EP1474798B1 - Soundproofing assembly and a part comprising a wall which is covered with said assembly - Google Patents

Soundproofing assembly and a part comprising a wall which is covered with said assembly Download PDF

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Publication number
EP1474798B1
EP1474798B1 EP03739524A EP03739524A EP1474798B1 EP 1474798 B1 EP1474798 B1 EP 1474798B1 EP 03739524 A EP03739524 A EP 03739524A EP 03739524 A EP03739524 A EP 03739524A EP 1474798 B1 EP1474798 B1 EP 1474798B1
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EP
European Patent Office
Prior art keywords
layer
assembly
resistivity
wall
assembly according
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EP03739524A
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German (de)
French (fr)
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EP1474798A1 (en
Inventor
Arnaud Duval
Guillaume Deshayes
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Adler Pelzer France Grand Est SAS
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Faurecia Automotive Industrie SAS
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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 invention relates to a soundproofing assembly, in particular for use in a motor vehicle, and a part comprising a wall covered by said assembly.
  • the object of the invention is to define a new solution optimizing the relationship between the quality of sound and the weight of the whole.
  • the first pair formed by the first and the second layers and the second pair formed by the third and the fourth thus defined are relatively complementary and combine their effects to obtain homogeneous results in the field of noise absorption as well as sound insulation over a wide frequency range.
  • the Applicant has determined that the first pair is particularly effective in absorbing not only the high frequencies (above 1000 Hz), but also the medium frequencies (between 400 Hz and 1000 Hz) for which the second pair is not very satisfactory and inversely the first couple has average qualities in sound insulation that are offset by the second couple that is relatively efficient in this area.
  • the solution of the invention is particularly suitable for the field of soundproofing of motor vehicles, especially for covering the floor, the trunk, the apron, the rear shelf and the door panels. Therefore, it is possible to obtain a reduction of weight between 15% and 35% approximately without reducing the perceived sound quality compared to the solutions of the prior art.
  • the first layer has a resistivity of between 100,000 Nm -4 .s and 400,000 Nm -4 .s and / or between 3 and 20 times the resistivity of the second layer.
  • the resistance to the passage of air of a layer is equal to the product of the resistivity of a layer by its thickness.
  • the fourth layer comprises a Young's modulus at least two times smaller than the Young's modulus of the second layer.
  • the invention relates to a part comprising in addition to the assembly, a rigid wall, said assembly at least partially covering said wall and among said four superimposed layers, the fourth layer being closest to the wall and the first layer being the further away from said wall.
  • FIG. 1 illustrates a part 1 comprising a rigid wall and a flexible assembly 10.
  • Said assembly 10 comprises a first layer 2, a second flexible layer 4, a third flexible layer 6 and a fourth flexible layer 8 superimposed and covering a substantially rigid wall 17 on which it is fixed.
  • the room 1 defines a space 15, such as a vehicle interior, to soundproof.
  • the first 2 and second 4 layers are breathable, while the third layer 6 is impervious to air.
  • the first layer 2 has a non-infinite resistance to the passage of air, but still high.
  • the first layer 2 has a greater resistivity than that of the second layer 4.
  • the third layer 6 and the fourth layer 8 process the solid and aerial sound radiated by the wall 17, in order to isolate said wall of the passenger compartment 15.
  • the acoustic waves remanent present in the passenger compartment 15 penetrate partially through the layer 2, then in the layer 4 forming acoustic spring where they are absorbed, the layer 6 forming a heavy mass, viscoelastic, mechanically inert and supported by the layer 8 also forming acoustic spring defining a barrier for acoustic waves.
  • the first layer 2 is here of substantially uniform constitution, particularly in terms of resistivity, over its entire thickness and is also the decorative layer of the part 1. It has a thickness greater than or equal to 4 millimeters, advantageously between 5 and 10 millimeters.
  • the first layer 2 may especially consist of glass, cotton or synthetic fibers (polyester, polypropylene, polyamide, acrylic) and polypropylene. Alternatively, it may also consist of a densified nonwoven, a needle punch or the like coated with latex. It is also possible to cover the first layer 2 of a decorative layer whose resistance to the passage of air is negligible compared to that of the first layer. This is the case of some velvets and some carpets.
  • the second layer and the fourth layer are advantageously each made of thermoplastic foam or felt. They can both be made in the same material, but this is not a necessity. Their density is advantageously between 15 kg / m 3 and 100 kg / m 3 . Their porosity (proportion of entrapped air for a given volume) is advantageously greater than 0.9 and preferably greater than 0.95. Each of the layers advantageously has a thickness of between 5 millimeters and 20 millimeters.
  • the heavy mass 6 advantageously comprises a thermoplastic material of polyolefin type (Ethylene Vinyl Acetate, PolyEthylene, Ethylene Propylene Diene Monomer) and incorporates waste type bitumen, chalk and / or barium sulfate to obtain a high density for little expensive.
  • Young's modulus is less than 1000 MPa, it has a density greater than or equal to 1500 kg / m 3 , preferably greater than or equal to 2000 kg / m 3 , a density of 0.2 kg / m 2 and 9 kg / m 2 and preferably a thickness of between 0.1 millimeter and 5 millimeters.
  • the thickness of the assembly 10 is advantageously between 15 millimeters and 50 millimeters.
  • the bond between the layers is obtained according to usual techniques, in particular by heat-sealing.
  • FIG. 2 illustrates a part 11 essentially different from the part 1 illustrated in FIG. 1 in that it comprises an assembly 20 differentiating from the assembly 10 in that the first layer 2 has been replaced by a first layer 12 comprising two parts 12 ', 12 "superimposed
  • the portion 12' could be constituted by a carpet support (needled coated full latex bath, for example), in other words a decorative layer of resistance to the passage of air not insignificant, and the portion 12 "of compressed fibers (for example compressed felt).
  • the invention is not limited to the embodiment which has just been described by way of non-limiting example.
  • the first layer 2, 12 could comprise more than two superposed parts.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Laminated Bodies (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Building Environments (AREA)
  • Exhaust Silencers (AREA)
  • Portable Power Tools In General (AREA)
  • Percussion Or Vibration Massage (AREA)

