JP5001756B2 - 使い捨て紙おむつ - Google Patents
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- JP5001756B2 JP5001756B2 JP2007226617A JP2007226617A JP5001756B2 JP 5001756 B2 JP5001756 B2 JP 5001756B2 JP 2007226617 A JP2007226617 A JP 2007226617A JP 2007226617 A JP2007226617 A JP 2007226617A JP 5001756 B2 JP5001756 B2 JP 5001756B2
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Description
前記前身頃用シートを構成する上層不織布及び下層不織布と前記後身頃用シートを構成する上層不織布及び下層不織布とは、不織布種別が異なっており、
前記前身頃用シートを構成する上層不織布及び下層不織布が前記後身頃用シートを構成する上層不織布及び下層不織布よりも少なくともおむつ幅方向の剛度が低くかつ伸度の大きい不織布で構成されていることを特徴とする使い捨て紙おむつが提供される。
図1は本発明に係る使い捨て紙おむつ1の製品状態外観図であり、図2はその展開図、図3は図2のIII−III線矢視図、図4は図2のIV−IV線矢視図である。なお、図面の所要部位において接着部位を×印で明示している。
(吸収性本体10の構造)
図2に示されるように、吸収体13は、図示例では平面形状を略方形状として成形されたものが使用され、その幅寸法は股間部への当たりによって着用者にゴワ付き感を与えない寸法幅となっている。この吸収体13は、形状保持と透液性表面シート11を透過した体液の拡散性向上のためにクレープ紙や不織布等のシートからなる包被シート14によって囲繞されている。前記吸収体13は、積繊パルプやトウからなる繊維集合体に吸収性ポリマーを内在させたものが好ましい。繊維集合体を構成する繊維(以下、単にトウ構成繊維という)としては、例えば、多糖類又はその誘導体(セルロース、セルロースエステル、キチン、キトサンなど)、合成高分子(ポリエチレン、ポリプロピレン、ポリアミド、ポリエステル、ポリラクタアミド、ポリビニルアセテートなど)などであり、特に、セルロースエステルおよびセルロースが好ましい。高吸収性ポリマーとしては、カルボキシメチルセルロース、ポリアクリル酸およびその塩類、アクリル酸塩重合体架橋物、澱粉−アクリル酸グラフト共重合体、澱粉−アクリロニトリルグラフト共重合体の加水分解物、ポリオキシエチレン架橋物、カルボキシメチルセルロース架橋物、ポリエチレンオキサイド、ポリアクリルアミド等の水膨潤性ポリマーを部分架橋したもの、あるいはイソブチレンとマレイン酸との共重合体等が好適に用いられる。前記吸収体13としては、嵩を小さくできるエアレイド吸収体を用いるのが特に好ましい。
前記後身頃用シート20は、図2及び図6に示されるように、使用面側に配設される上層不織布21A及び非使用面側に配設される下層不織布21Bからなる2層構造の不織布シートとされ、前記上層不織布21Aと下層不織布21Bとの間に、ウエスト部23及び胴周り部24の上下方向に間隔をおいて水平方向に沿ってウエスト部弾性伸縮部材26…と、複数の胴周り部弾性伸縮部材28…とが配設され、水平方向に伸縮性が付与されている。かかる後身頃用シート20は、前記吸収性本体10の後身頃B側に接着される。
前身頃用シート30は、前記後身頃用シート20とほぼ同様の構造であり、図2及び図6に示されるように、使用面側に配設される上層不織布31A及び非使用面側に配設される下層不織布31Bからなる2層構造の不織布シートとされ、前記上層不織布31Aと下層不織布31Bとの間の水平方向に各種弾性伸縮部材25…、27…が配設され、水平方向に伸縮性が付与されている。
その他の基本的な構成については、上記後身頃用シート20と同様である。
前記吸収性本体10と後身頃用シート20と前身頃用シート30とは、図6に示されるように、後身頃用外装シート20及び前身頃用シート30の上面側に吸収性本体10がホットメルト等の接着剤によって接着され一体化される。そして、吸収性本体10が折り返しラインSにて前後方向に折り重ねられ、前身頃Fの接合部40、40と後身頃Bの接合部40,40とを熱溶着またはホットメルト接着剤などによって接合することにより、図1に示されるパンツ型紙おむつ1に組み立てられる。
(1)上記形態例では、後身頃用シート20及び前身頃用シート30に配設される弾性伸縮部材は、ウエスト部弾性伸縮部材25…、26…と、前身頃F及び後身頃Bに上下方向に間隔をおいて水平方向に沿って配置された複数の胴周り弾性伸縮部材27…、28…との2種類としたが、脚周りに沿って弾性伸縮部材を配置することも可能である。
Claims (4)
- 透液性のトップシートと裏面シートとの間に吸収体が介在される吸収性本体と、使用面側に配設される上層不織布及び非使用面側に配設される下層不織布の間にウエスト部及び胴周り部に沿って多数の弾性伸縮部材が配設され、前記吸収性本体の後身頃側に接合される後身頃用シートと、使用面側に配設される上層不織布及び非使用面側に配設される下層不織布の間にウエスト部及び胴周り部に沿って多数の弾性伸縮部材が配設され、前記吸収性本体の前身頃側に接合される前身頃用シートとから構成される使い捨て紙おむつであって、
前記前身頃用シートを構成する上層不織布及び下層不織布と前記後身頃用シートを構成する上層不織布及び下層不織布とは、不織布種別が異なっており、
前記前身頃用シートを構成する上層不織布及び下層不織布が前記後身頃用シートを構成する上層不織布及び下層不織布よりも少なくともおむつ幅方向の剛度が低くかつ伸度の大きい不織布で構成されていることを特徴とする使い捨て紙おむつ。 - 前記前身頃用シートを構成する上層不織布及び下層不織布は、前記後身頃用シートを構成する上層不織布及び下層不織布よりも相対的に、繊度の小さい不織布、柔軟剤の多い不織布、目付けの低い不織布、厚さの薄い不織布、繊維同士の接着が少ない不織布又は不織布製作時の加工温度を低くした不織布が使用されている請求項1記載の使い捨て紙おむつ。
- 前記後身頃用シートを構成する上層不織布は、吸汗性に優れた素材で構成され、前記前身頃用シートを構成する上層不織布は、撥水性の素材で構成されている請求項1〜2いずれかに記載の使い捨て紙おむつ。
- 前記前身頃用シート及び後身頃用シートには、外部から前身頃又は後身頃の別が認識可能な彩色、文字、絵図、形状、デザインなどの区分け手段が施されている請求項1〜3いずれかに記載の使い捨て紙おむつ。
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