Acoustic panel

Abstract

The current disclosure relates to an acoustic panel comprising a frame wherein a sound absorbing arrangement may be inserted into the frame from the front. The disclosure further relates to a method of installing such an acoustic panel and to an array of acoustic panels.

Description

[0001] Acoustic panel

[0002] The current disclosure relates to an acoustic panel comprising a frame wherein a sound absorbing arrangement may be inserted into the frame from the front. The disclosure further relates to a method of installing such an acoustic panel and to an array of acoustic panels.

[0003] Background

[0004] The indoor climate consists of many different factors. One such factor is for example the sound or acoustics of a room. Depending on the function of the room different acoustic properties are desired and being able to control how sound travel is key in providing an optimal acoustic experience in a room.

[0005] Furthermore, another factor in the indoor climate is the visual aspects of a room. Thus, when implementing products that control the acoustics of the room it is also important that those products fit in visually.

[0006] One such acoustic product are acoustics panels that are formed of a frame that can be hung on the wall. A sound absorbing arrangement may then be arranged within the frame. A canvas or sheet can be arranged over the sound absorbing arrangement. The canvas can have a uniform color, a pattern, or a print such as a photo on it depending on the visual appearance that is desired.

[0007] Such known solutions are well suited for smaller and medium sized acoustic panels.

[0008] For larger acoustic panels the frame needs to be mounted on the wall to begin with so that the frame does not deform over time. This is done by partially mounting the frame, insert the sound absorbing arrangement in the frame from the side and then close the frame. This puts considerable limitations on the size of the acoustic panel as it is not possible with this method to arrange acoustic panels on the wall that is larger than half the size of the wall as it becomes impossible to slide the sound absorbing arrangement in from the side.

[0009] Accordingly, there is a need to provide a solution that also is suitable for large acoustic panels. Summary

[0010] In a first aspect there is disclosed an acoustic panel. The acoustic panel comprises a frame, which defines an opening. The opening has an opening width w0, an opening height h0and an opening thickness t0. The acoustic panel further comprises a sound absorbing arrangement, which is arranged in the opening of the frame.

[0011] An inner surface extends around on the inside the frame and defines the opening width w0and the opening height h0corresponding to the dimensions across the opening. The sound absorbing arrangement comprises an arrangement width waand an arrangement height hacorresponding to the dimensions across the sound absorbing arrangement. The arrangement height haand arrangement width waare smaller than the corresponding opening height h0and width w0such that the absorbing arrangement can be placed in the frame opening.

[0012] The inner surface extends from a distal end to a proximal end along the thickness t0of the opening. The inner surface further comprises a protrusion extending from the inner surface and extend at least partially around the opening. The protrusion extends in a protrusion distance dpfrom the inner surface such that at least a part of the dimensions between opposing protrusions in the frame are smaller than the corresponding arrangement width waand / or arrangement height ha. In other words, the protrusion reduces the opening width w0and opening height h0in an area to be smaller than the arrangement width waand the arrangement height ha.

[0013] This allows for an acoustic panel where the entire frame can be installed on a wall, for example using screws in order to secure the position of the frame and avoid it being deformed or bulge when a load is applied. When the frame has been installed the sound absorbing arrangement can be pushed into the opening from the front of the frame, i.e. at the proximal end of the inner surface and pushed past the protrusion whereafter the protrusion will maintain the sound absorbing arrangement in place.

[0014] Thus, by being able to insert the sound absorbing arrangement in this way the space restriction of the prior acoustic panels are removed and larger acoustic panels can be installed. In particular, acoustic panels which are larger than 50% of the wall surface can be installed.

[0015] In a second aspect there is disclosed an array of acoustic panels comprising at least two acoustic panels, such as a plurality of acoustic panels, as disclosed herein arranged on a vertical surface such as a wall. The acoustic panels may in one embodiment have identical dimensions or may in other embodiments have different dimensions. The array may be arranged in symmetrical / similar grid arrangement or may may be arranged offset to each other.

[0016] For example, in one embodiment the distances between neighbouring acoustic panels are the same.

[0017] Such an array can for example form a puzzle like arrangement. In such a puzzle like arrangement the cover sheets of the plurality of acoustic panels may together form an image or design.

