JP2592976Y2 - Floor material - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor material.

[0002]

2. Description of the Related Art As a base material for a U.S.A. and a flooring material, a flooring material in which a plywood, a veneer laminate (LVI) is used as a substrate, and a decorative sheet such as a veneer is adhered to the surface thereof is known. ing.

[0003]

[Problem to be solved by the invention] However, since this substrate has a low surface hardness, when walking with high heels, etc.,
The heel portion was easily dented due to local overload, and satisfactory performance could not be obtained even in a caster test or the like.

[0004] Further, in order to form a substrate by laminating wooden veneers having a certain fiber direction, when a fruit is to be formed on the side surface, a male fruit is formed on either the longitudinal side or the lateral side. The fiber direction of the veneer located on the front and back surfaces and the inner surface of the female nut always has a portion that is orthogonal to the cutting direction for forming the fruit, and the fibers on the front surface are cut apart by cutting, resulting in a smooth surface. It was not possible to obtain the male and female front and back surfaces and the female internal surface, and it was not possible to increase the actual cutting accuracy. For this reason, rattling may occur during actual fitting.

Further, when a plywood laminated with the fiber directions of the veneers orthogonal to each other is used as a substrate and a decorative veneer is adhered to the surface thereof, generally, the fibers of the veneer located on the front and back surfaces of the plywood are generally used. Use the direction parallel to the length of the flooring,
The decorative veneer to be stuck to the surface is also stuck so that the grain is parallel to the length direction, that is, the fiber direction is parallel to the length direction due to the problem of design.

[0006] In such a flooring, since the contraction and expansion due to the absorption and release of moisture for a long period differ between the substrate and the decorative veneer, the decorative veneer is liable to dry crack, and particularly as a flooring for a heating floor. When it is used, the shrinkage becomes large due to the heating and drying of the substrate, and there is a problem that a large amount of dry cracks are generated.

[0007] Furthermore, since these substrates are manufactured by laminating and bonding only single veneers obtained by stripping natural wood thinly, the problem of depletion of natural resources is widely taken up worldwide, and it is difficult to cut down raw wood as a raw material. In addition, when the quality of the raw wood deteriorates, it becomes difficult to obtain a large number of high quality veneers to be used as veneers, and it becomes difficult to supply a large quantity of high quality substrates to the market. This problem is expected to become more serious in the future, and it is eager to provide a substitute for flooring substrates.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been accomplished as a result of devise for the purpose of providing a new flooring material which can be used as a substitute for a substrate made of a single plate.

That is, according to the present invention, at least one hard portion of a wood fiber board having a hard portion having a higher specific gravity than the center layer in the thickness direction formed on the front and back surfaces is exposed on the surface, and the side surface is subjected to actual processing. Flooring It is preferable that a decorative layer is formed on the surface of the flooring material.

[0010]

[Function] Since a hard portion having a high specific gravity and a smooth surface is exposed on the surface of the flooring material, the surface hardness is 2 times higher than that of a single-layer laminated substrate.
Up to 4 times, caster test performance 7 times, dry cracking resistance 1
Excellent surface performance as a floor material such as 0 times or more is exhibited.

[0011]

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 a longitudinal sectional view of the flooring of the present invention. As shown in FIG. 1, the flooring material of the present invention is made of a wood fiber board obtained by integral molding having hard portions 11 and 12 on the front and back, and a central portion 13 formed therebetween.

Hard portions 11 and 12 of the wood fiber board 1
Has a specific gravity in the range of 0.8 to 1.4 g / cm ^{3 on} average, and a specific gravity of the central portion 13 between 0.4 and 0.7 g / cm ^3.
In the range of 5 g / cm ^3, it rigid portion 11 Oyopi 12 at least 0.1 g / cm ³ or more preferably than the specific gravity of the center 13 having a difference in specific gravity between 0.2 to 0.8 g / cm ³ Is preferred.

When the thickness is below this range, sufficient bending strength,
No deflection is obtained, resulting in a heavy plate material, which makes it difficult to handle at the construction site, which is not preferable.

