JP2002036408A - Decorative board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a decorative board which has sufficient strength, excellent dimensional stability, high water resistance and good design. SOLUTION: A decorative board is provided with a base material 1 and a fiber plate 2 laminated on the base material 1. The fiber plate 2 is produced by heat-compressing a woven fabric 6 composed of fibers having length of not less than 50 mm obtained by opening fibers of a shell skin of a plant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative board which can be used as an interior material such as a wall material or a ceiling material, or a construction member.

[0002]

2. Description of the Related Art Decorative boards used for interior materials such as wall materials and ceiling materials and construction members in the housing field are made of wooden boards such as muk boards made from raw wood logs, laminated wood, or plywood. In the past, it was mainstream.

[0003] However, in connection with recent environmental problems such as global warming and desertification, regulations on deforestation mainly in tropical rainforests have tended to be strengthened. For this reason, in place of the above-mentioned wood board materials, wood-based boards that make effective use of wood resources and decorative boards that use materials other than wood as a base material are rapidly increasing.

As such a decorative board, for example, a wooden board such as a particle board or MDF, or a board material such as a gypsum board is used as a base material, and a surface finishing material such as a veneer or a decorative sheet is adhered to the surface thereof. What was done.

[0005]

However, in response to an increase in the quality required for housing members, decorative boards based on wood-based boards and gypsum boards as described above have strength characteristics, dimensional stability and water resistance. At present, the required performance is not sufficiently satisfied in terms of properties.

That is, wood-based boards such as particle board and MDF are composed of minute woody elements such as wood chips and wood fibers having a length of less than 6 mm obtained from conifers or hardwoods. Compared to plywood etc., there is a problem that the strength against load such as bending and impact is small, and furthermore, many wooden elements constituting the wooden board swell due to moisture and moisture in the air, and the size of the entire board There is a problem that the change is large and the dimensional stability against the temperature change and humidity change in the room tends to be low, and there is a possibility that the decorative board using the wooden board as a base material may be warped or cracked. there were.

[0007] Gypsum boards, which are often used as base materials for interior materials, are inexpensive and have high dimensional stability, but have drawbacks in that strength and water resistance are extremely low.

Further, since the above-mentioned wood-based boards and gypsum boards are inferior in surface design, in order to use them as decorative boards, it is necessary to adhere a surface finishing material such as a veneer or decorative sheet to the surface. However, there is a problem that the degree of freedom in design is low.

The present invention has been made in view of the above points, and provides a decorative board having sufficient strength, excellent dimensional stability, high water resistance, and good design. The purpose is to do so.

[0010]

A decorative board according to claim 1 of the present invention is a decorative board formed by including a base material and a fiberboard attached to a surface of the base material, The fibrous board is characterized in that it is produced by hot-pressing a woven fabric made of fibers having a length of 50 mm or more obtained by defibrating a bast portion of a plant.

The invention according to claim 2 is characterized in that, in claim 1, the fiberboard is attached to both surfaces of the substrate.

A third aspect of the present invention is characterized in that, in the first or second aspect, the base material is a wood board selected from plywood, MDF, particle board, wood veneer and the like. .

According to a fourth aspect of the present invention, in the first or second aspect, the base material comprises an adhesive dispersed in a plurality of long fibers obtained from at least one of kenaf, oil palm, and coconut. It is a long-fiber plate produced by hot-pressing a long-fiber mat made of an aggregate in which directions are oriented.

According to a fifth aspect of the present invention, in the fourth aspect, the long-fiber board is formed by laminating a plurality of layers of long-fiber mats and hot-pressing the long-fiber mats. Are stacked so that their orientation directions are orthogonal to each other.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the fiberboard is formed by hot-pressing a woven fabric made of at least one fiber selected from kenaf fiber, jute fiber and sisal fiber. It is characterized by being manufactured by the method described above.

[0016]

Embodiments of the present invention will be described below.

FIG. 1 shows an example of an embodiment corresponding to the first aspect of the present invention. FIG. 1A shows a decorative board formed by attaching a fiber board 2 to the surface of a substrate 1. FIG. 1B schematically shows the appearance of A, and FIG.

