JP6808315B2

JP6808315B2 - Absorbent article

Info

Publication number: JP6808315B2
Application number: JP2015235206A
Authority: JP
Inventors: 前田　勝司; 勝司前田; 幸男笹嶋
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2015-12-01
Filing date: 2015-12-01
Publication date: 2021-01-06
Anticipated expiration: 2035-12-01
Also published as: JP2017099639A

Description

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

おむつなどの吸収性物品は、着用者の背側及び腹側を覆う部分にウエストギャザーを配して肌にフィットさせるようにしている（例えば特許文献１）。
特許文献２には、上記の肌へのフィット性に関し、後胴回り域における厚みの違いによる段差を解消するためのおむつの構成が記載されている。具体的には、おむつの後側ウエスト伸縮シートを吸収性コアの後側端部と重ねた配置とすることが記載されている。さらに、前記吸収コアの後側端部は、意図しない***を防止するため、他の部位よりも目付けが低い、または吸収性コアが存在しない低剛性部を幅方向中央に１つ有する。また、吸収性コアの後側ウエスト伸縮シートと重なる部分全体の厚みを、目付け低減やエンボスにより薄くすることが記載されている。
特許文献３には、ウエスト弾性部材とは別に、肌面側に立体ガードを設け、該立体ガードを吸収体端部の***物誘導部に重なる配置としたおむつが記載されている。立体ガードは、表面シートよりも肌側に自由端を有し、弾性部材により幅方向に伸縮性を有する。***物誘導部は、吸収体をエンボス加工等で圧縮、または構成成分を偏在させてなる凹部で構成されており、該凹部に沿って***部を立体ガード内部へ誘導する。一方、前記ウエスト弾性部材は***物誘導部とは重なっていない。 For absorbent articles such as diapers, waist gathers are arranged on the back side and the ventral side of the wearer so as to fit the skin (for example, Patent Document 1).
Patent Document 2 describes the configuration of a diaper for eliminating a step due to a difference in thickness in the rear waist circumference region with respect to the above-mentioned fit to the skin. Specifically, it is described that the rear waist elastic sheet of the diaper is arranged so as to overlap the rear end portion of the absorbent core. Further, the rear end portion of the absorption core has one low-rigidity portion in the center in the width direction, which has a lower basis weight than other portions or has no absorbent core, in order to prevent an unintended ridge. In addition, it is described that the thickness of the entire portion overlapping the rear waist elastic sheet of the absorbent core is reduced by reducing the basis weight or embossing.
Patent Document 3 describes a diaper in which a three-dimensional guard is provided on the skin surface side separately from the waist elastic member, and the three-dimensional guard is arranged so as to overlap the excrement guiding portion at the end of the absorber. The three-dimensional guard has a free end on the skin side of the surface sheet, and has elasticity in the width direction due to an elastic member. The excrement guiding portion is composed of recesses formed by compressing the absorber by embossing or the like or unevenly distributing the constituent components, and guides the excrement portion into the three-dimensional guard along the recesses. On the other hand, the waist elastic member does not overlap with the excrement guiding portion.

特開２００７−２０２５７６号公報JP-A-2007-202576 特開２０１５−２４０５１号公報JP 2015-24051 特開２０００−３３３９８６号公報Japanese Unexamined Patent Publication No. 2000-333986

特許文献２のように吸収体の後側（背側）端部に低剛性部を設けたり、端部全体を薄くしたりすると吸収容量が低下し、背側からの***物の漏れが生じやすくなってしまう。特に大人用おむつの場合は尿とりパッドを併用することが多く、背側における吸収容量の低下は大きな問題となる。具体的には、着用者が横になった状態で、尿とりパッドの背中側で尿がこぼれてアウターであるおむつに移行することがあり、その位置に十分な吸収容量がなければ尿はそのまま流れて漏れに繋がってしまう。特に前記低剛性部は着用者の背骨に対応する吸収体を大きくカットしているため漏れ発生の可能性が高まる。また、特許文献３に記載のおむつでは、立体ガードが尿とりパッドで塞がれるため上記のような尿漏れへの対応は難しい。
加えて、特許文献２のように前記低剛性部を幅方向中央部のみに配した吸収体では、背骨に対応する中央部の変形性よりも両側部の変形性が劣る。この変形性に応じて、おむつの肌へフィット性は中央部よりも両側部で劣る。一方、着用者の肌は、背骨付近よりも両側部から脇腹へ至る柔らかい部分の方が変化しやすい。そのため、おむつ等の肌へのフィット性及びこれによる漏れ防止の観点からは、吸収体としては両側部での変形性が重要となる。しかし、前述のとおり、吸収体において単にカット部分を増やしては吸収容量が低下し、むしろ漏れ防止性が低下しかねない。 If a low-rigidity portion is provided at the rear (dorsal) end of the absorber as in Patent Document 2, or if the entire end is thinned, the absorption capacity is reduced and excrement is likely to leak from the dorsal side. turn into. Especially in the case of adult diapers, a urine absorbing pad is often used together, and a decrease in absorption capacity on the dorsal side becomes a big problem. Specifically, when the wearer is lying down, urine may spill on the back side of the urine absorbing pad and shift to the outer diaper, and if there is not enough absorption capacity at that position, the urine will remain as it is. It will flow and lead to leakage. In particular, since the low-rigidity portion greatly cuts the absorber corresponding to the wearer's spine, the possibility of leakage increases. Further, in the diaper described in Patent Document 3, it is difficult to deal with the above-mentioned urine leakage because the three-dimensional guard is blocked by the urine collecting pad.
In addition, in the absorber in which the low-rigidity portion is arranged only in the central portion in the width direction as in Patent Document 2, the deformability of both side portions is inferior to the deformability of the central portion corresponding to the spine. Due to this deformability, the diaper's fit to the skin is poorer on both sides than in the center. On the other hand, the wearer's skin is more likely to change in the soft part from both sides to the flank than in the vicinity of the spine. Therefore, from the viewpoint of fit to the skin of diapers and the like and prevention of leakage due to this, deformability on both sides is important as an absorber. However, as described above, simply increasing the number of cut portions in the absorber may reduce the absorption capacity and rather reduce the leakage prevention property.

本発明は、上記の問題点に鑑み、吸収性物品の背側領域におけるフィット性の向上と背側からの漏れ防止とを両立することに関する。 In view of the above problems, the present invention relates to both improving the fit in the dorsal region of the absorbent article and preventing leakage from the dorsal side.

本発明は、肌当接面側の表面シート、非肌当接面側の裏面シート、及び両シート間の吸収体を備え、着用者の腹側に配される腹側領域、股下に配される股下領域、及び背側に配される背側領域に区分される長手方向と、該長手方向に直交する幅方向とを有する吸収性物品であって、前記吸収体は、該吸収体の背側端部から腹側に延びる、周囲よりも吸収体材料の目付が小さい薄肉部を有し、該薄肉部は幅方向に複数並んでおり、前記薄肉部と長手方向において重なる位置にウエストギャザー部が配されている吸収性物品を提供する。 The present invention includes a front surface sheet on the skin contact surface side, a back surface sheet on the non-skin contact surface side, and an absorber between both sheets, and is arranged in the ventral region and inseam arranged on the ventral side of the wearer. An absorbent article having a longitudinal direction divided into an inseam region and a dorsal region arranged on the dorsal side and a width direction orthogonal to the longitudinal direction, wherein the absorber is the back of the absorber. It has a thin-walled portion that extends from the side end to the ventral side and has a smaller grain size of the absorber material than the surroundings, and a plurality of the thin-walled portions are lined up in the width direction, and the waist gather portion overlaps with the thin-walled portion in the longitudinal direction. Provide an absorbent article in which is arranged.

本発明の吸収性物品は、吸収性物品の背側領域におけるフィット性の向上と背側からの漏れ防止とを両立することとができる。 The absorbent article of the present invention can achieve both improvement of fit in the dorsal region of the absorbent article and prevention of leakage from the dorsal side.

本発明の吸収性物品の好ましい一実施形態としてのテープ型おむつを、肌当接面側から模式的に示した、一部切欠平面図である。FIG. 5 is a partially cutaway plan view schematically showing a tape-type diaper as a preferred embodiment of the absorbent article of the present invention from the skin contact surface side. 図１のテープ型おむつにおける吸収体背側端部の薄肉部を含む幅方向断面を模式的に示す断面図である。FIG. 5 is a cross-sectional view schematically showing a cross-sectional view in the width direction including a thin-walled portion of the dorsal end of the absorber in the tape-type diaper of FIG. 図１のテープ型おむつにおける吸収体が２層からなる場合の薄肉部の別の好ましい態様を示す図２相当の断面図である。FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing another preferred embodiment of the thin-walled portion when the absorber in the tape-type diaper of FIG. 1 is composed of two layers. 薄肉部の別の好ましい態様を示す図２相当の断面図である。FIG. 2 is a cross-sectional view corresponding to FIG. 2 showing another preferred embodiment of the thin-walled portion. 薄肉部の別の好ましい態様を示す図３相当の断面図である。It is sectional drawing corresponding to FIG. 3 which shows another preferable aspect of the thin-walled part. 薄肉部同士の間隔、薄肉部の幅を示す説明図である。It is explanatory drawing which shows the space between thin-walled portions and the width of a thin-walled portion. （Ａ）は薄肉部同士の間隔を異ならせる態様を部分的に示す説明図であり、（Ｂ）は各薄肉部の幅を異ならせる態様を部分的に説明図である。(A) is an explanatory view partially showing a mode in which the distance between the thin-walled portions is different, and (B) is a partial explanatory view showing a mode in which the width of each thin-walled portion is different. （Ａ）は薄肉部同士の間隔を異ならせて吸収体背側部の幅方向全体に配置した態様を示す平面図であり、（Ｂ）は各薄肉部の幅を異ならせて吸収体背側部の幅方向全体に配置した態様を示す平面図であり、（Ｃ）は（Ａ）及び（Ｂ）を併せた態様を示す平面図であり、（Ｄ）は各薄肉部の長手方向の長さを異ならせた態様を示す平面図である。(A) is a plan view showing an aspect in which the thin-walled portions are arranged in the entire width direction of the back side of the absorber with different distances, and (B) is a different width of each thin-walled portion on the back side of the absorber. It is a plan view which shows the aspect which arranged in the whole width direction of the part, (C) is the plan view which shows the aspect which combined (A) and (B), and (D) is the length in the longitudinal direction of each thin-walled part. It is a top view which shows the mode which made the difference.

本発明に係る吸収性物品の好ましい実施形態（第１実施形態）としてのテープ型おむつについて、図１を参照して以下に説明する。 A tape-type diaper as a preferred embodiment (first embodiment) of the absorbent article according to the present invention will be described below with reference to FIG.

