JP6915885B2 - Semi-incombustible or flame-retardant wood and its production method - Google Patents

Description

The present invention relates to semi-incombustible or flame-retardant wood and a method for producing the same.

(Current status of semi-incombustible or flame-retardant wood)
Many of the chemical-injected woods on the market today are made by impregnating wood materials with chemicals for antiseptic, insect repellent, flame-retardant and semi-incombustible treatments. For example, by adopting the method of injecting chemicals into lumber and laminated lumber lamina, insizing processing is performed to slightly increase the amount of chemical injection, but the core and sapwood parts are infiltrated with chemicals. The degree varies greatly. As a result, there were large variations in the performance of chemical-injected wood and the performance of wood products, and some of them did not meet the standard values for chemical-treated wood. When a flame-retardant semi-incombustible wood material with an insufficient chemical injection is heated, it reaches a high temperature range of about 200 ° C. or higher, and flammable gas is generated from the wood structure of the insufficient part. When the gas ignites, its fire resistance is greatly impaired.

(Changes in the timber market in Japan today)
An overview of the timber market in Japan today shows the following changes.

The market for single-family wooden houses, which is the largest market for timber, is shrinking due to the declining birthrate and aging population.
On the other hand, in medium- and large-scale buildings where an unspecified number of people gather, such as public facilities, stores, offices, and accommodation facilities, it is required to create "comfort" and "fashionable image", and the interior and exterior of wood. Market is expanding. In such medium- and large-scale buildings where an unspecified number of people gather, safety in the event of a fire is an important factor, so there is a demand for wood that meets the stable performance of "flame-retardant / quasi-non-combustible". It has increased.

(Problems of conventional products / technologies and their effects)
Next, the problems of the technology of the conventional products provided to date and their effects can be summarized as follows.

-In the flame-retardant / semi-non-combustible wood in the conventional product, there is a part where the injection amount of the non-combustible treatment agent is insufficient. As a result, some products have insufficient performance, and the reliability of the performance of flame-retardant and semi-incombustible wood is impaired.
-In order to set the minimum injection amount as the reference value, over-injection of non-combustible chemicals is performed, resulting in cost increase and efflorescence phenomenon on the product surface.
-Performance varies due to immaturity of process control and quality control, and the adverse effects of insufficient process and quality control capabilities are becoming apparent.

(Basic technical knowledge)
The technical basic knowledge of the present invention is as follows.

-Knowledge about the fact that liquid water or aqueous solution hardly moves in wood except for sapwood.
-Knowledge of the fact that the movement of liquid water or aqueous solution in wood is mainly in the fiber direction, and the movement in the direction orthogonal to the fiber is extremely slow.
-Conifers and sprinklers Knowledge of the fact that aqueous solutions infiltrate the sapwood of broad-leaved trees, but it is difficult for sapwood to infiltrate ring-pore hardwoods.
-There are three types of chemical injection treatment depending on the purpose of chemical treatment, but insect repellent treatment (chemical injection into the white line band and sapwood where there are many nutrients of insects such as starch) and antiseptic treatment (chemical treatment only around the wood) ) And semi-incombustible / flame retardant chemical treatment (uniform chemical injection treatment into wood), and perform treatment suitable for semi-non-combustible / flame retardant chemical treatment (uniform chemical injection treatment into wood). What should be done.
・ Manufacturing methods and quality control that are particular about the minimum standard value or higher may result in unstable processing such as overinjection. Therefore, for products that require safety, statistical figures are used for performance and quality control. It should be controlled by (standard deviation, process control ability value).
-Flame-retardant / semi-incombustible wood injection chemicals often have adhesion-inhibiting factors, and if they are bonded after injection, they often do not have sufficient adhesive strength for their intended use.

(Prior art documents and their problems)
Prior art documents relating to such fire-resistant modified wood-based materials include Patent Documents 1 to 5, but do not indicate a technique in which only the sapwood portion is used by clearly distinguishing the core material portion and the sapwood portion. Of course, no proposal has been made positively utilizing the fact that the sapwood portion has the property of satisfactorily moving the liquid in the direction in which the fibers grow.

