JPH07213418A - Sound absorbing curtain and sound absorbing curtain structure - Google Patents

Abstract

PURPOSE:To provide a sound absorbing curtain, which has excellent sound absorbing property and can be installed, being hung down from a ceiling or the like, and is easy to utilize to an intricate place or a place in complicated shape, and the storage such winding, folding, etc., of which can be performed easily, and a sound absorbing curtain structure making use of this sound absorbing curtain. CONSTITUTION:These are a sound absorbing curtain 10, where a resin film sheet 12 and a flexible mesh-shaped sheet 14 are laid at least one sheet each on top of the other, preferably the resin film sheets 12 are piled up with a mesh-shaped sheet 14 between and each sheet face contacts fully with each other, and a sound absorbing curtain structure where this sound absorbing curtain 10 is arranged in air layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing curtain which has excellent sound absorbing properties and which can be placed (installed) by being hung from a ceiling or the like, and easily accommodated for winding, folding and the like. The present invention relates to a sound absorbing curtain structure using this sound absorbing curtain.

[0002]

2. Description of the Related Art Conventionally used sound absorbing materials are various kinds of porous materials such as glass wool, metal fibers, and metal sintered materials, which are panelized and used by being attached to a wall surface or the like. . Therefore, these conventional sound absorbing materials require a processing cost for making a panel in addition to the cost of the sound absorbing material itself, resulting in a very high cost.

The sound absorbing material is not limited to a flat space,
It is also necessary to install it in complicated parts such as in the factory or in ships where piping and wiring are complicated, curved parts and parts with complicated shapes. However, with the conventional panel-shaped sound absorbing material, it is difficult to mount it in a good condition at a position where such a sufficient space cannot be secured, the cost for mounting is high, and it is necessary to further process the sound absorbing material. There may be. Moreover, it is often impossible to obtain a predetermined sound absorption characteristic depending on the mounting condition.

Further, in a music room such as a piano room or a music listening room, a gymnasium, etc., it is preferable to attach a sound absorbing material also to a door, a window, etc. However, in the conventional panel-shaped sound absorbing material,
It is difficult to install or remove, and if the sound absorbing material is incorporated and fixed in the window or the like, the window becomes unusable.

Therefore, no processing such as paneling is required; it can be easily installed even in a complicated place or a place having a complicated shape, and can exhibit desired sound absorption characteristics; easy storage by folding or winding. It is easy and possible to use it for windows, etc .; and the advent of a curtain-shaped sound-absorbing material (sound-absorbing curtain), which can be expected to have such advantages, is desired. However, a sound absorbing curtain having good sound absorbing characteristics has not yet been realized.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. It has excellent sound absorption characteristics and can be installed by being hung from a ceiling or the like.
Easy to use in complicated places and complicated shapes,
Moreover, it is an object of the present invention to provide a sound absorbing curtain that can be easily stored such as wound up and folded, and a sound absorbing curtain structure using this sound absorbing curtain.

[0007]

In order to achieve the above object, the present inventor has conducted extensive studies and, as a result, has achieved the present invention by obtaining the following findings.

Conventionally, by vibrating a thin film such as a vinyl sheet, that is, by vibrating a smooth surface,
It is known to exert some sound absorbing action. Although it is possible to produce a sound absorbing curtain by utilizing this, the sound absorbing effect obtained by utilizing the vibration (membrane vibration) of this smooth surface is very low, and even the maximum sound absorbing coefficient is 0.3 to Since it is about 0.4, it has not been put to practical use as a sound absorbing curtain.

On the other hand, as a result of intensive studies by the present inventor, an excellent film vibration absorbing material is realized by sandwiching a resin thin film between plate-like members having a large number of openings such as expanded metal and punching metal. We found that we could do it, and proposed it by Japanese Patent Application No. 5-20227.

