JP4058281B2 - Absorbent articles - Google Patents

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JP4058281B2
JP4058281B2 JP2002067319A JP2002067319A JP4058281B2 JP 4058281 B2 JP4058281 B2 JP 4058281B2 JP 2002067319 A JP2002067319 A JP 2002067319A JP 2002067319 A JP2002067319 A JP 2002067319A JP 4058281 B2 JP4058281 B2 JP 4058281B2
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雅也 藤田
幸夫 久米
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Daio Paper Corp
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Description

【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長手方向中心線を跨いで左右一対の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左右一対のエンボス溝を形成する技術が存在する。
【０００４】
たとえば、特開平9-108262号公報では、図８及び図９に示されるように、生理用ナプキンの上面に、長手方向へ延びるとともに、中央部で間隔が狭くなった平面形状により、底面部が高圧搾部５１と低圧搾部５２とを交互に有する左右一対のエンボス溝５０を形成する技術（従来例）が提案されている。同公報では、相対的に密度の高い高圧搾部５１と相対的に密度の低い低圧搾部５２とが交互に並列するため、エンボス溝５０に流入した経血等の体液がエンボス溝５０の長手方向に素早く拡散するのを阻止し、エンボス溝５０からナプキンの側縁に向かって経血等が外方に拡がるのを防止できるとしている。
【０００５】
【発明が解決しようとする課題】
しかしながら、前記従来例に係るエンボス溝５０の場合は、前記高圧搾部５１及び低圧搾部５２が共に、溝底部の内側縁から外側縁にかけて連続して形成されているため、エンボス溝５０の剛性が非常に高くなり、生理用ナプキンの柔軟性が失われ装着感を悪化させてしまうことがある。
【０００６】
また、確かに高圧搾部５１と低圧搾部５２とをエンボス溝の長手方向に交互に並列したことによって、エンボス溝５０の長手方向への拡散が抑えられることになるが、エンボス溝５０に流入した体液、及び毛細管現象によりエンボス溝５０の内側縁部に移動した体液は、エンボス溝５０によってその周辺は吸収体が極度に高密度化された状態となっているため、エンボス溝の横断方向に連続している高圧搾部５１及び低圧搾部５２を通り、エンボス溝５０の外側縁部に到達してしまうため、体液の幅方向への拡散防止という点では未だ不十分であった。
【０００７】
更に、製造ラインにて流れ方向に対して前記エンボス溝５０を付与する場合、溝底面部が高圧搾部５１と低圧搾部５２とが交互に画成されることになるため、表面材の伸び代が溝の幅方向にしか確保されない。その結果、応力の逃げ場が無くなり表面材に破れが生じるなどの問題があった。
【０００８】
そこで本発明の主たる課題は、表面側に左右一対のエンボス溝を形成した吸収性物品において、前記エンボス溝部分の剛化を防止するとともに、エンボス溝の長手方向への体液の拡散と共に、エンボス溝を横断する方向への拡散をも抑制し、更にエンボス加工時に表面材の破れを無くすことにある。
【０００９】
【課題を解決するための手段】
前記課題を解決するために請求項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るとともに、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エンボス溝が形成された吸収性物品において、
前記エンボス溝の底面に、内側縁から外側縁側に向けて延在し、かつ外側縁まで到達しない強圧搾部を溝長手方向に間欠的に形成するとともに、外側縁から内側縁側に向けて延在し、かつ内側縁まで到達しない強圧搾部を溝長手方向に間欠的に形成し、前記内側縁から形成した強圧搾部と、前記外側縁から形成した強圧搾部とが、溝長手方向に交互に配置され、
前記強圧搾部はエンボス溝の内側縁と外側縁とを結ぶ垂線方向に対し、１５〜８０°の交差角度で一様に斜め方向に延在し、かつ前記エンボス溝の内側縁と外側縁とを結ぶ垂線方向線上において、内側縁から外側縁に至る側縁間距離に対する強圧搾部長さの比率が０．４〜０．８であることを特徴とする吸収性物品が提供される。
【００１０】
