JPH09117902A - Composite curved surface molded wood board and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a wooden composite curved surface formed plate having neither deformation such as warpage, twisting or the like, nor unevenness, nor poor bonding nor the like by a method wherein glass cloth sheets are provided in the layers of a laminate. SOLUTION: A laminate 14 is obtained by pasting a lower decorative member 1, a lower reinforcing core material 2, a lower glass cloth sheet 3, a plurality of core material veneers 4-10, an upper glass cloth sheet 11, an upper reinforcing core material 12 and an upper decorative member 13 together through a thermosetting adhesive such as a urea resin adhesive or the like into an integral body. The resultant laminate 14 is put in hot press molds having a desired curved surfaces so as to thermally press the laminate 14 for curved surface forming, resulting in obtaining the desired wooden composite curved surface formed plate. Thus, the wooden composite curved surface formed plate having neither deformation such as warpage, twisting or the like, nor unevenness, nor poor bonding nor the like can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite curved wooden board suitable for use in the fields of musical instruments, building materials, furniture, and other general wooden products, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a curved surface-molded wood board is a hot-press type having a desired curved surface, which is obtained by applying an adhesive to a plurality of veneers and stacking the veneers in multiple layers with the grain directions being orthogonal or parallel. By placing them in a plate and pressing them together, or by making the wood grains cross each other at right angles and adhering the core veneer and the decorative veneer to make a flat plywood, putting the flat plywood in a mold, and a direction perpendicular to the grain direction of the core veneer In addition, it was obtained by bending with the back of the tree as the outside and applying an adhesive to the inside of the bent flat plywood to bond the decorative veneer, and pressing and heating these to mold.

[0003]

However, in the case of the conventional curved surface-formed wooden board, when the curved surface is molded, compressive stress is generated inside the curved surface and tensile stress is generated outside, so that residual strain occurs in the member, or Due to the moisture gradient from the surface layer to the intermediate layer due to the hot pressing and the change of the water content in each veneer before and after the pressing, the water content in each member is biased. Therefore, in the obtained curved surface-formed wooden board, there is a problem that deformation such as warpage and twisting, unevenness, and defective adhesion occur.

Therefore, the present invention solves the above problems,
An object of the present invention is to provide a composite curved surface-shaped wooden board that is free from deformation such as warp and twist, unevenness, and adhesion failure, and a method for manufacturing the same.

[0005]

A composite curved surface-molded wood board according to the present invention comprises a decorative member, an additional core material, a sheet of glass cloth, and a plurality of core materials which are laminated with the grain directions at least orthogonal or parallel to each other. Is a composite wood board obtained by integrally bonding and through a thermosetting adhesive, and is formed by curved surface molding by heat pressing.

A sheet of the glass cloth is provided between the decorative member and the sprinkler material, or between the sprinkler material and the outermost core material of the plurality of core materials, or the plurality of core materials. It is pasted between the core materials via a thermosetting adhesive.

The method for manufacturing a composite curved surface-shaped wooden board according to the present invention comprises a lower decorative member, a lower splint core material, a sheet of lower glass cloth, and a plurality of core materials which are laminated with their grain directions at least orthogonal or parallel to each other. The sheet of upper glass cloth, the upper core material, and the upper decorative member are bonded together by using a thermosetting adhesive to be integrated to obtain a composite wood body that is a laminated body, and then the composite wood body. Is placed in a hot press mold having a desired curved surface, and heated and pressed to mold the curved surface.

The lower and upper glass cloth sheets are provided between the lower decorative member and the lower core material and between the upper core member and the upper cosmetic member, respectively, or
Between the lower core material and the lowermost core material of the plurality of core materials, and between the uppermost core material of the plurality of core materials and the upper core material, a thermosetting adhesive is interposed. You may attach it. Alternatively, the upper and lower sheets of glass cloth may be adhered to each other between the plurality of core materials via a thermosetting adhesive.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a composite curved surface-shaped wooden board and a method for manufacturing the same according to the present invention will be described.

The composite curved surface-shaped wood board of the present invention comprises a plurality of decorative members, sprinklers, sheets of glass cloth, and a plurality of sheets in which the wood grain directions are orthogonal or parallel to each other, or the orthogonal and parallel directions are mixed. A composite wood board, which is a laminate formed by integrally bonding a core material and a thermosetting adhesive such as a urea resin adhesive, is formed by curved surface molding by heating and pressing.

As the core material, for example, a single plate, OSB (or
Oriented strand board: It is desirable to use oriented PB), hard board, etc. In addition, it is desirable to alternately stack these core materials so that the grain directions are orthogonal to each other and stack a desired number of sheets in order.

As the decorative member, for example, natural wood,
It is desirable to use a laminated board impregnated with decorative wood, a resin such as pheno resin, or a paper impregnated with phenol resin.

