EP2171709A1 - Produit d'insonorisation autoportant - Google Patents
Produit d'insonorisation autoportantInfo
- Publication number
- EP2171709A1 EP2171709A1 EP08835951A EP08835951A EP2171709A1 EP 2171709 A1 EP2171709 A1 EP 2171709A1 EP 08835951 A EP08835951 A EP 08835951A EP 08835951 A EP08835951 A EP 08835951A EP 2171709 A1 EP2171709 A1 EP 2171709A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- soundproofing
- product
- soundproofing product
- fibers
- proportion
- 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.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 title claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 44
- 239000000835 fiber Substances 0.000 claims abstract description 38
- 239000011230 binding agent Substances 0.000 claims abstract description 18
- 239000000945 filler Substances 0.000 claims abstract description 10
- 229920000642 polymer Polymers 0.000 claims abstract description 10
- 239000012943 hotmelt Substances 0.000 claims abstract description 9
- 239000003365 glass fiber Substances 0.000 claims description 13
- 239000012783 reinforcing fiber Substances 0.000 claims description 13
- 239000004753 textile Substances 0.000 claims description 8
- 239000006260 foam Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 2
- 230000000750 progressive effect Effects 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 8
- 230000002787 reinforcement Effects 0.000 abstract 2
- 238000010521 absorption reaction Methods 0.000 description 17
- 239000010410 layer Substances 0.000 description 10
- 239000011521 glass Substances 0.000 description 5
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920002292 Nylon 6 Polymers 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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 product, in particular for a motor vehicle.
- a motor vehicle produces noises in a wide range of frequencies. These noises have multiple origins: noise created by the engine, aerodynamic noise of the friction of the air on the vehicle, noise of the rolling of the vehicle on the road.
- the acoustic insulation treatment is mainly used for the soundproofing of the passenger compartment and, in some applications under hood (soundproofing of water box) and external (inner wing protector).
- soundproofing products can, on the other hand, act by acoustic absorption, that is to say by absorption and dissipation of the sounds that propagate from different source sources (engine, gearbox, wheel, etc.). .
- the main noise sources treated by sound absorption are those located under the bonnet.
- This material can, however, be of reduced use insofar as it has a low mechanical strength and is therefore mainly used in dubbing, for example, a water box.
- the lack of mechanical strength of this material which also has very good soundproofing performance, limits its use to the soundproofing of surfaces on which it can come to bear. It is also known to produce multilayer soundproofing products.
- This first layer is preformed by needling. It can also be colored.
- the second layer that is not visible is not colored.
- the second layer is deposited on the first layer during a second operation.
- the second layer also traps small cells.
- the wheel arch protection element shown by this document is therefore complex to manufacture since it imposes at least two distinct operations of forming a first and at least a second layer.
- This document describes an element that includes a soul each face of which is provided with a film.
- An object of the invention is to provide a soundproofing product that acts effectively in terms of insulation and absorption and which, moreover, is self-supporting.
- a soundproofing product that acts effectively in terms of insulation and absorption and which, moreover, is self-supporting.
- the subject of the present invention is essentially a monolayer self-supporting soundproofing product which comprises a filler material and reinforcing fibers entangled with polymeric particles and thermofusible binder fibers that amalgamate the polymer particles with the filler fibers and the reinforcing fibers ensuring product self-support.
- a specificity of the soundproofing product according to the invention is to integrate polymeric particles whose function is to densify a fibrous structure which has by nature a low density and to integrate reinforcing fibers which give the product of soundproofing its mechanical strength.
- the filler material may be from recycled textile materials and the polymer particles may be particles obtained, for example, by grinding used tires.
- the product may have a single layer which greatly simplifies the manufacture.
- the product according to the invention can be manufactured in a single operation.
- the reinforcing fibers are glass fibers.
- the reinforcing fibers are present in the soundproofing product with a mass proportion of between 10% and 50%, which makes it possible to ensure the mechanical strength of the soundproofing product and makes the self-supporting soundproofing product .
- the hot melt binder fibers are present in the soundproofing product with a proportion of between 10% and 30%. This range of proportion ensures the cohesion of the soundproofing product.
- the soundproofing product may have a density of between 150 and 1500 kg / m 3.
- the self-supporting soundproofing product is defined by at least one parameter of the group comprising:
- the self-supporting soundproofing product may comprise polymeric particles with 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.
- the minimum particle size of the polymer particles is of the order of 1 mm and, preferably, the particle size of the polymer particles is between 3 mm and 30 mm.
- the soundproofing product has progressive characteristics of thickness and / or density and / or composition.
- the soundproofing product has zones of apparent density differentiated.
- This arrangement makes it possible, for example, to provide peripheral zones of high density for, for example, fastening means of the rivet, screw or stud type, which can thus retain the soundproofing product without risk of breaking it.
