JP3538194B2 - Production method of noncombustible wood - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to incombustible wood, and more particularly to a method for producing incombustible wood by impregnating wood with an incombustible treatment agent.

[0002]

2. Description of the Related Art Conventionally, timber has been widely used in buildings such as houses from the viewpoint of lightness, grain and good workability. However, the biggest difficulty in using wood as a building material is that it is easy to burn. Therefore, various techniques for making wood fire-resistant have been developed. Along with this, the field of use has become widespread. For example, since the Building Standard Law (Heisei 2) has been revised for door frames, it has become possible to use wood for openings.
For example, the development of flame-retarding technology to pass the flame penetration standards of 60 minutes for class A and 20 minutes for class B is progressing.

[0003] As an example of a method of flame retarding technology currently in use, there is a method of impregnating wood with a flame retardant such as a water-soluble inorganic compound such as boric acid or borax. The impregnation method for the flame retardant is to impregnate and impregnate (impregnate) or pressurize to impregnate (impregnate) (for example, as shown in FIG. In the impregnation step → drying step), the wood structure can be physically impregnated with chemicals such as borax and boric acid, and the treatment process is not complicated, so that it is used relatively frequently.

In this treatment, for example, first, wood is dried to a certain moisture content. Thereafter, the pressure is reduced and deaerated, and the incombustible agent is infiltrated as it is, and further pressurized and infiltrated. After that, it is dried and the wood structure is fixedly impregnated with the incombustible liquid. By such a process, flame-retardant wood is produced. On the other hand, it is necessary to clear the standard of the incombustibility test (heating rate test ISO5660) as a condition of the incombustible material (incombustible wood) and the incombustible material (incombustible wood) in the current building standard law. The criteria are shown in Table 1.

According to this standard, in order to clear the standard of non-combustible wood, the heating time is 20 minutes and the spraying strength is 50 kW / m ^2.
1) The total calorific value is 8 MJ / m ² or less. 2) There are no cracks or holes penetrating to the back side, which is harmful to fire prevention. 3) Maximum heat generation rate continues for more than 10 seconds, 200kW / m
Do not exceed ² . It is required to satisfy the above criteria. In addition to these combustion exothermic standards,
The following criteria for gas toxicity must also be satisfied. 4) Mice average action stoppage time in gas toxicity test
8 minutes or more.

However, the conventional methods of impregnation under reduced pressure or pressure impregnation as described above can meet the standards for flame-retardant wood and semi-incombustible wood, but cannot meet the standards for non-combustible wood. In particular, it is a barrier that the condition that the total calorific value of 1) is 8 MJ / m ² or less cannot be satisfied. In order to satisfy this condition, it is considered that the wood structure may be impregnated with as much flame retardant as possible, and this attempt has been made.

That is, in order to impregnate a large amount of nonflammable agent,
From the standpoint of repeating the impregnation step, first, after drying (drying step), impregnation under reduced pressure (vacuum impregnation step) and then pressurizing and impregnation (pressure impregnation step)
After that, the pressure impregnation step → the pressure impregnation step is repeated (see FIG. 5). However, no matter how many times the low pressure impregnation step → the pressure impregnation step is repeated, the incombustible treatment agent is impregnated only to a certain depth and does not reach a deeper wood texture region. Therefore, there is a certain limit to the amount of non-combustible treatment agent impregnated in the wood structure. Because of this, the present situation is that no non-combustible wood that satisfies the standard of non-combustible wood in the Building Standard Law has been provided.

[0008]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems. That is, an object of the present invention is to provide a method for producing non-combustible wood that can improve the impregnation amount of the non-combustible agent to the wood as much as possible. Furthermore, it is providing the manufacturing method of the incombustible wood which satisfy | fills the conditions of an incombustible wood completely also as a building standard method, and can be manufactured comparatively easily.

[0009]

[Means for Solving the Problems] However, the present inventors have conducted extensive research on such problems,
Rather than simply repeating the reduced pressure impregnation step and the pressure impregnation step, by adding a drying step once before repeating, surprisingly, the subsequent repetition of the reduced pressure impregnation step and the pressure impregnation step is not effective for the wood structure. The present inventors have found that it contributes extremely effectively to the penetrating action of the fuel and completed the present invention based on this finding.

