KR20170075245A

KR20170075245A - Construction Noise Prevention Panel and Manufacturing Method thereof

Info

Publication number: KR20170075245A
Application number: KR1020150184644A
Authority: KR
Inventors: 박병은
Original assignee: 서울시립대학교 산학협력단
Priority date: 2015-12-23
Filing date: 2015-12-23
Publication date: 2017-07-03

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a soundproof panel for a building which can be used for a building or other structure, and a manufacturing method thereof. The soundproof panel for construction according to the present invention is in the form of a rectangular or square plate, and is composed of a mixture containing wood pulverized material and a binder, and the mixture has a weight of 650 g to 1 Kg when the size of the plate is 300 mm x 300 mm x 10 mm Is set to a positive value.

Description

Technical Field [0001] The present invention relates to a soundproof panel for a building,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a soundproof panel for a building which can be used for a building or other structure, and a manufacturing method thereof.

Recently, interest in environmental noise has become very high. Conventionally, environmental noise has been mainly caused by noise generated from machinery such as factories, noise generated from transportation means such as automobiles or airplanes, or noise generated from construction or civil works. In recent years, however, high-rise buildings such as apartments have become common, and the interstory noise has been raised as a bigger social problem. There are active discussions on ways to solve these problems and legal institutionalization.

1 is a cross-sectional view showing an example of a building construction standard that is currently standardized. 1, the lightweight foamed concrete layer 2 and the finish mortar layer 3 are sequentially laminated on the upper side of the concrete slab layer 1. A sound insulating mat (4) is provided between the concrete slab layer (1) and the lightweight foamed concrete layer (2) for noise shielding, and a side buffer material (5) is provided between the laminate and the side wall.

The sound insulating mat 4 is for blocking the noise generated in the upper layer from being transmitted to the lower layer through the medium of the building, and it is mainly composed of a material capable of absorbing sounds.

In the current construction standard shown in the drawing, the noise generated in the upper layer is absorbed through the sound-insulating mat 4, and the shock absorbing material 5 is installed on the inner side wall of the side wall so that the impact applied to the closed mortar layer 3 To the neighboring space.

Korean Utility Model Registration No. 20-0379075 discloses a noise preventing member having a sound absorbing and sound insulating effect by using first and second foam layers having different densities, respectively. This is constructed by stacking foamed porous layers having different densities to disperse vibration to prevent noise.

BACKGROUND ART As a conventional soundproofing material, a foamed sheet mainly foamed with an organic material is used. However, such a soundproofing material has a disadvantage that it can not provide a good sound and sound absorption function for a low-frequency sound range, which is a problem in interlayer noise, because it has sound insulation and sound absorption function mainly for noise in a high frequency range.

In addition, since the conventional soundproofing material uses a sheet of foamed organic material, it is very vulnerable to heat and fire, which may adversely affect the entire building if it is fired.

The present invention has been made in view of the above circumstances, and it is a technical object of the present invention to provide a soundproof panel for a building and a method of manufacturing the same that can be used in a building to reduce noise to the utmost.

A soundproof panel for building according to a first aspect of the present invention for realizing the above object comprises a rectangular or square plate shape and includes a laminated structure of a first member and a second member, Wherein the first member has a density different from that of the first member, and the first mixture has a density of 650 g / m < 2 > or more when the size of the plate is 300 mm x 300 mm x 10 mm, Is set to an amount of 1 kg.

And the first binder is a water-soluble organic binder.

And the first binder is mixed with a flame retardant.

Further, the first mixture may further include a porous ceramic.

And the second member is composed of a second mixture comprising a second wood pulverizer and a first binder, wherein the first wood pulverizer and the second wood pulverizer are obtained from woods having different tissue densities do.

Further, the second member is constituted by a third mixture comprising the first wood pulverizer and the second binder, and the first binder and the second binder are different from each other.

And the second member is constituted by a first mixture comprising the first wood pulverizer and the first binder and the second member is set to an amount of mixture having the same volume as the first member and of different weights .

And the second member is formed of an organic foam foam.

And a porous ceramic is further mixed in the second mixture.

And a porous ceramic is further mixed in the third mixture.

A method for manufacturing a soundproof panel for building according to a second aspect of the present invention comprises the steps of: And the second member is composed of a foam layer, and the binder is a water-soluble organic binder.

