JP7067693B2

JP7067693B2 - Absorbent article

Info

Publication number: JP7067693B2
Application number: JP2018107389A
Authority: JP
Inventors: 達之山口; 耕裕山本; 祐一廣瀬
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2018-06-05
Filing date: 2018-06-05
Publication date: 2022-05-16
Anticipated expiration: 2038-06-05
Also published as: JP2019208866A

Description

本発明は、生理用ナプキンなどの吸収性物品に関する。 The present invention relates to absorbent articles such as menstrual napkins.

特許文献１には、排泄部対向部における液状物の吸収性を高めるために坪量の高い高坪量部が設けられた生理用ナプキンが開示されている。この生理用ナプキンでは、高坪量部が排泄部対向部から後方部にわたる広い範囲に設けられている。これにより、この生理用ナプキンでは、後方部において厚みの大きい高坪量部が着用者の臀裂に入り込むため、後方部における臀裂に沿った液漏れが発生しにくくなる。 Patent Document 1 discloses a menstrual napkin provided with a high basis weight portion having a high basis weight in order to enhance the absorption of liquid matter in the portion facing the excretion portion. In this menstrual napkin, a high basis weight portion is provided in a wide range from the excretion portion facing portion to the rear portion. As a result, in this menstrual napkin, a thick high basis weight portion enters the wearer's intergluteal cleft in the posterior portion, so that liquid leakage along the intergluteal cleft in the posterior portion is less likely to occur.

特開２０１４－１０４０９３号公報Japanese Unexamined Patent Publication No. 2014-104093

しかしながら、特許文献１に記載の生理用ナプキンでは、高坪量部の剛性が高いため、高坪量部が設けられた後方部が変形しにくい。このため、この生理用ナプキンでは、後方部が臀部の複雑な曲面形状に沿って変形することができずに、後方部に隙間が発生しやすくなる。生理用ナプキンでは、このように後方部に隙間が発生すると、特に就寝姿勢において液漏れが発生しやすくなる。 However, in the sanitary napkin described in Patent Document 1, since the rigidity of the high basis weight portion is high, the rear portion provided with the high basis weight portion is not easily deformed. Therefore, in this sanitary napkin, the rear portion cannot be deformed along the complicated curved surface shape of the buttocks, and a gap is likely to occur in the rear portion. In a menstrual napkin, when a gap is generated in the rear portion in this way, liquid leakage is likely to occur especially in a sleeping posture.

本発明の課題は、後方部における液漏れを防止可能な吸収性物品に関する。 An object of the present invention relates to an absorbent article capable of preventing liquid leakage in the rear portion.

本発明の一形態に係る吸収性物品は、長手方向に並ぶ前方部、中間部、及び後方部を有する吸収性コアと、上記吸収性コア上に配置された表面シートと、上記表面シート側から上記吸収性コアに至る圧搾溝部と、を備える。
上記吸収性コアは、上記後方部に上記長手方向に沿って設けられ、幅方向の中央部に位置する第１太溝部と、上記第１太溝部の上記幅方向の両側に位置する一対の第２太溝部と、該一対の第２太溝部よりも上記幅方向の外側に位置し、上記第１太溝部及び上記一対の第２太溝部よりも細い細溝部を含むコア溝部を更に有する。
上記圧搾溝部は、上記第１太溝部と交差する第１交差部と、上記一対の第２太溝部と交差する一対の第２交差部と、を含み、かつ、上記幅方向に延びる軸との間に成す角度が上記一対の第２交差部において上記第１交差部よりも大きい湾曲部を有する。 The absorbent article according to one embodiment of the present invention includes an absorbent core having a front portion, an intermediate portion, and a rear portion arranged in the longitudinal direction, a surface sheet arranged on the absorbent core, and the surface sheet side. It is provided with a squeezing groove portion leading to the absorbent core.
The absorbent core is provided in the rear portion along the longitudinal direction, and has a first thick groove portion located in the center portion in the width direction and a pair of first thick groove portions located on both sides of the first thick groove portion in the width direction. It further has a two thick groove portion and a core groove portion located outside the width direction of the pair of second thick groove portions and including a fine groove portion thinner than the first thick groove portion and the pair of second thick groove portions.
The squeezed groove portion includes a first intersection portion that intersects with the first thick groove portion and a pair of second intersections that intersect with the pair of second thick groove portions, and has an axis extending in the width direction. The pair of second intersections having an angle between them has a curved portion larger than that of the first intersection.

本発明の吸収性物品によれば、後方部における液漏れを防止可能となる。 According to the absorbent article of the present invention, it is possible to prevent liquid leakage in the rear portion.

本発明の一実施形態に係るナプキンの斜視図である。It is a perspective view of the napkin which concerns on one Embodiment of this invention. 上記ナプキンを平面に沿って展開して示す平面図である。It is a top view which shows the said napkin developed along the plane. 上記ナプキンの図２のIII－III線に沿った断面図である。FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2 of the above napkin. 上記ナプキンの吸収性コアの平面図である。It is a top view of the absorbent core of the said napkin. 上記吸収性コアの図４の一点鎖線で囲んだ領域Vを拡大して示す部分平面図である。FIG. 3 is a partial plan view showing an enlarged region V surrounded by the alternate long and short dash line in FIG. 4 of the absorbent core. 上記ナプキンの図５に対応する領域における圧搾溝部の部分平面図である。It is a partial plan view of the squeeze groove portion in the region corresponding to FIG. 5 of the said napkin. 上記ナプキンの図５に対応する領域における吸収性コア及び圧搾溝部の部分平面図である。It is a partial plan view of the absorbent core and the squeeze groove portion in the region corresponding to FIG. 5 of the above-mentioned napkin. 上記ナプキンの図７の一点鎖線で囲んだ領域VIIIAにおける吸収性コア及び圧搾溝部を拡大して示す模式図である。FIG. 3 is an enlarged schematic view showing an absorbent core and a squeezed groove portion in the region VIIIA surrounded by the alternate long and short dash line in FIG. 7 of the above napkin. 上記ナプキンの図７の一点鎖線で囲んだ領域VIIIBにおける吸収性コア及び圧搾溝部を拡大して示す模式図である。FIG. 3 is an enlarged schematic view showing an absorbent core and a squeezed groove portion in the region VIIIB surrounded by the alternate long and short dash line in FIG. 7 of the above napkin. 上記ナプキンの図７の一点鎖線で囲んだ領域VIIICにおける吸収性コア及び圧搾溝部を拡大して示す模式図である。FIG. 3 is an enlarged schematic view showing an absorbent core and a squeezed groove portion in the region VIIIC surrounded by the alternate long and short dash line in FIG. 7 of the above napkin.

以下、図面を参照しながら、本発明の一実施形態を説明する。
図面には、適宜相互に直交するＸ軸、Ｙ軸、及びＺ軸が示されている。Ｘ軸、Ｙ軸、及びＺ軸は全図において共通である。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The drawings show X-axis, Y-axis, and Z-axis that are orthogonal to each other as appropriate. The X-axis, Y-axis, and Z-axis are common to all drawings.