本明細書においては、特に断らない限り、人体に接触する側を肌当接面側といい、これと反対側を非肌当接面側という。吸収性物品の平面視において、装着者の腹側から股下を介して背側にわたる領域に向けて配置される方向を、吸収性物品の長手方向（Ｙ方向）という。この長手方向と直交する方向を幅方向（Ｘ方向）という。また、長手方向に長さを有する部材ないし部位において、該部位の腹側に向かう端部を腹側端部といい、背側に向かう端部を背側端部という。さらに、吸収性物品の長手方向および幅方向に垂直な方向を厚み方向（Ｚ方向）といい、Ｚ方向における長さを厚みという。 In the present specification, unless otherwise specified, the side in contact with the human body is referred to as the skin contact surface side, and the opposite side is referred to as the non-skin contact surface side. In the plan view of the absorbent article, the direction in which the absorbent article is arranged from the ventral side to the dorsal side through the inseam is referred to as the longitudinal direction (Y direction) of the absorbent article. The direction orthogonal to the longitudinal direction is called the width direction (X direction). Further, in a member or a portion having a length in the longitudinal direction, the end portion toward the ventral side of the portion is referred to as a ventral end portion, and the end portion toward the dorsal side is referred to as a dorsal end portion. Further, the direction perpendicular to the longitudinal direction and the width direction of the absorbent article is referred to as a thickness direction (Z direction), and the length in the Z direction is referred to as a thickness.

図１は、本実施形態のテープ型おむつ１０の展開状態を表している。ここで、展開状態とは、各部を伸長させて吸収性物品を平面状に拡げた状態をいう。 FIG. 1 shows the unfolded state of the tape-type diaper 10 of the present embodiment. Here, the unfolded state means a state in which each part is stretched to spread the absorbent article in a plane.

図１に示すように、テープ型おむつ１０は、長手方向に沿って、装着時に着用者の腹側に配される腹側領域Ｆ、着用者の股下に配される股下領域Ｃ、着用者の背側に配される背側領域Ｒに区分される。テープ型おむつ１０の形状から明確に各部位が区分できないときは、テープ型おむつ１０を長手方向（Ｙ方向）に３等分し、装着者の腹側寄りに配される領域から順に、腹側領域Ｆ、股下領域Ｃ、背側領域Ｒと区分する。以下、テープ型使い捨ておむつ１０は単におむつ１０ともいう。 As shown in FIG. 1, the tape-type diaper 10 has a ventral region F arranged on the ventral side of the wearer at the time of wearing, an inseam region C arranged on the inseam of the wearer, and a wearer's inseam along the longitudinal direction. It is divided into a dorsal region R arranged on the dorsal side. If each part cannot be clearly distinguished from the shape of the tape-type diaper 10, divide the tape-type diaper 10 into three equal parts in the longitudinal direction (Y direction), and in order from the area arranged closer to the ventral side of the wearer, the ventral side. It is divided into a region F, an inseam region C, and a dorsal region R. Hereinafter, the tape-type disposable diaper 10 is also simply referred to as a diaper 10.

テープ型おむつ１０は、肌当接面側の表面シート１、非肌当接面側の裏面シート２、および両シート１及び２の間に介在配置された液保持性の吸収体３を有する。さらに、表面シート１の肌当接面側に、長手方向（Ｙ方向）両側部から幅方向（Ｘ方向）外方に向けて一対のサイドシート４が配されている。裏面シート２の非肌当接面側には、その全面を覆うように不織布からなる外装シート（図示せず）が配されていてもよい。この外装シートによって、おむつ１０の外側は柔らかな肌触りおよび風合いのあるものとなる。 The tape-type diaper 10 has a front surface sheet 1 on the skin contact surface side, a back surface sheet 2 on the non-skin contact surface side, and a liquid-retaining absorber 3 interposed between both sheets 1 and 2. Further, a pair of side sheets 4 are arranged on the skin contact surface side of the surface sheet 1 from both sides in the longitudinal direction (Y direction) toward the outside in the width direction (X direction). An exterior sheet (not shown) made of a non-woven fabric may be arranged on the non-skin contact surface side of the back sheet 2 so as to cover the entire surface thereof. This exterior sheet gives the outside of the diaper 10 a soft touch and texture.

表面シート１、裏面シート２及びサイドシート４は、吸収体３の長手方向外方及び幅方向外方に延出して接合されている。さらに、表面シート１、裏面シート２及びサイドシート４は、腹側領域Ｆおよび背側領域Ｒにおいて幅方向（Ｘ方向）外方に延出してフラップ部１７をなしている（腹側領域Ｆのフラップ部を腹側フラップ部１７Ｆ、背側領域Ｒのフラップ部を背側フラップ部１７Ｒと区別していうことがある。）。
これにより、おむつ１０の外形は、背側領域Ｒ及び腹側領域Ｆが股下領域Ｃよりも幅方向に張出した形状、言い換えれば股下領域Ｃが括れた形状である。また、吸収体３も股下部Ｃが括れた形状を有する。ただし、吸収体３の形状はこれに限定されず、例えば矩形など種々の形状とすることができる。 The front surface sheet 1, the back surface sheet 2, and the side sheet 4 are joined so as to extend outward in the longitudinal direction and outward in the width direction of the absorber 3. Further, the front surface sheet 1, the back surface sheet 2, and the side sheet 4 extend outward in the width direction (X direction) in the ventral region F and the dorsal region R to form a flap portion 17 (of the ventral region F). The flap portion may be distinguished from the ventral flap portion 17F, and the flap portion of the dorsal region R may be distinguished from the dorsal flap portion 17R).
As a result, the outer shape of the diaper 10 is such that the dorsal region R and the ventral region F project in the width direction from the inseam region C, in other words, the inseam region C is constricted. In addition, the absorber 3 also has a shape in which the inseam C is constricted. However, the shape of the absorber 3 is not limited to this, and various shapes such as a rectangle can be used.

さらに、おむつ１０の背側フラップ部１７Ｒの幅方向（Ｘ方向）の左右両端部には、おむつ止着用のファスニングテープ１８とテープ基部１９とが配されている。具体的には、テープ基部１９が、背側フラップ部１７Ｒの幅方向端部に接合され、さらにテープ基部１９の幅方向端部にファスニングテープ１８が接合されている。 Further, a fastening tape 18 for wearing a diaper stopper and a tape base 19 are arranged at both left and right ends of the dorsal flap portion 17R of the diaper 10 in the width direction (X direction). Specifically, the tape base 19 is joined to the widthwise end of the dorsal flap 17R, and the fastening tape 18 is joined to the widthwise end of the tape base 19.

本実施形態において、吸収体３は、背側領域Ｒの部分（以降、吸収体背側部３Ｒという。）に、背側端部３５から腹側に延びる、周囲よりも吸収体材料の目付が小さい薄肉部３１を有する。薄肉部３１は、吸収体３の背側端部３５に沿って幅方向に複数並んで配置されている。薄肉部３１、３１の間は、吸収体材料で満たされ薄肉部３１よりも目付の大きい厚肉部３２となっている。厚肉部３２は吸収体３の股下領域Ｃへと連続している。なお、吸収体材料とは、液を吸収保持する材料であり、例えばパルプ等の繊維材料や高吸収ポリマーなどである。なお、本実施形態においては、薄肉部３１は、吸収体３の腹側領域Ｆの部分にも同様の態様で配されている。
加えて、薄肉部３１と長手方向に重なる位置に、幅方向に伸縮するウエストギャザー部５がテープ基部１９、１９の間で幅方向に配されている。長手方向に重なる範囲において、ウエストギャザー部５が薄肉部３１、３１間を幅方向に繋いでいる。この重なる配置により、ウエストギャザー部５は、吸収体３の背側端部３５から腹側へ向かう所定範囲の領域を直接的に幅方向に伸縮させる。ウエストギャザー部５は、おむつ１０の背側領域Ｒのうち弾性部材５１が配置される領域全体を意味する。ウエストギャザー部５がおむつ１０の背側領域Ｒを幅方向に伸縮させる機能を有すれば、弾性部材５１は幅方向に連続的に配されてもよく、断続的に配されてもよい。本実施形態において、弾性部材５１は、吸収体３と裏面シート２との間に幅方向に連続的に配された複数本の糸状部材である。ただし、部材としてはこれに限定されず、シート状のものでもよく、裏面シート自体を伸縮性のシートで構成するようにしてもよい。いずれの部材であっても、弾性部材５１は、幅方向に、伸長状態でかつ伸縮可能に配置される。本実施形態においては、伸長状態にされた弾性部材５１は、左右のテープ基部１９の内側の固定部５２で接合固定され、両固定部５２、５２間で伸縮可能にされている。なお、弾性部材５１の配置は、本実施形態のものに限定されず、この種の物品で採用される種々の配置形態とすることができる。 In the present embodiment, the absorber 3 has a basis weight of the absorber material extending ventrally from the dorsal end portion 35 in the portion of the dorsal region R (hereinafter referred to as the dorsal portion 3R of the absorber). It has a small thin portion 31. A plurality of thin-walled portions 31 are arranged side by side in the width direction along the dorsal end portion 35 of the absorber 3. The space between the thin parts 31 and 31 is filled with an absorber material to form a thick part 32 having a basis weight larger than that of the thin part 31. The thick portion 32 is continuous with the inseam region C of the absorber 3. The absorbent material is a material that absorbs and retains the liquid, and is, for example, a fiber material such as pulp or a highly absorbent polymer. In the present embodiment, the thin-walled portion 31 is also arranged in the ventral region F of the absorber 3 in the same manner.
In addition, a waist gather portion 5 that expands and contracts in the width direction is arranged in the width direction between the tape bases 19 and 19 at a position that overlaps the thin wall portion 31 in the longitudinal direction. In the range where they overlap in the longitudinal direction, the waist gather portion 5 connects the thin portions 31 and 31 in the width direction. Due to this overlapping arrangement, the waist gather portion 5 directly expands and contracts the region of a predetermined range from the dorsal end portion 35 of the absorber 3 toward the ventral side in the width direction. The waist gather portion 5 means the entire region of the dorsal region R of the diaper 10 where the elastic member 51 is arranged. If the waist gather portion 5 has a function of expanding and contracting the dorsal region R of the diaper 10 in the width direction, the elastic members 51 may be arranged continuously in the width direction or may be arranged intermittently. In the present embodiment, the elastic member 51 is a plurality of thread-like members continuously arranged in the width direction between the absorber 3 and the back surface sheet 2. However, the member is not limited to this, and may be a sheet-like member, and the back surface sheet itself may be composed of an elastic sheet. In any of the members, the elastic member 51 is arranged in the width direction in an elongated state and expandable and contractible. In the present embodiment, the stretched elastic member 51 is joined and fixed by the fixing portions 52 inside the left and right tape bases 19, and can be expanded and contracted between the fixing portions 52 and 52. The arrangement of the elastic member 51 is not limited to that of the present embodiment, and may be various arrangement forms adopted in this type of article.

このようにウエストギャザー部５は、吸収体３の幅方向に並ぶ複数の薄肉部３１と長手方向において重なる位置にある。またこの重なりにおいて、ウエストギャザー部５は、薄肉部３１、３１間を幅方向に繋いでいる。これにより、おむつ１０の背側領域Ｒが肌との間の隙間を抑えて優しくフィットし、背側領域Ｒでの液漏れが抑えられる。この点について以下に詳細する。 As described above, the waist gather portion 5 is positioned so as to overlap the plurality of thin-walled portions 31 arranged in the width direction of the absorber 3 in the longitudinal direction. Further, in this overlap, the waist gather portion 5 connects the thin portions 31 and 31 in the width direction. As a result, the dorsal region R of the diaper 10 suppresses the gap between the diaper 10 and the skin and fits gently, and liquid leakage in the dorsal region R is suppressed. This point will be described in detail below.

