JPH054203A - Method and apparatus for heat-treating wooden material - Google Patents

Abstract

PURPOSE:To enhance the modifying effect of a wooden material, to reduce the curing inferior part of a resin solution, to prevent the deformation of the wooden material and to smoothly and continuously perform a solvent volatilizing process and an injection solution curing process. CONSTITUTION:A wooden material (a) in which an injection solution such as a synthetic resin solution is injected is held between heating plates 14 from the surface and rear thereof within a hermetically closed container 1. Heating medium flow passages 15 permitting a heating medium to pass are provided in the heating plates 14 and a heating medium tank 7 is connected to the heating medium flow passages 15 through a heating medium head 6, a heating medium supply passage 9 and a circulating pump 8 and hot water or steam having temp. capable of volatilizing the medium or the injection solution is supplied to the heating medium supply passages 15 from the heating medium tank 7. A vacuum pump 17 is connected to the hermetically closed container 1 through a suction pipe 18 and a heat exchanger 19 and the hermetically closed container 1 becomes a reduced pressure state by the operation of the vacuum pump 17.

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 woody materials and an apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, after injecting an injecting liquid such as a synthetic resin liquid or various chemicals into a wood material, and heating the wood material to cure the injecting liquid in the wood material, dimensional stability and weather resistance are improved. Methods for producing modified wood having improved properties and the like have been performed.

To obtain such a modified wood, the method of heating and hardening the injection liquid injected into the wood material is to directly heat the wood material with a hot air dryer, hot press, etc. A method of heating by a dielectric heating means such as microwave or microwave is known.

[0004]

However, when the wood material into which the injection liquid is injected is subjected to heat treatment by a heating means such as a hot air dryer or a hot press, the wood material is cracked or warped during heating, curing or drying. , Bending, twisting, dropping, etc., and when the solvent volatilizes, the injection liquid flows out and the residual ratio of the injection liquid becomes small, the reforming effect decreases and the curing failure part of the injection liquid occurs. There is a problem. In particular, the above tendency is remarkable when a heat treatment is applied to a thick wood material.

The reason why cracks and the like occur during curing and drying as described above is that the solvent content gradient between the central portion and the surface layer portion of the woody material is caused by the abrupt movement of the solvent in the woody material during heating. This is because the difference becomes large in contraction stress between the central portion and the surface layer portion, or irregular contraction occurs. Further, the synthetic resin liquid on the surface of the wood material is hardened before the synthetic resin liquid on the center part, and the release of the residual solvent to the outside of the wood material is prevented. As a result, the vapor pressure in the center part causes an explosion. It is also because of the reason.

On the other hand, when the wood material is heated by the dielectric heating means such as the above-mentioned high frequency wave or microwave, the wood material is dielectrically heated from the inside, so that the injection liquid is also hardened from the inside, so that the above problem is solved. . However, since only the dielectric heating means tends to have a high temperature in the vicinity of the + electrode plate and a low temperature in the vicinity of the − electrode plate, temperature unevenness occurs due to the arrangement of the electrode plates. For this reason, there arises a problem that the concentration of the solvent, which is a component of the incompletely cured solution or the injection liquid, becomes high.

Therefore, it is considered that an external heating means such as a heating plate provided with a heating wire is also used. However, the heating wire and the heating wire of the heating plate itself generate heat due to the influence of high frequency, so that the heating plate may be damaged. In addition, there is a possibility that the influence of the high frequency may reach other devices via the heating wire.

Further, when an injecting liquid containing a flammable solvent is injected into a thick wood material, the heating temperature for heating and curing the wood material is higher than usual because the wood material is thick. The flammable solvent may cause fire or explosion.

Further, the above problems are not limited to the case where the wood material is heated to cure the injection liquid in the wood material, and the wood material is dried by heating the wood material to evaporate the moisture therein. It also occurs when you do.

An object of the present invention is to solve the above problems and to modify or dry the wood material without deforming the wood material.

[0011]

In order to solve the above-mentioned problems, the invention according to claim 1 efficiently heats a wood material in a depressurized state to volatilize a solvent, and at the same time, to remove the wood material from its front and back surfaces. By heating with the sandwiched heating plate, uneven heating of the wood material is eliminated and deformation of the wood material is prevented.

[0012] Specifically, a solution means taken by the invention of claim 1 is a heating medium flow passage through which a heating medium can flow from a front surface and a back surface of a wood material in which an injection liquid such as a synthetic resin liquid is injected in a closed container. After sandwiching with a heating plate having a, a heating medium for solvent volatilization at a temperature at which the solvent of the injection liquid can be volatilized through the heating medium flow path is circulated in the hermetically sealed container, and the heating medium is passed through the wood material. Volatilize the solvent from the injection liquid, and then pass the injection medium curing heating medium at a temperature higher than the solvent volatilization heating medium and at a temperature at which the injection liquid can be cured through the heating medium flow passage to form the wood. It is configured to cure the injection liquid in the material.

According to the invention of claim 2, in order to vaporize the solvent by dielectrically heating the wood material from the inside thereof, when the solvent is volatilized from the injection liquid in the wood material in the constitution of claim 1, the wood material is vaporized. On the other hand, a structure in which a high frequency is continuously or intermittently oscillated to dielectrically heat the wood material is added.

According to the invention of claim 3, in order to cure the injection liquid by dielectrically heating the wood material from the inside thereof,
Alternatively, in the configuration of 2, when the injection liquid in the wooden material is cured, a configuration in which a high frequency is continuously or intermittently oscillated to the wooden material to dielectrically heat the wooden material is added.

