JP6886798B2 - Absorbent article - Google Patents

Description

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

Conventionally, in absorbent articles such as sanitary napkins, when the amount of excreted liquid is large, it may lead to liquid leakage even in daily activities. Therefore, the applicant has applied a method for preventing liquid leakage by providing a middle-high portion having a large basis weight in the central portion of the excretion facing area which is arranged to face the liquid excretion portion of the wearer in the absorbent core of the absorbent article. Proposed (for example, Patent Document 1).

For example, Patent Document 1 proposes a technique in which a middle-high portion having a large basis weight is provided in the central portion of an excretion facing area and a horizontal groove and a vertical groove having a low basis weight are provided in the middle-high portion in the absorbent core of an absorbent article. .. According to the absorbent article described in Patent Document 1, by diffusing the liquid without staying at the excretion point, it is possible to improve the wearing feeling and prevent the liquid from leaking.

Japanese Unexamined Patent Publication No. 2012-125366

In the absorbent article described in Patent Document 1, if the absorbent article cannot be worn at an appropriate position on the body when worn, the wearing position may be displaced in the front-back direction or the left-right width direction of the body. In some cases, the effect of the absorbent article described in Patent Document 1 could not be sufficiently obtained. As described above, the absorbent article described in Patent Document 1 has room for further improvement.

Therefore, the present invention is to provide an absorbent article capable of eliminating the above-mentioned drawbacks of the prior art.

The present invention is an absorbent article comprising an absorbent core having a vertically long shape corresponding to the front-back direction of the wearer and having a front area and a rear area, wherein the absorbable core is located on the front area side. There is an intermediate region between the first region and the second region located on the rear region side, and the intermediate region is thicker than the thickness in the first region and the second region and the first region is thicker than the thickness in the first region and the second region. A middle-high portion having a basis weight higher than the basis weight in one region and the second region is provided, and the middle-high portion has a horizontal direction orthogonal to the vertical direction of the absorbent core in a plan view of the absorbent core. A middle-high central portion extending over the entire length of the absorbent core and extending to a predetermined length in the vertical direction according to both side edges along the vertical direction of the absorbent core, the first from the vertical front end portion of the middle-high central portion. It has one front-side convex portion that is convex toward the region side, and one rear-side convex portion that is convex toward the second region side from the vertical rear end portion of the middle-high central portion. Provided is an absorbent article, wherein the middle-high portion has a middle-high lateral groove portion extending in the lateral direction at at least one of the front-side convex portion and the rear-side convex portion in a plan view of the absorbent core. To do.

According to the present invention, even if the absorbent article is worn in a slightly displaced state, it is less likely to give the wearer a sense of discomfort due to its excellent fit to the body shape, and it is less likely to form a gap between the absorbent article and the wearer's skin. , Sufficient absorption performance can be exhibited.

FIG. 1 is a plan view showing a skin-facing surface side (skin-side sheet side) of a sanitary napkin, which is a preferred embodiment of the absorbent article of the present invention. FIG. 2 is a plan view of the absorbent core of the sanitary napkin shown in FIG. 1 on the side facing the skin. FIG. 3 is a cross-sectional view schematically showing a cross section taken along line III-III of FIG. FIG. 4 is a cross-sectional view schematically showing a cross section taken along line IV-IV of FIG. 5 (a) to 5 (b) are explanatory views illustrating a manufacturing process of an absorbent core provided in the sanitary napkin shown in FIG. FIG. 6 is a perspective view of the absorbent core of the sanitary napkin of Comparative Example 1.

Hereinafter, the absorbent article of the present invention will be described with reference to the drawings based on the sanitary napkin 1 (hereinafter, also referred to as “napkin 1”) which is a preferred embodiment thereof. FIG. 1 shows a plan view of the napkin 1 of the present embodiment as viewed from the skin side sheet side. As shown in FIG. 1, the napkin 1 of the present embodiment includes an absorbent core 41 having a shape long in the vertical direction X corresponding to the front-back direction of the wearer, and has a front area A and a rear area C. As shown in FIG. 1, the napkin 1 has an excretion facing area B arranged to face the liquid excretion portion of the wearer, and an anterior area A and a posterior area C arranged before and after the excretion facing area B in the vertical direction X. It is divided into.

In the present specification, the vertical direction X corresponds to the front-back direction of the wearer and corresponds to the longitudinal direction of the absorbent article (napkin 1), and the lateral direction Y is the width direction of the absorbent article (napkin 1). It matches (the direction orthogonal to the longitudinal direction). Therefore, unless otherwise specified, in the present specification, the length in the longitudinal direction (vertical direction X) means the "length" which is the distance measured in the vertical direction X, and the length in the horizontal direction Y. The length means the "width" which is the distance measured in the lateral direction Y. The napkin 1 is formed symmetrically with respect to the center line CL extending in the vertical direction X. The vertical direction X is also a direction parallel to the center line CL. Further, in the present specification, the skin-facing surface is a surface of the absorbent article (napkin 1) or its constituent member, for example, the absorbent body 4, which is directed toward the skin side of the wearer when the absorbent article (napkin 1) is worn. The non-skin facing surface faces the side opposite to the skin side (clothing side) when the absorbent article (napkin 1) is worn in the absorbent article (napkin 1) or its constituent member, for example, the absorbent body 4. It is the surface to be.

The napkin 1 has an excretion facing area B that is arranged to face the wearer's liquid excretion part (vaginal opening, etc.) when worn, and a front area that is arranged closer to the wearer's ventral side (anterior side) than the excretion facing area B. It has A and a rear area C arranged closer to the back side (rear side) of the wearer than the excretion facing area B. That is, the napkin 1 is divided in the vertical direction X in the order of the front area A, the excretion facing area B, and the rear area C.

In the absorbent article of the present invention, the excretion facing area B is a region having a wing portion 1W in the vertical direction X (one wing portion) when the napkin 1 of the present embodiment has a wing portion 1W. It means a region sandwiched between the root along the vertical direction X of 1W and the root along the vertical direction X of the other wing portion 1W). Further, in the case of an absorbent article having no wing portion, two folding curves (2) crossing the absorbent article in the lateral direction Y, which are generated when the absorbent article is folded into a tri-fold individual packaging form. (Not shown) means a region surrounded by the first folding curve and the second folding curve counting from the front end of the absorbent article in the vertical direction X.

As shown in FIG. 1, the napkin 1 of the present embodiment includes a liquid-permeable skin-side sheet 2 that forms a skin-facing surface, a non-skin-side sheet 3 that forms a non-skin-facing surface, and both sheets 2 and 3. It includes an absorber 4 interposed between them. The absorber 4 is composed of an absorbent core 41 and a core wrap sheet (not shown) that wraps the absorbent core 41.

In the napkin 1, as shown in FIG. 1, the skin-side sheet 2 covers the entire skin-facing surface of the absorber 4, and extends outward in the horizontal direction Y from both side edges of the absorber 4 along the vertical direction X. It is out. On the other hand, the non-skin side sheet 3 covers the entire area of the non-skin facing surface of the absorber 4, and further extends from both side edges of the skin side sheet 2 along the vertical direction X to the outside in the horizontal direction Y, which will be described later. A side flap portion 1S is formed together with the side seat 5. The non-skin side sheet 3 and the side sheet 5 are joined to each other by known joining means such as an adhesive, a heat seal, and an ultrasonic seal at the extending portions from both side edges of the absorber 4 along the vertical direction X. There is. The skin-side sheet 2 and the non-skin-side sheet 3 and the absorber 4 may be bonded by an adhesive.

In the napkin 1, as shown in FIG. 1, the side seats 5 are arranged on both sides of the skin side sheet 2 on the skin facing surface along the vertical direction X. Preferably, the side seats 5 are arranged over the entire length of the skin side sheet 2 in the vertical direction X so as to overlap the left and right side portions of the skin side sheet 2 along the vertical direction X in a plan view.

In the napkin 1, the pair of side sheets 5 and 5 are joined to the skin side sheet 2 at the joint portion 6 as shown in FIG. 1, respectively. The wavy joints 6 in which the irregularities in the horizontal direction Y due to the curves are alternately arranged continuously in the vertical direction X are arranged symmetrically in the horizontal direction Y with the center line CL as the center in a plan view. In this way, when the side sheet 5 is joined to and fixed to the skin side sheet 2 at the wavy joint portion 6, it is located inward in the lateral direction Y than the joint group of the joint portions 6 arranged in a wavy shape. , A space portion defined by the side sheet 5 and the skin side sheet 2 is formed. Since this space is open toward the center line CL, body fluids such as menstrual blood flowing outward from the center of the lateral direction Y are accommodated in the space, and as a result, body fluid leaks. Can be effectively prevented.

In the napkin 1, as shown in FIG. 1, the side flap portion 1S projects largely outward in the lateral direction Y in the excretion facing area B, whereby the napkin 1 is provided on both the left and right sides along the vertical direction X. In addition, a pair of wing portions 1W and 1W will be provided. The wing portion 1W is used by being folded back toward the non-skin facing surface side of the crotch portion of clothing such as shorts. Further, as shown in FIG. 1, the skin-side sheet 2 and the non-skin-side sheet 3 extend outward from each of the front end and the rear end of the absorber 4 in the vertical direction X, and the extending portions thereof. In the above, the end seal portion is formed by being bonded to each other by a known bonding means such as an adhesive, a heat seal, and an ultrasonic seal.

