JP4124322B2 - Absorbent articles - Google Patents

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JP4124322B2
JP4124322B2 JP2002068924A JP2002068924A JP4124322B2 JP 4124322 B2 JP4124322 B2 JP 4124322B2 JP 2002068924 A JP2002068924 A JP 2002068924A JP 2002068924 A JP2002068924 A JP 2002068924A JP 4124322 B2 JP4124322 B2 JP 4124322B2
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幸夫 久米
雅也 藤田
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Daio Paper Corp
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【０００１】
【発明の属する技術分野】
本発明は、経血やおりものなどを吸収するための生理用ナプキン、パンティライナー、失禁パッド等の吸収性物品、詳しくは表面側に略長手方向に沿う方向に縦方向エンボス溝が形成されるとともに、略幅方向に沿う方向に平面視で円弧状の幅方向エンボス溝が形成された吸収性物品に関する。
【０００２】
【従来の技術】
従来より、パンティライナー、生理用ナプキン、失禁パッドなどの吸収性物品として、ポリエチレンシートまたはポリエチレンシートラミネート不織布などの不透液性裏面シートと、不織布または透液性プラスチックシートなどの透液性表面シートとの間に綿状パルプ等からなる吸収体を介在したものが知られている。
【０００３】
この種の吸収性物品にも幾多の改良が重ねられ、体液漏れ等を防止するための手段が種々講じられている。例えば、幅方向への体液の拡散を防止するとともに、吸収体のヨレを防止し、かつ吸収体中央部を隆起させ局部への密着性を向上させるなどの目的で、表面側に熱エンボスによってエンボス溝を形成する技術が存在する。
【０００４】
たとえば、本出願人による先の特願2000-314592号においては、図６に示されるように、生理用ナプキンＮの透液性表面シート面側に略長手方向に沿う方向に長手方向中心線Ｓを跨いで左右一対の縦方向エンボス溝５０，５０が形成されるとともに、略幅方向に沿う方向に平面視で円弧状の幅方向エンボス溝５１，５１が形成され、これら縦方向エンボス溝５０及び幅方向エンボス溝５１の底面に、図７に示されるように、溝長手方向に沿って高圧搾部５３と低圧搾部５４とが交互に配置されたものが示されている。
【０００５】
前記エンボス溝５０，５１は、生理用ナプキンＮの製造過程において、吸収体と表面シートとを積層させた状態で、所定温度に加熱された圧搾ロールと、圧力を受け止めるアンビルロールとの間を通過させることによって、前記透液性表面シート側から前記圧搾ロールの表面に形成されたエンボス溝用突部による圧搾によって形成される。この場合、前記圧搾ロールの表面には、前記縦方向エンボス溝用突部と幅方向エンボス溝用突部とが形成され、前記圧搾ロールに一定の押圧力が加えられた状態で、圧搾ロールが回転しながら、その母線部分が順次生理用ナプキンＮと接触し、ナプキンＮの長さ方向にエンボス溝が形成される。
【０００６】
【発明が解決しようとする課題】
前述のように、従来のエンボス加工においては、ナプキンの略長手方向に沿う縦方向エンボス溝と、ナプキンの略幅方向に沿う幅方向エンボス溝とが混在しているにも拘わらず、圧搾ロールに一定の押圧力を作用させているため、エンボス溝のある部分では圧力が高くなり、またある部分では圧力が小さくなる。その結果、表面シートの一部に破れまたは浮きが生じてしまうなどの問題があった。
【０００７】
具体的に詳述すると、仮に、ナプキンの幅方向にエンボス溝を横断する１本の線を引いた場合に、その横断線は“高圧搾部と接触する部分”と“低圧搾部と接触する部分”とに分かれるが、その内、前記“高圧搾部と接触する部分”のみの長さを前記１本の横断線上において合計した長さを「接触線長さ」と定義した場合、ナプキン表面に形成された縦方向エンボス溝部分と幅方向エンボス溝部分とでは、幅方向エンボス溝部分における接触線長さが極端に長くなる。しかし、前記圧搾ロールに作用させる押圧力は一定であるから、前記接触線長さの長い幅方向エンボス溝部分では線圧（圧力）が小さくなり、接触線長さの短い縦方向エンボス溝部分では線圧が大きくなる。したがって、前記縦方向エンボス溝側に適した圧力になるように圧搾ロールの押圧力を設定すると、幅方向エンボス溝部では線圧が足らず、表面シートに浮きが生じることになる。逆に、幅方向エンボス側に適した圧力になるように圧搾ロールの押圧力を設定すると、縦方向エンボス溝部では線圧が大きく成り過ぎて表面シートに破れが生じることになる。
【０００８】
本発明者等が行った試験に基づいて更に詳述すると、図８(A)は、試験に供したナプキンの縦方向エンボス溝５０及び幅方向エンボス溝５１の形成パターン図であり、図８(B)はそのエンボスパターンに対応する接触線長さの測定結果グラフである。
【０００９】
図８(B)に示されるように、縦方向エンボス溝５０の接触線長さの最大値は１．８mm前後で安定して推移しているが、幅方向エンボス溝５１の接触線長さの最大値は９．４mmまで達し、エンボス溝加工の始めと終わりの幅方向エンボス領域Ｈ部分で接触線長さが極端に長くなっていることが分かる。圧搾ロールの押圧力をＷ＝1,178kgfと設定し、前記エンボスパターンの接触線長さが最大となる位置での線圧を求めたところ、縦方向エンボス溝５０部分では654kgf/mmとなるのに対し、幅方向エンボス溝５１部分では125kgf/mmとなり、約500kgf/mmの差が生じてしまうことになる。実際に、エンボス加工を行った後、エンボス溝部の表面状態を目視観察すると、縦方向エンボス溝５０部分では表面シートの破れ、浮き共に無く綺麗に加工されているのに対し、幅方向エンボス溝５１部分では線圧が足らないため、表面シートの一部に浮きが生じ、高圧搾部５３の跡が確認できず、非常に見栄えの悪いものであった。
