JP2521408Y2 - Laminate - Google Patents

Description

[Detailed description of the device]

[0001]

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

[0002]

2. Description of the Related Art Laminated sheets include plywood obtained by laminating and adhering veneers with their fiber directions orthogonal to each other, and parallel plywood (LVL) adhering the veneers of the veneers in the same direction. It is a must-have as one of the current building materials because it can stably supply a large amount of large-sized boards that cannot be obtained from sawn timber and has excellent dimensional stability. Is.

[0003]

[Problems to be solved by the invention] However, since this plywood is manufactured by laminating and adhering thin wood veneer laminated to each other, the problem of depletion of natural resources is widely taken up worldwide, and It becomes difficult to cut down wood and the quality of raw wood deteriorates, making it difficult to obtain a large amount of good quality veneer to be used for veneer, and it is possible to supply a large amount of good quality plywood to the market. It will be difficult. This problem is expected to become more serious in the future, and there is an eager desire to provide an alternative to plywood.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been accomplished as a result of a devising for the purpose of providing a novel laminate which can be used as a substitute for plywood.

That is, according to the present invention, as shown in FIG. 1, a laminated plate having a wood fiber layer 3 as a core, and wood shaving layers 2a, 2b and wood veneer layers 1a, 1b are integrally laminated on the front and back surfaces thereof. Is.

For the wood fiber layer 3 which is the core of the laminated board, a hard board, MDF, insulation board, etc., obtained by pressing and molding wood fibers obtained by defibrating wood chips obtained by cutting raw wood waste by a conventional method are used. be able to.

As the wood chip layer 2a, 2b, for example, a chipboard, a flake shape, or a strand-shaped wood chip obtained by cutting a raw wood is pressure-molded, an OS.
B, a wafer board or the like can be used. These wood shaving layers 2a and 2b are formed by press-molding the wood shavings with the fiber direction oriented in a fixed direction when the wood shavings are dropped and deposited in the manufacturing process to form a wood shaving mat. What was obtained by this is preferable.

The wood veneer layers 1a laminated on the front and back surfaces,
As 1b, a hardwood veneer and a softwood veneer can be used. The fiber directions of the front-side wood veneer layer 1a and the back-side wood veneer layer 1b are generally configured such that the fiber directions thereof are parallel to each other, similar to the front and back veneers when forming plywood.

Further, a wood shaving layer 2 having a constant orientation direction
a. 2b and wood veneer layer 1a. When laminating 1b, the wood veneer layers 1a, 1b laminated on the front and back surfaces are laminated so that the direction of the conical pyramid and the orientation of the wood chips are not parallel. Preferable <is laminated so as to be orthogonal to each other. By absorbing and releasing moisture, the wood veneer layers 1a and 1b laminated on the front and back surfaces have a contraction and expansion in the direction perpendicular to the fiber direction which is 5 to 20 times larger than the contraction and expansion in the direction parallel to the fiber direction of the veneer. <The rate of change between the direction parallel to the fiber direction and the direction perpendicular to the fiber direction is significantly different.

On the other hand, by orienting the fiber directions of the wood shavings layers 2a, 2b in a fixed direction, the wood shavings layers 2a, 2b have properties close to those of a wood veneer, and the wood shaving layers 2a, 2b shrink due to moisture absorption and release. As for the expansion, the contraction expansion in the direction perpendicular to the fiber direction is larger than the contraction expansion in the direction parallel to the fiber direction. Therefore, these wood veneer layers 1a. 1b and the wood shaving layers 2a and 2b alone have a particularly large dimensional change due to moisture absorption and desorption, and the contraction and expansion in the direction perpendicular to the fiber direction are particularly large, but these two wood veneer layers 1a and 1b and the wood shavings By laminating so that the fiber directions of the layers 2a and 2b are not parallel to each other, the contraction and expansion caused by moisture absorption and desorption are mutually restrained between the adjacent plate materials and significantly suppressed. This suppressing effect is particularly excellent when the fibers are laminated with their fiber directions orthogonal to each other, and it is possible to prevent warpage and twisting due to contraction and expansion.

The wood fiber layer 3 laminated as the core material
Has an excellent stability such that the dimensional change rate per 1% of water content is 0.03 to 0.04% even in the length direction and the width direction, and thus the wood veneer layer 1a. 1b and wood scrap layer 2
The stability of the wood fiber layer 3 is added to the contraction / expansion suppressing effect of a and 2h, so that the laminated plate has further excellent dimensional stability. This is comparable to the performance of plywood having excellent dimensional stability, in which the dimensional change due to moisture absorption and desorption is 0.02 to 0.03% per 1% of water content.

Also in terms of mechanical strength, the bending strength of the wood veneer is strong in the direction parallel to the fiber direction, and the wood chip layers 2a and 2b are bent in the direction parallel to the orientation direction of the wood chips. The property of high strength is that the laminate obtained by laminating the fibers so that the fiber directions are not parallel to each other has excellent mechanical strength in both the length direction and the width direction.

