Muffling panel

Abstract

To provide a muffling panel that has excellent muffling performance and decorative properties and can be easily fabricated.SOLUTION: The muffling panel comprises: a flat substrate (10) made of highly compressed felt; and a corrugated panel (20) made of highly compressed felt, formed into a corrugated shape by bending along a cut-off portion and superimposed on one side of the substrate.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a soundproofing panel used as a noise countermeasure in ordinary homes, offices, etc. [Background technology]

[0002] In ordinary homes and offices, panelized sound-absorbing materials (so-called sound-absorbing panels) are sometimes installed on walls and ceilings as a noise countermeasure. For example, the sound-absorbing panel described in Patent Document 1 is made of a board material formed from highly compressed felt. Since highly compressed felt has many fine pores inside, when sound from the sound source enters, part of the sound energy is converted into heat energy due to friction between the inner walls of the pores and the air, and the sound is absorbed.

[0003] Since sound-absorbing panels arranged on walls and ceilings become part of the interior, they are required to be decorative as well as have sound-absorbing properties. Patent Document 1 proposes a sound-absorbing panel with a pattern formed by concaves and convexes. Patent Document 1 describes, as methods for forming concaves and convexes on a sound-absorbing panel, a method of attaching a die-cut part obtained by die-cutting a plate material into a predetermined shape to another plate material (so-called layer processing), a method of pressing a plate material while applying heat (so-called embossing), and a method of electrostatically printing a plate material using a fiber material or the like (so-called 3D printing processing). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3208847 Summary of the Invention [Problem to be solved by the invention]

[0005] Forming unevenness on the surface of a sound-absorbing panel is desirable not only from the viewpoint of decorativeness, but also from the viewpoint of improving sound deadening performance, since the unevenness of the surface causes sound waves to be diffusely reflected. Here, "sound deadening" in relation to panels, etc., includes not only "sound absorption" that absorbs sound, but also the reduction in the energy of sound waves returning to the source of the sound waves due to the diffuse reflection of the sound waves by the panel. However, in the sound-absorbing panel described in Patent Document 1, the effect of improving the sound deadening performance by forming the unevenness was not sufficient. Also, in the sound-absorbing panel in which the unevenness was formed by embossing, the pores inside the highly compressed felt were crushed, so there was a problem that the sound absorbing performance was reduced.

[0006] An object of the present invention is to provide a sound-absorbing panel having excellent sound-absorbing and decorative properties. [Means for solving the problem]

[0007] The first aspect of the sound-absorbing panel according to the present invention, which has been made to solve the above problems, is as follows: A flat substrate made of highly compressed felt; A corrugated plate made of highly compressed felt, formed into a corrugated shape by folding along the cut-off portion, and superimposed on one surface of the substrate; Equipped with.

[0008] The "cut-out portion" mentioned above refers to a portion of the plate material that is not completely cut off, but is cut off by 1 / 2 or more of its thickness from the other surface, leaving a portion of one surface uncut. This "cut-out portion" includes a "cut portion" in which the cut-off portion is not cut off, and a "removed portion" in which at least one of the cut-off portions is removed. The cut-out portion is typically a V-groove cut into a V-shape.

[0009] In the above sound-absorbing panel, the corrugated sheet can be simply folded along the cut-off portion to form a wavy uneven pattern. The above sound-absorbing panel with the uneven pattern has a larger surface area than a flat sound-absorbing panel, so it can absorb sound efficiently, and the sound waves from the sound source are diffusely reflected by the uneven pattern, so the energy of the sound waves returning to the sound source is reduced. In addition, when sound waves from the sound source enter the corrugated sheet, a part of the sound waves that have passed through the corrugated sheet is multiple-reflected in the cavity formed between the substrate and the corrugated sheet, and the energy is attenuated by interference, so that the sound can be effectively absorbed. Furthermore, in the above sound-absorbing panel, the pores of the highly compressed felt are not crushed when the uneven pattern is formed in the corrugated sheet, so the sound-absorbing performance of the corrugated sheet itself is not reduced.

[0010] In the above sound-absorbing panel, At least a portion of the cut-off portion is a resection portion, It is preferable that the corrugated sheet is bent so that opposing surfaces come into contact with each other at the cutout portion.

[0011] According to the above-mentioned configuration, since the opposing surfaces of the cutout portion come into contact with each other, the corrugated sheet cannot be bent any further, and the predetermined corrugated sheet shape can be reliably formed and maintained.

[0012] In the above sound-absorbing panel, The corrugated sheet has a plurality of parallel ridges, The cross-sectional shape of the peaks is preferably V-shaped, U-shaped, or semicircular.

[0013] According to the above configuration, the decorativeness of the sound-absorbing panel can be improved.

[0014] Furthermore, in the above sound-absorbing panel, It is preferable to provide flat valley portions between adjacent peaks.

[0015] According to the above-mentioned configuration, the valleys of the corrugated sheet and the substrate are in surface contact with each other, so that the corrugated sheet can be firmly fixed to the substrate.