【００１０】
そこで本発明の主たる課題は、透液性表面シート面側に略長手方向に沿う方向に長手方向中心線を跨いで左右一対の縦方向エンボス溝が形成されるとともに、略幅方向に沿う方向に平面視で円弧状の幅方向エンボス溝が形成され、これら縦方向エンボス溝及び幅方向エンボス溝の底面に溝長手方向に沿って高圧搾部と低圧搾部とが交互に配置された吸収性物品において、前記表面シートの浮きまたは破れを防止しながら、前記縦方向エンボス溝および幅方向エンボス溝を形成できるようにすることにある。
【００１１】
【課題を解決するための手段】
前記課題を解決するために請求項１に係る本発明として、透液性表面シートと、不透液性裏面シートとの間に吸収体が介在され、前記透液性表面シート面側に略長手方向に沿う縦方向エンボス溝が形成されるとともに、略幅方向に沿う幅方向エンボス溝が形成され、これら縦方向エンボス溝及び幅方向エンボス溝の底面に溝長手方向に沿って高圧搾部と低圧搾部とが交互に配置された吸収性物品において、
吸収性物品の幅方向に、前記エンボス溝を横断する１本の線を引いた場合に、この横断線が前記高圧搾部と接触する部分の長さを横断線上において合計した長さをもって「接触線長さ」と定義し、
前記幅方向エンボス溝において、前記接触線長さを、高圧搾部の間隔、高圧搾部の幅および曲率の内のいずれか又は組み合わせによって調整することにより、前記幅方向エンボス溝が存在する領域の接触線長さの最大値と、前記縦方向エンボス溝が存在する領域の接触線長さの最大値との差が５mm以下となるようにしたことを特徴とする吸収性物品が提供される。
【００１２】
また、請求項２に係る本発明として、透液性表面シートと、不透液性裏面シートとの間に吸収体が介在され、前記透液性表面シート面側に略長手方向に沿う方向に長手方向中心線を跨いで左右一対の縦方向エンボス溝が形成されるとともに、略幅方向に沿う方向に平面視で円弧状の幅方向エンボス溝が形成され、これら縦方向エンボス溝及び幅方向エンボス溝の底面に溝長手方向に沿って高圧搾部と低圧搾部とが交互に配置された吸収性物品において、
吸収性物品の幅方向に、前記エンボス溝を横断する１本の線を引いた場合に、この横断線が前記高圧搾部と接触する部分の長さを横断線上において合計した長さをもって「接触線長さ」と定義し、
前記幅方向エンボス溝において、前記接触線長さを、高圧搾部の間隔、高圧搾部の幅および曲率の内のいずれか又は組み合わせによって調整することにより、前記幅方向エンボス溝が存在する領域の接触線長さの最大値と、前記縦方向エンボス溝が存在する領域の接触線長さの最大値との差が５mm以下となるようにしたことを特徴とする吸収性物品が提供される。
【００１３】
上記請求項１、２記載の発明においては、幅方向エンボス溝が存在する領域の接触線長さの最大値と、前記縦方向エンボス溝が存在する領域の接触線長さの最大値との差が５mm以下となるように調整してある。従って、圧搾ロールの押圧力を一定としてエンボス加工を行った場合でも、縦方向エンボス溝部分と幅方向エンボス溝部分とにおける極端な圧力（線圧）の違いを緩和することができ、表面シートの浮きや破れを防止しながら、縦方向エンボス溝および幅方向エンボス溝を形成できるようになる。なお、図８(A)のエンボスパターン例のように、幅方向エンボス溝が存在する領域と縦方向エンボス溝が存在する領域とが長手方向に一部重なり合う場合、前記縦方向エンボス溝が存在する領域の接触線長さの最大値は、前記重なり部分を除き、縦方向エンボス溝のみが存在する領域の接触線長さの最大値とする。また、前記縦方向エンボス溝と幅方向エンボス溝とが連続し、全体として長円形、瓢箪形等を成している場合には、便宜的に縦方向エンボス領域と幅方向エンボス領域とに区切り、それぞれの領域の接触線長さの最大値を求めるようにする。
【００１４】
具体的態様に係る請求項３の発明として、前記幅方向エンボス溝の高圧搾部は、縦方向中心線から外方に向かうに従って、高圧搾部の間隔を狭くしてある請求項１〜２いずれかに記載の吸収性物品が提供される。
【００１５】
具体的態様に係る請求項４の発明として、前記幅方向エンボス溝の高圧搾部は、縦方向中心線から外方に向かうに従って、高圧搾部の幅を大きくしてある請求項１〜２いずれかに記載の吸収性物品が提供される。
【００１６】
請求項５に係る本発明として、前記幅方向エンボス溝が存在する領域の接触線長さの最大値が４．５〜１０mmである請求項１〜４いずれかに記載の吸収性物品が提供される。
【００１７】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照しながら詳述する。
図１は本発明に係る生理用ナプキン１の斜視図、図２は図１のＡ部拡大平面図、図３は図２のIII−III線矢視図である。
【００１８】
生理用ナプキン１は、不透液性裏面シート２と、透液性表面シート３（以下、単に表面シートいう。）との間に、クレープ紙によって囲繞された吸収体４が介在された構造となっている。前記吸収体４の周囲においては、前記不透液性裏面シート２と透液性表面シート３とがホットメルト接着剤等の接着手段によって接合されている。
【００１９】
前記表面シート３としては、有孔または無孔の不織布や多孔性プラスチックシートなどが好適に用いられる。不織布を構成する素材繊維としては、例えばポリエチレンまたはポリプロピレン等のオレフィン系、ポリエステル系、ポリアミド系等の合成繊維の他、レーヨンやキュプラ等の再生繊維、綿等の天然繊維とすることができる。
【００２０】
前記生理用ナプキン１の表面シート面側に、該表面シート３と吸収体４とを一体化しズレを防止するとともに、吸収体４の排血部位を隆起させて局部との密着性を向上させる。更には経血の横／縦漏れを防止するなどの目的で、略長手方向に沿う方向に長手方向中心線Ｓを跨いで左右一対の縦方向エンボス溝５，５と、ナプキン前後部にそれぞれ略幅方向に沿って幅方向エンボス溝６，６とが形成されている。前記縦方向エンボス溝５，５は平面視で長手方向中心線Ｓ側に向けて膨出する円弧状に形成され、前記幅方向エンボス溝６，６は平面視で外側に向けて膨出する円弧形状に形成されている。
【００２１】