The core material may be, for example, plywood or OS.
It is desirable to use B, a hard board, or the like. It is desirable that the sprinkling material is laminated and pasted with its grain direction orthogonal to the grain direction of the core material closest to the sprinkling material.

As the glass cloth sheet, it is desirable to use, for example, non-woven fabric, woven fabric, kumfu or the like.

The composite curved surface-shaped wooden board of the present invention comprises a decorative member (lower decorative member), a splint material (lower sponge material), a glass cloth sheet (lower glass cloth sheet), and a plurality of core materials. And a glass cloth sheet (upper glass cloth sheet), a core material (upper core material), and a decorative member (upper decorative member) using a thermosetting adhesive such as a urea resin adhesive. It can be manufactured by laminating and integrating to obtain a laminated body, and then placing the laminated body in a mold for hot pressing having a desired curved surface and heating and pressing to form a curved surface. At this time, the lower and upper glass cloth sheets are respectively provided between the lower core material and the lowermost core material of the plurality of core materials, and the uppermost core material of the plurality of core materials and the upper core material. It may be attached to the core material, or
The same thermosetting as described above between the lower decorative member and the lower core material and between the upper core member and the upper core member or between arbitrary core materials of the plurality of core materials. It may be attached via a hydrophilic adhesive. In addition, in the core material composed of the plurality of core materials, these core materials are superposed with the grain directions orthogonal to or parallel to each other or a mixture of the orthogonal and parallel with each other via the thermosetting adhesive similar to the above. .

For example, the composite curved surface molded wood board of the present invention is
A lower core material, which is a plywood coated with thermosetting adhesive such as urea resin adhesive, is attached to the lower decorative member, and the lower glass cloth sheet is attached to the lower core material. A plurality of core materials are laminated on the sheet of the lower glass cloth through an adhesive similar to the above so that the grain directions are orthogonal to each other or parallel to each other, or orthogonal and parallel are mixed, and then laminated. A sheet of upper glass cloth is laminated on the uppermost core material of the plurality of core materials via a thermosetting adhesive similar to the above, and the same adhesive as described above is applied on the sheet of the upper glass cloth. An upper core material, which is a plywood coated on both surfaces, is bonded, and then an upper decorative member is bonded on the upper core material. At this time, a sheet of lower glass cloth is pasted onto the lower decorative member via the same adhesive as before before the lower core material is pasted onto the lower decorative member, and Before pasting the sheet of upper glass cloth on the top core material of the core material,
The upper core material of the uppermost layer may be laminated with an upper core material, which is a plywood coated with the same adhesive on both sides, and then a sheet of upper glass cloth may be laminated.

In the composite curved surface-formed wood board of the present invention, a thermosetting adhesive such as a urea resin adhesive is applied to each surface of a plurality of core materials, and the plurality of core materials are orthogonal to each other in the grain direction. Or flattened in parallel or mixed with orthogonal and parallel to produce a flat plywood as a core material separately, and using this flat plywood as described above, a decorative member, a spliner, a sheet of glass cloth, etc. It may be integrated with each element by laminating.

The above-mentioned glass cloth sheet is used because the glass fiber has high tensile strength, high heat retention, high temperature resistance and flame resistance, low elongation, and excellent heat insulation and soundproofing. This is because the characteristics such as that of being used are utilized.

The composite wood board, which is a laminate obtained as a result of such integration, is placed in a hot press mold having a desired curved surface, and the laminate is heated and pressed to form a desired curved surface. The composite curved surface molding wood board of is obtained. As the pressing conditions at this time, for example, a pressure of about 8 to 12 kgf / cm ² , a temperature of about 110 to 115 ° C., and a pressing time of about 15 to 17 minutes are used.

[0020]

EXAMPLE Next, an example of the composite curved surface-formed wood board of the present invention will be described in more detail with reference to FIG.

Example 1 First, two 0.7 mm thick decorative members (phenol resin impregnated paper) 1 and 13, and two 1.25 mm thick core materials (natural wood veneer) 2 And 1
2. Two 0.2 mm thick glass cloth sheets (glass fiber cloth KC1010 manufactured by Nitto Boseki Co., Ltd.)
B104EV2) 3 and 11, two 3.2 mm thick veneer core plates (natural wood veneer) 4 and 8, 1.25 mm thick
3 core veneers (natural wood veneers) 5, 7 and 9 and two 2.0 mm thick core veneers (natural wood veneers) 6
And 10 were prepared and a composite curved surface-shaped wooden board was manufactured as follows. Here, the size of each material is 35
It was 0 × horizontal 4700 mm.

