JP4580451B2 - Hard wood processing equipment - Google Patents

Description

  The present invention relates to a hard wood processing apparatus capable of processing even soft wood into hard wood with increased bending strength by steam pressure treatment.

Since wood coexists with elasticity and viscosity, it is softened with water vapor using a high-temperature and high-pressure press molding device, then compressed and deformed, and then compression-molded to fix its shape by high-pressure steam treatment again. Has been done.
For example, in a wood processing method and apparatus shown in Japanese Patent Application Laid-Open No. 5-50409, a high-temperature and high-pressure vessel in which high-temperature, high-pressure steam and high-frequency are supplied, and a press die is appropriately placed in the high-temperature and high-pressure vessel. And a press machine for compressing and molding wood by driving at least one of the press dies arranged opposite to each other by an appropriate means. The wood is rapidly heated and softened by steam and high frequency in a high-temperature and high-pressure vessel. After that, a configuration in which it is fixed by compression molding with a press machine is disclosed.
However, in fast-growing cedar and bamboo thinning in high-temperature areas such as Okinawa, Kyushu and other western Japan regions, the core spacing is wide, so the material is soft and weak in strength. The compression molding process could not be cured sufficiently and could not be used as a wooden construction material.
JP-A-5-50409

This invention was invented in view of the above circumstances, and its main problem is
An object of the present invention is to provide a hard wood processing apparatus capable of processing a log made of soft wood into a wood having high bending strength by compressing and deforming the log by steam pressurization.

In order to solve the problem, the invention of claim 1
In hard wood processing equipment that pressurizes wood while steaming with steam and pressurizing equipment,
The steam / pressurizer has a high-temperature steam supply means for supplying high-temperature steam into the housing of the steam / pressurizer, and a rolling press device for clamping a cylindrical log having the same diameter in the housing. And
The rolling press is
A pair of upper and lower pressure plates provided in the housing;
A pressurizing means for adjusting the vertical distance between the pair of upper and lower pressure plates to sandwich a cylindrical log of the same diameter;
A moving means for rotating the log by moving the pair of upper and lower pressure plates in the opposite directions while maintaining parallelity in a state where the log is sandwiched,
An air cooling means for returning the inside of the housing to room temperature is provided.
In the invention of claim 2,
A low-temperature steam means for supplying low-temperature steam to the housing of the steam / pressurizer is provided, steamed with high-temperature steam and returned to normal temperature, and then steamed with low-temperature steam. To do.
In the invention of claim 3,
It comprises a low-temperature steam device for supplying low-temperature steam separately from the steam / pressurizer.
Furthermore, in the invention of claim 4,
In the hard wood processing equipment that pressurizes wood while steaming with steam and pressurizing equipment,
A steam / pressurizer is a high-temperature steam / pressurizer supplying means for supplying high-temperature steam and pressurization into a housing of the steam / pressurizer, and a plurality of double bottles for storing cylindrical logs in the housing It has a single pipe and air cooling means for returning the inside of the housing to room temperature,
The single double pipe has a structure in which an outer pipe made of stainless steel plate is fitted to an inner pipe made of stainless steel mesh, and the radial distance between the inner pipe and the processing log is set to be less than about 5 cm. It is characterized by being.

In the present invention, even if the material is soft and weak in strength, uniform compression deformation and solidification can be simultaneously performed over the entire outer periphery, and the hardness and strength of the wood can be increased.
This means that the polysaccharides made of protein are stiffened by compressing with heat and pressure by tightening the wood between the woods while steaming, and increasing the strength against bending by narrowing the space between the woods Can do.
Moreover, if steaming is performed twice by low-temperature steam treatment in addition to high-temperature steam treatment, it is possible to realize a more reliable hard processing that does not cause a return even with extremely soft wood.

In this invention, the steam / pressurizing device for wood increases the hardness and strength of soft wood by uniformly compressing and deforming the log by rotating the log while applying high temperature steam treatment to the log and pressing it with the upper and lower pressure plates. The purpose was realized.
Hereinafter, embodiments of the hard wood processing apparatus of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the hard wood processing apparatus 1 of the present embodiment includes cutting / cutting machines 11, 12, a steam / pressurizing apparatus 2, and a single plate manufacturing machine 21.

