fed presses are used in the printing industry
to print jobs that require lower counts.
For example, if a printer was printing
a job that required 50,000 impressions
they would use a sheetfed press. On the
other hand, if they were printing a wide
distribution magazine, a high speed web
would be used.
was said, years ago, that sheetfed printing
was used for quality printing and web
for volume. Today, that is no longer the
case. Web and sheetfed can both give equal
print performance. It is more now a matter
of your customer base and the length of
1 shows a common six color sheetfed press
with a coater and infrared dryers. Each
unit prints a different color. The usual
sequence for printing is to print black,
cyan, magenta and then yellow. The extra
two units on the press are used to print
special colors. The coater is used to
give gloss or protection to the printed
sheet. Between each print unit is a transfer
cylinder to transfer the printed sheet
from one unit to the other. As indicated
in the picture, the ink is still wet during
this transfer process.
of today's sheetfed presses are configured
so that the sheet can be turned and printed
on the back side. In the above press,
it would be common to have the "turn"
cylinder between the 2nd and 3rd print
units. This is called a "perfector cylinder."
The cylinder can be configured by the
pressmen so that he can print 2 colors
on the top of the sheet and 2 colors on
the bottom or not configure.