EP3070217A1 - Schallabsorbierende anordnung - Google Patents

Schallabsorbierende anordnung Download PDF

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Publication number
EP3070217A1
EP3070217A1 EP15160097.0A EP15160097A EP3070217A1 EP 3070217 A1 EP3070217 A1 EP 3070217A1 EP 15160097 A EP15160097 A EP 15160097A EP 3070217 A1 EP3070217 A1 EP 3070217A1
Authority
EP
European Patent Office
Prior art keywords
top layer
support plate
range
sound absorbing
absorbing assembly
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Withdrawn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
EP15160097.0A
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English (en)
French (fr)
Inventor
Kristoff Dries Koen Ver Eecke
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.)
Triplaco Nv
Original Assignee
Triplaco Nv
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 Triplaco Nv filed Critical Triplaco Nv
Priority to EP15160097.0A priority Critical patent/EP3070217A1/de
Publication of EP3070217A1 publication Critical patent/EP3070217A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling
    • E04B2001/848—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element
    • 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
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling
    • E04B2001/848—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element
    • E04B2001/8485—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element the opening being restricted, e.g. forming Helmoltz resonators

Definitions

  • the present invention generally relates to a sound absorbing assembly and a method of manufacturing such a sound absorbing assembly. More specifically it relates to sound absorbing assemblies for use as for example plate shaped constructional elements, also referred to as building panels, ceiling panels, wall panels, partition panels etc.
  • Such a sound absorbing assembly is for example known from DE19839973 . It discloses a sound absorbing assembly for use as a plate-shaped constructional element.
  • the sound absorbing assembly comprises a support plate structure formed by a perforated plate approximately 6 to 30 mm thick made of a solid material such as metal, wood, wood chip board, Medium Density Fibreboard, pressboard, synthetic material or gypsum.
  • This support plate structure comprises a pattern of support plate holes or a grating having a hole area fraction of 10-90%.
  • the support plate holes in the support plate structure are relatively large, for example in the range of 2mm to 30mm.
  • the sound absorbing assembly further comprises a micro-perforated sheet or thin plate disposed on one of the plate surfaces of the support plate structure.
  • the micro-perforated sheet or thin plate comprises micro-holes having diameters smaller than 2 mm and a hole area fraction smaller than 4% of the total area. It is known from DE19839973 that the support plate holes and micro-holes cooperate to form a Helmholtz resonator structure.
  • DE19839973 teaches that, when using a non-woven material or tissue with a suitable flow resistance as a porous layer placed or stretched on one side of the perforated support plate structure with the large support plate holes, as shown in Figure 4 of DE19839973 . According to DE19839973 this presents the disadvantage, that this non-woven material or tissues will be easily soiled when placed at the side facing of the room to be attenuated, and additionally the hole pattern and/or the frame of the support plate holes remains also visible. Therefore according to DE19839973 it is essential to make use of micro-perforated sheet, which is not made of a tissue or non-woven material on top of the support plate structure.
  • micro-perforated sheet which is for example manufactured as a high-pressure laminate or HPL, for example on top of a support plate structure manufactured as a medium-density fibreboard or MDF, even when provided with relatively small micro-perforations, in the form of holes or slots, leaves a regular and distinct repetitive pattern that is easily visible. Additionally drilling or milling holes or slots in such high quality materials is an operation that requires high performance and high precision tools in order not to cause damage to the area immediately surrounding the micro-perforations. This limits the efficiency and increases the cost of manufacturing such a sound absorbing assembly.
  • a manufacturing process for a sound absorbing assembly in which a porous fabric is glued on top of rigid panel body with apertures.
  • the pores of the fabric being substantially smaller than the apertures in the panel body.
  • the glue is applied by means of a nozzle in a convoluting pattern surrounding these apertures.
  • a sound absorbing assembly comprising:
  • micro-perforated sheet or thin plate comprises micro-holes as top layer.
  • the pores of the woven fabric provide for an optimized Helmholtz-resonator like effect.
  • the more irregular structure of the woven fabric and its yarns, when compared to a planar micro-perforated sheet provides for a more optimized dispersion and attenuation of the sound pressure waves.
