JP2009097306A - Movable indoor sound-absorbing/insulating body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop a movable indoor sound-absorbing/insulating body which has flame-retardancy, has sound-absorbing performance and sound-insulating performance together, and can easily control an indoor acoustical condition by balancing the sound-absorbing performance and the sound-insulating performance. <P>SOLUTION: In the movable indoor sound-absorbing/insulating body, a fiber hard board made of a fiber raw material comprising a fire-retardant acrylic fiber, a PET fiber, and a PET binder fiber, having an areal weight of 1.0-2.0 kg/m<SP>2</SP>, an air flow resistance of 2,000-3,500 Nsm<SP>-3</SP>, and a thickness of 3-10 mm is installed to form an air space between it and a window, and the fiber hard board is movable, so that its angle can be optionally changed. The movable indoor sound-absorbing/insulating body contains 4-30 wt.% of the fire-retardant acrylic fiber. An optional number of fiber hard boards are arranged horizontally or vertically, and can optionally change their angles at the same time by a movable mechanism. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a movable indoor sound absorbing and insulating body capable of enhancing the sound absorbing and insulating effect in a room depending on the situation.

  In a conference room, a lecture hall, a classroom or the like where a person's voice is required to be easily heard, if the internal sound is reflected too much, it is difficult to use as an acoustic space.

  On the other hand, in the case of a concert hall or the like, an appropriate sound reflection, that is, “resonance” is often required.

  Furthermore, sound insulation from the outside may be given priority over the sound absorption of the internal space depending on the situation.

Therefore, there is a need for a sound absorbing and insulating body that can adjust the sound absorbing effect of the internal space according to the situation and can also exhibit the sound insulating performance as necessary.
JP-A-10-82259 JP 2006-106447 A

However, after the conventional sound absorbing material for internal space is attached by construction, as is clear from the sound absorbing ceiling plate attached to the ceiling, for example, the sound absorbing performance corresponding to the frequency is almost fixed. Therefore, it is impossible to change the sound absorption performance according to the situation. The acoustic reflector installed in the concert hall is also installed at a necessary position as a result of calculating the acoustic effect, and therefore, it is usually not removed or reattached.
Accordingly, an object of the present invention is to develop a movable sound-absorbing / insulating body that can arbitrarily adjust the sound-absorbing performance of the internal space as necessary, and can also exhibit a sound-insulating effect.
At the same time, in order to be used in public buildings and high-rise buildings, it is necessary that the sound absorbing and insulating body satisfies the flameproof standard. In general, in order to satisfy the flameproof standards, it is only necessary to construct a sound absorbing and insulating material using flame retardant and incombustible materials. However, when these materials are used, there is no particular influence on the sound insulating properties. Although it does not occur, it often reduces sound absorption, and it has been difficult to achieve both flame retardancy and non-flammability and sound absorption.

  In order to solve this problem, the present inventors have developed a movable indoor sound absorbing and insulating body as a result of intensive studies, and the gist of the present invention is as follows.

Made of fiber material, made of flame retardant acrylic fiber, PET fiber, PET binder fiber, surface weight 1.0-2.0kg / m ² , air flow resistance value 2000-3500N · s · m ^-3 , thickness A movable indoor sound absorbing and insulating body characterized in that a hard fiber board having a thickness of 3 to 10 mm is installed so as to have an air layer between the window and the fiber hard board can be moved to change the angle arbitrarily.
The movable indoor sound absorbing and insulating body described above, comprising 4 to 30 wt% of flame retardant acrylic fiber.
The movable indoor sound absorbing and insulating body described above, characterized in that the fiber hard plate is composed of an arbitrary number of sheets, is arranged horizontally or vertically, and can be simultaneously changed to an arbitrary angle by a movable mechanism.

