Job No:01077 Title:The fundamentals og Graphic Design
2ND
Proof Page:168
168 The Fundamentals of Graphic Design The production process
Printing methods
Lithography
The inked image from a printing plate is transferred or offset
on to a rubber blanket roller that is then pressed against the
substrate. Lithography uses a smooth printing plate and
functions on the basis that oil and water repel each other.
Web printing
This uses stock that is supplied on large rolls rather than
individual sheets. It allows for higher printing speeds, higher
volumes and lower production costs per unit. Webs can be
used with lithography and relief printing methods, such as
rotogravure and flexography.
Letterpress
A relief printing method whereby an inked, raised surface is
pressed against a substrate. Letterpress was the first
commercial printing method.
Rotogravure
A commercial relief print process in which an image is
engraved into a copper printing plate and pressed directly
against the substrate. Rotogravure is a high-speed printing
process that gives the highest production volume.
Flexography
A method in which the image is carried by surface differences
in the plate. The process creates a rubber relief of the image
that is inked and pressed against the substrate.
Screen printing
A low-volume printing method in which a viscous ink is
passed through a screen – originally made from silk – that
holds a design on to a substrate. Screen-printing allows
images to be applied to a wide range of substrates, including
cloth, ceramics and metals.
Pantone hexachrome
In addition to the CMYK process colours, this system adds
green and orange process colours allowing it to reproduce 90
per cent of the Pantone PMS colours.
Stochastic printing
A method that uses different dot sizes and placements to
avoid the creation of moiré patterns in the four-colour printing
process. Stochastic printing allows a wider gamut of colours
to be produced through the use of additional inks.
Printing
Printing encompasses a range of direct and indirect methods for transferring
an ink on to a substrate, including lithography, screen-printing, intaglio
or gravure.
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