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

WOODEN WALL MATERIAL, MANUFACTURING METHOD THEREOF, WALL STRUCTURE USING WOODEN WALL MATERIAL, AND ITS MANUFACTURING METHOD Download PDF

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JP5872784B2
JP5872784B2 JP2011079676A JP2011079676A JP5872784B2 JP 5872784 B2 JP5872784 B2 JP 5872784B2 JP 2011079676 A JP2011079676 A JP 2011079676A JP 2011079676 A JP2011079676 A JP 2011079676A JP 5872784 B2 JP5872784 B2 JP 5872784B2
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文治 川端
文治 川端
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Eidai Co Ltd
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Description

本発明は、木質繊維板の裏面に、単板積層板を配置した木質壁材に係り、吸放湿を好適に行うことができる木質壁材に関する。   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.

従来から、室内の湿度調整をすべく、調湿性を有した壁材として、無機系壁材または木質系壁材（木質壁材）等が用いられている（たとえば、特許文献１参照）。木質系壁材は、無機系の壁材に比べて、吸放湿速度が劣る。   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.

そこで、木質壁材の吸放湿速度を改善するために、例えば、木質系壁材の裏面に、繊維方向と交差する方向に凹溝を形成したり、調湿剤を塗布したりする技術が提案されている。たとえば、凹溝を形成する技術として、木質繊維板に、合板を積層した複合板であって、その裏面に、木質繊維板の裏面に達しない凹溝が形成された複合板が提案されている（例えば、特許文献２または特許文献３参照）。また、調湿剤に、例えば尿素を含浸させた調湿建材が提案されている（たとえば、特許文献４参照）。   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).

特開２０１０−３１４９４号公報JP 2010-31494 A 特開２００８−２５１６５号公報JP 2008-25165 A 特開２００７−２１６４３７号公報JP 2007-216437 A 特開２００９−２０９６５１号公報JP 2009-209651 A

しかしながら、特許文献２または３の如く、木質繊維板の裏面に、合板のような単板積層板を積層した木質壁材は、吸放湿時に、木質繊維板と単板積層板との膨潤差または収縮差によって、これらの界面にせん断力が生じ、このせん断力によって、木質壁材に反りが生じることがある。特に、特許文献４の如く、調湿剤を用いた場合には、上述した膨潤差または収縮差が大きくなり、このような反りはより顕著なものとなる。   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.

そして、この反りを低減するには、例えば、せん断力に対して、変形しないように木質繊維板と単板積層板との厚さを調整することも考えられる。しかし、特許文献２または３の如き木質壁材の場合、凹溝の形成により木質壁材の剛性が局所的に弱いところが発生するので、木質繊維板と単板積層板との厚さを単に調整するだけでは、木質壁材の反りを容易に低減することができない。   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.

本発明は、このような点を鑑みてなされたものであり、その目的とするところは、木質繊維板の裏面に単板積層板を積層し、この裏面に凹溝を形成することにより吸放湿を高め、該吸放湿による反りを低減することができる木質壁材を提供することにある。   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.

前記課題を鑑みて、発明者は、鋭意検討を重ねた結果、吸放湿時に、木質繊維板と、単板を積層した単板積層板との膨潤差または収縮差によって、これらの界面に生じるせん断力に対して、変形しない（反らない）ように厚さを調整するのでなく、せん断力そのものを低減する（分散する）ことが重要であると考えた。そこで、発明者は、繰り返し実験を行った結果、凹溝を形成する際に、その凹溝により、単層積層板を分断することにより、上述したせん断力を低減できるとの新たな知見を得た。   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.

本発明は、上述した発明者の新たな知見に基づくものであり、第１の発明に係る木質壁材は、木質繊維板と、該木質繊維板の裏面に接合された単板積層板と、を少なくとも備えた木質壁材であって、前記木質壁材は、前記単板積層板の裏面側から前記木質繊維板の少なくとも裏面に達するまで複数の凹溝が形成されている。   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.

第１の発明によれば、木質壁材の裏面に、複数の凹溝が形成されることにより、凹溝を構成する単板積層板の溝壁面から、木質壁材の木材の水分を吸放湿させることができる。これにより、木質壁材の吸放湿性能を高めることができる。   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.

さらに、木質壁材の吸放湿が高まることにより、吸放湿時に、木質繊維板と単板積層板とが、膨潤・収縮するが、単板積層板の裏面側から木質繊維板の少なくとも裏面に達するまで複数の凹溝が形成されているので、凹溝を挟んだ位置の単板積層板は、それぞれ独立して膨潤・収縮することになる。これにより、木質繊維板と単板積層板の膨潤差または収縮差により生じるせん断力を抑え（分散させ）、木質壁材の反りを防止することができる。   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.

ここで、単板積層板は、複数の単板を積層したものであり、複数の単板の繊維方向が、すべて同じ方向となるように複数の単板を積層してもよく、複数の単板の繊維方向が交互に交差するように、単板を積層したものであってもよい。   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.