The fiber raw material used for this invention is comprised from a flame-retardant acrylic fiber, PET type fiber, and a PET-type binder fiber, It is characterized by the above-mentioned.
Flame retardant fibers include acrylic fiber, flame retardant acrylic fiber copolymerized with flame retardant monomer on polyester fiber, flame retardant polyester fiber, regenerated cellulose fiber by kneading or reacting with flame retardant chemicals, and the polymer itself. Flame retardant thermosetting resin fibers, aramid fibers, cotton processed with flame retardant chemicals, wool, and the like are known. Of these, flame retardant acrylic fiber is particularly used in the present invention. Vinyl chloride, vinylidene chloride, vinyl bromide, and vinylidene bromide are used as flame retardant monomers to be copolymerized with acrylic fibers, and antimony trioxide is used when advanced flame retardancy is required. A method of adding a metal oxide such as antimony pentoxide as a flame retardant to an acrylic fiber polymer has been taken.
PET fiber is a thermoplastic resin fiber made from polyethylene terephthalate resin, and it is recyclable and has a low specific gravity. Therefore, instead of glass fiber that has been used in conventional sound absorbing materials, it is used as a raw material fiber for sound absorbing materials. Applications are expanding. And since there is a problem that the PET fiber itself is flammable, a flame retardant PET fiber in which the PET fiber is made flame retardant has been developed. In the present invention, the flame retardant PET fiber is not used, and a normal PET fiber is used. use. Further, for molding, the melting point is higher than that of the above-mentioned PET fiber, and PET binder fiber is contained as a binder fiber for molding.

It is essential that the flame-retardant acrylic fiber used in the present invention is blended in the range of 4 to 30 wt% of the entire raw material.
If the blending amount is less than 4 wt%, the flame-retardant performance required for the molded sound-absorbing sound insulation board may be insufficient. If blending exceeds 30 wt%, the flame disappears but the carbonized area of the fiber increases. There is a risk of it.

  The above fiber raw material is finely defibrated by passing it through a defibrator called a feeder in which a drum having a hook-shaped needle on its surface rotates at a high speed to obtain a very low density cotton-like material. This is called a fleece.

A PET-based binder fiber is sprayed, mixed or mixed in the fleece, and heated to produce a semi-cured = semi-cured thermoplastic felt raw fabric.
Alternatively, a needle felt original fabric can be formed by performing a needling process.
At this time, it is possible to obtain a fiber hard plate having a surface weight in the range of 1.0 to 2.0 kg / m ² by adjusting the amount of the fiber raw material used. If the surface weight is less than 1.0 kg / m ² , the plate is insufficiently rigid and easily deforms. If the surface weight exceeds 2.0 kg / m ² , the weight increases more than necessary, which is not practical.

A hard fiberboard can be formed by pre-heating, cold roll compression molding, or heat-pressure molding using an appropriate mold. In this step, the air flow resistance value can be adjusted. The value of the airflow resistance after molding it is necessary to 2000~3500N · s · m ^-3, when an air flow resistance value of less than 2000N · s · m ^-3 is human audible range frequency band The sound absorption effect in the high frequency band may be insufficient, and if the air flow resistance value exceeds 3500 N · s · m ⁻³ , the sound absorption effect is extremely reduced, not limited to the frequency band. There is a risk that.
Furthermore, it is necessary to adjust the hard fiberboard to a thickness of 3 to 10 mm. If the thickness is less than 3 mm, the sound insulation effect may be significantly lower than that of the hard fiber board. If the thickness exceeds 10 mm, the sound absorption and insulation effect is not improved in proportion to the thickness, and the manufacturing cost increases. Therefore, it is disadvantageous in the case of commercialization.

Said hard fiber board is shape | molded by the processing methods, such as a cutting | punching and stamping, into a rectangle of a suitable size, a strip shape, etc. according to the place installed indoors.
One or more holes are made at both ends of each hard fiber board, and the threads are connected to each other through the thread, and at the same time, the angle of all the boards is changed at the same time by operating the thread. Is provided. The mechanism may be obtained by diverting a well-known technique of a blind generally attached to a window for the purpose of shielding light or blocking external line of sight. When the adjustment angle is 0 degree, each of the hard fiberboards is all horizontal and covers the window as a whole, and has the maximum sound absorption and insulation effect.

