JP2569283Y2 - Construction materials - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building material used as a peripheral edge of a house, a handrail of a stair, a skirting board or the like.

[0002]

2. Description of the Related Art Medium specific gravity fiberboard has a specific gravity of 0.4 to 0.8.
Because it is relatively lightweight, it has excellent strength properties and good workability, it is possible to apply optional makeup to the surface as necessary, and to make wall materials, floor materials, fittings, construction materials, furniture Widely used for various applications such as members.

In the case of the medium specific gravity fiberboard, for example, when a dry method is used, an adhesive is applied to wood fibers obtained by defibrating wood, and this is formed and temporarily pressed to form a fiber mat.
This fiber mat is obtained by cutting the fiber mat into a fixed size to form a fixed size mat, and then heating and pressing.

[0004]

Although the medium specific gravity fiberboard generally has satisfactory overall performance as described above, it is desired to further improve various physical properties while maintaining its light weight. I have.

[0005] In particular, when used as a construction material such as a handrail of a surrounding edge or a staircase, a load from the side is also received, but a larger load is received from above. It is desired to provide such strength characteristics as minimizing.

Further, since the medium specific gravity fiber board is relatively soft, it has a drawback that expansion and contraction are likely to occur due to a change in water content. Therefore, it is desired to suppress this and improve dimensional stability.

[0007] Hard fiber boards, generally called hard boards, are widely industrially produced, are high specific gravity fiber boards having a specific gravity of 0.8 or more, and are excellent in bending strength and dimensional stability. Light weight is impaired, and there is a problem in workability and handling.

[0008]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a novel material which is suitably used for a building material, in particular, by strengthening its physical properties while using a medium-density fiberboard as a base material. And

That is, the construction material according to the present invention is based on a medium-density fiberboard having at least one hard layer having a high specific gravity at the front and back and inside thereof, and a decorative sheet is attached to the surface of the substrate. Wherein the hard layer of the medium specific gravity fiberboard is used in a vertical direction.

[0010] The medium specific gravity fiberboard as the base material of the construction material of the present invention has an overall specific gravity of 0.4 to 0.8, but at least one layer on the front and back and inside, a hard layer having a higher specific gravity than other parts, Preferably, a hard layer having a specific gravity of 0.8 to 1.4 is provided.

It is preferable that the inner hard layer has a greater thickness than the hard layers on the front and back sides.

A plurality of internal hard layers can be provided as necessary.

A non-permeable layer made of synthetic resin or the like can be formed on the surface of the plate, if necessary.

[0014]

[Function] Since the substrate is made of a medium-density fiberboard having a specific gravity of 0.4 to 0.8, it is lightweight and has excellent workability and handleability.

The base material is reinforced by a hard layer having a specific gravity of 0.8 to 1.4 on the front and back sides and inside, and dimensional stability is improved.

Since the hard layer is used as a construction material so as to be in the vertical direction, the bending strength against a load from the side is improved by the front and back hard layers, and the plurality of hard layers extending in the vertical direction increases from above. The bending strength with respect to the load is significantly improved.

[0017]

FIG. 1 shows an embodiment of the present invention, in which a working material 1 is used as a peripheral edge for supporting a ceiling plate around four circumferences of a ceiling. This peripheral edge 1 is provided on the surface of a base material 2 made of a medium-density fiberboard having each of hard layers of a front hard layer 3, a back hard layer 4, and two internal hard layers 5, which are provided as two layers. The state object 6 is stuck.

The front hard layer 3 and the back hard layer 4 are preferably exposed on the front and back surfaces of the substrate 2 as shown.

The overall specific gravity of the medium specific gravity fiberboard is 0.4 to 0.8.
Where each hard layer has a specific gravity of 0.8 to 1.4.

As described above, in the medium specific gravity fiberboard, a hard layer having a high specific gravity and excellent in tensile strength and compressive strength is formed on the front and back portions and inside of the board, so that the bending strength is large while being lightweight. The amount of deflection change with respect to load is small.

That is, against the load received from the side, the compressive strength of the hard layer on the working surface side and the tensile strength of the hard layer on the opposite side combine to exhibit excellent bending strength, and With respect to the load received from above when used as the above, the plurality of hard layers 3, 4, 5 extending in the vertical direction exhibit extremely excellent bending strength. The strength characteristics against a load from above can be further improved by providing a large number of internal hard layers 5.

The thickness of each hard layer is generally 0.3 to 5 mm.
By making it larger, the strength physical properties of the base material 2 are further improved.

By forming the hard layers 3 and 4 having high specific gravity and impermeable to water on the front and back portions of the base material 2, absorption of water from the front and back surfaces is substantially prevented. In addition, since the inner hard layers 5 and 5 function like a reinforcing bar, the occurrence of expansion and contraction due to a change in water content is suppressed. As a result, a plate having extremely excellent dimensional stability can be obtained.

