WO2018003935A1 - Procédé de fabrication de bois stratifié - Google Patents

Procédé de fabrication de bois stratifié Download PDF

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Publication number
WO2018003935A1
WO2018003935A1 PCT/JP2017/024001 JP2017024001W WO2018003935A1 WO 2018003935 A1 WO2018003935 A1 WO 2018003935A1 JP 2017024001 W JP2017024001 W JP 2017024001W WO 2018003935 A1 WO2018003935 A1 WO 2018003935A1
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Prior art keywords
wood
sealed container
laminated
wooden
wood material
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PCT/JP2017/024001
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English (en)
Japanese (ja)
Inventor
展淳 福田
Original Assignee
公立大学法人北九州市立大学
株式会社三栄建築設計
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Application filed by 公立大学法人北九州市立大学, 株式会社三栄建築設計 filed Critical 公立大学法人北九州市立大学
Priority to JP2018525271A priority Critical patent/JP6530865B2/ja
Publication of WO2018003935A1 publication Critical patent/WO2018003935A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/06—Softening or hardening of wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles

Definitions

  • the present invention relates to a method for producing laminated timber.
  • laminated timber that can be used as a structural material is greatly expanding the market.
  • the amount of laminated timber used has continued to rise since 2000 and declined during the Lehman shock, but since then it has recovered and is still rising moderately.
  • Glulam can be obtained as a 6m long beam or large plate, which is difficult to obtain with general wood, and it has about 1.5 times the strength of normal wood (same level as general glulam), and varies. Because there is no structure, it is possible to calculate the structure, so it is traded at a higher price than ordinary wood.
  • Patent Document 1 is disclosed as a method for manufacturing the laminated lumber. Specifically, a wooden material including a ground plate and / or a small square material is placed in a sealed container, and high-temperature and high-pressure steam is supplied into the sealed container to soften the wooden material. And compressed wood is formed by compressing (further fixing) perpendicular
  • the wooden material is continuously softened and compressed (or further fixed) in the same sealed container. Therefore, the wooden material to be processed next is completed until these processes are completed. Cannot be placed in a sealed container. Since these processes require a relatively long time, the processing in the sealed processing container becomes a bottleneck for improving productivity. Moreover, since it is necessary to carry out all the above-mentioned processes when manufacturing the laminated wood, the equipment becomes complicated and maintenance is required, and the introduction cost of the equipment is also high. For this reason, there is room for improvement in the production efficiency and mass production of laminated timber and the manufacturing equipment. If logs can be used instead of a draw board or square lumber for wooden materials, processing costs for making the draw board or square lumber will not be incurred, and manufacturing costs can be reduced. Glulam could not be made without going through the process of processing into plates and squares.
  • the present invention has been made in view of such circumstances, and an object thereof is to improve the production efficiency of laminated timber without complicating the manufacturing apparatus.
  • the first invention includes a first step of softening a wooden material by charging the wooden material into a sealed container in which the wooden material can be charged and supplying water vapor, and a sealed container.
  • the second step of compressing the softened wood material to form compressed wood while taking out the softened wood material from the inside of the airtight container or after taking it out of the airtight container Provide a method.
  • the softening of the wood material is performed with the inside of the sealed container in a reduced pressure state.
  • a wooden material is charged into a sealed container in which the wooden material can be charged, and after the inside of the sealed container is depressurized, water vapor of 100 to 230 ° C. is supplied into the sealed container.
  • the first step of softening the material and the wood material softened in the sealed container while being taken out of the sealed container or after being taken out of the sealed container, perpendicular to the fiber direction of the softened wooden material And a second step of forming compressed wood by compression into a laminated wood.
  • the wood material may be softened by repeatedly performing the operation of supplying the water vapor into the sealed container by reducing the pressure in the sealed container in the first step.
  • the wooden material includes a plurality of logs or a plurality of divided logs, and the fiber directions thereof can be made parallel. Moreover, the said wood material can also be stacked in multiple steps so that the fiber direction may cross
  • any one or two of before placing the wooden material into the sealed container, after removing the wooden material from the sealed container, and when removing the wooden material from the sealed container it is preferable to apply, spray, or dispose the adhesive on the wooden material.
