WO2014006798A1 - Artificial lawn - Google Patents

Artificial lawn Download PDF

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Publication number
WO2014006798A1
WO2014006798A1 PCT/JP2013/002225 JP2013002225W WO2014006798A1 WO 2014006798 A1 WO2014006798 A1 WO 2014006798A1 JP 2013002225 W JP2013002225 W JP 2013002225W WO 2014006798 A1 WO2014006798 A1 WO 2014006798A1
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Prior art keywords
pile
length
artificial turf
artificial
crystal orientation
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PCT/JP2013/002225
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French (fr)
Japanese (ja)
Inventor
博文 中前
田中　克往
西川　知幸
孝志 堀尾
規夫 舩越
啓介 三宅
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住友ゴム工業株式会社
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Application filed by 住友ゴム工業株式会社 filed Critical 住友ゴム工業株式会社
Priority to CN201380034756.1A priority Critical patent/CN104411886B/en
Priority to EP13813564.5A priority patent/EP2886715A4/en
Priority to US14/407,270 priority patent/US20150125633A1/en
Publication of WO2014006798A1 publication Critical patent/WO2014006798A1/en

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • E01C13/08—Surfaces simulating grass ; Grass-grown sports grounds

Definitions

  • the present invention relates to a technique for improving the durability of a pile in an artificial turf in which a pile is planted on a base fabric.
  • long pile artificial turf As one type of artificial turf, a so-called long pile artificial turf is known in which the pile length is set longer than that of conventional artificial turf.
  • Long pile artificial turf is popular because it can reproduce the properties close to natural turf by filling rubber chips between long piles and lengthening the pile tip exposure.
  • the surface of the artificial turf is loaded with various shoes such as sports shoes with rubber soles from various sports spikes, etc.
  • various shoes such as sports shoes with rubber soles from various sports spikes, etc.
  • wear due to friction with various shoe soles and repeated loads As a result, the pile is easily twisted or broken, which causes the tip of the pile to become fibrillated (small fibers).
  • conventional artificial turf piles are generally stretched about 5 to 7 times, and have high tensile strength but low durability, making it difficult to prevent fibrillation as described above. .
  • an object of the present invention is to provide an artificial turf that does not fibrillate over a long period of time and has stable durability.
  • the present invention has several features described below. That is, in an artificial turf in which a pile is planted on a base fabric, the pile is formed by uniaxially stretching a crystalline plastic to have a degree of crystal orientation of 0.75 to 0.90 (more preferably 0.75 to 0.00). 85). It is characterized by comprising a flat filament yarn.
  • the pile has a flatness ratio (W / H) of 3.0 to 7.0, where H is the length in the minor axis direction of the cross section of the pile and W is the length in the major axis direction.
  • W is the length in the major axis direction.
  • the “cross section” refers to a cross section orthogonal to the pile length direction.
  • the length H in the minor axis direction of the cross section of the pile is 180 to 350 ⁇ m.
  • the pile has a tensile modulus of 150 to 350 N / mm 2 .
  • the crystalline plastic is made of linear low density polyethylene having a density of 0.900 to 0.940.
  • the flatness (W / H) of the pile is 3.0 to 7.0. It becomes difficult to wear, and as a result, the progress of fibrillation can be prevented.
  • the length H in the minor axis direction of the cross section of the pile is 180 to 350 ⁇ m, the durability of the pile is improved.
  • the length H is shorter than 180 ⁇ m, fibrillation tends to occur, which is not preferable.
  • the length H is longer than 350 ⁇ m, the pile becomes thick and not only high in cost, but also easily bends due to bending, and as a result, the flexibility and appearance of the artificial turf are impaired. It is not preferable.
  • the tensile elastic modulus of the pile is 150 to 350 N / mm 2 , the durability of the pile is improved.
  • a tensile modulus of less than 150 N / mm 2 is not preferable because the elastic force is weak and the pile is easily cut and the workability is deteriorated.
  • the tensile elastic modulus is more than 350 N / mm 2 , it is not preferable because the rigidity is increased and bending folds and buckling are easily caused and the flexibility as an artificial grass is impaired.
  • this artificial turf 1 is composed of a base fabric 2 formed in a sheet shape with piles 3 planted at a predetermined interval.
  • the backing agent 4 for preventing the pile 3 from being detached is applied.
  • the base fabric 2 for example, a plain woven fabric made of a thermoplastic resin such as polypropylene or polyethylene is used, but other woven fabrics may be used.
  • the form and material of the base fabric 2 are not particularly limited.
  • the pile 3 is a flat filament having a crystal orientation degree of 0.75 to 0.90 (more preferably 0.75 to 0.85) by uniaxially stretching a crystalline plastic (also called a crystalline polymer). Made of yarn.
  • the pile 3 is made of a flat filament yarn.
  • the pile 3 The flatness (W / H) is formed to be within a range of 3.0 to 7.0.
  • the length H in the minor axis direction of the cross section of the pile 3 is 180 to 350 ⁇ m (more preferably 250 to 300 ⁇ m). That is, when the length H is shorter than 180 ⁇ m, fibrillation tends to occur, which is not preferable.
