JP5384201B2

JP5384201B2 - Sound absorption panel

Info

Publication number: JP5384201B2
Application number: JP2009131821A
Authority: JP
Inventors: 久晃小林; 靖宏鈴木; 浩牧野
Original assignee: Inoac Corp
Current assignee: Inoac Corp
Priority date: 2009-06-01
Filing date: 2009-06-01
Publication date: 2014-01-08
Anticipated expiration: 2029-06-01
Also published as: JP2010277017A

Description

本発明は、両面が開口した格子状構造体の表面に非通気性のシート材が積層された吸音材に関する。 The present invention relates to a sound-absorbing material in which a non-breathable sheet material is laminated on the surface of a lattice-like structure that is open on both sides.

従来、低中周波数域の騒音対策として、穴あき板や膜材料による共鳴で吸音率を向上させる方法がある（特許文献１，２，３）。しかし、この方法は吸音率が低かったり、構造上の強度に劣ったりするなどの問題がある。 Conventionally, there is a method of improving the sound absorption rate by resonance with a perforated plate or a membrane material as a countermeasure against noise in the low and medium frequency ranges (Patent Documents 1, 2, and 3). However, this method has problems such as low sound absorption rate and poor structural strength.

また、三角、四角、六角（ハニカム）、八角、あるいは円形の立体構造体からなる格子状構造体は、軽量で剛性を有することから構造体として使用されているが、吸音特性（整流効果）を有することも知られている。この格子状構造体の前面に直接多孔質吸音材を配置することで、格子状構造体のその整流効果と背後空気層効果により、多孔質吸音材の高周波数対応吸音性を中周波数域の範囲まで向上させることが提案されている（特許文献４，５，６）。しかし、この構造によっては、５００Ｈｚ以下の低周波数域になると、格子状構造体の厚みを５０ｍｍ以上の厚いものにしなければ吸音性の向上効果が得られなくなる問題がある。 In addition, a lattice-like structure made of a triangular, square, hexagonal (honeycomb), octagonal, or circular three-dimensional structure is used as a structure because it is lightweight and rigid, but has a sound absorption characteristic (rectifying effect). It is also known to have. By arranging the porous sound absorbing material directly on the front surface of this lattice structure, the high frequency response sound absorption property of the porous sound absorbing material is in the middle frequency range by the rectification effect and the back air layer effect of the lattice structure. (Patent Documents 4, 5, and 6) have been proposed. However, depending on this structure, there is a problem that the sound absorption improvement effect cannot be obtained unless the thickness of the lattice structure is increased to 50 mm or more in a low frequency range of 500 Hz or less.

また、板材と格子状構造体の接着一体化によりサンドイッチパネルにしたものも提案されている（特許文献７，８）。しかし、この構造のものは、吸音材としての性能に劣ることから、主に遮音材として用いられている。 In addition, a sandwich panel made by bonding and integrating a plate material and a lattice structure has been proposed (Patent Documents 7 and 8). However, since this structure is inferior in performance as a sound absorbing material, it is mainly used as a sound insulating material.

また、板状体の周辺に振動減衰部材（制振材）を介して取付け部を枠状に取付け、その枠を剛性の板部材に固定したものも提案されている（特許文献９）。しかし、この構造のものは、５００Ｈｚ以下の低周波数域で良好な吸音性が得られなかったり、厚みが大になったりする問題がある。 There has also been proposed a structure in which an attachment portion is attached in a frame shape around a plate-like body via a vibration damping member (damping material), and the frame is fixed to a rigid plate member (Patent Document 9). However, this structure has a problem that good sound-absorbing property cannot be obtained in a low frequency range of 500 Hz or less, and the thickness becomes large.

特開平３−２９３４０９号公報JP-A-3-293409 特開平６−８３３６５号公報JP-A-6-83365 特開２００６−３２３２０４号公報JP 2006-323204 A 特開２００５−２４７２３５号公報JP 2005-247235 A 特開２００５−１７６３６号公報JP 2005-17636 A 特開昭６４−３２９４３号公報JP-A-64-32943 特開平８−１５１７０４号公報JP-A-8-151704 特開２００５−２５４４７８号公報JP 2005-254478 A 特開２００５−１３４６５３号公報JP 2005-134653 A

本発明は前記の点に鑑みなされたものであって、５００Ｈｚ前後以下の低周波数域において吸音率を高くすることができ、かつ厚みを薄くすることができる吸音パネルの提供を目的とする。 The present invention has been made in view of the above points, and an object of the present invention is to provide a sound absorbing panel capable of increasing the sound absorption coefficient in a low frequency range of about 500 Hz or less and reducing the thickness.

請求項１の発明は、両面が開口した板状の格子状構造体の少なくとも片面に非通気性のシート材を配置した吸音パネルにおいて、前記格子状構造体は外周部よりも内側に隔壁によって区画された複数のセルを有し、前記非通気性のシート材を前記格子状構造体の外周部と該外周部よりも内側の隔壁の複数箇所に固定すると共に、前記格子状構造体の外周部よりも内側部分については、前記非通気性のシート材における少なくとも一辺１０ｃｍの正方形が含まれる部分を該部分に位置する前記格子状構造体の隔壁に対して非固定にしたことを特徴とする。 The invention according to claim 1 is a sound-absorbing panel in which a non-breathable sheet material is disposed on at least one side of a plate-like lattice structure having both sides opened, and the lattice structure is partitioned by a partition inside the outer peripheral portion. A plurality of formed cells, and the non-breathable sheet material is fixed to the outer peripheral portion of the lattice-like structure and a plurality of partitions on the inner side of the outer peripheral portion, and the outer peripheral portion of the lattice-like structure The inner portion of the non-breathable sheet material is characterized in that a portion including a square of at least 10 cm on a side is not fixed to the partition wall of the lattice structure located in the portion.

請求項２の発明は、請求項１における前記格子状構造体は、セルの平面形状が多角形あるいは円形からなると共に、各セルの高さが１０〜１００ｍｍであることを特徴とする。 According to a second aspect of the present invention, the lattice structure according to the first aspect is characterized in that the planar shape of the cell is a polygon or a circle, and the height of each cell is 10 to 100 mm.

請求項３の発明は、請求項１又は２における前記非通気性のシート材は、面密度が０．０５〜２．０ｋｇ／ｍ^２であることを特徴とする。 The invention of claim 3 is characterized in that the non-breathable sheet material of claim 1 or 2 has a surface density of 0.05 to 2.0 kg / m ² .

本発明によれば、非通気性のシート材を格子状構造体の外周部と該外周部よりも内側の隔壁の複数箇所に固定すると共に、前記非通気性のシート材における前記格子状構造体の外周部よりも内側部分については、非通気性のシート材における少なくとも一辺１０ｃｍの正方形が含まれる部分を該部分に位置する前記格子状構造体の隔壁に対して非固定にしたことにより、５００Ｈｚ前後以下の低周波数域において吸音率を高くすることができ、かつ吸音パネルの厚みを薄くすることができる。 According to the present invention, the air-permeable sheet material is fixed to a plurality of locations on the outer peripheral portion of the lattice-like structure and the partition walls on the inner side of the outer peripheral portion, and the lattice-like structure in the non-breathable sheet material is provided. With respect to the inner part of the outer peripheral part, a part including a square of at least 10 cm on a side in the non-breathable sheet material is not fixed with respect to the partition wall of the lattice-like structure located in the part. It is possible to increase the sound absorption rate in the low frequency range below and before and to reduce the thickness of the sound absorption panel.

