JP4130070B2

JP4130070B2 - Pants-type disposable diapers

Info

Publication number: JP4130070B2
Application number: JP2001273241A
Authority: JP
Inventors: 忍武井; 賢治安藤; 徹早瀬
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2001-09-10
Filing date: 2001-09-10
Publication date: 2008-08-06
Anticipated expiration: 2021-09-10
Also published as: JP2003079664A

Description

【０００１】
【発明の属する技術分野】
本発明は、大便後のおむつ替えを衛生的にでき、且つ、はき易くて着用感がよく、吸収性能や防漏性能に優れ、しかも見栄えのよいパンツ型使い捨ておむつに関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】
パンツ型の使い捨ておむつは高月齢児や成人失禁者等に広く利用されている。斯かるパンツ型使い捨ておむつは、通常の下着と同じように脱着できる一方で、大便を処理するときには着用者を寝かせてから側部の接合を引き裂き、大便をおむつに保持させた状態で脱がせるようになされている。このようにして大便を処理するときには、お尻の下に、展開された状態のおむつがある状態でお尻を拭くことが多いが、この際、特に高月齢児はじっとしていないことが多く、不意におむつが傾いて排泄物がおむつの外へ出てしまうことがある。また、お尻拭きの時間が長引くと、軟便の場合には幼児の背側に軟便が移行して着用者の背側を汚したり、固形便の場合には転がって背側の方からおむつ外へ落ちてしまう恐れがあった。
【０００３】
従って、本発明の目的は、大便後のおむつ替えを衛生的にでき、かつ、はき易くて着用感がよく、吸収性能や防漏性能に優れ、しかも見栄えのよいパンツ型使い捨ておむつを提供することにある。
【０００４】
【課題を解決するための手段】
本発明は、液透過性の表面シート、液不透過性の裏面シート及び液保持性の吸収体を備え、腹側部の両側縁部と背側部の両側縁部とが接合されて、一対の接合領域、ウエスト開口部及び一対のレッグ開口部が形成されており、該ウエスト開口部及び一対の該レッグ開口部に、その周縁に沿ってウエスト弾性領域及びレッグ弾性領域が形成されているパンツ型の使い捨ておむつにおいて、前記一対の接合領域を引き裂いて展開し、前記表面シート側を上方に向けて自然状態で平らな水平面上に静置した状態において、股下部に、前記吸収体が配された部位の一部が上方に隆起した隆起部が形成されており、該隆起部のおむつ幅方向中央部における最高部位の高さ（Ｈ）と、当該状態における、おむつの長手方向における直線長さ（Ｌ）とが、５％≦（Ｈ／Ｌ）×１００≦１４％の関係にあることを特徴とするパンツ型使い捨ておむつを提供することにより、上記の目的を達成したものである。
【０００５】
【発明の実施の形態】
以下、本発明をその好ましい実施形態に基づいて説明する。
本発明の一実施形態としてのパンツ型使い捨ておむつ１は、液透過性の表面シート２、液不透過性の裏面シート３及びこれら両シート間に介在された液保持性の吸収体４を備え、腹側部Ａの両側縁部と背側部Ｂの両側縁部とが互いに接合されて、一対の接合領域Ｓ，Ｓ、ウエスト開口部Ｄ及び一対のレッグ開口部Ｅ，Ｅが形成されている。
【０００６】
本実施形態の使い捨ておむつ１において、吸収体４は、中央部分が括れた砂時計状であり、表面シート２及び裏面シート３も該吸収体４の外形に合わせて略同様の形状とされている。また、表面シート２及び裏面シート３は、吸収体４の長手方向の両側縁の外方において互いに接合され、吸収体４の長手方向端縁から延出した部分において互いに接合されている。
【０００７】
裏面シート３の外側（おむつ外表面側）には、２枚の外層不織布５１，５２が配されており、該外層不織布は、吸収体４の長手方向の両端縁及び両側縁よりも使い捨ておむつの外方に向けて延出し、延出した外層不織布により、ウエスト開口部Ｄの周縁部及びレッグ開口部Ｅ，Ｅの周縁部が形成されている。そして、所定部位の２枚の外層不織布５１，５２間に、ウエスト弾性部材６、レッグ弾性部材７１，７２及び胴廻り弾性部材９が配されて、ウエスト弾性領域（ウエストギャザー）６０、環状のレッグ弾性領域（レッグギャザー）７０及び胴回り弾性領域（胴回りギャザー）９０が形成されている。尚、表面シート２、裏面シート３及び吸収体４は一体化されて吸収性本体１０を形成しており、該吸収性本体１０は、２枚の外層不織布５１，５２からなる外層体５に接合固定されている。また、吸収体４の両側縁に沿って立体ギャザー８が形成されている。
【０００８】
而して、本実施形態のパンツ型使い捨ておむつ１は、一対の接合領域Ｓ，Ｓを引き裂いて展開し、図４及び図５に示すように、その表面シート２側を上方に向けて自然状態で平らな水平面上に静置した状態（静置状態）において、股下部Ｃに、吸収体４が配された部位の一部が上方に隆起した隆起部Ｒが形成されており、該隆起部Ｒのおむつ幅方向中央部における最高部位Ｔの高さ（Ｈ）と、当該状態（静置状態）における、おむつの長手方向における直線長さ（Ｌ）とが、以下の関係式（１）を満たしている。
５％≦（Ｈ／Ｌ）×１００≦１４％・・・（１）
【０００９】
式（１）について詳細に説明する。通常、パンツ型使い捨ておむつは、股下中央部（長手方向を２等分する中央線付近）を折り返し、レッグ開口部とウエスト開口部との間に存在する側縁部を接合してパンツ型の形態を形成する。このため、股下中央部には、折り返し部（おむつ展開状態においては、折り返しによる折り癖が付いた部分）１１が形成されるので、おむつを展開して平面上においたときには、当該折り返し部１１を境として、そのおむつ長手方向前後の何れかにおいて吸収体が上方に盛り上がり、それによりおむつの股下部Ｃに、吸収体４が配された部位の一部が上方に隆起した隆起部Ｒが形成される。
おむつ替えの際には着用者のお尻を上に持ち上げてお尻を拭いたりするので、展開状態のおむつの背側部における後半部（ウエスト開口部の端縁寄りの部分）に荷重が掛かる。そのため、前記隆起部が、自然状態（すなわち、展開状態で無荷重の状態）でおむつの背側に存在する場合には、これを着用者が踏みつけているとその反動でおむつの腹側が着用者側に引きつけられ、おむつ替えの邪魔となる。また、このような場合には、傾斜が着用者側に向いてしまうので、軟便のときには該軟便が着用者側へ移行する恐れがある。一方、前記隆起部が、自然状態でおむつの腹側に存在する場合には、上述のような問題はないものの、お尻が拭きにくい。
【００１０】
本発明者らは、斯かる問題の主な原因が、前記隆起部にあることを見い出し、更に鋭意検討した結果、パンツ型使い捨ておむつの他の利点を損なうことなく、斯かる問題を解決できる条件として、前記関係式（１）を見い出した。
前記比(H/L×100)が１４％超である場合は、着用者のサイズ、特におむつの全長に対して隆起部の高さが高すぎ、該隆起部がおむつの股下中央部の前後何れにある場合においても、お尻が拭き難く、特に後方にある場合には、不衛生になりがちである。一方、前記比(H/L×100)が５％未満である場合は、折り返し部１１のおむつ内面側に大便を堰き止めるポケットＰが十分に形成されないので、粘性の高い軟便や固形便が前後へ移行して着用者の肌を不必要に汚して不衛生になりがちである。斯かる観点から、前記比(H/L×100)の好ましい範囲は、５％以上１２％以下、特に５％以上９％以下である。また、前記高さ（Ｈ）は、子供用のおむつの場合、２０〜４５ｍｍ、特に２０〜３５ｍｍであることが好ましい。
