JPH0752108A - Heat treating method of wooden material - Google Patents

Abstract

PURPOSE:To obtain a densely pressurized wooden material having surface characteristics which will never be affected by the surface characteristics of an employed hot press, in the heat treating method of a wooden material for obtaining a densely pressurized wooden material. CONSTITUTION:A wooden material W is pinched between the hot boards 1a, 1b of a clamping device and the like under a sealed condition obtained by a sealing material 2 arranged around the wooden material W, then, compression and heating are effected to densely pressurize the same material W. In this case, sheet type members S, S' are arranged between the surfaces of the treated wooden material W and the hot platen 1a, 1b to pressurize it densely. When silicone rubber sheets are employed as the sheet type members, air-tight property is improved in addition to the improvement of surface characteristics. According to this method, higher densely pressurizing effect can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat treatment method for wood materials, and more particularly, it improves the dimensional stability and surface characteristics of the wood material by consolidating the wood material so that the wood material can be effectively used for construction or furniture. The present invention relates to a heat treatment method for a consolidated wood material, wherein the obtained consolidated wood material has surface characteristics that are not affected by the surface characteristics of the hot platen used during consolidation.

[0002]

2. Description of the Related Art In recent years, high-quality hardwood materials have decreased and it is no longer possible to obtain a sufficient supply. Therefore, softwood materials, medium-quality fiberboard (MDF), particle board and the like are attracting attention as alternative materials for hardwood materials. However, softwoods are generally softer than hardwoods, and to be used as building or furniture materials, surface properties such as surface hardness and surface abrasion resistance, durability against moisture and heat, and strength, etc. There was a problem. Swelling of MDF and particle board in the thickness direction with respect to water has been a serious problem.

For this reason, softwood is boiled or steamed to be softened, and then hot pressed with a flat plate press to consolidate the softwood to a thickness of about 20 to 70% of the initial thickness. Is publicly known. When the softwood is consolidated, the above-mentioned surface properties, durability, and strength can be obtained significantly, but the consolidated softwood material tends to return to its original state by the action of one or both of water and heat. There was a drawback that the softwood material that had been strengthened and improved in performance was restored to near its original state due to the force.

A method for preventing restoration of the consolidated wood material by putting the consolidated wood material in an autoclave and treating it with high-pressure steam at 160 to 220 ° C. for several minutes has been proposed. It was difficult for the high-pressure steam to penetrate into the wood material (especially in the middle part of the wood material), the treatment effect was not uniform, and the treatment condition of the center portion and the peripheral portion of the wood material sometimes differed.

The Applicant has conducted extensive studies to solve the inconveniences of the conventional methods for treating wood materials, and not only prevents the consolidated wood materials from being restored to their original thickness by moisture or heat, but also A new treatment method for wood materials, which can uniformly and efficiently process wood materials over the entire wood material, has been devised and already filed (Japanese Patent Application No. 5-28957).
No. 5-289895).

[0006] This processing method is a method of using a pressing device having a heating plate used in conventional wood processing without processing the wood material in the autoclave, and processing between the heating plates of the pressing device. The wooden material that should be placed is placed around it, and an elastic sealing material such as elastic silicon material is placed around it, or a frame that can compress the peripheral edge of the wooden material is placed around the wooden material, and stainless steel material is placed around it. After arranging a required thickness control jig such as, the wood material is heated and compressed by the hot platen, which is a method of consolidating the wood material by vaporizing the water content of the wood material itself, Since it can be performed using a pressing device having an ordinary hot platen used for pressing wood and manufacturing composite materials, it has an advantage that the process itself is simplified.

Further, in view of the so-called batch treatment method of the heat treatment of the wood material according to the above proposal, the present applicant further devised and applied for a new treatment method capable of continuously treating it. (Japanese Patent Application No. 5-165723)
issue). In this treatment method, a wood material is provided between a pair of endless belt-shaped heating plates which have areas facing each other and are arranged so that the surfaces facing each other move in the same direction. Supply with the thickness control jig and
The wood material is compressed and heated to be consolidated while the wood material passes between the endless belts. This method has the advantage that productivity can be increased because continuous processing can be performed.

[0008]

DISCLOSURE OF THE INVENTION The heat treatment method for wood materials utilizing the above-described pressing device having a flat plate-shaped heating plate or the pressing device having an endless belt-shaped heating plate is effective in itself. However, the Applicant has perceived that there are some points to be improved in the course of continuing the experiment and research.

