JP3573761B2 - Pant-shaped sanitary products with a new elastic composite in the elastic part - Google Patents

Description

【０００９】
【発明が解決しようとする課題】
それでは、吸収機能などの機能の低下をまねくことなく、しかもコストアップをもたらすことなく、これらの問題を解決するには、なんらかの手段により腰部の端末部の基材と弾性体とも直接接触させることなく、弾性体のもつ伸縮力を１００％利用することができれば理想的である。それに近いやり方とは、いわば端末部基材から弾性体を浮かすようにつり下げるフローティング構造を保つことが望ましい。フローティング構造を形成するためには図３８の上に示すように支点はできるだけ少い方がよいが、全領域に渡って均等な伸縮分布をもたせるためには図３８の下に示すように支点の数も必要になる。これらの支点の間隔については用いられる弾性体の性能、腰部端末部の性状によって異なってくる。
【００１０】
本発明では、このようなフローティング構造を保って弾性体を取付けることによって、オムツの吸収機能はなんら損うことなく、十分な弾性機能をもたせ、しかもこのような構成のものを安価に提供するものである。
【００１１】
【課題を解決するための手段】
本発明は、シート状弾性体の両面又は片面に、不織布基材を互いに平行で連続的な複数の結合部位（Ａ）のみで結合することにより、シート状弾性体の緩和状態において、隣接する各接合部位（Ａ）の間に互いに平行で連続的な不織布基材のひだを形成する非結合部(Ｂ)を有するように複合してなり、前記不織布基材とシート状弾性体の結合部位（Ａ）と非結合部位（Ｂ）との割合を示すＡ／（Ａ＋Ｂ）×１００％が５０％以下であり、かつ伸長状態での結合部間の長さＱ、緩和状態での結合部分の長さＰとの比Ｑ／Ｐが１．５以上である弾性複合体を、パンツの伸縮所望部位と不織布基材において接合させてなることを特徴とする弾性複合体を伸縮部に備えたパンツ状生理用品である。
【００１２】
これを具体的に図面によって説明すると、図１において、端末部とは、前述したオムツにおけるＡ，Ｂ，Ｃ，Ｅ部に相当し、これに弾性体を複数の支点によって吊った状態を示しているが、本発明ではこの状態を実現するために端末部に、緩和状態の弾性体の片側に不織布基材がひだを形成するように結合部において結合されている弾性体と不織布基材との弾性複合体を接合させることによって、ひだの部分が上記の支点に相当するフローティング構造を形成する。これをフローティングギャザーという。しかしこの場合は、弾性体面が人体の肌に直接接触することとなり、必ずしも快適でない場合がある。これを防ぐために、図２に示すように、表面シートと弾性体との間に同じようなフローティング構造を形成させればよい。そのためには上記図１と同様の不織布基材を弾性体の両面に形成すればよい。この場合には、不織布基材自体が肌触りがよいので、表面シートは必ずしも貼着しなくてもよい。
【００１３】
そのためには、緩和状態の弾性体の両側に不織布基材がひだを形成するように結合されてなる弾性体と不織布基材との弾性複合体を接合させることによってフローティングギャザーを形成させることができる。このようなフローティングギャザーをパンツの伸縮所望部位例えば腰部端末部に形成するには、図３に示すような工程を経て行なわれる。すなわち、パンツの腰部端末部（１）に対して弾性複合体（２）を用意する。その弾性複合体を緊張して、（３）に示すように、その緊張弾性複合体を緊張下で腰部端末部と不織布基体側で接合する。この接合体の緊張状態を緩和すると（４）に示すフローティングギャザーが形成される。
【００１４】
フローティングギャザーの性能は用いられる両側にひだを有する弾性複合体の性能によって決定づけられる。まずこの弾性複合体について説明する。
【００１５】
弾性複合体とは図４に示したように不織布１１，１２にシート状弾性体１３を部分的に接合してなる複合体であり、この弾性複合体の性能は構成する素材即ちひだになる不織布部分１１，１２と芯になる弾性体１３とその接合状態即ち接合面積とひだの深さによって決定される。
【００１６】
まず構成する素材について説明する。
【００１７】
不織布部分を構成する不織布にはさまざまなタイプ、即ち乾式、湿式、スパンボンド、水流交絡法、メルトブローン等の後述のような製法によって、不織布の適切な選択が必要になる。いわゆる延伸ラミネート法による場合には伸びの少ない不織布が用いられ、特開昭５９−５９９０１（ＵＳ ５０２３６６）の方法による場合には縦あるいは横方向に伸びの大きな不織布を用いるのが好ましい。 両面を形成する不織布は使用する状態、接着性、肌への刺激性等によって不織布の素材を変えてもよいが、均一な収縮状態を保つには両側が同じ素材が望ましい。芯になるシート状弾性体は、いわゆるゴム弾性を持つ素材から選ばれるが、それらは天然ゴム、合成ゴム、ポリウレタン類、ポリオレフィンエラストマー類から単独あるいは複合ブレンドして構成されるフィルム状、不織布状、フォーム状等のシート状の弾性体である。
【００１８】
しかし本発明のフローティングギャザーの特徴は弾性体の本来持つ性能を十二分に発揮できることにあり、比較的コストの安い融点が低く、自己接着を起こしやすくしかも扱いにくいポリオレフィン系エラストマーが本発明には好んで用いられる。
【００１９】
それらは例えばＥ．Ｖ．Ａ．ＶＬＬＤＰＥ，エチレン・プロピレンエラストマー，エチレン・メチルアクリシートエラストマー，ＳＥＢＳ等の単独フィルムあるいはポリマーブレンドフィルム，あるいは上記ウレタンとポリオレフィン系エラストマーとの共押出しフィルム等である。それは本発明の特徴である不織布との複合により、大幅にハンドリング性能が向上するためである。
【００２０】
ついで不織布と弾性体の接合状態について説明する。
【００２１】
図５で示すように不織布と弾性体の接合部位（Ａ）と非接合部位（Ｂ）とから構成され、接合部と非接合部との割合を示すＡ／Ａ＋Ｂ×１００（％）は５０％以下、好ましくは４０％〜５％が望ましい。更に望ましくは４０％〜１０％である。５％未満では接合強度を維持することが難しく、又５０％を越えると伸縮性を損なう結果となる。
【００２２】
図６，図７はそれぞれ緩和状態と伸長状態を示したものであり、伸縮能力の尺度となる、不織布のひだの長さ（Ｑ）と弾性体の緩和時の長さ（Ｐ）の割合Ｑ／Ｐで示されるがその値は１．５以上あることが必要であり、好ましくは２．０〜４．０である。１．５未満であると弾性体としての魅力の乏しいものであり、４．０を越えるのは理論上可能であるとしても実使用上の意味は少ない。
【００２３】
弾性体に接合された不織布の形態は図８，図９に示すように、その接合のピッチ、ひだの深さ等はさまざまに変えることは可能であるが、一般的には上面、下面の不織布とも同じピッチ、同じ深さを保つことが効率的である。しかし後述するように、オムツの腰部の構成材との接合を行う場合、腹部、背部に相当する部分と側端部との伸長状態を調節するために、ひだの深さを変えることや、腰部材料との接合強度を大きくし、一方フローティングギャザーとしての機能を十分に発揮する目的で、接合に関与する側のひだの深さを、接合に関与しない側のひだの深さに対して深くすることも有効な方法である。
【００２４】
弾性体に対する上部不織布と、下部不織布の接合点の相対的位置は生産性や装置精度上許容されるかぎりほぼ一致させることが望ましい。
【００２５】
しかし、後述する弾性体の存在状態によっては、この相対的位置関係は、あまり重要ではない。この間の理由を明確にするため、まず弾性体の存在状態について説明する。
【００２６】
上下両面のひだを有する不織布に対して、芯になる弾性体は図１０に示す一層である場合が一般的であるが、図１１に示すように多層である場合もある。これはたとえば片側にひだを有するような弾性体を弾性体面で重ね合わせたり、接合したりした場合である。その接合状態は、その接合面に自由度を持つような接合が理想的であり、離れない程度の比較的弱い接合状態を保つことによって、良好な伸縮弾性を保つことができる。たとえば部分的な接着さらに望ましくは前述したようなポリオレフィン系エラストマーの比較的低融点エラストマーの有する自己接着による自着性を利用すると極めて良好な伸縮性を有する両面にひだを有する複合弾性体が得られる。その材質、状態を示したのが表２である。すなわち、単一層の弾性体の両面の不織布の接合点の位置を変えると、弾性複合体の伸縮性は著しく阻害されるが、２層の自着性により重ね合わされた弾性体の場合は両面の不織布の接合点を変えても殆ど影響がない。