[0018] In a third aspect there is disclosed a method of mounting an acoustic panel as disclosed herein. In a first step the frame is mounted vertically on a wall and fixed with fasteners such as screws. This allows for properly fastening of the frame and ensures that the frame does not slump or deform.

[0019] The sound absorbing arrangement is subsequently inserted into the frame by pushing it into the frame from the proximal end past the protrusion. In this way the sound absorbing arrangement is inserted from the front and there is no need to consider additional space on the side and it is thereby possible to have an acoustic panel which fills more than half a wall surface, for example a full wall surface.

[0020] A cover sheet may be arranged over the frame such that it covers the sound absorbing arrangement.

[0021] Detailed description In one embodiment the protrusion extends from the inner surface transverse to the thickness t0of the opening, i.e. the protrusion extends from the inner surface into the opening.

[0022] In order to support the sound absorbing arrangement when placed in the frame the acoustic panel in one embodiment further comprises a back surface of the frame, which extends from the distal end of the inner surface. The back surface preferably extends in a back distance db from the inner surface, where the back distance is larger than the protrusion distance dp.

[0023] In order to properly retain the sound absorbing arrangement in the frame and ensure a tight fit, the retaining distance drbetween the back surface and protrusion is in one embodiment equal to or larger than the thickness taof the sound absorbing arrangement.

[0024] The protrusion may be designed with different shapes in order to for example facilitate the insertion of the sound absorbing element or securing the sound absorbing element when placed in the frame.

[0025] For example, in one embodiment, the protrusion may comprise a distal surface facing towards the distal end of the inner surface and where the distal surface extends perpendicular to the inner surface. This further ensures that the sound absorbing element is held in place in the frame as the distal surface function as a stop.

[0026] In an additional or alternative embodiment, the protrusion may comprise a proximal surface facing towards the proximal end of the inner surface and where the proximal surface extends at an obtuse angle a with the inner surface. This forms an angled surface over which the sound absorbing arrangement may slide into the frame. The angle may for example be 91°or above, such as between 100° to 170°, more specifically between 125° to 145°, such as 135°.

[0027] Thus, as discussed previously, the sound absorbing arrangement may be installed by pushing it in from the front of the frame and the angle a of the proximal surface may be adjusted to facilitate the installation. In another embodiment the insertion and retainment of the sound absorbing arrangement can be controlled by choosing an appropriate protrusion distance dp. For example, the protrusion distance may be above 1 mm, in particular above 2 mm or between 1 and 7 mm, for example 2,25 mm.

[0028] In one embodiment the thickness taof the sound absorbing arrangement should also be considered as this also may determine the retaining distance between the back surface and protrusion as previously discussed. For example, the thickness of the sound absorbing arrangement may be between 10 mm and 100 mm, preferably between 30 mm and 50 mm, such as 33 mm to 41 mm and most preferred between 35 mm to 39 mm. Tolerances should of course also be considered when understanding these ranges. The thickness will also affect the sound absorbing properties of the sound absorbing arrangement.

[0029] In another embodiment the width of the sound absorbing arrangement can be between 500 mm and 5000 mm and the height of the sound absorbing arrangement is between 600 mm and 2400 mm.

[0030] In one embodiment the sound absorbing arrangement is made up of one single sound absorbing element. In another embodiment the sound absorbing arrangement is made up of a plurality of sound absorbing elements.

[0031] In one embodiment, the sound absorbing arrangement is made up of a single sound absorbing element. In such embodiment the acoustic panel can have a height and width of up to 1200 mm by 2400 mm.

[0032] In another embodiment, the sound absorbing arrangement is made up of a plurality of sound absorbing elements. In such embodiment the acoustic panel can have a height and width of between 1200 mm by 2400mm to 1800 mm by 4000 mm.

[0033] In an even further embodiment, the sound absorbing arrangement is made up of a plurality of sound absorbing elements. In such embodiment the acoustic panel can have a width of up to 15000 mm or even up to 20000 mm. The sound absorbing element(s) can for example be a mineral wool product formed of glass wool or stone wool. Mineral wool products as discussed herein provides good acoustic absorption properties and moreover a high fire resistance is also provided, in particular when using stone wool.

