JP2002328679A - Sound insulation material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improved sound insulation material which is increased in acoustic transmission loss and is more improved in sound insulation performance. SOLUTION: This sound insulation material is formed by providing the inner side of a surface material, such as a steel sheet, on the outermost side with a glass wool intermediate layer across an air layer and providing the innermost side thereof with a glass cloth lining stuck to the intermediate layer. The sound insulation material formed by omitting the glass cloth lining is equally well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a sound insulating material. More particularly, the present invention relates to an improvement in a sound insulating material suitable for shielding a cogeneration (cogeneration) system for sound insulation.

[0002]

2. Description of the Related Art Sound insulation materials for shielding noise generated from machinery are required to have water resistance, fire resistance and weather resistance as well as being effective in sound insulation and having sufficient strength. Conventionally, for example, in addition to a steel plate, a panel in which a lead sheet or the like is added to an X-ray shield or a heavy concrete block is known.

[0003] Cogeneration is a system that simultaneously supplies electricity and heat from one type of primary energy (eg, oil, gas, etc.) and uses energy effectively. In particular, a small and medium-sized system that uses electricity and heat simultaneously as a distributed energy system. Buildings in the form of packaged private generators of capacity,
It is becoming popular in hotels, inns, factories, etc. Although the power generation efficiency is as low as about 30 to 40%, the overall efficiency is increased to about 70 to 80% because the exhaust heat from the prime mover can be used for hot water supply and cooling / heating. Therefore, the future prospects of cogeneration are expected to spread to ordinary households. These systems include a lot of noise sources such as loud vibration noise, noise, unpleasant noise, muffled sound such as generator diesel engine, gas turbine, gas engine, fan, etc. Can be reduced as much as possible, but there is a limit to reducing the noise generated by the engine and the generator. Therefore, at present, a sound insulation material boundary wall is formed by covering the entire cogeneration system with a box-shaped steel plate. In other words, the boundary with the other space is separated by a sound insulating material boundary wall for silencing or insulating noise or an openable and closable boundary wall. As the most excellent sound insulation material at present, for example, two layers of glass wool are attached to the inside of the outer surface material made of steel plate and bonded, and the innermost side is lined with glass cloth, and has a solid structure (that is, no intermediate air layer) Sound insulation is used.

According to the mass rule, the current sound insulating materials are based on the fact that a material having a high surface density is effective for sound insulation. Therefore, as shown in this example, all of the materials have a solid structure and a reasonable sound insulating effect is achieved. Yes, but audible sound is JISA1416
However, satisfactory results have not yet been obtained in terms of the air sound insulation performance measured by the sound transmission loss value according to the present invention, and there is room for improvement. Based on empirical rules, the sound transmission loss value is 2.0 to 3.0 dB better than the current sound insulation material.
If a large sound insulation effect can be achieved, it can be said that it is a great improvement, and the numerical value is set as the target value of this kind of sound insulation material.

[0005]

In view of such a technical situation, the present inventors have conducted an improvement study on the structure of the current sound insulating material of the machine wall, and as a result, the present structure is contrary to common sense. It has been found that it is effective to provide an air layer, and furthermore, a specific arrangement is effective, and the present invention has been completed. Accordingly, an object of the present invention is to provide a sound insulating material having an improved sound insulating effect over an existing sound insulating material over an entire octave band region at a center frequency of 100 to 5000 Hz.

[0006]

According to a first aspect of the present invention, a glass wool layer is provided via an air layer directly inside an outer surface material as a sound source side. A sound insulating material including a hollow layer, which is provided in an inner layer.

According to a second aspect of the present invention, a glass wool intermediate layer is provided on the inner side of an outer surface material as a sound source side via an air layer, and is adhered to the glass wool intermediate layer on the innermost side. A sound insulating material including a hollow layer, characterized by having a cloth lining. That is, it differs from the sound insulating material of claim 1 in that a glass cloth lining is further provided on the innermost side.

According to a third aspect of the present invention, in the two sound insulating materials,
It is characterized by having sound insulation performance in which sound transmission loss is improved over the entire octave band region having a center frequency of 100 to 5000 Hz. Claims 4 and 6 relate to the sound insulation material, wherein the air layer is formed of a normal pressure air layer having a thickness of 5 to 100 mm, and the glass wool layer weighs 20 to 100 kg /.
having m ^3, it is mat made by hardening in alkali-containing glass wool and synthetic resin having a diameter of 0.5 to 20 [mu] m, an air layer and the glass wool layer has a respectively characterized by having the same thickness.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below more specifically with reference to the drawings. As shown in the schematic longitudinal sectional view of FIG. 1, the basic structure of the sound insulating material A of the present invention is such that a surface material 1 of the outermost layer, an air layer 2 adjacent to the surface material, and a glass wool intermediate provided through the air layer. It comprises a layer 3 and an innermost glass cloth lining 4 adhered to the glass wool layer. The sound insulating material A is provided in the form of a plate or a sheet, and is often used as a building material, for example, in the form of a panel fitted into an outer frame B, for example.