[0016] In the above sound-absorbing panel, It is preferable to provide a unit side plate for closing an opening at a side end of each peak of the corrugated sheet that is generated when the base plate and the corrugated sheet are overlapped. It is also preferable to provide the unit side plate at each opening on both sides of each peak.

[0017] According to the above-mentioned configuration, sound that has entered the cavity formed between the substrate and the corrugated plate is less likely to leak out, and sound can be more effectively deadened (absorbed).

[0018] In the above sound-absorbing panel, A plurality of the corrugated sheets are stacked on one surface of one of the substrates so as to be continuously arranged at predetermined intervals in a direction parallel to the waves, The corrugated sheet may include a unit side plate for closing an opening at a side end of each peak of the corrugated sheet that is generated when the base plate and the corrugated sheet are overlapped.

[0019] According to the above configuration, the convex portion has a two-dimensional shape as a whole, so that decorativeness and sound-deadening performance are improved.

[0020] The second aspect of the sound-absorbing panel according to the present invention, which is made to solve the above problems, is as follows: A flat substrate made of highly compressed felt; a two-dimensional projection plate made of highly compressed felt and having a plurality of projections arranged two-dimensionally, the two-dimensional projection plate being superimposed on one surface of the substrate; Equipped with.

[0021] In the sound-absorbing panel having the above-mentioned configuration, the multiple protrusions are arranged two-dimensionally, which provides excellent decorativeness. In addition, the multiple protrusions arranged two-dimensionally reflect sound waves at various angles, which allows for efficient sound absorption.

[0022] The third aspect of the sound-absorbing panel according to the present invention, which is made to solve the above problems, is as follows: A flat substrate made of highly compressed felt; a single protruding plate made of highly compressed felt and having one protruding portion, superimposed on one surface of the base; Equipped with.

[0023] According to the sound-absorbing panel having the above configuration, by arranging a plurality of the sound-absorbing panels in a two-dimensional manner, a plurality of convex portions are arranged in a two-dimensional manner, so that the sound-absorbing panel can absorb sound as efficiently as the sound-absorbing panel according to the second aspect. Effect of the Invention

[0024] According to the present invention, it is possible to provide a soundproofing panel having excellent soundproofing and decorative properties. [Brief description of the drawings]

[0025] [Figure 1] 1 is a perspective view of a sound-absorbing panel according to a first embodiment of the present invention. [Diagram 2] A portion of a cross-sectional view of the above sound-absorbing panel along the A-A' section. [Diagram 3] FIG. 4 is a diagram showing a corrugated sheet of the sound-absorbing panel in a state before being folded. [Figure 4] FIG. 4 is a perspective view of a jig used to manufacture the above sound-absorbing panel. [Diagram 5] 4A to 4C are diagrams illustrating a procedure for producing the sound-absorbing panel. [Figure 6] 1 is a graph showing the sound absorption coefficients of the sound-damping panel according to the first embodiment of the present invention (specimen 1) and conventional sound-absorbing panels (specimens 2 to 4). [Figure 7] FIG. 4 is a perspective view of a sound-absorbing panel according to a first modified example of the first embodiment. [Figure 8] A portion of a cross-sectional view of the above sound-absorbing panel along the B-B' section. [Figure 9] FIG. 4 is a diagram showing a corrugated sheet of the sound-absorbing panel in a state before being folded. [Figure 10] FIG. 11 is a perspective view of a sound-absorbing panel according to a second modified example of the first embodiment. [Figure 11] A portion of a cross-sectional view of the above sound-absorbing panel at the C-C' section. [Figure 12] FIG. 4 is a diagram showing a corrugated sheet of the sound-absorbing panel in a state before being folded. [Figure 13]13A is a partial cross-sectional view of a sound-absorbing panel according to another modified example 1 of the first embodiment, and FIG. 13B is a view showing a corrugated sheet before being folded. [Figure 14] 13A is a partial cross-sectional view of a sound-absorbing panel according to another modified example 2 of the first embodiment, and FIG. 13B is a view showing a corrugated sheet in a state before being folded. [Figure 15] 13A is a partial cross-sectional view of a sound-absorbing panel according to another modified example 3 of the first embodiment, and FIG. 13B is a view showing a corrugated sheet before being folded. [Figure 16] 13 is a diagram showing the internal state of a sound-absorbing panel in which unit side panels and partition panels are arranged. FIG. [Figure 17] FIG. 2 is a diagram showing an example of a sound-absorbing panel having one ridge portion 20 in the first embodiment. [Figure 18] FIG. 5 is a perspective view of a sound-absorbing panel according to a second embodiment of the present invention. [Figure 19] FIG. 2A is an overall view showing a one-dimensional convex plate in the sound-absorbing panel, and FIG. [Figure 20] 4A to 4C are diagrams illustrating a procedure for producing the sound-absorbing panel. [Figure 21] FIG. 11 is a perspective view of a sound-absorbing panel according to a third embodiment of the present invention; [Figure 22] 2A is an overall view showing a single convex plate in the sound-absorbing panel, and FIG. 2B is an exploded perspective view thereof. [Figure 23] FIG. 4 is a diagram showing the internal state of the sound-absorbing panel. [Figure 24] A diagram showing multiple sound-absorbing panels arranged side by side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0027] First Embodiment (Sound-absorbing panel configuration) Fig. 1 is a perspective view of a sound-absorbing panel 1 according to a first embodiment of the present invention, and Fig. 2 is a partial cross-sectional view taken along line A-A' of the sound-absorbing panel 1. The sound-absorbing panel 1 has one substrate 10 and one corrugated sheet 20 superimposed on one surface of the substrate 10.

