JP2019120013A - Sucking preventing sheet and manufacturing method of the same - Google Patents
Sucking preventing sheet and manufacturing method of the same Download PDFInfo
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- JP2019120013A JP2019120013A JP2017254106A JP2017254106A JP2019120013A JP 2019120013 A JP2019120013 A JP 2019120013A JP 2017254106 A JP2017254106 A JP 2017254106A JP 2017254106 A JP2017254106 A JP 2017254106A JP 2019120013 A JP2019120013 A JP 2019120013A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000000835 fiber Substances 0.000 claims abstract description 86
- 238000002844 melting Methods 0.000 claims abstract description 85
- 230000008018 melting Effects 0.000 claims abstract description 83
- 230000002265 prevention Effects 0.000 claims description 77
- 244000025254 Cannabis sativa Species 0.000 claims description 54
- 238000010521 absorption reaction Methods 0.000 claims description 33
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000002363 herbicidal effect Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 description 11
- 239000004575 stone Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 241000196324 Embryophyta Species 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012783 reinforcing fiber Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000012209 synthetic fiber Substances 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/11—Hard structures, e.g. dams, dykes or breakwaters
Landscapes
- Catching Or Destruction (AREA)
- Revetment (AREA)
- Laminated Bodies (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
本発明は、護岸下の土砂の吸出しを防止する吸出防止シート及びその製造方法に関する。 BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a suction-preventing sheet for preventing suction of soil under a revetment and a method of manufacturing the same.
従来より、地盤の表面や法面等を木材、石材やコンクリートブロック等で覆って浸食破壊を抑制する護岸が知られている。このような護岸では、石材やコンクリートブロックの隙間から背後地盤または基礎部の土砂が流出する吸出しを防止するために、石材等の下に吸出防止シートを敷設している。 Background Art A revetment has been known in which a surface or a slope of a ground is covered with a wood, a stone, a concrete block or the like to suppress erosion and destruction. In such a revetment, a suction prevention sheet is laid under a stone or the like in order to prevent the suction of the soil behind the ground or the foundation portion from the clearance of the stone or concrete block.
特許文献１には、施工時、法面等に吸出防止シートを敷設した後に、吸出防止シート上に縦横方向にコンクリートブロックを設置してコンクリートブロック同士を連結する連節ブロック工法が開示されている。 Patent Document 1 discloses an articulated block construction method in which concrete blocks are installed in the vertical and horizontal directions on the anti-suction sheet and the concrete blocks are connected after laying the anti-suction sheet on the slope etc. at the time of construction. .
しかしながら、吸出防止シートを用いて土砂の吸出を防止する場合に、フェルト状の空隙を有する吸出防止シートには飛来種や近在植物等が自生・生育しやすく、吸出防止シートの積層繊維内に入り込んだ植物の根茎は、吸出防止シートと一体化して除去しにくく、作業員が時間をかけて抜草しなければならないという問題があった。 However, when using a suction-preventing sheet to prevent suction of earth and sand, flying species, nearby plants, etc. tend to grow spontaneously on the suction-preventing sheet having felt-like voids, and the laminated fibers of the suction-preventing sheet There has been a problem that it is difficult to remove the rhizomes of the intruded plant by integrating it with the suction prevention sheet, and the workers have to take time for drawing out the plants.
そこで、吸出防止シートに除草性を付与することを抑制するために解決すべき技術的課題が生じてくるのであり、本発明は、この課題を解決することを目的とする。 Then, the technical subject which should be solved in order to suppress giving a herbicidal property to a suction prevention sheet arises, and an object of the present invention is to solve this subject.
上記課題を達成するために、本発明に係る吸出防止シートは、護岸に設置される吸出防止シートであって、フェルト状の吸出防止層と、前記吸出防止層上に積層されるとともに前記吸出防止層と一体化された防草層と、を備えている。 In order to achieve the above-mentioned subject, the suction prevention sheet concerning the present invention is a suction prevention sheet installed in a revetment, and while being laminated on a felt-like suction prevention layer and the above-mentioned suction prevention layer, the above-mentioned suction prevention is carried out. And an anti-grass layer integrated with the layer.