[0034] The sound absorbing element may for example be covered on one or both sides, e.g. the front and back, by a vlies, a fleece, scrim or other type of facing or fabric, typically a thin non-woven material. An additional coating may also be provided on the front surface facing out of the frame, such as a grained coating, to improve the acoustic absorbing properties.

[0035] For example, in one embodiment the front surface of the sound absorbing element may be covered by a front glass fleece with a density of 120 g / m2, whereon a surface coating can be applied in an amount of 395 g / m2, for example from Owens Corning. On the back surface of the sound absorbing element there may be arranged a glass fleece with a density of 50 g / m2. Both the front and back fleece may be secured to the sound absorbing element using the binder of the mineral wool during curing or a separate glue may be used. In particular the front fleece and coating ensures good sound absorbing properties of the sound absorbing element.

[0036] The sound absorbing element can for example be formed by a process comprising collecting mineral fibres and binder entrained in air on a travelling collector and vertically compressing the collected fibres, optionally after cross-lapping, to form a web, reorienting the fibres to provide an unbonded sound absorbing element having a density of 70 to 200 kg / m3, curing the binder to form a bonded sound absorbing element (which may also be referred to as a cured sound absorbing element), cutting the bonded sound absorbing element in a plane parallel to the bonded sound absorbing element, smoothing the cut surface by abrasion, and applying the facing or fabric to the cut and abraded surface of the bonded sound absorbing element. This result in sound absorbing elements of moderate density and having good acoustic properties (for instance aw of at least 0.8 or 0.85 and preferably above 0.9 or 0.95), good mechanical properties (in particular edge strength) and having a flat front face. A sound absorbing element formed of stone wool can for example be produced using a known melting technique such as a cupola or an electrical melter. The melt may then be processed using a known spinning technique such as a cup or cascade spinner.

[0037] The sound absorbing element may for example comprise fibers with a diameter of 2 - 9 pm, for example between 3 - 6 pm.

[0038] The sound absorbing element may further comprise an LOI (loss of ignition) between 2 - 8%, for example between 3 - 5%.

[0039] Even further, the sound absorbing element may comprise a density between 40 - 200 kg / m3, such as 80 - 150 kg / m3, for example 90 kg / m3.

[0040] In particular the relationship between protrusion distance and the flexibility of the sound absorbing element can in further embodiments be adjusted in order to create an acoustic panel where the sound absorbing arrangement can be easily inserted but also well retained. However, if the flexibility of the sound absorbing arrangement is too high and / or the protrusion distance too low the sound absorbing arrangement may be easily inserted but will not be retained in the frame and fall out. If the flexibility is too high the sound absorbing arrangement may even bend or collapse. On the contrary a sound absorbing arrangement which is too stiff, i.e. the flexibility is low, and / or the protrusion distance is too high, may create an acoustic panel where the sound absorbing arrangement cannot be inserted without causing damage to the product.

[0041] In particular the density of the sound absorbing arrangement affects the flexibility thereof. Thus, in one embodiment the protrusion distance is selected between 1 and 7 mm while the density of the sound absorbing element is selected between 40 - 200 kg / m3, such as 80 - 150 kg / m3, for example 90 kg / m3..

[0042] In one embodiment the frame is a square frame comprising a first, a second, a third and a fourth side element wherein each side element comprises a respective first, second, third and a fourth inner partial surface which all together form the inner surface defining the opening. The first, second, third and fourth side elements can for example be formed of extruded aluminium profiles. The aluminium profiles can in one embodiment comprise 50 - 100% recycled content.

[0043] The acoustic panel may be used with the frame and the sound absorbing arrangement only and can for example be mounted on a wall as described. However, a cover sheet may also be extended across the frame to cover the sound absorbing arrangement. The cover sheet will thereby provide the visible properties of the acoustic panel whereas the sound absorbing arrangement provides the acoustic properties. By providing the cover sheet with a desired colour, pattern or print a vast range of visuals may be achieved and the acoustic panel can be customized to fit in any environment. The cover sheet can moreover be easily replaced to provide a new visual identity to the acoustic panel.