According to a third aspect of the present invention, there is provided a method of manufacturing a soundproof panel for a building, comprising the steps of preparing a wood pulverized product, mixing the wood pulverized material with a binder to form a mixture, and rolling or compressing the mixture to form a square or rectangular Wherein the mixture is set in an amount of 650 g to 1 kg when the size of the plate is 300 mm x 300 mm x 10 mm.

And further comprising the step of adsorbing the flame retardant to the wood pulverized product before the step of forming the mixture.

And further mixing the binder with a flame retardant.

And further adding a porous ceramic when the wood pulverized product and the binder are mixed.

A soundproof panel for a building according to the present invention realizes a soundproof panel for a building having a high sound absorption rate and a lightweight but excellent mechanical strength.

1 is a sectional view showing an example of a general construction construction standard.
2 is a perspective view showing an outer shape of a soundproof panel for construction according to a first embodiment of the present invention;
3 is an explanatory view for explaining sound absorption and sound insulation functions of a soundproof panel according to the present invention;
4 is a perspective view showing an outer shape of a soundproof panel for construction according to a second embodiment of the present invention;
5 is a perspective view showing an outer shape of a soundproof panel for construction according to a third embodiment of the present invention.
Fig. 6 is an exploded perspective view of a soundproof panel for construction shown in Fig. 5; Fig.
7 is a sectional view taken along the line A-A 'of the soundproof panel in Fig. 5;

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. However, the embodiments described below are illustrative of one preferred embodiment of the present invention, and examples of such embodiments are not intended to limit the scope of the present invention.

The basic concept of the present invention will be described.

Generally speaking noisy, if you zoom in more than you do not want to sound called noise. Generally, a sound insulating material, a sound insulating material, a sound absorbing material, or the like is employed as means for removing noise. A sound insulation material refers to a material that prevents sound from leaking out or coming in, a sound absorption material refers to a material that absorbs sound, and a sound insulation material refers to a material that prevents sound from being transmitted to another space. These names are convenience distinguishments of the same materials on the basis of their function, and they are all based on substantially the same physical characteristics, except for special configurations. Materials having physical properties such as soundproofing materials, sound insulating materials and sound absorbing materials include mostly porous structures. For example, there is a special configuration that does not have such a constitutional feature, for example, to generate sound waves having electrical phases opposite to those of ambient noise to remove noise.

In the present invention, all functional expressions such as sound insulation, sound insulation and sound absorption are collectively referred to as sound insulation, and all materials including a porous structure such as a soundproofing material, a sound insulating material, and a sound absorbing material that provide such functions will be collectively referred to as soundproofing panels. The sound insulation panel referred to herein is not limited to the function of blocking sound from leaking out or coming in only on the basis of a specific space. The soundproof panel in this specification is provided with a function of providing soundproofing, sound insulation and sound absorption function by being installed inside or outside the vertical wall of the building, or on the lower side or the upper side of the ceiling, Which is installed on the upper side of the building, and effectively removes the interlayer noise of the building.

The soundproofing panels currently used in buildings include a large number of pores. The sound insulation capacity of the pore is directly related to the pore size. The smaller the size of the pore, the better the soundproofing ability against the noise of the low sound. The larger the pore size, the higher the soundproofing ability against the noise of the high frequency sound. At present, a foamed resin foamed with an organic material is mainly used as a soundproof panel. When the organic material is foamed, a large amount of pores are formed in the foaming process, and the foamed resin exhibits a soundproof effect by these pores. However, since the pores provided in the foamed resin are set to have a size of about several tens of micrometers or more, they are disadvantageous in that they are insufficient for use as a soundproof panel, particularly a soundproof panel for low-frequency noise.

In addition, the conventional foamed resin has a problem that it is insufficient for use as a soundproof panel because its mechanical strength is so weak that it breaks easily to an external impact.

The present inventor has studied a method of utilizing wood among building materials as a soundproof panel. The wood or wood is composed of a fiber structure, a water tube is formed inside, and a plurality of pore layers are formed in the fiber structure. In addition, the wood or wood has the same texture. Pores and wood grain in wood or wood are very effective in providing soundproofing.

Currently, there is a soundproofing panel using wood as a board. Woody boards are made by processing wood to form hair-like woods, which are then joined together using a binder to form a board. Woody boards have been developed as sound absorbing materials. However, the wool board simply forms a large amount of pores between the wool through the coupling of the wool, and provides a soundproof effect by utilizing the step between the pores and the wool. Woody boards do not take into account the sound insulation effect of the pores and wood grain inherent in the wood. Woody boards are a major aspect of using wood, an environmentally friendly material, to form pores.

