FR3130719A1 - Motor vehicle luggage compartment side trim assembly - Google Patents

Motor vehicle luggage compartment side trim assembly Download PDF

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Publication number
FR3130719A1
FR3130719A1 FR2114025A FR2114025A FR3130719A1 FR 3130719 A1 FR3130719 A1 FR 3130719A1 FR 2114025 A FR2114025 A FR 2114025A FR 2114025 A FR2114025 A FR 2114025A FR 3130719 A1 FR3130719 A1 FR 3130719A1
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France
Prior art keywords
fibers
layer
absorption
reinforcing
assembly according
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Granted
Application number
FR2114025A
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French (fr)
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FR3130719B1 (en
Inventor
Arnaud Duval
Mickael GORET
Guillaume Crignon
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Treves Products Services and Innovation SAS
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Treves Products Services and Innovation SAS
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Priority to FR2114025A priority Critical patent/FR3130719B1/en
Publication of FR3130719A1 publication Critical patent/FR3130719A1/en
Application granted granted Critical
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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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/20—Making multilayered or multicoloured articles
    • B29C43/203—Making multilayered articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/1209—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements by impregnating a preformed part, e.g. a porous lining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/465—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating by melting a solid material, e.g. sheets, powders of fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/08—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • 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
    • B60R13/0861—Insulating elements, e.g. for sound insulation for covering undersurfaces of vehicles, e.g. wheel houses
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/14—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B2262/0276—Polyester fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B32B2262/0284—Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT]
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
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    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/12—Conjugate fibres, e.g. core/sheath or side-by-side
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    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Multimedia (AREA)
  • Laminated Bodies (AREA)

Abstract

L’invention concerne un ensemble de garnissage latéral de compartiment à bagages de véhicule automobile, ledit ensemble comprenant une tôle (2), du côté extérieur, un pare-boue (3), et, du côté intérieur, un panneau (5) comprenant une couche d’aspect (6) intérieur à base de matériau fibreux, une couche de renfort (7) comprenant des fibres de renfort et des fibres fines d’absorption acoustique liées entre elles par des fibres de liaison fusibles, la masse surfacique de ladite couche étant comprise entre 400 et 2000 g/m², ladite couche présentant un module de Young en compression supérieur à 1 MPa, un film (8) d’étanchéité de masse surfacique inférieure à 150 g/m² collé sur ladite couche de renfort, une couche d’absorption (9) comprenant des fibres de base liées entre elles par des fibres de liaison fusibles, lesdites fibres de base présentant un titre inférieur à 2 dtex, ladite couche présentant une masse volumique inférieure à 35 kg/m3 et une épaisseur minimale de 25 mm sur au moins 90% de sa surface. Figure 1The invention relates to a motor vehicle luggage compartment side trim assembly, said assembly comprising a sheet (2), on the outside, a mudguard (3), and, on the inside, a panel (5) comprising an interior appearance layer (6) based on fibrous material, a reinforcing layer (7) comprising reinforcing fibers and fine acoustic absorption fibers bonded together by fusible bonding fibers, the surface mass of said layer being between 400 and 2000 g/m², said layer having a Young's modulus in compression greater than 1 MPa, a sealing film (8) with a surface mass of less than 150 g/m² bonded to said reinforcing layer, a absorption layer (9) comprising base fibers bonded together by fusible bonding fibers, said base fibers having a titer of less than 2 dtex, said layer having a density of less than 35 kg/m3 and a minimum thickness 25 mm over at least 90% of its surface. Figure 1

Description

Ensemble de garnissage latéral de compartiment à bagages de véhicule automobileMotor vehicle luggage compartment side trim assembly

L’invention concerne un ensemble de garnissage latéral de compartiment à bagages de véhicule automobile.The invention relates to a motor vehicle luggage compartment side trim assembly.

Il est connu de réaliser un ensemble de garnissage latéral de compartiment à bagages de véhicule automobile, ledit ensemble comprenant une tôle solidaire de la caisse du véhicule, ledit ensemble comprenant en outre :It is known to produce a side trim assembly for a motor vehicle luggage compartment, said assembly comprising a sheet integral with the body of the vehicle, said assembly further comprising:

  • du côté extérieur, un pare-boue en matériau thermoplastique moulé par injection, ledit pare-boue étant disposé généralement à distance de ladite tôle de manière à créer une lame d’air selon au moins 90% de sa surface,on the outer side, a mud flap made of injection-moulded thermoplastic material, said mud flap being placed generally at a distance from said sheet metal so as to create an air gap along at least 90% of its surface,
  • du côté intérieur, un panneau de recouvrement de ladite tôle, ledit panneau comprenant successivement, en se dirigeant vers ladite tôle :
    • une couche d’aspect intérieur à base de de matériau fibreux,
    • une couche de renfort mécanique à base d’élastomère thermoplastique – par exemple en polyoléfine extrudée chargée avec une charge minérale, par exemple de la baryte -, la masse surfacique de ladite couche étant comprise entre 1000 et 3000 g/m²,
    • une couche d’absorption à base de matériau fibreux comprenant des fibres de base – par exemple en coton – liées entre elles par des fibres de liaison fusibles, ladite couche présentant une masse volumique supérieure à 50 kg/m3et une épaisseur comprise entre 10 et 15 mm selon au moins 90% de sa surface.
    on the inside, a panel covering said sheet, said panel successively comprising, moving towards said sheet:
    • an interior appearance layer based on fibrous material,
    • a mechanical reinforcement layer based on thermoplastic elastomer – for example extruded polyolefin filled with a mineral filler, for example baryta -, the surface mass of said layer being between 1000 and 3000 g/m²,
    • an absorption layer based on fibrous material comprising base fibers - for example cotton - bound together by fusible bonding fibers, said layer having a density greater than 50 kg/m 3 and a thickness of between 10 and 15 mm along at least 90% of its surface.

