EP1954532A1 - Element d'isolation acoustique et procede pour sa fabrication - Google Patents

Element d'isolation acoustique et procede pour sa fabrication

Info

Publication number
EP1954532A1
EP1954532A1 EP06819759A EP06819759A EP1954532A1 EP 1954532 A1 EP1954532 A1 EP 1954532A1 EP 06819759 A EP06819759 A EP 06819759A EP 06819759 A EP06819759 A EP 06819759A EP 1954532 A1 EP1954532 A1 EP 1954532A1
Authority
EP
European Patent Office
Prior art keywords
layer
sound
skin
spray
air
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Withdrawn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
EP06819759A
Other languages
German (de)
English (en)
Inventor
Dirk Soltau
Michael Hansen
Paul SCHÖNZART
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.)
Carcoustics Techconsult GmbH
Original Assignee
Carcoustics Techconsult GmbH
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 Carcoustics Techconsult GmbH filed Critical Carcoustics Techconsult GmbH
Publication of EP1954532A1 publication Critical patent/EP1954532A1/fr
Withdrawn legal-status Critical Current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
    • B60R13/083—Acoustic or thermal insulation of passenger compartments for fire walls or floors
    • 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

Definitions

  • the invention relates to a soundproofing part, in particular for motor vehicles, having at least one sound-absorbing layer and at least one heavy-duty layer directly connected thereto in substance, and to a method for the production thereof.
  • Such sound insulation parts are known and are used for example as a front wall paneling in the passenger compartment of motor vehicles. They represent an acoustic spring-mass system, wherein the sound-absorbing layer acts as an elastic spring and the heavy layer forms the mass.
  • the sound-absorbing layer is usually made of a soft foam or non-woven fabric, while the heavy layer is often made of filler-containing elastomer.
  • the heavy layer is for this purpose, for example, produced by injection molding or injection compression molding, is substantially airtight and usually has a smooth surface.
  • the connection of the heavy layer with the sound-absorbing layer is carried out in particular as a cohesive connection by the foam layer is foam-backed with a foam material serving as echallabsorb Schl layer.
  • the present invention is therefore based on the object to provide a sound insulation part of the type mentioned, which offers the same or preferably even reduced manufacturing costs an improved acoustic, especially sound-absorbing efficiency.
  • the weight of such a sound-insulating part is to be reduced with improved acoustic efficiency over the weight of conventional sound-insulating parts of this type. This object is achieved by a sound insulation part with the features of claim 1.
  • the soundproofing part according to the invention is characterized in that the heavy layer consists of a microporous sprayed skin which has at least one air-permeable partial surface region and at least one air-impermeable partial surface region.
  • the sound insulation part according to the invention is particularly suitable for interior lining of body surfaces.
  • a heavy layer with a specific local layer thickness distribution can be realized.
  • the layer thicknesses of the spray skin are, for example, 0.3 to 6 mm, and are in particular in the range of 0.4 and 5 mm.
  • one or more air-impermeable sub-area regions can be generated on the heavy layer specifically, which sound-absorbing effect, as well as specifically one or more air-permeable sub-area areas, which act sound-absorbing.
  • a heavy layer with a specific local porosity distribution can result.
  • the sprayed skin of the sound-insulating part according to the invention is preferably produced by means of a robot.
  • the spray material (heavy layer material) can be sprayed directly onto the sound-absorbing layer.
  • the heavy layer material in an open Cavity of a mold is sprayed, and then that the generated spray is foamed back to produce the sound-absorbing layer.
  • the foam back can also be done with the cavity open.
  • the cavity is closed after production of the spray skin and the sprayed skin is backfoamed in the closed mold.
  • the backing in the closed mold allows faster processing times.
  • the spraying technique offers very flexible acoustic design possibilities of the heavy layer with regard to their layer thickness distribution as well as with regard to the partial formation of airtight and air-permeable surface areas. It can be produced using only a single mold having a suitable open cavity very differently shaped heavy layers. The tool costs for the production of a sound-insulating part according to the invention are thus comparatively small.