Woody boards also use wood, which is formed by processing ordinary wood or wood. Wood is very expensive compared to foaming resins. Therefore, there is a problem that a soundproof panel using wood is expensive.

Trees and timber are inevitably subject to sanctions to utilize them as materials. A large amount of sawdust is produced in this process. Sawdust preserves original pores and wood grain. Therefore, efficient joining of sawdust can form a very effective soundproof panel by forming a large amount of pores between the sawdust while maintaining the fine pores and wood grain of the wood. Such effective utilization can be equally applied to wood chips or wood chips that are finely pulverized with sawdust.

Sawdust is also widely used as lumber for livestock farms in livestock farms, and recently it has been processed into wood pellets and used as fuel. When a soundproof panel is manufactured using sawdust or wood flour, it is possible to utilize sawdust or wood flour, which has been merely used as a by-product of wood or wood, as an effective building material, so that high added value of sawdust or wood flour can be achieved.

Currently, there is synthetic wood as a way to recycle sawdust or wood flour as a material. Synthetic wood, unlike wood board, uses sawdust or finely pulverized wood flour. Synthetic wood is formed by mixing wood powder with a binder and compressing it at high pressure. Synthetic wood is heavy and has high strength. It is mainly used as low cost furniture and building materials as a substitute for wood. Since the synthetic wood is compressed to a very high strength, there is little porosity. Synthetic wood is not used as a soundproofing panel.

The present inventors provide an effective sound insulation panel by a method of forming a large amount of stationary air layer on a sheet material when joining sawdust or wood powder to form a sheet material.

2 is a perspective view showing an outer shape of a soundproof panel 10 for construction according to the first embodiment of the present invention. The soundproof panel 10 for building according to the present invention is formed in the shape of a square or a rectangular plate, and the main material is composed of wood pulverized material such as sawdust or wood powder.

In general, when wood or wood is applied, wood chips of various particle sizes, usually called sawdust, are formed, and if necessary, these sawdust or wood or wood are crushed to form wood flour. Also, if necessary, wood or wood may be pulverized to form wood pulverized material of uniform size. Hereinafter, such sawdust or wood flour or by-products of wood or wood are collectively referred to as wood pulverized product.

In the case of using a wood pulverized material to form a plate material, the wood pulverized material and the binder are first mixed to form a mixture, that is, a molding material, and then the molding material is rolled or compression molded. As the binder, an organic binder of thermosetting or thermoplastic resin type is preferably employed. The binder may contain a phosphorus or halogen-based flame retardant, a heat resistant material such as talc or pyrophyllite, a refractory substance, a filler such as a pigment, a dye, an inorganic substance, or a dispersant if necessary.

The amount of the binder is about 25 to 50% by weight depending on the type of the binder and the type of the wood pulverized product. Further, in the case of molding the plate material, the amount of the molding material is appropriately set corresponding to the size of the plate material. If the amount of the molding material per unit volume is set too high, the density of the sheet material is increased, and the amount of the pores is greatly decreased. If the amount of the molding material is set too small, the molding can not be performed well. When the size of the plate material is, for example, 300 mm x 300 mm x 10 mm, the amount of the molding material is set to approximately 650 g to 1 Kg. The forming temperature is set to, for example, about 90 to 185 degrees.

Further, a water-soluble organic binder may be preferably employed as the binder. The water-soluble binder is capable of effectively increasing the pore volume of the sheet material by forming a large amount of pores in the sheet material while moisture is discharged to the outside when rolling or compressing the wood pulverized material.

Also, a method of increasing the flame retardancy of the soundproof panel by adsorbing the flame retardant to the wood pulverized material before mixing the wood pulverized material and the binder can be preferably employed.

The soundproof panel for building according to the present embodiment has the following features.

1. Sound absorption rate is high.

As described above, the wood pulverized product contains pores and wood grain inherent in the wood. In this embodiment, the wood pulverized material is combined with a large amount of pores to form a plate material. Therefore, the soundproof panel according to the present embodiment includes a large number of pores formed in the process of forming the plate material together with the fine pores originally formed of the wood, and the size of the pores can be varied to various sizes ranging from fine pores to several tens of m Pores are formed. The soundproof panel according to the present embodiment exhibits good sound absorption characteristics over a low frequency band of 50 to 1,600 Hz and a high frequency band of 1,000 to 6,300 Hz.

