KR102420868B1 - Flexible sound absorbent barrier - Google Patents

Abstract

The present invention provides a flexible sound absorbing barrier which has mechanical strength and waterproof property for minimizing the impact of external environments and, at the same time, is made of a flexible material for ensuring high mobility and flexibility, so as to improve utility for various noise resources. The flexible sound absorbing barrier of the present invention includes a sound absorbing layer and a waterproof fabric layer arranged in the direction of a noise resource against the noise resource on one surface of the sound absorbing layer.

Description

Flexible sound absorbent barrier

The present invention relates to a flexible sound-absorbing wall, and more particularly, it has mechanical strength and waterproofness that can minimize the influence of the external environment, and at the same time, it is made of a flexible material to ensure ease of movement and flexibility. It relates to a flexible sound-absorbing wall that can improve the utility of noise sources.

A typical noise barrier includes a solid material wall made of a material such as metal, plywood, or acrylic glass to prevent transmission of noise. However, since these walls tend to reflect sound waves rather than absorb them, the overall noise level reduction effect is negligible; rather, the noise level within the fence formed by the walls is sometimes increased due to the presence of the walls.

Accordingly, in order to solve the problem of the conventional noise barrier wall, a noise blocking technology through sound absorption was introduced by including a sound absorbing material including a sound absorbing material such as female sand or glass fiber inside the noise barrier wall. However, this technology is also very limited in its application for various purposes such as construction sites or industrial facilities requiring actual noise barriers due to the following problems.

First, the conventional sound-absorbing wall (noise barrier wall) including a sound-absorbing material containing a sound-absorbing material inside has a problem with its use, although it is effective for sound absorption, depending on the environment in which the sound-absorbing wall is utilized. For example, since the sound-absorbing material does not include a protective layer, it is torn due to external impact or is easily exposed to a moisture environment, so that the sound-absorbing efficiency is rapidly reduced and there is a problem that the noise cannot be reliably blocked, and also in an external environment such as a construction site Due to problems such as increased weight due to rain, water leakage during storage, and decay or mold growth, there was a difficulty in using it only in a limited space or in a limited situation.

Second, in order to minimize the problem caused by the above-mentioned surrounding environment, the sound absorbing material is accommodated between two or more solid material layers that are not permeable to solids, or in the form of a quadruple structure (1 cover-waterproof sound-permeable fiber membrane-sound-absorbing material-2 cover type) A sound-absorbing wall made of However, in the case of having such a protective cover, the weight and volume are excessively large, so there is a serious difficulty in moving and storing, there is a problem in that it cannot be installed closely according to various noise sources. However, there were cases in which the fiber membrane was damaged even when it was broken.

Moreover, the sound-absorbing wall including the sound-absorbing material is mostly non-flexible or is made of non-bendable material, so the sound-absorbing performance may be excellent, but it cannot be installed in close contact with the surrounding structure, as well as the surrounding environment and use Since it cannot be installed according to the requirements, it was difficult to apply it to various industrial and living spaces that require noise isolation.

On the other hand, flexible sound-absorbing walls have limitations in the selection of materials to maintain flexibility, so while maintaining flexibility, the number of layers to reduce volume and weight is minimized, and at the same time, mechanical properties, waterproofness, and high-frequency range are maintained. There is a problem that it is extremely difficult to satisfy all the sound absorption coefficients.

Accordingly, it has mechanical strength and waterproofness that can minimize the influence of the external environment while having a sound absorbing material for efficient noise blocking, and at the same time, it is manufactured from a flexible material to ensure ease of movement and flexibility, so that it is more effective than a noise source. There is an urgent need to study a flexible sound-absorbing wall that can be placed close together and has excellent sound absorption in the high-frequency region.

Korean Patent Application No. 10-2006-0110789 (2006.11.10)

The present invention has been devised to overcome the above-mentioned problems, and the problem to be solved by the present invention is to have sufficient mechanical strength and waterproofness in spite of having a sound-absorbing material to enable efficient sound absorption, so that the influence by the external environment can be minimized, , and at the same time, it is made of a flexible material to provide a flexible sound-absorbing wall that can improve the ease of movement and flexibility and the sound absorption rate in the high-frequency range, so that it can be used in various industries and living spaces.

The present invention includes a sound-absorbing layer and a waterproof fabric layer disposed in the direction of a noise source for sound absorption on one surface of the sound-absorbing layer in order to solve the above-described problems, and a flexible sound-absorbing layer that satisfies all of the following relational expressions (1) to (4) provide a wall

(1) The waterproof fabric layer has a tensile strength in the weft direction and a tensile strength in the warp direction of 3500N or more

(2) the waterproof fabric layer has an average porosity of 60 to 90%

(3) The waterproof fabric layer has a water repellency rating of 4 or higher evaluated according to KS K ISO 4920

(4) The flexible sound-absorbing wall is a flexible sound-absorbing wall, characterized in that the sound absorption coefficient measured according to KS F 2805:2014 is 0.6 or more in the frequency range of 2000 to 4000 Hz.

