UV coating and radiation curing technology
UV coating difference between the conventional application of coatings mainly lies in: fast dry, environmental protection, energy saving, high quality. Quick dry is ultraviolet photon energy effect on UV coating components and rapid curing results. Ultraviolet (UV) curing is the current of radiation curing an important branch, because ultraviolet ray only represent electromagnetic radiation spectrum in a narrow band (1 ~ 380 between nm). Other l-band low-energy still infrared radiation, microwave, radio waves, and short wave period of high-energy radiation, such as X-ray, g ray, etc. Generalized radiation concept even charged particle radiation and some other radiation, such as electron beam (EB), synchronous radiation and laser radiation, etc. And, as noted, the most has the application value of radiation curing is UV curing
and EB curing, the UV curing
a wider application.
By this token, radiation curing (UV/EB curing) is actually a kind of with the aid of energy radiation source (UV or electron beam) realize chemical formula (paint, printing ink and adhesive) by liquid into solid processing process.
technology field can be traced back to the 1960 s, when Germany launched the first generation of UV coating, in wood coating industry get preliminary application. After radiation curing technology gradually by wood single base material extended to paper, all kinds of plastic, metal, stone, even cement products, textiles, leather and other base material coating application. The appearance of the processed products from the original specular type, development to inferior smooth type, pearl type, hot stamping type, texture type and so on, to meet different needs. Radiation curing
mass into the printing and publishing industry time late, about the 1990 s. At present radiation curing covers almost all the printing process, including dry offset printing, wet flat printing, screen printing, flexo printing, letterpress printing and gravure printing, etc. Printing paper things except outside there is plastic, metal and film, etc. UV/EB ink compared with traditional solvent ink the most outstanding characteristic, also with UV coating, is fast dry, environmental protection, energy saving, high quality.
In the radiation curing, UV curing application field the most widely. And UV coating compared with UV ink and UV adhesive dosage and much more. It is notable that UV curing to paint curing of maximum thickness of 50 um, to varnish for 130 um. Then electron beam (EB) can make up for the deficiency of UV curing and EB curing to paint maximum penetration thickness general can reach 400 um, but to varnish is 500 um. However it should be noticed that the application of EB curing scale, at present only 10% of the UV curing, the main reason is the EB curing equipment one-time investment than UV equipment much higher.