［ナプキン１の全体構成］
図１に示すナプキン１は、着用者の経血などの液状物を吸収するための吸収性物品である生理用ナプキンであり、例えば、就寝中に利用される夜用の生理用ナプキンとして構成される。図２では、図１に示すナプキン１をＸＹ平面に沿って引き延ばした展開図として示している。図２に示すナプキン１では、Ｘ軸方向が長手方向に対応し、Ｙ軸方向が幅方向に対応し、Ｚ軸方向が厚み方向に対応する。なお、本明細書では、Ｚ軸方向（厚み方向）に関しては、着用時に着用者の肌に近い側を上、着衣に近い側を下という事がある。 [Overall configuration of napkin 1]
The napkin 1 shown in FIG. 1 is a menstrual napkin which is an absorbent article for absorbing liquid substances such as menstrual blood of the wearer, and is configured as, for example, a nighttime menstrual napkin used during sleep. To. FIG. 2 shows the napkin 1 shown in FIG. 1 as a stretched view along the XY plane. In the napkin 1 shown in FIG. 2, the X-axis direction corresponds to the longitudinal direction, the Y-axis direction corresponds to the width direction, and the Z-axis direction corresponds to the thickness direction. In the present specification, in the Z-axis direction (thickness direction), the side closer to the wearer's skin may be referred to as the upper side and the side closer to the clothing may be referred to as the lower side when worn.

ナプキン１は、本体部Ｍと、ウイング部Ｗと、フラップ部Ｆと、を備える。本体部Ｍは、Ｘ軸方向に沿って帯状に延びる。ウイング部Ｗ及びフラップ部Ｆは、本体部ＭからＹ軸方向外側に延出する。ウイング部Ｗは本体部ＭのＸ軸方向中央部の前方寄りに位置し、フラップ部Ｆはウイング部ＷよりもＸ軸方向後方に位置している。なお、ナプキン１では、ウイング部Ｗ及びフラップ部Ｆは必須の構成ではない。 The napkin 1 includes a main body portion M, a wing portion W, and a flap portion F. The main body portion M extends in a band shape along the X-axis direction. The wing portion W and the flap portion F extend outward in the Y-axis direction from the main body portion M. The wing portion W is located closer to the front of the central portion of the main body portion M in the X-axis direction, and the flap portion F is located behind the wing portion W in the X-axis direction. In the napkin 1, the wing portion W and the flap portion F are not indispensable configurations.

また、ナプキン１の後方部におけるＹ軸方向中央には、表面シート１２側に窪み部６０が設けられている。窪み部６０は、ナプキン１の後方部におけるＹ軸方向中央部分を指で触って認識できるように設けられている。窪み部６０は、Ｘ軸方向の全長が大きく、装着時に後方部が視認し難いナプキン１を適正な位置に装着するのに役立つ。なお、ナプキン１では、窪み部６０は必須の構成ではない。 Further, a recess 60 is provided on the surface sheet 12 side at the center in the Y-axis direction in the rear portion of the napkin 1. The recess 60 is provided so that the central portion in the rear portion of the napkin 1 in the Y-axis direction can be touched and recognized by a finger. The recessed portion 60 has a large overall length in the X-axis direction and is useful for mounting the napkin 1 in an appropriate position, which is difficult to see at the rear portion when mounted. In the napkin 1, the recess 60 is not an essential configuration.

図３に示すように、ナプキン１は、吸収体１１と、表面シート１２と、裏面シート１３と、サイドシート１４と、を備える。裏面シート１３は、本体部Ｍ及びウイング部Ｗにわたって延び、Ｚ軸方向上側に吸収体１１、表面シート１２、及びサイドシート１４を保持する。吸収体１１は、本体部Ｍに位置し、Ｚ軸方向上側から表面シート１２に覆われている。サイドシート１４は、ウイング部Ｗ及びフラップ部Ｆに位置する。 As shown in FIG. 3, the napkin 1 includes an absorber 11, a front surface sheet 12, a back surface sheet 13, and a side sheet 14. The back surface sheet 13 extends over the main body portion M and the wing portion W, and holds the absorber 11, the front surface sheet 12, and the side sheet 14 on the upper side in the Z-axis direction. The absorber 11 is located in the main body portion M and is covered with the surface sheet 12 from the upper side in the Z-axis direction. The side seat 14 is located at the wing portion W and the flap portion F.

表面シート１２は、液透過性を有し、Ｚ軸方向上側から排泄された液状物を吸収体１１に透過させる。吸収体１１は、表面シート１２を透過した液状物を吸収可能に構成されている。裏面シート１３は、防漏性を有し、吸収体１１からＺ軸方向下方への液漏れを防止する。また、裏面シート１３のＺ軸方向下側には、ナプキン１を下着に固定するための粘着部１５が設けられている。 The surface sheet 12 has liquid permeability and allows the liquid material excreted from the upper side in the Z-axis direction to permeate through the absorber 11. The absorber 11 is configured to be able to absorb a liquid substance that has passed through the surface sheet 12. The back surface sheet 13 has a leak-proof property and prevents liquid leakage from the absorber 11 downward in the Z-axis direction. Further, on the lower side of the back sheet 13 in the Z-axis direction, an adhesive portion 15 for fixing the napkin 1 to the underwear is provided.

吸収体１１は、吸収性コア２０と、吸収性コア２０を被覆するコアラップシート３０と、を有する。コアラップシート３０は、例えばティッシュペーパーなどの液透過性のシートで構成され、表面シート１２を透過した液状物を吸収性コア２０に透過させる。吸収性コア２０は、例えばパルプ繊維などの親水性繊維の集合体で構成され、コアラップシート３０を透過した液状物を吸収して保持する。 The absorber 11 has an absorbent core 20 and a core wrap sheet 30 that covers the absorbent core 20. The core wrap sheet 30 is made of a liquid-permeable sheet such as tissue paper, and the liquid material that has permeated the surface sheet 12 is permeated through the absorbent core 20. The absorbent core 20 is composed of an aggregate of hydrophilic fibers such as pulp fibers, and absorbs and retains a liquid substance that has permeated through the core wrap sheet 30.

吸収性コア２０を構成する親水性繊維としては、公知の親水性繊維から任意に選択可能である。具体的に、親水性繊維としては、例えば、パルプ繊維、レーヨン繊維、コットン繊維、酢酸セルロースなどのセルロース系の親水性繊維、ポリエチレン、ポリプロピレンなどのポリオレフィン系繊維、ポリエステル、ポリアミドなどの縮合系繊維から１種又は２種以上を選択可能である。 The hydrophilic fibers constituting the absorbent core 20 can be arbitrarily selected from known hydrophilic fibers. Specifically, the hydrophilic fibers include, for example, cellulosic hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers and cellulose acetate, polyolefin fibers such as polyethylene and polypropylene, and condensed fibers such as polyester and polyamide. One type or two or more types can be selected.

吸収性コア２０には、親水性繊維に担持された吸水性ポリマーが含まれていてもよい。具体的に、吸水性ポリマーとしては、例えば、ポリアクリル酸ナトリウム、アクリル酸－ビニルアルコール共重合体、ポリアクリル酸ナトリウム架橋体、でんぷん－アクリル酸グラフト共重合体、イソブチレン－無水マレイン酸共重合体及びそのケン化物、ポリアスパラギン酸から１種又は２種以上を選択可能である。 The absorbent core 20 may contain a water-absorbent polymer supported on hydrophilic fibers. Specifically, examples of the water-absorbent polymer include sodium polyacrylate, acrylic acid-vinyl alcohol copolymer, sodium polyacrylate crosslinked polymer, starch-acrylic acid graft copolymer, and isobutylene-maleic anhydride copolymer. And one or more of them can be selected from the saponified product and polyacrylic acid.