  • a thermoplastic resin or a thermosetting resin can be used as the component of the adhesive.
  • the first step and the second step are sequentially performed in a state where the holding jig is in contact with the outer periphery of the wooden material.
  • the holding jig can have a box that can store the wood material and a pressing lid that is fitted into the box with a slight gap.
  • the holding jig is bent at a right angle into an L shape, and a pair of molds arranged to face each other so that the inner surfaces thereof face each other, and a pair of molds are bent at a right angle into an L shape.
  • a pair of mold auxiliary tools that are slidably opposed to the pair of molds so that a space having a right-angled cross section is formed.
  • the compression of the wood material in the second step is preferably performed while conveying the wood material using a pair of compression rollers arranged to face each other with the wood material interposed therebetween.
  • the pair of compression rollers may be arranged in pairs or in plural pairs with an interval in the longitudinal direction of the wood material.
  • the compression of the wood material in the second step is performed while increasing the compression pressure on the wood material stepwise or continuously by a press machine disposed downstream of the sealed container. You can also.
  • the softening process of the wooden material is performed in the sealed container, and the compression process of the wooden material is performed outside the sealed container, so that the sealed container is compared with the case where both are continuously performed in the sealed container.
  • the processing time can be shortened, and the productivity can be improved.
  • the manufacturing method of the laminated lumber according to the present embodiment includes a first step of softening the wood material 10 (treated wood) in the sealed container 11, and the inside of the sealed container 11. A second step of taking out the wooden material 10 softened in step (or while taking out) and compressing it outside the sealed container 11 to form the compressed wood 12.
  • the laminated material can be manufactured with high productivity. This will be described in detail below.
  • the wood material 10 is composed of a plurality (here, ten) of long logs 13.
  • the log 13 has a length of, for example, about 5 m or less, and can be used with the bark peeled off as it is, but if necessary, for example, 5 to 15 m longitudinally connected using a finger joint or a scarf joint. It is also possible to use a medium of a degree.
  • the wood material is not limited to this, and a plurality (15 in this case) of half logs (an example of divided logs), that is, a half, like the wood material 10a shown in FIG.
  • the wood material can be constituted by a divided log obtained by dividing the log into a plurality of quarters or the like.
  • Examples of the log 13 for example, cypress, hiba, zelkova, cedar, bee cedar, larch, red pine, red pine, black pine, duflica larch , Bay Pine, Benimatsu, Todomatsu, Ezo Pine, Lawan, Southern Pine, Radiata Pine, Lodgepole Pine, Ponderosa Pine Beich, Batesga, Bay Fir, Tamo, Shioji, Elm, Itaya Maple, Hippopotamus, Beech, Apiton, Mizunara, Tsuga, Alaska Yellow Cedar, fir, spruce and the like can be used.
  • those that have low fastness and cannot be used as structural materials such as beams, such as soft materials such as cedar and cypress, and thinned small-diameter wood, have high strength and can be used as structural materials.
  • laminated wood added value can be increased.
  • the manufacturing method according to the present embodiment is suitable for timber having a relatively low specific gravity such as cedar, balsa, paulownia, falkata, etc., but depending on the application, a relatively high-density wood is further densified and strengthened. It can also be used as a processing technique.
  • the above-described wood material 10 is accommodated and fixed in the holding jig 16 so that the fiber directions (that is, the longitudinal direction) of the plurality of logs 13 are parallel to each other (for holding the wood materials 10a and 10b, respectively)
  • the holding jigs 16a and 16b having the same configuration and function as the jig 16 are used). If logs are cascaded, they are arranged so that the longitudinal positions do not overlap (for example, the longitudinal position is shifted by 30 cm or more).
  • the wood material 10c is composed of a plurality of logs 13a (which may be halved members 14) having substantially the same diameter, the fiber direction (that is, the longitudinal direction) of the plurality of logs 13a.
  • FIG. 3A the holding jig 16 is used to store the log 13a.
