EP0510682A1 - Netz-Gewebe zum Verwenden bei Strassen- und Bauarbeiten und eine Methode zur dessen Herstellung - Google Patents

Netz-Gewebe zum Verwenden bei Strassen- und Bauarbeiten und eine Methode zur dessen Herstellung Download PDF

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Publication number
EP0510682A1
EP0510682A1 EP92107048A EP92107048A EP0510682A1 EP 0510682 A1 EP0510682 A1 EP 0510682A1 EP 92107048 A EP92107048 A EP 92107048A EP 92107048 A EP92107048 A EP 92107048A EP 0510682 A1 EP0510682 A1 EP 0510682A1
Authority
EP
European Patent Office
Prior art keywords
warp
yarns
strand
weft
mesh sheet
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.)
Ceased
Application number
EP92107048A
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English (en)
French (fr)
Inventor
Yoshiji Morimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyobo Co Ltd
Original Assignee
Toyobo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyobo Co Ltd filed Critical Toyobo Co Ltd
Publication of EP0510682A1 publication Critical patent/EP0510682A1/de
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D9/00—Open-work fabrics
    • 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
    • D10B2101/00—Inorganic fibres
    • D10B2101/20—Metallic fibres
    • 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
    • D10B2401/062—Load-responsive characteristics stiff, shape retention
    • 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

