JP6872737B2 - Floor material - Google Patents

Floor material Download PDF

Info

Publication number
JP6872737B2
JP6872737B2 JP2016145867A JP2016145867A JP6872737B2 JP 6872737 B2 JP6872737 B2 JP 6872737B2 JP 2016145867 A JP2016145867 A JP 2016145867A JP 2016145867 A JP2016145867 A JP 2016145867A JP 6872737 B2 JP6872737 B2 JP 6872737B2
Authority
JP
Japan
Prior art keywords
layer
veneer
floor
thickness
floor material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2016145867A
Other languages
Japanese (ja)
Other versions
JP2017125390A (en
Inventor
健一郎 柴田
健一郎 柴田
鈴木　伸一
伸一 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Publication of JP2017125390A publication Critical patent/JP2017125390A/en
Application granted granted Critical
Publication of JP6872737B2 publication Critical patent/JP6872737B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Floor Finish (AREA)

Description

本発明は、床材に関する。 The present invention relates to a flooring material.

従来より、複数枚の単板を積層した合板を基材とする木質系の床材が知られている。このような床材は、比較的に剛性があるため、段差等が形成され易いフリーアクセスフロア（ＯＡフロア）等の床下地（二重床下地）上に施工した場合には、段差やがたつきが生じ易くなるという問題があった。
例えば、下記特許文献１には、合板基材層の表面側に化粧層を設け、裏面側に遮音層を設けた木質系床材が開示されている。また、この木質系床材は、合板基材層の裏面側に、床材幅方向に延び、かつ裏面側に開放する裏溝を、その上端が上から２層目の単板の層内に位置するように床材長さ方向に間隔をおいて複数形成した構成とされている。 Conventionally, a wood-based flooring material based on plywood in which a plurality of veneers are laminated has been known. Since such a floor material is relatively rigid, when it is installed on a floor base (double floor base) such as a free access floor (OA floor) where steps or the like are likely to be formed, the step or rattling occurs. There was a problem that sticking was likely to occur.
For example, Patent Document 1 below discloses a wood-based flooring material in which a decorative layer is provided on the front surface side of a plywood base material layer and a sound insulation layer is provided on the back surface side. Further, this wood-based flooring material has a back groove extending in the width direction of the flooring material and opening to the back side on the back surface side of the plywood base material layer, and the upper end thereof is in the layer of the second veneer from the top. The structure is such that a plurality of floor materials are formed at intervals in the length direction of the floor material so as to be located.

特開２０１４−１６１５号公報Japanese Unexamined Patent Publication No. 2014-1615

しかしながら、上記特許文献１に記載された木質系床材は、上記のように比較的に深い裏溝が形成された構成とされているので、湿度変化や日光に晒されるなどの環境変化によって反りが生じ易くなることが考えられた。 However, since the wood-based flooring material described in Patent Document 1 has a structure in which a relatively deep back groove is formed as described above, it warps due to environmental changes such as humidity change and sunlight exposure. Was considered to be more likely to occur.

本発明は、上記実情に鑑みてなされたものであり、段差やがたつきの発生を抑制可能でありながらも、反りを抑制し得る床材を提供することを目的としている。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a flooring material capable of suppressing warpage while being able to suppress the occurrence of steps and rattling.

上記目的を達成するために、本発明に係る床材は、一方向に長尺状とされ、合板基材層の表面側に表面化粧層を設けた床材であって、前記表面化粧層は、防湿層を含んだ構成とされており、前記合板基材層は、床材長手方向に繊維方向を沿わせた奇数層の単板と床材幅方向に繊維方向を沿わせた偶数層の単板とからなる３枚以上で奇数枚の単板を積層した構成とされ、かつ、床材幅方向の全体に亘って延びるように裏面側において開口する複数本の溝が設けられた構成とされ、これら複数本の溝は、これら複数本の溝によって床材長手方向に区分される当該床材の床材長手方向に間隔を空けた部位同士が床下地の段差に追従して床材厚さ方向に相対的に変位可能なように、床材長手方向に間隔を空けて、かつ前記合板基材層の表面側から二枚目の単板の溝底側の残り厚さが該合板基材層の表面側から一枚目の単板の厚さの５／１０〜７／１０となるように溝底が前記二枚目の単板の層内に位置するように設けられており、前記合板基材層の裏面には、前記床材厚さ方向への変位に追従可能で、かつ前記合板基材層への裏面側からの吸湿を抑制し得る、厚さが０．５ｍｍ以下の裏面シートが前記複数本の溝の裏面側開口を塞ぐように略全面に亘って貼着され、当該床材が施工された状態で、該裏面シートが前記床下地に当接されることを特徴とする。 In order to achieve the above object, the flooring material according to the present invention is a flooring material which is elongated in one direction and has a surface decorative layer provided on the surface side of the plywood base material layer. The plywood base material layer is composed of an odd-sized single plate having the fiber direction along the floor material longitudinal direction and an even layer having the fiber direction along the floor material width direction. A configuration in which an odd number of single plates are laminated with three or more single plates, and a configuration in which a plurality of grooves are provided on the back surface side so as to extend over the entire width direction of the floor material. The plurality of grooves are divided in the longitudinal direction of the floor material by the plurality of grooves, and the portions of the floor material spaced apart from each other in the longitudinal direction of the floor material follow the steps of the floor base to form the floor material thickness. The remaining thickness on the groove bottom side of the second single plate from the surface side of the plywood base material layer is the plywood base at intervals in the longitudinal direction of the floor material so that it can be relatively displaced in the longitudinal direction. The groove bottom is provided so as to be located in the layer of the second plywood so that the thickness of the first plywood is 5/10 to 7/10 from the surface side of the material layer. The back surface of the plywood base material layer has a thickness of 0.5 mm or less, which can follow the displacement in the floor material thickness direction and can suppress moisture absorption from the back surface side to the plywood base material layer. It is stuck over substantially the entire surface so backsheet closes the back side opening of the plurality of grooves, in a state in which the flooring is construction, characterized in that the back sheet is Ru is contact with the subfloor And.

また、上記目的を達成するために、本発明に係る床材は、一方向に長尺状とされ、合板基材層の表面側に表面化粧層を設けた床材であって、前記表面化粧層は、防湿層を含んだ構成とされており、前記合板基材層は、床材長手方向に繊維方向を沿わせた奇数層の単板と床材幅方向に繊維方向を沿わせた偶数層の単板とからなる３枚以上で奇数枚の単板を積層した構成とされ、かつ、床材幅方向の全体に亘って延びるように裏面側において開口する複数本の溝が設けられた構成とされ、これら複数本の溝は、これら複数本の溝によって床材長手方向に区分される当該床材の床材長手方向に間隔を空けた部位同士が床下地の段差に追従して床材厚さ方向に相対的に変位可能なように、床材長手方向に間隔を空けて、かつ前記合板基材層の表面側から二枚目の単板の溝底側の残り厚さが該合板基材層の表面側から一枚目の単板の厚さの５／１０〜７／１０となるように溝底が前記二枚目の単板の層内に位置するように設けられており、前記合板基材層の裏面には、前記床材厚さ方向への変位に追従可能で、かつ前記複数本の溝の裏面側開口を拡開させる側への前記合板基材層の反りを拘束するように抑制し得る、厚さが１．０ｍｍ以下の裏面層が略全面に亘って設けられ、当該床材が施工された状態で、該裏面層が前記床下地に当接されることを特徴とする。 Further, in order to achieve the above object, the flooring material according to the present invention is a flooring material which is elongated in one direction and has a surface decorative layer provided on the surface side of the plywood base material layer. The layer is configured to include a moisture-proof layer, and the plywood base material layer is an odd-sized single plate having a fiber direction along the floor material longitudinal direction and an even number along the fiber direction along the floor material width direction. It is composed of three or more single plywood layers and an odd number of plywood laminated, and is provided with a plurality of grooves that open on the back surface side so as to extend over the entire width direction of the floor material. These plurality of grooves are divided in the longitudinal direction of the floor material by the plurality of grooves, and the parts of the floor material spaced apart from each other in the longitudinal direction of the floor material follow the steps of the floor base. The remaining thickness on the groove bottom side of the second single plate from the surface side of the plywood base material layer is the remaining thickness at intervals in the longitudinal direction of the floor material so that it can be relatively displaced in the material thickness direction. The groove bottom is provided so as to be located in the layer of the second single plate so as to be 5/10 to 7/10 of the thickness of the first single plate from the surface side of the plywood base material layer. The back surface of the plywood base material layer can follow the displacement in the floor material thickness direction, and the plywood base material layer warps toward the side where the back surface side openings of the plurality of grooves are widened. can suppress to restrain the thickness is provided below the rear surface layer 1.0mm is over substantially the entire surface, in a state in which the flooring is the construction, back surface layer is Ru is contact with the subfloor It is characterized by that.

本発明に係る床材は、上述のような構成としたことで、段差やがたつきの発生を抑制可能でありながらも、反りを抑制することができる。 By adopting the floor material according to the present invention as described above, it is possible to suppress the occurrence of steps and rattling, but also to suppress the warp.

（ａ）は、本発明の一実施形態に係る床材の一例を模式的に示す一部破断概略縦断面図、（ｂ）〜（ｄ）は、本発明の他の実施形態に係る床材の一例をそれぞれ模式的に示す一部破断概略縦断面図である。(A) is a partially fractured schematic vertical sectional view schematically showing an example of the floor material according to one embodiment of the present invention, and (b) to (d) are floor materials according to another embodiment of the present invention. It is a partial fracture schematic vertical sectional view schematically showing an example. （ａ）〜（ｄ）は、本発明の更に他の実施形態に係る床材の一例をそれぞれ模式的に示す一部破断概略縦断面図である。(A) to (d) are partial fracture schematic vertical sectional views schematically showing an example of a floor material according to still another embodiment of the present invention. 本発明に係る床材の実施例と比較例とを評価試験の結果とともに示す表である。It is a table which shows the example and the comparative example of the floor material which concerns on this invention together with the result of the evaluation test.

以下に本発明の実施の形態について、図面に基づいて説明する。
なお、図１（ａ）〜（ｄ）及び図２（ａ）〜（ｄ）では、各実施形態に係る床材を幅方向に分断するように切断した状態、つまり、各実施形態に係る床材の長手方向両端側が図示されるように切断した状態における縦断面図としている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, in FIGS. 1A to 1D and FIG. 2A to 2D, the floor material according to each embodiment is cut so as to be divided in the width direction, that is, the floor according to each embodiment. It is a vertical cross-sectional view in a state where both ends in the longitudinal direction of the material are cut as shown in the drawing.

図１（ａ）は、第１実施形態に係る床材の一例を模式的に示す図である。
本実施形態に係る床材１は、図１（ａ）に示すように、一方向に長尺状とされ、合板基材層１０の表面（上面）側に表面化粧層２０を設けた構成とされている。
この床材１は、略矩形平板状とされており、設置対象としての床下地２上に床材長手方向及び床材幅方向に複数枚が並べられて床面を構成する。この床材１は、床下地２にねじや釘等の止具や、接着剤等を用いて施工されるものとしてもよく、または、このような止具や接着剤等を用いずに、床下地２上にいわゆる置敷床的に施工されるものとしてもよい。また、床下地２としては、例えば、根太や床下地ボード、床スラブ等でもよく、また、いわゆるフリーアクセスフロア（ＯＡフロア）等の二重床下地でもよい。また、このような二重床下地としては、正方形状の下地パネルの裏面側（下面側）に配線等の空間が設けられるように支柱が設けられたようなものとしてもよい。 FIG. 1A is a diagram schematically showing an example of a floor material according to the first embodiment.
As shown in FIG. 1A, the floor material 1 according to the present embodiment has a structure in which it is elongated in one direction and a surface decorative layer 20 is provided on the surface (upper surface) side of the plywood base material layer 10. Has been done.
The floor material 1 has a substantially rectangular flat plate shape, and a plurality of sheets are arranged on the floor base 2 as an installation target in the longitudinal direction of the floor material and the width direction of the floor material to form a floor surface. The floor material 1 may be installed on the floor base 2 using fasteners such as screws and nails, an adhesive, or the like, or under the floor without using such fasteners or adhesives. It may be constructed on the ground 2 as a so-called laying floor. Further, the floor base 2 may be, for example, a joist, a floor base board, a floor slab, or the like, or a double floor base such as a so-called free access floor (OA floor). Further, as such a double floor base, a support column may be provided so that a space such as wiring is provided on the back surface side (lower surface side) of the square base panel.

この床材１の長さ寸法や幅寸法、厚さ寸法等は、一般的な床材の各寸法と概ね同寸法としてもよい。例えば、床材１を、長さ寸法が１５００ｍｍ〜２０００ｍｍ程度、幅寸法が２５０ｍｍ〜５００ｍｍ程度とされた長尺板状体としてもよい。また、床材１を、置敷床的に施工されるものとした場合には、上記よりも小さい寸法としてもよい。例えば、床材１を、長さ寸法が６００ｍｍ〜１２００ｍｍ程度、幅寸法が１００ｍｍ〜２００ｍｍ程度とされたものとしてもよい。
また、床材１は、厚さ寸法が５ｍｍ〜３０ｍｍ程度とされたものとしてもよく、５ｍｍ〜１５ｍｍ程度とされたものとしてもよい。 The length dimension, width dimension, thickness dimension, etc. of the floor material 1 may be substantially the same as each dimension of the general floor material. For example, the floor material 1 may be a long plate-like body having a length dimension of about 1500 mm to 2000 mm and a width dimension of about 250 mm to 500 mm. Further, when the floor material 1 is constructed as a floor, the dimensions may be smaller than the above. For example, the floor material 1 may have a length dimension of about 600 mm to 1200 mm and a width dimension of about 100 mm to 200 mm.
Further, the floor material 1 may have a thickness dimension of about 5 mm to 30 mm, or may have a thickness of about 5 mm to 15 mm.