[Cutting and cutting equipment]
A raw tree of cedar (may be cocoon) produced in West Japan is cut into a standard size by a cutting machine 11.
The cut raw wood is cut and aligned by the cutting machine 12 so as to form a cylindrical log having the same diameter in the vertical direction.

[Steam / Pressurizer]
As shown in FIG. 2, the steam / pressurizer 2 includes a steam pipe 3 as a high-temperature steam supply means for spraying high-temperature steam in a housing 10 having a hatch, a boiler device 7 connected thereto, and a housing 10. It has a rolling press device 4 that pressurizes the log while rolling, a pressure adjusting valve 5 that adjusts the pressure in the housing 10, and an automatic control panel 6 that controls these.

[Steam tube]
The steam pipe 3 is a pipe having a large number of spray holes. In the illustrated example, the steam pipe 3 is disposed below the housing 10 and is connected to a separate boiler device 7.
The water vapor supplied from the boiler device 7 can be sprayed into the housing 10.

[Rolling press machine]
As shown in FIGS. 3A to 3C, the rolling press device 4 includes a plurality of sets of plate-like pressure plates 4 a and 4 b that are provided in multiple stages and are paired up and down.
The pair of pressure plates 4a and 4b are configured such that the upper and lower pressure plates 4a and 4b are narrowed by the pressurizing means 41 so that the vertical space between the upper and lower pressure plates 4a and 4b is reduced. The pressure plate 4b moves in the opposite direction.

In the present embodiment, as an example, the pressurizing means 41 includes a cylinder that pushes down the upper pressure platen 4a toward the lower pressure platen 4b.
As an example of the advancing / retreating means 45, the upper pressure platen 4a connects the base end of the cylinder 41 to a runner (slider) 46, extends horizontally and extends along an upper guide rail 47 fixed in the housing. The lower-side pressure platen 4b connects the base end of the arm 42 connected to the runner 48 to the runner 48 and extends horizontally to be fixed in the housing. The runner 48 is moved back and forth in the direction opposite to the runner 46 of the upper guide rail 47 along the lower guide rail 49.

The surface of the pair of pressure plates 4a and 4b, that is, the contact surface with the log, is such that the log W is sandwiched between the upper and lower pressure plates 4a and 4b, and the upper and lower pressure plates 4a and 4b are parallel to the opposite directions. When moving, the surface of the pressure plate is not shown in the figure, but has an uneven surface structure with a groove having a width of 1 to 2 mm, so that the log W rolls in parallel with the surface in contact with the pressure plates 4a and 4b. It has become.
The uneven surface is a known shape for applying a frictional force that can rotate into a log, such as a shape in which grooves are formed on a flat surface, or a shape in which a large number of small circles or convex portions having an arbitrary geometric shape are provided at equal intervals. Shapes can be used.

Then, a cut log W is inserted between the upper pressure platen 4a and the lower pressure platen 4b, and the upper pressure platen 4a is lowered by the pressurizing means 41 so that the log W is sandwiched together with the lower pressure platen 4b. The log W is clamped by the force (see FIG. 3A).
Next, when the upper pressure platen 4a and the lower pressure platen 4b move horizontally in the left-right reverse direction, the log W is rotated by the torque generated by the frictional force (see FIGS. 3B and 3C).

Since the log W is tightened and compressed by the rotation, the log W is rotated and compressed while applying a larger applied pressure to the log W by the pressurizing means 41.
By repeating forward and reverse rotation of the log W, the entire outer peripheral surface except for the end face is compressed by being uniformly clamped by the upper and lower compression discs 4a and 4b.

[Pressure adjustment valve]
The pressure adjusting valve 5 is a safety valve for adjusting the pressure in the housing 10 so that the standard atmospheric pressure is maintained when water vapor is supplied from the steam pipe 3 into the housing 10.

[Boiler equipment]
The boiler device 7 is a heat source device that transfers heat obtained by burning the fuel to water, converts it into water vapor, and supplies it to the steam pipe 3. In the illustrated example, the boiler device 7 is provided separately from the compression device 2. 2 may be provided integrally.

[Exhaust section]
The exhaust unit 8 is an example of an air cooling unit that discharges water vapor supplied from the boiler device 7 into the housing 10 and introduces outside air to ventilate the housing 10 to room temperature. A window that can be opened and closed or the hatch may be used, or a forced exhaust may be provided by providing a fan.

