WO2019116953A1

WO2019116953A1 - Absorbent article

Info

Publication number: WO2019116953A1
Application number: PCT/JP2018/044463
Authority: WO
Inventors: 幸江加藤; 耕裕山本; 祐一廣瀬
Original assignee: 花王株式会社
Priority date: 2017-12-14
Filing date: 2018-12-04
Publication date: 2019-06-20
Also published as: CN111372546A; JP6578341B2; JP2019103709A; CN111372546B

Abstract

An absorbent article comprising an absorbent core and a core wrap sheet. The absorbent core has: a front core section and a rear core section that are positioned on both ends in the longitudinal direction; and a narrow intermediate core section formed between a pair of narrow regions, in an intermediate section in the longitudinal direction. The intermediate core section includes: a high-basis-weight section formed in the center in the width direction; and a pair of low-basis-weight sections having a lower basis weight than the high-basis-weight section and being formed around the high-basis-weight section. The core wrap sheet has: a core-covering section that covers the absorbent core; and pair of narrow covering sections that cover the pair of narrow regions.

Description

Absorbent articles

The present invention relates to absorbent articles such as sanitary napkins.

An absorbent article of the type used on the inner side of an undergarment, such as a sanitary napkin, includes an absorbent for absorbing a liquid such as menstrual blood. The absorbent body has a core wrap sheet, a surface sheet, and the like covering the absorbent core, in addition to the absorbent core elongated in the front-rear direction. For example, Patent Document 1 discloses an absorbent article in which a protrusion for enhancing the fit to the excretory area is provided in the central area of the absorbent core opposed to the excretory area of the wearer.

JP, 2014-104093, A

An absorbent article according to an aspect of the present invention comprises an absorbent core and a core wrap sheet.
The absorbent core includes a front core portion and a rear core portion positioned on both end sides in the longitudinal direction, and the front core portion and the rear core portion formed between the pair of constricted regions in the longitudinal middle portion. It has an intermediate core portion narrower than that. The intermediate core portion has a high basis weight portion formed in the center in the width direction, and a pair of low basis weight portions having a basis weight lower than that of the high basis weight portion and formed around the high basis weight portion. Including.
The core wrap sheet has a core covering portion that covers the absorbent core, and a pair of necking portions that covers the pair of necking regions.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the absorbent article which concerns on one Embodiment of this invention. It is a top view of the above-mentioned absorptive article. FIG. 3 is a cross-sectional view taken along line III-III in FIG. It is a top view which shows the absorptive core of the said absorbent article. It is sectional drawing which shows the absorber of the said absorbent article typically. It is a schematic cross section of the said absorber. It is a principal part top view explaining the narrow covering part in the above-mentioned absorber. It is sectional drawing which shows typically the other structural example of the said absorber. It is sectional drawing which shows typically the other structural example of the said absorber. It is a top view which shows typically the other structural example of the high basic weight part in the said absorptive core. It is a top view which shows typically the other structural example of the high basic weight part in the said absorptive core. It is a top view which shows typically the other structural example of the front-end | tip shape of the said high basis weight part.

Detailed Description of the Invention

Absorbent articles, such as sanitary napkins, typically have a width that is greater than the crotch width of a person. For this reason, when an external force directed inward in the width direction from the left and right outside is applied at the time of wearing, deformation occurs such that the fit with the excretory area is reduced in the central region of the absorbent core, and liquid leakage easily occurs. Therefore, a technique for suppressing the deformation of the central region of the absorbent core against external force is desired.

The present invention relates to an absorbent article capable of suppressing deformation of the central region of the absorbent core.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the drawings, mutually orthogonal X-axis, Y-axis and Z-axis are shown.

[Whole composition of the napkin]
FIG. 1 is a perspective view showing an absorbent article 1 according to an embodiment of the present invention. In FIG. 1, the X-axis direction corresponds to the front-rear direction, the Y-axis direction corresponds to the left-right direction, and the Z-axis direction corresponds to the vertical direction.
FIG. 2 is a plan view (or a developed view) of the absorbent article 1 and shows a mode in which the absorbent article 1 shown in FIG. 1 is stretched along the XY plane. In the absorbent article 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. Hereinafter, the absorbent article 1 is demonstrated in the aspect shown in FIG.

The absorbent article 1 of the present embodiment is configured as a sanitary napkin and hereinafter referred to as a napkin 1.
The napkin 1 may be used at bedtime, and may have a length of, for example, 30 cm or more along the longitudinal direction.

In the embodiment, the napkin 1 includes a main body M, a pair of wing portions W, a pair of side guards G, and a pair of rear flap portions F.

The main body M has a front area M1, an intermediate area M2, and a rear area M3 sectioned along the longitudinal direction.
The front area M1 is an area disposed in front of the middle area M2 (venter side of the wearer), and is configured to face the front side (abdomen) of the excretory area of the wearer at the time of wearing.
The middle area M2 is configured to face the excretory area at the time of wearing. In the case of a napkin having a wing portion, a region in the longitudinal direction X overlapping the entire length of the wing portion is an intermediate region M2. In the case of the napkin which does not have a wing part, let the area | region of the center when the full length of a napkin is equally divided into 3 be the intermediate | middle area | region M2. The intermediate region M2 may be located closer to the front of the main body M as illustrated, or may be located at the central portion of the main body M.
The rear region M3 is a region disposed on the rear side (the dorsal side of the wearer) of the middle region M2, and is configured to face the rear side (the buttocks) of the excretory region when worn.

The wing portion W is configured to largely protrude outward in the width direction from the middle region M2.
The side guard G is arranged to extend in the longitudinal direction at the widthwise peripheral edge of the main body M including the intermediate region M2. The side guard G stands up in the thickness direction during mounting, and prevents the liquid from leaking in the width direction.
The rear flap portion F is configured to bulge outward in the width direction from the rear region M3.
The napkin 1 may not have at least one of the wing portion W, the side guard G, and the rear flap portion F.

[Configuration of each part of the napkin]
FIG. 3 is a cross-sectional view taken along line III-III of FIG.
The napkin 1 includes an absorbent body 11, a top sheet 12, a back sheet 13, a pair of side sheets 14, an adhesive portion 15, and a pressing groove 16. In the main body M, the napkin 1 has a configuration in which the back sheet 13, the absorber 11, and the top sheet 12 are stacked.

