JP6763051B2 - Absorbent article - Google Patents

Absorbent article Download PDF

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JP6763051B2
JP6763051B2 JP2019059325A JP2019059325A JP6763051B2 JP 6763051 B2 JP6763051 B2 JP 6763051B2 JP 2019059325 A JP2019059325 A JP 2019059325A JP 2019059325 A JP2019059325 A JP 2019059325A JP 6763051 B2 JP6763051 B2 JP 6763051B2
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fiber
absorbent
absorber
mass
water
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JP2020096779A (en
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裕美 立川
裕美 立川
将也 金子
将也 金子
糸井 奈美江
奈美江 糸井
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Kao Corp
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Kao Corp
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Priority to CN201980032633.1A priority patent/CN112135593B/en
Priority to PCT/JP2019/048621 priority patent/WO2020122161A1/en
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  • Absorbent Articles And Supports Therefor (AREA)
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Description

本発明は、吸収性物品に関する。 The present invention relates to an absorbent article.

使い捨ておむつ、生理用ナプキン等の吸収性物品は、一般に、相対的に着用者の肌から近い位置に配される表面シートと、相対的に着用者の肌から遠い位置に配される裏面シートと、両シート間に介在する吸収体とを含んで構成される。この吸収体は、典型的には、木材パルプ等の吸水性繊維を主体とし、更に吸水性ポリマー粒子を含んで構成される場合が多い。吸収性物品に使用される吸収体については、柔軟性、クッション性、圧縮回復性、保形性などの諸特性の向上が大きな課題である。 Absorbent articles such as disposable diapers and sanitary napkins generally include a front sheet that is placed relatively close to the wearer's skin and a back sheet that is placed relatively far from the wearer's skin. , Consists of an absorber intervening between both sheets. This absorber is typically composed mainly of water-absorbent fibers such as wood pulp and further contains water-absorbent polymer particles. For an absorber used in an absorbent article, improvement of various properties such as flexibility, cushioning property, compression recovery property, and shape retention property is a major issue.

吸収体の改良技術として、例えば特許文献1には、熱可塑性樹脂繊維とセルロース系吸水性繊維とを含有する吸収体であって、該熱可塑性樹脂繊維が、該吸収体の表面シート側の表面と該吸収体の裏面シート側の表面との両方に露出しているものが記載されている。特許文献1記載の吸収体によれば、熱可塑性樹脂繊維が、セルロース系吸水性繊維などの該吸収体の他の成分を保持するための骨格として機能するため、柔らかく且つヨレにくいとされている。 As a technique for improving the absorber, for example, Patent Document 1 describes an absorber containing a thermoplastic resin fiber and a cellulosic water-absorbent fiber, and the thermoplastic resin fiber is the surface of the absorber on the surface sheet side. And those exposed on both the front surface of the absorber on the back sheet side are described. According to the absorber described in Patent Document 1, the thermoplastic resin fiber functions as a skeleton for holding other components of the absorber such as a cellulosic water-absorbent fiber, and is therefore soft and hard to twist. ..

特許文献2には、熱融着繊維を含み、予め繊維間を結合させて3次元構造を付与した不織布片と、吸水性繊維とを含有する吸収体が記載されており、該不織布片は吸収体全体に均一に分布している。この3次元構造の不織布片は、カッターミル方式などの粉砕手段を用いて不織布を細片状に粉砕して製造されるもので、斯かる製造方法に起因して、同文献の図1及び図3に記載されているように不定形状をなしていて、平面とみなせるような部分を実質的に有していない。特許文献2には、同文献記載の吸収体の好ましい形態として、不織布片同士を熱融着させたものが記載されている。特許文献2記載の吸収体によれば、不織布片が三次元構造を有するため、該吸収体内部に空隙が形成され、水分を吸収した時の復元性が向上し、その結果、吸水性能が向上するとされている。 Patent Document 2 describes an absorber containing heat-sealing fibers and preliminarily bonding the fibers to give a three-dimensional structure, and an absorber containing water-absorbent fibers, and the non-woven fabric piece absorbs. It is evenly distributed throughout the body. This non-woven fabric piece having a three-dimensional structure is manufactured by crushing the non-woven fabric into small pieces using a crushing means such as a cutter mill method, and due to such a manufacturing method, FIGS. 1 and 1 of the same document. As described in No. 3, it has an indefinite shape and does not substantially have a portion that can be regarded as a flat surface. Patent Document 2 describes a preferred form of the absorber described in the same document in which non-woven fabric pieces are heat-sealed together. According to the absorber described in Patent Document 2, since the non-woven fabric piece has a three-dimensional structure, voids are formed inside the absorber, and the resilience when absorbing water is improved, and as a result, the water absorption performance is improved. It is said that.

特許文献3及び4には、吸収体とは別体のクッション性に優れる部材を具備する吸収性物品が記載されている。特許文献3記載の吸収性物品においては、吸収体の上部、下部、又は内部に、弾力性を有するフィルム、繊維集合体に凹凸加工を施したシートなどからなるクッション材が配されている。特許文献4記載の吸収性物品においては、表面シートと吸収体との間に、不織布の細片の集合体で構成されたクッション層が配されている。 Patent Documents 3 and 4 describe an absorbent article having a member having excellent cushioning properties, which is different from the absorbent body. In the absorbent article described in Patent Document 3, a cushioning material made of an elastic film, a sheet in which a fiber aggregate is subjected to uneven processing, or the like is arranged in the upper part, the lower part, or the inside of the absorber. In the absorbent article described in Patent Document 4, a cushion layer composed of an aggregate of non-woven fabric fragments is arranged between the surface sheet and the absorber.

特開2015−16296号公報Japanese Unexamined Patent Publication No. 2015-16296 特開2002−301105号公報JP-A-2002-301105 特開2000−316902号公報Japanese Unexamined Patent Publication No. 2000-316902 特開2003−52750号公報Japanese Unexamined Patent Publication No. 2003-52750

吸収性物品の着用感を高めるためには、吸収性物品が具備する吸収体のクッション性を高めることが有効であり、そのためには、特許文献1に記載されているような、構成繊維が個々独立に存在している吸収体よりも、特許文献2に記載の不織布片の如き、繊維塊を含有する吸収体を使用した方が効果的である。また、特許文献3及び4に記載されているように、吸収体とは別にクッション性に優れる部材を併用することも、吸収性物品の着用感の向上には有効である。しかしながら、これらの従来技術を用いて吸収体のクッション性を高めても、吸収体が吸収性物品の着用時に加えられる体圧などの外力に対してヨレやすいものであると、吸収性物品の着用感の向上には繋がらない。また、吸収体には一定レベル以上の吸液性を備えていることが要求されるが、例えば単に、吸収体に特許文献2に記載の不織布片を含有させただけでは吸液性の低下を招くおそれがある。また例えば、特許文献3及び4に記載の如きクッション性に優れる部材を表面シートと吸収体との間に配置すれば、表面シートと吸収体との離間距離が長くなって液引き込み性が低下し、やはり吸液性の低下を招くおそれがある。吸収性物品の着用中にヨレ難く、クッション性及び液引き込み性に優れる吸収体は未だ提供されていない。 In order to enhance the wearing feeling of the absorbent article, it is effective to enhance the cushioning property of the absorber contained in the absorbent article, and for that purpose, the constituent fibers as described in Patent Document 1 are individually provided. It is more effective to use an absorber containing a fiber mass, such as the non-woven fabric piece described in Patent Document 2, than an absorber that exists independently. Further, as described in Patent Documents 3 and 4, it is also effective to use a member having excellent cushioning property in combination with the absorbent body in order to improve the wearing feeling of the absorbent article. However, even if the cushioning property of the absorber is enhanced by using these conventional techniques, if the absorber is easily twisted by an external force such as body pressure applied when the absorbent article is worn, the absorbent article is worn. It does not improve the feeling. Further, the absorber is required to have a liquid absorption property of a certain level or higher. For example, simply adding the non-woven fabric piece described in Patent Document 2 to the absorber reduces the liquid absorption property. There is a risk of inviting. Further, for example, if a member having excellent cushioning properties as described in Patent Documents 3 and 4 is arranged between the surface sheet and the absorber, the separation distance between the surface sheet and the absorber becomes long and the liquid drawing property is lowered. However, it may also cause a decrease in liquid absorption. An absorber that is resistant to twisting while wearing an absorbent article and has excellent cushioning and liquid drawability has not yet been provided.

したがって本発明の課題は、排泄前後での着用感が良好で、吸収性能に優れた吸収性物品を提供することに関する。 Therefore, an object of the present invention is to provide an absorbent article having a good wearing feeling before and after excretion and excellent absorption performance.

本発明は、使用者の前後方向に対応する縦方向とこれに直交する横方向とを有し、且つ使用時に使用者の排泄部に対向配置される排泄部対向領域と、該排泄部対向領域よりも縦方向前側に配される前方領域と、該排泄部対向領域よりも縦方向後側に配される後方領域とを有し、吸収体を備えた吸収性物品であって、前記吸収体は、合成繊維を含む繊維塊と、吸水性繊維とを含有し、前記吸収体において、前記繊維塊及び前記吸水性繊維の合計含有質量に対する該繊維塊の含有質量の比率は、前記前方領域及び前記後方領域よりも前記排泄部対向領域の方が大きく、且つ該排泄部対向領域では、該吸収体の非肌対向面側よりも該吸収体の肌対向面側の方が小さい吸収性物品である。 The present invention has a vertical direction corresponding to the front-back direction of the user and a horizontal direction orthogonal to the vertical direction, and is arranged to face the excretion part of the user at the time of use. An absorbent article having an anterior region arranged on the front side in the longitudinal direction and a rear region arranged on the posterior side in the longitudinal direction with respect to the excretion portion facing region, and having an absorber. Contains a fiber mass containing synthetic fibers and a water-absorbent fiber, and in the absorber, the ratio of the content mass of the fiber mass to the total content mass of the fiber mass and the water-absorbent fiber is the front region and An absorbent article in which the excretion portion facing region is larger than the rear region, and in the excretion portion facing region, the skin facing surface side of the absorber is smaller than the non-skin facing surface side of the absorber. is there.

本発明の吸収性物品は、排泄前後での着用感及び吸収性能に優れる。 The absorbent article of the present invention is excellent in wearing feeling and absorption performance before and after excretion.

図1は、本発明の吸収性物品の一実施形態である生理用ナプキンの肌対向面側(表面シート側)を一部破断して模式的に示す平面図である。FIG. 1 is a plan view schematically showing a sanitary napkin according to an embodiment of the absorbent article of the present invention, with the skin facing surface side (surface sheet side) partially broken. 図2は、図1のI−I線断面を模式的に示す横断面図である。FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. 図3は、図1に示す吸収性物品が具備する吸収体の肌対向面側を模式的に示す平面図である。FIG. 3 is a plan view schematically showing the skin-facing surface side of the absorber included in the absorbent article shown in FIG. 図4(a)は、図3のII−II線断面を模式的に示す横断面図、図4(b)は、図3のIII−III線断面を模式的に示す横断面図である。FIG. 4A is a cross-sectional view schematically showing a cross section taken along line II-II of FIG. 3, and FIG. 4B is a cross-sectional view schematically showing a cross section taken along line III-III of FIG. 図5は、図3のIV−IV線断面を模式的に示す縦断面図である。FIG. 5 is a vertical sectional view schematically showing a sectional view taken along line IV-IV of FIG. 図6(a)及び図6(b)はそれぞれ、本発明で用いる繊維塊の模式的な斜視図である。6 (a) and 6 (b) are schematic perspective views of the fiber mass used in the present invention, respectively. 図7は、本発明で用いる繊維塊の製造方法の説明図である。FIG. 7 is an explanatory diagram of a method for producing a fiber mass used in the present invention.

以下、本発明の吸収性物品をその好ましい実施形態に基づき図面を参照しながら説明する。図1及び図2には、本発明の吸収性物品の一実施形態である生理用ナプキン1が示されている。ナプキン1は、体液を吸収保持する吸収体4と、該吸収体4の肌対向面側に配され、着用者の肌と接触し得る液透過性の表面シート2と、該吸収体4の非肌対向面側に配された液難透過性の裏面シート3とを具備する。ナプキン1は、図1に示すように、着用者の前後方向に対応し、着用者の腹側から股間部を介して背側に延びる縦方向Xと、これに直交する横方向Yとを有し、且つ縦方向Xにおいて、着用時に着用者の外陰部などの排泄部に対向配置される排泄部対向部(排泄ポイント)を含む排泄部対向領域Bと、該排泄部対向領域Bよりも縦方向前側(着用者の腹側)に配される前方領域Aと、該排泄部対向領域Bよりも縦方向後側(着用者の背側)に配される後方領域Cとを有し、その3つに区分される。 Hereinafter, the absorbent article of the present invention will be described based on its preferred embodiment with reference to the drawings. 1 and 2 show a sanitary napkin 1, which is an embodiment of the absorbent article of the present invention. The napkin 1 has an absorber 4 that absorbs and retains body fluid, a liquid-permeable surface sheet 2 that is arranged on the skin-facing surface side of the absorber 4 and can come into contact with the wearer's skin, and a non-absorbent 4. It is provided with a liquid-impermeable back sheet 3 arranged on the side facing the skin. As shown in FIG. 1, the napkin 1 has a longitudinal direction X extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction Y orthogonal to the longitudinal direction X corresponding to the front-back direction of the wearer. In addition, in the vertical direction X, the excretion part facing area B including the excretion part facing part (excretion point) arranged to face the excretion part such as the wearer's dorsum when worn, and the excretion part facing area B vertically. It has an anterior region A arranged on the anterior side (ventral side of the wearer) and a posterior region C arranged on the posterior side (dorsal side of the wearer) in the longitudinal direction with respect to the excretion portion facing region B. It is divided into three categories.

本明細書において、「肌対向面」は、吸収性物品又はその構成部材(例えば吸収体4)における、吸収性物品の着用時に着用者の肌側に向けられる面、すなわち相対的に着用者の肌に近い側であり、「非肌対向面」は、吸収性物品又はその構成部材における、吸収性物品の着用時に肌側とは反対側、すなわち相対的に着用者の肌から遠い側に向けられる面である。なお、ここでいう「着用時」は、通常の適正な着用位置、すなわち当該吸収性物品の正しい着用位置が維持された状態を意味する。 In the present specification, the "skin facing surface" is a surface of the absorbent article or its constituent members (for example, the absorber 4) that is directed toward the skin side of the wearer when the absorbent article is worn, that is, relatively of the wearer. The side closer to the skin, the "non-skin facing surface" is the side of the absorbent article or its constituents that is opposite to the skin side when the absorbent article is worn, that is, toward the side relatively far from the wearer's skin. It is the surface to be. The term "when worn" as used herein means a state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained.

ナプキン1は、図1に示すように、縦方向Xに長い形状の吸収性本体5と、吸収性本体5における排泄部対向領域Bの縦方向Xに沿う両側部それぞれから横方向Yの外方に延出する一対のウイング部5W,5Wとを有している。吸収性本体5は、ナプキン1の主体をなす部分であり、前記の表面シート2、裏面シート3及び吸収体4を具備し、縦方向Xにおいて前方領域A、排泄部対向領域B及び後方領域Cの3つに区分される。 As shown in FIG. 1, the napkin 1 has an absorbent body 5 having a shape long in the vertical direction X and both sides of the excretory portion facing region B in the absorbent body 5 along the vertical direction X outward in the horizontal direction Y. It has a pair of wing portions 5W and 5W extending to. The absorbent body 5 is a portion that is the main body of the napkin 1, includes the front surface sheet 2, the back surface sheet 3, and the absorber 4, and in the vertical direction X, the front region A, the excretion portion facing region B, and the rear region C. It is divided into three categories.

本発明の吸収性物品における排泄部対向領域は、ナプキン1のように吸収性物品がウイング部を有する場合には、該吸収性物品の縦方向(長手方向、図中のX方向)においてウイング部を有する領域である。ナプキン1を例にとれば、一対のウイング部5W,5Wそれぞれの縦方向Xの前方側の付け根を通って横方向Yに延びる仮想直線と、一対のウイング部5W,5Wそれぞれの後方側の付け根を通って横方向Yに延びる仮想直線とに挟まれた領域が、排泄部対向領域Bである。なお、ナプキン1においては、一対のウイング部5W,5Wは、ナプキン1を横方向Yに二分して縦方向Xに延びる縦中心線を基準として左右対称に形成されており、一方のウイング部5Wの前記前方側の付け根と他方のウイング部5Wのそれとは、縦方向Xにおいて同位置に存する。 When the absorbent article has a wing portion like the napkin 1, the excretion portion facing region in the absorbent article of the present invention has a wing portion in the vertical direction (longitudinal direction, X direction in the drawing) of the absorbent article. It is an area having. Taking the napkin 1 as an example, a virtual straight line extending in the horizontal direction Y through the front roots of the vertical X of each of the pair of wing portions 5W and 5W, and the rear roots of the pair of wing portions 5W and 5W respectively. The region sandwiched between the virtual straight line extending in the lateral direction Y through the excretion portion is the excretion portion facing region B. In the napkin 1, the pair of wing portions 5W and 5W are formed symmetrically with respect to the vertical center line extending in the vertical direction X by dividing the napkin 1 into two in the horizontal direction Y, and one wing portion 5W. The base of the front side of the above and that of the other wing portion 5W are at the same position in the vertical direction X.

また、ウイング部を有しない吸収性物品(例えば使い捨ておむつ)における排泄部対向領域は、該吸収性物品を縦方向Xに三等分した際に、中間に位置する領域に相当する。 Further, the area facing the excretion part of the absorbent article having no wing portion (for example, a disposable diaper) corresponds to a region located in the middle when the absorbent article is divided into three equal parts in the vertical direction X.

図2に示すように、表面シート2は、吸収体4の肌対向面の全域を被覆している。一方、裏面シート3は、吸収体4の非肌対向面の全域を被覆し、更に吸収体4の縦方向Xに沿う両側縁から横方向Yの外方に延出し、後述するサイドシート6とともにサイドフラップ部を形成している。前記サイドフラップ部は、ナプキン1における、吸収体4から横方向Yの外方に延出する部材からなる部分である。裏面シート3とサイドシート6とは、吸収体4の縦方向Xに沿う両側縁からの延出部において、接着剤、ヒートシール、超音波シール等の公知の接合手段によって互いに接合されている。表面シート2及び裏面シート3それぞれと吸収体4との間は接着剤によって接合されていてもよい。表面シート2、裏面シート3としては、生理用ナプキン等の吸収性物品に従来使用されている各種のものを特に制限なく用いることができる。例えば、表面シート2としては、単層又は多層構造の不織布や、開孔フィルム等を用いることができる。裏面シート3としては、透湿性の樹脂フィルム等を用いることができる。 As shown in FIG. 2, the surface sheet 2 covers the entire surface of the absorber 4 facing the skin. On the other hand, the back surface sheet 3 covers the entire non-skin facing surface of the absorber 4, and further extends outward from both side edges along the vertical direction X of the absorber 4 in the horizontal direction Y, together with the side sheet 6 described later. A side flap portion is formed. The side flap portion is a portion of the napkin 1 made of a member extending outward in the lateral direction Y from the absorber 4. The back surface sheet 3 and the side sheet 6 are bonded to each other by known bonding means such as an adhesive, a heat seal, and an ultrasonic seal at the extending portions from both side edges of the absorber 4 along the vertical direction X. Each of the front surface sheet 2 and the back surface sheet 3 and the absorber 4 may be bonded by an adhesive. As the front surface sheet 2 and the back surface sheet 3, various types conventionally used for absorbent articles such as sanitary napkins can be used without particular limitation. For example, as the surface sheet 2, a non-woven fabric having a single-layer or multi-layer structure, a perforated film, or the like can be used. As the back sheet 3, a moisture-permeable resin film or the like can be used.

前記サイドフラップ部は、図1に示すように、排泄部対向領域Bにおいて横方向Yの外方に向かって大きく張り出しており、これにより吸収性本体5の縦方向Xに沿う左右両側に、一対のウイング部5W,5Wが延設されている。ウイング部5Wは、図1に示す如き平面視において、下底(上底よりも長い辺)が吸収性本体5の側部側に位置する略台形形状を有しており、その非肌対向面には、該ウイング部5Wをショーツ等の着衣に固定するウイング部粘着部(図示せず)が形成されている。ウイング部5Wは、ショーツ等の着衣のクロッチ部の非肌対向面(外面)側に折り返されて用いられる。なお、ウイング部5Wは、ショーツ等の着衣のクロッチ部の非肌対向面(外面)側に折り返されて用いられるため、前記ウイング部粘着部の形成面であるウイング部5Wの非肌対向面は、その使用時には着用者の肌側に向けられ、肌対向面となる。前記ウイング部粘着部は、その使用前においてはフィルム、不織布、紙等からなる剥離シート(図示せず)によって被覆されている。また、吸収性本体5の肌対向面すなわち表面シート2の肌対向面における縦方向Xに沿う両側部には、平面視において吸収体4の縦方向Xに沿う左右両側部に重なるように、一対のサイドシート6,6が吸収性本体5の縦方向Xの略全長に亘って配されている。一対のサイドシート6,6は、それぞれ縦方向Xに延びる図示しない接合線にて、接着剤や熱エンボス等の公知の接合手段によって表面シート2や他の部材に接合されている。 As shown in FIG. 1, the side flap portions greatly project outward in the lateral direction Y in the excretion portion facing region B, whereby a pair of side flap portions are formed on both the left and right sides of the absorbent body 5 along the vertical direction X. Wings 5W and 5W are extended. The wing portion 5W has a substantially trapezoidal shape in which the lower base (the side longer than the upper base) is located on the side portion side of the absorbent main body 5 in a plan view as shown in FIG. 1, and the non-skin facing surface thereof. A wing portion adhesive portion (not shown) for fixing the wing portion 5W to clothing such as shorts is formed in the wing portion. The wing portion 5W is used by being folded back toward the non-skin facing surface (outer surface) side of the crotch portion of clothing such as shorts. Since the wing portion 5W is used by being folded back toward the non-skin facing surface (outer surface) side of the crotch portion of clothing such as shorts, the non-skin facing surface of the wing portion 5W, which is the forming surface of the wing portion adhesive portion, is used. At the time of its use, it is directed toward the wearer's skin side and becomes a skin facing surface. Before its use, the adhesive portion of the wing portion is covered with a release sheet (not shown) made of a film, a non-woven fabric, paper or the like. Further, a pair of both side portions of the absorbent body 5 on the skin-facing surface, that is, the skin-facing surface of the surface sheet 2 along the vertical direction X, overlap with the left and right side portions of the absorbent body 4 along the vertical direction X in a plan view. Side sheets 6 and 6 are arranged over substantially the entire length of the absorbent body 5 in the vertical direction X. The pair of side sheets 6 and 6 are joined to the surface sheet 2 and other members by known joining means such as an adhesive or thermal embossing at a joining line (not shown) extending in the vertical direction X, respectively.

吸収体4は、図1に示すように、ナプキン1(吸収性本体5)の縦方向Xの略全長にわたっており、前方領域Aから排泄部対向領域Bを介して後方領域Cにわたって延在している。吸収体4は、ナプキン1の如き吸収性物品に組み込まれることで、人の肌に間接に当てがわれて、すなわち裏面シート3などの部材を介して間接的に肌に当てがわれて使用されるもので、使用時に使用者すなわちナプキン1の着用者の肌から相対的に近い位置に配される肌対向面(表面シート2との対向面)と、使用者の肌から相対的に遠い位置に配される非肌対向面(裏面シート3との対向面)とを有し、更に、使用者の前後方向に対応する縦方向Xとこれに直交する横方向Yとを有し、且つ前方領域A、排泄部対向領域B及び後方領域Cを縦方向Xに有する。吸収体4の前方領域Aは、吸収体4におけるナプキン1の前方領域Aに位置する部分であり、吸収体4の排泄部対向領域Bは、吸収体4におけるナプキン1の排泄部対向領域Bに位置する部分であり、吸収体4の後方領域Cは、吸収体4におけるナプキン1の後方領域Cに位置する部分である。なお、吸収体4は、このような肌に間接に当てて使用する形態の他、シートなどの部材を介さずに肌に直接当てて使用する形態を採ることも可能である。 As shown in FIG. 1, the absorber 4 extends substantially the entire length of the napkin 1 (absorbent body 5) in the vertical direction X, extends from the front region A to the rear region C via the excretion portion facing region B. There is. The absorber 4 is used by being incorporated into an absorbent article such as a napkin 1 and indirectly applied to human skin, that is, indirectly applied to the skin via a member such as a back sheet 3. The skin facing surface (facing surface facing the surface sheet 2) arranged at a position relatively close to the skin of the user, that is, the wearer of the napkin 1 at the time of use, and a position relatively far from the skin of the user. It has a non-skin facing surface (a surface facing the back surface sheet 3) arranged on the skin, and further has a vertical direction X corresponding to the front-rear direction of the user and a horizontal direction Y orthogonal to the vertical direction X, and is forward. It has a region A, an excretion portion facing region B, and a posterior region C in the vertical direction X. The front region A of the absorber 4 is a portion located in the front region A of the napkin 1 in the absorber 4, and the excretion portion facing region B of the absorber 4 is in the excretion portion facing region B of the napkin 1 in the absorber 4. It is a located portion, and the rear region C of the absorber 4 is a portion located in the rear region C of the napkin 1 in the absorber 4. In addition to the form of indirectly touching the skin for use, the absorber 4 can also be used by directly touching the skin without using a member such as a sheet.