また、本実施形態では、床材１の長手方向両端部に、長手方向に隣り合う床材１に接合される実部３，４を設けた構成としている。図例では、長手方向一端部に、床材長手方向外方側に向けて突出する雄実部３を設け、長手方向他端部に、床材長手方向外方側に向けて開口する雌実部４を設けた構成としている。つまり、長手方向両端部に本実状の実部３，４を設けた例を示している。また、床材１の幅方向両端部の図示を省略しているが、幅方向両端部には幅方向に隣り合う床材１に接合される実部を設けていない構成としてもよい。つまり、床材１の幅方向両端面を、幅方向外方側に向く平坦な垂直面状としてもよい。また、実部に代えて、床材１の幅方向両端部に、治具等の差込凹所を設けた構成としてもよい。このような差込凹所としては、床材長手方向に延びるように全長に亘って溝状に設けられたものとしてもよい。または、床材１の幅方向両端部にも、上記同様な実部３，４を設けた構成としてもよく、このような本実に代えて、床材１の四周端部に相じゃくり状の実部を設けた構成としてもよい。また、図例では、床材１の長手方向両端部の表面側縁部にＣ面取り状の面取り部が設けられた例を示しているが、床材１の幅方向両端部の表面側縁部にも同様な面取り部が設けられたものとしてもよい。 Further, in the present embodiment, the actual portions 3 and 4 to be joined to the floor materials 1 adjacent to each other in the longitudinal direction are provided at both ends of the floor material 1 in the longitudinal direction. In the illustrated example, a male fruit portion 3 is provided at one end in the longitudinal direction and protrudes outward in the longitudinal direction of the floor material, and a female fruit is opened at the other end in the longitudinal direction toward the outward side in the longitudinal direction of the floor material. The structure is such that the part 4 is provided. That is, an example is shown in which real parts 3 and 4 are provided at both ends in the longitudinal direction. Further, although the illustration of both ends in the width direction of the floor material 1 is omitted, a configuration may be configured in which both ends in the width direction are not provided with actual parts to be joined to the floor materials 1 adjacent to each other in the width direction. That is, both end faces in the width direction of the floor material 1 may be formed as a flat vertical plane facing outward in the width direction. Further, instead of the actual portion, the floor material 1 may be provided with insertion recesses such as jigs at both ends in the width direction. Such an insertion recess may be provided in a groove shape over the entire length so as to extend in the longitudinal direction of the floor material. Alternatively, the floor material 1 may be provided with the same actual parts 3 and 4 at both ends in the width direction. It may be configured to have a real part. Further, in the illustrated example, a C-chamfered chamfered portion is provided on the surface side edges of both ends in the longitudinal direction of the floor material 1, but the surface side edges of both ends in the width direction of the floor material 1 are shown. May be provided with a similar chamfered portion.

合板基材層１０は、床材長手方向に繊維方向を沿わせた奇数層の単板１１，１３，１５と床材幅方向に繊維方向を沿わせた偶数層の単板１２，１４とからなる３枚以上で奇数枚の単板１１，１２，１３，１４，１５を積層した構成とされている。また、合板基材層１０は、床材幅方向の全体に亘って延びるように裏面側において開口する複数本の溝１８が設けられた構成とされている。
本実施形態では、合板基材層１０を、５枚の単板１１，１２，１３，１４，１５を積層したいわゆる５プライ合板としている。つまり、本実施形態では、合板基材層１０は、表面側から一枚目の単板としての第１単板１１、表面側から二枚目の単板としての第２単板１２、第３単板１３、第４単板１４及び第５単板１５を表面側からこの順に積層した構成とされている。また、第１単板１１、第３単板１３及び第５単板１５が床材長手方向に繊維方向を沿わせた奇数層の単板を構成し、第２単板１２及び第４単板１４が床材幅方向に繊維方向を沿わせた偶数層の単板を構成する。これら単板１１，１２，１３，１４，１５の樹種としては、ラワンやシナノキ、カラマツ、パイン、杉等、種々の樹種が挙げられる。また、全ての単板１１，１２，１３，１４，１５の樹種を同一の樹種としてもよいが、複数の樹種を組み合わせた構成としてもよい。 The plywood base material layer 10 is composed of odd-numbered veneers 11, 13 and 15 along the fiber direction in the longitudinal direction of the floor material and even-numbered veneers 12 and 14 along the fiber direction in the width direction of the floor material. The structure is such that an odd number of veneers 11, 12, 13, 14, and 15 are laminated with three or more veneers. Further, the plywood base material layer 10 is configured to be provided with a plurality of grooves 18 which are opened on the back surface side so as to extend over the entire width direction of the floor material.
In the present embodiment, the plywood base material layer 10 is a so-called 5-ply plywood in which five veneers 11, 12, 13, 14, and 15 are laminated. That is, in the present embodiment, the plywood base material layer 10 is the first veneer 11 as the first veneer from the surface side, the second veneer 12 as the second veneer from the surface side, and the third veneer. The veneer 13, the fourth veneer 14, and the fifth veneer 15 are laminated in this order from the surface side. Further, the first veneer 11, the third veneer 13, and the fifth veneer 15 form an odd-numbered veneer in which the fiber direction is aligned in the longitudinal direction of the floor material, and the second veneer 12 and the fourth veneer are formed. 14 constitutes an even-layered veneer in which the fiber direction is aligned with the floor material width direction. Examples of the tree species of these veneers 11, 12, 13, 14, and 15 include various tree species such as lauan, linden, larch, pine, and cedar. Further, all the veneer 11, 12, 13, 14, and 15 tree species may be the same tree species, but a plurality of tree species may be combined.

また、これら単板１１，１２，１３，１４，１５の厚さは、合板基材層１０自体の厚さに応じて、また、各単板１１，１２，１３，１４，１５の成形性等の観点や、合板基材層１０の強度上の観点等から適宜の厚さとされたものとしてもよい。床材１の厚さ方向の大部分を占める合板基材層１０の厚さは、床材１の厚さ寸法に応じて適宜の寸法としてもよく、例えば、２．５ｍｍ以上としてもよく、３ｍｍ〜３０ｍｍ程度としてもよく、５ｍｍ〜１５ｍｍ程度としてもよい。また、各単板１１，１２，１３，１４，１５の厚さは、０．５ｍｍ〜５ｍｍ程度としてもよく、０．５ｍｍ〜３ｍｍ程度としてもよい。これら単板１１，１２，１３，１４，１５は、全てが同厚さとされたものとしてもよいが、少なくとも一枚が異なる厚さとされたものとしてもよい。好ましくは、床材幅方向に見て、合板基材層１０が厚さ方向中心線を対称軸として線対称状となるような層構成としてもよい。図例では、第１単板１１と第５単板１５とを同厚さとし、第２単板１２と第４単板１４とを同厚さとし、これら第２単板１２及び第４単板１４の厚さを、第１単板１１及び第５単板１５の厚さよりも大とした例を示している。また、第３単板１３の厚さを、第１単板１１及び第５単板１５の厚さよりも大とし、第２単板１２及び第４単板１４の厚さよりも小とした例を示している。また、合板基材層１０としては、複数枚の合板を適宜の接着剤等を介して積層一体化した構成とされたものでもよい。 Further, the thickness of these veneers 11, 12, 13, 14, 15 depends on the thickness of the plywood base material layer 10 itself, and the moldability of each veneer 11, 12, 13, 14, 15 and the like. The thickness may be appropriately adjusted from the viewpoint of the above and the strength of the plywood base material layer 10. The thickness of the plywood base material layer 10, which occupies most of the floor material 1 in the thickness direction, may be an appropriate dimension depending on the thickness dimension of the floor material 1, and may be, for example, 2.5 mm or more, or 3 mm. It may be about 30 mm or about 5 mm to 15 mm. The thickness of each veneer 11, 12, 13, 14, 15 may be about 0.5 mm to 5 mm or about 0.5 mm to 3 mm. All of these veneers 11, 12, 13, 14, and 15 may have the same thickness, but at least one of these veneers may have different thicknesses. Preferably, the plywood base material layer 10 may have a layer structure that is line-symmetrical with the center line in the thickness direction as the axis of symmetry when viewed in the width direction of the floor material. In the illustrated example, the first veneer 11 and the fifth veneer 15 have the same thickness, the second veneer 12 and the fourth veneer 14 have the same thickness, and the second veneer 12 and the fourth veneer 14 have the same thickness. An example is shown in which the thickness of the first veneer 11 and the fifth veneer 15 is larger than the thickness of the first veneer 11. Further, an example in which the thickness of the third veneer 13 is made larger than the thickness of the first veneer 11 and the fifth veneer 15 and smaller than the thickness of the second veneer 12 and the fourth veneer 14. Shown. Further, the plywood base material layer 10 may have a structure in which a plurality of plywoods are laminated and integrated with an appropriate adhesive or the like.

この合板基材層１０の裏面側に設けられた複数本の溝１８は、床材長手方向に間隔を空けて、かつ溝底が表面側から二枚目の単板としての第２単板１２の層内に位置するように設けられている。つまり、これら複数本の溝１８は、これら複数本の溝１８によって合板基材層１０の最裏面側となる第５単板１５、第４単板１４及び第３単板１３を床材長手方向に分断し、かつ第２単板１２の表面側の一部を残すように設けられている。つまりは、これら複数本の溝１８は、合板基材層１０の表面側となる第１単板１１には達しないように設けられている。また、これら複数本の溝１８は、これら複数本の溝１８によって床材長手方向に区分される当該床材１の床材長手方向に間隔を空けた部位同士が床下地２の段差（不陸）に追従して床材厚さ方向に相対的に変位可能なように設けられている。つまり、当該床材１が床下地２の段差を跨ぐように配されれば、当該床材１の長手方向に間隔を空けた部位同士が床材厚さ方向に相対的に変位し、当該床材１の裏面の概ね全面が床下地２に当接し、浮きやがたつきの抑制が可能とされている。また、これら複数本の溝１８を、床材幅方向に見て床材１が表面側に突湾曲状に変形可能で、隣り合う床材１との長手方向両端側の実接合の解除が可能なように設けてもよい。このような構成とすれば、床材１を置敷床的に施工すれば、施工後に一枚単位で床材１を容易に取り外すことができる。 The plurality of grooves 18 provided on the back surface side of the plywood base material layer 10 are spaced apart in the longitudinal direction of the floor material, and the groove bottom is the second veneer 12 as the second veneer from the front surface side. It is provided so as to be located in the layer of. That is, the plurality of grooves 18 are formed by forming the fifth veneer 15, the fourth veneer 14, and the third veneer 13 on the backmost side of the plywood base material layer 10 by the plurality of grooves 18 in the longitudinal direction of the floor material. It is provided so as to be divided into two parts and leave a part of the surface side of the second veneer 12. That is, these plurality of grooves 18 are provided so as not to reach the first veneer 11 which is the surface side of the plywood base material layer 10. Further, in the plurality of grooves 18, the portions of the floor material 1 which are separated in the longitudinal direction of the floor material by the plurality of grooves 18 are separated from each other in the longitudinal direction of the floor material, and the steps (displacement) of the floor base 2 are formed. ) Is provided so that it can be relatively displaced in the floor material thickness direction. That is, if the floor material 1 is arranged so as to straddle the step of the floor base 2, the portions of the floor material 1 spaced apart from each other in the longitudinal direction are relatively displaced in the floor material thickness direction, and the floor is concerned. Almost the entire back surface of the material 1 is in contact with the floor base 2, and it is possible to suppress floating and rattling. Further, the floor material 1 can be deformed in a curved shape toward the surface side when the plurality of grooves 18 are viewed in the width direction of the floor material, and the actual joints on both ends in the longitudinal direction with the adjacent floor material 1 can be released. It may be provided as follows. With such a configuration, if the floor material 1 is installed as a floor, the floor material 1 can be easily removed one by one after the construction.

これら複数本の溝１８は、溝深さ方向を床材厚さ方向に沿わせ、溝長手方向を床材幅方向に沿わせて設けられている。また、本実施形態では、これら複数本の溝１８を、床材長手方向に等間隔を空けて長手方向の略全体に亘って設けた構成としている。つまり、合板基材層１０の長手方向一端部から長手方向他端部に至るまで等間隔を空けて複数本の溝１８を設けた構成としている。また、各溝１８を、溝長手方向に見て略矩形溝状としている。つまり、各溝１８は、床材１の表裏面に平行状とされた溝底と床材長手方向に沿う方向に向き、互いに平行状とされた両溝側壁とによって区画されている。なお、このような態様に代えて、各溝１８を、溝長手方向に見て略Ｕ字溝状等としてもよい。
また、各溝１８の溝深さ寸法を、全て同一とし、各溝１８の溝幅寸法を、全て同一としている。 The plurality of grooves 18 are provided so that the groove depth direction is along the floor material thickness direction and the groove longitudinal direction is along the floor material width direction. Further, in the present embodiment, the plurality of grooves 18 are provided at equal intervals in the longitudinal direction of the floor material over substantially the entire longitudinal direction. That is, a plurality of grooves 18 are provided at equal intervals from one end in the longitudinal direction to the other end in the longitudinal direction of the plywood base material layer 10. Further, each groove 18 has a substantially rectangular groove shape when viewed in the longitudinal direction of the groove. That is, each groove 18 is partitioned by a groove bottom parallel to the front and back surfaces of the floor material 1 and both groove side walls parallel to each other in the direction along the longitudinal direction of the floor material 1. Instead of such an aspect, each groove 18 may have a substantially U-shaped groove shape or the like when viewed in the groove longitudinal direction.
Further, the groove depth dimension of each groove 18 is the same, and the groove width dimension of each groove 18 is the same.