吸収体３において、薄肉部３１は、目付が小さいことで他の部分よりも柔軟な変形が可能な部分である。すなわち薄肉部３１は吸収体背側部３Ｒにおける可撓部である。可撓部としての薄肉部３１が幅方向に複数あることで、これらを幅方向に繋ぐウエストギャザー部５の伸縮に合わせて、吸収体背側部３Ｒ全体が均等に変形（伸縮）しやすい。ウエストギャザー部５の伸縮は、幅方向中心線Ｔへ向かう矢印Ｘ１、Ｘ１で示す方向の「収縮」と、幅方向中心線Ｔから幅方向外方へ向かう矢印Ｘ２、Ｘ２で示す方向の「伸長」とを含む。
前記変形としては、例えば、ウエストギャザー部５の収縮で、薄肉部３１が非肌側ないし肌側へ突出して幅方向に折り畳たまれる変形、薄肉部３１の疎な部分が幅方向に収縮する変形等がある。また、ウエストギャザー部５が伸長する際は、薄肉部３１の形状が復元する変形となる。しかもこれらの変形が、薄肉部３１と長手方向に重なるウエストギャザー部５の伸縮力の直接的な作用で、複数の薄肉部３１全体に均等にはっきりと生じる。これにより、吸収体背側部３Ｒがウエストギャザー部５の伸縮に追従して幅方向に変形し、おむつ１０の背側領域Ｒの幅方向の伸縮性が高まる。その結果、着用者の背中から脇腹に至る背側全体へのおむつ１０のフィット性が向上する。またこの伸縮性により、着用者の体勢変化で生じる肌表面の起伏形状の変形に対し、おむつ１０の追従性が高くなる。これにより、おむつ１０と着用者の背側との隙間が生じ難くなり、漏れ防止性を高める。
加えて、薄肉部３１は、厚肉部３２間を跨いで複数の薄肉部３１間を繋ぐウエストギャザー部５の収縮に伴って、幅方向に収縮し空間が狭まる。このとき、薄肉部３１は、毛管力が働きやすくなって導液作用をし、腹側への延出方向に沿って液を引き込みやすい。また、幅方向に複数存在する厚肉部３２が、ウエストギャザー部５における収縮により互いに接近して液吸収の連携性を高める。以上の、互いに連携する複数の厚肉部３２と、その間で毛管力が働く複数の薄肉部３１との協働作用により、吸収体背側部３Ｒにおける液引き込み性を高める。このことが背側からの液漏れ防止性をさらに高め、尿とりパッドの背側からこぼれる尿等をも引き込んで吸収することができる。 In the absorber 3, the thin-walled portion 31 is a portion that can be deformed more flexibly than other portions due to its small basis weight. That is, the thin portion 31 is a flexible portion in the dorsal portion 3R of the absorber. Since there are a plurality of thin-walled portions 31 as flexible portions in the width direction, the entire dorsal portion 3R of the absorber is likely to be uniformly deformed (expanded and contracted) in accordance with the expansion and contraction of the waist gather portion 5 connecting these in the width direction. The expansion and contraction of the waist gather portion 5 includes "contraction" in the directions indicated by arrows X1 and X1 toward the center line T in the width direction and "extension" in the directions indicated by arrows X2 and X2 outward in the width direction from the center line T in the width direction. Including.
As the deformation, for example, when the waist gather portion 5 contracts, the thin-walled portion 31 protrudes to the non-skin side or the skin side and is folded in the width direction, and the sparse portion of the thin-walled portion 31 contracts in the width direction. There is deformation etc. Further, when the waist gather portion 5 is extended, the shape of the thin wall portion 31 is restored. Moreover, these deformations are evenly and clearly generated in the entire plurality of thin-walled portions 31 by the direct action of the elastic force of the waist gather portion 5 overlapping the thin-walled portion 31 in the longitudinal direction. As a result, the dorsal portion 3R of the absorber is deformed in the width direction following the expansion and contraction of the waist gather portion 5, and the elasticity of the dorsal region R of the diaper 10 in the width direction is enhanced. As a result, the fit of the diaper 10 to the entire dorsal side from the wearer's back to the flank is improved. Further, due to this elasticity, the diaper 10 has a high followability to the deformation of the undulating shape of the skin surface caused by the change in the posture of the wearer. As a result, a gap between the diaper 10 and the wearer's back side is less likely to occur, and leakage prevention is improved.
In addition, the thin-walled portion 31 contracts in the width direction and the space is narrowed as the waist gather portion 5 straddling the thick-walled portions 32 and connecting the plurality of thin-walled portions 31. At this time, the thin-walled portion 31 easily exerts a capillary force to conduct a liquid-conducting action, and easily draws in the liquid along the extending direction to the ventral side. Further, a plurality of thick portions 32 existing in the width direction approach each other due to contraction in the waist gather portion 5 to enhance the cooperation of liquid absorption. The above-mentioned cooperative action between the plurality of thick-walled portions 32 that cooperate with each other and the plurality of thin-walled portions 31 on which the capillary force acts between them enhances the liquid drawing property in the dorsal portion 3R of the absorber. This further enhances the liquid leakage prevention property from the dorsal side, and can also draw in and absorb urine or the like spilling from the dorsal side of the urine absorbing pad.

上記作用の観点から、個々の薄肉部３１は、収縮変形時に薄肉部３１の両側縁３１７、３１７が接触しやすい平面形状であることが好ましい。例えば、両側縁３１７、３１７が、背側端部３５に向かうにつれ互いに離れるのではなく、平行である態様が好ましい。また、背側端部３５に向かうにつれ近づいていく態様であることがより好ましい。これにより、ウエストギャザー部５の収縮に伴って、薄肉部３１の両側縁３１７、３１７、特に両側縁の背側端部３１８，３１８同士が接触しやすくなり、吸収体３の背側端部３５からの液の漏出防御性が高まる。このことが上記作用と相俟って、吸収体３の腹側方向への液引き込み性を高める。なお、薄肉部３１の両側縁とは厚肉部３２との境界部分のことである。後述するように薄肉部３１の態様により境界部分の部位は異なり、薄肉吸収部Ａ、凹部３１Ｂ、貫通孔Ｃ〜Ｅのいずれかの部位で隣接する厚肉部３２との境界部分をいう。 From the viewpoint of the above action, it is preferable that each thin-walled portion 31 has a planar shape in which both side edges 317 and 317 of the thin-walled portion 31 can easily come into contact with each other during contraction deformation. For example, it is preferable that the side edges 317 and 317 are parallel to each other rather than separated from each other toward the dorsal end 35. Further, it is more preferable that the mode approaches the dorsal end portion 35. As a result, as the waist gather portion 5 contracts, both side edges 317 and 317 of the thin-walled portion 31, especially the dorsal end portions 318 and 318 of both side edges are easily brought into contact with each other, and the dorsal end portion 35 of the absorber 3 Increases the protection against leakage of liquid from. This, in combination with the above action, enhances the ventral drawing property of the absorber 3. The both side edges of the thin portion 31 are the boundary portions with the thick portion 32. As will be described later, the boundary portion differs depending on the mode of the thin-walled portion 31, and refers to the boundary portion between the thin-walled absorbing portion A, the recess 31B, and the through holes C to E and the adjacent thick-walled portion 32.

また、吸収体背側部３Ｒにおける柔軟な変形と吸収容量の保持の両立の観点から、両側縁３１７、３１７は、腹側に向かうにつれ近づく態様であることが好ましい。図１においては、両側縁３１７、３１７は１点の腹側端部３１９に収束する形状としていている。ただし、この態様に限定されるものでなく、１点に収束せずに近づく形状（図示せず）であってもよい。 Further, from the viewpoint of achieving both flexible deformation in the dorsal portion 3R of the absorber and retention of the absorption capacity, it is preferable that the side edges 317 and 317 are in a mode of approaching toward the ventral side. In FIG. 1, both side edges 317 and 317 have a shape that converges on the ventral end portion 319 at one point. However, the present invention is not limited to this aspect, and a shape (not shown) that approaches one point without converging may be used.

個々の薄肉部３１は、吸収体３の背側端部３５から腹側へ延出する形状であれば、必ずしもおむつ１０の長手方向と並行でなくてもよい。例えば、幅方向の中心から外方に行くほど薄肉部３１の背側端部３５側を幅方向中心へと傾斜させた態様であってもよい。この態様では、吸収体背側部３Ｒがより幅方向に収縮しやすく、液漏出をより確実に防止することができる。 The individual thin-walled portions 31 do not necessarily have to be parallel to the longitudinal direction of the diaper 10 as long as they have a shape extending ventrally from the dorsal end portion 35 of the absorber 3. For example, the dorsal end 35 side of the thin wall portion 31 may be inclined toward the center in the width direction toward the outside from the center in the width direction. In this aspect, the dorsal portion 3R of the absorber is more likely to contract in the width direction, and liquid leakage can be prevented more reliably.

薄肉部３１は、吸収体３を構成する吸収体材料の目付が他よりも小さい部分であれば、吸収体材料を有する態様、有さない態様の両方を含む。また、吸収体３が複数の層の積層体からなる場合、いずれかの層における目付が小さい部分とその位置における他の層の部分とを合わせた部分を薄肉部３１という。 The thin-walled portion 31 includes both a mode having the absorber material and a mode having no absorber material as long as the basis weight of the absorber material constituting the absorber 3 is smaller than the others. Further, when the absorber 3 is composed of a laminated body of a plurality of layers, a portion in which the portion having a small basis weight in any of the layers and the portion of the other layer at that position are combined is referred to as a thin-walled portion 31.

例えば、薄肉部３１が吸収体材料を有する態様の具体例としては、図２に示すような、厚みの薄い薄肉吸収部３１Ａと凹部３１Ｂとからなる態様が挙げられる。このように目付が小さく厚みが薄いことで薄肉部３１が吸収体３の背側端部における可撓部となる。なお、図示しないが、目付が小さければ、凹部３１Ｂを有さずに、密度を他の部分よりも低減して繊維間空間を広くした密度の疎な部分であってもよい。この場合でも、薄肉部３１が他の部分よりも柔らかくなり、吸収体３の背側端部における可撓部となる。 For example, as a specific example of the embodiment in which the thin-walled portion 31 has an absorber material, there is an embodiment including a thin-walled absorbing portion 31A and a recess 31B as shown in FIG. Since the basis weight is small and the thickness is thin as described above, the thin-walled portion 31 becomes a flexible portion at the dorsal end portion of the absorber 3. Although not shown, if the basis weight is small, it may be a sparsely-dense portion in which the interfiber space is widened by reducing the density as compared with other portions without having the recess 31B. Even in this case, the thin portion 31 becomes softer than the other portions and becomes a flexible portion at the dorsal end portion of the absorber 3.

図２において、凹部３１Ｂは薄肉吸収部３１Ａの肌当接面側に配されている。本発明においては、この配置に限定されず、凹部３１Ｂが薄肉部３１Ｂの非肌当接面側に配されてもよい。ただし、凹部３１が肌当接面側にあって肌に向けて開口している方が着用者の肌への負担軽減の観点から好ましい。すなわち、ウエストギャザー部５の収縮で、凹部３１Ｂの空間が縮まって薄肉吸収部３１Ａが非肌当接面側に凸の形状になり、おむつ１０の肌当接面は、着用者の身体を包み込むような優しい肌接触となる。また、凹部３１は、着用者の身体の動きにより凹部３１Ｂの空間が増減して通気路ないし排気路となっておむつ１０内側のムレ低減に寄与する。 In FIG. 2, the recess 31B is arranged on the skin contact surface side of the thin-walled absorbing portion 31A. In the present invention, the arrangement is not limited to this, and the recess 31B may be arranged on the non-skin contact surface side of the thin portion 31B. However, it is preferable that the recess 31 is on the skin contact surface side and opens toward the skin from the viewpoint of reducing the burden on the wearer's skin. That is, due to the contraction of the waist gather portion 5, the space of the recess 31B is contracted so that the thin-walled absorbing portion 31A has a convex shape toward the non-skin contact surface side, and the skin contact surface of the diaper 10 wraps the wearer's body. It becomes such a gentle skin contact. Further, the recess 31 increases or decreases the space of the recess 31B due to the movement of the wearer's body and becomes an air passage or an exhaust passage, which contributes to the reduction of stuffiness inside the diaper 10.

