JP3886287B2

JP3886287B2 - Disposable paper diapers

Info

Publication number: JP3886287B2
Application number: JP07475899A
Authority: JP
Inventors: 憲一田畑
Original assignee: Daio Paper Corp
Current assignee: Daio Paper Corp
Priority date: 1999-03-19
Filing date: 1999-03-19
Publication date: 2007-02-28
Anticipated expiration: 2019-03-19
Also published as: JP2000262555A

Description

【０００１】
【発明の属する技術分野】
本発明は、特に立体ギャザーの起立高さを十分に確保しながら、有効吸収体表面積を大きく取れるようにした使い捨て紙おむつに関する。
【０００２】
【従来の技術】
現在、使い捨て紙おむつでは、両側部に紙おむつの長手方向に沿って表面側に起立する立体ギャザーを有するものが主流となっているが、この立体ギャザーの形成方法には、立体ギャザーの起立方向の観点より２通りの方法が存在する。
【０００３】
先ず、第１の方法は、図８に示されるように、紙おむつ両側部において不透液性バックシート１と接着剤により固着され吸収体３の存在しないサイドフラップＳＦを形成しているバリヤシート４の内側シート部分（以下、立体ギャザー形成シート４Ａという。）を吸収体３の側縁部を起立基端として内方側まで延在して形成し、かつ立体ギャザー形成シート４Ａの先端に弾性伸縮材９を配置するとともに、この立体ギャザー形成シート４Ａの紙おむつ長手方向両端部においてその内面側を透液性シート表面２に固着することにより、前記立体ギャザー形成シート４Ａを断面視でハ字状に起立させるようにする方法であり、第２の方法は、図９に示されるように、立体ギャザー形成シート４Ａを外側に折り返し、紙おむつ長手方向両端部においてその外面側をバリヤシート４表面に固着することにより、前記立体ギャザー形成シート４Ａを断面視で逆ハ字状に起立させるようにする方法である。なお、前記例では立体ギャザーはバリヤシート４を利用して形成したが、別途、単独の立体ギャザー形成用シートを用いて立体ギャザーを形成する場合もある。
【０００４】
現在市販されている多くの紙おむつは前記第１の方法を採用しており、第２の方法のものとしては、たとえば特開平５−３１７３６２号公報に記載されるものを挙げることができる。
【０００５】
【発明が解決しようとする課題】
前記第１の方法により形成した立体ギャザーは、立体ギャザーにより形成された内側に向けた横Ｖ字状ポケットＰＫにより側方に漏れ出そうとする排泄物を確実に堰き止めることができるなどの利点を有するが、一方で立体ギャザーが吸収体表面を覆い易くなり、有効活用幅ＹＢが小さくなるため吸収体３の有効吸収体表面積が減少し、吸収能が低下してしまうなどの問題が生じていた。この問題を解決するために、たとえば立体ギャザーの起立高さを小さくすると、今度は立体ギャザー先端に配置した弾性伸縮部材９が肌へ確実にフィットしなくなり、隙間から排泄物や尿が漏れ出してしまうなどの問題が発生することになる。
【０００６】
一方、前記第２の方法により形成した立体ギャザーの場合には、立体ギャザーの起立固定端より外側に向かって立体ギャザーが起立しているため、両側に配置される立体ギャザーの起立固定端間の吸収体面積を有効に活用し得るようになるけれども、排泄物が漏れ出し易くなってしまうなどの問題があった。
【０００７】
他方で、前記第１または第２の方法によらず、この種の紙おむつの場合には、着用しているうちに、腰回りが肌になじむことにより、あるいは吸収体が尿を吸収して重くなるなどの理由により徐々に紙おむつがずり落ちる現象がみられ、前記立体ギャザーの起立高さが十分でない場合には肌との間に隙間が形成されるようになり、排泄物が横漏れし易くなるなどの問題もあった。
【０００８】
そこで本発明の主たる課題は、立体ギャザーによって形成された横Ｖ字状ポケットにより確実に排泄物の横漏れを防止するとともに、立体ギャザーの起立高さを十分に確保しながら吸収体の有効吸収体表面積を大きく取ることができ、しかも着用状態から紙おむつがずり落ちても立体ギャザーがこのずり落ちに追随し肌との間に隙間を形成しないようにした使い捨て紙おむつを提供することにある。
【０００９】
【課題を解決するための手段】
前記課題を解決するための本第１発明は、透液性トップシートと不透液性バックシートとの間に吸収体が介在され、紙おむつの両側部に紙おむつ長手方向に沿って表面側に突出する立体ギャザーが形成された使い捨て紙おむつにおいて、
前記立体ギャザーの起立シート面内であってかつ紙おむつの略長手方向に沿って、紙おむつの長手方向中間部では相対的に起立先端部側に固着されるとともに、紙おむつの長手方向両端部では前記紙おむつ長手方向中間部での固着位置よりも相対的に起立固定端側位置に固着された、紙おむつの展開状態で平面的に視て内側に突出する多角線状または曲線状に第１の弾性伸縮部材を配設し、
かつ紙おむつの長手方向両端部では相対的に起立先端部側に固着されるとともに、紙おむつの長手方向中間部では前記紙おむつ長手方向両端部での固着位置よりも相対的に起立固定端側位置に固着された、紙おむつの展開状態で平面的に視て外側に突出する多角線状または曲線状に第２の弾性伸縮部材を配設することにより、前記立体ギャザーを起立固定端より吸収体内側に向けて起立した後、中間点から外側に反転し外側に向けて起立させるようにしたことを特徴とするものである。
【００１０】
次いで、第２の本発明は、透液性トップシートと不透液性バックシートとの間に吸収体が介在され、紙おむつの両側部に、起立先端部に紙おむつの展開状態で平面的に視て直線状の先端部弾性伸縮部材が配設されることにより表面側に突出する立体ギャザーが形成された使い捨て紙おむつにおいて、
前記立体ギャザーの起立シート面内であってかつ紙おむつの略長手方向に沿って、紙おむつの長手方向両端部では相対的に起立先端部側に固着されるとともに、紙おむつの長手方向中間部では前記紙おむつ長手方向両端部での固着位置よりも相対的に起立固定端側位置に固着された、紙おむつの展開状態で平面的に視て外側に突出する多角線状または曲線状に中間部弾性伸縮部材を配設することにより、前記立体ギャザーを起立固定端より吸収体内側に向けて起立した後、中間点から鉛直または略鉛直状態で起立させるようにしたことを特徴とするものである。
【００１１】
これらの使い捨て紙おむつにおいて、紙おむつの展開状態で平面的に視て多角線状または曲線状に配置された前記弾性伸縮部材は、紙おむつの長手方向両端部での固着点と、紙おむつ長手方向中間での固着点とのシフト量を少なくとも１０mm以上としてあることが望ましい。
【００１２】
他方で、蒸れ易い脚周りの通気性を確保するためには、前記不透液性バックシートを吸収体の両側縁よりも若干側方に延在させて形成するとともに、透液性トップシートの側縁部と前記側方延在部において固着し、かつ前記立体ギャザーを形成しているバリヤシートの幅方向中間部を前記側方延在部分から吸収体側縁に跨る領域において紙おむつの略長手方向に沿って固着し、この固着部分より側方に延在する外側バリヤシート部分によりサイドフラップ部を形成するとともに、このサイドフラップ部を外縁部で折り返し、この折り返し内部に側部弾性伸縮部材を配置しガスケットカフスを形成するようにすればよい。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照しながら詳述する。
【００１４】
〔第１形態例〕
図１は本発明に係る紙おむつの一部破断展開図であり、図２はその要部拡大展開図である。なお、図中、×印は接着部位を示す記号である。
【００１５】
図１において紙おむつは、ポリエチレン等からなる不透液性バックシート１と、不織布などからなる透液性トップシート２との間に、綿状パルプ等からなる、たとえば長方形若しくは砂時計形状のある程度の剛性を有する吸収体３が介在されている。吸収体３は、その形状保持のために吸収紙（図示せず）により包み込むことができる。前記不透液性バックーシート１としては、近年、ムレ防止の点から透湿性を有するものも用いられている。この遮水・透湿性シートは、たとえばポリエチレンやポリプロピレン等のオレフィン樹脂中に無機充填材を溶融混練してシートを形成した後、一軸または二軸方向に延伸することにより得られる微多孔性シートである。また、前記透液性トップシート２としては、有孔または無孔の不織布や穴あきプラスチックシートなどが用いられる。不織布を構成する素材繊維としては、ポリエチレンまたはポリプロピレン等のオレフィン系、ポリエステル系、アミド系等の合成繊維の他、レーヨンやキュプラ等の再生繊維、綿等の天然繊維とすることができる。
【００１６】
前記不透液性バックシート１は、吸収体３の周囲より外方に延在して略砂時計形状を成しており、その側方延在部は後述するバリヤシート４の側部とともに、吸収体の存在しないサイドフラップ部ＳＦを構成している。透液性トップシート２は、吸収体３より若干大きめの砂時計形状とされ、吸収体３側縁より若干外方に延在する部分が前記バリヤシート４と不透液性バックシート１との間に介在され不透液性バックシート１側にホットメルト接着剤などにより固着されている。前記バリヤシート４の形成材料としては、プラスチックシートやメルトブローン不織布を使用することもできるが、肌への感触性の点で、不織布にシリコンなどにより撥水処理をしたものが好適に使用される。
【００１７】
他方、紙おむつの長手方向端部、すなわち腹側および背側には不透液性バックシート１および透液性トップシート２が延在し吸収体３の存在しないエンドフラップ部ＥＦが形成され、発泡ウレタンなどからなる弾性伸縮バンド５，６がそれぞれ介在され、背側の両端部にはファスニングテープ７，７が設けられている。
【００１８】
前記紙おむつの両側部には、長手方向に沿って使用面側に突出する左右一対のバリヤカフスＢＫ（立体ギャザー）が形成されている。
【００１９】
このバリヤカフスＢＫは、詳細には図２に示されるように、不透液性バックシート１に対応してサイドフラップ部ＳＦまで延在して設けられたバリヤシート４の内側シート部分により構成されるもので、吸収体３側縁部より若干内方側位置を起立固定端とし、かつ紙おむつの長手方向両端部ＴＡにおいて内面側が透液性トップシート２に固着されている。
【００２０】
本使い捨て紙おむつにおける前記バリヤカフスＢＫは、その先端部が所定幅で二重に折り返され、この折り返し部の内部、すなわち本発明に言う起立シート面内に１本（または複数本が組として）の第１の弾性伸縮部材１０と第２の弾性伸縮部材１１とが配設されている。
【００２１】
前記第１の弾性伸縮部材１０は、図１に示されるように、紙おむつの略長手方向に沿って、紙おむつの長手方向中間部では相対的に起立先端部側に固着されるとともに、紙おむつの長手方向両端部では前記紙おむつ長手方向中間部での固着位置よりも相対的に起立固定端側位置に固着された、紙おむつの展開状態で平面的に視て内側に突出する曲線状に配設された弾性伸縮部材であり、前記第２の弾性伸縮部材１１は同じく紙おむつの略長手方向に沿って、紙おむつの長手方向両端部では相対的に起立先端部側に固着されるとともに、紙おむつの長手方向中間部では前記紙おむつ長手方向両端部での固着位置よりも相対的に起立固定端側位置に固着された、平面的に視て外側に突出する曲線状に配設された弾性伸縮部材である。なお、前記第１および第２の弾性伸縮部材１０，１１は、平面的に視て多角線状に配設されることでもよい。
【００２２】
