JP6310438B2 - Absorbent articles - Google Patents

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JP6310438B2
JP6310438B2 JP2015213914A JP2015213914A JP6310438B2 JP 6310438 B2 JP6310438 B2 JP 6310438B2 JP 2015213914 A JP2015213914 A JP 2015213914A JP 2015213914 A JP2015213914 A JP 2015213914A JP 6310438 B2 JP6310438 B2 JP 6310438B2
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basis weight
weight portion
low basis
absorbent article
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JP2017080243A5 (en
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涼子 栗原
涼子 栗原
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Daio Paper Corp
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Priority to PCT/JP2016/082032 priority patent/WO2017073718A1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A61F13/533—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having discontinuous areas of compression

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Description

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に係り、詳しくは複数のブロック状に区画された凹凸形状の吸収体を備えた吸収性物品に関する。   The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads for absorbing menstrual blood or vaginal discharge, and more specifically, provided with a concavo-convex absorbent body partitioned into a plurality of blocks. The present invention relates to an absorbent article.

従来より、前記吸収性物品として、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吸収体を介在したものが知られている。   Conventionally, as the absorbent article, an absorbent body is interposed between a liquid-impermeable 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. It has been known.

この種の吸収性物品にも幾多の改良が重ねられ、着用者の身体の動きに追従する柔軟性を持たせ、体液を素早く吸収・拡散させることなどを目的として、吸収体を複数のブロック状に区画して凹凸形状に形成したものが種々開発されている。例えば下記特許文献１においては、吸収体の縦方向と横方向とのそれぞれの方向に、非肌当接面側から厚み方向に窪んだ溝状の凹部と、該凹部の肌当接面側の底部の凹部吸収部とで構成される通液構造が配され、該通液構造に囲まれた領域に、非肌当接面側に突出したブロック状の突出吸収部を備えた吸収性物品が開示されている。   Numerous improvements have been made to this type of absorbent article to provide flexibility to follow the movement of the wearer's body and to absorb and diffuse bodily fluids in multiple blocks. Various ones that are divided into two to form a concavo-convex shape have been developed. For example, in the following Patent Document 1, in each of the longitudinal direction and the lateral direction of the absorbent body, a groove-shaped recess that is recessed in the thickness direction from the non-skin contact surface side, and the skin contact surface side of the recess An absorbent article comprising a liquid-absorbing structure composed of a bottom-part recessed absorbent portion and a block-shaped projecting absorbent portion projecting to the non-skin contact surface side in an area surrounded by the liquid-permeable structure It is disclosed.

また、下記特許文献２においては、吸収性コアは、吸収性材料が相対的に多い高坪量部と、吸収性材料が相対的に少ない低坪量部とを有し、該高坪量部と低坪量部とが所定方向に交互に形成されている吸収性物品が開示されている。   Moreover, in the following patent document 2, an absorptive core has a high basic weight part with a relatively large amount of absorbent material and a low basic weight part with a relatively small amount of absorbent material, and the high basic weight part. And an absorbent article in which low basis weight portions are alternately formed in a predetermined direction is disclosed.

特開２０１２−１３０３６４号公報JP 2012-130364 A 特開２０１３−６６６７０号公報JP 2013-66670 A

しかしながら、上記特許文献１記載の吸収性物品では、吸収体は、平面方向に連続した低密度領域に囲まれた領域に、平面方向に非連続の高密度領域を配置した構造からなるため、前記低密度領域の存在によって吸収体のコシが低下し、装着時に脚の付け根の内側部分によって幅方向両側から内側に向けて作用する脚圧や身体の動きに伴う圧力などによって吸収体が変形しやすく、ヨレが生じやすい問題があった。   However, in the absorbent article described in Patent Document 1, the absorbent body has a structure in which discontinuous high-density regions are arranged in the planar direction in a region surrounded by low-density regions that are continuous in the planar direction. The presence of the low-density area reduces the stiffness of the absorbent body, and the absorbent body is easily deformed by leg pressure acting inward from both sides in the width direction by the inner part of the base of the leg when worn and pressure caused by body movement. , There was a problem that was likely to occur.

また、上記特許文献２記載の吸収性物品では、表面シート及び吸収性コアを一体的に凹陥してなる溝が、吸収性コアの凹凸を跨ぐように、所定方向に並んだ２個の高坪量部（凸部）とこれら２個の高坪量部に挟まれた１個の低坪量部（凹部）とに連なって形成されているため、この溝が形成された部分では吸収体が補強されコシがでて吸収体の変形が抑制されるものの、前記溝が形成されない部分では前記低坪量部の存在によって吸収体のコシが低下しヨレ易いという問題があった。   Further, in the absorbent article described in Patent Document 2, two high-tsubos arranged in a predetermined direction so that a groove formed by integrally recessing the topsheet and the absorbent core straddles the unevenness of the absorbent core. Since it is formed continuously with the amount portion (convex portion) and one low basis weight portion (concave portion) sandwiched between these two high basis weight portions, the absorber is formed in the portion where this groove is formed. Although it is reinforced and firm and deformation of the absorber is suppressed, there is a problem that in the portion where the groove is not formed, the stiffness of the absorber is lowered due to the presence of the low basis weight portion, and it is easy to twist.

また、上記特許文献１、２記載の吸収性物品では、高密度領域又は高坪量部がブロック状に形成され、低密度領域又は低坪量部によって区画されているため、吸収された体液の拡散性が劣っていた。   Moreover, in the absorbent article of the said patent document 1, 2, since the high-density area | region or the high basic weight part is formed in the block shape, and is divided by the low density area | region or the low basic weight part, Diffusibility was poor.

そこで本発明の主たる課題は、体液を素早く平面方向に拡散させるとともに、吸収体にコシを持たせてヨレを防止した吸収性物品を提供することにある。   Accordingly, a main object of the present invention is to provide an absorbent article in which body fluid is quickly diffused in a planar direction and the absorbent body is stiff to prevent twisting.

上記課題を解決するために請求項１に係る本発明として、少なくとも吸収体を備えた吸収性物品であって、
前記吸収体は、一定方向の並列線と、これと交差する方向の並列線とからなる相対的に低い坪量で形成された低坪量部と、前記低坪量部によって区画された領域にブロック状に形成されるとともに相対的に高い坪量で形成された高坪量部とを有し、かつ各高坪量部を通る連続する平面パターンで前記吸収体が厚み方向に圧搾された凹溝が形成され、
前記低坪量部は、吸収性物品の長手方向に沿って延びるとともに吸収性物品の幅方向に間隔をあけて複数形成され、かつ吸収性物品の幅方向に沿って延びるとともに吸収性物品の長手方向に間隔をあけて複数形成された格子状に配置され、
前記凹溝は、格子状の前記低坪量部と長手方向及び幅方向にそれぞれ同じピッチの格子状に形成されるとともに、該凹溝の長手方向線及び幅方向線がそれぞれ前記高坪量部の中央で交差するように配置されていることを特徴とする吸収性物品が提供される。 In order to solve the above problems, the present invention according to claim 1 is an absorbent article including at least an absorbent,
The absorbent body has a low basis weight portion formed with a relatively low basis weight composed of a parallel line in a certain direction and a parallel line in a direction intersecting with the parallel line, and an area partitioned by the low basis weight portion. A concave formed in a block shape and having a high basis weight portion formed with a relatively high basis weight, and the absorbent body squeezed in the thickness direction in a continuous plane pattern passing through each high basis weight portion Grooves are formed,
The low basis weight portion extends along the longitudinal direction of the absorbent article and is formed in plural at intervals in the width direction of the absorbent article, and extends along the width direction of the absorbent article and extends along the longitudinal direction of the absorbent article. Arranged in a grid formed with multiple gaps in the direction,
The groove is formed in a lattice shape having the same pitch in the longitudinal direction and the width direction as the lattice-shaped low basis weight portion, and the longitudinal line and the width direction line of the groove are respectively the high basis weight portion. An absorbent article is provided that is disposed so as to intersect at the center of the article.