上記請求項１記載の発明においては、エンボス溝の底面に対し、内側縁から形成される強圧搾部を外側縁に至る手前で止め、外側縁まで到達させないようにしている。従って、強圧搾部以外の通常圧搾部が溝の長手方向に連続するようになるため、エンボス溝部分の剛化を防止することができるようになる。また、溝幅内ではその大部分が、相対的に密度の高い強圧搾部と相対的に密度の低い通常圧搾部とが実質的に交互に並列することになるため、エンボス溝に流入した経血等の体液がエンボス溝の長手方向に素早く拡散するのを抑制することができるとともに、強圧搾部が途中で途切れているため、強圧搾部を移動する体液が外側縁まで到達し難くなるため、幅方向への体液の拡散についても同時に抑制できるようになる。さらに、前記強圧搾部以外の通常圧搾部が溝の長手方向に連続するため、エンボス加工時に表面シートの伸び代が溝の長手方向にも確保されるようになるため、応力が緩和され表面シートの破れも同時に無くすことができるようになる。
【００１１】
また、上記発明では、エンボス溝の内側縁から形成した強圧搾部と、外側縁からも形成した強圧搾部とを溝長手方向に交互に配置するようにした。その結果、エンボス溝付与時に左右の側で表面シート応力の偏りが緩和されるとともに、幅方向にも伸び代が形成されるため、表面シートの破れをより少なくできる。
【００１２】
請求項２に係る本発明として、前記エンボス溝の長手方向線上において、隣接する強圧搾部間距離に対する強圧搾部幅の比率が０．３〜２である請求項１記載の吸収性物品が提供される。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照しながら詳述する。
【００１４】
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。
【００１５】
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。
【００１６】
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。
【００１７】
前記生理用ナプキン１の表面シート面側は、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エンボス溝５，５が形成されている。前記エンボス溝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ている。なお、図示例では前後端部にそれぞれ前後方向漏れを防止するため、平面視で外側に向けて膨出する円弧形状により前後部エンボス溝６，６が形成されている。
【００１８】
前記エンボス溝５は、図２に示されるように、底面に、内側縁１０から外側縁１１側に向けて延在し、かつ外側縁１１まで到達しない強圧搾部１２を溝長手方向に間欠的に形成するとともに、外側縁１１から内側縁１０側に向けて延在し、かつ内側縁１０まで到達しない強圧搾部１３を溝長手方向に間欠的に形成した構造とされる。図示例では、前記内側縁１０から形成した強圧搾部１２、１２…と、前記外側縁１１から形成した強圧搾部１３，１３…とが溝長手方向に交互に配置されている。
【００１９】
前記エンボス溝５の断面形状は、エンボス溝５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部位のナプキン厚をＡとした場合、前記強圧搾部１２部位の厚みＣ＝０．０３〜０．６×Ａ、好ましくは０．０５〜０．３×Ａとし、前記強圧搾部１２，１３以外の通常圧搾部１４部位の厚みＢ＝０．０５〜０．７×Ａ、好ましくは０．０７〜０．４×Ａとし、かつ通常圧搾部１４部位の厚みＢ＞強圧搾部１２，１３部位の厚みＣとする。また、前記通常圧搾部１４と強圧搾部１２、１３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。
【００２０】
また、前記エンボス溝５の内側縁１０と外側縁１１とを結ぶ垂線方向線上において、内側縁１０から外側縁１１に至る側縁間距離Ｌに対する強圧搾部長さｌの比率（ｌ／Ｌ）は０．４〜０．８とするのが望ましい。前記比率が０．４未満の場合は、エンボス溝５の長手方向に沿う液拡散性が大きくなってしまい、前記比率が０．８を超える場合はエンボス溝５部分の剛性が高くなって柔軟性が失われてしまうことになる。具体的に、前記エンボス溝５の側縁部間距離Ｌ（溝の底面幅）は、１〜８mm、好ましくは２〜６mmとするのが望ましい。
【００２１】
更に、前記エンボス溝５の長手方向線上において、隣接する強圧搾部間距離Ｂに対する強圧搾部幅ｂの比率（ｂ／Ｂ）が０．３〜２とするのが望ましい。前記比率が０．３未満である場合には、相対的に強圧搾部間距離Ｂが大きくなり過ぎてエンボス溝５の長手方向に沿う液拡散性が大きくなってしまうとともに、表面シート３の浮きが懸念されるようになる。また、前記比率が２を超える場合には、相対的に強圧搾部間距離Ｂが小さく成り過ぎて表面シート３の破れが生じ易くなるとともに、エンボス溝５部分の剛性が高くなって柔軟性が失われてしまうことになる。具体的に、前記強圧搾幅ｂ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溝形成用加圧ロール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を前記圧搾溝形成用加圧ロール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、５が形成される。前記圧搾溝形成用加圧ロール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。なお、図２に示されるエンボス溝５に対応する前記エンボス溝形成突部２２は、図５に示されるように、当接面に強圧搾部形成凸部２４を両側縁部から長手方向に沿って交互に形成した断面形状となる。