- This arrangement also allows for central portions for example cross which behaves like ribs and stiffen the product.
- FIG. 1 shows an embodiment of a soundproofing product according to the invention in the form of a soundproofing product
- FIGs 2 and 3 show the structure of the soundproofing product according to the invention respectively in its zones A and B of Figure 1,
- Figures 4 and 5 show, on an enlarged scale, entanglement of the polymeric particles in a fibrous network with two types of filler material
- Figure 6 is a graph showing the absorption coefficient as a function of rigidity for soundproofing products of the state of the art and for several alternative embodiments of the soundproofing product according to the invention; the rigidity being characterized by a measurement of force in flexion three points on sample to reach an arrow of 5 centimeters.
- the soundproofing product 1 consists of synthetic or natural frayed textile fibers 4 and glass fibers 3 which are entangled with polymeric particles 5; the presence of binder fibers 6 is also noted whose function is to ensure the cohesion of this layer and form a network which traps the polymeric particles.
- 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 soundproofing product 1.
- An advantage of the integration of these frayed textile fibers 4 in the soundproofing product 1 is their very low cost and their high availability.
- Another component of the soundproofing product 1 which can also come from recycling consists of the polymer particles 5.
- particles 5 resulting from shredding of industrial polymeric material belonging, for example, to the family of elastomers (type EPDM, EVA, rubber and derivatives) or thermoplastics (type PP 1 PE, PVC or other).
- particles are meant small irregular pieces which are obtained by shredding or grinding the 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 choice of the particle size of the particles 5 may depend on of the aspect that one wishes to give to the soundproofing product.
- the selection of particles having a size close to the lower limit of the above-mentioned range leads to a sound-absorbing product with a smoother appearance than the choice of larger particles, which leads to a soundproofing product with a rougher appearance.
- 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 which have a wide variety of sizes and shapes.
- the soundproofing product also incorporates reinforcing fibers 3 which can be fiberglass in a proportion ranging from 10% to 50%. These reinforcing fibers may have a relatively large length of the order of 15 mm to 100 mm so as to create a tufted entanglement.
- Another 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 bicomponent polyester fibers, polypropylene, polyamide or polyester.
- These hot-melt binder fibers 6 are mixed with the frayed textile fibers 4, the glass fibers 3 and the particles 5 and provide the strength and cohesion of the soundproofing product.
- the hot-melt binder fibers 6 form a network within the soundproofing product 1 in which each point of contact between two binder fibers 6 constitutes a connection point of the network.
- each particle 5 is trapped individually in a network of frayed fibers 4 and glass fibers 3, the cohesion of which is ensured by the binder fibers 6.
- the cohesion of the soundproofing product 1 according to the invention that is to say its ability not to disaggregate, is very important.
- the soundproofing product according to the invention incorporates polymeric particles whose function is to densify a fibrous structure which, by nature, has a low density and that it incorporates glass fibers 3 which give the soundproofing product its mechanical strength.
- the soundproofing product as shown in Figure 1 has areas A and B which have differentiated properties.
- zone A has a low sound absorption coefficient and a high rigidity; this high rigidity is related to a high bulk density of the order of 700 kg / m 3 .
- Zone B has a high sound absorption capacity and a low rigidity for a low apparent density in the order of 130 kg / m 3 .
- the sealant has a significant absorption coefficient (of the order of 85%) and also has a rigidity of order of 7 N / 5cm.
- FIG. 2 shows the entanglement of frayed fibers 4, glass fibers 3, particles 5 and binder fibers 6 in zone A of the soundproofing product of FIG. 1.
- the forming of compacting in a mold and under a flow of hot air makes it possible to densify the soundproofing product and to melt the periphery of section of the binder fibers 6 so as to create soldering points at each point of contact between two binder fibers.
- the forming can be done at a temperature of the order of 110 0 C to 250 0 C depending on the nature of the binder fibers.
- FIG. 3 shows the entanglement of frayed fibers 4, glass fibers 3, particles 5 and binder fibers 6 in zone B of the soundproofing product of FIG. 1.
- this zone B has a apparent density lower than that of the sound-absorbing product in zone A; this higher apparent density can be obtained by forming which compaction is less important than that used to obtain zone A.
- FIG. 4 shows on an enlarged scale the product according to the invention.
- FIG. 5 shows an alternative embodiment in which the filling material comprises frayed fibers 4, but also fragments 7 of foam, in particular alveolar foam.
- a soundproofing product 1 such as that shown in section in FIG. 1 can therefore be implemented autonomously in the form of a soundproofing product since the glass fibers 3 give it a mechanical strength; the sealant can therefore be implemented without external support.
