JP5872784B2 - WOODEN WALL MATERIAL, MANUFACTURING METHOD THEREOF, WALL STRUCTURE USING WOODEN WALL MATERIAL, AND ITS MANUFACTURING METHOD - Google Patents

Description

  The present invention relates to a wooden wall material in which a single-plate laminated board is arranged on the back surface of a wooden fiber board, and relates to a wooden wall material capable of suitably absorbing and releasing moisture.

  Conventionally, an inorganic wall material or a wood-based wall material (woody wall material) or the like has been used as a wall material having humidity control properties in order to adjust the humidity in the room (for example, see Patent Document 1). Wood-based wall materials are inferior in moisture absorption / release rate compared to inorganic wall materials.

  Therefore, in order to improve the moisture absorption / release rate of the wooden wall material, for example, a technology for forming a ditch in the direction crossing the fiber direction on the back surface of the wooden wall material or applying a humidity control agent. Proposed. For example, as a technique for forming a concave groove, a composite board in which a plywood is laminated on a wood fiber board, and a composite board in which a concave groove that does not reach the back side of the wood fiber board is formed on the back surface has been proposed. (For example, refer to Patent Document 2 or Patent Document 3). Further, a humidity control building material in which a humidity control agent is impregnated with, for example, urea has been proposed (see, for example, Patent Document 4).

JP 2010-31494 A JP 2008-25165 A JP 2007-216437 A JP 2009-209651 A

  However, as in Patent Document 2 or 3, a wooden wall material in which a single-plate laminated board such as a plywood is laminated on the back surface of a wooden fiber board has a difference in swelling between the wooden fiber board and the single-plate laminated board when moisture is absorbed and released. Or, due to the difference in shrinkage, a shearing force is generated at these interfaces, and the wooden wall material may be warped by this shearing force. In particular, as in Patent Document 4, when a humidity control agent is used, the above-described swelling difference or shrinkage difference becomes large, and such warpage becomes more prominent.

  In order to reduce this warpage, for example, it is conceivable to adjust the thicknesses of the wood fiber board and the single board laminated board so as not to be deformed with respect to the shearing force. However, in the case of a wooden wall material such as that of Patent Document 2 or 3, since the location where the rigidity of the wooden wall material is locally weak due to the formation of the concave groove, the thickness of the wooden fiberboard and the single-plate laminate is simply adjusted. It is not possible to easily reduce the warp of the wooden wall material.

  The present invention has been made in view of these points, and the object of the present invention is to absorb and release by laminating a single-plate laminate on the back surface of a wood fiber board and forming a concave groove on the back surface. An object of the present invention is to provide a wooden wall material capable of increasing the humidity and reducing the warpage due to the moisture absorption / release.

  In view of the above-mentioned problems, the inventor has made extensive studies, and as a result, during moisture absorption and release, it occurs at the interface between the wood fiber board and the difference in swelling or shrinkage between the single board laminated boards in which the single boards are laminated. We thought that it was important to reduce (disperse) the shearing force itself, rather than adjusting the thickness so that it does not deform (do not warp) against the shearing force. Therefore, as a result of repeated experiments, the inventor obtained new knowledge that the shearing force described above can be reduced by dividing the single-layer laminated plate by the groove when the groove is formed. It was.

  The present invention is based on the inventor's new knowledge described above, and the wood wall material according to the first invention is a wood fiber board, a single board laminated board joined to the back surface of the wood fiber board, In the wood wall material, a plurality of concave grooves are formed from the back surface side of the single-plate laminate to at least the back surface of the wood fiber board.

  According to the first aspect of the present invention, a plurality of concave grooves are formed on the back surface of the wooden wall material, so that moisture of the wood of the wooden wall material is absorbed and released from the groove wall surface of the single-plate laminated plate constituting the concave groove. Can be moistened. Thereby, the moisture absorption-and-release performance of a wooden wall material can be improved.

  Furthermore, the moisture absorption / release of the wood wall material increases, so that the wood fiber board and the veneer laminate swell / shrink at the time of moisture absorption / release, but at least the back side of the wood fiber board from the back side of the veneer laminate Since the plurality of concave grooves are formed until reaching the position, the single-plate laminated board at the position sandwiching the concave grooves swells and contracts independently. Thereby, the shear force produced by the difference in swelling or shrinkage between the wood fiber board and the single board laminated board can be suppressed (dispersed), and the warp of the wood wall material can be prevented.

  Here, the single plate laminate is a laminate of a plurality of single plates, and a plurality of single plates may be laminated such that the fiber directions of the plurality of single plates are all in the same direction. Single plates may be laminated so that the fiber directions of the plates alternately intersect.

