JP6533732B2 - Grass protection board and method of using the same - Google Patents
Grass protection board and method of using the same Download PDFInfo
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- JP6533732B2 JP6533732B2 JP2015203918A JP2015203918A JP6533732B2 JP 6533732 B2 JP6533732 B2 JP 6533732B2 JP 2015203918 A JP2015203918 A JP 2015203918A JP 2015203918 A JP2015203918 A JP 2015203918A JP 6533732 B2 JP6533732 B2 JP 6533732B2
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- woven fabric
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Landscapes
- Protection Of Plants (AREA)
- Catching Or Destruction (AREA)
Description
本発明は、地面（特に、設置された太陽光パネルの裏側の地面など）に雑草などの植物が生育するのを抑制するための防草ボード及びその使用方法に関する。 The present invention relates to a grass protection board for suppressing the growth of plants such as weeds on the ground (in particular, the ground behind a solar panel installed, etc.) and a method of using the same.
最近のクリーンエネルギーの需要増加や遊休地の活用促進などの条件が重なり、大規模太陽光発電、いわゆるメガソーラーが増加している。メガソーラーでは、基本的には、地面にコンクリート基礎を打設し、このコンクリート基礎の上に、架台を介して太陽光パネルを施工するが、前記コンクリート基礎は、コストの観点から、架台を支えるための一部の領域のみに打設される。そのため、施工された太陽光パネルの裏側では、コンクリート基礎及び架台により空間部が形成されており、太陽光パネルの周縁部（通常、長方形状の太陽光パネルにおける長尺方向に平行な一対の端部）を除く殆どの領域において地面が露出している。さらに、コンクリート基礎及び架台は、ある程度の高さを有しているため、太陽光パネルの裏側にも太陽光が入射し、地面に雑草が繁殖する。しかし、太陽光パネルの裏側の地面に雑草が繁殖すると、前記空間部が狭いため、除草作業が困難となる。また、パネルの隙間から雑草が伸長し、パネル表面を覆うと、発電効率が低下する。 Conditions such as the recent increase in demand for clean energy and promotion of utilization of idle land are combined, and large-scale solar power generation, so-called mega solar, is increasing. In mega solar, basically, a concrete foundation is placed on the ground, and a solar panel is installed on the concrete foundation via a pedestal, but the concrete foundation supports the pedestal from the viewpoint of cost It is placed in only a part of the area. Therefore, on the back side of the constructed solar panel, a space is formed by the concrete foundation and the frame, and the peripheral portion of the solar panel (usually, a pair of ends parallel to the long direction in the rectangular solar panel The ground is exposed in most areas except the Furthermore, since the concrete foundation and the mount have a certain height, sunlight is also incident on the back side of the solar panel, and weeds propagate on the ground. However, if weeds propagate on the ground behind the solar panel, the space is narrow, which makes it difficult to perform weeding work. In addition, if weeds extend from the gaps in the panel and the surface of the panel is covered, the power generation efficiency decreases.
一方、防草シートとしては、防草目的の農業用シートが知られているが、コストや施工性などの点から、面密度が小さい防草シートが使用されており、風などによる飛散防止のために多くの留め具（固定具）により固定して使用されている。具体的には、防草シートをピンなどの留め具を用いてシートを貫通させることにより地面に固定する方法が一般的である。しかし、前述のように、太陽光パネル裏側では、空間部が狭いため、防草シートの敷設作業が困難であり、留め具による固定作業はさらに困難である。 On the other hand, although a sheet for agriculture for the purpose of grass protection is known as a grass protection sheet, a grass protection sheet having a low surface density is used from the viewpoint of cost and construction, etc. For this purpose, it is used by being fixed by many fasteners (fixers). Specifically, a method of fixing a grass protection sheet to the ground by penetrating the sheet using a fastener such as a pin is generally used. However, as described above, since the space is narrow on the back side of the solar panel, the laying operation of the grass protection sheet is difficult, and the fixing operation by the fastener is more difficult.
特開平１０−１６８７３０号公報（特許文献１）には、防砂用シートや防草用シートとして有用なシートとして、不織布の少なくとも表面にアスファルトを含有し、かつＪＩＳ Ｌ−１０９６の定速伸張形法に基づいた貫通抵抗力が８０ｋｇｆ以上である透水性不織布シートが開示されている。この文献の実施例では、ポリエステル長繊維からなるニードルパンチ不織布に、繊維重量に対して２０％（６０ｇ／ｍ２）のカチオン系アスファルト乳剤を含浸させている。 In JP-A-10-168730 (patent document 1), as a sheet useful as a sandproof sheet or a grass proofing sheet, asphalt is contained on at least the surface of a non-woven fabric, and a constant speed stretching method according to JIS L-1096 And a water-permeable nonwoven sheet having a penetration resistance of 80 kgf or more. In the example of this document, a needle punched non-woven fabric made of polyester long fibers is impregnated with 20% (60 g / m 2 ) of a cationic asphalt emulsion based on the fiber weight.
しかし、このシートでは、前述のように、面密度が小さいため、飛散を防止するためには、留め具での固定が必要である。また、このシートは、通水性を有するため、地面からの水蒸気により恒常的に保水されるためか、シートの表面で雑草が生育する。さらに、アスファルトが表面に位置するため、耐久性が低く、例えば３年以上使用すると、防草性が低下し易い。 However, in this sheet, as described above, since the areal density is low, in order to prevent scattering, fixing with fasteners is necessary. Also, because this sheet has water permeability, weeds grow on the surface of the sheet, probably because water is constantly retained by water vapor from the ground. Furthermore, since the asphalt is located on the surface, the durability is low. For example, when used for 3 years or more, the grass resistance tends to be reduced.
特開２００９−１３８４８６号公報（特許文献２）には、遮光性、耐候性、機械的特性、不透水性、貫通防止性に優れた防草シートとして、両面が改質アスファルトで被覆された不織布などの基材層に対して、無機質粒子又は無機質粒子を含有する合成樹脂を含む表面層と、合成樹脂又は無機質粒子を含有する剛性樹脂を含む裏面層とを備えた防草シートが開示されている。この文献の実施例では、改質アスファルト中を通過させることにより、不織布−スクリム−不織布の三層構造を有する複合不織布の両面に改質アスファルト層を形成した後、表面層として、５００〜１０００ｇ／ｍ２の範囲で扁平状のスレートチップを付着させ、裏面層として、二軸延伸ポリプロピレンシートを貼り合わせ、厚み３〜４．５ｍｍの防草シートを製造している。 JP 2009-138486 A (patent document 2) is a non-woven fabric coated on both sides with modified asphalt as a grass protection sheet excellent in light shielding, weather resistance, mechanical properties, water impermeability and penetration prevention. And a back layer comprising a surface layer containing inorganic particles or a synthetic resin containing inorganic particles, and a back layer containing a rigid resin containing the synthetic resin or inorganic particles, for a substrate layer such as There is. In the examples of this document, after forming the modified asphalt layer on both sides of the composite nonwoven fabric having a non-woven fabric / scrimb-non-woven fabric three-layer structure by passing through the modified asphalt, as a surface layer, A flat slate chip is attached in the range of m 2 , and a biaxially stretched polypropylene sheet is laminated as a back surface layer to manufacture a 3- to 4.5-mm-thick grass-proof sheet.
しかし、この防草シートは、層構造が複雑で生産性が低い。また、この文献には、シートの飛散性を抑制することや、改質アスファルト層の面密度や厚みも記載されておらず、薄肉のシートであるため、飛散し易い。さらに、この防草シートでは、表面が平滑であるため、地面に比べて保水性が低く、太陽光パネル裏面の空間部の温度が上昇し易く、太陽光パネルの発電効率を低下させる。 However, this grass protection sheet has a complicated layer structure and low productivity. Further, in this document, the scattering property of the sheet is not suppressed, and the surface density and thickness of the modified asphalt layer are not described, and since the sheet is a thin sheet, it is easily scattered. Furthermore, since this grass protection sheet has a smooth surface, it has low water retention compared to the ground, and the temperature of the space in the back of the solar panel is likely to rise, which lowers the power generation efficiency of the solar panel.
なお、これらの文献には、具体的な施工方法は記載されていないが、前述のように、汎用の方法を用いて留め具で固定すると、留め具とシートとの隙間から雑草が生育する。 In addition, although a concrete construction method is not described in these documents, as mentioned above, when it fixes with a fastener using a general purpose method, weed grows from the clearance gap between a fastener and a sheet | seat.
従って、本発明の目的は、簡便な構造で雑草などの植物の生育を抑制できるとともに、留め具を用いることなく、風などによる飛散も抑制できる防草ボード及びその使用方法を提供することにある。 Therefore, an object of the present invention is to provide a grass protection board capable of suppressing the growth of plants such as weeds with a simple structure, and suppressing scattering due to wind without using fasteners, and a method of using the same. .
本発明の他の目的は、長期間紫外線に照射されても劣化を抑制でき、耐久性に優れた防草ボード及びその使用方法を提供することにある。 Another object of the present invention is to provide a grass board excellent in durability, which can suppress deterioration even when irradiated with ultraviolet rays for a long time, and a method of using the same.
本発明のさらに他の目的は、太陽光パネル裏面と地面との間などの狭い空間部であっても、容易に施工でき、かつ太陽光パネルの発電効率の低下も抑制できる防草ボード及びその使用方法を提供することにある。 Still another object of the present invention is a grass protection board which can be easily installed even in a narrow space such as between the back of a solar panel and the ground, and which can suppress a decrease in the power generation efficiency of the solar panel It is about providing the usage method.