In addition, according to another embodiment of the present invention, the waterproof fabric layer may be characterized in that a fluorine-based compound is coated.

In addition, according to an embodiment of the present invention, the waterproof fabric layer may have a basis weight of 1000 g/m ² or less, and the fineness of the yarn constituting the waterproof fabric layer may be 1500 to 2500 denier.

In addition, according to another embodiment of the present invention, the waterproof fabric layer may be characterized in that it does not include a separate cover.

In addition, according to another embodiment of the present invention, the waterproof fabric layer may be characterized in that the woven polyester fiber.

In addition, according to an embodiment of the present invention, it may further include a protective layer on the other surface of the sound-absorbing layer.

In addition, according to another embodiment of the present invention, it may be characterized in that it further comprises a sound insulating layer interposed between the protective layer and the sound-absorbing layer to reflect the noise passing through the sound-absorbing layer back to the sound-absorbing layer.

Also, according to another embodiment of the present invention, the sound insulating layer may have a sound transmission-loss class (STC) value of 20 or more.

In addition, according to another embodiment of the present invention, the flexible sound-absorbing wall includes a plurality of eyelets for mounting consisting of a pair of two holes on the edge, and the edge is dissociated with a fabric for waterproofing. can be characterized as

The present invention can minimize the influence of the external environment as it has sufficient mechanical strength and waterproofness despite having a sound-absorbing material to enable efficient sound absorption, It can reliably block noise.

At the same time, in the present invention, as the sound-absorbing wall is made of a flexible material to have flexibility, the ease of movement and flexibility are remarkably improved, so that it can be used for various noise sources, and it can be placed closer to the noise source, thereby greatly improving the sound insulation efficiency. , and furthermore, it has an excellent sound absorption rate even at high frequencies, so it is possible to significantly improve the utility as an industrial material.

1 is a cross-sectional view showing a flexible sound-absorbing wall according to an embodiment of the present invention.
2 is a cross-sectional view showing a flexible sound-absorbing wall according to another embodiment of the present invention.
3 is a plan view showing the flexible sound-absorbing wall of the present invention.
4 is a graph showing the sound absorption rate of Example 1 according to the present invention.
5 is a graph showing the sound absorption rate of Comparative Example 1.

Hereinafter, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

As described above, the conventional sound-absorbing wall was greatly affected by the external environment, so there was a limitation in the use or place of use, and the weight and volume of the sound-absorbing wall were large and inflexible, so it was difficult to move and store, and the mechanical strength was weak, so there was a small external It can be easily damaged even by impact, so it has been a cause of greatly lowering the usability in various industries and living spaces.

Accordingly, the present invention includes a sound-absorbing layer and a waterproof fabric layer disposed in the direction of a noise source for sound absorption on one surface of the sound-absorbing layer, and the waterproof fabric layer satisfies all of the following relational expressions (1) to (4). Provides a sound-absorbing wall.

(1) The waterproof fabric layer has a tensile strength in the weft direction and a tensile strength in the warp direction of 3500N or more

(2) the waterproof fabric layer has an average porosity of 60 to 90%

(3) The waterproof fabric layer has a water repellency rating of 4 or higher evaluated according to KS K ISO 4920

(4) The flexible sound-absorbing wall is a flexible sound-absorbing wall, characterized in that the sound absorption coefficient measured according to KS F 2805:2014 is 0.6 or more in the frequency range of 2000 to 4000 Hz.

Through this, it has sufficient mechanical strength and waterproofness to minimize the influence of the external environment. have.

Hereinafter, the flexible sound-absorbing wall 100 according to the present invention will be described.

As shown in Figure 1, the present invention includes a sound-absorbing layer (10).

The sound-absorbing layer 10 serves to absorb the sound generated by the noise source (Sound absorption) to soundproof. More specifically, the vibration energy of the sound generated from the noise source is absorbed by the sound absorbing layer 10 and again converted into thermal energy through friction in the sound absorbing layer 10 to realize sound insulation.

To this end, the sound-absorbing layer 10 may be manufactured using a known material exhibiting excellent sound-absorbing performance, and preferably, a known conventional fiber having a noise reduction coefficient (NRC) value of 0.75 or more may be used. , More preferably, it can be manufactured using a thermocompression-bonded polyester fiber having a noise reduction ratio of 0.80 or more. That is, the sound-absorbing layer 10 may be constituted by fusion bonding such thermocompression-bonded polyester fibers to form a nonwoven multi-layer structure.