For example, in recent years, not only the flat and glossy surface properties of compacted wood materials but also those having a fine design such as having fine irregularities are being demanded. The heat treatment method described above is basically based on the assumption that the surface of the hot platen that is used regardless of the flat plate shape or the endless belt shape is used as the heating and consolidation surface, and the surface of the wood material to be treated is the surface of the hot platen. Depending on the state, it is not possible to obtain one with more or different surface characteristics (note that a thin mirror plate may be placed on the hot platen for consolidation processing, in which case Therefore, the term "hot platen" as used herein means both a hot platen alone and a plate having a mirror plate placed on the surface of the hot platen). The surface of the hot platen is usually a mirror surface, and the surface of the obtained consolidated wood material is usually flat and glossy. Of course, it is possible to obtain a consolidated wood material with a matte surface using a special hot platen with fine unevenness (embossing), but with the same hot plate the surface is flat and glossy Can't get one,
There is an inconvenience that the application is not versatile.

Further, depending on the difference in the surface condition of the wood material to be treated or the difference in the heat treatment conditions, the compacted wood material after the heat treatment may not be smoothly separated from the hot platen, and the workability may be deteriorated. May bring. This is a particular problem when using an endless belt type heating plate. Furthermore, depending on the physical properties of the wood material to be treated and the treatment conditions, the water vapor pressure inside the enclosed space will become extremely high, and the elastic sealing material composed of elastic silicon material will move or deform under the influence of that pressure. As a result, the generated water vapor may not be kept airtight.

The present invention aims to further improve the heat treatment method for wood materials that the present applicant has already proposed, and more specifically, it is not affected by the surface characteristics of the heating plate regardless of its shape. It is an object of the present invention to provide a heat treatment method for a wood material that can obtain a consolidated wood material having surface characteristics. Another object of the present invention is to provide a heat treatment method for a wood material, which facilitates smooth separation between the consolidated wood material after heat treatment and the heating plate, thereby improving workability.

Still another object of the present invention is to provide a heat treatment method for a wood material which is capable of performing a stable consolidation treatment regardless of treatment conditions by further improving the sealing property.

[0013]

In order to achieve the above-mentioned object, the present invention is basically a method for heat-treating a wood material by sandwiching the wood material between hot plates in a sealed state, A wood material, characterized in that a sheet-like member is arranged between one or both surfaces of the wood material to be treated and the heating plate, and the wood plate is compressed and heated by the heating plate in that state to be consolidated. The heat treatment method is disclosed.

The hot platen referred to in the present invention may be a flat plate-shaped hot plate used in a normal pressing device, and may be an endless belt or a roll used in a conventionally known belt press or roll press. It may be a hot plate. In addition, a mode of hermetically sandwiching the wood material between the hot plates is also optional,
A mode in which a sealing material and a required thickness control jig are arranged around a wood material to be processed, and compression and sealing are performed by a hot platen in that state (this mode is a prior application of the present applicant) Flat 5
No. 28957)), instead of arranging the sealing material around the wood to be treated, a frame that can compress the periphery of the wood is arranged around the wood, and A mode in which a required thickness control jig is arranged around the material, and compression and sealing are performed by a hot platen in that state (this mode is disclosed in Japanese Patent Application No. 5-28958 filed by the present applicant). Further, the heating plate has an endless belt shape, and a wood material is provided between the pair of endless belt-shaped heating plates around which a sealing material and a required thickness control jig are provided. And the wood material is supplied in a state of being arranged and the wood material is compressed and sealed while the wood material passes between the endless belt-shaped heating plates (this embodiment is a prior application of the applicant). Wishhei 5-1657
23), etc. are effective.

In any case, the thickness control jig is arranged to limit the distance between the heating plates for the purpose of defining the thickness of the wood material after the heat treatment, and in the case of the sealing material. Unlike, the purpose is achieved if it is arranged along at least two opposite sides of the wood material. In the present invention, the wood material includes not only solid wood but also processed materials such as MDF and particle board, and the same purpose can be achieved. Further, although the effect is particularly exerted by applying the present invention to a softwood material which is generally considered to be soft as a solid material, it can also be applied to a hardwood material.