前記エンボス溝５、６は共に、図２に示されるように、相対的に強く圧搾され厚みの薄い高圧搾部１２と、相対的に弱く圧搾され厚みの厚い低圧搾部１４とが溝の長手方向に交互に配置された構造となっている。前記エンボス溝５、６の断面形状は、エンボス溝５、６の付与前における仮想ナプキン形状線Ｋを基準として、前記エンボス溝５、６部位のナプキン厚をＡとした場合、前記高圧搾部１２部位の厚みＣ＝０．０３〜０．６×Ａ、好ましくは０．０５〜０．３×Ａとし、前記低圧搾部１４部位の厚みＢ＝０．０５〜０．７×Ａ、好ましくは０．０７〜０．４×Ａとし、かつ低圧搾部１４部位の厚みＢ＞高圧搾部１２部位の厚みＣとする。また、前記低圧搾部１４と高圧搾部１２との差（Ｂ−Ｃ）は、０．０２〜２mm、好ましくは０．１〜１．０mmとするのが望ましい。なお、図示されるナプキン例では、吸収体４は局部への密着性を良好とするため、吸収体中央部を積繊量の増大、吸収体の積層などによって周囲よりも中高に形成してある。また、前記エンボス溝５、６の底面幅Ｌは、１〜８mm、好ましくは２〜６mmとするのが望ましく、前記高圧搾部１２の幅は０．５〜６mm、好ましくは１〜４mmとするのが望ましい。
【００２２】
前記エンボス溝５、６は、図４に示されるように、生理用ナプキン１の製造過程において、吸収体４と表面シート３とを積層させた状態で圧搾溝成形装置２０を通過させることにより成形される。
【００２３】
前記圧搾溝成形装置２０は、エンボス溝形成突部２２、２２…を周面に有する圧搾ロール２１と、圧力を受け止めるアンビルロール２３とからなる装置で、前記生理用ナプキン１を前記圧搾ロール２１とアンビルロール２３との狭空間を通過させることにより、前記溝形成用突部２２が表面シート３側から該表面シート３と共に吸収体４を圧搾しエンボス溝５、６が形成される。前記圧搾ロール２１の温度は、表面シート３の融点および圧搾時間を考慮すると、５０〜２００℃の範囲とするのが望ましい。この場合、前記表面シート３と吸収体４との間にホットメルト接着剤を介在させるようにし、加熱下で圧搾した際、前記ホットメルト接着剤の接着力により圧搾形状を安定させたり、吸収体４内に熱融着性繊維を混入しておき、加熱下で圧搾した際、熱によって前記熱融着性繊維の接着を促し、圧搾形状を安定化させたりすることができる。
【００２４】
かかるエンボス加工時において、縦方向エンボス領域Ｖと、幅方向エンボス領域Ｈとにおいて、前述した「接触線長さ」が極端に異なることによって表面シート３に浮きや破れが生じないようにするため、本発明では前記幅方向エンボス溝６，６が存在する領域Ｈの接触線長さの最大値ＳＨmaxと、前記縦方向エンボス溝５，５が存在する領域Ｖの接触線長さの接触線長さの最大値ＳＶmaxとの差が５mm以下、好ましくは４mm以下、より好ましくは３mm以下となるように、主に前記幅方向エンボス溝６，６側において高圧搾部１２の付与パターンを調整する。具体的には、高圧搾部１２の間隔、高圧搾部１２の幅および曲率の内のいずれか又は組み合わせによって前記接触線長さを調整するようにする。前記縦方向エンボス領域Ｖと幅方向エンボス領域Ｈとの接触線長さの最大値の差を５mm以内にすることにより、溝幅等にもよるが、縦方向エンボス溝５と幅方向エンボス幅６との圧力の変動幅を概ね５０％以内、好ましくは４５％以内に抑えることができ、表面シート３の浮きや破れなどを防止できるようになる。この場合、前記幅方向エンボス溝６が存在する領域Ｈの接触線長さの最大値は４．５〜１０mmとするのが望ましい。縦方向エンボス領域Ｖにおける接触線長さは縦方向エンボス溝５の溝幅等の制限から大きくすることが難しいため、幅方向エンボス領域Ｈにおける接触線長さが１０mmを超える場合には、前記縦方向エンボス溝領域Ｖと幅方向エンボス溝領域Ｈとの接触線長さの最大値の差を５mm以内にすることが困難となる。
【００２５】
具体的に図２に示される例では、幅方向エンボス溝６の高圧搾部１２、１２…は、縦方向中心線Ｓから外方に向かうに従って、高圧搾部１２の間隔Ｐ１〜Ｐ５を順次狭くすることにより、幅方向エンボス領域Ｈにおける接触線長さの最大値ＳＨmaxと、前記縦方向エンボス領域Ｖにおける接触線長さの最大値ＳＶmaxとの差が５mm以下となるように調整している。
【００２６】
上記幅方向エンボス領域Ｈにおける接触線長さと、前記縦方向エンボス領域Ｖにおける接触線長さとの差を調整する他の方法としては、例えば図５(A)に示されるように、縦方向中心線Ｓから外方に向かうに従って、高圧搾部１２の幅を大きくすることにより、換言すれば幅方向エンボス６の接線が幅方向となる領域、すなわち接触線長さが最大となる領域の高圧搾部幅を小さくすることにより接触線長さを調整する方法や、図５(B)(C)に示されるように、幅方向エンボス領域Ｈにおける接触線長さの最大値ＳＨmaxと、前記縦方向エンボス領域Ｖにおける接触線長さの最大値ＳＶmaxとの差が５mm以下となるように高圧搾幅１２の間隔を決定する方法や、図５(D)に示されるように、幅方向エンボス６の円弧の曲率半径を小さくすることにより、幅方向エンボス６の接線が幅方向となる近傍領域において接触線長さが小さくなるように調整する方法などを挙げることができる。
【００２７】
ところで、上記例では高圧搾部１２はすべてナプキン長手方向に沿って形成するようにしたが、溝長手方向線に対して垂線方向に形成してもよいし、傾斜方向に形成してもよい。
【００２８】
【実施例】
３５g/m2のポリエチレン／エチレン酢酸ビニル共重合体フィルムを表面シートとし、３５g/m2のポリエチレンフィルムを裏面シートとし、クレープ紙で囲繞したパルプ300g/m2の吸収体とにより生理用ナプキンを作成し、この生理用ナプキンの表面側に、圧搾ロールによる圧搾（押圧力＝1、178kgf)により、接触線長さの最大値ＳＶmaxが３．３mmの縦方向エンボス溝５，５を形成するとともに、高圧搾部１２のパターンを変えた幅方向エンボス溝６，６を形成し、幅方向エンボス領域Ｈの接触線長さの最大値ＳＨmax、前記縦方向エンボス領域Ｖと幅方向エンボス領域Ｈとの接触線長さの差を求めるとともに、表面シートの破れや浮きを目視確認した。
【００２９】
【表１】

Figure 0004124322
【００３０】
表１より、縦方向エンボス領域Ｖと幅方向エンボス領域Ｈとの接触線長さの差を５mm以内とした実施例１〜５については、表面材の破れや浮きが無く、エンボス加工が良好に行えていることが分かる。