Specifically, in paragraph 0014 of the specification of Patent Document 1, the time for performing the dipping treatment is set to a wide range of 6 to 72 hours, and the reason is that the thickness and arrangement of the conduits are made of wood. In addition to mentioning that it differs depending on the type, it is pointed out that the sapwood part has a thick conduit and a coarse density as a specific example. However, in Patent Document 1, it is out of the question that conifers and hardwoods cannot be distinguished in the first place. Further, in the examples below paragraph 0022 of the specification, only cedar board and paulownia board are used as the raw material wood, and the heartwood part and the sapwood part are not used separately, and the description is made as if a conduit exists. There is no conduit itself in the cedar, and in the case of paulownia, it is a perforated broad-leaved tree and an aqueous solution can be injected around the conduit in the sapwood part. There is doubt in the perception itself that is low. As described above, on the premise that the core material portion and the sapwood portion are not used separately in Patent Document 1, in other words, the non-combustible wood board is manufactured by adjusting the treatment conditions without using the core material portion and the sapwood portion separately. It is recognized that it discloses the technical idea that it can be done.

Also in Patent Document 2, it is shown in paragraph 0011 of the specification that the conduit and its peripheral portion are impregnated with a sufficient fireproofing agent, but in the examples below paragraph 0017 of the specification, the raw material wood is used. Only the paulownia board is used, and the heartwood part and the sapwood part are not used separately. As described above, in Patent Document 2, on the premise that the core material portion and the sapwood portion are not used separately, in other words, the explosive chemical solution impregnated in the paulownia wood and the paulownia wood material are used even if the core material portion and the sapwood portion are not used separately. It discloses the technical idea that the nonflammable properties can be remarkably improved by forming a glass-like film which is presumed to be formed by a cross-linking reaction of tannins potentially impregnated in the wood. Is recognized.
In addition, the inventor of the present invention has never heard that paulownia lumber has peculiar tannins, and even if it undergoes a cross-linking reaction, it is still an organic substance, and it is considered that the difficulty of burning is irrelevant. Is.

In Patent Document 3, the chemical solution is adhered only to the portions of the plurality of recess-forming protrusions, and the protrusions are pressed against the dried veneer, whereby the veneer is further compressed to the thickness or less and the chemical solution is simply applied. The present invention proposes a method of injecting a chemical solution into a veneer, which comprises contacting the veneer with the protrusions and then separating the protrusions from the veneer to allow the chemical solution to permeate into the tissue of the veneer. However, in the method of Patent Document 3, it is unlikely that the chemical enters the inside of the wood, and the core material portion and the sapwood portion are not used separately, and even if the chemical solution is adhered only to the protrusion for forming the recess, the chemical solution may be attached. There is almost no movement of the chemical solution in the heartwood.

In Patent Document 4, a cavity portion and a groove portion continuous or intermittent with respect to the length direction of the square lumber are formed in the laminated portion made of the plate material excluding the front side portion and the rear side portion of the square lumber, and these cavities are formed. A large number of wall constituents are formed by injecting a filler into a part of a portion or a groove, and after these wall constituents are stacked in the vertical direction and connected by a joining means, the filler in the cavity or the groove is not filled. It is proposed to inject a filler into the injection part to close the joint gap of each wall constituent material and construct an integral wall. However, even in Patent Document 3, the core material portion and the sapwood portion are not used separately, and the chemical solution hardly moves in the core material portion. Moreover, in Patent Document 4, the chemical solution can be injected into the cavity or groove formed between the plate materials, but the chemical solution cannot be injected into the inside of each plate material, and the chemical solution of each plate material cannot be injected. The movement of the drug solution inside cannot be expected.

In Patent Document 5, a chemical solution is dripped into a groove in which each of the four sides of the wood is split into a back by a saw, and the chemical solution is poured into the wood. Holes are made from each of the four sides of the wood at right angles to the back split, and the resin that has flowed inside the wood enters the horizontal holes and becomes a force bone. We are proposing wood and wood processed products whose surface is also treated with a chemical solution when the synthetic resin solution is cured. However, even in this Patent Document 5, the core material portion and the sapwood portion are not used separately, and it is difficult to move the chemical solution in the core material portion. Moreover, the grooves that have been split back by sawing are provided along the direction in which the fibers of the wood extend, and the movement of the chemical solution between the grooves can hardly be expected.