That is, the present invention includes (1) a drying step for drying wood, a decompression step for decompressing the wood, a reduced pressure impregnation step for impregnating the wood with a nonflammable treatment agent under reduced pressure, and a wood under pressure. sequentially and a step pressure impregnation for impregnating the incombustible treatment agent
And then performing the drying step, the depressurizing step, and the reducing step.
The pressure impregnation step and the pressure impregnation step are sequentially performed, and finally
It exists in the manufacturing method of the noncombustible wood which performs a drying process .

Then, (2) a first drying step for drying the wood, a first decompression step for decompressing the wood in a decompressed container after drying by the first drying step, and a first decompression step After the pressure is reduced, the wood is immersed in a non-combustible treatment agent in a decompressed container and impregnated with the non-combustible treatment agent in the wood structure. The first pressure impregnation step in which the wood structure is impregnated with the non-combustible treatment agent so as to impregnate the wood structure with the incombustible treatment agent, and the wood impregnated with the incombustible treatment agent is impregnated in the first pressure impregnation step. A second drying step for drying, a second decompression step for depressurizing the wood in the decompressed container after drying by the second drying step, and a decompression in the second decompression step, and then in the decompressed container Immerse the wood in an incombustible treatment agent and apply the incombustible treatment agent to the wood structure. Second impregnation step of impregnation, second impregnation step, second pressure reduction impregnation step and second impregnation of the wood structure with the incombustible treatment agent by pressurizing the wood in a noncombustible treatment agent in a container. After impregnation by the pressure impregnation step and the second pressure impregnation step, the present invention resides in a third drying step of drying the wood impregnated with the incombustible treatment agent, and a method for producing incombustible wood.

In addition, (3) the first drying step resides in a method for producing non-combustible wood which is dried by heating to a moisture content of 15% or less.

In addition, (4), the second drying step resides in a method for producing non-combustible wood which is dried by heating to a moisture content of 30% or less.

In addition, (5) the third drying step is a method for producing non-combustible wood, which is dried by heating to a moisture content of 15% or less.

(6) In the decompression step,
The present invention resides in a method for producing non-combustible wood, which is treated at a negative pressure of −1.0 MPa to −0.7 MPa for a certain period of time.

In addition, (7) in the pressure impregnation step, the degree of pressurization is 0.7 MPa to 2.0 MPa.

(8) In the state after the third drying step, the incombustible treatment agent is 240 kg / m ^{3 in} solid amount.
It exists in the manufacturing method of the noncombustible wood which is the above.

In addition, (9) the method for producing non-combustible wood, wherein the treatment temperature of the non-combustible treatment agent in the pressure impregnation step is 60 to 90 ° C.

(10) The non-combustible treatment agent exists in the method for producing non-combustible wood which is a treatment agent containing at least borax, boric acid and phosphoric acid.

The present invention may employ a configuration in which two or more selected from the above 1 to 10 are combined as long as the purpose is met.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings, taking specific embodiments. The incombustible wood of the present invention uses an incombustible treatment agent and can be applied to various kinds of wood such as cedar, pine, and firewood as long as the incombustible treatment agent can be impregnated. Further, as the incombustible treatment agent used in the present invention, those usually used are applicable, and among them, a treatment agent containing at least borax, boric acid, and phosphoric acid is preferably used. In addition, additives such as organic leaching inhibitors may be appropriately added to this treatment agent as necessary. Examples of organic leaching inhibitors include acetic acid and phenolic compounds used for adhesives.

FIG. 1 is a diagram showing the principle steps for achieving the method for producing non-combustible wood in the embodiment of the present invention. First, the wood to be processed is cut into a plate material having a set size (for example, 24 mm × 120 mm × 2 m).

