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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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