US20070034445A1 - Acoustic panel of the air sheet type - Google Patents

Acoustic panel of the air sheet type Download PDF

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Publication number
US20070034445A1
US20070034445A1 US11/496,491 US49649106A US2007034445A1 US 20070034445 A1 US20070034445 A1 US 20070034445A1 US 49649106 A US49649106 A US 49649106A US 2007034445 A1 US2007034445 A1 US 2007034445A1
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United States
Prior art keywords
acoustic panel
panel according
spacer
plates
central plate
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.)
Abandoned
Application number
US11/496,491
Inventor
Michel Pompei
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hutchinson SA
Original Assignee
Hutchinson SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Assigned to HUTCHINSON reassignment HUTCHINSON ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: POMPEI, MICHEL
Publication of US20070034445A1 publication Critical patent/US20070034445A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches

Definitions

  • the present invention relates to an acoustic panel of the air sheet type in which a spacer (or a plurality of spacers) hold(s) two plates (or a plurality of plates) apart.
  • the problem posed is to have a spacer of low weight and sufficient mechanical strength to ensure that the walls are well spaced apart while presenting a small area of contact with the plates so as to minimize transfers of sound and possibly also of heat between the plates.
  • the invention thus provides an acoustic panel presenting at least two plates, together with at least one spacer for holding said two plates apart and for forming at least one sheet of air, wherein said spacer is constituted by a woven or knitted element that presents embossing.
  • the embossing may be inclined, e.g. at 45°, relative to two opposite edges of the spacer.
  • the embossing may advantageously be performed in two dimensions.
  • the knitted or woven element may be in the form of a sleeve. It may be flattened so as to present two superposed embossed thicknesses.
  • the sleeve which constitutes the woven or knitted element forms a net in which a said plate is located, for example a central plate disposed between two outer plates, thereby defining two spacers and two sheets of air.
  • the woven or knitted element is advantageously a embossed wire fabric, in particular made of aluminum.
  • the central plate When the acoustic panel has a central plate and two outer plates separated by said spacer, it is advantageous for the central plate to be constituted by a foam, preferably a foam of melamine and/or by wool of low density in an aramid fiber cover.
  • the two outer plates may be made of a glass fiber and epoxy composite.
  • FIGS. 1 and 2 are respectively a section view of an acoustic panel in the embodiment of the invention and a view of a spacer in an embodiment of the invention, and
  • FIG. 3 shows the advantage provided by the spacer device relative to a panel without a sheet of air.
  • the acoustic panel shown in FIG. 1 comprises a central panel 1 of melamine foam, e.g. having a thickness of 5 millimeters (mm), and two outer plates 2 and 3 of five-ply glass fiber and epoxy composite.