The absorber 11 has a longitudinal direction in the X-axis direction, and is disposed at the central portion in the thickness direction of the napkin 1. The absorber 11 absorbs a liquid substance such as menstrual blood of the wearer (hereinafter, also referred to as “liquid”) from the surface on the surface sheet 12 side, and diffuses the inside to hold the liquid.

The absorbent body 11 has an absorbent core 20 and a core wrap sheet 30.
The absorbent core 20 has a function to absorb and hold a liquid. The absorbent core 20 may be formed of, for example, a fiber assembly composed of hydrophilic fibers such as pulp fibers, or may have a configuration in which a water absorbing polymer is held by the fiber assembly. .
The core wrap sheet 30 covers the absorbent core 20 and has, for example, a function of holding the shape of the absorbent core 20. The core wrap sheet 30 is formed of, for example, thin soft paper such as tissue paper, liquid-permeable non-woven fabric, or the like.
The details of the absorber 11 will be described later.

The surface sheet 12 is configured as a liquid-permeable sheet material and disposed on the absorber 11. The top sheet 12 constitutes the outer surface of the main body M above the napkin 1 in the thickness direction.

The back sheet 13 is disposed to face the top sheet 12 in the thickness direction with the absorber 11 interposed therebetween. The back sheet 13 constitutes the outer surface below the napkin 1 in the thickness direction. The back sheet 13 is joined to the top sheet 12 and the side sheet 14 by, for example, an adhesive, heat sealing, or the like at the peripheral portion.

The pair of side sheets 14 oppose each other in the width direction with the top sheet 12 interposed therebetween, and are disposed at the widthwise peripheral edge of the napkin 1. The side seat 14 constitutes a side guard G. The side guard G has a side guard configuration portion 141 and a front sheet joint portion 142.
The side guard component 141 is disposed at the widthwise peripheral edge of the main body M. The side guard configuration portion 141 includes an elastic member 141 a such as a thread-like elastic member disposed along the longitudinal direction between the folded portion of the side sheet 14 folded back outward in the width direction and the surface sheet bonding portion 142. And, it is configured to be able to stand on the skin surface side.
The surface sheet bonding portion 142 is disposed in a region facing the widthwise peripheral edge of the surface sheet 12, and bonds the side sheet 14 and the surface sheet 12 in the thickness direction (Z-axis direction).

The adhesive portion 15 is a structure for fixing the napkin 1 to the undergarment, and is formed on the outer surface of the back sheet 13. The adhesive unit 15 includes, for example, a main unit adhesive unit 151 provided on the main body M, a wing adhesive unit 152 provided on the wing unit W, and a rear flap adhesive unit (not shown) provided on the rear flap unit F.

The squeeze groove 16 is configured as a linear groove formed by squeezing the absorbent body 11 (the absorbent core 20 and the core wrap sheet 30) and the surface sheet 12. The pressing groove 16 is configured to go around the main body M as shown in FIGS. The squeeze groove 16 can induce deformation to a shape that fits the wearer at the time of wearing, and can enhance the effect of preventing liquid leakage outward in the width direction and longitudinal direction of the napkin 1.

Next, details of each part will be described.

(Basic composition of absorber)
The absorbent body 11 includes the absorbent core 20 and the core wrap sheet 30 as described above.

FIG. 4 is a plan view showing the surface 20A of the absorbent core 20. As shown in FIG.
The absorbent core 20 has a front core portion 21 located in the front region M1, an intermediate core portion 22 located in the middle region M2, and a rear core portion 23 located in the rear region M3. The front core portion 21 and the rear core portion 23 are located at both ends in the longitudinal direction of the absorbent core 20, and the intermediate core portion 22 is located between the front core portion 21 and the rear core portion 23. The intermediate core portion 22 extends from the rear side of the front area M1 to the front side of the rear area M3 via the intermediate area M2. The absorbent core 20 has a planar shape that is symmetrical in the lateral direction.

In FIG. 4, widths D1, D2, and D3, which are dimensions in the width direction of the front core portion 21, the intermediate core portion 22, and the rear core portion 23, are shown. The width D2 of the intermediate core portion 22 is smaller than both the width D1 of the front core portion 21 and the width D3 of the rear core portion 23. That is, the absorbent core 20 has an intermediate core portion 22 which is narrower than the front core portion 21 and the rear core portion 23 and is formed between the pair of constricted regions 22s at the longitudinal middle portion.

In the present embodiment, the width D1 of the front core portion 21 and the width D3 of the rear core portion 23 are the same. However, the width D1 of the front core portion 21 and the width D3 of the rear core portion 23 may be different. Further, the widths of the front core portion 21, the intermediate core portion 22 and the rear core portion 23 may not be uniform. In this case, the maximum dimension in the width direction of each of the front core portion 21 and the rear core portion 23 can be set to the widths D1 and D3, and the minimum dimension in the width direction of the intermediate core portion 22 can be set to D2.

In the case of a sanitary napkin, the widths D1 and D3 of the front core portion 21 and the rear core portion 23 are, for example, 60 mm or more and 100 mm or less, preferably 70 mm or more and 90 mm or less.
The thickness of the front core portion 21 and the rear core portion 23 is preferably 2 mm or more and 10 mm or less, more preferably 2.5 mm or more and 9 mm or less. The basis weight of the front core portion 21 and the rear core portion 23 is preferably 90 g / m ² or more and 500 g / m ² or less, more preferably 100 g / m ² or more and 450 g / m ² or less.
In the case where the absorbent core has a groove as in the present embodiment, the thickness and basis weight of each core portion refer to the thickness and basis weight in the portion excluding the groove (that is, the block portion). . Hereinafter, the thickness and basis weight of the absorbent core are the same as described above unless otherwise specified.

The width D2 of the intermediate core portion 22 is typically larger than the crotch width (about 30 mm) of a general wearer, and is, for example, 40 mm or more and 75 mm or less, preferably 50 mm or more and 70 mm or less. As a result, it becomes difficult to receive the influence of the external force directed inward in the width direction added by the legs of the wearer, etc., and it becomes possible to cope with the mounting position deviation in the width direction, giving a sense of security to the wearer. it can. In addition, it is preferable that the width | variety in the longitudinal direction full length of the intermediate | middle core part 22 is in the range mentioned above except

taper part

22a, 22b.

