TW202023506A - Absorbent article - Google Patents

Abstract

An absorbent article according to one embodiment of the present invention is equipped with an absorbent core having: a front core part and a rear core part located in both end parts in the front-rear direction; and an intermediate core part located between the front core part and the rear core part. The intermediate core has: a high-basis-weight part located in a central area in the width direction and having a higher basis weight than the front core part and the rear core part; and low-basis-weight parts located in areas on both sides in the width direction and having a lower basis weight than the high-basis-weight part. The high-basis-weight part has: a high-basis-weight high-thickness part located in a central part in the width direction; and high-basis-weight low-thickness parts located in areas on both sides in the width direction of the high-basis-weight high-thickness part and having a thinner thickness than the high-basis-weight high-thickness part. The rear core part has: a wide longitudinal groove extending in the front-rear direction and located on the rear side of the high-basis-weight high-thickness part; and a narrow longitudinal groove narrower than the wide longitudinal groove.

Description

Absorbent articles

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

The type of absorbent article used on the inner side of underpants like menstrual sanitary napkins has an absorbent core for absorbing liquid substances such as menstrual blood. For example, in the absorbent core described in Patent Document 1, a protruding portion having a shape that is longer in the longitudinal direction of the absorbent core is provided in a portion of the opposite portion from the excretion portion to the rear portion. The way of wearing the skin of the author is provided with grooves. [Prior Technical 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 square core portion and a rear core portion located on both end sides in the front-rear direction, and the front core portion and the back The middle core part between the core parts. The intermediate core portion has: a high basis weight portion located in a central region in the width direction and a basis weight higher than the front core portion and the rear core portion; and a low basis weight portion located on both sides in the width direction , And has a lower basis weight than the above-mentioned high basis weight part. The high basis weight portion has: a high basis weight and high thickness portion located at the center in the width direction; and a high basis weight and low thickness portion located on both sides in the width direction of the high basis weight portion and high thickness portion, and the thickness is higher than the above The base weight is high and the thickness is thin. The rear core portion has a wide longitudinal groove portion extending in the front-rear direction and located behind the high basis weight and high thickness portion, and a narrow longitudinal groove portion narrower than the wide longitudinal groove portion .

Absorbent articles such as menstrual sanitary napkins are worn on the back corresponding to the wearer's buttocks. For example, when the wearer is lying on his back when he is going to bed, the shape of his buttocks is deformed by crushing the bedding compared to when he is standing, and the shape of the buttocks is deformed from the opposite part of the excretory part of the absorbent article to the rear The part is prone to gaps between the skin and the absorbent article, which may cause liquid leakage.

The present invention relates to an absorbent article that can inhibit liquid leakage.

[The overall composition of sanitary napkins] Hereinafter, in each figure, the X axis direction corresponds to the front and back 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 this embodiment is configured as a menstrual sanitary napkin, and is referred to as a sanitary napkin 1 hereinafter. The sanitary napkin 1 of this embodiment can also be used at bedtime, for example, it can also have a length of 30 cm or more along the front-back direction X.

As shown in Fig. 1, the sanitary napkin 1 includes a main body M, a pair of wings W, and a pair of rear wings F in this embodiment. The main body M extends in the front-rear direction X, and is fixed to the inner surface (worn surface) of the wearer's underwear during wearing. The main body M has an absorbent body 11, which has the function of absorbing liquid substances such as menstrual blood of the wearer (hereinafter, also referred to as "liquid"). The main body M has a front area M1, a middle area M2, and a rear area M3 along the front-rear direction X. The front area M1 is arranged in the area in front of the middle area M2 (the wearer's abdominal side), and is configured to face the front of the wearer's excretion during wearing. The middle area M2 is configured to face the excretory part of the wearer during wearing. Furthermore, the middle area M2 may be located in front of the main body M as shown in the figure, or may be located in the center of the main body M. The back area M3 is an area located behind the middle area M2 (the wearer's back), and is configured to face the wearer's excretion when worn.

The wing part W is comprised so that it may protrude largely toward the outer side of the width direction from the intermediate region M2. The rear wing portion F is configured to bulge outward in the width direction from the rear area M3. Furthermore, the sanitary napkin 1 may not have at least one of the wings W and the rear wings F.

[The composition of sanitary napkins] As shown in FIGS. 1 to 3, the sanitary napkin 1 includes an absorber 11, a front sheet 12, a back sheet 13, a pair of side sheets 14 and a compressed groove part 16. In the main body M, the sanitary napkin 1 has a structure in which a back sheet 13, an absorber 11, and a front sheet 12 are laminated. The sanitary napkin 1 is constructed in such a way that the front sheet 12 is in contact with the wearer's skin when worn.

The absorber 11 has a front-rear direction in the X-axis direction, and is arranged at the center of the sanitary napkin 1 in the thickness direction. The absorber 11 absorbs liquid from the surface on the side of the front sheet 12, diffuses the liquid inside, and retains the liquid. The absorber 11 will be described below. The surface sheet 12 is configured as a liquid-permeable sheet and is arranged on the absorber 11. The front sheet 12 constitutes the upper outer surface of the sanitary napkin 1 in the thickness direction in the main body M. The back sheet 13 is arranged so as to face each other in the thickness direction with the absorber 11 and the front sheet 12 interposed therebetween. The back sheet 13 constitutes the outer surface of the sanitary napkin 1 downward in the thickness direction. The back sheet 13 is joined to the front sheet 12 and the side sheet 14 by, for example, an adhesive, heat sealing, etc. at the peripheral edge. The pair of side sheets 14 oppose each other in the width direction with the front sheet 12 interposed therebetween, and are arranged on the widthwise peripheral edge of the sanitary napkin 1. The pair of compressed groove portions 16 are configured as linear grooves formed by compressing the absorber 11 and the surface sheet 12.