これら複数本の溝１８の溝幅寸法や、隣り合う溝１８，１８間の寸法（溝間寸法）は、各溝１８の加工性や、床材１の強度上の観点、段差（不陸）追従性の観点等から適宜の寸法としてもよい。例えば、各溝１８の溝幅寸法を、１ｍｍ〜５ｍｍ程度としてもよく、好ましくは、１ｍｍ〜３ｍｍ程度としてもよい。この溝幅寸法を小さくし過ぎれば、加工性や不陸追従性が低下する傾向があり、溝幅寸法を大きくし過ぎれば、強度が低下する傾向がある。また、溝間寸法を、５ｍｍ〜２０ｍｍ程度としてもよく、好ましくは、５ｍｍ〜１５ｍｍ程度としてもよい。この溝間寸法を小さくし過ぎれば、強度が低下する傾向があり、溝間寸法を大きくし過ぎれば、不陸追従性が低下する傾向がある。 The groove width dimension of the plurality of grooves 18 and the dimension between the adjacent grooves 18 and 18 (inter-groove dimension) are from the viewpoint of the workability of each groove 18 and the strength of the floor material 1, and the step (non-landing). Appropriate dimensions may be used from the viewpoint of followability and the like. For example, the groove width dimension of each groove 18 may be about 1 mm to 5 mm, preferably about 1 mm to 3 mm. If the groove width dimension is too small, the workability and non-land followability tend to decrease, and if the groove width dimension is too large, the strength tends to decrease. Further, the inter-groove dimension may be about 5 mm to 20 mm, preferably about 5 mm to 15 mm. If the inter-groove size is too small, the strength tends to decrease, and if the inter-groove size is too large, the non-land followability tends to decrease.

また、各溝１８の溝深さ寸法は、合板基材層１０の厚さに応じて、また、上記と概ね同様、床材１の強度上の観点や段差（不陸）追従性の観点等から適宜の寸法としてもよい。合板基材層１０の厚さに対して溝深さ寸法を小さくし過ぎれば、不陸追従性が低下する傾向があり、合板基材層１０の厚さに対して溝深さ寸法を大きくし過ぎれば、強度が低下する傾向がある。また、これら複数本の溝１８が設けられた部位の第２単板１２の溝底側の残り厚さｔ２は、床材１の強度上の観点や反りを抑制する観点から、また、第１単板１１の厚さｔ１に応じて、適宜の寸法としてもよい。第２単板１２の溝底側の残り厚さｔ２が第１単板１１の厚さｔ１の１／１０〜１２／１０（好ましくは、２／１０〜９／１０）程度となるように複数本の溝１８を設けた構成としてもよい。本実施形態では、これら複数本の溝１８を、第２単板１２の溝底側の残り厚さｔ２が第１単板１１の厚さｔ１の５／１０〜７／１０となるように設けた構成としている。図例では、第２単板１２の溝底側の残り厚さｔ２を、第１単板１１の厚さｔ１の７／１０とした例を示している。この第２単板１２の溝底側の残り厚さｔ２は、不陸追従性の観点や強度上の観点、反りを抑制する観点等から、適宜の寸法としてもよく、例えば、０．１ｍｍ〜２．０ｍｍ程度としてもよく、０．２ｍｍ〜１．２ｍｍ程度としてもよい。 Further, the groove depth dimension of each groove 18 depends on the thickness of the plywood base material layer 10, and is substantially the same as the above, from the viewpoint of the strength of the floor material 1, the viewpoint of step (non-landing) followability, and the like. Therefore, the dimensions may be appropriate. If the groove depth dimension is made too small with respect to the thickness of the plywood base material layer 10, the non-land followability tends to decrease, and the groove depth dimension is increased with respect to the thickness of the plywood base material layer 10. If it is too much, the strength tends to decrease. Further, the remaining thickness t2 on the groove bottom side of the second veneer 12 at the portion where the plurality of grooves 18 are provided is the first from the viewpoint of strength of the floor material 1 and from the viewpoint of suppressing warpage. Depending on the thickness t1 of the veneer 11, the dimensions may be appropriate. A plurality of remaining thickness t2 on the groove bottom side of the second veneer 12 is about 1/10 to 12/10 (preferably 2/10 to 9/10) of the thickness t1 of the first veneer 11. The groove 18 of the book may be provided. In the present embodiment, these plurality of grooves 18 are provided so that the remaining thickness t2 on the groove bottom side of the second veneer 12 is 5/10 to 7/10 of the thickness t1 of the first veneer 11. It has a structure. In the illustrated example, the remaining thickness t2 on the groove bottom side of the second veneer 12 is set to 7/10 of the thickness t1 of the first veneer 11. The remaining thickness t2 on the groove bottom side of the second veneer 12 may have an appropriate dimension from the viewpoint of non-land followability, strength, warpage, etc., for example, from 0.1 mm to 0.1 mm. It may be about 2.0 mm, or about 0.2 mm to 1.2 mm.

なお、図例では、床材長手方向一端側の最も雄実部３側に位置する溝１８から雄実部３の突出方向先端までの床材長手方向に沿う寸法を、溝間寸法と同程度とした例を示している。また、床材長手方向他端側の最も雌実部４側に位置する溝１８から雌実部４の開口縁部側となる床材長手方向他端面までの床材長手方向に沿う寸法を、溝間寸法と同程度とした例を示している。このような態様に代えて、これら床材長手方向両端側の各溝１８，１８を、図例よりも床材長手方向外方側や中央側に位置するように設けた態様としてもよい。
また、これら複数本の溝１８は、適宜の切削工具を用いて切削加工等によって形成されたものとしてもよい。
また、合板基材層１０に、床材長手方向の全体に亘って延びるように裏面側において開口する複数本の溝（縦溝）を床材幅方向に間隔（等間隔）を空けて設けた構成としてもよい。この場合は、これら縦溝の溝深さ寸法を、上記した床材幅方向に延びる各溝１８の溝深さ寸法よりも小さくしてもよい。 In the illustrated example, the dimension along the floor material longitudinal direction from the groove 18 located on the most male part 3 side on one end side in the floor material longitudinal direction to the tip of the male part 3 in the protruding direction is about the same as the inter-groove dimension. An example is shown. Further, the dimension along the longitudinal direction of the floor material from the groove 18 located on the other end side in the longitudinal direction of the floor material to the other end surface in the longitudinal direction of the floor material, which is the opening edge side of the female body portion 4, is determined. An example is shown in which the dimensions are the same as those between the grooves. Instead of such a mode, the grooves 18 and 18 on both ends in the longitudinal direction of the floor material may be provided so as to be located on the outer side or the center side in the longitudinal direction of the floor material as compared with the illustration.
Further, these plurality of grooves 18 may be formed by cutting or the like using an appropriate cutting tool.
Further, the plywood base material layer 10 is provided with a plurality of grooves (vertical grooves) opened on the back surface side so as to extend over the entire length direction of the floor material at intervals (equal intervals) in the width direction of the floor material. It may be configured. In this case, the groove depth dimension of these vertical grooves may be smaller than the groove depth dimension of each groove 18 extending in the floor material width direction described above.

表面化粧層２０は、合板基材層１０の表面側に積層一体化されており、防湿層２２を含んだ構成とされている。
本実施形態では、表面化粧層２０を、防湿層２２の表面側に表面化粧材２１を積層した構成としている。
表面化粧材２１としては、天然木材（銘木）から形成された突板等の単板（化粧単板）や、木目柄等の種々の柄（模様）が印刷された化粧印刷紙やオレフィン系等の合成樹脂系の樹脂シート（フィルム）等としてもよい。この表面化粧材２１の厚さは、例えば、０．０１ｍｍ〜１．０ｍｍ程度としてもよく、０．０５ｍｍ〜０．５ｍｍ程度としてもよい。 The surface decorative layer 20 is laminated and integrated on the surface side of the plywood base material layer 10, and is configured to include the moisture-proof layer 22.
In the present embodiment, the surface decorative layer 20 is configured by laminating the surface decorative material 21 on the surface side of the moisture-proof layer 22.
The surface decorative material 21 includes a single plate (decorative single plate) such as a veneer formed from natural wood (named wood), a decorative printing paper on which various patterns (patterns) such as a wood grain pattern are printed, an olefin type, and the like. It may be a synthetic resin-based resin sheet (film) or the like. The thickness of the surface decorative material 21 may be, for example, about 0.01 mm to 1.0 mm or about 0.05 mm to 0.5 mm.

防湿層２２は、薄シート状（フィルム状）とされたものとしてもよい。この防湿層２２としては、ポリエチレン、ポリプロピレン、ポリ塩化ビニル、ポリエチレンテレフタレート等の合成樹脂系の樹脂シート（フィルム）としてもよく、また、アルミ箔等の金属薄膜シートやアスファルトシート等としてもよい。また、この防湿層２２としては、透湿度（水蒸気透過度）が比較的に小さいものとしてもよい。また、防湿層２２の厚さは、例えば、０．０２ｍｍ〜１．０ｍｍ程度としてもよく、０．０５ｍｍ〜０．５ｍｍ程度としてもよい。なお、表面化粧層２０としては、表面化粧材２１と防湿層２２とを備えた複層構造とされたものに限られず、防湿性を有した表面化粧材２１を表面化粧層２０としてもよい。つまりは、表面化粧材２１自体が防湿層として機能するものとしてもよい。また、表面化粧層２０としては、上記のような表面化粧材２１を設けた態様に代えて、または加えて、印刷層や透明（クリアー）保護膜などの塗膜層を含んだ構成としてもよい。 The moisture-proof layer 22 may be in the form of a thin sheet (film). The moisture-proof layer 22 may be a synthetic resin-based resin sheet (film) such as polyethylene, polypropylene, polyvinyl chloride, or polyethylene terephthalate, or a metal thin film sheet such as aluminum foil, an asphalt sheet, or the like. Further, the moisture-proof layer 22 may have a relatively small moisture permeability (water vapor permeability). The thickness of the moisture-proof layer 22 may be, for example, about 0.02 mm to 1.0 mm or about 0.05 mm to 0.5 mm. The surface decorative layer 20 is not limited to a multi-layer structure including the surface decorative material 21 and the moisture-proof layer 22, and the surface decorative material 21 having moisture-proof property may be used as the surface decorative layer 20. That is, the surface decorative material 21 itself may function as a moisture-proof layer. Further, the surface decorative layer 20 may be configured to include a coating film layer such as a printing layer or a transparent (clear) protective film in place of or in addition to the mode in which the surface decorative material 21 is provided as described above. ..

また、合板基材層１０の裏面には、上記した当該床材１の長手方向に間隔を空けた部位同士の床材厚さ方向への変位に追従可能な裏面層２３が設けられている。本実施形態では、この裏面層２３を、合板基材層１０の裏面に貼着された裏面シート２３としている。この裏面シート２３としては、複数本の溝１８の裏面側開口を塞ぐように合板基材層１０の裏面に貼着され、合板基材層１０への裏面側からの吸湿を抑制し得るものでもよい。例えば、裏面シート２３としては、上記同様なオレフィン系樹脂やその他の樹脂等の合成樹脂系の樹脂シート（フィルム）としてもよく、紙シートやゴムシート等としてもよい。また、この裏面シート２３を、厚さが０．５ｍｍ以下の樹脂シートとしてもよい。この裏面シート２３の厚さを、例えば、０．０１ｍｍ〜０．５ｍｍ程度としてもよく、０．１ｍｍ〜０．３ｍｍ程度としてもよい。また、このような吸湿を抑制する裏面シート２３は、合板基材層１０の裏面（雄実部の部位を除く裏面）の略全面に亘って貼着されたものでもよいが、合板基材層１０の裏面の７０％以上、好ましくは８０％以上を覆うように貼着されたものでもよい。 Further, on the back surface of the plywood base material layer 10, a back surface layer 23 capable of following the displacement of the above-mentioned floor material 1 between the portions spaced in the longitudinal direction in the floor material thickness direction is provided. In the present embodiment, the back surface layer 23 is a back surface sheet 23 attached to the back surface of the plywood base material layer 10. The back surface sheet 23 may be attached to the back surface of the plywood base material layer 10 so as to close the back surface side openings of the plurality of grooves 18 and can suppress moisture absorption from the back surface side to the plywood base material layer 10. Good. For example, the back sheet 23 may be a synthetic resin-based resin sheet (film) such as the same olefin-based resin or other resin as described above, or may be a paper sheet, a rubber sheet, or the like. Further, the back surface sheet 23 may be a resin sheet having a thickness of 0.5 mm or less. The thickness of the back sheet 23 may be, for example, about 0.01 mm to 0.5 mm or about 0.1 mm to 0.3 mm. Further, the back surface sheet 23 that suppresses such moisture absorption may be attached over substantially the entire back surface of the plywood base material layer 10 (the back surface excluding the male part), but the plywood base material layer. It may be attached so as to cover 70% or more, preferably 80% or more of the back surface of 10.

また、このような裏面シート２３としては、合板基材層１０への裏面側からの吸湿を抑制し得る機能に代えて、または加えて、複数本の溝１８の裏面側開口を拡開させる側への合板基材層１０の反り（凹反り）を拘束するように抑制し得る機能を有したものとしてもよい。つまり、床材幅方向に見て床材長手方向中央部側が凹むような凹反りを物理的に拘束するように抑制し得る裏面シート２３を合板基材層１０の裏面に貼着した構成としてもよい。このような裏面シート２３は、上記同様、複数本の溝１８の裏面側開口を塞ぐように合板基材層１０の裏面の略全面に亘って貼着されたものでもよいが、合板基材層１０の裏面に略全長に亘って貼着された細幅状とされたものでもよい。この場合は、複数枚の裏面シート２３を、合板基材層１０の裏面に幅方向に間隔を空けて貼着した構成等としてもよい。 Further, such a back surface sheet 23 is a side that expands the back surface side openings of the plurality of grooves 18 in place of or in addition to the function of suppressing moisture absorption from the back surface side to the plywood base material layer 10. The plywood base material layer 10 may have a function of restraining the warp (concave warp) of the plywood base material layer 10. That is, even if the back surface sheet 23 that can physically restrain the concave warp such that the central portion side in the longitudinal direction of the floor material is dented when viewed in the width direction of the floor material is attached to the back surface of the plywood base material layer 10. Good. Similar to the above, such a back surface sheet 23 may be attached over substantially the entire back surface of the plywood base material layer 10 so as to close the back side openings of the plurality of grooves 18, but the plywood base material layer may be attached. It may be a narrow width shape attached to the back surface of the 10 over a substantially total length. In this case, a plurality of back surface sheets 23 may be attached to the back surface of the plywood base material layer 10 at intervals in the width direction.

