JP6692866B2 - Absorbent article - Google Patents

Description

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

  An absorbent article of a type that is used by being placed inside underwear, such as a sanitary napkin, has an absorbent core for absorbing a liquid substance such as menstrual blood. For example, the absorbent core described in Patent Document 1 is provided with a protruding portion having a long shape in the longitudinal direction of the absorbent core from the excretion portion facing portion to a part of the rear portion, and also on the wearer's skin. A groove is provided along the groove.

JP, 2015-112235, A

  An absorbent article such as a sanitary napkin is mounted such that its rear portion corresponds to the buttocks of the wearer. For example, when the wearer is lying in a supine position, such as at bedtime, the shape of the buttocks is crushed and deformed by the bedding compared with when standing up, and the absorbent article and the excretory part of the absorbent article are exposed to the skin and the back. A gap is likely to be formed between the product and liquid, and liquid leakage may occur.

  An object of the present invention relates to an absorbent article that can suppress liquid leakage.

An absorbent article according to an aspect of the present invention includes a front core portion and a rear core portion located on both end sides in the front-rear direction, and an intermediate core portion located between the front core portion and the rear core portion. It has an absorbent core.
The intermediate core portion is located in the central region in the width direction, a high basis weight portion having a higher basis weight than the front core portion and the rear core portion, and located in both side regions in the width direction, from the high basis weight portion. A low grammage portion having a low grammage.
The high basis weight portion, the high basis weight and high thickness portion, the high basis weight, high positioned on both sides in the width direction of the thickness portion the high basis weight, high basis is thinner thickness than the high thickness portion located at the widthwise central portion And a low-thickness portion.
The rear core portion has a wide vertical groove portion that extends along the front-rear direction and that is located behind the high basis weight and high thickness portion, and a vertical groove portion that is narrower than the wide vertical groove portion.

  As described above, according to the absorbent article of the present invention, liquid leakage can be suppressed.

It is a top view of an absorptive article concerning one embodiment of the present invention. It is a schematic cross section in the intermediate core part cut | disconnected by the II-II line | wire of the absorbent article of FIG. 1, and illustration of the pressing groove is abbreviate | omitted in this figure. It is a schematic cross section in the back core part cut | disconnected by the III-III line of the absorbent article of FIG. It is a top view which shows the absorptive core which comprises a part of absorbent article of FIG. It is a top view of the absorptive core which concerns on other embodiment. It is a top view of the absorptive core which concerns on other embodiment. It is sectional drawing of the absorber for demonstrating the other example of arrangement | positioning of the absorber in an absorbent article.

[Overall structure of napkin]
Hereinafter, in each drawing, the X-axis direction corresponds to the front-back direction of the absorbent article 1, the Y-axis direction corresponds to the width direction, and the Z-axis direction corresponds to the up-down direction (thickness direction).
The absorbent article 1 of the present embodiment is configured as a sanitary napkin, and will be referred to as a napkin 1 hereinafter. The napkin 1 of the present embodiment may be used at bedtime, and may have a length of 30 cm or more along the front-rear direction X, for example.

As shown in FIG. 1, the napkin 1 includes a main body M, a pair of wing portions W, and a pair of rear flap portions F in the present embodiment.
The main body M extends in the front-rear direction X and is fixed to the inner surface (mounted surface) of the wearer's underwear during wearing. The main body M has an absorber 11 and has a function of absorbing a liquid substance (hereinafter, also referred to as “liquid”) such as menstrual blood of the wearer.
The main body M has a front region M1, a middle region M2, and a rear region M3 that are sectioned along the front-rear direction X.
The front region M1 is a region arranged in front of the middle region M2 (on the abdomen side of the wearer), and is configured to face the front of the excretion part of the wearer at the time of wearing.
The intermediate region M2 is configured to face the excretion part of the wearer when the wearer wears it. The intermediate region M2 may be located closer to the front of the main body M as shown in the figure, or may be located at the center of the main body M.
The rear region M3 is a region arranged behind the middle region M2 (on the back side of the wearer), and is configured to face the rear of the excretion part of the wearer when worn.

The wing portion W is configured to largely protrude outward in the width direction from the intermediate region M2.
The rear flap portion F is configured to bulge outward from the rear region M3 in the width direction.
The napkin 1 may not have at least one of the wing W and the rear flap F.

[Structure of each part of napkin]
As shown in FIGS. 1 to 3, the napkin 1 includes an absorber 11, a top sheet 12, a back sheet 13, a pair of side sheets 14, and a pressing groove portion 16. In the main body M, the napkin 1 has a structure in which a back sheet 13, an absorber 11, and a top sheet 12 are laminated. The napkin 1 is configured such that the topsheet 12 contacts the wearer's skin when worn.

The absorber 11 has a front-back direction in the X-axis direction, and is arranged at the center of the napkin 1 in the thickness direction. The absorber 11 absorbs the liquid from the surface on the surface sheet 12 side and diffuses the liquid inside to hold the liquid. The absorber 11 will be described later.
The topsheet 12 is configured as a liquid-permeable sheet material, and is arranged on the absorber 11. The topsheet 12 constitutes an outer surface of the main body M above the napkin 1 in the thickness direction.
The backsheet 13 is arranged to face the topsheet 12 in the thickness direction with the absorber 11 interposed therebetween. The back sheet 13 constitutes an outer surface of the napkin 1 below in the thickness direction. The back sheet 13 is joined to the top sheet 12 and the side sheets 14 at the peripheral portion by an adhesive, heat sealing, or the like.
The pair of side sheets 14 face each other in the width direction with the top sheet 12 sandwiched therebetween, and are arranged on the peripheral edge of the napkin 1 in the width direction.
The pair of compressed groove portions 16 are configured as linear grooves formed by compressing the absorber 11 and the surface sheet 12.