  However, as a more preferable aspect, the veneer laminate is a plywood obtained by laminating the veneers in the thickness direction so that the fiber directions of a plurality of veneers intersect, and the groove is formed of the wood fiber board. It is formed along the fiber direction of a single plate including a bonding surface bonded to the back surface.

  According to this aspect, since the concave groove of the plywood is formed along the fiber direction of the single plate including the bonding surface, the swelling amount / shrinkage amount of the single plate of the bonding surface that easily contracts in the groove width direction. Can be suppressed. Thereby, the shearing force produced between the joint surface of a single board and the joint surface of a plywood can be suppressed, and the curvature of a wooden wall material can be suppressed. Furthermore, since the fiber cross section (wood end) of the single plate of the intermediate layer among the laminated single plates is exposed inside the groove, the moisture absorption and desorption of the wooden wall material can be further enhanced.

  The wood wall material according to the second invention is a wood wall material comprising at least a wood fiber board and a single board laminated board joined to the back surface of the wood fiber board, wherein the single board laminated board Is composed of a divided laminated member divided into a plurality of pieces, and the divided laminated members are joined to the back surface of the wood fiber board with a space therebetween.

  According to 2nd invention, since the said division | segmentation laminated members are joined to the back surface of a wooden fiber board at intervals, the moisture of the wood of a wooden wall material is absorbed / released from the clearance gap between division | segmentation laminated members. Can be made. Thereby, the moisture absorption-and-release performance of a wooden wall material can be improved.

  Furthermore, when the moisture absorption and release of the wooden wall material is increased, the wood fiber board and the single board laminated board swell and contract during moisture absorption and release, but the single board laminated board is divided into a plurality of divided laminated members. Therefore, the divided laminated member swells and contracts independently. Thereby, the shear force which arises by the swelling difference or shrinkage | contraction difference of the whole single board laminated board and a wood fiber board can be suppressed, and the curvature of a wood wall material can be prevented.

  Here, the single-plate laminated board and the divided laminated member obtained by dividing the single-plate laminated board are obtained by laminating a plurality of single boards in the thickness direction, and the fiber directions of the plurality of single boards are all the same direction. A plurality of single plates may be laminated so as to be, or a single plate may be laminated so that the fiber directions of the plurality of single plates intersect alternately.

  However, as a more preferable aspect, each divided laminated member is formed of a plywood obtained by laminating the single plates so that the fiber directions of a plurality of single plates intersect, and each divided laminated member is spaced from the gap. The concave grooves formed between the arranged divided laminated members are arranged along the fiber direction of a single plate including a joining surface joined to the back surface of the wood fiber board.

  According to this aspect, since the concave groove formed between the divided laminated members is formed along the fiber direction of the single plate including the bonding surface, the single plate of the bonding surface that easily contracts in the groove width direction. Can be suppressed. Thereby, the shear force generated between the joining surface of the wood fiber board and the joining surface of the plywood can be more reliably suppressed, and the warp of the wood wall material can be suppressed. Furthermore, since the fiber cross section (wood end) of the single plate of the intermediate layer among the laminated single plates is exposed inside the groove, the moisture absorption and desorption of the wooden wall material can be further enhanced.

  The present invention also provides a suitable method for producing the above-mentioned wood wall material. A method for producing a wood wall material according to the present invention is a method for producing a wood wall material comprising at least a wood fiber board and a single board laminate, and the single board laminate is joined to the back surface of the wood fiber board. And a step of cutting a plurality of grooves in the single-plate laminate until reaching at least the back of the wood fiber board from the back side of the single-plate laminate.

  According to the present invention, it is possible to easily produce a wooden wall material that suppresses the warpage caused by the shrinkage difference between the wood fiber board and the veneer laminate due to the moisture absorption / release while enhancing the moisture absorption / release. be able to. And if such a ditch | groove can be cut, the fiber direction of a single board laminated board will not be specifically limited.

  However, as a more preferable aspect, a bonding surface bonded to the back surface of the wood fiber board is used by using a plywood laminated with the single boards so that fiber directions of a plurality of single boards intersect the single board laminated board. The concave groove is cut so as to be along the fiber direction of the included veneer.

  When the inventor experimented, when the said ditch | groove was cut | disconnected so that it might cross | intersect (orthogonal) the fiber direction of the single board containing the joint surface joined to the back surface of a wood fiber board, it originates in moisture absorption / release. Deformation such as warping and undulation of the wooden wall material was likely to occur. However, by such a mode, even when a part of the joined plywood is left at the bottom of the groove when the groove is cut, the wooden wall material due to moisture absorption and desorption Deformation such as warping and undulation can be suppressed.

