The reverse UV process can form different effects of high gloss and sand on the surface of printed materials. It reduces the surface treatment process and procedures of printed materials, which can be completed once by a printing machine, saving the processing and production time of lamination. Reverse UV varnishing and can achieve the contrast effect of ordinary varnishing can not do, can make the printing effect of the print better, more exquisite, printing quality to a higher level. This article shall describe the content of the reverse UV process for your reference:Get more news about uv reverse varnish,you can vist our website!

1. What is Reverse UV Printing?
Reverse varnishing aka Pro-Cure is relative to traditional partial varnishing. In Europe and the United States, printers not only use the light-curing UV process to print the same quality as the traditional UV ink, and not satisfied with its high gloss mirror effect or transparent effect only, further improving the process and developed the Pro-Cure process to achieve a higher printing contrast effect.

The use of the Pro-Cure UV process can make the same print with both mirror high gloss effect and matte or linen non-high gloss effect, forming a stronger contrast in brightness and making the varnishing achieve better results. At the same time, because the non-glossy parts are printed by offset printing, the overprinting is very accurate, which also ensures the printing accuracy of the graphics on the glossy parts.
2. Reverse UV Printing Work Principle
Using the “mutual exclusion” principle of coating-type UV Varnish and bottom-printing UV varnish (ink fountain-type UV Varnish), the effect of concave-convex texture and different gloss can be realized at one time, that is, coating varnish on the place without primer to achieve Glossy effect, after applying varnish on the place with primer, it can achieve a matte effect. This process can realize the change of light and shade (or wrinkle shrinkage strength) after UV glazing by controlling the amount of UV primer or the size of dots.
3. Material Requirements For Reverse UV Printing
Smoothness – Choosing paper with high surface smoothness, paper quality or surface roughness, and oil absorption, will reduce the gloss of the printed surface so that the varnishing effect is not obvious.
Amount of Spray Powder – Such as for the choice of ordinary ink printing documents, it is recommended that the inline varnishing process does not use spray powder, but also offline coating water-based varnish. Printed material sprayed powder is too much, affecting the formation of varnish mirror and particles without contrast, the effect is not strong.
Ink Drying – Printing must be fully dried under the circumstances of surface treatment, in case of the ink layer is not dry may cause the varnish curing is not complete, with no effect.
Pre-printing Production – Need to select the pattern for processing, the part of the frosting effect out of the selection, fill the solid base color, bright place empty, in the out of the film and publication single out.
4. Reverse UV Printing Process
Conventional printing must be completed before varnishing and make sure the ink has been thoroughly dried or cured.
Then, the non-high gloss part of the design is printed with transparent reverse ink in offset mode in a continuous or offline manner.
then inline, in a full-page manner on the printing surface coated with a UV varnish and cured.
light oil and previously on the reverse ink contact, resulting in a cohesive reaction, in the non-high gloss parts of the formation of the small particle-like ink film, to achieve matte or linen effect. And not on the reverse ink on the high-gloss parts of the formation of mirror high-gloss effect