JPH0639974Y2 - Wood molding - Google Patents

Description

[Detailed Description of the Invention] "Industrial application field" The present invention relates to a wood-molded product having a metal plate as a core material. By using a punched metal plate as a core material, three-dimensional bending is performed at the time of manufacturing. It is possible to prevent material cracking and material wrinkling in the parts such as and to improve the adhesion durability.

“Prior art and its problems” Applying urea resin adhesive to multiple wood veneers and stacking them, insert them into the male and female molds of the clamping jig consisting of male and female molds, and clamp. A wood molded product is known in which a jig is compressed by a press and heated to be molded into a desired shape.

However, this wooden molded product has the drawback of lacking rigidity, and when molded in a complicated situation, the adhesive durability, for example, the adhesiveness in a high temperature environment, is low, resulting in peeling and cracking of veneer. There was a problem.

In order to solve the lack of rigidity of this conventional wood molded product, a wood molded product is known in which a metal plate such as an aluminum plate is arranged as a core material in a plurality of wood veneers and laminated and molded.

However, although this product can solve the lack of rigidity, the difference in stress between the wood veneer and the metal plate due to bending is large, so material cracks and wrinkles occur at the parts of the three-dimensional bending process during manufacturing. There is a problem that it is easy to do,
Further, since the difference in the coefficient of thermal expansion between the wood veneer and the metal plate is large, there is a problem that the adhesion durability is further insufficient as compared with the previous one.

[Means for Solving Problems] Therefore, in the present invention, a bent wooden product is used, and a core material made of a punched metal plate and at least one of front and back surfaces of the core material are provided. Core material made of natural wood veneer provided on the side (hereinafter abbreviated as core material).
And a front decorative material (hereinafter abbreviated as front decorative material) made of a natural wood decorative veneer provided on the outermost side of at least one of the front and back surfaces of the core material. The holes formed by punching have a dense and dense distribution, and the opening ratio of the bent portion is higher than the opening ratio of the non-bent portion. To prevent the material from cracking and wrinkle, and to improve the adhesive durability by infiltrating the adhesive into the core material and penetrating it to cure.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a first example of a wood-molded product of the present invention, in which reference numeral 1 is a wood-molded product. This wood molding 1
Is a molded product having a substantially U-shaped cross section in which both end portions are bent and the bent portions A, A are formed in a curved shape, and the adhesive layers 3, 3, the sponge material 4, 4, the adhesive layers 5, 5, and the front decorative materials 6, 6 are sequentially laminated to form a plywood.

Here, the core material 2 has a thickness made of a metal plate such as an aluminum plate, an aluminum alloy plate, a stainless plate, and an iron plate.
A punching metal with a thickness of about 0.2 to 2.0 mm is used, and a metal having a surface treatment such as degreasing treatment or phosphate treatment for improving the adhesiveness is used. Further, as the punching metal, for example, the one shown in FIG. 2 in which holes are formed with a coarse and dense distribution is adopted according to the required specifications, and the hole diameter is about 1.0 to 4.5 mm and the aperture ratio is 20 to About 50% is preferably used.

As the adhesive forming the adhesive layers 3 and 3 between the core material 2 and the sponge core materials 4, 4, any adhesive can be used as long as it can adhere the core material 2 and the sponge core materials 4, 4 well. For example, an epoxy resin-based adhesive, a phenol resin-modified rubber-based adhesive, a urea resin-based adhesive or the like is used, and the thickness thereof is about 50 to 500 μm. As the core materials 4 and 4, natural wood veneer having a thickness of 0.2 to 1.0 mm is used, and a flexible material is preferable so as to be suitable for molding, and beech veneer is mainly used. It is not limited to this.

The adhesive forming the adhesive layers 5 and 5 between the cores 4 and 4 and the surface decorative materials 6 and 6 is one that favorably adheres the cores 4 and 4 to the surface decorative materials 6 and 6. All you need is an epoxy resin type,
Vinyl acetate-based, EVA resin-based, melamine resin-based, phenol resin-based, urea resin-based, urethane resin-based adhesives, etc. can be used. The thickness of the adhesive layers 5 and 5 is also about 50 to 500 μm, like the adhesive layers 3 and 3. The surface decorative materials 6 and 6 are preferably those having a thickness of 0.2 to 1.0 mm, such as a bird's eye maple decorative veneer having a beautiful wood grain pattern as the surface material, but are not limited thereto. Further, it is preferable from the standpoint of moldability that the fiber cores 4 and 4 and the surface decorative materials 6 and 6 are laminated by making their fiber directions orthogonal to each other or obliquely intersecting at a certain angle.