本発明の別の目的は、適度な柔軟性を有し、地面の凹凸形状にも追随できるとともに、容易に切断加工でき、現場での施工にも優れる防草ボード及びその使用方法を提供することにある。 Another object of the present invention is to provide an anti-grass board which has appropriate flexibility, can follow the uneven shape of the ground, can be easily cut and is excellent in on-site application, and a method of using the same. It is in.
本発明のさらに別の目的は、複数のボードを並べて敷設しても、隣接するシート間から植物が生育するのを抑制できる防草ボードの使用方法を提供することにある。 Still another object of the present invention is to provide a method of using a grass protection board which can suppress the growth of plants from between adjacent sheets even if a plurality of boards are laid side by side.
本発明者らは、前記課題を達成するため鋭意検討した結果、アスファルトを含み、かつ面密度４ｋｇ／ｍ２以上の遮水遮光層の表面側に、目付４５０ｇ／ｍ２以下の不織布及び／又は遮光粒子を含む紫外線防止層を積層することにより、簡便な構造で雑草などの植物の生育を抑制できるとともに、留め具を用いることなく、風などによる飛散も抑制できることを見いだし、本発明を完成した。 The present inventors have made intensive studies to achieve the above objects, it comprises asphalt, and the surface side of the surface density 4 kg / m 2 or more impermeable light shielding layer, basis weight 450 g / m 2 or less of the nonwoven fabric and / or By laminating an ultraviolet light prevention layer containing light shielding particles, it was found that growth of plants such as weeds can be suppressed with a simple structure, and scattering by wind etc. can be suppressed without using fasteners, and the present invention was completed. .
すなわち、本発明の防草ボードは、植物の生育を抑制するための防草ボードであって、アスファルトを含み、かつ面密度４ｋｇ／ｍ２以上の遮水遮光層と、この遮水遮光層に対して表面側に積層される紫外線防止層とを含む防草ボードであって、前記紫外線防止層が、目付４５０ｇ／ｍ２以下の不織布及び／又は遮光粒子を含む。前記アスファルトの割合は遮水遮光層全体に対して３０質量％以下であってもよい。前記不織布の見掛密度は０．０４〜０．１ｇ／ｃｍ３程度であってもよい。前記不織布はポリエステル繊維を含む短繊維不織布であってもよい。本発明の防草ボードは、曲げ強度が１０００〜１５００ＭＰａ程度であってもよい。本発明の防草ボードは、前記遮水遮光層に対して地面と接触する側に積層される保護層をさらに含んでいてもよい。本発明の防草ボードは、太陽光パネルの裏面の地面に敷設するための防草ボードであってもよい。 That is, the grass protection board of the present invention is a grass protection board for suppressing the growth of plants, which comprises asphalt and a water shielding and light shielding layer having an areal density of 4 kg / m 2 or more, and the water shielding and light shielding layer. And a UV protection layer laminated on the surface side, wherein the UV protection layer includes a nonwoven fabric with a basis weight of 450 g / m 2 or less and / or a light shielding particle. The proportion of the asphalt may be 30% by mass or less with respect to the entire impermeable and light shielding layer. The apparent density of the non-woven fabric may be about 0.04 to 0.1 g / cm 3 . The non-woven fabric may be a staple non-woven fabric containing polyester fibers. The grass protection board of the present invention may have a bending strength of about 1000 to 1500 MPa. The grass protection board of the present invention may further include a protective layer laminated on the side of the water blocking / light shielding layer in contact with the ground. The grass protection board of the present invention may be a grass protection board for laying on the ground of the back of a solar panel.
本発明には、前記防草ボードを地面に敷設して植物の生育を抑制する防草ボードの使用方法も含まれる。本発明の使用方法において、複数の防草ボードを並べて敷設し、かつ隣接する防草ボードの境界に沿って、境界をカバーするように、防草ボードと地面との間に、遮光シートを介在させてもよい。本発明の使用方法では、設置された太陽光パネルの裏側の地面に防草ボードを敷設してもよい。 The present invention also includes a method of using the grass board, which lays the grass board on the ground to suppress the growth of plants. In the method of use of the present invention, a plurality of grass protection boards are laid side by side, and a light shielding sheet is interposed between the grass protection board and the ground so as to cover the boundary along the boundaries of the adjacent grass protection boards. You may In the method of use of the present invention, a grass board may be laid on the ground behind the installed solar panel.
本発明では、アスファルトを含み、かつ面密度４ｋｇ／ｍ２以上の遮水遮光層の表面側に、目付４５０ｇ／ｍ２以下の不織布及び／又は遮光粒子を含む紫外線防止層が積層されているため、簡便な構造で雑草などの植物の生育を抑制できるとともに、留め具を用いることなく、風などによる飛散も抑制できる。また、紫外線防止層が短繊維不織布及び／又は遮光粒子を含むと、長期間紫外線に照射されても劣化を抑制でき、耐久性を向上できる。さらに、留め具などが不要であるため、太陽光パネル裏面と地面との間などの狭い空間部であっても、容易に施工できる。特に、前記紫外線防止層が目付１００〜５００ｇ／ｍ２の不織布（特に短繊維不織布）を含むと、雑草などの植物の生育を抑制しつつ、ある程度の水分も保持でき、前記空間部の温度上昇も抑制できるため、温度上昇による太陽光パネルの発電効率の低下も抑制できる。さらに、適度な柔軟性を有し、地面の凹凸形状にも追随できるとともに、容易に切断加工でき、現場での施工も向上できる。また、複数の防草ボードを並べて敷設し、かつ隣接する防草ボードの境界に沿って、境界をカバーするように、防草ボードと地面との間に、遮光シートを介在させると、隣接するシート間から植物が生育するのを抑制できる。 In the present invention, since the non-woven fabric having a basis weight of 450 g / m 2 or less and / or the ultraviolet light prevention layer including light shielding particles is laminated on the surface side of the water blocking light shielding layer containing asphalt and having a surface density of 4 kg / m 2 or more. It is possible to suppress the growth of plants such as weeds with a simple structure, and also to suppress scattering due to wind or the like without using fasteners. In addition, when the ultraviolet ray prevention layer contains a short fiber non-woven fabric and / or light shielding particles, deterioration can be suppressed even when irradiated with ultraviolet rays for a long time, and the durability can be improved. Furthermore, since a fastener etc. are unnecessary, even in a narrow space such as between the solar panel back surface and the ground, construction can be easily performed. In particular, when the UV blocking layer contains a non-woven fabric (in particular, a short fiber non-woven fabric) having a basis weight of 100 to 500 g / m 2 , it can hold some moisture while suppressing the growth of plants such as weeds. Because of this, it is also possible to suppress the decrease in the power generation efficiency of the solar panel due to the temperature rise. Furthermore, it has appropriate flexibility, can follow the uneven shape of the ground, can be easily cut and processed, and can also improve on-site construction. In addition, a plurality of grass boards are laid side by side, and a light shielding sheet is interposed between the grass boards and the ground so as to cover the boundaries along the boundaries of the adjacent grass boards. It is possible to suppress the growth of plants from between the sheets.
［遮水遮光層］
本発明の防草ボードは遮水遮光層を含み、この遮水遮光層は、アスファルトを含み、高い面密度を有するため、遮水遮光性に優れ、紫外線防止層などの他の層との密着性に優れる上に、重量が大きく、風などによる飛散も抑制できるため、留め具などを用いることなく、容易に施工できる。遮水遮光層の面密度は４ｋｇ／ｍ２以上であり、例えば４〜３０ｋｇ／ｍ２、好ましくは５〜２５ｋｇ／ｍ２、さらに好ましくは６〜２０ｋｇ／ｍ２（特に８〜１５ｋｇ／ｍ２）程度である。面密度が小さすぎると、遮水遮光性が低下するとともに、風などにより飛散し易くなる。
[Water impermeable and light shielding layer]
The grass protection board of the present invention includes a water blocking light-shielding layer, which contains asphalt and has a high surface density, so it is excellent in water blocking and light-shielding properties and adheres to other layers such as an ultraviolet light blocking layer. In addition to excellent properties, it can be easily installed without using fasteners and the like because it is large in weight and can suppress scattering due to wind or the like. The areal density of the water barrier shielding layer has a 4 kg / m 2 or more, for example 4~30kg / m 2, preferably 5~25kg / m 2, more preferably 6~20kg / m 2 (particularly 8~15kg / m 2 ) Degree. When the surface density is too small, the water blocking property is lowered and the sheet is easily scattered by wind or the like.
アスファルトとしては、例えば、天然アスファルト（レイクアスファルト、ロックアスファルト、オイルサンド、アスファルトタイトなど）、石油アスファルト（ストレートアスファルト、ブローンアスファルトなど）などが挙げられる。これらのアスファルトは、単独で又は二種以上組み合わせて使用できる。これらのうち、ストレートアスファルトなどの石油アスファルトなどが汎用される。 As asphalt, for example, natural asphalt (lake asphalt, rock asphalt, oil sand, asphalt tight, etc.), petroleum asphalt (straight asphalt, blown asphalt, etc.) and the like can be mentioned. These asphalts can be used alone or in combination of two or more. Among these, petroleum asphalt such as straight asphalt is generally used.