[0028] The substrate 10 is a rectangular flat plate made of highly compressed felt. The "highly compressed felt" referred to here is also called "high density felt" and is specifically a felt made of polyester or other fibers that has been highly compressed to a high density (specifically, a density of 140 kg / m 3 ~280kg / m 3 It is a felt with a softness of about 100%.

[0029] The corrugated sheet 20 is made of the highly compressed felt and comprises a number of peaks 22 that are V-shaped in cross section, a number of flat valleys 23 that connect adjacent peaks 22, and flat end portions 24 that extend outside the peaks 22 at both ends. Each peak 20 has the same shape and dimensions, and each valley 21 has the same dimensions. The peaks 22 and valleys 23 have approximately the same width. Furthermore, the two end portions 24 have the same dimensions, and the width of each end portion 24 is approximately half the width of the valley portions 23. The corrugated sheet 20 is formed by bending a sheet material 21, which is a rectangular flat plate made of highly compressed felt.

[0030] FIG. 3 is a diagram showing the corrugated sheet 20 (sheet material 21) before being folded. In the sheet material 21, a slit (the "cut portion") 211, a V-groove (the "removed portion") 213, and a slit (the "cut portion") 212 are provided on the same surface at a predetermined interval, in that order from the left, and these are repeatedly provided thereafter. In this embodiment, the V-groove 213 is provided at a position that bisects the space between the slits 211 and 212. The angle formed by the opposing surfaces of the V-groove is, for example, 60° to 120°. The slits 211, 212, and the V-groove 213 are provided on the surface of the sheet material 21 that abuts against the substrate 10, so as to cross two opposing sides. The corrugated sheet 20 shown in FIG. 2 is formed by folding the sheet material 21 so as to open the slits 211, 212 and close the V-groove 213 (so that the opposing surfaces of the V-groove abut against each other). The slits 211 and 212 correspond to the grooves 25 and 26 of the corrugated sheet 20, respectively, and the V-shaped groove 213 corresponds to the abutment portion 27.

[0031] The thickness d1 of the substrate 10 and the thickness d2 of the corrugated sheet 20 (sheet material 21) are not particularly limited, but are preferably 9 mm or more and 12 mm or less. By making the thicknesses d1 and d2 9 mm or more, the distance that the sound from the sound source passes through the highly compressed felt constituting the substrate 10 and the corrugated sheet 20 is sufficiently maintained, and sound deadening (sound absorption) can be ensured. Furthermore, the highly compressed felt having a thickness of 9 mm or more is excellent not only in sound deadening (sound absorption) properties but also in cushioning properties and heat insulation properties, so that the safety and heat retention of the room can be improved. In addition, by making the thicknesses d1 and d2 12 mm or less, the sound deadening panel 1 is prevented from becoming too heavy and the installation location is prevented from being limited. The thickness d1 of the substrate 10 and the thickness d2 of the sheet material 21 may be the same or different. For example, the thickness d1 of the substrate 10 and the thickness d2 of the sheet material 21 of the corrugated sheet 20 can both be 9 mm.

[0032] In the soundproof panel 1, a hollow portion 30 is formed inside the peak portion 22. The hollow portion 30 is a space formed by the substrate 10 and the peak portion 22 of the corrugated sheet 20. The maximum value of the opposing distance between the substrate 10 and the corrugated sheet 20 in the hollow portion 30 (hereinafter referred to as the "maximum opposing distance") d3 is not particularly limited, but is preferably 20 mm or more. By setting the maximum opposing distance d3 of the hollow portion 30 to 20 mm or more, a part of the sound transmitted through the corrugated sheet 20 is sufficiently attenuated by interference within the hollow portion 30, and sound can be more reliably silenced (absorbed). In addition, the maximum opposing distance d3 is preferably 80 mm or less. By setting the maximum opposing distance d3 to 80 mm or less, the thickness of the soundproof panel 1 does not become too large, and the installation location or storage location is less likely to be restricted.

[0033] (How to make soundproof panels) An example of a procedure for producing the soundproofing panel 1 according to the first embodiment will be described with reference to the drawings. Fig. 4 is a diagram showing a jig T used for producing the soundproofing panel 1, and Fig. 5 is a diagram explaining the procedure for producing the soundproofing panel 1 using the jig T.

