EP0989216B1 - Herstellungsverfahren für in Erdbau anwendbarem Gitter - Google Patents

Herstellungsverfahren für in Erdbau anwendbarem Gitter Download PDF

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Publication number
EP0989216B1
EP0989216B1 EP98118203A EP98118203A EP0989216B1 EP 0989216 B1 EP0989216 B1 EP 0989216B1 EP 98118203 A EP98118203 A EP 98118203A EP 98118203 A EP98118203 A EP 98118203A EP 0989216 B1 EP0989216 B1 EP 0989216B1
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EP
European Patent Office
Prior art keywords
melting point
fiber
low
fibers
geogrid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98118203A
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English (en)
French (fr)
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EP0989216A1 (de
Inventor
Yen-Jung c/oIndustrial Technology Research Hu
Pung-Nien c/o Industrial Technology Research Perng
Tien-Pao c/o Industrial Technology Research Chiang
Shi-Chieh J. c/o Industrial Technology Cheng
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Industrial Technology Research Institute ITRI
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Industrial Technology Research Institute ITRI
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Priority to DE69827943T priority Critical patent/DE69827943T2/de
Priority to AT98118203T priority patent/ATE283938T1/de
Priority to EP98118203A priority patent/EP0989216B1/de
Publication of EP0989216A1 publication Critical patent/EP0989216A1/de
Application granted granted Critical
Publication of EP0989216B1 publication Critical patent/EP0989216B1/de
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D9/00—Open-work fabrics
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/242—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads inorganic, e.g. basalt
    • D03D15/267—Glass
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/292—Conjugate, i.e. bi- or multicomponent, fibres or filaments
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/47—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads multicomponent, e.g. blended yarns or threads
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/587—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads adhesive; fusible
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2101/00—Inorganic fibres
    • D10B2101/02—Inorganic fibres based on oxides or oxide ceramics, e.g. silicates
    • D10B2101/06—Glass
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2101/00—Inorganic fibres
    • D10B2101/10—Inorganic fibres based on non-oxides other than metals
    • D10B2101/12—Carbon; Pitch
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
    • D10B2321/021—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polyethylene
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
    • D10B2321/022—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polypropylene
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/06—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of unsaturated alcohols, e.g. polyvinyl alcohol, or of their acetals or ketals
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
    • D10B2331/021—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides aromatic polyamides, e.g. aramides
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/06—Load-responsive characteristics
    • D10B2401/063—Load-responsive characteristics high strength
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/20—Industrial for civil engineering, e.g. geotextiles
    • D10B2505/204—Geotextiles