According to a fourth aspect of the present invention, the wood material is dielectrically heated to move the moisture in the central part of the wood material to the surface part, and the wood material is heated by a heating plate under reduced pressure.
The water in the wood material is efficiently evaporated from the wood material.

[0016] Specifically, the means for solving the problems according to the invention of claim 4 is that the wooden material is sandwiched between heating plates having a heating medium flow passage through which the heating medium can flow from the front and back surfaces of the wooden material in a closed container, and then the above-mentioned sealing is performed. The depressurized state of the container is made to flow a heating medium having a temperature capable of volatilizing the moisture in the wood material through the heating medium flow path, and a high frequency is continuously or intermittently oscillated with respect to the wood material to cause the wood material to oscillate. Is configured to be dried. According to the invention of claim 5, when the wood material is heated by the heating plates sandwiched from the front and back surfaces thereof, the heating condition for the wood material can be changed so that the wood material is modified without causing deformation of the wood material. Alternatively, it is dried.

Specifically, a solution means devised by the invention of claim 5 is a plurality of heat treatment apparatuses for a wood material, wherein a plurality of heat medium flow passages through which a heating medium can flow are sandwiched from the front and back surfaces of the wood material. A heating plate, a closed container for housing a plurality of heating plates sandwiching the wood material, a decompressing means for bringing the inside of the closed container into a decompressed state, and the heating medium distribution through a supply pipe provided outside the closed container. The heating medium supplying means is capable of adjusting the heating temperature to selectively supply the heating medium having different temperatures to the passage.

In order to carry out the invention of claim 1 reliably and easily, the invention of claim 6 is a heat treatment device for a wood material, which has a heating medium flow passage through which a heating medium can flow, and a synthetic resin. A plurality of heating plates for sandwiching the wood material into which the injection liquid such as liquid is injected from the front and back surfaces thereof, a closed container for housing the plurality of heating plates for sandwiching the wood material, and depressurizing the inside of the closed container. Decompression means, a heating medium supply means for solvent volatilization that supplies a heating medium for solvent volatilization at a temperature at which the solvent of the injection liquid can be volatilized to the heating medium flow path, and the injection liquid is cured in the heating medium flow path. An injecting liquid curing heating medium supply means for supplying an injecting liquid curing heating medium at a temperature to be obtained, and the solvent volatilizing heating medium or the injecting liquid curing heating medium is selectively supplied to the heating medium flow passage. For evaporating the above solvent It is an arrangement which comprises a and a control means for controlling the heating medium supply means and the injection liquid curing heating medium supply means.

According to a seventh aspect of the present invention, the wood material is dielectrically heated to move the liquid in the central part of the wood material to the surface part, and the wood material is heated by a heating plate under reduced pressure. A method for efficiently evaporating a liquid from a wood material, wherein the structure according to claim 5 or 6 oscillates a high frequency to the wood material sandwiched between a plurality of heating plates to dielectrically heat the wood material. A configuration including an oscillating means is added.

According to the invention of claim 8, the wood material is dielectrically heated to move the liquid at the center of the wood material to the surface portion, and the wood material is heated by the heating plate to smooth the liquid at the surface portion of the wood material. To evaporate.

[0021] Specifically, the means for solving the problems according to the invention of claim 8 is that a plurality of heat treatment devices for a wood material are provided with a plurality of heating medium flow passages through which the heating medium can flow, and which sandwich the wood material from the front and back surfaces thereof. A heating plate, a hermetic container for housing a plurality of heating plates sandwiching the wood material, a decompression unit for decompressing the interior of the hermetic container, and a heating medium supply unit for supplying a heating medium to the heating medium flow passage. A high frequency oscillating means for oscillating a high frequency with respect to the wood material sandwiched between the plurality of heating plates to dielectrically heat the wood material.

Further, according to the invention of claim 9, when a plurality of heating plates sandwiching a woody material, a plurality of woody materials and a heating plate and a plurality of woody materials between heating plates are laminated, the woody materials are brought into close contact with each other to form a woody material. In order to prevent the rampage, the structure of claim 7 or 8 is added to the structure including a pressing means for pressing the plurality of heating plates sandwiching the woody material from the front and back sides thereof.

[0023]

According to the structure of claim 1, when the pressure inside the closed container is reduced and the heating medium for solvent volatilization at a temperature at which the solvent of the injection liquid can be vaporized is circulated in the heating medium flow passage, the injection liquid in the wood material is Is heated under reduced pressure to a temperature at which the solvent is volatilized by the heated heating plate, so that the solvent in the injection liquid is smoothly volatilized from the wood material, and the residual ratio of the solvent is reduced.

Next, when the heating medium for injecting liquid curing which is higher in temperature than the heating medium for solvent volatilization and at a temperature at which the injecting liquid can be cured is circulated in the heating medium flow passage, the wood material is heated by the heating medium for injecting liquid curing. Since it is sandwiched between the heated heating plates, the injection liquid in the woody material is heated to a temperature higher than that of the heating medium for solvent volatilization and to a temperature at which the injection liquid can be cured, so that the injection liquid is surely cured. In this case, since the wood material is gradually or stepwise heated from the front and back surfaces by the heating plate, uneven heating is eliminated and the wood material is uniformly heated, so that a curing failure portion hardly occurs. In addition, since the wood material is heated from the front and back sides while being sandwiched by the heating plates, deformation such as warpage and bending is unlikely to occur.