[0034] The jig T is, for example, a thick plate made of highly compressed felt, and has a plurality of recesses T1 corresponding to the peaks 22 of the corrugated plate 20. First, the creator of the sound-absorbing panel 1 places the plate material 21 on the jig T as shown in FIG. 5. At this time, the surface on which the slits 211, 212 and the V-groove 213 are provided is placed upward. The plate material 21 is then folded along the slits 211, 212 and the V-groove 213 so that the V-groove 213 is positioned at the position of the recesses T1. In this way, the plate material 21 is held in a corrugated shape along the shape of the jig T.

[0035] With the plate material 21 held in a corrugated shape, the creator applies adhesive to the surfaces of the corrugated plate 20 that correspond to the valley portions 23 and ends 24 (areas indicated by hatching in FIG. 5). For example, the adhesive is a hot melt adhesive, which can be applied using a glue gun. The creator then places the substrate 10 on the plate material 21 to which the adhesive has been applied, and bonds the plate material 21 and the substrate 10 together. In this manner, the plate material 21 is fixed to the substrate 10 as the corrugated plate 20, and the soundproof panel 1 is produced. Since the valley portions 23 of the soundproof panel 1 of this embodiment are flat, the corrugated plate 20 can be firmly fixed to the substrate 10.

[0036] (How sound-absorbing panels are used) The soundproofing panel 1 produced as described above is attached to a wall or ceiling so that the corrugated sheet 20 faces the sound source. When attaching the soundproofing panel 1 to a wall, for example, a pin can be used. If a thin pin such as a pin is used, the soundproofing panel 1 can be attached without damaging the wall. Alternatively, tape or the like (for example, masking tape) may be attached to the wall or the like in advance so as not to damage the wall, and then adhesive (for example, hot melt adhesive) or a pressure sensitive adhesive may be applied to the tape to attach the soundproofing panel 1. Alternatively, for example, a hook-and-loop fastener, a hook, a magnet, or the like may be used for attachment.

[0037] When it is desired to arrange the soundproofing panels 1 in a relatively wide surface area, it is sufficient to arrange a plurality of soundproofing panels 1 in the surface area without any gaps. If each soundproofing panel 1 is made relatively small in size and a plurality of soundproofing panels 1 are arranged in a row in a wide surface area, it becomes possible to flexibly deal with various surface areas of different sizes and shapes. In addition, since the weight of each soundproofing panel is sufficiently light, the work of attaching each soundproofing panel 1 to a wall or the like becomes easy. For example, it is preferable that the soundproofing panel 1 has a rectangular shape with a side length of 200 mm to 800 mm in a plan view (particularly preferably, a square shape with a side length of 600 mm).

[0038] When multiple soundproofing panels 1 are arranged, the soundproofing panels 1 can be arranged with the orientation (the direction in which the peaks 22 and valleys 23 extend) aligned. This allows the uneven pattern of the peaks 22 and valleys 23 to be continuous between adjacent soundproofing panels 1. If the width of the end 24 of the corrugated sheet 20 is set to approximately half the width of the valleys 23, when the soundproofing panels 1 are arranged so that the ends 24 are connected, the width of the two consecutive ends 24 between adjacent soundproofing panels 1 and the width of the valleys 23 become approximately equal, and the uneven pattern has more continuity. In addition, for example, it is also possible to arrange the peaks 22 and valleys 23 of all adjacent soundproofing panels 1 so that their orientations are different (alternately arranged vertically and horizontally) to create a checkerboard pattern. In addition, multiple soundproofing panels 1 can be arranged in various ways to form various patterns and change the impression of the interior.

[0039] As described above, the sound-absorbing panel 1 according to this embodiment can be easily produced by bending the plate material 21 along the slits 211, 212 and V-groove 213 and pasting it onto the substrate 10. The sound-absorbing panel 1 has a pattern formed by projections and recesses, and is highly decorative. Since the plate material 21 of the sound-absorbing panel 1 is made of highly compressed felt, it is easy to form the slits 211, 212 and V-groove 213 in the plate material 21 and to fold the plate material 21.

[0040] The sound-absorbing panel 1 with the uneven pattern has a larger surface area than that of a flat plate, and therefore can absorb sound efficiently. In addition, the uneven surface causes the sound waves to be diffused, and the reflected sound is attenuated. Since the plate material 21 has the slits 211, 212, and the V-groove 213, excessive pressure is not applied to the parts folded at the slits 211, 212, and the V-groove 213, and the pores inside the highly compressed felt are not crushed, and the sound-absorbing (sound-absorbing) performance of the corrugated plate itself is not reduced. Furthermore, in the sound-absorbing panel 1, a part of the sound transmitted through the corrugated plate 20 is multiple-reflected in the cavity 30 formed inside the peaks 22, and the energy is attenuated by interference, so that the sound can be absorbed more effectively.

[0041] Furthermore, the soundproofing panel 1 according to this embodiment is bent so that opposing surfaces abut against each other at the V-groove 213. This allows the opposing surfaces to act as stoppers and prevent the plate material 21 from being bent any further, so that the shape of the soundproofing panel 1 can be reliably formed and maintained.

