EP2181226A2 - Sound absorber - Google Patents

Sound absorber

Info

Publication number
EP2181226A2
EP2181226A2 EP08784840A EP08784840A EP2181226A2 EP 2181226 A2 EP2181226 A2 EP 2181226A2 EP 08784840 A EP08784840 A EP 08784840A EP 08784840 A EP08784840 A EP 08784840A EP 2181226 A2 EP2181226 A2 EP 2181226A2
Authority
EP
European Patent Office
Prior art keywords
sound absorber
glass
absorber according
absorption material
sound
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.)
Granted
Application number
EP08784840A
Other languages
German (de)
French (fr)
Other versions
EP2181226B1 (en
Inventor
Erich Diel
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.)
Quattro Schallabsorber GmbH
Original Assignee
QUATTRO SCHALLABSORBER 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 QUATTRO SCHALLABSORBER GmbH filed Critical QUATTRO SCHALLABSORBER GmbH
Publication of EP2181226A2 publication Critical patent/EP2181226A2/en
Application granted granted Critical
Publication of EP2181226B1 publication Critical patent/EP2181226B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/8409—Sound-absorbing elements sheet-shaped
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8423—Tray or frame type panels or blocks, with or without acoustical filling
    • E04B2001/8452—Tray or frame type panels or blocks, with or without acoustical filling with peripheral frame members
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/04—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like
    • E04B2009/0492—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like with fabrics tensioned on frames

