How is UV ink cured during UV printing?

UV printing forms a cured layer by a different mechanism from ordinary printing, and we will talk about how this curing mechanism is achieved:

Ultraviolet region The electromagnetic spectrum is mainly divided into a range from X-rays that penetrate the human body to TV/FM waves. The ultraviolet rays required for UV printing are 100nm to 400nm, and there is a region subdivided into three bands (UV-A, UV-B, UV-C). The wavelength of UV-A is important for curing pigments containing UV pigments, and the UV-C wavelength is required for curing transparent UV varnishes.

Ultraviolet region

The pigments and additives of the coloring materials in the composition of UV ink are mixed in similar proportions, but about 70% of the content of this place is completely different. As a point, it is clear that the ink contains about 30% diesel, which has a VOC problem. UV ink cross-linking. UV ink receives UV light energy, the photoinitiator is excited, and starts a polymerization reaction . The photoinitiator initiates the reaction at different wavelengths, and there are various types of colors and odors.

UV ink cross-linking

The photoinitiator polymerizes by cleaving and connecting with monomers or oligomers in chain form, and this reaction is called "cross-linking" (= cross-linking). The solid film surface formed by UV ink has excellent solvent resistance and also has excellent friction resistance. In industries such as automobiles, aircraft, electrical appliances, and plastic wood, light curing technology is widely used not only in the printing industry but also in paints and adhesives.