  • the pile 3 has a tensile modulus of 150 to 350 N / mm 2 . That is, when the tensile modulus is less than 150 N / mm 2 , the elastic force is weak, the pile is easily cut, and the workability is deteriorated, which is not preferable.
  • the tensile elastic modulus is more than 350 N / mm 2 , it is not preferable because the rigidity increases and bending folds and buckling easily occur and the flexibility as an artificial turf is impaired.
  • L-LDPE linear low density polyethylene
  • crystalline plastic of the present invention As a material satisfying the above specifications, linear low density polyethylene (L-LDPE) having a density of 0.900 to 0.940 is used as the crystalline plastic of the present invention. Note that other crystalline plastics may be used as long as each condition described above is satisfied.
  • the pile 3 is composed of a single filament of flat filament yarn having a predetermined fineness (decitex) planted on the base fabric 2, but for example, a plurality of twisted yarns may be used. If each specification mentioned above is satisfied, the usage mode will not be specifically limited.
  • the completed artificial turf 1 is laid on a predetermined base 10 and then filled with rubber chips as the filler 5 between the piles 3.
  • the configuration of the filler 5 and the base 10 is as follows. It is not specifically limited, You may change arbitrarily according to a specification.
  • a linear low-density polyethylene resin composition (density 0.926 g / cm 3 , MFR 0.9 g / 10 min) is melt-extruded using a ⁇ 60 mm extruder at a temperature of 180 ° C. and cooled and solidified in a 30 ° C. water bath.
  • relaxation heat treatment was performed in a hot water tank at 90 to 100 ° C. to obtain artificial turf yarn having a fineness of about 1850 dtex.
  • the pile produced by the above method is twisted into a bundle of six pieces to form one pile.
  • a pile height (pile length from the base fabric to the tip) is applied to a polypropylene plain woven fabric.
  • 70% SBR latex was applied at a coating amount of 1100 g / m 2 on the back side of the base fabric and dried at a high temperature of 105 ° C. to obtain artificial turf.
  • the artificial turf is cut out into a disk shape of ⁇ 100 mm and stored in the bottom of a bottomed cylinder container having the same diameter, and the rubber chip is filled to the extent that the turf tip is exposed 20 mm.
  • the artificial turf is pressed with a load of 700 N by a compressor that can be inserted along the inner peripheral surface of the cylinder container.
  • urethane rubber having a hardness of 60 having a lattice-like unevenness in the image of a shoe sole is attached.
  • the cylinder container was reciprocated at a rotation speed of 25 rpm and an angle of 15 °, and a durability test of 100,000 counts was performed with one reciprocation as one time. After the implementation, 10 artificial turf piles were randomly extracted, and the number of cracks was counted. If the number of occurrences was 0, ⁇ if 1-3, ⁇ , 4 or more were judged as x. .
  • workability refers to the cutting characteristics of an artificial turf pile. After planting the pile on the artificial turf with a tufting machine, the height was cut uniformly so that the pile length would be 60 mm, and there were no defects such as loops remaining. Was evaluated as x.
  • Example 1 [Crystal orientation] 0.81 [Short shaft length H] 0.235mm [Long axis length W] 1.16mm [Flat ratio W / H] 4.936 [Tensile modulus] 190 N / mm 2 [Durability] ⁇ [Machinability] ⁇ [Appearance] ⁇ [Comprehensive evaluation] ⁇
  • Example 2 [Crystal orientation] 0.75 [Short shaft length H] 0.196mm [Long axis length W] 1.37mm [Flat rate W / H] 6.990 [Tensile modulus] 206 N / mm 2 [Durability] ⁇ [Machinability] ⁇ [Appearance] ⁇ [Comprehensive evaluation] ⁇
  • Example 3 [Crystal orientation] 0.90 [Short shaft length H] 0.243mm [Long axis length W] 1.12mm [Flat ratio W / H] 4.609 [Tensile modulus] 273 N / mm 2 [Durability] ⁇ [Machinability] ⁇ [Appearance] ⁇ [Comprehensive evaluation] ⁇
  • Example 4 [Crystal orientation] 0.85 [Short shaft length H] 0.271mm [Long axis length W] 0.91mm [Flat ratio W / H] 3.358 [Tensile modulus] 301 N / mm 2 [Durability] ⁇ [Machinability] ⁇ [Appearance] ⁇ [Comprehensive evaluation] ⁇
  • Example and the comparative example As mentioned above, the following knowledge was acquired by the Example and the comparative example. That is, -By suppressing the degree of crystal orientation, it is rich in flexibility and effective against repeated buckling and twisting. -If the degree of crystal orientation is small, the stickiness will increase and the stability will deteriorate. -If the minor axis length (thickness) is increased, the cutting blade becomes difficult to enter, so that the cutting stability is deteriorated.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)

Abstract

Provided is an artificial lawn that has a high durability and does not undergo fibrillation over a long time. In the artificial lawn, flat filament yarns, which are produced by uniaxially stretching a crystalline plastic material to give a crystal orientation degree of 0.75-0.90, are used as piles (3) to be implanted in a base fabric (2).

Description

人工芝Artificial grass
　本発明は、基布にパイルが植設された人工芝において、さらに詳しく言えば、パイルの耐久性の向上技術に関する。 More specifically, the present invention relates to a technique for improving the durability of a pile in an artificial turf in which a pile is planted on a base fabric.
