KR20240059049A - Sound absorbing structure - Google Patents

Abstract

The present invention relates to a sound-absorbing structure, and more specifically, to a sound-absorbing structure installed on a ceiling, etc. In order to achieve the above technical problem, one embodiment of the present invention is a sound-absorbing structure, which includes at least one selected from the group consisting of cellulose fiber, viscose rayon, cotton, and hemp, and has a weight per unit area of 200 to 700 g/m². A nonwoven fabric (100) having a; A shaking plate 200 installed on one side of the non-woven fabric 100 and formed as a thin film of 10 to 1000 μm thick and containing at least one selected from the group consisting of paper, vinyl, and metal materials; A partition wall structure layer 300 installed on one side of the vibration plate 200 and including a plurality of spaces 310; It provides a sound-absorbing structure comprising a.

Description

Sound absorbing structure

The present invention relates to a sound-absorbing structure, and more specifically, to a sound-absorbing structure that is installed on a wall or ceiling and includes non-woven fabric.

In general, as a composite material for building materials and automobile interior materials that have effects such as insulation and sound absorption, mineral wool or glass wool are mainly used. However, in the case of rock wool or glass fiber, the manufacturing process and construction In the process, ingredients that are harmful to the environment and unsafe to the human body are released, so their use is being excluded. Below we introduce related prior literature. The identification codes in the following prior documents are unrelated to the present invention.

Republic of Korea Patent No. 10-0903559, 'Nonwoven sound-absorbing material', relates to a sound-absorbing material made using microfiber nonwoven fabric as a base material, and contains a certain content of hollow fiber conjugate inside a meltblown nonwoven fabric made of bicomponent microfiber material. A melt-blown nonwoven fabric made of bicomponent microfibers with a dense tissue structure made of hollow fiber conjugate single fibers with a large surface area per unit weight and excellent sound absorption due to the formation of cavities, with very small porosity between fibers. A distributed technology has been disclosed.

Republic of Korea Patent No. 10-1672461, 'Molten cellulose-based meltblown fiber composition for sound-absorbing nonwoven fabric, molten cellulose ultrafine nonwoven fabric using the same, and method of manufacturing the same' relates to a molten cellulose ultrafine nonwoven fabric composition, a molten cellulose ultrafine nonwoven fabric, and a method of manufacturing the same. , A composition for providing a fused cellulose ultrafine nonwoven fabric containing fiber aggregates with pores in the fiber and a bulky structure, an ultrafine nonwoven fabric manufactured using the same, and a method for manufacturing the same, and furthermore, technology regarding applied products thereof. has been initiated.

However, it was difficult to expect sufficient sound absorption effect only with the nonwoven fabric of No. 10-0903559 or No. 10-1672461.

Republic of Korea Patent No. 10-0903559 ‘Non-woven sound absorbing material’ Registration date: June 11, 2009 Republic of Korea Patent No. 10-1672461 ‘Melted cellulose-based meltblown fiber composition for sound-absorbing nonwoven fabric, fused cellulose ultrafine nonwoven fabric using the same, and method of manufacturing the same’ Date of registration: October 28, 2016

The technical problem to be achieved by the present invention is to provide a sound-absorbing material that can be attached to a wall or ceiling, is simple to construct, and can provide a sufficient sound-absorbing effect.

In most of the conventional sound-absorbing structures, the air gap that induces sound absorption is constant and wide, and as it is unable to absorb sound in the entire range, it causes selective sound absorption, and the sound in the mid-low range remains intact and is reflected, causing distortion of the original sound. This happens. (c.f In order to solve the reflection problem in the mid-low range, a separate absorption device such as a bass trap is often installed)

There are products that are used as ceiling materials by drilling small holes in some aluminum plates, but since the holes are of one size, it is not easy to absorb the entire area. When used on the ceiling, etc., dust falls into the room, and the high unit price of raw materials and manufacturing costs. This was a high issue.

