WO2023017770A1 - Panel for concrete formwork - Google Patents

Panel for concrete formwork Download PDF

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Publication number
WO2023017770A1
WO2023017770A1 PCT/JP2022/029886 JP2022029886W WO2023017770A1 WO 2023017770 A1 WO2023017770 A1 WO 2023017770A1 JP 2022029886 W JP2022029886 W JP 2022029886W WO 2023017770 A1 WO2023017770 A1 WO 2023017770A1
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Prior art keywords
panel
concrete
resin sheet
concrete formwork
resin
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PCT/JP2022/029886
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French (fr)
Japanese (ja)
Inventor
清造 香川
耕三 竹下
宏 谷脇
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大倉工業株式会社
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Publication of WO2023017770A1 publication Critical patent/WO2023017770A1/en

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G9/00—Forming or shuttering elements for general use
    • E04G9/10—Forming or shuttering elements for general use with additional peculiarities such as surface shaping, insulating or heating, permeability to water or air

Definitions

  • the present invention relates to a panel used as a formwork used when placing concrete. More specifically, it relates to a panel for concrete formwork that has a smooth surface and excellent wear resistance and that can be used repeatedly.
  • Patent Document 1 is an invention aimed at providing a panel for concrete formwork (equivalent to "plywood for concrete formwork” in Patent Document 1) that can be used repeatedly and has excellent weather resistance and concrete surface finish.
  • the plywood surface is coated with an ethylene-vinyl acetate copolymer resin, and then covered with a resin sheet (corresponding to the "thermoplastic synthetic resin” in Patent Document 1) having a higher surface hardness than the ethylene-vinyl acetate copolymer resin. do.
  • Polyethylene resin, polypropylene resin, and polyvinyl chloride resin are used for the resin sheet, and high-density polyethylene resin is preferable because of its excellent durability.
  • the thickness of the resin sheet must be 120 to 300 ⁇ m, and increasing the thickness increases the cost.
  • Patent Document 2 is an invention aimed at providing a concrete formwork panel (equivalent to "composite coated formwork plywood” in Patent Document 2) with excellent smoothness. Or on the surface of a medium-density fiberboard formed by integrally molding a medium-density fiberboard (equivalent to "medium-density fiber” in Patent Document 2) on the surface of a plywood made of broadleaf wood (lauan wood, miscellaneous wood) via an adhesive. , and a high-hardness resin coating is provided. By coating the surface of the medium-density fiberboard with resin, it becomes a surface with a high degree of smoothness. The concrete surface produced using this concrete formwork panel is smooth.
  • the surface hardness is sufficient, when the concrete adhering to the surface of the concrete formwork is removed with a spatula after the concrete formwork is used, the surface of the resin coating may be damaged. There is a problem that if the resin-coated surface is damaged, the concrete formwork cannot be reused.
  • An object of the present invention is to provide a panel for concrete formwork that has excellent surface smoothness and wear resistance and can be used repeatedly. More specifically, it is intended to provide a panel for concrete formwork that can be used repeatedly, making it possible to obtain concrete with a smooth finished surface, preventing the surface from being damaged by operations such as removing concrete adhering to the surface of the concrete formwork with a spatula.
  • a concrete formwork panel in which a resin sheet is laminated on the surface of the wood fiber board side of the wood composite board made of plywood and wood fiber board, the wear loss measured on the surface side of the resin sheet in accordance with the JAS 1073 abrasion A test.
  • a concrete mold characterized by having a wear loss per unit area of the worn area (mass obtained by subtracting the mass of the test piece after 500 rotations from the mass of the test piece before 500 rotations) of 1.000 g/m 2 or less.
  • a framing panel is provided.
  • a panel for concrete formwork wherein the wear loss per unit area of the worn area is 0.400 g/m2 or less.
  • a panel for concrete formwork wherein the surface side of the resin sheet has a pencil hardness (JIS K5600-5-4) of H or more. Further, there is provided a panel for concrete formwork, wherein the wooden fiber board is a particle board or a medium density fiber board.
  • the panel for concrete formwork of the present invention has a surface on which concrete is placed, which is a resin sheet having excellent surface smoothness and releasability, and a composite board made of wood fiberboard and plywood laminated via an adhesive. Therefore, concrete with a smooth finished surface can be obtained.
  • the resin sheet since the resin sheet is laminated on the wood fiber board with an adhesive, the resin sheet can be removed by scraping off the concrete remaining on the surface of the resin sheet of the concrete formwork panel with a spatula. The surface of the surface becomes scratch-resistant, making it possible to use the control panel repeatedly.
  • the surface of the resin sheet is hard to be damaged, it is possible to obtain a finished concrete with a smooth surface even after repeated use of the concrete panel.
  • the pencil hardness of the surface of the resin sheet of the concrete formwork panel is H or higher, the surface of the resin sheet does not become concave, and concrete with a smoother surface can be obtained. Repeated use becomes possible. Furthermore, surface smoothness can be imparted by using a particle board or a medium-density fiberboard as the wood fiberboard.
  • FIG. 1 is a schematic cross-sectional view showing one embodiment of a panel for concrete formwork of the present invention
  • a control panel 1 of the present invention is mainly composed of a wooden composite board 2 and a resin sheet 3.
  • a resin sheet is laminated on the surface of the wood fiber board side of the wood composite board made of plywood and wood fiber board, and the surface side of the resin sheet is measured according to JAS 1073 Abrasion A test.
  • the wear loss per unit area of the wear area of the wear loss (mass obtained by subtracting the mass of the test piece after 500 rotations from the mass of the test piece before 500 rotations) is preferably 1.000 g / m 2 or less, It is more preferably 0.500 g/m 2 or less, and even more preferably 0.400 g/m 2 or less.
  • the wear resistance is excellent, and it is possible to remove the concrete remaining on the surface of the resin sheet of the control panel with a spatula.
  • the surface of the resin sheet is hard to be damaged. Therefore, it is possible to use the control panel repeatedly. Furthermore, since the surface of the resin sheet is hard to damage, even if the concrete panel is repeatedly used, the finished surface of the concrete can be smooth.
  • the abrasion loss indicating the abrasion resistance can be adjusted by the resin sheet, the adhesive and the wood fiber board, which will be described later. In particular, the resin sheet on the outermost surface of the control panel can be adjusted to the abrasion loss.
  • the pencil hardness of the surface side of the resin sheet measured according to JIS K5600-5-4 is preferably H or higher, more preferably 2H or higher, and even more preferably 3H or higher.
  • the pencil hardness is H or higher, even if the concrete on the surface of the resin sheet of the control panel is peeled off with a spatula, dents are less likely to occur. Therefore, it is possible to obtain a finished concrete with a smoother surface and to use the concrete panel more times.
  • the present invention is characterized in that the wood composite board 2 is composed of a plywood 21 and a wood fiber board 22 .
  • the plywood 21 broad-leaved plywood such as Japanese cypress, birch, Japanese beech, beech, oak, lauan, selaya, meranti, capol, and apiton; coniferous plywood, fast-growing plywood of planted trees such as poplar, falcata, acacia, chamelele, eucalyptus, terminalaria, etc., can be used without particular limitation.
  • the wood fiber board 22 is laminated on the surface of the plywood 21, the plywood 21 is not required to have surface smoothness.
  • the thickness of the plywood 21 is not particularly limited, it is preferably 2 mm or more and 20 mm or less, more preferably 5 mm or more and 15 mm or less, and particularly 7 mm or more and 12 mm or less, in terms of strength and price. is preferred, preferably 3-5 ply plywood.