しかしながら、より好ましい態様としては、単板積層板は、複数の単板の繊維方向が交差するように前記単板を厚さ方向に積層した合板であり、前記凹溝は、前記木質繊維板の裏面に接合される接合面を含む単板の繊維方向に沿うように形成されている。   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.

この態様によれば、前記合板の凹溝が、接合面を含む単板の繊維方向に沿うように形成されているので、溝幅方向に収縮しやすい接合面の単板の膨潤量・収縮量を抑えることができる。これにより、単板の接合面と、合板の接合面との間に生じるせん断力を抑え、木質壁材の反りを抑えることができる。さらに、積層された単板のうち、中間層の単板の繊維断面（木口）が溝内部において露呈するので、木質壁材の吸放湿性をさらに高めることができる。   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.

また、第２の発明に係る木質壁材は、木質繊維板と、該木質繊維板の裏面に接合された単板積層板と、を少なくとも備えた木質壁材であって、前記単板積層板は、複数に分割された分割積層部材からなり、前記分割積層部材同士は、間隔をあけて前記木質繊維板の裏面に接合されていることを特徴とする。   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.

第２の発明によれば、前記分割積層部材同士が、間隔をあけて木質繊維板の裏面に接合されているので、分割積層部材同士の隙間から、木質壁材の木材の水分を吸放湿させることができる。これにより、木質壁材の吸放湿性能を高めることができる。   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.

さらに、木質壁材の吸放湿が高まることにより、吸放湿時に、木質繊維板と単板積層板とが、膨潤・収縮するが、単板積層板は、複数に分割された分割積層部材からなるので、分割積層部材は、独立して膨潤・収縮することになる。これにより、単板積層板全体と木質繊維板との膨潤差または収縮差により生じるせん断力を抑え、木質壁材の反りを防止することができる。   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.

ここで、単板積層板およびこれを分割した分割積層部材は、複数の単板をこれらの厚さ方向に積層したものであり、これらは、複数の単板の繊維方向が、すべて同じ方向となるように複数の単板を積層してもよく、複数の単板の繊維方向が交互に交差するように、単板を積層したものであってもよい。   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.

しかしながら、より好ましい態様としては、各分割積層部材は、複数の単板の繊維方向が交差するように前記単板を積層した合板から形成されており、各分割積層部材は、前記間隔をあけて配置した分割積層部材同士の間に形成された凹溝が、前記木質繊維板の裏面に接合される接合面を含む単板の繊維方向に沿うように配置されている。   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.

この態様によれば、分割積層部材同士の間に形成された凹溝が、接合面を含む単板の繊維方向に沿って形成されているので、溝幅方向に収縮しやすい接合面の単板の膨潤量・収縮量を抑えることができる。これにより木質繊維板の接合面と合板の接合面との間に生じるせん断力をより確実に抑え、木質壁材の反りを抑えることができる。さらに、積層された単板のうち、中間層の単板の繊維断面（木口）が溝内部において露呈するので、木質壁材の吸放湿性をさらに高めることができる。   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.

本発明として、上述した木質壁材の好適な製造方法も提供する。本発明に係る木質壁材の製造方法は、木質繊維板と単板積層板とを少なくとも備えた木質壁材を製造する方法であって、前記木質繊維板の裏面に単板積層板を接合する工程と、前記単板積層板の裏面側から前記木質繊維板の少なくとも裏面に達するまで、前記単板積層板に複数の凹溝を切り込む工程と、を少なくとも含むことを特徴とする。   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.

本発明によれば、吸放湿を高めつつ、この吸放湿が起因となった木質繊維板と単板積層板との収縮差が起因となる反りを抑制した木質壁材を容易に製造することができる。そして、このような凹溝を切り込むことができるのであれば、単板積層板の繊維方向は特に限定されるものではない。   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.

しかしながら、より好ましい態様としては、前記単板積層板に、複数の単板の繊維方向が交差するように前記単板を積層した合板を用い、前記木質繊維板の裏面に接合される接合面を含む単板の繊維方向に沿うように、前記凹溝を切り込む。   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.

発明者が実験したところ、木質繊維板の裏面に接合される接合面を含む単板の繊維方向に交差（直交）するように、前記凹溝を切り込んだ場合には、吸放湿を起因とした木質壁材の反り、波打ちなどの変形が生じやすかった。しかし、このような態様することにより、凹溝の切り込みの際に、溝の底部に、接合した合板の一部の木材が残った場合であっても、吸放湿を起因とした木質壁材の反り、波打ちなどの変形を抑えることができる。   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.

そして第１および第２の発明に係る木質壁材、または上述した製造方法により製造された木質壁材を備えた壁構造は、前記木質壁材の裏面と、壁下地剤との間に間隙が形成されるように、配置されていることがより好ましい。この態様によれば、前記木質壁材の裏面と壁下地材との間に、木質壁材の吸放湿するための空間が形成されるので、前記木質壁材の裏面の吸放湿性を高めることができる。   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.

本発明によれば、木質繊維板の裏面に単板積層板を積層し、この裏面に凹溝を形成することにより吸放湿を高め、該吸放湿による反りを低減することができる。   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.