　パイル間に充填材を充填した人工芝は、天然芝に近い特性を持つ人工芝サーフェイスとして、サッカーやラグビー、野球場などの各種運動競技施設に普及している。また最近では、全天候型である特徴を生かして、学校のグラウンド用として用いられることも年々増えており、人工芝の稼働率が高められてきている。 ”Artificial turf filled with fillers between piles has become popular as an artificial turf surface with characteristics similar to natural turf in various athletic facilities such as soccer, rugby and baseball fields. In recent years, taking advantage of the all-weather feature, it has been increasingly used for school grounds year by year, and the utilization rate of artificial grass has been increased.
　この種の人工芝の１つとして、パイル長を従来の人工芝に比べて長く設定した、いわゆるロングパイル人工芝が知られている。ロングパイル人工芝は、長いパイルの間にゴムチップを充填し、パイル先端の露出を長くすることで、天然芝に近い性状を再現でき、人気がある。 As one type of artificial turf, a so-called long pile artificial turf is known in which the pile length is set longer than that of conventional artificial turf. Long pile artificial turf is popular because it can reproduce the properties close to natural turf by filling rubber chips between long piles and lengthening the pile tip exposure.
　ところで、人工芝の表面には、ゴム底の運動靴から各種競技用スパイク等の様々な靴によって負荷がかけられるため、稼働率の向上に伴い、様々な靴底との摩擦による摩耗や繰り返し荷重によってパイルが捩れたり折れたりしやすく、それが原因でパイルの先端がフィブリル化（小繊維化）する。 By the way, the surface of the artificial turf is loaded with various shoes such as sports shoes with rubber soles from various sports spikes, etc. As the operating rate improves, wear due to friction with various shoe soles and repeated loads As a result, the pile is easily twisted or broken, which causes the tip of the pile to become fibrillated (small fibers).
　そこで、従来の人工芝用パイルは、上述したフィブリル化を防止するため、耐摩耗性のよいポリプロピレンや高密度ポリエチレンが好まれて採用されていた。例えば特許文献１，２参照。 Therefore, in order to prevent the fibrillation described above, conventional artificial turf piles were favored and employed polypropylene and high-density polyethylene with good wear resistance. For example, see Patent Documents 1 and 2.
　しかしながら、ロングパイル人工芝では、従来の砂入り人工芝がフィブリル化する破壊構造とは違い、長く突出したパイルが繰り返し踏みしめられ、ねじり応力が加えられることによって、パイルの屈曲や座屈を破壊起点とした裂けや割れが原因となってフィブリル化が起きる。 However, long pile artificial turf is different from the conventional structure with sandy artificial turf fibrillation, and a long projecting pile is repeatedly stepped on torsional stress, which causes the pile to be bent or buckled. Fibrilization occurs due to cracks and cracks.
　また、特に稼働率の高い人工芝では、フィブリル化の進行によって、芝先が千切れて、プレー性への影響が懸念されるばかりでなく、衣服や靴に千切れたパイルが静電気によって付着して不快である。さらには、千切れたパイルがフィールド外に持ち出されるので、フィールド周りが汚れるなど、管理者側にとっても問題を生じていた。 In addition, artificial turf with a particularly high operating rate is not only concerned with the impact of the turf tip due to the progress of fibrillation, but also due to static electricity. And uncomfortable. Furthermore, since a pile of piles is taken out of the field, the surroundings of the field become dirty, causing problems for managers.
　さらに、従来の人工芝用パイルは、一般的に５～７倍程度の延伸加工が施されており、引張強度は高い反面、耐久性は低く、上述したフィブリル化を防ぐことは困難であった。 Further, conventional artificial turf piles are generally stretched about 5 to 7 times, and have high tensile strength but low durability, making it difficult to prevent fibrillation as described above. .
特開平６－１８４８１１号公報JP-A-6-184811 特開平１１－２６９８１１号公報JP-A-11-269811
　そこで、本発明の目的は、長期にわたってフィブリル化せず、安定した耐久性を有する人工芝を提供することにある。 Therefore, an object of the present invention is to provide an artificial turf that does not fibrillate over a long period of time and has stable durability.
　上述した目的を達成するため、本発明は以下に示すいくつかの特徴を備えている。すなわち、基布にパイルが植設された人工芝において、前記パイルは、結晶性プラスチックを一軸延伸加工して、結晶配向度を０．７５～０．９０（より好ましくは０．７５～０．８５）とした扁平なフィラメント糸からなることを特徴としている。 In order to achieve the above-described object, the present invention has several features described below. That is, in an artificial turf in which a pile is planted on a base fabric, the pile is formed by uniaxially stretching a crystalline plastic to have a degree of crystal orientation of 0.75 to 0.90 (more preferably 0.75 to 0.00). 85). It is characterized by comprising a flat filament yarn.
　より好ましい態様として、前記パイルの断面の短軸方向の長さをＨ、長軸方向の長さをＷとして、前記パイルの扁平率（Ｗ／Ｈ）が３．０～７．０である。なお、本発明において、「断面」とは、パイルの長さ方向に対して直交する断面をいう。 More preferably, the pile has a flatness ratio (W / H) of 3.0 to 7.0, where H is the length in the minor axis direction of the cross section of the pile and W is the length in the major axis direction. In the present invention, the “cross section” refers to a cross section orthogonal to the pile length direction.