  • the spacers 4 and 5 are constituted by a embossed knit of aluminum wire. In this case a rolled wire is used having a diameter of 0.37 mm, which wire is subsequently knitted and then embossed so as to give it a thickness of 2 mm to 4 mm, for example.
  • the acoustic panel as made in this way presents a total thickness of about 15 mm.
  • FIG. 2 is a detail view of the embossed knit.
  • the undulations constituted by the embossing have the effect of providing almost point contact between the wire and the plates.
  • the material constituting the knit or the fabric is selected as a function of constraints, in particular environmental constraints, for the intended application, however the material must be of a kind that enables it to be deformed mechanically when cold or when hot.
  • constraints in particular environmental constraints, for the intended application, however the material must be of a kind that enables it to be deformed mechanically when cold or when hot.
  • a metal or indeed a plastics material in particular a thermoplastic material.
  • a knit made in this way provides good spacing between the walls, while the spacer nevertheless remains sufficiently flexible to follow any rounded outline of the acoustic panel.
  • Aluminum also presents the combined advantage of good stiffness for relatively low weight, and of fireproofing.
  • the spacer of the invention avoids contact between the inside faces of the plates 2 and 3 and the faces of the central panel.
  • Using a metal and in particular using a fine loop size (e.g. of the order of a few mm), provides resistance against a non-grazing incident flame.
  • the embossed fabric or knit may be stuck to one of the two plates it separates or to both of them. It is also possible to omit any adhesive, in which case the sandwich can be held together via the outsides of the outer plates 2 and 3 .
  • the central plate 1 may be a block of acoustic foam (e.g. polyurethane foam).
  • the central plate 1 may also be made using glass wool, in particular low density glass wool, possibly contained in a fine cover of aramid fibers (“Mylar”).
  • FIG. 3 shows a damping test TL expressed in dB plotted up the ordinate as a function of frequency expressed in hertz along the abscissa.
  • Curve A applies to the panel of FIG. 1 (outer plates 2 and 3 of glass fiber and epoxy composite, central plate 1 of melamine foam, and spacers 4 and 5 of embossed aluminum wire knit), while curve B applies to the panel of FIG. 1 but in the absence of any spacer (panels 1 , 2 and 3 coming face to face).
  • damping is improved above a certain frequency (in this case 800 Hz) and in particular that the region in which damping decreases down to a low point situated around 2000 Hz is eliminated.
  • the acoustic panel shown in FIG. 1 (outer plates 2 and 3 of glass fiber and epoxy composite, central plate 1 of melamine foam, and spacers 4 and 5 of embossed aluminum wire knit), is suitable for passing the FA 25-863 test (applying a flame to the edge of the panel for 12 seconds (s)).
  • the melamine foam presents very good resistance to fire, as do the glass fiber and epoxy composite and the embossed aluminum wire knit, and the sheets of air on either side improve cooling.