本発明の第１実施形態に係る吸音パネルの平面図である。It is a top view of the sound absorption panel concerning a 1st embodiment of the present invention. 図１の２−２断面図である。It is 2-2 sectional drawing of FIG. 図１の３−３断面図である。FIG. 3 is a 3-3 cross-sectional view of FIG. 1. 第１実施形態の格子状構造体の平面図である。It is a top view of the lattice-like structure of a 1st embodiment. 第１実施形態における外周部の固定方法における他例を示す図である。It is a figure which shows the other example in the fixing method of the outer peripheral part in 1st Embodiment. 第１実施形態における外周部内側の固定部における他例を示す図である。It is a figure which shows the other example in the fixing | fixed part inside the outer peripheral part in 1st Embodiment. 第１実施形態における外周部内側の固定部におけるさらに他の例を示す図である。It is a figure which shows the further another example in the fixing | fixed part inside the outer peripheral part in 1st Embodiment. 本発明の第２実施形態に係る吸音パネルの平面図である。It is a top view of the sound absorption panel concerning a 2nd embodiment of the present invention. 図８の９−９断面図である。It is 9-9 sectional drawing of FIG. 第２実施形態の格子状構造体の平面図である。It is a top view of the lattice-like structure of a 2nd embodiment. 第２実施形態における外周部の固定方法における他例を示す図である。It is a figure which shows the other example in the fixing method of the outer peripheral part in 2nd Embodiment. 第２実施形態における外周部内側の固定部における他例を示す図である。It is a figure which shows the other example in the fixing | fixed part inside the outer peripheral part in 2nd Embodiment. 実施例１の固定方法を示す図である。3 is a diagram illustrating a fixing method of Example 1. FIG. 実施例２の固定方法を示す図である。6 is a diagram illustrating a fixing method of Example 2. FIG. 実施例４の固定方法を示す図である。FIG. 6 is a diagram showing a fixing method of Example 4. 実施例１、２、４参考例３及び比較例１〜３の吸音率測定結果を示すグラフである。It is a graph which shows the sound absorption coefficient measurement result of Example 1 , 2, 4 reference example 3, and Comparative Examples 1-3. 参考例５〜７及び比較例４〜６の吸音率測定結果を示すグラフである。It is a graph which shows the sound absorption coefficient measurement result of Reference Examples 5-7 and Comparative Examples 4-6. 参考例８〜１２及び比較例７の吸音率測定結果を示すグラフである。It is a graph showing the sound absorption rate measurement results of Reference Examples 8-12 and Comparative Example 7.

以下、本発明の吸音パネルにについて、図面を用いて説明する。図１から図３に示す第１実施形態の吸音パネル１０Ａは、両面が開口した板状の格子状構造体１１Ａの少なくとも片面に非通気性のシート材２１Ａが配置されている。なお、図示の例では、格子状構造体１１Ａの両面（両側の格子面）に非通気性のシート材２１Ａが配置されている。前記吸音パネル１０Ａの一方の面は吸音面（音源側へ向けられる面）であり、反対面は裏面である。前記格子状構造体１１Ａの両面に設けられた非通気性のシート材２１Ａについて吸音面側と裏面側を区別する場合、吸音面側の非通気性シート材については２１０Ａとし、反対の裏面側の非通気性シート材については２１１Ａとする。 The sound absorbing panel of the present invention will be described below with reference to the drawings. In the sound absorbing panel 10A of the first embodiment shown in FIGS. 1 to 3, a non-breathable sheet material 21A is arranged on at least one side of a plate-like lattice-like structure 11A having both sides opened. In the illustrated example, non-breathable sheet materials 21A are arranged on both surfaces (lattice surfaces on both sides) of the lattice structure 11A. One surface of the sound absorbing panel 10A is a sound absorbing surface (surface directed toward the sound source side), and the opposite surface is a back surface. When the sound-absorbing sheet side 21A provided on both surfaces of the lattice structure 11A is distinguished from the sound-absorbing surface side and the back surface side, the sound-absorbing surface-side non-breathable sheet material is 210A, The non-breathable sheet material is 211A.

前記格子状構造体１１Ａは、図４に示すように隔壁１２Ａによって区画された複数のセル１５Ａを有し、前記セル１５Ａが高さ方向（すなわち格子状構造体の厚み方向）の両端で開口している。前記格子状構造体１１Ａは、セルの平面形状が本実施形態のように多角形（図の例では四角形）または円形（図示せず）からなる。平面形状が多角形のセルとしては、図示のような四角形の他に、三角形、五角形、図１０に示すような六角形（ハニカム）、八角形（図示せず）等がある。特に製造のし易さからは、各セルの平面形状が四角形、三角形、又は六角形（ハニカム）のものが、前記格子状構造体１１Ａとして好ましい。 As shown in FIG. 4, the lattice-like structure 11A has a plurality of cells 15A partitioned by partition walls 12A, and the cells 15A open at both ends in the height direction (that is, the thickness direction of the lattice-like structure). ing. In the lattice-like structure 11A, the planar shape of the cell is a polygon (rectangle in the example of the figure) or a circle (not shown) as in the present embodiment. The cells having a polygonal planar shape include a triangle, a pentagon, a hexagon (honeycomb) as shown in FIG. 10, an octagon (not shown) and the like in addition to the quadrangle as shown. In particular, from the viewpoint of ease of production, it is preferable that the planar shape of each cell is a quadrangle, triangle, or hexagon (honeycomb) as the lattice-like structure 11A.

セルの高さ（格子状構造体１１Ａの厚み）ｈについては、低くなりすぎると（格子状構造体１１Ａの厚みが薄くなりすぎると）、吸音パネルの良好な吸音領域が高周波数領域へシフトして５００Ｈｚ以下の低周波数領域における吸音性が低下するようになる。一方、セルの高さが高すぎると（格子状構造体１１Ａの厚みが厚くなりすぎると）、格子状構造体１１Ａの強度低下を生じるようになる。このことから、セルの高さ（格子状構造体１１Ａの厚み）は、１０〜１００ｍｍの範囲が好ましい。より好ましく１５〜５０ｍｍの高さ（格子状構造体１１Ａの厚み）である。 If the cell height (thickness of the lattice-like structure 11A) h becomes too low (if the thickness of the lattice-like structure 11A becomes too thin), the good sound absorption region of the sound absorbing panel shifts to the high frequency region. Therefore, sound absorption in a low frequency region of 500 Hz or less is lowered. On the other hand, when the height of the cell is too high (when the thickness of the lattice-like structure 11A becomes too thick), the strength of the lattice-like structure 11A is reduced. For this reason, the height of the cell (thickness of the lattice structure 11A) is preferably in the range of 10 to 100 mm. More preferably, the height is 15 to 50 mm (the thickness of the lattice structure 11A).

各セルのサイズは、小さすぎると格子状構造体１１Ａの開口率が下がって吸音パネルの吸音性の低下を生じ、一方、大きすぎると格子状構造体１１Ａの強度低下を生じたり、吸音パネルの良好な吸音領域が高周波数領域へシフトしたりするため、８〜６０ｍｍが好ましい。なお、セルサイズとは、セルにおける格子間の寸法をいい、多角形では向かい合う格子の辺または角の平均寸法であり、円形では内周の直径をいう。格子状構造体１１Ａの材質としては、プラスチック、紙、金属等を挙げることができるが、セラミッなどの不燃紙で格子状構造体１１Ａを構成すれば、吸音パネルの不燃性や難燃性を高めることができ、不燃認定の必要な分野にも好適な吸音パネルとすることができる。 If the size of each cell is too small, the aperture ratio of the grid-like structure 11A is lowered, and the sound absorption of the sound-absorbing panel is lowered. On the other hand, if the size is too large, the strength of the grid-like structure 11A is reduced. Since a good sound absorption region shifts to a high frequency region, 8 to 60 mm is preferable. The cell size refers to the dimension between the grids in the cell. In a polygon, it is the average dimension of the sides or corners of the grid facing each other. In the circle, it refers to the inner circumference diameter. Examples of the material of the lattice structure 11A include plastic, paper, metal, etc. If the lattice structure 11A is made of non-combustible paper such as ceramic, the non-combustibility and flame retardancy of the sound absorbing panel are enhanced. Therefore, it is possible to provide a sound-absorbing panel suitable for a field requiring non-combustibility certification.