In order to mold the wood molding 1 having such a structure,
An adhesive is applied to each of the core material 2, the additional core materials 4 and 4, and the surface decorative materials 6 and 6 to be laminated, and then inserted between male and female molds of a pressing jig, and then heated and pressed to bond the adhesive. While being cured, the plywood consisting of the core material 2, the sponge core materials 4, 4 and the surface decorative materials 6, 6 is deformed to form the curved surface shape shown in FIG.

In such a wood-molded article 1, by using punching metal for the core material 2, it is possible to prevent material cracking and material wrinkling at the time of manufacturing, improve adhesion durability, and further improve desired rigidity. Is obtained. That is, when a metal plate having no ordinary holes is used as the core material, the stress of bending of wood materials such as sprinkling materials and surface decorative materials is lower than that of the core material. As a result, the wood material cannot withstand the stress of the core material and is distorted, causing material cracks and material wrinkles. On the other hand, in the case of using the punching metal for the core material 2, by increasing the aperture ratio of the punching metal, the stress against bending of the core material 2 can be reduced to be almost equal to that of the wood material. It is possible to prevent material cracking and material wrinkling due to the difference in stress. When a normal metal plate is used as the core material, for example, when the wood molded product 1 is subjected to heating, cooling, or heating / cooling cycles, a difference in the coefficient of thermal expansion between the core material and the wood material causes the bonding interface between the two. Shear stress is generated based on this difference, which causes adhesive failure. However, in the wood molded article 1 shown in FIG. 1, the adhesive layers 3 and 3 penetrate through the holes of the core material 2 to form a bridge and are integrated. Therefore, the sprue core materials 4 and 4 are directly bonded by the adhesive layer 3, whereby the shear stress in the core material and the wood-based material described above is relaxed, the adhesion failure is prevented, and the adhesion durability is enhanced. Further, in this wood molded product 1, since the core material 2 is made of metal, sufficient rigidity can be obtained.

Since the above-mentioned material cracks and material wrinkles are likely to occur in a three-dimensionally bent portion where the amount of change is large, punching metal having holes having a dense and dense distribution as shown in FIG. By arranging the portion having a high rate so as to correspond to the bent portion, it is possible to better prevent the occurrence of the cracks and wrinkles.

FIG. 3 shows a second example of the wood-molded product of the present invention. The wood-molded product shown in this figure is the wood-molded product 1 shown in FIG. 4 and the adhesive layer 3a, 3a,
The rubber sheets 7 and 7 are provided via 3b and 3b.

Here, the rubber sheet 7 is made of natural rubber, styrene butadiene rubber, acrylonitrile butadiene rubber, chloroprene rubber, butadiene rubber, isoprene rubber, ethylene propylene rubber or the like and has a thickness of 0.05 to 1.0 m.
A sheet having a size of about m is used which has been subjected to surface activation treatment such as dichromic acid-sulfuric acid treatment or corona discharge treatment for improving adhesion. As the adhesive forming the adhesive layers 3a, 3a between the core material 2 and the rubber sheets 7, 7, for example, epoxy resin-based, urethane resin-based, nitrile rubber-based, chloroprene rubber-based adhesives, etc. are used. Its thickness is about 50 to 500 μm. Furthermore, the rubber sheet 7,
As the adhesive forming the adhesive layers 3b and 3b between the core 7 and the sprinklers 4 and 4, for example, an epoxy resin-based adhesive, a phenol resin-modified rubber-based adhesive, a urethane resin-based adhesive or the like is used, and the thickness is 50 to It is about 500 μm.

In the wood-molded product having such a configuration, since the rubber sheet is interposed between the core material 2 and the sprinkler materials 4 and 4, thermal expansion of the core material 2 and the sprinkler materials 4 and 4 is performed. The shear stress generated at the adhesive interface between the two due to the difference in the rate is absorbed as elastic deformation of the rubber sheets 7, 7, and therefore the adhesive durability is further enhanced.
Further, it is needless to say that this wooden molded product can also obtain the same operational effect as the wooden molded product 1 shown in FIG.