上記請求項１記載の発明では、前記吸収体として、一定方向の並列線と、これと交差する方向の並列線とからなる相対的に低い坪量で形成された低坪量部と、前記低坪量部によって区画された領域にブロック状に形成されるとともに相対的に高い坪量で形成された高坪量部とを有している。また、前記吸収体には、各高坪量部を通る連続する平面パターンで、該吸収体を厚み方向に圧搾した凹溝が形成されている。従って、吸収体に浸透した体液は、前記凹溝を通じて吸収体の平面方向の広い範囲に素早く拡散するようになる。また、前記凹溝が各高坪量部を通る連続する平面パターンで施されているため、前記低坪量部を設けることによって低下した吸収体のコシを補強することができ、装着時に外部からの圧力によって変形しにくく、吸収性物品のヨレが防止できるようになる。   In the first aspect of the invention, as the absorber, a low basis weight portion formed of a relatively low basis weight composed of a parallel line in a certain direction and a parallel line in a direction intersecting with the parallel line, and the low It has a high basis weight part formed in a block shape in a region partitioned by the basis weight part and formed with a relatively high basis weight. Moreover, the said absorber is provided with the ditch | groove which squeezed this absorber to the thickness direction by the continuous plane pattern which passes each high basic weight part. Therefore, the body fluid that has penetrated into the absorbent body quickly diffuses through the concave groove to a wide range in the planar direction of the absorbent body. Moreover, since the said ditch | groove is given by the continuous plane pattern which passes each high basic weight part, the stiffness of the absorber which fell by providing the said low basic weight part can be reinforced, and it attaches from the outside at the time of mounting | wearing It is difficult to be deformed by the pressure of, and the absorbent article can be prevented from twisting.

また、上記請求項１記載の発明は、前記低坪量部を吸収性物品の長手方向及び幅方向に沿った格子状の平面パターンで配置することによって、高坪量部を略矩形状に形成したものである。   In the invention according to claim 1, the high basis weight part is formed in a substantially rectangular shape by arranging the low basis weight part in a lattice-like plane pattern along the longitudinal direction and the width direction of the absorbent article. It is a thing.

請求項２に係る本発明として、前記凹溝は、閉合形状の単位図形が平面方向に複数連続して配置されたパターンで形成され、前記単位図形が隣接する複数の前記高坪量部に跨るように形成されている請求項１記載の吸収性物品が提供される。   As the present invention according to claim 2, the concave groove is formed in a pattern in which a plurality of closed unit graphics are continuously arranged in the plane direction, and the unit graphics straddle a plurality of adjacent high basis weight portions. An absorbent article according to claim 1 is provided.

上記請求項２記載の発明では、前記凹溝の平面パターンとして、閉合形状の単位図形を平面方向に複数連続して配置したパターンで形成するとともに、前記単位図形を隣接する複数の前記高坪量部に跨るように形成しているため、隣接する高坪量部とその間に存在する低坪量部とに跨って前記凹溝の単位図形が配置され、この低坪量部にコシを持たせることができ、高坪量部が移動してヨレるのが防止できるようになる。   In the invention of claim 2, as the planar pattern of the concave grooves, the unit graphic is formed in a pattern in which a plurality of closed unit graphics are continuously arranged in the plane direction, and the unit graphics are adjacent to the plurality of high basis weights. Since it is formed so as to straddle the part, the unit figure of the concave groove is arranged straddling the adjacent high basis weight part and the low basis weight part existing between them, and this low basis weight part is given a firmness. It is possible to prevent the high basis weight portion from moving and twisting.

請求項３に係る本発明として、前記単位図形が矩形、菱形、円形又は楕円形によって形成されている請求項２記載の吸収性物品が提供される。   As the present invention according to claim 3, there is provided an absorbent article according to claim 2, wherein the unit graphic is formed of a rectangle, a rhombus, a circle or an ellipse.

上記請求項３記載の発明では、前記凹溝を構成する単位図形として、矩形、菱形、円形又は楕円形によって形成することが可能であることを規定している。   In the third aspect of the present invention, it is defined that the unit figure constituting the concave groove can be formed by a rectangle, a rhombus, a circle or an ellipse.

請求項４に係る本発明として、前記低坪量部が間欠線からなるとともに、前記凹溝が通る部分に前記低坪量部の間欠部が位置し、かつ前記低坪量部の間欠部が相対的に坪量が高い高坪量部とされている請求項１〜３いずれかに記載の吸収性物品が提供される。   As this invention which concerns on Claim 4, while the said low basic weight part consists of an intermittent line, the intermittent part of the said low basic weight part is located in the part where the said ditch | groove passes, and the intermittent part of the said low basic weight part is The absorptive article according to any one of claims 1 to 3 provided as a high basis weight part having a relatively high basis weight.

上記請求項４記載の発明では、前記低坪量部を間欠線によって形成し、前記凹溝が通る部分に前記低坪量部の間欠部が位置するようにするとともに、前記低坪量部の間欠部を相対的に坪量が高い高坪量部としている。このように、前記凹溝を付加する部分を高坪量部で連続させることによって、吸収体に凹溝を設ける際の圧搾力が均等に作用し、凹溝の形状を維持しやすくなる。   In the invention of claim 4, the low basis weight portion is formed by an intermittent line so that the intermittent portion of the low basis weight portion is located in a portion through which the concave groove passes, and the low basis weight portion of the low basis weight portion. The intermittent portion is a high basis weight portion having a relatively high basis weight. Thus, by continuing the part which adds the said ditch | groove in a high basic weight part, the pressing force at the time of providing a ditch | groove in an absorber acts equally, and it becomes easy to maintain the shape of a ditch | groove.

以上詳説のとおり本発明によれば、体液を素早く平面方向に拡散できるとともに、吸収体にコシを持たせてヨレが防止できるようになる。   As described above in detail, according to the present invention, body fluid can be quickly diffused in the plane direction, and the absorbent body can be stiff to prevent twisting.

本発明に係る生理用ナプキン１の一部破断展開図である。It is a partial fracture development view of sanitary napkin 1 concerning the present invention. 図１のII−II線矢視図である。It is the II-II arrow directional view of FIG. 吸収体４の平面図である。4 is a plan view of the absorber 4. FIG. 吸収体４の作製要領を示す斜視図である。It is a perspective view which shows the preparation points of the absorber. 吸収体４の変形例を示す平面図（その１）である。It is a top view (the 1) which shows the modification of absorber 4. 吸収体４の斜視図である。FIG. 6 is a perspective view of the absorber 4. 吸収体４の変形例を示す平面図（その２）である。It is a top view (the 2) showing the modification of absorber 4. 吸収体４の変形例を示す平面図（その３）である。FIG. 11 is a plan view (No. 3) showing a modified example of the absorbent body 4. 生理用ナプキン１の変形例を示す断面図である。It is sectional drawing which shows the modification of the sanitary napkin. 製造装置３０の模式図である。2 is a schematic diagram of a manufacturing apparatus 30. FIG. 集積用凹部３１に吸収体前駆体３６が形成される過程を模式的に示す断面図である。FIG. 6 is a cross-sectional view schematically showing a process of forming an absorber precursor 36 in the accumulation recess 31.

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。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

〔生理用ナプキン１の基本構成〕
本発明に係る生理用ナプキン１は、図１及び図２に示されるように、ポリエチレンシート、ポリプロピレンシートなどからなる不透液性裏面シート２と、経血やおりものなどを速やかに透過させる透液性表面シート３と、これら両シート２，３間に介在された綿状パルプまたは合成パルプなどからなる吸収体４とから主に構成されている。また、図示しないが、必要に応じて前記吸収体４の形状保持および拡散性向上のために前記吸収体４を囲繞するクレープ紙又は不織布などからなる被包シートを設けることができる。 [Basic structure of sanitary napkin 1]
As shown in FIGS. 1 and 2, the sanitary napkin 1 according to the present invention has a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, or the like, and a permeate that quickly permeates menstrual blood or a cage. It is mainly composed of a liquid surface sheet 3 and an absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3. Although not shown, an encapsulating sheet made of crepe paper or non-woven fabric surrounding the absorbent body 4 can be provided as necessary to maintain the shape of the absorbent body 4 and improve diffusibility.

