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Learning objectives
Learning objectives
To learn about:
· the different printing methods available
· four colour process printing
· the printing effects that can be applied to printed
products
· quality checks that are performed on printed
products.
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Slide 3

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Printing methods
Graphic products can be printed in a variety of different ways.
The designer has to select the printing process that suits their
product best.
This will depend on the length of the print run, the quality
required, the paper or card needed, and the project's budget.
The designer will choose from the following printing methods:
· letterpress
· lithography
· flexography
· gravure
· screen printing.
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Printing methods
Letterpress
Letterpress is one of the oldest forms of industrial printing.
Letterpress is known as a relief printing method, because the
printing plate is not flat.
A printing plate is prepared with the image to be printed raised
above the surface of the plate, standing proud
of the non-printing area.
The raised surface is coated with ink
and is then pressed onto the paper.
It is an expensive process, as the
plate has to be specially made and
high quality paper is needed. It is used
for high quality books and stationary.
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Slide 5

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Printing methods
Lithography
Lithography is the most
commonly used process in the
printing industry.
The image is transferred onto
the completely flat printing plate
photographically, using UV light.
The plate is washed in a chemical
that makes the image area attractive to the oil-based ink.
The non-image area is dampened with water to repel the ink.
Lithography is used for medium to large print runs because the
set-up costs are high.
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Printing methods
Flexography Flexography is very similar to
letterpress as it uses a relief
plate. As the name suggests, the
relief plate is made from a flexible
material, like rubber.
It is used to print on
unconventional materials, like
polythene for packaging.
Flexography is ideal for these
surfaces, because the ink is mixed
with a solvent that evaporates,
causing the ink to dry quickly.
Flexography is used on carrier bags and some wallpapers.
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