JP2021014020A - Fireproof natural wood interior building material - Google Patents

Abstract

To provide a fireproof natural wood interior building material in which a low-added-value wood is used for effectively utilizing forest resources and fireproof performance and beauty are satisfied, and a manufacturing method thereof.SOLUTION: This material comprises: a base material 1 using a low-added-value wood; a fireproof sheet 2 comprising inorganic paper sheets 4 stuck on a surface of the base material 1; and a natural wood decorative sheet 3 stuck on a surface of the fireproof sheet 2. The fireproof sheet 2 is provided by adhering the plurality of layers of inorganic paper sheets 4 with flame-retardant adhesive. Since the inorganic paper sheets 4 constituting the fireproof sheet 2 fill the irregularities made of knots and black stripes which the base material 1 has, and smooth the surface of the base material 1, the material in this invention can be utilized as an interior building material even when the low-added-value wood is used for the base material 1. Further, since the fireproof performance is imparted by the flame retardancy of the inorganic paper sheets 4, an impregnation process of flame-retardant agent to the base material 1 can be omitted, and production cost can be reduced.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fireproof natural wood interior building material. More specifically, it relates to a fire-prevention natural wood interior building material that is beautiful and can exhibit fire-prevention performance even if low-value-added wood with knots, black streaks, discoloration, etc. is used.

Natural wood is used as the material for interior building materials, but most of the natural wood is obtained from domestic and foreign forest resources. Natural wood obtained from forest resources includes high-value-added wood that has a fine structure and a beautiful finish after processing, while it has a rough structure and many irregularities, knots, black streaks, and discoloration, making it aesthetically pleasing. There is a lack of low value-added wood.
High-value-added wood is used as a surface decorative material after being processed into a single plate and further processed into a thin plate. Low value-added wood has not been fully utilized because there is little demand for building materials that require aesthetics.

By the way, there are the following conventional techniques for wood-based materials that give fireproof performance to interior building materials.
Patent Document 1 is a non-combustible wood-based material in which a radiant heat-reflective heat-insulating sheet in which a metal foil layer and a heat-insulating layer are laminated is formed on one surface of a wood-based base material. The non-combustible performance is imparted by a method of impregnating the base material with a flame retardant.

Patent Document 2 is a decorative non-combustible material, in which a non-combustible sheet made of a laminated body of an aluminum foil and a fibrous sheet is inserted between a base material and a decorative single plate and integrated. In addition to using a non-combustible sheet, the base material is impregnated with a flame retardant to impart non-combustible performance.

In many conventional techniques including the above-mentioned Patent Documents 1 and 2, impregnating a base material with a flame retardant is a typical method for obtaining a non-combustible wood-based material.
However, in order to impregnate the base material with a chemical, an impregnation kiln for impregnating the base material in a pressurized state is required, the equipment cost is high, and the base material having a wide width is significantly inferior in processing ability. As a result, there is a problem that the price of interior building materials also increases.
Even if you try to use low-value-added wood, it has many drawbacks such as knots (living knots and dead knots), unevenness, black streaks, discoloration, cracks, peeling and chipping, so it should be used for interior building materials that require beauty. Can't. Therefore, it was considered to use it only for the base material without using it as a surface decorative material, but even if the base material is impregnated with a flame retardant, the impregnated state becomes uneven in wood having knots scattered and coarse and dense. , I couldn't expect stable quality.

For the above reasons, low-value-added wood with defects such as knots and black streaks has not been effectively used. This means that forest resources are not fully utilized.

Japanese Unexamined Patent Publication No. 2018-140539 Japanese Patent No. 3965635

In view of the above circumstances, it is an object of the present invention to provide a fire-prevention natural wood interior building material using low-value-added wood and satisfying fire-prevention performance and beauty in order to effectively utilize forest resources, and a method for producing the same.