The length in the longitudinal direction of the intermediate core portion 22 is, for example, 60 mm or more and 180 mm or less, preferably 80 mm or more and 170 mm or less. Thereby, even when there is a mounting position deviation in the longitudinal direction or the like, the intermediate core portion 22 can be opposed to the excretory area of the wearer.

As shown in FIG. 4, the intermediate core portion 22 has tapered

portions

22 a and 22 b at the front end and the rear end of both edges thereof. The

tapered portions

22 a and 22 b increase the width of the intermediate core portion 22 toward the front core portion 21 and the rear core portion 23. The constricted region 22s corresponds to a space formed between both edges of the intermediate core portion 22 and the

tapered portions

22a and 22b.

The intermediate core portion 22 includes a high basis weight portion 24 and a low basis weight portion 25 having a basis weight lower than that of the high basis weight portion 24. In FIG. 4, the high basis weight portion 24 is shown by a dense dot pattern, and the low basis weight portion 25 is shown by a rough dot pattern.

The high basis weight portion 24 is formed at the center in the width direction of the intermediate core portion 22. The high basis weight portion 24 is disposed to face the excretory area of the wearer when the napkin 1 is attached. The low basis weight portion 25 is formed around the high basis weight portion 24. In addition, a "surroundings" means the area | region containing the width direction outer side of the high basis weight part 24 at least here. The low basis weight portion 25 is preferably present at least in the middle region M2 of the napkin 1.
The high basis weight portion 24 has a longitudinal shape in the front-rear direction, and the maximum width thereof is, for example, 15 mm or more and 60 mm or less, preferably 20 mm or more and 50 mm or less. By making the said width | variety into such a range, the fit property to a wearer's excretion area can be improved, and sufficient absorption can be ensured.
The high basis weight portion 24 is formed to be thicker than the low basis weight portion 25 (see FIG. 3) and protrudes upward in the thickness direction (on the surface sheet 12 side). Thereby, a good fit is secured between the central area of the middle area M2 of the napkin 1 corresponding to the high basis weight portion 24 and the excretory area of the wearer.

The basis weight of the high basis weight portion 24 is, for example, 400 g / m ² or more and 1000 g / m ² or less, preferably 500 g / m ² or more and 900 g / m ² or less.
The basis weight of the low basis weight portion 25 is, for example, 100 g / m ² or more and 700 g / m ² or less, preferably 200 g / m ² or more and 600 g / m ² or less.

The thicknesses of the high basis weight portion 24 and the low basis weight portion 25 can be set in consideration of the basis weight.
The thickness in the Z-axis direction of the high basis weight portion 24 is, for example, 3 mm or more and 15 mm or less, and preferably 5 mm or more and 13 mm or less.
The thickness of the low basis weight portion 25 in the Z-axis direction is, for example, 2 mm or more and 12 mm or less, preferably 3 mm or more and 10 mm or less.

As a method of measuring the basis weight of the absorbent core, the measurement target region of the absorbent core 20 is cut using a feather razor manufactured by Feather Co., and pieces are obtained so as to have a predetermined area. The weight of the small pieces is measured using an electronic balance (electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point). The weight determined is divided by the area of the small pieces of each part to calculate the basis weight of the small pieces. For each part, the average of the basis weight of 5 pieces is taken as the basis weight.

The thickness of the absorber 11 to be measured is measured by measuring the thickness of small pieces cut out to measure the basis weight for each part. The measurement part of the small piece cut out from the absorbent article is pressurized at a pressure of 5 kPa for 10 minutes, and measurement is performed immediately after the weight is removed. Place an acrylic plate with a size of 20 mm × 20 mm and a thickness of 3 mm on the absorber 3 in the central area of the sample after unloading, and contact KEYENCE non-contact laser displacement meter (laser head LK-G30, displacement meter LK- The thickness of the sample is measured using GD 500. When the size of the cut-out piece is small and it is difficult to measure with a non-contact laser displacement meter, a cross section of the cut sample is, for example, a microscope (KEYENCE, Inc.) The product may be observed and measured at a magnification of 20 to 100 using VHX-1000 manufactured by H.K.

The surface 20A of the absorbent core 20 is formed of a three-dimensional structural surface which faces the top sheet 12 and further has peripheral groove portions 26, longitudinal groove portions 27, lateral groove portions 28 and the like. The back surface 20B of the absorbent core 20 faces the back sheet 13, and is typically formed of a flat surface.
The details of the peripheral groove 26, the longitudinal groove 27 and the lateral groove 28 will be described later.

FIG. 5 is a schematic plan view of the absorber 11 in the single state. FIG. 6 is a schematic view of the absorbent body 11 conceptually showing the relationship between the absorbent core 20 and the core wrap sheet 30, and corresponds to a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a plan view of relevant parts for explaining the constriction covering portion 34 in the absorbent body 11. In FIG. 6, illustration of the longitudinal grooves and the like formed on the surface 20A of the absorbent core 20 is omitted.

The core wrap sheet 30 is wound in the width direction of the absorbent core 20 so as to cover the front and back of the absorbent core 20. The length along the X-axis direction of the core wrap sheet 30 is formed to be equal to the length (total length) of the absorbent core 20 in the front-rear direction, but not limited to this, it is longer than the entire length of the absorbent core 20 It may be short or short.

As the core wrap sheet 30, as described above, paper, non-woven fabric and the like can be used.
The core wrap sheet 30 may be composed of a single sheet material or may be composed of a plurality of sheet materials. The core wrap sheet 30 may be joined to the top sheet 12 and the back sheet 13 by, for example, an adhesive coated in a predetermined pattern.

The core wrap sheet 30, as shown in FIGS. 6 and 7, includes a core covering portion (31 to 33) for covering each part of the absorbent core 20 and a pair of core coverings for covering a pair of constricted regions 22s of the absorbent core 20. And a neck portion 34.
The core coating includes a front core coating 31 that covers the front core 21, an intermediate core coating 32 that covers the intermediate core 22, and a rear core coating 33 that covers the rear core 23. In FIG. 5, the boundary between each of the core coating portions 31 to 33 and the narrow portion coating portion 34 is indicated by an alternate long and short dash line.

The core wrap sheet 30 is made of a sheet material having a sufficiently lower rigidity than the absorbent core 20, and thus covers the absorbent core 20 in a shape corresponding to the shape of the absorbent core 20. For example, as shown in FIG. 6, the intermediate core covering portion 32 is deformed to a shape corresponding to the shape of the raised portion (high basis weight portion 24) of the surface 20A of the intermediate core portion 22.

