JP7411430B2 - Absorbent bodies and absorbent articles - Google Patents

Absorbent bodies and absorbent articles Download PDF

Info

Publication number
JP7411430B2
JP7411430B2 JP2020014516A JP2020014516A JP7411430B2 JP 7411430 B2 JP7411430 B2 JP 7411430B2 JP 2020014516 A JP2020014516 A JP 2020014516A JP 2020014516 A JP2020014516 A JP 2020014516A JP 7411430 B2 JP7411430 B2 JP 7411430B2
Authority
JP
Japan
Prior art keywords
core
sheet
absorbent body
water
skin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2020014516A
Other languages
Japanese (ja)
Other versions
JP2021097986A5 (en
JP2021097986A (en
Inventor
藍子 恩田
亮太 蔵前
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kao Corp
Original Assignee
Kao Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kao Corp filed Critical Kao Corp
Priority to CN202080086391.7A priority Critical patent/CN114845679B/en
Priority to PCT/JP2020/048066 priority patent/WO2021132294A1/en
Publication of JP2021097986A publication Critical patent/JP2021097986A/en
Publication of JP2021097986A5 publication Critical patent/JP2021097986A5/ja
Application granted granted Critical
Publication of JP7411430B2 publication Critical patent/JP7411430B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • A61F13/536—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes having discontinuous areas of compression

Description

本発明は、吸収性物品用の吸収体に関する。 The present invention relates to an absorbent body for absorbent articles.

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、木材パルプ等の繊維材料の積繊体からなり、更に該積繊体に吸水性ポリマー粒子が担持されている場合が多い。このような繊維材料の積繊体からなる吸収体は、比較的嵩高で厚みが厚いため、クッション性等に優れる反面、嵩張るために、吸収性物品の外観がスッキリせず見栄えが悪くなる、吸収性物品の着用者にゴワゴワとした違和感を与える等の問題があった。特に、吸収性物品の着用中に着用者が尿や経血等の体液を***した場合、吸収体はその***物を吸収保持することで膨潤するため、斯かる問題は一層深刻なものとなる。そこで、吸収体の薄型化が検討されている。 Absorbent articles such as disposable diapers and sanitary napkins generally have a top sheet placed relatively close to the wearer's skin, and a back sheet placed relatively far from the wearer's skin. , and an absorbent body interposed between both sheets. This absorbent body is typically made of a stack of fiber materials such as wood pulp, and the stack often carries water-absorbing polymer particles. Absorbent bodies made of stacks of fiber materials are relatively bulky and thick, so they have excellent cushioning properties, but on the other hand, because they are bulky, the appearance of the absorbent article does not look clean and the appearance is poor. There have been problems such as giving a stiff and uncomfortable feeling to the wearer of the sex article. In particular, if the wearer excretes body fluids such as urine or menstrual blood while wearing an absorbent article, the absorbent absorbs and retains the excrement and swells, making this problem even more serious. . Therefore, attempts are being made to make the absorber thinner.

吸収体の薄型化に関する従来技術として、例えば特許文献１には、パルプ及び吸水性ポリマーからなる上層吸収体と、該上層吸収体の非肌対向面側に隣接して配置され、２層のシート間に吸水性ポリマーが配置されてなる下層吸収体とから構成された吸収体が記載されている。前記上層吸収体には、吸収体が適用される吸収性物品の縦方向（着用者の前後方向）に延びる開口が形成される。前記下層吸収体は、互いに接合された前記２層のシート間に粒子状の吸水性ポリマーが封入された複数の吸水性ポリマー配置領域に区画され、且つ隣り合う該吸水性ポリマー配置領域どうしの間が、該吸水性ポリマー配置領域よりも窪んだ流路部とされている。前記流路部には、吸水性ポリマーが存在しないか、前記吸水性ポリマー配置領域より低目付で存在する。したがって、前記下層吸収体では吸水性ポリマーは均一に分布していない。特許文献１に記載の吸収体によれば、吸水性ポリマーを主体とするシート状の前記下層吸収体を採用することで、薄型でありながら十分な吸収量が確保できるようになり、また、前記上層吸収体にも吸水性ポリマーが含まれているため、パルプのみからなる場合の液保持しにくく逆戻りが生じるという問題が解決できるとされている。 As a conventional technique related to making the absorbent body thinner, for example, Patent Document 1 discloses an upper layer absorbent body made of pulp and a water-absorbing polymer, and a two-layer sheet disposed adjacent to the non-skin-facing side of the upper layer absorbent body. An absorbent body comprising a lower layer absorbent body and a water-absorbing polymer disposed therebetween is described. The upper absorbent core is formed with an opening that extends in the longitudinal direction of the absorbent article to which the absorbent core is applied (the front-rear direction of the wearer). The lower layer absorbent body is divided into a plurality of water-absorbing polymer placement regions in which particulate water-absorbing polymer is encapsulated between the two sheets bonded to each other, and between adjacent water-absorbing polymer placement regions. However, the flow path portion is recessed from the water-absorbing polymer arrangement region. The water-absorbing polymer does not exist in the flow path portion, or exists with a lower basis weight than the water-absorbing polymer arrangement region. Therefore, the water-absorbing polymer is not uniformly distributed in the lower absorbent layer. According to the absorbent body described in Patent Document 1, by employing the sheet-like lower layer absorbent body mainly made of a water-absorbing polymer, a sufficient amount of absorption can be ensured despite being thin. Since the upper absorbent layer also contains a water-absorbing polymer, it is said to be able to solve the problem of difficulty retaining liquid and causing backflow when it is made only of pulp.

特許文献２にも、特許文献１と同様の二層構造の吸収体が記載されている。特許文献２に記載の吸収体においては、二層構造における相対的に着用者の肌から遠い下層が、実質的にセルロースを含まずに吸水性ポリマーを主体として構成されている。また特許文献３には、吸水性樹脂及び接着剤を含有してなる吸収層が２枚以上の親水性不織布により挟持された構造を有する吸水シート組成物において、該吸収層が透水性基質によって厚み方向に分割されたものが記載されている。 Patent Document 2 also describes an absorbent body having a two-layer structure similar to Patent Document 1. In the absorbent body described in Patent Document 2, the lower layer of the two-layer structure, which is relatively far from the wearer's skin, does not substantially contain cellulose and is mainly composed of a water-absorbing polymer. Further, Patent Document 3 describes a water-absorbent sheet composition having a structure in which an absorbent layer containing a water-absorbing resin and an adhesive is sandwiched between two or more sheets of hydrophilic nonwoven fabric, in which the absorbent layer has a thickness that is It is divided into directions.

特開２０１８－５０９８７号公報Unexamined Japanese Patent Publication No. 2018-50987 特表２０１０－５２９８７９号公報Special Publication No. 2010-529879 国際公開第２０１０／０７６８５７号International Publication No. 2010/076857

吸収体の薄型化を目的とした従来技術は、吸液前の厚みを薄くすることに主眼を置いたものがほとんどであり、吸液後の柔軟性、液吸収性能などの諸性能に着眼したものはほとんど無いのが実情である。 Most conventional technologies aimed at making absorbers thinner have focused on reducing the thickness before liquid absorption, and have focused on various performances such as flexibility and liquid absorption performance after liquid absorption. The reality is that there are very few.

また、吸収性物品用の吸収体としては、吸収性物品着用時の違和感の低減、液の取り込み性や拡散性の向上等の観点から、吸収体の形成材料が存在しないか又は周辺部よりも低坪量で存在する部分（以下、「形成材料非存在部」ともいう。）が設けられたものが知られている（例えば特許文献１）。しかしながら、本発明者らの知見によれば、形成材料非存在部が形成され表面に凹凸を有する薄型の吸収体を使い捨ておむつに用いた場合、そのおむつの着用中に、着用者の***物の吸収に伴う該吸収体の膨潤によって、おむつの外面における該吸収体の配置領域が、該吸収体の凹凸に対応する形で、外部から視認できる程度に凹凸状に膨らみ、該配置領域を手指で触ったときに凸凹した状態となり得ることが判明した。このような、表面に凹凸を有する吸収体の膨潤に伴って吸収性物品の外面に凹凸が発生する現象は、至極当然のことであり、吸収性物品という製品の品質上何等問題は無いのであるが、一般消費者に対し、吸収体が壊れてその機能が損なわれたかの如きイメージを与える場合がある。そうすると、例えば、乳幼児が着用している使い捨ておむつにおいて前記の現象が発生した場合、その現象発生を確認した母親などの第三者が、吸収体が壊れたと勘違いして、まだ十分に使えるおむつを取り替えてしまう事態が発生し得る。このような、形成材料非存在部を有する吸収体、特に薄型の吸収体に特有の課題に着目した技術はほとんど無いのが実情である。 In addition, from the viewpoint of reducing discomfort when wearing the absorbent article and improving liquid uptake and dispersibility, the absorbent body for absorbent articles should be made in such a way that the forming material of the absorbent body does not exist or is lower than the surrounding area. It is known that a part having a low basis weight (hereinafter also referred to as a "forming material non-existing part") is provided (for example, Patent Document 1). However, according to the findings of the present inventors, when a thin absorbent material having a non-forming material area and an uneven surface is used in a disposable diaper, the wearer's excrement may be removed while wearing the diaper. Due to the swelling of the absorbent body due to absorption, the area where the absorbent body is placed on the outer surface of the diaper swells in a concave and convex shape to the extent that it can be seen from the outside in a manner corresponding to the unevenness of the absorbent body, and the area where the absorbent body is placed on the outer surface of the diaper swells to the extent that it is visible from the outside. It has been found that it can become uneven when touched. This phenomenon in which unevenness occurs on the outer surface of an absorbent article due to swelling of an absorbent material having an uneven surface is completely natural and does not pose any problem in terms of the quality of the absorbent article. However, this may give the impression to general consumers that the absorbent body is broken and its function is impaired. For example, if the above-mentioned phenomenon occurs in a disposable diaper worn by an infant, a third party such as a mother who confirms the occurrence of the phenomenon may mistakenly believe that the absorbent material is broken and replace the diaper with a diaper that is still usable. There may be a situation where you have to replace it. The reality is that there are almost no techniques that focus on the problems unique to absorbers having non-forming material portions, particularly thin absorbers.

したがって本発明の課題は、厚みを薄くしても実用上十分な液吸収性能を有し、且つ吸収性物品の着用時の違和感を低減させるとともに、吸液後に吸収性物品の外面に吸収体の壊れを想起させるような凹凸を発生させ難い、吸収性物品用の吸収体を提供することに関する。 Therefore, it is an object of the present invention to have practically sufficient liquid absorption performance even when the thickness is reduced, to reduce discomfort when wearing an absorbent article, and to provide an absorbent material on the outer surface of the absorbent article after absorbing liquid. The present invention relates to providing an absorbent body for an absorbent article that does not easily generate unevenness that may lead to breakage.

本発明は、着用者の前後方向に対応する縦方向と該縦方向に直交する横方向とを有し、着用者の股間部に配される股下部と、該股下部よりも着用者の腹側に配される腹側部と、該股下部よりも着用者の背側に配される背側部とを備える吸収性物品に用いられる吸収体である。
本発明の吸収体の一実施形態では、中間シートと、該中間シートの非肌対向面側に配される第１シートと、該中間シートの肌対向面側に配される第２シートとを具備し、該第１シートと該中間シートとの間に、吸水性材料として少なくとも吸水性ポリマーを含有する第１コアが介在配置され、該中間シートと該第２シートとの間に、吸液により膨潤する吸水性の第２コアが介在配置されている。
本発明の吸収体の一実施形態では、前記第２コアの前記股下部に対応する領域に、該第２コアを厚み方向に貫通する貫通孔が形成され、該貫通孔と平面視で重なる領域において、前記第２シートと前記中間シートとが、該第２コアにおける該貫通孔の周辺の貫通孔非形成部と平面視で重なる領域よりも近接している。
本発明の吸収体の一実施形態では、前記第１コアの形成材料の９０質量％以上が吸水性ポリマーである。
本発明の吸収体の一実施形態では、前記第１コアの前記股下部に対応する領域において、前記吸水性ポリマーが均一に分布している。
本発明の吸収体の一実施形態では、前記吸収体は、吸液状態において、前記貫通孔と平面視で重なる領域の肌対向面側及び非肌対向面側に凹部を有し、該非肌対向面側の凹部の深さが、該肌対向面側の凹部の深さの４０％以下である。 The present invention has a vertical direction corresponding to the front and back direction of the wearer and a horizontal direction perpendicular to the vertical direction, and has a crotch area located in the crotch area of the wearer, and a crotch area that is closer to the wearer's abdomen than the crotch area. This is an absorbent body used in an absorbent article including a ventral part disposed on the side and a dorsal part disposed on the dorsal side of the wearer with respect to the crotch area.
In one embodiment of the absorbent body of the present invention, an intermediate sheet, a first sheet disposed on the non-skin facing surface side of the intermediate sheet, and a second sheet disposed on the skin facing surface side of the intermediate sheet are provided. A first core containing at least a water-absorbing polymer as a water-absorbing material is interposed between the first sheet and the intermediate sheet, and a liquid-absorbing material is interposed between the intermediate sheet and the second sheet. A water-absorbent second core that swells with water is interposed therebetween.
In one embodiment of the absorbent body of the present invention, a through hole passing through the second core in the thickness direction is formed in a region corresponding to the crotch portion of the second core, and a region overlaps with the through hole in plan view. In the second core, the second sheet and the intermediate sheet are closer to each other than a region of the second core that overlaps a non-through-hole portion around the through-hole in a plan view.
In one embodiment of the absorbent body of the present invention, 90% by mass or more of the material forming the first core is a water-absorbing polymer.
In one embodiment of the absorbent body of the present invention, the water-absorbing polymer is uniformly distributed in a region corresponding to the crotch portion of the first core.
In one embodiment of the absorbent body of the present invention, the absorbent body has a concave portion on a skin-facing surface side and a non-skin-facing surface side in a region that overlaps with the through-hole in a plan view in a liquid-absorbing state, and The depth of the recess on the surface side is 40% or less of the depth of the recess on the skin-facing surface.

また本発明は、前記の本発明の吸収体を備えた吸収性物品である。
本発明の他の特徴、効果及び実施形態は、以下に説明される。 The present invention also provides an absorbent article comprising the above-described absorbent body of the present invention.
Other features, advantages and embodiments of the invention are described below.

本発明によれば、厚みを薄くしても実用上十分な液吸収性能を有し、且つ吸収性物品の着用時の違和感を低減させるとともに、吸液後に吸収性物品の外面に吸収体の壊れを想起させるような凹凸を発生させ難い、吸収性物品用の吸収体、並びに該吸収体を備えた吸収性物品が提供される。 According to the present invention, even if the thickness is reduced, it has practically sufficient liquid absorption performance, reduces discomfort when wearing the absorbent article, and prevents breakage of the absorber from occurring on the outer surface of the absorbent article after absorbing liquid. Provided are an absorbent body for an absorbent article that does not easily generate unevenness reminiscent of the above, and an absorbent article equipped with the absorbent body.

図１は、本発明の吸収性物品の一実施形態である展開型使い捨ておむつの展開且つ伸長状態における肌対向面側（表面シート側）を模式的に示す展開平面図である。FIG. 1 is a developed plan view schematically showing the skin-facing surface side (topsheet side) of a deployable disposable diaper, which is an embodiment of the absorbent article of the present invention, in an expanded and stretched state. 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 in FIG. 図３は、図１の使い捨ておむつにおけ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 side of the absorber in the disposable diaper of FIG. 1. 図４は、図３に示す吸収体の長手方向中央（符号ＣＬｘで示す縦中心線）位置での厚み方向に沿う断面を模式的に示す横断面図である。FIG. 4 is a cross-sectional view schematically showing a cross section along the thickness direction of the absorbent body shown in FIG. 3 at the center in the longitudinal direction (vertical center line indicated by the symbol CLx). 図５は、図４に示す吸収体を簡略化した模式的な横断面図であり、図５（ａ）は該吸収体の吸液前の状態を示し、図５（ｂ）は該吸収体の吸液状態を示す。5 is a simplified schematic cross-sectional view of the absorber shown in FIG. 4, FIG. 5(a) shows the state of the absorber before liquid absorption, and FIG. 5(b) shows the absorber Indicates the liquid absorption state. 図６（ａ）及び図６（ｂ）は、それぞれ、本発明の吸収体の一実施形態の一部の厚み方向に沿う断面を模式的に示す横断面図である。FIGS. 6(a) and 6(b) are transverse cross-sectional views each schematically showing a cross section along the thickness direction of a part of an embodiment of the absorber of the present invention. 図７（ａ）～図７（ｃ）は、それぞれ、実施例又は比較例における第１コア側積層構造の模式的な平面図である。FIGS. 7(a) to 7(c) are schematic plan views of the first core side laminated structure in the example or comparative example, respectively. 図８は、第１シート、第１コア及び中間シートからなる積層構造（第１コア側積層構造）の吸液前後の厚み変化量あたりの縦方向及び横方向の曲げ剛性変化率ＢＲの測定用サンプルの調製方法の説明図である。FIG. 8 is for measuring the bending rigidity change rate BR in the longitudinal and lateral directions per thickness change before and after liquid absorption of a laminated structure (first core side laminated structure) consisting of a first sheet, a first core, and an intermediate sheet. FIG. 2 is an explanatory diagram of a sample preparation method. 図９は、第１シート、第１コア及び中間シートからなる積層構造（第１コア側積層構造）の吸液前後の厚み変化量あたりの斜め方向の曲げ剛性変化率ＢＲの測定用サンプルの調製方法の説明図である。FIG. 9 shows the preparation of a sample for measuring the bending rigidity change rate BR in the diagonal direction per thickness change before and after liquid absorption of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet. It is an explanatory diagram of a method.

以下、本発明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。なお、以下の図面の記載において、同一又は類似の部分には、同一又は類似の符号を付している。図面は基本的に模式的なものであり、各寸法の比率などは現実のものとは異なる場合がある。 DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on preferred embodiments thereof with reference to the drawings. In addition, in the description of the following drawings, the same or similar parts are given the same or similar symbols. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

本発明の吸収性物品は、着用者の前後方向、すなわち腹側から股間部を介して背側に延びる方向に対応する縦方向（図中符号「Ｘ」で示す）と、該縦方向に直交する横方向（図中符号「Ｙ」で示す）とを有する。
以下の説明において、特に説明しない限り、縦方向は、吸収性物品の縦方向又はその構成部材（例えば吸収体）における縦方向に沿う方向であり、横方向は、吸収性物品の横方向又はその構成部材における横方向に沿う方向である。
本発明の吸収性物品は、体液を吸収保持する吸収体（図中符号「１０」で示す）を備えている。
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使い捨ておむつ１が示されており、おむつ１は前記の構成を備えている。 The absorbent article of the present invention has a vertical direction (indicated by the symbol "X" in the figure) corresponding to the front-back direction of the wearer, that is, a direction extending from the ventral side to the dorsal side via the crotch area, and a vertical direction perpendicular to the vertical direction. It has a horizontal direction (indicated by the symbol "Y" in the figure).
In the following description, unless otherwise specified, the longitudinal direction refers to the longitudinal direction of the absorbent article or the longitudinal direction of its constituent members (for example, an absorbent body), and the lateral direction refers to the lateral direction of the absorbent article or the longitudinal direction thereof. This is the direction along the lateral direction of the component.
The absorbent article of the present invention includes an absorbent body (indicated by the reference numeral "10" in the figure) that absorbs and retains body fluids.
1 and 2 show a disposable diaper 1 which is an embodiment of the absorbent article of the present invention, and the diaper 1 has the above-described configuration.

おむつ１は、縦方向Ｘにおいて、着用者の股間部に配され、陰茎等の***部に対向する***部対向部（図示せず）を含む股下部Ｂと、該股下部Ｂよりも着用者の腹側（前側）に配される腹側部Ａと、該股下部Ｂよりも着用者の背側（後側）に配される背側部Ｃとの３つに区分される。腹側部Ａ及び背側部Ｃは、典型的にはそれぞれ、おむつ１の着用時に着用者の胴周りに配される胴周り部を含む。腹側部Ａはおむつ１の前身頃の一部であり、背側部Ｃはおむつ１の後身頃の一部である。股下部Ｂは、おむつ１の前身頃から後身頃にわたって存在する。
本発明において、腹側部Ａ、股下部Ｂ及び背側部Ｃは、展開且つ伸長状態のおむつ１を縦方向Ｘに三等分した場合の各領域であり得る。ここでいう「展開且つ伸長状態」とは、おむつを図１に示す如き展開状態とし、その展開状態のおむつを各部の弾性部材を伸長させて設計寸法（弾性部材の影響を一切排除した状態で平面状に広げたときの寸法と同じ）となるまで拡げた状態をいう。 In the longitudinal direction It is divided into three parts: a ventral part A disposed on the ventral side (front side) of the wearer, and a dorsal part C disposed on the dorsal side (rear side) of the wearer with respect to the crotch area B. The abdominal part A and the dorsal part C typically each include a waist part that is placed around the wearer's waist when the diaper 1 is worn. The ventral side part A is a part of the front body of the diaper 1, and the back side part C is a part of the back body of the diaper 1. The crotch area B exists from the front body to the back body of the diaper 1.
In the present invention, the abdominal part A, the crotch part B, and the dorsal part C can be each area when the diaper 1 in the unfolded and stretched state is divided into three equal parts in the longitudinal direction X. The term "expanded and stretched state" as used herein means that the diaper is in the unfolded state as shown in Figure 1, and the diaper in the unfolded state is adjusted to the design dimensions (with no influence of the elastic members) by stretching the elastic members of each part. The state in which it is expanded until it has the same dimensions as when expanded flat.

おむつ１はいわゆる展開型の使い捨ておむつであり、図１に示すように、おむつ１の背側部Ｃの縦方向Ｘに沿う両側縁部に、止着部７を有する止着部材８を備えるとともに、腹側部Ａの非肌対向面に、止着部７が止着可能な止着領域９を備える。
またおむつ１は、着用者が***した尿等の体液を吸収保持する吸収体１０を備えた吸収性本体２と、該吸収性本体２の周縁から外方に延出するフラップ部５とを備える。 The diaper 1 is a so-called deployable disposable diaper, and as shown in FIG. , the non-skin-facing surface of the abdominal part A is provided with a fastening area 9 to which the fastening part 7 can be fastened.
The diaper 1 also includes an absorbent body 2 including an absorbent body 10 that absorbs and retains body fluids such as urine excreted by the wearer, and a flap portion 5 extending outward from the periphery of the absorbent body 2. .

吸収性本体２は、肌対向面を形成する液透過性の表面シート３、非肌対向面を形成する液不透過性若しくは液難透過性又は撥水性の裏面シート４、及び両シート３，４間に介在配置された液保持性の吸収体１０を具備し、これらが接着剤等の公知の接合手段により一体化されて構成されている。吸収性本体２は、腹側部Ａから背側部Ｃにわたって縦方向Ｘに延在している。表面シート３及び裏面シート４としては、それぞれ、この種の吸収性物品に従来用いられているものを特に制限なく用いることができる。表面シート３としては例えば、各種の不織布、開孔フィルムを用いることができる。裏面シート４としては例えば、樹脂フィルム、樹脂フィルムと不織布との積層体を用いることができる。 The absorbent main body 2 includes a liquid-permeable top sheet 3 forming a skin-facing surface, a liquid-impermeable, slightly liquid-permeable, or water-repellent back sheet 4 forming a non-skin-facing surface, and both sheets 3, 4. It has a liquid-retaining absorbent body 10 interposed therebetween, and these are integrated by known bonding means such as adhesive. The absorbent main body 2 extends in the longitudinal direction X from the ventral side part A to the dorsal side part C. As the top sheet 3 and the back sheet 4, those conventionally used for this type of absorbent article can be used without particular limitation. As the topsheet 3, for example, various nonwoven fabrics and perforated films can be used. As the back sheet 4, for example, a resin film or a laminate of a resin film and a nonwoven fabric can be used.

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）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から近い側であり、「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に向けられる面、すなわち相対的に着用者の肌から遠い側である。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。本願の図２及び図４～図６（厚み方向に沿う断面図）においては、各構成部材（例えば吸収体１０）の上面（相対的に上方に位置する面）が肌対向面、下面（相対的に下方に位置する面）が非肌対向面である。 As used herein, "skin-facing surface" refers to the surface of an absorbent article or its constituent members (e.g. absorbent body) that faces the wearer's skin when the absorbent article is worn, that is, the surface facing the wearer's skin relative to the wearer's skin. The "non-skin-facing surface" refers to the surface of the absorbent article or its constituent members that faces away from the skin when the absorbent article is worn, i.e., the side that is relatively far from the wearer's skin. It's on the side. Note that "when worn" here means a state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained. In FIG. 2 and FIGS. 4 to 6 (cross-sectional views along the thickness direction) of the present application, the upper surface (relatively located above) of each component (for example, the absorber 10) is the skin-facing surface, and the lower surface (relatively The surface located below the skin) is the non-skin facing surface.

フラップ部５は、吸収性本体２の周縁から外方に延出した部材によって構成されており、吸収体の非配置部である。本実施形態では、図２に示すように、表面シート３は、吸収体１０の肌対向面の全域を被覆し、裏面シート４は、吸収体１０の非肌対向面の全域を被覆し、両シート３，４は更に、吸収性本体２の縦方向Ｘに沿う両側縁から横方向Ｙの外方に延出し、後述する防漏カフ形成用シート６０とともにフラップ部５の一部（吸収性本体２の縦方向Ｘに沿う両側縁及び該両側縁の仮想延長線から横方向Ｙの外方に延出するサイドフラップ部）を形成している。フラップ部５を構成する複数の部材どうしは、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。 The flap portion 5 is constituted by a member extending outward from the periphery of the absorbent main body 2, and is a non-disposed portion of the absorbent body. In this embodiment, as shown in FIG. 2, the topsheet 3 covers the entire skin-facing surface of the absorbent core 10, and the backsheet 4 covers the entire non-skin-facing surface of the absorbent core 10, and both The sheets 3 and 4 further extend outward in the horizontal direction Y from both side edges of the absorbent body 2 along the longitudinal direction 2 and side flaps extending outward in the lateral direction Y from the imaginary extension lines of the both side edges are formed. The plurality of members constituting the flap portion 5 are joined to each other by known joining means such as adhesive, heat sealing, and ultrasonic sealing.

図１及び図２に示すように、吸収性本体２の縦方向Ｘに沿う両側部それぞれに沿って、着用時に着用者の肌側に向かって起立する防漏カフ６が配されている。より具体的には、吸収性本体２の肌対向面における縦方向Ｘに沿う両側部に、液抵抗性又は撥水性で且つ通気性の防漏カフ形成用シート６０を含んで構成された一対の防漏カフ６，６が配されている。これら一対の防漏カフ形成用シート６０，６０は、それぞれ、横方向Ｙの一端側が他の部材（図示の形態では表面シート３及び裏面シート４）に固定されて固定端部、横方向Ｙの他端側が他の部材に非固定の自由端部とされている。各防漏カフ形成用シート６０の自由端部には、防漏カフ形成用弾性部材６１が、縦方向Ｘに伸長状態で固定されることで同方向に伸縮可能に配置されている。おむつ１の着用時には、防漏カフ形成用弾性部材６１の収縮力により、少なくとも股下部Ｂにおいて、防漏カフ形成用シート６０の自由端部側が、他の部材との固定部６２を起立基端として着用者側に起立し、斯かる防漏カフ６の起立により、尿等の***物の横方向Ｙの外方への流出が阻止される。 As shown in FIGS. 1 and 2, leak-proof cuffs 6 that stand up toward the skin of the wearer when worn are arranged along both sides of the absorbent main body 2 in the longitudinal direction X. More specifically, a pair of liquid-resistant or water-repellent and breathable leak-proof cuff forming sheets 60 are provided on both sides of the skin-facing surface of the absorbent main body 2 along the longitudinal direction X. Leak-proof cuffs 6, 6 are arranged. These pair of leak-proof cuff forming sheets 60, 60 are each fixed at one end side in the lateral direction Y to another member (the top sheet 3 and the back sheet 4 in the illustrated form), The other end is a free end that is not fixed to another member. At the free end of each leak-proof cuff-forming sheet 60, a leak-proof cuff-forming elastic member 61 is arranged in a stretched state in the longitudinal direction X so that it can expand and contract in the same direction. When the diaper 1 is worn, the contractile force of the elastic member 61 for forming a leak-proof cuff causes the free end side of the sheet 60 for forming a leak-proof cuff, at least in the crotch area B, to raise the fixing part 62 with other members to the proximal end. The leak-proof cuff 6 stands up on the wearer's side, and by standing up the leak-proof cuff 6, the leakage of urine and other excreta to the outside in the lateral direction Y is prevented.

腹側部Ａ及び背側部Ｃそれぞれの縦方向Ｘの端部すなわちウエスト端部におけるフラップ部５には、複数の胴周りギャザー形成用弾性部材３１が横方向Ｙに伸縮可能に配され、それら複数の弾性部材３１は縦方向Ｘに所定間隔を置いて間欠配置されている。このように、弾性部材３１がその伸縮性が発現される状態で配置されていることにより、その配置部である腹側部Ａ及び背側部Ｃのウエスト端部には、その全周にわたって実質的に連続した環状のウエストギャザー（胴周りギャザー）が形成される。
また、フラップ部５における、おむつ１の着用時に着用者の脚周りに配されるレッグ部には、縦方向Ｘに伸長可能なレッグギャザー形成用弾性部材３２が、少なくとも股下部Ｂの縦方向Ｘの全長にわたって縦方向Ｘに延在しており、これによりおむつ１の着用時には、弾性部材３２の収縮により、レッグ部にレッグギャザーが形成される。
これらのギャザー形成用弾性部材３１，３２は、何れもフラップ部５を構成する複数のシート（本実施形態では表面シート３、裏面シート４及び防漏カフ形成用シート６０のうちの２種）の間に接着剤等の接合手段により伸長状態で挟持固定されている。
前述の各弾性部材６１，３１，３２の形態は特に制限されず、例えば、断面が矩形、正方形、円形、多角形状等の糸状ないし紐状（平ゴム等）のもの、あるいはマルチフィラメントタイプの糸状のもの等を用いることができる。 A plurality of elastic members 31 for forming waist circumference gathers are disposed in the flap part 5 at the end in the longitudinal direction X, that is, at the waist end of each of the abdominal part A and the dorsal part C, so as to be expandable and contractable in the lateral direction Y. The plurality of elastic members 31 are arranged intermittently in the vertical direction X at predetermined intervals. In this way, since the elastic member 31 is arranged in a state where its elasticity is expressed, the waist end portions of the ventral side part A and the dorsal side part C, where the elastic member 31 is arranged, have a substantially A continuous annular waist gather (gather around the waist) is formed.
Further, in the leg portions of the flap portion 5 that are arranged around the wearer's legs when wearing the diaper 1, a leg gather forming elastic member 32 that is stretchable in the longitudinal direction The elastic members 32 extend in the longitudinal direction X over the entire length thereof, and when the diaper 1 is worn, the elastic members 32 contract to form leg gathers in the leg portions.
These gather forming elastic members 31 and 32 are made of a plurality of sheets (in this embodiment, two types of the top sheet 3, the back sheet 4, and the leak-proof cuff forming sheet 60) constituting the flap portion 5. They are clamped and fixed in an extended state by bonding means such as adhesive between them.
The form of each of the elastic members 61, 31, and 32 described above is not particularly limited, and may be, for example, thread-like or string-like (such as flat rubber) with a rectangular, square, circular, or polygonal cross section, or a multifilament-type thread-like material. It is possible to use the following.

おむつ１が具備する吸収体１０は、本発明の吸収体の一実施形態である。図３には、吸収体１０の肌対向面側（表面シート３との対向面側）、図４には、吸収体１０の縦方向Ｘの中央位置での厚み方向に沿う断面が示されている。なお、図４では理解容易の観点から、実際は密着している部材どうしを離して記載しており、図４は必ずしも実態を表しているわけではない。吸収体１０は、図３及び図４に示すように、中間シート１３と、中間シート１３の非肌対向面側（中間シート１３よりも着用者の肌から遠い側）に配される第１シート１１と、中間シート１３の肌対向面側（中間シート１３よりも着用者の肌から近い側）に配される第２シート１２とを具備し、第１シート１１と中間シート１３との間に吸水性の第１コア１４が介在配置され、中間シート１３と第２シート１２との間に、吸液により膨潤する吸水性の第２コア１５が介在配置されている。吸収体１０はこのように、第２シート１２側が、吸収すべき液と最初に接触する受液面側として使用される。 The absorbent body 10 included in the diaper 1 is one embodiment of the absorbent body of the present invention. 3 shows a side of the skin-facing surface of the absorbent core 10 (the surface facing the top sheet 3), and FIG. 4 shows a cross-section along the thickness direction of the absorbent core 10 at the center position in the longitudinal direction X. There is. In addition, in FIG. 4, from the viewpoint of easy understanding, members that are actually in close contact with each other are shown separated from each other, and FIG. 4 does not necessarily represent the actual situation. As shown in FIGS. 3 and 4, the absorbent body 10 includes an intermediate sheet 13 and a first sheet disposed on the non-skin facing side of the intermediate sheet 13 (the side farther from the wearer's skin than the intermediate sheet 13). 11, and a second sheet 12 disposed on the skin-facing side of the intermediate sheet 13 (the side closer to the wearer's skin than the intermediate sheet 13), and between the first sheet 11 and the intermediate sheet 13. A water-absorbing first core 14 is interposed, and a water-absorbing second core 15, which swells due to liquid absorption, is interposed between the intermediate sheet 13 and the second sheet 12. In this way, the second sheet 12 side of the absorber 10 is used as the liquid-receiving surface side that first comes into contact with the liquid to be absorbed.

