KR102322516B1 - Method for drying and high heat-treating wood to produce high-strength wood - Google Patents

Abstract

The present invention relates to a method for drying and treating wood with high heat to manufacture high-strength wood capable of remarkably improving practicality of wood manufactured by drying and treating soft wood with the high heat and to have strength similar to hard wood. The method for drying and treating wood with high heat comprises: a wood selecting step of selecting the wood (S1); an initial weight measuring step of measuring a weight of a drying chamber before mounting the wood (S2); a mounting weight measuring step of mounting the wood selected in the drying chamber and measuring the weight of the drying chamber (S3); a wood weight calculating step of calculating the weight of the wood mounted in the drying chamber by weight calculation (S4); a vacuum forming step of forming vacuum in the drying chamber (S5); a wood preheating step of preheating the wood of the drying chamber (S6); a superheating steam high-heat treating step of drying and treating the wood with the high heat by injecting superheating steam into the inside of the drying chamber (S7); a moisture content calculating and maintaining step of calculating and maintaining a moisture content by measuring the weight of the wood inside the drying chamber (S8); a temperature lowering step of lowering a temperature inside the drying chamber to a predetermined range (S9); a pressure lowering step of lowering pressure inside the drying chamber (S10); and a natural cooling and aging step of naturally cooling and aging the wood of the drying chamber (S11).

Description

Wood drying and high heat treatment method for manufacturing high strength wood

The present invention relates to a method and apparatus for drying and high heat treatment of wood for drying and high heat treatment of wood, and more particularly, the practicality of wood produced by drying and high heat treatment of softwood to have a strength similar to that of hardwood. It relates to a method of drying and high heat treatment of wood for the production of high-strength wood that can be significantly improved.

In general, wood has a relatively high moisture content during logging. If a product is made using the felled wood as it is, the product will be deformed over time. Therefore, the harvested wood requires an appropriate drying process.

There are two types of drying methods for wood, natural drying and hot air drying. Natural drying is a method of stacking wood in a drying field and drying it using atmospheric temperature, humidity and wind. It takes a long time, requires a large drying field, and has the disadvantage that it cannot be dried below the air-dry moisture content.

On the other hand, hot air drying is a method of drying by artificially controlling drying conditions such as temperature, humidity and wind speed in a drying room, and has the advantage of relatively short drying time and drying below the air-drying moisture content.

When the wood is dried and subjected to high heat treatment, the moisture content is greatly reduced and the water absorption capacity is lowered, and hemicellulose, which is a food for bacteria among the components of wood, is decomposed, making it difficult for putrefactive bacteria to live. As such, high heat treatment and drying can significantly improve the durability of wood. Recently, wood has been treated and dried at high heat and used for various purposes.

As a conventional apparatus for drying and high-temperature processing of wood, for example, an electric heater is installed directly in the drying chamber to heat the internal air, or the air heated through a hot air blower that obtains heat from a combustion apparatus is heated in the drying chamber. There are a device for injecting into the chamber, a device for indirectly heating the air in the drying chamber by injecting it into the drying chamber after heating the heating medium in the combustion device, and a device for injecting superheated steam into the drying chamber.

However, the prior art as described above has the following problems.

Dry and heat-treated wood produced using the conventional drying and heat treatment apparatus as described above is a method of increasing the strength by heat-treating softwood such as conifers in general, but without the addition of artificial synthetic resin, similar or higher strength than hardwood Branches could not produce wood, so there was a problem in that practicality was lowered.

Patent Publication No. 2015-0120028 "Method for heat treatment of wood and wood materials with increased durability and weather resistance" (2015.10.27.)

Accordingly, the present invention has been devised to solve the various problems of the prior art,

An object of the present invention is to provide a wood drying and high heat treatment method for manufacturing high-strength wood, in which the practicality of the produced wood is remarkably improved by drying and high heat treatment of softwood to have a strength similar to that of hardwood.