Definitions

  • the invention relates to a sound absorber with an absorbent material for absorbing room sound.
  • a sound absorber which is formed as a lamella and depends from a ceiling.
  • the lamella contains or consists of sound-absorbing material.
  • mineral fibers such as glass wool or plastics and wood fibers are proposed.
  • the pillow-shaped enclosure may consist of a glass fabric and the absorption material should consist essentially of glass, glass fiber or the like, which is understood to mean glass wool and mineral wool.
  • the object of the invention is to provide an aforementioned sound absorber with improved sound absorption properties.
  • the glass filament yarns or rovings made of glass filaments or the glass filament fabrics made of glass filament yarns offer a better aptitude for sound insulation or sound absorption than glass fibers and mineral wool or rock wool.
  • the better absorption properties, in particular at lower frequencies, are essentially due to the larger diameters of the glass filament yarns compared to glass filaments or glass fibers.
  • mineral wool, ie glass wool and rock wool with a fiber thickness of usually below 3 microns, as a sound absorption materials in the sound absorber according to the invention should not be used in principle.
  • the absorbent material may also have shares of mineral wool, if this should be appropriate and necessary for sound technical reasons.
  • glass filament yarns While torn fibers are used in glass wool, the fibers and filaments for the glass filament yarns are not torn. Further advantageous properties of glass filament yarns are their flexibility and their moisture resistance, so that they can also be used as absorbent material in swimming pools and other humid environments.
  • the core of the invention thus also lies in the use of glass filament yarns or rovings or glass filament yarns made of glass filament yarns as absorbent material for sound absorbers, whereby glass filaments are excluded and all types of further processed yarns and fabrics and the like can be used as absorbent material ,
  • the glass filament yarns made of glass filaments preferably have a diameter of z. B. 0.01 mm to 3.0 mm and in particular from 0.2 mm to 0.5 mm, but can also be made thinner or thicker.
  • the absorptive The material may also consist of or contain rovings or roving fabrics.
  • the fabric made of glass filament yarns can be understood in general to mean any fabric material which also includes knitted fabric and knitted fabric.
  • this fabric or the like may be selvage that occurs in the manufacture and / or processing of the fabric.
  • B. consists of one or more longitudinal threads or yarns with a plurality of transverse threads or transverse yarns and many of these strips form the absorbent material or the filling of the sound absorber.
  • the sound absorber or the absorption material is formed in the form of a pad or a mat.
  • Such cushions or mats can for example be placed on suspended sound-permeable ceiling constructions, where they can absorb sound.
  • a ceiling construction contains z.
  • the cushions or mats can also be placed in or attached to, on or on other mounts in a room.
  • the absorbent material is at least partially surrounded by a sheath or may be bounded by a boundary. While the absorbent material may perform its function as a loose aggregate, sheet or layer without covering or wrapping, a cladding, coating or barrier provides the advantage of dimensional stability and better handling of the absorbent material or sound absorber.
  • a coating or coating may for example consist of a non-combustible glass fiber fabric, which limits the absorption material on one side or on several sides or z. B. surrounds as a bag.
  • a limitation can also a dimensionally stable, but sound-permeable plate, a grid, a perforated plate or an expanded metal.
  • At least one stitching seam can divide the absorbent material.
  • the at least one stitching seam can subdivide both a layer of the absorbent material and a pad or mat surrounded by an envelope into individual regions and thus provide the absorption material with shape and position stability. If a plurality of grid-like stitching divides the absorption material arranged over a large area into a plurality of smaller areas or chambers, the pillow-like or mat-like shape is retained.
  • round as well as square shape of the sound absorber or the arrangement of the absorbent material edge seams can be made as required or customer request that stabilize the outer shape.
  • the sound absorber has a frame in which the absorption material is accommodated.
  • the absorbent material may be accommodated in any shape or arrangement, for example, a cushion or mat as described above and having a certain stability may be held therein.
  • the absorption material can be accommodated between two carriers or carrier surfaces, in particular gratings, held on the frame, which give stability to the absorption material in any shape and form.
  • the frame with the absorption material is covered on the visible side by a covering, in particular a fabric covering.
  • the fabric cover can be arranged within the frame and can cover the absorbent material or the support surface.
  • FIG. 1 shows a sectional view of a first exemplary embodiment of a sound absorber according to the invention
  • FIG. 2 shows a sectional view of a second embodiment of a sound absorber according to the invention
  • FIG. 3 shows a plan view of a third embodiment of a sound absorber according to the invention.
  • Fig. 4 in a sectional view of the third embodiment of the sound absorber shown in Fig. 3.
  • a sound absorber 10 has a frame 11 (see FIGS. 1 and 2) which is formed from one or more frame parts.
  • the frame parts are cut from a frame profile 12, preferably produced as an aluminum extruded profile, in the required length and with the required miter angle and are joined together in the joint areas.
  • the frame 11 is rectangular.
  • frames in any other shapes, in particular polygonal shapes, can be produced and used.
  • the frame profile 12 is formed by a lower surface 13, a vertical wall 14 adjoining the outer edge thereof and an upper surface 15 projecting inwardly from the upper edge thereof.
  • a vertical wall 14 adjoining the outer edge thereof and an upper surface 15 projecting inwardly from the upper edge thereof.
  • two parallel, upwardly extending webs 16 and 17 are provided with a facing bend at the upper end.
  • two angled webs 18 and 19 are provided.
  • a downwardly projecting groove 20 is formed, which has a groove bottom 21 and groove side walls 22 (see Fig. 2).
  • the terms "lower surface”, “upper surface” and “vertical wall” refer only to the horizontal position shown in FIGS. 1 and 2 and installation position and are not meant to be limiting.
  • the components are also suitable for vertical use, in which case the vertical wall 14 becomes a horizontal lower or upper wall and the lower surface or upper surface becomes a front or rear surface.
  • a cover or a covering 23 may be attached from a flexible fabric or a film in various ways.
  • the covering 23 spans the lower surface 13, the vertical wall 14 and the upper surface 15 of the frame profile 12.
  • the edge region of the covering 23 is inserted into the groove 20 on the upper surface 15 and penetrates therethrough Pressing a terminal block 24 fixed in the groove 20 by a press fit.
  • a tension of the material of the covering 23 takes place at the same time, so that it is stretched tightly over the underside or outside of the frame 11.
  • the edge region of the fabric 23 is placed on the inside of the lower surface 13 of the frame profile 12 via the webs 16, 17 and fixed there by means of a clamping bar 24 'pressed from above.
  • a clamping bar 24 'pressed from above When pressing on the terminal strip 18 'via the webs 16, 17, the material of the clothing 23 is tensioned on the underside of the frame 11 at the same time.
  • the clamping bars 24 and 24 'in Figs. 1 and 2 a uniform U-profile is preferably used, the outer width is designed so that it can be pressed with the interposition of the edge of the fabric 23 in a press fit into the groove 20 and the inner width is dimensioned so that it can be pressed with the interposition of the covering 23 in the press fit on the webs 16, 17.
  • both a covering 23 on the underside (for example according to FIG. 1) and a covering on the upper side of the frame 11 (for example according to FIG. 2) may be provided.
  • the lower fabric 23 as shown in FIG. 2 by pressing the terminal strip 24 'via the webs 16, 17 are fastened and the attachment of a top fabric not shown can be done by pressing the terminal block 24 in the groove 20.
  • a covering 23 completely surrounding the frame can also be fixed in the groove 20 by overlapping the edge regions and pressing them together.
  • the outer sides of the webs 16, 17, the side walls 22 of the groove 20 and / or the inner and / or outer walls of the clamping bar 24 or 24 ' may be provided with additional recesses or projections or teeth to increase the clamping force.
  • the webs 16, 17 and the underside of the groove base 21 also serve as a support or support for an upper or a lower flat thin carrier 25 and 26, between which an absorbent material 27, for example, glass filament yarns made of glass filaments or of glass filament yarns fabric produced in bulk or in the form of a prefabricated part such. B. a pillow or a mat is added.
  • the cover or covering 23 of the sound absorber 10 consists of a permanently flame retardant and non-flammable material according to DIN 4102 - A2. Both from the observance of the fire protection regulations as well as the functionality for soundproofing purposes, a tissue consisting at least predominantly of glass fibers or glass filament yarns or rovings has proven to be highly suitable. Incidentally, such a fabric has excellent durability, is insensitive to moisture and soiling, and can be easily cleaned if necessary.
  • the glass filament yarns preferably made of glass filaments such as E glass yarn or glass filament yarns contains tissue produced, and for sound technical reasons, a proportion of mineral wool may be included.
  • a wrap 29 or coating completely surrounds the absorbent material 27.
  • the coating 29 or the coating is formed for example from a non-combustible glass fiber fabric according to DIN 4102 - A2.
  • Several stitching seams 30, which in particular cross each other at a right angle, subdivide the entire surface of the sound absorber 10 into individual smaller areas or chambers 31 (twelve chambers 31 in the example), in which the absorption material 27 is held stationary and non-displaceable by the stitching seams.
  • an edge seam 32 may join the upper wrap 29 and the lower wrap 29 (if they are not pocketed) and may form a rim bead or the like from the wrap 29 as required.
  • This sound absorber 10 may be formed as a deposit or as a support on supporting structures in open or closed spaces in any size, thickness and shape, such. B. square, triangular or round and as a plate or cylindrical.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Multimedia (AREA)
  • Building Environments (AREA)
  • Woven Fabrics (AREA)

Abstract

The invention relates to a sound absorber (10) having an absorption material (27) for absorption of spatial sound, wherein the invention provides for the absorption material (27) to be formed from glass-filament yarns or rovings, which are produced from glass filaments, or from glass-filament fabric which is produced from glass-filament yarns. Web edge waste which is created during the production and/or the processing of the glass-filament fabric can preferably form the absorption material.

