JP2008089620A - Sound absorbing material and attaching method therefor and fiber product - Google Patents
Sound absorbing material and attaching method therefor and fiber product Download PDFInfo
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Images
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- Building Environments (AREA)
- Superstructure Of Vehicle (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
- Nonwoven Fabrics (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
本発明は、厚さが０．５ｍｍ以上の繊維構造体を含む吸音材であって、吸音特性が良好でしかも成型性に優れた吸音材に関するものである。 The present invention relates to a sound-absorbing material including a fiber structure having a thickness of 0.5 mm or more, and having a good sound-absorbing property and excellent moldability.
従来、自動車の天井、ドアパネル、フロアーマット、ボンネット、トランクルーム等、建築材料などの分野で繊維からなる吸音材は多く使用されてきた。また、かかる吸音材として種々の吸音材が提案されている。例えば、高密度層と低密度層を利用した膜吸音効果を利用した吸音材（例えば、特許文献１参照）、メルトブロー不織布による、極細繊維を利用した吸音材（例えば、特許文献２参照）、反毛、落綿、フェノール樹脂を使用した吸音材（例えば、特許文献３参照）、繊維が厚さ方向に配列した吸音材（例えば、特許文献４参照）などが提案されている。 Conventionally, sound-absorbing materials made of fibers have been widely used in fields such as automobile ceilings, door panels, floor mats, bonnets, trunk rooms, and building materials. In addition, various sound absorbing materials have been proposed as such sound absorbing materials. For example, a sound absorbing material using a film sound absorbing effect using a high density layer and a low density layer (for example, see Patent Document 1), a sound absorbing material using ultrafine fibers by a melt blown nonwoven fabric (for example, see Patent Document 2), Sound absorbing materials using hair, cotton wool, phenol resin (for example, see Patent Document 3), sound absorbing materials in which fibers are arranged in the thickness direction (for example, see Patent Document 4), and the like have been proposed.
しかしながら、吸音特性が良好でしかも成型性に優れた吸音材はこれまであまり提案されていない。なお、本出願人は、特願２００６−２５０８１６号において、繊維構造体とシート状物を含む吸音材であって、吸音特性が良好でしかも成型性に優れた吸音材を提案した。 However, a sound absorbing material having good sound absorbing characteristics and excellent moldability has not been proposed so far. In addition, in Japanese Patent Application No. 2006-250816, the present applicant has proposed a sound absorbing material including a fiber structure and a sheet-like material, which has good sound absorbing characteristics and excellent moldability.
本発明は上記の背景に鑑みなされたものであり、その目的は、厚さが０．５ｍｍ以上の繊維構造体を含む吸音材であって、吸音特性が良好でしかも成型性に優れた吸音材および該吸音材を用いてなる繊維製品を提供することにある。 The present invention has been made in view of the above-described background, and an object thereof is a sound absorbing material including a fiber structure having a thickness of 0.5 mm or more, which has good sound absorbing characteristics and excellent moldability. And providing a fiber product using the sound absorbing material.
本発明者らは上記課題を達成するため鋭意検討した結果、非弾性捲縮短繊維と熱接着性複合短繊維とを用いて、繊維が厚さ方向に配列しかつ熱固着点を有する繊維構造体を構成した後、該繊維構造体を厚さ方向にプレスすることにより、吸音特性が良好でしかも成型性に優れた吸音材が得られることを見出し、さらに鋭意検討を重ねることにより本発明を完成するに至った。 As a result of intensive studies to achieve the above-mentioned problems, the present inventors have used a non-elastic crimped short fiber and a heat-adhesive composite short fiber, and a fiber structure in which fibers are arranged in the thickness direction and has a heat fixing point. After that, the fiber structure was pressed in the thickness direction to find that a sound-absorbing material having good sound-absorbing characteristics and excellent moldability was obtained, and the present invention was completed by further earnest studies. It came to do.
かくして、本発明によれば「厚さが０．５ｍｍ以上の繊維構造体を含む吸音材であって、前記繊維構造体が、下記の要件（１）を満足する繊維基材が厚さ方向にプレスされた繊維構造体であることを特徴とする吸音材。」が提供される。
（１）非弾性捲縮短繊維と、該非弾性捲縮短繊維を構成するポリマーよりも４０℃以上低い融点を有するポリマーが、熱融着成分としてその表面に配された熱接着性複合短繊維とが重量比率で９０／１０〜３０／７０となるように混綿され、該熱接着性複合短繊維同士が交差した状態で熱融着された固着点および／または該熱接着性複合短繊維と前記非弾性捲縮短繊維とが交差した状態で熱融着された固着点とが散在し、かつ前記熱接着性複合短繊維と前記非弾性捲縮短繊維が繊維基材の厚さ方向に配列してなる繊維基材。
その際、前記非弾性捲縮短繊維がポリエステル系繊維からなることが好ましい。また、前記熱接着性複合短繊維の熱融着成分が共重合ポリエステルからなることが好ましい。
Thus, according to the present invention, “a sound-absorbing material including a fiber structure having a thickness of 0.5 mm or more, in which the fiber base material satisfies the following requirement (1) in the thickness direction: A sound-absorbing material characterized in that it is a pressed fiber structure. "
(1) A non-elastic crimped short fiber and a heat-adhesive composite short fiber in which a polymer having a melting point lower by 40 ° C. or more than the polymer constituting the non-elastic crimped short fiber is disposed on the surface as a heat-fusion component The adhering point and / or the heat-adhesive conjugate short fiber and the non-bonded material which are blended so as to have a weight ratio of 90/10 to 30/70 and heat-sealed in a state where the heat-adhesive conjugate short fibers cross each other. The fixing points thermally fused in a state where the elastic crimped short fibers intersect with each other are scattered, and the heat-adhesive composite short fibers and the inelastic crimped short fibers are arranged in the thickness direction of the fiber base material. Fiber substrate.
In that case, it is preferable that the said inelastic crimped short fiber consists of a polyester-type fiber. Moreover, it is preferable that the heat-fusible component of the said heat bondable composite staple fiber consists of copolymerized polyester.
本発明の吸音材において、前記繊維構造体の厚さが０．５〜１０ｍｍの範囲内にあることが好ましい。また、前記繊維構造体の密度が０．０８〜０．８ｇ／ｃｍ３の範囲内にあることが好ましい。また、前記熱接着性複合短繊維と前記非弾性捲縮短繊維とがジグザグ形状を有することが好ましい。さらには、吸音材が３次元形状を有することが好ましい。
また、本発明によれば、前記の吸音材を設置面に取り付ける際、吸音材と設置面との間に空気層を設けることを特徴とする吸音材の取付け方法が提供される。
In the sound-absorbing material of the present invention, the thickness of the fiber structure is preferably in the range of 0.5 to 10 mm. Moreover, it is preferable that the density of the said fiber structure exists in the range of 0.08-0.8g / cm < 3 >. Moreover, it is preferable that the said heat bondable composite staple fiber and the said inelastic crimped staple fiber have a zigzag shape. Furthermore, it is preferable that the sound absorbing material has a three-dimensional shape.
