JPH063607U - Laminate - Google Patents

Abstract

(57) [Summary] (Corrected) [Constitution] Wood fiber layer 3 is the core, and wood cutting layer 2 is on the front and back sides.
a, 2b and wood veneer layers 1a, 1b 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. [Effect] The wood fiber layer 3 and the wood shaving layers 2a, 2 as core materials
Since it uses industrial materials such as b, it is a material with uniform plate thickness and surface smoothness, and the resulting laminate has excellent surface properties. It also makes effective use of resources and further shrinks due to moisture absorption and desorption. Expansion is suppressed between the adjacent layers to be remarkably reduced, and the dimensional stability is excellent and the mechanical strength can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a laminated board used for structural materials, as well as for building exteriors, interiors and furniture.

[0002]

[Prior art]

 Laminated boards are known such as plywood in which single fibers are laminated and bonded with their fiber directions orthogonal to each other, and parallel plywood (L.V.L.) in which the fiber directions of single plates are laminated and bonded in the same direction. It is an indispensable part of today's 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.

[0003]

[Problems to be solved by the device]

 However, since this plywood is manufactured by laminating and bonding veneer from which thin pieces of natural wood have been peeled off, the problem of depletion of natural resources has been widely taken up worldwide, and it has become difficult to cut down raw materials that are raw materials. As the quality of raw wood deteriorates, it becomes difficult to obtain a large amount of good quality veneer used for veneer, and it becomes difficult to supply a large amount of good quality plywood to the market. It is predicted that this problem will become more serious in the future, and there is a strong desire to provide an alternative to plywood.

[0004]

[Means for Solving the Problems]

 The present invention has been completed as a result of earnest efforts for the purpose of providing a novel laminated plate that 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 and 2b and wood veneer layers 1a and 1b are laminated and integrated on the front and back surfaces thereof. Is.

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

The wood shaving layers 2a and 2b are made of, for example, particle boards, OSBs, wafer boards, etc. obtained by press-molding chips, flakes, and strands of wood shavings obtained by cutting raw wood. Any thing can be used. The 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 is obtained is preferred.

As the wood veneer layers 1a and 1b laminated on the front and back surfaces, 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, similarly to the front and back veneers when forming plywood.

Further, when laminating the wood shaving layers 2a, 2b having a certain orientation direction and the wood veneer layers 1a, 1b, the fiber directions of the wood veneer layers 1a, 1b to be laminated on the front and back surfaces and this tree. Stack them so that the orientation of the chips is not parallel. Preferably, the layers are laminated so that they are 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 expansion of 5 to 20 in the direction perpendicular to the fiber direction as compared with contraction expansion in the direction parallel to the fiber direction of the veneer. It is twice as large, and the rate of change in the direction parallel to the fiber direction and in the direction perpendicular to the fiber direction is very different.

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

Further, the wood fiber layer 3 laminated as the core material has an excellent stability that the dimensional change rate per 1% of water content is 0.03 to 0.04% evenly in the length direction and the width direction. Since the wood veneer layers 1a, 1b and the wood shaving layers 2a, 2b suppress the contraction and expansion of the wood veneer layers 1a, 1b, the stability of the wood fiber layer 3 is added to further improve the dimensional stability. It becomes a laminated plate having excellent properties. This is comparable to the performance of plywood, which has excellent dimensional stability with a dimensional change rate of 0.02 to 0.03% per 1% water content due to moisture absorption and desorption.

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

In the laminated board of the present invention, for example, the wood veneer layers 1a, 1b, the wood shaving layers 2a, 2b and the wood fiber layer 3 which have been manufactured in advance are attached to the wood veneer layer 1a, It can be obtained by laminating the fiber direction of 1b and the orientation direction of the wood shavings so that they are not parallel to each other, and heat-pressing them according to a conventional method, or depositing the wood shavings to form a wood shaving mat layer. Similarly, wood fibers are deposited on top of this to form a wood fiber mat layer, and then wood chips are deposited on it to form a wood chip mat layer. It is also obtained by using the fiber layer 3 as a core to obtain a laminated board in which the wood cutting pieces layers 2a and 2b are laminated and integrated on the front and back sides, and by adhering the wood veneer layers 1a and 1b to the front and back sides with an adhesive. .

If necessary, a decorative sheet is attached to the surface of the thus obtained laminated plate. Examples of the decorative sheet to be adhered include natural thin veneer obtained by cutting natural wood having a thickness of about 0.2-3 mm, 20-40 g / m ² decorative paper, 32-500 g / m ² non-woven fabric 50 g. / M ² parchment paper or the like on which pattern pattern printing or monochromatic coating is applied can be used. Alternatively, an overcoating step can be provided after adhering the decorative sheet. For the 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]

[Effect of device]

 Since the wood fiber layer 3 and the wood shaving layer 2a, 2b and other industrial materials are used as the core material, both the plate thickness and the surface smoothness are uniform materials, and the surface properties of the resulting laminated plate are excellent. There is.

Further, the wood fiber layer 3 and the wood shaving layers 2a and 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 into small pieces. It can also be an effective use of resources and prevent the destruction of nature.

Furthermore, by laminating the wood veneer layers 1a, 1b on the front and back sides so that the fiber directions of the wood veneer layers 2a, 2b laminated inside thereof are not parallel to each other. , The contraction and expansion due to moisture absorption and desorption are suppressed between the adjacent layers and become extremely small.

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 cut. Since the stability of the wood fiber layer 3 is added to the contraction / expansion suppressing action of the layers 2a and 2b, the laminated plate has further excellent dimensional stability. Further, by laminating the wood veneer layers 1a, 1b and the wood shaving layers 2a, 2b so that the fiber directions thereof are not parallel to each other, the mechanical strength can be improved.

[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)

[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.