JPH1162047A - Sound absorbing sheet - Google Patents
Sound absorbing sheetInfo
- Publication number
- JPH1162047A JPH1162047A JP9223823A JP22382397A JPH1162047A JP H1162047 A JPH1162047 A JP H1162047A JP 9223823 A JP9223823 A JP 9223823A JP 22382397 A JP22382397 A JP 22382397A JP H1162047 A JPH1162047 A JP H1162047A
- Authority
- JP
- Japan
- Prior art keywords
- sound
- sound absorbing
- absorbing sheet
- absorbing
- sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、遮音板の表面に取
付け手段を介して取付けられるか、一体的に設けられて
使用されるか、またはそれ自体独立して使用される吸音
シートに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound-absorbing sheet which is mounted on a surface of a sound insulating plate via mounting means, is provided integrally, or is used independently.
【０００２】[0002]
【従来の技術】吸音シートの一形式として、シート状の
発泡体と、該発泡体の表面に貼着されて該表面を被覆す
る薄膜状の表皮からなる吸音シートが知られている。こ
の吸音シートは、例えば特開平８−４０１５４号公報に
示されているように、遮音板の表面に一体的に設けられ
て、遮音板による騒音の遮音作用とともに騒音を吸収し
て、騒音の外部または内部への漏洩を防止すべく機能す
るものである。2. Description of the Related Art As one type of sound-absorbing sheet, there is known a sound-absorbing sheet composed of a sheet-like foam and a thin skin covering the surface of the foam and covering the surface. This sound absorbing sheet is provided integrally with the surface of the sound insulating plate, as shown in, for example, Japanese Patent Application Laid-Open No. H8-40154, absorbs noise together with the sound insulating effect of the sound insulating plate, and provides the external noise. Alternatively, it functions to prevent leakage to the inside.
【０００３】この吸音シートの表皮は、発泡体の表面に
対する汚染、化学的または物理的損傷等を防止するため
に設けられている。しかし、発泡体の表面を被覆してい
ることから騒音の発泡体内への進入を妨げ、発泡体の吸
音特性を損なうことになる。[0003] The skin of this sound absorbing sheet is provided to prevent contamination, chemical or physical damage to the surface of the foam. However, since the foam covers the surface of the foam, it prevents noise from entering the foam and impairs the sound absorbing properties of the foam.
【０００４】[0004]
【発明が解決しようとする課題】このため、上記した公
報に示されている吸音シートは、表皮の表面に凹凸状の
微細なしぼを無数に形成して吸音特性を向上させる手段
が採られている。しかしながら、微細なしぼを形成する
程度では吸音特性の大幅な向上は期待できない。本発明
は広い周波数領域において吸音特性の高い吸音シートを
提供することを目的とする。For this reason, the sound-absorbing sheet disclosed in the above-mentioned publication is provided with means for improving the sound-absorbing characteristics by forming an infinite number of fine bumps on the surface of the skin. I have. However, it is not possible to expect a significant improvement in sound absorption characteristics just to form a fine grain. An object of the present invention is to provide a sound absorbing sheet having high sound absorbing characteristics in a wide frequency range.
【０００５】[0005]
【課題を解決するための手段】本発明者は、吸音シート
の表面部の形状、構造について広く検討を重ね、吸音シ
ートの表面側に膜振動吸音構造部と波形表面吸音構造部
を形成することにより、吸音シートの吸音特性を向上さ
せることができることを確認し、本発明を完成したもの
である。The inventor of the present invention has made extensive studies on the shape and structure of the surface portion of the sound absorbing sheet, and formed a film vibration absorbing structure and a wavy surface sound absorbing structure on the front side of the sound absorbing sheet. Thus, it was confirmed that the sound-absorbing properties of the sound-absorbing sheet could be improved, and the present invention was completed.
