TWI758634B - Absorbent article - Google Patents

Abstract

An absorbent article according to one aspect of the present invention includes an absorbent core having a front core part and a rear core part located on both end sides in the front-rear direction, and the front core part and the rear part located on the front side. Intermediate core parts between core parts. The above-mentioned intermediate core portion has: a high basis weight portion located in the central region in the width direction, and the basis weight is higher than the above-mentioned front core portion and the above-mentioned rear core portion; and a low basis weight portion located in the width direction both side regions , and has a lower basis weight than the above-mentioned high basis weight part. The above-mentioned high-basis-weight portion has: a high-basis-weight and high-thickness portion, which is located at a central portion in the width direction; Heavy and high thickness part is thin. The rear core portion has a wide vertical groove portion extending in the front-rear direction and located behind the high basis weight and high thickness portion, and a narrow vertical groove portion narrower than the wide vertical groove portion .

Description

absorbent articles

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

Absorbent articles of the type that are used inside underwear, such as menstrual napkins, have an absorbent core for absorbing liquids such as menstrual blood. For example, in the absorptive core described in Patent Document 1, a protruding part having a shape long in the longitudinal direction of the absorptive core is partially provided from the excretion part opposing part to a part of the rear part, and further, along the Grooves are provided so as to wear the wearer's skin.

[Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2015-112235

An absorbent article according to one aspect of the present invention includes an absorbent core having a front core portion and a rear core portion located on both end sides in the front-rear direction, and the front side. An intermediate core part between the core part and the above-mentioned rear core part.

The above-mentioned intermediate core portion has: a high basis weight portion located in the central region in the width direction, and the basis weight is higher than the above-mentioned front core portion and the above-mentioned rear core portion; and a low basis weight portion located in the width direction both side regions , and has a lower basis weight than the above-mentioned high basis weight part.

The above-mentioned high-basis-weight portion has: a high-basis-weight and high-thickness portion, which is located in a central portion in the width direction; Heavy and high thickness part is thin.

The rear core portion has a wide vertical groove portion extending in the front-rear direction and located behind the high basis weight and high thickness portion, and a narrow vertical groove portion narrower than the wide vertical groove portion .

1: Absorbent articles (sanitary napkins)

4: High basis weight

11: Absorber

12: front sheet

13: Back sheet

14: Side Sheets

16: Compression groove part

20: Absorbent core

20a: Skin Opposite Side

21: Front core part

21a: inclined part

22: Intermediate core body

23: Rear core part

23a: Inclined part

25: Low Basis Weight

27: Longitudinal groove part

27a: Wide longitudinal groove part

27b: Narrow longitudinal groove part

27c: Longitudinal groove part

28: Horizontal groove part

29: Circumferential groove part

30: Chip material

41: High basis weight and high thickness part

42: High basis weight and low thickness part

45: Front end

46: rear end

60: Junction groove part

61: Junction groove part

65: Central area in the width direction

66: Side area in the width direction

70: Absorbent core

71: Absorbent core

291: Straight line

292: Bending part

D1: width

D2: width

D3: width

F: rear wing

L1: imaginary line segment

L2: imaginary line segment

M: body

M1: Front area

M2: Middle area

M3: rear area

P1: Junction

P2: Junction

R1: Region

R2: Region

W: wing

X: Front and rear direction

Y: width direction

Z: vertical direction (thickness direction)

Fig. 1 is a plan view of an absorbent article according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of the intermediate core portion of the absorbent article of Fig. 1 cut along line II-II, and the illustration of the compression groove is omitted in this figure.

Fig. 3 is a schematic cross-sectional view of the square core portion of the absorbent article of Fig. 1 after being cut along the line III-III.

Fig. 4 is a plan view showing an absorbent core forming part of the absorbent article of Fig. 1 .

Fig. 5 is a plan view of an absorbent core of another embodiment.

Fig. 6 is a plan view of the absorbent core of yet another embodiment.

7 is a cross-sectional view of an absorber for explaining another example of arrangement of the absorber in the absorbent article.

Absorbent articles such as menstrual napkins are worn so that the rear portion thereof corresponds to the buttocks of the wearer. For example, in a state where the wearer is lying on his back with his back face up, the shape of the buttocks is deformed by the squeezing of the bedding compared to when the wearer is standing, so that the part facing the excretion part of the absorbent article faces the rear. It is easy to create a gap between the skin and the absorbent article, and there is a situation where liquid leakage occurs.

The present invention relates to an absorbent article capable of suppressing liquid leakage.

[The overall composition of sanitary napkins]

Hereinafter, in each drawing, the X-axis direction corresponds to the front-rear direction of the absorbent article 1, the Y-axis direction corresponds to the width direction, and the Z-axis direction corresponds to the vertical direction (thickness direction).

The absorbent article 1 of the present embodiment is constituted as a menstrual sanitary napkin, which is hereinafter referred to as a sanitary napkin 1 . The sanitary napkin 1 of the present embodiment can also 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 sanitary napkin 1 is provided with the main body M, a pair of wing parts W, and a pair of rear wing parts F in this embodiment.

The main body M extends in the front-rear direction X, and is fixed to the inner surface (wearing surface) of the wearer's underwear when worn. The main body M has an absorber 11 and has a function of absorbing liquid substances (hereinafter, also referred to as "liquid") such as menstrual blood of the wearer.

The main body M has a front area M1, a middle area M2, and a rear area M3 divided along the front-rear direction X.

The front area M1 is an area located in front of the middle area M2 (the wearer's belly), and is configured to face the front of the wearer's excretory portion when wearing.

The middle area M2 is formed so as to face the excretory part of the wearer when wearing. Furthermore, the middle area M2 can be located in the front of the main body M as shown in the figure, or can also be located in the central part of the main body M. As shown in FIG.

The rear region M3 is arranged in the region behind the middle region M2 (the back side of the wearer), and is configured to face the rear of the wearer's excretory portion during wearing.

The wing part W is comprised so that it may protrude largely toward the outer side in the width direction from the intermediate area M2.

The rear wing portion F is configured to bulge out from the rear region M3 toward the outer side in the width direction.

Furthermore, the sanitary napkin 1 may not have at least one of the wing portion W and the rear wing portion F.

[The composition of each part of the sanitary napkin]

As shown in FIGS. 1 to 3 , the sanitary napkin 1 includes an absorber 11 , a surface sheet 12 , a back sheet 13 , a pair of side sheets 14 , and a compression groove portion 16 . In the main body M, the sanitary napkin 1 has a structure in which the back sheet 13, the absorber 11, and the front sheet 12 are laminated. The sanitary napkin 1 is constituted so that the surface sheet 12 comes into contact with the wearer's skin when worn.

The absorber 11 has a front-rear direction in the X-axis direction, and is arranged in the thickness direction center part of the sanitary napkin 1 . The absorber 11 absorbs the liquid from the surface on the surface sheet 12 side, diffuses the liquid inside, and holds the liquid. The absorber 11 will be described later.

