Wood for chemical treatment and method for manufacturing chemically treated wood

Abstract

This method facilitates the impregnation of wood with chemicals used in wood treatment while maintaining the aesthetic appeal of the wood's surface. [Solution] The wood 20 for chemical treatment has a surface portion 21 that comes into contact with the chemicals used in the chemical treatment of the wood, and a plurality of holes 22 that open in the surface portion 21. The visible light reflectance of the surface portion 21 of the wood 20 is 90 to 100% of the visible light reflectance of the surface portion 21 before the formation of the plurality of holes 22.

Description

[Technical Field]

[0001] The present invention relates to chemically treated wood that is impregnated with chemicals used in the chemical treatment of wood, and to a method for producing chemically treated wood from chemically treated wood. [Background technology]

[0002] Wood used in construction requires durability to withstand long-term use, and, due to its nature as wood, it must also be resistant to decay caused by fungi and insect damage such as termites. In contrast, chemically treated wood is sometimes used as a building material. Chemically treated wood is produced by impregnating the raw wood with chemicals used in the treatment, thereby enhancing its durability. In this process, multiple pores are formed in the raw wood, making it easier for the chemicals to penetrate the wood and shortening the time required for the chemicals to penetrate into the interior of the wood. In chemically treated wood with multiple pores, the pores are formed on the surface of the wood.

[0003] To enhance the penetration of chemicals from the surface of the wood, wood-based members with multiple grooves spaced apart from each other are known (see Patent Document 1). In the conventional wood-based member described in Patent Document 1, the upper limit of the groove depth is set to 900 μm to suppress excessive penetration of the wood coating applied to the grooves, thereby reducing the difference in shade on the wood-based member. However, regarding multiple grooves, the number of grooves per unit area is 500 / cm². 2 More than 8000 pieces / cm 2 As described below, the large number of grooves may result in multiple grooves being noticeable on the surface of the wood. Therefore, in conventional wood-based materials, there is concern that this may affect the appearance of the wood, and there is room for improvement from the perspective of ensuring the aesthetic appeal of the surface of the wood. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Patent No. 6524328 [Overview of the project] [Problems that the invention aims to solve]

[0005] The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to facilitate the impregnation of wood with chemicals used in the chemical treatment of wood, while ensuring the aesthetic appeal of the surface of the wood. [Means for solving the problem]

[0006] The present invention A piece of wood for chemical treatment having a surface that comes into contact with chemicals used in the chemical treatment of wood, and a plurality of pores opening in the surface, This is wood for chemical treatment in which the visible light reflectance of the surface portion is 90 to 100% of the visible light reflectance of the surface portion before the formation of the plurality of pores. Furthermore, the present invention is The process for producing wood for chemical treatment according to the present invention, A step of impregnating the wood for chemical treatment with the aforementioned chemical agent and subjecting the wood for chemical treatment to chemical treatment in order to produce chemically treated wood, This is a method for producing chemically treated wood that has [specific properties]. [Effects of the Invention]

[0007] According to the present invention, it is possible to make it easier to impregnate wood with chemicals used in the chemical treatment of wood while ensuring the aesthetic appeal of the wood surface. [Brief explanation of the drawing]

[0008] [Figure 1] This flowchart shows the manufacturing procedure for chemically treated wood according to this embodiment. [Figure 2] This is a diagram showing the insizing device of this embodiment. [Figure 3] This is a plan view showing the wood used for chemical treatment in this embodiment. [Figure 4] This is a diagram showing the drug impregnation apparatus of this embodiment. [Figure 5] This graph shows the relationship between the visible light reflectance maintenance rate of the surface and the density of multiple pores when the wood is cypress. [Figure 6] This graph shows the relationship between the visible light reflectance maintenance rate of the surface and the density of multiple pores when the wood is cedar. [Modes for carrying out the invention]

[0009] An embodiment of the chemically treated wood and a method for manufacturing the chemically treated wood of the present invention will be described with reference to the drawings. The wood for chemical treatment in this embodiment is wood (raw wood) that is subjected to chemical treatment, and is used in the manufacture of chemically treated wood, in which it is impregnated with chemicals for chemical treatment of wood. Furthermore, the method for manufacturing chemically treated wood in this embodiment includes a method for manufacturing wood for chemical treatment, and in an intermediate stage of manufacturing chemically treated wood, the wood for chemical treatment is manufactured.

