• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a sound absorbent comprising a first cover layer (4), a second cover layer (6) and an intermediate layer (8), said intermediate layer (8) comprising walls (13) delimiting a plurality of cells (12,12a,12b,12c,12d) open in a first end (14) and a second end (16), said cells being arranged adjacent one another, said first open end (14) of said plurality of cells being covered by said first cover layer (4), said second open end (16) of said plurality of cells being covered by said second cover layer (6). In accordance with the invention, said first layer (4) is provided with at least one micro-slit (10) by mechanical machining, the micro-slit (10) extending through said first layer (4), such that sound waves are allowed to penetrate said micro-slit (10) and to enter the first open end (14) of said cell.
    公开号:SE1200253A1
    申请号:SE1200253
    申请日:2012-04-26
    公开日:2013-08-24
    发明作者:Ralf Corin
    申请人:Noisetech Hb；
    IPC主号:
    专利说明:

    SUMMARY OF THE INVENTION This object has been achieved with the initially described sound absorber, said first layer being provided with at least one micro-slot by mechanical processing, the micro-slot extending through said first layer so that sound waves are allowed to penetrate the micro-slot into the cell slot. first open end.
    This results in an effective sound absorber, which is cheaper to manufacture. The object has also been achieved with the initially described method, wherein said micro-slot is manufactured by means of mechanical machining with a mechanical tool.
    Preferably, the second layer is provided with at least one micro-slot so that sound waves are allowed to penetrate the micro-slot and penetrate into the other open end of the cell.
    Suitably the length of the micro-slot is in the range 2 mm - 2 km, more preferably 10 - 1000 mm, most preferably 100 - 1000 mm.
    Preferably the width of the slot is in the range 1 μm to 1 mm, more preferably 10 μm to 0.9 mm, most preferably 0.3 to 0.5 mm.
    Suitably the wall thickness is in the range 10 μm to 0.5 mm, more preferably 30 μm to 0.3 mm, most preferably 50 μm to 0.2 mm.
    Preferably, the walls are designed to form a plurality of cylinders of predetermined opening area and cross-section, each with a substantially constant cross-section. Above all, the cross section is essentially circular. Alternatively, the cross section is polygonal, such as substantially star-shaped. Alternatively, the cylinders have different cross-sectional areas.
    Such cylinders have a significant effect on the mechanical stability. Alternatively, or in addition, the walls are designed to form a plurality of cells of varying cross-section, such as a truncated cone or in the shape of an hourglass. This will expand the effective frequency range of the element.
    Preferably, at least every other blade is formed of a corrugated blade or plate, each other wall being a substantially flat blade or plate disposed between every other corrugated blade or plate.
    Suitably the thickness of the first layer and optionally the thickness of the second layer is in the range 10 μm to 5 mm, more preferably 20 μm to 0.9 mm, most preferably 50 μm to 0.6 mm.
    Preferably, said sheets are made of a cellulosic material, a polymeric material or metal. Suitably, said first layer is made of a cellulosic material, a polymeric material or metal. Preferably, said second layer is made of a cellulosic material, a polymeric material or metal.
    Examples of suitable cellulosic materials are paper, cardboard, veneer, wood, acetylcellulose, cellulose nonwoven, fibreboard, with or without surface treatment.
    Examples of suitable polymers are polyethylene (PE), polypropylene (PP), polyninyl chloride (PVC).
    Examples of suitable metals are aluminum and steel. The first layer can for aesthetic reasons be made of e.g. copper, silver or gold.
    Preferably, the thickness (te) of the intermediate layer is in the range 1 - 200 mm, more preferably 5 - 50 mm, most preferably 10 - 30 mm. The greater the thickness (tc), the better the low-frequency absorption.
    Preferably, the number of cells per square meter of the cross-section of the intermediate layer is 1 to 100,000,000, more preferably 100 to 1,000,000, most preferably 500 to 200,000. It should be noted that the higher the number per unit area, the better the sound absorption. According to the method, said micro-slot is manufactured by mechanical machining with a mechanical tool.
    Suitably the method comprises selecting a predetermined material for the intermediate layer, selecting a predetermined layer for the first layer and selecting a predetermined material for the second layer.
    Preferably, the first layer is connected, for example by gluing to the intermediate layer before the micro-slots are formed in the first layer. Likewise, the second layer is connected by gluing to the intermediate layer before the micro-slots are formed in the second layer. The adhesive contributes to mechanical stability and to vibration damping of the element.