　より好ましい態様として、前記パイルの断面の短軸方向の長さＨが、１８０～３５０μｍである。 In a more preferred embodiment, the length H in the minor axis direction of the cross section of the pile is 180 to 350 μm.
　また別の態様として、前記パイルの引張弾性率が、１５０～３５０Ｎ／ｍｍ２である。 In another embodiment, the pile has a tensile modulus of 150 to 350 N / mm 2 .
　より好ましい態様として、前記結晶性プラスチックは、密度が０．９００～０．９４０の直鎖状低密度ポリエチレンからなる。 In a more preferred embodiment, the crystalline plastic is made of linear low density polyethylene having a density of 0.900 to 0.940.
　これによれば、結晶性プラスチックを一軸延伸加工して、結晶配向度が０．７５～０．９０（より好ましくは０．７５～０．８５）の扁平なフィラメント糸をパイルに用いることで、パイルの柔軟性を高めることができ、長期間にわたってフィブリル化することなく、安定した耐久性を有することができる。 According to this, by using a flat filament yarn having a crystal orientation degree of 0.75 to 0.90 (more preferably 0.75 to 0.85) for a pile by uniaxially stretching a crystalline plastic, Pile flexibility can be increased and stable durability can be achieved without fibrillation over a long period of time.
　また、前記パイルの断面の短軸方向の長さをＨ、長軸方向の長さをＷとしたとき、前記パイルの扁平率（Ｗ／Ｈ）が３．０～７．０であることにより、摩耗しにくくなり、その結果、フィブリル化の進行を防ぐことができる。 Moreover, when the length in the minor axis direction of the cross section of the pile is H and the length in the major axis direction is W, the flatness (W / H) of the pile is 3.0 to 7.0. It becomes difficult to wear, and as a result, the progress of fibrillation can be prevented.
　さらには、前記パイルの断面の短軸方向の長さＨが、１８０～３５０μｍであることにより、パイルの耐久性が良好となる。長さＨが１８０μｍよりも短い場合は、フィブリル化が発生しやすくなるため好ましくない。逆に、長さＨが３５０μｍよりも長い場合は、パイルが厚くなり、コスト高になるだけでなく、屈曲による曲げ癖がつきやすくなり、結果的に人工芝としてのしなやかさや外観を損なうため、好ましくない。 Furthermore, when the length H in the minor axis direction of the cross section of the pile is 180 to 350 μm, the durability of the pile is improved. When the length H is shorter than 180 μm, fibrillation tends to occur, which is not preferable. On the other hand, when the length H is longer than 350 μm, the pile becomes thick and not only high in cost, but also easily bends due to bending, and as a result, the flexibility and appearance of the artificial turf are impaired. It is not preferable.
　また、前記パイルの引張弾性率が、１５０～３５０Ｎ／ｍｍ２であることにより、パイルの耐久性が良好となる。引張弾性率が１５０Ｎ／ｍｍ２未満の場合は、弾性力が弱く、パイルが切れやすい上に加工性が悪くなるため好ましくない。逆に引張弾性率が３５０Ｎ／ｍｍ２超の場合は、剛性が増すことで、曲げ癖や座屈しやすく、人工芝としての柔軟性を損なうため好ましくない。 Further, when the tensile elastic modulus of the pile is 150 to 350 N / mm 2 , the durability of the pile is improved. A tensile modulus of less than 150 N / mm 2 is not preferable because the elastic force is weak and the pile is easily cut and the workability is deteriorated. On the other hand, when the tensile elastic modulus is more than 350 N / mm 2 , it is not preferable because the rigidity is increased and bending folds and buckling are easily caused and the flexibility as an artificial grass is impaired.
本発明の一実施形態に係る人工芝を模式的に示した断面図。Sectional drawing which showed typically the artificial grass which concerns on one Embodiment of this invention.
　次に、本発明の実施形態について図面を参照しながら説明するが、本発明はこれに限定されるものではない。 Next, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.
　図１（ａ）に示すように、この人工芝１は、シート状に形成された基布２に対し、所定間隔をもってパイル３が植設されたものからなり、基布２の裏面側には、パイル３の抜け止め用としてのバッキング剤４が塗布されている。 As shown in FIG. 1 (a), this artificial turf 1 is composed of a base fabric 2 formed in a sheet shape with piles 3 planted at a predetermined interval. The backing agent 4 for preventing the pile 3 from being detached is applied.
　基布２は、例えばポリプロピレン，ポリエチレンなどの熱可塑性樹脂からなる平織り布が用いられるが、これ以外の織布であってもよく、本発明において、基布２の形態や材質は特に限定されない。 For the base fabric 2, for example, a plain woven fabric made of a thermoplastic resin such as polypropylene or polyethylene is used, but other woven fabrics may be used. In the present invention, the form and material of the base fabric 2 are not particularly limited.