薄肉部３１が吸収体材料を有する態様の別の具体例としては、図３に示すような、２層部分を含む態様が挙げられる。この態様では、吸収体３は、肌側吸収層３８とこれよりも幅狭にされた非肌側吸収層３９との積層体からなる。２層が重なる部分においては、肌側吸収層３８が肌側貫通孔３１Ｃを幅方向に複数有し、その非肌面当接面側を非肌側吸収層３９が塞いでいる。肌側貫通孔３１Ｃを塞ぐ非肌側吸収部３９の部分が、吸収体３全体における薄肉吸収部３１Ａとなる。この薄肉吸収部３１Ａと肌側貫通孔３１Ｃとで薄肉部３１をなす。２層部分において薄肉部３１に隣接する部分が厚肉部３２となる。一方、１層（肌側吸収層３８）のみからなる両側部においては、単層貫通孔３１Ｄと単層の厚肉部３２とを有する。
この態様においては、着用者の背骨付近に配される幅方向中央部分では、２層部分で吸収容量を確保して背骨付近からの液漏れに対応できる。一方、幅方向の両側縁付近では、肌側吸収層３８の１層のみからなる部分で、変形性を高めている。これにより、前述したおむつ１０の背側領域Ｒの伸縮性とともに、背側の、特に液漏れしやすい幅方向中央部分における液吸収容量を更に高めることができる。
また、この態様においては、吸収体３の吸収容量を保持しつつ、薄肉部３１の幅や長さ、数などを着用者の肌表面の起伏形状の変形の程度に合わせた設計の幅が広がる。例えば、吸収体背側部３Ｒにおける幅方向中央部分よりも両側外方において薄肉部３１の幅や長さ、数などを増やして、両側外方部分の変形性を更に高めることができる。薄肉部３１の上記設定は、２層部分と１層部分とに跨って変化を付けることで、変形性と吸収容量との所望の組み合わせを設定できる。これにより、着用者の肌表面の起伏形状の変形が少ない背骨付近に当接する、おむつ１０の背側領域Ｒの幅方向中央付近では伸縮を抑えて肌へのフィット性をさらに高く維持できる。そして、背骨の両脇から脇腹に至る肌の柔らかい部分に当接する、おむつ１０の背側領域Ｒの幅方向両側部では高い伸縮性で、体勢変化に追従して隙間を抑えてフィットし続けることができる。 As another specific example of the embodiment in which the thin-walled portion 31 has the absorber material, there is an embodiment including a two-layer portion as shown in FIG. In this aspect, the absorber 3 is composed of a laminate of a skin-side absorbing layer 38 and a non-skin-side absorbing layer 39 narrower than the skin-side absorbing layer 38. In the portion where the two layers overlap, the skin-side absorbing layer 38 has a plurality of skin-side through holes 31C in the width direction, and the non-skin-side absorbing layer 39 closes the non-skin-side contact surface side thereof. The portion of the non-skin side absorbing portion 39 that closes the skin side through hole 31C becomes the thin-walled absorbing portion 31A in the entire absorber 3. The thin-walled absorbing portion 31A and the skin-side through hole 31C form a thin-walled portion 31. The portion of the two-layer portion adjacent to the thin-walled portion 31 is the thick-walled portion 32. On the other hand, both side portions including only one layer (skin side absorption layer 38) have a single layer through hole 31D and a single layer thick portion 32.
In this aspect, in the central portion in the width direction arranged in the vicinity of the wearer's spine, the absorption capacity can be secured in the two-layer portion to cope with liquid leakage from the vicinity of the spine. On the other hand, in the vicinity of both side edges in the width direction, the deformability is enhanced by a portion composed of only one layer of the skin side absorption layer 38. As a result, along with the elasticity of the dorsal region R of the diaper 10 described above, the liquid absorption capacity on the dorsal side, particularly in the central portion in the width direction where the liquid easily leaks, can be further increased.
Further, in this embodiment, the width, length, number, and the like of the thin-walled portion 31 are widened according to the degree of deformation of the undulating shape of the wearer's skin surface while maintaining the absorption capacity of the absorber 3. .. For example, the width, length, number, and the like of the thin-walled portions 31 can be increased on both sides of the back side portion 3R of the absorber on the outer sides in the width direction to further enhance the deformability of the outer portions on both sides. The above setting of the thin-walled portion 31 can set a desired combination of deformability and absorption capacity by varying the two-layer portion and the one-layer portion. As a result, expansion and contraction can be suppressed in the vicinity of the center of the dorsal region R of the diaper 10 in the width direction, which comes into contact with the vicinity of the spine where the undulating shape of the wearer's skin surface is less deformed, and the fit to the skin can be further maintained. Then, the diaper 10 has high elasticity on both sides in the width direction of the dorsal region R, which abuts on the soft parts of the skin from both sides of the spine to the flanks, and keeps fitting by suppressing the gap according to the change in posture. Can be done.

また、薄肉部３１が吸収体材料を有さない態様の具体例としては、図４に示すように、薄肉部３１が単層貫通孔３１Ｄからなる構成が挙げられる。これにより、吸収体背側部３Ｒの剛性が更に低下し、おむつ１０の背側領域Ｒの伸縮性が更に向上する。また、図２の態様の薄肉吸収部３１Ａが無いため、ウエストギャザー部５の収縮時に薄肉部３１の空間が狭まりやすく、厚肉部３２同士の接触がより密となって液引き込みの連携性が更に高まる。同時に薄肉部３１で狭まった空間における毛管力がより強く働き液の引き込み性を更に高める。 Further, as a specific example of the embodiment in which the thin-walled portion 31 does not have an absorber material, as shown in FIG. 4, a configuration in which the thin-walled portion 31 is composed of a single-layer through hole 31D can be mentioned. As a result, the rigidity of the dorsal portion 3R of the absorber is further reduced, and the elasticity of the dorsal region R of the diaper 10 is further improved. Further, since the thin-walled absorbing portion 31A according to the aspect of FIG. 2 is not provided, the space of the thin-walled portion 31 tends to be narrowed when the waist gathered portion 5 is contracted, and the thick-walled portions 32 are in closer contact with each other to improve the coordination of liquid drawing. Further increase. At the same time, the capillary force in the space narrowed by the thin-walled portion 31 works more strongly to further enhance the drawing property of the liquid.

薄肉部３１が吸収体材料を有さない態様の別の具体例としては、図５に示すような、２層部分を含む態様が挙げられる。この態様では、吸収体３は、肌側吸収層３８とこれよりも幅狭にされた非肌側吸収層３９との積層体からなる。
２層が重なる部分においては、薄肉部３１は、肌側吸収層３８の肌側貫通孔３１Ｃとこれに連通する非肌側吸収層３９の非肌側貫通孔３１Ｅとからなる。２層構造にいて薄肉部３１に隣接する部分が厚肉部３２となる。一方、１層（肌側吸収層３８）のみからなる両側部においては、単層貫通孔３１Ｄと厚肉部３２とを有する。
この態様では、２層の液吸収容量を保持しつつ、２つの貫通孔の連通により吸収体背側部３Ｒの剛性が更に低下する。これにより、おむつ１０の背側領域Ｒにおける前述した作用がより優れたものとなる。
加えて、この態様において、非肌側貫通孔３１Ｅの幅（幅方向の長さ）Ｌ２が、肌側貫通孔３１Ｄの幅（幅方向の長さ）Ｌ１よりも広いことが好ましい。これにより、装着時のおむつ１０の伸縮において、肌側貫通孔３１Ｄと非肌側貫通孔３１Ｅとの重なりが残りやすい。これにより種々の装着状態にあっても吸収体３全体の伸縮がしやすい。加えて、肌側吸収層３８から非肌側吸収層３９の非肌側貫通孔３１Ｅで液を広げやすく吸収速度を向上することができる。また、肌側貫通孔３１Ｄよりも外周に位置する非肌側貫通孔３１Ｅの可撓域を広げて、外側のウエストギャザー部５が伸縮しやすくなり、おむつ１０の背側領域Ｒの伸縮性を更に高める。一方、肌側貫通孔３１Ｄはウエストギャザー部５の収縮で空間が狭まりやすく厚肉部３２同士の密着性が高まって、液の引き込み性が更に向上する。このように図５の態様では、液の引き込み性（吸収性能）とフィット性とを更に向上させることができる。 As another specific example of the embodiment in which the thin-walled portion 31 does not have the absorber material, there is an embodiment including a two-layer portion as shown in FIG. In this aspect, the absorber 3 is composed of a laminate of a skin-side absorbing layer 38 and a non-skin-side absorbing layer 39 narrower than the skin-side absorbing layer 38.
In the portion where the two layers overlap, the thin-walled portion 31 includes a skin-side through hole 31C of the skin-side absorption layer 38 and a non-skin-side through hole 31E of the non-skin-side absorption layer 39 communicating with the skin-side through hole 31C. The portion of the two-layer structure adjacent to the thin portion 31 is the thick portion 32. On the other hand, both side portions composed of only one layer (skin side absorption layer 38) have a single layer through hole 31D and a thick portion 32.
In this aspect, the rigidity of the dorsal portion 3R of the absorber is further reduced by the communication of the two through holes while maintaining the liquid absorption capacity of the two layers. As a result, the above-mentioned action in the dorsal region R of the diaper 10 becomes more excellent.
In addition, in this embodiment, it is preferable that the width (length in the width direction) L2 of the non-skin side through hole 31E is wider than the width (length in the width direction) L1 of the skin side through hole 31D. As a result, when the diaper 10 is expanded and contracted when worn, the skin-side through-hole 31D and the non-skin-side through-hole 31E tend to remain overlapped. As a result, the entire absorber 3 can easily expand and contract even in various mounting states. In addition, the non-skin side through hole 31E from the skin side absorption layer 38 to the non-skin side absorption layer 39 can easily spread the liquid and improve the absorption rate. Further, the flexible region of the non-skin side through hole 31E located on the outer periphery of the skin side through hole 31D is widened, the outer waist gather portion 5 is easily expanded and contracted, and the elasticity of the dorsal region R of the diaper 10 is increased. Further enhance. On the other hand, the space of the skin-side through hole 31D tends to be narrowed due to the contraction of the waist gather portion 5, and the adhesion between the thick portions 32 is enhanced, so that the liquid drawing property is further improved. As described above, in the aspect of FIG. 5, the liquid drawing property (absorption performance) and the fit property can be further improved.

本実施形態のおむつ１０において、薄肉部３１は上記の具体例に限定されず、該具体例以外の、周囲よりも目付が小さく上記の作用を奏する態様を種々含み得る。薄肉部３１がいずれの態様であっても、図３の態様において説明したように、着用者の肌表面の起伏形状の変形の程度に合わせて、薄肉部３１の形状や配置を設定することが好ましい。 In the diaper 10 of the present embodiment, the thin-walled portion 31 is not limited to the above-mentioned specific example, and may include various aspects other than the above-mentioned specific example, which have a smaller basis weight than the surroundings and exert the above-mentioned action. Regardless of the mode of the thin-walled portion 31, the shape and arrangement of the thin-walled portion 31 can be set according to the degree of deformation of the undulating shape of the skin surface of the wearer as described in the aspect of FIG. preferable.