Even if the solvent of the injectable liquid is flammable, the wood material is heated through the heating medium flowing through the heating medium flow passage, so that a fire occurs during the curing process of the injecting liquid. There is no risk of the solvent exploding.

Furthermore, by changing the temperature of the heating medium supplied to the heating medium flow passage of the heating plate, the solvent volatilization step and the injecting liquid curing step can be carried out continuously, so that the heating of the wood material is performed. Processing can be performed smoothly.

According to the structure of claim 2, when the solvent is volatilized from the injection liquid in the wood material, the wood material is heated by oscillating a high frequency continuously or intermittently with respect to the wood material. Since the solvent is heated from the inside by the high frequency, the solvent moves from the central portion of the wooden material to the surface portion, and the solvent is efficiently and smoothly vaporized from the surface portion of the wooden material by heating with the heating plate. In this case, the solvent in the wood material can be discharged from the wood material to the outside along with the solvent content gradient in the wood material, cracking in the wood material, warping,
Most desirable because it does not cause deformation such as twisting. To this end, the solvent can be volatilized particularly smoothly by adjusting the temperature of the heating plate, the degree of pressure reduction, the strength of the high frequency, and the like.

According to the third aspect of the present invention, when the injection liquid in the wood material is cured, the wood material is oscillated continuously or intermittently to heat the wood material. Since it is heated from the inside, the injection liquid is hardened uniformly from the central part to the surface part of the wood material. Therefore, the explosion caused by the vapor pressure of the solvent remaining in the central portion of the wood material is prevented.

According to the structure of claim 4, the wood material is heated under reduced pressure by the heating plate heated by the heating medium having a temperature capable of vaporizing the water in the wood material, and the high frequency wave is continuously or intermittently applied. The wood material is dielectrically heated to dry, so that the wood material can be dielectrically heated to quickly move the moisture in the central part of the wood material to the surface part, and the surface of the wood material is heated by the heating plate. The moved water can be evaporated particularly smoothly without causing deformation such as cracking or warping of the wooden material.

According to the structure of claim 5, when the wood material is heated by the heating plates sandwiched from the front and back surfaces thereof, the wood material is kept under reduced pressure and the heating medium having different temperatures is selectively supplied to the heating plate. Since it is possible to heat-treat the wood material under optimal conditions according to the material and thickness of the wood material, the type of liquid in the wood material, the evaporation temperature, etc., the wood material can be heated without causing deformation of the wood material. Can be modified or dried.

According to the structure of claim 6, a plurality of heating plates having a heating medium flow passage through which the heating medium can flow and sandwiching the wood material from the front and back surfaces thereof, and a plurality of heating plates sandwiching the wood material are housed. Since the pressure reducing means for bringing the inside of the closed container into a reduced pressure state and the heating medium for heating the solvent volatilization heating medium supply means for supplying the heating medium for heating the solvent volatilization to the heating medium flow path, the inside of the closed container is heated with the reduced pressure state. By circulating the heating medium for solvent volatilization in the medium flow passage, the solvent in the injecting liquid can be volatilized smoothly and efficiently from the wood material, and the wood material is not cracked or deformed such as warped. The residual rate can be reduced.

In addition, since the heating medium flow passage is provided with a heating medium supply medium for injecting liquid curing that allows the heating medium for injecting liquid curing to flow at a temperature higher than that of the heating medium for solvent volatilization, the injection medium curing heating medium supply means can be provided. The wood material can be heated from the front and back sides by a heating plate. Therefore, heating unevenness is eliminated and the wood material is heated uniformly so that a curing failure portion is less likely to occur, and since the wood material can be heated while being sandwiched by the heating plates from the front and back surfaces, the wood material is not warped or warped. Deformation such as bending hardly occurs.

Further, control for controlling the solvent volatilization heating medium supply means and the solvent curing heat medium supply means so that the solvent volatilization heating medium or the injection liquid curing heat medium is selectively supplied to the heating medium flow passage. Due to the provision of the means, by continuously supplying different heating media for solvent volatilization and injection liquid curing to the heating medium flow passage, the solvent volatilization process and the injection liquid curing process are continuously performed. Since it can be performed, the heat treatment of the wood material can be performed smoothly and promptly.

Since the wood material sandwiched between the plurality of heating plates is provided with the high-frequency oscillating means for dielectrically heating the wood material by dielectrically heating the wood material, the wood material is dielectrically heated. The liquid in the central part of the wood material can be quickly moved to the surface part, and the liquid moved to the wood material surface part by heating the surface part of the wood material with the heating plate is cracked or warped in the wood material. The effect of being able to evaporate particularly smoothly without causing the deformation of In this case, since the heating plate is heated via the heating medium flowing through the heating medium flow passage, even if a high frequency is oscillated by the high frequency oscillating means, the heating plate is not damaged by the high frequency.

According to the eighth aspect of the present invention, since the high frequency oscillating means for oscillating a high frequency to the wood material sandwiched between the plurality of heating plates to dielectrically heat the wood material is provided, the wood material is dielectrically heated. The liquid in the central part of the wood material can be moved to the surface part. Further, since the heating medium is provided with a plurality of heating plates having a heating medium flow passage through which the heating medium can flow and sandwiching the wooden material from the front and back surfaces thereof, and a decompression means for decompressing the inside of the closed container, the wooden material is By heating under reduced pressure with the heating plate, the liquid that has moved to the surface portion of the wooden material can be evaporated smoothly as in the above.