2. Has good mechanical strength.

The sound insulation panel of the present embodiment exhibits a high mechanical strength against an external impact since the fiber material constituting the wood is compressed to form the skeleton of the material.

3. Because it contains many pores, it is very light in weight.

The soundproof panel for building according to the present embodiment exhibits a characteristic that it is much lighter than conventional synthetic wood or wood-wool boards because a large amount of stable air layer is formed between the wood pulverized materials.

4. Has flame retardancy.

The soundproof panel for construction according to the present embodiment can easily improve the flame retardancy by mixing the flame retardant material with the binder or by adsorbing the flame retardant material to the wood pulverized material.

5. The manufacturing cost is low.

Normally, wood chips such as sawdust are by-products that are produced during the processing of wood or wood, so the price is very low.

6. Provide insulation effect.

Wood crushed water has the original pores of wood. When the wood pulverized product is compression molded, a large number of pores are formed according to the compressive strength. These pores are very effective in reducing the thermal conductivity as well known. That is, the soundproof panel for building according to the present embodiment can additionally provide a thermal insulation effect to the building.

As a modification of the first embodiment, a mixture of wood pulverized material and a binder, that is, a molding material, may be further mixed with porous materials such as diatomaceous earth, zeolite, vermiculite and the like. In the case of forming a soundproof panel using wood pulverized material, it is necessary to increase the density by increasing the pressing force when molding the soundproof panel in order to reduce the size of the pores formed in the soundproof panel. However, when the density of the soundproof panel is increased as described above, the amount of pores in the interior of the soundproof panel is reduced. Therefore, it is very difficult to form minute pores in the soundproof panel, and as a result, there is a limit to enhance the soundproof effect on the sound wave in the low frequency band.

In the case of a porous material, that is, in the case of porous ceramics, fine pores of several tens to several hundreds of nanometers are formed in ceramic particles. Therefore, when such a porous material is mixed with a molding material, it is possible to further enhance the sound insulation effect for a low frequency band.

Particularly, according to the study of the present inventors, when pores having different sizes are formed in a certain material, the soundproofing function is improved. Fig. 3 is a view for explaining the soundproof function.

In FIG. 3, reference numeral 20 denotes a medium in which a plurality of pores are formed. The first pore 21 having a relatively large diameter and the second pore 22 having a small diameter are present in the medium. When the sound wave A is drawn from the outside, the sound wave A is separated from the medium 20 And propagated through the first and second pores 21 and 22. However, when the sound wave A having passed through the first pore 21 enters the second pore 22, the sound wave A is reflected or refracted as indicated by a and b. This phenomenon occurs similarly when the sound wave b passing through the second pore 22 enters the first pore 21. This is because the resonance frequency of the pore varies depending on the pore size.

As another modification of this embodiment, when the sound insulating panel is formed by mixing the wood pulverized material and the binder, the organic binder is preferably foamed to form a large amount of pores in the soundproof panel.

For example, when the wood pulverized product is mixed with an organic binder such as a urethane binder, water is preferably sprayed on the wood pulverized product by a spray method to adsorb moisture to the pulverized wood product. After adding the foaming agent to the organic binder, the wood pulverized material and the binder are mixed. In this case, when the mixture of the wood pulverized material and the binder is formed by hot rolling or hot extrusion, the water adsorbed on the wood pulverized material reacts with the foaming agent contained in the binder to generate air bubbles, Is effectively generated. That is, the soundproof performance of the soundproof panel is more effectively improved.

4 is a perspective view illustrating an outer shape of a soundproof panel according to a second embodiment of the present invention.

In the present embodiment, the soundproof panel 10 of the first embodiment, that is, the second member 20 is coupled to one side of the first member 10. At this time, the first member 10 and the second member 20 are formed to have different pore sizes or have different densities. When the panel is formed by mixing the wood pulverized material and the binder, the density of the panel varies depending on the kind of the binder. Even when the same binder is used, the density of the panel varies depending on the amount of the wood pulverized material and the binder mixture. In addition, the density of the panel varies depending on whether the wood formed with the wood pulverized material is generally called the southward or the soft wood called the northwood.

