【０００１】
【発明の属する技術分野】
本発明は、隣り合わせる長尺金属板の連結部同士を連結して金属屋根を構築する際に、前記連結部（いわゆるハゼ）に挟着されて該連結部に防水性を付与する金属屋根用防水部材に関する。
【０００２】
【従来の技術】
従来から、例えば特許文献１、特許文献２に開示されるような、立平式長尺金属屋根や瓦棒式長尺金属屋根を構築する際に用いられる、略丸棒形状又は略角棒形状の防水部材が知られている。
これら防水部材は、隣り合わせる長尺金属板の連結部同士をカシメ固定により連結して金属屋根を構築する際に、前記連結部に挟着されて、前記長尺金属板の連結部分に防水性を付与するようになっている。
【０００３】
【特許文献１】
実開平１−１０７７３４号公報
【特許文献２】
特開平７−２３３５９４号公報
【０００４】
また、近年では、防水部材の製造コストの低減や、長尺金属板の連結部への貼着け作業の簡素化等を目的として、テープ基材の両面に粘着剤層を設けた三層構造の両面接着型防水テープも市販されている。
【０００５】
【発明が解決しようとする課題】
前記したような防水テープは、基材両面に粘着剤層を積層形成すれば良いから低コストで製造でき、また、テープ状のため、長尺金属板の連結部へ容易に貼着けることができるなどの利点を有するものの、テープ厚が薄いため、カシメ固定により連結される長尺金属板の連結部（ハゼ）に対する充填が充分になされず、経年により前記連結部に隙間が生じ、防水性が低下する虞れがあった。
【０００６】
このような問題を解消するために、前記テープ基材として所定の厚みをもった発泡体を用いることも考えられるが、その場合、テープが伸び易くなるため、長尺金属板の連結部に貼り着ける際のテープの伸びにより部分的な薄肉部分が発生し、その薄肉部分において、経年により防水性が低下する虞れがあった。
このような問題は、長尺金属板の連結作業を専用の装置により自動的に行う場合、特に顕著に発生する虞れがある。すなわち、渦巻状に巻回してなる防水テープを引き出して長尺金属板の連結部に貼り着ける作業や連結部同士をカシメ固定する作業を専用の装置で行う場合、テープ引出し力の調整が困難であってテープが必要以上に伸び前記薄肉部分が発生して防水性が低下し、さらにはテープが切断する虞れもある。
【０００７】
本発明はこのような従来事情に鑑みてなされたもので、その目的とする処は、発泡体からなる基材両面に粘着剤層を設けた積層テープ構造で、長尺金属板に貼り着ける際に必要以上に伸びる虞れがなく、長期の防水性にも優れ、専用装置による長尺金属板への自動貼り着け作業，自動カシメ作業にも適した、新規な金属屋根用防水部材を提供することにある。
【０００８】
【課題を解決するための手段】
以上の目的を達成するために本願発明者等は鋭意研究を重ねた結果、発泡体からなる基材両面に粘着剤層を設けた積層テープを基本構成とし、且つ、伸縮性を備えない材料を備えることで、前述の課題を達成し得ることを知見し、本発明を完成するに至った。
すなわち本発明は、隣り合わせる長尺金属板の連結部同士を連結して金属屋根を構築する際に、前記連結部に挟着されて該連結部に防水性を付与する金属屋根用防水部材であって、
発泡体からなるテープ状基材の表裏両面に粘着剤層を設け、且つ可撓性を有するが伸縮性は備えない伸縮規制材からなる層を内在してなることを特徴とする金属屋根用防水部材である。
【０００９】
このような構成とした本発明の金属屋根用防水部材は、発泡体からなるテープ状基材両面に粘着剤層を設けた積層テープ構造のため、該防水部材を貼り着けた長尺金属板の連結部同士をカシメ固定して連結する際、前記発泡体が圧縮されてその復元力により長尺金属板の連結部に隙間が生じることなく挟着、充填され、長期にわたって高い防水性を維持することができる。また、可撓性を有するが伸縮性は備えない伸縮規制材からなる層を内部に積層してなるので、前記連結部へ貼り着ける際に、発泡体からなるテープ状基材や粘着層が必要以上に伸びることがなく、前記防水性が低下するような虞れはない。
よって、専用装置による長尺金属板への自動貼り着け，自動カシメ作業にも適した防水部材とすることができた。
【００１０】