この構成によれば、吸出防止層上に防草層が設けられていることにより、吸出防止層に根茎が張ることが抑制されるため、吸出防止シートに除草性を付与することができる。さらに、吸出防止層と防草層とが一体化されていることにより、吸出防止シートを広範囲に敷設する際に、吸出防止層又は防草層が相対的に位置ズレすることが抑制されるため、吸出防止シートの敷設作業を効率的に行うことができる。 According to this configuration, by providing the grass protection layer on the absorption preventing layer, it is possible to suppress the rootstocks from sticking to the absorption preventing layer, and therefore it is possible to provide the absorption preventing sheet with herbicidal properties. Furthermore, since the absorption prevention layer and the grass protection layer are integrated, relative displacement of the absorption prevention layer or the grass protection layer is suppressed when laying the absorption prevention sheet in a wide range. The laying work of the suction prevention sheet can be performed efficiently.
また、本発明に係る吸出防止シートは、前記吸出防止層は、高融点繊維を積層して成り、前記防草層は、前記高融点繊維より融点が低い低融点繊維を溶融して成ることが好ましい。 In the suction prevention sheet according to the present invention, the suction prevention layer is formed by laminating high melting point fibers, and the grass layer is formed by melting low melting point fibers having a melting point lower than that of the high melting point fibers. preferable.
この構成によれば、低融点繊維のみを選択的に溶融させることにより、間隙を備えた吸出防止層及び空隙が圧縮された密な防草層を形成することができる。 According to this configuration, by selectively melting only the low melting point fiber, it is possible to form the suction prevention layer having the gap and the dense grass protection layer in which the gap is compressed.
また、本発明に係る吸出防止シートは、前記防草層は、前記吸出防止層に溶着されていることが好ましい。 In the suction prevention sheet according to the present invention, preferably, the grass layer is welded to the suction prevention layer.
この構成によれば、吸出防止層及び防草層の界面が溶着されることにより、吸出防止層及び防草層を接着剤で接着する場合と比べて、接着剤の経年劣化に起因する吸出防止層及び防草層の分離が回避されるため、吸出防止層及び防草層を長期に亘って一体化することができる。 According to this configuration, the adhesion of the interface between the suction preventing layer and the grass protection layer prevents the suction holding due to the aged deterioration of the adhesive as compared with the case where the suction resistance layer and the grass protection layer are bonded with the adhesive. Since separation of the layer and the grass layer is avoided, the anti-suction layer and the grass layer can be integrated over time.
また、本発明に係る吸出防止シートは、前記吸出防止層には、補強基布が含まれていることが好ましい。 In the suction prevention sheet according to the present invention, preferably, the base material is contained in the suction prevention layer.
この構成によれば、補強基布が吸出防止層内に設けられていることにより、吸出防止層に所望の強度を付与することができる。 According to this configuration, by providing the reinforcing base fabric in the anti-suction layer, it is possible to impart desired strength to the anti-suction layer.
また、本発明に係る吸出防止シートの製造方法は、護岸に設置される吸出防止シートの製造方法であって、第１の繊維を積層して成る第１の繊維層を形成する工程と、第２の繊維を積層して成る第２の繊維層を前記第１の繊維層上に形成する工程と、前記第１の繊維層を圧縮してフェルト状の吸出防止層を形成する工程と、前記第２の繊維層を圧縮して前記吸出防止層と一体化された防草層を形成する工程と、を含む。 Further, a method for producing a suction prevention sheet according to the present invention is a method for producing a suction prevention sheet to be installed on a revetment, comprising the steps of: forming a first fiber layer formed by laminating first fibers; Forming a second fiber layer formed by laminating two fibers on the first fiber layer, compressing the first fiber layer to form a felt-like absorption preventing layer, and Compressing the second fibrous layer to form a grass protection layer integrated with the anti-suction layer.