[0044] The cover sheet can for example be formed of polyester comprising anywhere between 0 - 100% recycled material. In particular the stretch is provided from the polyester. The cover sheet may have a weight between 150 - 300 g / m2for example 210 g / m2. Such a material will also provide a cover sheet that has a good combination of elasticity and stability. The elasticity helps when mounting the cover sheet on the frame and the stability ensures a that the frame is held well in place and helps in keeping the shape of the frame.

[0045] Accordingly, to accommodate such a cover sheet, a recess can be arranged at the proximal end of the frame, wherein the recess extends transverse to the inner surface and opens out away from the frame and where the recess extends around the frame.

[0046] The cover sheet may in one embodiment comprise a cover height and a cover width corresponding to the distances between the recess as it extends around the frame and wherein the cover sheet further comprises an attachment element for fastening the cover sheet to the frame by connecting the at least one attachment element in the recess. The attachment element can also be referred to as a keder and can for example be a PVC, polyester or silicone material which is deformable and can be squeezed into the recess in order to provide a friction fit.

[0047] Drawings Specific embodiments will in the following be discussed with reference to the accompanying drawings, in which:

[0048] Figure 1 is an illustration of a first embodiment of an acoustic panel as discussed herein, Figure 2 is an illustration of section II - II in Figure 1 ,

[0049] Figure 3 is an illustration of a sectional view of the frame corresponding to Figure 2 above (without the sound absorbing arrangement) to show further details, Figure 4 is an illustration of section IV in Figure 1 ,

[0050] Figure 5 is an illustration one embodiment of an angled bracket for assembling the frame of the acoustic panel,

[0051] Figure 6 is an illustration of a second embodiment of an acoustic panel as discussed herein,

[0052] Figure 7 is an illustration of a third embodiment of an acoustic panel as discussed herein, and

[0053] Figure 8 is an illustration of an array of acoustic panels as discussed herein.

[0054] Figures 1 , 2, 3 and 4 show a first embodiment of an acoustic panel 1 as discussed herein. The acoustic panel comprises a frame 2 and the frame defines an opening 3.

[0055] In the current embodiment the frame is a square frame with an opening width w0and an opening height h0, which is defined by an inner surface 5 which extends around the frame. The opening also has an opening thickness t0extending transverse to the opening width and the opening height.

[0056] The frame 2 shown in Figs. 1 , 2, 3 and 4 is a square frame and is made up of a first 21 , a second 22, a third 23 and a fourth 24 side elements The side elements 21 , 22, 23, 24 are extruded aluminium profiles where all the side elements have the same profile as shown in e.g. Figures 2 and 3.

[0057] The side elements 21 , 22, 23, 24 are assembled at 45 degrees angles and each side element comprises a respective first 51 , second 52, third 53 and a fourth 54 inner partial surface which together form the inner surface 5 that defines the opening 3 of the frame 2. A first 61 , second 62, third 63 and fourth 64 partial protrusion extend from the respective inner partial surfaces and the partial protrusions form the protrusion 6 of the frame 2.

[0058] A sound absorbing arrangement 4 is arranged in the opening of the frame. The sound absorbing arrangement is in the current embodiment a sound absorbing element made from stone wool and has a density of between 80 - 150 kg / m3. The sound absorbing arrangement has an arrangement width waand an arrangement height hawhich are smaller than the corresponding opening height h0and width w0such that the sound absorbing arrangement can be placed in the frame opening.

[0059] The inner surface 5, which in the embodiment shown in Fig. 2 is formed of two surface parts 5a and 5b, extends from a distal end 7 to a proximal end 8 of the inner surface 5 along the thickness of the opening t0.

[0060] The inner surface 5, 5a further comprises a protrusion 6. The protrusion extends from the inner surface in a protrusion distance dpand follows the inner surface around the opening. The protrusion distance of the protrusion has a dimension such that at least a part of the dimensions between opposing protrusions in the frame are smaller than the corresponding arrangement width waand / or arrangement height ha.

[0061] This provides an edge, formed by the protrusion, over which the sound absorbing arrangement has to be pushed in order for the arrangement to be received in the frame. By dimensioning the protrusion distance dprelative to the type of sound absorbing arrangement, in particular the flexibility and density thereof, optimal insertion and retaining properties can be achieved.

