EP0095125B1 - Plane element for sound-wave absorption - Google Patents

Plane element for sound-wave absorption Download PDF

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Publication number
EP0095125B1
EP0095125B1 EP83104841A EP83104841A EP0095125B1 EP 0095125 B1 EP0095125 B1 EP 0095125B1 EP 83104841 A EP83104841 A EP 83104841A EP 83104841 A EP83104841 A EP 83104841A EP 0095125 B1 EP0095125 B1 EP 0095125B1
Authority
EP
European Patent Office
Prior art keywords
film
sound
foam layer
wave absorption
foam
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.)
Expired
Application number
EP83104841A
Other languages
German (de)
French (fr)
Other versions
EP0095125A2 (en
EP0095125A3 (en
Inventor
Walter Machholz
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.)
Metzeler Schaum GmbH
Original Assignee
Metzeler Schaum 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 Metzeler Schaum GmbH filed Critical Metzeler Schaum GmbH
Publication of EP0095125A2 publication Critical patent/EP0095125A2/en
Publication of EP0095125A3 publication Critical patent/EP0095125A3/en
Application granted granted Critical
Publication of EP0095125B1 publication Critical patent/EP0095125B1/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24496—Foamed or cellular component
    • Y10T428/24504—Component comprises a polymer [e.g., rubber, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24562—Interlaminar spaces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24826—Spot bonds connect components

Definitions

  • the invention relates to a flat element for airborne sound absorption, consisting of a flexible, open-cell foam layer with an air-impermeable cover layer made of a film.
  • GB-A-1 579 897 Also known from GB-A-1 579 897 is a laminated, multilayer sound absorber, in which an air-impermeable film is connected to the actual absorber material as protection against contamination via a perforated or highly air-permeable spacer layer.
  • This elastic spacer layer has the task, on the one hand, of providing the necessary mechanical strength to the film which is untensioned due to the avoidance of reflection and, on the other hand, of allowing the sound waves to continue unimpeded into the absorber material, where they are then converted into heat.
  • the absorption essentially depends on the position and width of the frequency band.
  • the coordination between film and foam mass, i.e. their mutual assignment, attachment and mass ratio are often decisive. It is also essential that no additional fasteners are used in the form of foreign substances that would negatively affect the damping.
  • the invention has for its object to provide an element for airborne noise reduction, which has a higher efficiency compared to the known arrangements and which can be easily adapted in a wide range in terms of frequency and bandwidth.
  • the foam layer has at least on one side a profiled surface with wave-shaped, mutually offset bumps, on the profile tips of the membrane-like stretched plastic film with a thickness of less than 50 microns is selectively attached.
  • the corresponding hump-like profiling of the foam and the selective attachment of the film ensures that the film can practically vibrate like a freely stretched membrane.
  • the air cushion / plastic film resonance system also contributes to particularly good damping.
  • Such a structure dampens in particular low to medium frequencies.
  • the damping is essentially dependent on the film thickness in the sense that when the film becomes thicker, the lower frequencies are damped. In principle, attenuation to lower frequencies is possible by reinforcing the film and / or foam.
  • Another possible variation of the damping consists in changing the shape or the depth of the profile. It has been found to be particularly advantageous that the film and foam are connected directly to one another.
  • the foam layer 1 has a profiled surface with mutually offset rows of bumps 2 and 3.
  • a polyurethane foam with a bulk density of 16 to about 80 kg / m 3 can expediently be used as the material.
  • a thin plastic film 4 is then laminated onto the bump-like profile tips in such a way that the plastic film 4 is only connected to the foam at the profile tips 5 and 6.
  • the connection is expediently made by flame lamination, so that no additional material, such as adhesive, hinders the damping.
  • the film is expediently thinner than 50 microns and can consist of polyurethane, polyethylene or polyvinyl chloride.
  • the film 4 is connected to the foam only at relatively small points 5 and 6 which are far apart in relation to the fastening surface. This results in a large effective area of exposed film areas, which can vibrate freely like a membrane and thereby extract energy from the impinging sound waves, so that optimal damping is achieved.
  • the main areas of application for such flat elements are sound-absorbing linings of machine housings or motor enclosures or corresponding cabins.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)

Description

Flächiges Element zur Luftschall-AbsorptionFlat element for airborne sound absorption

Die Erfindung betrifft ein flächiges Element zur Luftschall-Absorption, bestehend aus einer flexiblen, offenzelligen Schaumstoffschicht mit einer luftundurchlässigen Deckschicht aus einer Folie.The invention relates to a flat element for airborne sound absorption, consisting of a flexible, open-cell foam layer with an air-impermeable cover layer made of a film.

