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)

Applications Claiming Priority (2)

Publications (1)

Family

ID=54014963

Family Applications (1)

Country Status (5)

Families Citing this family (4)

Family Cites Families (12)

• 2015
  • 2015-05-13 FR FR1554307A patent/FR3036076B1/fr not_active Expired - Fee Related
• 2016
  • 2016-05-12 EP EP16729023.8A patent/EP3294591A1/de not_active Withdrawn
  • 2016-05-12 WO PCT/FR2016/051130 patent/WO2016181084A1/fr unknown
  • 2016-05-12 CN CN201680034462.2A patent/CN107848471B/zh not_active Expired - Fee Related
  • 2016-05-12 US US15/573,567 patent/US20180354429A1/en not_active Abandoned

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