As shown in FIG. 8, this sound absorbing material has a structure in which the resin thin film 16 is sandwiched by plate-like members having a large number of openings such as punching metals 72 and 74.
When a sound wave G is incident on the film vibration absorbing material as shown in FIG. 8, a sound wave (vibrating air) hitting the surface of the resin thin film 16 is received.
Sound absorbing action (hereinafter referred to as sound absorbing action a) due to the vibration of the resin thin film 16 by the compression action of the resin thin film 16
The sound wave G incident on the resin thin film 16 flows along the surface of the resin thin film 16, and the sound absorbing action (hereinafter referred to as sound absorbing action b) due to the viscous action of the flow of the sound wave G is punched by the vibration of the resin thin film 16 described above. A sound absorbing action (hereinafter referred to as a sound absorbing action c) by hitting the metals 72 and 74 by absorbing vibration and sound energy is respectively expressed, and an excellent sound absorbing characteristic is exhibited by a mutual effect of each sound absorbing action.

Further, Japanese Patent Publication No. 5-29920 discloses that
As a sound-absorbing material that utilizes membrane vibration, a lattice-shaped wooden frame or the like is used to apply tension to the thin film and divide the film into small areas. A sound absorbing method is disclosed in which sound waves having different phases are emitted from each thin film to absorb sound by mutual appreciation of the sound waves.

That is, in the prior art, in order to realize a sound absorbing material having a sufficient sound absorbing property by utilizing the film vibration of a thin film which can be expected to be used for a sound absorbing curtain, punching metal, a grid-like frame body, etc. It was thought that the support of the thin film by the rigid body was essential. However, with these methods, the result is a panel-shaped sound absorbing material similar to the conventional one, and it is possible to realize a sound absorbing curtain having various advantages such as being able to be wound up and being easy to install. You cannot do it.

On the other hand, the present inventor has conducted extensive studies in order to realize a sound absorbing curtain having a sufficient sound absorbing characteristic, and as a result, the resin thin film sheet and the flexible mesh sheet (screen mesh) are superposed. It has been found that a sound absorbing action similar to the above-described sound absorbing action c is extremely strongly exhibited by preferably forming a mesh sheet between resin thin film sheets and bringing all sheet surfaces into contact with each other. That is, by having the above-mentioned configuration, the resin thin film sheet vibrates extremely finely when a sound wave is incident, and the resin thin film sheet and the mesh sheet collide with each other due to this vibration to absorb vibration and sound energy,
The inventors have found that it is possible to realize a sound absorbing curtain having a very excellent sound absorbing characteristic, and have completed the present invention.

That is, the sound absorbing curtain of the present invention provides a sound absorbing curtain characterized in that at least one resin thin film sheet and at least one flexible mesh sheet are superposed on each other and the respective sheet surfaces are entirely in contact with each other. To do.

Further, in the sound absorbing curtain, it is preferable that the resin thin film sheet is arranged with the mesh sheet interposed therebetween.

Furthermore, the sound absorbing curtain structure of the present invention comprises:
One piece of the sound absorbing curtain or a plurality of pieces with a gap provided,
Provided is a sound absorbing curtain structure characterized in that an air layer is provided on a wall surface.

In the sound absorbing curtain structure,
Between the sound absorbing curtains arranged with a gap, it is preferable to have a spacer that widens the gap.

The sound absorbing curtain of the present invention and the sound absorbing curtain structure using this sound absorbing curtain will be described in detail below.

1 and 2 are conceptual views showing an example of the sound absorbing curtain of the present invention. 1 is an exploded view of the sound absorbing curtain of the present invention as viewed from the surface direction (front) of the sheet, and FIG. 2 is a partially enlarged view of the sound absorbing curtain as viewed in a direction perpendicular to FIG. is there. In the sound absorbing curtain of the present invention, the resin thin film sheet 12 and the flexible net-like sheet (flexible screen mesh) 14 are overlapped with each other (see the sound absorbing curtain 20 in FIG. 3 (b)), preferably, FIGS. The resin thin film sheet 1 as in the sound absorbing curtain 10 shown in FIG.
The mesh sheet 14 is sandwiched between 2 and 12, and the sheet surfaces (the convex portions when the mesh sheet 14 has unevenness) are entirely in contact with each other.