The fireproof natural wood interior building material of the first invention is a fireproof sheet made of a base material using low value-added wood, an inorganic paper attached to the surface of the base material, and a natural wood attached to the surface of the fireproof sheet. It is characterized by being composed of a decorative sheet.
The fireproof natural wood interior building material of the second invention is characterized in that, in the first invention, the fireproof sheet is obtained by adhering a plurality of layers of inorganic paper with a flame-retardant adhesive.
In the first or second invention of the fireproof natural wood interior building material of the third invention, the natural wood decorative sheet adheres a natural wood thin plate to inorganic paper and forms a surface coating film on the surface of the natural wood thin plate. It is characterized by being a product.
The method for producing a fireproof natural wood interior building material of the fourth invention includes a base material processing step of processing low value-added wood as a base material and a fireproof sheet sticking step of sticking a fireproof sheet made of inorganic paper on the surface of the base material. It is characterized by comprising a decorative sheet attaching step of attaching a natural wood decorative sheet to the surface of the fireproof sheet.
In the fourth invention, the method for producing a fireproof natural wood interior building material of the fifth invention is to form a laminated sheet by carrying out a step of adhering inorganic paper with a flame-retardant adhesive a plurality of times in the fireproof sheet attaching step. It is characterized by.
The method for producing a fireproof natural wood interior building material according to the sixth invention is the method of manufacturing the fireproof natural wood interior building material. In the fourth invention or the fifth invention, in the step of attaching the decorative sheet, a natural wood thin plate is adhered to an inorganic paper, and a surface coating film is applied to the surface of the natural wood thin plate. It is characterized in that it forms.

According to the first invention, the surface decorative surface is not affected by the unevenness of the base material of the inorganic paper constituting the fireproof sheet, and the interior building material is made of low-value-added wood as the base material. Can be used as. Further, since the flame retardancy of the inorganic paper can impart fireproof performance, the step of impregnating the base material with the flame retardant chemical can be omitted, and the product value can be reduced. The non-combustible wood-based material of the present invention has an advantage that leaching does not occur because it does not depend on the method of infiltrating the flame retardant agent into the wood surface.
According to the second invention, since the inorganic paper has a plurality of layers and the flame-retardant adhesive also has a plurality of layers, the fire prevention performance is improved.
According to the third invention, since the natural wood sheet is used, a beautiful appearance can be obtained, and the surface coating film can protect the natural wood sheet and impart fireproof performance.
The fireproof natural wood interior building material obtained by the manufacturing method of the fourth invention is low because the inorganic paper constituting the fireproof sheet fills the unevenness of the base material with knots and black streaks to smooth the surface of the base material. Even if value-added wood is used as the base material, it can be used as an interior building material. Further, since the flame retardancy of the inorganic paper can impart fireproof performance, the step of impregnating the base material with the flame retardant chemical can be omitted, and the product value can be reduced.
The fireproof natural wood interior building material obtained by the production method of the fifth invention has a plurality of layers of inorganic paper and also has a plurality of layers of flame-retardant adhesive, so that the fireproof performance is improved.
Since the fireproof natural wood interior building material obtained by the production method of the sixth invention uses a natural wood thin plate, a beautiful appearance can be obtained, and the surface coating film can protect the natural wood thin plate and impart fireproof performance.

It is sectional drawing which shows the basic structure of the fire protection natural wood interior building material which concerns on this invention. It is sectional drawing of the fire prevention natural wood interior building material which concerns on one Embodiment of this invention. It is explanatory drawing of the log processing step I which obtains a base material and a natural wood thin plate from a log. It is explanatory drawing of the pre-stage processing step II1 of a fire prevention sheet. It is explanatory drawing of the post-stage processing process II2 of a fire prevention sheet. It is explanatory drawing of the pre-stage processing step III1 of a decorative sheet. It is explanatory drawing of the middle-stage processing step III2 of a decorative sheet. It is explanatory drawing of the post-stage processing step III3 of a decorative sheet. It is explanatory drawing of the pre-stage manufacturing process IV1 of an interior building material A. It is explanatory drawing of the latter stage manufacturing process IV2 of an interior building material A. It is a test device for fire protection test. It is an experimental result of Example 1. It is an experimental result of Example 2.