また、上記のような拘束によって凹反りを抑制する裏面シート２３としては、ガラス繊維や炭素繊維、鉱物繊維等の強化繊維の織布や不織布、マット等の強化繊維シートが例示される。また、裏面シート２３としては、ガラス繊維シートとしてもよく、例えば、シート化されたガラス繊維にエポキシ樹脂やアクリル樹脂等の接着剤を塗布して形成されたたガラス繊維不織布（ガラスペーパー）としてもよい。また、裏面シート２３としては、ガラス繊維等の強化繊維に、パルプ等の紙原料をすき合わせたものでもよい。また、裏面シート２３としては、このような強化繊維シートに樹脂を含浸させた強化繊維樹脂シート等の強化繊維混合シートとしてもよい。また、裏面シート２３を、このような強化繊維シートや強化繊維混合シートとした場合には、厚さを０．１ｍｍ以上１．０ｍｍ以下としてもよく、好ましくは０．８ｍｍ以下としてもよく、０．３ｍｍ〜０．５ｍｍ程度としてもよい。また、裏面シート２３としては、このような強化繊維シートに、上記のような紙シートや樹脂シート等を積層した複層構造とされたものでもよい。また、上記のような種々の裏面シート２３と合板基材層１０とは、適宜の接着剤を介して積層一体化されたものでもよいが、裏面シート２３に設けられた粘着層を介して積層一体化されたものでもよい。このような粘着層を有した裏面シート２３としては、ＰＰ（ポリプロピレン）テープやＰＥ（ポリエチレン）テープ等の樹脂系粘着テープとしてもよい。また、合板基材層１０の裏面に設けられる裏面層２３としては、合板基材層１０の裏面に貼着される裏面シート２３に限られない。例えば、裏面層２３としては、硬化後にシート状（薄板状）となるホットメルト系接着剤等の接着剤が合板基材層１０の裏面に塗布されて形成された接着剤硬化層でもよい。 Further, as the back surface sheet 23 that suppresses the concave warp by the above-mentioned restraint, a woven fabric of reinforcing fibers such as glass fiber, carbon fiber, and mineral fiber, a non-woven fabric, and a reinforcing fiber sheet such as a mat are exemplified. Further, the back surface sheet 23 may be a glass fiber sheet, for example, a glass fiber non-woven fabric (glass paper) formed by applying an adhesive such as an epoxy resin or an acrylic resin to the sheeted glass fiber. Good. Further, the back sheet 23 may be made by combining reinforcing fibers such as glass fibers with a paper raw material such as pulp. Further, the back surface sheet 23 may be a reinforcing fiber mixed sheet such as a reinforcing fiber resin sheet in which such a reinforcing fiber sheet is impregnated with a resin. Further, when the back surface sheet 23 is such a reinforcing fiber sheet or a reinforcing fiber mixed sheet, the thickness may be 0.1 mm or more and 1.0 mm or less, preferably 0.8 mm or less, and 0. It may be about 3 mm to 0.5 mm. Further, the back surface sheet 23 may have a multi-layer structure in which the above-mentioned paper sheet, resin sheet, or the like is laminated on such a reinforcing fiber sheet. Further, the various back surface sheets 23 and the plywood base material layer 10 as described above may be laminated and integrated via an appropriate adhesive, but are laminated via an adhesive layer provided on the back surface sheet 23. It may be integrated. The back sheet 23 having such an adhesive layer may be a resin-based adhesive tape such as PP (polypropylene) tape or PE (polyethylene) tape. Further, the back surface layer 23 provided on the back surface of the plywood base material layer 10 is not limited to the back surface sheet 23 attached to the back surface of the plywood base material layer 10. For example, the back surface layer 23 may be an adhesive cured layer formed by applying an adhesive such as a hot melt adhesive that becomes a sheet (thin plate) after curing to the back surface of the plywood base material layer 10.

本実施形態に係る床材１は、上述のような構成としたことで、段差やがたつきの発生を抑制可能でありながらも、反りを抑制することができる。
つまり、合板基材層１０の裏面側に、上記のように複数本の溝１８を設けた構成としている。従って、床下地２に段差や不陸があるような場合にも、当該床材１が追従するように変形し、隣り合う床材１同士に段差が生じたり、踏んだ際にがたつきが生じたりすることを抑制することができる。また、荷重によって床下地２が沈み込む傾向がある上記のようなフリーアクセスフロア（ＯＡフロア）の床仕上材として好適なものとなる。つまり、隣り合う下地パネルを跨ぐように床材１を施工した場合において、一方の下地パネルが荷重によって沈み込んだ場合にも、他方の下地パネル上に配された床材１の部位が浮き上がる（跳ね上がる）ようなことを抑制することができる。これにより、止具や接着剤等を用いることなく床下地２上にいわゆる置敷床的に施工されるものとしても好適なものとなる。 By adopting the floor material 1 according to the present embodiment as described above, it is possible to suppress the occurrence of steps and rattling, but also to suppress the warp.
That is, a plurality of grooves 18 are provided on the back surface side of the plywood base material layer 10 as described above. Therefore, even if there is a step or unevenness on the floor base 2, the floor material 1 is deformed to follow the floor material 1, and a step is generated between adjacent floor materials 1 or rattling occurs when the floor material 1 is stepped on. It is possible to suppress the occurrence. Further, it is suitable as a floor finishing material for a free access floor (OA floor) as described above, in which the floor base 2 tends to sink due to a load. That is, when the floor material 1 is constructed so as to straddle the adjacent base panels, even if one base panel is sunk by a load, the portion of the floor material 1 arranged on the other base panel is lifted ( It is possible to suppress such things as jumping up. This makes it suitable as a so-called laying floor on the floor base 2 without using fasteners, adhesives, or the like.

また、上記のように変形可能でありながらも、合板基材層１０における床材長手方向に繊維方向を沿わせた最表層の第１単板１１及び一部に溝１８が形成された第２単板１２によって床材１自体の破損等を抑制することができる。
また、合板基材層１０の裏面に、上記のような床材１の変位に追従可能で、かつ合板基材層１０への裏面側からの吸湿を抑制し得る裏面シート（裏面層）２３を複数本の溝１８の裏面側開口を塞ぐように設けた構成とすれば、吸湿による反りを抑制することができる。つまり、段差や不陸に追従するように変形可能でありながらも、裏面シート２３によって合板基材層１０の吸湿を抑制することができ、吸湿による反りを抑制することができる。
また、合板基材層１０の裏面に、床材１の変位に追従可能で、かつ複数本の溝１８の裏面側開口を拡開させる側への合板基材層１０の反り（凹反り）を拘束するように抑制し得る裏面シート（裏面層）２３を設けた構成としても、概ね同様の効果を奏する。つまり、吸湿自体を抑制する態様に代えて、吸湿によって凹反りしようとする合板基材層１０の変形を物理的に拘束するようにして抑制することができる。
また、表面化粧層２０を、防湿層２２を含んだ構成としている。従って、表面側からの吸湿を抑制することができ、後記するように、日光照射状態に近似させた投光負荷に起因する反りを抑制することができる。 Further, although it is deformable as described above, the first veneer 11 of the outermost layer in which the fiber direction is aligned with the longitudinal direction of the floor material in the plywood base material layer 10 and the second groove 18 are formed in a part thereof. The veneer 12 can prevent damage to the floor material 1 itself.
Further, on the back surface of the plywood base material layer 10, a back surface sheet (back surface layer) 23 capable of following the displacement of the floor material 1 as described above and suppressing moisture absorption from the back surface side to the plywood base material layer 10 is provided. If the configuration is provided so as to close the openings on the back surface side of the plurality of grooves 18, warpage due to moisture absorption can be suppressed. That is, the back sheet 23 can suppress the moisture absorption of the plywood base material layer 10 and suppress the warp due to the moisture absorption, although it can be deformed so as to follow the step and the non-landing.
Further, on the back surface of the plywood base material layer 10, the plywood base material layer 10 is warped (concave warp) toward the side where the displacement of the floor material 1 can be followed and the back side openings of the plurality of grooves 18 are widened. Even if the back surface sheet (back surface layer) 23 that can be restrained so as to be restrained is provided, substantially the same effect can be obtained. That is, instead of suppressing the moisture absorption itself, the deformation of the plywood base material layer 10 that tends to warp due to the moisture absorption can be suppressed by physically restraining it.
Further, the surface decorative layer 20 is configured to include a moisture-proof layer 22. Therefore, it is possible to suppress moisture absorption from the surface side, and as will be described later, it is possible to suppress warpage caused by a light projection load approximated to a sunlight irradiation state.

また、本実施形態では、複数本の溝１８を、第２単板１２の溝底側の残り厚さｔ２が第１単板１１の厚さｔ１の５／１０〜７／１０となるように設けた構成としている。従って、合板基材層１０における最表層となる第１単板１１の厚さｔ１に対して、第２単板１２の溝１８が形成された部位の溝底側の残り厚さｔ２が適度の厚さとなり、後記するように、低湿状態（平常状態（常態）や乾燥負荷状態）における反りを抑制することができる。つまり、第１単板１１の厚さｔ１に対して第２単板１２の溝底側の残り厚さｔ２を小さくし過ぎれば、第１単板１１の影響が大となり、床材幅方向に見て床材長手方向中央部側が凹むように凹反りし易くなる傾向がある。一方、第１単板１１の厚さｔ１に対して第２単板１２の溝底側の残り厚さｔ２を大きくし過ぎれば、第２単板１２の影響が大となり、床材幅方向に見て床材長手方向中央部側が突出するように凸反りし易くなる傾向がある。上記構成とすれば、このような反りを抑制することができる。 Further, in the present embodiment, the plurality of grooves 18 are provided so that the remaining thickness t2 on the groove bottom side of the second veneer 12 is 5/10 to 7/10 of the thickness t1 of the first veneer 11. It has a provided configuration. Therefore, the remaining thickness t2 on the groove bottom side of the portion where the groove 18 of the second veneer 12 is formed is appropriate with respect to the thickness t1 of the first veneer 11 which is the outermost layer of the plywood base material layer 10. The thickness is increased, and as will be described later, warpage in a low humidity state (normal state (normal state) or dry load state) can be suppressed. That is, if the remaining thickness t2 on the groove bottom side of the second veneer 12 is made too small with respect to the thickness t1 of the first veneer 11, the influence of the first veneer 11 becomes large and the floor material width direction As seen, there is a tendency for the floor material to be easily warped so that the central portion in the longitudinal direction is dented. On the other hand, if the remaining thickness t2 on the groove bottom side of the second veneer 12 is made too large with respect to the thickness t1 of the first veneer 11, the influence of the second veneer 12 becomes large and the floor material width direction As seen, there is a tendency for the floor material to be prone to warp so that the central portion in the longitudinal direction protrudes. With the above configuration, such warpage can be suppressed.

また、裏面シート２３を、厚さが０．５ｍｍ以下の樹脂シートとすれば、床材１の薄型化を図りながらも、段差や不陸に対する追従性を効果的に向上させ、吸湿による反りを効果的に抑制することができる。また、床材１の薄型化を図ることができるので、フリーアクセスフロア（ＯＡフロア）の床仕上材としても好適なものとなる。
また、裏面シート２３を、厚さが１．０ｍｍ以下のガラス繊維含有シートとした場合にも概ね同様の効果を奏する。また、吸湿によって凹反りしようとする合板基材層１０の変形を、より効果的に物理的に拘束するようにして抑制することができる。 Further, if the back surface sheet 23 is a resin sheet having a thickness of 0.5 mm or less, the floor material 1 can be made thinner, and the followability to steps and unevenness can be effectively improved to prevent warpage due to moisture absorption. It can be effectively suppressed. Further, since the floor material 1 can be made thinner, it is also suitable as a floor finishing material for a free access floor (OA floor).
Further, when the back surface sheet 23 is a glass fiber-containing sheet having a thickness of 1.0 mm or less, substantially the same effect is obtained. In addition, the deformation of the plywood base material layer 10 that tends to warp due to moisture absorption can be suppressed by physically restraining it more effectively.

次に、本発明に係る他の実施形態について、図面を参照しながら説明する。
図１（ｂ）は、第２実施形態に係る床材の一例を模式的に示す図である。
なお、上記第１実施形態との相違点について主に説明し、同様の構成については、同一の符号を付し、その説明を省略または簡略に説明する。 Next, another embodiment according to the present invention will be described with reference to the drawings.
FIG. 1B is a diagram schematically showing an example of a floor material according to the second embodiment.
The differences from the first embodiment will be mainly described, and the same configurations will be designated by the same reference numerals, and the description thereof will be omitted or briefly described.