Abstract

A soundproofing assembly intended, in particular, to soundproof a motor vehicle. The inventive assembly includes four stacked layers, consisting respectively of: a first layer having an air resistance of between 500 and 2,000 N.m-3.s; a second porous, acoustic spring-type layer having a resistivity of between 10,000 N.m-4.s and 50,000 N.m-4.s; a third viscoelastic, airtight, heavy mass-type layer having a density that is greater than or equal to 1,500 Kg/m3 and a surface density of between 0.2 Kg/m2 and 9 Kg/m2; and a fourth porous, acoustic spring-type layer having a resistivity of between 10,000 N.m-4.s and 50,000 N.m-4.s.

Description

L'invention concerne un ensemble d'insonorisation, en particulier destiné à être utilisé dans un véhicule automobile, ainsi qu'une pièce comprenant une paroi recouverte par ledit ensemble.The invention relates to a soundproofing assembly, in particular for use in a motor vehicle, and a part comprising a wall covered by said assembly.

De multiples solutions ont déjà été proposées pour insonoriser un véhicule. En particulier, il est connu d'utiliser un complexe du type masse-ressort comprenant une couche viscoélastique, étanche à l'air, de densité élevée formant masse lourde et une couche poreuse à l'air formant ressort acoustique.Multiple solutions have already been proposed to soundproof a vehicle. In particular, it is known to use a mass-spring type complex comprising a viscoelastic layer, airtight, high density forming a heavy mass and a porous layer with air forming acoustic spring.

Une telle solution présente des caractéristiques d'insonorisation relativement bonnes et un coût relativement faible.Such a solution has relatively good soundproofing characteristics and a relatively low cost.

