01.03.2014
SolarColorDust is a UV sensitive or photochromic pigment that changes color from white to its respective color when exposed to bright sunlight or when placed under a UV black light. Offset printing technology is preferred method for printing materials providing lower per-unit costs with the quality for larger print runs. Level of sales in the printing business based on UV technology has increased globally three times compared to the competition from conventional offset. UV technology represents the biggest degree of quality, and when is used in inline, process is efficient, consistent and just as harmless as the conventional offset printing in terms of health if we follow all the instructions and measures of safety. However, it is not possible to overcome UV printing and coating technology in a simply steeps.
UV printers need to collect experience, manage expenses of investment and expenses of materials and energy, they must plan time of amendments and preparation time for machine between operations with conventional and UV colors, as well as to adjust printing parameters.
For creating dry coated film on printed material UV varnish are using UV radiation from which their name is coming. Radical is at the inks and varnishes based on acrylic and these are mainly used UV varnishes.


Drying is carried out in a manner that photo initiators under the influence of UV radiation decompose into chemically highly reactive radicals that initiate networking of monomers in a strong plastic film. For more expensive, cationic substances, which are mainly UV varnishes based on epoxy resin, a one single pulse is enough to trigger the process of drying i.e. Since UV inks and varnishes harden in a split second using UV radiation in the printing press, sheet can be instantly forwarded to next process of post press operations and film thickness shows high resistance to mechanical influences such as the scraping and scratching. But their biggest plus is the possibility of printing on non-porous substrates such as synthetic, plastics or metallic papers. Because UV varnishes does not contain harmful organic solvents they are use more and more especially in the U.S. Besides that printed materials varnished with UV coatings have a much better and smoother fingerprints touch. Huge range of non-absorbent substrates that can be printed with UV inks and varnishes becomes great challenge for creative designers in print of packaging and labels.
Also, because of aggressive photo initiator in these inks must be careful not to come in contact with skin and especially not to put them under the sun because UV radiation stimulates reaction.


If we talk about the disadvantages, then they are essentially costs of investments in this technology that is the high and high costs of materials and energy, because UV lamp consumes large amounts of electricity.
Because they don’t contain liquid substances the whole amount of varnish will polymerized as a hard film on the surface of printed material.
In cases where the UV-varnish is applied over the conventional offset ink on which first is printed primer is required in to examine the need for the use of powder.
This technology offers high gloss of printed materials and increases the range of printing surfaces who can be used and therefore is used particular in order for achieving better design and improving the selling of graphic products. Photo initiators will let start-up reaction of connecting of molecules like in the net under the influence of UV radiation .UV varnishes without the effects of UV radiation remain in fluid and therefore will not get dry on the rollers.



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Comments Uv light for epoxy flooring

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