JPH0247012Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) This invention is a wood-based plate material, especially a wood-based board with excellent heat insulation, dimensional stability, and moisture control properties that is used as a base material for walls or ceilings to which wallpaper or cloth is attached. It relates to shaped materials. (Problems to be solved by the prior art and the invention) In general, wood-based plate-like materials such as wood fiberboard and particle board are widely used as construction materials, but these wood-based plate-like materials have porous Although it has excellent heat insulation properties, it also has high moisture absorption and release properties. In particular, wood fiberboards such as insulation boards are lightweight and have excellent heat insulation and humidity control properties, so they are often used as wall bases, etc. However, they tend to absorb moisture within the walls and cause them to stretch or warp. . Moreover, when insulation board is used as a base material to which cloth or wallpaper is attached, there is a problem that the adhesive property is poor because the adhesive is absorbed quickly. On the other hand, the applicant previously devised U.S. Pat. This material is made by providing a moisture-proof layer on the back side of a porous wood-based plate material such as an insulation board, and attaching plywood to the surface to prevent warping due to moisture absorption. However, this method had a problem in that the humidity control effect on the indoor side was hindered by the plywood, resulting in a reduced humidity control effect. Furthermore, when attempting to form a moisture-proof layer by applying a moisture-proof paint to a porous wood-based plate material, pinholes are likely to occur due to uneven absorption, making it difficult to obtain a dense moisture-proof layer. For this reason,
In order to prevent the occurrence of pinholes, it is necessary to apply multiple coats of paint, which poses a problem in that production is time-consuming. In view of the above-mentioned problems, an object of the present invention is to provide a wood-based plate-like material suitable for a base material, which has good moisture control properties on the indoor side, and has good dimensional stability and productivity. (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides heat treatment using vinylidene chloride-based resin or vinyl chloride-based resin containing scale-like substances with a size of 300μ or less on the back side of the wood fiberboard. A moisture-proof layer made of a plastic resin coating is provided, and plywood having a large number of through holes is laminated and integrated on the surface of the wood fiberboard. (Function) Therefore, according to the present invention, while the moisture-proof layer provided on the back side of the wood fiberboard prevents moisture from entering,
The plywood provided on the surface of the wood fiberboard makes it easy to attach wallpaper or cloth, and the wood fiberboard absorbs and releases moisture through the through holes of the plywood. (Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings. The wood-based plate-like material according to this embodiment is a plywood material in which a moisture-proof layer 2 is provided on the back surface of a wood fiberboard 1 and a large number of through holes 4 are provided on the surface of the wood fiberboard 1, as shown in the figure. By laminating and integrating the plywood 3, wall covering materials such as cloth can be attached to the surface of the plywood 3. As the wood fiber board 1, for example, there is an insulation board with a thickness of 9 mm and a specific gravity of 0.28, etc. In particular, those with a specific gravity of 0.2 to 0.4 have high hygroscopicity, and the plywood 3
This is preferable because it absorbs and releases moisture smoothly through the through holes 4. The moisture-proof layer 2 protects the wood fiber board 1 from moisture, but simply applying a moisture-proof paint will cause the problem described in the conventional example, so the present invention aims to solve this problem. For moisture-proof paint
The feature is that the moisture-proof layer 2 is formed by containing a scale-like substance with a size of 300μ or less, which is applied and dried. The scale-like substance in the moisture-proof layer according to the present invention prevents the formation of pinholes when forming the moisture-proof layer, and also prevents moisture from permeating by arranging and stacking them in parallel in the coating film. , has extremely important significance, and for example, scale-like powder or scale-like pigment of 300μ or less made of aluminum, stainless steel, iron oxide, etc. is used. Here, we use something with a size of 300μ or less because
This is to completely bury the scale-like substances in the coating film in a horizontally arranged and laminated state, thereby increasing the moisture permeation resistance and preventing the occurrence of pinholes. According to this example, by mixing the scale-like substance, it is possible to prevent the penetration of moisture with a relatively small amount of coating, and the coating film is made thinner to suppress expansion and contraction due to temperature changes, so the perforated plywood Even if a board with a relatively weak binding force is attached to a wood fiberboard, the entire board is unlikely to warp. Next, as the resin forming the moisture-proof layer 2 itself, a thermoplastic synthetic resin such as vinylidene chloride resin or vinyl chloride resin is used. This is to give the moisture-proof layer 2 appropriate flexibility and prevent the occurrence of cracks in the coating film. The synthetic resin may be used in the form of an emulsion such as vinylidene chloride emulsion or vinyl chloride emulsion. Further, the viscosity is preferably as low as possible in consideration of the leafing property of the scale-like substance (property of being arranged in parallel in the coating film), but in consideration of the suction of the plate-shaped substrate, 50 to 300 cps is appropriate. Next, when considering the density of the moisture-proof layer, it is preferable that the coating amount be as large as possible, but when economical efficiency is considered, a range of 50 to 300 g/m ² is appropriate. Further, the amount of the scale-like substance mixed is preferably 2 to 10% by weight considering the uniformity of embedding and dispersion in the coating film. The plywood 3 having through-holes 4 has the number and diameter of the through-holes 4 set to such an extent that the moisture absorption and desorption properties of the wood fiberboard 1 are not significantly impaired. Pitch the through hole 15
It is sufficient if they are uniformly provided in mm. According to the base material for cloth upholstery constructed as in this embodiment, moisture absorption and release from the back side of the wood fiberboard 1 is prevented by the moisture-proof layer 2, so that warping due to stretching from the back side can be prevented, and warping can be prevented. Even if the wood fiberboard 1 absorbs and desorbs moisture through the through holes 4 of the plywood 3, the surface side of the wood fiberboard 1 is restricted by the plywood 3, so the structure as a whole is unlikely to warp. Become. Moreover, the moisture on the indoor side is absorbed and released by the wood fiber board 1 through the through holes 4, and a humidity control effect is also exhibited. Furthermore, plywood has the advantage of having a fixing force when fixed by nailing, making nailing work easier. Experimental Example Next, an experiment regarding the moisture-proof performance of the moisture-proof layer according to the present invention will be explained. In Experimental Examples 1 and 2, which are experimental samples, one side of the insulation board was sealed with an undercoat paint, and then 150 μm of vinylidene chloride emulsion containing aluminum flake-like powder of 50 to 150 μm was applied.
It is formed by coating and drying at a ratio of g/m ² . The sealing was done by sanding the surface of the insulation board to make it smooth, then applying an undercoat having the composition shown below, and drying it with a heat roll. [Undercoat] Ingredients (wt%) Polyvinyl alcohol ……0.5 Vinyl acetate emulsion (solid content 50%)
……10.0 Dispersant ……0.2 Calcium carbonate ……54.0 Water ……35.3 Although this sealing is not always necessary, to prevent the insulation board from being sucked in, it is recommended to seal it by applying an undercoat. Afterwards, it is preferable to form a moisture barrier layer. The component compositions of the paints of Examples 1 and 2 in which moisture-proof layers containing aluminum flaky powder were formed are shown in Table 1. The component composition of a comparative example paint in which a layer was formed is also shown.