吸収体１０が備える３種類のシート（第１シート１１、第２シート１２及び中間シート１３）としては、それぞれ、液透過性ないし液吸収性を有するシートを用いることができ、典型的には、繊維を主体とする、すなわち繊維の含有量が５０質量％を超える繊維シートである。前記３種類のシートの構成繊維としては、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（以上、セルロース系繊維）；ポリエチレン及びポリプロピレン等の樹脂を含んで構成される合成繊維等が挙げられ、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。前記３種類のシートの形態としては、例えば、紙、織布、不織布が挙げられ、不織布としては、例えば、エアスルー不織布、ヒートロール不織布、スパンレース不織布、スパンボンド不織布、メルトブローン不織布、スパンボンド－メルトブローン－スパンボンド（ＳＭＳ）不織布が挙げられる。前記３種類のシートは、典型的には、これらの１種からなる単層構造であるが、２種以上が積層一体化した積層構造でもよい。前記３種類のシートは、組成及び形態が互いに同じでもよく、異なっていてもよい。 As the three types of sheets (first sheet 11, second sheet 12, and intermediate sheet 13) included in the absorber 10, sheets having liquid permeability or liquid absorbency can be used, and typically, The fiber sheet is mainly composed of fibers, that is, the fiber content exceeds 50% by mass. The constituent fibers of the three types of sheets include, for example, wood pulp such as softwood pulp and hardwood pulp, natural fibers such as non-wood pulp such as cotton pulp and hemp pulp; modified pulp such as cationized pulp and mercerized pulp ( Synthetic fibers containing resins such as polyethylene and polypropylene (cellulose fibers) are mentioned above, and one type of these can be used alone or two or more types can be used in combination. Examples of the forms of the three types of sheets include paper, woven fabric, and nonwoven fabric, and examples of the nonwoven fabric include air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, and spunbond-meltblown fabric. - Spunbond (SMS) non-woven fabrics. The three types of sheets typically have a single-layer structure made of one of these types, but may also have a laminated structure in which two or more types are laminated and integrated. The three types of sheets may have the same or different compositions and shapes.

本実施形態では、第２シート１２は、その横方向Ｙの長さ（幅）が、吸収体１０の他の構成部材（第１シート１１、中間シート１３、第１コア１４及び第２コア１５）のうちで幅が最大の部分の幅（最大幅）よりも長い、１枚の幅広のシートからなる。より具体的には、本実施形態の第２シート１２は、前記最大幅の２倍以上３倍以下の幅を有し、図４に示すように、第２コア１５の肌対向面の全域を被覆し、且つ第２コア１５の縦方向Ｘに沿う両側縁それぞれから横方向Ｙの外方に延出し、その延出部１２Ｅが、第１シート１１の非肌対向面側に巻きかけられて、該第１シートの非肌対向面の全域を被覆している。つまり第２シート１２は、第１シート１１、中間シート１３、第１コア１４及び第２コア１５を含む積層構造の肌対向面及び非肌対向面の全体を被覆している。 In the present embodiment, the length (width) of the second sheet 12 in the lateral direction Y is the same as that of the other constituent members (the first sheet 11, the intermediate sheet 13, the first core 14, and the second core 15) of the absorbent body 10. ) consists of one wide sheet that is longer than the width of the widest part (maximum width). More specifically, the second sheet 12 of this embodiment has a width that is between twice and three times the maximum width, and covers the entire skin-facing surface of the second core 15, as shown in FIG. It covers and extends outward in the horizontal direction Y from each of both side edges of the second core 15 along the longitudinal direction , covering the entire non-skin facing surface of the first sheet. That is, the second sheet 12 covers the entire skin-facing surface and non-skin-facing surface of the laminated structure including the first sheet 11, intermediate sheet 13, first core 14, and second core 15.

なお、本発明では、第２シート１２は延出部１２Ｅを具備していなくてもよく、第２シート１２は、該第２シート１２と接触する第２コア１５の最大幅と同程度の幅を有していればよい。典型的には、第２シート１２を除く、吸収体１０の他の構成部材（第１シート１１、中間シート１３、第１コア１４及び第２コア１５）は、最大幅すなわち横方向Ｙの最大長さが互いに略同じである。 In addition, in the present invention, the second sheet 12 does not need to include the extension part 12E, and the second sheet 12 has a width comparable to the maximum width of the second core 15 that contacts the second sheet 12. It is sufficient if it has the following. Typically, the other constituent members of the absorbent body 10 (the first sheet 11, the intermediate sheet 13, the first core 14, and the second core 15) other than the second sheet 12 have a maximum width, that is, the maximum width in the lateral direction Y. The lengths are approximately the same.

第１コア１４、すなわち第１シート１１と中間シート１３とに挟まれた層は、吸水性材料として少なくとも吸水性ポリマー２０を含有する。第１コア１４は、その形成材料の９０質量％以上が吸水性ポリマーである点で特徴付けられる。すなわち、第１コア１４の「吸水性ポリマー占有率」（当該コアの形成材料の総質量に対する吸水性ポリマーの含有質量の比率）は９０質量％以上であり、第１コア１４は吸水性ポリマー２０を主体して構成されている。ここでいう「第１コア１４の形成材料」（コア形成材料）とは、第１コア１４を挟んで両側に位置する２枚のシート（具体的には第１シート１１及び中間シート１３）間に存在する物質を意味する。ただし、前記コア形成材料には、その２枚のシートどうしの対向面（内面）に塗布された接着剤は含まれない。したがって、図４中符号２２，２３で示す接着剤は、第１コア１４のコア形成材料ではない。 The first core 14, that is, the layer sandwiched between the first sheet 11 and the intermediate sheet 13, contains at least a water-absorbing polymer 20 as a water-absorbing material. The first core 14 is characterized in that 90% by mass or more of its forming material is a water-absorbing polymer. That is, the "water-absorbing polymer occupancy" (the ratio of the content mass of the water-absorbing polymer to the total mass of the material forming the core) of the first core 14 is 90% by mass or more, and the first core 14 has a water-absorbing polymer 20 It is mainly composed of. The "forming material of the first core 14" (core forming material) here refers to the space between two sheets (specifically, the first sheet 11 and the intermediate sheet 13) located on both sides of the first core 14. means a substance that exists in However, the core forming material does not include the adhesive applied to the opposing surfaces (inner surfaces) of the two sheets. Therefore, the adhesives indicated by reference numerals 22 and 23 in FIG. 4 are not the core forming material of the first core 14.

第１コア１４は、典型的には、吸水性材料として吸水性ポリマー２０のみを含有し、木材パルプ等の吸水性繊維は含有しないか、又は吸水性繊維を含有するとしても、第２コア１５における吸水性繊維の含有量よりもはるかに少ない量（例えば１０質量％以下）である。 The first core 14 typically contains only the water-absorbing polymer 20 as the water-absorbing material and does not contain water-absorbing fibers such as wood pulp, or even if it does contain water-absorbing fibers, the second core 15 The content of water-absorbing fibers is much smaller (for example, 10% by mass or less) than the content of water-absorbing fibers in .

吸水性ポリマー２０は、一般に、水の吸収及び保持が可能なヒドロゲル材料を用いることができ、例えば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、アクリル酸重合体部分ナトリウム塩が挙げられる。吸水性ポリマー２０の形状は特に制限されず、例えば、球状、房状、塊状、俵状、繊維状、不定形状及びこれらの組み合わせの粒子であり得る。第１コア１４（吸収体１０）の製造時における吸水性ポリマー２０の散布の均一性を高めて、吸収体１０の液吸収性能を高める観点から、吸水性ポリマー２０は同一の形状の粒子を用いることが好ましく、球状の粒子であることも好ましい。 As the water-absorbing polymer 20, a hydrogel material capable of absorbing and retaining water can generally be used, and for example, a polymer or copolymer of acrylic acid or an alkali metal salt of acrylic acid can be used. Examples thereof include polyacrylic acid and its salts, and polymethacrylic acid and its salts, and specifically, acrylic acid polymer partial sodium salts. The shape of the water-absorbing polymer 20 is not particularly limited, and may be, for example, spherical, tufted, lump-like, bale-like, fibrous, irregularly shaped, or particles of a combination thereof. From the viewpoint of increasing the uniformity of dispersion of the water-absorbing polymer 20 during the production of the first core 14 (absorbent body 10) and improving the liquid absorption performance of the absorbent body 10, particles of the same shape are used for the water-absorbing polymer 20. is preferable, and spherical particles are also preferable.

接着剤２２，２３は、第１コア１４が含有する吸水性ポリマー２０を第１シート１１及び／又は中間シート１３に固定するとともに、両シート１１，１３どうしを接合する役割を担う。接着剤２２は、第１シート１１における中間シート１３との対向面（内面）に塗布されたものであり、接着剤２３は、中間シート１３における第１シート１１との対向面（内面）に塗布されたものである。接着剤２２，２３としては、この種の吸収性物品において部材どうしの接合に使用可能な接着剤を特に制限無く用いることができ、例えばホットメルト接着剤が挙げられる。接着剤２２と接着剤２３とは、互いに同一の種類の接着剤であってもよく、異なる種類の接着剤であってもよく、典型的には前者である。なお、接着剤２２，２３については後述する。 The adhesives 22 and 23 serve to fix the water-absorbing polymer 20 contained in the first core 14 to the first sheet 11 and/or the intermediate sheet 13, as well as to bond the sheets 11 and 13 together. The adhesive 22 is applied to the surface (inner surface) of the first sheet 11 facing the intermediate sheet 13 , and the adhesive 23 is applied to the surface (inner surface) of the intermediate sheet 13 facing the first sheet 11 . It is what was done. As the adhesives 22 and 23, any adhesive that can be used for bonding members together in this type of absorbent article can be used without particular limitation, such as a hot melt adhesive. The adhesive 22 and the adhesive 23 may be the same type of adhesive or different types of adhesive, and typically the former. Note that the adhesives 22 and 23 will be described later.

第１シート１１側の接着剤２２と、中間シート１３側の接着剤２３とで、接着剤の塗布パターンは同じでもよく、異なっていてもよい。後者の場合の一例として、第１コア１４において吸収すべき液と最初に接触する受液面側の接着剤が、その被塗布面における所定の塗布領域（例えば吸水性ポリマー２０の存在領域）に接着剤の非塗布部が存在するように塗布され、該受液面側とは反対側の接着剤が、その被塗布面における所定の塗布領域に接着剤の非塗布部が実質的に存在しないように塗布（いわゆるべた塗り）された形態を例示できる。接着剤の種類や塗布パターン等によっては、第１コア１４の液透過性や液吸収性能が低下することが懸念されるところ、この形態のように、受液面側は接着剤の非塗布部が存在し、受液面側とは反対側は接着剤の非塗布部が実質的に存在しないように接着剤を塗布することで、斯かる懸念を払拭し得る。
本実施形態では図２に示すように、吸収体１０は第２シート１２側を受液面側として使用されるので、第１コア１４においては、中間シート１３側が受液面側（おむつ１の着用者の肌から相対的に近い側）、第１シート１１側が受液面側とは反対側（おむつ１の着用者の肌から相対的に遠い側）である。そこで、中間シート１３側の接着剤２３の塗布パターンを、接着剤２３の塗布部と非塗布部とが混在するパターンとし、第１シート１１側の接着剤２２の塗布パターンをいわゆるべた塗りとすればよい。接着剤の塗布部と非塗布部とが混在するパターンとしては、例えば、接着剤の塗布部が平面視においてスパイラル状、サミット状、オメガ状、カーテン状、ストライプ状を有している形態が挙げられる。 The adhesive application pattern for the adhesive 22 on the first sheet 11 side and the adhesive 23 on the intermediate sheet 13 side may be the same or different. As an example of the latter case, the adhesive on the liquid-receiving surface of the first core 14, which first comes into contact with the liquid to be absorbed, is applied to a predetermined application area (for example, the area where the water-absorbing polymer 20 is present) on the application surface. The adhesive is applied so that there is a non-applied part of the adhesive, and the adhesive on the side opposite to the liquid-receiving surface side is substantially free of the non-applied part of the adhesive in a predetermined application area on the surface to be coated. An example of this is a form in which the material is coated in this way (so-called solid coating). There is a concern that the liquid permeability and liquid absorption performance of the first core 14 may decrease depending on the type of adhesive, application pattern, etc., but as in this embodiment, the liquid receiving surface side is not coated with adhesive. Such concerns can be eliminated by applying the adhesive so that there is substantially no adhesive-unapplied area on the side opposite to the liquid-receiving surface.
In this embodiment, as shown in FIG. 2, the absorber 10 is used with the second sheet 12 side as the liquid-receiving surface side, so in the first core 14, the intermediate sheet 13 side is the liquid-receiving surface side (diaper 1 The first sheet 11 side is the side opposite to the liquid receiving surface side (the side relatively far from the wearer's skin of the diaper 1). Therefore, the application pattern of the adhesive 23 on the intermediate sheet 13 side is made into a pattern in which areas where the adhesive 23 is applied and non-applied areas coexist, and the application pattern of the adhesive 22 on the first sheet 11 side is set as a so-called solid coating pattern. Bye. Examples of patterns in which adhesive-applied areas and non-applied areas coexist include patterns in which adhesive-applied areas have a spiral shape, a summit shape, an omega shape, a curtain shape, or a stripe shape when viewed from above. It will be done.

なお、本実施形態では、第１コア１４を挟んでその厚み方向の両側、すなわち第１シート１１側及び中間シート１３側の双方に接着剤を塗布しているが、本発明では何れか一方側のみに接着剤を塗布してもよい。第１コア１４を挟んでその両側に配された接着剤の坪量（第１シート１１側及び中間シート１３側の双方に接着剤を塗布している場合はそれらの総坪量）は、吸水性ポリマー２０の固定と液透過性ないし液吸収性能とのバランスの観点から、好ましくは３ｇ／ｍ２以上、より好ましくは５ｇ／ｍ２以上、そして、好ましくは５０ｇ／ｍ２以下、より好ましくは３０ｇ／ｍ２以下である。 In this embodiment, the adhesive is applied on both sides of the first core 14 in the thickness direction, that is, on both the first sheet 11 side and the intermediate sheet 13 side, but in the present invention, the adhesive is applied on either side. Adhesive may be applied only to the surface. The basis weight of the adhesive placed on both sides of the first core 14 (if the adhesive is applied to both the first sheet 11 side and the intermediate sheet 13 side, the total basis weight) is the water absorption From the viewpoint of the balance between fixation of the flexible polymer 20 and liquid permeability or liquid absorption performance, it is preferably 3 g/m 2 or more, more preferably 5 g/m 2 or more, and preferably 50 g/m 2 or less, more preferably It is 30g/ m2 or less.

第２コア１５、すなわち中間シート１３と第２シート１２とに挟まれた層は、吸水性材料として少なくとも吸水性繊維（図示せず）及び吸水性ポリマー２０を含有する。第２コア１５は、典型的には、吸水性材料を主体として構成される。第２コア１５における吸水性材料の含有量は、少なくとも５０質量％以上であり、１００質量％すなわちコア形成材料の全部が吸水性材料でもよい。
第２コア１５における吸水性ポリマー２０としては、第１コア１４に含有されるものと同様のものを用いることができる。
吸水性繊維としては、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（以上、セルロース系繊維）；親水性合成繊維等が挙げられ、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。第２コア１５が含有する吸水性繊維は、典型的にはセルロース系繊維である。 The second core 15, that is, the layer sandwiched between the intermediate sheet 13 and the second sheet 12, contains at least water-absorbing fibers (not shown) and a water-absorbing polymer 20 as water-absorbing materials. The second core 15 is typically composed mainly of a water-absorbing material. The content of the water-absorbing material in the second core 15 is at least 50% by mass or more, and 100% by mass, that is, the entire core forming material may be the water-absorbing material.
As the water-absorbing polymer 20 in the second core 15, the same material as that contained in the first core 14 can be used.
Examples of water-absorbing fibers include wood pulps such as softwood pulp and hardwood pulp, natural fibers such as non-wood pulps such as cotton pulp and hemp pulp; modified pulps such as cationized pulp and mercerized pulp (including cellulose fibers); ); hydrophilic synthetic fibers and the like, and one type of these can be used alone or two or more types can be used in combination. The water absorbent fibers contained in the second core 15 are typically cellulose fibers.

本明細書において、繊維に関して、「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。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、１０％以上であることがより好ましい。一方で、非吸水性繊維は、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。 As used herein, the term "water-absorbing" with respect to fibers is easily understood by those skilled in the art, as in the case of pulp being water-absorbing, for example. Similarly, it can be easily understood that thermoplastic fibers are non-water absorbing. On the other hand, the degree of water absorbency of fibers can be determined by the moisture content measured by the method described below, allowing comparison of relative differences in water absorbency and also defining a more preferable range. The moisture content of the water-absorbing fiber is preferably 6% or more, more preferably 10% or more. On the other hand, the water content of the non-water-absorbing fiber is preferably less than 6%, more preferably less than 4%.

＜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Ｆ（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℃、相対湿度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）製）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Ｆ’（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（％）＝｛（Ｆ－Ｆ’）／Ｆ’｝×１００ <Method for measuring moisture content>
The moisture content was calculated by applying the moisture content test method of JIS P8203. That is, the fiber sample was allowed to stand in a test room at a temperature of 40° C. and a relative humidity of 80% RH for 24 hours, and then the weight F (g) of the fiber sample before absolute drying was measured in the room. Thereafter, the fiber sample was left to stand still for 1 hour in an electric dryer (for example, manufactured by Isuzu Seisakusho Co., Ltd.) at a temperature of 105±2° C. to completely dry the fiber sample. After the absolute drying process, in a test room under standard conditions at a temperature of 20 ± 2°C and a relative humidity of 65 ± 2%, the fiber sample was wrapped in Saran Wrap (registered trademark) manufactured by Asahi Kasei Corporation, and Si silica gel (e.g. ( manufactured by Toyota Kako Co., Ltd.) in a glass desigator (for example, manufactured by Techjam Co., Ltd.) and allowed to stand until the fiber sample reaches a temperature of 20±2°C. Thereafter, the constant weight F' (g) of the fiber sample is weighed, and the moisture content of the fiber sample is determined using the following formula.
Moisture percentage (%) = {(FF')/F'} x 100

第２コア１５の吸水性ポリマー占有率は、好ましくは３０質量％以上、より好ましくは４０質量％以上、そして、好ましくは９０質量％以下、より好ましくは８０質量％以下である。
第２コア１５における吸水性繊維の含有量は、好ましくは２０質量％以上、より好ましくは３０質量％以上、そして、好ましくは９０質量％以下、より好ましくは８０質量％以下である。 The water-absorbing polymer occupancy of the second core 15 is preferably 30% by mass or more, more preferably 40% by mass or more, and preferably 90% by mass or less, more preferably 80% by mass or less.
The content of water absorbent fibers in the second core 15 is preferably 20% by mass or more, more preferably 30% by mass or more, and preferably 90% by mass or less, more preferably 80% by mass or less.

第２コア１５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（吸水性繊維、吸水性ポリマー）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該コア形成材料を、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、第２コア１５である。第２コア１５は、斯かる典型的な製法から、「積繊型吸収性コア」と言うことができる。 The second core 15 can be manufactured according to a conventional method using a known fiber stacking device equipped with a rotating drum. A fiber stacking device typically has a rotating drum with a stacking recess formed on its outer circumferential surface, and a flow path for conveying core forming material (water-absorbing fibers, water-absorbing polymer) to the stacking recess. duct, and the core is conveyed by riding on the air flow generated in the flow path by suction from the inside of the rotating drum while rotating the rotating drum around the rotation axis along the circumferential direction of the drum. The forming material is stacked in the stacking recess. The stacked material formed in the stacking recess by this stacking process is the second core 15. The second core 15 can be referred to as a "stacking type absorbent core" due to this typical manufacturing method.

図１～図４に示すように、第２コア１５の股下部Ｂに対応する（股下部Ｂに配置される）領域には、第２コア１５を厚み方向に貫通する貫通孔１５Ｎが形成されている。貫通孔１５Ｎは、第２コア１５のコア形成材料（吸水性繊維、吸水性ポリマー等）が存在しない前記形成材料非存在部である。ただし、周辺部（後述する貫通孔非形成部１５Ｍ）から脱落した第２コア１５のコア形成材料が貫通孔１５Ｎに入り込むなどして、貫通孔１５Ｎにコア形成材料が存在する場合があり得る。斯かる場合、貫通孔１５Ｎにおけるコア形成材料の坪量は、周辺部（例えば当該貫通孔１５Ｎから縦方向Ｘ又は横方向Ｙに１０ｍｍ以内の領域）に比べて低く、例えば、周辺部の坪量に対して、好ましくは２０％以下、より好ましくは１０％以下である。
第２コア１５において、貫通孔１５Ｎの周辺には、貫通孔１５Ｎが形成されていない貫通孔非形成部１５Ｍが存在しており、貫通孔１５Ｎは貫通孔非形成部１５Ｍで包囲されている。第２コア１５は、典型的には、貫通孔１５Ｎと貫通孔非形成部１５Ｍとからなる。 As shown in FIGS. 1 to 4, a through hole 15N that penetrates the second core 15 in the thickness direction is formed in a region corresponding to the crotch portion B of the second core 15 (arranged in the crotch portion B). ing. The through-hole 15N is a material-free portion where the core-forming material (water-absorbing fiber, water-absorbing polymer, etc.) of the second core 15 does not exist. However, the core forming material of the second core 15 that has fallen off from the peripheral portion (the non-through hole formed portion 15M described later) may enter the through hole 15N, and the core forming material may be present in the through hole 15N. In such a case, the basis weight of the core forming material in the through hole 15N is lower than that of the surrounding area (for example, an area within 10 mm in the vertical direction X or the horizontal direction Y from the through hole 15N); It is preferably 20% or less, more preferably 10% or less.
In the second core 15, a through-hole non-formed portion 15M in which the through-hole 15N is not formed exists around the through-hole 15N, and the through-hole 15N is surrounded by the through-hole non-formed portion 15M. The second core 15 typically includes a through hole 15N and a non-through hole portion 15M.

本実施形態では、貫通孔１５Ｎは、図１及び図３に示すように、第２コア１５を横方向Ｙに二等分して縦方向Ｘに延びる横中心線ＣＬｙを基準として対称に形成され、横中心線ＣＬｙの両側に一対形成されている。この一対の貫通孔１５Ｎは、それぞれ、平面視において縦方向Ｘ（第２コア１５の長手方向）に長い形状、具体的には長方形形状を有している。 In this embodiment, the through holes 15N are formed symmetrically with respect to a horizontal center line CLy that bisects the second core 15 in the horizontal direction Y and extends in the vertical direction X, as shown in FIGS. 1 and 3. , are formed in pairs on both sides of the horizontal center line CLy. The pair of through holes 15N each have a long shape in the vertical direction X (longitudinal direction of the second core 15) in plan view, specifically a rectangular shape.

貫通孔１５Ｎは、おむつ１の着用時の違和感の低減、液の取り込み性や液拡散性の向上等に寄与する。すなわち貫通孔１５Ｎは、これを具備する第２コア１５が体圧等の外力を受けて屈曲するなどして変形する際の変形誘導部（可撓軸）として作用し、これにより吸収体１０の着用者の身体形状に沿う変形が促され、結果として、おむつ１の着用時の違和感が低減され、着用感及びフィット性が向上し得る。また貫通孔１５Ｎは、吸収体１０の吸収対象である尿等の***物の流路として機能し、***物の面方向における拡散を促進し、吸収体１０の液吸収性能の有効活用に寄与し得る。貫通孔１５Ｎはこのような役割を担うものであることから、第２コア１５において体圧等の外力を受けやすく且つ***物が集中しやすい部位に配置されることが好ましい。そのような観点から、貫通孔１５Ｎは、第２コア１５における股下部Ｂに位置する部分に配置されることが好ましい。同様の観点から、貫通孔１５Ｎは、図３に示すように、吸収体１０の縦中心線ＣＬｘを縦方向Ｘに跨いで延在することが好ましい。 The through holes 15N contribute to reducing discomfort when wearing the diaper 1, improving liquid uptake and liquid dispersibility, and the like. In other words, the through hole 15N acts as a deformation guiding portion (flexible shaft) when the second core 15 including the second core 15 bends or deforms in response to an external force such as body pressure. Deformation that conforms to the wearer's body shape is promoted, and as a result, the discomfort when wearing the diaper 1 is reduced, and the feeling of wearing and fit can be improved. In addition, the through holes 15N function as a flow path for excreta such as urine that is to be absorbed by the absorbent body 10, promote diffusion of the excreta in the surface direction, and contribute to effective utilization of the liquid absorption performance of the absorbent body 10. obtain. Since the through-hole 15N plays such a role, it is preferable to arrange it in a part of the second core 15 that is likely to receive external forces such as body pressure and where excrement is likely to be concentrated. From such a viewpoint, the through hole 15N is preferably arranged in a portion of the second core 15 located in the crotch area B. From the same viewpoint, the through hole 15N preferably extends across the longitudinal center line CLx of the absorber 10 in the longitudinal direction X, as shown in FIG.

貫通孔１５Ｎの縦方向Ｘ（長手方向）の長さＬ（図３参照）は、第２コア１５の縦方向Ｘ（長手方向）の長さＬ０（図３参照）に対して、好ましくは２０％以上、より好ましくは３０％以上、そして、好ましくは９５％以下、より好ましくは８５％以下である。
貫通孔１５Ｎの横方向Ｙの長さすなわち幅Ｗ（図３参照）は、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２５ｍｍ以下、より好ましくは２０ｍｍ以下である。
横方向Ｙに隣り合う２個の貫通孔１５Ｎ，１５Ｎどうしの間隔Ｇ（図３参照）は、好ましくは１０ｍｍ以上、より好ましくは１５ｍｍ以上、そして、好ましくは８０ｍｍ以下、より好ましくは６０ｍｍ以下である。 The length L in the vertical direction X (longitudinal direction) of the through hole 15N (see FIG. 3) is preferably 20 mm with respect to the length L0 in the vertical direction % or more, more preferably 30% or more, and preferably 95% or less, more preferably 85% or less.
The length of the through hole 15N in the lateral direction Y, that is, the width W (see FIG. 3) is preferably 1 mm or more, more preferably 2 mm or more, and preferably 25 mm or less, more preferably 20 mm or less.
The distance G (see FIG. 3) between two through holes 15N, 15N adjacent to each other in the lateral direction Y is preferably 10 mm or more, more preferably 15 mm or more, and preferably 80 mm or less, more preferably 60 mm or less. .

貫通孔１５Ｎは、第２コア１５の製造時における、形成材料（吸水性繊維、吸水性ポリマー等）の積繊工程において、該形成材料の積繊を意図的に阻害して形成された部位である。貫通孔１５Ｎを有する第２コア１５は、従来公知の吸収性コアの製造方法に従って製造することができ、典型的には、空気流に乗せて供給した形成材料を、回転ドラムの外周面に形成された集積用凹部に吸引し堆積させて第２コア１５を得る方法において、該集積用凹部として、該集積用凹部の底部における貫通孔１５Ｎに対応する部位が周辺部に比して該回転ドラムの径方向外方に突出しているものを用いることで製造することができる。斯かる方法で得られた第２コア１５において、形成材料が存在しない部分が貫通孔１５Ｎである。 The through-hole 15N is a portion formed by intentionally inhibiting the stacking of the forming material (water-absorbing fiber, water-absorbing polymer, etc.) during the fiber-stacking process of the forming material (water-absorbing fiber, water-absorbing polymer, etc.) during the production of the second core 15. be. The second core 15 having the through holes 15N can be manufactured according to a conventionally known method for manufacturing an absorbent core. Typically, the second core 15 having the through holes 15N is formed on the outer peripheral surface of a rotating drum using a forming material supplied in an air stream. In the method of obtaining the second core 15 by suctioning and depositing the second core 15 in the accumulating recess, the portion corresponding to the through hole 15N at the bottom of the accumulating recess is larger than the peripheral portion of the rotating drum. It can be manufactured by using one that protrudes outward in the radial direction. In the second core 15 obtained by such a method, the portion where the forming material is not present is the through hole 15N.

図２及び図４に示すように、貫通孔１５Ｎと平面視で重なる領域において、第２シート１２と中間シート１３とが、第２コア１５における貫通孔１５Ｎの周辺の貫通孔非形成部１５Ｍと平面視で重なる領域よりも近接している。すなわち図５を参照して、貫通孔１５Ｎと平面視で重なる領域における第２シート１２の肌対向面を基準１２Ｓとして、第２シート１２における貫通孔非形成部１５Ｍに対応する部分の肌対向面の基準１２Ｓからの吸収体１０の厚み方向Ｚに沿う離間距離をＤ１、中間シート１３における貫通孔非形成部１５Ｍに対応する部分の非肌対向面の基準１２Ｓからの厚み方向Ｚに沿う離間距離をＤ２とした場合、離間距離Ｄ２の方が、離間距離Ｄ１に比べて短い。ここでいう「近接」には、両シート１２，１３がわずかな隙間（典型的には５ｍｍ以下の隙間）を置いて離間している状態と、両シート１２，１３が、接着剤等の接合手段を介して又は接合手段を介さずに、密着している状態とが包含される。なお、図５では、理解容易の観点から、図４に示す吸収体１０の構成部材の一部（第２シート１２の延出部１２Ｅ、接着剤２１～２５）の図示を省略している。 As shown in FIGS. 2 and 4, in a region overlapping with the through hole 15N in plan view, the second sheet 12 and the intermediate sheet 13 are connected to the through hole non-formed portion 15M around the through hole 15N in the second core 15. They are closer than regions that overlap in plan view. That is, with reference to FIG. 5, the skin-facing surface of the second sheet 12 in a portion corresponding to the non-through-hole portion 15M, with the skin-facing surface of the second sheet 12 in the area overlapping with the through-hole 15N in plan view as a reference 12S. The separation distance along the thickness direction Z of the absorber 10 from the reference 12S is D1, and the separation distance along the thickness direction Z from the reference 12S of the non-skin facing surface of the portion of the intermediate sheet 13 corresponding to the non-through-hole portion 15M. When D2 is the separation distance D2, the separation distance D2 is shorter than the separation distance D1. Here, "close proximity" includes a state in which both sheets 12 and 13 are separated with a slight gap (typically a gap of 5 mm or less), and a state in which both sheets 12 and 13 are bonded with adhesive or the like. This includes a state in which they are in close contact with each other through a means or without a joining means. In addition, in FIG. 5, from the viewpoint of easy understanding, illustration of some of the constituent members of the absorber 10 shown in FIG. 4 (extending portion 12E of the second sheet 12, adhesives 21 to 25) is omitted.

本実施形態では、図４に示すように、貫通孔１５Ｎと平面視で重なる領域において、第２シート１２と中間シート１３とが、接着剤２４，２５を介して接合され密着している。接着剤２４は、中間シート１３の肌対向面（第１シート１１との対向面とは反対側の面）に塗布され、接着剤２５は、第２シート１２の非肌対向面（第２コア１５ないし中間シート１３との対向面）に塗布されている。また本実施形態では、第１シート１１と第２シート１２の延出部１２Ｅとが接着剤２１を介して接合され、中間シート１３と第２コア１５とが接着剤２４を介して接合されている。このように吸収体１０の構成部材が接着剤を介して一体化されていることにより、吸収体１０の外形形状が一層安定し、所定の性能が一層安定的に発現し得るようになる。接着剤２１，２４，２５としては、この種の吸収性物品において部材どうしの接合に使用可能な接着剤を特に制限無く用いることができ、例えばホットメルト接着剤が挙げられる。接着剤２１，２４，２５の塗布量及び塗布パターンは特に制限されず、適宜設定可能である。 In this embodiment, as shown in FIG. 4, the second sheet 12 and the intermediate sheet 13 are bonded to each other through adhesives 24 and 25 and are in close contact with each other in a region overlapping with the through hole 15N in plan view. The adhesive 24 is applied to the skin-facing surface of the intermediate sheet 13 (the surface opposite to the surface facing the first sheet 11), and the adhesive 25 is applied to the non-skin-facing surface of the second sheet 12 (the surface opposite to the surface facing the first sheet 11). 15 or the surface facing the intermediate sheet 13). Further, in this embodiment, the first sheet 11 and the extending portion 12E of the second sheet 12 are bonded together via the adhesive 21, and the intermediate sheet 13 and the second core 15 are bonded via the adhesive 24. There is. Since the constituent members of the absorbent body 10 are integrated through the adhesive in this way, the external shape of the absorbent body 10 is more stable, and predetermined performance can be more stably expressed. As the adhesives 21, 24, and 25, any adhesive that can be used for bonding members together in this type of absorbent article can be used without particular limitation, such as a hot melt adhesive. The amount and pattern of the adhesives 21, 24, and 25 to be applied are not particularly limited and can be set as appropriate.

なお、第２シート１２と中間シート１３とは、貫通孔１５Ｎと平面視で重なる領域の全域において接合されている、すなわち、該領域の全部が両シート１２，１３の接合部である必要は無く、該領域の少なくとも一部において接合されていればよい。つまり、貫通孔１５Ｎと平面視で重なる領域では、第２シート１２と中間シート１３とが接着剤２４，２５を介して密着している部分と、密着していないが近接している部分とが混在し得る。少なくとも、貫通孔１５Ｎと平面視で重なる領域の好ましくは１０％以上、より好ましくは２０％以上において、第２シート１２と中間シート１３とが接合され密着していることが好ましい。 Note that the second sheet 12 and the intermediate sheet 13 are joined in the entire region that overlaps the through hole 15N in a plan view, that is, the entire region does not need to be the joint between both sheets 12 and 13. , it is sufficient that they are joined in at least a portion of the region. That is, in the area overlapping with the through hole 15N in plan view, there are a portion where the second sheet 12 and the intermediate sheet 13 are in close contact with each other via the adhesives 24 and 25, and a portion where they are not in close contact but are close to each other. Can be mixed. It is preferable that the second sheet 12 and the intermediate sheet 13 are joined and in close contact with each other in at least 10% or more, more preferably 20% or more of the area overlapping with the through-hole 15N in plan view.