[0042] (Evaluation of sound absorption performance) The sound absorption performance of the sound-absorbing panel 1 according to this embodiment was evaluated by a reverberation room sound absorption coefficient measurement according to JIS A1409 at the Fukui Prefectural Industrial Technology Center. 3 , length x width dimensions: 600 mm x 597 mm, thickness of substrate 10 (d1): 9 mm, thickness of plate material 21 of corrugated plate 20 (d2): 9 mm, maximum opposing distance between substrate 10 and corrugated plate 20 in cavity 30 (d3): 25 mm) (test specimen 1) was placed in a reverberation chamber (volume: 38.9 m 3 , Surface area: 68.3m 2 16 panels (4 vertical x 4 horizontal, floor area 5.76 m) on the wall 2 ) were lined up and the sound absorption coefficient was measured in the range of 100 to 10,000 Hz (1 / 3 octave band) using a steady sound pressure generator. For comparison, a conventional sound absorbing panel consisting of a single flat sheet of highly compressed felt with a thickness of 9 mm (density of highly compressed felt: 144 kg / m 3 , length x width dimensions: 600 mm x 597 mm) (test piece 2), a conventional sound-absorbing panel consisting of a single flat sheet of highly compressed felt with a thickness of 12 mm (density of highly compressed felt: 183 kg / m 3 , length x width dimensions: 600 mm x 597 mm) (test piece 3), and a conventional sound-absorbing panel (density of high-compression felt: 144 kg / m) made by pasting a die-cut part made of a 9 mm-thick flat sheet of high-compression felt on part of one side of the sheet. 3 , length x width: 400 mm x 400 mm) (test specimen 4) was placed in a reverberation room (volume: 38.9 m 3 , Surface area: 68.3m 2 36 panels (6 vertical x 6 horizontal, floor area 6.00 m) on the wall 2 ) and the sound absorption coefficient was measured under the same conditions as above.

[0043] 6 is a graph showing the sound absorption coefficients of the sound-proof panel 1 according to this embodiment (specimen 1) and conventional sound-absorbing panels (specimens 2 to 4). In the frequency range of 1.25 kHz or less, the sound absorption coefficient of specimen 1 was higher than that of specimens 2 to 4. Moreover, specimen 1 showed a good sound absorption coefficient in the mid-range (800 Hz to 2 kHz) that is most easily recognized by people in daily life.

[0044] The sound-absorbing panel 1 according to the first embodiment has been described above, but the cross-sectional shape of the peaks 22 of the corrugated sheet 20 of the sound-absorbing panel 1 can be modified in various ways. Below, modified examples of the first embodiment will be described with reference to Figs. 7 to 12. Note that the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted.

[0045] (Variation 1) Fig. 7 is a perspective view of the soundproof panel 1 according to the first modification of the first embodiment, and Fig. 8 is a part of a cross-sectional view taken along the line B-B' in Fig. 7. Fig. 9 is a view showing the corrugated sheet 20 (sheet material 21) before being folded. In the soundproof panel 1 of the first modification, the peaks 22 of the corrugated sheet 20 are U-shaped in cross section. As shown in Fig. 9, the sheet material 21 has slits 211 and 212 at a predetermined interval. Between the slits 211 and 212, two V-shaped grooves 213 are provided at equal distances from the slits 211 and 212, respectively. The angle between the opposing faces of the V-shaped groove 213 is, for example, 90 degrees.

[0046] (Variation 2) Fig. 10 is a perspective view of a soundproof panel 1 according to Modification 2 of the first embodiment, and Fig. 11 is a part of a cross-sectional view taken along the line CC' in Fig. 10. Fig. 12 is a diagram showing the corrugated sheet 20 (sheet material 21) before being folded. In the soundproof panel 1 of Modification 2, the peaks 22 of the corrugated sheet 20 are semicircular in cross section. As shown in Fig. 12, the sheet material 21 has slits 211, 212 provided at a predetermined interval, and a plurality of V-shaped grooves 213 are provided at equal intervals between the slits 211 and 212.

[0047] In the sound-absorbing panel 1 according to the first embodiment, the plate material 21 has the slits 211, 212, and the V-shaped groove 213 is provided between the slits 211 and 212, but the form and position of the cut-off portion are not limited to this and may be changed as appropriate. Other modified examples of the first embodiment will be described below with reference to Figs. 13 to 15.

[0048] (Other Variation 1) In the sound-absorbing panel 1 shown in Fig. 13(b), a slit 216 is provided between the V-grooves 214, 215. In this case, the V-grooves 214, 215 and the slit 216 are provided on the surface of the plate material 21 opposite to the surface that abuts against the substrate 10. The corrugated plate 20 shown in Fig. 13(a) is formed by bending the plate material 21 shown in Fig. 13(b) along the V-grooves 214, 215 and the slit 216. The slit 216 corresponds to the tops of the peaks 22. (Other Variation 2)

[0049] In the sound-absorbing panel 1 shown in Fig. 14(b), all of the cut-out portions are made of cuts (cuts 217, 218, 219). In this case, the cuts 217, 218 between the portions corresponding to the peaks 22 of the corrugated sheet 20 and the portions corresponding to the ends 24 or valleys 23, and the cut 219 in the portion corresponding to the peaks 22 are provided on different surfaces of the sheet material 21. The sheet material 21 shown in Fig. 14(b) is folded along the cuts 217, 218, 219 to form the corrugated sheet 20 shown in Fig. 14(a).