【００１１】
上記隆起部Ｒは、パンツ型使い捨ておむつを形成する際に股下中央部に形成された折り返し部１１を基端として、レッグ弾性領域７０や所望により設けられる立体ギャザー８の弾性部材、吸収体の剛性等複数の因子により吸収体４が折れ曲がることで形成される。しかし、隆起部Ｒが長手方向に大きく張り出す構成であると着用者のお尻を上に持ち上げるときに該隆起部が邪魔になってしまうため、背中までもかなり浮かせた状態にしなくてはならず、着用者にとっても、おむつ替えをする者にとっても苦痛となる。
このような不都合を防止し、おむつ替えがスムーズに行えるようにする観点から、図５に示すように、パンツ型使い捨ておむつを展開して平らな水平面に静置した状態（静置状態）において、パンツ状に形成したときの二つ折りに起因して形成される折り返し部１１から前記隆起部Ｒの長手方向最先端部１２までの直線距離（ａ）と、背側部Ｂ側のウエスト開口部の端縁１３から該折り返し部１１までの直線距離（ｂ）とが以下の関係式（２）を満たすことが好ましい。
３％≦（ａ／ｂ）×１００≦１５％・・・（２）
特に３％≦(a/b) ×100 ≦１２％、更には３％≦(a/b) ×100 ≦１０％であると、お尻を持ち上げるときに軽く脚部を持つ程度ですみ、おむつ替えをする者の負担が一層軽減されることから好ましい。
【００１２】
また、本発明者らは、隆起部Ｒの高さが吸収体４の剛性や、レッグ弾性部材７１，７２の配置の仕方又は伸縮応力によって影響を受けることを見い出した。
本実施形態の使い捨ておむつ１は、吸収体４のテーバーこわさが１〜５ｃＮ・ｃｍであり、レッグ弾性領域７０は、腹側部Ａから股下部Ｃに亘って配された第１弾性部材７１と、背側部Ｂから股下部Ｃに亘って配された第２弾性部材７２とを備えて形成されており、股下部Ｃに、第１及び第２弾性部材７１，７２が環状のレッグ弾性領域７０に配された部分からおむつ幅方向中央に向かって延出する延在部Ｆを有しており、該延在部Ｆにおける第１及び第２弾性部材７１，７２は、第１弾性部材の配設領域Ｒ１と第２弾性部材の配設領域Ｒ２とが重なるように配されており且つおむつ幅方向中央（おむつを幅方向に２等分する中央線）に達しない位置に端部７３を有している。
【００１３】
本実施形態においては、吸収体４の硬さを、テーバーこわさで１〜５ｃＮ・ｃｍという吸収体としては比較的柔らかいものとしてあり、そのため、着用時の肌触りを優しいものとすることができると共に、おむつ替えのときに吸収体４の一部に荷重が大きく掛かった場合であっても、それだけで股下中央部に存在する折り曲げ部（境）１１を基点として吸収体４が着用者の腹側へ戻ることを防止することができる。テーバーこわさ値を１ｃＮ・ｃｍ以上としたのは、吸収体が柔らかすぎると、隆起部がへたってしまい該隆起部が下方への倒れて有効なポケット構造が形成されない場合があるからである。
【００１４】
テーバーこわさは、板紙のテーバーこわさ試験機によるこわさ試験方法（ＪＩＳＰ８１２５）に記載の方法に従って測定される。具体的には、おむつから取り出した吸収体４を、３．８×７．０ｃｍの寸法に裁断し、この試験片のテーバーこわさを測定する。
【００１５】
また、従来の多くの使い捨ておむつに見られるように、股下部Ｃにレッグ弾性部材を配する場合に、その弾性部材が吸収体を幅方向に横切って配されていると、安定な隆起構造を形成しやすくなり、特に股下部の幅方向中央部では背の高い隆起部を形成してしまう。そのため、股下部においては弾性部材が吸収体を幅方向に横切らないように該弾性部材を左右に分断して配することが考えられるが、このとき幅方向に分断距離を短くして環状のレッグ弾性領域のみを形成させると、着用時には、レッグ開口部の周縁部に過大な力が掛かるため、弾性部材の抜けが生じるおそれがある。
【００１６】
本実施形態においては、股下部Ｃに、第１及び第２弾性部材７１，７２が環状のレッグ弾性領域７０に配された部分からおむつ幅方向中央に向かって延出する延在部Ｆを設けてあるため、上述したような弾性部材の抜けを防止することができる。これにより、レッグ弾性領域（レッグ開口部ギャザー）を着用時に安定して作用させることができる。
また、第１及び第２弾性部材７１，７２の端部７３が、おむつの幅方向中央に達しないようにしてあるため、股下部Ｃの幅方向中央部に弾性収縮性がなく、該股下部Ｃが幅方向に大きく収縮することを防止できるため、股下領域が広く使え、おむつ替えのときに便が側部からはみ出す心配が無くなる。
このような観点から、吸収体４上に存在する延在部Ｆの長さ（左右延在部の合計長さ，図３中のＬ１＋Ｌ１）は、股下部Ｃにおける吸収体幅Ｗ（図３参照）の５〜７０％、特に５〜６０％が好ましい。尚、Ｌ１及びＷは、図２に示すように、おむつを展開させ伸張させた状態にて測定する。また、股下部Ｃの幅方向の過度の収縮が抑制されるため、おむつの見栄えも良い。
【００１７】
また、第１及び第２弾性部材７１，７２とを、第１弾性部材７１が配された領域Ｒ１と第２弾性部材が配された領域Ｒ２とが重なるように配することにより、(1) 股下部Ｃにおける延在部Ｆの幅（弾性部材がおむつ長手方向に分散する幅）を狭くすることで、高い隆起部の形成を抑制することができ、また、(2) 着用時には、吸収体の側部が着用者側へ押し上げられるようにしてフィット感を向上させることができる。
斯かる効果の一方又は両方を一層向上させる観点から、延在部Ｆの幅（領域Ｒ１の幅＋領域Ｒ２の幅−両領域の重なり部分の幅，図３及び図６参照）Ｗ２は５〜３０ｍｍ、特に７〜２０ｍｍが好ましい。尚、Ｗ２は、図２に示すように、おむつを展開させ伸張させた状態にて測定する。
【００１８】
本実施形態の使い捨ておむつ１について更に詳述する。
延在部Ｆにおける第１及び第２弾性部材７１，７２は、図３に示すように、少なくともそれぞれの一部が吸収体４と重なっている。そのため、前記効果(1) 及び(2）が一層確実に奏される。
【００１９】
また、第１及び第２の弾性部材７１，７２は、各々複数本（図示例では３本）が配されている。また、第１弾性部材７１同士及び第２弾性部材７２同士は重なっていない状態で配されている。
更に詳述すると、第１及び第２弾性部材７１，７２は、各々帯状をなしており、股下部Ｃにおいては、図３に示すように、３本の第１弾性部材のうち最もレッグ開口部外側（周縁端側）に存在する弾性材料７１ａに対して第２弾性部材のうち最も外側の弾性材料７２ａと真中の弾性材料７２ｂとが交差し、第２弾性部材のうち最も外側の弾性材料７２ａが第１弾性部材の最も内側の弾性材料７１ｃと、第２弾性部材の真中の弾性材料７２ｂが第１弾性部材の真中の弾性材料７１ｂと各々合流し重なって延在部Ｆを形成している。一方、第２弾性部材のうち最も内側の弾性材料７２ｃは第１弾性部材のうち最も外側の弾性材料７１ａ材料と合流し重なって延在部Ｆを形成している。複数本の第１及び第２弾性部材を、このような態様で配することにより、第１及び第２弾性部材が一層抜けにくくなる。
【００２０】
上述したように、延在部８における第１及び第２弾性部材７１，７２は、それぞれおむつ幅方向中央に達しない位置に端部７３を有している。本実施形態においては、吸収体４の側部においてのみ、両弾性部材７１，７２が吸収体４に重なるようにしてある。
斯かる構成とすることにより、弾性部材の剛性によって、展開した状態の使い捨ておむつ、特にその吸収体が該弾性部材を契機にして長手方向に大きく折れ曲がることを防止することができる。
