EP3294591A1 - Method for producing an acoustic protection panel intended to be fitted facing a noisy and hot source of a vehicle - Google Patents

Method for producing an acoustic protection panel intended to be fitted facing a noisy and hot source of a vehicle

Info

Publication number
EP3294591A1
EP3294591A1 EP16729023.8A EP16729023A EP3294591A1 EP 3294591 A1 EP3294591 A1 EP 3294591A1 EP 16729023 A EP16729023 A EP 16729023A EP 3294591 A1 EP3294591 A1 EP 3294591A1
Authority
EP
European Patent Office
Prior art keywords
parts
panel
fibrous layer
core
screen
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Withdrawn
Application number
EP16729023.8A
Other languages
German (de)
French (fr)
Inventor
Laurent Waxin
Olivier Vitrant
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.)
Treves Products Services and Innovation SAS
Original Assignee
Cera APS SAS
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
Application filed by Cera APS SAS filed Critical Cera APS SAS
Publication of EP3294591A1 publication Critical patent/EP3294591A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • B60R13/0815—Acoustic or thermal insulation of passenger compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • B60R13/0838—Insulating elements, e.g. for sound insulation for engine compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • B60R13/0876—Insulating elements, e.g. for sound insulation for mounting around heat sources, e.g. exhaust pipes

Definitions

  • the invention relates to a method of producing an acoustic protection panel intended to be mounted facing a sound source and hot motor vehicle and a panel obtained by such a method.
  • a screen comprising a fibrous and porous layer of thermal insulation and a metal foil - in particular aluminum - of heat reflection,
  • the thermal protection screen is intended to protect the soul from the heat released by the source.
  • the fact that it is made by thermocompression involves a limitation to the geometry that can be conferred on it, the molded core can instead adopt a complex geometry, adapted in particular to the geometry of the source.
  • the invention aims to overcome this disadvantage.
  • the invention provides a method of producing an acoustic protection panel intended to be mounted facing a sound source and hot vehicle, said method comprising the following steps:
  • a screen comprising two parts, said parts being arranged relative to each other in a first configuration for their demolding, said parts each comprising a fibrous and porous layer of thermal insulation and a metal foil - in particular aluminum - of heat reflection,
  • the screen is made by thermocompression in a first configuration chosen to allow its demolding, said screen being then overmolded by the core to be in the second configuration corresponding to that it adopts once integrated into the sign.
  • the invention proposes a panel obtained by such a method.
  • FIG. 1 is a schematic representation in section of a panel according to a first embodiment
  • FIG. 2 is a diagrammatic representation in section of the screen of the panel of FIG. 1 represented at the end of the thermocompression step, in a configuration allowing it to be demolded,
  • FIG. 3 is a schematic representation in section of a panel according to a second embodiment
  • FIG. 4 is a diagrammatic representation in section of the screen of the panel of FIG. 3 represented at the end of the thermocompression step, in a configuration allowing it to be demolded.
  • a screen 4 comprising two parts 7a, 7b, said parts being arranged relative to each other in a first configuration ( Figures 2 and 4) for their release, said parts each comprising a fibrous layer 5 and porous thermal insulation and a metal sheet 6 - in particular aluminum - of heat reflection, Placing side by side said parts in a second mold whose molding cavity corresponds to the geometry of said panel to be obtained, so that said parts can, by plating against the wall - in particular because of the thrust exerted by the foam - Of said cavity, adopt a second configuration ( Figures 1 and 3) corresponding to said geometry, said fibrous layer being turned towards the inside of said cavity,
  • the two parts 7a, 7b are separate and arranged side by side in overlap.
  • the fibrous layer 5 is supercharged in each portion 7a, 7b in the overlap zone so as to avoid an excess thickness of the screen 4 in said zone.
  • the two parts 7a, 7b are in one piece, the thermocompression producing a thinned linear zone 8 where the fibrous layer 5 is supercharged, so as to form a flexible hinge allowing an angular displacement of said parts, one for each relative to the other to pass from the first to the second configuration of the screen 4.
  • a panel 1 made by such a method said panel comprising, arranged one on the other:
  • a core 2 molded based on porous polyurethane foam, so as to allow an acoustic absorption of the noise from said source, said core having a face 3 intended to be turned towards said source,
  • thermo-compressed thermal protection screen 4 covering at least part of said face, said screen comprising:
  • said screen being made of at least two parts 7a, 7b disposed side by side in juxtaposition so as to provide continuous thermal protection of two contiguous areas of said face.
