JP3148501B2 - Wood material heat treatment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heat-treating a wooden material, and more particularly to a method for improving the dimensional stability of a wooden material or the dimensional fixability of a compacted wooden material, which is effectively used for construction or furniture. The present invention relates to a method for heat-treating a wood material to obtain a compacted wood material.

[0002]

2. Description of the Related Art In recent years, softwood, medium-density fiberboard (MDF), particle board, and the like have been attracting attention as alternative materials to hardwood, because high-quality hardwood has decreased and sufficient supply has not been obtained. However, softwoods are generally softer than hardwoods, and when used as architectural or furniture materials, surface properties such as surface hardness and abrasion resistance, durability against moisture and heat, and strength are important. There was a problem. Swelling in the thickness direction with respect to moisture was a major problem for MDF and particle board.

[0003] For this reason, if the conifer is boiled or softened by steam treatment, the conifer is condensed to a thickness of about 20 to 70% of the initial thickness by hot pressing with a flat plate press. Is known. The consolidation of softwood has remarkable effects on the surface properties, durability and strength as described above, but the action of one or both of moisture and heat tends to return the consolidated softwood to its original state. There was a drawback that the coniferous wood, which had been subjected to the force and improved in performance due to its compaction, was restored to the original state.

[0004] There has been proposed a method of preventing the restoration of the densified wood material by placing the densified wood material in an autoclave and treating it with high-pressure steam at 160 ° C to 220 ° C for several minutes. In addition to being complex and expensive as a device due to its structure, this method also requires the use of high pressure steam inside the wood (especially in the middle of the wood).
It is difficult to penetrate the wood material, the treatment effect is not uniform, and the treatment state of the central part and the peripheral part of the wood material often differs.

[0005] In addition, wood materials are compressed in an autoclave. In this case, it is necessary to install a press in the autoclave or to penetrate a cylinder through the wall of the autoclave. It gets complicated. The present applicant has conducted intensive research to solve the inconvenience of the conventional method for treating wood material, and not only can prevent the compacted wood material from being restored to its original thickness due to moisture and heat, but also the entire wood material. A new method of treating wood materials that can uniformly and efficiently treat wood materials over a long period of time has been devised and filed (Japanese Patent Application No. 5-2895).
No. 6: JP-A-6-238616, Japanese Patent Application No. 5-28
957 : JP-A-6-238615 ).

[0006] This processing method uses a hot press having a hot plate used in conventional wood processing without processing wood material in an autoclave. After placing the wood material to be placed, and further surrounding it with an elastic sealing material such as an elastic silicon material and a thickness regulating jig such as a stainless steel material, the wooden material is compressed as necessary, and To heat the wood,
If necessary, high-pressure steam is supplied from the hot plate,
It is a method of consolidating wood by vaporizing the water contained in the wood itself (and using the supplied high-pressure steam). It has a normal hot plate used for pressing wood and manufacturing composite materials. Since it can be performed using a hot press, there is an advantage that the processing itself is simplified.

[0007] The above-mentioned method for heat treating wood is effective in itself, but every time the wood to be treated is placed on the hot platen of the hot press, an elastic sealing material and thickness regulation are placed around the plate. Since it is necessary to dispose the jigs and remove them after the consolidation process, a complicated operation may be required in the case of consolidating a large number of wooden materials having relatively small dimensions. In addition, when the processing temperature is high, the generated internal vapor pressure increases, and the elastic sealing material and the thickness regulating jig may move or deform under the influence of the pressure, and the generated water vapor is kept airtight. There may be cases where it is not done. In addition, the surface of the wood material to be treated depends on the surface condition of the hot plate, etc. And it is difficult to obtain one with more or different surface characteristics.

The present inventor has further continued his research, and as an improved treatment method of the above-mentioned heat treatment method for wood material, the work before and after the consolidation treatment by a hot press is extremely simple. Yes, it is possible to carry out a stable compaction treatment regardless of the treatment temperature, and to obtain a compacted wood material with surface characteristics that do not depend on the surface condition such as the hot plate of a hot press. A heat treatment method has been developed and proposed (Japanese Patent Application No. 5-194870).
No . : JP-A-7-47511 ).

