Printing is the application of ink or varnish on to a substrate through the application of pressure from a printing plate. Ink jet is a modern process where the substrate is sprayed. There are different printing processes used and all differ in quality, production rate and cost.
offset lithography - available in sheet-fed or continuous web fed
engraving - fine stationery
thermography - raised printing, used in stationery
reprographics - copying and duplicating
digital printing - limited now, but the technology is exploding
letterpress - the original Guttenburg process (not very common)
screen - used for T-shirts and billboards
flexography - usually used on packaging, such as labels
gravure - used for large runs of magazines and direct-mail catalogues
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