- the soundproofing product according to the invention can therefore find a large number of applications on a motor vehicle, in particular, the soundproofing product can find uses under the hood, under the wings or inside the passenger compartment. .
- the insulation product may have deep embossings and may have characteristics boy Wut
- the density of the soundproofing product has an evolutionary density since the value mv 1 of the density of the soundproofing product 1 at the level of the zone A is greater than the value mv 2 of the density in zone B. It is possible to obtain zones having a variation of the density within the same soundproofing product by varying the air gap between the two elements of a tool of forming.
- the soundproofing product 1 At the periphery of the soundproofing product 1 or in point or extended areas in the center of the product, it may be advantageous for the product to be more particularly resistant. It is therefore important that, in its peripheral zone and / or in certain zones, the soundproofing product has a mechanical strength which allows fasteners such as screws, rivets or studs to ensure the fixing of the product. soundproofing that resists vibration and other mechanical stresses.
- the soundproofing product can, by apparent density variations, have mechanical properties equivalent to those of structural parts, for example plastic, while also having acoustic properties
- the graph shown in Figure 6 shows the remarkable properties of the soundproofing product according to the invention in terms of absorption coefficient and rigidity vis-à-vis a soundproofing product having a structure exclusively composed of fibers of glass bound by a phenolic thermosetting resin and a soundproofing product having a structure composed of injected polyamide 6 material reinforced with 15% of glass fibers.
- the measurements shown in the graph of FIG. 6 were obtained by producing specimens in the above-mentioned three materials (product according to the invention, phenolic resin-bonded glass fiber, injected material PA-6 reinforced with 15% glass) whose dimensions are 150 mm by 50 mm.
- the test pieces thus produced were each subjected to a bending test consisting of placing each test piece on two supports 100 mm apart and exerting a mechanical action at an equal distance from the two supports.
- the soundproofing product according to the invention has a coefficient of absorption of the order of 85% while having a rigidity of the order of 7N / 5cm.
- the soundproofing product according to the invention can be put in competition with glass / phenolic products.
- the glass / phenolic products are disqualified in terms of mechanical strength since it is found that the rigidity is then only 5 N / 5 cm at most which is very insufficient to consider the implementation autonomous of such a product.
- the soundproofing product according to the invention can be implemented with variable density values ranging for example from 130 kg / m3 to 700 kg / m3. In this density range, the soundproofing product according to the invention retains soundproofing properties that are satisfactory and compatible with an application in the automotive field and stiffness values that make it possible to use the soundproofing product independently.
- a soundproofing product of PA-6 including 15% of glass fibers has a high rigidity but is devoid of any absorption property.
- the soundproofing product according to the invention is therefore particularly suitable for automobile soundproofing applications and can be for example shaped as a distribution casing, soundproofing oil sump, soundproofing engine block, cache style ...
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0705345A FR2919420B1 (fr) | 2007-07-23 | 2007-07-23 | Produit d'insonorisation autoportant |
PCT/FR2008/001090 WO2009044005A1 (fr) | 2007-07-23 | 2008-07-23 | Produit d'insonorisation autoportant |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2171709A1 true EP2171709A1 (fr) | 2010-04-07 |
Family
ID=39146880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08835951A Withdrawn EP2171709A1 (fr) | 2007-07-23 | 2008-07-23 | Produit d'insonorisation autoportant |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2171709A1 (fr) |
FR (1) | FR2919420B1 (fr) |
WO (1) | WO2009044005A1 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030124940A1 (en) * | 2001-12-31 | 2003-07-03 | Michael Rajendran S. | Tunable or adjustable liner for selectively absorbing sound energy and related methods |
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 |
DE102004053751A1 (de) * | 2004-11-06 | 2006-05-11 | Seeber Ag & Co. Kg | Akustik-Verkleidungsteil für ein Fahrzeug |
FR2889617B1 (fr) * | 2005-08-03 | 2008-03-14 | Mecaplast Sa | Couche d'insonorisation et complexe d'insonorisation incorporant celle-ci |
-
2007
- 2007-07-23 FR FR0705345A patent/FR2919420B1/fr active Active
-
2008
- 2008-07-23 EP EP08835951A patent/EP2171709A1/fr not_active Withdrawn
- 2008-07-23 WO PCT/FR2008/001090 patent/WO2009044005A1/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009044005A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2919420B1 (fr) | 2009-11-13 |
WO2009044005A1 (fr) | 2009-04-09 |
FR2919420A1 (fr) | 2009-01-30 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20091204 |
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AX | Request for extension of the european patent |
Extension state: AL BA MK RS |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: PIERCY, RICHARD Inventor name: NABETH, BRUNO |
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17Q | First examination report despatched |
Effective date: 20100923 |
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DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SILAC |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: FAURECIA INTERIEURS MORNAC |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20150714 |