JP6497434B1 - Composite board consisting of a lined inorganic board - Google Patents
Composite board consisting of a lined inorganic board Download PDFInfo
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Abstract
【課題】 十分な曲げ強度および耐衝撃性を備えた、薄型で大型の複合板の提供。【解決手段】化粧面と裏面とを有する無機質板と、前記裏面に接着された、厚み方向に貫通している貫通孔が複数配設された金属板とを備えてなり、前記金属板は、前記貫通孔の周縁に突起を有する面が、前記裏面に接着されていることを特徴とする複合板。【選択図】 図6PROBLEM TO BE SOLVED: To provide a thin and large composite plate having sufficient bending strength and impact resistance. An inorganic plate having a decorative surface and a back surface, and a metal plate bonded to the back surface and provided with a plurality of through holes penetrating in the thickness direction, the metal plate comprising: A composite plate, wherein a surface having a protrusion on the periphery of the through hole is bonded to the back surface. [Selection] Figure 6
Description
本発明は、金属板により裏打された無機質板からなる複合板に関する。 The present invention relates to a composite plate made of an inorganic plate lined with a metal plate.
床材、内装または外装材としてタイルなどの無機質板が広く用いられている。この無機質板はある程度の強度を有するものであるが、さらにその強度を向上させるため、あるいは反り等の変形を防止するため、裏打がされることがある。 Inorganic boards such as tiles are widely used as flooring, interior or exterior materials. This inorganic plate has a certain level of strength, but may be backed to further improve its strength or to prevent deformation such as warping.
このような裏打がされた無機質板、とりわけ金属板により裏打された無機質板として、例えば、特開昭62−215759号公報(特許文献1)は、金属板を張り合わせた無機質板を開示する。ここで、金属板は穴あき板でよいとの記載がある。また、特開2009−133067号公報(特許文献2)は、多数の孔を設けた金属板を張り合わせた石質床材を開示する。無機質板と裏打材との接着には、弾性接着剤が多用されるが、床タイルを弾性接着剤で施工した場合、外部衝撃により床タイルが割れやすいことが知られている(非特許文献1を参照)。非特許文献1において、床タイルの耐衝撃性には、接着剤の材質、弾性率および伸びが寄与していることが述べられている。 For example, Japanese Patent Application Laid-Open No. Sho 62-215759 (Patent Document 1) discloses an inorganic plate laminated with a metal plate as an inorganic plate backed with such a metal sheet, particularly an inorganic plate backed with a metal plate. Here, there is a description that the metal plate may be a perforated plate. Japanese Patent Laying-Open No. 2009-133307 (Patent Document 2) discloses a stone floor material in which metal plates provided with a large number of holes are bonded together. An elastic adhesive is often used for bonding the inorganic board and the backing material. However, when the floor tile is constructed with an elastic adhesive, it is known that the floor tile is easily broken by an external impact (Non-patent Document 1). See). Non-Patent Document 1 describes that the material, elastic modulus and elongation of the adhesive contribute to the impact resistance of the floor tile.
本発明者は、無機質板への裏打ちは、曲げ強度に対しては強化されるが、耐衝撃性の強化には必ずしも十分ではなく、無機質板と裏打材との間に介在する接着剤の厚さを極力薄くすることが、耐衝撃性の強化には有効であるとの知見を得た。しかしながら、一辺が60cm以上となる大型無機質板の裏打ちを、接着剤の厚みをムラなく薄くすることは困難であった。そこで、鋭意検討の結果、裏打材の特定の面を無機質板と張り合わせる面とすることで、広い面積を均質な接着剤厚みとなる複合板を容易に得ることができ、これにより、十分な曲げ強度および耐衝撃性を確保した、薄型で大型の複合板を提供可能である、との知見を得た。すなわち、本発明は、十分な曲げ強度および耐衝撃性を備えた、薄型で大型の複合板の提供を、目的とするものである。 The present inventor believes that the backing to the inorganic plate is strengthened with respect to the bending strength, but is not necessarily sufficient to enhance the impact resistance, and the thickness of the adhesive interposed between the inorganic plate and the backing material. It was found that making the thickness as thin as possible is effective for enhancing the impact resistance. However, it has been difficult to reduce the thickness of the adhesive without unevenness on the backing of a large-sized inorganic plate having a side of 60 cm or more. Therefore, as a result of diligent examination, by making the specific surface of the backing material a surface to be bonded to the inorganic plate, a composite plate having a uniform adhesive thickness over a large area can be easily obtained. It was found that it is possible to provide a thin and large composite plate that ensures bending strength and impact resistance. That is, an object of the present invention is to provide a thin and large composite plate having sufficient bending strength and impact resistance.
