The principle of UV wrinkle ink

UV wrinkle ink is a special imitation metal ink developed in recent years. The screen printing process is used to print the ink on the surface of the substrate. After being cured under special conditions, the printed product can produce a three-dimensional, uniform skin-like visual effect, which is widely used in cigarette packs, wine bags, etc. High-grade packaging of exquisite items.
I. Composition
The UV wrinkle ink consists mainly of a photopolymerizable prepolymer, a photosensitive monomer, a photoinitiator, and an additive (excluding a pigment). Among them, the photoinitiator is the most important component of the entire ink and plays a decisive role in whether wrinkles can be produced. 
Second, solid principle
UV wrinkle ink out of the pattern and curing principle is divided into two parts: that is, through the combination of low-pressure ultraviolet light (sterilizer lamp) and medium-pressure mercury lamp, to produce the visual effect of the print on the surface of the print. 
The main wavelength emitted by the germicidal lamp is 185nM and 253.7nM. The short-wavelength germicidal lamp like this can only cure the surface, while the medium-pressure mercury lamp completes the overall curing. By changing these two curing steps, different surface effects (ie, wrinkle effects) can be produced.
Third, the choice of light source
1. Selection of UV low-pressure ultraviolet lamp
The UV low-pressure ultraviolet lamp should be a 40w/cM or less germicidal lamp, with 3 groups as a group.
2. UV curing lamp (medium pressure mercury lamp)
Curing light power to meet the requirements: power of 80w/cM, 2 for a group. The maximum life is no more than 1200h, it is recommended to replace it once in 1000h.
Fourth, the use of methods 1, the choice of screen UV wrinkle ink in the printing screen mesh number should be selected according to the customer's print pattern of the size of the line, the lower the mesh, the more rough lines. Usually 150 to 200 mesh.
2, the use of ink UV wrinkle ink in the use of screen pressure, printing pressure, scraping gum hardness, scraping rubber angle and low pressure ultraviolet light and curing distance and other factors will affect the printing quality. Effective technical control will improve the printing effect.
3, matters needing attention 1 different substrates, the effect of printing may be different, need to be confirmed before the experiment;
2 Do not arbitrarily change the printing conditions;
3 The ink may change due to light or temperature, so direct light should be avoided.