  • the visual appearance of the sound absorbing panel is improved as the pores of the woven top layer do not result in a distinctive repetitive pattern, and this specific range for the woven top layer thickness ensures that the support plate openings and/or the frame of the support plate are no longer clearly visible when the sound absorbing assembly is mounted to a wall, ceiling or other suitable surface of a room. Similar advantages could also be achieved by means of knitted fabric top layer with the same range for the ratio of the knitted fabric top layer thickness with respect to the support plate thickness.
  • a sound absorbing assembly characterised in that:
  • the Helmholtz resonator like effect of the support plate and the woven top layer is further optimized leading to optimized sound attenuation values.
  • a knitted top layer with a knitted top layer thickness of the fabric top layer in the range of 1/8 to 1/10 of the support plate thickness could be provided.
  • a sound absorbing assembly characterised in that the woven fabric top layer comprises yarns with a thickness in the range of 50% to 120%, preferably 80% to 100% of the woven top layer thickness.
  • a suitable the woven fabric top layer will comprise a suitable percentage of holes and sufficient undulation at the level of the warp yarns and weft yarns in order to achieve an improved sound attenuation effect. It is clear that with thickness of the yarn of the woven fabric top layer, there is referred to the dimension of the cross section of the yarn. For example in the case of a mono-filament yarn with a circular cross-section the thickness of the yarn refers to the diameter of the yarn.
  • the cross-section of the yarn has an alternative cross section, such that, when woven into the woven fabric of the woven fabric top layer the size of the cross-section of the yarn along the direction transverse to the plane of the woven fabric diverges considerably of the size of this cross section along the direction of the plan of the woven fabric, the thickness of the yarn refers to the size of the cross-section of the yarn generally transvers to the plane of the woven fabric.
  • a knitted fabric top layer could be provided and preferably the yarns have a similar ratio for their thickness with respect to the knitted top layer thickness as similarly as with a woven fabric then a suitable percentage of holes and sufficient undulation at the level of the knitted yarns in order to achieve an improved sound attenuation effect.
  • a sound absorbing assembly characterised in that the yarns comprise a mono-filament yarn.
  • the yarns comprise a mono-filament yarn.
  • Such mono-filament yarns ensure a good structural stability for the woven fabric top layer and additionally ensure an optimal percentage of holes and sufficient undulation at the level of the warp yarns and weft yarns in order to achieve a sound attenuation effect.
  • a sound absorbing assembly characterised in that the yarns, comprise one or more of the following:
  • Suitable spun or filament natural or synthetic yarns such as for example multi-filament synthetic yarns, multi-filament glass fibre yarns, cotton yarns, wool yarns, etc. are possible, the specific yarns mentioned above allow for a sound absorbing assembly comprising a top layer that has an excellent product stability, a good moisture resistance , a good impact resistance, is scratch proof, shock proof, washable, etc. is realized comprising a simple and robust structure and improved sound absorbing parameters.
  • a sound absorbing assembly characterised in that the woven top layer comprises a percentage of holes in the range of 0,5% to 7%, preferably in the range of 1 % to 5%.
  • a sound absorbing assembly characterised in that the woven top layer comprises a weaving pattern comprising a density in the range of 5 to 12, preferably 6 to 10, warp yarns and or weft yarns per centimetre.
  • a simple and robust woven top layer can be realized that contributes to optimal acoustic properties of the sound absorbing assembly as it comprises a sufficient percentage of holes and a sufficient level of undulations of the yarns.
  • a sound absorbing assembly characterised in that the sound absorbing assembly further comprises a wall cavity layer in between the wall facing planar side of the support plate and the wall, when mounted, the wall cavity layer thickness being in the range of 15mm to 70mm, preferably in the range of 18mm to 55mm.
  • This wall cavity allows for an optimal amount of further sound damping material to be placed in between the wall facing planar side of the support plate and the wall.
  • a sound absorbing assembly characterised in that the wall cavity layer comprises one or more of the following:
  • a sound absorbing assembly comprising a Weighted Sound Absorption Coefficient in accordance with the ISO 11654 standard, also referred to as Alpha-W, of 0,7 or more, or even 0,9 or more can be realized for a sound absorbing assembly with a limited support plate thickness of only for example 8mm.
  • synthetic wool or foam preferably allows to apply it already to the wall facing side of the sound absorbing assembly during manufacturing, which allows for a more efficient mounting operation.
  • a sound absorbing assembly characterised in that the sound absorbing assembly further comprises a backing layer, the backing layer thickness being in the range of 0,1mm to 5mm, preferably in the range of 0,2mm to 2mm.