アスファルトの針入度（１／１０ｍｍ）は、ＪＩＳ Ｋ２２０７−１９９６に準拠した方法において、０〜３００程度の範囲から選択でき、例えば５〜２００、好ましくは１０〜１５０、さらに好ましくは３０〜１００（特に５０〜９０）程度であってもよい。針入度が小さすぎると、遮水遮光層の柔軟性が低下して不均一な地面に対する追随性が低下し易い。一方、針入度が大きすぎると、紫外線防止層に対する接着性が低下する虞がある。 The penetration of asphalt (1/10 mm) can be selected from the range of about 0 to 300, for example, 5 to 200, preferably 10 to 150, and more preferably 30 to 100 in the method according to JIS K 2207-1996. In particular, it may be about 50 to 90). If the penetration degree is too small, the flexibility of the water blocking / light shielding layer is reduced, and the followability to uneven ground tends to be reduced. On the other hand, when the penetration degree is too large, there is a possibility that the adhesiveness to the ultraviolet ray prevention layer may be lowered.
アスファルトは、改質剤と組み合わせることにより、改質アスファルトとして使用してもよい。改質剤には、有機系改質剤、無機系改質剤が含まれる。 Asphalt may be used as a modified asphalt by combining it with a modifier. The modifiers include organic modifiers and inorganic modifiers.
有機系改質剤としては、例えば、ポリオレフィン、ビニル系重合体（ポリ塩化ビニル、ポリ酢酸ビニル、エチレン−酢酸ビニル共重合体、エチレン−ビニルアルコール共重合体、エチレン−アクリル酸共重合体、エチレン−アクリル酸メチル共重合体、エチレン−アクリル酸エチル共重合体など）、ポリアミド、ポリエステル、合成ゴム又はエラストマー（ポリブタジエン、ポリイソプレン、スチレン−ブタジエン共重合体など）、天然ゴム、ロジン系樹脂（天然ロジン、変性ロジンなど）などが挙げられる。これらの有機系改質剤は、単独で又は二種以上組み合わせて使用できる。これらの有機系改質剤のうち、熱可塑性エラストマー、特に、スチレン−ブタジエン−スチレンブロック共重合体などのスチレン−ジエン系共重合体が好ましい。 Examples of organic modifiers include polyolefins, vinyl polymers (polyvinyl chloride, polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-acrylic acid copolymer, ethylene -Methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, etc., polyamide, polyester, synthetic rubber or elastomer (polybutadiene, polyisoprene, styrene-butadiene copolymer, etc.), natural rubber, rosin based resin (natural And rosin, modified rosin, etc. These organic modifiers can be used alone or in combination of two or more. Among these organic modifiers, thermoplastic elastomers, in particular, styrene-diene copolymers such as styrene-butadiene-styrene block copolymers are preferred.
無機系改質剤としては、例えば、鉄、銅、錫、亜鉛、ニッケル、ステンレス鋼などの金属粒子（粉末）；酸化鉄、三二酸化鉄、四三酸化鉄、フェライト、酸化錫、酸化亜鉛、亜鉛華、酸化銅、酸化アルミニウムなどの金属酸化物粒子；硫酸バリウム、硫酸カルシウム、硫酸アルミニウム、亜硫酸カルシウム、炭酸カルシウム、重炭酸カルシウム、炭酸バリウム、水酸化マグネシウムなどの金属塩粒子；製鋼スラグ、マイカ、クレー、タルク、ウォラストナイト、けい藻土、乾燥砂、けい砂、軽石粉などの鉱物粒子；ガラス繊維や炭素繊維などの無機繊維などが挙げられる。これらの無機系改質剤は、単独で又は二種以上組み合わせて使用できる。これらの無機系改質剤のうち、鉄粒子、各種酸化鉄粒子、製鋼スラグ粒子、（重）炭酸カルシウム粒子、乾燥砂などの粒子状改質剤が好ましい。粒子状改質剤の平均粒径は０．０１〜０．５ｍｍ（特に０．０５〜０．２ｍｍ）程度である。 Examples of inorganic modifiers include metal particles (powder) such as iron, copper, tin, zinc, nickel and stainless steel; iron oxide, ferric oxide, ferric oxide, ferrite, tin oxide, zinc oxide, Metal oxide particles such as zinc oxide, copper oxide and aluminum oxide; barium sulfate, calcium sulfate, aluminum sulfate, calcium sulfite, calcium carbonate, calcium bicarbonate, calcium carbonate, barium carbonate, magnesium hydroxide and other metal salt particles; steelmaking slag, mica And mineral particles such as clay, talc, wollastonite, diatomaceous earth, dried sand, silica sand and pumice powder; and inorganic fibers such as glass fibers and carbon fibers. These inorganic modifiers can be used alone or in combination of two or more. Among these inorganic modifiers, particulate modifiers such as iron particles, various iron oxide particles, steelmaking slag particles, calcium (bi) carbonate particles and dry sand are preferable. The average particle diameter of the particulate modifier is about 0.01 to 0.5 mm (particularly 0.05 to 0.2 mm).
有機系改質剤と無機系改質剤とは、接着性及び遮水遮光性を向上させるために、両者を組み合わせて用いてもよい。本発明では、面密度を向上できる点から、少なくとも無機系改質剤を含むのが好ましい。 The organic modifier and the inorganic modifier may be used in combination in order to improve the adhesion and the water blocking property. In the present invention, it is preferable to include at least an inorganic modifier from the viewpoint of being able to improve the areal density.
遮水遮光層は、さらに慣用の添加剤、例えば、植物忌避剤（防根剤）、安定剤（耐光安定剤、耐熱安定剤など）、難燃剤、帯電防止剤、界面活性剤、可塑剤、発泡剤、消泡剤、防虫剤（防蟻剤など）、防腐剤（防カビ剤、抗菌剤など）などを含んでいてもよい。 The water blocking / light shielding layer further contains conventional additives, for example, plant repellents (root inhibitors), stabilizers (such as light stabilizers and heat stabilizers), flame retardants, antistatic agents, surfactants, plasticizers, It may contain a foaming agent, an antifoaming agent, an insect repellent (such as an anticide), a preservative (such as an antifungal agent or an antibacterial agent), and the like.
アスファルトの割合は、遮水遮光層全体に対して３０質量％以下であってもよく、例えば５〜３０質量％、好ましくは１０〜２８質量％、さらに好ましくは１５〜２５質量％程度である。アスファルトと改質剤との質量割合は、例えば、アスファルト／改質剤＝３０／７０〜５／９５、好ましくは２８／７２〜１０／９０、さらに好ましくは２５／７５〜１５／８５程度である。アスファルトの割合が多すぎると、面密度が低下する虞があり、改質剤（特に無機系改質剤）の割合が多すぎると、紫外線防止層などの他の層との密着性が低下する虞がある。 The proportion of asphalt may be 30% by mass or less, for example, 5 to 30% by mass, preferably 10 to 28% by mass, and more preferably about 15 to 25% by mass with respect to the whole water blocking layer. The mass ratio of asphalt to the modifier is, for example, asphalt / modifier = 30/70 to 5/95, preferably 28/72 to 10/90, more preferably about 25/75 to 15/85. . If the proportion of asphalt is too high, there is a possibility that the surface density may decrease, and if the proportion of modifier (especially, inorganic modifier) is too high, the adhesion to other layers such as an ultraviolet ray prevention layer may be reduced. There is a risk.
遮水遮光層の平均厚みは３ｍｍ以上であってもよく、例えば３〜３０ｍｍ、好ましくは４〜２０ｍｍ、さらに好ましくは５〜１５ｍｍ（特に６〜１０ｍｍ）程度である。遮水遮光層の厚みが薄すぎると、遮光能及び遮水能が低下する上に、風などにより飛散する虞がある。 The average thickness of the water blocking / light shielding layer may be 3 mm or more, and is, for example, about 3 to 30 mm, preferably 4 to 20 mm, and more preferably 5 to 15 mm (particularly 6 to 10 mm). When the thickness of the water blocking light-shielding layer is too thin, the light blocking ability and the water blocking ability may be reduced, and furthermore, there is a possibility of scattering by wind or the like.
［紫外線防止層］
紫外線防止層は、前記遮水遮光層に対して表面側に積層され、通常、前記遮水遮光層の上に積層される。紫外線防止層は、紫外線を吸収又は反射することにより遮水遮光層が劣化するのを抑制できればよく、特に限定されず、金属板などの無機材質で形成された層であってもよいが、柔軟性や生産性などに優れる点から、不織布及び／又は遮光粒子を含むのが好ましい。
[UV ray prevention layer]
The ultraviolet protection layer is laminated on the surface side with respect to the water blocking layer, and is usually stacked on the water blocking layer. The ultraviolet ray prevention layer is not particularly limited as long as it can suppress deterioration of the water blocking and light shielding layer by absorbing or reflecting ultraviolet rays, and may be a layer formed of an inorganic material such as a metal plate, but is flexible Non-woven fabric and / or light-shielding particles are preferably included from the viewpoint of excellent in properties and productivity.
不織布は、有機繊維、無機繊維のいずれの繊維で形成されていてもよい。 The non-woven fabric may be formed of any of organic fibers and inorganic fibers.