【００２４】
以上、エンボス溝５の底面に、内側縁１０から形成される強圧搾部１２について詳述したが、外側縁１１から形成される強圧搾部１３についても同様の条件で形成することができる。また、前記前後エンボス溝６に対しても、全く同様に強圧搾部１２，１３を形成することができる。
【００２５】
ところで、前記強圧搾部１２，１３は、前述した例のように、エンボス溝５の内側縁１０と外側縁１１とを結ぶ垂線方向に対し平行に延在させてもよいが、好ましくは図６に示されるように、前記垂線方向に交差する方向に延在させるのが望ましい。この場合の交差角度αは概ね１５〜８０°とするのが望ましい。前記強圧搾部１２，１３が斜め方向に延在すると、股間付け根から加わる幅方向の力に対して抵抗体とならず、装着感が良好になる。また、強圧搾部１２の強圧搾部長さｌが平行の場合よりも傾斜分だけ長くなるため、体液が強圧搾部１２を浸透する際の浸透距離が長くなり、体液の拡散をより効果的に防止できるようになる。
【００２６】
〔参考的形態例〕
前記強圧搾部１２、１３の形成態様としては、上記例以外に種々のものが考えられる。例えば図７(A)は内側縁１０から形成する強圧搾部１２を溝長手方向に間欠的に複数、図示例では２つ形成し、外側縁１１から形成する強圧搾部１３を１つ形成するパターンを溝の長手方向に順次繰り返すようにしたパターン例であり、図７(B)は内側縁１０から形成する強圧搾部１２と外側縁１１から形成する強圧搾部１３とを左右対称で形成したパターン例であり、図７(C)は内側縁１０から形成する強圧搾部１２のみを形成したパターン例である。
【００２７】
【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、強圧搾部１２，１３のパターンを異ならせた左右一対のエンボス溝を形成し、表面シートの浮きや破れを目視評価するとともに、使用中の装着感および液拡散性について官能評価を行った。
【００２８】
前記ナプキン供試体において、エンボス溝の強圧搾部は垂線方向から４５°斜め方向に傾斜して形成し（図６の態様）、側縁部間距離Ｌは３mm、強圧搾部幅ｂは１mm、強圧搾部間距離Ｂは１mmで共通とし、強圧搾部長さｌを表１のように種々変化させた。なお、側縁部間距離Ｌと強圧搾部長さｌとを同一、すなわち溝幅を連続して横断する強圧搾部を形成したものを作成し比較対象とした。
【００２９】
前記使用中の装着感評価は、モニター２０人に２時間以上装着してもらい、その時の装着感を良い・悪いの２段階評価で行い、良いと答えた人数で評価した。 また、前記液拡散性評価は、左右のエンボス溝から等距離にある中央部に、３ccの人工血液を１秒間で注入し３分間放置した後、２０名のモニターに外観が良いか悪いかの２段階評価をしてもらい、良いと答えた人数で評価した。
【００３０】
【表１】

Figure 0004058281
【００３１】
【発明の効果】
以上詳説のとおり本発明によれば、表面側に左右一対のエンボス溝を形成した吸収性物品において、エンボス溝部分の剛化を防止できるようになるとともに、エンボス溝の長手方向への体液の拡散と共に、エンボス溝を横断する方向への拡散も同時に抑制できるようになる。また、エンボス加工時に表面材の破れを無くす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】 エンボス溝の形成要領図である。
【図５】 エンボス溝の形成用突部２２の斜視図である。
【図６】 強圧搾部の他の形成例を示す要部拡大平面図である。
【図７】 強圧搾部の更に他の形成例を示す要部拡大平面図である。
【図８】 従来のエンボス溝の形成例を示す要部拡大平面図である。
【図９】 図８のIX−IX線矢視図である。
【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…エンボス溝、６…前後エンボス溝、１０…内側縁、１１…外側縁、１２・１３…強圧搾部、１４…通常圧搾部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads for absorbing menstrual blood and vaginal discharge, and more specifically, on the surface side across the longitudinal center line in a direction substantially along the longitudinal direction. The present invention relates to an absorbent article in which a pair of embossed grooves is formed.