[First Drying Step] Next, the cut plate material B is placed in a drying container (or drying chamber) and dried. As the drying container used here, a commonly used steam dryer is used. The dimensions are, for example, 3 m in length and width x 10 in length
The one with the size of m is used. The plate material has a heating temperature of 40 to
Dry at 90 ° C. for a certain time (for example, about 4 to 7 days),
The moisture content is preferably 15% or less (for example, 7%). From the viewpoint of the infiltration efficiency of the non-combustible treatment agent, the moisture content is preferably in an air-dried state with a moisture content of 15% or less (a state in which there is little change in moisture content due to moisture absorption / release). Thereafter, the corners of the plate are cut by molder processing, and processed into a shape close to a product as shown in FIG. The plate material having such a shape can be enlarged by sequentially combining the end portions. In addition,
The plate materials arranged in the drying container are preferably stacked in order to efficiently dry. At that time, for example, the plate members are arranged so that a support member (for example, a spacer) is interposed between the plate members so as to maintain an interval of about 20 to 30 mm between the plate members.

[First Depressurization Step] Next, the plate material that has been dried to the moisture content of 15% or less through the above drying step is transferred to a closed container (can be used as a decompression or pressurization container) and stored. The airtight container A has a size of about 1.5 m (diameter) × 9.5 m (length), for example, as shown in a schematic structure in FIG. A supply valve 2, a processing agent pressurizing valve 3 communicating with the pressurizing pump, a processing agent discharge valve 4 and the like are provided [see FIG. 3A]. Again, in order to efficiently reduce the pressure, the plate material arranged in the sealed container is preferably stacked through a spacer, as in the drying step. The pressure reducing valve of the sealed container is opened to reduce the negative pressure to -1.0 to -0.7 MPa (megapascal) and left for a certain time (for example, about 30 to 90 minutes). Here, the negative pressure degree is preferably in the above range from the viewpoint of air escape efficiency. By reducing the pressure in this way, the plate material, that is, the structure of wood (mainly composed of a collection of temporary road pipes) is reduced to a negative pressure, and the impregnation action in the subsequent pressure impregnation step can be more effectively performed.

[First decompression impregnation step] Next, from the state decompressed by the decompression step, the treatment agent supply valve 2 of the hermetic container is opened and the incombustible treatment agent heated inside is quickly filled. Here, the heating temperature is preferably 40 ° C. or higher from the viewpoint of the impregnation efficiency in the subsequent first pressure impregnation step. However, if the temperature exceeds 90 ° C., phenomena such as “internal cracking” and “sagging” of the wood (plate material) tend to occur. Here, the filling time is preferably 10 to 10.
Although it takes 15 minutes, the degree of decompression gradually decreases with the supply of the liquid agent, and finally reaches atmospheric pressure. The plate material in the sealed container is immersed in the non-combustible treatment agent, so that the non-combustible treatment agent enters the negatively pressed wood structure. As the non-combustible treatment agent used here, a non-combustible treatment agent suitable for the plate material is selectively used as appropriate.

[First pressure impregnation step] Next, after the first decompression impregnation step, the inside of the sealed container filled with the incombustible treatment agent is added while the plate material is immersed in the incombustible treatment agent in the vessel as it is. Pressure (see FIG. 3B). Specifically, the pressure reducing valve is closed and the nonflammable treatment agent is pressurized through the treatment agent pressurizing valve 3 to set the inside of the sealed container to 0.7 to 2.0 MPa, while maintaining the temperature of the nonflammable treatment agent (for example, (About 30 to 120 minutes)
put. The above range of the degree of pressurization is preferable from the viewpoint of the permeability of the treatment agent and the prevention of deformation of the plate material. The sealed container used in the previous decompression process or decompression impregnation process is used, but it is naturally possible to use another pressurized container. Also in the case of this pressure impregnation step, the plate material is preferably stacked.
By pressurizing in this way, it is pressurized to a deep region of the wood structure. As a result, the incombustible treatment agent that has penetrated into the tissue in the first reduced pressure impregnation step naturally has a new incombustible treatment agent penetrated into the wood structure.

