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JP4230083B2 - Wallpaper made of thermoplastic resin - Google Patents
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JP4230083B2 - Wallpaper made of thermoplastic resin - Google Patents

Wallpaper made of thermoplastic resin Download PDF

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JP4230083B2
JP4230083B2 JP2000063270A JP2000063270A JP4230083B2 JP 4230083 B2 JP4230083 B2 JP 4230083B2 JP 2000063270 A JP2000063270 A JP 2000063270A JP 2000063270 A JP2000063270 A JP 2000063270A JP 4230083 B2 JP4230083 B2 JP 4230083B2
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backing paper
wallpaper
coating layer
layer
paper
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JP2001246719A (en
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俊夫 中本
武史 池田
伸一 大町
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Achilles Corp
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Achilles Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、熱可塑性樹脂からなる装飾層が設けられた熱可塑性樹脂製壁紙に関し、特に、使用後の壁紙を完全に取り除くことなく、汚れたり破れる等した装飾層を剥離するだけで、再度、壁紙として好適に使用することができる該壁紙に関する。
【0002】
【技術背景】
従来から、壁紙として、裏打紙の表面に塩化ビニル系樹脂や他の熱可塑性樹脂からなる層が形成されたものが広く使用されているが、初期においては、この層は、裏打紙表面に施したデザイン印刷を保護するためのものに過ぎず、従って立体感や意匠性に乏しいものであった。
その後、裏打紙の表面に上記のような種々の熱可塑性樹脂による装飾層を設けた、いわゆる熱可塑性樹脂製壁紙が開発され、現在では、この壁紙が広く使用されるようになっている。
この熱可塑性樹脂製壁紙等の壁紙の施工は、石膏ボード等からなる壁面に、適宜の接着剤を用いて貼着するのが一般的である。
【0003】
また、このような壁紙の張替えは、既に貼着してある壁紙を剥離した後、新たな壁紙を貼着するのが一般的であり、この剥離作業を容易にするために、裏打紙として、所定位置にて比較的容易に紙層間剥離させることができ、かつ剥離後の壁面には、表面が略平坦な薄層のみが残るようにした(いわゆる、ピールアップ性を付与した)裏打紙を使用するのが一般的である。
【0004】
一方、近年、環境保護や省資源の見地から、紙や合成樹脂等の再利用が求められることはもとより、廃棄物(ゴミ)の減量化が切望されている。
こうした観点、あるいは張替え作業に要する手間や費用の減少の観点から、張替え期間を延長することができる構成の壁紙が種々考案されており、例えば、特開平10−259599号には、裏打紙の表面に設けられた樹脂塗料層上にデザイン印刷を付与し、該印刷付与面に接着コントロール層を形成し、この上に多孔質のプラスチックフィルムを特定の剥離強度で熱圧着した構成の壁紙が開示されている。
この壁紙によれば、使用後に、デザイン印刷面を破壊することなく、多孔質プラスチックフィルムを剥離することができるため、新品同様の壁紙表面を容易に再現することができ、張替え期間を或る程度延長することが可能となる。
【0005】
しかし、この壁紙では、新品同様の壁紙表面と言えども、そのデザインは、多孔質プラスチックフィルムの剥離前後において全く同じであり、模様替え、あるいは雰囲気替え等を目的とする壁紙の張替えには適さない。
【0006】
【発明の目的】
そこで、本発明では、張替え期間を延長することができるばかりか、2種類の模様(デザイン)あるいは雰囲気を極めて容易に実現できる構成の熱可塑性樹脂製壁紙を提案することを目的とする。
【0007】
【発明の概要】
上記目的を達成するため、本発明の熱可塑性樹脂製壁紙は、裏打紙と、塗工層と、該裏打紙の表面に設けられた熱可塑性樹脂からなる装飾層とを有してなる熱可塑性樹脂製壁紙であって、
前記裏打紙は、表面側に、所望の図柄が印刷されており、
前記塗工層は、水溶性接着剤と充填材とからなる透明又は半透明の塗工液が、該裏打紙の該印刷面上に塗布されることにより設けられており、
前記装飾層は、塗工層上に設けられ、裏打紙に印刷された図柄とは異なるものであり、
前記裏打紙と前記装飾層とは、前記塗工層により一体化されていて、
前記塗工液は、固形分換算で、充填材100重量部に対して20〜80重量部の水溶性接着剤を含み、且つ塗工液の塗布量が固形分換算で4〜12g/m2であって
裏打紙の紙層間剥離強度f1が、JIS K 6854に規定されるT型剥離試験によるT型剥離力で150〜350g/25mm、
塗工層と装飾層との界面剥離強度f3が、該T型剥離力で100〜300g/25mmであり、
f1>f3で、かつこれら両剥離強度f1,f3が、塗工層と裏打紙の印刷面との界面剥離強度f4より小さいことを特徴とする。
このとき、装飾層の破断強度が、少なくとも2.0kg/5cmであることが好ましい。
【0008】
本発明の裏打紙の原紙に用いられる材料としては、従来から熱可塑性樹脂製壁紙用裏打紙の原紙の材料として使用されている針葉樹晒クラフトパルプ(NBKP)、広葉樹晒クラフトパルプ(LBKP)、砕木パルプ(GP)、サーモメカニカルパルプ(TMP)等の製紙用パルプや、古紙パルプ等から選ばれる少なくとも一種以上を適宜混合したものが挙げられる。
これらのパルプには、寸法安定性を向上させるために、アクリル繊維、ポリエステル繊維等の合成繊維や、ガラス繊維等の無機繊維を混合することもできる。
【0009】
上記のパルプ材料(繊維成分を混合したものも含む)には、従来の熱可塑性樹脂製壁紙用裏打紙の原紙の場合と同様に、不透明性、表面平滑性、隠蔽性、柔軟性、難燃性等を向上させるための填料を添加することもできる。
この填料としては、例えば、クレー、カオリン、焼成カオリン、タルク、炭酸カルシウム、酸化チタン等の一般的に使用されている填料や、水酸化アルミニウム、水酸化マグネシウム等の自己消火性を有する填料等が使用できる。
これら填料の添加量は、隠蔽性、難燃性、紙の強度等を考慮して、上記のパルプ材料(繊維成分を混合したものの場合には、パルプと繊維成分との合計量)100重量部に対し、5〜30重量部である。
【0010】
上記の填料と共に、通常使用されている各種の添加剤を加えることもできる。
例えば、滲み防止性、耐水性等を付与するための内添あるいは外添サイズ剤としてのデンプン、ロジン系サイズ剤、ワックス系サイズ剤、アルキルケテンダイマー、スチレン−アクリル酸エステル系共重合物等;紙力増強剤としての変性デンプン、α−デンプン、カチオン化デンプン等のデンプン、カルボキシメチルセルロース(CMC)、ポリビニルアルコール、変性尿素樹脂、ポリアクリルアミド樹脂、ゴムラテックス等;湿潤紙力増強剤としてのメラミン樹脂、尿素樹脂、ジアルデヒドデンプン、ポリエチレンイミン、エポキシ化ポリアミド樹脂、ポリアミドポリアミン樹脂、ポリアミドポリアミン・エピクロロヒドリン樹脂等;凝集・定着剤としての硫酸バンド、アルミン酸ソーダ、ポリアクリルアミド樹脂、ポリアクリル酸、ポリアクリル酸塩等;歩留向上剤としてのポリアクリルアミド樹脂、ポリエチレンイミン、ポリアミド樹脂等;消泡剤としてのシリコーン系消泡剤、高級アルコール系消泡剤、トリブチルホスフェートやソディウムオクチルホスフェート等の有機リン酸、ポリグリコール系消泡剤等;染料等が挙げられる。