第１の発明に係る本実施形態の木質壁材の模式図であり、（ａ）は、木質壁材を裏面側から見た模式的斜視図、（ｂ）は、（ａ）の長手方向から見た側面図。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. 図１に示す木質壁材の製造方法を説明するための模式図であり、（ａ）は、木質繊維板に、単板積層板（合板）を接合する工程を示した図、（ｂ）は、単板積層板に複数の凹溝を切り込む工程を示した図。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. 第２の発明に係る本実施形態の木質壁材の模式図であり、（ａ）は、木質壁材を裏面側から見た斜視図、（ｂ）は、（ａ）の長手方向から見た側面図、（ｃ）は、（ａ）の木質繊維板の製造方法を説明するための側面図。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). 図１及び図３に示す木質壁材が配置された壁構造の模式的斜視図。The typical perspective view of the wall structure where the wooden wall material shown in FIG.1 and FIG.3 is arrange | positioned.

以下に図面を参照して、本発明の本実施形態に係る木質壁材および壁構造について説明する。   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.

図１は、第１の発明にかかる実施形態に係る木質壁材の模式図であり、（ａ）は、木質壁材を裏面側から見た模式的斜視図、（ｂ）は、（ａ）の長手方向Ｙから見た側面図である。   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.

図１に示すように、本実施形態に係る木質壁材１Ａは、壁材として使用される建材であり、木質繊維板２Ａと、木質繊維板２Ａの裏面２２Ａに接合された単板積層板３Ａと、を少なくとも備えている。   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.

木質繊維板２Ａは、スギ、ヒノキ、マツなどの針葉樹の木質繊維、またはラワンなどの広葉樹の木質繊維を例えば接着剤と共に熱圧することによりボード状に成形した成形体である。このような木質繊維板２Ａとして、例えばインシュレーションボード、ＭＤＦ，ＨＤＦ、ハードボードなどを挙げることができ、その厚さは２．５〜３０ｍｍである。   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.

このように木質繊維板２Ａの表面２１Ａを、木質壁材１Ａの表面１１Ａとすることにより、木質壁材１Ａの平滑性を保つことができる。さらに、この木質繊維板２Ａの表面２１Ａは、化粧用に印刷または塗装されていてもよく、化粧単板、樹脂製の化粧シート、突板のような表面化粧材が貼着されていても良い。   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.

木質繊維板２Ａの裏面２２Ａには、単板積層板３Ａが、例えば酢酸ビニルエマルジョンのような水性の接着剤を用いて接合（接着）されている。単板積層板３Ａは、３つの単板３ａ，３ｂ，３ｃを、繊維方向が交差（直交）するように木質壁材１Ａの厚さ方向に積層した合板である。各単板は、スギ、ヒノキ、マツなどの針葉樹の単板、またはラワンなどの広葉樹の単板などからなり、各単板同士は、フェノール樹脂等の接着剤により接着されている。ここで、木質繊維板２Ａの裏面２２Ａに接合される接合面３１Ａを含む単板３ａの繊維方向が、木質壁材１Ａの長手方向Ｘに沿うように、単板積層板３Ａは配置されている。   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. .

このような木質壁材１Ａは、単板積層板３Ａの裏面３２Ａの側から、木質繊維板２Ａの裏面２２Ａに達するまで、複数の凹溝３４Ａ，３４Ａが形成されており、本実施形態では、各凹溝３４Ａは、木質繊維板２Ａの裏面に到達し、さらに裏面２２Ａの表層２３Ａまで達している。   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.

より具体的には、複数の凹溝３４Ａは、短手方向Ｙに所定のピッチで、木質壁材１Ａの長手方向Ｘに沿って略平行に形成されている。すなわち、各凹溝３４Ａは、単板積層板３Ａに対して上述した単板３ａの繊維方向に沿うように形成されていることになる。このような凹溝３４Ａを設けることにより、各凹溝３４Ａを形成する溝壁面３５Ａに、単板積層板３Ａの中間層となる単板３ｂの木口が露出することになる。   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.

ここで、凹溝３４Ａ，３４Ａ，…の溝ピッチは、３ｍｍ以上、３０ｍｍ以下であることが好ましく、木質壁材１Ａの裏面１２Ａにおける吸放湿性を確保することができるのであれば、特に等ピッチである必要はない。溝ピッチが３ｍｍ未満の場合には、製造上、凹溝３４Ａを設けることが難しくなる。一方、溝ピッチが３０ｍｍを超えた場合には、単板積層板３Ａの裏面３２Ａの面積に対する溝壁面３５Ａの面積が減少するため、木質壁材１Ａの裏面側の吸放湿を損なうおそれがある。   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. .

各凹溝３４Ａの溝幅は、０．５ｍｍ〜２０ｍｍであることが望ましい。溝幅が、０．５ｍｍ未満の場合には、水分を吸放湿する空間が充分に確保できないことがある。一方、溝幅が、２０ｍｍ以上の場合には、裏面３２Ａの面積に対する溝壁面３５Ａの面積が減少するばかりでなく、木質壁材１Ａの機械的強度が低下するおそれがある。   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.