【０００６】すなわち、本発明の吸音シートは、シート
状の発泡体と、該発泡体の表面に貼着されて該表面を被
覆する薄膜状の表皮からなる吸音シートであり、当該吸
音シートはその表面側に膜振動吸音構造部と波形表面吸
音構造部を備えていることを特徴とするものである。本
発明の吸音シートは、これら膜振動吸音構造部と波形表
面吸音構造部とが偏ることなく均一に混在しているのが
好ましい。また、膜振動吸音構造部を、発泡体に形成さ
れて発泡体の表面に開口する複数の孔と、表皮がこれら
の孔の開口端を覆蓋する薄膜部にて構成することがで
き、波形表面吸音構造部を、発泡体の表面側に複数条の
畝状に形成された凹凸部と、表皮がこれらの凹凸部の表
面に沿って貼着されて被覆する薄膜部にて構成すること
が好ましい。That is, the sound-absorbing sheet of the present invention is a sound-absorbing sheet composed of a sheet-like foam and a thin skin covering the surface of the foam and covering the surface. On the front side, a membrane vibration sound absorbing structure and a corrugated surface sound absorbing structure are provided. In the sound absorbing sheet of the present invention, it is preferable that the film vibration sound absorbing structure and the corrugated surface sound absorbing structure are uniformly mixed without being biased. Further, the membrane vibration-absorbing structure can be composed of a plurality of holes formed in the foam and opening to the surface of the foam, and a thin film portion in which the skin covers the opening ends of these holes. It is preferable that the sound-absorbing structure is constituted by a plurality of ridges and valleys formed on the surface side of the foam, and a thin film portion in which the skin is adhered and covered along the surface of these ridges and valleys. .
【０００７】また、波形表面吸音構造部の複数形成され
た凹凸部の形状については、三角錐状の断面構造に形成
すること、波形表面吸音構造部を構成する凸部の頂部を
鋭角の形状に構成することが好ましい。[0007] The shape of a plurality of uneven portions of the corrugated surface sound absorbing structure is formed in a triangular pyramid cross-sectional structure, and the top of the convex portion constituting the corrugated surface sound absorbing structure is formed into an acute angle. It is preferable to configure.
【０００８】[0008]
【発明の作用・効果】シート状の発泡体とこの発泡体の
表面に貼着されてその表面を被覆する薄膜状の表皮から
なる吸音シートは、膜振動吸音構造部および波形表面吸
音構造部をそれぞれ単独で形成した場合には、それぞれ
特定の周波数領域での吸音特性を向上させることができ
るが、膜振動吸音構造部および波形表面吸音構造部を共
に形成して共存させると、これら両吸音構造部の吸音作
用が相乗して、広い周波数領域で吸音特性が向上する。The sound-absorbing sheet composed of a sheet-like foam and a thin skin covering the surface of the foam and covering the surface thereof has a membrane vibration-absorbing structure and a wavy surface sound-absorbing structure. When each is formed independently, the sound absorption characteristics in a specific frequency region can be respectively improved.However, when both the film vibration absorption structure and the corrugated surface sound absorption structure are formed and coexist, both of these sound absorption structures can be improved. The sound absorbing effect of the parts is synergistic, and the sound absorbing characteristics are improved in a wide frequency range.
【０００９】本発明の吸音シートは、膜振動吸音構造部
および波形表面吸音構造部の両吸音浩三部を持ち、共存
させている。そのため本発明の吸音シートは、広い周波
数領域での高い吸音特性を持つ。よって、本発明の吸音
シートは、遮音板の表面に取付け手段を介して取付ける
か、一体的に設けて使用し、または、それ自体独立して
使用することにより、高い吸音機能を発揮させることが
できる。The sound-absorbing sheet of the present invention has both a film vibration-absorbing structure and a corrugated surface sound-absorbing structure and coexists. Therefore, the sound absorbing sheet of the present invention has high sound absorbing characteristics in a wide frequency range. Therefore, the sound-absorbing sheet of the present invention can exhibit a high sound-absorbing function by being attached to the surface of the sound-insulating plate via the attaching means, provided integrally, or used independently. it can.