Moreover, according to this invention, when attaching the said sound-absorbing material to an installation surface, an air layer is provided between a sound-absorbing material and an installation surface, and the attachment method of the sound-absorbing material characterized by the above-mentioned is provided.
また、本発明によれば、前記の吸音材を用いてなる、自動車の天井、ドアパネル、フロアーマット、ボンネット、トランクルーム、および建築材料からなる群より選択されるいずれかの繊維製品が提供される。 In addition, according to the present invention, there is provided any textile product selected from the group consisting of an automobile ceiling, a door panel, a floor mat, a bonnet, a trunk room, and a building material, using the sound absorbing material.
本発明によれば、厚さが０．５ｍｍ以上の繊維構造体を含む吸音材であって、吸音特性が良好でしかも成型性に優れた吸音材および該吸音材を用いてなる繊維製品が得られる。 According to the present invention, a sound-absorbing material including a fiber structure having a thickness of 0.5 mm or more, a sound-absorbing material having good sound-absorbing characteristics and excellent moldability, and a fiber product using the sound-absorbing material are obtained. It is done.
以下、本発明の実施の形態について詳細に説明する。本発明で使用する非弾性捲縮短繊維としては、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリヘキサメチレンテレフタレート、ポリテトラメチレンテレフタレート、ポリ−１，４−ジメチルシクロヘキサンテレフタレート、ポリエチレンナフタレート、ポリピバロラクトン、ポリ乳酸（ＰＬＡ）またはこれらの共重合体からなる短繊維ないしそれら短繊維の混綿体、または上記ポリマー成分のうちの２種類以上からなる複合短繊維等を挙げることができる。これらの短繊維のうち、繊維形成性等の観点からポリエチレンテレフタレートまたはポリブチレンテレフタレートからなる短繊維が特に好ましい。 Hereinafter, embodiments of the present invention will be described in detail. Examples of inelastic crimped short fibers used in the present invention include polyethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polytetramethylene terephthalate, poly-1,4-dimethylcyclohexane terephthalate, polyethylene naphthalate, polypivalolactone, poly Examples thereof include short fibers made of lactic acid (PLA) or a copolymer thereof, a mixed cotton of these short fibers, or composite short fibers made of two or more of the above polymer components. Among these short fibers, short fibers made of polyethylene terephthalate or polybutylene terephthalate are particularly preferable from the viewpoint of fiber forming property and the like.
この場合の捲縮付与方法としては、熱収縮率の異なるポリマーをサイドバイサイド型に張り合わせた複合繊維を用いてスパイラル状捲縮を付与、異方冷却によりスパイラル状捲縮を付与、捲縮数が３〜４０個／２．５４ｃｍ（好ましくは７〜１５個／２．５４ｃｍ）となるように通常の押し込みクリンパー方式による機械捲縮を付与など、種々の方法を用いればよいが、嵩高性、製造コスト等の面から機械捲縮を付与するのが最適である。 In this case, as a method for imparting crimps, spiral crimps are imparted by using composite fibers obtained by laminating polymers having different thermal shrinkage rates to side-by-side types, spiral crimps are imparted by anisotropic cooling, and the number of crimps is 3 Various methods such as imparting mechanical crimping by a conventional indentation crimper method so as to be ˜40 pieces / 2.54 cm (preferably 7 to 15 pieces / 2.54 cm) may be used, but the bulkiness and production cost are increased. It is optimal to provide mechanical crimping from the viewpoint of the above.
ここで、前記非弾性捲縮短繊維において、単繊維径が２０〜２００μｍの範囲内であることが好ましい。該単繊維径が２０μｍよりも小さいと充分な剛性が得られないおそれがある。逆に該単繊維径２００μｍよりも大きいと充分な吸音特性が得られないおそれがある。 Here, in the inelastic crimped short fiber, it is preferable that the single fiber diameter is in the range of 20 to 200 μm. If the single fiber diameter is smaller than 20 μm, sufficient rigidity may not be obtained. On the other hand, if the single fiber diameter is larger than 200 μm, sufficient sound absorption characteristics may not be obtained.
前記非弾性捲縮短繊維の単繊維横断面形状は、通常の丸断面でもよいし、三角、四角、扁平などの異型断面であってもよい。なお、単繊維横断面形状が異型の場合、前記単繊維径は丸断面に換算した値を使用するものとする。さらに、丸中空断面の場合は外径寸法を測定するものとする。 The single fiber cross-sectional shape of the inelastic crimped short fiber may be a normal round cross section, or an irregular cross section such as a triangle, a square, or a flat shape. In addition, when the single fiber cross-sectional shape is atypical, the single fiber diameter uses a value converted to a round cross section. Furthermore, in the case of a round hollow cross section, the outer diameter dimension shall be measured.
また、前記非弾性捲縮短繊維の繊維長としては３０〜１００ｍｍの範囲内であることが好ましい。該繊維長が３０ｍｍよりも小さいと充分な剛性が得られないおそれがある。逆に該繊維長が１００ｍｍよりも大きいと工程安定性が損われるおそれがある。 The fiber length of the inelastic crimped short fiber is preferably in the range of 30 to 100 mm. If the fiber length is less than 30 mm, sufficient rigidity may not be obtained. Conversely, if the fiber length is greater than 100 mm, process stability may be impaired.
次に、熱接着性複合短繊維の熱融着成分は、上記の非弾性捲縮短繊維を構成するポリマー成分より、４０℃以上低い融点を有することが必要である。この温度が４０℃未満では接着が不十分となる上、腰のない取り扱いにくい繊維構造体となり、本発明の目的が達せられない。 Next, the heat-sealing component of the heat-adhesive composite short fiber needs to have a melting point that is 40 ° C. or lower lower than the polymer component constituting the inelastic crimped short fiber. If this temperature is less than 40 ° C., the adhesion becomes insufficient, and the fiber structure that is difficult to handle and has no waist is formed, and the object of the present invention cannot be achieved.
ここで、熱融着成分として配されるポリマーとしては、ポリウレタン系エラストマー、ポリエステル系エラストマー、非弾性ポリエステル系ポリマー及びその共重合物、ポリオレフィン系ポリマー及びその共重合物、ポリビニルアルコ−ル系ポリマー等を挙げることができ、ポリウレタン系エラストマーとしては、分子量が５００〜６０００程度の低融点ポリオール、例えばジヒドロキシポリエーテル、ジヒドロキシポリエステル、ジヒドロキシポリカーボネート、ジヒドロキシポリエステルアミド等と、分子量５００以下の有機ジイソシアネート、例えばｐ，ｐ’−ジフェニールメタンジイソシアネート、トリレンジイソシアネート、イソホロンジイソシアネート水素化ジフェニールメタンイソシアネート、キシリレンイソシアネート、２，６−ジイソシアネートメチルカプロエート、ヘキサメチレンジイソシアネート等と、分子量５００以下の鎖伸長剤、例えばグリコールアミノアルコールあるいはトリオールとの反応により得られるポリマーである。 Here, as a polymer arranged as a heat-fusion component, polyurethane elastomer, polyester elastomer, inelastic polyester polymer and copolymer thereof, polyolefin polymer and copolymer thereof, polyvinyl alcohol polymer, etc. Examples of polyurethane elastomers include low melting point polyols having a molecular weight of about 500 to 6000, such as dihydroxy polyether, dihydroxy polyester, dihydroxy polycarbonate, dihydroxy polyester amide, and the like, and organic diisocyanates having a molecular weight of 500 or less, such as p, p'-diphenylmethane diisocyanate, tolylene diisocyanate, isophorone diisocyanate hydrogenated diphenylmethane isocyanate, xylylene isocyanate, 2 6-diisocyanate methyl caproate, hexamethylene diisocyanate, molecular weight of 500 or less chain extender, for example a polymer obtained by a reaction between glycol aminoalcohol or triol.