吸収体１０は前述したとおり、第２コア１５が貫通孔１５Ｎを有しているため、吸収体１０を具備する吸収性物品の着用時の違和感の低減効果を奏し、また、液の取り込み性、液拡散性に優れ、該吸収性物品の液吸収性能を大幅に向上させ得る。しかしながら一方で、吸収体１０は、貫通孔１５Ｎを有することに起因する前述した不都合、すなわち、吸液後に吸収性物品の外面に吸収体１０の壊れを想起させるような凹凸を発生させることが懸念される。これに対し、本発明では、第２コア１５の非肌対向面側、すなわちおむつ１の外面側（裏面シート４側）に、吸水性ポリマー占有率（コア形成材料の総質量に対する吸水性ポリマーの含有質量の比率）が９０質量％以上の第１コア１４を配置するとともに、少なくとも第１コア１４の股下部Ｂに対応する領域において、吸水性ポリマー２０が均一に分布するようにした。 As described above, since the second core 15 of the absorbent body 10 has the through holes 15N, it has the effect of reducing discomfort when wearing an absorbent article including the absorbent body 10, and also has good liquid uptake properties. It has excellent liquid diffusibility and can significantly improve the liquid absorption performance of the absorbent article. However, on the other hand, there is a concern that the absorbent body 10 has the above-mentioned disadvantage due to having the through holes 15N, that is, the occurrence of unevenness on the outer surface of the absorbent article after liquid absorption, which is reminiscent of breakage of the absorbent body 10. be done. In contrast, in the present invention, the water-absorbing polymer occupancy (the proportion of the water-absorbing polymer relative to the total mass of the core-forming material) is The first core 14 having a content mass ratio of 90% by mass or more was arranged, and the water-absorbing polymer 20 was uniformly distributed at least in the region corresponding to the crotch part B of the first core 14.

そして、前述した構成を有する吸収体１０は、該吸収体１０の吸液状態において、図５（ｂ）に示すように、貫通孔１５Ｎと平面視で重なる領域の肌対向面側及び非肌対向面側に凹部Ｃ１，Ｃ２を有し、該非肌対向面側の凹部Ｃ２の深さＣ２Ｄが、該肌対向面側の凹部Ｃ１の深さＣ１Ｄの４０％以下である。すなわち吸収体１０の吸液状態では、吸収体１０における貫通孔１５Ｎと平面視で重なる領域において、「肌対向面側の凹部Ｃ１の深さＣ１Ｄ×０．４≧非肌対向面側の凹部Ｃ２の深さＣ２Ｄ」という大小関係が成立し、その結果、該吸収体１０の非肌対向面（裏面シート４側）は、該吸収体１０の肌対向面（表面シート３側）に比べて、凹凸の程度（貫通孔非形成部１５Ｍに対応する凸部の頂部と凹部Ｃ１，Ｃ２の底部との高低差）が小さい。このように、吸収体１０の吸液状態において、該吸収体１０の非肌対向面が比較的凹凸の少ない状態となることで、着用中のおむつ１の外面（本実施形態では裏面シート４）に吸収体１０の壊れを想起させるような凹凸が発生する不都合が効果的に防止される。 In the absorbent body 10 having the above-described configuration, when the absorbent body 10 is in a liquid absorption state, as shown in FIG. It has recesses C1 and C2 on the surface side, and the depth C2D of the recess C2 on the non-skin facing surface side is 40% or less of the depth C1D of the recess C1 on the skin facing surface side. That is, in the absorbent state of the absorbent body 10, in a region overlapping with the through-hole 15N in the absorbent body 10 in plan view, "depth C1D of the concave portion C1 on the skin-facing surface side x 0.4 ≧ concave portion C2 on the non-skin-facing surface side". As a result, the non-skin facing surface of the absorbent body 10 (back sheet 4 side) has a depth C2D of The degree of unevenness (height difference between the top of the convex portion corresponding to the non-through-hole portion 15M and the bottom of the concave portions C1 and C2) is small. In this manner, when the absorbent body 10 is in a liquid-absorbing state, the non-skin-facing surface of the absorbent body 10 is in a state with relatively few irregularities, so that the outer surface (in this embodiment, the back sheet 4) of the diaper 1 being worn is This effectively prevents the inconvenience of unevenness that would cause the absorber 10 to break.

吸収体１０においては、第２コア１５の非肌対向面側（おむつ１の外面に近い側）に、吸水性ポリマー占有率が９０質量％以上で且つ吸水性ポリマー２０が均一に分布している第１コア１４が近接配置されており、この第１コア１４が、第２コア１５の吸液に伴う膨潤を抑制する緩衝材として機能するため、第２コア１５の非肌対向面側は、このような緩衝材が近接配置されていない第２コア１５の肌対向面側に比べて、吸液時の膨潤が抑制される。そのため、吸収体１０の吸液状態では、吸収体１０における貫通孔１５Ｎと平面視で重なる領域において、「肌対向面側の凹部Ｃ１の深さＣ１Ｄ×０．４≧非肌対向面側の凹部Ｃ２の深さＣ２Ｄ」という大小関係が成立する。
また、吸収体１０の吸液状態において、貫通孔１５Ｎと平面視で重なる領域の非肌対向面側に凹部Ｃ２が形成されるのは、第２コア１５における貫通孔１５Ｎと該貫通孔１５Ｎに隣接する貫通孔非形成部１５Ｍとの坪量差に起因するものである。すなわち第２コア１５は、貫通孔１５Ｎにおいてコア形成材料を有さず、貫通孔１５Ｎに隣接する貫通孔非形成部１５Ｍにおいてコア形成材料を有しているため、第２コア１５が吸液しそのコア形成材料が膨潤した場合、第１コア１４における第２コア１５の貫通孔非形成部１５Ｍに対応する部分のみが、貫通孔非形成部１５Ｍの膨潤に伴って吸収体１０の厚み方向外方（裏面シート４側）に押圧され、第１コア１４における貫通孔１５Ｎに対応する部分は、第２コア１５の膨潤に伴う押圧をほとんど受けない。このような第２コア１５による吸液膨潤時の第１コア１４に対する押圧力の差が、凹部Ｃ２の形成の要因の１つとなっている。 In the absorbent body 10, the water-absorbing polymer occupancy is 90% by mass or more and the water-absorbing polymer 20 is uniformly distributed on the non-skin-facing surface side of the second core 15 (the side close to the outer surface of the diaper 1). The first core 14 is arranged close to each other, and this first core 14 functions as a buffer material that suppresses swelling due to liquid absorption of the second core 15. Therefore, the non-skin facing surface side of the second core 15 is Swelling during liquid absorption is suppressed compared to the skin-facing surface side of the second core 15 where such a buffer material is not disposed close to the skin. Therefore, in the liquid absorbing state of the absorber 10, in the region overlapping with the through hole 15N in the absorber 10 in plan view, "depth C1D of the recess C1 on the skin-facing surface side x 0.4 ≧ recess on the non-skin-facing surface side" The size relationship "depth C2D of C2" is established.
In addition, in the liquid absorbing state of the absorbent body 10, the recess C2 is formed on the non-skin facing surface side in a region that overlaps with the through hole 15N in plan view. This is due to the difference in basis weight between the adjacent through hole non-formed portion 15M. That is, the second core 15 does not have a core forming material in the through hole 15N, but has a core forming material in the through hole non-forming part 15M adjacent to the through hole 15N, so the second core 15 does not absorb liquid. When the core forming material swells, only the portion of the first core 14 that corresponds to the through-hole-free portion 15M of the second core 15 is moved out of the thickness direction of the absorber 10 due to the swelling of the through-hole-free portion 15M. The portion of the first core 14 that corresponds to the through-hole 15N hardly receives any pressure due to the swelling of the second core 15. This difference in the pressing force of the second core 15 against the first core 14 during liquid absorption and swelling is one of the causes of the formation of the recess C2.

本発明でいう、「吸収体の吸液状態」とは、吸収体を生理食塩水中に３０分間浸漬した後の状態を指す。 In the present invention, the "liquid absorption state of the absorber" refers to the state after the absorber is immersed in physiological saline for 30 minutes.

図５（ｂ）を参照して、吸液状態の吸収体１０における貫通孔１５Ｎと平面視で重なる領域において、非肌対向面側の凹部Ｃ２の深さ（最大深さ）Ｃ２Ｄは、肌対向面側の凹部Ｃ１の深さ（最大深さ）Ｃ１Ｄの４０％以下であり、好ましくは３５％以下、より好ましくは３０％以下である。また、斯かる割合の下限については特に制限はなく、斯かる割合が少ないほど（ゼロに近いほど）、着用中のおむつ１の外面に吸収体１０の壊れを想起させるような凹凸が発生し難くなるため好ましい。 Referring to FIG. 5(b), the depth (maximum depth) C2D of the concave portion C2 on the non-skin facing surface side in the area overlapping the through hole 15N in the absorbent body 10 in the liquid absorbing state in plan view is The depth (maximum depth) C1D of the recess C1 on the surface side is 40% or less, preferably 35% or less, and more preferably 30% or less. Further, there is no particular restriction on the lower limit of such a ratio, and the lower the ratio (the closer it is to zero), the less likely unevenness will occur on the outer surface of the diaper 1 while it is being worn, which may be reminiscent of breakage of the absorbent body 10. Therefore, it is preferable.

吸液後におむつ１の外面に吸収体１０の壊れを想起させるような凹凸の発生を一層確実に防止する観点から、貫通孔１５Ｎと平面視で重なる領域の非肌対向面側の凹部Ｃ２の深さ（最大深さ）Ｃ２Ｄ（図５（ｂ）参照）は、好ましくは３ｍｍ未満、より好ましくは２．０ｍｍ未満である。深さＣ２Ｄの下限については特に制限はなく、ゼロに近いほど好ましい。 From the viewpoint of more reliably preventing the occurrence of unevenness on the outer surface of the diaper 1 that would suggest breakage of the absorber 10 after liquid absorption, the depth of the recess C2 on the non-skin facing surface side in the area overlapping with the through hole 15N in plan view is determined. The depth (maximum depth) C2D (see FIG. 5(b)) is preferably less than 3 mm, more preferably less than 2.0 mm. There is no particular restriction on the lower limit of the depth C2D, and the closer it is to zero, the more preferable it is.

吸液状態の吸収体１０における貫通孔１５Ｎと平面視で重なる領域において、前述した、肌対向面側の凹部Ｃ１の深さＣ１Ｄ×０．４≧非肌対向面側の凹部Ｃ２の深さＣ２Ｄという大小関係を一層確実に成立させる観点から、吸収体１０は、以下の構成Ａを具備することが好ましい。
すなわち図５を参照して、貫通孔１５Ｎと平面視で重なる領域における第２シート１２の肌対向面を基準１２Ｓとして、第２シート１２における貫通孔非形成部１５Ｍに対応する部分の肌対向面の基準１２Ｓからの吸収体１０の厚み方向Ｚに沿う離間距離をＤ１、中間シート１３における貫通孔非形成部１５Ｍに対応する部分の非肌対向面の基準１２Ｓからの厚み方向Ｚに沿う離間距離をＤ２とした場合、離間距離Ｄ１の方が、離間距離Ｄ２に比べて、吸収体１０の吸液に伴う増加の程度が大きい（構成Ａ）。
図５（ａ）は吸収体１０の吸液前の状態、図５（ｂ）は吸収体１０の吸液状態であり、吸液前の離間距離Ｄ１，Ｄ２を符号Ｄ１ａ，Ｄ２ａとし、吸液状態の離間距離Ｄ１，Ｄ２を符号Ｄ２ａ，Ｄ２ｂとしている。前記の「離間距離Ｄ１の方が、離間距離Ｄ２に比べて、吸収体１０の吸液に伴う増加の程度が大きい」というのは、「（Ｄ１ｂ－Ｄ１ａ）＞（Ｄ２ｂ－Ｄ２ａ）」の大小関係が成立することを意味する。
なお、吸液状態の吸収体１０における貫通孔非形成部１５Ｍに対応する部分の第２シート１２の基準１２Ｓからの離間距離Ｄ１ｂは、典型的には、前述した、吸液状態の吸収体１０における貫通孔１５Ｎと平面視で重なる領域の肌対向面側の凹部Ｃ１の深さ（最大深さ）Ｃ１Ｄと一致する。 In the region overlapping with the through-hole 15N in plan view in the absorbent body 10 in a liquid-absorbing state, the depth C1D of the recess C1 on the skin-facing surface side x 0.4≧depth C2D of the recess C2 on the non-skin-facing surface side. From the viewpoint of more reliably establishing this size relationship, it is preferable that the absorbent core 10 has the following configuration A.
That is, with reference to FIG. 5, the skin-facing surface of the second sheet 12 in a portion corresponding to the non-through-hole portion 15M, with the skin-facing surface of the second sheet 12 in the area overlapping with the through-hole 15N in plan view as a reference 12S. The separation distance along the thickness direction Z of the absorber 10 from the reference 12S is D1, and the separation distance along the thickness direction Z from the reference 12S of the non-skin facing surface of the portion of the intermediate sheet 13 corresponding to the non-through-hole portion 15M. is D2, the separation distance D1 increases to a greater extent as the absorber 10 absorbs liquid than the separation distance D2 (configuration A).
5(a) shows the state of the absorbent body 10 before liquid absorption, and FIG. 5(b) shows the state of the absorbent body 10 before liquid absorption. The distances D1 and D2 between the states are denoted by symbols D2 a and D2b. The above-mentioned statement that "the separation distance D1 increases to a greater degree as the absorber 10 absorbs liquid than the separation distance D2" means that the magnitude of "(D1b-D1a)>(D2b-D2a)" It means that a relationship is established.
Note that the separation distance D1b from the reference 12S of the second sheet 12 of the portion corresponding to the through-hole non-formed portion 15M in the absorbent body 10 in the liquid-absorbing state is typically the same as that of the absorbent body 10 in the liquid-absorbing state. The depth (maximum depth) C1D of the recess C1 on the skin-facing surface side in the area overlapping with the through hole 15N in plan view coincides with the depth C1D.

吸液後におむつ１の外面（本実施形態では裏面シート４の非肌対向面）に吸収体１０の壊れを想起させるような凹凸が発生することをより確実に防止する観点から、吸収体１０の吸液状態において、離間距離Ｄ１の方が、離間距離Ｄ２に比べて長いことが好ましい。すなわち図５（ｂ）を参照して、「離間距離Ｄ１ｂ＞離間距離Ｄ２ｂ」の大小関係が成立することが好ましい。 From the viewpoint of more reliably preventing the occurrence of unevenness that may suggest breakage of the absorber 10 on the outer surface of the diaper 1 (in this embodiment, the non-skin facing surface of the backsheet 4) after liquid absorption, the absorber 10 is In the liquid absorption state, it is preferable that the separation distance D1 is longer than the separation distance D2. That is, referring to FIG. 5(b), it is preferable that the magnitude relationship of "separation distance D1b>separation distance D2b" holds true.

第２シート１２における貫通孔非形成部１５Ｍに対応する部分についての前記（Ｄ１ｂ－Ｄ１ａ）、すなわち吸液前の離間距離Ｄ１ａと吸液状態の離間距離Ｄ１ｂとの差分と、中間シート１３における貫通孔非形成部１５Ｍに対応する部分についての前記（Ｄ２ｂ－Ｄ２ａ）、すなわち吸液前の離間距離Ｄ２ａと吸液状態の離間距離Ｄ２ｂとの差分との比率（Ｄ１ｂ－Ｄ１ａ）／（Ｄ２ｂ－Ｄ２ａ）は、（Ｄ１ｂ－Ｄ１ａ）が（Ｄ２ｂ－Ｄ２ａ）よりも大きいことを前提として、好ましくは１．１以上、より好ましくは１．２以上、そして、好ましくは１０．０以下、より好ましくは５．０以下である。 The difference between the separation distance D1a before liquid absorption and the separation distance D1b in the liquid absorption state, and the penetration in the intermediate sheet 13 for the portion corresponding to the non-through-hole portion 15M in the second sheet 12 The above (D2b-D2a) for the portion corresponding to the hole-free portion 15M, that is, the ratio of the difference between the separation distance D2a before liquid absorption and the separation distance D2b in the liquid absorption state (D1b-D1a)/(D2b-D2a) ) is preferably 1.1 or more, more preferably 1.2 or more, and preferably 10.0 or less, more preferably 5, on the premise that (D1b-D1a) is larger than (D2b-D2a). .0 or less.

吸収体１０の薄型化と液吸収性能等の諸性能とのバランスの観点から、第２シート１２における貫通孔非形成部１５Ｍに対応する部分についての吸液前の離間距離Ｄ１ａ（図５（ａ）参照）は、離間距離Ｄ２ａよりも長いことを前提として、好ましくは１．０ｍｍ以上、より好ましくは１．５ｍｍ以上、そして、好ましくは２０ｍｍ以下、より好ましくは１０ｍｍ以下である。
同様の観点から、中間シート１３における貫通孔非形成部１５Ｍに対応する部分についての離間距離Ｄ２ａ（図５（ａ）参照）は、離間距離Ｄ１ａよりも短いことを前提として、好ましくは０．５ｍｍ以上、より好ましくは１．０ｍｍ以上、そして、好ましくは１０ｍｍ以下、より好ましくは５．０ｍｍ以下である。 From the viewpoint of balance between the thinning of the absorber 10 and various performances such as liquid absorption performance, the separation distance D1a (Fig. 5 (a ) is preferably 1.0 mm or more, more preferably 1.5 mm or more, and preferably 20 mm or less, more preferably 10 mm or less, provided that it is longer than the separation distance D2a.
From the same point of view, the separation distance D2a (see FIG. 5(a)) of the portion of the intermediate sheet 13 corresponding to the non-through-hole portion 15M is preferably 0.5 mm on the premise that it is shorter than the separation distance D1a. Above, it is more preferably 1.0 mm or more, and preferably 10 mm or less, and more preferably 5.0 mm or less.

吸液後におむつ１の外面（本実施形態では裏面シート４の非肌対向面）に吸収体１０の壊れを想起させるような凹凸が発生することをより確実に防止する観点から、吸収体１０の吸液状態において、第１コア１４の貫通孔非形成部１５Ｍに対応する部分に比べて、第１コア１４の貫通孔１５Ｎに対応する部分（貫通孔１５Ｎと平面視で重なる部分）の厚みが大きいことが好ましい。すなわち図５（ｂ）を参照して、「第１コア１４の貫通孔非形成部１５Ｍに対応する部分の厚みＴ１＜第１コア１４の貫通孔１５Ｎに対応する部分の厚みＴ２」という大小関係が成立することが好ましい。
厚みＴ１と厚みＴ２との比率は、厚みＴ１＜厚みＴ２を前提として、厚みＴ２／厚みＴ１として、好ましくは１．１以上、より好ましくは１．２以上、そして、好ましくは５．０以下、より好ましくは３．０以下である。
厚みＴ１は、好ましくは０．５ｍｍ以上、より好ましくは１．０ｍｍ以上、そして、好ましくは１０ｍｍ以下、より好ましくは５ｍｍ以下である。
厚みＴ２は、好ましくは１.０ｍｍ以上、より好ましくは２.０ｍｍ以上、そして、好ましくは１５ｍｍ以下、より好ましくは１０ｍｍ以下である。 From the viewpoint of more reliably preventing the occurrence of unevenness that may suggest breakage of the absorber 10 on the outer surface of the diaper 1 (in this embodiment, the non-skin facing surface of the backsheet 4) after liquid absorption, the absorber 10 is In the liquid absorption state, the thickness of the portion of the first core 14 corresponding to the through hole 15N (the portion that overlaps with the through hole 15N in plan view) is greater than that of the portion of the first core 14 corresponding to the through hole non-formed portion 15M. Preferably larger. That is, with reference to FIG. 5(b), the size relationship is "thickness T1 of the portion of the first core 14 corresponding to the through-hole non-formed portion 15M<thickness T2 of the portion of the first core 14 corresponding to the through-hole 15N". It is preferable that the following holds true.
The ratio between thickness T1 and thickness T2 is preferably 1.1 or more, more preferably 1.2 or more, and preferably 5.0 as thickness T 2 /thickness T 1 on the premise that thickness T1 < thickness T2. It is more preferably 3.0 or less.
The thickness T1 is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 10 mm or less, more preferably 5 mm or less.
The thickness T2 is preferably 1.0 mm or more, more preferably 2.0 mm or more, and preferably 15 mm or less, more preferably 10 mm or less.

前述の図５に示す各部の寸法、すなわち凹部Ｃ１，Ｃ２の深さＣ１Ｄ，Ｃ２Ｄ、離間距離Ｄ１（Ｄ１ａ，Ｄ１ｂ），Ｄ２（Ｄ２ａ，Ｄ２ｂ）、及び厚みＴ１，Ｔ２は、それぞれ、吸収体の厚み方向に沿う断面を撮影して得た画像に基づき、画像解析装置（例えば、Ｍｅｄｉａ Ｃｙｂｅｒｍｅｔｉｃｓ社製、Ｉｍａｇｅ－Ｐｒｏ（登録商標）Ｐｌｕｓ）を用いて測定することができる。
吸液前の乾燥状態の吸収体１０の各部の寸法を測定する場合、例えば離間距離Ｄ１ａ，Ｄ２ａを測定する場合は、その状態の吸収体１０を、貫通孔１５Ｎの形成領域の中心を通って横方向Ｙに延びる仮想直線に沿って切断し、その切断面を撮影して、画像解析装置により測定する。
吸液状態の吸収体１０の各部の寸法を測定する場合、例えば深さＣ１Ｄ，Ｃ２Ｄ、離間距離Ｄ１ａ，Ｄ２ａ、厚みＴ１，Ｔ２を測定する場合は、吸液前の乾燥状態の吸収体１０に対し、第２コア１５側における貫通孔１５Ｎの形成領域の中心から２００ｇの生理食塩水を注入し、３０分間静置した後、該中心（生理食塩水の注入点）を通って横方向Ｙに延びる仮想直線に沿って切断し、その切断面を撮影して、画像解析装置により測定する。
前記の「貫通孔１５Ｎの形成領域」は、貫通孔１５Ｎを含む平面視四角形形状の領域のうち面積が最小の領域である。例えば本実施形態では、図３に示すように、吸収体１０（第２コア１５）に平面視長方形形状の一対の貫通孔１５Ｎが形成されているので、この一対の貫通孔１５Ｎを含む最小面積の平面視長方形形状の領域が、貫通孔１５Ｎの形成領域である。したがって、図３に示す吸収体１０を切断する際には、一対の貫通孔１５Ｎに挟まれた領域（横方向Ｙの中央に位置する貫通孔非形成部１５Ｍ）の中心を通って横方向Ｙに延びる仮想直線に沿って切断する。また、図３に示す吸収体１０を吸液状態にする際には、第２コア１５側における一対の貫通孔１５Ｎに挟まれた領域（横方向Ｙの中央に位置する貫通孔非形成部１５Ｍ）の中心に生理食塩水を注入する。また例えば、吸収体１０（第２コア１５）に貫通孔１５Ｎが１個のみ形成されている場合は、該１個の貫通孔１５Ｎ自体が、貫通孔１５Ｎの形成領域であるので、該吸収体１０を切断する際には、該１個の貫通孔１５Ｎの中心を通って横方向Ｙに延びる仮想直線に沿って切断し、該吸収体１０を吸液状態にする際には、該中心に生理食塩水を注入する。 The dimensions of each part shown in FIG. 5 described above, that is, the depths C1D and C2D of the recesses C1 and C2, the separation distances D1 (D1a, D1b), D2 (D2a, D2b), and the thicknesses T1 and T2 of the absorber, respectively Measurement can be performed using an image analysis device (for example, Image-Pro (registered trademark) Plus, manufactured by Media Cybermetics) based on an image obtained by photographing a cross section along the thickness direction.
When measuring the dimensions of each part of the absorbent body 10 in a dry state before liquid absorption, for example, when measuring the separation distances D1a and D2a, the absorbent body 10 in that state is passed through the center of the region where the through hole 15N is formed. It is cut along an imaginary straight line extending in the horizontal direction Y, and the cut surface is photographed and measured by an image analysis device.
When measuring the dimensions of each part of the absorbent body 10 in a liquid-absorbing state, for example, when measuring the depths C1D, C2D, separation distances D1a, D2a, and thicknesses T1, T2, the absorbent body 10 in a dry state before liquid absorption is measured. On the other hand, 200 g of physiological saline was injected from the center of the area where the through hole 15N was formed on the second core 15 side, and after being allowed to stand still for 30 minutes, it passed through the center (the injection point of the physiological saline) in the lateral direction Y. A cut is made along an extending virtual straight line, and the cut surface is photographed and measured using an image analysis device.
The above-mentioned "formation region of the through hole 15N" is a region having the smallest area among the regions having a rectangular shape in a plan view that includes the through hole 15N. For example, in this embodiment, as shown in FIG. 3, a pair of through holes 15N having a rectangular shape in plan view are formed in the absorber 10 (second core 15), so the minimum area including the pair of through holes 15N is The rectangular region in plan view is the formation region of the through hole 15N. Therefore, when cutting the absorbent body 10 shown in FIG. Cut along an imaginary straight line extending to . In addition, when the absorber 10 shown in FIG. ) Inject saline into the center. Further, for example, when only one through hole 15N is formed in the absorbent body 10 (second core 15), the one through hole 15N itself is the formation area of the through hole 15N, so the absorbent body 10 is cut along an imaginary straight line extending in the horizontal direction Y through the center of the one through hole 15N. Inject saline.

吸収体１０の吸液状態において、前述の「肌対向面側の凹部Ｃ１の深さＣ１Ｄ×０．４≧非肌対向面側の凹部Ｃ２の深さＣ２Ｄ」という大小関係を成立させ、本発明の主たる効果の１つである、「吸収性物品の外面に吸収体の壊れを想起させるような凹凸を発生させない」を発現させるためには、前述したように、第１コア１４の吸水性ポリマー占有率を９０質量％以上とし、且つ少なくとも第１コア１４の股下部Ｂに対応する領域において、吸水性ポリマー２０の分布を均一にする必要がある。吸水性ポリマー占有率が９０質量％以上の第１コア１４の少なくとも股下部Ｂに配置される領域において、吸水性ポリマー２０が均一に分布していることで、第１コア１４の該領域は、吸水性ポリマー２０の吸液に伴う膨潤が抑制され、吸液しても膨潤し難い領域となる。このため第１コア１４は、第２コア１５の非肌対向面側（第１コア１４側）の膨潤を抑制し得る緩衝材として機能し、おむつ１の外面（裏面シート４の非肌対向面）に、第２コア１５の非肌対向面側の膨潤に対応した凹凸が形成されることを効果的に阻害し得る。
第１コア１４の吸水性ポリマー占有率は少なくとも９０質量％以上であり、好ましくは９２質量％以上、より好ましくは９５質量％以上である。第１コア１４の吸水性ポリマー占有率は１００質量％でもよい。 In the liquid absorption state of the absorber 10, the above-mentioned size relationship of "depth C1D of the recess C1 on the skin-facing surface side x 0.4 ≧ depth C2D of the recess C2 on the non-skin-facing surface side" is established, and the present invention In order to achieve one of the main effects of ``not generating irregularities on the outer surface of the absorbent article that would suggest breakage of the absorbent body,'' it is necessary to It is necessary that the occupancy is 90% by mass or more, and that the distribution of the water-absorbing polymer 20 is uniform at least in the region corresponding to the crotch area B of the first core 14. In the region disposed at least in the crotch area B of the first core 14 where the water-absorbing polymer occupancy is 90% by mass or more, the water-absorbing polymer 20 is uniformly distributed, so that the region of the first core 14 is Swelling of the water-absorbing polymer 20 due to liquid absorption is suppressed, resulting in a region that is difficult to swell even when liquid is absorbed. Therefore, the first core 14 functions as a buffer material that can suppress the swelling of the non-skin facing surface side of the second core 15 (the first core 14 side), and ) can effectively prevent the formation of unevenness corresponding to swelling on the non-skin facing surface side of the second core 15.
The water-absorbing polymer occupancy of the first core 14 is at least 90% by mass or more, preferably 92% by mass or more, and more preferably 95% by mass or more. The water-absorbing polymer occupancy of the first core 14 may be 100% by mass.

また、第１コア１４における吸水性ポリマー２０の均一分布に関連して、「第１シート１１、第１コア１４及び中間シート１３からなる積層構造」（以下、「第１コア側積層構造」ともいう。）の、下記式（１）で算出される吸液前後の厚み変化量あたりの曲げ剛性変化率をＢＲとした場合、少なくとも第１コア１４の股下部Ｂに対応する領域（すなわち、第１コア１４の吸水性ポリマー２０の分布が均一であることが求められる領域）において、「縦方向Ｘ」、「横方向Ｙ」、及び「両方向Ｘ，Ｙの双方に交差する斜め方向Ｄ」の三方向の該ＢＲが、それぞれ５．０／ｍｍ以下である（ＢＲ≦５．０／ｍｍが成立する）ことが好ましい。ここでいう「斜め方向Ｄ」は、典型的には、両方向Ｘ，Ｙとのなす角度が４５度である方向である。第１コア１４の股下部Ｂに対応する領域のみならず、第１コア１４の全体において、前記三方向でＢＲ≦５．０／ｍｍが成立することがより好ましい。 In addition, in relation to the uniform distribution of the water-absorbing polymer 20 in the first core 14, a "laminated structure consisting of the first sheet 11, the first core 14, and the intermediate sheet 13" (hereinafter also referred to as "first core side laminated structure") ), where BR is the bending stiffness change rate per thickness change before and after liquid absorption calculated by the following formula (1), at least the area corresponding to the crotch part B of the first core 14 (i.e., the area corresponding to the crotch part B of the first core 14 In the area where the distribution of the water-absorbing polymer 20 of one core 14 is required to be uniform, the "vertical direction X", "lateral direction Y", and "diagonal direction D intersecting both directions X and Y" It is preferable that the BR in each of the three directions is 5.0/mm or less (BR≦5.0/mm holds true). The "diagonal direction D" here is typically a direction in which the angle with both directions X and Y is 45 degrees. More preferably, BR≦5.0/mm is satisfied in the three directions, not only in the region corresponding to the crotch portion B of the first core 14 but also in the entire first core 14.

ＢＲ＝（Ｂｗ／Ｂｄ）／Ｔ０ｃ （１）
Ｂｗ：第１コア側積層構造の吸液後の曲げ剛性
Ｂｄ：第１コア側積層構造の吸液前の曲げ剛性
Ｔ０ｃ：下記式（２）で算出される第１コア側積層構造の吸液前後の厚み変化量
Ｔ０ｃ＝Ｔ０ｗ－Ｔ０ｄ （２）
Ｔ０ｗ：第１コア側積層構造の吸液後の４．９ｍＮ／ｃｍ２荷重下での厚み
Ｔ０ｄ：第１コア側積層構造の吸液前の４．９ｍＮ／ｃｍ２荷重下での厚み
Ｔ０ｗ及びＴ０ｄの単位はそれぞれ［ｍｍ］であるので、Ｔ０ｃの単位も［ｍｍ］であり、したがってＢＲの単位は［／ｍｍ］である。 BR=(B w /B d )/T0 c (1)
B w : Bending rigidity of the first core side laminated structure after liquid absorption B d : Bending rigidity of the first core side laminated structure before liquid absorption T0 c : First core side laminated structure calculated by the following formula (2) Amount of change in thickness before and after liquid absorption T0 c = T0 w - T0 d (2)
T0 w : Thickness of the first core side laminated structure after liquid absorption under 4.9 mN/cm 2 loads T0 d : Thickness of the first core side laminated structure before liquid absorption under 4.9 mN/cm 2 loads Since the units of T0 w and T0 d are each [mm], the unit of T0 c is also [mm], and therefore the unit of BR is [/mm].

第１コア側積層構造において縦方向Ｘ、横方向Ｙ及び斜め方向Ｄの三方向でＢＲ≦５．０／ｍｍが成立しているということは、その主体をなす第１コア１４が、吸液に伴う剛性増加が抑制されている、すなわち（Ｂｗ／Ｂｄ）の値が比較的小さくなされていて吸液後も柔軟性を有する、ということである。
またＢＲは、前記式（１）のとおり、第１コア側積層構造の吸液前後の曲げ剛性変化率を、該第１コア側積層構造の吸液前後の厚み変化量で除したものであり、該厚み変化量が比較的大きい、すなわち第１コア１４の吸液後の膨潤度が比較的大きい場合でも、該曲げ剛性変化率が比較的小さい場合には、前記三方向でＢＲ≦５．０／ｍｍが成立し得る。このことは、前記三方向でＢＲ≦５．０／ｍｍが成立し得る第１コア側積層構造は、第１コア１４の吸液による膨潤度の大小を問わず、吸液により第１コア１４内で吸水性ポリマー２０が詰まり難く、第１コア１４が比較的柔らかく膨らむものであることを意味する。
したがって、前記三方向でＢＲ≦５．０／ｍｍが成立する吸収体１０は、吸液による剛性増加が抑制されており、吸液後も柔軟性に優れているため、これを具備するおむつ１は、着用者にゴワゴワとした着用違和感を与え難く、吸液前は勿論のこと、吸液後においても着用感に優れる。 In the first core side laminated structure, BR≦5.0/mm is satisfied in the three directions of the vertical direction This means that the increase in rigidity associated with liquid absorption is suppressed, that is, the value of (B w /B d ) is made relatively small, and it remains flexible even after liquid absorption.
In addition, BR is calculated by dividing the rate of change in bending rigidity of the first core-side laminate structure before and after liquid absorption by the amount of change in thickness of the first core-side laminate structure before and after liquid absorption, as shown in formula (1) above. Even if the amount of change in thickness is relatively large, that is, the degree of swelling of the first core 14 after liquid absorption is relatively large, if the rate of change in bending rigidity is relatively small, BR≦5 in the three directions. 0/mm may hold true. This means that in the first core side laminated structure in which BR≦5.0/mm can be established in the three directions, regardless of the degree of swelling of the first core 14 due to liquid absorption, the first core 14 This means that the water-absorbing polymer 20 is hard to get clogged inside, and the first core 14 is relatively soft and expands.
Therefore, the absorbent body 10 that satisfies BR≦5.0/mm in the three directions has suppressed the increase in rigidity due to liquid absorption and has excellent flexibility even after liquid absorption, so the diaper 10 equipped with the absorbent body 10 has excellent flexibility even after liquid absorption. The material does not give the wearer a stiff and uncomfortable feeling when worn, and has excellent wearing comfort not only before liquid absorption but also after liquid absorption.