First, the substrate 1 will be described. The material of the substrate 1 is not particularly limited. For example, veneers obtained from softwood or hardwood, plywood, laminated boards such as LVL, wafer boards, OSBs or particle boards And a fiberboard such as MDF. In addition, depending on the application and required performance, inorganic fiber boards such as rock wool board, or fiber reinforced boards in which these materials are combined with short fibers such as whiskers, or chemical treatments in which these materials are treated with resin or inorganic substances A plate or the like can also be used.

Next, the fiber board 2 will be described. Fiberboard 2
Is obtained by preparing a woven fabric 6 from fibers having a fiber length of 50 mm or more obtained by defibrating the bast portion of a plant, and hot-pressing the woven fabric 6. The woven fabric 6 is obtained by weaving the warp yarn 10 and the weft yarn 11 prepared from this fiber so as to cross each other in a substantially orthogonal direction. After dispersing the adhesive in the woven fabric 6, the woven fabric is hot-pressed. The fiberboard 2 can be manufactured by heating and pressing.

The woven fabric 6 can have various textures and appearances depending on the state of interlacing of the warp yarns 10 and the weft yarns 11 and the thickness of the warp yarns 10 and the weft yarns 11, for example. By alternately interlacing the warp yarns 10 and the weft yarns 11 one by one as shown in a), a plain-woven fabric 6 as shown in FIG. 2B can be obtained, and FIG.
As shown in (a), the warp 10 is alternately crossed with one weft 11 and two wefts 11 and the weft 11 is replaced with one warp 1
By alternately interlacing 0 and two warp yarns 10,
A twill-woven fabric 6 as shown in FIG. 2B can be obtained. Then, fibers obtained by defibrating the plant bast are oriented in one direction to form a bundle, and this is
Or as a weft 11 or by twisting this fiber to form a yarn.
By using and weaving as the weft 11 or the weft 11, the above-described woven fabric 6 made of plant bast fiber can be obtained.

The type of adhesive used for hot-pressing the woven fabric 6 is not particularly limited. For example, urea resin, melamine resin, phenol resin, resorcinol resin, epoxy resin, urethane resin, furfural resin resin,
A thermosetting resin which is cured by heating such as an isocyanate-based resin can be given. The method for dispersing the adhesive is not particularly limited, and examples thereof include a method of spraying the adhesive solution onto the woven fabric 6 and a method of dipping the woven fabric 6 in the adhesive solution. Further, as a pressing method at the time of hot pressing, there are a batch-type flat plate press and a continuous press, but there is no particular limitation. The press temperature, press time, press pressure, and the dispersion mass ratio of the adhesive to the woven fabric 6 during the hot pressing are determined by the type of the adhesive used,
It is appropriately set according to the thickness of the fabric 6 and the like.

Then, the fiberboard 2 produced as shown in FIG. 1B as described above is adhered to one surface of the base material 1 with an adhesive, so that a decorative material as shown in FIG. Board A can be obtained. The surface of the decorative board A thus obtained is formed of the fiberboard 2, and the fiberboard 2 can be made to have various textures and appearances as described above. Is excellent in design. Therefore, it is possible to finish as a decorative board A without attaching a surface finishing material such as a veneer or a decorative sheet, and the degree of freedom of the appearance of the decorative board A is increased, and the decorative board A can be used for interior materials and construction members. The decorative board A can be provided.

The decorative board A according to the present invention has, besides the advantages in terms of design, the fiberboard 2 constituting the decorative board A is made of fibers obtained by opening the bast of a plant. Since it is formed of the woven fabric 6, it has excellent characteristics in terms of performance.