有機繊維としては、例えば、天然繊維（綿、カボック、麻などのセルロース繊維、羊毛や絹などのタンパク繊維など）、再生繊維（レーヨン、ポリノジック、キュプラ、リヨセルなど）、半合成繊維（トリアセテート繊維などのアセテート繊維など）、合成繊維［ポリオレフィン繊維（ポリエチレン系繊維、ポリプロピレン系繊維など）、スチレン系繊維、アクリル繊維、ビニルアルコール系繊維（エチレンビニルアルコール系繊維など）、ポリ塩化ビニル系繊維、フッ素繊維（ポリテトラフルオロエチレン系繊維など）、ポリエステル繊維（ポリエチレンテレフタレート、ポリエチレンナフタレートなどのポリＣ２−４アルキレンアリレート繊維、液晶ポリエステル繊維などの全芳香族ポリエステル繊維など）、ポリアミド繊維（ポリアミド６、ポリアミド６６などの脂肪族ポリアミド繊維、アラミド繊維などの全芳香族ポリアミド繊維など）、ポリウレタン繊維、ポリアセタール繊維、ベンゾエート繊維、ポリフェニレンスルフィド繊維、複素環高分子繊維など］などが挙げられる。これらの有機繊維は、単独で又は二種以上組み合わせて使用できる。 Examples of organic fibers include natural fibers (cellulose fibers such as cotton, kabok and hemp, protein fibers such as wool and silk), regenerated fibers (rayon, polynozic, cupra, lyocell, etc.), semi-synthetic fibers (triacetate fiber, etc.) Acetate fiber, synthetic fiber [polyolefin fiber (polyethylene fiber, polypropylene fiber, etc.), styrenic fiber, acrylic fiber, vinyl alcohol fiber (ethylene vinyl alcohol fiber, etc.), polyvinyl chloride fiber, fluorine fiber (Polytetrafluoroethylene-based fibers, etc.), Polyester fibers (Poly C 2-4 alkylene arylate fibers such as polyethylene terephthalate and polyethylene naphthalate, Fully aromatic polyester fibers such as liquid-crystalline polyester fibers, etc.) Polyamide fibers (Polyamide 6, aliphatic polyamide fibers such as polyamide 66, wholly aromatic polyamide fibers such as aramid fibers, polyurethane fibers, polyacetal fibers, benzoate fibers, polyphenylene sulfide fibers, heterocyclic polymer fibers, etc.]. These organic fibers can be used alone or in combination of two or more.
無機繊維としては、例えば、ガラス繊維、炭素繊維、活性炭素繊維、アルミナ繊維、炭化ケイ素繊維、ボロン繊維、チラノ繊維、金属繊維（金繊維、銀繊維、銅繊維、スチール繊維、アルミニウム繊維、ステンレススチール繊維など）などが挙げられる。これらの無機繊維は、単独で又は二種以上組み合わせて使用できる。 As an inorganic fiber, for example, glass fiber, carbon fiber, activated carbon fiber, alumina fiber, silicon carbide fiber, boron fiber, tyranno fiber, metal fiber (gold fiber, silver fiber, copper fiber, steel fiber, aluminum fiber, stainless steel) And the like. These inorganic fibers can be used alone or in combination of two or more.
さらに、有機繊維と無機繊維とを組み合わせてもよい。これらの繊維のうち、柔軟性などに優れる点から、有機繊維が好ましく、ポリオレフィン繊維、ポリエステル繊維、ポリアミド繊維などの合成繊維などが汎用され、親水性や機械的特性、耐久性などの点から、ポリエチレンテレフタレート繊維などのポリエステル繊維が特に好ましい。 Furthermore, organic fibers and inorganic fibers may be combined. Among these fibers, organic fibers are preferable from the viewpoint of excellent flexibility and the like, and synthetic fibers such as polyolefin fibers, polyester fibers, and polyamide fibers are generally used, and from the viewpoint of hydrophilicity, mechanical properties, durability, etc. Polyester fibers such as polyethylene terephthalate fibers are particularly preferred.
不織布を構成する繊維は、繊維の種類に応じて、紡績糸、モノフィラメント、マルチフィラメントなどであってもよく、その横断面形状（マルチフィラメントの場合、モノフィラメントの断面形状）は、一般的な中実断面形状である丸型断面や異型断面［偏平状、楕円状、多角形状、３〜１４葉状、Ｔ字状、Ｈ字状、Ｖ字状、ドッグボーン（Ｉ字状）など］に限定されず、中空断面状などであってもよいが、通常、丸型断面である。なお、短繊維は、通常、紡績糸やモノフィラメントのカット糸である。 The fibers constituting the non-woven fabric may be spun yarns, monofilaments, multifilaments, etc. according to the type of fibers, and the cross-sectional shape (in the case of multifilaments, the cross-sectional shape of monofilaments) is generally solid. The cross sectional shape is not limited to a round cross section or atypical cross section [flat, elliptical, polygonal, 3 to 14 leaves, T, H, V, dog bone (I), etc.] Although it may have a hollow cross section, it is usually a round cross section. The staple fibers are usually spun yarns or cut yarns of monofilaments.
繊維の平均繊度は、例えば０．１〜２０ｄｔｅｘ、好ましくは０．３〜１０ｄｔｅｘ、さらに好ましくは０．５〜５ｄｔｅｘ程度であってもよい。繊度が小さすぎると、保水能が低下する虞があり、大きすぎると、繊維間の隙間が大きくなり、紫外線防止効果が低下するとともに、水分を吸収した紫外線防止層に植物が生育する虞がある。 The average fineness of the fibers may be, for example, about 0.1 to 20 dtex, preferably about 0.3 to 10 dtex, and more preferably about 0.5 to 5 dtex. If the fineness is too small, there is a risk that the water holding ability may decrease. If the fineness is too large, the gaps between the fibers will be large, and the ultraviolet ray prevention effect will be reduced, and plants may grow in the ultraviolet ray prevention layer that absorbed water. .
繊維は、１５０ｍｍを超える長繊維（例えば、無限長の長繊維）であってもよいが、低目付で均一な密度や厚みを調整し易い点から、短繊維が好ましい。短繊維の平均繊維長は１５０ｍｍ以下程度であればよく、例えば、１０〜１５０ｍｍ、好ましくは１５〜１００ｍｍ（例えば、２０〜８０ｍｍ）、さらに好ましくは２５〜７０ｍｍ（特に３０〜６０ｍｍ）程度である。短繊維の繊維長が長すぎると、保水能や柔軟性が低下するとともに、低目付で均一な密度や厚みを調整し難くなる虞があり、短すぎると、形態安定性が低下する虞がある。 The fibers may be long fibers exceeding 150 mm (for example, long fibers having an infinite length), but short fibers are preferable in terms of easy adjustment of low density and uniform density and thickness. The average fiber length of the short fibers may be about 150 mm or less, for example, about 10 to 150 mm, preferably about 15 to 100 mm (e.g., about 20 to 80 mm), and more preferably about 25 to 70 mm (particularly about 30 to 60 mm). If the fiber length of the short fibers is too long, the water holding capacity and the flexibility may be lowered, and it may be difficult to adjust the uniform density or thickness with a low basis weight, and if too short, the form stability may be deteriorated. .
不織布の目付は４５０ｇ／ｍ２以下であり、例えば１００〜４５０ｇ／ｍ２（例えば１２０〜４２０ｇ／ｍ２）、好ましくは１５０〜４００ｇ／ｍ２（例えば２００〜３９０ｇ／ｍ２）、さらに好ましくは２５０〜３８０ｇ／ｍ２（特に３００〜３６０ｇ／ｍ２）程度である。目付が大きすぎると、風により飛散した土壌を保持し易く、水の保水力も大きすぎるためか、防草性が低下する。なお、目付が小さすぎると、紫外線防止効果が低下すると共に、保水能も低下する虞がある。 Basis weight of the nonwoven fabric had a 450 g / m 2 or less, for example 100~450g / m 2 (e.g. 120~420g / m 2), preferably 150 and 400 / m 2 (e.g. 200~390g / m 2), more preferably It is about 250-380 g / m < 2 > (especially 300-360 g / m < 2 >). If the fabric weight is too large, it is easy to keep the soil scattered by the wind, and the water retentivity may be too large, thereby reducing the grass protection. In addition, when a fabric weight is too small, while an ultraviolet-ray prevention effect falls, there exists a possibility that a water holding capacity may also fall.
不織布の見掛密度は、例えば０．０４〜０．１ｇ／ｃｍ３、好ましくは０．０５〜０．０９ｇ／ｃｍ３、さらに好ましくは０．０６〜０．０８ｇ／ｃｍ３程度である。密度が大きすぎると、紫外線防止効果が低下するとともに、保水能及び軽量性が低下する虞がある。一方、密度が小さすぎても、紫外線防止効果が低下するとともに、保水能が低下する虞がある。 The apparent density of the non-woven fabric is, for example, about 0.04 to 0.1 g / cm 3 , preferably about 0.05 to 0.09 g / cm 3 , and more preferably about 0.06 to 0.08 g / cm 3 . When the density is too large, the ultraviolet ray preventing effect may be lowered, and the water holding ability and the lightness may be lowered. On the other hand, if the density is too small, the ultraviolet light prevention effect may be reduced and the water retention ability may be reduced.
不織布（又は不織布を構成する繊維）は、紫外線防止効果を向上させるために、紫外線吸収剤などの耐光安定剤を含んでいてもよく、繊維内部又は表面に含んでいてもよい。 The non-woven fabric (or the fibers constituting the non-woven fabric) may contain a light-resistant stabilizer such as an ultraviolet absorber, or may be contained inside or on the surface of the fiber in order to improve the ultraviolet ray-preventing effect.
また、不織布（又は不織布を構成する繊維）は、染料や顔料などの着色剤を含んでいてもよく、用途に応じて、繊維内部に含有させたり、繊維表面に付着させることにより、所望の色彩を付与してもよい。 Also, the non-woven fabric (or the fibers constituting the non-woven fabric) may contain a coloring agent such as a dye or a pigment, and depending on the application, the desired color can be obtained by containing it inside the fiber or adhering it to the fiber surface. May be given.