Description

Schallabsorber sound absorber
Die Erfindung betrifft einen Schallabsorber mit einem Absorptionsmaterial zum Absorbieren von Raumschall.The invention relates to a sound absorber with an absorbent material for absorbing room sound.
Die DE 201 10 877 U1 offenbart einen derartigen Schallabsorber, der als Lamelle gebildet ist und von einer Raumdecke herabhängt. Die Lamelle enthält schallabsorbierendes Material oder besteht aus diesem. Als schallabsorbierendes Material werden Mineralfasern wie Glaswolle oder auch Kunststoffe und Holzfasern vorgeschlagen.DE 201 10 877 U1 discloses such a sound absorber, which is formed as a lamella and depends from a ceiling. The lamella contains or consists of sound-absorbing material. As a sound-absorbing material mineral fibers such as glass wool or plastics and wood fibers are proposed.
Aus der DE 20 2006 003 278 U1 ist eine Vorrichtung zur Absorption von Schall bekannt geworden, die ein von einer Umhüllung umgebenes Absorptionsmaterial enthält. Die kissenförmige Umhüllung kann aus einem Glasgewebe bestehen und das Absorptionsmaterial soll in wesentlichen Teilen aus Glas, Glasfaser oder der- gleichen bestehen, wobei hierunter Glaswolle und Mineralwolle verstanden wird.From DE 20 2006 003 278 U1 a device for the absorption of sound has become known, which contains an absorbent material surrounded by an envelope. The pillow-shaped enclosure may consist of a glass fabric and the absorption material should consist essentially of glass, glass fiber or the like, which is understood to mean glass wool and mineral wool.
Aufgabe der Erfindung ist es, einen eingangs genannten Schallabsorber mit verbesserten Schallabsorptionseigenschaften zu schaffen.The object of the invention is to provide an aforementioned sound absorber with improved sound absorption properties.
Diese Aufgabe wird durch einen Schallabsorber mit den Merkmalen des Anspruchs 1 gelöst. Die aus Glasfilamenten hergestellten Glasfilamentgarne oder Rovings bzw. die aus Glasfilamentgarnen hergestellten Glasfilamentgewebe bieten eine gegenüber Glasfasern und Mineralwolle bzw. Steinwolle verbesserte Eignung zur Schalldämmung bzw. Schallabsorption. Die besseren Absorptionseigenschaften, insbe- sondere bei tieferen Frequenzen, sind im wesentlichen auf die größeren Durchmesser der Glasfilamentgarne gegenüber Glasfilamenten oder Glasfasern zurückzuführen. Demnach soll Mineralwolle, d. h. Glaswolle und Steinwolle mit einer Faserdicke von üblicherweise unter 3 μm, als Schallabsorptionsmaterialien bei dem erfindungsgemäßen Schallabsorber grundsätzlich nicht verwendet werden. Jedoch kann das Absorptionsmaterial auch Anteile an Mineralwolle aufweisen, wenn dies aus schalltechnischen Gründen zweckmäßig und erforderlich sein sollte. Während bei Glaswolle gerissene Fasern verwendet werden, sind die Fasern und Filamente für die Glasfilamentgarne nicht gerissen. Weitere vorteilhafte Eigenschaften von Glasfilamentgarnen sind ihre Flexibilität und ihre Feuchtigkeits- beständigkeit, so dass sie auch als Absorptionsmaterial bei Schwimmbädern und anderen feuchten Umgebungen eingesetzt werden können.This object is achieved by a sound absorber having the features of claim 1. The glass filament yarns or rovings made of glass filaments or the glass filament fabrics made of glass filament yarns offer a better aptitude for sound insulation or sound absorption than glass fibers and mineral wool or rock wool. The better absorption properties, in particular at lower frequencies, are essentially due to the larger diameters of the glass filament yarns compared to glass filaments or glass fibers. Accordingly, mineral wool, ie glass wool and rock wool with a fiber thickness of usually below 3 microns, as a sound absorption materials in the sound absorber according to the invention should not be used in principle. However, the absorbent material may also have shares of mineral wool, if this should be appropriate and necessary for sound technical reasons. While torn fibers are used in glass wool, the fibers and filaments for the glass filament yarns are not torn. Further advantageous properties of glass filament yarns are their flexibility and their moisture resistance, so that they can also be used as absorbent material in swimming pools and other humid environments.
Der Kern der Erfindung liegt somit auch in der Verwendung von aus Glasfilamenten hergestellten Glasfilamentgarnen oder Rovings bzw. von aus Glasfilament- garnen hergestellten Glasfilamentgewebe als Absorptionsmaterial für Schallabsorber, wobei Glasfilamente ausgeschlossen sind und alle Arten von weiterverarbeiteten Garnen und Geweben sowie dergleichen als Absorptionsmaterial verwendet werden können.The core of the invention thus also lies in the use of glass filament yarns or rovings or glass filament yarns made of glass filament yarns as absorbent material for sound absorbers, whereby glass filaments are excluded and all types of further processed yarns and fabrics and the like can be used as absorbent material ,
Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous embodiments of the invention are specified in the subclaims.
Während die einzelnen Glasfilamente einen Durchmesser von üblicherweise etwa 3 μm bis 14 μm und insbesondere zwischen 5 μm bis 9 μm aufweisen, haben die aus Glasfilamenten hergestellten Glasfilamentgarne bevorzugt einen Durchmesser von z. B. 0,01 mm bis 3,0 mm und insbesondere von 0,2 mm bis 0,5 mm, können aber auch noch dünner oder auch dicker hergestellt sein. Das Absorpti- onsmaterial kann auch aus den Rovings oder aus Rovinggewebe bestehen oder diese enthalten.While the individual glass filaments have a diameter of usually about 3 .mu.m to 14 .mu.m and in particular between 5 .mu.m to 9 .mu.m, the glass filament yarns made of glass filaments preferably have a diameter of z. B. 0.01 mm to 3.0 mm and in particular from 0.2 mm to 0.5 mm, but can also be made thinner or thicker. The absorptive The material may also consist of or contain rovings or roving fabrics.