That is, the fiber obtained from the plant bast has a tensile strength which is generally about 2 to 14 times higher than that of softwood fiber obtained from softwood or hardwood fiber obtained from hardwood. The fiberboard 2 made of the high-strength fiber fabric 6 has high strength. Moreover,
Since a fiber having a long fiber length of 50 mm or more is used as the fiber, a large number of entanglements of the fiber are present inside the fiber board 2 and the number of seams between the fibers can be reduced, and the fiber itself can be used. The fiberboard 2 having a higher strength can be obtained by effectively exerting the high strength of the fiberboard. Here, if the fiber length of the fiber constituting the woven fabric 6 is less than 50 mm, such effects cannot be sufficiently obtained. The upper limit of the fiber length is not limited, but it is difficult to obtain a fiber longer than about 4000 mm, and this is the practical upper limit. Further, as shown in FIG. 1 (b), the fiberboard 2 is formed such that the warp yarn 10 and the weft yarn 11 in which the fibers are oriented in substantially one direction are orthogonal to each other. The strength can be exhibited more effectively, and the strength of the fiberboard 2 can be further increased. Fiberboard 2 having such high strength
Is applied to the base material 1 to obtain a decorative board A having extremely excellent strength performance.

The fiber obtained from the plant bast is characterized in that the dimensional change in the fiber direction during water absorption and moisture absorption is small. The fiber board 2 composed of the warp yarns 10 and the weft yarns 11 has the fiber directions of these fibers aligned and oriented in a direction substantially orthogonal to the fiber board. Therefore, the decorative board A in which the fiber board 2 is adhered to the base material 1 can have a very small change in length in the surface direction. Further, since the fiberboard 2 made of the woven fabric 6 has a cross-sectional structure as shown in FIGS. 2A and 3B in which the warp 10 and the weft 11 are overlaid, the dimensional change is suppressed even in the thickness direction. The action works. That is, the warp yarn 10 and the weft yarn 11 act as a restricting action against a dimensional change in the thickness direction during water absorption and moisture absorption, and the dimensional change can be reduced also in the thickness direction.

By the action of the above fiberboard 2, in addition to having a high degree of freedom in design and good designability, it has excellent strength characteristics and dimensional stability, and has the disadvantages of water such as gypsum board. And a decorative board A having excellent performance in water resistance.

Here, the fiber having a length of 50 mm or more obtained by defibrating the bast of a plant is not particularly limited, but kenaf fiber, jute fiber, etc. And sisal fiber.

Kenaf is an annual of the family Malvaceae, mainly in China.
It is a plant cultivated in Southeast Asia, etc., and is easily defibrated from kenaf bast by immersion in water.
Long fibers of 0 mm or more can be obtained. Jute, also known as jute, is widely cultivated in hot and humid areas, with major production areas in Bangladesh and India. Sisal is a plant grown in tropical regions such as Central and South America, Indonesia and Africa.

Fabrics made from these fibers are processed into bags to be used as grain bags for transporting agricultural products, but after use, most of them are discarded. Therefore, by manufacturing the fiberboard 2 of the present invention using the woven fabric 6 formed from kenaf fiber, jute fiber, and sisal fiber, waste can be reduced and resources can be saved. . Accordingly, a decorative board A using a fiberboard 2 produced by hot-pressing such a woven fabric 6 of kenaf fiber, jute fiber, and sisal fiber.
Has excellent performance in strength, dimensional stability, and water resistance, and also contributes to saving of agricultural resources.

The density of the fiberboard 2 is not particularly limited, but is preferably set to 0.4 g / cm ³ or more, and more preferably 0.5 g / cm ³ or more. If the density of the fiberboard 2 is less than 0.4 g / cm ³ , there will be many voids inside the fiberboard 2, and the bonded portions of the fibers constituting the fiberboard 2 and the entangled portions of the fibers will be described. Is reduced, it is difficult to sufficiently exhibit the strength inherent in the fiber obtained from the bast portion, the strength of the fiberboard 2 is reduced, and the strength performance of the decorative board A is reduced. There is a possibility that. Although the upper limit of the density of the fiberboard 2 is not particularly set, it is practically 1.0 g / c.
m ³ is the upper limit. If the density of the fiberboard 2 is higher than this, it is necessary to perform high compression, so that the fibers are easily burned and discolored at the time of hot pressing, and the cosmetic property of the surface may be impaired.