  And the wall structure provided with the wooden wall material which concerns on the 1st and 2nd invention, or the wooden wall material manufactured by the manufacturing method mentioned above has a space | gap between the back surface of the said wooden wall material, and a wall base material. More preferably, they are arranged so that they are formed. According to this aspect, since the space for absorbing and releasing moisture of the wooden wall material is formed between the back surface of the wooden wall material and the wall base material, the moisture absorbing and releasing property of the back surface of the wooden wall material is improved. be able to.

  According to the present invention, it is possible to increase moisture absorption and reduce warping due to moisture absorption and desorption by laminating a single plate laminate on the back surface of the wood fiber board and forming a groove on the back surface.

It is a schematic diagram of the wooden wall material of this embodiment which concerns on 1st invention, (a) is a typical perspective view which looked at the wooden wall material from the back surface side, (b) is from the longitudinal direction of (a). Viewed side view. It is a schematic diagram for demonstrating the manufacturing method of the wood wall material shown in FIG. 1, (a) is the figure which showed the process of joining a single board laminated board (plywood) to a wood fiber board, (b) is The figure which showed the process of cutting a some ditch | groove in a single board laminated board. It is the schematic diagram of the wooden wall material of this embodiment which concerns on 2nd invention, (a) is the perspective view which looked at the wooden wall material from the back surface side, (b) was seen from the longitudinal direction of (a). A side view and (c) are side views for demonstrating the manufacturing method of the wood fiber board of (a). The typical perspective view of the wall structure where the wooden wall material shown in FIG.1 and FIG.3 is arrange | positioned.

  Hereinafter, a wooden wall material and a wall structure according to this embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view of a wooden wall material according to an embodiment of the first invention, wherein (a) is a schematic perspective view of the wooden wall material viewed from the back side, and (b) is (a). It is the side view seen from the longitudinal direction Y.

  As shown in FIG. 1, a wooden wall material 1A according to the present embodiment is a building material used as a wall material, and is composed of a wood fiber board 2A and a single board laminated board 3A joined to a back surface 22A of the wood fiber board 2A. And at least.

  The wood fiber board 2A is a molded body formed into a board shape by heat-pressing wood fibers of conifers such as cedar, hinoki and pine, or wood fibers of broad-leaved trees such as lauan together with an adhesive, for example. As such a wood fiber board 2A, an insulation board, MDF, HDF, a hard board etc. can be mentioned, for example, The thickness is 2.5-30 mm.

  Thus, by making the surface 21A of the wood fiber board 2A the surface 11A of the wood wall material 1A, the smoothness of the wood wall material 1A can be maintained. Furthermore, the surface 21A of the wood fiber board 2A may be printed or painted for makeup, and a surface decorative material such as a decorative veneer, a resin decorative sheet, or a veneer may be attached.

  A single-plate laminate 3A is bonded (adhered) to the back surface 22A of the wood fiber board 2A using an aqueous adhesive such as a vinyl acetate emulsion. The single plate laminated plate 3A is a plywood in which three single plates 3a, 3b, 3c are laminated in the thickness direction of the wooden wall material 1A so that the fiber directions intersect (orthogonal). Each veneer is composed of a veneer veneer such as cedar, cypress, pine or the like, or a veneer veneer such as lauan, and the veneers are bonded to each other with an adhesive such as phenol resin. Here, the single plate laminated board 3A is arranged so that the fiber direction of the single plate 3a including the joining surface 31A joined to the back surface 22A of the wooden fiber board 2A is along the longitudinal direction X of the wooden wall material 1A. .

  In such a wood wall material 1A, a plurality of concave grooves 34A, 34A are formed from the back surface 32A side of the single plate laminate 3A to the back surface 22A of the wood fiber board 2A. In this embodiment, Each concave groove 34A reaches the back surface of the wood fiber board 2A and further reaches the surface layer 23A of the back surface 22A.

  More specifically, the plurality of concave grooves 34A are formed substantially in parallel along the longitudinal direction X of the wooden wall material 1A at a predetermined pitch in the lateral direction Y. That is, each concave groove 34A is formed along the fiber direction of the single plate 3a described above with respect to the single plate laminated plate 3A. By providing such a concave groove 34A, the end of the single plate 3b serving as an intermediate layer of the single plate laminated board 3A is exposed to the groove wall surface 35A forming each concave groove 34A.

  Here, it is preferable that the groove pitch of the concave grooves 34A, 34A,... Is 3 mm or more and 30 mm or less, and if the moisture absorption and desorption property on the back surface 12A of the wooden wall material 1A can be secured, the pitch is particularly equal. Need not be. When the groove pitch is less than 3 mm, it is difficult to provide the concave groove 34A in manufacturing. On the other hand, when the groove pitch exceeds 30 mm, the area of the groove wall surface 35A with respect to the area of the back surface 32A of the single-plate laminated board 3A decreases, so that moisture absorption / release on the back surface side of the wooden wall material 1A may be impaired. .