【0011】
上記の材料からなる原紙は、長網抄紙機等を用い、従来の熱可塑性樹脂製壁紙用裏打紙と同様の製紙法により得ることができる。
この原紙は、従来の熱可塑性樹脂製壁紙用裏打紙と同様に、壁面からの剥離作業が容易に行えるように、ピールアップ性を付与しておくことが望ましい。
【0012】
上記の材料からなり、通常採用される製紙法にて得られる原紙は、表面側に所望の図柄が印刷される。
この印刷は、オフセット印刷、グラビア印刷、フレキソ印刷、ロータリースクリーン印刷等の方式で行われる。
【0013】
印刷インキは、印刷面上に設けられる塗工層を形成する塗工液(水溶性接着剤と充填材とからなる)をはじかないような溶剤系や特定の水系のものが使用される。
但し、本発明の壁紙は、使用後に、後述する熱可塑性樹脂からなる装飾層を剥離することにより、裏打紙に印刷した図柄を塗工層を介して目視できるようにして、新たな壁紙として使用するものであるため、塗工層と印刷面(裏打紙表面)との界面剥離強度(f4)を、装飾層と塗工層との界面剥離強度(f3)より大きくすることが重要であり、上記の印刷インキは、塗工層と密着するものが好ましい。
具体的には、塗工層に使用する樹脂の種類により異なり、この樹脂がアクリル系樹脂の場合には、ウレタン系インキやアクリル系インキが好ましく使用できる。
【0014】
また、本発明の壁紙では、上記の印刷面上に、塗工層が設けられる。
この塗工層は、水溶性接着剤と充填材とからなる塗工液を、裏打紙の印刷面上に塗布することにより設けられるもので、この塗工層により、裏打紙と後述する装飾層とが一体化される。
塗工層は、透明又は半透明とし、上記の印刷面が透視できるようにする。塗工層が半透明の場合は、該塗工層自体がマット状の意匠面となり、透明又は半透明の塗工層を着色する場合は、該塗工層を介して透視される印刷面が元々の印刷面とは異なった意匠面として認識される。
【0015】
上記の水溶性接着剤としては、酢酸ビニル−アクリル系共重合体、アクリル系重合体(例えば、アクリル酸ブチルエステル、アクリル酸エチルエステル、アクリル酸メチルエステル、メタクリル酸エチルエステル等の単独又は共重合物)、スチレン−ブタジエン系共重合体等のラテックス系のもの等の少なくとも1種を必須の接着剤として使用し、これらの接着剤には、デンプン、変性デンプン、カゼイン、カルボキシメチルセルロース(CMC)、ヒドロキシセルロース、大豆タンパク、ポリビニルアルコール等の水溶性接着剤を任意に混合してもよい。
上記の充填材としては、カオリン、クレー、サチンホワイト、酸化亜鉛、水酸化アルミニウム、炭酸カルシウム、酸化チタン等の顔料;染料;ポリアクリルアミド、ポリエチレンイミン、ポリアミド樹脂、アミノアルデヒド系樹脂、エポキシ系ポリアミド樹脂、炭酸ジルコニルアンモニウム等の重金属錯塩、グリオキザール、アミノリン酸化デンプン等の耐水化剤;ワックスエマルジョン等の滑剤;ステアリン酸カルシウム、ポリエチレングリコール等の潤滑剤が使用できる。
【0016】
塗工層と裏打紙(印刷面)との界面剥離強度(f4)、及び塗工層と後述する装飾層との界面剥離強度(f3)は、上記の塗工液中の必須の水溶性接着剤の配合量と、この塗工液で形成される塗工層の固形分の量を調整することにより、コントロールすることができる。
具体的には、必須の水溶性接着剤の配合量を、固形分の量で、充填材の固形分100重量部に対して20〜80重量部とし、塗工層の固形分の付着量を、4〜12g/m2、これらを充足することにより、f4>f3の関係を満たすことができるばかりか、塗工層と後述する装飾層との界面において均一な剥離が容易に実現できる。
【0017】
必須の水溶性接着剤の上記配合量が80重量部より多いと、接着力が弱すぎて、裏打紙と装飾層との一体化を図ることができないばかりか、壁紙の貼着作業中又は貼着後に、塗工層と装飾層との界面で剥離する虞れがあり、20重量部未満では、接着力が強くなりすぎて、本発明の壁紙使用後の塗工層と装飾層との界面での剥離が容易に行えず、美麗な剥離ができなくなる。
塗工層の固形分の付着量が4g/m未満では、塗工量の幅方向(裏打紙の幅方向)や流れ方向(裏打紙の移送方向)のバラツキが色ムラとなって印刷層の発色均一性を損ない、12g/mより多いと、塗工層による被覆作用が増大して印刷層を隠蔽し、何れの場合も、装飾層を剥離した後の壁紙としての意匠性を損なう。
【0018】
上記の塗工液の塗工方法としては、抄紙装置に組み込まれているオンマシーンコーティングや、抄紙工程後の各種コーターによるオフマシーンコーティングの何れであってもよい。
【0019】
なお、上記の塗工液は、裏打紙の印刷面に塗工すればよいが、裏面(壁面への貼着面)に塗工してもよい。壁面への貼着面にも塗工層を形成することで、壁面からの剥離性をも向上させることができる。
また、壁面への貼着面には、上記塗工液に代えて、特開昭52−37814号公報、特開昭52−37935号公報、特開昭55−98999号公報、特開平6−73700号公報、特開平6−330533号公報、特開平7−300800号公報等に提案されているような剥離性の層を形成することで、上記と同様に壁面からの剥離性向上を図ることもできる。
【0020】
本発明の壁紙では、上記の印刷面上に形成された塗工層上に更に、熱可塑性樹脂からなる装飾層が形成される。
この装飾層は、通常の熱可塑性樹脂製壁紙における装飾層と同様のものであって、塩化ビニル系樹脂、オレフィン系樹脂、アクリル系樹脂、ウレタン系樹脂であり、例えば、ポリ塩化ビニル、あるいは塩化ビニルを主体とする他のモノマーとの共重合樹脂等の塩化ビニル系樹脂に、可塑剤、安定剤、着色剤、充填材、難燃剤、防カビ剤、発泡剤、熱膨張性マイクロカプセル等を必要に応じて添加した塩化ビニル系樹脂ペーストを原料として形成される。
ところで、装飾層の破断強度は少なくとも2.0kg/5cm前後を必要とするため、ポリ塩化ビニルを熱可塑性樹脂成分とする場合には、重合度が1000以上のポリ塩化ビニルを使用することが好ましい。
また、上記の可塑剤の添加量は、塗工層等への影響を少なくするためには少ない方が望ましいが、装飾層の風合いや強度(引張り強度)等を考慮すると或る程度の添加量は必要であるため、通常の熱可塑性樹脂製壁紙における装飾層と同程度の量とすることが好ましい。
上記の充填材の添加量は、装飾層の剥離時の物性を確保するためには少ないことが望ましく、好ましくは100phr以下であり、より好ましくは50phr以下である。
上記以外の添加剤としては、装飾層の剥離性を向上させるために、シリコンオイル(ジメチルポリシロキ酸等)やフッ素系界面活性剤等の剥離性のある添加剤が好適に使用される。
【0021】
装飾層の形成は、上記のような原料を、通常の熱可塑性樹脂製壁紙における装飾層と同様に、ドクターナイフコーター、コンマドクターコーター、ロールコーター、リバースロールコーター、スクリーンコーター、ロータリースクリーンプリンター等の手段にて裏打紙の印刷面上の塗工層上に塗工した後、加熱してゲル化させ、必要に応じて発泡させればよい。
なお、本発明における装飾層は、剥離性の面からは、引っ張り強度や伸び等を考慮すると、発泡層よりも非発泡層が好ましい。
この装飾層は、単層であってもよいし、複数層であってもよい。
【0022】
また、通常の熱可塑性樹脂製壁紙のように、装飾層の表面に、メカニカルエンボス、印刷インキでの印刷模様、表面処理等を施してもよいし、あるいは発泡抑制剤及び/又は発泡促進剤を含むインキを使用してのケミカルエンボスを施すこともできる。
【0023】