On the other hand, the narrow portion covering portion 34 extends from the outer edge portion of the intermediate core portion 22 to the narrow portion 22 s by being bridged between the front core portion 21 and the rear core portion 23. For this reason, the constricted covering portion 34 is maintained in a shape corresponding to the constricted region 22s in a state where a constant tension is applied in the front-rear direction.

Although there is no core material constituting the absorbent core 20 inside the constricted covering 34 as shown in FIG. 6, the core material is separated from the fibers protruding outward from the periphery of the absorbent core 20 or from the absorbent core 20. A portion of the core material may be partially present. In addition, although the narrow covering portion 34 is drawn in FIG. 6 so as to have the same thickness as the low basis weight portion 25 of the absorbent core in the thickness direction Z, as shown in FIG. There is almost no space in the thickness direction, and preferably, the front surface area 341 and the back surface area 342 are in contact with each other.

(Typical action of absorber)
In the absorber 11 configured as described above, the high basis weight portion 24 has rigidity higher than that of the low basis weight portion 25, and the low basis weight portion 25 has rigidity higher than that of the narrow covering portion 34. For this reason, the middle region M2 of the absorber 11 to which the middle core portion 22 belongs is divided into a plurality of regions in which the rigidity gradually decreases outward from the center in the width direction. Thereby, even when an external force is applied from the left and right outside, the external force is sufficiently relaxed in the constricted covering portion 34 and the low basis weight portion 25 adjacent thereto, and it is difficult to propagate to the high basis weight portion 24. It is possible to effectively suppress the deformation in the quantitative portion 24.

For example, when the wearer walks, travels, or sleeps, the intermediate region M2 of the napkin 1 constantly receives an external force directed inward in the width direction from both legs of the wearer outside in the width direction. As described above, the absorber 11 is configured so that the rigidity gradually decreases outward from the center in the width direction. For this reason, when external force is received from both the left and right sides, typically, the pair of narrowed covering portions 34 are deformed first, and then the low basis weight portion 25 is further deformed. Thereby, the external force which acts on the absorber 11 is absorbed or relieved stepwise.

In particular, when external force is applied from both the left and right sides, the pair of narrowed covering portions 34 generate a predetermined tensile force in the front-rear direction, and this acts as a reaction force against external force (compression deformation resistance in the width direction). As a result, the buffer effect against external force is enhanced, and the deformation of the low basis weight portion 25 is further suppressed, so the external force propagating to the high basis weight portion 24 is reduced, and thus the deformation of the high basis weight portion 24 is effectively suppressed. . As a result, the stable fit of the intermediate area M2 with the wearer's excretory area is maintained, so that the occurrence of liquid leakage due to the deformation of the napkin 1 is prevented.

In particular, when the wing W is provided as in the case of the napkin 1, since the wing is folded and attached to the crotch portion of the shorts, the followability of the napkin 1 to the movement in the wearer's crotch tends to be high. . In such a case, having the intermediate core portion 22 so as to overlap with the wing W in the longitudinal direction is very useful.

The magnitude of the resistance of the neck portion 34 to external force is the rigidity of the front core portion 21 and the rear core portion 23, the length of the outer edge line L1 (see FIG. 5) of the neck portion 34, and the outer edge line L1 in the neck region 22s. It can be appropriately set according to the position, the rigidity of the core wrap sheet 30, and the like.

(Bundled covering)
The outer edge line L1 of the neck portion 34 corresponds to the edge of the core wrap sheet 30. Therefore, for example, as shown in FIG. 7, the outer edge line L1 of each of the pair of neck covering portions 34 is a virtual line connecting outer edge portions P1 and P2 of the front core portion 21 and the rear core portion 23 in each of the pair of neck regions 22s. A bisector line L4 of a line segment parallel to the width direction connecting L2 and an outer edge line L3 corresponding to the outer edge portion of the intermediate core portion 22 (an outer edge line L2 passing the middle point M of the line segment parallel to the width direction , L3), which are respectively positioned outward in the width direction.
As a result, the neck portion 34 has a width sufficient to allow its deformation, and therefore, the neck portion using the rigidity of the front core portion 21 and the rear core portion 23 located before and after it. The shock absorbing effect of the external force by the compressive deformation resistance in the width direction of 34 can be enhanced, and the deformation suppressing effect of the high basis weight portion 24 can be enhanced.

In order to further secure the above-described effects, the core wrap sheet 30 is preferably non-stretchable or hardly stretchable. Here, non-elongation or difficult-to-elongate means that the elongation when a tensile load is applied to the sheet is low, specifically, the elongation when a 1-N load is applied to a 50 mm wide sheet is 25% It is preferable that it is the following.

Outer edge portions P1 and P2 of the front core portion 21 and the rear core portion 23 correspond to a narrowing start point of the absorbent core 20 serving as a base point of the narrowing region 22s, for example, the front core portion 21 and the rear core portion 23 and the middle core portion 22. It corresponds to the boundary between the

tapered portions

22a and 22b. The

tapered portions

22a and 22b are not limited to the linear shape, and may have a curved shape that is convex toward the constricted region 22s. The

tapered portions

22a and 22b may be omitted. In this case, the intermediate core portion 22 is connected to the front core portion 21 and the rear core portion 23 via a step perpendicular to the front-rear direction.

The outer edge line L1 of the neck covering portion 34 is not limited to extending linearly at the outer edge portions P1 and P2, and a partially bent (or curved) region may be formed in the neck start area.
The outer edge line L1 of the narrowed covering portion 34 can be adjusted, for example, by the magnitude of tension in the width direction (Y-axis direction) of the core wrap sheet 30 when the core wrap sheet 30 is wound around the absorbent core 20.

On the other hand, the cushioning effect of external force by the constriction covering portion 34 can also be enhanced by the form of the core wrap sheet 30 forming the constricting covering portion 34.
For example, as shown in FIG. 8, the pair of neck covering portions 34 have a front side area 341 and a back side area 342 that sandwich the neck area 22 s in the thickness direction. In the present embodiment, the pair of narrowed covering portions 34 face each other without being bonded to each other in the thickness direction of the absorbent core 20. That is, the front side area 341 and the back side area 342 face each other in the thickness direction without their inner surfaces being joined by means such as adhesion with a bonding material or thermocompression bonding.
As a result, the rigidity of the constricted covering portion 34 is made uniform, and the front side region 341 and the back side region 342 can be freely deformed without being restricted to each other, so that the entire constricted covering portion 34 is deformed flexibly. Thus, the buffer effect against external force can be enhanced.