そして、本発明による複合板は、
化粧面と裏面とを有する無機質板と、前記裏面に接着された、厚み方向に貫通している貫通孔が複数配設された金属板とを備えてなり、前記金属板は、前記貫通孔の周縁に突起を有する面が、前記裏面に接着剤により接着されてなり、前記突起は、前記突起と、当該突起の近傍の前記金属板表面と、前記無機質板の裏面とで形成される領域を保持するスペーサとして機能し、前記接着剤は、前記領域に存在することを特徴とする複合板である。
And the composite board by this invention is
An inorganic plate having a decorative surface and a back surface; and a metal plate bonded to the back surface and provided with a plurality of through-holes penetrating in the thickness direction. A surface having a protrusion on the periphery is bonded to the back surface with an adhesive, and the protrusion includes a region formed by the protrusion, the surface of the metal plate in the vicinity of the protrusion, and the back surface of the inorganic plate. The composite board functions as a holding spacer, and the adhesive is present in the region .
定義
無機質板
本発明において用いられる無機質板は、例えば陶磁器、石、またはガラスからなり、床、壁、家具またはキッチンカウンターの仕上材や面材として用いられる。従って、無機質板は、意匠が施された化粧面と、裏面とを備える。また、その大きさは限定されないが、比較的大型の無機質板を好ましく用いることが出来、本発明の一つの態様によれば、無機質板は短辺300mmを超えるものであり、900cm2を超える面積を有するものである。無機質板の短辺の長さは、好ましくは600mm以上、より好ましくは900mm以上を有するものである。
Definition
Inorganic plate The inorganic plate used in the present invention is made of, for example, ceramic, stone, or glass, and is used as a finishing material or a face material of a floor, a wall, furniture, or a kitchen counter. Therefore, an inorganic board is provided with the decorative surface to which the design was given, and the back surface. Further, the size is not limited, but a relatively large inorganic plate can be preferably used. According to one aspect of the present invention, the inorganic plate has a short side exceeding 300 mm and an area exceeding 900 cm 2. It is what has. The length of the short side of the inorganic plate is preferably 600 mm or more, more preferably 900 mm or more.
さらに本発明は、比較的薄い無機質板に好ましく適用できる。例えば、大型の陶磁器板では軽量化のため、例えば厚さは3mm以上15mm程度まで、好ましくは10mm程度まで、より好ましくは8mm程度まで、さらに好ましくは6mm程度までとされる。 Furthermore, the present invention can be preferably applied to a relatively thin inorganic plate. For example, in order to reduce the weight of a large ceramic plate, for example, the thickness is 3 mm to 15 mm, preferably about 10 mm, more preferably about 8 mm, and even more preferably about 6 mm.
本発明において無機質板は、その表面に釉薬層を有していてもよい。釉薬の成分は特に限定されない。釉薬層の形成は、成形後に施釉し、成形体と一体的に焼成するか、または、焼成体(仮焼体)に施釉した後に焼成するか、いずれかの方法を用いてもよい。さらに、施釉の前後に乾燥工程を設けてもよい。 In the present invention, the inorganic plate may have a glaze layer on its surface. The ingredient of the glaze is not particularly limited. The glaze layer may be formed by either glazing after molding and firing integrally with the molded body, or by firing after glazing the calcined body (calcined body). Furthermore, you may provide a drying process before and after glazing.
