WO2001032373A1

WO2001032373A1 - Wood compressing/permanent-fixing method and consolidated wood

Info

Publication number: WO2001032373A1
Application number: PCT/JP2000/006861
Authority: WO
Inventors: Kimiyoshi Kitazawa; Yorikuni Shibuya
Original assignee: Japan As Represented By Director General Of Agency Of Shinshu University; Yoshikawa Kensetsu Kabushiki Kaisha
Priority date: 1999-11-04
Filing date: 2000-10-02
Publication date: 2001-05-10
Also published as: JP2001129805A; JP3397306B2; CA2358452A1

Abstract

A wood compressing/permanent-fixing method which compresses wood and permanently fixing the compressed condition by heat-treating without drying, for practical use as lumber. A method of producing consolidated wood by heat-treating compressed wood in a consolidated condition and fixing the consolidated condition, characterized in that air-dried wood containing 12% of water is used as wood to be compressed, the air-dried wood housed in a compression mold in contact with the inner wall surface of the mold is compressed at a compression ratio of at least 50% to form compressed wood, then the compressed wood retained in the compression mold in a consolidated condition is heat-treated while kept air-tight so as to fix the compressed condition of the compressed wood.

Description

Description Method of permanent compression treatment of wood and compacted wood

The present invention relates to a method for permanently compressing and compressing wood, and more particularly to a method for compressing wood in which heat is applied to compressed and compacted wood to produce a consolidated wood by permanently fixing the compacted state. The present invention relates to a method of permanent fixing, and a method of heat-setting a compressed state of porous wood having a large number of pores, such as a tree damaged by pine wilt, and the like. Background art

Conventionally, after compressing wood such as softwood into compressed wood, heat treatment is performed by externally introducing wet steam into the container in which the compressed wood is placed in order to permanently fix the compressed state of the compressed wood. Therefore, it is known to produce a compacted wood material having the same hardness as hardwood material.

However, heat treatment of compressed wood by introducing wet steam into the container from the outside requires the container to be a pressure vessel, so it is not possible to heat a large amount of compressed wood in a large container at once. Difficult and inferior in productivity.

On the other hand, Japanese Patent Application Laid-Open No. 7-47511 discloses that a raw material having a water content of about 20% contained in a compression mold is compressed into compressed wood, and then is compressed between the inner wall surface and the material. There has been proposed a method of permanently fixing wood in which compressed wood is hermetically sealed in a closed vessel having a gap and subjected to heat treatment. Japanese Patent Application Laid-Open No. 7-88810 also discloses a method of permanently fixing wood. There has been proposed a permanent compression fixing method in which the side surface is restrained by a side restraint fixture, compressed under high temperature and humidity, and then dried in that state. Disclosure of the invention

According to the compression permanent fixing method proposed in the above-mentioned patent publication, the preservation of wood is Moisture heat treatment using the water content; can quickly fix the compressed state of the compressed wood, and the conventional permanent compression fixation that introduces wet steam from outside to the pressure vessel containing the compressed wood Compared with the treatment method, compacted wood can be manufactured with simple equipment.

However, in the compression permanent fixing method proposed in the above-mentioned patent gazette, a step of drying the obtained consolidated wood in an air-dry state is essential.

In other words, in the compression permanent fixing method proposed in Japanese Patent Application Laid-Open No. 7-47511, the obtained consolidated wood is still wood having a water content of about 20%. For this reason, in order to use it as wood for housing or wood for furniture, it is necessary to dry it into air-dried wood with a moisture content of 12% or less. Is more likely to occur.

Further, in the compression permanent fixing method proposed in Japanese Patent Application Laid-Open No. 7-88810, since the wood is subjected to a compression treatment in a high-temperature and wet state in an airtight state, the compressed wood is kept in a compressed state. In order to dry, it is necessary to break the airtight state. Attention must be paid to the temperature of the compressed wood, etc., as steam may blow out depending on the temperature when breaking this airtight state.

Furthermore, when green material is compressed, water and contents may be squeezed out of the mouth during compression, which may require disposal of waste liquid with an unpleasant odor. However, such waste liquid treatment increases the cost of producing compacted wood.