The surface sheet 12 is constituted as a liquid-permeable sheet, and is arranged on the absorber 11 . The surface sheet 12 constitutes the upper outer surface of the sanitary napkin 1 in the thickness direction in the body M.

The back sheet 13 is arranged to face the front sheet 12 in the thickness direction with the absorber 11 interposed therebetween. The back sheet 13 constitutes the lower outer surface in the thickness direction of the sanitary napkin 1 . The back sheet 13 is joined to the front 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 face each other in the width direction with the surface sheet 12 interposed therebetween, and are arranged on the peripheral edge in the width direction of the sanitary napkin 1 .

The pair of compression groove portions 16 are formed as linear grooves formed by subjecting the absorber 11 and the surface sheet 12 to compression processing.

(Basic structure of absorber)

As shown in FIGS. 2 and 3 , the absorber 11 has an absorptive core 20 and a core wrapping material 30 .

The absorbent core 20 has the function of absorbing and retaining liquid. The absorptive core 20 may be formed of, for example, a fiber aggregate containing hydrophilic fibers such as pulp fibers, or may have a configuration in which the fiber aggregate holds a water-absorbent polymer. Hereinafter, the member which comprises the absorptive core 20 is called an absorption member.

As shown in FIGS. 2 and 3 , the core wrap material 30 is wound in the width direction of the absorptive core 20 so as to cover the front and back surfaces of the absorptive core 20 . The length along the X-axis direction of the core wrapping material 30 is formed to be equal to the length (full length) in the front-rear direction X of the absorptive core 20, but is not limited to this, and may be longer than the entire length of the absorptive core 20 , or even shorter.

The core wrapping material 30 coats the absorptive core 20, and has, for example, a function of maintaining the shape of the absorptive core 20, and the like. The core wrapping material is formed of, for example, a thin and soft paper such as toilet paper, a liquid-permeable nonwoven fabric, and the like. The core wrapping material 30 may be composed of a single sheet, or may be composed of a plurality of sheets. The core sheet 30 can also be bonded to the front sheet 12 and the back sheet 13 by, for example, an adhesive coated in a specific pattern, or the like.

(Constitution of Absorbent Core)

As shown in FIG. 4, the absorptive core 20 has the front core part 21 located in the front area|region M1, the intermediate|middle core part 22 located in the intermediate area M2, and the rear core part 23 located in the rear area M3. The front core part 21 and the rear core part 23 are located on both end sides of the absorptive core 20 in the front-rear direction X, and the intermediate core part 22 is located between the front core part 21 and the rear core part 23 . The intermediate core portion 22 reaches the front side of the rear region M3 from the rear side of the front region M1 via the intermediate region M2. The absorptive core 20 has a left-right symmetrical plane shape in the width direction.

In FIG. 4 , the widths D1 , D2 , and D3 that are the widthwise dimensions of the front core portion 21 , the intermediate core portion 22 , and the rear core portion 23 are shown. The width D2 of the middle 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 absorptive core 20 has an inward shrinkage in the front-back direction X intermediate part.

The front core part 21 has the inclined part 21a at the rear end, and the rear core part 23 has the inclined part 23a at the front end. The inclined 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 addition, in this embodiment, although the absorptive core 20 which has an indented shape is mentioned as an example and demonstrated, it may be an absorptive core whose width is uniform in the front-back direction X.

The middle core portion 22 is located at the excretory portion opposite portion disposed opposite to the wearer's excretory portion, that is, the vaginal opening when the sanitary napkin 1 is worn. The front core portion 21 is arranged on the front side (abdominal side) of the wearer from the middle core portion 22 , and the rear core portion 23 is arranged on the back side (back side) of the wearer from the middle core portion 22 .

A plurality of grooves are provided on the skin-facing surface 20a side of the absorptive core 20 .

Specifically, the front core portion 21 , the intermediate core portion 22 , and the rear core portion 23 are provided with a vertical groove portion 27 and a lateral groove portion 28 , and the intermediate core portion 22 is provided with a peripheral groove portion. 29.

Furthermore, the boundary groove portion 60 is provided at the boundary portion P1 between the front core portion 21 and the intermediate core portion 22 , and the boundary groove portion 60 is provided at the boundary portion P2 between the intermediate core portion 22 and the rear core portion 23 . groove portion 61 . The boundary portion P1 and the boundary portion P2 are respectively positioned so as to traverse the absorptive core 20 in the width direction.

It should be noted that the boundary portion P1 refers to a portion between the front core portion 21 and the intermediate core portion 22 that does not belong to either, and the boundary portion P2 refers to the portion between the rear core portion 23 and the intermediate core portion 22 . which are not part of either. However, since the boundary groove part is not required in this invention, in the absorbent core in which the boundary groove part does not exist, the boundary part which is "a part which does not belong to either" does not exist.

The absorbent core 20 is formed in a block shape by the longitudinal groove portion 27 , the lateral groove portion 28 , the peripheral groove portion 29 , the boundary groove portions 60 and 61 of which the basis weight of the absorbent member is relatively low and low basis weight. Divide into plural. These groove parts are formed so as to sink downward from the upper surface in the thickness direction (the surface on the wearer's skin side) with respect to the block part divided into blocks. On the other hand, the square portion is configured to protrude upward in the thickness direction.

In the absorptive core 20, compared with the area|region of the square part in which the groove part is not formed, the thickness of the area|region in which the groove part is formed, ie, the bottom part in which the groove part is formed, is relatively thin. Compared with the square part, the shape The basis weight of the bottom portion of the groove portion is relatively low, and the rigidity of the bottom portion of the groove portion is decreased as compared with that of the square 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 a deformation starting point.

In the following description, the basis weight of the front core part 21 , the middle core part 22 and the rear core part 23 refers to the basis weight of the square part excluding the groove parts 27 , 28 , 29 , 60 and 61 .

The vertical groove portions 27 extend in the front-rear direction X, and a plurality of vertical groove portions 27 are arranged at intervals in the width direction. The vertical groove portion 27 is formed over the entire length in the front-rear direction X so as to divide each of 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 along the front-rear direction X at intervals. The lateral groove portion 28 is formed over the entire length in the width direction Y so as to divide each of the front core portion 21 , the intermediate core portion 22 , and the rear core portion 23 in the front-rear direction X. In addition, in this embodiment, the boundary groove parts 60 and 61 formed in the boundary parts P1 and P2 are not included in the lateral groove part 28 . The length of the boundary groove portions 60 and 61 in the front-rear direction X, that is, the groove width is wider than 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 to be described later.

In addition, the shape or arrangement of the vertical groove portion 27, the horizontal groove portion 28, and the peripheral groove portion 29 are not limited to those shown in FIG. function, etc., and set it appropriately.