本実施形態に係る床材１Ａは、図１（ｂ）に示すように、合板基材層１０Ａの複数本の溝１８Ａの構成が、上記第１実施形態とは主に異なる。本実施形態では、上記同様の層構成とされた合板基材層１０Ａに設けられた複数本の溝１８Ａの溝深さ寸法を、上記第１実施形態よりも小としている。つまり、第２単板１２の溝底側の残り厚さｔ２Ａを、上記第１実施形態の第２単板１２の溝底側の残り厚さｔ２よりも大としている。図例では、第２単板１２の溝底側の残り厚さｔ２Ａを、第１単板１１の厚さｔ１の１２／１０とした構成としている。このような構成とすれば、上記第１実施形態と比べて、低湿状態において僅かに凸反りし易くなる傾向があるものの、上記した第１実施形態と概ね同様の効果を奏する。 As shown in FIG. 1B, the floor material 1A according to the present embodiment is mainly different from the first embodiment in the configuration of the plurality of grooves 18A of the plywood base material layer 10A. In the present embodiment, the groove depth dimension of the plurality of grooves 18A provided in the plywood base material layer 10A having the same layer structure as described above is smaller than that of the first embodiment. That is, the remaining thickness t2A on the groove bottom side of the second veneer 12 is made larger than the remaining thickness t2 on the groove bottom side of the second veneer 12 of the first embodiment. In the illustrated example, the remaining thickness t2A on the groove bottom side of the second veneer 12 is set to 12/10 of the thickness t1 of the first veneer 11. With such a configuration, as compared with the first embodiment, the warp tends to be slightly more likely to occur in a low humidity state, but the same effect as that of the first embodiment is obtained.

次に、本発明に係る更に他の実施形態について、図面を参照しながら説明する。
図１（ｃ）は、第３実施形態に係る床材の一例を模式的に示す図である。
なお、上記各実施形態との相違点について主に説明し、同様の構成については、同一の符号を付し、その説明を省略または簡略に説明する。 Next, still another embodiment according to the present invention will be described with reference to the drawings.
FIG. 1C is a diagram schematically showing an example of a floor material according to a third embodiment.
The differences from the above embodiments will be mainly described, and the same configurations will be designated by the same reference numerals, and the description thereof will be omitted or briefly described.

本実施形態に係る床材１Ｂは、図１（ｃ）に示すように、合板基材層１０Ｂの複数本の溝１８Ｂの構成が、上記第１実施形態とは主に異なる。本実施形態では、上記同様の層構成とされた合板基材層１０Ｂに設けられた複数本の溝１８Ｂの溝深さ寸法を、上記第１実施形態よりも大としている。つまり、第２単板１２の溝底側の残り厚さｔ２Ｂを、上記第１実施形態の第２単板１２の溝底側の残り厚さｔ２よりも小としている。図例では、第２単板１２の溝底側の残り厚さｔ２Ｂを、第１単板１１の厚さｔ１の２／１０とした構成としている。このような構成とすれば、上記第１実施形態と比べて、低湿状態において僅かに凹反りし易くなる傾向があるものの、上記した第１実施形態と概ね同様の効果を奏する。 As shown in FIG. 1C, the floor material 1B according to the present embodiment mainly differs from the first embodiment in the configuration of the plurality of grooves 18B of the plywood base material layer 10B. In the present embodiment, the groove depth dimension of the plurality of grooves 18B provided in the plywood base material layer 10B having the same layer structure as described above is made larger than that of the first embodiment. That is, the remaining thickness t2B on the groove bottom side of the second veneer 12 is smaller than the remaining thickness t2 on the groove bottom side of the second veneer 12 of the first embodiment. In the illustrated example, the remaining thickness t2B on the groove bottom side of the second veneer 12 is set to 2/10 of the thickness t1 of the first veneer 11. With such a configuration, as compared with the first embodiment, the warp tends to be slightly more likely to occur in a low humidity state, but the same effect as that of the first embodiment is obtained.

次に、本発明に係る更に他の実施形態について、図面を参照しながら説明する。
図１（ｄ）は、第４実施形態に係る床材の一例を模式的に示す図である。
なお、上記各実施形態との相違点について主に説明し、同様の構成については、同一の符号を付し、その説明を省略または簡略に説明する。 Next, still another embodiment according to the present invention will be described with reference to the drawings.
FIG. 1D is a diagram schematically showing an example of a floor material according to a fourth embodiment.
The differences from the above embodiments will be mainly described, and the same configurations will be designated by the same reference numerals, and the description thereof will be omitted or briefly described.

本実施形態に係る床材１Ｃは、図１（ｄ）に示すように、合板基材層１０Ｃの構成が、上記各実施形態とは主に異なる。
本実施形態では、合板基材層１０Ｃを、７枚の単板１１Ａ，１２Ａ，１３Ａ，１４Ａ，１５Ａ，１６Ａ，１７Ａを積層したいわゆる７プライ合板としている。つまり、本実施形態では、合板基材層１０Ｃは、第１単板１１Ａ、第２単板１２Ａ、第３単板１３Ａ、第４単板１４Ａ、第５単板１５Ａ、第６単板１６Ａ及び第７単板１７Ａを表面側からこの順に積層した構成とされている。また、第１単板１１Ａ、第３単板１３Ａ、第５単板１５Ａ及び第７単板１７Ａが床材長手方向に繊維方向を沿わせた奇数層の単板を構成し、第２単板１２Ａ、第４単板１４Ａ及び第６単板１６Ａが床材幅方向に繊維方向を沿わせた偶数層の単板を構成する。 As shown in FIG. 1D, the floor material 1C according to the present embodiment is mainly different from each of the above-described embodiments in the structure of the plywood base material layer 10C.
In the present embodiment, the plywood base material layer 10C is a so-called 7-ply plywood in which seven veneers 11A, 12A, 13A, 14A, 15A, 16A, and 17A are laminated. That is, in the present embodiment, the plywood base material layer 10C includes the first veneer 11A, the second veneer 12A, the third veneer 13A, the fourth veneer 14A, the fifth veneer 15A, the sixth veneer 16A, and the like. The seventh veneer 17A is laminated in this order from the surface side. Further, the first veneer 11A, the third veneer 13A, the fifth veneer 15A and the seventh veneer 17A form an odd-layered veneer in which the fiber direction is aligned in the longitudinal direction of the floor material, and the second veneer is formed. 12A, 4th veneer 14A and 6th veneer 16A form an even layer veneer in which the fiber direction is aligned with the floor material width direction.

また、本実施形態では、合板基材層１０Ｃの厚さを、上記各実施形態と同厚さとする一方、内層側の単板（第２単板１２Ａ〜第６単板１６Ａ）の厚さを、上記各実施形態よりも小としている。図例では、最表層側となる第１単板１１Ａ及び最裏層側となる第７単板１７Ａの厚さを、上記各実施形態の第１単板１１及び第５単板１５と同厚さとした例を示している。また、図例では、同厚さとされた第１単板１１Ａ及び第７単板１７Ａ以外の単板１２Ａ，１３Ａ，１４Ａ，１５Ａ，１６Ａを同厚さとし、これらの厚さを第１単板１１Ａ及び第７単板１７Ａの厚さよりも大としている。
また、本実施形態では、複数本の溝１８Ｃを、上記第１実施形態と同様、第２単板１２Ａの溝底側の残り厚さｔ２が第１単板１１Ａの厚さｔ１の７／１０となるように設けた構成としている。
上記構成とされた本実施形態に係る床材１Ｃにおいても、上記した第１実施形態と略同様の効果を奏する。 Further, in the present embodiment, the thickness of the plywood base material layer 10C is the same as that of each of the above embodiments, while the thickness of the veneer (second veneer 12A to sixth veneer 16A) on the inner layer side is set. , Smaller than each of the above embodiments. In the illustrated example, the thickness of the first veneer 11A on the outermost layer side and the thickness of the seventh veneer 17A on the backmost layer side is the same as the thickness of the first veneer 11 and the fifth veneer 15 of each of the above embodiments. An example is shown. Further, in the illustrated example, the veneers 12A, 13A, 14A, 15A, 16A other than the first veneer 11A and the seventh veneer 17A having the same thickness are made the same thickness, and these thicknesses are the first veneer 11A. And it is made larger than the thickness of the 7th veneer 17A.
Further, in the present embodiment, the remaining thickness t2 on the groove bottom side of the second veneer 12A is 7/10 of the thickness t1 of the first veneer 11A in the plurality of grooves 18C as in the first embodiment. The configuration is provided so as to be.
The floor material 1C according to the present embodiment having the above configuration also has substantially the same effect as that of the first embodiment described above.

次に、本発明に係る更に他の実施形態について、図面を参照しながら説明する。
図２（ａ）は、第５実施形態に係る床材の一例を模式的に示す図である。
なお、上記各実施形態との相違点について主に説明し、同様の構成については、同一の符号を付し、その説明を省略または簡略に説明する。 Next, still another embodiment according to the present invention will be described with reference to the drawings.
FIG. 2A is a diagram schematically showing an example of the floor material according to the fifth embodiment.
The differences from the above embodiments will be mainly described, and the same configurations will be designated by the same reference numerals, and the description thereof will be omitted or briefly described.

本実施形態に係る床材１Ｄは、図２（ａ）に示すように、合板基材層１０Ｄ及び複数本の溝１８Ｄの構成が、上記各実施形態とは主に異なる。
また、本実施形態では、合板基材層１０Ｄの裏面側に、基材層を構成する裏面側層２４を更に積層した構成としている。つまり、合板基材層１０Ｄの裏面側と裏面シート２３との間に裏面側層２４を設けた構成としている。
裏面側層２４は、合板基材層１０Ｄの裏面側に積層一体化されており、防湿層２６を含んだ構成とされている。本実施形態では、この裏面側層２４を、上記した表面化粧層２０の表裏を反転させたような構成としている。つまり、合板基材層１０Ｄの裏面側にシート状の防湿層２６と、上記した表面化粧材２１と同様な裏層材２５と、を設けた構成としている。複数本の溝１８Ｄは、この裏面側層２４を含んで設けられている。つまり、裏面側層２４の裏層材２５が複数本の溝１８Ｄの裏面側開口両縁を構成している。なお、裏面側層２４としては、このような態様に限られず、その他、種々の変形が可能であり、さらには、このような裏面側層２４を設けないようにしてもよい。 As shown in FIG. 2A, the floor material 1D according to the present embodiment is mainly different from each of the above-described embodiments in the configurations of the plywood base material layer 10D and the plurality of grooves 18D.
Further, in the present embodiment, the back surface side layer 24 constituting the base material layer is further laminated on the back surface side of the plywood base material layer 10D. That is, the back surface side layer 24 is provided between the back surface side of the plywood base material layer 10D and the back surface sheet 23.
The back surface side layer 24 is laminated and integrated on the back surface side of the plywood base material layer 10D, and is configured to include the moisture-proof layer 26. In the present embodiment, the back surface side layer 24 is configured such that the front and back surfaces of the front surface decorative layer 20 are inverted. That is, a sheet-shaped moisture-proof layer 26 and a back layer material 25 similar to the surface decorative material 21 described above are provided on the back surface side of the plywood base material layer 10D. The plurality of grooves 18D are provided including the back surface side layer 24. That is, the back layer material 25 of the back surface side layer 24 constitutes both edges of the back surface side openings of the plurality of grooves 18D. The back surface side layer 24 is not limited to such an embodiment, and various other modifications are possible, and further, such a back surface side layer 24 may not be provided.

また、本実施形態では、合板基材層１０Ｄの厚さを、上記第１実施形態の合板基材層１０の厚さよりも小としている。また、合板基材層１０Ｄを、上記第１実施形態と概ね同様、５枚の単板１１Ｂ，１２Ｂ，１３Ｂ，１４Ｂ，１５Ｂを積層した構成としている。図例では、各単板１１Ｂ，１２Ｂ，１３Ｂ，１４Ｂ，１５Ｂの厚さを、上記第１実施形態の対応する各単板１１，１２，１３，１４，１５の厚さよりも小とした例を示している。
また、本実施形態では、複数本の溝１８Ｄを、上記第１実施形態と概ね同様、第２単板１２Ｂの溝底側の残り厚さｔ２Ｃが第１単板１１Ｂの厚さｔ１Ａの２／３（約６．７／１０）となるように設けた構成としている。
上記構成とされた本実施形態に係る床材１Ｄにおいても、上記した第１実施形態と略同様の効果を奏する。 Further, in the present embodiment, the thickness of the plywood base material layer 10D is made smaller than the thickness of the plywood base material layer 10 of the first embodiment. Further, the plywood base material layer 10D has a configuration in which five veneers 11B, 12B, 13B, 14B, and 15B are laminated in the same manner as in the first embodiment. In the illustrated example, the thickness of each veneer 11B, 12B, 13B, 14B, 15B is smaller than the thickness of the corresponding veneers 11, 12, 13, 14, 15 of the first embodiment. Shown.
Further, in the present embodiment, the remaining thickness t2C on the groove bottom side of the second veneer 12B is 2/2 of the thickness t1A of the first veneer 11B in substantially the same manner as in the first embodiment. It is configured to be 3 (about 6.7 / 10).
The floor material 1D according to the present embodiment having the above configuration also has substantially the same effect as that of the first embodiment described above.

次に、本発明に係る更に他の実施形態について、図面を参照しながら説明する。
図２（ｂ）は、第６実施形態に係る床材の一例を模式的に示す図である。
なお、上記各実施形態との相違点について主に説明し、同様の構成については、同一の符号を付し、その説明を省略または簡略に説明する。 Next, still another embodiment according to the present invention will be described with reference to the drawings.
FIG. 2B is a diagram schematically showing an example of the floor material according to the sixth embodiment.
The differences from the above embodiments will be mainly described, and the same configurations will be designated by the same reference numerals, and the description thereof will be omitted or briefly described.