前記第１および第２の弾性伸縮部材１０，１１は、紙おむつの長手方向両端部での固着点と、紙おむつ長手方向中間での固着点とのシフト量Ｓ_１，Ｓ_２は少なくとも１０mm以上とするのが望ましい。このシフト量Ｓ_１，Ｓ_２が小さ過ぎる場合には、後述のように第１および第２の弾性伸縮部材１０，１１に作用する水平方向ベクトル成分が小さくなり、バリヤカフスＢＫを綺麗に反り返し出来なくなる。
【００２３】
以上のように第１および第２の弾性伸縮部材１０，１１が配設されたバリヤカフスＢＫでは、図３に示されるように、起立固定端より吸収体内側に向けて起立した後、第２の弾性伸縮部材１１の配設部位ＨＰ（以下、反り返し中間点という。）にて外側に反転し外側に向けて起立するようになる。すなわち、図４において従来のように先端部弾性伸縮部材９のみを配置したバリヤカフスの場合の起立形状線を鎖線Ｋで示すと、本バリヤカフスＢＫの場合には、起立先端部では第１の弾性伸縮部材１０によって、紙おむつ両端部と中間部とにおける固着点のシフト量Ｓ_１に相当する水平方向ベクトル成分Ｈ_１０と、鉛直方向ベクトル成分Ｖ_１０とが作用し、前記水平方向ベクトル成分Ｈ_１０の水平方向力によって同図に実線で示されるように、バリヤカフスＢＫの先端部が紙おむつの幅方向外側に移動し、かつ起立中間部では第２の弾性伸縮部材１１によって、紙おむつ両端部と中間部とにおける固着点のシフト量Ｓ_２に相当する水平方向ベクトル成分Ｈ_１１と、鉛直方向ベクトル成分Ｖ_１１とが作用し、前記水平方向ベクトル成分Ｈ_１１の水平方向力によって同図に実線で示されるように、バリヤカフスＢＫの中間部が紙おむつの幅方向中心側に移動し、結果的にバリヤカフスＢＫは、起立固定端より吸収体内側に向けて起立した後、反り返し中間点ＨＰにて外側に反転し外側に向けて起立するようになる。
【００２４】
以上のように構成されるバリヤカフスＢＫにおいては、バリヤカフスＫＢの下側障壁シート部分により横Ｖ字状ポケットＰＫが形成され、この部分により確実の排泄物の横漏れを防止し得るようになるとともに、起立高さを十分に確保しながら吸収体の有効活用幅ＹＢを広く取ることが可能となる。さらには、バリヤカフスＢＫを反り返し構造としたことにより、換言すれば上下方向に伸縮するバリヤカフスＢＫとなり、装着後に紙おむつがずり落ちることがあっても、バリヤカフスＢＫの伸縮により肌との間に隙間を空けることなく、紙おむつのずり落ちに追随し得るようになる。
【００２５】
他方、バリヤカフスＢＫの外側に存在するサイドフラップＳＦには、バリヤシート４と不透液性バックシート１との間に紙おむつ長手方向に沿って複数本の、本例では３本の側部弾性伸縮部材８，８…がホットメルト接着剤などにより固着され、その伸縮力によりひだ状のガスケットカフスＧＫが形成されている。前記弾性伸縮部材８，１０、１１としては、通常使用されるスチレン系ゴム、オレフィン系ゴム、ウレタン系ゴム、エステル系ゴム、ポリウレタン、ポリエチレン等の素材を用いることができる。
【００２６】
かかる紙おむつによれば、前記バリヤカフスＢＫが着用事に装着者の脚周りに当接し、バリヤカフスＢＫの反り返し中間点ＨＰより下側の障壁シート部分と透液性シート２とで形成される横Ｖ字状ポケットが排泄物の閉じ込め用ポケットとして機能することにより排泄物の乗り越えを確実に防止するとともに、尿は十分に広く確保された有効吸収体エリアの透液性シート２を通過して吸収体３に吸収される。仮に、バリヤカフスＢＫを乗り越えて横方向に漏れたとしても弾性伸縮部材８，８…によって形成された前記ガスケットカフスＧＫにより横漏れが防止されるようになる。
【００２７】
また、前記第２の弾性伸縮部材１１により、反り返し中間点ＨＰより下側の障壁シート部分を確実に起立させることができるようになるとともに、紙おむつが肌に密着した状態にあるときは、少なくとも紙おむつ長手方向中間部では前記第２の弾性伸縮部材１１と先端に配置された第１の弾性伸縮部材１０とが共に肌にフィットすることで反り返し中間点ＨＰより上側の障壁シート部分が面状に肌に密着して確実に排泄物の乗り越えを防止する。
【００２８】
他方、前述した紙おむつの例では、サイドフラップ部ＳＦがポリエチレン等の不透液性バックシート１と不織布からなるバリヤシート４との重層構造となっており、汗をかき易い脚周りの通気性に欠けていた。そのため、長時間着用していると、ムレがひどくなり、特に夏場などはあせもや湿疹などの原因ともなっていた。また、相対的に柔軟性の低いポリエチレンシートは、脚周りに柔らかくフィットしづらく、装着者がゴワ付き感を感じるなどの問題があった。
【００２９】
そこで、図５に示されるように、前記不透液性バックシート１を吸収体３の両側縁よりも少しだけ側方に延在させて形成し、透液性トップシート２の側縁部と前記側方延在部において固着し、かつバリヤカフスＢＫを形成しているバリヤシート４を前記側方延在部分から吸収体３側縁に跨る領域において紙おむつの略長手方向に沿って固着するようにし、この固着部分より側方に延在する前記バリヤシート部分４Ｂによりサイドフラップ部ＳＦを形成するようにすればよい。また、前記バリヤシート４によって形成されたサイドフラップ部ＳＦにおいては、バリヤシート４を外縁部で折り返し、この折り返し内部に弾性伸縮部材８，８…を配置してガスケットカフスＧＫを形成するようにする。このようにサイドフラップ部ＳＦを構成することにより、脚周り部分に高い通気性が確保されるようになり、ムレやあせもなどが防止されるようになる。なお、この例に用いられるバリヤシート４としては、ムレを防止するために、坪量を抑えて通気性に優れた不織布を用いるのがよい。具体的には、概ね坪量１８〜２３g/m^２として作製された不織布を用いるのが望ましい。また、体液の透過を確実に防止するとともに、肌への感触性を高めるために、シリコン系、パラフィン系金属系、アルキルクロミッククロイド系撥水剤などをコーティングした撥水処理不織布を用いるのが望ましい。
【００３０】
〔第２形態例〕
第２形態例として図６に示される紙おむつは、バリヤカフスＢＫの先端部が所定幅で二重に折り返され、この折り返し内部の先端に、紙おむつの長手方向に沿って直線状に配置された１本（または複数本が組として）の先端部弾性伸縮部材１２を配設するとともに、紙おむつの長手方向両端部では相対的に起立先端部側に固着されるとともに、紙おむつの長手方向中間部では前記紙おむつ長手方向両端部での固着位置よりも相対的に起立固定端側位置に固着された、平面的に視て外側に突出する曲線状（または多角線状）の中間部弾性伸縮部材１３を配設したものである。
【００３１】
この配置態様では、図７に示されるように、中間部弾性伸縮部材１３には、前記第１例と同じように、紙おむつ両端部と中間部とにおける固着点のシフト量Ｓに相当する水平方向ベクトル成分Ｈ_１３と、鉛直方向ベクトル成分Ｖ_１３とが作用し、前記水平方向ベクトル成分Ｈ_１３の作用力によってバリヤカフスＢＫの中間部が紙おむつ幅方向中心側に移動する。しかし、先端部弾性伸縮部材１２の位置よりも中心側に位置することは物理的にあり得ないから、先端部弾性伸縮部材１２の下方に位置するようになり、中間部弾性伸縮部材１３より上側シート部分が鉛直または略鉛直状態で起立することになる。
【００３２】
この場合であっても、バリヤカフスＫＢの下側障壁シート部分により横Ｖ字状ポケットＰＫが形成され、この部分により確実の排泄物の横漏れを防止し得るようになるとともに、起立高さを十分に確保しながら吸収体の有効活用幅ＹＢを広く取ることが可能となるとともに、装着後に紙おむつがずり落ちることがあっても、バリヤカフスＢＫに十分な起立高さが確保できるようになることにより肌との間に隙間を空けることなく、紙おむつのずり落ちに追随し得るようになるなど上記第１形態例の場合とほぼ同様の効果を奏することができるようになる。
【００３３】
なお、この場合も前記前記紙おむつの長手方向両端部での固着点と、紙おむつ長手方向中間での固着点とのシフト量Ｓは少なくとも１０mm以上とするのが望ましい。このシフト量Ｓが小さ過ぎる場合には、後述のように中間部弾性伸縮部材１３に作用する水平方向ベクトル成分が小さくなり、中間部弾性部材部材１３の配設部位より上側部分を略鉛直方向に起立出来なくなる。
【００３４】
また、前記バリヤカフスＢＫの先端部に配設される先端部弾性伸縮部材１２よりもバリヤカフスＢＫの中間に配設される前記中間部弾性伸縮部材１３の伸縮力を大きく設定するようにするのがよい。具体的には、中間部弾性伸縮部材１３の伸縮力を先端部弾性伸縮部材１２の伸縮力の１２０〜２００％程度とするのがよい。先端部弾性伸縮部材１２の伸縮力が大き過ぎると、バリヤカフスＢＫを立ち上げるための鉛直ベクトル成分が大きくなり、この鉛直ベクトル成分に抗してバリヤカフスＢＫの中間部を紙おむつの長手方向中心側に移動させることが困難となる。
【００３５】
以上、本発明をテープ止着型紙おむつの例により説明したが、本発明はパンツ型紙おむつに対しても全く同様に適用することが出来る。
【００３６】
【発明の効果】
以上詳説のとおり本発明によれば、バリヤカフスは起立固定端より吸収体内側に向けて起立した後、中間点から外側に反転し外側に向けて、または中間点からほぼ鉛直に起立するようになる。従って、下側の障壁シート部分によって形成された横Ｖ字状ポケットにより確実の排泄物の横漏れを防止し得るようになるとともに、バリヤカフスの起立高さを確保しながら吸収体の有効吸収体表面積を大きく取ることが可能になる。
【００３７】
さらに、バリヤカフスが高さ方向に伸縮可能、または十分な起立高さが確保されるようになるため、装着状態から紙おむつがずり落ちてもバリヤカフスがこのずり落ちに追随し肌との間に隙間を形成させることがないなどの利点も同時にもたらされるようになる。
【図面の簡単な説明】
【図１】本第１形態例における紙おむつの一部破断展開図である。
【図２】その要部拡大展開図である。
【図３】紙おむつの中央位置での横断面図である。
【図４】バリヤカフスＢＫの起立状態を説明するための図である。
【図５】紙おむつの変形例を示す要部拡大展開図である。
【図６】本第２形態例における紙おむつの一部破断展開図である。
【図７】バリヤカフスＢＫの起立状態を説明するための図である。
【図８】従来の立体ギャザー形成例を示す紙おむつ横断面図である。
【図９】従来の他の立体ギャザー形成例を示す紙おむつ横断面図である。
【符号の説明】
１…不透液性バックシート、２…透液性トップシート、３…吸収体、４…バリヤシート、５・６…弾性伸縮バンド、７…ファスニングテープ、８…側部弾性伸縮部材、１０…第１の弾性伸縮部材、１１…第２の弾性伸縮部材、１２…先端部弾性伸縮部材、１３…中間部弾性伸縮部材、ＨＰ…反り返し中間点、ＢＫ…バリヤカフス（立体ギャザー）、ＳＦ…サイドフラップ部、ＰＫ…横Ｖ字状ポケット[0001]
BACKGROUND OF THE INVENTION
In particular, the present invention relates to a disposable paper diaper that has a large effective absorbent surface area while ensuring a sufficient standing height of a three-dimensional gather.
[0002]
[Prior art]
At present, disposable disposable diapers are mainly used which have solid gathers standing on the surface side along the longitudinal direction of the disposable diapers on both sides, but this three-dimensional gathering method has a viewpoint of the standing direction of the solid gathers. There are two more ways.
[0003]
First, as shown in FIG. 8, the first method is a barrier sheet 4 in which a side flap SF that does not have an absorber 3 and is fixed to a liquid-impervious backsheet 1 and an adhesive on both sides of a paper diaper is formed. The inner sheet portion (hereinafter referred to as a three-dimensional gather forming sheet 4A) is formed to extend inward with the side edge of the absorbent body 3 as an upright base end, and is elastically stretched at the tip of the three-dimensional gather forming sheet 4A. The material 9 is arranged and the inner surface side is fixed to the liquid-permeable sheet surface 2 at both ends of the three-dimensional gathered sheet 4A in the longitudinal direction of the paper diaper. As shown in FIG. 9, the second method is to fold the three-dimensional gather forming sheet 4A outward and place it at both ends of the paper diaper in the longitudinal direction. By fixing the outer surface to the barrier sheet 4 surface, the standing gather forming sheet 4A is a way to be erected in the reverse V-shape in cross section. In the above example, the three-dimensional gather is formed using the barrier sheet 4, but the three-dimensional gather may be separately formed using a single three-dimensional gather forming sheet.
[0004]
Many paper diapers currently on the market employ the first method, and examples of the second method include those described in JP-A-5-317362.
[0005]
[Problems to be solved by the invention]
The three-dimensional gather formed by the first method has an advantage that the excrement that is about to leak to the side can be reliably dammed by the lateral V-shaped pocket PK formed by the three-dimensional gather. However, on the other hand, the three-dimensional gathering easily covers the surface of the absorber, and the effective utilization width YB is reduced, so that the effective absorber surface area of the absorber 3 is reduced and the absorption capacity is reduced. It was. In order to solve this problem, for example, if the standing height of the three-dimensional gather is reduced, this time, the elastic elastic member 9 arranged at the tip of the three-dimensional gather will not fit into the skin reliably, and excrement and urine will leak from the gap. Problems will occur.
[0006]
On the other hand, in the case of the three-dimensional gather formed by the second method, since the three-dimensional gather stands up from the standing fixed end of the three-dimensional gather, the space between the standing fixed ends of the three-dimensional gather arranged on both sides is increased. Although the absorber area can be effectively used, there is a problem that excrement easily leaks out.
[0007]
On the other hand, regardless of the first or second method, in the case of this type of paper diaper, the waist becomes familiar with the skin while wearing, or the absorber absorbs urine and becomes heavy. There is a phenomenon that the paper diaper gradually falls due to reasons such as, and when the standing height of the three-dimensional gather is not sufficient, a gap is formed between the skin and the excrement easily leaks sideways There were also problems such as.
[0008]
Therefore, the main problem of the present invention is that the lateral V-shaped pocket formed by the three-dimensional gather surely prevents the side leakage of the excrement, and also ensures the effective height of the three-dimensional gather while sufficiently absorbing the absorber. An object of the present invention is to provide a disposable paper diaper which can take a large surface area and prevents a three-dimensional gather from following the slippage and forming a gap with the skin even if the paper diaper slips from the worn state.
[0009]
[Means for Solving the Problems]
In the first invention for solving the above-mentioned problems, an absorbent body is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet, and protrudes to the surface side along the longitudinal direction of the paper diaper on both sides of the paper diaper. In disposable paper diapers in which a three-dimensional gather is formed,
Within the standing sheet surface of the three-dimensional gather and along the substantially longitudinal direction of the paper diaper, the longitudinally middle portion of the paper diaper is relatively fixed to the standing tip side, and the paper diaper is disposed at both longitudinal ends of the paper diaper. A first elastic expansion / contraction member in a polygonal line shape or a curved shape protruding inward in a plan view in a deployed state of the paper diaper, which is fixed to the standing fixed end side position relative to the fixing position in the middle portion in the longitudinal direction. Arrange
At the both ends of the paper diaper in the longitudinal direction, the paper diaper is fixed to the standing tip end side relatively, and at the middle part of the paper diaper in the longitudinal direction, the paper diaper is fixed to the standing fixed end side position relatively than the fixing position at the both ends in the longitudinal direction By arranging the second elastic expansion and contraction member in a polygonal line shape or a curved shape protruding outward in a plan view in the deployed state of the disposable diaper, the solid gathers are directed from the standing fixed end toward the inside of the absorber. After standing upside down, it is inverted from the intermediate point to the outside and raised toward the outside .
[0010]
Next, according to the second aspect of the present invention, an absorbent body is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet. In the disposable paper diaper in which a three-dimensional gather that protrudes to the surface side is formed by disposing a linear tip elastic elastic member,
In the standing sheet surface of the three-dimensional gather and along the substantially longitudinal direction of the paper diaper, both ends in the longitudinal direction of the paper diaper are relatively fixed to the standing tip side, and the paper diaper is located in the longitudinal middle portion of the paper diaper. An intermediate elastic stretchable member that is fixed to the standing fixed end side position relative to the fixed position at both ends in the longitudinal direction and that protrudes outward in a plan view in a deployed state of the paper diaper in a polygonal line shape or curved shape. By disposing, the three-dimensional gather is erected from the standing fixed end toward the inside of the absorber, and is then erected in a vertical or substantially vertical state from an intermediate point .
[0011]
In these disposable paper diapers, the elastic elastic members arranged in a polygonal line shape or a curved shape in a plan view in a deployed state of the paper diaper are fixed at the longitudinal end portions of the paper diaper and in the middle of the paper diaper longitudinal direction. It is desirable that the shift amount with respect to the fixing point is at least 10 mm.
[0012]
On the other hand, in order to ensure breathability around the legs that are easily stuffy, the liquid-impervious backsheet is formed to extend slightly laterally from both side edges of the absorber, and the liquid-permeable topsheet A substantially longitudinal direction of the paper diaper in a region extending in the width direction intermediate portion of the barrier sheet that is fixed at the side edge portion and the side extending portion and forms the three-dimensional gather from the side extending portion to the absorber side edge. A side flap portion is formed by an outer barrier sheet portion that is fixed along the fixing portion and extends laterally from the fixing portion, and the side flap portion is folded at the outer edge portion, and a side elastic elastic member is disposed inside the folded portion. The gasket cuff may be formed.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
[First embodiment]
FIG. 1 is a partially broken development view of a disposable diaper according to the present invention, and FIG. 2 is an enlarged development view of a main part thereof. In the figure, the x mark is a symbol indicating an adhesion site.