【００３１】
【発明の効果】
以上詳説のとおり本発明によれば、透液性表面シート面側に略長手方向に沿う方向に長手方向中心線を跨いで左右一対の縦方向エンボス溝が形成されるとともに、略幅方向に沿う方向に平面視で円弧状の幅方向エンボス溝が形成され、これら縦方向エンボス溝及び幅方向エンボス溝の底面に溝長手方向に沿って高圧搾部と低圧搾部とが交互に配置された吸収性物品において、前記表面シートの浮きまたは破れを防止しながら、前記縦方向エンボス溝および幅方向エンボス溝を形成することができるようになる。
【図面の簡単な説明】
【図１】 本発明に係る生理用ナプキン１の斜視図である。
【図２】 図１のＡ部拡大平面図である。
【図３】 図２のIII−III線矢視図である。
【図４】 エンボス溝５，６の形成要領図である。
【図５】 (A)〜(D)は幅方向エンボス溝６の他の形成態様図である。
【図６】 従来のエンボス溝５０，５１を形成した生理用ナプキンＮの平面図である。
【図７】 エンボス溝５０（５１）の拡大斜視図である。
【図８】 (A)は、試験に供したナプキンの縦方向エンボス溝５０及び幅方向エンボス溝５１の形成パターン図であり、(B)はそのエンボスパターンに対応する接触線長さの測定結果グラフである。
【符号の説明】
１…生理用ナプキン、２…不透液性裏面シート、３…透液性表面シート、４…吸収体、５…縦方向エンボス溝、６…幅方向エンボス溝、１２…高圧搾部、１４…低圧搾部[0001]
BACKGROUND OF THE INVENTION
The present invention has absorbent articles such as sanitary napkins, panty liners and incontinence pads for absorbing menstrual blood and vaginal discharge, and more specifically, longitudinal embossed grooves are formed on the surface side in a direction substantially along the longitudinal direction. In addition, the present invention relates to an absorbent article having arcuate widthwise embossed grooves formed in a plan view in a direction substantially along the widthwise direction.
[0002]
[Prior art]
Conventionally, as an absorbent article such as a panty liner, sanitary napkin, incontinence pad, a liquid-impervious back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric, and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet There is known an intervening absorber made of cotton-like pulp or the like.
[0003]
Many improvements have been made on this type of absorbent article, and various means for preventing body fluid leakage and the like have been taken. For example, to prevent diffusion of bodily fluids in the width direction, to prevent twisting of the absorbent body, and to raise the central portion of the absorbent body to improve adhesion to the local area, the surface is embossed by hot embossing. There are techniques for forming grooves.
[0004]
For example, in the previous Japanese Patent Application No. 2000-314592 filed by the present applicant, as shown in FIG. 6, the longitudinal center line S extends in the direction substantially along the longitudinal direction on the liquid-permeable surface sheet surface side of the sanitary napkin N. A pair of left and right vertical embossed grooves 50, 50 are formed across the two, and arcuate widthwise embossed grooves 51, 51 are formed in a plan view in a direction substantially along the width direction. In the bottom surface of the width direction embossed groove 51, as shown in FIG. 7, the high pressing parts 53 and the low pressing parts 54 are alternately arranged along the longitudinal direction of the groove.