(Configuration of the intermediate core body)

As shown in FIGS. 2 and 4 , the intermediate core portion 22 has a high basis weight portion 4 having a higher basis weight of the absorbent member, and a low basis weight portion 25 having a lower basis weight of the higher basis weight portion 4 . The basis weight of the high basis weight part 4 is higher than the previous The basis weight of the square core portion 21 and the rear core portion 23 is high.

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. As shown in FIG. The low basis weight portion 25 is located in each of the regions 66 and 66 on both sides in the width direction of the intermediate core portion 22 . The pair of low basis weight portions 25 extend in the front-rear direction X, and exist opposite to each other in the width direction with the high basis weight portion 4 interposed therebetween. The widthwise both side regions 66 and 66 are located further outside in the widthwise direction than the widthwise central region 65 .

The high basis weight portion 4 is arranged so as to face the excretory portion of the wearer when the sanitary napkin 1 is worn.

Furthermore, the high basis weight portion 4 has a high basis weight high thickness portion 41 and a high basis weight low thickness portion 42 . The high basis weight and high thickness portion 41 is located at the center portion in the width direction Y. As shown in FIG. The high-basis-weight and low-thickness portions 42 are located on both sides of the high-basis-weight and high-thickness portion 41 in the width direction Y, and there are a pair opposite to each other along the width direction Y with the high-basis-weight and high-thickness portions 41 interposed therebetween.

In FIG. 4, the high basis weight part 4 is shown by a dot pattern. In the high basis weight portion 4 , the density of the dot pattern of the high basis weight low thickness portion 42 is made higher than that of the basis weight high thickness portion 41 to be expressed more densely.

In the middle core portion 22, the high basis weight and high thickness portion 41, the high basis weight and low thickness portion 42, the peripheral groove portion 29 and the Low basis weight section 25 .

As shown in FIG. 2 , the high-basis-weight and high-thickness part 41 in the high-basis-weight part 4 is formed thicker in the lower-basis-weight part 25 and the high-basis-weight low-thickness part 42, and faces upward in the thickness direction (the side of the front sheet 12 ). )protrude. Thereby, good fit between the central portion of the middle region M2 of the sanitary napkin 1 corresponding to the high basis weight and high thickness portion 41 and the excretory portion of the wearer can be ensured.

In the sanitary 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 high thickness portion 41 and the high basis weight low thickness portion 42 do not need to be exactly the same, and from the viewpoint of absorption performance, the difference between the higher basis weight and the lower basis weight is divided by the basis weight The higher value is preferably within 20%, more preferably within 10%. The density of the absorption member of the high-basis-weight and low-thickness portion 42 is higher than that of the high-basis-weight high-thickness portion 41, which is high density. The thickness of the high-basis-weight and low-thickness portion 42 is thinner than that of the high-basis-weight high-thickness portion 41 , which is equal to the low-basis weight portion 25 . The high basis weight and low thickness portion 42 is located on the outer side in the width direction of the high basis weight and high thickness portion 41 , and is located between the high basis weight and high thickness portion 41 and the low basis weight portion 25 .

Among the square portions provided in the middle core portion 22 , the high basis weight and low thickness portion 42 has the highest rigidity, the high basis weight and high thickness portion 41 has the highest rigidity, and the low basis weight portion 25 is the lowest.

The high-basis-weight high-thickness portion 41 and the high-basis-weight 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 of disposing the high-density high-basis-weight low-thickness part 42 in the high-basis-weight part 4 is not particularly limited. For example, after forming the high-basis-weight part with a uniform thickness, the high-basis-weight part is partially pressed and compressed, whereby the high-basis-weight high-basis-weight part 41 and the high-basis-weight low-thickness part 42 can be formed. Section 4. In this case, the compressed region becomes the high-basis-weight and low-thickness portion 42 , and the region not subjected to compression processing becomes the high-basis-weight and high-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 respectively arranged on both sides of the high basis weight portion 4 in the width direction. The low basis weight portion 25 is configured to sink downward from the upper surface of the high basis weight and high thickness portion 41 . The low basis weight portion 25 is formed with the same thickness as the high basis weight low thickness portion 42 .

In the intermediate core portion 22, a peripheral groove portion 29, one vertical groove portion 27c, and four lateral groove portions 28 are provided. Here, in order to distinguish it from the vertical groove portion 27 provided in the other core body portion, the vertical groove portion located in the middle core body portion 22 will be referred to as the vertical groove portion 27c for description, unless there is no need for special distinction. , it is simply referred to as the vertical groove portion 27 .

As shown in FIG. 4 , the peripheral groove portion 29 is formed between the high basis weight portion 4 and the low basis weight portion 25 so as to surround at least the periphery in the front-rear direction X of the high basis weight portion 4 . The peripheral groove portion 29 is provided along the side edge of the high basis weight and low thickness portion 42 . The basis weight of the peripheral groove portion 29 is lower than that of the low basis weight portion 25 .

The peripheral groove portion 29 is provided over 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 has the front end portion 45 and the rear end portion 46 of the high basis weight portion 4 in a substantially semicircular shape. In addition, it is not limited to a semicircular shape, and a shape that can disperse the force acting on the inside and outside of the plane, such as a triangle shape, a trapezoid shape, or a combination of an arc and a straight line, is desirable.

The peripheral groove portion 29 and the boundary groove portion provided at the boundary portion P2 ( P1 ) of the intermediate core portion 22 and the rear core portion 23 (the front core portion 21 and the intermediate core portion 22 ) and extending in the width direction 61(60) is connected.

The rear end portion 46 of the high basis weight portion 4 extending in the front-rear direction X is adjacent to the boundary groove portion 61 , and the front end portion 45 of the high basis weight portion 4 is adjacent to the boundary groove portion 60 .

The vertical groove portion 27c is located at the center of the width direction Y of the middle core portion 22 and the center of the width direction Y of the high basis weight and high thickness portion 41, and is located in the width direction of each of the front core portion 21 and the rear core portion 23. The vertical grooves 27 in the center of Y are located on the same straight line and communicate with each other.

The four lateral groove portions 28 provided in the intermediate core portion 22 are arranged at equal intervals and parallel to each other so as to traverse the intermediate core portion 22 along the width direction Y. As shown in FIG. The lateral groove portion 28 is arranged so as to be orthogonal to the linear portion 291 of the peripheral groove portion 29 .

(Constitution of the rear core part)

Next, the rear core portion 23 will be described. The absorptive core 20 has the vertical groove part 27 and the horizontal groove part 28 of two widths. 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 width vertical groove portion is referred to as a narrow vertical groove portion 27b. Furthermore, when there is no need 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 in the rear core portion 23 at equal intervals.