凹溝３４Ａの深さは、上述したように、単板積層板３Ａの裏面３２Ａの側から、少なくとも木質繊維板２Ａの裏面２２Ａに達するまで、形成されていればよく、木質壁材１Ａの機械的強度を確保することができるのであれば、木質繊維板２Ａの内部にまで達していても良く、この場合には、後述する桟木などに木質壁材１Ａを容易に倣わすことができる。ここで、木質繊維板２Ａの表層２３Ａは、繊維密度が高く内部に比べて硬質であるため、非透水性が高いので、この表面層よりもさらに繊維密度の低い内部に達しないように凹溝を形成することが望ましい。   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.

また、凹溝３４Ａの溝断面は、矩形状である。溝断面を矩形状にしたのは、木質繊維板２Ａと単板積層板３Ａの接合部分の占有率をより少なくし、後述する木質壁材１Ａの反りを低減さえるためである。したがって、このような凹溝３４Ａを形成する場合には、加工時において、単板３ａの一部の木材が、凹溝３４Ａの底部に残らないのであれば、木質壁材１Ａのより高い強度を望む場合には、凹溝３４Ａの底面は、木質繊維板２Ａの裏面２２Ａに一致することが好ましい。   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.

しかしながら、このような反りを低減することができるであれば、凹溝３４Ａの溝断面の形状は、Ｖ字状、Ｕ字上であってもよく、この場合には、本実施形態の如く、凹溝３４Ａは、木質繊維板２Ａの裏面２２Ａからさらにその表層２３Ａまで形成されていることが好ましい。   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.

また、溝壁面３５Ａに、調湿剤が付加されていてもよい。これにより、木質壁材１Ａの裏面１２Ａ側の吸放湿性をさらに高めることができる。このような調湿剤は、吸湿性があり、そのまま、またはこれを水溶させ、これを木質壁材１Ａの裏面から塗布することにより、単板積層板３Ａの裏面３２Ａおよび溝壁面３５Ａに含浸させることができるものが好ましい。   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.

このような調湿剤としては、例えば、アルカリ金属の水酸化物（水酸化ナトリウム、水酸化カリウム等）、水溶性高分子（ポリエチレングリコール）、グリコール類（グリセリン、エチレングリコール等）、尿素誘導体、無機塩（塩化ナトリウム等）、水溶性アミン類（例えば、取りエタノールアミン）、アクリル酸塩（アクリル酸ソーダ、ポリアクリル酸ソーダ等）、ポリビニルアルコール類、酸ヒドラジド類、または糖類など吸水・吸湿性のある物質を挙げることができる。   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.

上述した実施形態に係る木質壁材１Ａによれば、木質壁材１Ａの裏面１２Ａに、複数の凹溝３４Ａ，３４Ａ…が形成されることにより、凹溝３４Ａを構成する単板積層板３Ａの溝壁面３５Ａから、木質壁材１Ａの木材の水分を吸放湿させることができる。これにより、木質壁材１Ａの吸放湿性能を高めることができる。ここで、中間層である単板３ｂの繊維断面（木口）が溝壁面３５Ａの一部を構成し、溝内部において露呈するので、木質壁材１Ａの吸放湿性を高めることができる。特に、発明者の経験上、木質繊維板２Ａに接合される単板３ａの木口を露出させる場合に比べて、中間層である単板３ｂの木口を露出させたほうが、凹溝３４Ａの底部から開口まで、木口から水分が拡散しやすいので、木質壁材１Ａの吸放湿性をさらに高めることができる。   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.

このように複数の凹溝３４Ａを設けることにより、木質壁材１Ａの吸放湿が高まり、さらに調湿剤を塗布した場合には、木質壁材１Ａの吸放湿がさらに高まる。この吸放湿時に、木質繊維板２Ａと単板積層板３Ａとが、膨潤・収縮するが、単板積層板３Ａの裏面３２Ａ側から木質繊維板２Ａの少なくとも裏面２２Ａに達するまで複数の凹溝３４Ａ，３４Ａ，…が形成されているので、凹溝３４Ａ，３４Ａを挟んだ位置の単板積層板３Ａは、それぞれ独立して膨潤・収縮することになる。これにより、木質繊維板２Ａと単板積層板３Ａの膨潤差または収縮差により生じるせん断力を抑え、木質壁材１Ａの反りを防止することができる。   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.

特に、本実施形態では、合板である単板積層板３Ａに形成された凹溝３４Ａが、接合面３１Ａを含む単板３ａの繊維方向に沿うように形成されているので、溝幅方向（短手方向Ｙ）に収縮しやすい接合面３１Ａの単板３ａの膨潤量・収縮量を抑えることができ、より一層、木質壁材１Ａの反りを防止することができる。   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.