この構成によれば、吸出防止層上に防草層が設けられていることにより、吸出防止層に根茎が張ることが抑制されるため、吸出防止シートに除草性を付与することができる。さらに、吸出防止層と防草層とが一体化されていることにより、吸出防止シートを広範囲に敷設する際に、吸出防止層又は防草層が相対的に位置ズレすることが抑制されるため、吸出防止シートの敷設作業を効率的に行うことができる。 According to this configuration, by providing the grass protection layer on the absorption preventing layer, it is possible to suppress the rootstocks from sticking to the absorption preventing layer, and therefore it is possible to provide the absorption preventing sheet with herbicidal properties. Furthermore, since the absorption prevention layer and the grass protection layer are integrated, relative displacement of the absorption prevention layer or the grass protection layer is suppressed when laying the absorption prevention sheet in a wide range. The laying work of the suction prevention sheet can be performed efficiently.
また、本発明に係る吸出防止シートの製造方法は、前記第１の繊維は、高融点繊維であり、前記第２の繊維は、前記高融点繊維より融点が低い低融点繊維であることが好ましい。 Further, in the method of producing a suction prevention sheet according to the present invention, preferably, the first fiber is a high melting point fiber, and the second fiber is a low melting point fiber having a melting point lower than that of the high melting point fiber. .
この構成によれば、低融点繊維のみを選択的に溶融させることにより、間隙を備えた吸出防止層及び空隙が圧縮された密な防草層を形成することができる。 According to this configuration, by selectively melting only the low melting point fiber, it is possible to form the suction prevention layer having the gap and the dense grass protection layer in which the gap is compressed.
また、本発明に係る吸出防止シートの製造方法は、前記防草層は、前記吸出防止層に溶着されていることが好ましい。 Further, in the method of manufacturing a suction prevention sheet according to the present invention, preferably, the grass layer is welded to the suction prevention layer.
この構成によれば、吸出防止層及び防草層の界面が溶着されることにより、吸出防止層及び防草層を接着剤で接着する場合と比べて、接着剤の経年劣化に起因する吸出防止層及び防草層の分離が回避されるため、吸出防止層及び防草層を長期に亘って一体化することができる。 According to this configuration, the adhesion of the interface between the suction preventing layer and the grass protection layer prevents the suction holding due to the aged deterioration of the adhesive as compared with the case where the suction resistance layer and the grass protection layer are bonded with the adhesive. Since separation of the layer and the grass layer is avoided, the anti-suction layer and the grass layer can be integrated over time.
また、本発明に係る吸出防止シートの製造方法は、前記低融点繊維は、前記高融点繊維の融点未満で加熱されることが好ましい。 Further, in the method of manufacturing the suction prevention sheet according to the present invention, it is preferable that the low melting point fiber is heated at a temperature lower than the melting point of the high melting point fiber.
この構成によれば、高融点繊維を熱収縮させることなく低融点繊維のみを溶融するため、空隙を有する吸出防止層と空隙が圧縮された密な防草層を形成することができる。 According to this configuration, since only the low melting point fiber is melted without heat shrinking the high melting point fiber, it is possible to form a dense anti-grass layer in which the air absorption preventing layer having the space and the space are compressed.
本発明では、吸出防止層上に防草層が設けられていることにより、吸出防止層に根茎が張ることが抑制されるため、吸出防止シートに除草性を付与することができる。さらに、吸出防止層と防草層とが一体化されていることにより、吸出防止シートを広範囲に敷設する際に、吸出防止層又は防草層が相対的に位置ズレすることが抑制されるため、吸出防止シートの敷設作業を効率的に行うことができる。 In the present invention, by providing the anti-grass layer on the absorption preventing layer, it is possible to suppress the rhizome from being attached to the absorption preventing layer, and therefore it is possible to impart herbicidal properties to the absorption preventing sheet. Furthermore, since the absorption prevention layer and the grass protection layer are integrated, relative displacement of the absorption prevention layer or the grass protection layer is suppressed when laying the absorption prevention sheet in a wide range. The laying work of the suction prevention sheet can be performed efficiently.
