JP2001113511A - Building board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof and moisture permeable building board. SOLUTION: This building board is composed of a wood fiber board as a base 1 and a waterproof and moisture permeable sheet bonded to the surface of the base 1, at least to which an adhesive 2 is partially applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building board using a wood fiber board as a substrate.

[0002]

2. Description of the Related Art In recent years, a sheet having a moisture-proof and air-tightness property has been attached to the entire outside of a wall panel constituting a room to suppress the movement of indoor air and moisture behind the wall and under the floor. High-insulation construction methods have been provided, and the airtightness in houses has been increasing. By increasing the air density in the house, the heating efficiency is improved, and the running cost for heating can be reduced.

[0003] However, if the ventilation is not properly performed in a highly airtight indoor space, an environment in which various germs and outsourcing are liable to be propagated is provided.

[0004] Further, once moisture has entered into an airtight space such as the back of a wall or an attic space from a joint portion of constituent members or the like, there is no way for the moisture to escape, so there is a slight cut in the moisture-proof sheet or a nail for fixing the member. Moisture is concentrated and absorbed in the struck portion, causing corrosion.

[0005] In order to solve such problems,
Instead of a moisture-proof sheet that merely blocks the movement of water and water vapor, a waterproof / moisture-permeable sheet that blocks water but allows water vapor (moisture) to permeate has been used. By using such a waterproof / moisture permeable sheet stretched on a wall or the like at the construction site, even if moisture enters the sealed space, it gradually passes through the sheet in the form of water vapor and is released to the outside. , Corrosion hardly occurs.

[0006]

However, since such a sheet is prepared as a long sheet,
There was a problem that the work of sticking to a wall or the like at the construction site was troublesome.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention solves the above-mentioned problems in the prior art, and provides a building board that can be cut and has waterproof and moisture-permeable properties like conventional building boards. The purpose is to do.

[0008] By the way, in order to provide a building board having waterproof and moisture permeable performance, a waterproof and moisture permeable sheet may be attached to the surface of a wooden substrate in place of a conventional moisture proof sheet. Is required to have excellent moisture permeability. Due to the structure of the plywood, there is a continuous layer of adhesive between the veneers, and this adhesive layer suppresses the transmission of water vapor, so that the moisture permeability is very low. On the other hand, the wood fiber board is fixed only by the adhesive as a binder only at the contact point where the defibrated wood fibers overlap with each other, and there is no continuous layer or film of the adhesive, Since a fine space is continuous between the contact points where the fibers overlap each other, a passage for water vapor is secured, and good moisture permeability is provided. Therefore, a wood fiber board is used as the substrate of the building board according to the present invention.

Next, even if a wood fiber board excellent in moisture permeability is used as the substrate, the adhesive for attaching the waterproof / moisture permeable sheet forms a continuous adhesive layer at these interfaces. As a result, the adhesive layer blocks the moisture permeability of the wood fiber board. Therefore, a waterproof / moisture permeable sheet is adhered in a state where the adhesive is partially applied, and a portion where the adhesive is not applied is secured as a passage for water vapor.

Therefore, the architectural board according to the present invention is characterized in that a wood fiber board is used as a substrate, and at least a surface of the board is partially coated with an adhesive and a waterproof / moisture permeable sheet is attached. .

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A wood fiber board used as a substrate is
For example, wood fibers obtained by defibrating wood chips obtained by cutting softwood such as pine, cedar, cypress or hardwood such as lauan, kapole, chestnut and poplar or waste wood by a conventional method are compression-formed by a dry method. The specific gravity is preferably in the range of 0.35 to 1.15. If the specific gravity of the wood fiber board exceeds 1.15, the moisture permeability will rapidly decrease, while if the specific gravity is less than 0.35, sufficient strength as a building board cannot be obtained.

The adhesive used for attaching the waterproof / moisture permeable sheet to at least the surface of the wood fiber board is a commonly used urea resin, phenol resin, melamine resin, vinyl acetate resin, vinyl urethane, or the like. An adhesive such as a resin-based adhesive can be used.

It is preferable that the application area of the adhesive is 1 to 60% with respect to the substrate surface area. The application area close to the lower limit value is a minimum value required for securing the integrity of the panel in a temporarily fixed state in which the waterproof / moisture permeable sheet is barely attached to the substrate surface. In the case of such an application area, the temporarily fixed waterproof / moisture permeable sheet is fixed to the substrate by staples or the like at the construction site.

Here, the application of the adhesive is performed so as not to form a continuous adhesive layer over the entire surface of the substrate. Specifically, the adhesive is applied in the form of dots (FIG. 1) and parallel lines (FIG. 2). ) Or in a grid pattern (FIG. 3). In these figures, reference numeral 1 indicates a substrate made of a wood fiber board, and reference numeral 2 indicates a portion (hatched portion) where an adhesive is applied.