FIG. 4 shows an embodiment of the second aspect of the present invention, in which a sandwich structure in which fiber boards 2 and 2 are adhered to both surfaces of the base material 1 with the base material 1 interposed therebetween. This is the decorative board A. By forming such a sandwich structure, the mechanical strength of both surface portions of the base material 1 can be increased, and a decorative board A having higher strength can be obtained, and the decorative board A is substantially symmetric with respect to the thickness direction. With such a structure, it is possible to suppress deformation in the thickness direction such as warpage or push-up, and to obtain a decorative board A having excellent dimensional stability performance against temperature change and humidity change. Things.

As described above, various types of substrates can be used as the base material 1. As described in the third aspect of the present invention, wood-based boards such as plywood, MDF, particle board, and wood veneer are used. More preferably, it is used. In the case of the decorative board A produced by sticking the fiberboard 2 to these wood-based boards, there is obtained an advantage that the high mechanical properties of the fiberboard 2 made of high-strength fibers can be effectively utilized. . For example, when plywood is used as the base material 1, compared to a conventional plywood with a veneer or a decorative sheet attached thereto,
Even if the thickness of the plywood is reduced, the same bending strength can be ensured, and a lightweight and low-cost decorative board A can be obtained. MDF and particle board, which had been difficult to use in terms of strength, etc., in the past, had a decorative board A
It is possible to provide a decorative board A which has both strength and lightness and is inexpensive.

As described above, by using the inexpensive and readily available wooden board as the base material 1 while taking advantage of the excellent properties of the high-strength fiber, the decorative board A having excellent cost competitiveness can be obtained. The decorative board A can be provided with handleability, workability, hardness characteristics, impact resistance, and the like.

As the base material 1, the adhesive is dispersed in the long fibers 3 obtained from kenaf, oil palm, coconut palm, etc., and the long fibers 3 are fixed in a certain direction.
Long fiber mat 4 composed of an aggregate in which the fiber directions of the fibers are oriented
And a long fiber board 5 produced by hot-pressing the long fiber mat 4 can also be used. The long fiber 3 preferably has a fiber length of 100 to 4000 mm. The type of the adhesive used in the long fiber mat 4 and the method of dispersing the adhesive in the long fiber 3 are not particularly limited. Examples of the adhesive include a urea resin, a melamine resin, and phenol. Thermosetting resins that are heat-cured such as resin-based resins, resorcinol-based resins, epoxy-based resins, urethane-based resins, furfural-based resins, and isocyanate-based resins can be given. Further, when the long fiber mat 4 is hot-pressed to produce the long fiber plate 5,
Examples of the pressing method include a batch type flat plate press and a continuous press, but are not particularly limited. The pressing temperature, pressing time, pressing pressure, the ratio of the adhesive added to the long fibers 3 and the like are appropriately set according to the type of the adhesive used, the thickness of the long fiber mat 4, and the like.

The long fiber board 5 as described above is a light-weight, high-strength, high-dimensionally stable wood board.
By sticking the above-described fiber board 2 using the substrate 1 as a base material 1, a decorative board A as shown in FIG. 5 can be obtained. The long fiber 3 obtained from kenaf, oil palm, and coconut is about 2 to 14 in comparison with the softwood fiber obtained from softwood or the hardwood fiber obtained from hardwood.
The long fiber board 5 made of the long fiber mat 4 in which the long fibers 3 are oriented has a twice as high tensile strength. It has a high surface hardness and has excellent performance against changes in length due to changes in temperature and humidity. Therefore, by adhering the fiber board 2 with the long fiber board 5 as the base material 1, the performance can be further improved, and the decorative board A thus has both the base material 1 and the fiber board 2. Because it is made of fiber with high tensile strength, it has excellent performance in strength and dimensional stability while being lighter,
The excellent design property of the fabric 6 can be effectively exhibited.

FIG. 6 shows an example of the embodiment of the invention according to claim 5, wherein the long fiber board 5 used as the base material 1 is formed by laminating a plurality of layers of long fiber mats 4 and hot pressing. It is made by doing. Each long fiber mat 4 is a long fiber 3
Are oriented in a substantially constant direction.
So that the orientation directions of the long fiber mats 4 are alternately orthogonal to each other.
Are laminated. In this way, by forming the long fiber board 5 in a structure in which the long fiber mats 4 in which the long fibers 3 are oriented in substantially the same direction and a plurality of layers are laminated with the orientation directions substantially orthogonal to each other, the in-plane direction of the long fiber board 5 Can be reduced, and the dimensional stability of the decorative board A manufactured using the long fiber board 5 as the base material 1 can be further enhanced.

