JP2584044Y2 - Up frame material - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upward frame material.

[0002]

2. Description of the Related Art A medium-density fiberboard has a specific gravity of 0.4 to 0.8 and is relatively lightweight, yet has excellent strength performance and good workability. It is used for various purposes such as wall materials, floor materials, fittings, building materials, furniture members, etc., by applying makeup.

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]

The medium specific gravity fiberboard has almost satisfactory performance as described above, but it is desired to further improve various physical properties while maintaining its light weight. Especially when used as an upward frame, a load is applied from the surface side by a person who steps on the surface every day,
Further, when the furniture and the like are taken in and out, since the up frame material is one step higher than the entrance floor, corners of furniture and the like are easily hit on the side surfaces of the up frame material, and dents and scratches are easily made. For this reason, it is desired that the ascending frame material has a small amount of change in deflection with respect to the load from the front side and a high hardness of the side surface. In addition, since the medium specific gravity fiber board is relatively soft, there is a disadvantage 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.

[0005] A high specific gravity fiberboard generally called a hard board is widely industrially produced, has a specific gravity of 0.8 or more, and is excellent in bending strength and dimensional stability. The lightness is impaired, and the hardness is too high, which makes it difficult to nail, resulting in problems in workability and handling.

[0006]

SUMMARY OF THE INVENTION The present invention aims to provide a novel material which is preferably used as an ascending frame material, while strengthening its physical properties while using a medium specific gravity fiberboard as a base material. Aim. That is, in the present invention, the medium specific gravity fiberboard having at least one hard layer having a high specific gravity on the front and back and inside thereof is used as the base material 2, and the decorative layer 6 is attached to at least two orthogonal surfaces of the base material 2. The hard layers 3, 4, and 5 of the medium-density fiberboard are ascending frame materials used as a vertical direction.

The medium specific gravity fiber board serving as the base material 2 of the present invention is 0.1.
It has an overall specific gravity of 4 to 0.8, but at least one layer on the front and back and inside thereof, a hard layer having a higher specific gravity than other portions, preferably a hard layer having a specific gravity of 0.8 to 1.4 is provided. . It is preferable that the inner hard layer 5 has a larger thickness than the hard layers 3 and 4 on the front and back sides. Also, a plurality of internal hard layers 5 can be provided as needed. On the surface of the substrate 2, a water-impermeable layer made of a synthetic resin or the like can be formed as necessary.

[0008]

As described above, since the medium density fiberboard having a specific gravity of 0.4 to 0.8 is used as the base material 2, it is lightweight and excellent in workability and handleability. Specific gravity 0.8-1.
Since the substrate 2 has the hard layers 3, 4, and 5, the base material 2 is strengthened and dimensional stability is improved. Since the hard layers 3, 4, and 5 are used as the upward frame material 1 so as to be in the vertical direction, the bending strength against a load from the front side is improved by the hard layers 3 and 4 on the front and back, and the hard layers are extended in the vertical direction. The improvement of the strength is further remarkably improved by the plurality of hard layers 5.

Furthermore, the presence of the hard layers 3 and 4 on the surface results in excellent surface smoothness and a surface hardness of 2 to 4 times higher than that obtained by laminating a single plate.
4 and 5 are used as the upward frame material 1 so as to be in the vertical direction, so that one of the hard layers 3 and 4 on the surface of the base material 2 is located in front of the upward frame material 1 and receives a local impact. Even it is difficult to dent.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a floor material according to the present invention. FIG. 1 is an embodiment of the present invention, and shows an upward frame material 1. This ascending frame material is provided with a decorative layer 6 on the surface of a substrate 2 made of a medium-density fiberboard having hard layers of a front hard layer 3, a back hard layer 4, and two internal hard layers 5 and 5. Become worn.