上述した木質壁材１Ａの製造方法について、図２を参照して以下に説明する。図２は、図１に示す木質壁材１Ａの製造方法を説明するための図であり、（ａ）は、木質繊維板２Ａに、単板積層板（合板）３Ａを接合する工程を示した図、（ｂ）は、単板積層板３Ａに複数の凹溝３４Ａを切り込む工程を示した図である。   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.

まず、図２（ａ）に示すように、木質繊維板２Ａと、単板積層板３Ａとを準備し、酢酸ビニルエマルジョンのような水性の接着剤を、これらの少なくとも一方の表面（接合面）に塗布して、木質繊維板２Ａと単板積層板３Ａとを接合する。この際に、接着剤を介して、木質繊維板２Ａと、単板積層板３Ａと積層したものを熱圧処理により成形してもよい。   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.

ここで、実施形態では、酢酸ビニルエマルジョンを用いたが、例えば、エチレン酢酸ビニル樹脂、合成ゴム、ニカワなどの熱可塑性樹脂、また、上記を架橋できるように変性した樹脂、ウレタン樹脂、エポキシ樹脂、尿素・メラミン共縮合樹脂、フェノール樹脂等の熱硬化性樹脂がある。通常取扱いの容易な水性樹脂を用いるが、問題なければ油性樹脂を用いてもよい。   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.

次に、図２（ｂ）に示すようにして、単板積層板３Ａの裏面３２Ａ側から木質繊維板２Ａの少なくとも裏面２２Ａに達するまで（本実施形態では、木質繊維板２Ａの裏面２２Ａの表層２３Ａまで）、のこ（丸のこ）９を用いて単板積層板３Ａに複数の凹溝３４Ａ，３４Ａ，…を切り込んで溝加工を行う。より具体的には、木質繊維板２Ａの裏面２２Ａに接合される接合面３１Ａを含む単板３ａの繊維方向に沿うように、複数の凹溝３４Ａ，３４Ａ，…を切り込む。   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.

ここで、本実施形態では、のこ９で木質繊維板２Ａの裏面２２Ａの表層２３Ａまで凹溝３４の切り込みを行っているが、これは、凹溝３４Ａの底面の一部に付着（接着された）単板３ａの残材を完全に取り除くためである。   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.

また、このような溝加工は、レーザー加工、ウォータージェット加工、超音波カッター、エンドミル（ルーター）、ナイフ刃、トムソン刃、等の従来知られている加工手段により加工することができる。   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.

このように、単板積層板３Ａの裏面３２Ａ側から木質繊維板２Ａの裏面２２Ａの表層２３Ａまで、凹溝３４Ａを切り込むので、接合した単板３ａの一部の木材が残存することがなく、これによる木質壁材１Ａの反り、波うちを低減することができる。   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.

また、凹溝３４Ａを単板積層板３Ａの裏面３２Ａ側から木質繊維板２Ａの裏面２２Ａまで加工した場合、上述したのこを用いた場合には、この刃の刃先の形状から、凹溝３４Ａの底部に、接合した単板３ａの一部の木材が接着状態で残存しやすく、これにより、吸放湿時に木質壁材の反り、波打ちなどの変形が懸念される。しかしながら、このような場合であっても、木質繊維板２Ａの裏面２２Ａに接合される接合面３１Ａを含む単板３ａの繊維方向に沿うように、凹溝３４Ａを切り込んだので、吸放湿を起因とした木質壁材の反り、波打ちなどの変形を抑えることができる。   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.

図３は、第２の発明に係る本実施形態の木質壁材の模式図であり、（ａ）は、木質壁材を裏面側から見た斜視図、（ｂ）は、（ａ）の長手方向から見た側面図、（ｃ）は、（ａ）の木質繊維板の製造方法を説明するための側面図である。なお、図１に示す実施形態と同じ機能を有する部材については、その末尾の符号ＡをＢに変更し、その詳細な説明は一部省略する。   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.

図３（ａ）、（ｂ）に示すように、第２の発明に係る木質壁材１Ｂは、木質繊維板２Ｂと、木質繊維板２Ｂの裏面２２Ｂに接合された単板積層板３Ｂと、を少なくとも備えている。この木質繊維板２Ｂの材質及び寸法等は、上述したものと同じであり、図１に示す形態の木質繊維板２Ａと相違する点は、木質繊維板２Ｂの表層２３Ｂには、凹溝３４Ｂの一部が形成されていない点である。   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.

すなわち、本実施形態では、単板積層板３Ｂは、複数に分割された分割積層部材３０Ｂ，３０Ｂ，…を含み、分割積層部材３０Ｂ，３０Ｂ同士は、間隔をあけて木質繊維板２Ｂの裏面２２Ｂに、上述した接着剤を介して接合されている。   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.

分割積層部材３０Ｂは、３枚の単板３ａ，３ｂ，３ｃを厚さ方向に積層した合板から成形されたものであり、３枚の単板３ａ，３ｂ，３ｃの繊維方向が交互に交差するように、単板を積層した合板により成形された部材である。各分割積層部材３０Ｂ，３０Ｂ，…は、間隔をあけて配置した分割積層部材３０Ｂ，３０Ｂ同士の間に形成された凹溝３４Ｂが、木質繊維板２Ｂの裏面２２Ａに接合される接合面３１Ｂを含む単板３ａの繊維方向に沿うように配置されている。   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.