In order to achieve the above object, the "wood drying and high heat treatment method for manufacturing high-strength wood" according to the present invention includes a drying chamber for accommodating wood, a steam injection pipe connected to the drying chamber, and the steam injection pipe A steam generator connected to, a gas discharge pipe connected to the drying chamber, a load sensor installed in the drying chamber, and an external discharge pipe connected to the gas discharge pipe and connected to the outside are provided, and a recirculation connection connected to the steam generator A method for drying and high heat treatment of wood using a wood drying and high heat treatment apparatus including a discharge pump provided with a pipe; A wood sorting step of selecting and preparing wood that has a moisture content between 20 and 25% and has the same size; an initial load measurement step of measuring the load of the drying chamber in an empty state by not mounting wood with the load sensor; a load measurement step of loading the selected wood in the drying chamber and measuring the load of the drying chamber on which the wood is mounted with the load sensor; a wood load calculation step of calculating the load before drying of the loaded wood by calculating the load of the drying chamber measured in the initial load measurement step and the drying chamber load measured in the payload measurement step; a vacuum forming step of sealing the drying chamber, operating the discharge pump, sucking air inside the drying chamber through the gas discharge pipe, and discharging it to the outside through the external discharge pipe to form a vacuum state; After a vacuum is formed in the drying chamber, the steam generator is operated to inject steam into the drying chamber through the steam injection pipe to raise the temperature inside the drying chamber from room temperature to 100 degrees Celsius, and the drying chamber A wood preheating step of preheating the wood accommodated in the interior; By operating the steam generator and injecting superheated steam into the inside of the drying chamber through the steam injection pipe, the temperature inside the drying chamber is maintained at 140°C to 170°C for 2 hours to 4 hours while the drying chamber A superheated steam high heat treatment step of heating the wood accommodated therein, drying and high heat treatment; While the wood is heated, the total weight of the drying chamber is measured through the load sensor to derive the weight after drying of the wood, and the weight before drying of the wood and the weight after drying of the wood are compared to determine the change in the moisture content of the wood. a moisture content calculation and maintenance step of calculating and maintaining high heat treatment until the moisture content of the wood reaches a target moisture content through the calculation; After the high heat treatment of the wood is completed, the steam generator is stopped and the discharge pump is operated, from the steam generator to the steam injection pipe through the recirculation connection pipe, from the steam injection pipe to the inside of the drying chamber, from the drying chamber to the gas discharge pipe a temperature lowering step of lowering the temperature of the wood while lowering the temperature inside the drying chamber to 80 to 100 degrees Celsius by circulating the internal air from the gas discharge pipe to the discharge pump; After the temperature drop is completed, the steam generator is operated to inject steam into the inside of the drying chamber through the steam injection pipe, and the air inside the drying chamber is intermittently supplied through the external discharge pipe over 2 to 3 hours. a pressure lowering step of lowering the internal pressure of the drying chamber to atmospheric pressure by discharging to the evaporator; A natural cooling and aging step of aging the wood while naturally lowering the temperature of the drying chamber to room temperature by maintaining the inside of the drying chamber in a sealed state for 2 to 4 days after the pressure drop is completed; characterized by including.

In addition, the superheated steam high heat treatment step of the "wood drying and high heat treatment method for manufacturing high strength wood" according to the present invention operates the discharge pump to inject steam from the steam generator to the steam injection pipe through the recirculation connection pipe A superheated steam circulation process for saving energy by circulating the superheated steam injected into the drying chamber from the pipe to the inside of the drying chamber, from the drying chamber to the gas discharge pipe, from the gas discharge pipe to the discharge pump, and circulating the internal air; It characterized in that it further comprises a wood vinegar extraction process of extracting the wood vinegar generated by the high heat treatment of wood inside the drying chamber while the superheated steam is circulated to the outside of the drying chamber.

In addition, the temperature lowering step of the "wood drying and high heat treatment method for manufacturing high-strength wood" according to the present invention is performed by injecting the wood vinegar extracted in the wood vinegar extraction process through the external discharge pipe, and internal air inside the drying chamber The wood vinegar application and cooling process for cooling the wood while the wood vinegar is circulated by evaporation and applied to the wood, and a filter is installed in the conduit of the recirculation connection pipe to the outside of the drying chamber so that the internal air and wood vinegar are discharged from the pump It characterized in that it further comprises a foreign matter removal process of filtering and removing foreign substances contained in wood vinegar and internal air while being forcibly circulated by the.