In this embodiment, by setting the type of wood pulverized material, the type of binder, the compressive strength, or the like for forming the second member 20 different from that of the first member 10, the first member 10 and the second member 20 may have different sizes or densities. A method of setting the density of the first member 10 and the second member 20 to be different from each other by setting the amount of foaming of the first member 10 and the second member 30 to be different from each other may be preferably performed .

3, when the sizes of the pores provided in the first member 10 and the second member 20 are set differently, the sound waves passing through the first member 10 pass through the second member 20 Reflection and refraction in the course of the process, resulting in more sound absorption and sound insulation. That is, the overall soundproofing effect of the soundproof panel is enhanced.

It is also known that the laminated structure of materials having different densities increases the soundproof effect. For example, Korean Utility Model Registration No. 20-0379075 discloses that a laminated structure of materials having different densities disperses vibrations and noises to improve sound insulation and sound absorption functions.

In the case of manufacturing the soundproof panel according to the present embodiment, the first material layer is laminated with the mixture for the first member 10, that is, the mixture of the wood crushed material and the binder, and the mixture for the second member 20 1 material layer on the upper or lower layer. The composite layers are rolled or extruded as a whole to complete a soundproof panel.

As a first modification of the present embodiment, the first mixture for forming the first member 10 and the second mixture for forming the second member 20 are entirely mixed to form a third mixture, A method of forming a soundproof panel by rolling or extrusion molding can be preferably carried out.

Further, it is also possible to preferably replace the second member 20 with a plate member having a different structure as a second modification of the present embodiment. As the panel for the second member 20, for example, polystyrene foam foam, polyurethane foam foam, polyurea foam foam, polyvinyl chloride foam foam, polypropylene foam foam, polyethylene foam foam, polystyrene foam foam, polyvinyl acetate foam foam , A melamine resin foam, a phenol resin foam, and other organic materials may be preferably employed.

When an organic foam panel is employed as the second member 20, when a soundproof panel is formed, a mixture for the first member 10 is first laminated, and a second member foamed or molded on the upper side or the lower side of the mixture 20 are disposed on the upper surface of the base plate 10, and then they are pressed as a whole to form a soundproof panel. In this case, a binder for forming the first member 10 acts as a binder for coupling the first member 10 and the second member 20.

As another method for forming the soundproof panel, a method may be adopted in which the first member 10 and the second member 20 are respectively formed and then bonded by using an adhesive.

In the first embodiment, the soundproof panel 10 is constituted by a single member. In this case, when the density of the soundproof panel 10 is increased to reduce the size of the pores as described above, the soundproof property against the low frequency band is improved, but the number and the size of the pores are reduced, If the density of the sound insulation layer 10 is lowered, the overall soundproofing property is improved, but the soundproofing property for the low frequency band is lowered. In this embodiment, since the density of the first member 10 is increased to improve the soundproofing property against the high frequency band and the overall soundproofing property can be maintained by the second member 20, it is possible to provide a more effective soundproofing property.

Also in this embodiment, it is also preferable to form pores of various sizes by mixing porous ceramics on the first member or the second member 10, 20 or on both the first member 10 and the second member 20 can do.

FIG. 5 is a perspective view showing an outer shape of a soundproof panel for a building according to a third embodiment of the present invention, FIG. 6 is an exploded perspective view of FIG. 5, and FIG. 7 is a sectional view taken along line A-A 'of FIG.

In this embodiment, the soundproof panel is configured to include the laminated structure of the first, third, and fourth members 10, 40, and 50. Here, the first and fourth members 10 and 50 are in the form of a square or a rectangular plate, and are made of a mixture of wood pulverized material and a binder. The first member 10 and the third member 50 may be composed of the same mixture and the fourth member 50 may be composed of the same mixture as the second member 20 of the second embodiment.

The third member 40 is formed in the shape of a square or a rectangular plate like the first and fourth members 10 and 50, and at least one through hole 41 is preferably provided. As shown in Fig. 7, the first and fourth members 10, 50 communicate with each other through this through-hole 41. As shown in Fig. The through hole 41 is for stably fixing the third member 40 between the first and fourth members 10, 50. The through hole 41 is not essential but is optionally provided.

The third member 40 may be formed of a material such as polystyrene foam foam, polyurethane foam foam, polyurea foam foam, polyvinyl chloride foam foam, polypropylene foam foam, polyethylene foam foam, polystyrene foam foam, polyvinyl acetate foam foam, melamine resin A foamed foam, a foamed foam of phenol resin, or other organic material is foamed and molded.