　パイル３は、結晶性プラスチック（結晶性ポリマーともいう）を一軸延伸加工して、結晶配向度を０．７５～０．９０（より好ましくは、０．７５～０．８５）とした扁平なフィラメント糸からなる。 The pile 3 is a flat filament having a crystal orientation degree of 0.75 to 0.90 (more preferably 0.75 to 0.85) by uniaxially stretching a crystalline plastic (also called a crystalline polymer). Made of yarn.
　図１（ｂ）を参照して、パイル３は、扁平なフィラメント糸からなり、パイル３の断面の短軸方向の長さをＨ、長軸方向の長さをＷとしたとき、パイル３の扁平率（Ｗ／Ｈ）が３．０～７．０の範囲内となるように形成されている。 Referring to FIG. 1 (b), the pile 3 is made of a flat filament yarn. When the length in the minor axis direction of the cross section of the pile 3 is H and the length in the major axis direction is W, the pile 3 The flatness (W / H) is formed to be within a range of 3.0 to 7.0.
　すなわち、扁平率が３．０～７．０であることにより、摩耗しにくくなり、その結果、フィブリル化の進行を防ぐことができる。 That is, when the flatness ratio is 3.0 to 7.0, it becomes difficult to wear, and as a result, the progress of fibrillation can be prevented.
　より好ましい態様としては、パイル３の断面の短軸方向の長さＨが１８０～３５０μｍ（より好ましくは、２５０～３００μｍ）である。すなわち、長さＨが１８０μｍよりも短い場合は、フィブリル化が発生しやすくなるため好ましくない。 In a more preferred embodiment, the length H in the minor axis direction of the cross section of the pile 3 is 180 to 350 μm (more preferably 250 to 300 μm). That is, when the length H is shorter than 180 μm, fibrillation tends to occur, which is not preferable.
　逆に、長さＨが長い場合は、パイルが厚くなり、コスト高になるだけでなく、屈曲による曲げ癖がつきやすくなり、結果的に人工芝としてのしなやかさや外観を損なうため、好ましくない。 On the other hand, if the length H is long, the pile becomes thick and the cost is high, and bending creases are easily caused by bending, and as a result, the flexibility and appearance of the artificial turf are impaired.
　さらに好ましい態様としては、パイル３の引張弾性率が１５０～３５０Ｎ／ｍｍ２である。すなわち、引張弾性率が１５０Ｎ／ｍｍ２未満の場合は、弾性力が弱く、パイルが切れやすい上に加工性が悪くなるため好ましくない。 In a more preferred embodiment, the pile 3 has a tensile modulus of 150 to 350 N / mm 2 . That is, when the tensile modulus is less than 150 N / mm 2 , the elastic force is weak, the pile is easily cut, and the workability is deteriorated, which is not preferable.
　逆に引張弾性率が３５０Ｎ／ｍｍ２超の場合は、剛性が増すことで、曲げ癖や座屈しやすくなり、人工芝としての柔軟性を損なうため好ましくない。 Conversely, when the tensile elastic modulus is more than 350 N / mm 2 , it is not preferable because the rigidity increases and bending folds and buckling easily occur and the flexibility as an artificial turf is impaired.
　上述した各スペックを満たす材料として、本発明の結晶性プラスチックは、密度が０．９００～０．９４０の直鎖状低密度ポリエチレン（Ｌ－ＬＤＰＥ）が用いられる。なお、上述した各条件を満たすものであれば、それ以外の結晶性プラスチックが用いられてもよい。 As a material satisfying the above specifications, linear low density polyethylene (L-LDPE) having a density of 0.900 to 0.940 is used as the crystalline plastic of the present invention. Note that other crystalline plastics may be used as long as each condition described above is satisfied.
　この例において、パイル３は、所定の繊度（デシテックス）の扁平フィラメント糸の単糸を基布２に植設したものからなるが、例えばこれらを複数本撚り合わせたものが用いられてもよく、上述した各スペックを満足すれば、その使用態様は特に限定されない。 In this example, the pile 3 is composed of a single filament of flat filament yarn having a predetermined fineness (decitex) planted on the base fabric 2, but for example, a plurality of twisted yarns may be used. If each specification mentioned above is satisfied, the usage mode will not be specifically limited.
　また、完成した人工芝１は、所定の基盤１０上に敷設されたのち、パイル３間に充填材５としてゴムチップが充填されるが、本発明において、充填材５および基盤１０の構成については、特に限定されず、仕様に応じて任意に変更されてよい。 The completed artificial turf 1 is laid on a predetermined base 10 and then filled with rubber chips as the filler 5 between the piles 3. In the present invention, the configuration of the filler 5 and the base 10 is as follows. It is not specifically limited, You may change arbitrarily according to a specification.
　次に、本発明の具体的な実施例について比較例とともに比較検討した。まず、以下の方法でパイルを作成した。 Next, specific examples of the present invention were compared and examined together with comparative examples. First, a pile was created by the following method.
