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Application of UVLED light curing technology in textile printing and dyeing
CLASS: LG UVLED      DATE:2016-3-24    SOURCE:www.longstartech.com.cn

Application of UVLED light curing technology in textile printing and dyeing

Uvled high speed development period is in 80, 7 time, at that time, basically all related to the solidification of the production industry in the search for the possibility of curing with uvled. Also emerged in many industries because of the use of UVLED has been high-speed development, and even developed into a giant industry.

The application of ultraviolet irradiation technology in textile printing and dyeing industry began in the late 1990s. Mainly used in roller surface treatment, surface identification, fiber type modification and curing inks.

Rubber roller is the main drafting components in the spinning process, its performance directly affects the quality of yarn. The outer surface processing generally domestic nitrile rollers two acid treatment. But the cots acid treatment service life is not long, and with the extension of time will make use of the yarn evenness deterioration. Back in the 70s of the 20th century, foreign developed by ultraviolet radiation rubber roller surface treatment technology, many domestic units has also conducted experiments. The results showed that the rollers elasticity increased after UV irradiation, the surface is more smooth, and anti wind flower is improved. Ultraviolet radiation can change the order of the rubber molecules of spatial reticulated structure and molecular, and increase the energy of the molecular chain, thereby increasing the elastic rubber roller; increases photon energy after exercise absorption also rubber molecules, intermolecular distance relationship, molecular particles of small form roller surface smooth to the touch; and rollers in the polar group and electrolyte complexing agent molecules closer, enhance the ability to eliminate foreign electrostatic to cots in spinning anti entangling performance are significantly improved, so as to improve the quality of spinning.

Ultraviolet photons with great energy, when ultraviolet radiation to a lot of material on the molecular excited and emit fluorescence. This phenomenon called for UV fluorescence effect. When the ultraviolet light is irradiated with certain substances, these substances are selectively absorbed and emit different wavelengths and different intensity of visible light. The fluorescence emitted by the material surface can reflect the characteristics of the material, which can be used for the qualitative and quantitative analysis of the substance. When the ultraviolet radiation to the fiber, due to the nature of a variety of fiber photoluminescence is different, the emission of different color fluorescence, so as to identify the type of fiber.

Ultraviolet energy according to the length of the wavelength difference, the size of its energy and most of the organic matter of chemical binding basically belong to the same category, when more energy than the polymer chemical binding energy, molecular chain of ultraviolet irradiation of polymer fiber material produce cracking, under atmospheric conditions in the aerobic and oxygen molecules in the atmosphere become ozone, reactive oxygen species, polymer fiber material is oxidized, the surface generated carboxyl and aldehyde, hydroxyl and carbonyl. After UV treatment after polymer fibers can introduce rich polar groups, such as - Oh, - NH2, etc., so as to improve the hydrophilicity, hygroscopicity and antistatic polymer fiber material; cancellation is employed odor, antibacterial substances, can make polymer fibers with eliminating odor, anti bacteria. The effect of ultraviolet radiation on the fibers only occurs in the range of tens to thousands of depth, so it does not affect the basic physical properties and mechanical properties of the fibers.

At present, the ink used in the ink jet printing technology mainly has the water ink and the solvent type ink. The application and development of water-based and solvent based inks have been basically mature. The shortcomings of the water-based ink is drying time is long, the adaptability to the substrate is small; the solvent based inks, though not a dry, but due to containing volatile organic solvents, easy cause environmental pollution, so its use were restricted. In order to avoid the defects of the ink, UV curing technology is introduced into the ink of the ink jet printing ink. UV curing inks using optically active pre polymers as the base material of ink, under the irradiation of UV light of wavelength of 200 to 450 nm, by light initiator to produce free radicals, binders polymerization and cross-linking reaction caused by, so that the ink from liquid to turn into solid can be cured. The same mechanism can also be used in UV curing adhesives, UV curing coating sheep, wool fabric cured shrinkproof processing technology.

Although the ink curing is a traditional curing technology, but in addition to curing on the paper, people also want to be able to more material in the ink curing effect is better. Now there have been people in stone, wood, cloth on the solidification of the application. The application of Uvled light curing is more and more extensive.