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JP4264789B2 - Application method and apparatus - Google Patents
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JP4264789B2 - Application method and apparatus - Google Patents

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JP4264789B2
JP4264789B2 JP2000138370A JP2000138370A JP4264789B2 JP 4264789 B2 JP4264789 B2 JP 4264789B2 JP 2000138370 A JP2000138370 A JP 2000138370A JP 2000138370 A JP2000138370 A JP 2000138370A JP 4264789 B2 JP4264789 B2 JP 4264789B2
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JP2001316647A (en
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伸夫 浜本
薫 石川
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Fujifilm Corp
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Fujifilm Corp
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Description

【0001】
【発明の属する技術分野】
本発明は接着テープ及び塗布方法並びに装置に係り、特に、接着テープで接合された接合部を有する帯状可撓性支持体(以下「ウエブ」という)を搬送路に搬送させながら塗布ヘッドで塗布液を塗布する塗布方法及び装置に関する。
【0002】
【従来の技術】
搬送ローラ等の搬送手段を経由して搬送するウエブに塗布ヘッドで塗布液を塗布する場合、塗布を行う現ウエブの後端と次に塗布を行う新ウエブの前端を接着テープで接合して連続塗布を行うことにより、現ウエブから新ウエブに切り換わるときに塗布運転を停止しないようにしている。
【0003】
しかし、ウエブ同士が接着テープで接合された接合部では、塗布ムラや塗布スジ等の塗布故障が発生し易いという問題がある。
【0004】
この為、接合部を有するウエブに塗布液を塗布する塗布方法では、接合部で発生する塗布故障による損失を軽減するために、以下のような種々の対策がとられている。
【0005】
例えば、特開昭54−62241号公報では、接合部の被塗布面に予め疎水性液体を付与することが開示されている。また、特開昭58−88074号公報には、接合部が塗布される直前に、塗布ヘッドを塗布位置から移動させてウエブから離し、接合部が通過後に塗布ヘッドを再び元の塗布位置に戻す方法が開示されている。更に、特許2632265号公報では、接合部に黒色層を設け表面電位を0.5〜2.0kVに荷電させる方法が開示されている。
【0006】
【発明が解決しようとする課題】
しかしながら、上記した従来の塗布方法では、接合部による空気同伴が原因の塗布ムラや塗布スジ等の塗布故障を軽減することはできても、接合部を接合する接着テープの端部からはみだした糊に起因する塗布ムラを解消することはできないという問題がある。即ち、接着テープの端部からはみだした糊が搬送路の搬送ローラ等に付着し、その付着した糊が下流側のウエブに転写されると、転写されたウエブ部分に塗布された塗布膜に塗布ムラが発生する。
【0007】
本発明は、このような事情に鑑みてなされたもので、接合部を接合する接着テープの端部からの糊はみ出しによる塗布ムラを解消し、接合部を有する帯状可撓性支持体の塗布品質を向上させることのできる接着テープ及び塗布方法並びに装置を提供することを目的とする。
【0008】
【課題を解決するための手段】
本発明は、前記目的を達成するために、接着テープで接合された接合部を有する帯状可撓性支持体を搬送させながら塗布液で塗布する塗布方法であって、前記帯状可撓性支持体の接合部が搬送ローラ等の搬送手段に接触経由して搬送される塗布方法において、前記接着テープとして、糊層が形成されていない前記接着テープの表面と前記帯状可撓性支持体の幅方向に平行な前記接着テープの側面とのなす角度が45°〜75°の範囲になるように前記側面が裁断されたものを用いることを特徴とする。
【0010】
また、本発明は、前記目的を達成するために、接着テープで接合された接合部を有する帯状可撓性支持体を搬送させながら塗布液で塗布する塗布装置であって、前記帯状可撓性支持体の接合部が搬送ローラ等の搬送手段に接触経由して搬送される塗布装置において、前記接合部を接合する接着テープの側面を裁断する裁断手段を設けると共に、該裁断手段は、糊層が形成されていない前記接着テープの表面と前記帯状可撓性支持体の幅方向に平行な前記接着テープの側面とのなす角度が45°〜75°の範囲になるように前記側面を裁断するものであることを特徴とする。
【0011】
本発明によれば、塗布液が塗布される帯状可撓性支持体の接合部を接合する接着テープとして、糊層が形成されていない接着テープの表面と帯状可撓性支持体の幅方向に平行な接着テープの側面とのなす角度が45°〜75°の範囲になるように側面が裁断されている接着テープを用いるようにしたので、帯状可撓性支持体が搬送ローラ等の搬送手段を接触経由する際に、接着テープの端部から糊がはみ出しにくくできる。これにより、接着テープの糊が搬送ローラ等に付着し、その付着した糊が下流側のウエブに転写されるということを防止できるので、接合部に接着テープを有する帯状可撓性支持体に塗布液を塗布した際に塗布ムラや塗布スジが発生しないようにできる。また、接合部の空気同伴に起因する塗布ムラの発生もない。
【0012】
【発明の実施の形態】
以下、添付図面により本発明の接着テープ及びそれを用いた塗布方法並びに装置の好ましい実施の形態について詳説する。
【0013】
図1は、ウエブに塗布液を塗布する塗布装置10の構成の一例を模式的に示す構成図であり、塗布ヘッドとしてビード塗布用のスライドホッパー12の例で説明する。
【0014】
