EP1911018A1 - Couche d'insonorisation et complexe d1insonorisation incorporant celle-ci - Google Patents
Couche d'insonorisation et complexe d1insonorisation incorporant celle-ciInfo
- Publication number
- EP1911018A1 EP1911018A1 EP06794280A EP06794280A EP1911018A1 EP 1911018 A1 EP1911018 A1 EP 1911018A1 EP 06794280 A EP06794280 A EP 06794280A EP 06794280 A EP06794280 A EP 06794280A EP 1911018 A1 EP1911018 A1 EP 1911018A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- heavy
- soundproofing
- fibrous
- spring
- 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.)
- Granted
Links
Classifications
-
- 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
- G10K11/165—Particles in a matrix
Definitions
- the present invention relates to a soundproofing layer and a complex integrating this layer.
- noises Every motor vehicle produces noises in a wide range of frequencies. These noises have multiple origins; noises can be created by the engine, the aerodynamic noise of the friction of the air on the vehicle, the noise of the rolling of the vehicle on the road.
- soundproofing complexes cover the floor of the passenger compartment and the deck wall that separates the passenger compartment engine.
- soundproofing complexes encapsulate the engine compartment.
- the acoustic treatment mainly concerns inner wing guards.
- these soundproofing complexes can act according to two modes of action.
- the soundproofing complexes can, on the one hand, act to achieve acoustic insulation, that is to say, to prevent noise from entering the volume concerned.
- the acoustic treatment by insulation is mainly used for the soundproofing of the cabin and, in some applications under hood (soundproofing of water box) and external (inner wing protector).
- soundproofing complexes can, on the other hand, act by acoustic absorption, that is to say by absorption and dissipation of the sounds that propagate from different sources (engine, gearbox, wheel, etc.). .
- the main noise sources treated by sound absorption are those located under the bonnet.
- a conventional acoustic insulation treatment obtained by a soundproofing complex, such as a cabin carpet intended to cover the floor of a vehicle or an apron intended to cover the sheet which separates the engine from the passenger compartment, combines a couple called "spring-mass".
- This type of complex in general, combines:
- a layer of a material with low resistance to the passage of air called a "spring” which may be a polyurethane foam or, optionally, a fibrous material, and
- “heavy mass” is impermeable to air and water. It consists of a thermoplastic (PE 1 PP, EVA, PVC) or crosslinked polymer (EPDM, rubber and derivatives) and a high proportion of mineral fillers in order to provide the "mass" effect necessary for the insulation acoustic. This type of layer provides no acoustic absorption because of the tightness provided by the "heavy mass” polymer.
- the acoustic performance of a complex thus defined is a function of the density and the thickness of the spring layer and the grammage of the "heavy mass” layer.
- the soundproofing products must also provide mechanical properties adapted to the application.
- the complexes that cover the floor of the passenger compartment must also have mechanical properties in terms of lift, resistance to tearing and compression since they are exposed trim elements.
- Acoustic treatment means are known which combine insulation and absorption and which act for the soundproofing of the passenger compartment.
- EP-A-0934180 proposes, in particular, a porous spring-mass system for obtaining a passenger side absorption.
- the system is characterized by the combination of a densified fibrous layer with high resistance to the passage of air and a fibrous layer with low resistance to the passage of air.
- the system obtained makes it possible to provide acoustic absorption on the passenger side, at the expense of acoustic insulation which is less effective than a traditional sealed heavyweight system due to the low density level of the densified fibrous layer.
- the document FR-A-2859477 describes a porous soundproofing system where the level of porosity is managed by a controlled deposit of polyolefin on the surface of one of the fibrous layers.
- the dusting process makes it possible to differentiate the quantity of powder deposited on one of the layers in order to locally optimize the acoustic properties.
- the location of the dusting acts effectively on the porosity of the felt but brings no gain in terms of mechanical properties on the cabin carpet function.
- the soundproofing performance depends largely on the mass of the complex.
- the compromise between the total mass of the vehicle and acoustic soundproofing performance can be at the expense of acoustic performance because the mass of a vehicle can not be increased without limit.