無機質板は、裏面に裏足やバックプリントが施されていないものが好適に利用できる。一般的に、裏足もバックプリントも、無機質板と接着剤との接触面積を増すことで、無機質板の被接着面との密着力を向上させるために設けられることがあるが、本発明においては、無機質板は裏面が平坦であることが好ましい。裏面が平坦であることで、接着剤の厚みを薄く均一にすることが可能となる。ここで、裏足とは、無機質板の裏面に凸部を一体的に成形してなるものをいう。また、バックプリントとは、無機酸化物の微粒子を含有するインクにより、線状、点状、格子状、等に無機質板の裏面に印刷を施し、前記無機酸化物の微粒子を無機質板の裏面に固定してなるものをいう。 As the inorganic board, those having no back foot or back print on the back surface can be suitably used. In general, both the back foot and the back print may be provided to increase the contact area between the inorganic board and the adhesive to improve the adhesion with the adherend surface of the inorganic board. The inorganic plate preferably has a flat back surface. Since the back surface is flat, the thickness of the adhesive can be made thin and uniform. Here, a back foot means what forms a convex part integrally in the back of an inorganic board. In addition, the back print means that the ink containing the inorganic oxide fine particles is printed on the back surface of the inorganic plate in a line shape, a dot shape, a lattice shape, etc., and the inorganic oxide fine particles are applied to the back surface of the inorganic plate. It means something fixed.
裏打材
本発明において用いられる裏打材は、厚み方向に貫通している貫通孔が複数配設された金属板である。本発明において、このような金属板は、パンチングメタル、打ち抜き金網、パーフォレーテッドメタル等の名で呼ばれるものであり、以下、これらを総称してパンチングメタルと称することがある。パンチングメタルの穴の開いた割合、すなわち開口率は、無機質板の強度を向上できる限り、特に限定されない。また、穴の形状も特に限定されず、またその配置、配列も、無機質板の強度を向上できる限り適宜決定されてよい。また、本発明の一つの態様によれば、金属板の厚みも適宜決定されてよいが、無機質板よりも薄く、例えば無機質板の10%程度の厚さであることが好ましい。
Backing Material The backing material used in the present invention is a metal plate in which a plurality of through holes penetrating in the thickness direction are provided. In the present invention, such a metal plate is called by a name such as a punching metal, a punched wire mesh, a perforated metal, and the like, and hereinafter, these may be collectively referred to as a punching metal. The ratio of the punched metal holes, that is, the opening ratio is not particularly limited as long as the strength of the inorganic plate can be improved. Further, the shape of the holes is not particularly limited, and the arrangement and arrangement thereof may be appropriately determined as long as the strength of the inorganic plate can be improved. Moreover, according to one aspect of the present invention, the thickness of the metal plate may be determined as appropriate, but it is preferably thinner than the inorganic plate, for example, about 10% of the thickness of the inorganic plate.
パンチングメタルは、プレス加工により穴形成されるため、パンチによる打ち抜き方向に応じて、バリが形成される面とダレが形成される面とを備える。本発明において、裏打材は、バリが形成される面を無機質板との張り合わせ面とする。バリはプレス加工後の状態がそのまま残存していてもよく、塗装や研磨などにより後加工された状態であってもよい。市販されているパンチングメタルは後加工によってバリが除去された状態のものは少なく、また、バリの一部または全部が除去されたものであっても、バリが形成される面には貫通孔の付近に反りが残存する。そのため、バリがそのまま存在する場合も、バリが後加工された場合も、貫通孔の周縁に、当該周縁の近傍の金属板表面よりも盛り上がった突起を有する。バリがそのまま残存する場合、すなわち、突起がバリである場合は、貫通孔の周縁の盛り上がりが顕著で、突出している。突起は貫通孔の周縁に沿って連続的に形成されたものであることが好ましい。例えば、円形の貫通孔である場合、突起は貫通孔周縁に略円筒状に備わっていることが好ましい。本発明においては、パンチングメタル表面の当該突起に挟まれた凹部に、無機質板と裏打材とを張り合わせる接着剤の層が形成される。 Since the punching metal is formed with a hole by press working, it has a surface on which burrs are formed and a surface on which sagging is formed in accordance with the direction of punching. In the present invention, the backing material has a surface on which a burr is formed as a bonding surface with an inorganic plate. The burrs may remain as they are after pressing, or may be post-processed by painting or polishing. There are few commercially available punching metals from which burrs have been removed by post-processing, and even if some or all of the burrs have been removed, there are through holes on the surface where burrs are formed. Warpage remains in the vicinity. Therefore, both when the burr is present as it is and when the burr is post-processed, the peripheral edge of the through hole has a protrusion raised above the surface of the metal plate in the vicinity of the peripheral edge. When the burr remains as it is, that is, when the protrusion is a burr, the rise of the peripheral edge of the through hole is remarkable and protrudes. The protrusion is preferably formed continuously along the periphery of the through hole. For example, in the case of a circular through hole, the protrusion is preferably provided in a substantially cylindrical shape around the periphery of the through hole. In the present invention, an adhesive layer for bonding the inorganic plate and the backing material is formed in a recess sandwiched between the protrusions on the surface of the punching metal.