Next, conventionally, pine scab damage trees and the like have been significantly reduced in density due to the formation of many pores by nematodes and the like in the wood sapwood. For this reason, pine scab damage trees are left after incineration and chemical treatment, and it is not considered that they will be used effectively as materials.

In addition, attempts have been made to impregnate wood with various functionalizing materials in order to impart functions such as durability and fire resistance to the wood, but all of them require special equipment, etc. Wood impregnated with the imparting material could not be easily obtained.

Accordingly, a first object of the present invention is to provide a timber that can be practically used as a material without drying after compressing the wood and permanently fixing the compressed state by heat treatment. To provide a compression permanent fixing method.

Further, a second object of the present invention is to provide a method for permanently compressing wood and a compacted wood material which can be used as a material having many pores formed thereon, such as a pine scab damage tree. is there.

Further, a third object of the present invention is to provide compacted wood that can be used as a material impregnated with a function-imparting material.

The present inventors first studied to solve the first problem of the present invention. As a result, by using air-dried wood as the wood to be compressed, the wood was compressed and the compressed state was permanently fixed by heat treatment. They found that they can be used as materials without drying, and arrived at the first present invention.

That is, in the first invention, when heat treatment is performed on the compressed and compacted wood to produce the compacted wood while fixing the compacted state, the compressed wood has a moisture content of 1 as wood material to be compressed. The compressed wood is compressed by compressing the compressed wood at a compression ratio of 50% or more by compressing the dried wood stored in the compression mold by contacting the inner wall with 2% or less of the dried wood. In order to fix the state, there is provided a permanent compression fixing method for wood, characterized in that compressed wood kept in a compacted state in the compression mold is kept airtight and subjected to heat treatment.

In the first aspect of the present invention, air-dried wood having a moisture content of 5% or more is used as the air-dried wood, and the compression ratio is set to a compression ratio that allows the specific gravity of the consolidated wood to be 0.8 or more. As a result, it is possible to obtain consolidated wood having a bending strength higher than that of pure aluminum.

Further, the heating treatment of the compressed wood is performed by heating a compressed compression mold that holds the compressed wood in a compressed state while keeping the compressed wood airtight under dry heat. It does not need to be.

Further, the present inventors have studied to solve the second problem of the present invention, and as a result, when using pine cricket damage wood as the wood to be compressed, many pores are formed. The sapwood part that has been reduced in density is compressed and compacted, and a large number of pores formed in the sapwood part contain a suspension solution in which a functional material such as a heat-resistant material is suspended in alcohol or the like. Are easily absorbed, and the second to third aspects of the present invention are found. Ming has been reached.

That is, in the second invention, when heat is applied to the compressed and compacted wood to produce the compacted wood while fixing the compacted state, when the compacted wood is produced, the wood to be compressed is pine wilt damage Using porous wood having a large number of pores such as wood, the porous wood housed in a compression mold is compressed into compressed wood, and then kept in a compressed state to fix the compressed state of the compressed wood. A method for permanently compressing and fixing wood is characterized by subjecting the compressed wood to heat treatment while heating.

Further, the third invention is a consolidated wood formed by heat-setting a compressed state of a multi-porous wood having a large number of pores, such as a pine wilt damage tree, and the flexural strength of the consolidated wood. Compressed wood characterized in that it is not less than 13 OMPa. According to the second aspect of the present invention, by setting the compression ratio of the wood to a compression ratio at which the bending strength of the obtained consolidated wood is 130 MPa or more, the wood exhibiting the bending strength similar to that of Bunakaki wood is obtained. Can be obtained.

Further, the compressed wood can be easily fixed by heating the compressed wood held in a compressed state in the compression mold. In particular, the heat treatment of the compressed wood is performed by dry heat with the open surface of the compressed wood held in the compression mold in the non-contact state with the inner wall surface of the compression mold being open. By applying below, a compression mold can be easily created.

Also, by using porous wood in which a large number of pores are filled with a functional filler as the porous wood to be compressed, it is possible to obtain consolidated wood having various functionalities.