Next, the basic configuration of the fireproof natural wood interior building material A according to the present invention will be described with reference to FIG.
The fireproof natural wood interior building material A according to the present invention is a fireproof sheet 2 made of a base material 1 using low value-added wood, an inorganic paper attached to the surface of the base material 1, and the surface of the fireproof sheet 2. It is characterized in that it is composed of a natural wood decorative sheet 3 (hereinafter, may be simply referred to as a decorative sheet 3) attached to.

According to the present invention, the inorganic paper constituting the fireproof sheet 2 is not affected by the unevenness of the base material 1 consisting of knots and black streaks, and even if low value-added wood is used for the base material 1. It can be used as an interior building material. Further, since the flame retardancy of the inorganic paper can impart fireproof performance, the step of impregnating the base material 1 with the flame retardant chemical can be omitted, and the product value can be reduced.

The details of the fireproof natural wood interior building material A according to the embodiment will be described with reference to FIG.
The base material 1 is made of low value-added wood and processed to a length, width and thickness having predetermined dimensions. The low-value-added wood referred to in the present specification is wood having a rough structure and many irregularities, or having defects such as knots, black streaks, and discoloration.
The fireproof sheet 2 attached to the surface of the base material 1 is a layered sheet in which a plurality of layers of inorganic paper 4 and an aluminum foil 5 are bonded with a flame-retardant adhesive 8.
The natural wood decorative sheet 3 attached to the surface of the fireproof sheet 2 is obtained by adhering a natural wood thin plate 6 to an inorganic paper 4 and forming a flame-retardant surface coating film 7 on the surface of the natural wood thin plate 6. is there.

In the embodiment shown in FIG. 2, four layers of the inorganic paper 4 are used. In addition, 4a to 4d are used as the reference numerals when the inorganic papers of each layer are individually indicated, and 4 is used as the reference numerals when the inorganic papers are comprehensively indicated. In the present invention, the inorganic paper 4 is not limited to four layers, and may be three or less layers or five or more layers. However, if the number of layers of the inorganic paper 4 is small, it is easily affected by the unevenness and streaks of the base material 1, and conversely, if the number of layers of the inorganic paper 4 is too large, the thickness of the building material becomes too thick. , Neither is preferable.

The inorganic paper 4 is made by using pulp mainly as an inorganic material such as aluminum hydroxide or magnesium silicate and impregnating it with a flame retardant. As the flame retardant, ammonium phosphate, ammonium sulfate, sodium borate, magnesium hydroxide, borax boric acid, organophosphorus, halogen, etc. are used.

Since the inorganic paper 4 contains pulp, when it is attached to the base material 1, the unevenness and knots on the surface of the base material 1 can be filled and smoothed. In addition, since it contains a flame retardant such as magnesium silicate, it can exhibit fire prevention performance.

The aluminum foil 5 constituting the fireproof sheet 2 is a piece of paper to which a thin piece of aluminum is attached. In the illustrated example, the thickness of the paper is 50 μm, the thickness of the aluminum flakes is 50 μm, and the thickness of the aluminum foil 5 is 100 μm. However, those thinner than this thickness and those hotter can be used in the present invention without any particular problem. The aluminum foil 5 is attached for the purpose of improving / imparting fire prevention performance.

The inorganic paper 4 constituting the natural wood decorative sheet 3 is the same as the inorganic paper 4 constituting the fireproof sheet 2. As the natural wood thin plate 6 constituting the natural wood decorative sheet 3, a wood selected from high value-added wood processed into a thin plate is used. The thickness of the natural wood sheet 6 can be exemplified as a thickness of 100 μm, but the thickness is not particularly limited.

As the surface coating film 7 constituting the natural wood decorative sheet 3, a coating film having flame retardancy is used. Examples of such a surface coating film 7 include, but are not limited to, an acrylic resin mixed with an inorganic phosphoric acid compound and an organic phosphorus flame retardant.
By using the surface coating film 7, it is possible to protect the surface of the natural wood decorative sheet 3 and impart flame retardancy.