[0010] Figure 1 is a flowchart showing the manufacturing procedure for chemically treated wood according to this embodiment. As shown in the diagram, trees are felled to obtain the main felled timber (S101 in Figure 1). Then, the main felled timber is sawn using a sawmill to process the wood for chemical treatment into product shapes (S102 in Figure 1). The wood for chemical treatment is, for example, cypress or cedar, and is processed into the shapes of planks, square timbers, and pillars. Subsequently, the processed wood is incised using an incising device to produce wood for chemical treatment (S103 in Figure 1). Incising is a process that creates cuts (in this case, holes) in the wood, and can be done by various lasers or by drilling. Examples of lasers include ultraviolet lasers (UV lasers) and carbon dioxide lasers (CO2 lasers).

[0011] Figure 2 shows the insizing apparatus 10 of this embodiment, illustrating the schematic configuration of the insizing apparatus 10 and the wood 20 for chemical treatment. As shown in the figure, here, the incising process is a hole-making process using an ultraviolet laser, and the incising device 10 is an ultraviolet laser hole-making device that performs hole-making with an ultraviolet laser. The incising device 10 includes a holding table 11 that holds the wood 20 for chemical treatment, and an irradiation device 12 that irradiates the wood 20 for chemical treatment with laser light (laser beam) of an ultraviolet laser.

[0012] The wood 20 for chemical treatment is placed on the holding table 11 and disposed between the irradiation device 12 and the holding table 11. The irradiation device 12 is disposed facing the holding table 11 and the wood 20 for chemical treatment, and irradiates laser light toward the surface portion 21 of the wood 20. The surface portion 21 of the wood 20 is a portion of the surface (outer surface) of the wood 20 and receives the laser light. The incising device 10 performs hole-making on the wood 20 with the laser light irradiated from the irradiation device 12, and forms holes from the surface portion 21 of the wood 20 toward the inside of the wood 20.

[0013] By the hole-making process with the laser light, a blind hole or a through hole is formed in the wood 20. A blind hole is a hole that closes inside the wood 20 without penetrating the wood 20, and a through hole is a hole that penetrates the wood 20. The incising device 10 moves the holding table 11 or the irradiation device 12 by a moving device (not shown) to relatively move the wood 20 with respect to the irradiation device 12. The incising device 10 repeats the relative movement of the wood 20 with respect to the irradiation device 12 and the hole-making of the wood 20 with the laser light to form a plurality of holes in the wood 20. [[ID=⑨]]

[0014] FIG. 3 is a plan view showing the wood 20 for chemical treatment of the present embodiment, and shows the wood 20 as viewed from the direction of the arrow S in FIG. 2. As shown in the figure, wood 20 for chemical treatment is manufactured by insizing using an insizing device 10 to form multiple holes 22 in the wood 20. The wood 20 for chemical treatment has a surface portion 21 and multiple holes 22 opening into the surface portion 21. The surface portion 21 of the wood 20 is the part of the surface of the wood 20 that comes into contact with the chemicals used in the chemical treatment of the wood 20. The multiple holes 22 are insizing holes formed by the insizing process, and are formed in the surface portion 21 and the wood 20 at intervals from each other.

[0015] The wood 20 for chemical treatment has a decorative surface portion 23 and a non-decorative surface portion 24 (see Figure 2). In the state of use of the wood 20 (chemically treated wood) in a product manufactured using the wood 20, the decorative surface portion 23 is the part that is exposed and visible as the outer surface of the product, and the non-decorative surface portion 24 is the part that is not exposed and is not visible as the outer surface of the product. Here, the surface portion 21 of the wood 20 is the decorative surface portion 23, and the non-decorative surface portion 24 is the surface portion on the opposite side of the wood 20, located on the opposite side of the decorative surface portion 23 (surface portion 21). Multiple holes 22 are formed dispersed throughout the surface portion 21, and each hole opens on the surface portion 21 and is open to the outside of the wood 20.

[0016] On the surface portion 21 of the wood 20, the multiple holes 22 are formed with spacing between them in one of two directions (X direction, Y direction) and the other direction (Y direction) (see Figure 3A). Alternatively, the multiple holes 22 are formed with spacing between them in one direction (X direction), and the positions of adjacent holes 22 are offset in the other direction (Y direction) (see Figure 3B). Here, the X direction is the width direction of the wood 20, and the Y direction is the length direction of the wood 20.