Bei üblichen Luftschall-Absorptionsmaterialien wird im allgemeinen eine dünne Folie lose auf das poröse Material gelegt oder aber damit ganzflächig fest verbunden. Derartige, folienkaschierte Schaumstoffe können dabei die Charakteristik von Feder-Masse-Systemen annehmen, wodurch eine relativ gute Dämpfung (Absorption) in einem relativ schmalen Frequenzbereich erreicht wird.In the case of conventional airborne sound absorption materials, a thin film is generally placed loosely on the porous material or else firmly connected to the entire surface. Such foil-laminated foams can take on the characteristics of spring-mass systems, as a result of which a relatively good damping (absorption) is achieved in a relatively narrow frequency range.

Bekannt ist auch aus der GB-A-1 579 897 ein laminierter, mehrschichtiger Schallabsorber, bei dem eine luftundurchlässige Folie als Schutz gegen Verschmutzung über eine durchbrochene bzw. stark luftdurchlässige Abstandschicht mit dem eigentlichen Absorbermaterial verbunden ist. Diese elastische Abstandschicht hat die Aufgabe, einerseits der wegen Vermeidung der Reflexion ungespannten Folie die notwendige mechanische Festigkeit zu geben und andererseits die Schallwellen ungehindert bis ins Absorbermaterial weiterlaufen zu lassen, wo sie dann in Wärme umgesetzt werden.Also known from GB-A-1 579 897 is a laminated, multilayer sound absorber, in which an air-impermeable film is connected to the actual absorber material as protection against contamination via a perforated or highly air-permeable spacer layer. This elastic spacer layer has the task, on the one hand, of providing the necessary mechanical strength to the film which is untensioned due to the avoidance of reflection and, on the other hand, of allowing the sound waves to continue unimpeded into the absorber material, where they are then converted into heat.

Bei der Schalldämpfung hängt die Absorption wesentlich von der Lage und Breite des Frequenzbandes ab. Dabei ist die Abstimmung zwischen Folie und Schaumstoffmasse, d.h. ihre gegenseitige Zuordnung, Befestigung und Massenverhältnis oft entscheidend. Wesentlich ist dabei auch, daß keine zusätzlichen Befestigungsmittel in Form von Fremdstoffen verwendet werden, die die Dämpfung negativ beeinflussen würden.In the case of sound attenuation, the absorption essentially depends on the position and width of the frequency band. The coordination between film and foam mass, i.e. their mutual assignment, attachment and mass ratio are often decisive. It is also essential that no additional fasteners are used in the form of foreign substances that would negatively affect the damping.

Ausgehend von diesem Stande der Technik liegt der Erfindung die Aufgabe zugrunde, ein Element zur Luftschalldämpfung zu schaffen, das gegenüber den bekannten Anordnungen einen höheren Wirkungsgrad aufweist und das in einem weiten Bereich hinsichtlich Frequenz und Bandbreite leicht angepaßt werden kann.Starting from this prior art, the invention has for its object to provide an element for airborne noise reduction, which has a higher efficiency compared to the known arrangements and which can be easily adapted in a wide range in terms of frequency and bandwidth.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Schaumstoffschicht zumindestens auf einer Seite eine profilierte Oberfläche mit wellenformartig ausgebildeten, gegeneinander versetzten Höckern aufweist, auf deren Profilspitzen die membranartig gespannte Kunststoffolie mit einer Dicke von unter 50 µm punktuell befestigt ist.The object is achieved in that the foam layer has at least on one side a profiled surface with wave-shaped, mutually offset bumps, on the profile tips of the membrane-like stretched plastic film with a thickness of less than 50 microns is selectively attached.

Durch die entsprechende höckerartige Profilierung des Schaumstoffes und die punktuelle Befestigung der Folie wird erreicht, daß die Folie praktisch wie eine freigespannte Membran schwingen kann. So trägt neben der Absorption durch die Schaumstoffschicht zusätzlich das Resonanzsystem Luftpolster/Kunststoffolie zu einer besonders guten Dämpfung bei.The corresponding hump-like profiling of the foam and the selective attachment of the film ensures that the film can practically vibrate like a freely stretched membrane. In addition to absorption through the foam layer, the air cushion / plastic film resonance system also contributes to particularly good damping.

Durch einen derartigen Aufbau werden insbesondere tiefe bis mittlere Frequenzen gedämpft. Die Dämpfung ist dabei wesentlich abhängig von der Foliendicke in dem Sinne, daß bei dicker werdender Folie auch um so tiefere Frequenzen gedämpft werden. Grundsätzlich ist eine Dämpfung nach tieferen Frequenzen durch eine Verstärkung von Folie und/oder Schaumstoff möglich. Eine weitere Variationsmöglichkeit der Dämpfung besteht in einer Änderung der Form bzw. der Tiefe der Profilierung. Besonders vorteilhaft hat sich herausgestellt, daß Folie und Schaumstoff direkt miteinander verbunden sind.Such a structure dampens in particular low to medium frequencies. The damping is essentially dependent on the film thickness in the sense that when the film becomes thicker, the lower frequencies are damped. In principle, attenuation to lower frequencies is possible by reinforcing the film and / or foam. Another possible variation of the damping consists in changing the shape or the depth of the profile. It has been found to be particularly advantageous that the film and foam are connected directly to one another.