(Basic composition of absorber) As shown in FIGS. 2 and 3, the absorber 11 has an absorbent core 20 and a core covering material 30. The absorbent core 20 has the function of absorbing and retaining liquid. The absorbent core 20 may be formed of, for example, a fiber assembly containing hydrophilic fibers such as pulp fibers, or may have a configuration in which the fiber assembly holds a water-absorbing polymer. Hereinafter, the member constituting the absorbent core 20 is referred to as an absorbent member. As shown in FIGS. 2 and 3, the core covering material 30 is wound in the width direction of the absorbent core 20 so as to cover the front and back surfaces of the absorbent core 20. The length of the core covering material 30 along the X-axis direction is formed to be the same as the length (full length) of the absorbent core 20 in the front and rear direction X, but it is not limited to this, and may be longer than the full length of the absorbent core 20 , Can be shorter. The core covering material 30 covers the absorbent core 20, and has a function of maintaining the shape of the absorbent core 20, for example. The core covering material is formed of, for example, a thin and soft paper such as toilet paper or a liquid-permeable non-woven fabric. The core-coating material 30 may be composed of one sheet, or may be composed of a plurality of sheets. The chip covering material 30 may be joined to the front sheet 12 and the back sheet 13 by, for example, an adhesive applied in a specific pattern.

(Constitution of absorbent core) As shown in FIG. 4, the absorbent core 20 has a front core part 21, which is located in the front area M1, a middle core part 22, which is located in the middle area M2, and a rear core part 23, which is located in the rear area M3. The front core portion 21 and the rear core portion 23 are located at both end sides in the front and rear direction X of the absorbent core 20, and the middle core portion 22 is located between the front core portion 21 and the rear core portion 23. The middle core portion 22 reaches the front side of the rear region M3 from the rear side of the front region M1 via the middle region M2. The absorbent core 20 has a planar shape that is symmetrical in the width direction.

In FIG. 4, the width|variety D1, D2, D3 which are the width direction dimensions of the front core part 21, the middle core part 22, and the rear core part 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 indentation in the middle part of the front-rear direction X. The front core portion 21 has an inclined portion 21a at the rear end, and the rear core portion 23 has an inclined portion 23a at the front end. The inclined portions 21 a and 23 a increase the width of the middle core portion 22 toward the front core portion 21 and the rear core portion 23. In addition, in the present embodiment, the absorbent core 20 having a retracted shape is taken as an example for description, but it may be an absorbent core having a uniform width in the front-rear direction X.

The middle core part 22 is an excretory part opposite to the wearer's excretory part, that is, the vaginal opening when the sanitary napkin 1 is worn. The front core portion 21 is arranged on the front side (ventral side) of the wearer than the middle core portion 22, and the rear core portion 23 is arranged on the back side (back side) of the wearer than the middle core portion 22.

Plural grooves are provided on the skin facing surface 20a side of the absorbent core 20. Specifically, the front core portion 21, the middle core portion 22, and the rear core portion 23 are provided with a vertical groove portion 27 and a horizontal groove portion 28, and the middle core portion 22 is provided with a peripheral groove portion 29. Furthermore, a boundary groove portion 60 is provided at the boundary portion P1 between the front core portion 21 and the middle core portion 22, and a boundary groove portion 60 is provided on the boundary portion P2 between the middle core portion 22 and the rear core portion 23.槽部61。 Slot 61. The boundary portion P1 and the boundary portion P2 are positioned so as to cross the absorbent core 20 in the width direction, respectively. Furthermore, the so-called boundary portion P1 refers to the part between the front core portion 21 and the middle core portion 22 that does not belong to any one, and the so-called boundary portion P2 refers to the portion between the rear core portion 23 and the middle core portion 22 It is not part of either. However, since the boundary groove part is not necessary in the present invention, there is no boundary part as a "part that does not belong to any one" in an absorbent core without the boundary groove part.

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, and the boundary groove portions 60 and 61 of the low basis weight of the absorbent member having a relatively low basis weight. Divide into plural. The grooves are configured to sink downward from the upper surface (the surface on the wearer's skin side) in the thickness direction relative to the block divided into blocks. On the other hand, the block portion is configured to protrude upward in the thickness direction.

In the absorbent core 20, the thickness of the area where the groove is formed, that is, the bottom of the groove, is relatively thinner than the area where the square is not formed. Compared with the square part, the basis weight of the bottom of the groove part is relatively low, and the rigidity of the bottom part of the groove becomes lower than that of the square part. 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 starting point of deformation. In the following description, the basis weights of the front core portion 21, the middle core portion 22, and the rear core portion 23 refer to the basis weights of the square portions excluding the groove portions 27, 28, 29, 60, 61.

The longitudinal groove portions 27 extend along the front-rear direction X, and are arranged in plural at intervals along 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 middle 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 each of the front core portion 21, the middle core portion 22, and the rear core portion 23 in the front-rear direction X. Furthermore, in this embodiment, the boundary groove portions 60 and 61 formed in the boundary portions P1 and P2 are not included in the horizontal groove portion 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 horizontal groove portion 28. The peripheral groove portion 29 is formed along the front and rear direction X outer edges of the high basis weight portion 4 described below. In addition, the shape or arrangement of the longitudinal groove portion 27, the lateral groove portion 28, and the peripheral groove portion 29 are not limited to the structure described in FIG. 4, and may be based on the shape of the absorbent core 20 or required Set the function appropriately.