これらのポリマーのうちで、特に好ましいのはポリオールとしてはポリテトラメチレングリコール、またはポリ−ε−カプロラクタムあるいはポリブチレンアジペートを用いたポリウレタンである。この場合の有機ジイソシアネートとしてはｐ，ｐ’−ビスヒドロキシエトキシベンゼンおよび１，４−ブタンジオールを挙げることができる。 Among these polymers, particularly preferred is a polyurethane using polytetramethylene glycol, poly-ε-caprolactam or polybutylene adipate as a polyol. Examples of the organic diisocyanate in this case include p, p'-bishydroxyethoxybenzene and 1,4-butanediol.
また、ポリエステル系エラストマーとしては熱可塑性ポリエステルをハードセグメントとし、ポリ（アルキレンオキシド）グリコールをソフトセグメントとして共重合してなるポリエーテルエステル共重合体、より具体的にはテレフタル酸、イソフタル酸、フタル酸、ナフタレン−２，６−ジカルボン酸、ナフタレン−２，７−ジカルボン酸、ジフェニル−４，４’−ジカルボン酸、１，４−シクロヘキサンジカルボン酸等の脂環式ジカルボン酸、コハク酸、シュウ酸、アジピン酸、セバシン酸、ドデカンジ酸、ダイマー酸等の脂肪族ジカルボン酸またはこれらのエステル形成性誘導体などから選ばれたジカルボン酸の少なくとも１種と、１，４−ブタンジオール、エチレングリコールトリメチレングリコール、テトラメチレングリコール、ペンタメチレングリコール、ヘキサメチレングリコールネオペンチルグリコール、デカメチレングリコール等の脂肪族ジオールあるいは１，１−シクロヘキサンジメタノール、１，４−シクロヘキサンジメタノール、トリシクロデカンメタノール等の脂環式ジオール、またはこれらのエステル形成性誘導体などから選ばれたジオール成分の少なくとも１種、および平均分子量が約４００〜５０００程度のポリエチレングリコール、ポリ（１，２−および１，３−ポリプロピレンオキシド）グリコール、ポリ（テトラメチレンオキシド）グリコール、エチレンオキシドとプロピレンオキシドとの共重合体、エチレンオキシドとテトラヒドロフランとの共重合体等のポリ（アルキレンオキサイド）クリコールのうち少なくとも１種から構成される三元共重合体を挙げることができる。 In addition, as a polyester-based elastomer, a polyetherester copolymer obtained by copolymerizing thermoplastic polyester as a hard segment and poly (alkylene oxide) glycol as a soft segment, more specifically, terephthalic acid, isophthalic acid, phthalic acid Alicyclic dicarboxylic acids such as naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, succinic acid, oxalic acid, At least one dicarboxylic acid selected from aliphatic dicarboxylic acids such as adipic acid, sebacic acid, dodecanedioic acid, dimer acid, or ester-forming derivatives thereof, 1,4-butanediol, ethylene glycol trimethylene glycol, Tetramethylene glycol, Aliphatic diols such as tamethylene glycol, hexamethylene glycol neopentyl glycol, decamethylene glycol, or alicyclic diols such as 1,1-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, tricyclodecane methanol, or the like At least one diol component selected from ester-forming derivatives and the like, and polyethylene glycol, poly (1,2- and 1,3-polypropylene oxide) glycol, poly (tetramethylene oxide) having an average molecular weight of about 400 to 5000 ) Consists of at least one of poly (alkylene oxide) glycols such as glycols, copolymers of ethylene oxide and propylene oxide, copolymers of ethylene oxide and tetrahydrofuran, etc. It can be mentioned terpolymer.
特に、接着性や温度特性、強度の面からすればポリブチレン系テレフタレートをハード成分とし、ポリオキシブチレングリコールをソフトセグメントとするブロック共重合ポリエーテルエステルが好ましい。この場合、ハードセグメントを構成するポリエステル部分は、主たる酸成分がテレフタル酸、主たるジオール成分がブチレングリコール成分であるポリブチレンテレフタレートである。むろん、この酸成分の一部（通常３０モル％以下）は他のジカルボン酸成分やオキシカルボン酸成分で置換されていても良く、同様にグリコール成分の一部（通常３０モル％以下）はブチレングリコール成分以外のジオキシ成分で置換されていても良い。また、ソフトセグメントを構成するポリエーテル部分はブチレングリコール以外のジオキシ成分で置換されたポリエーテルであってよい。 In particular, from the viewpoint of adhesiveness, temperature characteristics, and strength, a block copolymer polyether ester having polybutylene terephthalate as a hard component and polyoxybutylene glycol as a soft segment is preferable. In this case, the polyester portion constituting the hard segment is polybutylene terephthalate in which the main acid component is terephthalic acid and the main diol component is a butylene glycol component. Of course, part of this acid component (usually 30 mol% or less) may be substituted with another dicarboxylic acid component or oxycarboxylic acid component, and part of the glycol component (usually 30 mol% or less) is also butylene. It may be substituted with a dioxy component other than the glycol component. Further, the polyether portion constituting the soft segment may be a polyether substituted with a dioxy component other than butylene glycol.
共重合ポリエステル系ポリマーとしては、アジピン酸、セバシン酸などの脂肪族ジカルボン酸、フタル酸、イソフタル酸、ナフタレンジカルボン酸などの芳香族ジカルボン酸類および／またはヘキサヒドロテレフタル酸、ヘキサヒドロイソフタル酸などの脂環式ジカルボン酸類と、ジエチレングリコール、ポリエチレングリコール、プロピレングリコール、パラキシレングリコールなどの脂肪族や脂環式ジオール類とを所定数含有し、所望に応じてパラヒドロキシ安息香酸などのオキシ酸類を添加した共重合エステル等を挙げることができ、例えばテレフタル酸とエチレングリコールとにおいてイソフタル酸および１，６−ヘキサンジオールを添加共重合させたポリエステル等が使用できる。 Copolyester polymers include aliphatic dicarboxylic acids such as adipic acid and sebacic acid, aromatic dicarboxylic acids such as phthalic acid, isophthalic acid and naphthalenedicarboxylic acid and / or fats such as hexahydroterephthalic acid and hexahydroisophthalic acid. A co-polymer containing a predetermined number of cyclic dicarboxylic acids and aliphatic or alicyclic diols such as diethylene glycol, polyethylene glycol, propylene glycol, and paraxylene glycol, with addition of oxyacids such as parahydroxybenzoic acid as desired. Polymerized esters and the like can be mentioned. For example, polyesters obtained by adding and copolymerizing isophthalic acid and 1,6-hexanediol in terephthalic acid and ethylene glycol can be used.