According to the fireproof natural wood interior building material A of the above embodiment, since the inorganic paper 4 has a plurality of layers and the flame-retardant adhesive 8 also has a plurality of layers, the fireproof performance is improved. Further, since the natural wood thin plate 6 is used, a beautiful appearance can be obtained, and the surface coating film 7 can protect the natural wood thin plate 6 and impart fireproof performance.
In the embodiment shown in FIG. 2, the thickness of the base material 1 is 12 to 24 mm, the thickness of the fireproof sheet 2 is about 1 mm, and the thickness of the decorative sheet 3 is about 0.3 to 0.4 mm. The dimensions are not limited to this.

The technical principle of the fireproof natural wood interior building material A of the present embodiment will be described.
We examined the case of impregnating low-value-added wood with coarseness such as knots with a flame retardant.
(1) A flame retardant impregnation process is required to obtain fire protection performance. However, impregnation processing is not easy. In particular, wide size products such as plywood are extremely difficult. In addition, there are problems such as inferior cosmetic properties on the surface.
(2) There is a method of pasting a single plate to improve the cosmeticity of the surface. ・ However, the adhesiveness between the adhesive for pasting the single plate and the flame retardant is poor, which hinders its spread.
・ The compatibility between the surface paint and the flame retardant is poor, and a special and expensive paint will be used.
-If there is no coating film on the surface, the flame retardant will precipitate over time and the surface will turn white.

Therefore, it was considered to attach a fire prevention sheet using inorganic paper to low value-added wood.
If the fireproof sheet is about 1 mm thick, there are the following problems.
When a 1 mm thick inorganic paper is impregnated with a flame retardant, the flame retardant is higher than that of low-value-added wood. However, since the thickness is 1 mm, if the interlayer strength is high, impregnation unevenness is likely to occur, the processing efficiency is inferior, and the cost is high. In particular, wide-sized products such as plywood tend to be more difficult.

Therefore, in the present invention, the fire prevention sheet is composed of a plurality of layers. In this case, the inorganic paper of each layer is thin with a thickness of about 0.2 mm.
When the inorganic paper 0.2 mm thick is impregnated with the flame retardant, the interlayer strength is not inferior and the flame retardant is significantly higher than when the low value-added wood is impregnated with the flame retardant, and it is difficult to apply from one side. The effect of flammability is obtained, which leads to improvement of processing efficiency (processing with a wide size becomes easy). On the other hand, in the case of multiple layers, the amount of organic matter increases and the flame retardancy tends to be inferior. Therefore, an aluminum foil layer is provided to suppress deterioration of performance. For both flame-retardant paints and flame-retardant adhesives, the water resistance performance is improved by using an appropriate amount of organic resin as an effect of making it difficult for the flame retardant to elute over time.

The laminating process of the inorganic paper is preferably as follows.
Processing process of fireproof sheet (1) Coating flame-retardant paint on one side of inorganic paper (2) Applying flame-retardant adhesive to one side of inorganic paper coated with inorganic paint and processing inorganic Paper is laminated in two layers (3) A flame-retardant adhesive is applied to one side of the two-layer bonded sheet, and the two-layered sheet of the same processing is bonded in four layers.

(Manufacturing method of fireproof natural wood interior building material A)
A method for producing the fireproof natural wood interior building material A will be described with reference to FIGS. 3 to 10.
The method for producing the fireproof natural wood interior building material A according to the present invention includes a log processing step I for processing a decorative material and a base material from a log, a fireproof sheet processing step II for obtaining a fireproof sheet 2 made of inorganic paper 4, and a fireproof sheet processing step II. It comprises a decorative sheet processing step III for obtaining a natural wood decorative sheet 3, and a manufacturing process IV for an interior building material A in which a fireproof sheet 2 and a decorative sheet 3 are attached to a base material 1.

(Log processing process I)
The log processing step I will be described with reference to FIG.
The log T is cut into a plate shape to form a long square single plate. If the log T is a high value-added wood without knots or streaks, it is considered as a single plate 9 for decorative materials. If the log T is a low value-added wood with knots and streaks, it is used as the base material 1 in the present invention.
In addition, low value-added wood is often found in trees such as cedar and larch. The present invention is used as the base material 1 in order to increase the utility value of these low value-added woods.
The single plate 9 obtained from high value-added wood is boiled to be appropriately softened, and then sliced to obtain the natural wood thin plate 6 used in the present invention. Since the natural wood sheet 6 has a beautiful appearance, it is suitable as a decorative material.