  • the screen 4 extends on the slice 1 1 of the core 2.
  • the two parts 7a, 7b are separate and arranged side by side in overlap.
  • the two parts 7a, 7b are in one piece, said parts being associated with each other via a thinned linear zone 8 where the fibrous layer 5 is supercharged, so as to forming a flexible hinge allowing an angular displacement of said parts relative to each other before overmolding by the core 2.
  • the foam of the core 2 has a resistance to the passage of air of between 1000 and 1500 Nsnrr 3 . According to one embodiment, the foam of the core 2 has a density of between 0.22 and 0.28, and in particular between 0.23 and 0.27.
  • the fibers of the fibrous layer 5 are mineral fibers - in particular glass, silica or rock, the type of fibers being chosen according to the expected thermal conductivity characteristics for said layer.
  • the fibrous layer 5 has a thermal conductivity of between 0.055 and 0.061 Wr -1 .K- 1 at 200 ° C, and especially between 0.057 and 0.059 Wm- 1 .K- 1 .
  • the fibrous layer 5 has a resistance to the passage of air below 4000 Nsnrr 3 .
  • the fibrous layer 5 has a thickness of between 3 and 6 mm. According to one embodiment, the fibrous layer 5 has a density of between 600 and 1000 g / m 2 .
  • the fibers of the fibrous layer 5 are bonded together by a resin, in particular thermosetting resin, for example phenolic resin.
  • the bond between the sheet 6 and the fibrous layer 5 can be provided by the resin.
  • the fibers of the fibrous layer 5 are bonded together by needling without adding resin, which facilitates the recycling of the panel 1 at the end of life.
  • the fibrous layer 5 is coated with a layer of nonwoven interlayer 9 interposed between said fibrous layer and the core 2.
  • the metal sheet 6 may be provided with a plurality of micro-perforations, the surface density of micro perforations being in particular between 400,000 and 600,000 micro-perforations per m 2 .
  • the metal sheet 6 has a thickness of between 50 and 150 microns, and especially between 70 and 100 microns, a thickness as small contributing to the lightening of the screen 4.
  • the sheet 6 can be embossed so that it can be stretched.
  • the core 2 has a face opposite to the face 3 intended to be exposed to the source, said opposite face being devoid of waterproof coating, so as to optimize the expected acoustic absorption.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The invention relates to a method involving the following steps: using thermocompression to create, in a first mould (20), a screen (4) comprising two parts (7a, 7b) arranged relative to one another in a first configuration that allows them to be released from the mould, said parts each comprising a fibrous and porous thermal insulation layer (5) and a heat-reflecting metal sheet (6); placing said parts side by side in juxtaposition in a second mould the moulding cavity of which corresponds to the geometry of said panel that is to be obtained, so that said parts can, by being pressed firmly against the wall of said cavity, adopt a second configuration corresponding to said geometry, said fibrous layer facing toward the inside of said cavity; injecting into said cavity a mixture that is a precursor of foam, so as to form a core (2) overmoulding said fibrous layer; then, after the foam has expanded, releasing said panel obtained from the mould.

Description

Procédé de réalisation d'un panneau de protection acoustique destiné à être monté en regard d'une source sonore et chaude de véhicule  Method of producing an acoustic protection panel intended to be mounted opposite a sound source and hot vehicle
L'invention concerne un procédé de réalisation d'un panneau de protection acoustique destiné à être monté en regard d'une source sonore et chaude de véhicule automobile et un panneau obtenu par un tel procédé. The invention relates to a method of producing an acoustic protection panel intended to be mounted facing a sound source and hot motor vehicle and a panel obtained by such a method.
Il est connu de mettre en œuvre un procédé de réalisation d'un panneau de protection acoustique destiné à être monté en regard d'une source sonore et chaude de véhicule, ledit procédé comprenant les étapes suivantes : It is known to implement a method of producing an acoustic protection panel intended to be mounted facing a sound source and hot vehicle, said method comprising the following steps:
• réaliser par thermocompression dans un premier moule un écran, ledit écran comprenant une couche fibreuse et poreuse d'isolation thermique et une feuille métallique - notamment en aluminium - de réflexion de la chaleur,  • by thermocompression in a first mold a screen, said screen comprising a fibrous and porous layer of thermal insulation and a metal foil - in particular aluminum - of heat reflection,
· disposer ledit écran dans un deuxième moule dont la cavité de moulage correspond à la géométrie dudit panneau à obtenir, ladite couche fibreuse étant tournée vers l'intérieur de ladite cavité,  · Arranging said screen in a second mold whose molding cavity corresponds to the geometry of said panel to be obtained, said fibrous layer being turned towards the inside of said cavity,
• injecter dans ladite cavité un mélange précurseur de mousse, de manière à réaliser une âme surmoulant ladite couche fibreuse,  Injecting into said cavity a precursor mixture of foam, so as to produce a core overmolding said fibrous layer,
· après expansion de la mousse, démouler ledit panneau obtenu.  After expansion of the foam, demolding said panel obtained.