(The composition of the middle core) As shown in FIGS. 2 and 4, the middle core portion 22 has a high basis weight portion 4 with a relatively high basis weight of the absorbent member, and a low basis weight portion 25 with a relatively high basis weight portion 4 and a low basis weight. 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 base weight portion 4 is located in the widthwise central region 65 of the middle core portion 22 and is extended in the front-rear direction X. 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 middle core portion 22. The pair of low basis weight portions 25 extend in the front-rear direction X, and the high basis weight portions 4 are interposed therebetween to face each other in the width direction. The widthwise side regions 66 and 66 are located on the widthwise outer side than the widthwise central region 65. The high base weight part 4 is arranged in such a way that it faces the excretory part of the wearer when the sanitary napkin 1 is worn.

Furthermore, the high basis weight part 4 has a high basis weight and high thickness part 41 and a high basis weight and low thickness part 42. The high basis weight and high thickness portion 41 is located at the center portion in the width direction Y. 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 a pair of the high basis weight and high thickness portions 41 are interposed therebetween and opposed along the width direction Y. 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 and low thickness portion 42 is made higher and the basis weight and high thickness portion 41 is more densely represented. In the intermediate 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 peripheral groove portion 29 are arranged symmetrically with the longitudinal groove portion 27c located in the center in the width direction Y as the axis of symmetry. Low basis weight 25.

As shown in FIG. 2, the high basis weight and high thickness portion 41 of the high basis weight portion 4 is formed thicker with the lower basis weight portion 25 and the high basis weight and low thickness portion 42 and faces upward in the thickness direction (the front sheet 12 side )prominent. Thereby, it is possible to ensure good conformability between the central part of the middle area M2 of the sanitary napkin 1 corresponding to the high basis weight and high thickness part 41 and the excretory part of the wearer. 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 weight of the high basis weight and high thickness portion 41 and the high basis weight and low thickness portion 42 need not be exactly the same. 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 the value is preferably within 20%, more preferably within 10%. The density of the absorbent member of the high basis weight and low thickness portion 42 is relatively high, and the high basis weight and thickness portion 41 is high and has a high density. The high basis weight and low thickness portion 42 has a higher basis weight and the high thickness portion 41 is thinner, which is equivalent to the low basis weight portion 25. The high basis weight and low thickness portion 42 is located outside the width direction of the high basis weight and high thickness portion 41 and 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 is the second highest, and the low basis weight portion 25 is the lowest. The high basis weight and high thickness portion 41 and the high basis weight and low thickness portion 42 are provided to extend over the entire length in the front and rear direction X of the intermediate core portion 22.

The method of providing the high-density, high-basis-weight and low-thickness portion 42 on the high-basis-weight portion 4 is not particularly limited. For example, after forming a high basis weight portion with a uniform thickness, the high basis weight portion is locally pressed and compressed, thereby forming a high basis weight with a high basis weight, high thickness portion 41 and a high basis weight, low thickness portion 42 Section 4. In this case, the compressed area becomes the high basis weight and low thickness portion 42, and the area 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 group is 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 and low thickness portion 42.

In the middle 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 longitudinal groove portion 27 provided in other core portions, the longitudinal groove portion located in the intermediate core portion 22 is referred to as the longitudinal groove portion 27c for description, and it is not necessary to distinguish it. When, it is simply referred to as the longitudinal 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 of the high basis 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 and low thickness portion 42. The basis weight of the peripheral groove portion 29 is lower than the low basis weight portion 25. The peripheral groove portion 29 is provided throughout the front-rear direction X, and has a straight portion 291 extending along the front-rear direction X and a curved portion 292 connected to the straight portion 291 and bent. The curved portion 292 has the front end 45 and the rear end 46 of the high basis weight portion 4 in a substantially semicircular shape. Furthermore, it is not limited to a semicircular shape, but a triangular shape, a trapezoidal shape, or a combined shape of a circular arc and a straight line, etc., can be used to disperse the forces acting in and out of the plane. The peripheral groove portion 29 and the boundary groove portion provided at the boundary portion P2 (P1) between the middle core portion 22 and the rear core portion 23 (the front core portion 21 and the middle core portion 22) and extending in the width direction 61(60) is connected. The rear end 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 longitudinal groove portion 27c is located at the center of the middle core portion 22 in the width direction Y and is the center of the high basis weight and thickness portion 41 in the width direction Y, and is located in the width direction of each of the front core portion 21 and the rear core portion 23 The longitudinal 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 middle core portion 22 are arranged at equal intervals and parallel to each other so as to cross the middle core portion 22 along the width direction Y. The lateral groove portion 28 is arranged so as to be orthogonal to the straight portion 291 of the peripheral groove portion 29.

(The composition of the 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 of two types of width dimensions. In the rear core portion 23, the longitudinal groove portion 27 with a relatively wide width is referred to as a wide longitudinal groove portion 27a, and the narrow longitudinal groove portion with a narrow width is referred to as a narrow longitudinal groove portion 27b. In addition, 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 at equal intervals in the rear core portion 23. Five longitudinal groove portions 27 are arranged at the rear core portion 23 at equal intervals. The five longitudinal groove portions 27 of the rear core portion 23 are formed over the entire length in the front-rear direction X. Among the five vertical grooves 27, the three vertical grooves 27 located at the center in the width direction Y are set as the wider wide vertical grooves 27a, and the vertical grooves located on the left and right sides of the width direction Y The groove portion 27 is 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 arrangement pitch refers to the distance between the centers of adjacent longitudinal groove portions.