Anhand einer schematischen Zeichnung sind Aufbau und Wirkungsweise eines Ausführungsbeispiels nach der Erfindung näher erläutert. Dabei zeigen:

  • Fig. 1 einen Längsschnitt durch ein Luftschall-Absorptionselement und
  • Fig. 2 eine Draufsicht auf dieses Luftschall-Absorptionselement mit den speziellen Verbindungspunkten.
The structure and mode of operation of an exemplary embodiment according to the invention are explained in more detail with reference to a schematic drawing. Show:
  • Fig. 1 shows a longitudinal section through an airborne sound absorption element and
  • Fig. 2 is a plan view of this airborne sound absorption element with the special connection points.

Wie aus Fig. 1 zu ersehen ist, weist die Schaumstoffschicht 1 eine profilierte Oberfläche mit zueinander versetzten Reihen von Höckern 2 und 3 auf. Als Material kann dabei zweckmäßigerweise ein Polyurethanschaum mit einer Rohdichte von 16 bis etwa 80 kg/m3 verwendet werden. Auf die höckerartigen Profilspitzen ist dann eine dünne Kunststoffolie 4 aufkaschiert derart, daß die Kunststoffolie 4 nur an den Profilspitzen 5 und 6 mit dem Schaumstoff verbunden ist. Die Verbindung erfolgt dabei zweckmäßigerweise durch Flammkaschierung, .damit kein zusätzliches Material, wie beispielsweise Klebstoff, die Dämpfung behindert. Die Folie ist dabei zweckmäßigerweise dünner als 50 µm und kann aus Polyurethan, Polyethylen oder Polyvinylchlorid bestehen.As can be seen from Fig. 1, the foam layer 1 has a profiled surface with mutually offset rows of bumps 2 and 3. A polyurethane foam with a bulk density of 16 to about 80 kg / m 3 can expediently be used as the material. A thin plastic film 4 is then laminated onto the bump-like profile tips in such a way that the plastic film 4 is only connected to the foam at the profile tips 5 and 6. The connection is expediently made by flame lamination, so that no additional material, such as adhesive, hinders the damping. The film is expediently thinner than 50 microns and can consist of polyurethane, polyethylene or polyvinyl chloride.

Wie insbesondere aus Fig. 2 zu ersehen ist, ist die Folie 4 nur an relativ kleinen und im Verhältnis zur Befestigungsfläche weit auseinanderliegenden Punkten 5 und 6 mit dem Schaumstoff verbunden. Dadurch ergibt sich eine große wirksame Fläche von freiliegenden Folienbereichen, die wie eine Membran freischwingen können und dadurch den auftreffenden Schallwellen Energie entziehen, so daß eine optimale Dämpfung erreicht wird.As can be seen in particular from FIG. 2, the film 4 is connected to the foam only at relatively small points 5 and 6 which are far apart in relation to the fastening surface. This results in a large effective area of exposed film areas, which can vibrate freely like a membrane and thereby extract energy from the impinging sound waves, so that optimal damping is achieved.

Als Hauptanwendungsgebiete für derarige flächige Elemente können schallabsorbierende Auskleidungen von Maschinengehäusen oder Motorenkapselungen bzw. entsprechende Kabinen gelten.The main areas of application for such flat elements are sound-absorbing linings of machine housings or motor enclosures or corresponding cabins.

Claims (2)

1. Sheet-like element for absorbing air-borne sound, consisting of a flexible, open-cell foam layer with an air-impermeable covering layer consisting of a film, characterised in that the foam layer (1) has, at least on one side, a profiled surface with wavelike-shaped humps (2, 3) which are staggered in relation to each other and to the profiled tips (5, 6) of which the plastic film (4) of a thickness of below 50 flm, which is stretched in a membrane-like manner, is attached pointwise.
2. Sheet-like element according to Claim 1, characterised in that the plastic film (4) and the foam layer (1) are attached to each other by means of flame lamination.
EP83104841A 1982-05-22 1983-05-17 Plane element for sound-wave absorption Expired EP0095125B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3219339A DE3219339C1 (en) 1982-05-22 1982-05-22 Flat element for airborne sound absorption
DE3219339 1982-05-22

Publications (3)