  • illustration of a side wall portion of a box 17 described later is omitted (FIG. 3 described later). The same applies to (B)).
  • the wood material 10d is composed of a plurality of long logs 13a having substantially the same diameter and a plurality of short logs 13b having substantially the same diameter (may be a half-cut material 14).
  • the holding jig 16 is accommodated as follows. First, a plurality (here, four) of logs 13a are arranged in parallel so that the fiber directions of the long logs 13a are parallel. Subsequently, the short log 13b is formed thereon so that the fiber direction (that is, the longitudinal direction) of the long log 13a is orthogonal (intersect) and the fiber direction of the short log 13b is parallel to the long log 13a. A plurality (13 in this case) are arranged.
  • a plurality of long logs 13a are arranged so that the fiber directions of the long logs 13a are orthogonal (intersect) with the short logs 13b and the fiber directions of the long logs 13a are parallel to each other (here, 4) Arrange.
  • the long log 13a and the short log 13b can be stacked in a plurality of stages (here, three stages).
  • the holding jig 16 is capable of accommodating the wood material 10 and has an open upper portion and a box 17 surrounded by walls on four sides (however, two or more sides may be used). And a pressing lid 18 that is fitted in the box 17 with a slight gap and can be placed on the housed wooden material 10. Since this holding jig 16 is in partial contact with the outer peripheral surface of the softened wood material 10 and maintains the softened state of the wood material 10, the heat capacity is large and the temperature drop can be suppressed (high temperature state can be maintained). However, a configuration in which a heat insulating material is attached to the outer surface of the holding jig may be used. When the wooden material 10 is accommodated in the holding jig 16, the clearance generated between the adjacent logs 13 is reduced. The gap can be filled with fine wood, wood chips or the like.
  • an adhesive for adhering adjacent logs 13 is applied or sprayed to a part or all of the outer peripheral surface of the logs 13.
  • coating or spraying of the adhesive agent to the outer peripheral surface of the log 13 takes out the wooden material 10 from the sealed container 11 after charging the wooden material 10 into the sealed container 11 (during the softening of the wooden material 10). It can also be performed at the time (after the softening of the woody material 10).
  • the adhesive can also be disposed on the outer peripheral surface of the log 13.
  • the adhesive component to be used includes a thermoplastic resin and a thermosetting resin.
  • the softened wood material 10 is compressed outside the sealed container 11 to form the compressed wood 12. Therefore, a thermoplastic resin is preferable.
  • thermoplastic resin for example, polyvinyl acetate or polyurethane adhesive can be used.
  • thermosetting resin examples include urea, melamine urea, phenol, resorcinol, and aqueous vinyl urethane, particularly low formaldehyde type aqueous polymer isocyanate.
  • PI bond (registered trademark) 4000 (manufactured by Oshika Chemitech Co., Ltd.), and P-3 bond curing agent H-3M (manufactured by Oshika Chemitech Co., Ltd.), a crosslinking agent for aqueous polymer isocyanate adhesives It is preferable to use a low-formaldehyde type tannin-based adhesive.
  • PI Bond 4000 is a milky white liquid that does not contain foreign matter, has a pH of 6.0 to 6.8, a viscosity of 0.5 to 3.0 Pa ⁇ s, and a non-volatile content of 52.0 to 56. 0% by mass.
  • the PI bond curing agent is a black liquid with no foreign matter mixed therein, and has a viscosity of 0.17 ⁇ 0.03 Pa ⁇ s and a specific gravity of 1.235 ⁇ 0.005.
  • the wood material 10 is placed in a sealed container 11 in a state of being housed in a holding jig 16, and the inside of the sealed container 11 is in a vacuum state (reduced pressure state: for example, 0.1 MPa or less, preferably 0.05 MPa or less, more preferably about 0.01 MPa or less), and then high-temperature and high-pressure steam is supplied into the sealed container 11 to soften it in a high-temperature and high-pressure environment.
  • the sealed container 11 has a cylindrical container main body 19.
  • a carry-in port 20 is provided on the upstream side in the longitudinal direction of the container main body 19, and a carry-out port 21 is provided on the downstream side in the longitudinal direction.