[0062] From Figure 4 it can for example be seen that the edge 31 (indicated by the dashed line) of the sound absorbing element 3 is retained behind the first partial protrusion 61 and fourth partial protrusion 62 of the respective first and fourth side elements 21 , 24.

[0063] In this embodiment the first partial protrusion 61 and the third partial protrusion 63 form opposing protrusions in the frame and the distance between these is smaller than the width waof the sound absorbing arrangement. Similarly, the second partial protrusion 62 and the fourth partial protrusion 64 form opposing protrusions in the frame and where the distance between these is smaller than the heigh haof the sound absorbing arrangement.

[0064] The protrusion comprises a distal surface 6” facing towards the distal end 7 of the inner surface. The distal surface extends perpendicular to the inner surface. In the embodiment of Fig. 2 the distal surface extends in a protrusion distance dp of 2,25 mm.

[0065] The protrusion further comprises a proximal surface 6’ facing towards the proximal end 8 of the inner surface. The proximal surface extends at an obtuse angle a with the inner surface. In the current embodiment the proximal surface defines a curved surface which creates a dynamic angle a that starts close to 180° at the inner surface and gradually decreases toward 100° or below as the proximal surface extends toward the distal end (7) of the inner surface (5), for example as the proximal surface transitions to the distal surface 6”. Typically, such a dynamic angle can at a specific point be determined by considering the tangent to the curvature at the specific point on the curved surface. Of course, this range can be varied depending on the desired curvature and the desired effect of the proximal surface. In another embodiment the proximal surface can for example be a planar surface, which for example have an angle a of between 125° and 145°, for example 135°.

[0066] As discussed previously, providing an angled proximal surface on the protrusion facilitates the insertion of the sound absorbing arrangement into the frame when installing the acoustic panel.

[0067] The frame is further provided with a back surface 9 which extends from the distal end 7 of the inner surface 5, 5b. The back surface extends in a back distance db from the inner surface, where the back distance is larger than the protrusion distance.

[0068] In order to snugly fit the sound absorbing arrangement in the frame, the retaining distance drbetween the back surface and the protrusion is equal to the thickness of the sound absorbing arrangement. In the current embodiment the thickness of the sound absorbing arrangement is ta= 35 mm. A recess 10 is furthermore arranged at the proximal end 8 of the frame 2. The recess extends transverse to the inner surface 5 and opens out away from the frame. The recess extends around the frame.

[0069] The recess allows for a cover sheet (not shown) to be attached to the frame. The cover sheet comprises a cover height and a cover width corresponding to a distance between the recess as it extends around the frame. Attachment elements for fastening the cover sheet to the frame are provided on the cover sheet. The attachment elements are secured to the frame by a friction fit coupling of the attachment elements in the recess. This can for example be achieved by forming the attachment elements in a rubber material which has dimension that are slightly larger than the recess and thus frictionally engages within the recess.

[0070] To further improve the acoustic properties of the acoustic panel the cover sheet is arranged at a distance from the surface of the sound absorbing arrangement. This is achieved by providing a distance between the outer edge of the proximal end 8 and the protrusion, in this case the distal surface 6” thereof. Such a cover element distance dcis in the current example 8 mm, but can in other embodiments be adjusted to provide the preferred result.

[0071] In certain embodiments the cover sheet is made up of a light-coloured material which can be slightly transparent. The transparency may in some cases allow for undesired features, such as edges and material changes, to shine through the cover sheet. For example, a protrusion with a large protrusion distance dpwill create an undesired frame within the frame appearance behind the cover sheet. Thus, as is possible as discussed herein the protrusion distance dpcan be adjusted to eliminate or considerably reduce such visually undesired featured.