Further, since the wood material is dielectrically heated by the high frequency oscillating means while being sandwiched by the heating plates from the front and back surfaces thereof, the wood material is warped and distorted despite being dielectrically heated by the high frequency oscillating means. Further deformation does not occur.

Further, since the heating plate is supplied through the heating medium supplied by the heating medium supply means and flowing through the heating medium flow passage, even if a high frequency is oscillated by the high frequency oscillation means, the heating plate is damaged by the high frequency. I will not receive it.

According to the structure of claim 9, since the plurality of heating plates sandwiching the woody material are provided with the pressing means for pressing from the front and back directions, the woody material and the heating plate and the woody material are provided with each other. Since there is no gap, deformation of the wood material such as warpage and twist is further suppressed.

[0039]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall construction of a heat treatment apparatus for woody materials, which is an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a cylindrical closed container extending in the front-rear direction (left-right direction in FIG. 1). Then, the rear end portion (right side in FIG. 1) of the closed container 1 is covered by the closing mirror plate 1a. A front end portion (left side in FIG. 1) of the closed container 1 can be opened and closed by a lid body 3 made of an end plate installed on a movable carriage 2 that is movable in the front-rear direction.

A guide rail 4 extending in the front-rear direction is laid on the inner bottom of the closed container 1, and a mounting carriage 5 is arranged on the guide rail 4 so as to be movable in the front-rear direction.
The front end portion of the mounting carriage 5 is covered with a lid 3 by a connecting tool (not shown).
The installation carriage 5 moves in the front-rear direction in conjunction with opening and closing of the lid 3.

A heating medium header 6 is erected on the upper surface of the front end of the mounting carriage 5, and a heating medium tank 7 as a heating medium supply device is arranged at an appropriate place outside the closed container 1. The heating medium supply side of the heating medium tank 7 is connected to the medium introduction part 6a of the heating medium header 6 by a heating medium supply passage 9 having a circulation pump 8, and the heating medium return side of the heating medium tank 7 is a heating medium return passage. It is connected to the medium outflow portion 6 b of the heating medium header 6 by 10. The heating medium tank 7, the circulation pump 8 and the heating medium supply passage 9 described above constitute a heating medium supply means for solvent volatilization and / or a heating medium supply means for injecting liquid curing.

A pressing means 11 is arranged at the center of the upper part of the closed container 1. The pressing means 11 is a hydraulic cylinder 12 fixed to the central part of the upper surface of the closed container 1 and the inside of the closed container 1. It is composed of a horizontal pressing plate 13 arranged above. The upper surface of the horizontal pressing plate 13 is fixed to the tip of the rod of the hydraulic cylinder 12 that penetrates the upper wall surface of the closed container 1 in an airtight state, and the horizontal pressing plate 13 can move up and down as the hydraulic cylinder 12 operates. .

A plurality of wood-based materials a sandwiched by a heating plate 14 in a sandwich shape are placed on the mounting carriage 5, and the heating plate 14 and the wood-based material a are lowered to the horizontal pressing plate 13. It is clamped by the mounting carriage 5.

The pressing means 11 is not limited to the one having the above structure, and the stacked wood material a is pressed against the mounting carriage 5 such as a clamp to heat the wood material a. Any structure may be used as long as it can be prevented from being deformed.

As shown in FIGS. 2 and 3, the heating plate 14 is formed in a hollow shape by a metal plate such as an aluminum plate having good thermal conductivity, and the heating plate 14 has a meandering state in the hollow portion. A heating medium flow passage 15 made of a copper pipe or the like that is bent and arranged is provided. The upstream end and the downstream end of the heating medium flow passage 15 are polytetrafluoroethylene (trade name:
Each of them is detachably connected to the heating medium header 6 via a flexible connecting pipe 16 made of an insulating material such as Teflon.

A vacuum pump 17 as a pressure reducing means is provided at a proper place outside the closed container 1, and the vacuum pump 17 is provided.
The suction side of is communicated with the inside of the closed container 1 via the suction pipe 18. A heat exchanger 19 is provided in the middle of the suction pipe 18, and a condensate tank 20 and a cooler 21 are connected to the heat exchanger 19 via pipes.

A high frequency oscillating device 22 is arranged outside the closed container 1 at a proper place. The heating plate 14 also serves as an electrode plate for applying a high frequency electric field to the wood material a,
As shown in FIG. 4, the uppermost heating plate 14 a and the lowermost heating plate 14 b are connected to the − of the high-frequency oscillator 22 by the conductive wire 23.
The central heating plate 14c is connected to the pole and is connected to the + pole of the high-frequency oscillator 22 by a conductor 23. The heating plates 14 other than the above heating plates 14a, 14b and 14c are free electrode plates.

A method of heat-treating a plate-shaped woody material a having a relatively large thickness using the above-mentioned woody material heat treatment apparatus will be described below.

First, an appropriate wood material a such as a lumber product, plywood, LVL, and veneer, and an agent such as a preservative, insect repellent, and flame retardant,
Alternatively, after injecting an injection liquid made of a synthetic resin liquid or the like, the wood material a is sequentially placed on the mounting carriage 5 in a state of being sandwiched by the heating plates 14 arranged above and below the wood material a. This work can be performed as follows. That is, by opening the lid 3 of the closed container 1 to the front, the loading carriage 5
Is pulled out of the closed container 1 along the guide rail 4. Next, the heating plate 14b arranged on the lowermost side is placed on the mounting carriage 5, and the wood material a and the other heating plate 14 are alternately laminated on the heating plate 14b to form a laminated body. After forming, the upstream end and the downstream end of the heating medium flow passage 15 of each heating plate 14 are respectively connected to the heating medium header 6 via the flexible connection pipe 16. Next, the lid 3 is moved rearward to house the loading carriage 1 on which the laminated body is placed inside the closed container 1, and then a side door (not shown in the drawings) provided on a side portion of the closed container 1 is placed. Open), and the conductor 23 of the high-frequency oscillator 22 is heated through the opening to the heating plates 14a, 14
b, 14c.