As shown in FIG. 1, on the lower decorative member 1,
Urea resin adhesive UC-131 (trade name, manufactured by Aika Kogyo Co., Ltd.), which is a thermosetting adhesive, is bonded to the lower core material 2 which is a plywood coated on both sides, and the lower core material 2 is attached. The lower glass cloth sheet 3 is attached to the above, and the single plate 4 is attached to the lower glass cloth sheet 3 via the same adhesive as described above so that the wood grain direction is orthogonal to the core material 2, and then the same as above. The veneers 5, 6, 7, 8, 9 and 10 are laminated in order so that the grain directions are orthogonal to each other via an adhesive, and the upper glass is placed on the veneer 10 via the same adhesive as described above. A sheet 11 of cloth is laminated, and then an upper core material 12 which is a plywood coated with thermosetting adhesive similar to the above on the sheet 11 of glass cloth is applied to the veneer 10 in the grain direction. Laminated so that it is orthogonal to the grain direction, and the upper decorative member on top of it 3 laminated to obtain a composite wood board 14 is a laminate. Here, urea resin adhesive UC-131 was used as the adhesive.

At this time, the glass cloth sheet 3 is attached to the lower decorative member 1 instead of the lower core material 2, and the glass cloth sheet 11 is attached to the core material veneer 10. The same operation was carried out for the case of pasting on the core material 12 which was pasted on the single plate 10 instead of on the above. Further, the case where the sheets 3 and 11 of the glass cloth were stuck between the single plates 4 and 5 for the core material and between the single plates 9 and 10 for the core material were also carried out.

The composite wood board 14 which is a laminated body obtained by integrating in this way is put in a hot press mold having a desired curved surface, and the composite wood board 14 is heated and pressed to form a curved surface. Thus, a desired curved surface-shaped wooden board was obtained.
The pressing condition at this time is about 8 to 12 kgf / cm.
A pressure of ² , a temperature of 110 ° C., a clamping time of 15 minutes was used. All the obtained composite curved surface-formed wooden boards were free from deformation such as warpage and twisting, and neither unevenness nor defective adhesion was observed.
Further, when the water content of the veneer before and after hot pressing was measured, it was changed to 7 to 8% as compared with 8 to 14% before pressing.

Comparative Example 1 The method described in Example 1 above was repeated without using sheets 3 and 11 of glass cloth. The obtained composite curved surface-formed wooden board was deformed such as warped and twisted, and unevenness and defective adhesion were also observed. Further, when the water content of the veneer before and after hot pressing was measured, it was changed from 8 to 15% before pressing to 8 to 10%.

In the above embodiment, the core material is formed by laminating seven single plates, but this number is for the purpose of explanation, and the number of laminated layers is not limited.

[0027]

EFFECTS OF THE INVENTION According to the present invention, by providing a sheet of glass cloth in a layer of a laminated body, there is provided a composite curved surface molded wood board which is free from deformation such as warpage and twisting, unevenness and adhesion failure.

[Brief description of the drawings]

FIG. 1 is a schematic partial cross-sectional view showing the structure of a laminated body of a composite curved surface-formed wooden board of the present invention before curved surface molding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower decorative member 2 Lower core material 3 Sheet of lower glass cloth 4, 5, 6, 7, 8, 9, 10 Single plate for core material 11 Sheet of upper glass cloth 12 Upper core material 13 Upper decorative member 14 Lamination Body (composite wood board)

Claims (4)

[Claims] 1. A decorative member, an additive core material, a sheet of glass cloth, and a plurality of core materials which are laminated with their grain directions at least orthogonal or parallel to each other are integrally bonded via a thermosetting adhesive. A composite curved wooden board, which is a composite wooden board that is formed by curved molding by heating and pressing. 2. A sheet of the glass cloth is provided between the decorative member and the core material, or between the core material and the core material of the outermost layer of the plurality of core materials, or The composite curved surface-formed wood board according to claim 1, wherein the plurality of core materials are attached via a thermosetting adhesive. 3. A lower decorative member, a lower core material, a lower glass cloth sheet, a plurality of core materials which are superposed with the grain directions at least orthogonal or parallel to each other, an upper glass cloth sheet, and an upper additive. The core material and the upper decorative member are bonded together using a thermosetting adhesive to be integrated to obtain a composite wood board, and then this composite wood board is put into a hot press mold having a desired curved surface and heated. A method for manufacturing a composite curved surface-formed wooden board, which comprises pressing and forming a curved surface. 4. The lower and upper glass cloth sheets are respectively provided between the lower decorative member and the lower core material and between the upper core material and the upper cosmetic member, or
Between the lower core material and the lowermost core material of the plurality of core materials, and between the uppermost core material of the plurality of core materials and the upper core material, or the plurality of core materials. The method for manufacturing a composite curved surface-formed wood board according to claim 3, wherein the wood board is attached between the two by a thermosetting adhesive.