  • a particle board formed by chipping wood and molded with an adhesive or the like, a medium density fiber board (MDF) formed by defibrating wood, a hard board, or the like can be used without particular limitation.
  • MDF medium density fiber board
  • both surface layers of the particle board may be composed mainly of the above-described extremely fine chips, and the chips having a size of about 0.5 to 100 mesh between them may be used as the main component.
  • the particle board has a smooth surface and is relatively lightweight.
  • the thickness of the wood fiber board 22 is not particularly limited. It is preferably 2 mm or more and 6 mm or less, particularly 2 mm or more and 6 mm or less.
  • the resin sheet 3 of the present invention is laminated on the surface of the wood fiber board of the wood composite board, and has wear resistance against spatula and the like, It is provided for the purpose of releasability from concrete and imparting surface smoothness.
  • the resin sheet 31 laminated on the surface of the control panel 1 of the present invention may satisfy the wear resistance test in the state of the control panel, and the wear resistance is the type of resin of the resin sheet, the thickness of the resin sheet It can be appropriately adjusted depending on the surface condition such as surface treatment.
  • the resin sheet any resin sheet used in conventional film-finishing compound panels can be used without particular limitation.
  • a coating film layer may be provided on the surface of the resin sheet, or the resin sheet may be crosslinked.
  • the material used for the resin sheet on the surface of the back surface (the surface of the plywood) of the control panel 1 of the present invention. This prevents the control panel from swelling due to water.
  • the same resin sheet may be used for both the front surface and the back surface, or different resin sheets may be used.
  • the thickness of the resin sheet 31 is preferably 10 ⁇ m or more and 400 ⁇ m or less, particularly preferably 20 ⁇ m or more and 100 ⁇ m or less, further preferably 20 ⁇ m, from the viewpoint of the balance between wear resistance and price because the compound panel is repeatedly used. It is preferable that the thickness is not less than 40 ⁇ m and not more than 40 ⁇ m.
  • the resin sheet 31 is laminated on the wood fiber board 22 of the wood composite board 2 via the adhesive 4 . Therefore, the wettability of the surface of the resin sheet 31 to which the adhesive 4 is applied is preferably adjusted. More specifically, it is preferable that the surface wetting index is adjusted to 40 to 60 mN/m, more preferably 45 to 55 mN/m, by corona discharge treatment, plasma treatment, or the like. If the wetness index is less than 40 mN/m, the resin sheet 31 may peel off from the wood fiber board 22 . Further, an easy-adhesion layer may be provided on the surface of the resin sheet to which the adhesive is applied, or an easy-adhesion layer may be provided in addition to the corona discharge treatment.
  • the wettability of the resin sheet 31 is adjusted only on the surface to which the adhesive 4 is applied, and not adjusted on the opposite surface. Specifically, it is desirable that the surface of the resin sheet opposite to the wood fiber board has a wettability index of less than 40 mN/m. The surface of the resin sheet opposite to the wood fiber board side comes into direct contact with the concrete, but if the wettability index of this surface is high, it becomes difficult to peel off the concrete panel 1 after the concrete hardens.
  • a synthetic resin is extruded into a cylindrical shape by an inflation extrusion method, and this is flattened with a nip roll or the like and subjected to a corona discharge treatment or a plasma treatment. Just do it.
  • a corona discharge treatment or a plasma treatment Just do it.
  • the inner surface of the flat tubular film is not treated, and only the outer surface is treated.
  • the resin sheet 3 whose wettability is adjusted only on one side.
  • adhesives used for laminating the wood fiber board 22 and the resin sheet 31 and the adhesive used for laminating the plywood 21 and the wood fiber board 22 can be used without particular limitation.
  • adhesives can be used without particular limitation.
  • ethylene vinyl acetate resin adhesives, polyvinyl acetate resin adhesives, epoxy resin adhesives, urethane resin adhesives, acrylic resin adhesives, hot-melt adhesives, pressure-sensitive adhesives, etc. are used as appropriate depending on the type of resin sheet. It can be selected and used.
  • the panel for concrete formwork 1 of the present invention is obtained by applying an adhesive to one surface of a resin sheet, bonding a wood fiber board 22 to the coated surface, and then bonding it to the other surface of the table of contents 2. It can be manufactured by applying the agent and laminating the plywood 21 on the applied surface. Alternatively, after applying an adhesive to one surface of the wood fiber board 22 and bonding the resin sheet 31 to the applied surface, the adhesive is applied to the other surface of the wood fiber board 22, and the applied surface is plywood. 21 can be laminated together.
  • a disc-shaped test piece having a diameter of about 120 mm is prepared from the concrete formwork panel of the example and comparative example, and a hole having a diameter of 10 mm is made in the center of the test piece.
  • JAS 1073 Abrasion A test 500 g load, wear area of about 0.3043 m 2 (outer diameter 90 mm, inner diameter 65 mm donut circle)
  • the abrasive paper is in contact with the resin sheet side or the coating layer side of the test piece.
  • the wear loss per unit area of the worn area is 1.000 g/m 2 or less, it is evaluated as ⁇ , and when it is more than 1.000 g/m 2 , it is evaluated as x.
  • Example 1 A polyethylene terephthalate film (hereinafter referred to as “PET”) with an easily adhesive layer having a thickness of 12 ⁇ m and having only one side subjected to corona discharge treatment was prepared as a resin sheet. Apply glue consisting of coalescence. Next, a particle board (hereinafter referred to as “PB”) having a thickness of 3 mm is laminated on the surface to which the adhesive is applied. Next, an ethylene-vinyl acetate adhesive was applied to the surface of the PB, and cypress plywood (5 plies, 9 mm) was laminated to produce a panel for concrete formwork.
  • PTT polyethylene terephthalate film
  • PB particle board
  • cypress plywood 5 plies, 9 mm
  • Example 2 A panel for concrete formwork was produced in the same manner as in Example 1, except that a 25 ⁇ m thick PET having an easy-adhesion layer provided only on one side was used as the resin sheet.
  • Example 3 A panel for concrete formwork was produced in the same manner as in Example 1, except that PET having a thickness of 38 ⁇ m having an easy-adhesion layer provided only on one side was used as the resin sheet.
  • Example 4 A panel for concrete formwork was produced in the same manner as in Example 1, except that a 40 ⁇ m-thick high-density polyethylene film (hereinafter referred to as “HDPE”) that had been subjected to corona discharge treatment on only one side was used as the resin sheet.
  • Example 5 A panel for concrete formwork was produced in the same manner as in Example 1, except that a 20 ⁇ m-thick HDPE having only one surface subjected to corona discharge treatment was used as the resin sheet.
  • HDPE high-density polyethylene film
  • Example 6 A 40 ⁇ m-thick polyethylene-based resin multilayer film (linear low-density polyethylene/high-density polyethylene/linear low-density polyethylene) (hereinafter referred to as “LL/HD/LL”) having a thickness of 40 ⁇ m and having only one surface subjected to corona discharge treatment as a resin sheet.
  • LL/HD/LL linear low-density polyethylene/high-density polyethylene/linear low-density polyethylene
  • Example 7 A panel for concrete formwork was produced in the same manner as in Example 1, except that a 12 ⁇ m-thick polybutylene terephthalate film (hereinafter referred to as “PBT”) that had been subjected to corona discharge treatment on only one side was used as the resin sheet. .
  • PBT polybutylene terephthalate film
  • the concrete panels using PET as the resin sheet of Examples 1 to 3 did not damage the resin sheet when the concrete was scraped off, and the surface of the resin sheet did not dent. Therefore, it was possible to obtain a finished concrete with a smooth surface even after repeated use. Furthermore, when the surface of the finished concrete was confirmed, it was glossy and excellent.