Furthermore, the present inventors have studied to solve the third problem of the present invention, and as a result, the pine wilt damage tree has a large number of pores formed in its sapwood part, and has functions such as a heat-resistant material. Suspended solution in which the conductive material is suspended in alcohol etc. is easily absorbed. In addition, the sapwood part, which has many pores formed and is reduced in density, is easily compacted by compression. They have found that uniform and consolidated wood can be obtained, and have reached the fourth invention of the present invention.

That is, the fourth invention is formed by heat-setting a porous wood such as a pine wilt damaged tree having a large number of pores formed by nematodes or the like in a sapwood portion of the wood in a compressed state. Characterized in that the pores are filled with a functional filler.

According to the second aspect of the present invention, by setting the compression ratio of the wood to a compression ratio at which the bending strength of the obtained consolidated wood is 130 MPa or more, the wood exhibiting the bending strength similar to that of Bunakaki wood is obtained. Can be obtained.

It should be noted that the “multiple pores” referred to in the present invention does not include pores inherent in wood, such as airway tubes and temporary conduits.

In the first invention, air-dried wood having a moisture content of 12% or less is used as the wood to be compressed. In the cells forming such air-dried wood, water does not exist as free water, but exists as bound water bound to cell membranes. For this reason, in the present invention, in order to quickly and permanently fix the compressed state of the compressed wood, heat treatment is performed on the compressed wood that is hermetically sealed by the compression mold and the sealing member that seals the front end of the wood. Bound water that is bound to cell membranes can be used as the required moisture for moist heat treatment.

In other words, the volume of the intracellular space decreases as the compressibility of wood increases. For this reason, permanent fixation becomes possible when the amount of bound water satisfies the conditions for the appearance of wet steam under heating conditions in compressed wood with reduced volume. For this reason, as the compression ratio increases, the compressed state of the compressed state can be permanently fixed even with air-dried wood having a low moisture content.

As a result, according to the first aspect of the present invention, after the wood is compressed and the compressed state is permanently fixed by heat treatment, the wood can be practically used as a material without drying. It is. ,

In addition, as in the second and third embodiments of the present invention, by using porous wood having a large number of pores, such as a pine wilt damage tree, as the wood to be compressed, a large number of pores are formed and the density is low. The compacted portion is compacted by compression, and it is possible to obtain compacted wood exhibiting flexural strength equal to or better than that of Japanese wood. For this reason, it is possible to effectively use pine scab damage trees and the like, which have been abandoned in the past, as materials. In addition, pine stalks with many pores formed by nematodes etc. in the sapwood of wood The porous wood such as damaged wood is a suspension of functional materials such as heat-resistant materials suspended in a solution such as alcohol. In order to easily absorb the liquid, various heat treatments are performed on the compressed wood obtained by compressing the porous wood that has previously absorbed the suspension of the functional material, as in the fourth aspect of the present invention. It is possible to obtain compacted wood to which functionality has been imparted. BRIEF DESCRIPTION OF THE FIGURES

In the drawings, FIG. 1 is a process diagram illustrating a part of the process of the method for permanently compressing and fixing wood according to the present invention, and FIG. 2 is a diagram illustrating a part of the process of the method for permanently compressing the wood according to the present invention. Fig. 3 is a graph showing a general compression curve of wood, Fig. 4 is an explanatory diagram for explaining the effect of the time of heat treatment applied to the compressed wood, and Fig. 5 is a permanent compression treatment of the wood according to the present invention. Fig. 6 is a graph showing the results of a boiling recovery test of compacted wood that has been compacted by compressive heat treatment of a plate cut out of a tree damaged by pine wilt. A graph showing the results of a bending test of compacted wood that has been subjected to compression heat treatment and compressed from a pine scab damage tree.Fig. 8 shows a plank cut from a sapwood part of birch as wood to be compressed. The effect of heat treatment time Rough, 9 to each A graph showing the results of boiling restoration test compaction timber obtained using a plate material cut from heartwood of cypress as wood subjected to compression. BEST MODE FOR CARRYING OUT THE INVENTION

One example of the method for permanently compressing and fixing wood according to the present invention will be described with reference to FIGS. 1 and 2. Will be explained. 1 and 2, the air-dried wood 10 shown in FIG. 1A is used. The moisture content of the air-dried wood 10 is 12% or less, preferably 5% or more.