L'écran de protection thermique est destiné à protéger l'âme de la chaleur dégagée par la source. Le fait qu'il soit réalisé par thermocompression implique une limitation à la géométrie qui peut lui être conférée, l'âme moulée pouvant en revanche adopter une géométrie complexe, adaptée en particulier à la géométrie de la source. The thermal protection screen is intended to protect the soul from the heat released by the source. The fact that it is made by thermocompression involves a limitation to the geometry that can be conferred on it, the molded core can instead adopt a complex geometry, adapted in particular to the geometry of the source.
En particulier, il peut s'avérer impossible de protéger la tranche de l'âme, ce qui oblige à concevoir un panneau dans lequel l'âme est pourvue en sa périphérie d'un chanfrein permettant d'éviter l'exposition de sa tranche à la chaleur. Il en résulte une moindre capacité de l'âme à assurer sa fonction d'absorption acoustique. In particular, it may be impossible to protect the slice of the soul, which requires to design a panel in which the soul is provided in its periphery with a chamfer to avoid the exposure of its edge to the heat. This results in a lower capacity of the soul to ensure its sound absorption function.
L'invention a pour but de pallier cet inconvénient. The invention aims to overcome this disadvantage.
A cet effet, et selon un premier aspect, l'invention propose un procédé de réalisation d'un panneau de protection acoustique destiné à être monté en regard d'une source sonore et chaude de véhicule, ledit procédé comprenant les étapes suivantes : For this purpose, and according to a first aspect, the invention provides a method of producing an acoustic protection panel intended to be mounted facing a sound source and hot vehicle, said method comprising the following steps:
· réaliser par thermocompression dans un premier moule un écran comprenant deux parties, lesdites parties étant disposées l'une par rapport à l'autre selon une première configuration permettant leur démoulage, lesdites parties comprenant chacune une couche fibreuse et poreuse d'isolation thermique et une feuille métallique - notamment en aluminium - de réflexion de la chaleur,  Thermocompression in a first mold a screen comprising two parts, said parts being arranged relative to each other in a first configuration for their demolding, said parts each comprising a fibrous and porous layer of thermal insulation and a metal foil - in particular aluminum - of heat reflection,
• disposer en juxtaposition côte à côte lesdites parties dans un deuxième moule dont la cavité de moulage correspond à la géométrie dudit panneau à obtenir, de sorte que lesdites parties puissent, par placage contre la paroi de ladite cavité, adopter une deuxième configuration correspondant à ladite géométrie, ladite couche fibreuse étant tournée vers l'intérieur de ladite cavité,  Placing side by side said portions in a second mold whose molding cavity corresponds to the geometry of said panel to be obtained, so that said parts can, by plating against the wall of said cavity, adopt a second configuration corresponding to said geometry, said fibrous layer being turned towards the inside of said cavity,
• injecter dans ladite cavité un mélange précurseur de mousse, de manière à réaliser une âme surmoulant ladite couche fibreuse,  Injecting into said cavity a precursor mixture of foam, so as to produce a core overmolding said fibrous layer,
• après expansion de la mousse, démouler ledit panneau obtenu.  After expansion of the foam, demolding said panel obtained.
Avec un tel procédé, l'écran est réalisé par thermocompression dans une première configuration choisie pour permettre son démoulage, ledit écran étant ensuite surmoulé par l'âme pour se mettre dans la deuxième configuration correspondant à celle qu'il adopte une fois intégré dans le panneau. With such a method, the screen is made by thermocompression in a first configuration chosen to allow its demolding, said screen being then overmolded by the core to be in the second configuration corresponding to that it adopts once integrated into the sign.
