UV varnish

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  • A UV Varnish is a liquid coating that is applied to the surface of a sheet (available in Gloss, Matt and Silk finishes) which is then dried / cured under an ultra violet light. Varnishing is one of the best methods available to greatly enhance the appearance of a printed sheet and after applying a UV varnish you can instantly see the difference.
  • The vibrancy of any underlying colour will have dramatically increased, creating a great first impression and make your print or product more likely to be retained. It can also help protect the underlying print, acting as a physical barrier preventing additional set off and marking.
  • UV Varnishing is so popular in todays print market that you can see its use and the value that is brings in every aspect of the industry. So whether its an overall coating or a spot effect that you are looking for make sure that you incorporate it into your print and get the most from this visually stunning technology.
  • Due to the normally high solids content of UV coating/varnish the surface of the cured film can be extremely reflective and glossy. 80 text and heavier weights of paper can be UV coated, however, cover weights are preferred. UV can be used on smooth, uncoated papers. Special varnishes dry almost straight away if they are exposed to ultra violet light. (UV light).
  • The varnish is sprayed on to the paper / card in the same way as other varnishes. However, after spraying the card passes underneath UV lights which dries the varnish almost instantaneously. One disadvantage is that this type of machinery is expensive to purchase. However, it produces an excellent gloss finish to the card / paper.
  • Varnish is applied to card packaging in order to give it a gloss finish. It offers little protecting to the package and usually applied to give a ‘shine’ to the card. The UV cationic varnishes used for the external protection of the container are applied under the same conditions as the solvent-borne conventional varnishes, without any problem of transfer of odours and/or flavours for "reverse side contact" - i.e. transfer onto the internal side of the sheets during their stacking (tests carried out on the sheets from industrial production have confirmed the same performance as solvent-borne conventional varnishes).
  • The substrate has a very delicate role for this kind of UV varnish application; the substrate can be either the blank metal-sheet or the metal-sheets coated with a solvent-borne basecoat and/or size used as a prime coat. The interfilm adhesion between inks, prime coats and substrate is of great importance in the use of UV
  • The varnishing system (on regular or “scrolled” sheets), requires the application of UV varnish directly onto the metal, followed by the application, on the other side of the sheets, of a solvent-borne internal lacquer, normally dried for 12 minutes at a temperature of 190°C-200°C.

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