また、ナプキン１は、本体部Ｍに設けられた圧搾溝部５０を備える。圧搾溝部５０は、本体部Ｍの外側への液漏れを防止可能なように、ＸＹ平面に沿って設けられた線状溝である。圧搾溝部５０は、典型的には、本体部Ｍ内の領域をＹ軸方向に対称に周回する形状で設けられる。圧搾溝部５０は、吸収体１１上の表面シート１２のＺ軸方向上側からの圧搾加工によって形成される。 Further, the napkin 1 includes a squeezing groove portion 50 provided in the main body portion M. The squeezing groove portion 50 is a linear groove provided along the XY plane so as to prevent liquid leakage to the outside of the main body portion M. The squeezing groove portion 50 is typically provided in a shape that orbits a region in the main body portion M symmetrically in the Y-axis direction. The squeezing groove portion 50 is formed by squeezing the surface sheet 12 on the absorber 11 from the upper side in the Z-axis direction.

圧搾加工された圧搾溝部５０では、表面シート１２及びコアラップシート３０が、吸収性コア２０中へＺ軸方向下方に沈み込んでいる。圧搾溝部５０では、吸収性コア２０がＺ軸方向下方に圧縮されて高密度となっているため、吸収性コア２０の剛性が高い。したがって、圧搾溝部５０によって、吸収性コア２０の剛性を部分的に高くすることすることができる。圧搾溝部５０の詳細な構成については後述する。 In the squeezed groove portion 50 that has been squeezed, the surface sheet 12 and the core wrap sheet 30 are subducted downward in the Z-axis direction into the absorbent core 20. In the squeeze groove portion 50, the absorbent core 20 is compressed downward in the Z-axis direction to have a high density, so that the rigidity of the absorbent core 20 is high. Therefore, the squeezing groove portion 50 can partially increase the rigidity of the absorbent core 20. The detailed configuration of the squeeze groove portion 50 will be described later.

［吸収性コア２０の詳細］
（吸収性コア２０の平面形状）
図４に示すように、吸収性コア２０は、Ｘ軸方向に帯状に延びる。また、吸収性コア２０は、Ｘ軸方向に並ぶ、前方部２１、中間部２２、及び後方部２３を有する。つまり、吸収性コア２０では、前方部２１及び後方部２３が、中間部２２を挟んでＸ軸方向に対向している。吸収性コア２０は、前方部２１、中間部２２、及び後方部２３のいずれにおいても、Ｙ軸方向に左右対称な平面形状を有する。 [Details of absorbent core 20]
(Plane shape of absorbent core 20)
As shown in FIG. 4, the absorbent core 20 extends in a band shape in the X-axis direction. Further, the absorbent core 20 has a front portion 21, an intermediate portion 22, and a rear portion 23 arranged in the X-axis direction. That is, in the absorbent core 20, the front portion 21 and the rear portion 23 face each other in the X-axis direction with the intermediate portion 22 interposed therebetween. The absorbent core 20 has a planar shape symmetrical in the Y-axis direction in any of the front portion 21, the intermediate portion 22, and the rear portion 23.

吸収性コア２０は、前方部２１と後方部２３とでＹ軸方向の寸法が等しく、装着者の両脚にＹ軸方向に挟まれる中間部２２においてＹ軸方向に括れた形状を有する。これにより、吸収性コア２０では、より多くの液状物を吸収できるように前方部２１及び後方部２３のＹ軸方向の寸法を大きくしても、装着者の両脚から中間部２２に加わる力の影響による変形や位置ずれの発生を抑制することができる。 The absorbent core 20 has the same dimension in the Y-axis direction between the front portion 21 and the rear portion 23, and has a shape confined in the Y-axis direction at the intermediate portion 22 sandwiched between both legs of the wearer in the Y-axis direction. As a result, in the absorbent core 20, even if the dimensions of the front portion 21 and the rear portion 23 in the Y-axis direction are increased so that more liquid matter can be absorbed, the force applied to the intermediate portion 22 from both legs of the wearer is applied. It is possible to suppress the occurrence of deformation and misalignment due to the influence.

中間部２２のＹ軸方向の寸法は、好ましくは４０ｍｍ以上７５ｍｍ以下であり、より好ましくは５０ｍｍ以上７０ｍｍ以下である。なお、吸収性コア２０では、中間部２２においてＹ軸方向に括れた形状であることは必須ではない。例えば、前方部２１及び後方部２３のＹ軸方向の寸法が大きくない場合には、中間部２２も前方部２１及び後方部２３と同等のＹ軸方向の寸法を有していてもよい。 The dimension of the intermediate portion 22 in the Y-axis direction is preferably 40 mm or more and 75 mm or less, and more preferably 50 mm or more and 70 mm or less. In the absorbent core 20, it is not essential that the intermediate portion 22 has a shape confined in the Y-axis direction. For example, when the dimensions of the front portion 21 and the rear portion 23 in the Y-axis direction are not large, the intermediate portion 22 may also have the same dimensions in the Y-axis direction as the front portion 21 and the rear portion 23.

また、吸収性コア２０のＹ軸方向の寸法は、前方部２１と後方部２３とで異なっていてもよい。更に、吸収性コア２０では、前方部２１、中間部２２、及び後方部２３のそれぞれにおけるＹ軸方向の寸法が一定でなくてもよく、前方部２１、中間部２２、及び後方部２３が曲線的な輪郭を有していてもよい。加えて、吸収性コア２０における前方部２１、中間部２２、及び後方部２３のＸ軸方向に占める比率は適宜決定可能である。 Further, the dimensions of the absorbent core 20 in the Y-axis direction may differ between the front portion 21 and the rear portion 23. Further, in the absorbent core 20, the dimensions in the Y-axis direction of each of the front portion 21, the intermediate portion 22, and the rear portion 23 do not have to be constant, and the front portion 21, the intermediate portion 22, and the rear portion 23 are curved. It may have a specific contour. In addition, the ratio of the front portion 21, the intermediate portion 22, and the rear portion 23 of the absorbent core 20 in the X-axis direction can be appropriately determined.

（高坪量部２４）
吸収性コア２０は、図４にドットパターンで示す位置に高坪量部２４を有する。つまり、高坪量部２４は、排泄部対向領域を含む中間部２２のＹ軸方向中央部に位置する。図３に示すように、高坪量部２４は、Ｚ軸方向上方に突出しており、吸収性コア２０における高坪量部２４以外の部分よりも坪量が高い。坪量が高い高坪量部２４は、排泄部から排泄された液状物をより良好に吸収可能である。 (High basis weight section 24)
The absorbent core 20 has a high basis weight portion 24 at a position shown by a dot pattern in FIG. That is, the high basis weight portion 24 is located at the central portion in the Y-axis direction of the intermediate portion 22 including the region facing the excretion portion. As shown in FIG. 3, the high basis weight portion 24 projects upward in the Z-axis direction, and has a higher basis weight than the portion other than the high basis weight portion 24 in the absorbent core 20. The high basis weight section 24 having a high basis weight can better absorb the liquid matter excreted from the excretion section.