図3〜図5には吸収体4が示されている。本実施形態における吸収体4は、液吸収性の吸収性コア40と、該吸収性コア40の外面を被覆する液透過性のコアラップシート41とを具備している。このように、本実施形態においては、吸収性コア40がコアラップシート41で包まれることで一体化されている。吸収性コア40は、吸収体4の主体をなすもので、図3に示す如き平面視において縦方向Xに長い形状を有している。吸収性コア40は、その長手方向をナプキン1の縦方向Xに一致させてナプキン1に配置されている。吸収性コア40とコアラップシート41との間は、ホットメルト型接着剤等の接着剤により接合されていてもよい。 The absorber 4 is shown in FIGS. 3 to 5. The absorber 4 in the present embodiment includes a liquid-absorbing absorbent core 40 and a liquid-permeable core wrap sheet 41 that covers the outer surface of the absorbent core 40. As described above, in the present embodiment, the absorbent core 40 is integrated by being wrapped with the core wrap sheet 41. The absorbent core 40 is the main body of the absorber 4, and has a long shape in the vertical direction X in a plan view as shown in FIG. The absorbent core 40 is arranged on the napkin 1 so that its longitudinal direction coincides with the vertical direction X of the napkin 1. The absorbent core 40 and the core wrap sheet 41 may be bonded by an adhesive such as a hot melt type adhesive.

本実施形態においては、コアラップシート41は、吸収性コア40の横方向Yの長さの2倍以上3倍以下の幅を有する1枚の連続したシートであり、図4に示すように、吸収性コア40の肌対向面の全域を被覆し、且つ吸収性コア40の縦方向Xに沿う両側縁から横方向Yの外方に延出し、その延出部が、吸収性コア40の下方に巻き下げられて、吸収性コア40の非肌対向面の全域を被覆している。なお、本発明においては、コアラップシートは、吸収性コア40の非肌対向面の全域を被覆し、且つ吸収性コア40の縦方向Xに沿う両側縁から横方向Yの外方に延出し、その延出部が、吸収性コア40の上方に巻き上げられて、吸収性コア40の肌対向面全域を被覆されていてもよい。また、コアラップシートはこのような1枚のシートでなくてもよく、例えば、吸収性コア40の肌対向面を被覆する1枚の肌側コアラップシートと、該肌側コアラップシートとは別体で、吸収性コア40の非肌対向面を被覆する1枚の非肌側コアラップシートとの2枚を含んで構成されていてもよい。また、吸収体4はコアラップシートを具備していなくてもよく、本発明に係る吸収体には、吸収性コアのみからなる吸収体が包含される。 In the present embodiment, the core wrap sheet 41 is one continuous sheet having a width of 2 times or more and 3 times or less the length of the absorbent core 40 in the lateral direction Y, and as shown in FIG. It covers the entire surface of the absorbent core 40 facing the skin, and extends outward in the horizontal direction Y from both side edges along the vertical direction X of the absorbent core 40, and the extending portion is below the absorbent core 40. It is rolled up to cover the entire non-skin facing surface of the absorbent core 40. In the present invention, the core wrap sheet covers the entire non-skin facing surface of the absorbent core 40 and extends outward in the horizontal direction Y from both side edges of the absorbent core 40 along the vertical direction X. The extending portion thereof may be rolled up above the absorbent core 40 to cover the entire skin-facing surface of the absorbent core 40. Further, the core wrap sheet does not have to be such a single sheet. For example, one skin-side core wrap sheet that covers the skin-facing surface of the absorbent core 40 and the skin-side core wrap sheet are As a separate body, it may be configured to include two sheets, one non-skin side core wrap sheet covering the non-skin facing surface of the absorbent core 40. Further, the absorber 4 does not have to include a core wrap sheet, and the absorber according to the present invention includes an absorber composed of only an absorbent core.

吸収性コア40は、実質的に吸収体4そのものとも言えるものであり、以下の吸収性コア40についての説明は、特に断らない限り、吸収体4の説明として適宜適用される。吸収体4には、コアラップシートを含まず吸収性コアのみで構成された形態が包含されるところ、斯かる形態の吸収体では、吸収体と吸収性コアとは同じ意味である。 The absorbable core 40 can be said to be substantially the absorber 4 itself, and the following description of the absorbable core 40 is appropriately applied as a description of the absorber 4 unless otherwise specified. The absorber 4 includes a form composed of only an absorbent core without containing a core wrap sheet, and in such a form of the absorber, the absorber and the absorbent core have the same meaning.

吸収性コア40は、コア形成材料を主体として構成され、典型的には、コア形成材料のみから構成される。コア形成材料には少なくとも、吸水性繊維12Fと、繊維11Fを含む繊維塊11とが含まれる。本実施形態の吸収性コア40では、コア形成材料として更に、吸水性ポリマー13が含まれる。繊維塊11の構成繊維11Fは合成繊維である。 The absorbent core 40 is mainly composed of the core-forming material, and typically is composed of only the core-forming material. The core-forming material includes at least a water-absorbent fiber 12F and a fiber mass 11 containing the fiber 11F. In the absorbent core 40 of the present embodiment, the water-absorbent polymer 13 is further included as the core-forming material. The constituent fibers 11F of the fiber mass 11 are synthetic fibers.

本明細書において「繊維塊」とは、複数の繊維がまとまって一体となった繊維集合体のことである。本発明で用いる繊維塊はその製造方法を問わず、例えば、一定の大きさを有する合成繊維シートをカッター等により切断して得られたシート片の如き、定形の繊維集合体でもよく、あるいは、特許文献2に記載の不織布片の如き、合成繊維を主体とする不織布を細片状に粉砕し、あるいはむしり取ったり引きちぎり取ったりして製造された不定形の繊維集合体でもよい。本発明では、吸収体(吸収性コア)は、i)繊維塊として定形の繊維集合体のみを含む形態でもよく、ii)繊維塊として不定形の繊維集合体のみを含む形態でもよく、あるいはiii)繊維塊として定形の繊維集合体と不定型の繊維集合体とが混ざった形態でもよいが、好ましくは前記i)の形態が用いられる。不定形の繊維集合体は、構成繊維がランダムに配向しているために、表面のあちこちから繊維が突出するなどして表面が荒れているため、該繊維集合体同士がそれらの全面に亘って絡み合い、その結果、各繊維集合体の動きの自由度が制限されて柔軟性が低下するおそれがある。本実施形態の繊維塊11は、後述するように定形の繊維集合体である。 As used herein, the term "fiber mass" refers to a fiber aggregate in which a plurality of fibers are grouped together and integrated. The fiber mass used in the present invention may be a fixed-sized fiber aggregate such as a sheet piece obtained by cutting a synthetic fiber sheet having a certain size with a cutter or the like, regardless of the manufacturing method thereof. An amorphous fiber aggregate produced by crushing, or peeling or tearing off, a non-woven fabric mainly composed of synthetic fibers into fine pieces, such as the non-woven fabric piece described in Patent Document 2, may be used. In the present invention, the absorber (absorbable core) may be in the form of i) containing only a fixed fiber aggregate as a fiber mass, ii) a form containing only an amorphous fiber aggregate as a fiber mass, or iii. ) The fiber mass may be a mixture of a fixed fiber aggregate and an atypical fiber aggregate, but the form i) is preferably used. Since the constituent fibers of the amorphous fiber aggregate are randomly oriented, the surface is rough due to the fibers protruding from various parts of the surface, and the fiber aggregates are spread over the entire surface thereof. Entanglement may result in limited freedom of movement for each fiber assembly and reduced flexibility. The fiber mass 11 of the present embodiment is a fixed-form fiber aggregate as described later.

繊維塊11は、前述したとおり、複数の繊維11Fが塊状に集積されて一体化された繊維集合体であり、その形態を保持した状態で吸収性コア40中に複数存在する。そして繊維塊11は、その繊維集合体の形態に起因して、主として、吸収性コア40の柔軟性、クッション性、圧縮回復性、保形性の向上に寄与する。 As described above, the fiber lump 11 is a fiber aggregate in which a plurality of fibers 11F are integrated in a lump shape, and a plurality of fibers 11F are present in the absorbent core 40 while maintaining its morphology. The fiber mass 11 mainly contributes to the improvement of the flexibility, cushioning property, compression recovery property, and shape retention property of the absorbent core 40 due to the morphology of the fiber aggregate.

吸水性繊維12Fは、吸収性コア40中に複数存在しており、それら複数の吸水性繊維12Fは互いに交絡し得るものの、繊維塊11の構成繊維11Fのように集積されておらず、個々独立に存在することが好ましい。吸水性繊維12Fは主として、吸収性コア40の液吸収性の向上に寄与し、また、吸収性コア40の保形性の向上にも寄与する。 A plurality of water-absorbent fibers 12F are present in the absorbent core 40, and although the plurality of water-absorbent fibers 12F can be entangled with each other, they are not integrated like the constituent fibers 11F of the fiber mass 11, and are individually independent. It is preferable to be present in. The water-absorbent fiber 12F mainly contributes to the improvement of the liquid absorbency of the absorbent core 40, and also contributes to the improvement of the shape retention of the absorbent core 40.

吸水性繊維12Fとしては、この種の吸収性物品の吸収体の形成材料として従来使用されている吸水性繊維を用いることができる。吸水性の繊維としては、例えば、針葉樹パルプや広葉樹パルプ等の木材パルプ、綿パルプや麻パルプ等の非木材パルプ等の天然繊維;カチオン化パルプ、マーセル化パルプ等の変性パルプ;キュプラ、レーヨン等の再生繊維等が挙げられ、これらの1種を単独で又は2種以上を混合して用いることができる。吸水性繊維12Fの主たる役割が吸収体4の液吸収性の向上である点に鑑みれば、吸水性繊維12Fとしては、天然繊維、再生繊維(セルロース系繊維)が好ましい。 As the water-absorbent fiber 12F, a water-absorbent fiber conventionally used as a material for forming an absorber of this type of absorbent article can be used. Examples of the water-absorbent fiber include wood pulp such as coniferous pulp and broadleaf pulp, natural fiber such as non-wood pulp such as cotton pulp and hemp pulp; modified pulp such as cationized pulp and marcelled pulp; cupra, rayon and the like. Regenerated fibers and the like can be mentioned, and one of these can be used alone or in combination of two or more. Considering that the main role of the water-absorbent fiber 12F is to improve the liquid absorbency of the absorber 4, the water-absorbent fiber 12F is preferably a natural fiber or a regenerated fiber (cellulosic fiber).

吸水性ポリマー13は、吸水性ポリマーの小片として吸収性コア40中に複数存在し、主として、吸収性コア40内の液吸収性の向上に寄与する。吸水性ポリマー13の小片の形状は特に制限されず、例えば、球状、塊状、俵状、繊維状、不定形状であり得る。吸水性ポリマー13の平均粒子径は、好ましくは10μm以上、より好ましくは100μm以上、そして、好ましくは1000μm以下、より好ましくは800μm以下である。吸水性ポリマー13としては、一般に、アクリル酸又はアクリル酸アルカリ金属塩の重合物又は共重合物を用いることができる。その例としては、ポリアクリル酸及びその塩並びにポリメタクリル酸及びその塩が挙げられ、具体的には、アクアリックCA、アクアリックCAW(ともに(株)日本触媒社製)等のアクリル酸重合体部分ナトリウム塩が挙げられる。 A plurality of water-absorbent polymers 13 are present in the absorbent core 40 as small pieces of the water-absorbent polymer, and mainly contribute to the improvement of liquid absorbency in the absorbent core 40. The shape of the small piece of the water-absorbent polymer 13 is not particularly limited, and may be, for example, spherical, lumpy, bale-shaped, fibrous, or indefinite. The average particle size of the water-absorbent polymer 13 is preferably 10 μm or more, more preferably 100 μm or more, and preferably 1000 μm or less, more preferably 800 μm or less. As the water-absorbent polymer 13, a polymer or copolymer of acrylic acid or an alkali metal salt of acrylic acid can generally be used. Examples thereof include polyacrylic acid and salts thereof, and polymethacrylic acid and salts thereof. Specifically, acrylic acid polymers such as Aquaric CA and Aqualic CAW (both manufactured by Nippon Shokubai Co., Ltd.) Partial sodium salt can be mentioned.

吸収性コア40においては、複数の繊維塊11と吸水性繊維12Fとが混在しており、本実施形態では、両者が単に混在しているだけでなく、繊維塊11同士又は繊維塊11と吸水性繊維12Fとが互いに交絡している。本実施形態の吸収性コア40においては、複数の繊維塊11が吸収性コア40中の構成繊維(繊維11F,12F)との絡み合いによって結合して1つの繊維塊連続体を形成している。また、複数の繊維塊11同士が交絡しているとともに、繊維塊11と吸水性繊維12Fとが交絡して結合していてもよい。更に通常は、複数の吸水性繊維12F同士も互いに交絡している。吸収性コア40に含有されている複数の繊維塊11の少なくとも一部は、他の繊維塊11あるいは吸水性繊維12Fと交絡している。吸収性コア40においては、それに含有されている複数の繊維塊11の全部が互いに交絡して1つの繊維塊連続体を形成している場合があり得るし、複数の繊維塊連続体が互いに非結合の状態で混在している場合があり得る。 In the absorbent core 40, a plurality of fiber lumps 11 and water-absorbing fibers 12F are mixed, and in the present embodiment, not only both are simply mixed, but also the fiber lumps 11 or the fiber lumps 11 and water absorption are mixed. The sex fibers 12F are entangled with each other. In the absorbent core 40 of the present embodiment, a plurality of fiber masses 11 are entangled with the constituent fibers (fibers 11F and 12F) in the absorbent core 40 to form one fiber mass continuum. Further, a plurality of fiber lumps 11 may be entangled with each other, and the fiber lumps 11 and the water-absorbent fiber 12F may be entangled and bonded to each other. Further, usually, a plurality of water-absorbent fibers 12F are also entangled with each other. At least a part of the plurality of fiber lumps 11 contained in the absorbent core 40 is entangled with other fiber lumps 11 or the water-absorbent fiber 12F. In the absorbent core 40, all of the plurality of fiber masses 11 contained therein may be entangled with each other to form one fiber mass continuum, and the plurality of fiber mass continuums may not be mutually exclusive. It may be mixed in the combined state.

吸収性コア40においては、柔軟性などに優れる繊維塊11が含有されていることに加え、繊維塊11同士又は繊維塊11と吸水性繊維12Fとの間も互いに交絡によって結合しているため、吸収性コア40は外力への応答性が一層優れ、柔軟性、クッション性、圧縮回復性に優れる。吸収性コア40は、ナプキン1の着用時に様々な方向から受ける外力(例えばナプキン1の着用者の体圧)に対してしなやかに変形し、ナプキン1を着用者の身体にフィット性よく密着させ得る。このような吸収性コア40の優れた変形−回復特性は、吸収性コア40が圧縮された場合のみならず、ねじれた場合でも同様に発現し得る。すなわち、ナプキン1に組み込まれた吸収性コア40は、ナプキン1の着用時において着用者の両大腿部間に挟まれた状態で配置されるため、着用者の歩行動作の際の両大腿部の動きによって、縦方向Xに延びる仮想的な回転軸周りにねじられる場合があるが、そのような場合でも、吸収性コア40は高い変形−回復特性を備えているため、両大腿部からのねじれを促すような外力に対して容易に変形・回復し、したがってヨレにくく、ナプキン1に着用者の身体に対する高いフィット性を付与し得る。 In the absorbent core 40, in addition to containing the fiber lumps 11 having excellent flexibility and the like, the fiber lumps 11 or the fiber lumps 11 and the water-absorbent fiber 12F are also entangled with each other. The absorbent core 40 is more excellent in responsiveness to external force, and is excellent in flexibility, cushioning property, and compression recovery property. The absorbent core 40 can be flexibly deformed by an external force (for example, the body pressure of the wearer of the napkin 1) received from various directions when the napkin 1 is worn, and the napkin 1 can be brought into close contact with the wearer's body with good fit. .. Such excellent deformation-recovery properties of the absorbent core 40 can be exhibited not only when the absorbent core 40 is compressed, but also when it is twisted. That is, since the absorbent core 40 incorporated in the napkin 1 is arranged so as to be sandwiched between the wearer's thighs when the napkin 1 is worn, both thighs during the wearer's walking motion. Depending on the movement of the part, it may be twisted around a virtual rotation axis extending in the vertical direction X, but even in such a case, since the absorbent core 40 has high deformation-recovery characteristics, both thighs It easily deforms and recovers against an external force that promotes twisting from the napkin, and therefore does not easily twist, and can give the napkin 1 a high fit to the wearer's body.

吸収性コア40では、繊維塊11同士又は繊維塊11と吸水性繊維12Fとが交絡しているところ、ここでいう、繊維塊11同士等の「交絡」には、下記形態A及びBが包含される。
形態A:繊維塊11同士等が、融着ではなく、繊維塊11の構成繊維11F同士の絡み合いによって結合している形態。
形態B:吸収性コア40の自然状態(外力が加わっていない状態)では、繊維塊11同士等は結合していないが、吸収性コア40に外力が加わった状態では、繊維塊11同士等が構成繊維11F同士の絡み合いによって結合し得る形態。ここでいう、「吸収性コア40に外力が加わった状態」とは、例えば、吸収性コア40が適用された吸収性物品(本実施形態ではナプキン1)の着用中において、吸収性コア40に変形力が加わった状態である。
In the absorbent core 40, the fiber lumps 11 are entangled with each other or the fiber lumps 11 and the water-absorbent fiber 12F are entangled with each other. The "entanglement" between the fiber lumps 11 and the like includes the following forms A and B. Will be done.
Form A: A form in which the fiber lumps 11 and the like are not fused but are bonded by the entanglement of the constituent fibers 11F of the fiber lumps 11.
Form B: In the natural state of the absorbent core 40 (a state in which no external force is applied), the fiber lumps 11 and the like are not bonded to each other, but in a state where the absorbent core 40 is subjected to an external force, the fiber lumps 11 and the like are not bonded to each other. A form that can be bonded by entanglement of constituent fibers 11F. The term "a state in which an external force is applied to the absorbent core 40" as used herein means, for example, that the absorbent core 40 is worn while wearing an absorbent article (napkin 1 in the present embodiment) to which the absorbent core 40 is applied. It is in a state where a deforming force is applied.

このように、吸収性コア40においては、形態Aのように、繊維塊11は、他の繊維塊11又は吸水性繊維12Fと、繊維同士の絡み合いすなわち「交絡」によって結合している他、形態Bのように、他の繊維塊11又は吸水性繊維12Fと交絡し得る状態でも存在している。斯かる繊維の交絡による結合が、前述した吸収性コア40の作用効果を一層有効に発現するのに重要なポイントの1つとなっている。特に、吸収性コア40は、形態Aの「交絡」を有している方が保形性の点から好ましい。繊維の交絡による結合は、接着成分や融着が無く、繊維同士の絡み合いのみによってなされているため、繊維の融着による結合に比して、交絡している個々の要素(繊維塊11、吸水性繊維12F)の動きの自由度が高く、そのためその個々の要素は、それらからなる集合体としての一体性を維持し得る範囲で移動し得る。このように、吸収性コア40は、それに含有されている複数の繊維塊11同士あるいは繊維塊11と吸水性繊維12Fとが比較的ゆるく結合していることで、外力を受けたときに変形が可能な、緩やかな保形性を有しており、保形性とクッション性及び圧縮回復性等とが高いレベルで両立されている。そして、斯かる高品質の吸収性コア40を具備するナプキン1は、着用者の身体にフィット性良く密着し、着用感に優れる。 As described above, in the absorbent core 40, as in the form A, the fiber mass 11 is bonded to the other fiber mass 11 or the water-absorbent fiber 12F by entanglement, that is, "entanglement" between the fibers, and other forms. Like B, it also exists in a state where it can be entangled with another fiber mass 11 or the water-absorbent fiber 12F. The binding of such fibers by confounding is one of the important points for more effectively expressing the action and effect of the above-mentioned absorbent core 40. In particular, it is preferable that the absorbent core 40 has the "entanglement" of Form A from the viewpoint of shape retention. Since the entangled bonds of the fibers have no adhesive components or fusion and are made only by the entanglement of the fibers, the individual elements (fiber mass 11, water absorption) that are entangled are compared with the bonds by the entanglement of the fibers. The degree of freedom of movement of the sex fibers 12F) is high, so that the individual elements can move within a range that can maintain the unity as an aggregate composed of them. As described above, the absorbent core 40 is deformed when it receives an external force because the plurality of fiber lumps 11 contained therein or the fiber lumps 11 and the water-absorbent fiber 12F are relatively loosely bonded to each other. It has possible loose shape retention, and has both shape retention, cushioning, compression recovery, etc. at a high level. The napkin 1 provided with such a high-quality absorbent core 40 fits well to the wearer's body and has an excellent wearing feeling.

吸収性コア40における繊維塊11を介した結合態様の全てが「交絡」である必要はなく、吸収性コア40の一部に交絡以外の他の結合態様、例えば接着剤による接合などが含まれていてもよい。 Not all of the binding modes via the fiber mass 11 in the absorbent core 40 need to be "entangled", and a part of the absorbent core 40 includes other binding modes other than entanglement, such as bonding with an adhesive. May be.

ただし、例えば公知の防漏溝等、吸収性物品の他の部材と一体となった結果として吸収性コア40に形成された「繊維塊11を介した融着」を吸収性コア40から排除した残りの部分、すなわち、未加工の吸収性コア40そのものでは、繊維塊11同士の結合、又は繊維塊11と吸水性繊維12Fとの結合が「繊維の交絡」のみでなされていることが望ましい。 However, "fusion via the fiber mass 11" formed in the absorbent core 40 as a result of being integrated with other members of the absorbent article such as a known leak-proof groove was excluded from the absorbent core 40. In the remaining portion, that is, the raw absorbent core 40 itself, it is desirable that the fiber lumps 11 are bonded to each other or the fiber lumps 11 and the water-absorbent fiber 12F are bonded only by "entanglement of fibers".

前述した吸収性コア40の作用効果をより一層確実に発現させる観点から、形態Aである「交絡によって結合している繊維塊11」と形態Bである「交絡し得る状態の繊維塊11」との合計数は、吸収性コア40中の繊維塊11の全数に対して、好ましくは半数以上、より好ましくは70%以上、更に好ましくは80%以上である。
同様の観点から、形態Aの「交絡」を有する繊維塊11の数は、他の繊維塊11又は吸水性繊維12Fとの結合部を有する繊維塊11の全数の70%以上、特に80%以上あることが好ましい。
From the viewpoint of more reliably expressing the action and effect of the absorbent core 40 described above, the form A "fiber mass 11 bound by confounding" and the form B "fiber mass 11 in a confoundable state" The total number of the fibers is preferably half or more, more preferably 70% or more, still more preferably 80% or more, based on the total number of fiber lumps 11 in the absorbent core 40.
From the same viewpoint, the number of fiber lumps 11 having "entanglement" of Form A is 70% or more, particularly 80% or more of the total number of fiber lumps 11 having a joint with other fiber lumps 11 or water-absorbent fibers 12F. It is preferable to have.