  • the concrete panels provided with a coating layer on the surface of the plywood of Comparative Examples 1 to 4 did not satisfy wear resistance, so after removing the concrete, when scraping off the concrete remaining on the surface of the concrete panel with a spatula. The surface of the coating layer was damaged. When the concrete panel was used again, the finished concrete was damaged or dented.

Abstract

[Problem] To provide a panel for concrete formwork which has excellent surface smoothness and abrasion resistance, and which can be repeatedly used. Specifically, the purpose of the present invention is to provide a panel for concrete formwork with which it is possible to obtain concrete with a smooth finished surface, and which can be repeatedly used because the surface of the panel for concrete formwork is less likely to be damaged by work such as removing concrete adhering to the surface with a spatula. [Solution] A panel for concrete formwork comprising a wooden composite board consisting of a plywood board and a wooden fiber board, and a resin sheet layered on a surface of the wooden composite board on the wooden fiber board side. The panel for concrete formwork is characterized in that the abrasion loss per unit abrasion area of the abrasion loss (mass obtained by subtracting the mass of a test piece after 500 rotations from the mass of the test piece before 500 rotations) measured in conformity to JAS 1073 Abrasion A Test on the surface side of the resin sheet is less than or equal to 1.000 g/m2. The panel for concrete formwork is further characterized in that the pencil hardness measured in conformity to JIS K5600-5-4 on the surface side of the resin sheet is greater than or equal to H.

Description

コンクリート型枠用パネルConcrete formwork panel
　本発明は、コンクリート打設時に使用する型枠として用いられるパネルに関する。詳しくは、表面が平滑性、耐摩耗性に優れ、繰り返し使用可能なコンクリート型枠用パネルに関する。 The present invention relates to a panel used as a formwork used when placing concrete. More specifically, it relates to a panel for concrete formwork that has a smooth surface and excellent wear resistance and that can be used repeatedly.
　市場に流通しているコンクリート型枠用パネル（以下、必要に応じ「コンパネ」と略称する）の多くは東南アジアから輸入された合板が基材として用いられている。コンクリート表面に平滑性が求められない用途には、その合板をそのまま使用する「生コンパネ」が用いられることが多く、平滑性が求められる用途には、その合板に塗装を施した「塗装コンパネ」等が用いられることが多い。 Most of the concrete formwork panels on the market (hereafter abbreviated as "conpanes" when necessary) use plywood imported from Southeast Asia as the base material. For applications where smoothness is not required on the concrete surface, "fresh control panel" that uses the plywood as it is is often used, and for applications that require smoothness, "painted control panel" is applied to the plywood etc. are often used.
　特許文献１は、繰り返し使用可能であり、耐候耐久性やコンクリート表面の仕上がり性に優れたコンクリート型枠用パネル（特許文献１における「コンクリート型枠用合板」に相当）の提供を課題とした発明で、合板表面にエチレン酢酸ビニル共重合樹脂を塗布し、ついでエチレン酢酸ビニル共重合樹脂より表面硬度の高い樹脂シート（特許文献１における「熱可塑性合成樹脂」に相当）を被覆することを特徴とする。前記樹脂シートはポリエチレン樹脂、ポリプロピレン樹脂、ポリ塩化ビニル樹脂が用いられ、耐久性に優れることから高密度ポリエチレン樹脂が好ましいが、合板表面の凹凸や割れがコンクリート型枠用パネルの表面露呈しないように樹脂シートを１２０～３００μｍの厚みにしなければならず、厚くすることでコストアップになっていた。 Patent Document 1 is an invention aimed at providing a panel for concrete formwork (equivalent to "plywood for concrete formwork" in Patent Document 1) that can be used repeatedly and has excellent weather resistance and concrete surface finish. The plywood surface is coated with an ethylene-vinyl acetate copolymer resin, and then covered with a resin sheet (corresponding to the "thermoplastic synthetic resin" in Patent Document 1) having a higher surface hardness than the ethylene-vinyl acetate copolymer resin. do. Polyethylene resin, polypropylene resin, and polyvinyl chloride resin are used for the resin sheet, and high-density polyethylene resin is preferable because of its excellent durability. The thickness of the resin sheet must be 120 to 300 μm, and increasing the thickness increases the cost.
　また特許文献２は、高度の平滑性に優れたコンクリート型枠用パネル（特許文献２における「複合塗装型枠合板」に相当）の提供を課題とした発明で、針葉樹材（落葉松、ラジアータパイン）または広葉樹材（ラワン材、雑木類）からなる合板の表面に接着剤を介して中密度繊維板（特許文献２における「中質繊維）」に相当）を一体成型した中密度繊維板の表面に、さらに高硬度の樹脂塗装を設けることを特徴とする。中密度繊維板の表面に樹脂塗装していることにより、高度の平滑性を持つ表面になる。このコンクリート型枠用パネルを用いてつくられたコンクリート表面は平滑なものになる。しかしながら、表面硬度は十分あるものの、コンクリート型枠を使用後に、コンクリート型枠表面に付着したコンクリートをヘラではがすと樹脂塗装の表面が傷つくことがある。樹脂塗装の表面が傷つくとコンクリート型枠を再使用することができなくなるという問題があった。 In addition, Patent Document 2 is an invention aimed at providing a concrete formwork panel (equivalent to "composite coated formwork plywood" in Patent Document 2) with excellent smoothness. Or on the surface of a medium-density fiberboard formed by integrally molding a medium-density fiberboard (equivalent to "medium-density fiber" in Patent Document 2) on the surface of a plywood made of broadleaf wood (lauan wood, miscellaneous wood) via an adhesive. , and a high-hardness resin coating is provided. By coating the surface of the medium-density fiberboard with resin, it becomes a surface with a high degree of smoothness. The concrete surface produced using this concrete formwork panel is smooth. However, although the surface hardness is sufficient, when the concrete adhering to the surface of the concrete formwork is removed with a spatula after the concrete formwork is used, the surface of the resin coating may be damaged. There is a problem that if the resin-coated surface is damaged, the concrete formwork cannot be reused.
特開昭６２－１１７９５４号公報JP-A-62-117954 特開平１１－１２９２１１号公報JP-A-11-129211
　本発明は、表面平滑性や耐摩耗性に優れ、繰り返し使用可能なコンクリート型枠用パネルの提供を課題とする。詳しくは、仕上がり表面が平滑なコンクリートを得ることが可能で、コンクリート型枠表面に付着したコンクリートをヘラではがすなどの作業で表面が傷つきにくく、繰り返し使用可能なコンクリート型枠用パネルの提供を目的とする。 An object of the present invention is to provide a panel for concrete formwork that has excellent surface smoothness and wear resistance and can be used repeatedly. More specifically, it is intended to provide a panel for concrete formwork that can be used repeatedly, making it possible to obtain concrete with a smooth finished surface, preventing the surface from being damaged by operations such as removing concrete adhering to the surface of the concrete formwork with a spatula. and
　本発明によると、上記課題を解決するための手段として、
合板と木質繊維板からなる木質複合板の木質繊維板側の表面に樹脂シートが積層されたコンクリート型枠用パネルにおいて、前記樹脂シート表面側におけるＪＡＳ　１０７３　摩耗Ａ試験に準拠して測定した摩耗減量（５００回転前の試験片の質量から５００回転後の試験片の質量を差分した質量）の摩耗面積の単位面積あたりの摩耗減量が１．０００ｇ／ｍ２以下であることを特徴とするコンクリート型枠用パネルが提供される。さらには、前記摩耗面積の単位面積あたりの摩耗減量が０．４００ｇ／ｍ２以下であることを特徴とするコンクリート型枠用パネルが提供される。
　また、前記樹脂シートの表面側における鉛筆硬度（ＪＩＳ　Ｋ５６００－５－４）がＨ以上であることを特徴とするコンクリート型枠用パネルが提供される。
　さらに、前記木質繊維板がパーティクルボードまたは中密度繊維板であることを特徴とするコンクリート型枠用パネルが提供される。 According to the present invention, as means for solving the above problems,
In a concrete formwork panel in which a resin sheet is laminated on the surface of the wood fiber board side of the wood composite board made of plywood and wood fiber board, the wear loss measured on the surface side of the resin sheet in accordance with the JAS 1073 abrasion A test. A concrete mold characterized by having a wear loss per unit area of the worn area (mass obtained by subtracting the mass of the test piece after 500 rotations from the mass of the test piece before 500 rotations) of 1.000 g/m 2 or less. A framing panel is provided. Further, there is provided a panel for concrete formwork, wherein the wear loss per unit area of the worn area is 0.400 g/m2 or less.