  The groove width of each concave groove 34A is desirably 0.5 mm to 20 mm. When the groove width is less than 0.5 mm, a space for absorbing and releasing moisture may not be sufficiently secured. On the other hand, when the groove width is 20 mm or more, not only the area of the groove wall surface 35A with respect to the area of the back surface 32A decreases, but also the mechanical strength of the wood wall material 1A may decrease.

  As described above, the depth of the concave groove 34A may be formed from the back surface 32A side of the single-plate laminated board 3A to at least the back surface 22A of the wood fiber board 2A. As long as sufficient strength can be ensured, it may reach the inside of the wood fiber board 2A. In this case, the wood wall material 1A can be easily copied to a pedestal or the like to be described later. Here, since the surface layer 23A of the wood fiber board 2A has a high fiber density and is harder than the inside, and has a high water-impermeable property, the groove is formed so as not to reach the inside where the fiber density is lower than the surface layer. It is desirable to form.

  The groove cross section of the concave groove 34A is rectangular. The reason why the cross section of the groove is rectangular is to reduce the occupation ratio of the joined portion of the wood fiber board 2A and the single board laminated board 3A and to reduce the warp of the wood wall material 1A described later. Therefore, when forming such a groove 34A, if a part of the wood of the single plate 3a does not remain at the bottom of the groove 34A during processing, the wooden wall material 1A has a higher strength. If desired, the bottom surface of the recessed groove 34A preferably coincides with the back surface 22A of the wood fiber board 2A.

  However, if such warpage can be reduced, the shape of the groove cross section of the concave groove 34A may be V-shaped or U-shaped. In this case, as in this embodiment, The recessed groove 34A is preferably formed from the back surface 22A of the wood fiber board 2A to the surface layer 23A.

  Further, a humidity conditioner may be added to the groove wall surface 35A. Thereby, the moisture absorption / release property on the back surface 12A side of the wooden wall material 1A can be further enhanced. Such a humectant is hygroscopic and is impregnated in the back surface 32A and the groove wall surface 35A of the single plate laminate 3A by applying it as it is or water-soluble and applying it from the back surface of the wood wall material 1A. Those that can be used are preferred.

  Examples of such humidity conditioners include alkali metal hydroxides (sodium hydroxide, potassium hydroxide, etc.), water-soluble polymers (polyethylene glycol), glycols (glycerin, ethylene glycol, etc.), urea derivatives, Water absorption and hygroscopicity such as inorganic salts (sodium chloride, etc.), water-soluble amines (eg, ethanolamine), acrylates (sodium acrylate, sodium polyacrylate, etc.), polyvinyl alcohols, acid hydrazides, or sugars Can be mentioned.

  According to the wood wall material 1A according to the above-described embodiment, the plurality of grooves 34A, 34A, ... are formed on the back surface 12A of the wood wall material 1A, so that the single-plate laminate 3A constituting the groove 34A is formed. The moisture of the wood of the wooden wall material 1A can be absorbed and released from the groove wall surface 35A. Thereby, the moisture absorption / release performance of 1 A of wooden wall materials can be improved. Here, the fiber cross section (wood lip) of the single plate 3b which is the intermediate layer constitutes a part of the groove wall surface 35A and is exposed inside the groove, so that the moisture absorption / release property of the wooden wall material 1A can be enhanced. In particular, from the experience of the inventor, it is more difficult to expose the end of the single plate 3b, which is the intermediate layer, than the case where the end of the single plate 3a joined to the wood fiber board 2A is exposed. Since moisture easily diffuses from the mouth to the opening, it is possible to further improve the moisture absorption / release property of the wooden wall material 1A.

  By providing the plurality of concave grooves 34A in this manner, the moisture absorption / release of the wood wall material 1A is increased, and when a humidity control agent is further applied, the moisture absorption / release of the wood wall material 1A is further increased. At the time of moisture absorption / release, the wood fiber board 2A and the single board laminated board 3A swell / shrink, but a plurality of grooves are formed from the back face 32A side of the single board laminated board 3A until reaching at least the back face 22A of the wooden fiber board 2A. 34A, 34A,... Are formed, the single plate laminate 3A at the positions sandwiching the concave grooves 34A, 34A swells and contracts independently. Thereby, the shear force which arises by the swelling difference or shrinkage | contraction difference of the wood fiber board 2A and the single board laminated board 3A can be suppressed, and the curvature of the wood wall material 1A can be prevented.