As shown in FIG. 1, the napkin 1 includes a linear squeezing groove 7 in which the skin-side sheet 2 and the absorbent core 41 are squeezed and integrated. Preferably, in the napkin 1, a linear pressing groove 7 is formed on the skin-facing surface of the skin-side sheet 2 so that the skin-side sheet 2 and the absorber 4 are integrally recessed toward the non-skin-side sheet 3 side. ing. "Linear" in the linear pressing groove 7 means that the shape of the groove (recessed portion) is not limited to a straight line in a plan view but includes a curved line. As long as the linear pressing groove 7 extends linearly, the thickness of the bottom of the groove may be constant, and the thickness of the bottom of the groove may not be constant. Examples of the squeezing groove in which the thickness of the bottom of the groove is not constant include, for example, a portion that is relatively deeply dented (high-pressure squeezing portion) and a portion that is relatively shallowly dented (low-pressure squeezing portion) at the bottom of the squeezing groove. The formed morphology can be mentioned. In the linear pressing groove 7, the density of each fiber which is a constituent member of the skin side sheet 2 and the absorber 4 is higher than the density of the peripheral portion of the linear pressing groove 7.

In the napkin 1, as shown in FIG. 1, the linear squeezing groove 7 is a pair of vertical squeezing grooves 73, 73 extending in the vertical direction X of the absorbent core 41 and a pair of vertical squeezing grooves 73, 73 in the lateral direction Y. It has a pair of second vertical squeezing grooves 73A and 73A on the outside of the. Preferably, in the napkin 1, the linear squeezing groove 7 is formed in the front area A and the rear area C of the absorber 4, respectively, of the first lateral squeezing groove 71 extending in the lateral direction Y and the excretion facing area B of the absorber 4. It has vertical squeezing grooves 73 extending in the vertical direction X on both sides along the vertical direction X. In the napkin 1, the first lateral squeezing groove 71 has a curved shape that is convex outward in the vertical direction X, and the vertical squeezing groove 73 has a curved shape that is convex outward in the lateral direction Y in the excretion facing area B. Is. The first lateral squeezing groove 71 extends inward from the pair of vertical squeezing grooves 73 and extends in the lateral direction Y over the pair of vertical squeezing grooves 73. In the napkin 1, the first lateral squeezing groove 71 in the front area A, one longitudinal squeezing groove 73, the first lateral squeezing groove 71 in the rear area C, and the other longitudinal squeezing groove 73 are connected to form a ring-shaped all-around groove. Is forming. The linear squeezing groove 7 formed in this way can suppress the diffusion of the body fluid in the plane direction of the absorber 4 and effectively prevent the liquid from leaking from the periphery of the napkin 1. The pair of second longitudinal squeezing grooves 73A, 73A is a first lateral squeezing groove 71 in the front area A forming a ring-shaped all-around groove, one longitudinal squeezing groove 73, and a first lateral squeezing groove 71 in the rear area C. And the other vertical squeezing groove 73 are arranged independently. Like the vertical squeezing groove 73, the second vertical squeezing groove 73A has a curved shape that is convex outward in the lateral direction Y in the excretion facing area B.

In the napkin 1, as shown in FIG. 2, the absorbent core 41 constituting the absorber 4 has a first region 41F located on the front area A side in the vertical direction X and a second region 41R located on the rear area C side. And has an intermediate region 41M between the first region 41F and the second region 41R. The intermediate region 41M includes a middle / high portion 42. In the napkin 1, the intermediate region 41M of the absorptive core 41 is located in the excretion facing area B. Preferably, in the napkin 1, the intermediate region 41M of the absorptive core 41 and the excretion facing area B coincide with each other in the vertical direction. Therefore, the napkin 1 has a middle and high portion 42 in the excretion facing area B. In the napkin 1, as shown in FIG. 2, the size of the front area A of the napkin 1 and the size of the first region 41F of the absorbent core 41 are substantially the same, and the rear area of the napkin 1 is substantially the same. The size of C and the size of the second region 41R of the absorbent core 41 are substantially the same.

When the napkin 1 is provided with a pair of wing portions 1W on both outer sides of the lateral direction Y, an intermediate region 41M exists between the roots of the wing portions 1W arranged at intervals in the vertical direction X in each wing portion 1W. doing. More specifically, the intermediate region 41M of the napkin 1 exists between the roots of the wing portions 1W arranged at intervals in the vertical direction X in each wing portion 1W. The size of the front area A of the napkin 1 and the size of the first region 41F of the absorbent core 41 are substantially the same, and the size of the rear area C of the napkin 1 and the size of the second region 41R of the absorbent core 41. When the values are substantially the same, the length of the intermediate region 41M of the napkin 1 in the vertical direction X is the distance between the roots of the wing portions 1W arranged at intervals in the vertical direction X in each wing portion 1W. Same as length.

Further, the intermediate region 41M is each of the first region 41F located in front of the intermediate region 41M and the second region 41R located behind the intermediate region 41M, except for the middle-high boundary groove portion 43 described later and the middle-high lateral groove portion 47 described later. The thickness is thicker than the thickness of the absorbent core 41 in the region. In the napkin 1, the absorbent core 41 has a long shape in the same direction as the vertical direction X of the napkin 1. Therefore, the vertical direction of the absorbent core 41 is the same as the vertical direction X of the napkin 1, and the horizontal direction of the absorbent core 41 is the same as the horizontal direction Y of the napkin 1.

As shown in FIG. 3, the thickness of the middle and high portion 42 included in the intermediate region 41M is formed to be thicker than the thickness of the first region 41F and the thickness of the second region 41R in the absorbent core 41, and the thickness thereof is formed. The basis weight is formed higher than the basis weight of the first region 41F and the basis weight of the second region 41R in the absorbent core 41. Here, the thickness and basis weight of the middle-high portion 42 mean the thickness and basis weight of the middle-high portion 42 in the portion where the middle-high boundary groove portion 43 described later and the middle-high lateral groove portion 47 described later do not exist. Further, the thickness and basis weight of the first region 41F and the second region 41R to be compared with the thickness and basis weight of the middle and high portions 42 are such that the groove portion 45 described later is formed in the first region 41F and the second region 41R. In the case, it means the thickness and the basis weight in the portion where the groove portion 45 does not exist in the first region 41F and the second region 41R. Since the absorbent core 41 of the napkin 1 is provided with a difference in thickness by providing a difference in the basis weight of the core material, it is different from the case where a part of the absorbent core having a uniform basis weight is compressed to provide a difference in thickness. The absorbent core 41 is flexible as a whole.

The thickness of the middle-high portion 42 is such that the first region 41F and the second region 41R of the absorbent core 41 project from the viewpoint of projecting the middle-high portion 42 toward the skin to improve the liquid absorbability of the absorbent core 41. The thickness is preferably 120% (that is, 1.2 times) or more, more preferably 140% or more, preferably 700% or less, more preferably 500% or less, and when worn. From the viewpoint of following the body and suppressing discomfort, it is preferably 120% or more and 700% or less, and more preferably 140% or more and 500% or less. The difference in thickness (former-latter) between the thickness of the middle and high portion 42 and the thickness of the first region 41F or the second region 41R is preferably 1.0 mm or more, more preferably 2.0 mm or more, and also. It is preferably 8.0 mm or less, more preferably 6.0 mm or less, and preferably 1.0 mm or more and 8.0 mm or less, more preferably 2.0 mm or more and 6.0 mm or less. The above-described configuration is particularly effective when the middle and high portions 42 are provided in the excretion facing area B as in the napkin 1 of the present embodiment.
Specifically, the thickness of the middle and high portion 42 is preferably 2.0 mm or more, more preferably 3.0 mm or more, preferably 10.0 mm or less, more preferably 7.0 mm or less, and preferably. Is 2.0 mm or more and 10.0 mm or less, more preferably 3.0 mm or more and 7.0 mm or less. In addition, it is preferable that the above-mentioned thickness relationship is established in the entire range of the middle-high portion 42, but when the increase / decrease is provided in the thickness direction of the middle-high portion 42, the above-mentioned relationship is established in the thickest portion. I just need to be there.
It is preferable that the thickness relationship is as described above in the entire range of the middle and high portion 42, but in the thickness direction of the middle and high portion 42, the thickness is gradually increased or decreased in the horizontal direction Y, the vertical direction X, or both directions. In such a case, the above relationship may be obtained at the thickest part.
Specifically, the thickness of the first region 41F or the second region 41R is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 7.0 mm or less, more preferably 3.5 mm or less. It is preferably 0.5 mm or more and 7.0 mm or less, and more preferably 1.0 mm or more and 3.5 mm or less.
In the napkin 1, the thickness of the first region 41F or the second region 41R is preferably formed substantially uniformly in the portion where the groove portion 45 described later does not exist, but the thickness of the first region 41F or the second region 41R is lateral to the first region 41F or the second region 41R. In the case where the thickness is gradually increased or decreased in the direction Y or the vertical direction X, the above relationship may be obtained at the thickest portion.
The thickness of each part of the absorbent core 41 such as the middle-high portion 42, the first region 41F or the second region 41R, and the middle-high adjacent portion 44 described later is measured by the following method.