【００２７】
【表２】

【００２８】
伸縮性のコントロールをするために部位によって伸長度をかえた弾性複合体の組合せの例として、側端部（上下端部）と中央とを伸長度をかえる場合について説明する。
【００２９】
表３は伸長状態と緩和状態とそれに伴う伸長限界を示したものである。例えば側端部を低伸縮部、中央部に高伸縮部を配するようにするには、図１２のような接合構造を持つ弾性複合体を利用することによって、両端部は伸縮率が小さく、中央部が伸縮率の大きな構造の複合弾性体が得られる。
【００３０】
【表３】

【００３１】
上述した弾性複合体と求める製品本体の必要とされる部位に対する接合について説明する。表４は弾性体をオムツの腰部に接合した場合の伸長前（Ｌ_１）と伸長後（Ｌ_２）と前後の伸長率を比較したものである。
【００３２】
【表４】

【００３３】
（１）はいわゆる市販のオムツに見られるようなストレッチ ラミネートで得られる状態であり、（２）と（３）は全く同じ構造を持った片側にひだを持った弾性体を（２）は通常の方法で接合した場合、（３）はひだを持った不織布側フローティング構造を持つように接合した場合であり、（４）は両側にひだを持った本発明の弾性複合体を接合した場合を示す。接合方法によって（２）のような効果しか持たないものが、フローティング構造を持たせることによって（３）、（４）のように大幅に伸長率の増大を見せることがよくわかる。これが本発明のフローティング・ギャザーの一番大きな特徴である。
【００３４】
本発明になる弾性複合体と製品本体部位と結合させて、フローティング構造を持った弾性体を形成する場合、図１３の▲１▼のように弾性複合体のどちらかの片面の不織布のひだ部分と結合し、他の不織布は露出させて、そのソフトでパルキーな不織布の感触を利用する場合もあるが、▲２▼のように両側の不織布に結合する場合もある。
【００３５】
製品本体部位と不織布部分との結合状態はその結合面積を変えることによって、弾性複合体のひだ構造を製品本体部位に転写することも可能である。その状態を示したのが図１４である。製品本体部位と不織布部分との結合状態はその結合面積を加えることによって、弾性複合体のひだ構造を製品本体部位に転写することも可能である。その状態を示したのが図１４である。
【００３６】
本発明になるフローティング状弾性体に用いられる弾性複合体の製造例について説明する。
【００３７】
製造すべき弾性複合体は、その使用部位、目的によって縦方向に伸縮性を持つものと、横方向に伸縮性を持つものに分けられる。図１５はそれを模式的に示したものである。図１５（ａ）は縦方向に伸縮性をもち、たとえばオムツの股ギャザー部に用いられ、図１５（ｂ）は横方向に伸縮性をもち、たとえば腰部ギャザー部に用いられる。さてこれら弾性複合体の製造法の１つとしては図１６に示したような工程で製造する場合であって、その製造プロセスとしては図１７に示したものになる。即ち弾性基材をロール１４、ロール１５で引き出し、ロール１４、１５とロール１６、１７との間のスピードをかえて伸長する。伸長状態で不織布を上、下に重ね合せたのち凸起を有し、しかも加熱された図１８のようなパターンを持ったロール１８、１９を用いて、横方向に間欠的に熱結合あるいは超音波接着を行う。これを緩和すると本発明に用いられる弾性複合体が得られる。図１９に示した工程は伸長性の不織布の特性を利用した製法であって、製造プロセスとしては図２０に示したものになる。
【００３８】
即ち弾性部材を芯にして２枚の不織布を供給する。その状態で図２１で示すような表面を持った加熱突起ロールを通過させ、冷却ロールにより構造固定したのち、延伸ロールにより不織布伸長限界に近い点まで延伸する。そののち緩和すると本発明に用いられる弾性複合体が得られる。図２２に示した工程は片側にのみひだのある弾性複合体をまずつくり、それを２枚接合することによって、両側にひだを持つ弾性複合体をつくる方法である。この方法のフローシートは図２２に示したが、まず緩和した状態の片側にひだを持った弾性複合体をつくり、それをまた伸長し、弾性部材面相互を結合し、緩和する方法であるが、図２２の矢印で示すように、まず片側に不織布基材と弾性基材とを部分結合し、伸長時に２層を結合する方法もある。しかし更に簡単な工程は図２３に示すように部分結合した不織布と弾性部材との結合体をそのまま２層を弾性部材面で接合しそののち伸長、緩和すれば極めて簡単に目的とする弾性複合体が得られる。図２４の工程は上記部分結合した不織布と弾性部材との結合体の連続製造法を示した。即ち２１、２２より溶融押出しされた弾性部材を２３で冷却後、不織布を圧着ののち図２５のようなグリッド表面を持った加熱ロール２６を通過させると、不織布と弾性部材の結合体が得られる。この結合体を２層接合後伸長、緩和すれば目的とする弾性複合体が得られる。
【００３９】
上述した弾性複合体を用いひだになった不織布と製品本体とを結合すれば、いわゆるフローティング構造を持った弾性体が得られるわけであるが、工業的製造工程への応用例を図で説明しておく。
【００４０】
図２６は紙おむつ製造時の股部ギャザー部の形成に際して、縦方向に伸縮性を有する本発明になる弾性複合体を応用する工程図の一例を示したものである。
【００４１】
即ちテープ状にスリットした弾性複合体を伸長下で、弾性複合体の不織布部分と紙おむつの股部に接する位置のサイドフラップの表面材とを、たとえば公開平３−２１８７５２のような形でホットメルトを用いて接着させると、伸縮性に極めてすぐれたフローティング股ギャザーが形成される。
【００４２】
図２７は紙おむつの製造時の腰部ギャザー部の形成に際して、横方向に伸縮性を有する本発明になる弾性複合体を応用する工程図の一例を示したものである。即ち横方向に短冊状に切断した弾性複合体をベルトにより両端部を把持しながら、横方向に拡張しつつ伸長し、把持した状態を保ちつつ、おむつ腰部に相当する部位にホットメルトを用いて接合する。その後に腰部相当部を切離し、緊張をとり除くと伸縮性に極めてすぐれたフローティング腰部ギャザーが形成される。
【００４３】
なお、工業的な取扱いの効率性を考えた場合、弾性複合体と製造工程と当該弾性複合体を製品への結合工程とは判然と区別されるべきものでなく、弾性複合体の製造工程の一部を製品本体への結合工程を持ちこむことも重要である。実施例２にはその例を示している。
【００４４】
以下実施例によって説明する。
【００４５】
【実施例】
実施例１
｛弾性複合体｝
弾性基材としてポリエーテルポリウレタン樹脂フィルム２０ｍμを芯にしてＳＥＢＳ樹脂（三菱油化製ラバロン）フィルム約１５μを両側に３層押出しフィルムの約５０μの厚さを持つフィルム１４ロールを用意する。本フィルムは破断伸度が縦方向４２０％であった。同時にこのフィルムは良好な超音波シール性を持つ。不織布部材として乾式スポットボンドＰ，Ｐ不織布（米社ベルデックス社製）２０Ｒ／ｍ^２を２ロール用意する。この不織布の縦方向破断伸度は３８％であった。図１７のようなプロセスによりロール１４（約２０ｍ／ｍｉｎ）、ロール１５（約６０ｍ／ｍｉｎ）の間で上記弾性部材を約３倍に伸長し、ロール１６、１７のところに弾性部材をサンドイッチするように上、下２層の不織布を供給する。この３層シートを回転式超音波融着装置（ブランソン社製）を備え、アンビルに２５ｍ／ｍ間隔にグリットをもつロールを用意し、約６２ｍ／ｍｉｎの速度で通過させ、伸長状態で巻き取った。この３層部分結合シートを切りとりＴｅｎｔｉｏｎ Ｆｒｅｅの状態で緩和させたところ、縦方向の限界伸長率は１８５％を有する両側にひだを有する弾性複合体が得られた。なお、結合部の面積比｛（Ａ＋Ｂ）／Ａ｝×１００（％）は約２０％、Ｑ／Ｐは約２．７倍であった。
【００４６】