  In particular, in the present embodiment, the groove 34A formed in the single plate laminated plate 3A that is a plywood is formed so as to be along the fiber direction of the single plate 3a including the joining surface 31A. The amount of swelling / shrinkage of the single plate 3a of the joint surface 31A that easily contracts in the hand direction Y) can be suppressed, and the warp of the wood wall material 1A can be further prevented.

  A method for manufacturing the above-described wooden wall material 1A will be described below with reference to FIG. FIG. 2 is a view for explaining a method of manufacturing the wooden wall material 1A shown in FIG. 1, and (a) shows a step of joining a single-plate laminated board (plywood) 3A to the wooden fiber board 2A. FIG. 4B is a diagram showing a process of cutting a plurality of concave grooves 34A into the single-plate laminate 3A.

  First, as shown in FIG. 2 (a), a wood fiber board 2A and a single board laminated board 3A are prepared, and an aqueous adhesive such as a vinyl acetate emulsion is attached to at least one of these surfaces (bonding surface). The wood fiber board 2A and the single board laminated board 3A are joined. At this time, the wood fiber board 2A and the single board laminated board 3A laminated with an adhesive may be formed by hot pressing.

  Here, although vinyl acetate emulsion was used in the embodiment, for example, thermoplastic resins such as ethylene vinyl acetate resin, synthetic rubber, and glue, and resins modified so as to be crosslinkable, urethane resins, epoxy resins, There are thermosetting resins such as urea / melamine co-condensation resins and phenol resins. A water-based resin that is usually easy to handle is used, but an oil-based resin may be used if there is no problem.

  Next, as shown in FIG. 2B, from the back surface 32A side of the single-plate laminate 3A until reaching at least the back surface 22A of the wood fiber board 2A (in this embodiment, the surface layer of the back surface 22A of the wood fiber board 2A) 23A), a plurality of grooves 34A, 34A,... Are cut into the single-plate laminated board 3A using a saw (round saw) 9 and groove processing is performed. More specifically, a plurality of concave grooves 34A, 34A,... Are cut along the fiber direction of the single plate 3a including the joining surface 31A joined to the back surface 22A of the wood fiber board 2A.

  Here, in this embodiment, the groove 9 is cut to the surface layer 23A of the back surface 22A of the wood fiber board 2A with the saw 9, but this is attached (bonded) to a part of the bottom surface of the groove 34A. This is because the remaining material of the single plate 3a is completely removed.

  Further, such groove processing can be performed by a conventionally known processing means such as laser processing, water jet processing, ultrasonic cutter, end mill (router), knife blade, Thomson blade and the like.

  Thus, since the groove 34A is cut from the back surface 32A side of the single plate laminate 3A to the surface layer 23A of the back surface 22A of the wood fiber plate 2A, a part of the wood of the bonded single plate 3a does not remain, As a result, the warp and wave of the wooden wall material 1A can be reduced.

  Further, when the groove 34A is processed from the back surface 32A side of the single-plate laminated board 3A to the back surface 22A of the wood fiber board 2A, when the saw is used, the groove 34A is formed from the shape of the blade edge of the blade. Part of the wood of the bonded veneer 3a is likely to remain in the bonded state at the bottom of the wood, and there is a concern that the wooden wall material may be warped or deformed during moisture absorption and release. However, even in such a case, the groove 34A is cut along the fiber direction of the veneer 3a including the joining surface 31A joined to the back surface 22A of the wood fiber board 2A. Deformation such as warping and waving of the wooden wall material can be suppressed.

  FIG. 3 is a schematic view of the wood wall material of the present embodiment according to the second invention, wherein (a) is a perspective view of the wood wall material viewed from the back side, and (b) is a longitudinal view of (a). The side view seen from the direction, (c) is a side view for explaining the manufacturing method of the wood fiber board (a). In addition, about the member which has the same function as embodiment shown in FIG. 1, the code | symbol A of the end is changed into B, The detailed description is partially abbreviate | omitted.

  As shown in FIGS. 3 (a) and 3 (b), the wood wall material 1B according to the second invention includes a wood fiber board 2B and a single board laminated board 3B joined to the back surface 22B of the wood fiber board 2B. At least. The material and dimensions of the wood fiber board 2B are the same as those described above. The difference from the wood fiber board 2A in the form shown in FIG. 1 is that the surface layer 23B of the wood fiber board 2B has a groove 34B. It is a point that a part is not formed.

  That is, in this embodiment, the single-plate laminated board 3B includes divided laminated members 30B, 30B,... Divided into a plurality, and the divided laminated members 30B, 30B are spaced apart from each other on the back surface 22B of the wood fiber board 2B. Are joined via the adhesive described above.

