JP2021115784A - Wood and method of producing wood - Google Patents

Abstract

To provide wood which is hardly cracked along a fiber direction when the wood is bent, and a method of producing the wood.SOLUTION: A wood 1 comprises: a base material 12 formed of a wooden material; and a surface material 13 which is provided on a surface 10 of the base material 12 and is formed of the wooden material while having a fixed fiber direction; and in which a groove 14 is formed on a rear surface 11 of the base material 12. In the wood, a longitudinal direction of the groove 14 is a direction along the fiber direction, and a shape of the groove 14 in a plane view has a wavy line shape, a zigzag shape, or a shape in which the wavy line shape and the zigzag shape are coexistent.SELECTED DRAWING: Figure 2

Description

The present invention relates to wood and a method for producing wood.

Conventionally, when bending a relatively thin wood having a length and a width longer than the thickness, for example, along a straight bending line as disclosed in Patent Document 1. It is bent.

Japanese Unexamined Patent Publication No. 7-9416

However, the wood utilizing such a conventional bending process has a risk of cracking along the fiber direction of the wood when the wood is bent.

Therefore, the present invention has been made in view of such a problem, and an object of the present invention is to provide a wood which is hard to break along the fiber direction when the wood is bent and a method for producing the wood.

The wood according to the uniform state of the present invention includes a base material made of a wood material and a surface material made of a wood material and having a constant fiber direction, which is provided on the surface of the base material, and has a groove on the back surface of the base material. The longitudinal direction of the groove is the direction along the fiber direction, and the shape of the groove in the plan view is a wavy line shape, a zigzag shape, or a mixture of a wavy line shape and a zigzag shape. The shape.

Further, the method for producing wood according to the uniform state of the present invention includes a step of providing a surface material made of wood material and having a constant fiber direction on the surface of a base material made of wood material, and forming a groove on the back surface of the base material. It is a method for producing wood including a step, and by irradiating the laser beam radiated to the back surface in a direction along the fiber direction, a wavy line shape, a zigzag shape, or a wavy line shape and a zigzag shape are mixed. The step of forming the groove of the shape is included.

According to the wood of the present invention and the method for producing wood, it is possible to prevent the wood from cracking along the fiber direction when the wood is bent.

It is a photograph which viewed the upper surface of the wood which concerns on Embodiment 1 in a plan view. It is sectional drawing of the wood which concerns on Embodiment 1. FIG. It is a photograph which viewed the lower surface of the wood which concerns on Embodiment 1 in a plan view. It is sectional drawing of the wood which concerns on Embodiment 2. FIG.

Hereinafter, embodiments will be described with reference to the drawings. It should be noted that all of the embodiments described below show comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, the order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. Further, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept are described as arbitrary components.

It should be noted that each figure is a schematic view and is not necessarily exactly shown. Further, in each figure, substantially the same configuration is designated by the same reference numerals, and duplicate description may be omitted or simplified.

(Embodiment 1)
[overview]
The wood 1 and the method for producing the wood 1 according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a plan view of the upper surface (surface) of the wood 1 according to the first embodiment, FIG. 2 is a cross-sectional view taken along the line AA of the wood 1, and FIG. It is a photograph of the back side) in a plan view.

[Explanation of wood 1]
As shown in these figures, the wood 1 according to the first embodiment includes a base material 12 having a front surface 10 and a back surface 11, and a surface material 13.

The surface material 13 is provided on the surface 10 of the base material 12. Although plywood is used as the base material 12 in the first embodiment, it may be a wood material, and may be wood, laminated wood, particle board, medium specific gravity fiber board, or the like. The surface material 13 uses a veneer in the first embodiment, but may be a veneer or a veneer as long as it is a wood-based material having a constant fiber direction B. The term "constant fiber direction" as used in the present disclosure means that the fiber directions B are substantially uniform, and it is not essential that the fiber directions B are completely the same. That is, "the fiber direction is constant" includes a mode in which the fiber directions B are completely the same and a mode in which the fiber directions B are not completely the same but are substantially the same. Therefore, the aspect in which one fiber direction B has an inclination of several degrees or more and 30 degrees or less with respect to the other fiber direction B is also included in "the fiber direction is constant".

The thickness of the wood 1 is, for example, 5.3 mm, of which the base material 12 is 5.0 mm and the surface material 13 is 0.3 mm, which can be appropriately designed according to the use of the building material to be used. ..

Further, a groove 14 is provided on the back surface 11 of the base material 12. The shape of the groove 14 is a wavy line shape as shown in FIG. 3, but it may be a zigzag shape. The longitudinal direction of the groove 14, that is, the direction in which the wavy pattern extends with respect to the amplitude direction in the wavy line, is the direction along the fiber direction B of the surface material 13 as shown in FIG. Here, even in the case of the zigzag shape, the longitudinal direction of the groove 14 means the direction in which the zigzag pattern extends with respect to the amplitude direction. The "direction along" as used in the present disclosure means that the directions are substantially parallel, and the mode in which the plurality of directions are completely parallel and the mode in which the plurality of directions are not completely parallel but are substantially parallel are ". Included in "Direction along". Therefore, an aspect in which one direction has an inclination of several degrees or more and 30 degrees or less with respect to the other direction is also included in the "direction along".