  • a sound absorbing assembly characterised in that the backing layer comprises a non-woven tissue, preferably a non-woven tissue comprising glass fibres with a weight in the range of 50g/m 2 to 75g/m 2 and a fibre diameter in the range of 7 ⁇ m to 15 ⁇ m.
  • Such a non-wove tissue can perform its acoustic function at the wall facing side of the support plate where it is no longer visible and where it can be easily applied.
  • a sound absorbing assembly characterised in that the woven fabric top layer which is directly glued to the room facing planar side of the support plate by means of a glue layer of which the glue layer thickness is in the range of 10% to 30% of the woven top layer thickness.
  • a sound absorbing assembly characterised in that the sound absorbing assembly further comprises mounting a mounting frame arranged between the wall facing planar side of the support plate, and in that the support plate is mounted to the mounting frame by means of nails:
  • the sound absorbing assembly can be mounted to a support frame efficiently with the risk for damaging the woven fabric top layer and without leaving any visual traces as the head of the nail will visually disappear in between and/or below the yarns of woven fabric.
  • Such nails can be for example mounted by means of a suitable air pressurized gun in order to allow for an efficient and consistent mounting of the nails.
  • alternative mounting systems or combinations of mounting systems might be possible, preferably with minimal or without leaving visual traces of the mounting means or of any connection means in between neighbouring sound absorbing panels, such as for example one or more of the following:
  • a method of manufacturing the sound absorbing assembly according to the first aspect of the invention characterised in that the method comprises the sequential steps of:
  • the improved sound absorbing assembly can be manufactured by means of a simple and efficient glue application process.
  • the glue layer preferably comprises a pressure-setting, Polyurethane glue.
  • FIG. 1 schematically illustrates a cross section of an embodiment of a sound absorbing assembly 10.
  • the sound absorbing assembly comprises a support plate 30.
  • the support plate 30 is provided with a large number of support plate openings 33 and can thus generally be referred to as a perforated plate.
  • a suitable material from which such a perforated support plate 30 can be manufactured is for example a medium-density fibreboard plate or MDF plate provided with a plurality of support plate openings 33. It is clear that other suitable materials for manufacturing such a perforated support plate are possible, such as for example a suitable gypsum plate provided with a plurality of support plate openings 33, which is preferable over an MDF or alternative wood based plate because of improved fire resistant properties.
  • the support plate 30 comprises a support plate thickness 32 of for example 8mm. It is clear that the support plate thickness 32 of the support plate 30 is the distance between its room facing planar side 35 and its opposing, wall facing planar side 37. It is clear that according to alternative embodiments alternative support plate thickness could be used as long as in general it is in the range of 5mm to 30mm, and preferably in the range of 6mm to 12mm. These ranges allow for a Helmholtz-resonator like effect as will be explained in more detail below.
  • the embodiment of the support panel of Figure 1 comprises a plurality of support plate openings 33.
  • these support plate openings 33 extend through the support plate 30 from its room facing planar side 35 to its wall facing planar side 37.
  • the plurality of support plate openings comprising have cylindrical shape with a diameter 34 of 6mm.
  • alternative shapes to the cylindrical shape are possible, such as for example suitable slots with a width of 6mm, conically drilled or milled shapes, etc.
  • the apertures etc. as long as in general the opening width 34 of these support plate openings 33, this means the diameter in case of a cylindrical opening or the width in the case of a longitudinal slot shaped opening, is in the range of 4mm to 12mm.
  • the centre-to-centre distance 36 this means the distance between the central longitudinal axes of two adjacent cylindrical support plate openings 33 is 8mm. It is clear that in this way a sufficient wall thickness for the structural walls 31 of the support plate 30 in between the support plate openings 33 is achieved. However it is clear that alternative embodiments are possible, as long as in general the centre-to-centre distance 36 is in the range of 110% to 500% of the opening width 34.
  • the plurality of support plate openings 33 can for example be provided by means of a triangular, square or other suitable drilling pattern for 6mm diameter holes through the support plate 30 with a centre-to-centre distance 36, sometimes also referred to as a hole-centre distance or an opening centre distance of 8mm. It is clear that, although only an enlarged part of the section of the sound absorbing panel 10 is shown, the length and width of this sound absorbing panel 10 is several orders of magnitude larger than the opening width 34 of its support plate openings 33 and thus a large number of for example 6mm diameter support plate openings 33 are provided in a sound absorbing panel 10 with a width and length of for example larger than 1 m.