Unter dem aus Glasfilamentgarnen hergestellten Gewebe kann allgemein jegli- ches Gewebematerial verstanden werden, das auch Gewirk und Gestrick um- fasst. Insbesondere kann dieses Gewebe oder dergleichen Webkantenabfall sein, der bei der Herstellung und/oder der Verarbeitung des Gewebes anfällt. Ein solcher Webkantenabfall entsteht beim randseitigen Zuschneiden des Gewebes bzw. einer Gewebematte auf Maß, wobei jeweils ein Streifen z. B. aus einem oder mehreren Längsfäden oder -garnen mit einer Vielzahl von Querfäden oder Quergarnen besteht und viele dieser Streifen das Absorptionsmaterial bzw. die Füllung des Schallabsorbers bilden.The fabric made of glass filament yarns can be understood in general to mean any fabric material which also includes knitted fabric and knitted fabric. In particular, this fabric or the like may be selvage that occurs in the manufacture and / or processing of the fabric. Such Webkantenabfall arises when marginal cutting the fabric or a fabric mat to measure, each with a strip z. B. consists of one or more longitudinal threads or yarns with a plurality of transverse threads or transverse yarns and many of these strips form the absorbent material or the filling of the sound absorber.
Die Glasfilamentgarne, die auch als E-Glasgarne (E = electric) bezeichnet wer- den, sind nichtbrennbar nach DIN 4102 - A2.The glass filament yarns, which are also called E-glass yarns (E = electric), are non-combustible according to DIN 4102 - A2.
In einer bevorzugten Ausgestaltung der Erfindung ist der Schallabsorber bzw. das Absorptionsmaterial in Form eines Kissens oder einer Matte gebildet. Solche Kissen oder Matten können beispielsweise auf abgehängte schalldurchlässige De- ckenkonstruktionen gelegt werden, wo sie Schall absorbieren können. Eine solche Deckenkonstruktion enthält z. B. Lochbleche, gelochte Platten oder dergleichen. Die Kissen oder Matten können auch in, an oder auf anderen Halterungen in einem Raum gelegt oder daran befestigt werden.In a preferred embodiment of the invention, the sound absorber or the absorption material is formed in the form of a pad or a mat. Such cushions or mats can for example be placed on suspended sound-permeable ceiling constructions, where they can absorb sound. Such a ceiling construction contains z. As perforated plates, perforated plates or the like. The cushions or mats can also be placed in or attached to, on or on other mounts in a room.
Zweckmäßigerweise ist das Absorptionsmaterial zumindest teilweise von einer Umhüllung umgeben oder kann von einer Begrenzung begrenzt sein. Das Absorptionsmaterial kann seine Funktion zwar auch als lose Anhäufung, Lage oder Schicht ohne Abdeckung oder Umhüllung dergleichen erfüllen, jedoch bietet eine Umhüllung, ein Überzug oder eine Begrenzung den Vorteil einer Formbeständig- keit und besseren Handhabung des Absorptionsmaterials bzw. des Schallabsorbers. Eine solche Umhüllung bzw. Überzug kann beispielsweise aus einem nichtbrennbaren Glasgarngewebe bestehen, das das Absorptionsmaterial einseitig oder mehrseitig begrenzt oder z. B. als Tasche umgibt. Eine Begrenzung kann auch eine formstabile, aber schalldurchlässige Platte, ein Gitter, ein Lochblech oder ein Streckmetall sein.Conveniently, the absorbent material is at least partially surrounded by a sheath or may be bounded by a boundary. While the absorbent material may perform its function as a loose aggregate, sheet or layer without covering or wrapping, a cladding, coating or barrier provides the advantage of dimensional stability and better handling of the absorbent material or sound absorber. Such a coating or coating may for example consist of a non-combustible glass fiber fabric, which limits the absorption material on one side or on several sides or z. B. surrounds as a bag. A limitation can also a dimensionally stable, but sound-permeable plate, a grid, a perforated plate or an expanded metal.
Vorzugsweise kann zumindest eine Steppnaht das Absorptionsmaterial untertei- len. Die zumindest eine Steppnaht kann sowohl eine Lage des Absorptionsmaterials wie auch ein von einer Umhüllung umgebenes Kissen oder eine Matte in einzelne Bereiche unterteilen und damit dem Absorptionsmaterial Form- und Lagestabilität geben. Wenn mehrere gitterartige Steppnähte das großflächig angeordnete Absorptionsmaterial in mehrere kleinere Bereiche oder Kammern unter- teilt, bleibt die kissen- oder mattenartige Form erhalten. Des weiteren können bei runder wie auch bei eckiger Form des Schallabsorbers bzw. der Anordnung des Absorptionsmaterials Randnähte nach Erfordernis bzw. Kundenwunsch hergestellt werden, die die Außenform stabilisieren.Preferably, at least one stitching seam can divide the absorbent material. The at least one stitching seam can subdivide both a layer of the absorbent material and a pad or mat surrounded by an envelope into individual regions and thus provide the absorption material with shape and position stability. If a plurality of grid-like stitching divides the absorption material arranged over a large area into a plurality of smaller areas or chambers, the pillow-like or mat-like shape is retained. Furthermore, with round as well as square shape of the sound absorber or the arrangement of the absorbent material edge seams can be made as required or customer request that stabilize the outer shape.