  • the present invention relates to a mesh sheet which is used as a reinforcing and shielding material in the field of civil engineering and construction.
  • the mesh sheet of the present invention is useful as a soil-reinforcing material for reclamation or raising the ground level in the field of civil engineering.
  • the present invention also relates to a method for the production of the sheet.
  • lattice sheets i.e., mesh sheets which have been marketed under the trade name "GIOGRID", "GEOTEXTILE” or the like. They are placed between layers of soil so that soils above and below the sheets are connected each other in the form of a bridge through the mesh holes of the sheets and are integrated with the sheets to reinforce soil layers (interlocking effect).
  • mesh sheets are classified into woven materials and knitted materials. These materials are optionally impregnated or coated with a resin.
  • the knitted materials which have been widely used are classified into those prepared by the weft-insertion process in which weft strands are inserted over the entire knitting width and those prepared by the warp-insertion process in which warp strands are inserted over the entire knitting length.
  • a typical example of the warp-insertion process is disclosed in Japanese Utility Model Publication No. 2-17030.
  • a reed having a gauge of, for example, 2000 d/guide is provided (whether the warp strand is inserted at once or not depends on the size of a lattice to be formed), and a warp yarn of 2000 d in fineness is inserted through the spacing between needles into the loops made of each base knitting yarn (in this case, four base knitting yarns per one warp strand are used) which is being prepared from another reed.
  • another yarn is prepared from still another reed which is different from that for the base knitting yarns, and is inserted thereinto as a tightening yarn through the alternate spacings between needles so that every two warp yarns inserted into the loops of the corresponding base knitting yarns are combined with each other using one tightening yarn to form a strand.
  • the distance between the adjacent warp yarns of 2000 d in fineness, which have been inserted in the same distance as the gauge of the reed is decreased, resulting in a warp strand of 8000 d.
  • the mesh sheet using such a warp strand has the following advantages: first, both of the warp and weft strands become straight at the intersection therebetween and there is no flex of the warp and weft strands, so that they have an excellent tenacity utilization; and secondly, it is possible to prepare such a mesh sheet so long as the warp yarns prior to insertion (in this case, they has a fineness of 2000 d) themselves can pass through the guide holes of the yarn reed.
  • a number of warp yarns delivered from many guides must be combined with each other to form a warp strand. This causes a drawback that such a warp strand has a tendency to become flattened.
  • the present inventor has intensively studied mesh sheets to improve their reinforcing effect.
  • the main object of the present invention is to provide mesh sheets which can prevent decrease in their mesh hole size, even when thicker warp strands are used therein, because each warp strand is composed of a bundle of warp yarns to have a columnar shape, and which is, therefore, excellent in the reinforcing effect arising from the interlocking effect.
  • Another object of the present invention is to provide methods for the production of the above mesh sheets.
  • one base knitting yarn forms a chain stitch and the warp strand composed of a bundle of warp yarns is inserted together into the loops of the chain stitch; or two base knitting yarns supports each warp strand and the warp strand composed of a bundle of warp yarns is positioned between the base knitting yarns and bound up together with the base knitting yarns by use of a binding yarn.
  • the mesh sheet of the present invention is characterized in that a bundle of warp yarns are used for the formation of a warp strand, and therefore, the resulting warp strand can be formed in a columnar shape. Accordingly, the blinding of mesh holes, i.e., the action of decrease in mesh holes size, which arises from the flattening of warp strands, can be reduced, and it is, therefore, possible to prevent a decrease in the interlocking effect when the mesh sheet is buried in the soil as a reinforcing material in the field of civil engineering.
  • a plurality of filament yarns or spun yarns are gathered together to pass through a pipe guide, which are then used as a warp strand, so that the resulting warp strand can be formed into a columnar shape. That is, a plurality of warp yarns are allowed to pass through only one pipe guide, so that substantially uniform stress is applied to each warp yarn, thereby making it possible to prevent the flattening of a warp strand.
  • the mesh sheet of the present invention has a warp-insertion knitted structure including a plurality of warp and weft strands which are arranged in the form of a lattice.
  • Each of the warp strands is composed of a bundle of warp yarns supported by at least one base knitting yarn.
  • the warp strand has a plurality of warp yarns which are inserted into the loops of a chain stitch formed by a base knitting yarn to form a columnar bundle of warp yarns.
  • the warp strand has a plurality of warp yarns which are positioned between two base knitting yarns and are bound up together with the supporting yarns by use of a binding yarn to form a columnar bundle of warp yarns.
  • the weft strands may be conventional weft strands.
  • each of the weft strands is composed of a bundle of weft yarns as in the warp strands because a larger mesh size can be obtained.
  • the yarn of the base knitting yarn may be filament yarn or spun yarn of 3000 d or less in fineness, preferably 2000 d or less, more preferably 1500 d or less, and particularly preferred fineness is 800 d or less.
  • the fineness of warp and weft yarns is not particularly limited, but it is preferred that the warp strand has a fineness of 5000 to 150,000 d and the weft strand has a fineness of 3000 to 150,000 d. Too much finer strands cannot have a satisfactorily tenacity, whereas too much thicker strands have an increased stiffness which makes it difficult to handle them.
  • the material of the warp and weft yarns is not particularly limited, but examples of the material include synthetic fibers, regenerated fibers, natural fibers, and those containing metallic fibers, carbon fibers, aramide fibers or the like. Particularly preferred are polyester fibers.
  • the mesh sheet of the present invention can be produced by the per se known method as described in Examples hereinafter.
  • a selvage can be formed at each end of the mesh sheet according to a conventional manner.
  • the formation of a selvage is useful for the subsequent resin impregnating step, particularly in that the mesh sheet can be treated in a state of tension by fixing it at the selvage with a pin tenter, and for sewing two mesh sheets together without difficulty. It is preferred that the width of the selvage is 30% or less of the entire knitting width of the mesh sheet.
  • the mesh sheet of the present invention may be further treated with an appropriate resin according to a conventional manner to increase its toughness.
  • the mesh sheet is impregnated with an emulsion of the resin and dried to harden the resin.
  • the resin include thermosetting resins such as epoxy resins, and thermoplastic resins such as acrylic resins.
  • Fig. 1 is a schematic diagram showing the warp-insertion knitted lattice structure of a mesh sheet of the present invention.
  • Fig. 2 is a schematic enlarged view showing a warp strand of the mesh sheet of Fig. 1.
  • Fig. 3 is a schematic enlarged view showing a warp strand of another mesh sheet of the present invention.
  • Fig. 4 is a schematic diagram showing the warp-insertion knitted lattice structure of a conventional mesh sheet.
  • Fig. 5 is a schematic enlarged view showing a warp strand of the mesh sheet of Fig. 4.