[Second Drying Step] Next, the plate material impregnated with the incombustible treatment agent in the first pressure impregnation step is again replaced with a drying container and dried. If the same thing as the drying container in a 1st drying process is employ | adopted here, it is efficient. In this drying step, it is preferable that the film is dried in an atmosphere of 40 to 90 ° C. for a certain time (for example, about 8 to 14 days) and dried to a state where the water content is 30% or less. In this case, from the viewpoint of the penetration efficiency of the treatment agent, it is not necessary to lower the moisture content as in the first drying step described above. The incombustible treatment agent that has penetrated into the structure of the plate material by this drying is solidified and fixed in the structure. When the nonflammable treatment agent is dried and solidified in the tissue, the volume of the treatment agent is reduced, and some voids remain in the tissue. This second drying process is in the middle of the whole process,
Very important, and ultimately at least 2 non-combustible agents
This is an indispensable process for fixing to about 40 kg / m ³ .

[Second decompression step] Next, the plate material dried to a moisture content of 30% or less in the second drying step is subjected to the first decompression step, the first decompression impregnation step, the first pressure impregnation step, and the like. Move to a similar sealed container and store. The incombustible processing agent in the sealed container has already been discharged through the processing agent discharge valve 4. Even when the plate material is depressurized in this step, it is preferable to perform depressurization again at a negative pressure degree of −0.1 to −0.7 MPa for a certain time (for example, 30 to 90 minutes). By reducing the pressure in this way, the pressure becomes negative even in a deep tissue region where the incombustible treatment agent has not yet penetrated and fixed.

[Second decompression impregnation step] Next, from the state decompressed in the second decompression step, the treatment agent supply valve of the sealed container is opened and heated (60 to 90 ° C) is filled with the non-combustible treatment agent. . Here, the heating temperature is preferably 40 ° C. or higher from the viewpoint of the impregnation efficiency in the subsequent first pressure impregnation step. However, 9
When the temperature exceeds 0 ° C., phenomena such as “internal cracking” and “sagging” of the wood (plate material) tend to occur. Here too, the filling time is preferably 10 to 15 minutes, but the degree of decompression gradually decreases with the supply of the treatment agent, and finally becomes almost atmospheric pressure.

[Second Pressure Impregnation Step] Next, a sealed container filled with the nonflammable treatment agent in the second reduced pressure impregnation step in a state where the plate material is immersed in the nonflammable treatment agent in the container, is here. The pressure is applied again to impregnate the wood structure with the non-combustible agent. And also here, the pressure reducing valve is closed and the nonflammable treatment agent is pressurized through the treatment agent pressurizing valve 3, and the inside of the sealed container is 0.7 to 2.0.
It is preferable to leave it at a fixed time (for example, 90 to 180 minutes) while maintaining the temperature of the nonflammable treatment agent at MPa. By pressurizing in this way, the incombustible treatment agent that has penetrated into the wood structure in the second reduced pressure impregnation step of the previous step can be more surely penetrated into the deeper region and the degree of impregnation of the treatment agent can be increased. That is, the component of the non-combustible treatment agent fixed to the wood structure by the second drying step is pressurized again and melted at a high temperature, so that a higher concentration non-combustible treatment agent is finally brought into a deeper region of the wood structure. It can be infiltrated into the body. Therefore, the treatment liquid temperature in the second pressure impregnation step is preferably a temperature at which the solidified treatment agent is dissolved. When the non-combustible treatment agent is boric acid type (for example, a treatment agent containing borax (sodium borate), boric acid, and phosphoric acid)
60 to 9 from the point that borax, boric acid and phosphoric acid fixed in the second drying step can be efficiently dissolved again.
It is more preferable that the heating is maintained at 0 ° C. Here, the sealed container used was the one used in the previous decompression step or decompression impregnation step, but it is naturally possible to use another sealed container.

[Third drying step] Next, the plate material impregnated with the incombustible treatment agent in the second pressurizing step is again replaced with a drying container and dried. If the same thing as the drying container in a 1st drying process and a 2nd drying process is employ | adopted here, it will be more efficient and economical. The drying here is in the final stage, so to speak, is heat drying for finishing, and is performed in an atmosphere of 50 to 90 ° C. for a certain time (for example, 8 to 14).
It is preferable to dry to a state where the water content is 15% or less. By this drying, the incombustible treatment agent that has penetrated into the deep structure of the plate material is also solidified and fixed in the structure. By setting the moisture content of the plate material to 15% or less, a product (a non-combustible plate material) is completed. By setting the water content to 15% or less, there is an advantage that the adhesiveness of the paint or adhesive to the product is improved. At this stage, the incombustible treatment agent contained in 1 m ^{3 of} wood is 240 kg / weight in terms of solid content (solid amount).
It is preferably m ³ or more.