In this method, as shown in FIG. 6, a thickness h (h>h>) is provided inside a rigid container body 1 having a space having a depth H inside.
H) The wooden material 4 is accommodated, and the plate-shaped lid 2 placed on the wooden material 4 is placed between the upper and lower hot plates 5 and 5 of the hot press. The heating plate 5 is moved while heating the wooden material 4 (with the use of high frequency heating if necessary) to bring the lid 2 and the rigid container main body 1 into close contact with each other. A sealing material 3 such as a heat-resistant silicon material is provided around the rigid container main body 1, and the inside of the rigid container main body 1 is in a sealed state, and a compressed wooden material 4 is sealed therein. By continuing heating in this state, the vaporization of the moisture inside the wood material continues to proceed, and the wood material is compacted.

By using this heat treatment method, it is possible to obtain a wood material sufficiently compacted to the center in a short time with a simple operation, and there is no movement or damage of a packing or the like used at the time of heat treatment. It has become possible to perform stable processing continuously for a long period of time. In addition, it has become possible to obtain a compacted wood material that is not affected by the surface characteristics of the hot platen.

[0011]

SUMMARY OF THE INVENTION The present inventors have found that there is still a matter to be improved in the above-described heat treatment method using a rigid container in the process of continuing the experiment on the compaction treatment of wood material. did. That is, the use of the rigid container eliminates the need for an elastic silicon material as a sealing material to be disposed on the hot platen, and eliminates the inconvenience associated with the movement and damage of the packing used during the heat treatment. Before moving to the upper edge and sealing the internal space, the steam generated from the wood material 4 leaks to the outside, and the consolidation process may be insufficient. Was. In particular, when the wood material is thick or has a low water content (about 5% or less), the influence of the steam leakage is large.

This means that the sealing material 3 such as an elastic silicon material provided on the upper edge portion of the rigid container body 1 is made tall, and the sealing material 3 having a height up to or higher than the upper surface of the wood material 4 to be treated is used. By using an elastic silicon material as the sealing material 30, it is severely damaged as described above and cannot be used many times. In addition to the necessity, when the elastic silicon material is compressed to about ２〜 to 裂, the elastic silicon material may be torn, and the sealing function may be lost. At the temperature and pressure required for consolidating wood materials, other sealing materials such as fluororubber also cause similar disadvantages.

[0013] This is a processing method without using a rigid container, that is, heat treatment of a wooden material by disposing a thickness regulating jig such as an aluminum frame and a sealing material such as an elastic silicon material on a hot platen. Even in the case, it occurs similarly.

[0014] By supplying high-pressure steam to the wood material from outside via a hot plate or the like, it is possible to substantially compensate for the amount of steam generated from the wood material until the sealing is achieved. Installing a system for supplying high-pressure steam from the outside to the pressure press and its hot plate not only requires a lot of cost, but also requires an external supply if the supply of high-pressure steam is continued during the heat treatment. Loss due to leakage of high-pressure steam supplied from the furnace is inevitable.
By providing a means for interrupting the supply of high-pressure steam and operating it in connection with the movement of the hot plate, it is possible to supply external steam only after sealing, but such a system is constructed. That also requires a lot of expense. Also, in any case, it is difficult to construct a sealed environment from the beginning, and it is practically impossible to create a consolidated material with a curved surface or a compacted material with large uneven patterns. It was impossible.

An object of the present invention is to further improve the method of heat treatment of wooden materials, which has already been proposed by the present inventors, to condense the wooden materials by converting the water content of the wooden materials into steam. Specifically, it is possible to provide a heat treatment method for wood materials in which water vapor generated from wood materials in the process of heat treatment can be used for consolidation without leaking to the outside, thereby further improving treatment efficiency. It is intended to be. Another object of the present invention is to provide a method for heat treating a wooden material capable of producing a consolidated material having a curved surface or a large uneven pattern.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and achieve the object, the present invention basically comprises a solid material or a solid material.
Heat-presses wood fibers, wood chips or wood chips.
Such as molded MDF or particle board
A heat treatment method for wood material, which is a wood processing material, using a piston-shaped member and a cylinder-shaped member that are arranged between the pressing plates of the pressing device and that can slide and move with each other in an airtight state,
Uncompressed wood material to be the processing placed on either the piston-like member and the cylindrical member, the sealed space is formed by moving one or both of the piston-like member and the cylindrical member And a step of further moving one or both of the piston-like member and the cylinder-like member to clamp the wood material in a non-compressed state or a compressed state by the piston-like member and the cylinder-like member; Material and piston
Heating means formed on one or both of the
Ri discloses a heat treatment method of the wood material, characterized in that a step of performing heat treatment.