[0050] (Other Variation 3) In the sound-absorbing panel 1 shown in Fig. 15(b), all of the cut-out portions are formed of V-grooves (V-grooves 2110, 2111, 2112). In this case, the V-grooves 2110, 2111 between the portions corresponding to the peaks 22 of the corrugated sheet 20 and the portions corresponding to the ends 24 or valleys 23, and the slits 2112 in the portions corresponding to the peaks 22 are provided on different faces of the sheet material 21. The sheet material 21 shown in Fig. 15(b) is folded along the V-grooves 2110, 2111, 2112 to form the corrugated sheet 20 shown in Fig. 15(a).

[0051] In the sound-absorbing panel 1 according to the first embodiment, the openings at the side ends of each peak 22 of the corrugated sheet 20 (preferably the openings at both ends) that are generated when the substrate 10 of the sound-absorbing panel 1 and the corrugated sheet 20 are overlapped may be closed by a unit side plate 40 made of highly compressed felt. This makes it difficult for sound waves that have entered the cavity 30 to leak, and more effective sound absorption (deadening) can be achieved. For example, as shown in FIG. 16, the openings can be closed by embedding a unit side plate 40 of the same shape and size as the openings at the side ends of the sound-absorbing panel 1. Also, as shown in FIG. 19(b) to be described later, the openings at the side ends may be closed by attaching a unit side plate 40 having a shape that combines the openings at the side ends of the corrugated sheet 20 and the side end faces of the peaks 22 of the corrugated sheet 20 to the side end faces of the peaks 22 of the corrugated sheet 20. In this case, it is preferable to chamfer the side end faces of the unit side plate 40 and the peaks 22 of the corrugated sheet 20. In a sound-absorbing panel 1 provided with a unit side plate 40 as shown in Fig. 16 or Fig. 19(b), the corrugated plate 20 is supported by the unit side plate 40. Therefore, by providing the unit side plate 40, not only is the sound-absorbing performance improved, but the strength of the sound-absorbing panel 1 (particularly the sound-absorbing panel 1 in which the peak portions 22 of the corrugated plate 20 are U-shaped or semicircular in cross section) is also improved.

[0052] 16, the sound-absorbing panel 1 according to the first embodiment may have one or more partition plates 50 disposed in the cavity 30 of the sound-absorbing panel 1, dividing the cavity 30 in a direction parallel to the waves of the corrugated plate 20. This allows sound waves to interfere with each other in each divided cavity of the cavity 30, thereby attenuating sound energy, thereby enabling efficient sound-absorbing (sound-absorbing) effects. In addition, the corrugated plate 20 is supported by the partition plates 50, thereby improving the strength of the sound-absorbing panel 1.

[0053] In addition, in the above embodiment, the multiple peaks 22 are all the same shape and size, but for example, one soundproof panel 1 may have peaks 22 of various shapes (V-shaped, U-shaped, semicircular), or each peak 22 may have the same shape but different dimensions. In the above embodiment, the widths of the peaks 22 and the valleys 23 are approximately equal, but they may be different. In the above embodiment, the corrugated sheet 20 has multiple peaks 22, but for example, as shown in FIG. 17, there may be only one peak 22. In that case, it is preferable to provide the unit side plate 40 and partition plate 50 described above from the viewpoint of improving soundproofing performance and strength. The partition plate 50 may be arranged in a lattice pattern.

[0054] <Second embodiment> Next, a sound-absorbing panel 1A according to a second embodiment of the present invention will be described with reference to Figures 18 to 20. Note that detailed descriptions of parts that are the same as or equivalent to those in the first embodiment will be omitted.

[0055] 18 is a perspective view of a soundproof panel 1A according to a second embodiment of the present invention. The soundproof panel 1A includes one substrate 10a, three one-dimensional convex plates 200 overlapped so as to be consecutively provided at a predetermined interval on one surface of the substrate 10a, and two gap plates 60 arranged between the one-dimensional convex plates 200. The one-dimensional convex plate 200 has three convex portions 22a arranged in one row (one-dimensionally).