  • Fig. 1 shows a mesh sheet 10 of the present invention with a warp-insertion knitted structure in which a plurality of columnar warp strands 11 and a plurality of non-columnar weft strands 12 are arranged in the form of a lattice.
  • Fig. 2 shows an enlarged view showing that the warp strand 11 is inserted into the loops of a chain stitch formed by a base knitting yarn 21.
  • Each warp strand 22 has a fineness of 30,000 d and is composed of a plurality of polyester filament yarns of 1500 d in fineness.
  • the mesh sheet of this example was produced by use of a 9-gauge raschel machine of the warp-and-weft insertion type as follows: A plurality of polyester filament yarns of 1500 d in fineness were subjected to warping, and every twenty filament yarns were introduced as a warp strand (in this case, it had a fineness of 30,000 d) through a leading guide into the corresponding pipe of the pipe guide which had been prepared in the same size as the prescribed mesh size.
  • the warping of multi-filament yarns so as to have a prescribed fineness in d/strand makes it possible to prevent the flattening of warp strands.
  • the multi-filament yarns may also be twisted in advance before the warping, to form a strand having the prescribed fineness or having one half to one third thereof.
  • a polyester multi-filament of 250 d in fineness was used to form a chain stitch.
  • the above warp strand of 30,000 d in fineness was inserted through a pipe guide into the loops of this chain stitch.
  • the delivery rate of the chain stitch was set to a great value, because if this rate was decreased, the warp strand had a tendency to meander.
  • the weft strand was inserted into the stitch at the fixed pitch, as described above.
  • the mesh sheet thus obtained was impregnated with an emulsion of acrylic resin and then dried to set the acrylic resin, resulting in a resin-impregnated mesh sheet with increased toughness, as shown in Fig. 1.
  • another polyester multi-filament yarn of 250 d in fineness may be used as a distortion-preventing yarn and knitted in the mesh sheet in the same number as that of the warp strands.
  • a distortion-preventing yarn is inserted into the chain stitch together with the warp strand until it meets the weft strand, and then allowed to move along the weft strand to the position of the adjacent warp strand, after which the distortion-preventing yarn is inserted into the adjacent chain stitch together with the adjacent warp strand until it meets the next weft strand, and then returned along the next weft strand to the position of the original chain stitch, followed by further insertion in the warp direction and repeating these steps.
  • the mesh sheet of this example has the same external appearance as that of Example 1 but has a different structure of warp strands from that of Example 1. That is, as shown in Fig. 3, a plurality of warp yarns 31 in the warp strand 11 are supported in a different way from that of Example 1, i.e., by two base knitting yarns 32 and two binding yarns 33.
  • Such a mesh sheet was produced as follows: In the same manner as that of Example 1, polyester multi-filament yarns of 1500 d in fineness were subjected to warping, and every twenty multi-filament yarns were introduced as a warp strand (in this case, it had a fineness of 30,000 d) through a leading guide into the corresponding pipe of the pipe guide.
  • two polyester multi-filament yarns each of 250 d in fineness were used to support the warp strand therebetween, and the warp strand was combined by inserting it into the central one of three needles in such a manner that the warp strand was enclosed from its front and back faces between the two base knitting yarns which had been formed from the polyester multi-filament yarns each of 250 d in fineness. That is, the warp strand was inserted between the two yarns which were also inserted respectively into the central one of other three needles.
  • a selvage was formed at both ends in the weft direction of the mesh sheet to have a width of 10 cm, which was less than 30% of the entire knitting width of the mesh sheet.
  • thirty-six polyester multi-filament yarns of 1500 d in fineness were used to form a full-closed chain stitch, and thirty-six polyester multi-filament yarns of 250 d in fineness were closely inserted into the stitch as strands of 1500 d in fineness.
  • different thirty-six polyester multi-filament yarns of 250 d in fineness were used to connect the adjacent stitches closely with each other, resulting in a selvage.
  • the selvage at the other end of the mesh sheet was formed in the same way as described above. Of course, the weft strands had also been allowed to pass through the selvages.
  • the mesh sheet thus formed to have the warp strands in a columnar shape was further treated on the warp-knitting machine to cut the end of the selvages with heat for the purpose of preventing the selvages from being unknitted.
  • the mesh sheet thus obtained was impregnated with an emulsion of acrylic resin and then dried to set the acrylic resin, resulting in a resin-impregnated mesh sheet with increased toughness, as shown in Fig. 1.
  • a mesh sheet having the same fineness of warp strands and the same mesh density in meshes/m2 as those of a mesh sheet of the present invention was produced by a conventional process as described in Japanese Utility Model Publication No. 2-17030.
  • Fig. 4 shows a mesh sheet 40 produced by this conventional process.
  • the sheet has a plurality of warp strands 41 and weft strands 42. They are in a non-columnar, flattened shape.
  • Fig. 5 shows an enlarged view of the warp strand of this mesh sheet. In this warp strand, each warp yarn 51 is supported by one base knitting yarn 52 and warp yarns are combined by a tightening yarn 53.
  • the maximum fineness of warp strands which can be used in this warp-knitting machine is in the range of 7500 to 9000 d.
  • a warp strand of 30,000 d in fineness to be desired corresponds to four warp strands of 7500 d in fineness (i.e., 7500 d ⁇ 4 strands), which also means that it is necessary to use twenty multi-filament yarns of 1500 d in fineness (i.e., 1500 d ⁇ 20 yarns).
  • Such four warp strands of 7500 d in fineness per guide were inserted in the warp direction, and a tightening yarn of 250 d in fineness was used to combine these warp strands with each other by inserting thereinto through the alternate spacings between needles.
  • the delivery rate of the tightening yarn was decreased, so that four warp strands were drawn near to run parallel with each other, resulting in a flattened composite warp strand.
  • the flattened composite warp strand had a width of about 5.2 to 5.5 mm.
  • the mesh sheet was designed to have a mesh size of 20 mm ⁇ 20 mm in inner dimension, so that the mesh density became to be 39 meshes/m2.
  • a mesh sheet having the same mesh size as described above was produced by the process of the present invention.
  • the warp strand of 30,000 d in fineness had a width of 2.55 mm, so that the mesh density became to be 44 meshes/m2, which indicated a 12.8% increase in the mesh density, although the designed tenacity (i.e., the fineness of warp strands was the same; however, columnar strands had a greater tenacity contribution than that of flattened composite strands) and mesh size of the sheet were the same in both cases.
  • warp strands were expected to have an increased width of around 10 mm, so that the mesh density became 33 meshes/m2, which indicated a 33.3% increase.
  • the mesh sheet of the present invention when buried in the soil as a reinforcing material in the field of civil engineering, can attain an improved interlocking effect on the soil as compared with the conventional mesh sheet.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Of Fabric (AREA)
EP92107048A 1991-04-26 1992-04-24 Netz-Gewebe zum Verwenden bei Strassen- und Bauarbeiten und eine Methode zur dessen Herstellung Ceased EP0510682A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3124993A JP2934527B2 (ja) 1991-04-26 1991-04-26 土木・建築用メッシュシート
JP124993/91 1991-04-26