Abstract

The invention relates to an acoustic panel presenting at least two plates together with at least one spacer for keeping said two plates spaced apart so as to form at least one sheet of air. In the panel, said spacer is constituted by a woven or knitted element, e.g. of aluminum wire, and it presents embossing.

Description

  • The present invention relates to an acoustic panel of the air sheet type in which a spacer (or a plurality of spacers) hold(s) two plates (or a plurality of plates) apart.
    • BACKGROUND OF THE INVENTION
  • It is known that the effectiveness of an absorptive material such as a porous material is increased if a sheet of air is created, in particular between the absorptive material and the wall that receives acoustic excitation.
    • OBJECT AND SUMMARY OF THE INVENTION
  • The problem posed is to have a spacer of low weight and sufficient mechanical strength to ensure that the walls are well spaced apart while presenting a small area of contact with the plates so as to minimize transfers of sound and possibly also of heat between the plates.
  • The invention thus provides an acoustic panel presenting at least two plates, together with at least one spacer for holding said two plates apart and for forming at least one sheet of air, wherein said spacer is constituted by a woven or knitted element that presents embossing.
  • The embossing may be inclined, e.g. at 45°, relative to two opposite edges of the spacer.
  • The embossing may advantageously be performed in two dimensions.
  • The knitted or woven element may be in the form of a sleeve. It may be flattened so as to present two superposed embossed thicknesses. Alternatively, the sleeve which constitutes the woven or knitted element forms a net in which a said plate is located, for example a central plate disposed between two outer plates, thereby defining two spacers and two sheets of air.
  • The woven or knitted element is advantageously a embossed wire fabric, in particular made of aluminum.
  • When the acoustic panel has a central plate and two outer plates separated by said spacer, it is advantageous for the central plate to be constituted by a foam, preferably a foam of melamine and/or by wool of low density in an aramid fiber cover.
  • The two outer plates may be made of a glass fiber and epoxy composite.
    • BRIEF DESCRIPTION OF THE DRAWING
  • Other characteristics and advantages of the invention appear better on reading the following description with reference to the accompanying drawing, in which:
  • FIGS. 1 and 2 are respectively a section view of an acoustic panel in the embodiment of the invention and a view of a spacer in an embodiment of the invention, and
  • FIG. 3 shows the advantage provided by the spacer device relative to a panel without a sheet of air.
    • MORE DETAILED DESCRIPTION
  • The acoustic panel shown in FIG. 1 comprises a central panel 1 of melamine foam, e.g. having a thickness of 5 millimeters (mm), and two outer plates 2 and 3 of five-ply glass fiber and epoxy composite. The spacers 4 and 5 are constituted by a embossed knit of aluminum wire. In this case a rolled wire is used having a diameter of 0.37 mm, which wire is subsequently knitted and then embossed so as to give it a thickness of 2 mm to 4 mm, for example.
  • The acoustic panel as made in this way presents a total thickness of about 15 mm.
  • FIG. 2 is a detail view of the embossed knit. The particular stitch used in unimportant: it is the embossing that serves to minimize contact between the outer plate 2 or 3 and the central plate 1 that provides sound insulation. The undulations constituted by the embossing have the effect of providing almost point contact between the wire and the plates.
  • The material constituting the knit or the fabric is selected as a function of constraints, in particular environmental constraints, for the intended application, however the material must be of a kind that enables it to be deformed mechanically when cold or when hot. For example, it is possible to select a metal or indeed a plastics material, in particular a thermoplastic material.
  • A knit made in this way provides good spacing between the walls, while the spacer nevertheless remains sufficiently flexible to follow any rounded outline of the acoustic panel.
  • Aluminum also presents the combined advantage of good stiffness for relatively low weight, and of fireproofing.
  • The spacer of the invention avoids contact between the inside faces of the plates 2 and 3 and the faces of the central panel.
  • Using a metal, and in particular using a fine loop size (e.g. of the order of a few mm), provides resistance against a non-grazing incident flame.
  • The embossed fabric or knit may be stuck to one of the two plates it separates or to both of them. It is also possible to omit any adhesive, in which case the sandwich can be held together via the outsides of the outer plates 2 and 3.
  • In a variant, the central plate 1 may be a block of acoustic foam (e.g. polyurethane foam). The central plate 1 may also be made using glass wool, in particular low density glass wool, possibly contained in a fine cover of aramid fibers (“Mylar”).
  • FIG. 3 shows a damping test TL expressed in dB plotted up the ordinate as a function of frequency expressed in hertz along the abscissa. Curve A applies to the panel of FIG. 1 ( outer plates 2 and 3 of glass fiber and epoxy composite, central plate 1 of melamine foam, and spacers 4 and 5 of embossed aluminum wire knit), while curve B applies to the panel of FIG. 1 but in the absence of any spacer ( panels 1, 2 and 3 coming face to face).
  • It can be seen that damping is improved above a certain frequency (in this case 800 Hz) and in particular that the region in which damping decreases down to a low point situated around 2000 Hz is eliminated.
  • The acoustic panel shown in FIG. 1 ( outer plates 2 and 3 of glass fiber and epoxy composite, central plate 1 of melamine foam, and spacers 4 and 5 of embossed aluminum wire knit), is suitable for passing the FA 25-863 test (applying a flame to the edge of the panel for 12 seconds (s)). The melamine foam presents very good resistance to fire, as do the glass fiber and epoxy composite and the embossed aluminum wire knit, and the sheets of air on either side improve cooling.

Claims (10)