例えば、図１に示すように、着用者の背骨に対応する、吸収体背側部３Ｒの幅方向中央部分には薄肉部３１を配さず厚肉部３２（３２Ａ）を配することが好ましい。なお、この厚肉部３２Ａは、図１に一点鎖線で示す幅方向中心線Ｔから左右に所定幅を有する部分である。この場合、厚肉部３２Ａの両脇から幅方向外方に向けて薄肉部３１を複数配することとなる。これにより、着用者の肌表面の起伏形状の変形の少ない背骨付近には吸収力の高い厚肉部３２Ａがフィットし続け、背骨を伝う液に対する吸収性を高めて液漏れを抑える。一方、着用者の肌表面の起伏形状の変形の大きな背骨の両脇から脇腹に至る柔らかい部分には、複数の薄肉部３１が変形しながら吸収体３の厚肉部３２が肌に追従してフィットし続ける。これにより、腰回りのフィット性が高まり、液漏れ防止性が高まる。このような配置は、特に、尿とりパッドを併用する大人用おむつを使用した着用者の就寝中において、液漏れ防止に効果的である。すなわち、背中中央に位置する厚肉部３２Ａによって、尿とりパッドからこぼれた尿を吸収し、背中からの漏れを防止することができる。しかも、着用者の僅かな動きにも追従してわき腹付近でも隙間が生じ難く、漏れが効果的に防止される。 For example, as shown in FIG. 1, it is preferable that the thick portion 32 (32A) is arranged instead of the thin portion 31 in the central portion in the width direction of the back side portion 3R of the absorber corresponding to the spine of the wearer. .. The thick portion 32A is a portion having a predetermined width to the left and right from the width direction center line T shown by the alternate long and short dash line in FIG. In this case, a plurality of thin-walled portions 31 are arranged from both sides of the thick-walled portion 32A toward the outside in the width direction. As a result, the thick portion 32A having high absorbency continues to fit in the vicinity of the spine where the undulating shape of the wearer's skin surface is less deformed, and the absorption of the liquid flowing through the spine is enhanced to suppress liquid leakage. On the other hand, in the soft portion from both sides of the spine where the undulating shape of the wearer's skin surface is greatly deformed to the flank, the thick portion 32 of the absorber 3 follows the skin while the plurality of thin portion 31 is deformed. Keep fitting. As a result, the fit around the waist is improved and the liquid leakage prevention property is improved. Such an arrangement is particularly effective in preventing liquid leakage during bedtime of a wearer who uses an adult diaper that also uses a urine absorbing pad. That is, the thick portion 32A located in the center of the back can absorb the urine spilled from the urine collecting pad and prevent leakage from the back. Moreover, it is difficult for a gap to be formed even in the vicinity of the flank following a slight movement of the wearer, and leakage is effectively prevented.

背骨付近に対応する厚肉部３２Ａの幅（幅方向の長さ）Ｋの（図６参照）、吸収体背側部３Ｒの背側端部３５の幅（幅方向の長さ）に対する比は、着用者の背骨への密着性及び漏れ防止性の観点から、０．１５以上が好ましく、０．１８以上がより好ましく、０．２０以上が更に好ましい。また、前記比は、着用者の背骨両脇の柔らかい部分へのフィット性及び追従性を確保する観点から、０．５５以下が好ましく、０．５０以下がより好ましく、０．４５以下が更に好ましい。 The ratio of the width (length in the width direction) K (see FIG. 6) of the thick portion 32A corresponding to the vicinity of the spine to the width (length in the width direction) of the dorsal end 35 of the dorsal part 3R of the absorber is From the viewpoint of adhesion to the wearer's spine and leakage prevention, 0.15 or more is preferable, 0.18 or more is more preferable, and 0.20 or more is further preferable. Further, the ratio is preferably 0.55 or less, more preferably 0.50 or less, still more preferably 0.45 or less, from the viewpoint of ensuring the fit and followability to the soft portions on both sides of the wearer's spine. ..

また、上記と同様の理由により、薄肉部３１同士の間隔（ピッチ）や各薄肉部３１の幅（幅方向長さ）全体を、吸収体背側部３Ｒの幅方向中央部分と両側外方部分とで異ならせてもよい。ここでいう薄肉部３１同士の間隔（ピッチ）とは、薄肉部３１の両側縁３１７、３１７の背側端部３１８、３１８間の中心点３１Ｍと隣り合う他の薄肉部３１の中心点３１Ｍとの間の距離Ｗである（図６参照）。薄肉部３１の幅とは、両側縁３１７、３１７の背側端部３１８、３１８間の長さＨである。
例えば、薄肉部３１同士の間隔（ピッチ）を異ならせる態様としては、図７（Ａ）に示すように、幅方向中央側の間隔Ｗ１よりも幅方向外方側の間隔Ｗ２を相対的に狭めることが挙げられる。全体配置としては、例えば図８（Ａ）のように、幅方向中心線Ｔから幅方向外方に行くにつれ複数の薄肉部３１同士の間隔が狭くなる態様が挙げられる。この場合、間隔の違いにより、幅方向中央側の薄肉部３１の本数より、幅方向外方側の薄肉部３１の本数が多くなる。これにより、両側外方に行くほど吸収体３及びウエストギャザー部５は細かく小刻みに伸縮し、着用者の肌表面の起伏に対して隙間の発生を抑制しやすくなる。
また、例えば、各薄肉部３１の幅（幅方向長さ）を異ならせる態様としては、図７（Ｂ）に示すように、幅方向中央側の幅Ｈ１よりも幅方向外方側の幅Ｈ２を相対的に広くすることが挙げられる。全体配置としては、例えば図８（Ｂ）のように、幅方向中心線Ｔから幅方向外方に行くにつれ各薄肉部３１の幅が広くなっている態様が挙げられる。この場合、両側外方に行くほど伸縮が大きく着用者の肌表面の起伏形状の大きな変形にも対応できるものとなる。
さらに、図８（Ｃ）の態様のように、図８（Ａ）及び図８（Ｂ）の態様を合わせたものであってもよい。 Further, for the same reason as described above, the distance (pitch) between the thin-walled portions 31 and the entire width (length in the width direction) of each thin-walled portion 31 are set to the central portion in the width direction and the outer portions on both sides of the back side portion 3R of the absorber. It may be different from. The distance (pitch) between the thin-walled portions 31 referred to here is the center point 31M between the dorsal end portions 318 and 318 of the side edges 317 and 317 of the thin-walled portion 31 and the center point 31M of the other thin-walled portions 31 adjacent to each other. The distance W between them (see FIG. 6). The width of the thin portion 31 is the length H between the dorsal end portions 318 and 318 of the side edges 317 and 317.
For example, as a mode in which the intervals (pitch) between the thin-walled portions 31 are different, as shown in FIG. 7A, the interval W2 on the outer side in the width direction is relatively narrower than the interval W1 on the central side in the width direction. Can be mentioned. As the overall arrangement, for example, as shown in FIG. 8A, the distance between the plurality of thin-walled portions 31 becomes narrower from the center line T in the width direction toward the outside in the width direction. In this case, the number of thin-walled portions 31 on the outer side in the width direction is larger than the number of thin-walled portions 31 on the central side in the width direction due to the difference in spacing. As a result, the absorber 3 and the waist gather portion 5 expand and contract in small steps toward the outside on both sides, and it becomes easier to suppress the occurrence of gaps with respect to the undulations of the wearer's skin surface.
Further, for example, as a mode in which the width (length in the width direction) of each thin-walled portion 31 is different, as shown in FIG. 7B, the width H2 on the outer side in the width direction is larger than the width H1 on the center side in the width direction. Is relatively wide. As the overall arrangement, for example, as shown in FIG. 8B, the width of each thin-walled portion 31 increases from the center line T in the width direction to the outside in the width direction. In this case, the expansion and contraction increases toward the outside on both sides, and it is possible to cope with a large deformation of the undulating shape of the wearer's skin surface.
Further, the aspects of FIGS. 8 (A) and 8 (B) may be combined as in the embodiment of FIG. 8 (C).

加えて、図８（Ｄ）の態様のように、薄肉部３１の長手方向の長さＭを、幅方向中央側より幅方向外方側で長くするようにしてもよい。これにより、中央側から両側外方側に行くほど吸収体背側部３Ｒは大きく変形しやすく、おむつ１０の背側領域Ｒの伸縮性が高まる。 In addition, as in the aspect of FIG. 8D, the length M in the longitudinal direction of the thin wall portion 31 may be made longer on the outer side in the width direction than on the central side in the width direction. As a result, the dorsal portion 3R of the absorber is greatly deformed from the central side to the outer side on both sides, and the elasticity of the dorsal region R of the diaper 10 is increased.

なお、各薄肉部３１の長手方向の腹側端部は、吸収体３の股下領域Ｃまでには至らず、背側領域Ｒの範囲内に収まる長さであることが好ましい。これにより、股下領域Ｃから直接的に背側部領域Ｃに液が流れるのを防止することができる。 It is preferable that the ventral end of each thin portion 31 in the longitudinal direction has a length that does not reach the inseam region C of the absorber 3 and falls within the range of the dorsal region R. This makes it possible to prevent the liquid from flowing directly from the inseam region C to the dorsal region C.

さらに、各薄肉部３１の長手方向の腹側端部は、ウエストギャザー部５の腹側端部よりも腹側に延出していることが好ましい。このように吸収体背側部３Ｒの変形部をウエストギャザー部５よりも長くとることで、ウエストギャザー部５の伸縮性が吸収体背側部３Ｒで制限されないようにすることができる。 Further, it is preferable that the ventral end portion of each thin-walled portion 31 in the longitudinal direction extends ventral to the ventral end portion of the waist gather portion 5. By making the deformed portion of the back side portion 3R of the absorber longer than the waist gather portion 5 in this way, the elasticity of the waist gather portion 5 can be prevented from being restricted by the back side portion 3R of the absorber.