図1に示すように、ウエブ14に塗布される複数(例えば3種類)の塗布液16A、16B、16Cは、図示しないそれぞれの塗布液タンクから送液量が可変可能な各送液ポンプによりスライドホッパー12内の各マニホールド18A、18B、18Cに供給される。マニホールド18A、18B、18Cに供給された各塗布液16A、16B、16Cは所定の幅になるように塗布幅方向に拡流された後、スリット状に形成された各スロット20A、20B、20Cを通ってスライドホッパー12上面の下方傾斜したスライド面22に押し出される。スライド面22に押し出された各塗布液16A、16B、16Cは、多層塗布膜状の多層塗布膜16となってスライド面22を流下し、スライド面22下端のリップ先端24に達する。一方、長方形状の接着テープ26で接合された接合部28を有するウエブ14は、搬送路に設けられた搬送ローラ30を経由し、スライドホッパー12に対向配置されたバックアップローラ32に係合支持されて搬送される。そして、リップ先端24に達した多層塗布液は、リップ先端24と、バックアップローラ32に係合支持されるウエブ14面との間隙にビード部34を形成し、このビード部34において、ウエブ14はバックアップローラ32の周面に沿って下方から上方に搬送する。これにより、ビード部34における多層塗布液は、ウエブ14面の上に引き上げられる作用を受けて引き伸ばされて薄層化する。この結果、搬送するウエブ14面上に薄層化した多層塗布膜16を形成することができる。このとき、ビード部34を安定化させるため、吸引チャンバ36によりビード部34の下側が減圧される。
【0015】
上述したウエブ14への塗布液の塗布において、図1に示したように、ウエブ14の接合部28が搬送ローラ30にラップした状態で経由するときに、接着テープ26の糊層38(図3、図4参照)が搬送ローラ30とウエブ14とで挟圧され、接着テープ26の端部からはみだした糊38Aが搬送ローラ30に付着し、その付着した糊38Aが下流側のウエブ14に転写されると、図2に示すように糊が転写されたウエブに塗布された多層塗布膜16に斑点状の塗布ムラが発生してしまう。この場合、接合部28を接合する接着テープ26のウエブ幅方向の側面からはみだす糊38Aは、ウエブ14の耳部(ウエブの両端部)に転写されるので影響は小さいが、接着テープ26のウエブ幅方向と平行な側面からはみだす糊はウエブ14の中央部に転写されるので塗布品質に与える影響が大きい。
【0016】
ところで、従来の接着テープ26は、図3に縦断面図を示すように、テープ基材40の裏面に糊層38(接着剤層)を有し、糊層38に離けい紙42を仮着して構成され、糊層38が形成されていない接着テープ26の表面44と接着テープ26の側面46とのなす角度αが直角(90°)に形成されている。尚、図3、図4では、角度αとして、接着テープ26の表面と側面46との延長線のなす角度で示してある。そして、ウエブ14の端部同士を接合する場合には、接着テープ26から離けい紙42を剥がして糊層38を露出し、ウエブ14の端部同士を突き合わせた状態で、突き合わせ部分に沿って接着テープ26を貼り付ける。以下、糊層38が形成されていない接着テープ26の表面44と接着テープ26の側面46とのなす角度αを「接着テープ26の側面角度α」と称す。
【0017】
そして、本発明者は、接着テープ26からの糊のはみだしによる塗布ムラ防止について鋭意研究した結果、接着テープ26の側面角度αが、糊のはみだしに大きく影響するという知見を得た。
【0018】
本発明の接着テープ26は、上記知見に基づいて成されたもので、裏面に糊層38を有する接着テープ26において、接着テープ26の側面角度αが45°〜75°の範囲になるように側面46が裁断されて構成される。
【0019】
本発明の接着テープ26を構成するテープ基材40としては、アルミ蒸着、黒色層含有、半透明加工、着色加工等を施された、PETテープ、セロハンテープ、ビニールテープ、布テープ等を使用することができる。
【0020】
また、本発明の塗布装置は、本発明の接着テープをインプラントで用いることができるようにしたもので、図1で説明した塗布装置10に、接着テープ26の裁断装置48を組み込むことにより構成される。
【0021】
図5は、裁断装置48を模式的に示した全体構成図である。
【0022】
供給リール50には、裁断前の接着テープ26がロール状に巻回され、巻回された接着テープ26は、カッター台52を経由して巻取リール53に巻き取られる。尚、55はパスローラである。
【0023】
カッター台52は、図6に示すように、縦断面が台形な基台54の一対の傾斜側面56、56にそれぞれ裁断刃58、58が傾斜に対応して設けられ、ボルト60、60で基台54に固定される。また、この一対の裁断刃58、58は、図7に示すように、裁断される接着テープ26の進行方向61に向かってハの字状になるように配置されると共に、接着テープ26の離けい紙42側が上を向くようにして裁断される。これにより、巻取リール53が接着テープ26を巻き取ると、供給リール50から繰り出された接着テープ26の幅方向両端部は、カッター台52により図8に示すように裁断される。この結果、図4で示したように、裁断された帯状の接着テープ26の幅方向両端は、側面角度αが45°〜75°の範囲になるように裁断される。側面角度αを45°〜75°の範囲内で調整するには、傾斜面56の異なる基台54を複数用意するか、あるいは1台の基台54の傾斜面56の角度を調整できるような構造にするとよい。
【0024】
裁断刃58の種類としては、片刃カミソリ、両刃カミソリ、カッター刃等を使用することができ、また単に先鋭な部分を有する金属、無機物、プラスチック等でもよい。また、裁断刃58としては、固定刃が好ましいが、回転刃をも使用することもできる。裁断する前の接着テープ26の幅は、10mm〜100mmが一般的である。裁断する接着テープ端部の幅は、0.5mm〜5mm、好ましくは1mm〜2mmがよい。また、裁断した接着テープ26の表面に塗布液が乗りやすいように、放電処理や疎水処理を施しても良いし、30°C以上に加熱してもよい。
【0025】
尚、本発明の塗布装置に使用する塗布ヘッド12としては、ビード塗布用のスライドホッパーに限定されるものではなく、カーテン塗布、エクトルージョン塗布、ロール塗布、エアナイフコーター、ブレードコーター、バーコータ等を使用することができる。
【0026】
次に、本発明の塗布装置を用いて接合部28に接着テープ26を有するウエブ14に塗布液を塗布する塗布方法を説明する。
【0027】