[0056] (One-dimensional convex plate) Fig. 19(a) is a perspective view showing the entire one-dimensional protruding plate 200, and Fig. 19(b) is an exploded perspective view thereof. The one-dimensional protruding plate 200 is composed of a corrugated plate 20a formed by bending a plate material 21a made of a long, highly compressed felt with a predetermined width at a cut-off portion in the same manner as in the first embodiment, and a unit side plate 40a made of highly compressed felt and closing the openings at both ends of the crests 22a of the corrugated plate 20a that are generated when the substrate 10a and the corrugated plate 20a are overlapped. The unit side plate 40a has a shape that combines the openings at the side ends of the corrugated plate 20a and the side end faces 221 of the crests 22a of the corrugated plate 20a. The one-dimensional protruding plate 200 is formed by bonding the unit side plate 40a to both end faces 221 of the corrugated plate 20a. In this case, if both side end faces 221 of the corrugated plate 20a and the portions of the unit side plate 40a abutting against the both side end faces 221 are made into inclined surfaces inclined inward at a predetermined angle (preferably 45 degrees) (so-called chamfering), the unit side plate 40a can be placed inside the corrugated plate 20a, improving the appearance of the sound-absorbing panel 1A.

[0057] (Gap plate) The gap plate 60 is a rectangular flat plate made of highly compressed felt and has the same dimensions as the area of ​​the substrate 10a where the one-dimensional convex plate is not overlapped. The thickness of the gap plate 60 is preferably the same as the thickness of the highly compressed felt of the corrugated plate 20a.

[0058] (How to make soundproof panels) Fig. 20 is a diagram illustrating an example of a procedure for producing a soundproof panel 1A according to a second embodiment of the present invention using a jig T. First, a manufacturer of the soundproof panel 1A places a predetermined number of plate materials 21a (three in Fig. 20) at predetermined intervals on the jig T, and forms each plate material 21a into a corrugated shape in the same manner as in the first embodiment.

[0059] With each plate material 21a held in a corrugated state, the creator applies adhesive to the surfaces of the corrugated plate 20a that correspond to the valleys 23a and ends 24a (areas shown by hatching in FIG. 20). Next, the creator places the substrate 10a on each plate material 21a to which the adhesive has been applied, and bonds the plate materials 21a and the substrate 10a together. In this way, each plate material 21a is fixed to the substrate 10a as the corrugated plate 20a.

[0060] Next, the fabricator uses an adhesive to attach the unit side panels 40 to both side end faces 221 of each corrugated plate 20a. In this manner, the one-dimensional protruding plate 200 is fixed to the substrate 10a.

[0061] Finally, the fabricator applies adhesive to the areas of the substrate 10a that are exposed between the one-dimensional convex plates 200, overlaps the gap plate 60, and bonds the substrate 10a and the gap plate 60 together.

[0062] In the above-mentioned method, after a plurality of corrugated sheets 20a are attached to the substrate 10a with a predetermined interval therebetween, the gap sheets 60 are attached between each of the corrugated sheets 20a, but it is also possible to alternately place the plate materials 21a and the gap sheets 60 on the jig T, apply adhesive to the surfaces corresponding to the valleys 23a and the ends 24a of the corrugated sheets 20a and to the gap sheets 60, and then place the substrate 10a on top of the adhesive, thereby attaching the plate materials 21a and the gap sheets 60 to the substrate 10a. In this way, it becomes easier to consecutively install the plate materials 21a (corrugated sheets 20a) with a predetermined interval therebetween.

[0063] The sound-absorbing panel 1A manufactured as described above has excellent decorativeness because the multiple protrusions 22a are arranged two-dimensionally. In addition, the multiple protrusions 22a arranged two-dimensionally reflect sound waves at various angles, so that the sound generated from the sound source can be efficiently absorbed. In the sound-absorbing panel 1A, like the sound-absorbing panel 1 according to the first embodiment, a part of the sound transmitted through the corrugated sheet 20a is multiple-reflected in the cavity 30 formed inside the peaks 22, and the energy is attenuated by interference, so that the sound can be effectively absorbed. Furthermore, since the corrugated sheet 20a is formed by folding at the cut-off portion, excessive pressure is not applied to the folded portion, and the pores inside the highly compressed felt are not crushed, so that the sound-absorbing (sound-absorbing) performance of the corrugated sheet itself is not reduced.

[0064] (Modification) The sound-absorbing panel 1A has three one-dimensional convex plates 200 and two gap plates 60, but the number of these plates is not particularly limited as long as the convex parts 22a are arranged two-dimensionally. In the sound-absorbing panel 1A, a rectangular flat plate made of highly compressed felt may be further arranged on the outside of the one-dimensional convex plates 200 arranged at both ends. The width of this rectangular flat plate in the direction parallel to the waves of the corrugated plate 20 is preferably approximately half the width of the gap plate 60 in the same direction. In this way, when the sound-absorbing panels 1A are arranged so that the rectangular flat plates are connected, the width of the two continuous rectangular flat plates between the adjacent sound-absorbing panels 1 and the width of the gap plate 60 become approximately equal, and the two-dimensional uneven pattern has continuity.

