JP2017019177A - Manufacturing method for compressed lumber, compressed lumber, and cut plate produced by cutting compressed lumber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a compressed lumber with rigidity, workability, and lightness required in a smaller number of man-hour, a compressed lumber, and a cut plate produced by cutting the compressed lumber.SOLUTION: In a manufacturing method for a compressed lumber having a heating compression process for compressing a lumber on heating, a lumber is a cut lumber having an outer peripheral face 1a of raw wood of the lumber and a cut face (counter face 1b and both side faces 1c, 1c) nearly parallel to the axial direction of raw wood, and the heating compression process is characterized by being performed by applying pressing force to a cut lumber from the outer peripheral face side and the counter face side. This makes the cut face after heating compression leave a constant workability and lightness as compared with the outer peripheral face while the outer peripheral face having a bark sublayer after heating compression largely increases rigidity because heating compression is performed by applying pressing force to a cut lumber from the outer peripheral face side and the counter face side. Further, since the necessity of a work for combining a plurality of lumbers different in rigidity is eliminated, a compressed lumber can be obtained in a smaller number of man-hour with a reduction in the man-hour.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a compressed wood manufacturing method for compressing wood by heating, compressed wood, and a cutting plate material obtained by cutting the compressed wood.

  Conventionally, conifers such as cedar grow fast but have a small specific gravity and may be soft, and when used in furniture, etc., the surface is likely to be scratched, and when used as building materials, there is a risk of insufficient strength, etc. There was a bug.

  Therefore, as shown in Patent Document 1, it has been conventionally performed to increase the strength of wood by compressing wood such as conifers. Specifically, a prism that has been processed by pressing the outer peripheral surface of a raw tree from four sides with or without removing the bark of the tree is disclosed.

  According to Patent Document 1, a prism having a strength that can be used as, for example, a two-by-four frame material can be obtained from a low-strength wood such as a cedar thinning material.

  Further, Patent Document 2 discloses a laminated material obtained by bonding a compressed surface layer material and an uncompressed inner layer material. According to the laminated material of Patent Document 2, when applied to a floor board material, it becomes possible to give the surface layer material sufficient strength by compression processing, while the adjacent laminated materials are arranged on the side surface of the inner layer material. The process which provides the recessed part and convex part which can be connected can be performed easily.

JP-A-9-85713 JP 2003-205503 A

  However, since the prisms of Patent Document 1 are processed by pressing from four directions, the density increases and becomes a very heavy material. In addition, the prism of Patent Document 1 is an excellent building material with high strength on the outer peripheral surfaces of the four sides, but the workability is reduced because of the high strength. That is, when such a prism is used, for example, as a top plate of a learning desk, the top surface of the top plate is hard to be scratched and has an excellent hardness, but there is a problem that wood screws are difficult to enter on the back surface of the top plate. . There is a similar problem when the prism of Patent Document 1 is applied to a floor board.

  Moreover, according to the laminated material of patent document 2, while the surface layer material which carried out the compression process has sufficient hardness as a floor board material, there exists an advantage that the side surface and lower surface of an inner layer material are lightweight and easy to process. However, after compressing the wood used as the surface material, it is necessary to bond the compressed wood and uncompressed wood together, which complicates the process.

  The present invention has been made in view of the above problems, and an object of the present invention is to produce a compressed wood having the hardness, lightness, and workability required in a smaller number of man-hours, the compressed wood, and cutting the compressed wood. It is in providing the cutting board material which becomes.

  In order to achieve the above object, the invention according to claim 1 is a method for producing a compressed wood having a heating and compressing step of heating and compressing the wood, wherein the wood comprises an outer peripheral surface of the raw wood of the wood and an axis of the raw wood. A cutting wood having a cutting surface substantially parallel to the direction, wherein the heating and compressing step is performed by applying a pressing force to the cutting wood from at least the outer peripheral surface side.

  According to this configuration, the cut wood has a dendritic layer that is the hardest layer in the raw wood below the outer peripheral surface, and heat compression is performed by applying a pressing force to the cut wood from at least the outer peripheral surface side. Since the outer peripheral surface having the subsequent subcutaneous layer is further increased in hardness, the resulting compressed wood has an extremely high outer peripheral surface having the dendritic layer, whereas the cut surface after heat compression is compared with the outer peripheral surface. This will leave a certain workability. Further, since the surface other than the outer peripheral surface does not have a dendritic layer that has been pressed and has a higher density, the weight of the compressed wood is maintained as a whole.