  • the container main body 19 includes a decompression means (not shown) for bringing the inside of the sealed container 11 into a vacuum state (depressurized state), and a steam supply pipe (not shown) for supplying high-temperature and further high-pressure steam into the sealed container 11. And a medicine supply pipe (not shown) for supplying medicine such as preservative into the sealed container 11 is connected.
  • the container body 19 includes a drain pipe (not shown) that discharges excess water vapor and chemicals in the sealed container 11 and an exhaust pipe (not shown) that adjusts the pressure in the sealed container 11 raised by the supplied water vapor. Not) is also installed.
  • the temperature of the water vapor supplied into the sealed container 11 is not higher than the carbonization temperature of the wood material 10 and is 100 to 230 ° C. (lower limit, preferably 130 ° C., more preferably 150 ° C., upper limit, preferably 200 ° C., more preferably 180 ° C.). This is because when the temperature of the water vapor is less than 100 ° C., the wood material is difficult to soften, and when it exceeds 230 ° C., the strength of the wood material is reduced or discoloration occurs.
  • the pressure of water vapor supplied into the sealed container 11 is 0.1 to 3 MPa (lower limit, preferably 0.12 MPa, more preferably 0.5 MPa, upper limit, preferably 2.5 MPa, more preferably 2 MPa).
  • At least 30 minutes to 1 hour is required for the softening process (critical path) at high temperature and pressure.
  • the vacuum state may contribute to the drying of the wood material 10. In this case, it is effective to confirm how much can be dried by vacuum drying through experiments and simulations. Based on the same principle that the boiling point is lowered when the atmospheric pressure is lowered, moisture is vaporized in a vacuum, and the same state as the state of vaporizing at 100 degrees or more can be created. However, the technique of “low temperature vacuum drying” has already been established. In a general method, heat is applied until the wood temperature in the drying kettle reaches about 70 ° C., and then the kettle is evacuated to lower the boiling point.
  • the wood material 10 absorbs water vapor and softens, and the wood is decomposed.
  • the operation of supplying the water vapor into the sealed container 11 with the inside of the sealed container 11 in a reduced pressure state may be repeated a plurality of times (for example, about twice or three times).
  • the wood material 10 can be charged in the sealed container 11 after being dipped in water in advance to increase the water content. Thereby, it becomes easy to soften the wooden material 10.
  • the application (or spraying or arrangement) of the adhesive to the wooden material 10 is performed before or after the softening in the sealed container 11 without being performed before the charging into the sealed container 11. You can also.
  • the wooden material 10 softened in the sealed container 11 is taken out from the sealed container 11 by opening the opening / closing lid 23. Then, immediately after that, that is, while the state in which the wood material 10 is softened is maintained, as shown in the right diagrams of FIG. 1 and FIG. Both are compressed perpendicular to the fiber direction of the softened woody material 10 in a low state, typically in an environment of normal temperature and normal pressure (atmospheric pressure). Thereby, the compressed wood 12 is formed.
  • a press machine (not shown) that presses the entire pressing lid 18 that is arranged on the downstream side of the sealed container 11 and is arranged in the box 17 of the holding jig 16 from above is used.
  • the compression of the wooden material 10 is preferably performed in a short time because the wooden material 10 is taken out from the sealed container 11 (the temperature of the wooden material 10 when compressing is, for example, 100 ° C. or more, and Below the temperature in the sealed container 11).
  • the wood material 10 it is preferable to compress the wood material 10 continuously at a stretch until the final compression pressure (compression thickness).
  • the wood material 10 is repeatedly compressed, for example, several mm, and held for several seconds.
  • the above-described press machine may be provided with a heating means. Thereby, for example, it is possible to suppress heat dissipation when the holding jig 16 comes into contact with the press, and temperature decrease of the holding jig 16 due to outside air.
  • the compression of the wooden material 10 may be performed on the extracted portion while taking out the softened wooden material 10 from the sealed container 11 without completely removing it from the sealed container 11 as described above. it can. In this case, it is preferable to increase the compression pressure stepwise from the upstream side in the longitudinal direction (closed container 11 side) of the wooden material 10 to the downstream side in the longitudinal direction.