(Basic structure of absorber)
As shown in FIGS. 2 and 3, the absorbent body 11 has an absorbent core 20 and a core wrap sheet 30.
The absorbent core 20 has a function of absorbing and retaining liquid. The absorbent core 20 may be formed of, for example, a fiber assembly formed of hydrophilic fibers such as pulp fibers, or may have a configuration in which the water absorption polymer is held in the fiber assembly. .. Hereinafter, the member forming the absorbent core 20 is referred to as an absorbent member.
As shown in FIGS. 2 and 3, 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 of the core wrap sheet 30 along the X-axis direction is formed to be equal to the length (total length) of the absorbent core 20 in the front-rear direction X, but the length is not limited to this, and is longer than the total length of the absorbent core 20. It may be long or short.
The core wrap sheet 30 covers the absorbent core 20 and has, for example, a function of retaining the shape of the absorbent core 20. The core wrap sheet is formed of, for example, thin and soft paper such as tissue paper or a liquid-permeable nonwoven fabric.
The core wrap sheet 30 may be composed of one sheet material or may be composed of a plurality of sheet materials. The core wrap sheet 30 may be joined to the topsheet 12 and the backsheet 13 with, for example, an adhesive applied in a predetermined pattern.

(Structure of absorbent core)
As shown in FIG. 4, the absorbent core 20 has a front core part 21 located in the front region M1, an intermediate core part 22 located in the intermediate region M2, and a rear core part 23 located in the rear region M3. .. The front core portion 21 and the rear core portion 23 are located on both ends of the absorbent core 20 in the front-rear direction X, 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 region M1 to the front side of the rear region M3 via the intermediate region M2. The absorbent core 20 has a planar shape that is bilaterally symmetrical in the width direction.

FIG. 4 shows widths D1, D2, D3 that are the widthwise dimensions of the front core portion 21, the intermediate core portion 22, and the rear core portion 23. 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 a constriction in the front-rear direction X intermediate portion.
The front core portion 21 has a taper portion 21a at the rear end, and the rear core portion 23 has a taper portion 23a at the front end. The taper portions 21 a and 23 a increase the width of the intermediate core portion 22 toward the front core portion 21 and the rear core portion 23.
In the present embodiment, the absorbent core 20 having a constricted shape is described as an example, but an absorbent core having a uniform width in the front-rear direction X may be used.

  The intermediate core portion 22 is an excretion portion facing portion that is disposed so as to face the vaginal opening that is the excretion portion of the wearer when the napkin 1 is attached. The front core portion 21 is arranged closer to the wearer's front side (abdominal side) than the intermediate core portion 22, and the rear core portion 23 is arranged closer to the wearer's rear side (back side) than the intermediate core portion 22.

A plurality of groove portions are provided on the skin facing surface 20a side of the absorbent core 20.
Specifically, the front core portion 21, the intermediate core portion 22, and the rear core portion 23 are provided with vertical groove portions 27 and horizontal groove portions 28, and in addition, the intermediate core portion 22 is provided with a peripheral groove portion 29.
Further, a boundary groove portion 60 is provided at a boundary portion P1 between the front core portion 21 and the intermediate core portion 22, and a boundary groove portion 61 is provided at a boundary portion P2 between the intermediate core portion 22 and the rear core portion 23. Has been. The boundary portion P1 and the boundary portion P2 are located so as to cross the absorbent core 20 in the width direction.
The boundary portion P1 refers to a portion that does not belong to between the front core portion 21 and the intermediate core portion 22, and the boundary portion P2 does not belong to between the rear core portion 23 and the intermediate core portion 22. Refers to the part. However, since the boundary groove portion is not essential in the present invention, the absorbent core having no boundary groove portion does not have a boundary portion as “a portion which does not belong to any one”.

  The absorbent core 20 is divided into a plurality of blocks by the vertical groove portion 27, the horizontal groove portion 28, the peripheral groove portion 29, and the boundary groove portions 60 and 61 having a low basis weight, in which the basis weight of the absorbent member is relatively low. These groove portions are configured to sink downward from the upper surface (the surface located on the skin side of the wearer) in the thickness direction with respect to the block portion divided into blocks. On the other hand, the block portion is configured to project upward in the thickness direction.

In the absorbent core 20, the region where the groove is formed, that is, the bottom where the groove is formed is relatively thinner than the region of the block where the groove is not formed. The bottom portion forming the groove portion has a relatively lower basis weight as compared with the block portion, and the bottom portion of the groove portion has lower rigidity as compared with the block portion. Therefore, when an external force is applied to the absorptive core 20, the absorptive core 20 is easily deformed with the groove portion as the deformation starting point.
In the following description, the basis weights of the front core portion 21, the intermediate core portion 22, and the rear core portion 23 are the basis weights of the block portions excluding the groove portions 27, 28, 29, 60, 61.

The vertical groove portions 27 extend along the front-rear direction X and are arranged in plural along the width direction at intervals. The vertical groove portion 27 is formed over the entire length in the front-rear direction X so as to divide the front core portion 21, the intermediate core portion 22, and the rear core portion 23 in the width direction.
The lateral groove portions 28 extend along the width direction Y and are arranged at intervals along the front-rear direction X. The lateral groove portion 28 is formed over the entire length in the width direction Y so as to divide the front core portion 21, the intermediate core portion 22, and the rear core portion 23 in the front-rear direction X. In this embodiment, the boundary groove portions 60 and 61 formed in the boundary portions P1 and P2 are not included in the lateral groove portion 28. The groove width, which is the length of the boundary groove portions 60 and 61 in the front-rear direction X, is wider than that of the lateral groove portion 28.
The peripheral groove portion 29 is formed along the outer edge in the front-rear direction X of the high basis weight portion 4 described below.
The configuration such as the shape and arrangement of the vertical groove portion 27, the horizontal groove portion 28, and the peripheral groove portion 29 is not limited to the configuration illustrated in FIG. 4, and may be appropriately set based on the shape of the absorbent core 20, the required function, and the like. Is set.

(Structure of the intermediate core part)
As shown in FIGS. 2 and 4, the intermediate core portion 22 has a high basis weight portion 4 in which the basis weight of the absorbent member is high, and a low basis weight portion 25 having a lower basis weight than the high basis weight portion 4. The basis weight of the high basis weight portion 4 is higher than the basis weights of the front core portion 21 and the rear core portion 23.
The high basis weight portion 4 is located in the widthwise central region 65 of the intermediate core portion 22, and is provided to extend in the front-rear direction X. The low basis weight portions 25 are located in the widthwise side regions 66, 66 of the intermediate core portion 22, respectively. The pair of low basis weight portions 25 extend in the front-rear direction X and are positioned to face each other along the width direction with the high basis weight portion 4 interposed therebetween. The widthwise both side areas 66, 66 are located outward in the widthwise direction with respect to the widthwise central area 65.
The high basis weight portion 4 is arranged so as to face the excretion portion of the wearer when the napkin 1 is attached.

