JP6887661B2 - Sound absorber - Google Patents

Sound absorber Download PDF

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JP6887661B2
JP6887661B2 JP2016223626A JP2016223626A JP6887661B2 JP 6887661 B2 JP6887661 B2 JP 6887661B2 JP 2016223626 A JP2016223626 A JP 2016223626A JP 2016223626 A JP2016223626 A JP 2016223626A JP 6887661 B2 JP6887661 B2 JP 6887661B2
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sound absorbing
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武志 櫻井
武志 櫻井
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東京ブラインド工業株式会社
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本発明は、主に室内で使用し、生活雑音を吸音できる吸音装置に関する。 The present invention relates to a sound absorbing device that is mainly used indoors and can absorb daily noise.

２枚の表面板で挟まれたコア材内に合成樹脂発泡粒子（独立気泡）を充填した断熱遮音パネルが提案されている（特許文献１）。この場合、表面板として、フェノール、エポキシなどの樹脂の化粧合板、石膏ボード、金属板などが提案されている。 A heat insulating and sound insulating panel in which synthetic resin foam particles (closed cells) are filled in a core material sandwiched between two surface plates has been proposed (Patent Document 1). In this case, as the surface plate, decorative plywood made of resin such as phenol and epoxy, gypsum board, metal plate and the like have been proposed.

また、板材で仕切られたセル空間内弾性変形性を有するＮＢＲゴムビーズ粉粒体等の弾性粉粒体を封入した提案があった（特許文献２）。この場合、弾性粉粒体の拘束、ロッキングによる制振性能低下を図るためセル空間内に少なくとも２％の空隙部を設ける提案もあった。また、板材としてアルミニウムなどの金属、木質材料が提案されている。 Further, there has been a proposal to enclose an elastic powder or granular material such as an NBR rubber bead powder or granular material having elastic deformability in a cell space partitioned by a plate material (Patent Document 2). In this case, there has been a proposal to provide a gap of at least 2% in the cell space in order to restrain the elastic powder and reduce the vibration damping performance due to locking. Further, as a plate material, a metal such as aluminum and a wood material have been proposed.

また、建造物の床下や天井裏に、発泡性ポリスチロールの粉砕物を吹き込み断熱性能、吸音性能を向上させた断熱工法が提案されている（特許文献３）。 Further, a heat insulating method has been proposed in which crushed foamed polyester is blown under the floor or under the ceiling of a building to improve heat insulating performance and sound absorbing performance (Patent Document 3).

また、出願人は、フェルト状の吸音板とペーパーコア材と遮音板を積層した吸音パネルを提案している（特許文献４）。この場合、ペーパーコア材はフェルト状の吸音板と遮音板との間の空気層としての役割と、音がペーパーコア材の隔壁に触れて振動による減衰を図ったものである。また、この場合、ペーパーコア材の一部を切り取り、機能開口として、機能開口内に所望の吸音特性を確保するための各種吸音材料を詰める提案もしている（特許文献４）。 Further, the applicant has proposed a sound absorbing panel in which a felt-shaped sound absorbing plate, a paper core material, and a sound insulating plate are laminated (Patent Document 4). In this case, the paper core material serves as an air layer between the felt-shaped sound absorbing plate and the sound insulating plate, and the sound touches the partition wall of the paper core material and is attenuated by vibration. Further, in this case, it is also proposed to cut out a part of the paper core material and fill the functional opening with various sound absorbing materials for ensuring desired sound absorbing characteristics (Patent Document 4).

特開平６−１７４９３号公報Japanese Unexamined Patent Publication No. 6-17493 特開平１１−２１７８９１号公報Japanese Unexamined Patent Publication No. 11-217891 特開２００７−６３８８３号公報JP-A-2007-63883 特開２０１５−２２９９１１号公報Japanese Unexamined Patent Publication No. 2015-229911