不織布（又は不織布を構成する繊維）は、さらに慣用の添加剤、例えば、植物忌避剤（防根剤）、安定剤（耐熱安定剤、酸化防止剤など）、充填剤、難燃剤、帯電防止剤、界面活性剤、防虫剤（防蟻剤など）、防腐剤（防カビ剤、抗菌剤など）などを含んでいてもよい。 The non-woven fabric (or the fibers constituting the non-woven fabric) may further contain conventional additives, for example, plant repellents (root inhibitors), stabilizers (heat-resistant stabilizers, antioxidants, etc.), fillers, flame retardants, antistatic agents , Surfactants, insect repellents (antitermitants and the like), preservatives (antifungal agents, antifungal agents and the like) and the like may be included.
遮光粒子の材質は、光を透過しない材質（例えば、全光線透過率が０％の材質）で形成されていればよく、プラスチックなどの有機材料であってもよいが、遮光性及び比重が大きい点から、金属、セラミックス、鉱物などの無機材料が好ましく、砕砂、珪砂、砂利などの鉱物粒子が汎用される。 The material of the light shielding particles may be made of a material which does not transmit light (for example, a material having a total light transmittance of 0%), and may be an organic material such as plastic, but the light shielding property and specific gravity are large. From the point of view, inorganic materials such as metals, ceramics and minerals are preferable, and mineral particles such as crushed sand, silica sand and gravel are widely used.
遮光粒子の形状は、特に限定されず、例えば、略等方形状の粒状（略球状、略正方体状など）、略異方形状の粒状（楕円体状、略長方体状、不定形状など）などであってもよい。遮光粒子の平均粒径（異方形状の場合、長径と短径との平均径）は３０ｍｍ以下程度であり、例えば０．０５〜２０ｍｍ、好ましくは０．５〜１５ｍｍ、さらに好ましくは１〜１０ｍｍ（特に２〜５ｍｍ）程度である。粒径が大きすぎると、取り扱い性が低下する虞がある。 The shape of the light shielding particles is not particularly limited, and, for example, substantially isotropic particles (substantially spherical, substantially tetragonal, etc.), substantially anisotropic particles (elliptic, substantially rectangular, irregularly shaped, etc.) Or the like. The average particle diameter (average diameter of the major axis and minor axis in the case of anisotropic shape) of the light shielding particles is about 30 mm or less, and for example, 0.05 to 20 mm, preferably 0.5 to 15 mm, more preferably 1 to 10 mm It is about (especially 2 to 5 mm). If the particle size is too large, the handleability may be reduced.
紫外線防止層は、前記不織布と前記遮光粒子との組み合わせを含んでいてもよいが、通常、不織布、遮光粒子のいずれか一方を含んでいる。 The UV protection layer may contain a combination of the non-woven fabric and the light shielding particles, but usually contains either non-woven fabric or light shielding particles.
不織布のみを含む場合、不織布の割合は、遮水遮光層全体に対して５０質量％以上であってもよく、好ましくは８０質量％以上、さらに好ましくは９０質量％以上（特に９５質量％以上）であり、１００質量％（不織布のみ）であってもよい。 When only a non-woven fabric is included, the ratio of the non-woven fabric may be 50% by mass or more, preferably 80% by mass or more, and more preferably 90% by mass or more (particularly 95% by mass or more) And may be 100% by mass (only non-woven fabric).
遮光粒子のみを含む場合、遮光粒子の割合は、遮水遮光層全体に対して５０質量％以上であってもよく、好ましくは８０質量％以上、さらに好ましくは９０質量％以上（特に９５質量％以上）であり、１００質量％（遮光粒子のみ）であってもよい。遮光粒子は、遮水遮光層に紫外線が到達するのを防ぐために、遮水遮光層の上で隙間なく均一に存在するのが好ましく、遮水遮光層の上に敷設してもよいが、施工性などの点から、慣用のバインダー成分と組み合わせて紫外線防止層を形成してもよい。 When only the light shielding particles are contained, the ratio of the light shielding particles may be 50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more (particularly 95% by mass) with respect to the whole water impermeable shielding layer. Or higher) and may be 100% by mass (only the light shielding particles). The light blocking particles are preferably present uniformly on the water blocking light blocking layer without gaps in order to prevent the ultraviolet rays from reaching the water blocking light blocking layer, and may be laid on the water blocking light blocking layer. From the viewpoint of properties and the like, the UV blocking layer may be formed in combination with a conventional binder component.
これらのうち、太陽光パネルの裏面側の地面に設置した場合、保水による太陽光パネルの発電効率の低下を抑制できる上に、切断加工性などにも優れる点から、不織布が好ましく、保水能や柔軟性に優れ、低目付で均一な密度や厚みを調整し易い点から、短繊維不織布が特に好ましい。短繊維不織布は、慣用の方法、例えば、前記繊維を含むウェブの形成工程と、ウェブの接着工程とを経て調製でき、具体的には、ステープル繊維などを用いたカード法、エアレイ法などの乾式法でウェブを形成した後、ケミカルボンド、サーマルボンド、スパンレース、ニードルパンチ、ステッチボンド法などによりウェブを接着してもよい。これらのうち、嵩高く、保水性や放水性に優れる不織布が得られる点から、ニードルパンチ法が好ましい。 Among these, when installed on the ground on the back side of the solar panel, the non-woven fabric is preferable from the viewpoint of being able to suppress a decrease in the power generation efficiency of the solar panel due to water retention and being excellent in cutting processability etc. A short fiber non-woven fabric is particularly preferable in terms of excellent flexibility, low weight, and easy adjustment of uniform density and thickness. A staple fiber non-woven fabric can be prepared by a conventional method, for example, a step of forming a web containing the fibers and a step of bonding the web, and specifically, a dry method such as card method using staple fiber or the like, air laying method After the web is formed by a method, the web may be adhered by a chemical bond, a thermal bond, a spunlace, a needle punch, a stitch bond method or the like. Among these, the needle punch method is preferable from the viewpoint that a non-woven fabric which is bulky and excellent in water retention and water release is obtained.
紫外線防止層の平均厚みは、例えば１〜１０ｍｍ、好ましくは１．５〜９ｍｍ、さらに好ましくは３〜７ｍｍ程度であるが、特に、紫外線防止層が不織布を含む場合、６ｍｍ以下であってもよく、例えば１．５〜６ｍｍ（例えば４〜６ｍｍ）、好ましくは２〜５．８ｍｍ、さらに好ましくは３〜５．５ｍｍ（特に３．５〜５ｍｍ）程度である。厚すぎると、風により飛散した土壌を保持し易く、水の保水力も大きすぎるためか、防草性が低下する虞があり、逆に薄すぎると、紫外線防止効果が低下すると共に、保水能も低下する虞がある。 The average thickness of the ultraviolet protection layer is, for example, about 1 to 10 mm, preferably 1.5 to 9 mm, and more preferably about 3 to 7 mm, but in particular when the ultraviolet protection layer includes a non-woven fabric, it may be 6 mm or less For example, it is about 1.5 to 6 mm (e.g. 4 to 6 mm), preferably 2 to 5.8 mm, more preferably 3 to 5.5 mm (particularly 3.5 to 5 mm). If it is too thick, it is easy to keep the soil scattered by the wind, and the water holding capacity is too large, so there is a possibility that the grass protection may decrease. Conversely, if it is too thin, the ultraviolet ray prevention effect decreases and the water retention ability also There is a risk of falling.
さらに、紫外線防止層の平均厚みは、遮水遮光層の平均厚みに対して、例えば０．１〜２倍、好ましくは０．３〜１．５倍（０．５〜１．２倍）、さらに好ましくは０．６〜１倍（特に０．７〜０．９倍）程度である。紫外線防止層の厚み比が小さすぎると、紫外線防止効果が低下する虞があり、大きすぎると、風などにより飛散し易くなる。 Furthermore, the average thickness of the ultraviolet protection layer is, for example, 0.1 to 2 times, preferably 0.3 to 1.5 times (0.5 to 1.2 times) the average thickness of the water blocking light-shielding layer, More preferably, it is about 0.6 to 1 (especially 0.7 to 0.9). If the thickness ratio of the ultraviolet ray prevention layer is too small, the ultraviolet ray prevention effect may be reduced. If the thickness ratio is too large, it is likely to be scattered by wind or the like.
［保護層］
本発明の防草ボードは、地面からの植物の生育を抑制するために、遮水遮光層に対して地面と接触する側（通常、遮水遮光層の上）に保護層を積層してもよい。保護層は、防草ボードの柔軟性を保持できる点から、長繊維不織布及び／又は硬質粒子を含むのが好ましい。
[Protective layer]
In the grass protection board of the present invention, in order to suppress the growth of plants from the ground, the protective layer is laminated on the side (usually on the water shielding light shielding layer) in contact with the ground with respect to the water shielding light shielding layer. Good. The protective layer preferably contains a long-fiber non-woven fabric and / or hard particles, from the viewpoint of being able to maintain the softness of the grass board.