<Measuring method of thickness of each part of absorbent core 41>
The absorbent core is allowed to stand in a horizontal place without wrinkles or bends, and the middle and high portions 42, the first region 41F, the second region 41R, and the like, which are the objects to be measured, are cut out from the absorbent core 41. Then, the thickness of the cut-out object to be measured under a load ^{of 5 cN / cm 2 is measured.} Specifically, for the thickness measurement, for example, a thickness meter PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) Is used. At this time, a plan-view circular or square plate (acrylic with a thickness of about 5 mm) whose size is adjusted so that ^{the load is 5 cN / cm 2} between the tip of the thickness gauge and the cut-out object to be measured. Place the plate) and measure the thickness. When measuring the thickness of the first region 41F or the second region 41R of the absorbent core 41, the thickness is measured so as not to include the groove portion 45 described later.

In the napkin 1, the basis weight of the middle-high portion 42 in the absorbent core 41 is preferably from the viewpoint of projecting the middle-high portion 42 toward the skin and improving the liquid absorbency of the absorbent core in the excretion facing area B. 100 g / m ² or more, more preferably 200 g / m ² or more, and preferably 1500 g / m ² or less, more preferably 1200 g / m ² or less, specifically, preferably 100 g / m ² or more. It is 1500 g / m ² or less, more preferably 200 g / m ² or more and 1200 g / m ² or less. The basis weight of the first region 41F or the second region 41R of the absorbent core 41 is preferably 50 g / m ² or more, more preferably 100 g / m ² or more, and preferably 1000 g / m. ^{It is 2} or less, more preferably 900 g / m ² or less, specifically, preferably 50 g / m ² or more and 1000 g / m ² or less, and more preferably 100 g / m ² or more and 900 g / m ² or less. The basis weight of the first region 41F or the basis weight of the second region 41R is the mass of the sample of the first region 41F or the second region 41R cut out as described in the method for measuring the thickness of each part of the absorbent core 41 described above. Is divided by the area of the surface of the sample facing the skin. When measuring the basis weight of the middle-high portion 42 in the absorbent core 41, the measurement is made so as not to include the middle-high boundary groove portion 43 described later and the middle-high lateral groove portion 47 described later. Further, when measuring the basis weight of the first region 41F or the basis weight of the second region 41R or the like in the absorbent core 41, the measurement is performed so as not to include the groove portion 45 described later.

As shown in FIG. 2, the middle-high portion 42 extends over the entire length of the absorbent core 41 in the horizontal direction Y orthogonal to the vertical direction X of the absorbent core 41 in a plan view, and the vertical portion 42 of the absorbent core 41 extends vertically. 1 that is convex toward the first region 41F from the front end of the middle-high central portion 421 and the middle-high central portion 421 extending to a predetermined length in the vertical direction X according to the side edges 41s and 41s along the direction X. It has one front convex portion 422 and one rear convex portion 423 that is convex from the rear end portion of the vertical direction X of the middle and high central portion 421 toward the second region 41R side. That is, in the napkin 1, the middle-high portion 42 is divided into a front-side convex portion 422, a middle-high central portion 421, and a rear-side convex portion 423.

As shown in FIG. 2, the middle-high central portion 421 of the middle-high portion 42 extends in a strip shape between both side edges 41s and 41s along the vertical direction X of the absorbent core 41, and is lateral to the middle-high central portion 421. The length in the direction Y is the same as the width of the absorbent core 41. Here, the width of the absorbent core 41 means the width of the absorbent core 41 including the middle and high portions 42. In the absorbent core 41, it is preferable to make the area of the middle-high central portion 421 as large as possible so that sufficient absorption performance can be exhibited even if the absorbent article is worn in a slightly displaced state. , It is preferable that there is a constant interval in the vertical direction X between the side edges 41s and 41s along the vertical direction X of the absorbent core 41, and the side edges 41s and 41s are parallel to the vertical direction X and respectively. It is more preferable that it is linear. Further, from the viewpoint of exhibiting sufficient absorption performance even when the mounting position of the napkin 1 is displaced and further improving the fit, the absorption core 41 has a maximum length in the lateral direction Y of the middle and high center portion 421. It is even more preferable that the length is the same as the maximum length in the lateral direction of Y. However, due to the lateral Y position shift of the middle and high part 42 in the absorbent core 41, the chipping of the middle and high part 42, the die cutting inclination due to the production method, the rounding and chamfering of the end, etc. during manufacturing, the middle and high part 42 If the width of the absorbent core 41 and the width of the absorbent core 41 are slightly different, for example, if the maximum width of the middle and high portion 42 and the maximum width of the absorbent core 41 are within a width difference of about 5%, they are the same width. .. The maximum width means the distance at the longest position in the lateral direction Y. In the napkin 1, as shown in FIG. 2, the maximum width of the middle and high portion 42 in the lateral direction Y (maximum length in the lateral direction Y) is the maximum width in the intermediate region 41M of the absorbent core 41 (horizontal direction Y). It is the same as the maximum width of the absorbent core 41 (the maximum length in the lateral direction Y).

The height of the middle-high central portion 421 of the middle-high portion 42 becomes lower in the napkin 1 from the central portion in the horizontal direction Y toward both side edges along the vertical direction X in a cross-sectional view as shown in FIG. It is formed like this. That is, the central portion arranged on the center line CL extending in the vertical direction X in the central portion 421 of the middle and high heights is formed to have the highest height. When the middle-high central portion 421 is formed in this way, the absorbability of the liquid in the excretion facing area B can be improved.

In the napkin 1, the middle-high central portion 421 of the middle-high portion 42 has a smaller basis weight from the central portion in the horizontal direction Y toward both side edges along the vertical direction X in a cross-sectional view as shown in FIG. It is formed like this. That is, the central portion arranged on the center line CL extending in the vertical direction X in the central portion 421 of the middle and high heights has the largest basis weight. When the middle-high central portion 421 is formed in this way, the absorbability of the liquid in the excretion facing area B can be improved.

The center height 421 of the napkin 1 is the height of the height (T1) of the center portion arranged on the center line CL at the smallest side edge 41s in a cross-sectional view as shown in FIG. The ratio (T1 / T2) to (T2) is preferably 1.1 or more, particularly 1.3 or more, from the viewpoint that the middle and high parts can adhere to the excretory part as closely as possible, and a feeling of strangeness when worn. From the viewpoint of making it difficult to give, it is preferably 4 or less, particularly 3 or less, and specifically, 1.1 or more and 4 or less, particularly 1.3 or more and 3 or less.
Further, from the viewpoint of preventing unexpected wrinkles and breaks in the napkin 1, the central portion 421 of the napkin 1 has the basis weights of the first region 41F and the second region 41R of the absorbent core 41 at least on the skin contact surface side. It has a form that does not have a recess with a lower basis weight than that. Here, the basis weight of the first region 41F and the second region 41R means the basis weight of the portion excluding the groove portion 45 when the first region 41F and the second region 41R have the groove portion 45.

Further, as shown in FIG. 2, one front-side convex portion 422 of the middle-high portion 42 is arranged at the front end portion of the middle-high central portion 421. In the napkin 1, the front convex portion 422 is arranged on the center line CL where the top portion 422t of the front convex portion 422 extends in the vertical direction X, and the side surfaces 422s and 422s forming the front convex portion 422 are arranged. Each extends linearly from the top 422t over the side edges 41s along the longitudinal direction X of the absorbent core 41.

Further, as shown in FIG. 2, one rear-side convex portion 423 of the middle-high portion 42 is arranged at the rear end portion of the middle-high central portion 421. Similar to the front convex portion 422, the rear convex portion 423 is arranged on the center line CL where the top portion 423t of the rear convex portion 423 extends in the vertical direction X, and both sides forming the rear convex portion 423. 423s and 423s each extend linearly from the top 423t to the side edges 41s along the longitudinal direction X of the absorbent core 41.

In the napkin 1, as shown in FIG. 2, when the absorbent core 41 is viewed in a plan view, the length of the front convex portion 422 gradually narrows in the lateral direction Y from the middle-high central portion 421 toward the first region 41F side. The length of the rear convex portion 423 is gradually narrowed in the lateral direction from the middle-high central portion 421 toward the second region 41R side. That is, the width d of the front convex portion 422 and the rear convex portion 423 of the absorbent core 41 toward the top portions 422t and 423t located in the central portion in the lateral direction Y from both side portions along the vertical direction X, respectively. Is formed to gradually decrease. Preferably, in the front convex portion 422 of the absorbent core 41 of the napkin 1, the distance (width d) between the side sides 422s and 422s is from the side edges 41s and 41s along the vertical direction X of the absorbent core 41 to the top 422t. It is gradually decreasing toward. Similarly, in the rear convex portion 423 of the absorbent core 41 of the napkin 1, the distance (width d) between the side sides 423s and 423s is from the side edges 41s and 41s along the vertical direction X of the absorbent core 41 to the top 423t. It is gradually decreasing toward. Here, the gradual decrease of the width d means that the width d is continuously and gradually decreased toward the tops 422t and 423t.

In the absorbent core 41 of the napkin 1, the front convex portion 422 of the front convex portion 422 and the rear convex portion 423 will be described as an example. ing. The angle α formed by the one side side 422s and the center line CL extending in the vertical direction X is preferably 20 ° or more, more preferably 30 from the viewpoint of fitting to the body shape and improving followability in movement. ° or more, and preferably 75 ° or less, more preferably 60 ° or less, specifically, preferably 20 ° or more and 75 ° or less, more preferably 30 ° or more and 60 ° or less. The rear convex portion 423 is also the same as the front convex portion 422.