吸収体１０において、第１コア側積層構造の前記三方向それぞれのＢＲは、前述したとおり少なくとも５．０／ｍｍ以下が好ましく、より好ましくは４．８／ｍｍ以下、更に好ましくは４．５／ｍｍ以下である。
また、第１コア側積層構造の前記三方向それぞれのＢＲの下限は特に制限されないが、吸収体としての最低限の形状を維持する観点から、好ましくは０．１／ｍｍ以上、より好ましくは０．３／ｍｍ以上である。 In the absorbent body 10, the BR in each of the three directions of the first core side laminated structure is preferably at least 5.0/mm or less, more preferably 4.8/mm or less, still more preferably 4.5/mm, as described above. mm or less.
Further, the lower limit of the BR in each of the three directions of the first core side laminated structure is not particularly limited, but from the viewpoint of maintaining the minimum shape as an absorber, it is preferably 0.1/mm or more, more preferably 0. .3/mm or more.

ＢＲの算出に使用されるＢｗ等の物性値は特に制限されないが、本発明の所定の効果をより一層確実に奏させるようにする観点から、以下のように設定することが好ましい。
第１コア側積層構造の縦方向Ｘ、横方向Ｙ又は斜め方向Ｄの吸液後の曲げ剛性Ｂｗは、吸収体１０の柔軟性向上の観点からは小さいほど好ましく、好ましくは２００ｍＮ・ｃｍ２／ｃｍ以下、より好ましくは１００ｍＮ・ｃｍ２／ｃｍ以下である。Ｂｗの下限については特に制限されないが、吸収体１０の保形性の確保等の観点から、好ましくは０．３ｍＮ・ｃｍ２／ｃｍ以上、より好ましくは０．５ｍＮ・ｃｍ２／ｃｍ以上である。
第１コア側積層構造の縦方向Ｘ、横方向Ｙ又は斜め方向Ｄの吸液前の曲げ剛性Ｂｄは、吸収体１０の柔軟性向上の観点からは小さいほど好ましく、好ましくは１９．６ｍＮ・ｃｍ２／ｃｍ以下、より好ましくは１５ｍＮ・ｃｍ２／ｃｍ以下である。Ｂｄの下限については特に制限されないが、吸収体１０の保形性の確保等の観点から、好ましくは０．１ｍＮ・ｃｍ２／ｃｍ以上、より好ましくは０．２ｍＮ・ｃｍ２／ｃｍ以上である。
第１コア側積層構造の吸液後の４．９ｍＮ／ｃｍ２（＝０．５ｇｆ／ｃｍ２）荷重下での厚み（最大厚み）Ｔ０ｗは、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３０ｍｍ以下、より好ましくは１５ｍｍ以下である。
第１コア側積層構造の吸液前の４．９ｍＮ／ｃｍ２（＝０．５ｇｆ／ｃｍ２）荷重下での厚み（最大厚み）Ｔ０ｄ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５ｍｍ以下、より好ましくは３ｍｍ以下である。
第１コア側積層構造の曲げ剛性Ｂｗ，Ｂｄ及び厚みＴ０ｗ，Ｔ０ｄの測定方法については後述する。 Physical property values such as B w used for calculating BR are not particularly limited, but from the viewpoint of more reliably achieving the predetermined effects of the present invention, it is preferable to set them as follows.
The bending rigidity Bw of the first core-side laminated structure after liquid absorption in the vertical direction /cm or less, more preferably 100 mN·cm 2 /cm or less. The lower limit of B w is not particularly limited, but from the viewpoint of ensuring the shape retention of the absorber 10, it is preferably 0.3 mN·cm 2 /cm or more, more preferably 0.5 mN·cm 2 /cm or more. be.
The bending rigidity B d of the first core-side laminated structure before liquid absorption in the longitudinal direction cm 2 /cm or less, more preferably 15 mN·cm 2 /cm or less. The lower limit of B d is not particularly limited, but from the viewpoint of ensuring the shape retention of the absorber 10, it is preferably 0.1 mN·cm 2 /cm or more, more preferably 0.2 mN·cm 2 /cm or more. be.
The thickness (maximum thickness) T0 w of the first core side laminated structure after liquid absorption under a load of 4.9 mN/cm 2 (=0.5 gf/cm 2 ) is preferably 1 mm or more, more preferably 2 mm or more, The length is preferably 30 mm or less, more preferably 15 mm or less.
The thickness (maximum thickness) T0 d of the first core side laminated structure before liquid absorption under a load of 4.9 mN/cm 2 (=0.5 gf/cm 2 ) is preferably 0.1 mm or more, more preferably 0 .3 mm or more, and preferably 5 mm or less, more preferably 3 mm or less.
The method of measuring the bending rigidity B w , B d and the thickness T0 w , T0 d of the first core-side laminated structure will be described later.

第１コア側積層構造の前記三方向（縦方向Ｘ、横方向Ｙ及び斜め方向Ｄ）それぞれについてＢＲ≦５．０／ｍｍが成立することは、第１コア側積層構造の第１コア１４を構成する吸水性ポリマー２０の分布の均一性を高めることで可能である。換言すれば、第１コア１４における所定の吸水性ポリマー配置領域の全域に吸水性ポリマー２０が均一に分布している場合、該第１コア１４を含む第１コア側積層構造の前記三方向でＢＲ≦５．０／ｍｍが成立し得る。つまり前記ＢＲは、第１コア側積層構造（第１コア１４）における吸水性ポリマーの分布状態の指標となり得る。 The fact that BR≦5.0/mm holds in each of the three directions (vertical direction X, horizontal direction Y, and diagonal direction D) of the first core side laminated structure means that the first core 14 of the first core side laminated structure This is possible by increasing the uniformity of the distribution of the water-absorbing polymer 20. In other words, when the water-absorbing polymer 20 is uniformly distributed over the entire predetermined water-absorbing polymer arrangement region in the first core 14, in the three directions of the first core-side laminated structure including the first core 14. BR≦5.0/mm can be established. In other words, the BR can be an index of the distribution state of the water-absorbing polymer in the first core-side laminated structure (first core 14).

前記の「吸水性ポリマーが均一に分布している」状態、すなわち第１コア側積層構造の前記三方向でＢＲ≦５．０／ｍｍが成立している状態の具体例として、吸水性ポリマー配置領域の平面視（第１コア１４の厚み方向の投影視）において、吸水性ポリマー２０が、巨視的に視認され得る隙間が観察されない態様で配されている状態が挙げられる。ここでいう、「巨視的に視認され得る隙間が観察されない」とは、吸水性ポリマー２０の配置領域を肉眼でみたときに、吸水性ポリマー２０が第１シート１１又は中間シート１３の一方の面（内面）を満遍なく被覆するように配されているが、該配置領域を微視的に見たときに、吸水性ポリマー２０どうしの間の空隙が意図せず形成されることは許容される趣旨である。この空隙は、概ね１０～１０００μｍ程度である。また、第１コア１４における吸水性ポリマー２０の配置領域は、典型的には、第１コア１４の平面視（厚み方向の投影視）における略全域である。 As a specific example of the state in which the water-absorbing polymer is uniformly distributed, that is, the state in which BR≦5.0/mm is established in the three directions of the first core side laminated structure, the water-absorbing polymer arrangement In a plan view of the region (projected view in the thickness direction of the first core 14), the water-absorbing polymer 20 may be arranged in such a manner that no macroscopically visible gap is observed. Here, "no macroscopically visible gap is observed" means that when the area where the water-absorbing polymer 20 is arranged is viewed with the naked eye, the water-absorbing polymer 20 is located on one side of the first sheet 11 or the intermediate sheet 13. Although the water-absorbing polymers 20 are arranged so as to evenly cover the (inner surface), when looking microscopically at the arrangement area, it is acceptable that voids are unintentionally formed between the water-absorbing polymers 20. It is. This void is approximately 10 to 1000 μm in size. Further, the region in which the water-absorbing polymer 20 is disposed in the first core 14 is typically approximately the entire area of the first core 14 in a plan view (projection view in the thickness direction).

本実施形態では前述したとおり、第２コア１５が貫通孔１５Ｎ（図３等参照）を有しており、これにより、おむつ１の着用時の違和感の低減、液の取り込み性や拡散性の向上といった効果が奏される。このような作用効果を奏する貫通孔１５Ｎと平面視で重なる領域において吸水性ポリマーが均一に分布していると、貫通孔１５Ｎによる作用効果がより一層確実に奏され得る。したがって、第１コア１４における貫通孔１５Ｎと平面視で重なる領域において、吸水性ポリマー２０が均一に分布していることが好ましい。すなわち、第１コア側積層構造における貫通孔１５Ｎと平面視で重なる領域の前記三方向においてＢＲ≦５．０／ｍｍが成立することが好ましい。 In this embodiment, as described above, the second core 15 has the through hole 15N (see FIG. 3, etc.), which reduces discomfort when wearing the diaper 1 and improves liquid uptake and diffusion. This effect is produced. If the water-absorbing polymer is uniformly distributed in the region overlapping in plan view with the through-hole 15N that provides such effects, the effects of the through-hole 15N can be more reliably achieved. Therefore, it is preferable that the water-absorbing polymer 20 is uniformly distributed in the region of the first core 14 that overlaps the through hole 15N in plan view. That is, it is preferable that BR≦5.0/mm be satisfied in the three directions of the region overlapping with the through hole 15N in plan view in the first core side laminated structure.

前記三方向でＢＲ≦５．０／ｍｍが成立すること、すなわち第１コア１４において吸水性ポリマー２０が均一に分布していることによる作用効果をより一層確実に奏させるようにする観点から、前記三方向から任意に選択される二方向どうしのＢｗの比率が、それぞれ０．８以上１．２以下、特に０．９以上１．１以下であることが好ましい。例えば第１コア側積層構造において、「縦方向ＸのＢｗ／横方向ＹのＢｗ」、「縦方向ＸのＢｗ／斜め方向ＤのＢｗ」及び「横方向ＹのＢｗ／斜め方向ＤのＢｗ」がそれぞれ前記範囲であることが好ましい。前記三方向から任意に選択される二方向どうしのＢｗの比率をそれぞれ０．８以上１．２以下とすることは、第１コア側積層構造の第１コア１４を構成する吸水性ポリマー２０の分布の均一性を高めることで可能である。 From the viewpoint of ensuring that the effects of BR≦5.0/mm are established in the three directions, that is, the water-absorbing polymer 20 is uniformly distributed in the first core 14, It is preferable that the ratio of B w in two directions arbitrarily selected from the three directions is 0.8 or more and 1.2 or less, particularly 0.9 or more and 1.1 or less. For example, in the first core side laminated structure, "B w in vertical direction X / B w in horizontal direction Y " , "B w in vertical direction X / B w in diagonal direction D", and "B w in horizontal direction Y / diagonal It is preferable that Bw ' ' in direction D is within the above range. Setting the ratio of Bw in two directions arbitrarily selected from the three directions to 0.8 or more and 1.2 or less means that the water-absorbing polymer 20 constituting the first core 14 of the first core side laminated structure This is possible by increasing the uniformity of the distribution of

吸収体１０の吸液状態において、第１コア側積層構造すなわち「第１シート１１、第１コア１４及び中間シート１３からなる積層構造」の圧縮変形率は、「第２シート１２、第２コア１５及び中間シート１３からなる積層構造」（以下、「第２コア側積層構造」ともいう。）の圧縮変形率に比べて大きいことが好ましい。圧縮変形率は、測定対象を圧縮変形させたときの負荷圧力に対する該測定対象の変位量の割合を示すもので、圧縮変形率の数値が大きいほど、おむつ１の着用者の体圧等の外力が作用したときに変形しやすい（圧縮されやすい）ことを意味する。圧縮変形率は下記方法により測定される。 In the absorbent state of the absorbent body 10, the compressive deformation rate of the first core-side laminated structure, that is, the “laminated structure consisting of the first sheet 11, the first core 14, and the intermediate sheet 13” is the same as that of the “second sheet 12, the second core 15 and the intermediate sheet 13" (hereinafter also referred to as "second core side laminate structure"). The compression deformation rate indicates the ratio of the amount of displacement of the measurement target to the load pressure when the measurement target is compressed and deformed. means that it is easily deformed (easily compressed) when Compressive deformation rate is measured by the following method.

＜圧縮変形率の測定方法＞
圧縮変形率は、例えば、カトーテック株式会社ＫＥＳ‐Ｇ５ハンディー圧縮試験機を用いて測定することができる。乾燥状態の測定対象（第１コア側積層構造、第２コア側積層構造）から一定の大きさの切片を切り出し、該切片の質量の２００倍量の生理食塩水に３０分間浸漬したもの（吸液状態の積層構造）をサンプルとして用いる。サンプルを試験機の試験台に取りつけ、面積２ｃｍ２の円形平面を持つ鋼板間で圧縮する。圧縮速度は０．５ｍｍ／ｓｅｃ、圧縮最大荷重は４９０ｍＮ／ｃｍ２（５０ｇｆ／ｃｍ２）とする。４．９ｍＮ／ｃｍ２（０．５ｇｆ／ｃｍ２）荷重時の厚みを厚みＴ０（ｍｍ）とし、４９０ｍＮ／ｃｍ２（５０ｇｆ／ｃｍ２）荷重時の厚みを厚みＴｍ（ｍｍ）としたときに、圧縮変形率（％）は、「１００×（Ｔ０－Ｔｍ）／Ｔ０」として算出することができる。 <Measurement method of compression deformation rate>
The compression deformation rate can be measured using, for example, Kato Tech Co. , Ltd.'s KES-G5 handy compression testing machine. A section of a certain size was cut out from the measurement target in a dry state (first core side laminated structure, second core side laminated structure), and the section was immersed in physiological saline in an amount 200 times the mass of the section for 30 minutes (absorbed). A laminated structure in a liquid state) is used as a sample. The sample is mounted on the test stand of a testing machine and compressed between steel plates with a circular plane with an area of 2 cm 2 . The compression speed is 0.5 mm/sec, and the maximum compression load is 490 mN/cm 2 (50 gf/cm 2 ). When the thickness when loaded with 4.9 mN/cm 2 (0.5 gf/cm 2 ) is taken as thickness T0 (mm), and the thickness when loaded with 490 mN/cm 2 (50 gf/cm 2 ) is taken as thickness Tm (mm). , the compression deformation rate (%) can be calculated as “100×(T0−Tm)/T0”.

本発明者の知見によれば、特許文献１に記載の吸収体は、上層吸収体と下層吸収体との積層構造を有し且つ該上層吸収体に開口（貫通孔）が形成されているところ、該開口の形成位置での液拡散性が高すぎることに起因して、防漏性に改善の余地があり、尿等の体液が上層吸収体と下層吸収体との隙間を介して外部に漏れ出すおそれがある。これに対し、本発明に係る吸収体１０は、第２コア１５（上層吸収体）と第１コア１４（下層吸収体）との積層構造を有し且つ第２コア１５に貫通孔１５Ｎが形成されているものの、前述したとおり第１コア１４において吸水性ポリマー２０が均一に分布しているため、第１コア１４と第２コア１５との間に隙間が生じにくく、特許文献１に記載の吸収体に比べて防漏性に優れる。この第１コア１４における吸水性ポリマーの均一分布に加えて更に、吸収体１０の吸液状態において前記の「第１コア側積層構造の圧縮変形率＞第２コア側積層構造の圧縮変形率」という大小関係が成立すると、第１コア１４と第２コア１５との間に隙間が生じることが一層防止されるため、防漏性が一層向上し得る。 According to the findings of the present inventor, the absorbent body described in Patent Document 1 has a laminated structure of an upper layer absorbent body and a lower layer absorbent body, and an opening (through hole) is formed in the upper layer absorbent body. Due to the liquid dispersibility at the position where the openings are formed, there is room for improvement in leakage prevention, and body fluids such as urine leak outside through the gap between the upper absorbent layer and the lower absorbent layer. There is a risk of leakage. In contrast, the absorbent body 10 according to the present invention has a laminated structure of a second core 15 (upper layer absorbent body) and a first core 14 (lower layer absorbent body), and a through hole 15N is formed in the second core 15. However, as described above, since the water-absorbing polymer 20 is uniformly distributed in the first core 14, it is difficult to form a gap between the first core 14 and the second core 15, and the method described in Patent Document 1 Superior leak-proofing properties compared to absorbers. In addition to the uniform distribution of the water-absorbing polymer in the first core 14, in addition to the above-mentioned "compressive deformation rate of the first core side laminated structure>compressive deformation rate of the second core side laminated structure" in the absorbent state of the absorber 10. When this size relationship is established, the occurrence of a gap between the first core 14 and the second core 15 is further prevented, and the leak-proof performance can be further improved.

吸収体１０の吸液状態において、第１コア側積層構造の圧縮変形率と第２コア側積層構造の圧縮変形率との比率は、前者＞後者を前提として、前者／後者として、好ましくは２．０以上、より好ましくは２．３以上、そして、好ましくは１０以下、より好ましくは５．０以下である。
吸収体１０の吸液状態において、第１コア側積層構造の圧縮変形率は、第２コア側積層構造の圧縮変形率よりも大きいことを前提として、好ましくは４０％以上、より好ましくは４５％以上、そして、好ましくは８０％以下、より好ましくは７５％以下である。
吸収体１０の吸液状態において、第２コア側積層構造の圧縮変形率は、第１コア側積層構造の圧縮変形率よりも小さいことを前提として、好ましくは１０％以上、より好ましくは１５％以上、そして、好ましくは６０％以下、より好ましくは５５％以下である。
吸液状態での第１コア側積層構造及び第２コア側積層構造の圧縮変形率は、例えば、当該積層構造に含まれる吸水性ポリマーの分布状態、吸水性ポリマーの含有比率、当該積層構造におけるシートどうし又はシートと吸水性ポリマーとの接合状態、該接合状態を形成するための接合手段、該接合手段として接着剤を用いる場合は接着剤の種類や坪量等を調整することにより、調整可能である。 In the absorbent state of the absorbent body 10, the ratio of the compressive deformation rate of the first core side laminated structure and the compressive deformation rate of the second core side laminated structure is preferably 2 as former/latter, assuming that the former>latter. It is .0 or more, more preferably 2.3 or more, and preferably 10 or less, more preferably 5.0 or less.
In the absorbent state of the absorbent body 10, the compressive deformation rate of the first core side laminated structure is preferably 40% or more, more preferably 45%, on the premise that the compressive deformation rate of the first core side laminated structure is larger than the compressive deformation rate of the second core side laminated structure. or more, and preferably 80% or less, more preferably 75% or less.
In the absorbent state of the absorber 10, the compressive deformation rate of the second core side laminated structure is preferably 10% or more, more preferably 15%, on the premise that the compressive deformation rate of the second core side laminated structure is smaller than the compressive deformation rate of the first core side laminated structure. or more, and preferably 60% or less, more preferably 55% or less.
The compressive deformation rates of the first core-side laminated structure and the second core-side laminated structure in the liquid-absorbing state are determined by, for example, the distribution state of the water-absorbing polymer contained in the laminated structure, the content ratio of the water-absorbing polymer, and the laminated structure. The bonding state between the sheets or the sheets and the water-absorbing polymer, the bonding means used to form the bonding condition, and when using an adhesive as the bonding means, can be adjusted by adjusting the type of adhesive, basis weight, etc. It is.

吸収体１０について更に説明すると、第１コア側積層構造においては、第１シート１１と中間シート１３とが接着剤２２，２３を介して接合されている。両シート１１，１３の接合形態の一例として、図６（ａ）に示すように、第１シート１１側の接着剤２２及び／又は中間シート１３側の接着剤２３からなる柱状部２６を介して、両シート１１，１３が接合された形態が挙げられる。斯かる柱状部２６を介した接合形態では、両シート１１，１３どうしは密着せずに所定の間隔を置いて近接した状態となる。柱状部２６は、典型的には、第１コア側積層構造の平面視（厚み方向の投影視）において、接着剤２２，２３の塗布領域（吸水性ポリマー２０の存在領域）に規則的な又は不規則な散点状に複数形成される。それら複数の柱状部２６どうしは、高さ（第１コア１４の厚み方向の長さ）が互いに同じである場合があり得るし、異なる場合もあり得る。複数の柱状部２６には、両シート１１，１３間に介在する吸水性ポリマー２０と接合するもの（両シート１１，１３及び吸水性ポリマー２０それぞれと接合するもの）と、吸水性ポリマー２０と接合しないもの（両シート１１，１３のみと接合するもの）とが混在し得る。柱状部２６の形成は、使用する接着剤の種類や塗布量、両シート１１，１３間に介在する吸水性ポリマー２０の坪量や粒径等を適宜調整することによって制御できる。 To further explain the absorbent body 10, in the first core-side laminated structure, the first sheet 11 and the intermediate sheet 13 are bonded via adhesives 22 and 23. As an example of the joining form of both sheets 11 and 13, as shown in FIG. , a configuration in which both sheets 11 and 13 are joined is exemplified. In such a joining form via the columnar portion 26, both sheets 11 and 13 are not in close contact with each other but are in a state in which they are close to each other with a predetermined interval. Typically, the columnar portions 26 are arranged regularly or in the area where the adhesives 22 and 23 are applied (the area where the water-absorbing polymer 20 is present) in a plan view (projected view in the thickness direction) of the first core-side laminated structure. Multiple irregularly scattered dots are formed. The plurality of columnar parts 26 may have the same height (length in the thickness direction of the first core 14) or may have different heights. The plurality of columnar parts 26 include those that are bonded to the water-absorbing polymer 20 interposed between both sheets 11 and 13 (those that are bonded to both sheets 11 and 13 and the water-absorbing polymer 20, respectively), and those that are bonded to the water-absorbing polymer 20. There may be a mixture of sheets that are not joined together (those that are joined only to both sheets 11 and 13). The formation of the columnar portions 26 can be controlled by appropriately adjusting the type and amount of adhesive used, the basis weight and particle size of the water-absorbing polymer 20 interposed between the sheets 11 and 13.

また、第１コア側積層構造においては、図６（ｂ）に示すように、第１シート１１と中間シート１３とが柱状部２６を介して接合された部分と、両シート１１，１３どうしが接着剤２２，２３を介して密着した部分１６とが混在する場合があり得る。なお、図６（ｂ）では、この両シート１１，１３どうしの密着部分１６が、貫通孔１５Ｎと平面視で重なる領域に形成されているが、密着部分１６の形成箇所は特に制限されず、接着剤２２，２３の塗布領域（吸水性ポリマー２０の存在領域）に規則的な又は不規則な散点状に複数形成され得る。ただし、第１コア１４において吸水性ポリマー２０が均一に分布している状態を確実に実現する観点からは、このような両シート１１，１３どうしの密着部分１６は存在しないか、又は存在しても少ないことが好ましい。 In addition, in the first core side laminated structure, as shown in FIG. There may be cases where portions 16 that are in close contact with each other via adhesives 22 and 23 coexist. In addition, in FIG. 6(b), the contact portion 16 between the sheets 11 and 13 is formed in a region that overlaps the through hole 15N in plan view, but the location where the contact portion 16 is formed is not particularly limited. A plurality of dots may be formed regularly or irregularly in the area where the adhesives 22 and 23 are applied (the area where the water-absorbing polymer 20 is present). However, from the viewpoint of ensuring that the water-absorbing polymer 20 is uniformly distributed in the first core 14, such a close contact portion 16 between the sheets 11 and 13 does not exist or does not exist. It is also preferable that the amount is also small.

柱状部２６の形成を容易にする接着剤としては、吸水性ポリマー２０の液吸収に伴う膨潤変化に追随して伸長し得る柔軟性を有するものを用いることが好ましい。このような原料としては、例えば、２－エチルヘキシルアクリレート、ブチルアクリレート、エチルアクリレート、シアノアクリレート、酢酸ビニル、メタクリル酸メチル等をはじめとするビニルモノマーの（共）重合体（エチレン酢酸ビニル共重合体など）等を一種以上含有するアクリル系接着剤、ポリジメチルシロキサンポリマー重合体等を含有するシリコーン系接着剤、並びに、天然ゴム等を含む天然ゴム系接着剤、ポリイソプレン、クロロプレン等を一種以上含有するイソプレン系接着剤、スチレン－ブタジエン共重合体（ＳＢＲ）、スチレン－イソプレン－スチレンブロック共重合体（ＳＩＳ）、スチレン－ブタジエン－スチレンブロック共重合体（ＳＢＳ）、スチレン－エチレン－ブタジエン－スチレンブロック共重合体（ＳＥＢＳ）、スチレン－エチレン－プロピレン－スチレンブロック共重合体（ＳＥＰＳ）を一種以上含有するスチレン系接着剤等といった、ゴム系接着剤等が挙げられる。これらは１種を単独で又は２種以上を組み合わせて用いてもよい。 As the adhesive that facilitates the formation of the columnar portions 26, it is preferable to use an adhesive that has flexibility so that it can expand following the swelling changes caused by the absorption of liquid by the water-absorbing polymer 20. Examples of such raw materials include (co)polymers of vinyl monomers such as 2-ethylhexyl acrylate, butyl acrylate, ethyl acrylate, cyanoacrylate, vinyl acetate, methyl methacrylate, etc. (ethylene vinyl acetate copolymers, etc.) ), silicone adhesives containing polydimethylsiloxane polymers, natural rubber adhesives containing natural rubber, polyisoprene, chloroprene, etc. Isoprene adhesives, styrene-butadiene copolymer (SBR), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butadiene-styrene block copolymer Examples include rubber adhesives such as styrene adhesives containing one or more of polymer (SEBS) and styrene-ethylene-propylene-styrene block copolymer (SEPS). These may be used alone or in combination of two or more.

これらの接着剤のうち、柔軟性及び伸縮性に優れ、吸水性ポリマー２０の膨潤後においても第１シート１１と中間シート１３との接合状態を維持しておくとともに、収縮力を発現させて、両シート１１，１３間に吸水性ポリマー２０を保持させやすくする観点から、第１コア１４に使用される接着剤２２，２３としては、ゴム系接着剤を用いることが好ましく、またゴム系接着剤のうちスチレン系接着剤を用いることが更に好ましい。 Among these adhesives, adhesives are excellent in flexibility and elasticity, maintain the bonded state between the first sheet 11 and the intermediate sheet 13 even after the water-absorbing polymer 20 has swelled, and exhibit shrinkage force. From the viewpoint of easily holding the water-absorbing polymer 20 between the sheets 11 and 13, it is preferable to use a rubber adhesive as the adhesive 22 and 23 used for the first core 14. Among these, it is more preferable to use a styrene adhesive.

接着剤の柔軟性と、シートへの接着性とを両立させる観点から、第１コア１４に使用される接着剤２２，２３は、ホットメルト接着剤であることが好ましい。ホットメルト接着剤としては、例えば、前述した各種接着剤に、石油樹脂やポリテルペン樹脂等の粘着付与剤、パラフィン系オイル等の可塑剤、並びに、必要に応じてフェノール系、アミン系、リン系、ベンズイミダゾール系などの酸化防止剤を含むものとすることができる。 From the viewpoint of achieving both flexibility of the adhesive and adhesiveness to the sheet, the adhesives 22 and 23 used for the first core 14 are preferably hot melt adhesives. Hot melt adhesives include, for example, the various adhesives mentioned above, tackifiers such as petroleum resins and polyterpene resins, plasticizers such as paraffin oil, and, if necessary, phenol-based, amine-based, phosphorus-based, etc. It may contain an antioxidant such as benzimidazole.

第１コア１４に使用される接着剤２２，２３は、粘弾性測定によって得られる緩和時間が、５０℃において好ましくは１秒以上、より好ましくは２秒以上、更に好ましくは３秒以上である。接着剤２２，２３がこのような値を有していることによって、適度な柔軟性及び伸縮性を発現させ、吸水性ポリマー２０の膨潤後においても、第１シート１１と中間シート１３との接合状態が維持され両シート１１，１３間に吸水性ポリマー２０を保持することが可能となる。 The adhesives 22 and 23 used for the first core 14 have a relaxation time determined by viscoelasticity measurement at 50° C. of preferably 1 second or more, more preferably 2 seconds or more, and still more preferably 3 seconds or more. Since the adhesives 22 and 23 have such values, they exhibit appropriate flexibility and elasticity, and even after the water-absorbing polymer 20 has swelled, the first sheet 11 and the intermediate sheet 13 can be bonded together. This state is maintained, making it possible to hold the water-absorbing polymer 20 between the sheets 11 and 13.

粘弾性測定によって得られる接着剤の５０℃における緩和時間は、以下の条件で接着剤の動的粘弾性を測定したときに得られるｔａｎθの値の逆数として算出される。詳細には、回転式レオメーター（Ａｎｔｏｎ ｐａａｒ社製、型式「Ｐｈｙｓｉｃａ ＭＣＲ３０１」）を用い、測定サンプルを下方から支持する平面視円形状の受け板と、該受け板の上方に対向配置される平面視円形状の押し当て板との間に、測定対象の接着剤（接着剤２２，２３）を介在配置させる。この状態での接着剤は平面視円形状をなし、厚み１．５ｍｍ、直径１２ｍｍとなる。測定時の振動数を１Ｈｚ、ひずみ振幅を０．０５％、冷却速度を２℃／分に設定し、１２０℃から－１０℃までの温度範囲で測定する。ｔａｎθは損失弾性率Ｇ”を貯蔵弾性率Ｇ’で除した値である。 The relaxation time at 50° C. of the adhesive obtained by viscoelasticity measurement is calculated as the reciprocal of the value of tanθ obtained when the dynamic viscoelasticity of the adhesive is measured under the following conditions. In detail, a rotary rheometer (manufactured by Anton Paar, model "Physica MCR301") is used, and a receiving plate having a circular shape in a plan view that supports the measurement sample from below, and a flat surface facing above the receiving plate are used. Adhesives to be measured (adhesives 22 and 23) are interposed between the press plate and the circular pressing plate. The adhesive in this state has a circular shape in plan view, and has a thickness of 1.5 mm and a diameter of 12 mm. The measurement frequency is set to 1 Hz, the strain amplitude is set to 0.05%, and the cooling rate is set to 2°C/min, and the measurement is performed in a temperature range from 120°C to -10°C. tanθ is the value obtained by dividing the loss modulus G'' by the storage modulus G'.

本実施形態では、図４に示すように、第２コア１５の肌対向面（第２シート１２との対向面）に接着剤２５が塗布され、また、第２コア１５の非肌対向面（中間シート１３との対向面）に接着剤２４に接着剤が塗布されており、第２コア１５は、接着剤２４，２５を介して両シート１１，１３と接合されている。本発明の主たる効果の１つである、「吸収性物品の外面に吸収体の壊れを想起させるような凹凸を発生させない」をより確実に奏させるようにする観点から、第２コア１５の非肌対向面側の接着剤２４の方が、第２コア１５の肌対向面側の接着剤２５に比べて、単位面積当たりの塗布量（坪量）が多いことが好ましい。「第２コア１５の非肌対向面側の接着剤２４の坪量＞第２コア１５の肌対向面側の接着剤２５の坪量」の大小関係が成立することで、中間シート１３を間に挟んだ第１コア１４と第２コア１５との密着性が一層向上するため、前述した、第１コア１４の少なくとも股下部Ｂに対応する領域において吸水性ポリマー２０が均一に分布していることによる作用効果と相俟って、本発明の主たる効果がより一層確実に奏され得る。 In this embodiment, as shown in FIG. 4, the adhesive 25 is applied to the skin-facing surface of the second core 15 (the surface facing the second sheet 12), and the non-skin-facing surface of the second core 15 ( An adhesive 24 is applied to the surface facing the intermediate sheet 13), and the second core 15 is joined to both sheets 11 and 13 via the adhesives 24 and 25. From the viewpoint of more reliably achieving one of the main effects of the present invention, ie, "not generating irregularities on the outer surface of the absorbent article that would suggest breakage of the absorbent body," the second core 15 is It is preferable that the adhesive 24 on the skin-facing surface has a larger application amount (basis weight) per unit area than the adhesive 25 on the skin-facing surface of the second core 15 . By establishing the magnitude relationship "Basic weight of the adhesive 24 on the non-skin facing side of the second core 15>Basic weight of the adhesive 25 on the skin facing side of the second core 15", the intermediate sheet 13 is Since the adhesion between the first core 14 and the second core 15 sandwiched between the two cores is further improved, the water-absorbing polymer 20 is uniformly distributed at least in the region corresponding to the crotch area B of the first core 14 described above. Coupled with the resulting effects, the main effects of the present invention can be achieved even more reliably.