  Moreover, since such compressed wood is obtained by heating and compressing the cut wood, it is not necessary to combine a plurality of woods having different hardnesses. Therefore, the number of man-hours is reduced, and the high hardness, lightness and constantness are reduced with less man-hours. Compressed wood having the processability can be obtained.

  Invention of Claim 2 has the peeling process which peels the bark of the said outer peripheral surface of the said cutting wood in the manufacturing method of the compressed wood of Claim 1 before the said heating compression process, It is characterized by the above-mentioned. .

  According to this configuration, the bark on the outer peripheral surface of the cut wood is peeled off before the heat compression step, so that the surface of the subcutaneous layer is not pressed against the upper bark during the heat compression, and the uneven surface is not formed. There is no need to flatten. Therefore, man-hours are further reduced and compressed wood can be obtained with fewer steps.

  The invention according to claim 3 is the compressed wood manufacturing method according to claim 1 or 2, wherein the cut surface is opposed to the outer circumferential surface of the raw wood, and the opposed surface and the outer circumferential surface. It is characterized by comprising both side surfaces respectively located on the side portions of.

  According to this configuration, the compressed wood obtained after the heat compression step is a plate material having a substantially rectangular cross section composed of an outer peripheral surface having a dendritic layer having very high hardness and three cut surfaces (opposing surface and both side surfaces). Therefore, while having the hardness required in the outer peripheral surface having the dendritic layer, the other three cut surfaces have a predetermined workability, and it is possible to produce a compressed wood having a higher workability.

  At the same time, since the dense dendritic layer is only one surface of the outer peripheral surface, the weight of the whole compressed wood is further reduced.

  Invention of Claim 4 is a manufacturing method of the compressed wood of any one of Claims 1-3. WHEREIN: The said heat compression process uses the compression type | mold which compresses wood between two opposing press surfaces. Of the two opposing press surfaces, the press surface facing the outer peripheral surface is a concave / convex press surface having a concave / convex portion for bending an annual ring of the cut wood near the outer peripheral surface into a waveform. It is characterized by that.

  According to this configuration, in the heat compression process, the uneven pressing surface facing the outer peripheral surface of the cut wood abuts on the outer peripheral surface and the cut wood is compressed, so that an uneven shape portion is generated on the outer peripheral surface of the cut wood, and the outer peripheral surface A compressed wood having a corrugated grain formed by bending the annual rings of nearby cut wood into a corrugated shape is obtained.

  Thereafter, when cutting from the outer peripheral surface side of the compressed wood so that the bent annual rings are exposed, it is possible to obtain a cutting plate material having a grain pattern extending substantially parallel to the axial direction of the compressed wood on the outer peripheral surface after cutting. it can.

  Therefore, in this case, it is possible to obtain a cutting plate material that exhibits a beautiful wood pattern similar to a checkerboard pattern on the cut surface by a simple operation of cutting the outer peripheral surface until the bent annual rings are exposed.

  The invention according to claim 5 is a compressed wood obtained by heating and compressing wood, wherein the wood has an outer peripheral surface of the raw wood of the wood and a cutting surface substantially parallel to the axial direction of the raw wood. It is wood, and the heat compression is performed by applying a pressing force to the cut wood from at least the outer peripheral surface side.

  According to this configuration, the cut wood has a dendritic layer that is the hardest layer in the raw wood below the outer peripheral surface, and heat compression is performed by applying a pressing force to the cut wood from at least the outer peripheral surface side. Since the outer peripheral surface having the subsequent subcutaneous layer is further increased in hardness, the resulting compressed wood has an extremely high outer peripheral surface having the dendritic layer, whereas the cut surface after heat compression is compared with the outer peripheral surface. This will leave a certain workability. Further, since the surface other than the outer peripheral surface does not have a dendritic layer that has been pressed and has a higher density, the weight of the compressed wood is maintained as a whole.

  Moreover, since such compressed wood is obtained by heating and compressing the cut wood, it is not necessary to combine a plurality of woods having different hardnesses. Therefore, the number of man-hours is reduced, and the high hardness, lightness and constantness are reduced with less man-hours. The above-mentioned compressed wood having the workability of can be obtained.