(Fire protection sheet processing process II)
The fire prevention sheet processing step II includes a pre-stage processing step II1 shown in FIG. 4 and a post-stage processing step II2 shown in FIG. 5, and is executed in order.

The first-stage manufacturing process II1 of the fireproof sheet will be described with reference to FIG.
The inorganic paper 4 itself is a known paper product, and is subjected to a processing process using a roll 4r that is wound up for easy handling.
The flame-retardant adhesive 8 is applied to the inorganic paper 4 that moves between the roll 4r on the unwinding side and the roll 4r1 on the winding side. A known coater 11 is used for coating. The coater 11 includes rolls 11a and 11b arranged horizontally facing each other and rolls 11c that support the rolls 11b with the inorganic paper 4 interposed therebetween. The liquid adhesive 8 flows from between the pair of rolls 11a and 11b onto the upper surface of the inorganic paper 4 and is applied.

Two sheets of inorganic paper are used by using the roll 4r1 obtained by winding the inorganic paper 4 with the adhesive obtained as described above and the roll 4r by winding the inorganic paper 4 without the adhesive. 4 and 4 are joined using the adhesive 8. A known laminating roller 12 may be used for joining. The bonding roller 12 is provided with a pair of rollers 12a and 12b, and the bonding can be performed by passing the inorganic paper 4 while applying pressure between the rollers 12a and 12b.
As a result, an intermediate product, a two-layer fireproof sheet, is completed. The roll of this fireproof sheet two-layer product is indicated by reference numeral 21r.

The latter-stage manufacturing process II2 of the fireproof sheet will be described with reference to FIG.
Two rolls 21r of the fireproof sheet two-layer product are used, and the fireproof sheet two-layer products are bonded to each other. Another coating device 11 having the same function as the coating device 11 shown in FIG. 4 may be used for applying the adhesive 8, and another coating device 11 having the same function as the bonding roller shown in FIG. 4 may be used for bonding. The bonding roller 12 may be used.

After the bonding is completed, the fireproof sheet 4-layer product is prepared, and further crimped with the press 13. The press 13 has press plates 13a and 13b arranged vertically facing each other. When heat is applied and pressure is applied by sandwiching the press plates 13a and 13b, a fireproof sheet 4-layer product is completed. Further, when the cutter 14 is used to cut the product to a convenient length, the fireproof sheet 4-layer product 22 is completed.

(Cosmetic sheet processing process III)
The decorative sheet processing step III includes a pre-stage processing step III1 shown in FIG. 6, a middle-stage processing step III2 shown in FIG. 7, and a post-stage processing step III3 shown in FIG. 8, and is executed in this order.

The first-stage manufacturing process III1 of the decorative sheet will be described with reference to FIG.
In the first-stage manufacturing step III1 of the decorative sheet, the natural wood thin plate 6 obtained in the log processing step I (FIG. 3) and the inorganic paper 4 are bonded together. First, the adhesive 8 is applied to the inorganic paper 4. As the coater, another coater 11 having the same function as the coater 11 may be used.
A natural wood thin plate 6 is placed on the inorganic paper 4 coated with the adhesive 8, and then pressed by a press 13. As the press 13, another press having the same function as the press 13 shown in FIG. 5 may be used.
In this process, a single plate-like intermediate product of the natural wood sheet 13 is completed.

The middle manufacturing process III2 of the decorative sheet will be described with reference to FIG. 7.
The single plate-shaped natural wood decorative sheet 3 is finished into a continuous sheet by the joining device 14. As the joining device 14, a known device for joining sheets to each other with a finger joint machine, a butt joint machine, or the like may be used. When a continuous natural wood decorative sheet 3 is obtained, the decorative sheet 3 is fed by a feed roller 15 and wound into a roll by a winder (not shown) to obtain a roll intermediate product 3r of the decorative sheet 3.