第２コア１５の非肌対向面側の接着剤２４の坪量と第２コア１５の肌対向面側の接着剤２５の坪量との比率は、前者＞後者を前提として、前者／後者として、好ましくは１．１以上、より好ましくは１．３以上、そして、好ましくは１５以下、より好ましくは１０以下である。
接着剤２４の坪量は、好ましくは３．０ｇ／ｍ２以上、より好ましくは４．５ｇ／ｍ２以上、そして、好ましくは４０ｇ／ｍ２以下、より好ましくは２０ｇ／ｍ２以下である。
接着剤２５の坪量は、好ましくは１．３ｇ／ｍ２以上、より好ましくは１．５ｇ／ｍ２以上、そして、好ましくは３５ｇ／ｍ２以下、より好ましくは１５ｇ／ｍ２以下である。
なお、ここでいう、接着剤の坪量は、接着剤の塗布対象領域（具体的には例えば、第２コア１５の非肌対向面又は肌対向面）の単位面積当たりの接着剤の塗布量である。したがって例えば、接着剤の間欠塗布により塗布対象領域に接着剤の塗布部と非塗布部とが混在している場合、その塗布対象領域の接着剤の坪量は、該非塗布部を加味したものである。 The ratio of the basis weight of the adhesive 24 on the non-skin-facing side of the second core 15 to the basis weight of the adhesive 25 on the skin-facing side of the second core 15 is calculated as the former/latter, assuming that the former>the latter. , preferably 1.1 or more, more preferably 1.3 or more, and preferably 15 or less, more preferably 10 or less.
The basis weight of the adhesive 24 is preferably 3.0 g/m 2 or more, more preferably 4.5 g/m 2 or more, and preferably 40 g/m 2 or less, more preferably 20 g/m 2 or less.
The basis weight of the adhesive 25 is preferably 1.3 g/m 2 or more, more preferably 1.5 g/m 2 or more, and preferably 35 g/m 2 or less, more preferably 15 g/m 2 or less.
Note that the basis weight of the adhesive herein refers to the amount of adhesive applied per unit area of the area to which the adhesive is applied (specifically, for example, the non-skin facing surface or the skin facing surface of the second core 15). It is. Therefore, for example, if an area to be coated has a mixture of adhesive-applied areas and non-applied areas due to intermittent application of adhesive, the basis weight of the adhesive in the area to be applied will be the basis weight of the adhesive-unapplied areas. be.

本実施形態では、前述したとおり図４に示すように、貫通孔１５Ｎと平面視で重なる領域において、第２シート１２と中間シート１３とが接合されているところ、本発明の主たる効果の１つである、「吸収性物品の外面に吸収体の壊れを想起させるような凹凸を発生させない」をより確実に奏させるようにする観点から、更に、中間シート１３と第１シート１１とが接合されていることが好ましい。ここで、中間シート１３と第１シート１１とは、貫通孔１５Ｎと平面視で重なる領域の全域において接合されている、すなわち、該領域の全部が両シート１２，１１の接合部である必要は無く、該領域の少なくとも一部において接合されていればよい。つまり、貫通孔１５Ｎと平面視で重なる領域では、中間シート１３と第１シート１１とが接着剤２２，２３を介して密着している部分と、密着していないが近接している部分とが混在し得る。少なくとも、貫通孔１５Ｎと平面視で重なる領域の好ましくは１０％以上、より好ましくは３０％以上において、中間シート１３と第１シート１１とが接合され密着していることが好ましい。 In this embodiment, as described above, as shown in FIG. 4, the second sheet 12 and the intermediate sheet 13 are joined in the region overlapping with the through hole 15N in plan view, which is one of the main effects of the present invention. In order to more reliably achieve the goal of "not creating irregularities on the outer surface of the absorbent article that would suggest breakage of the absorbent body," the intermediate sheet 13 and the first sheet 11 are further bonded. It is preferable that Here, the intermediate sheet 13 and the first sheet 11 are joined in the entire region that overlaps with the through hole 15N in plan view. In other words, it is not necessary that the entire region is a joint between both sheets 12 and 11. It is sufficient that the area is bonded in at least a portion of the area. That is, in the area overlapping with the through hole 15N in plan view, there are a portion where the intermediate sheet 13 and the first sheet 11 are in close contact with each other via the adhesives 22 and 23, and a portion where they are not in close contact but are close to each other. Can be mixed. It is preferable that the intermediate sheet 13 and the first sheet 11 are joined and in close contact with each other in at least 10% or more, more preferably 30% or more of the area overlapping with the through hole 15N in plan view.

同様の観点から、第１シート１１、第２シート１２及び中間シート１３それぞれの一方の面における接着剤の単位面積当たりの塗布量（坪量）に関し、「中間シート１３＞第１シート１１≧第２シート１２」の大小関係が成立することが好ましい。すなわち、一方の面（肌対向面又は非肌対向面）における接着剤の坪量は、中間シート１３が最も多く、両シート１１，１２は互いに同じか、又は第１シート１１の方が第２シート１２に比べて多いことが好ましい。 From the same point of view, regarding the amount of adhesive applied per unit area (basis weight) on one side of each of the first sheet 11, second sheet 12, and intermediate sheet 13, "intermediate sheet 13>first sheet 11≧th It is preferable that the size relationship between the two sheets 12 is satisfied. That is, the basis weight of the adhesive on one surface (the skin-facing surface or the non-skin-facing surface) is the highest in the intermediate sheet 13, and both sheets 11 and 12 are the same, or the first sheet 11 is the same as the second sheet. It is preferable that the number of sheets is larger than that of the sheet 12.

本発明の所定の効果をより一層確実に奏させるようにする観点から、第１コア１４は、第２コア１５に比べて、吸水性ポリマーの坪量（単位面積当たりの質量）が小さいことが好ましい。すなわち吸水性ポリマーの坪量に関して、「第１コア１４＜第２コア１５」の大小関係が成立することが好ましい。なお、ここでいう「吸水性ポリマーの坪量」は、当該コアが、貫通孔１５Ｎの如き、コア形成材料が存在しない部分を有する場合は、該部分以外の部分における吸水性ポリマーの坪量を意味する。 In order to more reliably achieve the predetermined effects of the present invention, it is preferable that the first core 14 has a smaller basis weight (mass per unit area) of the water-absorbing polymer than the second core 15. preferable. That is, regarding the basis weight of the water-absorbing polymer, it is preferable that the magnitude relationship "first core 14<second core 15" holds true. In addition, the "basis weight of the water-absorbing polymer" herein refers to the basis weight of the water-absorbing polymer in the portion other than the portion where the core forming material does not exist, such as the through hole 15N. means.

第１コア１４の吸水性ポリマーの坪量と第２コア１５の吸水性ポリマーの坪量との比率は、前者＜後者を前提として、後者／前者として、好ましくは１．１以上、より好ましくは１．３以上、そして、好ましくは１０．０以下、より好ましくは５．０以下である。
第１コア１４の吸水性ポリマーの坪量は、好ましくは６０ｇ／ｍ２以上、より好ましくは８０ｇ／ｍ２以上、そして、好ましくは７００ｇ／ｍ２以下、より好ましくは５００ｇ／ｍ２以下である。
第２コア１５の吸水性ポリマーの坪量は、好ましくは６５ｇ／ｍ２以上、より好ましくは７０ｇ／ｍ２以上、そして、好ましくは８００ｇ／ｍ２以下、より好ましくは６００ｇ／ｍ２以下である。 The ratio of the basis weight of the water-absorbing polymer of the first core 14 and the basis weight of the water-absorbing polymer of the second core 15 is preferably 1.1 or more, more preferably 1.1 or more as the latter/former, assuming that the former < the latter. It is 1.3 or more, preferably 10.0 or less, and more preferably 5.0 or less.
The basis weight of the water-absorbing polymer of the first core 14 is preferably 60 g/m 2 or more, more preferably 80 g/m 2 or more, and preferably 700 g/m 2 or less, more preferably 500 g/m 2 or less. .
The basis weight of the water-absorbing polymer of the second core 15 is preferably 65 g/m 2 or more, more preferably 70 g/m 2 or more, and preferably 800 g/m 2 or less, more preferably 600 g/m 2 or less. .

本実施形態では、吸収体１０は、図３に示すように、平面視において一方向に長い形状を有している。本実施形態では、吸収体１０は、おむつ１の縦方向Ｘに長い形状、具体的には長方形形状を有し、吸収体１０の長手方向が縦方向Ｘに一致し、該長手方向と直交する幅方向が横方向Ｙに一致している。また、第１コア１４及び第２コア１５（中間シート１３）も縦方向Ｘに長い形状を有している。なお、本実施形態では、第２コア１５の平面視形状は中間シート１３のそれと実質的に同じである。 In this embodiment, the absorber 10 has a long shape in one direction in plan view, as shown in FIG. In this embodiment, the absorbent body 10 has a long shape in the longitudinal direction X of the diaper 1, specifically a rectangular shape, and the longitudinal direction of the absorbent body 10 coincides with the longitudinal direction The width direction coincides with the horizontal direction Y. Further, the first core 14 and the second core 15 (intermediate sheet 13) also have a long shape in the vertical direction X. In this embodiment, the shape of the second core 15 in plan view is substantially the same as that of the intermediate sheet 13.

そして本実施形態では、吸収体１０は、図３に示すように、該吸収体１０の長手方向中央、すなわち該吸収体１０を縦方向Ｘに二等分して横方向Ｙに延びる仮想的な縦中心線ＣＬｘを境界として、該吸収体１０の長手方向（縦方向Ｘ）の一方側（図３では左側）の方が、該吸収体１０の長手方向（縦方向Ｘ）の他方側（図３では右側）に比べて、吸水性材料（吸水性ポリマー及び吸水性繊維など）が多い。典型的には、吸収体１０のコア形成材料のほぼ全部、具体的には例えばコア形成材料の全質量の１００質量％が吸水性材料であるので、前記のように吸水性材料が吸収体１０の一部に偏在していると、斯かる吸水性材料の偏在が図３に示す如くに吸収体１０の外形形状に反映される。したがって、コア形成材料のほぼ全部が吸水性材料の場合は、前記の「吸収体１０の長手方向一方側の方が、該吸収体１０の長手方向他方側に比べて、吸水性材料が多い」における「吸水性材料」は、「コア形成材料」に換言できる。 In this embodiment, as shown in FIG. With the vertical center line CLx as a boundary, one side (left side in FIG. 3) of the absorbent body 10 in the longitudinal direction (longitudinal direction 3 has more water-absorbing materials (water-absorbing polymers, water-absorbing fibers, etc.) than the right side). Typically, almost all of the core-forming material of the absorbent body 10, specifically, for example, 100% by mass of the total mass of the core-forming material, is a water-absorbing material. If the water-absorbing material is unevenly distributed in a part of the absorbent material, the uneven distribution of the water-absorbing material is reflected in the external shape of the absorbent body 10 as shown in FIG. Therefore, when almost all of the core forming material is a water-absorbing material, "there is more water-absorbing material on one longitudinal side of the absorbent body 10 than on the other longitudinal side of the absorbent body 10" as described above. "Water-absorbing material" can be translated into "core-forming material."

前述の吸収体１０における吸水性材料（コア形成材料）の偏在の形態としては、例えば、１）第１コア１４では吸水性材料が長手方向（縦方向Ｘ）の一方側に偏在し、第２コア１５では吸水性材料が均一に存在している形態、２）第２コア１５では吸水性材料が長手方向（縦方向Ｘ）の一方側に偏在し、第１コア１４では吸水性材料が均一に存在している形態、３）両コア１４，１５で吸水性材料が長手方向（縦方向Ｘ）の一方側に偏在している形態、４）両コア１４，１５のうちの一方で吸水性材料が長手方向（縦方向Ｘ）の一方側に偏在し、他方で吸水性材料が長手方向（縦方向Ｘ）の他方側に偏在しているが、吸収体１０全体としては、長手方向（縦方向Ｘ）の一方側に吸水性材料が偏在している形態などが挙げられる。なお、前記の「吸水性材料（コア形成材料）が均一に存在」というのは、第１コア１４若しくは第２コア１５又は吸収体１０の巨視的な観察（例えば第１コア１４等の肉眼による観察）において、吸水性材料（コア形成材料）が全体的に満遍なく存在していると認められる状態を意味し、第１コア１４等の一部の微視的な観察（例えば第１コア１４等の断面の顕微鏡観察）において初めて確認できるような厳密な意味での均一性は問題としない。 Examples of uneven distribution of the water absorbent material (core forming material) in the absorbent body 10 described above include: 1) In the first core 14, the water absorbent material is unevenly distributed on one side in the longitudinal direction (vertical direction X); 2) In the second core 15, the water-absorbing material is unevenly distributed on one side in the longitudinal direction (vertical direction X), and in the first core 14, the water-absorbing material is uniform. 3) A form in which the water-absorbing material is unevenly distributed on one side in the longitudinal direction (vertical direction The material is unevenly distributed on one side in the longitudinal direction (vertical direction X), and the water absorbent material is unevenly distributed on the other side in the longitudinal direction (vertical direction Examples include a form in which the water-absorbing material is unevenly distributed on one side in the direction (X). Note that "the water-absorbing material (core-forming material) is uniformly present" refers to the macroscopic observation of the first core 14 or the second core 15 or the absorbent body 10 (for example, the macroscopic observation of the first core 14, etc.). This refers to a state in which the water-absorbing material (core forming material) is found to be evenly distributed throughout the microscopic observation of a portion of the first core 14 (e.g., the first core 14, etc.). Uniformity in the strict sense, which can be confirmed for the first time through microscopic observation of a cross section of the material, is not a problem.

本実施形態では、吸水性材料（コア形成材料）の偏在の形態として、図３に示すように、前記２）の形態が採用されている。すなわち第２コア１５は、長手方向（縦方向Ｘ）の中央（吸収体１０の縦中心線ＣＬｘ）を同方向に跨いで延在し、且つ該第２コア１５における吸収体１０の長手方向（縦方向Ｘ）の一方側に位置する部分（図３では左側）の方が、該第２コア１５における吸収体１０の長手方向（縦方向Ｘ）の他方側に位置する部分（図３では右側）に比べて、吸水性材料（コア形成材料）が多い。これに対し、第１コア１４では吸水性材料（コア形成材料）が均一に存在している。 In this embodiment, as shown in FIG. 3, the form 2) above is adopted as the form of uneven distribution of the water-absorbing material (core forming material). That is, the second core 15 extends across the center (vertical center line CLx of the absorbent body 10) in the longitudinal direction (longitudinal direction The portion of the second core 15 located on the other side of the longitudinal direction (vertical direction X) of the absorber 10 (the right side in FIG. ), there are more water-absorbing materials (core forming materials). On the other hand, in the first core 14, the water-absorbing material (core forming material) is uniformly present.

また本実施形態では、図３に示すように、第２コア１５における吸収体１０の長手方向（縦方向Ｘ）の一方側に位置する部分（図３では左側）の方が、第２コア１５における吸収体１０の長手方向（縦方向Ｘ）の他方側に位置する部分（図３では右側）に比べて、主面の面積が大きい。ここでいう「主面」とは、第２コア１５における最大面積を有する面を意味し、通常、吸収すべき液と最初に接触する受液面又は該受液面とは反対側の面であり、あるいは肌対向面又は非肌対向面である。なお、この主面の定義は特に断らない限り、第１コア１４、吸収体１０などの他の部材にも適用される。 Further, in the present embodiment, as shown in FIG. 3, the portion of the second core 15 located on one side (the left side in FIG. 3) of the absorber 10 in the longitudinal direction (vertical direction The area of the main surface is larger than that of the portion located on the other side (the right side in FIG. 3) of the absorber 10 in the longitudinal direction (vertical direction X). The "principal surface" here means the surface with the largest area in the second core 15, and is usually the liquid-receiving surface that first comes into contact with the liquid to be absorbed or the surface opposite to the liquid-receiving surface. Yes, or a skin-facing surface or a non-skin-facing surface. Note that this definition of the main surface is also applied to other members such as the first core 14 and the absorbent body 10, unless otherwise specified.

更に説明すると、図３に示す如き平面視において、第１コア１４（中間シート１３）は長方形形状を有し、第２コア１５に比べて主面の面積が大きく、また第２コア１５は、第１コア１４（中間シート１３）の周縁に囲まれた領域に収まるように配置され、第１コア１４の周縁よりも外方には延出していない。
第２コア１５は、第１コア１４（中間シート１３）に比べて、長手方向（縦方向Ｘ）の長さが短く、第２コア１５の縦方向Ｘの長さと第１コア１４のそれとの比率は、前者＜後者を前提として、後者／前者として、好ましくは１．０５以上、より好ましくは１．１以上、そして、好ましくは１．７以下、より好ましくは１．６以下である。
また第２コア１５は、幅方向（横方向Ｙ）の長さ（幅）が長手方向の全長にわたって一定ではなく、相対的に幅広で主面の面積が大きい幅広部１５Ａと、相対的に幅狭で主面の面積が小さい幅狭部１５Ｂとを長手方向（縦方向Ｘ）に有している。
幅広部１５Ａにおける幅狭部１５Ｂ寄りの部分は、幅狭部１５Ｂ側に向かって幅（横方向Ｙの長さ）が漸次減少している。
中間シート１３における第２コア１５の配置面（本実施形態では中間シート１３の肌対向面）の周縁部、特に幅狭部１５Ｂの横方向Ｙの外方には、第２コア１５が配置されずに中間シート１３が露出している部分が存在し、この中間シート１３の露出部分にて、該中間シート１３と第２シート１２とが接着剤２４，２５を介して接合されている（図４参照）。 To explain further, in plan view as shown in FIG. 3, the first core 14 (intermediate sheet 13) has a rectangular shape and has a larger main surface area than the second core 15. It is arranged so as to fit within a region surrounded by the periphery of the first core 14 (intermediate sheet 13), and does not extend outward beyond the periphery of the first core 14.
The second core 15 has a shorter length in the longitudinal direction (vertical direction X) than the first core 14 (intermediate sheet 13), and the length of the second core 15 in the longitudinal direction The ratio is preferably 1.05 or more, more preferably 1.1 or more, and preferably 1.7 or less, more preferably 1.6 or less, on the premise that former<latter.
Further, the length (width) in the width direction (horizontal direction Y) is not constant over the entire length in the longitudinal direction, and the second core 15 has a wide portion 15A that is relatively wide and has a large main surface area, and a wide portion 15A that is relatively wide and has a large main surface area. It has a narrow portion 15B having a narrow principal surface area in the longitudinal direction (vertical direction X).
The width (length in the lateral direction Y) of the wide portion 15A near the narrow portion 15B gradually decreases toward the narrow portion 15B.
The second core 15 is disposed at the peripheral edge of the surface of the intermediate sheet 13 on which the second core 15 is disposed (in this embodiment, the skin-facing surface of the intermediate sheet 13), particularly on the outer side of the narrow portion 15B in the lateral direction Y. There is a portion where the intermediate sheet 13 is exposed, and at this exposed portion of the intermediate sheet 13, the intermediate sheet 13 and the second sheet 12 are joined via adhesives 24 and 25 (see FIG. (see 4).

幅広部１５Ａの横方向Ｙの最大長さ（最大幅）と幅狭部１５Ｂの最大幅との比率は、前者／後者として、好ましくは１．１以上、より好ましくは１．２以上、そして、好ましくは５．５以下、より好ましくは３．０以下である。
幅広部１５Ａの縦方向Ｘの長さと幅狭部１５Ｂの縦方向Ｘの長さとの比率は、後者／前者として、好ましくは１．２以上、より好ましくは１．５以上、そして、好ましくは７．０以下、より好ましくは５．０以下である。 The ratio of the maximum length (maximum width) in the lateral direction Y of the wide portion 15A to the maximum width of the narrow portion 15B is preferably 1.1 or more, more preferably 1.2 or more as the former/latter, and It is preferably 5.5 or less, more preferably 3.0 or less.
The ratio of the length of the wide portion 15A in the longitudinal direction X to the length of the narrow portion 15B in the longitudinal direction X is preferably 1.2 or more , more preferably 1.5 or more, and preferably is 7.0 or less, more preferably 5.0 or less.

本実施形態では、図１に示すように、吸収体１０は、その長手方向において吸水性材料（コア形成材料）が偏在している側、すなわち第２コア１５の幅広部１５Ａ側が、おむつ１の腹側部Ａ寄りに位置するように配置されている。おむつ１の構成部材としての吸収体１０においては通常、吸収すべき体液が特定の箇所に集中し、具体的には、股下部Ｂ若しくはおむつ１の縦方向Ｘの中央部、又はこれらに加えて腹側部Ａにおける股下部Ｂ寄りの領域に集中するので、それらの液が集中する領域に、吸収体１０における相対的に吸水性材料（コア形成材料）が多く存在する部分が位置するように、吸収体１０を配置することが好ましい。そうすることで、吸収体１０の液吸収性能と薄型化の両立が図られるようになる。 In the present embodiment, as shown in FIG. 1, the side of the absorbent body 10 where the water-absorbing material (core forming material) is unevenly distributed in the longitudinal direction, that is, the wide portion 15A side of the second core 15 is the side of the diaper 1. It is arranged so as to be located closer to the abdominal part A. In the absorbent body 10 as a constituent member of the diaper 1, the body fluid to be absorbed usually concentrates in a specific location, specifically, in the crotch area B or the central part in the longitudinal direction X of the diaper 1, or in addition to these. Since the liquid is concentrated in the area near the crotch area B in the abdominal part A, the portion of the absorbent body 10 where a relatively large amount of water-absorbing material (core forming material) exists is located in the area where these liquids are concentrated. , it is preferable to arrange the absorber 10. By doing so, it becomes possible to achieve both liquid absorption performance and thinning of the absorber 10.

ＪＩＳ Ｐ８１４１に準じて測定されるクレム吸水高さに関し、「第１シート１１≦第２シート１２＜中間シート１３」の大小関係が成立し、且つ中間シート１３の該クレム吸水高さが５分で２０ｍｍ以上であることが好ましく、２５ｍｍ以上であることがより好ましい。前記大小関係が成立することは、主として、液を素早く吸収して面方向に拡散することで第１コア１４の吸水性ポリマー２０の利用効率を高めることに有効であり、中間シート１３のクレム吸水高さが前記範囲にあることは、主として、液の面方向への拡散性を高めることに有効である。したがって、これらを満たす吸収体１０は、液吸収性能に特に優れたものとなる。クレム吸水高さは液保持性の指標であり、クレム吸水高さが高いほど、繊維シートの液保持性が高いものである。 Regarding the Klemm water absorption height measured according to JIS P8141, the magnitude relationship of "first sheet 11 ≦ second sheet 12 < intermediate sheet 13" is established, and the Klemm water absorption height of the intermediate sheet 13 is 5 minutes. It is preferably 20 mm or more , and more preferably 25 mm or more. Establishment of the above-mentioned size relationship is mainly effective in increasing the utilization efficiency of the water-absorbing polymer 20 of the first core 14 by quickly absorbing liquid and diffusing it in the surface direction. Having the height within the above range is mainly effective in increasing the dispersibility of the liquid in the surface direction. Therefore, the absorbent body 10 that satisfies these requirements has particularly excellent liquid absorption performance. The Klem water absorption height is an index of liquid retention, and the higher the KREM water absorption height, the higher the liquid retention of the fiber sheet.

クレム吸水高さについて前記大小関係を成立させる観点から、中間シート１３としてはクレープ紙が特に好ましい。第１シート１１及び第２シート１２としてクレープ紙を用いてもよい。クレープ紙は、襞や皺を有する紙である。襞や皺が紙に伸縮性を持たせるので、クレープ紙はこれを伸ばしたときの表面積が一般的な紙よりも大きくなる。クレープ紙の斯かる特性により、クレープ紙からなる中間シート１３等は、クレム吸水高さが比較的高く、それ故に液の引き込み性に優れ、また、吸液状態の剛性が比較的低いものとなる。クレープ紙におけるクレープの程度は、水中伸度法によって測定されたクレープ率で表して、好ましくは５％以上、より好ましくは１０％以上、更に好ましくは１５％以上であり、また、３０％以下が現実的である。 Crepe paper is particularly preferable as the intermediate sheet 13 from the viewpoint of establishing the above-mentioned size relationship regarding crepe water absorption height. Crepe paper may be used as the first sheet 11 and the second sheet 12. Crepe paper is paper that has pleats or wrinkles. The folds and wrinkles give the paper elasticity, so when stretched, crepe paper has a larger surface area than regular paper. Due to such characteristics of crepe paper, the intermediate sheet 13 etc. made of crepe paper has a relatively high Creme water absorption height, therefore has excellent liquid drawing ability, and has relatively low rigidity in the liquid absorption state. . The degree of crepe in the crepe paper is preferably 5% or more, more preferably 10% or more, still more preferably 15% or more, and 30% or less, expressed as a crepe rate measured by an underwater elongation method. Be realistic.

中間シート１３の好ましい一例として、クレープ率が前記の好ましい範囲にあるクレープ紙を例示できる。
一方、第２シート１２は、クレープ率が１％未満であることが好ましい。第２シート１２をこのようなクレープ率とすることによって、第２シート１２のクレム吸水高さを中間シート１３のそれよりも低くすることが可能となり、また、第２シート１２の内部に液を保持させにくくして、通気性を向上させることが可能となる。
第１シート１１のクレープ率は、第２シート１２と同様の範囲でよい。 A preferable example of the intermediate sheet 13 is crepe paper having a crepe rate within the above-mentioned preferable range.
On the other hand, the second sheet 12 preferably has a crepe rate of less than 1%. By setting the second sheet 12 to such a crepe rate, it is possible to make the crepe water absorption height of the second sheet 12 lower than that of the intermediate sheet 13, and also to prevent liquid from entering the inside of the second sheet 12. It is possible to improve air permeability by making it difficult to retain the material.
The crepe rate of the first sheet 11 may be in the same range as that of the second sheet 12.

クレープ率は、例えば以下の方法に基づいて、水中伸度法で測定することができる。測定は２３±２℃、相対湿度５０±５％で行い、測定の前に試料を同環境で２４時間以上保存した上で測定する。測定対象のシートを、皺が延在している方向に２５ｍｍ、及びそれに直交する方向に１００ｍｍのサイズで切断して測定試料を作製し、該測定試料を水中に１分間浸漬した後引き上げ、前記直交する方向への寸法の変化量から次式でクレープ率を算出する。測定は３回行い、その算術平均値をクレープ率（％）とする。前記直交方向において１００ｍｍのサイズを確保できない場合は、前記直交方向において最低３０ｍｍ以上のサイズで切断して、クレープ率を求めることができる。
クレープ率（％）＝｛（水に浸漬した後の寸法（ｍｍ））／（水に浸漬する前の寸法（ｍｍ））－１｝×１００ The crepe rate can be measured by the underwater elongation method, for example, based on the following method. Measurements are performed at 23±2° C. and relative humidity of 50±5%, and samples are stored in the same environment for at least 24 hours before measurement. A measurement sample was prepared by cutting the sheet to be measured into a size of 25 mm in the direction in which the wrinkles extend and 100 mm in the direction perpendicular thereto, and the measurement sample was immersed in water for 1 minute and then pulled out. The crepe rate is calculated from the amount of change in dimension in the orthogonal direction using the following formula. The measurement was performed three times, and the arithmetic mean value was taken as the crepe rate (%). If it is not possible to secure a size of 100 mm in the orthogonal direction, the crepe rate can be determined by cutting to a size of at least 30 mm or more in the orthogonal direction.
Crepe rate (%) = {(Dimensions after immersion in water (mm))/(Dimensions before immersion in water (mm)) -1} x 100

第１シート１１の好ましい一実施形態として、不織布、より好ましくはＳＭＳ不織布を例示できる。
第２シート１２の好ましい一実施形態として、不織布を含んで構成されているものを例示できる。より具体的には、例えば、スパンボンド不織布、ＳＭＳ不織布が挙げられ、特にＳＭＳ不織布が好ましい。
中間シート１３の好ましい一実施形態として、セルロース系繊維を主体とする（セルロース系繊維の含有量が５０質量％以上である）紙を例示できる。 A preferred embodiment of the first sheet 11 is a nonwoven fabric, more preferably an SMS nonwoven fabric.
As a preferred embodiment of the second sheet 12, one that includes a nonwoven fabric can be exemplified. More specifically, examples include spunbond nonwoven fabrics and SMS nonwoven fabrics, with SMS nonwoven fabrics being particularly preferred.
As a preferred embodiment of the intermediate sheet 13, paper mainly composed of cellulose fibers (the content of cellulose fibers is 50% by mass or more) can be exemplified.

第１シート１１の坪量は、好ましくは５ｇ／ｍ２以上、より好ましくは８ｇ／ｍ２以上、そして、好ましくは８０ｇ／ｍ２以下、より好ましくは６０ｇ／ｍ２以下である。
第２シート１２の坪量は、好ましくは５ｇ／ｍ２以上、より好ましくは８ｇ／ｍ２以上、そして、好ましくは８０ｇ／ｍ２以下、より好ましくは６０ｇ／ｍ２以下である。
中間シート１３の坪量は、好ましくは５ｇ／ｍ２以上、より好ましくは８ｇ／ｍ２以上、そして、好ましくは８０ｇ／ｍ２以下、より好ましくは６０ｇ／ｍ２以下である。 The basis weight of the first sheet 11 is preferably 5 g/m 2 or more, more preferably 8 g/m 2 or more, and preferably 80 g/m 2 or less, more preferably 60 g/m 2 or less.
The basis weight of the second sheet 12 is preferably 5 g/m 2 or more, more preferably 8 g/m 2 or more, and preferably 80 g/m 2 or less, more preferably 60 g/m 2 or less.
The basis weight of the intermediate sheet 13 is preferably 5 g/m 2 or more, more preferably 8 g/m 2 or more, and preferably 80 g/m 2 or less, more preferably 60 g/m 2 or less.

第１コア側積層構造、すなわち「第１シート１１、第１コア１４及び中間シート１３からなる積層構造」の坪量は特に制限されないが、吸収容量と薄型化及び柔軟性とのバランスの観点から、好ましくは８０ｇ／ｍ２以上、より好ましくは１００ｇ／ｍ２以上、そして、好ましくは６００ｇ／ｍ２以下、より好ましくは４００ｇ／ｍ２以下である。
同様の観点から、第２コア１５の坪量（後述する貫通孔１５Ｎ以外の部分の坪量）は、好ましくは１００ｇ／ｍ２以上、より好ましくは１５０ｇ／ｍ２以上、そして、好ましくは８００ｇ／ｍ２以下、より好ましくは７００ｇ／ｍ２以下である。 The basis weight of the first core side laminated structure, that is, "the laminated structure consisting of the first sheet 11, the first core 14, and the intermediate sheet 13" is not particularly limited, but from the viewpoint of the balance between absorption capacity, thinning, and flexibility. , preferably 80 g/m 2 or more, more preferably 100 g/m 2 or more, and preferably 600 g/m 2 or less, more preferably 400 g/m 2 or less.
From the same viewpoint, the basis weight of the second core 15 (the basis weight of the portion other than the through hole 15N described later) is preferably 100 g/m 2 or more, more preferably 150 g/m 2 or more, and preferably 800 g/m 2 or more. m 2 or less, more preferably 700 g/m 2 or less.

吸収体１０は、公知の装置を用いて常法に従って製造することができる。吸収体１０の製造装置は、典型的には、第１コア１４を製造する第１製造部と、第２コア１５を製造する第２製造部とを備える。前記第２製造部は、典型的には、前述した積繊装置を備える。前記第１製造部は、典型的には、シートの搬送手段と、該シートに接着剤を塗布する塗布手段と、吸水性ポリマー２０の散布手段とを備える。前記第１製造部では、前記搬送手段で第１シート１１及び中間シート１３の何れか一方を搬送しつつ、その搬送中のシートの一面に前記塗布手段を用いて接着剤を所定のパターンで塗布し、更に、該搬送中のシートにおける該接着剤の塗布領域に、前記散布手段によって吸水性ポリマー２０を散布した後、両シート１１，１３のうちの他方を、一方における吸水性ポリマー２０の散布面に重ね合わせ、該接着剤を介して一体化させ、必要に応じ製品単位長さに切断することで、第１コア１４を製造する。 The absorbent body 10 can be manufactured according to a conventional method using a known device. The manufacturing apparatus for the absorbent body 10 typically includes a first manufacturing section that manufactures the first core 14 and a second manufacturing section that manufactures the second core 15. The second manufacturing section typically includes the above-mentioned fiber stacking device. The first manufacturing section typically includes a sheet conveyance means, an application means for applying an adhesive to the sheet, and a water-absorbing polymer 20 dispersion means. In the first manufacturing department, while the conveyance means conveys either the first sheet 11 or the intermediate sheet 13, the application means coats an adhesive in a predetermined pattern on one side of the sheet being conveyed. Then, after the water-absorbing polymer 20 is sprayed by the spraying means onto the area where the adhesive is applied on the sheet being conveyed, the other of the two sheets 11 and 13 is sprayed with the water-absorbing polymer 20 on one of the sheets. The first core 14 is manufactured by superimposing the first core 14 on its surface, integrating it via the adhesive, and cutting it into product unit lengths as necessary.

吸収体１０の製造装置では、前記第２製造部で製造された第２コア１５を、予め接着剤２１，２５が塗布された第２シート１２の該接着剤塗布面に載置した状態で、第２シート１２とともに搬送しつつ、前記第１製造部で製造された第１コア１４を搬送中の第２コア１５に重ね合わせ、両コア１４，１５の少なくとも一方に予め塗布されていた接着剤２４を介してこれらを一体化させた後、第２シート１２の延出部１２Ｅ（図４参照）を第１コア１４側に巻きかけてこれを被覆し、必要に応じ製品単位長さに切断することで、吸収体１０を製造する。 In the manufacturing apparatus for the absorbent body 10, the second core 15 manufactured in the second manufacturing section is placed on the adhesive-coated surface of the second sheet 12, which has been previously coated with adhesives 21 and 25. While being conveyed together with the second sheet 12, the first core 14 manufactured in the first manufacturing section is superimposed on the second core 15 being conveyed, and an adhesive that has been applied in advance to at least one of both cores 14 and 15 is applied. 24, the extended portion 12E (see FIG. 4) of the second sheet 12 is wrapped around the first core 14 to cover it, and cut into product unit lengths as necessary. By doing so, the absorber 10 is manufactured.

本発明の吸収性物品は、前記実施形態の如き展開型使い捨ておむつに制限されず、人体から排出される体液（尿、経血、軟便、汗等）の吸収に用いられる物品を広く包含し、止着部材８及び止着領域９の如き止着構造を有しないパンツ型の使い捨ておむつ、生理用ナプキン、生理用ショーツ等も包含する。 The absorbent article of the present invention is not limited to the expandable disposable diaper as in the above embodiment, but broadly includes articles used for absorbing body fluids (urine, menstrual blood, soft stool, sweat, etc.) discharged from the human body, It also includes pants-type disposable diapers, sanitary napkins, sanitary shorts, etc. that do not have a fastening structure such as the fastening member 8 and the fastening region 9.