  • the compression of the wood material 10 can be performed while the wood material 10 is being transported using a compression roller group 24 disposed on the downstream side of the sealed container 11.
  • the compression roller group 24 includes a plurality of rollers (an example of a compression roller) 25, and the rollers 25 are arranged in a vertically opposed manner with the wood material 10 interposed therebetween, and the longitudinal direction of the wood material 10 ( A plurality of pairs are arranged at intervals in the transport direction).
  • the holding jig 16c when the compression roller group 24 is used to compress the wood material 10, the holding jig 16c is used.
  • the holding jig 16c can be placed on the wood material 10 which is inserted into the box body 17 and the box body 17 with a slight gap and is accommodated in the box body 17, and its upper surface is a box.
  • a pressing lid 18a located above the upper end of the body 17;
  • the compression pressure is increased stepwise from the upstream side of the wooden material 10 in the longitudinal direction (closed container 11 side) to the downstream side in the longitudinal direction.
  • the box body 17 and the pressing lid 18a of the holding jig 16c are conveyed while being compressed by the pair of rollers 25, and the wood material 10 is compressed (clamped).
  • a pair of compression rollers arranged to face each other with the wooden material 10 interposed therebetween may be used for compressing the wooden material 10.
  • the wood material 10 is compressed by reciprocating the holding jig 16c a plurality of times with respect to the pair of compression rollers.
  • the compression pressure by the pair of compression rollers is preferably increased step by step each time the holding jig 16c passes through the pair of compression rollers.
  • the roller 25 described above can be provided with a heating means. Thereby, for example, heat dissipation when the holding jig 16c comes into contact with the roller 25 and temperature decrease of the holding jig 16c due to outside air can be suppressed.
  • the holding jig 26 shown in FIG. 4 (A) can be used instead of the holding jigs 16 and 16c.
  • the holding jig 26 includes a pair of molds 27 and 28 that are opposed to each other in the vertical direction, and a pair of mold auxiliary tools 29 and 30 that are disposed to be opposed to the left and right.
  • the pair of molds 27 and 28 are bent at a right angle into an L shape, and are arranged to face each other so that the inner surfaces of the molds 27 and 28 face each other.
  • the tip portions 33 and 34 are attached, and the molds 27 and 28 can be moved up and down in synchronization.
  • the pair of mold auxiliary tools 29 and 30 are also bent at right angles into an L shape, and the pair of molds 27 and 28 form a space 35 having a right-angled cross section. , 28 are slidably opposed to the inner surface.
  • the rods 33 and 34 of the fluid cylinders 31 and 32 protrude in the center direction, that is, the upper mold 27 is lowered to lower the lower mold.
  • each mold auxiliary tool 29, 30 slides in the center direction, and the space 35 formed by the pair of mold 27, 28 and the pair of mold auxiliary tools 29, 30 is reduced,
  • the compressed wood 12a can be formed by compressing the wood material 10e (the plurality of logs 13) disposed in the space 35.
  • a pair of molds 27 and 28 containing a wood material 10e and a pair of mold auxiliary tools 29, 30, and a pair of compression rollers 36, 37 opposed to each other on both sides thereof, and a pair of compression rollers 38, 39 opposed to each other vertically are arranged in the longitudinal direction (conveying direction) of the woody material 10e.
  • the wooden material 10e can be compressed substantially uniformly from the four sides (surroundings).
  • the compression of the wood material 10 is performed so that the cross-sectional area becomes, for example, about 1/3 to 2/3 (volume is about 1/3 to 2/3) (the wood material 10 has a specific gravity of about 1/3). (It can be compressed to 1.5.
  • the compression pressure is, for example, about 0.6 to 2.5 MPa.) This is because when the compression is made so that the cross-sectional area of the wooden material is less than 1/3, the force applied to the wooden material during compression becomes too large, while when the compression is made so that the cross-sectional area exceeds 2/3, the produced assembly This is due to the lower strength of the material.
  • the cross-sectional shape of the obtained compressed wood 12 is a square or a rectangle, and one side thereof is, for example, about 0.3 to 1.3 m.