Publication Number Publication Date
EP0095125A2 EP0095125A2 (en) 1983-11-30
EP0095125A3 EP0095125A3 (en) 1984-09-26
EP0095125B1 true EP0095125B1 (en) 1987-05-20

Family

ID=6164288

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EP83104841A Expired EP0095125B1 (en) 1982-05-22 1983-05-17 Plane element for sound-wave absorption

Country Status (5)

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US (1) US4469736A (en)
EP (1) EP0095125B1 (en)
JP (1) JPS58209792A (en)
DE (2) DE3219339C1 (en)
ES (1) ES272335Y (en)

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JPS60113375A (en) * 1983-11-24 1985-06-19 Mitsubishi Plastics Ind Ltd Floppy disk jacket
US4690847A (en) * 1986-06-26 1987-09-01 Burlington Industries, Inc. Cold weather garment structure
IN170733B (en) * 1986-06-26 1992-05-09 Burlington Industries Inc
US4863791A (en) * 1987-04-06 1989-09-05 United Technologies Automotive, Inc. Sound absorption in foam core panels
FR2675936B1 (en) * 1991-04-24 1993-08-20 Noisetec Sa SOUNDPROOFING DEVICE, PARTICULARLY FOR VENTILATION SYSTEMS.
DE9110552U1 (en) * 1991-08-26 1992-12-24 Irbit Research + Consulting Ag, Freiburg/Fribourg, Ch
JPH081114U (en) * 1991-11-20 1996-07-02 株式会社ダイウレ Sound insulation
US5858283A (en) * 1996-11-18 1999-01-12 Burris; William Alan Sparger
JPH1167402A (en) * 1997-08-08 1999-03-09 Harness Sogo Gijutsu Kenkyusho:Kk Sound absorbing material, and cable reel provided with the sound absorbing material
GB9727469D0 (en) * 1997-12-30 1998-02-25 Sugden Kurt D Fabric material
DE10358593A1 (en) * 2003-12-15 2005-07-14 Cellofoam Gmbh & Co. Kg Sound-absorbing sheet-like foam material
DE10358595A1 (en) * 2003-12-15 2005-07-21 Cellofoam Gmbh & Co. Kg Sound-absorbing sheet-like foam material
JP2005283703A (en) * 2004-03-29 2005-10-13 Inoac Corp Sound absorbing material
SI2052828T1 (en) 2007-10-23 2011-05-31 Retro Flex Ag Porous heavy acoustic protection films, acoustic protection system and method for producing a porous heavy acoustic protection film
EP2593614B1 (en) * 2010-07-13 2016-04-13 Bellmax Acoustic Pty Ltd An acoustic panel
GB2486714A (en) * 2010-12-23 2012-06-27 Levolux At Ltd Acoustic louvre having sound energy absorption element encased by a watertight element
EP2909389A4 (en) 2012-10-05 2016-07-13 Soleil Insulation Inc Layered insulation system
US9362799B2 (en) * 2014-04-14 2016-06-07 Cummins Power Generation Ip, Inc. Acoustic covering for a generator set enclosure with pressure sensitive adhesive
RU2593401C1 (en) * 2015-02-25 2016-08-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Воронежский государственный архитектурно-строительный университет" Sound-absorbing panel
RU185081U1 (en) * 2017-07-12 2018-11-21 Общество с ограниченной ответственностью "ШиКор" SOUND INSULATION MATERIAL

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US2984312A (en) * 1959-04-24 1961-05-16 Owens Corning Fiberglass Corp Acoustical wall board
US3360423A (en) * 1961-09-21 1967-12-26 Gen Tire & Rubber Co Flexible structural foam sandwich construction
US3356562A (en) * 1964-06-22 1967-12-05 Cincinnati Ind Inc Materials and methods for the production of stereotype mats
JPS5112856B1 (en) * 1967-05-09 1976-04-22
US3712846A (en) * 1971-06-23 1973-01-23 Carpenter L & Co Acoustical panel
DE2246621A1 (en) * 1972-09-22 1974-03-28 Albert Schrey Sound insulating panel of soft polyurethane foam - resistant to mechanical stress, esp ball impact, for gymnasium use
SE402142B (en) * 1976-06-03 1978-06-19 Becker Wilhelm Ab LAMINATED SOUND ABSORBENT

Also Published As

Publication number Publication date
EP0095125A2 (en) 1983-11-30
JPS58209792A (en) 1983-12-06
US4469736A (en) 1984-09-04
DE3219339C1 (en) 1983-02-03
JPH0444279B2 (en) 1992-07-21
DE3371615D1 (en) 1987-06-25
ES272335U (en) 1983-11-16
ES272335Y (en) 1984-07-01
EP0095125A3 (en) 1984-09-26

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