Toutefois, compte tenu de la part de ces insonorisants dans la masse totale des véhicules, les constructeurs ont cherché à en réduire la masse afin de réduire la consommation des véhicules.However, given the proportion of these soundproofing in the total mass of vehicles, manufacturers have sought to reduce their mass in order to reduce vehicle consumption.

Aussi, il a été proposé d'autres solutions et notamment d'utiliser à la place un complexe comprenant deux couches : l'une présentant une résistance au passage de l'air relativement élevée et l'autre, poreuse à l'air, formant ressort acoustique.Also, it has been proposed other solutions and in particular to use instead a complex comprising two layers: one having a relatively high resistance to the passage of air and the other, porous to the air, forming acoustic spring.

Cette solution consiste à remplacer la masse lourde étanche à l'air par une couche moins lourde présentant une résistance à l'air non plus infinie mais relativement élevée. Une telle solution divulguée notamment dans WO-A-98 18657 permet une réduction sensible de la masse d'insonorisant, mais elle n'apporte pas toujours une insonorisation d'excellente qualité.This solution consists in replacing the heavy airtight mass with a less heavy layer having an air resistance no longer infinite but relatively high. Such a solution disclosed in particular in WO-A-98 18657 allows a significant reduction of the mass of soundproofing, but it does not always provide a soundproofing of excellent quality.

Le document US-4 559 255 décrit un matériau acoustique absorbant formé de feuilles denses séparées par des couches poreuses, dans lequel la feuille dense de surface, par exemple de matière plastique ne formant pas de mousse, a des trous qui la traversent.The document U.S. 4,559,255 discloses an absorbent acoustic material formed of dense sheets separated by porous layers, wherein the dense surface sheet, for example of non-foamed plastic, has holes therethrough.

Pour remédier aux inconvénients de ces différentes solutions, l'objet de l'invention consiste à définir une nouvelle solution optimisant le rapport entre la qualité d'insonorisation et le poids de l'ensemble.To overcome the disadvantages of these different solutions, the object of the invention is to define a new solution optimizing the relationship between the quality of sound and the weight of the whole.

Pour ce faire, l'invention propose un ensemble comprenant quatre couches superposées constituées respectivement par :

  • une première couche présentant une résistance au passage de l'air comprise entre 500 et 2 000 N.m-3.s,
  • une deuxième couche poreuse, de type ressort acoustique, présentant une résistivité comprise entre 10 000 N.m-4.s et 50 000 N.m-4.s, la première couche recouvrant la deuxième couche,
  • une troisième couche, de type masse lourde, viscoélastique, étanche à l'air, de densité supérieure ou égale à 1 500 kg/m3, de masse surfacique comprise entre 0,2 kg/m2 et 9 kg/m2, la deuxième couche recouvrant la troisième couche,
  • une quatrième couche poreuse, de type ressort acoustique, présentant une résistivité comprise entre 10 000 N.m-4.s et 50 000 N.m-4.s, la troisième couche recouvrant la quatrième couche.
To do this, the invention proposes an assembly comprising four superimposed layers constituted respectively by:
  • a first layer having a resistance to the passage of air between 500 and 2000 Nm -3 .s,
  • a second porous acoustic spring type layer having a resistivity of between 10,000 Nm -4 .s and 50,000 Nm -4 .s, the first layer covering the second layer,
  • a third layer, of the heavy, viscoelastic, airtight mass, with a density greater than or equal to 1500 kg / m 3 , with a density of between 0.2 kg / m 2 and 9 kg / m 2 , the second layer covering the third layer,
  • a fourth porous, acoustic spring type layer having a resistivity of between 10,000 Nm -4 .s and 50,000 Nm -4. s, the third layer covering the fourth layer.

Le premier couple formé par la première et la deuxième couches et le deuxième couple formé par la troisième et la quatrième ainsi définis sont relativement complémentaires et combinent leurs effets pour obtenir des résultats homogènes tant dans le domaine de l'absorption des bruits que de l'isolation acoustique sur une large gamme de fréquence.The first pair formed by the first and the second layers and the second pair formed by the third and the fourth thus defined are relatively complementary and combine their effects to obtain homogeneous results in the field of noise absorption as well as sound insulation over a wide frequency range.