In the method of the present invention, a heating method for performing a heat treatment on the wooden material is optional, but a heating means such as an electric heater steam pipe is attached to one or both of the piston-like member and the cylindrical member. It may be performed by heating from the heating means, may be performed by heating from the hot plate using a hot press having a hot plate heated by an electric heater or a steam pipe as a pressing device,
Further, high-frequency heating means may be provided at a portion where the heat treatment is performed, and so-called high-frequency heating may be performed. Moreover, you may perform combining these heating means suitably.

In the heating process, high-pressure steam may be supplied to the inside of the sealed space from the outside from one or both of the piston-like member and the cylinder-like member. An agent for chemical treatment and / or plasticization of the material may be supplied alone or with high pressure steam.

Further, in carrying out the method of the present invention, a pair of press plates are arranged in a sealed space formed by the piston-like member and the cylindrical member, and the wood material to be processed is disposed between the pair of press plates. The heat treatment and the consolidation treatment of the wooden material may be performed in a state where is placed. Even in this case, since the necessary processing is performed after the wood material is placed in the sealed space, even if the pair of press plates have a curved surface such as a curved surface, the pair of press plates It is possible to reliably obtain a consolidated wood material having a shape corresponding to the surface shape of the 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 object can be achieved equally.

[0020]

[Operation] According to the method for heat treating wood material according to the present invention,
A piston-like member and a cylinder-like member that can slide and move with each other in an airtight state are attached to opposing pressing plates of the pressing device, and in a state where the cylinder-like member and the piston-like member are separated from each other, The wood material to be treated is placed on one of them. Next, the pressing plate is moved to bring the cylindrical member and the piston member closer to each other. Thereby, the wood material to be treated is sealed in the formed processing space in a sealed state in a state where the wood material to be treated is in contact with one surface of the cylindrical member or the piston-shaped member on which it is disposed but not in contact with the other. Is done.

In this state, the wooden material is subjected to a heat treatment. As described above, the heating is performed by a heating means such as an electric heater or a steam pipe attached to the cylindrical member or the piston-shaped member as described above, and when using a hot platen press heated by an electric heater or a steam pipe as a pressing device. It is performed by the heating plate or other heating means such as high-frequency heating, or by a combination thereof. In the process, one or both of the cylindrical member and the piston-like member are further moved, and the surfaces of both the cylindrical member and the piston-like member are placed on the front and back surfaces of the wooden material in an uncompressed state or a compressed state. Close to. This heating converts the water contained in the wood into steam. However, since the space in which the wood is contained is already a sealed space, the generated steam is discharged outside (ie, the cylindrical member and the piston). (A place other than the space formed by the shape member). Thereby, the densification of the wooden material proceeds.

If necessary, in the course of the heat treatment,
External high-pressure steam can be supplied from the surface of the cylindrical member and the piston-like member, or from either surface. When processing wood material such as a particle board having a low internal moisture, a sawn board or a veneer which has been dried once, the consolidation process effectively proceeds by the high-pressure steam supplied from the outside. Acetylation of wood,
An agent for chemical treatment such as formalization or an agent for plasticization such as ammonia gas or low molecular weight phenol may be supplied alone or together with high-pressure steam.

After the heating and the compression for a predetermined time and the supply of the external high-pressure steam and / or the chemical as required, the operation thereof is stopped, and the pressing plate is moved between the cylindrical member and the piston member. To open the sealed space. The process ends by removing the processed wood material from the open space. After the heat treatment and the supply of external high-pressure steam and / or chemicals performed as necessary, cooling water is supplied to the hot platen or the cylindrical member and the piston-like member to circulate the treated wood material. Active cooling may be performed, and then the pressure release, that is, the cylinder-shaped member and the piston-shaped member may be moved in a direction in which they are separated from each other. Is further improved.