本発明の壁紙は、貼着作業時及び貼着作業後には、装飾層が裏打紙から剥離することがなく、装飾層を塗工層との界面で剥離させて裏打紙の印刷面を目視できるようにする際には、この裏打紙の印刷面に形成してある塗工層の作用により、装飾層を塗工層との界面で容易に剥離できるという特性を有する。
従って、裏打紙上の印刷面はもとより、この上に設けられている塗工層をも傷付けることなく、装飾層を美麗に剥離することができ、裏打紙上の印刷面が美麗な状態で目視できる新しい壁紙が実現できる特性を有する。
【0024】
このとき、裏打紙自体の紙層間剥離強度f1、壁面と裏打紙裏面(裏打紙の裏面に前述の塗工層や剥離性の層が設けられている場合は、この塗工層や剥離性の層の面を裏打紙裏面と言う)との界面剥離強度f2、塗工層と装飾層との界面剥離強度f3、塗工層と裏打紙表面(裏打紙の印刷面)との界面剥離強度f4の関係において、装飾層を塗工層との界面にて剥離する作業の点からは、f3が、f1、f2、f4より小さいことが必要となる。
ここで、f1がf3より著しく小さいと、装飾層を塗工層との界面にて剥離する際に、塗工層と装飾層との界面剥離の外に、裏打紙自体の紙層間剥離が生じてしまう。
また、f2がf3より著しく小さい場合は、装飾層を塗工層との界面にて剥離する際に、壁紙自体が壁面より剥離してしまう。
更に、f4がf3より著しく小さい場合は、装飾層を塗工層との界面にて剥離する際に、塗工層と装飾層とが一体となって塗工層と裏打紙の界面で剥離し、印刷層が破壊され、壁紙の再使用ができなくなったり、装飾層を塗工層との界面で剥離し壁紙として再使用した後に裏打紙の紙層間で剥離する際に、塗工層と裏打紙との界面での剥離が生じ、印刷層が塗工層と裏打紙とに分離され、紙の回収再利用が困難となる。
この装飾層を塗工層との界面で剥離する際の上記のような不都合を抑制するためには、上記のf1、f2、f3、f4との関係が、f4≧f2>f1>f3、あるいはf2≧f4>f1>f3を満足するようにしておくことが重要である
【0025】
装飾層と塗工層との界面剥離強度f3は、前記のように塗工層を形成する塗工液の組成や塗工量を調整することにより、あるいは装飾層の組成や装飾層を形成する際の加工条件等によって調整することができるが、f3が小さすぎると、壁紙の貼着作業時や貼着作業後に、装飾層と塗工層との界面にて剥離してしまう虞れがあり、f3が大きすぎると、装飾層と塗工層との界面で剥離するのが困難となるため、JIS K 6854に規定されるT型剥離試験によるT型剥離力で100〜300g/25mmとし、120〜200g/25mmが好ましい。
【0026】
また、上記の裏打紙の紙層間剥離強度f1は、上記の紙力増強剤の添加量を調整することによって或る程度調整することができるが、過度に増強すると、裏打紙の古紙利用の際に水での離解が困難となり、弱すぎると、壁紙の貼着作業中や装飾層の剥離作業中に裏打紙の紙層間で剥離が生じることがあるため、f1は、上記のT型剥離力で、150〜350g/25mmとし、好ましくは160〜240g/25mmである。
【0027】
更に、壁面と裏打紙裏面との界面剥離強度f2は、弱すぎると、壁紙の貼着作業中や壁紙の使用中に、あるいは装飾層の剥離作業中に、壁紙が壁面から剥離する虞れがあり、強すぎると、最終的に壁紙を壁面から剥離する作業が困難となるため、上記のT型剥離力で、好ましくは200〜400g/25mm、より好ましくは200〜280g/25mmである。
塗工層と裏打紙の印刷面との界面剥離強度f4は、壁紙の貼着作業中や壁紙の使用中、あるいは装飾層の剥離作業中に、これらの界面での剥離がなく、しかも最終的に裏打紙の紙層間から均一に剥離した壁紙を再利用する際に、裏打紙の紙層間で均一に剥離し易くするために、200〜400g/25mm、より好ましくは200〜280g/25mmである。
以上のT型剥離力において、各層間の剥離強度を、式f4≧f2>f1>f3あるいは式f2≧f4>f1>f3を満たすように選択す
【0028】
以下、図面に基づいて本発明の壁紙の具体例について説明する。
図1は、本発明の壁紙1の一例を壁面7に貼着した状態(A)と、この状態の壁紙1において装飾層5を塗工層4との界面で剥離する状態(B)とで示す部分断面図であり、図2は、装飾層5を剥離した状態の本発明の壁紙1′の一例(A)と、この壁紙1′を壁面7から剥離する状態(B)とを示す部分断面図である。
【0029】
図1に示す本発明の壁紙1は、裏打紙2上に印刷3が施されており、この印刷3が施されている裏打紙2の上(以下、裏打紙の印刷面)に塗工層4が複数層(本例では3層)で設けられ、この塗工層4の表面に熱可塑性樹脂からなる装飾層5が設けられている。
このような構成を有する本発明の壁紙1は、接着剤6により、壁面7に貼着される。
【0030】
図1に示す本発明の壁紙1は、従来の壁紙と同様、図1(A)に示す状態で使用中に汚れた際には水拭き等による清掃が可能である。
また、或る程度の期間の使用の後に、装飾層5が破損したような場合、あるいは模様替えの必要がある場合等において、図1(B)に示すように、装飾層5を塗工層4との界面において剥離することができる。
【0031】
装飾層5を剥離した後の本発明の壁紙1′は、図2(A)に示すように、塗工層4が最外表面となり、該塗工層4を介して裏打紙2上の印刷面が目視可能となるため、新しいデザインの壁紙1′として継続して使用することができる。
図2(A)に示す状態の壁紙1′は、塗工層4の存在により、図1(A)の壁紙1と同様、汚れた場合には、水拭き等による清掃が可能である。
【0032】
最終的に壁紙1′を壁面7から剥離するには、図2(B)に示すように、裏打紙2を壁面7との界面で剥離させて、壁面7には、表面が略平滑な接着剤6が残るようにすることが好ましい。
このように、壁紙1′を剥離した際に、接着剤6が平滑な表面で壁面7に残るようにするためには、前述のように、裏打紙2の裏面(壁面7)側に、裏打紙2の印刷面3上に設ける塗工層と同様の構成の塗工層を設けたり、他の離型性の層を設ければよい。
なお、このような塗工層や離型性の層が裏打紙2の裏面に設けられていない場合には、図2(C)に示すように、壁紙1′を剥離した際には、裏打紙2の紙層間で剥離が生じ、壁紙1′と共に裏打紙2の一部21が剥離され、壁面7に裏打紙2の残部22が残存することとなる。
このとき、裏打紙2は、接着剤6が壁面7側より裏打紙2へ浸透して壁面7側の紙層間強度が高くなっているため、印刷面3側の紙層間で剥離されることとなるため、壁紙1′と共に剥離される裏打紙2の一部21は薄く、壁面7側に残る残部22は厚いものとなり、最終的に壁面7から回収されるのはこの厚い残部22の裏打紙のみとなる。
【0033】
以上のような構成の本発明の壁紙1の例において、裏打紙2の層間剥離強度f1、壁面7と裏打紙裏面との界面剥離強度f2、塗工層と装飾層との界面剥離強度f3、及び塗工層と裏打紙表面との界面剥離強度f4のそれぞれが、前述した強度を有すると共に、f4≧f2>f1>f3、あるいはf2≧f4>f1>f3の式を満たすようにする
これにより、装飾層5が塗工層4との界面において容易かつ美麗に剥離することができ、このとき裏打紙2が紙層間で剥離したり、壁面7から剥離したり、あるいは塗工層4と裏打紙2の印刷面3とが一体化して裏打紙2の紙層間から剥離する等の不都合が生じることはない。
【0034】
なお、本発明の壁紙1では、装飾層5の剥離の後に新たなデザインの壁紙1′として使用し、最終的に壁面7から剥離したものを古紙として再利用するに際しては、装飾層5は既に剥離されているため、図2(C)に示すように、塗工層4と印刷面3とが一体化されて裏打紙2の紙層間から均一に剥離され、壁面7に残存した裏打紙の残部22のみを壁面から剥離すればよく、剥離後に、再利用できない塗工層4と印刷層3とを裏打紙2から分離する手間が省略でき、作業効率が高い。
【0035】
一方、図3に示す従来の壁紙11(裏打紙2に直接、熱可塑性樹脂からなる装飾層5が形成されている構成のもの)では、上記した本発明の壁紙1と同様に、接着剤6により壁面7に貼着され(A)、壁面7より剥離する場合には、装飾層5は裏打紙2と共に剥離される(B)。