The average specific gravity of the whole wood fiber board can be 0.4 to 1.0 g / cm ³ . If the specific gravity is less than 0.4 g / cm ³ , the strength as a substrate is insufficient, and it cannot be used as a floor material. On the other hand, if it is larger than 1.0 g / cm ³ , the weight of the flooring material becomes large, which makes it difficult to handle during construction and makes nailing difficult, which is not preferable. FIG. 1 shows an example in which a hard part on both the front and back sides is exposed.

The hard portions 11 and 12 having a higher specific gravity than the central portion and having excellent tensile strength and compressive strength.
By using the wood fiber board 1 provided on the front and back layers as a substrate, the board has a high surface hardness, is hardly scratched, has excellent bending strength as a whole board, and has a very small amount of deflection under a unit load.

The hard portions 11 and 12 are used to increase the water content of the front and back wood fibers during heating and pressing in the process of manufacturing the wood fiber board by the dry method, or to add an adhesive to the wood fibers. By increasing the amount, a layer having a higher specific gravity can be locally formed as compared with other portions. Such a wood fiber board has excellent stability in that the dimensional change rate per 1% of the water content is equal in the length direction and the width direction and is 0.03 to 0.04%.

Further, by exposing at least the hard part, which is the highest specific gravity part on the surface side, the surface performance of the substrate is ten times or more as high as that when plywood is used as the substrate, and the surface hardness is higher. Has a strength that is 2 to 4 times as high as that of a flooring material, and exhibits excellent characteristics such as not being easily dented by a local impact applied from the surface.

Furthermore, when the actual processing is performed on the side surface of the flooring material of the present invention, since the fiber direction of the wood fiber of the substrate does not exist, no matter where the fruit is formed, the front and back surfaces of the male fruit S1 and the female fruit are formed. The inner surface of S2 is formed smoothly, and the accuracy of the thickness of the male S1 can be improved. Therefore, the actual S1 and the actual S2 can be securely fitted.

Further, as shown in FIG. 2, a decorative layer 2 can be formed on the surface of a floor material having such a wood fiber board as a substrate for the purpose of improving design and abrasion resistance. .
The decorative layer 2 may be a natural veneer obtained by cutting natural wood, an artificial veneer, a veneer sheet lined with a nonwoven fabric, paper, a synthetic resin sheet, or a decorative paper, an impregnated paper, a nonwoven fabric, a synthetic resin sheet, or the like. The sheet is formed by bonding with an adhesive.

At this time, since the hard portion 11 is exposed on the surface of the wood fiber board to which the decorative layer 2 is adhered, the shrinkage and expansion due to the absorption and release of moisture are uniformly reduced in the length and width directions of the substrate. Also, since it has excellent resistance to dry cracking, it is possible to prevent cracks in the veneer when a decorative layer, particularly a natural veneer, is bonded due to shrinkage and expansion.

Further, an overcoat layer can be provided on the surface of the decorative layer 2. By adding an abrasive to the overcoat layer, the wear resistance of the surface can be improved.
Further, a groove may be formed on the surface of the decorative layer 2 according to the switching of the decorative layer 3 as necessary. The groove is U groove, V groove,
The cross-sectional shape such as a semi-circular groove is provided in an arbitrary shape.

Further, a low specific gravity thin surface layer is formed on the upper surface of the hard portion in the process of manufacturing the wood fiber board. On the front side, this low specific gravity thin surface layer is polished to form a decorative layer in a state where the hard portion is exposed, but if the low specific gravity thin surface layer still remains on the rear surface side outermost layer, a long term When viewed, the moisture content of the low specific gravity thin surface layer may change due to the change in humidity.

Further, the shrinkage and expansion in the thin surface layer caused by the change in the water content may cause the substrate to warp. For this reason, by polishing the low specific gravity thin surface layer on the back side and exposing the hard part on the back side, the characteristic that the specific gravity of the hard part is high and the water permeability is excellent is also affected by the change in humidity on the back side. It can be adjusted so as to maintain a constant moisture content without causing a warp due to a change in humidity.

Further, it is preferable to use a wood fiber board containing 2% by weight or more of the size material in the hard portions 11 and 12 on the front and back sides, thereby further improving the water impermeability and preventing warpage due to a change in humidity. .

