JPH0337307Y2 - - Google Patents

Description

[Detailed Description of the Invention] The purpose of the present invention is to solve the drawbacks of gypsum board, which is currently widely used for construction purposes.

Gypsum board is used as a base material for construction because it is cheap compared to other materials and is relatively easy to construct, but it has low bending strength and impact strength, so it is not suitable for walls such as walkways, stairs, children's rooms, etc. It cannot be used as a material, and decorative paper or cloth attached to the surface may peel off due to indoor condensation. Furthermore, when the decorative paper or cloth is replaced, not only the decorative paper and cloth but also the cardboard on the surface of the gypsum board is peeled off, and the gypsum board itself has to be replaced. It also has the disadvantage of poor heat insulation and sound absorption properties.

The present invention aims to solve these problems of conventional gypsum board. That is, as described below, in the present invention, natural wood thin plates 4, 4 are adhesively laminated on the front and back surfaces of a gypsum board P, and holes 4a, 4 are formed that do not penetrate through the gypsum board P or do not penetrate through the gypsum board P.
By providing b and 4c, it is possible to obtain a construction board material that has high strength, does not allow the decorative paper to peel off, and has good heat insulation and sound absorption properties.

Embodiments of the present invention illustrated in the drawings will be described below.

(Explanation of Examples) The gypsum board is made of arbitrarily colored gypsum or gypsum mixed with fibrous materials as necessary to strengthen the gypsum as the core layer 1, and the core layer 1 and its entire surface are covered with longitudinal strips. A piece of cardboard 2 that covers the wood end in the direction and is rolled up to a part of the back side, and a cardboard 3 that covers the entire back side including the front cardboard 2 part that is rolled up to a part of the back side. be. Gypsum can be colored arbitrarily by mixing pigments, dyes, etc. The cardboard used for the front and back sides is mainly made of waste paper, and must have an appropriate amount of water absorption, and it is more preferable to use paper with improved water resistance. Having an appropriate amount of water absorption improves the permeability of adhesive when applied, and improves the peel strength of the cardboard itself.

It is preferable that the cardboard 2 and 3 have a thickness of 0.2 to 0.5 mm.
If it is outside this range, a large amount of water in the adhesive will penetrate into the gypsum core layer 1, reducing the strength of the gypsum board P itself, or the adhesive will not penetrate sufficiently, causing the cardboard 2, 3
The paper peel strength cannot be improved.

From the front side or back side of the gypsum board P,
A plurality of holes 4a and 4b that do not penetrate the plasterboard are provided at predetermined intervals from both sides (FIG. 1) or both sides (FIG. 2). Alternatively, a plurality of holes 4c penetrating the gypsum board itself are provided at predetermined intervals. (FIG. 3) At this time, the openings of the holes 4a, 4b that do not penetrate and the openings at both ends of the hole 4c that penetrates are in direct contact with the thin natural wood plates 4, 4, respectively.

The thin natural wood boards 4, 4, which are laminated on the front and back sides of the gypsum board P, are bonded with adhesive to the cardboard 2, 3 on the front and back sides of the gypsum board P, and can be hardwood veneer, softwood veneer, artificial board, etc. It could be something like that. Further, either a rotary cut veneer or a slice cut veneer may be used.

Further, the veneer is subjected to appropriate treatments such as coating or impregnating with resin, or coating or impregnating with chemicals such as insect repellents, fungicides, and flame retardants, as necessary.

The adhesive may be either thermosetting or room temperature curable, but it is preferable to use one that exhibits a small amount of shrinkage after curing. This is because if the amount of shrinkage is large, the composite board is likely to warp or twist after bonding. In addition, chemicals such as insect repellents, fungicides, and flame retardants may be mixed into the adhesive. When using a thermosetting adhesive, for example, a urea resin adhesive which is a water-based adhesive is generally used, but it is necessary to add an extender or the like to reduce the shrinkage force.

When using a thermosetting adhesive, the natural wood thin plates 4, 4 are adhesively laminated to the gypsum board P by heat pressing.

The heat pressing is preferably carried out at 0.5 to 10 kg/cm ² and at 80 to 110°C. If necessary, glue and deposit natural wood thin sheets for at least 15 minutes before hot pressing. At this time, apply the adhesive to both sides of the plasterboard using a spreader. By doing so, the adhesive penetrates into the cardboard on the front and back sides of the gypsum board, and the peel strength of the cardboard itself is improved by thermal curing. When using an adhesive that hardens at room temperature, the natural wood thin plates 4 are laminated via the adhesive and then cold pressed at 0.5 to 10 kg/cm ² using a cold press, a turnbuckle, or the like.

The thickness of one natural wood thin board is preferably in the range of 0.2 to 3 mm, but from the economical and performance standpoints, around 1 mm is preferable. If it is less than 0.2 mm, there will be little improvement in strength, and 3
This is because the shrinkage force and torsion of the wood will be affected if the thickness is larger than mm. After being integrated in this manner, the natural wood thin board is cut into a predetermined size to obtain the architectural board of the present invention.

(Effects of the present invention) The construction board material of the present invention has fire retardant properties, sound insulating properties (specific gravity
0.7 to 0.9), and because the natural wood thin plates 4 and 4 are on the surface, bending strength, impact resistance, and nail-pulling resistance are improved. It does not peel off from the cardboard when repapering (because the natural wood thin board disperses stress), and even when used as is without pasting decorative paper, the wood texture of natural wood can be obtained.

Further, since the holes 4a and 4b that do not penetrate the plasterboard or the holes 4c that do penetrate the plasterboard are provided, the inside of the building board has a large number of air holes, which improves the heat insulation and sound absorption properties.

Further, since the openings of the holes 4a, 4b, and 4c are in direct contact with the natural wood thin plate 4, ventilation with the outside atmosphere can be maintained. Therefore, holes 4a, 4b, 4
Since there is no condensation inside the wall, gypsum board does not deteriorate due to moisture and has good insulation and
Sound absorption properties can be maintained reliably.

By interposing cardboard between the gypsum board and the natural wood thin board, it improves the compatibility between the gypsum board and the natural wood thin board, and at the same time prevents the adhesive used from penetrating excessively into the natural wood thin board. prevent surface contamination of the resulting architectural boards. It also absorbs surface moisture and has the effect of keeping the surface of the natural wood thin board always dry, giving the natural wood thin board good surface properties.

[Brief explanation of drawings]

Figure 1: A sectional view of the plate material of the present invention, in which a hole 4a that does not penetrate is provided on the surface. Figure 2: Cross-sectional view when a hole 4b that does not penetrate the surface is also provided, Figure 3
Figure: A cross-sectional view when similarly penetrating holes 4c are provided. 1... core layer, 2... cardboard rolled up from the front side to the back side, 3... cardboard covering the back side, 4a, 4b...
Hole that does not penetrate, 4c... hole that penetrates.

Claims (1)

[Scope of Claim for Utility Model Registration] A core layer 1 made of arbitrarily colored gypsum, a cardboard 2 wrapped around the entire front surface and a part of the back surface of which covers the wood end in the longitudinal direction, and a part of the back surface. Thin natural wood boards are adhesively laminated on the front and back sides of a plaster board p which is integrated with cardboard 3 on the entire back surface including the 2 parts of cardboard on the front side that are rolled up to the top, and the core layer 1 is placed on at least one of the front and back sides of the core layer 1. Architectural board material using gypsum board, characterized in that holes 4a, 4b that do not penetrate through the board, or holes 4c that do penetrate through the board, and the openings of these holes 4a, 4b, and 4c are in direct contact with the thin natural wood board 4. .