In the practice of the present invention, a pair of press plates having curved surfaces facing each other are arranged in a space formed by a cylindrical member and a piston-like member, and the wood to be treated is disposed between the press plates. The above-described processing can be performed in a state where the materials are arranged. In this case, the wood material can be processed without being affected by the surface characteristics of the cylindrical member and the piston-like member, and various types of wood materials such as a compacted wood material having an uneven surface and a compacted wood material having a large curved surface can be used. A processed wood material having a shape can be obtained.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for heat-treating wood according to the present invention will be described in more detail based on embodiments with reference to the accompanying drawings. FIG. 1 shows a cylindrical member 1 used for the heat treatment of the present invention.
0 and an example of a piston-like member 20 that slides and moves on the cylinder member. The cylindrical member 10 has a box shape in this embodiment, and forms an upper open space S having a depth D for accommodating the wood material W to be treated therein, and has an upper edge surface 11 and a bottom surface 11. 12 is a flat surface. A bulging portion 14 having a through hole 13 is integrally formed on the bottom surface side of the side wall portion of the cylindrical member 10. Further, an electric heater 16 (see FIG. 2) is embedded in the bottom surface and four side surfaces of the cylindrical member 10.

The piston-like member 20 which can slide on the cylinder-like member 10 in an airtight manner has a plane shape slightly smaller than the plane-size of the upper open space S of the cylinder member 10 and has an upper side. It has a pressing portion 21 having a height d substantially equal to the depth D of the open space S, and a flat upper surface portion 22 integrated with the pressing portion 21, and the upper surface portion 22 has a flange 23 formed therearound. . And the flange portion 23
Is formed with a U-shaped notch 24. Further, a groove 25 is formed in the vicinity of the lower end of the press-in portion 21 over the entire periphery thereof, and an elastic packing 30 such as an O-ring made of an elastic silicon material is inserted into the groove (see also FIG. 2). .
In addition, an electric heater 36 is embedded in a tip end surface of the piston-shaped member in contact with the wooden material.

The cylindrical member 10 and the piston-like member 2
The material 0 is preferably stainless steel as a raw material, but is not limited thereto. Any material having resistance to temperature and pressure during heat treatment may be used. For example, an iron material, an aluminum material, or the like can be used. In addition, the surfaces of the cylindrical member 10 and the piston-like member 20 that come into contact with the woody material W to be treated may be all or partially mirror-finished, or may be subjected to a required uneven processing. In the former case, it is possible to obtain a densified wooden material having a flat and glossy surface, and in the latter case, it is possible to obtain a densified wooden material having an embossed surface.

The cross-sectional shape of the space S formed inside the cylindrical member 10 is rectangular in the drawing, but is not limited to this, and may be any shape as long as it can accommodate the wood material W to be processed. is there. However, the depth D is set to be greater than the thickness h of the wooden material W to be processed before the processing (that is, D> h). 40 is a thickness regulating jig,
As will be described later, if necessary, the cylindrical member 10 is disposed on the upper edge surface 11 during the heat treatment.
The final approach distance between the piston and the piston-like member 20 is regulated. The thickness regulating jig 40 is made of a highly rigid material such as stainless steel.

Next, a procedure for heat-treating the wooden material W will be described with reference to FIG. First, as shown in FIG.
The cylindrical member 10 and the piston-like member 20 are attached to the pressing platen 51 below and the pressing platen 52 above the pressing device. How to attach is arbitrary, but in the cylindrical member 10 and the piston member 20 shown in the above-described embodiment,
The lower pressing plate 51 has a position corresponding to the through hole 13 formed in the bulging portion 14 of the side wall of the cylindrical member 10, and the upper pressing plate 52 has a notch 24 formed in the flange 23 of the piston 20. The screw holes are formed at the positions corresponding to, respectively, and fixed with the screws 15 and 27 (see also FIG. 1). If a suitable positioning means is provided on the lower pressing platen 51 and the cylindrical member 10 can be positioned by the positioning means, the cylindrical member 10 may be simply placed on the pressing plate 51 without any problem.

The wooden material W to be treated is moved into the open space S of the cylindrical member 10 in a state where the pressing members 51 and 52 are moved away from each other, and the cylindrical member 10 and the piston member 20 are separated from each other. Deploy. As described above, the thickness h of the wood material W to be treated is smaller than the depth D of the open space S. Next, the thickness regulating jig 40 is placed on the upper surface 11 of the cylindrical member 10. This thickness control jig 4
The height of 0 is the thickness h 'of the wooden material W to be treated as described later, after the heat treatment.

