JPWO2016185999A1 - 伸縮積層シートおよび使い捨て着用物品 - Google Patents
伸縮積層シートおよび使い捨て着用物品 Download PDFInfo
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- 229920006302 stretch film Polymers 0.000 claims description 6
- 238000003466 welding Methods 0.000 description 19
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- 230000035699 permeability Effects 0.000 description 5
- 240000006829 Ficus sundaica Species 0.000 description 2
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- 210000003739 neck Anatomy 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
Description
不織布と伸縮フィルムとを積層するための構造としては、例えば円形の溶着部や長細い溶着部を所定のパターンで多数配置している(特許文献1)。
前記不織布と前記伸縮フィルムとが複数の第1および第2溶着部で互いに溶着され、
前記第1溶着部は第1方向に長い第1長さを有し、かつ、前記第1方向に直交する第2方向に前記第1長さよりも短い第1幅を有し、
前記第2溶着部は前記第1方向に交差する第3方向に長い第2長さを有し、かつ、前記第3方向に直交する第4方向に前記第2長さよりも短い第2幅を有する。
第1溶着部の長手方向である第1方向に直交する第2方向に張力が付与されると、第1溶着部の縁においてフィルムが引っ張られ同フィルムに開孔が形成され易い。第1溶着部に第1方向の張力が付与されると、第1溶着部の縁においてフィルムに開孔が形成され難い。すなわち、第1溶着部に働く張力の方向が、長手方向に直交する第2方向に近いほど、第1溶着部の縁のうち第1方向に沿った広い範囲に大きな力が作用する。
たとえば、前記第2方向に張力が付与された際に前記第1溶着部の長手方向の縁に沿った部位のフィルムに開孔が形成され易く、かつ、大きな開孔が形成され易い。
第2溶着部の長手方向である第3方向に直交する第4方向に張力が付与されると、第2溶着部の縁においてフィルムが引っ張られ同フィルムに開孔が形成され易い。第2溶着部に第3方向の張力が付与されると、第2溶着部の縁においてフィルムに開孔が形成され難い。
前記第1方向に交差する前記第3方向に長手方向を有する前記第2溶着部において、前記長手方向が前記第1方向に直交する方向(前記第2方向)に近いほど、前記第2方向に張力が付与された際に前記第2溶着部に働く張力の前記第1方向に沿った範囲が小さくなる。したがって、前記第2方向に張力が付与された際に前記第2溶着部の長手方向に沿った部位のフィルムに開孔が形成され難く、かつ、大きな開孔が形成され難い。
本発明において、伸縮積層シートの前記開孔は製品の製造時に形成されてもよいし、製品の使用時、たとえば着用物品の着用時に形成されてもよい。
前記胴回り部は下縁部と、上縁部と、前記下縁部および上縁部の間の中間部とを備え、
前記下縁部および前記中間部とに前記複数の第1溶着部が複数設けられ、
前記上縁部には前記複数の第2溶着部が設けられ、
前記複数の第1溶着部は、前記胴回り方向に間欠的に配置され、かつ、前記縦方向に間欠的に配置され、
前記複数の第2溶着部は、前記胴回り方向に間欠的に配置され、かつ、前記縦方向に間欠的に配置され、
前記複数の第1溶着部は前記胴回り方向に直交する縦方向の長さが、前記胴回り方向の長さよりも長く、
前記複数の第2溶着部は前記胴回り方向の長さが、前記縦方向の長さよりも長い。
前記重なり部において前記不織布と前記伸縮フィルムとが複数の第3溶着部で互いに溶着され、
前記第3溶着部は第1方向である前記縦方向に長い第3長さを有し、かつ、前記第2方向である胴回り方向に前記第3長さよりも短い第3幅を有し、
前記第3溶着部の前記第3長さが前記第1溶着部の第1長さよりも長い。
