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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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