In the embodiment shown in FIG. 6, the long fiber board 5 is manufactured from the three-layer long fiber mat 4, but the number of layers of the long fiber mat 4 and the thickness of each layer can be appropriately set. it can. In order to reduce the warpage of the decorative board A,
The long fiber mats 4 are preferably laminated so as to be symmetrical with respect to the thickness direction, and are preferably laminated in an odd number of layers.

In the decorative board A of the present invention, the thickness ratio of the fiberboard 2 composed of the woven fabric 6 to the whole is preferably in the range of 5 to 90%, more preferably in the range of 20 to 50%. Within this range, it is possible to obtain a decorative board A utilizing the characteristics of the base material 1 while maintaining the high designability of the woven fabric 6 and good strength characteristics and dimensional stability. The density and thickness of the decorative board A can be adjusted by appropriately selecting the type and amount of the adhesive used when attaching the fiberboard 2 to the base material 1 and the molding conditions during hot pressing. It can be controlled.

[0039]

The present invention will be specifically described below with reference to examples.

(Example 1) A kenaf long fiber having a fiber length of 1000 to 2000 mm obtained by fibrillating a kenaf bast portion was used as a woven material, and a plurality of the kenaf long fibers were bundled and twisted. Thus, a continuous yarn having a diameter of about 1 mm was formed, and this yarn was used as a warp yarn 10 and a weft yarn 11 and plain-woven by a simple loom to obtain a woven fabric 6. The obtained woven fabric 6 has a lattice-like appearance in which a plurality of warp yarns 10 and weft yarns 11 are arranged and woven together, as shown in FIG. 2B.

Next, the woven fabric 6 is immersed in a phenolic adhesive solution, dried at 80 ° C., and then subjected to hot-press molding, whereby a density of 800 kg / m ³ and a thickness of about 1 mm shown in FIG. Such a fiberboard 2 was produced. Here, the phenol-based adhesive solution is prepared by adjusting the resin solid content concentration in advance so that the impregnation amount of the phenol-based adhesive into the fabric 6 becomes 15% by mass. 1
The pressure was set at 65 ° C., the press pressure was 4.0 MPa, and the press time was set at 5 minutes.

The substrate 1 has a density of 600 kg / m
^3. A decorative board A having a total thickness of 4 mm as shown in FIG. 1A is obtained by bonding a fiber board 2 to the surface of the substrate 1 with a urethane-based adhesive using a 3 mm-thick Rawan plywood. Was.

(Example 2) Jute fiber as a textile material
To produce a woven fabric 6 in the same manner as in Example 1, and then
This fabric 6 is hot-pressed in the same manner as in Example 1 and
900 kg / m ^ThreeThus, a fiber board 2 having a thickness of about 1 mm was obtained.
And, as the substrate 1, the density is 600 kg / m.^Three, Thickness 2m
m of rawan plywood, and the substrate 1
By attaching the fiberboard 2 one by one with urethane adhesive
Thus, a decorative board A having a total thickness of 4 mm as shown in FIG. 4 was obtained.

(Example 3) As the substrate 1, a density of 750 kg
/ M ^3, using MDF thickness 3 mm, in Example 1 and the density 800 kg / m ³ was obtained in the same manner, attaching the fiber board 2 having a thickness of about 1mm with a urethane-based adhesive to the surface of the substrate 1 As a result, a decorative board A having a total thickness of 4 mm as shown in FIG. 1A was obtained.