  The divided laminated member 30B is formed from a plywood obtained by laminating three single plates 3a, 3b, 3c in the thickness direction, and the fiber directions of the three single plates 3a, 3b, 3c alternately intersect. Thus, it is a member formed by a plywood laminated with a single plate. Each of the divided laminated members 30B, 30B,... Has a bonding surface 31B in which a concave groove 34B formed between the divided laminated members 30B, 30B arranged at intervals is bonded to the back surface 22A of the wood fiber board 2B. It arrange | positions so that the fiber direction of the single plate 3a containing may be followed.

  Such a concave groove 34B is determined by the shape of the divided laminated member 30B and the interval between them, the groove pitch and the groove width are in the above-described ranges, and the groove depth is the divided laminated member. It is the thickness of itself. FIG. 3 shows the groove as in the embodiment shown in FIG. 1, but is not limited to this shape. For example, a groove along the short direction Y in FIG. 3 is further formed. May be.

  According to the present embodiment, since the divided laminated members 30B and 30B are joined to the back surface 22B of the wooden fiber board 2B with a space therebetween, from the gap between the divided laminated members 30B and 30B, The moisture of wood can be absorbed and released. Thereby, the moisture absorption / release performance of the wooden wall material 1B can be enhanced. Among the laminated single plates, the fiber cross section (wood end) of the single plate 3b of the intermediate layer is exposed inside the groove, so that the moisture absorption and desorption of the wooden wall material 1B can be further improved.

  Furthermore, when the moisture absorption / release of the wood wall material 1B is increased, the wood fiber board 2B and the single board laminated board 3B swell / shrink at the time of moisture absorption / release, but the single board laminated board 3B is divided into a plurality of pieces. Therefore, the divided laminated member 30B swells and contracts independently. Thereby, the shear force which arises by the swelling difference or shrinkage | contraction difference of the whole single board laminated board and a wood fiber board can be suppressed, and the curvature of the wood wall material 1B can be prevented. In particular, since the concave groove 34B formed between the divided laminated members 30B and 30B is formed along the fiber direction of the single plate 3a including the joining surface 31B, in the groove width direction (short direction Y). The amount of swelling / shrinkage of the single plate 3a having a joint surface that tends to shrink can be suppressed. Thereby, the shear force generated between the veneer 3a and the wood fiber board 2B can be more reliably suppressed, and the warp of the wood wall material 1B can be suppressed. Moreover, in this embodiment, since the ditch | groove 34B has not reached the surface layer 23B of the back surface 22B of the wood fiber board 2B, the strength of the wood wall material 1B can be ensured.

  As shown in FIG. 3 (c), the above-mentioned wood wall material 1B is prepared with a wood fiber board 2B and a plurality of divided laminated members 30B, and an aqueous adhesive such as the above-mentioned vinyl acetate emulsion is added to at least these. It is applied to one surface (joint surface), and the wood fiber board 2B and the divided laminated member 30B are joined so that the above-described concave groove 34B is formed between the divided laminated members 30B and 30B. At this time, the wood fiber board 2B and the laminated laminated member 30B laminated with an adhesive may be formed by hot pressure treatment. Moreover, you may arrange | position the reinforcement plate for reinforcing the wooden wall material 1B further adjacent to the wooden wall material 1B.

  The wall structure 10A or 10B provided with the above-described wood wall material 1A or 1B will be described below. FIG. 4 is a schematic perspective view of a wall structure in which the wooden wall materials shown in FIGS. 1 and 3 are arranged. As shown in FIG. 4, the wall structure 10A (10B) is a wall structure 10A (10B) including a plurality of wooden wall materials 1A (1B), and the back surface 12A (12B) of the wooden wall material 1A (1B). Are opposed to each other through the piers 8 and 8, and the wooden wall material is formed such that a gap (space) S is formed between the back surface 12A (12B) of the wooden wall material 1A (1B) and the wall base material W. 1A (1B) is arranged.

  Thus, since the gap S for absorbing and releasing moisture of the wooden wall material 1A (1B) is formed between the back surface of the wooden wall material 1A (1B) and the wall base material W, the wooden wall material 1A ( The moisture absorption / release property of the back surface 12A (12A) of 1B) can be enhanced. In addition, the strength of the wood wall material 1A (1B) in the short direction substantially depends on the wood fiber board 2A (2B), so the wood wall material 1A (1B) slightly warps in the short direction. Even so, the warp can be easily corrected to follow the pier. Moreover, it can be fixed not only with a pier but also with a metal fitting.