[0015]
In FIG. 1, a paper diaper is made of cotton pulp or the like, for example, rectangular or hourglass-shaped rigidity between a liquid-impermeable back sheet 1 made of polyethylene or the like and a liquid-permeable top sheet 2 made of nonwoven fabric or the like. Is interposed. The absorbent body 3 can be wrapped with absorbent paper (not shown) to maintain its shape. As the liquid-impervious backsheet 1, those having moisture permeability have been used in recent years from the viewpoint of preventing stuffiness. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there. As the liquid-permeable top sheet 2, a perforated or non-porous nonwoven fabric or a perforated plastic sheet is used. As the raw material fibers constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene such as olefin, polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.
[0016]
The liquid-impermeable back sheet 1 extends outward from the periphery of the absorbent body 3 to form a substantially hourglass shape, and the laterally extending portion is absorbed together with the side portion of the barrier sheet 4 described later. The side flap part SF which does not have a body is comprised. The liquid-permeable top sheet 2 has an hourglass shape that is slightly larger than the absorbent body 3, and a portion that extends slightly outward from the side edge of the absorbent body 3 is between the barrier sheet 4 and the liquid-impermeable back sheet 1. And fixed to the liquid-impermeable back sheet 1 side by a hot melt adhesive or the like. As the material for forming the barrier sheet 4, a plastic sheet or a melt blown nonwoven fabric can be used, but from the viewpoint of touch to the skin, a nonwoven fabric that is water-repellent treated with silicon or the like is preferably used.
[0017]
On the other hand, a liquid-impervious backsheet 1 and a liquid-permeable topsheet 2 extend to the longitudinal direction ends of the paper diaper, that is, the ventral side and the back side, and an end flap portion EF in which the absorbent body 3 does not exist is formed. Elastic elastic bands 5 and 6 made of urethane or the like are interposed, and fastening tapes 7 and 7 are provided at both ends on the back side.
[0018]
On both sides of the paper diaper, a pair of left and right barrier cuffs BK (three-dimensional gathers) projecting toward the use surface side along the longitudinal direction are formed.
[0019]
As shown in detail in FIG. 2, the barrier cuff BK is configured by an inner sheet portion of the barrier sheet 4 provided to extend to the side flap portion SF corresponding to the liquid-impermeable back sheet 1. Therefore, the inner side is fixed to the liquid-permeable top sheet 2 at both ends in the longitudinal direction TA of the paper diaper with the upright fixed end at a position slightly inward from the side edge of the absorbent body 3.
[0020]
In the disposable paper diaper, the barrier cuff BK has its tip end folded back twice with a predetermined width, and one (or a plurality of sets) in the folded-back portion, that is, in the standing sheet surface according to the present invention. One elastic expansion / contraction member 10 and a second elastic expansion / contraction member 11 are disposed.
[0021]
As shown in FIG. 1, the first elastic elastic member 10 is fixed along the substantially longitudinal direction of the paper diaper, and is relatively fixed to the standing tip side in the middle part of the paper diaper, and the length of the paper diaper is long. At both ends in the direction, the diaper is disposed in a curved shape projecting inward in a plan view in a developed state of the disposable diaper, which is fixed to the standing fixed end side position relative to the fixing position in the middle part in the longitudinal direction of the disposable diaper. The elastic elastic member is the elastic elastic member, and the second elastic elastic member 11 is fixed along the substantially longitudinal direction of the paper diaper, and relatively fixed to the standing tip end side at both longitudinal ends of the paper diaper, and is intermediate in the longitudinal direction of the paper diaper. The elastic elastic member is arranged in a curved shape protruding outward in plan view, fixed to the standing fixed end side position relative to the fixed positions at both ends in the longitudinal direction of the paper diaper. The first and second elastic elastic members 10 and 11 may be arranged in a polygonal line as viewed in plan.
[0022]
The first and second elastic elastic members 10 and 11 have shift amounts S ₁ and S ₂ of at least 10 mm or more between the fixing points at both ends in the longitudinal direction of the paper diaper and the fixing points at the middle in the longitudinal direction of the paper diaper. Is desirable. When the shift amounts S ₁ and S ₂ are too small, the horizontal vector components acting on the first and second elastic elastic members 10 and 11 become small as will be described later, and the barrier cuff BK can be beautifully warped. Disappear.
[0023]
In the barrier cuff BK in which the first and second elastic elastic members 10 and 11 are arranged as described above, as shown in FIG. 3, after standing from the standing fixed end toward the absorber inner side, The elastic stretchable member 11 is inverted outward at an arrangement site HP (hereinafter, referred to as a warping intermediate point) and rises outward. That is, in FIG. 4, when the standing shape line in the case of the barrier cuff having only the tip elastic stretchable member 9 as shown in FIG. 4 is indicated by the chain line K, in the case of this barrier cuff BK, the first elastic stretch at the standing tip. the member 10, the horizontal vector component H ₁₀ corresponding to the shift amount S ₁ of the anchoring point in the disposable diaper end portions and an intermediate portion, acts with vertical vector components V _10, the horizontal of the horizontal vector component H ₁₀ As indicated by the solid line in the figure, the front end of the barrier cuff BK moves outward in the width direction of the paper diaper, and the second elastic elastic member 11 at the standing intermediate portion at the both ends and the intermediate portion of the paper diaper. the horizontal vector component H ₁₁ corresponding to the shift amount S ₂ of the anchoring point, acts and vertical vector components V _11, the horizontal vector component H ₁₁ , the intermediate portion of the barrier cuff BK moves to the center side in the width direction of the paper diaper, and as a result, the barrier cuff BK stands up toward the inner side of the absorber from the standing fixed end. After that, the warp turns to the outside at the intermediate point HP and rises outward.