1. An acoustic panel presenting at least two plates together with at least one spacer for keeping said two plates apart so as to form at least one sheet of air, wherein said spacer is constituted by a knitted element that is an embossed metal wire knit.
2. An acoustic panel according to claim 1, wherein the metal wire is made of aluminum.
3. An acoustic panel according to claim 1, wherein the embossing is inclined, e.g. at 45°, relative to two opposite edges of the spacer.
4. An acoustic panel according to claim 1, wherein the spacer is embossed in two dimensions.
5. An acoustic panel according to claim 1, wherein the knitted element is in the form of a sleeve that is flattened so as to present two superposed embossed thicknesses.
6. An acoustic panel according to claim 1, wherein the knitted element constitutes a net having one of said plates located therein.
7. An acoustic panel according to claim 1, presenting a central plate and two outer plates, the central plate and the outer plates being held spaced apart by said spacers.
8. An acoustic panel according to claim 7, wherein the central plate is of foam, in particular melamine foam.
9. An acoustic panel according to claim 7, wherein the central plate is of low density glass wool in a cover of aramid fibers.
10. An acoustic panel according to claim 8, wherein the two outer plates are of glass fiber and epoxy composite.
US11/496,491 2005-08-02 2006-08-01 Acoustic panel of the air sheet type Abandoned US20070034445A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0508264A FR2889616B1 (en) 2005-08-02 2005-08-02 ACOUSTIC PANEL OF TYPE A BLADE OF AIR
FR0508264 2005-08-02

Publications (1)

Publication Number Publication Date
US20070034445A1 true US20070034445A1 (en) 2007-02-15

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US11/496,491 Abandoned US20070034445A1 (en) 2005-08-02 2006-08-01 Acoustic panel of the air sheet type

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EP (1) EP1750250A1 (en)
FR (1) FR2889616B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018060059A1 (en) * 2016-09-30 2018-04-05 Phoncoat Gmbh Acoustic hood for musicians and office workers

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US1172710A (en) * 1908-05-09 1916-02-22 John E Howe Insulating-block for building purposes.
US1978473A (en) * 1933-02-11 1934-10-30 Novambere Bernard Structural section
US2043988A (en) * 1932-07-21 1936-06-16 Johns Manville Lightweight unit
US2148496A (en) * 1936-12-31 1939-02-28 Owens Corning Fiberglass Corp Installation of acoustical insulating material
US2419971A (en) * 1943-06-05 1947-05-06 Rumpf Herman Padding and soundproofing material
US3293107A (en) * 1963-01-30 1966-12-20 Container Corp Corrugated paperboard
US4227356A (en) * 1978-03-23 1980-10-14 Exxon Research & Engineering Co. Composite foam roof insulation
US4262050A (en) * 1978-09-01 1981-04-14 Jenkins Henry H Skin packaging substrate
US4641726A (en) * 1983-04-20 1987-02-10 Peabody Noise Control, Inc. Composite structure and method of manufacturing it
US4877671A (en) * 1987-03-13 1989-10-31 Bpco, Inc. Reducing shrinkage of phenolic foam composites
US4886696A (en) * 1988-05-10 1989-12-12 Manville Corporation Corrugated paperboard automotive liner
US5041323A (en) * 1989-10-26 1991-08-20 Rohr Industries, Inc. Honeycomb noise attenuation structure
US5057176A (en) * 1988-05-10 1991-10-15 Manville Corporation Method of forming corrugated paperboard automotive liner
US5149920A (en) * 1989-11-09 1992-09-22 Fiber-Lite Corporation Acoustical panel and method of making same
US5641950A (en) * 1988-03-28 1997-06-24 Quilite International Limited Liability Company Acoustical panel system
US5665943A (en) * 1995-06-15 1997-09-09 Rpg Diffusor Systems, Inc. Nestable sound absorbing foam with reduced area of attachment
US5768781A (en) * 1994-01-10 1998-06-23 Lydall, Inc. Method of making a metal heat insulator
US5866235A (en) * 1997-02-21 1999-02-02 Eften, Inc. All synthetic fiber interior trim substrate
US6155016A (en) * 1997-05-13 2000-12-05 Kvaerner Masa-Yards Oy Wall structure
US6186270B1 (en) * 1994-09-14 2001-02-13 M. Faist Gmbh & Co. Kg Layered sound absorber for absorbing acoustic sound waves
US6699540B1 (en) * 1999-07-23 2004-03-02 Japan Matex Kabushiki Kaisha Materials of packing and packing made from the materials
US20050126852A1 (en) * 2002-03-26 2005-06-16 Masahiko Nakajima Hollow structure plate, manufacturing method thereof, manufacturing device thereof, and sound absorbing structure plate
US20060124388A1 (en) * 2002-12-02 2006-06-15 Michel Pompei Double wall acoustic panel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH671546A5 (en) * 1986-09-26 1989-09-15 Matec Holding
DE3731417C1 (en) * 1987-09-18 1988-12-15 Pelz Ernst Erpe Vertrieb Insulating building board and method for its production
US7011181B2 (en) * 2003-07-08 2006-03-14 Lear Corporation Sound insulation system