[0005]
In the manufacturing process of the sanitary napkin N, the embossed grooves 50 and 51 pass between an squeeze roll heated to a predetermined temperature and an anvil roll receiving the pressure in a state where the absorbent body and the surface sheet are laminated. By making it, it forms by pressing by the protrusion for embossing grooves formed in the surface of the said pressing roll from the said liquid-permeable surface sheet side. In this case, on the surface of the pressing roll, the vertical embossing groove protrusion and the widthwise embossing groove protrusion are formed, and the pressing roll is in a state where a constant pressing force is applied to the pressing roll. While rotating, the busbar portion sequentially contacts the sanitary napkin N, and an embossed groove is formed in the length direction of the napkin N.
[0006]
[Problems to be solved by the invention]
As described above, in the conventional embossing, although the vertical embossed groove along the substantially longitudinal direction of the napkin and the widthwise embossed groove along the substantially widthwise direction of the napkin are mixed, Since a constant pressing force is applied, the pressure increases in a portion where the embossed groove is present, and the pressure decreases in a certain portion. As a result, there was a problem that a part of the surface sheet was torn or floated.
[0007]
Specifically, if a single line that crosses the embossed groove is drawn in the width direction of the napkin , the crossing line is in contact with the "high pressure portion" and "the low pressure portion. When the total length of only the “parts in contact with the pressed parts” on the one transverse line is defined as “contact line length”, the surface of the napkin is divided into “parts”. The contact line length in the width direction embossing groove part becomes extremely long in the vertical direction embossing groove part and the width direction embossing groove part formed in 1). However, since the pressing force applied to the squeezing roll is constant, the linear pressure (pressure) is reduced in the width direction embossed groove portion having a long contact line length, and in the longitudinal direction embossing groove portion having a short contact line length. The linear pressure increases. Accordingly, when the pressing force of the squeezing roll is set so as to be a pressure suitable for the longitudinal embossed groove, the line pressure is insufficient in the widthwise embossed groove, and the top sheet is floated. On the contrary, if the pressing force of the squeezing roll is set so as to be a pressure suitable for the width direction embossing side, the linear pressure becomes too large in the longitudinal direction embossing groove, and the topsheet is torn.
[0008]
8A is a formation pattern diagram of the vertical embossed groove 50 and the widthwise embossed groove 51 of the napkin subjected to the test, and FIG. B) is a measurement result graph of the contact line length corresponding to the embossed pattern.
[0009]
As shown in FIG. 8B, the maximum value of the contact line length of the longitudinal embossed groove 50 is stable at around 1.8 mm. The maximum value reaches 9.4 mm, and it can be seen that the contact line length is extremely long in the embossed region H in the width direction at the beginning and end of emboss groove processing. The pressing force of the squeeze roll was set to W = 1,178 kgf, and the line pressure at the position where the contact line length of the embossed pattern was the maximum was obtained, but it was 654 kgf / mm in the vertical embossed groove 50 part. On the other hand, the width direction embossed groove 51 is 125 kgf / mm, resulting in a difference of about 500 kgf / mm. Actually, after the embossing is performed, the surface state of the embossed groove is visually observed. In the vertical embossed groove 50 portion, the surface sheet is not broken or floated, and the embossed groove 51 is cleanly processed. Since the line pressure was insufficient at the portion, a part of the surface sheet was lifted, and the trace of the high-pressure squeezed portion 53 could not be confirmed, which was very poor in appearance.
[0010]
Therefore, the main problem of the present invention is that a pair of left and right vertical embossed grooves are formed across the longitudinal center line in the direction along the longitudinal direction on the liquid-permeable surface sheet surface side, and in the direction along the substantially width direction. Absorbent article in which arc-shaped widthwise embossed grooves are formed in plan view, and high pressure parts and low pressure parts are alternately arranged along the longitudinal direction of the grooves on the bottom surfaces of the vertical and widthwise embossed grooves. In the above, the longitudinal embossed groove and the widthwise embossed groove can be formed while preventing the topsheet from being lifted or torn.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable surface sheet and the liquid-impermeable back sheet, and the liquid-permeable surface sheet surface side is substantially longitudinal. A longitudinal embossed groove is formed along the direction, and a widthwise embossed groove is formed substantially along the width direction. In the absorbent article in which the compressed parts are alternately arranged,
In the width direction of the absorbent article, when minus one line traversing the embossing groove, the transverse lines with the total length of the transverse line the length of the portion in contact with the high compression portion "contact Line length ",
In the width direction embossed groove, the contact line length is adjusted by any one or combination of the interval between the high-pressure parts, the width and the curvature of the high-pressure parts, so that the width direction emboss groove exists. the maximum value of the contact line length, the absorbent article which the difference between the maximum value of the contact wire length of the region where the the longitudinal embossed groove is present, characterized in that set to be 5mm or less is provided.
[0012]
Moreover, as this invention which concerns on Claim 2, an absorber is interposed between a liquid-permeable surface sheet and a liquid-impermeable back sheet, and the liquid-permeable surface sheet surface side is a direction along a substantially longitudinal direction. A pair of left and right longitudinal embossed grooves are formed across the longitudinal center line, and arcuate widthwise embossed grooves are formed in a plan view in a direction substantially along the width direction. These longitudinally embossed grooves and widthwise embossed grooves are formed. In the absorbent article in which the high pressing parts and the low pressing parts are alternately arranged along the groove longitudinal direction on the bottom surface of the groove,
In the width direction of the absorbent article, when minus one line traversing the embossing groove, the transverse lines with the total length of the transverse line the length of the portion in contact with the high compression portion "contact Line length ",
In the width direction embossed groove, the contact line length is adjusted by any one or combination of the interval between the high-pressure parts, the width and the curvature of the high-pressure parts, so that the width direction emboss groove exists. the maximum value of the contact line length, the absorbent article which the difference between the maximum value of the contact wire length of the region where the the longitudinal embossed groove is present, characterized in that set to be 5mm or less is provided.