カッター台52により、側面角度αが45°〜75°になるように裁断前の接着テープ26を裁断する。そして、この裁断した接着テープ26を用い、塗布を行うウエブ14の後端と次に塗布を行うウエブ14の前端を突き合わせて接合する。この場合、塗布されるウエブ14の端部同士を接合するために用いられる接着テープ26としては、上述したように、ウエブ幅方向と平行な接着テープ26の側面46からはみだす糊38Aはウエブ14の中央部に転写されるので塗布品質に与える影響が大きいことから、ウエブ14の幅方向に平行な側面角度αが45°〜75°の範囲になるように側面46を裁断した接着テープ26を用いることが好ましい。対向する2つの側面46の側面角度αは、両方の側面46とも同じ側面角度αであってもよく、異なる側面角度αでもさしつかえない。また、一方の側面46のみの側面角度αを45°〜75°の範囲になるようにすることでも効果が得られる。
【0028】
接着テープ26でのウエブ同士の接合は、塗布を行う前に予め接合しておいてもよく、ウエブ14の搬送路上に公知の自動接合装置(図示せず)を設けて、ウエブ14を搬送路に搬送させたまま自動接合してもよい。
【0029】
接着テープ26で接合された接合部28を有するウエブ14は、図1に示したように、ウエブ14の接合部28が搬送ローラ30にラップした状態で経由するときに、接着テープ26の糊層38が搬送ローラ30とウエブ14とで挟圧される。
【0030】
しかし、本発明では、接着テープ26の側面角度αが45°〜75°の範囲を満足するように裁断されているので、接着テープ26の端部からの糊のはみだしを防止することができる。これにより、従来のように、はみだした糊38Aが、搬送ローラ30に付着し、その付着した糊が下流側のウエブ14に転写されて塗布ムラを発生させることがないので、塗布品質を向上させることができる。
【0031】
接着テープ26の側面角度αが45°〜75°の範囲を満足することにより、糊のはみだしが防止される理由としては、図9に示すように、接着テープ26の側面46が適度に傾斜していることにより、ウエブ14が糊層38のみでなく接着テープ26の側面46にも密着し易くなる。この結果、接着テープ26の側面46とウエブ14との間に隙間62が形成されなくなるために、接着テープ26の端部からの糊のはみだしが防止されるものと考察される。特に、ウエブ14が搬送ローラ30にラップすると、ウエブ14が接着テープ26の側面46に一層密着し易くなるので、糊層38がウエブ14と搬送ローラ30とで挟圧されても、その挟圧力が逆に接着テープ26の側面46とウエブ14との間の隙間62をなくす方向に作用するためと考察される。
【0032】
これに対し、従来の接着テープ26のように、側面角度αが90°の場合には、図10に示すように、ウエブ14が接着テープ26の側面46に密着し難いために、接着テープ26の側面46とウエブ14との間に隙間62が形成され、特に搬送ローラ30を経由する際に接着テープ26の端部からはみだした糊38Aが搬送ローラ30に付着するものと考察される。
【0033】
また、接着テープ30の側面角度αが45°未満の場合には、ウエブ14が接着テープ26の側面46に密着し易いという点では同様であるが、側面角度αが小さすぎると、カッター台52で裁断する際に、接着テープ26が裁断刃58に引っ掛かって裁断が不能になると共に、裁断されたとしても裁断面、即ち側面46が凸凹になり糊がはみだし易くなる。
【0034】
このように、本発明の塗布方法及び塗布装置によれば、塗布液が塗布されるウエブ14の接合部28を接合する接着テープ26として、ウエブ14の幅方向に平行な接着テープ26の側面角度が45°〜75°の範囲になるように側面46が裁断されたものを用いるようにしたので、ウエブ14が搬送ローラ30を経由する際にも接着テープ26の端部から糊がはみ出しにくくすることができる。これにより、接着テープ26の糊が搬送ローラ30等に付着し、その付着した糊が下流側のウエブ14に転写されるということを防止できるので、接合部28に接着テープ26を有するウエブ14に塗布液を塗布した際に塗布ムラや塗布スジが発生しないようにでき、塗布品質を向上させることができる。
【0035】
また、接着テープ26の側面角度を45°〜75°の範囲になるようにすることで接合部28の空気同伴に起因した塗布ムラの発生もない。
【0036】
【実施例】
次に、本発明の実施例を説明する。
(実施例1)
図5の裁断装置を用いて、幅50mmのアルミ蒸着PETテープの両端部2mmを100mに渡って裁断し、側面角度αが75°の接着テープを作成した。この接着テープでウエブ同士の接合部を接合し、接合部に接着テープを有するウエブを、図1に示した搬送路を200m/分で搬送させ、スライドホッパーとバックアップローラとによるビード塗布を行った。多層塗布膜は3層であり、塗布液の総塗布量を80cc/m2 、最下層の塗布液量を12cc/m2 、最下層のゼラチン濃度を5重量%、最下層の10(l/s)における粘度を27mPas、ウエブの表面温度を32°Cとした。また、ウエブは、ゼラチン下引き層を表面に有するTACフィルムを使用した。
(実施例2)
図5の裁断装置で接着テープの側面角度αを60°に裁断した以外は、実施例1と同様とした。
(実施例3)
図5の裁断装置で接着テープの側面角度αを45°に裁断した以外は、実施例1と同様とした。
(比較例1)
側面角度αが90°の従来の接着テープをそのまま使用した以外は、実施例1と同様とした。
(比較例2)
図5の裁断装置で接着テープの側面角度αを30°に設定して裁断した。
(比較例3)
図5の裁断装置で接着テープの側面角度αを90°に裁断した以外は、実施例1と同様とした。
(比較例4)
図5の裁断装置で接着テープの側面角度αを135°に裁断した以外は、実施例1と同様とした。
【0037】
そして、実施例1〜3及び比較例1〜3について、ウエブが搬送ローラを経由した後の接着テープ端部からの糊のはみだしの有無を光学顕微鏡により観察すると共に、塗布された塗布膜の塗布ムラを目視にて観察した。塗布ムラについては、接着テープの端部からの糊のはみだしに起因するものと、接合部の空気同伴に起因する塗布ムラとを分けて観察した。結果を表1に示す。
【0038】
【表1】

Figure 0004264789
表1の、実施例1〜3の結果から分かるように、接着テープの側面角度αが45°〜75°の範囲に入っている場合には、接着テープの端部からの糊のはみだしがなかった。これにより、糊のはみだしに起因した塗布ムラがないだけでなく、空気同伴に起因した塗布ムラもなく、安定した塗布を行うことができた。
【0039】