[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, in order to prevent diffusion of body fluid 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 side is affected by heat embossing. There is a technique for forming a pair of embossed grooves.
[0004]
For example, in Japanese Patent Application Laid-Open No. 9-108262, as shown in FIGS. 8 and 9, the bottom surface portion is formed on the upper surface of the sanitary napkin by a planar shape extending in the longitudinal direction and having a narrow interval at the center portion. A technique (conventional example) has been proposed in which a pair of left and right embossed grooves 50 alternately having high-pressure parts 51 and low-pressure parts 52 are formed. In this publication, the high-pressure squeezed parts 51 having a relatively high density and the low-pressure squeezed parts 52 having a relatively low density are alternately arranged in parallel, so that bodily fluids such as menstrual blood flowing into the embossed grooves 50 are elongated in the length of the embossed grooves 50. It is possible to prevent rapid diffusion in the direction and prevent menstrual blood or the like from spreading outward from the embossed groove 50 toward the side edge of the napkin.
[0005]
[Problems to be solved by the invention]
However, in the case of the embossed groove 50 according to the conventional example, since both the high-pressure squeezed part 51 and the low-pressure squeezed part 52 are continuously formed from the inner edge to the outer edge of the groove bottom part, the rigidity of the embossed groove 50. May become very high, and the sanitary napkin may lose its flexibility and deteriorate the feeling of wearing.
[0006]
Moreover, although the high pressing parts 51 and the low pressing parts 52 are arranged in parallel in the longitudinal direction of the embossing grooves, diffusion in the longitudinal direction of the embossing grooves 50 can be suppressed. The body fluid that has moved to the inner edge of the embossed groove 50 due to the capillary phenomenon is in a state in which the absorber is extremely densified by the embossed groove 50, and therefore the transverse direction of the embossed groove Since it passes through the continuous high-pressure squeezed part 51 and low-pressure squeezed part 52 and reaches the outer edge of the embossed groove 50, it is still insufficient in terms of preventing diffusion of body fluid in the width direction.
[0007]
Further, when the embossed groove 50 is provided in the flow direction in the production line, the groove bottom surface portion is alternately defined by the high-pressure squeezed portion 51 and the low-pressure squeezed portion 52, so that the elongation of the surface material is increased. The margin is secured only in the width direction of the groove. As a result, there is a problem that the stress material has no escape and the surface material is torn.
[0008]
Therefore, the main problem of the present invention is to prevent the embossed groove portion from being stiffened in the absorbent article having a pair of left and right embossed grooves on the surface side, and to disperse body fluid in the longitudinal direction of the embossed groove, and It is also intended to suppress diffusion in the direction crossing the surface and to eliminate the tearing of the surface material during embossing.
[0009]
[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. In the absorbent article in which a pair of left and right embossed grooves is formed across the longitudinal center line in a direction along the substantially longitudinal direction,
On the bottom surface of the embossed groove, a strong squeezing portion that extends from the inner edge toward the outer edge and does not reach the outer edge is intermittently formed in the groove longitudinal direction, and extends from the outer edge toward the inner edge. And the strong pressing part which does not reach the inner edge is intermittently formed in the groove longitudinal direction, and the strong pressing part formed from the inner edge and the strong pressing part formed from the outer edge are alternately arranged in the groove longitudinal direction. Placed in
The squeezed portion extends uniformly in an oblique direction at an intersecting angle of 15 to 80 ° with respect to a direction perpendicular to the inner edge and the outer edge of the embossed groove, and the inner edge and the outer edge of the embossed groove An absorbent article is provided in which the ratio of the length of the squeezed portion with respect to the distance between the side edges from the inner edge to the outer edge is 0.4 to 0.8 on the perpendicular line connecting the two .