Further, there is provided a panel for concrete formwork, wherein the surface side of the resin sheet has a pencil hardness (JIS K5600-5-4) of H or more.
Further, there is provided a panel for concrete formwork, wherein the wooden fiber board is a particle board or a medium density fiber board.
　本発明のコンクリート型枠用パネルは、コンクリートを打設する面を表面平滑性かつ離型性に優れた樹脂シートに、接着剤を介して木質繊維板と合板からなる複合板が積層されているため、仕上がり表面が平滑なコンクリートを得ることができる。また、樹脂シートが接着剤を介して木質繊維板に積層した構成をしているため、コンクリート型枠用パネルの樹脂シートの表面に付着して残ったコンクリートをヘラではがすなどの作業で樹脂シートの表面が傷つきにくくなり、コンパネを繰り返し使用することが可能になる。さらに樹脂シートの表面が傷つきにくいことから、コンパネを繰り返し使用しても表面が平滑な仕上がりのコンクリートを得ることができる。 The panel for concrete formwork of the present invention has a surface on which concrete is placed, which is a resin sheet having excellent surface smoothness and releasability, and a composite board made of wood fiberboard and plywood laminated via an adhesive. Therefore, concrete with a smooth finished surface can be obtained. In addition, since the resin sheet is laminated on the wood fiber board with an adhesive, the resin sheet can be removed by scraping off the concrete remaining on the surface of the resin sheet of the concrete formwork panel with a spatula. The surface of the surface becomes scratch-resistant, making it possible to use the control panel repeatedly. Furthermore, since the surface of the resin sheet is hard to be damaged, it is possible to obtain a finished concrete with a smooth surface even after repeated use of the concrete panel.
　また、コンクリート型枠用パネルの樹脂シートの表面の鉛筆硬度がＨ以上であることで、樹脂シートの表面が凹まず、より表面が平滑なコンクリートが得られることができるとともに、より多くの回数の繰り返し使用が可能となる。
　更に、前記木質繊維板がパーティクルボードまたは中密度繊維板であることで、表面平滑性を付与することができる。 In addition, since the pencil hardness of the surface of the resin sheet of the concrete formwork panel is H or higher, the surface of the resin sheet does not become concave, and concrete with a smoother surface can be obtained. Repeated use becomes possible.
Furthermore, surface smoothness can be imparted by using a particle board or a medium-density fiberboard as the wood fiberboard.
本発明のコンクリート型枠用パネルの一実施形態を表す模式的断面図である。BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing one embodiment of a panel for concrete formwork of the present invention;
　以下、図１に基づいて本発明を詳細に説明するが、本発明は以下の形態に限定されるものではなく、同様の効果を奏する範囲において種々の実施形態をとることができる。
　本発明のコンパネ１は、主として木質複合板２と、樹脂シート３とからなる。 Although the present invention will be described in detail below with reference to FIG. 1, the present invention is not limited to the following embodiments, and various embodiments can be implemented within the scope of achieving similar effects.
A control panel 1 of the present invention is mainly composed of a wooden composite board 2 and a resin sheet 3.
［コンクリート型枠用パネル］
　本発明のコンクリート型枠用パネルは、合板と木質繊維板からなる木質複合板の木質繊維板側の表面に樹脂シートが積層され、前記樹脂シート表面側におけるＪＡＳ　１０７３　摩耗Ａ試験に準拠して測定した摩耗減量（５００回転前の試験片の質量から５００回転後の試験片の質量を差分した質量）の摩耗面積の単位面積あたりの摩耗減量が１．０００ｇ／ｍ２以下であることが好ましく、０．５００ｇ／ｍ２以下であることがより好ましく、０．４００ｇ／ｍ２以下であることがさらに好ましい。前記摩耗面積の単位面積あたりの摩耗減量が１．０００ｇ／ｍ２以下であると、耐摩耗性に優れており、コンパネの樹脂シートの表面に付着が残ったコンクリートをヘラではがすなどの作業で樹脂シートの表面が傷つきにくい。そのためコンパネを繰り返し使用することが可能となる。さらに樹脂シートの表面が傷つきにくいことから、コンパネを繰り返し使用しても、仕上がった表面は平滑なコンクリートを得ることができる。
　前記耐摩耗性を示す摩耗減量は、後述する樹脂シート、接着剤及び木質繊維板によって調整することができ、特にコンパネの最表面にある樹脂シートが前記摩耗減量に調整することができる。 [Concrete Formwork Panel]
In the concrete form panel of the present invention, a resin sheet is laminated on the surface of the wood fiber board side of the wood composite board made of plywood and wood fiber board, and the surface side of the resin sheet is measured according to JAS 1073 Abrasion A test. The wear loss per unit area of the wear area of the wear loss (mass obtained by subtracting the mass of the test piece after 500 rotations from the mass of the test piece before 500 rotations) is preferably 1.000 g / m 2 or less, It is more preferably 0.500 g/m 2 or less, and even more preferably 0.400 g/m 2 or less. When the wear loss per unit area of the wear area is 1.000 g / m 2 or less, the wear resistance is excellent, and it is possible to remove the concrete remaining on the surface of the resin sheet of the control panel with a spatula. The surface of the resin sheet is hard to be damaged. Therefore, it is possible to use the control panel repeatedly. Furthermore, since the surface of the resin sheet is hard to damage, even if the concrete panel is repeatedly used, the finished surface of the concrete can be smooth.
The abrasion loss indicating the abrasion resistance can be adjusted by the resin sheet, the adhesive and the wood fiber board, which will be described later. In particular, the resin sheet on the outermost surface of the control panel can be adjusted to the abrasion loss.
　また、前記樹脂シートの表面側におけるＪＩＳ　Ｋ５６００－５－４に準拠して測定した鉛筆硬度がＨ以上であることが好ましく、２Ｈ以上であることがより好ましく、３Ｈ以上であることがさらに好ましい。前記鉛筆硬度がＨ以上であると、コンパネの樹脂シートの表面のコンクリートをヘラではがす作業をおこなっても凹みが発生しにくい。そのため、より表面の平滑な仕上がりのコンクリートを得ることができるとともに、コンパネをより多くの回数繰り返し使用することが可能である。 In addition, the pencil hardness of the surface side of the resin sheet measured according to JIS K5600-5-4 is preferably H or higher, more preferably 2H or higher, and even more preferably 3H or higher. When the pencil hardness is H or higher, even if the concrete on the surface of the resin sheet of the control panel is peeled off with a spatula, dents are less likely to occur. Therefore, it is possible to obtain a finished concrete with a smoother surface and to use the concrete panel more times.