As schematically shown in FIG. 3A, when a sound wave is incident on the resin thin film sheet 12 with the resin thin film sheet 12 arranged with an air layer provided on the wall surface 18,
Although the resin thin film sheet 12 vibrates by this sound wave to exert a sound absorbing action, as described above, this sound absorbing action is extremely small, and most of the sound wave is not absorbed and the resin thin film sheet 1 is not absorbed.
It penetrates through 2 and is reflected by the wall surface 18.

On the other hand, as shown schematically in FIG. 3 (b), the sound absorbing curtain 20 of the present invention in which the resin thin film sheet 12 and the mesh sheet 14 are superposed and the sheet surfaces are in full contact When an air layer is provided for 18 (an example of the sound absorbing curtain structure of the present invention), the resin thin film sheet 12 vibrates extremely finely due to the incidence of sound waves, and this vibration causes the resin thin film sheet 12 to gently contact. It collides with the reticulated sheet 14 and absorbs vibration and sound energy well, and as will be described in detail in later Examples, it exhibits excellent sound absorption characteristics.

Further, as in the sound absorbing curtain 10 shown in FIG. 1 and FIG. 2, when the mesh sheet 14 is sandwiched between the resin thin film sheets 12 and 12, the sound absorbing effect can be exhibited on both sides thereof. It becomes possible and can exhibit more excellent sound absorption characteristics.

The material of the resin thin film sheet 12 used in the sound absorbing curtain 10 (20) of the present invention is not particularly limited.
Any of various known resin thin films such as vinyl chloride thin film, polyethylene thin film, polypropylene thin film, ethylene fluoride thin film, polyvinylidene thin film, acrylic thin film, etc. can be applied, but sound absorption characteristics, weather resistance, From the viewpoint of durability and the like, a fluoroethylene thin film and a polyvinylidene thin film are particularly preferably applied.

As the ethylene fluoride resin used for the ethylene fluoride thin film, various known resins are exemplified, but tetrafluoroethylene (PTFE), tetrafluoroethylene-6.
Fluoropropylene copolymer, tetrafluoroethylene / polyethylene copolymer (ETFE), trifluoroethylene chloride (PCT
FE) and the like are preferably exemplified. These fluoroethylene-based resins are nonflammable and have excellent chemical resistance, weather resistance, and heat resistance.

As the polyvinylidene-based resin used as the polyvinylidene-based thin film, various known resins are exemplified, but vinylidene difluoride (PVDF), vinylidene cyanide and the like are preferably exemplified. These vinylidene resins are excellent in chemical resistance and weather resistance.

The thickness of the resin thin film sheet 12 is not particularly limited as long as it can be vibrated by a sound wave according to the physical properties of the resin material, but in order to exhibit good sound absorption characteristics, the resin thin film is required. The thickness of the sheet 12 is preferably 6 to 30 μm.
The thickness is about m, more preferably about 6 to 15 μm.

On the other hand, the material of the mesh sheet 14 used in the sound absorbing curtain of the present invention is not particularly limited, and one having sufficient flexibility, specifically, having a corrugation or the like when suspended. A mesh sheet made of various materials can be used as long as it has a good flat shape and is flexible enough to easily contact the entire surface of the resin thin film sheet. Specifically, a mesh screen formed of the material for forming the resin thin film sheet 12 described above, a mesh-like woven fabric woven with various fibers such as glass fiber, carbon fiber, and resin fiber are preferably exemplified. . Among them, a mesh-like woven fabric woven with long glass fibers is particularly preferable in terms of compatibility with the resin thin film sheet 12 and the above-mentioned flatness.

The thickness of the reticulated sheet 14 is not particularly limited as long as it is a flat surface when suspended, depending on the material and the form of the reticulated sheet 14.