As described above, by making the shape of the groove 14 in a plan view into a wavy line shape or a zigzag shape, it is possible to obtain an effect that the surface material 13 is less likely to be cracked along the fiber direction B when the wood 1 is bent.

It is preferable that the groove 14 is not formed on the surface material 13 but is formed only on the base material 12.

As described above, since the groove 14 is not formed on the surface material 13, the groove 14 does not penetrate the wood 1, so that there is no risk of spoiling the appearance.

Further, it is preferable that the depth of the groove 14 is deeper in the central portion 16 than in the peripheral portion 15 of the wood 1.

By making the groove 14 of the central portion 16 deeper than the groove 14 of the peripheral portion 15 in this way, there is an effect that the wood 1 is easily bent along the groove 14 when it is bent.

The groove width when the groove 14 is viewed in a plan view becomes narrower in the depth direction. As shown in FIG. 2, the cross-sectional shape of the groove 14 is substantially triangular, but it may be a short shape such as a trapezoid or an arc shape.

In this way, when the groove 14 is viewed in a plan view, the groove width becomes narrower in the depth direction, so that when the wood 1 is bent, the surfaces of the groove 14 can be deformed so as to come into contact with each other. When the surfaces of the grooves 14 come into contact with each other, it prevents further bending and has the effect of preventing the wood from cracking due to an excessive bending force.

As shown in FIG. 3, the groove 14 is provided by connecting between one end 12a and the other end 12b of the surface 10, but the one end 12a and the other end 12b and the groove 14 are separated from each other. You may be.

As shown in FIG. 3, for example, 10 grooves 14 are formed, but one groove or a plurality of grooves 14 may be formed. When a plurality of grooves 14 are formed, the distance between the grooves 14 when the grooves 14 are viewed in a plan view is 2.2 mm, but it can be appropriately designed according to the use of the building material to be used.

Here, when the groove 14 is projected onto the surface material 13, the groove 14 preferably spans a plurality of fibers of the surface material 13, that is, a plurality of grain. The width of the groove 14 in a plan view is, for example, 100 microns or more and 1000 microns or less. Further, the minimum value of the wavy line-shaped amplitude or the zigzag-shaped amplitude in the plan view of the groove 14 is, for example, 300 microns. The maximum value is the width of the plate material (AA direction in FIG. 3). Here, the amplitude means the length from the central portion of the uppermost end to the central portion of the lowermost end of the groove 14.

By forming the groove 14 in this way, the stress applied to the wood 1 when the wood 1 is bent is dispersed, and the wood 1 is less likely to crack along the fiber direction B of the surface material 13.

The wood 1 is bent along the groove 14, and after processing, it is used as a building material such as a floor material, a wall material, a ceiling material, and a door.

When the wood 1 is used as a flooring material, a cushion material (not shown) or a veneer (not shown) may be provided on the back surface 11 depending on the intended use.

[Manufacturing method of wood 1]
Hereinafter, the method for producing the wood 1 according to the first embodiment will be described. First, the wood 1 including the base material 12 and the surface material 13 is prepared. The wood 1 can be formed, for example, by adhering the base material 12 and the surface material 13 with an adhesive.

First, the operator fixes the surface material 13 side to the fixing plate (not shown). Next, the operator irradiates the back surface 11 of the base material 12 with the focused laser beam generated by using the laser irradiation device (not shown) while moving it in a wavy line shape or a zigzag shape. This forms the groove 14. The laser beam irradiates the surface material 13 so as not to completely penetrate the surface material 13. When the wood 1 is irradiated with a laser beam, the light energy is converted into heat energy, and the processed portion of the wood 1 is instantly evaporated and removed to form the groove 14. By using the laser beam, fine processing, curved processing, discontinuous processing, processing in which straight lines and curved lines are mixed, and the like are possible, and a groove 14 having a predetermined depth can be easily formed in wood. After irradiation with the laser beam, wood 1 as shown in FIG. 3 is obtained.

Laser processing may cause discoloration of the groove 14 of wood 1 and its surroundings due to burning and reattachment of evaporated components, but laser processing does not appear on the surface of wood 1 in the state of use by the user. Since it is applied to the back surface 11 of the above, the appearance is not easily spoiled.

As the laser beam, for example, a carbon dioxide gas laser in an infrared wavelength region having a high absorption rate of a wood-based material which is a material of wood 1 is used, but if a groove 14 can be formed in the base material 12, a suitable laser beam may be appropriately selected. Of course it is good.

Here, when a carbon dioxide gas laser is used, the reflection and transmission of the laser beam in the wood 1 are reduced, and the efficiency of laser processing is improved.

It is preferable to cool the surface material 13 during the irradiation of the laser beam. That is, when forming the groove 14, it is preferable to laser-process the wood 1 while cooling the surface material 13. It is preferable that at least the portion corresponding to the portion of the surface material 13 when the groove 14 of the base material 12 is projected onto the surface material 13 is cooled.