The total length L2 of the middle and high portion 42 in the vertical direction X is preferably 25% or more, more preferably 30% or more, and preferably 90% or less, more preferably the total length L1 of the absorbent core 41 in the vertical direction X. Is 75% or less, preferably 25% or more and 90% or less, and more preferably 30% or more and 75% or less.
The total length L1 indicates the distance of the absorbent core 41 at the longest position in the vertical direction X, and the total length L2 means the distance of the middle and high portion 42 at the longest position in the vertical direction X.

The total length L3 of the middle-high central portion 421 constituting the middle-high portion 42 in the vertical direction X is preferably 20% or more, more preferably 30% or more, and preferably 90% or less, more than the total length L2 of the middle-high portion 42. It is preferably 80% or less, preferably 20% or more and 90% or less, and more preferably 30% or more and 80% or less.

The total length L4 of the front convex portion 422 constituting the middle-high portion 42 in the vertical direction X is preferably 5% or more, more preferably 10% or more, and preferably 50% or less of the total length L2 of the middle-high portion 42. , More preferably 30% or less, and preferably 5% or more and 50% or less, more preferably 10% or more and 30% or less. The vertical X total length of the rear convex portion 423 constituting the middle and high portion 42 is also the same as the total length L4 of the front convex portion 422 in the vertical direction X.
The total length L4 means the distance of the front convex portion 422 at the longest position in the vertical direction X.

In the napkin 1, as shown in FIG. 2, the absorbent core 41 is viewed in a plan view, and from the viewpoint of securing the absorbing surface of the excretion facing area B which is arranged to face the liquid excretion portion (vaginal opening or the like) of the wearer when worn. It is preferable that the surface area S1 of the middle-high central portion 421 is formed larger than the surface area S2 of the front convex portion 422 and the surface area S3 of the rear convex portion 423, respectively. Here, the surface area of each part means the area of the surface on the side facing the skin. The surface area S1 of the middle-high central portion 421 is preferably 100% of the surface area S2 of the front convex portion 422 or the surface area S3 of the rear convex portion 423 from the viewpoint of securing the absorption surface of the excretion facing area B of the absorbent core 41. (That is, 1 time) or more, more preferably 160% or more, preferably 3600% or less, more preferably 2000% or less, specifically, preferably 100% or more and 3600% or less, More preferably, it is 160% or more and 2000% or less.
Preferably, the surface area S1 of the middle-high central portion 421 is preferably 20 cm ² or more, more preferably 30 cm ² or more, preferably 200 cm ² or less, more preferably 150 cm ² or less, and specifically, preferably. 20 cm ² or more 200 cm ² or less, more preferably 30 cm ² or more 150 cm ² or less.
The surface area S2 of the front convex portion 422 or the surface area S3 of the rear convex portion 423 is preferably 5 cm ² or more, more preferably 10 m ² or more, and preferably 40 cm ² or less, more preferably 30 cm ² or less. Specifically, it is preferably 5 cm ² or more and 50 cm ² or less, and more preferably 10 cm ² or more and 40 cm ² or less.

In the napkin 1, as shown in FIG. 2, the absorbent core 41 has a middle-high boundary groove portion 43 for partitioning the boundary between the middle-high portion 42 and a portion other than the middle-high portion 42 in the intermediate region 41M. In the napkin 1, the middle-high boundary groove portion 43 forms a front middle-high boundary groove portion 43a extending along both side sides 422s and 422s forming the front side convex portion 422 constituting the middle-high portion 42, and a rear side convex portion 423. It has a rear middle-high boundary groove portion 43c extending along both side sides 423s and 423s. In the napkin 1, the front middle-high boundary groove portion 43a and the rear middle-high boundary groove portion 43c are arranged over the entire length (total width) of the absorbent core 41 in the lateral direction Y. Therefore, vertical wrinkles are less likely to occur in the vertical direction of the napkin 1 against the force acting inward in the width direction of the absorbent core 41 from the legs, and the napkin 1 can easily fit three-dimensionally along the shape of the body. Become. As described above, in the absorbent core 41, the boundary between the front middle-high boundary groove portion 43a and the rear middle-high boundary groove portion 43c divides the boundary between the middle-high portion 42 and the middle-high portion 42.

In the napkin 1, the groove width of the middle-high boundary groove portion 43 in the absorbent core 41 is preferably 0.1 mm or more, more preferably 0.5 mm or more, from the viewpoint of improving the absorbability of the liquid in the excretion facing area B. It is preferably 5.0 mm or less, more preferably 3.0 mm or less, and preferably 0.1 mm or more and 5.0 mm or less, more preferably 0.5 mm or more and 3.0 mm or less. is there. The groove width of the middle-high boundary groove 43 and the thickness described later are cut in a direction orthogonal to the extending direction of the middle-high boundary groove 43 and measured from a photograph of the cut end surface.
In the napkin 1, the thickness of the absorbent core 41 at the middle-high boundary groove 43 is preferably 0.08 mm or more, more preferably 0.15 mm or more, from the viewpoint of improving the absorbability of the liquid in the excretion facing area B. Also, preferably 7.0 mm or less, more preferably 3.5 mm or less, and preferably 0.08 mm or more, 7.0 mm or less, more preferably 0.15 mm or more and 3.5 mm or less. is there

In the napkin 1, the middle-high boundary groove portion 43 is formed to be lower than the basis weight of the middle-high portion 42, and further to be lower than the basis weight of the first region 41F and the second region 41R in the absorbent core 41. ing. Here, the basis weight of the first region 41F and the basis weight of the second region 41R mean the basis weight of the portion excluding the groove portion 45 when the groove portion 45 is provided. The basis weight of the middle-high boundary groove 43 is preferably 10 g / m ² or more, more preferably 20 g / m ² or more, and preferably 350 g / m ² or less, more preferably 250 g / m ² or less. Specifically, it is preferably 10 g / m ² or more and 350 g / m ² or less, and more preferably 20 g / m ² or more and 250 g / m ² or less. The basis weight of the middle-high boundary groove 43 is the mass of the sample cut out as described in the method for measuring the thickness of each part of the absorbent core 41 described above, and the mass of the sample is the skin-facing surface side of the sample. Divide by the area of the surface of.

As shown in FIG. 2, the middle-high portion 42 has a middle-high lateral groove portion 47 extending in the lateral direction Y on at least one of the front side convex portion 422 and the rear side convex portion 423 in a plan view of the absorbent core 41. However, the napkin 1 has a front middle-high lateral groove portion 47a on the front side convex portion 422 and a rear middle-high lateral groove portion 47c on the rear side convex portion 423. Here, as long as the middle-high lateral groove portion 47 extends in the lateral direction Y, it may extend in a continuous linear shape, may extend in a discontinuous linear shape arranged intermittently, or may extend in a curved shape. May be good. The front middle-high lateral groove portion 47a and the rear middle-high lateral groove portion 47c, which are the middle-high lateral groove portions 47 of the napkin 1, both extend in a continuous linear shape. Further, the fact that the middle-high lateral groove portion 47 extends in the lateral direction Y means that the angle formed by the bisector of the absorbent core 41 extending in the lateral direction Y extends within a range of less than 45 degrees. In the napkin 1, both the front middle-high lateral groove portion 47a and the rear middle-high lateral groove portion 47c extend parallel to the bisector.

In the napkin 1, it is preferable that one end of the middle-high lateral groove portion 47 is in contact with the middle-high boundary groove portion 43, but as shown in FIG. 2, both ends of the middle-high lateral groove portion 47 are in contact with different portions of the middle-high boundary groove portion 43. There is. Preferably, the front middle-high lateral groove portion 47a extends over both side sides 422s and 422s of the front side convex portion 422, and both ends of the front middle-high lateral groove portion 47a extend along both side sides 422s and 422s. It touches at a part different from 43a. Similarly, the rear middle-high lateral groove portion 47c extends over both side sides 423s and 423s of the rear side convex portion 423, and both ends of the rear middle-high lateral groove portion 47c extend along both side sides 423s and 423s. It touches in a different part from.

At least one middle-high lateral groove portion 47 may be arranged on one of the front side convex portion 422 and the rear side convex portion 423, but it is preferable that one or more and ten or less are arranged, and two or more 5 It is more preferable that the number is arranged below this level. In the napkin 1, two front middle-high lateral groove portions 47a are arranged on the front side convex portion 422, and each front middle-high lateral groove portion 47a extends in the lateral direction Y over both side sides 422s and 422s of the front side convex portion 422. It extends parallel to the bisector of the extending absorbent core 41. Further, two rear middle-high lateral groove portions 47c are arranged on the rear side convex portion 423, and each rear middle-high lateral groove portion 47c extends over both side sides 423s and 423s of the rear side convex portion 423 to the bisector. It extends in parallel.

