JPH07119359A - Composite panel - Google Patents

Abstract

PURPOSE:To increase workability and retaining force on attaching metal fittings or a composite panel for sticking panels, by using a hard wooden fiber plate at the front and rear sides as a sash material and arranging the hard layer at the front and rear sides of the frame body. CONSTITUTION:A panel is stuck at the front and rear sides assembled by sash bars as a frame work and hard layers are provided at the front and rear faces by use of wooden fiber plates as a sash material. In this case, the hard layer is made higher in the specific gravity, the tensile strength, and compressive strength, and lighter and also larger in the bending strength, and further, smaller in the deflection against the load, compared with the central layer. Dryed wooden fiber is piled on a screen conveyor for instance and temporarily compressed to form a wooden fiber mat and then it is compressed with heat. Next, by sanding, the low specific gravity thin surface is removed and the hard layer exposed thereon is cut in an optional width and further assembled with sash bars to obtain a frame body. And decorative materials like decorative paper or decorative veneers are stuck on both faces of the frame body by the use of composite materials plywood, plaster boards, etc.

Description

Detailed Description of the Invention

[0001]

[Industrial application] The present invention relates to a composite panel used for building wall materials, furniture, fittings, and the like.

[0002]

2. Description of the Related Art Conventionally, a bar assembly made of plywood, laminated veneer lumber, sawn wood, wood shavings (particle board, flake board, strand board, OSB, etc.) is used as a crosspiece for core assembly. Then, a frame body was obtained, and face materials were attached to the front and back of the frame body to form a composite panel. By the way, in recent years, while the problem of resource depletion including South Sea wood and the problem of environmental protection have been highlighted, wood fiber boards using wood fibers obtained from scrap wood and waste wood have attracted attention, and wood fiber boards Composite panels are provided for use as cross members.

However, since the wood fiberboard is homogeneous, it is good for warping and twisting of the panel, but
Since the wood fiber is hardened with an adhesive, the holding force for nails, screws, etc. is low, so the wood fiber board is used with a high specific gravity. Therefore, there remains a problem that the weight of the composite panel cannot be reduced.

[0004]

[Technical Means] In a composite panel in which face materials are attached to the front and back surfaces of a frame body assembled by a crosspiece, a wood fiber board having hard layers on the front and back surfaces is used as the crosspiece, and A composite panel in which the hard layers of wood fiberboard are cored together so that they are the front and back of the frame.

[0005]

[Description of Configuration] The configuration of the present invention will be described below.
As the crosspiece, a bar material obtained by cutting a wood fiber board having hard layers on the front and back surfaces into an arbitrary width is used. The wood fiberboard is preferably a medium-density fiberboard having a hard layer on the front and back surfaces and a center layer disposed between the hard layers and having a specific gravity of 0.4 to 0.8. Also,
The front and back portions have a specific gravity of 0.8 to 1.4, preferably 1.0 to 1.2, and each layer is formed to have a layer thickness of 0.3 to 3 mm, preferably 0.5 to 2 mm. The specific gravity of the central layer is 0.4 to 0.75, preferably 0.6 to 0.7.

The specific gravity of the hard layer differs from that of the central layer by at least 0.1, and more preferably by 0.3 or more. In this way, the specific gravity is higher than that of the central layer, and the hard layers having excellent tensile strength and compressive strength are arranged on the front and back portions, so that they are lightweight, have a large bending strength, and have a small amount of change in deflection with respect to load. Composed.

If the hard layer has a layer thickness of less than 0.3 mm,
If the specific gravity is less than 0.8, the pull-out resistance when driving a nail, a screw, or the like is small, the holding force becomes insufficient, and there is a drawback that it is easy to pull out.

On the contrary, the layer thickness exceeds 3 mm and the specific gravity is 1.4.
If it exceeds the range, it becomes too hard and it is difficult to drive nails, screws, etc. Regarding the specific gravity of the central layer, if the specific gravity is less than 0.4, the strength of the crosspiece becomes insufficient, and conversely, if it exceeds 0.75, the total weight of the composite panel becomes large and the handling becomes inconvenient.

Regarding the difference in specific gravity between the hard layer and the central layer,
If it is less than 0.1, sufficient flexural strength and bending cannot be obtained unless the thickness is made as large as the layer thickness of the hard layer, resulting in a large weight, which makes the composite panel large in total weight and inconvenient to handle. Cause

On the contrary, if there is a difference in specific gravity larger than 0.8,
A large difference occurs in the physical properties of the hard layer and the central layer.
That is, for example, for a bending load, a compressive force acts on the load side and a tensile force acts on the opposite load side, but in the hard layer, the specific gravity is large and the wood fibers are dense, so in the inner surface direction It is difficult for compression and tensile deformation to occur.