After that, the hydraulic cylinder 12 is operated and the horizontal pressing plate 13 is lowered to place the stack of the wooden material a and the heating plate 14 housed in the closed container 1 on the horizontal pressing plate 13. It is clamped by the carriage 5.

Thereafter, the vacuum pump 17 is operated to bring the inside of the closed container 1 to 100 Torr or less, preferably 30 to 6
The pressure is reduced to 0 Torr, and the heating medium tank 30
The hot water heated to -60 ° C. is supplied from the heating medium supply passage 9 through the heating medium header 6 to the heating medium flow passage 15 in each heating plate 14 by operating the circulation pump 8, and is circulated.

In the above case, water is heated in the heating medium tank 7 from room temperature to hot water of a desired temperature, further 100
It is configured such that it can be continuously moved up and down to steam exceeding ℃, and these are supplied by the circulation pump 8. Instead of this, hot water from normal temperature to high temperature is heated from the heating medium tank 7 to the heating medium header. 6 and the steam may be supplied to the heating medium header 6 from another line. In this case, it is necessary to control switching between hot water and steam.

As described above, when the pressure inside the closed container 1 was reduced to a desired pressure and the heating plate 14 was kept at 30 to 60 ° C. by flowing hot water at 30 to 60 ° C., the wood material a was injected. The solvent of the injection liquid is gradually volatilized into the closed container 1, and the evaporated solvent is introduced into the heat exchanger 19 from the closed container 1 through the suction pipe 18, and then liquefied by the heat exchanger 19 to condense the tank 20. Will be recovered in. Such a solvent volatilization treatment is performed in accordance with a heating schedule in which the degree of pressure reduction and the temperature of the heating plate 14 are changed according to the type of wood material a, the thickness of the material, and the type of injecting liquid containing the solvent. Perform until the content rate reaches 30%.

In this way, the volatilization of the solvent in the wooden material a is
Since it is performed under reduced pressure in a low temperature range, there is no risk of ignition even with a flammable solvent.

The heating plate 14 is operated by operating the high-frequency oscillator 22 when the solvent of the injection liquid is volatilized.
In addition to the heating by the heating plates 14a, 14
It is preferable to perform high frequency heating with b and 14c.
The reason is as follows. Heating plate 1 in the above temperature range
The heating of the wood-based material a according to No.
When the solvent volatilization progresses to a point below the fiber saturation point, the volatilization rate of the solvent becomes slow, and it may take time to volatilize the solvent and sufficient volatilization cannot be performed. However, when high-frequency heating is performed in addition to the heating by the heating plate 14 as described above, the internal temperature of the woody material a becomes higher than the surface temperature, and the portion with a large amount of solvent is more likely to generate heat than other portions. For this reason, in a thick woody material having a high solvent content rate inside and variation in the solvent content distribution, the volatilization of the solvent can be averaged and the solvent can be volatilized smoothly and quickly.

As described above, the wood material a in the low temperature range a
After performing the solvent volatilization treatment step in the inside for an appropriate time, the heating plate 14 is heated under reduced pressure or normal pressure to move to the curing treatment step of the injection liquid injected into the wood material a.

Although the solvent volatilization treatment step and the injecting liquid curing treatment step are continuously carried out, the heating temperature of the injecting liquid, the degree of depressurization and the temperature rising rate are also set in the injecting liquid curing treatment step as in the case of the solvent evaporation. The temperature is appropriately controlled by a temperature controller, a program controller, or the like according to the type or material thickness of the injection liquid injected into the wooden material a.

In the hardening treatment of the injection liquid, hot water in the heating medium tank 7, steam obtained by vaporizing the hot water or steam from another pipe can be used as a heating medium.
By supplying and circulating the high-temperature heating medium from the heating medium header 6 to the heating medium flow passage 15 in each heating plate 14 in this way, the heating plate 14 can be raised to the temperature required for curing the injecting liquid at once. it can.

When the heating medium is switched from warm water to steam, the warm water remaining in the pipes and medium passage is returned to the heating medium tank 7 through the heating medium return passage 10 or discharged through an appropriate drain passage. in this case,
The above switching operation, vapor pressure of steam, supply amount, supply time and the like are automatically performed by the control device. By the heating plate 14 heated to 100 ° C. or higher by the steam, the wood material a is heated uniformly from the front and back surfaces thereof, so that the injecting liquid inside is cured without causing a defective curing portion.

After the wood material a is heated for a predetermined time to cure the injection liquid, the wood material a is allowed to cool naturally in the closed container 1, or the heating medium to be circulated in the heating plate 14 is changed from steam to hot water. And the temperature of the heating plate 14 is changed to wood material a.
Forced cooling is performed by gradually lowering the temperature so that it does not adversely affect. Then, the wooden material a is pulled out from the closed container 1 and taken out from between the heating plates 14.

When injecting the injection liquid prepared under the curing condition of 100 ° C. or lower into the wood material a, it is natural to heat it with warm water instead of steam.