Five vertical groove portions 27 are arranged in the rear core portion 23 at equal intervals. The five vertical groove portions 27 of the rear core portion 23 are formed over the entire length in the front-rear direction X. As shown in FIG. Among the five vertical groove parts 27, the three vertical groove parts 27 located in the center part of the width direction Y are set as the wide vertical groove parts 27a with a wider width, and the vertical groove parts 27 located on the left and right sides in the width direction Y The groove portion 27 is formed as a narrow vertical groove portion 27b with a narrow width, and the rigidity distribution in the width direction of the rear core portion 23 is adjusted. Here, the so-called arrangement pitch refers to the distance between the centers of adjacent vertical groove portions.

Among the three wide vertical groove portions 27 a, one wide vertical groove portion 27 a located at the center in the width direction Y (hereinafter, referred to as the central wide vertical groove portion 27 a ) is located in the width direction of the intermediate core portion 22 The center of Y is located behind the high-basis-weight and high-thickness portion 41 .

Here, the term "behind the high-basis-weight and high-thickness portion 41" refers to a drawing that passes through a height as shown in Fig. 4 . When a pair of imaginary line segments L1 and L1 extend along the front-rear direction on both side edges of the base weight high-thickness portion 41 that define the widest width, the rear core portion 23 is sandwiched by a pair of imaginary line segments L1 and L1 area R1.

The term "located behind the high-basis-weight and high-thickness portion 41" only needs to be located in the region R1 at least a part of the central wide-width vertical groove portion 27a. That is, of course, it includes the form in which the central wide vertical groove portion 27a is completely within the region R1, and also includes a part of the central wide vertical groove portion 27a within the region R1, and the other portion is located outside the width direction Y of the region R1. form.

Among the three wide vertical groove portions 27a, the wide vertical groove portions 27a located on the left and right sides in the width direction Y (hereinafter, referred to as left and right wide vertical groove portions 27a) are located behind the high basis weight and low thickness portion 42, respectively. square.

Here, the term “behind the high-basis-weight and low-thickness portion 42” refers to the direction along the front-rear direction as shown in FIG. When one pair of imaginary line segments L2 and L2 is extended, a region R2 of the rear core portion 23 sandwiched by the imaginary line segments L1 and L2 is formed.

The term "located behind the high-basis-weight and low-thickness portion 42" may be used as long as at least a part of each of the left and right wide vertical groove portions 27a is located in the region R2. That is to say, of course, including the form in which each of the left and right wide vertical groove portions 27a is completely within the region R2, also included in each of the left and right wide vertical groove portions 27a, a part is located in the region R2, and the other part is located in the region R2. The shape of the outer side in the width direction.

In addition, in the absorptive core 20, the inner side of the width direction Y rather than the imaginary line segment L2 is the center area|region 65, and the outer side is the side area|region 66. Regarding the "portion with the largest length in the width direction of the high basis weight portion 4", in consideration of the fit to the groin portion of the wearer, it is preferable to exist in the middle The central portion in the longitudinal direction of the core portion 22 .

As shown in FIG. 3, the thickness t1 of the bottom of the groove forming the central wide vertical groove portion 27a of the absorbent core 20 is thinner than the thickness t2 of the bottom of the groove forming the left and right wide vertical groove portions 27a. In this embodiment, since the heights of the blocks provided in the rear core portion 23 are the same, in other words, the groove depth of the central wide vertical groove portion 27a is greater than the groove depth of the left and right wide vertical groove portions 27a. The groove depth is deep.

In the front core portion 21 , similarly to the rear core portion 23 , three wide vertical groove portions 27 are provided in the center portion in the width direction, and the three wide vertical groove portions 27 are interposed therebetween. A narrow longitudinal groove portion 27 is provided on each of the two sides. In the front core portion 21 , the central wide vertical groove portion 27 among the three wide vertical groove portions 27 is located in front of the high basis weight and high thickness portion 41 .

[Function and effect of this embodiment]

The intermediate core part 22 of the absorptive core 20 of this embodiment has the high basis weight part 4 in the center of the width direction Y, and has the low basis weight part 25 on both sides. The low basis weight portion 25 has a lower basis weight and lower rigidity than the high basis weight portion 4 . When the middle core portion 22 of the absorbent core 20 receives an external force from the wearer's legs on the outer side in the width direction toward the inner side in the width direction Y, the low basis weight portion 25 deforms first and acts on the absorbent core Forces beyond 20 are absorbed or mitigated. Therefore, the external force transmitted to the high basis weight portion 4 is reduced, the deformation of the high basis weight portion 4 caused by the external force is suppressed, and the liquid leakage caused by the deformation of the high basis weight portion 4 is suppressed.

In addition, since the high basis weight portion 4 has a higher basis weight of the absorbent member than the low basis weight portion 25, it has a sufficient absorption capacity, so that the liquid can be prevented from reaching the side edges of the absorptive core 20, and the side edges of the absorbent core 20 can be restrained. leak.

In addition, the high basis weight portion 4 has a high basis weight and low thickness portion 42 obtained by reducing the thickness by subjecting both sides in the width direction Y to compression processing. By reducing the thickness in this way, it is possible to reduce the rigidity when wearing, and bring a comfortable feeling to the wearer.

The high basis weight and high thickness portion 41 is formed so as to protrude toward the skin over the entire length of the intermediate core portion 22 . Thereby, when the sanitary napkin 1 is worn, a good fit feeling between the high basis weight and high thickness portion 41 and the excretion portion can be ensured.

Moreover, although the thickness of the high-basis-weight low-thickness part 42 is thinner than the high-basis-weight high-thickness part 41, an absorption member is comprised more closely, and it is excellent in the force of attracting a liquid. The absorptive core 20 has the function of attracting the liquid from the skin surface side, and the force for attracting the liquid is generated by the capillary force of the absorptive core 20, and the capillary force is proportional to the density of the absorbent members constituting the absorptive core. proportionally stronger. That is, by providing the high-density, high-basis-weight, low-thickness portion 42, capillary force acts, and the liquid is easily sucked from the skin surface side, and the sucked liquid is prevented from reaching the side edge of the absorptive core.

Furthermore, since the compressed high-density high-basis-weight low-thickness portion 42 is extended in the front-rear direction X over the entire length of the intermediate core portion 22 serving as the excretion-part opposing portion, the high-basis-weight and low-thickness The liquid absorbed in the portion 42 is guided in the diffusion direction so as to be diffused in the front-rear direction X, thereby suppressing side leakage.

In the present embodiment, at least one wide-width vertical groove portion 27a is provided behind the high-basis-weight and high-thickness portion 41 extending in the front-rear direction X.

Compared with the rear core portion 23, the high basis weight and high thickness portion 41 has a higher basis weight and higher rigidity, and More difficult to deform. Regarding the situation that the degree of difficulty in deformation of the high-basis-weight and high-thickness portion 41 is transmitted to the rear of the high-basis-weight and high-thickness portion 41 and affects the flexibility of the rear core portion 23 , a wide width with a lower basis weight can be provided. The vertical groove portion 27a (the wide vertical groove portion 27a in the center) is suppressed.

