Reference Book
water fountain is generaly drained. A tube leading from the water fountain is
used for this purpose. For ink clean up a doctor blade is attached against the
ink roller. The wash up solution is applied while the press is running, the ink
dissolves and passes across the doctor blade into a sludge tray.
First remove as much as ink as possible from the ink fountain. Next, remove
the ink fountain and clean it with ink solvent. While the press is turned off,
attach the doctor blade against the ink roller. Then start the press and apply
wash up solution to one side of the distribution rollers until half the sysem
becomes clean and dry. Then apply the solvent to the remaining inked portion.
The solvent will desolve the ink and will be washed into a sludge tray.Quality control in Offset
The running of an offset press involves many adjustments of various
components of the press, especially when setting the press up for the job to be
printed and monitoring it during the print run. Quality control in printing
mainly involves setting the different printing units for ink feed and colour
register. Then the dampening units, paper feed , air blast, suction, air powder
spray device and driers have to be set. Machinery has also to be cleaned and
washed.
A long make ready time and a number of operators and high paper wastage is
required for doing this work in a high speed multi colour press with neumerous
attachments such as folders, dryers and finishing equipments.
Central control consoles, with control for setting the main press function
remotely and remote control measuring systems has made the quality control
and press monitoring simple.
Remote control press console: This is a remote control system attached to
offset machine that helps the operator to set up press functions such as ink
feed, colour register,
dampening unit
setting, blowers and
suction control with
the aid of computers.
A press remote console
has two parts- an
illuminating system
equiped with a special
light source and a unit
with display screen and
input function keys.
In the first unit the
operator can compare