In addition, in the case of conventional sound-absorbing structures, most of them are made of one material and are installed on the wall, but this causes the problem of reducing the usable space, so it is not possible to provide a sufficient rear air layer essential for sound absorption.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

In order to achieve the above technical problem, one embodiment of the present invention is a sound-absorbing structure, which includes at least one selected from the group consisting of cellulose fiber, viscose rayon, cotton, and hemp, and has a weight per unit area of 200 to 700 g/m². A nonwoven fabric (100) having a; A shaking plate 200 installed on one side of the non-woven fabric 100 and formed of a thin film of 10 to 1000 μm thick made of one or more materials selected from the group consisting of paper, vinyl, and metal materials; A partition wall structure layer 300 installed on one side of the vibration plate 200 and including a plurality of spaces 310; It provides a sound-absorbing structure comprising a.

According to an embodiment of the present invention, a sound-absorbing material that can be attached to a wall or ceiling, is easy to construct, and can provide a sufficient sound-absorbing effect is provided. In particular, sound in a wide range of mid-low and high pitches flows in through the fine porous surface, which is a unique feature of natural fiber materials, and the gaps between fibers obtained when making non-woven fabrics, and then passes through a thin diaphragm before reaching the space. By forming this, the incoming sound energy is weakened through the vibration of the membrane, and a sufficient background air layer is provided through the space of the partition structure layer, which is sufficient to control an even and stable indoor acoustic environment across the entire frequency range and effectively absorbs sound. You can expect the following effect.

On the other hand, when installing the sound-absorbing structure of the present invention on the ceiling, it can be attached to the surface where the Tex stretched over the M bar or T bar is placed in order to attach it to a general ceiling material, and it can be installed so that there is no height difference from the conventional ceiling material. It has the advantage of achieving sufficient sound absorption effect.

The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

Figure 1 is an exploded perspective view for explaining the structure of the sound-absorbing structure of the present invention.
Figure 2 is a cross-sectional view of the main part to explain the sound-absorbing effect of the sound-absorbing structure of the present invention.
Figure 3 is an exploded perspective view for explaining an embodiment in which the plate-shaped mesh structure molded body of the sound-absorbing structure of the present invention is applied.

Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention may be implemented in various different forms and, therefore, is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts unrelated to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this means not only "directly connected" but also "indirectly connected" with another member in between. "Includes cases where it is. Additionally, when a part is said to “include” a certain component, this does not mean that other components are excluded, but that other components can be added, unless specifically stated to the contrary.

The terms used in this specification are merely used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that it does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

As for the absorption of sound, the smaller the pore size and the more diverse the size of the pores, the more evenly the sound of a wide range of frequencies is absorbed, eliminating the distortion of the sound that has been reduced after absorption, and the sound flowing into the background air layer is absorbed into the space. This reflects that the offsetting effect increases depending on the size of . In particular, in the case of walls, most people do not want to reduce the usable space to provide a sufficient air gap behind them, so a perforated plate with a honeycomb structure is used to secure the back air gap, or when installing on the ceiling, there is a space between the half and the ceiling. If there is one, it can be used as a background air layer to effectively absorb sound. Accordingly, the present invention provides a technology for combining the above honeycomb structured perforated plate and non-woven fabric when attached to a wall, and a non-woven fabric and a sound-absorbing induction layer when installed on a ceiling.

Figure 1 is an exploded perspective view for explaining the structure of the sound-absorbing structure of the present invention. As shown in Figure 1, the present invention is a sound-absorbing structure, including at least one selected from the group consisting of cellulose fiber, viscose rayon, cotton, and hemp, and a nonwoven fabric ( 100) and; A shaking plate 200 installed on one side of the non-woven fabric 100 and formed as a thin film of 10 to 1000 μm thick and made of at least one material selected from the group consisting of paper, vinyl, and metal; A partition wall structure layer 300 installed on one side of the vibration plate 200 and including a plurality of spaces 310; It provides a sound-absorbing structure comprising a.

