JP2606268Y2 - Laminated board - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated board used for structural materials, architectural coverings, interior decorations, furniture and the like.

[0002]

2. Description of the Related Art Laminates are plywood in which veneers are laminated and bonded with their fiber directions orthogonal to each other, and parallel plywood (LVL) in which the veneers are laminated in the same direction. It is widely used as a building material and furniture material because it can stably supply a large amount of large-sized boards that cannot be obtained with sawn timber and has excellent dimensional stability. .

[0003]

[Problems to be solved by the invention] However, since these plywoods and parallel plywoods are manufactured by laminating and bonding veneers made of natural wood thinly, the problem of depletion of natural resources is taken up worldwide. In recent years, it has become difficult to cut down raw wood, which is a raw material, and it has become difficult to obtain a large quantity of high-quality veneers due to the deterioration of the quality of raw wood. It is difficult to supply a large amount of plywood to the market in a stable manner. This problem is expected to become even more serious in the future, and there is an aspiration to develop and provide an alternative to plywood.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a novel laminate excellent in dimensional stability and mechanical strength suitable for use as a substitute for plywood.

That is, the laminated board according to the present invention has a middle wood veneer layer on the surface of the middle wood fiber layer and a back wood veneer layer on the back surface, and the surface of the middle wood veneer layer is later provided with makeup. The surface wood fiber layer to be applied is laminated and integrated,
The middle wood veneer layer is formed to be thicker than the back wood veneer layer.

According to a preferred aspect of the present invention, in the laminated board, the thickness of the surface wood fiber layer and the thickness of the middle wood fiber layer are substantially equal.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a laminated board according to the present invention has a surface wood fiber layer 1, a middle wood veneer layer 3, a middle wood fiber layer 2, and a back wood veneer layer 4 from the front side. And the thickness of the middle-layer wooden veneer layer 3 is formed to be thicker than that of the back-layer wooden veneer layer 4.

The middle wood veneer layer 3 and the back wood veneer layer 4 of the laminated board are made of softwood veneer obtained by cutting a softwood or hardwood raw material using a cutting device such as a rotary lace or a slicer. Alternatively, a hardwood veneer can be used.

[0009] These softwood veneers and hardwood veneers have a thickness of 0.2 mm or more, preferably 0.5 to 5.5 mm. When the plate thickness is 0.2 mm or less, it does not contribute to improvement in mechanical strength as a laminate. 0.5m thick
When it is at least m, it can greatly contribute to improvement of the mechanical strength of the laminate. On the other hand, if the thickness is 5.5 mm or more, the shrinkage and expansion of the veneer due to the absorption and release of moisture are increased, which is not preferable because the dimensional stability of the laminate is impaired.

The fiber directions of the middle wood veneer layer 3 and the back wood veneer layer 4 can be arranged so as to be parallel or perpendicular to each other. However, shrinkage and expansion due to moisture absorption and desorption generally differ greatly in the direction parallel to the fiber direction of wood and in the direction perpendicular to the fiber direction. The rate of change in contraction and expansion in the direction is 5 to 20 times larger. For this reason, by arranging the middle wood veneer layer 3 and the back wood veneer layer 4 so that the fiber directions are perpendicular to each other, these veneer layers shrink greatly in the direction perpendicular to the fiber direction as moisture is absorbed and released. The movements to expand are suppressed from each other, so that the contraction and expansion in the length direction and the width direction of the laminate are equalized, and the dimensional stability of the laminate can be improved.

Further, in the present invention, the middle wood veneer layer 3 is formed thicker than the back wood veneer layer 4. this is,
Since the back layer veneer veneer layer 4 is disposed at a position farther from the center of the laminated board in the thickness direction of the laminated board than the middle layer veneer veneer layer 3, shrinkage and expansion of the back layer veneer veneer layer 4 due to moisture absorption / release is achieved. Movement has a large effect on warpage as a laminate. For this reason, by making the thickness of the back layer veneer veneer layer 4 thinner than the thickness of the middle layer veneer layer veneer 3, the movement of contraction and expansion of the back layer veneer veneer layer 4 is weakened, and the laminated board warps (especially the back side). It is possible to effectively prevent the occurrence of warpage having a concave side.

Further, since the relatively thick middle-layer veneer veneer layer 3 is disposed substantially at the center in the thickness direction of the laminated board, the holding force of the wood screws when fixing the laminated board to the base structural material or the like is reduced. It will be very strong.

Further, in a preferred embodiment of the present invention, the thickness of the surface wood fiber layer 1 and that of the middle wood fiber layer 2 are substantially equal. As a result, a balance in the thickness direction between the three layers including the wood fiber layers 1 and 3 arranged on the front and back of the intermediate wood veneer layer 3 can be obtained with the center as the center, so that the laminated board is less likely to warp. In the laminated board of the present invention, the back wood veneer layer 4 is laminated on the back side of the middle wood fiber layer 2, but the back wood veneer layer 4 is relatively thin as described above. In addition, in the actual use state of this laminated board, the surface of the surface wood fiber board 1 is subjected to makeup by sticking a veneer or the like, so that the balance in the thickness direction is not broken.