  • gypsum type support plates for example of the type generally known as Gyptone or Rigitone, which for example comprise a gypsum plate with dimensions of length x width x thickness of about 1998 x 1188 x 12,5mm, comprises circular support plate openings 33 of for example respectively 6mm, 8mm or 10mm, and a centre-to-centre distance 36 of respectively 18mm, 18mm or 23 mm for respectively the types referred to as Rigitone 6/18, Rigitone 8/18 or Rigitone 10/23.
  • These support plate openings 33 are arranged in a square drilling pattern, thereby respectively leading to an opening degree of 8,7%; 15,5% or 14,8% respectively.
  • alternative embodiments comprising alternative dimensions are possible with respect to the length, width, thickness and the size of the openings of the plate.
  • the length x width could for example be 3030mmx1280mm.
  • a woven fabric top layer 20 is directly glued to the room facing planar side 35 of the support plate 30.
  • this woven fabric top layer 20 consists of a woven fabric.
  • the woven fabric top layer 20 thus comprises only a woven fabric a simple and efficient construction and manufacturing of the sound absorbing assembly 10 can be realised.
  • the woven top layer thickness 22 of the woven top layer 20 is 1 mm.
  • the woven top layer thickness 22 is in the range of 1/7 to 1/12 of the support plate thickness 32.
  • the combination of the specific support plate openings 33 and the porosity of the woven top layer 20 as well as this specific ratio the thickness of the woven top layer in relation to the support plate will provide for an optimal Helmholtz-resonator like effect, while the undulating structure of the woven fabric of the woven fabric top layer 20, as well as the more or less round circumferential shape of the yarns of the woven fabric enhance dispersion, attenuation and absorption of sound pressure waves.
  • Figure 2 shows a top view of an embodiment of the woven fabric top layer 20 in more detail.
  • the woven fabric top layer 20 comprises a simple 1 by 1 basket weave weaving pattern of warp yarns 24 and weft yarns 26.
  • suitable openings 28 are created in between these respective yarns 24, 26 of the woven fabric top layer 20.
  • the yarns 24, 26 are yarns comprising a mono-filament glass fibre core and at least one polyvinyl chloride coating, for example a coextruded PVC coating could be chosen.
  • Alternatives embodiments of the yarn are possible such as for example a mono-filament polyvinylchloride or polyester yarn, or other suitable filament polymer yarn.
  • the yarn could for example be filament glass fibre yarn.
  • any suitable filament or spun yarn and/or synthetic or natural yarn could be used such the mono-filament yarn mentioned above are preferable as they also provide for good mechanical properties 10 when used as woven fabric top layer 20, such as an increased resistance to scratches, shocks, a good impact resistance, is moisture resistant, and allows for easy and efficient cleaning of the woven fabric top layer of the sound absorbing assembly when soiled.
  • the diameter 24D, as more clearly shown in Figure 3 of the yarn 24 is 0,5mm, which is approximately equal to 50% of the thickness 22 of the woven top layer 20.
  • weaving pattern is possible such as for example a 2/2 basket weave, or any other suitable weaving pattern that can be defined for particular shed forming device of the weaving machine, that for example makes use of a suitable weaving frames or even more complicated patterns making use of for example a jacquard type shedding device.
  • the woven top layer 20 comprises a weaving pattern comprising a density in the range of 5 to 12, preferably 6 to 10, warp yarns 24 and or weft yarns 26 per centimetre.
  • a weaving pattern comprising a density in the range of 5 to 12, preferably 6 to 10, warp yarns 24 and or weft yarns 26 per centimetre.
  • Chocolate there are provided 8 warp yarns and 8 weft yarns per centimetre in a 2/2 basket weave pattern.
  • Sepia there are provided 6 warp threads per centimetre and 10 weft threads per centimetre.
  • the specific yarns used in these embodiments referred to as "Chocolate” and “Sepia” are mono-filament yarns comprising a glass fibre core and a co-extruded polyvinyl chloride dual colour coating with a diameter of 0,5mm.
  • such a woven top layer 20 are possible, for example comprising a percentage of holes in the range of 0,5% to 7%, preferably in the range of 1 % to 5%. As shown in more detail in Figure 3 , the percentage of holes is determined largely by the ratio between the diameter 24D of the yarns 24, 26, the diameter or width 28D of the openings 28 in between the yarns 24, 26, the weaving pattern and the respective density of warp yarns and weft yarns.