- the soundproofing complexes are moreover composed of materials derived from petroleum chemistry, which means that their costs can be very fluctuating and generally tend to increase. It can further be noted that current soundproofing complexes that incorporate polymerizable materials have manufacturing times that can be significant.
- An object of the invention is to provide a soundproofing material that acts effectively in terms of insulation and absorption. Another object of the invention is to provide a soundproofing material which also has a mechanical strength.
- Another object of the invention is to provide a complex soundproofing system that can ensure localized acoustic and mechanical performance.
- Another object of the invention is therefore to provide an acoustic soundproofing complex that can be recycled at a lower cost.
- the invention relates to a porous layer heavy soundproofing comprising fibers entangled with polymeric particles and hot melt binder fibers amalgamating the polymer particles and fibers.
- the basis of the invention is to provide a fiber-based soundproofing layer which, because of the intrinsic porosity of the fibers, acts as an absorption and based on polymeric particles which give the soundproofing layer an effect of insulation; this insulating effect is obtained thanks to the polymer particles which ensure densification of the heavy porous layer and give it the necessary mass effect.
- the heavy porous layer may have a density of between 150 and 1500 kg / m 3 . It can be noted that this density is obtained while maintaining a certain flexibility.
- the heavy porous layer according to the invention differs radically from known fibrous layers of the felt type whose density can be increased only by increasing compaction; this compaction induces a decrease in the flexibility of the felt and, consequently, a decrease in the mechanical and acoustic damping ability of the sound-absorbing felt.
- the heavy porous layer is defined by at least one parameter of the group comprising
- At least one of these parameters may have a rate of change per unit area.
- one or more parameters defining the heavy porous layer has a gradient per unit area which has the effect of allowing a localized action on noise foci.
- the heavy porous layer may itself be defined to be superimposed precisely on this mapping.
- the heavy porous layer may comprise polymeric particles having a density of between 500 and 2000 kg / m 3 .
- the polymeric particles have a substantially lamellar shape whose ratio of the length to the thickness is between 5 and 100. This geometry makes it possible to ensure a large contact area between each polymeric particle and the hot-melt fibers, which allows to obtain a set having a strong cohesion.
- the minimum particle size of the polymer particles is of the order of 1 mm.
- the particle size of the polymer particles is between 3 mm and 30 mm; this range makes it possible, in fact, a satisfactory cohesion of the fibrous structure.
- the invention also relates to a soundproofing complex comprising a layer of heavy porous material on which is superposed a fibrous layer forming a spring.
- the fibrous spring layer comprises fibers blended with hot melt fibers.
- the latter is defined by at least one of the parameters of the group comprising
- At least one of these parameters may have a variation rate per unit area.
- the fibrous spring layer may also, and independently of the heavy porous layer, have one or more parameters having a gradient per unit area which has the effect of allowing localized action on noise foci.
- the complex thus defined can be parameterized according to a sound map of a vehicle in terms of isolation by acting mainly on the definition of the layer porous heavy and / or in terms of absorption by acting mainly on the fibrous layer spring.
- Controlling the gradients per unit area of one or more parameters that characterize the fibrous layer forming spring also has the effect of allowing a localized action on the mechanical performance of the sound-absorbing complex.
- the complex thus defined can be parameterized locally in mechanical terms according to the stresses specific to certain areas of the complex.
- the complex comprises a textile layer of appearance superimposed on the heavy porous layer.
- the complex comprises a sealed or controlled porosity layer positioned between the layer of the appearance textile and the porous heavy layer.
- the complex may comprise a sealed or controlled porosity layer positioned either between the appearance textile layer and the porous heavy layer or between the porous heavy layer and the spring fibrous layer.
- Figures 1 and 2 show an embodiment of a heavy porous layer respectively before and after compaction
- Figure 3 shows, on an enlarged scale, an entanglement of a polymeric particle in a fibrous network
- FIG. 4 is a graph illustrating the density at constant compaction pressure of two embodiments of a heavy porous layer according to the invention with respect to a conventional fibrous layer,
- FIG. 5 is a graph representing the insulation slope between 315 and 3150 Hz of a heavy layer as a function of its density
- Figures 6 and 7 show an embodiment of a heavy porous layer respectively before and after compaction with additional local supply of material
- Figures 8 and 9 show an embodiment of a fibrous layer spring respectively before and after compaction with additional local supply of material
- FIG. 10 shows an embodiment of a complex integrating the heavy porous layer with the fibrous layer forming a spring according to the invention
- Figures 11 and 12 show two examples of soundproofing complex incorporating a sealed layer or controlled porosity, according to two types of preferred positioning.