また、ポリオレフィンポリマーとしては、例えば低密度ポリエチレン、高密度ポリエチレン、ポリプロピレン等を挙げることができる。
上記の熱融着成分の中でも、共重合ポリエステル系ポリマーが特に好ましい。なお、上述のポリマー中には、各種安定剤、紫外線吸収剤、増粘分岐剤、艶消し剤、着色剤、その他各種の改良剤等も必要に応じて配合されていても良い。
Examples of the polyolefin polymer include low density polyethylene, high density polyethylene, and polypropylene.
Of the above heat-sealing components, a copolyester polymer is particularly preferable. In addition, various stabilizers, ultraviolet absorbers, thickening branching agents, matting agents, coloring agents, other various improving agents, and the like may be blended in the above-described polymer as necessary.
熱接着性複合短繊維において、熱融着成分の相手側成分としては前記のような非弾性のポリエステルが好まして例示される。その際、熱融着成分が、少なくとも１／２の表面積を占めるものが好ましい。重量割合は、熱融着成分と非弾性ポリエステルが、複合比率で３０／７０〜７０／３０の範囲にあるのが適当である。熱接着性複合短繊維の形態としては、特に限定されないが、熱融着成分と非弾性ポリエステルとが、サイドバイサイド、芯鞘型であるのが好ましく、より好ましくは芯鞘型である。この芯鞘型の熱接着性複合短繊維では、非弾性ポリエステルが芯部となり、熱可塑性エラストマーが鞘部となるが、この芯部は同心円状、若しくは、偏心状にあってもよい。 In the heat-bondable composite short fiber, the non-elastic polyester as described above is preferably exemplified as the counterpart component of the heat-sealing component. In that case, it is preferable that the heat fusion component occupies at least a half of the surface area. The weight ratio is suitably in the range of 30/70 to 70/30 in terms of the composite ratio of the heat fusion component and the non-elastic polyester. Although it does not specifically limit as a form of a heat bondable composite staple fiber, It is preferable that a heat-fusion component and inelastic polyester are side-by-side and a core-sheath type, More preferably, it is a core-sheath type. In this core-sheath-type heat-bondable composite short fiber, the non-elastic polyester is the core and the thermoplastic elastomer is the sheath, but the core may be concentric or eccentric.
かかる熱接着性複合短繊維において、単繊維径としては２０〜５０μｍの範囲内であることが好ましい。かかる熱接着性複合短繊維Ａは、繊維長が３〜１００ｍｍ（より好ましくは３０〜１００ｍｍ）に裁断されていることが好ましい。 In such a heat-adhesive composite short fiber, the single fiber diameter is preferably in the range of 20 to 50 μm. Such a heat-adhesive composite short fiber A is preferably cut into a fiber length of 3 to 100 mm (more preferably 30 to 100 mm).
本発明においては、上記非弾性捲縮短繊維と上記の熱接着性複合短繊維を混綿させ、加熱処理することにより、該熱接着性複合短繊維同士が交差した状態で熱融着された固着点及び該熱接着性複合短繊維と該非弾性捲縮短繊維とが交差した状態で熱融着された固着点とが散在してなる繊維基材が形成される。 In the present invention, the non-elastic crimped staple fibers and the heat-adhesive composite staple fibers are mixed and heat-treated, so that the heat-adhesive composite staple fibers are heat-sealed in a crossed state. And the fiber base material which the fixing point heat-sealed in the state which this thermoadhesive composite staple fiber and this inelastic crimped staple fiber crossed is scattered is formed.
この際、非弾性捲縮短繊維と熱接着複合短繊維との重量比率は９０／１０〜３０／７０である必要がある。熱接着複合短繊維の比率がこの範囲より少ない場合は、固着点が極端に少なくなり、繊維構造体の腰がなく、成型性が不良となる。一方、熱接着複合短繊維の比率がこの範囲より多い場合は、接着点が多くなり過ぎ、熱処理工程での取扱い性、成型性などが低下する。 At this time, the weight ratio between the inelastic crimped short fibers and the heat-bonded composite short fibers needs to be 90/10 to 30/70. When the ratio of the heat-bonding composite short fiber is less than this range, the fixing points are extremely reduced, the fiber structure is not loose, and the moldability is poor. On the other hand, when the ratio of the heat-bonding composite short fibers is larger than this range, the number of bonding points becomes excessive, and the handling property and moldability in the heat treatment process are lowered.
さらに、本発明においては、繊維基材が厚さ方向に配列していることが肝要である。ここで、「厚さ方向に配列している」とは、繊維基材の厚さ方向に対して平行に配列されている繊維の総本数を（Ｂ）とし、繊維基材の厚さ方向に対して垂直に配列されている繊維の総本数を（Ａ）とするとき、Ｂ／Ａが１．５以上であることである。 Furthermore, in the present invention, it is important that the fiber base materials are arranged in the thickness direction. Here, “arranged in the thickness direction” means that the total number of fibers arranged in parallel to the thickness direction of the fiber base material is (B), and the thickness direction of the fiber base material is On the other hand, when (A) is the total number of fibers arranged vertically, B / A is 1.5 or more.
本発明においては、構成繊維が繊維基材の厚さ方向に配列されているため、プレス加工した後の吸音特性に優れた吸音材が得られる。構成繊維が繊維基材の面方向に配列している場合は、充分な吸音性が得られず好ましくない。 In the present invention, since the constituent fibers are arranged in the thickness direction of the fiber base material, a sound absorbing material having excellent sound absorbing characteristics after pressing is obtained. When the constituent fibers are arranged in the plane direction of the fiber base material, sufficient sound absorption is not obtained, which is not preferable.
このような繊維基材を製造する方法には特に限定はなく、従来公知の方法を任意に採用すれば良いが、例えば非弾性捲縮短繊維と熱接着性複合短繊維とを混綿し、ローラーカードにより均一なウェッブとして紡出した後、図１に示すような熱処理機を用いて、ウェッブをアコーディオン状に折りたたみながら加熱処理し、熱融着による固着点を形成させる方法などが好ましく例示される。例えば特表２００２−５１６９３２号公報に示された装置（市販のものでは、例えばＳｔｒｕｔｏ社製Ｓｔｒｕｔｏ設備など）などを使用するとよい。 A method for producing such a fiber base material is not particularly limited, and any conventionally known method may be arbitrarily adopted. For example, a non-elastic crimped short fiber and a heat-adhesive composite short fiber are mixed to form a roller card. For example, a method of forming a fixing point by heat fusion by spinning the web in an accordion form using a heat treatment machine as shown in FIG. For example, a device disclosed in Japanese Translation of PCT International Publication No. 2002-516932 (for example, commercially available Strut equipment manufactured by Struto Corporation) may be used.