[0013]
In the first and second aspects of the invention, the difference between the maximum value of the contact line length in the region where the widthwise embossed groove exists and the maximum value of the contact line length in the region where the vertical direction embossed groove exists. Is adjusted to 5 mm or less. Therefore, even when embossing is performed with the pressing force of the pressing roll being constant, the difference in extreme pressure (linear pressure) between the longitudinal embossed groove portion and the widthwise embossed groove portion can be alleviated, It is possible to form the vertical embossed grooves and the widthwise embossed grooves while preventing floating and tearing. In addition, as in the example of the emboss pattern in FIG. 8A, when the region where the width direction embossed groove exists and the region where the lengthwise embossed groove partially overlap in the longitudinal direction, the lengthwise embossed groove exists. The maximum value of the contact line length of the region is the maximum value of the contact line length of the region where only the vertical embossed groove exists except for the overlapping portion. In addition, when the vertical embossed groove and the widthwise embossed groove are continuous and form an oval shape, a bowl shape, or the like as a whole, the vertical direction embossed region and the widthwise embossed region are separated for convenience. The maximum value of the contact line length in each area is obtained.
[0014]
As invention of Claim 3 which concerns on a specific aspect, as for the high pressing part of the said width direction embossing groove | channel, the space | interval of a high pressing part is narrowed as it goes to the outward from the vertical direction centerline, Any of Claims 1-2 An absorbent article as described above is provided.
[0015]
As the invention of claim 4 according to a particular embodiment, the high compression portion of the width direction embossed grooves toward the outer side from the longitudinal center line, one of claims 1-2 that is by increasing the width of the high compression portion An absorbent article as described above is provided.
[0016]
As the present invention according to claim 5, the absorbent article according to claim 1-4 maximum value of the contact wire length of the region where the width direction embossed groove is located is a 4.5~10mm is provided The
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a sanitary napkin 1 according to the present invention, FIG. 2 is an enlarged plan view of a portion A in FIG. 1, and FIG. 3 is a view taken along line III-III in FIG.
[0018]
The sanitary napkin 1 has a structure in which an absorbent 4 surrounded by crepe paper is interposed between a liquid-impermeable back sheet 2 and a liquid-permeable surface sheet 3 (hereinafter simply referred to as a surface sheet). It has become. Around the absorber 4, the liquid-impervious back sheet 2 and the liquid-permeable top sheet 3 are bonded together by an adhesive means such as a hot melt adhesive.
[0019]
As the surface sheet 3, a perforated or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the raw material fibers constituting the nonwoven fabric include synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton.
[0020]
The topsheet 3 and the absorbent body 4 are integrated with the topsheet side of the sanitary napkin 1 to prevent displacement, and the blood drainage site of the absorbent body 4 is raised to improve the adhesion to the local area. Furthermore, for the purpose of preventing lateral / longitudinal leakage of menstrual blood, a pair of left and right longitudinal embossed grooves 5 and 5 straddling the longitudinal center line S in a direction substantially along the longitudinal direction, and the front and rear portions of the napkin, respectively. Embossed grooves 6 and 6 in the width direction are formed along the width direction. The vertical embossed grooves 5 and 5 are formed in an arc shape that bulges toward the longitudinal center line S in plan view, and the widthwise embossed grooves 6 and 6 are arcs that bulge outward in plan view. It is formed into a shape.
[0021]
As shown in FIG. 2, the embossed grooves 5 and 6 both have a high-pressure squeezed portion 12 that is relatively strongly squeezed and thin, and a low-pressure squeezed portion 14 that is relatively weakly squeezed and has a large thickness. The structure is arranged alternately in the direction. The cross-sectional shape of the embossed grooves 5 and 6 is based on the virtual napkin shape line K before the embossed grooves 5 and 6 are provided, and when the napkin thickness of the embossed grooves 5 and 6 is A, the high pressing portion 12 The thickness C of the part is 0.03 to 0.6 × A, preferably 0.05 to 0.3 × A, and the thickness B of the low pressing part 14 is 0.05 to 0.7 × A, preferably The thickness is 0.07 to 0.4 × A, and the thickness B of the 14 parts of the low pressing part is greater than the thickness C of the 12 part of the high pressing part. Further, the difference (B-C) between the low pressing portion 14 and the high pressing portion 12 is 0.02 to 2 mm, preferably 0.1 to 1.0 mm. In the illustrated napkin example, the absorbent body 4 has good adhesion to the local area, so that the central part of the absorbent body is formed to be higher than the surroundings by increasing the amount of fiber piled up or by laminating the absorbent bodies. . The bottom width L of the embossed grooves 5 and 6 is 1 to 8 mm, preferably 2 to 6 mm, and the width of the high pressing portion 12 is 0.5 to 6 mm, preferably 1 to 4 mm. Is desirable.
[0022]
As shown in FIG. 4, the embossed grooves 5 and 6 are formed by passing the compressed groove forming device 20 in a state where the absorbent body 4 and the top sheet 3 are laminated in the manufacturing process of the sanitary napkin 1. Is done.
[0023]
The squeezing groove forming device 20 is a device comprising a squeezing roll 21 having embossed groove forming protrusions 22, 22... On the peripheral surface and an anvil roll 23 for receiving pressure, and the sanitary napkin 1 is squeezed with the squeezing roll 21. By passing through the narrow space with the anvil roll 23, the groove-forming protrusion 22 squeezes the absorbent body 4 together with the surface sheet 3 from the surface sheet 3 side, and embossed grooves 5 and 6 are formed. The temperature of the pressing roll 21 is preferably in the range of 50 to 200 ° C. in consideration of the melting point of the top sheet 3 and the pressing time. In this case, when the hot melt adhesive is interposed between the top sheet 3 and the absorbent body 4 and squeezed under heating, the compressed shape is stabilized by the adhesive force of the hot melt adhesive, or the absorbent body. When the heat-fusible fiber is mixed in 4 and squeezed under heating, adhesion of the heat-fusible fiber is promoted by heat, and the squeezed shape can be stabilized.