Hereinafter, the present invention will be described by way of examples.
[Example 1]
A wooden wall was produced as shown below. 1820 x 910 mm x 5.5 mm thick MDF (wood fiber board) and 1820 x 910 mm x 9 mm thick (single board 2.5 mm + 4 mm + 2.5 mm) 3 ply cedar plywood (single board laminate) These were joined (adhered) via a vinyl acetate emulsion adhesive. In addition, the plywood is joined to the MDF so that the single plate (2.5 mm thick single plate) having a joint surface to be joined to the MDF has the fiber direction along the longitudinal direction.

  Next, using a circular saw, from the back of the plywood to the surface layer of the wood fiber board, a groove depth of 9.5 mm (see Table 1 below), a groove pitch of 10 mm in the short direction, and a groove width of 3 mm Was formed along the longitudinal direction. That is, this groove is a concave groove that reaches a part of the surface layer of the MDF, and is a rectangular concave groove along a single plate (single plate having a thickness of 2.5 mm) having a bonding surface bonded to the MDF. .

[Comparative Example 1]
In the same manner as in Example 1, a wooden wall material was produced. As shown in Table 1 below, the difference from Example 1 is that the groove depth is 5 mm, 6.5 mm, 7.5 mm so as not to reach at least the back surface of the wood fiber board from the back surface side of the MDF. Is formed for each wooden wall material.

[Measurement of warpage]
After the wood wall material of Example 1 and Comparative Example 1 was dried at 60 ° C. for 24 hours, it was left to stand in an environment of 40 ° C. and RH 90% for 6 days, and the arrow height in the short direction of the flatly placed state was measured. . The results are shown in Table 1. When the wooden wall material is warped so that the central part of the wooden wall material swells on the back side, the height of the central part with respect to both edges is the arrow height (+), and the central part of the wooden wall material is on the front side When the wooden wall material warps so as to swell, the height of the central portion with respect to both edge portions was measured as an arrow height (-).

[Result 1 and Discussion 1]
(1) The arrow height of the wooden wall material of Example 1 was smaller than that of Comparative Example 1, and the warp of the wooden wall material was small. (2) In Comparative Example 1, the arrow height of the wood wall material with a groove depth of 5 mm was smaller than that of the other Comparative Example 1.

  The result shown in (1) is that in the case of the wood wall material of Example 1, the shear stress generated in the plywood and the MDF can be dispersed by forming the concave groove so as to completely cut the plywood layer. This is probably because it was made.

  The result shown in (2) was that the wood fiber board and the plywood had rigidity so as not to be deformed by the shear stress generated between them (the rigidity of the wood fiber board and the plywood was balanced). ). However, in the case of a wood wall material with a groove depth of 5 mm, the rate at which the second end of the plywood (the single plate of the intermediate layer) is exposed is small, so that moisture absorption and desorption is less than that of other wood wall materials. The performance is considered low.

  Thus, as in Example 1, it is sufficient to form a groove having a depth of the groove so as to reach at least the back surface of the wood fiber board from the back surface of the plywood. It is not necessary to determine the optimum groove depth (for example, the groove depth of 5 mm in the case described above) in consideration of the balance between the rigidity of the fiberboard and the plywood.

[Example 2]
In the same manner as in Example 1, a wooden wall material was produced. The difference from Example 1 is that MDF (wood fiberboard) having a size of 1820 mm × 910 mm × thickness 2.7 mm was used.

[Comparative Example 2]
In the same manner as in Example 2, a wooden wall material was produced. The difference from Example 2 is that, as shown in Table 2 below, the groove depth, 6.5 mm, 7.5 mm, and 8.5 mm so as not to reach at least the back surface of the wood fiber board from the back surface side of the MDF. This is the point that each groove was formed on each wooden wall material.

[Measurement of warpage]
In the same manner as in Example 1, the wooden wall materials of Example 2 and Comparative Example 2 were dried at 60 ° C. for 24 hours (1 day), and then flattened in the short direction and 40 ° C. The arrow height in the short direction was measured after standing for 6 days in an environment of 90% RH. The results are shown in Table 2.

[Result 2 and discussion 2]
The arrow height of the wooden wall material of Example 2 was smaller than that of Comparative Example 2, and the warp of the wooden wall material was small. From the results of Table 1 and Table 2, regardless of the thickness of the MDF, by forming the concave groove so as to completely cut the plywood layer, the shear stress generated in the plywood and the MDF can be dispersed. It is considered that the warp of the wooden wall material can be reduced.

Example 3
In the same manner as in Example 1, a wooden wall material was produced. The difference from Example 1 is that a 5-ply cedar plywood (single plate laminate) of 1820 mm × 910 mm × thickness 12 mm (single plate 2 mm + 3 mm + 2 mm + 3 mm + 3 mm) was used and the groove depth was 12.1 mm.