特に本発明のおむつにおいては、複数本の第１弾性部材が配設された領域Ｒ１と、複数本の第２弾性部材が配設された領域Ｒ２とが、延在部Ｆにおいては重なって存在するため、領域の重なり部分の剛性が一層高くなっている。従って、このような延在部Ｆを股下部Ｃを横断して連続的に存在させた場合には、おむつ、特に吸収体の折れ易さが助長され、高い隆起形状が作出され易くなるが、上述したように、第１及び第２弾性部材７１，７２をおむつ幅方向中央まで延在させない構成とすれば、これを防止することができる。
【００２１】
本実施形態においては、延在部Ｆにおける第１及び第２弾性部材７１，７２は、吸収体４上おいては、弾性伸縮性を発現しないようになされている。これにより、第１及び第２弾性部材が吸収体の側部において重なっているにも拘わらず、吸収体が幅方向に収縮して吸収効率を低下することを防止することができる。
また、本実施形態においては、上述したように吸収体の側部に延在部が重なって存在するので、吸収体４の幅方向の収縮を防ぎつつ、しかも前記領域Ｒ１と前記領域Ｒ２とが重なっていることによる高い剛性と、着用時に脚開口部弾性体が腹側及び背側に引っ張られる効果とによって、吸収体の両側が着用者の股下部から上方へ引っ張られてポケットを形成するので漏れ防止効果がより高くなるという効果が奏される。
更に、当該構成は、排便時のおむつ交換の際に側縁の接合部を引き剥がして脱がす時に、排便ポイントが広くかつポケット形状を形成しているために幅方向に便が漏れる恐れが少ないというメリットがある。
【００２２】
また、本実施形態の使い捨ておむつ１においては、股下部を一度横断させて配した弾性部材を、股下中央部において切断して延在部を形成しているため、特に図示しないが、該弾性部材が抜けた領域Ｎにおいては各弾性材料の抜け跡が線状に残っている。
このため、着用時には股下部Ｃにおいて延在部Ｆと相俟って弱い一筋の折れ線が生じるが、複数本の第１弾性部材が配設された領域Ｒ１と、複数本の第２弾性部材が配設された領域Ｒ２とが、延在部において重なっているので、基点部面積（前記折れ線の幅×長さ）も最小限で済むから、隆起部の高さ（Ｈ）や隆起部の張り出し長さ（ａ）を上記範囲内に制御しやすくなる。
【００２３】
本実施形態において、前記延在部は、前記使い捨ておむつを展開して伸張した状態において、おむつの長手方向中央（長手方向を２等分する中央線，図２のＧ−Ｇ線）よりも腹側部Ａ側に位置する。これによって、排便部に張り出した隆起部を形成することが容易となる。そして、腹側部Ａ側への偏倚の程度は、おむつの展開且つ伸長状態（図２参照）において、最も腹側部側に存在する弾性部材の縁部と長手方向中央との間の距離Ｄ１が、おむつ長手方向の全長Ｌ２に対して１５％以下、特に１０％以下であることが好ましい。
尚、延在部Ｆにおいて、第１弾性部材の配設領域Ｒ１と第２弾性部材の配設領域Ｒ２とが離間している場合には、その間隔分吸収性能に不利益であるし、また長手方向に広く弾性体横断領域を有するため、一方の弾性部材が不必要に腹側部に配されるか、又は股下中央部に配されることになるので、着用感が損なわれる。
【００２４】
また、本実施形態の使い捨ておむつ１における第１及び第２弾性部材７１，７２は、レッグ弾性領域７０（図２参照）においては、第１固定手段（接着剤）により隣接する外層不織布（シート材）に固定されており、レッグ弾性領域と延在部との境界部付近Ｍ（図３参照）においては、第１固定手段よりも狭い範囲に施された第２固定手段（接着剤）、又は前記第１固定手段及び第１固定手段よりも狭い範囲に施された第２固定手段により、厚み方向に隣接する外層不織布（シート材）に固定されている。
【００２５】
第１固定手段を、弾性部材に隣接するシート材の全域に亘って施し、これにより、弾性部材を完全に該シート材に固定した場合には、一旦股下部を横断させて配設した弾性部材を切断して左右に分割しようとしても、股下中央部にも弾性部材が弾性伸縮性を発現する状態で残ってしまい、本願発明の効果が奏されない恐れがある。一方、レッグ弾性領域にのみ環状に接着剤を施すことも考えられるが、レッグ開口部は着用者の動きに連動して激しく引っ張られることがあるので、着用者の活発な活動等によっては、股下中央部で切断した弾性部材の伸長状態の解除が、レッグ開口部の縁部に沿って配された部分まで及ぶゴム抜けが生じる可能性がある。
本実施形態のように第１及び第２弾性部材を固定すれば、股下中央部の弾性伸縮性を発現させないようにしつつ、ゴム抜けを防止することができる。
更に、第２固定手段を、第１固定手段よりも狭い範囲に施すことにより、他の領域において余分な接着剤に起因する硬さやごわごわ感が生じるのを防止でき、おむつの風合いを損ねないというメリットもある。
【００２６】
第２固定手段（接着剤）を施す部位Ｍは、切断した弾性部材の伸長状態が、少なくとも切断により生じた切断端部付近において解除される一方、その解除がレッグ開口部の縁部に沿って配された部分まで及ぶことを防止できるような部位であれば良い。また、第１固定手段と第２固定手段との組み合わせとしては、第１固定手段が接着剤で第２固定手段が同種又は異種の接着剤である組み合わせ、第１固定手段が接着剤で第２固定手段がヒートシールである組み合わせ等を挙げることができる。
【００２７】
本発明は、上記実施形態に制限されず種々変更可能である。例えば、股下部における第１及び第２弾性部材の配設態様は、図６に示すような態様であっても良い。本発明の使い捨ておむつにおける各部材の形成材料としては、従来の使い捨ておむつに用いられている各種公知のものを用いることができる。
【００２８】
【実施例】
〔実施例１〕
図１〜３に示す形態のパンツ型使い捨ておむつを製造した。吸収体は、テーバーこわさ（ガーレ剛性，以下「剛性」という）２ｃＮ・ｃｍのものを使用した。レッグ弾性体の股下位置は、最も腹側のもので股下折り曲げ部（長手方向中心）から３５ｍｍとし、レッグ弾性体の幅（延在部の幅Ｗ，図３及び図６参照）は１５ｍｍとした。
このパンツ型使い捨ておむつを、未使用且つ二つ折りした状態（長手方向を２等分した腹側及び背側の内面同士を密着させた状態）において、平滑な水平面上に、その背側を該水平面に当接させて静置し、その腹側から、１．５ｋｇの荷重を、おむつ全面を覆う平板によって５分間加えた。
そして、荷重を取り除いた後、側部の接合部を引き剥がして展開し、図５に示すように、裏面シート側（非肌当接面側）が水平面上に接するようにして水平面上に静置し、更に、その背側部の後半部分（おむつ替え時に着用者の体が載る部分，図５参照）に平板を載せて１．５ｋｇの荷重を加えた。
その状態において、股下部Ｃに生じた隆起部Ｒの幅方向中央部の最大高さＨ、おむつ長手方向全長Ｌ、トップシート側から測定した背側ウエスト開口部の縁端１３から折れ曲がり部１１までの直線長さｂ、当該折れ曲がり部１１から隆起部長手方向先端１２までの直線距離ａを測定した。その結果を表１に示した。
【００２９】
〔実施例２及び３〕
レッグ弾性体の股下位置を、実施例１よりも背側よりへ若干移行し、最も腹側のものの股下折り曲げ部（長手方向中心）からの距離を３０ｍｍ（実施例２）及び２７ｍｍ（実施例３）とした以外は、実施例１と同様にしてパンツ型使い捨ておむつを製造した。そして、それぞれについて、実施例１と同様にして各部の値を測定し、その結果を表１に示した。
【００３０】
〔比較例１〜４〕
下記の市販のパンツ型使い捨ておむつを用意した。
比較例１：股下部を横断する弾性部材なし、レッグ開口部に沿ってレッグ弾性部材を配置。
比較例２：股下部をレッグ弾性部材が横断、最も腹側の弾性部材の配設位置が折り曲げ部（長手方向中心）から５０ｍｍ。
比較例３：股下部を横断する弾性部材なし、レッグ開口部に沿ってレッグ弾性部材を配置。吸収体の剛性６Ｎ。
比較例４：股下部をレッグ弾性部材が横断、最も腹側の弾性部材の配設位置が折り曲げ部（長手方向中心）から４５ｍｍ、吸収体の剛性３Ｎ。
これらについて、実施例１と同様にして各部の値を測定し、その結果を表１に示した。
【００３１】
【表１】