The sound in the room is first absorbed when passing through the hard fiberboard, and the remaining sound waves that have not been absorbed reach the air layer behind, where they are attenuated and reflected by the window glass, and again by the air layer. While being attenuated, the sound is again incident on the hard fiberboard from the window side and is absorbed.
When the angle of each plate is 0 degree, that is, when the plates are arranged horizontally, it is desirable that there is almost no gap between the plates, or the portions where the ends of the plates overlap slightly It may be in a state of having. However, if there is a gap in each plate, the sound insulation performance of the sound absorbing and insulating body according to the present invention may be reduced.

  When the sound absorbing and insulating body according to the present invention is installed in an arbitrary window portion in a room, it is installed when the angle of each hard fiber board is 0 degree, that is, when each board is horizontally aligned. It is necessary to adjust so that the distance between the window glass and the hard fiber plate is 5 mm to 150 mm, and to install an air layer between the window glass and the sound absorbing and insulating body. When the distance is less than 5 mm, it is not sufficient as a back air layer for attenuating the sound wave transmitted through the hard fiber plate, and the sound wave reflected by the window glass is incident on the hard fiber plate from the window glass side, and further on the indoor side The sound absorption effect may be reduced. Even if the distance exceeding 150 mm is set, the sound absorbing effect of sound attenuation by the back air layer is not different from that at 150 mm, but the sound absorbing and insulating body protrudes from the window to the indoor side, resulting in narrowing the indoor space.

A sheet having a sound absorbing effect or felt is laminated and attached to one side of the hard fiberboard, and the sound absorbing sheet or felt is placed on the window side. The air flow resistance value of the sound-absorbing sheet or the hard fiber board on which the felt is laminated is also required to be 2000 to 3500 N · s · m ^−3, and the sound-absorbing sheet or felt is necessarily required to have air permeability. The
By adopting this configuration, once the sound in the room passes through the hard fiber board, the sound wave is further attenuated by the sound absorbing sheet or felt, and the sound wave transmitted through the sound absorbing sheet or felt is attenuated by the back air layer. Since the sound is further absorbed by being reflected by the window glass and entering the sound absorbing sheet or felt laminated on the window glass side, the sound wave that escapes from the hard fiberboard to the indoor side has negligible acoustic energy.

  By changing the sound absorbing and insulating body according to the present invention from 0 degrees to 90 degrees using the angle adjusting mechanism described above, the sound absorbing and insulating body can be directly opposed to the sound from any direction in the room, Adjustment is possible to obtain an optimal sound absorption effect. As for the sound absorption effect in the room, it is not always best to obtain the maximum sound absorption effect according to the usage conditions in the room, and there are cases where it is desired to reduce the sound absorption effect to obtain a reflected sound. However, by adjusting the angle, it is possible to reduce the sound absorption effect and increase the reflected sound.

  The purpose of the sound absorbing and insulating body according to the present invention is to absorb indoor sound and sound outside the room, but it can be used for interior decoration by dyeing the fiber material used or coloring the finished hard fiberboard. It is also possible to add a general blind function for adjusting the amount of incident light from the outside.

  In order to provide an understanding of the present invention, examples are described below. Needless to say, the present invention is not limited to the following examples.

A fleece is made with 46 wt% of PET recycled fiber and 4 wt% of flame retardant acrylic fiber, and 50 wt% of PET binder fiber is mixed with this to make an original fabric. Was used to obtain a hard fiber plate having a surface weight of 1.0 kg / m ² and an air flow resistance value of 2000 N · s · m ⁻³ . The fiber hard plate was cut into a strip shape having a width of 100 mm and a height of 1000 mm. Two holes are opened in the upper part of each strip fiber hard plate, and each hole is connected to two horizontal bars installed parallel to the upper part by a thread. The horizontal bar sticks out the string via the angle adjusting mechanism, and by pulling the string, each strip fiber hard plate can move at the same angle at the same time.
The distance from the window glass when the strip fiber hard plate was installed horizontally at an angle of 0 degrees was 100 mm.