Further, the aperture ratio of the mesh sheet 14 is not particularly limited, but in order to exhibit a good sound absorbing property, it is 5
It is preferably about 100 to about 100 mesh, preferably about 30 to 60 mesh.

Such a sound absorbing curtain 10 (2 of the present invention
0) can be produced by stacking the resin thin film sheet 12 and the mesh sheet 14 and fixing the upper ends of the sheets together (whole or partial). Further, in order to improve the contact property of each sheet, the same fixing may be performed at the lower end portion, and further at the side end portion, if necessary. The fixing method is not particularly limited, and various known sheet material fixing methods can be used.

If necessary, a weight or the like may be arranged at the sound absorbing curtain 10 or the lower end portion of the mesh sheet 14 in order to prevent waviness of the mesh sheet 14, and the weight and the sound absorbing curtain 10 described above. It may also serve as a fixing member (means) at the lower end. Further, if necessary, two or more resin thin film sheets 12 or net-like sheets 14 may be directly superposed, or a constitution in which two or more superposing units of the resin thin film sheet 12 and the net-like sheet 14 are provided. Good.

Basically, the sound absorbing curtain of the present invention having such a structure has the above-described excellent sound absorbing characteristics,
Because of its structure, it has good flexibility and can be easily used in a complicated place or a place having a complicated shape, and can be stored easily by winding or folding. Therefore, it is difficult to use the conventional panel-shaped sound absorbing material such as the complicated parts such as the pipes and wiring in the factory or the ship, the curved parts and the complicated shapes, and the windows of the piano room. It is also suitable for certain applications.

The sound absorbing curtain structure of the present invention comprises one or a plurality of the sound absorbing curtains 10 (20) of the present invention as described above and an air layer provided on the wall surface. The sound absorbing curtain structure of the present invention (see FIGS. 6 (b) and 6 (c)) in which one sound absorbing curtain of the present invention is arranged with an air layer provided is described with reference to FIG. 3 (b) described above. As described above, good sound absorption characteristics are exhibited.

Further, the sound absorbing curtain structure of the present invention (see FIGS. 6 (d) and 7 (e)) in which a plurality of sound absorbing curtains of the present invention are arranged with a gap and an air layer is arranged is shown in FIG.
As schematically shown in FIG. 2, the sound wave that has passed through the first sound absorbing curtain can be absorbed by the sound absorbing curtain that is arranged subsequently, and very good sound absorbing characteristics can be exhibited. In the illustrated example, two sound absorbing curtains of the present invention are arranged, but the present invention is not limited to this, and
You may arrange one or more sound absorbing curtains,
Further, the sound absorbing curtains of the present invention having different configurations (for example, the sound absorbing curtains 10 and 20) may be used together. Further, it is possible to use together with a conventional panel-shaped sound absorbing material, including a mode in which one sheet of the above-mentioned sound absorbing curtain of the present invention is used.

In such a sound-absorbing curtain structure of the present invention, the size of the air layer (the distance between the sound-absorbing curtain and the wall surface) when one sound-absorbing curtain is arranged is not particularly limited. It may be similar, but usually 40 to 200
It is about mm, preferably about 40 to 150 mm. Further, in the mode of using a plurality of sound absorbing curtains,
The sound absorbing curtains may be arranged such that the distance between the sound absorbing curtains (and the distance between the wall surface and the sound absorbing curtain closest to the wall surface) is about 20 to 60 mm, preferably about 40 to 60 mm. The intervals of the sound absorbing curtains may be the same or different.

In such a sound absorbing curtain structure of the present invention, the sound absorbing curtain 10 of the present invention is provided with an air layer on the wall surface, and is fixed directly to the ceiling or to a beam or the like for fixing the sound absorbing curtain. According to the method, the sound absorbing curtain of the present invention can be fixed and hung from above. The method of fixing the sound absorbing curtain to the ceiling or the like is not particularly limited, and any known method of fixing a sheet-like object can be used.