Furthermore, the high grammage part 4 has the high grammage high thickness part 41 and the high grammage low thickness part 42. The high basis weight and high thickness portion 41 is located at the center in the width direction Y. The high grammage low-thickness portions 42 are located on both sides of the high grammage high-thickness portion 41 in the width direction Y so as to face each other along the width direction Y with the high grammage high-thickness portion 41 therebetween.
In FIG. 4, the high basis weight portion 4 is shown by a dot pattern. In the high grammage part 4, the density of the dot pattern of the high grammage low thickness part 42 is shown to be denser than that of the high grammage high thickness part 41.
In the intermediate core portion 22, the high basic weight high thickness portion 41, the high basic weight low thickness portion 42, the peripheral groove portion 29, and the low basic weight portion 25 are symmetrically arranged with the vertical groove portion 27c located in the center in the width direction Y as the axis of symmetry. Will be placed.

As shown in FIG. 2, the high basic weight / thickness portion 41 of the high basic weight portion 4 is formed thicker than the low basic weight portion 25 and the high basic weight / low thickness portion 42, and is formed in the thickness direction upper side (on the surface sheet 12 side). ). This ensures a good fit between the center portion of the intermediate region M2 of the napkin 1 corresponding to the high basis weight and thick portion 41 and the excretion portion of the wearer.
In the napkin 1, the basis weight of the high basis weight and low thickness portion 42 is equal to the basis weight of the high basis weight and high thickness portion 41. However, the basis weights of the high basis weight and high thickness portion 41 and the high basis weight and low thickness portion 42 do not have to be completely the same, and from the viewpoint of absorption performance, the difference between the higher basis weight and the lower basis weight is The value divided by the higher basis weight is preferably within 20%, more preferably within 10%. The high basis weight, low thickness portion 42 has a higher density of the absorbent member than the high basis weight, high thickness portion 41, and has a high density. The high grammage low-thickness portion 42 has a thickness smaller than that of the high grammage high-thickness portion 41 and equal to that of the low grammage portion 25. The high grammage low-thickness portion 42 is located outward in the width direction of the high grammage high-thickness portion 41, and is located between the high grammage high-thickness portion 41 and the low grammage portion 25.
In the block portion provided in the intermediate core portion 22, the high grammage low thickness portion 42 has the highest rigidity, the high grammage high thickness portion 41 has the next highest, and the low grammage portion 25 has the lowest.
The high grammage high-thickness portion 41 and the high grammage low-thickness portion 42 are provided to extend over the entire length in the front-rear direction X of the intermediate core portion 22.

  The method for providing the high-basis-weight part 4 with the high-density, high-basis-weight and low-thickness part 42 is not particularly limited. For example, after forming a high basic weight portion having a uniform thickness, the high basic weight portion is locally pressed and compressed to form a high basic weight high thickness portion 41 and a high basic weight low thickness portion 42. The basis weight part 4 can be formed. In this case, the compressed area becomes the high basis weight / thickness portion 42, and the area not subjected to the compression process becomes the high basis weight / thickness portion 41.

  As shown in FIG. 4, the low basis weight portion 25 constitutes a block portion group including five block portions arranged in the front-rear direction X, and the block portion groups are arranged on both sides in the width direction of the high basis weight portion 4, respectively. It The low basis weight portion 25 is configured to sink downward from the upper surface of the high basis weight / thickness portion 41. The low basis weight portion 25 has the same thickness as the high basis weight and low thickness portion 42.

  The intermediate core portion 22 is provided with a peripheral groove portion 29, one vertical groove portion 27c, and four horizontal groove portions 28. Here, the vertical groove portion located in the intermediate core portion 22 will be referred to as a vertical groove portion 27c in order to be distinguished from the vertical groove portion 27 provided in another core portion. 27.

As shown in FIG. 4, the peripheral groove portion 29 is formed between the high basic weight portion 4 and the low basic weight portion 25 so as to surround at least the periphery of the high basic weight portion 4 in the front-rear direction X. The peripheral groove portion 29 is provided along the side edge of the high basis weight / low thickness portion 42. The peripheral groove portion 29 has a lower basis weight than the low basis weight portion 25.
The peripheral groove portion 29 is provided in the front-rear direction X, and has a straight portion 291 extending along the front-rear direction X and a curved portion 292 that communicates with the straight portion 291 and is curved. The curved portion 292 makes the front end portion 45 and the rear end portion 46 of the high basis weight portion 4 substantially semicircular. The shape is not limited to the semi-circular shape, and a triangular shape, a trapezoidal shape, a combined shape of an arc and a straight line, or the like is preferable so that the external force acting in the plane can be dispersed.
The peripheral groove portion 29 is provided in a boundary portion P2 (P1) between the intermediate core portion 22 and the rear core portion 23 (the front core portion 21 and the intermediate core portion 22), and extends along the width direction to form a boundary groove portion 61 (60). Communicate with.
The rear end portion 46 of the high basic weight portion 4 extending in the front-rear direction X and the boundary groove portion 61 are adjacent to each other, and the front end portion 45 of the high basic weight portion 4 and the boundary groove portion 60 are adjacent to each other.

The vertical groove portion 27c is located at the center in the width direction Y of the intermediate core portion 22 and at the center in the width direction Y of the high basis weight, high thickness portion 41, and in the width direction Y center of each of the front core portion 21 and the rear core portion 23. It is located on the same straight line as the vertical groove portion 27 and is in communication with each other.
The four lateral groove portions 28 provided in the intermediate core portion 22 are arranged parallel to each other at equal intervals so as to cross the intermediate core portion 22 along the width direction Y. The lateral groove portion 28 is arranged so as to be orthogonal to the linear portion 291 of the peripheral groove portion 29.

(Structure of rear core part)
Next, the rear core portion 23 will be described. The absorbent core 20 has a vertical groove portion 27 and a horizontal groove portion 28 having two kinds of width dimensions. In the rear core portion 23, the relatively wide vertical groove portion 27 is referred to as a wide vertical groove portion 27a, and the narrow narrow vertical groove portion is referred to as a narrow vertical groove portion 27b. When it is not necessary to distinguish between the wide vertical groove portion 27a and the narrow vertical groove portion 27b, both are referred to as the vertical groove portion 27.