【００１０】[0010]
【発明の実施の形態】以下、本発明を図面に基づいて説
明すると、図１〜図３には、本発明の吸音シートの一例
が示されている。この本発明の吸音シートは、ポリウレ
タンフォームからなるシート状の発泡体１１と、ポリウ
レタンフィルムからなる表皮１２とにより構成されてい
る。この吸音シートの表面側に複数の膜振動吸音構造部
１０ａと波形表面吸音構造部１０ｂを備えている。これ
ら両吸音構造部１０ａ，１０ｂは、吸音シートの表面に
互いに千鳥配列されて、偏ることなく均等に位置してい
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIGS. 1 to 3 show an example of a sound absorbing sheet of the present invention. The sound absorbing sheet of the present invention includes a sheet-like foam 11 made of polyurethane foam and a skin 12 made of polyurethane film. A plurality of membrane vibration sound absorbing structures 10a and a corrugated surface sound absorbing structure 10b are provided on the front side of the sound absorbing sheet. These two sound absorbing structures 10a and 10b are arranged in a zigzag pattern on the surface of the sound absorbing sheet and are evenly located without bias.
【００１１】膜振動吸音構造部１０ａは長方形状の平面
領域を有しており、同平面領域にてシート状の発泡体１
１に形成された多数の貫通孔１３と、各貫通孔１３の表
面開口部を覆蓋する表皮１２の一部である薄膜部１４に
て構成されている。各貫通孔１３は所定の孔径を有して
いて、所定間隔を保持して縦横に整列配列されている。The membrane vibration sound absorbing structure 10a has a rectangular planar area, and the sheet-like foam 1 is formed in the planar area.
A plurality of through-holes 13 formed in the first through-hole 1 and a thin film portion 14 that is a part of the skin 12 that covers the surface opening of each through-hole 13. Each through-hole 13 has a predetermined hole diameter, and is arranged vertically and horizontally at a predetermined interval.
【００１２】波形表面構造部１０ｂも、長方形状の平面
領域を有しており、同平面領域にてシート状の発泡体１
１に形成された凹凸部１５と、凹凸部１５を被覆する表
皮１２の一部である薄膜部１５にて構成されている。凹
凸部１５は、三角錐状の断面構造を呈する多数の山部と
谷部を畝状に形成してなるもので、各山部の頂部は所定
の角度を有している。The corrugated surface structure 10b also has a rectangular planar area, and the sheet-like foam 1 is formed in the planar area.
1 and a thin film portion 15 that is a part of the skin 12 that covers the uneven portion 15. The uneven portion 15 is formed by forming a large number of peaks and valleys having a triangular pyramid cross-sectional structure in a ridge shape, and the top of each peak has a predetermined angle.
【００１３】この本発明の吸音シートは、縦５０４ｍ
ｍ、横６０５ｍｍの大きさで、膜振動吸音構造部１０ａ
の厚み２０ｍｍ、各貫通孔１３の孔径２５ｍｍ、各貫通
孔１３の中心間の間隔４５ｍｍであり、また、波形表面
吸音構造部１０ｂの厚み３０ｍｍ、底部平坦部の厚み５
ｍｍ、山部の高さ２５ｍｍ、山部の間隔２０ｍｍ、山部
の頂部角度３０度である。なお、表皮１２の厚みは３０
μｍである。The sound absorbing sheet of the present invention has a length of 504 m.
m, having a size of 605 mm in width, and a membrane vibration absorbing structure 10 a
20 mm, the hole diameter of each through hole 13 is 25 mm, the distance between the centers of the through holes 13 is 45 mm, the thickness of the corrugated surface sound absorbing structure 10 b is 30 mm, and the thickness of the bottom flat portion is 5 mm.
mm, the height of the peaks is 25 mm, the interval between the peaks is 20 mm, and the top angle of the peaks is 30 degrees. The thickness of the skin 12 is 30
μm.
