JP5695163B1 - シート融着体の製造方法 - Google Patents
シート融着体の製造方法 Download PDFInfo
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- JP5695163B1 JP5695163B1 JP2013228011A JP2013228011A JP5695163B1 JP 5695163 B1 JP5695163 B1 JP 5695163B1 JP 2013228011 A JP2013228011 A JP 2013228011A JP 2013228011 A JP2013228011 A JP 2013228011A JP 5695163 B1 JP5695163 B1 JP 5695163B1
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- Health & Medical Sciences (AREA)
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Abstract
Description
複数枚のシートの縁部が重なった状態で融着したシール縁部を有するシート融着体の製造方法であって、
前記複数枚のシートの少なくとも一部のシートは樹脂材を含み、
複数枚のシートが重ねられた帯状のシート積層体の一方の面を、レーザー光が通過可能な光通過部を有する支持部材に当接させ、加圧状態となった該帯状のシート積層体に対して、該支持部材側から該光通過部を介して、該シート積層体を構成するシートに吸収され該シートを発熱させる波長のレーザー光を照射することにより、該帯状のシート積層体を分断するのと同時に、その分断によって生じた前記加圧状態にある複数枚のシートの切断縁部どうしを融着させて前記シール縁部を形成する工程を有し、
前記光通過部は、前記支持部材を厚み方向に貫通するスリット状の開口部からなり、
前記開口部は、前記シート積層体の当接面側に位置するシート当接面側開口端に比して開口幅が小さい、幅狭部を有し、該幅狭部と該シート当接面側開口端との間に、加圧により該シート当接面側開口端から該開口部内に膨出した該シート積層体の膨出部を収容可能な、空間が形成されている、シート融着体の製造方法。
前記開口部の前記幅狭部での開口幅W2と前記レーザー光のスポット径φとの比(W2/φ)は、好ましくは0.3以上、更に好ましくは0.15以上、そして、好ましくは15以下、更に好ましくは2以下、より具体的には、好ましくは0.3以上15以下、更に好ましくは0.15以上2以下である前記<1>記載のシート融着体の製造方法。
<3>
前記開口部の前記幅狭部での開口幅W2は、前記レーザー光のスポット径φに比して小さい前記<1>記載のシート融着体の製造方法。
<4>
前記開口部の前記シート当接面側開口端での開口幅W1は、前記レーザー光のスポット径φと同じである前記<2>又は<3>記載のシート融着体の製造方法。
<5>
前記レーザー光のスポット径φ及び前記開口部の各部の開口幅W1,W2のうち、開口幅W2が最小である前記<2>〜<4>の何れか一項に記載のシート融着体の製造方法。
<6>
前記開口部の前記シート当接面側開口端での開口幅W1と前記レーザー光のスポット径φとの比(W1/φ)は、好ましくは0.15以上、更に好ましくは0.3以上、そして、好ましくは15以下、更に好ましくは2以下、より具体的には、好ましくは0.15以上15以下、更に好ましくは0.3以上2以下である前記<2>〜<5>の何れか一項に記載のシート融着体の製造方法。
<7>
前記レーザー光のスポット径φ及び前記開口部の各部の開口幅W1,W2の大小関係は、スポット径φ>開口幅W1>開口幅W2である前記<2>〜<6>の何れか一項に記載のシート融着体の製造方法。
<8>
前記支持部材は、前記開口部では前記レーザー光を通過させる一方、該開口部以外の部分ではレーザー光を通過させない前記<1>〜<7>の何れか一項に記載のシート融着体の製造方法。
前記支持部材の少なくとも前記レーザー光が照射される面は、該レーザー光の吸収性が低いレーザー光低吸収性材料を含んで形成されている前記<1>〜<8>の何れか一項に記載のシート融着体の製造方法。
<10>
前記レーザー光低吸収性材料は、CO2レーザー波長に対し吸収性が低い材料であり、銅、アルミニウム、銀及び金からなる群から選択される1種以上である前記<9>記載のシート融着体の製造方法。
<11>
前記支持部材は、その全体が前記レーザー光低吸収性材料から形成されている前記<9>又は<10>記載のシート融着体の製造方法。
<12>