長繊維不織布は、有機繊維、無機繊維のいずれで形成されていてもよく、有機繊維及び無機繊維としては、それぞれ、紫外線防止層の不織布として例示された有機繊維、無機繊維などが挙げられる。前記繊維のうち、有機繊維が好ましく、ポリオレフィン繊維、ポリエステル繊維、ポリアミド繊維などの合成繊維などが汎用され、親水性や機械的特性などの点から、ポリエチレンテレフタレート繊維などのポリエステル繊維が特に好ましい。 The long-fiber non-woven fabric may be formed of any of organic fibers and inorganic fibers, and examples of the organic fibers and the inorganic fibers include organic fibers and inorganic fibers exemplified as the non-woven fabric of the ultraviolet ray blocking layer. Among the fibers, organic fibers are preferred, and synthetic fibers such as polyolefin fibers, polyester fibers and polyamide fibers are generally used, and polyester fibers such as polyethylene terephthalate fibers are particularly preferable in terms of hydrophilicity and mechanical properties.
長繊維の横断面形状も、紫外線防止層の不織布を構成する繊維の横断面形状として例示された形状から選択でき、通常、丸型断面である。長繊維の平均繊度も、紫外線防止層の不織布を構成する繊維の平均繊度から選択できる。 The cross-sectional shape of the long fibers can also be selected from the shapes exemplified as the cross-sectional shape of the fibers constituting the non-woven fabric of the UV blocking layer, and is usually a round cross section. The average fineness of the long fibers can also be selected from the average fineness of the fibers constituting the non-woven fabric of the ultraviolet protection layer.
長繊維の平均繊維長は１５０ｍｍを超えていればよく、例えば２００ｍｍ以上、好ましくは５００ｍｍ以上、さらに好ましくは１０００ｍｍ以上であり、無限長であってもよい。長繊維の繊維長が短すぎると、不織布の網目構造の強度（繊維間の結びつき）が低下し、防草性の向上効果が小さくなるとともに、機械的特性が低下する虞がある。 The average fiber length of the long fibers may be more than 150 mm, for example, 200 mm or more, preferably 500 mm or more, more preferably 1000 mm or more, and may be infinite. If the fiber length of the long fiber is too short, the strength (bond between fibers) of the non-woven fabric network structure is reduced, the effect of improving the grass resistance is reduced, and the mechanical properties may be reduced.
長繊維不織布の見掛密度は０．１ｇ／ｃｍ３を超えており、例えば０．１〜０．６ｇ／ｃｍ３、好ましくは０．１２〜０．５ｇ／ｃｍ３、さらに好ましくは０．１５〜０．４ｇ／ｃｍ３程度である。密度が小さすぎると、繊維間の隙間が大きくなり、植物が貫通し易くなる虞がある。 The apparent density of the long-fiber non-woven fabric exceeds 0.1 g / cm 3 , for example, 0.1 to 0.6 g / cm 3 , preferably 0.12 to 0.5 g / cm 3 , more preferably 0.15. It is about 0.4 g / cm 3 . If the density is too low, the gaps between the fibers may be large, and plants may easily penetrate.
長繊維不織布の目付は１０〜５００ｇ／ｍ２、好ましくは２０〜３００ｇ／ｍ２、さらに好ましくは５０〜１５０ｇ／ｍ２程度である。目付が小さすぎると、防草性の向上効果が小さくなる虞がある。 The weight per unit area of the long fiber non-woven fabric is about 10 to 500 g / m 2 , preferably about 20 to 300 g / m 2 , and more preferably about 50 to 150 g / m 2 . If the fabric weight is too small, the grass improvement effect may be reduced.
長繊維不織布は、慣用の方法、例えば、スパンボンド、メルトブロー、フラッシュ紡糸法などの直接紡糸法などにより製造できる。これらのうち、経済性などの点から、スパンボンド法で得られた不織布が汎用される。 The long-fiber non-woven fabric can be produced by a conventional method, for example, a direct spinning method such as spun bonding, melt blowing and flash spinning. Among these, non-woven fabrics obtained by the spunbond method are widely used in terms of economy and the like.
長繊維不織布（又は不織布を構成する繊維）も、紫外線防止層の不織布と同様に、染料や顔料などの着色剤を含んでいてもよく、用途に応じて、繊維内部に含有させたり、繊維表面に付着させることにより、所望の色彩を付与してもよい。長繊維不織布を構成する繊維も、紫外線防止層の不織布の項で例示された慣用の添加剤を含んでいてもよい。 The long-fiber non-woven fabric (or the fibers constituting the non-woven fabric) may also contain a coloring agent such as a dye or a pigment as in the non-woven fabric of the UV blocking layer, depending on the application The desired color may be imparted by adhering to The fibers constituting the long-fiber non-woven fabric may also contain the conventional additives exemplified in the paragraph of the non-woven fabric of the UV protection layer.
硬質粒子としては、前記紫外線防止層の項で例示された有機粒子や無機粒子を利用でき、珪砂などの鉱物粒子が汎用される。硬質粒子の形状も、前記紫外線防止層の遮光粒子の横断面形状として例示された形状から選択できる。硬質粒子の平均粒径も、紫外線防止層の遮光粒子の平均粒径から選択でき、０．０５〜１ｍｍ（特に０．０７〜０．５ｍｍ）程度が好ましい。 As the hard particles, the organic particles and the inorganic particles exemplified in the section of the ultraviolet ray prevention layer can be used, and mineral particles such as silica sand are generally used. The shape of the hard particles can also be selected from the shapes exemplified as the cross-sectional shape of the light shielding particles of the ultraviolet ray prevention layer. The average particle diameter of the hard particles can also be selected from the average particle diameter of the light shielding particles of the ultraviolet ray preventing layer, and about 0.05 to 1 mm (particularly, 0.07 to 0.5 mm) is preferable.
これらのうち、柔軟で防草性にも優れる点から、長繊維不織布が好ましい。 Among these, a long-fiber non-woven fabric is preferable from the viewpoint of being flexible and having excellent anti-grass properties.
保護層の平均厚みは、例えば０．２〜２ｍｍ、好ましくは０．３〜１ｍｍ、さらに好ましくは０．４〜０．６ｍｍ程度である。保護層の厚みが薄すぎると、植物の貫通を抑制するのに必要な機械的特性が低下する虞があり、厚すぎると、柔軟性が低下する虞がある。 The average thickness of the protective layer is, for example, about 0.2 to 2 mm, preferably about 0.3 to 1 mm, and more preferably about 0.4 to 0.6 mm. When the thickness of the protective layer is too thin, mechanical properties necessary to suppress penetration of plants may be reduced, and when it is too thick, flexibility may be reduced.
［接着層］
前記遮水遮光層と前記紫外線防止層又は前記保護層とは、遮水遮光層のアスファルトの接着力により一体化していてもよいが、接着層を介して一体化してもよい。接着層としては、慣用の接着剤や粘着剤、例えば、アスファルト系接着剤、（メタ）アクリル系接着剤又は粘着剤、ポリエステル系接着剤又は粘着剤、ウレタン系接着剤又は粘着剤などで形成された接着層であってもよい。
[Adhesive layer]
The water blocking and light shielding layer and the ultraviolet light blocking layer or the protective layer may be integrated by the adhesive force of the asphalt of the water blocking and light shielding layer, but may be integrated via an adhesive layer. The adhesive layer is formed of a conventional adhesive or adhesive, for example, an asphalt adhesive, (meth) acrylic adhesive or adhesive, polyester adhesive or adhesive, urethane adhesive or adhesive, etc. It may be an adhesive layer.
これらのうち、接着性に優れ、遮光性も有する点から、アスファルト系接着剤が好ましい。アスファルト系接着剤としては、遮水遮光層の項で例示されたアスファルトなどが挙げられる。接着層におけるアスファルトの針入度は、例えば１０〜２００、好ましくは２０〜１５０、さらに好ましくは３０〜１００（特に４０〜９０）程度であってもよい。さらに、アスファルト系接着剤は、遮水遮光層の項で例示された改質アスファルトであってもよく、スチレン−ジエン系共重合体などの有機系改質剤で改質された改質アスファルトが好ましい。 Among these, asphalt-based adhesives are preferable in terms of excellent adhesion and light shielding properties. As an asphalt type adhesive agent, the asphalt etc. which were illustrated by the term of the water blocking light-shielding layer are mentioned. The penetration of asphalt in the adhesive layer may be, for example, about 10 to 200, preferably 20 to 150, and more preferably 30 to 100 (particularly 40 to 90). Furthermore, the asphalt-based adhesive may be the modified asphalt exemplified in the section of the water blocking / light shielding layer, and modified asphalt modified with an organic modifying agent such as a styrene-diene copolymer preferable.
接着層の平均厚みは、例えば０．１〜１．０ｍｍ、好ましくは０．２〜０．７ｍｍ、さらに好ましくは０．３〜０．５ｍｍ程度である。接着層の厚みが薄すぎると、接着性が低下する虞があり、厚すぎると、通水性が低下する虞がある。 The average thickness of the adhesive layer is, for example, about 0.1 to 1.0 mm, preferably about 0.2 to 0.7 mm, and more preferably about 0.3 to 0.5 mm. If the thickness of the adhesive layer is too thin, the adhesiveness may be reduced, and if it is too thick, the water permeability may be reduced.
［防草ボードの特性、製造方法及び使用方法］
本発明の防草ボードは、前記遮水遮光層及び紫外線防止層に加えて、前記保護層及び接着層を備えていてもよいが、さらに慣用の機能層、例えば、忌避層などを備えていてもよい。
[Characteristics of grass board, manufacturing method and method of use]
The grass protection board of the present invention may be provided with the protective layer and the adhesive layer in addition to the water blocking layer and the ultraviolet ray preventing layer, but further comprises a conventional functional layer such as a repellent layer. It is also good.