  • the heavy layer of the sound insulation part according to the invention consists of a microporous spray skin, which has at least one air-permeable surface portion and thereby taken, at least in its air-permeable surface portion, a sound-absorbing effect.
  • the air-impermeable partial surface area of the spray through special Design of the spray process so that it is on the one hand dense, but on the other hand also has an open-pore, microporous surface structure, which has a not insignificant sound-absorbing effect.
  • the present invention provides for a spatially different adjustment of the flow resistance of the heavy layer or of the sound insulation part as a function of the specific target specifications.
  • the arrangement of the heavy layer can also be limited specifically to a specific area of the sound-absorbing layer. Furthermore, it is within the scope of the present invention to provide the sound-absorbing layer not over the entire surface, but only partially with island-like separated heavy-layer faces in order to minimize the weight of the sound-insulating part.
  • the sound-absorbing layer is preferably formed from polyurethane foam, integral foam, lightweight foam, cardboard, glass fibers, mineral wool and / or a non-woven.
  • An advantageous embodiment of the sound insulation part according to the invention provides that the or each air-permeable part of surface regions of the heavy layer are formed so that they have a length-related Ströitiungswiderstand in the range from 4 to 35 kNs / m 4 have. Investigations have shown that in This area can achieve a high degree of sound absorption.
  • a further advantageous embodiment of the sound insulation part according to the invention consists in that the sprayed skin is formed in a multi-layered manner, wherein a first spray skin layer, which is directly connected to the sound-absorbing layer, has a greater length-related flow resistance than a second spray skin layer, which is applied directly to the first spray skin layer. Studies have shown that the sound absorption coefficient can be further improved by this design.
  • Fig. 1 is a plan view of a front wall panel for a motor vehicle
  • FIG. 2 shows a schematic plan view of an impedance-optimized sound insulation part according to the invention
  • FIG. 3 shows a side view of a system for producing a sound insulation part according to the invention
  • Fig. 4 shows a sectional view of a section of a sound insulation part according to the invention
  • Fig. 5 is a sectional view of a portion of a sound insulation member according to the invention in a further variant.
  • Fig. 1 shows a sound insulation part 1 in the form of a front wall paneling for a motor vehicle.
  • the end wall cladding 1 has a sound-absorbing layer, which is provided with a heavy layer 2.
  • the end wall paneling has a plurality of apertures 3.1, 3.2, which the arrangement or passage of vehicle units such. Air conditioning parts, electrical wiring, a pedals, etc. serve. On the end wall paneling a plurality of stiffening ribs 4 and integrally molded support members 5 are formed for attachment of lines or the like.
  • the heavy layer 2 is connected directly cohesively with the sound-absorbing layer.
  • the heavy layer consists of a microporous spray skin which has at least one air-permeable partial surface area and at least one air-impermeable partial area area.
  • the spray skin has locally different layer thicknesses and / or locally different basis weights.
  • the sound-insulating part 1 according to the invention has an impedance-optimized spray skin which has a substantially sound-damping effect in one or more selected surface regions and substantially sound-damping (sound-absorbing) in one or more other surface regions.
  • FIG. 2 of FIG. 1 corresponding end wall panel 1 is shown schematically.
  • the front wall The lining according to FIG. 2 is a semi-finished product and does not yet have the apertures (3.1, 3.2) shown in FIG. 1, which can be produced, for example, by punching in a later working step.
  • the heavy layer 2 ⁇ spray skin ⁇ has several different partial surface areas 2.1, 2.2, 2.3, which are marked in Fig. 2 by different Schraffüren.
  • the different partial surface areas 2.1, 2.2, 2.3 of the spray skin differ in particular with respect to their layer thickness.
  • the diagonally increasing hatched areas 2.1 e.g. have a layer thickness in the range of 0.5 to 1.5 mm
  • a surface area 2.2 of the spray skin which is here cross-hatched to indicate diagonal descending
  • the reticulated area 2.3 of the sprayed skin for example, has a layer thickness in the range from 1 to 2.5 mm.
  • the layer thickness of the spray is 0 to 1 mm; i.e. in this area (2.4 ⁇ there is no heavy layer under certain circumstances.
  • the layer thickness distribution is vehicle-specific and selected as a function of the local sound level and / or sound frequency distribution for the most frequent operating state of the respective motor vehicle.