  • the exit 21 of the airtight container 11 is closed with an opening / closing lid 23, and the opening / closing lid 22 provided at the entrance 20 is opened.
  • the wooden material to be processed is charged into the sealed container 11 and the first processing of the wooden material to be processed next is performed in parallel with the compression of the wooden material 10 (second step).
  • the first step and the second step are sequentially performed, so that the softened state (first fiber) is decomposed (first fiber).
  • the woody material (after completion of the process) can be mechanically compressed while maintaining its state.
  • part where the temperature of the woody material fell can also be heated by providing a heating means downstream from the airtight container 11. FIG. This compression is maintained until the compressed form of the compressed wood 12 is stabilized (the reaction force disappears). Thereby, the fine cavity part in a wooden material becomes small, and a density and intensity
  • hemicellulose and lignin contained in the wood are partially depolymerized to produce a phenol compound and a furfural compound.
  • These compounds have the property of inhibiting the growth of basidiomycetous basidiomycetes, and can improve the durability of woody materials against wood-rotting fungi.
  • the compressed wood 12 manufactured by the above method is dried at room temperature or in a dryer, and then surface-finished or processed as necessary, and used as a laminated material.
  • the case where the wood material is accommodated in the holding jig 16 and the first step and the second step are sequentially performed has been described.
  • the present invention is not limited to this.
  • several logs woody materials
  • the first step is performed.
  • the softened logs are taken out from the sealed container one by one and an adhesive is applied.
  • a plurality of logs can be accommodated in, for example, the holding jig 16 to perform the second step.
  • the holding jig 16 may be heated in the above-described sealed container, or may be heated using an electric furnace or the like.
  • the case where the compressed wood 12 was manufactured using the some log 13 as the wooden material 10 was demonstrated.
  • a single log 13 is used as the wood material, and the compressed wood is manufactured by sequentially performing the above-described first and second processes on the log 13 and then using a plurality of the compressed wood (multiple Prepared), the fiber directions may be made parallel to each other and bonded with an adhesive, and the above-described first step and second step may be sequentially performed using this as a woody material. That is, the adhesive is applied before the wooden material 10 is loaded into the sealed container 11, after the wooden material 10 is taken out from the sealed processing container 11, and when the wooden material 10 is taken out from the sealed container 11. Either may be performed.
  • the laminated lumber produced by this embodiment can use thinned wood with a small diameter as a material for large pillars, beams and outer walls, floor boards, flooring, etc. It is difficult to enter and can be expected to slow down the decay, and can be used for outdoor decks. Furthermore, since compressive strength increases by compression, it can be used for foundations, wooden block bricks, and the like, and by controlling the compression rate, it is possible to provide timber of various densities. Cedar can produce timber with a specific gravity from 0.39 to 1.1.
  • the softening process of the wood material is performed in the sealed container 11, and the compression process of the wooden material is performed outside the sealed container 11, both are continuously performed in the same sealed container. Compared to the case, the time required for processing in the sealed container 11 can be shortened, and productivity can be improved. Further, since the compression of the wooden material is performed outside the sealed container 11, a compression mechanism can be omitted from the sealed container 11, which contributes to cost reduction of the apparatus. In addition, as an apparatus which produces
  • the production efficiency (softening efficiency) of the laminated wood can be improved without complicating the manufacturing apparatus (for example, an existing autoclave can be used for softening the wood material).
  • Mass production of materials is possible.
  • the inside of the sealed container charged with the wood material is brought into a reduced pressure state, so that the cells of the wood material can be expanded. Since high-temperature water vapor is supplied into the sealed container, the water vapor is attracted by the cellular contraction of the wood material in addition to the jet power, so that heat passes through the wood material, and the wood material Can be softened in a short time.
  • the cell membrane of the woody material can be destroyed or damaged by repeatedly performing the operation of reducing the pressure in the sealed container and supplying the water vapor in the first step several times. Water vapor can penetrate.
  • the wood material includes a plurality of logs or a plurality of divided logs, the processing cost for making the log into a drawing plate or a square is not required as in the conventional case, and the manufacturing cost can be reduced.