En effet, la demanderesse a déterminé que le premier couple se révèle particulièrement efficace pour absorber non seulement les hautes fréquences (au-dessus de 1000 Hz), mais aussi les moyennes fréquences (entre 400 Hz et 1 000 Hz) pour lesquelles le deuxième couple n'est pas très satisfaisant et qu'inversement le premier couple présente des qualités moyennes en isolation acoustique qui sont compensées par le deuxième couple qui est relativement performant dans ce domaine.Indeed, the Applicant has determined that the first pair is particularly effective in absorbing not only the high frequencies (above 1000 Hz), but also the medium frequencies (between 400 Hz and 1000 Hz) for which the second pair is not very satisfactory and inversely the first couple has average qualities in sound insulation that are offset by the second couple that is relatively efficient in this area.

Par conséquent, compte tenu des différents bruits relatifs aux véhicules automobiles, la solution de l'invention se révèle particulièrement adaptée au domaine de l'insonorisation des véhicules automobiles, notamment pour recouvrir le plancher, le coffre, le tablier, la tablette arrière et les panneaux de porte. Dès lors, il est possible d'obtenir une réduction de poids entre 15% et 35% environ sans réduire la qualité d'insonorisation perçue par rapport aux solutions de l'art antérieur.Therefore, given the various noises relating to motor vehicles, the solution of the invention is particularly suitable for the field of soundproofing of motor vehicles, especially for covering the floor, the trunk, the apron, the rear shelf and the door panels. Therefore, it is possible to obtain a reduction of weight between 15% and 35% approximately without reducing the perceived sound quality compared to the solutions of the prior art.

Selon une caractéristique complémentaire visant à optimiser l'absorption du premier couple de couches, la première couche a une résistivité comprise entre 100 000 N.m-4.s et 400 000 N.m-4.s et/ou comprise entre 3 et 20 fois la résistivité de la deuxième couche.According to a complementary feature designed to optimize the absorption of the first pair of layers, the first layer has a resistivity of between 100,000 Nm -4 .s and 400,000 Nm -4 .s and / or between 3 and 20 times the resistivity of the second layer.

A toutes fins utiles, il est précisé que la résistance au passage de l'air d'une couche est égale au produit de la résistivité d'une couche par son épaisseur.For all practical purposes, it is specified that the resistance to the passage of air of a layer is equal to the product of the resistivity of a layer by its thickness.

Selon une autre caractéristique avantageuse, conformément à l'invention, la quatrième couche comprend un module d'Young au moins deux fois inférieur au module d'Young de la deuxième couche.According to another advantageous characteristic, according to the invention, the fourth layer comprises a Young's modulus at least two times smaller than the Young's modulus of the second layer.

Il est ainsi possible de réduire le risque qu'un phénomène d'interférence (de coïncidence fréquentielle) se produise entre les deux couples de couches, ce qui permet d'améliorer encore l'insonorisation de la solution conforme à l'invention.It is thus possible to reduce the risk of interference (frequency coincidence) occurring between the two pairs of layers, which further improves the soundproofing of the solution according to the invention.

En outre, l'invention concerne une pièce comprenant outre l'ensemble, une paroi rigide, ledit ensemble recouvrant au moins partiellement ladite paroi et parmi lesdites quatre couches superposées, la quatrième couche étant la plus proche de la paroi et la première couche étant la plus éloignée de ladite paroi.In addition, the invention relates to a part comprising in addition to the assembly, a rigid wall, said assembly at least partially covering said wall and among said four superimposed layers, the fourth layer being closest to the wall and the first layer being the further away from said wall.