吸収性コア40は、繊維塊11をはじめとするコア形成材料の配置の点で特徴付けられる。吸収性コア40においては、図3〜図5に示すように、繊維塊11は、吸収性コア40の全体に均一に分布しておらず、前方領域A及び後方領域Cよりも排泄部対向領域Bに比較的多く存在し、また、排泄部対向領域Bでは、肌対向面側B1よりも非肌対向面側B2に比較的多く存在する。 The absorbent core 40 is characterized in terms of placement of core-forming materials, including the fiber mass 11. In the absorbent core 40, as shown in FIGS. 3 to 5, the fiber mass 11 is not uniformly distributed throughout the absorbent core 40, and is a region facing the excretion portion rather than the anterior region A and the posterior region C. It is present in a relatively large amount in B, and is relatively abundant in the non-skin facing surface side B2 than in the skin facing surface side B1 in the excretion portion facing region B.

なお、吸収性コア40の排泄部対向領域Bの肌対向面側B1は、吸収性コア40の排泄部対向領域Bを厚み方向に二等分した場合の肌対向面寄りの部位、非肌対向面側B2は、斯かる場合の非肌対向面寄りの部位である。吸収性コア40の前方領域A及び後方領域Cそれぞれの肌対向面側及び非肌対向面側についても同様である。 The skin-facing surface side B1 of the excretion portion facing region B of the absorbent core 40 is a portion closer to the skin facing surface when the excretion portion facing region B of the absorbent core 40 is bisected in the thickness direction, and is non-skin facing. The surface side B2 is a portion closer to the non-skin facing surface in such a case. The same applies to the skin-facing surface side and the non-skin-facing surface side of the front region A and the rear region C of the absorbent core 40, respectively.

このような吸収性コア40における繊維塊11の偏在を、繊維塊11とともに吸収性コア40のコア形成材料として併用される吸水性繊維12Fとの合計含有質量と対比して、「繊維塊11及び吸水性繊維12Fの合計含有質量に対する繊維塊11の含有質量の比率」(以下、「繊維塊占有率」ともいう。)として規定すると、吸収性コア40の各部の繊維塊占有率は、前方領域A及び後方領域Cよりも排泄部対向領域Bの方が大きく、且つ排泄部対向領域Bでは、非肌対向面側B2よりも肌対向面側B1の方が小さいということになる。 The uneven distribution of the fiber lumps 11 in the absorbent core 40 is compared with the total mass of the water-absorbent fibers 12F used together with the fiber lumps 11 as the core forming material of the absorbent core 40. When defined as "the ratio of the content mass of the fiber mass 11 to the total content mass of the water-absorbent fiber 12F" (hereinafter, also referred to as "fiber mass occupancy rate"), the fiber mass occupancy rate of each part of the absorbent core 40 is the front region. The excretion portion facing region B is larger than A and the posterior region C, and in the excretion portion facing region B, the skin facing surface side B1 is smaller than the non-skin facing surface side B2.

繊維塊占有率は、吸収性コア40(吸収体4)の所定の測定対象部位について、該測定対象部位に存する繊維塊11及び吸水性繊維12Fそれぞれの含有量を質量で測定し、そうして測定された繊維塊11の含有質量を、吸水性繊維12F及び繊維塊11それぞれの含有質量の合計値で除して100分率で表したものである。すなわち、繊維塊占有率(質量%)={繊維塊11の含有質量/(吸水性繊維12Fの含有質量+繊維塊11の含有質量)}×100である。 The fiber mass occupancy rate is determined by measuring the content of each of the fiber mass 11 and the water-absorbent fiber 12F existing in the measurement target portion of the absorbent core 40 (absorbent body 4) by mass. The measured content mass of the fiber mass 11 is divided by the total value of the content mass of each of the water-absorbent fiber 12F and the fiber mass 11 and expressed as a 100% ratio. That is, the fiber mass occupancy rate (mass%) = {content mass of fiber mass 11 / (content mass of water-absorbent fiber 12F + content mass of fiber mass 11)} × 100.

吸収性コア40の排泄部対向領域Bは、通常、ナプキン1の着用時において着用者の両大腿部間に挟まれるため、着用者の歩行動作の際の両大腿部の動きによって、縦方向Xに延びる仮想的な回転軸周りにねじられやすく、前方領域Aや後方領域Cに比して、外力が強く作用しやすく、ヨレが生じやすい。このような、比較的ヨレが生じやすい吸収性コア40の排泄部対向領域Bに、クッション性、圧縮回復性、保形性などの向上に寄与し得る繊維塊11を、前方領域A及び後方領域Cよりも多く配置する、すなわち排泄部対向領域Bの繊維塊占有率を前方領域A及び後方領域Cのそれよりも高くすることで、ナプキン1の着用時に吸収体4がヨレる不都合が効果的に防止される。 Since the excretion portion facing region B of the absorbent core 40 is normally sandwiched between the wearer's thighs when the napkin 1 is worn, the movement of both thighs during the wearer's walking motion causes the vertical movement of the napkin 1. It is easily twisted around a virtual rotation axis extending in the direction X, and an external force is likely to act stronger than in the front region A and the rear region C, and twisting is likely to occur. In the excretion portion facing region B of the absorbent core 40, which is relatively prone to twisting, a fiber mass 11 that can contribute to improvement of cushioning property, compression recovery property, shape retention property, etc. is provided in the front region A and the rear region. By arranging more than C, that is, by making the fiber mass occupancy rate of the excretory part facing region B higher than that of the anterior region A and the posterior region C, it is effective that the absorber 4 is twisted when the napkin 1 is worn. Is prevented.

特に本実施形態においては、前述したとおり吸収体4が、繊維塊11及び吸水性繊維12Fをはじめとするコア形成材料を含有する吸収性コア40と、該吸収性コア40の外面を被覆するコアラップシート41とを具備することで、該コア形成材料が一体化されているため、前述した繊維塊11の偏在による作用効果と相俟って、ナプキン1の着用時における吸収体4のヨレがより一層確実に防止され得る。 In particular, in the present embodiment, as described above, the absorber 4 includes the absorbent core 40 containing the core-forming material such as the fiber mass 11 and the water-absorbent fiber 12F, and the core that covers the outer surface of the absorbent core 40. Since the core forming material is integrated with the wrap sheet 41, the absorber 4 is twisted when the napkin 1 is worn, in combination with the action and effect of the uneven distribution of the fiber mass 11 described above. It can be prevented even more reliably.

また、吸収性コア40の排泄部対向領域Bの肌対向面側B1は、典型的には、吸水性繊維12Fが主体をなし、繊維塊11はほとんど含有されていないところ、そのような構成の肌対向面側B1は、体液を吸収して湿潤状態となった場合に保形性が著しく低下する傾向があり、湿潤状態で外圧により意図しない変形をし、ヨレやすいという問題がある。しかしながら、肌対向面側B1と厚み方向において隣接する吸収性コア40の非肌対向面側B2は、合成繊維を含む繊維塊11が偏在し湿潤状態でも保形性に優れる部位であるため、吸収性コア40の排泄部対向領域Bが体液を吸収して湿潤状態となった場合でもヨレが防止される。斯かるヨレ防止効果は、肌対向面側B1と非肌対向面側B2との界面及びその近傍において繊維塊11と吸水性繊維12Fとが交絡していると、より一層効果的である。 Further, the skin-facing surface side B1 of the excretion portion facing region B of the absorbent core 40 is typically composed mainly of water-absorbent fibers 12F and contains almost no fiber lumps 11. The skin-facing surface side B1 tends to have a significantly reduced shape retention when it becomes wet by absorbing body fluid, and there is a problem that it is easily deformed by external pressure in the wet state and is easily twisted. However, the non-skin facing surface side B2 of the absorbent core 40 adjacent to the skin facing surface side B1 in the thickness direction is a portion where fiber lumps 11 containing synthetic fibers are unevenly distributed and excellent in shape retention even in a wet state, and thus absorbs. Even when the region B facing the excretion portion of the sex core 40 absorbs body fluid and becomes wet, twisting is prevented. Such a twist prevention effect is even more effective when the fiber mass 11 and the water-absorbent fiber 12F are entangled at the interface between the skin facing surface side B1 and the non-skin facing surface side B2 and in the vicinity thereof.

また、吸収性コア40の排泄部対向領域Bの肌対向面側B1は、吸収性コア40において、ナプキン1の着用者の排泄部から排泄された体液を最初に受ける部位であるから、液引き込み性に優れ、体液を速やかに吸収性コア40内に吸収することが望まれる。また、吸収性コア40が含有するコア形成材料のうち、液引き込み性の向上に最も寄与し得るのは吸水性繊維12Fであり、繊維塊11は液引き込み性に向上にはあまり寄与しない。そこで、吸収性コア40の排泄部対向領域Bにおいては、繊維塊占有率に関して前記のとおり、「肌対向面側B1<非肌対向面側B2」なる大小関係を成立させ、肌対向面側B1の繊維塊占有率を非肌対向面側B2のそれよりも小さくする代わりに、肌対向面側B1に吸水性繊維12Fを比較的多く存在させるようにした。したがって、吸収性コア40は液引き込み性に優れ、排泄された体液を速やかに内部に引き込んで吸収保持し得る。また、繊維塊占有率に関して、「排泄部対向領域B>前後領域A,C」という関係を有することから、吸収性コア40では、排泄部対向領域Bで受けた体液が縦方向Xへ拡散して吸収され易い。このため、吸収性コア40は、体液の横漏れ抑制にも優れる。 Further, since the skin-facing surface side B1 of the excretion portion facing region B of the absorbent core 40 is the portion of the absorbent core 40 that first receives the body fluid excreted from the excretory portion of the wearer of the napkin 1, the liquid is drawn in. It is desired that the body fluid has excellent properties and is rapidly absorbed into the absorbent core 40. Further, among the core-forming materials contained in the absorbent core 40, the water-absorbent fiber 12F can contribute most to the improvement of the liquid drawability, and the fiber mass 11 does not contribute much to the improvement of the liquid drawability. Therefore, in the excretion portion facing region B of the absorbent core 40, as described above, the magnitude relationship of "skin facing surface side B1 <non-skin facing surface side B2" is established with respect to the fiber mass occupancy rate, and the skin facing surface side B1 Instead of making the fiber mass occupancy rate of the non-skin facing surface side B2 smaller than that of the non-skin facing surface side B2, a relatively large amount of water-absorbing fiber 12F was made to be present on the skin facing surface side B1. Therefore, the absorbent core 40 is excellent in liquid drawing property, and can quickly draw in the excreted body fluid to the inside and absorb and hold it. Further, since the fiber mass occupancy rate has a relationship of "excretion portion facing region B> anterior-posterior region A, C", in the absorbable core 40, the body fluid received in the excretion portion facing region B diffuses in the vertical direction X. Is easily absorbed. Therefore, the absorbent core 40 is also excellent in suppressing lateral leakage of body fluid.

前述した繊維塊11の偏在による作用効果をより確実に奏させるようにする観点から、吸収性コア40の各部の繊維塊占有率は以下のように設定することが好ましい。
吸収性コア40の排泄部対向領域Bの非肌対向面側B2の繊維塊占有率は、吸収性コア40の他の部位(前方領域A、後方領域C、排泄部対向領域Bの肌対向面側B1)のそれよりも高いことを前提として、好ましくは50質量%以上、より好ましくは90質量%以上であり、100質量%、すなわち繊維塊11を含有する代わりに吸水性繊維12Fを全く含有しなくてもよい。
吸収性コア40の排泄部対向領域Bの肌対向面側B1の繊維塊占有率は、非肌対向面側B2のそれよりも低いことを前提として、好ましくは50質量%以下、より好ましくは10質量%以下であり、0質量%、すなわち吸水性繊維12Fを含有する代わりに繊維塊11を全く含有しなくてもよい。
吸収性コア40の排泄部対向領域Bの非肌対向面側B2の繊維塊占有率と肌対向面側B1の繊維塊占有率との差は、前者から後者を差し引いた場合に、好ましくは50質量%以上、より好ましくは90質量%以上であり、100質量%、すなわち非肌対向面側B2に繊維塊11のみを含有し、肌対向面側B1に繊維塊11を全く含有しなくてもよい。
吸収性コア40の前方領域A及び後方領域Cの繊維塊占有率は、典型的にはそれぞれ、吸収性コア40の排泄部対向領域Bの肌対向面側B1のそれと同様に設定される。
From the viewpoint of more surely exerting the action and effect due to the uneven distribution of the fiber lumps 11 described above, it is preferable to set the fiber lump occupancy rate of each part of the absorbent core 40 as follows.
The fiber mass occupancy rate of the non-skin facing surface side B2 of the excretion portion facing region B of the absorbent core 40 is the skin facing surface of the other parts (front region A, rear region C, excretion portion facing region B) of the absorbent core 40. Assuming that it is higher than that of the side B1), it is preferably 50% by mass or more, more preferably 90% by mass or more, and 100% by mass, that is, it contains completely water-absorbent fiber 12F instead of containing the fiber mass 11. You don't have to.
The fiber mass occupancy rate of the skin-facing surface side B1 of the excretion portion facing region B of the absorbent core 40 is preferably 50% by mass or less, more preferably 10 on the assumption that it is lower than that of the non-skin facing surface side B2. It is 0% by mass or less, that is, it is not necessary to contain the fiber mass 11 at all instead of containing the water-absorbent fiber 12F.
The difference between the fiber mass occupancy rate of the non-skin facing surface side B2 and the fiber mass occupancy rate of the skin facing surface side B1 of the excretion portion facing region B of the absorbent core 40 is preferably 50 when the latter is subtracted from the former. It is 100% by mass or more, more preferably 90% by mass or more, that is, even if the non-skin facing surface side B2 contains only the fiber mass 11 and the skin facing surface side B1 does not contain any fiber mass 11. Good.
The fiber mass occupancy of the anterior region A and the posterior region C of the absorbent core 40 is typically set in the same manner as that of the skin facing surface side B1 of the excretory portion facing region B of the absorbent core 40, respectively.

前述した繊維塊11の排泄部対向領域Bでの偏在による作用効果をより確実に奏させるようにする観点から、排泄部対向領域Bに、吸収性コア40が含有する全ての繊維塊11の90質量%以上、特に95質量%以上が存在することが好ましい。 From the viewpoint of ensuring that the action and effect of the uneven distribution of the fiber mass 11 in the excretory portion facing region B is exerted more reliably, 90 of all the fiber masses 11 contained in the excretory portion facing region B in the absorbent core 40. It is preferably present in an amount of mass% or more, particularly 95% by mass or more.

吸収性コア40の排泄部対向領域Bにおいては、肌対向面側B1及び非肌対向面側B2それぞれにおいて、1)繊維塊占有率は厚み方向に変化せずに一定でもよく、あるいは、2)肌対向面側B1から非肌対向面側B2に向かうに従って繊維塊占有率が漸次増加してもよい。前記2)の形態では、吸収性コア40の厚み方向において、吸収性コア40の肌対向面及びその近傍では、繊維塊11は存在しないか又は吸収性コア40の排泄部対向領域Bにおいて最低の繊維塊占有率で存在し、吸収性コア40の非肌対向面及びその近傍では、繊維塊11は吸収性コア40の排泄部対向領域Bにおいて最高の繊維塊占有率で存在する。吸収性コア40の前方領域A及び後方領域Cについても、前記1)又は2)の形態があり得る。 In the excretion portion facing region B of the absorbent core 40, the fiber mass occupancy rate may be constant without changing in the thickness direction in each of the skin facing surface side B1 and the non-skin facing surface side B2, or 2). The fiber mass occupancy rate may gradually increase from the skin-facing surface side B1 to the non-skin-facing surface side B2. In the form of 2) above, in the thickness direction of the absorbent core 40, the fiber mass 11 does not exist in the skin facing surface of the absorbent core 40 and its vicinity thereof, or the fiber mass 11 is the lowest in the excretory portion facing region B of the absorbent core 40. It exists at the fiber mass occupancy rate, and in the non-skin facing surface of the absorbent core 40 and its vicinity, the fiber mass 11 exists at the highest fiber mass occupancy rate in the excretion portion facing region B of the absorbent core 40. The anterior region A and the posterior region C of the absorbent core 40 may also have the form of 1) or 2) above.

前記1)の形態に特有の利点として、吸収体(吸収性コア)の肌対向面側と非肌対向面側とで、各々独立した機能に設計し易い点が挙げられる。また、前記2)の形態に特有の利点として、吸水性繊維と繊維塊との混合比率が吸収体の厚み方向で緩やかに変化するため、吸収体に外力が加わった場合でも繊維塊を介在する交絡状態が厚み方向に亘って維持され易く、使用中において吸収体のクッション性が良好に維持され易い点が挙げられる。 An advantage peculiar to the form of 1) is that the absorber (absorbent core) can be easily designed to have independent functions on the skin-facing surface side and the non-skin-facing surface side. Further, as an advantage peculiar to the form of 2) above, since the mixing ratio of the water-absorbent fiber and the fiber mass gradually changes in the thickness direction of the absorber, the fiber mass is interposed even when an external force is applied to the absorber. The entangled state is easily maintained in the thickness direction, and the cushioning property of the absorber is easily maintained during use.

また、繊維塊占有率は、吸収性コア40の前方領域A及び後方領域Cそれぞれから排泄部対向領域Bに向かうに従って漸次増加してもよい。例えば、前方領域A及び後方領域Cそれぞれにおいては、縦方向Xの外方から内方に向かうに従って繊維塊占有率が漸次増加し、排泄部対向領域Bは前記1)又は2)の形態であってもよい。 Further, the fiber mass occupancy rate may be gradually increased from each of the anterior region A and the posterior region C of the absorbent core 40 toward the excretion portion facing region B. For example, in each of the anterior region A and the posterior region C, the fiber mass occupancy rate gradually increases from the outside to the inward in the longitudinal direction X, and the excretion portion facing region B is in the form of 1) or 2) above. You may.

本実施形態においては、吸収性コア40の排泄部対向領域Bは、図4(a)に示すように、繊維塊占有率が好ましくは50質量%以上、より好ましくは90質量%以上の部位(以下、「繊維塊リッチ部位」ともいう。)11Pと、繊維塊占有率が好ましくは50質量%未満、より好ましくは10質量%以下の部位(以下、「吸水性繊維リッチ部位」ともいう。)12Pとを厚み方向に有し、より具体的には、非肌対向面側B2の全体が繊維塊リッチ部位11P、肌対向面側B1の全体が吸水性繊維リッチ部位12Pとなっている。したがって、図4(a)に示す吸収性コア40の排泄部対向領域Bにおいては、肌対向面側B1(吸水性繊維リッチ部位12P)と非肌対向面側B2(繊維塊リッチ部位11P)との境界で、繊維塊占有率が大きく変化している。 In the present embodiment, as shown in FIG. 4A, the excretion portion facing region B of the absorbent core 40 is a portion having a fiber mass occupancy rate of preferably 50% by mass or more, more preferably 90% by mass or more (as shown in FIG. 4A). Hereinafter, it is also referred to as “fiber mass rich portion”) 11P and a site having a fiber mass occupancy rate of preferably less than 50% by mass, more preferably 10% by mass or less (hereinafter, also referred to as “water-absorbent fiber rich portion”). 12P is provided in the thickness direction, and more specifically, the entire non-skin facing surface side B2 is a fiber mass rich portion 11P, and the entire skin facing surface side B1 is a water absorbing fiber rich portion 12P. Therefore, in the excretion portion facing region B of the absorbent core 40 shown in FIG. 4A, the skin facing surface side B1 (water-absorbing fiber rich portion 12P) and the non-skin facing surface side B2 (fiber mass rich portion 11P) At the boundary of, the fiber mass occupancy rate changes significantly.

吸水性繊維リッチ部位12Pは、吸水性繊維占有率が好ましくは50質量%以上、より好ましくは90質量%以上の部位である。ここでいう「吸水性繊維占有率」とは、繊維塊11及び吸水性繊維12Fの合計含有質量に対する吸水性繊維12Fの含有質量の比率であり、前述した繊維塊占有率の算出式の分子を「繊維塊11の含有質量」から「吸水性繊維の含有質量」に置き換えて算出される。 The water-absorbent fiber-rich portion 12P is a portion having a water-absorbent fiber occupancy rate of preferably 50% by mass or more, more preferably 90% by mass or more. The "water-absorbent fiber occupancy rate" referred to here is the ratio of the content mass of the water-absorbent fiber 12F to the total content mass of the fiber mass 11 and the water-absorbent fiber 12F, and the molecule of the above-mentioned fiber mass occupancy calculation formula is used. It is calculated by replacing the "content mass of the fiber mass 11" with the "content mass of the water-absorbent fiber".

吸収性コア40の前方領域A及び後方領域Cは、それぞれ図4(b)及び図5に示すように、繊維塊11はほとんど含有されておらず、両領域A,Cの繊維塊占有率は0質量%か又はそれに近く、その全体が吸水性繊維リッチ部位12Pとなっている。 As shown in FIGS. 4 (b) and 5, the anterior region A and the posterior region C of the absorbent core 40 contain almost no fiber mass 11, and the fiber mass occupancy rates of both regions A and C are high. It is 0% by mass or close to 0% by mass, and the whole is a water-absorbent fiber rich portion 12P.

繊維塊リッチ部位11Pは、繊維塊11が主体をなし、典型的には、吸水性繊維12Fは実質的に含有されていない程度であることから、繊維塊11の特性が強く反映され、主として、吸収性コア40の柔軟性、クッション性、圧縮回復性、保形性などの向上に寄与する。繊維塊リッチ部位11Pにおいては、その全体に繊維塊11が高密度且つ均一に分布していることが好ましい。一方、吸水性繊維リッチ部位12Pは、吸水性繊維12Fが主体をなし、典型的には、繊維塊11は実質的に含有されていない程度であることから、吸水性繊維12Fの特性が強く反映され、主として、吸収性コア40の液引き込み性の向上に寄与する。吸水性繊維リッチ部位12Pにおいては、その全体に吸水性繊維12Fが高密度且つ均一に分布していることが好ましい。 Since the fiber mass 11 P is mainly composed of the fiber mass 11 and typically does not contain the water-absorbent fiber 12F substantially, the characteristics of the fiber mass 11 are strongly reflected, and mainly, It contributes to the improvement of flexibility, cushioning property, compression recovery property, shape retention property and the like of the absorbent core 40. In the fiber mass rich portion 11P, it is preferable that the fiber mass 11 is densely and uniformly distributed throughout the fiber mass. On the other hand, the water-absorbent fiber rich portion 12P is mainly composed of the water-absorbent fiber 12F, and typically the fiber mass 11 is not substantially contained, so that the characteristics of the water-absorbent fiber 12F are strongly reflected. It mainly contributes to the improvement of the liquid drawability of the absorbent core 40. In the water-absorbent fiber rich portion 12P, it is preferable that the water-absorbent fiber 12F is densely and uniformly distributed over the entire portion.

吸収性コア40の各部の繊維塊占有率に関して、前述したとおり、「前方領域A、後方領域C<排泄部対向領域B」なる大小関係と、「排泄部対向領域Bの肌対向面側B1<非肌対向面側B2」なる大小関係とが成立することを前提として、繊維塊リッチ部位11P及び吸水性繊維リッチ部位12Pの位置は特に制限されず、吸収性コア40の排泄部対向領域Bの肌対向面側B1に繊維塊リッチ部位11Pが存在してもよく、非肌対向面側B2に吸水性繊維リッチ部位12Pが存在してもよい。 Regarding the fiber mass occupancy rate of each part of the absorbable core 40, as described above, there is a magnitude relationship of "front region A, rear region C <excretion portion facing region B" and "skin facing surface side B1 of the excretion portion facing region B". The positions of the fiber mass rich portion 11P and the water-absorbent fiber rich portion 12P are not particularly limited on the premise that the magnitude relationship of "non-skin facing surface side B2" is established, and the excretion portion facing region B of the absorbent core 40 The fiber mass rich portion 11P may be present on the skin facing surface side B1 and the water absorbing fiber rich portion 12P may be present on the non-skin facing surface side B2.