[0017] The visible light reflectance maintenance rate (M) of the surface portion 21 of the wood 20 is the percentage of the visible light reflectance (F2) of the surface portion 21 after the formation of the multiple holes 22 (with multiple holes 22 formed) to the visible light reflectance (F1) of the surface portion 21 before the formation of the multiple holes 22 (without multiple holes 22 being formed) (M = (F2 / F1) × 100). In other words, the visible light reflectance maintenance rate (M) of the surface portion 21 is the ratio of the visible light reflectance (F2) of the surface portion 21 after the formation of the multiple holes 22 to the visible light reflectance (F1) of the surface portion 21 before the formation of the multiple holes 22, with the F1 being set to 100.

[0018] The visible light reflectance maintenance rate (M) of the surface portion 21 of the wood 20 is 90-100% (90% or more and 100% or less). Thus, the visible light reflectance (F2) of the surface portion 21 after the formation of the multiple holes 22 is 90-100% (0.9-1 times) of the visible light reflectance (F1) of the surface portion 21 before the formation of the multiple holes 22. After the formation of the multiple holes 22, the visible light reflectance maintenance rate (M) of the surface portion 21 of the wood 20 becomes a value within the range of 90-100%, and the visible light reflectance (F2) of the surface portion 21 becomes a value within the range of 90-100% of the visible light reflectance (F1) of the surface portion 21 before the formation of the multiple holes 22.

[0019] In visible light reflectance, visible light refers to light in the wavelength range of 400 to 800 nm, and the reflectance in visible light reflectance is the reflectance percentage specified in the Japanese Industrial Standard (JIS K 0115:2020) (hereinafter referred to as JIS K 0115). Visible light reflectance is measured by a measurement test in accordance with JIS K 0115. Visible light reflectance is measured by detecting the intensity of reflected light diffusely reflected from the surface 21 of the wood 20. Visible light reflectance is measured as the average value of the reflectance at each wavelength when the reflectance is measured over the entire wavelength range of visible light. Using a visible light reflectance measuring device in accordance with JIS K 0115, the visible light reflectance (F1, F2) of the same location on the surface 21 is measured before and after the formation of multiple holes 22, and the visible light reflectance maintenance rate (M) is calculated and measured from the measured visible light reflectance (F1, F2).

[0020] The average diameter of the multiple holes 22 is the average of the individual diameters of the multiple holes 22 on the surface 21 of the wood 20, and is a diameter of 10 to 300 μm (10 μm or more and 300 μm or less). The multiple holes 22 are formed with an average diameter within the range of 10 to 300 μm. The density of the multiple holes 22 is the number of holes 22 per square centimeter on the surface 21 of the wood 20, and is 0.0625 to 40 holes / cm 2 (0.0625 pieces / cm 2 More than 40 pieces / cm 2 The density is as follows: Multiple pores 22 range from 0.0625 to 40 pores / cm³. 2 It is formed at a density within the range.

[0021] When multiple holes 22 are formed from only the surface portion 21 of the wood 20 toward the interior of the wood 20, the holes 22 are formed either penetrating the wood 20 or not penetrating the wood 20 but extending from the surface portion 21 of the wood 20 to the vicinity of the opposite surface portion (non-design surface portion 24) located on the opposite side of the surface portion 21. In contrast, when multiple holes 22 are formed from one surface portion 21 (design surface portion 23) and the other surface portion (non-design surface portion 24) located on opposite sides of the wood 20 toward the interior of the wood 20, the holes 22 are formed from each of the surface portions 21 and the other of the wood 20 to a central position between the two surfaces. Therefore, the holes 22 are formed to a depth of half the size of the wood 20 in the depth direction of the holes 22. Here, the depth direction of the holes 22 is the thickness direction of the wood 20, and the size of the wood 20 is the thickness of the wood 20.

[0022] Wood 20 is wood used for chemical treatment, impregnated with chemicals used in the chemical treatment of wood. It is used in the manufacture of chemically treated wood with multiple pores 22 formed in it, and is impregnated with chemicals. Wood 20 is also an intermediate product in the manufacture of chemically treated wood, and wood before chemical treatment (before impregnation with chemicals). Chemical treatment of wood is a modification process that chemically modifies (improves) the raw material wood 20 (raw wood), and modifies the wood 20 using chemicals.