One of the three wide longitudinal groove portions 27a located at the center in the width direction Y (hereinafter referred to as the central wide longitudinal groove portion 27a) is located in the width direction of the middle core portion 22 The center of Y is located behind the high basis weight and high thickness portion 41. Here, the back of the high basis weight and high thickness portion 41 refers to the side edges of the widest width defined by the high basis weight and high thickness portion 41 drawn as shown in FIG. 4 and extending along the front-rear direction In the case of a pair of imaginary line segments L1 and L1, the area R1 of the rear core portion 23 sandwiched by the pair of imaginary line segments L1 and L1. To be located behind the high basis weight and high thickness portion 41, it is sufficient that at least a part of the central wide longitudinal groove portion 27a is located in the region R1. That is, of course, the wide vertical groove 27a including the center is completely in the region R1, and also includes a part of the wide vertical groove 27a located in the region R1, and the other part is located outside the width direction Y of the region R1. form.

Among the three wide longitudinal groove portions 27a, the wide longitudinal groove portions 27a (hereinafter referred to as the left and right wide longitudinal groove portions 27a) located on the left and right sides in the width direction Y are respectively located behind the high basis weight and low thickness portion 42 square. Here, the back of the high basis weight and low thickness portion 42 means that the two side edges of the high basis weight and low thickness portion 42 located at the outermost side in the width direction Y are drawn as shown in FIG. When a pair of imaginary line segments L2 and L2 are extended, the area R2 of the rear core portion 23 sandwiched by the imaginary line segments L1 and L2. The so-called being located behind the high basis weight and low thickness portion 42, 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, of course, a form in which each of the left and right wide vertical groove portions 27a is completely located in the region R2 is also included in each of the left and right wide vertical groove portions 27a, a part of which is located in the region R2, and the other portions are located in the region R2 The shape on the outside in the width direction.

Furthermore, in the absorbent core 20, the inner side in the width direction Y from the imaginary line segment L2 is the central area 65, and the outer side is the side area 66. Regarding the "part with the largest length in the width direction of the high basis weight portion 4", considering the conformability to the wearer's groin portion, it is preferably present in the center portion of the middle core portion 22 in the longitudinal direction.

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, it can be said that the groove depth of the central wide longitudinal groove portion 27a is greater than that of the left and right wide longitudinal groove portions 27a. Deep groove depth.

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

[Function and effect of this embodiment] In the middle core part 22 of the absorbent core 20 of this embodiment, the high basis weight part 4 is provided in the center of the width direction Y, and the low basis weight part 25 is provided on both sides. Compared with the high basis weight part 4, the low basis weight part 25 has a lower basis weight and lower rigidity. When the middle core portion 22 of the absorbent core 20 receives an external force from the legs of the wearer on the outer side in the width direction toward the inner side in the width direction Y during wearing, the low basis weight portion 25 first deforms and acts on the absorbent core 20 external forces are absorbed or relaxed. Therefore, the external force transmitted to the high basis weight portion 4 is reduced, and the deformation of the high basis weight portion 4 caused by the external force is suppressed, thereby suppressing the liquid leakage caused by the deformation of the high basis weight portion 4. In addition, since the high basis weight portion 4 has a higher basis weight than the low basis weight portion 25, the absorbent member has a sufficient absorption capacity, and therefore, it is possible to prevent the liquid from reaching the side edges of the absorbent core 20 and prevent side leakage.

In addition, the high basis weight portion 4 has a high basis weight and low thickness portion 42 obtained by compressing both sides in the width direction Y to reduce the thickness. By reducing the thickness in this way, the hard feeling during wearing can be reduced, and the wearer can feel comfortable in use. The high basis weight and high thickness portion 41 is formed to protrude toward the skin direction 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 part 41 and the excretion part can be ensured.

In addition, although the high-basis-weight and low-thickness portion 42 has a thinner thickness than the high-basis-weight and high-thickness portion 41, the absorbing member is more densely configured, and the liquid suction force is more excellent. The absorbent core 20 has the function of attracting liquid from the skin side. The force of attracting the liquid is generated by the capillary force of the absorbent core 20. The capillary force is proportional to the density of the absorbent member constituting the absorbent core. It becomes stronger proportionally. That is, by providing the high-density, high-basis-weight, low-thickness portion 42 and the capillary force works, it is easy to suck the liquid from the skin surface side and suppress the sucked liquid from reaching the side edge of the absorbent core. Furthermore, since the compressed high-density, high-basis-weight and low-thickness portion 42 is provided to extend in the front-rear direction X over the entire length of the intermediate core portion 22 that becomes the opposite portion of the excretion portion, it has a high basis weight and low thickness. The liquid absorbed in the portion 42 is guided in the diffusion direction so as to diffuse in the front-rear direction X, thereby suppressing side leakage.

In the present embodiment, at least one wide longitudinal 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, higher rigidity, and less deformation. Regarding the case where the difficult deformation of the high basis weight and high thickness portion 41 is transmitted to the back of the high basis weight and thick 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. In addition, the number of the wide vertical groove portions 27a located behind the high basis weight and high thickness portion 41 is not limited to one, and may be plural. In addition, in this embodiment, the center of the width direction Y of the high basis weight and high thickness portion 41 and the center of the width direction Y of the wide vertical groove portion 27a are located on the same straight line along the front and rear direction X, but not 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 shifted, as long as the wide vertical groove portion 27a is positioned at the high basis weight and thickness Just after the part 41.