    Conveniently, both the first layer and the second layer are connected by gluing to the intermediate layer before the micro-slots are formed in the first layer. This avoids handling problems of individual bearings in difficult cutting conditions.
    Preferably, the slot in the second layer is performed after both the first layer and the second layer have been connected to the intermediate layer, before the micro-slot is formed in the first layer.
    Suitably the mechanical machining includes punching, said mechanical tool being, for example, a punching knife. Alternatively, the mechanical processing includes slitting by means of a slitting machine, said mechanical tool being a knife. Alternatively, the mechanical machining includes cutting machining, said mechanical tool being a cutting steel with a cutting edge.
    Preferably, the method includes selecting a mechanical tool from a tool set to obtain a predetermined slot width, connecting said mechanical tool to a computer controlled numerical machine, and programming the slot length, slot depth and distance between the slots to obtain a predetermined sound attenuation.
    It should be noted that the mechanical processing method according to the invention excludes laser machining, cutting with cutting electrode, cutting with cutting torches and chemical processing, such as photoetching, as such methods can destroy parts of the cells, and will then have a negative impact on sound attenuation.
    SUMMARY OF FIGURES In the following, the invention will be described in further detail, with reference to the accompanying drawings, in which Fig. 1 illustrates in part in a cut-away view a sound absorber arranged with a first layer provided with micro-slots, a second layer and an intermediate layer; Fig. 2 is a cross-sectional view of a portion of the intermediate layer taken along the line shown in Fig. 1; Fig. 3 illustrates an intermediate layer of cells of diamond-shaped cross-section; Fig. 4 shows an intermediate layer of cells of square cross-section; F ig. 5 illustrates an intermediate layer of cells with a corrugated cross section; Fig. 6 illustrates an intermediate layer with honeycomb cross-sectional cells; Fig. 7 illustrates an intermediate layer with cells of another type of honeycomb cross-section; F ig. 8A-8C illustrate an intermediate layer of cells of varying cross-section; Fig. 9 is an enlargement of the first layer of micro-slots shown in Fig. 1; Fig. 10 illustrates an equipment for manufacturing the micro-slots shown in Figs. 1 and 9; Fig. 11 illustrates interrupted micro-slots; Figs. 12A and 12B illustrate differently designed sound absorbers; Figs. 13A-13F likewise illustrate differently designed sound absorbers; Fig. 14 illustrates a sound absorber with angled cells; Fig. 15 illustrates sound absorbers mounted in the ceiling; Fig. 16 illustrates a sound absorber in the form of a work of art; and Fig. 17 illustrates different uses of the sound absorber.
    DETAILED DESCRIPTION Figure 1 shows a sound absorber 2 having the shape of a rectangular parallelepiped with substantially uniform thickness T, comprising a first layer 4, a second layer 6 and an intermediate layer 8. The latter likewise has the shape of a rectangular parallelepiped with even core thickness two.
    The first layer 4 is made of a cellulosic material, polymeric material or metal and has a first thickness t1, while the second layer has a second thickness tz. The material of the second layer 6 is of a cellulosic material, polymeric material or metal, and may be of the same material as the first layer 4, although the first and second layers may be of different materials.
    The total thickness T of the sound absorber 2 is thus the sum of the first thickness t1, the core thickness tc and the second thickness tz.
    The first thickness t, of said first layer is in the range 10 micrometers to 5 mm, more preferably 20 micrometers to 0.9 mm, most preferably 50 micrometers to 0.6 mm. The second thickness 2 of the second layer is preferably in the same area as the first thickness t1, but may be thinner or thicker than said area. On the other hand, the thickness tg of the second layer may be substantially the same as the first thickness t1. The first layer 4 and the second layer 6 are arranged on opposite sides of the intermediate layer 8 and are thus parallel to each other.
    The intermediate layer 8 comprises a plurality of elongate cells 12, the length of which corresponds to the core thickness tc of the intermediate layer 8. The cells 12 are delimited by walls 13, the thickness of which is in the range 10 micrometers to 0.5 mm, more preferably 30 micrometers to 0.3 mm, most preferably 50 micrometers to 0.2 mm. The walls 13 are made of a cellulosic material, polymeric material or metal.