Example 4 A phenolic adhesive was uniformly dispersed in a kenaf long fiber having a fiber length of 1,000 to 2,000 mm obtained by defibrating a kenaf bast portion to a concentration of 15% by mass. The kenaf long fiber mat 4 was produced by stacking and assembling in a state where the fiber directions were oriented so that the fiber direction was substantially constant. Next, the long fiber mat 4 is hot-pressed under the conditions of a pressing temperature of 165 ° C., a pressing pressure of 4.0 MPa, and a pressing time of 5 minutes to obtain a kenaf long fiber plate 5 having a density of 600 kg / m ³ and a thickness of 2.8 mm.
I got Then, using the long fiber board 5 as the base material 1, a fiber board 2 having a density of 750 kg / m ³ and a thickness of about 1.2 mm obtained in the same manner as in Example 1 was applied to the surface of the base material 1 by a urethane-based adhesive. 5m total thickness as shown in Fig.5
m of decorative board A was obtained.

Example 5 A kenaf long fiber mat 4 was obtained in the same manner as in Example 4. The long fiber mats 4 are stacked with the orientation directions of the respective layers alternately perpendicular to each other so that the ratio of the thickness is 1: 2: 1 from the surface side, and hot-pressed in the same manner as in Example 4. According to the density of 600 kg / m ³ ,
A kenaf long fiber board 5 having a thickness of 3 mm was obtained. Then, using the long fiber board 5 as the base material 1, a fiber board 2 having a density of 800 kg / m ³ and a thickness of about 1 mm obtained in the same manner as in Example 1 is adhered to the surface of the base material 1 with a urethane adhesive. By this, a decorative board A having a total thickness of 4 mm as shown in FIG. 6 was obtained.

Example 6 A sisal fiber having a length of 100
By cutting to ~ 200 mm, sisal long fibers were obtained. Other than using this sisal long fiber instead of kenaf long fiber,
In the same manner as in Example 1, a fiberboard 2 having a density of 700 kg / m ³ and a thickness of about 1 mm was obtained. Thereafter, a decorative board A was obtained in the same manner as in Example 1.

Comparative Example 1 A decorative board was obtained by performing print makeup on the surface of a particle board having a density of 600 kg / m ³ and a thickness of 7 mm.

Comparative Example 2 A decorative sheet was adhered to the surface of an MDF having a density of 750 kg / m ³ and a thickness of 4 mm to obtain a decorative board.

The performance of the decorative boards of Examples 1 to 6 and Comparative Examples 1 and 2 was evaluated with respect to bending strength, dimensional change with respect to temperature change and humidity change, and water resistance.

The bending strength was determined by an equivalent bending Young's modulus, which is a bending Young's modulus when the entire decorative board is assumed to have a homogeneous structure.

As an index indicating dimensional stability, a dimensional change rate was used. The measurement of the dimensional change rate is based on the heat-sensitive repetition test (8) specified in JAS “Japanese Agricultural Standards for Special Plywood”.
This was repeated twice at 0 ± 3 ° C. for 2 hours and at 20 ± 3 ° C. for 2 hours) to determine the dimensional change before and after the test.

As an index indicating water resistance, a dip-peeling test was performed, the appearance change after the test was observed, and a three-step evaluation was performed according to the following evaluation criteria.

：: No change in appearance (no peeling) Δ: Partial peeling (total length of peeling on each side is 5)
0% or less) X: Peeling occurred entirely. Table 1 shows the results of the performance evaluation described above. As can be seen from Table 1, each of the examples had better bending strength, water resistance and dimensional stability than the comparative example.

[0055]

[Table 1]

[0056]

As described above, the invention according to claim 1 is a decorative bow formed by including a base material and a fiber board adhered to the surface of the base material, wherein the fiber board is: Because it is made by hot-pressing a woven fabric consisting of fibers with a length of 50 mm or more obtained by fibrillating the bast part of a plant, the excellent strength of the long fiber obtained from the bast part of the plant By having a fiberboard on the surface that effectively exerts, it is possible to impart sufficient strength to the decorative board, excellent dimensional stability against temperature changes and humidity changes, and even higher water resistance, and This fiberboard is made of a woven fabric capable of imparting various textures and appearances, and can provide a decorative board having a good design without the need to attach a surface finishing material. It is.

According to the second aspect of the present invention, since the fiberboard is attached to both surfaces of the substrate, the mechanical strength of both sides of the substrate can be increased, and the decorative board can have higher strength. It can be provided, and can be formed in a structure symmetrical with respect to the thickness direction, so that deformation in the thickness direction such as warpage can be suppressed.