以上、本発明をその好ましい実施形態に基づき説明したが、本発明の吸収性物品は前記実施形態に何ら制限されるものではなく、適宜変更可能である。
例えば、前記実施形態では、第２コア１５と第２シート１２及び中間シート１３との間に他の部材が介在されていないが、第２コア１５と第２シート１２との間及び／又は第２コア１５と中間シート１３との間に、透過性ないし液吸収性の部材が介在されていてもよい。そのような例として、第２コア１５の肌対向面及び／又は非肌対向面が、第２シート１２及び中間シート１３とは別体の液透過性ないし液吸収性シートで被覆された形態が挙げられる。
また、前記実施形態では、第１シート１１、第２シート１２及び中間シート１３は、それぞれ別体で独立した部材であったが、これらのうちの何れか２つで１枚のシートを構成していてもよい。その具体例として、吸収体１０が、第１コア１４の肌対向面（第２コア１５側）及び非肌対向面（第２コア１５側とは反対側）を被覆する１枚のシートを備え、該１枚のシートにおける第１コア１４の非肌対向面を被覆する部分が第１シート１１、該１枚のシートにおける第１コア１４の肌対向面を被覆する部分が中間シート１３である形態が挙げられる。他の具体例として、吸収体１０が、第２コア１５の肌対向面（第１コア１４側とは反対側）及び非肌対向面（第１コア１４側）を被覆する１枚のシートを備え、該１枚のシートにおける第２コア１５の非肌対向面を被覆する部分が中間シート１３、該１枚のシートにおける第２コア１５の肌対向面を被覆する部分が第２シート１２である形態が挙げられる。 Although the present invention has been described above based on its preferred embodiments, the absorbent article of the present invention is not limited to the above embodiments and can be modified as appropriate.
For example, in the embodiment, other members are not interposed between the second core 15 and the second sheet 12 and the intermediate sheet 13; A permeable or liquid-absorbing member may be interposed between the two cores 15 and the intermediate sheet 13. As an example of such a configuration, the skin-facing surface and/or non-skin-facing surface of the second core 15 may be covered with a liquid-permeable or liquid-absorbent sheet that is separate from the second sheet 12 and the intermediate sheet 13. Can be mentioned.
Further, in the embodiment, the first sheet 11, the second sheet 12, and the intermediate sheet 13 were each separate and independent members, but any two of them constitute one sheet. You can leave it there. As a specific example, the absorber 10 includes one sheet that covers the skin-facing surface (the second core 15 side) and the non-skin-facing surface (the side opposite to the second core 15 side) of the first core 14. , the portion of the one sheet that covers the non-skin facing surface of the first core 14 is the first sheet 11, and the portion of the one sheet that covers the skin facing surface of the first core 14 is the intermediate sheet 13. One example is the form. As another specific example, the absorber 10 may include one sheet that covers the skin-facing surface (the side opposite to the first core 14 side) and the non-skin-facing surface (the first core 14 side) of the second core 15. The portion of the one sheet that covers the non-skin facing surface of the second core 15 is the intermediate sheet 13, and the portion of the one sheet that covers the skin facing surface of the second core 15 is the second sheet 12. There is a certain form.

また、貫通孔１５Ｎの平面視形状、数は前記実施形態に制限されず、任意に設定し得る。例えば、平面視長方形形状の１本の貫通孔１５Ｎが、第２コア１５の横方向Ｙの中央において縦方向Ｘに延在していてもよく、あるいは、平面視長方形形状の３本以上の複数の貫通孔１５Ｎが、それらの長手方向を縦方向Ｘに一致させて横方向Ｙに間欠配置されていてもよい。
また、本発明の吸収性物品において、吸収性や防漏性等の向上の観点から、表面シート３と吸収体１０（第２シート１２）との間に、セカンドシート、サブレイヤーシートなどとも呼ばれる、紙や各種不織布からなる液透過性シートが介在配置されていてもよい。
前述した一の実施形態のみが有する部分は、すべて適宜相互に利用できる。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。 Further, the plan view shape and number of the through holes 15N are not limited to those in the embodiment described above, and can be set arbitrarily. For example, one through hole 15N having a rectangular shape in a plan view may extend in the vertical direction X at the center of the second core 15 in the horizontal direction Y, or a plurality of three or more through holes having a rectangular shape in a plan view The through holes 15N may be arranged intermittently in the horizontal direction Y with their longitudinal directions aligned with the vertical direction X.
In addition, in the absorbent article of the present invention, from the viewpoint of improving absorbency and leak-proofing properties, a second sheet, a sublayer sheet, etc., is provided between the top sheet 3 and the absorbent body 10 (second sheet 12). A liquid permeable sheet made of paper or various nonwoven fabrics may be interposed.
All parts that only one of the embodiments described above has can be used mutually as appropriate. Regarding the embodiments of the present invention described above, the following additional notes are further disclosed.

＜１＞
着用者の前後方向に対応する縦方向と該縦方向に直交する横方向とを有し、着用者の股間部に配される股下部と、該股下部よりも着用者の腹側に配される腹側部と、該股下部よりも着用者の背側に配される背側部とを備える吸収性物品に用いられる吸収体であって、
中間シートと、該中間シートの非肌対向面側に配される第１シートと、該中間シートの肌対向面側に配される第２シートとを具備し、該第１シートと該中間シートとの間に、吸水性材料として少なくとも吸水性ポリマーを含有する第１コアが介在配置され、該中間シートと該第２シートとの間に、吸液により膨潤する吸水性の第２コアが介在配置されており、
前記第２コアの前記股下部に対応する領域に、該第２コアを厚み方向に貫通する貫通孔が形成され、該貫通孔と平面視で重なる領域において、前記第２シートと前記中間シートとが、該第２コアにおける該貫通孔の周辺の貫通孔非形成部と平面視で重なる領域よりも近接しており、
前記第１コアの形成材料の９０質量％以上が吸水性ポリマーであり、
前記第１コアの前記股下部に対応する領域において、前記吸水性ポリマーが均一に分布しており、
前記吸収体は、吸液状態において、前記貫通孔と平面視で重なる領域の肌対向面側及び非肌対向面側に凹部を有し、該非肌対向面側の凹部の深さが、該肌対向面側の凹部の深さの４０％以下である、吸収体。
＜２＞
吸液状態の前記吸収体における前記貫通孔と平面視で重なる領域において、前記非肌対向面側の凹部の深さ（最大深さ）が、前記肌対向面側の凹部の深さ（最大深さ）に対して、好ましくは３５％以下、より好ましくは３０％以下である、前記＜１＞に記載の吸収体。
＜３＞
前記貫通孔と平面視で重なる領域の前記非肌対向面側の凹部の深さ（最大深さ）が３ｍｍ未満である、前記＜１＞又は＜２＞に記載の吸収体。
＜４＞
前記貫通孔と平面視で重なる領域の前記非肌対向面側の凹部の深さ（最大深さ）が、好ましくは２．０ｍｍ未満である、前記＜１＞～＜３＞の何れか１項に記載の吸収体。 <1>
It has a vertical direction corresponding to the front and back direction of the wearer and a horizontal direction perpendicular to the longitudinal direction, and has a crotch area located in the wearer's crotch area and a crotch area located on the ventral side of the wearer from the crotch area. An absorbent article for use in an absorbent article comprising: a ventral side portion;
an intermediate sheet, a first sheet disposed on the non-skin facing surface side of the intermediate sheet, and a second sheet disposed on the skin facing surface side of the intermediate sheet, the first sheet and the intermediate sheet A first core containing at least a water-absorbing polymer as a water-absorbing material is interposed between the intermediate sheet and the second sheet, and a water-absorbing second core that swells by liquid absorption is interposed between the intermediate sheet and the second sheet. It is located
A through hole passing through the second core in the thickness direction is formed in a region corresponding to the crotch portion of the second core, and in a region overlapping with the through hole in a plan view, the second sheet and the intermediate sheet is closer than a region of the second core that overlaps the through-hole non-formed portion around the through-hole in a plan view,
90% by mass or more of the material forming the first core is a water-absorbing polymer,
In a region corresponding to the crotch portion of the first core, the water-absorbing polymer is uniformly distributed;
In a liquid absorbing state, the absorbent body has recesses on the skin-facing surface side and the non-skin-facing surface side in a region that overlaps with the through-hole in plan view, and the depth of the recesses on the non-skin-facing surface side is equal to or greater than the skin-facing surface. The absorber has a depth of 40% or less of the recess on the opposing surface side.
<2>
In a region of the absorbent body in a liquid-absorbing state that overlaps with the through-hole in plan view, the depth (maximum depth) of the recess on the non-skin facing surface side is equal to the depth (maximum depth) of the recess on the skin facing surface side. The absorbent according to <1> above, wherein the absorbent content is preferably 35% or less, more preferably 30% or less.
<3>
The absorbent body according to <1> or <2>, wherein the depth (maximum depth) of the recess on the non-skin facing surface side in the region overlapping with the through hole in plan view is less than 3 mm.
<4>
Any one of <1> to <3> above, wherein the depth (maximum depth) of the recess on the non-skin facing surface side in a region overlapping with the through hole in plan view is preferably less than 2.0 mm. Absorber described in.

＜５＞
前記貫通孔と平面視で重なる領域における前記第２シートの肌対向面を基準として、該第２シートにおける前記貫通孔非形成部に対応する部分の肌対向面の該基準からの厚み方向に沿う離間距離をＤ１、前記中間シートにおける該貫通孔非形成部に対応する部分の非肌対向面の該基準からの厚み方向に沿う離間距離をＤ２とした場合、該離間距離Ｄ１の方が、該離間距離Ｄ２に比べて、前記吸収体の吸液に伴う増加の程度が大きい、前記＜１＞～＜４＞の何れか１項に記載の吸収体。
＜６＞
前記吸収体の吸液状態において、前記離間距離Ｄ１（Ｄ１ｂ）の方が、前記離間距離Ｄ２（Ｄ２ｂ）に比べて長い、前記＜５＞に記載の吸収体。
＜７＞
前記離間距離Ｄ１に関して、前記吸収体の吸液前の状態のものをＤ１ａ、該吸収体の吸液状態のものをＤ１ｂとし、前記離間距離Ｄ２に関して、該吸収体の吸液前の状態のものをＤ２ａ、該吸収体の吸液状態のものをＤ２ｂとした場合、離間距離Ｄ２ａと離間距離Ｄ２ｂとの差分（Ｄ２ｂ－Ｄ２ａ）に対する、離間距離Ｄ１ａと離間距離Ｄ１ｂとの差分（Ｄ１ｂ－Ｄ１ａ）の比率が、（Ｄ１ｂ－Ｄ１ａ）＞（Ｄ２ｂ－Ｄ２ａ）を前提として、好ましくは１．１以上、より好ましくは１．２以上である、前記＜５＞又は＜６＞に記載の吸収体。
＜８＞
前記離間距離Ｄ１に関して、前記吸収体の吸液前の状態のものをＤ１ａ、該吸収体の吸液状態のものをＤ１ｂとし、前記離間距離Ｄ２に関して、該吸収体の吸液前の状態のものをＤ２ａ、該吸収体の吸液状態のものをＤ２ｂとした場合、離間距離Ｄ２ａと離間距離Ｄ２ｂとの差分（Ｄ２ｂ－Ｄ２ａ）に対する、離間距離Ｄ１ａと離間距離Ｄ１ｂとの差分（Ｄ１ｂ－Ｄ１ａ）の比率が、（Ｄ１ｂ－Ｄ１ａ）＞（Ｄ２ｂ－Ｄ２ａ）を前提として、好ましくは１０．０以下、より好ましくは５．０以下である、前記＜５＞～＜７＞の何れか１項に記載の吸収体。
＜９＞
前記吸収体の吸液前の状態において、前記離間距離Ｄ１（Ｄ１ａ）は、前記離間距離Ｄ２（Ｄ２ａ）よりも長いことを前提として、好ましくは１．０ｍｍ以上、より好ましくは１．５ｍｍ以上である、前記＜５＞～＜８＞の何れか１項に記載の吸収体。
＜１０＞
前記吸収体の吸液前の状態において、前記離間距離Ｄ１（Ｄ１ａ）は、前記離間距離Ｄ２（Ｄ２ａ）よりも長いことを前提として、好ましくは２０ｍｍ以下、より好ましくは１０ｍｍ以下である、前記＜５＞～＜９＞の何れか１項に記載の吸収体。
＜１１＞
前記吸収体の吸液前の状態において、前記離間距離Ｄ２（Ｄ２ａ）は、前記離間距離Ｄ１（Ｄ１ａ）よりも短いことを前提として、好ましくは０．５ｍｍ以上、より好ましくは１．０ｍｍ以上である、前記＜５＞～＜１０＞の何れか１項に記載の吸収体。
＜１２＞
前記吸収体の吸液前の状態において、前記離間距離Ｄ２（Ｄ２ａ）は、前記離間距離Ｄ１（Ｄ１ａ）よりも短いことを前提として、好ましくは１０ｍｍ以下、より好ましくは５．０ｍｍ以下である、前記＜５＞～＜１１＞の何れか１項に記載の吸収体。 <5>
Based on the skin-facing surface of the second sheet in a region overlapping with the through-hole in plan view, along the thickness direction of the skin-facing surface of the portion of the second sheet corresponding to the non-through-hole portion from the reference. When the separation distance is D1, and the separation distance along the thickness direction from the reference of the non-skin facing surface of the portion of the intermediate sheet corresponding to the non-through-hole formed portion is D2, the separation distance D1 is greater than the non-skin-facing surface of the intermediate sheet. The absorbent body according to any one of <1> to <4>, wherein the degree of increase due to liquid absorption by the absorbent body is greater than the separation distance D2.
<6>
The absorbent body according to <5>, wherein the separation distance D1 (D1b) is longer than the separation distance D2 (D2b) in the liquid absorption state of the absorbent body.
<7>
Regarding the separation distance D1, the state of the absorber before absorbing liquid is D1a, the state of the absorber in a liquid absorbing state is D1b, and regarding the separation distance D2, the state of the absorber before absorbing liquid. is D2a, and the liquid absorption state of the absorber is D2b, then the difference between the separation distance D1a and the separation distance D1b (D1b - D1a) with respect to the difference between the separation distance D2a and the separation distance D2b (D2b - D2a) The absorber according to <5> or <6>, wherein the ratio of (D1b-D1a)>(D2b-D2a) is preferably 1.1 or more, more preferably 1.2 or more.
<8>
Regarding the separation distance D1, the state of the absorber before absorbing liquid is D1a, the state of the absorber in a liquid absorbing state is D1b, and regarding the separation distance D2, the state of the absorber before absorbing liquid. is D2a, and the liquid absorption state of the absorber is D2b, then the difference between the separation distance D1a and the separation distance D1b (D1b - D1a) with respect to the difference between the separation distance D2a and the separation distance D2b (D2b - D2a) In any one of the above items <5> to <7>, the ratio of (D1b-D1a)>(D2b-D2a) is preferably 10.0 or less, more preferably 5.0 or less. Absorber as described.
<9>
In the state before liquid absorption of the absorber, the separation distance D1 (D1a) is preferably 1.0 mm or more, more preferably 1.5 mm or more, on the premise that the separation distance D1 (D1a) is longer than the separation distance D2 (D2a). The absorber according to any one of <5> to <8> above.
<10>
In the state before liquid absorption of the absorber, the separation distance D1 (D1a) is preferably 20 mm or less, more preferably 10 mm or less, on the premise that the separation distance D1 (D1a) is longer than the separation distance D2 (D2a). The absorber according to any one of items 5> to <9>.
<11>
In the state before liquid absorption of the absorber, the separation distance D2 (D2a) is preferably 0.5 mm or more, more preferably 1.0 mm or more, on the premise that the separation distance D2 (D2a) is shorter than the separation distance D1 (D1a). The absorber according to any one of <5> to <10> above.
<12>
In the state before liquid absorption of the absorber, the separation distance D2 (D2a) is preferably 10 mm or less, more preferably 5.0 mm or less, on the premise that it is shorter than the separation distance D1 (D1a). The absorbent body according to any one of <5> to <11>.

＜１３＞
前記吸収体の吸液状態において、前記第１コアの前記貫通孔非形成部に対応する部分に比べて、該第１コアの前記貫通孔に対応する部分の厚みが大きい、前記＜１＞～＜１２＞の何れか１項に記載の吸収体。
＜１４＞
前記第１コアの前記貫通孔非形成部に対応する部分の厚み（Ｔ１）と、該第１コアの前記貫通孔に対応する部分の厚み（Ｔ２）との比率が、前者＜後者を前提として、後者／前者として、好ましくは１．１以上、より好ましくは１．２以上である、前記＜１３＞に記載の吸収体。
＜１５＞
前記第１コアの前記貫通孔非形成部に対応する部分の厚み（Ｔ１）と、該第１コアの前記貫通孔に対応する部分の厚み（Ｔ２）との比率が、前者＜後者を前提として、後者／前者として、好ましくは５．０以下、より好ましくは３．０以下である、前記＜１３＞又は＜１４＞に記載の吸収体。
＜１６＞
前記第１コアの前記貫通孔非形成部に対応する部分の厚み（Ｔ１）が、好ましくは０．５ｍｍ以上、より好ましくは１．０ｍｍ以上である、前記＜１３＞～＜１５＞の何れか１項に記載の吸収体。
＜１７＞
前記第１コアの前記貫通孔非形成部に対応する部分の厚み（Ｔ１）が、好ましくは１０ｍｍ以下、より好ましくは５ｍｍ以下である、前記＜１３＞～＜１６＞の何れか１項に記載の吸収体。
＜１８＞
前記第１コアの前記貫通孔に対応する部分の厚み（Ｔ２）が、好ましくは１.０ｍｍ以上、より好ましくは２.０ｍｍ以上である、前記＜１３＞～＜１７＞の何れか１項に記載の吸収体。
＜１９＞
前記第１コアの前記貫通孔に対応する部分の厚み（Ｔ２）が、好ましくは１５ｍｍ以下、より好ましくは１０ｍｍ以下である、前記＜１３＞～＜１８＞の何れか１項に記載の吸収体。 <13>
<1> to above, wherein the thickness of the portion of the first core corresponding to the through-hole is greater than the portion of the first core corresponding to the non-through-hole formed portion in the liquid absorption state of the absorber; The absorber according to any one of <12>.
<14>
The ratio of the thickness (T1) of the portion of the first core corresponding to the through-hole-free portion and the thickness (T2) of the portion of the first core corresponding to the through-hole is premised on the former < the latter. The absorber according to <13> above, wherein the latter / former ratio is preferably 1.1 or more, more preferably 1.2 or more.
<15>
The ratio of the thickness (T1) of the portion of the first core corresponding to the through-hole-free portion and the thickness (T2) of the portion of the first core corresponding to the through-hole is premised on the former < the latter. The absorber according to <13> or <14>, wherein the latter / former ratio is preferably 5.0 or less, more preferably 3.0 or less.
<16>
Any one of <13> to <15> above, wherein the thickness (T1) of the portion of the first core corresponding to the non-through-hole portion is preferably 0.5 mm or more, more preferably 1.0 mm or more. The absorbent body according to item 1.
<17>
According to any one of <13> to <16>, wherein the thickness (T1) of the portion of the first core corresponding to the non-through-hole portion is preferably 10 mm or less, more preferably 5 mm or less. absorber.
<18>
In any one of <13> to <17> above, the thickness (T2) of the portion of the first core corresponding to the through hole is preferably 1.0 mm or more, more preferably 2.0 mm or more. Absorber as described.
<19>
The absorbent body according to any one of <13> to <18>, wherein the thickness (T2) of the portion of the first core corresponding to the through hole is preferably 15 mm or less, more preferably 10 mm or less. .

＜２０＞
前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の、下記式（１）で算出される吸液前後の厚み変化量あたりの曲げ剛性変化率をＢＲとした場合、少なくとも該第１コアの前記股下部に対応する領域において、前記縦方向、前記横方向並びに該縦方向及び該横方向の双方に交差する斜め方向の三方向の該ＢＲが、それぞれ５．０／ｍｍ以下である、前記＜１＞～＜１９＞の何れか１項に記載の吸収体。
ＢＲ＝（Ｂｗ／Ｂｄ）／Ｔ０ｃ （１）
Ｂｗ：前記積層構造の吸液後の曲げ剛性
Ｂｄ：前記積層構造の吸液前の曲げ剛性
Ｔ０ｃ：下記式（２）で算出される前記積層構造の吸液前後の厚み変化量
Ｔ０ｃ＝Ｔ０ｗ－Ｔ０ｄ （２）
Ｔ０ｗ：前記積層構造の吸液後の４．９ｍＮ／ｃｍ２荷重下での厚み
Ｔ０ｄ：前記積層構造の吸液前の４．９ｍＮ／ｃｍ２荷重下での厚み
＜２１＞
前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の前記三方向それぞれの前記ＢＲが、好ましくは４．８／ｍｍ以下、より好ましくは４．５／ｍｍ以下である、前記＜２０＞に記載の吸収体。
＜２２＞
前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の前記三方向それぞれの前記ＢＲが、好ましくは０．１／ｍｍ以上、より好ましくは０．３／ｍｍ以上である、前記＜２０＞又は＜２１＞に記載の吸収体。
＜２３＞
前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の前記縦方向、前記横方向又は前記斜め方向の吸液後の曲げ剛性Ｂｗが、好ましくは２００ｍＮ・ｃｍ２／ｃｍ以下、より好ましくは１００ｍＮ・ｃｍ２／ｃｍ以下である、前記＜２０＞～＜２２＞の何れか１項に記載の吸収体。
＜２４＞
前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の前記縦方向、前記横方向又は前記斜め方向の吸液後の曲げ剛性Ｂｗが、好ましくは０．３ｍＮ・ｃｍ２／ｃｍ以上、より好ましくは０．５ｍＮ・ｃｍ２／ｃｍ以上である、前記＜２０＞～＜２３＞の何れか１項に記載の吸収体。
＜２５＞
前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の前記縦方向、前記横方向又は前記斜め方向の吸液前の曲げ剛性Ｂｄが、好ましくは１９．６ｍＮ・ｃｍ２／ｃｍ以下、より好ましくは１５ｍＮ・ｃｍ２／ｃｍ以下である、前記＜２０＞～＜２４＞の何れか１項に記載の吸収体。
＜２６＞
前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の前記縦方向、前記横方向又は前記斜め方向の吸液前の曲げ剛性Ｂｄが、好ましくは０．１ｍＮ・ｃｍ２／ｃｍ以上、より好ましくは０．２ｍＮ・ｃｍ２／ｃｍ以上である、前記＜２０＞～＜２５＞の何れか１項に記載の吸収体。
＜２７＞
前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の吸液後の４．９ｍＮ／ｃｍ２（＝０．５ｇｆ／ｃｍ２）荷重下での厚み（最大厚み）Ｔ０ｗが、好ましくは１ｍｍ以上、より好ましくは２ｍｍ以上である、前記＜２０＞～＜２６＞の何れか１項に記載の吸収体。
＜２８＞
前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の吸液後の４．９ｍＮ／ｃｍ２（＝０．５ｇｆ／ｃｍ２）荷重下での厚み（最大厚み）Ｔ０ｗが、好ましくは３０ｍｍ以下、より好ましくは１５ｍｍ以下である、前記＜２０＞～＜２７＞の何れか１項に記載の吸収体。
＜２９＞
前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の吸液前の４．９ｍＮ／ｃｍ２（＝０．５ｇｆ／ｃｍ２）荷重下での厚み（最大厚み）Ｔ０ｄが、好ましくは０．１ｍｍ以上、より好ましくは０．３ｍｍ以上である、前記＜２０＞～＜２８＞の何れか１項に記載の吸収体。
＜３０＞
前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の吸液前の４．９ｍＮ／ｃｍ２（＝０．５ｇｆ／ｃｍ２）荷重下での厚み（最大厚み）Ｔ０ｄが、好ましくは５ｍｍ以下、より好ましくは３ｍｍ以下である、前記＜２０＞～＜２９＞の何れか１項に記載の吸収体。
＜３１＞
前記三方向から任意に選択される二方向どうしの前記Ｂｗの比率が、それぞれ０．８以上１．２以下である、前記＜２０＞～＜３０＞の何れか１項に記載の吸収体。 <20>
The bending rigidity change rate per thickness change before and after liquid absorption, calculated by the following formula (1), of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet. In the case of BR, at least in the region corresponding to the crotch portion of the first core, the BR in three directions: the vertical direction, the horizontal direction, and an oblique direction that intersects both the vertical direction and the horizontal direction, The absorbent body according to any one of <1> to <19> above, each having a particle diameter of 5.0/mm or less.
BR=(B w /B d )/T0 c (1)
B w : Bending rigidity of the laminated structure after liquid absorption B d : Bending rigidity of the laminated structure before liquid absorption T0 c : Amount of change in thickness of the laminated structure before and after liquid absorption calculated by the following formula (2) T0 c = T0 w - T0 d (2)
T0 w : Thickness of the laminated structure after liquid absorption under 4.9 mN/cm 2 loads T0 d : Thickness of the laminated structure before liquid absorption under 4.9 mN/cm 2 loads <21>
The BR in each of the three directions of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet is preferably 4.8/mm or less, more preferably 4.5. /mm or less, the absorbent body according to <20> above.
<22>
The BR in each of the three directions of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet is preferably 0.1/mm or more, more preferably 0.3. /mm or more, the absorbent body according to <20> or <21> above.
<23>
The flexural rigidity Bw of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet in the vertical direction, the horizontal direction, or the diagonal direction after liquid absorption is preferably The absorber according to any one of <20> to <22> above, which has an electrical resistance of 200 mN·cm 2 /cm or less, more preferably 100 mN·cm 2 /cm or less.
<24>
The flexural rigidity Bw of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet in the vertical direction, the horizontal direction, or the diagonal direction after liquid absorption is preferably The absorber according to any one of <20> to <23>, which has an electrical resistance of 0.3 mN·cm 2 /cm or more, more preferably 0.5 mN·cm 2 /cm or more.
<25>
The bending rigidity B d of the laminated structure (first core side laminated structure) including the first sheet, the first core, and the intermediate sheet in the vertical direction, the horizontal direction, or the diagonal direction before liquid absorption is preferably The absorber according to any one of <20> to <24> above, which has an electrical resistance of 19.6 mN·cm 2 /cm or less, more preferably 15 mN·cm 2 /cm or less.
<26>
The bending rigidity B d of the laminated structure (first core side laminated structure) including the first sheet, the first core, and the intermediate sheet in the vertical direction, the horizontal direction, or the diagonal direction before liquid absorption is preferably The absorber according to any one of <20> to <25>, which has an electrical resistance of 0.1 mN·cm 2 /cm or more, more preferably 0.2 mN·cm 2 /cm or more.
<27>
Thickness of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet under a load of 4.9 mN/cm 2 (=0.5 gf/cm 2 ) after liquid absorption The absorbent body according to any one of <20> to <26>, wherein (maximum thickness) T0 w is preferably 1 mm or more, more preferably 2 mm or more.
<28>
Thickness of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet under a load of 4.9 mN/cm 2 (=0.5 gf/cm 2 ) after liquid absorption The absorbent body according to any one of <20> to <27>, wherein (maximum thickness) T0 w is preferably 30 mm or less, more preferably 15 mm or less.
<29>
Thickness of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet under a load of 4.9 mN/cm 2 (=0.5 gf/cm 2 ) before liquid absorption The absorbent body according to any one of <20> to <28>, wherein (maximum thickness) T0 d is preferably 0.1 mm or more, more preferably 0.3 mm or more.
<30>
Thickness of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet under a load of 4.9 mN/cm 2 (=0.5 gf/cm 2 ) before liquid absorption The absorbent body according to any one of <20> to <29>, wherein (maximum thickness) T0 d is preferably 5 mm or less, more preferably 3 mm or less.
<31>
The absorbent body according to any one of <20> to <30>, wherein the ratio of the B w in two directions arbitrarily selected from the three directions is 0.8 or more and 1.2 or less, respectively. .

＜３２＞
前記吸収体の吸液状態において、前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の圧縮変形率が、前記第２シート、前記第２コア及び該中間シートからなる積層構造（第２コア側積層構造）の圧縮変形率に比べて大きい、前記＜１＞～＜３１＞の何れか１項に記載の吸収体。
＜３３＞
前記吸収体の吸液状態において、前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の圧縮変形率と、前記第２シート、前記第２コア及び該中間シートからなる積層構造（第２コア側積層構造）の圧縮変形率との比率が、前者＞後者を前提として、前者／後者として、好ましくは２．０以上、より好ましくは２．３以上である、前記＜３２＞に記載の吸収体。
＜３４＞
前記吸収体の吸液状態において、前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の圧縮変形率と、前記第２シート、前記第２コア及び該中間シートからなる積層構造（第２コア側積層構造）の圧縮変形率との比率が、前者＞後者を前提として、前者／後者として、好ましくは１０．０以下、より好ましくは５．０以下である、前記＜３２＞又は＜３３＞に記載の吸収体。
＜３５＞
前記吸収体の吸液状態において、前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の圧縮変形率は、前記第２シート、前記第２コア及び該中間シートからなる積層構造（第２コア側積層構造）の圧縮変形率に比べて大きいことを前提として、好ましくは４０％以上、より好ましくは４５％以上である、前記＜３２＞～＜３４＞の何れか１項に記載の吸収体。
＜３６＞
前記吸収体の吸液状態において、前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の圧縮変形率は、前記第２シート、前記第２コア及び該中間シートからなる積層構造（第２コア側積層構造）の圧縮変形率に比べて大きいことを前提として、好ましくは８０％以下、より好ましくは７５％以下である、前記＜３２＞～＜３５＞の何れか１項に記載の吸収体。
＜３７＞
前記吸収体の吸液状態において、前記第２シート、前記第２コア及び該中間シートからなる積層構造（第２コア側積層構造）の圧縮変形率は、前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の圧縮変形率に比べて小さいことを前提として、好ましくは１０％以上、より好ましくは１５％以上である、前記＜３２＞～＜３６＞の何れか１項に記載の吸収体。
＜３８＞
前記吸収体の吸液状態において、前記第２シート、前記第２コア及び該中間シートからなる積層構造（第２コア側積層構造）の圧縮変形率は、前記第１シート、前記第１コア及び前記中間シートからなる積層構造（第１コア側積層構造）の圧縮変形率に比べて小さいことを前提として、好ましくは６０％以下、より好ましくは５５％以下である、前記＜３２＞～＜３７＞の何れか１項に記載の吸収体。 <32>
In the liquid absorbing state of the absorbent body, the compressive deformation rate of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet is the same as that of the second sheet, the second core, and the intermediate sheet. The absorbent body according to any one of <1> to <31>, which has a higher compressive deformation rate than the laminate structure (second core side laminate structure) made of the intermediate sheet.
<33>
In the liquid absorption state of the absorber, the compressive deformation rate of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet, the second sheet, the second core, and The ratio of the compressive deformation rate of the laminated structure made of the intermediate sheet (second core side laminated structure) is preferably 2.0 or more, more preferably 2.3 or more as the former/latter, assuming that the former > the latter. The absorber according to <32> above.
<34>
In the liquid absorption state of the absorber, the compressive deformation rate of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet, the second sheet, the second core, and The ratio of the compressive deformation rate of the laminated structure made of the intermediate sheet (second core side laminated structure) is preferably 10.0 or less, more preferably 5.0 or less as former/latter, assuming that the former > the latter. The absorbent body according to <32> or <33> above.
<35>
In the liquid absorption state of the absorber, the compressive deformation rate of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet is the same as that of the second sheet, the second core, and the intermediate sheet. <32> to <34 above, which is preferably 40% or more, more preferably 45% or more, assuming that the compressive deformation rate is larger than the compressive deformation rate of the laminated structure (second core side laminated structure) consisting of the intermediate sheet. ＞The absorber according to any one of ＞.
<36>
In the liquid absorption state of the absorber, the compressive deformation rate of the laminated structure (first core side laminated structure) consisting of the first sheet, the first core, and the intermediate sheet is the same as that of the second sheet, the second core, and the intermediate sheet. <32> to <35 above, which is preferably 80% or less, more preferably 75% or less, assuming that the compressive deformation rate is larger than the compressive deformation rate of the laminated structure (second core side laminated structure) consisting of the intermediate sheet. ＞The absorber according to any one of ＞.
<37>
In the liquid absorbing state of the absorbent body, the compressive deformation rate of the laminated structure (second core side laminated structure) consisting of the second sheet, the second core, and the intermediate sheet is the same as that of the first sheet, the first core, and the intermediate sheet. <32> to <36 above, which is preferably 10% or more, more preferably 15% or more, assuming that the compressive deformation rate is smaller than the compressive deformation rate of the laminated structure (first core side laminated structure) consisting of the intermediate sheet. ＞The absorber according to any one of ＞.
<38>
In the liquid absorbing state of the absorbent body, the compressive deformation rate of the laminated structure (second core side laminated structure) consisting of the second sheet, the second core, and the intermediate sheet is the same as that of the first sheet, the first core, and the intermediate sheet. <32> to <37 above, which is preferably 60% or less, more preferably 55% or less, assuming that the compressive deformation rate is smaller than the compressive deformation rate of the laminate structure (first core side laminate structure) consisting of the intermediate sheet. ＞The absorber according to any one of ＞.