前記非通気性のシート材２１Ａは、非通気性の材質であればよく、特に限定されない。非通気性の材質としては、ポリプロピレン、ポリエチレン、ポリスチレン、ポリアミド樹脂、塩化ビニル、ポリウレタン、スチレンゴム、シリコンゴム、ポリカーボネート、ＡＢＳ樹脂、ポリアクリロニトリル、ポリメタクリル酸メチル等の樹脂、およびこれらの材質の独立気泡構造を持つ非通気性の発泡シート、アルミ、鉄、銅、ステンレスなどの金属製フイルム、紙、セラミックス不燃紙などが挙げられる。前記シート材２１Ａを前記格子状構造体１１Ａと共に不燃紙（例えばセオピライトを主成分とするもの）で構成すれば、吸音パネル１０Ａの不燃性や難燃性を一層良好にすることができる。また、前記非通気性のシート材２１Ａは、面密度（面重量）が低すぎると、前記吸音パネル１０Ａにおいて吸音率がピークとなるピーク周波数が高周波数側にずれ、しかも吸音率が低くなる。逆に面密度が高すぎると、ピーク周波数が低周波数側にずれるものの、吸音率は低くなる。そのため、前記シート材２１Ａの好ましい面密度は、０．０５〜２．０ｋｇ／ｍ^２である。なお、面密度とは、単位面積当たりに占める物の重さを表す単位として定義されている。単位は、ｋｇ／ｍ^２、ｇ／ｃｍ^２などである。対象物の密度（ｇ／ｃｍ^３）に厚さ（ｃｍ）を掛けたもの The non-breathable sheet material 21A is not particularly limited as long as it is a non-breathable material. Non-breathable materials include polypropylene, polyethylene, polystyrene, polyamide resin, vinyl chloride, polyurethane, styrene rubber, silicon rubber, polycarbonate, ABS resin, polyacrylonitrile, polymethyl methacrylate, and other materials. Non-breathable foam sheets having a cellular structure, metal films such as aluminum, iron, copper, and stainless steel, paper, ceramic non-combustible paper, and the like. If the sheet material 21A is made of non-combustible paper (for example, the main component of theophyllite) together with the lattice structure 11A, the non-flammability and flame retardancy of the sound absorbing panel 10A can be further improved. Further, if the surface density (surface weight) of the non-breathable sheet material 21A is too low, the peak frequency at which the sound absorption coefficient peaks in the sound absorption panel 10A is shifted to the high frequency side, and the sound absorption coefficient becomes low. On the other hand, if the surface density is too high, the sound absorption coefficient is lowered although the peak frequency is shifted to the low frequency side. Therefore, a preferable surface density of the sheet material 21A is 0.05 to 2.0 kg / m ² . The areal density is defined as a unit representing the weight of an object per unit area. The unit is kg / m ² , g / cm ² or the like. Thickness (cm) multiplied by the density (g / cm ³ ) of the object

前記吸音面側の非通気性のシート材２１０Ａは、前記格子状構造体１１Ａの少なくとも外周部１７Ａに固定されると共に、前記格子状構造体１１Ａにおける外周部１７Ａよりも内側部分（すなわち外周部１７Ａで包囲される部分）１９Ａについては、非通気性のシート材２１Ａにおける少なくとも一辺１０ｃｍの正方形が含まれる部分を格子状構造体１１Ａに対して非固定とされている。前記非通気性のシート材２１０Ａは、前記格子状構造体１１Ａの外周部１７Ａを十分に覆って該外周部１７Ａに固着固定されていないと共鳴による吸音性が十分に得られず、良好な吸音領域が高周波数域へシフトするばかりでなく、吸音率も幾分低下するようになる。そのため、前記シート材２１０Ａの前記格子状構造体１１Ａへの固定は、少なくとも前記格子状構造体１１Ａにおける外周部１７Ａの全周で行うのが好ましい。なお、前記裏面側の非通気性シート材２１１Ａにおける格子状構造体１１Ａに対する固定は、前記吸音面側の非通気性シート材２１０Ａと同様に格子状構造体１１Ａの少なくとも外周部１７Ａに固定されるのが好ましいが、格子状構造体１１Ａの全面に固定してもよい。図示の例では前記裏面側の非通気性のシート材２１１Ａは、前記格子状構造体１１Ａの外周部１７Ａの全周にのみ接着固定されている。 The non-breathable sheet material 210A on the sound absorbing surface side is fixed to at least the outer peripheral portion 17A of the lattice-like structure 11A, and is located on the inner side of the outer peripheral portion 17A (that is, the outer peripheral portion 17A) 19A), a portion including a square of at least 10 cm on a side in the non-breathable sheet material 21A is not fixed to the lattice structure 11A. If the non-breathable sheet material 210A sufficiently covers the outer peripheral portion 17A of the lattice-like structure 11A and is not fixedly fixed to the outer peripheral portion 17A, sufficient sound absorption by resonance is not obtained, and good sound absorption is achieved. Not only does the region shift to the high frequency region, but also the sound absorption rate decreases somewhat. For this reason, it is preferable that the sheet material 210A is fixed to the lattice structure 11A at least on the entire circumference of the outer peripheral portion 17A of the lattice structure 11A. In addition, the non-breathable sheet material 211A on the back surface side is fixed to the lattice-shaped structure 11A in the same manner as the non-breathable sheet material 210A on the sound-absorbing surface side. However, it may be fixed to the entire surface of the lattice structure 11A. In the illustrated example, the non-breathable sheet material 211A on the back surface side is bonded and fixed only to the entire periphery of the outer peripheral portion 17A of the lattice structure 11A.

なお、前記格子状構造体１１Ａの外周部１７Ａとは、連なった格子の最外周を含む部分であり、格子（セル）内方にある程度の面積はみ出している場合もある。また、格子状構造体が、製造上の点から外周が連なっていない紙、金属、不燃紙などから構成されている場合には、最外周からはみ出した部分も外周部に含まれる。 The outer peripheral portion 17A of the lattice-like structure 11A is a portion including the outermost periphery of the continuous lattice, and there is a case where a certain amount of area protrudes inside the lattice (cell). Further, when the lattice structure is made of paper, metal, non-combustible paper, or the like whose outer periphery is not continuous from the viewpoint of manufacturing, a portion protruding from the outermost periphery is also included in the outer peripheral portion.