Un tel ensemble présente une masse importante et des performances d’isolation et d’absorption acoustique non optimisées, comme on le verra plus loin.Such an assembly has a large mass and non-optimized insulation and sound absorption performance, as will be seen later.

Par ailleurs, le panneau présente une faible rigidité en flexion ne permettant pas d’assurer une bonne qualité perçue par l’utilisateur, par exemple en présence de bagages pouvant entraîner une déformation dudit panneau.Furthermore, the panel has a low bending rigidity which does not ensure good quality perceived by the user, for example in the presence of luggage which could cause deformation of said panel.

L’invention a pour but de pallier ces inconvénients.The object of the invention is to overcome these drawbacks.

A cet effet, et selon un premier aspect, l’invention propose un ensemble de garnissage latéral de compartiment à bagages de véhicule automobile, ledit ensemble comprenant une tôle solidaire de la caisse du véhicule, ledit ensemble comprenant en outre :To this end, and according to a first aspect, the invention proposes a motor vehicle luggage compartment side trim assembly, said assembly comprising a sheet integral with the body of the vehicle, said assembly further comprising:

  • du côté extérieur, un pare-boue à base d’une couche de matériau fibreux thermo-compressée comprenant des fibres de base liées entre elles par des fibres de liaison fusibles, ledit pare-boue étant disposé généralement à distance de ladite tôle de manière à créer une lame d’air selon au moins 90% de sa surface,on the outer side, a mudguard based on a layer of thermo-compressed fibrous material comprising base fibers bonded together by fusible link fibers, said mudguard being disposed generally at a distance from said sheet so as to create an air gap along at least 90% of its surface,
  • du côté intérieur, un panneau de recouvrement de ladite tôle, ledit panneau comprenant successivement, en se dirigeant vers ladite tôle :
    • une couche d’aspect intérieur à base de matériau fibreux,
    • une couche de renfort mécanique à base de matériau fibreux, ladite couche comprenant des fibres de renfort et des fibres fines d’absorption acoustique liées entre elles par des fibres de liaison fusibles, la masse surfacique de ladite couche étant comprise entre 400 et 2000 g/m², ladite couche présentant un module de Young en compression supérieur à 1 MPa,
    • un film d’étanchéité de masse surfacique inférieure à 150 g/m² collé sur ladite couche de renfort,
    • une couche d’absorption à base de matériau fibreux comprenant des fibres de base liées entre elles par des fibres de liaison fusibles, lesdites fibres de base présentant un titre inférieur à 2 dtex, ladite couche présentant une masse volumique inférieure à 35 kg/m3et une épaisseur minimale de 25 mm sur au moins 90% de sa surface.
    on the inside, a panel covering said sheet, said panel successively comprising, moving towards said sheet:
    • an interior appearance layer based on fibrous material,
    • a mechanical reinforcement layer based on fibrous material, said layer comprising reinforcing fibers and fine acoustic absorption fibers bonded together by fusible bonding fibers, the surface mass of said layer being between 400 and 2000 g/ m², said layer having a Young's modulus in compression greater than 1 MPa,
    • a sealing film with a surface weight of less than 150 g/m² bonded to said reinforcing layer,
    • an absorption layer based on fibrous material comprising base fibers linked together by fusible bonding fibers, said base fibers having a titer of less than 2 dtex, said layer having a density of less than 35 kg/m 3 and a minimum thickness of 25 mm over at least 90% of its surface.

Quand il est fait mention de fibres de liaison fusibles, on entend que le caractère fusible peut n’être mis en œuvre que sur une partie des fibres, et notamment leur gaine quand il s’agit de fibre bi-composant telles qu’explicitées plus loin.When mention is made of fusible link fibers, it is meant that the fusible character can only be implemented on part of the fibers, and in particular their sheath when it comes to bi-component fiber as explained more far.

La fusion, partielle ou complète, des fibres de liaison permet d’assurer la liaison attendue.The fusion, partial or complete, of the connecting fibers makes it possible to ensure the expected connection.

Avec l’agencement proposé, la couche d’absorption présente une épaisseur plus importante que ce qui était connu de l’art antérieur, de manière à occuper plus substantiellement l’espace vacant s’étendant entre la tôle et le panneau de recouvrement intérieur.With the proposed arrangement, the absorption layer has a greater thickness than what was known from the prior art, so as to occupy more substantially the vacant space extending between the sheet and the interior covering panel.

