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SCREEN
Display your
individuality
So many products are totally dependant on brand recognition for their success
– using innovative print techniques can provide the edge over competitors
By Peter Kiddell
T
hank goodness we are all different in glass and an interlayer of polyvinyl butyral for laminated glass in the UK who are happy to
how we look, live, and run our (PVB) The plastic is bonded between two process small batches. An innovative printer
businesses. There are times, of course, panes of glass under heat and pressure. Once can print the plastic interlayer and have it
when replicating a look or product offering can sealed together, the glass sandwich behaves formed into a laminated sheet of glass creating
be appealing and beneficial to our industry, but as a single unit and looks like normal glass. an effective internal or external functional and
the power of product differentiation is also key. Toughened glass can be used to produce decorative feature.
When we speak of display graphics we tend laminated glass. Like the glass in car
to think of paper and board of various types windshields, laminated glass may crack upon Transparent benefits
but tend to forget the increasing use of glass. impact, but the glass fragments tend to adhere Printing onto glass requires specialist
Textured glass, coloured glass and printed to the plastic interlayer rather than falling free machines and in the UK, HG Kippax is a major
glass. For most applications glass must either and potentially causing injury. It is possible to player. Glass is heavy and fragile before post
be toughened or laminated. Both techniques bond a series of layers together to make it treating so in-feed and out-feed are crucial.
present opportunities for screen printing. bullet or even bomb proof. Cockpit windows on Poor quality prints create very expensive
With toughened glass the design is printed aircraft, for example, are constructed of rejects, so machine and stencil quality are also
onto the surface of the glass using ink multilayer laminated glass. important.
containing the pigment, a medium, such as For all but the most specialised applications, On a larger scale the whole glass fascia of a
pine oil, and glass frit, which consists of finely the temperatures used in production are skyscraper can have vibrant ceramic colours
powdered glass. The printed glass then goes nowhere near as high as required for printed on the external surfaces that will last
into the toughening oven where it is raised to toughening. A temperature of just 70°C is the lifetime of the building. Sometimes rather
700°C and the frit melts and bonds the required and pressure can be applied in several than geometric solids and tones, actual images
pigment to the glass. different ways, from a pressurised oil bath to a of people or animals are created by printing
Laminated glass consists of a sandwich of vacuum envelope. There are several producers individual elements of the image on single
7Sefar SWM mesh has been used to create this bird's nest effect
14 SCREEN PROCESS AND DIGITAL IMAGING l November 2009 Visit us at www.spdi-online.com
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