前記支持部材は、前記レーザー光低吸収性材料ではない耐熱性材料からなる基体と、該基体における前記レーザー光の被照射面となる面上に設けられた前記レーザー光低吸収性材料からなる層と含んで構成されている前記<9>又は<10>記載のシート融着体の製造方法。
前記レーザー光は、該レーザー光を走査させつつ前記シート積層体に照射させた際に、走査方向と直交する方向の任意の該シート積層体断面に加わるエネルギーを時間積分したエネルギー分布がフラットであるレーザー光である前記<1>〜<12>の何れか一項に記載のシート融着体の製造方法。
<14>
前記エネルギー分布がフラットであるレーザー光は、スポットのエネルギー分布がトップハット分布である前記<13>記載のシート融着体の製造方法。
<15>
スポット及び走査時のエネルギー分布がそれぞれトップハット分布である前記レーザー光は、該エネルギー分布がガウス分布であるレーザー光を、ホモジェナイザーを用いてトップハット分布に変換することで得られたものである前記<14>記載のシート融着体の製造方法。
<16>
前記エネルギー分布がフラットであるレーザー光は、スポットのエネルギー分布がアキシコン分布である前記<13>記載のシート融着体の製造方法。
<17>
スポット及び走査時のエネルギー分布がそれぞれアキシコン分布である前記レーザー光は、該エネルギー分布がガウス分布であるレーザー光を、アキシコンレンズを用いてアキシコン分布に変換することで得られたものである前記<16>記載のシート融着体の製造方法。
前記<1>〜<17>の何れか一項に記載の製造方法により前記シート融着体を製造する工程を含む、吸収性物品の製造方法。
<19>
前記吸収性物品は、吸収性本体と、該吸収性本体の非肌当接面側に配されて該吸収性本体を固定している外装体とを備え、且つ腹側部における該外装体の両側縁部と背側部における該外装体の両側縁部とが接合されて一対のサイドシール部が形成されているパンツ型使い捨ておむつであり、
帯状の前記外装体をその幅方向に折り畳み、折り畳まれた該外装体の所定箇所に前記レーザー光を照射することにより、帯状の該外装体を分断するのと同時に前記サイドシール部を形成して前記シート融着体とする、前記<18>記載の吸収性物品の製造方法。
<20>
前記吸収性物品は、前記腹側部における前記外装体の両側縁部と前記背側部における該外装体の両側縁部とが接合されて一対の前記サイドシール部と共に、ウエスト開口部及び一対のレッグ開口部が形成されているパンツ型使い捨ておむつである前記<19>記載の吸収性物品の製造方法。
前記帯状のシート積層体に対して、レーザー式接合装置を用いてレーザー光を照射して、前記一対のサイドシール部を有する前記外装体を具備するパンツ型使い捨ておむつを連続的に製造する前記<18>〜<17>の何れか一項に記載の吸収性物品の製造方法。
<22>
前記レーザー式接合装置は、回転駆動される環状の前記支持部材を備えた中空の円筒ロールと、該円筒ロールの中空部に配され、レーザー光を照射する照射ヘッドと、加圧装置とを備えている前記<21>記載の吸収性物品の製造方法。
<23>
前記加圧装置は、無端状の加圧ベルト(押さえ部材)及び該加圧ベルトが架け渡された状態で回転する複数本のロールを備えたベルト式加圧装置である前記<22>記載の吸収性物品の製造方法。
<24>
前記加圧ベルトは、鉄、アルミニウム及びステンレス鋼からなる群から選択される1種以上の金属材料からなる前記<23>記載の吸収性物品の製造方法。
<25>
前記加圧ベルトは、前記帯状のシート積層体に対して照射されるレーザー光の透過性を有しない前記<23>又は<24>記載の吸収性物品の製造方法。
<26>
前記支持部材及び前記加圧ベルトの温度を空冷又は水冷により所定の温度範囲に維持する前記<23>〜<25>の何れか一項に記載の吸収性物品の製造方法。
<27>
前記レーザー式接合装置は、環状の前記支持部材の外周面(前記円筒ロールの周面部)に巻き掛ける前記加圧ベルトの張力を増減調整できる張力調整機構を備え、該張力の調整により、該支持部材と該加圧ベルトとによって、前記帯状のシート積層体に加える圧力を調整可能になされている前記<23>〜<26>の何れか一項に記載の吸収性物品の製造方法。
<28>
前記照射ヘッドは、レーザー光を自在に走査可能な、モータ軸にミラーが付いた装置であり、1)レーザー光を前記円筒ロールの回転軸と平行な方向に進退させる機構、2)レーザー光が前記支持部材上の前記帯状のシート積層体に当たる位置(照射点)を該円筒ロールの周方向に移動させる機構、及び3)該円筒ロールの周面上でレーザー光のスポット径を一定にする機構を備えている前記<22>〜<27>の何れか一項に記載の吸収性物品の製造方法。