The substrate 2 having such a configuration can be manufactured as follows.

That is, in general, a medium-density fiberboard is prepared by, for example, adding an adhesive and the like in a manufacturing process of a wood fiberboard by a dry method, depositing the dried woodfiber on a screen conveyor by a forming apparatus, The wood fiber mat is temporarily pressed to obtain a wood fiber mat, which is then cut to a fixed size to obtain a fixed-length wood fiber mat, which is obtained by heating and pressing the wood fiber mat. By increasing the amount of the adhesive to be added or increasing the water content of the wood fiber, the thickness of the hard layer on the front and back sides is increased. In addition, water is applied to the upper or lower surface of the fixed-length wood fiber mat, or a water-retainable sheet such as nonwoven fabric, paper, or cloth is placed on the upper or lower surface of the wood fiber mat. When heating is performed in this state, the heating and pressing are performed in a state where the water content of the front and back portions is increased, so that the thickness of the hard layer increases. In this way, a medium-density fiberboard having a hard layer having a predetermined thickness on the front and back sides is obtained.

In the obtained medium specific gravity fiberboard, a low specific gravity thin surface layer is formed by pre-curing the adhesive at the time of heating and pressing, and if necessary, sanding is performed to remove the low specific gravity thin surface layer. The layer is exposed on both sides.

The medium-density fiberboards thus obtained are laminated with an adhesive, and two sheets are bonded together by press-bonding to obtain a medium-density fiberboard having a hard layer on each of the front and back portions and inside. Is cut into a predetermined shape to be used as the base material 2 in the working material of the present invention.

In the substrate obtained by the above method,
Since the inner hard layer is formed as a composite of the laminated back hard layer of the upper middle specific gravity fiber board and the front hard layer of the lower middle specific gravity fiber board, the inner hard layer is more rigid than the front and back hard layers of the plate material. Inevitably, the layer thickness is increased, and a material having favorable strength is obtained.

As in the embodiment shown in FIG. 1, the base material 2 having a plurality of internal hard layers 5 and 5 comprises a plurality of medium-density fiberboards having hard layers on the front and back manufactured by the method described above. In the embodiment, three sheets can be manufactured by laminating and bonding them, and cutting them into a predetermined shape.

An arbitrary decorative sheet material 6 is stuck on the surface of the base material 2 thus obtained, and the work material 1 according to the present invention is provided.
Is obtained.

As the decorative sheet 5, a natural wood veneer obtained by cutting natural wood to a thickness of about 0.2 to 3 mm,
Artificial veneer, nonwoven, any paper, synthetic resin sheet veneer sheet lined with sheet material, 20 to 40 g / ^{m 2} of decorative paper, nonwoven 32~500g / ^{m 2,} in parchment paper or the like of 50 g / ^{m 2} Printed with a pattern or painted with a single color. After sticking to the base material 4, these decorative sheet-like materials 5 can be subjected to an optional overcoating.

The sticking of the decorative sheet material 5 to the surface of the base material 4 is performed, for example, by applying a thermoplastic adhesive such as a vinyl acetate resin,
In order to improve water resistance, it can be carried out using a material in which a thermosetting resin or urea powder is mixed. Decorative sheet material 5
Is adhered onto the substrate 4 made of a medium-density fiberboard having a small coefficient of contraction and expansion due to moisture absorption and desorption, so that even if a veneer is used as the decorative sheet material 5, the veneer is less likely to crack.

FIG. 2 shows another embodiment of the present invention used as a handrail of a staircase.

FIG. 3 shows still another embodiment of the present invention used as a skirting board.

[0035]

[Effects of the Invention] The medium specific gravity fiberboard in which a hard layer having a high specific gravity is arranged on each of the front and back and inside is used as a base material for the construction material, so that it is lightweight, yet has dimensional stability and strength characteristics. An excellent plate material is provided.

The hard layer is used as a construction material so as to be in the vertical direction, and has excellent bending strength to withstand loads from above and from the sides.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a surrounding edge which is a construction material according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a stair railing as a construction material according to another embodiment of the present invention.

FIG. 3 is a perspective view showing a configuration of a baseboard as a construction material according to still another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 construction material 2 base material 3 front hard layer 4 back hard layer 5 inner hard layer 6 decorative sheet

Claims (1)

(57) [Scope of request for utility model registration] Claims 1. A medium-density fiberboard having at least one hard layer having a high specific gravity on the front and back and inside thereof, and a decorative sheet-like material adhered to the surface of the substrate,
A construction material characterized in that the hard layer of the medium specific gravity fiberboard is used so as to be vertical.