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, but each of the hard layers 3, 4, and 5 has a specific gravity of 0.8 to 1.4. As described above, in the medium specific gravity fiberboard, since the hard layers 3, 4, and 5 having high specific gravity and excellent in tensile strength and compressive strength are formed on the front and back portions and inside of the base material 2, it is bent while being lightweight. The strength is large, and the amount of change with respect to the load is small.

That is, with respect to the load received from the side of the ascending frame 1, the compressive strength of the hard layers 3 and 4 on the working surfaces and the tensile strength of the hard layer on the opposite side show excellent bending strength. With respect to the load received from above the climbing frame 1, 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 of the hard layers 3, 4, 5 is generally 0.3
The thickness of the inner hard layers 5 and 5 is made larger than that of the front and back hard layers 3 and 4, whereby the strength properties of the substrate 2 are further improved.

Further, since the front and back hard layers 3 and 4 having high specific gravity and impermeable to water are formed on the front and back of the base material 2, the absorption of moisture from the front and back is substantially prevented. In addition, since the inner hard layers 5 and 5 work like a reinforcing bar, a plate having extremely excellent dimensional stability can be obtained.

The substrate 2 having such a configuration can be manufactured as follows. The wood fiber used as the raw material of the medium fiber board is made of softwood materials such as pine, cedar, cypress, etc., or hardwood materials such as lauan, kapole, chestnut, poplar etc. Wood chips obtained by defibrating the wood chips by an ordinary method, and waste materials such as sander dust, saw dust, chip dust and the like generated during the manufacture of the wood fiber board can be mixed and used.

In a manufacturing method of a dry wood fiber board, for example, in a manufacturing process of a dry wood fiber board, a wood fiber dried and added with an adhesive is deposited on a screen conveyor by a forming device, and the thickness is adjusted by a shaving rotor. Then, a wood fiber mat is obtained by temporary pressing, and then a fixed-size mat cut to a certain size is heated and pressed to obtain a wood fiber board having a hard layer having a higher specific gravity in the front and back layers than in the center layer. Can be

In the obtained wood fiber board, a low specific gravity thin surface layer is formed by pre-curing the adhesive at the time of heating and pressing.
Sanding removes the low-density thin film surface layer,
The hard layer can be exposed. Further, by applying a water-retaining sheet-like material such as a non-woven fabric, paper, or cloth coated with water on the upper and lower surfaces of the fixed-size mat obtained in the same manner as described above, and heating and pressing the sheet, the sheet is heated. Since the water applied to or contained in the article is heated and pressed while being held in the wood fibers of the front and back layers, a hard layer having a very high specific gravity can be formed on the front and back faces.

As a forming apparatus for depositing wood fibers on the screen conveyor, three forming machines for separately forming the back layer forming wood fibers, the center layer forming wood fibers, and the surface layer forming wood fibers and depositing them on the screen conveyor. A device was provided, for example, adding 3 to 5% by weight of an adhesive to the center layer forming wood fiber, and adding 10 to 30% by weight of an adhesive to the surface layer forming wood fiber and the back layer forming wood fiber. By heating and pressing later, the specific gravity of the hard layer can be increased and the strength can be improved in accordance with the above-described method of forming the hard layer using moisture.

In a similar forming apparatus,
2-8 as the back layer forming wood fiber and the surface layer forming wood fiber
The coating agent containing or containing the weight% sizing agent is supplied to the forming apparatus, and the back layer, the middle layer, and the surface layer
After laminating and stacking the layers of wood fibers, the content of the sizing agent in the surface layer and the back layer can be adjusted to 2% by weight or more by heating and pressing.

In this manner, the front and back surfaces of the wood fiber board are
A hard layer having higher specific gravity and higher water impermeability than the center layer is formed. In addition, since the specific gravity distribution occurs in the hard layer of the obtained medium specific gravity fiberboard, sanding is performed as necessary, and a layer (surface) having a particularly high specific gravity among the hard layers is exposed to the surface, so that the water imperviousness is obtained. , Bending strength and bending performance.