  The invention according to claim 6 is the compressed wood according to claim 5, wherein the heat compression has an uneven press surface having an uneven portion for bending an annual ring of the cut wood in the vicinity of the outer peripheral surface into a waveform. The uneven shape portion corresponding to the uneven press surface remains on the outer peripheral surface of the cut wood by being performed using a compression die that compresses wood between the press surface facing the press surface. To do.

  According to this configuration, the concave and convex shape portion remains on the outer peripheral surface of the cut wood by compressing the cut wood by pressing the concave and convex press surface facing the outer peripheral surface of the cut wood during heat compression, A compressed wood having a corrugated grain formed by bending the annual rings of the cut wood near the outer peripheral surface into a corrugated shape is obtained. After that, when cutting from the outer peripheral surface side so as to expose the annual rings that are bent on the concave-convex shape portion remaining on the outer peripheral surface of the compressed wood, a grain pattern extending substantially parallel to the axial direction of the compressed wood is formed on the cutting surface. The cutting board material to exhibit will be obtained.

  Therefore, in this case, it is possible to obtain a cutting plate material that exhibits a beautiful wood grain pattern similar to a grid pattern on the cutting surface by a simple operation of cutting the concavo-convex shape portion from the outer peripheral surface side after heat compression.

  According to a seventh aspect of the present invention, there is provided the cutting plate material according to the sixth aspect, wherein the uneven portion of the compressed wood according to the sixth aspect is cut from the outer peripheral surface side so that the bent annual rings are exposed.

  According to this configuration, the cutting plate material that exhibits a beautiful grain pattern similar to a checkerboard pattern on the cutting surface is obtained by a simple operation of cutting the uneven shape portion remaining on the outer peripheral surface of the compressed wood after heat compression from the outer peripheral surface side. Can be obtained.

  According to the present invention, the surface of the obtained compressed wood having the dendritic layer has extremely high hardness, while the cut surface after heat compression leaves a certain workability compared to the surface having the dendritic layer. Become. Further, since the surface other than the outer peripheral surface does not have a dendritic layer that has been pressed and has a higher density, the weight of the compressed wood is maintained as a whole. In addition, since compressed wood is obtained by heat compression processing of cut wood, it is not necessary to combine multiple woods with different hardnesses. Therefore, man-hours are reduced and high hardness, lightness and constant workability with fewer man-hours. Compressed wood with can be obtained.

It is a perspective view which shows the cut wood used for the manufacturing method of the compressed wood which concerns on 1st Embodiment of this invention. It is a front view which shows a heating compression process typically. It is a front view which shows a cutting process typically. It is a perspective view which shows the cutting board material formed by cutting compressed wood. It is a longitudinal cross-sectional view which shows typically the compression apparatus of wood. It is a perspective view which shows the press plate for forming the uneven | corrugated press surface in which the uneven | corrugated | grooved part was provided in the press surface. It is a perspective view which shows the compressed wood which concerns on 2nd Embodiment of this invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
A manufacturing method of compressed wood, a compressed wood, and a cutting plate material obtained by cutting the compressed wood according to the present embodiment will be described with reference to FIGS. FIG. 1 is a perspective view showing a cut wood used in the method for producing compressed wood according to the first embodiment of the present invention, FIG. 2 is a front view schematically showing a heating compression process, and FIG. 3 is a schematic view of the cutting process. FIG. 4 is a perspective view showing a cutting plate material obtained by cutting compressed wood, FIG. 5 is a longitudinal sectional view schematically showing a wood compression device, and FIG. 6 is an uneven surface provided with uneven portions on the press surface. It is a perspective view which shows the press board for forming a press surface.

  First, before going into the description of the compressed wood manufacturing method, the compressed wood, and the cutting plate material obtained by cutting the compressed wood, the wood compression apparatus 50 used in the wood heating and compression step described later will be described.

  As shown in FIG. 5, the wood compression apparatus 50 includes a box-shaped lower mold 52 having a bottom surface 52 a on which wood is placed and an open top surface, and a plate constituting a lid portion of the lower mold 52. A basic structure including a compression mold 56 formed of an upper mold 54. The upper die 54 is movable in a direction in which the upper die 54 is in contact with and away from the lower die 52 (in the direction of the arrow 150). As shown by the broken line in FIG. Thus, a sealed mold space 58 is formed.

