JP2001081878A - Sound absorbing and acoustic panels - Google Patents

Abstract

(57) [Abstract] [Problem] To have a suitable structural strength as an interior material of a building, exhibit a sound absorbing effect in a wide range of sound, obtain a sense of unity as an interior, and reduce costs by simple construction. To provide a lightweight and inexpensive sound absorbing panel that can be used. A plate-shaped paper honeycomb core formed by a plurality of cells, a plate-shaped back liner paper adhered to the back surface of the paper honeycomb core, a cut surface of the paper honeycomb core, and the back liner It comprises a long member 40 bonded to both papers, and a gas-permeable, plate-like surface member 30 bonded to both the surface of the paper honeycomb core and the long member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound-absorbing panel which is used, for example, as an interior finishing material of a building and absorbs sound, and an acoustic panel which absorbs sound and blocks sound propagation.

[0002]

2. Description of the Related Art Conventionally, there has been known a sound absorbing panel used for the purpose of controlling room acoustics and preventing noise. This sound absorbing panel is formed by forming a sound absorbing material made of a porous material such as glass wool, rock wool, or curtain fabric into a plate shape or a sheet shape.

[0003] Among such porous materials, the thickness is 5 m.
A thin layer having a thickness of less than about m exhibits a sound absorbing effect in a wide sound range only when an air layer is formed behind the thin layer. Therefore, even if a sound absorbing panel made of a thin porous material is directly attached to a base material as an interior material of a building, no sound absorbing effect is exhibited. Therefore, conventionally, a frame is formed on a base to form an air layer behind the sound absorbing panel, and the sound absorbing panel is mounted on the frame.

[0004] By the way, sound absorbing panels made of rock wool are mainly used as ceiling materials. This sound absorbing panel
Usually, it is formed into a rectangular shape with a size convenient for handling, and a so-called sane (real) is formed on the surrounding cut surface to fit with another sound absorbing panel, and the surface is painted. I have. The sound absorbing panel made of glass wool is formed into a rectangular shape having a size convenient for handling after the hardness is increased by impregnating the glass wool with a resin. Also in this case, a cut is formed on a cut surface around the sound absorbing panel, and a breathable cloth is adhered to the surface.

On the other hand, as a building material, a sound insulation panel used for the purpose of blocking sound propagation is known. This sound insulation panel is used in a partition wall or a unit room of a building, and is finished by wallpaper or painting. As a method of forming a sound insulating panel, a method of attaching a sound insulating material such as a gypsum board, a sound insulating sheet on a framed construction site,
There is known a method of attaching a product, which has been processed into a panel of an appropriate size in advance at a factory, with a fastener.

As a panel used for heat insulation and soundproofing, for example, Japanese Patent Laid-Open No. 7-1619 discloses a method of manufacturing a panel in which a honeycomb core plate is attached to both sides of an elastic plate. Further, Japanese Patent Application Laid-Open No. Hei 5-79107 (Patent No. 2561588) discloses a partition panel in which a gypsum board is attached to both sides of a paper core. Further, Japanese Patent Application Laid-Open No. 5-263483 discloses a soundproof heat insulating panel in which a heat insulating material is adhered to one surface of a partition plate and a sound insulating material having a honeycomb structure is adhered to the other surface.

[0007]

The porous material used for the above-described sound absorbing panel generally has low strength and cannot be used as an interior material as it is in many cases. In such cases, thicken the porous material and attach it directly to the substrate,
Thus, a sound absorbing effect is exerted. However, when the porous material is thickened, the weight of the sound absorbing panel increases, which is inconvenient to handle, and the sound absorbing panel itself becomes expensive. Further, for example, when curtain fabric is used as a sound absorbing material, the strength required as an interior material cannot be obtained, so that it was not considered to apply this to a wall material or the like.

Accordingly, the inventors of the present invention have invented a sound absorbing panel using a honeycomb structure as a base material, and have filed an application (see Japanese Patent Application No. 10-321504). This Japanese Patent Application Hei 10-31
Although the sound-absorbing panel according to No. 2504 is not yet publicly known, the following problem remains. That is, since the cut surface of the sound absorbing panel is not smooth, it is impossible to perform a cutting process (sagging process). Therefore, when it is constructed as an interior finishing material, a joining auxiliary member such as a joiner is required. In this case, since the joining auxiliary member is exposed to the indoor side,
The sense of unity as the interior is hindered.