本実施形態において、薄肉部３１は幅方向に幅（両側縁３１７、３１７の背側端部３１８、３１８間の長さＨ）があるため、幅の無いスリットと異なり、収縮しやすく、前述した作用の観点から好ましい。この幅は、おむつの大きさや用途によっても異なるため一概に定めることはできない。大人用おむつの場合、柔軟性と伸縮性の観点から、薄肉部３１の幅Ｈは、５ｍｍ以上が好ましく、８ｍｍ以上がより好ましく、１０ｍｍ以上が更に好ましい。また、前記幅Ｈは、腰回りのフィット性とモレ防止の観点から、４０ｍｍ以下が好ましく、３５ｍｍ以下がより好ましく、３０ｍｍ以下が更に好ましい。図７（Ｂ）に示したように幅を異ならせる場合においても上記の範囲で設定されることが好ましい。
また、吸収体３の背側端部３５の幅（幅方向の長さ）全体に対する、各薄肉部３１の幅（幅方向の長さＨ）の合計幅の比は、装着時のフィット性と伸縮長の可動量の観点から、０．１０以上が好ましく、０．１５以上がより好ましく、０．１８以上が更に好ましい。また、前記比は、紙おむつ装着時のあてやすさを妨げないよう過度の伸縮長を抑えこと、さらに背側端部での吸収性を維持する観点から、０．４５以下が好ましく、０．４０以下がより好ましく、０．３７以下が更に好ましい。
さらに、吸収体３の長手方向の長さの３分の１に対する、各薄肉部３１の長手方向の長さの比は、吸収体背側部におけるフィット性を保ちかつ吸収体背側部で吸収される尿を吸収体の中央部側に引き込み性を維持する観点から、０．１５以上が好ましく、０．１８以上がより好ましく、０．２０以上が更に好ましい。また、前記比は、吸収体股下部から背側部への液の拡散を防止することと股下部での吸収体のヨレ・壊れを防止する観点から、０．９０以下が好ましく、０．８５以下がより好ましく、０．８０以下が更に好ましい。
加えて、各薄肉部３１の長手方向の長さにおける、ウエストギャザー部５が重なる長手方向の長さの割合は、薄肉部３１の伸縮性を効果的に保つ観点から、０．２５以上が好ましく、０．３０以上がより好ましく、０．３５以上が更に好ましい。また、前記比は、薄肉部３１の股下側の長さを大きく超えると薄肉部でない吸収体がギャザーの伸縮によって縮シワが発生しやすく違和感の発生を防止する観点から、０．９０以下が好ましく、０．８５以下がより好ましく、０．８０以下が更に好ましい。
また、吸収体背側部３Ｒにおいて、薄肉部３１が幅方向に複数並ぶ領域（薄肉部３１及び厚肉部３２を併せた幅方向の領域）全体における吸収体材料の目付は、液吸収容量の確保の観点から、１５０ｇ／ｍ^２以上が好ましく、２００ｇ／ｍ^２以上がより好ましく、２４０ｇ／ｍ^２以上が更に好ましい。また、前記目付は、フィット性と柔軟性の観点から、８００ｇ／ｍ^２以下が好ましく、７５０ｇ／ｍ^２以下がより好ましく、７００ｇ／ｍ^２以下が更に好ましい。 In the present embodiment, since the thin-walled portion 31 has a width in the width direction (length H between the dorsal end portions 318 and 318 of both side edges 317 and 317), unlike a slit having no width, it easily shrinks, as described above. It is preferable from the viewpoint of action. This width cannot be unequivocally determined because it varies depending on the size and use of the diaper. In the case of adult diapers, the width H of the thin portion 31 is preferably 5 mm or more, more preferably 8 mm or more, still more preferably 10 mm or more, from the viewpoint of flexibility and elasticity. Further, the width H is preferably 40 mm or less, more preferably 35 mm or less, still more preferably 30 mm or less, from the viewpoint of fit around the waist and prevention of leakage. Even when the widths are different as shown in FIG. 7B, it is preferable that the widths are set within the above range.
Further, the ratio of the total width of the width (length H in the width direction) of each thin wall portion 31 to the entire width (length in the width direction) of the dorsal end portion 35 of the absorber 3 is the fit at the time of mounting. From the viewpoint of the amount of movement of the expansion and contraction length, 0.10 or more is preferable, 0.15 or more is more preferable, and 0.18 or more is further preferable. Further, the ratio is preferably 0.45 or less, preferably 0.40 or less, from the viewpoint of suppressing an excessive expansion / contraction length so as not to interfere with the ease of applying the disposable diaper and maintaining the absorbability at the dorsal end. The following is more preferable, and 0.37 or less is further preferable.
Further, the ratio of the longitudinal length of each thin portion 31 to one-third of the longitudinal length of the absorber 3 maintains the fit on the dorsal side of the absorber and absorbs on the dorsal side of the absorber. From the viewpoint of maintaining the attraction of the urine to the central portion of the absorber, 0.15 or more is preferable, 0.18 or more is more preferable, and 0.20 or more is further preferable. The ratio is preferably 0.90 or less, preferably 0.85 or less, from the viewpoint of preventing the diffusion of the liquid from the lower part of the crotch of the absorber to the dorsal side and preventing the absorber from twisting or breaking at the lower part of the crotch. The following is more preferable, and 0.80 or less is further preferable.
In addition, the ratio of the length in the longitudinal direction in which the waist gather portions 5 overlap to the length in the longitudinal direction of each thin-walled portion 31 is preferably 0.25 or more from the viewpoint of effectively maintaining the elasticity of the thin-walled portion 31. , 0.30 or more is more preferable, and 0.35 or more is further preferable. Further, the ratio is preferably 0.90 or less from the viewpoint that when the length of the inseam side of the thin-walled portion 31 is greatly exceeded, the absorber that is not the thin-walled portion tends to cause shrinkage wrinkles due to the expansion and contraction of gathers and prevents the occurrence of discomfort. , 0.85 or less is more preferable, and 0.80 or less is further preferable.
Further, in the back side portion 3R of the absorber, the basis weight of the absorber material in the entire region where a plurality of thin-walled portions 31 are arranged in the width direction (region in the width direction in which the thin-walled portion 31 and the thick-walled portion 32 are combined) is the liquid absorption capacity. From the viewpoint of securing, 150 g / m ² or more is preferable, 200 g / m ² or more is more preferable, and 240 g / m ² or more is further preferable. Also, the basis weight, in terms of fit and flexibility, preferably 800 g / ^{m 2} or less, more preferably 750 g / ^{m 2} or less, 700 g / ^{m 2} or less is more preferable.

薄肉部３１は、前述のとおり、吸収体材料の目付が他よりも小さいことで可撓部としての変形性を有する。この変形性の観点から、薄肉部３１が薄肉吸収部３１Ａを有する場合、薄肉吸収部３１Ａは圧縮されたエンボス部でないことが好ましい。すなわち、薄肉吸収部３１Ａが他の部分に比して高密度でないことが、言い換えれば、薄肉吸収部３１Ａが他の部分に比して低密度であることが好ましい。薄肉吸収部３１Ａが高密度なエンボス部であると、薄肉部３１の剛性が高まり変形性が低減しかねない。そのため、薄肉部３１はエンボス部（高密度部）でないことが好ましい。ただし、可撓性を阻害しない程度に部分的なエンボス部を含んでもよい。
また、同様の観点から、薄肉部３１が前述の貫通孔３１Ｃ〜Ｅの少なくともいずれか１つを有する場合、該貫通孔が吸収体３の打ち抜き部でないことが好ましい。吸収体材料が積繊されずに残った空間部分であることが好ましい。貫通孔が打ち抜き部であると、貫通孔の隣接壁面が他の部分よりも高密度となって剛性が高まり、薄肉部３１の変形性が低減しかねない。そのため、貫通孔が吸収体３の打ち抜き部でなく、貫通孔の隣接壁面の他の部分よりも高密度でないことが好ましい。
さらに、吸収体３が吸収体材料の積繊体とこれを被覆するコアラップシートからなる場合、壊れやヨレを防止するため、薄肉部３１とコアラップシートとを接合する接着剤の坪量は、股下部における吸収体材料とコアラップシートとを接合する接着剤の坪量より多く、かつ、接着面積が大きいことが好ましい。例えば、接着剤の塗工方法は、スパイラルスブレーに加えて、コーターを用いてストライプ状に塗布することができる。 As described above, the thin-walled portion 31 has a deformability as a flexible portion because the basis weight of the absorber material is smaller than the others. From the viewpoint of this deformability, when the thin-walled portion 31 has the thin-walled absorbing portion 31A, it is preferable that the thin-walled absorbing portion 31A is not a compressed embossed portion. That is, it is preferable that the thin-walled absorbing portion 31A has a lower density than the other portions, in other words, the thin-walled absorbing portion 31A has a lower density than the other portions. If the thin-walled absorbing portion 31A is a high-density embossed portion, the rigidity of the thin-walled portion 31 may increase and the deformability may decrease. Therefore, it is preferable that the thin-walled portion 31 is not an embossed portion (high-density portion). However, a partially embossed portion may be included to the extent that the flexibility is not impaired.
Further, from the same viewpoint, when the thin-walled portion 31 has at least one of the above-mentioned through holes 31C to E, it is preferable that the through hole is not a punched portion of the absorber 3. It is preferable that the absorber material is a space portion remaining without being stacked. When the through hole is a punched portion, the adjacent wall surface of the through hole becomes denser than other portions, the rigidity is increased, and the deformability of the thin portion 31 may be reduced. Therefore, it is preferable that the through hole is not a punched portion of the absorber 3 and has a lower density than other portions of the adjacent wall surface of the through hole.
Further, when the absorber 3 is composed of a fiber stack of the absorber material and a core wrap sheet covering the absorbent body 3, the basis weight of the adhesive for joining the thin portion 31 and the core wrap sheet is increased in order to prevent breakage and twisting. , It is preferable that the basis weight of the adhesive for joining the absorber material and the core wrap sheet in the crotch portion is larger than the basis weight and the adhesive area is large. For example, the adhesive coating method can be applied in a striped manner using a coater in addition to the spiral slab.

また、薄肉部３１は、吸収体材料の目付が他よりも小さくされた部分であれば、吸収体３としての厚みが変わらない態様であってもよい。例えば、前述したように、凹部３１Ｂが無く、単に密度が疎な状態の態様が挙げられる。その他、吸収体３が吸収体材料の積繊体とこれを被覆するコアラップシートからなる場合（図示せず）、薄肉部３１における吸収体材料の積繊体のみが窪んでコアラップシートが窪まない態様でもよい。該コアラップシートにより、吸収体３の肌当接面側が表面シート１と面状に接して液を吸収体３内部へと引き込みやすくなり好ましい。コアラップシートは、親水性のシートであることが好ましく、薄葉紙（テッシュ）や親水性不織布等のおむつ用材料として使用されているものを用いることができる。 Further, the thin-walled portion 31 may have a mode in which the thickness of the absorber 3 does not change as long as the basis weight of the absorber material is smaller than the others. For example, as described above, there is no recess 31B, and the density is simply sparse. In addition, when the absorber 3 is composed of a fiber stack of the absorber material and a core wrap sheet covering the fiber (not shown), only the fiber stack of the absorber material in the thin portion 31 is dented and the core wrap sheet is dented. It may not be in the form. The core wrap sheet is preferable because the skin contact surface side of the absorber 3 comes into surface contact with the surface sheet 1 and the liquid can be easily drawn into the absorber 3. The core wrap sheet is preferably a hydrophilic sheet, and those used as diaper materials such as thin paper (tissue) and hydrophilic non-woven fabric can be used.