The wood fiber used as a raw material of the wood fiber board 1 used as the substrate of the present invention is a softwood such as pine, cedar, cypress or a hardwood such as lauan, kapole, chestnut, poplar or the like. Use wood fibers obtained by defibrating wood chips obtained by cutting off parts or waste materials that cannot be used as waste, and waste materials such as sander dust, saw dust, chip dust, etc. generated during the manufacture of wood fiber board. Can be.

The wood fiber board used as the substrate of the present invention is:
For example, in the process of manufacturing a dry wood fiber board, a wood fiber that has been defibrated and added with an adhesive and dried is deposited on a screen conveyor by a forming device, and each thickness is adjusted by a shaving rotor, and then temporarily pressed, and then temporarily pressed. A wood fiber mat is obtained, and then the fixed size mat cut to a certain size is heated and pressed to obtain a wood fiber board having a hard portion having a higher specific gravity on the front and back than at the center.
In the obtained wood fiber board, since the low specific gravity thin surface layer is formed by the pre-curing of the adhesive at the time of heating and pressing, the low specific gravity thin surface layer can be removed by sanding to expose the hard portion. .

A nonwoven fabric coated or contained with water on the upper and lower surfaces of the fixed-size mat obtained in the same manner as above.
By placing a water-retaining sheet-like material such as paper or cloth and heating and pressing it, the water applied or contained in the sheet-like material is heated and pressed while being held in the wood fibers of the front and back layers. A hard part having a very high specific gravity can be formed on the front and back surfaces.

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 portion 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 wood fibers forming the central part, and adding 10 to 30% by weight of the adhesive to the wood fibers forming the surface layer and the back layer. By heating and pressing later, the specific gravity of the hard portion can be increased and the strength can be improved in accordance with the above-described method of forming the hard portion 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 the wood fibers, the contents of the surface layer and the back layer can be adjusted to 2% by weight or more by heating and pressing. In this way, a hard portion having a higher specific gravity and higher water impermeability than the central portion is formed on the front and back surfaces of the wood fiber board.

Further, since the specific gravity distribution occurs even in the hard portion of the obtained wood fiber board, sanding is performed as necessary, and the layer (surface) having a particularly high specific gravity in the hard portion is exposed to the surface. Performances such as water permeability, bending strength, and deflection are further improved.

[0031]

[Effect of the Invention] The flooring material of the present invention uses a wood fiber board obtained by heating and pressing wood fibers as a substrate, and this wood fiber layer crushes or defibrates raw wood with defects that cannot be used as a single board. Since it can be obtained by using what is done, resources can be used effectively and it can help to prevent the destruction of nature.

Further, by using as a substrate a wood fiber board in which hard portions having higher specific gravity and higher tensile strength and compressive strength than the central portion are disposed on the front and back sides, at least the hard portions on the front surface side are exposed, so that The surface performance is 10 times or more the resistance to cracking and the surface hardness is 2 times as compared with the substrate laminated with a single plate.
It has a strength of up to 4 times, and exhibits excellent properties such as not being easily dented even by a local impact applied from the surface when used as a flooring material.

Further, when the actual processing is performed on the side surface of the flooring material of the present invention, since the fiber direction of the wood fiber of the substrate does not exist, the front and back surfaces and the inner surface of the fruit are smooth regardless of where the fruit is formed. It is formed and the actual cutting accuracy can be increased.

Furthermore, in the flooring material of the present invention, when a decorative layer is formed on the surface, the water impermeability on the front side is improved, but the hard part on the back side is also exposed, thereby increasing the specific gravity of the hard part. Due to the property of excellent water impermeability, it can be adjusted to maintain a constant moisture content on both the front side and the back side without being affected by changes in humidity, preventing warpage due to changes in humidity be able to.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a floor material according to the present invention;

FIG. 2 is a longitudinal sectional view of a floor material provided with a decorative layer 2,

[Explanation of symbols]

1: wood fiber board, 11, 12: hard part, 13: central part,
2: cosmetic layer, S1: male fruit, S2: female fruit.

Claims (2)

(57) [Scope of request for utility model registration] 1. A floor in which at least one hard portion of a wood fiber board in which a hard portion having a higher specific gravity than a central portion in a thickness direction is formed on the front and back sides is exposed on a surface, and a side surface is subjected to actual processing. Wood. 2. The flooring material according to claim 1, wherein a decorative layer is formed on a surface of the exposed hard part of the flooring material.