［木質複合板］
　本発明は、木質複合板２が合板２１と木質繊維板２２とからなることを特徴とする。
　合板２１としては、シナ、カバ、セン、ブナ、ナラ、ラワン、セラヤ、メランチ、カポール、アピトン等の広葉樹合板、カラマツやエゾマツ、アカマツ、ベイマツ、ヒノキ、ヒバ、スギ、ベチツガ、スプルース、ラジアータパインなどの針葉樹合板、早成樹である、ポプラ、ファルカタ、アカシア、カメレレ、ユーカリ、ターミナリア等の植林木合板等、特に限定なく採用することができる。尚、本発明のコンパネ１では、合板２１の表面に木質繊維板２２が積層されるため、合板２１には表面平滑性が求められない。よって、環境負荷低減の面から、表面平滑性に劣る針葉樹合板や、早成樹である植林木からなる植林木合板を用いることが、望ましい。
　合板２１の厚さは特に限定されるものではないが、強度と価格の兼ね合いから２ｍｍ以上２０ｍｍ以下であることが好ましく、更に５ｍｍ以上１５ｍｍ以下であることが好ましく、特に７ｍｍ以上１２ｍｍ以下であることが好ましく、３～５プライの合板であることが好ましい。 [Wood Composite Board]
The present invention is characterized in that the wood composite board 2 is composed of a plywood 21 and a wood fiber board 22 .
As the plywood 21, broad-leaved plywood such as Japanese cypress, birch, Japanese beech, beech, oak, lauan, selaya, meranti, capol, and apiton; coniferous plywood, fast-growing plywood of planted trees such as poplar, falcata, acacia, chamelele, eucalyptus, terminalaria, etc., can be used without particular limitation. In addition, in the control panel 1 of the present invention, since the wood fiber board 22 is laminated on the surface of the plywood 21, the plywood 21 is not required to have surface smoothness. Therefore, from the viewpoint of reducing the environmental load, it is desirable to use coniferous plywood with poor surface smoothness or planted plywood made of planted trees that are fast-growing trees.
Although the thickness of the plywood 21 is not particularly limited, it is preferably 2 mm or more and 20 mm or less, more preferably 5 mm or more and 15 mm or less, and particularly 7 mm or more and 12 mm or less, in terms of strength and price. is preferred, preferably 3-5 ply plywood.
　木質繊維板２２としては、木材をチップ化して接着剤等とともに成形したパーティクルボード、木材を解繊して成形した、中密度繊維板（ＭＤＦ）、ハードボード等を特に限定なく用いることができる。しかしながら得られるコンパネ１の表面平滑性と重量を考慮すると、少なくとも後述する樹脂シート側が、１００メッシュ未満の極めて細かいチップを主成分とし、その他が０．５～１００メッシュ程度のチップを主成分とするパーティクルボードを採用することが好ましい。また、パーティクルボードの両表面層が前述した極めて細かいチップを主成分とし、その間が０．５～１００メッシュ程度のチップを主成分とするものであってもよい。当該パーティクルボードは、表面が平滑でありながら、比較的軽量である。
　木質繊維板２２の厚さは特に限定されるものではないが、厚すぎるとコンパネ１の重量の増加が大きくなり、薄すぎるとコンパネ１に十分な表面平滑性を付与することができないので、１ｍｍ以上１０ｍｍ以下、特に２ｍｍ以上６ｍｍ以下であることが好ましい。 As the wood fiber board 22, a particle board formed by chipping wood and molded with an adhesive or the like, a medium density fiber board (MDF) formed by defibrating wood, a hard board, or the like can be used without particular limitation. However, considering the surface smoothness and weight of the obtained control panel 1, at least the resin sheet side, which will be described later, is mainly composed of extremely fine chips of less than 100 mesh, and the other is mainly composed of chips of about 0.5 to 100 mesh. It is preferable to employ particle board. Moreover, both surface layers of the particle board may be composed mainly of the above-described extremely fine chips, and the chips having a size of about 0.5 to 100 mesh between them may be used as the main component. The particle board has a smooth surface and is relatively lightweight.
The thickness of the wood fiber board 22 is not particularly limited. It is preferably 2 mm or more and 6 mm or less, particularly 2 mm or more and 6 mm or less.
［樹脂シート］
　本発明の樹脂シート３は、木質複合板の木質繊維板の表面に積層され、ヘラなどに対する耐摩耗性や、
コンクリートとの離型性と表面平滑性の付与を目的に設けられている。 [Resin sheet]
The resin sheet 3 of the present invention is laminated on the surface of the wood fiber board of the wood composite board, and has wear resistance against spatula and the like,
It is provided for the purpose of releasability from concrete and imparting surface smoothness.
　本発明のコンパネ１の表面に積層される樹脂シート３１は、コンパネの状態において前記耐摩耗性の試験を満たすものであればよく、前記耐摩耗性は樹脂シートの樹脂の種類、樹脂シートの厚みや表面処理などの表面状態によって適宜調整することができる。前記樹脂シートは従来のフィルム仕上げコンパネにおいて採用されている樹脂シートを特に限定なく採用することができ、例えばポリエチレン、ポリプロピレン、エチレン・プロピレン共重合体等のポリオレフィン系樹脂、ポリエチレンテレフタレート、ポリブチレンテレフタレート等のポリエステル系樹脂、ポリスチレン系樹脂、ポリアミド系樹脂、フッ素系樹脂、塩化ビニル系樹脂等からなるシートや、メラミン樹脂やフェノール樹脂などの熱硬化性樹脂からなるシート、これらの樹脂をブレンドしたり積層したりしてなるシートを用いることができる。しかしながら、価格や、硬化後のコンクリート表面の平滑性や耐久性等を考慮すると、ポリエチレン系樹脂やポリエステル系樹脂からなるフィルムを用いることが好ましく、特にポリエチレンテレフタレートからなるフィルムを用いることが好ましい。その他、コンパネの樹脂シートの耐摩耗性を向上させる手段として、樹脂シートの表面に塗膜層を設けてもよいし、樹脂シートを架橋させてもよい。 The resin sheet 31 laminated on the surface of the control panel 1 of the present invention may satisfy the wear resistance test in the state of the control panel, and the wear resistance is the type of resin of the resin sheet, the thickness of the resin sheet It can be appropriately adjusted depending on the surface condition such as surface treatment. As the resin sheet, any resin sheet used in conventional film-finishing compound panels can be used without particular limitation. Sheets made of polyester-based resin, polystyrene-based resin, polyamide-based resin, fluorine-based resin, vinyl chloride-based resin, etc., sheets made of thermosetting resin such as melamine resin and phenolic resin, blends and laminates of these resins It is possible to use a sheet formed by However, considering the price, the smoothness and durability of the cured concrete surface, etc., it is preferable to use a film made of polyethylene resin or polyester resin, and particularly preferably a film made of polyethylene terephthalate. In addition, as means for improving the abrasion resistance of the resin sheet of the control panel, a coating film layer may be provided on the surface of the resin sheet, or the resin sheet may be crosslinked.
　また、本発明のコンパネ１の裏面の表面（合板の表面）に前記樹脂シートに用いるものを積層することがより好ましい。これにより水によるコンパネの膨らみを防ぐことができる。このとき採用されるものは、表面及び裏面共に同じ樹脂シートであってもいいし、異なる樹脂シートであってもよい。
　樹脂シート３１の厚さは、コンパネを繰り返し使用することから、耐摩耗性と価格との兼ね合いから、１０μｍ以上４００μｍ以下であることが好ましく、特に２０μｍ以上１００μｍ以下であることが好ましく、さらには２０μｍ以上４０μｍ以下であることが好ましい。 Moreover, it is more preferable to laminate the material used for the resin sheet on the surface of the back surface (the surface of the plywood) of the control panel 1 of the present invention. This prevents the control panel from swelling due to water. At this time, the same resin sheet may be used for both the front surface and the back surface, or different resin sheets may be used.