突起の高さの好適範囲は0.01mm以上0.8mm以下、より好ましい範囲は0.02mm以上0.3mm以下である。当該範囲であれば、突起がスペーサの役割を果たすので、接着剤の層厚みを薄く、均一にすることが可能となり、大型の無機質板であってもムラなく所望の強度が得られる点で、好ましい。また、複合板の面方向の応力に耐える力を高めることができる点でも、好ましい。 A preferable range of the height of the protrusion is 0.01 mm or more and 0.8 mm or less, and a more preferable range is 0.02 mm or more and 0.3 mm or less. In this range, since the protrusions serve as spacers, the adhesive layer thickness can be made thin and uniform, and even if it is a large inorganic plate, the desired strength can be obtained without unevenness, preferable. Moreover, it is preferable also in the point which can raise the force which can endure the stress of the surface direction of a composite board.
複合板
本発明において用いられる複合板1は、上記無機質板に、上記裏打材を接着させたものである。その基本構造は図1〜6に示される通りである。図1は、床材1を構成する無機質板11と裏打材12と接着させる前の状態を表す図であり、裏打材12は、好ましくは図2および図3に示されるような丸い穴が複数あけられたパンチングメタルである。図4は、図1においてAと示される部分の拡大図であり、無機質板11とパンチングメタル12とが対向して、接着剤により張り合わされる。
Composite plate The composite plate 1 used in the present invention is obtained by bonding the backing material to the inorganic plate. Its basic structure is as shown in FIGS. FIG. 1 is a view showing a state before the inorganic board 11 and the backing material 12 constituting the flooring 1 are bonded, and the backing material 12 preferably has a plurality of round holes as shown in FIGS. This is a punched metal. FIG. 4 is an enlarged view of a portion indicated by A in FIG. 1, and the inorganic plate 11 and the punching metal 12 face each other and are bonded together with an adhesive.
本発明にあっては、無機質板11と、裏打材であるパンチングメタル12とは接着剤により接着され一体とされる。このように一体化することで、厚みをそれほど増加させずに、全体の強度を向上させることができる。図5は、無機質板11と裏打材12と接着させた後の複合板1の模式図であり、図6は複合板1の断面の部分拡大図である。 In the present invention, the inorganic plate 11 and the punching metal 12 which is the backing material are bonded and integrated with an adhesive. By integrating in this way, the overall strength can be improved without increasing the thickness so much. FIG. 5 is a schematic view of the composite plate 1 after bonding the inorganic plate 11 and the backing material 12, and FIG. 6 is a partial enlarged view of a cross section of the composite plate 1.
無機質板11とパンチングメタル12との間には接着剤13が、硬化および/または乾燥された状態で、介在するが、貫通孔の部分は無機質板11が露出していることが好ましく、貫通孔の部分には接着剤が存在しないことが、より好ましい。すなわち、穴の底が無機質板の露出した状態であることで、例えば複合板を下地に接着する際に、無機質板は裏打材と下地の双方に接着され、強固な接着力が得られる。そして、このような複合板は、下地に強固に接着されつつ、下地の面に沿った方向の応力を裏打材が遮断して、無機質板の割れ又は欠損が生じ難くなる。 Although the adhesive 13 is interposed between the inorganic plate 11 and the punching metal 12 in a cured and / or dried state, it is preferable that the inorganic plate 11 is exposed at the through hole portion. It is more preferable that no adhesive is present in this part. That is, when the bottom of the hole is in an exposed state of the inorganic plate, for example, when the composite plate is bonded to the base, the inorganic plate is bonded to both the backing material and the base, and a strong adhesive force is obtained. In such a composite plate, the backing material blocks the stress in the direction along the surface of the base while being firmly bonded to the base, and the inorganic plate is not easily cracked or broken.
無機質板とシート状の裏打材とを一体化して、無機質板と床下地とを裏打材で絶縁すると、水平方向の伸縮により床材の剥離が生じやすくなるため、床材と床下地材とを強固に接着することができなかったが、本発明は貫通孔が存在する部分の無機質板が露出しているため、この相反する課題、すなわち強固な接着と剥離とのトレードオフを解決することができる。 If the inorganic board and the sheet-like backing material are integrated and the inorganic board and the floor substrate are insulated with the backing material, the floor material tends to peel off due to horizontal expansion and contraction. Although it was not possible to bond firmly, the present invention can solve the conflicting problem, that is, the trade-off between strong bonding and peeling, because the portion of the inorganic plate where the through hole exists is exposed. it can.