High-frequency heating including microwave heating (hereinafter referred to as high-frequency heating) may be used as the heating means, and a known microwave generator or high-frequency generator near the wood material to be treated in that case. Be prepared. The sheet-shaped member is arbitrary as long as it has heat resistance, and is appropriately selected and used according to the purpose. Also,
The thickness of the sheet-like member is also arbitrary, but it is particularly preferable that it is about 0.3 to 1.0 mm, preferably about 0.3 to 0.5 mm. As an example of the sheet-shaped member, for example, when it is intended to improve the designability by changing the surface characteristics of the wood material after consolidation, for example, an epoxy resin, phenol with a suitable embossed surface A resin film such as a resin based resin, or a sheet-shaped member such as a silicon based resin is suitable, and when it is desired to improve the separation between the wooden material and the hot plate after consolidation, a Teflon sheet, a silicon-coated paper, a release paper A sheet-shaped member such as is suitable, and a sheet-shaped member such as a silicone rubber sheet is suitable when the sealing property is to be improved.

In particular, when a silicon rubber sheet is used as the sheet-shaped member, due to the high airtightness and adhesiveness of the silicon rubber sheet, the sealing property between the sealing member arranged around the wooden material and the heating plate is improved. It is possible to further increase the temperature, and it is possible to more reliably prevent the steam generated from the inside of the wood material from flowing out to the outside, and a product with high consolidation can be obtained, and at the same time, due to the elasticity of the silicone rubber sheet. There is an effect that it is possible to obtain a consolidated product having a higher design property, which has unevenness on the surface according to the hardness distribution of the wood material surface.

Such a sheet-like member may be arranged only on one surface side of the wood material or on both surface sides. Hereinafter, a preferred embodiment of the heat treatment method for wood materials according to the present invention is shown in FIG.
The present invention will be described in more detail by explaining with reference to FIGS. 2 and 3.

FIG. 1 shows a state in which the present invention is applied to the heat treatment method disclosed in Japanese Patent Application No. 5-28957 filed by the applicant of the present invention.
The sheet-like member S is arranged on the lower heating plate 1a of a and 1b. A wood material W having a predetermined thickness and size is placed on the sheet-like member S, and then the wood material W
The elastic sealing material 2 having a height slightly higher than the thickness of the wood material as the final product is arranged on four laps of the above, and the thickness regulation treatment of the same height as the thickness of the wood material as the final product is further arranged on the four laps. Ingredient 3
To place. Next, the sheet-like member S ′ is arranged from above on the elastic sealing material 2 installed at least on the four circumferences of the wood material W. The sheet-shaped member S ′ may be made of the same material as the already arranged sheet-shaped member S or may be made of a different material. As described above, it is appropriately selected according to the purpose.

Further, the elastic sealing material 2 may be a material having a heat-sealing property and a compressive property, which has a sealing function of preventing water vapor generated from the inside of the wood material from leaking to the outside when the wood material W is heated. Packing materials are particularly preferred. Further, as the material of the thickness regulating jig 3, any member having required rigidity and heat resistance can be used, but aluminum alloy, stainless steel, etc. are preferable, and stainless steel is particularly preferable.

At the time of heat treatment, the sheet-shaped member S, the wood material W, the elastic sealing material 2, the thickness control jig 3, and the sheet-shaped member S ′ arranged on the sheet-shaped member S arranged on the hot platen 1a are already treated. One of the heating plates 1b is brought close to the sheet-shaped member S ', and the heating plates 1a and 1b perform the primary heating at that position. It is desirable that the heating is performed at a temperature at which water inside the wood material can be evaporated. This heating softens the wood material W to some extent (note that this primary heating is not always necessary). In this state, the heating plates 1a and 1b are brought closer until they are regulated by the thickness regulating jig 3. As a result, the wood material W is compressed and the four circumferences of the wood material are placed in a sealed state by the surrounding sealing material 2 and the sheet-like materials S and S ′ arranged above and below.

In that state, the secondary heating by the heating plate is performed. It is necessary that the heating temperature at this time is equal to or higher than the temperature at which the water contained in the wood material evaporates. The heating temperature may be changed stepwise, for example, by initially setting the temperature to about 200 ° C. and gradually lowering the temperature, or by heating at a lower temperature after the elapse of a predetermined time, the discoloration of the surface of the wood material due to heat is prevented. It is possible to prevent it as much as possible.