On the other hand, the conventional sound insulation panel has a low sound absorption coefficient, and therefore, in a room where room sound needs to be considered, the sound absorption power is often insufficient. Therefore, conventionally, a sound absorbing panel made of, for example, a porous material is placed on the sound insulating panel with an adhesive or a nail,
Attachment is performed using fastening materials such as screws. However, sound-absorbing materials made of porous materials such as glass wool and rock wool generally have low strength, and are likely to be damaged during transportation, transportation, construction, etc. I could not imagine.

Accordingly, an object of the present invention is to provide a structure having an appropriate structural strength as an interior material of a building, exhibit a sound absorbing effect in a wide range of sound, obtain a sense of unity as an interior, and reduce costs by simple construction. It is an object of the present invention to provide a lightweight and inexpensive sound absorbing panel capable of reducing noise.

Another object of the present invention is to provide a sound having a structural strength capable of being used as an interior material of a building and having both a sound insulating property required for a partition wall and a sound absorbing property capable of exhibiting a sound absorbing effect in a wide sound range. To provide a panel.

[0012]

In order to achieve the above object, a sound absorbing panel according to a first aspect of the present invention has a plate-like structure formed by a plurality of cells and a back surface of the structure. The bonded plate-shaped back member, the long member bonded to both the cut surface of the structure and the back member, and the air permeability bonded to both the surface of the structure and the long member And a plate-shaped surface member.

Here, the sound absorption phenomenon is that the sound energy is reduced when the sound wave passes through the medium or hits the surface of the medium. In other words, the sound wave is converted into heat energy by the viscosity of air or the vibration of the medium. It is caused by things. The medium here includes the structure, the back member, the long member, the front member, and the air surrounding these in the sound absorbing panel according to the first embodiment of the present invention.

In this sound absorbing panel, a honeycomb structure can be used as the structure. In addition, as this structure, a structure having an arbitrary cell shape other than the honeycomb structure can be used. According to this sound absorbing panel, since the surface member is adhered to the structure, for example, the honeycomb structure, a sound absorbing panel having mechanical strength such as compressive strength and bending strength suitable as an interior material for building can be obtained. Further, the structure, the back member and the front member can be made of thin paper having a thickness of about 5 mm or less. Thereby, the sound absorbing panel can be made lightweight and inexpensive.

As the surface member, a porous material having air permeability such as a nonwoven fabric can be used. Alternatively, a porous material can be formed by providing pores in a member having no air permeability, for example, paper. In this case, the pore diameter of the pores can be 0.1 to 5 mm, preferably 0.1 to 2 mm, and more preferably 0.1 to 1 mm. Further, the number of pores can be in the range of 3 to 60 / cm ² . According to this configuration, it is possible to provide a sound absorbing panel having an arbitrary sound absorbing coefficient by changing the air permeability of the surface member.

Further, a fitting portion can be formed on a surface of the long member opposite to a surface adhered to a cut surface of the structure. In this case, the fitting portion can be formed of a known seed (real) such as a real fruit, a notch, and a toy. Accordingly, since there is no need to use the interior auxiliary member, the interior auxiliary member is not exposed to the outside, and a sense of unity can be obtained in the interior. Further, since the construction is simplified, the construction cost can be reduced.

According to another aspect of the present invention, there is provided an acoustic panel including a plate-like first structure formed by a plurality of cells and a plurality of cells. A plate-like second structure, a plate-like back member adhered to the back surface of the first structure, and a plate-like member adhered to the front surface of the first structure and the back surface of the second structure. An intermediate member; and a plate-shaped surface member having air permeability adhered to the surface of the second structure.

Here, the sound insulation phenomenon occurs when a sound wave passes through a medium and the transmitted sound decreases due to a decrease in sound energy on the surface or inside of the medium. In general, the amount of the medium increases. The better the sound insulation performance, the better.
The reason why the sound absorption phenomenon occurs is as described above.
The medium here includes the first structure, the second structure, the back member, the intermediate member, the front member, and the air surrounding these in the acoustic panel according to the second embodiment of the present invention.