Five lateral groove portions 28 are arranged on the rear core portion 23 at an equal pitch.
Five longitudinal groove portions 27 are arranged on the rear core portion 23 at an equal arrangement pitch. The five vertical groove portions 27 of the rear core portion 23 are formed over the entire length in the front-rear direction X. Of the five vertical groove portions 27, the three vertical groove portions 27 located in the central portion in the width direction Y are wide wide vertical groove portions 27a, and the vertical groove portions 27 located on the left and right sides in the width direction Y are narrow narrow vertical groove portions. By setting the width to 27b, the rigidity distribution in the width direction of the rear core portion 23 is adjusted. Here, the array pitch refers to a center-to-center distance between adjacent vertical groove portions.

Of the three wide vertical groove portions 27a, one wide vertical groove portion 27a located at the center in the width direction Y (hereinafter referred to as the central wide vertical groove portion 27a) is located at the center in the width direction Y of the intermediate core portion 22 and has a high height. It is located behind the grammage high-thickness portion 41.
Here, as shown in FIG. 4, the rear side of the high basis weight / thickness portion 41 is a pair that extends along the front-rear direction through both side edges that define the widest width of the high basis weight / thickness portion 41. When the virtual line segments L1 and L1 are drawn, the rear core portion 23 indicates the region R1 sandwiched between the pair of virtual line segments L1 and L1.
Positioning behind the high basis weight / thickness portion 41 means that at least a part of the wide vertical groove portion 27a at the center is located in the region R1. That is, not only the wide vertical groove portion 27a in the center is located within the region R1 but also a part of the wide vertical groove portion 27a in the center is located in the region R1 and the other portion is in the width direction Y of the region R1. The form located outside is also included.

Of the three wide vertical groove portions 27a, the wide vertical groove portions 27a (hereinafter, referred to as left and right wide vertical groove portions 27a) located on the left and right sides in the width direction Y are respectively positioned behind the high basis weight and low thickness portion 42.
Here, as shown in FIG. 4, the rear side of the high basis weight / low thickness portion 42 extends along the front-rear direction through both side edges of the high basis weight / low thickness portion 42 located on the outermost side in the width direction Y. When the pair of existing virtual line segments L2 and L2 is drawn, it indicates the region R2 that is the rear core portion 23 and is sandwiched between the virtual line segments L1 and L2.
Positioning behind the high basis weight, low thickness portion 42 means that at least part of each of the left and right wide vertical groove portions 27a is located within the region R2. That is, of course, the left and right wide vertical groove portions 27a are located in the region R2, and the left and right wide vertical groove portions 27a are partially located in the region R2 and the other portions are located in the region R2. It also includes a form located outside in the width direction of the.

  In the absorbent core 20, the inner side of the imaginary line segment L2 in the width direction Y is the central region 65, and the outer side thereof is the side region 66. It is preferable that the “portion having the largest width in the width direction of the high grammage portion 4” exists in the central portion of the intermediate core portion 22 in the longitudinal direction in consideration of fitability to the groin portion of the wearer.

  As shown in FIG. 3, the thickness t1 of the bottom portion forming the groove of the wide vertical groove portion 27a at the center of the absorbent core 20 is smaller than the thickness t2 of the bottom portion forming the groove of the left and right wide vertical groove portions 27a. .. In the present embodiment, since the block portions provided in the rear core portion 23 have the same height, the groove depth of the central wide vertical groove portion 27a is deeper than the groove depth of the left and right wide vertical groove portions 27a. be able to.

  Similarly to the rear core portion 23, the front core portion 21 is also provided with three wide vertical groove portions 27 in the center portion in the width direction, and one narrow vertical groove portion is provided on each side with these three wide vertical groove portions 27 interposed therebetween. A groove 27 is provided. In the front core portion 21, the central wide vertical groove portion 27 of the three wide vertical groove portions 27 is located in front of the high basis weight, high thickness portion 41.

[Operation and effect in the present embodiment]
The absorbent core 20 in the present embodiment has the high basis weight portion 4 at the center in the width direction Y and the low basis weight portions 25 on both sides of the intermediate core portion 22. The low basis weight portion 25 has a lower basis weight and a lower rigidity than the high basis weight portion 4. When the intermediate core portion 22 of the absorbent core 20 receives an external force directed toward the inner side in the width direction Y from both legs of the wearer located on the outer side in the width direction at the time of wearing, the low basis weight portion 25 deforms first, and the absorbent core 20 is absorbed. The external force acting on is absorbed or relieved. Therefore, the external force propagating to the high basis weight section 4 is reduced, the deformation of the high basis weight section 4 due to the external force is suppressed, and the liquid leakage due to the deformation of the high basis weight section 4 is suppressed.
Further, since the high grammage portion 4 has a higher grammage of the absorbent member than the low grammage portion 25, the high grammage portion 4 has a sufficient absorption capacity, so that the liquid reaches the side edge of the absorbent core 20. This is suppressed, and side leakage is suppressed.

Further, the high basis weight portion 4 has a high basis weight / low thickness portion 42 whose thickness is reduced by compressing both side portions in the width direction Y. By reducing the thickness in this way, the feeling of stiffness during wearing is reduced, and a comfortable feeling of use can be given to the wearer.
The high basis weight and high thickness portion 41 is formed over the entire length of the intermediate core portion 22 so as to project in the skin direction. Thereby, when the napkin 1 is attached, it is possible to secure a good fit between the high basis weight, high thickness portion 41 and the excretion portion.

Further, although the high-basis weight / low-thickness portion 42 is thinner than the high-basis weight / high-thickness portion 41, the absorbent member is densely configured and is excellent in the force of extracting the liquid. The absorptive core 20 has an action of withdrawing liquid from the skin surface side, and the force of withdrawing this liquid is generated by the capillary force of the absorbent core 20, and the capillary force is the density of the absorbent member constituting the absorptive core. Becomes stronger in proportion to. That is, by providing the high-density, high-basis-weight, low-thickness portion 42, a capillary force is exerted to easily draw out the liquid from the skin surface side, and the extracted liquid is suppressed from reaching the side edge of the absorbent core. It
Further, since the compressed high-density, high-basis-weight, low-thickness portion 42 is provided to extend in the front-rear direction X over the entire length of the intermediate core portion 22 serving as the excretion part facing portion, the high-basis weight low-weight portion 42 The diffusion direction is guided so that the liquid absorbed in the thick portion 42 diffuses in the front-rear direction X, and lateral leakage is suppressed.