Patent Citations (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1172710A (en) * 1908-05-09 1916-02-22 John E Howe Insulating-block for building purposes.
US2043988A (en) * 1932-07-21 1936-06-16 Johns Manville Lightweight unit
US1978473A (en) * 1933-02-11 1934-10-30 Novambere Bernard Structural section
US2148496A (en) * 1936-12-31 1939-02-28 Owens Corning Fiberglass Corp Installation of acoustical insulating material
US2419971A (en) * 1943-06-05 1947-05-06 Rumpf Herman Padding and soundproofing material
US3293107A (en) * 1963-01-30 1966-12-20 Container Corp Corrugated paperboard
US4227356A (en) * 1978-03-23 1980-10-14 Exxon Research & Engineering Co. Composite foam roof insulation
US4262050A (en) * 1978-09-01 1981-04-14 Jenkins Henry H Skin packaging substrate
US4641726A (en) * 1983-04-20 1987-02-10 Peabody Noise Control, Inc. Composite structure and method of manufacturing it
US4877671A (en) * 1987-03-13 1989-10-31 Bpco, Inc. Reducing shrinkage of phenolic foam composites
US5641950A (en) * 1988-03-28 1997-06-24 Quilite International Limited Liability Company Acoustical panel system
US4886696A (en) * 1988-05-10 1989-12-12 Manville Corporation Corrugated paperboard automotive liner
US5057176A (en) * 1988-05-10 1991-10-15 Manville Corporation Method of forming corrugated paperboard automotive liner
US5041323A (en) * 1989-10-26 1991-08-20 Rohr Industries, Inc. Honeycomb noise attenuation structure
US5149920A (en) * 1989-11-09 1992-09-22 Fiber-Lite Corporation Acoustical panel and method of making same
US5768781A (en) * 1994-01-10 1998-06-23 Lydall, Inc. Method of making a metal heat insulator
US6186270B1 (en) * 1994-09-14 2001-02-13 M. Faist Gmbh & Co. Kg Layered sound absorber for absorbing acoustic sound waves
US5665943A (en) * 1995-06-15 1997-09-09 Rpg Diffusor Systems, Inc. Nestable sound absorbing foam with reduced area of attachment
US5866235A (en) * 1997-02-21 1999-02-02 Eften, Inc. All synthetic fiber interior trim substrate
US6155016A (en) * 1997-05-13 2000-12-05 Kvaerner Masa-Yards Oy Wall structure
US6699540B1 (en) * 1999-07-23 2004-03-02 Japan Matex Kabushiki Kaisha Materials of packing and packing made from the materials
US20050126852A1 (en) * 2002-03-26 2005-06-16 Masahiko Nakajima Hollow structure plate, manufacturing method thereof, manufacturing device thereof, and sound absorbing structure plate
US20060124388A1 (en) * 2002-12-02 2006-06-15 Michel Pompei Double wall acoustic panel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018060059A1 (en) * 2016-09-30 2018-04-05 Phoncoat Gmbh Acoustic hood for musicians and office workers

Also Published As

Publication number Publication date
FR2889616B1 (en) 2008-05-30
EP1750250A1 (en) 2007-02-07
FR2889616A1 (en) 2007-02-09

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HUTCHINSON, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:POMPEI, MICHEL;REEL/FRAME:018689/0646

Effective date: 20060912

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION