JP5309022B2 - シート状部材の積層体 - Google Patents
シート状部材の積層体 Download PDFInfo
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- JP5309022B2 JP5309022B2 JP2009516215A JP2009516215A JP5309022B2 JP 5309022 B2 JP5309022 B2 JP 5309022B2 JP 2009516215 A JP2009516215 A JP 2009516215A JP 2009516215 A JP2009516215 A JP 2009516215A JP 5309022 B2 JP5309022 B2 JP 5309022B2
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- sheet
- hole
- embossed
- recess
- longitudinal direction
- Prior art date
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- Expired - Fee Related
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Landscapes
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Description
複数の貫通孔を有し、各貫通孔の長手方向が互いに同じ方向である第1シート状部材と、
前記第1シート状部材に重ね合わされる第2シート状部材と、
前記第1シート状部材及び前記第2シート状部材の少なくとも一方に形成されて前記第1シート状部材と前記第2シート状部材とを接合する複数の接合凹部であって、各接合凹部の長手方向が前記各貫通孔の長手方向に対して傾いている複数の接合凹部と、
を備え、
前記第1シート状部材及び前記第2シート状部材は熱可塑性繊維を含む不織布であり、
前記第1シート状部材と前記第2シート状部材とは、前記接合凹部において溶着されており、
前記第1シート状部材において、前記各貫通孔の長手方向に配向した繊維よりも、前記各貫通孔の長手方向と直交する方向に配向した繊維の方が少ないことを特徴とするシート状部材の積層体である。
11 第1シート状部材、11a 表面、11b 裏面、
11w ウエブ、11wf 第1シート状部材、
12 貫通孔、13 溝部、14 山部、
21 第2シート状部材、21a 表面、21b 裏面、
31 エンボス凹部(接合凹部)、31a 底部、31e 端部、31p 部分、
31v 先端の尖った部分、31s 開始点、31r エンボス凹部列、
31w 線分、
33 低圧縮凹部、33t 溝部、
71 ベルトコンベア、73 ベルト、74 帯板、
75 エアーヘッダー、76 ノズル、
77 サクションボックス、78a ローラー、
81 吸収性物品、83 吸収体、83e 端縁、
87 裏面シート、89 サイドシート、
G 隙間、Z 膣口対面想定位置、f 繊維、
S1 第1ステーション、S2 第2ステーション、S3 第3ステーション、
CL31 二等分線
前記第1シート状部材に重ね合わされる第2シート状部材と、
前記第1シート状部材及び前記第2シート状部材の少なくとも一方に形成されて前記第1シート状部材と前記第2シート状部材とを接合する複数の接合凹部であって、各接合凹部の長手方向が前記各貫通孔の長手方向に対して傾いている複数の接合凹部と、
を備えたことを特徴とするシート状部材の積層体。
前記各接合凹部の長手方向は、前記各貫通孔の長手方向と直交しているのが望ましい。
このようなシート状部材の積層体によれば、前記接合凹部の長手方向は、前記貫通孔の長手方向と直交しているので、前記接合凹部が前記貫通孔に重なって形成された場合にも、前記接合凹部の一部が前記貫通孔から最もはみ出し易くなる。従って、前記第1シート状部材と前記第2シート状部材との接合に寄与しない部分の大きさを小さくすることができる。
前記第1シート状部材は、複数の溝部を有し、
各溝部の長手方向は、前記各貫通孔の長手方向と同じ方向であり、
前記各溝部は、前記各溝部の長手方向と直交する方向に並んで設けられており、
前記各溝部には、前記複数の貫通孔のうちの少なくとも一つの貫通孔が設けられていても良い。
前記第1シート状部材及び前記第2シート状部材は熱可塑性繊維を含む不織布であり、
前記第1シート状部材と前記第2シート状部材とは、前記接合凹部において溶着されており、
前記第1シート状部材において、前記各貫通孔の長手方向に配向した繊維よりも、前記各貫通孔の長手方向と直交する方向に配向した繊維の方が少ないのが望ましい。
このようなシート状部材の積層体によれば、第1シート状部材において弱くなりがちな前記貫通孔の長手方向と直交する方向の引っ張り強さを前記接合凹部が有効に補強する。よって、前記方向の引っ張り強さを高めることができる。
前記各貫通孔の、前記各貫通孔の長手方向と直交する方向の大きさよりも、
前記接合凹部の、前記各貫通孔の長手方向と直交する方向の大きさが、
0.3〜5mmだけ大きいのが望ましい。
このようなシート状部材の積層体によれば、前記接合凹部の一部が貫通孔に一致していても、接合凹部の高剛性に起因した違和感を抑えつつ接合強度を保つことができる。すなわち、0.3mm未満であると、接合凹部が貫通孔と一致した場合に、接合に殆ど寄与しなくなり、また、5mmを超えると剛性が高い接合凹部によって違和感が出たり、肌を傷つけたりするが、上記のようにすれば、これらを有効に防ぐことができる。