[0010]
In the first aspect of the present invention, the strong pressing portion formed from the inner edge is stopped before reaching the outer edge with respect to the bottom surface of the embossed groove so as not to reach the outer edge. Accordingly, since the normal squeezing part other than the strong squeezing part is continuous in the longitudinal direction of the groove, it becomes possible to prevent the embossed groove part from being stiffened. In addition, the majority of the groove width within the groove width is that the relatively high-density squeezed portions and the relatively low-density normal squeezed portions are substantially alternately arranged in parallel. The body fluid such as blood can be prevented from quickly diffusing in the longitudinal direction of the embossed groove, and the strong squeezed part is interrupted in the middle, so that the body fluid moving through the strong squeezed part is difficult to reach the outer edge. The diffusion of body fluid in the width direction can be suppressed at the same time. Furthermore, since normal pressing parts other than the said strong pressing part continue in the longitudinal direction of a groove | channel, since the expansion allowance of a surface sheet comes to be ensured also in the longitudinal direction of a groove | channel at the time of embossing, stress is relieved and a surface sheet Can be eliminated at the same time.
[0011]
Moreover, in the said invention, the strong pressing part formed from the inner edge of the embossing groove | channel and the strong pressing part also formed from the outer edge were arrange | positioned alternately in a groove | channel longitudinal direction. As a result, the unevenness of the surface sheet stress is reduced on the left and right sides when embossed grooves are provided, and the elongation margin is formed in the width direction.
[0012]
As the present invention according to claim 2, in the longitudinal direction line of the embossed grooves, the absorbent article of the ratio of the strong compressing portion width to the distance between adjacent strong compression portions is 0.3 to 2 claim 1 Symbol placement is Provided.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
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.
[0015]
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.
[0016]
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.
[0017]
The surface sheet surface side of the sanitary napkin 1 integrates the surface sheet 3 and the absorbent body 4 to prevent displacement, and raises the blood drainage site of the absorbent body 4 to improve the adhesion to the local area. Furthermore, for the purpose of preventing the side leakage of menstrual blood, a pair of left and right embossed grooves 5 and 5 are formed across the longitudinal center line S in a direction substantially along the longitudinal direction. The embossed grooves 5 and 5 are formed in an arc shape that bulges toward the center line S in the longitudinal direction in plan view. In the illustrated example, the front and rear embossed grooves 6 and 6 are formed in arc shapes that bulge outward in a plan view in order to prevent front and rear end leakage at the front and rear ends.
[0018]
As shown in FIG. 2, the embossed groove 5 is intermittently provided in the groove longitudinal direction on the bottom surface of the strong pressing portion 12 that extends from the inner edge 10 toward the outer edge 11 and does not reach the outer edge 11. In addition, the strong pressing portion 13 that extends from the outer edge 11 toward the inner edge 10 and does not reach the inner edge 10 is formed intermittently in the longitudinal direction of the groove. In the example of illustration, the strong pressing parts 12, 12 ... formed from the inner edge 10 and the strong pressing parts 13, 13 ... formed from the outer edge 11 are alternately arranged in the longitudinal direction of the groove.
[0019]
The cross-sectional shape of the embossed groove 5 is such that when the napkin thickness of the embossed groove 5 site is A with reference to the virtual napkin shape line K before the embossed groove 5 is applied, the thickness C of the strongly compressed portion 12 site is C = 0. 0.03-0.6 × A, preferably 0.05-0.3 × A, and thickness B = 0.05-0.7 × A of the normal pressing portion 14 other than the strong pressing portions 12, 13; Preferably, the thickness is 0.07 to 0.4 × A, and the thickness B of the normal pressing portion 14 site> the thickness C of the strong pressing portions 12 and 13 site. Moreover, the difference (BC) between the said normal pressing part 14 and the strong pressing parts 12 and 13 is 0.02-2 mm, Preferably it is 0.1-1.0 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. .
[0020]
Further, on the perpendicular line connecting the inner edge 10 and the outer edge 11 of the embossed groove 5, the ratio (l / L) of the strong pressing portion length l to the side edge distance L from the inner edge 10 to the outer edge 11 is It is desirable to set it as 0.4-0.8. When the ratio is less than 0.4, the liquid diffusibility along the longitudinal direction of the embossed groove 5 increases, and when the ratio exceeds 0.8, the embossed groove 5 portion has high rigidity and flexibility. Will be lost. Specifically, the distance L between the side edges of the embossed groove 5 (the bottom width of the groove) is 1 to 8 mm, preferably 2 to 6 mm.