At this time, when the sound-absorbing layer 10 is composed of polyester fibers according to a preferred embodiment of the present invention, the density may be 20 to 60 kg/m ² , and more preferably 30 to 50 kg/m ² . If the density of the sound-absorbing layer 10 is less than 20 kg/m ² If the density is too low, there may be a problem that the sound-absorbing efficiency is reduced, and if the density of the sound-absorbing layer 10 exceeds 60 kg/m2 If the density is too high, there may be a problem in that the weight increases.

In addition, the sound-absorbing layer 10 may have a mechanical strength of at least a certain level to prevent external impact or damage during movement, for example, fibers having tensile strength of 500 N/cm ² or more in the longitudinal and width directions, respectively. can be used, and more preferably, the tensile strength in the longitudinal direction is 650 N/cm ² or more, and the tensile strength in the width direction is 500 N/cm ² or more Thermocompression-bonded polyester fibers can be used. At this time, when the sound-absorbing layer 10 is implemented by thermocompression-bonded polyester fibers, the thermal strain may be 0.1% to 0.2% in the longitudinal direction and 0.05% to 0.09% in the width direction.

On the other hand, the size and thickness of the sound-absorbing layer 10 is not particularly limited as it can be appropriately selected in consideration of the environment such as the type and location of the noise source, but as a non-limiting example, the waterproof fabric layer 20 and the protective layer ( 30) may have a size smaller than that of the waterproof fabric layer 20 and the protective layer 30 to be sufficiently protected, and may have a thickness of 25 mm to 50 mm.

Next, the present invention includes a waterproof fabric layer 20 for sound absorption disposed in the direction of the noise source for sound absorption on one surface of the sound absorption layer 10 .

In general, the effect of reducing the overall noise level is negligible because noise barriers intended to block noise tend to reflect sound waves rather than absorb them; rather, the noise level within the fence formed by the wall is increased due to the presence of the wall. there was also

In order to improve this problem, a sound-absorbing wall including a sound-absorbing material that reduces reflection and implements sound insulation through sound absorption has been introduced. Otherwise, there was a difficulty in using it in various uses or places.

Furthermore, in order to realize sound insulation through sound absorption and at the same time supplement its mechanical properties and waterproofness, research on sound-absorbing walls having a quadruple structure (1 cover-waterproof sound-permeable fiber membrane-sound-absorbing material-2 cover type) is being attempted, but this also Due to the quadruple structure, the weight and volume are greatly increased, and most of them are made of non-flexible or non-bending materials, so they cannot be installed in close contact with the surrounding structure, It was difficult to apply to various industrial and living spaces requiring noise isolation because it could not be installed according to the requirements.

In addition, since the flexible sound-absorbing wall has a limit in the selection of materials for maintaining flexibility, it minimizes the number of layers to reduce volume and weight while maintaining flexibility, and at the same time, mechanical properties, waterproofness, and high-frequency range. There is a problem that it is extremely difficult to satisfy all the sound absorption coefficients.

Therefore, the present invention can pass through most of the sound generated from the noise source without reflecting the sound generated from the noise source by implementing the waterproof fabric layer 20 as a waterproof or water-repellent treated porous fiber with excellent mechanical strength, and the sound-absorbing layer 10 from moisture penetration. can protect

More specifically, the waterproof fabric layer 20 has a waterproof or water repellent property that does not reflect noise and does not easily penetrate moisture in order to minimize the increase in noise level due to reflection of sound and solve the problem of being vulnerable to moisture penetration. By using the fiber shown in the figure and weaving it back into a flexible porous structure with excellent mechanical strength, it is possible to minimize the influence of the external environment while improving the usability for various noise sources.

To this end, the waterproof fabric layer 20 according to the present invention satisfies all of the following relational expressions (1) to (3).

(1) The waterproof fabric layer has a tensile strength in the weft direction and a tensile strength in the warp direction of 3500N or more

(2) the waterproof fabric layer has an average porosity of 60 to 90%

(3) The waterproof fabric layer has a water repellency rating of 4 or higher evaluated according to KS K ISO 4920

(4) The flexible sound-absorbing wall is a flexible sound-absorbing wall, characterized in that the sound absorption coefficient measured according to KS F 2805:2014 is 0.6 or more in the frequency range of 2000 to 4000 Hz.

Hereinafter, the above relational expressions (1) and (2) will be described.

Since a general sound-absorbing wall does not include a protective layer, it is torn due to external impact or is easily exposed to a moisture environment, so that the sound absorption efficiency is rapidly reduced and there is a problem that the noise cannot be reliably blocked. In addition, in order to prevent this, a sound-absorbing wall that accommodates the absorption layer between the solid material layers or is manufactured in the form of a quadruple structure (1 cover-waterproof sound-permeable fiber membrane-sound-absorbing material-2 cover type) has been introduced. Since the weight and volume are too large, there is a serious difficulty in moving and storage, and there is a problem in that it cannot be installed closely according to various noise sources.

