Note: Descriptions are shown in the official language in which they were submitted.
CA 02507603 2005-05-26
Spinning Plate
The invention relates to a spinning plate for the production of melt-spun
fibers in order to
produce geotextiles.
Geotextiles are used in many areas of technology, especially for the anchorage
of slopes and
acclivities, as a support for concrete or asphalt surfaces such as roads,
airports, pathways,
bridges and similar, and, more specifically, they are used for new buildings
as well as for
restoration. Depending on the specific application area, certain requirements
are applied to
stability, solidity and water permeability of the geotextiles.
un the production of geotextiles, so far fibers and filaments of various
defined textures have
been produced and stitch-bonded, depending on the required property. The finer
the fibers
or filaments, the more solid and stable the geotextile after stitch-bonding;
the rougher-
textured the fibers or filaments, the higher the geotextile' s water
permeability.
If necessary, separately produced fine fibers are additionally mixed in prior
to the stitch-
bonding of a geotextile, to achieve an appropriate solidity and stability.
It was the task of the present invention to provide a method and a device for
the production
of geotextiles consisting of fibers or filaments of various textures, in which
the mixing
and/or the adjusting of the fiber mixture does not occur in a complex manner
after the
production of fibers and filaments, but instead already occurs during the
production of
fibers and/or filaments.
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The subject matter of the present invention is therefore a method for
producing geotextiles
that is characterized in that the production of endless fibers of various
textures occurs in a
spinning process, which allows for the proportion of finely and coarsely
textured fibers to
be adjusted as defined and for a geotextile with defined properties to be
produced during the
subsequent mechanical and/or hydraulic stitch-bonding.
Another subject matter of the present invention is a spinning plate for the
production of
melt-spun endless fibers for geotextiles, characterized in that the spinning
plate has borings
of varying diameters for the production of fibers with varying textures during
a spinning
process.
The desired stability and solidity of the finished geotextile can be adjusted
by the quota of
finer fibers. The quota of rougher-textured fibers determines the hydraulic
properties of the
finished geotextile, for example the water permeability in the non-woven
fabric level and/or
vertical to it.
The higher the quota of fine fibers, the firmer and more stable the geotextile
subsequently
produced by mechanical and/or hydraulic stitch-bonding will become. The higher
the quota
of rougher-textured fibers, the greater the geotextile's water permeability
after mechanical
and/or hydraulic stitch-bonding.
As raw materials for fine as well as rougher fibers, synthetic materials can
be used, such as
polypropylene, polyethylene, polyamide or polyester.
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Fine fibers, which serve in the mechanical and/or hydraulic stitch-bonding of
the
geotextile, mean fibers of a texture of 1 - 10 dtex, preferably 1 - 7 dtex.
Rougher fibers
have a texture of 6 - 30 dtex, preferably 7 - 27 dtex, depending on the
selected texture of
the finer fibers.
Preferably, the textures of the fiber types differ by a factor of 3 to 20;
especially preferred is
4-6.
The quota of fme fibers in the finished geotextile can be 20 - 95%, preferably
30 - 90%,
depending on the selected textures and on the desired properties, such as
particularly the
desired combination of solidity, stability and water permeability.
It is also possible, however, to use more than 2 fibers of differing textures.
this case, three
or more fibers of differing textures are used to produce the geotextile,
wherein the
selection of textures once again depends on the desired properties of the
finished
geotextile.
The fibers of differing textures are produced in a spinning process, using a
spinning plate
according to the present invention. Afterwards, the fibers are deposited in
the usual
manner and stitch-bonded mechanically and/or hydraulically, chemically and/or
thermically.
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To produce a defined mixture of fibers or filaments of differing textures, a
spinning plate
with various defined borings is used; thus, the mixture ratio of the fibers
and their textures
is already defined during the production of the fibers.
This spinning plate according to the present invention shows borings with
varying capillary
diameters for the simultaneous production of endless fibers with varying
textures.
In this, the capillary diameters of the borings are measured in such a way
that the fibers of
varying textures can be produced at the same time in the desired ratio.
The borings can be arranged in regular intervals as well as randomly
distributed across the
spinning plate.
The capillary borings can have suitable shapes depending on the desired fiber
profile
(trilobal, octalobal, star-shaped, hollow, triangular, triangularly hollow,
etc.), wherein the
profiles of the fine and rougher fibers or, if applicable, other applied
fibers, may differ.
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Example 1:
Standard geotextile
I Raw material (granulate) Polypropylene
Quota of finer filaments, % 100
Filament yarn count, dtex 4
Quota of rougher filaments, 0
%
Filament thread count, dtex
Mass per unit area, g/m' 250
Strip tension resistance EN
ISO 10319,
kN/m
Longitudinal 19.1
Transverse 19.4
Water permeability in the geotextile3.0 *lo-'
section
EN ISO 12958, 20 kPa, i=1, [Urns]
Water permeability vertical 5.1 *l0-1
to section EN
ISO 11058, VI Hso, [Ums]
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Example 2:
Raw material (granulate) Polypropylene
Quota of finer filaments, % 90
Filament yarn count, dtex 4
Quota of rougher filaments, 10
%
Filament thread count, dtex 18
Mass per unit area, g/m' 250
Strip tension resistance EN
ISO 10319,
N/m
Longitudinal 1 g, g
Transverse 19.0
Water permeability vertical 8.2 * 10-3
to section
EN ISO 12958, 20 kPa, i=1, [1/ms]
Water permeability vertical 8.4 * 10-l
to section
EN ISO 11058, VI Hso, [1/ms]
CA 02507603 2005-05-26
Example 3:
Raw material (granulate) Polypropylene
Quota of finer filaments, % '"
Filament yarn count, dtex
Quota of rougher filaments,
Filament thread count, dtex i'
Mass per unit area, g/m' "v
Strip tension resistance EN
ISO 10319,
N/m
Longitudinal ~ a. ~
Water permeability vertical
to section
Water permeability vertical 1.1 * 10 2
to section
EN ISO 11058, VI HSa, [1/ms]
1.2 * 10~'