これに対し、従来の接着テープをそのまま使用した比較例1の場合には、空気同伴に起因した塗布ムラはないものの、接着テープの端部からの糊のはみだしに起因する塗布ムラが発生した。側面角度αを30°に設定した裁断装置で裁断を試みた比較例2の場合には、裁断を5m実施したところで接着テープが裁断刃に引っ掛かって裁断が不能になってしまった。接着テープの側面角度αを90°に裁断した比較例3は、比較例1と同様の結果であった。また、接着テープの側面角度αを135°に裁断した比較例4は、糊のはみだしに起因した塗布ムラと、空気同伴に起因した塗布ムラの両方が発生した。
【0040】
【発明の効果】
以上説明したように、本発明によれば、接合部を接合する接着テープの端部からの糊はみだしを防止することができる。
【0041】
これにより、接着テープで接合した接合部を有する帯状可撓性支持体に塗布液を塗布する場合に、糊のはみだしに起因する塗布ムラを解消することができ、更には接合部の空気同伴に起因する塗布ムラも発生しない。従って、接合部を有する帯状可撓性支持体の塗布品質を向上させることができる。
【図面の簡単な説明】
【図1】塗布装置の一例を模式的に説明する説明図
【図2】接着テープの糊のはみだしに起因する塗布ムラを説明する説明図
【図3】従来の接着テープの断面図
【図4】本発明の接着テープの断面図
【図5】本発明の塗布装置に設けられた裁断装置を模式的に説明する説明図
【図6】裁断装置におけるカッター台の側面図
【図7】裁断装置におけるカッター台の上面図
【図8】裁断装置で接着テープを裁断している上面図
【図9】本発明の接着テープを用いた塗布装置の作用を説明する説明図
【図10】従来の接着テープを用いた塗布装置の作用を説明する説明図
【符号の説明】
10…塗布装置、12…スライドホッパー、14…ウエブ、16…多層塗布膜、22…スライド面、26…接着テープ、28…接合部、30…搬送ローラ、32…バックアップローラ、34…ビード部、38…接着テープの糊層、40…接着テープのテープ基材、42…接着テープの離けい紙、44…接着テープの表面、46…接着テープの側面、48…裁断装置、50…供給リール、52…カッター台、53…巻取リール、54…カッター台の基台、56…カッター台の傾斜面、58…カッター台の裁断刃、62…ウエブと搬送ローラとの間の隙間[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an adhesive tape, a coating method, and an apparatus, and more particularly, a coating liquid with a coating head while transporting a belt-like flexible support (hereinafter referred to as “web”) having a joint joined by the adhesive tape to a transport path. The present invention relates to a coating method and a device for coating a film.
[0002]
[Prior art]
When applying the coating liquid to the web transported via transport means such as transport rollers, the rear end of the current web to be coated and the front end of the new web to be coated next are joined together with adhesive tape. By performing coating, the coating operation is not stopped when the current web is switched to the new web.
[0003]
However, there is a problem that application failure such as application unevenness and application stripes is likely to occur at a bonded portion where the webs are bonded with an adhesive tape.
[0004]
For this reason, in the coating method in which the coating liquid is applied to the web having the joint portion, the following various measures are taken in order to reduce the loss due to the coating failure occurring at the joint portion.
[0005]
For example, Japanese Patent Application Laid-Open No. 54-62241 discloses that a hydrophobic liquid is applied in advance to the coated surface of the joint. Japanese Patent Laid-Open No. 58-88074 discloses that immediately before the joint is applied, the coating head is moved away from the application position and separated from the web, and after the joint has passed, the coating head is returned to the original application position again. A method is disclosed. Furthermore, Japanese Patent No. 2632265 discloses a method in which a black layer is provided at the joint and the surface potential is charged to 0.5 to 2.0 kV.