Furthermore, in the present embodiment, in the rear core portion 23, the wide longitudinal groove portion 27a is located in the central region in the width direction Y, and the narrow longitudinal groove portion 27b is located in both sides in the width direction Y. Thereby, the rigidity in the bending direction of the central area in the width direction Y where the wide vertical groove portion 27a is located is lower than that of the area on both sides in the width direction Y where the narrow vertical groove portion 27b is located. By providing longitudinal grooves with different groove widths in this way, the rigidity distribution in the width direction of the rear core part 23 is adjusted, so that when the wearer wears the sanitary napkin 1, the rear core part 23 is wider The widthwise central region 65 where the longitudinal groove portion 27a is located is easy to use the wide longitudinal groove portion 27a as the starting point of deformation, and the side areas 66, 66 where the narrower longitudinal groove portion 27b is located preferentially face the wearer The way the skin side protrudes is deformed. Since the central region 65 in the width direction of the rear core portion 23 is deformed in such a way that it protrudes toward the skin side along the gluteal cleft of the buttocks, there is a gap between the wearer’s gluteal cleft and the absorbent article 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 preferentially deformed central region 65 and deform along the protrusion of the buttocks. Thereby, the gap between the buttocks and the sanitary napkin 1 is reduced, the conformability is improved, and the leakage at the rear part, especially the side leakage, is suppressed. In addition, even when the wearer is lying on his back and the hips are deformed due to the bedding, since the rear core portion 23 is easily deformed along the shape of the body, even menstrual blood excreted from the excretory part of the wearer The liquid material flows out to the rear part, and is also quickly absorbed by the absorbent core 20, thereby suppressing liquid leakage at the rear part.

As described above, the absorbent article of this embodiment is provided with a high basis weight part having a high basis weight and low thickness part and a high basis weight and high thickness part, thereby reducing the rigidity and giving the wearer a comfortable feeling of use, and It has sufficient liquid absorption capacity, improves compliance with the excretion part, does not easily leak sideways in the middle core part, and has excellent absorption performance. Furthermore, in the absorbent article of this embodiment, by providing a wide longitudinal groove part behind the high basis weight and high thickness part, the difficult deformation of the high basis weight and high thickness part is suppressed from affecting the flexibility of the rear core part. In addition, by arranging a plurality of longitudinal grooves with different widths in the rear core part, the rear core part is flexible and easy to deform along the shape of the body, so that the rear core part is conformable Improved performance and suppress leakage at the rear, especially side leakage. In addition, the absorbent core 20 of the present embodiment is not provided in the rear core in the area with a relatively high basis weight in the entire absorbent core 20 like the high basis weight part 4 provided in the middle core part 22 The part 23 reduces the hard feeling of the rear part of the sanitary napkin 1 and gives the wearer a comfortable feeling of use, and the conformability is improved as described above, so the liquid is not easy to leak.

Furthermore, as in the present embodiment, a plurality of wide longitudinal groove portions 27a are arranged in the rear core portion 23, and they are arranged behind the high basis weight portion 4 of the middle core portion 22, thereby When the center region 65 in the width direction protrudes toward the skin side when worn, the high basis weight 4 is lifted up, and the adhesion with the excretory part becomes high, so it is effective for suppressing the lateral leakage of body fluids. Moreover, if there is a boundary groove portion 61 between the middle 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 periphery of the high basis weight portion 4, then The high base weight part 4 is easier to lift as a whole. In particular, in a structure in which the width of the front and rear direction X rear end portion side of the high basis weight portion 4 is narrower than the width of the front and rear direction X center side, it is easier to lift.

In addition, in this embodiment, a wide vertical groove portion 27a is provided behind the high basis weight and low thickness portion 42 extending in the front-rear direction of the middle core portion 22. 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 difficult 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 Part 27a (left and right wide vertical groove part 27a). Therefore, the rear core portion 23 can be made flexible, the conformability at the rear core portion is improved, and the leakage at the rear portion is further suppressed.

Moreover, in the absorbent core 20 of this embodiment, as shown in FIG. 3, the thickness t1 of the bottom of the groove forming the central wide vertical groove portion 27a is greater than that of the groove forming the left and right wide vertical groove portions 27a. The bottom of the groove has a thin thickness t2. Thereby, the rigidity of the bottom of the wide vertical groove portion 27a forming the center is lower than that of the bottom of the left and right wide vertical groove portions 27a. Therefore, when the sanitary napkin 1 is worn, the absorbent core 20 tends to use the central wide longitudinal groove 27a as the starting point of deformation, and protrude more preferentially toward the wearer’s skin than the left and right wide longitudinal grooves 27a. The way it deforms, and the sanitary napkin 1 is easy to follow the crotch part that is sharply recessed relative to the protrusion of the buttocks. By this, the conformability is further improved, and leakage at the rear is suppressed. Furthermore, in this embodiment, the rigidity of the bottom forming the groove is changed by changing the thickness of the bottom, but the thickness of the bottom can also be set to be the same, and the wide longitudinal groove 27a in the center The width of the groove is wider than the left and right wide longitudinal groove portions 27a, and the rigidity of the bottom of the groove portion is changed.

In addition, by providing a longitudinal groove portion 27c extending in the front-rear direction X in the center of the width direction Y of the high basis weight and high thickness portion 41, the high basis weight and high thickness portion 41 It is easy to follow the excretion 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 between the middle core portion 22 and the rear core portion 23, the sanitary napkin 1 can easily use the boundary groove portion 61 as the starting point of deformation in the front-rear direction X When bent upward, the sanitary napkin 1 is easily deformed along the shape of the excretory part of the wearer's body to the back side, and the conformability is improved, thereby preventing liquid leakage. In addition, by providing the boundary groove portion 61, the external force acting on the middle core portion 22 on the boundary groove portion 61 is alleviated, and the deformation of the middle core portion 22 is not easily transmitted to the rear core portion 23. Similarly, the deformation of the rear core portion 23 is not easily transmitted to the middle 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.

