Discussion on UV Reverse Light Process

In China, the main substrates for UV printing are non-absorbent materials. In Europe and the United States, printing companies not only use the co-curing process to print the same quality prints as traditional UV inks, but also do not satisfy their high-gloss mirror effects or transparency effects, and further improve this process to achieve more. High printing contrast. To this end, an early version of the so-called "back-lighting process" was developed. At that time, however, some details were not solved, such as adhesion, so they were not really implemented. After several years of improvement, this process has matured. The following section describes the local glazing process using this technique.

Pro-Cure is relative to traditional local glazing. In the past, regardless of the type of glazing (flexographic printing, screen printing, or gravure printing) used for local glazing, the last glazing process must use partial glazing printing in order to achieve high contrast in local graphics. , Polishing and printing accuracy of the key to the glazing process.

The retrograde light process breaks through the above laws and solves the problem of registration. The process flow is as follows.

Before glazing, it is necessary to complete conventional printing and determine that the ink has been completely dried or cured; then, the non-high-light areas on the design draft are printed with transparent reverse ink by offset printing in a wired or offline manner; The printing method applies UV varnish to the printing surface and cures.

At this time, the optical oil forms a small-particle-like ink film by forming a cohesive reaction with the reverse-light-up ink contact region, and forms a mirror surface in the counter-light-up region.

Obviously, with the retro-reflective process, both high-gloss and non-high-gloss effects will be present on the same print. Moreover, because the non-highlighted part is an offset printing, overprinting is accurate, and at the same time, the accuracy of the graphic part of the high light part is also guaranteed.