In the present embodiment, at least one wide vertical groove portion 27a is provided behind the high basis weight / thickness portion 41 extending in the front-rear direction X.
The high basis weight / thickness portion 41 has a higher basis weight and higher rigidity than the rear core portion 23, and is less likely to be deformed. The difficulty of deformation of the high basis weight and high thickness portion 41 propagates to the rear of the high basis weight and high thickness portion 41 and affects the flexibility of the rear core portion 23. This can be suppressed by providing the wide central vertical groove portion 27a.
The number of wide vertical groove portions 27a located behind the high basis weight / thickness portion 41 is not limited to one and may be plural. Further, in the present embodiment, an example is given in which the center in the width direction Y of the high basis weight, high thickness portion 41 and the center in the width direction Y of the wide vertical groove portion 27a are located on the same straight line along the front-rear direction X. The shape is not limited to the shape, and the center in the width direction Y of the high-basis-weight high-thickness portion 41 and the center of the wide vertical groove portion 27a in the width-direction Y may be deviated, and the wide vertical groove portion 27a may be provided behind the high-basis weight high-thickness portion 41. Should be located.

Moreover, in the present embodiment, in the rear core portion 23, the wide vertical groove portions 27a are located in the central region in the width direction Y, and the narrow vertical groove portions 27b are located in both lateral regions in the width direction Y. As a result, the rigidity in the bending direction is lower in the widthwise Y center area where the wide vertical groove portion 27a is located than in the widthwise Y side areas where the narrow vertical groove portion 27b is located.
By thus providing the vertical groove portions having different groove widths and adjusting the rigidity distribution in the width direction of the rear core portion 23, when the napkin 1 is worn by the wearer, the wide vertical groove portion 27a is formed in the rear core portion 23. The central area 65 in the width direction in which is located is configured to project toward the wearer's skin side preferentially to the side areas 66, 66 in which the narrow vertical groove portion 27b is located, with the wide vertical groove portion 27a as the deformation starting point. Easy to deform. Since the widthwise central region 65 of the rear core portion 23 is deformed so as to project to the skin side along the gluteal cleft of the buttocks, the gap between the gluteal cleft of the wearer and the absorbent article is reduced. Further, the widthwise both side areas 66 follow the central area 65 which is preferentially deformed by the narrow vertical groove portion 27b being positioned, and are easily deformed along the bulge of the buttocks.
As a result, the gap between the buttocks and the napkin 1 is reduced, the fit is improved, and leakage at the rear portion, particularly lateral leakage is suppressed. Further, even when the wearer lies on his back and the buttocks are deformed by the bedding, the rear core portion 23 is likely to be deformed along the shape of the body, so that liquid matter such as menstrual blood excreted from the excretion part of the wearer is rearward. Even if it flows out to the portion, it is quickly absorbed by the absorbent core 20, and liquid leakage in the rear portion is suppressed.

As described above, the absorbent article of the present embodiment is provided with the high basis weight portion having the high basis weight and low thickness portion and the high basis weight and high thickness portion, thereby reducing the feeling of stiffness and providing a comfortable feeling of use. While giving it to the wearer, it has a sufficient liquid absorption capacity, has a high fit to the excretion part, is resistant to side leakage in the intermediate core part, and has excellent absorption performance.
Further, in the absorbent article of the present embodiment, the wide vertical groove portion is provided behind the high basis weight high thickness portion, so that the high basis weight high thickness portion is hard to deform and affects the flexibility of the rear core portion. Is suppressed. In addition to this, by providing a plurality of vertical grooves with different width dimensions in the rear core part, the rear core part is flexible and easily deforms according to the shape of the body, and the fitability in the rear core part is improved. Is improved, and leakage at the rear portion, especially lateral leakage is suppressed.
Further, in the absorbent core 20 according to the present embodiment, a region having a relatively high basis weight in the entire absorbent core 20, such as the high basis weight portion 4 provided in the intermediate core portion 22, is provided in the rear core portion 23. Therefore, the ruggedness of the rear portion of the napkin 1 is reduced and the wearer is provided with a comfortable feeling of use, while the fitting property is improved as described above, so that the liquid does not easily leak.

  Further, as in the present embodiment, a plurality of wide vertical groove portions 27a are arranged in the rear core portion 23 and behind the high basis weight portion 4 of the intermediate core portion 22, so that the widthwise central region 65 is worn. When protruding toward the skin side, the high basis weight portion 4 is lifted up and the adhesion to the excretion portion is enhanced, which is effective in suppressing lateral leakage of body fluid. Further, as in the present embodiment, the boundary groove portion 61 is present between the intermediate core portion 22 and the rear core portion 23, and the peripheral groove portion 29 is present so as to surround the periphery of the high basis weight portion 4, which is more preferable. The entire high grammage portion 4 is easily lifted up. In particular, in a structure in which the width of the high basis weight portion 4 on the rear end side in the front-rear direction X is narrower than the width on the center side in the front-rear direction X, the lift-up is further facilitated.

Further, in the present embodiment, the wide vertical groove portion 27a is provided behind the high basis weight / low thickness portion 42 extending in the front-rear direction of the intermediate core portion 22.
The high grammage low thickness portion 42 has a higher grammage and rigidity than the rear core portion 23, and is less likely to be deformed. The difficulty of deformation of the high grammage low thickness portion 42 propagates to the rear of the high grammage low thickness portion 42 and affects the flexibility of the rear core portion 23. This can be suppressed by providing (the left and right wide vertical groove portions 27a).
Therefore, the rear core portion 23 can be provided with flexibility, the fitting property in the rear core portion is improved, and the leakage in the rear portion is further suppressed.

Further, in the absorbent core 20 of the present embodiment, as shown in FIG. 3, the thickness t1 of the bottom portion forming the groove of the central wide vertical groove portion 27a is the thickness of the bottom portion forming the groove of the left and right wide vertical groove portions 27a. It is thinner than t2.
As a result, the rigidity of the bottom portion forming the central wide vertical groove portion 27a is lower than that of the bottom portion forming the left and right wide vertical groove portions 27a. Therefore, when the napkin 1 is worn, the absorbent core 20 is deformed so as to preferentially protrude toward the wearer's skin side than the left and right wide vertical groove portions 27a with the central wide vertical groove portion 27a as the deformation starting point. It becomes easier and the napkin 1 is more likely to follow the gluteal cleft that is a shape that is suddenly depressed with respect to the bulge of the buttock. As a result, the fitting property is further improved and the leakage at the rear part is suppressed.
In the present embodiment, the rigidity of the bottom portion forming the groove portion is changed by changing the thickness of the bottom portion. However, the thickness of the bottom portion is made equal, and the groove width of the wide vertical groove portion 27a at the center is set to the wide vertical groove portions on the left and right. The rigidity of the bottom portion forming the groove may be changed by making the width wider than 27a.