In addition, the natural cooling and aging step of the "wood drying and high heat treatment method for manufacturing high-strength wood" according to the present invention is performed by spraying a natural disinfectant into the inside of the drying chamber while the drying chamber is closed to the wood. Further comprising the process of applying a disinfectant to be applied, the natural disinfectant contains cypress extract, lemon extract, garlic extract, ginger extract, ginkgo leaf extract, Smilax china L. leaf extract, paulownia leaf extract, neem oil, and pine oil characterized in that

The present invention, as described above, by drying and high heat treatment of softwood to have a strength similar to that of hardwood, the practicality of the produced wood is significantly improved, and thus the deck, design type, which is exposed to the external environment and requires high strength. It has the effect that it can be appropriately used as a fence, a wooden fence, and the like.

1 is a schematic longitudinal cross-sectional view of a wood drying and high heat treatment apparatus used in a wood drying and high heat treatment method according to the present invention;
Figure 2 is a step diagram showing a wood drying and high heat treatment method according to the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings. However, it should be understood that the present invention may be embodied in many different forms and is not limited to the described embodiments.

1 is a schematic longitudinal sectional view of a wood drying and high heat treatment apparatus used in a wood drying and high heat treatment method according to the present invention. As shown in this figure, the wood drying and high heat treatment apparatus used in the present invention includes a drying chamber 10 for accommodating wood (W), a steam injection pipe 20 connected to the drying chamber 10, and the A steam generator 30 connected to the steam injection pipe 20, a gas discharge pipe 40 connected to the drying chamber 10, and a load sensor 50 installed in the drying chamber 10; and a discharge pump 60 connected to the gas discharge pipe 40 .

The drying chamber 10 is formed in a hollow cylindrical shape and is provided with a plurality of legs 11 on its lower surface to be supported on the ground, and serves to accommodate the wood W in a sealed state. The leg 11 serves to support the drying chamber 10 on the ground and at the same time provide a place where the load sensor 50 is installed. The drying chamber 10 having such a structure may be provided not only as a cylindrical shape as shown in the figure, but also as a cube having various shapes capable of accommodating wood.

The steam injection pipe 20 is connected to one side of the drying chamber 10 and has a first on/off valve 21 on the pipe line, and the steam generated by the steam generator 30 is transferred to the drying chamber 10 . ) serves to provide a passageway for injection into the interior. The first opening/closing valve 21 is a valve that opens or closes the pipe line of the steam injection pipe 20 as needed, that is, according to the supply of steam or the stop of the steam supply, and through the steam injection pipe 20 . It is a check valve that prevents backflow of steam.

The steam generator 30 is connected to the steam injection pipe 20, and is a known device for heating the water contained therein to make steam, and drying the wood (W) accommodated in the drying chamber 10 with steam. It corresponds to the heating source supplied to

The steam generated by the steam generator 30 is naturally introduced into the drying chamber 10 through the steam injection pipe 20 without a separate conveying means due to its own fluidity.

That is, the steam supplied to the inside of the drying chamber 10 through the steam generator 30 becomes superheated steam by the continuous supply, and accordingly, the high pressure and high temperature inside the drying chamber 10 are changed. It becomes possible to heat the wood (W).

At this time, the temperature and pressure inside the drying chamber 10 are measured by the thermometer T and the pressure gauge P installed in the drying chamber 10 and recognized by the operator.

The gas discharge pipe 40 is connected to the other side of the drying chamber 10 and has a second opening/closing valve 41 on the pipe line, so that the gas inside the drying chamber 10 can be discharged to the outside. .

The second opening/closing valve 41 is a valve that opens or closes the pipeline of the gas discharge pipe 40 as needed, that is, according to the discharge of gas or the stop of the discharge of gas. In addition, the second opening/closing valve 41 induces a drop or rise in pressure by steam into the drying chamber 10 through the discharge or stop of the gas, thereby lowering or increasing the temperature inside the drying chamber 10 . It also plays a role in regulating the rise.

