JP4199824B1 - Method for producing modified wood - Google Patents

Abstract

[PROBLEMS] To provide a method for producing a modified wood in which a wood preservative is injected with high dimensional accuracy without using a wood larger than a target size as a raw material wood, and a modified wood produced by the method. It aims at providing the building material which consists of quality wood and the said modified wood.
A chemical injection step of expanding a wood by injecting a wood preservative solution containing a dimensional stabilizer into wood having a moisture content of 20% or less and a predetermined cross-sectional dimension. A modified wood comprising: a drying step of drying a solvent in the wood preservative solution injected into the wood; and a dimension adjusting step of processing the dried wood into the predetermined cross-sectional dimensions. The manufacturing method is used.
[Selection] Figure 1

Description

The present invention relates to a process for producing a modified timber, the detail is al, for example, relates to a method of using a timber of standardized dimensions, to produce a modified wood excellent standardized dimensions and dimensional stability .

  The moisture content of raw materials is very high. For this reason, the raw material shrinks while releasing moisture until the moisture content reaches the equilibrium moisture content, so that the dimensional change becomes large.

  In order to suppress such dimensional changes due to the release of moisture, in the production of wood with standardized dimensions, which is used as a general building material, etc., the moisture in the raw material is preliminarily near the equilibrium moisture content. After being stabilized, the dimensions are stabilized and then processed into standardized dimensions. For example, in the case of cedar raw materials, the moisture content immediately after logging is about 160%, but after drying in advance, it is dried to an equilibrium moisture content of 15 to 20%, and then processed into standardized dimensions. Is done. In this case, for example, in order to produce a 105 mm square product, the moisture content of the raw material of about 110 to 120 mm square is dried to about 15 to 20%, and then the 105 mm square product is cut out, A method of reducing the dimensional change of the final product has been performed.

  In the drying as described above, when drying rapidly, the timber after drying tends to crack or warp due to a sudden dimensional change. As a method for suppressing the occurrence of such cracks and warpage, a method of gradually drying while humidifying until a predetermined moisture content is achieved is known. According to such a method, since the rapid dimensional change during drying is suppressed, generation | occurrence | production of a crack and curvature can be suppressed. However, according to such a method of drying over a long period of time while adjusting the humidity, there are problems such as requiring a large-scale apparatus for conditioning the humidity and requiring a long processing time. In order to solve such a problem, for example, in Patent Document 1 below, the raw material is pre-dried so that the moisture content of the surface layer portion is 25 to 60%, the step of processing into a predetermined shape, the surface layer portion Describes a method for dimensional stabilization treatment of wood, in which a step of injecting a dimensional stabilizing agent and then a step of heating and drying while degassing without substantially humidifying from the outside are described. According to this method, by injecting a dimensional stabilizer into wood, dimensional stability can be maintained while suppressing cracks and the like due to dimensional changes that occur when the raw material is dried.

By the way, the wood used for building materials and furniture materials obtained as described above is generally ant or antiseptic in order to suppress the damage caused by white ants or to suppress the decay by decaying fungi. Chemical treatment such as wood preservatives such as treatment is performed. As such a chemical treatment method, a method of applying a wood preservative to the surface of a wooden building at a construction site, a method of pre-pressing a wood preservative into wood at a factory, and the like are known.
JP 2002-234004 A

  According to the method of applying a wood preservative to the surface of a wooden building at the construction site, the wood preservative did not sufficiently penetrate into the wood, and the sustainability of the effect of the wood preservative was not sufficient. On the other hand, according to the method of pressure-injecting wood into the factory, problems as described below have occurred.

  For example, when manufacturing a standardized 105 mm square modified wood, a general wood preservative solution is applied to a square wood having a side length A of 105 mm as shown in FIG. When injected, as shown in FIG. 2 (b), the square bar expands, resulting in a square bar having a side length B of approximately 107 to 110 mm. Then, when the expanded square is dried by a drying process, as shown in FIG. 2 (c), the square is contracted, and a square having a side C of about 105 mm in one side is obtained. By such a method, a modified wood having a size close to the standardized size can be obtained.

  However, according to such a method, since a square material having a size close to a standardized 105 mm square is obtained, as shown in FIG. 2 (c), deformation such as cracking and warping occurred in the surface layer portion. In some cases, when such a portion is prepared by cutting or the like, a modified timber having a standardized dimension of 105 mm square cannot be obtained. Therefore, in order to obtain the modified wood with the desired standardized dimensions, the desired standardized dimensions are taken into account by taking into account the cutting margin for adjusting cracks and warpage of the surface layer portion by cutting. On the other hand, we had to use a large piece of wood with a certain width of cutting margin. In such a case, the amount of wood to be cut is wasted.