- the heavy porous layer 2 according to the invention consists of synthetic or natural frayed textile fibers 4 which are entangled with polymeric particles 5; we also note the presence of binder fibers 6 whose function is to ensure the cohesion of this layer and forms a network that traps the polymeric particles 5.
- the frayed textile fibers 4 may be fibers from textile recycling. It may be synthetic fibers (acrylic, polyester) or possibly natural (cotton) which have a relatively low apparent density of the order of 0.02.
- These frayed textile fibers 4 behave in a relatively inert manner and have, as their main object, to confer its volume on the heavy porous layer 2.
- An advantage of integrating these frayed textile fibers 4 into the heavy porous layer 2 is their very low cost and their high availability.
- a second constituent of the heavy porous layer 2 which can also come from recycling consists of the polymeric particles 5.
- particles 5 resulting from shredding of industrial polymeric material belonging, for example, to the family of elastomers (EPDM type, EVA, rubber and derivatives) or thermoplastics (type PP, PE, PVC or other).
- Particles means small irregular pieces which are obtained by shredding or crushing polymer waste.
- These particles 5 may be substantially flat and may have dimensions of the order of 3 to 30 millimeters. The fact that the particles 5 have irregular shapes and their surface has roughness proves to be a favorable point insofar as the asperities act as gripping elements with respect to the fibers 4.
- the particles can be used directly after their shredding or grinding operation without any treatment.
- the particles may be relatively calibrated but it may also be envisaged to use particles having a wide variety of sizes.
- a third component which is used in the manufacture of the heavy porous layer 2 consists of binder fibers 6 hot melt.
- binder fibers 6 may consist of bi-component polyester fiber, polypropylene or polyamide. These hot-melt binder fibers 6 are entangled with the frayed textile fibers 4 and the particles 5 and provide the strength and the cohesion of the heavy porous layer 2.
- the hot-melt binder fibers 6 form a network within the heavy porous layer 2 in which each point of contact between two binder fibers 6 constitutes a link point of the network.
- the particles may be derived from tire grinding. In this case at the end of the grinding operation, fragments of fibers that enter into the composition of the tires may remain present on the surface of the particles 5. The presence of these filaments is a favorable point since it improves the entanglement and the adhesion of particles 5 in the network of binder fibers 6 hot melt and frayed textile fibers 4.
- each particle 5 is trapped individually in the network of binding fibers 6.
- the cohesion of the heavy porous layer 2, that is to say its ability not to disaggregate, is very important.
- the great specificity of the heavy porous layer according to the invention is that it incorporates polymeric particles whose function is to densify a fibrous structure which inherently has a low density.
- FIG. 1 shows the entanglement of fibers 4, particles 5 and binder fibers 6 prior to hot compaction, which makes it possible to obtain a final layer illustrated in FIG.
- FIG. 4 illustrates the fact that the contribution of the polymer particles makes it possible to double the density of a layer integrating the latter with respect to a purely fibrous layer.
- Column 61 of FIG. 4 represents a purely fibrous soundproofing structure having a reference density of 100; the columns 62 and 63 represent, at the same compacting pressure, the density of a heavy porous layer 2 respectively integrating particles of 600 kg / m 3 and 1000 kg / m 3 .
- FIG. 5 represents an insulation slope as a function of the density of a layer.
- the influence of the density - and thus the interest of maximizing the latter - on the insulation slope is easily measured.
- the heavy porous layer 2 may, in practice, have a basis weight of the order of 4 kg / m 2 for a thickness of 3 mm, which makes it a truly heavy layer which has a very significant sealing effect.
- the heavy porous layer 2 remains, nevertheless, flexible and can, therefore, be easily shaped to adapt to the geometric constraints of a vehicle in which it will take place.