従って、壁紙としての使用期間は、本発明の壁紙に比して短いばかりか、剥離後の再利用に際しては、装飾層5と裏打紙2とを分離する必要があり、再利用の際の作業効率は悪い。
【0036】
【実施例】
例1
(1)裏打紙原紙の作製
表1に示す組成にてパルプスラリーを調製し、このスラリーのpHを硫酸バンドで約5に調整した後、長網抄紙機にて抄紙し、サイズプレスにおいて、表2に示す組成のサイズプレス液を紙表面に塗工し、乾燥して、110g/mの裏打紙原紙(密度0.5〜0.7g/m)を得た。
【0037】
【表1】

Figure 0004230083
【0038】
【表2】
Figure 0004230083
【0039】
(2)裏打紙原紙への図柄印刷
上記のようにして得られた裏打紙原紙の表面に、グラビア印刷で図柄の印刷を施した。
【0040】
(3)塗工液の作製及び塗工
表3に示す組成にて塗工液を作製した。
この塗工液を、エアーナイフ式コーターにより、裏打紙の印刷面上に、固形分で、8g/mとなるように塗工した。
【0041】
【表3】
Figure 0004230083
【0042】
(4)装飾層の形成
上記により得られた裏打紙上に、熱可塑性樹脂として塩化ビニル系樹脂を使用し、表4に示す組成でペースト状としたものを、スクリーンコーターにて200g/mとなるように塗工し、160℃で1分間加熱してゲル化し、ベース層を形成した。
このベース層上に、熱可塑性樹脂として塩化ビニル系樹脂を使用し、表5に示す組成でペースト状としたものを、ロータリースクリーンプリンターにて50g/mとなるように塗工し、160℃で1分間加熱してゲル化し、装飾層を形成した。
【0043】
【表4】
Figure 0004230083
【0044】
【表5】
Figure 0004230083
【0045】
上記のようにして得られた本発明の熱可塑性樹脂(塩化ビニル系樹脂)製壁紙において、各層間の剥離強度f1,f3,f4は、T型剥離力で、次の通りであり、この壁紙を接着剤として「ウォールボンド100」(矢沢化学社製商品名)を150g/mの量で使用して石膏ボードに貼着した際の壁面と裏打紙裏面との界面剥離強度f2は、T型剥離力で、次の通りであった。
裏打紙の紙層間剥離強度f1:200g/25mm
塗工層と装飾層との界面剥離強度f3:150g/25mm
塗工層と裏打紙印刷面との界面剥離強度f4:230g/25mm
壁面と裏打紙裏面との界面剥離強度f2:240g/25mm
【0046】
また、上記の壁紙を室内の壁面へ貼着したところ、貼着作業時及び貼着後3ヶ月経過後とも、裏打紙の印刷面と装飾層との界面にて剥離することはなかった。
貼着後3ケ月経過の後、装飾層を塗工層との界面で剥離したところ、印刷面の印刷インキはもとより、塗工層もはぎ取られることなく、装飾層のみが容易かつ美麗に剥離された。
【0047】
例2
裏打紙の印刷面に塗工する塗工液の付着量を1g/mとする以外は、例1と同様にした。
この結果、塗工液の付着量が少なすぎて、平滑な面の塗工層とすることが困難であった。
【0048】
例3
裏打紙の印刷面に塗工する塗工液の付着量を20g/mとする以外は、例1と同様にした。
この結果、塗工液の付着量が多すぎて、塗工層による隠蔽効果が高くなりすぎ、印刷面の目視が困難であった。
【0049】
例4
塗工液中のバインダーとして、填料100重量部に対してデンプン10重量部のみとする以外は、例1と同様にした。
この結果、装飾層と塗工層との界面剥離強度f3が200g/25mmとなり、装飾層の剥離時に、装飾層の一部が剥れず塗工層に残ってしまった。
【0050】
例5
塗工液中のバインダーとして、填料100重量部に対してSBRラテックス10重量部のみとする以外は、例1と同様にした。
この結果、装飾層と塗工層との界面剥離強度f3が230g/25mmとなり、装飾層の剥離時に裏打紙の紙層間剥離が生じてしまった。
【0051】
例6
塗工液中のバインダーとして、填料100重量部に対してSBRラテックス150重量部のみとする以外は、例1と同様にした。
この結果、装飾層と塗工層との界面剥離強度f3が20g/25mmとなり、貼着作業中に、装飾層が剥離してしまった。
【0052】
【発明の効果】
本発明の熱可塑性樹脂製壁紙においては、熱可塑性樹脂からなる装飾層と塗工層とが適度な界面剥離強度を有しており、貼着作業時及び貼着後の壁紙としての使用時は通常の熱可塑性樹脂製壁紙と同様であるが、壁紙として或る期間使用した後に装飾層を剥離すれば、裏打紙に施した図柄等の印刷面が目視でき、新たなデザインの壁紙として継続して使用することができる。
従って、本発明の壁紙は、使用期間が大幅に延長し、環境保護、省資源の見地から、極めて有用性の高いものである。
【図面の簡単な説明】
【図1】本発明の熱可塑性樹脂製壁紙の一例を、壁面に貼着した状態(A)及び装飾層を塗工層の界面で剥離する状態(B)を示す部分断面図である。
【図2】装飾層を剥離した図1に示す本発明の熱可塑性樹脂製壁紙(A)と、この状態の壁紙を壁面から剥離する状態(B),(C)を示す断面図である。
【図3】従来の熱可塑性樹脂製壁紙の一例を、壁面に貼着した状態(A)及び壁面より剥離する状態(B)を示す部分断面図である。
【符号の説明】
1, 本発明の熱可塑性樹脂製壁紙
1′ 本発明の熱可塑性樹脂製壁紙から装飾層のみを剥離した状態の壁紙
2 裏打紙
21 裏打紙の一部
22 裏打紙の残部
3 裏打紙に施した印刷
4 塗工層
5 装飾層
6 接着剤
7 壁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thermoplastic resin wallpaper provided with a decorative layer made of a thermoplastic resin, and in particular, without completely removing the used wallpaper, only by peeling the decorative layer that becomes dirty or torn, The present invention relates to a wallpaper that can be suitably used as a wallpaper.
[0002]
[Technical background]
Conventionally, wallpaper in which a layer made of a vinyl chloride resin or other thermoplastic resin is formed on the surface of the backing paper has been widely used, but in the initial stage, this layer is applied to the surface of the backing paper. This is only for protecting the printed design, and therefore has a poor three-dimensional effect and design.
Thereafter, so-called thermoplastic resin wallpaper was developed in which the decorative layer of the above-mentioned various thermoplastic resins was provided on the surface of the backing paper, and this wallpaper is now widely used.
In general, wallpaper such as thermoplastic resin wallpaper is applied to a wall surface made of gypsum board or the like using an appropriate adhesive.