  A press plate 40 can be attached to the lower surface 54a of the upper mold 54 to form an uneven portion on the upper surface of the compressed wood.

  As shown in FIG. 6, the press plate 40 has a configuration in which a plurality of protrusions 40 b having a substantially circular cross section are arranged substantially parallel to the press surface 40 a. Therefore, the press surface 40a on which the protrusions 40b are arranged is an uneven press surface provided with uneven portions. The bottom surface 52a of the lower mold 52 is the other press surface facing the press surface 40a (uneven press surface), and the wood is compressed between the press surfaces.

  The diameter of the protrusion 40b is in the range of 2 mm to 5 mm, for example, 3 mm. Moreover, the space | interval of a protrusion is 3 mm-15 mm, for example, is 5 mm. The press plate 40 is attached to the upper die 54 with the flat surface 40 c abutting against the lower surface 54 a of the upper die 54.

  The upper mold 54 is provided with a pipe line 62 through which a steam 60 described later and a pipe 66 through which cooling water 64 described below are circulated, and the lower mold 52 is provided with a pipe 68 through which the steam 60 flows and cooling. A conduit 70 through which the water 64 flows is provided. Further, the lower mold 52 discharges water in the mold space 58, a pipe line 72 for introducing the steam 60 into the mold space 58, a pipe line 74 for discharging the steam 60 from the mold space 58, and the mold space 58. A conduit 76 is provided.

  Upstream of the upper mold 54 and the lower mold 52 are provided a pipe line 62, a pipe line 68 and a steam system path 78 for introducing the steam 60 into the pipe line 72, and downstream of the upper mold 54 and the lower mold 52. Are provided with a steam path 80 for discharging the steam 60 from the pipe line 62, the pipe line 68, and the pipe line 74.

  Further, upstream of the upper mold 54 and the lower mold 52, a cooling water system path 82 for introducing the cooling water 64 into the pipeline 66 and the pipeline 70 is provided, and downstream of the upper mold 54 and the lower mold 52. Is provided with a drainage channel 84 for discharging drainage from the pipeline 66, the pipeline 70 and the pipeline 76.

  The steam path 78 upstream of the compression mold 56 is provided with valves 86, 90, and 88 that can open and close the paths before reaching the pipe lines 62, 72, and 68, respectively. 80 is provided with valves 92, 94, and 96 that can open and close the paths downstream of the pipes 62, 74, and 68, respectively.

  The cooling water path 82 upstream of the compression mold 56 is provided with valves 98 and 100 that can open and close the paths before reaching the pipe lines 66 and 70, respectively, and the drainage path 84 downstream of the compression mold 56. Are provided with valves 102, 104 and 106 which can open and close the paths downstream of the pipes 66, 76 and 70, respectively. A pressure gauge 108 is provided between the valve 90 and the pipe line 72.

  The wood that is heated and compressed in the wood compression apparatus 50 is a cut wood 1 of conifers. As shown in FIG. 1, the cut wood 1 has an opposing surface 1b (cut surface) facing the outer peripheral surface 1a, an opposing surface 1b, and an outer peripheral surface 1a while leaving an outer peripheral surface 1a with a bark of a conifer raw tree. The cut wood 1 is obtained by cutting the raw wood so that both side surfaces 1c and 1c (cut surfaces) located on the sides of the wood are formed.

  Hereinafter, the compressed wood manufacturing method and the compressed wood 10 according to the present embodiment will be described.

[1. Peeling process]
First, the bark is removed from the outer peripheral surface 1 a of the cut wood 1. For the removal of the bark, sickle, scissors, spatula, etc. can be used as appropriate, and the bark can be removed by the water pressure of a planar or high pressure washer.

[2. Heat compression process]
2-1. Heat softening treatment Next, the cut wood 1 with the bark peeled is steamed and softened. Steaming can be performed using, for example, a steaming can. For example, the cooking time can be 60 to 150 ° C. for about 30 minutes.