The laminated board of the present invention includes, for example, preliminarily manufactured wood veneer layers 1a and 1b, wood shaving layer 2a. 2b and the wood fiber layer 3 with the wood veneer layer 1a. 1b
It is obtained by stacking so that the fiber direction of and the orientation direction of the wood shavings are not parallel, and hot pressing according to the usual method, or depositing wood shavings to form a wood shavings mat layer, and then Similarly, wood fibers are deposited to form a wood fiber mat layer, and then wood chips are deposited on the wood fiber mat layer to form a wood particle mat layer. With the core as the core, the wood scrap layer 2a. Two
b is obtained by laminating and integrating the wood veneer layers 1a. It can also be obtained by bonding 1b.

If necessary, a decorative sheet is adhered to the surface of the laminate thus obtained. The decorative sheet for bonding, for example, natural thin veneer obtained by cutting the natural wood having a thickness of about 0.2-3mm, 20-40g / ^{m 2} of the decorative sheet, 32-500g / ^{m 2} of non-woven fabric 50 g / pattern pattern printing and monochromatic painting of birch instrument paper or the like of m ^2, can be used that has been subjected to. Alternatively, an overcoating step may be provided after adhering the decorative sheet. For adhesion of the decorative sheet, a thermoplastic adhesive such as vinyl acetate resin mixed with a thermosetting decorative resin or urea powder for improving water resistance can be used.

[0015]

As a core material, the wood fiber layer 3 and the wood shaving layer 2a. Since an industrial material such as 2b is used, it is a material having a uniform plate thickness and surface smoothness, and the resulting laminate has excellent surface properties.

Further, the wood fiber layer 3 and the wood shaving layers 2a, 2b used as the core material are obtained by crushing or defibrating a raw wood having a defect that cannot be used as a single plate. It can be an effective use of resources and help prevent the destruction of nature.

Furthermore, the fiber direction of the front and back wood veneer layers 1a, 1b and the wood shaving layer 2a, 2b laminated inside thereof.
By stacking the wood shavings so that the orientation directions of the wood shavings are not parallel to each other, the contraction and expansion due to moisture absorption and desorption are suppressed between the adjacent layers to be significantly reduced.

Further, since the wood fiber layer 3 located at the center has excellent dimensional change rate in the length direction and the width direction and has excellent stability, the wood veneer layers 1a and 1b and the wood shavings are The wood fiber layer 3 has an effect of suppressing contraction and expansion of the layers 2a and 2b.
By adding the stability of 1., a laminated plate having a property further excellent in dimensional stability is obtained. Further, by laminating the wood veneer layers 1a, 1b and the wood shaving layer 2a, 2b so that the fiber directions thereof are not parallel to each other, the mechanical strength can be improved.

Further, when comparing the wood fiber board constituting the laminated board of the present invention with the wood shaving board and the veneer, the wood veneer has a certain fiber direction and maintains a space such as a conduit hole parallel thereto. The plate material is formed in this state. Since the wood shaving plate is made by integrating the wood cut into chips, each chip unit still has voids such as fiber directions and conduit holes similar to the wood veneer. Therefore, nails can be easily driven into the wood veneer and the wood shaving plate. On the other hand, since the wood fiber board is made by integrating the fibrillated wood fibers into one piece, it does not have such voids and the wood fibers are in a homogeneous and densely integrated state. It is more difficult to drive nails than wood shavings. On the other hand, the wooden fiberboard having a dense structure is superior in the nail holding power after the nail is driven. According to the structure in which the wood fiberboard of the present invention is used as the core, and the wood shaving layer and the wood veneer layer are sequentially laminated on the front and back sides, respectively, the wood veneer is on the front and back sides and the wood shaving layer is on the inside. Since nails are arranged, nails can be driven easily. Further, when the nail is driven into the wood fiberboard of the core, the nail is stable in a state of penetrating the wood veneer and the wood shavings, and therefore further nailing is not difficult. Further, by nailing the nail into the wood fiberboard, it is possible to obtain a nail holding power superior to that obtained by hammering only the wood veneer and the wood shaving layer. It should be noted that this effect shows similar properties not only for nails but also for screwing in wood screws.

[Brief description of drawings]

FIG. 1 is a sectional view of a laminated plate having a five-layer structure,

[Explanation of symbols]

1a, 1b: wood veneer layer, 2a, 2b: wood shaving layer, 3:
Wood fiber layer.

Claims (2)

(57) [Scope of utility model registration request] 1. A laminate comprising a wood fiber layer as a core, and a wood shaving layer and a wood veneer layer sequentially laminated on the front and back surfaces thereof. 2. The wood shavings of the wood shaving layer are oriented in a fixed direction, and are laminated and integrated so that the orientation direction is not parallel to the fiber direction of the wood veneer layer. Laminated board.