[0003]
In addition, it is common that such wallpaper re-laying is done by peeling off the already pasted wallpaper, and then sticking a new wallpaper. In order to facilitate this peeling work, as a backing paper, A backing paper that can be peeled between papers at a predetermined position relatively easily and only a thin layer having a substantially flat surface remains on the wall surface after peeling (so-called peel-up property is provided). It is common to use.
[0004]
On the other hand, in recent years, from the viewpoint of environmental protection and resource saving, not only the reuse of paper, synthetic resin, etc. is required, but also the reduction of waste (trash) has been eagerly desired.
In view of this point of view, or from the viewpoint of reducing the labor and cost required for the redrawing work, various types of wallpaper having a constitution capable of extending the rehanging period have been devised. For example, JP-A-10-259599 discloses the surface of a backing paper. Disclosed is a wallpaper having a structure in which a design printing is applied on a resin coating layer provided on the surface, an adhesion control layer is formed on the surface to which the printing is applied, and a porous plastic film is thermocompression bonded with a specific peel strength thereon. ing.
According to this wallpaper, the porous plastic film can be peeled off after use without destroying the design printed surface, so that the wallpaper surface can be easily reproduced as new, and the re-covering period is to some extent It can be extended.
[0005]
However, in this wallpaper, although the surface of the wallpaper is the same as that of a new wallpaper, the design is completely the same before and after the porous plastic film is peeled off, and it is not suitable for wallpaper replacement for the purpose of pattern change or atmosphere change.
[0006]
OBJECT OF THE INVENTION
Therefore, an object of the present invention is to propose a wallpaper made of a thermoplastic resin that can not only extend the re-covering period but also can realize two types of patterns (designs) or atmosphere very easily.
[0007]
SUMMARY OF THE INVENTION
  To achieve the above object, the thermoplastic resin wallpaper of the present invention comprises a backing paper, a coating layer, and the surface of the backing paper.~ sideA wallpaper made of a thermoplastic resin having a decorative layer made of a thermoplastic resin provided in
  The backing paper has a desired pattern printed on the surface side,
  The coating layer is provided by applying a transparent or translucent coating liquid composed of a water-soluble adhesive and a filler onto the printed surface of the backing paper,
  The decorative layer is provided on the coating layer, and is different from the pattern printed on the backing paper,
  The backing paper and the decorative layer depend on the coating layer.RiichiBeing embodied,
  The coating liquid contains 20 to 80 parts by weight of a water-soluble adhesive with respect to 100 parts by weight of the filler in terms of solid content, and the coating amount of the coating liquid is 4 to 12 g / m in terms of solid content.2InWhat,
  The paper delamination strength f1 of the backing paper is 150 to 350 g / 25 mm as a T-type peel force according to a T-type peel test specified in JIS K 6854.
  The interfacial peel strength f3 between the coating layer and the decorative layer is 100 to 300 g / 25 mm as the T-type peel force,
  f1> f3 and both peel strengths f1 and f3 are smaller than the interfacial peel strength f4 between the coating layer and the printed surface of the backing paperIt is characterized by that.
  At this time,The breaking strength of the decorative layer is at least 2.0 kg / 5 cmIt is preferable that
[0008]
Examples of the material used for the backing paper of the present invention include softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), and ground wood that have been conventionally used as the base paper material for thermoplastic resin wallpaper backing paper. Examples thereof include those obtained by appropriately mixing at least one selected from paper pulp such as pulp (GP) and thermomechanical pulp (TMP), waste paper pulp, and the like.
These pulps can be mixed with synthetic fibers such as acrylic fibers and polyester fibers and inorganic fibers such as glass fibers in order to improve dimensional stability.
[0009]
For the above pulp materials (including those mixed with fiber components), opacity, surface smoothness, concealment, flexibility, flame resistance, as in the case of conventional backing paper for thermoplastic resin wallpaper. It is also possible to add a filler for improving the properties and the like.
Examples of the filler include commonly used fillers such as clay, kaolin, calcined kaolin, talc, calcium carbonate, titanium oxide, and self-extinguishing fillers such as aluminum hydroxide and magnesium hydroxide. Can be used.
The amount of these fillers added is 100 parts by weight of the above pulp material (in the case of a mixture of fiber components, the total amount of pulp and fiber components) in consideration of concealability, flame retardancy, paper strength, etc. The amount is 5 to 30 parts by weight.
[0010]
Various commonly used additives can be added together with the above filler.
For example, starch, rosin sizing agent, wax sizing agent, alkyl ketene dimer, styrene-acrylic acid ester copolymer, etc. as an internal or external sizing agent for imparting anti-bleeding properties, water resistance, etc .; Modified starch, α-starch, cationized starch, etc. as paper strength enhancer, carboxymethyl cellulose (CMC), polyvinyl alcohol, modified urea resin, polyacrylamide resin, rubber latex, etc .; Melamine resin as wet strength agent , Urea resin, dialdehyde starch, polyethyleneimine, epoxidized polyamide resin, polyamide polyamine resin, polyamide polyamine / epichlorohydrin resin, etc .; sulfate band, sodium aluminate, polyacrylamide resin, polyacrylic acid as aggregating / fixing agent , Poly Crylates, etc .; polyacrylamide resins, polyethyleneimines, polyamide resins, etc. as yield improvers; silicone-based antifoaming agents, higher alcohol-based antifoaming agents, antiphosphorus, tributyl phosphate, sodium octyl phosphate, etc. Examples include acids, polyglycol-based antifoaming agents, and dyes.
[0011]
The base paper made of the above materials can be obtained by a paper making method similar to that of a conventional thermoplastic resin wallpaper backing paper using a long paper machine or the like.
It is desirable that the base paper is provided with peel-up properties so that it can be easily peeled off from the wall surface, similarly to the conventional backing paper for thermoplastic resin wallpaper.
[0012]
A desired pattern is printed on the surface side of a base paper made of the above-mentioned materials and obtained by a commonly used paper making method.
This printing is performed by methods such as offset printing, gravure printing, flexographic printing, and rotary screen printing.
[0013]
  As the printing ink, a solvent-based ink or a specific water-based ink that does not repel a coating liquid (consisting of a water-soluble adhesive and a filler) that forms a coating layer provided on the printing surface is used.
  However, the wallpaper of the present invention can be used as a new wallpaper after use by peeling the decorative layer made of a thermoplastic resin, which will be described later, so that the design printed on the backing paper can be seen through the coating layer. Therefore, the interfacial peel strength (f4) between the coating layer and the printing surface (backing paper surface) may be made larger than the interfacial peel strength (f3) between the decorative layer and the coating layer.ImportantThe above-mentioned printing ink is preferably in close contact with the coating layer.
  Specifically, it varies depending on the type of resin used in the coating layer. When this resin is an acrylic resin, urethane ink or acrylic ink can be preferably used.
[0014]
Moreover, in the wallpaper of this invention, a coating layer is provided on said printing surface.
This coating layer is provided by applying a coating liquid composed of a water-soluble adhesive and a filler onto the printing surface of the backing paper. By this coating layer, the backing paper and a decorative layer to be described later are provided. Are integrated.
The coating layer is transparent or semi-transparent so that the printed surface can be seen through. When the coating layer is translucent, the coating layer itself becomes a mat-like design surface, and when the transparent or translucent coating layer is colored, the printed surface seen through the coating layer is It is recognized as a design surface different from the original printed surface.
[0015]
Examples of the water-soluble adhesive include vinyl acetate-acrylic copolymer, acrylic polymer (for example, butyl acrylate ester, ethyl acrylate ester, methyl acrylate ester, ethyl methacrylate ester, etc.) ), And at least one kind of latex such as styrene-butadiene copolymer is used as an essential adhesive, and these adhesives include starch, modified starch, casein, carboxymethylcellulose (CMC), You may mix arbitrarily water-soluble adhesives, such as a hydroxy cellulose, soybean protein, and polyvinyl alcohol.