Also in the curing process of the injection liquid as described above, the inside of the closed container 1 is kept under a desired reduced pressure, and the solvent and other volatilized components remaining in the wood material a are closed. It is preferable to forcibly remove it outside of the above, but instead of this, the inside of the closed container 1 may be kept at normal pressure, and the injection liquid in the woody material a may be cured by a heating medium. After that, the pressure inside the closed container 1 may be reduced to remove the volatile components.

In addition, in the hardening process of the injection liquid, in addition to the heating from the heating plate 14 by the heating medium, the high-frequency oscillator 22 is operated to heat the inside of the wood material a by high-frequency heating, as in the solvent volatilization process. You may. Heating plate 14
Is heating by the heating medium flowing through the heating medium flow passage 15 rather than heating by the heating wire as in the conventional case,
The heating medium is not adversely affected even when the high frequency oscillator 22 is operated. In this case, temperature control by high frequency heating is controlled by a temperature controller. Further, according to the heating schedule of the wood material a, heating by only the heating plate 14 by the heating medium and heating by the combined use of the heating medium and the high frequency can be selected in both the solvent volatilization step and the injecting liquid curing step. It is the same.

In addition, the heating medium flow passage 15 in the heating plate 14
As the heating medium to be circulated, ethylene glycol, propylene glycol, silicone oil or the like may be used in addition to the above-mentioned hot water and steam, but using hot water is advantageous in terms of cost and handling.

Further, in the above embodiment, the case where the injection liquid such as the synthetic resin liquid injected into the wood material a is cured has been described, but the heat treatment method and heat treatment apparatus for the wood material according to the present invention are However, the present invention is not limited to the hardening process of the injecting liquid, and can be used in the case of evaporating the water in the wooden material a to dry the wooden material a.

In this case, the vacuum pump 17 is operated to reduce the pressure inside the closed container 1 to, for example, 30 to 60 Torr, and the hot water heated to 30 to 60 ° C. in the heating medium tank 7 is circulated. 8 to operate to supply heating medium 9
It is preferable that the wood material a is dried by supplying and circulating the heating medium through the heating medium header 6 to the heating medium flow passage 15 in each heating plate 14 and operating the high frequency oscillation device 22.

Specific examples of the present invention will be described below.

<Specific Example 1> First, as a processing material, thickness:
27 mm, width: 100 mm, length: 1.8 m of Batsuga lumber product was prepared, and a dehydration-condensation-type resin aqueous solution (phenol resin) as an injection liquid was injected into the treated material at room temperature. The two injected lumber products were placed in a state in which they were stacked between the heating plates 14 and stored in the closed container 1.

Thereafter, a flexible connecting pipe 16 is attached to each heating plate 14.
And the conducting wire 23 of the high-frequency oscillator 22 was connected to the heating plate 14 corresponding to the high-frequency negative electrode and positive electrode. Next, hot water is supplied to the heating plate 14 through the flexible connecting pipe 16 and circulated, and the degree of pressure reduction is 50 Torr.
Temperature: about 45 ° C. A heat treatment under reduced pressure was performed, and a high frequency was oscillated intermittently.

After that, when the treatment material was dried until the water content became about 30%, the temperature of the hot water was raised stepwise to raise the temperature of the heating plate 14 and the temperature of the heating plate 14 was changed. The treated material was further dried while adjusting the degree of vacuum. Also at this time, high frequency was oscillated intermittently.

After that, when the treatment material was dried until the water content became about 10%, the heating medium was switched from warm water to steam and the heating plate 14 was heated stepwise. Then, when the temperature of the treatment material reached a predetermined temperature (140 ° C.), the treatment material was held at the set temperature for a predetermined time (3 hours) to cure the synthetic resin aqueous solution.

After that, the heat treatment was stopped, the temperature of the treated material was lowered by slow cooling, and the inside of the closed container 1 was returned to normal pressure to obtain modified wood.

<Specific Example 2> First, as the processing material, thickness:
Prepared a Betsutsuga lumber product having a size of 27 mm, a width of 100 mm and a length of 1.8 m, and in the treated material, 100 parts by weight of a dehydration condensation type phenol resin aqueous solution (solid content concentration 10%) and paratoluene as a curing agent. A resin aqueous solution containing sulfonic acid: 0.5 part by weight was injected at room temperature. Next, the heating plate 1 with the two lumber products into which the aqueous resin solution has been poured is stacked.
It was placed between 4 and housed in the closed container 1.

Thereafter, a flexible connecting pipe 16 is attached to each heating plate 14.
And the conducting wire 23 of the high-frequency oscillator 22 was connected to the heating plate 14 corresponding to the high-frequency negative electrode and positive electrode. Next, hot water is supplied to the heating plate 14 through the flexible connecting pipe 16 and circulated, and the degree of pressure reduction is 50 Torr.
Temperature: about 45 ° C., vacuum drying was performed for 5 days, and high frequency was oscillated intermittently.

After that, when the treatment material was dried until the water content became about 30%, the temperature of the hot water was raised stepwise from about 45 to about 90 ° C. to raise the temperature of the heating plate 14. . Then, the treatment material was held at a temperature (80 to 90 ° C.) sufficient for curing the synthetic resin liquid for about 1 day to cure the resin aqueous solution.

After that, the heat treatment was stopped, the temperature of the treated material was lowered by slow cooling, and the inside of the closed container 1 was returned to normal pressure to obtain modified wood.

<Specific Example 3> A Bettsuga lumber product injected with an aqueous resin solution under the same conditions as in Specific Example 1 described above was set under the same conditions as in Specific Example 1 except that high-frequency oscillation was not performed. Heat treatment was performed to obtain modified wood.