高坪量部２４の坪量は、適宜決定可能である。一例として、高坪量部２４の坪量は、吸収性コア２０における高坪量部２４以外の部分の坪量よりも、５０ｇ／ｍ^２以上大きいことが好ましく、１００ｇ／ｍ^２以上大きいことがより好ましい。また、高坪量部２４の坪量は、好ましくは４００ｇ／ｍ^２以上１０００ｇ／ｍ^２以下であり、より好ましくは５００ｇ／ｍ^２以上９００ｇ／ｍ^２以下である。 The basis weight of the high basis weight portion 24 can be appropriately determined. As an example, the basis weight of the high basis weight portion 24 is preferably 50 g / m ² or more larger than the basis weight of the portion other than the high basis weight portion 24 in the absorbent core 20, and 100 g / m ² or more. More preferred. The basis weight of the high basis weight portion 24 is preferably 400 g / m ² or more and 1000 g / m ² or less, and more preferably 500 g / m ² or more and 900 g / m ² or less.

吸収性コア２０には、高坪量部２４の周縁を囲む周縁溝部２４ａが設けられている。周縁溝部２４ａは、Ｚ軸方向に肉薄であるため、剛性が低くなっている。このため、吸収性コア２０では、周縁溝部２４ａが、高坪量部２４以外の部分に加わる変形などによる高坪量部２４への影響を抑制する。これにより、吸収性コア２０では、高坪量部２４が変形しにくくなるため、液漏れが生じにくくなる。 The absorbent core 20 is provided with a peripheral groove portion 24a surrounding the peripheral edge of the high basis weight portion 24. Since the peripheral groove portion 24a is thin in the Z-axis direction, its rigidity is low. Therefore, in the absorbent core 20, the peripheral groove portion 24a suppresses the influence on the high basis weight portion 24 due to deformation or the like applied to the portion other than the high basis weight portion 24. As a result, in the absorbent core 20, the high basis weight portion 24 is less likely to be deformed, so that liquid leakage is less likely to occur.

なお、高坪量部２４は、図３，４に示す構成に限定されない。例えば、高坪量部２４の平面形状は、図４に示すようなＸ軸方向両端部が丸みを帯びた形状ではなく、角ばった矩形状であってもよい。また、吸収性コア２０では、液状物の吸収性が充分に確保できる場合などには、高坪量部２４を省略してもよい。この場合、吸収性コア２０の坪量は、その全体にわたって均一とすることができる。 The high basis weight portion 24 is not limited to the configuration shown in FIGS. 3 and 4. For example, the planar shape of the high basis weight portion 24 may be a square rectangular shape instead of a shape in which both ends in the X-axis direction are rounded as shown in FIG. Further, in the absorbent core 20, the high basis weight portion 24 may be omitted when the absorbability of the liquid substance can be sufficiently ensured. In this case, the basis weight of the absorbent core 20 can be uniform over the entire area.

（コア溝部４０）
吸収性コア２０には、Ｚ軸方向上側から下側に凹むコア溝部４０が形成されている。図４に示すように、コア溝部４０は、Ｘ軸方向に延び、Ｙ軸方向に配列された縦溝と、Ｙ軸方向に延び、Ｘ軸方向に配列された横溝と、を含む。コア溝部４０は、Ｚ軸方向の寸法が小さく、つまり肉薄であるため、剛性が低くなっている。したがって、吸収性コア２０には、コア溝部４０を起点とする変形が発生しやすい。 (Core groove 40)
The absorbent core 20 is formed with a core groove portion 40 recessed from the upper side to the lower side in the Z-axis direction. As shown in FIG. 4, the core groove portion 40 includes a vertical groove extending in the X-axis direction and arranged in the Y-axis direction, and a horizontal groove extending in the Y-axis direction and arranged in the X-axis direction. The core groove portion 40 has a small dimension in the Z-axis direction, that is, is thin, and therefore has low rigidity. Therefore, the absorbent core 20 is likely to be deformed starting from the core groove portion 40.

つまり、吸収性コア２０にコア溝部４０を設けることにより、吸収性コア２０の変形の起点を予め定めることができる。これにより、ナプキン１では、着用時の吸収性コア２０の変形を制御することができ、例えば着用者の寝返りなどの動作時における吸収性コア２０の意図しない変形による隙間の発生を抑制することができる。これにより、ナプキン１では、液漏れを発生しにくくすることができる。 That is, by providing the core groove portion 40 in the absorbent core 20, the starting point of deformation of the absorbent core 20 can be determined in advance. As a result, the napkin 1 can control the deformation of the absorbent core 20 when worn, and can suppress the generation of gaps due to unintended deformation of the absorbent core 20 during operation such as turning over of the wearer. can. As a result, the napkin 1 can be made less likely to leak.

また、図４に示すように、コア溝部４０の溝幅は一定ではなく、吸収性コア２０には相互に異なる溝幅のコア溝部４０が含まれる。吸収性コア２０では、溝幅の大きいコア溝部４０ほど変形の起点となりやすい。このため、吸収性コア２０に求められる変形に応じて、大きい変形を生じさせたい領域のコア溝部４０の溝幅を大きく、変形を小さく留めたい領域のコア溝部４０の溝幅を小さく形成することができる。 Further, as shown in FIG. 4, the groove width of the core groove portion 40 is not constant, and the absorbent core 20 includes the core groove portions 40 having different groove widths. In the absorbent core 20, the core groove portion 40 having a larger groove width is more likely to be the starting point of deformation. Therefore, in accordance with the deformation required for the absorbent core 20, the groove width of the core groove portion 40 in the region where large deformation is desired is formed to be large, and the groove width of the core groove portion 40 in the region where deformation is desired to be kept small is formed to be small. Can be done.

図５は、吸収性コア２０の後方部２３を示している。後方部２３のコア溝部４０には、第１太溝部４１と、第２太溝部４２と、細溝部４３と、が含まれる。第１太溝部４１、第２太溝部４２、及び細溝部４３はいずれも、Ｘ軸方向に延びる縦溝である。第１太溝部４１及び第２太溝部４２の溝幅は同等である。細溝部４３の溝幅は第１太溝部４１及び第２太溝部４２の溝幅よりも小さい。 FIG. 5 shows the rear portion 23 of the absorbent core 20. The core groove portion 40 of the rear portion 23 includes a first thick groove portion 41, a second thick groove portion 42, and a fine groove portion 43. The first thick groove portion 41, the second thick groove portion 42, and the fine groove portion 43 are all vertical grooves extending in the X-axis direction. The groove widths of the first thick groove portion 41 and the second thick groove portion 42 are the same. The groove width of the narrow groove portion 43 is smaller than the groove width of the first thick groove portion 41 and the second thick groove portion 42.

第１太溝部４１は、Ｙ軸方向中央部に位置する。第２太溝部４２は、第１太溝部４１のＹ軸方向両側に位置する。細溝部４３は、第２太溝部４２よりも更にＹ軸方向外側に位置する。つまり、第１太溝部４１及び第２太溝部４２はいずれも、細溝部４３よりもＹ軸方向内側に位置している。なお、コア溝部４０には、必要に応じ、第１太溝部４１、第２太溝部４２、及び細溝部４３以外の縦溝が含まれていてもよい。 The first thick groove portion 41 is located at the central portion in the Y-axis direction. The second thick groove portion 42 is located on both sides of the first thick groove portion 41 in the Y-axis direction. The narrow groove portion 43 is located further outside in the Y-axis direction than the second thick groove portion 42. That is, both the first thick groove portion 41 and the second thick groove portion 42 are located inside the narrow groove portion 43 in the Y-axis direction. The core groove portion 40 may include a vertical groove other than the first thick groove portion 41, the second thick groove portion 42, and the fine groove portion 43, if necessary.