  • the laminated lumber is processed into a lamina (plate material) at the time of manufacture, and the yield is poor because a process of taking a knot or a finger joint of a cascade is performed. It is said that the yield from domestic logs is 30-38%.
  • the log is formed as it is without making lumber, and is made into square, so that the yield can be increased and the cost for lumber can be reduced.
  • heat since heat is used for softening, the cost for that increases.
  • the use of log materials can reduce the cost of raw material production. Further, it is possible to use an inexpensive curved material regardless of the direct material. If it is a log imported material, there is a possibility that a cheaper material can be obtained. However, it is better to use a rod-shaped material for the stability of the quality of the material (even if the same material is sparse and dense, the strength and quality vary).
  • the adhesive the log material has a reduced adhesion area as a whole, which reduces the cost and facilitates the adhesive application process.
  • the present invention has been described above with reference to the above-described embodiment.
  • the present invention is not limited to the configuration exemplified as the present embodiment, and can be considered within the scope of the matters described in the claims.
  • Other embodiments and modifications are also included.
  • a case where the method for producing a laminated material of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
  • the wood material may be configured by combining any two or more of the above-described logs, half-divided materials (divided logs), square materials, and ground plates.
  • the first step and the second step are sequentially performed using a holding jig having a box that can store a wooden material and a pressing lid.
  • the wooden material can be held. If it is a simple structure, other holding jigs can be used, and if necessary, a plurality of logs can be fixed integrally to hold a wood material without using a holding jig. it can.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

Le problème décrit par la présente invention est d'améliorer l'efficacité de production de bois stratifié sans accroître la complexité d'un appareil de fabrication. La solution de la présente invention porte sur un procédé comprenant : une première étape dans laquelle un matériau ligneux (10) est chargé dans un récipient hermétique (11) dans lequel le matériau ligneux (10) peut être chargé, l'intérieur du récipient hermétique (11) est dépressurisé, de la vapeur à une température de 100 à 230 °C est ensuite introduite dans le récipient hermétique (11), et le matériau ligneux (10) est ramolli ; et une seconde étape dans laquelle le matériau ligneux (10) ramolli à l'intérieur du récipient hermétique (11) est comprimé dans une direction perpendiculaire à la direction des fibres du matériau ligneux ramolli (10) soit pendant que le matériau ligneux (10) est retiré de l'intérieur du récipient hermétique (11) ou après que le matériau ligneux (10) est retiré de l'intérieur du récipient hermétique (11), et le bois comprimé (12) est formé.
PCT/JP2017/024001 2016-07-01 2017-06-29 Procédé de fabrication de bois stratifié WO2018003935A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113478599A (zh) * 2021-07-28 2021-10-08 南京林业大学 一种木材密实化的方法及密实化设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0197674A1 (fr) * 1985-03-15 1986-10-15 Peter Favot Procédé pour densifier des bois de basse densité
JPH03180301A (ja) * 1989-12-08 1991-08-06 Shigeru Yoshihara 木材の曲げ加工方法
JP2001026005A (ja) * 1999-07-13 2001-01-30 Tesac Corp 柱状圧縮集合木材の製造方法及び柱状圧縮集合木材
JP2008044314A (ja) * 2006-08-21 2008-02-28 Nobuatsu Fukuda 高強度集成材及びその製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0197674A1 (fr) * 1985-03-15 1986-10-15 Peter Favot Procédé pour densifier des bois de basse densité
JPH03180301A (ja) * 1989-12-08 1991-08-06 Shigeru Yoshihara 木材の曲げ加工方法
JP2001026005A (ja) * 1999-07-13 2001-01-30 Tesac Corp 柱状圧縮集合木材の製造方法及び柱状圧縮集合木材
JP2008044314A (ja) * 2006-08-21 2008-02-28 Nobuatsu Fukuda 高強度集成材及びその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113478599A (zh) * 2021-07-28 2021-10-08 南京林业大学 一种木材密实化的方法及密实化设备

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JPWO2018003935A1 (ja) 2019-04-25

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