また、前記外周部１７Ａに対するシート材２１Ａの固定は、図示の例では、吸音面側となる一方のシート材２１０Ａについては、前記外周部１７Ａの側面１７１Ａに接着剤でシート材２１Ａの縁２２Ａを固定することにより行われている。これにより、前記外周部１７Ａの高さ方向端面では前記シート材２１０Ａを非接着にすることができ、前記シート材２１０Ａの膜振動による吸音性を一層向上させることができる。なお、前記外周部１７Ａに対するシート材２１０Ａのその他の固定方法としては、図５の（５−Ａ）に示すように外周部１７Ａの側面１７１Ａを巻き込むようにして接着材でシート材の縁２２Ａを固定する方法や、（５−Ｂ）のように、断面コの字をしたレール状の固定部品３１Ａを、前記格子状構造体１１Ａの外周部１７Ａにおける側面１７１Ａにシート材２１０Ａの縁を挟んで嵌着する方法や、（５−Ｃ）のように、前記シート材２１０Ａの縁２２Ａを格子状構造体１１Ａの外周部１７Ａの高さ方向端部に接着する方法、さらに（５−Ｄ）のように、断面Ｌの字をした接着剤または粘着剤付きのレール状の固定部品３２Ａを、前記格子状構造体１１Ａの外周部１７Ａにおける側面１７１Ａとシート材の縁２２Ａの上部から接着する方法等を挙げることができる。なお、固定部材３１Ａ,３２Ａは、柔軟材料でもよく、固定した結果、それぞれコの字、Ｌの字になるものでもよい。以上の具体例に限らず、固定方法としては、接着・粘着（接着剤。粘着剤、両面テープなど）、溶着・融着（高周波または超音波融着など）、圧着など公知の方法を用いてよい。 Further, in the illustrated example, the sheet material 21A is fixed to the outer peripheral portion 17A. For one sheet material 210A on the sound absorbing surface side, the edge 22A of the sheet material 21A is bonded to the side surface 171A of the outer peripheral portion 17A with an adhesive. It is done by fixing. Thereby, the sheet material 210A can be made non-bonded at the height direction end surface of the outer peripheral portion 17A, and the sound absorption due to the membrane vibration of the sheet material 210A can be further improved. As another method for fixing the sheet material 210A to the outer peripheral portion 17A, as shown in FIG. 5 (5-A), the side surface 171A of the outer peripheral portion 17A is wound around the edge 22A of the sheet material with an adhesive. A method of fixing, or a rail-shaped fixing part 31A having a U-shaped cross-section as in (5-B), with the edge of the sheet material 210A sandwiched between the side surface 171A of the outer peripheral portion 17A of the lattice structure 11A A method of fitting, a method of adhering the edge 22A of the sheet material 210A to the end in the height direction of the outer peripheral portion 17A of the lattice structure 11A, as in (5-C), and a method of (5-D) As described above, a method of adhering a rail-like fixed part 32A with an adhesive or adhesive having a cross-section L from the side surface 171A of the outer peripheral portion 17A of the lattice structure 11A and the upper portion of the edge 22A of the sheet material, etc. It can be mentioned. Note that the fixing members 31A and 32A may be made of a flexible material, and may be U-shaped or L-shaped as a result of fixing. The fixing method is not limited to the above specific examples, and the fixing method may be a known method such as adhesion / adhesion (adhesive, adhesive, double-sided tape, etc.), welding / fusion (high frequency or ultrasonic fusion, etc.), and pressure bonding. Good.

前記格子状構造体１１Ａの大きさによっては、前記格子状構造体１１Ａの外周部１７Ａのみにおける固定では、強度が不十分であったり、また前記シート材２１０Ａの中央付近が格子状構造体１１Ａの表面から浮き上がって破損し易くなったりする等の不具合が生じることがある。その場合には、前記外周部１７Ａよりも内側部分１９Ａにおいても格子状構造体１１Ａに前記シート材２１０Ａを固定するのが好ましい。しかし、前記シート材２１０Ａは、前記格子状構造体１１Ａの外周部１７Ａよりも内側において、前記格子状構造体１１Ａとの固定面積（固着面積）が広くなるほど、即ち、非固定面積が狭くなるに従い、吸音率の低下や高周波数域へ吸音性がシフトして吸音性能が低下するようになる。そのため、前記格子状構造体１１Ａにおける外周部１７Ａよりも内側部分１９Ａについては、前記非通気性のシート材２１０Ａにおける少なくとも一辺１０ｃｍの正方形が含まれる部分２３Ａを、前記格子状構造体１１Ａに対して非固定にする必要がある。図示の例では、前記格子状構造体１１Ａの外周部１７Ａの内側に点状の固定部（内側固定部）１８Ａが６箇所設けられ、該固定部１８Ａで前記シート材２１０Ａが格子状固定部１１Ａに接着固定されている。また、図示の例では、前記固定部（内側固定部）１８Ａ間の距離ｄ１及び前記固定部（内側固定部）１８Ａと外周固定部に相当する前記外周部１７Ａ間の距離ｄ２は、何れも１００ｍｍより大とされ、これによって前記シート材２１Ａにおいて、少なくとも一辺１０ｃｍの正方形が含まれる部分２３Ａを格子状構造体１１Ａに対して非固定にしている。 Depending on the size of the grid-like structure 11A, the fixing of only the outer peripheral portion 17A of the grid-like structure 11A may not be sufficient in strength, or the center of the sheet material 210A may be located near the center of the grid-like structure 11A. Problems such as rising from the surface and being easy to break may occur. In that case, it is preferable to fix the sheet material 210A to the lattice structure 11A also in the inner portion 19A of the outer peripheral portion 17A. However, the sheet material 210A has a larger fixed area (fixed area) with the grid structure 11A inside the outer peripheral portion 17A of the grid structure 11A, that is, as the non-fixed area becomes smaller. As a result, the sound absorption performance is deteriorated due to a decrease in sound absorption rate and a shift in sound absorption to a high frequency range. Therefore, for the inner portion 19A of the outer periphery 17A of the lattice structure 11A, a portion 23A including at least a 10 cm side square in the non-breathable sheet material 210A is disposed with respect to the lattice structure 11A. Must be unfixed. In the illustrated example, six dot-shaped fixing portions (inner fixing portions) 18A are provided inside the outer peripheral portion 17A of the lattice-like structure 11A, and the sheet material 210A is provided in the lattice-like fixing portion 11A at the fixing portions 18A. It is fixed to the adhesive. In the illustrated example, the distance d1 between the fixed portions (inner fixed portions) 18A and the distance d2 between the fixed portions (inner fixed portions) 18A and the outer peripheral portions 17A corresponding to the outer peripheral fixed portions are both 100 mm. Accordingly, in the sheet material 21A, the portion 23A including at least a square having a side of 10 cm is not fixed to the lattice structure 11A.

また、前記格子状構造体１１Ａにおける外周部１７Ａよりも内側の固定部１８Ａは、図１及び図４に示すような点状に限られず、図６に示す固定部１８１Ａあるいは１８２Ａの何れか一方のような直線状であってもよく、あるいは固定部１８１Ａ及び１８２Ａの両方からなる格子状であってもよく、または図７に示す固定部１８３Ａ，１８４Ａのような格子に沿った所定長のものであってもよい。 Further, the fixing portion 18A on the inner side of the outer peripheral portion 17A in the lattice-like structure 11A is not limited to the dot shape as shown in FIGS. 1 and 4, and one of the fixing portions 181A and 182A shown in FIG. It may be a straight line shape as described above, or may be a lattice shape composed of both the fixing portions 181A and 182A, or a predetermined length along the lattice such as the fixing portions 183A and 184A shown in FIG. There may be.