｛弾性複合体と製品本体との結合｝
製品として市販の紙おむつ（ＰＧ社製パンパースＭサイズ）の外側の線状ギャザーを除去し、ギャザー形成部になるサイドクラップ部位の上層トップシートと上記弾性複合体の不織布のひだ部分とをひだを伸長する状態で永久粘着型ホットメルト接着剤により結合させた。その股部に形成されたギャザーは約１８０％の伸長率を持ち、殆ど弾性複合体の性能が損なわれることがなかった。約３０ピースをつくり赤ちゃん５名でテストし、母親にインタビューしたところもれも少なく極めて表面がソフトであるとの結果を得た。
【００４７】
実施例２
｛弾性複合体｝
弾性部材としてＥ．Ｕ．ＡとＢｕｔａｄｉｅｎｅを主成分とするポリオレフィンエラストマー（東燃化学製ラプレーズ）を用いてインフレーション法により３０μの厚さをもつ筒状のフィルムを成形する。この弾性部材は破断伸度５２０％であり、フィルムを重ね合わせて圧搾すると自己接着を容易に起こすような性質を持っている。
【００４８】
インフレーションした筒状フィルムをそのまま巻きとりロール状で保存する。一方伸長性不織布は次のようにして製造される。
【００４９】
即ちＰ，Ｐ（ポリプロピレン）のＳｉｄｅ ｂｙ ｓｉｄｅ型Ｃｏｎｊｕｇａｔｅ繊維（チッソ社製ＥＳ複合繊維）２ｄ×５１ｍ／ｍからランダム状繊維ウエブ（ヘルゲス社製ランダムカード）を開孔ベルトで高圧水流で処理し、繊維相互と交絡された不織布を製造する。これを加圧脱水後１３０℃の熱気乾燥機中を１．６倍にオードフィードした状態で通過させる乾燥収縮を起こし極めて伸長性に富んだ不織布が得られた。この不織布の破断伸度は１９０％であった。この不織布を２ロール用意する。
【００５０】
図１９に示したフローシートにより上記弾性部材を芯にして上、下に２層の伸長性不織布をサンドイッチした状態で、図２０、２１のようなプロセスと表面を持った１００℃に加熱されたロール間を３０ｍ／ｍｉｎ．の速度で通過させ、横しま状の熱接着パターンを有する３層の複合シートが得られた。熱接着部分（Ａ）は３ｍ／ｍ、未接着部分（Ｂ）は８ｍ／ｍであった。この複合シートを約２．５倍に伸長したところ未接着部分が不織布と弾性部材ともに伸長された。この状態の複合シートをテンションを除き緩和させると約１５０％程度の伸長性を有する弾性複合体が得られる。Ｑ／Ｐは約２．５倍であった。この弾性複合体は弾性部材が２層になり、相互が自着状に接合されており、その両側に不織布のひだが形成された構造を持っていた。
【００５１】
｛弾性複合体の製品部位への結合｝
上記のような工程で得られる、伸長前の不織布と弾性部材との複合シートをスリットして、テープ状に加工したロール状に巻取ったシートを得た。（伸長後巻取ると、伸長テンションにより弾性部材が応力緩和を生起し経時的に伸縮性を喪失する。一方伸長後の緩和状態の複合弾性体を無緊張で巻取ると極めてバルキーなものになり経済性にそぐわない。）
上述したような１５ｍ／ｍのテープ状シートを図２７に示すような工程で、上記複合シートを２．４倍に伸長しながら、所定の長さに切断して、オムツの股ギャザー相当部位に不織布面とおむつの表面材料とをホットメルトで接着したのち、無緊張状態にしたところ１４０％の伸長性を有する伸縮の極めてすぐれた弾性体が得られた。
【００５２】
実施例３
｛弾性複合体｝
弾性部材としてＶ．Ｌ．Ｌ．Ｄ．Ｐ．Ｅを主成分とするポリオレフィンエラストマー弾性シート（三井東圧化学製）を溶融ダイスからの押出し成形により３０ｍのフィルムを成形する。このフィルムは縦方向に延伸されていて、縦方向（ＭＤ）の破断伸度は１８０％前後であったが、横方向（ＣＤ）の破断伸度は４２０％で極めて横方向に伸縮しやすい構造を持っていた。
【００５３】
一方不織布としてポリプロピレン繊維（大和紡製）２．２ｄ×４５ｍ／ｍから約３５ｇ／ｍ^２のパラレル状（ホリングスワース社製タンデムマスターカード使用）のウエブを多数の組孔と脱水ゾーンを備えた円柱状シリンダー上で、高圧の水流（５０〜６０ｋｇ／ｃｍ^２）で繊維相互を交絡させ、後乾燥すると２５ｇ／ｍ^２のソフトな感触を有する不織布が得られる。この不織布は縦方向の破断伸度は約５８％であったが、横方向の破断伸度は２２０％であり極めて横方向に伸長しやすい構造を持っていた。図２４で示したようなプロセスにより上記弾性部材を溶融押出し後のフィルムを約５０ｍ／ｍｉｎで冷却後まず上記不織布をロールに導き不織布とフィルムを圧着するとフィルムと不織布が仮圧着状態に至る。この複合シートを片側に図２５に示すようなグリット状に加熱ロールを通過させた。表面が約１１０℃に加熱された溝付ロールは不織布側から接触させた。結合部（Ａ）は約２ｍ／ｍ非結合部の巾（Ｂ）は約６ｍ／ｍであった。これによって不織布と弾性フィルム部材が部分的線状に熱結合された複合シートが得られる。これを横方向に伸長すると約２．８倍（１８０％）まで伸長され、これを無緊張状態にして緩和すると片側に不織布のひだを有する伸縮性に極めてすぐれた弾性複合体が得られる。Ｑ／Ｐは約２．８倍であった。
【００５４】
上記連続して得られる複合シートは伸長することなく、そのまま巻とり５００ｍ巻ロールを製造した。このロールからは不織布層があるため自着することなく安定に再巻出しが可能であった。このシートを切取り、露出している弾性部材面を重ね合わせるように、２枚を重ね合わせ常温で圧着すると、フィルム同志が自着状態を起こし接合した。この重ね合わせた状態で横方向に伸長すると約２．７倍伸長され（１７０％）た。これを無緊張状態にして緩和すると両側に不織布ひだを有する伸縮性に極めてすぐれた弾性複合体が得られた。
【００５５】
｛弾性複合体の製品部位への結合｝
上記複合シートをスリットして、約巾１８０ｍ／ｍのシートロール２本を用意する。１８０ｍ／ｍのシート２枚を弾性部材を接合するように２枚重ね合わせ、加圧すると２枚のシートは自着現象により仮接着状態となる（図２８）。
【００５６】
次に両側端部から３０ｍ／ｍの部分を１２０℃の表面平滑な表面ロールで両サイドを加熱加圧すると図２９のように両サイド３０ｍ／ｍの部分は完全に熱圧着され、中央部１２０ｍ／ｍは仮接着状態の複合シートを図２７のようなプロセスによって巾５０ｍ／ｍの短冊状に切断しつつ、両側端の圧着部をベルトに挿んで全体が約２倍になるように横に拡張、伸長した。その変化を図３０に示した。伸長により両端の３０ｍ／ｍ（６０ｍ／ｍ）は伸長せず中央の１２０ｍ／ｍの部分が約３００ｍ／ｍ即ち２．５倍に伸長された。その伸長状態のまま連続的に走行する使い捨てのおむつの腰部相当部位の表面材に、弾性複合体の不織布を結合させ、更に側端３０ｍ／ｍの完全圧着に結束具である粘着テープをとりつけ、単一おむつに切断、緊張をとりのぞき緩和すると極めて良好な伸縮性を有する弾性体とテープを備えた腰部構造を持った子供用おむつが製造された。
【００５７】
【発明の効果】
本発明は、オムツの如きパンツ型生理用品において、その伸縮所望部位に新規な弾性複合体を配して、スムースな伸縮性を得ると共に安価に提供することができるものである。
【図面の簡単な説明】
【図１】本発明のフローティングギャザーの構成の説明図である。
【図２】本発明のフローティングギャザーの他の構成の説明図である。
【図３】フローティングギャザーの製造の説明図である。
【図４】弾性複合体の構成の説明図である。
【図５】弾性複合体の結合部とひだ部との関係の説明図である。
【図６】弾性複合体の緩和と伸長の関係の説明図である。
【図７】弾性複合体の緩和と伸長の説明図である。
【図８】弾性複合体の構成の変化例の説明図である。
【図９】弾性複合体の構成の変化例の説明図である。
【図１０】弾性複合体の構成の説明図である。
【図１１】弾性複合体の他の構成の説明図である。
【図１２】中央部が高伸縮、両端部が低伸縮部の弾性複合体の説明図である。
【図１３】弾性複合体と製品本体との結合状態の説明図である。
【図１４】弾性複合体と製品主体との結合状態の説明図である。
【図１５】弾性複合体の縦方向と横方向伸縮性の説明図である。
【図１６】弾性複合体の製造工程の説明図である。
【図１７】弾性複合体の製造装置の説明図である。
【図１８】製造装置におけるロールの説明図である。
【図１９】弾性複合体の他の製造法の説明図である。