本発明で用いる伸縮規制材としては、綿，スフ，ポリエチレン，ポリプロピレン等の天然繊維や合成繊維からなる織布や不織布、若しくはポリエチレン，ポリプロピレン等の合成樹脂からなるフィルムなどを挙げることができ、この中でも、合成繊維が間隔をあけて縦方向、横方向に並列され、繊維の交差部が接合されることにより多数の開口部が形成されてなる不織布、例えばワリフ等を好ましく用いることができる。
【００１１】
また、伸縮規制材からなる層の積層形態としては、前記テープ状基材と粘着剤層の間に積層形成する態様、前記粘着剤層の厚み内に積層形成する態様をあげることができる。
【００１２】
伸縮規制材からなる層をテープ状基材と粘着剤層の間に積層形成する態様において、開口部を備えない布地状又はフィルム状の伸縮規制材を用いる場合は、その伸縮規制材を加熱圧着又は接着剤等によりテープ状基材表面に積層する。伸縮規制材として多数の開口部を有する不織布（例えばワリフ）を用いる場合は、粘着剤がその開口部を通って基材と一体的に接合するので、接着剤等を用いる必要はない。
【００１３】
伸縮規制材からなる層を粘着剤層の厚み内に積層形成する態様においては、開口部を備えない布地状又はフィルム状の伸縮規制材を用いる場合、多数の開口部を有する不織布（例えばワリフ）を用いる場合の双方において、粘着剤同士が伸縮規制材と一体的に接合するので、接着剤等を用いる必要はない。
【００１４】
この中で、製造コストや積層された各層の剥離に対する強度等を考慮すれば、多数の開口部を有する伸縮規制材からなる層が、テープ状基材と粘着剤層の間に積層形成されている態様若しくは粘着剤層の厚み内に積層形成されている態様を、好ましい態様としてあげることができる。
【００１５】
本発明で用いるテープ状基材としては、ポリエチレン系，ポリウレタン系，塩化ビニル系等の合成樹脂系発泡体や、天然ゴム系，合成ゴム系等の各種発泡体を用いることができる。これらの中で、製造コストや可撓性、機械的強度、復元性、独立発泡であることによる防水性等を考慮すれば、ポリエチレン系樹脂発泡体を好ましく用いることができる。
【００１６】
本発明で用いる粘着剤層としては、合成樹脂系、ゴム系等の各種粘着剤を用いることができる。これらの中で、製造コスト、防水性、テープ状基材に対する積層形成の容易性等を考慮すれば、ブチルゴム系の粘着剤を好ましく用いることができる。
【００１７】
本発明の防水部材は、前記テープ状基材の厚みを防水部材全体の厚みの２５％以上とし、該テープ状基材の両面に設ける粘着剤層における一方の粘着剤層の表面に離型紙を貼り着けた状態で、渦巻状に巻回して使用に供することが好ましい。
このように形成した巻回状防水部材は、離型紙が貼られていない露呈面となる両側面における粘着剤層の割合が、防水部材全体の面積の７５％未満となるので、該両側面における粘着力が小さくなり、複数個の巻回状防水部材を積み重ねた状態でのブロッキング性が低くなる。
【００１８】
すなわち、この種防水部材は通常、渦巻状に巻回した状態で製品化され、金属屋根の施工現場においては、前記露呈面となる両側面が上下に位置する状態で、複数個の巻回状防水部材を積み重ねて用意される。この時、前記テープ状基材の厚みが防水部材全体の厚みの２５％未満であると、各巻回状防水部材における離型紙が貼られていない露呈面の接着剤層の割合が大きくなるので、該両側面における粘着力が大きくなる結果、複数個の巻回状防水部材を積み重ねた状態でのブロッキング性が高くなり、取り扱いが面倒になるという不具合を生じる。
本発明では前記したように、複数個の巻回状防水部材を積み重ねてもブロッキング性が低いことから、一番上の巻回状防水部材を簡単に取り上げることができ、施工現場等における取り扱いが容易になる。
【００１９】
【発明の実施の形態】
以下、実施形態の例を図面を参照して説明する。
図１〜図２に示す金属屋根用防水部材（以下、単に「防水部材」と称する）Ａは、ポリエチレン系樹脂発泡体からなるテープ状基材１の表裏両面に、ブチルゴム系粘着剤からなる粘着剤層２，３を設け、且つ可撓性を有するが伸縮性は備えない伸縮規制材からなる層４を、テープ状基材１と粘着剤層２の間に積層して、厚さ０．６〜６ｍｍ程度、幅５〜３０ｍｍ程度のテープ状に形成されており、さらに一方の粘着剤層２の表面に離型紙５を貼り着けて、渦巻状に巻回してなるものである。