吸水性繊維リッチ部位12Pは、吸収性コア40の肌対向面から該吸収性コア40の厚み方向内方に該吸収性コア40の厚みの20〜80%にわたって存在することが好ましく、該厚みの30〜70%にわたって存在することがより好ましい。
繊維塊リッチ部位11Pは、吸収性コア40の非肌対向面から該吸収性コア40の厚み方向内方に該吸収性コア40の厚みの20〜80%にわたって存在することが好ましく、該厚みの30〜70%にわたって存在することがより好ましい。
吸水性繊維リッチ部位12P、繊維塊リッチ部位11Pそれぞれの厚みは、好ましくは0.5mm以上、より好ましくは1mm以上、そして、好ましくは5mm以下、より好ましくは4mm以下である。
吸収性コア40の各部の厚みは、以下の方法で測定される。なお、吸収性コア40(吸収体4)全体の厚み、ナプキン1の厚みなども以下の方法に準じて測定することができる。
The water-absorbent fiber-rich portion 12P preferably exists from the skin-facing surface of the absorbent core 40 inward in the thickness direction of the absorbent core 40 over 20 to 80% of the thickness of the absorbent core 40. More preferably, it is present over 30-70%.
The fiber mass rich portion 11P preferably exists from the non-skin facing surface of the absorbent core 40 inward in the thickness direction of the absorbent core 40 over 20 to 80% of the thickness of the absorbent core 40, and has a thickness of 20 to 80%. More preferably, it is present over 30-70%.
The thickness of each of the water-absorbent fiber-rich portion 12P and the fiber mass-rich portion 11P is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 4 mm or less.
The thickness of each part of the absorbent core 40 is measured by the following method. The thickness of the entire absorbent core 40 (absorbent body 4), the thickness of the napkin 1, and the like can also be measured according to the following method.

<厚みの測定方法>
吸収性コア(吸収体)を水平な場所にシワや折れ曲がりがないように静置し、該吸収性コアから測定対象部位(例えば、吸収性コアの肌対向面側又は非肌対向面側)を切り出して測定サンプルとする。そして、測定サンプルにおける5cN/cmの荷重下での厚みを測定する。具体的には、厚みの測定に、例えば、厚み計PEACOCK DIAL UPRIGHT GAUGES R5-C(OZAKI MFG.CO.LTD.製)を用いる。このとき、厚み計の先端部と測定サンプルとの間に、荷重が5cN/cmとなるように大きさを調整した平面視円形状又は正方形状のプレート(厚み5mm程度のアクリル板)を配置して、厚みを測定する。厚み測定では、測定サンプルにおける任意の10箇所を測定し、それら10箇所の厚みの平均値を算出して、測定サンプルの厚みとする。
<Thickness measurement method>
The absorbent core (absorbent body) is placed on a horizontal surface so as not to be wrinkled or bent, and the measurement target site (for example, the skin-facing surface side or the non-skin facing surface side of the absorbent core) is separated from the absorbent core. Cut out and use as a measurement sample. Then, the thickness of the measurement sample under a load of 5 cN / cm 2 is measured. Specifically, for measuring the thickness, for example, a thickness meter PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) Is used. At this time, a planar circular or square plate (acrylic plate with a thickness of about 5 mm) whose size is adjusted so that the load is 5 cN / cm 2 is placed between the tip of the thickness gauge and the measurement sample. Then measure the thickness. In the thickness measurement, any 10 points in the measurement sample are measured, and the average value of the thicknesses of those 10 points is calculated and used as the thickness of the measurement sample.

吸収性コア40の厚みは、排泄部対向領域Bの横方向Yの中央(吸収性コア40を横方向Yに二等分して縦方向Xに延びる仮想直線と重なる位置)よりも前方領域A及び後方領域Cの方が薄いことが好ましい。これにより、ナプキン1の着用時において吸収性コア40の前後領域A,Cがショーツ等の着衣になじんで追従しやすくなり、着用者の前身頃や臀部側の着用感がより一層向上し得る。また、吸収性コア40では、少なくとも排泄部対向領域Bの横方向Yの中央及びその近傍すなわち中央部(後述する隆起部15の形成位置)が、前後領域A,Cと比べて肉厚の構造となっている。そのため、前後領域A,Cよりも排泄部対向領域Bで繊維塊占有率が大きいことと相まって、ナプキン1の着用時において、吸収性コア40における排泄部対向領域Bの横方向Yの中央部と平面視で重複する部分が、着用者の排泄部に一層密着性よくフィットし得る。斯かる吸収性コア40の縦方向Xにおける厚み差は、前述したように、吸収性コア40の排泄部対向領域Bの繊維塊占有率が前方領域A及び後方領域Cのそれよりも高められることで実現し得る。 The thickness of the absorbent core 40 is the region A ahead of the center of the lateral direction Y of the excretory portion facing region B (the position where the absorbent core 40 is bisected in the horizontal direction Y and overlaps with the virtual straight line extending in the vertical direction X). And the rear region C is preferably thinner. As a result, when the napkin 1 is worn, the front and rear regions A and C of the absorbent core 40 become familiar with and follow the clothes such as shorts, and the wearing feeling on the front body and buttocks side of the wearer can be further improved. Further, in the absorbent core 40, at least the center of the excretion portion facing region B in the lateral direction and its vicinity, that is, the central portion (the formation position of the raised portion 15 described later) is thicker than the front and rear regions A and C. It has become. Therefore, in combination with the fact that the fiber mass occupancy rate is larger in the excretion portion facing region B than in the anterior-posterior regions A and C, when the napkin 1 is worn, it becomes the central portion of the excretion portion facing region B in the absorbent core 40 in the lateral direction Y. The overlapping portions in the plan view can fit the wearer's excretory portion more closely. As described above, the difference in thickness of the absorbent core 40 in the vertical direction means that the fiber mass occupancy of the excretory portion facing region B of the absorbent core 40 is higher than that of the anterior region A and the posterior region C. Can be realized with.

なお、吸収性コア40は、典型的には、排泄部対向領域Bにおいて厚みが横方向Yの全長(全幅)にわたって均一の形態であるか、又は図2に示す如くに、横方向Yの中央部がその両側部よりも厚みが大きい肉厚の構造の形態であるところ、いずれの形態でも、前記の大小関係すなわち、「排泄部対向領域Bにおける吸収性コア40の横方向Yの中央(中央部)の厚み>前方領域Aにおける吸収性コア40の厚み、後方領域Cにおける吸収性コア40の厚み」の関係が成立する場合には、「排泄部対向領域Bにおける吸収性コア40の横方向Yの両側部の厚み>前方領域Aにおける吸収性コア40の厚み、後方領域Cにおける吸収性コア40の厚み」の関係も成立する。 The absorbent core 40 typically has a uniform thickness over the entire length (total width) of the lateral direction Y in the excretion portion facing region B, or, as shown in FIG. 2, the center of the lateral direction Y. Where the portion is a form of a wall-thick structure having a thickness larger than that of both side portions, in any form, the above-mentioned magnitude relationship, that is, "the center (center) of the absorbent core 40 in the excretion portion facing region B in the lateral direction Y". When the relationship of "thickness of part)> thickness of the absorbent core 40 in the front region A and thickness of the absorbent core 40 in the rear region C" is established, "the lateral direction of the absorbent core 40 in the excretory portion facing region B". The relationship of "thickness of both sides of Y> thickness of the absorbent core 40 in the front region A and thickness of the absorbent core 40 in the rear region C" is also established.

吸収性コア40において、前方領域Aの厚みと排泄部対向領域Bの横方向Yの中央(又は領域Bにおいて厚みが最大の部分)の厚みとの比率は、前者<後者を前提として、前者/後者として、好ましくは0.1以上、より好ましくは0.3以上、そして、好ましくは0.9以下、より好ましくは0.8以下である。後方領域Cの厚みと排泄部対向領域Bの横方向Yの中央(又は領域Bにおいて厚みが最大の部分)の厚みとの比率についても、前記と同様に設定することが好ましい。
吸収性コア40の排泄部対向領域Bの厚み(横方向Yにおいて厚みが異なる場合は最大厚み)は、好ましくは3mm以上、より好ましくは4mm以上、そして、好ましくは10mm以下、より好ましくは8mm以下である。
吸収性コア40の前方領域A及び後方領域Cの厚みは、それぞれ、好ましくは1mm以上、より好ましくは2mm以上、そして、好ましくは8mm以下、より好ましくは6mm以下である。
In the absorptive core 40, the ratio of the thickness of the front region A to the thickness of the center of the lateral Y of the excretory portion facing region B (or the portion having the maximum thickness in the region B) is the former <the latter, the former / The latter is preferably 0.1 or more, more preferably 0.3 or more, and preferably 0.9 or less, more preferably 0.8 or less. The ratio of the thickness of the rear region C to the thickness of the center (or the portion having the maximum thickness in the region B) of the excretion portion facing region B in the lateral direction is also preferably set in the same manner as described above.
The thickness of the excretion portion facing region B of the absorbent core 40 (the maximum thickness when the thickness is different in the lateral direction Y) is preferably 3 mm or more, more preferably 4 mm or more, and preferably 10 mm or less, more preferably 8 mm or less. Is.
The thickness of the front region A and the rear region C of the absorbent core 40 is preferably 1 mm or more, more preferably 2 mm or more, and preferably 8 mm or less, more preferably 6 mm or less, respectively.

前述した繊維塊11の偏在による作用効果をより確実に奏させるようにする観点から、吸収性コア40の非肌対向面における排泄部対向領域Bに位置する部分の面積は、吸収性コア40の非肌対向面の面積の60%以下、特に50%以下、更には40%以下が好ましい。吸収性コア40の排泄部対向領域Bに位置する部分は、前方領域A及び後方領域Cに位置する部分よりも繊維塊占有率が高い部位であり、特にその非肌対向面側B2は繊維塊占有率が高いことから、該領域B全体として、繊維塊11が有するクッション性が強く反映された「クッション部」とも言える部位である。特に本実施形態においては、非肌対向面側B2が、繊維塊11が主体をなし吸水性繊維12Fをほとんど含有しない繊維塊リッチ部位11Pであるため、該部位11Pを具備する排泄部対向領域Bは、クッション部として有効に機能し得る。つまり、前記の「吸収性コア40の非肌対向面の面積に対する、排泄部対向領域Bの非肌対向面の面積の割合」は、「吸収性コア40(吸収体4)の非肌対向面の面積に対する、クッション部(吸収性コア40において繊維塊11が該吸収性コア40の非肌対向面側に偏在している部位)の非肌対向面の面積の割合」(以下、「クッション部面積率」ともいう。)に言い換えることができる。クッション部面積率が60%以下、すなわち繊維塊11が非肌対向面側B2に偏在している排泄部対向領域Bの面積率が60%以下であることにより、前方領域Aと後方領域Cにおいて体の前身頃やおしり側の装着感を高められるという効果が奏される。なお、クッション部面積率の下限は、排泄部対向領域Bのフィット性を確実に高め、装着感を向上させる観点から、好ましくは20%以上、より好ましくは25%、更に好ましくは30%以上である。クッション部面積率は下記式により算出される。
クッション部面積率(%)=(クッション部の非肌対向面の面積/吸収性コアの非肌対向面の面積)×100
From the viewpoint of more reliably exerting the action and effect due to the uneven distribution of the fiber lumps 11 described above, the area of the portion of the absorbent core 40 located on the non-skin facing surface in the excretory portion facing region B is the area of the absorbent core 40. It is preferably 60% or less, particularly 50% or less, more preferably 40% or less of the area of the non-skin facing surface. The portion of the absorbable core 40 located in the excretion portion facing region B is a portion having a higher fiber mass occupancy rate than the portions located in the front region A and the rear region C, and in particular, the non-skin facing surface side B2 thereof is a fiber mass. Since the occupancy rate is high, the region B as a whole is a portion that can be said to be a “cushion portion” in which the cushioning property of the fiber mass 11 is strongly reflected. In particular, in the present embodiment, since the non-skin facing surface side B2 is a fiber mass rich portion 11P in which the fiber mass 11 is the main component and hardly contains the water-absorbing fiber 12F, the excretion portion facing region B including the site 11P is provided. Can function effectively as a cushioning portion. That is, the above-mentioned "ratio of the area of the non-skin facing surface of the excretory portion facing region B to the area of the non-skin facing surface of the absorbent core 40" is "the non-skin facing surface of the absorbent core 40 (absorbent body 4)". The ratio of the area of the non-skin facing surface of the cushion portion (the portion of the absorbent core 40 where the fiber mass 11 is unevenly distributed on the non-skin facing surface side of the absorbent core 40) to the area of the cushion portion (hereinafter, "cushion portion" It can be rephrased as "area ratio". The area ratio of the cushion portion is 60% or less, that is, the area ratio of the excretion portion facing region B in which the fiber mass 11 is unevenly distributed on the non-skin facing surface side B2 is 60% or less, so that the front region A and the rear region C The effect of enhancing the wearing feeling on the front body and buttocks side of the body is achieved. The lower limit of the cushion area ratio is preferably 20% or more, more preferably 25%, still more preferably 30% or more from the viewpoint of surely enhancing the fit of the excretion part facing region B and improving the wearing feeling. is there. The cushion area ratio is calculated by the following formula.
Cushion area ratio (%) = (Area of non-skin facing surface of cushion / Area of non-skin facing surface of absorbent core) x 100

前述したとおり、吸収性コア40には吸水性ポリマー13が含有されるところ、吸収性コア40における吸水性ポリマー13の存在部位は特に制限されず、吸収性コア40の全体に均一に分布していてもよく、吸収性コア40の一部に偏在していてもよいが、少なくとも吸収性コア40の排泄部対向領域Bに存在していることが好ましい。これにより、前述した繊維塊11の偏在による作用効果(特に液引き込み性の向上効果)と相俟って、吸液性がより一層向上し得る。更に、吸収性コア40の排泄部対向領域Bにおいては、非肌対向面側B2よりも肌対向面側B1に吸水性ポリマー13が多く存在するとより効果的である。すなわち、吸収性コア40は、吸水性ポリマー13を少なくとも排泄部対向領域Bに含有し、且つ吸収性コア40における吸水性ポリマー13の含有量は、非肌対向面側B2よりも肌対向面側B1の方が多いことが好ましい。 As described above, when the water-absorbent polymer 13 is contained in the absorbable core 40, the location of the water-absorbent polymer 13 in the absorbable core 40 is not particularly limited and is uniformly distributed throughout the absorbable core 40. It may be unevenly distributed in a part of the absorptive core 40, but it is preferably present at least in the excretion portion facing region B of the absorptive core 40. As a result, the liquid absorption property can be further improved in combination with the action effect (particularly the effect of improving the liquid drawing property) due to the uneven distribution of the fiber mass 11 described above. Further, in the excretion portion facing region B of the absorbent core 40, it is more effective if more water-absorbing polymer 13 is present on the skin facing surface side B1 than on the non-skin facing surface side B2. That is, the absorbent core 40 contains at least the water-absorbent polymer 13 in the excretion portion facing region B, and the content of the water-absorbing polymer 13 in the absorbent core 40 is on the skin-facing surface side rather than the non-skin facing surface side B2. It is preferable that B1 is more.

また、吸収性コア40の排泄部対向領域Bの非肌対向面側B2には、繊維塊11のみならず、吸水性繊維12F及び/又は吸水性ポリマー13が含有されていることが好ましい。斯かる構成により、非肌対向面側B2に体液が導入されやすくなり、非肌対向面側B2に体液を効率的に固定することが可能となり、吸収性コア40の吸液性がより一層向上し得る。 Further, it is preferable that not only the fiber mass 11 but also the water-absorbent fiber 12F and / or the water-absorbent polymer 13 is contained in the non-skin facing surface side B2 of the excretion portion facing region B of the absorbent core 40. With such a configuration, the body fluid is easily introduced into the non-skin facing surface side B2, the body fluid can be efficiently fixed to the non-skin facing surface side B2, and the liquid absorption property of the absorbent core 40 is further improved. Can be done.

本実施形態においては、吸収性コア40は、図5に示すように、排泄部対向領域Bに、周辺部よりもナプキン1の着用者(吸収体4の使用者)の肌側に向かって隆起した隆起部15を有している。隆起部15は、その周辺部よりもコア形成材料の坪量が多く、そのため、厚みも周辺部に比して厚い。本実施形態における隆起部15は、排泄部対向領域Bの排泄部対向部(排泄ポイント)に形成されており、より具体的には、該排泄部対向部が位置する、吸収性コア40の排泄部対向領域Bの横方向Yの中央部が、周辺部よりも着用者の肌側に凸状に隆起して形成されている。そして、吸収性コア40の排泄部対向領域Bに隆起部15が存在することで、これに対応するナプキン1の排泄部対向領域Bは、図2に示すように、肌対向面に着用者の肌側に向かって凸状をなす凸部を有している。このように、ナプキン1の排泄部対向領域Bの肌対向面に、吸収性コア40の隆起部15に対応した凸部が存在することで、該凸部が着用者の排泄部に密着するため、着用感及び吸液性が向上し得る。また、前記凸部が存在する吸収性コア40の排泄部対向領域Bにおいては、前述したとおり、繊維塊11が非肌対向面側B2に偏在することで、吸収性コア40のヨレにくさや液引き込み性が高いレベルで確保されているので、該凸部による作用効果と相俟って、ナプキン1の着用感及び吸液性がより一層向上し得る。なお、隆起部15は、吸収性コア40の排泄部対向領域Bの横方向Yの全長にわたって形成されていてもよい。また、隆起部15は、排泄部対向領域Bから前方領域A及び/又は後方領域Cに延出していてもよい。 In the present embodiment, as shown in FIG. 5, the absorbent core 40 is raised in the excretion portion facing region B toward the skin side of the wearer of the napkin 1 (user of the absorber 4) rather than the peripheral portion. It has a raised portion 15. The raised portion 15 has a larger basis weight of the core forming material than the peripheral portion, and therefore the thickness of the raised portion 15 is also thicker than that of the peripheral portion. The raised portion 15 in the present embodiment is formed in the excretion portion facing portion (excretion point) of the excretion portion facing region B, and more specifically, the excretion of the absorbable core 40 in which the excretion portion facing portion is located. The central portion of the portion facing region B in the lateral direction Y is formed so as to be convexly raised toward the wearer's skin side with respect to the peripheral portion. Then, since the raised portion 15 is present in the excretion portion facing region B of the absorbent core 40, the excretion portion facing region B of the napkin 1 corresponding to this is formed on the skin facing surface of the wearer as shown in FIG. It has a convex portion that forms a convex shape toward the skin side. As described above, since the convex portion corresponding to the raised portion 15 of the absorbent core 40 is present on the skin facing surface of the excretory portion facing region B of the napkin 1, the convex portion is in close contact with the excretory portion of the wearer. , Wearing feeling and liquid absorption can be improved. Further, in the excretion portion facing region B of the absorbent core 40 in which the convex portion is present, as described above, the fiber lumps 11 are unevenly distributed on the non-skin facing surface side B2, so that the absorbent core 40 is not easily twisted or liquid. Since the retractability is ensured at a high level, the wearing feeling and the liquid absorption property of the napkin 1 can be further improved in combination with the action and effect of the convex portion. The raised portion 15 may be formed over the entire length of the excretion portion facing region B of the absorbent core 40 in the lateral direction Y. Further, the raised portion 15 may extend from the excretion portion facing region B to the anterior region A and / or the posterior region C.

吸収性コア40において、繊維塊11と吸水性繊維12Fとの含有質量比は、前述した繊維塊占有率の特定範囲を満たすことを前提として特に限定されず、繊維塊11の構成繊維(合成繊維)11F及び吸水性繊維12Fの種類等に応じて適宜調整すればよい。例えば、繊維塊11の構成繊維11Fが熱可塑性繊維(非吸水性の合成繊維)、吸水性繊維12Fがセルロース系の吸水性繊維である場合、本発明の所定の効果をより確実に奏させるようにする観点から、繊維塊11と吸水性繊維12Fとの含有質量比は、前者(繊維塊11)/後者(吸水性繊維12F)として、好ましくは20/80〜80/20、より好ましくは40/60〜60/40である。 In the absorbent core 40, the content mass ratio of the fiber mass 11 and the water-absorbent fiber 12F is not particularly limited on the premise that the above-mentioned specific range of the fiber mass occupancy is satisfied, and the constituent fibers (synthetic fiber) of the fiber mass 11 are not particularly limited. ) It may be adjusted appropriately according to the type of 11F and the water-absorbent fiber 12F. For example, when the constituent fibers 11F of the fiber mass 11 are thermoplastic fibers (non-water-absorbent synthetic fibers) and the water-absorbent fibers 12F are cellulose-based water-absorbent fibers, the predetermined effects of the present invention can be more reliably achieved. The content mass ratio of the fiber mass 11 and the water-absorbent fiber 12F is preferably 20/80 to 80/20, more preferably 40, as the former (fiber mass 11) / the latter (water-absorbent fiber 12F). It is / 60 to 60/40.

吸収性コア40における繊維塊11の含有量は、乾燥状態の吸収性コア40の全質量に対して、好ましくは20質量%以上、より好ましくは40質量%以上、そして、好ましくは80質量%以下、より好ましくは60質量%以下である。
吸収性コア40における吸水性繊維12Fの含有量は、乾燥状態の吸収性コア40の全質量に対して、好ましくは20質量%以上、より好ましくは40質量%以上、そして、好ましくは80質量%以下、より好ましくは60質量%以下である。
吸収性コア40における吸水性ポリマー13の含有量は、乾燥状態の吸収性コア40の全質量に対して、好ましくは1質量%以上、より好ましくは5質量%以上、そして、好ましくは80質量%以下、より好ましくは50質量%以下である。
なお、ここでいう「乾燥状態の吸収性コア」とは、体液を吸収する前の吸収性コアを意味する。
The content of the fiber mass 11 in the absorbent core 40 is preferably 20% by mass or more, more preferably 40% by mass or more, and preferably 80% by mass or less, based on the total mass of the absorbent core 40 in the dry state. , More preferably 60% by mass or less.
The content of the water-absorbent fiber 12F in the absorbent core 40 is preferably 20% by mass or more, more preferably 40% by mass or more, and preferably 80% by mass with respect to the total mass of the absorbent core 40 in the dry state. Hereinafter, it is more preferably 60% by mass or less.
The content of the water-absorbent polymer 13 in the absorbent core 40 is preferably 1% by mass or more, more preferably 5% by mass or more, and preferably 80% by mass, based on the total mass of the dry absorbent core 40. Hereinafter, it is more preferably 50% by mass or less.
The "dry absorbable core" as used herein means an absorbable core before absorbing body fluids.

吸収性コア40における繊維塊11の坪量は、好ましくは32g/m以上、より好ましくは80g/m以上、そして、好ましくは640g/m以下、より好ましくは480g/m以下である。
吸収性コア40における吸水性繊維12Fの坪量は、好ましくは32g/m以上、より好ましくは80g/m以上、そして、好ましくは640g/m以下、より好ましくは480g/m以下である。
吸収性コア40における吸水性ポリマー13の坪量は、好ましくは5g/m以上、より好ましくは10g/m以上、そして、好ましくは200g/m以下、より好ましくは100g/m以下である。
The basis weight of the fiber mass 11 in the absorbent core 40 is preferably 32 g / m 2 or more, more preferably 80 g / m 2 or more, and preferably 640 g / m 2 or less, more preferably 480 g / m 2 or less. ..
The basis weight of the water-absorbent fiber 12F in the absorbent core 40 is preferably 32 g / m 2 or more, more preferably 80 g / m 2 or more, and preferably 640 g / m 2 or less, more preferably 480 g / m 2 or less. is there.
The basis weight of the water-absorbent polymer 13 in the absorbent core 40 is preferably 5 g / m 2 or more, more preferably 10 g / m 2 or more, and preferably 200 g / m 2 or less, more preferably 100 g / m 2 or less. is there.