  Further, since the vertical groove portion 27c having a lower basic weight than the high basic weight portion 4 extending along the front-rear direction X is provided at the center of the high basic weight / thickness portion 41 in the width direction Y, the excretion portion has a high height. The grammage high-thickness portion 41 is easy to follow, the fitting property to the excretion portion is further improved, and liquid leakage is suppressed.

In addition, since the boundary groove portion 61 having a low basis weight is provided at the boundary portion P2 between the intermediate core portion 22 and the rear core portion 23, the napkin 1 is easily bent in the front-rear direction X with the boundary groove portion 61 as a deformation starting point, and the wearer wears it. The napkin 1 is easily deformed along the shape from the excretion part of the body to the back side, the fitting property is improved, and liquid leakage is suppressed.
Further, by providing the boundary groove portion 61, the external force acting on the intermediate core portion 22 is relaxed by the boundary groove portion 61, and the deformation in the intermediate core portion 22 is less likely to propagate to the rear core portion 23. Similarly, the deformation in the rear core portion 23 is unlikely to propagate to the intermediate core portion 22. As described above, the intermediate core portion 22 and the rear core portion 23 are less likely to be affected by the deformation of the other, the deformation of the absorbent core is suppressed, and the liquid leakage is suppressed.

In addition, in the present embodiment, since the lateral groove portion 28 is arranged in addition to the vertical groove portion 27 over the entire length of the napkin 1 in the front-rear direction X, the napkin 1 has the shape of the wearer's wearing target portion in the front-rear direction X. It is easy to deform along with it and the fit is improved.
Further, in the present embodiment, by providing the vertical groove portion 27, the horizontal groove portion 28, the peripheral groove portion 29, and the boundary groove portions 60 and 61 which are easily deformed with a low basis weight, the flexibility of the absorbent core 20 is enhanced and the wearability is improved. It is possible to improve. Further, by providing the groove portion, the liquid excreted in the space of the groove can be quickly drawn and taken into the absorbent core 20, and the liquid absorption speed can be increased. Moreover, since the absorbent core 20 is divided into a plurality of blocks, the surface area of the absorbent core 20 can be increased, and the liquid can be efficiently absorbed and retained.

  Further, in the above-described embodiment, since the absorbent core 20 has the constricted portion and is formed so that the width of the intermediate core portion 22 serving as the facing portion of the excretion portion is narrowed, the absorbent core 20 is mounted at the time of wearing. It is possible to reduce the external force that is received from both legs of the wearer on the outer side in the width direction toward the inner side in the width direction, and the deformation of the intermediate core portion 22 is suppressed. As a result, the napkin 1 easily fits the wearer's body and is prevented from shifting from the skin.

[Additional description of this embodiment]
Hereinafter, the description of the present embodiment will be supplemented.
Numerical examples of each configuration will be described, but these numerical values are examples and are not limited to the numerical values described here.
(Numerical example of each configuration)
Hereinafter, regarding the width of the high basis weight portion 4, the width of the high basis weight and high thickness portion 41, the width of the high basis weight and low thickness portion 42, and the width of the low basis weight portion 25, the width of the high basis weight portion 4 is the front-back direction X. When the width is not uniform with respect to, the width is the width of a portion where the width of the high basis weight portion 4 is the largest and a virtual line is drawn in the width direction.
The width of the high basis weight portion 4 arranged in the central region in the width direction of the intermediate core portion 22 is preferably 15 mm or more, more preferably 20 mm or more, and preferably 60 mm or less, more preferably 50 mm or less. By setting the width within such a range, a sufficient absorption amount can be secured.
The high grammage portion 4 has a high grammage low thickness portion 42 whose thickness is locally reduced by compressing both sides thereof. By reducing the thickness in this way, the feeling of stiffness during mounting is reduced.
As shown in FIG. 2, the width a of the high basis weight, high thickness portion 41 is preferably 10 mm or more, more preferably 15 mm or more, and preferably 40 mm or less, more preferably 30 mm or less. By setting the width of the high basis weight / thickness portion 41, which is the protruding portion of the absorbent core 22, in such a range, it is possible to enhance the fit of the wearer to the excretion portion.
From the viewpoint of diffusing the absorbed liquid in the front-rear direction while suppressing the occurrence of rubbing, the width b of the high basis weight / low thickness portion 42 is preferably narrower than the width a of the high basis weight / high thickness portion 41. Further, from the same viewpoint, the width b of the high basis weight and low thickness portion 42 is preferably 2 mm or more, more preferably 3 mm or more, and preferably 10 mm or less, more preferably 7.5 mm or less.
The width c of the low basis weight portion 25 is preferably 5 mm or more, more preferably 7.5 mm or more, and preferably 30 mm or less, more preferably 20 mm or less.

The basis weight of the high basis weight part 4 is preferably 250 g / m ² or more, more preferably 300 / m ² or more, and preferably 700 g / m ² or less, from the viewpoint of sufficiently securing the liquid absorption capacity. It is preferably 650 g / m ² or less.
The basis weight of the low basis weight portion 25 is preferably 90 g / m ² or more, more preferably 100 g / m ² or more, and preferably 100 g / m ² or more, from the viewpoint of appropriately lowering the rigidity while making the liquid absorbency suitable. It is 350 g / m ² or less, more preferably 300 g / m ² or less.

The thickness of the high basis weight, high thickness portion 41 is preferably 2 mm or more, more preferably 2.5 mm or more, and preferably 9 mm or less, more preferably 8 mm or less.
The thickness of the high basic weight low thickness portion 42 and the low basic weight portion 25 is preferably 1.5 mm or more, more preferably 2 mm or more, and preferably 6 mm or less, more preferably 5 from the viewpoint of reducing the feeling of stiffness. It is 0.5 mm or less.
The difference between the thickness of the high basis weight and high thickness portion 41 and the thickness of the high basis weight and low thickness portion 42 is preferably 0.5 mm or more, from the viewpoint of the fitting property of the high basis weight and high thickness portion 41 to the excretory part, and It is preferably 1 mm or more, and preferably 5 mm or less, more preferably 4 mm or less.