特許文献１、３の前記従来の技術はいずれも、発泡性樹脂の多孔性を利用する提案である。特許文献２では、粒子の弾性変形による振動エネルギーとして、音を吸収しようとする提案である。また、特許文献１、２はセルで囲うことにより、単に粉粒体の収納スペースとしてしか機能させていない。さらに、特許文献１〜３では、粉粒体の特性により吸音効果を図ったものであるが、粉粒体に接触する板材に工夫がなく、粉粒体と板材もセル同様に粉粒体を収容するためだけの機能しかなかった。また、特許文献４では機能開口で吸音性能を調整する提案があったが、個々のセルを使って具体的な吸音性能を変える提案はなかった。 All of the above-mentioned conventional techniques of Patent Documents 1 and 3 are proposals that utilize the porosity of the foamable resin. Patent Document 2 is a proposal to absorb sound as vibration energy due to elastic deformation of particles. Further, Patent Documents 1 and 2 function only as a storage space for powder or granular material by enclosing them in cells. Further, in Patent Documents 1 to 3, the sound absorbing effect is achieved by the characteristics of the powder or granular material, but the plate material in contact with the powder or granular material is not devised, and the powder or granular material and the plate material are also powder or granular material like the cell. It had only the function of accommodating. Further, in Patent Document 4, there is a proposal to adjust the sound absorption performance by the functional opening, but there is no proposal to change the specific sound absorption performance by using each cell.

本発明は、多孔性の粉粒体とフェルト状の板材と遮音材とを組み合わせたので、装置全体としての吸音性能を向上させて、様々な音域での吸音効果を高めた。 In the present invention, since the porous powder or granular material, the felt-like plate material, and the sound insulating material are combined, the sound absorbing performance of the entire device is improved, and the sound absorbing effect in various sound ranges is enhanced.

即ちこの発明は、フェルト状吸音板材と、多数の小筒体を備えるペーパーコア材と、遮音材とを順に積層してなる吸音装置であって、以下のように構成したことを特徴とした吸音装置である。
(1) 前記ペーパーコア材は、前記小筒体の一方の開口を前記フェルト状吸音材に、他方の開口を前記遮音材側に向けて配置し、
(2) 前記多数の小筒体の両開口を結ぶ方向を厚さ方向とし、少なくとも１つの小筒体内で、厚さ方向または厚さ方向と略直角な方向に、
「多孔質の微細粉体の集合体層」、または、
「連続気泡を備える多孔質の樹脂ブロック層」および「多孔質の微細粉体の集合体層」、
を形成した。
また、他の発明は、フェルト状吸音板材と、多数の小筒体を備えるペーパーコア材と、遮音材とを順に積層してなる吸音装置であって、以下のように構成したことを特徴とした吸音装置である。
(1) 前記ペーパーコア材は、前記小筒体の一方の開口を前記フェルト状吸音材に、他方の開口を前記遮音材側に向けて配置し、
(2) 前記多数の小筒体の両開口を結ぶ方向を厚さ方向とし、少なくとも１つの小筒体内で、厚さ方向または厚さ方向と略直角な方向に、
「多孔質の微細粉体の集合体層」および空気層
を形成した。 That is, the present invention is a sound absorbing device in which a felt-shaped sound absorbing plate material, a paper core material provided with a large number of small cylinders, and a sound insulating material are laminated in order, and is characterized by being configured as follows. It is a device.
(1) In the paper core material, one opening of the small cylinder is arranged toward the felt-like sound absorbing material, and the other opening is arranged toward the sound insulating material side.
(2) the the thickness direction and a direction connecting both openings of a number of small pipes, at least one small tube body in the thickness direction or thickness towards direction substantially perpendicular,
"Aggregate layer of porous fine powder" or
"Porous resin block layer with open cells" and "Aggregate layer of porous fine powder",
Was formed.
Another invention is a sound absorbing device in which a felt-shaped sound absorbing plate material, a paper core material provided with a large number of small cylinders, and a sound insulating material are laminated in order, and is characterized by being configured as follows. It is a sound absorbing device.
(1) In the paper core material, one opening of the small cylinder is arranged toward the felt-like sound absorbing material, and the other opening is arranged toward the sound insulating material side.
(2) the the thickness direction and a direction connecting both openings of a number of small pipes, at least one small tube body in the thickness direction or thickness towards direction substantially perpendicular,
An "aggregate layer of porous fine powder" and an air layer were formed.