- the heavy porous layer 2 can be used alone since it combines, at the same time, an insulation effect thanks to its high density which is conferred on it by the polymeric particles and an absorption effect thanks to its porous nature which it is conferred by the fibers.
- the heavy porous layer 2 may, for example, be used to double the inner face of a bonnet.
- the air flow resistivity range of the porous heavy layer may range from 5,000 to 3,000,000 Nm " 5s, and more specifically from 20,000 to 1,500,000 Nm ' 5s.
- the heavy porous layer 2 can, moreover, be implemented in a very specific manner which is illustrated in FIGS. 6 and 7.
- the heavy porous layer is shaped to conform to the shape of the floor of the vehicle ; it has a strongly left-hand surface which has a transmission tunnel A, as well as locations B for the feet of the passengers also called cellar with feet.
- the heavy porous layer 2 may also be required to integrate a reservation C to form a storage trap.
- it may be envisaged to provide an additional supply of fibers 4, and / or particles 5 and / or binder fibers 6 for, in a particular zone of layer 2 (tunnel zone A in the example of Figure 6), change the soundproofing capacity of the layer after forming ( Figure 7).
- the thickness e1 of fibers 4, and / or particles 5 and / or binder fibers 6 in the tunnel zone A is greater than the thickness e2 of zone B.
- the spring fibrous layer 3 comprises frayed textile fibers and hot melt binder fibers.
- the fibrous spring layer may also incorporate foam waste.
- the heavy porous layer 2 and the fibrous layer spring 3 are superimposed and their bond is made by their respective hot melt fibers.
- a layer 8 of carpet-like appearance textile there is also provided.
- a tight layer or controlled porosity 10 may optionally be positioned between two layers of the complex to improve the acoustic efficiency of the sound-insulating complex in terms of insulation.
- the invention provides for the possible use of a such sealing layer 10 positioned between the layer 8 of the appearance textile and the porous heavy layer 2 or between the porous heavy layer 2 and the fibrous layer spring 3.
- the soundproofing complex has, in practice, several significant advantages over the soundproofing complex which, for the most part, are multi-material assemblies working mainly in terms of simple acoustic insulation.
- a very significant advantage of this complex is that it can integrate areas of higher density to provide local noise treatment, which allows to propose a complex in line with specific soundproofing needs.
- Figure 10 is schematically shown a soundproofing complex according to the invention shaped in a floor mat application.
- the complex which incorporates a heavy porous layer 2 and a fibrous spring layer 3 can be three-dimensionally shaped to suit the particular shape of the floor surface.
- the fibrous spring layer 3 provides a significant mechanical strength in terms of lift. This is important since, firstly, the handling of the complex, including its installation, is facilitated and, secondly, it avoids the phenomenon of depression of the feet of a passenger in the floor mat.
- the thickness (denoted e) and / or the density (denoted m v ) of each of the fibrous and fibrous layers 2 spring 3 can present a rate of change; in other words, the complex can be precisely adapted according to geometric or acoustic requirements.
- the density and thickness parameters of the heavy porous layer 2 and of the fibrous layer 3 can take the following values:
- the complex acts both as an insulator and as an absorbent.
- the insulation is mainly obtained by the combination of the heavy porous layer 2 with the spring fibrous layer 3.
- the insulation levels achieved are higher than those of the known fibrous sound-absorbing complexes; this result is obtained thanks to the high density of the heavy porous layer 2.
- a sealing layer 10 positioned between two layers 2 and 3 as shown in FIG. 12 or between the heavy porous layer 2 and the appearance textile layer 8.
- the complex according to the invention is entirely fibrous and, as such, is easily recyclable. Its recycling can also be carried out by a textile recycling system which implements essentially mechanical means (shredding, grinding, carding ).
- the complex according to the invention is therefore recyclable but its main constituents can themselves be recycled, which has a very favorable impact on its cost.