本発明の実施形態について図面に基づいて説明する。なお、以下では、構成要素の数、数値、量、範囲等に言及する場合、特に明示した場合及び原理的に明らかに特定の数に限定される場合を除き、その特定の数に限定されるものではなく、特定の数以上でも以下でも構わない。 An embodiment of the present invention will be described based on the drawings. In the following, when referring to the number, numerical value, amount, range, etc. of constituent elements, it is limited to the specific number unless specifically stated and when clearly limited to a specific number in principle. It does not matter and may be more or less than a specific number.
また、構成要素等の形状、位置関係に言及するときは、特に明示した場合及び原理的に明らかにそうでないと考えられる場合等を除き、実質的にその形状等に近似又は類似するもの等を含む。 In addition, when referring to the shapes of components, etc., and positional relationships, those that are substantially similar or similar to the shapes etc., unless specifically stated otherwise or where it is considered to be otherwise clearly apparent in principle Including.
地盤や法面等を石材やコンクリートブロックで覆って保護する護岸には、空張工、練張工、コンクリート張工、連接型ブロック張工等の様々な方式が存在する。以下では、本実施形態に係る吸出防止シート１０を空張工で適用した場合を例に説明するが、空張工以外の方式にも適用可能なことはいうまでもない。 In the revetment which covers and protects a ground or a slope with a stone material or a concrete block, there exist various methods, such as an emptying construction, a niche construction, a concrete expansion construction, and an articulated block tension construction. Although the case where the suction prevention sheet | seat 10 which concerns on this embodiment is applied to a vacant construction is demonstrated to an example below, it can not be overemphasized that it is applicable also to systems other than a vacant construction.
空張工は、図１に示すように、石材１をモルタル等で固めることなく空張りして法面２を覆う方式である。空張工では、石材１が吸出防止シート１０上に載置されている。 As shown in FIG. 1, the hollow work is a method of covering the slope 2 by emptying the stone 1 without setting it with mortar or the like. In the case of a vacant construction work, the stone material 1 is placed on the suction prevention sheet 10.
複数の吸出防止シート１０は、河川の流向（図１の紙面垂直方向）に沿って隙間なく敷設されている。図２に示すように、隣り合う吸出防止シート１０は、一方の端部を他方の端部に重ね合わせるようにして敷設されている。具体的には、河川の上流側に位置する吸出防止シート１０の下流側端部１０ａが、河川の下流側に位置する吸出防止シート１０の上流側端部１０ｂの上になっている。一般的に、吸出防止シート１０の重ね合わせ量は、約１０ｃｍに設定されている。これにより、吸出防止シート１０の継ぎ目からの土砂の流出が抑制される。 The plurality of suction prevention sheets 10 are laid without gaps along the flow direction of the river (vertical direction in the drawing of FIG. 1). As shown in FIG. 2, the adjacent suction preventing sheets 10 are laid in such a manner that one end thereof is superimposed on the other end. Specifically, the downstream end 10a of the suction prevention sheet 10 located on the upstream side of the river is on the upstream end 10b of the suction prevention sheet 10 located on the downstream side of the river. Generally, the overlap amount of the suction prevention sheet 10 is set to about 10 cm. Thereby, the outflow of the earth and sand from the joint of the suction prevention sheet 10 is suppressed.