Furthermore, the number of the wide-width vertical groove portions 27a located behind the high-basis-weight and high-thickness portion 41 is not limited to one, and may be plural. Furthermore, in the present embodiment, an example in which the center in the width direction Y of the high basis weight and 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 is given. Not limited to this form, the center in the width direction Y of the high basis weight and high thickness portion 41 and the center in the width direction Y of the wide vertical groove portion 27a may be staggered, as long as the wide vertical groove portion 27a is located at the high basis weight and high thickness. Part 41 is just behind.

Further, in the present embodiment, in the rear core portion 23, the wide vertical groove portion 27a is located in the central region in the width direction Y, and the narrow vertical groove portion 27b is located in the region on both sides in the width direction Y. As a result, the rigidity in the bending direction of the central region in the width direction Y where the wide vertical groove portion 27a is located is lower than that on both sides in the width direction Y where the narrow vertical groove portion 27b is located.

By arranging longitudinal grooves with different groove widths in this way, the rigidity distribution in the width direction of the rear core portion 23 is adjusted, so that when the wearer wears the sanitary napkin 1, the width of the rear core portion 23 is wider. The central region 65 in the width direction where the widthwise longitudinal groove portion 27a is located tends to take the wide longitudinal groove portion 27a as the starting point of deformation, and the two side regions 66 and 66 where the narrower width longitudinal groove portion 27b is located are more preferentially toward the wearer The skin side protrudes out of shape. Since the widthwise central region 65 of the rear core portion 23 is deformed so as to protrude toward the skin side along the gluteal cleft of the buttocks, the gap between the wearer's gluteal cleft and the absorbent article is reduced. The gap becomes smaller. Furthermore, since the narrow longitudinal groove portions 27b exist in the regions 66 on both sides in the width direction, it is easy to follow the central region 65 which preferentially deforms and deform along the protrusions of the buttocks.

As a result, the gap between the buttocks and the sanitary napkin 1 is reduced, the conformability is improved, and leakage at the rear portion, especially side leakage, is suppressed. In addition, even when the wearer is lying on his back and the buttocks are deformed by the bedding, the rear core portion 23 is easily deformed along the shape of the body, so even if menstrual blood or the like is excreted from the wearer's excretory portion. The liquid flow out to the rear part is quickly absorbed by the absorptive core 20, and the liquid leakage in the rear part is suppressed.

As described above, the absorbent article of the present embodiment is provided with a high basis weight portion having a high basis weight and a low thickness portion and a high basis weight and high thickness portion, thereby reducing the stiffness and providing the wearer with a comfortable feeling of use, and It has sufficient liquid absorption capacity, improves the fit to the excretory part, is not easy to leak sideways in the middle core part, and has excellent absorption performance.

Furthermore, in the absorbent article of the present embodiment, by providing the wide longitudinal groove portion behind the high basis weight and high thickness portion, the flexibility of the rear core portion is suppressed from being affected by the difficulty of deformation of the high basis weight and high thickness portion. In addition, by providing a plurality of longitudinal grooves with different widths in the rear core part, the rear core part has flexibility and is easy to deform along the shape of the body, so that the rear core part conforms to the shape of the body. The performance is improved, and the leakage at the rear part, especially the side leakage, is suppressed.

Moreover, in the absorptive core 20 of the present embodiment, the area where the basis weight is relatively high in the entire absorptive core 20 as in the high basis weight portion 4 provided in the middle core portion 22 is not provided in the rear core. The portion 23 reduces the rigidity of the rear portion of the sanitary napkin 1 and provides the wearer with a comfortable feeling of use, and the conformability is improved as described above, so that the liquid is not easily leaked.

Furthermore, by arranging a plurality of wide longitudinal groove portions 27a in the rear core portion 23 as in the present embodiment, and arranging them equally behind the high basis weight portion 4 of the intermediate core portion 22, the When the widthwise central region 65 protrudes toward the skin side when worn, the high basis weight portion 4 is lifted (lift up), since the adhesion to the excretory part becomes high, it is effective in suppressing side leakage of bodily fluids. Furthermore, if the boundary groove portion 61 exists between the intermediate core portion 22 and the rear core portion 23 as in the present embodiment, and the peripheral groove portion 29 exists so as to surround the high basis weight portion 4, then The high basis weight part 4 is easier to lift as a whole. In particular, in the 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, it is easier to lift.

Moreover, in this embodiment, the wide longitudinal groove part 27a is provided behind the high basis weight low thickness part 42 extended in the front-back direction of the intermediate core part 22. As shown in FIG.

Compared with the rear core portion 23 , the high-basis-weight and low-thickness portion 42 has a higher basis weight, higher rigidity, and less deformation. In view of the situation that the difficulty of deformation of the high basis weight and low thickness portion 42 is transmitted to the rear of the high basis weight and low thickness portion 42 and affects the flexibility of the rear core portion 23, a wide longitudinal groove with a lower basis weight can be provided. portion 27a (left and right wide vertical groove portion 27a) is suppressed.

Therefore, the rear core portion 23 can be provided with flexibility, the conformability at the rear core portion can be improved, and the leakage at the rear portion can be further suppressed.

Moreover, in the absorbent core 20 of the present embodiment, as shown in FIG. 3, the thickness t1 of the bottom of the groove forming the central wide vertical groove portion 27a is larger than the groove forming the left and right wide vertical groove portions 27a. The thickness t2 of the bottom of the groove is thin.

As a result, the rigidity of the bottom of the wide vertical groove portion 27a forming the center is lower than that of the bottom forming the left and right wide vertical groove portions 27a. Therefore, when the sanitary napkin 1 is worn, the absorptive core 20 tends to protrude toward the wearer's skin more preferentially than the left and right wide longitudinal grooves 27a with the central wide longitudinal groove 27a as the starting point of deformation It deforms in such a way that the sanitary napkin 1 is easy to follow the groin portion which is a shape that is sharply concave with respect to the protrusion of the buttocks. Thereby, the compliance is further improved, and the Control leaks at the rear.

Furthermore, in this embodiment, the rigidity of the bottom portion forming the groove portion is changed by changing the thickness of the bottom portion, but the thickness of the bottom portion may be equalized and the central wide longitudinal groove portion 27a may be changed. The width of the groove is wider than that of the left and right wide longitudinal groove portions 27a, and the rigidity of the bottom portion forming the groove portion is changed.

In addition, by providing a vertical groove portion 27c extending in the front-rear direction X at the center of the high-basis-weight and high-thickness portion 41 in the width direction Y and having a lower basis weight than the basic-weight portion 4, the high-basis-weight and high-thickness portion 41 is formed. It is easy to follow the excretory part, and the conformability to the excretion part is further improved, thereby suppressing liquid leakage.

In addition, by providing the boundary groove portion 61 with a lower basis weight at the boundary portion P2 of the intermediate core portion 22 and the rear core body portion 23, the sanitary napkin 1 is easily deformed in the front-rear direction X using the boundary groove portion 61 as the starting point of deformation. By bending up, the sanitary napkin 1 is easily deformed along the shape from the excretion part of the wearer's body to the back side, and the conformability is improved, thereby suppressing liquid leakage.