[0023] The chemical is a liquid or gaseous chemical (modifier) ​​that modifies the wood 20 and penetrates the wood 20. Chemically treated wood is wood that has been chemically treated (wood after chemical treatment), and is produced by applying a chemical treatment, including impregnation with the chemical, to the wood 20. Here, the chemical treatment of wood is a modification treatment (durability treatment) that modifies the durability of the wood, and chemically treated wood is wood with modified durability. The durability of wood includes, for example, resistance to decay, weather resistance, termite resistance, and strength.

[0024] Chemical treatments of wood include, for example, acetylation, furfuryl alcohol treatment, low molecular weight phenol treatment, and acrylic treatment. The chemicals used in these wood treatments include, for example, acetic anhydride, furfuryl alcohol, low molecular weight phenolic resin, and acrylic resin. Thus, chemically treated wood includes, for example, acetylated wood, furfuryl alcohol treated wood, low molecular weight phenol treated wood, and acrylic treated wood.

[0025] For example, in acetylation treatment, acetic anhydride is impregnated into the wood 20 to induce an acetylation reaction within the wood 20, thereby acetylating the wood 20. This imparts water repellency to the chemically treated wood, suppresses water absorption, and ensures the durability of the chemically treated wood. In furfuryl alcohol treatment, furfuryl alcohol is impregnated into the wood 20, causing the furfuryl alcohol to convert into furan resin within the wood 20. This furan resin fills the gaps in the vessels of the chemically treated wood, suppresses water absorption, and ensures the durability of the chemically treated wood.

[0026] After the production of the wood 20 for chemical treatment, the wood 20 is heated to a drying temperature using a drying device to dry it (S104 in Figure 1). Subsequently, the wood 20 is impregnated with a chemical agent using an impregnation device (S105 in Figure 1), and the wood 20 is subjected to chemical treatment to produce chemically treated wood. When chemically treating the wood 20, the entire wood 20 is immersed in the chemical agent to allow the agent to penetrate the wood 20. The multiple pores 22 are penetration holes that promote the penetration of the chemical agent into the wood 20, and are formed by opening into the surface portion 21 of the wood 20. The surface portion 21 of the wood 20 and the multiple pores 22 are exposed to and in contact with the chemical agent. The chemical agent penetrates from the surface portion 21 and the multiple pores 22 of the wood 20 towards the interior of the wood 20, impregnating the wood 20. Here, the chemical agent is impregnated into the wood 20 by an impregnation treatment under pressure or atmospheric pressure.

[0027] Figure 4 shows the drug impregnation device 30 of this embodiment, illustrating the schematic configuration of the impregnation device 30. As shown in the figure, the impregnation device 30 comprises a chamber 31 for containing wood 20 and a tank 32 for storing chemicals. The containment chamber 33 of the chamber 31 is the internal space of the chamber 31 for containing wood 20. The tank 32 is connected to the chamber 31 via a connecting pipe 34 and supplies the chemicals to the containment chamber 33 of the chamber 31.

[0028] When impregnating the wood 20 with the chemical, the dried wood 20 is placed in the containment chamber 33 of the chamber 31. Next, the chemical is supplied from the tank 32 to the containment chamber 33 of the chamber 31, and the chemical is introduced into the containment chamber 33 of the tank 32 (S105-1 in Figure 1). Subsequently, the chemical is injected into the wood 20 under pressurized or atmospheric pressure (S105-2 in Figure 1). This allows the chemical to penetrate the wood 20, impregnating the entire piece of wood 20.

[0029] After removing the wood 20 impregnated with the chemical from the containment chamber 33 of the chamber 31, the wood 20 is heated to a drying temperature using a drying device to dry it (S106 in Figure 1). Subsequently, the wood 20 is heated to a heat treatment temperature using a heating device to heat treat the wood 20 (S107 in Figure 1). Note that the drying of the wood 20 impregnated with the chemical and the heat treatment of the wood 20 may be carried out simultaneously. The heat treatment promotes, for example, the reaction between the chemical and the wood 20 within the wood 20, or hardens the chemical impregnated into the wood 20. This produces chemically treated wood from the wood 20 (S108 in Figure 1). The chemically treated wood produced can be used, for example, for curtain walls, building windows, building fixtures, residential windows, residential fixtures, and exterior equipment (decks, gates, fences, etc.).