【００１４】図４〜図６には、この本発明の吸音シート
の吸音特性と、比較例として挙げる膜振動吸音構造部の
みからなる吸音シートの吸音特性、および他の比較例と
して挙げる波形表面吸音構造部のみからなる吸音シート
の吸音特性とを比較したグラフを示している。図４に示
す吸音特性において、×印のグラフは膜振動吸音構造部
および波形表面吸音構造部を偏りなく有する本発明の吸
音シートの吸音特性（貫通孔の孔径２５ｍｍ）、●印の
グラフ（貫通孔の孔径８ｍｍ）、無印のグラフ（貫通孔
の孔径２５ｍｍ）、○印のグラフ（貫通孔の孔径３４ｍ
ｍ）は、膜振動吸音構造部のみを有する比較例の吸音シ
ートの吸音特性である。FIGS. 4 to 6 show the sound absorbing characteristics of the sound absorbing sheet of the present invention, the sound absorbing characteristics of the sound absorbing sheet comprising only the membrane vibration absorbing structure as a comparative example, and the corrugated surface sound absorbing as another comparative example. 4 shows a graph comparing sound absorbing characteristics of a sound absorbing sheet including only a structural part. In the sound absorption characteristics shown in FIG. 4, a graph with a cross indicates a sound absorption characteristic of the sound absorbing sheet of the present invention (a hole diameter of a through hole is 25 mm) having a film vibration absorption structure and a wavy surface sound absorption structure without bias, and a graph with a black circle (through Hole diameter 8 mm), unmarked graph (through-hole diameter 25 mm), o-marked graph (through-hole diameter 34 m)
m) is a sound absorbing characteristic of the sound absorbing sheet of the comparative example having only the membrane vibration sound absorbing structure.
【００１５】これらの結果を参照すると、膜振動吸音構
造部のみを有する比較例の吸音シートにおいては、各孔
径に応じて、それぞれ特定の周波数領域において吸音特
性の向上が認められる。これに対して、本発明の吸音シ
ートは、膜振動吸音構造部のみを有する比較例の吸音シ
ートに比較して、より広い周波数領域において吸音特性
の向上が認められる。Referring to these results, in the sound-absorbing sheet of the comparative example having only the membrane vibration-absorbing structure, the improvement of the sound-absorbing characteristics in a specific frequency range is recognized according to each hole diameter. On the other hand, the sound absorbing sheet of the present invention has improved sound absorbing characteristics in a wider frequency range than the sound absorbing sheet of the comparative example having only the membrane vibration absorbing structure.
【００１６】図５に示す吸音特性において、×印のグラ
フは膜振動吸音構造部および波形表面吸音構造部を偏り
なく有する本発明の吸音シートの吸音特性（各貫通孔の
中心間の間隔４５ｍｍ）、無印のグラフ（各貫通孔の中
心間の間隔４５ｍｍ）、○印のグラフ（各貫通孔の中心
間の間隔９０ｍｍ）は、膜振動吸音構造部のみを有する
比較例の吸音シートの吸音特性である。In the sound absorbing characteristics shown in FIG. 5, the graph marked with a cross indicates the sound absorbing characteristics of the sound absorbing sheet of the present invention having the membrane vibration sound absorbing structure and the corrugated surface sound absorbing structure without deviation (the distance between the centers of the through holes is 45 mm). , An unmarked graph (interval between the centers of the through holes 45 mm), and a graph (interval 90 mm between the centers of the through holes) indicate the sound absorbing characteristics of the sound absorbing sheet of the comparative example having only the membrane vibration absorbing structure. is there.
【００１７】これらの結果を参照すると、膜振動吸音構
造部のみを有する比較例の吸音シートは、各貫通孔の中
心間の間隔に応じて、それぞれ特定の周波数領域におい
て吸音特性の向上が認められる。これに対して、本発明
の吸音シートは、膜振動吸音構造部のみを有する比較例
の吸音シートに比較して、より広い周波数領域において
吸音特性の向上が認められる。Referring to these results, the sound absorbing sheet of the comparative example having only the membrane vibration absorbing structure has an improved sound absorbing characteristic in a specific frequency range according to the distance between the centers of the through holes. . On the other hand, the sound absorbing sheet of the present invention has improved sound absorbing characteristics in a wider frequency range than the sound absorbing sheet of the comparative example having only the membrane vibration absorbing structure.