Furthermore, in the present embodiment, the front side area 341 and the back side area 342 are formed continuously with each other at the peripheral edge portion (outer edge) of the pair of narrowed covering portions 34 in the width direction. That is, the front side area 341 and the back side area 342 are formed of the common sheet material folded back at the constricted area 22.
As a result, the rigidity of the entire narrow covering portion 34 is enhanced, and the shock absorbing effect against external force is enhanced.

(Low basis weight)
In order to further enhance the external force cushioning effect of the low basis weight portion 25, the low basis weight portion 25 may be provided with a plurality of regions having different densities. FIG. 8 is a schematic cross-sectional view of an absorber 11A having a low basis weight portion 25 of such a structure.

As shown in FIG. 8, in the absorbent core 20, the low basis weight portion 25 includes a side end portion 251 and a high density portion 252. The side end portion 251 is located outward in the width direction of the high basis weight portion 24. The high density portion 252 has a higher density than the side end 251 and is located between the side end 251 and the high basis weight portion 24. Since the high density portion 252 has a basis weight lower than that of the high basis weight portion 24, the rigidity of the intermediate core portion 22 becomes higher in the order of the side end portion 251, the high density portion 252 and the high basis weight portion 24.
Thus, by gradually increasing the rigidity of the low basis weight portion 25 from the side end portion 251 toward the high basis weight portion 24, it is possible to reliably deform from a region farther from the high basis weight portion 24. That is, it is possible to avoid simultaneous deformation of the entire low basis weight portion 25 when receiving an external force. Thereby, the deformation preventing effect of the high basis weight portion 24 can be further enhanced.

The method for providing the high density portion 252 in the low basis weight portion 25 is not particularly limited. For example, the basis weight may be larger than the side end portion 251 or the region between the side end portion 251 and the high basis weight portion 24 may be The high density portion 252 can be formed by compressing in the thickness direction. The high density portion 252 does not have to be provided adjacent to the high basis weight portion 24, and a region of lower density than the high density portion 252 may be interposed therebetween.

The absorbent core 20 may also be provided with a pressing groove 16 integrally with the topsheet 12 and the core wrap sheet 30 so as to overlap the high density portion 252 in plan view. FIG. 9 shows a cross-sectional view of an absorber in which the compressed grooves 16 are provided in the high density part. In the absorber of FIG. 9, the low basis weight portion 25 has a side end portion 251 and a first high density portion 253 and a second high density portion 254 which are higher in density than the side end portion 251. The first high density portion 253 is formed between the side end portion 251 and the high basis weight portion 24. The second high density portion 254 is formed between the first high density portion 253 and the high basis weight portion 24. In the embodiment of FIG. 9, the first high density portion 253 has a higher density than the second high density portion 254. Also, the thickness is smaller than the side end portion 251 and the second high density portion 254.
The first high-density portion 253 may be provided at a position corresponding to the formation position of the compressed groove 16 on the main body M (see FIG. 3). Thereby, the high density part 253 can be formed in the low basis weight part 25 simultaneously with the formation of the pressing groove 16.

(Shape of high basis weight part)
Since the intermediate core portion 22 constitutes the intermediate region M2 of the napkin 1 facing the wearer's excretory region, the external force directed inward in the width direction is the largest. Thus, in the present embodiment, the high basis weight portion 24 is formed at least over the entire length of the intermediate core portion 22 (see FIG. 4).
Thereby, when the napkin 1 is attached, a good fit between the high basis weight portion 24 and the excretory area can be secured.
In addition, a low basis weight region (low basis weight portion 25) whose basis weight is lower than that of the high basis weight portion 24 is avoided from being present over the entire width direction of the intermediate core portion 22. The deformation suppressing effect of the high basis weight portion 24 based on the rigidity difference in the width direction as described above can be secured.

As shown in FIGS. 10A and 10B, the total length of the high basis weight portion 24 may be larger than the total length of the intermediate core portion 22. Thereby, the rigidity difference of the width direction over the whole field of middle core part 22 is stably securable. In addition, even when positional deviation between the intermediate area M2 and the excretory area occurs in the longitudinal direction when the napkin 1 is attached, a good fit between the high basis weight portion 24 and the excretable area can be secured. .

Here, in the example of FIGS. 10A and 10B, the front end portion 241 and the rear end portion 242 of the high basis weight portion 24 are extended to the front core portion 21 and the rear core portion 23, respectively. Only one of 241 and the rear end portion 242 may be extended to the front core portion 21 or the rear core portion 23.
On the other hand, the total length of the low basis weight portion 25 may be the same as the total length of the intermediate core portion 22 as shown in FIG. 10A, or as shown in FIG. 10B. You may

Further, as shown in FIGS. 11A and 11B, the high basis weight portion 24 may be generally formed to be biased toward the front core portion 21 side or the rear core portion 22 side. Since the high basis weight portion 24 has a total length equal to or greater than the entire length of the intermediate core portion 22, a good fit between the high basis weight portion 24 and the excretory area can be ensured when the napkin 1 is attached. .

When the high basis weight portion 24 extends from the intermediate core portion 22 to at least one of the front core portion 21 and the rear core portion 23 as in the embodiments of FIGS. 10 and 11, the length of the extended portion In the front core portion 21, the length of the rear core portion 23 is 30% or less, and further 20% or less of the length of the front core portion 21. It is preferable that 20% or less, further 10% or less is obtained in order to obtain a good wearing feeling and a feeling of fit.

Furthermore, in the present embodiment, the longitudinal end (the front end 241 and the rear end 242) of the high basis weight portion 24 has a shape in which the width gradually decreases toward the front end (see FIG. 4).
As a result of the front end portion 241 and the rear end portion 242 approaching the front core portion 21 and the rear core portion 23, the

respective end portions

241, 242 are susceptible to external force not only in the width direction but also in the longitudinal direction or a direction intersecting it. Even if it becomes, the external force can be effectively released by making the tip tapered. Thereby, the deformation of the high basis weight portion 24 can be hardly caused.