2-2. Cut Wood Placement Operation As shown in FIG. 2 (a), the cut wood 1 after cooking is placed so that the opposing surface 1b contacts the bottom surface 52a of the compression mold lower mold 52 of FIG. In this state, the outer peripheral surface 1a of the cut wood 1 is opposed to the press surface 40a of the press plate 40 attached to the upper die 54, and the extending direction of the ridges 40b of the press plate 40 is arranged. Is substantially parallel to the axial direction (cutting wood placement operation).

2-3. Convex / concave portion forming operation Steam is sent to the upper die 54 and the lower die 52 to raise the temperature of the upper die 54 and the lower die 52. The temperature increase is performed until the temperature of the upper mold 54 and the lower mold 52 reaches about 110 to 130 ° C., and is maintained constant at that temperature.

  This temperature rise closes the valves 92 and 96 downstream of the compression die 56, opens the valves 86 and 88 upstream of the compression die 56 little by little, and introduces the high-temperature steam 60 into the upper die 54 and the lower die 52 little by little. (See FIG. 5). In order to make the temperature constant, the opening amounts of the valves 86 and 88 for sending the steam 60 and the opening amounts of the valves 92 and 96 for discharging the steam 60 are adjusted.

After the upper mold 54 and the lower mold 52 are heated, the upper mold 54 is moved in the direction close to the lower mold 52 (the direction of the arrow 200 in FIG. 2A), and the press of the press plate 40 attached to the upper mold 54 is performed. The surface 40a is brought into contact with the upper edge portion of the lower mold 52 (see FIG. 2B). Thereby, a pressing force is applied to the cut wood 1 from the outer peripheral surface 1a side and the opposed surface 1b side in the heated state.
In the present embodiment, since the cut wood 1 is sufficiently softened by the heat softening process using the steaming can in the “2-1. Heat softening process”, the press surface 40a from the start of the movement of the upper mold 54. It can be performed in a short time of about 2 to 6 minutes until it comes into contact with the upper edge of the lower mold 52.

  Further, by closing the valves 90, 94 and 104 in a state where the press surface 40a of the upper die 54 is in contact with the upper edge portion of the lower die 52, the inner space 58 becomes a completely sealed space. In this state, the upper mold 54 and the lower mold 52 are further heated to about 150 ° C. to 180 ° C. and maintained at a high temperature for about 70 to 120 minutes from the start of the temperature increase.

  Then, the pressure in the mold space rises due to the thermal expansion of air in the mold space 58 and the generation of water vapor due to the evaporation of moisture in the cut wood 1, and the compressed wood is subjected to a high-temperature steam treatment under this elevated pressure. It will be. Thereby, the stress accumulated in the cut wood 1 is remarkably relaxed in a short time, the compressed shape is fixed, and the concavo-convex shape portion 10b formed by the protrusion 40b of the press plate 40 biting into the upper surface 10a. A compressed wood 10 having the following is obtained (see FIG. 3).

When the amount of water vapor is insufficient only by the evaporation of moisture from the cut wood 1, and when the pressure in the mold space 58 is low, the opening amount of the valve 90 can be increased, and the amount of steam and pressure can be increased. When the pressure is high, the valve 94 can be slightly opened to adjust the pressure.
However, in this Embodiment, since the water | moisture content of the cut wood 1 has increased by the heat softening process using the steaming can in the said "2-1. Heat softening process", it is high temperature by the evaporation of the water | moisture content from wood. In most cases, the amount of water vapor necessary for the water vapor treatment is satisfied.

  Note that the pressure in the mold space 58 can be monitored by the pressure gauge 108.

  The compression rate of the cut wood 1 can be adjusted by the thickness of the cut plate 1 before compression, the thickness of the press plate 40, and a flat metal plate (not shown) that can be placed on the bottom surface 52a of the lower mold 52. Yes, up to about 70% can be performed if conifers are used as the raw wood. The compression rate of 70% means that a cut wood having a thickness of 10 cm is compressed to a thickness of 3 cm. In addition, when the compressed wood has the uneven portion 10b as in the compressed wood 10 described later, the compression rate may be measured based on the thickness of the compressed wood in the concave portion, and the thickness of the compressed wood 10 in the convex portion. You may measure on the basis of thickness. The compression rate is preferably large from the viewpoint of improving the hardness of the outer peripheral surface 1a, but from the viewpoint of leaving a certain workability on the cut surface, the compression rate is in the range of 10% to 60%, preferably 20 % To 50%, particularly preferably 30 to 45% (above, heat compression operation).