Japanese Patent No. 4221599 JP-A-2007-63749 Japanese Patent No. 3344703 Japanese Unexamined Patent Publication No. 11-131635 Japanese Unexamined Patent Publication No. 8-281203

An object of the present invention is to improve the reliability of fire resistance of semi-incombustible or flame-retardant wood.
Another object of the present invention is to provide a method for producing semi-incombustible or flame-retardant wood having improved reliability in terms of fire resistance.

The present invention provides semi-incombustible or flame-retardant wood obtained by using a plank of only sapwood of softwood and perforated broad-leaved wood as a raw material and laminating these through an adhesive as a means for solving the above-mentioned problems. do.

That is, the important points of the present invention in comparison with the above prior art documents are the following three points.
1. The injection is planned by utilizing the knowledge that the aqueous solution chemical can easily move in the fiber direction of the lumber sapwood part.
2. Inject the drug into the center of the product by inserting injection slits in the direction perpendicular to the fiber in order to level the drug injection and adhering the surfaces provided with the injection slits of the plank.
3. A quality control method for confirming that the presence of drugs is leveled has been established by introducing statistical values.
That is, for the amount of non-combustible chemicals in wood, a predetermined number (for example, 30) of samples are collected for each lot, and the average value and standard deviation value are used to perform quality control at the same accuracy level as 100% inspection.

Specifically, injection slits having a predetermined depth are inserted into the overlapping surfaces of the planks with a saw or the like at appropriate intervals in the direction intersecting the fiber extending direction.
A plurality of planks are laminated with a water-resistant adhesive or the like with the overlapping surface containing the injection slit inside.
Incombustible chemicals such as water-soluble are injected under reduced pressure and pressure into the laminated planks.

The front and back surfaces of the semi-incombustible or flame-retardant wood thus obtained are injected with the chemicals mainly by diffusion from the front surface at a depth of about 5 mm.
The drug invades the central portion through the injection slit, and the invaded drug moves satisfactorily along the direction in which the fibers in the sapwood grow, so that the drug is injected as a whole.
After decompression / pressure injection, it is desirable to take an appropriate curing time to level the amount of chemicals inside the product.

Injection slits exist at predetermined intervals in the center of the semi-incombustible or flame-retardant wood product in the thickness direction, but since there are no scratches on the front and back surfaces, the appearance is not spoiled and the injection slits match perfectly. By doing so, it is possible to prevent the strength of the product from being extremely lowered.

The present invention has been able to provide semi-incombustible or flame-retardant wood with improved reliability in terms of fire resistance.
The present invention has been able to provide a method for producing semi-incombustible or flame-retardant wood with improved reliability in terms of fire resistance.

A description of the cross-sectional structure of a raw wood for obtaining a plank for semi-incombustible or flame-retardant wood according to an embodiment of the present invention. (A) A perspective view of a plank for semi-incombustible or flame-retardant wood, and (B) a perspective view of a laminated material in which the same planks are bonded to each other. (A) Cross-sectional view of semi-incombustible or flame-retardant wood, (B) Cross-sectional view of semi-incombustible or flame-retardant wood according to other embodiments. It shows the semi-incombustible or flame-retardant wood according to another embodiment devised to increase the distance of the slits, (A) a plan view of one plank, and (B) a plank of the other. (C) A plan view of a laminated material in which both planks are laminated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(overview)
The semi-incombustible or flame-retardant wood 10 according to this embodiment is formed by stacking a plurality of (two upper and lower boards in the example of FIG. 2) of the planks 11 and laminating them via an adhesive 14. As shown in FIG. 1, each plank 11 is composed of only one of the sapwood portions A of the softwood and the perforated broad-leaved lumber, and is formed along the longitudinal direction of each plank 11. , The fiber is stretched.

Each of the plank plates 11 has a plurality of injection slits 21 formed on the stacking surface 13, and each of the stacking surfaces 13 is formed between the left and right side surfaces of the plank plate 11, and is described above. Each injection slit 21 extends across the fibers of the. At least one end, preferably both ends, of the injection slit 21 are opened as injection openings 23 on the left and right side surfaces of each plank 11, that is, the completed semi-incombustible or flame-retardant wood 10.