[0021]
Furthermore, it is desirable that the ratio (b / B) of the strong pressing portion width b to the distance B between adjacent strong pressing portions on the longitudinal line of the embossed groove 5 is 0.3-2. In the case where the ratio is less than 0.3, the distance B between the strong pressing parts becomes relatively large so that the liquid diffusibility along the longitudinal direction of the embossed groove 5 becomes large, and the surface sheet 3 floats. Will become a concern. Moreover, when the said ratio exceeds 2, while the distance B between strong pressing parts becomes comparatively small, it becomes easy to produce the tear of the surface sheet 3, and the rigidity of the embossing groove | channel 5 part becomes high, and flexibility is provided. It will be lost. Specifically, the squeezing width b is 0.5 to 6 mm, preferably 1 to 4 mm.
[0022]
As shown in FIG. 4, the embossed groove 5 is formed by passing the compressed groove forming device 20 in a state where the absorbent body 4 and the topsheet 3 are laminated in the manufacturing process of the sanitary napkin 1. .
[0023]
The pressing groove forming device 20 is a device comprising a pressing groove forming pressure roll 21 having embossed groove forming protrusions 22, 22... On the peripheral surface, and an anvil roll 23 that receives pressure, and the sanitary napkin 1. By passing the narrow space between the pressing roll forming pressure roll 21 and the anvil roll 23, the groove forming protrusion 22 squeezes the absorbent body 4 together with the top sheet 3 from the top sheet 3 side, and the embossed groove 5. 5 are formed. In consideration of the melting point of the topsheet 3 and the pressing time, the temperature of the pressing groove forming pressure roll 21 is desirably in the range of 50 to 200 ° C. 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. 2, the embossed groove forming protrusion 22 corresponding to the embossed groove 5 shown in FIG. 2 has a strong pressing portion forming convex portion 24 on the contact surface along the longitudinal direction from both side edges. The cross-sectional shape is alternately formed.
[0024]
As mentioned above, although the strong pressing part 12 formed from the inner edge 10 was explained in full detail in the bottom face of the embossing groove | channel 5, it can form on the same conditions also about the strong pressing part 13 formed from the outer edge 11. FIG. Moreover, the strong pressing parts 12 and 13 can be formed in the same manner for the front and rear embossed grooves 6.
[0025]
By the way, although the said strong pressing parts 12 and 13 may be extended in parallel with the perpendicular direction which ties the inner edge 10 and the outer edge 11 of the embossing groove | channel 5 like the example mentioned above, Preferably FIG. As shown in FIG. 4, it is desirable that the first electrode extends in a direction crossing the perpendicular direction. In this case, the crossing angle α is preferably about 15 to 80 °. When the strong squeezed portions 12 and 13 extend in an oblique direction, the squeezed portions 12 and 13 do not become a resistance against the force in the width direction applied from the crotch root, and the wearing feeling is improved. Moreover, since the strong squeezing part length l of the strong squeezing part 12 is longer than the parallel case by an inclination, the permeation distance when the body fluid permeates the strong squeezing part 12 is increased, and the diffusion of the body fluid is more effectively performed. Can be prevented.
[0026]
[Reference form example]
Various forms other than the above-described examples are conceivable as the formation mode of the strong pressing parts 12 and 13. For example, in FIG. 7A, a plurality of strong pressing parts 12 formed from the inner edge 10 are intermittently formed in the groove longitudinal direction, two in the illustrated example, and one strong pressing part 13 formed from the outer edge 11 is formed. FIG. 7B shows a pattern example in which the pattern is sequentially repeated in the longitudinal direction of the groove, and FIG. 7B shows a strong pressing portion 12 formed from the inner edge 10 and a strong pressing portion 13 formed from the outer edge 11 symmetrically formed. FIG. 7C shows a pattern example in which only the strong pressing part 12 formed from the inner edge 10 is formed.
[0027]
【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. A pair of left and right embossed grooves with different patterns of the strong squeezed portions 12 and 13 is formed on the surface side of the sanitary napkin, and visually evaluated for floating and tearing of the surface sheet, and wearing feeling during use And sensory evaluation was performed about liquid diffusibility.
