ELDAN Recycling A/S Page 49
7.3 Useful information regarding the process
Selection of screen
The selection of screens depends on the size of the fractions required
as output for the concerned machine or the required input for the sub-
sequent machine.
In general the choice of screens will depend on:
1. Start product
By processing of material from car tyres smaller screens should be
used than by processing of material from truck tyres.
In truck tyres the main part of t he steel is concentrated in the bead
wire whereas the main part of the steel in car tyres is concentrated in
the tread.
2. Use of end-product
Ex: An Ø30 mm screen is used for "ch ips", which are used as fuel
for blast furnaces.
An Ø20 mm screen is used for gr anulate which is used as
support for road surfaces.
An Ø15 mm screen is used for granulate which should be
granulated further. With a screen in this size 90-98% of the
steel in the input is liberat ed and the steel can then be re-
moved by means of a magnet.
3. Capacity Kg/H
The larger the screens, the higher the capacity.
4. Purity of the granulate, % textile and wire
The larger the screens, the less st eel will be liberated from the granu-
late and the more rubber will be tied to the steel which is taken out af-
ter the machine.
The smaller the screens, the more st eel is liberated from the granu-
late. This is an advantage if the mach ine is part of a complete plant
because the wear will be concentrated in this machine with regard to
the steel in the input.
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