The non-combustible treatment agent 31 that has moved along the fibers from the injection slit 21 is present in each of the plank plates 11, and the non-combustible treatment agent 31 that has diffused from the outer surface 12 is present on the upper and lower surface plates 11. By the presence of the semi-incombustible or flame-retardant wood 10, the non-combustible treatment agent 31 is present in the entire inside of the semi-incombustible or flame-retardant wood 10, and the performance as the semi-incombustible or flame-retardant wood is guaranteed.

(Manufacturing of plank plate 11)
In general, wood is often roughly divided into a sapwood part and a heartwood part. The sapwood part is the cross section of a log and refers to the whitish part of the outer circumference, and the heartwood part is the cross section of a log and the center part. It is said that it refers to the reddish part of the color of, but more specifically, the heartwood part can be divided into two areas, the immature part and the mature part in the central part, and the sapwood part and the heartwood part. There may be a white line band in the boundary area of. Therefore, as shown in FIG. 1, it can be divided into four regions from the outside: the sapwood portion A, the white line band B, the core lumber matured portion C, and the core lumber unripened portion D.

In the present invention, only the sapwood portion A in which the liquid can move in the direction in which the fibers extend inside the wood is used, and the plank plate 11 in which the direction in which the fibers extend from this portion (the vertical direction of the standing tree) is the longitudinal direction. Is manufactured by cutting or the like. The remaining white line band B, the heartwood aged portion C, and the heartwood unripened portion D shall be used for other purposes.

Roughly speaking, the sapwood part and the heartwood part are often distinguished by the color tone difference by visual observation of the cross section, but some tree species do not have a color tone difference, and the appearance is that the four areas are clearly separated. Some of the above are difficult. Therefore, prior to mass production, it is preferable to perform an injection test of a colorant on wood obtained from a standard log, which is an index, and confirm the state of movement of the colorant in the direction of fiber elongation.

The thickness of the plank 11 can be changed in various ways. For example, a board (grain) having a thickness of 12 mm to 20 mm is used as a raw material in the periphery of the log, which is called a back plate, which is produced when the log is sawn into columns or beams. Is preferable.
More specifically, the sawn dimensions of the plank 11 are suitable to have a thickness of 12 mm to 20 mm, a width of 100 mm to 200 mm, and a length of 1 m to 4 m.

In particular, since water is a liquid and difficult to move in the knotted portion, it is preferable to use the knotless portion from the viewpoint of quality stability.
In addition, when the length is connected, the adhesive layer stretches like cutting the fibers, which acts as a wall and hinders the infiltration of the drug. Therefore, as a general rule, the lengths of the raw material plates are not connected.

After sawing, it is preferable to perform pre-drying. Specifically, the wood is naturally dried to a moisture content of 20% or less until the free water in the wood is exhausted. On the other hand, excessive drying with a moisture content of 10% or less is inappropriate because it may cause a problem in the infiltration (wetting) of wood.
Further, it is preferable that the obtained wood is planer-processed to a thickness of 9 mm to 17 mm from the viewpoint of constant quality.

(Processing of injection slit 21)
For injection, which extends in the direction across the fibers of the plank plate 11 on the overlapping surface 13 where the plank plates 11 are overlapped and adhered on the premise that the chemical solution such as the non-combustible treatment agent 31 moves mainly in the fiber direction. The slit 21 is formed. Specifically, the injection slit 21 is preferably slit with a saw in a direction 45 degrees from a right angle with respect to the direction in which the fiber is stretched.

The width of the injection slit 21 is appropriately set to a width sufficient for the aqueous solution to pass through, and specifically, it is preferably about 2.5 mm to 3.0 mm.
The depth of the injection slit 21 is preferably formed from the overlapping surface 13 toward the other surface so that about 5 mm remains from the bottom of the slit. Although it depends on the thickness of the plank plate 11, it is appropriate to set the depth to 1/2 to 2/3 of the plate thickness.

