Water-based UV screen printing ink features and methods of use

UV ink is a kind of chemical reaction type ink. It is a specific application of UV light curing technology in the ink field. It consists of resin with unsaturated functional groups, reactive diluents and initiators, and pigments and auxiliaries/printed on the substrate. When exposed to ultraviolet light, the initiators cleave to produce living radicals or cations, which cause the polymerization of unsaturated functional groups to complete the drying process. During this process, no organic substances are volatilized.
UV ink does not contain organic solvents, and its TVOC value is very low. It will not cause pollution to the atmosphere during production and use; because no heating device is required, energy conservation is significant. A hot air drying tunnel generally 10 ~ 20m long, power consumption 80KW, low thermal efficiency; and UV dryers are generally 3m long, power 20 ~ 30KW, under normal conditions leaving the dryer can print the next process or stacking packaging It's the goal that all printers dream of.

UV inks are very stable in use, in particular, they can overcome problems such as dot enlargement, pattern distortion, crusting, jamming, and inconsistent print colors of solvent inks that often appear in the printing process.

Based on the UV ink technology, the UV water-based ink combines the characteristics of the water-based ink, making the product more excellent in printability, dimensional stability, screen cleaning than 100% UV ink, especially suitable for large format screen printing. application. During the ink drying process, heat of polymerization is released, and heat dissipation is important for the dimensional stability of the substrate. For screen printing, the ink coating layer is relatively thick, generally 6 ~ 10μ, heat dissipation is slow, the accumulated heat easily make the ink site temperature is too high, causing deformation of the substrate, overprinting is not allowed, even more prominent in large-format printing . The introduction of water absorbs a large amount of heat energy and transfers heat as the convective air volatilizes, reducing the possibility of deformation. Although it is an aqueous ink, the dried ink has good water resistance because it forms a network cross-linked structure during polymerization drying to become hydrophobic.

IH series water-based UV inks are specially designed for outdoor advertising printing. The pigments used are selected from the best products of international famous brands and have excellent outdoor light performance. It is used for light box advertisements with bright colors, sharp spots, and clear images. Unlike the use of ordinary ink must be "first four after three," save time and materials, greatly reducing the cost of printing. In the multi-color dot printing business, if solvent inks are used to overprint the second, third, and fourth colors, the dissolution of the solvent before volatilization and the dispersion and thinning of the former color ink film cause dot gain and pattern distortion. The use of UV water-based inks does not present the above problems. Because the moisture content is small, the ink layer has less weight loss after curing, and the utilization rate is high. The solvent ink has a printing area of ​​35-40 m 2 per kilogram, and the water-based UV ink can print 70-80 m 2 . Regarding the stability of the ink on the screen, the performance of the water-based UV ink is even better. Without UV irradiation, it will not be solidified. There will be no persistent problems in the printing industry such as the crust of the solvent ink, blocking mesh, and frozen plates. Good color consistency and high yield.

Water-based UV screen printing ink features

·Without the addition of organic solvents, minimal VOC emissions, no odors, and no flammable or explosive hazards, the environmental and sanitation conditions of ink production and printing production sites have been fundamentally improved. Can meet the most stringent requirements of the environmental protection management department for the industry.

· There is no organic/agent residue in the ink layer of the printed matter; there is no or extremely low amount of detected heavy metals, which can meet stringent food, drug packaging and use requirements on children's toys.

· It has good storage stability, and it can be restored to normal temperature after storage for 48 hours at low temperature -20°C and high temperature 60°C. The maximum change of ink fluidity is no more than 15%. The ink printability and curing drying speed do not change.

· It has excellent stability in use, that is, the use of high-mesh net cloth is also not frozen, does not block the network, the print color is the same, and the yield is high.

· High solid content, less ink layer thinning, no dispersion before curing, clear pattern after printing, strong dot network performance, bright color, no need to print back three colors.

·Using UV light source for drying process, high energy utilization, fast drying, saving time, occupying less space, high production efficiency, and suitable for fast-paced orders.

Strong adhesion, suitable for a variety of synthetic paper, light box cloth, KT board substrate.

· Resistant to sunlight, abrasion resistance, water resistance, suitable for printing printed materials used in outdoor places. Many kinds of advertising prints produced by printers have been published in Beijing, Shanghai, Guangzhou and other cities.

· Screen cleaning using ordinary detergents and tap water, no organic solvents, cost savings, safe operation and no harm.