In einer bevorzugten Ausgestaltung weist der Schallabsorber einen Rahmen auf, in dem das Absorptionsmaterial aufgenommen ist. In dem Rahmen kann das Absorptionsmaterial in beliebiger Gestalt oder Anordnung aufgenommen sein, beispielsweise kann ein Kissen oder eine Matte, wie sie voranstehend beschrieben sind und die eine gewisse Stabilität aufweisen, darin gehalten sein. Andererseits kann in bevorzugter Ausführungsform das Absorptionsmaterial zwischen zwei am Rahmen gehaltenen Trägern oder Trägerflächen, insbesondere Gittern, aufgenommen sein, die dem in beliebiger Gestalt und Form vorliegenden Absorptionsmaterial Stabilität geben.In a preferred embodiment, the sound absorber has a frame in which the absorption material is accommodated. In the frame, the absorbent material may be accommodated in any shape or arrangement, for example, a cushion or mat as described above and having a certain stability may be held therein. On the other hand, in a preferred embodiment, the absorption material can be accommodated between two carriers or carrier surfaces, in particular gratings, held on the frame, which give stability to the absorption material in any shape and form.
Zweckmäßigerweise ist der Rahmen mit dem Absorptionsmaterial sichtseitig von einer Bespannung, insbesondere Stoffbespannung, abgedeckt.Expediently, the frame with the absorption material is covered on the visible side by a covering, in particular a fabric covering.
Andererseits kann die Stoffbespannung innerhalb des Rahmens angeordnet sein und kann das Absorptionsmaterial bzw. die Trägerfläche abdecken.On the other hand, the fabric cover can be arranged within the frame and can cover the absorbent material or the support surface.
Grundsätzlich eignen sich derartige Schallabsorber für das Verbessern der Raumakustik von geschlossenen wie auch von offenen Räumen. Nachfolgend werden Ausführungsbeispiels des Schallabsorbers unter Bezugnahme auf die Zeichnung näher erläutert. Es zeigt:In principle, such sound absorbers are suitable for improving the room acoustics of both closed and open spaces. Hereinafter, embodiment of the sound absorber will be explained with reference to the drawings. It shows:
Fig. 1 in einer Schnittansicht ein erstes Ausführungsbeispiel eines erfin- dungsgemäßen Schallabsorbers;1 shows a sectional view of a first exemplary embodiment of a sound absorber according to the invention;
Fig. 2 in einer Schnittansicht ein zweites Ausführungsbeispiel eines erfindungsgemäßen Schallabsorbers;2 shows a sectional view of a second embodiment of a sound absorber according to the invention;
Fig. 3 in einer Draufsicht ein drittes Ausführungsbeispiel eines erfindungsgemäßen Schallabsorbers; und3 shows a plan view of a third embodiment of a sound absorber according to the invention; and
Fig. 4 in einer Schnittansicht das in Fig. 3 dargestellte dritte Ausführungsbeispiel des Schallabsorbers.Fig. 4 in a sectional view of the third embodiment of the sound absorber shown in Fig. 3.
Ein Schallabsorber 10 weist einen Rahmen 11 auf (siehe Fig. 1 und 2), der aus einem oder mehreren Rahmenteilen gebildet wird. Die Rahmenteile sind aus einem bevorzugt als Aluminium-Strangpressprofil hergestellten Rahmenprofil 12 in der erforderlichen Länge und mit dem erforderlichen Gehrungswinkel geschnitten und werden in den Stoßbereichen zusammengefügt. Im Ausführungsbeispiel ist der Rahmen 11 rechteckig. Es sind jedoch auch Rahmen in beliebigen anderen Formen, insbesondere Polygonformen, herstellbar und verwendbar.A sound absorber 10 has a frame 11 (see FIGS. 1 and 2) which is formed from one or more frame parts. The frame parts are cut from a frame profile 12, preferably produced as an aluminum extruded profile, in the required length and with the required miter angle and are joined together in the joint areas. In the embodiment, the frame 11 is rectangular. However, frames in any other shapes, in particular polygonal shapes, can be produced and used.
Das Rahmenprofil 12 ist von einer unteren Fläche 13, einer an deren Außenkante anschließenden vertikalen Wand 14 und einer von deren Oberkante nach innen vorspringenden oberen Fläche 15 gebildet. An der Innenseite der unteren Fläche 13 sind zwei parallele, sich nach oben erstreckende Stege 16 und 17 mit einer einander zugewandten Abwinklung am oberen Ende vorgesehen. An der Innenseite der vertikalen Wand 14 sind zwei abgewinkelte Stege 18 bzw. 19 vorgese- hen. In der oberen Fläche 15 ist eine nach unten vorspringende Nut 20 ausgebildet, die einen Nutgrund 21 und Nutseitenwände 22 aufweist (siehe Fig. 2). Die Begriffe "untere Fläche", "obere Fläche" und "vertikale Wand" beziehen sich nur auf die in den Fig. 1 und 2 dargestellte horizontale Lage bzw. Einbaulage und sind nicht beschränkend zu verstehen. Selbstverständlich sind die Bauteile auch für eine vertikale Verwendung geeignet, wobei dann die vertikale Wand 14 zu einer horizontalen unteren oder oberen Wand und die untere Fläche oder obere Fläche zu einer vorderen oder hinteren Fläche wird.The frame profile 12 is formed by a lower surface 13, a vertical wall 14 adjoining the outer edge thereof and an upper surface 15 projecting inwardly from the upper edge thereof. On the inside of the lower surface 13, two parallel, upwardly extending webs 16 and 17 are provided with a facing bend at the upper end. On the inside of the vertical wall 14, two angled webs 18 and 19 are provided. In the upper surface 15, a downwardly projecting groove 20 is formed, which has a groove bottom 21 and groove side walls 22 (see Fig. 2). The terms "lower surface", "upper surface" and "vertical wall" refer only to the horizontal position shown in FIGS. 1 and 2 and installation position and are not meant to be limiting. Of course, the components are also suitable for vertical use, in which case the vertical wall 14 becomes a horizontal lower or upper wall and the lower surface or upper surface becomes a front or rear surface.