図２、３に示すように、吸出防止シート１０は、吸出防止層２０と、防草層３０と、を備えている。法面２上に敷設された吸出防止シート１０では、吸出防止層２０が下方で防草層３０が上方に配置されている。すなわち、吸出防止層２０が法面２に対向し、防草層３０が石材に対向している。 As shown in FIGS. 2 and 3, the suction prevention sheet 10 includes a suction prevention layer 20 and a grass protection layer 30. In the suction prevention sheet 10 laid on the slope 2, the grass protection layer 30 is disposed at the upper side with the suction prevention layer 20 at the lower side. That is, the suction prevention layer 20 faces the slope 2 and the grass protection layer 30 faces the stone.
吸出防止層２０は、例えばポリエステル系の合成繊維を圧縮して成る不織布である。吸出防止層２０は、繊維が積層されて内部に大きな空隙を有する構造であり、透水性を有しているものの法面の土砂は通さない。 The suction prevention layer 20 is a non-woven fabric formed by compressing, for example, synthetic fibers of polyester type. The absorption prevention layer 20 has a structure in which fibers are stacked to form a large void inside, and although it has water permeability, it does not pass soil on the slope of the surface.
防草層３０は、例えばポリエステル系の合成繊維を圧縮して成る不織布である。防草層３０は、繊維が圧密された構造であり、吸出防止層２０と比べて内部の空隙が小さい。したがって、防草層３０は、適度な透水性を保有しているものの植物の根茎が防草層３０内に張ることはできない。 The grass protection layer 30 is, for example, a non-woven fabric obtained by compressing synthetic fibers of polyester type. The grass layer 30 has a structure in which fibers are consolidated, and the internal void is smaller than that of the absorption preventing layer 20. Therefore, although the grass layer 30 has appropriate water permeability, the rhizomes of plants can not be stretched in the grass layer 30.
また、防草層３０は、空隙が圧縮された密な構造であって低反発性を有している。また、防草層３０の表面は、低反発で平滑に形成されている。これにより、飛来種等が防草層３０の表面に付着しにくい。 In addition, the grass layer 30 is a dense structure in which the air gap is compressed and has low resilience. Moreover, the surface of the grass protection layer 30 is formed smoothly with low repulsion. This makes it difficult for flying species and the like to adhere to the surface of the grass layer 30.
吸出防止層２０及び防草層３０の界面は溶着されて、吸出防止層２０及び防草層３０は一体化されている。これにより、吸出防止層２０及び防草層３０を接着剤で接着する場合と比べて、接着剤の経年劣化に起因する吸出防止層２０及び防草層３０の分離が回避されて、吸出防止層２０及び防草層３０を長期に亘って一体化することができる。 The interface between the anti-suction layer 20 and the grass layer 30 is welded, and the anti-suction layer 20 and the grass layer 30 are integrated. Thereby, the separation of the absorption preventing layer 20 and the grass protection layer 30 due to the aged deterioration of the adhesive is avoided compared to the case where the absorption preventing layer 20 and the grass protection layer 30 are adhered by the adhesive, and the absorption prevention layer 20 and the grass layer 30 can be integrated over a long period of time.
上述したように、吸出防止層２０と防草層３０とが一体化されていることにより、図２に示すように、吸出防止シート１０を広範囲に敷設する際に、吸出防止層２０及び防草層３０を個別に敷設する場合と比べて敷設作業を効率的に行うことができる。また、吸出防止層２０又は防草層３０が相対的に位置ズレすることが抑制されるため、吸出防止シート１０をさらに効率よく敷設することができる。 As described above, since the absorption preventing layer 20 and the grass protection layer 30 are integrated, as shown in FIG. 2, when laying the absorption preventing sheet 10 in a wide area, the absorption preventing layer 20 and the grass The laying operation can be performed more efficiently than in the case of laying the layers 30 individually. Moreover, since relative displacement of the suction preventing layer 20 or the grass layer 30 is suppressed, the suction preventing sheet 10 can be laid more efficiently.