[0024]
At the time of such embossing, in order to prevent the surface sheet 3 from being lifted or torn by the extremely different “contact line length” described above in the vertical direction embossed region V and the width direction embossed region H, In the present invention, the maximum value SH max of the contact line length of the region H where the widthwise embossed grooves 6 and 6 are present, and the contact line of the contact line length of the region V where the longitudinally embossed grooves 5 and 5 are present. The application pattern of the high pressing portion 12 is mainly formed on the side of the embossed grooves 6 and 6 in the width direction so that the difference from the maximum value S V max is 5 mm or less, preferably 4 mm or less, more preferably 3 mm or less. adjust. Specifically, the contact line length is adjusted by any one or combination of the interval between the high pressing parts 12, the width and the curvature of the high pressing part 12. By making the difference in the maximum contact line length between the vertical embossed region V and the widthwise embossed region H within 5 mm, the vertical embossed groove 5 and the widthwise embossed width 6 depend on the groove width and the like. The fluctuation range of the pressure can be suppressed to approximately 50% or less, preferably 45% or less, and the surface sheet 3 can be prevented from being lifted or torn. In this case, it is desirable that the maximum value of the contact line length of the region H where the width direction embossed groove 6 exists is 4.5 to 10 mm. Since it is difficult to increase the contact line length in the vertical embossed region V due to limitations such as the groove width of the vertical embossed groove 5, when the contact line length in the widthwise embossed region H exceeds 10 mm, It becomes difficult to make the difference in maximum contact line length between the direction embossed groove region V and the width direction embossed groove region H within 5 mm.
[0025]
Specifically, in the example shown in FIG. 2, the high-pressure parts 12, 12... Of the widthwise embossed grooves 6 increase the intervals P 1 to P 5 of the high-pressure parts 12 as they go outward from the longitudinal center line S. By sequentially narrowing, the difference between the maximum value S H max of the contact line length in the width direction embossed region H and the maximum value S V max of the contact line length in the vertical direction embossed region V is 5 mm or less. It is adjusted to.
[0026]
As another method for adjusting the difference between the contact line length in the width direction embossed region H and the contact line length in the vertical direction embossed region V, for example, as shown in FIG. In other words, by increasing the width of the high pressure portion 12 from S toward the outside, in other words, the high pressure portion of the region where the tangent of the width direction emboss 6 is in the width direction, that is, the region where the contact line length is maximum. The method of adjusting the contact line length by reducing the width, or the maximum value SH max of the contact line length in the width direction embossed region H as shown in FIGS. A method of determining the spacing of the high pressing width 12 so that the difference from the maximum value S V max of the contact line length in the direction embossed region V is 5 mm or less, or as shown in FIG. By reducing the radius of curvature of the arc of the emboss 6, the width A method of adjusting so that the contact line length in the region near where a tangent of the direction embossing 6 becomes the width direction becomes small and the like.
[0027]
By the way, although all the high pressing parts 12 were formed along the napkin longitudinal direction in the said example, you may form in a perpendicular direction with respect to a groove | channel longitudinal direction line, and may form in an inclination direction.
[0028]
【Example】
A sanitary napkin is obtained by using a 35 g / m 2 polyethylene / ethylene vinyl acetate copolymer film as a top sheet, a 35 g / m 2 polyethylene film as a back sheet, and an absorbent of 300 g / m 2 of pulp surrounded by crepe paper. The vertical embossed grooves 5 and 5 having a maximum contact line length S V max of 3.3 mm are formed on the surface side of the sanitary napkin by pressing with a pressing roll (pressing force = 1, 178 kgf). In addition, the embossed grooves 6 and 6 in the width direction are formed by changing the pattern of the high-pressed portion 12, and the maximum value SH max of the contact line length in the embossed region H in the width direction, the embossed region V in the width direction and the embossed in the width direction. with obtaining the difference between the contact line length between the region H, the tear and floating of the topsheet it was confirmed visually.
[0029]
[Table 1]
Figure 0004124322
[0030]
From Table 1, in Examples 1 to 5 in which the difference in contact line length between the vertical embossed region V and the widthwise embossed region H was within 5 mm, the surface material was not broken or floated, and the embossing was good You can see that it is done.
[0031]
【The invention's effect】
As described above in detail, according to the present invention, a pair of left and right vertical embossed grooves are formed across the longitudinal center line in the direction along the longitudinal direction on the liquid-permeable surface sheet surface side, and substantially along the width direction. Absorption in which arc-shaped widthwise embossed grooves are formed in a plan view in the direction, and high pressure squeezed parts and low pressure squeezed parts are alternately arranged along the longitudinal direction of the grooves on the bottom surfaces of the vertical and widthwise embossed grooves. In the adhesive article, the longitudinal embossed grooves and the widthwise embossed grooves can be formed while preventing the topsheet from being lifted or torn.
[Brief description of the drawings]
FIG. 1 is a perspective view of a sanitary napkin 1 according to the present invention.
FIG. 2 is an enlarged plan view of a part A in FIG.
FIG. 3 is a view taken along the line III-III in FIG. 2;
FIG. 4 is a diagram for forming embossed grooves 5 and 6;
FIGS. 5A to 5D are other forms of formation in the width direction embossed groove 6. FIG.