本発明の吸音材は、該繊維基材を厚さ方向にプレスした繊維構造体を含むものである。その際、プレスの方法としては、カレンダーロールまたは、加熱された成型金型で熱プレスする方法や、一定の間隙を持たせた熱カレンダーローラーで処理する方法や、所定形状を持つモールドに所定量のウェッブを詰め込んで圧縮・加熱成型（熱プレス）する方法などが例示される。 The sound-absorbing material of the present invention includes a fiber structure obtained by pressing the fiber base material in the thickness direction. At that time, as a pressing method, a method of heat pressing with a calender roll or a heated molding die, a method of processing with a heat calender roller having a certain gap, a predetermined amount in a mold having a predetermined shape The method of compressing and heat-molding (hot pressing) by stuffing the web is exemplified.
このように繊維基材を厚み方向にプレスすることにより、繊維基材に含まれる非弾性捲縮短繊維および熱接着性複合短繊維が、図４に示すようにジグザグ形状を呈し、繊維構造体の剛性が高くなると同時に吸音性だけでなく優れた成型性が得られる。 By pressing the fiber base material in the thickness direction in this way, the inelastic crimped short fibers and the heat-adhesive composite short fibers contained in the fiber base material have a zigzag shape as shown in FIG. At the same time as the rigidity becomes high, not only the sound absorption but also excellent moldability can be obtained.
かくして得られる繊維構造体の厚さとしては、０．５ｍｍ以上であることが肝要であり、０．５〜１０ｍｍ（より好ましくは０．８〜５ｍｍ）の範囲内にあることが好ましい。該厚さが０．５ｍｍよりも小さいと十分な吸音特性が得られず好ましくない。逆に、該厚さが１０ｍｍよりも大きいと繊維構造体が重くなるため、軽量性が損われるおそれがある。 The thickness of the fiber structure thus obtained is essential to be 0.5 mm or more, and preferably within a range of 0.5 to 10 mm (more preferably 0.8 to 5 mm). If the thickness is less than 0.5 mm, sufficient sound absorption characteristics cannot be obtained, which is not preferable. Conversely, if the thickness is greater than 10 mm, the fiber structure becomes heavy, and the lightness may be impaired.
かかる繊維構造体の密度としては、０．０８〜０．８ｇ／ｃｍ３の範囲内にあることが好ましい。該密度が０．０８ｇ／ｃｍ３よりも小さいと、十分な吸音特性が得られないおそれがある。逆に、該密度が０．８ｇ／ｃｍ３よりもおおきくても、繊維構造体が板状となりその後の成型性が困難になるだけでなく音が反射するようになり、十分な吸音特性が得られないおそれがある。 The density of the fiber structure is preferably in the range of 0.08 to 0.8 g / cm 3 . If the density is less than 0.08 g / cm 3 , sufficient sound absorption characteristics may not be obtained. On the other hand, even if the density is larger than 0.8 g / cm 3 , the fiber structure becomes plate-like and subsequent moldability becomes difficult and sound is reflected, so that sufficient sound absorption characteristics can be obtained. There is a risk of not being able to.
本発明の吸音材は前記の繊維構造体を含む吸音材である。その際、前記の繊維構造体を単独で用いることが好ましいが、必要に応じて前記繊維構造体にシート状物を貼り合せてもよい。かかるシート状物としては、スパンボンドもしくはメルトブローンもしくはフラッシュボンド等の直接紡糸法による不織布や、スパンレースもしくはエアレイドもしくはカード法による短繊維構造体による不織布で、強度や経済性、壁材としての使用時の作業性を考慮すると厚さが０．０１ｍｍ以上５ｍｍ以下が好ましい。更に好ましくは、０．１ｍｍ以上２ｍｍ以下である。使用する素材としては、ポリエチレンテレフタレート（ＰＥＴ）、ポリブチレンテレフタレート（ＰＢＴ）、ポリエチレンナフタレンジカルボキシレート（ＰＥＮ）、ポリ乳酸（ＰＬＡ）やこれらの共重合体に代表されるポリエステル、ナイロン６、ナイロン６６等のポリアミド、その他ポリオレフィン、アクリル、モダクリル等の合成繊維やレーヨン、および絹、綿、麻、羊毛等の天然繊維が挙げられる。 The sound absorbing material of the present invention is a sound absorbing material including the fiber structure. At that time, it is preferable to use the fiber structure alone, but a sheet-like material may be bonded to the fiber structure as necessary. Such sheet-like materials include nonwoven fabrics by direct spinning methods such as spunbond, meltblown, and flashbond, and nonwoven fabrics by short fiber structure by spunlace, airlaid, or card method. When used as a wall material In consideration of the workability, the thickness is preferably 0.01 mm or more and 5 mm or less. More preferably, they are 0.1 mm or more and 2 mm or less. Materials used include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalene dicarboxylate (PEN), polylactic acid (PLA) and polyesters represented by these copolymers, nylon 6, nylon 66 And other natural fibers such as silk, cotton, hemp, and wool.
また、シート状物がフィルムでも良い。フィルムを全面に積層した場合、壁構造体の通気止めとしてそのまま使用できる。厚さは、前記と同様の理由で０．０１ｍｍ以上５ｍｍ以下が好ましい。更に好ましくは、０．０５ｍｍ以上１ｍｍ以下である。使用する素材としては、ポリエチレンテレフタレート（ＰＥＴ）、ポリブチレンテレフタレート（ＰＢＴ）、ポリエチレンナフタレンジカルボキシレート（ＰＥＮ）、ポリトリメチレンテレフタレート（ＰＴＴ）、ポリ乳酸（ＰＬＡ）やこれらの共重合体に代表されるポリエステル、ナイロン６、ナイロン６６等のポリアミド、その他ポリオレフィン、アクリル、モダクリル等の合成繊維が挙げられる。 Further, the sheet may be a film. When the film is laminated on the entire surface, it can be used as it is as a vent for the wall structure. The thickness is preferably 0.01 mm or more and 5 mm or less for the same reason as described above. More preferably, it is 0.05 mm or more and 1 mm or less. Examples of the materials used include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalene dicarboxylate (PEN), polytrimethylene terephthalate (PTT), polylactic acid (PLA) and copolymers thereof. Polyester such as polyester, nylon 6 and nylon 66, and other synthetic fibers such as polyolefin, acrylic and modacrylic.
繊維集合体の片面にシート状物を形成させることにより、シート状物側からの入射音に対する吸音性能が飛躍的に向上する。これは通常の繊維集合体部分による吸音効果とは別に、シート（膜）が特定周波数領域で共振するという「膜吸音」という効果が新たに発生するためである。なお、シート状物は、片面以外に裏面や繊維構造体の内層に設置することも可能である。 By forming the sheet-like material on one side of the fiber assembly, the sound absorbing performance with respect to the incident sound from the sheet-like material side is dramatically improved. This is because the effect of “film sound absorption” that a sheet (film) resonates in a specific frequency region is newly generated in addition to the sound absorption effect by the normal fiber assembly portion. In addition, a sheet-like thing can also be installed in the inner layer of a back surface or a fiber structure other than one side.