太溝部４１，４２の溝幅は、特定の構成に限定されない。一例として、太溝部４１，４２の溝幅は、典型的には２．５ｍｍ以上であり、好ましくは３ｍｍ以上である。また、太溝部４１，４２の溝幅は、典型的には５．５ｍｍ以下であり、好ましくは５ｍｍ以下である。更に、太溝部４１，４２の溝幅は、典型的には２．５ｍｍ以上５．５ｍｍ以下であり、好ましくは３ｍｍ以上５ｍｍ以下である。 The groove widths of the thick groove portions 41 and 42 are not limited to a specific configuration. As an example, the groove widths of the thick groove portions 41 and 42 are typically 2.5 mm or more, preferably 3 mm or more. The groove width of the thick groove portions 41 and 42 is typically 5.5 mm or less, preferably 5 mm or less. Further, the groove widths of the thick groove portions 41 and 42 are typically 2.5 mm or more and 5.5 mm or less, preferably 3 mm or more and 5 mm or less.

細溝部４３の溝幅も、特定の構成に限定されない。一例として、細溝部４３の溝幅は、典型的には０．５ｍｍ以上であり、好ましくは１ｍｍ以上である。また、細溝部４３の溝幅は、典型的には２．５ｍｍ以下であり、好ましくは２ｍｍ以下である。更に、細溝部４３の溝幅は、典型的には０．５ｍｍ以上２．５ｍｍ以下であり、好ましくは１ｍｍ以上２ｍｍ以下である。 The groove width of the narrow groove portion 43 is also not limited to a specific configuration. As an example, the groove width of the fine groove portion 43 is typically 0.5 mm or more, preferably 1 mm or more. The groove width of the fine groove portion 43 is typically 2.5 mm or less, preferably 2 mm or less. Further, the groove width of the fine groove portion 43 is typically 0.5 mm or more and 2.5 mm or less, preferably 1 mm or more and 2 mm or less.

第１太溝部４１及び第２太溝部４２は、細溝部４３よりも液状物がＸ軸方向に流れる流路となりやすい。この点、吸収性コア２０では、第１太溝部４１及び第２太溝部４２がいずれもＹ軸方向内側に配置されているため、液状物をＹ軸方向内側に留めることができる。これにより、ナプキン１では、吸収性コア２０のＹ軸方向外側への液漏れの発生を抑制することができる。 The first thick groove portion 41 and the second thick groove portion 42 are more likely to be a flow path through which a liquid substance flows in the X-axis direction than the fine groove portion 43. In this respect, in the absorbent core 20, since the first thick groove portion 41 and the second thick groove portion 42 are both arranged inside in the Y-axis direction, the liquid material can be fastened inside in the Y-axis direction. As a result, in the napkin 1, it is possible to suppress the occurrence of liquid leakage of the absorbent core 20 to the outside in the Y-axis direction.

また、液漏れの発生を更に効果的に抑制するために、第１太溝部４１及び第２太溝部４２の位置は、吸収した液状物を保持する機能を有する高坪量部２４が配置されたＹ軸方向の範囲Ｒ２４（図５参照）と同程度の範囲内に収まっていることが更に好ましい。この観点から、Ｙ軸方向外側に位置する第２太溝部４２の溝幅方向の少なくとも一部が、高坪量部２４とＸ軸方向に対向していることが好ましい。 Further, in order to more effectively suppress the occurrence of liquid leakage, a high basis weight portion 24 having a function of holding the absorbed liquid material is arranged at the positions of the first thick groove portion 41 and the second thick groove portion 42. It is more preferable that the range is within the same range as the range R24 in the Y-axis direction (see FIG. 5). From this viewpoint, it is preferable that at least a part of the second thick groove portion 42 located outside in the Y-axis direction in the groove width direction faces the high basis weight portion 24 in the X-axis direction.

吸収性コア２０の後方部２３では、Ｙ軸方向内側の領域が臀裂に対向する。後方部２３のＹ軸方向内側の領域は、変形の起点になりやすい第１太溝部４１及び第２太溝部４２が配置されているため、臀裂に食い込むように大きく変形することができる。この一方で、後方部２３の細溝部４３が形成されたＹ軸方向外側の領域は、緩やかに変形することにより、臀部の形状に沿って滑らかにフィットする。 In the rear portion 23 of the absorbent core 20, the region inside in the Y-axis direction faces the intergluteal cleft. In the region inside the rear portion 23 in the Y-axis direction, the first thick groove portion 41 and the second thick groove portion 42, which are likely to be the starting points of deformation, are arranged, so that the region can be greatly deformed so as to bite into the intergluteal cleft. On the other hand, the region on the outer side in the Y-axis direction in which the narrow groove portion 43 of the rear portion 23 is formed is gently deformed to smoothly fit along the shape of the buttocks.

また、吸収性コア２０の後方部２３では、Ｙ軸方向中央部に位置する第１太溝部４１が臀裂に最も深く食い込む。このため、後方部２３では、第１太溝部４１が選択的に、第２太溝部４２よりも大きい変形の起点となる必要がある。第１太溝部４１を確実に大きい変形の起点とするためには、第２太溝部４２の剛性を第１太溝部４１の剛性よりも高くする必要がある。 Further, in the rear portion 23 of the absorbent core 20, the first thick groove portion 41 located at the central portion in the Y-axis direction bites deepest into the intergluteal cleft. Therefore, in the rear portion 23, the first thick groove portion 41 needs to selectively serve as a starting point of deformation larger than that of the second thick groove portion 42. In order to ensure that the first thick groove portion 41 is the starting point of large deformation, it is necessary to make the rigidity of the second thick groove portion 42 higher than the rigidity of the first thick groove portion 41.

この一方で、第１太溝部４１のＹ軸方向両側に隣接する第２太溝部４２も、第１太溝部４１とともに臀裂に食い込む際に、第１太溝部４１に次いで大きく変形する必要がある。このため、第２太溝部４２の剛性は、第１太溝部４１の剛性に準ずる程度に低く留めることが好ましい。したがって、第２太溝部４２の剛性は、第１太溝部４１の剛性よりも僅かに高い程度とすることが好ましい。 On the other hand, the second thick groove 42 adjacent to both sides of the first thick groove 41 in the Y-axis direction also needs to be greatly deformed next to the first thick groove 41 when biting into the intergluteal cleft together with the first thick groove 41. .. Therefore, it is preferable that the rigidity of the second thick groove portion 42 is kept as low as the rigidity of the first thick groove portion 41. Therefore, it is preferable that the rigidity of the second thick groove portion 42 is slightly higher than the rigidity of the first thick groove portion 41.