吸収性コア40は、回転ドラムを備えた公知の積繊装置を用いて常法に従って製造することができる。積繊装置は、典型的には、外周面に集積用凹部が形成された回転ドラムと、該集積用凹部にコア形成材料(繊維塊11、吸水性繊維12F、吸水性ポリマー13)を搬送する流路を内部に有するダクトとを備え、該回転ドラムをそのドラム周方向に沿って回転軸周りに回転させつつ、該回転ドラムの内部側からの吸引によって該流路に生じた空気流に乗って搬送されたコア形成材料を、該集積用凹部に積繊させるようになされている。斯かる積繊工程によって集積用凹部内に形成される積繊物は、吸収性コア40である。前述した吸収性コア40におけるコア形成材料の特定配置は、前記積繊装置を用いた製造方法において、各コア形成材料の回転ドラム上での積繊順序などを適宜調整することで実現可能である。吸収性コア40の坪量は、好ましくは100g/m以上、より好ましくは200g/m以上、そして、好ましくは800g/m以下、より好ましくは600g/m以下である。 The absorbent core 40 can be manufactured according to a conventional method using a known fiber stacking device equipped with a rotating drum. The fiber stacking device typically conveys a rotating drum having an accumulation recess formed on the outer peripheral surface, and a core forming material (fiber mass 11, water-absorbent fiber 12F, water-absorbent polymer 13) in the accumulation recess. It is provided with a duct having a flow path inside, and while rotating the rotating drum around a rotation axis along the circumferential direction of the drum, it rides on an air flow generated in the flow path by suction from the inside side of the rotating drum. The core-forming material transported in the above direction is made to be stacked in the accumulation recess. The fiber stack formed in the accumulation recess by the fiber stacking step is the absorbent core 40. The specific arrangement of the core forming material in the absorbent core 40 described above can be realized by appropriately adjusting the fiber stacking order of each core forming material on the rotating drum in the manufacturing method using the fiber stacking device. .. The basis weight of the absorbent core 40 is preferably 100 g / m 2 or more, more preferably 200 g / m 2 or more, and preferably 800 g / m 2 or less, more preferably 600 g / m 2 or less.

公知の積繊装置を用いて本発明に係る吸収体(繊維塊が厚み方向で偏在している吸収体)を製造する方法としては、例えば、以下の2つの方法が挙げられる。
1)2台の積繊装置を用い、一方の積繊装置で製造した積繊体と、他方の積繊装置で製造した積繊体とを重ねて一体化する方法(以下、「第1の製造方法」ともいう。)。
2)1台の積繊装置を用い、繊維塊の集積用凹部への供給タイミングと吸水性繊維のそれとを異ならせる方法(以下、「第2の製造方法」ともいう。)。
Examples of a method for producing an absorber (absorbent in which fiber lumps are unevenly distributed in the thickness direction) according to the present invention using a known fiber stacking device include the following two methods.
1) A method in which two fiber stacking devices are used to superimpose and integrate a fiber stack manufactured by one fiber stacking device and a fiber stack manufactured by the other fiber stacking device (hereinafter, "first". Also called "manufacturing method").
2) A method of using one fiber stacking device to make the timing of supplying the fiber mass to the recess for accumulation different from that of the water-absorbent fiber (hereinafter, also referred to as "second manufacturing method").

前記第1の製造方法では、まず、コア形成材料として吸水性繊維と、必要に応じて吸水性ポリマーとを用い、該コア形成材料を第1の積繊装置の集積用凹部に集積して吸水性繊維積繊体を製造する。前記吸水性繊維積繊体は、吸収性コア40の吸水性繊維リッチ部位12Pに相当し得る。またこれとは別に、コア形成材料として繊維塊を用い、該コア形成材料を第2の積繊装置の集積用凹部に集積して繊維塊積繊体を製造する。前記繊維塊積繊体は、吸収性コア40の繊維塊リッチ部位11Pに相当し得る。次いで、前記吸水性繊維積繊体と前記繊維塊積繊体とを重ねて積層体を得、該積層体を厚み方向に加圧することで一体化する。これとは別の一体化方法として、公知のバキュームコンベアの如き吸引手段を用い、該吸引手段の吸引面上に前記吸水性繊維積繊体を置き、該吸引面の吸引力が作用している状態で、該吸水性繊維積繊体上に前記繊維塊積繊体を重ねて一体化する。いずれの一体化方法であっても、吸水性繊維積繊体と繊維塊積繊体との界面では吸水性繊維と繊維塊とに交絡が生じる。こうして本発明に係る吸収体(吸収性コア40の排泄部対向領域B)を得る。 In the first manufacturing method, first, a water-absorbent fiber and, if necessary, a water-absorbent polymer are used as the core-forming material, and the core-forming material is accumulated in the accumulation recess of the first fiber stacking apparatus to absorb water. Manufactures sex fiber polymers. The water-absorbent fiber product fiber body may correspond to the water-absorbent fiber-rich portion 12P of the absorbent core 40. Separately from this, a fiber mass is used as the core forming material, and the core forming material is accumulated in the accumulation recess of the second fiber stacking apparatus to produce a fiber mass stacking fiber. The fiber mass product fiber body may correspond to the fiber mass rich portion 11P of the absorbent core 40. Next, the water-absorbent fiber stacking fiber body and the fiber mass stacking fiber body are laminated to obtain a laminated body, and the laminated body is integrated by pressurizing in the thickness direction. As another integration method, a suction means such as a known vacuum conveyor is used, the water-absorbent fiber densifying fiber is placed on the suction surface of the suction means, and the suction force of the suction surface acts. In this state, the fiber mass stacking fiber is laminated and integrated on the water-absorbent fiber stacking fiber. Regardless of the integration method, entanglement occurs between the water-absorbent fiber and the fiber mass at the interface between the water-absorbent fiber stack and the fiber mass stack. In this way, the absorber according to the present invention (area B facing the excretion portion of the absorbent core 40) is obtained.

前記第2の製造方法では、積繊装置として、集積用凹部の吸引力が部分的に異なるものを使用する。例えば、集積用凹部が、低吸引凹部と、該低吸引凹部よりも吸引力が高い高吸引凹部とを有するものを使用する。前記低吸引凹部と前記高吸引凹部とは、積繊装置が有する回転ドラムの回転方向(周方向)に連接されている。そして、斯かる構成の積繊装置を稼働させ、回転ドラムを周方向に回転させて集積用凹部を一方向に搬送させつつ、該回転ドラムの内部側からの吸引によって該回転ドラムの外部から該集積用凹部に向かう空気流を生じさせ、該空気流によってコア形成材料を該集積用凹部に供給し集積する(集積工程)。前記集積工程においては、まず、繊維塊を集積用凹部に供給し集積させる。このとき、繊維塊は前記高吸引凹部に集中的に集積され、該高吸引凹部に繊維塊積繊体が形成される。次いで、斯かる繊維塊の集積後又は集積途中に、吸水性繊維と、必要に応じ吸水性ポリマーとを集積用凹部に供給し集積させる。このとき、吸水性繊維(吸水性ポリマー)は、集積用凹部における前記低吸引凹部に集積されるとともに、前記高吸引凹部に集積された繊維塊上にも集積され、つまり集積用凹部の全域に吸水性繊維積繊体が形成される。なお、繊維塊は通気性を有しているので、前記高吸引凹部に繊維塊が集積された状態でも、その集積された繊維塊上に吸水性繊維を吸引し得る吸引力が作用しており、前記高吸引凹部に集積された繊維塊上に吸水性繊維(吸水性ポリマー)を重ねて集積することができる。こうして前記高吸引凹部に、前記繊維塊積繊体と前記吸水性繊維積繊体との積層体が形成され、両積繊体の界面では、繊維塊と吸水性繊維とに交絡が生じる。こうして本発明に係る吸収体(吸収性コア40の排泄部対向領域B)を得る。 In the second manufacturing method, as the fiber stacking device, a device having a partially different suction force of the accumulation recess is used. For example, an accumulation recess having a low suction recess and a high suction recess having a higher suction force than the low suction recess is used. The low suction recess and the high suction recess are connected in the rotation direction (circumferential direction) of the rotary drum of the fiber stacking device. Then, the fiber stacking device having such a configuration is operated, the rotating drum is rotated in the circumferential direction to convey the accumulation recess in one direction, and the suction from the inside of the rotating drum is performed from the outside of the rotating drum. An air flow toward the accumulation recess is generated, and the core forming material is supplied to the accumulation recess and accumulated by the air flow (accumulation step). In the accumulation step, first, the fiber mass is supplied to the accumulation recess and accumulated. At this time, the fiber lumps are concentrated in the high suction recess, and the fiber lump stacking fiber is formed in the high suction recess. Then, after or during the accumulation of such fiber lumps, the water-absorbent fiber and, if necessary, the water-absorbent polymer are supplied to the accumulation recess and accumulated. At this time, the water-absorbent fibers (water-absorbent polymer) are accumulated in the low suction recesses in the accumulation recesses and also on the fiber lumps accumulated in the high suction recesses, that is, in the entire area of the accumulation recesses. A water-absorbent fiber stack is formed. Since the fiber mass has breathability, even in a state where the fiber mass is accumulated in the superabsorbent recess, a suction force capable of sucking the water-absorbent fiber acts on the accumulated fiber mass. , The water-absorbent fiber (water-absorbent polymer) can be laminated and accumulated on the fiber mass accumulated in the high suction recess. In this way, a laminate of the fiber mass and the water-absorbent fiber stack is formed in the high suction recess, and entanglement occurs between the fiber mass and the water-absorbent fiber at the interface between the fiber mass. In this way, the absorber according to the present invention (area B facing the excretion portion of the absorbent core 40) is obtained.

以下、繊維塊11について更に説明する。図6には、繊維塊11の典型的な外形形状が2つ示されている。図6(a)に示す繊維塊11Aは四角柱形状より具体的には直方体形状をなし、図6(b)に示す繊維塊11Bは円盤形状をなしている。繊維塊11A,11Bは、相対向する2つの基本面(base plane)111と、該2つの基本面111を連結する骨格面(body plane)112とを備えている点で共通する。基本面111及び骨格面112はいずれも、この種の繊維を主体とする物品における表面の凹凸度合いを評価する際に適用されるレベルで、実質的に凹凸が無いと認められる部分である。 Hereinafter, the fiber mass 11 will be further described. FIG. 6 shows two typical outer shapes of the fiber mass 11. The fiber mass 11A shown in FIG. 6 (a) has a rectangular parallelepiped shape rather than a square column shape, and the fiber mass 11B shown in FIG. 6 (b) has a disk shape. The fiber lumps 11A and 11B are common in that they include two opposing base planes 111 and a skeleton plane 112 connecting the two base planes 111. Both the basic surface 111 and the skeleton surface 112 are at a level applied when evaluating the degree of surface unevenness in an article mainly composed of this type of fiber, and are portions where it is recognized that there is substantially no unevenness.

図6(a)の直方体形状の繊維塊11Aは、6つの平坦面を有しているところ、その6面のうち、最大面積を有する相対向する2面がそれぞれ基本面111であり、残りの4面がそれぞれ骨格面112である。基本面111と骨格面112とは互いに交差、より具体的には直交している。
図6(b)の円盤形状の繊維塊11Bは、平面視円形状の相対向する2つの平坦面と、両平坦面を連結する湾曲した周面とを有しているところ、該2つの平坦面がそれぞれ基本面111であり、該周面が骨格面112である。
繊維塊11A,11Bは、骨格面112が平面視において四角形形状、より具体的には長方形形状をなしている点でも共通する。
The rectangular parallelepiped-shaped fiber mass 11A of FIG. 6A has six flat surfaces, of which two opposing surfaces having the maximum area are basic surfaces 111, and the remaining two surfaces. Each of the four surfaces is a skeletal surface 112. The basic surface 111 and the skeleton surface 112 intersect with each other, and more specifically, are orthogonal to each other.
The disk-shaped fiber mass 11B of FIG. 6B has two flat surfaces facing each other in a circular shape in a plan view and a curved peripheral surface connecting the two flat surfaces. The two flat surfaces are formed. Each surface is a basic surface 111, and the peripheral surface is a skeleton surface 112.
The fiber lumps 11A and 11B are also common in that the skeleton surface 112 has a quadrangular shape, more specifically, a rectangular shape in a plan view.

吸収性コア40に含有される複数の繊維塊11は、それぞれ、図6に示す繊維塊11A,11Bのような、2つの対向する基本面111と両基本面111を連結する骨格面112とを備えた「定形の繊維集合体」である点で、前述した従来技術における不定形の繊維集合体と異なる。換言すれば、吸収性コア40中の任意の1個の繊維塊11を透視した場合(例えば電子顕微鏡で観察した場合)、その繊維塊11の透視形状はその観察角度によって異なり、1個の繊維塊11につき多数の透視形状が存在するところ、吸収性コア40中の複数の繊維塊11それぞれは、その多数の透視形状の1つとして、2つの対向する基本面111と両基本面111を連結する骨格面112とを備えた特定透視形状を有する。前述した従来技術における不定形の繊維集合体は、基本面111や骨格面112のような「面」、すなわち広がりのある部分を実質的に有しておらず、互いに外形形状が異なっていて「定形」ではない。 The plurality of fiber lumps 11 contained in the absorbent core 40 each have two opposing basic surfaces 111 and a skeleton surface 112 connecting both basic surfaces 111, such as the fiber lumps 11A and 11B shown in FIG. It differs from the above-mentioned amorphous fiber aggregate in the prior art in that it is a provided "standard fiber aggregate". In other words, when any one fiber mass 11 in the absorbent core 40 is seen through (for example, when observed with an electron microscope), the perspective shape of the fiber mass 11 differs depending on the observation angle, and one fiber. Where there are a large number of perspective shapes per mass 11, each of the plurality of fiber masses 11 in the absorbent core 40 connects two opposing basic surfaces 111 and both basic surfaces 111 as one of the many perspective shapes. It has a specific perspective shape provided with a skeletal surface 112. The amorphous fiber aggregates in the above-mentioned prior art do not substantially have "planes" such as the basic surface 111 and the skeleton surface 112, that is, widened portions, and have different outer shapes from each other. It is not a fixed form.

このように、吸収性コア40に含まれている複数の繊維塊11が、基本面111と骨格面112とで画成された「定形の繊維集合体」であると、不定形の繊維集合体である場合に比して、吸収性コア40における繊維塊11の均一分散性が向上するため、繊維塊11の如き繊維集合体を吸収性コア40に配合することで期待される効果(吸収体の柔軟性、クッション性、圧縮回復性などの向上効果)がより安定的に発現するようになる。また特に、図6(a)に示す如き直方体形状の繊維塊11の場合、その外面が2つの基本面111と4つの骨格面112との6つの面からなるため、他の繊維塊11あるいは吸水性繊維12Fとの接触機会を比較的多く持つことが可能となり、交絡性が高まって、保形性等の向上にも繋がり得る。 As described above, if the plurality of fiber lumps 11 contained in the absorbent core 40 are "standard fiber aggregates" defined by the basic surface 111 and the skeleton surface 112, the irregular fiber aggregates Since the uniform dispersibility of the fiber mass 11 in the absorbent core 40 is improved as compared with the case of the above, the expected effect (absorbent body) by blending the fiber aggregate such as the fiber mass 11 in the absorbent core 40. (Improvement effect of flexibility, cushioning property, compression recovery property, etc.) will be more stably expressed. In particular, in the case of the rectangular parallelepiped-shaped fiber mass 11 as shown in FIG. 6A, since the outer surface thereof is composed of six surfaces of two basic surfaces 111 and four skeleton surfaces 112, the other fiber mass 11 or water absorption. It is possible to have a relatively large number of contact opportunities with the sex fiber 12F, the entanglement is enhanced, and the shape retention and the like can be improved.

繊維塊11において、2つの基本面111の総面積は、骨格面112の総面積よりも大きいことが好ましい。すなわち、図6(a)の直方体形状の繊維塊11Aにおいては、2つの基本面111それぞれの面積の総和は、4つの骨格面112それぞれの面積の総和よりも大きく、また、図6(b)の円盤形状の繊維塊11Bにおいては、2つの基本面111それぞれの面積の総和は、円盤形状の繊維塊11Bの周面を形成する骨格面112の面積よりも大きい。繊維塊11A,11Bのいずれにおいても、基本面111は、繊維塊11A,11Bが有する複数の面のうちで面積が最大の面である。 In the fiber mass 11, the total area of the two basic surfaces 111 is preferably larger than the total area of the skeleton surface 112. That is, in the rectangular parallelepiped fiber mass 11A of FIG. 6A, the total area of each of the two basic surfaces 111 is larger than the total area of each of the four skeleton surfaces 112, and FIG. 6B In the disk-shaped fiber mass 11B, the total area of each of the two basic surfaces 111 is larger than the area of the skeleton surface 112 forming the peripheral surface of the disk-shaped fiber mass 11B. In any of the fiber lumps 11A and 11B, the basic surface 111 is the surface having the largest area among the plurality of surfaces of the fiber lumps 11A and 11B.

このような、2つの基本面111と両基本面111に交差する骨格面112とで画成された「定形の繊維集合体」である繊維塊11は、従来技術とは異なる製造方法で製造されるものである。繊維塊11の好ましい製造方法は、図7に示すように、原料となる原料繊維シート10bsを、カッターなどの切断手段を用いて定形に切断する工程を有する。原料繊維シート10bsは、繊維塊11と同組成で且つ繊維塊11よりも寸法が大きいシートであり、好ましくは不織布である。斯かる工程を経て製造された複数の繊維塊11は、その形状及び寸法が、従来技術によって製造された不定形の繊維集合体と比較して、より定形的に揃っている。図7は、図6(a)の直方体形状の繊維塊11Aの製造方法を説明した図であり、図7中の点線は切断線を示している。吸収性コア40には、このように繊維シートを定形に切断して得られた、形状及び寸法が均一な複数の繊維塊11が配合されている。 The fiber mass 11 which is a "standard fiber aggregate" defined by the two basic surfaces 111 and the skeleton surface 112 intersecting both basic surfaces 111 is manufactured by a manufacturing method different from the prior art. It is a thing. As shown in FIG. 7, a preferred method for producing the fiber mass 11 includes a step of cutting the raw material fiber sheet 10bs, which is a raw material, into a fixed shape by using a cutting means such as a cutter. The raw material fiber sheet 10bs is a sheet having the same composition as the fiber mass 11 and having a larger size than the fiber mass 11, and is preferably a non-woven fabric. The plurality of fiber ingots 11 produced through such steps have a more fixed shape and dimensions as compared with the amorphous fiber aggregate produced by the prior art. FIG. 7 is a diagram illustrating a method for manufacturing the rectangular parallelepiped-shaped fiber block 11A of FIG. 6A, and the dotted line in FIG. 7 indicates a cutting line. The absorbent core 40 is blended with a plurality of fiber lumps 11 having a uniform shape and size obtained by cutting the fiber sheet into a fixed shape in this way.

図6(a)の直方体形状の繊維塊11Aは、図7に示すように原料繊維シート10bsを、第1方向D1と該第1方向D1に交差(より具体的には直交)する第2方向D2とに所定の長さで切断することで製造される。両方向D1,D2は、それぞれ、シート10bsの面方向における所定の一方向であり、シート10bsは該面方向と直交する厚み方向Zに沿って切断される。このように、原料繊維シート10bsをいわゆる賽の目状に切断して得られる複数の直方体形状の繊維塊11Aにおいては通常、その切断面すなわちシート10bsの切断時においてカッターなどの切断手段と接触する面が、骨格面112であり、非切断面すなわち該切断手段と接触しない面が、基本面111である。基本面111は、シート10bsにおける表裏面(厚み方向Zと直交する面)であり、また前述したとおり、繊維塊11Aが有する複数の面のうちで面積が最大の面である。 As shown in FIG. 7, the rectangular parallelepiped-shaped fiber mass 11A of FIG. 6A intersects (more specifically, orthogonally) the first direction D1 and the first direction D1 with the raw material fiber sheet 10bs in the second direction. It is manufactured by cutting into D2 to a predetermined length. Both directions D1 and D2 are each a predetermined direction in the plane direction of the sheet 10bs, and the sheet 10bs is cut along the thickness direction Z orthogonal to the plane direction. As described above, in the plurality of rectangular parallelepiped-shaped fiber lumps 11A obtained by cutting the raw material fiber sheet 10bs into a so-called grain shape, the cut surface, that is, the surface that comes into contact with a cutting means such as a cutter when cutting the sheet 10bs is usually formed. The skeleton surface 112, that is, the non-cut surface, that is, the surface that does not come into contact with the cutting means, is the basic surface 111. The basic surface 111 is a front and back surface (a surface orthogonal to the thickness direction Z) of the sheet 10bs, and as described above, is the surface having the largest area among the plurality of surfaces of the fiber mass 11A.

なお、以上の繊維塊11Aについての説明は、図6(b)の円盤形状の繊維塊11Bにも基本的に当てはまる。繊維塊11Aとの実質的な違いは、原料繊維シート10bsの切断パターンのみであり、シート10bsを定形に切断して繊維塊11Bを得る際には、繊維塊11Bの平面視形状に合わせて、シート10bsを円形状に切断すればよい。 The above description of the fiber mass 11A basically applies to the disk-shaped fiber mass 11B of FIG. 6B. The only substantial difference from the fiber mass 11A is the cutting pattern of the raw material fiber sheet 10bs, and when the sheet 10bs is cut into a fixed shape to obtain the fiber mass 11B, the fiber mass 11B is matched with the plan view shape. The sheet 10bs may be cut into a circular shape.

また、繊維塊11の外形形状は図6に示すものに限定されず、基本面111及び骨格面112はいずれも、図6(a)の各面111,112のように湾曲していない平坦面でもよく、あるいは図6(b)の骨格面112(円盤形状の繊維塊11Bの周面)のように湾曲面でもよい。また、基本面111と骨格面112とは互いに同形状同寸法であってもよく、具体的には例えば、繊維塊11Aの外形形状は立方体形状であってもよい。 Further, the outer shape of the fiber mass 11 is not limited to that shown in FIG. 6, and the basic surface 111 and the skeleton surface 112 are both flat surfaces that are not curved as in the surfaces 111 and 112 of FIG. 6A. Alternatively, it may be a curved surface such as the skeleton surface 112 (the peripheral surface of the disk-shaped fiber mass 11B) in FIG. 6 (b). Further, the basic surface 111 and the skeleton surface 112 may have the same shape and the same dimensions, and specifically, for example, the outer shape of the fiber mass 11A may be a cubic shape.

繊維塊11のサイズは特に制限されず、吸収性コア40のクッション性、通液性などを考慮して適宜設定し得る。繊維塊11が有する複数の面のうちで面積が最大の面である、基本面111の面積は、繊維塊11のサイズの指標となり得る。繊維塊11の基本面111の面積は、好ましくは1mm以上、より好ましくは5mm以上、そして、好ましくは100mm以下、より好ましくは50mm以下である。 The size of the fiber mass 11 is not particularly limited, and can be appropriately set in consideration of the cushioning property, the liquid permeability, and the like of the absorbent core 40. The area of the basic surface 111, which has the largest area among the plurality of surfaces of the fiber mass 11, can be an index of the size of the fiber mass 11. The area of the basic surface 111 of the fiber mass 11 is preferably 1 mm 2 or more, more preferably 5 mm 2 or more, and preferably 100 mm 2 or less, more preferably 50 mm 2 or less.

好ましい繊維塊11として、基本面111のアスペクト比が1又は1に近いもの、すなわち基本面111の平面視形状が正方形又はそれに準じる形状のものが挙げられる。斯かる繊維塊11を吸収性コア40に用いると、吸収性コア40が嵩高くなる傾向があり、クッション性等が向上し得る。 Preferred fiber lumps 11 include those in which the aspect ratio of the basic surface 111 is 1 or close to 1, that is, the shape of the basic surface 111 in a plan view is square or similar. When such a fiber mass 11 is used for the absorbent core 40, the absorbent core 40 tends to be bulky, and the cushioning property and the like can be improved.