[Automatic control panel]
The automatic control panel 9 has a computer configuration and a processing unit 9a for automatically controlling the steam pipe 3, the boiler device 7 and the rolling press device 4 according to the usage described later, and an operation panel provided with an external operating state. It has a monitor 9b for displaying, a recording device 9c for recording operation data and history, and an operation switch 9d.

[Single plate manufacturing machine]
The veneer manufacturing machine 21 is a device that peels off the log W processed by the steam / pressurizing device 2 with a cutter and manufactures it into a square bar or a veneer.
The square material cut from the log W can be selected in two ways.
The first is a “core mochi” with the core of a log centered on a log core, and only one square or single plate can be taken from one log.

The second is a “scraper” that takes multiple pieces from the log W. The wood grain is semicircular, diagonally vertically aligned, vertically aligned horizontally, etc. Can be taken.
In addition, square or single plate can be set to any thickness depending on the application, and in the case of a plate used for flooring material, the thickness can be set to be thinner, depending on the type and use of wood. It can be a dimension.

[how to use]
Below, the usage method of the hard wood processing apparatus 1 is demonstrated (refer FIG. 4).
A soft material such as cedar or oak is cut with a cutting machine 11 at intervals of, for example, 20,000 mm.
Next, the cut raw tree is made with a cutting machine 12 so as to obtain a log W having the same diameter and the same shape as a cylinder having the same upper and lower diameters.

The log W is carried into the housing 10 of the steam / pressurizer 2.
That is, the logs W are sandwiched between the pair of upper and lower pressure plates 4a and 4b provided in the rolling press device 4 in the housing 10 so as to be almost evenly arranged.
Here, the upper and lower pressure plates 4a and 4b form a parallel surface, and the logs W arranged between them have the same diameter.

High temperature steam is supplied from the boiler device 7 through the steam pipe 3 into the housing 10 to steam the logs.
Here, as a guideline for setting conditions of the high temperature steam, it is as follows.
When the diameter of the log is 100 mm or more and 200 mm or less, the set temperature is 110 ° C. and the drying process time is about 2 hours.
When the log has a diameter of 201 mm or more and 400 mm or less, the set temperature is 115 ° C. and the drying process time is about 3 hours.
When the log has a diameter of 401 mm or more and 600 mm or less, the set temperature is 120 ° C. and the drying process time is about 4 hours.
When the log has a diameter of 601 mm or more, the set temperature is 130 ° C. and the drying process time is about 5 hours.

Next, the rolling press device 4 is operated, and the upper and lower pressure plates 4a and 4b are sandwiched by applying a certain pressure with a narrower vertical distance (see FIG. 3A). The pressure plates 4a and 4b slowly move forward and backward so that they are in opposite directions.
That is, when the upper pressure plate 4a moves to the left, the lower pressure plate 4b moves to the right (see FIG. 3B), and when the upper pressure plate 4a moves to the right, the lower pressure plate 4b moves to the left ( (Refer FIG.3 (c)).
As a result, the rolling force is transmitted to the log W sandwiched between the upper and lower pressure plates 4a and 4b, and at the same time, the interval between the upper and lower pressure plates 4a and 4b is narrowed to gradually tighten the log W.

  As the log W is steamed in this way, a uniform pressing force acts on the entire outer surface of the log and gradually tightens to apply a predetermined pressure, so that the log W's annual rings (wood grain) and annual rings (wood grain) The strength of the log W can be increased by stiffening the saccharified cellulose composed of the protein in between by compressing with heat and pressure and narrowing the interval between the grains.

Here, the standard of the setting condition of the pressure applied to the log is as follows.
When the diameter of the log is not less than 100 mm and not more than 200 mm, the set pressure is 0 to 10 Pa, and the pressurizing treatment time is about 2 hours which is the same as the drying treatment time.
When the log has a diameter of 201 mm or more and 400 mm or less, the set pressure is 20 Pa, and the pressurization processing time is about 3 hours which is the same as the drying processing time.
When the log has a diameter of 401 mm or more and 600 mm or less, the set pressure is 30 Pa, and the pressurization processing time is about 4 hours which is the same as the drying processing time.
When the diameter of the log is 601 mm or more, the set pressure is 30 to 50 Pa, and the pressurizing treatment time is about 5 hours which is the same as the drying treatment time.
Here, the set pressure is gradually increased from 0, and the pressure is gradually increased at an equal rate in the drying process time so that the set pressure becomes the MAX value near the end of the process time. Set to

Thereafter, the temperature in the housing 10 is gradually returned to room temperature.
Then, since the upper and lower pressure plates 4a and 4b that have rubbed the log W are widened and the tightening of the logs W is loosened, the processed log W is extracted from the upper and lower pressure plates 4a and 4b, not shown. It is transported out of the housing 10 on a carriage.