Definitions

  • Geogrids have been used in various civil engineering and mining applications such as soil stabilization, reinforcement, and other applications. Geogrids, which as their names imply, are primarily two-dimensional in form, can be provided in soft or hard forms. Typically, the soft geogrids comprise intersecting (typically via weaving process) strands made from high tensile strength filaments so as to provide high load support characteristics.
  • the grid openings formed from the intersecting stands typically are rectangular or square in shape, with the strands being placed at an angle of about 90 ° relative to each other. However, other shapes and/or relative angles may be used.
  • the most common process in making geogrids involves the five main steps of: (1) spinning high-strength filament yarns; (2) warping; (3) weaving to form a two-dimensional net structure; (4) coating with polyvinyl chloride (PVC) or asphalt; and (5) drying/solidification to form the final geogrid.
  • the purpose of the step of coating with PVC or asphalt is to cause the high-strength filament yarns to form filament bundles that are aggregated and covered by this matrix of binder material, which also serves as a protective material.
  • the step of prepregging with PVC or asphalt also imparts many desired properties, such as UV-resistance and acid/base-resistances, to the grid structures.
  • the conventional geogrids have a major limitation in that, because there is no binder material between the individual fibers within each fiber bundle, they lack the desired junction strength. While sever inventions have be disclosed to improve the properties of geogrids, they have not solved this problem. Therefore, it is desirable to develop an improved process so as to overcome this problem and enhance the applicability of geogrids. It is also equally desirable to develop an improved process which would make the manufacturing of geogrids environmentally compatible.
  • U. S. Pat. No. 5,669,796 discloses a heat bonded geogrid fabric having a woven or warp knit, weft inserted grid. It comprises a bicomponent fiber with filaments each having a sheath of an adhesive polyolefin material comprising a polyolefin and an adhesive and containing about 0.5 wt% to about 2 wt% carbon black and a core of polyethylene terephthalate having an intrinsic viscosity of at least 0.89 deciliters per gram as determined from a solvent base of orthochlorophenol at 25 °C.
  • the bicomponent fiber having the sheath-core configuration is prepared by melt-extruding polymer from a spinneret.
  • thermoplastic or asphalt
  • coating i.e., dipping
  • the composite yarn disclosed in the present invention comprises at least one high-melting point filament yarn and a plurality of low-melting point staple fibers.
  • the high-melting point filament yarn should possess the qualities of high strength, high modules and low strain rate, so as to provide the function as a reinforcement material for the woven geogrid.
  • Examples of the high-melting point filament yarns that can be used in the present invention include polyesters, such as polyethylene terphthalate (PET), polybutylene terephthalate (PBT), etc; polyamides, such as nylon 6, nylon 66, etc; glass fibers; polyvinyl alcohol fibers; carbon fibers; and aramid fibers.
  • the process disclosed in the present invention does not require the equipment and steps for receiving, containing and melting a thermoplastic (or asphalt) feed, nor does it requires the equipment and steps for coating the molten thermoplastic onto a geotextile fabric. Both of these elements are required by the prior art processes, which involve the handling of a very hot (typically above 150 °C) molten polymer or asphalt mass. As a result, the prior art processes often require relatively expensive equipment and often result in a highly hazardous work environment. Furthermore, the unused thermoplastic resin or asphalt mass can cause serious disposal problems and often present environmental headaches.
  • the process disclosed in the present invention also allows the binder composition (i.e., the low melting point stable fibers) to effectively and intimately cover the filament yarn.
  • the binder composition i.e., the low melting point stable fibers
  • This is another distinct advantage over all of the prior art processes, in which the binder composition only covers the filament bundles.
  • the wrapping of the binder fiber composition outside and around the individual composite yarn allows the geogrids made from the process disclosed in the present invention to exhibit superior qualities over those made from the prior art processes, especially with regard to the junction strength and retained strength after elongation.
  • the present invention thus not only allows a superior geogrid to be made, it also enables the product to be made in a more cost-effective and environmentally-conscientious manner.
  • At least one high-melting point fiber filament yarn and a plurality of low-melting point fibers are first spun to form a composite yarn.
  • the composite yarn is then woven into a net structure with a predetermined grid opening, which can be a rectangular or square shape with a predetermined grid dimension.
  • the woven net structure made from the composite yarns is then heated to cause the low-melting point staple fiber to melt and thereby forming a wrapping outside and around the high-melting point fibers.
  • a soft geogrid with excellent mechanical and chemical properties is provided.
  • the grid structure can be made from a manufacturing plant or at the construction site.
  • the composite yarn disclosed in the present invention preferably comprises one or more high-melting point multi-filament yarns and a plurality of low-melting point staple fibers. It is preferred that the composite yarn contain the high-melting point filament yarns and the low-melting point multi-filament yarn at a ratio of 50 ⁇ 70% to 30 ⁇ 50%, by weight, of the fibers.
  • the high-melting point and low-melting point fibers can be provided as simple fibers, or the low-melting point fibers can be provided as bi-component fibers. If bi-component staple fibers are used, they can be either sheath-and-core type or side-by-side type.
  • the high-melting point filament yarn which provides the function as a reinforcement material for the polymeric geogrid, should possess the desired qualities of high strength, high modules and low strain rate.
  • Preferred examples of the high-melting point fibers that can be used in the present invention include polyesters, such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc; and polyamides, such as nylon 6, nylon 66, etc. Glass fibers, polyvinyl alcohol fibers, carbon fibers, and aramid fibers may also be used as the reinforcement component.
  • a distinct feature of the process disclosed in the present invention is that the present invention does not require the costly and messy coating step which has always been required in the prior art processes. Rather, the present invention uses the composite yarn comprising high-melting point filament yarns and low-melting point staple fibers in the weaving process.
  • This novel approach allows the process disclosed in the present invention to eliminate the need for the coating equipment, its also reduces the plant size and the cost for other equipment. As a result, the process disclosed in the present invention was able to greatly reduce the processing time and minimize potential environmental pollution problems.
  • the geogrids produced from the process disclosed in the present invention also exhibit unexpectedly superior qualities.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Woven Fabrics (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Multicomponent Fibers (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Cultivation Of Seaweed (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Claims (16)