また、他の発明は、フェルト状吸音板材と、多数の小筒体を備えるペーパーコア材と、遮音材とを順に積層してなる吸音装置であって、以下のように構成したことを特徴とした吸音装置である。
(1) 前記ペーパーコア材は、前記小筒体の一方の開口を前記フェルト状吸音材に、他方の開口を前記遮音材側に向けて配置し、
(2) 前記多数の小筒体の両開口を結ぶ方向を厚さ方向とし、少なくとも１つの小筒体内で、厚さ方向または厚さ方向と略直角な方向に、「連続気泡を備える多孔質の樹脂ブロック層」、「多孔質の微細粉体の集合体層」および空気層を形成した。 Another invention is a sound absorbing device in which a felt-shaped sound absorbing plate material, a paper core material provided with a large number of small cylinders, and a sound insulating material are laminated in order, and is characterized by being configured as follows. It is a sound absorbing device.
(1) In the paper core material, one opening of the small cylinder is arranged toward the felt-like sound absorbing material, and the other opening is arranged toward the sound insulating material side.
(2) said direction connecting the both openings of a number of small pipes and a thickness direction, at least one small tube body in the thickness direction or thickness towards direction substantially perpendicular, porosity comprising "open cell resin blocking layer quality "to form a" porous aggregate layer of the fine powder "and air layer.

また、他の発明は、フェルト状吸音板材と、多数の小筒体を備えるペーパーコア材と、遮音材とを順に積層してなる吸音装置であって、以下のように構成したことを特徴とした吸音装置である。
(1) 前記ペーパーコア材は、前記小筒体の一方の開口を前記フェルト状吸音材に、他方の開口を前記遮音板側に向けて配置し、
(2) 少なくとも１つの小筒体内に連続気泡を備える多孔質の樹脂ブロック層を形成し、他の少なくとも１つの小筒体内に多孔質の微細粉体の集合体層を形成した。 Another invention is a sound absorbing device in which a felt-shaped sound absorbing plate material, a paper core material provided with a large number of small cylinders, and a sound insulating material are laminated in order, and is characterized by being configured as follows. It is a sound absorbing device.
(1) In the paper core material, one opening of the small cylinder is arranged with the felt-like sound absorbing material, and the other opening is arranged with the sound insulating plate side.
(2) A porous resin block layer having open cells was formed in at least one small cylinder, and an aggregate layer of porous fine powder was formed in at least one other small cylinder.

また、前記において、「連続気泡の微細空間を備える樹脂ブロック層」をフェノール系樹脂のブロック状発泡体とし、「多孔質の微細粉体の集合体層」をフェノール系樹脂のブロック状発泡体を粉砕して形成したことを特徴とする吸音装置である。 Further, in the above, the "resin block layer having a fine space of open cells" is a block-shaped foam of a phenol-based resin, and the "aggregate layer of porous fine powder" is a block-shaped foam of a phenol-based resin. It is a sound absorbing device characterized by being formed by crushing.

前記における遮音材は、表面が通気性を有しない材料で覆われた構造であれば良く、いわゆる遮音板や壁などの遮音面を含む。 The sound insulating material in the above may have a structure in which the surface is covered with a non-breathable material, and includes a sound insulating surface such as a so-called sound insulating plate or a wall.

この発明は、フェルト状の吸音板材と遮音板との間をペーパーコア材で、間隔を空けて配置し、ペーパーコア材内に連続気泡を備える多孔質の樹脂ブロック層および多孔質の微細粉体の集合体層を形成したので、吸音板材と遮音板との間に空気層を確保して、多孔質の樹脂による吸音性能を付加できる。樹脂により空気層が削減されたにも関わらず、とりわけ、低温域と高音域で、吸音率を向上させることができる。したがって、ペーパーコア材内に空気層のみとした構造と組み合わせることにより、各使用場所で、求める音域毎（周波数領域）に異なる吸音効果を達成できる。 In the present invention, a paper core material is used between the felt-shaped sound absorbing plate material and the sound insulating plate at intervals, and a porous resin block layer having open cells in the paper core material and a porous fine powder. Since the aggregate layer of the above is formed, an air layer can be secured between the sound absorbing plate material and the sound insulating plate, and the sound absorbing performance by the porous resin can be added. Despite the reduction of the air layer by the resin, the sound absorption coefficient can be improved especially in the low temperature range and the high frequency range. Therefore, by combining with a structure in which only the air layer is formed in the paper core material, it is possible to achieve different sound absorption effects for each desired sound range (frequency range) at each place of use.