薄肉部３１の変形（吸収体３の伸縮）のは、ウエストギャザー部５の伸縮に伴って生じるものである。ウエストギャザー部５は、おむつ装着時に、左右一対のファスニングテープ１８、１８の幅方向外方（図１の矢印Ｘ３、Ｘ３で示す方向）への引張力が伝搬して伸長する。これによりおむつ１０は、装着時に着用者の腰回りの肌にフィットする。ファイスニングテープ１８の引張力の効果的な伝搬の観点から、ファスニングテープ１８を固定するテープ基部１９は、ウエストギャザー部５と、おむつ１０の長手方向において重なる配置であることが好ましい。さらに、テープ基部１９の腹側端部は、ウエストギャザー部５の腹側端部よりも腹側に延出していることがより好ましい。腹側への延出によって、テープ基部１９の、ウエストギャザー部５より腹側に位置する部分を非伸縮の基底部として、おむつ１０の背側領域Ｒを扇状に広げることができる。同時に、前述した幅方向に複数並ぶ薄肉部３１の変形により吸収体背側部３Ｒが扇状に広がる。これにより、おむつ１０の装着時、吸収体背側部３Ｒを含めたおむつ１０の背側領域Ｒの肌へのフィット性が高まる。さらに、その際、おむつ１０の股下領域Ｃは必要以上に変形し難くなり着用者の股下への装着性が向上する。特に、尿とりパッドとの併用の場合、表面シート１上に載置した尿とりパッドの位置ズレが生じ難く装着性が向上する。 The deformation of the thin-walled portion 31 (expansion and contraction of the absorber 3) occurs with the expansion and contraction of the waist gather portion 5. When the diaper is worn, the waist gather portion 5 is extended by propagating a tensile force outward in the width direction (directions indicated by arrows X3 and X3 in FIG. 1) of the pair of left and right fastening tapes 18 and 18. As a result, the diaper 10 fits the skin around the wearer's waist when worn. From the viewpoint of effective propagation of the tensile force of the fastening tape 18, the tape base 19 for fixing the fastening tape 18 is preferably arranged so as to overlap the waist gather portion 5 in the longitudinal direction of the diaper 10. Further, it is more preferable that the ventral end of the tape base 19 extends ventral to the ventral end of the waist gather portion 5. By extending to the ventral side, the dorsal region R of the diaper 10 can be fan-shaped, with the portion of the tape base 19 located ventral to the waist gather portion 5 as the non-stretchable base portion. At the same time, the back side portion 3R of the absorber expands in a fan shape due to the deformation of the plurality of thin-walled portions 31 arranged in the width direction described above. As a result, when the diaper 10 is worn, the fit of the dorsal region R of the diaper 10 including the dorsal portion 3R of the absorber to the skin is enhanced. Further, at that time, the inseam region C of the diaper 10 is less likely to be deformed more than necessary, and the wearability to the inseam of the wearer is improved. In particular, when used in combination with a urine absorbing pad, the urine absorbing pad placed on the surface sheet 1 is less likely to be displaced and the wearability is improved.

また、ウエストギャザー部５の弾性部材５１は、厚み方向において吸収体３と裏面シート２との間にあることが好ましい。これにより、弾性部材の伸縮力が、吸収体３の薄肉部３１に直接的に伝搬しやすくなり、吸収体３の変形性と吸収体３の肌へのフィット性を高めることができる。 Further, the elastic member 51 of the waist gather portion 5 is preferably located between the absorber 3 and the back surface sheet 2 in the thickness direction. As a result, the elastic force of the elastic member can be easily propagated directly to the thin portion 31 of the absorber 3, and the deformability of the absorber 3 and the fit of the absorber 3 to the skin can be enhanced.

加えて、ウエストギャザー部５は、幅方向に並ぶ複数の薄肉部３１よりも幅方向外方に延出していることが好ましい。これにより、薄肉部３１及び厚肉部３２を含めた吸収体背側部３Ｒ全体を伸縮させることができる。 In addition, the waist gather portion 5 preferably extends outward in the width direction rather than the plurality of thin-walled portions 31 arranged in the width direction. As a result, the entire dorsal portion 3R of the absorber including the thin-walled portion 31 and the thick-walled portion 32 can be expanded and contracted.

さらに、ウエストギャザー部５は、薄肉部３１と重なる位置から、吸収体背側部３Ｒよりも長手方向外方まで延出していることが好ましい。これにより、ウエストギャザー部５は、吸収体３と、吸収体３の剛性が無いシート積層領域（吸収体３の介在しない、表面シート１、裏面シート２及びサイドシート４の積層領域）Ｒ１とを一体的に伸縮させることができる。これにより、おむつ１０の背側領域Ｒ全体の肌へのフィット性が更に高まる。 Further, it is preferable that the waist gather portion 5 extends outward in the longitudinal direction from the position where it overlaps with the thin-walled portion 31 to the back side portion 3R of the absorber. As a result, the waist gather portion 5 provides the absorber 3 and the non-rigid sheet laminated region (the laminated region of the front sheet 1, the back sheet 2 and the side sheet 4 without the absorber 3 intervening) R1. It can be expanded and contracted integrally. As a result, the fit of the entire dorsal region R of the diaper 10 to the skin is further enhanced.

以上説明した、おむつ１０の背側領域Ｒにおける種々の好ましい態様は、適宜選択して組み合わせて用いることができる。 Various preferred embodiments of the dorsal region R of the diaper 10 described above can be appropriately selected and used in combination.

なお、本実施形態のおむつ１０においては、吸収体３の腹側領域Ｆの部分にも薄肉部３１が幅方向に複数並んで配されている。すなわち、おむつ１０の腹側領域Ｆにおいても前述した背側領域Ｒと同様の作用が得られ、環状の胴回り全体のフィット性、肌への追従性、液漏れ防止性が向上する。また、腹側領域Ｆの薄肉部３１においても、前述した種々の好ましい態様を任意に組み合わせて採用することができる。 In the diaper 10 of the present embodiment, a plurality of thin-walled portions 31 are arranged side by side in the width direction also in the ventral region F of the absorber 3. That is, the same effect as that of the dorsal region R described above can be obtained in the ventral region F of the diaper 10, and the fit of the entire annular waist circumference, the followability to the skin, and the liquid leakage prevention property are improved. Further, also in the thin portion 31 of the ventral region F, the above-mentioned various preferred embodiments can be arbitrarily combined and adopted.

次に、おむつ１０の構成部材について説明する。上述した表面シート１、裏面シート２、吸収体３及びサイドシート４の形成材料としては、通常の吸収性物品に使用されるものを用いることができる。
表面シート１としては、肌触りが良く液透過性の部材からなり、例えば、親水性不織布が好ましい。具体的には、エアスルー不織布、ポイントボンド不織布、スパンボンド不織布、スパンレース不織布、立体賦形不織布と呼ばれている不織布が挙げられる。その不織布の繊維は、ポリプロピレンの単繊維や、ポリプロピレンとポリエチレンの複合繊維、ポリエチレンテレフタレートとポリエチレンの複合繊維等で親水化処理が施された繊維が好ましい。また、表面シート１の股下部分には、表面シート１の非肌当接面側に親水性穴開きフィルムや親水性不織布が部分的に重ねられていてもよい。表面シート１の坪量は、１５ｇ／ｍ^２以上が好ましく、１８ｇ／ｍ^２以上がより好ましく、５０ｇ／ｍ^２以下が好ましく、４０ｇ／ｍ^２以下がより好ましい。親水性の異なる繊維を用いて、肌側の親水度が非肌側の親水度より低く、また、尿に対する毛管力が肌側表面に比べて非肌側表面が高い方が、表面側からの吸収性を高める点で好ましい。 Next, the constituent members of the diaper 10 will be described. As the material for forming the front surface sheet 1, the back surface sheet 2, the absorber 3, and the side sheet 4 described above, those used for ordinary absorbent articles can be used.
The surface sheet 1 is made of a member that is soft to the touch and permeable to liquid, and for example, a hydrophilic non-woven fabric is preferable. Specific examples thereof include air-through non-woven fabrics, point-bonded non-woven fabrics, spunbonded non-woven fabrics, spunlaced non-woven fabrics, and non-woven fabrics called three-dimensional shaped non-woven fabrics. The fibers of the non-woven fabric are preferably polypropylene single fibers, polypropylene-polyethylene composite fibers, polyethylene terephthalate-polyethylene composite fibers, or the like that have been hydrophilized. Further, a hydrophilic perforated film or a hydrophilic non-woven fabric may be partially laminated on the inseam portion of the surface sheet 1 on the non-skin contact surface side of the surface sheet 1. The basis weight of the topsheet 1 is preferably 15 g / ^{m 2} or more, 18 g / ^{m 2} or more, and preferably 50 g / ^{m 2} or less, 40 g / ^{m 2} or less is more preferable. When fibers with different hydrophilicity are used, the hydrophilicity on the skin side is lower than the hydrophilicity on the non-skin side, and the capillary force against urine is higher on the non-skin side surface than on the skin side surface, from the surface side. It is preferable in that it enhances absorbability.

裏面シート２としては、防水性があり透湿性を有していれば特に限定されない。吸収体３の非肌当接面側で液漏れを防ぐ観点から、液難透過性の部材が挙げられる。例えば疎水性の熱可塑性樹脂と、炭酸カルシウム等からなる微小な無機フィラー又は相溶性のない有機高分子等とを溶融混練してフィルムを形成し、該フィルムを一軸又は二軸延伸して得られる液不透過性の多孔性フィルムが挙げられる。前記熱可塑性樹脂としては、ポリオレフィンが挙げられる。該ポリオレフィンとしては、高密度ないし低密度ポリエチレン、線状低密度ポリエチレン、ポリプロピレン、ポリブテン等が挙げられ、これらを単独で又は混合して用いることができる。また、ムレ防止の観点から透湿性を有することが好ましい。さらに、多孔性フィルムと不織布を接着剤で貼り合わせた複合シートであることがより好ましい。 The back sheet 2 is not particularly limited as long as it is waterproof and has moisture permeability. From the viewpoint of preventing liquid leakage on the non-skin contact surface side of the absorber 3, a liquid impervious member can be mentioned. For example, a hydrophobic thermoplastic resin and a minute inorganic filler made of calcium carbonate or the like or an incompatible organic polymer are melt-kneaded to form a film, and the film is uniaxially or biaxially stretched. Examples thereof include a liquid-impermeable porous film. Examples of the thermoplastic resin include polyolefins. Examples of the polyolefin include high-density to low-density polyethylene, linear low-density polyethylene, polypropylene, polybutene and the like, and these can be used alone or in combination. Further, from the viewpoint of preventing stuffiness, it is preferable to have moisture permeability. Further, it is more preferable that the composite sheet is a porous film and a non-woven fabric bonded together with an adhesive.

