, paper and card paper.

Wire Mesh: 140-150 mesh/cm monofilament wide opening polyester mesh, stretching net tension above 20N/cm.

Screen sensitized materials: solvent-resistant emulsion or thin capillary film.

Scraper: Hardness HS 70～90°.

Auxiliaries: It is best to use the same series of products, such as HU180 thinner, HU193 adjusting paste, HU349 thinner, HU350 spot oil.

Curing: A medium-pressure mercury lamp with a condenser cover, 200W/inch, transmission speed of 20m/min.

Printing skills: HU000 series printing inks have high color density and are most suitable for the printing of backside advertising. When you want to reduce the color density, you can add HU350 spot oil; if you need to adjust the viscosity and leveling, you can add about 8% of HU193 control cream or about 2% of HU180 thinner. However, the ink should be fully stirred before printing.

Color variety

In order to meet the requirements of rich outdoor advertising color, the four-color advertising screen printing ink of HU000 series ink has two kinds of outlet dots (a kind of partial blue, a kind of partial red), two kind of dots (a type of green, a Reddish), as well as dot blue and dot black. Can choose according to the color picture color request, can achieve better visual effect.