The load sensor 50 is installed on the leg 11 and serves to measure the weight of the wood (W) accommodated in the drying chamber (10) as a known load cell for measuring the weight. More specifically, the load sensor 50 measures the total weight of the drying chamber 10 before the wood W is mounted and the total weight of the drying chamber 10 after the wood W is mounted. This is to measure the weight of the wood (W) mounted in the drying chamber (10) or to measure the weight of the wood (W) after being dried.

As described above, through the load sensor 50 capable of measuring the weight of the wood W, it is possible to recognize the moisture content of the worker after drying the wood W, and accordingly, the load sensor 50 measures Through the increased weight, the operator can easily control the wood W to have a specific moisture content, and accordingly, the production of wood having a specific moisture content is easily made through drying and high heat treatment through the device.

The discharge pump 60 is installed at the end of the gas discharge pipe 40, sucks the air inside the drying chamber 10 through the gas discharge pipe 40, and out through the external discharge pipe 61 to force it out.

The recirculation connection pipe 62 installed in the discharge pump 60 is installed between the discharge pump 60 and the steam generator 30 , and is introduced into the discharge pump 60 through the gas discharge pipe 40 . By introducing the high-temperature and high-pressure gas into the steam generator 30, it is possible to generate steam in a state in which energy is saved.

2 is a step diagram showing a wood drying and high heat treatment method according to the present invention. As shown in FIG. 2 with reference to FIG. 1, the wood drying and high heat treatment method for manufacturing high-strength wood according to the present invention includes a wood sorting step (S1) of sorting wood, and measuring the load of the drying chamber before loading the wood The initial load measurement step (S2), the mounted load measurement step (S3) of mounting the selected wood in the drying chamber and measuring the load of the drying chamber, and the load of the wood mounted in the drying chamber by the load calculation The wood load calculation step (S4) to calculate, the vacuum forming step (S5) of forming a vacuum in the drying chamber, the wood preheating step (S6) of preheating the wood in the drying chamber, and overheating in the drying chamber Superheated steam high heat treatment step (S7) of drying and high heat treatment of wood by injecting steam, and calculating and maintaining water content by measuring the load of wood inside the drying chamber to calculate and maintain water content (S8), and A temperature lowering step (S9) of lowering the internal temperature of the drying chamber to a certain range, a pressure lowering step (S10) of lowering the internal pressure of the drying chamber, and natural aging while naturally cooling the wood in the drying chamber It includes a cooling and aging step (S11), and these steps are sequentially performed to dry and heat the wood.

As described above, in the wood drying and high heat treatment method according to the present invention, a drying chamber for accommodating wood, a steam injection pipe connected to the drying chamber, a steam generator connected to the steam injection pipe, and the drying chamber are connected Wood drying and A high heat treatment device is used.

The wood selection step (S1) refers to a step of selecting and preparing wood that has a moisture content between 20 and 25% and has the same size. This step is to select wood having the same size and moisture content in a specific range so that the initial moisture content of the raw wood can be recognized, and after drying and heat treatment, to produce wood with a constant moisture content and uniform strength. will be.

The initial load measurement step (S2) refers to a step of measuring the load of the drying chamber in an empty state because no wood is mounted with the load sensor. This step is to measure the load of the drying chamber itself in which the wood is not mounted, so that it can be used as data for calculating the load of the wood later.

The loading measurement step (S3) refers to a step of mounting the selected wood in the drying chamber and measuring the load of the drying chamber on which the wood is mounted with the load sensor. In this step, the load of the drying chamber itself is measured in a state where the wood is mounted so that it can be used as data for calculating the load of the wood later.

The wood load calculation step (S4) calculates the load of the drying chamber measured in the initial load measurement step (S2) and the drying chamber load measured in the payload measurement step (S3), and the load before drying of the mounted wood steps to calculate This step serves to calculate and derive the net load of the wood loaded in the drying chamber, and the initial load of the wood derived here is used as reference data for measuring the change in moisture content.