In the napkin 1, the front middle-high lateral groove portion 47a is arranged on the front side convex portion 422, the rear middle-high lateral groove portion 47c is arranged on the rear side convex portion 423, and the front middle-high lateral groove portion 47a and the rear middle-high lateral groove portion 47c are arranged. The first lateral squeezing groove 71 of the anterior area A, one longitudinal squeezing groove 73, the first lateral squeezing groove 71 of the rear area C, and the other longitudinal squeezing groove 73 forming a ring-shaped all-around groove between the two. Is arranged with a pair of independent second vertical squeezing grooves 73A, 73A. When a plurality of front middle-high lateral groove portions 47a are arranged on the front side convex portion 422 and a plurality of rear middle-high lateral groove portions 47c are arranged on the rear side convex portion 423 as in the napkin 1, the napkin 1 It is preferable that a pair of second vertical squeezing grooves 73A and 73A are arranged between the front middle-high lateral groove portion 47a and the rear middle-high lateral groove portion 47c that are closest to the center line (not shown) extending in the lateral direction Y. .. When the pair of second longitudinal squeezing grooves 73A and 73A are arranged at such positions, they are less likely to be affected by the front middle-high lateral groove portion 47a and the rear middle-high lateral groove portion 47c in the middle-high portion 42, and are in the plane direction of the absorber 4. It is possible to suppress the diffusion of the body fluid of the napkin 1 and effectively prevent the liquid from leaking from the periphery of the napkin 1.

The napkin 1 is provided with a pair of wing portions 1W and 1W on both outer sides in the lateral direction Y. Then, in the napkin 1, the position of the front side virtual line ILA connecting the roots located on the front area A side of the pair of wing parts 1W and 1W coincides with the position of the front middle-high lateral groove portion 47a of the front side convex portion 422. The positions of the rear virtual line ILc connecting the roots located on the rear area C side of the pair of wing portions 1W and 1W coincide with the positions of the rear middle-high lateral groove portion 47c of the rear convex portion 423. When a plurality of front middle-high lateral groove portions 47a are arranged on the front side convex portion 422 as in the napkin 1, the position of one of the front middle-high lateral groove portions 47a is the front side virtual line ILa. It suffices if it matches the position. Similarly, when a plurality of rear middle-high lateral groove portions 47c are arranged on the rear side convex portion 423 as in the napkin 1, the position of one of the rear middle-high lateral groove portions 47c is the rear side virtual line ILc. It suffices if it matches the position of. In this way, if the position of the front side virtual line ILa and the position of the front middle-high lateral groove portion 47a match, and the position of the rear middle-high lateral groove portion 47c and the position of the rear side virtual line ILc match, when worn. The fit of the napkin 1 is improved.

In the napkin 1, the groove width of the middle-high lateral groove portion 47 in the middle-high portion 42 of the absorbent core 41 is the groove of the middle-high boundary groove portion 43 from the viewpoint of absorption of excrement, fit to the body, durability of the absorber, and the like. It is preferably the same as or narrower than the width, specifically, preferably 0.1 mm or more, more preferably 0.5 mm or more, and preferably 5.0 mm or less, more preferably 3.0 mm or less. It is preferably 0.1 mm or more and 5.0 mm or less, and more preferably 0.5 mm or more and 3.0 mm or less. The groove width of the middle-high horizontal groove portion 47 and the thickness described later are cut in a direction orthogonal to the extending direction of the middle-high horizontal groove portion 47 and measured from a photograph of the cut end surface.
In the napkin 1, the thickness of the middle-high lateral groove 47 in the middle-high portion 42 of the absorbent core 41 is preferably the same as or higher than the thickness of the middle-high boundary groove 43 from the viewpoint of the absorption performance of excrement liquid. It is preferably 0.08 mm or more, more preferably 0.15 mm or more, preferably 10.0 mm or less, more preferably 8.0 mm or less, and preferably 0.08 mm or more 10 It is 0.0 mm or less, more preferably 0.15 mm or more and 8.0 mm or less.

In the napkin 1, the basis weight of the middle-high lateral groove portion 47 in the middle-high portion 42 of the absorbent core 41 is preferably lower than the basis weight of the middle-high portion 42 from the viewpoint of fit to the body and absorption performance, and the groove portion 45. It is preferably higher than the basis weight. Specifically, the basis weight of the middle-high lateral groove 47 is preferably 10 g / m ² or more, more preferably 20 g / m ² or more, and preferably 800 g / m ² or less, more preferably 600 g / m ² or less. Specifically, it is preferably 10 g / m ² or more and 800 g / m ² or less, and more preferably 20 g / m ² or more and 600 g / m ² or less. The basis weight of the middle-high horizontal groove portion 47 is obtained by dividing the mass of the sample in the middle-high horizontal groove portion 47 cut out as described above by the area of the surface of the sample on the skin-facing surface side.

In the napkin 1, as shown in FIG. 2, the absorbent core 41 has a middle-high adjacent portion 44 in the region excluding the middle-high portion 42 in the intermediate region 41M and further, the middle-high boundary groove portion 43 is excluded. That is, in the napkin 1, the intermediate region 41M in the absorbent core 41 is composed of a middle-high portion 42, a middle-high boundary groove portion 43, and a middle-high adjacent portion 44. In the intermediate region 41M, the middle-high adjacent portion 44 includes a front middle-high adjacent portion 44a arranged on the first region 41F side adjacent to the front-side convex portion 422 constituting the middle-high portion 42, and a rear-side convex portion forming the middle-high portion 42. It has a rear middle-high adjacent portion 44c arranged on the second region 41R side adjacent to the portion 423. In the napkin 1, the front middle-high adjacent portion 44a is formed symmetrically with respect to the center line CL extending in the vertical direction X. In the front middle-high adjacent portion 44a, the half portion on the one side edge 41s side along the vertical direction X of the absorbent core 41 with respect to the center line CL has the length of the vertical direction X centered from the one side edge 41s. It is formed so as to gradually decrease toward the line CL. In the napkin 1, the rear middle-high adjacent portion 44c is also formed symmetrically with respect to the center line CL extending in the vertical direction X, similarly to the front middle-high adjacent portion 44a. In the rear middle-high adjacent portion 44c, the half portion on the one side edge 41s side along the vertical direction X of the absorbent core 41 with respect to the center line CL has the length of the vertical direction X centered from the one side edge 41s. It is formed so as to gradually decrease toward the line CL.

In the napkin 1, as shown in FIG. 3, the thickness of the middle-high adjacent portion 44 is larger than the thickness of the middle-high boundary groove portion 43 and the middle-high lateral groove portion 47, and is larger than the thickness of the middle-high portion 42 in the absorbent core 41. Is also formed small. Further, from the viewpoint of followability to the movement of the body, it is preferable that the thickness of the middle-high adjacent portion 44 is the same as or smaller than the thickness of the first region 41F and the thickness of the second region 41R. From the viewpoint of the strength of the absorbent core 41 when repeatedly deformed with respect to the movement of the body, the thickness of the middle-high adjacent portion 44 is larger than the thickness of the first region 41F and the thickness of the second region 41R. You may.
The thickness of the middle-high adjacent portion 44 is preferably 0.5 mm or more, more preferably 1.0 mm or more, preferably 10.0 mm or less, more preferably 7.0 mm or less, and preferably 0. It is 5 mm or more and 10.0 mm or less, more preferably 1.0 mm or more and 7.0 mm or less.
The thickness of the middle-high adjacent portion 44 is measured based on the method for measuring the thickness of each portion of the absorbent core 41 described above.

In the napkin 1, the basis weight of the middle-high adjacent portion 44 is smaller than the basis weight of the middle-high portion 42 of the absorbent core 41 and larger than the basis weight of the middle-high boundary groove portion 43 and the middle-high lateral groove portion 47. .. Furthermore, from the viewpoint of followability to the movement of the body, the basis weight of the middle-high adjacent portion 44 is the same as or smaller than the basis weight of the first region 41F and the second region 41R in the absorbent core 41. It is preferable that From the viewpoint of the strength of the absorbent core 41 when repeatedly deformed with respect to the movement of the body, the basis weight of the middle-high adjacent portion 44 is larger than the basis weight of the first region 41F and the second region 41R. May also be larger. Here, the basis weight of the first region 41F and the basis weight of the second region 41R mean the basis weight of the portion excluding the groove portion 45 when the groove portion 45 is provided. The basis weight of the middle-high adjacent portion 44 is preferably 20 g / m ² or more, more preferably 50 g / m ² or more, and preferably 800 g / m ² or less, more preferably 700 g / m ² or less. Specifically, it is preferably 20 g / m ² or more and 800 g / m ² or less, and more preferably 50 g / m ² or more and 700 g / m ² or less. The basis weight of the middle-high adjacent portion 44 is the mass of the sample of the middle-high adjacent portion 44 cut out as described in the method for measuring the thickness of each part of the absorbent core 41 described above, and the surface of the sample on the skin-facing surface side. Divide by the area of.

In the napkin 1, as shown in FIG. 2, the absorbent core 41 is viewed in a plan view, and the first region 41F and the second region 41R are divided into a groove portion 45 extending in the vertical direction X and a horizontal direction Y and a groove portion 45. A plurality of small absorption portions 46 formed by being formed are arranged. The basis weight of the small absorption portion 46 arranged in this way is higher than the basis weight of the groove portion 45. The groove portion 45 arranged in the first region 41F and the second region 41R includes a vertical groove 45X extending in the vertical direction X and a horizontal groove 45Y extending in the horizontal direction Y. The vertical grooves 45X extending in the vertical direction X are arranged at regular intervals in the horizontal direction Y, and the horizontal grooves 45Y extending in the horizontal direction Y are arranged at regular intervals in the vertical direction X. The small absorbing portion 46 is arranged at the position of the grid defined by the vertical groove 44Y and the horizontal groove 44X. The thickness and basis weight of the first region 41F and the second region 41R described above mean the thickness and basis weight of the small absorption portion 46.