繊維構造体とシート状物を貼り合せる方法としては、単に繊維構造体とシート状物を加熱プレスする方法や、機械的にニードル等により接合する方法、または、接着層を設ける方法等がある。接着層としては、粉体又はシート状、ネット状等で、熱により初めて溶融接着されるホットメルトタイプの樹脂や低融点樹脂繊維からなる不織布が好ましい。なお、低融点樹脂または低融点樹脂繊維の組成としては、ウレタン系、アクリル系等の樹脂でもよいが、リサイクル性の点より繊維構造体と同じ、ポリエステル系の接着剤または接着シートが好ましい。 As a method for bonding the fiber structure and the sheet-like material, there are a method in which the fiber structure and the sheet-like material are simply heated and pressed, a method in which the fiber structure is mechanically joined with a needle, a method in which an adhesive layer is provided, and the like. The adhesive layer is preferably a non-woven fabric made of a hot-melt type resin or a low-melting resin fiber that is first melt-bonded by heat in the form of powder, sheet, net, or the like. The composition of the low-melting point resin or the low-melting point resin fiber may be a urethane-based resin or an acrylic-based resin, but the same polyester-based adhesive or adhesive sheet as the fiber structure is preferable from the viewpoint of recyclability.
また、前記の繊維構造体を、厚み方向に対してほぼ垂直、または、必要に応じてやや斜めにスライサー設備等によりスライスし、スライスされた切断面にシート状物を貼り合わせてもよい。このように繊維構造体の切断面にフィルムを貼り合せることにより、繊維構造体の切断面が平坦なので、貼り合わせ後のフィルム表面も平坦になる。さらに、繊維が厚み方向に配列しているために、繊維構造体に含まれる繊維と接着層、フィルムとの摩擦も増加し貼り合わせが容易となる。 In addition, the fiber structure may be sliced by a slicer facility or the like approximately perpendicularly to the thickness direction or slightly obliquely as necessary, and a sheet-like material may be bonded to the sliced cut surface. By sticking the film to the cut surface of the fiber structure in this way, the cut surface of the fiber structure is flat, so that the film surface after bonding is also flat. Furthermore, since the fibers are arranged in the thickness direction, the friction between the fibers contained in the fiber structure, the adhesive layer, and the film is increased, and bonding becomes easy.
本発明の吸音材において、形状は特に限定されないが、本発明の吸音材は優れた剛性（成型性）を有するので任意の３次元形状に成型可能である。特に、図５に模式的に示すように吸音材を設置面に取り付ける際、吸音材と設置面との間に空気層を設けると優れた吸音性が得られ好ましい。なお、該空気層の高さとしては１ｍｍ以上（より好ましくは５〜３０ｍｍ）であることが好ましい。 The shape of the sound-absorbing material of the present invention is not particularly limited, but the sound-absorbing material of the present invention has excellent rigidity (moldability) and can be molded into an arbitrary three-dimensional shape. In particular, when the sound absorbing material is attached to the installation surface as schematically shown in FIG. 5, it is preferable to provide an air layer between the sound absorbing material and the installation surface because excellent sound absorbing properties can be obtained. The height of the air layer is preferably 1 mm or more (more preferably 5 to 30 mm).
本発明の吸音材には、前述のように、熱接着性複合短繊維と非弾性捲縮短繊維が繊維構造体の厚さ方向に配列され、かつ厚さ方向にプレスされた繊維構造体が含まれる。その結果、本発明の吸音材は良好な吸音特性だけでなく優れた成型性をも呈する。
なお、本発明の吸音材には、通常の染色加工や起毛加工が施されていてもよい。さらには、撥水加工、防炎加工、難燃加工、マイナスイオン発生加工など公知の機能加工が付加されていてもさしつかえない。
As described above, the sound-absorbing material of the present invention includes a fiber structure in which heat-adhesive composite short fibers and inelastic crimped short fibers are arranged in the thickness direction of the fiber structure and pressed in the thickness direction. It is. As a result, the sound absorbing material of the present invention exhibits not only good sound absorbing characteristics but also excellent moldability.
The sound-absorbing material of the present invention may be subjected to normal dyeing or raising. Furthermore, known functional processing such as water repellent processing, flameproof processing, flame retardant processing, and negative ion generation processing may be added.
次に本発明の繊維製品は、前記の吸音材を用いてなる、自動車の天井、ドアパネル、フロアーマット、ボンネット、トランクルーム、および建築材料からなる群より選択されるいずれかの繊維製品である。かかる繊維製品は、前記の吸音材を用いているので良好な吸音特性だけでなく優れた成型性をも呈する。 Next, the textile product of the present invention is any textile product selected from the group consisting of an automobile ceiling, a door panel, a floor mat, a bonnet, a trunk room, and a building material, using the sound absorbing material. Such a fiber product exhibits not only good sound absorption characteristics but also excellent moldability because of the use of the sound absorbing material.
次に本発明の実施例及び比較例を詳述するが、本発明はこれらによって限定されるものではない。なお、実施例中の各測定項目は下記の方法で測定した。
（１）融点
Ｄｕ Ｐｏｎｔ社製 熱示差分析計９９０型を使用し、昇温２０℃／分で測定し、融解ピークをもとめた。融解温度が明確に観測されない場合には、微量融点測定装置（柳本製作所製）を用い、ポリマーが軟化して流動を始めた温度（軟化点）を融点とする。なお、ｎ数５でその平均値を求めた。
（２）捲縮数
ＪＩＳ Ｌ １０１５ ７．１２に記載の方法により測定した。なお、ｎ数５でその平均値を求めた。
（３）Ｂ／Ａ
プレス前の繊維基材を厚さ方向に切断し、その断面において、厚さ方向に対して平行に配列されている繊維（図２において０°≦θ≦４５°）の総本数を（Ｂ）とし、繊維基材の厚さ方向に対して垂直に配列されている繊維（図２において４５°＜θ≦９０°）の総本数を（Ａ）としてＢ／Ａを算出した。なお、本数の測定は、任意の１０ヶ所について各々３０本の繊維を透過型光学顕微鏡で観察し、その数を数えた。
（４）吸音特性（吸音率）
シート状物が音源側に位置するよう試料を配し、吸音率を、ＪＩＳ−Ａ１４０５による垂直入射吸音率であって、Ｂｒｕｅｌ＆Ｋｊａｒ社製マルチチャンネル分析システム３５５０型（ソフトウェア：ＢＺ５０８７型２チャンネル分析ソフトウェア）による２マイクロフォン法で測定した。吸音率は、１０００Ｈｚ時で比較した。
（５）繊維構造体の厚さ（ｃｍ）
ＪＩＳ Ｋ６４００により測定した。
（６）繊維構造体の密度（ｇ／ｃｍ３）
下記式により密度（ｇ／ｃｍ３）を求めた。
密度（ｇ／ｃｍ３）＝ウエッブの目付け（ｇ／ｃｍ２）／繊維構造体の厚さ（ｃｍ）
（７）剛性（曲げ強さ）
ＪＩＳ Ｋ７２０３に準拠して５０ｍｍ（幅）×１５０ｍｍ（長さ）のサイズの試験片を用い、スパン１００ｍｍにて、１０ｍｍ／分の曲げ速度で最大の曲げ強さを測定し剛性（Ｎ／５ｃｍ）とした。
（８）単繊維径（μｍ）
電子顕微鏡で３５０倍に拡大し、ｎ数１０で単繊維径を測定し、その平均値を算出した。
（９）成型性：１９０℃、１８０秒間熱絞り加工し、内径６０ｍｍ×高さ２０ｍｍ×厚み５ｍｍのケースに成形した。このケースの胴部における外観を観察し、以下の基準で評価した。
３級：外観上に変化が見られない。
２級：表面に皺が見られる。
１級：表面に大きな皺が見られる。
Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.
