JP6524328B1 - Wood member and method of manufacturing the same - Google Patents

Abstract

[PROBLEMS] To provide a wood member which can reduce the difference in lightness and darkness of early and late woods and which is excellent in appearance, and a method for producing the same. SOLUTION: A wood member is applied to one side 3 of a wood 2 having a plurality of grooves 6 which are recessed toward the inside and a plurality of grooves 6 arranged at intervals in the surface direction and a wood 6 including the grooves 6 And the protected wood protective layer 20. The lower limit D1 of the depth of the groove 6 is 20 μm or more. The upper limit D2 of the depth of the groove 6 is 900 μm or less. The number of grooves 6 in a unit area is 500 / cm 2 or more and 8000 / cm 2 or less. [Selected figure] Figure 1

Description

  The present invention relates to a wooden member and a method of manufacturing the same.

  Heretofore, there has been known an insizing process in which a plurality of perforations are made on the surface of wood before the resin is applied in order to increase the permeability of the resin into the wood.

  For example, it has been proposed to drill the surface of the wood to form a hole with an average depth of about 3.5 mm and then apply the resin to the surface of the wood including the hole ( See, for example, Non-Patent Document 1.).

  The resin is usually toned according to the use and purpose.

Journal of the Wood Science Society Vol. No. 1, p28-35 (2018)

  However, wood includes early wood (spring wood) which is a coarse wood part and late wood (autumn wood) which is a dense wood part. The early wood is darker in color than the late wood because the resin is more likely to penetrate because the material is rougher than the late wood. Therefore, on the surface of the wood after application, it becomes thick with early wood and thin with late wood. That is, on the surface of wood, shades of color occur.

  It is required to reduce the difference in density to obtain an excellent appearance.

  However, in the method described in Non-Patent Document 1, the above-described shading becomes excessively large, and thus there is a problem that an excellent appearance can not be secured.

  The present invention provides a wood member which can reduce differences in lightness and darkness of early and late woods and is excellent in appearance, and a method for producing the same.

The present invention (1) is a wood having on its surface a plurality of grooves recessed toward the inside and spaced apart from each other in the surface direction, and a wood protective layer applied to the surface of the wood including the grooves. The lower limit of the depth of the groove is 20 μm or more, the upper limit of the depth of the groove is 900 μm or less, and the number of the grooves in a unit area is 500 / cm ² or more and 8000 / cm. ² or less, including wood members.

This invention (2) includes the woody member as described in (1) whose mass of the said wood protection layer in unit area is 35 g / m < ² > or more and 300 g / m < ² > or less.

  The present invention (3) includes the woody member according to (1) or (2), further comprising a surface coating layer applied to the surface of the wood including the grooves and / or the surface of the wood protective layer.

In the present invention (4), a first step of forming a plurality of grooves so as to be recessed inwardly and spaced from each other in the plane direction by irradiating the surface of wood with an ultraviolet laser, and for wood parts A second step of forming a wood protective layer on the surface of the wood including the groove by applying a paint to the surface of the wood including the groove, the lower limit of the depth of the groove being 20 μm It is the above, The upper limit of the depth of the groove is 900 micrometers or less, and the number of the grooves in a unit area is 500 pieces / cm ² or more and 8000 pieces / cm ² or less. .

  The present invention (5) further comprises a third step of applying a treatment paint to the surface of the wood including the grooves and / or the surface of the wood protective layer, according to (4). Including.

  This invention (6) includes the manufacturing method of the wooden member as described in (4) or (5) which apply | coats the said paint for wood parts in the said 2nd process in multiple times.

  In the wood member of the present invention and the method for manufacturing the same, the upper limit of the depth of the groove is as shallow as 900 μm or less, so excessive penetration of the paint for wood part applied to the groove can be suppressed. Therefore, the difference in density in the wood member can be reduced.

Moreover, since the number of grooves in a unit area is 8000 pieces / cm ² or less, excessive penetration of the paint for wood parts applied to the grooves can be effectively suppressed. Therefore, the difference in density in the wood member can be further reduced.

  As a result, the wood member is excellent in appearance.