[0030] In the chemically treated wood 20 described above, the chemicals penetrate the wood 20 more easily through the multiple pores 22. Furthermore, on the surface 21 of the wood 20, the higher the visible light reflectance retention rate (M), the smaller the change in how visible light is reflected before and after the formation of the multiple pores 22. The visible light reflectance retention rate (M) changes depending on the state of the multiple pores 22 formed on the surface 21, and increases as the multiple pores 22 become less noticeable. Therefore, the higher the visible light reflectance retention rate (M), the higher the aesthetic appeal of the surface 21 of the wood 20, and the higher the aesthetic appeal of the surface 21 of the chemically treated wood after manufacturing, resulting in a better appearance of the surface 21 of the chemically treated wood. In contrast, if the visible light reflectance maintenance rate (M) is less than 90%, that is, if the visible light reflectance (F2) of the surface portion 21 is less than 90% of the visible light reflectance (F1) of the surface portion 21 before the formation of the multiple holes 22, the change in how visible light is reflected before and after the formation of the multiple holes 22 will be large, which may affect the aesthetic appearance of the surface portion 21.

[0031] When the visible light reflectance maintenance rate (M) of the surface portion 21 of the wood 20 is 90-100%, that is, when the visible light reflectance (F2) of the surface portion 21 is 90-100% of the visible light reflectance (F1) of the surface portion 21 before the formation of the multiple holes 22, it is possible to suppress the change in the way visible light is reflected before and after the formation of the multiple holes 22 and ensure the aesthetic appeal of the surface portion 21. In addition, the multiple holes 22 of the surface portion 21 become less noticeable. Therefore, it is possible to suppress changes in the appearance of the surface portion 21 and ensure the aesthetic appeal of the surface portion 21. 100% in the visible light reflectance maintenance rate (M) of the surface portion 21 is the upper limit of the achievable visible light reflectance maintenance rate (M). If there is no change in the visible light reflectance before and after the formation of the multiple holes 22, the visible light reflectance maintenance rate (M) of the surface portion 21 will be 100%, and the visible light reflectance (F2) of the surface portion 21 will be 100% of the visible light reflectance (F1) of the surface portion 21 before the formation of the multiple holes 22.

[0032] Thus, in this embodiment, the chemically treated wood 20 and the method for manufacturing the chemically treated wood make it easier to impregnate the wood 20 with the chemicals used in the chemical treatment of the wood while ensuring the aesthetic appeal of the surface portion 21 of the wood 20. It is more preferable that the visible light reflectance maintenance rate (M) of the surface portion 21 is 97-100% (97% or more and 100% or less), that is, that the visible light reflectance (F2) of the surface portion 21 is 97-100% of the visible light reflectance (F1) of the surface portion 21 before the formation of the multiple holes 22. In this case, the aesthetic appeal of the surface portion 21 of the wood 20 can be more reliably ensured.

[0033] When the average diameter of the plurality of holes 22 is less than 10 μm, it becomes difficult to form the holes 22 in the wood 20, and there is a risk of affecting the time required for impregnating the wood 20 with the chemical agent. Also, when the average diameter of the plurality of holes 22 is greater than 300 μm, the holes 22 in the surface portion 21 of the wood 20 tend to be prominent, and there is a risk of affecting the design property of the surface portion 21. On the other hand, when the average diameter of the plurality of holes 22 is 10 to 300 μm, the holes 22 can be easily formed in the wood 20, the chemical agent can be smoothly impregnated into the wood 20 through the holes 22, and the holes 22 in the surface portion 21 of the wood 20 can be made less prominent. The average diameter of the plurality of holes 22 is more preferably 100 to 300 μm (100 μm or more and 300 μm or less). In this case, the holes 22 can be easily formed in the wood 20, and the time required for impregnating the wood 20 with the chemical agent can also be shortened.