In this acoustic panel, a honeycomb structure can be used as the first structure and the second structure.
In addition, as the first structure and the second structure, a structure having an arbitrary cell shape other than the honeycomb structure can be used. The first structure and the second structure may be made of paper or plastic having a thickness of about 12 mm. Thus, the weight of the acoustic panel can be reduced.

The portion composed of the back member, the first structure and the intermediate member functions as a sound insulation layer. As the back member and the intermediate member, a material having no air permeability such as a medium / hard fiber board, a plywood, and a gypsum board can be used. In addition, the thickness of each of the first structure and the second structure may be in a range of 12 to 90 mm. Further, as the surface member, a member having air permeability in advance can be used. Alternatively, a porous material can be formed by providing pores in a member having no air permeability, for example, paper. In this case, the pore size of the pores is 0.1 to
It can be 5 mm, preferably 0.1 to 2 mm, more preferably 0.1 to 1 mm. The number of pores is 3
個 60 / cm ² .

According to this acoustic panel, for example, the back surface member and the intermediate member are respectively disposed on the back surface and the front surface of the first structure composed of the honeycomb structure, thereby forming the sound insulation layer. The second structure is arranged at
A surface member having air permeability is arranged on the surface of the second structure to form a sound absorbing layer, and the sound insulating layer and the sound absorbing layer are integrated.

As a result, the structure has a structural strength capable of being self-supporting as an interior material of a building. In addition, the sound absorbing layer can exhibit a sound absorbing effect in a wide sound range, and the sound insulating layer has the necessary sound insulating properties as a partition wall. Regarding sound insulation, sound energy is lost not only in the sound insulation layer but also in the sound absorption layer, so that sound transmission loss (hereinafter simply referred to as “transmission loss”) is larger than in the case of a single sound insulation layer, improving sound insulation performance. I do.

Further, for example, the thickness, cell size, mass of the back surface member and the intermediate member (sound insulation material) of the first structure and the second structure formed of the honeycomb structure, and the permeability of the surface member are changed. Accordingly, it is possible to provide an acoustic panel having any desired sound insulation and sound absorption.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) As shown in an exploded perspective view of FIG. 1 and a side view of FIG. 2, a sound absorbing panel according to a first embodiment of the present invention has a paper honeycomb core 10, a back liner paper 20, It is composed of a member 30 and a long member 40.

The paper honeycomb core 10 corresponds to the structure of the present invention. The paper honeycomb core 10 is formed by regularly arranging hexagonal cylindrical cells into a plate shape. Note that the structure of the present invention is not limited to a hexagon, and a cell having an arbitrary shape such as a circle or a polygon can be used. Further, the material of the structure is not limited to paper, and plastic and other lightweight members can be used. The height (thickness) of the paper honeycomb core 10 affects the sound absorption coefficient (for details, see Experimental Example 5 described later).

The back liner paper 20 corresponds to the back member of the present invention. The back liner paper 20 is a portion to be attached to a base material such as a wall or a ceiling. The back member of the present invention is not limited to liner paper, but may be a plate member such as plastic or a sheet member. The back liner paper 20 may be provided with pores in the same manner as in the case of the surface member 30 made of liner paper described later.

The surface member 30 comprises a nonwoven fabric 31 and a woven cloth 32 adhered to the nonwoven fabric 31. As the nonwoven fabric 31, for example, a glass nonwoven fabric having air permeability can be used. Further, the woven cloth 32 can be made of wallpaper without backing paper. The surface member 30
Can be used as a liner paper. In this case, the liner paper is provided with pores in order to ensure air permeability. The size and number of pores provided in this liner paper affect the sound absorption coefficient (for details, see Japanese Patent Application No.
12504).

The long member 40 can be made of a material having a strength capable of being machined, for example, wood or plastic. As the plastic, for example, foamed styrene, foamed hard urethane, foamed polyethylene, or the like can be used. As will be described later, on the side surface of the long member 40, a spring (real) as a fitting portion of the present invention is formed.