    The core thickness, i.e. the thickness tc of the intermediate layer 8, is in the range 1 - 200 mm, more preferably 5 - 50 mm, most preferably 10 - 30 mm.
    The elongate cells 12 as such have first and second open ends 14, 16, but are covered by the first layer 4 and the second layer 6.
    The first layer 4 is provided with a plurality of substantially parallel micro-slots 10, which penetrate the first layer 4 substantially through the first thickness t1 to the intermediate layer 8, and connect the cells 12 to the ambient air.
    To obtain a desired sound attenuation, the number of cells per square meter of a cross section of the intermediate layer 8 is in the range 1 to 100,000,000, more preferably 100 to 1,000,000, most preferably 500 to 200,000.
    Figure 2 shows in cross section along the lines ll-ll in Fig. 1 a number of cells 12 of different geometries; each cell 12a is delimited by a wall 13 of circular cross-section 18a, while each cell 12b is delimited by a wall 13 of a star-shaped cross-section 18b. The star-shaped cells 12b are placed between the circular cells 12a to thereby fill the remaining space between the circularly shaped cells, in order to improve the sound attenuation compared to if the spaces were filled with, for example, glue. Figure 3 shows cells 12 of yet another form. A plurality of corrugated blades 20a, 20b are formed with sharp cams 22 and valleys 24 (ie zigzag shape) and are connected to each other by the cams 22 of the second corrugated blade 20a and the valleys 24 of the first corrugated blade abutting each other.
    Hereby each cell 12 is delimited by walls 13 which together have a diamond or rhomboid cross section 18c.
    Alternatively, a flat blade is located between the first and second corrugated blades 20a, 20b, while the valleys 24 of the first corrugated blade 20a are connected to one side of the flat blade, while the ridges 22 of the blade 20b are connected to the opposite side of the flat blade. As a result, each cell 12 is delimited by the flat blade and the walls 13, and the cross section of the cells will become triangular. It should be noted that for manufacturing reasons it is preferable to arrange the valleys and ridges of the first and second blades 20a, 20b in a mirrored manner so that the valleys and ridges can be connected simultaneously to the flat blade, for example by spot or line welding.
    Figure 4 shows cells 12 of yet another form. A plurality of corrugated blades 20a, 20b, are formed into a square waveform. A first flat blade 26a and a second flat blade 26b are connected to each side of the corrugated blade 20a.
    Hereby the cells 12d are delimited by the walls 13, which together form a square cross-section 18d.
    Alternatively, if the corrugated square wave blades 20c are connected to each other directly above each other, the cross section of the cells will be square. According to another alternative, the corrugated square wave blades 20c can be connected to each other without the blade 26a, 26b (corresponding to the method shown in Fig. 3), the cross-section of the cells becoming rectangular.
    Figure 5 shows an alternative embodiment according to which the flat blades 26a, 26b, 26c, etc. are arranged between sinusoidal wave-shaped blades. The cross-section of the cells then becomes a half sine wave or essentially a semicircular shape. It should be noted that for manufacturing reasons it is preferable to arrange the valleys and ridges of the first and second blades 20a, 20b in a mirror-shaped manner so that the sine waves of the valleys and ridges can be connected simultaneously to a flat blade e.g. by spot or line welding.
    If the embodiment according to Fig. 5 is used without flat blades between the sine waves, with connection of the valleys directly to the ridges of adjacent sine wave blades, the cross section of the cells will instead be lemon-shaped (or substantially circular or oval).
    Figure 6 shows another variant of the cells 12, according to which a plurality of the first corrugated blades 20d are formed with flat cams 22 and sharp valleys 24, while a plurality of other corrugated blades 20d are formed mirror-inverted, i.e. with sharp combs 22 and flat valleys 24 and placed relative to each other as shown in Fig. 3. As a result, the cross section of the cells 12 (formed by the walls 13) between the planar cams 22 and the planar valleys 24 becomes hexagonal, while the cells between the sharp cams 22 and the sharp valleys 24 become diamond rhomboid or square shaped. Also in this case a flat blade can of course be arranged between the corrugated blades.
    Figure 7 shows an opportunity to obtain cells of different sizes. In this way, a varying sound attenuation can be obtained.
    The cells 12 shown in Figures 1-7 are all cylindrical, i.e. the cross-section of the longitudinal extent of the cell 12 from the first open end 14 to the second open end 16 is constant.