図８及び図９に示す第２実施形態の吸音パネル１０Ｂは、前記第１実施形態の格子状構造体１１Ａに代えて図１０に示すような平面形状が六角形（ハニカム）の格子状構造体１１Ｂを用いたものである。図示の格子状構造体１１Ｂは、平面形状が四角形からなる枠状の外周部１７Ｂの内側に、隔壁１２Ｂによって区画された六角形（ハニカム）のセル（格子）１５Ｂが複数連結して形成されたものである。なお、前記格子状構造体１１Ｂは、六角形のセル（格子）１５Ｂの一部が外周部１７Ｂを構成して前記外周の枠状部分がないものであってもよい。前記吸音パネル１０Ｂにおける、前記格子状構造体１１Ｂ以外の構成は、前記第１実施形態の吸音パネル１０Ａと同様であり、前記非通気性のシート材２１Ｂは、縁２２Ｂが前記格子状構造体１１Ｂの外周部１７Ｂの側面１７１Ｂに接着固定されている。なお、前記格子状構造体１１Ｂの両面に設けられたシート２１Ｂは、一方のシート材２１０Ｂが吸音面側のシート材であり、他方のシート材２１１Ｂが裏面側のシート材である。 The sound absorbing panel 10B of the second embodiment shown in FIGS. 8 and 9 is a lattice-like structure having a hexagonal (honeycomb) planar shape as shown in FIG. 10 instead of the lattice-like structure 11A of the first embodiment. 11B is used. The illustrated lattice-like structure 11B is formed by connecting a plurality of hexagonal (honeycomb) cells (grids) 15B partitioned by partition walls 12B inside a frame-shaped outer peripheral portion 17B having a square planar shape. Is. The lattice structure 11B may have a hexagonal cell (lattice) 15B part of the outer peripheral portion 17B and no outer peripheral frame portion. The structure of the sound absorbing panel 10B other than the lattice structure 11B is the same as that of the sound absorbing panel 10A of the first embodiment, and the non-breathable sheet material 21B has an edge 22B having the lattice structure 11B. The outer peripheral portion 17B is bonded and fixed to the side surface 171B. In addition, as for the sheet | seat 21B provided in both surfaces of the said grid | lattice structure 11B, one sheet material 210B is a sheet material by the side of a sound absorption surface, and the other sheet material 211B is a sheet material by the back side.

前記格子状構造体１１Ｂの外周部１７Ｂに対するシート材２１Ｂの他の固定方法としては、図１１の（１１−Ａ）に示すように外周部１７Ｂの側面１７１Ｂを巻き込むようにしてシート材の縁２２Ｂを接着材で固定する方法や、（１１−Ｂ）のように、断面コの字をしたレール状の固定部品３１Ｂを、前記格子状構造体１１Ｂの外周部１７Ｂの側面１７１Ｂにシート材２１Ｂの縁を挟んで嵌着する方法や、（１１−Ｃ）のように、前記シート材２１Ｂの縁２２Ｂを格子状構造体１１Ｂにおける外周部１７Ｂの高さ方向端部に接着する方法、さらに（１１−Ｄ）のように、断面Ｌの字をした接着剤または粘着剤付きのレール状の固定部品３２Ｂを、前記格子状構造体１１Ｂの外周部１７Ｂにおける側面１７１Ｂとシート材の縁２２Ｂの上部から接着する方法等を挙げることができる。 As another fixing method of the sheet material 21B with respect to the outer peripheral portion 17B of the lattice-like structure 11B, as shown in FIG. 11 (11-A), the side surface 171B of the outer peripheral portion 17B is wound around the edge 22B of the sheet material. And a rail-shaped fixing part 31B having a U-shaped cross section as shown in (11-B) is attached to the side surface 171B of the outer peripheral portion 17B of the lattice structure 11B. A method of fitting with the edge sandwiched, a method of adhering the edge 22B of the sheet material 21B to the end in the height direction of the outer peripheral portion 17B in the lattice structure 11B, as in (11-C), and (11 -D), the rail-shaped fixed part 32B with the adhesive or pressure-sensitive adhesive having a cross-section L is formed from the side surface 171B and the upper part of the edge 22B of the sheet material on the outer peripheral portion 17B of the lattice-like structure 11B. Mention may be made to wear the method and the like.

また、前記格子状構造体１１Ｂの外周部１７Ｂよりも内側の部分には、前記シート材２１Ｂが６箇所の固定部１８Ｂで接着固定されている。また、固定部（内側固定部）１８Ｂ間の距離ｄ３及び前記固定部（内側固定部）１８Ｂと外周固定部に相当する前記外周部１７Ｂ間の距離ｄ４は、何れも１００ｍｍより大とされ、これによって前記シート材２１Ｂにおいて、少なくとも一辺１０ｃｍの正方形が含まれる部分２３Ｂを格子状構造体１１Ａに対して非固定にしている。前記格子状構造体１１Ｂにおける外周部１７Ｂよりも内側部分の固定部１８Ｂは、図８及び１０に示すような点状に限られず、図１２に示す固定部１８１Ｂのように格子に沿って所定長のもので構成してもよい。 In addition, the sheet material 21B is bonded and fixed to the inner side of the outer peripheral portion 17B of the lattice structure 11B with six fixing portions 18B. Further, the distance d3 between the fixed portions (inner fixed portions) 18B and the distance d4 between the fixed portion (inner fixed portions) 18B and the outer peripheral portion 17B corresponding to the outer peripheral fixed portion are both greater than 100 mm. Thus, in the sheet material 21B, a portion 23B including at least a square having a side of 10 cm is not fixed to the lattice structure 11A. The fixed portion 18B inside the outer peripheral portion 17B of the lattice-like structure 11B is not limited to the dot shape as shown in FIGS. 8 and 10, but has a predetermined length along the lattice as the fixed portion 181B shown in FIG. You may comprise.

なお、前記第１及び第２実施形態の吸音パネル１０Ａ，１０Ｂにおいて、前記格子状構造体１１Ａ，１１Ｂの両面に設けた非通気性のシート材２１Ａは、吸音面側のシート材のみを前記外周部よりも内側の固定方法で格子状構造体１１Ａ，１１Ｂに固定し、裏面側のシート材については前記格子状構造体１１Ａ，１１Ｂの全面に接着固定してもよい。また、前記格子状構造体１１Ａ，１１Ｂの吸音面側のみに前記非通気性のシート材２１Ａを設け、反対の裏面側については、この吸音パネル１０Ａ，１０Ｂが取り付けられる壁面等で塞いでもよい。 In the sound absorbing panels 10A and 10B of the first and second embodiments, the non-breathable sheet material 21A provided on both surfaces of the lattice-like structures 11A and 11B includes only the sound absorbing surface side sheet material on the outer periphery. It may be fixed to the grid structures 11A and 11B by a fixing method inside the portion, and the sheet material on the back side may be bonded and fixed to the entire surface of the grid structures 11A and 11B. Further, the non-breathable sheet material 21A may be provided only on the sound absorption surface side of the lattice-like structures 11A and 11B, and the opposite back surface side may be closed with a wall surface to which the sound absorption panels 10A and 10B are attached.