このような凹溝３４Ｂは、分割積層部材３０Ｂの形状と、これらの間の間隔によって決定されるものであり、溝ピッチおよび溝幅は、上述した範囲であり、溝深さは、分割積層部材そのものの厚みである。図３では、図１に示す実施形態の如き凹溝を示しているが、特にこの形状に限定されるものではなく、例えば、図３の短手方向Ｙに沿った凹溝がさらに形成されていてもよい。   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.

本実施形態によれば、分割積層部材３０Ｂ，３０Ｂ同士が、間隔をあけて木質繊維板２Ｂの裏面２２Ｂに接合されているので、分割積層部材３０Ｂ，３０Ｂ同士の隙間から、木質壁材１Ｂの木材の水分を吸放湿させることができる。これにより、木質壁材１Ｂの吸放湿性能を高めることができる。積層された単板のうち、中間層の単板３ｂの繊維断面（木口）が溝内部において露呈するので、木質壁材１Ｂの吸放湿性をさらに高めることができる。   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.

さらに、木質壁材１Ｂの吸放湿が高まることにより、吸放湿時に、木質繊維板２Ｂと単板積層板３Ｂとが、膨潤・収縮するが、単板積層板３Ｂは、複数に分割された分割積層部材３０Ｂからなるので、分割積層部材３０Ｂは、独立して膨潤・収縮することになる。これにより、単板積層板全体と木質繊維板との膨潤差または収縮差により生じるせん断力を抑え、木質壁材１Ｂの反りを防止することができる。特に、分割積層部材３０Ｂ，３０Ｂ同士の間に形成された凹溝３４Ｂが、接合面３１Ｂを含む単板３ａの繊維方向に沿って形成されているので、溝幅方向（短手方向Ｙ）に収縮しやすい接合面の単板３ａの膨潤量・収縮量を抑えることができる。これにより単板３ａと木質繊維板２Ｂとの間に生じるせん断力をより確実に抑え、木質壁材１Ｂの反りを抑えることができる。また、本実施形態では、木質繊維板２Ｂの裏面２２Ｂの表層２３Ｂに、凹溝３４Ｂが達していないので、木質壁材１Ｂの強度を確保することができる。   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.

上述した木質壁材１Ｂは、図３（ｃ）に示すように、木質繊維板２Ｂと複数の分割積層部材３０Ｂを準備し、上述した酢酸ビニルエマルジョンのような水性の接着剤を、これらの少なくとも一方の表面（接合面）に塗布して、分割積層部材３０Ｂ，３０Ｂ同士を上述した凹溝３４Ｂが形成されるように、木質繊維板２Ｂと分割積層部材３０Ｂとを接合する。この際に、接着剤を介して、木質繊維板２Ｂと、分割積層部材３０Ｂと積層したものを熱圧処理により成形してもよい。また、木質壁材１Ｂを補強するための補強プレートをさらに、木質壁材１Ｂに隣接して配置してもよい。   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.

上述した木質壁材１Ａまたは１Ｂを備えた壁構造１０Ａまたは１０Ｂを以下に説明する。図４は、図１及び図３に示す木質壁材が配置された壁構造の模式的斜視図である。図４に示すように、壁構造１０Ａ（１０Ｂ）は、複数の木質壁材１Ａ（１Ｂ）を備えた壁構造１０Ａ（１０Ｂ）であって、木質壁材１Ａ（１Ｂ）の裏面１２Ａ（１２Ｂ）を、桟木８，８を介して対面させ、木質壁材１Ａ（１Ｂ）の裏面１２Ａ（１２Ｂ）と、壁下地材Ｗとの間に間隙（空間）Ｓが形成されるように、木質壁材１Ａ（１Ｂ）が配置されている。   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.

このように、木質壁材１Ａ（１Ｂ）の裏面と壁下地材Ｗとの間に、木質壁材１Ａ（１Ｂ）の吸放湿するための間隙Ｓが形成されるので、木質壁材１Ａ（１Ｂ）の裏面１２Ａ（１２Ａ）の吸放湿性を高めることができる。また、短手方向の木質壁材１Ａ（１Ｂ）の強度は、実質的には、木質繊維板２Ａ（２Ｂ）に依存するので、たとえ僅かに木質壁材１Ａ（１Ｂ）が短手方向に反ったとしても、桟木に倣うようにその反りを容易に矯正することができる。また、桟木だけでなく金具などで固定することもできる。   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.