Il en résulte une amélioration de la protection acoustique globale, aussi bien en isolation qu’en absorption, comme on l’explicitera plus loin.This results in an improvement in overall acoustic protection, both in terms of insulation and absorption, as will be explained later.

On observe en outre un allègement de l’ensemble et une amélioration de la rigidité du panneau, comme on le décrira également plus loin.There is also a lightening of the assembly and an improvement in the rigidity of the panel, as will also be described later.

Enfin, la rigidité en flexion du panneau est améliorée.Finally, the bending rigidity of the panel is improved.

D’autres particularités et avantages de l’invention apparaîtront dans la description qui suit, faite en référence aux figures jointes, dans lesquelles :Other particularities and advantages of the invention will appear in the following description, made with reference to the attached figures, in which:

est une vue schématique partielle en coupe d’un ensemble selon l’invention, is a partial schematic sectional view of an assembly according to the invention,

est une vue en coupe schématique d’une fibre de liaison bi-composant, is a schematic sectional view of a bi-component binder fiber,

et And

sont des courbes représentant la performance en absorption acoustique (coefficient alpha en ordonnée) en fonction de la fréquence 1/3 octave en Hertz, en champ diffus, pour une référence selon l’art antérieur (courbes 1) et pour une réalisation selon l’invention (courbes 2) du côté du panneau ( ) et du côté du pare boue ( ), sachant que (les masses surfaciques étant indiquées entre parenthèses) : are curves representing the sound absorption performance (alpha coefficient on the ordinate) as a function of the 1/3 octave frequency in Hertz, in a diffuse field, for a reference according to the prior art (curves 1) and for an embodiment according to invention (curves 2) on the side of the panel ( ) and on the mudguard side ( ), knowing that (the surface masses being indicated in parentheses):

  • l’ensemble de référence selon l’art antérieur présente la composition suivante : couche d’aspect fibreuse (300 g/m²) ; couche de renfort à base de polypropylène extrudé (1630 g/m²) ; couche d’absorption à base de coton (900 g/m²) ; tôle (6250 g/m²) ; pare-boue en polypropylène moulé (2000 g/m²),the reference assembly according to the prior art has the following composition: layer with a fibrous appearance (300 g/m²); reinforcing layer based on extruded polypropylene (1630 g/m²); cotton-based absorption layer (900 g/m²); sheet metal (6250 gsm); mudguard in molded polypropylene (2000 g/m²),
  • l’ensemble selon l’invention présente la composition suivante : couche d’aspect fibreuse (300 g/m²) ; couche de renfort fibreuse (1000 g/m²) ; film (100 g/m²) ; couche d’absorption fibreuse (450 g/m²) ; tôle (6250 g/m²) ; pare-boue fibreux (1000 g/m²),the assembly according to the invention has the following composition: layer of fibrous appearance (300 g/m²); fibrous reinforcement layer (1000 g/m²); film (100gsm); fibrous absorption layer (450 g/m²); sheet metal (6250 gsm); fibrous mudguard (1000 g/m²),

représente la performance en isolation acoustique (perte de transmission en fonction de la fréquence) d’un ensemble de référence selon l’art antérieur (courbe 1) et selon une réalisation selon l’invention (courbe 2), les compositions de référence et selon l’invention étant celles exposées en légende des figures 3. represents the sound insulation performance (transmission loss as a function of frequency) of a reference assembly according to the prior art (curve 1) and according to an embodiment according to the invention (curve 2), the reference compositions and according to the invention being those set out in the legend of figures 3.

En référence aux figures, on décrit un ensemble de garnissage latéral de compartiment à bagages de véhicule automobile, ledit ensemble comprenant une tôle 2 solidaire de la caisse du véhicule, ledit ensemble comprenant en outre :With reference to the figures, a motor vehicle luggage compartment side trim assembly is described, said assembly comprising a sheet 2 secured to the body of the vehicle, said assembly further comprising:

  • du côté extérieur, un pare-boue 3 à base d’une couche de matériau fibreux thermo-compressée comprenant des fibres de base liées entre elles par des fibres de liaison fusibles, ledit pare-boue étant disposé généralement à distance de ladite tôle de manière à créer une lame d’air 11 selon au moins 90% de sa surface,on the outside, a mudguard 3 based on a layer of thermo-compressed fibrous material comprising base fibers bonded together by fusible bonding fibers, said mudguard being disposed generally at a distance from said sheet in such a way to create an air gap 11 along at least 90% of its surface,
  • du côté intérieur, un panneau de recouvrement 5 de ladite tôle, ledit panneau comprenant successivement, en se dirigeant vers ladite tôle :
    • une couche d’aspect intérieur 6 à base de de matériau fibreux,
    • une couche de renfort mécanique 7 à base de matériau fibreux, ladite couche comprenant des fibres de renfort et des fibres fines d’absorption acoustique liées entre elles par des fibres de liaison fusibles, la masse surfacique de ladite couche étant comprise entre 400 et 2000 g/m², ladite couche présentant un module de Young en compression supérieur à 1 MPa,
    • un film 8 d’étanchéité de masse surfacique inférieure à 150 g/m² collé sur ladite couche de renfort,
    • une couche d’absorption 9 à base de matériau fibreux comprenant des fibres de base liées entre elles par des fibres de liaison fusibles, lesdites fibres de base présentant un titre inférieur à 2 dtex, ladite couche présentant une masse volumique inférieure à 35 kg/m3et une épaisseur minimale de 25 mm sur au moins 90% de sa surface.
    on the inside, a cover panel 5 of said sheet, said panel successively comprising, moving towards said sheet:
    • a layer of interior appearance 6 based on fibrous material,
    • a mechanical reinforcement layer 7 based on fibrous material, said layer comprising reinforcing fibers and fine acoustic absorption fibers bonded together by fusible bonding fibers, the surface mass of said layer being between 400 and 2000 g /m², said layer having a Young's modulus in compression greater than 1 MPa,
    • a sealing film 8 with a surface weight of less than 150 g/m² bonded to said reinforcing layer,
    • an absorption layer 9 based on fibrous material comprising base fibers bonded together by fusible bonding fibers, said base fibers having a titer of less than 2 dtex, said layer having a density of less than 35 kg/m 3 and a minimum thickness of 25 mm over at least 90% of its surface.

Selon une réalisation, la couche de renfort 7 présente la composition suivante :According to one embodiment, the reinforcing layer 7 has the following composition:

  • les fibres de renfort sont présentes à hauteur de 25 à 40% en poids de ladite couche,the reinforcing fibers are present at 25 to 40% by weight of said layer,
  • les fibres d’absorption sont présentes à hauteur de 15 à 35% en poids de ladite couche,the absorption fibers are present at 15 to 35% by weight of said layer,
  • les fibres de liaison sont présentes à hauteur de 35 à 50% en poids de ladite couche.the binding fibers are present at 35 to 50% by weight of said layer.

Selon diverses réalisations, les fibres de renfort sont :According to various embodiments, the reinforcing fibers are:

  • des fibres de polyéthylène téréphtalate (PET) de titre compris entre 6 et 17 dtex, ledit titre étant notamment de 6,7 dtex,polyethylene terephthalate (PET) fibers with a titer of between 6 and 17 dtex, said titer being in particular 6.7 dtex,
  • et/ou des fibres de verre de diamètre compris entre 20 et 40 microns,and/or glass fibers with a diameter of between 20 and 40 microns,
  • et/ou des fibres naturelles prises d’un seul type ou mélangées entre différentes types – par exemple de lin, chanvre ou kénaf –, de telles fibres présentant une section variable, notamment de 30+/-20 microns.and/or natural fibers taken from a single type or mixed between different types – for example flax, hemp or kenaf –, such fibers having a variable section, in particular of 30+/-20 microns.

Selon une réalisation, les fibres d’absorption sont à base de polyéthylène téréphtalate (PET) de titre compris entre 0,1 et 3,3 dtex, et notamment de titre sensiblement égal à 1,7 dtex.According to one embodiment, the absorption fibers are based on polyethylene terephthalate (PET) with a titer of between 0.1 and 3.3 dtex, and in particular with a titer substantially equal to 1.7 dtex.

Selon un premier exemple, les fibres constitutives de la couche de renfort 7 se répartissent selon les pourcentages en poids suivants :According to a first example, the constituent fibers of the reinforcing layer 7 are distributed according to the following percentages by weight:

  • entre 15% et 25% de fibres d’absorption à base de polyéthylène téréphtalate (PET) et de titre compris entre 0,1 et 3,3 dtex,between 15% and 25% of absorption fibers based on polyethylene terephthalate (PET) and with a title of between 0.1 and 3.3 dtex,
  • entre 30% et 40% de fibres de renfort en verre, notamment de diamètre compris entre 20 et 40 microns,between 30% and 40% glass reinforcing fibers, in particular with a diameter of between 20 and 40 microns,
  • entre 40% et 50% de fibres de liaison en polypropylène assurant une liaison entre les fibres de ladite couche suite à leur fusion.between 40% and 50% of polypropylene bonding fibers ensuring a bond between the fibers of said layer following their fusion.

Selon un deuxième exemple, les fibres constitutives de la couche de renfort 7 se répartissent selon les pourcentages en poids suivants :According to a second example, the constituent fibers of the reinforcing layer 7 are distributed according to the following percentages by weight:

  • entre 25% et 35% de fibres d’absorption à base de polyéthylène téréphtalate (PET) et de titre compris entre 0,1 et 3,3 dtex,between 25% and 35% of absorption fibers based on polyethylene terephthalate (PET) and with a title of between 0.1 and 3.3 dtex,
  • entre 25% et 35% de fibres de renfort à base de polyéthylène téréphtalate (PET) et de titre compris entre 6 et 7 dtex,between 25% and 35% of reinforcement fibers based on polyethylene terephthalate (PET) and with a count of between 6 and 7 dtex,
  • entre 35% et 45% de fibres de liaison, notamment de polypropylène ou bi-composant 10 (décrites plus loin), assurant une liaison entre les fibres de ladite couche suite à leur fusion au moins partielle.between 35% and 45% of connecting fibers, in particular of polypropylene or two-component 10 (described later), ensuring a connection between the fibers of said layer following their at least partial fusion.