On peut ainsi conférer à l'écran une géométrie qui n'aurait pu être réalisée si le premier moule, servant à sa thermocompression, avait été conformé selon la deuxième configuration qui aurait empêché - ou du moins fortement gêné - son démoulage, par exemple de par l'absence de dépouille - voire de par l'existence d'une contre-dépouille. It is thus possible to give the screen a geometry that could not have been achieved if the first mold, used for its thermocompression, had been shaped according to the second configuration which would have prevented - or at least strongly impeded - its demolding, for example by the absence of remains - or even by the existence of an undercut.
En particulier, il est possible de protéger la tranche de l'âme, ce qui permet d'éviter la réalisation d'un chanfrein en sa périphérie, et donc permet d'optimiser les propriétés d'absorption acoustique de ladite âme. In particular, it is possible to protect the edge of the core, which avoids the realization of a chamfer at its periphery, and thus optimizes the sound absorption properties of said core.
Selon un deuxième aspect, l'invention propose un panneau obtenu par un tel procédé. According to a second aspect, the invention proposes a panel obtained by such a method.
D'autres particularités et avantages de l'invention apparaîtront dans la description qui suit, faite en référence aux figures jointes, dans lesquelles : Other features and advantages of the invention will appear in the description which follows, made with reference to the appended figures, in which:
• la figure 1 est une représentation schématique en coupe d'un panneau selon une première réalisation,  FIG. 1 is a schematic representation in section of a panel according to a first embodiment,
· la figure 2 est une représentation schématique en coupe de l'écran du panneau de la figure 1 représenté à l'issue de l'étape de thermocompression, dans une configuration permettant son démoulage, FIG. 2 is a diagrammatic representation in section of the screen of the panel of FIG. 1 represented at the end of the thermocompression step, in a configuration allowing it to be demolded,
• la figure 3 est une représentation schématique en coupe d'un panneau selon une deuxième réalisation, FIG. 3 is a schematic representation in section of a panel according to a second embodiment,
· la figure 4 est une représentation schématique en coupe de l'écran du panneau de la figure 3 représenté à l'issue de l'étape de thermocompression, dans une configuration permettant son démoulage.  FIG. 4 is a diagrammatic representation in section of the screen of the panel of FIG. 3 represented at the end of the thermocompression step, in a configuration allowing it to be demolded.
En référence aux figures, on décrit un procédé de réalisation d'un panneau 1 de protection acoustique destiné à être monté en regard d'une source sonore et chaude de véhicule, ledit procédé comprenant les étapes suivantes : Referring to the figures, there is described a method of producing a sound protection panel 1 intended to be mounted facing a sound source and hot vehicle, said method comprising the following steps:
• réaliser par thermocompression dans un premier moule 20 un écran 4 comprenant deux parties 7a, 7b, lesdites parties étant disposées l'une par rapport à l'autre selon une première configuration (figures 2 et 4) permettant leur démoulage, lesdites parties comprenant chacune une couche fibreuse 5 et poreuse d'isolation thermique et une feuille 6 métallique - notamment en aluminium - de réflexion de la chaleur, • disposer en juxtaposition côte à côte lesdites parties dans un deuxième moule dont la cavité de moulage correspond à la géométrie dudit panneau à obtenir, de sorte que lesdites parties puissent, par placage contre la paroi - notamment du fait de la poussée exercée par la mousse - de ladite cavité, adopter une deuxième configuration (figures 1 et 3) correspondant à ladite géométrie, ladite couche fibreuse étant tournée vers l'intérieur de ladite cavité, • by thermocompression in a first mold 20 a screen 4 comprising two parts 7a, 7b, said parts being arranged relative to each other in a first configuration (Figures 2 and 4) for their release, said parts each comprising a fibrous layer 5 and porous thermal insulation and a metal sheet 6 - in particular aluminum - of heat reflection, Placing side by side said parts in a second mold whose molding cavity corresponds to the geometry of said panel to be obtained, so that said parts can, by plating against the wall - in particular because of the thrust exerted by the foam - Of said cavity, adopt a second configuration (Figures 1 and 3) corresponding to said geometry, said fibrous layer being turned towards the inside of said cavity,
• injecter dans ladite cavité un mélange précurseur de mousse, de manière à réaliser une âme 2 surmoulant ladite couche fibreuse,  Injecting into said cavity a precursor mixture of foam, so as to produce a core 2 overmolding said fibrous layer,
· après expansion de la mousse, démouler ledit panneau obtenu.  After expansion of the foam, demolding said panel obtained.