  1. Verfahren zur Herstellung von Geogittern umfassend die folgenden Schritte:
    (a) Verbinden von wenigstens einer Faser mit einem hohen Schmelzpunkt in Form eines Fadengarns mit wenigstens einer Faser mit einem niedrigen Schmelzpunkt in Form einer Stapelfaser, um ein Kompositgarn zu bilden, wobei die Faser mit einem niedrigen Schmelzpunkt, einen Schmelzpunkt von wenigstens 10 °C unterhalb des Schmelzpunktes der Faser mit einem hohen Schmelzpunkt besitzt;
    (b) Weben des Kompositgarns, um netzstrukturiertes Gewebe zu bilden;
    (c) Erhitzen der netzstrukturierten Gewebe, um die Faser mit dem niedrigen Schmelzpunkt zum Schmelzen zu bringen und die Faser mit dem hohen Schmelzpunkt zu umhüllen; und
    (d) Abkühlen der netzstrukturierten Gewebe, um ein Geogitter zu bilden.
  2. Verfahren zur Herstellung von Geogittern nach Anspruch 1, wobei der Schmelzpunkt der Faser mit einem niedrigen Schmelzpunkt wenigstens 20 °C unterhalb des Schmelzpunktes der Fadenfaser mit einem hohen Schmelzpunkt liegt.
  3. Verfahren zur Herstellung von Geogittern nach Anspruch 1, wobei das Kompositgarn eine Vielzahl von Fadengarnen mit einem hohen Schmelzpunkt und eine Vielzahl von Stapelfasern mit einem niedrigen Schmelzpunkt umfasst.
  4. Verfahren zur Herstellung von Geogittern nach Anspruch 1, wobei die Faser mit einem hohen Schmelzpunkt ausgewählt wird aus der Gruppe, bestehend aus Polyethylenterephthalat, Polybutylenterephthalat, Polyamiden, Glasfasern, Aramidfasern und Kohlenstofffasern.
  5. Verfahren zur Herstellung von Geogittern nach Anspruch 4, wobei das Polyamid Nylon 6 oder Nylon 66 ist.
  6. Verfahren zur Herstellung von Geogittern nach Anspruch 1, wobei die Faser mit einem niedrigen Schmelzpunkt ausgewählt wird aus der Gruppe, bestehend aus Polyethylen, Polypropylen, Polyestercopolymeren und Polyamiden.
  7. Verfahren zur Herstellung von Geogittern nach Anspruch 6, wobei das Polyamid Nylon 6 oder Nylon 66 ist.
  8. Verfahren zur Herstellung von Geogittern nach Anspruch 1, wobei die Faser mit einem niedrigen Schmelzpunkt eine Zweikomponentenfaser ist.
  9. Verfahren zur Herstellung von Geogittern nach Anspruch 8, wobei die Zweikomponentenfaser eine Faser vom Hüllen-und-Kern-Typ oder Seite-an-Seiten-Typ ist.
  10. Verfahren zur Herstellung von Geogittern nach Anspruch 1, wobei das Kompositgarn ungefähr 50 bis 70 Gewichtsprozent der Faser mit einem hohen Schmelzpunkt von ungefähr 30 bis 50 Gewichtsprozent der Faser mit einem niedrigen Schmelzpunkt umfasst.
  11. Verfahren zur Herstellung von Geogittern nach Anspruch 1, wobei die Faser mit einem hohen Schmelzpunkt, einen Schmelzpunkt von oberhalb von 150 °C besitzt.
  12. Verfahren zur Herstellung von Geogittern nach Anspruch 1, wobei die Faser mit einem hohen Schmelzpunkt und die Faser mit einem niedrigen Schmelzpunkt durch gleichzeitiges Verspinnen gebildet werden, um das Kompositfadengarn zu bilden.
  13. Verfahren zur Herstellung von Geogittern nach Anspruch 1 oder 11, wobei der Schritt (a) ein gleichzeitiges Verspinnen von wenigstens einer Faser mit einem hohen Schmelzpunkt in Form eines Fadengarns mit wenigstens einer Faser mit einem niedrigen Schmelzpunkt in Form einer Stapelfaser umfasst, um ein Kompositgarn zu bilden.
  14. Polymeres Geogitter, umfassend eine Vielzahl von sich überkreuzenden längsgerichteten und quergerichteten Kompositgarnen, wobei jedes der Kompositgarne eine Vielzahl von ersten Fasern umfasst, die auf eine voneinander getrennte Weise von einem polymeren Bindemittelharz umhüllt sind, wobei das polymere Geogitter nach einem Verfahren, umfassend die folgenden Schritte hergestellt wird:
    (a) gemeinsames Verspinnen einer Vielzahl von ersten Fasern in Form von Fadengarnen mit einer Vielzahl von zweiten Fasern in Form von Stapelfasern, die aus diesem polymeren Bindemittel hergestellt sind, um ein Kompositgarn zu bilden, wobei die erste Faser einen Schmelzpunkt besitzt, der wenigstens 10 °C höher ist als der Schmelzpunkt der zweiten Faser;
    (b) Weben des Kompositgarns, um netzstrukturierte Gewebe zu bilden;
    (c) Erhitzen der netzstrukturierten Gewebe, um die Faser mit dem niedrigen Schmelzpunkt zum Schmelzen zu bringen und die Faser mit dem hohen Schmelzpunkt zu umhüllen; und
    (d) Abkühlen der netzstrukturierten Gewebe, um ein Geogitter zu bilden.
  15. Geogitter nach Anspruch 14, wobei die erste Faser ausgewählt wird aus der Gruppe bestehend aus Polyethylenterephthalat, Polybutylenterephthalat, Polyamiden, Glasfasern, Aramidfasern und Kohlenstofffasern.
  16. Geogitter nach Anspruch 14, wobei die zweite Faser ausgewählt wird aus der Gruppe bestehend aus Polyethylen, Polypropylen, Polyestercopolymeren und Polyamiden.
EP98118203A 1998-09-25 1998-09-25 Herstellungsverfahren für in Erdbau anwendbarem Gitter Expired - Lifetime EP0989216B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69827943T DE69827943T2 (de) 1998-09-25 1998-09-25 Herstellungsverfahren für in Erdbau anwendbarem Gitter
AT98118203T ATE283938T1 (de) 1998-09-25 1998-09-25 Herstellungsverfahren für in erdbau anwendbarem gitter
EP98118203A EP0989216B1 (de) 1998-09-25 1998-09-25 Herstellungsverfahren für in Erdbau anwendbarem Gitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98118203A EP0989216B1 (de) 1998-09-25 1998-09-25 Herstellungsverfahren für in Erdbau anwendbarem Gitter