L'invention va apparaître encore plus clairement dans la description qui va suivre, faite en référence aux dessins annexés dans lesquels :

  • la figure 1 représente en coupe transversale un ensemble conforme à l'invention,
  • la figure 2 représente en coupe transversale une variante de l'ensemble de la figure 1.
The invention will appear even more clearly in the description which follows, made with reference to the appended drawings in which:
  • FIG. 1 represents in cross section an assembly according to the invention,
  • FIG. 2 represents in cross section a variant of the assembly of FIG. 1.

La figure 1 illustre une pièce 1 comprenant une paroi rigide et un ensemble souple 10. Ledit ensemble 10 comprend une première couche 2, une deuxième couche souple 4, une troisième couche souple 6 et une quatrième couche souple 8 superposées et recouvrant une paroi sensiblement rigide 17 sur laquelle il est fixé. La pièce 1 délimite un espace 15, tel qu'un habitacle de véhicule, à insonoriser.FIG. 1 illustrates a part 1 comprising a rigid wall and a flexible assembly 10. Said assembly 10 comprises a first layer 2, a second flexible layer 4, a third flexible layer 6 and a fourth flexible layer 8 superimposed and covering a substantially rigid wall 17 on which it is fixed. The room 1 defines a space 15, such as a vehicle interior, to soundproof.

La première 2 et la deuxième 4 couches sont perméables à l'air, tandis que la troisième couche 6 est imperméable à l'air. En outre, la première couche 2, présente une résistance non infinie au passage de l'air, mais malgré tout élevée. En particulier, la première couche 2 présente une résistivité supérieure à celle de la deuxième couche 4.The first 2 and second 4 layers are breathable, while the third layer 6 is impervious to air. In addition, the first layer 2, has a non-infinite resistance to the passage of air, but still high. In particular, the first layer 2 has a greater resistivity than that of the second layer 4.

Schématiquement, la troisième couche 6 et la quatrième couche 8 traitent le bruit solidien et à aérien rayonné par la paroi 17, afin d'isoler ladite paroi de l'habitacle 15. Les ondes acoustiques rémanentes, présentes dans l'habitacle 15 pénètrent pour partie à travers la couche 2, puis dans la couche 4 formant ressort acoustique où elles sont absorbées, la couche 6 formant masse lourde, viscoélastique, mécaniquement inerte et supportée par la couche 8 formant également ressort acoustique définissant une barrière pour les ondes acoustiques.Schematically, the third layer 6 and the fourth layer 8 process the solid and aerial sound radiated by the wall 17, in order to isolate said wall of the passenger compartment 15. The acoustic waves remanent present in the passenger compartment 15 penetrate partially through the layer 2, then in the layer 4 forming acoustic spring where they are absorbed, the layer 6 forming a heavy mass, viscoelastic, mechanically inert and supported by the layer 8 also forming acoustic spring defining a barrier for acoustic waves.

Bien entendu, cette présentation est simpliste. Elle illustre toutefois les fonctions principales remplies par chacune des couches.Of course, this presentation is simplistic. However, it illustrates the main functions performed by each layer.

La première couche 2 est ici de constitution sensiblement uniforme, en particulier en termes de résistivité, sur toute son épaisseur et constitue en outre la couche décor de la pièce 1. Elle présente une épaisseur supérieure ou égale à 4 millimètres, avantageusement entre 5 et 10 millimètres.The first layer 2 is here of substantially uniform constitution, particularly in terms of resistivity, over its entire thickness and is also the decorative layer of the part 1. It has a thickness greater than or equal to 4 millimeters, advantageously between 5 and 10 millimeters.

Elle peut notamment être constituée de fibres de verres, de coton ou synthétiques (polyester, polypropylène, polyamide, acrylique) et de polypropylène. En variante, elle peut également êtes constituée par un non-tissé densifié, un aiguilleté ou analogue enduit de latex. On peut également prévoir de recouvrir la première couche 2 d'une couche décor dont la résistance au passage de l'air est négligeable rapportée à celle de la première couche. Ceci est le cas de certains velours et de certaines moquettes.It may especially consist of glass, cotton or synthetic fibers (polyester, polypropylene, polyamide, acrylic) and polypropylene. Alternatively, it may also consist of a densified nonwoven, a needle punch or the like coated with latex. It is also possible to cover the first layer 2 of a decorative layer whose resistance to the passage of air is negligible compared to that of the first layer. This is the case of some velvets and some carpets.