Further, in terms of mechanical strength, the wood veneer has the property that the bending strength and the tensile strength are large in the direction parallel to the fiber direction. It is preferable to dispose them so as to be parallel to the length direction of. By doing this,
When a bending load is applied in the length direction of the laminated plate of the present invention, the durability against the tensile load generated on the back side is improved, and the laminated plate has excellent properties in bending strength in the longitudinal direction. . Therefore, the laminated board of the present invention
Generally, it is a plate material that is very suitable for use as a substrate that requires a large bending strength particularly in the length direction, such as a floor material constructed so that its longitudinal end is supported by the underlying structural material.

The wood veneer used for the middle wood veneer layer 3 and the back wood veneer layer 4 is a phenol resin treatment.
Acetylation treatment, esterification treatment, formalization treatment, P
The bending strength and the dimensional stability of the laminated plate are further improved by using a material subjected to a treatment such as EG (polyethylene glycol) treatment or WPC (resin impregnation) treatment to improve dimensional stability and mechanical properties. It will be.

Further, the wood veneer used for the middle wood veneer layer 3 and the back wood veneer layer 4 is treated with a flame retardant such as ammonium phosphate, phosphorus nitrogen compound, halogen compound, sulfamic acid or boric acid. By using a veneer subjected to the above method, a laminate having a fireproof function can be obtained. These treatments are performed by an arbitrary method such as a method of dipping a veneer into a fire retardant, a method of applying a chemical, or a method of injecting a chemical under pressure or reduced pressure.

The surface wood fiber layer 1 and the middle wood fiber layer 2 of the laminated board are made of softwood such as pine, cedar, cypress or hardwood such as lauan, kapole, chestnut and poplar, or wood cut from waste wood. A wood fiber layer obtained by press-molding wood fibers obtained by defibrating chips by a conventional method and having a specific gravity of 0.4 or more, preferably 0.5 or more, which is known alone as a hard board, MDF, or the like. It is. These wood fiber layers may be mixed with waste materials such as sander dust, saw dust, chip dust and the like generated during the manufacture of wood fiber board.

These wood fiber layers have a uniform dimensional change rate per 1% moisture content in the length direction and the width direction alone, and have an excellent stability of 0.03 to 0.04%. Therefore, the middle wood veneer layer 3 and the back wood veneer layer 4 are arranged so that their fiber directions are orthogonal to each other. Are synergistically acted on, so that a laminated plate having further excellent dimensional stability is obtained. The thus obtained laminate of the present invention has excellent dimensional stability comparable to plywood having a dimensional change due to moisture absorption / desorption of 0.02 to 0.03% per 1% of water content. is there.

In terms of mechanical strength, the wood fiber layer has a higher specific gravity than wood veneer and has excellent compression and shear strength. For this reason, excellent results are exhibited even in a test of dropping an iron ball on the surface, and the steel ball has a property that it is not easily dented even when a load is locally applied by a high heel or a caster.

In addition, the surface wood fiber layer 1 exhibits excellent compression resistance against a compressive load generated on the surface side when a bending load is applied to the laminated board, and the laminated wooden board in the length direction and the width direction as the laminated board. It has excellent bending strength.

Furthermore, since a wood fiber layer excellent in smoothness and workability is arranged on the surface, an excellent finish can be obtained when a decorative sheet is applied or a coating treatment is applied, and an optional finish can be obtained. Cutting in the direction can also be easily performed.

The wood fiber layers used for the surface wood fiber layer 1 and the middle wood fiber layer 2 are phenol resin treatment, acetylation treatment, esterification treatment, formalization treatment, PEG (polyethylene glycol) treatment or WP
By using a material subjected to a treatment such as a C (resin impregnation) treatment to improve the dimensional stability and the mechanical properties, the bending strength and the dimensional stability of the laminate are further improved.

In these treatments, for example, softwood such as pine, cedar and cypress or hardwood such as lauan, kapole, chestnut and poplar are made into chips, defibrated according to a conventional method, and dried at the stage of wood fiber. The above-mentioned treatment is carried out by a conventional method, and a wood fiber layer is produced by using the obtained wood fiber.

Further, by using a wood fiber which has been treated with a flame retardant such as ammonium phosphate, phosphorus nitrogen compound, halogen compound, sulfamic acid, boric acid, etc., the wood fiber layer is provided with a fire protection function. The obtained laminated plate is obtained. These treatments are performed by an arbitrary method such as a method of dipping wood fibers in a fire retardant, a method of applying a chemical, or a method of injecting a chemical under a pressure or a reduced pressure.