Examples of the filler include pigments such as kaolin, clay, satin white, zinc oxide, aluminum hydroxide, calcium carbonate, and titanium oxide; dyes; polyacrylamide, polyethyleneimine, polyamide resin, aminoaldehyde resin, epoxy polyamide resin Water-resistant agents such as heavy metal complex salts such as zirconyl ammonium carbonate, glyoxal and aminophosphorylated starch; lubricants such as wax emulsions; lubricants such as calcium stearate and polyethylene glycol.
[0016]
  The interfacial peel strength (f4) between the coating layer and the backing paper (printing surface) and the interfacial peel strength (f3) between the coating layer and the decorative layer described later are essential water-soluble adhesives in the above coating liquid. It can be controlled by adjusting the blending amount of the agent and the solid content of the coating layer formed with this coating solution.
  Specifically, the blending amount of the essential water-soluble adhesive is 20 to 80 parts by weight with respect to 100 parts by weight of the solid content of the filler in the amount of solids, and the solid content of the coating layer is 4-12g / m2WhenShiBy satisfying these, not only the relationship of f4> f3 can be satisfied, but also uniform peeling can be easily realized at the interface between the coating layer and the decorative layer described later.
[0017]
If the above-mentioned blending amount of the essential water-soluble adhesive is more than 80 parts by weight, the adhesive strength is too weak to achieve integration of the backing paper and the decorative layer. After application, there is a risk of peeling at the interface between the coating layer and the decorative layer. If it is less than 20 parts by weight, the adhesive strength becomes too strong, and the interface between the coating layer and the decorative layer after using the wallpaper of the present invention. Peeling cannot be performed easily and beautiful peeling cannot be performed.
The amount of solid content of the coating layer is 4g / m2If the ratio is less than 1, the dispersion in the width direction of the coating amount (backing paper width direction) and the flow direction (backing paper transfer direction) becomes uneven, and the color uniformity of the printed layer is impaired.2If it is more, the covering action by the coating layer is increased and the printing layer is concealed, and in any case, the design as wallpaper after the decoration layer is peeled is impaired.
[0018]
The coating method of the coating liquid may be any of on-machine coating incorporated in a paper making apparatus and off-machine coating using various coaters after the paper making process.
[0019]
In addition, although said coating liquid should just be applied to the printing surface of backing paper, you may apply to the back surface (adhesion surface to a wall surface). By forming the coating layer on the surface to be adhered to the wall surface, the releasability from the wall surface can be improved.
In addition, instead of the above coating liquid, the surface to be adhered to the wall surface can be replaced with JP-A-52-37814, JP-A-52-37935, JP-A-55-98999, JP-A-6- By forming a peelable layer as proposed in Japanese Patent No. 73700, Japanese Patent Laid-Open No. 6-330533, Japanese Patent Laid-Open No. 7-300800, etc., the peelability from the wall surface can be improved as described above. You can also.
[0020]
In the wallpaper of the present invention, a decorative layer made of a thermoplastic resin is further formed on the coating layer formed on the printed surface.
This decorative layer is the same as the decorative layer in ordinary thermoplastic resin wallpaper, and is a vinyl chloride resin, an olefin resin, an acrylic resin, or a urethane resin, for example, polyvinyl chloride, or chloride. Add plasticizers, stabilizers, colorants, fillers, flame retardants, fungicides, foaming agents, thermal expansion microcapsules, etc. to vinyl chloride resins such as copolymer resins with other monomers mainly composed of vinyl. A vinyl chloride resin paste added as necessary is used as a raw material.
By the way, since the breaking strength of the decorative layer needs to be at least about 2.0 kg / 5 cm, when polyvinyl chloride is used as the thermoplastic resin component, it is preferable to use polyvinyl chloride having a polymerization degree of 1000 or more. .
In addition, the amount of the plasticizer added is preferably small in order to reduce the influence on the coating layer, but a certain amount added in consideration of the texture and strength (tensile strength) of the decorative layer. Therefore, it is preferable that the amount is the same as that of a decorative layer in a normal thermoplastic resin wallpaper.
The addition amount of the filler is desirably small in order to ensure the physical properties when the decorative layer is peeled off, preferably 100 phr or less, more preferably 50 phr or less.
As additives other than those described above, in order to improve the peelability of the decorative layer, a peelable additive such as silicon oil (dimethylpolysiloxy acid or the like) or a fluorosurfactant is preferably used.
[0021]
The decorative layer is formed by using the above raw materials, such as a doctor knife coater, a comma doctor coater, a roll coater, a reverse roll coater, a screen coater, and a rotary screen printer, in the same manner as a decorative layer in ordinary thermoplastic resin wallpaper. After coating on the coating layer on the printed surface of the backing paper by means, it may be heated to gel, and foamed if necessary.
The decorative layer in the present invention is preferably a non-foamed layer rather than a foamed layer from the viewpoint of peelability in consideration of tensile strength and elongation.
This decoration layer may be a single layer or a plurality of layers.
[0022]
Moreover, like a normal thermoplastic resin wallpaper, the surface of the decorative layer may be subjected to mechanical embossing, a printing pattern with printing ink, a surface treatment, or a foam inhibitor and / or a foam accelerator. Chemical embossing can also be performed using the ink containing.
[0023]
  In the wallpaper of the present invention, the decorative layer does not peel off from the backing paper during and after the sticking operation, and the printed surface of the backing paper can be visually observed by peeling the decorative layer at the interface with the coating layer. When doing so, the decorative layer can be easily peeled off at the interface with the coating layer by the action of the coating layer formed on the printing surface of the backing paper.
  Therefore, the printed surface on the backing paper isOriginallyIn addition, the decorative layer can be peeled beautifully without damaging the coating layer provided thereon, and a new wallpaper can be realized in which the printed surface on the backing paper can be visually observed in a beautiful state.
[0024]
  At this time, the paper delamination strength f1 of the backing paper itself, the wall surface and the back of the backing paper (if the above-mentioned coating layer or peelable layer is provided on the back of the backing paper, this coating layer or peelable The interfacial peel strength f2 between the coating layer and the decorative layer, and the interfacial peel strength f4 between the coating layer and the backing paper surface (printing surface of the backing paper). From the viewpoint of the work of peeling the decorative layer at the interface with the coating layer, f3 needs to be smaller than f1, f2, and f4.
  Here, when f1 is significantly smaller than f3, when the decorative layer is peeled at the interface with the coating layer, the paper delamination of the backing paper itself occurs in addition to the interface peeling between the coating layer and the decorative layer. End up.
  Moreover, when f2 is remarkably smaller than f3, when peeling a decoration layer in an interface with a coating layer, wallpaper itself will peel from a wall surface.
  Further, when f4 is significantly smaller than f3, when the decorative layer is peeled off at the interface with the coating layer, the coating layer and the decorative layer are integrally peeled off at the interface between the coating layer and the backing paper. When the printing layer is destroyed and the wallpaper cannot be reused, or when the decorative layer is peeled off at the interface with the coating layer and reused as wallpaper, it is peeled off between the paper layers of the backing paper. Peeling occurs at the interface with the paper, and the printed layer is separated into the coating layer and the backing paper, making it difficult to collect and reuse the paper.
  In order to suppress the inconvenience as described above when the decorative layer is peeled off at the interface with the coating layer, the relationship between f1, f2, f3, and f4 is f4 ≧ f2> f1> f3, or f2 ≧ f4> f1> f3 should be satisfiedis important.
[0025]
  The interfacial peel strength f3 between the decorative layer and the coating layer is adjusted by adjusting the composition and the coating amount of the coating liquid for forming the coating layer as described above, or by forming the composition and the decorative layer of the decorative layer. However, if f3 is too small, there is a risk of peeling at the interface between the decorative layer and the coating layer when the wallpaper is applied or after the application. If f3 is too large, it is difficult to peel off at the interface between the decorative layer and the coating layer. Therefore, the T-peeling force according to the T-peeling test specified in JIS K 6854 is 100 to 300 g / 25 mm.age120-200g / 25mmPreferGood.