In addition, in this embodiment, in addition to the longitudinal groove portion 27 being arranged over the entire length of the front and rear direction X of the sanitary napkin 1, the lateral groove portion 28 is also arranged, so that the sanitary napkin 1 can be easily worn along the front and rear direction X. The shape of the wearer's target part is deformed, and the conformability is improved. In addition, in this embodiment, the absorbent core can be improved by providing longitudinal grooves 27, lateral grooves 28, peripheral grooves 29, and boundary grooves 60 and 61 that are low in basis weight and easy to deform. 20 softness, and seek to improve the wearability. In addition, by providing the groove part, the discharged liquid can be quickly introduced into the space of the groove and taken into the absorbent core 20, so that the liquid absorption speed can be increased. Moreover, by dividing the absorbent core 20 into a plurality of square parts, the surface area of the absorbent core 20 can be increased, and liquid can be absorbed and retained efficiently.

In addition, in the above-mentioned embodiment, since the absorbent core 20 has an indented portion, and the width of the middle core portion 22 that becomes the opposite portion of the excretion portion is narrowed, the absorbent core 20 can be exposed to The external force decreases from the legs of the wearer on the outer side in the width direction toward the inner side in the width direction, so that the deformation of the middle core portion 22 can be suppressed. Thereby, the sanitary napkin 1 is easily adhered to the body of the wearer, and the deviation from the skin is suppressed.

[Additional explanation of this embodiment] Hereinafter, a supplementary description of this embodiment will be given. The numerical examples of each configuration are described, but these numerical values are just examples and are not limited to the numerical values described here. (Numerical example of each composition) Hereinafter, regarding the width of the high basis weight part 4, the width of the high basis weight part and the high thickness part 41, the width of the high basis weight and low thickness part 42 and the width of the low basis weight part 25, the width of the high basis weight part 4 is in front and back In the case of unevenness in the direction 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 base weight part 4. The width of the high basis weight portion 4 arranged in the central region in the width direction of the middle 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 setting the width in this range, sufficient absorption can be ensured. The high basis weight part 4 has a high basis weight and low thickness part 42 obtained by locally reducing the thickness by compressing both sides thereof. By reducing the thickness in this way, the firmness of wearing can be reduced. 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 more 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 to be the protruding portion of the absorbent core 22 into such a range, the conformability to the excretory portion of the wearer can be improved. From the viewpoint of suppressing the generation of friction and spreading the absorbed liquid in the front-rear direction, the width b of the high basis weight and low thickness portion 42 is preferably narrower than the width a of the higher basis weight and high thickness portion 41. In addition, 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 more 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 more preferably 30 mm or less, and more preferably 20 mm or less.

From the viewpoint of sufficiently ensuring 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 Below, it is more preferably 650 g/m ² or less. From the viewpoint of making liquid absorbency appropriate and reducing rigidity moderately, 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 It is 350 g/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 more 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 more preferably 6 mm or less, more preferably 5.5 mm or less. Regarding 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, from the viewpoint of the conformability of the high basis weight and high thickness portion 41 to the excretion portion, it is preferably 0.5 mm or more, It is more preferably 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 horizontal groove portion 28 are preferably 0.5 mm or more, more preferably 1 mm or more, and more preferably 10 mm or less, and more preferably 5 mm or less. Arranged at the boundary between the middle 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) along the Y axis direction The width of the boundary groove portions 61 (60) arranged in an extended manner is preferably 1.5 mm or more, more preferably 2 mm or more, and more preferably 3.5 mm or less, more preferably 3 mm or less. In addition, the width of the wide longitudinal groove portion 27a is preferably 1 mm or more, more preferably 2 mm or more. In addition, 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. Furthermore, the rigidity of the central region in the width direction of the rear core portion 23 is higher than that of the width direction side. From the viewpoint that the square area is appropriately reduced, it is preferably twice or more.

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 square portion, for example, 25 g/m ² or more. Moreover, it is 300 g/m ² or less. As shown in FIG. 3, the bottom thickness t1 of the three wide longitudinal grooves 27a arranged in the center region 65 in the width direction of the rear core portion 23 is higher 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 longitudinal groove portion 27a arranged in the middle 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 part, the high basis weight and low thickness part, the low basis weight part, and the lateral outer width, the absorbent core can be placed horizontally and a microscope (VHX-1000 manufactured by KEYENCE) can be used. The measurement magnification is adjusted to enlarge the skin facing surface 20a to measure the width.

(Method for measuring the basis weight of each part of the absorbent core) Each part of the absorbent core 20 as a measurement target was cut using a single-edged razor manufactured by Feather, and small pieces were obtained so as to have a predetermined area. Use an electronic balance (electronic balance GR-300 manufactured by A&D Company, precision: 4 digits after the decimal point) to measure the weight of these small pieces. Divide the calculated weight by the area of each piece to calculate the basis weight of the piece. Regarding each part, the average of the basis weights of 5 small pieces shall be the basis weight.