As the heating means, high-frequency heating may be used instead of heating with a heating plate. In this case, a more uniform heat treatment is performed because water is uniformly vaporized from the inside of the wood material. In still another aspect, heating with a heating plate and high frequency heating are performed simultaneously. In this case, the processing cycle can be further shortened. After the predetermined heating is completed, the pressure is released. The decompression may be performed gradually over a certain period of time, and although not shown in particular, the hot plates 1a, 1
Cooling water may be supplied to b to perform the so-called cold state. According to the experiment, when the decompression is performed in the cold state, the dimensional change rate of the final product obtained is smaller than that in the case of other decompression, and the surface state is finished beautifully.

In the method of the present invention, the heating plates 1a and 1b are used.
The sheet-like members S and S ′ are interposed between and the surface of the wood material W. It has many advantages. For example, the surface characteristics of the wooden material W after consolidation are influenced by the surface characteristics of the sheet-shaped member regardless of the surface characteristics of the hot platen. That is, even if the surface of the hot platen is a mirror surface, by using a sheet-shaped member that has been appropriately embossed, a compacted wood material with a high design that is matte or has unevenness on the surface. On the contrary, even if a hot platen having fine irregularities due to damage or the like is used on the surface, if a sheet-like member having a smooth surface such as a PET resin sheet is used, the surface has a flat gloss. It is possible to obtain the existing wood material.

Further, when the heat-treated consolidated wood material and the heating plate are not smoothly separated from each other due to the surface condition of the wood material to be treated or the heat treatment condition, it is possible to use a material such as silicon-coated paper or release paper. By using the material as the sheet-shaped member, the separation can be facilitated and the reduction of the processing efficiency can be avoided. Further, since the airtightness is further improved by interposing the sheet-shaped member, it is possible to completely prevent the steam generated from the inside of the wood material from leaking to the outside. Thereby, consolidation is further promoted. In particular, when a silicon rubber sheet is used as the sheet-shaped members S and S ′, the high adhesiveness of the silicon rubber sheet improves the sealing performance as described above, and at the same time, the high elastic modulus of the silicon rubber sheet causes the wooden material to be It is possible to obtain a consolidated product having a higher design property, which has unevenness on the surface according to the hardness distribution of the surface.

FIG. 2 shows another embodiment of the heat treatment method for wood materials according to the present invention. This embodiment is the same as the heat treatment method disclosed in Japanese Patent Application No. 5-28958 filed by the applicant of the present application. It shows a state to which the present invention is applied. In this example, the elastic sealing material 2 used in the method of FIG. 1 is not used, and the frame body 5 made of an aluminum material, a stainless material or the like is arranged on the peripheral portions of the upper surface and the back surface of the wood material W. . Further, the thickness regulating jig 3 is arranged only along the two opposite sides of the wood material W. Except for those points, it is the same as the case of FIG. 1, and therefore, the detailed description is omitted by giving the same reference numerals to the drawing.

During the heat treatment, the wood material is compressed by the movement of the hot platen, but at this time, the peripheral portion of the wood material is compressed more than the central portion due to the existence of the frame bodies 5. Thereby,
The peripheral portion of the wood material has a sealing function, and the water vapor generated inside the wood material is confined inside without leaking outside, and the wood material is consolidated. Details of the consolidation are shown in Japanese Patent Application No. 5-28958.

Also in this embodiment, the sheet-like member S arranged on the heating plate 1a and the sheet-like member S'arranged on the wooden material W fulfill the same function and effect as described in FIG. Easy to understand. FIG. 3 shows still another embodiment of the heat treatment method for wood materials according to the present invention,
As an example of using an endless belt-shaped or roll-shaped hot plate used for a belt press or a roll press, Japanese Patent Application No. 4-16572 of the above-mentioned applicant's earlier application described above is used.
3 shows a state in which the present invention is applied to a heat treatment method using an endless belt type hot plate disclosed in No. 3.

In this example, a suitable heater 34, serving as a heating means, is provided at the facing portion of the pair of endless belts 10 and 20 which face each other and rotate in the same direction (direction of arrow A).
· Built-in pressure roller 33 · · · Hydraulic cylinder 31,
A plurality of actuators 30 each including a piston 32 are provided so as to be pressed toward the endless belt 10. In the illustrated case, the upper endless belt 1
Although shown only for 0, the lower endless belt 20 is also provided with similar heating means.