The latter-stage manufacturing process III3 of the decorative sheet will be described with reference to FIG.
While unwinding the roll intermediate product 3r of the decorative sheet 3, the roll intermediate product 3r1 is wound up, and the running decorative sheet 3 is polished by the polishing roll 16.
The polishing roll 16 is provided with a grindstone on the outer circumference of the roll, and when polished with the grindstone, a thin plate much thinner than that for cutting can be obtained.

The roll intermediate product 3r1 is unwound in the next step and wound up on the roll intermediate product 3r2. The paint is applied to the surface of the running decorative sheet 3 by the coating device 17, and the surface coating film 7 is formed.
When the decorative sheet 3 with the coating film 7 is wound up, it becomes a decorative sheet roll 3R.

(Manufacturing process IV of interior building material A)
The manufacturing process IV of the interior building material A includes a first-stage manufacturing process IV1 shown in FIG. 9 and a second-stage manufacturing process IV2 shown in FIG. 10, and is executed in order.

The first-stage manufacturing process IV1 of the interior building material A will be described with reference to FIG.
The adhesive 8 is applied to the upper surface of the fireproof sheet 4-layer product 22 with the applicator 11. The decorative sheet 3 unwound from the decorative sheet roll 3R is attached to this. A bonding roller 12 and a press 13 are used for bonding. When the cutter 14 cuts to a predetermined length after the bonding is completed, a laminated sheet of the fireproof sheet 2 and the decorative sheet 3 is completed.

The latter-stage manufacturing process IV2 of the interior building material A will be described with reference to FIG.
A laminated product of the fireproof sheet 2 and the decorative sheet 3 is joined to the upper surface of the base material 1 obtained in the log processing step I. For joining, the adhesive 8 is applied to the upper surface of the base material 1 with the coating device 11, the laminated product is placed, and heat and pressure are applied with the press 13 for crimping.

By executing each of the above steps I to IV, the interior building material A of the present invention can be obtained. This interior building material has a structure in which a fireproof sheet 2 is attached to the surface of the base material 1 shown in FIG. 2 and a decorative sheet 3 is attached to the surface of the fireproof sheet 2.

Examples 1 and 2 were prepared with the configuration shown in FIG.
The inorganic paper constituting the fireproof sheet is a mixture of pulp and aluminum hydroxide, and the details are as follows.
Thickness 0.2 mm (tolerance ± 0.05 mm)
Weight 170 g / m ² (tolerance ± 17 g / m ² )
Composition Aluminum hydroxide 74.5 ± 2%
Pulp 16 ± 2%
Glass fiber 1.5 ± 1.5%
Acrylic resin 5 ± 1.5%
Polyvinyl alcohol-based resin 3 ± 1.5%

(Example 1)
The base material 1 is a cedar material having a thickness of 40 to 30 mm.
The fire prevention sheet 2 has a thickness of 1050 μm, and the specific configuration is as follows.
The inorganic paper 4 is composed of four layers of inorganic paper 4a, 4b, 4c, and 4d, each layer is about 200 μm, the flame-retardant adhesive 8 is about 30 μm, and the aluminum foil 5 is a two-layer laminate of 50 μm. , And is about 100 μm.
The natural wood decorative sheet 3 has a thickness of about 380 μm, and the specific configuration is as follows.
The natural wood single plate 6 is about 100 μm, and the surface coating layer is about 50 μm. The flame-retardant adhesive layer 8 is about 30 μm.

(Example 2)
Compared with Example 1, the amount of the flame retardant added to the flame-retardant paint applied to the inorganic paper was reduced from 30% to 10%, and the thickness of the aluminum foil 5 was reduced from 100 to 50.

(experimental method)
The fire prevention performance test was carried out at the Aichi Industrial Science and Technology Research Center based on the fire prevention performance test / evaluation work method of the Japan Building Research Institute, using the test equipment shown in FIG.
The test piece (Examples 1 and 2) is placed in the test piece holder and heated with a radiant electric heater for a predetermined time. Then, the total calorific value after heating, the presence or absence of cracks and emptiness, and the heat generation rate are confirmed.