The medium-density fiberboard thus obtained is overlaid with two adhesive layers via an adhesive and bonded by pressing to obtain a medium-density fiberboard having a hard layer on each of the front and back and inside thereof. Can be used as the base material 2 of the upward frame material of the present invention by cutting it into a predetermined shape.

In the base material 2 obtained by the above method, the inner hard layer 5 is formed as a composite of the hard layers 3a and 3b on the front and back surfaces of the laminated medium specific gravity fiber boards which are in contact with each other. The layer thickness is inevitably larger than the hard layers 3 and 4 on the front and back sides of the material, and a layer having favorable strength can be obtained. As in the embodiment shown in FIG. 1, the substrate 2 having a plurality of internal hard layers 5 and 5 includes a plurality of medium-density fiberboards having the hard layers 3 and 4 on the front and back manufactured by the method described above. In this embodiment, three sheets can be manufactured by cutting them into a predetermined shape by laminating and bonding them. The optional decorative layer 6 is stuck on at least two orthogonal surfaces of the base material 2 thus obtained, and the upward frame material 1 according to the present invention is obtained.

The decorative layer 6 may be a natural veneer, an artificial veneer obtained by cutting natural wood to a thickness of about 0.2 to 3 mm, a veneer sheet lined with nonwoven fabric, paper, or a synthetic resin sheet, or 20-40 g / m ² of decorative paper,
32~500g / ^{m 2} nonwoven fabric, any pattern pattern printed or in parchment paper or the like of 50 g / ^{m 2,} which monochromatic paint is applied is exemplified. After sticking to the base material 4, these decorative sheet-like materials 5 can be subjected to an optional overcoating.

As shown in FIG. 3, a sheet-like material 6a such as a natural veneer, an artificial veneer, a veneer sheet, etc. is plywood, as shown in FIG.
The V-groove 7 is formed on the back surface of the base plate 6b by using the material adhered to the surface of the base plate 6b such as a wood fiber board as the decorative layer 6, and the V-groove portion is bent as shown in FIG. Can be adhered to two orthogonal surfaces of the base material so as to form the chamfered portion 8 on the surface of the corner.

The decorative layer 6 is adhered to the surface of the substrate 4 by mixing a thermosetting resin or a urea resin powder or the like for improving water resistance into a thermoplastic adhesive such as a vinyl acetate resin. Can be performed. Since the decorative layer 6 is adhered to the base material 4 made of a medium-density fiberboard having a small coefficient of contraction and expansion due to moisture absorption / release, even if a veneer is used as the decorative layer 6, the veneer is less likely to crack.

[0026]

[Effects of the Invention] (a) Front and back hard layers 3 and 4 are formed on the front and back surfaces of the medium-density fiberboard, and these hard layers 3 and 4 are used in the vertical direction as the up frame material 1. One of the front and back hard layers 3 and 4 is located on the side surface.
Therefore, even if furniture or the like collides with the side surface of the upward frame material 1, there is no damage.

(B) Similarly, when used as the upward frame material 1, since the front and back hard layers 3, 4 and the internal hard layer 5 support the load from the surface, the amount of deflection is significantly reduced. . The medium specific gravity fiberboard has high strength irrespective of its light weight, and the hard layers 3, 4 and 5 suppress expansion and contraction due to water content. Furthermore, nailing is easy by penetrating the hard layer because the medium density fiberboard is soft,
Stable after nailing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a frame material of the present invention;

FIG. 2 is a cross-sectional view when a chamfered portion 8 is provided,

FIG. 3 is a perspective view of the decorative layer 6 of FIG. 2 before sticking;

[Explanation of symbols]

1: Uphill frame material, 2: Base material, 3: Front surface hard layer, 4: Back surface hard layer, 5: Internal hard layer.

Claims (1)

(57) [Scope of request for utility model registration] 1. 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 layer adhered to at least two orthogonal surfaces of the substrate. Characterized in that the rigid layer of the medium specific gravity fiberboard is used in a vertical direction.