After the temperature of the log W is lowered to about 40 to 60 ° C., the hatch of the housing 20 is opened, and the log W is lowered from the carriage and transferred to the veneer manufacturing machine 21.
The log W is easily processed into a single plate by the cutter of the single plate manufacturing machine 21.
Thereby, the single board for plywood of an omnidirectional cooperation earthquake-resistant structure is obtained.

[Strength comparison measurement value table]
Regarding cedar logs, the Young's modulus (bending) of the logs before and after the processing using the FFT analyzer is as follows.
The test materials are South Tohoku (Shiraishi) cedar logs (diameter: 500 mm, length: 2000 mm).
[Young's modulus table (tf ⁷ / cm ² )]
Test log cedar 1 Before pressure treatment 52.91 After pressure treatment 78.15
Test log cedar 2 45.54 before pressure treatment 75.29 after pressure treatment
Test log cedar wood 3 47.63 before pressure treatment 76.37 after pressure treatment
Test log cedar 4 Before pressure treatment 51.48 After pressure treatment 78.23
Test log cedar 5 Before pressure treatment 49.23 After pressure treatment 76.86
Average value before pressure treatment 49.358 Average value after pressure treatment 76.98
As a result, even soft cedar wood was confirmed to be harder than 75, which is the upper limit of the average bending Young's modulus of general cedars by the Timber Directory (National Timber Federation). .

  In the above embodiment, the log W processed by the steam / pressurizing device 2 is exemplified as a square bar or a single plate by the single plate manufacturing machine 21, but in the meantime, it is put in the low temperature steam (vacuum steam) device 20. Example 2 of the hard wood processing apparatus 1 to which the step of steaming twice is added (see FIGS. 5 and 6) is shown.

[Low temperature steam equipment]
In this embodiment, the low-temperature steam (vacuum steam) device 20 is a device that steams the log at a low temperature (40 to 95 ° C.) in a vacuum state, and is used for twice steaming the log W.
The low-temperature steam device 20 may be provided in the housing 10 to steam the logs sandwiched between the pressure plates with low-temperature steam, or may be provided externally. Good.

[how to use]
In Example 2, as shown in FIG. 6, the rolling press device 4 is operated, the log W is steamed with high-temperature steam, and the log W is pressurized with the upper and lower pressure plates 4a and 4b until compressed. is there.
Thereafter, the temperature in the housing 10 is gradually returned to room temperature.
The treated log W is once returned to room temperature, and then placed in a low-temperature steam (vacuum steam) apparatus 20 and steamed at a low temperature (40 to 95 ° C.).

By steaming the log W twice at a high temperature and a low temperature in this way, the diameter of the log W previously fastened at the high temperature is steamed with the low temperature steam, so that it is prevented from returning to the original diameter. It becomes easy to cut the plate.
The log W is processed into a single plate by the cutter of the single plate manufacturing machine 21 and processed in the same manner as in the first embodiment.
The logs obtained in Example 2 were measured for the Young's modulus (bending) of the logs before and after the processing using the FFT analyzer, and the same results as in Example 1 were obtained. It was confirmed that the cedar was harder than 75, which is the upper limit of the average value of bending Young's modulus.

The characteristics of the plywood as an applied product using the veneer obtained in Examples 1 and 2 are as follows.
(1) “Inner / outer wall materials” Bending, pulling, and strength are increased, and there is no error caused by warping. In addition, the density becomes thicker and the heat insulation results increase and it becomes a heat insulating material.
(2) “Ceiling board” Bending and tensile strength is increased, and the ceiling board is free from distorting due to warping.
(3) “Flooring material” The surface is hard, and even if a few things are dropped, they are not easily damaged.
(4) “Glulam” Pillar / Beam / Girder / (Piano Wire Column / Beam / etc.>
(5) “Furniture / Furniture Materials” Reinforced materials that are less prone to warping

  As shown in the above example, cedars and straws in high-temperature areas such as Okinawa and Kyushu are softer as they grow faster, depending on the production area (nurturing place) of the tree species, and the wood quality is softer than necessary compared to Honshu timber. In particular, there is a large difference in bending strength and it is difficult to use as a building material for houses, but with the above structure, the bending strength is greatly increased by narrowing the space between the annual rings (grains) and the annual rings (real eyes) and increasing the density of wood. It was confirmed that the improvement was aimed at.