以下に本発明を実施例により説明する。
〔実施例１〕
以下に示すようにして、木質壁材を製作した。１８２０ｍｍ×９１０ｍｍ×厚さ５．５ｍｍのＭＤＦ（木質繊維板）と、１８２０ｍｍ×９１０ｍｍ×厚さ９ｍｍ（単板２．５ｍｍ＋４ｍｍ＋２．５ｍｍ）の３プライのスギ合板（単板積層板）と準備し、これらを酢酸ビニルエマルジョン接着剤を介して接合（接着）した。なお、ＭＤＦに接合される接合面を有する単板（２．５ｍｍ厚の単板）が、長手方向に繊維方向が沿うように、ＭＤＦに合板を接合する。 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.

次に、丸のこを用いて、合板の裏面から、木質繊維板の表層まで、溝深さ９．５ｍｍ（以下の表１参照）、短手方向に溝ピッチ１０ｍｍ、溝幅３ｍｍの凹溝を長手方向に沿って形成した。すなわち、この溝は、ＭＤＦの表層の一部に達した凹溝であり、ＭＤＦに接合される接合面を有する単板（２．５ｍｍ厚の単板）に沿った矩形状の凹溝である。   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. .

〔比較例１〕
実施例１と同じようにして、木質壁材を製作した。実施例１と相違する点は、以下の表１に示すように、ＭＤＦの裏面側から木質繊維板の少なくとも裏面に達しないように、溝深さ、５ｍｍ、６．５ｍｍ、７．５ｍｍの溝をそれぞれの木質壁材に対して形成した点である。 [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.

〔反りの測定〕
実施例１及び比較例１の木質壁材を、６０℃で２４時間乾燥した後、４０℃、ＲＨ９０％の環境に、６日間静置し、平置きした状態の短手方向の矢高を測定した。この結果を表１に示す。木質壁材の中央部が裏面側に膨らむように、木質壁材が反っているときは、両縁部に対する中央部の高さを矢高（＋）とし、木質壁材の中央部が表面側に膨らむように、木質壁材が反っているときは、両縁部に対する中央部の高さを矢高（−）として測定した。 [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 (-).

Figure 0005872784
Figure 0005872784

〔結果１及び考察１〕
（１）実施例１の木質壁材の矢高は、比較例１のものに比べて小さく、木質壁材の反りが小さかった。（２）比較例１のうち、溝深さ５ｍｍの木質壁材の矢高は、他の比較例１のものに比べて、小さかった。 [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.

（１）に示す結果となったのは、実施例１の木質壁材の場合、合板層を完全に断ち切るように凹溝を形成したことにより、合板とＭＤＦに生じるせん断応力を分散することができたからであると考えられる。   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.

（２）に示す結果となったのは、木質繊維板と合板に、これらの間に生じるせん断応力に対して変形しないような剛性があった（木質繊維板と合板の剛性のバランス取れていた）ためであると考えられる。しかしながら、溝深さ５ｍｍの木質壁材の場合には、合板２層目（中間層の単板）の木口が露呈している割合が少ないので、他の木質壁材に比べて吸放湿の性能は低いと考えられる。   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.

このように、実施例１の如く、合板の裏面から、木質繊維板のすくなくとも裏面に達するように凹溝深さの凹溝を形成すればよく、比較例１に示す木質壁材の如く、木質繊維板と合板の剛性のバランスを考えて、最適な溝深さ（例えば上述した場合５ｍｍの溝深さ）を決定する必要はない。   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.

〔実施例２〕
実施例１と同じようにして、木質壁材を製作した。実施例１と相違する点は、１８２０ｍｍ×９１０ｍｍ×厚さ２．７ｍｍのＭＤＦ（木質繊維板）を用いた点である。 [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.

〔比較例２〕
実施例２と同じようにして、木質壁材を製作した。実施例２と相違する点は、以下の表２に示すように、ＭＤＦの裏面側から木質繊維板の少なくとも裏面に達しないように、溝深さ、６．５ｍｍ、７．５ｍｍ、８．５ｍｍの溝をそれぞれの木質壁材に対して形成した点である。 [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.

〔反りの測定〕
実施例１と同じようにして、実施例２及び比較例２の木質壁材を、６０℃で２４時間（１日）乾燥した後、平置きした状態の短手方向の矢高、および、４０℃、ＲＨ９０％の環境に、６日間静置し、平置きした状態の短手方向の矢高を測定した。この結果を表２に示す。 [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.

Figure 0005872784
Figure 0005872784

〔結果２及び考察２〕
実施例２の木質壁材の矢高は、比較例２のものに比べて小さく、木質壁材の反りが小さかった。表１及び表２の結果から、ＭＤＦの厚さに関係なく、合板層を完全に断ち切るように凹溝を形成したことにより、合板とＭＤＦに生じるせん断応力を分散することができ、これにより、木質壁材の反りを低減することができると考えられる。 [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.

〔実施例３〕
実施例１と同じようにして、木質壁材を製作した。実施例１と相違する点は、１８２０ｍｍ×９１０ｍｍ×厚さ１２ｍｍ（単板２ｍｍ＋３ｍｍ＋２ｍｍ＋３ｍｍ＋３ｍｍ）の５プライのスギ合板（単板積層板）を用い、溝深さを１２．１ｍｍにした点である。 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.