In addition, by providing the boundary groove portion 61 , the external force acting on the intermediate core portion 22 is reduced to the boundary groove portion 61 , and the deformation of the intermediate core portion 22 is not easily transmitted to the rear core portion 23 . Likewise, the deformation of the rear core portion 23 is not easily transmitted to the intermediate core portion 22 . In this way, the deformation of one of the middle core portion 22 and the rear core portion 23 does not easily affect the other, and the deformation of the absorbent core is suppressed, thereby suppressing liquid leakage.

Moreover, in this embodiment, in addition to the vertical groove portion 27 being arranged over the entire length of the front-rear direction X of the sanitary napkin 1, the horizontal groove portion 28 is also arranged, so that the sanitary napkin 1 can be easily worn along the front-rear direction X in the front-rear direction X. The shape of the wearing object of the wearer is deformed, and the conformability is improved.

Moreover, in this embodiment, by providing the vertical groove part 27, the horizontal groove part 28, the peripheral groove part 29, the boundary groove parts 60 and 61 which are low in basis weight and easily deformed, the absorptive core can be improved. 20 softness, and seek to improve the wearability. In addition, by providing the groove portion, the excreted liquid can be quickly introduced into the space of the groove and taken into the absorptive core 20, so that the liquid absorption speed can be improved. Moreover, by dividing the absorptive core 20 into a plurality of square parts, the surface area of the absorptive core 20 can be increased, and the liquid can be absorbed and held efficiently.

In addition, in the above-mentioned embodiment, since the absorptive core 20 has a constricted portion, and the width of the intermediate core portion 22 serving as the excretion portion opposing portion is narrowed, the absorptive core 20 can be received during wearing. The external force from the wearer's legs on the outer side in the width direction is reduced toward the inner side in the width direction, so that the deformation of the intermediate core portion 22 can be suppressed. Thereby, the sanitary napkin 1 can be easily adhered to the wearer's body, and the deviation from the skin can be suppressed.

[Additional explanation of this embodiment]

Hereinafter, the present embodiment will be explained supplementally.

Numerical examples of each configuration will be described, but these numerical values are only 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 high thickness portion 41 , the width of the high basis weight low thickness portion 42 , and the width of the low basis weight portion 25 , the width of the high basis weight portion 4 is in the front-rear direction. In the case of non-uniformity in X, it is the width at the position where the imaginary line is drawn along the width direction of the part with the largest width of the high basis weight part 4 .

The width of the high basis weight portion 4 disposed 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 more preferably 60 mm or less, more preferably 50 mm or less. By making this width into such a range, a sufficient absorption amount can be ensured.

The high-basis-weight portion 4 has a high-basis-weight and low-thickness portion 42 obtained by locally reducing the thickness by compressing both sides thereof. By reducing the thickness in this way, it is possible to reduce the rigidity when wearing.

As shown in FIG. 2, the width a of the high basis weight and high thickness portion 41 is preferably 10 mm or more, more preferably 15 mm or more, and is preferably 40 mm or less, more preferably 30 mm or less. By setting the width of the high-basis-weight and high-thickness portion 41 serving as the protruding portion of the absorptive core 22 to such a range, the fit to the excretory portion of the wearer can be improved.

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 from the viewpoint of spreading the absorbed liquid in the front-rear direction while suppressing the generation of friction. Moreover, from the same viewpoint, the width b of the high basis weight low thickness portion 42 is preferably 2 mm or more, more preferably 3 mm or more, and is 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 is preferably 30 mm or less, more preferably 20 mm or less.

From the viewpoint of sufficiently securing the liquid absorption capacity, the basis weight of the high basis weight portion 4 is preferably 250 g/m ² or more, more preferably 300 g/m ² or more, and more preferably 700 g/m ² or less. Preferably, it is 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 more preferably 350 g from the viewpoint of appropriately reducing the rigidity while making the liquid absorbency appropriate. /m ² or less, more preferably 300 g/m ² or less.

The thickness of the high basis weight and high thickness portion 41 is preferably 2 mm or more, more preferably 2.5 mm or more, and And, it is preferably 9 mm or less, more preferably 8 mm or less.

From the viewpoint of reducing the rigidity, the thickness of the high basis weight and low thickness portion 42 and the low basis weight portion 25 is preferably 1.5 mm or more, more preferably 2 mm or more, and is preferably 6 mm or less, more preferably 5.5 mm. the following.

The difference between the thickness of the high-basis-weight high-thickness portion 41 and the thickness of the high-basis-weight low-thickness portion 42 is preferably 0.5 mm or more from the viewpoint of the conformability of the high-basis weight high-thickness portion 41 to the excretory portion, More preferably, it is 1 mm or more, more preferably 5 mm or less, and more preferably 4 mm or less.

The widths of the peripheral groove portion 29 , the vertical groove portion 27 and the lateral groove portion 28 are preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 10 mm or less, more preferably 5 mm or less.

Arranged in the Y-axis direction at the boundary between the intermediate core portion 22 and the rear core portion 23 (front core portion 21 ), in other words, between the high basis weight portion 4 and the rear core portion 23 (front core portion 21 ) The width of the boundary grooves 61 ( 60 ) arranged in an extended manner is preferably 1.5 mm or more, more preferably 2 mm or more, and is preferably 3.5 mm or less, more preferably 3 mm or less.

In addition, the width of the wide vertical groove portion 27a is preferably 1 mm or more, and 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 further, the rigidity of the central region in the width direction of the rear core portion 23 is made higher than the width direction side. From the viewpoint of moderately reducing the square area, it is preferably 2 times or more.

The basis weight of the peripheral groove portion 29 , the vertical groove portion 27 , and the lateral groove portion 28 is lower than the basis weight of the square portion, for example, 25 g/m ² or more. Furthermore, it is 300 g/m ² or less.

As shown in FIG. 3 , the bottom thickness t1 of the wide vertical groove portion 27 a arranged in the center of the three wide vertical groove portions 27 a arranged in the widthwise central region 65 of the rear core portion 23 is larger than that of the other two The bottom thickness t2 of the wide vertical groove portion 27a is thin. The bottom thickness t1 of the wide vertical groove portion 27a arranged in the center is 0.25 mm or more, more preferably 0.5 mm or more, and 5 mm or less, and more preferably 4 mm or less.

(Method for measuring the width of each part of the absorbent core)

Regarding the width of 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 side outer portion, the absorbent core can be placed horizontally, and a microscope (VHX-1000 manufactured by KEYENCE Corporation) can be used. The width was measured by adjusting the measurement magnification to enlarge the skin-facing surface 20a.