〔パイルの作製〕
　直鎖状低密度ポリエチレン樹脂組成物（密度０．９２６ｇ／ｃｍ３，ＭＦＲ０．９ｇ／１０ｍｉｎ）をφ６０ｍｍの押出機を使用して温度１８０℃で溶融押出し、３０℃の水槽で冷却固化する。次に、ロール延伸法を用いて９０～１００℃で一軸延伸加工したのち、９０～１００℃の熱水槽内で弛緩熱処理を行い、繊度約１８５０デシテックスの人工芝糸を得た。 [Production of pile]
A linear low-density polyethylene resin composition (density 0.926 g / cm 3 , MFR 0.9 g / 10 min) is melt-extruded using a φ60 mm extruder at a temperature of 180 ° C. and cooled and solidified in a 30 ° C. water bath. Next, after uniaxial stretching at 90 to 100 ° C. using a roll stretching method, relaxation heat treatment was performed in a hot water tank at 90 to 100 ° C. to obtain artificial turf yarn having a fineness of about 1850 dtex.
　〔人工芝の作製〕
　上記方法で作製されたパイルを６本一束に撚り合わせて１本のパイルとし、５／１６ゲージのタフティング機を用いてポリプロピレン製の平織り布にパイル高（基布から先端までのパイル長さ）６０ｍｍとなるように植設したのち、基布の裏面側に固形分として７０％ＳＢＲラテックスを塗布量１１００ｇ／ｍ２で塗布し、１０５℃で高温乾燥して、人工芝を得た。 [Production of artificial grass]
The pile produced by the above method is twisted into a bundle of six pieces to form one pile. Using a 5/16 gauge tufting machine, a pile height (pile length from the base fabric to the tip) is applied to a polypropylene plain woven fabric. A) After planting to 60 mm, 70% SBR latex was applied at a coating amount of 1100 g / m 2 on the back side of the base fabric and dried at a high temperature of 105 ° C. to obtain artificial turf.
　次に、作製したパイルおよび人工芝について、以下の各方法によって測定および各種評価を行った。 Next, measurements and various evaluations were performed on the produced piles and artificial turf by the following methods.
　〔結晶配向度の測定〕
　パイル原糸の表面をＸ線の照射方向に対して垂直になるように試料台にセットし、Ｂｒｕｋｅｒ－ＡＸＳ社製のＸ線回折機（型番：Ｄ８－ＤＩＳＣＯＶＥＲ－μＨＲ－Ｈｙｂｒｉｄ）を使用して、以下の条件下でＸ線を照射し、得られた回折パターンのピークより得られる強度分布の半値幅から結晶配向度を算出した。
　〔測定条件〕
　Ｘ線源：ＣｕＫα線（多層ミラー仕様）
　出力：５０ｋＶ，２２ｍＡ
　検出器：シンチレーションカウンター (Measurement of crystal orientation)
Set the surface of the pile yarn on the sample stage so that it is perpendicular to the X-ray irradiation direction, and use an X-ray diffractometer (model number: D8-DISCOVER-μHR-Hybrid) manufactured by Bruker-AXS The degree of crystal orientation was calculated from the half width of the intensity distribution obtained from the peak of the obtained diffraction pattern after irradiation with X-rays under the following conditions.
〔Measurement condition〕
X-ray source: CuKα ray (multilayer mirror specification)
Output: 50kV, 22mA
Detector: Scintillation counter
　〔引張弾性率の測定〕
　パイル原糸を５０ｍｍの長さに切断し、引張試験機にチャック間３０ｍｍでセットしたのち、引張速度１００ｍｍ／ｍｉｎでパイル原糸が破断するまで引っ張り、その引張荷重－ひずみ曲線（Ｓ－Ｓ曲線）を測定し、弾性変形領域における接線勾配から引張弾性率を算出した。 (Measurement of tensile modulus)
The pile yarn is cut to a length of 50 mm, set in a tensile tester with 30 mm between chucks, and then pulled until the pile yarn breaks at a tensile speed of 100 mm / min, and its tensile load-strain curve (SS curve) ) And the tensile modulus was calculated from the tangential gradient in the elastic deformation region.
　〔耐久性の評価〕
　人工芝をφ１００ｍｍの円盤状に切り出し、同径の有底なシリンダ容器の底に収納し、芝先が２０ｍｍ露出する程度にゴムチップを充填する。シリンダ容器の内周面に沿って挿入可能な圧縮子により人工芝を荷重７００Ｎで押圧する。圧縮子の先端には、靴底をイメージして格子状の凹凸を有する硬度６０のウレタンゴムが取り付けられている。 [Evaluation of durability]
The artificial turf is cut out into a disk shape of φ100 mm and stored in the bottom of a bottomed cylinder container having the same diameter, and the rubber chip is filled to the extent that the turf tip is exposed 20 mm. The artificial turf is pressed with a load of 700 N by a compressor that can be inserted along the inner peripheral surface of the cylinder container. At the tip of the compressor, urethane rubber having a hardness of 60 having a lattice-like unevenness in the image of a shoe sole is attached.
　人工芝を圧縮子で押圧した状態で、回転速度２５ｒｐｍ，角度１５°でシリンダ容器を往復回転させ、１往復を１回として１０万カウントの耐久試験を実施した。実施後、人工芝のパイルを無作為に１０本抽出し、亀裂が生じている本数を数え、発生本数が０本なら◎、１～３本の場合は○、４本以上は×と判断した。 In the state where the artificial turf was pressed with a compressor, the cylinder container was reciprocated at a rotation speed of 25 rpm and an angle of 15 °, and a durability test of 100,000 counts was performed with one reciprocation as one time. After the implementation, 10 artificial turf piles were randomly extracted, and the number of cracks was counted. If the number of occurrences was 0, ◎ if 1-3, ○, 4 or more were judged as x. .