  • a suitable percentage of holes and a suitable level of undulation of the yarns 24, 26 of the woven top layer 20 can generally be achieved when the woven fabric top layer 20 comprises yarns 24, 26 with a thickness 24T in the range of 30% to 120% of the woven top layer thickness 22.
  • the woven top layer thickness 22 is 1 mm and the thickness 24T of the yarns 24, 26, which according to this embodiment corresponds to the diameter 24D of the circular cross section of the yarns 24, 26, is 0,5 mm thereby corresponding to a ratio of 50%.
  • the thickness 24T of the yarn 24, 26 generally refers to the size of the cross-section of the yarn 24, 26 generally transvers to the plane of the woven fabric 20.
  • the woven fabric 20 would comprise yarns 24, 26 with a non-circular cross section, such as for example a cross section resembling more a square, ellipsis, etc. the thickness 24T of the yarn 24, 26 of the woven fabric 20 will generally be determined by the maximum size of the cross section of the yarn along the direction generally transvers to the plane of the woven fabric 20.
  • the thickness of the glue layer should be sufficiently large to allow for a secure connection between the undulating yarns of the woven top layer 20 and the room facing surface 35 of the support plate 30.
  • a polyurethane glue of the type referred to as PUR 706.1 as produced by KebChemie M.G. Becker GmbH under the tradename KLEIBERIT. It comprises a Polyurethane basis, a density of 1,1g/cm 3 and is of the pressure setting type, which cures when a sufficiently large amount of pressure is applied. According to this embodiment it is applied at a rate of 80g/m 2 .
  • the glue layer 100 are possible as long as preferably the woven fabric top layer 20 is directly glued to the room facing planar side 35 of the support plate 30 by means of this glue layer 100 of which the glue layer thickness 100D is in the range of 10% to 30% of the woven top layer thickness 22. As clearly shown in Figure 3 , this allow the glue layer to cover a substantial part of the undulating yarns 24, 26 when they are nearest to the room facing planar side 35 of the support plate 30, while still leaving the diameter 28D of the openings 28 unchanged.
  • the sound absorbing assembly 10 further also comprises a backing layer 40.
  • the backing layer 40 comprises a backing layer thickness 42 being in the range of 0,1 mm to 5mm, preferably in the range of 0,2mm to 2mm.
  • the backing layer 40 according to this embodiment comprises for example a non-woven tissue, preferably a non-woven tissue comprising glass fibres with a weight in the range of 50g/m 2 to 75g/m 2 and a fibre diameter in the range of 7 ⁇ m to 15 ⁇ m.
  • the sound absorbing assembly 10 further comprises a wall cavity layer 50 in between the wall facing planar side 37 of the support plate 30 and the wall 60 when mounted.
  • a wall cavity layer 50 in between the wall facing planar side 37 of the support plate 30 and the wall 60 when mounted.
  • wall is to be interpreted broadly, as any suitable surface to which the sound absorbing assembly could be mounted, such as for example any suitable surface of a room, for example its walls, ceiling, floor, etc.
  • the wall cavity layer thickness 52 being in the range of 15mm to 70mm, preferably in the range of 18mm to 55mm.
  • the wall cavity layer 50 has a thickness 52 of 50mm and is filled with mineral wool.
  • wall cavity layer 50 has a thickness 52 of 20mm and is filled with a synthetic wool or a synthetic foam, which preferably has already been provided to the wall facing planar side 37 of the support plate 30 during manufacturing and before the mounting operation.
  • a synthetic wool could for example comprise a suitable polymer wool, such as for example a polyester wool with a density in the range of 300g/m 2 to 750g/m 2 .
  • a suitable synthetic foam could for example comprise a foam comprising melamine, polyethylene, poly-urethane, etc. It is clear that although preferably the wall cavity layer 50 is completely filled with such a mineral or synthetic wool or a synthetic foam, in general alternative embodiments are possible in which for example the wall cavity layer 50 is only partly filled with such materials.
  • the sound absorbing assembly 10 further also comprises a mounting frame 70, arranged between the wall facing planar side 37 of the support plate 30 and the wall 60 when mounted.
  • the support plate 30, as shown, is mounted to the mounting frame by means of suitable nails 72.
  • these nails 72 have a head size that lower than 150% of thickness 24D of the yarns 24, 26 of the woven fabric top layer 20.