Further, in the sound absorbing curtain structure, the lower end of the sound absorbing curtain may be fixed if necessary, or the sound absorbing curtain can be stored by a known sheet storage method such as winding and folding. You may comprise. Further, in an embodiment having a plurality of sound absorbing curtains, a holding member (see FIG. 5) for keeping the lower end portions of the curtains at a predetermined interval may be provided, and this may also serve as the weight.

As mentioned above, the sound absorbing curtain of the present invention is
It is necessary that the resin thin film sheet and the mesh sheet are entirely in contact with each other. Therefore, in the sound absorbing curtain structure of the present invention using a plurality of sound absorbing curtains, as shown in FIG. 5, the sound absorbing curtains 22 and 22 of the present invention arranged at predetermined intervals (to simplify the drawing, It is preferable to dispose the spacers 26, 26 between the two (indicated by a single line) to widen the distance between the sound absorbing curtains, particularly in the middle portion. In FIG. 5, reference numeral 28 is a hanging string for suspending and holding the spacer, and reference numeral 30 is a holding member for holding the lower ends of both sound absorbing curtains at predetermined intervals. With such a configuration, it is possible to obtain a better sound absorbing characteristic by making the contact state of each sheet constituting each sound absorbing curtain favorable and reducing the vibration of the sound absorbing curtain due to the sound pressure.

The position of the spacer 26 is not particularly limited, and the number of spacers is not limited to two in the illustrated example, and one or three or more spacers may be arranged. Further, the spacer is not limited to the plate shape in the illustrated example, and may be a rod shape.

Although the sound absorbing curtain and the sound absorbing curtain structure of the present invention have been described above in detail, the present invention is not limited to this and various modifications and improvements can be made without departing from the scope of the present invention. Of course it's good.

[0041]

EXAMPLES The present invention will be described in more detail with reference to specific examples of the present invention. Example 1 A PTFE (Teflon) sheet having a thickness of 12 μm as the resin thin film sheet 12 (indicated by A in the following Table 1), and a mesh woven from glass fibers as the mesh sheet 14 (indicated by B in the following Table 1). Sound absorbing curtains of the present invention and conventional sound absorbing curtains were produced using a sheet-like woven fabric (plain weave, thickness 0.08 mm), and various samples of the present invention and conventional sound absorbing curtain structures were produced.

<Sample a> As shown conceptually in FIG. 6 (a), the air thin layer was set to 80 mm (arrow a), and the resin thin film sheet 12 was suspended from the ceiling to form a sound absorbing structure. <Sample b> As conceptually shown in FIG.
The air layer is set to 80 mm (arrow a) and the resin thin film sheet 1
The sound absorbing curtain 20 of the present invention in which 2 and the mesh sheet 14 are overlapped is hung from the ceiling to form the sound absorbing structure of the present invention. <Sample c> As conceptually shown in FIG.
The air layer is set to 80 mm (arrow a) and the resin thin film sheet 1
The sound-absorbing curtain 10 of the present invention, which was superposed by sandwiching the mesh sheet 14 in 2, was suspended from the ceiling to form the sound-absorbing structure of the present invention. <Sample d> As conceptually shown in FIG.
The sound absorbing structure of the present invention was configured by suspending from the ceiling two sound absorbing curtains 20 of the present invention in which the resin thin film sheet 12 and the mesh sheet 14 were overlapped with each other with an air layer of 40 mm (arrow b). <Sample e> As conceptually shown in FIG.
The sound absorbing structure of the present invention is configured by suspending from the ceiling two sound absorbing curtains 10 of the present invention in which the air layer is set to 40 mm (arrow b) and the mesh sheet 14 is sandwiched between the resin thin film sheets 12 and stacked. .

For each of the above sound absorbing structures, 500, 80
0, 1000K, 1600K, 2000K, 2500K
The sound absorption coefficient at each frequency [Hz] was measured. The results are shown in Table 1 below.