[0024]
In the barrier cuff BK configured as described above, a lateral V-shaped pocket PK is formed by the lower barrier sheet portion of the barrier cuff KB, and this portion can prevent the side leakage of the excretion with certainty. It is possible to widen the effective use width YB of the absorber while sufficiently securing the standing height. In addition, the barrier cuff BK has a curved structure, in other words, a barrier cuff BK that expands and contracts in the vertical direction. Even if the paper diaper slides down after being attached, the barrier cuff BK expands and contracts with the skin. Without being able to follow the diaper slip.
[0025]
On the other hand, the side flap SF existing outside the barrier cuff BK is provided with a plurality of, in this example, three side elastic stretches along the longitudinal direction of the paper diaper between the barrier sheet 4 and the liquid-impermeable back sheet 1. The members 8, 8... Are fixed by a hot melt adhesive or the like, and a pleated gasket cuff GK is formed by the expansion / contraction force. As the elastic elastic members 8, 10, 11, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene and the like that are usually used can be used.
[0026]
According to such a paper diaper, the barrier cuff BK is brought into contact with the leg of the wearer when worn, and the lateral V formed by the barrier sheet portion below the intermediate point HP of the barrier cuff BK and the liquid-permeable sheet 2 is formed. The character-shaped pocket functions as a pocket for confinement of excrement to prevent the excrement from getting over, and the urine passes through the liquid-permeable sheet 2 in the effective absorber area secured sufficiently wide. 3 is absorbed. Even if the barrier cuff BK gets over the barrier cuff BK and leaks in the lateral direction, the gasket cuff GK formed by the elastic elastic members 8, 8.
[0027]
When the second elastic elastic member 11 can reliably stand the barrier sheet portion below the warped intermediate point HP, and when the paper diaper is in close contact with the skin, at least In the middle part of the paper diaper in the longitudinal direction, the second elastic stretchable member 11 and the first elastic stretchable member 10 disposed at the tip fit together on the skin, so that the barrier sheet portion above the midpoint HP is turned into a planar shape. In close contact with the skin to ensure the prevention of excretion.
[0028]
On the other hand, in the example of the paper diaper described above, the side flap portion SF has a multi-layered structure of a liquid-impermeable back sheet 1 made of polyethylene or the like and a barrier sheet 4 made of non-woven fabric. It was missing. For this reason, when worn for a long time, the stuffiness became worse, especially in the summer, which was also a cause of rashes and eczema. In addition, the relatively inflexible polyethylene sheet has a problem that it is difficult to fit softly around the legs, and the wearer feels a sense of stickiness.
[0029]
Therefore, as shown in FIG. 5, the liquid-impervious backsheet 1 is formed so as to extend slightly laterally from both side edges of the absorbent body 3, and the side edges of the liquid-permeable topsheet 2 are formed. The barrier sheet 4 that is fixed at the side extending portion and that forms the barrier cuff BK is fixed along the substantially longitudinal direction of the paper diaper in a region extending from the side extending portion to the side edge of the absorber 3. The side flap portion SF may be formed by the barrier sheet portion 4B extending laterally from the fixed portion. Further, in the side flap portion SF formed by the barrier sheet 4, the barrier sheet 4 is folded back at the outer edge portion, and the elastic elastic members 8, 8... Are arranged inside the folded back to form the gasket cuff GK. . By configuring the side flap portion SF in this way, high air permeability is ensured in the portion around the leg, and stuffiness and dings are prevented. In addition, as the barrier sheet 4 used in this example, in order to prevent stuffiness, it is preferable to use a non-woven fabric that suppresses the basis weight and has excellent air permeability. Specifically, it is desirable to use a nonwoven fabric produced with a basis weight of approximately 18 to 23 g / m ² . In addition, it is desirable to use a water-repellent treated non-woven fabric coated with a silicon-based, paraffin-based metal-based, alkylchromic-chromoid water-repellent agent, etc., in order to reliably prevent the permeation of body fluids and enhance the touch to the skin. .
[0030]
[Second embodiment]
The paper diaper shown in FIG. 6 as the second embodiment is a single piece in which the front end portion of the barrier cuff BK is double-folded with a predetermined width, and is linearly arranged along the longitudinal direction of the paper diaper at the inside end of the folded back. The elastic elastic member 12 at the front end portion (or a set of plural pieces) is disposed, and the paper diaper is fixed to the standing front end side relatively at both longitudinal ends of the paper diaper, and at the middle portion in the longitudinal direction of the paper diaper. A curvilinear (or polygonal line) middle elastic elastic member 13 that is fixed to the standing fixed end side position relative to the fixing position at both ends in the longitudinal direction and protrudes outward in plan view is disposed. It is a thing.
[0031]
In this arrangement, as shown in FIG. 7, the intermediate elastic stretchable member 13 has a horizontal direction corresponding to the shift amount S of the fixing points at both ends and the intermediate portion of the paper diaper, as in the first example. a vector component H _13, acts with vertical vector component V _13, an intermediate portion of Bariyakafusu BK moves to a paper diaper width direction center side by the action force of the horizontal vector component H _13. However, since it is physically impossible to be located on the center side of the position of the tip elastic member 12, it is located below the tip elastic member 12 and above the middle elastic member 13. The seat portion stands upright or in a substantially vertical state.
[0032]
Even in this case, a lateral V-shaped pocket PK is formed by the lower barrier sheet portion of the barrier cuffs KB, and this portion can prevent the side leakage of the excretion, and has a sufficient standing height. The effective use width YB of the absorbent body can be widened while ensuring the sufficient height of the barrier cuff BK even if the paper diaper slips down after being attached. Thus, it is possible to follow almost the same effect as in the case of the first embodiment, such as being able to follow the sliding of the disposable diaper without leaving a gap therebetween.
[0033]
In this case as well, it is desirable that the shift amount S between the fixing points at both ends in the longitudinal direction of the paper diaper and the fixing points in the middle in the longitudinal direction of the paper diaper is at least 10 mm. If the shift amount S is too small, the horizontal vector component acting on the intermediate elastic member 13 will be small as will be described later, and the upper part of the intermediate elastic member member 13 is placed in a substantially vertical direction. You can't stand up.