FIG. 6 is a plan view of a sanitary napkin N in which conventional embossed grooves 50 and 51 are formed.
FIG. 7 is an enlarged perspective view of an emboss groove 50 (51).
8A is a pattern diagram of formation of longitudinal embossed grooves 50 and widthwise embossed grooves 51 of a napkin subjected to a test, and FIG. 8B is a measurement result of a contact line length corresponding to the embossed pattern. It is a graph.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid-impermeable back sheet, 3 ... Liquid-permeable surface sheet, 4 ... Absorber, 5 ... Longitudinal embossed groove, 6 ... Width direction embossed groove, 12 ... High-pressure pressing part, 14 ... Low pressure

Claims (5)

透液性表面シートと、不透液性裏面シートとの間に吸収体が介在され、前記透液性表面シート面側に略長手方向に沿う縦方向エンボス溝が形成されるとともに、略幅方向に沿う幅方向エンボス溝が形成され、これら縦方向エンボス溝及び幅方向エンボス溝の底面に溝長手方向に沿って高圧搾部と低圧搾部とが交互に配置された吸収性物品において、
吸収性物品の幅方向に、前記エンボス溝を横断する１本の線を引いた場合に、この横断線が前記高圧搾部と接触する部分の長さを横断線上において合計した長さをもって「接触線長さ」と定義し、
前記幅方向エンボス溝において、前記接触線長さを、高圧搾部の間隔、高圧搾部の幅および曲率の内のいずれか又は組み合わせによって調整することにより、前記幅方向エンボス溝が存在する領域の接触線長さの最大値と、前記縦方向エンボス溝が存在する領域の接触線長さの最大値との差が５mm以下となるようにしたことを特徴とする吸収性物品。An absorbent body is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet, and a vertical emboss groove is formed along the substantially longitudinal direction on the liquid-permeable top sheet surface side. In the absorbent article in which the width direction embossed grooves are formed, and the high pressure squeezed parts and the low pressure squeezed parts are alternately arranged along the longitudinal direction of the grooves on the bottom surfaces of the vertical embossed grooves and the widthwise embossed grooves,
In the width direction of the absorbent article, when minus one line traversing the embossing groove, the transverse lines with the total length of the transverse line the length of the portion in contact with the high compression portion "contact Defined as "line length"
In the width direction embossed groove, the contact line length is adjusted by any one or combination of the interval between the high-pressure parts, the width and the curvature of the high-pressure parts, so that the width direction emboss groove exists. absorbent article difference between the maximum value of the contact line length, the maximum contact line length of a region where the the longitudinal embossed groove is present, characterized in that as a 5mm or less. 透液性表面シートと、不透液性裏面シートとの間に吸収体が介在され、前記透液性表面シート面側に略長手方向に沿う方向に長手方向中心線を跨いで左右一対の縦方向エンボス溝が形成されるとともに、略幅方向に沿う方向に平面視で円弧状の幅方向エンボス溝が形成され、これら縦方向エンボス溝及び幅方向エンボス溝の底面に溝長手方向に沿って高圧搾部と低圧搾部とが交互に配置された吸収性物品において、
吸収性物品の幅方向に、前記エンボス溝を横断する１本の線を引いた場合に、この横断線が前記高圧搾部と接触する部分の長さを横断線上において合計した長さをもって「接触線長さ」と定義し、
前記幅方向エンボス溝において、前記接触線長さを、高圧搾部の間隔、高圧搾部の幅および曲率の内のいずれか又は組み合わせによって調整することにより、前記幅方向エンボス溝が存在する領域の接触線長さの最大値と、前記縦方向エンボス溝が存在する領域の接触線長さの最大値との差が５mm以下となるようにしたことを特徴とする吸収性物品。An absorbent body is interposed between the liquid-permeable surface sheet and the liquid-impervious back sheet, and a pair of left and right verticals straddling a longitudinal center line in a direction along the longitudinal direction on the liquid-permeable surface sheet side. Direction embossed grooves are formed, and arcuate widthwise embossed grooves are formed in a plan view in a direction substantially along the width direction, and the vertical embossed grooves and the width direction embossed grooves In the absorbent article in which the pressing parts and the low pressing parts are alternately arranged,
In the width direction of the absorbent article, when minus one line traversing the embossing groove, the transverse lines with the total length of the transverse line the length of the portion in contact with the high compression portion "contact Defined as "line length"
In the width direction embossed groove, the contact line length is adjusted by any one or combination of the interval between the high-pressure parts, the width and the curvature of the high-pressure parts, so that the width direction emboss groove exists. absorbent article difference between the maximum value of the contact line length, the maximum contact line length of a region where the the longitudinal embossed groove is present, characterized in that as a 5mm or less. 前記幅方向エンボス溝の高圧搾部は、縦方向中心線から外方に向かうに従って、高圧搾部の間隔を狭くしてある請求項１〜２いずれかに記載の吸収性物品。The absorbent article according to any one of claims 1 to 2, wherein the high-pressure squeezed portion of the widthwise embossed groove narrows the interval between the high-pressure squeezed portions as it goes outward from the longitudinal center line. 前記幅方向エンボス溝の高圧搾部は、縦方向中心線から外方に向かうに従って、高圧搾部の幅を大きくしてある請求項１〜２いずれかに記載の吸収性物品。The absorbent article according to any one of claims 1 to 2 , wherein the high-pressure portion of the widthwise embossed groove increases the width of the high-pressure portion as it goes outward from the longitudinal center line. 前記幅方向エンボス溝が存在する領域の接触線長さの最大値が４．５〜１０mmである請求項１〜４いずれかに記載の吸収性物品。The absorbent article according to any one of claims 1 to 4 , wherein a maximum value of a contact line length in a region where the widthwise embossed groove exists is 4.5 to 10 mm.
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