    Figures 8A-8C show an alternative configuration of cells with varying cross-sections.
    As shown in Figures 8A -8B, the wall 13 forming each cell 12 has a waist or an hourglass shape. At the first open end 14, the cell 12 has a first cross section 18 '. The cross section decreases to approximately the middle longitudinal extent of the cell 12 and then widens towards the second open end 16 to a second cross section 18 ". The first cross section 18 'is substantially the same as the second cross section 18", and the waist 30 is substantially halfway between the first one end and the other end.
    Of course, the waist 30 may be located closer to the first open end 14 or the second open end 16. Likewise, the first cross-section 18 "may be larger than the second cross-section 18" and vice versa.
    As shown in Figure 8C, the cross-section 18 may instead be in the form of a truncated cone 32, i.e. the cross-section is circular, the diameter varying continuously from the first open end 14 to the second open end 16. The cross-section 18 'of the first end 14 is larger than the other end 16 cross section 18 ”or vice versa. Figure 9 shows a section of the first layer 4. As shown, the micro-slot 10 has the width a and is arranged parallel to and with the distance b from each other, and as shown in Fig. 10 the micro-slots have the length L.
    Figure 10 further shows the manufacture of micro-slots in a sound absorber 2. A robot 50 controlled by a microcomputer 52 is programmed to control the movements of a robot arm 54. A tool holder 56 is provided with a replaceable cutting tool 58, such as a cutting steel or a knife.
    Alternatively, the tool as such may be oscillating, such as a saw, or rotating, such as a circular saw or an end mill. Alternatively, the tool can be a punching knife. In both cases, the robot only needs a reprogramming of the computer.
    A cutting tool 58 for cutting a micro-slot of width a is selected in such a way that the cut micro-slot obtains a width a within a range 1 micrometer to 1 mm, more preferably 10 micrometers to 0.9 mm, most preferably 0.3-0 , 5 mm. The computer 52 of the robot 50 is programmed in such a way that it will control the robot arm to perform longitudinal movements and cut slits at a distance b from each other, so that adjacent slits are cut at a distance b within a range of 1 micrometer. to 10 mm, more preferably 10 micrometers to 5 mm, most preferably 0.5 - 2 mm.
    The computer 52 is further programmed to control the robot arm to cut the slits to a length L in the range 2 - 2000 mm, more preferably 10 - 1000 mm, most preferably 100 - 1000 mm.
    As can be seen in Figure 11, each of a plurality of aligned slots 10 may have a length L, while together they have a total length Lu, which may be within a range of 4 mm up to several meters; only the size of the sound absorber 2 sets the upper limit.
    Figures 12A-12B show a circular sound absorber 2 with a plurality of parallel slits 10. In the case shown in Fig. 12A, the diameter of the circular sound absorber 2 sets the upper limit of the length of each slit L (or at a plurality of aligned slits ( cf. Fig. 11) the total length LM).
    In the variant shown in Fig. 12B, instead a helical single slot 10 is arranged in the first layer 4. Depending on the distance between adjacent turns of the coil, the length of the slot L can be many meters.
    In all the embodiments described above, the intermediate layer has been shown with a constant thickness to so that the first layer 4 and the second layer 6 are parallel to each other.
    As shown in Figures 13A-13F, the thickness of the intermediate layer tci can instead be anything but constant, and thus the first layer 4 and the second layer 5 will not be parallel. In Fig. 13A, the intermediate layer 8 is concave 60 on the side facing the first layer 4 in such a way that also the first layer 4 will become concave, while the opposite side 8 of the intermediate layer 8 is flat and thus becomes also the second layer 6 flat.
    In Fig. 13B, the intermediate layer 8 is concave 60 also on the side facing the second layer 4 and thus both the first and second layers 4, 6 are concave 60.
    In Fig. 13C, the intermediate layer 8 is instead convex 62 on the side facing the first layer 4, in such a way that also the first layer 4 will become convex 62, while the opposite side 8 of the intermediate layer 8 is flat, and thus is also the second layer 6 flat.
    In Fig. 13D, the intermediate layer 8 is convex 62 also on the side facing the second layer 6, and thus both the first and the second layer 4, 6 are convex 62.