The present invention purposes as wood raw material, without using a larger timber than the dimension of interest, to provide a manufacturing how the reformed timber capable of producing modified wood wood preservative was injected with high dimensional accuracy And

  The method for producing a modified wood according to the present invention includes the step of injecting a wood preservative solution containing a dimensional stabilizer into wood having a moisture content of 20% or less and having a predetermined cross-sectional dimension. A step of injecting the medicine into the wood, a drying step of drying the solvent in the wood preservative solution injected into the wood, and a size adjusting step of processing the dried wood into the predetermined cross-sectional dimensions. It is characterized by.

  According to such a configuration, since the wood preservative solution is injected into the wood having a moisture content of 20% or less, a large amount of the wood preservative solution can be injected into the wood. Since the wood preservative solution injected into the wood contains a dimensional stabilizer, even if the solvent of the wood preservative solution injected into the wood is dried, the wood is almost shrunk unlike the conventional case. Instead, the wood remains expanded. Therefore, deformation of the wood due to dimensional changes during drying can be suppressed. And the wood obtained by drying can be adjusted to a predetermined cross-sectional dimension before injecting the wood preservative solution. By adjusting the dimensions in this way, a modified wood having the same cross-sectional dimensions as before injection of the wood preservative solution can be obtained with high dimensional accuracy.

  Therefore, the modified wood into which the wood preservative is injected can be produced with high dimensional accuracy without using wood larger than the target size as raw material wood. Specifically, for example, standardized modified wood can be obtained using standardized raw material wood, so there is no need to prepare nonstandard wood and low cost modified wood. Is obtained. In addition, the dimensional stability required when using wood as building materials, furniture, etc. is superior to conventional dry wood because a wood preservative solution containing a dimensional stabilizer is injected into the wood during the injection process. It will be a thing.

  In the manufacturing method, when the wood having the predetermined cross-sectional dimension is pre-sized so that the raw material wood is difficult to be injected with a wood preservative solution, a so-called difficult-to-inject material, the wood preservative It is preferable in that the solution can be injected efficiently to the deep part of the wood. Furthermore, when the wood is dried, moisture release to the outside of the wood can be significantly promoted, and the time required for drying to a predetermined moisture content can be shortened.

  In the manufacturing method, the chemical injection step is a step of pressurizing and injecting the wood preservative solution into the wood having the predetermined cross-sectional dimension. It is preferable in that it can be performed.

  It is preferable that the wood preservative solution further contains at least one of a preservative and an antifungal agent because the antiseptic properties and the antifungal properties particularly required as wood preservability can be improved.

  According to the present invention, modified wood into which a wood preservative has been injected can be produced with high dimensional accuracy without using wood larger than the target size as raw material wood. For example, it is possible to manufacture a modified wood having a standardized dimension with high dimensional accuracy by using raw material wood having a standardized dimension.

  Hereinafter, the present invention will be described in detail.

  The method for producing a modified wood according to the present invention includes the step of injecting a wood preservative solution containing a dimensional stabilizer into wood having a moisture content of 20% or less and having a predetermined cross-sectional dimension. A step of injecting the medicine into the wood, a drying step of drying the solvent in the wood preservative solution injected into the wood, and a size adjusting step of processing the dried wood into the predetermined cross-sectional dimensions. It is characterized by. According to the present invention, for example, modified wood that has been modified to improve wood preservation such as antiseptic and ant-proofing properties is not a raw material wood having a size larger than the standard, but a raw material wood having a standardized size. By using this, modified wood according to standard dimensions can be manufactured with high dimensional accuracy. And the dimensional stability calculated | required when using wood as a building material, a furniture material, etc. becomes a thing superior to the conventional dry wood.

  Specifically, the manufacturing method is, for example, a method as shown in FIG. For example, when manufacturing a 105 mm square modified wood, as shown in FIG. 1 (a), first, a square material having a side length A of 105 mm is prepared. Then, as shown in FIG. 1 (b), the square material is expanded by the chemical injection step of injecting the wood preservative solution containing the dimension stabilizer into the square material, and the length B of one side of the square material cross section is , Which is about 107 to 110 mm. And even if the expanded square is dried by a drying process, as shown in FIG. 1 (c), the square is hardly contracted, and the length C of one side of the square is still expanded to about 107 to 110 mm. The dried squarewood. Then, by adjusting the size of the dried square bar to a desired size of 105 mm square in the dimension adjustment step, a modified wood having a desired dimension can be obtained.