本実施形態に係る床材１Ｅは、図２（ｂ）に示すように、合板基材層１０Ｅ及び複数本の溝１８Ｅの構成が、上記各実施形態とは主に異なる。
本実施形態では、合板基材層１０Ｅの厚さ及び複数本の溝１８Ｅの溝深さを、上記第５実施形態の合板基材層１０Ｄの厚さ及び溝１８Ｄの溝深さとそれぞれ同寸法としている。また、合板基材層１０Ｅを、上記第５実施形態と概ね同様、５枚の単板１１Ｃ，１２Ｃ，１３Ｃ，１４Ｃ，１５Ｃを積層した構成としている。また、第１単板１１Ｃ及び第５単板１５Ｃの厚さを、上記第５実施形態の第１単板１１Ｂ及び第５単板１５Ｂの厚さよりも大とし、第２単板１２Ｃ及び第４単板１４Ｃの厚さを、上記第５実施形態の第２単板１２Ｂ及び第４単板１４Ｂの厚さよりも小としている。また、第３単板１３Ｃの厚さを、上記第５実施形態の第３単板１３Ｂの厚さよりも大としている。
また、本実施形態では、複数本の溝１８Ｅを、第２単板１２Ｃの溝底側の残り厚さｔ２Ｄが第１単板１１Ｃの厚さｔ１Ｂの７／１３（約５．４／１０）となるように設けた構成としている。
上記構成とされた本実施形態に係る床材１Ｅにおいても、上記した第１実施形態と略同様の効果を奏する。 As shown in FIG. 2B, the floor material 1E according to the present embodiment is mainly different from each of the above-described embodiments in the configurations of the plywood base material layer 10E and the plurality of grooves 18E.
In the present embodiment, the thickness of the plywood base material layer 10E and the groove depths of the plurality of grooves 18E are set to be the same dimensions as the thickness of the plywood base material layer 10D and the groove depths of the grooves 18D of the fifth embodiment. There is. Further, the plywood base material layer 10E has a configuration in which five veneers 11C, 12C, 13C, 14C, and 15C are laminated in substantially the same manner as in the fifth embodiment. Further, the thickness of the first veneer 11C and the fifth veneer 15C is made larger than the thickness of the first veneer 11B and the fifth veneer 15B of the fifth embodiment, and the second veneer 12C and the fourth veneer 4 The thickness of the veneer 14C is smaller than the thickness of the second veneer 12B and the fourth veneer 14B of the fifth embodiment. Further, the thickness of the third veneer 13C is made larger than the thickness of the third veneer 13B of the fifth embodiment.
Further, in the present embodiment, the remaining thickness t2D on the groove bottom side of the second veneer 12C is 7/13 (about 5.4 / 10) of the thickness t1B of the first veneer 11C in the plurality of grooves 18E. The configuration is provided so as to be.
The floor material 1E according to the present embodiment having the above configuration also has substantially the same effect as that of the first embodiment described above.

次に、本発明に係る更に他の実施形態について、図面を参照しながら説明する。
図２（ｃ）は、第７実施形態に係る床材の一例を模式的に示す図である。
なお、上記各実施形態との相違点について主に説明し、同様の構成については、同一の符号を付し、その説明を省略または簡略に説明する。 Next, still another embodiment according to the present invention will be described with reference to the drawings.
FIG. 2C is a diagram schematically showing an example of the floor material according to the seventh embodiment.
The differences from the above embodiments will be mainly described, and the same configurations will be designated by the same reference numerals, and the description thereof will be omitted or briefly described.

本実施形態に係る床材１Ｆは、図２（ｃ）に示すように、合板基材層１０Ｆ及び複数本の溝１８Ｆの構成が、上記各実施形態とは主に異なる。
本実施形態では、合板基材層１０Ｆの厚さ及び複数本の溝１８Ｆの溝深さを、上記第５実施形態の合板基材層１０Ｄの厚さ及び溝１８Ｄの溝深さとそれぞれ同寸法としている。また、合板基材層１０Ｆを、上記第４実施形態と概ね同様、７枚の単板１１Ｄ，１２Ｄ，１３Ｄ，１４Ｄ，１５Ｄ，１６Ｄ，１７Ｄを積層した構成としている。図例では、第１単板１１Ｄ、第２単板１２Ｄ、第４単板１４Ｄ、第６単板１６Ｄ及び第７単板１７Ｄをそれぞれ同厚さとし、第３単板１３Ｄと第５単板１５Ｄとを同厚さとした例を示している。また、これら第３単板１３Ｄ及び第５単板１５Ｄの厚さを、これら以外の単板１１Ｄ，１２Ｄ，１４Ｄ，１６Ｄ，１７Ｄの厚さよりも大とした例を示している。
また、本実施形態では、複数本の溝１８Ｆを、上記第５実施形態と同様、第２単板１２Ｄの溝底側の残り厚さｔ２Ｃが第１単板１１Ｄの厚さｔ１Ａの２／３（約６．７／１０）となるように設けた構成としている。
上記構成とされた本実施形態に係る床材１Ｆにおいても、上記した第１実施形態と略同様の効果を奏する。 As shown in FIG. 2C, the floor material 1F according to the present embodiment is mainly different from each of the above-described embodiments in the configurations of the plywood base material layer 10F and the plurality of grooves 18F.
In the present embodiment, the thickness of the plywood base material layer 10F and the groove depths of the plurality of grooves 18F are set to be the same dimensions as the thickness of the plywood base material layer 10D and the groove depth of the grooves 18D of the fifth embodiment. There is. Further, the plywood base material layer 10F has a configuration in which seven veneers 11D, 12D, 13D, 14D, 15D, 16D, and 17D are laminated in substantially the same manner as in the fourth embodiment. In the illustrated example, the first veneer 11D, the second veneer 12D, the fourth veneer 14D, the sixth veneer 16D, and the seventh veneer 17D have the same thickness, respectively, and the third veneer 13D and the fifth veneer 15D. An example is shown in which and has the same thickness. Further, an example is shown in which the thicknesses of the third veneer 13D and the fifth veneer 15D are made larger than the thicknesses of the other veneers 11D, 12D, 14D, 16D, and 17D.
Further, in the present embodiment, the remaining thickness t2C on the groove bottom side of the second veneer 12D is 2/3 of the thickness t1A of the first veneer 11D in the plurality of grooves 18F as in the fifth embodiment. The configuration is provided so as to be (about 6.7 / 10).
The floor material 1F according to the present embodiment having the above configuration also has substantially the same effect as that of the first embodiment described above.

次に、本発明に係る更に他の実施形態について、図面を参照しながら説明する。
図２（ｄ）は、第８実施形態に係る床材の一例を模式的に示す図である。
なお、上記各実施形態との相違点について主に説明し、同様の構成については、同一の符号を付し、その説明を省略または簡略に説明する。 Next, still another embodiment according to the present invention will be described with reference to the drawings.
FIG. 2D is a diagram schematically showing an example of the floor material according to the eighth embodiment.
The differences from the above embodiments will be mainly described, and the same configurations will be designated by the same reference numerals, and the description thereof will be omitted or briefly described.

本実施形態に係る床材１Ｇは、図２（ｄ）に示すように、合板基材層１０Ｇ及び複数本の溝１８Ｇの構成が、上記各実施形態とは主に異なる。
本実施形態では、合板基材層１０Ｇの厚さ及び複数本の溝１８Ｇの溝深さを、上記第５実施形態の合板基材層１０Ｄの厚さ及び溝１８Ｄの溝深さとそれぞれ同寸法としている。また、合板基材層１０Ｇを、３枚の単板１１Ｅ，１２Ｅ，１３Ｅを積層したいわゆる３プライ合板としている。図例では、最表層側となる第１単板１１Ｅと最裏層側となる第３単板１３Ｅとを、上記同様、同厚さとし、第２単板１２Ｅの厚さを、これら第１単板１１Ｅ及び第３単板１３Ｅの厚さよりも大とした例を示している。また、第１単板１１Ｅ及び第３単板１３Ｅの厚さを、上記第６実施形態の第１単板１１Ｃ及び第５単板１５Ｃの厚さと同厚さとした例を示している。
また、本実施形態では、複数本の溝１８Ｇを、上記第６実施形態と同様、第２単板１２Ｅの溝底側の残り厚さｔ２Ｄが第１単板１１Ｅの厚さｔ１Ｂの７／１３（約５．４／１０）となるように設けた構成としている。
上記構成とされた本実施形態に係る床材１Ｇにおいても、上記した第１実施形態と略同様の効果を奏する。 As shown in FIG. 2D, the floor material 1G according to the present embodiment is mainly different from each of the above-described embodiments in the configurations of the plywood base material layer 10G and the plurality of grooves 18G.
In the present embodiment, the thickness of the plywood base material layer 10G and the groove depths of the plurality of grooves 18G are set to be the same dimensions as the thickness of the plywood base material layer 10D and the groove depths of the grooves 18D of the fifth embodiment. There is. Further, the plywood base material layer 10G is a so-called 3-ply plywood in which three veneers 11E, 12E and 13E are laminated. In the illustrated example, the first veneer 11E on the outermost layer side and the third veneer 13E on the backmost layer side have the same thickness as above, and the thickness of the second veneer 12E is the first veneer. An example is shown in which the thickness is larger than the thickness of the plate 11E and the third veneer 13E. Further, an example is shown in which the thickness of the first veneer 11E and the third veneer 13E is the same as the thickness of the first veneer 11C and the fifth veneer 15C of the sixth embodiment.
Further, in the present embodiment, as in the sixth embodiment, the remaining thickness t2D on the groove bottom side of the second veneer 12E is 7/13 of the thickness t1B of the first veneer 11E. The configuration is provided so as to be (about 5.4 / 10).
The floor material 1G according to the present embodiment having the above configuration also has substantially the same effect as that of the first embodiment described above.

なお、上記各実施形態に係る床材１，１Ａ〜１Ｇにおける互いに異なる構成を、適宜、組み替えたり、組み合わせたりして適用するようにしてもよい。また、合板基材層１０，１０Ａ〜１０Ｇとしては、３枚や５枚、７枚の単板を積層した構成とされたものに限られず、９枚以上の奇数枚の単板を積層した構成とされたものとしてもよい。 It should be noted that different configurations of the floor materials 1, 1A to 1G according to each of the above embodiments may be appropriately rearranged or combined to be applied. Further, the plywood base material layers 10, 10A to 10G are not limited to those in which three, five, and seven veneers are laminated, and nine or more odd-numbered veneers are laminated. It may be assumed that.

次に、本発明に係る床材の実施例の一例と比較例とを、図３を参照して説明する。
なお、実施例１〜実施例４及び実施例９〜実施例１２は、上記第１実施形態〜第４実施形態に係る床材１，１Ａ〜１Ｃにそれぞれ相当する実施例で、実施例５〜実施例８は、上記第５実施形態〜第８実施形態に係る床材１Ｄ〜１Ｇにそれぞれ相当する実施例である。
各実施例１〜１２及び各比較例１〜１３では、いずれも、長さ寸法が８９５ｍｍ、幅寸法が１４２ｍｍとされた床材とした。また、各床材の合板基材層の裏面側に、溝幅寸法が１．６ｍｍ程度、溝間寸法が１１．６ｍｍ程度となるように、上記したような床材幅方向に延びる複数本の溝を床材長手方向に等間隔を空けて設けた構成とした。また、実施例１〜４及び比較例１〜１３では、総厚さを９．０ｍｍとし、実施例５〜８では、総厚さを５．８ｍｍとし、実施例９〜１２では、総厚さを９．３ｍｍとした。 Next, an example of an example of the floor material according to the present invention and a comparative example will be described with reference to FIG.
In addition, Example 1 to Example 4 and Example 9 to Example 12 are examples corresponding to the floor materials 1, 1A to 1C which correspond to the said 1st Embodiment to 4th Embodiment, respectively, and Examples 5 to 5 Example 8 is an example corresponding to the floor materials 1D to 1G according to the fifth to eighth embodiments, respectively.
In each of Examples 1 to 12 and Comparative Examples 1 to 13, the floor material had a length dimension of 895 mm and a width dimension of 142 mm. Further, on the back surface side of the plywood base material layer of each floor material, a plurality of lines extending in the floor material width direction as described above so that the groove width dimension is about 1.6 mm and the groove spacing dimension is about 11.6 mm. Grooves were provided at equal intervals in the longitudinal direction of the floor material. Further, in Examples 1 to 4 and Comparative Examples 1 to 13, the total thickness was 9.0 mm, in Examples 5 to 8, the total thickness was 5.8 mm, and in Examples 9 to 12, the total thickness was set to 5.8 mm. Was 9.3 mm.

また、実施例１〜１２及び比較例１〜５では、表面化粧層として、０．２ｍｍ厚の突板（表面化粧材）と０．１ｍｍ厚のポリエチレンシート（防湿層）とを設けた構成とした。一方、比較例６〜１３では、表面化粧層として、防湿層を設けずに、０．３ｍｍ厚の突板を設けた構成とした。
また、実施例５〜８では、合板基材層の裏面側に、基材層を構成する裏面側層として、０．１ｍｍ厚のポリエチレンシートと０．２ｍｍ厚の突板とを設けた構成とし、裏面側層を含んで複数本の溝を設けた構成とした。
また、実施例１〜８、比較例１，６〜９では、裏面シート（裏面層）として、０．２ｍｍ厚のオレフィン系樹脂シート（樹脂シート）を設けた構成とした。また、実施例９〜１２では、裏面シート（裏面層）として、０．５ｍｍ厚のガラス繊維不織布（繊維シート）を設けた構成とした。一方、比較例２〜５，１０〜１３では、裏面シート（裏面層）を設けていない構成とした。 Further, in Examples 1 to 12 and Comparative Examples 1 to 5, a 0.2 mm thick veneer (surface decorative material) and a 0.1 mm thick polyethylene sheet (moisture proof layer) were provided as the surface decorative layer. .. On the other hand, in Comparative Examples 6 to 13, a veneer having a thickness of 0.3 mm was provided as the surface decorative layer without providing the moisture-proof layer.
Further, in Examples 5 to 8, a polyethylene sheet having a thickness of 0.1 mm and a veneer having a thickness of 0.2 mm are provided as a back surface side layer constituting the base material layer on the back surface side of the plywood base material layer. A plurality of grooves are provided including the back surface side layer.
Further, in Examples 1 to 8 and Comparative Examples 1 and 6 to 9, a 0.2 mm thick olefin resin sheet (resin sheet) was provided as the back surface sheet (back surface layer). Further, in Examples 9 to 12, a glass fiber non-woven fabric (fiber sheet) having a thickness of 0.5 mm was provided as the back surface sheet (back surface layer). On the other hand, in Comparative Examples 2 to 5, 10 to 13, the back surface sheet (back surface layer) was not provided.