【００１８】図６に示す吸音特性において、×印のグラ
フは膜振動吸音構造部および波形表面吸音構造部を偏り
なく有する本発明の吸音シートの吸音特性（山部の間隔
２０ｍｍで頂部鋭角）、無印のグラフ（山部の間隔２０
ｍｍで頂部鋭角）、○印のグラフ（山部の間隔２０ｍｍ
で頂部円弧状）、●印のグラフ（山部の間隔４６ｍｍで
頂部円弧状）は、波形表面吸音構造部のみを有する他の
比較例の吸音シートの吸音特性である。In the sound absorbing characteristics shown in FIG. 6, the graphs indicated by x indicate the sound absorbing characteristics of the sound absorbing sheet of the present invention having the membrane vibration sound absorbing structure and the corrugated surface sound absorbing structure without bias (the peak angle is 20 mm and the peak angle is 20 mm). Unmarked graph (interval 20
mm, acute angle at the top), graph marked with ○ (interval between peaks 20 mm)
The graphs indicated by the black circles (top arc shape with a gap of 46 mm between the peaks) are the sound absorbing characteristics of the sound absorbing sheet of another comparative example having only the corrugated surface sound absorbing structure.
【００１９】これらの結果を参照すると、波形表面吸音
構造部のみを有する他の比較例の吸音シートは、各貫通
孔の中心間の間隔に応じて、それぞれ特定の周波数領域
において吸音特性の向上が認められる。これに対して、
本発明の吸音シートは、波形表面吸音構造部のみを有す
る他の比較例の吸音シートに比較して、より広い周波数
領域において吸音特性の向上が認められる。Referring to these results, the sound-absorbing sheet of another comparative example having only the corrugated surface sound-absorbing structure has an improved sound absorbing characteristic in a specific frequency region according to the distance between the centers of the through holes. Is recognized. On the contrary,
The sound-absorbing sheet of the present invention has improved sound-absorbing properties in a wider frequency range than the sound-absorbing sheet of another comparative example having only the corrugated surface sound-absorbing structure.
【００２０】本発明の吸音シートは、その表面部に膜振
動吸音構造部および波形表面吸音構造部を持つ複雑な形
状、構造を持つ。しかし本発明の吸音シートは、所定形
状に形成されたシート状の発泡体と、この発泡体の表面
に貼着された表皮の２部品で構成されている。このよう
に部品点数が少ないため製造が容易であるという利点も
ある。The sound absorbing sheet of the present invention has a complicated shape and structure having a membrane vibration sound absorbing structure and a wavy surface sound absorbing structure on the surface thereof. However, the sound-absorbing sheet of the present invention is composed of a sheet-like foam formed into a predetermined shape and a skin attached to the surface of the foam. There is also an advantage that the production is easy because the number of parts is small.
【図１】本発明の吸音シートの一例を示す平面図であ
る。FIG. 1 is a plan view showing an example of a sound absorbing sheet of the present invention.
【図２】本発明の吸音シートにおける図１の矢印２−２
線方向の縦断面図である。FIG. 2 shows an arrow 2-2 of FIG. 1 in the sound absorbing sheet of the present invention.
It is a longitudinal cross-sectional view in the line direction.
【図３】本発明の吸音シートにおける図１の矢印３−３
線方向の縦断面図である。FIG. 3 is an arrow 3-3 of FIG. 1 in the sound absorbing sheet of the present invention.
It is a longitudinal cross-sectional view in the line direction.
【図４】本発明の吸音シートと膜振動吸音構造部のみを
有する比較例の吸音シート（貫通孔の孔径が相違する）
の吸音特性を示すグラフである。FIG. 4 is a sound absorbing sheet of a comparative example having only the sound absorbing sheet of the present invention and a membrane vibration sound absorbing structure (hole diameters of through holes are different).
5 is a graph showing the sound absorption characteristics of the horn.
【図５】本発明の吸音シートと膜振動吸音構造部のみを
有する比較例の吸音シート（各貫通孔の中心間の間隔が
相違する）の吸音特性を示すグラフである。FIG. 5 is a graph showing sound absorbing characteristics of a sound absorbing sheet of the present invention and a sound absorbing sheet of a comparative example having only a membrane vibration absorbing structure (different intervals between centers of through holes).
【図６】本発明の吸音シートと波形表面吸音構造部のみ
を有する他の比較例の吸音シート（山部の間隔、頂部角
度が相違する）の吸音特性を示すグラフである。FIG. 6 is a graph showing sound absorbing characteristics of a sound absorbing sheet of the present invention and a sound absorbing sheet of another comparative example having only a corrugated surface sound absorbing structure (different in the interval between peaks and the angle of the top).