The front end portion 241 and the rear end portion 242 are typically formed in a generally semicircular shape (see FIG. 4), but, as schematically shown in FIGS. The shape is not particularly limited as long as it is a shape that can disperse external force acting in a plane, such as a combination shape with a straight line.
As the deformation preventing effect of the high basis weight portion 24, for example, the case where the front end portion 241 and the rear end portion 242 are semicircular (FIG. 4) or triangular (FIG. 12A) is more preferable.

(Relationship between rigidity of middle core portion and rigidity of front and rear core portions)
The absorbent core 20 has the front core portion 21, the intermediate core portion 22, and the rear core portion 23 as described above. The basis weight of the front core portion 21 and the rear core portion 23 is not particularly limited, but in the present embodiment, the front core portion 21 and the rear core portion 23 have a basis weight lower than that of the low basis weight portion 25.
Thereby, the rigidity of the intermediate core portion 22 is enhanced more than that of the front core portion 21 and the rear core portion 23, and therefore the influence of the deformation or the like of the front core portion 21 and the rear core portion 23 becomes difficult. And the attitude can be held stable.

Further, since the front core portion 21 and the rear core portion 23 are lower in rigidity and easier to deform than the intermediate core portion 22, external forces applied to the napkin 1 in the front-rear direction are buffered in the front core portion 21 and the rear core portion 23. The deformation of the intermediate region M2 (intermediate core portion 22) facing the excretion region can be suppressed.

In particular, in the napkin 1 of the present embodiment in which the rear core portion 23 has a relatively large area, the behavior of the rear core portion 23 has a great influence on the posture of the intermediate core portion 22. For this reason, configuring the intermediate core portion 22 with rigidity higher than that of the rear core portion 23 is very advantageous in securing stable mountability of the intermediate core portion 22 at bedtime and the like.

In the case where the high basis weight portion 24 extends to the front core portion 21 or the rear core portion 23 as shown in FIGS. 10 and 11, the basis weight of the low basis weight portion 25 and the front core portion 21 or the rear portion 2 The basis weight of the part 42 is compared as follows.
In the case where the high basis weight portion 24 extends to the front core portion 21, the basis weight of the area forward of the front end portion 241 is the basis weight of the front core portion 21 with the front end portion 241 of the high basis weight portion 24 as a boundary. This basis weight is compared with the basis weight of the low basis weight portion 25. Similarly, in the case where the high basis weight portion 24 extends to the rear core portion 23, the basis weight of the region behind the rear end portion 242 is set to the rear core with the rear end portion 242 of the high basis weight portion 24 as a boundary. It is defined as the basis weight of the part 23 and this basis weight is compared with the basis weight of the low basis weight part 25.

(Peripheral groove)
As described above, the intermediate core portion 22 is provided with the peripheral groove portion 26, the longitudinal groove portion 27 and the lateral groove portion 28.

The peripheral groove portion 26 is formed between the high basis weight portion 24 and the low basis weight portion 25 so as to surround at least the periphery of the high basis weight portion 24 in the longitudinal direction (see FIG. 4).
In the present embodiment, the peripheral groove portion 26 is formed along the outer edge of the high basis weight portion 24. The peripheral groove portion 26 is formed at a basis weight lower than that of the low basis weight portion 25. Thereby, since the deformation around the high basis weight portion 24 is absorbed by the peripheral groove portion 26, it becomes difficult for the deformation of the low basis weight portion 25 to be transmitted to the high basis weight portion 24 and accordingly the high basis weight portion 24 is deformed around it. It is hard to receive the influence of and can secure the deformation control effect.

The longitudinal grooves 27 extend along the longitudinal direction of the absorbent core 20, and are arranged at intervals along the width direction (see FIG. 4). The longitudinal groove portion 27 is formed on each of the front core portion 21, the intermediate core portion 22 and the rear core portion 23 over substantially the entire length in the longitudinal direction. With respect to the intermediate core portion 22, the longitudinal groove 27 is formed to pass through the center of the high basis weight portion 24.
The lateral grooves 28 extend along the width direction of the absorbent core 20 and are arranged at intervals along the longitudinal direction (see FIG. 4). The lateral groove portion 28 is formed in each of the front core portion 21, the intermediate core portion 22, and the rear core portion 23 along the entire length in the width direction.
By providing the vertical groove 27 and the horizontal groove 28 which are easily deformed with a low basis weight, the softness of the absorbent core 20 can be enhanced, and the mounting property can be improved. Further, the liquid absorption speed of the absorbent core 20 can be increased by drawing the liquid into the longitudinal groove 27 and the lateral groove 28.

The lateral groove portion 28 provided in the intermediate core portion 22 can have a function of suppressing the propagation of an external force, as the peripheral groove portion 26 does. That is, the low basis weight portion 25 is divided into a plurality of blocks by the lateral groove portion 28 and the peripheral groove portion 26, and a certain effect of confining the deformation area in block units can be obtained. Thereby, the deformation preventing effect of the high basis weight portion 24 can be further enhanced.
The longitudinal grooves 27 and the lateral grooves 28 are formed to have the same width and depth, respectively, but the invention is of course not limited thereto. For example, the heights of the bottoms of the vertical grooves 27 and the horizontal grooves 28 with the back surface 20B of the absorbent core 20 as a reference plane are set, for example, the same as the height of the bottoms of the peripheral grooves 26 from the reference plane (see FIG. 3).

The widths of the peripheral groove portion 26, the longitudinal groove portion 27 and the horizontal groove portion 28 are preferably 0.5 mm or more and 10 mm or less, and more preferably 1 mm or more and 5 mm or less. The depth of the peripheral groove 26 is, for example, 0.5 mm or more and 10 mm or less, and the depth of the longitudinal groove 27 and the lateral groove 28 is, for example, 0.5 mm or more and 10 mm or less.

In the intermediate core portion 22, the longitudinal groove 27 may be wider than the peripheral groove 26. In such a case, the absorbent core is easily deformed along the excretory part during wearing, and the excreted body fluid is easily diffused along the longitudinal direction. The longitudinal groove 27 is preferably 0.5 mm or more and 5 mm or less larger than the peripheral groove 26 and more preferably 1 mm or more and 3 mm or less.