  • the nails 72 are inserted, for example by means of hammering or a suitable air-gun, such that the nails 72 project from the room facing planar side 35 over a distance that is smaller than 80%, preferably smaller than 60%, of the woven top layer thickness 22.
  • the nails 72 are no longer visible.
  • the nails 72 penetrate the fabric top layer 20 and preferably even penetrate beyond the room facing planar side 35 into the support plate 30 with their head, as this still further reduces the risk for visibility of the nails.
  • the sound absorbing assembly 10 can be mounted to the mounting frame 70 from its room facing side without causing damage or leaving visual traces of the mounting means.
  • Figures 5 and 6 respectively shows a table and graphic representation of sound absorption values of specific embodiments of the sound absorbing assembly 10 very similar to the embodiment described with reference to Figure 1 , which preferably have the support plate thickness 32 in the range of 6mm to 12mm; and a woven top layer thickness 22 of the woven top layer 20 is in the range of 1/8 to 1/10 of the support plate thickness 32.
  • the left column A labelled 200, of Sound Absorption Coefficients or Alpha-s in Figure 5 and the corresponding chart with diamond shaped reference points in Figure 6 , relates to an embodiment with a woven top layer thickness 22 of 1 mm of the "Sepia" embodiment of the fabric referenced above, combined with a support plate thickness 32 of 8mm and a drilling pattern for the support plate openings with a diameter 34 for the openings 33 of 6mm and a centre-to-centre distance 36 of 8mm, comprising the MJ70B backing layer 40 referenced above and a wall cavity layer 50 with a thickness of 50mm filled with mineral wool.
  • this embodiment results in a Weighted Sound Absorption Coefficient in accordance with the ISO 11654 standard, also referred to as Alpha-W of 0,9.
  • a second embodiment is shown in the second column B, labelled 201, of Sound Absorption Coefficients or Alpha-s in Figure 5 and the corresponding chart with square shaped reference points in Figure 6 .
  • This embodiment is identical to the one related to column A, except that now an embodiment with a woven top layer thickness 22 of 1 mm of the "Chocolate" embodiment of the fabric referenced above is used. As shown this embodiment results in a Weighted Sound Absorption Coefficient in accordance with the ISO 11654 standard, also referred to as Alpha-W of 0,9.
  • a third comparative embodiment is shown in the third column C labelled 202 of Sound Absorption Coefficients or Alpha-s in Figure 5 and the corresponding chart with triangular shaped reference points in Figure 6 .
  • This embodiment is identical to the one related to column B, except that now instead of the non-woven MJ70B backing layer 40 a woven fabric is used as backing layer and the support plate has a support plate thickness 32 of 16mm.
  • this embodiment results in a Weighted Sound Absorption Coefficient in accordance with the ISO 11654 standard, also referred to as Alpha-W of 0,85. This corresponds to a ratio of the woven top layer thickness 22 of the woven top layer 20 of 1mm that is 1/16 of the support plate thickness 32 of 16mm.
  • the measured Alpha-W of 0,85 is surprisingly lower than the Alpha-W of 0,9 of the first and second embodiment described above which have a support plate thickness 32 of only 8mm, but do have a ratio with the optimal range of 1/7 to 1/12.
  • a fourth embodiment is shown in the fourth column D, labelled 203, of Sound Absorption Coefficients or Alpha-s in Figure 5 and the corresponding chart with cross shaped reference points in Figure 6 .
  • This embodiment is identical to the one related to column A, except that now an embodiment with a wall cavity layer 50 with a thickness of 20mm filled with polyester wool with a density in the range of 300g/m 2 to 750g/m 2 is used.
  • this embodiment results in a Weighted Sound Absorption Coefficient in accordance with the ISO 11654 standard, also referred to as Alpha-W of 0,6.
  • Alpha-W also referred to as Alpha-W of 0,6.
  • This is still a high Alpha-W value considering the limited thickness of the entire sound absorbing assembly being reduced to about 30mm, thereby reducing consumption of the volume at the circumferential walls of the room which is to be provided with such sound absorbing assemblies.
  • a fifth comparative embodiment is shown in the fifth column E of Sound Absorption Coefficients or Alpha-s in Figure 5 and the corresponding chart with dot shaped reference points in Figure 6 and labelled 204.