(Method for measuring the thickness of each part of the absorbent core) The measurement of the thickness of the absorbent core as a measurement object is performed by measuring the thickness of the small pieces cut out to measure the basis weight of each part. The small pieces cut from the absorbent core are pressurized at a pressure of 5 kPa for 10 minutes, and the measurement is performed immediately after weight removal. Place a circular aluminum plate with a diameter of 25 mm, a thickness of 3 mm, and a mass of 2.45 g horizontally and slowly in the central area of the sample after weight removal. Use the non-contact laser shift meter (laser head LK) manufactured by KEYENCE -G30, displacement meter LK-GD500) measure the thickness of the sample. When the size of the cut piece is small and it is difficult to measure with a non-contact laser shift meter, for example, a microscope (VHX-1000 manufactured by KEYENCE) can be used to observe the cut at a magnification of 20 to 100 times. The profile of the obtained sample is measured.

As mentioned above, the embodiment of the present invention has been described, but the present invention is not limited to the above-mentioned embodiment. Of course, various changes can be made without departing from the spirit of the present invention. For example, in the above-mentioned embodiment, although the example of the menstrual sanitary 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. In addition, in the above-mentioned embodiment, the example in which three wide longitudinal groove portions 27a are provided in the rear core portion 23 is exemplified. However, the absorbent core 70 shown in FIG. One wide vertical groove portion 27a is provided behind the thickness portion 41, and the other vertical groove portion is referred to as a narrow vertical groove portion 27b. In addition, in the above-mentioned embodiment, the absorbent core 20 has a shape with a shrinkage, but like the absorbent core 71 shown in FIG. 6, it may have a shape with a uniform width over the entire length in the front-rear direction. In FIG. 5 and FIG. 6, the same reference numerals are given to the same components as in the above-mentioned embodiment, and the description is omitted. By providing at least one wide longitudinal 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 a narrow longitudinal groove portion 27b, the above-mentioned effects can be obtained. effect.

In addition, in the above-mentioned embodiment, the high basis weight portion 4 protrudes toward the upper side in the thickness direction Z, but it may be replaced with a form protruding toward the lower side in the thickness direction Z as shown in FIG. 7. In addition, in the above-mentioned embodiment, various grooves such as the vertical groove portion 27, the lateral groove portion 28, the peripheral groove portion 29, and the boundary grooves 60, 61 provided in the absorbent core 20 are on the upper side in the thickness direction Z Although it has an opening, it may replace with it and may have an opening on the lower side of the thickness direction Z as shown in FIG. Regarding the above-mentioned embodiments of the present invention, the following notes are further disclosed.

(1) An absorbent article comprising an absorbent core having a front square 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 portion The intermediate core portion between the body portions, and the intermediate core portion has: a high basis weight portion, which is located in the central region in the width direction, and has a basis weight higher than the front core portion and the rear core portion; and a low basis The heavy part is located 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 located at 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 part and the high-thickness part, and the thickness is thinner than the high-basis-weight and high-thickness part; The wide vertical groove part behind the high thickness part and the narrow vertical groove part narrower than the said wide vertical groove part. (2) The absorbent article as described in (1), wherein the rear core portion has a width extending in the front-rear direction, which is wider than the narrow longitudinal groove portion, after the high basis weight and low thickness portion.槽部。 The groove. (3) The absorbent article according to (2), wherein the narrow longitudinal groove portion is interposed between the wide longitudinal groove portion located behind the high basis weight and high thickness portion and the high basis weight and low thickness portion Located on both sides in the width direction. (4) The absorbent article as described in (2) or (3), wherein the thickness of the bottom of the wide longitudinal groove portion formed behind the high basis weight and high thickness portion is greater than that of the bottom portion located behind the high basis weight and low thickness portion The thickness of the bottom of the above-mentioned wide longitudinal groove of the square is thin. (5) The absorbent article as described in any one of (1) to (4), wherein the intermediate core portion further has a longitudinal groove portion which is located at the center in the width direction of the high basis weight and high thickness portion It extends along the front-rear direction and has a basis weight lower than the above-mentioned high basis weight part. (6) The absorbent article according to any one of (1) to (5), wherein the absorbent core has a basis weight lower than the above in the width direction at the boundary between the middle core part and the rear core part. The junction groove with low base weight. (7) The absorbent article according to (6), wherein the rear end 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 absorbent core has a basis weight lower than the above in the width direction at the boundary between the front core portion and the middle core portion. The junction groove with low base weight. (9) The absorbent article according to (8), wherein the front end 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 outer edges formed along at least the front and rear direction of the high basis weight portion on the high basis weight portion and the low basis weight portion. The peripheral groove between the heavy parts. (11) The absorbent article according to (10), wherein the peripheral groove portion is provided along the 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 larger basis weight along the width direction at the boundary between the middle core part and the rear core part or the front core part. The low basis weight portion has 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 or more, more preferably 60 mm or less, more preferably 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 Below, more preferably 30 mm 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 Below, more preferably 7.5 mm or less. (17) The absorbent article as described in 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, it is 20 mm or less. (18) The absorbent article as described in any one of (1) to (17), wherein the width of the wide longitudinal 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 longitudinal groove portion is 1.5 times or more of the groove width of the narrow longitudinal groove portion, preferably 2 Times 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 vertical groove part that is narrower than the aforementioned wide vertical groove part. (twenty two) The absorbent article according to any one of (1) to (21), wherein the high basis weight portion has a shape in which the width of the rear end portion in the front-rear direction is narrower than the center 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.