Selon la réalisation représentée en figure 1 , les deux parties 7a,7b sont distinctes et disposées côte à côte en chevauchement. En particulier, la couche fibreuse 5 est surcomprimée dans chaque partie 7a, 7b dans la zone de chevauchement de manière à éviter une surépaisseur de l'écran 4 dans ladite zone. According to the embodiment shown in Figure 1, the two parts 7a, 7b are separate and arranged side by side in overlap. In particular, the fibrous layer 5 is supercharged in each portion 7a, 7b in the overlap zone so as to avoid an excess thickness of the screen 4 in said zone.
Selon la réalisation représentée en figure 3, les deux parties 7a,7b sont monobloc, la thermocompression réalisant une zone rectiligne amincie 8 où la couche fibreuse 5 est surcomprimée, de manière à former une charnière souple permettant un débattement angulaire desdites parties l'une par rapport à l'autre pour passer de la première à la deuxième configuration de l'écran 4. On décrit à présent un panneau 1 réalisé par un tel procédé ledit panneau comprenant, disposés l'un sur l'autre : According to the embodiment shown in FIG. 3, the two parts 7a, 7b are in one piece, the thermocompression producing a thinned linear zone 8 where the fibrous layer 5 is supercharged, so as to form a flexible hinge allowing an angular displacement of said parts, one for each relative to the other to pass from the first to the second configuration of the screen 4. We now describe a panel 1 made by such a method said panel comprising, arranged one on the other:
• une âme 2 moulée à base de mousse de polyuréthanne poreuse, de manière à permettre une absorption acoustique du bruit issu de ladite source, ladite âme présentant une face 3 destinée à être tournée vers ladite source,  A core 2 molded based on porous polyurethane foam, so as to allow an acoustic absorption of the noise from said source, said core having a face 3 intended to be turned towards said source,
• un écran 4 de protection thermique thermo-comprimé recouvrant au moins en partie ladite face, ledit écran comprenant : A thermo-compressed thermal protection screen 4 covering at least part of said face, said screen comprising:
• une couche fibreuse 5 et poreuse d'isolation thermique, ladite couche étant surmoulée par ladite âme,  A fibrous layer 5 and porous thermal insulation, said layer being overmolded by said core,
• une feuille 6 métallique - notamment en aluminium - de réflexion de la chaleur,  A foil 6 - in particular aluminum - for reflection of heat,
ledit écran étant réalisé en au moins deux parties 7a, 7b disposées en juxtaposition côte à côte de manière à assurer une protection thermique continue de deux zone contigues de ladite face. Selon les réalisations représentées, l'écran 4 s'étend sur la tranche 1 1 de l'âme 2. said screen being made of at least two parts 7a, 7b disposed side by side in juxtaposition so as to provide continuous thermal protection of two contiguous areas of said face. According to the embodiments shown, the screen 4 extends on the slice 1 1 of the core 2.
Selon la réalisation représentée en figure 1 , les deux parties 7a,7b sont distinctes et disposées côte à côte en chevauchement. According to the embodiment shown in Figure 1, the two parts 7a, 7b are separate and arranged side by side in overlap.
Selon la réalisation représentée en figure 2, les deux parties 7a,7b sont monobloc, lesdites parties étant associées l'une à l'autre par l'intermédiaire d'une zone rectiligne amincie 8 où la couche fibreuse 5 est surcomprimée, de manière à former une charnière souple permettant un débattement angulaire desdites parties l'une par rapport à l'autre avant leur surmoulage par l'âme 2. According to the embodiment shown in FIG. 2, the two parts 7a, 7b are in one piece, said parts being associated with each other via a thinned linear zone 8 where the fibrous layer 5 is supercharged, so as to forming a flexible hinge allowing an angular displacement of said parts relative to each other before overmolding by the core 2.
Selon une réalisation, la mousse de l'âme 2 présente une résistance au passage de l'air comprise entre 1000 et 1500 N.s.nrr3. Selon une réalisation, la mousse de l'âme 2 présente une densité comprise entre 0,22 et 0,28, et notamment entre 0,23 et 0,27. According to one embodiment, the foam of the core 2 has a resistance to the passage of air of between 1000 and 1500 Nsnrr 3 . According to one embodiment, the foam of the core 2 has a density of between 0.22 and 0.28, and in particular between 0.23 and 0.27.