The nonwoven fabric 100 prevents deterioration of the interior quality caused by the sound-absorbing structure of the present invention, and serves to disperse sound and guide the sound into the internal air layer. If necessary, an adhesive film can be formed on the back side, and the adhesive film can prevent contamination of the non-woven fabric due to the inflow and outflow of indoor air mixed with dust penetrating the sound-absorbing structure. The adhesive film can be installed with a thickness of 10 to 50 μm.

In addition, the nonwoven fabric 100 preferably contains a flame retardant to minimize fire damage in the event of a ceiling fire. The flame retardant may be a halogen-based flame retardant, a phosphorus-based flame retardant, an inorganic flame retardant, or a flame retardant synergist.

More preferably, the nonwoven fabric 100 includes a flame retardant composition for cellulose fibers impregnated in a base sheet formed of cellulose fibers, and the flame retardant composition for cellulose fibers includes ammonium sulfate (Diazanium sulfate), pentaerythritol, and phosphoric acid. An eco-friendly composite material based on cellulose fibers containing ammonium phosphate, boric acid, and binder not only provides excellent flame retardancy and sound absorption, but also improves the adhesion between the cellulose fiber and the flame retardant composition, improving flame retardancy and sound absorption. The sustainability can be excellent.

In particular, the flame retardant composition contains both ammonium sulfate and ammonium phosphate, and when the two components are exposed to heat of 80 to 280 ° C, they perform a dehydration carbonization effect while simultaneously discharging ammonia gas and water, thereby helping to extinguish the fire, thereby providing flame retardant properties. can be further improved. In particular, the flame retardant composition of this embodiment hardly emits carbon monoxide, which is a combustible gas, even when exposed to heat, thereby preventing problems such as expansion of combustion and poisoning due to carbon monoxide inhalation. That is, the flame retardant composition of this embodiment can be environmentally friendly by minimizing the generation of toxic gases such as carbon monoxide.

More specifically, the flame retardant composition contains 10 to 20% by weight of ammonium sulfate, 1 to 8% by weight of pentaerythritol, 15 to 25% by weight of ammonium phosphate, 7 to 15% by weight of boric acid, and 3 to 8% by weight of binder, based on the total weight of the flame retardant composition. % and the balance may include water.

The binder may include one or more selected from the group consisting of vinyl acetate-ethylene copolymer (Ethylene Vinyl Acetate) and water-soluble styrene butadiene rubber. More specifically, vinyl acetate-ethylene copolymer (Ethylene Vinyl Acetate) and water-soluble styrene butadiene rubber may be included in a weight ratio of 1:5 to 15.

The vibration plate 200 reduces sound energy through vibration and transmits the sound to the plurality of spaces 310 of the partition wall structure layer 300. The shake plate 200 contains one or more materials selected from the group consisting of paper, vinyl, and metal materials and is formed as a thin film with a thickness of 10 to 1000㎛, and is especially preferably a metal thin film of aluminum or aluminum alloy.

The above-mentioned partition wall structure layer 300 preferably has a honeycomb-shaped partition wall, and provides sufficient space 310 and a rear air layer for sound cancellation. In particular, the space portion 310 of the honeycomb structure is advantageous for destructive interference of sound waves within the space by allowing sound to flow into the space.

Figure 2 is a cross-sectional view of the main part to explain the sound-absorbing effect of the sound-absorbing structure of the present invention. As shown in Figure 2, sound (sound waves) emitted from a sound source is diffracted as it passes through gaps between fibers of various diameters in the sound-absorbing layer of the non-woven fabric 100.

The dispersed and diffracted sound waves are weakened as they pass through the diaphragm 200, and after flowing into the space 310 of the partition structure layer 300, the intensity of the sound waves is greatly weakened through destructive interference.

This sound-absorbing structure has the advantage of being able to effectively absorb sounds of various sound ranges.

