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Rotogravure
is an intaglio process meaning engraved or carved.
The impressions are achieved by the transfer of
ink from cells or depressions of varying depths,
etched into the print cylinder to a web of paper
at high speeds.
The
process of printing involves coating the etched
cylinder into an enclosed fountain or trough of
ink and the etched cells are filled with ink.
While the cells fi ll with ink, the sur-face of
the cylinder (non-image area) also becomes coated
with ink. This non-wanted ink is removed by a
doctor blade or knife which wipes all of the surface
ink from the cylinder. The printing cylinder comes
in contact with the paper and the ink which remains
in the cells is transferred to the paper.
High
cylinder cost generally limits gravure to run
lengths of over 1 million impressions, thus, gravure
is a long run process. Gravure presses are also
much wider than other printing type presses. Unlike
Letterpress or Offset, the ink used is very fluid
and is usu-ally solvent based which in today's
environment is undesirable.
Typical
printed products would include packaging, catalogs,
Sunday newspaper inserts (K-Mart, Parade Magazine,
National Geographic, etc.)
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