[Weight Measurement] The weight of the product plate is measured, and if necessary, the surface is processed to obtain a plate having a constant weight.

[Packing] A plurality of plates are packed and stored.
In this way, after the first drying step → the first reduced pressure impregnation step → the first pressure impregnation step, the second drying step is further passed,
By passing through the reduced pressure impregnation step → the second pressurization impregnation step → the third drying step, a sufficient incombustible treatment agent can be impregnated in the structure, and impregnation of 240 kg / m ³ or more with a solid material becomes possible.

Although the present invention has been described above, the present invention is not limited to the embodiments, and it goes without saying that various other modifications are possible without departing from the essence thereof. . That is, the degree of decompression (negative pressure) and temperature in the decompression process, the temperature of the non-combustible treatment agent, the applied pressure and temperature in the pressure impregnation process, the temperature, time, and moisture content in the drying process are slightly changed depending on the type of wood. .

The method for producing noncombustible wood according to the present invention will be described below with reference to examples.

[Example] 100 mm (vertical) x test material (cedar board)
100mm (width) x 24mm (thickness) and 100mm
Two pieces of (length) × 100 mm (width) × 24 mm (thickness) were prepared. And the process like the manufacturing method of the incombustible wood of this invention was performed. That is, first, both the above test materials were dried in a drying container (manufactured by Shinshiba Equipment Co., Ltd.) at a heating temperature range of 45 to 70 ° C. for 6 days.
% Water content (first drying step). Next, the test material was put into an airtight container for pressure increase / decrease (manufactured by Hanayama Kogyo Co., Ltd.), and the pressure was reduced to a negative pressure of −0.98 MPa for 60 minutes (first pressure reduction step). Thereafter, the incombustible treatment agent heated to 80 ° C. in the airtight container is promptly (12
(About 1 minute) was filled (first reduced pressure impregnation step).

The non-combustible material used here is obtained by the following preparation. Noncombustible treatment agent Borax 17 parts Boric acid 9 parts Phosphoric acid 1 part Additives (organic leaching inhibitors, etc.) 3 parts Water 70 parts Total 100 parts

Next, the inside of the sealed container filled with the non-combustible treatment agent was treated for 60 minutes while maintaining the applied pressure at 1 MPa and 80 ° C. (first pressure impregnation step). Next, the test material impregnated with the incombustible treatment agent is again replaced with a dry container,
The moisture content was dried to 25% in an atmosphere of 80 ° C. for 12 days (second drying step). At this time, the average impregnation amount of the fixed nonflammable treatment agent was 170 kg / m ³ . Put the dried test material into a sealed container for decompression,
The pressure was reduced to negative pressure −0.98 MPa and left for 60 minutes (second pressure reduction step). Thereafter, the test material was immersed in a sealed container filled with a non-combustible treatment agent heated to 80 ° C. from the reduced pressure state (second reduced pressure impregnation step).

Next, the inside of the sealed container filled with the nonflammable treatment agent was maintained at a pressure of 1 MPa and 80 ° C. and left for 180 minutes (second pressure impregnation step). Next, the test material impregnated with the incombustible treatment agent is again replaced with a dry container,
The moisture content was dried to 15% in an atmosphere at 80 ° C. for 14 days (third drying step). At this time, the average amount of impregnated nonflammable treatment agent was 280 kg / m ³ . In addition, when the same treatment was performed except that the incombustible treatment agent was maintained at 45 ° C. in the second pressure impregnation step, the average impregnation amount was 280 kg / m ³ , which cleared the standard for incombustible materials. I have confirmed that. The corn calorimeter test (IS
O5660). In that case, it was heated for 20 minutes at a radiation intensity of 50 kW / m ² on the surface of the test material. In addition,
The processing conditions and test results are shown in Table 2.