【図２０】弾性複合体の他の製造装置の説明図である。
【図２１】製造装置におけるロールの説明図である。
【図２２】弾性複合体の他の製造法の説明図である。
【図２３】弾性複合体の他の製造法の説明図である。
【図２４】弾性複合体の他の製造装置の説明図である。
【図２５】弾性複合体の他の製造装置のロールの説明図である。
【図２６】オムツ製造時の股部ギャザー部形成の応用例を示す説明図である。
【図２７】オムツギャザー部の応用に際して伸長する方式の説明図である。
【図２８】弾性複合体の仮接合の説明図である。
【図２９】両サイドを低伸縮部とした弾性複合体の説明図である。
【図３０】中央部と両端部と伸縮度の違う例の変化の状態を示す説明図である。
【図３１】従来のオムツの一例の説明図である。
【図３２】従来のオムツの他の例の説明図である。
【図３３】図３１の従来のオムツの構成の概念図である。
【図３４】図３２の従来のオムツの構成の概念図である。
【図３５】従来のオムツの各部の構成の説明図である。
【図３６】図３１の従来のオムツの伸張前後の態様の説明図である。
【図３７】図３２の従来のオムツの伸張前後の態様の説明図である。
【図３８】フローティング構造の概念の説明図である。
【符号の説明】
１ 弾性体
２ 弾性体
３ 腰部端末部
４ 腰部端末部
５ 結束部
６ 弾性体
７ 弾性体
１１ 不織布
１２ 不織布
１３ 弾性体[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a sanitary product, for example, a diaper for children, a diaper for adults, and a pants-type incontinence product, which is a pants-type sanitary product having a novel elastic composite in its elastic portion.
[0002]
[Prior art]
As an example of a sanitary product having a waist with a commercially available elastic body, a child's diaper will be described as an example. Department 5 with a structure as shown in FIG. 31 and a binding like underwear Department It is roughly divided into those having a structure as shown in FIG. That is, as shown in the left diagram of FIG. 31, reference numerals 1 and 2 denote elastic bodies at the back and abdomen, respectively, which are connected to the front and rear waist terminals 3 and 4 and bound to the waist end of the back. Department No. 5 binding tape. This unity Department Are turned into pants as shown in the right figure of FIG. One hand Department As shown in FIG. 32, elastic members 6 and 7 are provided over the entire region of the back and abdominal terminal portions in the type without the stomach.
[0003]
The schematic configuration of the waist of the diaper shown in FIGS. 31 and 32 is as shown in FIGS. 33 and 34. That is, considering the range in which the elastic body is provided in the waist, when the back A, the abdomen B, the waist end C, the binding unit D, and the both sides E,
1) Products with elastic bodies only in A, B, C, D, and E
2) A + B, A + C, A + D, A + E Product with elastic body over two parts
3) A product with an elastic body over three parts A + B + C and A + B + E
Can be considered.
[0004]
Lumbar terminal A product having an elastic property in the part C is already marketed as a hinge tape, but since it is different from the object of the present invention, the part D is excluded. In a product having a binding portion as shown in FIG. 31, it is necessary to optimize the elasticity of the portion A + C or A + B + C in FIG. 33 in order to optimize the configuration of the elastic body. However, the lumbar terminal part in contact with the abdomen of B is united Department It is not desirable to increase the elasticity and increase the deformation because of having a portion (tape landing zone) to which is fixed. Therefore unity Department In the case of a product provided with, the elasticity of A + C in FIG. 33 is optimized.
[0005]
FIG. 35 shows a cutaway view of A, B, and C portions. Now, in order to optimize the elasticity of A + C, it is necessary to bring the A and C parts into a state in which the parts A and C can contract and expand, but the part A is affected by the absorber having a hard structure as shown in FIG. Due to the resistance of the back sheet and the top sheet joined by the hot melt and the hot melt, it is extremely difficult to make the state of expansion and contraction. The portion C is more likely to shrink than the portion A, but has a resistance.