【００２０】
テープ状基材１を形成するポリエチレン系樹脂発泡体は粘着テープの基材形成用として公知のもので、所望の可撓性，機械的強度，耐久性，防水性等を備えており、本例では、厚さ０．５〜２ｍｍ程度のテープ状に形成され、防水部材Ａを貼り着けた長尺金属板の連結部同士をカシメ固定して連結した際に圧縮されてその復元力により前記連結部に隙間が生じることなく挟着、充填され、長期にわたって高い防水性を発揮するようになっている。
【００２１】
粘着剤層２，３は、粘着テープの粘着層形成用として公知のブチルゴムを主成分とする粘着剤を、テープ状基材１の表裏両面に夫々厚さ０．０５〜１ｍｍ程度に積層してなり、防水部材Ａを長尺金属板の連結部に貼り着けるに際し、その貼り着け位置を修正可能な適度の粘着力を発揮するよう形成されている。
【００２２】
伸縮規制材からなる層４は、ポリエチレンやポリプロピレンなどの合成繊維が間隔をあけて縦方向、横方向に並列され、繊維の交差部が接合されることにより多数の開口部４ａが形成されて網目状となった厚さ０．０３〜０．３ｍｍ程度の経緯直交不織布（例えば、日石プラスチック社製の「日石ワリフ」等）からなり、その経緯直交不織布をテープ状基材１の表裏いずれか一方の面に積層し、その表面に粘着剤層２を積層形成して該粘着剤層２を形成する粘着剤が前記開口部４ａを通りテープ状基材１と粘着一体化することで、テープ状基材１と粘着剤層２の間に積層され、防水部材Ａの可撓性は阻害しないがその伸びを規制するよう形成されている。
【００２３】
開口部４ａの開口面積が小さく、テープ状基材１、伸縮規制材からなる層４、粘着剤層２の各層の剥離に対する強度に懸念がある場合は、前記経緯直交不織布をテープ状基材１の表裏いずれか一方の面に接着剤等で貼り着けて積層し、その表面に粘着剤層２を積層形成すると良い。
【００２４】
離型紙５は表裏両面にシリコンが塗布された周知の部材で、一方の粘着剤層２に対し容易に剥離し得るよう貼り着けられると共に、渦巻状に巻回した防水部材Ａの他方の粘着剤層３に対し容易に剥離し得るよう接触している。
【００２５】
以上のようにして、粘着剤層２／伸縮規制材（経緯直交不織布）からなる層４／テープ状基材１／粘着剤層３の四層構造になる本例の防水部材Ａは、渦巻状に巻回された状態から必要長さだけ引き出され、離型紙５を剥して、連結する長尺金属板同士の一方の連結部に貼り着けられる。この時、伸縮規制材からなる層４が、テープ状基材１や粘着層２，３が必要以上に伸びることを防止するので、この貼り着け作業を専用の装置で自動的に行っても、テープ状基材１に部分的な薄肉箇所が生じたり切断したりするようなことなく、所定厚の防水部材Ａを前記連結部の全長にわたって貼り着けることができる。
貼り着けが完了した後、長尺金属板の連結部同士をカシメ固定して連結を行うが、この時、図３に示すように、テープ状基材１が圧縮されてその復元力により長尺金属板１０１，１０２の連結部１０３，１０４間に隙間が生じることなく挟着、充填され、該連結部分に長期にわたって高い防水性を付与させることができる。
なお、図３では、金属屋根を構築する長尺金属板の連結形状として一般的な立平式の連結形状を示したが、本発明の防水部材は、瓦棒式，蟻掛け式，丸ハゼ式などの、各種連結形状に対応可能である。
【００２６】
図４には、上述した防水部材Ａにおける伸縮規制材からなる層４を、粘着剤層２の厚み内に積層形成した防水部材Ａ’を示す。
すなわちこの防水部材Ａ’は、前記テープ状基材１の表裏いずれか一方の面に、粘着剤層２ａと、該粘着剤層２ａの表面に形成される伸縮規制材からなる層４と、該伸縮規制材からなる層４の表面に形成される粘着剤層２ｂとを積層形成したものである。
【００２７】
そうして、この防水部材Ａ’は、粘着剤層２ａがテープ状基材１に粘着一体化すると共に、粘着剤が前記経緯直交不織布の開口部４ａを通り粘着剤層２ａ，２ｂが相互に粘着一体化して、粘着剤層２ｂ／伸縮規制材（経緯直交不織布）からなる層４／粘着剤層２ａ／テープ状基材１／粘着剤層３の五層構造となり、伸縮規制材からなる層４が防水部材Ａの伸びを規制して、前述の防水部材Ａと同様の効果を得ることができる。