[0072] An assembly groove 11 is furthermore provided in the inner surface 5, where the assembly groove separates the inner surface into the two surface parts 5a and 5b. The assembly groove is particularly used for connecting the side elements together to for the square frame. This can for example be done by an angled bracket 400, as shown in Fig. 5. The angled bracket comprising a first 401 and a second 402 flange extending perpendicular to each other. The first flange 401 can for example be inserted into the assembly groove of the first side element 21 and the second flange 402 can for example be inserted into the assembly groove of the fourth side element 24 in order to provide the frame corner shown in Fig. 4. When properly inserted the angled brackets can be secured to the respective side element by using pinion screws through the attachment holes 403, 404, 405 and 406. The first and second flange extend from a corner member 407. The corner member has a thickness transverse to the extent of the flanges such that when it is arranged as described it will be flush with the side elements and provide smooth corner finish that for example covers the cut aluminium edges of the side profiles. The angle bracket can for example be made from zinc.

[0073] With four angled brackets, one at each joint between neighbouring side elements, the frame can be assembled in a secure and stable manner.

[0074] Furthermore, the frame can be secured to a wall by mounting screws (not shown) through a mounting flange 12 which extends from the back surface of the frame and abuts against the wall when arranging the frame thereon. Alternatively, or additionally, mounting brackets (not shown) can be inserted into a mounting groove 13 and used for also mounting the frame on the wall.

[0075] Figures 6 and 7 show a second embodiment of an acoustic panel 501 and a third embodiment of an acoustic panel 601 respectively. In the second and third embodiment the frame is larger than the standard sound absorbing element sizes and the second sound absorbing arrangement 503 is made up of three sound absorbing elements 531 , 532 and 533 and the third sound absorbing arrangement is made up of nine sound absorbing elements 631 , 632, 633, 634, 635, 636, 637, 638 and 639.

[0076] An array 700 of acoustic panels 701 , 702, 703, 704 and 705 is shown in one embodiment in Figure 8. The acoustic panels have different sizes and are all provided with a cover sheet with a customized print. The spacing between the acoustic panels is the same. As can be seen the array in the current embodiment forms a uniform visual appearance.

[0077] Reference signs first embodiment of an acoustic panel 1 frame 2 opening 3 sound absorbing arrangement 4 inner surface 5 two surface parts 5a and 5b of the inner surface protrusion 6 distal surface 6” of protrusion proximal surface 6’ of protrusion distal end 7 of the inner surface proximal end 8 of the inner surface back surface 9 recess 10 assembly groove 11 mounting flange 12 mounting groove 13 angled bracket 400 first flange 401 second flange 402 attachment holes 043, 404, 405, 406 corner member 407 first 21 , second 22, third 23 and fourth 24 side elements first 51 , second 52, third 53 and fourth 54 inner partial surfaces first 61 , second 62, third 63 and fourth 64 partial protrusions edge 31 of the sound absorbing element opening width woof the opening opening height hoof the opening opening thickness t0of the opening arrangement width waof the sound absorbing arrangement arrangement height haof the sound absorbing arrangement arrangement thickness taof the sound absorbing arrangement protrusion distance dpobtuse angle a retaining distance drbetween the back surface and the protrusion second embodiment of an acoustic panel 501 second sound absorbing arrangement 503 three sound absorbing elements 531 , 532 and 533 of the second sound absorbing arrangement third embodiment of an acoustic panel 601 third sound absorbing arrangement 603 nine sound absorbing elements 631 , 632, 633, 634, 635, 636, 637, 638 and 639 of the third sound absorbing arrangement array 700 acoustic panels 701 , 702, 703, 704 and 705 of the array

[0078] Embodiments

[0079] The following is a listing of exemplary embodiments of the disclosure.

[0080] 1 . An acoustic panel (1 ) comprising a frame (2) defining an opening (3) having an opening width w0, an opening height h0and an opening thickness t0and a sound absorbing arrangement (4) arranged in the opening (3) of the frame (2), where an inner surface (5) extending around the frame (2) defines the opening width w0and the opening height h0corresponding to the dimensions across the opening (3) and where the sound absorbing arrangement (4) comprises an arrangement width waand an arrangement height hacorresponding to the dimensions across the sound absorbing arrangement (4) and where the arrangement height haand arrangement width waare smaller than the corresponding opening height h0and opening width w0such that the absorbing arrangement (4) can be placed in the frame opening (3), wherein the inner surface (5) extends from a distal end (7) to a proximal end (8) along the opening thickness t0of the opening (3), and wherein the inner surface (5) further comprises a protrusion (6) extending from the inner surface (5) and extends at least partially around the opening (3) and where the protrusion (6) extends in a protrusion distance dpfrom the inner surface (5) such that at least a part of the dimensions between opposing protrusions (61 , 63; 62, 64) in the frame (2) are smaller than the corresponding arrangement width waand / or arrangement height ha.