    In Fig. 13E, the intermediate layer 8 is concave 60 on the side facing the first layer 4 in such a way that also the first layer 4 is caused to become concave 60, while the opposite side of the intermediate layer 8 is convex 62, and thus is also the second layer 6 convex 62. Another concave-convex shape is shown in Fig. 17.
    Fig. 13F shows another embodiment of the sound absorber 2, the intermediate layer having a double-sloping side facing the first layer 4, so that the first layer is also double-sloping, while the opposite side of the intermediate layer facing the second layer 6 is flat.
    Of course, the intermediate layer 8 side, which faces the second layer 6, can also be double-sloping.
    In the figures referred to above, the layers 8 of the cells have been shown with a length corresponding to the core thickness tc of the intermediate layer 8. As shown in Figure 14, the cells 12 may instead be angled relative to a normal to the layers 4 and 6. The angle u may be in the range 0 ° - 30 °.
    Figure 15 shows recangular sound absorbers 2 connected to the ceiling with fastening means 72, which hang down from the ceiling. In this case, when sound is to be absorbed from two sides, not only the first layer 4 must be provided with micro-slots 10, but also the second layer 6.
    In addition, as seen in Fig. 15, the elongate slits may be arranged diagonally opposite the edges of the recangular sound absorber. Of course, all the variants of sound absorbers 2 shown above can be provided with slots arranged at an angle to and in the plane of the first (or the second) layer.
    Figure 16 shows a sound absorber 2 with a pattern of micro-slits 10 which also has an aesthetic effect.
    Figure 17 shows a room arranged with different kinds of sound absorbers 2 provided with micro-slots 10 in the first as well as the second layer 4, 6 and also arranged on racks 80. This type of sound absorber 2 is suitable for, for example, open office landscapes.
    Fig. 17 also shows sound absorbers 2 in the form of works of art 82, 84, where the pattern of the micro-slits is such that they give an aesthetic effect of the object 82 (the surface preferably has a uniform color, such as white, to emphasize the pattern of the micro-slits), while the object 84 is provided with an image on the surface of the first layer, the micro-slots being arranged on the image. The micro-slots 10 will in this case become more or less invisible depending on the character and color of the image.
    List of reference numerals used 2 sound absorber 4 first layer 6 second layer 8 intermediate layers 10 15 20 25 30 10 12.12a, 12b, 12c, 12d 13 14 16 18.18a, 18b, 18c, 18 ', 18 "20a, 20b, 20c, 20d 22 24 26,26a, 26b, 26c 30 32 50 52 54 56 58 60 62 72 80 82 84 - '| <1 "" k'> "'Ql-I-UN 14 micro-slot cell Wall first open end second open end cross section corrugated blade comb valley flat leaf waist truncated cone robot microcomputer robot arm tool holder cutting tool concave convex fastener set artwork artwork first thickness second thickness core thickness total thickness width distance total length angle
    权利要求:
    Claims (1)
    [1]
    1. 0 15 20 25 30 15 PATENT REQUIREMENTS. A sound absorber comprising a first layer (4), a second layer (6), and an intermediate layer (8), said intermediate layer (8) comprising walls (13) delimiting a plurality of cells (12, 12a, 12b, 12c , 12d), which are open in a first end (14) and a second end (16), said cells being arranged next to each other, said first open end (14) of said plurality of cells being covered by said first covering layer ( 4), said second open end (16) of said plurality of cells being covered by said second covering layer (6), characterized in that said first layer (4) is provided with at least one micro-slot (10) by mechanical processing, the micro-slot (10) extends through said first layer (4) so that sound waves are allowed to penetrate the micro-slot (10) and penetrate into the first open end (14) of the cell. . A sound absorber according to claim 1, wherein the second layer (6) is provided with at least one micro-slot (10) so that sound waves are allowed to penetrate the micro-slot and penetrate into the other open end (16) of the cell. . A sound absorber according to claim 1 or 2, wherein the length (L) of the micro-slot is in the range 2 mm - 2 km, more preferably 10 - 1000 mm, most preferably 100 - 1000 mm. . A sound absorber according to any one of claims 1 to 3, wherein the width (a) of the slit is in the range 1 μm to 1 mm, more preferably 10 μm to 0.9 mm, most preferably 0.3 to 0.5 mm. . A sound absorber according to any one of the preceding claims, wherein the thickness of the wall (13) is in the range 10 μm to 0.5 mm, more preferably 30 μm to 0.3 mm, most preferably 50 μm to 0.2 mm. . A sound absorber according to any one of the preceding claims, wherein the walls (13) are designed to form a plurality of cylinders of predetermined opening area and cross section, each with a substantially constant cross section (18, 18a, 18b, 18c). A sound absorber according to claim 6, wherein the cross section is substantially circular. A sound absorber according to claim 6, wherein the cross section is polygonal. A sound absorber according to any one of claims 6 to 8, wherein the cross section is substantially star-shaped. A sound absorber according to any one of claims 6-9, wherein the cylinders have different cross-sectional areas. A sound absorber according to any one of claims 1-5, wherein the walls are designed to form a plurality of cells of varying cross-section, such as a truncated cone or the shape of an hourglass. A sound absorber according to claim 6, wherein at least every other blade is formed of a corrugated blade or plate (20a, 20b, 20c, 20d), each other wall being a substantially flat blade or plate (26, 26a, 26b, 260) arranged between every other corrugated sheet or plate (20a, 20b, 20c, 20d). A sound absorber according to any one of the preceding claims, wherein the thickness (t1) of the first layer is in the range 10 μm to 5 mm, more preferably 20 μm to 0.9 mm, most preferably 50 μm to 0.6 mm. A sound absorber according to any one of the preceding claims, wherein the thickness (tg) of the second layer is in the range 10 μm to 5 mm, more preferably 20 μm to 0.9 mm, most preferably 50 μm to 0.6 mm. A sound absorber according to any one of the preceding claims, wherein said blade (13) is made of a cellulosic material, a polymeric material or metal. A sound absorber according to any one of the preceding claims, wherein said first layer (4) is made of a cellulosic material, a polymeric material or metal. A sound absorber according to any one of the preceding claims, wherein said second layer (6) is made of a cellulosic material, a polymeric material or metal. A sound absorber according to any one of the preceding claims, wherein the thickness (to) of the intermediate layer is in the range 1-200 mm, more preferably 5 - 50 mm, most preferably 10 - 30 mm. A sound absorber according to any one of the preceding claims, wherein the number of cells per m2 in a cross section of the intermediate layer (8) is 1 to 100,000,000, more preferably 100 to 1,000,000, most preferably 500 to 200,000. for manufacturing a sound absorber according to any one of the preceding claims, wherein said micro-slot (10) is manufactured by mechanical machining with a mechanical tool. The method of claim 20, comprising selecting a predetermined material for the intermediate layer, selecting a predetermined layer for the first layer (4), and selecting a predetermined material for the second layer (6). A method according to claim 21, wherein the first layer (4) is connected, for example, by gluing to the intermediate layer (8) before the micro-slots are formed in the first layer (4). A method according to claim 21, wherein the second layer is connected by gluing to the intermediate layer (8) before the micro-slots (10) are formed in the second layer (6). A method according to claim 21, wherein the first layer (4) as well as the second layer (6) are connected by gluing to the intermediate layer (8) before the micro-slots are formed in the first layer (4). A method according to claim 21, wherein the slot in the second layer (6) is performed after both the first layer (4) and the second layer (6) have been connected to the intermediate layer (8), before the micro-slot (10) is formed in the first layer (8). A method according to claim 21, wherein the mechanical machining includes punching, said mechanical tool being, for example, a punching knife. The method of claim 21, wherein the mechanical machining includes slitting by means of a slitting machine, said mechanical tool being a knife. The method of claim 21, wherein the mechanical machining includes cutting machining, said mechanical tool being a cutting steel with a cutting edge. A method according to any one of claims 21-27, including selecting a mechanical tool from a tool set to obtain a predetermined slot width, connecting said mechanical tool to a computer controlled numerical machine, and programming the slot length, slot depth and distance between the slots for obtaining of a predetermined sound attenuation.
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    同族专利:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1200115|2012-02-23|
    SE1200253A|SE536860C2|2012-02-23|2012-04-26|A sound absorber|SE1200253A| SE536860C2|2012-02-23|2012-04-26|A sound absorber|
    PCT/EP2013/000517| WO2013124069A2|2012-02-23|2013-02-22|A sound absorbent|
    DE13711565.5T| DE13711565T1|2012-02-23|2013-02-22|sound absorber|
    EP13711565.5A| EP2817799A2|2012-02-23|2013-02-22|A sound absorbent|
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