[0006]
Unity as shown in Fig. 32 Department In order to optimize the conformation of the elastic body even in a product without the above, it is necessary to optimize the elasticity of the portion A + B + C in FIG. For this purpose, the portions A, B, and C must be brought into a state in which they can be expanded and contracted, but as shown in FIG. 35, A and B are joined by a hot melt so as to be able to be added to the hard absorber. It is extremely difficult to provide a stretched state due to the resistance of the back sheet and the top sheet. The portion C is easily contracted as compared with the portion A, but has a resistance. Therefore, how to eliminate such influences of the portions A, B, and C is the biggest problem in designing a diaper having a truly functioning elastic body.
[0007]
Various attempts have been made to impart sufficient elasticity to A, B, and C to provide reversibility as shown in FIGS. The main concept is shown in Table 1 below.
[0008]
[Table 1]

[0009]
[Problems to be solved by the invention]
To solve these problems without impairing the functions such as the absorption function and increasing the cost, without directly contacting the base material of the terminal part of the waist and the elastic body by any means, It is ideal if 100% of the elasticity of the elastic body can be used. It is desirable to maintain a floating structure in which the elastic body is suspended so as to float from the terminal portion base material. In order to form a floating structure, the number of fulcrums should be as small as possible as shown in the upper part of FIG. 38. However, in order to have a uniform expansion and contraction distribution over the entire area, the fulcrum as shown in the lower part of FIG. You also need a number. The distance between these fulcrums depends on the performance of the elastic body used and the properties of the waist end.
[0010]
In the present invention, by providing an elastic body while maintaining such a floating structure, a sufficient elastic function can be provided without impairing the absorbing function of the diaper at all, and moreover, such a structure is provided at a low cost. It is.
[0011]
[Means for Solving the Problems]
The present invention is applicable to both sides or one side of a sheet-like elastic body. , The nonwoven fabric substrate is bonded only at a plurality of parallel and continuous bonding sites (A). Join By doing In the relaxed state of the sheet-like elastic body, The non-woven base material and the sheet-like elastic body are combined so as to have a non-bonded portion (B) that forms a fold of a continuous non-woven base material between adjacent bonding sites (A). A / (A + B) × 100% indicating the ratio between the binding site (A) and the non-binding site (B) is 50% or less, and the length Q between the binding portions in the extended state and the binding in the relaxed state The elastic composite having a ratio Q / P to the length P of the portion of 1.5 or more is joined to the desired stretchable portion of the pants and the nonwoven fabric base material. hand Characterized by becoming Bullet It is a pants-like sanitary product provided with an elastic composite in an elastic part.
[0012]
This will be described in detail with reference to the drawings. In FIG. 1, the term “terminal portion” corresponds to portions A, B, C, and E in the diaper described above, and shows a state in which an elastic body is suspended by a plurality of fulcrums. However, in the present invention, in order to realize this state, at the terminal portion, the elastic body and the nonwoven fabric base material are bonded at the joining portion so that the nonwoven fabric base material forms a fold on one side of the elastic body in the relaxed state. By joining the elastic composite, the fold forms a floating structure corresponding to the above-mentioned fulcrum. This is called floating gather. However, in this case, the elastic body surface comes into direct contact with the skin of the human body, which may not always be comfortable. In order to prevent this, as shown in FIG. 2, a similar floating structure may be formed between the topsheet and the elastic body. For this purpose, a nonwoven fabric substrate similar to that shown in FIG. 1 may be formed on both sides of the elastic body. In this case, since the nonwoven fabric substrate itself has a good touch, the topsheet does not necessarily have to be attached.
[0013]
For this purpose, a floating gather can be formed by joining an elastic composite of an elastic body and a nonwoven fabric base, which are formed by forming a non-woven fabric base on both sides of an elastic body in a relaxed state and forming a fold. . In order to form such a floating gather at a desired stretchable portion of the pants, for example, at a waist end, a process shown in FIG. 3 is performed. That is, the elastic composite (2) is prepared for the waist end portion (1) of the pants. As shown in (3), the elastic composite is tensioned so that the tensioned elastic composite is not in tension with the lumbar terminal. Weave Join on the fabric substrate side. When the tension of the joined body is relaxed, a floating gather shown in (4) is formed.
[0014]
The performance of floating gathers is determined by the performance of the elastic composite with double folds used Zu Be killed. First, the elastic composite will be described.
[0015]
As shown in FIG. 4, the elastic composite is a composite obtained by partially bonding the sheet-like elastic body 13 to the nonwoven fabrics 11 and 12, and the performance of this elastic composite is a constituent material, that is, a nonwoven fabric that becomes a fold. It is determined by the elastic body 13 serving as the core with the parts 11 and 12 and the joint state thereof, that is, the joint area and the pleat depth.
[0016]
First, the constituent materials will be described.
[0017]
For the non-woven fabric constituting the non-woven fabric portion, an appropriate selection of the non-woven fabric is required by various types, that is, a dry method, a wet method, a spun bond, a hydroentanglement method, a melt blown method and the like as described below. In the case of the so-called stretch lamination method, a non-woven fabric with little elongation is used, JP In the case of the method of Sho 59-59901 (U.S. Pat. No. 5,023,366), it is preferable to use a nonwoven fabric having a large stretch in the vertical or horizontal direction. The material of the nonwoven fabric forming both sides may be changed depending on the state of use, adhesiveness, irritation to the skin and the like, but the same material is preferably used on both sides in order to maintain a uniform shrink state. The sheet-like elastic body serving as the core is selected from materials having a so-called rubber elasticity, and they are made of natural rubber, synthetic rubber, polyurethanes, polyolefin elastomers alone or in a composite blend, and are in the form of a film, nonwoven, It is a sheet-like elastic body such as a foam.
[0018]
However, the feature of the floating gather of the present invention is that the inherent performance of the elastic body can be sufficiently exhibited, and the polyolefin elastomer which is relatively inexpensive, has a low melting point, easily causes self-adhesion, and is difficult to handle is used in the present invention. Used favorably.
[0019]
They are, for example, E.I. V. A. A single film or a polymer blend film of VLLDPE, ethylene / propylene elastomer, ethylene / methyl acryl sheet elastomer, SEBS, or the like, or a co-extruded film of the urethane and the polyolefin-based elastomer. This is because the handling performance is greatly improved by the combination with the nonwoven fabric which is a feature of the present invention.
[0020]
Next, the joining state of the nonwoven fabric and the elastic body will be described.
[0021]
As shown in FIG. 5, A / A + B × 100 (%), which is composed of a bonded portion (A) and a non-bonded portion (B) between the nonwoven fabric and the elastic body, and indicates the ratio between the bonded portion and the non-bonded portion, is 50%. Below, preferably 40% to 5% is desirable. More preferably, it is 40% to 10%. If it is less than 5%, it is difficult to maintain the bonding strength, and if it exceeds 50%, the elasticity is impaired.
[0022]
FIGS. 6 and 7 show the relaxed state and the stretched state, respectively. The ratio Q of the fold length (Q) of the nonwoven fabric and the relaxed length (P) of the elastic body, which is a measure of the elasticity, is shown. The value is required to be 1.5 or more, preferably 2.0 to 4.0. When it is less than 1.5, it is less attractive as an elastic body, and when it exceeds 4.0, it is theoretically possible, but has little meaning in practical use.
[0023]
As shown in FIGS. 8 and 9, the form of the nonwoven fabric bonded to the elastic body can be varied in various ways such as the pitch of the bonding and the depth of the folds. Same pitch and same depth One It is efficient. However, as will be described later, when joining with the diaper waist component, in order to adjust the stretched state of the abdomen, the portion corresponding to the back and the side end, changing the depth of the fold, For the purpose of increasing the bonding strength with the material and at the same time fully exhibiting the function as a floating gather, the depth of the fold on the side participating in the bonding is made deeper than the depth of the fold on the side not participating in the bonding. This is also an effective method.