［圧搾溝部５０の詳細］
図６は、図５に示す領域Vに対応する領域における圧搾溝部５０を示している。圧搾溝部５０には、吸収性コア２０の後方部２３に対応する位置に、Ｘ軸方向前方から後方に張り出した第１湾曲部５１、第２湾曲部５２、及び第３湾曲部５３が設けられている。圧搾溝部５０では、Ｘ軸方向前方から後方に向けて、第１湾曲部５１、第２湾曲部５２、第３湾曲部５３の順番で並んでいる。 [Details of squeezing groove 50]
FIG. 6 shows the squeezed groove portion 50 in the region corresponding to the region V shown in FIG. The squeeze groove portion 50 is provided with a first curved portion 51, a second curved portion 52, and a third curved portion 53 that project from the front to the rear in the X-axis direction at positions corresponding to the rear portion 23 of the absorbent core 20. ing. In the squeeze groove portion 50, the first curved portion 51, the second curved portion 52, and the third curved portion 53 are arranged in this order from the front to the rear in the X-axis direction.

第１湾曲部５１及び第２湾曲部５２はそれぞれ、Ｙ軸方向中央部にＸ軸方向の後端部Ｐを有し、Ｘ軸方向前方から後端部Ｐに向けてＸ軸方向後方に突出している。第３湾曲部５３は、Ｙ軸方向中央部の両外側にそれぞれＸ軸方向の後端部Ｐを有し、２つの後端部ＰからＹ軸方向中央部に向けてＸ軸方向前方に突出している。つまり、第１湾曲部５１及び第２湾曲部５２はＵ字状であり、第３湾曲部５３はＷ字状である。 Each of the first curved portion 51 and the second curved portion 52 has a rear end portion P in the X-axis direction at the central portion in the Y-axis direction, and projects rearward in the X-axis direction from the front in the X-axis direction toward the rear end portion P. ing. The third curved portion 53 has rear end portions P in the X-axis direction on both outer sides of the central portion in the Y-axis direction, and protrudes forward in the X-axis direction from the two rear end portions P toward the central portion in the Y-axis direction. ing. That is, the first curved portion 51 and the second curved portion 52 are U-shaped, and the third curved portion 53 is W-shaped.

図７は、図５に示す吸収性コア２０に、図６に示す圧搾溝部５０を重ねて示している。圧搾溝部５０は、第１太溝部４１、第２太溝部４２、及び細溝部４３と交差している。第１太溝部４１、第２太溝部４２、及び細溝部４３はそれぞれ、圧搾溝部５０と交差することで部分的に剛性が高くなっている。つまり、第１太溝部４１、第２太溝部４２、及び細溝部４３は、圧搾溝部５０によって変形が抑制される。 FIG. 7 shows the absorbent core 20 shown in FIG. 5 overlaid with the squeezed groove portion 50 shown in FIG. The squeezed groove portion 50 intersects with the first thick groove portion 41, the second thick groove portion 42, and the narrow groove portion 43. The first thick groove portion 41, the second thick groove portion 42, and the fine groove portion 43 each intersect with the squeeze groove portion 50 to partially increase the rigidity. That is, the first thick groove portion 41, the second thick groove portion 42, and the fine groove portion 43 are suppressed from being deformed by the squeezed groove portion 50.

より具体的に、第１湾曲部５１は、第１太溝部４１と交差する交差部５１ａと、第２太溝部４２と交差する交差部５１ｂと、を有する。第２湾曲部５２は、第１太溝部４１と交差する交差部５２ａと、第２太溝部４２と交差する交差部５２ｂと、を有する。第３湾曲部５３は、第１太溝部４１と交差する交差部５３ａと、第２太溝部４２と交差する交差部５３ｂと、を有する。 More specifically, the first curved portion 51 has an intersection 51a that intersects the first thick groove portion 41 and an intersection 51b that intersects the second thick groove portion 42. The second curved portion 52 has an intersection portion 52a that intersects with the first thick groove portion 41 and an intersection portion 52b that intersects with the second thick groove portion 42. The third curved portion 53 has an intersection portion 53a that intersects with the first thick groove portion 41 and an intersection portion 53b that intersects with the second thick groove portion 42.

図８Ａは第１湾曲部５１の交差部５１ａ，５１ｂ付近を示し、図８Ｂは第２湾曲部５２の交差部５２ａ，５２ｂ付近を示し、図８Ｃは第３湾曲部５３の交差部５３ａ，５３ｂ付近を示している。図８Ａ～８Ｃは、太溝部４１，４２及び湾曲部５１～５３をそれぞれ溝幅方向の中心線で模式的に示している。なお、図８Ａ～８Ｃでは、太溝部４１，４２及び湾曲部５１～５３以外の構成を省略している。 8A shows the vicinity of the intersections 51a and 51b of the first bending portion 51, FIG. 8B shows the vicinity of the intersections 52a and 52b of the second bending portion 52, and FIG. 8C shows the intersections 53a and 53b of the third bending portion 53. It shows the vicinity. 8A to 8C schematically show the thick groove portions 41 and 42 and the curved portions 51 to 53 with a center line in the groove width direction, respectively. In FIGS. 8A to 8C, configurations other than the thick groove portions 41 and 42 and the curved portions 51 to 53 are omitted.

図８Ａには、第１湾曲部５１の交差部５１ａ，５１ｂを通り、Ｙ軸に平行な軸Ｃと、交差部５１ａ，５１ｂにおける第１湾曲部５１の接線Ｔと、が示されている。交差部５１ａでは、軸Ｃと接線Ｔとが一致し、軸Ｃと接線Ｔとの成す角度θがゼロである。交差部５１ｂでは、軸Ｃと接線Ｔとがゼロより大きい角度θを成している。つまり、軸Ｃと接線Ｔとの成す角度θは、交差部５１ｂにおいて交差部５１ａよりも大きい。 FIG. 8A shows an axis C that passes through the intersections 51a and 51b of the first bending 51 and is parallel to the Y axis, and a tangent T of the first bending 51 at the intersections 51a and 51b. At the intersection 51a, the axis C and the tangent line T coincide with each other, and the angle θ formed by the axis C and the tangent line T is zero. At the intersection 51b, the axis C and the tangent T form an angle θ larger than zero. That is, the angle θ formed by the axis C and the tangent line T is larger at the intersection 51b than at the intersection 51a.

したがって、交差部５１ａでは第１湾曲部５１と第１太溝部４１とが直交するのに対し、交差部５１ｂでは第１湾曲部５１と第２太溝部４２とが斜めに交差する。このため、第２太溝部４２では、第１太溝部４１よりも、第１湾曲部５１との交差面積が大きくなるため、広い領域で剛性が高くなる。このように、第１湾曲部５１の作用によって、第１太溝部４１と第２太溝部４２とにおける剛性の差が得られる。 Therefore, at the intersection 51a, the first curved portion 51 and the first thick groove portion 41 are orthogonal to each other, while at the intersection 51b, the first curved portion 51 and the second thick groove portion 42 intersect diagonally. Therefore, in the second thick groove portion 42, the intersecting area with the first curved portion 51 is larger than that in the first thick groove portion 41, so that the rigidity is increased in a wide area. In this way, the difference in rigidity between the first thick groove portion 41 and the second thick groove portion 42 can be obtained by the action of the first curved portion 51.