この発明の吸音装置で、（ａ）は平面図、（ｂ）はＡ−Ａ断面図、（ｃ）はＢ−Ｂ拡大断面図である。In the sound absorbing device of the present invention, (a) is a plan view, (b) is a sectional view taken along the line AA, and (c) is an enlarged sectional view taken along the line BB. この発明の吸音装置の拡大Ａ−Ａ断面図で、コア材内の構成を表す図である。FIG. 5 is an enlarged cross-sectional view taken along the line AA of the sound absorbing device of the present invention, showing the configuration inside the core material. この発明の吸音装置で、Ｂ−Ｂ拡大断面図で、コア材内に配置を表すIn the sound absorbing device of the present invention, the arrangement is shown in the core material in the enlarged cross-sectional view of BB. この発明の他の吸音装置の側面図である。It is a side view of the other sound absorbing device of this invention. 比較試験結果のグラフである。It is a graph of the comparative test result. 同じく比較試験結果のグラフである。It is also a graph of comparative test results.

１．実施態様 1. 1. Embodiment

図面に基づきこの発明の実施態様を説明する。 Embodiments of the present invention will be described with reference to the drawings.

（１） この発明の吸音装置４０は、フェルト状の吸音板１０と、多数の小筒体（コア）２１、２１を備えるペーパーコア材（ペーパーハニカム）２０と、遮音板３０とを順に積層して構成する（図１）。ペーパーコア材２０の小筒体２１の一方の開口はフェルト状の吸音板１０に向き、他の開口は遮音材３０を向く。 (1) In the sound absorbing device 40 of the present invention, a felt-shaped sound absorbing plate 10, a paper core material (paper honeycomb) 20 having a large number of small cylinders (cores) 21 and 21, and a sound insulating plate 30 are laminated in this order. (Fig. 1). One opening of the small cylinder 21 of the paper core material 20 faces the felt-shaped sound absorbing plate 10, and the other opening faces the sound insulating material 30.

（２） フェルトの吸音板２０は、繊維材料を圧縮して構成する。例えば、ＰＥＴ（ポリエチレンテレフタレート）樹脂繊維と塩化ビニル繊維とを含む材料を圧縮して、フェルト状の板として、このフェルト状の吸音板を形成する。 吸音板２０は、厚さｔ２で、形成する。
また、吸音板２０は、例えば、以下のようにして製造した材料を使用することもできる。天然繊維と化学繊維とからなるリサイクル繊維原料を解繊し、バインダー樹脂として、これにＰＥＴ樹脂繊維を混合して原反を作り、この原反を５０℃〜１５０℃程度に加熱し冷熱ロールを使用して、面重量０．５〜１．０ｋｇ／ｍ２、空気流れ抵抗値１０００〜４０００Ｎ・ｓ／ｍ３の繊維硬質板を形成して、この繊維硬質板からフェルト状吸音板を構成する。 (2) The felt sound absorbing plate 20 is formed by compressing a fiber material. For example, a material containing PET (polyethylene terephthalate) resin fiber and vinyl chloride fiber is compressed to form this felt-like sound absorbing plate as a felt-like plate. The sound absorbing plate 20 has a thickness of t 2 and is formed.
Further, as the sound absorbing plate 20, for example, a material manufactured as follows can be used. Recycled fiber raw material composed of natural fiber and chemical fiber is defibrated, and PET resin fiber is mixed with this as a binder resin to make raw fabric, and this raw fabric is heated to about 50 ° C to 150 ° C to make a cold roll. By using, a fiber hard plate having a surface weight of 0.5 to 1.0 kg / m 2 and an air flow resistance value of 1000 to 4000 N · s / m 3 is formed, and a felt-like sound absorbing plate is formed from the fiber hard plate. ..

（３） 遮音板３０として、通気性を有しない厚紙を使用する。遮音板３０は、空気を通さない材料から構成することが望ましく、例えば鉄やアルミニウムなどの金属板、せっこうボード、樹脂板など任意である。また、遮音性を有しない板材の表面を、通気性を有しないフィルムや薄板で覆って構成することもできる。 (3) As the sound insulating plate 30, thick paper having no breathability is used. The sound insulation plate 30 is preferably made of a material that does not allow air to pass through, and is optional, for example, a metal plate such as iron or aluminum, a gypsum board, or a resin plate. Further, the surface of the plate material having no sound insulation may be covered with a film or a thin plate having no air permeability.