After the air-dried wood 10 is sawn into a plate 12 having a rectangular cross section [FIG. 1B], the plate 12 is compressed using a compression mold 14 [FIG. 1C to FIG. E process]. The compression mold 14 is composed of a female mold 16 in which a concave portion 17 for accommodating the plate material 12 is formed, and a male mold 18 for compressing the plate material 12 inserted and accommodated in the concave portion 17. You.

As shown in FIG. 1C, the plate material 12 accommodated in the concave portion 17 of the female mold 16 has its bottom surface and both side surfaces in full contact with the inner wall surface of the concave portion 17 without any gap. The entire upper surface of the plate 12 is in contact with the compression surface of the male die 18 without any gap.

However, in some cases, the open mouth of the wood 12 (the surface where the annual rings appear) may be opened. This is because the elongation due to the compression in the axial direction of the plate material 12 does not substantially occur. In this way, the structure of the compression mold 14 can be simplified by opening the cleave surface of the plate 12.

The plate material 12 accommodated in the recess 17 of the female mold 16 of the compression mold 14 shown in FIG. 1C is compressed by the male mold 18 entering the recess 17 [step of FIG. 1D]. This compression is stopped when the compression ratio of the plate 12 reaches a predetermined value and compressed wood 20 is obtained [step in FIG. 1E].

The compression ratio of such a plate 12 varies depending on the type of wood, but it is important that the compression ratio be 50% or more.

In other words, as shown in Fig. 3, the general compression curve of wood 12 is that the initial compression area (area A) is where the compression ratio suddenly increases with a slight compression force. Area Λ is the area where the crushing in which the cells forming the wood 12 are partially crushed propagates, and when the compression is further continued, the area reaches the area B where the compression ratio is not easily improved even if the compression force is increased. Cheating. The area B is an area where the cells of the wood 12 are substantially crushed and the density is rapidly increased by compression. Therefore, in order to obtain high-density (high specific gravity) compressed wood 20, it is necessary to set the compression ratio to reach area B. The compression ratio that can reach this area B depends on the type of wood. For example, Shira Area B is compressed when it is compressed to 50% for hippo, to 60% for Calamaso, or to 67% for cedar.

As described above, the compression ratio of the plate 12 is different depending on the type of wood. By setting the compression ratio so that the specific gravity of the compressed wood 20 can be 0.8 or more, the consolidation of the bending strength is finally higher than that of pure aluminum. You can get wood.

In addition, the compression ratio mentioned here means that the thickness of the plate 12 before compression is TO, and the thickness of the compressed wood 20 after compression is T, the compression ratio (%) is [(TO-T) / T 0] expressed as X 100.

The compressed wood 20 having reached the predetermined compression ratio is held in a compressed state in the compression mold 14, and the tip of the compressed wood 20 is sealed with the member 22 [process in FIG. 2A]. The compression molds 14, 14 · ′ are placed in an electric furnace 24 and subjected to heat treatment [step in FIG. 2B]. As described above, by heating the compression mold 14 under dry heat using the electric furnace 24, the heating vessel is compared with heat treatment of the compression mold 14 under wet heat using steam or the like. Since it is not necessary to use a pressure-resistant container, the equipment cost can be reduced.

The temperature and time of the heat treatment are such that the compressed state of the compressed wood 20 can be fixed. As shown in Fig. 4, during this heat treatment time, the bending strength of the wood after the heat treatment becomes maximum, and thereafter, the wood after the heat treatment carbonizes while the bending strength gradually decreases.

Here, the time of the heat treatment in which the compressed state of the compressed wood is permanently fixed is immediately after the bending strength of the wood reaches the maximum value. In addition, the time of the heat treatment at which the bending strength is maximized tends to shift to a shorter time side as the temperature of the heat treatment becomes higher.