Next, one or both of the pressing plates 51 and 52 are moved, and as shown in FIG.
The elastic packing 30 attached to the press-in portion 21 of the piston-like member 20 is inserted into the upper end area of the internal space S of No. 0. Thereby, a space S ′ sealed by the cylindrical member 10 and the piston-like member 20 is formed. At that time, the piston-like member 20 is
And the wood material W is placed in an uncompressed state.

Preferably, heating of the wooden material is started in this state. In this embodiment, the heating is performed by the electric heater 1.
This is performed by energizing 6, 26. The heating temperature needs to be higher than the temperature at which the water contained in the wooden material W evaporates. Next, the pressing plates 51, 5
Heating is continued while one or both of the two are moved, and the tip end surface of the piston-like member 20 is in contact with the surface of the wooden material W as shown in FIG. The wood material W tends to expand together with the water vaporization of the internal moisture due to the heating, but since the expansion is regulated by the tip end surface of the piston-like member 20,
The consolidation of the wood material W proceeds. Depending on the type of the wood material W, the required consolidation can be achieved by continuing this state. In this case, the thickness of the thickness regulating jig 40 is equal to the initial thickness h of the wooden material W to be processed.

In the course of the treatment, the heating temperature may be changed stepwise. For example, the temperature may be initially set at about 200 ° C. and gradually lowered with time, or by heating at a lower temperature after a predetermined time has elapsed. Discoloration due to heat on the surface of the wood material W can be prevented as much as possible. In the present invention, since the wooden material W is already placed in the sealed space at the time of the initial heating, the water vapor generated from the inside of the wooden material W does not leak out of the sealed space. Acts on heat treatment.

Depending on the tree species, the piston-like member 2
0 is further lowered to keep the wooden material W in a compressed state (up to a thickness h ′ as a final product) and heating is continued. In this case, the thickness of the thickness regulating jig 40 is equal to the thickness h 'after the compression of the wood material W to be processed. When it is necessary to improve the surface condition together with compression by applying compression treatment like softwood, it is preferable to prepare a material thicker than the thickness of the final product, but it requires special compression like particle board. If the material is not used, a thickness regulating jig 40 having the same thickness is used.

After the completion of the predetermined heat treatment, the pressure is released. Decompression may be performed gradually over a certain period of time.Although not particularly shown, a cooling water circulation line is formed in a hot platen, a cylindrical member, and a piston member to supply the cooling water. It may be performed by decompression in a cold state. According to experiments, when decompression is performed in a cold state, the dimensional change rate of the obtained final product is smaller than in other decompression, and the surface state can be finished beautifully.

FIG. 4 shows another embodiment of the present invention.
In this example, the cylindrical member 10a and the piston member 20a have conduits 57, 58 having a number of open ends 55, 56 toward the sealed space to be formed.
The other ends of the conduits 57 and 58 can be connected to an external high-pressure steam supply source (not shown) and / or a chemical supply source (not shown).

When heat treatment is performed on the wooden material using the cylindrical member 10a and the piston member 20a, in addition to the same processing as described with reference to FIG. Through 58, an additional supply of high-pressure steam and / or medicament can be provided in the enclosed space. By supplying high-pressure steam from the outside, good consolidation can be achieved even for wood materials such as particle boards and dried veneers with low moisture content, and acetylation and formalization of wood materials. It is possible to supply a chemical agent for the purpose of chemical treatment or a plasticizing agent such as ammonia gas or low-molecular-weight phenol, alone or together with high-pressure steam, and various processing modes can be adopted.

FIG. 5 shows another embodiment of the present invention.
In this example, a pair of press plates 61 and 62 formed of the same material are arranged in a space formed by the cylindrical member 10 and the piston member 20, and the processing is performed between the pair of press plates. The wood material is processed with the wood material W to be placed thereon. In this case, the cylindrical member 1
There is an advantage that a densified wooden material having a shape and properties different from those of the surface in contact with the wooden material of the piston-like member 20 can be obtained. For example, opposing surfaces of a pair of press boards 61 and 62,
That is, by making the surface in contact with the wooden material W a concave surface and a convex surface having the same curvature, a consolidated wooden material curved as a whole can be obtained. Although not shown, the curvatures of both surfaces may be different from each other, and may be a shape such as a wavy shape, an embossed shape, or the like.