この場合、第1幅よりも小さい第3幅は第3溶着部の面積が大きくなるのを抑制する。そのため、重なり部の第3溶着部は重なり部の隣の第1溶着部に対し、溶着時のエネルギーの著しく大きな変化が生じにくく、例えば第3溶着部の超音波溶着が行われ易い。
この場合、第1長さの比よりも大きい第3長さの比は、第3溶着部の面積が大きくなるのを抑制する。そのため、同様に、第3溶着部の超音波溶着が行われ易い。
前記重なり部において前記不織布と前記伸縮フィルムとが複数の第3溶着部で互いに溶着され、
前記第1溶着部が設けられた第1領域と前記第3溶着部が設けられた第3領域との間に、第4領域が配置され、前記第4領域において、前記不織布と前記伸縮フィルムとが複数の第4溶着部で互いに溶着され、
前記第4領域の面積に対する前記複数の第4溶着部の総面積の比が、前記第1領域の面積に対する前記複数の第1溶着部の総面積の比よりも大きく、かつ、前記第3領域の面積に対する前記複数の第3溶着部の総面積の比よりも小さい。
本伸縮積層シートは、種々の用途に用いることができる。以下、本伸縮積層シートを使い捨てオムツに適用した場合について例示して説明する。前記オムツは、着用者の胴を覆う胴回り部と、着用者の股間を覆う股部とを備えている。前記伸縮積層シートは、前記胴回り部に用いられる。
図1Bにおいて、フィルムFは一対のニップロールR1,R2に挟まれて、これらの間からアンビルロールR3に向かって供給される。一方、一対の不織布NWは前記伸縮フィルムFを挟むように前記アンビルロールR3に巻き付く。3枚に重なったシート状物には超音波ホーン100から振動エネルギーが付与される。前記アンビルロールR3の表面に形成された図2Aの溶着パターンに合致した形状や配置の凸部において、前記シート状物が互いに溶着(シール)される。
この図に示すように、前記多角形としては四角形と八角形とが縦横に、かつ、交互に配置されたパターンであってもよい。
図4Aおよび図4Bは着用物品を示す。
これらの図に示すように、着用物品10は、吸収性本体20および胴回り部30を備えている。前記吸収性本体20は、前記胴回り方向Xに直交する縦方向Yに延びる。着用物品10は図4Aのオムツ型であってもよいし、図4Bのパンツ型であってもよい。
この例の場合、第1溶着部1には図3の破線で示したような開孔Hが着用時に形成される。
この例の場合、図6Aの前記重なり部34において図1Aの前記不織布NWと前記伸縮フィルムFとが図6Aの複数の第3溶着部3で互いに溶着されている。重なり部34は下縁部31および中間部33の胴回り方向Xの中央に設けられている。
この例の場合、以下に説明するように各溶着部の面積比が胴回り方向Xに沿って徐々に変化するように構成されている。
なお、図9Aから分かるように、第4溶着部4を2種類設け、前記面積比がより段階的に変化するようにしてもよい。
図7Aの各領域の前記比C1,C3,C4について例えば下記の各式で定義されてもよい。
1.0%<C1<4.0% …(71)
4.0%<C4<6.0% …(74)
6.0%<C3<10% …(73)
図9Aの各領域の前記比C1,C3,C4について例えば下記の各式で定義されてもよい。
1.0%<C1<5.0% …(91)
5.0%<C4<20% …(94)
20%<C3<30% …(93)
第1および第2溶着部の形状は互いに異なっていてもよい。第1溶着部の第1長さと第2溶着部の第2長さとは同じ大きさであってもよいし、互いに異なる大きさであってもよい。第1溶着部の第1幅と第2溶着部の第2幅とは同じ大きさであってもよいし、互いに異なる大きさであってもよい。また、各溶着部の形状は長円形状ではなく楕円形などであってもよい。また、多角形は実施例に示した正多角形でもよいし、正多角形でなくてもよい。
A1〜A4:第1〜第4領域
NW:不織布 F:伸縮フィルム S:伸縮積層シート
D1:第1方向 D2:第2方向 D3:第3方向 D4:第4方向 MD:搬送方向
E1:長縁 H:開孔
L1:第1長さ L2:第2長さ L3:第3長さ W1:第1幅 W2:第2幅
W3:第3幅
R1,R2:ニップロール R3:アンビルロール
X:胴回り方向 Y:縦方向
20:吸収性本体 30:胴回り部
31:下縁部 32:上縁部 33:中間部 34:重なり部
Claims (8)
- 熱可塑性繊維を含む不織布に熱可塑性の伸縮フィルムが積層された伸縮積層シートであって、