Therefore, it is preferable to end the heat treatment immediately after the bending strength of the wood after the heat treatment becomes maximum. For example, if the heating temperature is 180 ° C, compressed birch obtained by compressing birch with initial dimensions of 18 Omm in length, 60 mm in width and 15 mm in thickness at a compression ratio of 50% 2 The heat treatment time is preferably about 120 minutes, and the heat treatment time of compressed wood 20 obtained by compressing cypress of the same size at a compression ratio of 50% is preferably about 90 minutes. As described above, when the compression mold is heated using the electric furnace 24 under dry heat, the compressed wood 20 in the compression mold 14 is heated in a pressurized state. Even if the wood 20 is in an air-dried state with a moisture content of 12%, wet heat treatment can be performed on the compressed wood 20 held in the compression mold 14 in an airtight state. This will be described with reference to the steam diagram shown in FIG. The right side of the saturated steam line shown in the steam diagram in Fig. 5 is the superheated steam area, and the left side is the wet steam area.

Here, compressed wood 20 obtained by compressing wood in an air-dried state having a moisture content of 12% at a predetermined compression rate is heated at 180 ° C. while maintaining the compressed state. When the degree is insufficient, for example, when the compression ratio (ε) is 25%, the heat treatment is performed in the superheated steam region, and the heat treatment time until the compression state can be fixed becomes long. As described above, if the duration of the heat treatment is long, the productivity of the consolidated wood is reduced, and the physical properties such as the bending strength of the obtained consolidated wood are likely to be poor.

On the other hand, in the case of compressed wood 20 having a sufficiently high degree of compression, for example, when the compression ratio (£) is 50% or more, the compressed wood 20 is kept at 180 ° C while maintaining its compressed state. When the heating is performed in the range, the heat treatment is performed in the wet steam region, and the heat treatment time until the compressed state can be fixed can be shorter than the heat treatment time in the superheated steam region. As described above, if the duration of the heat treatment can be shortened, the productivity of the consolidated wood can be improved, and the physical properties such as the bending strength of the obtained consolidated wood can be improved. .

After a predetermined heating time has elapsed, the compression mold 14 is cooled to around room temperature, and then the male mold 18 and the female mold 16 are opened to take out the consolidated wood 26 [Fig. 2C process]. .

The obtained consolidated wood 26 was subjected to a boiling restoration test in which it was immersed in boiling water for a predetermined period of time, and the shape restoration rate was about 10%. The reversion rate becomes approximately 0% and returns to the shape before the boiling reversion test. Therefore, the compacted wood 26 has its compression state permanently fixed. Moreover, the flexural strength of the consolidated wood 26 can be 200 MPa or more in the dry state. Such bending strength is a value equal to or higher than the bending strength of pure aluminum.

When the birch, larch, and cypress boards 12 containing crab are used as the boards 12, the entire consolidated wood 26 obtained is black-brown. This is because the material contained in the plate 12 is dispersed in the entire plate 12 by heat treatment under compression and denatured to become dark brown. The denatured crab does not exude to the surface and does not exhibit stickiness or the like. Therefore, even in the case of conventional ramak materials, which had previously been used in large amounts, and which could not be used for flooring and other materials, a large amount of ash was gradually oozed to the surface, and the compression heat treatment disperses and denatures slag in wood. It can also be used for flooring and other materials. In addition, it is considered that the heat-denatured wood in the wood plays a role of a toughening agent, which also affects the strength improvement of the compacted wood 26.

In addition, in the case of calama wood, there are cases where scum pools are present in the wood.However, since the scum of the two pools is also dispersed and modified in the wood, the scum pool is located on the surface of the consolidated wood. Even if it appears, only traces remain, and there is no practical problem.

In the method for permanently compressing and fixing wood shown in FIGS. 1 and 2, the board 12 is used as the wood to be compressed, but it may be a log. Here, when compressing the log, the timber can be easily obtained by biaxially compressing the log.

Further, as the plate 12, it is possible to use a plate cut out of a tree damaged by pine scab, having many pores formed by nematodes or the like in a sapwood portion of wood. The plate material cut from the pine stake damage tree is a multi-hole plate material with many pores formed and reduced density. Such a perforated plate can be made into compacted wood which has been compacted by the compression heat treatment method shown in FIGS. As shown in Fig. 6, the compacted wood obtained by using a board cut out from red pine, which is a tree damaged by pine worms, has a shape recovery rate of about When it was air-dried after the boiling recovery test, the shape recovery rate was It becomes approximately 0% and returns to the shape before the boiling restoration test. Therefore, it is possible to obtain compacted wood whose compression state is permanently fixed from the perforated plate. -In addition, when the bending strength of the obtained consolidated wood is measured, as shown in Fig. 7, the bending strength shows 130 MPa or more in the air-dried state. Since this value is equal to or greater than the bending strength of beech or zelkova plate, the compacted wood obtained by using the perforated plate as a raw material can be used for various purposes.