１０ａ…膜振動吸音構造部、１０ｂ…波形表面吸音構造
部、１１…シート状の発泡体、１２…表皮、１３…貫通
孔、１４…表皮膜部、１５…凹凸部。10a: membrane vibration sound absorbing structure, 10b: corrugated surface sound absorbing structure, 11: sheet-like foam, 12: skin, 13: through hole, 14: surface coating, 15: uneven portion.
Claims (6)
着されて該表面を被覆する薄膜状の表皮からなる吸音シ
ートであり、当該吸音シートはその表面側に膜振動吸音
構造部と波形表面吸音構造部とを備えていることを特徴
とする吸音シート。1. A sound-absorbing sheet comprising a sheet-like foam and a thin skin covering the surface of the foam and covering the surface, wherein the sound-absorbing sheet has a membrane vibration absorbing structure on its surface side. A sound-absorbing sheet comprising a portion and a corrugated surface sound-absorbing structure.
成されて該発泡体の表面に開口する複数の孔と、前記表
皮が該孔の開口端を覆蓋する薄膜部とで構成されている
請求項１に記載の吸音シート。2. The membrane vibration-absorbing structure comprises a plurality of holes formed in the foam and open to the surface of the foam, and a thin film portion in which the skin covers an open end of the hole. The sound absorbing sheet according to claim 1, wherein
表面側に複数条の畝状に形成された凹凸部と、前記表皮
が該凹凸部の表面に沿って貼着されて被覆する薄膜部と
で構成されている請求項１に記載の吸音シート。3. The corrugated surface sound-absorbing structure portion includes a plurality of ridges formed on the surface side of the foam body, and the skin is adhered along the surface of the rugged portion. The sound absorbing sheet according to claim 1, comprising a thin film portion.
は、三角錐状の断面構造を呈している請求項３に記載の
吸音シート。4. The sound-absorbing sheet according to claim 3, wherein the irregularities constituting the corrugated surface sound-absorbing structure have a triangular pyramid cross-sectional structure.
頂部は鋭角を呈している請求項４に記載の吸音シート。5. The sound-absorbing sheet according to claim 4, wherein the tops of the projections forming the corrugated surface sound-absorbing structure have an acute angle.
れて使用される請求項１，２，３，４また５に記載の吸
音シート。6. The sound-absorbing sheet according to claim 1, wherein said sound-absorbing sheet is used by being attached to a surface of a sound insulating plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9223823A JPH1162047A (en) | 1997-08-20 | 1997-08-20 | Sound absorbing sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9223823A JPH1162047A (en) | 1997-08-20 | 1997-08-20 | Sound absorbing sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1162047A true JPH1162047A (en) | 1999-03-05 |
Family
ID=16804289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9223823A Pending JPH1162047A (en) | 1997-08-20 | 1997-08-20 | Sound absorbing sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1162047A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009149117A (en) * | 2007-12-18 | 2009-07-09 | Yamaha Corp | Sound absorbing structure for automobile ceiling, and its manufacturing method |
| US8371419B2 (en) | 2008-04-22 | 2013-02-12 | 3M Innovative Properties Company | Hybrid sound absorbing sheet |
| US8469145B2 (en) | 2008-04-14 | 2013-06-25 | 3M Innovative Properties Company | Multilayer sound absorbing sheet |
| US8573358B2 (en) | 2008-05-22 | 2013-11-05 | 3M Innovative Properties Company | Multilayer sound absorbing structure comprising mesh layer |
-
1997
- 1997-08-20 JP JP9223823A patent/JPH1162047A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009149117A (en) * | 2007-12-18 | 2009-07-09 | Yamaha Corp | Sound absorbing structure for automobile ceiling, and its manufacturing method |
| US8469145B2 (en) | 2008-04-14 | 2013-06-25 | 3M Innovative Properties Company | Multilayer sound absorbing sheet |
| US8371419B2 (en) | 2008-04-22 | 2013-02-12 | 3M Innovative Properties Company | Hybrid sound absorbing sheet |
| US8573358B2 (en) | 2008-05-22 | 2013-11-05 | 3M Innovative Properties Company | Multilayer sound absorbing structure comprising mesh layer |
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