  • FIGS. 3 to 5 The structure and manufacture of a sound-insulating part 1 according to the invention is further illustrated in FIGS. 3 to 5.
  • the heavy-layer material is introduced by means of a multi-axis robot 6 into an open cavity of a molding tool 9. sprayed.
  • the axes of movement of the robot 6 are characterized in particular by the double arrows A, B and C.
  • the arm 7 of the robot 6 is provided with at least one spray nozzle 8.
  • spraying material hereinavy layer material
  • spraying material preferably polyurethane, thermoplastics and / or elastomers are used.
  • the spray material is transported by compressed air from the spray nozzle 8 into the cavity of the molding tool 9 or onto the shell-absorbing layer.
  • the application of the spray material is similar to the operation of an ink jet printer.
  • the application of the heavy layer (spray skin) 2 can be done in particular by electrostatic spraying. This may be a purely electrostatic or electrostatically assisted spray process. In the former, fine-grained heavy-layer material is atomized solely by electrostatic forces and transported along the field lines to the sound-absorbing layer. In the second case, the atomization is conventional with a compressed air spray nozzle 8 and a subsequent electrical charge.
  • a three-dimensionally formed, sound-absorbing layer (not shown in FIG. 3) is inserted, which is produced as a molded part in an upstream working step.
  • the sound-absorbing layer 10 (see Figures 4 and 5) consists for example of polyurethane foam and can be produced in a scouring tool. However, it is also possible to use an open-pored, thermoplastic foam for the sound-absorbing layer 10, which is permanently brought into the desired shape by hot forming.
  • the three-dimensionally formed, sound-absorbing layer 10 can also be formed from non-woven material, in particular a needle-punched nonwoven, glass fibers, mineral wool and / or cardboard.
  • the heavy-layer material is targeted at ambient pressure and metered directly - ie without intermediate film (barrier layer) or the like - sprayed onto the sound-absorbing layer 10.
  • a microporous, impedance-optimized spray skin 2 is produced, which is characterized by at least one air-permeable partial surface region and at least one air-impermeable partial surface region.
  • the heavy-layer material can also be sprayed at ambient pressure into an empty cavity of a molding tool 9.
  • the sound-absorbing layer is then subsequently produced by foam-back of the sprayed skin 2.
  • the sound-absorbing layer 10 consists of polyurethane foam or lightweight foam.
  • the spray skin (heavy layer) 2 directly connected thereto is arranged on the side of the sound insulation part 1 'facing the passenger compartment in the solid state has one or more air-permeable surface portions 2.5, which have a length-related flow resistance in the range of 4 to 35 kNs / m 4 , preferably 8 to 30 kNs / m 4 .
  • the microporous, air-permeable surface portions 2.5 have in this embodiment, a smaller layer thickness than adjacent thereto impermeable executed partial surface areas 2.6.
  • the porous surface structure 2:51 may also be referred to as "Sprenkelhaut ⁇ or" orange peel ".
  • an opening 3.1, 3.2 In the edge region of an opening 3.1, 3.2 (see Fig. 1) preferably no spray skin is applied, so that the sound-absorbing layer is exposed there, whereby the sound absorption at perforations 3.1, 3.2, for example in the area of the pedals or an air-conditioning unit, can be optimized.
  • the sound-absorbing layer 10 ' consists of a needle-punched nonwoven fabric.
  • the spray skin (heavy layer) 2 which in turn is directly connected to the sound-absorbing layer 10 ', has a multilayer structure in this exemplary embodiment.
  • the sprayed skin 2 is locally different in terms of their layer thickness, air permeability or air impermeability and their basis weight.
  • a relatively thin, airborne permeable spray skin is provided which has a thickness of about 1 to 1.5 mm and a length-related flow resistance in the range of 10 to 20 kNs / m 4 .
  • an air-impermeable spray skin 2.6 is applied, which is about 5 to 6 mm thick.
  • a first microporous spray skin layer 2.7 and subsequently a second microporous spray skin layer 2.8 are applied.
  • the two layers 2.7, 2.8 have different porosities.
  • the first spray skin layer 2.7 which is directly connected to the sound-absorbing layer 10 ', has a greater length-related flow resistance than the second spray skin layer 2.8.
  • the inventive sound-insulating part (1, 1 ', 1' ') for example, also have surface areas without spray skin.
  • the sound insulation part (1, 1 ', 1' ') according to the invention can be designed not only as a front wall cladding, but in particular as a floor covering (carpet substructure) for the passenger compartment or boot lining.