In the case of forming the soundproof panel of this embodiment, first, a mixture of the wood pulverized material and the binder is laminated to form a one-layer material layer for the fourth member 50, and the third member 40 is disposed thereon. Then, a mixture of the wood pulverized material and the binder is laminated on the upper side of the third insertion member 40 to form a two-layer material layer, thereby disposing the third member 40 between the mixture of the wood pulverized material and the binder. Then, the binder is cured while a pressure equal to or greater than a certain level is applied to the laminate, thereby forming a soundproof panel.

In the above-described manufacturing process, the upper and lower side mixture of the third member 40 are communicated and cured through the through hole 41 of the third member 40 in the course of applying pressure to the mixture of the wood pulverized product and the binder, The third member 40 is stably seated between the first and fourth members 10, 50 as shown in Fig.

In the soundproof panel according to the present embodiment, there is a difference in density and pore size between the first member 10 and the third member 40, and there is a difference between the third member 40 and the fourth member 50 There is a difference in density and pore size. Therefore, the excellent soundproofing property is exhibited by the synergism due to the difference in density and pore size.

In addition, the third member 40 inserted between the first member 10 and the fourth member 50 is made of an organic foam, so that the overall structure is very light.

Further, since the sound insulation panel exhibits highly effective heat insulation characteristics due to a large amount of pores present in each member, it is possible to expect double effects of sound insulation and heat insulation by installing the soundproof panel.

The embodiments according to the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the scope of the present invention.

For example, in the above-described embodiment, the outer surface of the first member 10, the second member 30, and the fourth member 50 can be preferably formed with patterns of unevenness and the like. This pattern increases the sound insulation efficiency by widening the contact area of the soundproof panel with respect to sound waves and scattering sound waves on the contact surface.

10, 30, 40, 50: first to fourth members, 41: through-hole.

Claims

And has a rectangular or square plate shape,
A laminated structure of a first member and a second member,
Wherein the first member comprises a first mixture comprising a first wood pulverizer and a first binder,
The second member having a different density than the first member,
Wherein the first mixture is set in an amount of 650 g to 1 kg when the size of the plate is 300 mm x 300 mm x 10 mm.

The method according to claim 1,
Wherein the first binder is a water-soluble organic binder.

3. The method according to claim 1 or 2,
Wherein the first binder is mixed with a flame retardant.

The method according to claim 1,
Wherein the first mixture further comprises a porous ceramic.

The method according to claim 1,
Characterized in that the second member comprises a second mixture comprising a second wood pulverizer and a first binder, wherein the first wood pulverizer and the second wood pulverizer are obtained from woods having different tissue densities Soundproof panels for construction.

The method according to claim 1,
Wherein the second member is composed of a third mixture comprising a first wood pulverizer and a second binder, wherein the first binder and the second binder are different.

The method according to claim 1,
Characterized in that the second member is constituted by a first mixture comprising a first wood pulverizer and a first binder and the second member is set to an amount of mixture having the same volume as the first member and of a different weight. Soundproof panel.

The method according to claim 1,
Wherein the second member comprises an organic foam.

6. The method of claim 5,
And a porous ceramic is further mixed in the second mixture.

The method according to claim 6,
And a porous ceramic is further mixed in the third mixture.

And has a rectangular or square plate shape,
A laminated structure of a first member and a second member,
Wherein the first member is composed of a mixture comprising a wood pulverizer and a binder,
The second member is composed of a foam layer,
Wherein the binder is a water-soluble organic binder.

12. The method of claim 11,
Wherein the binder is mixed with a flame retardant.

12. The method of claim 11,
Wherein the mixture further comprises a porous ceramic.

Preparing a wood pulverized product,
Mixing the wood pulverized material and the binder to form a mixture,
And forming the square or rectangular plate by rolling or pressing the mixture,
Wherein in the molding step, the mixture is set in an amount of 650 g to 1 kg when the size of the plate is 300 mm x 300 mm x 10 mm.

15. The method of claim 14,
Further comprising the step of adsorbing the flame retardant to the wood pulverized product before the step of forming the mixture.

15. The method of claim 14,
And mixing the binder with a flame retardant. &Lt; RTI ID = 0.0 > 11. < / RTI >

15. The method of claim 14,
Further comprising the step of adding a porous ceramic when mixing the wood pulverized material and the binder.