  In particular, according to the method for producing a wood member of the present invention, since the ultraviolet laser is irradiated to the surface of wood, generation of burnt on the surface of wood can be suppressed. Therefore, the appearance is more excellent.

In addition, the lower limit of the depth of the grooves is 20 μm or more, and the number of grooves in a unit area is 500 pieces / cm ² or more. Therefore, the wood protective effect based on the wood protective layer can be sufficiently exhibited.

1A to 1C are process drawings for explaining an embodiment of a wood member of the present invention and a method for producing the same, wherein FIG. 1A is a step of preparing wood and FIG. 1B is a step of forming a groove on one side of wood. FIG. 1C shows a step of applying a wood part paint on one side to form a wood protective layer.

  One embodiment of a wooden member of the present invention and a method of manufacturing the same will be described with reference to FIGS. 1A to 1C.

  As shown in FIG. 1C, the wood member 1 includes a wood 2 and a wood protective layer 20.

  The wood 2 is, for example, a plate material (plate) having one surface 3 and the other surface (not shown in FIG. 1C) facing each other at an interval in the thickness direction. One side 3 is an example of the surface of wood 2.

  Wood 2 includes early wood (spring wood) 4 and late wood (autumn wood) 5. The quickwood 4 is a wood part whose material is coarse. The latewood 5 is a dense wood part made of a material, and more specifically, is denser than the earlywood 4. In addition, on one side 3 of the wood 2, the early wood 4 and the late wood 5 are exposed toward one side in the thickness direction. That is, when looking at one side 3 of the wood 2 from one side in the thickness direction, the early wood 4 and the late wood 5 are visually recognized. In addition, although not shown in figure, in one side 3 of the wood 2, the early wood 4 and the late wood 5 are alternately arrange | positioned normally. One early wood 4 and one late wood 5 form one annual ring (wood formed in one year).

  One surface 3 has a flat surface 16 and a groove 6 recessed toward the inside.

  The flat surface 16 is a flat surface (main surface) disposed on one side in the thickness direction on the one surface 3. The flat surface 16 is continuous in the surface direction.

  The groove 6 is a recess which is recessed from the flat surface 16 of the wood 2 toward the other side in the thickness direction. Specifically, the groove 6 is a round hole cut out from the flat surface 16 into a substantially cylindrical shape. The groove 6 has, for example, a substantially circular shape in plan view.

  Specifically, the groove 6 is sectioned (formed) by a bottom surface 9 and an inner side surface 10 extending from the peripheral edge of the bottom surface 9 to one side in the thickness direction.

  The bottom surface 9 has, for example, a substantially circular shape in plan view.

  The inner surface 10 is orthogonal to, for example, one surface 3 of the wood 2. Further, in the cut surface in which the groove 6 is cut along the thickness direction, the two inner side surfaces 10 are parallel to each other. One end in the thickness direction of the inner surface 10 is continuous with the flat surface 16.

  The groove 6 is, for example, a laser groove (ultraviolet laser groove) formed by irradiating an ultraviolet laser to one surface 3 of the wood 2 as described in the later manufacturing method.

  Further, a plurality of the grooves 6 are arranged at intervals in the direction along the flat surface 16 (the surface direction and the direction orthogonal to the thickness direction). The plurality of grooves 6 include a plurality of first grooves 7 formed in the quickwood 4 and a plurality of second grooves 8 formed in the late material 5.

  The first groove 7 is a deep groove recessed from the flat surface 16 of the quickwood 4 toward the other side in the thickness direction. The depth D2 of the first groove 7 is a length in the thickness direction from the flat surface 16 to the bottom surface 9 of the quickwood 4, and specific numerical values will be described in detail in the depth of the groove 6 (described later).

  The second groove 8 is a shallow groove which is recessed from the flat surface 16 of the night material 5 toward the other side in the thickness direction and is shallower than the first groove 7. The depth D1 of the second groove 8 is the distance from the flat surface 16 to the bottom surface 9 of the night material 5, and specific numerical values will be described in detail in the depth of the groove 6 (described later).