[0065] In the above sound-absorbing panel 1A, the one-dimensional convex plate 200 is formed by bonding the unit side plate 40a to the corrugated plate 20a, but the corrugated plate 20a and the unit side plate 40a of the one-dimensional convex plate 200 may be integrally formed from a single sheet of highly compressed felt. In addition, in the above sound-absorbing panel 1A, the one-dimensional convex plate 200 and the gap plate 60 are separately superimposed on the substrate 10a, but the corrugated plate 20a and the unit side plate 40a of the one-dimensional convex plate 200, and the gap plate 60 may be integrally formed from a single sheet of highly compressed felt and superimposed on the substrate 10a. In this case, the corrugated plate 20a and the unit side plate 40a of the one-dimensional convex plate 200, and the gap plate 60 correspond to the two-dimensional convex plate in the present invention.

[0066] <Third embodiment> Next, a sound-absorbing panel 1B according to a third embodiment of the present invention will be described. Fig. 21 is a perspective view of the sound-absorbing panel 1B according to the third embodiment of the present invention. The sound-absorbing panel 1B includes a single substrate 10b and a single convex plate 70 superimposed on one surface of the substrate 10b.

[0067] (single convex plate) FIG. 22(a) is an overall perspective view of the single convex plate 70, and FIG. 22(b) is an exploded perspective view thereof. The single convex plate 70 is made of highly compressed felt and is composed of one convex part in the shape of a truncated quadrangular pyramid. As shown in FIG. 22(b), the single convex plate 70 is composed of a convex member 71 having a substantially U-shaped cross section, and a unit side plate 40b that closes the openings at both ends of the convex member 71 that are generated when the substrate 10b and the convex member 71 are overlapped. The convex member 71 is formed by bending a plate material (not shown) that is connected so that two pyramidal surfaces that contact the two opposing sides of the upper base of the truncated quadrangular pyramid of the single convex plate 70 become flat, and a V-shaped groove is provided at the bent portion of the plate material. The unit side plate 40b is attached to both end faces 711 of the convex member 71 to form the single convex plate 70. Both side end faces 711 of the protruding member 71 and the portions of the unit side plate 40b that come into contact with the both side end faces 711 are chamfered in the same manner as in the second embodiment. In addition, the portions of the protruding member 71 and the unit side plate 40b that come into contact with the substrate 10b are also chamfered.

[0068] 23 is a diagram showing the internal state of the sound-absorbing panel 1B. In the cavity formed between the substrate 10b and the single convex plate 70 of the sound-absorbing panel 1B, partition plates 50b are arranged in a lattice pattern.

[0069] 24 is a diagram showing a state where a plurality of soundproofing panels 1B are arranged. By arranging a plurality of soundproofing panels 1B without any gaps, a wall surface is formed with two-dimensional convex portions, improving soundproofing and decorativeness.

[0070] (Modification) In the soundproof panel 1B, the single convex plate 70 may be formed by integrally molding the convex member 71 and the unit side plate 40b. Also, a flat plate may be extended on the outer periphery of the convex portion of the single convex plate 70. The shape of the convex portion of the single convex plate 70 is not limited to a truncated quadrangular pyramid, and may be various shapes such as a triangular prism, a quadrangular prism, or a kamaboko shape. [Explanation of symbols]

[0071] 1, 1A, 1B...Sound-absorbing panel 10, 10a, 10b...Substrate 20, 20a...Corrugated sheet 21, 21a...Plate material 22, 22a…Yamabe 23, 23a…Tanibe 24, 24a...end 211, 212...gap 213...V groove 30...Cavity part 40, 40a, 40b...Unit side plate 50, 50b…Partition plate 60…Gap plate 70...Single convex plate 200...One-dimensional convex plate

Claims

1. A flat substrate made of highly compressed felt; A corrugated plate made of highly compressed felt, formed into a corrugated shape by folding along the cut-off portion, and superimposed on one surface of the substrate; A sound-absorbing panel.

2. At least a portion of the cut-off portion is a resection portion, 2. The sound-absorbing panel according to claim 1, wherein the corrugated sheet is folded so that opposing surfaces of the cutout portion come into contact with each other.

3. The corrugated sheet has a plurality of parallel ridges, 3. The sound-absorbing panel according to claim 1, wherein the cross-sectional shape of the peaks is V-shaped, U-shaped or semicircular.

4. 4. The sound-absorbing panel according to claim 3, further comprising flat plate-shaped valley portions between adjacent peak portions.

5. The sound-absorbing panel according to claim 1 or 2, further comprising unit side plates for closing openings at side ends of each peak of the corrugated sheet that are generated when the base plate and the corrugated sheet are overlapped.

6. A plurality of the corrugated sheets are stacked on one surface of one of the substrates so as to be continuously arranged at predetermined intervals in a direction parallel to the waves, The sound-absorbing panel according to claim 1 or 2, further comprising unit side plates for closing openings at side ends of each peak of the corrugated sheet that are generated when the base plate and the corrugated sheet are overlapped.

7. A flat substrate made of highly compressed felt; a two-dimensional projection plate made of highly compressed felt and having a plurality of projections arranged two-dimensionally, the two-dimensional projection plate being superimposed on one surface of the substrate; A sound-absorbing panel.

8. A flat substrate made of highly compressed felt; a single protruding plate made of highly compressed felt and having one protruding portion, superimposed on one surface of the base; A sound-absorbing panel.

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