The thickness of the resin sheet 31 is preferably 10 μm or more and 400 μm or less, particularly preferably 20 μm or more and 100 μm or less, further preferably 20 μm, from the viewpoint of the balance between wear resistance and price because the compound panel is repeatedly used. It is preferable that the thickness is not less than 40 μm and not more than 40 μm.
　また後述するように、樹脂シート３１は接着剤４を介して、木質複合板２の木質繊維板２２に積層される。よって、樹脂シート３１は、接着剤４が塗布される面の濡れ性が調整されていることが好ましい。詳しくは、コロナ放電処理やプラズマ処理などによって、その表面の濡れ指数が４０～６０ｍＮ／ｍ、さらには４５～５５ｍＮ／ｍなるように調整されていることが好ましい。濡れ指数が４０ｍＮ／ｍ未満であると、樹脂シート３１が木質繊維板２２から剥離する恐れが生じる。
また樹脂シートの接着剤が塗布される面には易接着層が設けられてもよいし、さらにコロナ放電処理に加えて易接着層が設けられてもよい。 As will be described later, the resin sheet 31 is laminated on the wood fiber board 22 of the wood composite board 2 via the adhesive 4 . Therefore, the wettability of the surface of the resin sheet 31 to which the adhesive 4 is applied is preferably adjusted. More specifically, it is preferable that the surface wetting index is adjusted to 40 to 60 mN/m, more preferably 45 to 55 mN/m, by corona discharge treatment, plasma treatment, or the like. If the wetness index is less than 40 mN/m, the resin sheet 31 may peel off from the wood fiber board 22 .
Further, an easy-adhesion layer may be provided on the surface of the resin sheet to which the adhesive is applied, or an easy-adhesion layer may be provided in addition to the corona discharge treatment.
　尚、樹脂シート３１は、接着剤４が塗布される面のみ濡れ性が調整されていて、その反対側の面は調整されていないことが望ましい。具体的には、樹脂シートにおいて木質繊維板側とは反対の面の濡れ指数が４０ｍＮ／ｍ未満であることが望ましい。樹脂シートにおいて、木質繊維板側とは反対側の面は、コンクリートと直接接することになるが、当該面の濡れ指数が高いと、コンクリートが硬化した後にコンパネ１を剥がすことが難しくなる。 It is desirable that the wettability of the resin sheet 31 is adjusted only on the surface to which the adhesive 4 is applied, and not adjusted on the opposite surface. Specifically, it is desirable that the surface of the resin sheet opposite to the wood fiber board has a wettability index of less than 40 mN/m. The surface of the resin sheet opposite to the wood fiber board side comes into direct contact with the concrete, but if the wettability index of this surface is high, it becomes difficult to peel off the concrete panel 1 after the concrete hardens.
　樹脂シート３１の片面のみ濡れ性を調整するには、例えば、合成樹脂をインフレーション押出成形法にて円筒状に押し出し、これをニップロール等で扁平に折り畳んだ状態でコロナ放電処理やプラズマ処理などを施せばよい。扁平に折り畳まれた状態で処理することにより、扁平なチューブ状フィルムの内面には処理が施されず、外面のみ処理が施されることになる。最後に扁平なチューブ状フィルムの両側端をカットして二枚のフィルムとすれば、片面のみ濡れ性が調整された樹脂シート３を得ることができる。 In order to adjust the wettability of only one side of the resin sheet 31, for example, a synthetic resin is extruded into a cylindrical shape by an inflation extrusion method, and this is flattened with a nip roll or the like and subjected to a corona discharge treatment or a plasma treatment. Just do it. By treating the flat folded film, the inner surface of the flat tubular film is not treated, and only the outer surface is treated. Finally, by cutting both ends of the flat tubular film into two films, it is possible to obtain the resin sheet 3 whose wettability is adjusted only on one side.
　木質繊維板２２と樹脂シート３１の貼合に用いられる接着剤や、合板２１と木質繊維板２２との貼合に用いられる接着剤は、従来用いられているものを、特に限定なく用いることができる。例えば、エチレン酢酸ビニル樹脂接着剤、ポリ酢酸ビニル樹脂接着剤、エポキシ樹脂接着剤、ウレタン樹脂接着剤、アクリル樹脂接着剤、ホットメルト接着剤及び感圧性接着剤などを樹脂シートの種類に応じて適宜選択して用いることができる。 As the adhesive used for laminating the wood fiber board 22 and the resin sheet 31 and the adhesive used for laminating the plywood 21 and the wood fiber board 22, conventionally used adhesives can be used without particular limitation. can. For example, ethylene vinyl acetate resin adhesives, polyvinyl acetate resin adhesives, epoxy resin adhesives, urethane resin adhesives, acrylic resin adhesives, hot-melt adhesives, pressure-sensitive adhesives, etc. are used as appropriate depending on the type of resin sheet. It can be selected and used.
［コンクリート型枠用パネルの製造方法］
　本発明のコンクリート型枠用パネル１は、例えば、樹脂シートの一方の面に接着剤を塗布し、該塗布面に木質繊維版２２を貼合したのちに、該目次２の他方の面に接着剤を塗布し、該塗布面に合板２１を貼合することにより製造することができる。または木質繊維板２２の一方の面に接着剤を塗布し、該塗布面に樹脂シート３１を貼合したのち、該木質繊維板２２の他方の面に接着剤を塗布し、該塗布面に合板２１を貼合することにより製造することができる。 [Manufacturing method of panel for concrete formwork]
For example, the panel for concrete formwork 1 of the present invention is obtained by applying an adhesive to one surface of a resin sheet, bonding a wood fiber board 22 to the coated surface, and then bonding it to the other surface of the table of contents 2. It can be manufactured by applying the agent and laminating the plywood 21 on the applied surface. Alternatively, after applying an adhesive to one surface of the wood fiber board 22 and bonding the resin sheet 31 to the applied surface, the adhesive is applied to the other surface of the wood fiber board 22, and the applied surface is plywood. 21 can be laminated together.
　コンクリート型枠用パネルの評価は以下の方法により行った。
［耐摩耗性］
　実施例・比較例のコンクリート型枠用パネルから直径約１２０ｍｍの円板状の試験片を作成し、試験片の中央に直径１０ｍｍの穴をあける。ＪＡＳ　１０７３　摩耗Ａ試験（荷重５００ｇ、摩耗面積約０．３０４３ｍ２（外径９０ｍｍ、内径６５ｍｍのドーナツ円））に準拠し、試験片の樹脂シート側または塗膜層側に研磨紙が接するように設置して、試験片を５００回転させた後に、５００回転前（試験前）の試験片の質量と５００回転後の試験片の質量の差分から摩耗減量を算出し、また摩耗面積の単位面積あたりの摩耗減量を算出した。摩耗面積の単位面積あたりの摩耗減量が１．０００ｇ／ｍ２以下のものを○、１．０００ｇ／ｍ２より大きいものを×と評する。 Evaluation of concrete formwork panels was carried out by the following methods.