Am Rahmen 11 kann auf verschiedene Art eine Abdeckung oder eine Bespannung 23 aus einem flexiblen Gewebe oder einer Folie befestigt sein. Im Ausführungsbeispiel gemäß Fig. 1 umspannt die Bespannung 23 die untere Fläche 13, die vertikale Wand 14 und die obere Fläche 15 des Rahmenprofils 12. Der Rand- bereich der Bespannung 23 ist in die Nut 20 an der oberen Fläche 15 eingelegt und wird dort durch Eindrücken einer Klemmleiste 24 in die Nut 20 durch einen Presssitz fixiert. Beim Eindrücken der Klemmleiste 24 in die Nut 20 erfolgt gleichzeitig eine Spannung des Materials der Bespannung 23, so dass diese straff über die Unterseite oder Außenseite des Rahmens 11 gespannt wird.On the frame 11, a cover or a covering 23 may be attached from a flexible fabric or a film in various ways. In the exemplary embodiment according to FIG. 1, the covering 23 spans the lower surface 13, the vertical wall 14 and the upper surface 15 of the frame profile 12. The edge region of the covering 23 is inserted into the groove 20 on the upper surface 15 and penetrates therethrough Pressing a terminal block 24 fixed in the groove 20 by a press fit. When the clamping strip 24 is pressed into the groove 20, a tension of the material of the covering 23 takes place at the same time, so that it is stretched tightly over the underside or outside of the frame 11.
Beim Ausführungsbeispiel gemäß Fig. 2 wird der Randbereich der Bespannung 23 auf der Innenseite der unteren Fläche 13 des Rahmenprofils 12 über die Stege 16, 17 gelegt und dort mittels einer von oben aufgepressten Klemmleiste 24' fixiert. Beim Aufpressen der Klemmleiste 18' über die Stege 16, 17 wird gleichzei- tig das Material der Bespannung 23 an der Unterseite des Rahmens 11 gespannt. Für die Klemmleisten 24 bzw. 24' in den Fig. 1 und 2 wird bevorzugt ein einheitliches U-Profil verwendet, dessen Außenbreite so ausgelegt ist, dass sie unter Zwischenlage des Randes der Bespannung 23 im Presssitz in die Nut 20 gedrückt werden kann und deren innere Weite so bemessen ist, dass sie unter Zwischenlage der Bespannung 23 im Presssitz über die Stege 16, 17 gedrückt werden kann.In the embodiment of FIG. 2, the edge region of the fabric 23 is placed on the inside of the lower surface 13 of the frame profile 12 via the webs 16, 17 and fixed there by means of a clamping bar 24 'pressed from above. When pressing on the terminal strip 18 'via the webs 16, 17, the material of the clothing 23 is tensioned on the underside of the frame 11 at the same time. For the clamping bars 24 and 24 'in Figs. 1 and 2, a uniform U-profile is preferably used, the outer width is designed so that it can be pressed with the interposition of the edge of the fabric 23 in a press fit into the groove 20 and the inner width is dimensioned so that it can be pressed with the interposition of the covering 23 in the press fit on the webs 16, 17.
Falls erforderlich kann sowohl eine Bespannung 23 an der Unterseite (beispielsweise gemäß Fig. 1) als auch eine Bespannung an der Oberseite des Rahmens 11 (beispielsweise gemäß Fig. 2) vorgesehen sein. Dabei kann die untere Bespannung 23 gemäß Fig. 2 durch Aufpressen der Klemmleiste 24' über die Stege 16, 17 befestigt werden und die Befestigung einer nicht gezeigten oberen Bespannung kann durch Einpressen der Klemmleiste 24 in die Nut 20 erfolgen. Es kann jedoch auch eine den Rahmen vollständig umgebende Bespannung 23 durch Überlappung der Randbereiche und gemeinsames Einpressen in die Nut 20 fixiert werden.If necessary, both a covering 23 on the underside (for example according to FIG. 1) and a covering on the upper side of the frame 11 (for example according to FIG. 2) may be provided. In this case, the lower fabric 23 as shown in FIG. 2 by pressing the terminal strip 24 'via the webs 16, 17 are fastened and the attachment of a top fabric not shown can be done by pressing the terminal block 24 in the groove 20. It however, a covering 23 completely surrounding the frame can also be fixed in the groove 20 by overlapping the edge regions and pressing them together.
Erforderlichenfalls können die Außenseiten der Stege 16, 17, die Seitenwände 22 der Nut 20 und/oder die Innen- und/oder Außenwände der Klemmleiste 24 bzw. 24' mit zusätzlichen Vertiefungen oder Vorsprüngen bzw. Verzahnungen versehen sein, um die Klemmkraft zu erhöhen.If necessary, the outer sides of the webs 16, 17, the side walls 22 of the groove 20 and / or the inner and / or outer walls of the clamping bar 24 or 24 'may be provided with additional recesses or projections or teeth to increase the clamping force.
Bei der Verwendung des Rahmens 11 bei einem Schallabsorber 10, der an einer Wand oder einer Decke eines Raumes befestigt wird, genügt das Vorsehen einer Bespannung 23 an der dem Raum zugewandten Seite.When using the frame 11 in a sound absorber 10, which is attached to a wall or a ceiling of a room, the provision of a covering 23 on the side facing the room is sufficient.
Die Stege 16, 17 und die Unterseite des Nutgrunds 21 dienen auch als Halterung bzw. Auflage für einen oberen bzw. einen unteren flächigen dünnen Träger 25 bzw. 26, zwischen denen ein Absorptionsmaterial 27, beispielsweise aus Glasfi- lamenten hergestellte Glasfilamentgarne bzw. aus Glasfilamentgarnen hergestellte Gewebe in loser Form oder in Form eines vorgefertigten Teils wie z. B. eines Kissens oder einer Matte aufgenommen ist.The webs 16, 17 and the underside of the groove base 21 also serve as a support or support for an upper or a lower flat thin carrier 25 and 26, between which an absorbent material 27, for example, glass filament yarns made of glass filaments or of glass filament yarns fabric produced in bulk or in the form of a prefabricated part such. B. a pillow or a mat is added.