[0081] 2. The acoustic panel (1) according to embodiment 1 , wherein the protrusion (6) extends from the inner surface (5) transverse to the thickness t0of the opening.

[0082] 3. The acoustic panel (1 ) according to embodiment 1 or embodiment 2, wherein a back surface (9) of the frame (2) extends from the distal end (7) of the inner surface (5) and where the back surface (9) extends in a back distance drfrom the inner surface (5), where the back distance is larger than the protrusion distance dp.

[0083] 4. The acoustic panel (1 ) according to embodiment 1 , 2 or 3, wherein a retaining distance drbetween the back surface (9) and protrusion (6) is equal to or larger than the thickness taof the sound absorbing arrangement (4).

[0084] 5. The acoustic panel (1 ) according to any one of the embodiments 1 - 4, wherein the protrusion (6) comprises a distal surface (6”) facing towards the distal end (7) of the inner surface (5) and where the distal surface (6”) extends perpendicular to the inner surface.

[0085] 6. The acoustic (1 ) panel according to any one of the embodiments 1 - 5, wherein the protrusion (6) comprises a proximal surface (6’) facing towards the proximal end (8) of the inner surface (5) and where the proximal surface (6’) extends at an obtuse angle a with the inner surface (5).

[0086] 7. The acoustic panel (1 ) according to any one of the embodiments 1 - 6, wherein the protrusion distance dp, is above 1 mm, in particular above 2 mm or between 1 and 7 mm, for example 2,25 mm.

[0087] 8. The acoustic panel (1 ) according to any one of the embodiments 1 - 7, wherein the thickness taof the sound absorbing arrangement (4) is between 10 mm and 100 mm, preferably between 30 mm and 50 mm, such as 33 mm to 44 mm and most preferred between 35 mm to 39 mm. 9. The acoustic panel according to any one of the embodiments 1 - 8, wherein the sound absorbing arrangement is made up of a plurality of sound absorbing elements.

[0088] 10. The acoustic panel (1 ) according to any one of the embodiments 1 - 9, wherein the frame (2) is a square frame comprising a first (21 ), a second (22), a third (23) and a fourth side element (24) wherein each side element comprises a respective first (51), second (52), third (53) and a fourth (54) inner partial surface, which together form the inner surface (5) defining the opening (3).

[0089] 11. The acoustic panel (1) according to embodiment 10, wherein the first (21 ), the second (22), the third (23) and the fourth side element (24) are extruded aluminium profiles.

[0090] 12. The acoustic panel (1 ) according to any one of the preceding embodiments wherein a recess (10) is arranged at the proximal end (8) of the inner surface (5), wherein the recess (10) extends transverse to the inner surface (5) and opens out away from the frame (2) and where the recess (10) extends around the frame (2).

[0091] 13. The acoustic panel (1 ) according to embodiment 12, wherein the acoustic panel further comprises a cover sheet comprising a cover height and a cover width corresponding to the distance between the recess (10) as it extends around the frame (2), and wherein the cover sheet further comprises at least one attachment element for fastening the cover sheet to the frame by connecting the at least one attachment element in the recess (10).

[0092] 14. An array of acoustic panels comprising at least two acoustic panels according to any one of the embodiments 1 - 13, arranged on a vertical surface such as a wall.

[0093] 15. A method of mounting an acoustic panel according to embodiment 1 - 13, wherein the frame is mounted vertically on a wall and fixed with fasteners, such as screws, wherein the sound absorbing arrangement is inserted into the frame by pushing it into the frame from the proximal end past the protrusion.

[0094] 16. A method according to embodiment 15, wherein a cover sheet is arranged over the frame such that it covers the sound absorbing arrangement.