Selon un troisième exemple, les fibres constitutives de la couche de renfort se répartissent selon les pourcentages en poids suivants :According to a third example, the constituent fibers of the reinforcing layer are distributed according to the following percentages by weight:

  • entre 15% et 25% de fibres d’absorption à base de polyéthylène téréphtalate (PET) et de titre compris entre 0,1 et 3,3 dtex,between 15% and 25% of absorption fibers based on polyethylene terephthalate (PET) and with a title of between 0.1 and 3.3 dtex,
  • entre 30% et 40% de fibres de renfort naturelles,between 30% and 40% natural reinforcing fibers,
  • entre 40% et 50% de fibres de liaison en polypropylène assurant une liaison entre les fibres de ladite couche suite à leur fusion.between 40% and 50% of polypropylene bonding fibers ensuring a bond between the fibers of said layer following their fusion.

Selon une réalisation, le film 8 d’étanchéité est à base de matériau thermoplastique – par exemple de polyester ou de polyamide -, sachant que ledit film peut être un multicouches de différents matériaux, présentant notamment au moins une sous-couche externe de collage, par exemple en polyéthylène.According to one embodiment, the sealing film 8 is based on thermoplastic material - for example polyester or polyamide -, knowing that said film can be a multilayer of different materials, having in particular at least one external bonding sub-layer, for example polyethylene.

Selon une réalisation, les fibres de base de la couche d’absorption 9 présentent un titre inférieur à 2 dtex, et notamment égal à 1,7 dtex.According to one embodiment, the base fibers of the absorption layer 9 have a titer of less than 2 dtex, and in particular equal to 1.7 dtex.

Selon une réalisation, les fibres de base de la couche d’absorption 9 sont à base de polyester – et notamment de polyéthylène téréphtalate (PET) – et/ou de polypropylène.According to one embodiment, the base fibers of the absorption layer 9 are based on polyester – and in particular polyethylene terephthalate (PET) – and/or polypropylene.

Selon une réalisation, la couche d’absorption 9 comprend entre 25 et 30% en masse de fibres de liaison.According to one embodiment, the absorption layer 9 comprises between 25 and 30% by mass of connecting fibers.

Selon diverses réalisations, la couche d’absorption 9 est fixée au film 8 par collage ou encore au moyen de bouterolles.According to various embodiments, the absorption layer 9 is fixed to the film 8 by gluing or even by means of rivets.

Selon une réalisation, la couche d’absorption 9 présente, selon la norme ISO 3386-1 (01.06.1986), une caractéristique de contrainte en compression CC75inférieure à 20 kPa.According to one embodiment, the absorption layer 9 has, according to standard ISO 3386-1 (01.06.1986), a compressive stress characteristic CC 75 of less than 20 kPa.

Une telle aptitude à la compression permet à la couche d’absorption 9 de se loger partout, y compris dans les zones où l’espace entre le panneau 1 et la tôle 2 est de faible épaisseur ; et, dans les réalisations de l’art antérieur, ladite couche doit être retirée localement dans de telles zones, ce qui diminue les performances de protection acoustique dudit panneau.Such a capacity for compression allows the absorption layer 9 to be lodged everywhere, including in the zones where the space between the panel 1 and the sheet 2 is thin; and, in the embodiments of the prior art, said layer must be removed locally in such areas, which reduces the acoustic protection performance of said panel.

En outre, dans les zones de non contact entre la tôle 2 et la couche d’absorption 9, ladite couche se déploie de façon maximale, ce qui permet de compenser la perte d’isolation liée à masse surfacique réduite de la couche de renfort 7 par rapport à ce qui était connu dans l’art antérieur.In addition, in the zones of non-contact between the sheet 2 and the absorption layer 9, said layer deploys to the maximum, which makes it possible to compensate for the loss of insulation linked to the reduced surface mass of the reinforcing layer 7 compared to what was known in the prior art.

Selon une réalisation, la tôle 2 présente une épaisseur comprise entre 0,6 et 1,2 mm.According to one embodiment, the sheet 2 has a thickness of between 0.6 and 1.2 mm.

Selon une réalisation, la lame d’air 11 présente une épaisseur comprise entre 10 et 40 mm.According to one embodiment, the air gap 11 has a thickness of between 10 and 40 mm.

Selon une réalisation, les fibres de base du pare-boue 3 sont à base de polyester, notamment de polyéthylène téréphtalate.According to one embodiment, the base fibers of the mudguard 3 are based on polyester, in particular polyethylene terephthalate.

Selon une réalisation, les fibres de base du pare-boue 3 présentent un titre compris entre 3,3 et 13 dtex.According to one embodiment, the base fibers of the mudguard 3 have a count of between 3.3 and 13 dtex.

Selon une réalisation, les fibres de liaison de la couche de renfort 7 et/ou de la couche d’absorption 9 et/ou du pare-boue 3 présentent un titre compris entre 2,2 et 6,7 dtex, et notamment égal à 4,4 dtex.According to one embodiment, the binding fibers of the reinforcement layer 7 and/or of the absorption layer 9 and/or of the mudguard 3 have a count of between 2.2 and 6.7 dtex, and in particular equal to 4.4 dtex.