2-4. Cooling process Then, the temperature of the upper mold | type 54 and the lower mold | type 52 is lowered | hung to about 20-40 degreeC, and it maintains for 30 to 60 minutes, and cools the compressed wood to which the compression shape was fixed. For cooling, the valves 86 and 88 are closed, the valves 92, 94 and 96 are opened to discharge the steam 60 from the upper mold 54, the lower mold 52 and the mold inner space 58, and the valves 98, 100, 102 and 106 are opened. The cooling water 64 is circulated through the upper mold 54 and the lower mold 52. Thereafter, the upper die 54 is moved in a direction away from the lower die 52 (the heat compression step).

  The obtained compressed wood 10 has the uneven | corrugated shaped part 10b formed in the upper surface 10a, both side surface 10d, 10d, and the bottom face 10e as mentioned above.

  Therefore, according to the compressed wood manufacturing method and the compressed wood 10 according to the present embodiment, the cut wood 1 has a subcutaneous layer which is the hardest layer in the raw wood under the outer peripheral surface 1a. The outer peripheral surface 1a having the dendritic layer after heat compression is further increased in hardness by being applied with a pressing force from the outer peripheral surface 1a side and the opposing surface 1b side, and the obtained compressed wood 10 While the outer peripheral surface 1a (10a) has extremely high hardness, the cut surfaces (opposing surface 1b (10e), both side surfaces 1c, 1c (10d, 10d)) after heat compression are compared with the outer peripheral surface 1a (10a). This will leave a certain workability. Moreover, since the surfaces other than the outer peripheral surface 1a do not have the dendritic layer that has been pressed and has a higher density, the weight of the compressed wood 10 is maintained as a whole.

  In addition, since the compressed wood 10 is obtained by heating and compressing the cut wood 1, it is not necessary to combine a plurality of woods having different hardnesses. Therefore, the number of man-hours is reduced, and the high hardness and lightness are achieved with less man-hours. And the compressed wood 10 provided with fixed workability can be obtained.

Further, the compressed wood 10 obtained after the heat compression step has an outer peripheral surface 1a (10a) having a dendritic layer having very high hardness and three cut surfaces (opposing surface 1b (10e) and both side surfaces 1c, 1c (10d). , 10d)), the other three cut surfaces have predetermined workability while having the required hardness in the outer peripheral surface 1a having the dendritic layer. It becomes possible to produce a compressed wood rich in properties.
At the same time, since the dense dendritic layer is only one surface of the outer peripheral surface 1a, the weight of the entire compressed wood 10 is further reduced.
Moreover, as shown in FIG. 1, since it is possible to use what is called a core removal material as the cutting wood 1 used for this Embodiment, according to this Embodiment, the core support material is used as the pillar material from the raw wood of the conifer. It is possible to produce high-value-added compressed wood having high surface hardness, predetermined workability and lightness from the remaining bark material of conifers such as cedar.

  Next, the cutting plate material 20 formed by cutting the compressed wood 10 according to the present embodiment will be described. In order to obtain the cutting plate material 20, the following cutting process is further performed on the compressed wood 10.

[3. Cutting process]
As shown in FIG. 3, the compressed wood 10 with the compressed shape fixed has an uneven shape portion 10 b composed of a recessed portion that is a trace of the protrusion 40 a in the upper surface 10 a and a protruding portion formed between adjacent recessed portions. Have. Therefore, in the vicinity of the upper surface 10a, as shown in the figure, a corrugated portion 11a is distorted downward below the concave portion, and a ridge portion 11b is distorted upward below the convex portion, thereby forming a waveform. A corrugated grain 12 represented as a set of curved annual rings 11 is formed.

  This compressed wood 10 is cut from the upper surface 10a side to the AA line shown in the figure, that is, until the concavo-convex shape portion 10b disappears. That is, cutting is performed with a thickness of 2 mm to 5 mm that substantially corresponds to the diameter of the protrusion 40 b of the press plate 40. Cutting can be appropriately performed using a cutting board or the like (the cutting process).

  As described above, the cutting plate 20 is manufactured by cutting the upper surface 10a of the compressed wood 10 until the uneven portion 10b disappears. As shown in FIG. 4, the cutting plate member 20 is a plate member having a substantially rectangular shape in cross section, which includes a substantially flat flat upper surface 20a, a facing surface 20b facing the flat upper surface 20a, and both side surfaces 20c, 20c.