[0028]
In the napkin specimen, the strong squeezed portion of the embossed groove is inclined 45 ° obliquely from the perpendicular direction (aspect of FIG. 6), the distance L between the side edges is 3 mm, the strong squeezed portion width b is 1 mm, The distance B between the strong pressing parts was 1 mm, and the length 1 of the strong pressing part was variously changed as shown in Table 1. In addition, what formed the strong pressing part which crossed the groove width continuously and made the same the distance L between the side edge parts and the strong pressing part length l, and made it the comparison object.
[0029]
The wearing feeling evaluation during use was evaluated by the number of respondents who answered that it was good, with 20 monitors wearing for 2 hours or more, and carrying out the wearing feeling at that time in a good / bad two-stage evaluation. In addition, the liquid diffusibility evaluation was conducted by injecting 3 cc of artificial blood into the central part equidistant from the left and right embossed grooves for 1 second and leaving it for 3 minutes. A two-stage evaluation was performed, and the number of people who answered that it was good was evaluated.
[0030]
[Table 1]
Figure 0004058281
[0031]
【The invention's effect】
As described above in detail, according to the present invention, in an absorbent article in which a pair of left and right embossed grooves are formed on the surface side, stiffening of the embossed groove portion can be prevented and body fluid diffuses in the longitudinal direction of the embossed groove. At the same time, diffusion in the direction crossing the embossed groove can be suppressed at the same time. Moreover, it becomes possible to eliminate the tearing of the surface material during embossing.
[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.
FIG. 5 is a perspective view of a protrusion 22 for forming an emboss groove.
FIG. 6 is an enlarged plan view of a main part showing another example of forming the strong pressing part.
FIG. 7 is an essential part enlarged plan view showing still another example of forming the strong squeezed part.
FIG. 8 is an enlarged plan view of a main part showing an example of forming a conventional emboss groove.
9 is a view taken along the line IX-IX in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impervious back sheet, 3 ... Impervious surface sheet, 4 ... Absorber, 5 ... Embossed groove, 6 ... Front and rear embossed groove, 10 ... Inner edge, 11 ... Outer edge, 12 -13 ... Strong pressing part, 14 ... Normal pressing part

Claims (2)

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るとともに、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エンボス溝が形成された吸収性物品において、
前記エンボス溝の底面に、内側縁から外側縁側に向けて延在し、かつ外側縁まで到達しない強圧搾部を溝長手方向に間欠的に形成するとともに、外側縁から内側縁側に向けて延在し、かつ内側縁まで到達しない強圧搾部を溝長手方向に間欠的に形成し、前記内側縁から形成した強圧搾部と、前記外側縁から形成した強圧搾部とが、溝長手方向に交互に配置され、
前記強圧搾部はエンボス溝の内側縁と外側縁とを結ぶ垂線方向に対し、１５〜８０°の交差角度で一様に斜め方向に延在し、かつ前記エンボス溝の内側縁と外側縁とを結ぶ垂線方向線上において、内側縁から外側縁に至る側縁間距離に対する強圧搾部長さの比率が０．４〜０．８である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 layers straddling the longitudinal center line in the direction substantially along the longitudinal direction on the liquid-permeable surface sheet surface side In the absorbent article in which the embossed groove of
On the bottom surface of the embossed groove, a strong squeezed portion that extends from the inner edge toward the outer edge and does not reach the outer edge is intermittently formed in the groove longitudinal direction, and extends from the outer edge toward the inner edge. And the strong pressing part which does not reach the inner edge is intermittently formed in the groove longitudinal direction, and the strong pressing part formed from the inner edge and the strong pressing part formed from the outer edge are alternately arranged in the groove longitudinal direction. Placed in
The squeezed portion extends uniformly in an oblique direction at an intersecting angle of 15 to 80 ° with respect to a direction perpendicular to the inner edge and the outer edge of the embossed groove, and the inner edge and the outer edge of the embossed groove The absorbent article characterized in that the ratio of the length of the squeezed portion to the distance between the side edges from the inner edge to the outer edge is 0.4 to 0.8 on the perpendicular direction line connecting the two . 前記エンボス溝の長手方向線上において、隣接する強圧搾部間距離に対する強圧搾部幅の比率が０．３〜２である請求項１記載の吸収性物品。Longitudinal in the direction line, the absorbent article of the ratio of the strong compressing portion width to the distance between adjacent strong compression portions is 0.3 to 2 claim 1 Symbol placement of the embossed grooves.
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