La deuxième couche et la quatrième couche sont avantageusement chacune constituée de mousse thermoplastique ou de feutre. Elles peuvent toutes deux être réalisées dans la même matière, mais cela n'est pas une nécessité. Leur densité est avantageusement comprise entre 15 kg/m3 et 100 kg/m3. Leur porosité (proportion d'air emprisonné pour un volume donné) est avantageusement supérieure à 0,9 et de préférence supérieure à 0,95. Chacune des couches présente avantageusement une épaisseur comprise entre 5 millimètres et 20 millimètres.The second layer and the fourth layer are advantageously each made of thermoplastic foam or felt. They can both be made in the same material, but this is not a necessity. Their density is advantageously between 15 kg / m 3 and 100 kg / m 3 . Their porosity (proportion of entrapped air for a given volume) is advantageously greater than 0.9 and preferably greater than 0.95. Each of the layers advantageously has a thickness of between 5 millimeters and 20 millimeters.

La masse lourde 6 comprend avantageusement un matériau thermoplastique de type polyoléfine (Ethylène Vinyle Acétate, PolyEthylène, Ethylène Propylène Diène Monomère) et incorpore des déchets du type bitume, craie et/ou sulfate de baryum permettant d'obtenir une densité élevée pour peu cher. Son module d'Young est inférieur à 1 000 MPa, elle présente une densité supérieure ou égale à 1 500 kg/m3, de préférence supérieure ou égale à 2 000 kg/m3, une masse surfacique comprise entre 0,2 kg/m2 et 9 kg/m2 et avantageusement une épaisseur comprise entre 0,1 millimètre et 5 millimètres.The heavy mass 6 advantageously comprises a thermoplastic material of polyolefin type (Ethylene Vinyl Acetate, PolyEthylene, Ethylene Propylene Diene Monomer) and incorporates waste type bitumen, chalk and / or barium sulfate to obtain a high density for little expensive. Its Young's modulus is less than 1000 MPa, it has a density greater than or equal to 1500 kg / m 3 , preferably greater than or equal to 2000 kg / m 3 , a density of 0.2 kg / m 2 and 9 kg / m 2 and preferably a thickness of between 0.1 millimeter and 5 millimeters.

L'épaisseur de l'ensemble 10 est avantageusement comprise entre 15 millimètres et 50 millimètres.The thickness of the assembly 10 is advantageously between 15 millimeters and 50 millimeters.

La liaison entre les couches est obtenue selon des techniques usuelles, notamment par thermocollage.The bond between the layers is obtained according to usual techniques, in particular by heat-sealing.

La figure 2 illustre une pièce 11 se distinguant essentiellement de la pièce 1 illustrée à la figure 1 en ce qu'elle comprend un ensemble 20 se différenciant de l'ensemble 10 en ce que la première couche 2 a été remplacée par une première couche 12 comprenant deux parties 12', 12" superposées. Tel qu'illustré, à titre d'exemple, la partie 12' pourrait être constituée par un support de moquette (aiguilleté enduit plein bain de latex par exemple), autrement dit une couche décor de résistance au passage de l'air non négligeable, et la partie 12" de fibres comprimées (par exemple feutre comprimé).FIG. 2 illustrates a part 11 essentially different from the part 1 illustrated in FIG. 1 in that it comprises an assembly 20 differentiating from the assembly 10 in that the first layer 2 has been replaced by a first layer 12 comprising two parts 12 ', 12 "superimposed As illustrated, for example, the portion 12' could be constituted by a carpet support (needled coated full latex bath, for example), in other words a decorative layer of resistance to the passage of air not insignificant, and the portion 12 "of compressed fibers (for example compressed felt).