To this end, the waterproof fabric layer 20 according to the present invention is implemented with a known conventional fabric having excellent mechanical performance satisfying both the above relational expressions (1) and (2), and in particular, the flexible sound-absorbing wall 100 according to the present invention. ), it is implemented as a fabric, not a conventional polyurethane foam or inflexible fiber, which has no bendability, and is preferably woven with synthetic fibers such as nylon, recycled PET fiber, and polyester fiber. More preferably, it may be woven with polyester fibers.

On the other hand, the relation (1) means that the waterproof fabric layer 20 according to the present invention has sufficient mechanical strength to effectively protect the sound-absorbing layer 10 due to an external impact, and more specifically, The waterproof fabric layer 20 according to the present invention is implemented with fibers having both tensile strength in the weft direction and tensile strength in the warp direction of 3500N or more, and preferably it may be woven with polyester fibers having a tensile strength of 5000N or more in the warp direction. At this time, if any one of the tensile strength in the weft direction or the tensile strength in the warp direction is 3500N or less, it is vulnerable to external impact and mechanical damage of the waterproof fabric layer 20 occurs even in a small impact, resulting in significantly lowered waterproof performance or the original structure. There may be problems that cannot be achieved.

In addition, the waterproof fabric layer 20 according to the present invention may be implemented as a fabric having an average porosity of 60 to 90% according to the above relation (2), and more preferably a polyester fiber having an average porosity of 70 to 80%. can be woven At this time, if the average porosity of the waterproof fabric layer 20 is less than 60%, there may be a problem in that the space through which moisture penetrates increases, and the waterproof performance is lowered or the strength of the fabric is lowered. In addition, if the average porosity of the waterproof fabric layer 20 exceeds 90%, there is a fear that the noise transmittance of the waterproof fabric layer 20 is significantly reduced.

At this time, when the waterproof fabric layer 20 is woven with polyester fiber according to a preferred embodiment of the present invention, the basis weight is 1000 g/m ² or less, and the fineness of the yarn constituting the waterproof fabric layer is 1500 to 2500 denier. It may be formed of fabric. More preferably, the waterproof fabric layer 20 may be formed of a fabric having a basis weight of 100 to 900 g/m2 and a yarn fineness of 1800 to 2200 denier. At this time, if the basis weight of the waterproof fabric layer 20 is less than 100 g/m2, there is a risk that the mechanical strength of the waterproof fabric layer 20 is reduced, and if the basis weight of the waterproof fabric layer 20 is 1000 g/m2 If it exceeds, there may be a problem in that sufficient flexibility cannot be imparted to the flexible sound-absorbing wall 100 including the waterproof fabric layer 20 .

Next, the above relation (3) will be described.

In the present invention, a fluorine-based compound may be coated on the waterproof fabric layer 20 in order to impart waterproof and water-repellent performance of the flexible sound-absorbing wall 100 . That is, in the prior art, an additional cover or waterproof membrane was required to impart water-repellent or waterproof performance to the sound-absorbing wall, but this unnecessarily increases the thickness, volume and weight of the sound-absorbing wall, rather restricting its use for various purposes. However, in the present invention, as the fluorine-based compound is coated on the waterproof fabric layer 20, the water repellency rate evaluated by KS K ISO 4920 is grade 4 or higher, so it can be applied to various noise sources regardless of the external environment or place where it can be exposed to moisture. can be applied. At this time, if the water repellency evaluated according to KS K ISO 4920 is less than 4 grades, the present invention may not exhibit sufficient waterproof or water repellent performance for the purpose of the present invention, and may be vulnerable to moisture penetration.

At this time, the fluorine-based compound is coated on the waterproof fabric layer 20, and water droplets on the surface of the waterproof fabric layer 20 can be used to protect the known conventional fluorine-based compound, and the non-limiting examples of the fluorine-based compound are For example, a hydroxylated perfluoroalkylethyl acrylate copolymer may be used.

In addition, in order to coat the fluorine-based compound on the waterproof fabric layer 20, a known conventional method may be used. Preferably, the fluorine-based compound is coated on the surface of the waterproof fabric layer 20 by immersing it in a water-repellent solution containing the fluorine-based compound. can make it

In addition, the flexible sound-absorbing wall 100 according to the present invention has an object of the invention to have ease of movement without increasing the weight and volume as described above, the waterproof fabric layer 20 is a separate cover may not include Accordingly, the fluorine-based compound is coated on the surface of the waterproof fabric layer 20 and does not form a separate layer or water-repellent cover.