The vacuum forming step (S5) is a step of sealing the drying chamber, operating the discharge pump, sucking air inside the drying chamber through the gas discharge pipe, and discharging it to the outside through the external discharge pipe to form a vacuum state say This step serves to remove foreign substances remaining in the air inside the drying chamber while creating an environment in which the moisture contained in the wood can be quickly discharged by forming a degree of vacuum inside the drying chamber. These residual foreign substances adhere to the outer surface of the wood during drying and heat treatment of the wood, and may cause defects in the wood itself.

In the wood preheating step (S6), after a vacuum is formed in the drying chamber, the steam generator is operated to inject steam into the drying chamber through the steam injection pipe to increase the temperature inside the drying chamber at room temperature in degrees Celsius. It refers to the step of raising to 100 degrees and preheating the wood accommodated in the drying chamber.

In this step, the temperature of the wood is gradually raised before the wood is subjected to high heat treatment to prevent splitting or distortion of the wood due to the rapid temperature rise, and the inside of the drying chamber is filled with water vapor to block the inflow of oxygen from the outside. This is to minimize the splitting heat caused by high temperature during high heat treatment by steaming the wood (steam with steam).

In the superheated steam high heat treatment step (S7), the steam generator is operated to inject superheated steam into the drying chamber through the steam injection pipe, and the temperature inside the drying chamber is 140 degrees Celsius to 170 degrees Celsius for 2 hours. It refers to the step of drying and high heat treatment by heating the wood accommodated in the drying chamber while maintaining for 4 hours. This step serves to produce high-strength wood by drying and high heat treatment through superheated steam at a specific temperature and time.

Here, the superheated steam is formed by heating the steam to a high temperature of 100 degrees Celsius or more, so that the wood can be dried and heat treated at a high temperature of 100 degrees Celsius or more.

The superheated steam high heat treatment step (S7) is performed by operating the discharge pump, from the steam generator to the steam injection pipe through the recirculation connection pipe, from the steam injection pipe to the inside of the drying chamber, and from the drying chamber to the gas discharge pipe. A superheated steam circulation process for saving energy by circulating the superheated steam injected into the drying chamber by circulating the internal air with the discharge pump, and high heat treatment of wood inside the drying chamber while the superheated steam is circulated. It further includes a wood vinegar extraction process of extracting the generated wood vinegar to the outside of the drying chamber.

The superheated steam circulation process circulates the superheated steam generated by the steam generator and injects it back into the steam generator, thereby reducing energy required for generating the superheated steam. The wood vinegar extraction process is to extract wood vinegar generated during high heat treatment of wood so that it can be reused as a coolant and disinfectant for wood in a later process.

In the water content calculation and maintenance step (S8), the total weight of the drying chamber is measured through the load sensor while the wood is heated to derive the weight after drying of the wood, and the weight before drying and the weight after drying of the wood It refers to the step of maintaining high heat treatment until the moisture content of the wood reaches the target moisture content through the calculation by comparing the moisture content of the wood.

This step serves to maintain the moisture content of the wood to a specific value, for example, between 5 and 10%, through the calculation of the moisture content, and the lower the moisture content at the moisture content of 5 to 10%, the lower the strength of the wood. The higher the moisture content, the higher the toughness (toughness) of the wood. The moisture content of such high heat-treated wood is determined by the user's need or choice.

In the temperature lowering step (S9), after the high heat treatment of the wood is completed, the steam generator is stopped and the discharge pump is operated to pass from the steam generator to the steam injection pipe through the recirculation connection pipe from the steam injection pipe to the inside of the drying chamber. By circulating internal air from the gas discharge pipe to the discharge pump from the drying chamber to the gas discharge pipe, lowering the temperature of the wood while lowering the temperature inside the drying chamber to 80 to 100 degrees Celsius.

In this step, in a state in which the supply of superheated steam by the steam generator is stopped, the internal air of the drying chamber is circulated, and the internal temperature of the drying chamber by injection and circulation of the internal air (150 to 170 degrees Celsius after high heat treatment) It serves to prevent splitting or damage to wood due to sudden temperature drop by gradually lowering the temperature to 100 degrees Celsius or less.