1: Absorbent items (sanitary napkins) 4: High base weight 11: Absorber 12: Front sheet 13: Back sheet 14: Side sheet 16: compression groove 20: Absorbent core 20a: The opposite side of the skin 21: Front core 21a: Inclined part 22: Middle core 23: Rear core body 23a: inclined part 25: Low base weight 27: Longitudinal groove 27a: Wide longitudinal groove 27b: Narrow longitudinal groove 27c: Longitudinal groove 28: Horizontal groove 29: Peripheral groove 30: package chip material 41: High base weight and high thickness part 42: High basis weight and low thickness part 45: front end 46: rear end 60: Junction groove 61: Junction groove 65: Central area in the width direction 66: Side area in the width direction 70: Absorbent core 71: Absorbent core 291: Straight 292: bend 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: area R2: area W: Wing X: front and rear direction Y: width direction Z: Up and down 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 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 constituting a 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 an absorbent core according to another embodiment. Fig. 7 is a cross-sectional view of an absorbent body for explaining another arrangement example of the absorbent body in the absorbent article.

4: High base weight

20: Absorbent core

20a: The opposite side of the skin

21: Front core

21a: Inclined part

22: Middle core

23: Rear core body

23a: inclined part

25: Low base weight

27: Longitudinal groove

27a: Wide longitudinal groove

27b: Narrow longitudinal groove

27c: Longitudinal groove

28: Horizontal groove

29: Peripheral groove

41: High base weight and high thickness part

42: High basis weight and low thickness part

45: front end

46: rear end

60: Junction groove

61: Junction groove

291: Straight

292: bend

D1: width

D2: width

D3: width

L1: imaginary line segment

L2: imaginary line segment

P1: Junction

P2: Junction

R1: area

R2: area

X: front and rear direction

Y: width direction

Z: Up and down direction (thickness direction)

Claims (23)

An absorbent article comprising an absorbent core having a front square 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 portion The middle core between the bodies, and The intermediate core portion has: a high basis weight portion located in a central region in the width direction and a basis weight higher than the front core portion and the rear core portion; and a low basis weight portion located on both sides in the width direction , And has a lower basis weight than the above-mentioned high basis weight part; The high basis weight portion has: a high basis weight and high thickness portion located at the center portion in the width direction; and a high basis weight and low thickness portion located on both sides of the high basis weight portion in the width direction and the thickness is higher High basis weight and thin thickness; The rear core body portion has a wide longitudinal groove portion extending in the front-rear direction and located behind the high basis weight and high thickness portion, and a narrow longitudinal groove portion narrower than the wide longitudinal groove portion . The absorbent article of claim 1, wherein the rear core portion is behind the high basis weight and low thickness portion and further has a wide longitudinal groove extending in the front-rear direction and wider than the narrow longitudinal groove portion Slot. An absorbent article according to claim 2, wherein the narrow longitudinal groove portion is located in the middle between the wide longitudinal groove portion located behind the high basis weight and high thickness portion and the high basis weight and low thickness portion. Direction on both sides. The absorbent article of claim 2 or 3, wherein the thickness of the bottom of the wide longitudinal groove portion formed behind the high basis weight and high thickness portion is greater than the thickness of the wide width located behind the high basis weight and low thickness portion The bottom of the longitudinal groove is thin. The absorbent article according to any one of claims 1 to 3, wherein the intermediate core portion further has a longitudinal groove portion extending in the front-rear direction at the center of the width direction of the high basis weight and high thickness portion And the basis weight is lower than the above-mentioned high basis weight part. An absorbent article according to any one of claims 1 to 3, wherein the absorbent core at the boundary between the middle core part and the rear core part has a basis weight lower than the low basis weight part along the width direction The junction groove department. The absorbent article according to claim 6, wherein the rear end of the high basis weight portion is adjacent to the boundary groove portion. The absorbent article according to any one of claims 1 to 3, wherein the absorbent core at the boundary between the front core portion and the middle core portion has a basis weight lower than the low basis weight portion along the width direction The junction groove department. The absorbent article according to claim 8, wherein the front end of the high basis weight portion is adjacent to the boundary groove portion. The absorbent article according to any one of claims 1 to 3, wherein the intermediate core portion has an outer edge formed along at least the front-rear direction of the high basis weight portion between the high basis weight portion and the low basis weight portion The peripheral groove part. The absorbent article according to claim 10, wherein the peripheral groove portion is a groove provided along the side edge of the high basis weight and low thickness portion and the basis weight is lower than the low basis weight portion. The absorbent article of claim 10, wherein the absorbent core has a basis weight lower than the low basis weight part along the width direction at the boundary between the middle core part and the rear core part or the front core part The boundary groove portion is connected to the boundary groove portion. The absorbent article according to any one of claims 1 to 3, 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 or more, Moreover, it is preferably 60 mm or less, and more preferably 50 mm or less. The absorbent article according to any one of claims 1 to 3, 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 It is less than 30 mm. The absorbent article according to any one of claims 1 to 3, 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 any one of claims 1 to 3, 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 It is less than 7.5 mm. The absorbent article according to any one of claims 1 to 3, 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 20 mm or less. The absorbent article according to any one of claims 1 to 3, 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 any one of claims 1 to 3, wherein the width of the wide longitudinal groove portion is 1.5 times or more, preferably 2 times or more, of the groove width of the narrow longitudinal groove portion. The absorbent article according to any one of claims 1 to 3, 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 any one of claims 1 to 3, 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 relatively A narrow longitudinal groove part narrow in the aforementioned wide longitudinal groove part. An absorbent article according to any one of claims 1 to 3, wherein the high basis weight portion has a shape in which the width of the rear end portion in the front-rear direction is narrower than the center portion in the front-rear direction. The absorbent article according to any one of claims 1 to 3, wherein the absorbent article is a menstrual sanitary napkin.

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