[0006]
[Problems to be solved by the invention]
However, with the above-described conventional coating method, although the coating failure such as coating unevenness and coating streaks caused by air entrainment at the joint portion can be reduced, the glue protruded from the end of the adhesive tape that joins the joint portion. There is a problem that the coating unevenness due to the film cannot be eliminated. That is, when the glue sticking out from the end of the adhesive tape adheres to the conveyance roller or the like of the conveyance path, and the adhered glue is transferred to the downstream web, it is applied to the coating film applied to the transferred web portion. Unevenness occurs.
[0007]
The present invention has been made in view of such circumstances. The application quality of the strip-shaped flexible support having the joint portion is solved by eliminating the uneven application of the paste from the end of the adhesive tape that joins the joint portion. It is an object of the present invention to provide an adhesive tape, a coating method, and an apparatus capable of improving the quality.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a coating method in which a belt-like flexible support having a joint joined by an adhesive tape is applied with a coating liquid while being conveyed, and the belt-like flexible support In the coating method in which the joint portion is conveyed via contact with a conveying means such as a conveying roller, the adhesive tape has no adhesive layer formed on the surface of the adhesive tape and the width direction of the belt-like flexible support. The side surface is cut so that the angle formed with the side surface of the adhesive tape parallel to the surface is in the range of 45 ° to 75 °.
[0010]
In order to achieve the above object, the present invention is a coating apparatus that applies a coating solution while transporting a belt-like flexible support having a joint joined by an adhesive tape, the belt-like flexibility. In the coating apparatus in which the joint portion of the support is transported via contact with a transport means such as a transport roller, a cutting means for cutting the side surface of the adhesive tape that joins the joint portion is provided, and the cutting means includes a glue layer The side surface is cut so that the angle formed between the surface of the adhesive tape not formed with the side surface of the adhesive tape parallel to the width direction of the belt-like flexible support is in the range of 45 ° to 75 °. It is characterized by being.
[0011]
According to the present invention, as an adhesive tape for joining the joint portion of the strip-shaped flexible support to which the coating liquid is applied, the adhesive tape is formed on the surface of the adhesive tape on which no adhesive layer is formed and in the width direction of the strip-shaped flexible support. Since the adhesive tape whose side surface is cut so that the angle formed with the side surface of the parallel adhesive tape is in the range of 45 ° to 75 ° is used, the belt-like flexible support is a conveying means such as a conveying roller. When passing through the contact, it is possible to prevent the glue from protruding from the end of the adhesive tape. This prevents adhesive tape from adhering to the transport roller, etc., and transferring the adhered adhesive to the downstream web, so it can be applied to a belt-like flexible support with an adhesive tape at the joint. It is possible to prevent application unevenness and application stripes from occurring when the liquid is applied. Further, there is no occurrence of coating unevenness due to air entrainment at the joint.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of an adhesive tape of the present invention, a coating method using the same, and an apparatus will be described in detail with reference to the accompanying drawings.
[0013]
FIG. 1 is a configuration diagram schematically showing an example of the configuration of a coating apparatus 10 that applies a coating solution to a web. An example of a slide hopper 12 for bead coating as an application head will be described.
[0014]
As shown in FIG. 1, a plurality (for example, three types) of coating liquids 16A, 16B, and 16C applied to the web 14 are slid by liquid feeding pumps that can vary the amount of liquid feeding from respective coating liquid tanks (not shown). It is supplied to each manifold 18A, 18B, 18C in the hopper 12. The coating liquids 16A, 16B, and 16C supplied to the manifolds 18A, 18B, and 18C are spread in the coating width direction so as to have a predetermined width, and then the slots 20A, 20B, and 20C formed in a slit shape are provided. It passes through the slide surface 22 inclined downward on the upper surface of the slide hopper 12. The coating liquids 16A, 16B, and 16C pushed out to the slide surface 22 become the multilayer coating film 16 in the form of a multilayer coating film, flow down the slide surface 22, and reach the lip tip 24 at the lower end of the slide surface 22. On the other hand, the web 14 having the joint portion 28 joined by the rectangular adhesive tape 26 is engaged and supported by the backup roller 32 disposed opposite to the slide hopper 12 via the transport roller 30 provided in the transport path. Are transported. The multi-layer coating liquid that has reached the lip tip 24 forms a bead portion 34 in the gap between the lip tip 24 and the surface of the web 14 that is engaged and supported by the backup roller 32. In this bead portion 34, the web 14 is It is conveyed from below to above along the peripheral surface of the backup roller 32. As a result, the multilayer coating liquid in the bead portion 34 is stretched under the action of being pulled up on the surface of the web 14 to be thinned. As a result, a thin multilayer coating film 16 can be formed on the surface of the web 14 to be conveyed. At this time, in order to stabilize the bead portion 34, the lower side of the bead portion 34 is decompressed by the suction chamber 36.
[0015]
In the application of the coating liquid to the web 14 described above, as shown in FIG. 1, when the joining portion 28 of the web 14 passes in a state of being wrapped by the conveying roller 30, the adhesive layer 38 (see FIG. 3) of the adhesive tape 26. 4) is sandwiched between the conveying roller 30 and the web 14, and the glue 38A protruding from the end of the adhesive tape 26 adheres to the conveying roller 30, and the adhered glue 38A is transferred to the downstream web 14. Then, as shown in FIG. 2, spotted coating unevenness occurs in the multilayer coating film 16 applied to the web to which the glue is transferred. In this case, the adhesive 38A protruding from the side surface in the web width direction of the adhesive tape 26 that joins the joint portion 28 is transferred to the ear portions (both ends of the web) of the web 14 and thus has little influence, but the web of the adhesive tape 26 Since the glue protruding from the side surface parallel to the width direction is transferred to the center of the web 14, it has a great influence on the coating quality.