【００３２】
＜評価＞
実施例及び比較例の各使い捨ておむつについて、以下のようにしてお尻の拭き易さ、軟便の移行阻止効果等を評価した。
各おむつを１〜２才前後の幼児に着用させ、次いで、幼児を仰向けに寝かせた状態にておむつを展開し、おむつの背側部上に幼児のお尻ないし背中が位置する状態において、お尻を拭き、そのときのお尻の拭き易さを評価した。
また、幼児の足を軽く上げて背中をおむつ背側部上に残した状態において、股下部の背側部寄りの位置（排便部）に粘性の低い軟便をのせ、次いで、幼児をおむつからどかせた後、軟便の腹側への移動の有無及び程度を観察した。
【００３３】
＜結果＞
実施例のおむつは、いずれもお尻拭きがし易かった。特に実施例１、３では、隆起部の背側方向への張り出しが抑えられているために、幼児の脚をつかんで軽く持ち上げただけでもお尻拭きができ、子供への負担が少なく、子供を嫌がらせたり暴れたりさせずに、容易におむつ替えができた。
また、軟便は、腹側に移行することなく、ポケットに保持されており、軟便の移行阻止効果に優れていた。
これに対して、比較例のおむつは、吸収体の剛性と弾性体の応力によってのみ吸収体の折れ曲がり位置が決定されており、隆起部最大高さが高かったり、隆起部の張り出しが大きく背側方向へ位置しているため、お尻拭きがしずらかったり、お尻拭きのためには、幼児のお尻を無理に持ち上げる等の工夫が必要であった。
【００３４】
【発明の効果】
本発明のパンツ型使い捨ておむつは、大便後のおむつ替えを衛生的にでき、且つ、はき易くて着用感がよく、吸収性能や防漏性能に優れ、しかも見栄えのよいものである。
尚、従来のパンツ型使い捨ておむつにおいては、パンツ型の形態にするが故にその展開状態の問題について議論されることが少なく、大便時のおむつ替えについては従来議論されてこなかった。このため、大便時の衛生的なおむつ替えという課題自体従来認識されていなかったが、本発明者らは、斯かる課題自体を見い出し、斯かる課題を解決すべく鋭意検討した結果、本発明を完成するに至ったものである。
【図面の簡単な説明】
【図１】本発明のパンツ型使い捨ておむつの一実施形態を示す斜視図である。
【図２】図１に示す使い捨ておむつの展開且つ伸張状態を示す平面図である。
【図３】図１に示す使い捨ておむつの股下部の弾性部材の配設態様を示す部分拡大平面図（上）及び該平面図のＸ−Ｘ線断面図（下）である。
【図４】図１に示す使い捨ておむつを展開して平坦な水平面上に静置した状態（静置状態）を示す斜視図である。
【図５】図４のＹ−Ｙ線模式断面図（平板を載置した状態）である。
【図６】本発明のパンツ型使い捨ておむつの他の実施形態を示す要部拡大平面図である。
【符号の説明】
１パンツ型使い捨ておむつ
２表面シート
３裏面シート
４吸収体
５外層体
６ウエスト弾性部材
６０ウエスト弾性領域（ウエストギャザー）
７レッグ弾性部材
７１第１弾性部材
７２第２弾性部材
７０レッグ弾性領域（レッグギャザー）
９胴廻り弾性部材
９０胴回り弾性領域（胴回りギャザー）
１１折り返し部
１２隆起部Ｒの長手方向最先端部
１３ウエスト開口部縁部
Ａ腹側部
Ｂ背側部
Ｃ股下部
Ｓ接合領域
Ｒ隆起部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pants-type disposable diaper that can be changed hygienically after stool, is easy to wear, has a good wearing feeling, is excellent in absorption performance and leakage prevention performance, and has a good appearance.
[0002]
[Prior art and problems to be solved by the invention]
Pants-type disposable diapers are widely used by older children and adult incontinent persons. Such a pants-type disposable diaper can be removed in the same way as normal underwear, but when handling stool, the wearer should lie down and tear the side joints so that the stool is held in the diaper. Has been made. When handling stool in this way, the butt is often wiped with the diaper unfolded under the butt, but this is often not particularly true for older children. The diaper may be tilted unexpectedly and the excrement may go out of the diaper. In addition, if the time for wiping the hips is prolonged, in the case of loose stool, the loose stool moves to the infant's back side and soils the wearer's back side, or in the case of solid stool, rolls off the diaper from the back side. There was a risk of falling.
[0003]
Therefore, an object of the present invention is to provide a pants-type disposable diaper that can be changed hygienically after stool, is easy to wear, has a good feeling of wear, has excellent absorption performance and leak-proof performance, and has a good appearance. There is.
[0004]
[Means for Solving the Problems]
The present invention includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-holding absorber, and a pair of both side edges on the ventral side and both side edges on the back side are joined together. The pants have a waist elastic region and a leg elastic region formed along the periphery of the waist opening and the pair of leg openings. In the disposable diaper of the mold, the absorbent body is disposed at the crotch portion in a state where the pair of joining regions are torn and deployed, and the surface sheet side is faced upward and left on a flat horizontal surface in a natural state. A raised portion is formed in which a part of the raised portion is raised upward, and the height (H) of the highest portion in the central portion of the raised portion in the diaper width direction and the linear length in the longitudinal direction of the diaper in this state (L) is 5 ≦ By providing a pants-type disposable diaper, characterized in that in the (H / L) × 100 ≦ 14% of the relationship is obtained by achieving the above object.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on preferred embodiments thereof.
A pants-type disposable diaper 1 as an embodiment of the present invention includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid-retaining absorbent 4 interposed between the two sheets. Both side edges of the ventral side A and both side edges of the back side B are joined together to form a pair of joint areas S, S, a waist opening D, and a pair of leg openings E, E. .
[0006]
In the disposable diaper 1 of the present embodiment, the absorbent body 4 has an hourglass shape with a central portion, and the top sheet 2 and the back sheet 3 have substantially the same shape according to the outer shape of the absorbent body 4. Further, the top sheet 2 and the back sheet 3 are joined to each other outside the both side edges in the longitudinal direction of the absorbent body 4, and joined to each other at a portion extending from the longitudinal edge of the absorbent body 4.
[0007]
Two outer layer