図８Ｂには、第２湾曲部５２の交差部５２ａ，５２ｂを通り、Ｙ軸に平行な軸Ｃと、交差部５２ａ，５２ｂにおける第２湾曲部５２の接線Ｔと、が示されている。第２湾曲部５２では、第１湾曲部５１と同様に、軸Ｃと接線Ｔとの成す角度θは、交差部５２ｂにおいて交差部５２ａよりも大きい。したがって、第２湾曲部５２の作用によっても、第１太溝部４１と第２太溝部４２とにおける剛性の差が得られる。 FIG. 8B shows an axis C that passes through the intersections 52a and 52b of the second curved portion 52 and is parallel to the Y axis, and a tangent T of the second curved portion 52 at the intersections 52a and 52b. In the second curved portion 52, similarly to the first curved portion 51, the angle θ formed by the axis C and the tangent line T is larger at the intersection 52b than at the intersection 52a. Therefore, the difference in rigidity between the first thick groove portion 41 and the second thick groove portion 42 can also be obtained by the action of the second curved portion 52.

なお、湾曲部５１，５２では、交差部５１ａ，５２ａが角度θの小さい第１交差部として構成され、交差部５１ｂ，５２ｂが交差部５１ａ，５２ａよりも角度θの大きい第２交差部として構成されていればよい。このため、第１交差部５１ａ，５２ａにおける角度θは、ゼロでなくてもよい。第２交差部５１ｂ，５２ｂにおける角度θは、湾曲部５１，５２の形状によって様々に変更可能である。 In the curved portions 51 and 52, the intersections 51a and 52a are configured as first intersections having a small angle θ, and the intersections 51b and 52b are configured as second intersections having a larger angle θ than the intersections 51a and 52a. It suffices if it has been done. Therefore, the angle θ at the first intersections 51a and 52a does not have to be zero. The angle θ at the second intersections 51b and 52b can be variously changed depending on the shape of the curved portions 51 and 52.

湾曲部５１，５２では、第１太溝部４１の変形を抑制する第１交差部５１ａ，５２ａがＸ軸方向後方に位置し、第２太溝部４２の変形を抑制する第２交差部５１ｂ，５２ｂがＸ軸方向前方に位置する。これにより、第２交差部５１ｂ，５２ｂから第１交差部５１ａに向けて後方に突出する後方突出部５１ｃ，５２ｃが形成される。このような構成により、吸収性コア２０では、更に第１太溝部４１が選択的に変形しやすくなる。 In the curved portions 51 and 52, the first intersections 51a and 52a that suppress the deformation of the first thick groove portion 41 are located rearward in the X-axis direction, and the second intersections 51b and 52b that suppress the deformation of the second thick groove portion 42. Is located forward in the X-axis direction. As a result, the rear protrusions 51c and 52c that project rearward from the second intersections 51b and 52b toward the first intersection 51a are formed. With such a configuration, in the absorbent core 20, the first thick groove portion 41 is more easily deformed selectively.

圧搾溝部５０では、複数の湾曲部５１，５２を設けることにより、各太溝部４１，４２のＸ軸方向に沿った複数箇所において剛性を高くすることができる。これにより、各太溝部４１，４２の剛性をＸ軸方向に沿って安定させることができる。また、圧搾溝部５０には、湾曲部５１，５２以外にも、第１交差部、第２交差部、及び後方突出部を有する湾曲部が設けられていてもよい。 By providing the plurality of curved portions 51 and 52 in the squeezed groove portion 50, the rigidity of each of the thick groove portions 41 and 42 can be increased at a plurality of locations along the X-axis direction. As a result, the rigidity of each of the thick groove portions 41 and 42 can be stabilized along the X-axis direction. Further, the squeezing groove portion 50 may be provided with a curved portion having a first intersecting portion, a second intersecting portion, and a rear protruding portion in addition to the curved portions 51 and 52.

図８Ｃには、第３湾曲部５３の交差部５３ａ，５３ｂを通り、Ｙ軸に平行な軸Ｃと、交差部５３ａ，５３ｂにおける第３湾曲部５３の接線Ｔと、が示されている。交差部５３ａ，５３ｂのいずれにおいても、軸Ｃと接線Ｔとが一致し、軸Ｃと接線Ｔとの成す角度θがゼロである。このため、第１太溝部４１と第２太溝部４２とで、第３湾曲部５３との交差面積が同等となる。 FIG. 8C shows an axis C that passes through the intersections 53a and 53b of the third curved portion 53 and is parallel to the Y axis, and a tangent T of the third curved portion 53 at the intersections 53a and 53b. At any of the intersections 53a and 53b, the axis C and the tangent line T coincide with each other, and the angle θ formed by the axis C and the tangent line T is zero. Therefore, the intersection area of the first thick groove portion 41 and the second thick groove portion 42 with the third curved portion 53 is the same.

したがって、第３湾曲部５３は、第１太溝部４１と第２太溝部４２とで剛性を異ならせる作用を有さない。つまり、後方部２３の中でも第３湾曲部５３が位置するＺ軸方向の後側の領域では、臀裂が浅くなっているため、第１太溝部４１の変形が小さくなる。このため、第３湾曲部５３が位置する領域では、第２太溝部４２の剛性を高めて、第１太溝部４１を選択的に変形させる必要性が低い。 Therefore, the third curved portion 53 does not have the effect of differentiating the rigidity between the first thick groove portion 41 and the second thick groove portion 42. That is, in the region on the rear side in the Z-axis direction where the third curved portion 53 is located in the rear portion 23, the intergluteal cleft is shallow, so that the deformation of the first thick groove portion 41 is small. Therefore, in the region where the third curved portion 53 is located, it is less necessary to increase the rigidity of the second thick groove portion 42 and selectively deform the first thick groove portion 41.

また、第１太溝部４１の変形を抑制する交差部５３ａがＸ軸方向前方に位置する第３交差部として構成され、第２太溝部４２の変形を抑制する交差部５３ｂがＸ軸方向後方に位置する第４交差部として構成される。第３湾曲部５３では、第４交差部５３ｂから第３交差部５３ａに向けて、湾曲部５１，５２の後方突出部５１ｃ，５２ｃとは反対に、Ｘ軸方向前方に突出する前方突出部５３ｃが形成される。 Further, the intersection 53a that suppresses the deformation of the first thick groove portion 41 is configured as a third intersection located in the front in the X-axis direction, and the intersection 53b that suppresses the deformation of the second thick groove portion 42 is located in the rear in the X-axis direction. It is configured as a located fourth intersection. In the third curved portion 53, the front protruding portion 53c projecting forward in the X-axis direction from the fourth intersection 53b toward the third intersection 53a, as opposed to the rear protruding portions 51c and 52c of the curved portions 51 and 52. Is formed.

圧搾溝部５０では、第３湾曲部５３の第３交差部５３ａ及び第４交差部５３ｂを設けることにより、太溝部４１，４２に対して、湾曲部５１，５２の第１交差部５１ａ，５２ａ及び第２交差部５１ｂ，５２ｂとは異なる変形のモードを付与することができる。これにより、吸収性コア２０の後方部２３における第３湾曲部５３よりもＸ軸方向前方の領域の変形状態を良好に維持することができる。 In the squeezing groove portion 50, by providing the third crossing portion 53a and the fourth crossing portion 53b of the third curved portion 53, the first crossing portions 51a and 52a of the curved portions 51 and 52 and the thick groove portions 41 and 42 are provided. A mode of deformation different from that of the second intersections 51b and 52b can be imparted. As a result, the deformed state of the region in front of the third curved portion 53 in the rear portion 23 of the absorbent core 20 in the X-axis direction can be maintained satisfactorily.

