The main difference between digital printing and traditional methods such as lithography, flexography, gravure, or letterpress is that no printing plates are used, resulting in a quicker and less expensive turn around time. The most popular methods include inkjet or laser printers that deposit pigment or toner onto a wide variety of substrates including paper, photo paper, canvas, glass, metal, marble and other substances.
Consumer and professional printers such as inkjet or laser printers use the most common examples of digital printing. Professional companies now use those practices to go green by using better quality ink and better laser etching to get a more crisp picture that is displayed through digital printing.
In many of the processes the ink or toner does not permeate the substrate, as does conventional ink, but forms a thin layer on the surface and may in some systems be additionally adhered to the substrate by using a fuser fluid with heat process (toner) or UV curing process (ink). Source : Wikipedia
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