（４） ペーパーコア材２０は、小筒体（コア）２１、２１が連続した主に紙製または紙に樹脂加工した材料で、小筒体２１の断面を長方形で形成した材料を採用する。この場合、小筒体２１の断面は、いわゆる６角形（ハニカムコア）、平行四辺形や長方形（バイアスコア）、円を基調にしたコア、直線と波を基調にした形状など任意である（図示していない）。
また、連続気泡を備える多孔質の樹脂ブロック層２２として、フェノール系の樹脂の発泡体のブロックを使用する。このフェノール系の樹脂の発泡体のブロック層２２は、連続気泡を備えており、すなわち、多数の気泡を内装しており、ブロック層２２の一面から少なくとも対向する他面に気泡が連続して、空気が通る構造となっている。したがって、このようなブロック層２２では、ブロック層２２を水面に触れると毛細管作用により素早く水を吸収することができ、かつ吸収した水をブロック層２２内に保持することができるような材料となる。
また、このフェノール系の樹脂の発泡体を砕くと細かい粉体を形成し、各粉体も多数の細かい気泡を有する多孔質となっている（（この気泡も一部または全部が連続気泡となっていることが望ましいが、多孔質であれば、独立気泡のみでも可能である）。この多孔質の微細粉体を集めて、小筒体２１内に充填して集合体層２３を構成する。また、小筒体２１内に粉体を充填する際には圧力を掛けずに、小筒体２１内で粉体が自由に移動可能となるように充填する。また、細かい粉体は、１ｍｍより充分に小さな、数μｍ〜３００μｍ程度の大きさとなることが望ましい。また、ブロック層２２の材料とは異なる材料から構成することもできる。
また、小筒体２１内で、ブロック層２２、粉体の集合体層２３もいずれも充填しない部分を空気層２４とする。
ここでは、
（ア）総ての小筒体２１を粉体集合体層２３とする場合
（イ）総ての小筒体２１をブロック層２２と粉体集合体層２３とする場合
（ウ）総ての小筒体２１をブロック層２２と粉体集合体層２３と空気層２４とする場合
（エ）総ての小筒体２１をブロック層２２と空気層２４とする場合
（オ）総ての小筒体２１を粉体集合体層２３と空気層２４とする場合
（カ）総ての小筒体２１を（ア）〜（オ）のいずれかの組み合わせとする場合
（キ）いくつかの小筒体２１を空気層２４のみとし、他の小筒体２１を（カ）とする場合
が考えられる（図２）。 (4) The paper core material 20 is a material in which the small cylinders (cores) 21 and 21 are continuous, mainly made of paper or resin-processed on paper, and a material in which the cross section of the small cylinders 21 is formed into a rectangular shape is adopted. In this case, the cross section of the small cylinder 21 is arbitrary, such as a so-called hexagon (honeycomb core), a parallelogram or a rectangle (bias core), a core based on a circle, and a shape based on a straight line and a wave (Fig.). Not shown).
Further, as the porous resin block layer 22 having open cells, a block made of a phenolic resin foam is used. The block layer 22 of the foam of the phenolic resin is provided with open cells, that is, a large number of bubbles are contained therein, and the bubbles are continuous from one surface of the block layer 22 to at least the other surface facing the block layer 22. It has a structure that allows air to pass through. Therefore, in such a block layer 22, when the block layer 22 comes into contact with the water surface, water can be quickly absorbed by capillary action, and the absorbed water can be retained in the block layer 22. ..
Further, when the foam of this phenolic resin is crushed, fine powder is formed, and each powder is also porous with a large number of fine bubbles ((some or all of these bubbles also become open bubbles). However, if it is porous, only closed cells can be used.). The porous fine powder is collected and filled in the small cylinder 21 to form the aggregate layer 23. Further, when the powder is filled in the small cylinder 21, the powder is filled so that the powder can move freely in the small cylinder 21 without applying pressure. Further, the fine powder is 1 mm. It is desirable that the size is about several μm to 300 μm, which is sufficiently smaller. Further, it can be composed of a material different from the material of the block layer 22.
Further, in the small cylinder 21, the portion where neither the block layer 22 nor the powder aggregate layer 23 is filled is referred to as the air layer 24.
here,
(A) When all the small cylinders 21 are used as the powder aggregate layer 23 (B) When all the small cylinders 21 are used as the block layer 22 and the powder aggregate layer 23 (C) All When the small cylinder 21 is a block layer 22, a powder aggregate layer 23, and an air layer 24 (d) When all the small cylinders 21 are a block layer 22 and an air layer 24 (e) All small When the tubular body 21 is the powder aggregate layer 23 and the air layer 24 (f) When all the small tubular bodies 21 are any combination of (a) to (e) (g) Some small It is conceivable that the tubular body 21 is only the air layer 24 and the other small tubular body 21 is (f) (FIG. 2).