前記サイドシール部の延びる方向と直交する方向(前記吸収性物品の幅方向)の断面視において、レーザー光の照射による前記帯状のシート積層体の分断によって生じた該サイドシール部の外縁が、前記外装体(前記シート融着体)の内方に向かって凸の弧状をなし、且つ該外縁を含んでそれよりも該外装体の内方に、該外装体を構成する複数枚のシートどうしの融着部が形成されている前記<19>〜<28>の何れか一項に記載の吸収性物品の製造方法。
<30>
前記融着部は、前記外装体の厚み方向の中央部が両端部に比して幅が広い前記<29>記載の吸収性物品の製造方法。
<31>
前記融着部は、前記吸収性物品の幅方向(レーザー光による分断方向と直交する方向)の断面視において、その端部から中央部に向かって該融着部の幅が徐々に大きくなっている前記<29>又は<30>記載の吸収性物品の製造方法。
<32>
前記融着部は、前記吸収性物品の幅方向(レーザー光による分断方向と直交する方向)の断面視において三日月状又は半月状に形成されている前記<29>〜<31>の何れか一項に記載の吸収性物品の製造方法。
<33>
前記吸収性物品を構成するシート融着体は、a)該吸収性物品の肌当接面を形成する表面シートと非肌当接面を形成する裏面シートとが、吸収体の周縁部より延出した部分で接合されているものであるか、又はb)該吸収性物品(生理用ナプキン)における、表面シートとウイング部形成用シート、該ウイング部形成用シートと裏面シート、該表面シートと該ウイング部形成用シートと裏面シート、が融着したものである前記<18>〜<32>の何れか一項に記載の吸収性物品の製造方法。
1A 腹側部
1B 背側部
2 吸収性本体
3 外装体(シート融着体)
31 外層シート
32 内層シート
4 サイドシール部(シール縁部)
40 融着部
10 おむつ連続体(帯状のシート積層体)
10C 分断予定部分
10P 膨出部
20 レーザー式接合装置
21 支持部材
24 加圧ベルト(押さえ部材)
27,27A,27B 開口部(光通過部)
27a 開口部のシート当接面側開口端
27b 開口部のレーザー光照射側開口端
27c 幅狭部
27S 空間
30,30A,30B レーザー光
Claims (6)
- 複数枚のシートの縁部が重なった状態で融着したシール縁部を有するシート融着体の製造方法であって、
前記複数枚のシートの少なくとも一部のシートは樹脂材を含み、
複数枚のシートが重ねられた帯状のシート積層体の一方の面を、レーザー光が通過可能な光通過部を有する支持部材に当接させ、加圧状態となった該帯状のシート積層体に対して、該支持部材側から該光通過部を介して、該シート積層体を構成するシートに吸収され該シートを発熱させる波長のレーザー光を照射することにより、該帯状のシート積層体を分断するのと同時に、その分断によって生じた前記加圧状態にある複数枚のシートの切断縁部どうしを融着させて前記シール縁部を形成する工程を有し、
前記光通過部は、前記支持部材を厚み方向に貫通するスリット状の開口部からなり、
前記開口部は、前記シート積層体の当接面側に位置するシート当接面側開口端に比して開口幅が小さい、幅狭部を有している、シート融着体の製造方法。 - 前記開口部の前記幅狭部での開口幅は、前記レーザー光のスポット径に比して小さい請求項1記載のシート融着体の製造方法。
- 前記支持部材の少なくとも前記レーザー光が照射される面は、該レーザー光の吸収性が前記シートよりも低いレーザー光低吸収性材料を含んで形成されている請求項1又は2記載のシート融着体の製造方法。
- 前記レーザー光は、該レーザー光を走査させつつ前記シート積層体に照射させた際に、走査方向と直交する方向の任意の該シート積層体断面に加わるエネルギーを時間積分したエネルギー分布がフラットであるレーザー光である請求項1〜3の何れか一項に記載のシート融着体の製造方法。
- 請求項1〜4の何れか一項に記載の製造方法により前記シート融着体を製造する工程を含む、吸収性物品の製造方法。
- 前記吸収性物品は、吸収性本体と、該吸収性本体の非肌当接面側に配されて該吸収性本体を固定している外装体とを備え、且つ腹側部における該外装体の両側縁部と背側部における該外装体の両側縁部とが接合されて一対のサイドシール部が形成されているパンツ型使い捨ておむつであり、
帯状の前記外装体をその幅方向に折り畳み、折り畳まれた該外装体の所定箇所に前記レーザー光を照射することにより、帯状の該外装体を分断するのと同時に前記サイドシール部を形成して前記シート融着体とする、請求項5記載の吸収性物品の製造方法。
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