吸出防止層２０の内部には、補強基布４０が設けられている。補強基布４０は、例えばポリプロピレン系の合成繊維である。吸出防止層２０の繊維は、補強基布４０に絡み付いて固定されている。 Inside the suction prevention layer 20, a reinforcing base fabric 40 is provided. The reinforcing base fabric 40 is, for example, a synthetic fiber of polypropylene. The fibers of the anti-wicking layer 20 are entangled and fixed to the reinforcing base fabric 40.
本実施形態に係る吸出防止シート１０の透水係数は０．０２／ｓｅｃであり、既存の吸出防止シートの透水係数（０．０５／ｓｅｃ）とほぼ変わらないことが確認された。 It was confirmed that the water permeability coefficient of the suction prevention sheet 10 according to the present embodiment is 0.02 / sec, which is substantially the same as the water permeability coefficient (0.05 / sec) of the existing suction prevention sheet.
次に、吸出防止シート１０の製造手順について、図４に基づいて説明する。 Next, the manufacturing procedure of the suction prevention sheet 10 will be described based on FIG.
［高融点繊維積層］
第１のホッパ５０に原料が投入され、混綿して得られた高融点繊維をベルトコンベア６０上に積層する。ベルトコンベア６０は所定の送り速度で運転しており、その速度は例えば３ｍ／ｍｉｎに設定されている。ベルトコンベア６０上に投下された高融点繊維は、所定厚みの層状に撒かれて高融点繊維層を形成する。高融点繊維の融点は、例えば１５０℃以上に設定されている。高融点繊維は、例えば、太さ１０〜３０ｄ、毛の長さ４０〜１３０ｍｍのものが用いられる。高融点繊維の投下量は、例えば１２００ｇ／ｍｍ２である。
[High-melting point fiber lamination]
The raw material is charged into the first hopper 50 and the high melting point fiber obtained by blending is laminated on the belt conveyor 60. The belt conveyor 60 is operated at a predetermined feed speed, and the speed is set to, for example, 3 m / min. The high melting point fibers dropped onto the belt conveyor 60 are wound in layers of a predetermined thickness to form a high melting point fiber layer. The melting point of the high melting point fiber is set to, for example, 150 ° C. or more. As the high melting point fiber, for example, one having a thickness of 10 to 30 d and a hair length of 40 to 130 mm is used. The amount of high melting point fiber is, for example, 1200 g / mm 2.
［補強基布セット］
次に、高融点繊維層の表面に補強基布４０となる補強繊維を配列する。補強繊維は、ベルトコンベア６０の搬送方向及び搬送方向に垂直な水平方向に沿って補強繊維を配向して高融点繊維上に敷かれる。補強基布の投下量は、例えば１００ｇ／ｍｍ２である。
[Reinforcement base set]
Next, reinforcing fibers to be a reinforcing base 40 are arranged on the surface of the high melting point fiber layer. The reinforcing fibers are laid on the high melting point fiber by orienting the reinforcing fibers along the conveying direction of the belt conveyor 60 and the horizontal direction perpendicular to the conveying direction. The amount of dropping of the reinforcing base fabric is, for example, 100 g / mm 2.
［低融点繊維積層］
次に、第２のホッパ７０に低融点繊維が投入され、高融点繊維層の表面に低融点繊維を積層する。ベルトコンベア６０上に投下された低融点繊維は、所定厚みの層状に撒かれて低融点繊維層を形成する。低融点繊維は、高融点繊維より融点が低い低融点繊維であり、その融点は約１００℃に設定されている。低融点繊維は、太さ３〜３０ｄ、毛の長さ４１〜１２８ｍｍのものが用いられる。低融点繊維の投下量は、例えば３００ｇ／ｍｍ２である。
[Low-melting fiber laminate]
Next, the low melting point fiber is charged into the second hopper 70, and the low melting point fiber is laminated on the surface of the high melting point fiber layer. The low melting point fibers dropped onto the belt conveyor 60 are wound in layers of a predetermined thickness to form a low melting point fiber layer. The low melting point fiber is a low melting point fiber having a melting point lower than that of the high melting point fiber, and the melting point is set to about 100 ° C. As the low melting point fiber, one having a thickness of 3 to 30 d and a hair length of 41 to 128 mm is used. The amount of low melting point fiber is, for example, 300 g / mm 2.