　〔加工性の評価〕
　本実施形態において、加工性とは、人工芝のパイルの切断特性をいう。タフティング機にて人工芝にパイルを植設したのち、パイル長６０ｍｍとなるように、高さが均一にカットされ、かつ、ループ残りなどの不具合がないものを○、不具合が見られたものを×として、評価した。 [Evaluation of workability]
In the present embodiment, workability refers to the cutting characteristics of an artificial turf pile. After planting the pile on the artificial turf with a tufting machine, the height was cut uniformly so that the pile length would be 60 mm, and there were no defects such as loops remaining. Was evaluated as x.
　〔外観性状の評価〕
　競技者１０名による各人工芝と天然芝とを観察し、寸法形状および質感や景観が同等レベルであると、７名以上が感じたものを○、６名以下の場合を×として評価した。
　〔総合評価〕
　最後に、耐久性、加工性および外観性の総合的な評価を行った。評価方法は、上記の各評価において、全てにおいて○もしくは◎の場合を「○」とし、１つでも×があれば「×」とした。 [Evaluation of appearance properties]
Each artificial turf and natural turf by 10 athletes was observed, and when the size, shape, texture and landscape were at the same level, the feeling felt by 7 or more was evaluated as ○, and the case of 6 or less was evaluated as ×.
〔Comprehensive evaluation〕
Finally, comprehensive evaluation of durability, workability and appearance was performed. As for the evaluation method, in each of the above evaluations, in all cases, the case of ○ or ◎ was “◯”, and if there was at least one “×”, it was “×”.
　《実施例１》
〔結晶配向度〕  ０．８１
〔短軸長さＨ〕  ０．２３５ｍｍ
〔長軸長さＷ〕  １．１６ｍｍ
〔扁平率Ｗ／Ｈ〕 ４．９３６
〔引張弾性率〕  １９０Ｎ／ｍｍ２
〔耐久性〕  ◎
〔加工性〕  ○
〔外観〕  ○
〔総合評価〕  ○ Example 1
[Crystal orientation] 0.81
[Short shaft length H] 0.235mm
[Long axis length W] 1.16mm
[Flat ratio W / H] 4.936
[Tensile modulus] 190 N / mm 2
[Durability] ◎
[Machinability] ○
[Appearance] ○
[Comprehensive evaluation] ○
　《実施例２》
〔結晶配向度〕  ０．７５
〔短軸長さＨ〕  ０．１９６ｍｍ
〔長軸長さＷ〕  １．３７ｍｍ
〔扁平率Ｗ／Ｈ〕 ６．９９０
〔引張弾性率〕  ２０６Ｎ／ｍｍ２
〔耐久性〕  ◎
〔加工性〕  ○
〔外観〕  ○
〔総合評価〕  ○ Example 2
[Crystal orientation] 0.75
[Short shaft length H] 0.196mm
[Long axis length W] 1.37mm
[Flat rate W / H] 6.990
[Tensile modulus] 206 N / mm 2
[Durability] ◎
[Machinability] ○
[Appearance] ○
[Comprehensive evaluation] ○
　《実施例３》
〔結晶配向度〕  ０．９０
〔短軸長さＨ〕  ０．２４３ｍｍ
〔長軸長さＷ〕  １．１２ｍｍ
〔扁平率Ｗ／Ｈ〕 ４．６０９
〔引張弾性率〕  ２７３Ｎ／ｍｍ２
〔耐久性〕  ○
〔加工性〕  ○
〔外観〕  ○
〔総合評価〕  ○ Example 3
[Crystal orientation] 0.90
[Short shaft length H] 0.243mm
[Long axis length W] 1.12mm
[Flat ratio W / H] 4.609
[Tensile modulus] 273 N / mm 2
[Durability] ○
[Machinability] ○
[Appearance] ○
[Comprehensive evaluation] ○
　《実施例４》
〔結晶配向度〕  ０．８５
〔短軸長さＨ〕  ０．２７１ｍｍ
〔長軸長さＷ〕  ０．９１ｍｍ
〔扁平率Ｗ／Ｈ〕 ３．３５８
〔引張弾性率〕  ３０１Ｎ／ｍｍ２
〔耐久性〕  ◎
〔加工性〕  ○
〔外観〕  ○
〔総合評価〕  ○ Example 4
[Crystal orientation] 0.85
[Short shaft length H] 0.271mm
[Long axis length W] 0.91mm
[Flat ratio W / H] 3.358
[Tensile modulus] 301 N / mm 2
[Durability] ◎
[Machinability] ○
[Appearance] ○
[Comprehensive evaluation] ○
　〈比較例１〉
〔結晶配向度〕  ０．９２
〔短軸長さＨ〕  ０．２３７ｍｍ
〔長軸長さＷ〕  １．１１ｍｍ
〔扁平率Ｗ／Ｈ〕 ４．６８４
〔引張弾性率〕  ３５７Ｎ／ｍｍ２
〔耐久性〕  ×
〔加工性〕  ○
〔外観〕  ○
〔総合評価〕  × <Comparative example 1>
[Crystal orientation] 0.92
[Short shaft length H] 0.237mm
[Long axis length W] 1.11mm
[Flat ratio W / H] 4.684
[Tensile modulus] 357 N / mm 2
[Durability] ×
[Machinability] ○
[Appearance] ○
[Comprehensive evaluation] ×
　〈比較例２〉
〔結晶配向度〕  ０．９１
〔短軸長さＨ〕  ０．１５０ｍｍ
〔長軸長さＷ〕  １．８０ｍｍ
〔扁平率Ｗ／Ｈ〕 １２．０００
〔引張弾性率〕  ３４８Ｎ／ｍｍ２
〔耐久性〕  ×
〔加工性〕  ○
〔外観〕  ○
〔総合評価〕  × <Comparative example 2>