[Abrasion resistance]
A disc-shaped test piece having a diameter of about 120 mm is prepared from the concrete formwork panel of the example and comparative example, and a hole having a diameter of 10 mm is made in the center of the test piece. In accordance with JAS 1073 Abrasion A test (500 g load, wear area of about 0.3043 m 2 (outer diameter 90 mm, inner diameter 65 mm donut circle)), the abrasive paper is in contact with the resin sheet side or the coating layer side of the test piece. After installing and rotating the test piece 500 times, calculate the abrasion loss from the difference between the mass of the test piece before 500 rotations (before the test) and the mass of the test piece after 500 rotations, and also per unit area of the worn area was calculated. When the wear loss per unit area of the worn area is 1.000 g/m 2 or less, it is evaluated as ○, and when it is more than 1.000 g/m 2 , it is evaluated as x.
［コインスクラッチ試験］
　実施例・比較例のコンクリート型枠用パネルを試験片として用いて、十円硬貨を荷重１．０ｋｇかけて４５°の角度で傾けた状態で樹脂シートまたは塗膜層の表面に当て、十円硬貨を傾けた方向へスクラッチする。各スクラッチ回数において表面シートに傷が発生しているが、木質複合板は露出していないものを○、表面シートに傷が発生しており、部分的に木質複合板が露出しているものを△、表面シートがなくなり、木質複合板が露出しているものを×と評する。 [Coin scratch test]
Using the concrete formwork panels of Examples and Comparative Examples as test pieces, a 10-yen coin is applied to the surface of the resin sheet or coating layer with a load of 1.0 kg and tilted at an angle of 45 °. Scratch in the direction in which the coin is tilted. For each number of scratches, the surface sheet was scratched, but the wood composite board was not exposed. △, the case where the surface sheet disappeared and the wooden composite board was exposed was evaluated as ×.
［鉛筆硬度］
　実施例・比較例のコンクリート型枠用パネルを試験片として用いて、樹脂シート側または塗膜層側におけるの表面の鉛筆硬度を、ＪＩＳ　Ｋ５６００－５－４（試験条件：荷重５００ｇ、速度：１００ｍｍ／１５ｓ）に準拠して測定する。 [Pencil hardness]
Using the concrete formwork panels of Examples and Comparative Examples as test pieces, the pencil hardness of the surface on the resin sheet side or the coating layer side was measured according to JIS K5600-5-4 (test conditions: load 500 g, speed: 100 mm /15s).
［コンクリートの光沢性］
　実施例・比較例のコンクリート型枠用パネルを用いて、コンクリートを打設し、硬化後にコンクリートを脱型した後に、コンクリートの表面の光沢性を目視にて確認する。コンクリートの表面の光沢があるものをあり、光沢がないものをなしと評する。 [Glossiness of concrete]
Concrete is placed using the concrete formwork panels of Examples and Comparative Examples, and after the concrete is demolded after hardening, the glossiness of the surface of the concrete is visually confirmed. If the surface of the concrete is glossy, it is evaluated as "Yes", and if it is not glossy, it is evaluated as "None".
［実施例１］
　樹脂シートとして片面のみコロナ放電処理がされた厚さ１２μｍの易接着層付きのポリエチレンテレフタレートフィルム（以下、「ＰＥＴ」と称す）を用意し、該フィルムのコロナ放電処理面にエチレン－酢酸ビニル共重合体からなる接着剤を塗布する。次いで、接着剤を塗布した面に、厚さ３ｍｍのパーティクルボード（以下、「ＰＢ」と称す）を積層する。次いで、該ＰＢの表面にエチレン－酢酸ビニル系接着剤を塗布し、ヒノキ合板（５プライ、９ｍｍ）を積層してコンクリート型枠用パネルを製造した。 [Example 1]
A polyethylene terephthalate film (hereinafter referred to as “PET”) with an easily adhesive layer having a thickness of 12 μm and having only one side subjected to corona discharge treatment was prepared as a resin sheet. Apply glue consisting of coalescence. Next, a particle board (hereinafter referred to as “PB”) having a thickness of 3 mm is laminated on the surface to which the adhesive is applied. Next, an ethylene-vinyl acetate adhesive was applied to the surface of the PB, and cypress plywood (5 plies, 9 mm) was laminated to produce a panel for concrete formwork.
［実施例２］
　樹脂シートとして片面のみ易接着層を設けた厚さ２５μｍのＰＥＴを用いた以外は、実施例１と同様にしてコンクリート型枠用パネルを製造した。
［実施例３］
　樹脂シートとして片面のみ易接着層を設けた厚さ３８μｍのＰＥＴを採用した以外は、実施例１と同様にして、コンクリート型枠用パネルを製造した。 [Example 2]
A panel for concrete formwork was produced in the same manner as in Example 1, except that a 25 μm thick PET having an easy-adhesion layer provided only on one side was used as the resin sheet.
[Example 3]
A panel for concrete formwork was produced in the same manner as in Example 1, except that PET having a thickness of 38 μm having an easy-adhesion layer provided only on one side was used as the resin sheet.
［実施例４］
　樹脂シートとして片面のみコロナ放電処理を施した厚さ４０μｍの高密度ポリエチレンフィルム（以下、「ＨＤＰＥ」と称す）を採用した以外は、実施例１と同様にして、コンクリート型枠用パネルを製造した。
［実施例５］
　樹脂シートとして片面のみコロナ放電処理を施した厚さ２０μｍのＨＤＰＥを採用した以外は、実施例１と同様にして、コンクリート型枠用パネルを製造した。 [Example 4]
A panel for concrete formwork was produced in the same manner as in Example 1, except that a 40 μm-thick high-density polyethylene film (hereinafter referred to as “HDPE”) that had been subjected to corona discharge treatment on only one side was used as the resin sheet. .
[Example 5]
A panel for concrete formwork was produced in the same manner as in Example 1, except that a 20 μm-thick HDPE having only one surface subjected to corona discharge treatment was used as the resin sheet.
［実施例６］
　樹脂シートとして片面のみコロナ放電処理を施した厚さ４０μｍのポリエチレン系樹脂多層フィルム（直鎖状低密度ポリエチレン／高密度ポリエチレン／直鎖状低密度ポリエチレン）（以下、「ＬＬ／ＨＤ／ＬＬ」と称す）を採用した以外は、実施例１と同様にして、コンクリート型枠用パネルを製造した。
［実施例７］
　樹脂シートとして片面のみコロナ放電処理を施した厚さ１２μｍのポリブチレンテレフタレートフィルム（以下、「ＰＢＴ」と称す）を採用した以外は、実施例１と同様にして、コンクリート型枠用パネルを製造した。 [Example 6]
A 40 μm-thick polyethylene-based resin multilayer film (linear low-density polyethylene/high-density polyethylene/linear low-density polyethylene) (hereinafter referred to as “LL/HD/LL”) having a thickness of 40 μm and having only one surface subjected to corona discharge treatment as a resin sheet. A panel for concrete formwork was manufactured in the same manner as in Example 1, except that the above was adopted.
[Example 7]
A panel for concrete formwork was produced in the same manner as in Example 1, except that a 12 μm-thick polybutylene terephthalate film (hereinafter referred to as “PBT”) that had been subjected to corona discharge treatment on only one side was used as the resin sheet. .
［比較例１］
　市販品である、カラマツとラーチからなる合板（５プライ、１２ｍｍ）の表面にウレタン系樹脂を塗布して塗膜層を設けたコンクリート型枠用パネル（ドルフィンコート株式会社製）を用いた。 [Comparative Example 1]
A commercially available panel for concrete formwork (manufactured by Dolphin Coat Co., Ltd.) was used, in which a coating layer was provided by applying a urethane resin to the surface of plywood (5 plies, 12 mm) made of larch and larch.