[0024]
It is desirable that the relative positions of the joining points of the upper nonwoven fabric and the lower nonwoven fabric with respect to the elastic body be almost the same as long as the productivity and the precision of the apparatus allow.
[0025]
However, this relative positional relationship is not so important depending on the state of the elastic body described later. In order to clarify the reason during this time, first, the state of the elastic body will be described.
[0026]
The elastic body serving as the core of the nonwoven fabric having the upper and lower folds is generally a single layer as shown in FIG. 10, but may be a multilayer as shown in FIG. This is the case, for example, when an elastic body having a fold on one side is overlapped or joined on the elastic body surface. The bonding state is ideally such that the bonding surface has a degree of freedom, and by maintaining a relatively weak bonding state that does not separate, good stretch elasticity can be maintained. For example, if the self-adhesiveness of the polyolefin-based elastomer, which is relatively low-melting-point elastomer as described above, is used, it is possible to obtain a composite elastic body having folds on both sides having extremely good stretchability. . Table 2 shows the materials and conditions. That is, if the position of the joining point of the nonwoven fabric on both sides of the single-layered elastic body is changed, the elasticity of the elastic composite is significantly impaired, but in the case of the two-layered self-adhesive elastic body, Changing the joining point of the nonwoven fabric has almost no effect.
[0027]
[Table 2]

[0028]
As an example of a combination of elastic composites having different degrees of expansion depending on the portions in order to control elasticity, a case where the degree of expansion is changed between a side end (upper / lower end) and the center will be described.
[0029]
Table 3 shows the extended state, the relaxed state, and the associated extension limit. For example, in order to arrange a low elastic portion at the side end portion and a high elastic portion at the center portion, by using an elastic composite having a joint structure as shown in FIG. A composite elastic body having a structure in which the center has a large expansion / contraction ratio is obtained.
[0030]
[Table 3]

[0031]
A description will be given of the joining of the above-described elastic composite and a required part of the product main body to a required portion. Table 4 shows that before the elastic body was joined to the waist of the diaper, ₁ ) And after extension (L ₂ ) And the elongation ratio before and after.
[0032]
[Table 4]

[0033]
(1) is a state obtained by stretch lamination as seen in a so-called commercial diaper, (2) and (3) are elastic bodies with the same structure and pleated on one side, and (2) is usually (3) is the case where the nonwoven fabric side has a floating structure with folds, and (4) is the case where the elastic composite of the present invention with folds on both sides is bonded. Show. It can be clearly understood that the one having only the effect as in (2) by the joining method shows a drastic increase in the elongation as shown in (3) and (4) by providing the floating structure. This is the most significant feature of the floating gather of the present invention.
[0034]
When an elastic body having a floating structure is formed by combining the elastic body according to the present invention with a product main body part, as shown in (1) of FIG. In some cases, the other non-woven fabric is exposed and the feel of the soft and parky non-woven fabric is used. In other cases, the non-woven fabric is bonded to both non-woven fabrics as shown in (2).
[0035]
The bonding area between the product body and the non-woven fabric Strange Thus, the fold structure of the elastic composite can be transferred to the product main body. FIG. 14 shows this state. The fold structure of the elastic composite can be transferred to the product main body portion by adding the bonding area between the product main body portion and the nonwoven fabric portion. FIG. 14 shows this state.
[0036]
A production example of the elastic composite used for the floating elastic body according to the present invention will be described.
[0037]
Elastic composites to be produced are classified into those having elasticity in the vertical direction and those having elasticity in the horizontal direction depending on the use site and purpose. FIG. 15 schematically illustrates this. FIG. 15 (a) has elasticity in the vertical direction, for example, used for a diaper crotch gather portion, and FIG. 15 (b) has elasticity in the lateral direction, for example, is used for a waist gather portion. Now, one of the manufacturing methods of these elastic composites is a case of manufacturing by the steps shown in FIG. 16, and the manufacturing process is as shown in FIG. That is, the elastic base material is pulled out by the rolls 14 and 15, and is stretched while changing the speed between the rolls 14 and 15 and the rolls 16 and 17. In a stretched state, the nonwoven fabric is superimposed on the upper and lower sides, and then has a protruding portion, and is further intermittently thermally bonded or superimposed in the lateral direction using rolls 18 and 19 having a heated pattern as shown in FIG. Perform sonic bonding. When this is alleviated, the elastic composite used in the present invention is obtained. The process shown in FIG. 19 is a manufacturing method utilizing the characteristics of an extensible nonwoven fabric, and the manufacturing process is as shown in FIG.
[0038]
That is, two nonwoven fabrics are supplied with an elastic member as a core. In this state, the nonwoven fabric is passed through a heating projection roll having a surface as shown in FIG. 21 and fixed in structure by a cooling roll. After relaxation, the elastic composite used in the present invention is obtained. The process shown in FIG. 22 is a method of first forming an elastic composite having only one side with a fold, and joining the two pieces to form an elastic composite having folds on both sides. The flow sheet of this method is shown in FIG. 22. First, an elastic composite having a fold on one side in a relaxed state is formed, and it is stretched again, and the surfaces of the elastic members are joined and relaxed. As shown by arrows in FIG. 22, there is also a method in which a nonwoven fabric base and an elastic base are partially bonded to one side first, and two layers are bonded at the time of elongation. However, as shown in FIG. 23, the simpler process is to join the two-layered union of the non-woven fabric and the elastic member as they are on the surface of the elastic member, and then stretch and relax the elastic member. Is obtained. The step of FIG. 24 shows a continuous production method of a combined body of the above-mentioned partially bonded nonwoven fabric and elastic member. That is, after the elastic member melt-extruded from 21 and 22 is cooled by 23, the nonwoven fabric is pressed and passed through a heating roll 26 having a grid surface as shown in FIG. 25, whereby a combined body of the nonwoven fabric and the elastic member is obtained. . If the combined body is stretched and relaxed after joining the two layers, the desired elastic composite can be obtained.
[0039]
If the pleated nonwoven fabric and the product body are joined using the above-described elastic composite, an elastic body having a so-called floating structure can be obtained. Keep it.
[0040]
FIG. 26 shows an example of a process diagram of applying the elastic composite according to the present invention, which has elasticity in the vertical direction, when forming the crotch gather portion during the manufacture of a disposable diaper.
[0041]
That is, while the elastic composite slit into a tape shape is stretched, the non-woven fabric portion of the elastic composite and the surface material of the side flap at the position in contact with the crotch portion of the disposable diaper are subjected to hot melt in a form as disclosed in, for example, Japanese Unexamined Patent Publication No. 3-218755. When gluing is performed using the above, a floating crotch gather having extremely excellent elasticity is formed.
[0042]
FIG. 27 shows an example of a process diagram of applying the elastic composite according to the present invention, which has elasticity in the lateral direction, when forming the waist gather portion at the time of manufacturing a disposable diaper. That is, while holding both ends by a belt, the elastic composite cut into strips in the horizontal direction is expanded while expanding in the horizontal direction, and while holding the gripped state, using a hot melt at a portion corresponding to the waist of the diaper. Join. After that, the waist-corresponding part is cut off and the tension is removed to form a floating waist gather with excellent elasticity.