The napkin 1 has a groove portion 45 and a small absorption portion 46 in the first region 41F and the second region 41R, and has a middle-high portion 42, a middle-high boundary groove portion 43, a middle-high lateral groove portion 47, and a middle-high adjacent portion 44 in the intermediate region 41M. The entire sex core 41 is integrally molded. "Integrally molded" is different from the one in which members manufactured in different processes are joined by a joining means such as adhesive or compression, and is integrally formed in one process using the same material. It means that it has been done.

As shown in FIG. 5A, the absorbent core 41 of the napkin 1 described above includes, for example, an accumulation recess 55 on the outer peripheral surface, a fiber stacking drum 54 that rotates in one direction R, and the fiber stacking drum 54. It can be manufactured by using a fiber stacking device provided with a duct (not shown) for supplying the core material in a scattered state on the outer peripheral surface of the above.
A plurality of accumulation recesses 55 are formed at regular intervals in the circumferential direction of the outer peripheral surface of the fiber stacking drum 54. The bottom surface 56 of the accumulation recess 55 is made of a mesh plate or the like, and has a large number of pores that function as suction holes.

Further, as shown in FIG. 5A, one recess 56b for forming the intermediate region 41M of the absorbent core 41 is formed in a part of the bottom surface 56 of one integration recess 55. .. Further, in the recess 56b, a first difficult-to-breathable member 57 for forming a middle-high boundary groove portion 43 that separates the middle-high portion 42 and the middle-high adjacent portion 44 is arranged on the bottom surface thereof to form the middle-high lateral groove portion 47. A third poorly breathable member 59 for this purpose is arranged. The first poorly breathable member 57 is arranged at a position corresponding to the middle-high boundary groove portion 43, and is fixed so as to project from the bottom surface of the recess 56b. The third poorly breathable member 59 is arranged at a position corresponding to the middle-high lateral groove portion 47, and is fixed so as to project from the bottom surface of the recess 56b. Further, a second poorly breathable member 58 for forming the groove 45 is arranged on the bottom surface 56 of the upstream side region and the downstream side region in the rotation direction R adjacent to the recess 56b. The second poorly breathable member 58 is arranged at a position corresponding to the vertical groove 44Y and the horizontal groove 44X, and is fixed so as to protrude from the bottom surface 56 of the integration recess 55. The first poorly breathable member 57, the second poorly breathable member 58, and the third poorly breathable member 59 may be non-breathable members, and are made of, for example, metal, plastic, or ceramic.

Similar to a known fiber stacking device equipped with a fiber stacking drum, the core material in which a water-absorbent polymer and pulp fibers are mixed is supplied into the duct while being sucked from the bottom surface of the accumulation recess 55. As shown in (b), the core material is deposited in a predetermined shape in the accumulation recess 55. By removing the deposit 40 from the accumulation recess 55, a precursor of the absorbent core 41 can be obtained. The precursor of the absorbent core 41 is covered with a core wrap sheet (not shown), cut by a rotary cutter or the like, and conveyed in the conveying direction by a conveying means such as a belt conveyor. In this way, the absorbent core 41 is obtained. The absorbent core 41 coated with the core wrap sheet (not shown) thus obtained is fully or partially pressurized and appropriately compressed by passing it once or multiple times between a pair of rolls. .. As a result, the portion deposited in the recess 56b becomes a middle-high portion 42 having a relatively large basis weight and thickness. Similarly, the portion made of the core material deposited in the upstream region and the downstream region adjacent to the recess 56b becomes the first region 41F and the second region 41R in the absorbent core 41 having a relatively small basis weight. Further, the portion made of the core material deposited on the first poorly breathable member 57 of the recess 56b becomes the middle-high boundary groove portion 43 which is relatively smaller than the basis weight of the first region 41F and the basis weight of the second region 41R. .. Further, the portion made of the core material deposited on the third poorly breathable member 59 of the recess 56b becomes the middle-high lateral groove portion 47 which is relatively smaller than the basis weight of the first region 41F and the basis weight of the second region 41R. .. The portion made of the core material deposited on the second poorly breathable member 58 in the upstream side region and the downstream side region adjacent to the recess 56b becomes the groove portion 45 which is relatively smaller than the basis weight of the small absorption portion 46.

The material for forming each component of the napkin 1 of the present embodiment described above will be described.
The skin-side sheet 2 forming the skin-facing surface has liquid permeability and is made of a material containing a thermoplastic synthetic resin. For example, a fibrous non-woven fabric such as an air-through fiber non-woven fabric, a spunbond non-woven fabric, or a point-bond non-woven fabric is suitable. Can be used for. Examples of the thermoplastic resin include, but are not limited to, olefin polymers such as ethylene and propylene, and polyethylene terephthalate. The skin side sheet 2 preferably has a basis weight of 10 to 100 g / m ² and a thickness of 0.5 to 5.0 mm, for example. Further, as the skin side sheet 2, the same sheet as that conventionally used in the technical field can be used without particular limitation, and a perforated film or the like can also be used.

The non-skin side sheet 3 has impermeable or impermeable properties and is made of a material containing a thermoplastic synthetic resin. For example, a synthetic resin film, a laminate of a synthetic resin film and a non-woven fabric, or a span. Water-repellent non-woven fabrics having high water pressure resistance such as bond-melt blown-spunbond laminated fiber non-woven fabric, air-through fiber non-woven fabric, point bond fiber non-woven fabric, and spunbond fiber non-woven fabric can be used, but are not limited thereto. The same ones conventionally used in the technical field can be used without particular limitation. The non-skin side sheet 3 preferably has a basis weight of 10 to 50 g / m ² and a thickness of 8 to 200 μm, for example.

The core material of the absorbent core 41 comprises a fiber aggregate made of a fiber material such as pulp fiber. As the fiber material, various materials conventionally used for absorbents of absorbent articles such as sanitary napkins, panty liners, and disposable diapers can be used without particular limitation. For example, pulp fiber, rayon fiber, and cotton can be used. Short fibers of cellulose-based fibers such as fibers and short fibers of synthetic fibers such as polyethylene are used. These fibers may be used alone or in combination of two or more. The fiber material is preferably pulp fiber in whole or in part, and the proportion of pulp fiber in the fiber material is preferably 50 to 100% by mass, more preferably 80 to 100% by mass. More preferably, it is 100% by mass.
Further, the absorbent core 41 may contain a water-absorbing polymer. Examples of the water-absorbent polymer include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, sodium polyacrylate crosslinked polymer, (dempun-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride). Examples thereof include a polymer and a saponified product thereof, and polyaspartic acid. By containing the water-absorbent polymer, it is possible to more stably quickly absorb and retain a large amount of excrement such as blood. In addition, a deodorant, an antibacterial agent, or the like may be added to the absorbent core 41 as needed.

Examples of the core wrap sheet (not shown) that covers the absorbent core 41 include tissue paper, a water-permeable non-woven fabric, and the like. The absorber 4 is formed by covering both the upper and lower surfaces of the absorbent core 41 with a core wrap sheet (not shown). The core wrap sheet (not shown) is used for the purpose of preventing leakage of the material forming the absorbent core 41 and improving the shape retention of the absorbent core 41. Between the core wrap sheet (not shown) that covers the skin-facing surface side of the absorbent core 41 and the skin-side sheet 2, and the core wrap sheet (not shown) that covers the non-skin-facing surface side of the absorbent core 41. It is preferable that the non-skin side sheet 3 is joined to each other by a pattern-coated adhesive such as dots, spirals, and stripes.

As the side sheet 5, various types conventionally used in the art can be used without particular limitation. For example, a liquid-impermeable or water-repellent resin film, a laminate of a resin film and a non-woven fabric, or the like can be used. Can be used. Examples of other materials include spunbonded non-woven fabrics, sheets in which a spunbonded non-woven fabric (S) and melt blown non-woven fabric (M) are composited (for example, SM, SMS, SMMS, etc.), heat roll non-woven fabrics, air-through non-woven fabrics, and the like. Examples include water-repellent (hydrophobic) non-woven fabrics.

The joint portion 6 for joining the side sheet 5 and the skin side sheet 2 can be formed by a heat sealing process according to a conventional method.
The linear squeezing groove 7 (first horizontal squeezing groove 71, second horizontal squeezing groove 72, vertical squeezing groove 73 and second vertical squeezing groove 73A) is squeezed with or without heat (so-called embossing) or. It can be formed according to a conventional method by embossing such as ultrasonic embossing.