(Method for measuring the basis weight of each part of the absorbent core)

Each part of the absorbent core 20 to be measured was cut using a single-edged razor manufactured by Feather, and small pieces were obtained so as to have a predetermined area. The weight of these small pieces was measured using an electronic balance (electronic balance GR-300 manufactured by A & D Company, 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 each small piece. For each of the parts, the average of the basis weights of 5 small pieces was set as the basis weight.

(Measurement method of thickness of each part of absorbent core)

The measurement of the thickness of the absorptive core which is a measurement object is performed by measuring the thickness of the small piece cut out in order to measure a basis weight with respect to each site|part. The small pieces cut out from the absorbent core were pressed at a pressure of 5 kPa for 10 minutes, and the measurement was performed immediately after weight removal. In the central area of the deweighted sample, place a circular aluminum plate with a diameter of 25mm, a thickness of 3mm, and a mass of 2.45g horizontally and slowly, using a non-contact laser displacement meter (laser head LK-G30 manufactured by KEYENCE) , displacement meter LK-GD500) to measure the thickness of the sample. The size of the cut pieces is smaller, When it is difficult to measure with a non-contact laser displacement meter, for example, a microscope (VHX-1000 manufactured by KEYENCE Corporation) can be used to observe the cross section of the cut sample at a magnification of 20 to 100 times.

As mentioned above, although embodiment of this invention was described, this invention is not limited only to the said embodiment, Of course various changes can be added in the range which does not deviate from the summary of this invention.

For example, in the said embodiment, although the example of the menstrual napkin was shown as an absorbent article, it is not limited to this. The absorbent article of the present invention can also be, for example, an incontinence pad or a vaginal secretion pad.

Moreover, in the above-mentioned embodiment, the example in which the three wide longitudinal groove portions 27a are provided in the rear core portion 23 is given, but it is also possible to have a higher basis weight as in the absorptive core 70 shown in FIG. 5 . One wide vertical groove portion 27a is provided behind the thickness portion 41, and the other vertical groove portions are defined as narrow vertical groove portions 27b.

Moreover, in the said embodiment, although the absorptive core 20 has the shape which has a shrinkage|contraction, like the absorptive core 71 shown in FIG.

In FIG. 5 and FIG. 6, the same code|symbol is attached|subjected to the same structure as the said embodiment, and description is abbreviate|omitted. By providing at least one wide-width vertical groove portion 27a behind the high-basis-weight and high-thickness portion 41 in the rear core portion 23 in this manner, and further providing the narrow-width vertical groove portion 27b, the above-mentioned effects, Effect.

Moreover, in the said embodiment, although the high basis weight part 4 protrudes toward the thickness direction Z upper side, you may replace it with the form which protrudes toward the thickness direction Z lower side as shown in FIG. Furthermore, in the above-mentioned In the embodiment, various groove parts such as the vertical groove part 27 , the lateral groove part 28 , the peripheral groove part 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, but Instead of this, it is also possible to have an opening on the lower side in the thickness direction Z as shown in FIG. 7 .

With regard to the above-described embodiments of the present invention, the following additional notes are further disclosed.

(1)

An absorbent article comprising an absorptive core having a front core portion and a rear core portion located at both end sides in the front-rear direction, and the front core portion and the rear core located at the front and rear an intermediate core part between the body parts, and the intermediate core part has: a high basis weight part located in a central area in the width direction, and the basis weight is higher than the front core part and the rear core part; and a low basis weight The heavy part is located in the area on both sides in the width direction, and has a lower basis weight than the above-mentioned high basis weight part; the above-mentioned high basis weight part has: a high basis weight and high thickness part, which is located in the central part in the width direction; and a high basis weight The low-thickness part is located on both sides in the width direction of the high-basis weight and high-thickness part, and the thickness is thinner than the high-basis-weight and high-thickness part; A wide-width vertical groove portion behind the thickness portion, and a narrow-width vertical groove portion narrower than the above-mentioned wide-width vertical groove portion.

(2)

The absorbent article according to (1), wherein the rear core portion further has a wide longitudinal direction extending in the front-rear direction behind the high basis weight and low thickness portion wider than the narrow longitudinal groove portion. groove part.

(3)

The absorbent article according to (2), wherein the narrow vertical groove portion is formed by interposing the wide vertical groove portion located behind the high basis weight and high thickness portion and the high basis weight and low thickness portion. on both sides in the width direction.

(4)

The absorbent article according to (2) or (3), wherein the thickness of the bottom of the wide-width longitudinal groove portion located behind the high-basis-weight and high-thickness portion is larger than the thickness of the bottom of the high-basis-weight and low-thickness portion located behind the high-basis-weight and low-thickness portion. The thickness of the bottom of the above-mentioned wide longitudinal groove portion of the square is thin.

(5)

The absorbent article according to any one of (1) to (4), wherein the intermediate core portion further has a longitudinal groove portion connected to the center in the width direction of the high basis weight and high thickness portion It extends in the front-rear direction and has a lower basis weight than the above-mentioned high basis weight portion.

(6)

The absorbent article according to any one of (1) to (5), wherein the absorptive core has a lower basis weight than the above in the width direction at the boundary between the intermediate core portion and the rear core portion The boundary groove portion where the basis weight portion is low.

(7)

The absorbent article according to (6), wherein the rear end portion of the high basis weight portion is adjacent to the boundary groove portion.

(8)

The absorbent article according to any one of (1) to (6), wherein the absorptive core has a lower basis weight in the width direction than the above at the boundary between the front core portion and the intermediate core portion. The boundary groove portion where the basis weight portion is low.

(9)

The absorbent article according to (8), wherein the front end portion of the high basis weight portion is adjacent to the boundary groove portion.

(10)

The absorbent article according to any one of (1) to (7), wherein the intermediate core portion has the high basis weight portion and the low basis weight portion formed along at least an outer edge in the front-rear direction of the high basis weight portion. The peripheral groove portion between the heavy parts.

(11)

The absorbent article according to (10), wherein the peripheral groove portion is provided along a side edge of the high basis weight and low thickness portion, and the basis weight is lower than the groove of the low basis weight portion.

(12)

The absorbent article according to (10) or (11), wherein the absorbent core has a relatively high basis weight along the width direction at the boundary between the intermediate core portion and the rear core portion or the front core portion. The low basis weight portion is a low boundary groove portion, and the peripheral groove portion communicates with the boundary groove portion.

(13)

The absorbent article according to any one of (1) to (12), wherein the width of the high basis weight portion arranged in the central region in the width direction of the intermediate core portion is preferably 15 mm or more, more preferably 20 mm As mentioned above, it is preferable that it is 60 mm or less, and it is more preferable that it is 50 mm or less.

(14)

The absorbent article according to any one of (1) to (13), wherein the width of the high basis weight and high thickness portion is preferably 10 mm or more, more preferably 15 mm or more, and more preferably 40 mm or less, more preferably Preferably it is 30mm or less.