Further, according to the invention of claim 3, the base material is
Since a wood-based board selected from plywood, MDF, particle board, and wood veneer is used, a fiber board is adhered to these wood-based boards which are inexpensive but have poor strength and dimensional stability. Thereby, sufficient strength and high dimensional stability can be imparted, and an inexpensive decorative board can be provided.

The invention according to claim 4 is that, as the base material,
A long-fiber board made by hot-pressing a long-fiber mat consisting of an aggregate in which an adhesive is dispersed in many long fibers obtained from at least one of kenaf, oil palm, and coconut and the fiber direction is oriented. The long fiber board made of these long fibers has strength, dimensional stability,
It is excellent in water resistance, and a decorative board having higher strength, dimensional stability, and water resistance can be obtained by combining the long fiber board used as the base material with the above fiber board.

According to a fifth aspect of the present invention, the long fiber board is manufactured by laminating a plurality of layers of long fiber mats and hot-pressing the long fiber mats so that each long fiber mat has an orientation direction of the long fibers orthogonal to each other. Since the laminated one is used, the anisotropy of the long fiber board can be reduced, and a decorative board which can further suppress the dimensional change in the in-plane direction can be obtained.

According to a sixth aspect of the present invention, as the fibrous plate, a fibrous plate formed by hot-pressing a woven fabric comprising at least one fiber selected from kenaf fiber, jute fiber and sisal fiber is used. Therefore, it is possible to obtain a decorative board utilizing the performance of these fibers having a very high tensile strength, and it is possible to effectively use these fibers that are often discarded.

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of the present invention,
(A) is a perspective view of a decorative board, (b) is a perspective view of a fiber board.

FIGS. 2A and 2B show an example of the above woven fabric, wherein FIG. 2A is an enlarged schematic cross-sectional view and FIG. 2B is an enlarged schematic plan view.

FIG. 3 shows another example of the above woven fabric,
(A) is an enlarged schematic sectional view, and (b) is an enlarged schematic plan view.

FIG. 4 is a perspective view showing another example of the embodiment of the present invention.

FIG. 5 is a partially broken perspective view showing still another example of the embodiment of the present invention.

FIG. 6 is a partially broken perspective view showing still another example of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Fiber board 3 Long fiber 4 Long fiber mat 5 Long fiber board 6 Woven fabric

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kazunori Umeoka 1048, Kazuma Kadoma, Kadoma-shi, Osaka, Japan Inside Matsushita Electric Works, Ltd. (72) Inventor Hideyuki Ando 1048 Kadoma, Kazuma, Osaka Pref.F-term in Matsushita Electric Works, Ltd. DB12C DG06B DG06C DG12B EJ17B EJ17C EJ42B EJ42C EJ82 GB08 GB81 HB00 JB06 JK01

Claims (6)

[Claims] 1. A decorative board comprising a base material and a fiber board attached to the surface of the base material, wherein the fiber board is obtained by fibrillating a plant bast. A decorative board characterized by being produced by hot-pressing a woven fabric made of fibers having a length of 50 mm or more. 2. The decorative board according to claim 1, wherein the fiberboard is attached to both surfaces of the base material. 3. The decorative board according to claim 1, wherein the base material is a wood board selected from plywood, MDF, particle board, and wood veneer. 4. A long-fiber mat made of an aggregate in which an adhesive is dispersed in a plurality of long fibers obtained from at least one of kenaf, oil palm, and coconut and the fiber direction is oriented, The decorative board according to claim 1, wherein the decorative board is a long fiber board formed by molding. 5. A long-fiber board is produced by laminating a plurality of layers of long-fiber mats and hot-press molding, and each long-fiber mat is laminated so that the orientation direction of the long fibers is orthogonal. The decorative board according to claim 4, characterized in that: 6. A fiberboard comprising: kenaf fiber, jute fiber,
The decorative board according to any one of claims 1 to 5, wherein the decorative board is produced by hot-pressing a woven fabric made of at least one fiber selected from sisal fibers.