  • This embodiment is identical to the one related to column A, except that now an embodiment with a woven top layer thickness 22 of 0,57mm of an embodiment of the fabric sold under the trade name Alkenz Soleye Fabrics Sunshadow 3000 N 1%.
  • This woven top layer comprises a woven fabric comprising:
  • the sound absorbing assembly 10 can be manufactured by means of a simple and robust manufacturing process in which the woven fabric top layer 20 is glued to the room facing planar side 35 by means of an efficient roller coater.
  • First the glue layer 100 is applied by means of a glue application roller of the roller coater to the room facing planar side 35 of the support plate 30.
  • the glue layer thickness 100D is about 0,2mm when glue is applied at 80g/m 2 for a woven top layer thickness 22 of 1 mm.
  • the glue layer thickness 100D is in the range of 10% to 30% of the woven top layer thickness 22.
  • the woven fabric top layer 20 is placed on top of the glue layer 100 on the room facing planar side 35 of the support plate 30.
  • pressure rollers of the roller coater will temporary applying pressure by passing the support plate 30 with the applied glue layer 100 and the woven fabric top layer 20 placed thereon, between pressure rollers.
  • These pressure rollers will be positioned, such that the layer thickness is reduced by a thickness in the range of 50% to 90%, preferably in the range of 75% to 85%, of the woven top layer thickness 22 of the woven top layer 20.
  • a thickness in the range of 50% to 90% preferably in the range of 75% to 85%
  • the thickness is reduced by 8mm, or 80% of the woven top layer thickness 22.
  • the glue layer 100 will only be applied to the room facing plane 35 of the structural walls 31 of the support plate 30 by the glue application roller.
  • the glue layer 100 comprises a pressure-setting, Polyurethane glue.
  • Woven fabric in the context of this application refers to a textile formed by weaving that is produced on a loom by interweaving warp and weft threads.
  • mono-filament yarn in the context of this application, there is referred to a yarn comprising preferably a thick, single continuous and/or relatively long filament as opposed to spun yarns.
  • Mineral wool in the context of this application, is also known as mineral fibre, mineral fibre, stone wool, man-made mineral fibre or MMMF, and man-made vitreous fibre or MMVF, is a name for fibre materials that are formed by spinning or drawing molten minerals or synthetic minerals such as slag and ceramics.
  • a Weighted Sound Absorption Coefficient in the context of this description, this refers to a Weighted Sound Absorption Coefficient in accordance with the ISO 11654 standard, also referred to as Alpha-W.
  • the ISO 11654 standard describes how frequency dependent Sound Absorption Coefficients of octave bands of 250Hz to 4kHz are converted to a single number which is the Alpha-W value.
  • top, bottom, over, under, and the like are introduced for descriptive purposes and not necessarily to denote relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances and embodiments of the invention are capable of operating according to the present invention in other sequences, or in orientations different from the one(s) described or illustrated above.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
EP15160097.0A 2015-03-20 2015-03-20 Schallabsorbierende anordnung Withdrawn EP3070217A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15160097.0A EP3070217A1 (de) 2015-03-20 2015-03-20 Schallabsorbierende anordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15160097.0A EP3070217A1 (de) 2015-03-20 2015-03-20 Schallabsorbierende anordnung

Publications (1)

Publication Number Publication Date
EP3070217A1 true EP3070217A1 (de) 2016-09-21

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Family Applications (1)

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EP15160097.0A Withdrawn EP3070217A1 (de) 2015-03-20 2015-03-20 Schallabsorbierende anordnung

Country Status (1)

Country Link
EP (1) EP3070217A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB754252A (en) * 1953-05-18 1956-08-08 Fibrous Plaster Ceilings Propr Sheet material used for the acoustical treatment of buildings
DE19839973A1 (de) 1998-09-02 2000-03-23 Fraunhofer Ges Forschung Plattenförmiges Bauelement
DE202007004823U1 (de) * 2007-04-02 2007-08-02 Geipel, Udo Lochplattenanordnung zur Luftreinhaltung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB754252A (en) * 1953-05-18 1956-08-08 Fibrous Plaster Ceilings Propr Sheet material used for the acoustical treatment of buildings
DE19839973A1 (de) 1998-09-02 2000-03-23 Fraunhofer Ges Forschung Plattenförmiges Bauelement
DE202007004823U1 (de) * 2007-04-02 2007-08-02 Geipel, Udo Lochplattenanordnung zur Luftreinhaltung

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