基本面111のアスペクト比は、基本面111の平面視形状が四角形の場合は、その四角形の基本面111を画成する互いに直交する2辺の長さの比率として求められる。その2辺の長さが同じであれば、平面視四角形形状の基本面111のアスペクト比は1となり、2辺の長さが互いに異なる場合、すなわち基本面111の平面視形状が図6(a)に示す如き長方形の場合は、短辺111aの長さL1に対する長辺111bの長さL2の比率(L2/L1)として求められる。また、図6(b)に示す繊維塊11Bのように、基本面111の平面視形状が四角形でない場合は、基本面111の中心(重心)を通って互いに直交する2本の軸の長さの比率として求められる。その2本の軸の長さが同じであれば、平面視非四角形形状の基本面111のアスペクト比は1となり、2本の軸の長さが互いに異なる場合、すなわち相対的に長さの短い短軸と相対的に長さの長い長軸とが存在する場合は、短軸の長さに対する長軸の長さ(図6(b)の符号L2で示す長さ)の比率(後者/前者)として求められる。 When the plane view shape of the basic surface 111 is a quadrangle, the aspect ratio of the basic surface 111 is obtained as a ratio of the lengths of two orthogonal sides forming the basic surface 111 of the quadrangle. If the lengths of the two sides are the same, the aspect ratio of the basic surface 111 having a rectangular shape in a plan view is 1, and if the lengths of the two sides are different from each other, that is, the plan view shape of the basic surface 111 is shown in FIG. 6 (a). In the case of a rectangle as shown in), it is obtained as the ratio (L2 / L1) of the length L2 of the long side 111b to the length L1 of the short side 111a. Further, when the plan view shape of the basic surface 111 is not quadrangular as in the fiber mass 11B shown in FIG. 6B, the lengths of the two axes orthogonal to each other through the center (center of gravity) of the basic surface 111. It is calculated as the ratio of. If the lengths of the two axes are the same, the aspect ratio of the basic surface 111 of the non-square shape in plan view is 1, and if the lengths of the two axes are different from each other, that is, the lengths are relatively short. When there is a minor axis and a long axis having a relatively long length, the ratio of the length of the major axis (the length indicated by the reference numeral L2 in FIG. 6B) to the length of the minor axis (the latter / the former). ).

繊維塊11(11A,11B)の各部の寸法等は、例えば、以下のように設定することができる。繊維塊11の各部の寸法は、繊維塊11の電子顕微鏡写真などに基づいて測定することができる。
基本面111が図6(a)に示す如き平面視長方形形状の場合、その短辺111aの長さL1は、好ましくは0.1mm以上、より好ましくは0.3mm以上、更に好ましくは0.5mm以上、そして、好ましくは10mm以下、より好ましくは6mm以下、更に好ましくは5mm以下である。
平面視長方形形状の基本面111の長辺111bの長さL2は、好ましくは0.3mm以上、より好ましくは1mm以上、更に好ましくは2mm以上、そして、好ましくは30mm以下、より好ましくは15mm以下、更に好ましくは10mm以下である。
なお、基本面111が図6に示すように、繊維塊11が有する複数の面のうちで最大面積を有する面である場合、長辺111bの長さL2は、繊維塊11の最大差し渡し長さ(長軸の長さ)に一致し、該最大差し渡し長さは、円盤形状の繊維塊11Bにおける平面視円形状の基本面111の直径に一致する。
繊維塊11の厚みT、すなわち2つの対向する基本面111間の長さTは、好ましくは0.1mm以上、より好ましくは0.3mm以上、そして、好ましくは10mm以下、より好ましくは6mm以下である。
The dimensions and the like of each part of the fiber mass 11 (11A, 11B) can be set as follows, for example. The dimensions of each part of the fiber mass 11 can be measured based on an electron micrograph of the fiber mass 11 or the like.
When the basic surface 111 has a rectangular shape in a plan view as shown in FIG. 6A, the length L1 of the short side 111a is preferably 0.1 mm or more, more preferably 0.3 mm or more, still more preferably 0.5 mm. The above, preferably 10 mm or less, more preferably 6 mm or less, still more preferably 5 mm or less.
The length L2 of the long side 111b of the basic surface 111 having a rectangular shape in a plan view is preferably 0.3 mm or more, more preferably 1 mm or more, further preferably 2 mm or more, and preferably 30 mm or less, more preferably 15 mm or less. More preferably, it is 10 mm or less.
As shown in FIG. 6, when the basic surface 111 is the surface having the maximum area among the plurality of surfaces of the fiber mass 11, the length L2 of the long side 111b is the maximum transfer length of the fiber mass 11. It corresponds to (the length of the major axis), and the maximum transfer length corresponds to the diameter of the plane-view circular basic surface 111 in the disk-shaped fiber block 11B.
The thickness T of the fiber mass 11, that is, the length T between the two opposing basic surfaces 111 is preferably 0.1 mm or more, more preferably 0.3 mm or more, and preferably 10 mm or less, more preferably 6 mm or less. is there.

前述したように、繊維塊11(11A,11B)が有する2種類の面(基本面111、骨格面112)は、繊維塊11を製造する際のカッターなどの切断手段による原料繊維シート10bsの切断によって形成される切断面(骨格面112)と、シート10bsが本来的に有する面であって該切断手段とは接触しない非切断面(基本面111)とに分類される。そして、この切断面か否かの違いに起因して、切断面である骨格面112は、非切断面である基本面111に比して、繊維端部の単位面積当たりの数が多いという特徴を有する。ここでいう「繊維端部」とは、繊維塊11の構成繊維11Fの長さ方向端部を意味する。通常、非切断面である基本面111にも繊維端部は存在するが、骨格面112は、原料繊維シート10bsの切断によって形成された切断面であることに起因して、その切断によって形成された構成繊維11Fの切断端部からなる繊維端部が、骨格面112の全体に多数存在しており、つまり、繊維端部の単位面積当たりの数が基本面111のそれよりも多くなっている。 As described above, the two types of surfaces (basic surface 111 and skeleton surface 112) of the fiber mass 11 (11A, 11B) are the cutting of the raw material fiber sheet 10bs by a cutting means such as a cutter when manufacturing the fiber mass 11. It is classified into a cut surface (skeleton surface 112) formed by the sheet 10bs and a non-cut surface (basic surface 111) that is inherently possessed by the sheet 10bs and does not come into contact with the cutting means. The skeleton surface 112, which is a cut surface, has a larger number of fiber ends per unit area than the basic surface 111, which is a non-cut surface, due to the difference in whether or not the cut surface is used. Has. The "fiber end" as used herein means the end in the length direction of the constituent fibers 11F of the fiber mass 11. Normally, the fiber end portion is also present on the basic surface 111, which is a non-cut surface, but the skeleton surface 112 is formed by cutting the raw material fiber sheet 10bs because it is a cut surface formed by cutting. A large number of fiber ends consisting of cut ends of the constituent fibers 11F are present throughout the skeleton surface 112, that is, the number of fiber ends per unit area is larger than that of the basic surface 111. ..

繊維塊11の各面(基本面111、骨格面112)に存在する繊維端部は、該繊維塊11が、吸収性コア40に含まれる他の繊維塊11や吸水性繊維12Fとの間に交絡を形成するのに有用である。また一般に、繊維端部の単位面積当たりの数が多いほど交絡性が向上し得るので、吸収性コア40の保形性などの諸特性の向上に繋がり得る。そして前述したように、繊維塊11の各面における繊維端部の単位面積当たりの数は均一ではなく、斯かる繊維端部の単位面積当たりの数に関しては「骨格面112>基本面111」なる大小関係が成立することから、繊維塊11を介した他の繊維(他の繊維塊11、吸水性繊維12F)との交絡性は該繊維塊11の面によって異なり、骨格面112は基本面111に比して交絡性が高い。すなわち、骨格面112を介しての他の繊維との交絡による結合の方が、基本面111を介してのそれよりも結合力が強く、1個の繊維塊11において、基本面111と骨格面112とで他の繊維との結合力に差が生じ得る。一般に、斯かる結合力が強いほど、その結合されている繊維の動きの自由度が制限され、吸収性コア40全体として強度(保形性)が向上する反面、柔らかさが低下する傾向がある。 The fiber ends existing on each surface (basic surface 111, skeleton surface 112) of the fiber mass 11 are formed between the fiber mass 11 and another fiber mass 11 included in the absorbent core 40 or the water-absorbent fiber 12F. Useful for forming confounding. Further, in general, the larger the number of fiber ends per unit area, the better the entanglement, which can lead to the improvement of various characteristics such as the shape retention of the absorbent core 40. As described above, the number of fiber ends per unit area on each surface of the fiber mass 11 is not uniform, and the number of such fiber ends per unit area is "skeleton surface 112> basic surface 111". Since the magnitude relationship is established, the entanglement with other fibers (other fiber mass 11, water-absorbent fiber 12F) via the fiber mass 11 differs depending on the surface of the fiber mass 11, and the skeleton surface 112 is the basic surface 111. Highly confounding compared to. That is, the bond by entanglement with other fibers via the skeleton surface 112 has a stronger binding force than that through the basic surface 111, and in one fiber mass 11, the basic surface 111 and the skeleton surface There may be a difference in binding force with other fibers from 112. In general, the stronger the bonding force, the more the degree of freedom of movement of the bonded fibers is limited, and the strength (shape retention) of the absorbent core 40 as a whole tends to increase, but the softness tends to decrease. ..

このように、吸収性コア40においてはそれに含まれている複数の繊維塊11それぞれが、その周辺の他の繊維(他の繊維塊11、吸水性繊維12F)に対して、2種類の結合力を持って交絡しており、これにより吸収性コア40は、適度な柔らかさと強度(保形性)とを兼ね備えたものとなる。そして、このような優れた特性を有する吸収性コア40を、吸収性物品の吸収体として常法に従って用いた場合には、該吸収性物品の着用者に快適な着用感を提供することができるとともに、着用時における着用者の体圧等の外力によって吸収性コア40が破壊される不都合が効果的に防止される。 As described above, in the absorbent core 40, each of the plurality of fiber lumps 11 contained therein has two types of binding forces with respect to other fibers (other fiber lumps 11, water-absorbent fibers 12F) around the absorbent core 40. As a result, the absorbent core 40 has an appropriate softness and strength (shape retention). When the absorbent core 40 having such excellent properties is used as an absorber of the absorbent article according to a conventional method, it is possible to provide a comfortable wearing feeling to the wearer of the absorbent article. At the same time, the inconvenience that the absorbent core 40 is destroyed by an external force such as the wearer's body pressure at the time of wearing is effectively prevented.

特に、図6に示す繊維塊11(11A,11B)は、前述したように、2つの基本面111の総面積が骨格面112の総面積よりも大きい。このため、繊維端部の単位面積当たりの数が相対的に少なく、それ故に他の繊維との交絡性が相対的に低い基本面111の方が、これとは反対の性質を有する骨格面112よりも、総面積が大きいことを意味する。したがって、図6に示す繊維塊11(11A,11B)は、表面全体に繊維端部が均一に存在する繊維塊に比して、周辺の他の繊維(他の繊維塊11、吸水性繊維12F)との交絡が抑制されやすく、また、周辺の他の繊維と交絡するとしても、比較的弱い結合力でもって交絡しやすく、それ故、大きな固まりになり難く、吸収性コア40に優れた柔軟性を付与し得る。 In particular, in the fiber mass 11 (11A, 11B) shown in FIG. 6, the total area of the two basic surfaces 111 is larger than the total area of the skeleton surface 112, as described above. For this reason, the basic surface 111, which has a relatively small number of fiber ends per unit area and therefore has a relatively low confounding property with other fibers, has a skeleton surface 112 having the opposite property. It means that the total area is larger than that. Therefore, the fiber lumps 11 (11A, 11B) shown in FIG. 6 have other fibers (other fiber lumps 11, water-absorbing fibers 12F) in the vicinity as compared with the fiber lumps having fiber ends uniformly present on the entire surface. ) Is easily suppressed, and even if it is entangled with other fibers in the vicinity, it is easy to be entangled with a relatively weak binding force, and therefore it is difficult to form a large lump, and the absorbent core 40 has excellent flexibility. Can impart sex.

繊維塊11の構成繊維11Fは合成繊維を含む。繊維11Fとして使用される合成繊維は、吸水性繊維12Fよりも吸水性が低いもの(弱吸水性)が好ましく、特に非吸水性の合成繊維が好ましい。繊維塊11の構成繊維11Fは合成繊維以外の繊維成分(例えば天然繊維)を含み得るが、繊維塊11の構成繊維11Fが弱親水性の繊維、好ましくは非吸水性繊維を含むことにより、吸収性コア40が乾燥状態である場合のみならず、水分(尿や経血などの体液)を吸収して湿潤状態にある場合でも、前述した繊維塊11の存在に起因する作用効果(保形性、柔軟性、クッション性、圧縮回復性、ヨレにくさなどの向上効果)が安定的に奏されるようになる。繊維塊11における構成繊維11Fとしての合成繊維の含有量は、繊維塊11の全質量に対して、好ましくは90質量%以上であり、100質量%すなわち繊維塊11が合成繊維のみから形成されていることが最も好ましい。特に、構成繊維11Fとしての合成繊維が非吸水性のものである場合に、前述した繊維塊11の存在に起因する作用効果が一層安定的に奏される。 The constituent fibers 11F of the fiber mass 11 include synthetic fibers. The synthetic fiber used as the fiber 11F is preferably one having a lower water absorption (weak water absorption) than the water-absorbent fiber 12F, and particularly a non-water-absorbing synthetic fiber is preferable. The constituent fibers 11F of the fiber mass 11 may contain fiber components other than synthetic fibers (for example, natural fibers), but the constituent fibers 11F of the fiber mass 11 are absorbed by containing weakly hydrophilic fibers, preferably non-water-absorbing fibers. Not only when the sex core 40 is in a dry state, but also when it is in a wet state by absorbing water (body fluid such as urine and menstrual blood), the action and effect (shape retention) due to the presence of the above-mentioned fiber mass 11 , Flexibility, cushioning property, compression recovery property, resistance to twisting, etc.) will be stably achieved. The content of the synthetic fiber as the constituent fiber 11F in the fiber mass 11 is preferably 90% by mass or more with respect to the total mass of the fiber mass 11, and 100% by mass, that is, the fiber mass 11 is formed only from the synthetic fiber. Most preferably. In particular, when the synthetic fiber as the constituent fiber 11F is non-water-absorbent, the action and effect caused by the presence of the above-mentioned fiber mass 11 are more stably exhibited.

本明細書において、「吸水性」という用語は、例えば、パルプは吸水性と言ったように、当業者にとって容易に理解できるものである。同様に、熱可塑性繊維は弱吸水性(特に、非吸水性)であることも、容易に理解され得る。一方で、繊維の吸水性の程度は下記方法により測定される水分率の値によって、相対的な吸水性の違いが比較できるとともに、より好ましい範囲も規定できる。斯かる水分率の値が大きいほど、繊維の吸水性が強い。
吸水性繊維としては、斯かる水分率が6%以上であることが好ましく、より10%以上が好ましい。一方で、合成繊維は、斯かる水分率が6%未満であることが好ましく、4%未満であることがより好ましい。なお、水分率が6%未満の場合、当該繊維は非吸水性繊維と判定できる。
In the present specification, the term "water absorption" is easily understood by those skilled in the art, for example, pulp is said to be water absorbent. Similarly, it can be easily understood that thermoplastic fibers are weakly absorbent (particularly non-absorbent). On the other hand, the degree of water absorption of the fiber can be compared with the relative difference in water absorption by the value of the water content measured by the following method, and a more preferable range can be defined. The larger the value of the water content, the stronger the water absorption of the fiber.
As the water-absorbent fiber, the water content is preferably 6% or more, more preferably 10% or more. On the other hand, the moisture content of the synthetic fiber is preferably less than 6%, more preferably less than 4%. When the water content is less than 6%, the fiber can be determined to be a non-water-absorbent fiber.

<水分率の測定方法>
水分率は、JIS P8203の水分率試験方法を準用して算出した。すなわち、繊維試料を温度40℃、相対湿度80%RHの試験室に24時間静置後、その室内にて絶乾処理前の繊維試料の重量W(g)を測定した。その後、温度105±2℃の電気乾燥機(例えば、株式会社いすゞ製作所製)内にて1時間静置し、繊維試料の絶乾処理を行った。絶乾処理後、温度20±2℃、相対温度65±2%の標準状態の試験室にて、旭化成(株)製サランラップ(登録商標)で繊維試料を包括した状態で、Siシリカゲル(例えば、豊田化工(株))をガラスデシゲータ内(例えば、(株)テックジャム製)に入れて、繊維試料が温度20±2℃になるまで静置する。その後、繊維試料の恒量W’(g)を秤量して、次式により繊維試料の水分率を求める。水分率(%)=(W−W’/W’)×100
<Measurement method of moisture content>
The water content was calculated by applying the water content test method of JIS P8203 mutatis mutandis. That is, after the fiber sample was allowed to stand in a test room having a temperature of 40 ° C. and a relative humidity of 80% RH for 24 hours, the weight W (g) of the fiber sample before the absolute drying treatment was measured in the room. Then, the fiber sample was subjected to an absolute drying treatment by allowing it to stand for 1 hour in an electric dryer having a temperature of 105 ± 2 ° C. (for example, manufactured by Isuzu Motors Ltd.). After the absolute drying treatment, Si silica gel (for example, Si silica gel (for example,)) is used in a standard state test room at a temperature of 20 ± 2 ° C. and a relative temperature of 65 ± 2% with the fiber sample covered with Saran Wrap (registered trademark) manufactured by Asahi Kasei Corporation. Toyoda Kako Co., Ltd. is placed in a glass desigator (for example, manufactured by Tech Jam Co., Ltd.) and allowed to stand until the temperature of the fiber sample reaches 20 ± 2 ° C. Then, the constant amount W'(g) of the fiber sample is weighed, and the water content of the fiber sample is obtained by the following formula. Moisture content (%) = (W-W'/ W') x 100

また同様に、吸収性コア40が乾燥状態及び湿潤状態のいずれの状態でも保形性、柔軟性、クッション性、圧縮回復性、ヨレにくさなどにおいて優れた効果を発現し得るようにする観点から、繊維塊11は、複数の熱可塑性繊維が互いに熱融着した3次元構造を有することが好ましい。 Similarly, from the viewpoint of enabling the absorbent core 40 to exhibit excellent effects in shape retention, flexibility, cushioning property, compression recovery property, resistance to twisting, etc. in both a dry state and a wet state. , The fiber mass 11 preferably has a three-dimensional structure in which a plurality of thermoplastic fibers are heat-sealed to each other.

複数の熱融着部が3次元的に分散した繊維塊11を得るためには、その原料繊維シート10bs(図7参照)が同様に構成されていればよく、また、そのような複数の熱融着部が3次元的に分散した原料繊維シート10bsは、前述したように、熱可塑性繊維を主体とするウエブや不織布に、熱風処理などの熱処理を施すことによって製造することができる。 In order to obtain a fiber mass 11 in which a plurality of heat-sealed portions are three-dimensionally dispersed, the raw material fiber sheets 10bs (see FIG. 7) may be similarly configured, and such a plurality of heats may be obtained. As described above, the raw material fiber sheet 10bs in which the fused portions are three-dimensionally dispersed can be produced by subjecting a web or a non-woven fabric mainly composed of thermoplastic fibers to a heat treatment such as hot air treatment.

繊維塊11の構成繊維11Fの素材として好適な非吸水性の合成樹脂(熱可塑性樹脂)としては、例えば、ポリエチレン、ポリプロピレン等のポリオレフィン;ポリエチレンテレフタレート等のポリエステル;ナイロン6、ナイロン66等のポリアミド;ポリアクリル酸、ポリメタクリル酸アルキルエステル、ポリ塩化ビニル、ポリ塩化ビニリデン等が挙げられ、これらの1種を単独で又は2種以上を組み合わせて用いることができる。なお、繊維11Fは、1種類の合成樹脂(熱可塑性樹脂)又は2種類以上の合成樹脂を混合したブレンドポリマーからなる単一繊維でもよく、あるいは複合繊維でもよい。ここでいう複合繊維は、成分の異なる2種類以上の合成樹脂を紡糸口金で複合し、同時に紡糸して得られる合成繊維(熱可塑性繊維)で、複数の成分がそれぞれ繊維の長さ方向に連続した構造で、単繊維内で相互接着しているものをいう。複合繊維の形態には、芯鞘型、サイドバイサイド型等があり、特に制限されない。 Examples of the non-water-absorbent synthetic resin (thermoplastic resin) suitable as a material for the constituent fibers 11F of the fiber mass 11 include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate; and polyamides such as nylon 6 and nylon 66; Examples thereof include polyacrylic acid, polymethacrylic acid alkyl ester, polyvinyl chloride, polyvinylidene chloride and the like, and one of these can be used alone or in combination of two or more. The fiber 11F may be a single fiber made of one kind of synthetic resin (thermoplastic resin) or a blend polymer in which two or more kinds of synthetic resins are mixed, or may be a composite fiber. The composite fiber referred to here is a synthetic fiber (thermoplastic fiber) obtained by combining two or more kinds of synthetic resins having different components with a spinneret and spinning them at the same time, and a plurality of components are continuous in the length direction of the fiber. A structure that is mutually bonded within a single fiber. The form of the composite fiber includes a core sheath type, a side-by-side type, and the like, and is not particularly limited.

また、繊維塊11は、水との接触角が90度未満、特に70度以下であることが、初期排泄での体液の引き込み性を一層向上させる観点から好ましい。このような繊維としては、前述した非吸水性の合成繊維を、常法に従い親水化剤で処理することによって得られる。親水化剤としては、通常の界面活性剤を使用することができる。 Further, it is preferable that the fiber mass 11 has a contact angle with water of less than 90 degrees, particularly 70 degrees or less, from the viewpoint of further improving the pullability of body fluid in the initial excretion. Such fibers can be obtained by treating the above-mentioned non-water-absorbent synthetic fibers with a hydrophilizing agent according to a conventional method. As the hydrophilizing agent, an ordinary surfactant can be used.

<接触角の測定方法>
測定対象(吸収性コア)から繊維を取り出し、その繊維に対する水の接触角を測定する。測定装置として、協和界面科学株式会社製の自動接触角計MCA−Jを用いる。接触角の測定には脱イオン水を用いる。インクジェット方式水滴吐出部(クラスターテクノロジー社製、吐出部孔径が25μmのパルスインジェクターCTC−25)から吐出される液量を20ピコリットルに設定して、水滴を、繊維の真上に滴下する。滴下の様子を水平に設置されたカメラに接続された高速度録画装置に録画する。録画装置は後に画像解析をする観点から、高速度キャプチャー装置が組み込まれたパーソナルコンピュータが望ましい。本測定では、17msec毎に画像が録画される。録画された映像において、繊維に水滴が着滴した最初の画像を、付属ソフトFAMAS(ソフトのバージョンは2.6.2、解析手法は液滴法、解析方法はθ/2法、画像処理アルゴリズムは無反射、画像処理イメージモードはフレーム、スレッシホールドレベルは200、曲率補正はしない、とする)にて画像解析を行い、水滴の空気に触れる面と繊維とのなす角を算出し、接触角とする。測定対象物から取り出した繊維は、繊維長1mmに裁断し、該繊維を接触角計のサンプル台に載せて、水平に維持する。繊維1本につき異なる2箇所の接触角を測定する。N=5本の接触角を小数点以下1桁まで計測し、合計10箇所の測定値を平均した値(小数点以下第2桁で四捨五入)を、当該繊維の水との接触角と定義する。測定環境は、室温22±2℃、湿度65±2%RHとする。
<Measurement method of contact angle>
The fiber is taken out from the measurement target (absorbent core), and the contact angle of water with respect to the fiber is measured. As a measuring device, an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Deionized water is used to measure the contact angle. The amount of liquid discharged from the inkjet type water droplet discharge unit (Pulse injector CTC-25 manufactured by Cluster Technology Co., Ltd., having a discharge unit hole diameter of 25 μm) is set to 20 picolitres, and the water droplet is dropped directly above the fiber. The state of dripping is recorded on a high-speed recording device connected to a horizontally installed camera. From the viewpoint of image analysis later, the recording device is preferably a personal computer incorporating a high-speed capture device. In this measurement, an image is recorded every 17 msec. In the recorded video, the first image of water droplets on the fibers is the attached software FAMAS (software version is 2.6.2, analysis method is sessile drop method, analysis method is θ / 2 method, image processing algorithm. Is non-reflective, the image processing image mode is frame, the threshold level is 200, and the curvature is not corrected.) Image analysis is performed, the angle between the surface of the water droplet in contact with the air and the fiber is calculated, and the contact is made. Make a corner. The fiber taken out from the object to be measured is cut to a fiber length of 1 mm, and the fiber is placed on a sample table of a contact angle meter and maintained horizontally. Measure the contact angles at two different points for each fiber. The contact angle of N = 5 fibers is measured to one digit after the decimal point, and the average value of the measured values at 10 points in total (rounded to the second digit after the decimal point) is defined as the contact angle of the fiber with water. The measurement environment is room temperature 22 ± 2 ° C. and humidity 65 ± 2% RH.