However, the perforated plate used as a raw material has many pores, so that the finally obtained consolidated wood is more water-absorbing than the consolidated wood obtained using ordinary plate. Is good. Therefore, it can be used for scented wood and the like by impregnating with fragrances and the like.

In addition, the plate material cut out from the red pine, which is a tree damaged by pine scabs, has a hole that may have holes formed by razor bugs. This hole is also closed by compression heat treatment, and the bending strength of the obtained consolidated wood is Also close to beech and zelkova boards.

In this way, the boards cut out from the trees damaged by pine scab may have holes or the like in which the worms have been drilled, but hardly any scabs are included. For this reason, although the obtained compacted wood turns brown, there may be noticeable holes and the like made by the horny insects. For this reason, it is preferable that the surface of the compacted wood is made black-brown so that the holes and the like made by the horny insects and the like are not noticeable. For this purpose, the surface of the compacted wood can be made dark brown by increasing the heat treatment time of the compressed wood 24 held in the compacted mold 14 in the compacted state. Moreover, by performing the heat treatment with the open end of the compressed wood 24, the heat treatment time is longer and the heat treatment temperature is higher than when the compressed wood 24 is heat-treated in an airtight state. (Approx. 5 hours at 220 ° C) Even when set, the surface of the consolidated wood can be dark brown.

Even when such a pine scab damage tree is used, the pine scab damage tree can be used in a log shape. When compressing pine stake insect damaged trees in a log shape, square wood can be easily obtained by biaxially compressing the pine stake insect damaged trees.

Here, when the pine scab damage wood was used in the form of a log and heat-treated in a state of biaxial lateral compression to obtain compacted timber, the square shape was good and obtained. The surface layer of the consolidated wood is intensively consolidated and uniform. The trees affected by pine scabs are usually densified by a large number of pores formed by nematodes in the sapwood, so that the compressive force is concentrated on the sapwood with reduced density. It is thought that it worked.

The perforated plate cut out from the pine wilt damage tree has many pores and is highly water-absorbent. For this reason, a porous plate made of a functional filler such as a heat-resistant agent made of an inorganic substance suspended in a solution of alcohol or the like is subjected to compression heat treatment in the process shown in Figs. A compacted wood impregnated with a functional filler can be obtained. As such a functional filler, for example, silica, alumina, lime, titanium oxide, glass, cement, and the like can be used as a material for storing, durable, and fire-resistant storage, durability, and fire resistance. Further, by impregnating the luminescent material into the perforated plate, it is possible to obtain compacted wood that emits a grain pattern at night. Such a luminescent material may be impregnated into a perforated plate together with a material for imparting storage / durability / fire resistance such as siri force. These functional fillers are preferably suspended in a solution, impregnated in porous wood, and then subjected to compression heat treatment of the dried porous plate material by evaporating the solution. For this reason, it is preferable to use an alcohol such as ethyl alcohol which easily evaporates as the solution.

As described above, when the porous wood that has absorbed the suspension in which the functional filler is suspended is subjected to compression heat treatment, the porous log in which the suspension in which the functional filler is suspended is absorbed is also used. Is also good. Here, when compressing the perforated log, the rectangular log impregnated with the functional filler can be easily obtained by biaxially compressing the perforated log.

Pine stake damage trees are usually made dense by the formation of a large number of pores in the sapwood by nematodes, etc., but no pores are formed in the heartwood by nematodes, etc. Due to the dense structure, the functional filler is mainly impregnated into the sapwood part. Therefore, in the obtained consolidated wood, the surface layer mainly impregnated with the functional filler plays a role as a part where various functions are exerted, and the center part mainly serves as a strong support. Plays the role of. Also, in this case, when performing the heat treatment on the compressed wood 24 held in the compression mold 14 in a compacted state, by performing the heat treatment with the open end of the compressed wood 24 open, The heat treatment time is longer than when the compressed wood 24 is heat-treated in an airtight state. As described above, it is preferable to lengthen the heat treatment time so that the surface of the compacted wood is black-brown, so that holes formed by razor-sharp insects and the like and discolored portions due to mold are not conspicuous.