In this embodiment, since a part of the space formed by the cylindrical member 10 and the piston member 20 is occupied by the pair of press plates 61 and 62, the piston member By setting the length of the push-in portion 20 to be shorter than the depth D of the opening space S of the cylindrical member 10 as shown in the drawing, the entire height can be saved, which is a preferable embodiment. Further, also in this embodiment, the pipes 57, 5 and
8 can be used, and similar additional processing may be performed. At this time, a large number of through holes may be formed in the pair of press plates for the purpose of enhancing the processing effect, and the supplied steam or chemical may be supplied to the surface of the wood material from the surface of the press plate.

Further, when it is desired that only one surface side of the wood material has a surface characteristic different from that of the cylindrical member 10 and the piston-like member 20, only one of the pair of press plates is used. It will be appreciated that the heat treatment can be performed in the processing space. In the above description, the thickness regulating jig 40 is arranged between the cylindrical member 10 and the piston-like member 20 in order to regulate the thickness of the compacted wood material after the treatment. The jig 40 is not indispensable, and any means can be used in place of the thickness regulating jig as long as it can control the distance between the hot plates of the hot press at a constant level. For example, a mechanism that measures the distance between the pressing plates used in a conventionally known pressing device and controls the movement of the pressing plate based on the measured value may be used.

Although not shown, when a hot press having a hot platen is used, heat is applied instead of or in addition to heating by the electric heaters 16 and 26 attached to the cylindrical member 10 and the piston member 20. Heat treatment using a plate may be performed, and high-frequency heating may be additionally used. In particular, when high-frequency heating is used in combination, moisture is uniformly vaporized from the inside of the wood material W, so that the processing cycle in which a more uniform heat treatment is performed can be further shortened. Next, an actual example in which the wood material is heat-treated by the above method will be described.

[Practical Example 1] A hot press using a cylindrical member and a piston member capable of supplying high-pressure steam as shown in FIG. Was mounted between the hot plates.
The wood to be treated is white oak (thickness 15
mm × width 50 mm × length 50 mm).

The white oak material was placed in the internal space of the cylindrical member with the cylindrical member and the piston member separated from each other. Next, a thickness regulating jig having a thickness of 15 mm was placed on the cylindrical member, and the heating plate was heated to about 180 ° C. by heating the electric heater attached to the cylindrical member and the piston member without heating. Then, the cylindrical member and the piston-like member were brought close to each other until regulated by the thickness regulating jig. In this state, water vapor (180 ° C., 10 kgf / cm ² ) was externally supplied into the sealed space for 8 minutes through a pipe provided in the cylindrical member and the piston member. Next, cooling water was circulated through the cooling water circulation passage of the cylindrical member and the piston-shaped member for 8 minutes, and then the hot plate was separated to release pressure.

[Comparative Example 1] A white oak material of the same size was placed in an autoclave maintained at 180 ° C, and supported in a state where displacement in the thickness direction was regulated by a jig. / Cm ² ) for 8 minutes. Thereafter, it was gradually opened for 5 minutes.

[Practical example 2] Practical example 1 except that a large number of embossments like irregularities were applied to the surface in contact with the wood material to be treated.
The same cylindrical member and piston-like member as those described above were used.
In addition, cedar wood (thickness 3 mm x width 100 mm)
× length 100 mm). After the cylindrical member and the piston member are separated from each other and the cedar material is placed in the internal space of the cylindrical member, a 1 mm-thick regulating jig is placed on the cylindrical member, and the heating plate is heated without heating the cylinder. The cylindrical member and the piston-like member were brought close to each other until they contacted with the cedar material in a state where the electric heater was attached to the member and the piston-like member and heated to about 180 ° C. In this state, water vapor (180) is externally introduced into the sealed space through a pipe provided in the cylindrical member and the piston member.
(° C, 10 kgf / cm ² ) was started. While supplying steam, the piston-shaped member was further lowered until it was regulated by the thickness regulating jig. After supplying steam for a total of 8 minutes, cooling water was circulated through the cooling water circulation passages of the cylindrical member and the piston member for 8 minutes, and then the hot plate was separated to release pressure.

Comparative Example 2 The same cedar wood as used in Example 2 was irradiated with microwaves for 1 minute in a microwave irradiation vessel, and then compressed to 1 mm with an ordinary pressing machine. After fixing it with a jig in a state where the displacement in the thickness direction is regulated, it is put into an autoclave, and steam (180 ° C., 10 kgf / c
m ² ) and then gradually opened over 5 minutes.