Further, as shown in FIG. 4, two elastic sealing members 23, 23 on the left and right and an elastic sealing member 24 in the transverse direction are provided on the peripheral surface of the lower endless belt 20 over the entire circumference thereof. Two thickness control jigs 25, 2 on the left and right
5 are provided. The wood material W to be treated is placed in the space S formed by the elastic sealing members 23 and 24 of the lower endless belt 20 and fed into the portions of the pair of endless belts 10 and 20 facing each other. At that time, as shown in FIG. 3, a sheet-like member S ′ is arranged above the wood material W (even if a sheet-like member S having an appropriate size is arranged also on the bottom surface of the space S). Good).

In this state, the wood material W is the endless belt 10,
While passing through the gaps between 20 and 20, it is compressed until it is regulated by the thickness regulating jigs 25 and is heated by the heating rollers 33, ... Japanese Patent Application No. 4-165723). This method has the advantage that productivity can be increased because continuous processing can be performed, but here again, the sheet-like member S disposed between the endless belts 10 and 20 that function as a heating plate and the wood material W. , S'will perform the same functions and effects as described in FIG. 1, and it will be obvious without any explanation. Furthermore, the above description is only one example of the case where the present invention is carried out by an apparatus having an endless belt type heating plate, and as an endless belt type or roll type heating plate, a conventionally known belt press or roll press can be used. It will be readily appreciated that any of those used may be used.

In any of the above aspects of the present invention, it is not essential to dispose the sheet-shaped member on both surfaces where the wood material is in contact with the heating plate in order to carry out consolidation by arranging it on only one surface. The heating by the heating platen is not limited to the heating by both the upper and lower heating plates, but depending on the thickness of the wood material and the application required for the consolidated wood material, one heating plate may be used. It may be. In that case, the sheet-shaped member is naturally arranged on the side of the heating plate to be heated.

In another embodiment of the present invention, an initial thickness of the wood material placed on the hot platen may be approximately the same as the desired final product thickness. In this case, the wood material is not particularly compressed, and the hot platen approaches from the beginning until it is regulated by the thickness regulating jig. In that state, heating with a heating plate and / or high frequency is performed. When it is necessary to densify and improve the surface condition like softwood, it is preferable to prepare a material thicker than the final product. In the case of a material such as a particle board that does not need to be consolidated, it is possible to prepare a material having almost the same thickness as the final product and perform the treatment without consolidation.

Further, in the case of a material produced by reworking an intermediate material such as MDF or particle board as the material, the treatment according to the present invention may be carried out in the process of forming into a wooden material, and produced as a wooden material. The processed product may be subjected to post-treatment (therefore, in the present invention, the term "wood material" is used to include an intermediate material in the molding process).

[0035]

EXAMPLES The present invention will be described below with reference to examples. [Example 1] As a wood material, water content 20%, thickness 30m
A cedar material having m, width of 150 mm and length of 600 mm was prepared.
A silicon rubber sheet S having a thickness of 0.4 mm was laid on a lower heating plate 1a of a pressing device having a heating plate having a mirror surface on the surface of the configuration described with reference to FIG.
Further, an elastic silicon material having a height of 32 mm and a width of 30 mm is used as a sealing member 2 on four circumferences of the cedar material W, and a stainless material having a height of 12 mm and a width of 50 mm is further provided on four circumferences of the sealing member 2 as a thickness regulating jig. No. 3, and the whole of the cedar material, the sealing member, and the thickness regulating jig were covered with a silicon rubber sheet S ′ having a thickness of 0.4 mm.

After setting the heating plates 1a and 1b to 200 ° C.,
The hot platen is moved at a pressure of 50 kgf / cm ² and brought into contact with the cedar wood through the silicone rubber sheets S and S ′, and the first for several minutes.
After the subsequent heating, the pressing device was operated to bring the heating plate 1b closer until the movement was restricted by the thickness control jig 3, and the wood material W was gradually consolidated. As a result, the compression ratio of cedar wood became about 60%. In that state, heating was continued for 5 minutes and 10 minutes, and then cooling water was supplied to the heating plates 1a and 1b to decompress for 5 minutes, and the consolidated wood material was taken out from between the heating plates.

