JP7287450B1 - ポリエステルからなる延伸フィルム及びその改質処理方法 - Google Patents
ポリエステルからなる延伸フィルム及びその改質処理方法 Download PDFInfo
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Abstract
Description
フィルムの表面に赤外域波長のレーザー光が照射されたヒートシール領域を有する延伸ポリエステルフィルムを備え、前記ヒートシール領域は、前記レーザー光が照射された面側からフィルム厚み方向に向けて、ヒートシール前駆部、中間部、非改質部が順に形成されており、前記ヒートシール前駆部の複屈折度が5×10-3以下であり、前記中間部の厚みが2μm以下であり、前記非改質部の複屈折度が、前記レーザー光の未照射部に対して20%以下の変化率であることを特徴とする延伸フィルム。
また、透過度Tは、T=I/I0
吸光度E=-logT=log(I0/I)となるので、
減衰係数μは、μ=E/d
延伸フィルム1として、図3に示す積層フィルムを用意した。この積層フィルムは、厚さ12μmの2軸延伸PETフィルム10を、ポリウレタン接着剤11を用いて厚さ7μmのアルミニウム箔12の両面にラミネートした積層体である。この積層フィルムに対して、下記の改質処理方法にて処理を行うことで、2軸延伸PETフィルム10にヒートシール領域(処理部)1Aを形成した。また、ヒートシール領域1Aにおけるヒートシール前駆部T1、中間部T2、非改質部T3の各層の厚み及び複屈折度を、下記方法にて測定して算出した。
レーザー光の光源として、赤外域の波長9.3μm(減衰係数0.035μm-1)のレーザー光を出射する炭酸ガスレーザー発振装置(CO2レーザー)を用いて、出力100W、照射表面上のスポット径が約1mm、走査速度11000~24000mm/sec、走査線間隔(スポット径の中心間距離)0.2~0.7mmにて、レーザー光を延伸フィルム1における2軸延伸PETフィルム10の表面に照射し、未処理部が存在しない、幅100mm、長さ10mmのヒートシール領域1Aを形成した。
複屈折度の算出にあたり、ミクロトームを用いてヒートシール領域1Aから切片厚5μmのサンプル片を切削し、ティルティングコンペンセータを導入した偏光顕微鏡(カールツァイス社製;Axioplan2 imaging)を用いてリタデーション値の測定を行なった。
回転ステージで測定する層(例えばヒートシール前駆部T1)が最も明るく見える位置(対角位)に設定し、コンペンセータの目盛りを回して測定する層のリタデーションとコンペンセータのリタデーションが打ち消し合い、最も暗く見える角度値を読み取り、角度値に対応するリタデーション値を得た。この操作をヒートシール領域1Aにおけるヒートシール前駆部T1、中間部T2、非改質部T3のそれぞれで行い、各々のリタデーション値を得た。得られたリタデーション値に基づいて、複屈折度を下記式にて算出した。
複屈折度(Δn)=R/d(R:リタデーション、d:切片厚)
また、リタデーション値を測定する際に、各層(例えばヒートシール前駆部T1)が暗く見える範囲を各層の厚みとして測長を行ない、ヒートシール前駆部厚み、中間部厚み、非改質部厚みをそれぞれ測定した。
フーリエ変換赤外分光光度計(FTIR、VARIAN社製;FTS7000)を用いて測定した12μm厚の2軸延伸PETフィルムの赤外スペクトルにより、9.3μm波長、10.6μm波長に当たる943cm-1、1075cm-1の吸光度Aを求め、光の透過率%Tを%T=10-Aから算出した。光減衰率%Eは、%E=100-%Tで求められ、表1に示した。
ヒートシール領域1Aが形成された延伸フィルム1のサンプルを2枚用意し、ヒートシール領域1Aを重ねて、ヒートシールバー温度180℃、加熱時間1秒、ヒートシール圧力0.2MPaの条件でヒートシールして得られた試料から、15mm巾の短冊を5点切り出し、テンシロン万能試験機(オリエンテック社製;UCT-5T)を用いてTピール法により引張速度300mm/分にてシール強度を測定し、上記5点の平均値から算出した。
下記の改質処理方法を採用した以外は、実施例と同様にヒートシール領域を有する延伸フィルムを得た。
レーザー光の光源として、波長10.6μmの炭酸ガスレーザー発振装置(CO2レーザー)を用いて、出力30W、照射表面上のスポット径約1mm、走査速度1528~1910mm/sec、走査線間隔(スポット径の中心間距離)0.7mmにて、レーザー光を延伸フィルムの表面に照射し、幅100mm、長さ10mmのヒートシール領域を形成した。
T1:ヒートシール前駆部,T2:中間部,T3:非改質部,
10:2軸延伸PETフィルム,11:ポリウレタン接着剤,
12:アルミニウム箔
Claims (5)
- フィルムの表面に赤外域波長のレーザー光が照射されたヒートシール領域を有する延伸ポリエステルフィルムを備え、
前記ヒートシール領域は、前記レーザー光が照射された面側からフィルム厚み方向に向けて、ヒートシール前駆部、中間部、非改質部が順に形成されており、
前記ヒートシール前駆部の複屈折度が5×10-3以下であり、
前記中間部の厚みが2μm以下であり、
前記非改質部の複屈折度が、前記レーザー光の未照射部に対して20%以下の変化率であることを特徴とする延伸フィルム。 - 前記ヒートシール前駆部の厚みが前記フィルムの全体の厚みの1%以上60%以下であることを特徴とする、請求項1記載の延伸フィルム。
- 前記延伸ポリエステルフィルムは、延伸ポリエチレンテレフタレートフィルムである請求項1記載の延伸フィルム。
- 前記延伸フィルムを、前記ヒートシール前駆部が露出するようにして、他のフィルムと積層している、請求項1記載の延伸フィルム。
- フィルムの表面の全面或いは一部に赤外域波長のレーザー光を照射してヒートシール領域を形成する処理方法であって、
前記レーザー光として、減衰係数が0.02μm-1以上を示すレーザー光を用いることを特徴とする延伸ポリエステルフィルムの処理方法。
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JP2017052103A (ja) | 2015-09-07 | 2017-03-16 | 凸版印刷株式会社 | フィルムへのレーザー加工方法 |
JP2018188593A (ja) | 2017-05-11 | 2018-11-29 | 凸版印刷株式会社 | フィルムの加工方法 |
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