また、粘着剤層２ａ，２ｂが前記経緯直交不織布の開口部４ａを通り相互に粘着するので、接着剤等を別途用いることなく、伸縮規制材からなる層４を積層一体化することができる。
【００２８】
【実施例】
ポリエチレン系樹脂発泡体からなるテープ状基材として、積水化学工業株式会社製のボラーラＩＦ０８００８（厚さ０．８ｍｍ）の表裏両面にコロナ処理したものを用い、そのテープ状基材の表裏両面に、ブチルゴム系粘着剤からなる粘着剤層をそれぞれ０．５ｍｍの厚さで設け、且つ伸縮規制材として経緯直交不織布（ワリフ）を用いて、一方の粘着剤層の厚み内に伸縮規制材からなる層を形成し、幅８ｍｍのテープ状とした本発明の防水部材のサンプル１と、ポリエチレン系樹脂発泡体からなるテープ状基材の表裏両面にブチルゴム系粘着剤からなる粘着剤層を設け、伸縮規制材からなる層を形成しない幅８ｍｍのテープ状とした比較サンプル２を形成した。
【００２９】
これらサンプル１，２に対し、標線間距離１２．５ｍｍ、引っ張り強度３００ｍｍ／ｍｉｎで引張り試験を行い、破断強度、破断時の伸び、２０Ｎ荷重時の伸びを測定した。結果を表１に示す。
【００３０】
【表１】
【００３１】
また、本発明の防水部材のサンプルとして、前記サンプル１における伸縮規制材からなる層を、前記テープ状基材と一方の粘着剤層との間に形成したサンプルを作成し、このサンプルにおいて同じ測定を行ったところ、サンプル１と同様の結果が得られた。
以上の測定結果から、本発明に係る防水部材が、破断強度に優れると共に、必要以上の伸びが発生せず、よって、専用の装置を用いた長尺金属板の連結作業に有用であることが確認できた。
【００３２】
以上、本発明の実施形態の一例を図面等を参照して説明したが、本発明に係る金属屋根用防水部材は上述のものに限られず、特許請求範囲の各請求項に記載された技術的思想の範疇において、種々の変更が可能であることは言うまでもない。
【００３３】
【発明の効果】
本発明に係る金属屋根用防水部材は以上説明したように構成したので、下記の効果を奏する。
【００３４】
発泡体からなるテープ状基材が、長尺金属板の連結部に圧縮状に挟着され、その復元力により前記連結部に隙間無く充填されるので、長尺金属板の連結部分に長期にわたって高い防水性を付与することができる。
さらに、伸縮規制材からなる層がテープ状基材や粘着層の必要以上の伸びを規制して、長尺金属板の連結部への貼り着けに際し、部分的な薄肉部や切断が発生することを防止するので、専用装置による長尺金属板への自動貼り着け，自動カシメ作業にも適した新規な防水部材を提供することができた。
【００３５】
また、伸縮規制材として多数の開口部を有する経緯直交不織布等を用いることで、別途接着剤等を使用することなく伸縮規制材からなる層を形成し得、前述の効果を有する防水部材を低コストで製造することができた。
【００３６】
また、テープ状基材の厚みを防水部材全体の厚みの２５％以上とし、一方の粘着剤層の表面に離型紙を貼り着けて渦巻状に巻回することで、施工現場での取り扱い性にも優れる等、多くの効果を有する。
【図面の簡単な説明】
【図１】本発明に係る金属屋根用防水部材の実施形態の一例を示す斜視図。
【図２】図１の（Ｘ）−（Ｘ）線に沿う拡大断面図。
【図３】使用状態を示す金属屋根の要部拡大断面図。
【図４】他の実施形態を示す拡大断面図。
【符号の説明】
Ａ，Ａ’：防水部材
１：テープ状基材
２，３，２ａ，２ｂ：粘着剤層
４：伸縮規制材からなる層
５：離型紙[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a metal roof for connecting a connecting portion of long metal plates adjacent to each other to construct a metal roof by sandwiching the connecting portion (so-called goby) to impart waterproofness to the connecting portion. The present invention relates to a waterproof member.
