JPH11333811A - Coated building board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent cracks or a peeling from occurring and make the appearance presentable and increase the surface hardness by attaching a thin wood veneer to the surface of a base material plywood through a medium-density wood fiberboard and extending the edge part of a decorative coating film layer formed on the surface of the thin wood veneer so that the edge part covers the end face of the medium- density wood fiberboard. SOLUTION: A medium-density wood fiberboard(MDF board) 2 is interposed on the surface of a base material plywood 1 and then a thin wood veneer 3 is attached. Further, a decorative coating film layer 4 is formed on the surface of the thin wood veneer 3, and the edge part of the decorative coating film layer 4 is extended so that the edge part covers the edge face of the MDF board 2. In addition, a chamfered part 6 is formed on the front side corner edge of the MDF board 2, across the area from the thin wood veneer 3 to the board 2, and the edge part 5 of the decorative coating film layer 4 is extended so that the chamfered part 6 is covered. Thus it is possible to prevent the cracks of the decorative coating film layer 4 from occurring and thereby make it impact-resistant and also load-resistant. Besides, the MDF board 2 is hardly made stretchable and deformable, and the generation of cracks on the edge face and the peeling of the thin wood veneer 3 are prevented from occurring and further the coating finish is made to appear presentable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing an MD on a plywood substrate.
The present invention relates to a painted architectural board constructed by laminating and integrating an F board (medium density wood fiber board), a thin wood veneer, and a decorative coating layer, for example, as a floor material.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
2. Description of the Related Art A painted building board in which a thin wooden veneer 3 is adhered to the surface of a thin wooden veneer 2 with an MDF board 2 interposed therebetween and a decorative coating layer 4 is formed on the surface of the thin wooden veneer 3 is known. In this case, since the surface hardness of the MDF board 2 is high, the decorative coating layer 4 formed on the surface of the thin wooden veneer 3 is unlikely to crack.

[0003]

However, in the above-mentioned prior art, since the MDF board 2 easily expands and contracts due to moisture absorption, the boundary between the MDF board 2 and the thin wooden veneer 3 adhered to the surface thereof. There is a problem that the MDF board 2 is peeled off at a portion or a crack is generated on an exposed end face of the MDF board 2.

[0004] The present invention has been invented in order to solve all the problems in the prior art described above, that is, the problem is to crack the end face of the MDF board and to reduce the thickness of the thin wooden veneer attached to the surface. An object of the present invention is to provide a painted building board which is prevented from peeling off, has a good appearance by a decorative coating layer, has a high surface hardness and is optimal as a flooring material.

[0005]

According to a first aspect of the present invention, there is provided a painted building board, wherein a thin wood veneer is adhered to the surface of a base material plywood with an MDF board interposed therebetween. The decorative coating layer is formed on the MDF board so as to cover the end face of the MDF board.

Accordingly, in this case, the thin wooden veneer is adhered to the surface of the base material plywood via the MDF board, and the decorative coating layer is formed on the surface of the thin wooden veneer.
Since the surface hardness of the board is high, the decorative coating layer formed on the surface of the thin wooden veneer is hardly cracked, and has an impact resistance and a load resistance, so that it is optimal as a floor material. Moreover, since the edge of the decorative coating layer is extended so as to cover the end face of the MDF board, the MDF board is prevented from absorbing moisture from the end face, and is less likely to expand and contract. Generation and peeling of the thin wooden veneer are prevented, and the edge of the decorative coating layer is also covered up to the peripheral edge, so that the appearance of the finished paint is good.

A painted building board according to a second aspect of the present invention is characterized in that, in the painted building board according to the first aspect, the edge of the decorative coating layer is extended until it reaches the end face of the base material plywood. And Therefore, in this case, particularly, since the edge of the decorative coating layer covering the end face of the MDF board extends to the end face of the base material plywood, the end face of the MDF board is sealed and the The end surfaces of the thin veneer, the MDF board, and the base material plywood are joined to each other at the edge of the decorative coating layer, so that peeling of the woody veneer is reliably prevented.

According to a third aspect of the present invention, there is provided the painted building board according to the first or second aspect, wherein a chamfered portion is formed on a front edge of the thin wooden veneer to the MDF board. The edge portion of the decorative coating layer is extended so as to cover the portion. Therefore, in this case, particularly, since the edge of the decorative coating layer is extended along the chamfered portion, the bending angle of the edge of the decorative coating layer is reduced, and the same at the front side corner. Cracks at the edges of the decorative coating layer are reliably prevented.

[0009]

FIG. 1 shows an embodiment corresponding to all of claims 1 to 3 of the present invention. A painted building board of this embodiment has an MDF board 2 interposed on the surface of a base material plywood 1. Then, the thin wooden veneer 3 is adhered, a decorative coating layer 4 is formed on the surface of the thin wooden veneer 3, and the edge 5 of the decorative coating layer 4 is MDF.
It extends so as to cover the end face of the board 2.