Moreover, an omnidirectional strong earthquake-resistant structural plywood can be manufactured by superimposing five single plates obtained as described above.
That is, the above-mentioned plywood uses the above-mentioned single board of the vertical wood for the first layer, uses the above-mentioned single board of the diagonal wood inclined 45 degrees to the right for the second layer, and uses the above-mentioned single board for the horizontal wood for the third layer The fourth layer is composed of the single plate having a slanted grain inclined 45 degrees to the left and the fifth layer using the single plate having a vertical grain.
Then, a bond is applied as an example of an adhesive to each of the five layers of the single plate, the number of plywoods is stacked in accordance with the capacity of the pressure device, and a pressure of about 30 Pa is applied until the bond is dried. By applying to, omnidirectional strong earthquake resistant structure plywood is obtained.

In the above-described embodiment, the case where a rolling press device is used as the steam / pressurizing device 2 is illustrated, but a steam / pressurized vacuum kiln 50 having a single double tube 51 may be used.
As shown in FIG. 7, the steam / pressurized vacuum kiln 50 has a substantially cylindrical shape, and a plurality of (nine in the illustrated example) double-units are held inside by a support means 55 at substantially equal intervals. A tube 51 is built in.

As shown in FIG. 8, the double saddle single pipe 51 has a configuration in which an outer pipe 53 made of a stainless steel plate is fitted on the outer side of an inner pipe 52 of a cylinder (soot pipe) made of stainless steel mesh.
As will be described later, the length of the space L between the double rod single pipe 51 and the log W ′ housed therein is important.
That is, the log W ′ for processing (stored in the present embodiment may be a raw cedar log or a plate material with a log peeled off) accommodated in the single double pipe 51 (inner pipe 52) has a diameter of about 30 cm, When the length is about 4 m or less, the diameter of the opening of the double saddle tube 51 needs to be set within 35 cm in view of the margin of the log W ′.

  As shown in FIG. 9, the steam / pressurized vacuum kiln 50 includes a steam pipe 63 as a high-temperature steam supply means for spraying high-temperature steam into a housing 50 </ b> A having a hatch H, a boiler device 67 connected to the steam pipe 63, and pressurization A pressure pipe air nozzle 62 as a supply means, a carriage 60 on which the double rod single pipe 51 is placed, a carriage traveling rail 61, a pressure adjusting valve 65 for adjusting the pressure in the housing 50A, and these And an automatic control panel 69 for controlling.

Here, the rising temperature in the steam / pressurized vacuum kiln 50 by the steam from the steam pipe 63 by the boiler device 67 is set to 120 ° C. at a maximum.
Similarly, the pressurization by the air nozzle 62 for the pressurization pipe is set to 30 atm at the maximum.

The steam / pressurized vacuum kiln 50 is used by inserting a cedar log W ′ into an inner pipe 52 of a single double pipe 51.
After the insertion, the hatch H is closed and the steam / pressurized vacuum kiln 50 is sealed, steamed with steam from the steam pipe 63 to gradually raise the temperature in the kiln, and at the same time, pressure is applied by the air nozzle 62.

  In this embodiment, heating and pressurization is performed for about 30 minutes after the steam temperature reaches 100 ° C. or more (can be increased or decreased depending on the wood quality), and after completion, the temperature in the kiln reaches a safe temperature (burn prevention temperature). After the lowering, the hatch H is opened, the cart 60 is taken out, and the log W ′ that has been subjected to the curing process is taken out from the single double tube 51.

By the above treatment, the cell made of cellulose is crushed between the wood rings of the annual rings on the inner surface of the cedar log W 'which is gradually pressurized while being steamed, and the space between the annual rings and the annual rings is narrowed and hardened. Is done.
The logs obtained in Example 3 were measured for the Young's modulus (bending) of the logs before and after the processing using the FFT analyzer, and the same results as in Examples 1 and 2 were obtained. It was confirmed that the cedar was harder than 75, which is the upper limit of the average value of bending Young's modulus of general cedar.