＜３９＞
前記第２コアの肌対向面及び非肌対向面に接着剤（２４，２５）が塗布されており、該第２コアの非肌対向面側の接着剤（２４）の方が、該第２コアの肌対向面側の接着剤（２５）に比べて、単位面積当たりの塗布量が多い、前記＜１＞～＜３８＞の何れか１項に記載の吸収体。
＜４０＞
前記第２コアの非肌対向面側の接着剤（２４）の坪量と該第２コアの肌対向面側の接着剤（２５）の坪量との比率が、前者＞後者を前提として、前者／後者として、好ましくは１．１以上、より好ましくは１．３以上である、前記＜３９＞に記載の吸収体。
＜４１＞
前記第２コアの非肌対向面側の接着剤（２４）の坪量と該第２コアの肌対向面側の接着剤（２５）の坪量との比率が、前者＞後者を前提として、前者／後者として、好ましくは１５以下、より好ましくは１０以下である、前記＜３９＞又は＜４０＞に記載の吸収体。＜４２＞
前記第２コアの非肌対向面側の接着剤（２４）の坪量が、好ましくは３．０ｇ／ｍ２以上、より好ましくは４．５ｇ／ｍ２以上である、前記＜３９＞～＜４１＞の何れか１項に記載の吸収体。
＜４３＞
前記第２コアの非肌対向面側の接着剤（２４）の坪量が、好ましくは４０ｇ／ｍ２以下、より好ましくは２０ｇ／ｍ２以下である、前記＜３９＞～＜４２＞の何れか１項に記載の吸収体。
＜４４＞
前記第２コアの肌対向面側の接着剤（２５）の坪量が、好ましくは１．３ｇ／ｍ２以上、より好ましくは１．５ｇ／ｍ２以上である、前記＜３９＞～＜４３＞の何れか１項に記載の吸収体。
＜４５＞
前記第２コアの肌対向面側の接着剤（２５）の坪量が、好ましくは３５ｇ／ｍ２以下、より好ましくは１５ｇ／ｍ２以下である、前記＜３９＞～＜４４＞の何れか１項に記載の吸収体。 <39>
Adhesives (24, 25) are applied to the skin-facing surface and the non-skin-facing surface of the second core, and the adhesive (24) on the non-skin-facing surface of the second core is stronger than the adhesive (24) on the non-skin-facing surface of the second core. The absorbent body according to any one of <1> to <38>, wherein the amount of application per unit area is larger than that of the adhesive (25) on the skin-facing surface of the two cores.
<40>
On the premise that the ratio of the basis weight of the adhesive (24) on the non-skin facing surface side of the second core and the basis weight of the adhesive (25) on the skin facing surface side of the second core is the former > the latter, The absorber according to <39> above, wherein the former/latter ratio is preferably 1.1 or more, more preferably 1.3 or more.
<41>
On the premise that the ratio of the basis weight of the adhesive (24) on the non-skin facing surface side of the second core and the basis weight of the adhesive (25) on the skin facing surface side of the second core is the former > the latter, The absorber according to <39> or <40>, wherein the former/latter ratio is preferably 15 or less, more preferably 10 or less. <42>
The basis weight of the adhesive (24) on the non-skin facing surface of the second core is preferably 3.0 g/m 2 or more, more preferably 4.5 g/m 2 or more, <39> to <41>.
<43>
Any of <39> to <42> above, wherein the basis weight of the adhesive (24) on the non-skin facing surface of the second core is preferably 40 g/m 2 or less, more preferably 20 g/m 2 or less. The absorbent body according to item 1.
<44>
<39> to <43>, wherein the basis weight of the adhesive (25) on the skin-facing side of the second core is preferably 1.3 g/m 2 or more, more preferably 1.5 g/m 2 or more. ＞The absorber according to any one of ＞.
<45>
Any one of <39> to <44> above, wherein the basis weight of the adhesive (25) on the skin-facing surface of the second core is preferably 35 g/m 2 or less, more preferably 15 g/m 2 or less. The absorbent body according to item 1.

＜４６＞
前記貫通孔と平面視で重なる領域において、前記第２シートと前記中間シートとが接合されているとともに、該中間シートと前記第１シートとが接合されている、前記＜１＞～＜４５＞の何れか１項に記載の吸収体。
＜４７＞
前記貫通孔と平面視で重なる領域の好ましくは１０％以上、より好ましくは２０％以上において、前記第２シートと前記中間シートとが接合されている、前記＜４６＞に記載の吸収体。
＜４８＞
前記貫通孔と平面視で重なる領域の好ましくは１０％以上、より好ましくは３０％以上において、前記中間シートと前記第１シートとが接合されている、前記＜４６＞又は＜４７＞に記載の吸収体。 <46>
The above <1> to <45>, wherein the second sheet and the intermediate sheet are joined together, and the intermediate sheet and the first sheet are joined in a region overlapping with the through hole in a plan view. The absorber according to any one of the above.
<47>
The absorbent body according to <46>, wherein the second sheet and the intermediate sheet are joined in preferably 10% or more, more preferably 20% or more of the area that overlaps with the through hole in plan view.
<48>
The method according to <46> or <47>, wherein the intermediate sheet and the first sheet are joined in preferably 10% or more, more preferably 30% or more of the area that overlaps with the through hole in plan view. Absorber.

＜４９＞
前記第１コアの吸水性ポリマー占有率、すなわち該第１コアの形成材料の総質量に対する吸水性ポリマーの含有質量の比率が、好ましくは９２質量％以上、より好ましくは９５質量％以上である、前記＜１＞～＜４８＞の何れか１項に記載の吸収体。
＜５０＞
前記第２コアの吸水性ポリマー占有率、すなわち該第２コアの形成材料の総質量に対する吸水性ポリマーの含有質量の比率が、好ましくは３０質量％以上、より好ましくは４０質量％以上である、前記＜１＞～＜４９＞の何れか１項に記載の吸収体。
＜５１＞
前記第２コアの吸水性ポリマー占有率、すなわち該第２コアの形成材料の総質量に対する吸水性ポリマーの含有質量の比率が、好ましくは９０質量％以下、より好ましくは８０質量％以下である、前記＜１＞～＜５０＞の何れか１項に記載の吸収体。
＜５２＞
前記第２コアにおける吸水性繊維の含有量が、好ましくは２０質量％以上、より好ましくは３０質量％以上である、前記＜１＞～＜５１＞の何れか１項に記載の吸収体。
＜５３＞
前記第２コアにおける吸水性繊維の含有量が、好ましくは９０質量％以下、より好ましくは８０質量％以下である、前記＜１＞～＜５２＞の何れか１項に記載の吸収体。 <49>
The water-absorbing polymer occupancy of the first core, that is, the ratio of the content mass of the water-absorbing polymer to the total mass of the material forming the first core, is preferably 92% by mass or more, more preferably 95% by mass or more. The absorbent body according to any one of <1> to <48>.
<50>
The water-absorbing polymer occupancy of the second core, that is, the ratio of the content mass of the water-absorbing polymer to the total mass of the material forming the second core, is preferably 30% by mass or more, more preferably 40% by mass or more. The absorbent body according to any one of <1> to <49>.
<51>
The water-absorbing polymer occupancy of the second core, that is, the ratio of the content mass of the water-absorbing polymer to the total mass of the material forming the second core, is preferably 90% by mass or less, more preferably 80% by mass or less, The absorbent body according to any one of <1> to <50>.
<52>
The absorbent body according to any one of <1> to <51>, wherein the content of water-absorbing fibers in the second core is preferably 20% by mass or more, more preferably 30% by mass or more.
<53>
The absorbent body according to any one of <1> to <52>, wherein the content of water-absorbing fibers in the second core is preferably 90% by mass or less, more preferably 80% by mass or less.

＜５４＞
前記貫通孔の前記縦方向の長さが、前記第２コアの該縦方向の長さに対して、好ましくは２０％以上、より好ましくは３０％以上である、前記＜１＞～＜５３＞の何れか１項に記載の吸収体。
＜５５＞
前記貫通孔の前記縦方向の長さが、前記第２コアの該縦方向の長さに対して、好ましくは９５％以下、より好ましくは８５％以下である、前記＜１＞～＜５４＞の何れか１項に記載の吸収体。
＜５６＞
前記貫通孔の前記横方向の長さ（幅）が、好ましくは１ｍｍ以上、より好ましくは２ｍｍ以上である、前記＜１＞～＜５５＞の何れか１項に記載の吸収体。
＜５７＞
前記貫通孔の前記横方向の長さ（幅）が、好ましくは２５ｍｍ以下、より好ましくは２０ｍｍ以下である、前記＜１＞～＜５６＞の何れか１項に記載の吸収体。
＜５８＞
前記貫通孔が前記横方向に複数間欠配置されており、該横方向に隣り合う２個の貫通孔どうしの間隔が、好ましくは１０ｍｍ以上、より好ましくは１５ｍｍ以上である、前記＜１＞～＜５７＞の何れか１項に記載の吸収体。
＜５９＞
前記貫通孔が前記横方向に複数間欠配置されており、該横方向に隣り合う２個の貫通孔どうしの間隔が、好ましくは８０ｍｍ以下、より好ましくは６０ｍｍ以下である、前記＜１＞～＜５８＞の何れか１項に記載の吸収体。
＜６０＞
前記第１コアは、前記第２コアに比べて、吸水性ポリマーの坪量（単位面積当たりの質量）が小さい、前記＜１＞～＜５９＞の何れか１項に記載の吸収体。
＜６１＞
前記第１コアの吸水性ポリマーの坪量と前記第２コアの吸水性ポリマーの坪量との比率が、前者＜後者を前提として、後者／前者として、好ましくは１．１以上、より好ましくは１．３以上である、前記＜１＞～＜６０＞の何れか１項に記載の吸収体。
＜６２＞
前記第１コアの吸水性ポリマーの坪量と前記第２コアの吸水性ポリマーの坪量との比率が、前者＜後者を前提として、後者／前者として、好ましくは１０以下、より好ましくは５．０以下である、前記＜１＞～＜６１＞の何れか１項に記載の吸収体。
＜６３＞
前記第２コアは、前記縦方向の中央を同方向に跨いで延在し、且つ該第２コアにおける該縦方向（前記吸収体の長手方向）の一方側に位置する部分の方が、該第２コアにおける該縦方向（該吸収体の長手方向）の他方側に位置する部分に比べて、吸水性材料（コア形成材料）が多い、前記＜１＞～＜６２＞の何れか１項に記載の吸収体。 <54>
<1> to <53> above, wherein the length of the through hole in the vertical direction is preferably 20% or more, more preferably 30% or more of the length of the second core in the vertical direction. The absorber according to any one of the above.
<55>
<1> to <54>, wherein the length of the through hole in the vertical direction is preferably 95% or less, more preferably 85% or less of the length of the second core in the vertical direction. The absorber according to any one of the above.
<56>
The absorbent body according to any one of <1> to <55>, wherein the length (width) of the through hole in the lateral direction is preferably 1 mm or more, more preferably 2 mm or more.
<57>
The absorbent body according to any one of <1> to <56>, wherein the length (width) of the through hole in the lateral direction is preferably 25 mm or less, more preferably 20 mm or less.
<58>
<1> to <<1>, wherein a plurality of the through holes are arranged intermittently in the lateral direction, and the interval between two adjacent through holes in the lateral direction is preferably 10 mm or more, more preferably 15 mm or more. 57>.
<59>
<1> to <<1>, wherein a plurality of the through holes are arranged intermittently in the lateral direction, and the interval between two adjacent through holes in the lateral direction is preferably 80 mm or less, more preferably 60 mm or less. 58>.
<60>
The absorbent body according to any one of <1> to <59>, wherein the first core has a lower basis weight (mass per unit area) of the water-absorbing polymer than the second core.
<61>
The ratio of the basis weight of the water-absorbing polymer of the first core to the basis weight of the water-absorbing polymer of the second core is preferably 1.1 or more, more preferably 1.1 or more as the latter/former, assuming that the former < the latter. The absorbent body according to any one of <1> to <60>, which has a molecular weight of 1.3 or more.
<62>
The ratio of the basis weight of the water-absorbing polymer of the first core to the basis weight of the water-absorbing polymer of the second core is preferably 10 or less, more preferably 5. 0 or less, the absorbent body according to any one of <1> to <61> above.
<63>
The second core extends across the center in the vertical direction in the same direction, and a portion of the second core located on one side in the vertical direction (the longitudinal direction of the absorbent body) is longer than the second core. Any one of the items <1> to <62> above, wherein the second core contains more water-absorbing material (core forming material) than the portion located on the other side in the longitudinal direction (longitudinal direction of the absorbent body). Absorber described in.

＜６４＞
ＪＩＳ Ｐ８１４１に準じて測定されるクレム吸水高さに関し、「前記第１シート≦前記第２シート＜前記中間シート」の大小関係が成立し、且つ該中間シートの該クレム吸水高さが２０ｍｍ以上である、前記＜１＞～＜６３＞の何れか１項に記載の吸収体。
＜６５＞
前記中間シートは、クレープ率が５％以上の紙であり、前記第２シートは、クレープ率が１％未満である、前記＜１＞～＜６４＞の何れか１項に記載の吸収体。
＜６６＞
前記第２シートが不織布を含んで構成されている、前記＜１＞～＜６５＞の何れか１項に記載の吸収体。
＜６７＞
前記＜１＞～＜６６＞の何れか１項に記載の吸収体を備えた吸収性物品。 <64>
Regarding the Klemm water absorption height measured according to JIS P8141, the size relationship of "the first sheet ≦ the second sheet < the intermediate sheet" is established, and the Klemm water absorption height of the intermediate sheet is 20 mm or more. The absorbent body according to any one of the above items <1> to <63>.
<65>
The absorbent body according to any one of <1> to <64>, wherein the intermediate sheet is paper with a crepe rate of 5% or more, and the second sheet has a crepe rate of less than 1%.
<66>
The absorbent body according to any one of <1> to <65>, wherein the second sheet includes a nonwoven fabric.
<67>
An absorbent article comprising the absorbent body according to any one of <1> to <66>.

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。 EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to examples, but the present invention is not limited to these examples.

〔実施例１～２及び比較例１～２〕
図１に示すおむつ１と基本構成が同様の展開型使い捨ておむつを常法に従って作製した。作製した使い捨ておむつの吸収性本体は、着用者の肌から近い順に、表面シート、吸収体及び裏面シートを具備するものであった。前記表面シートとして、坪量２５ｇ／ｍ２の親水性のエアスルー不織布を用いた。前記裏面シートとして、肌対向面側が坪量１８ｇ／ｍ２のポリエチレン樹脂フィルムからなり、非肌対向面側が坪量２５ｇ／ｍ２の疎水性のエアスルー不織布からなる、樹脂フィルムと不織布との積層体を用いた。前記吸収体としては、前述した吸収体１０と同様の構成のものを用いた。第１シートとして、坪量１０ｇ／ｍ２のＳＭＳ不織布を用い、第２シートとして、坪量１０ｇ／ｍ２のＳＭＳ不織布を用い、中間シートとして、坪量１６ｇ／ｍ２のティッシュ（この種の吸収性物品において吸収性コアを包む台紙として使用されているものと同様のもの）を用いた。
第１コアの製造時において、吸水性ポリマーの散布方法（単位時間当たりの散布量、散布パターン等）を適宜変更することで、吸水性ポリマーの分布状態が互いに異なる３種類の第１コア（図７参照）を製造した。３種類の第１コアの吸水性ポリマー占有率は何れも１００％であった。
第２コアとしては、吸水性繊維（針葉樹晒クラフトパルプ；ＮＢＫＰ）及び吸水性ポリマーを含有する積繊体からなり、コア形成材料の坪量が互いに異なる２種類の第２コアを用いた。各第２コアにおいては、貫通孔と平面視で重なる領域において、第２シートと中間シートとを接合した。
前記３種類の第１コアの何れか１つと前記３種類の第２コアの何れか１つとを用いて、第１コアにおける吸水性ポリマーの分布状態が互いに異なる複数の展開型使い捨ておむつを作製し、実施例又は比較例とした。 [Examples 1-2 and Comparative Examples 1-2]
A deployable disposable diaper having the same basic structure as the diaper 1 shown in FIG. 1 was produced according to a conventional method. The absorbent body of the produced disposable diaper included a top sheet, an absorbent body, and a back sheet in the order closest to the wearer's skin. As the top sheet, a hydrophilic air-through nonwoven fabric with a basis weight of 25 g/m 2 was used. The back sheet is a laminate of a resin film and a nonwoven fabric, in which the skin-facing side is made of a polyethylene resin film with a basis weight of 18 g/m 2 and the non-skin-facing side is made of a hydrophobic air-through nonwoven fabric with a basis weight of 25 g/m 2 . was used. As the absorbent body, one having the same structure as the absorbent body 10 described above was used. As the first sheet, an SMS nonwoven fabric with a basis weight of 10 g/m 2 is used, as the second sheet an SMS nonwoven fabric with a basis weight of 10 g/m 2 is used, and as an intermediate sheet, a tissue with a basis weight of 16 g/m 2 (this kind of A paper similar to that used as a mount for wrapping an absorbent core in absorbent articles was used.
By appropriately changing the method of dispersing the water-absorbing polymer (spraying amount per unit time, dispersion pattern, etc.) during the production of the first core, three types of first cores with different distribution states of the water-absorbing polymer (Fig. 7) was manufactured. The water-absorbing polymer occupancy of the three types of first cores was all 100%.
As the second core, two types of second cores were used, which were made of a fiber stack containing water-absorbing fibers (softwood bleached kraft pulp; NBKP) and a water-absorbing polymer, and the basis weights of the core forming materials were different from each other. In each second core, the second sheet and the intermediate sheet were joined in a region that overlapped with the through hole in plan view.
Using any one of the three types of first cores and any one of the three types of second cores, a plurality of expandable disposable diapers in which the distribution state of the water-absorbing polymer in the first core is different from each other is produced. , Examples or Comparative Examples.

〔比較例３〕
吸収体として、第１コアを具備せずに第２コアのみを具備するものを用いた点以外は、実施例２と同様に展開型使い捨ておむつを作製した。 [Comparative example 3]
A deployable disposable diaper was produced in the same manner as in Example 2, except that an absorbent body having only a second core without having a first core was used.

図７には、実施例１～２及び比較例１～２における第１コア側積層構造（第１シート１１、第１コア１４及び中間シート１３からなる積層構造）の概略構成が示されている。なお図７では、理解容易の観点から、第１コア１４（吸水性ポリマー２０）を覆う一方のシート（第１シート１１又は中間シート１３）の記載を省略している。 FIG. 7 shows a schematic configuration of the first core side laminated structure (the laminated structure consisting of the first sheet 11, the first core 14, and the intermediate sheet 13) in Examples 1 and 2 and Comparative Examples 1 and 2. . Note that in FIG. 7, from the viewpoint of easy understanding, one sheet (the first sheet 11 or the intermediate sheet 13) that covers the first core 14 (water-absorbing polymer 20) is omitted.

実施例１，２共通の第１コア側積層構造１７Ａでは、図７（ａ）に示すように、互いに同形状同寸法の平面視長方形形状の第１シート１１及び中間シート１３それぞれの周縁部を除く全域に、吸水性ポリマー２０が均一にほぼ隙間なく散布されることで、両シート１１，１３間に第１コア１４が形成されている。第１コア側積層構造１７Ａにおいて、第１コア１４における吸水性ポリマー２０の坪量１１０ｇ／ｍ２、第１コア１４の横方向Ｙの長さＬ１は１１０ｍｍであった。 In the first core-side laminated structure 17A common to Examples 1 and 2, as shown in FIG. The first core 14 is formed between the sheets 11 and 13 by uniformly dispersing the water-absorbing polymer 20 over the entire area with almost no gaps. In the first core-side laminated structure 17A, the basis weight of the water-absorbing polymer 20 in the first core 14 was 110 g/m 2 , and the length L1 in the lateral direction Y of the first core 14 was 110 mm.

比較例１の第１コア側積層構造１７Ｂでは、図７（ｂ）に示すように、互いに同形状同寸法の平面視長方形形状の第１シート１１及び中間シート１３それぞれの周縁部を除く全域に、吸水性ポリマー２０が所定のパターンで間欠的に散布されることで、両シート１１，１３間に第１コア１４が形成されている。第１コア側積層構造１７Ｂにおける吸水性ポリマー２０の散布パターンは、具体的には、平面視で正六角形を隙間なく並べたいわゆるハニカム状であり、吸水性ポリマー２０は各正六角形に沿って配置されている。第１コア側積層構造１７Ｂにおいて、第１コア１４における吸水性ポリマー２０の坪量１００ｇ／ｍ２、第１コア１４の横方向Ｙの長さＬ１は１１０ｍｍであった。また、図７（ｂ）中符号Ｌ１０で示す長さ（正六角形の一辺の長さ）は８ｍｍであった。 In the first core-side laminated structure 17B of Comparative Example 1, as shown in FIG. 7(b), the first sheet 11 and the intermediate sheet 13, which are rectangular in plan view and have the same shape and size, are coated over the entire area except for the peripheral edges. A first core 14 is formed between both sheets 11 and 13 by intermittently dispersing the water-absorbing polymer 20 in a predetermined pattern. Specifically, the dispersion pattern of the water-absorbing polymer 20 in the first core-side laminated structure 17B is a so-called honeycomb shape in which regular hexagons are arranged without any gaps in a plan view, and the water-absorbing polymer 20 is arranged along each regular hexagon. has been done. In the first core-side laminated structure 17B, the basis weight of the water-absorbing polymer 20 in the first core 14 was 100 g/m 2 , and the length L1 in the lateral direction Y of the first core 14 was 110 mm. Further, the length (the length of one side of the regular hexagon) indicated by the symbol L10 in FIG. 7(b) was 8 mm.

比較例２の第１コア側積層構造１７Ｃでは、図７（ｃ）に示すように、両シート１１，１３の縦方向Ｘの中央部に、縦方向Ｘに延びる一対の吸水性ポリマー２０の非散布領域２０Ｎ，２０Ｎが形成されている。一対の非散布領域２０Ｎ，２０Ｎは、それぞれ平面視において、他方の非散布領域２０Ｎに向かって凸の凸状をなし、且つその凸の頂部が、該非散布領域２０Ｎの長手方向（縦方向Ｘ）の中央部に位置している。第１コア側積層構造１７Ｃにおいて、第１コア１４（非散布領域２０Ｎを除く）における吸水性ポリマー２０の坪量３００ｇ／ｍ２、第１コア１４の横方向Ｙの長さＬ１は１１０ｍｍであった。また、図７（ｃ）中符号Ｌ２ないしＬ６で示す長さは、Ｌ２（非散布領域２０Ｎの縦方向Ｘの長さ）が２００ｍｍ、Ｌ３（非散布領域２０Ｎの幅方向の長さ）が１０ｍｍ、Ｌ４（一対の非散布領域２０Ｎ，２０Ｎ間の最短離間距離）が２０ｍｍ、Ｌ５（第１コア１４の縦方向Ｘに沿う側縁と該側縁に近接する非散布領域２０Ｎとの横方向Ｙにおける最大離間距離）が３５ｍｍ、Ｌ６（一対の非散布領域２０Ｎ，２０Ｎ間の最長離間距離）が５０ｍｍであった。 In the first core-side laminated structure 17C of Comparative Example 2, as shown in FIG. 7(c), a pair of water-absorbing polymers 20 extending in the longitudinal direction Spreading regions 20N, 20N are formed. The pair of non-spreading areas 20N, 20N each have a convex shape toward the other non-spreading area 20N in plan view, and the top of the convexity extends in the longitudinal direction (vertical direction X) of the non-spreading area 20N. It is located in the center of. In the first core side laminated structure 17C, the basis weight of the water-absorbing polymer 20 in the first core 14 (excluding the non-dispersed area 20N) is 300 g/m 2 , and the length L1 in the lateral direction Y of the first core 14 is 110 mm. Ta. In addition, the lengths indicated by symbols L2 to L6 in FIG. 7(c) are 200 mm for L2 (the length in the vertical direction X of the non-sprayed area 20N) and 10 mm for L3 (the length in the width direction of the non-sprayed area 20N). , L4 (the shortest distance between the pair of non-spread areas 20N, 20N) is 20 mm, and L5 (the horizontal direction Y between the side edge of the first core 14 along the longitudinal direction X and the non-spread area 20N adjacent to the side edge) L6 (maximum separation distance between a pair of non-sprayed regions 20N, 20N) was 35 mm, and 50 mm.

実施例及び比較例の使い捨ておむつにおける吸収体について、前記方法により、吸収体の吸液状態における第１コア側積層構造（第１シート、第１コア及び中間シートからなる積層構造）及び第２コア側積層構造（第２シート、第２コア及び中間シートからなる積層構造）それぞれの圧縮変形率、凹部Ｃ１，Ｃ２の深さＣ１Ｄ，Ｃ２Ｄ、並びに厚みＴ１，Ｔ２をそれぞれ測定した。
また、実施例及び比較例の使い捨ておむつにおける吸収体について、下記方法により、第１コア側積層構造の縦方向Ｘ、横方向Ｙ及び斜め方向Ｄそれぞれの吸液前の曲げ剛性Ｂｄ及び吸液後の曲げ剛性Ｂｗ並びに吸液前後の厚み変化量Ｔ０ｃ（＝Ｔ０ｗ－Ｔ０ｄ）をそれぞれ測定し、前記式（１）よりＢＲを算出した。
また、実施例及び比較例の使い捨ておむつにおける吸収性本体について、下記方法により、吸液後凹凸視認性及び吸液後柔軟性を評価した。
また、実施例及び比較例の使い捨ておむつにおける吸収体について、下記方法により液吸収性を評価した。
以上の結果を下記表１及び表２に示す。 Regarding the absorbent bodies in the disposable diapers of Examples and Comparative Examples, the first core-side laminated structure (laminated structure consisting of the first sheet, the first core, and the intermediate sheet) and the second core in the liquid-absorbing state of the absorbent body were obtained by the method described above. The compressive deformation rate, the depths C1D and C2D of the recesses C1 and C2, and the thicknesses T1 and T2 of each side laminated structure (a laminated structure consisting of a second sheet, a second core, and an intermediate sheet) were measured.
In addition, for the absorbers in the disposable diapers of Examples and Comparative Examples, the bending rigidity B d of the first core side laminated structure before liquid absorption in the longitudinal direction X, the lateral direction Y, and the diagonal direction D, and liquid absorption The subsequent bending stiffness B w and the amount of change in thickness T0 c (=T0 w − T0 d ) before and after liquid absorption were measured, and BR was calculated from the above formula (1).
In addition, regarding the absorbent bodies in the disposable diapers of Examples and Comparative Examples, visibility of irregularities after liquid absorption and flexibility after liquid absorption were evaluated by the following method.
In addition, the liquid absorbency of the absorbers in the disposable diapers of Examples and Comparative Examples was evaluated by the following method.
The above results are shown in Tables 1 and 2 below.

＜曲げ剛性の測定方法＞
吸収体のような物体の曲げ剛性は、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：川端季雄著、「風合い評価の標準化と解析」、第２版、社団法人日本繊維機会学会 風合い計量と規格化研究委員会、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ＫＥＳ－ＦＢ２－ＡＵＴＯ－Ａ（純曲げ試験機）、ＫＥＳ－ＦＢ２－ＡＵＴＯ－Ｌ（大型曲げ試験機）を用いて、第１コア側積層構造の吸液前の曲げ剛性Ｂｄ及び吸液後の曲げ剛性Ｂｗ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。 <Measurement method of bending rigidity>
It is generally known that the bending stiffness of an object such as an absorbent body can be expressed as a value measured by KES (Kawabata Evaluation System) manufactured by Kato Tech Co., Ltd. (References: Norio Kawabata, "Standardization and Analysis of Texture Evaluation," 2nd edition, Japan Textile Machinery Society Textile Measurement and Standardization Research Committee, published July 10, 1980). Specifically, we used KES-FB2-AUTO-A (pure bending tester) and KES-FB2-AUTO-L (large-scale bending tester) manufactured by Kato Tech Co., Ltd. to test the absorption of the laminated structure on the first core side. The bending rigidity B d before liquid absorption and the bending rigidity B w after liquid absorption can be measured. The measurement procedure is as follows.

（吸液前の曲げ剛性Ｂｄの測定方法）
測定装置として、カトーテック株式会社製のＫＥＳ－ＦＢ２－ＡＵＴＯ－Ａ（純曲げ試験機）を用いる。下記＜サンプルの調製方法＞により調製したサンプルを、測定装置の試験台に取りつけ、１ｃｍの間隔のチャックに把持する。サンプルに対して、曲率Ｋ＝－２．５～＋２．５ｃｍ－１の範囲で、等速度曲率の純曲げを行う。変形速度は０．５０ｃｍ－１／ｓｅｃで、１サイクル変形を行う。吸液前の曲げ剛性Ｂｄは、曲率０．５～１．５間及び－０．５～－１．５間の曲げモーメントの傾きの平均値から算出する。縦方向Ｘ、横方向Ｙ及び斜め方向Ｄそれぞれについて、吸液前の曲げ剛性Ｂｄを測定する。 (Measurement method of bending rigidity B d before liquid absorption)
As a measuring device, KES-FB2-AUTO-A (pure bending tester) manufactured by Kato Tech Co., Ltd. is used. A sample prepared according to the following <Sample Preparation Method> is mounted on a test stand of a measuring device, and held in a chuck with an interval of 1 cm. The sample is subjected to pure bending with constant velocity curvature in the range of curvature K=-2.5 to +2.5 cm -1 . One cycle of deformation is performed at a deformation speed of 0.50 cm −1 /sec. The bending rigidity B d before liquid absorption is calculated from the average value of the slope of the bending moment between curvatures of 0.5 and 1.5 and between -0.5 and -1.5. The bending rigidity B d before liquid absorption is measured in each of the longitudinal direction X, the lateral direction Y, and the diagonal direction D.

（吸液後の曲げ剛性Ｂｗの測定方法）
測定装置として、カトーテック株式会社製のＫＥＳ－ＦＢ２－ＡＵＴＯ－Ｌ（大型曲げ試験機）を用いる。下記＜サンプルの調製方法＞により調製したサンプルを生理食塩水に３０分浸した後、キムタオル等の吸水性シートを用いて、サンプルから水分が漏出しない程度に水分をふき取り、吸液後サンプルとする。吸液後サンプルを、測定装置の試験台に取りつけ、４ｃｍの間隔のチャックに把持する。吸液後サンプルに対して、曲率Ｋ＝－０．４～＋０．４ｃｍ－１の範囲で、等速度曲率の曲げを行う。変形速度は０．５０ｃｍ－１／ｓｅｃで、１サイクル変形を行う。吸液後の曲げ剛性Ｂｗは、曲率０．１～０．３間及び－０．１～－０．３間の曲げモーメントの傾きの平均値から算出する。縦方向Ｘ、横方向Ｙ及び斜め方向Ｄそれぞれについて、吸液後の曲げ剛性Ｂｗを測定する。 (Method for measuring bending rigidity Bw after liquid absorption)
As a measuring device, KES-FB2-AUTO-L (large-scale bending tester) manufactured by Kato Tech Co., Ltd. is used. After soaking the sample prepared according to the following <Sample Preparation Method> in physiological saline for 30 minutes, use a water-absorbing sheet such as a Kim towel to wipe off moisture to the extent that no moisture leaks from the sample, and use it as a sample after liquid absorption. . After absorbing the liquid, the sample is attached to the test stand of the measuring device and held in a chuck with a spacing of 4 cm. After absorbing the liquid, the sample is subjected to constant curvature bending within the range of curvature K = -0.4 to +0.4 cm -1 . One cycle of deformation is performed at a deformation speed of 0.50 cm −1 /sec. The bending rigidity Bw after liquid absorption is calculated from the average value of the slope of the bending moment between curvatures of 0.1 and 0.3 and between -0.1 and -0.3. The bending rigidity Bw after liquid absorption is measured in each of the vertical direction X, the horizontal direction Y, and the diagonal direction D.

＜吸液前後の厚み変化量Ｔ０ｃの測定方法＞
測定装置として、カトーテック株式会社製のＫＥＳ－Ｇ５ハンディー圧縮試験機を用いる。サンプルを測定装置の試験台に取りつけ、面積２ｃｍ２の円形平面を持つ合板間でサンプルを圧縮することで、サンプルに４．９ｍＮ／ｃｍ２（＝０．５ｇｆ／ｃｍ２）の荷重をかけ、その状態でサンプルの厚みを測定する。圧縮速度は０．５ｍｍ／ｓｅｃ、圧縮最大荷重は５０ｇ／ｃｍ２とする。
第１コア側積層構造の吸液前の４．９ｍＮ／ｃｍ２荷重下での厚みＴ０ｄを測定する場合、下記＜サンプルの調製方法＞により調製したサンプル（乾燥状態のサンプル）をそのままサンプルとして使用する。
第１コア側積層構造の吸液後の４．９ｍＮ／ｃｍ２荷重下での厚みＴ０ｗを測定する場合、下記＜サンプルの調製方法＞により調製したサンプル（乾燥状態のサンプル）を生理食塩水に３０分浸した後、キムタオル等の吸水性シートを用いて、サンプルから水分が漏出しない程度に水分をふき取ったもの（吸液後サンプル）をサンプルとして使用する。
吸液後の厚みＴ０ｗから吸液前の厚みＴ０ ｄ を差し引く（Ｔ０ｗ－Ｔ０ｄ）ことにより、吸液前後の厚み変化量Ｔ０ｃを算出する。
<Method for measuring thickness change T0 c before and after liquid absorption>
As a measuring device, a KES-G5 handy compression tester manufactured by Kato Tech Co., Ltd. is used. The sample was attached to the test stand of the measuring device, and a load of 4.9 mN/cm 2 (=0.5 gf/cm 2 ) was applied to the sample by compressing it between plywood boards with a circular plane with an area of 2 cm 2 . In this state, measure the thickness of the sample. The compression speed is 0.5 mm/sec, and the maximum compression load is 50 g/cm 2 .
When measuring the thickness T0 d of the first core side laminated structure before liquid absorption under a load of 4.9 mN/ cm2 , use the sample (dry sample) prepared by the following <Sample Preparation Method> as the sample. use.
When measuring the thickness T0 w of the first core side laminated structure after liquid absorption under a load of 4.9 mN/ cm2 , the sample (dry sample) prepared by the following <Sample Preparation Method> was soaked in physiological saline. After immersing the sample in water for 30 minutes, use a water-absorbing sheet such as a Kim towel to wipe off the water to an extent that no water leaks from the sample (sample after liquid absorption) and use it as a sample.
By subtracting the thickness T0 d before liquid absorption from the thickness T0 w after liquid absorption (T0 w - T0 d ), the amount of change in thickness T0 c before and after liquid absorption is calculated.