Figure 3 is an exploded perspective view for explaining an embodiment in which the plate-shaped mesh structure molded body of the sound-absorbing structure of the present invention is applied. In the ceiling installation example of Figure 3, the required acoustic level in the room varies depending on the use, so in order to increase the interior effect of the ceiling, the shaker plate is installed to prevent a step between the structure that prevents sound absorption (existing ceiling tex) and the sound-absorbing structure. A plate-shaped mesh structure molded body 400 that supports the nonwoven fabric 100 and the shaker plate 200 is installed between (200) and the partition wall structure layer 300.

The plate-shaped mesh structure molded body 400 is a wire mesh or a perforated metal plate, and may be manufactured from materials such as aluminum, iron alloy, or Zn-Al alloy plated steel sheet. The plate-shaped mesh structure molded body 400 increases the gap between the non-woven fabric 100 and the partition wall structure layer 300, thereby inducing sound waves to flow into the space 310 of the honeycomb structure, and the vibration plate 200 and It serves to support the nonwoven fabric (100).

That is, according to the present invention, a wide range of sound, ranging from mid-low to high tones, is introduced through the porous surface with fine holes of various diameters, which are unique characteristics of natural fiber materials, and the pores resulting from the gaps between fibers obtained when making non-woven fabric. Then, by forming a thin shaking plate before reaching the space, the incoming sound energy is weakened through the vibration of the membrane. In addition, by providing a sufficient rear air layer through the space of the partition structure layer, the effect of evenly and effectively absorbing sound across the entire frequency range can be expected.

Hereinafter, manufacturing examples and experimental results related to adhesion, flame retardancy and sound absorption of a non-woven fabric-type base sheet containing a flame retardant composition for cellulose fibers impregnated with a base sheet formed of cellulose fibers will be described in detail.

[Manufacturing example]

Examples 1 to 5

A flame retardant composition was prepared according to Table 1 [unit: weight %], and the binder in Table 1 was a mixture of vinyl acetate-ethylene copolymer and water-soluble styrene butadiene rubber according to Table 2 [unit: weight ratio].

Specifically, ammonium sulfate was added and stirred to water at 40 to 42 ℃, the temperature of the mixture was heated to 52 to 54 ℃, pentaerythritol was added and stirred, and the temperature of the mixture was warmed to 59 to 61 ℃. Then, ammonium phosphate was added and stirred, and finally, the temperature of the mixture was heated to 74-76°C, and boric acid and a binder were added and stirred to prepare a flame retardant composition.

A composite material (sample weight: 180 g/m ² ) that can be used as an interior finishing material was prepared by impregnating and curing the flame retardant composition prepared as above into a non-woven fabric-type base sheet (thickness: 3.5 mm) made of cellulose fibers. .

Examples 1 to 5 ammonium sulfate 17.0 Pentaerythritol 6.0 ammonium phosphate 20.0 boric acid 13.0 bookbinder 7.0 water To.100

Example 1 Example 2 Example 3 Example 4 Example 5 Vinyl acetate-ethylene copolymer One One One One One Water Soluble Styrene Butadiene Rubber One 5 12 15 20

At this time, the vinyl acetate-ethylene copolymer in Table 2 was used having a weight average molecular weight of 20,000 to 30,000 g/mol.

[Comparative example]

Comparative Examples 1 to 12

The same procedure as Example 3 was carried out, except that the flame retardant composition was prepared according to Table 3 [unit: weight %] and Table 4 [unit: weight %].