(result)
The experimental results for Example 1 are shown in FIG.
The heat generation rate was 2.08 kW / m ² , and the total heat generation amount was 7.29 MJ / m ² . No cracks or holes were formed that penetrated to the back surface, which is harmful for fire prevention.
As a result of the heating test, if the following criteria are satisfied, the test piece is passed (heat generation test conforming to ISO5660-1).
(1) The total calorific value for 20 minutes after the start of heating is 8 MJ / m ² or less (2) There are no cracks or holes that penetrate to the back surface, which is harmful for fire prevention, for 20 minutes after the start of heating (3) Start of heating The heat generation rate should not exceed 200 kW / m ² continuously for 10 seconds or more for the next 20 minutes.

Since the results of the heating test were as described above, Experimental Example 1 was based on the provisions of Article 68-25, Paragraph 1 of the Building Standards Act (including the case where it is applied mutatis mutandis in Article 88, Paragraph 2 of the same Act). , It was recognized that it conforms to the provisions of Article 2-9 of the same law and Article 108-2 1 to 3 of the construction order of the same law (non-combustible materials).

The experimental results for Example 2 are shown in FIG.
The heat generation rate was 2.41 kW / m ² , and the total heat generation amount was 5.90 MJ / m ² . No cracks or holes were formed that penetrated to the back surface, which is harmful for fire prevention.
As a result of the heating test, if the following criteria are satisfied, the test piece is passed (heat generation test conforming to ISO5660-1).
(1) The total calorific value for 10 minutes after the start of heating is 8 MJ / m ² or less (2) There are no cracks or holes that penetrate to the back surface, which is harmful for fire prevention, for 10 minutes after the start of heating (3) Start of heating The heat generation rate should not exceed 200 kW / m ² continuously for 10 seconds or more for the next 10 minutes.

Since the results of the heating test were as described above, Example 2 is stipulated in Article 68-26, Paragraph 1 of the Building Standards Act (including the case where it is applied mutatis mutandis in Article 88, Paragraph 1 of the same Act). Based on this, it was recognized that the law conforms to the provisions of Article 1, Item 5 and Article 108-2, Paragraphs 1 to 3 (quasi-incombustible materials) of the Construction Ordinance.

The fireproof natural wood interior building material A of the present invention is used as a cover material, a ceiling material, a decorative material such as a louver, a fitting, and a decorative material for a partition.

1 Base material 2 Fireproof sheet 3 Natural wood decorative sheet 4 Inorganic paper 5 Aluminum foil 6 Natural wood thin plate 7 Surface coating A Fireproof natural wood Interior building material I Log processing process
II Fire protection sheet processing process
III Decorative sheet processing process

Claims (6)

Base material using low value-added wood and
A fireproof sheet made of inorganic paper attached to the surface of the base material, and
A fireproof natural wood interior building material, which comprises a natural wood decorative sheet attached to the surface of the fireproof sheet. The fireproof natural wood interior building material according to claim 1, wherein the fireproof sheet is obtained by adhering a plurality of layers of inorganic paper with a flame-retardant adhesive. The fireproof natural wood interior according to claim 1 or 2, wherein the natural wood decorative sheet is obtained by adhering a natural wood thin plate to an inorganic paper and forming a surface coating film on the surface of the natural wood thin plate. Building materials. The base material processing process for processing low value-added wood as a base material,
A process of attaching a fireproof sheet made of inorganic paper to the surface of the base material, and a process of attaching the fireproof sheet.
A method for producing a fireproof natural wood interior building material, which comprises a decorative sheet pasting step of sticking a natural wood decorative sheet on the surface of the fireproof sheet. The method for producing a fireproof natural wood interior building material according to claim 4, wherein the fireproof sheet sticking step is formed into a laminated sheet by performing a step of adhering inorganic paper with a flame-retardant adhesive a plurality of times. The fireproof natural wood interior according to claim 4 or 5, wherein the decorative sheet attaching step is for adhering a natural wood thin plate to an inorganic paper and forming a surface coating film on the surface of the natural wood thin plate. Manufacturing method of building materials.