以下、さらに前記生理用ナプキン１の構造について詳述すると、
前記不透液性裏面シート２は、ポリエチレンやポリプロピレン等のオレフィン系樹脂シートなどの少なくとも遮水性を有するシート材が用いられるが、この他にポリエチレンシート等に不織布を積層したラミネート不織布や、さらには防水フィルムを介在して実質的に不透液性を確保した上で不織布シート（この場合には防水フィルムと不織布とで不透液性裏面シートを構成する。）などを用いることができる。近年はムレ防止の観点から透湿性を有するものが用いられる傾向にある。この遮水・透湿性シート材は、ポリエチレンやポリプロピレン等のオレフィン系樹脂中に無機充填剤を溶融混練してシートを成形した後、一軸または二軸方向に延伸することにより得られる微多孔性シートである。 Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as an olefin resin sheet such as polyethylene or polypropylene is used. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or A nonwoven fabric sheet (in this case, the waterproof film and the nonwoven fabric constitute a liquid-impervious back sheet) can be used after substantially impervious to liquid imperviousness by interposing a waterproof film. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. This water- and moisture-permeable sheet material is a microporous sheet obtained by forming a sheet by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching in a uniaxial or biaxial direction. It is.

次いで、前記透液性表面シート３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、たと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、スパンレース法、スパンボンド法、サーマルボンド法、メルトブローン法、ニードルパンチ法等の適宜の加工法によって得られた不織布を用いることができる。これらの加工法の内、スパンレース法は柔軟性、スパンボンド法はドレープ性に富む点で優れ、サーマルボンド法及びエアスルー法は嵩高で圧縮復元性が高い点で優れている。   Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and the spunbond method is excellent in drapeability, and the thermal bond method and the air-through method are excellent in terms of being bulky and having high compression recovery properties.

前記吸収体４の周囲において、前記不透液性裏面シート２と透液性表面シート３との外縁部がホットメルトなどの接着剤やヒートシール等の接着手段によって接合され、外周に吸収体４の存在しない外周フラップ部が形成されている。また、前記透液性表面シート３と不透液性裏面シート２との間に吸収体４が介在された本体部分の両側部にはそれぞれ、前記透液性表面シート３の一部が側方に延在されるとともに、同じく側方に延在された不透液性裏面シート２の一部とにより、装着時に下着のクロッチ部分を巻き込むようにして固定されるウイング状フラップＷ、Ｗが形成されている。   Around the absorber 4, the outer edge portion of the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is joined by an adhesive such as hot melt or an adhesive means such as heat seal, and the absorber 4 is disposed on the outer periphery. The outer peripheral flap part which does not exist is formed. Further, a part of the liquid-permeable surface sheet 3 is laterally disposed on both side portions of the main body portion in which the absorbent body 4 is interposed between the liquid-permeable surface sheet 3 and the liquid-impermeable back sheet 2. Wing-shaped flaps W and W that are fixed so as to enclose the crotch portion of the underwear at the time of wearing are formed by a part of the liquid-impervious back sheet 2 that also extends laterally. Has been.

前記不透液性裏面シート２と透液性表面シート３との間に介在される吸収体４は、たとえばパルプ中に高吸水性樹脂を混入したもの、或いはパルプ中に化学繊維を混入させるとともに、高吸水性樹脂を混入したものが使用される。前記吸収体４は、図示しないが、形状保持、および経血等を速やかに拡散させるとともに、一旦吸収した経血等の逆戻りを防止するためにクレープ紙や不織布などからなる被包シートによって囲繞するのが望ましい。前記パルプとしては、木材から得られる化学パルプ、溶融パルプ等のセルロース繊維や、レーヨン、アセテート等の人工セルロース繊維からなるものが挙げられ、広葉樹パルプよりは繊維長の長い針葉樹パルプの方が機能および価格の面で好適に使用される。   The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is, for example, a mixture of a superabsorbent resin in pulp or a mixture of chemical fibers in the pulp. In addition, those mixed with a superabsorbent resin are used. Although not shown in the drawings, the absorbent body 4 is surrounded by an encapsulating sheet made of crepe paper or non-woven fabric in order to rapidly retain shape retention, menstrual blood, etc., and to prevent reversal of menstrual blood once absorbed. Is desirable. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as molten pulp, and those made of artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of price.

また、前記吸収体４には合成繊維を混合しても良い。前記合成繊維は、例えばポリエチレン又はポリプロピレン等のポリオレフィン系、ポリエチレンテレフタレートやポリブチレンテレフタレート等のポリエステル系、ナイロンなどのポリアミド系、及びこれらの共重合体などを使用することができるし、これら２種を混合したものであってもよい。また、融点の高い繊維を芯とし融点の低い繊維を鞘とした芯鞘型繊維やサイドバイサイド型繊維、分割型繊維などの複合繊維も用いることができる。前記合成繊維は、体液に対する親和性を有するように、疎水性繊維の場合には親水化剤によって表面処理したものを用いるのが望ましい。   The absorbent body 4 may be mixed with synthetic fibers. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. In the case of a hydrophobic fiber, it is desirable to use a synthetic fiber that has been surface-treated with a hydrophilizing agent so as to have an affinity for body fluids.

前記高吸水性樹脂としては、たとえばポリアクリル酸塩架橋物、自己架橋したポリアクリル酸塩、アクリル酸エステル−酢酸ビニル共重合体架橋物のケン化物、イソブチレン・無水マレイン酸共重合体架橋物、ポリスルホン酸塩架橋物や、ポリエチレンオキシド、ポリアクリルアミドなどの水膨潤性ポリマーを部分架橋したもの等が挙げられる。これらの内、吸水量、吸水速度に優れるアクリル酸またはアクリル酸塩系のものが好適である。前記吸水性能を有する高吸水性樹脂は製造プロセスにおいて、架橋密度および架橋密度勾配を調整することにより吸水力と吸水速度の調整が可能である。前記高吸水性樹脂の含有率は吸収体重量の３〜６０％とするのが望ましい。高吸水性樹脂含有率が３％未満の場合には、十分な吸収能を与えることができず、６０％を超える場合にはパルプ繊維間の絡み合いが無くなり、シート強度が低下し破れや割れ等が発生し易くなる。   Examples of the superabsorbent resin include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process of the highly water-absorbent resin having the water absorption performance, the water absorption force and the water absorption speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient. The content of the highly water-absorbent resin is desirably 3 to 60% of the weight of the absorber. When the content of the superabsorbent resin is less than 3%, sufficient absorbability cannot be provided, and when it exceeds 60%, the entanglement between the pulp fibers disappears, the sheet strength decreases, and tears, cracks, etc. Is likely to occur.

〔吸収体４〕
以下、前記吸収体４について更に詳細に説明する。前記吸収体４は、図３に示されるように、一定方向の並列線と、これと交差する方向の並列線とからなる相対的に低い坪量で形成された低坪量部１０、１０…と、前記低坪量部１０によって区画された領域にブロック状に形成されるとともに相対的に高い坪量で形成された高坪量部１１、１１…とを有している。また、各高坪量部１１、１１…を通る連続する平面パターンで前記吸収体４が厚み方向に圧搾された凹溝１２、１２…が形成されている。 [Absorber 4]
Hereinafter, the absorber 4 will be described in more detail. As shown in FIG. 3, the absorbent body 4 is formed of low basis weight portions 10, 10,... Having a relatively low basis weight composed of parallel lines in a certain direction and parallel lines in a direction intersecting with the parallel lines. And a high basis weight portion 11 formed in a block shape in a region partitioned by the low basis weight portion 10 and formed with a relatively high basis weight. Moreover, the ditch | groove 12, 12, ... by which the said absorber 4 was squeezed in the thickness direction by the continuous plane pattern which passes each high basic weight part 11, 11, ... is formed.

前記低坪量部１０は、図４(A)に示されるように、吸収体４を構成するパルプや高吸水性樹脂などの吸収体構成材料が前記高坪量部１１に比べて相対的に低い坪量で配置された部分であり、吸収体４の平面方向に延びる連続線又は間欠線などの線状に形成されている。前記低坪量部１０は、前記吸収体構成材料が前記高坪量部１１に比べて相対的に低い密度で配置された部位である。   As shown in FIG. 4 (A), the low basis weight portion 10 is made of an absorbent body constituting material such as pulp and superabsorbent resin, which is relatively less than the high basis weight portion 11. It is a portion arranged with a low basis weight, and is formed in a line shape such as a continuous line or an intermittent line extending in the plane direction of the absorber 4. The said low basic weight part 10 is a site | part by which the said absorber constituent material is arrange | positioned by the relatively low density compared with the said high basic weight part 11. FIG.

図３に示される例では、前記低坪量部１０は、生理用ナプキン１の長手方向に沿って延びるとともに生理用ナプキン１の幅方向に間隔をあけて複数形成された長手方向の低坪量部１０と、生理用ナプキン１の幅方向に沿って延びるとともに生理用ナプキン１の長手方向に間隔をあけて複数形成された幅方向の低坪量部１０とからなる格子状に配置されている。前記格子状の低坪量部１０は、吸収体４の一方側の外縁から他方側の外縁までを貫く連続線又は間欠線によって構成されている。前記低坪量部１０は、長手方向の低坪量部と幅方向の低坪量部とが直交することにより、格子のマス目が略矩形状に形成されるようにするのが好ましい。   In the example shown in FIG. 3, the low basis weight portion 10 extends in the longitudinal direction of the sanitary napkin 1 and has a plurality of longitudinal low basis weights formed at intervals in the width direction of the sanitary napkin 1. It extends along the width direction of the sanitary napkin 1 and is arranged in a lattice shape including a plurality of low basis weight portions 10 in the width direction formed at intervals in the longitudinal direction of the sanitary napkin 1. . The lattice-shaped low basis weight portion 10 is configured by a continuous line or an intermittent line that penetrates from the outer edge on one side of the absorber 4 to the outer edge on the other side. It is preferable that the low basis weight part 10 is formed so that the grid squares are formed in a substantially rectangular shape when the low basis weight part in the longitudinal direction and the low basis weight part in the width direction are orthogonal to each other.

前記高坪量部１１は、図４(A)に示されるように、前記吸収体構成材料が前記低坪量部１０に比べて相対的に高い坪量で配置された部分であり、前記低坪量部１０によって格子状に区画された略矩形状の格子のマス目にブロック状に形成されている。前記高坪量部１１は、吸収体構成材料が前記低坪量部１０に比べて相対的に高い密度で配置された部位である。   As shown in FIG. 4 (A), the high basis weight portion 11 is a portion where the absorber constituting material is disposed at a relatively high basis weight as compared with the low basis weight portion 10. It is formed in a block shape in a grid of a substantially rectangular lattice partitioned by the basis weight portion 10 in a lattice shape. The high basis weight portion 11 is a portion where the absorber constituent material is disposed at a relatively higher density than the low basis weight portion 10.

前記高坪量部１１は、前記低坪量部１０が連続線で形成される場合、前記低坪量部１０によって囲まれた領域に独立して設けられ、隣り合うブロック状の高坪量部１１、１１同士の間には線状の低坪量部１０が存在するようになる。ただし、後段で詳述するように、前記低坪量部１０が間欠線で形成される場合、隣り合う高坪量部１１、１１同士の間に低坪量部１０の間欠部が存在するようになり、この間欠部が高坪量部とされることにより、隣り合う高坪量部１１、１１の一部が高坪量部で連続するようにしてもよい。   When the low basic weight portion 10 is formed of a continuous line, the high basic weight portion 11 is provided independently in a region surrounded by the low basic weight portion 10 and is adjacent to a block-shaped high basic weight portion. 11, the linear low basic weight part 10 comes to exist between each other. However, as described in detail later, when the low basis weight portion 10 is formed by an intermittent line, there is an intermittent portion of the low basis weight portion 10 between the adjacent high basis weight portions 11 and 11. Then, by making this intermittent portion a high basis weight portion, a part of the adjacent high basis weight portions 11 and 11 may be continuous at the high basis weight portion.

前記吸収体４は、前記高坪量部１１が低坪量部１０より厚い厚みで形成されるとともに、前記低坪量部１０が高坪量部１１の厚み方向の一方側に偏倚して配置されることにより、吸収体４の厚み方向の一方側面が平坦に形成され、他方側面が前記高坪量部１１で突出し、前記低坪量部１０で窪む凹凸状に形成されるようにするのが好ましい。このような凹凸面を設けることにより、前記低坪量部１０によって形成される凹部を通じても体液が拡散しやすくなる。   The absorbent body 4 is formed such that the high basis weight portion 11 is thicker than the low basis weight portion 10, and the low basis weight portion 10 is biased to one side in the thickness direction of the high basis weight portion 11. By doing so, one side surface in the thickness direction of the absorbent body 4 is formed flat, and the other side surface protrudes at the high basis weight portion 11 and is formed in an uneven shape recessed at the low basis weight portion 10. Is preferred. By providing such an uneven surface, body fluid easily diffuses through the recess formed by the low basis weight portion 10.

前記低坪量部１０及び高坪量部１１によって形成される凹凸面は、図２に示されるように、吸収体４の肌側面に設けられるようにしてもよいし、図９に示されるように、非肌側面に設けられるようにしてもよい。吸収体４の肌側面を前記凹凸面とすることにより、吸収体４に吸収される前の体液が、前記低坪量部１０によって形成される凹部に沿って平面方向に拡散するようになるため、体液の平面方向への拡散性がより向上するようになる。一方、吸収体４の非肌側面を前記凹凸面とすることにより、吸収体４を浸透した体液が吸収体４の非肌側で前記低坪量部１０に沿って平面方向に拡散するようになる。   The uneven surface formed by the low basis weight portion 10 and the high basis weight portion 11 may be provided on the skin side surface of the absorbent body 4 as shown in FIG. 2, or as shown in FIG. Alternatively, it may be provided on the non-skin side surface. By making the skin side surface of the absorbent body 4 the uneven surface, the body fluid before being absorbed by the absorbent body 4 is diffused in the plane direction along the concave portion formed by the low basis weight portion 10. The diffusibility of the body fluid in the planar direction is further improved. On the other hand, by making the non-skin side surface of the absorbent body 4 the uneven surface, the body fluid that has penetrated the absorbent body 4 diffuses in the plane direction along the low basis weight portion 10 on the non-skin side of the absorbent body 4. Become.

前記吸収体４を厚み方向に圧搾することにより形成される前記凹溝１２は、図４に示されるように、透液性表面シート３を配設する前の吸収体４のみを圧搾したもの又は吸収体４とこれを囲繞する被包シートとを一体的に圧搾したものである。前記凹溝１２は、図２及び図９に示されるように、吸収体４の肌側からの圧搾により形成したものでもよいし、図示しないが、吸収体４の非肌側からの圧搾により形成したものでもよい。前記凹溝１２は、透液性表面シート３及び吸収体４を一体的に圧搾していないため、前記凹溝１２を吸収体４の肌側からの圧搾により形成した場合、吸収体４の肌側面に透液性表面シート３を配設した状態で、前記凹溝１２において、透液性表面シート３と吸収体４との間に空間が形成され、この凹溝１２によって形成される透液性表面シート３と吸収体４との間の空間を通って体液が平面方向に拡散するようになる。   The groove 12 formed by squeezing the absorbent body 4 in the thickness direction is obtained by squeezing only the absorbent body 4 before the liquid-permeable surface sheet 3 is disposed, as shown in FIG. The absorbent body 4 and the encapsulating sheet surrounding it are squeezed together. As shown in FIGS. 2 and 9, the concave groove 12 may be formed by pressing the absorbent body 4 from the skin side, or not illustrated, but formed by pressing the absorbent body 4 from the non-skin side. You may have done. Since the concave groove 12 does not squeeze the liquid-permeable surface sheet 3 and the absorbent body 4 integrally, when the concave groove 12 is formed by pressing from the skin side of the absorbent body 4, the skin of the absorbent body 4. In a state where the liquid-permeable surface sheet 3 is disposed on the side surface, a space is formed between the liquid-permeable surface sheet 3 and the absorbent body 4 in the concave groove 12, and the liquid-permeable formed by the concave groove 12. The body fluid diffuses in the plane direction through the space between the conductive surface sheet 3 and the absorbent body 4.

前記凹溝１２は、全ての高坪量部１１、１１…を通る連続する平面パターンで形成されている。前記高坪量部１１は低坪量部１０で囲まれているため、前記凹溝１２は、高坪量部１１と、この高坪量部１１に隣接する低坪量部１０とを交互に通る連続する平面パターンで形成されている。また、前記凹溝１２は、吸収体４の一方側の外縁と他方側の外縁とを貫く複数の連続線状に形成されている。前記凹溝１２を連続線で形成することによって、体液が凹溝１２に沿って流れやすく、この凹溝１２を流れる過程で吸収体４に吸収されやすくなる。また、前記凹溝１２は、一定の方向にのみ延びるのではなく、中間に別の方向に延びる複数の接続部（交差部）が設けられている。これにより、凹溝１２に沿って流れる体液を複数の方向に分岐させることができ、平面方向への体液の拡散性が向上するようになる。   The concave groove 12 is formed in a continuous plane pattern that passes through all the high basis weight portions 11, 11. Since the high basis weight portion 11 is surrounded by the low basis weight portion 10, the groove 12 alternately includes the high basis weight portion 11 and the low basis weight portion 10 adjacent to the high basis weight portion 11. It is formed in a continuous plane pattern that passes through. Further, the concave groove 12 is formed in a plurality of continuous lines penetrating the outer edge on one side and the outer edge on the other side of the absorber 4. By forming the concave groove 12 with a continuous line, the body fluid easily flows along the concave groove 12 and is easily absorbed by the absorbent body 4 in the process of flowing through the concave groove 12. Further, the concave groove 12 does not extend only in a certain direction, but is provided with a plurality of connecting portions (intersections) extending in another direction in the middle. Thereby, the bodily fluid which flows along the concave groove 12 can be branched in a plurality of directions, and the diffusibility of the bodily fluid in the planar direction is improved.

前記凹溝１２は、図４(A)に示されるように、積繊などによって前記低坪量部１０及び高坪量部１１が形成された吸収体４に対して、同図４(B)に示されるように、肌側からの圧搾により所定の位置に形成される。これによって、吸収体４は、同図４(C)に示されるように、凹溝１２が窪んだ凹凸状に形成されるようになる。   As shown in FIG. 4 (A), the concave groove 12 has the same structure as the absorbent body 4 in which the low basis weight portion 10 and the high basis weight portion 11 are formed by stacking fibers. As shown in Fig. 2, it is formed at a predetermined position by squeezing from the skin side. As a result, the absorbent body 4 is formed in a concavo-convex shape in which the concave groove 12 is depressed, as shown in FIG.

前記凹溝１２は、図３に示されるように、閉合形状の単位図形１３、図示例ではナプキン長手方向に長い長方形が平面方向に複数連続して配置されたパターンで形成され、この単位図形１３が隣接する複数の高坪量部１１…に跨るように形成されるようにするのが好ましい。これにより、前記凹溝１２が、隣り合う少なくとも２つの高坪量部１１、１１及びこれらの間に存在する低坪量部１０に跨って配置されるため、前記凹溝１２によって低坪量部１０にコシを持たせることができ、外部からの圧力によって低坪量部１０が変形して高坪量部１１が移動することにより吸収体４がヨレるのが防止できるようになる。   As shown in FIG. 3, the concave groove 12 is formed in a closed unit graphic 13, in the illustrated example, a pattern in which a plurality of rectangles long in the napkin longitudinal direction are continuously arranged in the plane direction. Is preferably formed so as to straddle a plurality of adjacent high basis weight portions 11. Thereby, since the said ditch | groove 12 is arrange | positioned ranging over the at least 2 high basic weight parts 11 and 11 which adjoin, and the low basic weight part 10 which exists among these, the low basic weight part is set by the said ditch | groove 12. 10 can have a firmness, and the low basis weight portion 10 is deformed by the pressure from the outside and the high basis weight portion 11 is moved, thereby preventing the absorbent body 4 from being twisted.

図３に示される形態例では、前記凹溝１２は、格子状の低坪量部１０に対して各マス目（高坪量部１１）の中央を通るとともに、長手方向の低坪量部１０及び幅方向の低坪量部１０にそれぞれ平行するように、生理用ナプキン１の長手方向に沿って延び生理用ナプキン１の幅方向に間隔をあけた複数の長手方向の凹溝１２、１２…と、生理用ナプキン１の幅方向に沿って延び生理用ナプキン１の長手方向に間隔をあけた複数の幅方向の凹溝１２、１２…とからなる格子状に配置されている。すなわち、前記凹溝１２は、格子状の低坪量部１０と長手方向及び幅方向にそれぞれ同じピッチの格子状に形成されるとともに、凹溝１２の長手方向線及び幅方向線がそれぞれ、低坪量部１０の各マス目（高坪量部１１）の中央で交差するように配置されている。本形態例では、ナプキン長手方向に長い長方形からなる閉合形状の単位図形１３が生理用ナプキン１の長手方向及び幅方向に複数連続して配置され、前記単位図形１３が長手方向及び幅方向に隣接する４つの高坪量部１１、１１…に跨るように形成されている。   In the embodiment shown in FIG. 3, the groove 12 passes through the center of each grid (high basis weight portion 11) with respect to the lattice-shaped low basis weight portion 10, and the low basis weight portion 10 in the longitudinal direction. And a plurality of longitudinal grooves 12, 12 extending in the longitudinal direction of the sanitary napkin 1 and spaced in the width direction of the sanitary napkin 1 so as to be parallel to the low basis weight portion 10 in the width direction. And a plurality of concave grooves 12, 12... Extending in the width direction of the sanitary napkin 1 and spaced in the longitudinal direction of the sanitary napkin 1. That is, the groove 12 is formed in a lattice shape having the same pitch in the longitudinal direction and the width direction as the lattice-shaped low basis weight portion 10, and the longitudinal direction line and the width direction line of the recessed groove 12 are low. It arrange | positions so that it may cross | intersect in the center of each square (high basic weight part 11) of the basic weight part 10. FIG. In this embodiment, a plurality of closed unit figures 13 made of a rectangle long in the longitudinal direction of the napkin are continuously arranged in the longitudinal direction and the width direction of the sanitary napkin 1, and the unit figures 13 are adjacent in the longitudinal direction and the width direction. It is formed so as to straddle the four high basis weight parts 11, 11.

また、図７に示される形態では、前記凹溝１２は、格子状の低坪量部１０に対して各マス目（高坪量部１１）の対角同士を結ぶ対角線によって形成されるとともに、一方側の対角線と他方側の対角線とが各マス目の中央で交差するように形成されている。前記凹溝１２を低坪量部１０の各マス目の対角線で形成することにより、凹溝１２に沿って流れる体液が幅方向に直進することがなくなるため、体液の横漏れが防止できるようになる。本形態例では、ナプキン長手方向に長い菱形からなる閉合形状の単位図形１３が生理用ナプキン１の斜め方向に複数連続して配置され、前記単位図形１３が幅方向又は長手方向に隣接する２つの高坪量部１１、１１に跨るように形成されている。   Further, in the form shown in FIG. 7, the concave grooves 12 are formed by diagonal lines connecting the diagonals of the respective cells (high basis weight portions 11) with respect to the lattice-shaped low basis weight portions 10, The diagonal line on one side and the diagonal line on the other side are formed so as to intersect at the center of each square. By forming the concave groove 12 by diagonal lines of each square of the low basis weight portion 10, body fluid flowing along the concave groove 12 does not travel straight in the width direction, so that side leakage of body fluid can be prevented. Become. In this embodiment, a plurality of closed unit graphics 13 made of rhombus long in the napkin longitudinal direction are continuously arranged in the oblique direction of the sanitary napkin 1, and the unit graphics 13 are adjacent to each other in the width direction or the longitudinal direction. It is formed so as to straddle the high basis weight parts 11 and 11.

更に、図８に示される形態では、前記凹溝１２は、ナプキン長手方向に延びる低坪量部１０とナプキン幅方向に延びる低坪量部１０との交点を中心として、この交点から長手方向及び幅方向に隣接する次の交点までの中央部を通る円形又は楕円形の単位図形１３を、生理用ナプキン１の長手方向及び幅方向に複数連続させたパターンで形成されている。本形態例では、ナプキン長手方向に長い楕円形からなる閉合形状の単位図形１３が生理用ナプキン１の長手方向及び幅方向に隣接する４つの高坪量部１１、１１…に跨るように形成されている。このように、前記凹溝１２は、直線である必要はなく、弧状曲線で形成することも可能である。楕円形の凹溝１２を設けることにより、凹溝１２に沿って流れる体液が直進することがなく、凹溝１２に沿って円弧状に湾曲して流れるため、吸収体４に吸収されやすくなる。   Furthermore, in the form shown in FIG. 8, the concave groove 12 is centered on the intersection of the low basis weight portion 10 extending in the napkin longitudinal direction and the low basis weight portion 10 extending in the napkin width direction. A plurality of circular or elliptical unit figures 13 passing through the central part up to the next intersection adjacent in the width direction are formed in a pattern in which a plurality of the unit figures 13 are continuous in the longitudinal direction and the width direction of the sanitary napkin 1. In this embodiment, the closed unit graphic 13 made of an ellipse that is long in the longitudinal direction of the napkin is formed so as to straddle the four high basis weight portions 11, 11... Adjacent in the longitudinal direction and the width direction of the sanitary napkin 1. ing. Thus, the concave groove 12 does not have to be a straight line, and can be formed by an arcuate curve. By providing the oval concave groove 12, the body fluid flowing along the concave groove 12 does not go straight, but flows in a circular arc along the concave groove 12, so that it is easily absorbed by the absorber 4.

次いで前記低坪量部１０の形態例について説明すると、図３に示される例では、前記低坪量部１０は、連続線によって形成されているが、図５及び図６に示されるように、低坪量部と、この低坪量部の間欠部１４とが交互に繰り返し形成された間欠線からなるようにしてもよい。かかる間欠線で形成する場合、凹溝１２が通る部分に前記低坪量部１０の間欠部１４が位置し、かつ前記低坪量部１０の間欠部１４が前記低坪量部１０に比べて相対的に坪量が高い高坪量部１５とするのが好ましい。これにより、吸収体４に凹溝１２を設ける際の圧搾力が前記高坪量部１１及び前記間欠部１４の高坪量部１５においてほぼ均等に作用するため、凹溝１２を形成しやすくなるとともに、凹溝１２の形状が維持しやすくなる。このような観点から、前記間欠部１４の高坪量部１５は、前記低坪量部１０で囲まれた領域に形成される高坪量部１１とほぼ同等の坪量で形成するのが好ましい。これにより、隣り合う高坪量部１１、１１同士が前記間欠部１４の高坪量部１５で接続されるようになり、隣り合う高坪量部１１、１１の間の一部がほぼ同じ坪量の高坪量部１５で連続するようになる。前記間欠部１４の前記低坪量部１０が延びる方向に沿った長さ（低坪量部の離間長さ）としては、凹溝１２の加工時に圧搾力がほぼ均等に作用するように、この間欠部１４を通る凹溝１２の側縁から所定長さだけ離間する範囲まで形成するのが好ましく、凹溝１２の側縁から２〜８ｍｍ程度離間する位置まで設けるのが好ましい。前記凹溝１２が通る部分以外では、前記低坪量部１０は、体液の拡散性を確保するため、連続線で形成されている。   Next, an embodiment of the low basis weight portion 10 will be described. In the example shown in FIG. 3, the low basis weight portion 10 is formed by a continuous line, but as shown in FIGS. 5 and 6, You may make it consist of the intermittent line in which the low basic weight part and the intermittent part 14 of this low basic weight part were alternately repeated. When formed with such intermittent lines, the intermittent portion 14 of the low basis weight portion 10 is located in a portion through which the concave groove 12 passes, and the intermittent portion 14 of the low basis weight portion 10 is compared to the low basis weight portion 10. The high basis weight portion 15 having a relatively high basis weight is preferable. Thereby, since the pressing force at the time of providing the ditch | groove 12 in the absorber 4 acts substantially equally in the said high basic weight part 11 and the high basic weight part 15 of the said intermittent part 14, it becomes easy to form the ditch | groove 12. At the same time, the shape of the concave groove 12 is easily maintained. From such a viewpoint, the high basis weight portion 15 of the intermittent portion 14 is preferably formed with a basis weight substantially equal to the high basis weight portion 11 formed in the region surrounded by the low basis weight portion 10. . Thereby, adjacent high basic weight parts 11 and 11 come to be connected by the high basic weight part 15 of the said intermittent part 14, and a part between adjacent high basic weight parts 11 and 11 is substantially the same basic weight. It becomes continuous at the high basis weight portion 15 of the amount. As the length of the intermittent portion 14 along the direction in which the low basis weight portion 10 extends (the separation length of the low basis weight portion), the squeezing force acts substantially evenly when the concave groove 12 is processed. It is preferable to form up to a range separated by a predetermined length from the side edge of the groove 12 passing through the intermittent portion 14, and it is preferable to provide a position about 2 to 8 mm away from the side edge of the groove 12. Except for the portion through which the concave groove 12 passes, the low basis weight portion 10 is formed by a continuous line in order to ensure the diffusibility of body fluid.

以上の構成からなる本生理用ナプキン１では、透液性表面シート３を浸透した体液は、凹溝１２内を凹溝１２に沿って吸収体４の平面方向の広い範囲に拡散する過程で吸収体４に素早く吸収・保持されるようになる。このように、本生理用ナプキン１では、体液を凹溝１２に沿って平面方向に拡散させてから吸収するため、体液が一定の領域に集中して吸収されるのが防止でき、吸収体４に含まれる高吸水性樹脂によるゲルブロッキングが生じにくく、体液を効率的に吸収できるとともに、吸収した体液の逆戻りも防止できるようになる。前記凹溝１２を吸収体４の肌側からの圧搾により形成することにより、吸収体４に吸収される前の体液が前記凹溝１２内に流入し、この凹溝１２内を凹溝１２に沿って吸収体４の平面方向の広い範囲に拡散するようになる。   In the sanitary napkin 1 having the above-described configuration, the bodily fluid that has permeated the liquid-permeable surface sheet 3 is absorbed in the process of diffusing in the concave groove 12 along the concave groove 12 in a wide range in the planar direction of the absorbent body 4. It is quickly absorbed and held by the body 4. As described above, in the sanitary napkin 1, the body fluid is absorbed after being diffused in the planar direction along the concave groove 12, so that it is possible to prevent the body fluid from being concentrated and absorbed in a certain region. Gel-blocking due to the highly water-absorbent resin contained in is difficult to occur, so that the body fluid can be absorbed efficiently and the absorbed body fluid can be prevented from returning. By forming the concave groove 12 by squeezing from the skin side of the absorbent body 4, body fluid before being absorbed by the absorbent body 4 flows into the concave groove 12. It spreads over a wide range in the plane direction of the absorber 4 along the line.

また、吸収体４に吸収された体液は、前記低坪量部１０に浸透すると、この低坪量部１０に沿って平面方向に素早く拡散するとともに、前記低坪量部１０と高坪量部１１との繊維密度勾配によって、高坪量部１１に引き込まれるように移動するため、吸収体４の内部においても体液の拡散性に優れるようになる。   Moreover, when the bodily fluid absorbed by the absorbent body 4 penetrates into the low basis weight portion 10, it quickly diffuses in the plane direction along the low basis weight portion 10, and the low basis weight portion 10 and the high basis weight portion. The fiber density gradient with respect to 11 moves so as to be drawn into the high basis weight portion 11, so that the diffusibility of the body fluid is also improved inside the absorbent body 4.

更に、前記凹溝１２が前記吸収体４の各高坪量部１１、１１…を通るとともに、隣り合う高坪量部１１、１１の間に存在する低坪量部１０を通る平面パターンで形成されているため、前記低坪量部１０が設けられることによって低下した吸収体４のコシを補強することができるようになる。このため、装着時に、脚の付け根の内側部分によって幅方向両側から内側に向けて作用する脚圧や、身体の動きに伴う圧力などによって、低坪量部１０が変形しブロック状の高坪量部１１が移動する吸収体４のヨレが防止できるようになる。   Further, the groove 12 is formed in a planar pattern that passes through the high basis weight portions 11, 11... Of the absorber 4 and passes through the low basis weight portions 10 existing between the adjacent high basis weight portions 11, 11. Therefore, the stiffness of the absorbent body 4 that has been lowered by the provision of the low basis weight portion 10 can be reinforced. For this reason, at the time of wearing, the low basis weight part 10 is deformed due to leg pressure acting inward from both sides in the width direction by the inner part of the base of the leg, pressure due to body movement, etc. The deflection of the absorbent body 4 to which the part 11 moves can be prevented.

ところで、前記低坪量部１０及び高坪量部１１を備えた吸収体を作製するには、上記特許文献１、２（特開2012-130364号公報及び特開2013-66670号公報）に記載された方法を用いることができる。詳細は同公報に譲るとして、概略を説明すると以下の通りである。製造装置３０は、図１０に示されるように、外周面に複数の集積用凹部３１、３１…（堆積部）が所定の間隔で形成された回転ドラム３２と、回転ドラム３２の外周面に向けて繊維材料を飛散状態にて供給するダクト３３と、ダクト３３に繊維材料を供給する繊維材料供給部３４と、集積用凹部３１にあふれるように堆積させた過剰量の繊維材料を掻き取るスカッフィングロール３５と、集積用凹部３１から離型した堆積体（吸収体前駆体３６）の上下面を被包シートで被覆する被覆機構（図示せず）と、前記吸収体前駆体３６を被包シートで被覆して得られる吸収体連続体を、一対のプレスロール３７、３８間で加圧して圧縮する圧縮装置３９と、圧縮後の吸収体連続体を個々の生理用ナプキンに使用される寸法に切断する切断装置（図示せず）とを備えている。前記製造装置３０を用いて前記低坪量部１０及び高坪量部１１を備えた吸収体を製造する方法は、前記繊維材料供給部３４を作動させて繊維材料をダクト３３を通して回転ドラム３２の外周面に向けて供給すると、前記繊維材料が各集積用凹部３１に吸引されて堆積する。前記スカッフィングロール３５に掻き取られず集積用凹部３１内に残った堆積体（吸収体前駆体３６）は、被包シート上に離型される。前記吸収体前駆体３６の形成について図１１を参照して説明すると、図１１(A)に示す集積用凹部３１内部には、図１１(A)の突起部４０をより分けて繊維材料が積繊され、徐々に堆積すると、同図１１(B)に示されるように突起部４０の高さを超えて積繊されて、同図１１(C)に示される吸収体前駆体３６となる。前記突起部４０上に堆積した部分４１が吸収体４の低坪量部１０となり、突起部４０以外の集積用凹部３１に堆積した部分４２が圧縮される前の高坪量部１１となる。被包シート上の吸収体前駆体３６は、被包シートにより被覆された後、圧縮装置３９に導入されて一対のプレスロール３７、３８間で加圧される。これにより、集積用凹部３１に堆積した部分４２が圧縮されて高密度領域の高坪量部１１として成形される。   By the way, in order to produce the absorber provided with the said low basic weight part 10 and the high basic weight part 11, it describes in the said patent document 1, 2 (Unexamined-Japanese-Patent No. 2012-130364 and Unexamined-Japanese-Patent No. 2013-66670). Method can be used. The details will be given in the publication, and the outline will be described as follows. As shown in FIG. 10, the manufacturing apparatus 30 has a rotating drum 32 in which a plurality of accumulation recesses 31, 31... A duct 33 for supplying the fiber material in a scattered state, a fiber material supply unit 34 for supplying the fiber material to the duct 33, and a scuffing roll for scraping off an excessive amount of the fiber material deposited so as to overflow the recess 31 for accumulation. 35, a covering mechanism (not shown) for covering the upper and lower surfaces of the deposit (absorber precursor 36) released from the accumulation recess 31 with an encapsulating sheet, and the absorber precursor 36 with an encapsulating sheet The absorber continuous body obtained by coating is compressed between a pair of press rolls 37 and 38 and compressed, and the compressed absorber continuous body is cut to a size used for each sanitary napkin. Cutting device (shown) Not) and a. The method of manufacturing the absorbent body having the low basis weight portion 10 and the high basis weight portion 11 using the manufacturing apparatus 30 operates the fiber material supply portion 34 to pass the fiber material through the duct 33 of the rotary drum 32. When the fiber material is supplied toward the outer peripheral surface, the fiber material is sucked and accumulated in the respective concave portions 31 for accumulation. The deposit (absorber precursor 36) remaining in the accumulation recess 31 without being scraped off by the scuffing roll 35 is released on the encapsulating sheet. The formation of the absorber precursor 36 will be described with reference to FIG. 11. In the accumulation recess 31 shown in FIG. 11 (A), the protrusion 40 of FIG. When the fibers are finely deposited and gradually accumulated, they are piled over the height of the protrusions 40 as shown in FIG. 11 (B) to become the absorber precursor 36 shown in FIG. 11 (C). The portion 41 deposited on the protruding portion 40 becomes the low basis weight portion 10 of the absorbent body 4, and the portion 42 deposited on the accumulation recess 31 other than the protruding portion 40 becomes the high basis weight portion 11 before being compressed. After the absorber precursor 36 on the encapsulating sheet is coated with the encapsulating sheet, it is introduced into the compression device 39 and pressed between the pair of press rolls 37 and 38. As a result, the portion 42 deposited in the accumulation recess 31 is compressed and formed as the high basis weight portion 11 in the high density region.

また、前記低坪量部１０及び高坪量部１１の坪量及び各部の寸法はそれぞれ概ね上記特許文献２（特開2013-66670号公報）に記載されたものを採用することができる。具体的には、低坪量部１０の坪量は、１０〜１５０ｇ／ｍ２、好ましくは３０〜１００ｇ／ｍ２とするのがよく、高坪量部１１の坪量は、１００〜６００ｇ／ｍ２、好ましくは１５０〜５００ｇ／ｍ２とするのがよい。また、高坪量部１１の坪量と低坪量部１０の坪量との比は、１．２５〜１０、好ましくは３〜６とするのがよい。前記坪量の測定方法としては、特開2013-255572号公報の段落[0026]に記載される方法を用いることができる。具体的には、フェザー社製片刃剃刀を用いて前記低坪量部１０及び高坪量部１１のそれぞれの小片に切断し、各小片について重量を電子天秤(Ａ＆Ｄ社製電子天秤ＦＸ−３００、精度：小数点以下３桁）を用いて測定する。求めた重量を各小片の面積で除して小片の坪量を算出する。低坪量部１０及び高坪量部１１についてそれぞれ小片５個の坪量の平均を坪量とする。 Moreover, the basic weight of the said low basic weight part 10 and the high basic weight part 11 and the dimension of each part can respectively employ | adopt substantially what was described in the said patent document 2 (Unexamined-Japanese-Patent No. 2013-66670). Specifically, the basis weight of the low basis weight portion 10 is 10 to 150 g / m 2 , preferably 30 to 100 g / m 2, and the basis weight of the high basis weight portion 11 is 100 to 600 g / m 2. m 2 , preferably 150 to 500 g / m 2 . Moreover, the ratio of the basic weight of the high basic weight part 11 and the basic weight of the low basic weight part 10 is set to 1.25-10, Preferably it is 3-6. As a method for measuring the basis weight, the method described in paragraph [0026] of JP-A-2013-255572 can be used. Specifically, it cuts into each small piece of the said low basic weight part 10 and the high basic weight part 11 using the single blade razor by a feather company, and weighs each small piece with an electronic balance (Electronic balance FX-300 by A & D company). , Accuracy: 3 digits after the decimal point). Divide the determined weight by the area of each piece to calculate the basis weight of the piece. For the low basis weight portion 10 and the high basis weight portion 11, the average of the basis weights of 5 pieces each is the basis weight.

図４(A)に示されるように、高坪量部１１の厚みＴ１と低坪量部１０の厚みＴ０との比（Ｔ１／Ｔ０）は、１〜２０、好ましくは１．５〜１０とするのがよい。   As shown in FIG. 4 (A), the ratio (T1 / T0) between the thickness T1 of the high basis weight portion 11 and the thickness T0 of the low basis weight portion 10 is 1 to 20, preferably 1.5 to 10. It is good to do.