In this case, the edge 5 of the decorative coating layer 4 is extended to reach the end face of the base material plywood 1. Further, a chamfered portion 6 is formed at the front side corner from the thin wooden veneer 3 to the MDF board 2, and the edge 5 of the decorative coating layer 4 is extended so as to cover the chamfered portion 6. .

The base material plywood 1 is a plurality of layers of wood plywood, and the fiber direction of each layer is alternately orthogonal. The overall thickness of the base material plywood 1 is 7 to 8 mm, and each layer is formed to have the same thickness. The base material plywood 1 may be provided with a plurality of cut grooves on its back surface to impart flexibility, thereby improving soundproofing.

The MDF board 2 is a medium-density wood fiber board having a thickness of 1 to 5 mm, and is adhered to the surface of the base plywood 1 via an adhesive. The MDF board 2 can also be provided with a plurality of kerfs on its back surface to provide flexibility, thereby further improving soundproofing.

The thin wooden veneer 3 is a natural or artificial veneer having a thickness of 0.1 to 1.0 mm and is adhered to the surface of the MDF board 2 via an adhesive. For example, a urethane-based transparent paint is applied to the surface of the thin wooden veneer 3 by a sponge roll coater or a spray coater, and a decorative coating layer 4 is formed. At that time, the decorative coating layer 4
Is applied so as to cover the edge 5 of the base material plywood 1.

In this case, the surface of the thin wooden veneer 3 may be subjected to a base treatment such as coloring or polishing and then applied to form the decorative coating layer 4. Also, wooden thin veneer 3
To the MDF board 2 and the chamfer 6
Is formed, and is coated so as to cover the chamfered portion 6. The coating conditions such as the coating amount and the coating speed are set so that the coating thickness of the decorative coating layer 4 is 0.1 to 1.0 mm.

Therefore, in the painted building board of this embodiment, the thin wooden veneer 3 is adhered to the surface of the base material plywood 1 via the MDF board 2, and the decorative coating film is applied to the surface of the wooden thin veneer 3. Since the layer 4 is formed, the surface hardness of the MDF board 2 is high, and the decorative coating layer 4 formed on the surface of the thin wooden veneer 3 is hardly cracked, and has impact resistance and load resistance. Is obtained, and is optimal as a floor material.

Moreover, the edge 5 of the decorative coating layer 4 is
Since it is extended so as to cover the end face of the board 2,
The MDF board 2 is prevented from absorbing moisture from its end face and is less likely to expand and contract, causing cracks on the end face and thin wood veneer 3.
Of the decorative coating layer 4 is also covered with the peripheral edge 5 of the decorative coating layer 4, so that the appearance of the finished paint is good.

Further, in the painted building board of this embodiment, the edge 5 of the decorative coating layer 4 covering the end face of the MDF board 2 is coated so as to reach the end face of the base material plywood 1. , The end faces of the MDF board 2 are completely covered and hermetically closed, and the respective end faces of the thin wooden veneer 3, the MDF board 2 and the base material plywood 1 are connected to each other at the edge 5 of the decorative coating layer 4. As a result, peeling of the thin wooden veneer 3 is reliably prevented.

Further, in the painted building board of the embodiment,
Since the edge portion 5 of the decorative coating layer 4 is painted so as to extend along the chamfered portion 6, the bending angle of the edge portion 5 of the decorative coating layer 4 is reduced, and the front side edge is reduced. The cracking of the edge portion 5 of the decorative coating film layer 4 is reliably prevented.

[0019]

As described above, in the painted building board according to the first aspect of the present invention, the decorative coating layer on the surface is hardly cracked, and the floor can be provided with impact resistance and load resistance. It is optimal as a material, and furthermore, the MDF board is less likely to be deformed by expansion and contraction, cracking at the end face thereof and peeling of the thin wood veneer are prevented, and the appearance of the finished paint becomes good.

In the painted building board according to the second aspect of the present invention, particularly, the edge of the decorative coating layer extends to the edge of the base material plywood, and the edge of the MDF board is sealed. The end faces of the thin wooden veneer, the MDF board, and the base material plywood are also connected to each other at the edge of the decorative coating layer, and the peeling of the thin wooden veneer is reliably prevented.

In the painted building board according to the third aspect of the present invention, particularly, the bending angle of the edge of the decorative coating layer along the chamfered portion is reduced, and the decorative coating at the front side corner is particularly reduced. Cracks at the edges of the layer are reliably prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of a painted building board according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing a painted building board as a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base material plywood 2 MDF board 3 thin wood veneer 4 decorative coating layer 5 edge 6 chamfer

Claims (3)

[Claims] 1. A thin wooden veneer is adhered to the surface of a base material plywood with an MDF board interposed therebetween, and a decorative coating layer is formed on the surface of the thin wooden veneer. A painted building board whose edge extends so as to cover the end face of the MDF board. 2. The painted building board according to claim 1, wherein an edge portion of the decorative coating layer is extended to reach an end face of the base material plywood. 3. The method according to claim 1, wherein a chamfered portion is formed on a front side edge of the thin wood veneer to the MDF board, and an edge portion of the decorative coating layer is extended so as to cover the chamfered portion. Item 6. The painted building board according to item 1 or 2.