To truly compare the explosion-proof linearity of the two, the formulation of the two must be adjusted so that their hardness or scratch resistance is the same. At this time, it will be found that the explosion-proof linearity of EB Varnish will be better.
· difference of anti-sticking property
In general people's impression, UV oil does not exist in the case of sticking, but in some special cases, such as requiring UV oil has a good explosion-proof linearity, then the UV oil cross-link density will be minimized, so that UV oil Has better softness and won't break when the paper is bent. However, due to the incomplete nature of UV oil curing, there is a risk of UV oil sticking.
In addition, in the screen UV oil, in order to obtain good flexibility and adhesion to the film, it will be filled in the light plastic oil heating plastic resin, such as polyisobutyl acrylate, etc., these resins not only do not participate in curing, but will Blocking the curing of other monomers and resins, these types of UV oils cure less and are more likely to stick.
In the EB Varnish, due to the violent bombardment of the electron beam, the reactive monomers and the resin react sufficiently and the possibility of sticking is small.
· difference in solvent resistance
In some cases, Varnish will have solvent resistance requirements. For example, a skylight with a PVC or PET film on top of a color box will have a small amount of solvent. If the solvent resistance of UV oil is poor, it may cause UV oil. Stick with film. In addition, the film surface coating furniture, there are also requirements for solvent resistance.
Solvent resistance was measured by using MEK (methyl ethyl ketone) as a cotton cloth to make a round trip and scratching the film. Figure 3 below shows the difference in solvent resistance between EB Var and UV Varnish, with a coating thickness of 4 μm.
Under the same thickness condition, the solvent resistance of EB varnish is more than 4 times that of UV varnish. With the thickening of coating, the solvent resistance of EB varnish will be more obvious.
EB Varnish Like UV Oil Needs to Bottom
First of all, we need to understand why UV oils need to be primed. In UV oils, the active monomer has a very small molecular weight (about 300), the oligomers have a very limited molecular weight (about 500-1000), and the solvent type. The difference in molecular weight between the resin in the varnish (20,000) and the resin in the water oil (5000-100,000) is huge. When the UV oil is coated on the cardboard, the monomers and oligomers penetrate into the paper fiber. In the loss of surface glazing. In order to ensure that UV oil does not penetrate into the paper, all stay on the surface of the paper, high-molecular-weight products such as water oil are needed to make the bottom, and in order to ensure good adhesion of the bottom oil and UV oil, the bottom oil also needs special design and matching. .
EB Varnish and UV Varnish are very similar in formula selection, so EB Varnish is also required to be primed, but due to the adequacy of EB Varnish curing, higher molecular weight resins can be used in EB Varnish, not to design The EB Varnish that needs to be primed offers greater possibilities and flexibility.
· Cost difference
It is believed that everyone will ask this question. For UV oils used on packaging materials that are not sensitive to odor requirements, because they do not use expensive UV photoinitiators, such UV oils have comparable prices to EB oils. However, for some of the more demanding UV oils used in packaging such as gift wrap, medicine, tobacco, food, etc., the price of UV varnish will be higher than that of EB varnish, but due to the need for nitrogen or carbon dioxide gas protection during EB varnish construction, The overall cost may be quite the same, as there is no industrial production data and no accurate answer can be given at this time.
The advantages of EB Varnish
Efficient: The curing speed of a single set of curtain EB curing equipment has reached 900 meters per minute (calculated), higher than the UV curing equipment with three UV lamps in series (about 200 meters per minute), but also higher than the current Fastest printing speed (726m/min, calculated value, German Manroland [Product] 75 press, 75,000 Folio), so EB Varnish is currently the fastest drying speed and will not become an upgrade Barriers to printing efficiency; enhance the added value of products: The degree of curing of EB varnish is much higher than that of UV varnish, enabling the product to have better abrasion resistance, rub resistance, solvent resistance, yellowing resistance, and good Odor, these properties are UV oil, water oil and other varnish can not be achieved.
Safety and environmental protection: The printed surface after EB Varnish has no residual small molecule chemical substances. Its safety and environmental protection are also unobtainable by UV oil and can be safely used in food packaging, tobacco and wine packaging. , drug packaging, or packaging that is in contact with the human body.
in conclusion
EB varnish has obvious advantages in performance compared with UV coatings. EB varnish is a better choice when processing high-profile products or certain special requirements products, such as food packaging, alcohol and tobacco packaging, and articles in contact with human body. select.
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