なお、測定対象の吸収体(吸収性コア)が吸収性物品等の他の物品の構成部材として用いられており、該吸収体を取り出して評価測定する場合において、該吸収体が、接着剤、融着などによって他の構成部材に固定されている場合には、その固定部分を、繊維の接触角に影響を与えない範囲で、コールドスプレーの冷風を吹き付ける等の方法で接着力を除去してから取り出す。この手順は、本願明細書中の全ての測定において共通である。 The absorber to be measured (absorbent core) is used as a constituent member of another article such as an absorbent article, and when the absorber is taken out and evaluated and measured, the absorber is an adhesive. When it is fixed to other components by fusion, etc., the adhesive force is removed from the fixed part by blowing cold air from a cold spray within the range that does not affect the contact angle of the fibers. Take out from. This procedure is common to all measurements herein.

以上、本発明をその実施形態に基づいて説明したが、本発明は、前記実施形態に制限されることなく適宜変更が可能である。
例えば、前述した実施形態では吸収体4は、排泄部対向領域Bの少なくとも横方向Yの中央部が他の領域A,Cよりも厚みが大きい肉厚の構造を有するものであったが、排泄部対向領域Bと前後領域A,Cとで吸収体4の厚みが同じであってもよい。この場合は、例えば、均一厚みの吸収性コア40を作製し、その均一厚みの吸収性コア40の排泄部対向領域Bの少なくとも一部の形成材料を排除したのち、排除した厚み分の繊維塊11を補充する等の方法によって、全体の厚みが均一な吸収体4を作製することができる。
本発明の吸収性物品は、人体から排出される体液(尿、軟便、経血、汗等)の吸収に用いられる物品を広く包含し、前述した生理用ナプキンの他、生理用ショーツ、止着テープを有するいわゆる展開型の使い捨ておむつ、パンツ型の使い捨ておむつ、失禁パッド等が包含される。
Although the present invention has been described above based on the embodiment, the present invention can be appropriately modified without being limited to the embodiment.
For example, in the above-described embodiment, the absorber 4 has a wall thickness structure in which at least the central portion of the excretion portion facing region B in the lateral direction Y is thicker than the other regions A and C, but excretion. The thickness of the absorber 4 may be the same in the portion facing region B and the front-rear regions A and C. In this case, for example, an absorbent core 40 having a uniform thickness is produced, and at least a part of the forming material of the excretion portion facing region B of the absorbent core 40 having the uniform thickness is removed, and then the fiber mass having the excluded thickness is removed. An absorber 4 having a uniform overall thickness can be produced by a method such as replenishing 11.
The absorbable article of the present invention broadly includes articles used for absorbing body fluids (urine, loose stool, menstrual blood, sweat, etc.) discharged from the human body, and in addition to the above-mentioned sanitary napkins, sanitary shorts and fastenings. So-called deployable disposable diapers with tape, pants-type disposable diapers, incontinence pads and the like are included.

前述した本発明の実施形態に関し、更に以下の付記を開示する。
<1> 使用者の前後方向に対応する縦方向とこれに直交する横方向とを有し、且つ使用時に使用者の排泄部に対向配置される排泄部対向領域と、該排泄部対向領域よりも縦方向前側に配される前方領域と、該排泄部対向領域よりも縦方向後側に配される後方領域とを有し、吸収体を備えた吸収性物品であって、前記吸収体は、合成繊維を含む繊維塊と、吸水性繊維とを含有し、前記吸収体において、前記繊維塊及び前記吸水性繊維の合計含有質量に対する該繊維塊の含有質量の比率は、前記前方領域及び前記後方領域よりも前記排泄部対向領域の方が大きく、且つ該排泄部対向領域では、該吸収体の非肌対向面側よりも該吸収体の肌対向面側の方が小さい吸収性物品。
<2> 前記吸収体は、前記排泄部対向領域に、該吸収体が含有する全ての前記繊維塊の90質量%以上を含有する、前記<1>に記載の吸収性物品。
<3> 前記吸収体の厚みは、前記排泄部対向領域の横方向中央よりも前記前方領域及び前記後方領域の方が薄い、前記<1>又は<2>に記載の吸収性物品。
<4> 前記吸収体の非肌対向面における前記排泄部対向領域に位置する部分の面積は、該吸収体の非肌対向面の面積の60%以下である、前記<1>〜<3>のいずれか1に記載の吸収性物品。
<5> 前記吸収体は、吸水性ポリマーを少なくとも前記排泄部対向領域に含有し、且つ該吸収体における該吸水性ポリマーの含有量は、前記非肌対向面側よりも前記肌対向面側の方が多い、前記<1>〜<4>いずれか1に記載の吸収性物品。
<6> 前記吸収体は、前記繊維塊及び前記吸水性繊維を含有する吸収性コアと、該吸収性コアの外面を被覆するコアラップシートとを具備する、前記<1>〜<5>のいずれか1に記載の吸収性物品。
<7> 前記吸収体は、前記排泄部対向領域に、周辺部よりも使用者の肌側に向かって隆起した隆起部を有する、前記<1>〜<6>のいずれか1に記載の吸収性物品。
<8> 前記吸収体において、複数の前記繊維塊同士又は該繊維塊と前記吸水性繊維とが互いに交絡している、前記<1>〜<7>のいずれか1に記載の吸収性物品。
The following additional notes are further disclosed with respect to the above-described embodiment of the present invention.
<1> From the excretion part facing area which has a vertical direction corresponding to the front-back direction of the user and a horizontal direction orthogonal to the vertical direction and which is arranged to face the excretion part of the user at the time of use and the excretion part facing area. Is an absorbent article having an anterior region arranged on the front side in the vertical direction and a rear region arranged on the rear side in the vertical direction with respect to the area facing the excretion portion, and the absorber is provided. , A fiber mass containing synthetic fibers and a water-absorbent fiber, and the ratio of the content mass of the fiber mass to the total content mass of the fiber mass and the water-absorbent fiber in the absorber is the front region and the said. An absorbent article in which the excretion portion facing region is larger than the posterior region, and the excretion portion facing region is smaller on the skin facing surface side of the absorber than on the non-skin facing surface side of the absorber.
<2> The absorbent article according to <1>, wherein the absorber contains 90% by mass or more of all the fiber lumps contained in the absorber in the region facing the excretion portion.
<3> The absorbent article according to <1> or <2>, wherein the thickness of the absorber is thinner in the front region and the rear region than in the lateral center of the excretion portion facing region.
<4> The area of the portion of the non-skin facing surface of the absorber located in the excretion portion facing region is 60% or less of the area of the non-skin facing surface of the absorber, <1> to <3>. The absorbent article according to any one of.
<5> The absorber contains at least the water-absorbent polymer in the excretion portion facing region, and the content of the water-absorbing polymer in the absorber is closer to the skin-facing surface side than to the non-skin facing surface side. The absorbent article according to any one of <1> to <4> above, which is more common.
<6> The absorbent body comprises the absorbent core containing the fiber mass and the water-absorbent fiber, and a core wrap sheet covering the outer surface of the absorbent core, according to <1> to <5>. The absorbent article according to any one.
<7> The absorption according to any one of <1> to <6>, wherein the absorber has a raised portion in the area facing the excretion portion, which is raised toward the skin side of the user rather than the peripheral portion. Sex goods.
<8> The absorbent article according to any one of <1> to <7>, wherein a plurality of the fiber lumps or the fiber lumps and the water-absorbent fibers are entangled with each other in the absorber.

<9> 前記吸収体において、前記前方領域又は前記後方領域の厚みと前記排泄部対向領域の横方向中央の厚みとの比率は、前者<後者を前提として、前者/後者として、好ましくは0.1以上、より好ましくは0.3以上、そして、好ましくは0.9以下、より好ましくは0.8以下である、前記<3>〜<8>のいずれか1に記載の吸収性物品。
<10> 前記吸収体の前記排泄部対向領域の非肌対向面側の、前記繊維塊及び前記吸水性繊維の合計含有質量に対する該繊維塊の含有質量の比率(繊維塊占有率)は、該吸収体の他の部位のそれよりも高いことを前提として、好ましくは50質量%以上、より好ましくは90質量%以上である、前記<1>〜<9>のいずれか1に記載の吸収性物品。
<11> 前記吸収体の前記排泄部対向領域の肌対向面側の、前記繊維塊及び前記吸水性繊維の合計含有質量に対する該繊維塊の含有質量の比率(繊維塊占有率)は、該吸収体の該排泄部対向領域の非肌対向面側のそれよりも低いことを前提として、好ましくは50質量%以下、より好ましくは10質量%以下である、前記<1>〜<10>のいずれか1に記載の吸収性物品。
<12> 前記吸収体の前記排泄部対向領域の非肌対向面側の、前記繊維塊及び前記吸水性繊維の合計含有質量に対する該繊維塊の含有質量の比率(繊維塊占有率)と、該吸収体の該排泄部対向領域の肌対向面側のそれとの差は、前者から後者を差し引いた場合に、好ましくは50質量%以上、より好ましくは90質量%以上である、前記<1>〜<11>のいずれか1に記載の吸収性物品。
<9> In the absorber, the ratio of the thickness of the anterior region or the posterior region to the thickness of the lateral center of the excretory portion facing region is the former / the latter, preferably 0. The absorbent article according to any one of <3> to <8> above, which is 1 or more, more preferably 0.3 or more, and preferably 0.9 or less, more preferably 0.8 or less.
<10> The ratio of the content mass of the fiber mass to the total content mass of the fiber mass and the water-absorbent fiber on the non-skin facing surface side of the excretion portion facing region of the absorber (fiber mass occupancy rate) is the said. The absorbency according to any one of <1> to <9>, which is preferably 50% by mass or more, more preferably 90% by mass or more, on the premise that it is higher than that of other parts of the absorber. Goods.
<11> The ratio of the content mass of the fiber mass to the total content mass of the fiber mass and the water-absorbent fiber on the skin-facing surface side of the excretion portion facing region of the absorber (fiber mass occupancy rate) is the absorption. Any of the above <1> to <10>, preferably 50% by mass or less, more preferably 10% by mass or less, on the premise that it is lower than that on the non-skin facing surface side of the excretion portion facing region of the body. The absorbent article according to 1.
<12> The ratio of the content mass of the fiber mass to the total content mass of the fiber mass and the water-absorbent fiber on the non-skin facing surface side of the excretion portion facing region of the absorber (fiber mass occupancy rate) and the said. The difference between the absorber and the region facing the excretion portion on the skin-facing surface side is preferably 50% by mass or more, more preferably 90% by mass or more, when the latter is subtracted from the former. The absorbent article according to any one of <11>.

<13> 前記繊維塊は、相対向する2つの基本面と、該2つの基本面を連結する骨格面とを備えている、前記<1>〜<12>のいずれか1に記載の吸収性物品。
<14> 前記繊維塊において、2つの前記基本面の総面積は、前記骨格面の総面積よりも大きい、前記<13>に記載の吸収性物品。
<15> 前記基本面の面積は、好ましくは1mm以上、より好ましくは5mm以上、そして、好ましくは100mm以下、より好ましくは50mm以下である、前記<13>又は<14>に記載の吸収性物品。
<16> 前記繊維塊に含まれる前記合成繊維は、前記吸水性繊維よりも吸水性が低く、好ましくは非吸水性である、前記<1>〜<15>のいずれか1に記載の吸収性物品。
<17> 前記繊維塊に含まれる前記合成繊維の含有量は、該繊維塊の全質量に対して、好ましくは90質量%以上であり、最も好ましくは100質量%である、前記<16>に記載の吸収性物品。
<18> 前記繊維塊に含まれる前記合成繊維は、水分率が6%未満であり、より好ましくは4%未満である、前記<16>又は<17>に記載の吸収性物品。
<19> 前記吸水性繊維は、水分率が6%以上であり、より好ましくは10%以上である、前記<1>〜<18>のいずれか1に記載の吸収性物品。
<20> 前記繊維塊は、水との接触角が90度未満、好ましくは70度以下である、前記<1>〜<19>のいずれか1に記載の吸収性物品。
<21> 前記吸収性物品が生理用ナプキンである、前記<1>〜<20>のいずれか1に記載の吸収性物品。
<13> The absorbability according to any one of <1> to <12>, wherein the fiber mass includes two opposing basic surfaces and a skeletal surface connecting the two basic surfaces. Goods.
<14> The absorbent article according to <13>, wherein in the fiber mass, the total area of the two basic surfaces is larger than the total area of the skeletal surface.
<15> The area of the basic surface is preferably 1 mm 2 or more, more preferably 5 mm 2 or more, and preferably 100 mm 2 or less, more preferably 50 mm 2 or less, according to <13> or <14>. Absorbent article.
<16> The absorbability according to any one of <1> to <15>, wherein the synthetic fiber contained in the fiber mass has a lower water absorption than the water-absorbent fiber and is preferably non-water-absorbent. Goods.
<17> The content of the synthetic fiber contained in the fiber mass is preferably 90% by mass or more, most preferably 100% by mass, based on the total mass of the fiber mass. The absorbent article described.
<18> The absorbent article according to <16> or <17>, wherein the synthetic fiber contained in the fiber mass has a water content of less than 6%, more preferably less than 4%.
<19> The absorbent article according to any one of <1> to <18>, wherein the water-absorbent fiber has a water content of 6% or more, more preferably 10% or more.
<20> The absorbent article according to any one of <1> to <19>, wherein the fiber mass has a contact angle with water of less than 90 degrees, preferably 70 degrees or less.
<21> The absorbent article according to any one of <1> to <20>, wherein the absorbent article is a sanitary napkin.

以下、本発明を実施例により更に具体的に説明するが、本発明は斯かる実施例に限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to such Examples.

〔実施例1〕
図3〜図5に示す吸収体4を製造し、実施例1の吸収体とした。具体的には、繊維塊11、吸水性繊維12F及び吸水性ポリマー13をコア形成材料として用い、公知の積繊装置を2台用いて、常法に従って、吸水性繊維リッチ部位12Pと繊維塊リッチ部位11Pをそれぞれ積繊して製造し、これら吸水性繊維リッチ部位12Pと繊維塊リッチ部位11Pとを重ね合わせるとともに厚み方向に加圧することによって、吸収性コア40を得、該吸収性コア40の外面全体を坪量16g/mのコアラップシート41で被覆して、吸収体4を製造した。繊維塊11の製造は図7に準じ、原料繊維シートを賽の目状に切断して製造した。前記繊維塊の原料繊維シートとして、ポリエチレン樹脂繊維及びポリエチレンテレフタラート樹脂繊維(非吸水性繊維、繊維径18μm)からなる非吸水性の熱可塑性繊維を構成繊維とする坪量18g/m、厚み0.6mmのエアスルー不織布(構成繊維同士の熱融着部を有する繊維シート)を用いた。吸水性繊維12Fとして、針葉樹晒クラフトパルプ(NBKP)を用いた。吸水性ポリマー13として、アクリル酸重合体部分ナトリウム塩を用いた。
[Example 1]
The absorber 4 shown in FIGS. 3 to 5 was produced and used as the absorber of Example 1. Specifically, the fiber mass 11, the water-absorbent fiber 12F, and the water-absorbent polymer 13 are used as the core forming material, and two known fiber stacking devices are used, and the water-absorbent fiber rich portion 12P and the fiber mass rich Each of the site 11Ps is produced by stacking fibers, and the water-absorbent fiber-rich site 12P and the fiber mass-rich site 11P are overlapped with each other and pressed in the thickness direction to obtain an absorbent core 40, and the absorbent core 40 is obtained. The entire outer surface was covered with a core wrap sheet 41 having a basis weight of 16 g / m 2 , and the absorber 4 was manufactured. The fiber mass 11 was produced by cutting the raw material fiber sheet into a sainome shape according to FIG. 7. As the raw material fiber sheet of the fiber mass, the basis weight is 18 g / m 2 and the thickness is 18 g / m 2 , which is composed of a non-water-absorbent thermoplastic fiber composed of a polyethylene resin fiber and a polyethylene terephthalate resin fiber (non-water-absorbent fiber, fiber diameter 18 μm). A 0.6 mm air-through non-woven fabric (fiber sheet having a heat-sealed portion between constituent fibers) was used. Coniferous bleached kraft pulp (NBKP) was used as the water-absorbent fiber 12F. Acrylic acid polymer partial sodium salt was used as the water-absorbent polymer 13.

実施例1の吸収体4は、縦方向長さ210mm、横方向長さ70mmであり、横方向長さは、前方領域A及び後方領域Cの一部である縦方向Xの前後端部を除き、吸収体4の縦方向の全長にわたって一定であった。実施例1の吸収体4の厚みは、前方領域A及び後方領域Cはそれぞれ3.2mm、排泄部対向領域Bは5.7mmであり、排泄部対向領域Bに、周辺部よりも使用者の肌側に向かって隆起した隆起部を有していた。また、実施例1の吸収性コア40は、排泄部対向領域Bの非肌対向面側B2の全体が繊維塊リッチ部位11P(繊維塊占有率が100質量%の部位)、それ以外の部位は全て吸水性繊維リッチ部位12P(繊維塊占有率が0.01質量%の部位、吸水性繊維占有率が99.9質量%の部位)であり、前方領域A(吸水性繊維リッチ部位12P)の縦方向長さ55mm、排泄部対向領域B(繊維塊リッチ部位11P)の縦方向長さ80mm、後方領域C(吸水性繊維リッチ部位12P)の縦方向長さ75mmであった。また、実施例1の吸収体4の前記クッション部面積率(吸収体の非肌対向面の全面積に占める排泄部対向領域Bの非肌対向面の面積の割合)は38.6%であった。実施例1の吸収性コア40の繊維塊の坪量は140g/m、吸水性繊維の坪量は210g/mとした。なお、実施例1の吸収性コア40には、吸水性ポリマー13が50g/m含まれており、その90質量%以上が吸水性繊維リッチ部位12Pに含まれる。また、繊維塊リッチ部位11Pと吸水性繊維リッチ部位12Pとの界面では、繊維塊11と吸水性繊維12との交絡が存在するが、該界面とその近傍領域以外では、繊維塊層11Pには吸水性繊維12は含まれず、吸水性繊維層12Pには繊維塊11は含まれていない。前記「繊維塊占有率」の値は、当該界面領域以外の部分における値である。 The absorber 4 of the first embodiment has a length of 210 mm in the vertical direction and a length of 70 mm in the horizontal direction, and the length in the horizontal direction is excluding the front and rear ends of the vertical direction X which is a part of the front region A and the rear region C. , It was constant over the entire length of the absorber 4 in the vertical direction. The thickness of the absorber 4 of Example 1 is 3.2 mm in the anterior region A and the posterior region C, and 5.7 mm in the excretion portion facing region B, and the thickness of the excretion portion facing region B is larger than that of the peripheral portion. It had a raised part that was raised toward the skin side. Further, in the absorbent core 40 of Example 1, the entire non-skin facing surface side B2 of the excretion portion facing region B is a fiber mass rich portion 11P (a portion having a fiber mass occupancy rate of 100% by mass), and the other portions are All are water-absorbent fiber-rich parts 12P (parts where the fiber mass occupancy is 0.01% by mass, parts where the water-absorbent fiber occupancy is 99.9% by mass), and are in the front region A (water-absorbent fiber-rich parts 12P). The vertical length was 55 mm, the vertical length of the excretion portion facing region B (fiber mass rich portion 11P) was 80 mm, and the vertical length of the rear region C (water-absorbent fiber rich portion 12P) was 75 mm. Further, the cushion portion area ratio of the absorber 4 of Example 1 (the ratio of the area of the non-skin facing surface of the excretion portion facing region B to the total area of the non-skin facing surface of the absorber) was 38.6%. It was. The basis weight of the fiber mass of the absorbent core 40 of Example 1 was 140 g / m 2 , and the basis weight of the water-absorbent fiber was 210 g / m 2 . The absorbent core 40 of Example 1 contains 50 g / m 2 of the water-absorbent polymer 13, and 90% by mass or more of the water-absorbent polymer 13 is contained in the water-absorbent fiber-rich portion 12P. Further, at the interface between the fiber mass rich portion 11P and the water-absorbent fiber rich portion 12P, there is an entanglement between the fiber mass 11 and the water-absorbent fiber 12, but other than the interface and the region in the vicinity thereof, the fiber mass layer 11P has an entanglement. The water-absorbent fiber 12 is not included, and the water-absorbent fiber layer 12P does not contain the fiber mass 11. The value of the "fiber mass occupancy rate" is a value in a portion other than the interface region.

〔比較例1〕
吸収性コア及びコアラップシートを具備する吸収要素の非肌対向面側に、弾力性に富むクッションシートを積層してなる積層体を製造し、比較例1の吸収体とした。比較例1の吸収体の厚みは5.7mm均一であった。比較例1の吸収要素は、吸収性コアが繊維塊を非含有である点以外は、実施例1の吸収体と基本構成が同じであった。クッションシートとして、吸収要素と平面視において同形状同寸法のシート状の坪量40g/mのエアスルー不織布を用い、クッションシートを3枚重ねて吸収要素の非肌対向面に固定してクッション部とした。クッションシートは、吸収要素の非肌対向面の全域を被覆するように固定し、クッションシート同士及びクッションシートと吸収要素との固定にはホットメルト接着剤を用いた。比較例1の吸収体においては、吸収体の非肌対向面の全域がクッション部で形成されているので、前記クッション部面積率は100%である。吸水性繊維の坪量は210g/mとした。
[Comparative Example 1]
A laminated body in which a cushion sheet having a high elasticity was laminated on the non-skin facing surface side of the absorbing element including the absorbent core and the core wrap sheet was produced, and used as the absorbent body of Comparative Example 1. The thickness of the absorber of Comparative Example 1 was uniform by 5.7 mm. The absorbent element of Comparative Example 1 had the same basic composition as the absorber of Example 1 except that the absorbent core did not contain a fiber mass. As the cushion sheet, an air-through non-woven fabric having the same shape and dimensions as the absorbing element and having a basis weight of 40 g / m 2 is used, and three cushion sheets are stacked and fixed to the non-skin facing surface of the absorbing element. And said. The cushion sheet was fixed so as to cover the entire non-skin facing surface of the absorbing element, and a hot melt adhesive was used to fix the cushion sheets to each other and the cushion sheet and the absorbing element. In the absorber of Comparative Example 1, the entire area of the non-skin facing surface of the absorber is formed by the cushion portion, so that the cushion portion area ratio is 100%. The basis weight of the water-absorbent fiber was 210 g / m 2 .

〔比較例2〕
比較例1の吸収要素の構成と同じまま比較例2の吸収体とした。比較例2の吸収体の厚みは5.7mm均一であった。吸水性繊維の坪量は350g/mとした。
[Comparative Example 2]
The structure of the absorbing element of Comparative Example 1 was the same as that of the absorbing element of Comparative Example 2. The thickness of the absorber of Comparative Example 2 was uniform by 5.7 mm. The basis weight of the water-absorbent fiber was 350 g / m 2 .

〔性能評価〕
各実施例及び比較例の吸収体について、下記方法により、動的ヨレ率、リングクラッシュ、曲げ剛性、動的最大吸収量、圧縮ひずみ率、回復仕事量をそれぞれ測定した。結果を下記表1に示す。
[Performance evaluation]
For the absorbers of each Example and Comparative Example, the dynamic twist rate, ring crush, flexural rigidity, dynamic maximum absorption amount, compressive strain rate, and recovery work amount were measured by the following methods. The results are shown in Table 1 below.

なお、測定対象として吸収性物品を用いる場合には、各実施例及び比較例の吸収体を用い、図1に示すナプキン1と基本構成が同様の生理用ナプキンを作製し、該生理用ナプキンを測定に用いた。生理用ナプキンにおける表面シートとして、坪量30g/mのエアスルー不織布を用い、裏面シートとして、37g/mのポリエチレン樹脂フィルム(FL−KDJ100nN、大化工業製)を用いた。 When an absorbent article is used as the measurement target, a sanitary napkin having the same basic configuration as the napkin 1 shown in FIG. 1 is prepared using the absorbers of each Example and Comparative Example, and the sanitary napkin is used. Used for measurement. An air-through non-woven fabric having a basis weight of 30 g / m 2 was used as the front sheet of the sanitary napkin, and a polyethylene resin film (FL-KDJ100nN, manufactured by Daika Kogyo Co., Ltd.) having a basis weight of 37 g / m 2 was used as the back sheet.