Each of the test pieces prepared in Examples 1 and 2 and Comparative Examples 1 and 2 was boiled in a boiling tank for 2 hours and then dried to dryness. The thickness of each piece was measured. The recovery was measured. Table 1 shows the results. Thickness swelling ratio = (thickness after boiling-absolute dry thickness before boiling) /
(Absolute dry thickness before boiling) x 100% Recovery rate = (absolute dry thickness after boiling-thickness after consolidation) / (thickness before consolidation-thickness after consolidation) x 100%

[0048]

[Table 1]

[Discussion] As can be seen from the results in Table 1,
There is almost no difference in the effect of the heat treatment between those treated according to the present invention and those treated in an autoclave, and according to the method according to the present invention, even if a complicated processing operation is not performed using the autoclave, a simple treatment can be performed. It can be seen that the operation produces a compacted wood material equivalent to that of the autoclave.

[0050]

According to the method of the present invention, it is possible to consolidate the wood material and stabilize the dimensions many times by using a normal pressing device, and it is easy to operate and at a low cost. Processing becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating one embodiment of each member used in a heat treatment method according to the present invention.

FIG. 2 is a partially enlarged view showing a state of heat treatment of a wooden material.

FIG. 3 is a diagram illustrating a process of heat treatment of a wooden material.

FIG. 4 is a schematic cross-sectional view illustrating another embodiment of each member used in the heat treatment method according to the present invention.

FIG. 5 is a schematic sectional view illustrating still another embodiment of each member used in the heat treatment method according to the present invention.

FIG. 6 is a diagram illustrating a method for heat-treating a wooden material according to the earlier application.

[Explanation of symbols]

10: cylindrical member, 20: piston member, 30
... Packing, 40 ... Thickness regulating jig, 16, 26 ... Electric heater, 51,52 ... Pressing plate of pressing device, W ... Wood material to be treated

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-180802 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B27K 1/00-5/00

Claims (8)

(57) [Claims] 1. Solid wood or wood fiber, wood chips or
Is an MDF or plastic made by hot-pressing wood chips.
-The heat of wood, which is a wood processing material such as
A processing method, comprising using a piston-like member and a cylinder-like member that are arranged between the compression plates of the compression device and that can slide and move with each other in an airtight state, and using any of the piston-like member and the cylinder-like member. the wood material to be a process arranged,
A step of housing one or both of the piston-shaped member and the cylindrical member in a sealed space formed by moving the piston-shaped member and the cylinder-shaped member in an uncompressed state; and further moving one or both of the piston-shaped member and the cylindrical member. Holding the wood material in an uncompressed state or a compressed state by a piston-like member and a cylinder-like member, and one or both of a piston-like member and a cylindrical member with respect to the wood-like material.
Performing a heat treatment by a heating means formed on the wooden material. 2. The method according to claim 1, wherein the heating means is an electric heater disposed on one or both of the piston-like member and the cylinder-like member. 3. The heat treatment method for wood material according to claim 1, wherein the pressing device has a hot plate, and the heat treatment of the wood material is performed by the hot plate of the pressing device. 4. The method according to claim 1, wherein the heat treatment is performed by high-frequency heating. 5. The method according to claim 1, wherein at least one of the piston-like member and the cylinder-like member is used for heat treatment of the wooden material.
The method of claim 1, further comprising supplying high-pressure steam to the inside of the sealed space. 6. At the time of the heat treatment of the wooden material, from one or both of the piston-like member and the cylinder-like member,
The method for heat treating wood material according to claim 1, wherein an agent for chemical treatment and / or plasticization of wood material is supplied into the sealed space. 7. At the time of the heat treatment of the wooden material, from one or both of the piston-like member and the cylinder-like member,
2. The heat treatment method for wood material according to claim 1, wherein high-pressure steam and an agent for chemical treatment and / or plasticization of wood material are supplied into the sealed space. 8. A wooden structure in which a pair of press plates are arranged in a space formed by the piston-like member and the cylindrical member, and a wood material to be processed is placed between the pair of press plates. 2. A method for heat treating wood material according to claim 1, wherein the wood material is treated.