In addition, the distance between the injection slits 21 should be set to a distance that allows sufficient infiltration in the preliminary test for injection of the stain solution for each raw material lot (tree species, production area, raw material receiving lot) in consideration of the type of tree and the regional difference in growth. ) Is appropriate.
A temporary lid material 16 such as a thin tape (for example, width: 5 mm to 10 mm) such as thin paper is attached to the open surface 22 of the injection slit 21. This makes it possible to prevent a large amount of the adhesive 14 from flowing into the injection slit 21 and hindering the infiltration of the chemical solution when the planks 11 are bonded to each other. It may be omitted depending on the properties and bonding conditions. Further, a closing sheet having substantially the same size as the overlapping surface 13 may be attached to the entire surface of the overlapping surface 13, and the injection slit 21 is not limited to the tape as long as it can be covered. It can be implemented with various changes.

(Laminating process)
The laminated material 15 shown in FIG. 2B is manufactured by superimposing the overlapping surfaces 13 of the plurality of planks 11 (two in FIG. 2) via the adhesive 14 and adhering them according to a conventional method. .. As the adhesive 14, various water-resistant adhesives 14 that can be used for laminating wood can be adopted.

(Injection of drug)
The chemical injection process is a step of injecting a non-combustible treatment chemical into the laminated material 15 whose moisture is easily transferred. Specifically, the semi-incombustible or flame-retardant wood 10 is completed by injecting an aqueous solution of a non-combustible, semi-non-combustible, flame-retardant treatment agent or the like into the laminated material 15 using a vacuum pressure injection can (FIG. 3 (A). )reference). In the plank plate 11 obtained from the sapwood portion A, conduits and temporary conduits that have not yet lost liquid permeability extend continuously in the fiber direction (arrow direction), so that the injection slit 21 and the injection slit 21 The injection movement of the chemical solution from the end surface of the wood is fast, and the entire semi-incombustible or flame-retardant wood 10 can be impregnated with the chemical for fire resistance. Further, the chemical solution can be impregnated from the outer surface 12 of the semi-incombustible or flame-retardant wood 10 by diffusing the chemical solution into the inside. The impregnation by this diffusion is about 5 mm from the outer surface 12 of the semi-incombustible or flame-retardant wood 10, but as described above, the depth of the injection slit 21 is set to a depth until about 5 mm remains from the bottom of the slit. Therefore, the entire inside of the laminated material 15 can be impregnated with the chemical.

Since the impregnation state of the chemical solution changes depending on the type of wood and the growing condition, the decompression condition and time, the pressurization condition and time, and the number of repetitions should be confirmed by a preliminary experiment using a water-soluble colorant. Is preferable.
Further, it is preferable to measure the weight before and after the injection as the injection amount in the process control, and control the difference as the average injection amount of the lot.

As shown in FIG. 3A, the non-combustible treatment agent 31 that has entered the injection slit 21 from the injection opening 23 moves in the fiber direction, so that the non-combustible treatment agent 31 is placed in the central portion of the thickness of the laminated material 15. A wall that suppresses gas generation from the wood by infiltration is formed in the central portion, and a wall that suppresses gas generation is created near the surface of the laminated material 15 by diffusing the non-combustible treatment agent 31 from the outer surface 12. In this way, by creating a wall with the non-combustible treatment agent 31 at three places on the front surface, the central portion, and the back surface in the thickness direction, a wood-based material having semi-incombustible performance (that is, semi-incombustible or semi-incombustible) as well as high heat insulation of wood. Create flame-retardant wood 10). When two planks 11 are used, it is possible to specify that the laminated dimensions are 18 mm to 34 mm in thickness, 100 mm to 200 mm in width, and 1 m to 4 m in length, but these values have been changed. It may be carried out.

For example, when it is desired to increase the laminated thickness, as shown in FIG. 3B, three or more planks 11 can be laminated. In such a case, it is desirable to form injection slits 21 from both the upper and lower sides of the inner plate 11 to carry out the injection. It is appropriate that the depth of the injection slit 21 of the inner plate 11 is set to a length such that a part of the inner plate 11 overlaps with each other so that there is no space between the upper and lower plate 11s in the thickness direction. be. Further, it is preferable to provide the planks 11 in a staggered manner at positions where the planks 11 do not overlap each other in the longitudinal direction from the viewpoint of maintaining the strength of the completed semi-incombustible or flame-retardant wood 10.