  The raw material wood used in the present invention is not particularly limited and may be a solid material or a laminated material. However, as the raw material wood, wood having a moisture content of 20% or less and having a predetermined cross-sectional dimension is used. Specifically, for example, a sufficiently dried building material having a standard size (for example, Japanese agricultural and forestry of lumber) D25, D20, D18, D15 specified in the standard, D15 specified in the Japanese Agricultural Standard for Glued Wood) and processed wood products. The cross-sectional dimension is the length of one side of a square bar cross section in the case of a square bar, and the diameter of the cross section of the column bar in the case of a column bar, for example, a dimension standardized by JIS or JAS. The moisture content is a moisture content measured using a Wakaru-type moisture content measuring device (handy type). In the case of a large diameter material at a depth position from the surface layer, it is 8 mm or more, preferably 10 mm or more. The moisture content is preferably 15 mm or more, and in the case of a plate material, the moisture content is 10% or more of the total thickness, more preferably 15% or more. By using wood dried so that the moisture content is 20% or less, a large amount of wood preservative solution can be injected in the chemical injection step. That is, according to the production method of the present invention, modified wood can be produced using, for example, wood having an equilibrium water content as raw material wood. The equilibrium moisture content is the moisture content at the time when the atmospheric water vapor pressure and the water vapor pressure based on moisture in the wood are equal to each other until the water vapor pressure reaches the equilibrium state according to the temperature and humidity of the atmosphere. is there. The equilibrium moisture content is almost the same for all tree species and is about 15%, although it varies somewhat depending on the usage environment and purpose.

  In addition, the tree species of the raw material wood is not particularly limited. Examples include conifers, chestnuts, zelkova, beech, maple, kungi and other broad-leaved trees. Among these, cedar, cypress, and red pine are preferred.

  In addition, if the raw material wood is pre-sized on the surface in advance, it is difficult to inject the wood preservative solution into the wood preserving agent. It is preferable at the point which can be performed efficiently. Furthermore, when the wood is dried, moisture release to the outside of the wood can be significantly promoted, and the time required for drying to a predetermined moisture content can be shortened.

  The pitch and depth of the insizing are not particularly limited, and may be appropriately determined each time in consideration of difficulty in injecting the wood preservative solution that varies depending on the tree species and the like.

  If the wood to be treated is a relatively thin plate or sapwood, drying and injection of the wood preservative solution can be performed efficiently without performing insizing treatment, but particularly in the portion where the core material portion is exposed, It is desirable to apply an insizing process to promote drying and injection.

  Moreover, the raw material wood may be processed into a predetermined shape in advance. This processing includes, for example, cutting to adjust the size and shape, joint processing and joint processing such as ants and hooks using fleas and precut machines, groove / decorative engraving, dowel processing, pilot holes for metal fittings Examples of processing include processing.

  The chemical injection step employed in the present invention is not particularly limited as long as it is an injection treatment employed when injecting a preservative or the like into wood. Specifically, for example, immersion treatment, hot / cold bath, etc. Treatment, decompression injection treatment, pressure injection treatment, and the like. Further, the wood after the chemical injection step has a moisture content increased to 100% or more and becomes an expanded wood. In addition, the wood preservative solution is quickly injected into the void portion where the moisture has been removed from the dried wood by the chemical injection step. In addition, the timber into which the wood preservative solution containing the dimensional stabilizer is injected has a dimensional stabilizer intruded into the voids, and therefore causes a dimensional change such as shrinkage when drying without adjusting the humidification. Therefore, quick drying is possible in a short time.

  It is preferable that the chemical injection step is performed by pressure injection among the above injection processes because the injection of the wood preservative solution can be performed efficiently in a short time. In the pressure injection treatment, the pressure condition is not particularly limited, but the pressure is preferably 0.1 MPa or more, and more preferably 1.4 MPa or more.

Further, the amount of the wood preservative solution to be injected is preferably 100 kg / m ³ or more, and more preferably 150 kg / m ³ or more. In addition, in order to enhance the dimensional stability of the wood after the drying process and when it is put into practical use as a final product, the amount of the dimensional stabilizer contained in the wood preservative solution is 7 kg / m ³ or more. Preferably, it is 10 kg / m ³ or more.