nonwoven fabrics

51 and 52 are disposed on the outer side (the outer surface side of the diaper) of the back sheet 3, and the outer layer nonwoven fabrics are disposed in the disposable diaper rather than the both end edges and both side edges in the longitudinal direction of the absorbent body 4. A peripheral edge of the waist opening D and a peripheral edge of the leg openings E, E are formed by the outer layer nonwoven fabric extending outward. A waist elastic member 6, leg

elastic members

71 and 72, and a waist elastic member 9 are arranged between the two outer layer

nonwoven fabrics

51 and 52 at a predetermined site, and a waist elastic region (waist gather) 60 and an annular leg elasticity. A region (leg gather) 70 and a waistline elastic region (waistline gather) 90 are formed. The top sheet 2, the back sheet 3 and the absorbent body 4 are integrated to form an absorbent main body 10, and the absorbent main body 10 is bonded to the outer layer body 5 composed of two outer layer

nonwoven fabrics

51 and 52. It is fixed. A solid gather 8 is formed along both side edges of the absorber 4.
[0008]
Thus, the pants-type disposable diaper 1 of the present embodiment tears and unfolds the pair of joining regions S, S, and is in a natural state with its topsheet 2 side facing upward as shown in FIGS. In the state of standing on a flat horizontal surface (stationary state), the crotch part C is formed with a raised portion R in which a part of the portion where the absorber 4 is arranged is raised upward, and the raised portion The height (H) of the highest part T in the central part of the diaper width direction of R and the linear length (L) in the longitudinal direction of the diaper in the state (stationary state) are expressed by the following relational expression (1). Satisfies.
5% ≦ (H / L) × 100 ≦ 14% (1)
[0009]
Formula (1) will be described in detail. Usually, a pants-type disposable diaper has a pants-type configuration in which the crotch center part (near the center line that bisects the longitudinal direction) is folded back and the side edges existing between the leg opening and the waist opening are joined. Form. For this reason, a folded portion (a portion with folded folds in the diaper unfolded state) 11 is formed in the crotch central portion. Therefore, when the diaper is unfolded and placed on a plane, the folded portion 11 is As a boundary, the absorbent body bulges upward in either the longitudinal direction of the diaper, thereby forming a raised portion R in which a part of the portion where the absorbent body 4 is disposed is raised upward in the crotch part C of the diaper. The
When changing diapers, the butt of the wearer is lifted up and wiped, so the load is applied to the rear half of the unfolded diaper (the part near the edge of the waist opening). . Therefore, when the raised portion is present on the back side of the diaper in a natural state (that is, in an unloaded state), when the wearer steps on the diaper, the belly side of the diaper is moved by the reaction to the wearer. It is attracted to the side and disturbs changing diapers. In such a case, since the inclination is directed toward the wearer, the loose stool may move toward the wearer when the stool is soft. On the other hand, when the raised portion is present on the ventral side of the diaper in a natural state, the butt is difficult to wipe, although there is no problem as described above.
[0010]
The present inventors have found that the main cause of such a problem lies in the raised portion, and as a result of further intensive studies, the conditions under which such a problem can be solved without impairing other advantages of the pants-type disposable diaper. As a result, the relational expression (1) was found.
When the ratio (H / L × 100) is more than 14%, the height of the raised portion is too high with respect to the size of the wearer, particularly the overall length of the diaper, and the raised portion is around the crotch center of the diaper. In any case, it is difficult to wipe the buttocks, especially when it is behind, it tends to be unsanitary. On the other hand, when the ratio (H / L × 100) is less than 5%, the pocket P for damming the stool is not sufficiently formed on the inner surface side of the diaper of the folded portion 11, so that soft stools and solid stools with high viscosity are The wearer's skin is unnecessarily soiled and unsanitary. From such a viewpoint, a preferable range of the ratio (H / L × 100) is 5% to 12%, particularly 5% to 9%. In addition, the height (H) is preferably 20 to 45 mm, particularly 20 to 35 mm in the case of a diaper for children.
[0011]
The raised portion R has a leg elastic region 70 and an elastic member of the three-dimensional gather 8 provided as required, and the rigidity of the absorber, with the folded portion 11 formed in the crotch center when forming the pants-type disposable diaper. It is formed by the absorber 4 being bent by a plurality of factors such as. However, if the raised portion R is configured to protrude greatly in the longitudinal direction, the raised portion becomes an obstacle when the wearer's buttocks is lifted upward, so that the back must be kept quite floating. Therefore, it is painful for both the wearer and those who change diapers.
From the viewpoint of preventing such inconvenience and allowing the diaper to be changed smoothly, as shown in FIG. 5, in a state where the pants-type disposable diaper is unfolded and allowed to stand on a flat horizontal surface (static state), The linear distance (a) from the folded portion 11 formed due to the two-fold when formed into a pants shape to the longitudinal most distal portion 12 of the raised portion R, and the waist opening on the back side B side It is preferable that the linear distance (b) from the edge 13 to the turned-up portion 11 satisfies the following relational expression (2).
3% ≦ (a / b) × 100 ≦ 15% (2)
Especially when 3% ≤ (a / b) x 100 ≤ 12%, and further 3% ≤ (a / b) x 100 ≤ 10%, it is enough to have a light leg when lifting the buttocks, diapers It is preferable because the burden on the person who performs the replacement is further reduced.
[0012]
Further, the present inventors have found that the height of the raised portion R is affected by the rigidity of the absorber 4, the manner in which the leg