本発明の複合板1は、金属板12の貫通孔周縁に突起121を有する面、換言すれば、バリが形成される面が、無機質板11に張り合わされてなる。これにより、金属板の貫通孔周縁の突起と、突起の近傍の金属板表面と、無機質板の裏面とで形成される領域に接着剤13の層を形成することができる。貫通孔周縁は、突起によってその近傍よりも盛り上がった形状であるため、この突起がスペーサの役割を果たし、接着剤の層厚みを薄く、均一にすることが可能となり、これにより、十分な曲げ強度および耐衝撃性を確保した、薄型で大型の複合板を提供できる。 In the composite plate 1 of the present invention, the surface having the protrusion 121 on the periphery of the through hole of the metal plate 12, in other words, the surface on which the burr is formed is bonded to the inorganic plate 11. Thereby, the layer of the adhesive 13 can be formed in a region formed by the protrusion on the periphery of the through hole of the metal plate, the surface of the metal plate near the protrusion, and the back surface of the inorganic plate. Since the peripheral edge of the through-hole is raised by the protrusion, the protrusion acts as a spacer, making it possible to make the adhesive layer thin and uniform, thereby providing sufficient bending strength. In addition, it is possible to provide a thin and large composite plate that ensures impact resistance.
本発明において、突起121はバリであることが好ましく、バリが無機質板11の裏面と接していることが、より好ましい。このようにすることで、バリがスペーサの役割を果たし、接着剤の層厚みを薄く、均一にすることが可能となるだけでなく、バリで閉ざされた空間に接着剤が存在することになり、接着剤の露出度を低減することが可能となる。これにより、金属板と無機質板との接着に使用する接着剤と、本発明の複合板を張り付ける際に使用する接着剤とが異なる種類である場合に発生し得る接着剤の変質を防ぐことができる。 In the present invention, the protrusion 121 is preferably a burr, and more preferably, the burr is in contact with the back surface of the inorganic plate 11. In this way, the burr acts as a spacer, and not only can the thickness of the adhesive layer be thin and uniform, but also the adhesive is present in the space closed by the burr. It becomes possible to reduce the degree of exposure of the adhesive. This prevents alteration of the adhesive that may occur when the adhesive used for bonding the metal plate and the inorganic plate is different from the adhesive used when the composite plate of the present invention is attached. Can do.
接着剤の層厚みは、0.01mm以上0.8mm以下である。突起、好適にはバリが、スペーサの役割を果たすことにより、薄い層を広い面積で均一に形成できる。これによって所望の接着強度を大面積であってもムラなく得ることが可能となる。また、接着剤の層厚みと突起の高さとが同じ程度にすることにより、接着剤の露出を抑えることが可能となる。ここで、接着剤の層厚みは、複数の貫通孔を跨ぐ位置で複合板を切断し、切断面を複合板に対して垂直に研磨して得た面において、貫通孔と隣り合う貫通孔との中間部を5点計測し、それらの平均値で表す。 The layer thickness of the adhesive is 0.01 mm or more and 0.8 mm or less. The protrusion, preferably a burr, serves as a spacer, so that a thin layer can be uniformly formed over a wide area. This makes it possible to obtain a desired adhesive strength evenly even with a large area. Further, by making the layer thickness of the adhesive and the height of the protrusions approximately the same, the exposure of the adhesive can be suppressed. Here, the layer thickness of the adhesive is such that the composite plate is cut at a position across a plurality of through holes, and the cut surface is polished perpendicularly to the composite plate, and the through holes adjacent to the through holes are The middle part is measured at five points and expressed as an average value thereof.