・実施例１
三角状格子からなる格子状構造体（日本ダイスコア社製、紙製、セル径１０ｍｍ、６００×９００ｍｍ、高さ２０ｍｍ）を用い、格子状構造体の吸音面については、非通気性のシート材として同サイズのポリプロピレンフイルム（１ｍｍ厚、面密度０．９ｋｇ／ｍ^２）を、両面接着テープ（ニトムズ社製、ポリエチレン・ポリプロピレン用超強力両面テープ、２０ｍｍ幅、０．１２ｍｍ厚）により、格子状構造体の外周部及び外周部よりも内側の６箇所（各２０ｍｍ角）に、図１３に示す間隔で接着した。格子状構造体の外周部よりも内側における非固着固定部のサイズは、対角線状に２６０ｍｍ角である。格子状構造体の裏面については、同様なポリプロピレンフイルムを両面接着テープで全面接着し、実施例１のサンプルを作製した。このサンプルを２枚並べて１２００×９００ｍｍのサイズにして、ＪＩＳＡ１４０９に基づき残響室法吸音率を測定した。但し、残響室容積は３６ｍ^３のものを使用した。 Example 1
As a non-breathable sheet material for the sound absorption surface of the lattice structure using a lattice structure composed of triangular lattice (manufactured by Nippon Daiscore Co., Ltd., made of paper, cell diameter 10 mm, 600 × 900 mm, height 20 mm). The same size polypropylene film (1mm thickness, surface density 0.9kg / m ² ) is applied to double-sided adhesive tape (manufactured by Nitoms, super strong double-sided tape for polyethylene / polypropylene, 20mm width, 0.12mm thickness). It adhered to the outer periphery of the body and 6 locations (20 mm square each) on the inner side of the outer periphery at intervals shown in FIG. The size of the non-fixed fixing portion inside the outer peripheral portion of the lattice-like structure is 260 mm square diagonally. About the back surface of the lattice-like structure, a similar polypropylene film was adhered to the entire surface with a double-sided adhesive tape, and a sample of Example 1 was produced. Two of these samples were arranged in a size of 1200 × 900 mm, and the reverberation chamber method sound absorption coefficient was measured based on JIS A 1409. However, a reverberation chamber volume of 36 m ³ was used.

・実施例２
実施例１において、吸音面の固着固定部分を、図１４に示すように、外周部及び内側部に筋状にほぼ等間隔で縦３筋×横１筋とし、その他は実施例１と同様にして実施例２のサンプル（非固着固定部のサイズは約２００×２７０ｍｍ）を作製し、同様にして残響室吸音率を測定した。
・参考例３
実施例１において、外周に外形６００×９００ｍｍで２０ｍｍ高、外周枠幅１５ｍｍのポリプロピレン製枠体を配備してその中に格子状構造体を入れ、吸音面はポリプロピレン製枠体にのみ、裏面は全面両面テープにてそれぞれ接着固定し、その他は実施例１と同様にして参考例３のサンプル（非固着固定部のサイズは約５７０×８７０ｍｍ）を作製し、同様にして残響室吸音率を測定した。 Example 2
In the first embodiment, as shown in FIG. 14, the fixing and fixing portion of the sound absorbing surface is formed by three vertical stripes × one horizontal stripe at substantially equal intervals on the outer peripheral portion and the inner portion, and the others are the same as in the first embodiment. Then, a sample of Example 2 (the size of the non-fixed fixed portion is about 200 × 270 mm) was prepared, and the reverberation chamber sound absorption coefficient was measured in the same manner.
・Reference Example 3
In Example 1, a polypropylene frame having an outer shape of 600 × 900 mm, a height of 20 mm, and a width of the outer frame of 15 mm is arranged on the outer periphery, and a lattice structure is put therein, and the sound absorbing surface is only on the polypropylene frame, Each sample was adhesively fixed with a double-sided tape, and the other samples were prepared in the same manner as in Example 1 except that the sample of Reference Example 3 (the size of the non-fixed fixed part was about 570 × 870 mm) was measured. did.

・実施例４
ハニカム状格子からなる格子状構造体（日本ダイスコア社製、紙製、セル径１５ｍｍ、高さ５０ｍｍ）に、非通気性のシート材として同質の紙（面密度１．０ｋｇ／ｍ^２）をホットメルト接着剤により吸音面に接着固定した。吸音面における接着固定は、図１５に示すように、固着固定部分を３０ｍｍ幅として、格子状構造体の外周及び内部筋状にほぼ等間隔で横筋に２筋接着した（非固着固定部のサイズは約１６０×９４０ｍｍ）。さらに、格子状構造体の吸音面に接着した紙と格子状構造体の裏面には６００×９００ｍｍよりも大きいポリプロピレンフイルム（０．１５ｍｍ）を全面接着し、余った部分同士を折り返して格子状構造体の外周部側面に接着固定して実施例４のサンプルを作製し、同様にして残響室吸音率を測定した。 Example 4
Hot paper of uniform quality (surface density 1.0 kg / m ² ) as a non-breathable sheet material on a lattice structure made of honeycomb lattice (made by Nippon Daiscore Co., Ltd., made of paper, cell diameter 15 mm, height 50 mm) It was bonded and fixed to the sound absorbing surface with a melt adhesive. As shown in FIG. 15, the adhesive fixing on the sound absorbing surface is made by adhering two streaks to the horizontal streaks at substantially equal intervals on the outer periphery and the inner streaks of the lattice-like structure with the fixing fixing portion being 30 mm wide (size of the non-fixing fixing portion). Is approximately 160 × 940 mm). Furthermore, the paper adhered to the sound absorbing surface of the lattice structure and the polypropylene film (0.15 mm) larger than 600 × 900 mm are adhered to the entire back surface of the lattice structure, and the remaining portions are folded back to form the lattice structure. The sample of Example 4 was prepared by bonding and fixing to the outer peripheral side surface of the body, and the reverberation chamber sound absorption coefficient was measured in the same manner.

・比較例１
実施例４で用いたハニカム状格子からなる格子状構造体と同様の構成からなるものであって高さが２０ｍｍの格子状構造体を用い、吸音面に対する紙の接着固定を全面接着とした（非固着固定部なし）以外は実施例４と同様にして比較例１のサンプルを作製し、同様にして残響室吸音率を測定した。
・比較例２
実施例２において、更に間に１筋ずつ接着面を多くした（非固着固定部のサイズは約９０×１２５ｍｍ）。その他は実施例２と同様にして比較例２のサンプルを作成し、同様にして残響室吸音室を測定した。
・比較例３
実施例２において、更に内部にほぼ等間隔で６点ずつ接着面を多くした（非固着固定部のサイズは対角線状に約７５ｍｍ角）。その他は実施例２と同様にして比較例３のサンプルを作成し、同様にして残響室吸音室を測定した。 Comparative example 1
Using a lattice-like structure having the same structure as the lattice-like structure composed of the honeycomb-like lattice used in Example 4 and having a height of 20 mm, the adhesive fixing of the paper to the sound-absorbing surface was set as the entire surface adhesion ( A sample of Comparative Example 1 was prepared in the same manner as in Example 4 except that there was no non-fixed fixed part), and the reverberation chamber sound absorption coefficient was measured in the same manner.
Comparative example 2
In Example 2, the adhesive surface was further increased by one streak in between (the size of the non-fixed fixing portion was about 90 × 125 mm). Other than that, the sample of Comparative Example 2 was prepared in the same manner as in Example 2, and the reverberation chamber sound absorption chamber was measured in the same manner.
Comparative example 3
In Example 2, the adhesive surface was further increased by six points at substantially equal intervals inside (the size of the non-fixed fixing portion was approximately 75 mm square in a diagonal line). Otherwise, the sample of Comparative Example 3 was prepared in the same manner as in Example 2, and the reverberation chamber sound absorption chamber was measured in the same manner.