elastic members

71 and 72 are arranged, or the stretching stress.
The disposable diaper 1 of the present embodiment has a Taber stiffness of the absorbent body 4 of 1 to 5 cN · cm, and the leg elastic region 70 includes a first elastic member 71 arranged from the ventral side A to the crotch C, And a second elastic member 72 disposed from the back side B to the crotch C, and the first and second

elastic members

71 and 72 are annular leg elastic regions in the crotch C. 70 has an extending portion F extending from the portion disposed in the direction toward the center of the diaper width direction, and the first and second

elastic members

71 and 72 in the extending portion F are formed of the first elastic member. The arrangement portion R1 and the arrangement region R2 of the second elastic member are arranged so as to overlap with each other, and the end 73 is located at a position that does not reach the center of the diaper width direction (a center line that bisects the diaper in the width direction). Have.
[0013]
In the present embodiment, the hardness of the absorbent body 4 is relatively soft as an absorbent body of 1 to 5 cN · cm in Taber stiffness, so that it can be made gentle to the touch when worn, Even when a large load is applied to a part of the absorbent body 4 at the time of changing diapers, the absorbent body 4 moves toward the wearer's ventral side with the bent portion (boundary) 11 existing at the center of the crotch as a base point. Returning can be prevented. The reason why the Taber stiffness value is 1 cN · cm or more is that if the absorber is too soft, the bulging portion may be bent and the bulging portion may fall downward to form an effective pocket structure.
[0014]
Taber stiffness is measured according to the method described in the stiffness test method (JIS P 8125) using a paperboard Taber stiffness tester. Specifically, the absorbent body 4 taken out from the diaper is cut into a size of 3.8 × 7.0 cm, and the Taber stiffness of the test piece is measured.
[0015]
In addition, as seen in many conventional disposable diapers, when a leg elastic member is disposed in the crotch part C, if the elastic member is disposed across the absorbent body in the width direction, a stable raised structure can be obtained. It becomes easy to form, and in particular, a tall bulge is formed at the center in the width direction of the crotch. Therefore, in the crotch part, it can be considered that the elastic member is divided into left and right so that the elastic member does not cross the absorbent body in the width direction. If only the elastic region is formed, an excessive force is applied to the peripheral edge of the leg opening when worn, and the elastic member may come off.
[0016]
In the present embodiment, the crotch portion C is provided with an extending portion F in which the first and second

elastic members

71 and 72 extend from the portion disposed in the annular leg elastic region 70 toward the center in the diaper width direction. Therefore, the elastic member as described above can be prevented from coming off. Thereby, a leg elastic area | region (leg opening part gather) can be made to act stably at the time of wear.
Further, since the end portions 73 of the first and second

elastic members

71 and 72 do not reach the center in the width direction of the diaper, the width direction center portion of the crotch portion C is not elastically contractible, and the crotch portion Since C can be prevented from being greatly contracted in the width direction, the crotch region can be used widely, and there is no fear that the stool protrudes from the side when changing diapers.
From such a viewpoint, the length of the extending portion F existing on the absorber 4 (the total length of the left and right extending portions, L1 + L1 in FIG. 3) is the absorber width W in the crotch C (see FIG. 3). 5 to 70%, particularly 5 to 60%. Note that L1 and W are measured in a state where the diaper is expanded and extended as shown in FIG. Moreover, since the excessive shrinkage | contraction of the width direction of the crotch part C is suppressed, the appearance of a diaper is also good.
[0017]
Further, by arranging the first and second

elastic members

71 and 72 so that the region R1 where the first elastic member 71 is arranged and the region R2 where the second elastic member is arranged overlap, (1) By narrowing the width of the extending part F in the crotch part C (the width in which the elastic member is dispersed in the longitudinal direction of the diaper), it is possible to suppress the formation of a high raised part, and (2) A feeling of fit can be improved by pushing up the side part to the wearer side.
From the viewpoint of further improving one or both of such effects, the width of the extending portion F (the width of the region R1 + the width of the region R2−the width of the overlapping portion of both regions, see FIGS. 3 and 6) W2 is 5 to 5. 30 mm, particularly 7 to 20 mm is preferable. Note that W2 is measured in a state where the diaper is unfolded and extended as shown in FIG.
[0018]
The disposable diaper 1 of this embodiment is further explained in full detail.
As shown in FIG. 3, at least a part of each of the first and second

elastic members

71 and 72 in the extending portion F overlaps the absorber 4. Therefore, the effects (1) and (2) are more reliably achieved.
[0019]
Further, a plurality (three in the illustrated example) of the first and second

elastic members

71 and 72 are arranged. Further, the first elastic members 71 and the second elastic members 72 are arranged so as not to overlap each other.
More specifically, the first and second

elastic members

71 and 72 each have a belt shape, and the crotch part C has the most leg opening portion among the three first elastic members as shown in FIG. The outermost elastic material 72a of the second elastic member and the middle elastic material 72b intersect the elastic material 71a existing on the outer side (periphery end side), and the outermost elastic material 72a of the second elastic member. Are the innermost elastic material 71c of the first elastic member and the middle elastic material 72b of the second elastic member merge with the middle elastic material 71b of the first elastic member to form an extension F. . On the other hand, the innermost elastic material 72c of the second elastic member joins and overlaps with the outermost elastic material 71a of the first elastic member to form the extending portion F. By arranging a plurality of first and second elastic members in this manner, the first and second elastic members are more difficult to come off.
[0020]
As described above, the first and second

elastic members

71 and 72 in the extending portion 8 each have the end portion 73 at a position that does not reach the center of the diaper width direction. In the present embodiment, both