  On the flat upper surface 20a, the peak portion 11b of the annual ring forming the corrugated wood 12 is cut to the extending direction plane of the corrugated wood (that is, the extending direction plane of the AA line shown in FIG. 3). As shown in FIG. 4, a grain pattern extending substantially parallel to the axial direction of the cutting plate material 20 appears.

  Therefore, the peak portion 11b of the annual ring 11 that forms the corrugated grain 12 is cut out of the convex portion of the concave and convex portion 10b generated on the outer peripheral surface 1a (10a) of the compressed wood 10 after heat compression until the concave and convex portion 10b disappears. With this simple operation, it is possible to obtain the cutting plate material 20 that exhibits a beautiful grain pattern similar to the grid pattern on the flat upper surface 20a.

  In the present embodiment, the press plate 40 for forming the concavo-convex shape portion is attached to the upper surface of the wood to be compressed to the lower surface 54a of the upper mold 54 of the wood compression device 50, but the present invention is not limited to this. Instead of this, another configuration can be adopted.

(Second Embodiment)
Hereinafter, a method for manufacturing compressed wood and compressed wood according to the second embodiment of the present invention will be described mainly with respect to the differences from the first embodiment with reference to FIG. FIG. 7 is a perspective view showing a compressed wood according to the second embodiment of the present invention. It should be noted that the same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the press plate 40 is not attached to the upper die 54 of the wood compression device 50, and the flat lower surface 54a of the upper die 54 directly constitutes a contact surface with the wood. Is different.

  Therefore, in the method for manufacturing compressed wood according to the present embodiment, [2. Instead of “2-3. Concavity and convexity portion forming operation” in “Heat compression step”, the upper lower flat surface 54a is moved in the direction approaching the upper edge of the lower die 52, and the outer periphery of the cut wood 1 A compression operation for compressing the cut wood 1 by applying a pressing force from the surface 1a side and the facing surface 1b side is performed.

  And the compressed wood 30 concerning this Embodiment will be manufactured by performing "2-4. Cooling process" after compression operation | movement.

  As shown in FIG. 7, the obtained compressed wood 30 is a plate material having a substantially rectangular cross-sectional view, which is composed of a flat upper surface 30 a, opposed surfaces 10 b, and opposite side surfaces 10 c and 10 c.

  Since the upper surface 30a is an upper surface formed by compressing the outer peripheral surface 1a with the bark peeled off as it is, the upper surface 30a has a simple design in which a wood grain pattern due to annual rings does not appear.

  Therefore, also according to the present embodiment, an extremely hard outer peripheral surface 1a (30a) having a dendritic layer, a cut surface (opposing surface 10b and both side surfaces 10c, 10c) and lightness that retains a certain workability even after heat compression. The compressed wood 30 provided with can be obtained with less man-hours.

  Further, the bark of the outer peripheral surface 1a of the cut wood 1 is peeled off before the heat compression step, so that the surface of the subcutaneous layer is not pressed against the upper bark during the heat compression, and the uneven surface is made flat. There is no need to perform processing. Therefore, the number of man-hours is further reduced, and the compressed wood 30 can be obtained with fewer steps.

  Since the compressed wood according to the embodiment of the present invention has an extremely hard outer peripheral surface having a pressed dendritic layer, a desk top plate or the like that has used a melamine decorative board or the like because high strength is required. Can be used for school and public facilities equipment, especially requiring high hardness.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, in the present embodiment, the cut wood 1 is one having an outer peripheral surface 1a and three cut surfaces (opposing surface 1b and both side surfaces 1c, 1c), but is not limited thereto. . For example, an arcuate outer peripheral surface 1a and a cut wood having a cross-sectional shape with one cut surface as a chord may be used, or a cross-section substantially ginkgo-shaped cut wood having an outer peripheral surface 1a and two cut surfaces may be used.

  Furthermore, in the said embodiment, although the heat compression process is performed by the heat compression after the heat softening process of the cut wood 1 using the steaming can and the wood compression apparatus 50, it is not restricted to this. Any processing can be used as long as it can heat and compress and fix wood.