[0079]

As described above, according to the heat treatment method for a wood material according to the first aspect of the present invention, the heating medium for solvent volatilization is circulated in the heating medium flow passage in a state where the inside of the closed container is in a depressurized state. The solvent in the injectate is heated under reduced pressure to volatilize smoothly and efficiently, and then the heating medium for solvent curing is circulated in the heating medium flow passage to cure the injectate, so that the residual rate of the injectate is Since the amount is reduced, the modification effect is improved, and the defective curing portion of the injection liquid is less likely to occur.

Further, since the heating medium for injecting liquid curing is circulated in the heating medium flow passage of the heating plate while the wooden material is sandwiched between the front and back surfaces of the wooden material to cure the injecting liquid, uneven heating is eliminated. The material is heated uniformly so that a defective curing portion is unlikely to occur, and deformation such as warpage or bending hardly occurs.

Further, even if the solvent of the injection liquid is flammable, the wood material is heated through the heating medium flowing through the heating medium flow passage, so a fire may occur during the curing process of the injection liquid. There is no danger of the solvent exploding.

According to the heat treatment method for a wood material according to the second aspect of the present invention, the solvent of the injection liquid is volatilized while oscillating a high frequency with respect to the wood material, so that the solvent moves from the central portion to the surface portion of the wood material. After that, since it volatilizes smoothly from the surface portion, the modifying effect is further improved and the defective curing portion of the injecting liquid is further less likely to occur.

According to the heat treatment method for a wood material according to the third aspect of the present invention, since the injection liquid is cured while oscillating a high frequency with respect to the wood material, the injection liquid is uniformly applied from the central portion to the surface portion of the wood material. As it hardens, the explosion caused by the vapor pressure of the solvent remaining in the central portion of the wood-based material is prevented.

According to the heat treatment method for a wood material according to the invention of claim 4, the wood material is heated under reduced pressure by a heating plate heated by a heating medium at a temperature at which water in the wood material can be volatilized. At the same time, the high frequency is oscillated continuously or intermittently to dry by dielectric heating,
Dielectric heating can heat the wood material dielectrically to quickly move the moisture in the center of the wood material to the surface, and the moisture that has moved to the surface of the wood material due to heating by the heating plate can be cracked or warped in the wood material. It is possible to evaporate particularly smoothly without causing deformation such as.

According to the heat treatment apparatus for a wood material according to the invention of claim 5, heating medium supply means for selectively supplying the heating medium of different temperatures to the heating medium flow passage of the heating plate via the supply pipe, Since it is provided with a decompression means for decompressing the inside of the closed container that houses the heating plate, when heating the wood material with the heating plate, the wood material is placed under the decompression condition and the heating medium of different temperature is applied to the heating plate. Since it can be selectively supplied, the wood material can be heat-treated under optimum conditions according to the material and thickness of the wood material, the type of the injecting liquid or water in the wood material, the evaporation temperature, etc. The woody material can be modified or dried without causing deformation of the material.

According to the heat treatment apparatus for a wooden material of the sixth aspect of the present invention, there is provided a decompression means for decompressing the inside of the closed container containing the heating plate sandwiching the wooden material, and a solvent in the heating medium flow passage of the heating plate. Since it is equipped with a solvent volatilization heating medium supply means for supplying the volatilization heating medium, the injection liquid in the woody material can be heated under reduced pressure, so that the residual ratio of the solvent is reduced and the reforming effect is improved. As well as improving, it becomes difficult for a defective curing portion of the injection liquid to occur.

Further, since the heating medium supply means for supplying the heating medium for injecting liquid curing is provided in the heating medium flow passage of the heating plate, the wood material can be heated by the heating plate from the front and back surfaces thereof. Since the wood material is heated uniformly, the curing failure is unlikely to occur, and the wood material can be heated while being sandwiched between the front and back surfaces by the heating plate, so that the wood material is not deformed such as warped or bent. Is unlikely to occur.

Furthermore, since the heating medium supply means for solvent volatilization and the control means for controlling the heating medium supply means for solvent curing are provided, the heating medium for solvent volatilization and the heating medium for injecting liquid curing are provided in the heating medium flow passage. Since the solvent can be continuously supplied and the solvent volatilization step and the injection liquid curing step can be continuously performed, the heat treatment of the wood material can be smoothly performed.

According to the heat treatment apparatus for a wood material according to the invention of claim 7, since the high frequency oscillating means for oscillating a high frequency to dielectrically heat the wood material is provided, the wood material is dielectrically heated to cause the wood material central portion. The liquid can be quickly moved to the surface part, and by heating the surface part of the wood material with a heating plate, the liquid that has moved to the wood material surface part is not broken or warped in the wood material. Since it can be evaporated smoothly, it is possible to efficiently perform the drying treatment of the wood material or the curing treatment of the injection liquid in the wood material.

According to the heat treatment apparatus for a wood material according to the invention of claim 8, a plurality of heating plates having a heating medium flow passage through which a heating medium can flow and sandwiching the wood material from the front and back surfaces thereof are provided. Since it is provided with a high-frequency oscillating means for dielectrically heating and a depressurizing means for depressurizing the inside of the closed container
After the wood material is dielectrically heated and the liquid in the center of the wood material is quickly moved to the surface part, it can be evaporated from the surface part, so that the liquid in the center part of the wood material can be smoothly evaporated as described above. You can

Further, since the wood material is dielectrically heated by the high frequency oscillating means in a state of being sandwiched by the heating plates from the front and back surfaces thereof, the wood material is warped or distorted despite being dielectrically heated by the high frequency oscillating means. Deformation does not occur.