  The plurality of grooves 6 includes grooves having various depths. Thus, the depth of the groove 6 is represented (shown) by a range. The depth of the shallowest groove among the plurality of grooves 6 is the lower limit D1 (described later) of the depth of the groove 6, and the deepest groove depth is the upper limit D2 (described later) of the depth of the grooves 6 Become.

  The lower limit D1 of the depth of the groove 6 is 20 μm or more, and the upper limit D2 of the depth of the groove 6 is 900 μm or less.

  Specifically, the plurality of grooves 6 include a shallow second groove 8 and a deep first groove 7, and the plurality of second grooves 8 also include grooves having various depths, and The first groove 7 also comprises grooves having various depths. The depth of the deepest groove in the first groove 7 corresponds to the upper limit D2 of the depth of the groove 6, and the depth of the shallowest groove in the second groove 8 is the depth of the groove 6 It corresponds to the lower limit D1.

  If the lower limit D1 of the depth of the groove 6 (the depth of the shallowest groove among the second grooves 8) is less than 20 μm, the wood protection effect based on the wood protective layer 20 described below can not be sufficiently exhibited. .

  On the other hand, if the upper limit D2 of the depth of the groove 6 (the depth of the deepest groove in the first groove 7) exceeds 900 μm, excessive penetration of the paint for wood for the groove 6 can not be suppressed. The difference in density in the wood member 1 can not be reduced.

  The lower limit D1 of the depth of the groove 6 is preferably 25 μm or more, more preferably 30 μm or more, and still more preferably 50 μm or more. If the lower limit D1 of the depth of the grooves 6 is equal to or more than the above, it is possible to sufficiently exhibit the wood protection effect based on the wood protection layer 20.

  The upper limit D2 of the depth of the groove 6 is preferably 800 μm or less, more preferably 750 μm or less, still more preferably 700 μm or less, particularly preferably 600 μm or less, further 500 μm or less, furthermore 450 μm or less, further Is preferably 400 μm or less, and more preferably 350 μm or less. If the upper limit D2 of the depth of the groove 6 is equal to or less than the above, excessive penetration of the paint for wood part applied to the groove 6 can be suppressed, and the difference in density of the wood member 1 can be reduced.

  The depth (D1, D2) of the groove 6 is determined by an X-ray microscope. The measurement method is described in the later examples.

The number of grooves 6 in a unit area is 500 pieces / cm ² or more, preferably 1000 pieces / cm ² or more, and 8000 pieces / cm ² or less, preferably 5000 pieces / cm ² or less .

  If the number of grooves 6 in a unit area is below the above-described lower limit, the wood protective effect based on the wood protective layer 20 can not be sufficiently exhibited.

  On the other hand, if the number of grooves 6 in a unit area exceeds the above-described upper limit, excessive penetration of the paint for wood parts applied to the grooves 6 can not be effectively suppressed.

  The number of grooves 6 in a unit area is measured (measured) by microscopic observation. Moreover, it can also be preset in the conditions of the 1st process mentioned later.

  The pattern of the plurality of grooves 6 is not particularly limited, and in plan view, for example, a pattern aligned in the vertical and horizontal directions, a pattern aligned in a staggered manner, and the like can be mentioned.

  The average of the maximum length L1 in the surface direction of the groove 6 (inner diameter if the groove 6 is generally circular in plan view) is, for example, 20 μm or more, and for example, 100 μm or less, preferably 50 μm or less It is.

  The length (shortest distance) L2 between the grooves 6 adjacent to each other is, for example, 50 μm or more, preferably 100 μm or more, and for example, 500 μm or less, preferably 250 μm or less.

  The woods constituting the wood 2 are not particularly limited, and various tree species such as beech, nara, cedar, macaba, beach, oak, teak, hard maple, cherry, walnut, white ash, mahogany, pine, hiba, cypress, etc. It can be mentioned. The wood 2 may be any of veneer and plywood.

  The wood protective layer 20 is a protective layer that protects one surface 3 of the wood 2 including the plurality of grooves 6 from external objects (eg, dust, water, etc.) and irritation (eg, ultraviolet light, etc.).