[0034] When the density of the plurality of holes 22 is less than 0.0625 holes / cm 2 there is a risk that the chemical agent will be difficult to impregnate into the wood 20. Also, when the density of the plurality of holes 22 is greater than 40 holes / cm 2 the holes 22 in the surface portion 21 of the wood 20 tend to be prominent, and there is a risk of affecting the design property of the surface portion 21. On the other hand, when the density of the plurality of holes 22 is 0.0625 to 40 holes / cm 2 it is possible to facilitate the impregnation of the chemical agent into the wood 20 while suppressing the prominence of the holes 22 in the surface portion 21 of the wood 20. The density of the plurality of holes 22 is more preferably 0.25 to 20 holes / cm 2 In this case, the holes 22 can be easily formed in the wood 20, and the holes 22 in the surface portion 21 of the wood 20 can be made less prominent.

[0035] The surface portion 21 of the wood 20 for chemical treatment may be one of several surface portions of the wood 20, two or more surface portions of the wood 20, or all surface portions. For example, the surface portion 21 of the wood 20 may be both the decorative surface portion 23 and the non-decorative surface portion 24 of the wood 20. In this case, the average diameter of the multiple holes 22 in the non-decorative surface portion 24 is made larger than the average diameter of the multiple holes 22 in the decorative surface portion 23, and the density of the multiple holes 22 in the non-decorative surface portion 24 is made larger than the density of the multiple holes 22 in the decorative surface portion 23. This makes it possible to shorten the time required for the chemical to be impregnated into the wood 20 while ensuring the aesthetic appeal of the decorative surface portion 23 of the wood 20.

[0036] (Examples) Chemical treatment wood 20 was produced using the method for manufacturing chemical treatment wood of this embodiment. The wood 20 was made of cypress and cedar, and multiple holes 22 were formed in the wood 20 using an insizing device 10, which is an ultraviolet laser hole processing device. The dimensions of the wood 20 were 30 mm in thickness, 30 mm in width, and 60 mm in length. Multiple pieces of wood 20 were produced using both cypress and cedar, with varying hole depths and densities. The average diameter of the holes 22 and the visible light reflectance maintenance rate (M) of the surface portion 21 were also measured for each piece of wood 20. Table 1 shows the average diameter of the multiple holes 22 when the wood 20 is cypress, and Table 2 shows the average diameter of the multiple holes 22 when the wood 20 is cedar.

[0037] [Table 1]

[0038] [Table 2]

[0039] As shown in Tables 1 and 2, the depths of the multiple holes 22 formed in the wood 20 are 5 mm and 15 mm, and the density of the multiple holes 22 is 40, 20, 4, and 2 holes / cm³ at each of the two depths. 2These are the four densities. The average diameter of the holes 22 was measured for each of the woods 20 (cypress and cedar) with different hole depths and densities. As a result, the average diameter of the holes 22 was in the range of 112.2 to 287.4 μm.

[0040] In measuring the visible light reflectance maintenance rate (M) of the surface portion 21 of the wood 20, the visible light reflectance (F1, F2) of the surface portion 21 before and after the formation of multiple holes 22 was measured using a visible light reflectance measuring device compliant with JIS K 0115. The measuring device used was a spectrophotometer "UV-3600" and a large sample chamber "MPC-3100" manufactured by Shimadzu Corporation (incident angle: 8°, φ60 mm integrating sphere, detector: PbS (photoconductive element) and photomultiplier tube). The visible light reflectance (F1, F2) was measured by taking the reflectance every 5 nm within the wavelength range of 400 to 800 nm and measuring the average value of the reflectance at each wavelength. The visible light reflectance maintenance rate (M) of the surface portion 21 was calculated and measured based on the measurement results of the visible light reflectance (F1, F2).

[0041] Table 3 shows the visible light reflectance maintenance rate (M) of the surface portion 21 when the wood 20 is cypress, and Table 4 shows the visible light reflectance maintenance rate (M) of the surface portion 21 when the wood 20 is cedar. Figure 5 is a graph showing the relationship between the visible light reflectance maintenance rate (M) of the surface portion 21 and the density of multiple pores 22 when the wood 20 is cypress, and Figure 6 is a graph showing the relationship between the visible light reflectance maintenance rate (M) of the surface portion 21 and the density of multiple pores 22 when the wood 20 is cedar.