The action and effect of the napkin 1 of the present embodiment described above will be described.
As shown in FIGS. 1 and 2, the napkin 1 has a thick and high basis weight middle-high portion 42 in the intermediate region 41M of the absorbent core 41, and the middle-high portion 42 has a middle-high portion 42 as shown in FIG. Looking at the absorbent core 41 in a plan view, the middle-high central portion 421 extending over the entire length in the horizontal direction Y and the front end of the middle-high central portion 421 that is convex toward the first region 41F side in the vertical direction X. It has a side convex portion 422 and a rear side convex portion 423 that is convex from the rear end portion of the middle and high central portion 421 in the vertical direction X toward the second region 41R side. Therefore, even if the napkin 1 which is an absorbent article is worn in a slightly displaced state, the absorption performance of the body fluid can be sufficiently exhibited. At least one of the front convex portion 422 and the rear convex portion 423 has a middle-high lateral groove portion 47. Therefore, the front convex portion 422 or the rear convex portion 423 having the middle-high lateral groove portion 47 is excellent in followability to the body shape, so that the wearer does not feel uncomfortable, and a gap is formed between the front convex portion 422 and the rear convex portion 423. It is unlikely to occur and sufficient absorption performance can be exhibited. As described above, even if the napkin 1 is worn in a slightly displaced state, it has an excellent fit to the body shape and can exhibit sufficient absorption performance.

Further, as shown in FIG. 2, the napkin 1 has a middle-high portion 42 and a middle-high boundary groove portion 43 having a low basis weight for partitioning a portion other than the middle-high portion 42 in the intermediate region 41M of the absorbent core 41. Then, one end of the middle-high lateral groove portion 47 is in contact with the middle-high boundary groove portion 43. Therefore, when the napkin 1 is worn, the front convex portion 422 or the rear convex portion 423 is easily bent due to the middle-high lateral groove portion 47, which is more excellent in following the body shape and between the napkin 1 and the wearer's skin. It is difficult for gaps to be formed in the skin, and sufficient absorption performance can be exhibited. In particular, in the napkin 1, the middle-high lateral groove portion 47 has a front middle-high lateral groove portion 47a in the front side convex portion 422 and a rear middle-high lateral groove portion 47c in the rear side convex portion 423. Therefore, when the napkin 1 is worn, the front convex portion 422 and the rear convex portion 423 are easily bent due to the middle-high lateral groove portion 47, and the followability to the body shape is further excellent, and sufficient absorption performance can be exhibited. .. Further, in the napkin 1, as shown in FIG. 2, the front middle-high lateral groove portion 47a extends over both side sides 422s and 422s of the front side convex portion 422, and both ends of the front middle-high lateral groove portion 47a are formed on both side sides 422s and 422s. It is in contact with the front middle-high boundary groove portion 43a extending along the line at a different portion. Similarly, the rear middle-high lateral groove portion 47c extends over both side sides 423s and 423s of the rear side convex portion 423, and both ends of the rear middle-high lateral groove portion 47c extend along both side sides 423s and 423s. It touches in a different part from. Therefore, when the napkin 1 is worn, the front convex portion 422 and the rear convex portion 423 are more easily bent due to the middle-high lateral groove portion 47, and the followability to the body shape is further excellent, and sufficient absorption performance is exhibited. it can.

Further, in the napkin 1, as shown in FIG. 2, the length of the front side convex portion 422 gradually narrows in the lateral direction Y from the middle-high central portion 421 toward the first region 41F side, and the rear side convex portion 422. In 423, the length in the lateral direction Y gradually narrows from the central portion 421 of the middle and high directions toward the second region 41R side. Therefore, when the napkin 1 is worn, the corresponding portions of the front convex portion 422 and the rear convex portion 423 of the middle and high portion 42 easily enter the gap, and the followability to the body shape is further excellent. Further, as shown in FIG. 2, since the napkin 1 has a groove portion 45 and a small absorption portion 46 in the first region 41F and the second region 41R of the absorbent core 41, the napkin 1 is bent starting from the groove portion 45. It is easy and less likely to give the wearer a sense of discomfort.

Further, as shown in FIG. 2, the napkin 1 is arranged in the intermediate region 41M of the absorbent core 41 on the side of the first region 41F adjacent to the front convex portion 422 constituting the mid-high portion 42. It has 44a and a rear middle-high adjacent portion 44c arranged on the second region 41R side adjacent to the rear-side convex portion 423 constituting the middle-high portion 42. The thickness of the middle-high adjacent portion 44 is smaller than the thickness of the first region 41F and the thickness of the second region 41R in the absorbent core 41, and is smaller than the thickness of the middle-high portion 42. Therefore, even if the napkin 1 is worn with a slight deviation, it is unlikely that a gap is formed between the napkin 1 and the wearer's skin, and sufficient absorption performance can be exhibited. In the napkin 1, the basis weight of the middle-high adjacent portion 44 is formed to be smaller than the basis weight of the first region 41F and the second region 41R of the absorbent core 41 and larger than the basis weight of the middle-high boundary groove portion 43. Therefore, among the above-mentioned effects, the effect of reducing the discomfort to the wearer can be further exerted.

In particular, when the napkin 1 is worn for a long period of time, the napkin 1 is repeatedly deformed due to the movement of the body, and the middle-high adjacent portion 44 may be damaged to impair the absorption performance. The thickness of the portion 44 may be larger than the thickness of the first region 41F and the second region 41R in the absorbent core 41.
Further, when the middle-high adjacent portion 44 is damaged due to repeated deformation due to the movement of the body and the absorption performance is impaired, the basis weight of the middle-high adjacent portion 44 is the first region 41F and the second in the absorbent core 41. It may be larger than the basis weight of the area 41R.

Although the present invention has been described above based on the preferred embodiment thereof, the absorbent article of the present invention is not limited to the napkin 1 of the present embodiment and can be appropriately modified.

For example, in the front convex portion 422 of the absorbent core 41 of the napkin 1, as shown in FIG. 2, the side edges 422s and 422s of the napkin 1 are not bent, respectively, from the side edge 41s along the vertical direction X of the absorbent core 41. It extends straight and linearly toward the top 422t, and the width d of the front convex portion 422 gradually decreases from the side edge 41s along the vertical direction X of the absorbent core 41 toward the top 422t. However, if the width d of the front convex portion 422 is simply gradually reduced, it may be gradually reduced. The front convex portion 422 extends straight and linearly, and the width d of the front convex portion 422 gradually decreases from both side edges 41s and 41s along the vertical direction X of the absorbent core 41 toward the top 422t. This is preferable because, in addition to improving the fit to the body, the mold releasability when the product is released from the accumulating recess 55 in the fiber stacking device is improved. The same applies to the rear convex portion 423.

Further, the first region 41F and the second region 41R of the napkin 1 have the same thickness, but may have different thicknesses as long as they are smaller than the thickness of the middle and high portions 42. Further, the first region 41F and the second region 41R of the napkin 1 have the same basis weight, but may have different basis weights as long as they are smaller than the basis weight of the middle and high portions 42. Further, the first region 41F and the second region 41R of the napkin 1 have a groove portion 45 and a small absorption portion 46, but may not have the groove portion 45 and the small absorption portion 46 having different shapes. You may be doing it.

Further, although the napkin 1 has a middle and high portion 42 in the excretion facing area B, it may extend from the excretion facing area B to a part of the front area A side or the rear area C side. For example, the anterior convex portion 422 extends from the middle-high central portion 421 of the excretion facing area B to the inside of the front area A, and the posterior convex portion 423 extends from the middle-high central portion 421 of the excretion facing area B to the rear area C. It may extend to. When the middle-high part 42 extends from the excretion facing area B to the front area A side or the rear area C side in this way, the middle-high part 42 is the outer peripheral area of the middle-high part 42 in the front area A or the rear area C. The thickness is thicker than the part.

Further, the absorbent core 41 of the napkin 1 is integrally molded as a whole, but may not be integrally molded. For example, in the absorbent core 41, the core material is formed at the same height from the first region 41F to the second region 41R, and then a material formed of another core material is arranged in the middle and high parts. 42 may be formed.

Further, as shown in FIG. 1, the napkin 1 has side seats 5 arranged on both sides of the skin side seat 2 on the skin facing surface along the vertical direction X, but the free ends of the side seats 5 are arranged. An elastic member in an extended state may be arranged in the vertical direction X to form a leak-proof cuff.

Further, the napkin 1 includes one of two folding curves (not shown) that cross the absorbent article in the lateral direction Y, which is generated when the absorbent article is folded into a tri-fold individual packaging form. It is preferable that the positions of the front middle-high lateral groove 47a of the front convex portion 422 coincide with each other in terms of storability during individual packaging, portability, and prevention of leakage from the fold line during use. It is preferable that the position of the second folding curve and the position of the rear middle-high lateral groove portion 47c of the rear side convex portion 423 coincide with each other, counting from the front end in the vertical direction X of the absorbent article.

Further, as shown in FIG. 2, two napkins 1 have the same number of front middle-high lateral groove portions 47a and rear middle-high lateral groove portions 47c arranged on the front side convex portion 422 or the rear side convex portion 423, but with different numbers. There may be.

Further, in the napkin 1 shown in FIG. 1, the linear squeezing groove 7 in which the skin side sheet 2 and the absorbent core 41 are squeezed and integrated is the first lateral squeezing groove 71 in the front area A as shown in FIG. , One longitudinal squeezing groove 73, the first lateral squeezing groove 71 in the rear area C, and the other longitudinal squeezing groove 73, and a pair of second omnidirectional grooves independent of the omnidirectional groove. The form has vertical pressing grooves 73A and 73A, but other forms may be used. For example, the linear squeezing groove 7 does not have a pair of second vertical squeezing grooves 73A, 73A, but has a first lateral squeezing groove 71 in the front area A, one vertical squeezing groove 73, and a first lateral squeezing groove 73 in the rear area C. It may have a form having only a ring-shaped all-around groove formed from the pressing groove 71 and the other vertical pressing groove 73.