（５） このように形成した吸音装置４０は主に板状（盤状）であり、主に垂直に立てて（壁状）使用するが、水平（天井など）などの配置で使用することもできる。また、室内の事務所などの作業環境で発生する雑音（人の声など）を吸音する際に最適である。 (5) The sound absorbing device 40 formed in this way is mainly plate-shaped (board-shaped) and is mainly used vertically (wall-shaped), but can also be used in a horizontal (ceiling, etc.) arrangement. it can. It is also most suitable for absorbing noise (human voice, etc.) generated in a work environment such as an indoor office.

２．他の実施態様 2. Other embodiments

（１） 上記（ア）〜（キ）は、各層を小筒体２１の厚さ方向で層を形成したが、厚さ方向に直交する方向で層を形成することもできる（図２（ａ）（ｂ））。 (1) In the above (a) to (g), each layer is formed in the thickness direction of the small cylinder 21, but the layers can also be formed in the direction orthogonal to the thickness direction (FIG. 2 (a)). ) (B)).

（２） 前記実施態様において、遮音板３０を板材としたが、遮音性能を有する面から遮音材を構成することもできる（図示していない）。したがって、遮音性能を有するコンクリート壁の表面に、ペーパーコア材２０（小筒体２１内にブロック層２２、粉体層２３、空気層２４など適宜配置）を、フェルト状の吸音材１０を順に積層して、吸音装置４０を構成することもできる（図示していない）。
また、両面に遮音性能を有する遮音板３０の両面に、ペーパーコア材２０（小筒体２１内にブロック層２２、粉体層２３、空気層２４など適宜配置）を、フェルト状の吸音材１０を順に積層して、５層の吸音装置４０を構成することもできる（図４）。 (2) In the above embodiment, the sound insulating plate 30 is used as a plate material, but the sound insulating material can also be configured from the surface having sound insulating performance (not shown). Therefore, the paper core material 20 (the block layer 22, the powder layer 23, the air layer 24, etc. are appropriately arranged in the small cylinder 21) is laminated on the surface of the concrete wall having sound insulation performance, and the felt-like sound absorbing material 10 is laminated in order. The sound absorbing device 40 can also be configured (not shown).
Further, a felt-like sound absorbing material 10 is provided with a paper core material 20 (a block layer 22, a powder layer 23, an air layer 24, etc. are appropriately arranged in the small cylinder 21) on both sides of the sound insulating plate 30 having sound insulating performance on both sides. Can be stacked in order to form a five-layer sound absorbing device 40 (FIG. 4).

３．比較例の測定結果 3. 3. Measurement results of comparative examples

（１）試験体
フェルト状の吸音板１０ 厚さｔ１＝ ６ｍｍ
ぺーパーコア２０（バイアスコア） 厚さｔ２＝１９ｍｍ
遮音板３０（厚紙） 厚さｔ３＝ １ｍｍ
大きさ ９００ｍｍ×９００ｍｍ
ペーパーコア材２０の小筒体２１の構成は下記表のとおりである。

Figure 0006887661
(1) Specimen Felt-shaped sound absorbing plate 10 Thickness t 1 = 6 mm
Paper core 20 (bias core) Thickness t 2 = 19 mm
Sound insulation plate 30 (thick paper) Thickness t 3 = 1 mm
Size 900mm x 900mm
The configuration of the small cylinder 21 of the paper core material 20 is as shown in the table below.
Figure 0006887661


（２） 各試験体は板状であり、「９００ｍｍ×９００ｍｍ」の面を水平に配置して、試験体を挟んで上下方向で、残響室法吸音率（Ａｌｐｈａ Ｃａｂｉｎ）を測定すると、図５、図６のグラフのような結果が出た。
(2) Each test piece has a plate shape, and when the surface of "900 mm x 900 mm" is arranged horizontally and the reverberation room method sound absorption coefficient (Alpha Cabin) is measured in the vertical direction with the test piece in between, FIG. , The result shown in the graph of FIG. 6 was obtained.