本発明の複合板1の表面は、無機質板の化粧面がある面であり、複合板1の裏面は、金属板12の貫通孔の周縁に、ダレ122を有する面である。これにより、複合板を張り合わせる際に使用する接着剤が、穴の奥に入り込みやすくなる。さらに、プレス加工によって貫通孔の側壁に形成される「せん断面」および「破断面」の位置が、複合板の裏面から見て手前側にせん断面、奥に破断面が配置されることになる。本発明の複合板を使用する際、貫通孔に複合板を固定するための固定部材を挿入する場合があるが、せん断面を手前側に配置することによって、固定部材をより強固に固定することができる。 The surface of the composite plate 1 of the present invention is a surface having a decorative surface of an inorganic plate, and the back surface of the composite plate 1 is a surface having a sag 122 on the periphery of the through hole of the metal plate 12. This makes it easier for the adhesive used when the composite plates are bonded together to enter the back of the hole. Furthermore, the positions of the “shear surface” and “fracture surface” formed on the side wall of the through hole by pressing are arranged such that the shear surface is on the front side and the fracture surface is on the back as viewed from the back surface of the composite plate. . When using the composite plate of the present invention, a fixing member for fixing the composite plate may be inserted into the through hole, but by fixing the shearing surface on the near side, the fixing member is fixed more firmly. Can do.
上記の無機質板11とパンチングメタル12との間には接着剤13が介在するが、穴の部分は無機質板11が露出しており、穴の部分には接着剤が存在しない床材は、パンチングメタルの側に接着剤を塗布し、無機質板と圧着させることにより、好ましく製造できる。 Although the adhesive 13 is interposed between the inorganic plate 11 and the punching metal 12, the floor portion in which the inorganic plate 11 is exposed in the hole portion and no adhesive exists in the hole portion is punched. It can manufacture preferably by apply | coating an adhesive agent to the metal side and crimping | bonding with an inorganic board.
接着剤は、複合板の用途に応じて選定されるが、好適には微弾性接着剤、または靱性のある硬い接着剤が好ましい。接着剤の塗布方法は、接着剤の性状に応じて、ロールコーター、スプレー塗布、ナイフコーターなど様々な塗布方法が適宜選択される。圧着方法は、ロールプレス、または平面プレスを適用できるが、無機質板が大型であるほど、均一な接着剤厚みや強度が得られる点で、平面プレスが好ましい。 The adhesive is selected according to the use of the composite plate, and preferably a microelastic adhesive or a tough hard adhesive is preferable. As an application method of the adhesive, various application methods such as a roll coater, a spray application, and a knife coater are appropriately selected according to the properties of the adhesive. A roll press or a flat press can be applied as the pressure-bonding method, but a flat press is preferred in that the larger the inorganic plate, the more uniform adhesive thickness and strength can be obtained.
本発明の複合板は、壁や床の仕上材、キャビネットの面材、カウンタートップ、建具(ドア、間仕切りの仕上材)など、種々の用途に適用できる。特に、薄型・大型であるにもかかわらず耐衝撃性が優れる点で、重厚感しか持たせられなかったテーブルやカウンターを、薄型でライトテイストなデザインで提案することが可能となる。 The composite board of the present invention can be applied to various uses such as finishing materials for walls and floors, cabinet face materials, counter tops, and joinery (finishing materials for doors and partitions). In particular, it is possible to propose tables and counters that have only a profound feeling because they are excellent in impact resistance despite being thin and large, with a thin and light design.
1…複合板、11…無機質板、12…裏打材、パンチングメタル、121…突起、バリ、122…ダレ、13…接着剤 DESCRIPTION OF SYMBOLS 1 ... Composite board, 11 ... Inorganic board, 12 ... Backing material, punching metal, 121 ... Protrusion, burr | flash, 122 ... Sag, 13 ... Adhesive
Claims (6)
前記裏面に接着された、厚み方向に貫通している貫通孔が複数配設された金属板とを備えてなる複合板であって、
前記金属板は、前記貫通孔の周縁に突起を有する面が、前記裏面に接着剤により接着されてなり、
前記突起は、前記突起と、当該突起の近傍の前記金属板表面と、前記無機質板の裏面とで形成される領域を保持するスペーサとして機能し、
前記接着剤は、前記領域に存在することを特徴とする、複合板。 An inorganic board having a decorative surface and a back surface;
A composite plate comprising a metal plate bonded to the back surface and provided with a plurality of through holes penetrating in the thickness direction,
The metal plate has a surface having protrusions on the periphery of the through hole, and is adhered to the back surface with an adhesive .
The protrusion functions as a spacer that holds a region formed by the protrusion, the metal plate surface in the vicinity of the protrusion, and the back surface of the inorganic plate,
The composite board according to claim 1, wherein the adhesive is present in the region .
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