Comparative Example 1 Comparative example 2 Comparative example 3 Comparative example 4 Comparative Example 5 Comparative Example 6 ammonium sulfate 5.0 25.0 17.0 17.0 17.0 17.0 Pentaerythritol 6.0 6.0 6.0 6.0 0.1 15.0 ammonium phosphate 20.0 20.0 20.0 20.0 20.0 20.0 boric acid 13.0 13.0 13.0 13.0 13.0 13.0 bookbinder 7.0 7.0 7.0 7.0 7.0 7.0 water to.100

Comparative example 7 Comparative example 8 Comparative Example 9 Comparative Example 10 Comparative Example 11 Comparative Example 12 ammonium sulfate 17.0 17.0 17.0 17.0 17.0 17.0 Pentaerythritol 6.0 6.0 6.0 6.0 6.0 6.0 ammonium phosphate 10.0 30.0 20.0 20.0 20.0 20.0 boric acid 13.0 13.0 2.0 18.0 13.0 13.0 bookbinder 7.0 7.0 7.0 7.0 1.0 13.0 water to.100

Comparative Example 13

The same procedure as Example 3 was carried out, except that only vinyl acetate-ethylene copolymer was included as a binder (X including water-soluble styrene butadiene rubber).

Comparative Example 14

The same procedure as Example 3 was carried out, except that only water-soluble styrene butadiene rubber was included as a binder.

Comparative Example 15

The same procedure as Example 3 was performed, except that a vinyl acetate-ethylene copolymer with a weight average molecular weight of 100,000 to 150,000 g/mol was used.

[Experimental example]

Experimental Example 1: Adhesion evaluation

Only the flame retardant compositions used in the preparation of the above Examples and Comparative Examples were separately taken and their adhesiveness was evaluated.

Specifically, according to the cross-cut test method (ASTM D 3359 test standard), the adhesion of the flame retardant compositions according to Examples and Comparative Examples was evaluated according to the following criteria, and the results are shown in Table 5.

At this time, Table 5 shows the average value of five repeated experiments, which means that 5B has the best adhesion.

0B: Separated area is more than 65%

1B: Separated area is 35 to 65%

2B: Separated area is 15 to 35%

3B: Separated area is 5 to 15%

4B: Separated area is less than 5%

5B: Separated area is 0%

adhesiveness adhesiveness Example 1 4.0 Comparative Example 6 1.4 Example 2 4.6 Comparative example 7 4.0 Example 3 5.0 Comparative example 8 2.0 Example 4 4.6 Comparative Example 9 2.6 Example 5 4.0 Comparative Example 10 2.6 Comparative Example 1 4.0 Comparative Example 11 1.4 Comparative example 2 2.0 Comparative Example 12 2.0 Comparative example 3 4.0 Comparative Example 13 2.4 Comparative example 4 2.0 Comparative Example 14 2.4 Comparative Example 5 2.0 Comparative Example 15 2.6

Looking at Table 5, it can be seen that according to this example, the adhesiveness of the flame retardant composition is significantly excellent.

Experimental Example 2: Flame retardancy evaluation

(1) Flame retardancy evaluation 1

The flame retardancy of the composite materials according to Examples and Comparative Examples was measured according to the KS F 2805:2004 test method.

At this time, Table 6 lists the flame retardancy (A) measured without any additional treatment after manufacturing the composite material, and the flame retardancy (B) measured after repeating the process of crumpling and bending the composite material about 100 times. did.

(A) (B) (A) (B) Example 1 2 2 Comparative Example 6 3 3 Example 2 2 2 Comparative example 7 3 3 Example 3 2 2 Comparative example 8 2 3 Example 4 2 2 Comparative Example 9 3 3 Example 5 2 2 Comparative Example 10 2 3 Comparative Example 1 3 3 Comparative Example 11 3 3 Comparative example 2 2 3 Comparative Example 12 3 3 Comparative example 3 3 3 Comparative Example 13 3 3 Comparative example 4 2 3 Comparative Example 14 3 3 Comparative Example 5 3 3 Comparative Example 15 3 3

Looking at Table 6, it can be seen that according to this embodiment, the flame retardancy is all grade 2 or higher, realizing a semi-non-flammable level.

In addition, according to this example, the flame retardancy is maintained without deterioration even after bending and bending the composite material several times, and the flame retardant composition according to this example has excellent adhesion to the base sheet formed of cellulose fibers. can be seen.

