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Various
applications for screen printing include:
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pip
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Posters
- Stickers
- Showcards
- Ticketing
- Shelf
strips
- Banners
- Exhibition
panels
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- Exhibition
panels
- Perspex
plaques
- Ring
binders
- Mousemats
- Site
boards
- Signs
- T
Shirts
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A Brief History
SILK SCREEN PRINTING has its origins in japanese stencilling,
but the screen printing process that we know today probably stems from
the patents taken out by Samuel Simon of Manchester at the turn of the
century. He used silk stretched on frames to support hand painted stencils,
a process also used by William Morris. In 1914 John Pilsworth of San
Francisco also took out a patent for multicolour printing, using the
screen process .
During the First World War in America screen printing took off as an
industrial printing process; it was mainly used at first for flags and
banners but also for 'point of sale' advertising in the chain stores
in America, which were appearing around that time.
Around this time the invention of the photographic stencil revolutionised
the process; in the following years, obviously improvements were made
in the presses, inks and chemicals used, but apart from the introduction
of computer technology in the 1980's - in the pre-press side of screenprinting
- very little else has changed since.
Walk down any High street and you will see examples of SCREEN PRINTING
everywhere: in shops you will see displays and posters advertising their
products; you will see buses with ads on their sides; on computers and
hi-fi you will notice badges and control panels; all these have been
screen printed. In the home you will find that many textiles and items
of clothing, sports bags and T shirts have been screenprinted, as well
as the stickers that you have on the rear window of your car.
Artists have also used SILK SCREEN PRINTING, especially since the days
of POP ART in the sixties - Andy Warhol ,Rauschenberg and Hamilton are
a few notorius examples. These artists opened up a whole new vista in
the use of the screen process.
How does screen
printing work?
The equivalent of
the printing plate for the screen printer is the SCREEN - a wooden or
aluminium frame with a fine nylon MESH stretched over it. The MESH is
coated with a light sensitive emulsion or film, which - when dry - will
block the holes in the mesh. The image that needs to be printed is output
to film either by camera or image-setter. This film positive and the
mesh on the screen are sandwiched together and exposed to ultra-violet
light in a device called a print-down frame. The screen is then washed
with a jet of water which washes away all the light sensitive emulsion
that has not been hardened by the ultra-violet light. This leaves you
with an open stencil which corresponds exactly to the image that was
supplied on the film. Now the screen is fitted on the press and is hinged
so it can be raised and lowered. The substrate to be printed is placed
in position under the screen and ink is placed on the top side of the
screen, (the frame acts also as wall to contain the ink ). A rubber
blade gripped in a wooden or metal handle called a SQUEEGEE (not unlike
a giant wind-screen wiper) is pulled across the top of the screen; it
pushes the ink through the mesh onto the surface of the substrate you
are printing. To repeat the process the squeegee floods the screen again
with a return stroke before printing the next impression.
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