Flatbed digital printers usually use UV curable inks made of acrylic monomers that are then exposed to strong UV-light to cure, or polymerize them. This process allows for printing on a wide variety of surfaces such as wood or canvas, carpet, tile, and even glass.

Advantages of UV LED curing systems.

Mercury lamps emit only 20 percent of energy as UV light. Some of the remaining energy is emitted as infrared light. This can cause surface areas to be cured that were not intended to be cured and over-curing of some surfaces.
An LED-based system can offer superior control and stability of output