In the above description, the pine wilt damage tree was used as the perforated plate and the perforated log. However, the perforated plate and the perforated log in which a large number of pores were artificially formed in a sound material by a known method were used. You may. Example 1

A 180 mm long, 60 mm wide, 15 mm thick plate (sapwood) cut from an air-dried birch log was used to compress the female mold of the compression mold 14 and the recess of the female mold 17 Set inside. Although the open end of the plate was open, the entire bottom surface and the entire sides of the plate were in contact with the inner wall surface of the recess 17 without any gap. Next, the male mold 18 of the compression mold 14 was inserted into the recess 17, and the entire upper surface of the plate was compressed by the compression face of the male mold 18. The compression ratio at this time was set to 50%. The thickness of the compressed wood after compression was 1 Z 2 of the thickness of the plate before compression. The compressed wood was sealed with a sealing member while keeping its compressed state with the compression mold 14 and then kept in an electric furnace maintained at 180 ° C for 120 minutes. Was subjected to a heat treatment. After that, the compression mold 14 taken out of the electric furnace was air-cooled, and then the compacted wood was taken out. The resulting consolidated wood is colored blackish brown.

Consolidated wood was obtained in the same manner except that the heat treatment time was 60 minutes. The obtained consolidated wood had a very low degree of black-brown coloring compared to the consolidated wood in which the heat treatment time was 120 minutes. Example 2

Cut the compacted wood obtained in Example 1 from a point 5 mm from the edge of the wood. The test piece thus taken out was immersed in boiling to conduct a boiling recovery test. Figure 8 shows the results. As is evident from Fig. 8, the heat recovery time of the compacted wood for 120 minutes is about 10%, and when it is air-dried after the boiling recovery test, the shape before the boiling recovery test is obtained. Return to. Therefore, it can be seen that the compressed state of the consolidated wood with a heat treatment time of 120 minutes is permanently fixed.

On the other hand, compacted wood with a heat treatment time of 60 minutes has a shape recovery rate of about 90%, and the shape recovery rate is 80% even when it is air-dried after the boiling recovery test. Therefore, it can be seen that the compacted wood with a heat treatment time of 60 minutes is insufficiently fixed in its compressed state and is not permanently fixed. Example 3

The compression heat treatment was performed in the same manner as in Example 1 except that the heat treatment time was changed to 90 minutes. Although the obtained consolidated wood is colored black-brown, the degree of coloring is less than that of the consolidated wood in which the heat treatment time was 120 minutes.

The bending strength of the obtained consolidated wood was measured by a static three-point bending test and found to be 200 MPa. This value is superior to the bending strength of pure aluminum. Example 4

In Example 1, a compression heat treatment was performed in the same manner as in Example 1, except that a cypress core material was used as a plate material to be compressed, the compression ratio was 67%, and the heat treatment time was 90 minutes. The resulting compacted wood had a color that was colored blackish brown and a strong smell of cypress. As shown in Fig. 9, the result of the boiling restoration test of this consolidated wood was one in which the compressed state was sufficiently fixed and the bending strength exhibited 200 lPa. Example 5

Pine wood was cut out of the sapwood of the red pine, which was damaged by pine wilt. This plate is long The dimensions are 18 O mm, width 60 mm, and thickness 15 mm.

This plate material was set in the recess 17 of the female mold 16 of the compression mold 14. Although the cleave surface of this plate was open, the entire bottom surface and the entire side surfaces of the plate were in contact with the inner wall surface of the recess 17.

Next, the male mold 18 of the compression mold 14 was inserted into the recess 17, and the entire upper surface of the plate was compressed by the compression face of the male mold 18. The compression ratio at this time was 67%. The thickness of the compressed wood after compression was 1 Z 3 of the thickness of the plate before compression. The compressed wood was sealed with a sealing member while keeping the state compressed by the compression mold 14 with a sealing member.Then, the compressed wood was kept in an electric furnace maintained at 180 ° C for 90 minutes. Heat treatment was applied. Thereafter, the compression mold 14 taken out of the electric furnace was air-cooled, and then the compacted wood was taken out. The resulting consolidated wood was colored black-brown.