In the temperature lowering step (S9), the wood vinegar extracted in the wood vinegar extraction process is injected through the external discharge pipe, and the wood vinegar is circulated by evaporation together with the internal air inside the drying chamber and applied to the wood. The process of applying and cooling wood vinegar to cool, and installing a filter in the conduit of the recirculation connection pipe to the outside of the drying chamber so that the wood vinegar and foreign substances contained in the internal air are forcibly circulated by the discharge pump. It further includes a process of removing foreign substances by filtering.

The wood vinegar application and cooling process is to inject wood vinegar into the drying chamber to cool the drying chamber and the wood, while the wood vinegar is applied to the outer surface of the wood to have sterilization through the wood vinegar. Here, the wood vinegar has a sterilization and disinfection function, and serves to prevent deterioration of the lifespan due to decay of the wood while being applied to the outer surface of the wood.

The foreign matter removal process removes foreign substances contained in the wood vinegar and the internal air by filtering, so that foreign substances such as oil or carbide do not adhere to the outer surface of the wood, thereby improving the quality of wood produced after high heat treatment.

In the pressure lowering step (S10), after the temperature drop is completed, the steam generator is operated to inject steam into the inside of the drying chamber through the steam injection pipe, and the air inside the drying chamber through the external discharge pipe. It refers to the step of lowering the internal pressure of the drying chamber to atmospheric pressure by intermittently discharging over 2 to 3 hours. In this step, the pressure inside the drying chamber is gradually lowered to prevent splitting or damage to the wood caused by a sudden pressure drop or change.

In the natural cooling and aging step (S11), after the pressure drop is completed, the inside of the drying chamber is kept sealed for 2 to 4 days, and the temperature of the drying chamber is naturally lowered to room temperature while aging the wood. say step.

In this step, the temperature of the wood is gradually lowered to room temperature to prevent splitting of the wood due to a sudden temperature change, and by resolving the internal stress remaining in the wood by aging the wood, it is possible to properly adapt even if the wood is exposed to the external environment.

The natural cooling and aging step (S11) further includes a disinfectant application process of spraying a natural disinfectant into the inside of the drying chamber while the drying chamber is closed and applying it to the wood. The disinfectant application process is to apply a natural disinfectant to the outer surface of the wood so that the deterioration of the lifespan due to the decay of the wood can be properly prevented.

Such a natural disinfectant may contain a cypress extract, a lemon extract, a garlic extract, a ginger extract, a ginkgo leaf extract, a S. asiatica leaf extract, a paulownia leaf extract, neem oil, and pine oil.

Although preferred embodiments of the present invention have been described above, various changes, modifications and equivalents may be used in the present invention. It is clear that the present invention can be equally applied by appropriately modifying the above embodiments. Accordingly, the above description is not intended to limit the scope of the present invention, which is defined by the limits of the following claims.

On the other hand, although specific embodiments have been described in the detailed description of the present invention, it will be apparent to those skilled in the art that various modifications are possible without departing from the scope of the present invention.

10: drying chamber
11: Legs
20: steam injection pipe
21: first on-off valve
30: steam generator
40: gas discharge pipe
41: second on-off valve
50: load sensor
60: discharge pump
61: external discharge pipe 62: recirculation connection pipe

Claims (4)