［１次圧縮］
次に、ニードルパンチ８０で高融点繊維層及び低融点繊維層を圧縮する。ニードルパンチ８０は、公知の構成である。高融点繊維及び低融点繊維は、高速で上下するニードルが繰り返し突き刺されることにより絡み合う。
[Primary compression]
Next, the high melting fiber layer and the low melting fiber layer are compressed by the needle punch 80. Needle punch 80 is of known construction. The high melting point fiber and the low melting point fiber are entangled by repeated piercing of the needle moving up and down at high speed.
［２次圧縮］
次に、高温ローラー９０で高融点繊維層及び低融点繊維層を高温で圧縮する。高温ローラー９０の温度は、低融点繊維の融点以上かつ高融点繊維の融点未満に設定され、例えば１５０℃に設定される。したがって、高温ローラー９０に接触する低融点繊維層は、溶融する一方で、高温ローラー９０に低融点繊維層を介して押圧される高融点繊維層は、溶融することなく圧縮される。
[Secondary compression]
Next, the high melting point fiber layer and the low melting point fiber layer are compressed at a high temperature by the high temperature roller 90. The temperature of the high temperature roller 90 is set to a temperature equal to or higher than the melting point of the low melting point fiber and less than the melting point of the high melting point fiber, for example, 150 ° C. Therefore, the low melting fiber layer in contact with the high temperature roller 90 melts, while the high melting fiber layer pressed against the high temperature roller 90 through the low melting fiber layer is compressed without melting.
高融点繊維層は、熱収縮を起こすことなく厚み方向に圧縮されてフェルト状の吸出防止層２０が形成される。 The high melting point fiber layer is compressed in the thickness direction without causing thermal contraction to form a felt-like absorption preventing layer 20.
低融点繊維層は、厚み方向に圧縮されると共に高温ローラー９０で加熱されることにより、低融点繊維が溶融するとともに低融点繊維層が圧密化されて空隙が圧縮され、緻密な積層構造の防草層３０が形成される。また、高温ローラー９０が低融点繊維層を加熱しながら高融点繊維層に押し付けることにより、吸出防止層２０及び防草層３０の界面が溶着される。 The low melting point fiber layer is compressed in the thickness direction and heated by the high temperature roller 90 so that the low melting point fiber is melted and the low melting point fiber layer is consolidated to compress the voids and prevent the dense laminated structure A grass layer 30 is formed. Further, when the high temperature roller 90 presses the low melting point fiber layer against the high melting point fiber layer while heating, the interface between the suction preventing layer 20 and the grass layer 30 is welded.
［シート巻取］
吸出防止層２０及び防草層３０が形成された吸出防止シート１０を巻取機でロール状に巻き取られる。
[Sheet winding]
The suction prevention sheet 10 on which the suction prevention layer 20 and the grass protection layer 30 are formed is taken up in a roll by a winder.
このようにして、本実施形態に係る吸出防止シート１０は、吸出防止層２０上に防草層３０が設けられていることにより、吸出防止層２０に根茎が張ることが抑制されるため、吸出防止シート１０に除草性を付与することができる。さらに、吸出防止層２０と防草層３０とが一体化されていることにより、吸出防止シート１０を広範囲に敷設する際に、吸出防止層２０又は防草層３０が相対的に位置ズレすることが抑制されるため、吸出防止シート１０の敷設作業を効率的に行うことができる。 In this manner, in the suction prevention sheet 10 according to the present embodiment, since the herbaceous layer 30 is provided on the suction prevention layer 20, the rhizomes are suppressed from being stretched on the suction prevention layer 20. The prevention sheet 10 can be provided with herbicidal properties. Furthermore, when the absorption prevention layer 20 and the grass protection layer 30 are integrated, the absorption prevention layer 20 or the grass protection layer 30 is relatively displaced when laying the absorption prevention sheet 10 in a wide range. Of the suction-preventing sheet 10 can be efficiently performed.