[0016]
By the way, the conventional adhesive tape 26 has a glue layer 38 (adhesive layer) on the back surface of the tape base 40 and temporarily attaches a release paper 42 to the glue layer 38, as shown in a longitudinal sectional view in FIG. Thus, the angle α formed between the surface 44 of the adhesive tape 26 on which the adhesive layer 38 is not formed and the side surface 46 of the adhesive tape 26 is formed at a right angle (90 °). 3 and 4, the angle α is an angle formed by an extension line between the surface of the adhesive tape 26 and the side surface 46. When joining the end portions of the web 14, the release paper 42 is peeled off from the adhesive tape 26 to expose the adhesive layer 38, and the end portions of the web 14 are butted together, along the butted portion. Adhesive tape 26 is affixed. Hereinafter, the angle α formed between the surface 44 of the adhesive tape 26 on which the adhesive layer 38 is not formed and the side surface 46 of the adhesive tape 26 is referred to as “side angle α of the adhesive tape 26”.
[0017]
As a result of earnest research on prevention of coating unevenness due to the sticking out of the adhesive tape 26, the inventor has found that the side surface angle α of the adhesive tape 26 greatly affects the sticking out of the adhesive.
[0018]
The adhesive tape 26 of the present invention is made based on the above knowledge, and in the adhesive tape 26 having the adhesive layer 38 on the back surface, the side surface angle α of the adhesive tape 26 is in the range of 45 ° to 75 °. The side 46 is cut and configured.
[0019]
As the tape base material 40 constituting the adhesive tape 26 of the present invention, PET tape, cellophane tape, vinyl tape, cloth tape, etc., subjected to aluminum vapor deposition, black layer containing, translucent processing, coloring processing, etc. are used. be able to.
[0020]
Further, the coating apparatus of the present invention is configured such that the adhesive tape of the present invention can be used in an implant, and is configured by incorporating a cutting device 48 for the adhesive tape 26 into the coating apparatus 10 described in FIG. The
[0021]
FIG. 5 is an overall configuration diagram schematically showing the cutting device 48.
[0022]
The adhesive tape 26 before cutting is wound around the supply reel 50 in a roll shape, and the wound adhesive tape 26 is wound around the take-up reel 53 via the cutter table 52. Reference numeral 55 denotes a pass roller.
[0023]
As shown in FIG. 6, the cutter base 52 is provided with cutting blades 58, 58 corresponding to the inclination on a pair of inclined side surfaces 56, 56 of a base 54 having a trapezoidal longitudinal section. Fixed to the base 54. Further, as shown in FIG. 7, the pair of cutting blades 58, 58 are arranged in a C shape toward the traveling direction 61 of the adhesive tape 26 to be cut, and the adhesive tape 26 is separated. The cut paper 42 is cut so that the side faces upward. Thus, when the take-up reel 53 winds up the adhesive tape 26, both ends in the width direction of the adhesive tape 26 fed out from the supply reel 50 are cut by the cutter base 52 as shown in FIG. 8. As a result, as shown in FIG. 4, both ends in the width direction of the cut strip-shaped adhesive tape 26 are cut so that the side surface angle α is in the range of 45 ° to 75 °. In order to adjust the side surface angle α within the range of 45 ° to 75 °, a plurality of bases 54 having different inclined surfaces 56 are prepared, or the angle of the inclined surface 56 of one base 54 can be adjusted. It should be structured.
[0024]
As the type of the cutting blade 58, a single-blade razor, a double-blade razor, a cutter blade or the like can be used, and a metal, an inorganic material, a plastic or the like having a sharp portion may be used. The cutting blade 58 is preferably a fixed blade, but a rotating blade can also be used. The width of the adhesive tape 26 before cutting is generally 10 mm to 100 mm. The width of the edge of the adhesive tape to be cut is 0.5 mm to 5 mm, preferably 1 mm to 2 mm. Moreover, an electric discharge treatment or a hydrophobic treatment may be performed so that the coating liquid can easily get on the surface of the cut adhesive tape 26, or the surface may be heated to 30 ° C. or higher.
[0025]
The coating head 12 used in the coating apparatus of the present invention is not limited to a slide hopper for bead coating, but uses curtain coating, extrusion coating, roll coating, air knife coater, blade coater, bar coater, etc. can do.
[0026]
Next, a coating method for coating the coating solution on the web 14 having the adhesive tape 26 at the joint portion 28 using the coating apparatus of the present invention will be described.
[0027]
The adhesive tape 26 before cutting is cut by the cutter base 52 so that the side surface angle α is 45 ° to 75 °. Then, using the cut adhesive tape 26, the rear end of the web 14 to be coated and the front end of the web 14 to be coated next are butted and joined. In this case, as the adhesive tape 26 used for joining the ends of the web 14 to be applied, as described above, the glue 38A protruding from the side surface 46 of the adhesive tape 26 parallel to the web width direction is the web 14 Since it is transferred to the central portion and has a great influence on the coating quality, the adhesive tape 26 in which the side surface 46 is cut so that the side surface angle α parallel to the width direction of the web 14 is in the range of 45 ° to 75 ° is used. It is preferable. The side surface angle α of the two opposing side surfaces 46 may be the same side surface angle α for both side surfaces 46 or may be a different side surface angle α. The effect can also be obtained by setting the side surface angle α of only one side surface 46 to a range of 45 ° to 75 °.
[0028]
The webs may be bonded to each other with the adhesive tape 26 before application, and a known automatic bonding device (not shown) is provided on the conveyance path of the web 14 so that the web 14 is conveyed to the conveyance path. It may be automatically joined while being conveyed.