elastic members

71 and 72 overlap the absorber 4 only at the side of the absorber 4.
By setting it as such a structure, it can prevent that the disposable diaper of the expand | deployed state, especially the absorber is bent greatly in a longitudinal direction triggered by this elastic member by the rigidity of an elastic member.
Particularly in the diaper of the present invention, the region R1 in which a plurality of first elastic members are disposed and the region R2 in which a plurality of second elastic members are disposed overlap in the extending portion F. Therefore, the rigidity of the overlapping portion of the regions is further increased. Therefore, when such an extending portion F is continuously present across the crotch portion C, the diaper, in particular, the absorbent body is easily broken, and a high raised shape is easily created. As described above, if the first and second

elastic members

71 and 72 are configured not to extend to the center of the diaper width direction, this can be prevented.
[0021]
In the present embodiment, the first and second

elastic members

71 and 72 in the extending portion F are configured not to exhibit elastic stretchability on the absorber 4. Thereby, it can be prevented that the absorbent body contracts in the width direction and the absorption efficiency is lowered although the first and second elastic members are overlapped at the side of the absorbent body.
Further, in the present embodiment, as described above, since the extending portion overlaps with the side portion of the absorber, the region R1 and the region R2 are prevented from contracting in the width direction of the absorber 4, and Because of the high rigidity due to the overlapping and the effect that the leg opening elastic body is pulled to the abdomen and back when worn, both sides of the absorber are pulled upward from the crotch of the wearer to form a pocket There is an effect that the leakage prevention effect becomes higher.
Furthermore, when the diaper is changed during defecation, this configuration is less likely to leak stool in the width direction because the defecation points are wide and have a pocket shape when the side edge joint is peeled off and removed. There are benefits.
[0022]
Further, in the disposable diaper 1 of the present embodiment, the elastic member that has been arranged by traversing the crotch part once is cut at the crotch central part to form an extended part. In the region N from which the elastic material is removed, the traces of the elastic materials remain in a linear shape.
For this reason, when worn, a weak broken line is formed in the crotch C together with the extending portion F, but the region R1 in which the plurality of first elastic members are disposed and the plurality of second elastic members are Since the disposed region R2 overlaps with the extended portion, the base portion area (width × length of the broken line) can be minimized, so that the height (H) of the raised portion and the protruding portion of the raised portion are increased. It becomes easy to control the length (a) within the above range.
[0023]
In the present embodiment, the extending portion is abdominal than the center of the diaper in the longitudinal direction (center line that bisects the longitudinal direction, line GG in FIG. 2) in a state where the disposable diaper is expanded and stretched. Located on side A side. This makes it easy to form a raised portion that protrudes from the defecation portion. The degree of bias toward the ventral side A is the distance D1 between the edge of the elastic member present on the most ventral side and the center in the longitudinal direction when the diaper is deployed and extended (see FIG. 2). However, it is preferable that it is 15% or less with respect to the full length L2 of a diaper longitudinal direction, especially 10% or less.
In addition, in the extended part F, when the arrangement | positioning area | region R1 of 1st elastic member and the arrangement | positioning area | region R2 of 2nd elastic member are spaced apart, it is disadvantageous for absorption performance by the space | interval, Since it has an elastic body crossing region widely in the longitudinal direction, one elastic member is unnecessarily disposed on the abdominal side or on the crotch center, so that the feeling of wearing is impaired.
[0024]
Moreover, the 1st and 2nd

elastic members

71 and 72 in the disposable diaper 1 of this embodiment are the outer-layer nonwoven fabric (sheet material) which adjoins by the 1st fixing means (adhesive) in the leg elastic area | region 70 (refer FIG. 2). In the vicinity of the boundary M between the leg elastic region and the extending portion (see FIG. 3), the second fixing means (adhesive) applied in a narrower range than the first fixing means, or The first fixing means and the second fixing means provided in a narrower range than the first fixing means are fixed to the outer nonwoven fabric (sheet material) adjacent in the thickness direction.
[0025]
When the first fixing means is applied over the entire area of the sheet material adjacent to the elastic member, and the elastic member is thus completely fixed to the sheet material, the elastic member once disposed across the crotch Even if it is cut and divided into left and right, the elastic member remains in the crotch center part in a state expressing the elastic stretchability, and there is a possibility that the effect of the present invention is not achieved. On the other hand, it may be possible to apply an adhesive only to the leg elastic region, but the leg opening may be pulled hard in conjunction with the movement of the wearer, so depending on the active activity of the wearer, There is a possibility that the release of the stretched state of the elastic member cut at the central portion may cause rubber removal extending to the portion arranged along the edge of the leg opening.
If the first and second elastic members are fixed as in the present embodiment, it is possible to prevent the rubber from coming out while preventing the elastic stretchability of the crotch center part from being exhibited.
Furthermore, by applying the second fixing means in a narrower range than the first fixing means, it is possible to prevent the hardness and the stiff feeling caused by the extra adhesive in other regions, and the texture of the diaper is not impaired. There are also benefits.
[0026]
In the region M where the second fixing means (adhesive) is applied, the stretched state of the cut elastic member is released at least in the vicinity of the cut end produced by the cut, while the release is along the edge of the leg opening. Any part can be used as long as it can prevent reaching the part. As a combination of the first fixing means and the second fixing means, the first fixing means is an adhesive and the second fixing means is the same or different kind of adhesive, and the first fixing means is an adhesive and the second fixing means. The combination etc. which a fixing means is a heat seal can be mentioned.
[0027]
The present invention is not limited to the above embodiment and can be variously modified. For example, the arrangement form of the first and second elastic members in the crotch part may be as shown in FIG. As a forming material of each member in the disposable diaper of the present invention, various known materials used in conventional disposable diapers can be used.
[0028]
【Example】
[Example 1]
The underpants type disposable diaper of the form shown in FIGS. 1-3 was manufactured. The absorber used was a Taber stiffness (Gurley stiffness, hereinafter referred to as “rigidity”) 2 cN · cm. The crotch position of the leg elastic body is the most abdomen, 35 mm from the crotch bent part (longitudinal direction center), and the width of the leg elastic body (width W of the extension part, see FIGS. 3 and 6) is 15 mm. .
In a state in which this pants-type disposable diaper is unused and folded in two (a state in which the inner surfaces of the abdomen and the back side, which are divided into two in the longitudinal direction, are in close contact with each other), the back side is placed on the horizontal surface Then, a load of 1.5 kg was applied from the ventral side for 5 minutes by a flat plate covering the entire surface of the diaper.
Then, after removing the load, the side joints are peeled off and deployed, and as shown in FIG. 5, the back sheet side (non-skin contact surface side) is in contact with the horizontal plane so as to be static on the horizontal plane. Further, a flat plate was placed on the latter half of the back side (the part on which the wearer's body rests when changing diapers, see FIG. 5), and a load of 1.5 kg was applied.
In that state, the maximum height H in the widthwise central portion of the raised portion R generated in the crotch portion C, the overall length L in the diaper longitudinal direction, from the edge 13 of the back waist opening measured from the top sheet side to the bent portion 11 The straight line length b and the straight line distance a from the bent portion 11 to the ridge portion longitudinal tip 12 were measured. The results are shown in Table 1.
[0029]
[Examples 2 and 3]
The crotch position of the leg elastic body is slightly shifted from the back side to Example 1, and the distance from the crotch bent portion (center in the longitudinal direction) of the most abdomen is 30 mm (Example 2) and 27 mm (Example 3). Except for the above, a pants-type disposable diaper was produced in the same manner as in Example 1. And about each, the value of each part was measured like Example 1, and the result was shown in Table 1.
[0030]
[Comparative Examples 1-4]
The following commercially available pants-type disposable diapers were prepared.
Comparative example 1: There is no elastic member crossing the crotch part, and the leg elastic member is disposed along the leg opening.
Comparative Example 2: The leg elastic member crosses the crotch part, and the arrangement position of the most abdomen elastic member is 50 mm from the bent part (center in the longitudinal direction).
Comparative Example 3: There is no elastic member crossing the crotch, and the leg elastic member is disposed along the leg opening. Absorber stiffness 6N.
Comparative Example 4: The leg elastic member crosses the crotch part, the disposition position of the most abdomen elastic member is 45 mm from the bent part (longitudinal direction center), and the rigidity of the absorber is 3N.
About these, the value of each part was measured like Example 1, and the result was shown in Table 1.
[0031]
[Table 1]