Selon diverses réalisations, les fibres de liaison du pare-boue 3 et/ou de la couche de renfort 7 et/ou de la couche d’absorption 9 sont :According to various embodiments, the connecting fibers of the mudguard 3 and/or of the reinforcement layer 7 and/or of the absorption layer 9 are:

  • des fibres de polypropylène, notamment de titre compris entre 6 et 7 dtex, ledit titre étant notamment de 6,7 dtex,polypropylene fibers, in particular with a denier of between 6 and 7 dtex, said denier being in particular 6.7 dtex,
  • ou des fibres bi-composant 10 comprenant une âme 12 à haut point de fusion et une gaine 13 à point de fusion moindre, ladite gaine assurant la liaison entre les fibres consécutivement à sa fusion.or two-component fibers 10 comprising a core 12 with a high melting point and a sheath 13 with a lower melting point, said sheath providing the connection between the fibers following its fusion.

En particulier, les fibres bi-composant 10 comprennent une âme 12 en polyéthylène téréphtalate (PET), de point de fusion de l’ordre de 250°C, et la gaine 13 est en polyéthylène téréphtalate (PET) ayant subi une modification chimique de manière à présenter un point de fusion abaissé, par exemple de l’ordre de 180°C.In particular, the two-component fibers 10 comprise a core 12 of polyethylene terephthalate (PET), with a melting point of the order of 250° C., and the sheath 13 is made of polyethylene terephthalate (PET) having undergone a chemical modification of so as to have a lowered melting point, for example of the order of 180°C.

On commente à présent les courbes présentées en figures 3 et 4.We now comment on the curves presented in Figures 3 and 4.

Concernant l’absorption du côté du panneau 5 ( ), on observe que le remplacement de la couche de renfort à base de polyoléfine par une couche de renfort 7 à base de matériau fibreux, associée au film 8, permet d’augmenter de façon très notoire (entre 30 et 40%) l’absorption en hautes fréquences au-delà de 800 Hz.Regarding the absorption on the side of panel 5 ( ), it is observed that the replacement of the reinforcing layer based on polyolefin by a reinforcing layer 7 based on fibrous material, associated with the film 8, makes it possible to increase very noticeably (between 30 and 40%) the absorption at high frequencies above 800 Hz.

Concernant l’absorption du côté du pare-boue 3 ( ), on observe que le remplacement du pare-boue en matériau thermoplastique moulé par un pare-boue 3 à base d’une couche de matériau fibreux thermo-compressée permet d’augmenter de façon drastique l’absorption en moyennes et hautes fréquences au-delà de 500 Hz, ce qui était prévisible étant donné le caractère poreux du pare-boue 3 utilisé dans l’invention.Concerning the absorption on the side of the mudguard 3 ( ), it is observed that the replacement of the molded thermoplastic mudguard by a mudguard 3 based on a layer of thermo-compressed fibrous material makes it possible to drastically increase the absorption at medium and high frequencies above beyond 500 Hz, which was foreseeable given the porous character of the mudguard 3 used in the invention.

Comme observé sur la , la réduction de poids très importante apportée à la couche de renfort mécanique 7, qui aurait dû se traduire par une dégradation de l’isolation, ne conduit pas à une telle dégradation grâce à l’augmentation d’épaisseur de la couche d’absorption 9, dont la masse est en outre amoindrie par rapport à ce qui était connu de l’art antérieur, permettant de remplir davantage l’espace vacant entre le panneau 5 et la tôle 2 (principe de « double paroi »).As observed on the , the very significant reduction in weight brought to the mechanical reinforcement layer 7, which should have resulted in a degradation of the insulation, does not lead to such a degradation thanks to the increase in thickness of the absorption layer 9, the mass of which is also reduced compared to what was known from the prior art, making it possible to further fill the vacant space between the panel 5 and the sheet 2 (principle of “double wall”).

Par ailleurs, l’augmentation du module de Young en compression de la couche de renfort 7, associée au film 8, accentue encore les performances d’isolation de l’ensemble 1 en respectant un comportement en isolation de type « masse-ressort », et ceci sans résonance jusqu’à 10 kHz.Furthermore, the increase in the Young's modulus in compression of the reinforcing layer 7, associated with the film 8, further accentuates the insulation performance of the assembly 1 by respecting a behavior in insulation of the “mass-spring” type, and this without resonance up to 10 kHz.

On observe sur la , une amélioration de l’isolation de l’ensemble 1 à partir de 300 Hz.We observe on the , an improvement in the isolation of set 1 from 300 Hz.

Il est à noter que le pare-boue 3, rendu poreux, contribue également à l’amélioration de l’isolation.It should be noted that the mudguard 3, made porous, also contributes to the improvement of the insulation.

