What is UV curing
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
The main difference between UV curing and drying of conventional inks is the composition and drying mechanism of their attachment. The conventional oil-based ink depends on the absorption of the liquid material into the printing material, and the ink solidifies after the liquid penetrates, and the resin material in the ink is dried by oxidative polymerization to produce a scratch-resistant surface. This process can take several hours, depending on the substrate, ink coverage, chemical properties of the ink and water, and ink balance. Auxiliary volatilization (infrared and hot air plus warm air) accelerates the drying rate of the aqueous varnish.
The UV curing process uses an ink containing a photoinitiator that can be excited by ultraviolet light of a specific wavelength width and a specific intensity. After printing, the substrate is exposed to ultraviolet light (from the fixture mounted on the press), causing a chemical reaction of the photoinitiator and other UV reactive components, almost instantaneously curing (drying) the ink varnish layer.
Under the co-catalysis of UV and photoinitiators, the ink linker reacts immediately to form a dry ink film (the UV ink linker includes polymerizable monomers, oligomers, and prepolymers).
Sheetfed UV inks and varnish systems are based on acrylics and are typically used in 4 ways:
• Traditional ink + dispersion primer + UV glazing
• Classic UV ink and UV varnish
• Non-classical UV (mixed) inks and UV varnishes
• Combine UV inks with conventional ink systems and varnish on the same press for rotation.