(2) Flame retardancy evaluation 2

The composite materials of Examples and Comparative Examples were exposed to about 800° C. for 120 seconds under room temperature conditions using a pocket jet jet torch (GF-863), and changes were observed with the naked eye. The results are shown in Figure 1. Shown in to 4.

At this time, Figures 1 to 4 show the results in Table 7.

Related drawings Related drawings Example 3 Figure 1 Comparative Example 9 Figure 3 Comparative Example 1 Figure 2 Comparative Example 12 Figure 4

Referring to Figure 1, in the case of this embodiment, scorching occurred due to exposure to fire, but no holes were created by burning. On the other hand, in the case of Comparative Examples 1, 9, and 12, which did not follow this example, it was confirmed that charring occurred and at the same time, burning holes were created. That is, it can be seen that according to this embodiment, flame retardant performance is more excellent.

Experimental Example 3: Sound absorption evaluation

The sound absorption coefficient of the composite materials of Examples and Comparative Examples was evaluated according to KS F 2805:2014, and the average value of the results repeated 5 times is shown in Table 8 [unit: seconds]. At this time, Table 8 lists the average value of the results repeated five times, but only to two decimal places.

Reverberation time Reverberation time Example 1 0.36 Comparative Example 6 0.20 Example 2 0.46 Comparative example 7 0.10 Example 3 0.56 Comparative example 8 0.10 Example 4 0.46 Comparative Example 9 0.20 Example 5 0.36 Comparative Example 10 0.20 Comparative Example 1 0.10 Comparative Example 11 0.16 Comparative example 2 0.20 Comparative Example 12 0.20 Comparative example 3 0.16 Comparative Example 13 0.20 Comparative example 4 0.20 Comparative Example 14 0.20 Comparative Example 5 0.10 Comparative Example 15 0.22

Looking at Table 8, it can be seen that according to this example, sound absorption is excellent.

Although the present invention has been described with the accompanying drawings, this is only one example among various embodiments including the gist of the present invention, and is intended to enable those skilled in the art to easily implement the present invention. For this purpose, it is clear that the present invention is not limited to the embodiments described above. Therefore, the scope of protection of the present invention should be construed in accordance with the claims below, and all technical ideas within the equivalent scope by changes, substitutions, substitutions, etc. within the scope without departing from the gist of the present invention are the rights of the present invention. will be included in the scope. In addition, it should be clarified that some of the configurations in the drawings are provided in an exaggerated or reduced form than the actual figure for the purpose of explaining the configuration more clearly. In addition, the claim symbols are only for aiding understanding and do not mean that the shape and structure of the present invention is limited to the attached drawings.

100: non-woven fabric 200: shaker plate
300: partition wall structure layer 310: space part
400: Membrane structure molded body

Claims (3)

In the sound-absorbing structure,
Nonwoven fabric (100) containing one or more selected from the group consisting of cellulose fiber, viscose rayon, cotton, and hemp, and having a weight per unit area of 200 to 700 g/m²;
A vibration plate 200 is installed on one side of the nonwoven fabric 100 and includes at least one selected from the group consisting of paper, vinyl, and metal materials, and is formed as a thin film with a thickness of 10 to 1000 μm; and
A partition wall structure layer 300 installed on one side of the vibration plate 200 and including a plurality of spaces 310;
A sound-absorbing structure comprising:
According to paragraph 1,
The partition structure layer 300 is a plate-shaped structure with a thickness of 1 to 100 mm having a partition structure, and is a sound-absorbing structure manufactured by including at least one selected from the group consisting of paper, plastic, and metal.
According to paragraph 1,
A sound-absorbing structure that is installed between the vibration plate 200 and the partition wall structure layer 300 and includes a plate-shaped mesh structure molded body 400 that supports the non-woven fabric 100 and the vibration plate 200. .