(1) Melting point Using a differential thermal analyzer 990 manufactured by Du Pont, measured at a temperature increase of 20 ° C./min, and obtained a melting peak. If the melting temperature is not clearly observed, the melting point is the temperature at which the polymer softens and starts to flow (softening point) using a trace melting point measuring device (manufactured by Yanagimoto Seisakusho). In addition, the average value was calculated | required by n number 5.
(2) Number of crimps The number of crimps was measured by the method described in JIS L 1015 7.12. In addition, the average value was calculated | required by n number 5.
(3) B / A
The fiber base material before pressing is cut in the thickness direction, and the total number of fibers (0 ° ≦ θ ≦ 45 ° in FIG. 2) arranged in parallel to the thickness direction in the cross section is (B) B / A was calculated with the total number of fibers (45 ° <θ ≦ 90 ° in FIG. 2) arranged perpendicular to the thickness direction of the fiber base as (A). In addition, the measurement of the number was carried out by observing 30 fibers for each of 10 arbitrary positions with a transmission optical microscope, and counting the number.
(4) Sound absorption characteristics (sound absorption rate)
The sample is arranged so that the sheet-like material is located on the sound source side, and the sound absorption coefficient is the normal incident sound absorption coefficient according to JIS-A1405, which is a multi-channel analysis system 3550 type manufactured by Bruel & Kjar (software: BZ5087 type 2-channel analysis software) Measured by the 2-microphone method. The sound absorption rate was compared at 1000 Hz.
(5) Fiber structure thickness (cm)
It was measured according to JIS K6400.
(6) Density of fiber structure (g / cm 3 )
The density (g / cm 3 ) was determined by the following formula.
Density (g / cm 3 ) = Web weight (g / cm 2 ) / Fibre structure thickness (cm)
(7) Rigidity (bending strength)
Using a test piece with a size of 50 mm (width) x 150 mm (length) according to JIS K7203, the maximum bending strength was measured at a bending speed of 10 mm / min at a span of 100 mm, and the stiffness (N / 5 cm) It was.
(8) Single fiber diameter (μm)
It magnified 350 times with the electron microscope, the single fiber diameter was measured by n number 10, and the average value was computed.
(9) Moldability: Heat drawn at 190 ° C. for 180 seconds, and molded into a case having an inner diameter of 60 mm × height of 20 mm × thickness of 5 mm. The appearance of the case at the body was observed and evaluated according to the following criteria.
Third grade: No change in appearance.
Second grade: wrinkles are seen on the surface.
First grade: Large wrinkles are seen on the surface.
［実施例１〜３、比較例１，２］
熱接着性成分の共重合ポリエステルとしてテレフタル酸とイソフタル酸とを６０／４０（モル％）で混合した酸成分と、エチレングリコールとジエチレングリコールとを８５／１５（モル％）で混合したジオール成分とから共重合ポリエステルを得た。該共重合ポリエステルの軟化点は１１０℃であったので１１０℃をもって融点とした。ペレットを減圧乾燥した後、鞘部に用いた。一方、ガラス転位点６７℃、融点２５６℃のポリエチレンテレフタレートを減圧乾燥後、芯部とし、芯鞘型複合溶融紡糸装置に供給し、体積比５０／５０の複合比率で、紡糸温度２９０℃、吐出量６５０ｇ／分で、紡糸孔数４５０の紡糸口金から溶融紡出した。油剤を付与し、９００ｍ／分で引き取って未延伸芯鞘型複合繊維を得た。
[Examples 1 to 3, Comparative Examples 1 and 2]
As a copolyester of a thermal adhesive component, an acid component obtained by mixing terephthalic acid and isophthalic acid at 60/40 (mol%), and a diol component obtained by mixing ethylene glycol and diethylene glycol at 85/15 (mol%). A copolyester was obtained. Since the softening point of the copolyester was 110 ° C., the melting point was taken as 110 ° C. The pellet was dried under reduced pressure and then used for the sheath. On the other hand, polyethylene terephthalate having a glass transition point of 67 ° C. and a melting point of 256 ° C. is dried under reduced pressure, and then the core is supplied to a core-sheath type composite melt spinning apparatus. Melt spinning was performed from a spinneret having a spinning hole number of 450 at an amount of 650 g / min. An oil agent was applied and taken out at 900 m / min to obtain an unstretched core-sheath type composite fiber.
この未延伸繊維を集束し、１１万ｄｔｅｘ（１０万デニール）のトウにして、まず７２℃の温水中で２．５倍に延伸した後、８０℃の温水中で更に１．１５倍に延伸し油剤を付与した後、３５℃まで自然に冷却された押し込み式クリンパーで捲縮を付与し、繊維長５１ｍｍに切断して単糸繊度４．４ｄｔｅｘの熱接着性複合短繊維を得た。このときの捲縮数は１１個／２５ｍｍであった。 The unstretched fibers are bundled to make a 110,000 dtex (100,000 denier) tow, first stretched 2.5 times in warm water at 72 ° C., and further stretched 1.15 times in warm water at 80 ° C. After applying the oiling agent, crimping was performed with an indentation type crimper naturally cooled to 35 ° C., and cut into a fiber length of 51 mm to obtain a heat-adhesive composite short fiber having a single yarn fineness of 4.4 dtex. The number of crimps at this time was 11 pieces / 25 mm.
この熱接着性複合短繊維５０％（重量）と、非弾性捲縮短繊維として常法により得られた単繊維の太さが６．６ｄｔｅｘ、繊維長が６４ｍｍ、捲縮数が８ケ／２１０ｃｍの中空断面ポリエチレンテレフタレート短繊維（ポリエチレンテレフタレートの融点２５６℃、中空率３２％）５０％（重量）とをカードにより混綿し、ローラーカードとストルート設備を使用し熱処理した繊維構造体を作製した、一方同様の繊維配合にてローラーカード後のウエブをクロスレイアーおよびエアースルータイプの加熱設備にて熱処理した繊維基材を作製した。得られた繊維機材の品質は、表１の通りである。 50% (by weight) of this heat-adhesive composite short fiber, the thickness of a single fiber obtained by a conventional method as an inelastic crimped short fiber is 6.6 dtex, the fiber length is 64 mm, and the number of crimps is 8/210 cm. A hollow cross-section polyethylene terephthalate short fiber (melting point of polyethylene terephthalate 256 ° C, hollow rate 32%) 50% (weight) was blended with a card, and a heat-treated fiber structure was produced using a roller card and a strut facility. A fiber substrate was prepared by heat-treating the web after the roller card with a cloth layer and air-through type heating equipment. Table 1 shows the quality of the obtained textile equipment.