また、実施例１〜４、実施例９〜１２及び比較例１〜１３では、８．５ｍｍ厚のラワン合板を合板基材層とし、実施例５〜８では、５．０ｍｍ厚のラワン合板を合板基材層とした。
また、実施例１〜３、実施例９〜１１及び比較例１〜１３では、合板基材層を、５枚の単板を積層した構成とし、第１単板及び第５単板の厚さを１．０ｍｍ、第２単板及び第４単板の厚さを２．５ｍｍ、第３単板の厚さを１．５ｍｍとした。実施例４及び実施例１２では、合板基材層を、７枚の単板を積層した構成とし、第１単板及び第７単板の厚さを１．０ｍｍ、それ以外の単板の厚さを１．３ｍｍとした。実施例５では、合板基材層を、５枚の単板を積層した構成とし、第１単板及び第５単板の厚さを０．６０ｍｍ、第２単板及び第４単板の厚さを１．５５ｍｍ、第３単板の厚さを０．７ｍｍとした。実施例６では、合板基材層を、５枚の単板を積層した構成とし、第１単板及び第５単板の厚さを０．６５ｍｍ、第２単板及び第４単板の厚さを１．３ｍｍ、第３単板の厚さを１．１ｍｍとした。実施例７では、合板基材層を、７枚の単板を積層した構成とし、第３単板及び第５単板の厚さを１．０ｍｍ、それ以外の単板の厚さを０．６ｍｍとした。実施例８では、合板基材層を、３枚の単板を積層した構成とし、第１単板及び第３単板の厚さを０．６５ｍｍ、第２単板の厚さを３．７ｍｍとした。 Further, in Examples 1 to 4, Examples 9 to 12 and Comparative Examples 1 to 13, 8.5 mm thick Lauan plywood was used as the plywood base material layer, and in Examples 5 to 8, 5.0 mm thick Lauan plywood was used. It was used as a plywood base material layer.
Further, in Examples 1 to 3, Examples 9 to 11 and Comparative Examples 1 to 13, the plywood base material layer has a structure in which five veneers are laminated, and the thickness of the first veneer and the fifth veneer. The thickness of the second veneer and the fourth veneer was 2.5 mm, and the thickness of the third veneer was 1.5 mm. In Examples 4 and 12, the plywood base material layer has a structure in which seven veneers are laminated, the thickness of the first veneer and the seventh veneer is 1.0 mm, and the thickness of the other veneers is 1.0 mm. The size was 1.3 mm. In the fifth embodiment, the plywood base material layer is formed by laminating five veneers, the thickness of the first veneer and the fifth veneer is 0.60 mm, and the thickness of the second veneer and the fourth veneer. The thickness was 1.55 mm, and the thickness of the third veneer was 0.7 mm. In Example 6, the plywood base material layer has a structure in which five veneers are laminated, the thickness of the first veneer and the fifth veneer is 0.65 mm, and the thickness of the second veneer and the fourth veneer. The thickness was 1.3 mm, and the thickness of the third veneer was 1.1 mm. In Example 7, the plywood base material layer has a structure in which seven veneers are laminated, the thickness of the third veneer and the fifth veneer is 1.0 mm, and the thickness of the other veneers is 0. It was set to 6 mm. In Example 8, the plywood base material layer is formed by laminating three veneers, the thickness of the first veneer and the third veneer is 0.65 mm, and the thickness of the second veneer is 3.7 mm. And said.

また、実施例１，４，９，１２及び比較例４，８，１２では、第２単板の溝底側の残り厚さが０．７ｍｍとなるように、溝深さが６．８ｍｍの複数本の溝を合板基材層に設けた構成とした。また、実施例２，１０及び比較例３，７，１１では、第２単板の溝底側の残り厚さが１．２ｍｍとなるように、溝深さが６．３ｍｍの複数本の溝を合板基材層に設けた構成とした。また、実施例３，１１及び比較例５，９，１３では、第２単板の溝底側の残り厚さが０．２ｍｍとなるように、溝深さが７．３ｍｍの複数本の溝を合板基材層に設けた構成とした。また、実施例５，７では、第２単板の溝底側の残り厚さが０．４ｍｍとなるように、溝深さが４．３ｍｍの複数本の溝を、裏面側層を含んで合板基材層（基材層）に設けた構成とした。また、実施例６，８では、第２単板の溝底側の残り厚さが０．３５ｍｍとなるように、溝深さが４．３ｍｍの複数本の溝を、裏面側層を含んで合板基材層（基材層）に設けた構成とした。また、比較例１，２，６，１０では、第３単板の溝底側の残り厚さが１．２ｍｍとなるように、溝深さが３．８ｍｍの複数本の溝を合板基材層に設けた構成とした。 Further, in Examples 1, 4, 9 and 12 and Comparative Examples 4, 8 and 12, the groove depth is 6.8 mm so that the remaining thickness on the groove bottom side of the second veneer is 0.7 mm. A plurality of grooves were provided in the plywood base material layer. Further, in Examples 2 and 10 and Comparative Examples 3, 7 and 11, a plurality of grooves having a groove depth of 6.3 mm are provided so that the remaining thickness on the groove bottom side of the second veneer is 1.2 mm. Was provided on the plywood base material layer. Further, in Examples 3 and 11 and Comparative Examples 5, 9 and 13, a plurality of grooves having a groove depth of 7.3 mm are provided so that the remaining thickness on the groove bottom side of the second veneer is 0.2 mm. Was provided on the plywood base material layer. Further, in Examples 5 and 7, a plurality of grooves having a groove depth of 4.3 mm are provided including the back surface side layer so that the remaining thickness on the groove bottom side of the second veneer is 0.4 mm. The structure was provided on the plywood base material layer (base material layer). Further, in Examples 6 and 8, a plurality of grooves having a groove depth of 4.3 mm are provided including the back surface side layer so that the remaining thickness on the groove bottom side of the second veneer is 0.35 mm. The structure was provided on the plywood base material layer (base material layer). Further, in Comparative Examples 1, 2, 6 and 10, a plurality of grooves having a groove depth of 3.8 mm were formed as a plywood base material so that the remaining thickness on the groove bottom side of the third veneer was 1.2 mm. The structure was provided in layers.

また、各実施例の床材及び各比較例の床材に対して、以下のような評価試験を行った。
＜不陸追従性評価試験＞
各実施例１〜１２及び各比較例１〜１３の床材を、２ｍｍ程度の段差が形成された床下地上に段差を跨ぐように施工し、目視観察及び床材上を歩行することで評価した。
結果は、図３に示すように、実施例１〜１２及び比較例３〜５，７〜９，１１〜１３では、段差が略目立ず、がたつきが少なく、良好な結果であった。一方、比較例１，２，６，１０では、段差が目立ち、がたつきが生じる結果となった。この結果から、合板基材層（基材層）の裏面側に、第２単板の層内に溝底が位置するように上記のような複数本の溝を設けた構成とすることで、不陸追従性に優れたものとなることが示された。 In addition, the following evaluation tests were conducted on the floor materials of each example and the floor materials of each comparative example.
<Non-land followability evaluation test>
The floor materials of Examples 1 to 12 and Comparative Examples 1 to 13 were constructed so as to straddle the floor base on which a step of about 2 mm was formed, and evaluated by visual observation and walking on the floor material. ..
As shown in FIG. 3, in Examples 1 to 12 and Comparative Examples 3 to 5, 7 to 9, 11 to 13, the steps were substantially inconspicuous, there was little rattling, and the results were good. .. On the other hand, in Comparative Examples 1, 2, 6 and 10, the step was conspicuous and rattling occurred. Based on this result, a plurality of grooves as described above are provided on the back surface side of the plywood base material layer (base material layer) so that the groove bottoms are located in the layer of the second veneer. It was shown that the non-land followability is excellent.

＜反り評価試験：常態＞
各実施例１〜１２及び各比較例１〜１３の床材を、平常状態（常態）の雰囲気に近似させた温度２５℃、湿度５０％の雰囲気下に９６時間放置し、反り量を測定した。反り量は、各実施例１〜１２及び各比較例１〜１３の床材の長手方向両端に対する長手方向中央部の厚さ方向への変位量とし、この反り量がプラスマイナス５ｍｍ以内を合格基準として判断した。
結果は、図３に示すように、実施例１〜１２及び比較例１，２，４，６，８，１０，１２では、反り量がプラスマイナス５ｍｍ以内となり、良好な結果となった。また、実施例２，１０では、他の良好なものと比べて、プラス側への反り量が大、つまり、長手方向中央部が突出する凸反りが僅かに目立つ結果となった。また、実施例３では、他の良好なものと比べて、マイナス側への反り量が大、つまり、長手方向中央部が凹む凹反りが僅かに目立つ結果となった。また、比較例３，７，１１では、プラス側への反り量が５ｍｍ超となり、比較例５，９，１３では、マイナス側への反り量が５ｍｍ超となり、反りが目立つ結果となった。 <Warp evaluation test: normal>
The flooring materials of Examples 1 to 12 and Comparative Examples 1 to 13 were left for 96 hours in an atmosphere of a temperature of 25 ° C. and a humidity of 50%, which was similar to the atmosphere of a normal state (normal state), and the amount of warpage was measured. .. The amount of warpage is the amount of displacement of the floor material of Examples 1 to 12 and Comparative Examples 1 to 13 in the thickness direction of the central portion in the longitudinal direction with respect to both ends in the longitudinal direction, and the acceptance criterion is that the amount of warpage is within plus or minus 5 mm. Judged as.
As a result, as shown in FIG. 3, in Examples 1 to 12 and Comparative Examples 1, 2, 4, 6, 8, 10, and 12, the amount of warpage was within plus or minus 5 mm, which was a good result. Further, in Examples 2 and 10, the amount of warpage toward the plus side was large as compared with other good ones, that is, the convex warp in which the central portion in the longitudinal direction protruded was slightly conspicuous. Further, in Example 3, the amount of warpage toward the minus side was large as compared with other good ones, that is, the concave warp in which the central portion in the longitudinal direction was recessed was slightly conspicuous. Further, in Comparative Examples 3, 7 and 11, the amount of warpage toward the plus side was more than 5 mm, and in Comparative Examples 5, 9 and 13, the amount of warpage toward the minus side was more than 5 mm, resulting in conspicuous warpage.

＜反り評価試験：加湿負荷＞
各実施例１〜１２及び各比較例１〜１３の床材を、温度４０℃、湿度９０％の雰囲気下に９６時間放置し、上記同様、反り量を測定した。
結果は、図３に示すように、実施例１〜１２及び比較例１，２，６〜１０では、反り量がプラスマイナス５ｍｍ以内となり、良好な結果となった。また、比較例３，４，１１，１２では、マイナス側への反り量が５ｍｍ超となり、比較例５，１３では、プラス側への反り量が５ｍｍ超となり、反りが目立つ結果となった。この結果から、裏面シート（裏面層）を設けた構成とすることで、加湿負荷に対する反りを抑制できることが示された。 <Warp evaluation test: humidification load>
The flooring materials of Examples 1 to 12 and Comparative Examples 1 to 13 were left to stand in an atmosphere of a temperature of 40 ° C. and a humidity of 90% for 96 hours, and the amount of warpage was measured in the same manner as described above.
As a result, as shown in FIG. 3, in Examples 1 to 12 and Comparative Examples 1, 2, 6 to 10, the amount of warpage was within plus or minus 5 mm, which was a good result. Further, in Comparative Examples 3, 4, 11 and 12, the amount of warpage toward the minus side was more than 5 mm, and in Comparative Examples 5 and 13, the amount of warpage toward the plus side was more than 5 mm, resulting in conspicuous warpage. From this result, it was shown that the warp against the humidifying load can be suppressed by the configuration in which the back surface sheet (back surface layer) is provided.

＜反り評価試験：乾燥負荷＞
各実施例１〜１２及び各比較例１〜１３の床材を、温度５０℃、湿度２０％の雰囲気下に９６時間放置し、上記同様、反り量を測定した。
結果は、図３に示すように、常態における反り評価試験と略同様な結果となった。つまり、実施例１〜１２及び比較例１，２，４，６，８，１０，１２では、反り量がプラスマイナス５ｍｍ以内となり、良好な結果となった。また、実施例２，１０では、他の良好なものと比べて、プラス側への反り量が大となり、実施例３では、他の良好なものと比べて、マイナス側への反り量が大となった。また、比較例３，７，１１では、プラス側への反り量が５ｍｍ超となり、比較例５，９，１３では、マイナス側への反り量が５ｍｍ超となり、反りが目立つ結果となった。この結果及び常態下の結果から、第２単板の溝底側の残り厚さを大きくし過ぎれば、第２単板の影響が大となり、凸反りし易くなる一方、第２単板の溝底側の残り厚さを小さくし過ぎれば、第１単板の影響が大となり、凹反りし易くなることが示された。 <Warness evaluation test: Drying load>
The flooring materials of Examples 1 to 12 and Comparative Examples 1 to 13 were left to stand in an atmosphere of a temperature of 50 ° C. and a humidity of 20% for 96 hours, and the amount of warpage was measured in the same manner as described above.
As shown in FIG. 3, the result was substantially the same as the warp evaluation test in the normal state. That is, in Examples 1 to 12 and Comparative Examples 1, 2, 4, 6, 8, 10, and 12, the amount of warpage was within plus or minus 5 mm, which was a good result. Further, in Examples 2 and 10, the amount of warpage toward the plus side is larger than that of other good ones, and in Example 3, the amount of warpage toward the minus side is larger than that of other good ones. It became. Further, in Comparative Examples 3, 7 and 11, the amount of warpage toward the plus side was more than 5 mm, and in Comparative Examples 5, 9 and 13, the amount of warpage toward the minus side was more than 5 mm, resulting in conspicuous warpage. From this result and the result under normal conditions, if the remaining thickness on the groove bottom side of the second veneer is made too large, the influence of the second veneer becomes large and the convex warp is likely to occur, while the groove of the second veneer It was shown that if the remaining thickness on the bottom side is made too small, the influence of the first veneer becomes large and it becomes easy to warp.