(Body adhesive part)
In order to prevent deformation of the high basis weight portion 24 more effectively, the main body adhesive portion 151 provided on the main body M of the napkin 1 has a width equal to or less than the width of the intermediate core portion 22 as shown in FIG. It is preferable that the back sheet 13 be formed at a position facing the absorbent core 20 in the thickness direction.
As described above, by preventing the main body adhesive portion 151 from being applied directly under the necking covering portion 34, the necking portion 34 can be optionally selected during external force operation regardless of the type of underwear (the rigidity of the fabric of the underwear). It can be deformed into a shape, whereby the desired three-stage rigidity difference effect can be reliably exerted in the width direction of the intermediate core portion 22.

The coating form of the main-body adhesive portion 151 is not particularly limited, and may be constituted by a single coating film, or may be constituted by a plurality of coating films parallel to the longitudinal direction. The adhesive layer which comprises the adhesion part 15 can be formed with a hot-melt adhesive etc., for example. Examples of hot melt pressure-sensitive adhesives that can be used to form the pressure-sensitive adhesive layer include rubbers, olefins, ethylene vinyl acetate (EVA), and the like. In each pressure-sensitive adhesive layer, the hot melt pressure-sensitive adhesive may be applied continuously or intermittently.
The main body adhesive portion 151 is covered with a peeling sheet (not shown) in the unused state of the napkin 1. The release sheet is releasably attached to each adhesive portion and peeled off when the napkin 1 is used.

As mentioned above, although each embodiment of the present invention was described, the present invention is not limited only to the above-mentioned embodiment, and it is needless to say that various change can be added in the range which does not deviate from the gist of the present invention.

For example, in the above embodiment, although the example of the sanitary napkin was shown as an absorbent article, it is not limited to this. The absorbent article of the present invention may be, for example, an incontinence pad, a cage sheet or the like.

Furthermore, the high basis weight portion is not limited to the configuration in which the width gradually decreases at the end, and the whole may be configured to have substantially the same width.
Alternatively, the front side area and the back side area of the constriction covering may be bonded to each other or separated.
Alternatively, the absorbent core may not have at least one of the peripheral groove, the longitudinal groove, and the lateral groove.

Regarding the above-mentioned embodiment, the present invention further discloses the following absorbent article.

<1> A width greater than the front core portion and the rear core portion which is formed between the pair of constricted regions in the longitudinal core portion and the front core portion and the rear core portion located on both end portions in the longitudinal direction It has a narrow middle core part, and the middle core part has a high basis weight formed at the center in the width direction and a basis weight lower than that of the high basis weight, and is formed around the high basis weight part A core wrap sheet having an absorbent core comprising a low basis weight portion, a core covering portion covering the absorbent core, and a pair of neck covering portions covering the pair of neck regions Absorbent articles.
<2> The absorbent article according to <1>, wherein the low basis weight portion has a side end portion located outward in the width direction of the high basis weight portion, and a density higher than the side end portion. An absorbent article, comprising: a high density part located between the side end part and the high basis weight part.
The absorbent article as described in <3> said <2>, Comprising: The surface sheet arrange | positioned on the said core wrap sheet, The pressing groove formed in the said surface sheet, the said core wrap sheet, and the said absorptive core, The absorbent article, further comprising: the high density part is provided at a formation position of the compressed groove.
<4> The absorbent article according to any one of <1> to <3>, wherein the outer edge line of each of the pair of neck covering portions is the front core portion and the front core portion in each of the pair of neck regions. Outer side of the width direction than a bisector of a line segment parallel to the width direction connecting an imaginary line connecting outer edge portions of the rear core portion and an outer edge line corresponding to the outer edge portion of the intermediate core portion Absorbent articles located on each side.
<5> The absorbent article according to any one of <1> to <4>, wherein the pair of narrow covering portions face each other without being bonded to each other in the thickness direction of the absorbent core. An absorbent article comprising a front side area and a back side area.
&Lt; 6 > The absorbent article according to < 5 >, wherein the front side area and the back side area are formed continuously with each other in the widthwise peripheral edge portion of the pair of narrowed coverings. Sex goods.
<7> The absorbent article according to any one of <1> to <6>, wherein the front core portion and the rear core portion have a basis weight lower than that of the low basis weight portion. Sex goods.
<8> The absorbent article according to any one of <1> to <7>, wherein the high basis weight portion is formed at least over the entire length of the intermediate core portion.
<9> The absorbent article according to <8>, wherein the longitudinal end of the high basis weight portion has a shape in which the width gradually decreases toward the tip.
<10> The absorbent article according to any one of <1> to <9>, wherein the intermediate core portion has a basis weight lower than that of the low basis weight portion and of the high basis weight portion. An absorbent article, further comprising a peripheral groove formed in the periphery.
<11> The absorbent article according to any one of <1> to <10>, further comprising a back surface sheet and a main-body adhesive portion formed on the outer surface of the back surface sheet, An absorbent article having a width equal to or less than the width of the intermediate core portion and formed at a position facing the absorbent core across the backsheet in the thickness direction.
<12> The absorbent article according to any one of <1> to <11>, including a pair of wing portions extending outward in the width direction from the intermediate core portion. Goods.
<13> The absorbent article according to <12>, wherein the wing portion and the intermediate core portion overlap in the longitudinal direction.
<14> The absorbent article according to any one of <1> to <13>, wherein the core wrap sheet is non-stretchable or hardly stretchable.
<15> The absorbent article according to <14>, wherein the core wrap sheet has an elongation of 25% or less when loaded with 1 N per 50 mm width.
<16> The absorbent article according to any one of <1> to <15>, wherein the high basis weight portion extends to at least one of the front core portion and the rear core portion. Sex goods.
<17> The absorbent article according to any one of <1> to <16>, wherein the high basis weight portion has a longitudinal shape in the front-rear direction, and the maximum width thereof is 15 mm or more , 60 mm or less, preferably 20 mm or more and 50 mm or less.
<18> The absorbent article according to any one of <1> to <17>, wherein the basis weight of the high basis weight part is 400 g / m ² or more and 1000 g / m ² or less, and preferably An absorbent article having a weight of 500 g / m ^{2 to} 900 g / m ² .
<19> The absorbent article according to any one of <1> to <18>, wherein the basis weight of the low basis weight part is 100 g / m ² or more and 700 g / m ² or less, and preferably An absorbent article having a weight of 200 g / m ^{2 to} 600 g / m ² .
<20> The absorbent article according to any one of <1> to <19>, wherein the width of the front core portion and the rear core portion is 60 mm or more and 100 mm or less, preferably 70 mm or more The absorbent article which is 90 mm or less.
<21> The absorbent article according to any one of <1> to <20>, wherein the thickness of the front core portion and the rear core portion is 2 mm or more and 10 mm or less.
<22> The absorbent article according to any one of <1> to <21>, wherein a basis weight of the front core portion and the rear core portion is 90 g / m ² or more and 500 g / m ² or less Is an absorbent article.
<23> The absorbent article according to any one of <1> to <22>, wherein the width of the intermediate core portion is 40 mm or more and 75 mm or less, preferably 50 mm or more and 70 mm or less. Absorbent article.
<24> The absorbent article according to any one of <1> to <23>, wherein the length in the longitudinal direction of the intermediate core portion is 60 mm or more and 180 mm or less, preferably 80 mm or more and 170 mm or less There is an absorbent article.
<25> The absorbent article according to any one of <1> to <24>, which is a sanitary napkin.