4 to 8 show another example of the present invention. The example shown in FIG.
A rubber sheet 7, a core material 2, a rubber sheet 7, and an additive core material 4 are sequentially laminated from the front side via an adhesive layer. The example shown in FIG. 5 is a surface decorative material 6, an additive core material 4, A core material 2 and an additional core material 4 are sequentially laminated from the front side via an adhesive layer. In the example shown in FIG. 6, the surface decorative material 6, the core material 2, and the additional core material 4 are interposed via an adhesive layer. The layers are sequentially laminated from the front side. further,
The example shown in FIG. 7 is one in which the surface decorative material 6, the sprinkler material 4, the rubber sheet 7, and the core material 2 are sequentially laminated from the surface side via the adhesive layer, and the example shown in FIG. 8 is a table. The decorative material 6, the sprinkler material 4, and the core material 2 are sequentially laminated from the front surface side via an adhesive layer. Further, in the configuration of the embodiment shown in FIG. 5, the front decorative material 6 may be further laminated on the core material 4 on the back surface side, and the outermost layers on both front and back surfaces may be the front decorative material 6, and the example of FIG. In the above configuration, the front decorative material 6 may be laminated on the back surface of the core material 2, and the outermost layers on both the front and back surfaces may be the front decorative material 6.

Then, in any of the other embodiments of the wood-molded product of the present invention, the same effect as that of the first example of the wood-molded product of the present invention shown in FIG. 1 can be obtained.

Further, in the wood-molded product of the present invention, the rubber sheet 7 can be optionally used as an intermediate layer between the core material 2 and the splint material 4. By using this rubber sheet 7, The adhesion durability can be further enhanced.

In the above example, the core materials 4, 4 or the rubber sheets 7, 7 may be punched if necessary, in which case the above-mentioned material cracking, material wrinkle prevention, adhesion durability improvement, etc. The effect is further enhanced.

Further, the shape of the wood-based molded product of the present invention is not limited to that shown in FIG. 1, but can be applied to molded products of any other shape having a curved surface in two parts, and particularly complicated curved surface. It is suitable for those having a shape.

"Example" A wood molded product shown in Fig. 1 was produced. For the core material, the same punched aluminum plate (2S) as shown in Fig. 2 is used. The 0.8 mm thick aluminum plate (2S) is used as the sponge core material, and the 0.5 mm bird's eye maple makeup is used as the front cosmetic material. Epoxy resin adhesive (Ciba Geigy,
Aradite 136N / HY-994 = 100/40) was used, and the molding conditions were a temperature of 80 ° C., a pressure of 1.5 MPa, and heat and pressure for 30 minutes.

At the time of molding, even in the bent portion, no material cracks or material wrinkles were observed in the surface decorative material and the core material. Also, after molding, leave the molded wood product at 50 ° C and 95% RH for 16 hours, then
When this molded product was inspected after repeating 10 times of leaving at 8 ° C. for 8 hours, no abnormalities such as peeling were observed.

[Effect of the Invention] As described above, the wood-molded product of this invention is a wood-molded product in which a part is bent, and a punched metal plate is used as the core, and The holes formed by punching have a dense and dense distribution, and the opening ratio of the bent portion is higher than that of the non-bent portion. Material cracking and material wrinkling are prevented, and the adhesive durability is greatly improved by penetrating and penetrating the adhesive in the core material to cure it. Furthermore, since a metal plate is used for the core material, high rigidity is achieved. Is obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first example of the wood-molded product of the present invention, FIG. 2 is a plan view of a main part showing an example of a core material in the wood-molded product of the present invention, and FIGS. FIG. 3 is a sectional view of a main part showing another example of the wood-molded product of the present invention. 1 ... Wood molded product, 2 ... Core material, 4 ... Addition core material, 6 ... Front decorative material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-219141 (JP, A) Actual development 59-26325 (JP, U) JP-B 60-54862 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. A wood-molded product, a part of which is bent, comprising a core material made of a punched metal plate, and natural wood provided on at least one side of the front and back surfaces of the core material. A core material made of a single plate and a front decorative material made of a natural wood decorative veneer provided on the outermost side of at least one of the front and back surfaces of the core material; Has a dense and dense distribution, and the opening ratio of the bent portion is higher than that of the non-bent portion.