Example 2 The cedar material and the silicone rubber sheet used in Example 1 were used for consolidation. However, here, a press having a hot platen capable of applying high frequency was used. After arranging the respective members in the same manner as in Example 1, the heating platen was set to 180 ° C., and the heating platen was moved at a pressure of 50 kgf / cm ² so that the silicone rubber sheet covered above was moved in the same manner as in Example 1. It was made to contact with the cedar wood through. After the primary heating for a few minutes, the pressing device is operated to bring the hot platen closer until the movement is restricted by the thickness control jig to compress the wood material, and in that state, 13.56 MHz, output 200V 8kw After irradiating with high frequency for 2 minutes and 4 minutes, cooling water was supplied to the hot platen and decompressed after 5 minutes, and the consolidated wood material was taken out from between the hot plates.

Example 3 The same process as in Example 2 was performed. However, the cedar material was placed directly on the lower heating plate without laying a sheet-like member. Further, the whole of the cedar material, the sealing member and the thickness regulating jig was covered with a PET sheet having a thickness of 0.2 mm and embossed on the surface from above, and then compression and heating were performed.

[Comparative Example] The same cedar material as in Example 1 was used, and consolidation was performed under the same conditions as in Example 1 except that the sheet-shaped member was not used. Each of the final products obtained in each of the Examples and Comparative Examples was boiled in a boiling tank for 2 hours and then absolutely dried, and the thickness of each was measured, and the thickness recovery rate in the radial direction was calculated by the following formula. Was measured at. The results and surface properties are shown in Table 1. Recovery rate = (thickness after boiling for 2 hours and absolute drying-thickness after consolidation) /
(Thickness before consolidation-thickness after consolidation) x 100%

[0040]

[Table 1]

[Discussion] As is apparent from Table 1, according to the heat treatment method for a wooden material according to the present invention, the wooden material is sandwiched between the mirror-finished heating plates to be consolidated,
Fine irregularities were formed on the surface, and a product with high reality as a wood material and rich in design was obtained.
The recovery rate is greatly improved because the sealing property is improved by using the sheet-shaped member.

Further, in particular, in the case of Example 1 and Example 2, the amount of deformation of the silicone packing, which is the elastic sealing material, is small as compared with the case of Example 3 and Comparative Example, and the processing is uniform even in the inside. And it was perfect. This is probably because the silicone rubber sheet used as the sheet-shaped member further improved the sealing performance. Further, in the case of Example 3, it was particularly easy to separate from the hot platen due to the influence of the PET sheet arranged on the surface, and the workability was good.

[0043]

EFFECTS OF THE INVENTION By using the heat treatment method of the present invention, it is possible to easily obtain a consolidated wood material which is not only fully consolidated to the central portion but also has a high surface design.
In addition, the packing used during processing does not move or be damaged, and stable processing can be continued for a long time.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a heat treatment method for wood materials according to the present invention.

FIG. 2 is a diagram for explaining another heat treatment method for wood materials according to the present invention.

FIG. 3 is a view for explaining still another heat treatment method for wood materials according to the present invention.

FIG. 4 is a view showing an endless belt-shaped heating plate used in the heat treatment method of FIG.

[Explanation of symbols]

W ... Wood material, 1a, 1b ... Hot platen, S, S '... Sheet-like member, 2 ... Elastic sealing material, 3 ... Thickness control jig

Claims (5)

[Claims] 1. A method for heat-treating a wood material by sandwiching the wood material between hot plates in a sealed state, wherein a sheet-like member is provided between one or both surfaces of the wood material to be treated and the hot plate. A heat treatment method for a wood material, characterized in that the wood material is arranged and then compressed and heated by a hot platen to consolidate the wood material. 2. A method for heat-treating a wood material by sandwiching the wood material between heating plates in a sealed state, wherein a sheet-like member is provided between one or both surfaces of the wood material to be treated and the heating plate. And a sealing material and a required thickness control jig are arranged around the wood material to be treated, and in that state, the wood material is compressed and heated by the hot plate to be consolidated. Heat treatment method for wood. 3. A method for heat-treating a wood material by sandwiching the wood material between heating plates in a sealed state, wherein a sheet-like member is provided between one or both surfaces of the wood material to be treated and the heating plate. And a frame capable of compressing the peripheral edge of the wooden material is disposed on the peripheral edge of the wooden material, and further, a required thickness regulating jig is disposed around the wooden material, and the hot platen is placed in that state. A method for heat treating a wood material, characterized in that the wood material is compressed and heated to be consolidated. 4. The method for heat treating a wood material according to claim 1, wherein the hot platen has an endless belt shape. 5. The heat treatment method for a wood material according to claim 1, wherein the sheet-shaped member is a silicon rubber sheet.