The outermost layer surface material 1 may be made of a metal plate such as chromium-containing or chromium-nickel-containing stainless steel, a synthetic resin plate, a wooden plate, or the like. From the viewpoint of water resistance, a metal plate such as steel or stainless steel, and a heat-resistant synthetic resin plate are preferable. Its thickness ranges from 1.0 to 10 mm, preferably from 1.5 to 5.0 mm. The air layer 2 adjacent to the surface material 1 may be at normal pressure or may be injected with either reduced pressure or pressurized air, and its thickness is in the range of 5 to 100 mm, preferably in the range of 10 to 75 mm. . Normally, the decompressed or pressurized air in the air layer is injected after assembling the intermediate layer 3. It is important that the location of this air layer be right next to the facing. It has been confirmed that the sound insulation effect is inferior to that of the conventional product if the surface material is formed in the opposite position configuration in which the air layer is provided via the glass wool layer.

[0011] The glass wool intermediate layer 3 is formed by placing glass in a tank.
Glass melted from the tank and flowed out of the tank through the nozzle
A cotton-like gas obtained by blowing air into the liquid
Lath staple fibers are collected and made into a mat, for example, phenol tree
Matte type solidified with synthetic resin such as fat or epoxy resin
It is composed of Various types of glass fiber
Can be used, preferably an alkali-containing glass fiber,
The fiber diameter is 1-20μm, average 4μm is suitable
I have. Glass wool mat is 1.0-100mm thick,
It is preferably 20 to 60 mm, and its weight is 20 mm.
~ 100kg / m ³, Especially 40 kg / m³Before and after
Is preferred. However, the air layer 2 and the glass window
The middle class 3 is a building such as a utility room as described above.
In terms of applications, it is preferable to have the same thickness
It is usually preferable that each is around 25 mm. this
The thickness should be selected appropriately according to the target noise source.
Can be.

The innermost glass cloth lining 4 is desirably provided when the required level of the sound insulation effect is high, but may be unnecessary when normal sound insulation is performed.
It can be omitted. The glass cloth lining 4 is integrally bonded to the glass wool intermediate layer 3 by being adhered to the glass wool intermediate layer 3 with an epoxy resin adhesive or the like, thereby producing a plate-shaped sound insulating material A. Such a glass cloth may be a surface cloth for glass wool, for example, a weight of about 200 g / m ² , a thickness of less than 0.2 mm, or a flame-resistant or fire-resistant cloth.
A high-performance coated cloth having sound insulation properties can be used. In any case, the glass cloth is preferably made of E glass cloth woven from a yarn having a single fiber diameter of 11 μm into plain weave, twill weave, satin weave, leno weave or the like.
In the latter case, for example, a silicone resin, chloroprene rubber, or the like is applied, the weight is about 290 to 370 g / m ² , and the thickness is 0.1 mm.
Those having a thickness of about 2 to 0.3 mm are preferable.

As still another embodiment, instead of directly adhering the glass cloth lining layer 4 to the glass wool layer 3 of the sound insulating material thus manufactured, the sound insulating material may be combined with the glass wool layer 3 in some cases. The innermost glass cloth lining 4 can also be provided after providing another air layer between the glass cloth lining 4 and the air layer.

As described above, the sound insulating material of the present invention is a combination of the sound insulating property of the surface material 1 such as a stainless steel plate and the air layer 2 and the glass wool layer 3 adjacent to the surface material and the innermost glass cloth lining 4. Due to the sound insulation and sound absorption by JIS A 14
16 can reduce the sound transmission loss by 3.0 dB or more.

Hereinafter, the present invention will be described in detail with reference to examples. Example 1 A 2.4 mm thick 18-8 stainless steel sheet surface material was placed outside in a rectangular outer frame having a vertical and horizontal size of slightly more than 2 m at the inner edge, and a single fiber diameter was separated by separating an air layer 25 mm. 40k, which is an average 4μm short glass fiber solidified with phenolic resin
g / m ³ glass wool mat (MAG manufactured by Mag Co., Ltd.)
After attaching the thing of 25mm thickness of BL4025),
Glass cloth (H-201M manufactured by Unitika Glass Fiber Co., Ltd.) having a thickness of 0.18 mm and a weight of 206 g / m ²
102) By sticking a liner having a thickness of 0.18 mm to a glass wool mat and fitting the whole into a frame, the height and width of the sound insulating material as shown in FIG.
m size panels were produced. Similarly, for comparison, two layers of the same glass wool are stacked instead of the air layer as shown in FIG. 2 (that is, a thickness of 50 mm).
Was affixed to a steel plate and lined with the same glass cloth to produce the same sound insulation material as existing ones.