Further, since the heating plate is supplied through the heating medium supplied by the heating medium supply means and flowing through the heating medium flow passage, even if a high frequency is oscillated by the high frequency oscillation means, the heating plate is damaged by the high frequency. I will not receive it.

Therefore, according to the invention of claim 8, the wood material can be smoothly heat-treated without causing deformation such as warpage or distortion in the wood material and without impairing the heating means.

According to the heat treatment apparatus for a wood material according to a ninth aspect of the present invention, the wood material and the heat plate are provided because they are provided with a pressing means for pressing a plurality of heating plates sandwiching the wood material from the front and back sides thereof. No gap is formed between the heating plate and the heating plate and between the wood materials, so that the wood material can be further prevented from being deformed such as warped or twisted.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a heat treatment apparatus for a wood material according to an embodiment of the present invention.

FIG. 2 is a perspective view of a heating plate in the heat treatment apparatus for the wood material.

FIG. 3 is a plan view of a heating plate in the heat treatment device for a wooden material.

FIG. 4 is a schematic cross-sectional front view of an airtight container in the heating device for a wooden material.

[Explanation of symbols]

a ... wood material 1 ... Airtight container 7 ... Heating medium tank 8 ... Circulation pump 9 ... Heating medium supply path 14 ... Heating plate 15 ... Heating medium flow passage 17 ... Vacuum pump (pressure reducing means) 22 ... High-frequency oscillator (high-frequency oscillator)

Claims (9)

[Claims] 1. A hermetically sealed container, in which a wood material filled with an injection liquid such as a synthetic resin liquid is sandwiched by heating plates having heating medium flow passages through which heating medium can flow from the front and back surfaces of the wooden material. The heating medium for solvent volatilization at a temperature capable of volatilizing the solvent of the injecting liquid is circulated through the heating medium flow path together with the heating medium to vaporize the solvent from the injecting liquid in the wood material, and then the above. A heating medium for injecting liquid curing at a temperature higher than that of the heating medium for solvent volatilization and at a temperature capable of curing the injecting liquid is circulated in the heating medium flow passage to cure the injecting liquid in the woody material. Heat treatment method for wood materials. 2. The method according to claim 1, wherein when the solvent is volatilized from the injection liquid in the wood material, a high frequency is continuously or intermittently oscillated with respect to the wood material to dielectrically heat the wood material. Heat treatment method for wood materials. 3. The method according to claim 1 or 2, wherein when the injection liquid in the wood material is cured, a high frequency is continuously or intermittently oscillated with respect to the wood material to dielectrically heat the wood material. Heat treatment method for wood materials. 4. A wood material is sandwiched by heating plates having heating medium flow passages through which a heating medium can flow from the front and back sides in a closed container, and then the closed container is depressurized to the heating medium flow passage. A heat treatment of a wood material, characterized in that a heating medium having a temperature capable of volatilizing water in the wood material is circulated and a high frequency is continuously or intermittently oscillated with respect to the wood material to dry the wood material. Method. 5. A plurality of heating plates having a heating medium flow passage through which a heating medium can flow and sandwiching a wood material from the front and back surfaces thereof, and a closed container accommodating the plurality of heating plates sandwiching the wood material, Decompression means for reducing the pressure inside the closed container, and heating for adjusting the heating temperature, which is provided outside the closed container and selectively supplies a heating medium having a different temperature to the heating medium flow passage through a supply pipe. A heat treatment apparatus comprising: a medium supply unit. 6. A plurality of heating plates having a heating medium flow passage through which a heating medium can flow and holding a wood material into which an injection liquid such as a synthetic resin liquid has been injected, from the front and back surfaces thereof, and the wood material. A closed container containing a plurality of heating plates, a decompression means for bringing the closed container into a decompressed state, and a solvent for supplying a heating medium for solvent volatilization at a temperature at which the solvent of the injection liquid can be volatilized in the heating medium flow passage. A heating medium supply means for volatilization, and a heating medium supply medium for injecting liquid supply, which supplies a heating medium for curing the injection liquid to the heating medium flow passage at a temperature higher than that of the heating medium for solvent volatilization and at a temperature at which the injection liquid can be cured. Means and a heating medium supply means for solvent volatilization and a heating medium supply means for curing injection liquid so that the heating medium for solvent volatilization or the heating medium for injection liquid curing is selectively supplied to the heating medium flow passage. Control A heat treatment device for a wood material, comprising: a control means. 7. The high frequency oscillating means for oscillating a high frequency with respect to the wood material sandwiched between the plurality of heating plates to dielectrically heat the wood material, according to claim 5 or 6. Heat treatment equipment for wood materials. 8. A plurality of heating plates having a heating medium flow passage through which a heating medium can flow and sandwiching a wood material from the front and back surfaces thereof, and a closed container for housing the plurality of heating plates sandwiching the wood material, A decompression means for decompressing the inside of the closed container, a heating medium supply means for supplying a heating medium to the heating medium flow passage, and a high frequency oscillating high frequency with respect to the wood material sandwiched between the plurality of heating plates. A heat treatment apparatus for a wood material, comprising: a high-frequency oscillating means for dielectrically heating the wood material. 9. The heat treatment apparatus for a wood material according to claim 7, further comprising a pressing means for pressing the plurality of heating plates sandwiching the wood material from the front and back directions thereof.