[0042] [Table 3]

[0043] [Table 4]

[0044] As shown in Tables 3 and 4, the depths of the multiple holes 22 formed in the wood 20 are 5, 10, and 15 mm. The density of the multiple holes 22 is 40, 20, 4, and 2 holes / cm³ at depths of 5 and 15 mm, respectively. 2 These are the four densities, and at a depth of 10 mm, they are 40 and 2 particles / cm³. 2 These are the two densities. The visible light reflectance maintenance rate (M) of the surface portion 21 of the wood 20 was measured for each of the wood 20 (cypress and cedar) with different pore depths and densities. In Figures 5 and 6, the relationship between the visible light reflectance maintenance rate (M) of the surface portion 21 and the density of multiple pores 22 is shown in line graphs for each of the three pore depths 22.

[0045] Figures 5A1 and 6A2 are line graphs when the depth of the holes 22 is 5 mm, Figures 5B1 and 6B2 are line graphs when the depth of the holes 22 is 10 mm, and Figures 5C1 and 6C2 are line graphs when the depth of the holes 22 is 15 mm. The visible light reflectance maintenance rate (M) of the surface portion 21 of the wood 20 was in the range of 91.9 to 100.0%. From this, the visible light reflectance (F2) of the surface portion 21 is 91.9 to 100.0% of the visible light reflectance (F1) of the surface portion 21 before the formation of the multiple holes 22. In all of the multiple pieces of wood 20, the aesthetic appearance of the surface portion 21 of the wood 20 was ensured, and the multiple holes 22 made it easier for the chemical to be impregnated into the wood 20.

[0046] As described above, this embodiment discloses the wood for chemical treatment described in (1) to (3) below, and a method for producing the chemically treated wood described in (4).

[0047] (1) Wood for chemical treatment having a surface portion that comes into contact with chemicals used in the chemical treatment of wood, and a plurality of pores opening in the surface portion, Wood for chemical treatment, wherein the visible light reflectance of the surface portion is 90 to 100% of the visible light reflectance of the surface portion before the formation of the plurality of pores. (1) The wood for chemical treatment described above makes it easier to impregnate the wood with the chemicals used in the chemical treatment of the wood while ensuring the aesthetic appeal of the surface of the wood.

[0048] (2) In the wood for chemical treatment described in (1), Wood for chemical treatment, wherein the average diameter of the aforementioned multiple pores is 10 to 300 μm. In the wood for chemical treatment described in (2), pores can be easily formed in the wood, chemicals can be smoothly impregnated into the wood through the pores, and the pores on the surface of the wood can be made less noticeable.

[0049] (3) In the wood for chemical treatment described in (1) or (2), The density of the aforementioned multiple pores is 0.0625 to 40 pores / cm³. 2 This is wood intended for chemical treatment. (3) With the chemically treated wood described above, it is possible to make it easier for the chemical to penetrate the wood while suppressing the visibility of pores on the surface of the wood.

[0050] (4) A process for producing wood for chemical treatment as described in any of (1) to (3), A step of impregnating the wood for chemical treatment with the aforementioned chemical agent and subjecting the wood for chemical treatment to chemical treatment in order to produce chemically treated wood, A method for producing chemically treated wood having the properties of The method for manufacturing chemically treated wood described in (4) makes it possible to easily impregnate the wood with the chemicals used in the chemical treatment of the wood while ensuring the aesthetic appeal of the surface of the wood. [Explanation of Symbols]

[0051] 10...Insizing device, 11...Holding stand, 12...Irradiation device, 20...Wood for chemical treatment, 21...Surface part, 22...Hole, 23...Designed surface part, 24...Non-designed surface part, 30...Impregnation device, 31...Chamber, 32...Tank, 33...Containment chamber, 34...Connecting pipe.

Claims

1. A piece of wood for chemical treatment having a surface that comes into contact with chemicals used in the chemical treatment of wood, and a plurality of pores opening in the surface, Wood for chemical treatment, wherein the visible light reflectance of the surface portion is 90 to 100% of the visible light reflectance of the surface portion before the formation of the plurality of holes.

2. In the wood for chemical treatment described in claim 1, Wood for chemical treatment, wherein the average diameter of the plurality of pores is 10 to 300 μm.

3. In the wood for chemical treatment described in claim 1 or 2, The density of the aforementioned multiple pores is 0.0625 to 40 pores / cm³. ２ This is wood intended for chemical treatment.

4. A process for producing wood for chemical treatment as described in claim 1 or 2, A step of impregnating the wood for chemical treatment with the aforementioned chemical agent and subjecting the wood for chemical treatment to chemical treatment in order to produce chemically treated wood, A method for producing chemically treated wood having the properties of

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