Une mousse dotée de telles caractéristiques de résistance au passage de l'air et de densité est usuellement utilisée pour réaliser des panneaux de protection acoustique destinés à se protéger d'une source chaude et sonore. Selon une réalisation, les fibres de la couche fibreuse 5 sont des fibres minérales - notamment de verre, de silice ou de roche, le type de fibres étant choisi selon les caractéristiques de conductivité thermique attendues pour ladite couche. Selon une réalisation, la couche fibreuse 5 présente une conductivité thermique comprise entre 0,055 et 0,061 W.nrr1.K-1 à 200°C, et notamment entre 0,057 et 0,059 W.m-1.K-1. A foam with such characteristics of resistance to the passage of air and density is usually used to make acoustic protection panels for protection from a hot and sound source. According to one embodiment, the fibers of the fibrous layer 5 are mineral fibers - in particular glass, silica or rock, the type of fibers being chosen according to the expected thermal conductivity characteristics for said layer. According to one embodiment, the fibrous layer 5 has a thermal conductivity of between 0.055 and 0.061 Wr -1 .K- 1 at 200 ° C, and especially between 0.057 and 0.059 Wm- 1 .K- 1 .
Selon une réalisation, la couche fibreuse 5 présente une résistance au passage de l'air inférieure à 4000 N.s.nrr3. According to one embodiment, the fibrous layer 5 has a resistance to the passage of air below 4000 Nsnrr 3 .
Selon une réalisation, la couche fibreuse 5 présente une épaisseur comprise entre 3 et 6 mm. Selon une réalisation, la couche fibreuse 5 présente une masse surfacique comprise entre 600 et 1000 g/m2. In one embodiment, the fibrous layer 5 has a thickness of between 3 and 6 mm. According to one embodiment, the fibrous layer 5 has a density of between 600 and 1000 g / m 2 .
Selon une réalisation, les fibres de la couche fibreuse 5 sont liées entre elles par une résine, notamment thermodurcissable, par exemple phénolique. According to one embodiment, the fibers of the fibrous layer 5 are bonded together by a resin, in particular thermosetting resin, for example phenolic resin.
Dans ce cas, la liaison entre la feuille 6 et la couche fibreuse 5 peut être assurée par la résine. In this case, the bond between the sheet 6 and the fibrous layer 5 can be provided by the resin.
Selon une autre réalisation, les fibres de la couche fibreuse 5 sont liées entre elles par aiguilletage sans ajout de résine, ce qui facilite le recyclage du panneau 1 en fin de vie. In another embodiment, the fibers of the fibrous layer 5 are bonded together by needling without adding resin, which facilitates the recycling of the panel 1 at the end of life.
Selon les réalisations représentées, la couche fibreuse 5 est revêtue d'une couche de non-tissé 9 intercalaire s'interposant entre ladite couche fibreuse et l'âme 2. According to the embodiments shown, the fibrous layer 5 is coated with a layer of nonwoven interlayer 9 interposed between said fibrous layer and the core 2.
Une telle couche de non-tissé 9 permet notamment de faciliter le démoulage de l'écran 4 suite à sa fabrication par thermocompression. De façon non représenté, la feuille 6 métallique peut être pourvue d'une pluralité de micro-perforations, la densité surfacique de micro perforations étant notamment comprise entre 400 000 et 600 000 micro-perforations par m2. Such a layer of nonwoven 9 makes it possible in particular to facilitate demolding of the screen 4 following its manufacture by thermocompression. In a manner not shown, the metal sheet 6 may be provided with a plurality of micro-perforations, the surface density of micro perforations being in particular between 400,000 and 600,000 micro-perforations per m 2 .
La présence de telles micro-perforations permet aux ondes sonores de traverser la feuille 6 métallique pour être absorbées par la couche d'isolation 5 et par l'âme 2. Selon une réalisation, la feuille 6 métallique présente une épaisseur comprise entre 50 et 150 microns, et notamment entre 70 et 100 microns, une épaisseur aussi faible contribuant à l'allégement de l'écran 4. The presence of such micro-perforations allows the sound waves to pass through the metal sheet 6 to be absorbed by the insulating layer 5 and the core 2. According to one embodiment, the metal sheet 6 has a thickness of between 50 and 150 microns, and especially between 70 and 100 microns, a thickness as small contributing to the lightening of the screen 4.
De façon non représentée, la feuille 6 peut être gaufrée de manière à pouvoir être étirée. In a manner not shown, the sheet 6 can be embossed so that it can be stretched.