〔比較例３〕
実施例２と同じようにして、木質壁材を製作した。実施例２と相違する点は、以下の表３に示すように、ＭＤＦの裏面側から木質繊維板の少なくとも裏面に達しないように、溝深さ、５ｍｍ、１０ｍｍ、１１．９ｍｍの溝をそれぞれの木質壁材に対して形成した点である。 [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.

〔反りの測定〕
実施例１と同じようにして、実施例３及び比較例３の木質壁材を、６０℃で２４時間（１日）乾燥した後、平置きした状態の短手方向の矢高、および、４０℃、ＲＨ９０％の環境に、６日間静置し、平置きした状態の短手方向の矢高を測定した。この結果を表３に示す。 [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.

Figure 0005872784
Figure 0005872784

〔結果３及び考察３〕
（３）実施例３の木質壁材の矢高は、比較例３のものに比べて小さく、木質壁材の反りが小さかった。（４）比較例３のうち、４０℃、ＲＨ９０％の試験後の溝深さ５ｍｍの木質壁材の矢高は、他の比較例３のものに比べて、小さかった。 [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.

表１および（３）に示す結果から、合板の厚さに関係なく、合板層を完全に断ち切るように凹溝を形成したことにより、合板とＭＤＦに生じるせん断応力を分散することができ、これにより、木質壁材の反りを低減することができると考えられる。なお（４）に示す結果となったのは、上述した（２）（比較例１参照）と同様に、木質繊維板と合板に、これらの間に生じるせん断応力に対して変形しないような剛性があったためであると考えられる。   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.

以上、本発明の実施形態について詳述したが、本発明は、前記の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の精神を逸脱しない範囲で、種々の設計変更を行うことができるものである。   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.

たとえば、本実施形態では、単板積層板は、３枚の単板を積層したものであったが、単板の枚数は複数枚であれば、特に限定されるものではない。   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：木質壁材、２Ａ，２Ｂ：木質繊維板、３Ａ，３Ｂ：単板積層板、３ａ，３ｂ，３ｃ：単板、８：桟木、９：のこ、１０Ａ，１０Ｂ：壁構造、１１Ａ，１１Ｂ：木質壁材の表面、１２Ａ，１２Ｂ：木質壁材の裏面、２１Ａ，２１Ｂ：木質繊維板の表面、２２Ａ，２２Ｂ：木質繊維板の裏面、２３Ａ，２３Ｂ：木質繊維板の表層、３０Ｂ：分割積層部材、３１Ａ，３１Ｂ：単板積層板の接合面、３２Ａ，３２Ｂ：単板積層板の裏面、３４Ａ，３４Ｂ：凹溝、３５Ａ，３５Ｂ：溝壁面、Ｗ：壁下地材、Ｘ：長手方向、Ｙ：短手方向   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)

木質繊維板と、該木質繊維板の裏面に接合された単板積層板と、を少なくとも備えた木質壁材であって、
前記木質壁材は、前記単板積層板の裏面側から前記木質繊維板の少なくとも裏面に達するまで複数の凹溝が形成されており、
前記単板積層板は、複数の単板の繊維方向が交差するように前記単板を積層した合板であり、前記凹溝は、前記木質繊維板の裏面に接合される接合面を含む単板の繊維方向に沿うように形成されていることを特徴とする木質壁材。 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. 木質繊維板と、該木質繊維板の裏面に接合された単板積層板と、を少なくとも備えた木質壁材であって、
前記単板積層板は、複数に分割された分割積層部材からなり、前記分割積層部材同士は、間隔をあけて前記木質繊維板の裏面に接合されており、
各分割積層部材は、複数の単板の繊維方向が交差するように前記単板を積層した合板により形成されており、各分割積層部材は、前記間隔をあけて配置した分割積層部材同士の間に形成された凹溝が、前記木質繊維板の裏面に接合される接合面を含む単板の繊維方向に沿うように配置されていることを特徴とする木質壁材。 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. 木質繊維板と単板積層板とを少なくとも備えた木質壁材を製造する方法であって、
前記木質繊維板の裏面に単板積層板を接合する工程と、
前記単板積層板の裏面側から前記木質繊維板の少なくとも裏面に達するまで、前記単板積層板に複数の凹溝を切り込む工程と、を少なくとも含み、
前記単板積層板に、複数の単板の繊維方向が交差するように前記単板を積層した合板を用い、
前記木質繊維板の裏面に接合される接合面を含む単板の繊維方向に沿うように、前記凹溝を切り込むことを特徴とする木質壁材の製造方法。 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. 請求項１または２に記載の木質壁材を備えた壁構造であって、前記木質壁材の裏面と、壁下地材との間に間隙が形成されるように、前記木質壁材が配置されていることを特徴とする壁構造。 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 請求項１または２に記載の木質壁材、または請求項３に記載の製造方法により製造された木質壁材を備えた壁構造の製造方法であって、前記木質壁材の裏面と、壁下地材との間に間隙が形成されるように、前記木質壁材を配置することを特徴とする壁構造の製造方法。 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.
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