A boiling restoration test of the obtained consolidated wood was performed in the same manner as in Example 2, and the results are shown in FIG. As is clear from Fig. 6, the obtained compacted wood is one in which the compressed state is sufficiently fixed.

Figure 7 shows the results of measuring the bending strength of the obtained consolidated wood by a static three-point bending test. The flexural strength was 130 MPa or more, exhibiting a flexural strength equal to or higher than that of the plate of Bunakaki. Example 6

After compressing the red pine lumber in a log-shaped tree damaged by pine trees biaxially in the form of a bark and compressing it into squares, a compression type that holds the compressed state of the squares with the open mouth surface is used. Heat treatment was performed in an electric furnace at 0 ° C for 5 hours. The obtained sapwood has a sapwood part in which a large number of pores are formed by nematodes or the like, and is compacted to be uniform. For this reason, it is possible to use red pine lumber damaged by pine scabs as compacted square lumber. Industrial applicability

According to the present invention, wood is compressed and the compression state is permanently fixed by heat treatment. The compacted wood can be put to practical use as a material without drying, and the productivity and manufacturing cost of the compacted wood can be reduced. -In addition, woods with many pores, such as pine scab damage trees, which have been disposed of conventionally, can be effectively used as lumber.

Further, it is possible to provide consolidated wood impregnated with a functional-imparting material, which has been difficult in the past, and the wood can be used for new applications.

Claims

Claims. When heat-treating the compressed and compacted wood to permanently fix the compacted state to produce compacted wood,

Air-dried wood having a moisture content of 12% or less is used as the wood to be compressed, and the air-dried wood stored in a compression mold in contact with the inner wall surface is compressed at a compression rate of 50% or more. After making wood,

A method for permanently fixing wood, wherein the compressed wood held in a compacted state in the compression mold is heated in an airtight manner to fix the compressed state of the compressed wood. 2. The method for permanently compressing and fixing wood according to claim 1, wherein the wood is an air-dried wood having a moisture content of 5% or more. The method for permanently fixing wood according to claim 1, wherein the compression ratio is a compression ratio that allows the specific gravity of the consolidated wood to be 0.8 or more. 2. The method for permanent compression treatment of wood according to claim 1, wherein the heat treatment of the compressed wood is performed by heating, under dry heat, a compression mold that keeps the compressed wood in a compressed state and airtightly. When heat-treating the compressed and compacted wood and fixing the compacted state to produce compacted wood,

As the wood to be compressed, a porous wood having a large number of pores such as a pine wilt insect damage tree is used, and the porous wood stored in the compression mold is compressed into compressed wood.

A method of permanently compressing wood, wherein the compressed wood is subjected to a heat treatment while being kept in a compressed state in order to fix the compressed state of the compressed wood.

6. The permanent compression fixing method for wood according to claim 5, wherein the compression rate of the wood is a compression rate at which the bending strength of the obtained consolidated wood is 130 MPa or more. 6. The permanent compression fixing method for wood according to claim 5, wherein the heat treatment of the compressed wood is performed on the compressed wood held in a compression mold in a compressed state. The heat treatment of the compressed wood is performed under dry heat with the surface of the compressed wood held in the compression mold in a compressed state, the surface not in contact with the inner wall surface of the compression mold being opened. 5. The method for permanently fixing wood for compression according to 5. 6. The permanent compression fixing method for wood according to claim 5, wherein the porous wood to be compressed is multi-porous wood having a number of pores filled with a functional filler. 0. Consolidated wood that is formed by heat-setting porous wood such as pine wilt-affected trees, which have many pores formed by nematodes, etc., in the sapwood of the wood, in a compressed state. Compressed wood, wherein the bending strength of the wood is at least 130 MPa. 1. Consolidated wood formed by heat-setting porous wood such as pine wilt-affected trees in which many pores are formed by nematodes etc. in the sapwood part of the wood in a compressed state, Compacted wood characterized in that a functional filler is filled therein.