本発明の防草ボードは、面密度が大きいにも拘わらず、適度な柔軟性を有しており、ＪＩＳ Ｋ７１７１に準拠した曲げ強度（弾性率）が８００〜２０００ＭＰａ程度であり、例えば１０００〜１５００ＭＰａ、好ましくは１０００〜１４００ＭＰａ、さらに好ましくは１０５０〜１３５０ＭＰａ（特に１１００〜１３００ＭＰａ）程度である。弾性率が低すぎると、強度が低下して持ち運びなどの施工性が低下する虞があり、高すぎると、柔軟性が低下する虞がある。 The grass board of the present invention has appropriate flexibility despite the large surface density, and the flexural strength (elastic modulus) according to JIS K7171 is about 800 to 2000 MPa, for example, 1000 to 1500 MPa. Preferably it is 1000-1400 MPa, More preferably, it is about 1050-1350 MPa (especially 1100-1300 MPa). If the modulus of elasticity is too low, the strength may be reduced to reduce the workability such as carrying, and if it is too high, the flexibility may be reduced.
本発明の防草ボードの平均厚み（総厚み）は３ｍｍ以上であってもよく、例えば３〜５０ｍｍ、好ましくは４〜３０ｍｍ、さらに好ましくは５〜２０ｍｍ（特に７〜１５ｍｍ）程度である。 The average thickness (total thickness) of the grass protection board of the present invention may be 3 mm or more, and is, for example, about 3 to 50 mm, preferably 4 to 30 mm, and more preferably 5 to 20 mm (particularly 7 to 15 mm).
本発明の防草ボードの製造方法は、遮水遮光層と、紫外線防止層及び必要に応じて他の層（保護層）とを接着層を介して一体化する方法であってもよく、加熱溶融した遮水遮光層と他の層とを接触させた後、遮水遮光層を固化させて一体化する方法であってもよい。 The method of producing a grass protection board of the present invention may be a method of integrating a water blocking light shielding layer, an ultraviolet ray preventing layer and, if necessary, another layer (protective layer) through an adhesive layer, heating The method may be a method of solidifying and integrating the impermeable and light shielding layer after the melted impermeable and light shielding layer is brought into contact with another layer.
本発明の防草ボードは、地面に敷設して使用され、単独で地面の上に敷設してもよいが、通常、複数の防草ボードを組み合わせて地面に敷設される。複数の防草ボードを組み合わせる場合、複数の防草ボードを並べて敷設し、かつ隣接する防草ボードの境界（継ぎ目）に沿って、境界をカバーするように、防草ボードと地面との間に、遮光シートを介在させてもよい。遮光シートを継ぎ目に沿って敷設することにより、継ぎ目からの植物の生育を抑制できる。防草ボードは、通常、隙間なく並べて敷設されるが、このような遮光シートを敷設する場合は、隙間を設けて敷設してもよいが、防草性の点からは、隙間なく並べて敷設するのが好ましい。 The grass board of the present invention is used by laying on the ground and may be laid alone on the ground, but usually, a plurality of grass boards are combined and laid on the ground. When combining multiple grass protection boards, lay the multiple grass protection boards side by side, and between the grass protection board and the ground so as to cover the boundary along the boundary (seam) of the adjacent grass protection boards. And a light shielding sheet may be interposed. By laying the light shielding sheet along the joint, the growth of plants from the joint can be suppressed. Although the grass protection boards are usually laid side by side without gaps, when laying such a light shielding sheet, they may be laid with gaps, but from the point of grass protection, they are laid side by side without gaps Is preferred.
遮光シートとしては、遮光性を有する限り特に限定されず、例えば、金属シート、セラミックスシート、無機粒子含有プラスチックシート、アスファルトシートなどが挙げられる。さらに、遮光シートは、粘着層を有する遮光シートであってもよい。本発明の防草ボードは、面密度が大きいため、留め具による固定がなくても、風などによる飛散を抑制できるが、このシートの粘着層で継ぎ目を固定することにより、より強固に防草ボードを固定できる。 The light shielding sheet is not particularly limited as long as it has a light shielding property, and examples thereof include metal sheets, ceramic sheets, plastic sheets containing inorganic particles, asphalt sheets and the like. Furthermore, the light shielding sheet may be a light shielding sheet having an adhesive layer. The grass protection board of the present invention can suppress scattering due to wind or the like without fixing by fasteners because the surface density is large, but by fixing the joints with the adhesive layer of this sheet, the grass can be more strongly protected against grass I can fix the board.
粘着層を形成する粘着剤（又は接着剤）としては、例えば、ブチルゴム、イソプレンゴム、シリコーンゴム等のゴム系粘着剤、アスファルト系粘着剤、アクリル系粘着剤、オレフィン系粘着剤などが挙げられる。これらの粘着剤は、単独で又は二種以上組み合わせて使用できる。これらのうち、ブチルゴムなどのゴム系粘着剤、ゴムアスファルトなどのアスファルト系粘着剤が汎用される。 Examples of the pressure-sensitive adhesive (or adhesive) for forming the pressure-sensitive adhesive layer include rubber-based pressure-sensitive adhesives such as butyl rubber, isoprene rubber and silicone rubber, asphalt-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, and olefin-based pressure-sensitive adhesives. These pressure-sensitive adhesives can be used alone or in combination of two or more. Among these, rubber-based adhesives such as butyl rubber and asphalt-based adhesives such as rubber asphalt are widely used.
遮光シートの形状は、継ぎ目をカバーできればよく、通常、継ぎ目に沿った長尺状のシートが使用される。 The shape of the light shielding sheet is only required to cover the joint, and usually, a long sheet along the joint is used.
以下、実施例により、本発明をさらに具体的に説明するが、本発明はこれらの実施例に何ら限定されるものではない。実施例で用いた材料、実施例における各物性値の測定方法を以下に示す。 EXAMPLES The present invention will be described more specifically by the following examples, but the present invention is not limited to these examples. The materials used in the examples and the methods for measuring each physical property value in the examples are shown below.
［用いた材料］
ポリエステル短繊維不織布Ａ：（株）ユニックス製「ＮＡＵＳＧフェルト」、見掛密度０．０７５ｇ／ｃｍ３、目付１２０ｇ／ｍ２、平均厚み１．６ｍｍ、ニードルパンチ不織布
ポリエステル短繊維不織布Ｂ：（株）ユニックス製「ＮＡＵＳＧフェルト」、見掛密度０．０７５ｇ／ｃｍ３、目付２４０ｇ／ｍ２、平均厚み３．２ｍｍ、ニードルパンチ不織布
ポリエステル短繊維不織布Ｃ：（株）ユニックス製「ＮＡＵＳＧフェルト」、見掛密度０．０７５ｇ／ｃｍ３、目付３６０ｇ／ｍ２、平均厚み４．８ｍｍ、ニードルパンチ不織布
アスファルトボードＡ：七王工業（株）製遮音板、厚み６ｍｍ、比重２．８、アスファルトと鉄系無機粉体とを加熱混合して板状に成形した成形体
アスファルトボードＢ：七王工業（株）製防水保護材・軽歩行材「スーパータイト」、面密度９．４ｋｇ／ｍ２、アスファルトと乾燥砂とを加熱混合して板状に成形し、一方の面に砕砂、他方の面に珪砂を接着した成形体。
[Material used]
Polyester short fiber non-woven fabric A: "NAUSG felt" manufactured by Unix Co., Ltd., apparent density 0.075 g / cm 3 , basis weight 120 g / m 2 , average thickness 1.6 mm, needle punched non-woven fabric polyester short fiber non-woven fabric B: Unix “NAUSG felt”, apparent density 0.075 g / cm 3 , basis weight 240 g / m 2 , average thickness 3.2 mm, needle-punched non-woven polyester staple fiber non-woven fabric C: Unix Co., Ltd. “NAUSG felt”, apparent Density 0.075 g / cm 3 , basis weight 360 g / m 2 , average thickness 4.8 mm, needle-punched non-woven fabric Asphalt board A: Sound insulation board manufactured by Nanao Kogyo Co., Ltd., thickness 6 mm, specific gravity 2.8, asphalt and iron-based inorganic Asphalt board B: A waterproof sheet manufactured by Nanao Kogyo Co., Ltd. Protective material / light walker "Super tight", area density 9.4 kg / m 2 , asphalt and dry sand were mixed by heating and formed into a plate shape, crushed sand on one side, and silica sand on the other side Molded body.
［不織布の透過率］
使用した不織布について、自記分光光度計（（株）日立製作所製「Ｕ−４０００」）を用いて、２５０〜４００ｎｍの波長における透過率（最大透過率及び最小透過率）を測定した。結果を表１に示す。最大透過率が５％程度であれば、優れた紫外線吸収性を有しているが、いずれの不織布も優れた紫外線吸収性を有していた。
[Permeability of non-woven fabric]
About the nonwoven fabric used, the transmittance (maximum transmittance and minimum transmittance) at a wavelength of 250 to 400 nm was measured using a self-recording spectrophotometer ("U-4000" manufactured by Hitachi, Ltd.). The results are shown in Table 1. If the maximum transmittance is about 5%, it has excellent ultraviolet absorptivity, but all nonwoven fabrics have excellent ultraviolet absorptivity.