・参考例５
格子状構造体として、射出成形にて得られた１２５ｍｍ角のポリエチレン製の四角（正方形）状格子、セル径（一辺）３０ｍｍ、高さ３５ｍｍのものを用い、格子状構造体の外周面にウレタン接着剤を塗って吸音面のみにポリプロピレンフイルム（１ｍｍ厚、面密度０．９ｋｇ／ｍ^２）を非通気性のシート材として貼り付けて（非固着固定部のサイズは約１２５ｍｍ角）小サンプルを作製し、この小サンプルの６４個を並べて約１ｍ角状にした参考例５のサンプルを作成し、同様にして残響室吸音率を測定した。 Reference example 5
As a grid structure, a 125 mm square polyethylene square grid obtained by injection molding, a cell diameter (one side) of 30 mm, and a height of 35 mm is used, and urethane is used on the outer peripheral surface of the grid structure. Apply adhesive and affix a polypropylene film (1 mm thickness, surface density 0.9 kg / m ² ) as a non-breathable sheet material only on the sound-absorbing surface (the size of the non-fixed fixed part is approximately 125 mm square). A sample of Reference Example 5 was prepared, in which 64 pieces of this small sample were arranged to form an approximately 1 m square shape, and the reverberation chamber sound absorption coefficient was measured in the same manner.

・参考例６
参考例５において、フイルムの外周をウレタン接着剤に代えてビニルテープにて格子状構造体の外周部側面と接着させた以外は同様にして参考例６のサンプルを作製し、同様にして残響室吸音率を測定した。
・参考例７
参考例６において、格子状構造体の裏面にもポリプロピレンフイルム（１ｍｍ厚、面密度０．９ｋｇ／ｍ２）を配置してこのフイルムの外周をビニルテープにて格子状構造体の外周部側面と接着させた以外は同様にして参考例７のサンプルを作製し、同様にして残響室吸音率を測定した。 Reference example 6
Reference Example 5, except that is bonded to the outer peripheral side surface of the grid-like structure at a vinyl tape instead the outer periphery of the film to the urethane adhesive in the same manner to prepare a sample of Example 6, the reverberation chamber in the same manner The sound absorption rate was measured.
Reference example 7
In Reference Example 6, a polypropylene film (1 mm thickness, surface density 0.9 kg / m 2) is also arranged on the back surface of the lattice structure, and the outer periphery of the film is bonded to the outer peripheral side surface of the lattice structure with vinyl tape. A sample of Reference Example 7 was prepared in the same manner as described above, and the reverberation chamber sound absorption coefficient was measured in the same manner.

・比較例４
参考例５において、接着なしでフイルムを格子状構造体に載せた（全面及び外周部非固定）以外は同様にして比較例４のサンプル（非固着固定部は約１２５ｍｍ角、ただし外周非固定）を作製し、同様にして残響室吸音率を測定した。
・比較例５
参考例５において、両面接着テープ（住友３Ｍ社製、１５ｍｍ幅、１．１ｍｍ厚）を用い、各格子状構造体の４角を隣同士の格子状構造体と共に接着するとともに、各格子状構造体における吸音面の中央部でフイルムを格子状構造体に点接着した（非固着固定部は約１２５ｍｍ角、ただし外周非固定）以外は同様にして比較例５のサンプルを作製し、同様にして残響室吸音率を測定した。
・比較例６
比較例５において、各格子状構造体の吸音面で、点接着に代えて長さ３８ｍｍ、幅１５ｍｍの線状の両面接着テープで４箇所フイルムを格子状構造体に接着固定した（非固着固定部は対角線状に約６７ｍｍ角、ただし外周非固定）以外は同様にして比較例６のサンプルを作製し、同様にして残響室吸音率を測定した。 Comparative example 4
The sample of Comparative Example 4 is the same as in Reference Example 5 except that the film is placed on the lattice structure without adhesion (the entire surface and the outer peripheral portion are not fixed) (the non-fixed fixed portion is about 125 mm square, but the outer periphery is not fixed). The reverberation chamber sound absorption coefficient was measured in the same manner.
Comparative example 5
In Reference Example 5, a double-sided adhesive tape (manufactured by Sumitomo 3M, 15 mm width, 1.1 mm thickness) was used to bond the four corners of each lattice structure together with the adjacent lattice structures, and each lattice structure A sample of Comparative Example 5 was prepared in the same manner except that the film was spot-bonded to the lattice structure at the center of the sound-absorbing surface of the body (the non-fixed fixed part was about 125 mm square, but the outer periphery was not fixed). The reverberation chamber sound absorption was measured.
Comparative Example 6
In Comparative Example 5, on the sound-absorbing surface of each grid-like structure, the four-point film was bonded and fixed to the grid-like structure with a linear double-sided adhesive tape having a length of 38 mm and a width of 15 mm instead of point bonding (non-fixed fixing). The sample of Comparative Example 6 was prepared in the same manner except that the part was diagonally about 67 mm square, but the outer periphery was not fixed, and the reverberation chamber sound absorption coefficient was measured in the same manner.

・参考例８
参考例７において、格子状構造体をサイズ約２５０ｍｍ角で１７ｍｍ高とした（非固着固定部は約２５０ｍｍ角）以外は同様にして参考例８のサンプルを作製し、同様にして残響室吸音率を測定した。
・参考例９
参考例８において、ポリプロピレンフイルムの厚みを１．５ｍｍ（面密度１．３５ｋｇ／ｍ^２）とした以外は同様にして参考例９のサンプルを作製し、同様にして残響室吸音率を測定した。
・参考例１０
参考例９において、フイルムを軟質塩化ビニル樹脂（面密度１．８ｋｇ／ｍ^２）とした以外は、同様にして参考例１０のサンプルを作製し、同様にして残響室吸音率を測定した。 Reference example 8
Reference Example 7, a lattice-like structure was 17mm high at about 250mm square size (non-stick fixing part about 250mm square) except in the same manner to prepare a sample of Reference Example 8, reverberation room sound absorption coefficient in the same manner Was measured.
・Reference Example 9
A sample of Reference Example 9 was prepared in the same manner as in Reference Example 8 except that the thickness of the polypropylene film was 1.5 mm (surface density 1.35 kg / m ² ), and the reverberation chamber sound absorption coefficient was measured in the same manner.
Reference example 10
A sample of Reference Example 10 was prepared in the same manner as in Reference Example 9 except that the film was a soft vinyl chloride resin (surface density 1.8 kg / m ² ), and the reverberation chamber sound absorption coefficient was measured in the same manner.

・参考例１１
参考例８において、ポリプロピレンフイルムの厚みを２．５ｍｍ（面密度２．２５ｋｇ／ｍ^２）とした以外は同様にして参考例１１のサンプル作製し、残響室吸音率を測定した。
・参考例１２
参考例８において、高さ１７ｍｍと高さ２０ｍｍの２種類の格子状構造体を作成し、各８個ずつ１０００×５００ｍｍとなるよう連結して高さが異なる２種類の連結体を形成した。１０００×５００ｍｍのポリプロピレンフイルム（厚み１．０ｍｍ、面密度０．９ｋｇ／ｍ^２）３枚を用い、ポリプロピレンフイルム／１７ｍｍ高格子状構造体の連結体／ポリプロピレンフイルム／２０ｍｍ高格子状構造体の連結体／ポリプロピレンフイルムの順に積層して未接着の積層体とし、この未接着の積層体をコ字状の金具にて挟んで全体の側部を挟持固定し、参考例１２のサンプルを作成した（非固着固定部は１０００ｍｍ弱×５００ｍｍ弱）。同サンプル２個を並べ、１７ｍｍ高の格子状構造体側を上にして同様にして残響室吸音率を測定した。 Reference example 11
A sample of Reference Example 11 was prepared in the same manner as in Reference Example 8 except that the thickness of the polypropylene film was 2.5 mm (surface density 2.25 kg / m ² ), and the reverberation chamber sound absorption coefficient was measured.
Reference example 12
In Reference Example 8, two types of grid-like structures having a height of 17 mm and a height of 20 mm were prepared and connected to form 8 × 1000 mm pieces each having two different heights. Three 1000 × 500 mm polypropylene films (thickness 1.0 mm, surface density 0.9 kg / m ² ) are used, and polypropylene film / 17 mm high lattice structure connected body / polypropylene film / 20 mm high lattice structure connected. The body / polypropylene film was laminated in this order to form an unadhered laminate, and the unadhered laminate was sandwiched between U-shaped metal fittings, and the entire side portions were sandwiched and fixed to prepare a sample of Reference Example 12 ( (The non-fixed fixed part is a little less than 1000 mm × a little less than 500 mm). Two of the samples were arranged, and the sound absorption rate of the reverberation chamber was measured in the same manner with the 17 mm-high lattice structure side facing up.