Die Stege 16, 17 (in Fig. 1) beziehungsweise die Oberseite der Klemmleiste 24' (in Fig. 2) sorgen dabei gleichzeitig für einen für die Schalldämmung vorteilhaften Luftspalt 28 zwischen der Abdeckung 16 und dem Absorptionsmaterial 27.The webs 16, 17 (in FIG. 1) or the upper side of the clamping strip 24 '(in FIG. 2) simultaneously ensure an air gap 28, which is advantageous for the sound insulation, between the cover 16 and the absorption material 27.
Die Abdeckung bzw. Bespannung 23 des Schallabsorbers 10 besteht aus einem permanent schwer entflammbaren und nicht brennbaren Material gemäß DIN 4102 - A2. Sowohl von der Einhaltung der Brandschutzvorschriften als auch von der Funktionalität für Schallschutzzwecke hat sich ein zumindest zum überwiegenden Teil aus Glasfasern oder Glasfilamentgarnen oder Rovings bestehen- des Gewebe als bestens geeignet erwiesen. Ein derartiges Gewebe weist im Übrigen eine hervorragende Haltbarkeit auf, ist unempfindlich gegen Feuchtigkeit und Verschmutzung und kann bei Bedarf auch leicht gereinigt werden. Der in den Fig. 3 und 4 dargestellte Schallabsorber 10 weist beispielsweise die Form eines flachen Kissens oder einer Matte in Rechteckform auf und enthält das voranstehend beschriebene Absorptionsmaterial 27, das bevorzugt aus Glasfila- menten hergestellte Glasfilamentgarne wie E-Glasgarn bzw. aus Glasfilament- garnen hergestellte Gewebe enthält, wobei aus schalltechnischen Gründen auch ein Anteil von Mineralwolle enthalten sein kann.The cover or covering 23 of the sound absorber 10 consists of a permanently flame retardant and non-flammable material according to DIN 4102 - A2. Both from the observance of the fire protection regulations as well as the functionality for soundproofing purposes, a tissue consisting at least predominantly of glass fibers or glass filament yarns or rovings has proven to be highly suitable. Incidentally, such a fabric has excellent durability, is insensitive to moisture and soiling, and can be easily cleaned if necessary. The sound absorber 10 shown in FIGS. 3 and 4 has, for example, the shape of a flat pad or a mat in a rectangular shape and contains the absorption material 27 described above, the glass filament yarns preferably made of glass filaments such as E glass yarn or glass filament yarns contains tissue produced, and for sound technical reasons, a proportion of mineral wool may be included.
Eine Umhüllung 29 oder ein Überzug umgibt das Absorptionsmaterial 27 vollständig. Die Umhüllung 29 bzw. der Überzug ist beispielsweise aus einem nicht- brennbaren Glasgarngewebe nach DIN 4102 - A2 gebildet. Mehrere sich insbesondere rechtwinklig kreuzende Steppnähte 30 unterteilen je nach Erfordernis die gesamte Fläche des Schallabsorbers 10 in einzelne kleinere Bereiche oder Kammern 31 (im Beispiel zwölf Kammern 31), in denen das Absorptionsmaterial 27 durch die Steppnähte 30 ortsfest und verschiebesicher gehalten ist. An jeder Umfangsseite kann eine Randnaht 32 die obere Umhüllung 29 und die untere Umhüllung 29 verbinden (falls diese nicht taschenartig gebildet sind) und sie kann je nach Erfordernis einen randseitigen Wulst oder dergleichen aus der Umhüllung 29 bilden. Dieser Schallabsorber 10 kann als Einlage oder als Auflage auf Tragkonstruktionen in offenen oder geschlossenen Räumen in beliebigen Größen, Dicken und Formen gebildet werden, wie z. B. viereckig, dreieckig oder rund sowie als Platte oder zylindrisch.A wrap 29 or coating completely surrounds the absorbent material 27. The coating 29 or the coating is formed for example from a non-combustible glass fiber fabric according to DIN 4102 - A2. Several stitching seams 30, which in particular cross each other at a right angle, subdivide the entire surface of the sound absorber 10 into individual smaller areas or chambers 31 (twelve chambers 31 in the example), in which the absorption material 27 is held stationary and non-displaceable by the stitching seams. On each circumferential side, an edge seam 32 may join the upper wrap 29 and the lower wrap 29 (if they are not pocketed) and may form a rim bead or the like from the wrap 29 as required. This sound absorber 10 may be formed as a deposit or as a support on supporting structures in open or closed spaces in any size, thickness and shape, such. B. square, triangular or round and as a plate or cylindrical.
An einem erfindungsgemäßen Schallabsorber mit E-Glasgarn als Absorptionsmaterial wurden Messungen vorgenommen. Die Messkurve des ermittelten Schall- absorptionsgrades lag insbesondere in einem Bereich von etwa 300 Hz bis etwa 1300 Hz deutlich über einer Referenzkurve (verschobene Bezugskurve nach ISO 11654) von Glaswolle. BezugszeichenlisteMeasurements were made on a sound absorber according to the invention with E glass yarn as absorption material. The measured curve of the determined sound absorption level was clearly above a reference curve (shifted reference curve according to ISO 11654) of glass wool, in particular in a range from about 300 Hz to about 1300 Hz. LIST OF REFERENCE NUMBERS
Schallabsorber 22 NutseitenwandSound absorber 22 groove sidewall
Rahmen 23 BespannungFrame 23 stringing
Rahmenprofil 24 Klemmleiste untere Fläche 24' Klemmleiste vertikale Wand 25 Träger obere Fläche 26 TrägerFrame profile 24 Terminal strip lower surface 24 'Terminal strip vertical wall 25 Carrier upper surface 26 Carrier
Steg 27 AbsorptionsmaterialBridge 27 absorption material
Steg 28 LuftspaltBridge 28 air gap
Steg 29 UmhüllungBridge 29 serving
Steg 30 SteppnahtBridge 30 stitching
Nut 31 KammerGroove 31 chamber
Nutgrund 32 Randnaht Groove 32 edge seam