  The wood preservative solution is not particularly limited as long as it contains a dimensional stabilizer and can impart wood preservability such as antiseptic and ant repellency. For example, it is preferable that an antiseptic or an ant-preventing agent is contained together with the dimensional stabilizer in terms of enhancing the antiseptic and ant-preventing properties that are particularly required for wood preservation.

  There is no restriction | limiting in particular as a dimension stabilizer used here, A well-known dimension stabilizer can be used. Specifically, for example, alkylene glycols such as ethylene glycol, propylene glycol, and butylene glycol; polyalkylene glycols such as polyethylene glycol, polypropylene glycol, and polybutylene glycol; glycerin; 1,3-butanediol, polyoxyethylene tri Polyoxyethylene alkyl ethers such as decyl ether and polyoxyethylene nonylphenyl ether; polyvinyl alcohol; polyvinyl pyrrolidone; vinyl acetate; saccharides such as polyoxyethylene sorbitan monostearate, sorbitan monooleate and D-glucose; urea, methylol urea And urea compounds such as: phenol resins; inorganic salts such as calcium chloride, magnesium chloride, and barium chloride. These can be used alone or in appropriate combination of two or more. Of these, glycol compounds and urea are preferred because they do not adversely affect the human body when used as building materials, furniture materials, or the like, and have little adverse effect on the quality of processed wood products.

  There is no restriction | limiting in particular as a preservative, A well-known preservative can be used. Specifically, for example, higher organic quaternary ammonium compounds; aromatic benzimidazole derivatives such as 2- (4-thiazolyl) -1H-benzimidazole; aromas such as 2- (4-thiocyanomethylthio) -benzothiazole Aromatic quinoline derivatives such as 8-oxyquinoline copper; 1- [2- (2 ′, 4′-dichlorophenyl) -4-propyl-1,3-dioxolan-2-yl-methyl] -1H -1,2,4-triazole, 1- [2- (2 ′, 4′-dichlorophenyl 1,3-dioxolan-2-yl) methyl] -1H-1,2,4-triazole, α- (2, 4-chlorophenylethyl) -α- (1,1-dimethylethyl) -1H-1,2,4-triazole-1-ethanol, α- (4-chlorophenyl) -d- (1 Aromatic triazole derivatives such as cyclopropyl ethyl)-1H-1,2,4-triazole-1-ethanol; copper compounds such as cupric oxide, and the like. These can be used alone or in appropriate combination of two or more. Moreover, it is not limited to these.

There is no restriction | limiting in particular as an antifungal agent, A well-known antifungal agent can be used. Specifically, for example,
Carbamate compounds such as fenobucarb and carbaryl; pyrethroid compounds such as tralomethrin, permethrin and bifenthrin; etofenprox; silafluophene; imidacloprid; acetamiprid; boric acid; These can be used alone or in appropriate combination of two or more. Moreover, it is not limited to these.

  The said drying process employ | adopted by this invention is not restrict | limited especially, What is necessary is just a drying process employ | adopted for the drying process of wood, and either natural drying or artificial drying may be sufficient. In addition, in the past, the drying process of the wood was performed while appropriately humidifying from the outside in order to suppress deformation, but in the present invention, it is dried without being humidified from the outside substantially. be able to. Specifically, for example, heat drying may be performed while venting without substantially humidifying from the outside. That is, in the present invention, since the dimensional stabilizer is infiltrated into the void portion of the wood, the volatilization removal of the solvent and the like in the wood preservative can be proceeded with almost no shrinkage during the drying process. . Even in such a drying process in which no humidification is performed, the drying can proceed without contraction, and the time required for drying can be greatly shortened.

  The drying temperature varies depending on the type of tree, so it cannot be determined uniformly. However, in order to proceed with drying in a shorter time without causing changes in the material of the wood or the associated discoloration, it is 95 ° C or lower. Preferably, it is 85 ° C. or lower, 50 ° C. or higher, more preferably 60 ° C. or higher.

  Further, the wood after the drying step is preferably dried to a moisture content of 20% or less, more preferably 15% or less, which is a general equilibrium moisture content. Further, even when this wood is dried, it does not shrink as described above and remains expanded, so that deformation due to shrinkage hardly occurs.

  The said dimension adjustment process employ | adopted by this invention is not restrict | limited in particular, If it is employ | adopted for general wood processing, it can be used. Specifically, for example, cutting processing such as molder processing and the like can be mentioned. By such a dimensional adjustment step, the wood after the drying step can be adjusted to the size before injecting the wood preservative solution, and the modified wood of the same size as before injecting the wood preservative solution has a high size. Obtained with accuracy. Specifically, for example, a modified wood having a standard size can be obtained using a raw material wood having a standard size, so that the modified wood can be obtained at a low cost.