［比較例２］
　市販品である、ラワン材からなる合板（５プライ、１２ｍｍ）の表面にウレタン系樹脂を塗布して塗膜層を設けたコンクリート型枠用パネル（シンヤンプライウッド株式会社製）を用いた。 [Comparative Example 2]
A commercially available panel for concrete formwork (manufactured by Shin Yang Plywood Co., Ltd.) was used, in which a coating film layer was provided by applying a urethane resin to the surface of plywood (5 ply, 12 mm) made of lauan material.
［比較例３］
　市販品である、ラワン材からなる合板（５プライ、１２ｍｍ）の表面にウレタン系樹脂を塗布した塗膜層を設けたコンクリート型枠用パネル（東洋テックス株式会社製）を用いた。 [Comparative Example 3]
A commercially available panel for concrete formwork (manufactured by Toyo Tex Co., Ltd.) was used, in which a coating layer of urethane-based resin was applied to the surface of plywood (5 ply, 12 mm) made of lauan material.
［比較例４］
　市販品である、ラワン材からなる合板（５プライ、１２ｍｍ）の表面にウレタン系樹脂を塗布した塗膜層を設けたコンクリート型枠用パネル（コリンドグループ社製）を用いた。 [Comparative Example 4]
A commercially available panel for concrete formwork (manufactured by Korindo Group Co., Ltd.) was used, in which a coating layer of urethane-based resin was applied to the surface of plywood (5 plies, 12 mm) made of lauan material.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　各種樹脂シートをエチレン－酢酸ビニル系接着剤を介して木質繊維板であるパーティクルボードを積層した実施例１～７のコンパネは、コンクリートを脱型した後に、コンパネの表面に残るコンクリートをヘラでこそぎ取るときに、樹脂シートが傷つくことがなく、または傷がつくことが少なくコンクリートを剥離することができ、繰り返し使用することができた。中でも、実施例１～３の樹脂シートにＰＥＴを用いたコンパネはコンクリートをこそぎ取るときに樹脂シートが傷つくことなく、また樹脂シートの表面が凹まなかった。そのため、複数回と繰り返し使用しても表面が平滑な仕上がりのコンクリートを得ることができた。さらには仕上がったコンクリートの表面を確認すると、光沢性があるものであり優れているものであった。
　比較例１～４の合板の表面に塗膜層を設けたコンパネは、耐摩耗性を満足するものではなかったため、コンクリートを脱型した後に、コンパネの表面に残るコンクリートをヘラでこそぎ取るときに塗装層の表面が傷ついた。再度コンパネを用いると表面が傷ついたあるいは表面がへこんだ仕上がりのコンクリートであった。 The concrete panels of Examples 1 to 7, in which various resin sheets are laminated with a particle board that is a wood fiber board via an ethylene-vinyl acetate adhesive, are removed from the surface of the concrete panel with a spatula after the concrete is demolded. When stripped, the resin sheet was not damaged, or the concrete could be peeled off with less damage, and could be used repeatedly. Among them, the concrete panels using PET as the resin sheet of Examples 1 to 3 did not damage the resin sheet when the concrete was scraped off, and the surface of the resin sheet did not dent. Therefore, it was possible to obtain a finished concrete with a smooth surface even after repeated use. Furthermore, when the surface of the finished concrete was confirmed, it was glossy and excellent.
The concrete panels provided with a coating layer on the surface of the plywood of Comparative Examples 1 to 4 did not satisfy wear resistance, so after removing the concrete, when scraping off the concrete remaining on the surface of the concrete panel with a spatula. The surface of the coating layer was damaged. When the concrete panel was used again, the finished concrete was damaged or dented.
１　　　　　コンクリート型枠用パネル（コンパネ）
２　　　　　木質複合板
２１　　　　合板
２２　　　　木質繊維板
３　　　　　樹脂シート
４　　　　　接着剤
 

  1 Concrete Formwork Panel (Compane)
2 Wood composite board 21 Plywood 22 Wood fiber board 3 Resin sheet 4 Adhesive

Claims (4)

  1. 　合板と木質繊維板からなる木質複合板の木質繊維板側の表面に樹脂シートが積層されたコンクリート型枠用パネルにおいて、
    　前記樹脂シート表面側におけるＪＡＳ　１０７３　摩耗Ａ試験に準拠して測定した摩耗減量（５００回転前の試験片の質量から５００回転後の試験片の質量を差分した質量）の摩耗面積の単位面積あたりの摩耗減量が１．０００ｇ／ｍ２以下であることを特徴とするコンクリート型枠用パネル。     A concrete formwork panel in which a resin sheet is laminated on the surface of a wood composite board made of plywood and wood fiber board on the wood fiber board side,
    Wear loss (mass obtained by subtracting the mass of the test piece after 500 rotations from the mass of the test piece before 500 rotations) measured in accordance with the JAS 1073 abrasion A test on the surface side of the resin sheet per unit area of the worn area A panel for concrete formwork, characterized by having an abrasion loss of 1.000 g/m 2 or less.
  2. 　前記摩耗面積の単位面積あたりの摩耗減量が０．４００ｇ／ｍ２以下であることを特徴とする請求項１記載のコンクリート型枠用パネル。 2. The panel for concrete formwork according to claim 1, wherein the wear loss per unit area of the worn area is 0.400 g/m <2> or less.
  3. 　前記樹脂シートの表面側におけるＪＩＳ　Ｋ５６００－５－４に準拠して測定した鉛筆硬度がＨ以上であることを特徴とする請求項１または２記載のコンクリート型枠用パネル。 The panel for concrete formwork according to claim 1 or 2, characterized in that the surface side of the resin sheet has a pencil hardness of H or more measured according to JIS K5600-5-4.
  4. 　前記木質繊維板がパーティクルボードまたは中密度繊維板であることを特徴とする請求項１乃至３記載いずれかに記載のコンクリート型枠用パネル。

          4. The panel for concrete formwork according to any one of claims 1 to 3, wherein the wood fiber board is a particle board or a medium density fiber board.
PCT/JP2022/029886 2021-08-07 2022-08-04 Panel for concrete formwork WO2023017770A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60184166A (en) * 1984-03-02 1985-09-19 アイン・エンジニアリング株式会社 Weir plate for concrete casting frame
JPH08192419A (en) * 1995-01-20 1996-07-30 Sakushin Kogyo Kk Panel for concrete casting form
JPH11129211A (en) * 1997-10-27 1999-05-18 Shinakimoku Kogyo Kk Coated composite plywood for form and manufacture thereof
WO2008155244A2 (en) * 2007-06-20 2008-12-24 Ilpa S.R.L. Industria Legno Pasotti S.R.L. Panel for making poured concrete forms or the like
WO2016047500A1 (en) * 2014-09-25 2016-03-31 東洋アルミニウム株式会社 Framework for concrete forming, concrete formed body formed by same, concrete structure using concrete formed body, method for producing concrete formed body, and method for producing concrete structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60184166A (en) * 1984-03-02 1985-09-19 アイン・エンジニアリング株式会社 Weir plate for concrete casting frame
JPH08192419A (en) * 1995-01-20 1996-07-30 Sakushin Kogyo Kk Panel for concrete casting form
JPH11129211A (en) * 1997-10-27 1999-05-18 Shinakimoku Kogyo Kk Coated composite plywood for form and manufacture thereof
WO2008155244A2 (en) * 2007-06-20 2008-12-24 Ilpa S.R.L. Industria Legno Pasotti S.R.L. Panel for making poured concrete forms or the like
WO2016047500A1 (en) * 2014-09-25 2016-03-31 東洋アルミニウム株式会社 Framework for concrete forming, concrete formed body formed by same, concrete structure using concrete formed body, method for producing concrete formed body, and method for producing concrete structure

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