Further, as shown in FIG. 4, when the injection slits 21 are formed in an inclined manner, it is preferable to arrange and form the injection slits 21 so as to cross each other in a plan view.
In order to improve the effect of drug injection and reduce the amount of waste material mixed with drug, it is preferable to process the drug into a size and shape close to the finished state in advance before injecting the drug.

(Process after injection)
Curing: It is preferable to cure the injected chemicals for leveling the inside of the wood, and the curing period is determined by preliminary experiments.
Drying: The moisture content is controlled in order to satisfy the quality of the product determined by making arrangements with the sales destination. From the viewpoint of improving quality, it is preferable to perform artificial drying.

Finishing: In order to satisfy the specified conditions as a product, finishing such as finishing the board width with a lip saw, the length with a cross cut saw, and the surface with a sander is performed.
Inspection: Perform the inspection necessary to satisfy the quality of the product. For example, the thickness and width are measured with calipers, the length is measured with a steel tape measure, and the appearance and surface are visually and touched.
Packing: Semi-incombustible or flame-retardant wood 10 products are bundled in small bundles and covered on 6 sides to block moisture from the outside air, or covered with kraft paper and fixed with tape to prevent damage. To give.

The semi-incombustible or flame-retardant wood 10 according to this embodiment can exhibit substantially uniform and good fire resistance as a whole of the fire-resistant modified wood-based material. When a wood-based material containing an insufficiently injected chemical is heated, it reaches a high temperature range of about 200 ° C. or higher, and a flammable gas is generated from the wood structure of the insufficiently injected portion, and the gas ignites. .. As a result, its fire resistance is greatly impaired, but since the semi-incombustible or flame-retardant wood 10 of the present invention is impregnated with a sufficient amount of fire-resistant chemicals substantially entirely, flammable gas is emitted from the wood structure. It is possible to suppress the occurrence and show stable fire resistance.

(Process control)
In carrying out the present invention, process control is important in order for all the produced semi-incombustible or flame-retardant wood 10 to exhibit stable fire resistance.
-Confirmation of infiltration length After pre-drying, 4 to 6 samples are collected for each production lot, and a stain injection test is performed to confirm the infiltration length of the drug. The test method is to make a slit in the center of the length of a 1.2 m long plate, seal both ends of the wood, inject the staining solution under reduced pressure and pressure, and then cut every 10 cm in length to stain the cut surface. Check for liquid infiltration. After confirmation, slits shall be made approximately every 1/2 of the maximum infiltration length.

-Measurement of water content before injection Since the water content before injection affects the impregnation of chemicals, it is important to measure the water content by measuring with a high-frequency water content meter. Desirably, 6 test pieces are randomly collected for each production lot and measured by the total dry method.

-Measurement of drug injection amount A sufficient amount of drug is injected by measuring the weight of the injection lot before and after the decompression / pressurization process for each injection lot and managing the difference as the average drug injection amount of that lot. Check if it is.

-Measurement of water content after drying Six samples are taken for each production lot, the weight is measured by the total drying method, and the average amount of chemicals is subtracted from the measured weight to estimate the water content. Create a correlation table between this value and the value of the high-frequency moisture content meter to measure the moisture content of small lots of products.

-Confirmation of dimensional accuracy Measure with the thickness and width of semi-incombustible or flame-retardant wood 10 = calipers. Accuracy depends on the customer's agreement.
Measure with a length of semi-incombustible or flame-retardant wood 10 = steel tape measure. Accuracy depends on the customer's agreement.

-Product inspection Visually inspect the appearance of all products. The content depends on the agreement with the customer.
・ Check the packaging After bundling, cover all 6 sides of the product with a plastic sheet to prevent it from coming into contact with the outside air.
Wrap in kraft paper, a pallet necessary to prevent scratches caused by handling cargo.

・ Check the display Paste a piece of paper with the following details on the outer side of the package and the end of the package.
Product name, product grade, raw material tree species, processing chemical type, product dimensions, product quantity (quantity), producer name, production location, production lot number and bundle number.

(quality management)
In addition to the above-mentioned process control, quality control is thoroughly performed, and only products showing stable fire resistance are shipped.

・ Combustion test = Conducted in accordance with the Ordinance of the Ministry of Land, Infrastructure, Transport and Tourism. Specifically, the number of corn calorimeters is measured according to the required population parameter under predetermined conditions. By creating a relative relationship record between the corn calorimeter test result and the injection amount for each injection lot, the accuracy of process control can be improved.