低坪量部１０の厚みＴ０は、０．１〜５ｍｍ、好ましくは０．２〜３ｍｍとするのがよい。また高坪量部１１の厚みＴ１は、０．５〜１５ｍｍ、好ましくは１〜１０ｍｍとするのがよい。前記厚みの測定方法としては、特開2013-255572号公報の段落[0027]に記載される方法を用いることができる。具体的には、所定のサイズにサンプルをカットし、５ｋＰａで測定部位を１０分間加圧し、除重後すぐに測定を行う。測定箇所は、１枚当たり３点以上とし、サンプル２枚の平均で厚みを求める。詳しくは、吸収体４をフェザー社製片刃剃刀を用いて生理用ナプキン１の長手方向又は幅方向に沿って切断し、この切断されたサンプルの断面を測定する。肉眼にて測定し難い場合には、前記切断されたサンプルの断面を、例えば、マイクロスコープ（ＫＥＹＥＮＣＥ社製ＶＨＸ−５０００）を用いて２０〜１００倍の倍率で観察し、測定してもよい。   The thickness T0 of the low basis weight portion 10 is 0.1 to 5 mm, preferably 0.2 to 3 mm. Moreover, thickness T1 of the high basic weight part 11 is 0.5-15 mm, Preferably it is 1-10 mm. As a method for measuring the thickness, the method described in paragraph [0027] of JP-A-2013-255572 can be used. Specifically, the sample is cut to a predetermined size, the measurement site is pressurized at 5 kPa for 10 minutes, and the measurement is performed immediately after dewetting. The number of measurement points is 3 or more per sheet, and the thickness is obtained by averaging two samples. Specifically, the absorbent body 4 is cut along the longitudinal direction or the width direction of the sanitary napkin 1 using a feather blade manufactured by Feather, and the cross section of the cut sample is measured. When it is difficult to measure with the naked eye, the cross section of the cut sample may be observed and measured at a magnification of 20 to 100 times using, for example, a microscope (VHX-5000 manufactured by KEYENCE).

低坪量部１０の幅Ｌ０は、０．５〜７．５ｍｍｍ好ましくは１〜５ｍｍとするのがよい。生理用ナプキン１の長手方向に沿う低坪量部１０と生理用ナプキン１の幅方向に沿う低坪量部１０とは、同じ幅で形成してもよいし、異なる幅で形成してもよい。   The width L0 of the low basis weight portion 10 is 0.5 to 7.5 mm, preferably 1 to 5 mm. The low basis weight portion 10 along the longitudinal direction of the sanitary napkin 1 and the low basis weight portion 10 along the width direction of the sanitary napkin 1 may be formed with the same width or different widths. .

高坪量部１１の大きさは、生理用ナプキン１の長手方向の長さが５〜５０ｍｍ、好ましくは１０〜３０ｍｍとするのがよく、生理用ナプキン１の幅方向の長さが３〜３０ｍｍ、好ましくは５〜２０ｍｍとするのがよい。前記高坪量部１１は、面積５０ｃｍ２当たり、５〜７０個、特に１０〜６０個形成されていることが好ましい。 The size of the high basis weight portion 11 is such that the length in the longitudinal direction of the sanitary napkin 1 is 5 to 50 mm, preferably 10 to 30 mm, and the length in the width direction of the sanitary napkin 1 is 3 to 30 mm. The thickness is preferably 5 to 20 mm. It is preferable that 5 to 70, particularly 10 to 60, of the high basis weight portions 11 are formed per 50 cm 2 area.

次いで、前記凹溝１２の寸法について説明すると、前記凹溝１２の幅は、凹溝１２に沿って体液を拡散しやすくするとともに、吸収体４に適度なコシを与えるため、０．５〜８ｍｍ、好ましくは１〜５ｍｍとするのがよい。   Next, the dimensions of the concave groove 12 will be described. The width of the concave groove 12 is 0.5 to 8 mm in order to facilitate diffusion of body fluid along the concave groove 12 and give the absorbent body 4 an appropriate stiffness. The thickness is preferably 1 to 5 mm.

また、前記凹溝１２の深さは、前記高坪量部１１と低坪量部１０との厚み差（Ｔ１−Ｔ０）より大きくするのが好ましい。これにより低坪量部１０にも凹溝１２のエンボスを確実に入れることができるようになる。   Moreover, it is preferable that the depth of the concave groove 12 is larger than the thickness difference (T1-T0) between the high basis weight portion 11 and the low basis weight portion 10. As a result, the embossment of the concave groove 12 can be reliably put into the low basis weight portion 10 as well.

前記低坪量部１０及び高坪量部１１が形成された吸収体４に前記凹溝１２を施すには、前記吸収体４を、前記凹溝１２に対応する凸部が形成されたエンボスロールと、表面が平坦なアンビルロールとの間を通過させることにより成すことができる。   In order to apply the concave groove 12 to the absorbent body 4 in which the low basic weight part 10 and the high basic weight part 11 are formed, the absorbent body 4 is embossed roll in which convex parts corresponding to the concave groove 12 are formed. And an anvil roll having a flat surface.

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、１０…低坪量部、１１…高坪量部、１２…凹溝、１３…単位図形、１４…間欠部、１５…間欠部の高坪量部   DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid impervious back sheet, 3 ... Liquid permeable top sheet, 4 ... Absorber, 10 ... Low basic weight part, 11 ... High basic weight part, 12 ... Groove, 13 ... Unit Figure, 14 ... intermittent part, 15 ... high basis weight part of intermittent part

Claims (4)

少なくとも吸収体を備えた吸収性物品であって、
前記吸収体は、一定方向の並列線と、これと交差する方向の並列線とからなる相対的に低い坪量で形成された低坪量部と、前記低坪量部によって区画された領域にブロック状に形成されるとともに相対的に高い坪量で形成された高坪量部とを有し、かつ各高坪量部を通る連続する平面パターンで前記吸収体が厚み方向に圧搾された凹溝が形成され、
前記低坪量部は、吸収性物品の長手方向に沿って延びるとともに吸収性物品の幅方向に間隔をあけて複数形成され、かつ吸収性物品の幅方向に沿って延びるとともに吸収性物品の長手方向に間隔をあけて複数形成された格子状に配置され、
前記凹溝は、格子状の前記低坪量部と長手方向及び幅方向にそれぞれ同じピッチの格子状に形成されるとともに、該凹溝の長手方向線及び幅方向線がそれぞれ前記高坪量部の中央で交差するように配置されていることを特徴とする吸収性物品。 An absorbent article comprising at least an absorbent,
The absorbent body has a low basis weight portion formed with a relatively low basis weight composed of a parallel line in a certain direction and a parallel line in a direction intersecting with the parallel line, and an area partitioned by the low basis weight portion. A concave formed in a block shape and having a high basis weight portion formed with a relatively high basis weight, and the absorbent body squeezed in the thickness direction in a continuous plane pattern passing through each high basis weight portion Grooves are formed,
The low basis weight portion extends along the longitudinal direction of the absorbent article and is formed in plural at intervals in the width direction of the absorbent article, and extends along the width direction of the absorbent article and extends along the longitudinal direction of the absorbent article. Arranged in a grid formed with multiple gaps in the direction,
The groove is formed in a lattice shape having the same pitch in the longitudinal direction and the width direction as the lattice-shaped low basis weight portion, and the longitudinal line and the width direction line of the groove are respectively the high basis weight portion. An absorbent article characterized by being arranged so as to intersect at the center . 前記凹溝は、閉合形状の単位図形が平面方向に複数連続して配置されたパターンで形成され、前記単位図形が隣接する複数の前記高坪量部に跨るように形成されている請求項１記載の吸収性物品。   The concave groove is formed in a pattern in which a plurality of closed unit graphics are continuously arranged in a plane direction, and the unit graphics are formed so as to straddle a plurality of adjacent high basis weight portions. The absorbent article as described. 前記単位図形が矩形、菱形、円形又は楕円形によって形成されている請求項２記載の吸収性物品。   The absorptive article according to claim 2 in which said unit figure is formed by rectangle, rhombus, circle, or ellipse. 前記低坪量部が間欠線からなるとともに、前記凹溝が通る部分に前記低坪量部の間欠部が位置し、かつ前記低坪量部の間欠部が相対的に坪量が高い高坪量部とされている請求項１〜３いずれかに記載の吸収性物品。   The low basis weight portion is composed of an intermittent line, the intermittent portion of the low basis weight portion is located in a portion where the groove passes, and the intermittent portion of the low basis weight portion has a relatively high basis weight. The absorbent article according to any one of claims 1 to 3, wherein the absorbent article is an amount.
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