[0034]
Further, it is preferable that the expansion / contraction force of the intermediate elastic elastic member 13 disposed in the middle of the barrier cuff BK is set larger than the elastic elastic member 12 of the distal end disposed at the distal end of the barrier cuff BK. . Specifically, the expansion / contraction force of the intermediate elastic expansion / contraction member 13 is preferably about 120 to 200% of the expansion / contraction force of the distal end elastic expansion / contraction member 12. If the elastic force of the tip elastic member 12 is too large, the vertical vector component for starting up the barrier cuff BK becomes large, and the intermediate part of the barrier cuff BK moves to the longitudinal center side of the paper diaper against this vertical vector component. It becomes difficult to make it.
[0035]
As described above, the present invention has been described with reference to the example of a tape-fixed paper diaper. However, the present invention can be applied to a pants-type paper diaper in exactly the same manner.
[0036]
【The invention's effect】
As described above in detail, according to the present invention, after the barrier cuff rises from the standing fixed end toward the inside of the absorber, the barrier cuff is inverted from the intermediate point to the outside, and then stands outward or almost vertically from the intermediate point. . Accordingly, the lateral V-shaped pocket formed by the lower barrier sheet portion can prevent the side leakage of the excrement, and the effective absorbent surface area of the absorber while ensuring the standing height of the barrier cuff. It becomes possible to take large.
[0037]
In addition, the barrier cuffs can expand and contract in the height direction, or a sufficient standing height is secured, so even if the paper diaper slips off from the wearing state, the barrier cuffs will follow this slipping and leave a gap between it and the skin. Advantages such as not being formed are also brought about at the same time.
[Brief description of the drawings]
FIG. 1 is a partially broken development view of a disposable diaper in the first embodiment.
FIG. 2 is an enlarged development view of a main part thereof.
FIG. 3 is a cross-sectional view at the center position of the disposable diaper.
FIG. 4 is a view for explaining a standing state of a barrier cuff BK.
FIG. 5 is a main part enlarged development view showing a modified example of a paper diaper.
FIG. 6 is a partially broken development view of the disposable diaper in the second embodiment.
FIG. 7 is a view for explaining a standing state of a barrier cuff BK.
FIG. 8 is a cross-sectional view of a disposable diaper showing an example of forming a conventional three-dimensional gather.
FIG. 9 is a cross-sectional view of a disposable diaper showing another example of forming a conventional three-dimensional gather.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Liquid impervious back sheet, 2 ... Liquid permeable top sheet, 3 ... Absorber, 4 ... Barrier sheet, 5 * 6 ... Elastic elastic band, 7 ... Fastening tape, 8 ... Side elastic elastic member, 10 ... 1st elastic elastic member, 11 ... 2nd elastic elastic member, 12 ... Tip elastic elastic member, 13 ... Intermediate elastic elastic member, HP ... Warping middle point, BK ... Barrier cuff (solid gather), SF ... Side Flap part, PK ... Horizontal V-shaped pocket

Claims

In the disposable paper diaper in which the absorbent body is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet, and solid gathers are formed on both sides of the paper diaper along the longitudinal direction of the paper diaper so as to protrude to the surface side.
Within the standing sheet surface of the three-dimensional gather and along the substantially longitudinal direction of the paper diaper, the longitudinally middle portion of the paper diaper is relatively fixed to the standing tip side, and the paper diaper is disposed at both longitudinal ends of the paper diaper. A first elastic expansion / contraction member in a polygonal line shape or a curved shape protruding inward in a plan view in a deployed state of the paper diaper, which is fixed to the standing fixed end side position relative to the fixing position in the middle portion in the longitudinal direction. Arrange
At the both ends of the paper diaper in the longitudinal direction, the paper diaper is fixed to the standing tip end side relatively. By arranging the second elastic expansion and contraction member in a polygonal line shape or a curved shape protruding outward in a plan view in the deployed state of the disposable diaper, the solid gathers are directed from the standing fixed end toward the inside of the absorber. A disposable paper diaper characterized in that , after standing upright , the diaper is turned outward from the middle point and raised outward .

An elastic body is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet. The elastic elastic member has a linear shape as viewed in a plan view in a developed state of the paper diaper on both sides of the paper diaper. In the disposable paper diaper in which a three-dimensional gather projecting to the surface side is formed by being arranged,
In the standing sheet surface of the three-dimensional gather and along the substantially longitudinal direction of the paper diaper, both ends in the longitudinal direction of the paper diaper are relatively fixed to the standing tip side, and the paper diaper is located in the longitudinal middle portion of the paper diaper. An intermediate elastic stretchable member that is fixed to the standing fixed end side position relative to the fixed position at both ends in the longitudinal direction and that protrudes outward in a plan view in a deployed state of the paper diaper in a polygonal line shape or curved shape. Disposable disposable diapers characterized in that, by arranging , the three-dimensional gather is erected from the standing fixed end toward the inside of the absorbent body, and then erected in a vertical or substantially vertical state from an intermediate point .

The elastic elastic member arranged in a polygonal line shape or a curved shape when viewed in a plan view in a deployed state of the disposable diaper is a shift amount between the fixing points at both ends in the longitudinal direction of the disposable diaper and the fixing points in the middle in the longitudinal direction of the disposable diaper. The disposable paper diaper according to any one of claims 1 and 2, wherein the disposable diaper is at least 10 mm.

The liquid-impervious backsheet is formed to extend slightly laterally from both side edges of the absorbent body, and is fixed at a side edge portion of the liquid-permeable top sheet and the side extending portion, and the three-dimensional The outer side of the barrier sheet forming the gathers is fixed along the substantially longitudinal direction of the paper diaper in the region extending from the side extending portion to the absorber side edge in the width direction intermediate portion, and extends outward from the fixing portion. The side flap portion is formed by the barrier seat portion, the side flap portion is folded at the outer edge portion, and the side elastic elastic member is disposed inside the folded portion to form a gasket cuff. Disposable paper diapers.