[0029]
As shown in FIG. 1, the web 14 having the joining portion 28 joined by the adhesive tape 26 passes through the joining portion 28 of the web 14 while being wrapped by the conveying roller 30. 38 is sandwiched between the conveying roller 30 and the web 14.
[0030]
However, in the present invention, since the side surface angle α of the adhesive tape 26 is cut so as to satisfy the range of 45 ° to 75 °, it is possible to prevent the paste from protruding from the end of the adhesive tape 26. As a result, the pasted glue 38A adheres to the conveying roller 30 and the adhered glue is not transferred to the downstream web 14 to cause coating unevenness as in the prior art, thereby improving the coating quality. be able to.
[0031]
As shown in FIG. 9, the side surface 46 of the adhesive tape 26 is inclined moderately as the reason why the adhesive tape 26 is prevented from overflowing when the side surface angle α of the adhesive tape 26 satisfies the range of 45 ° to 75 °. As a result, the web 14 can easily adhere not only to the adhesive layer 38 but also to the side surface 46 of the adhesive tape 26. As a result, it is considered that the gap 62 is not formed between the side surface 46 of the adhesive tape 26 and the web 14, thereby preventing the paste from protruding from the end of the adhesive tape 26. In particular, when the web 14 is wrapped on the transport roller 30, the web 14 is more easily adhered to the side surface 46 of the adhesive tape 26. Therefore, even if the glue layer 38 is sandwiched between the web 14 and the transport roller 30, the sandwiching pressure is maintained. On the contrary, it is considered that this acts in the direction of eliminating the gap 62 between the side surface 46 of the adhesive tape 26 and the web 14.
[0032]
On the other hand, when the side surface angle α is 90 ° as in the conventional adhesive tape 26, the web 14 is difficult to adhere to the side surface 46 of the adhesive tape 26 as shown in FIG. A gap 62 is formed between the side surface 46 and the web 14, and it is considered that the glue 38 </ b> A protruding from the end of the adhesive tape 26 adheres to the conveying roller 30 particularly when passing through the conveying roller 30.
[0033]
Further, when the side surface angle α of the adhesive tape 30 is less than 45 °, it is the same in the point that the web 14 easily adheres to the side surface 46 of the adhesive tape 26. However, when the side surface angle α is too small, the cutter base 52 is used. When cutting, the adhesive tape 26 is caught by the cutting blade 58 and cutting becomes impossible, and even if it is cut, the cut cross section, that is, the side surface 46 becomes uneven, and the paste easily protrudes.
[0034]
Thus, according to the coating method and the coating apparatus of the present invention, the side angle of the adhesive tape 26 parallel to the width direction of the web 14 is used as the adhesive tape 26 that joins the joint 28 of the web 14 to which the coating liquid is applied. Since the side surface 46 is cut so that the angle is in the range of 45 ° to 75 °, the adhesive is less likely to protrude from the end of the adhesive tape 26 even when the web 14 passes through the conveyance roller 30. be able to. As a result, it is possible to prevent the glue of the adhesive tape 26 from adhering to the conveying roller 30 and the like, and the adhered glue from being transferred to the downstream web 14, so that the web 14 having the adhesive tape 26 at the joining portion 28 can be prevented. It is possible to prevent coating unevenness and coating streaks from occurring when the coating liquid is applied, and to improve the coating quality.
[0035]
In addition, when the side surface angle of the adhesive tape 26 is in the range of 45 ° to 75 °, there is no occurrence of coating unevenness due to air entrainment of the joint portion 28.
[0036]
【Example】
Next, examples of the present invention will be described.
(Example 1)
Using the cutting apparatus shown in FIG. 5, both ends 2 mm of an aluminum vapor-deposited PET tape having a width of 50 mm were cut over 100 m to prepare an adhesive tape having a side surface angle α of 75 °. The joining portion of the webs was joined with this adhesive tape, and the web having the adhesive tape at the joining portion was transported at 200 m / min through the transport path shown in FIG. 1, and bead coating was performed with a slide hopper and a backup roller. . The multi-layer coating film has three layers, the total coating amount of the coating solution is 80 cc / m 2 , the lowermost layer coating solution amount is 12 cc / m 2 , the lowermost layer gelatin concentration is 5% by weight, and the lowermost layer coating is 10 (l / l The viscosity in s) was 27 mPas, and the web surface temperature was 32 ° C. The web used was a TAC film having a gelatin subbing layer on its surface.
(Example 2)
Example 1 was the same as Example 1 except that the side surface angle α of the adhesive tape was cut to 60 ° with the cutting device of FIG.
(Example 3)
The same procedure as in Example 1 was performed except that the side surface angle α of the adhesive tape was cut to 45 ° with the cutting device of FIG.
(Comparative Example 1)
Example 1 was the same as Example 1 except that a conventional adhesive tape having a side surface angle α of 90 ° was used as it was.
(Comparative Example 2)
The side surface angle α of the adhesive tape was set to 30 ° and was cut with the cutting device of FIG.
(Comparative Example 3)
Example 1 was the same as Example 1 except that the side surface angle α of the adhesive tape was cut to 90 ° with the cutting device of FIG.
(Comparative Example 4)
The same procedure as in Example 1 was performed except that the side surface angle α of the adhesive tape was cut to 135 ° with the cutting device of FIG.
[0037]
And about Examples 1-3 and Comparative Examples 1-3, while the presence or absence of the sticking out of the adhesive tape after a web passed a conveyance roller was observed with an optical microscope, application | coating of the apply | coated coating film The unevenness was observed visually. The coating unevenness was observed separately for the coating unevenness caused by the sticking out of the adhesive tape from the end of the adhesive tape and the coating unevenness due to the air entrainment at the joint. The results are shown in Table 1.