[0043]
Considering the efficiency of industrial handling, the elastic composite, the manufacturing process, and the step of bonding the elastic composite to the product should not be clearly distinguished, and the manufacturing process of the elastic composite should not be distinguished. It is also important to bring in a step of joining a part to the product body. The second embodiment shows an example.
[0044]
Hereinafter, an embodiment will be described.
[0045]
【Example】
Example 1
｛Elastic composite｝
A film 14 roll having a thickness of about 50 μm of a three-layer extruded film of about 15 μm on both sides of a SEBS resin (Lavalon manufactured by Mitsubishi Yuka) with 20 μm of polyether polyurethane resin film as a core as an elastic base material is prepared. This film had a breaking elongation of 420% in the machine direction. At the same time, this film has good ultrasonic sealing properties. Dry spot bond P, P nonwoven fabric (manufactured by Verdex Co., Ltd.) 20R / m as nonwoven fabric material ² Are prepared in two rolls. The longitudinal elongation at break of this nonwoven fabric was 38%. The elastic member is extended about three times between the roll 14 (about 20 m / min) and the roll 15 (about 60 m / min) by a process as shown in FIG. 17, and the elastic members are sandwiched between the rolls 16 and 17. The upper and lower nonwoven fabrics are supplied as described above. The three-layer sheet was equipped with a rotary ultrasonic welding device (manufactured by Branson), prepared a roll having grit at an interval of 25 m / m on the anvil, passed at a speed of about 62 m / min, and wound in an extended state. Was. When the three-layer partially bonded sheet was cut and relaxed in the state of Tention Free, an elastic composite having folds on both sides having a critical elongation of 185% in the longitudinal direction was obtained. Note that the area ratio {(A + B) / A} × 100 (%) of the bonding portion was about 20%, and the Q / P was about 2.7 times.
[0046]
｝ Coupling between elastic composite and product body 本体
The linear gathers on the outer side of a commercially available disposable diaper (Pampers M size, manufactured by PG) are removed, and the folds are extended between the upper layer top sheet of the side crap portion to be the gather forming portion and the folds of the nonwoven fabric of the elastic composite. Then, they were bonded with a permanent adhesive type hot melt adhesive. The gather formed at the crotch had an elongation of about 180%, and the performance of the elastic composite was hardly impaired. About 30 pieces were made and tested with 5 babies, and interviews with the mother revealed that there were few leaks and the surface was extremely soft.
[0047]
Example 2
｛Elastic composite｝
E. as an elastic member. U. A tubular film having a thickness of 30 μm is formed by an inflation method using a polyolefin elastomer containing A and Butadiene as main components (Laplace, manufactured by Tonen Chemical Co., Ltd.). This elastic member has a breaking elongation of 520%, and has such a property that self-adhesion easily occurs when the films are stacked and pressed.
[0048]
The blown tubular film is wound up and stored in a roll form. On the other hand, an extensible nonwoven fabric is manufactured as follows.
[0049]
That is, a random fiber web (random card manufactured by Herges) is processed from a P, P (polypropylene) Side by side type conjugated fiber (ES composite fiber manufactured by Chisso) 2d × 51 m / m with a high-pressure water flow through an opening belt, Manufacture nonwoven fabric entangled with fibers. After dehydrating under pressure, it was dried and shrunk by passing it through a hot air dryer at 130 ° C. in a 1.6-fold auto-feed state, and a nonwoven fabric with extremely high extensibility was obtained. The breaking elongation of this nonwoven fabric was 190%. Two rolls of this nonwoven fabric are prepared.
[0050]
In the state where the elastic member was used as a core and two layers of extensible nonwoven fabric were sandwiched above and below by the flow sheet shown in FIG. 19, the laminate was heated to 100 ° C. having a process and a surface as shown in FIGS. 20 and 21. 30 m / min. Between the rolls. To obtain a three-layer composite sheet having a horizontal thermal bonding pattern. The heat-bonded portion (A) was 3 m / m, and the unbonded portion (B) was 8 m / m. When the composite sheet was stretched about 2.5 times, the unbonded portion was stretched together with the nonwoven fabric and the elastic member. When the composite sheet in this state is relaxed except for the tension, an elastic composite having an extensibility of about 150% can be obtained. Q / P was about 2.5 times. This elastic composite had two layers of elastic members, which were joined together in a self-adhesive manner, and had a structure in which nonwoven fabric folds were formed on both sides.
[0051]
｝ Coupling of elastic composite to product part｝
A composite sheet of the non-woven fabric and the elastic member before stretching obtained in the above-described process was slit to obtain a tape-shaped rolled sheet. (When wound after stretching, the elastic member causes stress relaxation due to stretching tension and loses elasticity over time. On the other hand, winding the relaxed composite elastic body after stretching without tension makes it extremely bulky. It is not economical.)
The above-mentioned composite sheet is cut into a predetermined length while the composite sheet is stretched 2.4 times in a process as shown in FIG. After bonding the nonwoven fabric surface and the surface material of the diaper with hot melt and then applying a non-tensioned state, an elastic material having excellent elongation and contraction with 140% elongation was obtained.
[0052]
Example 3
｛Elastic composite｝
V. as an elastic member. L. L. D. P. A 30 m film is formed by extruding a polyolefin elastomer elastic sheet (manufactured by Mitsui Toatsu Chemicals) containing E as a main component from a molten die. This film is stretched in the machine direction, and the elongation at break in the machine direction (MD) is around 180%, but the elongation at break in the cross direction (CD) is 420%, so that it is very easy to expand and contract in the cross direction. I had.
[0053]
On the other hand, as a nonwoven fabric, a polypropylene fiber (manufactured by Daiwabo) from 2.2 d × 45 m / m to about 35 g / m ² The parallel web (using a tandem master card manufactured by Hollingsworth Co.) was placed on a cylindrical cylinder having a large number of holes and a dewatering zone, and a high-pressure water flow (50-60 kg / cm). ² ), The fibers are entangled with each other. ² A nonwoven fabric having a soft feel. This nonwoven fabric had a breaking elongation in the longitudinal direction of about 58%, but a breaking elongation in the transverse direction of 220%, and had a structure that was extremely easy to extend in the transverse direction. After cooling the film at about 50 m / min after melt-extruding the elastic member by the process as shown in FIG. 24, first, the nonwoven fabric is guided to a roll, and the nonwoven fabric and the film are press-bonded. This composite sheet was passed through a heating roll on one side in a grit shape as shown in FIG. The grooved roll whose surface was heated to about 110 ° C. was contacted from the nonwoven fabric side. The bonded portion (A) had a width of approximately 2 m / m and the non-bonded portion had a width (B) of approximately 6 m / m. As a result, a composite sheet in which the nonwoven fabric and the elastic film member are partially linearly thermally bonded is obtained. When this is stretched in the lateral direction, it is stretched to about 2.8 times (180%), and when it is relaxed in a state of no tension, an elastic composite having extremely excellent elasticity having nonwoven fabric folds on one side is obtained. Q / P was about 2.8 times.
[0054]
The above-obtained composite sheet was rolled as it was without elongation to produce a roll of 500 m. Since the roll had a nonwoven fabric layer, it could be stably unwound without self-adhesion. This sheet was cut out, and two sheets were overlapped and pressure-bonded at room temperature so that the exposed elastic member surfaces were overlapped, and the films were self-adhered and joined together. When stretched in the lateral direction in this superimposed state, the stretch was about 2.7 times (170%). When this was relaxed in a non-tension state, an elastic composite with excellent elasticity having nonwoven fabric folds on both sides was obtained.