  The wood protective layer 20 is an application layer formed by applying a paint for wood part to one surface 3 of the wood 2 including the plurality of grooves 6.

  In addition, the wood protective layer 20 is one in which the paint for wood part penetrates into the wood 2 from one surface 3. The wood protective layer 20 in which the paint for wood part has penetrated by the application of paint for wood part to the first groove 7 is the wood protection in which the paint for wood part has penetrated by application of the paint for wood part to the second groove 8 Thick compared to layer 20.

  Furthermore, the wood protective layer 20 may be laminated on one surface 3 (including the bottom surface 9 and the inner surface 10).

The weight of the wood protective layer 20 in a unit area is, for example, 35 g / m ² or more, preferably 40 g / m ² or more, more preferably 75 g / m ² or more, and for example, 300 g / m ² or less. Preferably, it is 250 g / m ² or less, more preferably 200 g / m ² or less, still more preferably 185 g / m ² or less, particularly preferably 175 g / m ² or less, most preferably 150 g / m ² or less .

  If the mass of the wood protection layer 20 in a unit area is the above-mentioned minimum or more, the wood protection effect based on the wood protection layer 20 can fully be exhibited.

  On the other hand, if the mass of the wood protective layer 20 in a unit area is below the above-mentioned upper limit, the difference of lightness and darkness can be made small.

  Next, a method of manufacturing the wood member 1 will be described.

  As shown in FIG. 1A, first, for example, a wood 2 having a flat one surface 3 is prepared. One side 3 of this wood 2 comprises only a flat side 16. At this point in the wood 2, the grooves 6 are not yet formed (that is, a plate (plate) in which the grooves 6 are not yet formed is prepared as the wood 2). The smoothness of one surface 3 can be enhanced by processing (surface cutting) the one surface 3 with a plane machine or the like.

  Next, as shown in FIG. 1B, an ultraviolet laser is applied to one surface 3 of the wood 2 (first step).

  First, for example, although not shown, a groove forming device including a moving device and an irradiation device is prepared.

  The moving device is equipped with a control device (such as a galvano scanner). Moreover, a movement apparatus is provided with a drive source, and can move an irradiation apparatus to the surface direction of the wood 2 based on the driving force of a drive source.

  The irradiation apparatus includes an ultraviolet laser irradiation unit capable of irradiation. Specifically, the ultraviolet laser irradiation unit can irradiate the ultraviolet laser by a pulse based on an excitation method such as laser diode (LD) excitation, for example. The pulses are obtained at high power, for example by means of a Q-switch.

  The above-described groove forming apparatus is not particularly limited, and is appropriately selected from, for example, the devices described in Non-Patent Document 1 described above.

  The wood 2 is installed in the above-described groove forming device such that the one surface 3 of the wood 2 faces the irradiation device.

  Next, the ultraviolet laser is irradiated to the one surface 3 of the wood 2 while scanning the irradiation device in the surface direction based on the driving of the moving device by the control of the control device.

As the irradiation conditions, the lower limit D1 of the groove 6 is at least 20 μm or more, the upper limit D2 of the depth of the groove 6 is at least 900 μm or less, and the number of grooves 6 in a unit area is 500 / cm ² or more and 8000 / cm ² It is set to be as follows.

  Specifically, the wavelength of the ultraviolet laser is, for example, 200 nm or more, preferably 300 nm or more, and for example, 400 nm or less, preferably 380 nm or less.

  One pulse energy is, for example, 10 μJ or more, preferably 100 μJ or more, and for example, 500 μJ or less.

  The pulse width is, for example, 1 ns or more, preferably 5 ns or more, and for example, 50 ns or less, preferably 25 ns or less.

  Further, in order to form one groove 6, the ultraviolet laser can be irradiated once, or can be irradiated to the same groove 6 multiple times (multiple pulses). The number of times of irradiation is appropriately set according to the degree of density of the material of the tree species.

  Thereby, a plurality of grooves 6 are formed on one surface 3 of the wood 2.

  Thereafter, as shown in FIG. 1C, a paint for wood part is applied to one surface 3 of the wood 2 including the grooves 6 (second step).