[0026]
  Further, the paper delamination strength f1 of the backing paper can be adjusted to some extent by adjusting the amount of the paper strength enhancer added. However, if it is excessively increased, the used backing paper is used. It is difficult to disaggregate with water, and if it is too weak, f1 may be peeled off between the paper layers of the backing paper during wallpaper pasting or decoration layer peeling. so150-350g / 25mmAnd goodIt is preferably 160 to 240 g / 25 mm.
[0027]
  Furthermore, if the interfacial peel strength f2 between the wall surface and the backing paper back surface is too weak, the wallpaper may be peeled off from the wall surface during the wallpaper sticking operation, during the use of the wallpaper, or during the decoration layer peeling operation. If it is too strong, it will be difficult to finally peel off the wallpaper from the wall surface. Therefore, the T-type peeling force is preferably 200 to 400 g / 25 mm, more preferably 200 to 280 g / 25 mm.
  The interfacial peel strength f4 between the coating layer and the printed surface of the backing paper is such that there is no flaking at these interfaces during the pasting operation of the wallpaper, the use of the wallpaper, or the stripping operation of the decorative layer. When reusing the wallpaper uniformly peeled from the paper layer of the backing paper, it is 200 to 400 g / 25 mm, more preferably 200 to 280 g / 25 mm, in order to facilitate easy peeling between the paper layers of the backing paper. .
  With the above T-type peel force, the peel strength between the respective layers is selected so as to satisfy the formula f4 ≧ f2> f1> f3 or the formula f2 ≧ f4> f1> f3.Ru.
[0028]
Hereinafter, specific examples of the wallpaper of the present invention will be described with reference to the drawings.
FIG. 1 shows a state (A) in which an example of the wallpaper 1 of the present invention is attached to a wall surface 7 and a state (B) in which the decorative layer 5 is peeled off at the interface with the coating layer 4 in the wallpaper 1 in this state. FIG. 2 is a partial cross-sectional view, and FIG. 2 shows a part (A) of the wallpaper 1 ′ of the present invention in a state where the decorative layer 5 is peeled off and a state (B) where the wallpaper 1 ′ is peeled off from the wall surface 7. It is sectional drawing.
[0029]
The wallpaper 1 of the present invention shown in FIG. 1 has a printing 3 on a backing paper 2 and a coating layer on the backing paper 2 on which the printing 3 is applied (hereinafter, the printing surface of the backing paper). 4 is provided in a plurality of layers (three layers in this example), and a decorative layer 5 made of a thermoplastic resin is provided on the surface of the coating layer 4.
The wallpaper 1 of the present invention having such a configuration is attached to the wall surface 7 with an adhesive 6.
[0030]
The wallpaper 1 of the present invention shown in FIG. 1 can be cleaned by wiping with water or the like when it becomes dirty during use in the state shown in FIG.
Further, when the decorative layer 5 is damaged after use for a certain period, or when it is necessary to change the pattern, the decorative layer 5 is applied to the coating layer 4 as shown in FIG. It can peel at the interface.
[0031]
As shown in FIG. 2A, the wallpaper 1 ′ of the present invention after the decorative layer 5 is peeled off has the coating layer 4 as the outermost surface, and printing on the backing paper 2 through the coating layer 4. Since the surface becomes visible, it can be used continuously as a newly designed wallpaper 1 '.
The wallpaper 1 ′ in the state shown in FIG. 2A can be cleaned by wiping with water or the like when it becomes dirty due to the presence of the coating layer 4, as with the wallpaper 1 in FIG.
[0032]
In order to finally peel off the wallpaper 1 'from the wall surface 7, the backing paper 2 is peeled off at the interface with the wall surface 7 as shown in FIG. It is preferable that the agent 6 remains.
As described above, when the wallpaper 1 'is peeled off, in order to leave the adhesive 6 on the wall surface 7 with a smooth surface, as described above, the backing is placed on the back surface (wall surface 7) side of the backing paper 2. What is necessary is just to provide the coating layer of the structure similar to the coating layer provided on the printing surface 3 of the paper 2, or to provide another release layer.
When such a coating layer or a releasable layer is not provided on the back side of the backing paper 2, as shown in FIG. Peeling occurs between the paper layers of the paper 2, part of the backing paper 2 is peeled off together with the wallpaper 1 ′, and the remaining part 22 of the backing paper 2 remains on the wall surface 7.
At this time, the backing paper 2 is peeled between the paper layers on the printing surface 3 side because the adhesive 6 penetrates into the backing paper 2 from the wall surface 7 side and the paper interlayer strength on the wall surface 7 side is high. Therefore, a part 21 of the backing paper 2 to be peeled together with the wallpaper 1 ′ is thin, and the remaining portion 22 remaining on the wall surface 7 side is thick, and what is finally recovered from the wall surface 7 is the backing paper of the thick remaining portion 22. It becomes only.
[0033]
  In the example of the wallpaper 1 of the present invention configured as described above, the delamination strength f1 of the backing paper 2, the interfacial peel strength f2 between the wall surface 7 and the back of the backing paper, the interfacial peel strength f3 between the coating layer and the decorative layer, In addition, each of the interfacial peel strengths f4 between the coating layer and the backing paper surface has the above-described strength and satisfies the formula of f4 ≧ f2> f1> f3 or f2 ≧ f4> f1> f3..
  As a result, the decorative layer 5 can be easily and beautifully peeled off at the interface with the coating layer 4. At this time, the backing paper 2 peels off between the paper layers, peels off from the wall surface 7, or the coating layer 4. And the printing surface 3 of the backing paper 2 are integrated with each other so that inconveniences such as peeling from the paper layer of the backing paper 2 do not occur.
[0034]
In the wallpaper 1 of the present invention, when the decorative layer 5 is used as the newly-designed wallpaper 1 'after peeling off the decorative layer 5, and the paper finally peeled off from the wall surface 7 is reused as waste paper, the decorative layer 5 is already present. As shown in FIG. 2C, the coating layer 4 and the printing surface 3 are integrated and uniformly peeled from the paper layer of the backing paper 2, and the backing paper remaining on the wall surface 7 is removed. Only the remaining part 22 has to be peeled from the wall surface, and after the peeling, the labor of separating the coating layer 4 and the printing layer 3 that cannot be reused from the backing paper 2 can be omitted, and the working efficiency is high.
[0035]
On the other hand, in the case of the conventional wallpaper 11 shown in FIG. 3 (with the decorative layer 5 made of a thermoplastic resin directly formed on the backing paper 2), the adhesive 6 is similar to the wallpaper 1 of the present invention described above. Is attached to the wall surface 7 by (A) and peeled off from the wall surface 7, the decorative layer 5 is peeled off together with the backing paper 2 (B).
Therefore, the period of use as wallpaper is shorter than that of the wallpaper of the present invention, and it is necessary to separate the decorative layer 5 and the backing paper 2 when reused after peeling. Efficiency is bad.
[0036]
【Example】
Example 1
(1) Production of backing paper
A pulp slurry was prepared with the composition shown in Table 1, and after adjusting the pH of the slurry to about 5 with a sulfuric acid band, paper was made with a long net paper machine, and in a size press, a size press liquid having the composition shown in Table 2 Is coated on the paper surface and dried to 110 g / m2Backing paper (density 0.5-0.7 g / m3)
[0037]
[Table 1]
Figure 0004230083
[0038]
[Table 2]
Figure 0004230083
[0039]
(2) Design printing on backing paper
The design was printed on the surface of the backing paper obtained as described above by gravure printing.
[0040]
(3) Preparation of coating liquid and coating
A coating solution was prepared with the composition shown in Table 3.