また、低融点繊維のみを選択的に溶融させることにより、間隙を備えた吸出防止層２０及び空隙が圧縮された密な防草層３０を形成することができる。 Further, by selectively melting only the low melting point fiber, it is possible to form the suction preventing layer 20 having a gap and the dense grass protection layer 30 in which the gap is compressed.
さらに、吸出防止層２０及び防草層３０の界面が溶着されることにより、吸出防止層２０及び防草層３０を長期に亘って一体化することができる。 Furthermore, by welding the interface between the suction preventing layer 20 and the grass layer 30, the suction preventing layer 20 and the grass layer 30 can be integrated over a long period of time.
なお、本発明は、本発明の精神を逸脱しない限り種々の改変をなすことができ、そして、本発明が該改変されたものにも及ぶことは当然である。 The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to those modified as well.
上述した実施形態に係る製造方法では、ニードルパンチで高融点繊維層と低融点繊維層とを絡ませた場合を例に説明したが、これに限定されるものではない。 Although the case where the high melting fiber layer and the low melting fiber layer are entangled by needle punching has been described as an example in the manufacturing method according to the embodiment described above, the invention is not limited thereto.
また、高融点繊維の融点及び低融点繊維の融点は、上述した数値に限定されるものではない。 Further, the melting point of the high melting point fiber and the melting point of the low melting point fiber are not limited to the above-mentioned values.
１０・・・ 吸出防止シート
２０・・・ 吸出防止層
３０・・・ 防草層
４０・・・ 補強基布
10 · · · Suction prevention sheet 20 · · · Suction prevention layer 30 · · · Grass layer 40 · · · Reinforcement base
Claims (8)
フェルト状の吸出防止層と、
前記吸出防止層上に積層されるとともに前記吸出防止層と一体化された防草層と、
を備えていることを特徴とする吸出防止シート。 It is a suction prevention sheet installed on the revetment,
Felt-like anti-suction layer,
A grass layer laminated on the suction prevention layer and integrated with the suction prevention layer;
An anti-suction sheet comprising:
前記防草層は、前記高融点繊維より融点が低い低融点繊維を溶融して成ることを特徴とする請求項１記載の吸出防止シート。 The absorption prevention layer is formed by laminating high melting point fibers,
The anti-suction sheet according to claim 1, wherein the grass layer is formed by melting a low melting point fiber having a melting point lower than that of the high melting point fiber.
第１の繊維を積層して成る第１の繊維層を形成する工程と、
第２の繊維を積層して成る第２の繊維層を前記第１の繊維層上に形成する工程と、
前記第１の繊維層を圧縮してフェルト状の吸出防止層を形成する工程と、
前記第２の繊維層を圧縮して前記吸出防止層と一体化された防草層を形成する工程と、
を含むことを特徴とする吸出防止シートの製造方法。 It is a manufacturing method of a suction prevention sheet installed in a revetment,
Forming a first fiber layer formed by laminating the first fibers;
Forming a second fiber layer formed by laminating a second fiber on the first fiber layer;
Compressing the first fiber layer to form a felt-like anti-suction layer;
Compressing the second fiber layer to form a grass layer integrated with the anti-suction layer;
A method of producing a suction prevention sheet, comprising
前記第２の繊維は、前記高融点繊維より融点が低い低融点繊維であることを特徴とする請求項５記載の吸出防止シートの製造方法。 The first fiber is a high melting point fiber,
The method according to claim 5, wherein the second fiber is a low melting fiber having a melting point lower than that of the high melting fiber.
The method according to claim 6 or 7, wherein the low melting point fiber is heated to a temperature lower than the melting point of the high melting point fiber.
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