  The paint for wood part is not particularly limited, and contains, for example, an active ingredient (antiseptic, antifungal agent, etc.), a toning ingredient, a film forming ingredient (including a water repellent ingredient), a solvent and the like. Examples of such wood paint are known wood paint. Moreover, the paint for wood parts can use a commercial item, for example, Xyla de coal interior fine (made by Osaka Gas Chemical Co., Ltd.), Conzoran series (made by Osaka Gas Chemical Co., Ltd.), water-based VATON series (made by Otani paint company) etc. The aqueous wood part paint of the present invention is used, for example, oil based wood part paint such as oil-based xyla decal series (manufactured by Osaka Gas Chemical Co., Ltd.) and VATON series (manufactured by Otani paint company). Moreover, as a paint for wood parts, the wood protection paint which conforms to the Japan Institute of Building material standard "JASS 18M-307" is also suitable.

  The coating method is not particularly limited, and examples thereof include brush coating, spatula coating, and a spray coating method. Preferably, brushing is mentioned.

The number of times of application is not particularly limited. It may be either once or multiple times. From the viewpoint of setting the mass of the wood protective layer 20 in the above-described range (specifically, a high value of 35 g / m ² or more), a plurality of times are preferable. If the number of times of application is multiple times, the wood protective layer 20 having a large mass can be formed.

  In addition, the applied paint for wood parts penetrates into the interior of the wood 2 from one side 3.

  Then, if necessary, cure at room temperature (20 ° C.). By this, the solvent of the paint for wood part is removed.

  Thereby, the wood protective layer 20 is formed on the one surface 3 including the groove 6.

  And in the wooden member 1 of this embodiment and its manufacturing method, since the upper limit D2 of the depth of the groove 6 is as shallow as 900 μm or less, excessive penetration of the paint for wood part applied to the groove 6 can be suppressed. Therefore, the difference in density in the wood member 1 can be reduced.

Moreover, since the number of grooves 6 in a unit area is 8000 pieces / cm ² or less, excessive penetration of the paint for wood parts applied to the grooves 6 can be effectively suppressed. Therefore, the difference in density in the wood member 1 can be further reduced.

  As a result, the wood member 1 is excellent in appearance.

  In particular, according to the method of manufacturing the wood member 1, since the ultraviolet laser is irradiated to the one surface 3 of the wood 2, the generation of the burnt on the one surface 3 of the wood 2 can be suppressed. Therefore, the appearance is more excellent.

In addition, the lower limit D1 of the depth of the groove 6 is 20 μm or more, and the number of grooves 6 in a unit area is 500 pieces / cm ² or more. Can.

Furthermore, if the mass of the wood protection layer 20 in a unit area is 35 g / m ² or more, the wood protection effect based on the wood protection layer 20 can be sufficiently exhibited. On the other hand, if the mass of the wood protective layer 20 in a unit area is 300 g / m ² or less, the difference in density can be reduced.

  Moreover, if the paint for wood parts is applied multiple times in the second step, the mass of the wood protective layer 20 in a unit area can be easily set in the above-mentioned range.

  Note that a wood member 1 comprising a wood 2 not having the grooves 6 (for example, the wood 2 shown in FIG. 1A) and a wood protective layer 20 formed by applying a paint for wood part to the wood 2; Comparing the wood member 1 shown in FIG. 1C with the wood 2 having the grooves 6 and the wood protective layer 20 formed by applying the paint for wood part to the wood 2, the weather resistance (for example, water repellency) It is needless to say that the latter is much more excellent in weatherability evaluated by aqueous solution.

Modifications In the following modifications, the detailed description of the same components and steps as those of the above-described embodiment will be omitted. In addition, each modification exhibits the same function and effect as that of the embodiment except for the special mention.

  As shown by phantom lines in FIG. 1C, the wood member 1 can further include a primer layer 15 as an example of a surface coating layer.