[Crystal orientation] 0.91
[Short shaft length H] 0.150mm
[Long axis length W] 1.80mm
[Flat ratio W / H] 12.000
[Tensile modulus] 348 N / mm 2
[Durability] ×
[Machinability] ○
[Appearance] ○
[Comprehensive evaluation] ×
　〈比較例３〉
〔結晶配向度〕  ０．７２
〔短軸長さＨ〕  ０．２２０ｍｍ
〔長軸長さＷ〕  １．１２ｍｍ
〔扁平率Ｗ／Ｈ〕 ５．０９１
〔引張弾性率〕  １９５Ｎ／ｍｍ２
〔耐久性〕  ○
〔加工性〕  ×
〔外観〕  ○
〔総合評価〕  × <Comparative Example 3>
[Crystal orientation] 0.72
[Short shaft length H] 0.220mm
[Long axis length W] 1.12mm
[Flat rate W / H] 5.091
[Tensile modulus] 195 N / mm 2
[Durability] ○
[Machinability] ×
[Appearance] ○
[Comprehensive evaluation] ×
　実施例１～４および比較例１～３のまとめを表１に示す。 The summary of Examples 1 to 4 and Comparative Examples 1 to 3 is shown in Table 1.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　以上、実施例および比較例により、以下の知見を得た。すなわち、
・結晶配向度を抑えることで、柔軟性に富み、繰り返し座屈や捩れに対して有効である。
・結晶配向度が小さくなると、充填性で粘りが出てくるため、安定性が悪くなる。
・短軸長さ（厚み）が増すと、切断刃が入りにくくなるので、切断安定性が悪くなる。 As mentioned above, the following knowledge was acquired by the Example and the comparative example. That is,
-By suppressing the degree of crystal orientation, it is rich in flexibility and effective against repeated buckling and twisting.
-If the degree of crystal orientation is small, the stickiness will increase and the stability will deteriorate.
-If the minor axis length (thickness) is increased, the cutting blade becomes difficult to enter, so that the cutting stability is deteriorated.
　１　人工芝
　２　基布
　３　パイル
　４　バッキング剤
　５　充填材
　１０　基盤 1 Artificial grass 2 Base cloth 3 Pile 4 Backing agent 5 Filler 10 Base

Claims (6)

  1. 　基布にパイルが植設された人工芝において、前記パイルは、結晶性プラスチックを一軸延伸加工して、結晶配向度を０．７５～０．９０とした扁平なフィラメント糸からなることを特徴とする人工芝。 In the artificial turf in which a pile is planted on a base fabric, the pile is formed of a flat filament yarn in which a crystalline plastic is uniaxially stretched to have a degree of crystal orientation of 0.75 to 0.90. Artificial grass.
  2. 　前記パイルの結晶配向度が、０．７５～０．８５としたことを特徴とする請求項１に記載の人工芝。 2. The artificial grass according to claim 1, wherein the pile has a crystal orientation of 0.75 to 0.85.
  3. 　前記パイルの断面の短軸方向の長さをＨ、長軸方向の長さをＷとして、前記パイルの扁平率（Ｗ／Ｈ）が３．０～７．０であることを特徴とする請求項２に記載の人工芝。 The pile has a flatness ratio (W / H) of 3.0 to 7.0, where H is the length in the minor axis direction of the cross section of the pile and W is the length in the major axis direction. Item 3. The artificial turf according to Item 2.
  4. 　前記パイルの断面の短軸方向の長さＨが、１８０～３５０μｍであることを特徴とする請求項３に記載の人工芝。 The artificial turf according to claim 3, wherein a length H in a minor axis direction of a cross section of the pile is 180 to 350 µm.
  5. 　前記パイルの引張弾性率が、１５０～３５０Ｎ／ｍｍ２であることを特徴とする請求項１ないし４のいずれか１項に記載の人工芝。 The artificial turf according to any one of claims 1 to 4, wherein the pile has a tensile modulus of 150 to 350 N / mm 2 .
  6. 　前記結晶性プラスチックは、密度が０．９００～０．９４０の直鎖状低密度ポリエチレン（Ｌ－ＬＤＰＥ）からなることを特徴とする請求項１ないし５のいずれか１項に記載の人工芝。 The artificial grass according to any one of claims 1 to 5, wherein the crystalline plastic is made of linear low density polyethylene (L-LDPE) having a density of 0.900 to 0.940.
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EP2886715A4 (en) 2016-03-09
EP2886715A1 (en) 2015-06-24

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