(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 absorbent article according to any one of (1) to (15), wherein the width of the high basis weight and low thickness portion is preferably 2 mm or more, more preferably 3 mm or more, and more preferably 10 mm or less, more preferably Preferably it is 7.5mm or less.

(17)

The absorbent article according to any one of (1) to (16), wherein the width of the low basis weight portion is preferably 5 mm or more, more preferably 7.5 mm or more, and more preferably 30 mm or less, more preferably 20mm or less.

(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)

The absorbent article according to any one of (1) to (18), wherein the width of the wide vertical groove portion is 1.5 times or more the groove width of the narrow vertical groove portion, preferably 2 times or more.

(20)

The absorbent article according to any one of (1) to (19), wherein the width of the middle core portion is smaller than both the width of the front core portion and the width of the rear core portion.

(twenty one)

The absorbent article according to any one of (1) to (20), wherein the front core portion has a wide longitudinal groove portion extending in the front-rear direction and located in front of the high basis weight and high thickness portion , and a narrow-width vertical groove portion narrower than the above-mentioned wide-width vertical groove portion.

(twenty two)

The absorbent article according to any one of (1) to (21), wherein the high basis weight portion is the A shape in which the width of the rear end portion in the front-rear direction is narrower than the central portion in the front-rear direction.

(twenty three)

The absorbent article according to any one of (1) to (22), wherein the absorbent article is a menstrual sanitary napkin.

[Industrial Availability]

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

4: High basis weight

20: Absorbent core

20a: Skin Opposite Side

21: Front core part

21a: inclined part

22: Intermediate core body

23: Rear core part

23a: Inclined part

25: Low Basis Weight

27: Longitudinal groove part

27a: Wide longitudinal groove part

27b: Narrow longitudinal groove part

27c: Longitudinal groove part

28: Horizontal groove part

29: Circumferential groove part

41: High basis weight and high thickness part

42: High basis weight and low thickness part

45: Front end

46: rear end

60: Junction groove part

61: Junction groove part

291: Straight line

292: Bending part

D1: width

D2: width

D3: width

L1: imaginary line segment

L2: imaginary line segment

P1: Junction

P2: Junction

R1: Region

R2: Region

X: Front and rear direction

Y: width direction

Z: vertical direction (thickness direction)

Claims (22)

An absorbent article comprising an absorbent core having a front core portion and a rear core portion located on both end sides in the front-rear direction, and the front core portion and the rear core located on the front side an intermediate core part between the body parts, and the intermediate core part has: a high basis weight part located in a central area in the width direction, and the basis weight is higher than the front core part and the rear core part; and a low basis weight The heavy part is located in the area on both sides in the width direction, and has a lower basis weight than the high basis weight part; the high basis weight part has: a high basis weight and high thickness part, which is located in the central part in the width direction; and a high basis weight The low-thickness part is located on both sides in the width direction of the high-basis weight and high-thickness part, and the thickness is thinner than that of the high-basis-weight and high-thickness part; A wide longitudinal groove portion behind the thickness portion, and a narrow longitudinal groove portion narrower than the wide longitudinal groove portion, the rear core portion is connected behind the high basis weight and low thickness portion and further has A wide-width vertical groove portion extending along the front-rear direction and wider than the narrow-width vertical groove portion. The absorbent article according to claim 1, wherein the narrow vertical groove portion is located in the width across the wide vertical groove portion located behind the high basis weight high thickness portion and the high basis weight low thickness portion. direction on both sides. The absorbent article of claim 1 or 2, wherein the thickness of the bottom of the wide-width longitudinal groove portion formed behind the high-basis-weight and high-thickness portion is thicker than that of the bottom portion of the high-basis-weight and low-thickness portion formed. The thickness of the bottom of the above-mentioned wide longitudinal groove portion at the rear is thin. The absorbent article according to claim 1 or 2, wherein the intermediate core portion further has a longitudinal groove portion extending in the front-rear direction at the center in the width direction of the high-basis-weight and high-thickness portion and having a relatively high basis weight. The above-mentioned high basis weight portion is low. The absorbent article according to claim 1 or 2, wherein the absorbent core has a boundary groove along the width direction with a lower basis weight than the low basis weight portion at the boundary between the middle core portion and the rear core portion. department. The absorbent article of claim 5, wherein the rear end portion of the high basis weight portion is adjacent to the boundary groove portion. The absorbent article according to claim 1 or 2, wherein the absorbent core has a boundary groove along the width direction at the boundary between the front core part and the middle core part, the basis weight of which is lower than that of the low basis weight part department. The absorbent article according to claim 7, wherein the front end portion of the high basis weight portion is adjacent to the boundary groove portion. The absorbent article of claim 1 or 2, wherein the intermediate core portion has a peripheral groove formed between the high basis weight portion and the low basis weight portion along at least an outer edge in the front-rear direction of the high basis weight portion department. The absorbent article according to claim 9, wherein the peripheral groove portion is a groove provided along a side edge of the high basis weight and low thickness portion and having a lower basis weight than the low basis weight portion. The absorbent article according to claim 9, wherein the absorbent core has a lower basis weight in the width direction than the low basis weight portion at the boundary between the intermediate core portion and the rear core portion or the front core portion. The boundary groove portion, and the peripheral groove portion communicates with the boundary groove portion. The absorbent article according to claim 1 or 2, wherein the width of the high basis weight portion disposed in the central region in the width direction of the intermediate core portion is preferably 15 mm or more, more preferably 20 mm or more, and more preferably 60 mm Below, it is more preferable that it is 50 mm or less. The absorbent article according to claim 1 or 2, wherein the width of the high basis weight and 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. The absorbent article of claim 1 or 2, 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. The absorbent article according to claim 1 or 2, wherein the width of the high basis weight and 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. The absorbent article according to claim 1 or 2, wherein the width of the low basis weight portion is preferably 5 mm or more, more preferably 7.5 mm or more, and is preferably 30 mm or less, more preferably 20 mm or less. The absorbent article according to claim 1 or 2, wherein the width of the wide longitudinal groove portion is preferably 1 mm or more, more preferably 2 mm or more. The absorbent article according to claim 1 or 2, wherein the width of the wide vertical groove portion is 1.5 times or more, preferably 2 times or more, of the groove width of the narrow vertical groove portion. The absorbent article of claim 1 or 2, wherein the width of the middle core portion is smaller than both the width of the front core portion and the width of the rear core portion. The absorbent article according to claim 1 or 2, wherein the front core portion has a wide longitudinal groove portion extending in the front-rear direction and located in front of the high basis weight and high thickness portion, and has a wider width than the above-mentioned wider width. A narrow vertical groove portion with a narrow vertical groove portion. The absorbent article according to claim 1 or 2, wherein the high basis weight portion is a shape in which the width of the rear end portion in the front-rear direction is narrower than the central portion in the front-rear direction. The absorbent article of claim 1 or 2, wherein the above-mentioned absorbent article is a menstrual sanitary napkin.

Images