  Further, the modified wood produced by the above production method can be used as a building material. In a building, especially when it is sealed, the humidity changes greatly due to heating or the like. When the humidity changes, the moisture content of the wood used as a building material constructed on the inner surface of the building changes. Therefore, when conventional dry wood is used as a building material, the dimensional stability is low, so that there is a problem that the dimensions change. Since the building material made of the modified wood of the present invention is a building material excellent in dimensional stability, the dimensional change due to the change in humidity hardly occurs.

  In addition, the construction material made of solid material has a problem that the dimensional stability is low. For example, when a wooden building material is conventionally used as a flooring material, the size of each flooring material changes, and warping and gaps are caused. In order to prevent the occurrence of rusting, laminated timber is used in which timbers of various tree species are combined to suppress the occurrence of dimensional changes, and solid wood that easily changes in dimensions is rarely used. The building material of the present invention can be suitably used as a flooring material because a building material with high dimensional stability can be obtained even when a solid wood is used as the raw material wood.

  The invention will be described more specifically with reference to the following examples. The scope of the present invention is not limited by the examples.

[Experimental Example 1]
First, a wood preservation solution was pressure-injected into the raw wood.

  As the raw material wood, Batesga laminated timber having dimensions of 105 mm × 105 mm × 4000 mm was prepared. As the wood preservative solution, a mixture of an antiseptic / anticidal agent and a dimensional stabilizer was used. Specifically, the following wood preservative solution was used. As an antiseptic / anticidal agent, 2.0% (W / W) of “Rezac DPS” (quasi-preserving quaternary ammonium non-ester pyrethroid compound wood preservative: JIS K 1570 standard product) An aqueous solution was used. As the dimension stabilizer, 1,3-butylglycol (hereinafter referred to as BG) 4.7% (W / W) aqueous solution and urea 5.3% (W / W) aqueous solution were used. Then, a mixed solution in which Rezac DPS, BG and urea were mixed at a mass ratio of 2: 4.7: 5.3 was used as a wood preservative solution.

  The pressure injection is performed according to JIS A 9002, and the schedule at that time is 60 minutes for pre-exhaust (0.08 MPa or more), 240 minutes for pressure (1.4 MPa), 60 minutes for post-exhaust (0.08 MPa or more). ).

  Next, the wood into which the wood preservation solution was injected under pressure was dried. The drying was carried out in a room for one month, followed by drying at a dry bulb temperature of 60 ° C. and a wet bulb temperature of 40 ° C. until a predetermined water content was reached.

  Then, the dried wood was molded into a predetermined size by using Profit 23 manufactured by Weinig.

  According to the above process, warping or the like did not occur in the dried wood, and modified wood having a predetermined size was obtained by molder processing.

  When the modified wood was produced, the moisture content, dimensions, and warpage of the raw wood, the wood after injection of the wood preservative solution, the wood after natural drying, and the wood after artificial drying were measured. Moreover, the average value at the time of manufacturing 10 pieces or 15 pieces was made into each measurement result.

  In addition, the moisture content was measured using a Wakar type moisture content measuring device (handy type). For the dimensions, four dimensions of two sides (vertical dimension and horizontal dimension) of 500 mm from the mouth and two sides of 2000 mm (vertical dimension and lateral dimension) from the mouth were measured, and the average value was taken as the dimension. Further, the warp was measured by measuring the distance between a line connecting a corner having one end and the end of the other end corresponding to the corner and the wood, and setting the maximum value as the warp.

  As a result, the moisture content of the raw material wood is 15%, the moisture content of the wood after pouring is 132%, the moisture content of the wood after natural drying is 40%, and the moisture content of the wood after artificial drying is The water content was 15%.

  The size of the raw material wood is 105.1 mm, the size of the wood after pouring is 109.7 mm, the size of the wood after natural drying is 109.4 mm, and the size of the wood after artificial drying Was 109.7 mm.

  The warp of the raw material wood was 3.2 mm, the warp of the wood after natural drying was 2.2 mm, and the warp of the wood after artificial drying was 1.0 mm.

[Comparative Example 1]
The same as Example 1 except that the wood preservative solution does not contain a dimension stabilizing material.

  The moisture content of the raw material wood is 15%, the moisture content of the wood after pouring is 125%, the moisture content of the wood after natural drying is 42%, and the moisture content of the wood after artificial drying is 15%.