On the other hand, the size and thickness of the waterproof fabric layer 20 is not particularly limited because it can be appropriately selected in consideration of the environment such as the type and location of the noise source, but is larger than the sound-absorbing layer 10 as a non-limiting example and protection to be described later. It may have the same size as the layer 30 and may have a thickness of 800 μm to 2000 μm.

Next, the above relational expression (4) will be described.

As described above, the flexible sound-absorbing wall 100 according to the present invention is implemented to include the sound-absorbing layer 10 and the waterproof fabric layer 20 so as to minimize the influence of the external environment with mechanical strength and waterproof properties. And at the same time, it is made of a flexible material to show flexibility, so it can guarantee the ease and flexibility of movement, and furthermore, it can exhibit excellent sound absorption in the high frequency region as in the above relation (4).

More specifically, referring to FIG. 4 , the flexible sound-absorbing wall 100 according to the present invention has a sound absorption coefficient measured according to KS F 2805:2014 of 0.6 or more in a frequency range of 2000 to 4000 Hz, preferably 0.7 or more. , most preferably 0.8 or more. That is, the flexible sound-absorbing wall 100 according to the present invention exhibits an α _s (sound absorption coefficient) value of 0.6 or more even in a high-frequency region of 2000 to 4000 Hz compared to the conventional flexible sound-absorbing wall (FIG. 5), through which 100 to It can be seen that it can be used without limitation not only in the 2000 Hz frequency range, but also in the noise source corresponding to the 2000 to 4000 Hz frequency range, which could not be covered with the conventional sound-absorbing wall (FIG. 5), so that the utility can be greatly improved.

On the other hand, in the flexible sound-absorbing wall 100 according to the present invention, as shown in FIG. 4 , the maximum value of the sound absorption coefficient in the frequency range of 100 to 5000 Hz may exist in the range of 850 to 1200 Hz. This is because the flexible sound-absorbing wall 100 according to the present invention has a maximum value of the sound absorption coefficient in the high-frequency region than the conventional flexible sound-absorbing wall shown in FIG. can

Next, the flexible sound-absorbing wall 100 according to the present invention may further include a protective layer 30 on the other surface of the sound-absorbing layer 10 .

Referring to FIG. 1 , the protective layer 30 is formed on the other side of the sound-absorbing layer 10 , that is, on the opposite surface of the waterproof fabric layer 20 , and serves to protect the sound-absorbing layer 10 . In other words, impact or moisture from the noise source is protected through the waterproof fabric layer 20 , and impact or moisture penetration from the opposite direction of the noise source can be protected through the protective layer 30 .

To this end, the protective layer 30 can prevent external impact or moisture penetration, and can be composed of known conventional fibers having flexible properties. Fiber, PU waterproof fabric, TPU waterproof fabric, etc. may be used, and more preferably, it may be implemented as a double-laminated PVC tarpaulin fiber having a thickness of 1500 denier or more. Meanwhile, the protective layer 30 may be manufactured in the form of a fabric by weaving such PVC tarpaulin fibers.

At this time, when the protective layer 30 according to a preferred example of the present invention is implemented with double laminated PVC tarpaulin fibers, the basis weight is 500 to protect the front part (opposite to the noise source) of the flexible sound-absorbing wall 100 according to the present invention. to 1000 g/m ² tarpaulin fibers may be used and more preferably It may have a basis weight of 700 to 800 g/m ² . In addition, both the tensile strength in the longitudinal direction and the tensile strength in the width direction may be 2000 N/5cm or more, and both the tear strength may be 400 N or more.

In addition, the size and thickness of the protective layer 30 is not particularly limited as it can be appropriately selected in consideration of the environment such as the type and location of the noise source, but is not particularly limited, but is larger than the sound-absorbing layer 10 and the waterproof fabric as a non-limiting example. It may have the same size as the layer 20 and a thickness of 1000 μm to 2500 μm.

On the other hand, the flexible sound-absorbing wall 100 according to the present invention is interposed between the protective layer 30 and the sound-absorbing layer 10, and reflects the noise passing through the sound-absorbing layer 10 back to the sound-absorbing layer 10. A sound insulating layer 40 may be further included.

The sound generated from the noise source passes through the waterproof fabric layer 20, and then is absorbed by the sound-absorbing layer 10. At this time, a part of the absorbed sound passes through the sound-absorbing layer 10 without being absorbed by the sound-absorbing layer 10. can do. There may be a problem that noise is not completely blocked due to the sound passing in this way and the sound insulation efficiency is reduced. The flexible sound-absorbing wall 100 according to the present invention further includes the sound-insulating layer 40, ) can be reflected from the sound insulating layer 40 back to the sound absorbing layer 10 to greatly improve the sound insulating efficiency.