Next, a method of manufacturing the above sound absorbing panel will be described with reference to FIG.
This will be described with reference to FIG. First, after applying a vinyl acetate-based adhesive to the back surface of the paper honeycomb core 10, the back liner paper 20 is bonded. At this time, the paper honeycomb core 10 is cut so as to secure a margin 60 corresponding to the width of the long member 40 at both ends in the short direction of the back body liner paper 20.

Next, a margin 6 for the back liner paper 20 is provided.
After applying a vinyl acetate-based adhesive to both the cut surface of the paper honeycomb core 10 and the cut surface of the paper honeycomb core 10, the long member 40 is bonded. Thereby, a sound absorbing structure is formed. Next, the width and length of the sound absorbing structure are determined by machining. Thereafter, the end surface (the side surface of the long member 40) of the sound absorbing structure is cut to form a seed (real). As the shape of the seed (real), a well-known shape such as a real fruit, a notch, and a toy can be used.

Finally, after a vinyl acetate adhesive is applied to the surface of the paper honeycomb core 10 and the surface of the long member 40, the surface member 30 formed by bonding the woven cloth 32 to the nonwoven fabric 31 is bonded. The sound absorbing panel is completed. In the case where liner paper is used as the surface member 30, the operation of forming pores in the liner paper may be performed before the liner paper is bonded to the surface of the paper honeycomb core 10 and the surface of the long member 40. It may be performed after bonding.

According to the sound absorbing panel configured as described above, the mechanical strength such as the compressive strength and the bending strength is increased, and the joining auxiliary member for joining the sound absorbing panels to each other becomes unnecessary. There is no exposure to the indoor side. Therefore, a sense of unity as the interior is obtained, and the interior is suitable as an interior material for a building. The surface member 30
An air layer is formed behind the paper honeycomb core 10 by the paper honeycomb core 10, and a large sound absorbing effect is exhibited by the viscosity of the air layer.

(Embodiment 2) The acoustic panel according to the second embodiment of the present invention has a sound insulation layer 1 as shown in the side view of FIG.
And a sound absorbing layer 2. In the following, the same or corresponding parts as those of the sound absorbing panel according to Embodiment 1 described above are denoted by the same reference numerals. Further, in this acoustic panel, a description will be given assuming that there is no member corresponding to the long member in the first embodiment, but it is a matter of course that a long member similar to that in the first embodiment may be provided.

The sound insulation layer 1 of this acoustic panel is composed of a paper honeycomb core 11, a hard board 20, and a hard board 21. Paper honeycomb core 1
1 corresponds to the first structure of the present invention. The paper honeycomb core 11 has the same structure as that of the first embodiment, and a relatively thin one having a thickness (height) of about 12.7 mm can be used (see Experimental Example 2 described later).

The hard board (hard fiber board) 21 corresponds to the back surface member of the present invention. The hard board 21 is a portion to be attached to a base material such as a wall or a ceiling. Instead of the hard board 21, a plate member having no air permeability such as a medium fiber board, a plywood, a gypsum board, and a plastic board can be used.

The hard board 20 corresponds to the intermediate member of the present invention. As the hard board 20, the same one as the hard board 21 described above can be used. The sound absorbing layer 2 is formed on the hard board 21.

On the other hand, the sound absorbing layer 2 is provided in the first embodiment.
Is configured substantially in the same manner as the sound absorbing panel according to the above. That is, the sound absorbing layer 2 includes the paper honeycomb core 10, the hard board 20, and the surface member 30.

The paper honeycomb core 10 is the second embodiment of the present invention.
Corresponds to the structure. As the paper honeycomb core 10, the same one as in the first embodiment can be used. The hard board 20 is also used as that of the sound insulation layer 1.

The surface member 30 comprises a nonwoven fabric 31 and a nonwoven fabric 33
Are hot-melt bonded by a thermoplastic resin 34. As the nonwoven fabric 31, for example, a glass nonwoven fabric having air permeability is used. Note that liner paper can also be used as the surface member 30. In this case, the liner paper is provided with pores in order to ensure air permeability.

Next, a method for manufacturing the acoustic panel will be described. First, after a vinyl acetate-based adhesive is applied to the front and back surfaces of the paper honeycomb core 11, a hard board 21 is bonded to the back surface and a hard board 20 is bonded to the front surface. Next, after a vinyl acetate-based adhesive is applied to the back surface of the paper honeycomb core 10, the adhesive is bonded to the hard board 20.