<<シート状部材の積層体1>>
図1は第1実施形態のシート状部材の積層体1の平面図であり、図2は同拡大斜視図である。また、図3は、図1中のII−II断面図である。なお、以下では、図1に示すように、製造時においてシート状部材の積層体1が連続する方向をMD(Machine Direction)方向と言い、このMD方向と直交する方向をCD(Cross Direction)方向と言う。
第1シート状部材11は、例えば、熱可塑性樹脂繊維を含む概ね均一な厚さの不織布を基材とする。熱可塑性樹脂繊維としては、例えば、ポリエチレン(以下、PEと言う)、ポリプロピレン(以下、PPと言う)、ポリエチレンテレフタレート(以下、PETと言う)等を素材とする単独繊維や、PPとPEとを重合してなる繊維、又は、PPとPEとからなる芯鞘構造の複合繊維等が挙げられる。なお、熱可塑性樹脂繊維以外の繊維を含んでいても良く、例えばセルロース等の天然繊維等を含んでいても良い。
第2シート状部材21も、熱可塑性樹脂繊維や、場合によってはセルロース等の天然繊維を含む概ね均一な厚さの不織布を基材とし、また、熱可塑性樹脂繊維としても、上述の第1シート状部材11で例示したものが使用される。
但し、図2及び図3に示すように、この第2シート状部材21には、上述の第1シート状部材11のような溝部13や貫通孔12は形成されておらず、表面21a及び裏面21bの両面について略平坦面となっている。よって、この第2シート状部材21の製造方法としては、通常の不織布の製法が用いられる。すなわち、繊維ウエブの形成方法としては、乾式法(エアレイド法等)、湿式法、紡糸直結法(スパンボンド法やメルトブロー法等)等を例示できる一方、繊維の結合方法としては、サーマルボンド、ニードルパンチ、ケミカルボンド、スパンレース法等を例示できる。
エンボス凹部31は、上述したように、これら第1シート状部材11と第2シート状部材21とを接合する接合部であり、図1Aに示すように、第1シート状部材11の表面11aには、底部31aの平面形状が楕円形の複数のエンボス凹部31が所定の形成パターンで形成されている。
この適用例では、第1実施形態のシート状部材の積層体1が、吸収性物品81としての生理用ナプキンに適用されている。以下では、人体に接触する側を表面側とし、下着に接する側を裏面側として説明する。
図10は、第2実施形態のシート状部材の積層体1を適用した吸収性物品81の表面側の平面図である。このシート状部材の積層体1は、第1実施形態と同様、表面シート部材1に適用されている。
上述の第1実施形態とは、エンボス凹部31の平面形状の点で相違する。よって、前述の図9Aを流用しつつ、以下では主にエンボス凹部31の平面形状について説明する。
以上、本発明の実施形態について説明したが、本発明は、かかる実施形態に限定されるものではなく、以下に示すような変形が可能である。
Claims (4)
- 複数の貫通孔を有し、各貫通孔の長手方向が互いに同じ方向である第1シート状部材と、
前記第1シート状部材に重ね合わされる第2シート状部材と、
前記第1シート状部材及び前記第2シート状部材の少なくとも一方に形成されて前記第1シート状部材と前記第2シート状部材とを接合する複数の接合凹部であって、各接合凹部の長手方向が前記各貫通孔の長手方向に対して傾いている複数の接合凹部と、
を備え、
前記第1シート状部材及び前記第2シート状部材は熱可塑性繊維を含む不織布であり、
前記第1シート状部材と前記第2シート状部材とは、前記接合凹部において溶着されており、
前記第1シート状部材において、前記各貫通孔の長手方向に配向した繊維よりも、前記各貫通孔の長手方向と直交する方向に配向した繊維の方が少ないことを特徴とするシート状部材の積層体。 - 請求項1に記載のシート状部材の積層体であって、
前記各接合凹部の長手方向は、前記各貫通孔の長手方向と直交していることを特徴とするシート状部材の積層体。 - 請求項1又は2に記載のシート状部材の積層体であって、
前記第1シート状部材は、複数の溝部を有し、
各溝部の長手方向は、前記各貫通孔の長手方向と同じ方向であり、
前記各溝部は、前記各溝部の長手方向と直交する方向に並んで設けられており、
前記各溝部には、前記複数の貫通孔のうちの少なくとも一つの貫通孔が設けられていることを特徴とするシート状部材の積層体。 - 複数の貫通孔を有し、各貫通孔の長手方向が互いに同じ方向である第1シート状部材と、
前記第1シート状部材に重ね合わされる第2シート状部材と、
前記第1シート状部材及び前記第2シート状部材の少なくとも一方に形成されて前記第1シート状部材と前記第2シート状部材とを接合する複数の接合凹部であって、各接合凹部の長手方向が前記各貫通孔の長手方向に対して傾いている複数の接合凹部と、
を備え、
前記各貫通孔の、前記各貫通孔の長手方向と直交する方向の大きさよりも、
前記接合凹部の、前記各貫通孔の長手方向と直交する方向の大きさが、0.3〜5mmだけ大きいことを特徴とするシート状部材の積層体。
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AU2008256028A1 (en) | 2008-12-04 |
WO2008146541A1 (ja) | 2008-12-04 |
CN101687383A (zh) | 2010-03-31 |
EG26152A (en) | 2013-03-28 |
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