＜反り評価試験：投光負荷＞
各実施例１〜１２及び各比較例１〜１３の床材を、温度２０℃、湿度５０％の雰囲気下で、かつ各床材の表面に対して、日光照射に近似させた投光機によって１５０ｍｍの高さから照射した状態で、８時間放置し、上記同様、反り量を測定した。
結果は、図３に示すように、実施例１〜１２及び比較例１〜６，１０では、反り量がプラスマイナス５ｍｍ以内となり、良好な結果となった。また、比較例７〜９，１１〜１３では、プラス側への反り量が５ｍｍ超となり、凸反りが目立つ結果となった。特に、比較例７，１１では、プラス側への反り量が大きくなり、凸反りが大きく目立つ結果となった。この結果から、表面化粧層を、防湿層を含んだ構成とすることで、投光負荷（日光照射）に対する反りを抑制できることが示された。 <War evaluation test: floodlight load>
The flooring materials of Examples 1 to 12 and Comparative Examples 1 to 13 were subjected to an atmosphere of a temperature of 20 ° C. and a humidity of 50%, and the surface of each flooring material was subjected to a floodlight approximated to sunlight irradiation. The mixture was left to stand for 8 hours while being irradiated from a height of 150 mm, and the amount of warpage was measured in the same manner as described above.
As a result, as shown in FIG. 3, in Examples 1 to 12 and Comparative Examples 1 to 6 and 10, the amount of warpage was within plus or minus 5 mm, which was a good result. Further, in Comparative Examples 7 to 9, 11 to 13, the amount of warpage toward the plus side was more than 5 mm, and the convex warp was conspicuous. In particular, in Comparative Examples 7 and 11, the amount of warpage toward the plus side was large, and the convex warp was large and conspicuous. From this result, it was shown that the warp against the light projection load (sunlight irradiation) can be suppressed by forming the surface decorative layer with a moisture-proof layer.

以上の結果から、実施例１〜１２の各床材は、比較例１〜１３と比較して、不陸追従性に優れ、また、常態並びに加湿負荷、乾燥負荷及び投光負荷のいずれにおいても反りが抑制されることが示され、良好な結果となった。また、実施例１，４〜８，９，１１，１２の各床材は、常態及び乾燥負荷に対する反りが実施例２，３，１０よりも抑制されることが示され、特に良好な結果となった。 From the above results, each of the flooring materials of Examples 1 to 12 is superior in non-landing followability as compared with Comparative Examples 1 to 13, and is also in a normal state and in any of a humidifying load, a drying load and a flooding load. It was shown that the warp was suppressed, and good results were obtained. In addition, it was shown that the flooring materials of Examples 1, 4 to 8, 9, 11, and 12 were more suppressed in warpage with respect to the normal condition and the drying load than in Examples 2, 3, and 10, which were particularly good results. became.

１，１Ａ〜１Ｇ 床材
１０，１０Ａ〜１０Ｇ 合板基材層
１１，１１Ａ〜１１Ｅ 第１単板（奇数層の単板、一枚目の単板）
１２，１２Ａ〜１２Ｅ 第２単板（偶数層の単板、二枚目の単板）
１３，１３Ａ〜１３Ｅ 第３単板（奇数層の単板）
１４，１４Ａ〜１４Ｄ 第４単板（偶数層の単板）
１５，１５Ａ〜１５Ｄ 第５単板（奇数層の単板）
１６Ａ，１６Ｄ 第６単板（偶数層の単板）
１７Ａ，１７Ｄ 第７単板（奇数層の単板）
１８，１８Ａ〜１８Ｇ 溝
２０ 表面化粧層
２２ 防湿層
２３ 裏面シート（裏面層）
ｔ１，ｔ１Ａ，ｔ１Ｂ 第１単板の厚さ
ｔ２，ｔ２Ａ〜ｔ２Ｄ 第２単板の溝底側の残り厚さ
２ 床下地 1,1A to 1G Floor material 10,10A to 10G Plywood base material layer 11,11A to 11E First veneer (odd-numbered veneer, first veneer)
12, 12A-12E 2nd veneer (even-numbered veneer, 2nd veneer)
13, 13A to 13E 3rd veneer (odd-numbered veneer)
14, 14A-14D 4th veneer (even-numbered veneer)
15, 15A to 15D 5th veneer (odd-numbered veneer)
16A, 16D 6th veneer (even-numbered veneer)
17A, 17D 7th veneer (odd-numbered veneer)
18, 18A-18G Groove 20 Front surface decorative layer 22 Moisture-proof layer 23 Back surface sheet (back surface layer)
t1, t1A, t1B Thickness of the first veneer t2, t2A to t2D Remaining thickness of the groove bottom side of the second veneer 2 Floor base

Claims (4)

一方向に長尺状とされ、合板基材層の表面側に表面化粧層を設けた床材であって、
前記表面化粧層は、防湿層を含んだ構成とされており、
前記合板基材層は、床材長手方向に繊維方向を沿わせた奇数層の単板と床材幅方向に繊維方向を沿わせた偶数層の単板とからなる３枚以上で奇数枚の単板を積層した構成とされ、かつ、床材幅方向の全体に亘って延びるように裏面側において開口する複数本の溝が設けられた構成とされ、これら複数本の溝は、これら複数本の溝によって床材長手方向に区分される当該床材の床材長手方向に間隔を空けた部位同士が床下地の段差に追従して床材厚さ方向に相対的に変位可能なように、床材長手方向に間隔を空けて、かつ前記合板基材層の表面側から二枚目の単板の溝底側の残り厚さが該合板基材層の表面側から一枚目の単板の厚さの５／１０〜７／１０となるように溝底が前記二枚目の単板の層内に位置するように設けられており、
前記合板基材層の裏面には、前記床材厚さ方向への変位に追従可能で、かつ前記合板基材層への裏面側からの吸湿を抑制し得る、厚さが０．５ｍｍ以下の裏面シートが前記複数本の溝の裏面側開口を塞ぐように略全面に亘って貼着され、当該床材が施工された状態で、該裏面シートが前記床下地に当接されることを特徴とする床材。 A flooring material that is elongated in one direction and has a surface decorative layer on the surface side of the plywood base material layer.
The surface decorative layer is configured to include a moisture-proof layer.
The plywood base material layer is composed of three or more and an odd number of single plates having an odd layer along the fiber direction in the longitudinal direction of the floor material and an even layer single plate having the fiber direction along the width direction of the floor material. It has a structure in which single plates are laminated, and has a structure in which a plurality of grooves are provided on the back surface side so as to extend over the entire width direction of the floor material. The parts of the floor material that are separated in the longitudinal direction of the floor material are separated by the groove of the floor material so that they can be relatively displaced in the thickness direction of the floor material by following the step of the floor base. The remaining thickness of the groove bottom side of the second single plate from the surface side of the plywood base material layer is the first single plate from the surface side of the plywood base material layer at intervals in the longitudinal direction of the floor material. The groove bottom is provided so as to be located in the layer of the second single plate so as to have a thickness of 5/10 to 7/10.
The back surface of the plywood base material layer has a thickness of 0.5 mm or less, which can follow the displacement in the floor material thickness direction and can suppress the absorption of moisture from the back surface side to the plywood base material layer. It is stuck over substantially the entire surface so backsheet closes the back side opening of the plurality of grooves, in a state in which the flooring is construction, characterized in that the back sheet is Ru is contact with the subfloor Flooring material. 請求項１において、
前記裏面シートは、樹脂シートとされていることを特徴とする床材。 In claim 1,
The back surface sheet is a flooring material characterized in that it is a resin sheet. 一方向に長尺状とされ、合板基材層の表面側に表面化粧層を設けた床材であって、
前記表面化粧層は、防湿層を含んだ構成とされており、
前記合板基材層は、床材長手方向に繊維方向を沿わせた奇数層の単板と床材幅方向に繊維方向を沿わせた偶数層の単板とからなる３枚以上で奇数枚の単板を積層した構成とされ、かつ、床材幅方向の全体に亘って延びるように裏面側において開口する複数本の溝が設けられた構成とされ、これら複数本の溝は、これら複数本の溝によって床材長手方向に区分される当該床材の床材長手方向に間隔を空けた部位同士が床下地の段差に追従して床材厚さ方向に相対的に変位可能なように、床材長手方向に間隔を空けて、かつ前記合板基材層の表面側から二枚目の単板の溝底側の残り厚さが該合板基材層の表面側から一枚目の単板の厚さの５／１０〜７／１０となるように溝底が前記二枚目の単板の層内に位置するように設けられており、
前記合板基材層の裏面には、前記床材厚さ方向への変位に追従可能で、かつ前記複数本の溝の裏面側開口を拡開させる側への前記合板基材層の反りを拘束するように抑制し得る、厚さが１．０ｍｍ以下の裏面層が略全面に亘って設けられ、当該床材が施工された状態で、該裏面層が前記床下地に当接されることを特徴とする床材。 A flooring material that is elongated in one direction and has a surface decorative layer on the surface side of the plywood base material layer.
The surface decorative layer is configured to include a moisture-proof layer.
The plywood base material layer is composed of three or more and an odd number of single plates having an odd layer along the fiber direction in the longitudinal direction of the floor material and an even layer single plate having the fiber direction along the width direction of the floor material. It has a structure in which single plates are laminated, and has a structure in which a plurality of grooves are provided on the back surface side so as to extend over the entire width direction of the floor material. The parts of the floor material that are separated in the longitudinal direction of the floor material are separated by the groove of the floor material so that they can be relatively displaced in the thickness direction of the floor material by following the step of the floor base. The remaining thickness of the groove bottom side of the second single plate from the surface side of the plywood base material layer is the first single plate from the surface side of the plywood base material layer at intervals in the longitudinal direction of the floor material. The groove bottom is provided so as to be located in the layer of the second single plate so as to have a thickness of 5/10 to 7/10.
The back surface of the plywood base material layer can follow the displacement in the floor material thickness direction, and restrains the warp of the plywood base material layer toward the side where the back surface side openings of the plurality of grooves are widened. be constrained to, the backing layer is less 1.0mm thick is provided over substantially the entire surface, in a state in which the flooring is construction, that back surface layer is Ru is contact with the subfloor Characteristic flooring material. 請求項３において、
前記裏面層は、ガラス繊維含有シートとされていることを特徴とする床材。 In claim 3,
The back surface layer is a floor material characterized by being a glass fiber-containing sheet.
JP2016145867A 2016-01-12 2016-07-26 Floor material Active JP6872737B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016003778 2016-01-12
JP2016003778 2016-01-12

Publications (2)

Publication Number Publication Date
JP2017125390A JP2017125390A (en) 2017-07-20
JP6872737B2 true JP6872737B2 (en) 2021-05-19

Family

ID=59364851

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2016145867A Active JP6872737B2 (en) 2016-01-12 2016-07-26 Floor material

Country Status (1)

Country Link
JP (1) JP6872737B2 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11182006A (en) * 1997-12-18 1999-07-06 Kawai Musical Instr Mfg Co Ltd Woody floor member
JP3010352B2 (en) * 1998-07-07 2000-02-21 株式会社ノダ Floor material
JP4615091B2 (en) * 2000-05-15 2011-01-19 永大産業株式会社 Board
JP2010001688A (en) * 2008-06-23 2010-01-07 Panasonic Electric Works Co Ltd Wooden floor material and method of manufacturing wooden floor material
JP2010242484A (en) * 2008-07-22 2010-10-28 Dainippon Printing Co Ltd Decorative material for flooring
JP2015017372A (en) * 2013-07-09 2015-01-29 朝日ウッドテック株式会社 Floor material
WO2015114569A1 (en) * 2014-01-31 2015-08-06 Belink S.A. Wooden floor and floor structure

Also Published As

Publication number Publication date
JP2017125390A (en) 2017-07-20

Similar Documents

Publication Publication Date Title
NL2013046B1 (en) Panel suitable for assembling a waterproof floor or wall covering, method of producing a panel.
KR100865915B1 (en) Floor Plank
US7678466B2 (en) Flooring having surface layer of synthetic resin and wood-based board
US8647749B2 (en) Multi-ply platforms and panels using such a platform
US20150082723A1 (en) Luxury vinyl tile flooring system
EA036515B1 (en) Multilayer panel
ES2557326T3 (en) Procedure for manufacturing a panel, in particular a floor panel, and panel, in particular floor panel
JP6865372B2 (en) Flooring
EP2644478B1 (en) Plywood Panel
JP6872737B2 (en) Floor material
JP5060373B2 (en) Wood composite board
JP6878249B2 (en) Panel material and panel material manufacturing method
JP6312403B2 (en) Flooring
JP2015017372A (en) Floor material
JP2003074261A (en) Wooden fire door
ES2397261T3 (en) Procedure for the manufacture of a soundproofing panel
JP2006007713A (en) Wooden composite decorative plate and its manufacturing method
ES2757848T3 (en) Lightweight construction plate, as well as procedure and device for its manufacture
JP6497609B2 (en) Flooring
KR101261623B1 (en) Panel assembly having paper tube wound with corrugated paper strip and method thereof
JP7458837B2 (en) Finishing structure
WO2018180879A1 (en) Decorative plate
JP2007191930A (en) Fittings
JP6678329B2 (en) Flooring
KR200374931Y1 (en) The wooden floor which back groove is made by inclination

Legal Events

Date Code Title Description
RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20171002

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20190313

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20200116

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20200128

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20200325

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20200804

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20201001

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20210330

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20210406

R151 Written notification of patent or utility model registration

Ref document number: 6872737

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151