  In addition, the log W ′ that has been cured by this process has less knots and unevenness compared to the case of processing in the steam / pressurized vacuum kiln 50 without using the double fired single pipe 51, and the log W ′ There is little bend on the left and right of ', and there is also the effect that the space between the grain is compressed evenly.

However, the above effect is realized by setting the distance L between the cedar logs W ′ and the inner tube 52 to be less than 5 cm, and it is experimentally shown that the above effect cannot be obtained when the distance L is 5 cm or more. confirmed.
FIG. 10 is a block diagram showing the procedure of the hard wood processing of the third embodiment, which is the same as the first embodiment, so that the description of the same configuration is omitted.
In this case, a step of steaming twice as in Example 2 may be added.

In addition, the setting conditions for the processing in each of the above-described embodiments are examples, and the weather conditions in the plantations of cedars and bushes, whether it is a natural environment or a mountain slope, the direction of east, west, north and south, sunshine hours, rainfall, Since there are differences in wood hardness and pigments depending on various conditions such as wind, it is desirable to experimentally adjust to the optimum value accordingly.
In addition, it goes without saying that various design changes can be made without departing from the scope of the present invention.

It is a block diagram which shows the hard wood processing apparatus of Example 1. FIG. It is a schematic diagram which shows the Example of a vapor | steam and a pressurization apparatus. It is a schematic diagram which shows the action | operation of a rolling-type press apparatus, (a) is a figure which shows the state which mounts a log, (b) The figure of the state pressurized while rotating a log, (c) While rotating in the opposite direction It is a figure of the state which pressurizes. It is a flowchart which shows the process of the processing process. It is a block diagram which shows the wood hard processing apparatus of Example 2. FIG. It is a flowchart which shows the process of the processing process. 6 is an explanatory view showing the inside of a steam / pressurized vacuum kiln of Example 3. FIG. It is sectional drawing of a double rod single pipe. It is explanatory drawing seen from the side of the steam and pressure vacuum kiln. 10 is a flowchart illustrating a process of processing according to a third embodiment.

DESCRIPTION OF SYMBOLS 1 Hard wood processing apparatus 2 Steam | pressurization apparatus 3 Steam pipe 4 Rolling type press apparatus 4a, 4b Pressure board 5 Pressure control valve 6 Automatic control panel 7 Boiler apparatus 8 Exhaust part 9 Automatic control panel 9a Processing part 9b Monitor part 9c Recording Device 9d Operation switch 10 Housing 11 Cutting machine 12 Cutting machine 20 Low-temperature steam device 21 Single plate manufacturing machine W, W 'log 50 Steam / pressurized vacuum kiln 51 Double fired single pipe 52 Inner pipe 53 Outer pipe

Claims (4)

In the hard wood processing equipment that pressurizes wood while steaming with steam and pressurizing equipment,
The steam / pressurizer has a high-temperature steam supply means for supplying high-temperature steam into the housing of the steam / pressurizer, and a rolling press device for clamping a cylindrical log having the same diameter in the housing. And
The rolling press is
A pair of upper and lower pressure plates provided in the housing;
A pressurizing means for adjusting the vertical distance between the pair of upper and lower pressure plates to sandwich a cylindrical log of the same diameter;
A moving means for rotating the log by moving the pair of upper and lower pressure plates in the opposite directions while maintaining parallelity in a state where the log is sandwiched,
A hard wood processing apparatus comprising air cooling means for returning the interior of the housing to room temperature.   It is equipped with a low-temperature steam means for supplying low-temperature steam into the housing of the steam / pressurizer, and is characterized by steaming with high-temperature steam and returning the pressurized log to room temperature before steaming with low-temperature steam. The wood hard processing apparatus according to claim 1.   2. The hard wood processing apparatus according to claim 1, further comprising a low-temperature steam device that supplies low-temperature steam separately from the steam / pressurizer. In the hard wood processing equipment that pressurizes wood while steaming with steam and pressurizing equipment,
High temperature steam / pressure supply means for supplying high temperature steam and pressure into the steam / pressurization device housing;
A plurality of double rod single pipes that store cylindrical logs in the housing;
Air cooling means for returning the interior of the housing to room temperature,
The double saddle single pipe has a configuration in which an outer pipe made of a stainless steel plate is fitted to an inner pipe made of a stainless steel mesh,
A hard wood processing apparatus characterized in that a radial distance between an inner tube and a processing log is set to be less than about 5 cm.

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