The product of this embodiment and the conventional product (Comparative Example 1)
Sound transmission loss values were measured and compared using a sound insulation measuring device and method according to IS A 1416. This device is a device in which a sample is installed between two irregular reverberation rooms, a sound source side room and a sound receiving side room, and noise generated from the sound source side is amplified on the sound receiving side and recorded through an octave band filter. As for the frequency, a sound pressure level (dB) at a center frequency for each 1/3 octave band was measured. Table 1 shows the results.

[0017]

[Table 1]

As described above, the product of the present invention has a center frequency of 100
It can be seen that the sound transmission loss is higher in the entire region of the 1/3 octave band of Ｈｚ5000 Hz, and is higher than the average by about 4.8 dB, the lowest 2.6 dB to the highest 7.6 dB. That is, it was possible to achieve the target excellent sound insulation effect and noise reduction effect of 2 to 3 dB or more.

Example 2 The sound insulating material of Example 1 was manufactured in exactly the same configuration except that the glass cloth was omitted, and the sound transmission loss was measured. The results were compared with Comparative Example 1 to calculate the difference in loss, and the results are shown in Table 2.

[0020]

[Table 2]

In the case of the structure of the second embodiment having no glass cloth lining, the average transmission loss difference is about 4.0 dB, and although the effect is somewhat inferior to that of the first embodiment, the overall structure of the inside of the glass cloth is reduced. It can be seen that a sound insulation effect greater than that of the pasted product by 2 dB or more was obtained.

[0022]

As described above, the present invention provides a sound insulation material or a surface material composed of a glass wool intermediate layer and a glass cloth lining with an air layer interposed immediately inside a surface material such as an iron plate, an air layer, It is made of a sound insulating material with a structure consisting of the innermost layer of glass wool, and has a hollow structure instead of the solid structure of the conventional structure. In particular, it is thought that the combination of the surface material such as a steel plate and the hollow portion exerts a sound insulation effect, and the glass wool mat and the glass cloth lining exhibit the sound insulation and sound absorption effects. The effect is achieved. In addition, despite the fact that the number of constituent materials is smaller than that of conventional products (contrary to the mass rule related to the area density), unexpectedly excellent sound insulation performance is obtained and the cost is more advantageous. Has become. Furthermore, the sound insulation material of the present invention has sound insulation and strength, flame resistance, fire resistance, and water resistance, and is relatively lighter than conventional products. Suitable for possible walls, doors, etc. In particular, the sound insulating material of the present invention is also useful as a sound insulating panel for a partition wall that prevents noise transmission by separating a room in which the entire room is a noise source, for example, a utility room in which a cogeneration system is installed, from other spaces. It also has the effect of encouraging the spread of cogeneration because the negative factors are eliminated.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing an example of the sound insulating material of the present invention.

FIG. 2 is a schematic longitudinal sectional view of a conventional sound insulating material.

[Explanation of symbols]

 A sound insulation material 1 surface material 2 air layer 3 glass wool layer 4 glass cloth lining B rectangular outer frame

Claims (6)

[Claims] 1. A sound insulating material having a hollow layer for a cogeneration facility, wherein a glass wool layer is provided as an innermost layer via an air layer immediately inside an outer surface material as a sound source side. . 2. A glass wool intermediate layer is provided on the inner side of an outer surface material as a sound source side via an air layer, and is attached to the glass wool intermediate layer on the innermost side to provide a glass cloth lining. A sound insulating material comprising a hollow layer. 3. The sound insulation material according to claim 1, wherein the sound insulation material has improved sound transmission performance over a whole octave band region having a center frequency of 100 to 5000 Hz. 4. The sound insulating material according to claim 1, wherein the air layer comprises a normal pressure air layer having a thickness of 5 to 100 mm. 5. The glass wool innermost layer or intermediate layer has a weight of 20 to 100 kg / m ³ , 0.5 to 20 μm.
The sound insulating material according to any one of claims 1 to 4, wherein the mat is a mat obtained by solidifying alkali-containing glass short fibers having a diameter of a synthetic resin. 6. The sound insulating material according to claim 1, wherein the air layer and the glass wool layer have the same thickness.