[Comparative Example 3]
In the same manner as in Example 2, a wooden wall material was produced. The difference from Example 2 is that, as shown in Table 3 below, grooves having a groove depth of 5 mm, 10 mm, and 11.9 mm are provided so as not to reach at least the back surface of the wood fiber board from the back surface side of the MDF. It is a point formed on the wooden wall material.

[Measurement of warpage]
In the same manner as in Example 1, the wooden wall materials of Example 3 and Comparative Example 3 were dried at 60 ° C. for 24 hours (1 day), and then flattened in the short direction and 40 ° C. The arrow height in the short direction was measured after standing for 6 days in an environment of 90% RH. The results are shown in Table 3.

[Result 3 and Discussion 3]
(3) The arrow height of the wooden wall material of Example 3 was smaller than that of Comparative Example 3, and the warp of the wooden wall material was small. (4) Of Comparative Example 3, the arrow height of the wood wall material having a groove depth of 5 mm after the test at 40 ° C. and RH 90% was smaller than that of the other Comparative Example 3.

  From the results shown in Table 1 and (3), it was possible to disperse the shear stress generated in the plywood and the MDF by forming the groove so as to completely cut the plywood layer regardless of the thickness of the plywood. Thus, it is considered that the warp of the wooden wall material can be reduced. Note that the result shown in (4) is that the wood fiberboard and the plywood are rigid so as not to be deformed by the shear stress generated between them, as in (2) (see Comparative Example 1). This is thought to be because there was.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed.

  For example, in the present embodiment, the single plate laminated plate is a laminate of three single plates, but the number of single plates is not particularly limited as long as it is a plurality.

  1A, 1B: Wood wall material, 2A, 2B: Wood fiber board, 3A, 3B: Single board laminated board, 3a, 3b, 3c: Single board, 8: Crosspiece, 9: Saw, 10A, 10B: Wall structure, 11A, 11B: surface of wood wall material, 12A, 12B: back surface of wood wall material, 21A, 21B: surface of wood fiber board, 22A, 22B: back surface of wood fiber board, 23A, 23B: surface layer of wood fiber board, 30B: Split laminated member, 31A, 31B: Joint surface of single plate laminated plate, 32A, 32B: Back surface of single plate laminated plate, 34A, 34B: Concave groove, 35A, 35B: Groove wall surface, W: Wall base material, X : Longitudinal direction, Y: Short direction

Claims (5)

A wood wall material comprising at least a wood fiber board and a single board laminated board joined to the back surface of the wood fiber board,
The wood wall material is formed with a plurality of concave grooves from the back side of the veneer laminate until reaching at least the back side of the wood fiber board,
The veneer laminate is a plywood obtained by laminating the veneers so that the fiber directions of a plurality of veneers intersect, and the concave groove includes a bonding surface bonded to the back surface of the wood fiber board. A wooden wall material characterized by being formed along the fiber direction. A wood wall material comprising at least a wood fiber board and a single board laminated board joined to the back surface of the wood fiber board,
The single-plate laminated plate is composed of divided laminated members divided into a plurality of pieces, and the divided laminated members are joined to the back surface of the wood fiber board with a gap therebetween,
Each divided laminated member is formed of a plywood obtained by laminating the single plates so that the fiber directions of a plurality of single plates intersect, and each divided laminated member is between the divided laminated members arranged with the space therebetween. The wood wall material characterized by being arranged so that the ditch | groove formed in 1 may be followed along the fiber direction of the single board containing the joining surface joined to the back surface of the said wood fiber board. A method for producing a wood wall material comprising at least a wood fiber board and a veneer laminate,
Bonding a single-plate laminate to the back of the wood fiber board;
Cutting at least a plurality of concave grooves in the single plate laminate until reaching at least the back of the wood fiber plate from the back side of the single plate laminate,
Using the plywood laminated the single plate so that the fiber direction of a plurality of single plates intersects the single plate laminated plate,
The method for producing a wooden wall material, wherein the groove is cut along a fiber direction of a single plate including a bonding surface bonded to the back surface of the wooden fiber board. It is a wall structure provided with the wooden wall material of Claim 1 or 2, Comprising: The said wooden wall material is arrange | positioned so that a clearance gap may be formed between the back surface of the said wooden wall material, and a wall base material. A wall structure characterized by Wooden wall material according to claim 1 or 2, or a method for producing a wall structure with wooden wall material produced by the method of claim 3, the back surface of the wooden wall material, wall base as the gap is formed between the wood, the production method of the wall structure, characterized in placing the wooden wall material.

Images