A fleece is made of 20 wt% of PET recycled fiber and 30 wt% of flame retardant acrylic fiber, and 50 wt% of PET binder fiber is mixed with this to make an original fabric. Was used to obtain a hard fiber plate having a surface weight of 1.0 kg / m ² and an air flow resistance of 3500 N · s · m ⁻³ . The fiber hard plate was cut into a strip shape having a width of 100 mm and a height of 1000 mm. Two holes are opened in the upper part of each strip fiber hard plate, and each hole is connected to two horizontal bars installed parallel to the upper part by a thread. The horizontal bar sticks out the string via the angle adjusting mechanism, and by pulling the string, each strip fiber hard plate can move at the same angle at the same time.
The distance from the window glass when the strip fiber hard plate was installed horizontally at an angle of 0 degrees was 100 mm.

A fleece is made with 46 wt% of PET recycled fiber and 4 wt% of flame retardant acrylic fiber, and 50 wt% of PET binder fiber is mixed with this to make an original fabric. Was used to obtain a hard fiber plate having a surface weight of 2.0 kg / m ² and an air flow resistance of 2000 N · s · m ⁻³ . The fiber hard plate was cut into a strip shape having a width of 100 mm and a height of 1000 mm. Two holes are opened in the upper part of each strip fiber hard plate, and each hole is connected to two horizontal bars installed parallel to the upper part by a thread. The horizontal bar sticks out the string via the angle adjusting mechanism, and by pulling the string, each strip fiber hard plate can move at the same angle at the same time.
The distance from the window glass when the strip fiber hard plate was installed horizontally at an angle of 0 degrees was 100 mm.

A fleece is made with 46 wt% of PET recycled fiber and 4 wt% of flame retardant acrylic fiber, and 50 wt% of PET binder fiber is mixed with this to make an original fabric. Was used to obtain a hard fiber plate having a surface weight of 2.0 kg / m ² and an air flow resistance of 3500 N · s · m ⁻³ . The fiber hard plate was cut into a strip shape having a width of 100 mm and a height of 1000 mm. Two holes are opened in the upper part of each strip fiber hard plate, and each hole is connected to two horizontal bars installed parallel to the upper part by a thread. The horizontal bar sticks out the string via the angle adjusting mechanism, and by pulling the string, each strip fiber hard plate can move at the same angle at the same time.
The distance from the window glass when the strip fiber hard plate was installed horizontally at an angle of 0 degrees was 100 mm.

[Comparative Example 1]
A fleece is made with 47 wt% of PET recycled fiber and 3 wt% of flame retardant acrylic fiber, and 50 wt% of PET binder fiber is mixed with this to make an original fabric. Was used to obtain a hard fiber plate having a surface weight of 0.8 kg / m ² and an air flow resistance of 1800 N · s · m ⁻³ . The fiber hard plate was cut into a strip shape having a width of 100 mm and a height of 1000 mm. Two holes are opened in the upper part of each strip fiber hard plate, and each hole is connected to two horizontal bars installed parallel to the upper part by a thread. The horizontal bar sticks out the string via the angle adjusting mechanism, and by pulling the string, each strip fiber hard plate can move at the same angle at the same time.
The distance from the window glass when the strip fiber hard plate was installed horizontally at an angle of 0 degrees was 100 mm.