[0055]
｝ Coupling of elastic composite to product part｝
The composite sheet is slit to prepare two sheet rolls having a width of about 180 m / m. When two sheets of 180 m / m are overlapped with each other so as to join the elastic member and pressurized, the two sheets are temporarily bonded by a self-adhesion phenomenon (FIG. 28).
[0056]
Next, when 30 m / m from both ends is heated and pressed on both sides with a surface roll having a smooth surface of 120 ° C., the 30 m / m portions on both sides are completely thermocompressed as shown in FIG. / M, while cutting the composite sheet in the temporarily bonded state into a strip having a width of 50 m / m by the process as shown in FIG. Extended, extended. The change is shown in FIG. By extension, 30 m / m (60 m / m) at both ends were not extended, and the central 120 m / m portion was extended about 300 m / m, that is, 2.5 times. A nonwoven fabric of an elastic composite is bonded to the surface material of the waist-equivalent portion of the disposable diaper that continuously travels in its stretched state, and an adhesive tape as a tying tool is attached to the complete crimp at a side end of 30 m / m. Single Mutsu After cutting and relieving tension, a children's diaper having a waist structure having an elastic body and a tape having extremely good elasticity was manufactured.
[0057]
【The invention's effect】
INDUSTRIAL APPLICABILITY The present invention provides a pants-type sanitary article such as a diaper, in which a novel elastic composite is disposed at a desired portion of the article to obtain smooth elasticity and can be provided at a low cost.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a configuration of a floating gather of the present invention.
FIG. 2 is an explanatory diagram of another configuration of the floating gather of the present invention.
FIG. 3 is an explanatory view of manufacturing a floating gather.
FIG. 4 is an explanatory diagram of a configuration of an elastic composite.
FIG. 5 is an explanatory diagram of a relationship between a joint portion and a fold portion of the elastic composite.
FIG. 6 is an explanatory diagram of a relationship between relaxation and extension of an elastic composite.
FIG. 7 is an explanatory diagram of relaxation and extension of an elastic composite.
FIG. 8 is an explanatory diagram of a modified example of the configuration of the elastic composite.
FIG. 9 is a diagram illustrating an example of a change in the configuration of an elastic composite.
FIG. 10 is an explanatory diagram of a configuration of an elastic composite.
FIG. 11 is an explanatory diagram of another configuration of the elastic composite.
FIG. 12 is an explanatory view of an elastic composite in which a central portion has high elasticity and both ends have low elasticity.
FIG. 13 is an explanatory diagram of a connected state between the elastic composite and the product main body.
FIG. 14 is an explanatory diagram of a state of coupling between the elastic composite and a product main body.
FIG. 15 is an explanatory view of the elasticity of the elastic composite in the vertical and horizontal directions.
FIG. 16 is an explanatory diagram of a manufacturing process of the elastic composite.
FIG. 17 is an explanatory view of an apparatus for manufacturing an elastic composite.
FIG. 18 is an explanatory diagram of a roll in the manufacturing apparatus.
FIG. 19 is an explanatory diagram of another manufacturing method of the elastic composite.
FIG. 20 is an explanatory diagram of another manufacturing apparatus of the elastic composite.
FIG. 21 is an explanatory diagram of a roll in the manufacturing apparatus.
FIG. 22 is an explanatory diagram of another manufacturing method of the elastic composite.
FIG. 23 is an explanatory diagram of another manufacturing method of the elastic composite.
FIG. 24 is an explanatory diagram of another manufacturing apparatus of the elastic composite.
FIG. 25 is an explanatory view of a roll of another manufacturing device of the elastic composite.
FIG. 26 is an explanatory view showing an application example of forming a crotch gather portion during diaper production.
FIG. 27 is an explanatory diagram of a method of expanding when applying a diaper gather unit.
FIG. 28 is an explanatory diagram of temporary joining of an elastic composite.
FIG. 29 is an explanatory diagram of an elastic composite in which both sides have low elastic portions.
FIG. 30 is an explanatory diagram showing a change state of an example in which the center and the both ends have different degrees of expansion and contraction.
FIG. 31 is an explanatory diagram of an example of a conventional diaper.
FIG. 32 is an explanatory view of another example of the conventional diaper.
FIG. 33 is a conceptual diagram of the configuration of the conventional diaper of FIG. 31.
34 is a conceptual diagram of the configuration of the conventional diaper of FIG. 32.
FIG. 35 is an explanatory diagram of a configuration of each part of a conventional diaper.
36 is an explanatory view of a state before and after extension of the conventional diaper of FIG. 31.
FIG. 37 is an explanatory view of the conventional diaper of FIG. 32 before and after stretching.
FIG. 38 is an explanatory diagram of a concept of a floating structure.
[Explanation of symbols]
1 Elastic body
2 Elastic body
3 waist terminal
4 Lumbar terminal
5 Binding part
6 Elastic body
7 Elastic body
11 Non-woven fabric
12 Non-woven fabric
13 Elastic body

Claims (10)

One or both sides of a sheet-like elastic body, by Rukoto to adjust binding the nonwoven substrate only in parallel and continuous multiple binding sites (A) with each other, in the relaxed state of the sheet-like elastic member, each adjacent junction (A) a composite portion having a non-bonded portion (B) forming a fold of a continuous and non-woven base material parallel to each other, and a bonding site (A) between the non-woven base material and the sheet-like elastic body. A / (A + B) × 100% indicating the ratio of the non-binding site to the non-binding site (B) is 50% or less, and the length Q between the bonding portions in the extended state and the length P of the bonding portion in the relaxed state pants ratio Q / P is the elastic composite is 1.5 or more, with the expansion and contraction portion elastic complex you characterized by comprising by bonding the stretchable desired site and the nonwoven fabric base material side of the pants and Sanitary products. According to claim 1, pant-like sanitary products having the elastic composite elastic complex ing is joined to the waist covering end portions of the pants stretchable part. In claim 2, the elastic composite is arranged over the whole of the waist covering end divided into front and rear, and the front and rear waist covering parts are bound by the binding part provided at the side end thereof. pant-like sanitary products having a that is configured elastic composite stretch portion. According to claim 2, pant-like sanitary products having the elastic composite that is bonded so as not to cut part over the entire circumference of the waist covering portion end of the elastic complex pants stretchable part. Stretch in claim 1, when attached to nonwoven substrate on both sides of the sheet-like elastic body, the elastic complex binding point of the nonwoven fabric made of the elastic body and folds ing are combined in substantially the same position on both sides Pant-shaped sanitary products provided in the part. Stretch in claim 3, low in both end for installing the bundling unit height of the folds of the elastic composite having pleats, a back and / or elastic complex higher forms comprising in the central part of the abdomen Pant-shaped sanitary products provided in the part. In claim 4, the height of the folds of the elastic complex, and higher in the central portion of the back and / or abdomen, pant-like sanitary having stretch portion elastic composite ing formed lower in: both sides portions Supplies. According to claim 1, pant-like sanitary products having a Ru polyolefin elastomer der elastic composite elastic material having a self-adhesive stretch portion. The elastic composite according to claim 1, wherein two layers of the elastic composite in which nonwoven fabric folds are formed on one side of the sheet-like elastic body are overlapped on the elastic body surface and joined using self-adhesion to form folds on both sides. pant-like sanitary products having the stretch portion elastic complex was allowed form. According to claim 1, which either vertical or horizontal is superior in more than 100% stretch elongation at break according to the nonwoven fabric base material is hydroentangling, polyolefin elastomers der Ru elastic the elastic body exhibits self-adhesive Pants-like sanitary products with a complex in the elastic part.

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