[0002]
[Prior art]
Conventionally, for example, as disclosed in Patent Literature 1 and Patent Literature 2, a substantially round bar shape or a substantially square bar shape used when constructing a vertical long metal roof or a tiled bar long metal roof. Is known.
These waterproof members are sandwiched between the connecting portions when the metal roof is constructed by connecting the connecting portions of the adjacent long metal plates by caulking and fixing, and waterproof to the connecting portions of the long metal plates. Is provided.
[0003]
[Patent Document 1]
JP-A-1-107734 [Patent Document 2]
JP-A-7-233594
In recent years, for the purpose of reducing the manufacturing cost of the waterproofing member and simplifying the work of attaching the long metal plate to the connecting portion, a three-layer structure in which an adhesive layer is provided on both surfaces of the tape base material is used. Double-sided adhesive waterproof tape is also commercially available.
[0005]
[Problems to be solved by the invention]
The waterproof tape as described above can be manufactured at a low cost because it is sufficient to form an adhesive layer on both sides of the substrate, and because of the tape shape, it can be easily attached to the connecting portion of the long metal plate. However, since the tape thickness is thin, the filling of the connecting portion (goby) of the long metal plate connected by caulking is not sufficiently performed, and a gap is generated in the connecting portion due to aging, and waterproofness is reduced. There was a risk of lowering.
[0006]
In order to solve such a problem, it is conceivable to use a foam having a predetermined thickness as the tape base material. However, in this case, the tape is easily stretched, so that the tape is attached to the connecting portion of the long metal plate. When the tape is stretched, a thin portion is partially formed, and there is a possibility that the waterproof property of the thin portion may deteriorate with time.
Such a problem may be particularly significant when the connecting operation of the long metal plates is automatically performed by a dedicated device. In other words, when performing a work of pulling out the spirally wound waterproof tape and attaching it to the connecting portion of the long metal plate or a work of caulking and fixing the connecting portions with a dedicated device, it is difficult to adjust the tape pulling force. There is a possibility that the tape is unnecessarily elongated and the above-mentioned thin portion is generated, whereby the waterproofness is reduced and the tape may be cut.
[0007]
The present invention has been made in view of such a conventional situation, and the object thereof is a laminated tape structure in which an adhesive layer is provided on both surfaces of a base material made of a foam, which is used when attaching to a long metal plate. Provide a new waterproofing member for metal roofs that is not likely to be unnecessarily stretched, has excellent long-term waterproofness, and is suitable for automatic attaching work to a long metal plate and automatic caulking work using a dedicated device. It is in.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the inventors of the present application have conducted intensive studies, and as a result, based on a laminated tape having a pressure-sensitive adhesive layer provided on both sides of a foam base material, and a material having no elasticity. The inventor has found that the above-mentioned object can be achieved by providing the present invention, and has completed the present invention.
That is, the present invention provides a waterproof member for a metal roof that is sandwiched between the connecting portions to provide waterproofing to the connecting portions when the connecting portions of the adjacent long metal plates are connected to each other to construct a metal roof. So,
Waterproofing for metal roofs, characterized in that a pressure-sensitive adhesive layer is provided on both front and back surfaces of a tape-shaped base material made of a foam, and a layer made of an elastic material having flexibility but not elasticity is provided therein. It is a member.
[0009]
The waterproofing member for a metal roof of the present invention having such a configuration has a laminated tape structure in which an adhesive layer is provided on both sides of a tape-shaped base material made of a foam, so that a long metal plate to which the waterproofing member is attached is used. When connecting the connecting portions by caulking and fixing, the foam is compressed and sandwiched and filled by the restoring force without a gap in the connecting portion of the long metal plate due to its restoring force, maintaining high waterproofness for a long time. be able to. In addition, since a layer made of an elastic material having flexibility but not elasticity is laminated on the inside, a tape-shaped base material or an adhesive layer made of a foam is required when attaching to the connecting portion. There is no danger that the waterproofing property will not be reduced because of no extension.
Therefore, a waterproof member suitable for automatic sticking to a long metal plate and automatic caulking work by a dedicated device could be obtained.