-Adhesion test = JAS interior laminated lumber is tested for each production lot.
・ Drug injection amount management = Control the drug amount before and after drug injection (frequency = for each injection lot). Specifically, the weight of the material placed on the trolley before and after the injection is measured, the difference is calculated and divided by the wood volume to obtain the average injection chemical amount per m3 of the lot. Confirm that the obtained statistical value of the average infused drug amount (mean value-3σ) exceeds the acceptance standard drug amount (σ = standard deviation).
-Variation management = Partial drug amount variation management (frequency = for each order lot, in the case of ready-made products, for each production lot). Specifically, samples are collected every 30 cm to 10 cm inside from both ends of the product length, and a total of 30 samples are collected. The end surface of each sample is photographed with a hyperspectral camera to take a specific wavelength spectrum of the non-combustible agent, and the amount of the near-infrared specific wavelength spectrum reflected by the non-combustible agent is measured. It should be noted that a correlation table between the drug concentration and the amount of reflection of a specific spectrum wavelength is prepared in advance and carried out.

Calculate the average value (AVE) and standard deviation (σ) of the non-combustible drug amount measurement values of 30 samples, confirm that AVE-3σ exceeds the minimum value of the required drug amount, and pass the lot. Ship.
As described above, in the quality control according to this embodiment, instead of inspecting all the chemical amounts of all the products, the quality control of the chemical injection amount in the wood is performed using the average value and the standard deviation value. .. Specifically, instead of inspecting the total amount of the drug in all products, 30 samples were randomly collected at predetermined distances (for example, every 10 cm) from a part separated from the product end surface by a predetermined distance (for example, 30 cm) or more. , The forehead surface is photographed with a hyperspectral camera, and the amount of the injected drug is measured by the amount of wavelength reflected light peculiar to the injected drug. By performing quality control of the drug injection amount using the average value and the standard deviation value with a predetermined number of samples (for example, 30) of the measurement result, the quality control is performed at the same accuracy level as the 100% inspection.

10 Flame-retardant wood 11 Plank 12 Outer surface 13 Laminated surface 14 Adhesive 15 Laminated material 16 Temporary lid material 21 Injection slit 22 Open surface 23 Injection opening 31 Non-combustible agent A Sapwood part B White line band C Heartwood aging part D Heartwood immature part

Claims (2)

In wood, which is made by stacking multiple planks and laminating them via an adhesive.
The plank is composed of only at least one sapwood of softwood and hardwood with perforated holes.
The longitudinal direction of the plank substantially coincides with the fiber direction.
Each of the above-mentioned planks is provided with an injection slit on the overlapping surface.
The injection slit is provided so as to cross the fiber between the left and right side surfaces of the plank.
By laminating one of the planks on the other plank, the open surface of the injection slit of one of the planks is closed by the other plank.
The injection slits are not provided on the upper and lower outer surfaces of the wood, and the injection slits are not provided.
In the plank, there is a non-combustible treatment agent that has moved from the injection slit through the temporary conduit or the inside of the conduit along the fiber.
In addition, the semi-incombustible or flame-retardant wood is characterized in that the non-combustible treatment agent diffused from both the upper and lower surfaces is present in the planks on both the upper and lower surfaces of the wood. In a method of producing wood having a predetermined thickness by superimposing a plurality of planks and laminating them via an adhesive.
The plank is manufactured by using only one of the softwood and the perforated hardwood sapwood so that the fibers of the plank extend in the longitudinal direction of the plank.
An injection slit extending in a direction crossing the fiber is formed between the left and right side surfaces of the plank on the overlapping surface of the planks.
The planks, which are the upper and lower outer surfaces of the wood, are not formed with injection slits on the outer surface.
After the overlapping surfaces of the planks are adhered to each other with the adhesive, the non-combustible treatment agent is injected under reduced pressure and pressure.
The non-combustible agent is moved along the fibers from the injection slit through the temporary conduit and the conduit, and at the same time.
A method for producing semi-incombustible or flame-retardant wood, which comprises diffusing the non-combustible treatment agent from the outer surface onto the planks on both the upper and lower surfaces of the wood.

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