The width of the peripheral groove portion 29, the vertical groove portion 27, and the horizontal groove portion 28 is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 10 mm or less, more preferably 5 mm or less.
It is arranged at the boundary between the intermediate core portion 22 and the rear core portion 23 (front core portion 21), in other words, in the Y-axis direction between the high basis weight portion 4 and the rear core portion 23 (front core portion 21). The width of the boundary groove 61 (60), which is extended and arranged, is preferably 1.5 mm or more, more preferably 2 mm or more, and preferably 3.5 mm or less, more preferably 3 mm or less.
The width of the wide vertical groove portion 27a is preferably 1 mm or more, more preferably 2 mm or more. Further, the width of the wide vertical groove portion 27a is preferably 1.5 times or more the groove width of the narrow vertical groove portion 27b, and more preferably twice or more in the widthwise central region of the rear core portion 23. It is preferable from the viewpoint of making the rigidity appropriately smaller than the lateral side regions.

The basis weight of the peripheral groove portion 29, the vertical groove portion 27, and the horizontal groove portion 28 is lower than the basis weight of the block portion, and is, for example, 25 g / m ² or more. And it is 300 g / m ² or less.
As shown in FIG. 3, among the three wide vertical groove portions 27a arranged in the widthwise central region 65 of the rear core portion 23, the bottom portion thickness t1 of the wide vertical groove portion 27a arranged in the center is equal to the other two wide width portions. It is thinner than the bottom thickness t2 of the vertical groove portion 27a. The bottom thickness t1 of the wide vertical groove portion 27a arranged in the center is preferably 0.25 mm or more, more preferably 0.5 mm or more, and preferably 5 mm or less, more preferably 4 mm or less.

(Method of measuring the width of each part of the absorbent core)
The high basis weight and high thickness portion, the high basis weight and low thickness portion, the low basis weight portion, and the width of the lateral outside are such that the absorbent core is placed horizontally and the measurement magnification is adjusted by a microscope (VHX-1000 manufactured by KEYENCE). The width is measured by enlarging the skin facing surface 20a.

(Measurement method of basis weight of each part of the absorbent core)
Each part of the absorbent core 20 to be measured is cut using a single-edged razor manufactured by Feather, and small pieces are obtained so as to have a predetermined area. The weight of these small pieces is measured using an electronic balance (electronic balance GR-300 manufactured by A & D Co., precision: 4 digits after the decimal point). The basis weight of the small piece is calculated by dividing the obtained weight by the area of the small piece of each part. The average of the basis weights of five small pieces is set as the basis weight for each part.

(Method for measuring the thickness of each part of the absorbent core)
The thickness of the absorbent core to be measured is measured by measuring the thickness of a piece cut out to measure the basis weight of each part. A small piece cut out from the absorbent core is pressed with a pressure of 5 kPa for 10 minutes, and the measurement is performed immediately after the weight is removed. A circular aluminum plate having a diameter of 25 mm, a thickness of 3 mm, and a mass of 2.45 g is placed horizontally and quietly in the central region of the sample after the weight is removed, and a non-contact laser displacement meter (laser head LK-G30, displacement, manufactured by KEYENCE) is placed. LK-GD500) is used to measure the thickness of the sample. When the size of the cut out piece is small and it is difficult to measure with a non-contact type laser displacement meter, the cross section of the cut sample is, for example, 20 to 100 using a microscope (VHX-1000 manufactured by KEYENCE). It may be observed and measured at double magnification.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention.
For example, in the above-described embodiment, an example of a sanitary napkin is shown as the absorbent article, but the absorbent article is not limited to this. The absorbent article of the present invention may be, for example, an incontinence pad or a sheet of a vaginal discharge.
In addition, in the above-described embodiment, an example in which the three wide vertical groove portions 27a are provided in the rear core portion 23 has been described. However, as in the absorbent core 70 illustrated in FIG. One wide vertical groove portion 27a may be provided, and the other vertical groove portions may be narrow vertical groove portions 27b.
Further, in the above-described embodiment, the absorbent core 20 has a constricted shape, but like the absorbent core 71 shown in FIG. 6, it has a uniform width over the entire length in the front-rear direction. It may be.
5 and 6, the same components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted. In this way, the rear core portion 23 is provided with at least one wide vertical groove portion 27a behind the high basis weight / thickness portion 41, and is further provided with the narrow vertical groove portion 27b. Obtainable.

Further, in the above-described embodiment, the high basis weight portion 4 projects upward in the thickness direction Z, but instead of this, as shown in FIG. 7, the high basis weight portion 4 projects downward in the thickness direction Z. Good. Further, in the above-described embodiment, various groove portions such as the vertical groove portion 27, the horizontal groove portion 28, the peripheral groove portion 29, and the boundary grooves 60 and 61 provided in the absorbent core 20 have openings on the upper side in the thickness direction Z. Instead of this, as shown in FIG. 7, an object having an opening on the lower side in the thickness direction Z may be used.
Regarding the above-described embodiment of the present invention, the following supplementary notes are further disclosed.