（３） 図５の試験結果１によれば、試験体Ａおよび試験体Ｃでは、４００Ｈｚ〜８００Ｈｚ（低音域）での吸音率が、何も入っていない試験体Ｆに較べて、１０〜２０％の向上が認められた。また、１６００Ｈｚ〜４００Ｈｚ（中音域）では、試験体Ｆに較べて、逆に５〜１０％の吸音率の低下が見られた。また、５０００Ｈｚ以上の高音域では、試験体Ｆに較べて、吸音率の向上が見られた。
また、試験体Ｂについては、試験体Ｆに較べて、低音域、高音域での大きな向上は見られなかったが、逆に中音域での低下は見られず、全音域で、試験体Ｆに較べて吸音率が向上している。 (3) According to the test result 1 of FIG. 5, the sound absorption coefficient in the test body A and the test body C in the 400 Hz to 800 Hz (bass range) is 10 to 20 as compared with the test body F containing nothing. A% improvement was observed. Further, in the range of 1600 Hz to 400 Hz (midrange), a decrease in sound absorption coefficient of 5 to 10% was observed as compared with the test body F. Further, in the high frequency range of 5000 Hz or higher, the sound absorption coefficient was improved as compared with the test body F.
Further, with respect to the test body B, no significant improvement was observed in the bass range and the treble range as compared with the test body F, but conversely, no decrease was observed in the midrange, and the test body F was found in the entire range. The sound absorption coefficient is improved compared to.

（４） また、図６の試験結果２によれば、粉体が多くなれば（空気層が減る）、低音域での吸音率が向上し、中音域で吸音率の低下が見られた。 (4) Further, according to the test result 2 of FIG. 6, as the amount of powder increased (the air layer decreased), the sound absorption coefficient in the low frequency range improved, and the sound absorption coefficient decreased in the midrange.

（５） また、通常、多くの男性の話し声は３００〜６００Ｈｚ程度、女性の話し声は４００〜７００Ｈｚ程度になると考えられており、試験体Ａ〜Ｅのいずれも、試験体Ｆに較べて４００Ｈｚ〜８００Ｈｚ（低音域）で改善が見られている。したがって、事務所環境において使用すれば、人の話声を吸音することが期待できる。 (5) In addition, it is generally considered that many male voices are about 300 to 600 Hz and female voices are about 400 to 700 Hz, and all of the test bodies A to E are 400 Hz to higher than the test body F. Improvement is seen at 800Hz (bass). Therefore, when used in an office environment, it can be expected to absorb human voice.

（６） また、小筒体２１内に、ブロック層２２、粉体層２３、空気層２４の量を調整することにより、容易に様々な周波数に対応した吸音を実現できるので、様々な使用環境に適応した吸音装置４０を構成することが期待できる。 (6) Further, by adjusting the amounts of the block layer 22, the powder layer 23, and the air layer 24 in the small cylinder 21, sound absorption corresponding to various frequencies can be easily realized, so that various usage environments can be realized. It can be expected that the sound absorbing device 40 adapted to the above will be configured.

１０ 吸音板
２０ ペーパーコア
２１ 小筒体
２２ ブロック層
２３ 粉体層
２４ 空気層
３０ 遮音板
４０ 吸音装置 10 Sound absorbing plate 20 Paper core 21 Small cylinder 22 Block layer 23 Powder layer 24 Air layer 30 Sound insulating plate 40 Sound absorbing device

Claims (5)