Claims

Claims1 . A method of mounting an acoustic panel (1), wherein a frame (2) is mounted vertically on a wall and fixed with fasteners, such as screws, , wherein the acoustic panel (1 ) comprises the frame (2) defining an opening (3) having an opening width w0, an opening height h0and an opening thickness t0and the sound absorbing arrangement (4) is arranged in the opening (3) of the frame (2), where an inner surface (5) extending around the frame (2) defines the opening width w0and the opening height h0corresponding to the dimensions across the opening (3) and where the sound absorbing arrangement (4) comprises an arrangement width waand an arrangement height hacorresponding to the dimensions across the sound absorbing arrangement (4) and where the arrangement height haand the arrangement width waare smaller than the corresponding opening height h0and opening width w0such that the absorbing arrangement (4) can be placed in the frame opening (3), wherein the inner surface (5) extends from a distal end (7) to a proximal end (8) along the opening thickness t0of the opening (3), and wherein the inner surface (5) further comprises a protrusion (6) extending from the inner surface (5) and at least partially around the opening (3) and where the protrusion (6) extends in a protrusion distance dpfrom the inner surface (5) such that the dimensions between opposing protrusions (61 , 63; 62, 64) in the frame (2) are smaller than the corresponding arrangement width waand / or arrangement height ha, wherein the protrusion (6) comprises a proximal surface (6’) facing towards the proximal end (8) of the inner surface (5) and where the proximal surface (6’) extends at an obtuse angle a with the inner surface (5), and wherein the mounting of the acoustic panel (1 ) further comprises inserting the sound absorbing arrangement (4) into the frame (2) by pushing it into the opening (3) from the proximal end (8) past the protrusion (6).

2. The method according to claim 1 , wherein the protrusion (6) extends from the inner surface (5) transverse to the thickness t0of the opening (3).

3. The method according to claim 1 or claim 2, wherein a back surface (9) of the frame (2) extends from the distal end (7) of the inner surface (5) and where the back surface (9) extends in a back distance db from the inner surface (5), where the back distance db is larger than the protrusion distance dp.

4. The method according to claim 1 , 2 or 3, wherein a retaining distance drbetween the back surface (9) and protrusion (6) is equal to or larger than the thickness taof the sound absorbing arrangement (4).

5. The method according to any one of the claims 1 - 4, wherein the protrusion (6) comprises a distal surface (6”) facing towards the distal end (7) of the inner surface (5) and where the distal surface (6”) extends perpendicular to the inner surface (5).

6. The method according to any one of the claims 1 - 5, wherein the proximal surface (6”) is a curved surface and the obtuse angle a is a dynamic angle that starts at close to 180° at the inner surface (5) and gradually decreases towards 100° or below as the proximal surface extends towards the distal end (7) of the inner surface (5).

7. The method according to any one of the claims 1 - 6, wherein the protrusion distance dp, is above 1 mm, in particular above 2 mm or between 1 and 7 mm, for example 2,25 mm.

8. The method according to any one of the claims 1 - 7, wherein the thickness taof the sound absorbing arrangement (4) is between 10 mm and 100 mm, preferably between 30 and 50 mm, such as 33 mm to 41 mm and most preferred between 35 mm to 39 mm.

9. The method according to any one of the claims 1 - 8, wherein the sound absorbing arrangement is made up of a plurality of sound absorbing elements.

10. The method according to any one of the claims 1 - 9, wherein the frame (2) is a square frame comprising a first (21 ), a second (22), a third (23) and a fourth side element (24) wherein each side element comprises a respective first (51 ), second (52), third (53) and a fourth inner partial surface (54), which together form the inner surface (5) defining the opening (3).

11. The method according to claim 10, wherein the first (21 ), the second (22), the third (23) and the fourth side element (24) are extruded aluminium profiles.

12. The method according to any one of the preceding claims wherein a recess (10) is arranged at the proximal end (8) of the inner surface (5), wherein the recess (10) extends transverse to the inner surface (5) and opens out away from the frame (2) and where the recess (10) extends around the frame (2).

13. The method according to claim 12, wherein the acoustic panel (1 ) further comprises a cover sheet comprising a cover height and a cover width corresponding to the distance between the recess (10) as it extends around the frame (2) and wherein the cover sheet further comprises at least one attachment element for fastening the cover sheet to the frame (2) by connecting the at least one attachment element in the recess (10).

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