  The undercoating layer 15 is, for example, after forming the grooves 6 and before applying the paint for wood part to the one surface 3 of the wood 2, It forms by apply | coating to one side 3 (3rd process). The undercoat paint (clear paint) contains, for example, an acrylic resin, an alkyd resin, a polyester resin, a polyurethane resin, an epoxy resin, a silicone resin, a resin such as a fluorine resin, and an organic solvent.

  If the wood member 1 further includes the undercoat layer 15, the difference in density can be further reduced.

  Further, as shown by phantom lines in FIG. 1C, the wood member 1 can further include an overcoat layer 17 as an example of a surface coating layer. The top coat layer 17 is formed by applying a top coat as an example of a processing paint to the surface of the wood protective layer 20. The top coat contains, for example, the above-described resin and an organic solvent.

  If the wood member 1 further includes the top coat layer 17, the difference in density can be further reduced.

  Alternatively, the wood member 1 can be provided with both the primer layer 15 and the overcoat layer 17.

  In one embodiment, the grooves 6 are formed only on one side 3 but can be formed on both sides of one side 3 and the other side (not shown).

  In one embodiment, although wood 2 is explained as a board, it is not limited to this, for example, a log etc. may be sufficient.

  In one embodiment, the planar view shape of the groove 6 is not particularly limited, and may be, for example, a substantially polygonal shape in plan view (for example, a substantially rectangular shape).

In one embodiment, although the groove 6 in the wood member 1 is described as an ultraviolet laser groove formed by irradiating an ultraviolet laser to one surface 3 of the wood 2, a short pulse CO ₂ laser is used for the wood 2. It may be a short pulse CO ₂ laser groove formed by irradiating one surface 3.

  Furthermore, the groove 6 may be, for example, a perforated groove by a method (for example, needle processing) by physical cutting.

  Specific numerical values such as the number of compounding parts (content ratio), physical property values, parameters and the like used in the following description are the number of compounding parts (content ratio) corresponding to them described in the above-mentioned "Mode for Carrying Out the Invention" ), Physical property values, parameters, etc. may be substituted for the upper limit (numerical values defined as “below”, “less than”) or lower limit (numerical values defined as “above”, “exceed”), etc. it can.

Example 1
As shown in FIG. 1A, at first, an air-dried cedar core grain of lumber having one surface 3 finished flat and flat was prepared as a wood 2.

  Then, using a LD-pumped Q-switched solid laser (TALON-355-15SH, manufactured by Spectra-Physics) equipped with a galvano scanner (YD-200-OP, manufactured by Y. DATA Corporation) under the conditions shown below An ultraviolet laser was applied to one side 3 of the wood 2.

Wavelength 355 nm
Pulse width 12 ns
Pulse energy 240μJ
At this time, a dispersive irradiation method was employed in which the laser was continuously pulse-oscillated while scanning the galvano scanner continuously without stopping every groove 6. Further, in the above-described apparatus, the scanning speed and the like were set such that the number of grooves 6 formed was as described in Table 1.

  As shown in FIG. 1B, thereby, a plurality of grooves 6 were formed on one surface 3 of the wood 2.

  Then, the paint for brownish wood parts (commercial item, solid content concentration 27.5 mass%) conforming to the Japan Institute of Building Material standard "JASS 18M-307" is applied to one side 3 of the wood 2 five times with a brush Yes (brushed).

  This formed a wood protective layer 20, as shown in FIG. 1C. Thereafter, wood 2 was aged for 1 week at normal temperature (20 ° C.).

Examples 2 to 15 and Comparative Example 1
Example except that manufacturing conditions (the depth of groove 6, the number of grooves 6 in unit area, the number of times of application of paint for wood part, the mass of wood protective layer 20 in unit area, etc.) are changed according to Table 1-Table 2. Treated as in 1.

Example 16
After forming a plurality of grooves 6 on one side 3 of the wood 2, before applying the paint for wood part to the wood 2, a colorless and transparent primer which conforms to the material standards "JASS 18M-307" of the Architectural Institute of Japan A paint (commercially available, solid concentration 18% by mass) is applied by brush once to one side 3 of the wood 2 (brushed) to form the undercoat layer 15 as shown by the phantom line in FIG. 1C. The same processing as in Example 1 was carried out except for the above.