According to the absorbent article of the present invention, it is possible to suppress deformation of the central region of the absorbent core. Thereby, the occurrence of liquid leakage due to the deformation of the absorbent core can be prevented.

Claims

A front core portion and a rear core portion located on both end sides in the longitudinal direction, and an intermediate portion narrower in width than the front core portion and the rear core portion formed between the pair of constricted regions in the longitudinal middle portion. And a core portion, wherein the intermediate core portion has a high basis weight portion formed at the center in the width direction and a basis weight lower than the high basis weight portion and formed around the high basis weight portion. An absorbent core comprising a basis weight part,
An absorbent article comprising: a core wrap sheet having a core covering portion covering the absorbent core; and a pair of neck covering portions covering the pair of necked regions.
An absorbent article according to claim 1, wherein
The low basis weight part is
A side end portion of the high basis weight portion located outward in the width direction;
An absorbent article comprising: a high density portion having a higher density than the side end portion and located between the side end portion and the high basis weight portion.
The absorbent article according to claim 2, wherein
A front sheet disposed on the core wrap sheet;
The surface sheet, the core wrap sheet, and a squeezing groove formed in the absorbent core.
The said high-density part is provided in the formation position of the said pressing groove. Absorbent article.
An absorbent article according to any one of claims 1 to 3,
The outer edge line of each of the pair of narrow cover portions is a virtual line connecting outer edges of the front core portion and the rear core portion in each of the pair of narrow regions, and an outer edge line corresponding to the outer edge portion of the intermediate core portion An absorbent article, which is positioned outward of the width direction with respect to a bisector of a line segment parallel to the width direction connecting the two.
The absorbent article according to any one of claims 1 to 4, wherein
The pair of neck coverings are
An absorbent article comprising a front side region and a back side region facing each other without being bonded to each other in the thickness direction of the absorbent core.
The absorbent article according to claim 5, wherein
An absorbent article, wherein the front side area and the back side area are formed continuously to each other at the widthwise peripheral edge of the pair of narrowed coverings.
The absorbent article according to any one of claims 1 to 6, wherein
An absorbent article, wherein the front core portion and the rear core portion have a basis weight lower than that of the low basis weight portion.
The absorbent article according to any one of claims 1 to 7, wherein
The high basis weight portion is formed at least along the entire length of the intermediate core portion.
The absorbent article according to claim 8, wherein
The absorbent article, wherein the longitudinal end of the high basis weight portion has a shape whose width gradually decreases toward the tip.
The absorbent article according to any one of claims 1 to 9,
The intermediate core portion has a basis weight lower than that of the low basis weight portion, and further has a peripheral groove portion formed around the high basis weight portion.
The absorbent article according to any one of claims 1 to 10, wherein
With the back sheet
And a main body adhesive portion formed on the outer surface of the back sheet.
The said main-body adhesive part has a width | variety below the width | variety of the said intermediate | middle core part, and is formed in the position which opposes the said absorptive core in the thickness direction on both sides of the said back surface sheet.
The absorbent article according to any one of claims 1 to 11,
An absorbent article comprising a pair of wing portions extending outward in the width direction from the intermediate core portion.
An absorbent article according to claim 12.
An absorbent article, wherein the wing portion and the intermediate core portion overlap in the longitudinal direction.
The absorbent article according to any one of claims 1 to 13,
An absorbent article, wherein the core wrap sheet is non-stretchable or hardly stretchable.
An absorbent article according to claim 14.
The cored wrap sheet has an elongation of 25% or less when loaded with 1 N per 50 mm width.
An absorbent article according to any one of the preceding claims, wherein
An absorbent article, wherein the high basis weight portion extends to at least one of the front core portion and the rear core portion.
The absorbent article according to any one of claims 1 to 16, wherein
The high basis weight portion has a longitudinal shape in the front-rear direction, and the maximum width thereof is 15 mm or more and 60 mm or less, preferably 20 mm or more and 50 mm or less.
The absorbent article according to any one of claims 1 to 17, wherein
The basis weight of the high basis weight part is 400 g / m 2 or more and 1000 g / m 2 or less, and preferably 500 g / m 2 or more and 900 g / m 2 or less.
The absorbent article according to any one of claims 1 to 18,
The basis weight of the low basis weight part is 100 g / m 2 or more and 700 g / m 2 or less, preferably 200 g / m 2 or more and 600 g / m 2 or less.
An absorbent article according to any one of the preceding claims, wherein
The width of the front core portion and the rear core portion is 60 mm or more and 100 mm or less, and preferably 70 mm or more and 90 mm or less.
The absorbent article according to any one of claims 1 to 20, wherein
The thickness of the said front core part and the said back core part is 2 mm or more and 10 mm or less. Absorbent article.
An absorbent article according to any one of the preceding claims, wherein
The basis weight of the front core portion and the rear core portion is 90 g / m 2 or more and 500 g / m 2 or less. Absorbent article.
The absorbent article according to any one of claims 1 to 22,
The width of the intermediate core portion is 40 mm or more and 75 mm or less, preferably 50 mm or more and 70 mm or less.
The absorbent article according to any one of claims 1 to 23,
The length in the longitudinal direction of the intermediate core portion is 60 mm or more and 180 mm or less, preferably 80 mm or more and 170 mm or less.
The absorbent article according to any one of claims 1 to 24, which is a sanitary napkin.