なお、必要に応じて、第３湾曲部５３によって、第１太溝部４１と第２太溝部４２との間の剛性に差をつけることもできる。つまり、第３湾曲部５３の後端部Ｐ（図６参照）の位置をＹ軸方向内側又は外側にずらすことにより、第３湾曲部５３と第２太溝部４２とを斜めに交差させることができる。これにより、第３湾曲部５３によっても、第２太溝部４２の剛性を第１太溝部４１よりも高くすることができる。 If necessary, the third curved portion 53 can make a difference in the rigidity between the first thick groove portion 41 and the second thick groove portion 42. That is, by shifting the position of the rear end portion P (see FIG. 6) of the third curved portion 53 inward or outward in the Y-axis direction, the third curved portion 53 and the second thick groove portion 42 can be obliquely intersected with each other. can. As a result, the rigidity of the second thick groove portion 42 can be made higher than that of the first thick groove portion 41 even by the third curved portion 53.

また、圧搾溝部５０は、第１湾曲部５１及び第２湾曲部５２の少なくとも一方を含んでいれば、第１太溝部４１を選択的に大きい変形の起点とする作用が得られる。このため、圧搾溝部５０では、第１湾曲部５１及び第２湾曲部５２のいずれか一方を省略することができる。また、圧搾溝部５０では、第３湾曲部５３を省略することもでき、また必要に応じて複数の第３湾曲部５３を設けることもできる。 Further, if the squeezed groove portion 50 includes at least one of the first curved portion 51 and the second curved portion 52, the action of selectively using the first thick groove portion 41 as the starting point of large deformation can be obtained. Therefore, in the squeezing groove portion 50, either one of the first curved portion 51 and the second curved portion 52 can be omitted. Further, in the squeezing groove portion 50, the third curved portion 53 can be omitted, and a plurality of third curved portions 53 can be provided as needed.

更に、圧搾溝部５０は、細溝部４３との交差数や交差角度などによって、細溝部４３の剛性を変化させることができる。しかしながら、剛性が低い細溝部４３では、太溝部４１，４２に比べて圧搾溝部５０によって剛性を微調整する必要性が低い。このため、圧搾溝部５０は、細溝部４３とは交差していなくてもよい。更に、圧搾溝部５０では、細溝部４３を省略することもできる。 Further, the squeezing groove portion 50 can change the rigidity of the narrow groove portion 43 depending on the number of intersections with the fine groove portion 43, the crossing angle, and the like. However, in the narrow groove portion 43 having low rigidity, it is less necessary to finely adjust the rigidity by the pressing groove portion 50 as compared with the thick groove portions 41 and 42. Therefore, the squeezed groove portion 50 does not have to intersect with the narrow groove portion 43. Further, in the squeezing groove portion 50, the narrow groove portion 43 can be omitted.

加えて、上述の実施形態では太溝部４１，４２の溝幅が略同じであったが、太溝部４１，４２に大きい剛性の差をつけるためには、太溝部４１，４２の溝幅に差異を設けることも可能である。しかしながら、上述の実施形態の圧搾溝部５０の構成は、太溝部４１，４２の溝幅に実質的な差異を設けることなく、容易に太溝部４１，４２に僅かな剛性の差をつけることができる点で好ましい。 In addition, in the above-described embodiment, the groove widths of the thick groove portions 41 and 42 are substantially the same, but in order to give a large difference in rigidity to the thick groove portions 41 and 42, the groove widths of the thick groove portions 41 and 42 are different. It is also possible to provide. However, in the configuration of the squeezed groove portion 50 of the above-described embodiment, a slight difference in rigidity can be easily added to the thick groove portions 41 and 42 without providing a substantial difference in the groove widths of the thick groove portions 41 and 42. It is preferable in terms of points.

［その他の実施形態］
以上、本発明の各実施形態について説明したが、本発明は上述の実施形態にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。例えば、本発明は、生理用ナプキン以外の吸収性物品に適用することも可能である。このような吸収性物品としては、例えば、失禁パット、おりものシート、使い捨ておむつなどが挙げられる。 [Other embodiments]
Although each embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention. For example, the present invention can also be applied to absorbent articles other than menstrual napkins. Examples of such absorbent articles include incontinence pads, vaginal discharge sheets, disposable diapers and the like.

１…ナプキン
１１…吸収体
２０…吸収性コア
２１…前方部
２２…中間部
２３…後方部
２４…高坪量部
４０…コア溝部
４１，４２…太溝部
４３…細溝部
５０…圧搾溝部
５１，５２，５３…湾曲部
５１ａ，５１ｂ，５２ａ，５２ｂ，５３ａ，５３ｂ…交差部
５１ｃ，５２ｃ…後方突出部
５３ｃ…前方突出部
６０…窪み部 1 ... Napkin 11 ... Absorber 20 ... Absorbent core 21 ... Front part 22 ... Middle part 23 ... Rear part 24 ... High basis weight part 40 ... Core groove part 41, 42 ... Thick groove part 43 ... Fine groove part 50 ... Squeezing groove part 51, 52, 53 ... Curved portions 51a, 51b, 52a, 52b, 53a, 53b ... Crossing portions 51c, 52c ... Rear protruding portion 53c ... Front protruding portion 60 ... Depressed portion

Claims

It includes an absorbent core having an anterior portion, an intermediate portion, and a rear portion arranged in the longitudinal direction, a surface sheet arranged on the absorbent core, and a squeezing groove portion extending from the surface sheet side to the absorbent core. It ’s an absorbent article,
The absorbent core is provided in the rear portion along the longitudinal direction, and has a first thick groove portion located in the central portion in the width direction and a pair of first thick groove portions located on both sides of the first thick groove portion in the width direction. It further has a core groove portion including two thick groove portions and a fine groove portion located outside the width direction of the pair of second thick groove portions and thinner than the first thick groove portion and the pair of second thick groove portions. death,
The squeezed groove portion includes a first intersection portion that intersects with the first thick groove portion and a pair of second intersections that intersect with the pair of second thick groove portions, and has an axis extending in the width direction. An absorbent article having a curved portion in the pair of second intersections having a larger angle than the first intersection.

The absorbent article according to claim 1, wherein the curved portion further includes a rear protruding portion that protrudes rearward from the pair of second intersections toward the first intersection.

The absorbent article according to claim 2, wherein the squeezed groove portion has a plurality of curved portions including the rear protruding portion.

The squeezed groove portion is located behind the rear protrusions of the plurality of curved portions, and has a third intersection that intersects with the first thick groove portion and a pair of fourth intersections that intersect with the pair of second thick groove portions. The absorbent article according to claim 3, further comprising a curved portion including a portion and a forward projecting portion projecting forward from the pair of fourth intersections toward the third intersection.

The absorbent article according to any one of claims 1 to 4, wherein the squeezed groove portion intersects the fine groove portion.

The absorbent core is provided in the central portion in the width direction of the intermediate portion, and further has a high basis weight portion having a basis weight higher than that of the front portion and the rear portion.
The absorbent article according to any one of claims 1 to 5, wherein at least a part of the pair of second thick grooves faces the high basis weight portion in the longitudinal direction.