次いで、これら繊維基材を、１９０℃に加熱された金属製平板の間にはさみ、熱プレスした後、室温にて冷却し吸音材を得た。本願によるストルートつまりＢ／Ａが１．５以上による実施例１、２を表１に示す。また、クロスレイヤーによるＢ／Ａが１．５未満の比較例１、加熱プレスの無い比較例２を表１に示す。また、測定サンプルと測定壁面の間に空間を設置した実施例３を表１に示す。なお、いずれの場合にも、非弾性捲縮短繊維の単繊維径が２４．８μｍ、熱接着性複合短繊維の単繊維径が２０．３μｍであった。 Next, these fiber base materials were sandwiched between metal flat plates heated to 190 ° C., hot pressed, and then cooled at room temperature to obtain a sound absorbing material. Table 1 shows Examples 1 and 2 in which the strut according to the present application, that is, B / A is 1.5 or more. Table 1 shows Comparative Example 1 in which B / A by a cross layer is less than 1.5, and Comparative Example 2 without a heating press. Table 3 shows Example 3 in which a space was installed between the measurement sample and the measurement wall surface. In any case, the single fiber diameter of the inelastic crimped short fiber was 24.8 μm, and the single fiber diameter of the heat-adhesive composite short fiber was 20.3 μm.
表１に示すとおり、Ｂ／Ａが１．５以上で高密度のものはＢ／Ａが１．５未満のものに比べ、薄くても吸音性が高いことが確認できる。また、裏面に空間を持たせることでさらにその効果をアップすることができる。 As shown in Table 1, it can be confirmed that a material having a B / A of 1.5 or more and a high density has a high sound absorbing property even if it is thin as compared with a material having a B / A of less than 1.5. Moreover, the effect can be further improved by providing a space on the back surface.
本発明によれば、厚さが０．５ｍｍ以上の繊維構造体を含む吸音材であって、吸音特性が良好でしかも成型性に優れた吸音材および該吸音材を用いてなる繊維製品が得られ、その工業的価値は極めて大である。 According to the present invention, a sound-absorbing material including a fiber structure having a thickness of 0.5 mm or more, a sound-absorbing material having good sound-absorbing characteristics and excellent moldability, and a fiber product using the sound-absorbing material are obtained. And its industrial value is extremely large.
１：ウエッブ
２：コンベア
３：ヒーター
４：繊維基材
Ｃ：空気層
Ｄ：吸音材
Ｅ：設置面
1: Web 2: Conveyor 3: Heater 4: Fiber base material C: Air layer D: Sound absorbing material E: Installation surface
Claims (9)
前記繊維構造体が、下記の要件（１）を満足する繊維基材が厚さ方向にプレスされた繊維構造体であることを特徴とする吸音材。
（１）非弾性捲縮短繊維と、該非弾性捲縮短繊維を構成するポリマーよりも４０℃以上低い融点を有するポリマーが、熱融着成分としてその表面に配された熱接着性複合短繊維とが重量比率で９０／１０〜３０／７０となるように混綿され、該熱接着性複合短繊維同士が交差した状態で熱融着された固着点および／または該熱接着性複合短繊維と前記非弾性捲縮短繊維とが交差した状態で熱融着された固着点とが散在し、かつ前記熱接着性複合短繊維と前記非弾性捲縮短繊維が繊維基材の厚さ方向に配列してなる繊維基材。 A sound absorbing material including a fiber structure having a thickness of 0.5 mm or more,
The sound absorbing material, wherein the fiber structure is a fiber structure in which a fiber base material that satisfies the following requirement (1) is pressed in the thickness direction.
(1) A non-elastic crimped short fiber and a heat-adhesive composite short fiber in which a polymer having a melting point lower by 40 ° C. or more than the polymer constituting the non-elastic crimped short fiber is disposed on the surface as a heat-fusion component The adhering point and / or the heat-adhesive conjugate short fiber and the non-bonded material which are blended so as to have a weight ratio of 90/10 to 30/70 and heat-sealed in a state where the heat-adhesive conjugate short fibers cross each other. The fixing points thermally fused in a state where the elastic crimped short fibers intersect with each other are scattered, and the heat-adhesive composite short fibers and the inelastic crimped short fibers are arranged in the thickness direction of the fiber base material. Fiber substrate.
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| JP2010102236A (en) * | 2008-10-27 | 2010-05-06 | Teijin Fibers Ltd | Manufacturing method for sound-absorbing structure, and the sound-absorbing structure |
| JP2010122606A (en) * | 2008-11-21 | 2010-06-03 | Fukuda Denshi Co Ltd | Plate-like sound-absorbing member and plate-like sound-absorbing member manufacturing method |
| JP2011058581A (en) * | 2009-09-11 | 2011-03-24 | Teijin Fibers Ltd | Duct material and duct |
| DE102011075798A1 (en) | 2010-06-08 | 2011-12-08 | Toyota Boshoku Kabushiki Kaisha | Fiber structure article and method of manufacture of this |
| JP2011255771A (en) * | 2010-06-08 | 2011-12-22 | Toyota Boshoku Corp | Composite structural article |
| JP2012026059A (en) * | 2010-07-26 | 2012-02-09 | Teijin Fibers Ltd | Core material for vacuum heat insulator and vacuum heat insulator using the core material |
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| JP2019511975A (en) * | 2016-01-27 | 2019-05-09 | オートニアム マネジメント アクチエンゲゼルシャフトＡｕｔｏｎｅｕｍ Ｍａｎａｇｅｍｅｎｔ ＡＧ | Highly thermoset felt for noise attenuation |
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| JP2010122606A (en) * | 2008-11-21 | 2010-06-03 | Fukuda Denshi Co Ltd | Plate-like sound-absorbing member and plate-like sound-absorbing member manufacturing method |
| JP2011058581A (en) * | 2009-09-11 | 2011-03-24 | Teijin Fibers Ltd | Duct material and duct |
| US9045610B2 (en) | 2010-06-08 | 2015-06-02 | Toyota Boshoku Kabushiki Kaisha | Composite structural article |
| JP2011255771A (en) * | 2010-06-08 | 2011-12-22 | Toyota Boshoku Corp | Composite structural article |
| CN102296747A (en) * | 2010-06-08 | 2011-12-28 | 丰田纺织株式会社 | Kompositbauteil |
| DE102011075798B4 (en) * | 2010-06-08 | 2012-10-04 | Toyota Boshoku Kabushiki Kaisha | Fiber structure article and method of manufacture of this |
| DE102011075798A1 (en) | 2010-06-08 | 2011-12-08 | Toyota Boshoku Kabushiki Kaisha | Fiber structure article and method of manufacture of this |
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| JP2012026059A (en) * | 2010-07-26 | 2012-02-09 | Teijin Fibers Ltd | Core material for vacuum heat insulator and vacuum heat insulator using the core material |
| KR101310388B1 (en) * | 2011-04-25 | 2013-09-23 | 엔브이에이치코리아(주) | Headliner for vehicle having water-soluble adhesive |
| US10580395B2 (en) | 2014-09-30 | 2020-03-03 | Compagnie Generale Des Etablissements Michelin | Sound absorbing body |
| JP2019511975A (en) * | 2016-01-27 | 2019-05-09 | オートニアム マネジメント アクチエンゲゼルシャフトＡｕｔｏｎｅｕｍ Ｍａｎａｇｅｍｅｎｔ ＡＧ | Highly thermoset felt for noise attenuation |
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