[0010]
Examples of the expansion-constraining material used in the present invention include woven or non-woven fabrics made of natural fibers or synthetic fibers such as cotton, staple, polyethylene, and polypropylene, and films made of synthetic resins such as polyethylene and polypropylene. Above all, a nonwoven fabric in which a large number of openings are formed by synthesizing synthetic fibers arranged in a longitudinal direction and a horizontal direction at intervals and joining the intersections of the fibers, for example, a wariff and the like can be preferably used.
[0011]
Examples of the laminating mode of the layer made of the expansion / contraction material include a mode in which the layer is formed between the tape-shaped substrate and the pressure-sensitive adhesive layer and a mode in which the layer is formed within the thickness of the pressure-sensitive adhesive layer.
[0012]
In a mode in which a layer made of the expansion-constraining material is laminated between the tape-shaped base material and the pressure-sensitive adhesive layer, when a fabric-like or film-like expansion-constraining material having no opening is used, the expansion-constraining material is heat-pressed. Alternatively, the tape is laminated on the surface of the tape-shaped substrate by an adhesive or the like. When a non-woven fabric (for example, warif) having a large number of openings is used as the expansion / contraction material, an adhesive or the like does not need to be used because the adhesive is integrally bonded to the base material through the openings.
[0013]
In an embodiment in which a layer made of an elastic material is laminated within the thickness of the pressure-sensitive adhesive layer, when a fabric-like or film-like elastic material having no openings is used, a nonwoven fabric having a large number of openings (for example, a warif) In both cases, since the pressure-sensitive adhesives are integrally joined to the expansion / contraction regulating material, it is not necessary to use an adhesive or the like.
[0014]
Among them, considering the manufacturing cost and the strength against peeling of each laminated layer, a layer made of an expansion / contraction regulating material having a large number of openings is laminated and formed between the tape-shaped base material and the adhesive layer. Preferred embodiments or embodiments in which the adhesive layer is laminated within the thickness of the pressure-sensitive adhesive layer can be cited as preferred embodiments.
[0015]
As the tape-shaped substrate used in the present invention, a synthetic resin foam such as a polyethylene, a polyurethane, and a vinyl chloride, and various foams such as a natural rubber and a synthetic rubber can be used. Among these, a polyethylene resin foam can be preferably used in consideration of manufacturing cost, flexibility, mechanical strength, resilience, waterproofness due to independent foaming, and the like.
[0016]
As the pressure-sensitive adhesive layer used in the present invention, various pressure-sensitive adhesives such as synthetic resin-based and rubber-based pressure-sensitive adhesives can be used. Among these, a butyl rubber-based pressure-sensitive adhesive can be preferably used in consideration of the production cost, waterproofness, ease of forming a laminate on a tape-like substrate, and the like.
[0017]
In the waterproofing member of the present invention, the thickness of the tape-shaped substrate is set to 25% or more of the thickness of the entire waterproofing member, and a release paper is formed on the surface of one of the adhesive layers provided on both surfaces of the tape-shaped substrate. It is preferable to spirally wind the product in a state of being attached and to use it.
In the wound waterproof member formed as described above, the ratio of the pressure-sensitive adhesive layer on both sides, which are exposed surfaces to which the release paper is not attached, is less than 75% of the area of the entire waterproof member. The adhesive strength is reduced, and the blocking property in a state where a plurality of wound waterproof members are stacked is reduced.
[0018]
That is, this kind of waterproofing member is usually manufactured in a spirally wound state, and at a construction site of a metal roof, a plurality of wound-shaped members are formed in a state where both exposed side surfaces are located vertically. It is prepared by stacking waterproof members. At this time, if the thickness of the tape-shaped base material is less than 25% of the total thickness of the waterproofing member, the ratio of the adhesive layer on the exposed surface of the wound waterproofing member on which the release paper is not affixed increases. As a result of the increase in the adhesive strength on the both side surfaces, a blocking property in a state in which a plurality of wound waterproof members are stacked is increased, resulting in a trouble that handling becomes troublesome.
In the present invention, as described above, since the blocking property is low even when a plurality of wound waterproof members are stacked, the top wound waterproof member can be easily taken up, and handling at a construction site or the like is easy. It will be easier.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, examples of the embodiments will be described with reference to the drawings.
A waterproof member A for a metal roof (hereinafter simply referred to as a “waterproof member”) A shown in FIGS. 1 and 2 is an adhesive made of a butyl rubber-based adhesive on both the front and back surfaces of a tape-shaped substrate 1 made of a polyethylene resin foam. A layer 4 made of an elastic material having flexibility but not elasticity is provided between the tape base material 1 and the pressure-sensitive adhesive layer 2. It is formed in a tape shape having a width of about 6 to 6 mm and a width of about 5 to 30 mm. The release paper 5 is further adhered to the surface of one adhesive layer 2 and spirally wound.