Selon les réalisations représentées, l'âme 2 présente une face opposée 10 à la face 3 destinée à être exposée à la source, ladite face opposée étant dépourvue de revêtement étanche, de manière à optimiser l'absorption acoustique attendue. According to the embodiments shown, the core 2 has a face opposite to the face 3 intended to be exposed to the source, said opposite face being devoid of waterproof coating, so as to optimize the expected acoustic absorption.

Claims

REVENDICATIONS
1 . Procédé de réalisation d'un panneau (1 ) de protection acoustique destiné à être monté en regard d'une source sonore et chaude de véhicule, ledit procédé comprenant les étapes suivantes : 1. A method of producing an acoustic protection panel (1) intended to be mounted facing a sound source and a vehicle hot source, said method comprising the following steps:
• réaliser par thermocompression dans un premier moule (20) un écran (4) comprenant deux parties (7a, 7b), lesdites parties étant disposées l'une par rapport à l'autre selon une première configuration permettant leur démoulage, lesdites parties comprenant chacune une couche fibreuse (5) et poreuse d'isolation thermique et une feuille (6) métallique - notamment en aluminium - de réflexion de la chaleur,  By thermocompression in a first mold (20), a screen (4) comprising two parts (7a, 7b), said parts being arranged relative to each other in a first configuration allowing their demoulding, said parts comprising each a fibrous layer (5) and porous thermal insulation and a sheet (6) metal - including aluminum - of heat reflection,
• disposer en juxtaposition côte à côte lesdites parties dans un deuxième moule dont la cavité de moulage correspond à la géométrie dudit panneau à obtenir, de sorte que lesdites parties puissent, par placage contre la paroi de ladite cavité, adopter une deuxième configuration correspondant à ladite géométrie, ladite couche fibreuse étant tournée vers l'intérieur de ladite cavité,  Placing side by side said portions in a second mold whose molding cavity corresponds to the geometry of said panel to be obtained, so that said parts can, by plating against the wall of said cavity, adopt a second configuration corresponding to said geometry, said fibrous layer being turned towards the inside of said cavity,
• injecter dans ladite cavité un mélange précurseur de mousse, de manière à réaliser une âme (2) surmoulant ladite couche fibreuse,  Injecting into said cavity a precursor mixture of foam, so as to produce a core (2) overmolding said fibrous layer,
· après expansion de la mousse, démouler ledit panneau obtenu.  After expansion of the foam, demolding said panel obtained.
2. Procédé selon la revendication 1 , caractérisé en ce que les deux parties (7a, 7b) sont distinctes et disposées côte à côte en chevauchement. 2. Method according to claim 1, characterized in that the two parts (7a, 7b) are separate and arranged side by side in overlap.
3. Procédé selon la revendication 1 , caractérisé en ce que les deux parties (7a, 7b) sont monobloc, la thermocompression réalisant une zone rectiligne amincie (8) où la couche fibreuse (5) est surcomprimée, de manière à former une charnière souple permettant un débattement angulaire desdites parties l'une par rapport à l'autre pour passer de la première à la deuxième configuration de l'écran (4). 3. Method according to claim 1, characterized in that the two parts (7a, 7b) are monobloc, thermocompression realizing a thinned straight zone (8) where the fibrous layer (5) is supercharged, so as to form a flexible hinge allowing an angular displacement of said parts relative to each other to move from the first to the second configuration of the screen (4).
4. Panneau (1 ) réalisé par un procédé selon l'une quelconque des revendications 1 à 3, ledit panneau comprenant, disposés l'un sur l'autre : • une âme (2) moulée à base de mousse de polyuréthanne poreuse, de manière à permettre une absorption acoustique du bruit issu de ladite source, ladite âme présentant une face (3) destinée à être tournée vers ladite source, 4. Panel (1) made by a method according to any one of claims 1 to 3, said panel comprising, arranged one on the other: A core (2) molded based on porous polyurethane foam, so as to allow an acoustic absorption of the noise coming from said source, said core having a face (3) intended to be turned towards said source,
« un écran (4) de protection thermique thermo-comprimé recouvrant au moins en partie ladite face,  "A thermo-compressed thermal protection screen (4) covering at least in part said face,
ledit écran comprenant : said screen comprising:
• une couche fibreuse (5) et poreuse d'isolation thermique, ladite couche étant surmoulée par ladite âme,  A fibrous layer (5) and porous thermal insulation, said layer being overmolded by said core,
· une feuille (6) métallique - notamment en aluminium - de réflexion de la chaleur,  · A sheet (6) of metal - in particular aluminum - of reflection of the heat,
ledit panneau étant caractérisé en ce que ledit écran est réalisé en au moins deux parties (7a, 7b) disposées en juxtaposition côte à côte de manière à assurer une protection thermique continue de deux zone contigues de ladite face. said panel being characterized in that said screen is made of at least two parts (7a, 7b) arranged side by side in juxtaposition so as to provide continuous thermal protection of two contiguous areas of said face.