Next, after a vinyl acetate-based adhesive is applied to the surface of the paper honeycomb core 10, the surface member 30
Are bonded to complete the acoustic panel. In the case where liner paper is used as the surface member 30, the operation of providing pores in the liner paper may be performed before or after the liner paper is bonded to the surface of the paper honeycomb core 10. Is also good.

According to the acoustic panel configured as described above, the mechanical strength such as the compressive strength and the bending strength of the sound absorbing layer 2 is increased, so that the acoustic panel in which the functions of the sound insulating panel and the sound absorbing panel are integrated is manufactured. Can be manufactured.
This acoustic panel has a surface member 3 on its sound absorbing layer 2.
Since the air layer is formed behind the paper honeycomb core 10 by the paper honeycomb core 10, a large sound absorbing effect is exhibited by the viscosity of the air layer. Further, since the sound insulation layer 1 is composed of the paper honeycomb core 10 having the hard boards 20 and 21 adhered to both surfaces, the sound insulation layer 1 has excellent sound insulation characteristics, as will be described later in detail.

Hereinafter, results of some experiments actually performed to examine the sound insulation characteristics (transmission loss characteristics) and the sound absorption characteristics of the acoustic panel configured as described above will be described.

(Experimental Example 1) In Experimental Example 1, only the sound insulation layer 1 of the acoustic panel was taken out (hereinafter sometimes referred to as "sound insulation panel 1" for convenience) and the same as the sound insulation panel 1. In order to compare the sound insulation characteristics of a flash panel having a thickness of 1 mm, transmission losses of the sound insulation panel 1 and the flash panel were measured at various frequencies. Here, the flash panel refers to a sound insulation panel in which a plate-like sound insulation material is adhered to both sides of a frame material, which will be described in detail later.

The structure of the sound insulating panel 1 used as the sample 1 is shown in FIG. This sound insulation panel 1 has a thickness of 1
A 5.5 mm thick hard board 2 is provided on both sides of a paper honeycomb core 11 having a size of 2.7 mm and a cell size of 3/8 inch.
0 and 21 are bonded with an adhesive made of vinyl acetate resin.

The structure of the flash panel used as the sample 2 is shown in FIG. In this flash panel, wood 12 having a thickness of 12.7 mm and a width of 35 mm is used as a core material. This wood 12 has a thickness of 5.5
The two cores are arranged at the peripheral portion on the hard board 21 mm and at the center as the center, and are adhered to the hard board 21 with an adhesive made of vinyl acetate resin. Further, a hard board 20 having a thickness of 5.5 mm is adhered to the upper side of the wood 12 with the adhesive.

FIG. 7 shows the results of measuring the transmission loss of Samples 1 and 2 in the range of 100 Hz to 4 KHz. Referring to the measurement results, when the thickness of the frame material of the flash panel is as thin as about 12 mm, the transmission loss is in the low / middle sound range (about 125 Hz to 1 KHz) due to resonance transmission.
It can be seen that the transmission loss of the sound insulation panel 1 is smaller than that of the sound insulation panel 1 and the sound insulation performance is inferior.

(Experimental Example 2) In Experimental Example 2, paper was used to clarify the relationship between the thickness (height) of the paper honeycomb core 11 used in the sound insulation panel 1 of the acoustic panel and the transmission loss. The transmission loss at various thicknesses and cell sizes was measured at various frequencies by changing the thickness and cell size of the honeycomb core 11.

The structure of the sound insulation panel 1 of the acoustic panel used as the sample 3 is shown in FIG. This sound insulation panel 1 has an adhesive made of vinyl acetate resin instead of 5.5 mm thick hard boards 20 and 21 on both sides of a paper honeycomb core 11 having a thickness of 12.7 mm and a cell size of 3/8 inch. It is configured to be adhered.

The structure of the sound insulation panel 1 of the acoustic panel used as the sample 4 is shown in FIG. This sound insulation panel 1 has a thickness of 25.4 as a paper honeycomb core 11.
The same as the sound insulation panel 1 used as the sample 3 except that a paper honeycomb core having a cell size of 、 inch and a cell size of イ ン チ inch was used.