[Table] The moisture permeability resistance of each of Example 1, Example 2, and Comparative Example in which a moisture-proof layer was formed with a paint having the above-mentioned component composition was measured. The results are shown in Table-2. The coating amount was 150 g/m ² in both cases.

[Table] As is clear from the results shown in Table 2 above,
Examples 1 and 2 have a moisture permeation resistance that is 3 to 4 times higher than that of the comparative example, and moisture absorption from the back side is prevented, resulting in less dimensional changes and warping due to moisture. Furthermore, since the moisture barrier layer reflects radiant heat, it was found to be useful as a base material with high heat insulation properties. (Effects of the invention) As is clear from the above explanation, according to the invention, the scale-like substances in the moisture-proof layer are arranged horizontally and stacked on each other, thereby preventing the occurrence of pinholes and improving the moisture-proof property. A dense moisture-proof layer with excellent properties can be obtained. Therefore, it is possible to obtain a wood-based plate-like material that is less affected by moisture, has excellent dimensional stability, and has excellent heat insulation properties because the moisture-proof layer reflects radiant heat. Furthermore, since the scaly substance prevents pinholes from forming in the moisture-proof layer, there is no need for multiple coats of paint to form a dense moisture-proof layer, improving productivity. Furthermore, the moisture-proof layer provided on the back side of the wood fiberboard prevents moisture absorption from the inside of the wood fiberboard wall.
In addition to preventing the wood fiberboard from expanding and contracting from the back side, the plywood with through holes provided on the surface of the wood fiberboard restricts expansion and contraction from the front side of the wood fiberboard, so warping occurs as a whole. Hateful. Moisture on the indoor side is absorbed and released by the wood fiberboard through the through-holes provided in the plywood, which prevents warping and creates a wood-based plate-like material that has moisture control properties for the indoor side. There is an effect that can be obtained.

[Brief explanation of drawings]

The figure is a partial perspective view showing a wood-based plate-like material according to the present invention. 1...Wood fiberboard, 2...Moisture-proof layer, 3...Plywood, 4...Through hole.

Claims (1)

[Scope of claim for utility model registration] (1) A moisture-proof layer consisting of a coating of thermoplastic resin such as vinylidene chloride or vinyl chloride resin containing scale-like substances with a size of 300μ or less on the back side of a wood fiberboard. A wood-based plate-like material characterized in that the wood fiberboard is provided with plywood having a large number of through holes laminated and integrated on the surface of the wood fiberboard. (2) The wood-based plate-like material according to claim 1, wherein the scale-like substance is a scale-like powder of aluminum.