<Evaluation>
The following items were evaluated. The results are shown in Tables 1 to 3.

Depth The lower limit D1 and the upper limit D2 of the depth of the groove 6 were determined by an X-ray microscope and an image analyzer. Details of the measurement and analysis are as follows.
X-ray microscope nano3DX (made by RIGAKU Co., Ltd.)
Tube voltage 40kV
Tube current 30mA
X-ray target Copper image analyzer Image processing software Image J

Mass of wood protective layer From the mass difference before application and immediately after application, the mass of paint for wood part per unit area (including the data of solid content and solvent) is determined, and the solid content concentration (27.5 mass%) The mass of the wood protective layer 20 in a unit area was determined by dividing by.

Weight of undercoat layer From the mass difference before and after application, find the mass (including the solid content and solvent data) of the undercoat paint per unit area, and divide by the solid concentration (18% by mass). The mass of the undercoat layer 15 in a unit area was determined by

Difference of light and shade of wood member 1 of each example and comparative example, black panel temperature 63 ° C, 120 minutes cycle (102 minutes irradiation) using Xenon weather meter (made by Atlas company) according to JIS K 5600-7-7 Accelerated weathering tests were then carried out for up to 1000 hours under conditions of irradiation and spraying for 18 minutes.

  Thereafter, the wood member 1 was cured under an atmosphere of 20 ° C. and 65% RH.

Then, the difference of the lightness and darkness in the early wood 4 and the late wood 5 in the wood member 1 was visually evaluated according to the following standard.
◎: The difference in density between late wood 4 and early wood 5 was extremely minute.
○: difference in density between late wood 4 and early wood 5 was extremely small.
Fair: difference in density between late wood 4 and early wood 5 was very small.
X: The difference in density between late lumber 4 and early lumber 5 was excessive.

Evaluation of Water Repellency About 1 g of distilled water was dropped onto one surface 3 of wood 2, and after standing for 1 minute, water droplets were wiped off, and the water repellency was determined by the following formula from the amount of dripping and the amount of penetration.

Water repellency (%) = (1-penetration amount / dripping amount) x 100
In addition, when the percentage of water repellency is high, more specifically, when it is close to 100%, the lumber protection effect on the one surface 3 of the lumber 2 of the lumber protective layer 20 is sufficiently exhibited. Show.

1 wood member 2 wood 3 one side 6 groove 15 primer layer (an example of a surface coating layer)
17 Top coat layer (example of surface coating layer)
20 Wood Protective Layer D1 Lower limit of groove depth D2 Upper limit of groove depth

Claims (6)

Wood having concaves toward the inside and grooves provided at a plurality of intervals in the surface direction on the surface;
And a wood protective layer applied to the surface of the wood including the grooves.
The depth of the shallowest groove is 20 μm or more, and the depth of the deepest groove is 900 μm or less.
A wood member, wherein the number of grooves in a unit area is 500 / cm ² or more and 8000 / cm ² or less. The weight of the said wood protection layer in unit area is 35 g / m < ² > or more and 300 g / m < ² > or less, The wood member of Claim 1 characterized by the above-mentioned.   The wood member according to claim 1 or 2, further comprising a surface coating layer applied to the surface of the wood including the grooves and / or the surface of the wood protective layer. A first step of irradiating the surface of the wood with an ultraviolet laser to form a plurality of grooves so as to be recessed inwardly and spaced from each other in the surface direction;
A second step of forming a wood protective layer on the surface of the wood including the groove by applying a paint for wood part to the surface of the wood including the groove,
The depth of the shallowest groove is 20 μm or more, and the depth of the deepest groove is 900 μm or less.
The manufacturing method of a wood member, wherein the number of the grooves in a unit area is 500 / cm ² or more and 8000 / cm ² or less.   The method for producing a woody member according to claim 4, further comprising a third step of applying a treatment paint to the surface of the wood including the grooves and / or the surface of a wood protective layer. The method for producing a woody member according to claim 4, wherein the paint for wood part is applied a plurality of times in the second step.

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