JP6781766B2 - 防音構造体、および防音構造体の製造方法 - Google Patents
防音構造体、および防音構造体の製造方法 Download PDFInfo
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- JP6781766B2 JP6781766B2 JP2018546359A JP2018546359A JP6781766B2 JP 6781766 B2 JP6781766 B2 JP 6781766B2 JP 2018546359 A JP2018546359 A JP 2018546359A JP 2018546359 A JP2018546359 A JP 2018546359A JP 6781766 B2 JP6781766 B2 JP 6781766B2
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Description
入射する音波を減衰させる多孔質な繊維体を有し、
前記繊維体は、平均繊維径が0.5μm以上5μm以下である繊維で形成され、音波が入射する表面層と、前記表面層と積層され前記表面層から音波が伝搬する伝搬層とを含み、
前記伝搬層は、前記表面層の密度よりも大きい密度を有する高密度層を含み、
前記繊維体は、前記表面層を積層方向の両面に有し、前記両面の前記表面層の間に前記高密度層を有し、
前記繊維体の各表面から前記伝搬層にかけて、前記繊維体の密度が段階的または連続的に大きくなる。
図1は、一実施形態による防音構造体を示す断面図である。図1において、矢印の方向は、繊維体10に対する音波の入射方向を表す。尚、図1では、音波は繊維体10の表面11に対し垂直に入射しているが、斜めに入射してもよい。
上記実施形態の繊維体は二層構造を有するのに対し、本変形例の繊維体は三層構造を有する。以下、相違点について主に説明する。尚、繊維体は、二層構造や三層構造に限定されず、四層以上の多層構造でもよい。
上記第1変形例の繊維体は積層方向の片面から音波が入射するのに対し、本変形例の繊維体は積層方向の両面から音波が入射する。以下、相違点について主に説明する。尚、繊維体に対し両側から音波が入射する場合、繊維体は、三層構造に限定されず、四層以上の多層構造でもよい。
図5は、図1の繊維体および図4の繊維体の設置例を示す断面図である。図5において、矢印の方向は音波の進む方向を表し、矢印の太さは音波のエネルギーの大きさを表す。また、図5において、SSは音波を発生させる音源を表す。
例1〜例7の繊維体は、それぞれ、ロッテケミカル製のポリプロピレン樹脂FR-185をメルトブローン法で繊維化した綿状の繊維層を採取し、複数の繊維層を重ねてニードルパンチ法で結合し、直径が100mm、積層方向の合計の厚さが50mmの円柱状に形成した。
繊維体の平均繊維径は、株式会社日立製作所製の電子顕微鏡「S−3500N」を用いて測定した。例1〜例6では、倍率1500倍で電子顕微鏡写真を撮影し、100本の繊維径を測定し、その100個の測定データの平均値を平均繊維径とした。また、例7では、倍率500倍で電子顕微鏡写真を撮影し、100本の繊維径を測定し、その100個の測定データの平均値を平均繊維径とした。
垂直入射吸音率は、日本音響(株)製の音響管を使用し、JIS A 1405−2に準拠して測定した。具体的には、作製した円柱状の繊維体の片側の平面に対し垂直に音波を入射させ、周波数100Hz〜2000Hzの範囲の垂直入射吸音率を測定した。
表1に、例1〜例7の繊維体のかさ密度や平均繊維径、繊維体を構成する三個の繊維層(表面層、中間層、および背面層)の密度や厚さを示す。繊維体の吸音特性は、図9に示す。
11 表面
12 背面
20 表面層
30 背面層(伝搬層)
10A 繊維体
11A 表面
12A 背面
20A 表面層
30A 中間層(伝搬層)
40A 背面層(伝搬層)
10B 繊維体
11B 第1の表面
12B 第2の表面
20B 第1の表面層
30B 中間層(伝搬層)
40B 第2の表面層
10C 繊維体
20C 表面層
30C コア層(伝搬層)
Claims (4)
- 入射する音波を減衰させる多孔質な繊維体を有し、
前記繊維体は、平均繊維径が0.5μm以上5μm以下である繊維で形成され、音波が入射する表面層と、前記表面層と積層され前記表面層から音波が伝搬する伝搬層とを含み、
前記伝搬層は、前記表面層の密度よりも大きい密度を有する高密度層を含み、
前記繊維体は、前記表面層を積層方向の両面に有し、前記両面の前記表面層の間に前記高密度層を有し、
前記繊維体の各表面から前記伝搬層にかけて、前記繊維体の密度が段階的または連続的に大きくなる、防音構造体。 - 入射する音波を減衰させる多孔質な繊維体を有し、
前記繊維体は、平均繊維径が0.5μm以上5μm以下である繊維で形成され、音波が入射する表面層と、前記表面層と積層され前記表面層から音波が伝搬する伝搬層とを含み、
前記伝搬層は、前記表面層の密度よりも大きい密度を有する高密度層を含み、
前記繊維体のかさ密度が40kg/m 3 以上50kg/m 3 以下である、防音構造体。 - 入射する音波を減衰させる多孔質な繊維体を有し、
前記繊維体は、平均繊維径が0.5μm以上5μm以下である繊維で形成され、音波が入射する表面層と、前記表面層と積層され前記表面層から音波が伝搬する伝搬層とを含み、
前記伝搬層は、前記表面層の密度よりも大きい密度を有する高密度層を含み、
前記繊維体の厚さが40mm以上100mm以下であって、
350Hz以上2000Hz以下の範囲内の任意の周波数の音波に対する、前記繊維体の垂直入射吸音率が55%以上である、防音構造体。 - 請求項1〜3のいずれか1項に記載の防音構造体を製造する、防音構造体の製造方法であって、
平均繊維径が0.5μm以上5μm以下である前記繊維を用いて、音波が入射する前記表面層を形成する工程と、前記表面層の密度よりも大きい密度を有する前記高密度層を形成する工程とを含む、防音構造体の製造方法。
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