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Publication Number Publication Date
EP0510682A1 true EP0510682A1 (de) 1992-10-28

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EP92107048A Ceased EP0510682A1 (de) 1991-04-26 1992-04-24 Netz-Gewebe zum Verwenden bei Strassen- und Bauarbeiten und eine Methode zur dessen Herstellung

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EP (1) EP0510682A1 (de)
JP (1) JP2934527B2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6429153B1 (en) * 1995-06-01 2002-08-06 Huesker Synthetic Gmbh & Company Textile composite material
WO2017068563A1 (en) * 2015-10-22 2017-04-27 Nine Ip Limited Crop netting material
WO2017106906A1 (en) * 2015-12-22 2017-06-29 Gale Pacific Limited A knitted fabric

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4822528B2 (ja) * 2006-10-25 2011-11-24 株式会社Ｓｈｉｎｄｏ シート状炭素繊維編物およびその製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2707001A1 (de) * 1976-03-16 1977-09-22 Vyzk Ustav Pletarsky Gewirkte oder naehgewirkte textilien und naehwirkmaschinen zu ihrer herstellung
FR2572426A1 (fr) * 1984-10-31 1986-05-02 Nord Sa Union Textile Geotextile.
WO1987003250A1 (en) * 1985-11-22 1987-06-04 Peabody Abc Corporation Warp knit weft insertion fabric and plastic sheet reinforced therewith
DE3728255A1 (de) * 1987-08-25 1989-03-09 Huesker Synthetic Gmbh & Co Erdankerband
JPH0217030U (de) * 1988-07-22 1990-02-02

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2707001A1 (de) * 1976-03-16 1977-09-22 Vyzk Ustav Pletarsky Gewirkte oder naehgewirkte textilien und naehwirkmaschinen zu ihrer herstellung
FR2572426A1 (fr) * 1984-10-31 1986-05-02 Nord Sa Union Textile Geotextile.
WO1987003250A1 (en) * 1985-11-22 1987-06-04 Peabody Abc Corporation Warp knit weft insertion fabric and plastic sheet reinforced therewith
DE3728255A1 (de) * 1987-08-25 1989-03-09 Huesker Synthetic Gmbh & Co Erdankerband
JPH0217030U (de) * 1988-07-22 1990-02-02

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6429153B1 (en) * 1995-06-01 2002-08-06 Huesker Synthetic Gmbh & Company Textile composite material
WO2017068563A1 (en) * 2015-10-22 2017-04-27 Nine Ip Limited Crop netting material
WO2017106906A1 (en) * 2015-12-22 2017-06-29 Gale Pacific Limited A knitted fabric
US10844527B2 (en) 2015-12-22 2020-11-24 Gale Pacific Limited Knitted fabric

Also Published As

Publication number Publication date
JPH04327247A (ja) 1992-11-16
JP2934527B2 (ja) 1999-08-16

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