Examples of the method for cooling the surface material 13 include a method in which the surface material 13 is brought into contact with a cooling plate (not shown) and a method in which cold air is blown onto the surface material 13. After irradiating the laser beam, cooling is stopped, and wood 1 as shown in FIG. 3 is obtained.

As the cooling plate, the above-mentioned fixed plate is provided with a cooling function, and examples thereof include a copper plate and a water-cooled heat radiating plate.

As described above, since the surface material 13 is cooled during the laser beam irradiation, the temperature of the surface material 13 is less likely to rise, and the surface material 13 is less likely to be laser-processed.

[Effects, etc.]
By making the shape of the groove 14 provided on the back surface 11 of the base material 12 in a plan view into a wavy line shape or a zigzag shape, it becomes difficult to crack along the fiber direction B of the surface material 13 when the wood 1 is bent.

(Embodiment 2)
The wood 2 and the method for producing the wood 2 according to the second embodiment will be described with reference to FIG. The method for producing the wood 2 and the wood 2 according to the second embodiment is the same as the method for producing the wood 1 and the wood 1 according to the first embodiment, except that the wood 2 is provided with the protective material 20. Therefore, the description of common points will be omitted. FIG. 4 is a cross-sectional view taken along the line AA corresponding to FIG. 1 of the wood 2 according to the second embodiment.

As shown in FIG. 4, the wood 2 includes a base material 12 having a front surface 10 and a back surface 11, a surface material 13, and a protective material 20. The protective material 20 is provided between the base material 12 and the surface material 13.

The protective material 20 is less likely to be laser-processed than the base material 12. Therefore, when irradiating the back surface 11 of the base material 12 with the laser beam, the laser beam can be easily stopped at the boundary between the base material 12 and the protective material 20, so that the laser beam does not penetrate the surface material 13 and forms the groove 14. Can be formed. Further, a groove 14 having a constant depth can be formed.

The protective material 20 may be a material that is less likely to be laser-processed than the base material 12, and examples thereof include a metal. As the metal, aluminum, which has a relatively high reflectance of the laser beam and is inexpensive, is preferable among the metals, but copper, iron, and the like may also be used.

In FIG. 4, the protective material 20 is provided on the entire surface between the base material 12 and the surface material 13, but it is sufficient that the protective material 20 is provided at least at a position where the groove 14 is projected onto the surface material 13.
The thickness of the protective material 20 is, for example, 0.01 mm, but it can be appropriately designed according to the use of the building material to be used.

[Manufacturing method of wood 2]
Hereinafter, the method for producing the wood 2 according to the second embodiment will be described. First, a wood 2 including a base material 12, a surface material 13, and a protective material 20 is prepared. The wood 2 can be formed, for example, by adhering the base material 12, the surface material 13, and the protective material 20 with an adhesive.
Next, the operator irradiates the back surface 11 of the base material 12 with the focused laser beam generated by using the laser irradiation device (not shown) while moving it in a wavy line shape or a zigzag shape. This forms the groove 14.

By cooling the surface material 13 during the irradiation of the laser beam, the protective material 20 can also be cooled. That is, when forming the groove 14, it is preferable to laser-process the wood 2 while cooling the surface material 13. It is preferable that at least the portion of the surface material 13 that overlaps the portion of the base material 12 that forms the groove 14 is cooled.

As described above, since the protective material 20 is cooled during the laser beam irradiation, the temperature of the protective material 20 is less likely to rise, and the protective material 20 is less likely to be laser-processed.

[effect]
By providing the protective material 20, the groove 14 can be formed without the laser beam penetrating the surface material 13. Further, a groove 14 having a constant depth can be formed.

1, 2 Wood 10 Front surface 11 Back surface 12 Base material 12a One end 12b Other end 13 Surface material 14 Groove 15 Peripheral part 16 Central part 20 Protective material

Claims (6)

A base material made of wood-based material and
A surface material provided on the surface of the base material, which is made of a wood material and has a constant fiber direction, is provided.
A wood having grooves formed on the back surface of the base material.
The longitudinal direction of the groove is a direction along the fiber direction.
The shape of the groove in a plan view is a wavy line shape, a zigzag shape, or a wood in which a wavy line shape and a zigzag shape are mixed. The width of the groove in a plan view is 100 microns or more and 1000 microns or less.
The wood according to claim 1, wherein the wavy line amplitude or the zigzag shape amplitude is 300 microns or more and not more than the plate width of the base material. The wood according to claim 1 or 2, wherein the width of the groove in a plan view is narrowed in the depth direction. The wood according to any one of claims 1 to 3, wherein a protective material that is less likely to be laser-processed than the base material is provided between the base material and the surface material. The wood according to any one of claims 1 to 4, wherein the depth of the groove is deeper in the central portion of the back surface than in the peripheral portion of the back surface. A method for producing wood, which comprises a step of providing a surface material made of wood-based material and having a constant fiber direction on the surface of a base material made of wood-based material, and a step of forming grooves on the back surface of the base material.
Wood including a step of forming the groove having a wavy line shape, a zigzag shape, or a shape in which a wavy line shape and a zigzag shape are mixed by irradiating the laser beam irradiated to the back surface in a direction along the fiber direction. Manufacturing method.

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