The structure of the sound insulation panel 1 of the acoustic panel used as the sample 5 is shown in FIG. The sound insulation panel 1 has a thickness of 45 mm as the paper honeycomb core 11.
It is the same as the sound insulation panel 1 used as the sample 3 except that a paper honeycomb core of 0 mm and a cell size of 3/4 inch is used.

FIG. 11 shows the results of measuring the transmission loss of Samples 3 to 5 in the range of 100 Hz to 4 KHz. Referring to the measurement results, even if the thickness of the paper honeycomb core 11 is thin, the sound insulation performance is hardly reduced due to the resonance transmission in the low / middle sound range, and relatively good sound insulation performance is shown. In addition, it can be seen that the transmission loss increases as the thickness of the paper honeycomb core 11 decreases in a certain frequency range. According to this experiment, the transmission loss in the mid-range (500 Hz) was as follows: the thickness of the paper honeycomb core 11 was 12.7 mm.
It was confirmed that the smaller the thickness was, the better the sound insulation properties were in the range of 12.7 to 45.0 mm.

(Experimental Example 3) In Experimental Example 3, transmission loss was measured at various frequencies for an acoustic panel according to the present invention, that is, an acoustic panel in which the sound insulating layer 1 and the sound absorbing layer 2 were integrated.

The sample 1 used in Experiment 3 is the same as that used in Experiment 1. The structure of the acoustic panel used as the sample 6 is shown in FIG. The structure of the sound insulating layer 1 of this acoustic panel is the same as that used in Experimental Example 1. The sound-absorbing layer 2 has a thickness of 25.4 mm and a cell size of 1 /
The back surface of the 2-inch diameter paper honeycomb core 10 is bonded using an adhesive made of vinyl acetate resin, and the nonwoven fabric of 100 g / m ² and the 1-mm-thick nonwoven fabric impairs air permeability on the upper surface of the paper honeycomb core 10. The components are laminated in advance so as to be hot-melt bonded and bonded using an adhesive made of vinyl acetate resin.

FIG. 12 shows the results of measuring the transmission loss of Samples 1 and 6 in the range of 100 Hz to 4 KHz. Referring to the measurement results, it can be seen that the acoustic panel according to the second embodiment has better sound insulation performance particularly in the middle and treble range than the transmission loss of the sound insulation layer 1 alone. This is sound absorbing layer 2
This is the result of sound pressure energy being lost due to the sound absorbing power of the above, and the sound absorbing layer contributing to the sound insulation performance of the acoustic panel.

(Experimental Example 4) In Experimental Example 4, the acoustic panel according to Embodiment 2 was used as a ceiling panel, a wall panel and a floor panel of a unit room, and the sound pressure level was measured at various frequencies. It is.

FIG. 13 shows an example of the unit room used in the fourth experimental example. The ceiling panel of this unit room has a medium fiberboard 21 having a thickness of 5 mm from the outside and a thickness of 25 mm.
Paper honeycomb core 11 having a diameter of 5 mm and a cell size of 1/2 inch, a medium fiber board 20 having a thickness of 5 mm, and a thickness of 15 m
m, paper honeycomb core 10 of the cell size of 1/2 inch diameter, and the nonwoven fabric of the nonwoven fabric 100 g / m ² and a thickness of 1mm was constructed from the surface member 30, which is hot melt adhesive.

The wall panel is composed of a medium fiber board 21 having a thickness of 7 mm from the outside, a paper honeycomb core 11 having a thickness of 15 mm and a cell size of 1/2 inch, and a medium fiber board 2 having a thickness of 7 mm.
0, a paper honeycomb core 10 having a thickness of 25.4 mm and a cell size of 1/2 inch, a surface member 3 in which 100 g / m ² of nonwoven fabric and a nonwoven fabric of 1 mm thickness are hot melt bonded.
0.

The floor panel is composed of a medium fiber board 21 having a thickness of 7 mm from the outside, a paper honeycomb core 11 having a thickness of 15 mm and a cell size of 1/2 inch, and a medium fiber board 20 having a thickness of 7 mm. It was constructed by laying galaxy on the panel.

