Graphic Design & Printing Technology

Graphic Design & Printing Technology

Make sure you have properly

installed and gummed the plate

on the press. Place the

dampener form rollers in the off

position. Place the ink form

rollers in the on position and

allow the gummed plate to ink

up over the entire surface. Stop

the press and place the ink roller

in off position. Allow the plate

cylinder to come into contact

with the blanket cylinder. Take

the plate cylinder out of contact.

Do this in several different

locations on the blanket. You

should have a uniform ink-band

line 3.2 mm to 4.8 mm wide. If

an adjustment is required

correct the parallel first and then

the overall press adjustments.

Multi colour printing

Most offset lithographic presses can be used to produce quality process colour
work, if good separations, plates, paper, ink and skilled operators are available.
Multicolour sheetfed presses operate in the same manner as single colour
sheetfed presses. But they are equipped with two or more colour printing
units arranged in-line (one following the other). Each printing unit is capable
of delivering a single colour of ink to the press sheet. Most multicolour presses
are designed with two, four, or six printing units. Two colour presses are ideal
for jobs that require spot colour such as a page of text in which the text is
printed in one colour and the display type or graphic elements (rules, boxes,
decorative borders, or illustrations) are printed in another colour. Four colour
presses are designed especially for four-colour process printing. A five- or
six-colour presses increase printing possibilities even further by allowing a
sheet to be printed with four process colours, followed by a flat or match colour,
or a varnish.