- the method according to the invention makes it possible to ensure a localized and independent management of the thickness and / or the density of each of the constituent layers of the complex and thus, ultimately, to produce a complex whose properties of Soundproofing, in terms of insulation and in terms of absorption, and the mechanical properties, in terms of lift, compressive strength and tearing, can be modulated according to the acoustic and mechanical requirements locally requested.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0508293A FR2889617B1 (fr) | 2005-08-03 | 2005-08-03 | Couche d'insonorisation et complexe d'insonorisation incorporant celle-ci |
| PCT/FR2006/001889 WO2007015014A1 (fr) | 2005-08-03 | 2006-08-03 | Couche d'insonorisation et complexe d1insonorisation incorporant celle-ci |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1911018A1 true EP1911018A1 (fr) | 2008-04-16 |
| EP1911018B1 EP1911018B1 (fr) | 2017-11-22 |
Family
ID=36389065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06794280.5A Active EP1911018B1 (fr) | 2005-08-03 | 2006-08-03 | Couche d'insonorisation et complexe d1insonorisation incorporant celle-ci |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1911018B1 (fr) |
| CN (1) | CN101238507A (fr) |
| FR (1) | FR2889617B1 (fr) |
| MX (1) | MX2008001648A (fr) |
| WO (1) | WO2007015014A1 (fr) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2919420B1 (fr) * | 2007-07-23 | 2009-11-13 | Mecaplast Sa | Produit d'insonorisation autoportant |
| FR2922676B1 (fr) * | 2007-10-23 | 2013-09-06 | Cera | Complexe de protection acoustique comprenant une couche poreuse densifiee |
| FR2923643B1 (fr) * | 2007-11-12 | 2009-12-11 | Faurecia Automotive Ind | Element etanche et ensemble d'insonorisation ayant une fonction de decor poreux |
| FR2932308B1 (fr) * | 2008-06-10 | 2010-08-13 | Mecaplast Sa | Produit et complexe d'insonorisation et d'isolation thermique autoportants. |
| FR2939144B1 (fr) * | 2008-11-28 | 2010-12-24 | C Gex Systems | Composition de particules thermofusibles auto-agrippantes et procede de collage mettant en oeuvre une telle composition |
| FR3024675B1 (fr) | 2014-08-06 | 2017-03-31 | Faurecia Automotive Ind | Procede de fabrication d'une piece d'equipement automobile et piece associee |
| FR3078040B1 (fr) * | 2018-02-22 | 2020-03-13 | Faurecia Automotive Industrie | Piece d'insonorisation de vehicule automobile et procede de fabrication associe |
| EP3570274A1 (fr) * | 2018-05-16 | 2019-11-20 | Igor Emri | Élément d'isolation sonore |
| CN116438340B (zh) * | 2020-10-29 | 2024-11-19 | 三菱电机株式会社 | 吸音材料 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1242072A (fr) * | 1985-08-26 | 1988-09-20 | Rolland Belisle | Methode et produit pour insonoriser les murs et plafonds d'une maison ou d'un batiment |
| DE19722997C2 (de) * | 1997-06-02 | 2002-04-18 | Sai Automotive Tdw Gmbh | Akustisch wirksames Dämmstoffmaterial und Verkleidungsteil und Verfahren zu seiner Herstellung |
| DE20100632U1 (de) * | 2001-01-12 | 2002-02-28 | Fritz Egger Ges.M.B.H., St. Johann | Schalldämmmatte |
| JP3941745B2 (ja) * | 2003-06-03 | 2007-07-04 | 豊田合成株式会社 | 外装材を備えたアンダープロテクター |
-
2005
- 2005-08-03 FR FR0508293A patent/FR2889617B1/fr not_active Expired - Lifetime
-
2006
- 2006-08-03 EP EP06794280.5A patent/EP1911018B1/fr active Active
- 2006-08-03 CN CNA2006800287467A patent/CN101238507A/zh active Pending
- 2006-08-03 MX MX2008001648A patent/MX2008001648A/es not_active Application Discontinuation
- 2006-08-03 WO PCT/FR2006/001889 patent/WO2007015014A1/fr not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2007015014A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1911018B1 (fr) | 2017-11-22 |
| CN101238507A (zh) | 2008-08-06 |
| FR2889617B1 (fr) | 2008-03-14 |
| FR2889617A1 (fr) | 2007-02-09 |
| MX2008001648A (es) | 2008-02-19 |
| WO2007015014A1 (fr) | 2007-02-08 |
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