フェルト状吸音板材と、多数の小筒体を備えるペーパーコア材と、遮音材とを順に積層してなる吸音装置であって、以下のように構成したことを特徴とした吸音装置。
(1) 前記ペーパーコア材は、前記小筒体の一方の開口を前記フェルト状吸音材に、他方の開口を前記遮音材側に向けて配置し、
(2) 前記多数の小筒体の両開口を結ぶ方向を厚さ方向とし、少なくとも１つの小筒体内で、厚さ方向または厚さ方向と略直角な方向に、
「多孔質の微細粉体の集合体層」、または、
「連続気泡を備える多孔質の樹脂ブロック層」および「多孔質の微細粉体の集合体層」、
を形成した。 A sound absorbing device in which a felt-shaped sound absorbing plate material, a paper core material having a large number of small cylinders, and a sound insulating material are laminated in order, and characterized by being configured as follows.
(1) In the paper core material, one opening of the small cylinder is arranged toward the felt-like sound absorbing material, and the other opening is arranged toward the sound insulating material side.
(2) the the thickness direction and a direction connecting both openings of a number of small pipes, at least one small tube body in the thickness direction or thickness towards direction substantially perpendicular,
"Aggregate layer of porous fine powder" or
"Porous resin block layer with open cells" and "Aggregate layer of porous fine powder",
Was formed. フェルト状吸音板材と、多数の小筒体を備えるペーパーコア材と、遮音材とを順に積層してなる吸音装置であって、以下のように構成したことを特徴とした吸音装置。
(1) 前記ペーパーコア材は、前記小筒体の一方の開口を前記フェルト状吸音材に、他方の開口を前記遮音材側に向けて配置し、
(2) 前記多数の小筒体の両開口を結ぶ方向を厚さ方向とし、少なくとも１つの小筒体内で、厚さ方向または厚さ方向と略直角な方向に、
「多孔質の微細粉体の集合体層」および空気層
を形成した。 A sound absorbing device in which a felt-shaped sound absorbing plate material, a paper core material having a large number of small cylinders, and a sound insulating material are laminated in order, and characterized by being configured as follows.
(1) In the paper core material, one opening of the small cylinder is arranged toward the felt-like sound absorbing material, and the other opening is arranged toward the sound insulating material side.
(2) the the thickness direction and a direction connecting both openings of a number of small pipes, at least one small tube body in the thickness direction or thickness towards direction substantially perpendicular,
An "aggregate layer of porous fine powder" and an air layer were formed. フェルト状吸音板材と、多数の小筒体を備えるペーパーコア材と、遮音材とを順に積層してなる吸音装置であって、以下のように構成したことを特徴とした吸音装置。
(1) 前記ペーパーコア材は、前記小筒体の一方の開口を前記フェルト状吸音材に、他方の開口を前記遮音材側に向けて配置し、
(2) 前記多数の小筒体の両開口を結ぶ方向を厚さ方向とし、少なくとも１つの小筒体内で、厚さ方向または厚さ方向と略直角な方向に、
「連続気泡を備える多孔質の樹脂ブロック層」、「多孔質の微細粉体の集合体層」および空気層を形成した。 A sound absorbing device in which a felt-shaped sound absorbing plate material, a paper core material having a large number of small cylinders, and a sound insulating material are laminated in order, and characterized by being configured as follows.
(1) In the paper core material, one opening of the small cylinder is arranged toward the felt-like sound absorbing material, and the other opening is arranged toward the sound insulating material side.
(2) the the thickness direction and a direction connecting both openings of a number of small pipes, at least one small tube body in the thickness direction or thickness towards direction substantially perpendicular,
"Resin blocking layer porous with open cells," to form a "porous aggregate layer of the fine powder" and air layer. フェルト状吸音板材と、多数の小筒体を備えるペーパーコア材と、遮音材とを順に積層してなる吸音装置であって、以下のように構成したことを特徴とした吸音装置。
(1) 前記ペーパーコア材は、前記小筒体の一方の開口を前記フェルト状吸音材に、他方の開口を前記遮音板側に向けて配置し、
(2) 少なくとも１つの小筒体内に連続気泡を備える多孔質の樹脂ブロック層を形成し、他の少なくとも１つの小筒体内に多孔質の微細粉体の集合体層を形成した。 A sound absorbing device in which a felt-shaped sound absorbing plate material, a paper core material having a large number of small cylinders, and a sound insulating material are laminated in order, and characterized by being configured as follows.
(1) In the paper core material, one opening of the small cylinder is arranged with the felt-like sound absorbing material, and the other opening is arranged with the sound insulating plate side.
(2) A porous resin block layer having open cells was formed in at least one small cylinder, and an aggregate layer of porous fine powder was formed in at least one other small cylinder. 「連続気泡の微細空間を備える樹脂ブロック層」をフェノール系樹脂のブロック状発泡体とし、
「多孔質の微細粉体の集合体層」をフェノール系樹脂のブロック状発泡体を粉砕して形成したことを特徴とする請求項１〜請求項４のいずれか１項に記載の吸音装置。 The "resin block layer having a fine space of open cells" is made into a block-shaped foam of phenolic resin.
The sound absorbing device according to any one of claims 1 to 4 , wherein the "aggregate layer of porous fine powder" is formed by pulverizing a block-shaped foam of a phenolic resin.
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