FIG. 14 shows the results of measuring the sound insulation performance of a unit room using the acoustic panel according to the second embodiment.
FIG. 15 shows the sound absorbing characteristics. FIG. 14 shows the JI
In accordance with “Measurement of sound pressure level difference between specific locations” in “Measurement method of sound pressure level difference at building site” specified in SA1417, 125 from a sound insulation measurement sound source installed in a unit room , 250, 500, 1k, 2k
And a 1-octave sound centered at six frequencies, such as 4 kHz, and an average sound pressure level in the unit room (an average value of five places within 5 dB variation) and a 1 m in front of the door outside the unit room. The average sound pressure level at the distance (average value at 5 points) was measured to determine these differences, and according to JISA1417-6 “Display of results and additional notes”, “Sound pressure level difference between specific locations (in unit room → door) Front)). In addition, FIG. 14 shows a reference curve (D− ×) for determining a sound insulation class related to a sound pressure level difference between specific locations in accordance with “Sound insulation class of a building” (JISA1419) for evaluating sound insulation performance.
×) is drawn.

According to the unit room using the acoustic panel according to the second embodiment, as shown in FIG. 14, it has good sound insulation characteristics of sound insulation class D-30, and FIG.
As shown in the figure, a unit room having good sound absorption characteristics of an average sound absorption coefficient of 35% (500 Hz) can be obtained, and a self-supporting structure having mechanical strength such as compressive strength and bending strength suitable as an interior material of a building. It was confirmed that it could be used as a material.

(Experimental Example 5) In Experimental Example 5, the relationship between the thickness (height) of the paper honeycomb core 11 used in the sound absorbing layer 2 of the acoustic panel according to the second embodiment and the sound absorbing coefficient was measured. For clarity, the thickness and cell size of the paper honeycomb core 10 were varied, and the sound absorption at each thickness and cell size was measured at various frequencies.

The sound absorbing layer 2 used in this experimental example 5 has a nonwoven fabric having air permeability as a surface member 30 on the surface of the paper honeycomb core 10 and a back liner paper 21 instead of a hard board on the back surface. It is configured to be adhered with an agent 50. In Experimental Example 5, the sound absorption coefficients of three types of samples having different thicknesses and cell sizes of the paper honeycomb core 10 were measured. The measurement of sound absorption coefficient is based on JI
The measurement was performed in accordance with “Reverberation room method for measuring sound absorption coefficient” defined in SA1409.

The structure of the sound absorbing layer 2 used as the sample 7 is
It is shown in FIG. 16 and its specifications are as follows. Paper honeycomb core: thickness 45 mm, cell size 3/4 inch Glass non-woven fabric: thickness 0.24 mm, weight 50 g / cm^Two  Weight of back liner paper: 337 g / m^Two 

The structure of the sound absorbing layer 2 used as the sample 8 was
It is shown in FIG. 17 and its specifications are as follows. Paper honeycomb core: thickness 25.4 mm, cell size 1/2 inch Glass non-woven fabric: thickness 0.24 mm, weight 50 g / cm^Two  Weight of back liner paper: 337 g / m^Two 

The structure of the sound absorbing panel used as Sample 9
Is shown in FIG. 18 and its specifications are as follows.
You. Paper honeycomb core: thickness 12.7 mm, cell size 3/8 Glass nonwoven fabric: thickness 0.24 mm, weight 50 g / cm^Two  Weight of back liner paper: 337 g / m^Two 

FIG. 19 shows the measurement results of Sample 7, Sample 8 and Sample 9, with the vertical axis representing the reverberation chamber method sound absorption coefficient and the horizontal axis representing the frequency. From FIG. 19, it can be seen that the sound absorption coefficient of the sound absorbing layer 2 changes by changing the thickness of the paper honeycomb core 10 and its cell size.

[0069]

As described above, according to the sound absorbing panel of the first aspect of the present invention, the sound absorbing panel has an appropriate structural strength as an interior material of a building, and can exhibit a sound absorbing effect in a wide sound range. In addition, it is possible to provide a lightweight and inexpensive sound-absorbing panel that can provide a sense of unity as the interior and reduce costs by simple construction.