[0020]
The polyethylene-based resin foam forming the tape-shaped substrate 1 is a known material for forming a substrate of an adhesive tape, and has desired flexibility, mechanical strength, durability, waterproofness, etc. Is formed in a tape shape having a thickness of about 0.5 to 2 mm, and when the connecting portions of the long metal plates to which the waterproof member A is attached are caulked and fixed to each other and connected, the connection is performed by the restoring force. It is sandwiched and filled without any gaps in the part, and exhibits high waterproofness for a long time.
[0021]
The pressure-sensitive adhesive layers 2 and 3 are formed by laminating a pressure-sensitive adhesive mainly composed of butyl rubber, which is known for forming a pressure-sensitive adhesive layer of a pressure-sensitive adhesive tape, on the front and back surfaces of the tape-shaped substrate 1 to a thickness of about 0.05 to 1 mm, respectively. When the waterproof member A is attached to the connecting portion of the long metal plate, the waterproof member A is formed so as to exhibit an appropriate adhesive force capable of correcting the attached position.
[0022]
In the layer 4 made of the expansion and contraction restricting material, synthetic fibers such as polyethylene and polypropylene are arranged in parallel in the vertical and horizontal directions at intervals, and a large number of openings 4a are formed by joining the intersections of the fibers to form a mesh. A non-woven fabric having a thickness of about 0.03 to 0.3 mm (for example, "Nisseki Warif" manufactured by Nisseki Plastics Co., Ltd.). By laminating on one surface, the pressure-sensitive adhesive layer 2 is laminated and formed on the surface, and the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 2 is adhered and integrated with the tape-shaped substrate 1 through the opening 4a. The waterproof member A is laminated between the tape-shaped base material 1 and the pressure-sensitive adhesive layer 2 so as not to hinder the flexibility of the waterproof member A but to regulate its elongation.
[0023]
If the opening area of the opening 4a is small and there is a concern about the strength of the tape-shaped substrate 1, the layer 4 made of the expansion and contraction control material, and the pressure-sensitive adhesive layer 2 against the peeling, the weft orthogonal non-woven fabric is applied to the tape-shaped substrate 1. It is preferable that the adhesive layer 2 is adhered to one of the front and back surfaces with an adhesive or the like, and the pressure-sensitive adhesive layer 2 is formed on the surface.
[0024]
The release paper 5 is a well-known member coated with silicon on both front and back surfaces, is attached to one adhesive layer 2 so as to be easily peeled off, and is the other adhesive of the spirally wound waterproof member A. It is in contact with layer 3 for easy release.
[0025]
As described above, the waterproof member A of the present example having the four-layer structure of the adhesive layer 2 / the layer 4 composed of the expansion / contraction regulating material (weft-orthogonal nonwoven fabric) / the tape-shaped substrate 1 / the adhesive layer 3 has a spiral shape. It is pulled out by the required length from the state where it is wound around, and the release paper 5 is peeled off and attached to one connecting portion of the long metal plates to be connected. At this time, since the layer 4 made of the elastic material prevents the tape-shaped substrate 1 and the adhesive layers 2 and 3 from being unnecessarily stretched, even if this attaching work is automatically performed by a dedicated device, The waterproof member A having a predetermined thickness can be adhered to the entire length of the connecting portion without causing a partial thin portion to be formed or cut on the tape-shaped base material 1.
After the attachment is completed, the connecting portions of the long metal plates are caulked and fixed to perform the connection. At this time, as shown in FIG. The metal plates 101 and 102 are sandwiched and filled without gaps between the connecting portions 103 and 104, so that the connecting portions can be provided with high waterproofness for a long time.
Although FIG. 3 shows a general vertical connecting shape as a connecting shape of long metal plates for constructing a metal roof, the waterproof member of the present invention is a tile bar type, a dovetail type, and a round goby. Various connection shapes such as formulas can be supported.
[0026]
FIG. 4 shows a waterproof member A ′ in which the layer 4 made of the expansion / contraction regulating material in the above-described waterproof member A is laminated within the thickness of the pressure-sensitive adhesive layer 2.