Claims

Patentansprüche claims
1. Schallabsorber mit einem Absorptionsmaterial zum Absorbieren von Raumschall, dadurch gekennzeichnet, dass das Absorptionsmaterial (27) aus aus Glasfilamenten hergestelltenSound absorber with an absorption material for absorbing room sound, characterized in that the absorption material (27) made of glass filaments
Glasfilamentgarnen oder Rovings oder aus aus Glasfilamentgarnen hergestelltem Glasfilamentgewebe gebildet ist.Glass filament yarns or rovings or glass filament fabric made of glass filament yarns.
2. Schallabsorber nach Anspruch 1 , dadurch gekennzeichnet, dass bei der Herstellung und/oder der Verarbeitung des Glasfilamentgewebes anfallender Webkantenabfall das Absorptionsmaterial (27) bildet.2. Sound absorber according to claim 1, characterized in that in the production and / or processing of the glass filament fabric resulting Webkantenabfall forms the absorbent material (27).
3. Schallabsorber nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Glasfilamentgarne Durchmesser im Bereich von 0,01 mm bis 3,0 mm und insbesondere von 0,2 mm bis 0,5 mm aufweisen.3. Sound absorber according to claim 1 or 2, characterized in that the glass filament yarns have diameters in the range of 0.01 mm to 3.0 mm and in particular from 0.2 mm to 0.5 mm.
4. Schallabsorber nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass er als Kissen oder Matte gebildet ist.4. Sound absorber according to one of claims 1 to 3, characterized in that it is formed as a cushion or mat.
5. Schallabsorber nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Absorptionsmaterial zumindest teilweise von einer Umhüllung (29) umgeben ist.5. Sound absorber according to one of claims 1 to 4, characterized in that the absorption material is at least partially surrounded by a sheath (29).
6. Schallabsorber nach Anspruch 5, dadurch gekennzeichnet, dass die Umhüllung (29) aus einem nicht- brennbaren Glasgarngewebe besteht. 6. Sound absorber according to claim 5, characterized in that the sheath (29) consists of a non-combustible glass fiber fabric.
7. Schallabsorber nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass zumindest eine Steppnaht (30) das Absorptionsmaterial (27) unterteilt.7. Sound absorber according to claim 5 or 6, characterized in that at least one stitching seam (30) subdivides the absorption material (27).
8. Schallabsorber nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass er einen Rahmen (11) aufweist, in dem das Absorptionsmateriai (27) aufgenommen ist.8. Sound absorber according to one of claims 1 to 7, characterized in that it comprises a frame (11) in which the Absorptionsmateriai (27) is received.
9. Schallabsorber nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass das Absorptionsmaterial (27) zwischen zwei am Rahmen (11) gehaltenen Trägerflächen (25), insbesondere Metallgitter, aufgenommen ist.9. Sound absorber according to one of claims 1 to 8, characterized in that the absorption material (27) between two on the frame (11) held support surfaces (25), in particular metal mesh, is added.
10. Schallabsorber nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass der Rahmen (11) mit dem Absorptionsmaterial (27) sichtseitig von einer Bespannung (23) abgedeckt ist.10. Sound absorber according to claim 8 or 9, characterized in that the frame (11) with the absorption material (27) on the visible side of a covering (23) is covered.
11. Schallabsorber nach Anspruch 10, dadurch gekennzeichnet, dass die Bespannung (23) innerhalb des Rahmens (11) angeordnet ist und das Absorptionsmaterial (27) bzw. die Trägerfläche (25) abdeckt. 11. Sound absorber according to claim 10, characterized in that the covering (23) is arranged within the frame (11) and covers the absorption material (27) or the support surface (25).
EP08784840.4A 2007-07-17 2008-07-17 Sound absorber Active EP2181226B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710033613 DE102007033613A1 (en) 2007-07-17 2007-07-17 sound absorber
PCT/EP2008/005859 WO2009010292A2 (en) 2007-07-17 2008-07-17 Sound absorber

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EP2181226B1 EP2181226B1 (en) 2016-02-17

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DE202010000767U1 (en) 2010-01-09 2010-06-24 Weber, Gabriele Cavity container for sound absorption
FR2981102A1 (en) * 2011-10-11 2013-04-12 Jean Marc Scherrer FALSE WALL REMOVABLE PANEL REHABILITATION DEVICE
FR2984933B1 (en) * 2011-12-23 2021-06-25 Normalu SMOOTH FOR FALSE WALL FRAME, ESPECIALLY FALSE CEILING.
GB2531482A (en) * 2016-02-09 2016-04-20 Jbh Soft Furnishings Ltd Acoustic damping panel system
FR3096629A1 (en) * 2019-05-28 2020-12-04 Treves Products, Services & Innovation Capping body intended to be placed in a motor vehicle body cavity
AT521790B1 (en) 2019-06-03 2020-07-15 Herbert Auberger Sound absorber element with a clamping frame enclosing an insulating material

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CH191478A (en) * 1935-09-18 1937-06-30 Hugo Dr Stoessel Sound-insulating mat for wall and ceiling constructions.
US2477555A (en) 1944-08-18 1949-07-26 Owens Corning Fiberglass Corp Mineral fiber mat and process of manufacture
CH679940A5 (en) 1989-04-27 1992-05-15 Matec Holding Composite material for rigid sound insulation car interior - consists of resin-bonded random fibre mat core with porous substrate and pref. reinforced with smc.
DE19506120A1 (en) * 1995-02-22 1996-08-29 Qaiser Yazdani Ceramic or plastic noise absorption building block or tile
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EP2181226B1 (en) 2016-02-17
WO2009010292A3 (en) 2009-04-02

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