The waterproof / moisture permeable sheet is adhered to at least the surface of the substrate via the adhesive partially applied as described above. Further, the sheet can be adhered to the back surface of the substrate or the edge of the wood as needed. For example, the front and back sides of the board, the front and back sides of the board, plus two opposing sides, a total of 4
The sheet may be attached to the surface or the entire surface (three surfaces) of the substrate. When sticking the sheet to the front edge, it is possible to apply an adhesive partially to the front edge in the same manner as when attaching to the front and back surfaces, but as a use for building boards, high moisture permeability and When adhesive strength between the board and the waterproof / breathable sheet is required, apply an adhesive to the entire surface of the kiguchi to increase the adhesive strength between the board and the waterproof / breathable sheet by the adhesive strength of the kiguchi part. Is preferred.

When a waterproof / moisture permeable sheet is adhered to the surface of the substrate, a waterproof / moisture permeable sheet having the same dimensions as the substrate is usually used. It is preferable to use a waterproof / breathable sheet having a large size and stick the two sides of the substrate so that the waterproof / breathable sheet protrudes. When used as a wall base material, it is nailed and fixed at an appropriate interval at the joint between building boards assuming shrinkage and expansion of the board, so it protrudes from the side of the board of the waterproof / moisture permeable sheet By fixing the portion to the adjacent building plate surface with a tucker or the like, the waterproof / moisture permeable sheet can be made continuous on the finished base surface.

A waterproof / moisture permeable sheet is a sheet having a property of preventing the transmission of water in a liquid state but transmitting water vapor in a gas state, and various types of sheets using polyester fibers or the like as basic fibers are commercially available. For example, Victoron (trade name, Asahi Kasei), Outall (trade name, Mitsubishi Plastics Chemical)
In the present invention, these can be arbitrarily selected and used.

In order to demonstrate the moisture permeability of the architectural board according to the present invention, a wood fiber board having a specific gravity of 0.76 was used as a substrate, and an adhesive was applied to the surface of the board with a coating area of 13% of the substrate surface area. After applying in the form of a dot as in the above, a waterproof / moisture permeable sheet is attached to produce a moisture permeation resistance value (the reciprocal of the moisture permeability coefficient, so that the larger the value, the more difficult it is for water vapor to pass. where is was measured ^{m 2 · h · mmHg / g} ),
1.14. The moisture permeability resistance of the wood fiber board having a specific gravity of 0.76 used as the base material is 1.04, and it is understood that the excellent moisture permeability performance of the wood fiber board is hardly hindered by the configuration of the present invention. . The waterproof / moisture permeable sheet used had a moisture permeability resistance of 0.27.

The moisture permeability of a commercially available plywood was measured to be 17.24, confirming that the moisture permeability was extremely poor.

As a comparative example with respect to the present invention, a wood fiber board having a specific gravity of 0.76 was applied to the entire surface of the substrate with an adhesive, and a waterproof / moisture permeable sheet was affixed. The resistance was 11.82, demonstrating that the adhesive layer applied over the entire surface significantly impaired the moisture permeability.

[0021]

According to the present invention, a wood fiber board excellent in moisture permeability is used as a substrate, and an adhesive is partially applied when a waterproof / moisture permeable sheet is attached to at least the surface thereof. It is provided as an architectural board that does not impair the wood fiber board's moisture-permeable sheet, so simply installing this architectural board on the wall base material creates a wall with excellent waterproof and moisture-permeable performance Is done.

The architectural plate of the present invention can be used as it is as a plate for architectural and furniture use, or can be used as an architectural panel in a state where a frame member is assembled around its four-way entrance. It can be used for a wide range of applications.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example in which an adhesive is applied in a dot form on a substrate surface in a building board of the present invention.

FIG. 2 is an explanatory view showing an example in which an adhesive is applied in parallel lines on a substrate surface in the building board of the present invention.

FIG. 3 is an explanatory view showing an example in which an adhesive is applied in a grid pattern on a substrate surface in the building board of the present invention.

[Explanation of symbols]

 1 Board (wood fiber board) 2 Adhesive applied part

Continued on the front page F-term (reference) 2B260 AA03 AA20 BA01 BA05 BA19 CB01 CB04 CD02 CD04 CD06 CD22 EB11 EB13 EB19 EB21 2E110 AA14 AA15 BA02 BA12 GA32W GA33X GA42W GB52W GB62X 2E162 CC08 CE09 4F100 AK01B33B02 AK01B33A02 BAK BA13 BA32 CB01 DG06 DG13 GB08 GB81 JA13A JD04B JD05B JL01 YY00A

Claims (3)

[Claims] 1. An architectural board comprising a wood fiber board as a substrate and a waterproof / moisture permeable sheet adhered to at least the surface of at least a surface thereof. 2. The wood fiberboard has a specific gravity of 0.35 to 1.15.
The architectural plate according to claim 1, wherein: 3. The architectural board according to claim 1, wherein the adhesive application area is 1 to 60% of the substrate surface area.