＜サンプルの調製方法＞
吸収性物品から測定対象（第１コア側積層構造：第１シート、第１コア及び中間シートからなる積層構造）を取り出す。その際、測定対象が、接着剤によって他の部材と接合されている場合は、その接合部分を、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、本明細書中の全ての測定において共通である。
測定対象から以下の手順でサンプルを調製する。図８及び図９にはサンプルの調製手順が示されている。図８は、縦方向Ｘ又は横方向Ｙの曲げ剛性Ｂｄ，Ｂｗを測定するためのサンプルＳＸ，ＳＹの調製手順、図９は、斜め方向Ｄの曲げ剛性Ｂｄ，Ｂｗを測定するためのサンプルＳＤの調製手順である。
縦方向Ｘの曲げ剛性測定用サンプルＳＸ、横方向Ｙの曲げ剛性測定用サンプルＳＹを調製する場合、図８を参照して、測定対象である第１コア側積層構造１７（第１シート１１、第１コア及１４及び中間シート１３からなる積層構造）から、縦方向Ｘ及び横方向Ｙの長さがそれぞれ１０ｃｍの平面視正方形形状を切り出し（図８（ａ）参照）、その切り出した切片Ｓの四辺それぞれに、別途作製した保護シートＰを貼り付けて、サンプルＳＸ，ＳＹを得る（図８（ｂ）参照）。保護シートＰは、平面視長方形形状（１１ｃｍ×３ｃｍ）の基材シートＰ１の片面の長手方向に沿う両側縁部に、一対の接着部材Ｐ２，Ｐ２を貼り付けたものである（図８（ｃ）参照）。各接着部材Ｐ２は、ホットメルト接着剤等の接着剤からなり、平面視長方形形状（１１ｃｍ×０．５ｃｍ）を有している。一対の接着部材Ｐ２，Ｐ２のうちの一方の接着部材Ｐ２が、切片Ｓとの貼り付けに使用され、他方の接着部材Ｐ２は、基材シートＰ１とともに、切片Ｓから外方に延出されて、曲げ剛性測定時にサンプルＳＸ，ＳＹを測定装置（試験台）に固定するのに使用される。サンプルＳＸ，ＳＹは、それぞれ、平面視正方形形状を有し、一辺の長さは１１ｃｍである。図８中符号ＢＬで示す線は、曲げ剛性測定時の当該サンプルの折り曲げ線である。
斜め方向Ｄの曲げ剛性測定用サンプルＳＤを調製する場合、図９を参照して、測定対象である第１コア側積層構造１７から、横方向Ｙとのなす角度θ（鋭角）が４５度である方向すなわち斜め方向Ｄの長さ７ｃｍ、斜め方向Ｄと直交する方向の長さが１１ｃｍの平面視長方形形状を切り出し、その切り出した切片Ｓの四辺それぞれに前記と同様に保護シートＰを貼り付けて、サンプルＳＤを得る。なお切片Ｓは、斜め方向Ｄに沿う辺が短辺となればよく、その短辺の長さは第１コア側積層構造１７の大きさ等に応じて適宜変更することができ、７ｃｍである必要は無く、例えば３ｃｍでもよい。 <Sample preparation method>
The object to be measured (first core-side laminated structure: laminated structure consisting of a first sheet, a first core, and an intermediate sheet) is taken out from the absorbent article. At this time, if the object to be measured is joined to another member by an adhesive, the adhesive force is removed by blowing cold air from a cold spray on the joined portion before taking it out. This procedure is common to all measurements herein.
Prepare a sample from the measurement target using the following procedure. The sample preparation procedure is shown in FIGS. 8 and 9. FIG. 8 shows the procedure for preparing samples SX and SY for measuring the bending stiffness B d and B w in the longitudinal direction X or the lateral direction Y, and FIG . This is the procedure for preparing sample SD.
When preparing the sample SX for measuring the bending stiffness in the longitudinal direction X and the sample SY for measuring the bending stiffness in the transverse direction Y, referring to FIG. From the laminated structure consisting of the first core 14 and the intermediate sheet 13, a square shape in a plan view having lengths of 10 cm in the longitudinal direction A separately produced protective sheet P is pasted on each of the four sides to obtain samples SX and SY (see FIG. 8(b)). The protective sheet P has a pair of adhesive members P2, P2 attached to both edges along the longitudinal direction of one side of a base sheet P1 having a rectangular shape (11 cm x 3 cm) in plan view (Fig. 8(c) )reference). Each adhesive member P2 is made of an adhesive such as a hot melt adhesive and has a rectangular shape (11 cm x 0.5 cm) in plan view. One of the pair of adhesive members P2, P2 is used to attach the section S, and the other adhesive member P2 is extended outward from the section S together with the base sheet P1. , is used to fix samples SX and SY to the measuring device (test stand) during bending rigidity measurement. Samples SX and SY each have a square shape in plan view, and the length of one side is 11 cm. The line indicated by the symbol BL in FIG. 8 is the bending line of the sample at the time of bending rigidity measurement.
When preparing a sample SD for bending stiffness measurement in the diagonal direction D, with reference to FIG. Cut out a rectangular shape in plan view with a length of 7 cm in a certain direction, that is, the diagonal direction D, and a length of 11 cm in the direction orthogonal to the diagonal direction D, and attach a protective sheet P to each of the four sides of the cut section S in the same manner as above. to obtain sample SD. Note that the short side of the section S may be the side along the diagonal direction D, and the length of the short side can be changed as appropriate depending on the size of the first core side laminated structure 17, etc., and is 7 cm. It is not necessary, and may be 3 cm, for example.

基材シートＰ１の素材、坪量としては、曲げ剛性の測定に影響を及ぼさない範囲で任意に設定することができ、素材に関しては、例えば不織布、樹脂フィルム等が挙げられ、坪量に関しては、５～２０ｇ／ｍ２程度である。基材シートＰ１の具体例として、坪量１７ｇ／ｍ２のスパンボンド不織布が挙げられる。
接着部材Ｐ２における接着剤の坪量、塗布パターンとしては、曲げ剛性の測定に影響を及ぼさず且つサンプルＳＸ，ＳＹ，ＳＤの吸液後に保護シートＰが脱落しない（切片Ｓ中の吸水性ポリマーが漏出しない）範囲で任意に設定することができる。接着部材Ｐ２の具体例として、ホットメルト接着剤を固形分としての坪量が６ｇ／ｍ２となるようにスロットスプレー方式で塗布されてなるものが挙げられる。 The material and basis weight of the base sheet P1 can be arbitrarily set within a range that does not affect the measurement of bending rigidity, and examples of the material include nonwoven fabric, resin film, etc., and the basis weight: It is about 5 to 20 g/ m2 . A specific example of the base sheet P1 is a spunbond nonwoven fabric having a basis weight of 17 g/m 2 .
The basis weight and application pattern of the adhesive in the adhesive member P2 should be such that it does not affect the measurement of bending rigidity and that the protective sheet P does not fall off after absorbing the samples SX, SY, and SD (the water-absorbing polymer in the section S It can be set arbitrarily within the range (no leakage). A specific example of the adhesive member P2 is one in which a hot melt adhesive is applied using a slot spray method so that the solid basis weight is 6 g/m 2 .

＜吸液後凹凸視認性の評価方法＞
評価対象の吸収性物品（使い捨ておむつ）から吸収性本体（表面シート、吸収体及び裏面シートの積層体）を取り出し、該吸収性本体の肌対向面（表面シート側）の中央部に、生理食塩水２００ｇを１分間かけて注入した後、３０分間静置し、しかる後、該吸収性本体を、肌対向面を内面側にして縦方向（長手方向）に二つ折りした。１０名の専門パネラーに、この二つ折りされた吸収性本体を外面側（非肌対向面側）から目視してもらい、凹凸の見え難さを１０点満点で評価してもらった。１０名分の評価点の平均値を、当該評価対象の吸液後凹凸視認性の評価点とした。この評価点が大きいほど、吸液状態での凹凸が視認し難いと判断され、高評価となる。 <Evaluation method of unevenness visibility after liquid absorption>
Take out the absorbent body (a laminate of a top sheet, an absorbent body, and a back sheet) from the absorbent article (disposable diaper) to be evaluated, and add physiological saline to the center of the skin-facing surface (top sheet side) of the absorbent body. After injecting 200 g of water over 1 minute, it was allowed to stand for 30 minutes, and then the absorbent body was folded in half in the vertical direction (longitudinal direction) with the skin-facing surface facing the inner surface. Ten expert panelists were asked to visually inspect the bifold absorbent body from the outside side (non-skin facing side) and rate the difficulty of seeing the unevenness on a scale of 10 to 10. The average value of the evaluation scores of 10 people was taken as the evaluation score for the visibility of unevenness after liquid absorption of the evaluation target. The higher the evaluation score, the more difficult it is to visually recognize the unevenness in the liquid absorption state, and the higher the evaluation.

＜吸液後柔軟性の評価方法＞
評価対象の吸収性物品（使い捨ておむつ）から吸収性本体（表面シート、吸収体及び裏面シートの積層体）を取り出し、該吸収性本体の肌対向面（表面シート側）の中央部に、生理食塩水１６０ｇを１分間かけて注入した後、３０分間静置し、しかる後、該吸収性本体を、肌対向面を内側にして縦方向（長手方向）に二つ折りした。１０名の専門パネラーに、この二つ折りされた吸収性本体の折り曲げ部及びその近傍を中心に手指で自由に触ってもらい、該吸収性本体の柔らかさを１０点満点で評価してもらった。１０名分の評価点の平均値を、当該評価対象の吸液後柔軟性の評価点とした。この評価点が大きいほど、吸液状態での柔軟性に優れると判断され、高評価となる。 <Evaluation method of flexibility after liquid absorption>
Take out the absorbent body (a laminate of a top sheet, an absorbent body, and a back sheet) from the absorbent article (disposable diaper) to be evaluated, and add physiological saline to the center of the skin-facing surface (top sheet side) of the absorbent body. After 160 g of water was injected over 1 minute, it was allowed to stand for 30 minutes, and then the absorbent body was folded in half in the vertical direction (longitudinal direction) with the skin-facing surface facing inside. Ten expert panelists were asked to freely touch the folded absorbent body with their hands and fingers, mainly at the folded part and its vicinity, and were asked to rate the softness of the absorbent body on a scale of 10 to 10. The average value of the evaluation scores of 10 people was taken as the evaluation score of the flexibility after liquid absorption of the evaluation target. The higher the evaluation score, the more excellent the flexibility in the liquid absorption state, and the higher the evaluation.

＜液吸収性の評価方法＞
評価対象の吸収性物品（使い捨ておむつ）から吸収体を取り出し、傾斜角度３０°の傾斜面上に、該吸収体の第２コア側を上にして配置した。その際、吸収体の縦方向（長手方向）を傾斜面の傾斜方向に一致させるとともに、該吸収体の前側（腹側）を傾斜方向の下方側に配置した。こうして傾斜面上に配置された吸収体の上面の中央部に、生理食塩水を１回の注入量４０ｇとして５分間隔で繰り返し５回注入した後（総注入量２００ｇ）、該吸収体の重量（吸液後重量）を測定し、該吸液後重量から該吸収体の生理食塩水注入前の重量を差し引くことで液吸収量（ｇ）を算出し、下記評価基準により評価した。
（液吸収性の評価基準）
Ａ（良い）：５回注入後の液吸収量が、１６０ｇ以上
Ｂ（やや悪い）：５回注入後の液吸収量が、１００ｇ以上１６０ｇ未満
Ｃ（悪い）：５回注入後の液吸収量が、１００ｇ未満 <Evaluation method of liquid absorption>
The absorbent body was taken out from the absorbent article (disposable diaper) to be evaluated, and placed on an inclined surface with an inclination angle of 30°, with the second core side of the absorbent body facing upward. At that time, the longitudinal direction (longitudinal direction) of the absorbent body was aligned with the direction of inclination of the slope, and the front side (ventral side) of the absorbent body was arranged on the lower side of the direction of inclination. After repeatedly injecting physiological saline 5 times at 5 minute intervals (total injection amount 200 g) into the center of the upper surface of the absorber placed on the slope, the weight of the absorber was The amount of liquid absorbed (g) was calculated by subtracting the weight of the absorber before physiological saline injection from the weight after liquid absorption, and evaluated according to the following evaluation criteria.
(Liquid absorbency evaluation criteria)
A (good): The amount of liquid absorbed after 5 injections is 160 g or more B (slightly bad): The amount of liquid absorbed after 5 injections is 100 g or more and less than 160 g C (bad): The amount of liquid absorbed after 5 injections But less than 100g

Figure 0007411430000001
Figure 0007411430000001

Figure 0007411430000002
Figure 0007411430000002

表１及び表２に示すとおり、各実施例は、１）第１コアの形成材料の９０質量％以上が吸水性ポリマーであり、且つ２）縦方向、横方向及び斜め方向の全てでＢＲ≦５．０／ｍｍが成立していることから、第１コアの少なくとも股下部に対応する領域において吸水性ポリマーが均一に分布しており、且つ３）深さＣ２Ｄに対する深さＣ１Ｄの割合が４０％以下であるため、前記２）及び３）を満たさない比較例１～２に比べて、高評価であった。
また、実施例２と比較例３との対比から、吸液後に吸収性物品の外面に吸収体の壊れを想起させるような凹凸を発生させず、吸液後の柔軟性を確保し、液吸収性を向上させるためには、吸収体として、第１コアと第２コアとの積層構造を採用することが有効であることがわかる。 As shown in Tables 1 and 2, in each example, 1) 90% by mass or more of the material forming the first core is a water-absorbing polymer, and 2) BR≦ in all the vertical, horizontal, and diagonal directions. 5.0/mm, the water-absorbing polymer is uniformly distributed at least in the region corresponding to the crotch of the first core, and 3) the ratio of depth C1D to depth C2D is 40. % or less, it was highly evaluated compared to Comparative Examples 1 and 2, which did not satisfy 2) and 3) above.
In addition, from a comparison between Example 2 and Comparative Example 3, it was found that after liquid absorption, no unevenness was generated on the outer surface of the absorbent article that would suggest breakage of the absorbent body, flexibility after liquid absorption was ensured, and liquid absorption was achieved. It can be seen that it is effective to adopt a laminated structure of a first core and a second core as an absorber in order to improve the properties.

１ 使い捨ておむつ（吸収性物品）
２ 吸収性本体
３ 表面シート
４ 裏面シート
１０ 吸収体
１１ 第１シート
１２ 第２シート
１２Ｅ 第２シートの延出部
１３ 中間シート
１４ 第１コア
１５ 第２コア
１５Ｍ 貫通孔非形成部
１５Ｎ 貫通孔
２０ 吸水性ポリマー
２１～２５ 接着剤
２６ 柱状部
Ｃ１ 吸液状態の吸収体の肌対向面側の凹部
Ｃ２ 吸液状態の吸収体の非肌対向面側の凹部
５ フラップ部
６ 防漏カフ
Ａ 腹側部
Ｂ 股下部
Ｃ 背側部
Ｘ 縦方向
Ｙ 横方向 1 Disposable diapers (absorbent articles)
2 Absorbent main body 3 Top sheet 4 Back sheet 10 Absorbent core 11 First sheet 12 Second sheet 12E Extension of second sheet 13 Intermediate sheet 14 First core 15 Second core 15M Part without through holes 15N Through holes 20 Water-absorbing polymer 21 to 25 Adhesive 26 Columnar part C1 Recessed part on the skin-facing side of the absorbent body in a liquid-absorbing state C2 Recessed part 5 on the non-skin-facing side of the absorbent body in a liquid-absorbing state Flap part 6 Leak-proof cuff A Ventral side Part B Crotch C Dorsal part X Vertical direction Y Lateral direction

Claims (17)

着用者の前後方向に対応する縦方向と該縦方向に直交する横方向とを有し、着用者の股間部に配される股下部と、該股下部よりも着用者の腹側に配される腹側部と、該股下部よりも着用者の背側に配される背側部とを備える吸収性物品に用いられる吸収体であって、
中間シートと、該中間シートの非肌対向面側に配される第１シートと、該中間シートの肌対向面側に配される第２シートとを具備し、該第１シートと該中間シートとの間に、吸水性材料として少なくとも吸水性ポリマーを含有する第１コアが介在配置され、該中間シートと該第２シートとの間に、吸液により膨潤する吸水性の第２コアが介在配置されており、
前記第２コアの前記股下部に対応する領域に、該第２コアを厚み方向に貫通する貫通孔が形成され、該貫通孔と平面視で重なる領域において、前記第２シートと前記中間シートとが、該第２コアにおける該貫通孔の周辺の貫通孔非形成部と平面視で重なる領域よりも近接しており、
前記第１コアの形成材料の９０質量％以上が吸水性ポリマーであり、
前記第１コアの前記股下部に対応する領域において、前記吸水性ポリマーが均一に分布しており、
前記第１コアは、前記第２コアに比べて主面の面積が大きく、該主面は、該第１コア又は該第２コアにおける最大面積を有する面であり、
前記吸収体は、吸液状態において、前記貫通孔と平面視で重なる領域の肌対向面側及び非肌対向面側に凹部を有し、該非肌対向面側の凹部の深さが、該肌対向面側の凹部の深さの４０％以下である、吸収体。 It has a vertical direction corresponding to the front and back direction of the wearer and a horizontal direction perpendicular to the longitudinal direction, and has a crotch area located in the wearer's crotch area and a crotch area located on the ventral side of the wearer from the crotch area. An absorbent article for use in an absorbent article comprising: a ventral side portion;
an intermediate sheet, a first sheet disposed on the non-skin facing surface side of the intermediate sheet, and a second sheet disposed on the skin facing surface side of the intermediate sheet, the first sheet and the intermediate sheet A first core containing at least a water-absorbing polymer as a water-absorbing material is interposed between the intermediate sheet and the second sheet, and a water-absorbing second core that swells by liquid absorption is interposed between the intermediate sheet and the second sheet. It is located
A through hole passing through the second core in the thickness direction is formed in a region corresponding to the crotch portion of the second core, and in a region overlapping with the through hole in a plan view, the second sheet and the intermediate sheet is closer than a region of the second core that overlaps the through-hole non-formed portion around the through-hole in a plan view,
90% by mass or more of the material forming the first core is a water-absorbing polymer,
In a region corresponding to the crotch portion of the first core, the water-absorbing polymer is uniformly distributed;
The first core has a main surface area larger than that of the second core, and the main surface is a surface having the largest area in the first core or the second core,
In a liquid absorbing state, the absorbent body has recesses on the skin-facing surface side and the non-skin-facing surface side in a region that overlaps with the through-hole in plan view, and the depth of the recesses on the non-skin-facing surface side is equal to or greater than the skin-facing surface. The absorber has a depth of 40% or less of the recess on the opposing surface side. 前記貫通孔と平面視で重なる領域の前記非肌対向面側の凹部の深さが３ｍｍ未満である、請求項１に記載の吸収体。 The absorbent body according to claim 1, wherein the depth of the concave portion on the non-skin facing surface side in a region overlapping with the through hole in plan view is less than 3 mm. 前記貫通孔と平面視で重なる領域における前記第２シートの肌対向面を基準として、該第２シートにおける前記貫通孔非形成部に対応する部分の肌対向面の該基準からの厚み方向に沿う離間距離をＤ１、前記中間シートにおける該貫通孔非形成部に対応する部分の非肌対向面の該基準からの厚み方向に沿う離間距離をＤ２とした場合、該離間距離Ｄ１の方が、該離間距離Ｄ２に比べて、前記吸収体の吸液に伴う増加の程度が大きい、請求項１又は２に記載の吸収体。 Based on the skin-facing surface of the second sheet in a region overlapping with the through-hole in plan view, along the thickness direction of the skin-facing surface of the portion of the second sheet corresponding to the non-through-hole portion from the reference. When the separation distance is D1, and the separation distance along the thickness direction from the reference of the non-skin facing surface of the portion of the intermediate sheet corresponding to the non-through-hole formed portion is D2, the separation distance D1 is greater than the non-skin-facing surface of the intermediate sheet. The absorbent body according to claim 1 or 2, wherein the separation distance D2 increases to a greater degree as the absorbent body absorbs liquid. 前記吸収体の吸液状態において、前記離間距離Ｄ１の方が、前記離間距離Ｄ２に比べて長い、請求項３に記載の吸収体。 The absorbent body according to claim 3, wherein the separation distance D1 is longer than the separation distance D2 in the liquid absorption state of the absorbent body. 前記吸収体の吸液状態において、前記第１コアの前記貫通孔非形成部に対応する部分に比べて、該第１コアの前記貫通孔に対応する部分の厚みが大きい、請求項１～４の何れか１項に記載の吸収体。 Claims 1 to 4, wherein in a liquid absorption state of the absorbent body, a portion of the first core corresponding to the through hole is thicker than a portion of the first core corresponding to the portion where no through hole is formed. The absorber according to any one of the above. 前記第１シート、前記第１コア及び前記中間シートからなる積層構造の、下記式（１）で算出される吸液前後の厚み変化量あたりの曲げ剛性変化率をＢＲとした場合、少なくとも該第１コアの前記股下部に対応する領域において、前記縦方向、前記横方向並びに該縦方向及び該横方向の双方に交差する斜め方向の三方向の該ＢＲが、それぞれ５．０／ｍｍ以下である、請求項１～５の何れか１項に記載の吸収体。
ＢＲ＝（Ｂｗ／Ｂｄ）／Ｔ０ｃ （１）
Ｂｗ：前記積層構造の吸液後の曲げ剛性
Ｂｄ：前記積層構造の吸液前の曲げ剛性
Ｔ０ｃ：下記式（２）で算出される前記積層構造の吸液前後の厚み変化量
Ｔ０ｃ＝Ｔ０ｗ－Ｔ０ｄ （２）
Ｔ０ｗ：前記積層構造の吸液後の４．９ｍＮ／ｃｍ２荷重下での厚み
Ｔ０ｄ：前記積層構造の吸液前の４．９ｍＮ／ｃｍ２荷重下での厚み If BR is the bending rigidity change rate per thickness change before and after liquid absorption calculated by the following formula (1) of the laminated structure consisting of the first sheet, the first core, and the intermediate sheet, at least the first In the region corresponding to the crotch of one core, the BR in three directions, the vertical direction, the horizontal direction, and the diagonal direction intersecting both the vertical direction and the horizontal direction, is 5.0/mm or less, respectively. The absorbent body according to any one of claims 1 to 5.
BR=(Bw/Bd)/T0c (1)
Bw: Bending rigidity of the laminated structure after liquid absorption Bd: Bending rigidity of the laminated structure before liquid absorption T0c: Amount of change in thickness of the laminated structure before and after liquid absorption calculated by the following formula (2) T0c = T0w - T0d (2)
T0w: Thickness of the laminated structure after liquid absorption under 4.9 mN/cm 2 loads T0d: Thickness of the laminated structure before liquid absorption under 4.9 mN/cm 2 loads 前記三方向から任意に選択される二方向どうしの前記Ｂｗの比率が、それぞれ０．８以上１．２以下である、請求項６に記載の吸収体。 The absorber according to claim 6, wherein the ratio of the Bw in two directions arbitrarily selected from the three directions is 0.8 or more and 1.2 or less, respectively. 前記吸収体の吸液状態において、前記第１シート、前記第１コア及び前記中間シートからなる積層構造の圧縮変形率と、前記第２シート、前記第２コア及び該中間シートからなる積層構造の圧縮変形率との比率が、前者＞後者を前提として、前者／後者として、２．０以上である、請求項１～７の何れか１項に記載の吸収体。 In the liquid absorbing state of the absorbent body, the compressive deformation rate of the laminated structure consisting of the first sheet, the first core and the intermediate sheet, and the compressive deformation rate of the laminated structure consisting of the second sheet, the second core and the intermediate sheet. The absorbent body according to any one of claims 1 to 7, wherein the ratio of the compression deformation rate to the compression deformation ratio is 2.0 or more as the former/latter, assuming that the former>the latter. 前記第２コアの肌対向面及び非肌対向面に接着剤に接着剤が塗布されており、該第２コアの非肌対向面側の接着剤の方が、該第２コアの肌対向面側の接着剤に比べて、単位面積当たりの塗布量が多い、請求項１～８の何れか１項に記載の吸収体。 An adhesive is applied to the skin-facing surface and the non-skin-facing surface of the second core, and the adhesive on the non-skin-facing surface of the second core is stronger than the adhesive on the skin-facing surface of the second core. The absorbent body according to any one of claims 1 to 8, wherein the amount of application per unit area is larger than that of the adhesive on the side. 前記貫通孔と平面視で重なる領域において、前記第２シートと前記中間シートとが接合されているとともに、該中間シートと前記第１シートとが接合されている、請求項１～９の何れか１項に記載の吸収体。 Any one of claims 1 to 9, wherein the second sheet and the intermediate sheet are joined together, and the intermediate sheet and the first sheet are joined in a region that overlaps with the through hole in a plan view. The absorber according to item 1. ＪＩＳ Ｐ８１４１に準じて測定されるクレム吸水高さに関し、「前記第１シート≦前記第２シート＜前記中間シート」の大小関係が成立し、且つ該中間シートの該クレム吸水高さが２０ｍｍ以上である、請求項１～１０の何れか１項に記載の吸収体。 Regarding the Klemm water absorption height measured according to JIS P8141, the size relationship of "the first sheet ≦ the second sheet < the intermediate sheet" is established, and the Klemm water absorption height of the intermediate sheet is 20 mm or more. The absorbent body according to any one of claims 1 to 10. 前記中間シートは、クレープ率が５％以上の紙であり、前記第２シートは、クレープ率が１％未満である、請求項１～１１の何れか１項に記載の吸収体。 The absorbent body according to any one of claims 1 to 11, wherein the intermediate sheet is paper with a crepe rate of 5% or more, and the second sheet has a crepe rate of less than 1%. 前記第２シートが不織布を含んで構成されている、請求項１～１２の何れか１項に記載の吸収体。 The absorbent body according to any one of claims 1 to 12, wherein the second sheet includes a nonwoven fabric. 前記吸収体の平面視において、前記第２コアは、前記第１コアの周縁に囲まれた領域に収まるように配置されている、請求項１～１３の何れか１項に記載の吸収体。The absorbent body according to any one of claims 1 to 13, wherein the second core is arranged in a region surrounded by a periphery of the first core when the absorbent body is viewed from above. 前記第２コアは、少なくとも吸水性繊維及び吸水性ポリマーを含有し、The second core contains at least a water-absorbing fiber and a water-absorbing polymer,
前記第１コアは、前記第２コアに比べて、吸水性ポリマーの坪量が小さい、請求項１～１４の何れか１項に記載の吸収体。The absorbent body according to any one of claims 1 to 14, wherein the first core has a lower basis weight of the water-absorbing polymer than the second core. 前記第１コアの吸水性ポリマーの坪量と前記第２コアの吸水性ポリマーの坪量との比率が、前者＜後者を前提として、後者／前者として、１．１以上１０．０以下である、請求項１５に記載の吸収体。The ratio of the basis weight of the water-absorbing polymer of the first core to the basis weight of the water-absorbing polymer of the second core is 1.1 or more and 10.0 or less, assuming that the former < the latter, and the ratio of the latter to the former is 1.1 or more and 10.0 or less. , the absorbent body according to claim 15. 請求項１～１６の何れか１項に記載の吸収体を備えた吸収性物品。
An absorbent article comprising the absorbent body according to any one of claims 1 to 16 .
JP2020014516A 2019-12-23 2020-01-31 Absorbent bodies and absorbent articles Active JP7411430B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080086391.7A CN114845679B (en) 2019-12-23 2020-12-23 Absorbent body and absorbent article
PCT/JP2020/048066 WO2021132294A1 (en) 2019-12-23 2020-12-23 Absorbent and absorbent article

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019231045 2019-12-23
JP2019231045 2019-12-23

Publications (3)

Publication Number Publication Date
JP2021097986A JP2021097986A (en) 2021-07-01
JP2021097986A5 JP2021097986A5 (en) 2022-12-19
JP7411430B2 true JP7411430B2 (en) 2024-01-11

Family

ID=76541972

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2020014516A Active JP7411430B2 (en) 2019-12-23 2020-01-31 Absorbent bodies and absorbent articles

Country Status (3)

Country Link
JP (1) JP7411430B2 (en)
CN (1) CN114845679B (en)
WO (1) WO2021132294A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023029233A (en) * 2021-08-19 2023-03-03 花王株式会社 absorbent article

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000201976A (en) 1998-11-09 2000-07-25 Kao Corp Thickening processing article of humor or excrement
WO2014208729A1 (en) 2013-06-28 2014-12-31 大王製紙株式会社 Absorbent product
JP2016502870A (en) 2012-12-10 2016-02-01 ザ プロクター アンド ギャンブルカンパニー Absorbent articles with high absorbent material content
JP2017104255A (en) 2015-12-09 2017-06-15 株式会社リブドゥコーポレーション Absorbent article

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9044359B2 (en) * 2008-04-29 2015-06-02 The Procter & Gamble Company Disposable absorbent article with absorbent particulate polymer material distributed for improved isolation of body exudates
WO2012086265A1 (en) * 2010-12-24 2012-06-28 花王株式会社 Absorbent and absorbent article
CN105997356B (en) * 2011-05-27 2017-11-14 花王株式会社 Absorbent commodity
CN103607989B (en) * 2011-06-10 2017-05-24 宝洁公司 Absorbent structure for absorbent articles
JP6013729B2 (en) * 2011-12-27 2016-10-25 株式会社リブドゥコーポレーション Water-absorbent resin powder and absorbent body and absorbent article using the same
BR112015025638A2 (en) * 2013-04-08 2017-07-18 Procter & Gamble absorbent articles with barrier leg clamps
JP6316575B2 (en) * 2013-11-27 2018-04-25 株式会社リブドゥコーポレーション Absorber and absorbent article having the same
JP2016010516A (en) * 2014-06-27 2016-01-21 ユニ・チャーム株式会社 Disposable clothing article
CN106804103A (en) * 2014-09-12 2017-06-06 宝洁公司 The non-woven material in the discrete 3 D deformation portion with the base portion opening wide with base binder to extra play
JP6386883B2 (en) * 2014-11-10 2018-09-05 花王株式会社 Absorbent articles
JP6329983B2 (en) * 2016-03-24 2018-05-23 大王製紙株式会社 Absorbent articles
JP6320467B2 (en) * 2016-07-08 2018-05-09 ユニ・チャーム株式会社 Absorbent articles
JP6734727B2 (en) * 2016-08-04 2020-08-05 花王株式会社 Absorbent article
TWI762504B (en) * 2016-09-07 2022-05-01 日商大王製紙股份有限公司 Incontinence absorbent articles
JP6756213B2 (en) * 2016-09-23 2020-09-16 王子ホールディングス株式会社 Absorbents and absorbent articles
JP6371814B2 (en) * 2016-09-29 2018-08-08 大王製紙株式会社 Absorbent articles
KR102016053B1 (en) * 2016-09-30 2019-08-29 유니 참 코포레이션 Absorbent articles
JP6755334B2 (en) * 2016-11-30 2020-09-16 ユニ・チャーム株式会社 Absorbent, its manufacturing method, and absorbent article
JP6850598B2 (en) * 2016-12-19 2021-03-31 花王株式会社 Absorbent article
JP6414348B2 (en) * 2017-01-17 2018-10-31 王子ホールディングス株式会社 Absorbent articles
JP2018201891A (en) * 2017-06-06 2018-12-27 王子ホールディングス株式会社 Absorbent article

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000201976A (en) 1998-11-09 2000-07-25 Kao Corp Thickening processing article of humor or excrement
JP2016502870A (en) 2012-12-10 2016-02-01 ザ プロクター アンド ギャンブルカンパニー Absorbent articles with high absorbent material content
WO2014208729A1 (en) 2013-06-28 2014-12-31 大王製紙株式会社 Absorbent product
JP2017104255A (en) 2015-12-09 2017-06-15 株式会社リブドゥコーポレーション Absorbent article

Also Published As

Publication number Publication date
CN114845679A (en) 2022-08-02
CN114845679B (en) 2023-03-31
JP2021097986A (en) 2021-07-01
WO2021132294A1 (en) 2021-07-01

Similar Documents

Publication Publication Date Title
RU2603608C2 (en) Absorbent product with prominent structure adjacent to body
JP2018508265A (en) Absorbent article forming a three-dimensional bowl
JP2017528182A (en) A series of absorbent articles having channel forming areas
JP6396755B2 (en) Absorbent articles
JP7452976B2 (en) absorbent articles
JP7388868B2 (en) absorbent articles
KR102606001B1 (en) Liquid-permeable sheets for absorbent articles
EP3653186B1 (en) Absorbent article
JP7411430B2 (en) Absorbent bodies and absorbent articles
JP6473323B2 (en) Absorbent articles
JP2020188920A (en) Absorbent article
CN114206285B (en) Absorbent article
JP7122481B2 (en) Absorbent bodies and absorbent articles
JP7260396B2 (en) absorbent article
RU2789888C1 (en) Absorbent element and absorbent article
RU2790644C1 (en) Absorbent element and absorbent product
JP5843598B2 (en) Absorbent articles for women
JP7424943B2 (en) absorbent articles
JP7436326B2 (en) absorbent articles
RU2782916C1 (en) Absorbent product
JP7405628B2 (en) absorbent articles
JP7409996B2 (en) absorbent articles
JP7424928B2 (en) absorbent articles
JP7410711B2 (en) absorbent articles
JP2018068441A (en) Absorbent article

Legal Events

Date Code Title Description
A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20221209

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20221209

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20230718

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20230914

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20231219

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20231225

R151 Written notification of patent or utility model registration

Ref document number: 7411430

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151