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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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