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ÀÚ·á´Â frenzelit expansion joint Ä«´Ù·Î±×¸¦ ¹ø¿ªÇÑ °ÍÀ̸ç Design examplesÀº Ä«´Ù·Î¸¦ ÂüÁ¶ÇϽʽÿÀ.
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Material characteristics |
The
purposeful combination of different material properties provides for and optimum
solution both technically and economically. High-grade and expensive special
materials are used only where it is a matter of enhanced safety or where loads
are extremely high. Otherwise the combination possibilities are determined by
the resistance of the materials to constant and peak temperatures, chemicals
and mechanical stresses.
The
material make-up of Frenzelit expansion joints is based on the following materials
Polyester
fabric
Carrier
fabric having high strength and abrasion resistance applicable up to 150 degr.
C
"novaTEX"
made from aramide fibre
especially
high strength, abrasion and friction resistant, good resistance to chemicals
"isoGLAS"
low-cost
substitutes with temperature resistance up to max. 450 degr. C
"isoTHERM
800"
from
finished filament yarns, reinforced with stainless steel wires. Resistant to
temperatures up to max. 800 degr. C
"isoTHERM
1000"
increased
resistance to temperatures owing to chemical conversion of the 6m fine mineral
fibres
Silicate
fabric
temperature
resistant to in excess of 1000 degr. C, outstanding resistance to chemicals
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Lamination
of the material layers
The
layers of the expansion joint in front of the sealing foil serve mainly to protect
it from extremely high temperatures.
It
is only in vacuum that the material's tensile strength is subjected to stress.
Foils
embedded between the fabric layers act as actual sealing elements and also have
to withstand the temperature and medium load.
The
qualities available extend from neoprene (90 degr. C) to stainless steel (600
degr. C).
The
main function of the external fabric layer is to withstand the internal pressure'
a coating protects if from mechanical damage and aggressive environmental influences.
Various
quality grades of the fabric coatings are produced with special machinery. Only
in exceptional cases does the coating have a sealing function. For the majority
of Frenzelit expansion joints, the individual layers are glued together only
at the flanges.
This
ensures unhindered movement and guarantees high flexibility. In some cases however,
it may be necessary to apply adhesive on all layers covering their entire surface
area.
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Pattern
carpenter's shop
In
the case of simple types of expansion joints the layers of material are laid
upon accurately dimensioned wood frames.
All
complicated forms require and original sized pattern which is individually produced
to the given measurements from wood or polystyrene in our own carpenter's shop.
Survey
of types
All
possible expansion joint types are shown on pages 10 and 11. The important distinguishing
features are.
- type
of flange (across page)
- shape
of the centre section and
- design
of the passage (vertical columns)
Even
where the drawings show only the circular expansion joint diameter, all types
can of course be produced with rectangular passage or with passages which change
from circular to rectangular.
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