Bien entendu, l'invention n'est nullement limitée à la réalisation qui vient d'être décrite à titre d'exemple non limitatif. Ainsi, la première couche 2, 12 pourrait comprendre plus de deux parties superposées.Of course, the invention is not limited to the embodiment which has just been described by way of non-limiting example. Thus, the first layer 2, 12 could comprise more than two superposed parts.

Claims (8)

  1. Assembly (10, 20) for sound-proofing in particular a motor vehicle, having four superimposed layers comprising:
    - a first layer (2, 12) having a resistance to air passage of between 500 and 2,000 N.m-3.s, and
    - a second porous layer (4) of the acoustically resilient member type having a resistivity of between 10,000 N.m-4.s and 50,000 N.m-4.s, the first layer covering the second layer,
    characterised in that it further comprises
    - a third viscoelastic, air-tight layer (6) of the heavy mass type having a density greater than or equal to 1,500 kg/m3 and a surface mass of between 0.2 kg/m2 and 9 kg/m2, the second layer covering the third layer, and
    - a fourth porous layer (8) of the acoustically resilient member type having a resistivity of between 10,000 N.m-4.s and 50,000 N.m-4.s, the third layer covering the fourth layer.
  2. Assembly according to claim 1, characterised in that the first layer has a resistivity of between 100,000 N.m-4.s and 400,000 N.m-4.s.
  3. Assembly according to claim 1 or claim 2, characterised in that the first layer has a resistivity of between 3 and 20 times the resistivity of the second layer.
  4. Assembly according to any one of the preceding claims, characterised in that the third layer has a Young's modulus of less than 1,000 MPa and a density of greater than or equal to 2,000 kg/m3.
  5. Assembly according to any one of the preceding claims, characterised in that the fourth layer comprises a Young's modulus which is at least two times less than the Young's modulus of the second layer.
  6. Assembly according to any one of the preceding claims, characterised in that the second layer and the fourth layer are constituted by thermoplastic foam and/or felt and have a density of between 15 kg/m3 and 100 kg/m3.
  7. Assembly according to any one of the preceding claims, characterised in that the third layer comprises a thermoplastic material of the polyolefin type and incorporates waste products of the bitumen, chalk and/or barium sulphate type.
  8. Component (1, 11) comprising a rigid wall (17) and an assembly (10, 20) according to any one of the preceding claims, said assembly at least partially covering said wall and, among said four superimposed layers, the fourth layer (8) being the layer nearest the wall and the first layer (2, 12) being the layer furthest away from said wall.
EP03739524A 2002-02-11 2003-02-11 Soundproofing assembly and a part comprising a wall which is covered with said assembly Expired - Lifetime EP1474798B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0201648A FR2835955B1 (en) 2002-02-11 2002-02-11 SOUNDPROOFING ASSEMBLY AND PART COMPRISING A WALL COVERED BY SAID ASSEMBLY
FR0201648 2002-02-11
PCT/FR2003/000430 WO2003069596A1 (en) 2002-02-11 2003-02-11 Soundproofing assembly and a part comprising a wall which is covered with said assembly

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EP1474798A1 EP1474798A1 (en) 2004-11-10
EP1474798B1 true EP1474798B1 (en) 2008-01-16

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WO2003069596A1 (en) 2003-08-21
JP2005517983A (en) 2005-06-16
US7201253B2 (en) 2007-04-10
JP4126018B2 (en) 2008-07-30
DE60318681D1 (en) 2008-03-06
DE60318681T2 (en) 2009-01-15
ES2300595T3 (en) 2008-06-16
EP1474798A1 (en) 2004-11-10
WO2003069596A8 (en) 2003-10-23
US20050103564A1 (en) 2005-05-19
FR2835955A1 (en) 2003-08-15
FR2835955B1 (en) 2004-07-16
ATE384324T1 (en) 2008-02-15

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