Landscapes

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

Abstract

L'invention concerne un élément d'isolation acoustique (1), utilisé notamment pour des véhicules automobiles, comprenant au moins une couche d'absorption des sons (10) et au moins une couche lourde (2) connectée à celle-ci directement par liaison de matière, ainsi que des procédés pour sa fabrication. L'objectif de l'invention est de fabriquer un tel élément d'isolation acoustique (1) à moindre coût et d'améliorer son efficacité d'absorption des sons. A cet effet, la couche lourde (2) est réalisée sous forme de peau pulvérisée microporeuse, de manière à ce qu'elle présente au moins une zone de surface partielle (2.5) perméable à l'air et au moins une zone de surface partielle (2.6) imperméable à l'air.
EP06819759A 2005-11-28 2006-11-24 Element d'isolation acoustique et procede pour sa fabrication Withdrawn EP1954532A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510056840 DE102005056840B3 (de) 2005-11-28 2005-11-28 Schallisolationsteil und Verfahren zu dessen Herstellung
PCT/EP2006/068896 WO2007060222A1 (fr) 2005-11-28 2006-11-24 Element d'isolation acoustique et procede pour sa fabrication

Publications (1)

Publication Number Publication Date
EP1954532A1 true EP1954532A1 (fr) 2008-08-13

Family

ID=37672232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06819759A Withdrawn EP1954532A1 (fr) 2005-11-28 2006-11-24 Element d'isolation acoustique et procede pour sa fabrication

Country Status (3)

Country Link
EP (1) EP1954532A1 (fr)
DE (1) DE102005056840B3 (fr)
WO (1) WO2007060222A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006009134B4 (de) 2006-02-24 2016-03-24 Bayer Materialscience Aktiengesellschaft Verbessertes Verfahren zur Herstellung einer leichten, schallisolierenden Verkleidung für Kraftfahrzeuge und entsprechende Verkleidung
DE102007020832B4 (de) 2007-05-02 2009-02-26 Bayer Materialscience Ag Leichte, schallisolierende Verkleidung für ein Karosserieteil eines Kraftfahrzeuges und Verfahren zu deren Herstellung
DE102007032728A1 (de) 2007-07-13 2009-01-15 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Dämmanordnung
DE102010002049B4 (de) * 2010-02-17 2019-06-27 Röchling Automotive AG & Co. KG Akustisch absorbierend wirksames KFZ-Innenverkleidungsbauteil
DE102010035431A1 (de) 2010-08-26 2012-03-01 Entwicklungsgesellschaft für Akustik (EfA) mit beschränkter Haftung Breitbandiger Schallabsorber
DE102011078935A1 (de) 2011-07-11 2013-01-17 Bayerische Motoren Werke Aktiengesellschaft Hochabsorptives Schallisolationsbauteil, insbesondere für den Kraftfahrzeuginnenraum
DE202012012230U1 (de) 2012-12-21 2014-03-24 Industrie Lackierungen Reindl GmbH Vorrichtung zum Auftragen einer pastösen Masse
DE102015114379A1 (de) * 2015-08-28 2017-03-02 Carcoustics Techconsult Gmbh Verfahren zum Herstellen eines Formteils zur Schalldämmung einer Einbauvorrichtung

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Publication number Priority date Publication date Assignee Title
DE2930966C2 (de) * 1979-07-31 1983-12-22 Teroson Gmbh, 6900 Heidelberg Verfahren zur Herstellung eines schalldämmenden Formteils
DE3624427A1 (de) * 1986-07-18 1988-01-21 Stankiewicz Alois Dr Gmbh Adhaesives zerstoerungsfrei entfernbares isolationssystem
GB2216081A (en) * 1988-03-31 1989-10-04 Kasai Kogyo Kk Automotive accoustic insulation panel assemblies
CH684398A5 (de) * 1991-04-26 1994-09-15 Matec Holding Ag Formstabiles Verbundteil.
PL201313B1 (pl) * 1999-08-11 2009-03-31 Entwicklungsgesellschaft Fuer Element osłonowy lub kształtowy dla środków komunikacji
DE10057368A1 (de) * 2000-11-18 2002-05-23 Bayerische Motoren Werke Ag Isolationsschicht insbesondere für Kraftfahrzeug-Karosserieteile
FR2843120B1 (fr) * 2002-07-31 2004-10-22 Plasto Sa Element complexe adhesif et son utilisation pour la fabrication d'un panneau d'etancheite et/ou d'insonorisation dans des vehicules automobiles

Non-Patent Citations (1)

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Title
See references of WO2007060222A1 *

Also Published As

Publication number Publication date
WO2007060222A1 (fr) 2007-05-31
DE102005056840B3 (de) 2007-04-12

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