(1)
An absorbent article comprising an absorbent core having a front core portion and a rear core portion positioned on both end sides in the front-rear direction, and an intermediate core portion positioned between the front core portion and the rear core portion, The intermediate core portion is located in the widthwise central region and has a high basis weight portion having a higher basis weight than the front core portion and the rear core portion, and is located in both widthwise side regions, the high basis weight portion. anda low basis weight portion having a lower basis weight, the high basis weight portion, the high basis weight, high thickness portion located at the widthwise central portion in the width direction on both sides of the high basis weight, high-thickness section A high basis weight low thickness portion having a thickness smaller than that of the high basis weight high thickness portion positioned, and the rear core portion extends along the front-rear direction, and is behind the high basis weight high thickness portion. An absorbent article having a wide vertical groove portion located at, and a vertical groove portion narrower than the wide vertical groove portion.
(2)
The absorbent article according to (1), wherein the rear core portion extends in the front-rear direction and further has a vertical groove portion wider than the narrow vertical groove portion behind the high basis weight low thickness portion.
(3)
The narrow vertical groove portion is located on both sides in the width direction with the wide vertical groove portion located behind the high basis weight high thickness portion and the high basis weight low thickness portion interposed therebetween (2). Absorbent article.
(4)
The thickness of the bottom portion forming the wide vertical groove portion located behind the high basis weight high thickness portion is thinner than the bottom portion of the wide vertical groove portion located behind the high basis weight low thickness portion ( The absorbent article according to 2) or (3).
(5)
The intermediate core portion further includes a vertical groove portion having a lower basis weight than the high basis weight portion, the vertical groove portion extending along the front-rear direction at the center of the high basis weight and high thickness portion in the width direction, (1) to (4) The absorptive article according to any one of 1).
(6)
Any of (1) to (5), wherein the absorbent core has a boundary groove portion having a lower basis weight along the width direction than the low basis weight portion at a boundary between the intermediate core portion and the rear core portion. The absorbent article according to any one of the above.
(7)
The absorbent article according to (6), wherein the rear end portion of the high basis weight portion and the boundary groove portion are adjacent to each other.
(8)
Any of (1) to (6), wherein the absorbent core has a boundary groove portion having a lower basis weight along the width direction than the low basis weight portion at a boundary between the front core portion and the intermediate core portion. The absorbent article according to any one of the above.
(9)
The absorbent article according to (8), wherein the front end portion of the high basis weight portion and the boundary groove portion are adjacent to each other.
(10)
Any of (1) to (7), wherein the intermediate core portion has a peripheral groove portion formed between the high basis weight portion and the low basis weight portion along at least the front-back direction outer edge of the high basis weight portion. The absorbent article according to any one of the above.
(11)
The absorbent article according to (10), wherein the peripheral groove portion is a groove having a lower basis weight than the low basis weight portion, the groove being provided along a side edge of the high basis weight and low thickness portion.
(12)
The absorbent core, at the boundary between the intermediate core portion and the rear core portion or the front core portion, has a boundary groove portion having a lower basis weight along the width direction than the low basis weight portion, The absorbent article according to (10) or (11), wherein the peripheral groove portion communicates with the boundary groove portion.
(13)
The width of the high basis weight portion arranged in the widthwise central region of the intermediate core portion is preferably 15 mm or more, more preferably 20 mm or more, and preferably 60 mm or less, more preferably 50 mm or less. The absorbent article according to any one of (1) to (12).
(14)
The width of the high basis weight, high thickness portion is preferably 10 mm or more, more preferably 15 mm or more, and preferably 40 mm or less, more preferably 30 mm or less, any of (1) to (13) The absorbent article according to any one of the above.
(15)
The absorbent article according to any one of (1) to (14), wherein the width of the high basis weight and low thickness portion is narrower than the width of the high basis weight and high thickness portion.
(16)
The width of the high basis weight / low thickness portion is preferably 2 mm or more, more preferably 3 mm or more, and preferably 10 mm or less, more preferably 7.5 mm or less, any of (1) to (15) The absorbent article according to any one of the above.
(17)
The width of the low basis weight portion is preferably 5 mm or more, more preferably 7.5 mm or more, and preferably 30 mm or less, more preferably 20 mm or less, any one of (1) to (16) The absorbent article according to 1.
(18)
The absorbent article according to any one of (1) to (17), wherein the width of the wide vertical groove portion is preferably 1 mm or more, more preferably 2 mm or more.
(19)
Absorbency according to any one of (1) to (18), wherein the width of the wide vertical groove portion is 1.5 times or more, preferably 2 times or more, the groove width of the narrow vertical groove portion. Goods.
(20)
The absorbent article according to any one of (1) to (19), wherein the width of the intermediate core portion is smaller than both the width of the front core portion and the width of the rear core portion.
(21)
The front core portion extends in the front-rear direction, and has a wide vertical groove portion located in front of the high basis weight high thickness portion, and a vertical groove portion narrower than the wide vertical groove portion, The absorbent article according to any one of (1) to (20).
(22)
The absorbent article according to any one of (1) to (21), wherein the high basis weight portion has a shape in which a rear end portion in the front-rear direction has a width narrower than a central portion in the front-rear direction.
(23)
The absorbent article according to any one of (1) to (22), wherein the absorbent article is a sanitary napkin.

1, 70, 71 ... Napkin (absorbent article)
4 ... High basis weight part 11 ... Absorber 20 ... Absorbent core 21 ... Front core part 22 ... Intermediate core part 23 ... Rear core part 25 ... Low basis weight part 27a ... Wide vertical groove part (wide vertical groove part)
27b ... Narrow vertical groove (narrow vertical groove)
41 ... High basis weight / high thickness section 42 ... High basis weight / low thickness section

Claims (5)

An absorbent article comprising an absorbent core having a front core portion and a rear core portion positioned on both end sides in the front-rear direction, and an intermediate core portion positioned between the front core portion and the rear core portion, ,
The intermediate core portion is located in the widthwise central region, and has a high basis weight portion having a higher basis weight than the front core portion and the rear core portion, and is located in both widthwise side regions, and is higher than the high basis weight portion. A low basis weight portion having a low basis weight,
The high basis weight portion, the high basis weight and high thickness portion, the high basis weight the high basis weight, high basis is thinner thickness than the high thickness portion located at both sides in the width direction of the high-thickness portion located at the widthwise central portion And a low-thickness portion,
The rear core portion has a wide vertical groove portion that extends along the front-rear direction and is located behind the high basis weight high thickness portion, and a vertical groove portion that is narrower than the wide vertical groove portion. ,
The said rear core part is extended along the front-back direction, and further has a vertical groove part wider than the said narrow vertical groove part in the back of the said high basic weight low thickness part. The vertical narrow groove portion is located on both sides in the width direction with the wide vertical groove portion located behind the high basis weight high thickness portion and the high basis weight low thickness portion interposed therebetween. Absorbent article. The thickness of the bottom portion forming the wide vertical groove portion located behind the high basis weight high thickness portion is thinner than the thickness of the bottom portion of the wide vertical groove portion located behind the high basis weight low thickness portion. Item 3. The absorbent article according to item 2. The intermediate core portion further has a vertical groove portion having a lower basis weight than the high basis weight portion, the vertical groove portion extending along the front-rear direction at the center in the width direction of the high basis weight high thickness portion. The absorbent article according to any one of claims. The absorbent core has a boundary groove portion having a lower basis weight along the width direction than the low basis weight portion at a boundary between the intermediate core portion and the rear core portion. The absorbent article according to item 1.

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