CA2507603A1 - Spinning plate - Google Patents

Abstract

The invention relates to a spinning plate for the production of melt-spun fibers in order to produce geotextiles.

Description

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.

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.

2 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.

3 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.

4 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]

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]

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~'

Claims (8)

Claims:

1) Method for the production of geotextiles, characterized in that the production of endless fibers with differing textures occurs in a spinning process, wherein the ratio of finer- and rougher-textured fibers is adjusted as defined and a geotextile with defined properties is produced in the subsequent mechanic and/or hydraulic stitch-bonding.

2) Method according to Claim 1, characterized in that the finer fibers show a texture of 1 - 10 dtex.

3) Method according to Claims 1 or 2, characterized in that the rougher fibers show a texture of 5 - 30 dtex.

4) Method according to one of Claims 1 to 3, characterized in that the ratio of finer fibers is 2- - 95%.

5) Method according to one of Claims 1 to 4, characterized in that 2 or more fibers with differing textures are produced in a spinning process.

6) A spinning plate for the production of melt-spun endless fibers for geotextiles, characterized in that the spinning plate shows borings of varying diameters to produce fibers of varying textures in a spinning process.

7) A spinning plate according to Claim 6, characterized in that the borings show identical or varying non-circular profile shapes.

8) A geotextile produced in a process according to Claims 1 to 5.