This coating solution is applied on the printed surface of the backing paper with an air knife coater at a solid content of 8 g / m.2It was coated so that
[0041]
[Table 3]
Figure 0004230083
[0042]
(4) Formation of decorative layer
On the backing paper obtained as described above, a vinyl chloride resin was used as the thermoplastic resin, and a paste-like composition having the composition shown in Table 4 was applied to a screen coater at 200 g / m.2The base layer was formed by heating at 160 ° C. for 1 minute to form a gel.
On this base layer, a vinyl chloride resin was used as the thermoplastic resin, and the paste shown in Table 5 was prepared with a rotary screen printer at 50 g / m.2It was coated so as to become a gel by heating at 160 ° C. for 1 minute to form a decorative layer.
[0043]
[Table 4]
Figure 0004230083
[0044]
[Table 5]
Figure 0004230083
[0045]
In the wallpaper made of the thermoplastic resin (vinyl chloride resin) of the present invention obtained as described above, the peel strengths f1, f3, and f4 between the respective layers are T-type peel forces as follows. 150 g / m of “Wall Bond 100” (trade name, manufactured by Yazawa Chemical Co., Ltd.)2The interfacial peel strength f2 between the wall surface and the back of the backing paper when it was used in the amount of and adhered to the gypsum board was T-type peel force as follows.
Paper delamination strength of backing paper f1: 200 g / 25 mm
Interfacial peel strength f3 of coating layer and decorative layer: 150 g / 25 mm
Interfacial peel strength between coating layer and backing paper printing surface f4: 230 g / 25 mm
Interfacial peel strength between wall surface and backing paper back surface f2: 240 g / 25 mm
[0046]
Moreover, when the above wallpaper was stuck on the wall surface of the room, it was not peeled off at the interface between the printed surface of the backing paper and the decorative layer even during the sticking operation and after three months had passed since sticking.
After 3 months after sticking, the decoration layer was peeled off at the interface with the coating layer, and not only the printing ink on the printing surface but also the coating layer was not peeled off, only the decoration layer was peeled off easily and beautifully. It was done.
[0047]
Example 2
1 g / m of coating liquid applied to the printed surface of the backing paper2The procedure was the same as in Example 1 except that
As a result, the adhesion amount of the coating liquid was too small, and it was difficult to obtain a coating layer having a smooth surface.
[0048]
Example 3
The amount of coating liquid applied to the printed surface of the backing paper is 20 g / m.2The procedure was the same as in Example 1 except that
As a result, the amount of coating liquid deposited was too large, the concealing effect by the coating layer was too high, and visual observation of the printed surface was difficult.
[0049]
Example 4
  The same procedure as in Example 1 was conducted except that only 10 parts by weight of starch per 100 parts by weight of filler was used as the binder in the coating solution.
  As a result, the interfacial peel strength f3 between the decorative layer and the coating layer is 200 g / 25 mm,When peeling the decorative layerA part of the decorative layer did not peel off and remained in the coating layer.
[0050]
Example 5
The same procedure as in Example 1 was performed except that only 10 parts by weight of SBR latex was used as the binder in the coating liquid with respect to 100 parts by weight of the filler.
As a result, the interfacial peel strength f3 between the decorative layer and the coating layer was 230 g / 25 mm, and the paper delamination of the backing paper occurred when the decorative layer was peeled off.
[0051]
Example 6
The same procedure as in Example 1 was performed except that only 150 parts by weight of SBR latex was used as the binder in the coating liquid with respect to 100 parts by weight of the filler.
As a result, the interfacial peel strength f3 between the decorative layer and the coating layer was 20 g / 25 mm, and the decorative layer was peeled off during the sticking operation.
[0052]
【The invention's effect】
In the thermoplastic resin wallpaper of the present invention, the decorative layer and the coating layer made of a thermoplastic resin have an appropriate interfacial peel strength, and when used as wallpaper after sticking and after sticking It is the same as ordinary thermoplastic resin wallpaper, but if the decorative layer is peeled off after being used for a certain period of time as wallpaper, the printed surface such as the pattern on the backing paper can be visually observed, and it continues as a wallpaper with a new design. Can be used.
Therefore, the wallpaper of the present invention has a very long useful period and is extremely useful from the viewpoint of environmental protection and resource saving.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing an example of a thermoplastic resin wallpaper according to the present invention in a state where it is attached to a wall surface (A) and a state where a decorative layer is peeled off at the interface of a coating layer (B).
FIG. 2 is a cross-sectional view showing the thermoplastic resin wallpaper (A) of the present invention shown in FIG. 1 with the decorative layer peeled off, and the states (B) and (C) of peeling the wallpaper in this state from the wall surface.
FIG. 3 is a partial cross-sectional view showing an example of a conventional thermoplastic resin wallpaper pasted on a wall surface (A) and peeled off from the wall surface (B).
[Explanation of symbols]
1, The wallpaper made of the thermoplastic resin of the present invention
1 'Wallpaper in which only the decorative layer is peeled off from the thermoplastic resin wallpaper of the present invention
2 Backing paper
21 Part of backing paper
22 Remaining backing paper
3 Printing on backing paper
4 Coating layer
5 decoration layers
6 Adhesive
7 Wall

Claims (2)

裏打紙と、塗工層と、該裏打紙の表面に設けられた熱可塑性樹脂からなる装飾層とを有してなる熱可塑性樹脂製壁紙であって、
前記裏打紙は、表面側に、所望の図柄が印刷されており、
前記塗工層は、水溶性接着剤と充填材とからなる透明又は半透明の塗工液が、該裏打紙の該印刷面上に塗布されることにより設けられており、
前記装飾層は、塗工層上に設けられ、裏打紙に印刷された図柄とは異なるものであり、
前記裏打紙と前記装飾層とは、前記塗工層により一体化されていて、
前記塗工液は、固形分換算で、充填材100重量部に対して20〜80重量部の水溶性接着剤を含み、且つ塗工液の塗布量が固形分換算で4〜12g/m2であって
裏打紙の紙層間剥離強度f1が、JIS K 6854に規定されるT型剥離試験によるT型剥離力で150〜350g/25mm、
塗工層と装飾層との界面剥離強度f3が、該T型剥離力で100〜300g/25mmであり、
f1>f3で、かつこれら両剥離強度f1,f3が、塗工層と裏打紙の印刷面との界面剥離強度f4より小さいことを特徴とする熱可塑性樹脂製壁紙。
A thermoplastic resin wallpaper comprising a backing paper, a coating layer, and a decorative layer made of a thermoplastic resin provided on the surface side of the backing paper,
The backing paper has a desired pattern printed on the surface side,
The coating layer is provided by applying a transparent or translucent coating liquid composed of a water-soluble adhesive and a filler onto the printed surface of the backing paper,
The decorative layer is provided on the coating layer, and is different from the pattern printed on the backing paper,
Said with the backing paper and the decorative layer, have been one conjugated Ri by the said coating layer,
The coating liquid contains 20 to 80 parts by weight of a water-soluble adhesive with respect to 100 parts by weight of the filler in terms of solid content, and the coating amount of the coating liquid is 4 to 12 g / m 2 in terms of solid content. I der,
The paper delamination strength f1 of the backing paper is 150 to 350 g / 25 mm as a T-type peel force according to a T-type peel test specified in JIS K 6854.
The interfacial peel strength f3 between the coating layer and the decorative layer is 100 to 300 g / 25 mm as the T-type peel force,
A wallpaper made of a thermoplastic resin , wherein f1> f3 and the two peel strengths f1 and f3 are smaller than the interfacial peel strength f4 between the coating layer and the printed surface of the backing paper .
装飾層の破断強度が、少なくとも2.0kg/5cmであることを特徴とする請求項1に記載の熱可塑性樹脂製壁紙。The thermoplastic resin wallpaper according to claim 1, wherein the decorative layer has a breaking strength of at least 2.0 kg / 5 cm.
JP2000063270A 2000-03-08 2000-03-08 Wallpaper made of thermoplastic resin Expired - Fee Related JP4230083B2 (en)

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