・比較例７
参考例８において、更に、両面テープにより格子の交差点９点でフイルムを点接着した（非固着固定部は対角線状に約６０ｍｍ角）以外は、同様にして比較例７のサンプルを作製し、同様にして残響室吸音率を測定した。
なお、前記実施例１、２、４、参考例３、参考例５〜１２及び比較例１〜７の構成を表１に簡単に示す。また、残響室吸音率の測定結果を図１６〜図１８に示す。 Comparative example 7
The sample of Comparative Example 7 was prepared in the same manner as in Reference Example 8, except that the film was further point-attached at 9 points of lattice intersection with a double-sided tape (the non-fixed fixed part was about 60 mm square diagonally). Then, the reverberation chamber sound absorption coefficient was measured.
The configurations of Examples 1 , 2, and 4, Reference Example 3, Reference Examples 5 to 12, and Comparative Examples 1 to 7 are simply shown in Table 1. Moreover, the measurement result of the reverberation room sound absorption coefficient is shown in FIGS.

実施例１、実施例２、実施例４、参考例３及び比較例１〜比較例３の残響室吸音率測定結果を示す図１６から理解されるように、実施例１、２、４、参考例３は５００Ｈｚ以下の低周波数領域において高い吸音率を示すのに対し、比較例１〜３は、５００Ｈｚ以下の低周波数領域では吸音率が低く、５００Ｈｚよりも高い高周波数領域で吸音率が高くなっている。特に比較例３では高周波数へのシフトが激しく、かつ吸音率も極めて低い。 As can be understood from FIG. 16 showing the reverberation chamber sound absorption measurement results of Example 1 , Example 2, Example 4 , Reference Example 3, and Comparative Examples 1 to 3, Examples 1 , 2, 4, Reference While Example 3 shows a high sound absorption rate in a low frequency region of 500 Hz or less, Comparative Examples 1 to 3 have a low sound absorption rate in a low frequency region of 500 Hz or less and a high sound absorption rate in a high frequency region higher than 500 Hz. It has become. In particular, in Comparative Example 3, the shift to a high frequency is severe and the sound absorption rate is extremely low.

参考例５〜参考例７及び比較例４〜比較例６の残響室吸音率測定結果を示す図１７から理解されるように、参考例５〜７は５００Ｈｚ以下の低周波数領域において高い吸音率を示すのに対し、比較例４〜６は、５００Ｈｚより低い低周波数領域では吸音率が低く、５００Ｈｚよりも高い高周波数領域で吸音率が高くなっている。 As can be understood from FIG. 17 showing the reverberation chamber sound absorption rate measurement results of Reference Example 5 to Reference Example 7 and Comparative Example 4 to Comparative Example 6, Reference Examples 5 to 7 have a high sound absorption rate in a low frequency region of 500 Hz or less. On the other hand, in Comparative Examples 4 to 6, the sound absorption coefficient is low in a low frequency region lower than 500 Hz, and the sound absorption coefficient is high in a high frequency region higher than 500 Hz.

参考例８〜参考例１２及び比較例７の残響室吸音率測定結果を示す図１８から理解されるように、参考例８〜１２は５００Ｈｚ以下の低周波数領域において高い吸音率を示している。また、格子状構造体の高さ（厚み）が異なる２種類を積層した参考例１２は、５００Ｈｚ未満の低周波数領域と５００Ｈｚ〜１０００Ｈｚ間の両方の周波数領域で吸音率が高くなっている。一方、比較例７は５００Ｈｚ以下の低周波数領域では吸音率が低く、５００Ｈｚより高い高周波数領域で吸音率が高くなっている。 As can be understood from FIG. 18 showing the reverberation chamber sound absorption rate measurement results of Reference Examples 8 to 12 and Comparative Example 7, Reference Examples 8 to 12 show a high sound absorption rate in a low frequency region of 500 Hz or less. Moreover, the reference example 12 which laminated | stacked two types from which the height (thickness) of a grid | lattice-like structure laminated | stacked has a high sound absorption coefficient in both the low frequency area | region below 500 Hz and the frequency area between 500 Hz-1000 Hz. On the other hand, in Comparative Example 7, the sound absorption rate is low in a low frequency region of 500 Hz or less, and the sound absorption rate is high in a high frequency region higher than 500 Hz.

このように、本発明の吸音パネルは、５００Ｈｚ前後以下の低周波数領域で高い吸音率を発揮することができ、しかも厚みが薄いものであり、例えば、建設機械のファンなどの騒音対策、工場における集塵機、空調機など各種モーター機械騒音対策、電気機器類の騒音対策、鉄道・新幹線などのデッキ、パンタグラフでの騒音対策、建物の壁・天井・床の防音材、オフィス・トイレなどの仕切り壁、道路・空港などの防音壁などとして好適なものである。 As described above, the sound absorbing panel of the present invention can exhibit a high sound absorption coefficient in a low frequency region of about 500 Hz or less, and has a small thickness. For example, noise countermeasures such as construction machine fans, Noise countermeasures for various motor machines such as dust collectors, air conditioners, noise countermeasures for electrical equipment, decks for railways and bullet trains, noise countermeasures for pantographs, soundproofing materials for building walls, ceilings and floors, partition walls for offices and toilets, It is suitable as a soundproof wall for roads and airports.

１０Ａ，１０Ｂ吸音パネル
１１Ａ，１１Ｂ格子状構造体
２１Ａ，２１Ｂ非通気性のシート材
１７Ａ，１７Ｂ格子状構造体の外周部
１８Ａ，１８Ｂ外周部より内側の固定部 10A, 10B Sound absorbing panel 11A, 11B Lattice-like structure 21A, 21B Non-breathable sheet material 17A, 17B Outer peripheral part of the lattice-like structure 18A, 18B Fixed part inside the outer peripheral part

Claims

In the sound-absorbing panel in which a non-breathable sheet material is disposed on at least one side of a plate-like lattice-like structure having both sides opened,
The lattice-like structure has a plurality of cells partitioned by partition walls inside the outer peripheral portion,
The non-breathable sheet material is fixed to the outer peripheral portion of the lattice-like structure and a plurality of partitions on the inner side of the outer peripheral portion, and the inner portion of the outer periphery of the lattice-like structure is A sound-absorbing panel, wherein a portion including a square of at least 10 cm on a side of a breathable sheet material is not fixed to a partition wall of the lattice-like structure located in the portion.

The sound absorbing panel according to claim 1, wherein the lattice-like structure has a planar shape of cells that is polygonal or circular, and a height of each cell is 10 to 100 mm.

The non-breathable sheet material, sound-absorbing panel according to claim 1 or 2, characterized in that the surface density of 0.05~2.0kg / ^{m 2.}