[Comparative Example 2]
A fleece is made with 19wt% of PET recycled fiber and 31wt% of flame retardant acrylic fiber, and 50wt% of PET binder fiber is mixed with this to make an original fabric. Was used to obtain a hard fiber plate having a surface weight of 0.8 kg / m ² and an air flow resistance of 3700 N · s · m ⁻³ . The fiber hard plate was cut into a strip shape having a width of 100 mm and a height of 1000 mm. Two holes are opened in the upper part of each strip fiber hard plate, and each hole is connected to two horizontal bars installed parallel to the upper part by a thread. The horizontal bar sticks out the string via the angle adjusting mechanism, and by pulling the string, each strip fiber hard plate can move at the same angle at the same time.
The distance from the window glass when the strip fiber hard plate was installed horizontally at an angle of 0 degrees was 100 mm.

[Test Method 1]
Using a small reverberation chamber method sound absorption coefficient evaluation apparatus, the sound absorption coefficient of the movable sound absorbers of Examples 1 and Comparative Example 2 was measured.

[Test Method 2]
Using a simple sound insulation evaluation apparatus (reverberation room / semi-anechoic room) using sound intensity, the sound insulation effect of the movable sound absorbers of Example 1 and Comparative Example 2 was measured.

[Test Method 3]
In accordance with the test method “45 ° micro <Meckel> burner method” of the article name “curtains etc.-thin cloth <thick cloth>” in “Guidelines for flameproof performance test standards for flameproof articles” established by the Japan Flame Protection Association, The test bodies according to Example 1 and Comparative Example 2 were burned, and the afterflame time, the residual time, and the carbonized area were measured.
[result]
Table 1 shows the results of measuring the sound absorption rate according to Test Method 1.
Examples 1 to 4 showed a good sound absorption rate in each frequency band, but in Comparative Examples 1 and 2, the sound absorption rate was not particularly high in the high frequency band.
Table 2 shows the sound insulation effect measurement results by Test Method 2.
Table 3 shows the combustion results of Test Method 3.
Although Examples 1-4 showed the favorable sound-insulation effect in each frequency band, Comparative Example 1 showed the performance close to Examples 1-4 only in the sound-insulation effect, but Comparative Example 2 was Examples 1-4. It was bad compared with. In Examples 1 to 4, the afterflame time, the residual time, and the carbonized area were all within the evaluation criteria, but Comparative Example 1 was the afterflame time, and Comparative Example 2 was the carbonized area. The result was out of the range.

The movable sound absorbing and insulating body according to the present invention can be easily adjusted according to the acoustic conditions required in the room, so that the sound absorbing priority type (sound absorbing body angle 0 degree) is changed to a sound absorption priority type (sound absorbing body is an arbitrary sound absorbing body). It is possible to change to an angle open state. This is effective not only for adjusting the sound absorption of the sound generated in the room, but also for isolating external noise.
Further, by using a light-impermeable material as the material of the sound absorbing plate, it can be used as a commercially available blind and a blind that is in no way inferior in light shielding performance.
Furthermore, the movable sound absorbing and insulating body according to the present invention has a flameproof performance determined by a public institution, and can be used in highly public buildings.

It is a figure when the movable sound absorber according to the present invention is installed 100 mm in front of the window and the angle of the movable sound absorber is 0 degree. FIG. 3 is a view when the movable sound absorber according to the present invention is installed 100 mm in front of a window and each sound absorbing plate of the movable sound absorber is developed to form an angle of 40 degrees.

Claims (3)

Made of fiber material, made of flame retardant acrylic fiber, PET fiber, PET binder fiber, surface weight 1.0-2.0kg / m ² , air flow resistance value 2000-3500N · s · m ^-3 , thickness A movable indoor sound absorbing and insulating body characterized in that a hard fiber board having a thickness of 3 to 10 mm is installed so as to have an air layer between the window and the fiber hard board can be moved to change the angle arbitrarily. The movable indoor sound absorbing and insulating body according to claim 1, comprising 4 to 30 wt% of a flame retardant acrylic fiber. The movable indoor sound absorbing and insulating body according to claim 1 or 2, characterized in that the fiber hard plate is composed of an arbitrary number of sheets, is arranged horizontally or vertically, and can be simultaneously changed to an arbitrary angle by a movable mechanism. .