En effet, le remplacement d’un pare-boue étanche par un pare-boue 3 poreux permet une amélioration de l’isolation en moyenne fréquence (315-2000 Hz), ceci par suppression d’une antirésonance du système « double paroi » avant la « fréquence de respiration ».Indeed, the replacement of a waterproof mudguard by a porous mudguard 3 allows an improvement of the insulation in medium frequency (315-2000 Hz), this by eliminating an antiresonance of the "double wall" system before the "breath rate".

Par ailleurs, comme mentionné avant, l’amélioration des performances de l’ensemble 1 en matière de protection acoustique s’accompagne d’une baisse de poids très significative dudit ensemble.Moreover, as mentioned before, the improvement in the performance of set 1 in terms of acoustic protection is accompanied by a very significant drop in weight of said set.

Sur la base des valeurs de masse surfacique explicitées en légende des figures 3, on observe que la réalisation selon l’invention permet de réaliser un allègement de l’ensemble 1 de près de 2000 g/m² (1980 g/m² précisément), soit de presque 20%.On the basis of the surface mass values explained in the legend of Figures 3, it is observed that the embodiment according to the invention makes it possible to achieve a reduction in the assembly 1 of nearly 2000 g/m² (1980 g/m² precisely), i.e. by almost 20%.

Enfin, la rigidité en flexion du panneau 5 est améliorée.Finally, the bending rigidity of the panel 5 is improved.

Une comparaison entre la référence selon l’art antérieur et selon la réalisation de l’invention, selon les compositions explicitées en légende des figures 3, montre que la couche de renfort 7 selon l’invention présente un module de rigidité en flexion (B = E.h3/12, avec E : module de Young (Pa) ; h : épaisseur de la couche (m)) de 0,11 N/m, alors que ledit module est de 0,02 N/m pour la référence, ce qui entraîne une rigidification notoire du panneau 5 selon l’invention.A comparison between the reference according to the prior art and according to the embodiment of the invention, according to the compositions explained in the legend of FIGS. 3, shows that the reinforcing layer 7 according to the invention has a flexural stiffness modulus (B = Eh 3/12 , with E: Young's modulus (Pa); h: thickness of the layer (m)) of 0.11 N/m, whereas said modulus is 0.02 N/m for the reference, this which leads to a noticeable stiffening of the panel 5 according to the invention.

Claims (9)