To this end, the sound insulating layer 40 may be manufactured using a known material exhibiting an excellent sound insulating effect so that the sound passing through the sound absorbing layer 10 can be reflected back to the sound absorbing layer 10, and preferably PVC sound insulation material, rubber sound insulation material, etc. having an STC (Sound Transmission-loss Class) value of 20 or more indicating the sound transmission grade can be used, and more preferably, EPDM synthetic rubber having an STC value of 25 or more It can be manufactured in the form of a sheet. .

At this time, in order for the flexible sound-absorbing wall 100 according to the present invention to have a flexible property, the sound insulating layer 40 must also have excellent mechanical strength and flexibility, and the tensile strength in the longitudinal direction may be 600 N/cm ² or more. The tensile strength in the width direction may be 500 N/cm ² or more. In addition, the thermal strain may have a value of less than 0.2% in the longitudinal direction and less than 0.1% in the width direction.

In addition, the size and thickness of the sound insulating layer 40 may be appropriately selected in consideration of the environment, such as the type and location of the noise source, and is not particularly limited, but as a non-limiting example, the same size and 1 mm as the sound absorbing layer 10 . It may have a thickness of 5 mm to 5 mm.

Next, the flexible sound-absorbing wall 100 according to the present invention may include a plurality of eyelets 60 for mounting in which two holes are formed in one pair on the rim 50 .

The eyelet 60 serves as a mounting hole so that the flexible sound-absorbing wall 100 according to the present invention can be fixed to a fence, scaffold, or other support structure, and the material of the eyelet is not particularly limited, but the flexible sound-absorbing wall Considering that (100) is mostly an industrial material used outdoors, it is preferable to manufacture it with a material of stainless steel or aluminum having high corrosion resistance.

In addition, the size of the two holes of the eyelet 60 may be 20 mm or more in diameter so that cable ties, S-shaped hooks, U bolts, etc. are all compatible, and the gap between the two holes is the same as the diameter of the pipe used for the system scaffolding. and may be appropriately selected according to the structure on which the flexible sound-absorbing wall 100 according to the present invention is mounted.

Meanwhile, the edge 50 may be dissociated with a fabric for waterproofing.

That is, the flexible sound-absorbing wall 100 according to the present invention is not finished by sewing the fabrics constituting the waterproof fabric layer 20 and the protective layer 30, but is a waterproof fabric by adding a third fabric to finish sewing. The gap between the layer 20 and the protective layer 30 can be closed, so that a higher waterproof performance can be exhibited.

Hereinafter, the present invention will be described in more detail through examples, but the following examples are not intended to limit the scope of the present invention, which should be construed to aid understanding of the present invention.

Example 1 - Fabrication of a flexible sound-absorbing wall

(1) Preparation of sound-absorbing layer

Polyester sound-absorbing insulation 50T having a sound insulation performance (NRC) value of 0.82 was prepared by thermocompression bonding a polyester high tenacity yarn having a density of 40 Kg/m ² and a fineness of 5D as a sound-absorbing layer.

(2) Manufacture of waterproof fabric layer

A fabric (A848 WR) having the properties shown in Table 1 below was prepared using a polyester high tenacity yarn having a fineness of 2000 D × 2000 D denier as a waterproof fabric layer, and a fluorine-based compound (hydroxylate perfluoroalkylethyl acrylate copolymer ( Hydroxylated perfluoroalkylethyl acrylate copolymer) immersed in 25 to 35% water repellent solution, dried and heat treated for 1 minute in a 180 degree tenter to form a coating layer, and it was attached to one side of the sound-absorbing layer to be disposed in the direction of the noise source. .

(3) Preparation of protective layer

As a protective layer, using 2000 D × 2000 D denier polyester high tenacity yarn, the basis weight is 750 g/m ² , the waterproof performance is 10,000 mmH ₂ 0, and the tensile strength is 2700 N/5cm in the longitudinal direction and 2400 N in the width direction. The fabric is manufactured from PVC tarpaulin fiber (D7RV2200 TAPAULIN FABRIC) with a /5 cm, tear strength of 480 N in the longitudinal direction and 450 N in the width direction, and an adhesive strength of 104 N/5 cm in the longitudinal direction and 105 N/5 cm in the width direction. It was attached to the other side of the sound-absorbing layer so as to be disposed on the opposite side.

(4) Preparation of sound insulation layer

As a sound insulation layer, using synthetic rubber with a thermal strain rate of 0.14% in the longitudinal direction and 0.09% in the width direction, and a tensile strength of 693N/cm ² in the longitudinal direction and 550N/cm ² in the width direction, the STC performance has a value of 26. An EPDM synthetic rubber sound insulating material 2T was prepared and interposed between the sound absorbing layer and the protective layer.