A drying chamber for accommodating wood, a steam injection pipe connected to the drying chamber, a steam generator connected to the steam injection pipe, a gas discharge pipe connected to the drying chamber, and a load sensor installed in the drying chamber; , A method of drying and high heat treatment of wood using a wood drying and high heat treatment apparatus including a discharge pump connected to the gas discharge pipe and provided with an external discharge pipe connected to the outside and a recirculation connection pipe connected to the steam generator. in;
A wood sorting step (S1) of selecting and preparing wood that has a moisture content between 20 and 25% and has the same size;
an initial load measurement step (S2) of measuring the load of the drying chamber in an empty state by not mounting wood with the load sensor;
a mounted load measuring step (S3) of loading the selected wood in the drying chamber and measuring the load of the drying chamber on which the wood is mounted with the load sensor;
a wood load calculation step (S4) of calculating the load before drying of the mounted wood by calculating the load of the drying chamber measured in the initial load measurement step and the drying chamber load measured in the payload measurement step (S4);
a vacuum forming step (S5) of sealing the drying chamber, operating the discharge pump, sucking air inside the drying chamber through the gas discharge pipe, and discharging it to the outside through the external discharge pipe (S5);
After a vacuum is formed in the drying chamber, the steam generator is operated to inject steam into the drying chamber through the steam injection pipe to raise the temperature inside the drying chamber from room temperature to 100 degrees Celsius, and the drying chamber A wood preheating step (S6) of preheating the wood accommodated in the interior of the;
By operating the steam generator and injecting superheated steam into the inside of the drying chamber through the steam injection pipe, the temperature inside the drying chamber is maintained at 140°C to 170°C for 2 hours to 4 hours while the drying chamber A superheated steam high heat treatment step (S7) of heating the wood accommodated therein, drying and high heat treatment;
While heating the wood, the total weight of the drying chamber is measured through the load sensor to derive the weight after drying of the wood, and the weight before drying and the weight after drying of the wood are compared to determine the change in the moisture content of the wood. a moisture content calculation and maintenance step (S8) of calculating and maintaining high heat treatment until the moisture content of the wood reaches a target moisture content through the calculation;
After the high heat treatment of the wood is completed, the steam generator is stopped and the discharge pump is operated to pass from the steam generator to the steam injection pipe through the recirculation connection pipe. a temperature lowering step (S9) of lowering the temperature of the wood while lowering the temperature inside the drying chamber to 80 to 100 degrees Celsius by circulating the internal air from the gas discharge pipe to the discharge pump;
After the temperature drop is completed, the steam generator is operated to inject steam into the interior of the drying chamber through the steam injection pipe, and the air inside the drying chamber is intermittently supplied through the external discharge pipe over 2 to 3 hours. a pressure lowering step (S10) of lowering the internal pressure of the drying chamber to atmospheric pressure by discharging to the air;
A natural cooling and aging step (S11) of aging the wood while naturally lowering the temperature of the drying chamber to room temperature by maintaining the inside of the drying chamber in a sealed state for 2 to 4 days after the pressure drop is completed;
Wood drying and high heat treatment method for manufacturing high strength wood, characterized in that it comprises.
According to claim 1,
The superheated steam high heat treatment step (S7),
By operating the discharge pump, from the steam generator to the steam injection pipe through the recirculation connection pipe, from the steam injection pipe to the inside of the drying chamber, from the drying chamber to the gas discharge pipe, from the gas discharge pipe to the discharge pump. A superheated steam circulation process for saving energy by circulating the superheated steam injected into the drying chamber;
A wood vinegar extraction process of extracting wood vinegar generated by high heat treatment of wood from the inside of the drying chamber while the superheated steam is circulated to the outside of the drying chamber,
Wood drying and high heat treatment method for manufacturing high-strength wood, characterized in that it further comprises.
3. The method of claim 2,
The temperature lowering step (S9) is,
The wood vinegar extracted in the wood vinegar extraction process is injected through the external discharge pipe, the wood vinegar liquid is circulated by evaporation together with the internal air inside the drying chamber, and the wood vinegar application and cooling process for cooling the wood while being applied to the wood;
A process of removing foreign substances by filtering and removing foreign substances contained in the wood vinegar and the internal air while the internal air and the wood vinegar are forcibly circulated by the discharge pump by installing a filter in the conduit of the recirculation connection pipe to the outside of the drying chamber,
Wood drying and high heat treatment method for manufacturing high-strength wood, characterized in that it further comprises.
According to claim 1,
The natural cooling and aging step (S11),
A disinfectant application process of spraying a natural disinfectant into the inside of the drying chamber while the drying chamber is closed and applying it to the wood, further comprising,
The natural disinfectant is
Wood drying and high heat treatment method for manufacturing high-strength wood, characterized in that it contains cypress extract, lemon extract, garlic extract, ginger extract, ginkgo leaf extract, Smilax china L. leaf extract, paulownia leaf extract, neem oil, and pine oil .

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