[0039]

[Comparative Example 1] 100 mm (vertical) which is a test material (cedar board)
× 100mm (width) × 24mm (thickness) and 100mm
Two pieces of (length) × 100 mm (width) × 24 mm (thickness) were prepared. And the nonflammable process by the conventional method was performed at the process as shown in FIG. That is, first, the test material was heated in a drying container (manufactured by Shinshiba Equipment Co., Ltd.) at a heating temperature of 4
It dried in the atmosphere of 5-70 degreeC, and it was set as the moisture content of 7% (1st drying process).

Next, the test material was placed in an airtight container for pressure increase / decrease (manufactured by Hanayama Kogyo Co., Ltd.) and the pressure was reduced to a negative pressure of -0.98 MPa for 60 minutes (first pressure reduction step). Then, the incombustible processing agent heated at 80 degreeC was filled in the airtight container from the pressure-reduced state (1st pressure reduction impregnation process). The incombustible treating agent used here was the same as the treating agent of the above-mentioned example. Next, the inside of the sealed container filled with the incombustible treatment agent was treated for 60 minutes while maintaining the applied pressure at 1 MPa and 80 ° C. or more (first pressure impregnation step).

Next, a test material impregnated with an incombustible treatment agent is
Replace it with a dry container again, and change it to 1 at 60-80 ° C.
The moisture content was dried to 15% for 4 days (second drying step). A corn calorimeter test (ISO 5660) was performed on the two test materials subjected to the above treatment. In that case, the radiation intensity on the surface of the test material is 50 kW / m.
Heated at a strength of ² for 20 minutes. The processing conditions and test results are shown in Table 2.

[0042]

[Comparative Example 2] In this treatment, after the first pressure impregnation step in Comparative Example 1, the second pressure reduction step, the second pressure reduction impregnation step, and the second pressure increase step without passing through the second drying step. The impregnation step is repeated (see FIG. 5). That is, under the conditions as in Comparative Example 1, first, the first drying step, the first reduced pressure step, the first reduced pressure impregnation step, and the first pressure impregnation step were performed.

Next, the test material was immediately put into another airtight container for pressure increase / decrease (manufactured by Hanayama Kogyo Co., Ltd.).
The pressure was reduced to 8 MPa and the treatment was performed for 60 minutes (second decompression step). Then, the incombustible processing agent heated at 80 degreeC was filled in the airtight container with the pressure-reduced state (2nd pressure reduction impregnation process). The incombustible treating agent used here was the same as the treating agent of the above-mentioned example. Next, the inside of the sealed container filled with the nonflammable treatment agent was maintained at a pressure of 1 MPa and 80 ° C. and left for 180 minutes (second pressure impregnation step). Furthermore,
The test material impregnated with the incombustible treatment agent was again replaced with a dry container, and the moisture content was 1 for 14 days in an atmosphere of 60 to 80 ° C.
It was dried to 5% (third drying step). A corn calorimeter test (ISO 5660) was performed on the two test materials subjected to the above treatment. In that case, it was heated for 20 minutes at a radiation intensity of 50 kW / m ^{2 on} the surface of the test material. The processing conditions and test results are shown in Table 2.

[0044]

[Comparative Example 3] Here, the temperature of the incombustible treatment agent in the first pressure impregnation step in Comparative Example 1 is set to room temperature (in this case, room temperature 18
All processes were the same as in Comparative Example 1 except that And the cone calorimeter test (ISO5660) was implemented with respect to two processed test materials. In that case, it was heated for 20 minutes at a radiation intensity of 50 kW / m ^{2 on} the surface of the test material. The processing conditions and test results are shown in Table 2. As described above, it can be understood from the examples and comparative examples that in the present invention, the nonflammable treatment agent has a very excellent fixability. Further, it can be seen that if the impregnation amount of the incombustible treatment agent is 240 kg / m ³ or more, the standard as the incombustible material can be cleared.

[0045]

In the method for producing incombustible wood according to the present invention, after the first drying step → the first reduced pressure impregnation step → the first pressurized impregnation step, the second drying step is further passed, and the second reduced pressure step is performed. By passing through the impregnation step → the second pressure impregnation step → the third drying step, the wood structure can be sufficiently impregnated with an incombustible treatment agent up to a deep region. And we were able to provide the first non-combustible wood that could meet the Building Standard Law. Moreover, as a method for producing non-combustible wood, a drying process is provided in the series of processes, which makes it possible to produce non-combustible wood, which requires no special production process and uses conventional production equipment. There is an advantage that it can be manufactured easily.