[0032]
<Evaluation>
About each disposable diaper of an Example and a comparative example, the ease of wiping of the buttocks, the transition prevention effect of a loose stool, etc. were evaluated as follows.
Each diaper is worn by an infant about 1 to 2 years old, then the diaper is unfolded with the infant lying on its back, and the baby's buttocks or back is located on the back side of the diaper. The butt was wiped, and the ease of wiping the butt at that time was evaluated.
Also, with the infant's foot slightly lifted and the back left on the back side of the diaper, place a soft stool with low viscosity on the back side of the crotch (defecation part) and then remove the infant from the diaper. After squeezing, the presence and extent of loose stool migration to the ventral side were observed.
[0033]
<Result>
All of the diapers of the examples were easy to wipe ass. In particular, in Examples 1 and 3, since the protrusion of the raised portion in the back side direction is suppressed, it is possible to wipe the hips just by grabbing the infant's leg and lifting it lightly. I was able to change diapers easily without harassing or rampaging.
Moreover, the soft stool was held in the pocket without moving to the ventral side, and was excellent in the soft stool transfer prevention effect.
In contrast, in the diaper of the comparative example, the bending position of the absorber is determined only by the rigidity of the absorber and the stress of the elastic body, and the maximum height of the bulge is high, or the bulge of the bulge is large. Because it is located in the direction, it was difficult to wipe the hips, and in order to wipe the hips, it was necessary to devise such as forcibly lifting the buttocks of the infant.
[0034]
【The invention's effect】
The pants-type disposable diaper of the present invention can hygienically change diapers after stool, is easy to wear, has a good wearing feeling, is excellent in absorption performance and leakage prevention performance, and has a good appearance.
In the conventional pants-type disposable diaper, since it is in a pants-type form, there is little discussion about the problem of its unfolded state, and diaper change during stool has not been discussed in the past. For this reason, the problem of sanitary diaper change at the time of stool has not been recognized per se, but the present inventors have found such a problem itself and intensively studied to solve such a problem. It has come to be completed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a pants-type disposable diaper of the present invention.
FIG. 2 is a plan view showing a deployed and extended state of the disposable diaper shown in FIG.
FIG. 3 is a partially enlarged plan view (upper) showing an arrangement of elastic members at the crotch part of the disposable diaper shown in FIG. 1 and a cross-sectional view taken along line XX of the plan view (lower).
4 is a perspective view showing a state in which the disposable diaper shown in FIG. 1 has been developed and left on a flat horizontal surface (static state). FIG.
5 is a schematic cross-sectional view taken along the line YY of FIG. 4 (a state in which a flat plate is placed).
FIG. 6 is an enlarged plan view of a main part showing another embodiment of the pants-type disposable diaper of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 5 Outer layer 6 Waist elastic member 60 Waist elastic area (waist gather)
7 Leg elastic member 71 First elastic member 72 Second elastic member 70 Leg elastic region (leg gather)
9 Girth elastic member 90 Girth elastic region (girth gather)
DESCRIPTION OF SYMBOLS 11 Folding part 12 Longitudinal most advanced part 13 of ridge part R Waist opening edge part A Abdominal side part B Back side part C Crotch part S Joint area | region R Protrusion part

Claims

A liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent body, both side edges of the abdominal part and both side edges of the back part are joined together, a pair of joining regions, A waist opening and a pair of leg openings are formed, and a waist elastic region and a pair of leg elastic regions are formed along the periphery of the waist opening and the pair of leg openings. In disposable diapers,
In a state where the pair of joining regions are torn and expanded, and the surface sheet side is faced upward and is left standing on a flat horizontal surface in a natural state, a part of the portion where the absorber is disposed on the crotch portion is A bulge portion is formed that bulges upward, and the height (H) of the highest portion in the diaper width direction central portion of the bulge portion, and the linear length (L) in the longitudinal direction of the diaper in this state, The following relational expression (1) is satisfied,
5% ≦ (H / L) × 100 ≦ 14% (1)
The absorber has a Taber stiffness of 1 to 5 cN · cm, and the leg elastic region is arranged from the abdominal side part to the crotch part and from the back side part to the crotch part. The first and second elastic members extend from the portion arranged in the annular leg elastic region toward the center of the diaper width direction at the crotch portion. The first elastic member and the second elastic member in the extending portion are arranged so that the arrangement region of the first elastic member and the arrangement region of the second elastic member overlap each other, and It has an end at a position that does not reach the center of the diaper width direction,
In the leg elastic region, the first and second elastic members are fixed to the adjacent sheet material by the first fixing means, and in the vicinity of the boundary between the portion forming the leg elastic region and the extending portion. The pants-type disposable diaper fixed to the adjacent sheet material by the second fixing means applied in a narrower range than the first fixing means, or by the first fixing means and the second fixing means .

In the stationary state, the linear distance (a) from the folded portion formed due to the two-fold when formed in a pants shape to the most distal end in the longitudinal direction of the raised portion, and the waist on the back side portion side The pants-type disposable diaper according to claim 1, wherein a linear distance (b) from an edge of the opening to the folded portion satisfies the following relational expression (2) .
3% ≦ (a / b) × 100 ≦ 15% (2)

It said first and second elastic members in the extending portion is at least partially Claim overlaps the absorber 1 or 2 pants type disposable diaper according.

The first and second elastic members according to any one of claims 1 to 3 , wherein the first and second elastic members are sandwiched between two sheets that are separate from the back sheet and are disposed outside the back sheet. Pants-type disposable diaper.

The pants-type disposable diaper according to any one of claims 1 to 4, wherein a plurality of first and second elastic members are provided, and the first elastic members and the second elastic members do not overlap each other.