[0038]
[Table 1]
Figure 0004264789
As can be seen from the results of Examples 1 to 3 in Table 1, when the side surface angle α of the adhesive tape is in the range of 45 ° to 75 °, no adhesive sticks out from the end of the adhesive tape. It was. Thereby, not only there was no coating unevenness due to the sticking out of the glue, but also there was no coating unevenness due to air entrainment, and stable coating could be performed.
[0039]
On the other hand, in the case of Comparative Example 1 in which the conventional adhesive tape was used as it was, there was no coating unevenness due to air entrainment, but there was coating unevenness due to the sticking out of the adhesive tape end. In the case of Comparative Example 2 in which cutting was attempted with a cutting device in which the side surface angle α was set to 30 °, when the cutting was performed for 5 m, the adhesive tape was caught by the cutting blade and cutting was impossible. The comparative example 3 which cut | judged the side surface angle (alpha) of the adhesive tape to 90 degrees was the same result as the comparative example 1. FIG. Further, in Comparative Example 4 in which the side surface angle α of the adhesive tape was cut to 135 °, both application unevenness due to sticking out of the adhesive and application unevenness due to air entrainment occurred.
[0040]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent the glue from protruding from the end of the adhesive tape that joins the joints.
[0041]
As a result, when applying the coating liquid to the belt-like flexible support having the joint portion joined by the adhesive tape, it is possible to eliminate the coating unevenness caused by the sticking out of the glue, and further to the air entrainment of the joint portion. The resulting coating unevenness does not occur. Therefore, it is possible to improve the coating quality of the belt-like flexible support having the joint portion.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram schematically illustrating an example of a coating apparatus. FIG. 2 is an explanatory diagram illustrating application unevenness caused by the sticking of adhesive tape. FIG. 3 is a cross-sectional view of a conventional adhesive tape. [FIG. 5] Cross-sectional view of the adhesive tape of the present invention. [FIG. 5] An explanatory view schematically explaining the cutting device provided in the coating apparatus of the present invention. [FIG. 6] A side view of the cutter base in the cutting device. FIG. 8 is a top view of the adhesive tape being cut by the cutting device. FIG. 9 is an explanatory view for explaining the operation of the coating apparatus using the adhesive tape of the present invention. Explanatory drawing explaining the action of a coating device using tape [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Application | coating apparatus, 12 ... Slide hopper, 14 ... Web, 16 ... Multilayer coating film, 22 ... Slide surface, 26 ... Adhesive tape, 28 ... Joining part, 30 ... Conveyance roller, 32 ... Backup roller, 34 ... Bead part, 38 ... Adhesive tape adhesive layer, 40 ... Adhesive tape tape substrate, 42 ... Adhesive tape release paper, 44 ... Adhesive tape surface, 46 ... Adhesive tape side surface, 48 ... Cutting device, 50 ... Supply reel, 52 ... Cutter base, 53 ... Take-up reel, 54 ... Base of the cutter base, 56 ... Inclined surface of the cutter base, 58 ... Cutting blade of the cutter base, 62 ... Gap between the web and the conveyance roller

Claims (3)

接着テープで接合された接合部を有する帯状可撓性支持体を搬送させながら塗布液で塗布する塗布方法であって、前記帯状可撓性支持体の接合部が搬送ローラ等の搬送手段に接触経由して搬送される塗布方法において、
前記接着テープとして、糊層が形成されていない前記接着テープの表面と前記帯状可撓性支持体の幅方向に平行な前記接着テープの側面とのなす角度が45°〜75°の範囲になるように前記側面が裁断されたものを用いることを特徴とする塗布方法。
A coating method in which a belt-like flexible support having a joint joined by an adhesive tape is applied with a coating liquid while being transported, and the joint of the belt-like flexible support contacts a transport means such as a transport roller. In the coating method transported via,
As the adhesive tape, an angle formed between the surface of the adhesive tape on which no adhesive layer is formed and the side surface of the adhesive tape parallel to the width direction of the belt-like flexible support is in the range of 45 ° to 75 °. As described above, a coating method using the side surface cut as described above.
前記接合部は、前記帯状可撓性支持体の端部同士を突き合わせた状態で前記接着テープで接合されていることを特徴とする請求項の塗布方法。The coating method according to claim 1 , wherein the joining portion is joined with the adhesive tape in a state where the ends of the belt-like flexible support are abutted with each other. 接着テープで接合された接合部を有する帯状可撓性支持体を搬送させながら塗布液で塗布する塗布装置であって、前記帯状可撓性支持体の接合部が搬送ローラ等の搬送手段に接触経由して搬送される塗布装置において、前記接合部を接合する接着テープの側面を裁断する裁断手段を設けると共に、該裁断手段は、糊層が形成されていない前記接着テープの表面と前記帯状可撓性支持体の幅方向に平行な前記接着テープの側面とのなす角度が45°〜75°の範囲になるように前記側面を裁断するものであることを特徴とする塗布装置。  A coating apparatus that applies a coating solution while transporting a belt-like flexible support having a joint joined by an adhesive tape, wherein the joint of the belt-like flexible support contacts a transport means such as a transport roller. In the coating apparatus transported via, a cutting means for cutting a side surface of the adhesive tape that joins the joint portion is provided, and the cutting means is formed on the surface of the adhesive tape on which the adhesive layer is not formed and the belt-like shape. A coating apparatus, wherein the side surface is cut so that an angle formed with a side surface of the adhesive tape parallel to the width direction of the flexible support is in a range of 45 ° to 75 °.
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