Example 2 - Fabrication of a flexible sound-absorbing wall

In Example 1, (4) was prepared in the same manner as in Example 1, except that the sound insulating layer was omitted.

Example 3 - Fabrication of a flexible sound-absorbing wall

In Example 1, the waterproof fabric layer of (2) was prepared in the same manner as in Example 1, except that the fluorine-based compound coating was omitted.

Comparative Example 1

In Example 1 (2), it was prepared in the same manner as in Example 1, except that a polyurethane film laminating fiber (A142 HP5K), not a polyester high-strength yarn, was used as the waterproof fabric layer.

Comparative Example 2

It was prepared in the same manner as in Example 1, except that (2) waterproof fabric layer having an average porosity of 95% in Example 1 was prepared.

Comparative Example 3

It was prepared in the same manner as in Example 1, except that in Example 1, (2) waterproof fabric layer having an average porosity of 40% was prepared.

Comparative Example 4

It was prepared in the same manner as in Example 1, except that in Example 1, (2) a waterproof fabric layer having a basis weight of 100 g/m ² was prepared.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 sound absorbing layer O O O O O O O waterproof fabric layer fiber type Polyester Polyester Polyester polyester +
polyurethane film Polyester Polyester Polyester basis weight
(g/m ² ) 750 750 750 750 750 750 100 Tensile strength (N, warp/weft) 5300/
3900 5300/
3900 5300/
3900 5300/
3900 5300/
3900 5300/
3900 1500/
1100 Tear strength (N, warp/weft) 350/
350 350/
350 350/
350 350/
350 280/
280 350/
350 100/
100 Adhesive strength (N, warp/weft) 19/
19 19/
19 19/
19 19/
19 19/
19 19/
19 19/
19 average porosity 65 65 65 65 95 40 65 water repellency rating 4 4 One - 2 4 4 Whether it is coated with a fluorine-based compound O O X - O O O protective layer O O O O O O O sound insulation layer O X O O O O O

Experimental Example 1

In the examples and comparative examples prepared above, the sound absorption rate was measured according to KS F 2805:2014 of the flexible sound-absorbing wall made only of (1) a sound-absorbing layer and (2) a waterproof fabric layer, and it is shown in Table 2. In particular, the sound absorption rate graphs of Example 1 and Comparative Example 1 are shown in FIGS. 4 and 5, respectively.

KS F 2805:2014 measurement method (1) measures the sound absorption coefficient calculated according to the following equation (1).

[Equation 1]

는 잔향실법에 의한 흡음율이고,

is the sound absorption rate by the reverberation chamber method,

V is the volume of the empty reverberation chamber (m ³ ),

S is the area covered by the test piece (m ² ),

C ₁ , C ₂ are the speed of sound when the temperature is t ₁ , t ₂ respectively,

T ₁ is the reverberation time (s) in the empty reverberation room,

T ₂ is the reverberation time (s) in the reverberation room after installing the test piece,

m ₁ and m ₂ are the power attenuation factors (m ^-1 ) calculated according to ISO 9613-1, respectively.

Experimental Example 2

In the examples and comparative examples prepared above, (1) a sound-absorbing layer and (2) a flexible sound-absorbing wall made only of a waterproof fabric layer using the KS F 2805:2014 measurement method of Experimental Example 1 in the high-frequency region (2000, 2500) , 3150, 4000, 5000 Hz) were measured and their arithmetic mean values are shown in Table 2.

Experimental Example 3

The surface wetting resistance by water of the water-repellent fabrics of the flexible sound-absorbing walls prepared in Examples and Comparative Examples prepared above was measured using KS K ISO 4920 water repellency measurement method.

[Test method]

1) Prepare a sample with a size of 180mm x 180mm and leave it in a constant temperature and humidity room for 4 hours.

2) Mount the sample on the specimen holder with the water-repellent treated side facing up, and install it at an angle of 45 degrees to the ground.

3) Put a funnel-shaped spray on the test piece, pour 250ml of distilled water into the spray and spray on the surface of the test piece without stopping within 25s~30s.

4) After spraying is stopped, remove the specimen and holder, and turn 180 degrees to shake off the water.

5) In this state, the degree of wetness of the sample was evaluated as high or low, and it is shown in Table 2.

Experimental Example 4

The flexible sound-absorbing walls prepared in Examples and Comparative Examples were tested for durability against external damage through KS K 0536 tongue tear strength measurement method, and are shown in Table 2 below.

[Test method]

1) A 76mm x 203mm rectangular sample is left for 24 hours.

2) Cut 76mm in the center of one of the short sides of the sample so that it is perpendicular to the side.

3) Hold one side of the cut specimen in the jaw and the other in the lower jaw.