Publications (2)

Publication Number Publication Date
EP0989216A1 EP0989216A1 (de) 2000-03-29
EP0989216B1 true EP0989216B1 (de) 2004-12-01

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EP98118203A Expired - Lifetime EP0989216B1 (de) 1998-09-25 1998-09-25 Herstellungsverfahren für in Erdbau anwendbarem Gitter

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EP (1) EP0989216B1 (de)
AT (1) ATE283938T1 (de)
DE (1) DE69827943T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201840921A (zh) * 2017-03-30 2018-11-16 小智研發股份有限公司 熱塑性布及以此熱塑性布製成的物件

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4960349A (en) * 1988-12-05 1990-10-02 Nicolon Corporation Woven geotextile grid
DE4243465A1 (en) * 1991-12-28 1993-07-01 Basf Ag Hybrid yarn with polyamide and reinforcing fibres - has 5-20 micron polyamide filaments to give greater strength fabrics and consolidated composites
DE29504780U1 (de) * 1995-03-21 1995-07-20 Hoechst Trevira Gmbh & Co Kg Verformbare, hitzestabilisierbare offene Netzstruktur
US5669796A (en) * 1995-11-02 1997-09-23 Hoechst Celanese Corporation Geogrid composed of polyethylene terephthalate and polyolefin bicomponent fibers

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DE69827943T2 (de) 2005-12-22
ATE283938T1 (de) 2004-12-15
DE69827943D1 (de) 2005-01-05
EP0989216A1 (de) 2000-03-29

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