[0046]

[Table 1]

[0047]

[Table 2]

[Brief description of the drawings]

FIG. 1 is a view showing each step for achieving a method for producing non-combustible wood in an embodiment of the present invention.

FIG. 2 is a diagram showing a product example (floor board) as a plate material.

FIG. 3 is a diagram showing a schematic structure of a closed container used in the production process of the present invention, in which (A) shows a state before filling with a non-combustible treatment agent, and (B) shows a non-combustible treatment. The state after filling with the agent is shown.

FIG. 4 is a diagram showing steps of a method for producing non-combustible wood in a conventional example (Comparative Example 1).

FIG. 5 is a diagram showing a process of another method for producing non-combustible wood in a conventional example (Comparative Example 2).

[Explanation of symbols]

1 ... Pressure reducing valve 2 ... Processing agent supply valve 3 ... Processing agent pressurization valve 4 ... Processing agent discharge valve A ... Airtight container B ... Plate material (wood)

──────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 10-329110 (JP, A) Japanese Patent Laid-Open No. 9-277209 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B27K 3/00-3/52

Claims (10)

(57) [Claims] 1. A drying process for drying wood, a decompression process for decompressing wood, a decompression impregnation process for impregnating wood with an incombustible treatment agent under reduced pressure, and an addition for impregnating the wood with an incombustible treatment agent under pressure. Pressure impregnation step in order, then the drying step
The pressure reduction step, the pressure reduction impregnation step, and the pressure inclusion.
A method for producing non-combustible wood, characterized by sequentially performing a dipping step and a drying step . 2. A first drying step for drying wood, a first decompression step for decompressing wood in a decompressed container after drying by the first drying step, and a decompression by the first decompression step A first reduced pressure impregnation step of immersing wood in an incombustible treatment agent in a decompressed container to impregnate the wood structure with the incombustible treatment agent;
A first pressure impregnation step and a first pressure impregnation step of impregnating the wood structure with the incombustible treatment agent by applying pressure in a state where the wood is immersed in the incombustible treatment agent in the container after impregnation in the first reduced pressure impregnation step A second drying step for drying the wood impregnated with the non-combustible treatment agent after the impregnation by the second drying step, a second decompression step for decompressing the wood in a decompressed container after drying by the second drying step, 2 After depressurizing by the depressurization step, after immersing wood in a noncombustible treatment agent in a decompressed container and impregnating the wood structure again with the noncombustible treatment agent, and after impregnation by the second depressurization impregnation step The second pressure impregnation step in which the wood is pressurized in a container soaked in the non-combustible treatment agent and the wood structure is impregnated again with the wood structure. And a third drying step for drying the wood impregnated with Method of manufacturing incombustible wood, characterized and. 3. The method for producing incombustible wood according to claim 2, wherein the first drying step is performed by heating to dry the moisture content to 15% or less. 4. The method for producing incombustible wood according to claim 2, wherein the second drying step is performed by heating to dry the moisture content to 30% or less. 5. The method for producing non-combustible wood according to claim 2, wherein the third drying step is performed by heating to dry the moisture content to 15% or less. 6. A negative pressure level of −1.0 MPa in the depressurization step.
The method for producing non-combustible wood according to claim 2, wherein the treatment is performed at -0.7 MPa for a predetermined time. 7. In the pressure impregnation step, the degree of pressurization is 0.7M.
The method for producing incombustible wood according to claim 2, wherein the treatment is performed at Pa to 2.0 MPa for a predetermined time. 8. The method for producing incombustible wood according to claim 2, wherein the incombustible treatment agent is 240 kg / m ³ or more in solids after the third drying step. 9. The method for producing non-combustible wood according to claim 2, wherein the treatment temperature of the non-combustible treatment agent in the second pressure impregnation step is 60 to 90.degree. 10. The method for producing incombustible wood according to claim 2, wherein the incombustible treatment agent is a treatment agent containing at least borax, boric acid, and phosphoric acid.