4) At a tensile speed of 300 mm/min, read the five highest peak loads until they are all torn and average.

(Upper: Tear strength greater than 300N, Middle: Tear strength less than 300N Exceeding 200N, Lower: Tear strength less than 200)

Experimental Example 5

A sound level meter ( The degree of noise reduction was measured through TES-53S, NESM-201), and it is shown in Table 2 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4

)sound absorption rate (

) 0.83 0.80 0.83 0.5 0.86 0.76 0.83 The average sound absorption coefficient in the high frequency region (

) (over 2000Hz) 0.846 0.71 0.846 0.116 0.854 0.63 0.846 resistance to external damage above above above above China above below waterproof performance above above below above China above above Noise reduction degree (dB) 17 13 17 10 18 11 17 Weight (Kg/

) 4.5 3.5 4.5 4.5 4.2 4.5 3.9

Referring to Tables 1 and 2 above,

It can be seen that in the case of Example 2 in which the sound insulating layer 40 according to the present invention is not provided, the noise reduction viscosity is significantly lowered than in Example 1.

In addition, in the case of Example 3 in which the fluorine-based compound is not coated on the waterproof fabric layer 20 according to the present invention, it can be seen that the waterproof performance is very low.

On the other hand, in the case of Comparative Example 1, which was implemented only with polyester and polyurethane film without additionally coating a fluorine-based compound on the waterproof fabric layer 20 according to the present invention, the mechanical strength is weak, so it is vulnerable to external damage, and is vulnerable to sound damage and high frequency region. It can be seen that the inclusion rate is also remarkably low.

In addition, in the case of Comparative Example 2, in which the average porosity of the waterproof fabric layer 20 according to the present invention exceeds the numerical range of the present invention, moisture penetrates into the pores, and it can be seen that both waterproof performance and mechanical strength are lowered.

In addition, in the case of Comparative Example 3, in which the average porosity of the waterproof fabric layer 20 according to the present invention is less than the numerical range of the present invention, both the sound absorption rate and the sound absorption rate in the high frequency region are low, and thus it can be seen that the noise reduction degree is also low, and the present invention In the case of Comparative Example 4, in which the basis weight of the waterproof fabric layer 20 according to the present invention is out of the numerical range of the present invention, the mechanical strength is significantly lower, the tensile strength and the tearing strength are low, and thus it can be seen that it is vulnerable to external damage.

In the end, only when both the configuration and the numerical range according to the present invention are satisfied, the influence by the external environment can be minimized by having sufficient mechanical strength and waterproofness, ease of movement and flexibility are guaranteed, and furthermore, the sound absorption rate in the high frequency range is improved. It can be seen that there is a marked improvement.

Claims (9)

sound absorbing layer; and
a waterproof fabric layer disposed in the direction of the noise source for sound absorption on one surface of the sound-absorbing layer; including,
The waterproof fabric layer has a basis weight of 1000 g/m ² or less,
The fineness of the yarn constituting the waterproof fabric layer is 1500 to 2500 denier,
The waterproof fabric layer is a flexible sound-absorbing wall that satisfies all of the following relational formulas (1) to (4) coated with a fluorine-based compound.
(1) The waterproof fabric layer has a tensile strength in the weft direction and a tensile strength in the warp direction of 3500N or more
(2) the waterproof fabric layer has an average porosity of 60 to 90%
(3) The waterproof fabric layer has a water repellency rating of 4 or higher evaluated according to KS K ISO 4920
(4) The flexible sound-absorbing wall is a flexible sound-absorbing wall, characterized in that the sound absorption coefficient measured according to KS F 2805:2014 is 0.6 or more in the frequency range of 2000 to 4000 Hz.
delete delete According to claim 1,
The waterproof fabric layer is a flexible sound-absorbing wall, characterized in that it does not include a separate cover.
According to claim 1,
The waterproof fabric layer is a flexible sound-absorbing wall, characterized in that woven with polyester fibers.
According to claim 1,
Flexible sound-absorbing wall, characterized in that it further comprises a protective layer on the other side of the sound-absorbing layer.
7. The method of claim 6,
Interposed between the protective layer and the sound-absorbing layer,
Flexible sound-absorbing wall, characterized in that it further comprises a sound-insulating layer that reflects the noise that has passed through the sound-absorbing layer back to the sound-absorbing layer.
8. The method of claim 7,
The sound insulating layer is a flexible sound-absorbing wall, characterized in that the sound transmission class STC (Sound Transmission-loss Class) value of 20 or more.
According to claim 1,
The flexible sound-absorbing wall includes a plurality of eyelets for mounting on the rim,
The rim is a flexible sound-absorbing wall, characterized in that the dissociation finish with a fabric for waterproofing.

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