How to choose UV varnish
There are many kinds of UV vanish, in accordance with the requirements for
product quality and the function different, divided into flexible, UV light,
wear-resisting UV vanish, heavy oil with UV vanish, yellowing resistance to UV
vanish, high adhesion UV vanish and low volatile UV vanish. Each has the
applicable products, but also has the certain application limitations.
So, the printing enterprises need to choose UV vanish reasonable. Some
products post-press processing is relatively complex, printing quality after UV
glazing the need for die cutting, creasing, such as multi-channel processes,
the need to select flexibility good UV vanish. But it is important to
note that the more flexibility good UV vanish, the slower the curing rate, the
lower the surface hardness, thus there may be a poor printing after curing,
printing quality surface adhesion, easily scratched risk when pasting box.
In addition, some printing quality after UV glazing to hot stamping, such as
pasting box a fine finishing process, can choose can recoat UV vanish at this
time. Hot stamping effect more good UV vanish, flexibility slow, also
there are printing after curing, printing quality surface adhesion, easily
scratched risk when pasting box.
And wear-resisting UV vanish is used crosslinking density and resin reaction
rate is very high, so has advantages of high surface hardness and good wear
resistance, and this kind of resin has after the curing speed, film forming
shrinkage rate, low surface tension, the characteristics of high surface
hardness. So, wear-resisting performance is good UV light oil, the higher
surface, hardness, but the surface painting and flexibility will be worse,
pasting box when there may be a critical color, the risk of poor adhesion.
The problems to be solved of UV vanish
1. Smells. Although UV vanish is gradually to develop in the
direction of low odor, but the smell problems still exist. We need to
increase the molecular weight of Prepolymer and monomer and reactivity,
development including light initiator, no smell of raw materials.
2. Security. UV vanish in the smell and the food hygiene safety
worse than water-based vanish, and the UV coating did you get the FDA, can’t
direct contact with food.
3. To reduce cost. In recent years, although the cost of UV vanish
had dropped a lot of, but compared with the general ink, or too high, still
need to be further reduced, mainly is the UV glazing, UV curing unit equipment
operation cost, etc.
Overall, although UV vanish has the above problems, but in the protection of
the environment, save energy, simplify operation and enhancing the added value
of the product has a great advantage, believe that with the constant progress
of UV curing technology, UV vanish will have large development space
in [url=http://www.chinaprintingmasters.com/]printing service[/url].
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