[0044]

[Table 1]

As shown in Table 1 above, in the sample a composed only of the resin thin film sheet 12 (A),
While the average sound absorption coefficient is slightly less than 30%, in the sample b using the sound absorbing curtain 20 (A / B) of the present invention in which the resin thin film sheet 12 and the mesh sheet 14 are superposed, as described above, The vibration absorption of the resin thin film sheet 12 and the vibration of the mesh sheet 14 and the absorption of sound energy achieves an average sound absorption coefficient of 34.1%. Furthermore, the sound absorbing curtain 10 (AB) of the present invention in which the mesh sheet 14 is sandwiched between the resin thin film sheets 12 and stacked.
In the sample c using A), since the sound absorbing effect is exhibited on both sides, the average sound absorbing coefficient of 65.6% is achieved.

Further, the sound absorbing curtain 20 of the sample b is set to 2
Sample (d) arranged (A + B + A / B) achieved an excellent average sound absorption coefficient of 73.6% by the action of the two sound absorbing curtains 20. Further, two sound absorbing curtains 20 of sample c are arranged (A / B / A + A / B /
A) In the sample e, the excellent average sound absorption rate of 81.3% is improved by the action of the two sound absorbing curtains 10.

In samples c and d, the same experiment was conducted with each air layer set to 30 mm, but almost the same results were obtained.

[Embodiment 2] The sound absorbing curtains 10 and 20 of the present invention were placed in a piano room in the same manner as an ordinary curtain. The air layer was 120 mm. As a result, a good sound absorbing effect was obtained and a good piano performance could be enjoyed. Further, the sound absorbing curtains 10 and 20 could be easily rolled up and stored, and did not hinder the use of windows or the like after the performance. From the above results, the effect of the present invention is clear.

[0049]

As described in detail above, according to the sound absorbing curtain of the present invention and the sound absorbing curtain structure using the same, the sound absorbing curtain has excellent sound absorbing characteristics and is installed by being suspended from the ceiling or the like. It is easy to use in complicated places and complicated shapes, and can be easily stored for winding, folding, etc., so piping and wiring inside factories and ships are complicated. Parts, curved parts and parts with complicated shapes, and even windows in the piano room,
The sound absorbing material in the form of a conventional panel can be suitably used for applications where it is difficult to use.

[Brief description of drawings]

FIG. 1 is a schematic exploded view of an example of a sound absorbing curtain of the present invention.

FIG. 2 is a schematic view of the sound absorbing curtain shown in FIG. 1 when viewed from another direction.

FIG. 3 (a) shows the sound absorbing effect of the resin thin film sheet, and FIG.
[Fig. 3] is a conceptual diagram for explaining the sound absorbing action of the sound absorbing curtain structure of the present invention.

FIG. 4 is a conceptual diagram illustrating a sound absorbing action of the sound absorbing curtain structure of the present invention.

FIG. 5 is a view conceptually showing another aspect of the sound absorbing curtain structure of the present invention.

6 (a), (b), (c) and (d) are diagrams conceptually showing a configuration example of an embodiment.

FIG. 7 is a diagram conceptually illustrating a configuration example of an example.

FIG. 8 is a diagram conceptually showing a sound absorbing action of a conventional membrane vibration sound absorbing material.

[Explanation of symbols]

 10, 20, 22 Sound absorbing curtain 12 Resin thin film sheet 14 Mesh sheet 16 Resin thin film 18 Wall surface 26 Spacer 28 Hanging string 30 Fixing member 72, 74 Punching metal

Claims (4)

[Claims] 1. A sound-absorbing curtain, characterized in that at least one resin thin film sheet and at least one flexible mesh sheet are superposed on each other, and the respective sheet surfaces are entirely in contact with each other. 2. The sound absorbing curtain according to claim 1, wherein the resin thin film sheet is arranged with the mesh sheet interposed therebetween. 3. A sound absorbing curtain structure comprising one or a plurality of the sound absorbing curtains according to claim 1 and / or claim 2 and an air layer provided on a wall surface. . 4. The sound-absorbing curtain structure according to claim 3, further comprising a spacer that widens the space between the sound-absorbing curtains arranged with a space.