前記不織布と前記伸縮フィルムとが複数の第1および第2溶着部で互いに溶着され、
前記第1溶着部は第1方向に長い第1長さを有し、かつ、前記第1方向に直交する第2方向に前記第1長さよりも短い第1幅を有し、
前記第2溶着部は前記第1方向に交差する第3方向に長い第2長さを有し、かつ、前記第3方向に直交する第4方向に前記第2長さよりも短い第2幅を有する、伸縮積層シート。 - 請求項1において、
前記第1および第2溶着部は、仮想の四角形以上の多角形の角を除く前記多角形の辺に沿って配置され、かつ、前記多角形の角および前記第1および第2溶着部に囲まれた領域は前記不織布と前記伸縮フィルムとが溶着されていない非溶着部である伸縮積層シート。 - 請求項2において、
前記仮想の多角形が四角形、六角形または八角形、あるいは、これらの組合せである伸縮積層シート。 - 請求項1の前記伸縮積層シートを含む使い捨て着用物品であって、
前記伸縮積層シートにより形成され着用者の胴回り方向に延び着用者の胴を覆うように構成された胴回り部と、前記着用者の股間を覆うように構成された吸収性本体とを備え、
前記胴回り部は下縁部と、上縁部と、前記下縁部および上縁部の間の中間部とを備え、
前記下縁部および前記中間部とに前記複数の第1溶着部が複数設けられ、
前記上縁部には前記複数の第2溶着部が設けられ、
前記複数の第1溶着部は、前記胴回り方向に間欠的に配置され、かつ、前記縦方向に間欠的に配置され、
前記複数の第2溶着部は、前記胴回り方向に間欠的に配置され、かつ、前記縦方向に間欠的に配置され、
前記複数の第1溶着部は前記胴回り方向に直交する縦方向の長さが、前記胴回り方向の長さよりも長く、
前記複数の第2溶着部は前記胴回り方向の長さが、前記縦方向の長さよりも長い、使い捨て着用物品。 - 請求項4において、
前記胴回り部は前記吸収性本体が重なる重なり部を有し、
前記重なり部において前記不織布と前記伸縮フィルムとが複数の第3溶着部で互いに溶着され、
前記第3溶着部は第1方向である前記縦方向に長い第3長さを有し、かつ、前記第2方向である胴回り方向に前記第3長さよりも短い第3幅を有し、
前記第3溶着部の前記第3長さが前記第1溶着部の第1長さよりも長いことを特徴とする、使い捨て着用物品。 - 請求項5において、
前記第3溶着部の第3幅が前記第1溶着部の第1幅よりも小さいことを特徴とする、使い捨て着用物品。 - 請求項5において、
前記第3溶着部の前記第3幅に対する前記第3長さの比が前記第1溶着部の第1幅に対する第1長さの比よりも大きいことを特徴とする、使い捨て着用物品。 - 請求項4において、
前記胴回り部は前記吸収性本体が重なる重なり部を有し、
前記重なり部において前記不織布と前記伸縮フィルムとが複数の第3溶着部で互いに溶着され、
前記第1溶着部が設けられた第1領域と前記第3溶着部が設けられた第3領域との間に、第4領域が配置され、前記第4領域において、前記不織布と前記伸縮フィルムとが複数の第4溶着部で互いに溶着され、
前記第4領域の面積に対する前記複数の第4溶着部の総面積の比が、前記第1領域の面積に対する前記複数の第1溶着部の総面積の比よりも大きく、かつ、前記第3領域の面積に対する前記複数の第3溶着部の総面積の比よりも小さいことを特徴とする、使い捨て着用物品。
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WO2016185999A1 (ja) | 2016-11-24 |
EP3299161A1 (en) | 2018-03-28 |
CN107428118B (zh) | 2020-07-03 |
EP3299161B1 (en) | 2021-06-23 |
EP3875265A1 (en) | 2021-09-08 |
EP3875265C0 (en) | 2024-01-10 |
CN107428118A (zh) | 2017-12-01 |
EP3299161A4 (en) | 2019-01-16 |
JP6730984B2 (ja) | 2020-07-29 |
US20180042784A1 (en) | 2018-02-15 |
EP3875265B1 (en) | 2024-01-10 |
US10617573B2 (en) | 2020-04-14 |
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