5. Panneau selon la revendication 4, caractérisé en ce que l'écran (4) s'étend sur la tranche (1 1 ) de l'âme (2). 5. Panel according to claim 4, characterized in that the screen (4) extends on the wafer (1 1) of the core (2).
6. Panneau selon l'une des revendications 4 ou 5, quand elle se rattache à la revendication 2, caractérisé en ce que les deux parties (7a, 7b) sont distinctes et disposées côte à côte en chevauchement. 6. Panel according to one of claims 4 or 5, when it is attached to claim 2, characterized in that the two parts (7a, 7b) are separate and arranged side by side overlapping.
7. Panneau selon l'une des revendications 4 ou 5, quand elle se rattache à la revendication 3, caractérisé en ce que les deux parties (7a, 7b) sont monobloc, lesdites parties étant associées l'une à l'autre par l'intermédiaire d'une zone rectiligne amincie (8) où la couche fibreuse (5) est surcomprimée, de manière à former une charnière souple permettant un débattement angulaire desdites parties l'une par rapport à l'autre avant leur surmoulage par l'âme (2). 7. Panel according to one of claims 4 or 5, when it is related to claim 3, characterized in that the two parts (7a, 7b) are monobloc, said parts being associated with each other by the intermediate a thinned rectilinear zone (8) where the fibrous layer (5) is supercharged, so as to form a flexible hinge allowing an angular displacement of said parts relative to each other before overmolding by the core (2).
8. Panneau selon l'une quelconque des revendications 4 à 7, caractérisé en ce que la mousse de l'âme (2) présente une résistance au passage de l'air comprise entre 1000 et 1500 N.s.nrr3. 8. Panel according to any one of claims 4 to 7, characterized in that the foam of the core (2) has a resistance to the passage of air between 1000 and 1500 Nsnrr 3 .
9. Panneau selon l'une quelconque des revendications 4 à 8, caractérisé en ce que les fibres de la couche fibreuse (5) sont des fibres minérales - notamment de verre, de silice ou de roche. 9. Panel according to any one of claims 4 to 8, characterized in that the fibers of the fibrous layer (5) are mineral fibers - especially glass, silica or rock.
10. Panneau selon l'une quelconque des revendications 4 à 9, caractérisé en ce que la couche fibreuse (5) est revêtue d'une couche de non-tissé (9) intercalaire s'interposant entre ladite couche fibreuse et l'âme (2). 10. Panel according to any one of claims 4 to 9, characterized in that the fibrous layer (5) is coated with a layer of nonwoven (9) intermediate interposed between said fibrous layer and the core ( 2).
EP16729023.8A 2015-05-13 2016-05-12 Method for producing an acoustic protection panel intended to be fitted facing a noisy and hot source of a vehicle Withdrawn EP3294591A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1554307A FR3036076B1 (en) 2015-05-13 2015-05-13 METHOD FOR PRODUCING AN ACOUSTIC PROTECTION PANEL TO BE MOUNTED IN RELATION TO A SOUND SOURCE AND HOT VEHICLE
PCT/FR2016/051130 WO2016181084A1 (en) 2015-05-13 2016-05-12 Method for producing an acoustic protection panel intended to be fitted facing a noisy and hot source of a vehicle

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EP (1) EP3294591A1 (en)
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WO (1) WO2016181084A1 (en)

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FR3069480B1 (en) * 2017-07-28 2020-03-20 Treves Products, Services & Innovation ACOUSTIC PROTECTION HOOD FOR MOTOR VEHICLE ENGINE
FR3073469B1 (en) * 2017-11-15 2019-12-13 Treves Products, Services & Innovation ACOUSTIC PROTECTION SCREEN FOR MOUNTING ABOVE A MOTOR VEHICLE ENGINE

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WO2016181084A1 (en) 2016-11-17
CN107848471A (en) 2018-03-27
FR3036076B1 (en) 2017-06-23
CN107848471B (en) 2021-04-30
FR3036076A1 (en) 2016-11-18

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