That is, the waterproofing member A ′ includes an adhesive layer 2a on one of the front and back surfaces of the tape-shaped base material 1, a layer 4 made of an expansion / contraction material formed on the surface of the adhesive layer 2a, and It is formed by laminating a pressure-sensitive adhesive layer 2b formed on the surface of a layer 4 made of an elastic material.
[0027]
Then, in the waterproof member A ', the adhesive layer 2a is adhered and integrated with the tape-shaped substrate 1, and the adhesive passes through the opening 4a of the nonwoven fabric and the adhesive layers 2a, 2b are mutually connected. Adhesively integrated to form a five-layer structure of an adhesive layer 2b / a layer made of an elastic material (elliptical nonwoven fabric) 4 / an adhesive layer 2a / a tape-shaped substrate 1 / an adhesive layer 3; 4 regulates the elongation of the waterproof member A, and the same effect as that of the above-described waterproof member A can be obtained.
In addition, since the pressure-sensitive adhesive layers 2a and 2b adhere to each other through the opening 4a of the weft nonwoven fabric, the layer 4 made of the expansion-contraction material can be laminated and integrated without using an adhesive or the like separately.
[0028]
【Example】
As a tape-shaped substrate made of a polyethylene-based resin foam, a corona-treated surface of both sides of Borrara IF08008 (0.8 mm thick) manufactured by Sekisui Chemical Co., Ltd. was used. A pressure-sensitive adhesive layer made of a butyl rubber-based pressure-sensitive adhesive is provided in a thickness of 0.5 mm, and a weft-orthogonal nonwoven fabric (warif) is used as a stretch-controlling material. And a tape-shaped base material made of polyethylene resin foam, and a tape-shaped base material made of a polyethylene resin foam provided with a pressure-sensitive adhesive layer made of a butyl rubber-based pressure-sensitive adhesive on both front and back surfaces thereof. A comparative sample 2 in the form of a tape having a width of 8 mm without forming a layer made of the material was formed.
[0029]
The samples 1 and 2 were subjected to a tensile test at a mark line distance of 12.5 mm and a tensile strength of 300 mm / min, and the breaking strength, the elongation at break, and the elongation under a load of 20 N were measured. Table 1 shows the results.
[0030]
[Table 1]
[0031]
Further, as a sample of the waterproofing member of the present invention, a sample was prepared in which the layer made of the elastic material in Sample 1 was formed between the tape-shaped base material and one of the pressure-sensitive adhesive layers. , The same results as in Sample 1 were obtained.
From the above measurement results, the waterproofing member according to the present invention has excellent breaking strength, and does not generate unnecessarily large elongation, and thus is useful for connecting long metal plates using a dedicated device. It could be confirmed.
[0032]
As described above, an example of the embodiment of the present invention has been described with reference to the drawings and the like. However, the waterproof member for a metal roof according to the present invention is not limited to the above-described one, and the technical features described in each claim of the claims are not limited. It goes without saying that various modifications are possible within the scope of the idea.
[0033]
【The invention's effect】
The waterproofing member for a metal roof according to the present invention is configured as described above, and has the following effects.
[0034]
A tape-shaped substrate made of a foam is sandwiched in a compressed state at the connecting portion of the long metal plate, and the restoring force fills the connecting portion without a gap. High waterproofness can be provided.
Furthermore, the layer made of the expansion / contraction regulating material regulates unnecessarily elongation of the tape-shaped base material and the adhesive layer, so that when the long metal plate is attached to the connecting portion, a partial thin portion or cut is generated. Therefore, a new waterproof member suitable for automatic sticking to a long metal plate by a dedicated device and automatic crimping work can be provided.
[0035]
Also, by using a weft orthogonal nonwoven fabric or the like having a large number of openings as a stretch regulating material, a layer made of the stretch regulating material can be formed without using an adhesive or the like separately. Could be manufactured at cost.
[0036]
In addition, the thickness of the tape-shaped base material is set to 25% or more of the thickness of the entire waterproof member, and a release paper is attached to the surface of one of the adhesive layers and spirally wound to improve handling at the construction site. Has many effects such as excellent
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of an embodiment of a waterproof member for a metal roof according to the present invention.
FIG. 2 is an enlarged sectional view taken along line (X)-(X) in FIG.
FIG. 3 is an enlarged sectional view of a main part of a metal roof showing a use state.
FIG. 4 is an enlarged sectional view showing another embodiment.
[Explanation of symbols]
A, A ': Waterproofing member 1: Tape-shaped base material 2, 3, 2a, 2b: Adhesive layer 4: Layer made of elastic material 5: Release paper