The laminated board of the present invention uses, for example, a wood fiber board and a wood veneer which have been manufactured in advance, and becomes a wood fiber board (which becomes the surface wood fiber layer 1) and a (middle wood veneer layer 3) from the front side. By laminating a wood veneer, a wood fiber board (to be an intermediate wood fiber layer 2) and a wood veneer (to become a back wood veneer layer 4) via an adhesive in this order, and pressing in accordance with a conventional method. can get.

In the process of manufacturing a wood fiber board, a wood fiber obtained by applying a bonding agent by a forming device, drying a wood fiber deposited on a screen belt, cutting it into a certain size, and temporarily pressing the wood fiber is obtained. Using a mat, place a wood veneer coated with adhesive on its front side, put a wood veneer coated with adhesive on its front and back surfaces, and finally put another wood fiber mat, The laminate of the present invention can be manufactured by pressing.

This method is industrially advantageous because a conventional wood fiberboard production line can be used as it is, and hot pressing can be performed in a single-shot (one-shot) manner. In addition, an extremely excellent adhesive strength between the wood fiber layer and the wood veneer layer in the obtained laminate is obtained.

In addition, a wooden veneer is placed on a screen belt and inserted into a forming device, wood fibers are deposited on the wooden veneer, another wooden veneer is placed thereon, and then a forming device is further placed. After the wood fibers are deposited at, cut at regular intervals, and temporarily press and hot press, or temporarily press without cutting, and then continuously hot press to cut,
A laminate of the present invention can also be obtained. Alternatively, after the wood fiber is deposited on the screen belt house by the forming device, the wood veneer is placed on the wood fiber, and the wood fiber is further deposited on the wood fiber by the forming device, and then another wood veneer is placed on the wood fiber. After mounting, it can be cut at regular intervals and temporarily pressed and hot-pressed, or it can be temporarily pressed without cutting and continuously hot-pressed and then cut to obtain the laminated board of the present invention. it can.

The surface of the surface wood fiber layer 1 arranged on the surface side of the laminated board of the present invention is to be subjected to makeup later,
For example, makeup is applied by attaching a makeup sheet. As the decorative sheet, for example, a natural veneer, an artificial veneer having a thickness of about 0.2 to 3 mm obtained by cutting natural wood, a veneer sheet obtained by backing a nonwoven fabric, paper, a synthetic resin sheet, or the like, 20 to 40 g / M ² decorative paper, 32-50
A non-woven fabric of 0 g / m ² , a pattern of 50 g / m ² parchment paper, or the like, which has been subjected to pattern printing or monochromatic coating can be used. A top coat may be applied after the decorative sheet is bonded. Bonding of these decorative sheets can be performed using a thermoplastic resin adhesive such as a vinyl acetate resin mixed with a thermosetting resin or urea powder for improving water resistance.

The laminate of the present invention has a small shrinkage and expansion due to moisture absorption and desorption of the surface wood fiber layer 1 on the surface of the laminate as described above. Does not occur.

[0031]

The laminated board according to the present invention has a laminated structure in which a part of the conventional veneer veneer is replaced with a wood fiber layer, but these wood fiber layers reduce the size of the raw wood which has a drawback that cannot be used as a veneer. Since it can be obtained by using crushed and defibrated materials, resources can be effectively used and natural destruction can be prevented.

The middle wood veneer layer is covered with the wood fiber layer and is not exposed on the front and back of the laminate, so that a low-grade veneer can be used, and further effective use of resources can be achieved and the laminate can be used. Costs can be reduced.

In the laminated board of the present invention, the middle wood veneer layer is formed thicker than the back wood veneer layer 4.
That is, since the backing wooden veneer layer disposed at a position distant from the center in the thickness direction of the laminated board is provided relatively thin, the movement of contraction and expansion due to moisture absorption and desorption is weakened, and the laminated board is warped. This can be effectively prevented. In addition, since the relatively thick middle-thick wooden veneer layer 3 is disposed substantially at the center in the thickness direction of the laminate, a laminate having excellent wood screw holding power can be obtained.

Further, the thickness of the surface wood fiber layer and that of the middle wood fiber layer are set to be substantially equal, so that the three wood layers including the wood fiber layers arranged on the front and back of the middle wood veneer layer are centered. Since the balance in the thickness direction can be obtained, the laminate is less likely to warp.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a laminate according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 surface wood fiber layer 2 middle wood fiber layer 3 middle wood veneer layer 4 back wood veneer layer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B27N 3/04 B27D 1/04 B32B 21/10

Claims (2)

(57) [Scope of request for utility model registration] (1) an intermediate wood veneer layer on the surface of an intermediate wood fiber layer;
The back wood veneer layer is laminated on the back side, and the surface wood fiber layer to be decorated later is integrated and laminated on the surface of the middle wood veneer layer, and the thickness of the middle wood veneer layer is reduced. A laminated board characterized by being formed thicker than a backing wood veneer layer. 2. The laminate according to claim 1, wherein the thickness of the surface wood fiber layer and that of the middle wood fiber layer are substantially equal.