  For example, after heat-softening with steam and high frequency in a high-temperature and high-pressure vessel, compression molding may be performed to fix the compressed shape in a high-temperature and high-pressure atmosphere.

  It is also possible to perform a drying set using a lithographic press / roll press, and then perform a fixing process such as heat treatment, high-pressure steam treatment, high-frequency or microwave heat treatment, chemical treatment, resin impregnation treatment.

  Furthermore, in the said 1st Embodiment, although the cutting board material 20 which has the flat upper surface 20a is manufactured by cutting the upper surface 10a of the compressed wood 10 until the uneven | corrugated shaped part 10b is lost, the upper surface of a cutting board material is manufactured. It is not essential to cut the concavo-convex portion 10b until becomes flat.

  That is, what is necessary is just to cut the uneven | corrugated shaped part 10b of compressed wood from the outer peripheral surface 1a side so that the annual ring 11 bent in the waveform may be exposed. Even with this configuration, a beautiful grain similar to a grid pattern on the cut surface is obtained by a simple operation of cutting the uneven portion 10b remaining on the outer peripheral surface 1a (10a) of the compressed wood 10 after heat compression from the outer peripheral surface 1a side. It is possible to obtain a cutting plate material having a pattern.

  Moreover, in the said 1st Embodiment, it is set as the uneven | corrugated press surface which has an uneven | corrugated | grooved part on the flat upper surface 20a of the cutting board material 20 obtained by setting it as the structure which arrange | positioned the protrusion 40b mutually substantially parallel to the press surface 40a. A beautiful grain pattern similar to the grain pattern is revealed, but this is not a limitation. That is, it is possible to create a pattern that does not have a natural grain by adopting an uneven press surface in which the shape of the uneven portion is changed.

  In the present embodiment, [2. The bark peeling process of the outer peripheral surface 1a is performed before the [heat compression process]. [2. A peeling process may be performed after the heat compression process]. Furthermore, [2. The bark peeling process of the outer peripheral surface 1a may be performed between “2-1. Heat softening process” and “2-2. Cutting wood placement operation” in “Heat compression process”.

1 Cutting wood 1a Outer peripheral surface 1b Opposing surface (cut surface)
1c Side surface (cut surface)
11 Annual ring 11b Mountain part 12 Corrugated grain 10, 30 Compressed wood 20 Cutting plate material 20a, 30a Flat upper surface 40a Press surface (uneven press surface)
56 compression type

Claims (7)

In a method for producing compressed wood having a heat compression step for heat-compressing wood,
The wood is a cut wood having an outer peripheral surface of the raw wood of the wood and a cut surface substantially parallel to the axial direction of the raw wood,
The method for producing compressed wood, wherein the heating and compressing step is performed by applying a pressing force to the cut wood from at least the outer peripheral surface side.   The method for producing compressed wood according to claim 1, further comprising a peeling step of peeling the bark on the outer peripheral surface of the cut wood before the heat compression step. The cut surface is
The compressed wood according to claim 1 or 2, comprising a facing surface that faces the outer peripheral surface of the raw wood, and both side surfaces that are respectively located on the side of the facing surface and the outer peripheral surface. Production method. The heating and compression step is performed using a compression mold that compresses wood between two opposing press surfaces,
Of the two opposing press surfaces, the press surface facing the outer peripheral surface is an uneven press surface having an uneven portion for bending an annual ring of the cut wood in the vicinity of the outer peripheral surface into a waveform. The manufacturing method of the compressed wood of any one of Claims 1-3. In compressed wood obtained by heating and compressing wood,
The wood is a cut wood having an outer peripheral surface of the raw wood of the wood and a cut surface substantially parallel to the axial direction of the raw wood,
The compressed wood, wherein the heat compression is performed by applying a pressing force to the cut wood from at least the outer peripheral surface side.   Using the compression mold that compresses wood between the uneven press surface having an uneven portion for bending the annual ring of the cut wood near the outer peripheral surface into a waveform and the press surface facing the uneven press surface in the heat compression The compressed wood according to claim 5, wherein an uneven shape portion corresponding to the uneven press surface remains on the outer peripheral surface of the cut wood.   7. The cutting plate material according to claim 6, wherein the concavo-convex shape portion of the compressed wood is cut from the outer peripheral surface side so that the bent annual rings are exposed.

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