吸収体３としては、液吸収性および液保持性を有するものであれば、通常吸収性物品に用いられるものを用いることができる。例えば、繊維集合体又はこれと吸水性ポリマーとを併用させたもの等が挙げられる。繊維集合体を構成する繊維としては、パルプ繊維等の親水性天然繊維や、合成繊維（好ましくは親水化処理を施したもの）等が挙げられる。パルプ繊維としては、針葉樹クラフトパルプ、広葉樹クラフトパルプ等の木材パルプや木綿パルプ、ワラパルプ等の非木材パルプ等の天然セルロース繊維などが挙げられる。その他、ポリエチレンやポリプロピレンなどのポリオフィレン系樹脂、ポリエチレンテレフタレート等のポリエステル系樹脂、ポリビニルアルコール樹脂等の合成樹脂からなる単繊維、これらの樹脂を２種以上含む複合繊維、アセテートやレーヨンなどの半合成繊維を一部に含んでもよい。目付は特に限定されないが、上述した吸収体材料全体の坪量の５０％以上９０％以下であることが好ましい。吸水性ポリマーとしては、この種の物品に通常使用されている各種のポリマー材料を用いることができる。吸水性ポリマーは、自重の１００倍以上の水または自重の２０倍以上の生理食塩水を吸収し保持し得る性能を有するような超吸収性高分子化合物であることが好ましい。吸収性ポリマーの坪量は特に限定されないが、上述した吸収体材料全体の坪量の２０％以上６０％以下であることが好ましい。
また、繊維集合体やこれと吸水性ポリマーとを併用させたものの表面をコアラップシートで被覆したものであってもよい。コアラップシートの形成材料としては、親水性のシートが挙げられる。例えば、親水性のティッシュペーパー等の薄手の紙（薄葉紙）、クレープ紙、コットンやレーヨンなどの親水性繊維からなる不織布、合成樹脂の繊維に親水化処理を施してなる不織布、例えばエアスルー不織布、ポイントボンド不織布、スパンレース不織布、スパンボンド不織布、スパンボンド−メルトブローン−スパンボンド（ＳＭＳ）不織布等からなるものを用いることができる。 As the absorber 3, as long as it has liquid absorbency and liquid retention, those usually used for absorbent articles can be used. For example, a fiber aggregate or a combination thereof with a water-absorbing polymer may be mentioned. Examples of the fibers constituting the fiber aggregate include hydrophilic natural fibers such as pulp fibers and synthetic fibers (preferably those subjected to hydrophilic treatment). Examples of the pulp fiber include wood pulp such as coniferous kraft pulp and broadleaf kraft pulp, and natural cellulose fiber such as non-wood pulp such as cotton pulp and straw pulp. In addition, monofibers made of polyofylene-based resins such as polyethylene and polypropylene, polyester-based resins such as polyethylene terephthalate, and synthetic resins such as polyvinyl alcohol resin, composite fibers containing two or more of these resins, and semi-synthetic fibers such as acetate and rayon. The fiber may be partially contained. The basis weight is not particularly limited, but it is preferably 50% or more and 90% or less of the basis weight of the entire absorber material described above. As the water-absorbent polymer, various polymer materials usually used for this kind of article can be used. The water-absorbent polymer is preferably a superabsorbent polymer compound having the ability to absorb and retain water having a weight of 100 times or more or physiological saline having a weight of 20 times or more. The basis weight of the absorbent polymer is not particularly limited, but is preferably 20% or more and 60% or less of the basis weight of the entire absorbent material described above.
Further, the surface of the fiber aggregate or a combination of the fiber aggregate and the water-absorbent polymer may be coated with a core wrap sheet. Examples of the material for forming the core wrap sheet include a hydrophilic sheet. For example, thin paper (thin leaf paper) such as hydrophilic tissue paper, crepe paper, non-woven fabric made of hydrophilic fibers such as cotton and rayon, non-woven fabric made by hydrophilizing synthetic resin fibers, for example, air-through non-woven fabric, points. A non-woven fabric made of a bonded non-woven fabric, a spunlaced non-woven fabric, a spunbond non-woven fabric, a spunbond-melt blown-spunbond (SMS) non-woven fabric and the like can be used.

サイドシート４としては、撥水性不織布が好ましい。例えば、スパンボンド−メルトブローン−スパンボンド積層不織布（ＳＭＳ不織布）、スパンボンド−メルトブローン−メルトブローン−スパンボンド不織布（ＳＭＭＳ不織布）等の耐水性の高い撥水性の不織布が挙げられる。また、スパンボンド不織布、スパンボンド不織布等の不織布と透湿性または非透湿性の樹脂フィルムとの積層体、等が挙げられる。 As the side sheet 4, a water-repellent non-woven fabric is preferable. Examples thereof include water-repellent non-woven fabrics having high water resistance such as spunbond-melt blown-spanbond laminated non-woven fabric (SMS non-woven fabric) and spunbond-melt blown-melt blown-spunbond non-woven fabric (SMMS non-woven fabric). Further, a laminate of a non-woven fabric such as a spunbonded non-woven fabric and a spunbonded non-woven fabric and a moisture-permeable or non-breathable resin film can be mentioned.

ウエストギャザー部５を構成する弾性部材５１としては、弾性を有するものであれば、吸収性物品に使用されるものを特に制限なく採用できる。例えば、前述のとおり、複数の糸状部材からなるものでもよく、シート状のものでもよい。また、裏面シート自体を伸縮性のシートで構成するようにしてもよい。例えば、スチレン−ブタジエン、ブタジエン、イソプレン、ネオプレン等の合成ゴム、天然ゴム、エチレン酢酸ビニル（ＥＶＡ）、伸縮性ポリオレフィン、ポリウレタン等を挙げることができる。弾性部材の形態としては、断面が矩形、正方形、円形、楕円形又は多角形状等の糸状（糸ゴム等）のもの、もしくは紐状（平ゴム等）のもの、またはマルチフィラメントタイプの糸状のもの等を好ましく用いることができる。シート状のものとしては、エチレン酢酸ビニル（ＥＶＡ）フィルム、伸縮性ポリオレフィンフィルム、ポリウレタンフィルム等を好ましく用いることができる。 As the elastic member 51 constituting the waist gather portion 5, as long as it has elasticity, those used for absorbent articles can be adopted without particular limitation. For example, as described above, it may be composed of a plurality of thread-like members or may be a sheet-like member. Further, the back surface sheet itself may be composed of an elastic sheet. For example, synthetic rubber such as styrene-butadiene, butadiene, isoprene, neoprene, natural rubber, ethylene vinyl acetate (EVA), stretchable polyolefin, polyurethane and the like can be mentioned. The form of the elastic member is a thread-like (thread rubber, etc.), a string-like (flat rubber, etc.), or a multifilament type thread-like having a rectangular, square, circular, oval, or polygonal cross section. Etc. can be preferably used. As the sheet-like film, ethylene vinyl acetate (EVA) film, stretchable polyolefin film, polyurethane film and the like can be preferably used.

さらに、おむつ１０において、ウエストギャザー部５で用いる糸状の弾性部材を用いて、レックギャザー、サイドシート自由端に立体ギャザーを配置してもよい。 Further, in the diaper 10, a three-dimensional gather may be arranged at the free end of the REC gather and the side sheet by using the thread-like elastic member used in the waist gather portion 5.

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、本発明は前記実施形態に制限されない。ウエストギャザー部５及び薄肉部３１の構成を有するものであれば、上記以外の部材構成を有する形態であってもよい。 Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above embodiment. As long as it has the structure of the waist gather portion 5 and the thin wall portion 31, it may have a member structure other than the above.

本発明の吸収性物品は、着用者の腰回りに固定して装着するものであれば、前記実施形態のテープ型おむつ以外にも適用できる。例えば、パンツ型おむつやショーツ型ナプキンなどであってもよい。 The absorbent article of the present invention can be applied to other than the tape-type diaper of the above-described embodiment as long as it is fixedly worn around the wearer's waist. For example, it may be a pants-type diaper or a shorts-type napkin.

１表面シート
２裏面シート
３吸収体
３１薄肉部
３１Ａ薄肉吸収部
３１Ｂ凹部
３１Ｃ肌側貫通孔
３１Ｄ単層貫通孔
３１Ｅ非肌側貫通孔
３１７薄肉部の側縁
３１８薄肉部の側縁の背側端部
３２厚肉部
３５吸収体の背側端部
３８肌側吸収層
３９非肌側吸収層
３Ｒ吸収体背側部
４サイドシート
５ウエストギャザー部
５１弾性部材
１０テープ型おむつ
１７フラップ部
１７Ｆ腹側フラップ部
１７Ｒ背側フラップ部
１８ファスニングテープ
１９テープ基部 1 Front sheet 2 Back sheet 3 Absorber 31 Thin-walled part 31A Thin-walled absorbent part 31B Recess 31C Skin-side through hole 31D Single-layer through-hole 31E Non-skin-side through-hole 317 Side edge of thin-walled part 318 Dorsal edge of side edge of thin-walled part Part 32 Thick part 35 Dorsal end of absorber 38 Skin side absorbent layer 39 Non-skin side absorbent layer 3R Absorber dorsal part 4 Side sheet 5 Waist gather part 51 Elastic member 10 Tape type diaper 17 Flap part 17F Ventral side Flap 17R Dorsal flap 18 Fastening tape 19 Tape base

Claims

肌当接面側の表面シート、非肌当接面側の裏面シート、及び両シート間の吸収体を備え、着用者の腹側に配される腹側領域、股下に配される股下領域、及び背側に配される背側領域に区分される長手方向と、該長手方向に直交する幅方向とを有する吸収性物品であって、
前記吸収体は、該吸収体の背側端部から腹側に延びる、周囲よりも吸収体材料の目付が小さい薄肉部を有し、
前記吸収体の背側端部の幅方向中央部分には、前記薄肉部は配されず、該薄肉部よりも吸収体材料の目付が大きい厚肉部が配され、該厚肉部の両脇から幅方向外方において前記薄肉部が幅方向に複数並んでおり、
前記薄肉部と長手方向において重なる位置にウエストギャザー部が配されており、前記ウエストギャザー部に配置される弾性部材の少なくとも一部が前記薄肉部と重なる吸収性物品。 A front surface sheet on the skin contact surface side, a back surface sheet on the non-skin contact surface side, and a ventral region arranged on the ventral side of the wearer, an inseam region arranged on the inseam, An absorbent article having a longitudinal direction divided into dorsal regions arranged on the dorsal side and a width direction orthogonal to the longitudinal direction.
The absorber has a thin portion extending ventral from the dorsal end of the absorber and having a smaller basis weight of the absorber material than the periphery .
The thin-walled portion is not arranged at the center portion in the width direction of the dorsal end portion of the absorber, and a thick-walled portion having a larger basis weight of the absorber material than the thin-walled portion is arranged on both sides of the thick-walled portion. A plurality of the thin-walled portions are lined up in the width direction from the outside in the width direction.
An absorbent article in which a waist gather portion is arranged at a position where it overlaps with the thin wall portion in the longitudinal direction, and at least a part of an elastic member arranged in the waist gather portion overlaps with the thin wall portion.

前記吸収性物品が、前記背側領域の両側にファスニングテープとテープ基部とを有するテープ型おむつであり、
前記テープ基部の腹側端部は、ウエストギャザー部の腹側端部よりも腹側に延出している、請求項１記載の吸収性物品。 The absorbent article is a tape-type diaper having a fastening tape and a tape base on both sides of the dorsal region.
The absorbent article according to claim 1, wherein the ventral end of the tape base extends ventral to the ventral end of the waist gather portion.

前記薄肉部が吸収体材料を有しない貫通孔である、請求項１又は２記載の吸収性物品。 The absorbent article according to claim 1 or 2, wherein the thin portion is a through hole having no absorbent material.

前記吸収体は肌側吸収層と非肌側吸収層とを有し、
前記薄肉部は前記肌側吸収層及び前記非肌側吸収層に配されて互いに貫通しており、
前記非肌側吸収層における薄肉部の幅が、前記肌側吸収層における薄肉部の幅よりも広い、請求項３記載の吸収性物品。 The absorber has a skin-side absorbing layer and a non-skin-side absorbing layer.
The thin-walled portion is arranged in the skin-side absorbing layer and the non-skin-side absorbing layer and penetrates each other.
The absorbent article according to claim 3, wherein the width of the thin-walled portion in the non-skin-side absorbing layer is wider than the width of the thin-walled portion in the skin-side absorbing layer.

薄肉部の腹側端部は背側領域に位置する、請求項１〜４のいずれか１項に記載の吸収性物品。 The absorbent article according to any one of claims 1 to 4, wherein the ventral end of the thin portion is located in the dorsal region.

前記ウエストギャザー部は、前記薄肉部同士を幅方向に繋ぐ請求項１〜５のいずれか１項に記載の吸収性物品。 The absorbent article according to any one of claims 1 to 5, wherein the waist gather portion connects the thin portions to each other in the width direction.