Further, according to the acoustic panel of the second aspect of the present invention, the acoustic panel has a structural strength capable of being self-supporting as an interior material of a building, and can exhibit sound insulation required as a partition wall and a sound absorbing effect in a wide sound range. An acoustic panel having both sound absorbing properties can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a structure of a sound absorbing panel according to Embodiment 1 of the present invention.

FIG. 2 is a side view showing the structure of the sound absorbing panel according to Embodiment 1 of the present invention.

FIG. 3 is a diagram for explaining the method for manufacturing the sound absorbing panel according to Embodiment 1 of the present invention.

FIG. 4 is a side view showing a structure of an acoustic panel according to Embodiment 2 of the present invention.

FIG. 5 is a cross-sectional view showing a structure of a sample 1 used in Experimental Example 1 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 6 is a cross-sectional view showing a structure of a sample 2 used in Experimental Example 1 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 7 is a diagram showing transmission loss obtained in Experimental Example 1 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 8 is a cross-sectional view showing a structure of a sample 3 used in Experimental Example 2 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 9 is a cross-sectional view illustrating a structure of a sample 4 used in Experimental Example 2 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 10 is a sectional view showing a structure of a sample 5 used in Experimental Example 2 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 11 is a diagram showing transmission loss obtained in Experimental Example 2 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 12 is a diagram illustrating transmission loss obtained in Experimental Example 3 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 13 is a cross-sectional view showing a structure of a unit room used in Experimental Example 4 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 14 is a diagram showing a sound pressure level difference and a sound insulation grade obtained in Experimental Example 4 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 15 is a diagram showing the average sound absorption coefficient obtained in Experimental Example 4 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 16 is a cross-sectional view showing a structure of a sample 7 used in Experimental Example 5 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 17 is a cross-sectional view showing a structure of a sample 8 used in Experimental Example 5 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 18 is a cross-sectional view showing a structure of a sample 9 used in Experimental Example 5 of the acoustic panel according to Embodiment 2 of the present invention.

FIG. 19 is a diagram showing a sound absorption coefficient obtained in Experimental Example 5 of the acoustic panel according to Embodiment 2 of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Sound insulation layer (sound insulation panel) 2 Sound absorption layer 10, 11 Paper honeycomb core 12 Wood 20 Back liner paper, hard board (hard fiber board),
Medium fiber board, plywood 21 Hard board (hard fiber board), medium fiber board, plywood 30 Surface member 31, 33 Nonwoven fabric 32 Fabric cloth 34 Thermoplastic resin 40 Long member 50 Adhesive

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor, Tadashi Yasukawa 200 Terashimacho, Hamamatsu-shi, Shizuoka Prefecture F-term in Kawai Sound System Co., Ltd. (reference) 2E001 DF04 FA03 FA11 FA14 GA12 GA42 GA51 GA81 HA03 HA31 HC02 HC07 HC11 HD01 HD03 HD08 HD09 HD11 LA04

Claims (9)

[Claims] 1. A plate-like structure formed by a plurality of cells, a plate-like back member adhered to the back surface of the structure, and both a cut surface of the structure and the back member. A sound-absorbing panel comprising: an elongated member; and a permeable, plate-shaped surface member adhered to both the surface of the structure and the elongated member. 2. The sound absorbing panel according to claim 1, wherein said structure is a honeycomb structure. 3. The sound absorbing panel according to claim 1, wherein the structure, the back member and the front member are made of paper or plastic. 4. The sound-absorbing panel according to claim 3, wherein said surface member is provided with pores. 5. The sound-absorbing panel according to claim 1, wherein a fitting portion is formed on a surface of the long member facing a surface bonded to a cut surface of the structure. 6. A plate-shaped first structure formed by a plurality of cells, a plate-shaped second structure formed by a plurality of cells, and a plate bonded to a back surface of the first structure. A back member, a plate-like intermediate member adhered to the front surface of the first structure and the back surface of the second structure, and a gas-permeable plate surface adhered to the surface of the second structure A sound panel comprising: 7. The acoustic panel according to claim 6, wherein the first structure and the second structure are honeycomb structures. 8. The first structure, the second structure, a back member,
The acoustic panel according to claim 6, wherein the intermediate member and the surface member are made of paper or plastic. 9. The acoustic panel according to claim 8, wherein said surface member has pores.