<動的ヨレ率の測定方法>
生理用ナプキンを測定サンプルとし、測定サンプルの動的ヨレ率を、駆動式の女性用下半身人体モデルを用いて評価した。まず、測定対象のナプキンの中央幅(ナプキンの縦方向中央における横方向長さ)(歩行前の中央幅)を測定し、該ナプキンをショーツに貼りつけて女性用人体モデルに装着させた。次に、人体モデルを100歩/分の速度で30分間歩行させ、その人体モデルの歩行中において、3分歩行後に装着状態のナプキンに脱繊維馬血を15秒間で1.5g注入する操作を6回繰り返し、合計9gの脱繊維馬血をナプキンに注入した。そして、ナプキンをショーツから外してその中央幅(歩行後の中央幅)を測定し、歩行前の中央幅と歩行後の中央幅とから、次式により動的ヨレ率(%)を算出した。動的ヨレ率の数値が小さいほど、ナプキンがヨレ難く、高評価となる。なお、測定対象に注入した脱繊維馬血は、日本バイオテスト(株)製脱繊維馬血で且つ液温25℃における粘性が8cpに調整されたものであり、また、斯かる粘度は、東機産業株式会社製TVB−10M形粘度計において、ロータ名称L/AdP(ロータコード19)のロータで回転速度12rpmにて測定した場合の粘度である。
動的ヨレ率(%)=[{(歩行前の中央幅)−(歩行後の中央幅)}/(歩行前の中央幅)]×100
<Measurement method of dynamic twist rate>
Using a sanitary napkin as a measurement sample, the dynamic twist rate of the measurement sample was evaluated using a driven female lower body human body model. First, the central width of the napkin to be measured (horizontal length in the vertical center of the napkin) (central width before walking) was measured, and the napkin was attached to shorts and attached to a female human body model. Next, the human body model is walked at a speed of 100 steps / minute for 30 minutes, and during the walking of the human body model, 1.5 g of defibered horse blood is injected into the worn napkin after walking for 3 minutes in 15 seconds. Repeated 6 times, a total of 9 g of defibered horse blood was injected into the napkin. Then, the napkin was removed from the shorts, the center width (center width after walking) was measured, and the dynamic twist rate (%) was calculated from the center width before walking and the center width after walking by the following formula. The smaller the value of the dynamic twist rate, the more difficult it is for the napkin to twist, and the higher the evaluation. The defibered horse blood injected into the measurement target was defibered horse blood manufactured by Nippon Biotest Co., Ltd., and its viscosity at a liquid temperature of 25 ° C. was adjusted to 8 cp, and such viscosity was adjusted to 8 cp. This is the viscosity when measured at a rotation speed of 12 rpm with a rotor having a rotor name of L / AdP (rotor code 19) in a TVB-10M viscometer manufactured by Kisangyo Co., Ltd.
Dynamic twist rate (%) = [{(center width before walking)-(center width after walking)} / (center width before walking)] x 100

<リングクラッシュの測定方法>
下記(湿潤状態の吸収体を備えた吸収性物品の調製方法)に従い、測定対象の吸収体を湿潤状態とし、その湿潤状態の吸収体を、該吸収体の肌対向面(生理用ナプキンにおける表面シートとの対向面)が内側となるように長手方向(縦方向)に湾曲させ、且つ長手方向の両端部どうしをホッチキスステープラで固定して、直径45mmのリング状の測定サンプルを作製した。株式会社島津製作所の小型卓上試験機EZTest(EZ−L)を用い、試験台にリング状の測定サンプルを、該リングの軸方向が該試験台の測定サンプル載置面に対して直交するように取り付け、圧縮速度120mm/分で、測定サンプルの圧縮手段と該測定サンプル載置面との間隔が30mmになるまで測定サンプルを繰り返し3回圧縮し、圧縮後の高さを測定した。圧縮前のサンプル高さと圧縮後のサンプル高さから、次式によりリングクラッシュ(%)を算出した。リングクラッシュの数値が小さいほど、当該吸収体は吸収性物品の着用時にヨレにくく、高評価となる。
リングクラッシュ(%)=[{(圧縮前の高さ)−(圧縮後の高さ)}/(圧縮前の高さ)]×100
<Measurement method of ring crash>
According to the following (method for preparing an absorbent article having a wet absorber), the absorber to be measured is brought into a wet state, and the wet absorber is placed on the skin-facing surface (surface of the sanitary napkin) of the absorber. A ring-shaped measurement sample having a diameter of 45 mm was prepared by curving the sheet in the longitudinal direction (longitudinal direction) so that the surface facing the sheet was inside and fixing both ends in the longitudinal direction with a stapler. Using the small desktop tester EZTest (EZ-L) manufactured by Shimadzu Corporation, place a ring-shaped measurement sample on the test table so that the axial direction of the ring is orthogonal to the measurement sample mounting surface of the test table. The measurement sample was repeatedly compressed three times at a compression rate of 120 mm / min until the distance between the measurement sample compression means and the measurement sample mounting surface was 30 mm, and the height after compression was measured. The ring crash (%) was calculated from the sample height before compression and the sample height after compression by the following formula. The smaller the ring crush value, the less likely the absorber is to twist when wearing an absorbent article, and the higher the evaluation.
Ring crash (%) = [{(height before compression)-(height after compression)} / (height before compression)] x 100

<曲げ剛性の測定方法>
生理用ナプキンを測定サンプルとし、株式会社大栄科学精器製作所の風合い試験機(ハンドルオ・メーター法、型式HOM−3)を用いて評価した。まず、スリット幅を40mmに設定した試料台の上に、生理用ナプキンの長手方向(縦方向)がブレードと直角になるように設置した。測定サンプルにおける曲げ剛性の測定箇所が試料台のスリット位置と重なるように、測定サンプルを試料台に配置した。生理用ナプキンの前方領域の曲げ剛性を測定する場合は、該前方領域の縦方向端部(ナプキンの前端部)から縦方向内方に35mmの位置を測定箇所とし、生理用ナプキンの後方領域の曲げ剛性を測定する場合は、該後方領域の縦方向端部(ナプキンの後端部)から縦方向内方に35mmの位置を測定箇所とし、生理用ナプキンの排泄部対向領域の曲げ剛性を測定する場合は、該排泄部対向領域の縦方向中央を測定箇所とした。次に、試料台表面から10mmまで下がるように設定したブレードを下降させて測定サンプルを押し、この時のピーク値(mN)を当該測定サンプルの曲げ剛性の値とした。曲げ剛性の数値が小さいほど、当該吸収体を組み込んだ吸収性物品は着用感に優れると判断され、高評価となる。
<Measurement method of flexural rigidity>
A sanitary napkin was used as a measurement sample and evaluated using a texture tester (handle o meter method, model HOM-3) manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd. First, the sanitary napkin was placed on a sample table having a slit width of 40 mm so that the longitudinal direction (longitudinal direction) was perpendicular to the blade. The measurement sample was placed on the sample table so that the measurement point of the flexural rigidity in the measurement sample overlapped with the slit position of the sample table. When measuring the bending rigidity of the front region of the sanitary napkin, the measurement point is 35 mm inward in the vertical direction from the vertical end of the front region (front end of the napkin), and the position of the rear region of the sanitary napkin When measuring the bending rigidity, the bending rigidity of the sanitary napkin facing the excretion part is measured at a position 35 mm inward in the vertical direction from the vertical end (rear end of the napkin) of the rear region. In this case, the measurement point was the center of the area facing the excretion part in the vertical direction. Next, the blade set to be lowered to 10 mm from the surface of the sample table was lowered to push the measurement sample, and the peak value (mN) at this time was taken as the value of the flexural rigidity of the measurement sample. The smaller the value of the flexural rigidity, the more excellent the absorbent article incorporating the absorber is, and the higher the evaluation is.

<動的最大吸収量の測定方法>
測定対象の生理用ナプキンを生理用ショーツに固定し、人体の動的モデルに装着した。人体の動的モデルとしては、両脚を歩行運動させることが可能な可動式女性腰部モデルを用いた。動的モデルの歩行動作を開始させ、歩行動作開始より1分後に、液排泄点より2gの疑似血液を注入した(1回目)。更に1回目の液注入終了より3分後に3gの疑似血液を注入した(2回目)。更に2回目の液注入終了より3分後に2gの疑似血液を注入した(3回目)。3回目以降は、液注入後から3分後に2gの疑似血液を注入する操作を繰り返し、生理用ナプキンのウイング部から疑似血液が染み出した時点で液注入操作を終了し、その時点までに注入した疑似血液の総重量を動的最大吸収量(g)とした。
擬似血液は、B型粘度計(東機産業株式会社製 型番TVB−10M、測定条件:ローターNo.19、30rpm、25℃、60秒間)を用いて測定した粘度が8mPa・sになるように、脱繊維馬血(株式会社日本バイオテスト研究所製)の血球・血漿比率を調製したものを用いた。動的最大吸収量の数値が大きいほど、体液が素早く吸収体へ移行し易く、漏れ難く、高評価となる。
<Measurement method of dynamic maximum absorption>
The sanitary napkin to be measured was fixed to the sanitary shorts and attached to a dynamic model of the human body. As a dynamic model of the human body, a movable female lumbar model capable of walking and moving both legs was used. The walking motion of the dynamic model was started, and 1 minute after the start of the walking motion, 2 g of pseudo blood was injected from the liquid excretion point (first time). Further, 3 g of pseudo blood was injected 3 minutes after the completion of the first liquid injection (second time). Furthermore, 2 g of pseudo blood was injected 3 minutes after the completion of the second liquid injection (third time). From the third time onward, the operation of injecting 2 g of pseudo blood is repeated 3 minutes after the liquid injection, and the liquid injection operation is completed when the pseudo blood exudes from the wing of the sanitary napkin, and the injection is performed by that time. The total weight of the simulated blood was taken as the dynamic maximum absorption amount (g).
The viscosity of the simulated blood is 8 mPa · s measured using a B-type viscometer (model number TVB-10M manufactured by Toki Sangyo Co., Ltd., measurement conditions: rotor No. 19, 30 rpm, 25 ° C., 60 seconds). , A prepared blood cell / plasma ratio of defibered horse blood (manufactured by Japan Biotest Research Institute Co., Ltd.) was used. The larger the value of the maximum dynamic absorption amount, the quicker the body fluid is transferred to the absorber, the less likely it is to leak, and the higher the evaluation.

<圧縮ひずみ率(ΔT/T0)の測定方法>
試料の圧縮ひずみ率(ΔT/T0)は、KESを用いて測定することができる。具体的には、カトーテック株式会社製の自動化圧縮試験装置KES−G5を用いて圧縮ひずみ率(ΔT/T0)を測定した。測定手順は以下のとおりである。
下記(湿潤状態の吸収体を備えた吸収性物品の調製方法)に従い、測定対象の吸収体を湿潤状態とした。試料を圧縮試験装置の試験台に取り付ける。次に、その試料を面積2cm2の円形平面を持つ鋼板間で圧縮し、その圧縮時の荷重を徐々に大きくしていって、該荷重が所定の最大値(最大荷重)となった時点での測定対象物の厚み(圧縮厚み)Tmを測定する。測定対象物にシワや折れ曲がりがないように留意する。圧縮試験機の測定条件は下記のとおり。
・圧縮速度:0.2mm/sec
・最大荷重:2450mN/cm
・SENS:10
・DEF:20
また、測定対象物の初期厚み(T0)は、前記荷重が103.9mN/cmの時点での厚みとした。次式により圧縮ひずみ率(%)を算出する。
圧縮ひずみ率(ΔT/T0)={(T0−Tm)/T0)}×100
<Measurement method of compression strain rate (ΔT / T0)>
The compressive strain rate (ΔT / T0) of the sample can be measured using KES. Specifically, the compression strain rate (ΔT / T0) was measured using an automated compression test device KES-G5 manufactured by Kato Tech Co., Ltd. The measurement procedure is as follows.
The absorber to be measured was placed in a wet state according to the following (method for preparing an absorbent article having a wet absorber). Attach the sample to the test bench of the compression test device. Next, the sample is compressed between steel plates having a circular plane with an area of 2 cm2, and the load at the time of compression is gradually increased, and when the load reaches a predetermined maximum value (maximum load). The thickness (compressed thickness) Tm of the object to be measured is measured. Be careful not to wrinkle or bend the object to be measured. The measurement conditions of the compression tester are as follows.
-Compression speed: 0.2 mm / sec
・ Maximum load: 2450 mN / cm 2
・ SENS: 10
・ DEF: 20
The initial thickness (T0) of the object to be measured was the thickness at the time when the load was 103.9 mN / cm 2 . The compression strain rate (%) is calculated by the following formula.
Compressive strain rate (ΔT / T0) = {(T0-Tm) / T0)} × 100

<圧縮仕事量及び回復仕事量の測定方法>
測定対象物(吸収体)の回復仕事量(以下、「WC’」ともいう。)は、カトーテック株式会社製のKES(カワバタ・エバリュエーション・システム)での測定値で表し得ることが一般的に知られている(参考文献:風合い評価の標準化と解析(第2版)、著者 川端季雄、昭和55年7月10日発行)。具体的には、カトーテック株式会社製の圧縮試験装置KES−G5を用いてWC’を測定することができる。測定手順は以下のとおりである。なお、WC’の測定の際には、圧縮仕事量(以下、「WC」ともいう。)も併せて測定可能であるので、以下ではWC及びWC’の測定方法を併記する。
240mm×70mmの平面視四角形形状の試料(コアラップシートで包まれている吸収体)を用意し、圧縮試験装置の試験台に取り付ける。下記(湿潤状態の吸収体を備えた吸収性物品の調製方法)に従い、該吸収体を湿潤状態として、測定サンプルとする。次に、測定サンプルの非凹陥部、すなわち圧搾加工などが施されておらず測定サンプルの姿が残っている部分を、面積2cmの円形平面を持つ鋼板間で圧縮する。斯かる圧縮工程において、圧縮速度は0.2cm/sec、圧縮最大荷重は2450mN/cmとする。回復過程も同一速度で測定を行う。WCは下記式(1)、WC’は下記式(2)で表され、単位は「mN・cm/cm」である。下記式中、Tmは、2450mN/cm(4.9kPa)荷重時の厚み、TOは、4.902mN/cm(49Pa)荷重時の厚みを示す。また、下記式(1)中のPa及び下記式(2)中のPbは、それぞれ、圧縮過程時の測定荷重(mN/cm)、回復過程時の測定荷重(mN/cm)を示す。
<Measurement method of compression work and recovery work>
The recovery work amount of the object to be measured (absorbent) (hereinafter, also referred to as "WC'") can generally be expressed by the measured value by KES (Kawabata Evaluation System) manufactured by Kato Tech Co., Ltd. (Reference: Standardization and analysis of texture evaluation (2nd edition), author Norio Kawabata, published on July 10, 1980). Specifically, WC'can be measured using a compression test device KES-G5 manufactured by Kato Tech Co., Ltd. The measurement procedure is as follows. Since the amount of compression work (hereinafter, also referred to as “WC”) can be measured at the time of measuring WC', the measuring methods of WC and WC'will be described together below.
Prepare a 240 mm × 70 mm rectangular sample (absorbent wrapped in a core wrap sheet) and attach it to the test table of the compression test device. According to the following (method for preparing an absorbent article having a wet absorber), the absorber is brought into a wet state and used as a measurement sample. Next, the non-recessed portion of the measurement sample, that is, the portion that has not been pressed and the appearance of the measurement sample remains, is compressed between the steel plates having a circular plane with an area of 2 cm 2 . In such a compression step, the compression rate is 0.2 cm / sec, and the maximum compression load is 2450 mN / cm 2 . The recovery process is also measured at the same speed. WC is represented by the following formula (1), WC'is represented by the following formula (2), and the unit is "mN · cm / cm 2 ". In the following formula, Tm is, 2450mN / cm 2 (4.9kPa) thickness under load, TO indicates the thickness of 4.902mN / cm 2 (49Pa) at a load. Further, Pb in the following formula (1) Pa and the following equation in (2), respectively, measured load at the compression process (mN / cm 2), showing a measuring load during the recovery process (mN / cm 2) ..

Figure 0006763051
Figure 0006763051

Figure 0006763051
Figure 0006763051

なお、WC’は、KES−G5の測定結果画面には表示されず、該測定結果画面に表示されるのは、WCと、WC’から算出される圧縮回復率ないし圧縮レジリエンス(以下、「RC」ともいう。)である。このような場合には、測定装置に表示されるパラメータ(WC,RC)を用い、次式によりWC’を算出する。 Note that WC'is not displayed on the measurement result screen of KES-G5, and what is displayed on the measurement result screen is the WC and the compression recovery rate or compression resilience calculated from WC'(hereinafter, "RC"). It is also called.). In such a case, WC'is calculated by the following equation using the parameters (WC, RC) displayed on the measuring device.

Figure 0006763051
Figure 0006763051

(湿潤状態の吸収体を備えた吸収性物品の調製方法)
脱繊維馬血を注入する前の吸収性物品を気温23℃、相対湿度50RH%の環境下で24時間放置して、乾燥状態の吸収性物品を調製する。当該乾燥状態の吸収性物品を、表面シート側(肌対向面側)が上側となるようにして水平に置き、その表面シート上に、楕円形注入口(長径50mm、短径23m)を置き、該注入口から脱繊維馬血を3.0g注入し、1分静置した後に更に脱繊維馬血3.0gを注入し、注入後1分間その状態を保持して、湿潤状態の吸収体を備えた吸収性物品を得る。なお、吸収性物品に注入した脱繊維馬血は、日本バイオテスト(株)製脱繊維馬血で且つ液温25℃における粘度が8cpに調整されたものであり、また、斯かる粘度は、東機産業株式会社製TVB−10M形粘度計において、ロータ名称L/Adp(ロータコード19)のロータで回転速度12rpmにて測定した場合の粘度である。
(Method of preparing an absorbent article having a wet absorber)
The absorbent article before injecting the defibered horse blood is left to stand for 24 hours in an environment of a temperature of 23 ° C. and a relative humidity of 50 RH% to prepare a dry absorbent article. The dry absorbent article is placed horizontally so that the surface sheet side (skin facing surface side) is on the upper side, and an elliptical injection port (major axis 50 mm, minor axis 23 m) is placed on the surface sheet. 3.0 g of defibered horse blood is injected from the injection port, and after allowing to stand for 1 minute, another 3.0 g of defibered horse blood is injected, and the state is maintained for 1 minute after the injection to obtain a wet absorber. Obtain a prepared absorbent article. The defibered horse blood injected into the absorbent article was defibered horse blood manufactured by Nippon Biotest Co., Ltd., and its viscosity at a liquid temperature of 25 ° C. was adjusted to 8 cp. This is the viscosity when measured at a rotation speed of 12 rpm with a rotor having a rotor name of L / Adp (rotor code 19) in a TVB-10M viscometer manufactured by Toki Sangyo Co., Ltd.

Figure 0006763051
Figure 0006763051

1 生理用ナプキン(吸収性物品)
A 前方領域
B 排泄部対向領域
C 後方領域
2 表面シート
3 裏面シート
4 吸収体
40 吸収性コア
11 繊維塊
11F 繊維塊の構成繊維(合成繊維)
111 基本面
112 骨格面
12F 吸水性繊維
11P 繊維塊リッチ部位
12P 吸水性繊維リッチ部位
13 吸水性ポリマー
15 隆起部
41 コアラップシート
10bs 繊維塊の原料繊維シート
1 Sanitary napkin (absorbent article)
A Front area B Excretion part facing area C Rear area 2 Front sheet 3 Back sheet 4 Absorber 40 Absorbent core 11 Fiber mass 11F Fiber mass constituent fibers (synthetic fiber)
111 Basic surface 112 Skeletal surface 12F Water-absorbent fiber 11P Fiber mass rich part 12P Water-absorbent fiber rich part 13 Water-absorbent polymer 15 Raised part 41 Core wrap sheet 10bs Raw material fiber sheet for fiber mass

Claims (8)

使用者の前後方向に対応する縦方向とこれに直交する横方向とを有し、且つ使用時に使用者の排泄部に対向配置される排泄部対向領域と、該排泄部対向領域よりも縦方向前側に配される前方領域と、該排泄部対向領域よりも縦方向後側に配される後方領域とを有し、吸収体を備えた吸収性物品であって、
前記吸収体は、合成繊維を含む繊維塊と、吸水性繊維とを含有し、
前記吸収体において、前記繊維塊及び前記吸水性繊維の合計含有質量に対する該繊維塊の含有質量の比率は、前記前方領域及び前記後方領域よりも前記排泄部対向領域の方が大きく、且つ該排泄部対向領域では、該吸収体の非肌対向面側よりも該吸収体の肌対向面側の方が小さい吸収性物品。
An excretion part facing region having a vertical direction corresponding to the front-back direction of the user and a horizontal direction orthogonal to the vertical direction and being arranged to face the excretion part of the user at the time of use, and a vertical direction from the excretion part facing area. An absorbent article having an anterior region arranged on the front side and a rear region arranged on the rear side in the longitudinal direction with respect to the excretion portion facing region and having an absorber.
The absorber contains a fiber mass containing synthetic fibers and a water-absorbent fiber.
In the absorber, the ratio of the content mass of the fiber mass to the total content mass of the fiber mass and the water-absorbent fiber is larger in the excretion portion facing region than in the front region and the rear region, and the excretion thereof. In the portion facing region, the absorbent article is smaller on the skin facing surface side of the absorber than on the non-skin facing surface side of the absorber.
前記吸収体は、前記排泄部対向領域に、該吸収体が含有する全ての前記繊維塊の90質量%以上を含有する請求項1に記載の吸収性物品。 The absorbent article according to claim 1, wherein the absorber contains 90% by mass or more of all the fiber lumps contained in the absorber in the region facing the excretion portion. 前記吸収体の厚みは、前記排泄部対向領域の横方向中央よりも前記前方領域及び前記後方領域の方が薄い請求項1又は2に記載の吸収性物品。 The absorbent article according to claim 1 or 2, wherein the thickness of the absorber is thinner in the front region and the rear region than in the lateral center of the excretion portion facing region. 前記吸収体の非肌対向面における前記排泄部対向領域に位置する部分の面積は、該吸収体の非肌対向面の面積の60%以下である請求項1〜3のいずれか1項に記載の吸収性物品。 The item according to any one of claims 1 to 3, wherein the area of the portion of the non-skin facing surface of the absorber located in the excretion portion facing region is 60% or less of the area of the non-skin facing surface of the absorber. Absorbent article. 前記吸収体は、吸水性ポリマーを少なくとも前記排泄部対向領域に含有し、且つ該吸収体における該吸水性ポリマーの含有量は、前記非肌対向面側よりも前記肌対向面側の方が多い請求項1〜4のいずれか1項に記載の吸収性物品。 The absorber contains at least the water-absorbent polymer in the excretion portion facing region, and the content of the water-absorbing polymer in the absorber is larger on the skin-facing surface side than on the non-skin-facing surface side. The absorbent article according to any one of claims 1 to 4. 前記吸収体は、前記繊維塊及び前記吸水性繊維を含有する吸収性コアと、該吸収性コアの外面を被覆するコアラップシートとを具備する請求項1〜5のいずれか1項に記載の吸収性物品。 The absorber according to any one of claims 1 to 5, wherein the absorber includes an absorbent core containing the fiber mass and the water-absorbent fiber, and a core wrap sheet covering the outer surface of the absorbent core. Absorbent article. 前記吸収体は、前記排泄部対向領域に、周辺部よりも使用者の肌側に向かって隆起した隆起部を有する請求項1〜6のいずれか1項に記載の吸収性物品。 The absorbent article according to any one of claims 1 to 6, wherein the absorber has a raised portion in the area facing the excretory portion, which is raised toward the skin side of the user rather than the peripheral portion. 前記吸収体において、複数の前記繊維塊同士又は該繊維塊と前記吸水性繊維とが互いに交絡している請求項1〜7のいずれか1項に記載の吸収性物品。 The absorbent article according to any one of claims 1 to 7, wherein a plurality of the fiber lumps or the fiber lumps and the water-absorbent fibers are entangled with each other in the absorber.
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