Ensemble de garnissage latéral de compartiment à bagages de véhicule automobile, ledit ensemble comprenant une tôle (2) solidaire de la caisse du véhicule, ledit ensemble comprenant en outre :
  • du côté extérieur, un pare-boue (3) à base d’une couche de matériau fibreux thermo-compressée comprenant des fibres de base liées entre elles par des fibres de liaison fusibles, ledit pare-boue étant disposé généralement à distance de ladite tôle de manière à créer une lame d’air (11) selon au moins 90% de sa surface,
  • du côté intérieur, un panneau (5) de recouvrement de ladite tôle, ledit panneau comprenant successivement, en se dirigeant vers ladite tôle :
    • une couche d’aspect (6) intérieur à base de matériau fibreux,
    • une couche de renfort (7) mécanique à base de matériau fibreux, ladite couche comprenant des fibres de renfort et des fibres fines d’absorption acoustique liées entre elles par des fibres de liaison fusibles, la masse surfacique de ladite couche étant comprise entre 400 et 2000 g/m², ladite couche présentant un module de Young en compression supérieur à 1 MPa,
    • un film (8) d’étanchéité de masse surfacique inférieure à 150 g/m² collé sur ladite couche de renfort,
    • une couche d’absorption (9) à base de matériau fibreux comprenant des fibres de base liées entre elles par des fibres de liaison fusibles, lesdites fibres de base présentant un titre inférieur à 2 dtex, ladite couche présentant une masse volumique inférieure à 35 kg/m3et une épaisseur minimale de 25 mm sur au moins 90% de sa surface.
Motor vehicle luggage compartment side trim assembly, said assembly comprising a sheet (2) secured to the body of the vehicle, said assembly further comprising:
  • on the outer side, a mudguard (3) based on a layer of thermo-compressed fibrous material comprising base fibers bonded together by fusible bonding fibers, said mudguard being disposed generally at a distance from said sheet so as to create an air gap (11) along at least 90% of its surface,
  • on the inside, a panel (5) covering said sheet, said panel successively comprising, moving towards said sheet:
    • an interior appearance layer (6) based on fibrous material,
    • a mechanical reinforcing layer (7) based on fibrous material, said layer comprising reinforcing fibers and fine acoustic absorption fibers bonded together by fusible bonding fibers, the surface mass of said layer being between 400 and 2000 g/m², said layer having a Young's modulus in compression greater than 1 MPa,
    • a sealing film (8) with a surface weight of less than 150 g/m² bonded to said reinforcing layer,
    • an absorption layer (9) based on fibrous material comprising base fibers bonded together by fusible bonding fibers, said base fibers having a titer of less than 2 dtex, said layer having a density of less than 35 kg /m 3 and a minimum thickness of 25 mm over at least 90% of its surface.
Ensemble selon la revendication 1, caractérisé en ce que la couche de renfort (7) présente la composition suivante :
  • les fibres de renfort sont présentes à hauteur de 25 à 40% en poids de ladite couche,
  • les fibres d’absorption sont présentes à hauteur de 15 à 35% en poids de ladite couche,
  • les fibres de liaison sont présentes à hauteur de 35 à 50% en poids de ladite couche.
Assembly according to Claim 1, characterized in that the reinforcing layer (7) has the following composition:
  • the reinforcing fibers are present at 25 to 40% by weight of said layer,
  • the absorption fibers are present at 15 to 35% by weight of said layer,
  • the binding fibers are present at 35 to 50% by weight of said layer.
Ensemble selon l'une des revendications précédentes, caractérisé en ce que les fibres de renfort sont :
  • des fibres de polyéthylène téréphtalate (PET) de titre compris entre 6 et 17 dtex,
  • et/ou des fibres de verre de diamètre compris entre 20 et 40 microns,
  • et/ou des fibres naturelles prises d’un seul type ou mélangées entre différentes types.
Assembly according to one of the preceding claims, characterized in that the reinforcing fibers are:
  • polyethylene terephthalate (PET) fibers with a titer of between 6 and 17 dtex,
  • and/or glass fibers with a diameter of between 20 and 40 microns,
  • and/or natural fibers taken from a single type or mixed between different types.
Ensemble selon l'une quelconque des revendications précédentes, caractérisé en ce que les fibres d’absorption sont à base de polyéthylène téréphtalate de titre compris entre 0,1 et 3,3 dtex.Assembly according to any one of the preceding claims, characterized in that the absorption fibers are based on polyethylene terephthalate with a titer of between 0.1 and 3.3 dtex. Ensemble selon l'une quelconque des revendications précédentes, caractérisé en ce que la couche d’absorption (9) comprend entre 25 et 30% en masse de fibres de liaison.Assembly according to any one of the preceding claims, characterized in that the absorption layer (9) comprises between 25 and 30% by mass of binding fibers. Ensemble selon l'une quelconque des revendications précédentes, caractérisé en ce que les fibres de base de la couche d’absorption (9) sont à base de polyester et/ou de polypropylène.Assembly according to any one of the preceding claims, characterized in that the base fibers of the absorption layer (9) are based on polyester and/or polypropylene. Ensemble selon l'une quelconque des revendications précédentes, caractérisé en ce que les fibres de base de la couche d’absorption (9) présentent un titre inférieur à 2 dtex.Assembly according to any one of the preceding claims, characterized in that the base fibers of the absorption layer (9) have a count of less than 2 dtex. Ensemble selon l'une quelconque des revendications précédentes, caractérisé en ce que la couche d’absorption (9) présente, selon la norme ISO 3386-1 (01.06.1986), une caractéristique de contrainte en compression CC75inférieure à 20 kPa.Assembly according to any one of the preceding claims, characterized in that the absorption layer (9) has, according to standard ISO 3386-1 (01.06.1986), a compressive stress characteristic CC 75 of less than 20 kPa. Ensemble selon l'une quelconque des revendications, caractérisé en ce que les fibres de liaison de la couche de renfort (7) et/ou de la couche d’absorption (9) et/ou du pare-boue (3) sont :
  • des fibres de polypropylène,
  • ou des fibres bi-composant (10) comprenant une âme (12) à haut point de fusion et une gaine (13) à point de fusion moindre, ladite gaine assurant la liaison entre les fibres consécutivement à sa fusion.
Assembly according to any one of the claims, characterized in that the binding fibers of the reinforcement layer (7) and/or of the absorption layer (9) and/or of the mudguard (3) are:
  • polypropylene fibers,
  • or two-component fibers (10) comprising a core (12) with a high melting point and a sheath (13) with a lower melting point, said sheath ensuring the connection between the fibers following its fusion.
FR2114025A 2021-12-20 2021-12-20 Motor vehicle luggage compartment side trim assembly Active FR3130719B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017178717A1 (en) * 2016-04-12 2017-10-19 Cera Aps Method for producing a soundproofing trim panel for the interior of a motor vehicle
FR3078283A1 (en) * 2018-02-23 2019-08-30 Faurecia Automotive Industrie METHOD FOR MANUFACTURING A MOTOR VEHICLE SOUND SYSTEM AND ASSOCIATED SOUND SYSTEM
WO2020127090A1 (en) * 2018-12-18 2020-06-25 Treves Products, Services & Innovation Acoustic protection system for motor vehicle mudguard
WO2021122523A1 (en) * 2019-12-16 2021-06-24 Treves Products, Services & Innovation Acoustic shield

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017178717A1 (en) * 2016-04-12 2017-10-19 Cera Aps Method for producing a soundproofing trim panel for the interior of a motor vehicle
FR3078283A1 (en) * 2018-02-23 2019-08-30 Faurecia Automotive Industrie METHOD FOR MANUFACTURING A MOTOR VEHICLE SOUND SYSTEM AND ASSOCIATED SOUND SYSTEM
WO2020127090A1 (en) * 2018-12-18 2020-06-25 Treves Products, Services & Innovation Acoustic protection system for motor vehicle mudguard
WO2021122523A1 (en) * 2019-12-16 2021-06-24 Treves Products, Services & Innovation Acoustic shield

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