  The size of the raw material wood is 105.1 mm, the size of the wood after pouring is 108.9 mm, the size of the wood after natural drying is 107.2 mm, and the size of the wood after artificial drying Was 105.8 mm.

  The warp of the raw material wood was 3.4 mm, the warp of the wood after natural drying was 3.0 mm, and the warp of the wood after artificial drying was 2.5 mm.

[Example 2]
As wood, the same as Example 1 except that solid wood of cedar species: cedar was used.

  As a result, the moisture content of the raw material wood is 13%, the moisture content of the wood after pouring is 132%, the moisture content of the wood after natural drying is 49%, and the moisture content of the wood after artificial drying is The water content was 15%.

  The size of the raw material wood is 105.1 mm, the size of the wood after pouring is 109.3 mm, the size of the wood after natural drying is 109.6 mm, and the size of the wood after artificial drying Was 109.3 mm.

  The warp of the raw material wood was 0.6 mm, the warp of the wood after natural drying was 0.2 mm, and the warp of the wood after artificial drying was 0.1 mm.

[Comparative Example 2]
The same as Example 2 except that the wood preservative solution does not contain a dimension stabilizing material.

  As a result, the moisture content of the raw material wood is 13%, the moisture content of the wood after pouring is 126%, the moisture content of the wood after natural drying is 39%, and the moisture content of the wood after artificial drying is The water content was 14%.

  The size of the raw material wood is 105.0 mm, the size of the wood after pouring is 109.1 mm, the size of the wood after natural drying is 107.6 mm, and the size of the wood after artificial drying Was 105.5 mm.

  The warp of the raw material wood was 0.6 mm, the warp of the wood after natural drying was 0.6 mm, and the warp of the wood after artificial drying was 0.7 mm.

  The results are summarized in Table 1.

  From the results shown in Table 1, in Examples 1 and 2 in which a wood preservative solution containing a dimensional stabilizer was injected in the chemical injection step, the wood preservative solution was injected to dry the expanded wood. However, the wood hardly shrunk and the wood remained expanded. The wood obtained by drying could be adjusted to a predetermined cross-sectional dimension of about 105 mm square before pouring the wood preservative solution by molding. By adjusting the dimensions in this way, a modified wood having the same cross-sectional dimensions as before injection of the wood preservative solution was obtained with high dimensional accuracy. Therefore, the modified wood into which the wood preservative was injected could be produced with high dimensional accuracy without using wood larger than the target size as the raw material wood.

  On the other hand, in Comparative Example 1 and Comparative Example 2 in which a wood preservative solution that does not contain a dimensional stabilizer was injected in the chemical injection step, the wood preservative solution was injected to dry the expanded wood. Contracted. Even if deformation such as cracking and warping occurred in the surface layer portion, the dimensions could not be adjusted by molding.

  Moreover, compared with the comparative example 1 and the comparative example 2, the curvature after drying of Example 1 and Example 2 was small. Also from this, according to the manufacturing method according to the present invention, even when the wood preservative solution is injected and the expanded wood is dried, the wood hardly shrinks, so that deformation of the wood due to dimensional changes during drying is suppressed. I understand that I can do it. Furthermore, even if wood having a somewhat large warp is used as the raw material wood, the warp or the like can be reduced.

  In addition, the modified wood obtained in Example 1 and Example 2 has a dimensional stability required when using wood as a building material, furniture material, or the like. Since the solution was poured into wood, it was superior to conventional dry wood.

It is the schematic which shows the manufacturing method of the modified wood which concerns on this invention. It is the schematic which shows the manufacturing method of the conventional modified wood.

Claims (4)

A chemical injection step of expanding the wood by injecting a wood preservative solution containing a dimensional stabilizer into wood having a moisture content of 20% or less and having a predetermined cross-sectional dimension;
A drying step of drying the solvent in the wood preservative solution injected into the wood;
A method for producing modified wood, comprising: a dimension adjusting step for processing the dried wood into the predetermined cross-sectional dimensions.   The method for producing modified wood according to claim 1, wherein the wood having the predetermined cross-sectional dimension is subjected to insizing treatment in advance.   The method for producing modified wood according to claim 1 or 2, wherein the chemical injection step is a step of pressure-injecting the wood preservative solution into the wood having the predetermined cross-sectional dimension. The method for producing modified wood according to any one of claims 1 to 3, wherein the wood preservative solution further contains at least one of a preservative and an anti-anticide.

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