On the other hand, since the center layer has a small specific gravity and the wood fibers are sparse, the compression and tensile deformation are likely to occur. When the physical properties are significantly different,
It is not preferable because delamination easily occurs between the hard layer and the center layer.

Such a wood fiber board is defibrated and added with an adhesive or the like in a manufacturing process of the wood fiber board by a dry method, and the dried wood fiber is deposited on a screen conveyer by a forming device. The wood fiber mat is temporarily pressed to obtain a wood fiber mat, which is then cut into a predetermined size to obtain a standard length wood fiber mat, which is then heat pressed. In the above manufacturing process, if the amount of the adhesive added to the wood fiber is increased, the hard layer is formed to have a larger thickness.

Further, water is applied to the upper surface or the lower surface of the standard length wood fiber mat, or a water-retaining sheet-like material such as a non-woven fabric, paper or cloth is hydrated to obtain the upper surface or the lower surface of the wood fiber mat. When it is placed on a substrate and heated in this state, it is heated and clamped in a state where the water content of the front and back portions is increased, so that the layer thickness of the hard layer increases. In this way, the layer thickness of the hard layer in the wood fiberboard can be adjusted.

In the obtained wood fiber board, a low specific gravity thin surface layer is formed by precure of the adhesive at the time of heat pressing,
The low specific gravity thin surface layer is removed by sanding to expose the hard layer. Next, the wood fiberboard having hard layers on the front and back surfaces is cut into an arbitrary width, and the rod-shaped crosspiece is used for core assembly to form a frame.

Further, a bar-shaped crosspiece obtained by cutting a wood fiberboard having a plurality of wood fiberboards having hard layers on the front and back surfaces and adhering the wood fiberboard to an arbitrary width may be used. At this time, the crosspieces are cored so that the hard layers of the wood fiberboard are the front and back of the frame. As the core assembly, the crosspiece may be formed in a usual shape such as a square shape, a day shape, an eye shape, and a square shape.

Finally, face materials are attached to both surfaces of the frame to obtain a desired composite panel. The surface material is plywood, wood fiber board, wood shaving board (particle board, strand board, flake board, OSB, etc.) laminated wood, veneer laminated board, gypsum board,
Calcium silicate plate, etc., or any of these composite materials, and its surface is decorative paper, decorative resin-impregnated paper, decorative synthetic resin sheet, decorative veneer (slice veneer, rotary veneer, half-land veneer, thorn veneer , Artificial veneer, etc.) is attached.

If necessary, the composite panel may be chamfered, curved, or have a decorative material attached thereto, or pattern printed, or may be subjected to a mouth treatment by color coating. When attaching the face material with the decorative material attached to the frame, V on the back side
It may be cut and combed to wind and stick the wood mouth part.

After a plywood, a wood fiber board, a wood shaving board (particle board, strand board, flake board, OSB, etc.) is pasted as a face material, the surface of the face material or the surface of the face material is wound so as to include the mouth part of the panel. A decorative material may be attached so as to be embedded, and when the cosmetic material is attached only to the surface, the decorative material may be attached to the mouth end portion or a mouth end treatment by color coating may be applied as necessary.

In this way, the wood fiberboard having hard layers on the front and back surfaces is used as the crosspiece, and the hard layers of the wood fiber board are attached to the front and back surfaces of the frame body so that the hard layers become the front and back surfaces of the frame body. A composite panel having the face material attached was obtained.

[0020]

EFFECTS OF THE INVENTION Since a wooden fiber board having hard layers on the front and back surfaces is used as a crosspiece, pull-out resistance is large when nails, screws, etc. are driven in from the front and back surfaces, and a sufficient holding force can be obtained. Further, a core is assembled so that the hard layers on the front and back sides become the front and back of the frame, and the frame is attached, so that metal fittings and the like can be favorably attached to the composite panel in order to attach the face material.

For example, when a composite panel is used as a furniture door body, and a metal member such as a slide hinge, an angle or a hinge is screwed to a face material surface of the door body, a hard layer of a wood fiber board whose screw is a crosspiece is used. Since it penetrates and is driven in, sufficient holding force was obtained and durability was improved.

Claims (1)

[Claims] 1. A composite panel in which face materials are attached to the front and back surfaces of a frame body assembled by a crosspiece, and a wood fiberboard having hard layers on the front and back surfaces is used as the crosspiece, and the wood material is used. A composite panel in which a hard layer of a fiberboard is core-assembled so as to be the front and back of a frame.