JP5731617B2 - シート融着体の製造方法及びシート接合装置 - Google Patents
シート融着体の製造方法及びシート接合装置 Download PDFInfo
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Description
また本発明は、前記製造方法に用いられるシート接合装置であって、貫通口を有する環状の支持部材を含んで構成され、複数枚のシートが重ねられた帯状のシート積層体を該支持部材の周面に沿わせた状態で回転する中空の回転ロールと、前記シート積層体を前記回転ロールの周面に押し付ける押さえ部材を含んで構成される加圧機構と、前記回転ロールの中空部に配され、該回転ロールの周面部を形成する前記支持部材の前記貫通口の内外を移動可能な溶断具を含んで構成される溶断機構とを備えるシート接合装置を提供するものである。
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、貫通口を有する支持部材に該貫通口と重なるように当接させ、押さえ部材で押し付けることで加圧状態となった該帯状のシート積層体に、該貫通口から挿入した溶断具を押し当てることにより、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する、シート融着体の製造方法。
<2>
前記溶断具は、加熱刃、抵抗発熱体又は超音波刃である前記<1>記載のシート融着体の製造方法。
<3>
前記支持部材に当接している前記帯状のシート積層体の他方の面に、押さえ部材を押し付け、その状態の該帯状のシート積層体に対して、前記貫通口から挿入した前記溶断具を押し当てる前記<1>又は<2>記載のシート融着体の製造方法。
前記シートに含まれる樹脂材は、ポリエチレン、ポリエチレンテレフタレート及びポリプロピレンからなる群から選択される1種以上の熱融着性合成樹脂である前記<1>〜<3>の何れか一項に記載のシート融着体の製造方法。
<5>
前記シートは、不織布、フィルム又は不織布とフィルムとのラミネートシートからなる前記<1>〜<4>の何れか一項に記載のシート融着体の製造方法。
<6>
前記シート積層体は、厚み方向に加圧されたときに厚みが変化するシートを含む前記<1>〜<5>の何れか一項に記載のシート融着体の製造方法。
<7>
前記シート積層体は、伸縮性を有するシートを含む前記<1>〜<5>の何れか一項に記載のシート融着体の製造方法。
前記<1>〜<7>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。
<9>
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対して、前記貫通口から挿入した前記溶断具を押し当てることにより、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<8>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の断面視において、該サイドシール部の外縁は、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3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<9>記載の吸収性物品の製造方法。
<11>
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<9>又は<10>記載の吸収性物品の製造方法。
<12>
前記融着部は、前記吸収性物品の幅方向(前記溶断具による帯状の前記外装体の分断方向と直交する方向)の断面視において、着用者の肌に近い側から遠い側に向かう内外方向と直交する方向の、該融着部の端部から中央部に向かって、該内外方向の長さが徐々に大きくなっている前記<10>又は<11>記載の吸収性物品の製造方法。
<13>
前記融着部は、前記吸収性物品の幅方向(前記溶断具による帯状の前記外装体の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<10>〜<12>の何れか一項に記載の吸収性物品の製造方法。
<14>
帯状の前記外装体の形成工程を有し、該工程において、帯状の外層シートと帯状の内層シートとの間にウエスト部弾性部材、胴回り部弾性部材及びレッグ部弾性部材を伸長状態で挟み込んでこれらを加圧する前記<9>〜<13>の何れか一項に記載の吸収性物品の製造方法。
<15>
前記吸収性物品の前記腹側部(前見頃)と前記背側部(後見頃)とで、前記ウエスト部弾性部材又は前記外装体(前記外層シート、前記内層シート)の色が異なっている前記<14>記載の吸収性物品の製造方法。
前記<1>〜<15>の何れか一項に記載の製造方法に用いられるシート接合装置であって、
貫通口を有する環状の支持部材を含んで構成され、複数枚のシートが重ねられた帯状のシート積層体を該支持部材の周面に沿わせた状態で回転する中空の回転ロールと、
前記シート積層体を前記回転ロールの周面に押し付ける押さえ部材を含んで構成される加圧機構と、
前記回転ロールの中空部に配され、該回転ロールの周面部を形成する前記支持部材の前記貫通口の内外を移動可能な溶断具を含んで構成される溶断機構と
を備えるシート接合装置。
<17>
前記溶断具は、不使用時には、その先端部が、前記回転ロールの周面部を形成する前記支持部材から前記シート接合装置の内方に所定距離離間した位置にある、所定の待機位置に存し、使用時には、該待機位置から該支持部材の前記貫通口に向かって移動してその内部に進入し、少なくとも該溶断具の先端部が、該貫通口を通り抜けて該支持部材の外周面から外方に突出し、それによって、該支持部材の外周面に沿わせた状態の帯状の前記シート積層体を溶断可能になされており、その溶断終了後には、逆方向に移動して所定の待機位置に戻るようになされている前記<16>記載のシート接合装置。
<18>
前記溶断具による帯状の前記シート積層体の溶断によって生じた複数枚のシートの切断縁部を強制的に冷却する冷却手段を備え、該冷却手段は、吸引装置又は排気装置である前記<16>又は<17>記載のシート接合装置。
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
20 シート接合装置
21 支持部材
21H 貫通口
21D 凹部
23 回転ロール
24 加圧ベルト(押さえ部材)
26 加圧機構
27 溶断具(加熱刃)
28 回転体
29 溶断機構
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は、伸縮性を有するシートを含み、
所定のテンションが掛けられた状態の前記帯状のシート積層体の一方の面を、貫通口を有する支持部材に該貫通口と重なるように当接させ、押さえ部材で押し付けることで加圧状態となった該帯状のシート積層体に、該貫通口から挿入した溶断具を押し当てることにより、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する、シート融着体の製造方法。 - 前記溶断具は、加熱刃、抵抗発熱体又は超音波刃である請求項1記載のシート融着体の製造方法。
- 前記支持部材に当接している前記帯状のシート積層体の他方の面に、押さえ部材を押し付け、その状態の該帯状のシート積層体に対して、前記貫通口から挿入した前記溶断具を押し当てる請求項1又は2記載のシート融着体の製造方法。
- 請求項1〜3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対して、前記貫通口から挿入した前記溶断具を押し当てることにより、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4記載の吸収性物品の製造方法。 - 請求項1〜5の何れか一項に記載の製造方法に用いられるシート接合装置であって、
貫通口を有する環状の支持部材を含んで構成され、複数枚のシートが重ねられた帯状のシート積層体を該支持部材の周面に沿わせた状態で回転する中空の回転ロールと、
前記シート積層体を前記回転ロールの周面に押し付ける押さえ部材を含んで構成される加圧機構と、
前記回転ロールの中空部に配され、該回転ロールの周面部を形成する前記支持部材の前記貫通口の内外を移動可能な溶断具を含んで構成される溶断機構と
を備えるシート接合装置。
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