［防草ボードの防草性］
ポットに土壌を充填した後、土壌上部を完全に覆うように、実施例で得られた防草ボードを敷設した。敷設した防草ボードの上及び下に西洋芝の種子３０粒を全体に均一に播種した。なお、比較例１〜３については、防草ボードの上のみに種子を播種した。２０日後に全ての西洋芝の生育状況を確認し、防草効果の有無について、以下の基準で評価した。
[Anti-grassing property of anti-grassing board]
After the pot was filled with soil, the grass board obtained in the example was laid so as to completely cover the upper part of the soil. 30 seeds of western turf were sown uniformly on the top and bottom of the laid grass board. In addition, about Comparative Examples 1-3, the seed was sown only on the grass-protection board. After 20 days, the growth condition of all western turf was confirmed, and the following criteria evaluated about the presence or absence of a weeding effect.
◎：ボード上に播種した種子の発芽又はボード下から貫通した植物体の成長が見られない
×：ボード上に播種した種子の発芽又はボード下から貫通した植物体の成長が見られる。
A: Germination of seed seeded on board or growth of plant penetrating from bottom of the board is not observed. ×: Germination of seed seeded on board or growth of plant penetrating from the bottom is observed.
［隣接する防草ボード間の境界の防草性］
ポットに土壌を充填した後、土壌上部を完全に覆うように、実施例で得られた防草ボード２枚を重ならないように敷設した。さらに、隣接する防草ボード同士について、境界部分の地面に接する面をブチルゴムテープ（日東電工（株）製「ＮＯ．１５ ０．５Ｘ１９Ｘ１０Ｍ」）で固定した。敷設した防草ボードの上及び下に、西洋芝の種子３０粒を全体に均一に播種した。２０日後に全ての西洋芝の生育状況を確認し、防草効果の有無について、以下の基準で評価した。
[Grass resistance of border between adjacent grass protection boards]
After the pot was filled with soil, two grass boards obtained in the example were laid so as not to overlap so as to completely cover the upper part of the soil. Furthermore, the surfaces of the border portions in contact with the ground were fixed with butyl rubber tape ("NO. 15 0.5 X 19 X 10 M" manufactured by Nitto Denko Corporation) for adjacent grass protection boards. On the top and bottom of the laid grass board, 30 seeds of western turf were sown uniformly throughout. After 20 days, the growth condition of all western turf was confirmed, and the following criteria evaluated about the presence or absence of a weeding effect.
◎：ボード上に播種した種子の発芽又はボード下から貫通した植物体の成長が見られない
×：ボード上に播種した種子の発芽又はボード下から貫通した植物体の成長が見られる。
A: Germination of seed seeded on board or growth of plant penetrating from bottom of the board is not observed. ×: Germination of seed seeded on board or growth of plant penetrating from the bottom is observed.
［防草ボードの弾性率］
実施例で得られた防草ボードは、万能試験材料試験機（５ｆｔ）（（株）島津製作所製「型式：ＡＧ−５０ＫＮＤ」）を用いて、ＪＩＳ Ｋ７１７１に準拠して、幅５０ｍｍ、長さ１４０ｍｍ、厚み６ｍｍの試験体について、支点間距離７０ｍｍ、試験速度１００ｍｍ／分、支点半径５ｍｍの条件で、曲げ強度を測定した。
[Elastic modulus of grass board]
Using the universal test material testing machine (5 ft) ("Model: AG-50KND" manufactured by Shimadzu Corporation), the anti-grass board obtained in the example has a width of 50 mm and a length in accordance with JIS K7171. The flexural strength was measured on a test specimen of 140 mm and a thickness of 6 mm under the conditions of a distance between supporting points of 70 mm, a testing speed of 100 mm / min, and a supporting radius of 5 mm.
実施例１
ポリエステル短繊維不織布ＡとアスファルトボードＡとを、粘着剤（アクリル系粘着剤、昭和電工（株）製「ＳＥ−６０１０」）
を用いて貼り合わせ、防草ボードを作製した。
Example 1
A polyester staple fiber non-woven fabric A and an asphalt board A with an adhesive (acrylic adhesive, "SE-6010" manufactured by Showa Denko KK)
It bonded together using this, and produced the grass protection board.
実施例２
ポリエステル短繊維不織布Ａの代わりにポリエステル短繊維不織布Ｂを用いる以外は実施例１と同様にして防草ボードを作製した。
Example 2
A grass protection board was produced in the same manner as in Example 1 except that polyester short fiber non-woven fabric B was used instead of polyester short fiber non-woven fabric A.
実施例３
ポリエステル短繊維不織布Ａの代わりにポリエステル短繊維不織布Ｃを用いる以外は実施例１と同様にして防草ボードを作製した。
Example 3
A grass protection board was produced in the same manner as in Example 1 except that polyester staple fiber nonwoven fabric C was used instead of polyester staple fiber nonwoven fabric A.
実施例４
アスファルトボードＢを防草ボードとして用いた。
Example 4
Asphalt board B was used as a grass board.
比較例１
実施例３で得られた防草ボードのポリエステル短繊維不織布Ｃの上に、さらにポリエステル短繊維不織布Ａを粘着剤（アクリル系粘着剤、昭和電工（株）製「ＳＥ−６０１０」）を用いて貼り合わせ、防草ボードを作製した。
Comparative Example 1
On polyester short fiber non-woven fabric C of the board for preventing grass obtained in Example 3, polyester short fiber non-woven fabric A was further added using an adhesive (acrylic pressure-sensitive adhesive, "SE-6010" manufactured by Showa Denko KK) It stuck and produced a grass protection board.
比較例２
比較例１で得られた防草ボードのポリエステル短繊維不織布Ａの上に、さらにポリエステル短繊維不織布Ａを粘着剤（アクリル系粘着剤、昭和電工（株）製「ＳＥ−６０１０」）を用いて貼り合わせ、防草ボードを作製した。
Comparative example 2
On polyester staple fiber nonwoven fabric A of the grass-preventing board obtained in Comparative Example 1, polyester staple fiber nonwoven fabric A was further added using an adhesive (acrylic adhesive, "SE-6010" manufactured by Showa Denko KK) It stuck and produced a grass protection board.
比較例３
比較例２で得られた防草ボードのポリエステル短繊維不織布Ａの上に、さらにポリエステル短繊維不織布Ａを粘着剤（アクリル系粘着剤、昭和電工（株）製「ＳＥ−６０１０」）を用いて貼り合わせ、防草ボードを作製した。
Comparative example 3
A polyester short fiber non-woven fabric A is further added to the polyester short fiber non-woven fabric A of the anti-grass board obtained in Comparative Example 2 using an adhesive (acrylic pressure-sensitive adhesive, SE-6010 manufactured by Showa Denko KK) It stuck and produced a grass protection board.
実施例１〜４及び比較例１〜３の防草ボードについて防草性を評価し、実施例１〜４の防草ボードについて曲げ強度を測定した結果を表２に示す。なお、防草ボード間の境界の防草性については、実施例４のみ評価し、防草ボードを使用しない結果をブランクとして示した。 The grass protection properties of the grass protection boards of Examples 1 to 4 and Comparative Examples 1 to 3 were evaluated, and the bending strengths of the grass protection boards of Examples 1 to 4 were measured. The results are shown in Table 2. In addition, about the grass protection property of the boundary between grass protection boards, only Example 4 was evaluated and the result which does not use a grass protection board was shown as a blank.
表２の結果から明らかなように、実施例の防草ボードは防草性に優れていたが、比較例の防草ボードではボード上における防草性が低かった。 As is clear from the results in Table 2, the grass board of the example was excellent in grass resistance, but the grass board of the comparative example was low in grass resistance on the board.
本発明の防草ボードは、道路（車道や歩道など）、線路、公園、農園、造林園又はこれらの周辺や、河川敷などにおいて、地面から雑草などの植物が生育するのを抑制するための防草ボードとして利用できるが、容易に施工でき、留め具なども不要である点から、空間部の狭い設置場所（例えば、太陽光パネルと地面との隙間）に敷設する防草ボードとして特に有効利用できる。 The grass protection board of the present invention is for preventing growth of plants such as weeds from the ground on roads (roadways, sidewalks, etc.), tracks, parks, farms, afforestation gardens or their surroundings, riverbeds, etc. Although it can be used as a grass board, it can be used particularly effectively as a grass board to be installed in a narrow installation area (for example, a gap between a solar panel and the ground) because it can be easily installed and fasteners and the like are unnecessary. it can.
Claims (5)
前記防草ボードが、アスファルト及び無機系改質剤を含み、かつ面密度４ｋｇ／ｍ２以上の遮水遮光層と、この遮水遮光層に対して表面側に積層され、かつ表面に露出している紫外線防止層とを含むとともに、
前記紫外線防止層が、目付１２０〜４２０ｇ／ｍ２ 、見掛密度０．０４〜０．１ｇ／ｃｍ ３ の不織布及び／又は平均粒径０．０５〜２０ｍｍの鉱物粒子を含む使用方法。 Between the grass board and the ground so as to cover the boundary along the border of the adjacent grass board, laying a plurality of grass boards side by side on the ground behind the installed solar panels A method of using a herb control board to suppress plant growth by interposing a light shielding sheet ,
The grass protection board is laminated on the surface side with respect to the water blocking light-shielding layer containing asphalt and an inorganic modifier and having an areal density of 4 kg / m 2 or more , and exposed on the surface including Mutotomoni and Tei Ru anti-ultraviolet layer,
The anti-ultraviolet layer, basis weight 120-420 g / m 2, apparent density 0.04~0.1g / cm 3 of the nonwoven and / or methods used including mineral particles having an average particle size 0.05～20Mm.
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| JP2001346454A (en) * | 2000-03-29 | 2001-12-18 | Kantou Regional Constr Bureau Ministry Of Constr | Weed control board or sheet and method of manufacturing the same |
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