Further, the absorbent core 41 of the napkin 1 is formed so that the groove portion 45 is recessed from the skin facing surface side toward the non-skin facing surface side, but the groove portion 45 is directed from the non-skin facing surface side to the skin facing surface side. It may be formed so as to be dented. This improves liquid diffusivity and liquid retention.

Further, in the napkin 1, the size of the front area A of the napkin 1 and the size of the first region 41F of the absorbent core 41 are substantially the same, but they do not have to be the same. Further, the size of the rear area C of the napkin 1 and the size of the second region 41R of the absorbent core 41 are substantially the same, but they do not have to be the same.

In addition to sanitary napkins, the absorbent article of the present invention may be a panty liner (pantyliner), an incontinence pad, or the like.

Hereinafter, the present invention will be further described with reference to Examples, but the present invention is not limited to these Examples.

[Example 1]
A sanitary napkin having the same basic configuration as the napkin 1 shown in FIGS. 1 and 2 was prepared. An air-through non-woven fabric with a basis weight of 30 g / m ² is used as the skin side sheet, a non-moisture permeable polyethylene film sheet with a ^{basis weight of 25 g / m 2} is used as the non-skin side sheet, and a basis weight ^{of 20 g / m 2} is repellent as the side sheet. A water-based spunbonded non-woven fabric was used. As the absorbent core, the one having the form shown in FIG. 2 was used. The absorbent core 41 was formed as a mixed product of pulp fibers and a water-absorbing polymer. The absorbent core 41 has a middle-high portion 42 in the intermediate region 41M, and the middle-high portion 42 has a front-side convex portion at the front-rear end portion of the middle-high central portion 421 and the middle-high central portion 421 over the entire width of the absorbent core 41. It has 422 and a rear convex portion 423. The thickness of the middle and high portion 42 was 7.0 mm, and the thickness of the first region 41F and the thickness of the second region 41R were 3.0 mm. The basis weight of the middle and high part 42 was 450 g / m ² , and the basis weight of the first region 41F and the basis weight of the second region 41R were 240 g / m ² . Further, the total length L2 of the middle and high portion 42 in the vertical direction X was 120 mm, and the total length L1 of the absorbent core 41 in the vertical direction X was 190 mm, which was 63% of that. Further, one middle-high lateral groove portion 47 was arranged in each of the front side convex portion 422 and the rear side convex portion 423. The middle-high lateral groove 47 is arranged over the entire width of the front convex portion 422 and the rear convex portion 423, the groove width is 2 mm, the thickness is 2 mm, and the basis weight is 100 g / m ^2. Met. The thickness and basis weight were measured by the method described above. Further, the maximum length of the absorbent core in the lateral direction Y was the same as the maximum length in the lateral direction Y of the central portion 421 of the middle and high heights.
The absorbent core of the above form was coated with tissue paper to form an absorbent body, sandwiched between the skin-side sheet and the non-skin-side sheet, and used as the napkin of Example 1. The absorbent body and the skin side sheet and the absorbent body and the non-skin side sheet were bonded via an adhesive.

[Comparative Example 1]
The napkin of Comparative Example 1 was prepared in the same manner as the napkin of Example 1 except that the sanitary napkin was produced using the absorbent core 41'in the form shown in FIG. In the absorbent core 41'in the form shown in FIG. 6, the middle and high portions 42'are not formed over the entire width of the absorbent core 41', as compared with the absorbent core in the form shown in FIG. It was arranged in the lateral center of the core 41'. Further, a groove portion extending in the vertical direction X and a horizontal direction Y was arranged in the middle and high portion 42', and a small absorption portion was arranged at the position of the grid defined by the groove portion. The basis weight of the small absorption portion of the middle-high portion 42'was 450 g / m ² , and the basis weight of the area around the middle-high portion 42'was 240 g / m ² .

[Evaluation]
After having the napkin of Example 1 and the napkin of Comparative Example 1 worn as usual by the following method, the absorption range, absorbability, and flexibility of each of the napkin of Example 1 and the napkin of Comparative Example 1 were obtained. The properties, liquid diffusivity, and lateral leakage were evaluated according to the following evaluation criteria.

-Evaluation criteria for absorption range: "A absorption range is sufficient", "B absorption range is slightly good", "C absorption range is slightly narrow", "D absorption range is narrow"
-Evaluation criteria for absorbency: "A Absorption is sufficient", "B Absorption is slightly good", "C Absorption is slightly uneasy", "D Absorption is uneasy"
-Evaluation criteria for flexibility and fit: "A Sufficient flexibility and excellent fit", "B Slightly flexible and good fit", "C Slightly hard and slightly poor fit", "D Hard and poor fit"
-Evaluation criteria for liquid diffusivity: "A liquid diffusivity is sufficient", "B liquid diffusivity is slightly good", "C liquid diffusivity is a little uneasy", "D liquid diffusibility is uncertain""

As is clear from the results shown in Table 1, it was found that the napkin of Example 1 had a sufficient absorption range and sufficient absorbability as compared with the napkin of Comparative Example 1. It was also found to be excellent in flexibility. Further, the napkin of Example 1 had good liquid diffusivity and did not cause lateral leakage. If such a napkin of Example 1 is used, even if it is worn in a slightly misaligned state, it is excellent in fitting to the body shape, so that it is difficult for the wearer to feel uncomfortable, and there is a gap between the napkin and the wearer's skin. It can be expected that sufficient absorption performance can be exhibited.

1 Sanitary napkin (absorbent article)
A Front area B Excretion facing area C Rear area 2 Skin side sheet 3 Non-skin side sheet 4 Absorber 41 Absorbent core 41F Absorbent core first area 41M Absorbent core intermediate area 41R Absorbent core second area 42 Middle-high part 421 Middle-high central part 422 Front-side convex part 423 Rear-side convex part 43 Middle-high boundary groove part 44 Middle-high adjacent part 45 Groove part 46 Small absorption part 47 Middle-high lateral groove part 47a Front middle-high lateral groove part 47c Rear middle-high lateral groove part 5 Side sheet 6 Joint 7 Linear squeezing groove

Claims (10)

An absorbent article having a vertically long absorbent core corresponding to the wearer's anterior-posterior direction and having an anterior and posterior area.
It said absorbent core, said an intermediate region between the second area located in the first region and the rear region side located in front zone side, the intermediate region, said first region and said It has a middle and high part that is thicker than the thickness in the two regions and has a basis weight higher than the basis weight in the first region and the second region.
The middle and high portions extend over the entire length in the horizontal direction orthogonal to the vertical direction of the absorbent core in a plan view of the absorbent core, and are longitudinally along both side edges along the vertical direction of the absorbent core. A middle-high central portion extending to a predetermined length, one front-side convex portion convex from the vertical front end portion of the middle-high central portion toward the first region side, and a vertical direction of the middle-high central portion. It has one rear-side convex portion that is convex from the rear end portion toward the second region side.
The middle-high portion has a middle-high lateral groove portion extending in the lateral direction at least one of the front-side convex portion and the rear-side convex portion in a plan view of the absorbent core .
The absorbent core is an absorbent article in which the maximum lateral length thereof is the same as the maximum lateral length of the central portion of the middle and high heights. The absorbent core has a middle-high boundary groove portion in the intermediate region that partitions a boundary between the middle-high portion and a portion other than the middle-high portion.
The middle-high boundary groove portion is formed to have a basis weight lower than the basis weight of the first region and the second region in the absorbent core.
The absorbent article according to claim 1, wherein one end of the middle-high lateral groove portion is in contact with the middle-high boundary groove portion. The middle-high boundary groove portion is arranged over the entire length of the absorbent core in the lateral direction.
The absorbent article according to claim 2 , wherein both ends of the middle-high lateral groove portion are in contact with different portions in the middle-high boundary groove portion. When the absorbent core is viewed in a plan view, the length of the front convex portion gradually decreases from the center of the middle height toward the first region side, and the convex portion of the rear side is the center of the middle height. The length in the lateral direction gradually narrows from the portion toward the second region side.
When the absorbent core is viewed in a plan view, a groove extending in the vertical direction and a horizontal direction and a plurality of small absorbing portions formed by being partitioned by the groove are arranged in the first region and the second region. The absorbent article according to any one of claims 1 to 3 , wherein the small absorbing portion has a basis weight higher than the basis weight of the groove portion. The aspect of any one of claims 1 to 4 , wherein the surface area of the middle-high central portion is larger than the surface area of the front convex portion and the surface area of the rear convex portion in a plan view of the absorbent core. Absorbent article. The middle and high lateral groove portions are arranged in the front side convex portion and the rear side convex portion, respectively.
The absorbent article comprises a skin-side sheet forming a skin-facing surface, a non-skin-side sheet forming a non-skin facing surface, and the absorbent core interposed between the two sheets.
The absorbent article comprises a linear squeeze groove in which the skin side sheet and the absorbent core are squeezed and integrated.
The linear squeezing groove has a pair of vertical squeezing grooves extending in the vertical direction of the absorbing core and a pair of second vertical squeezing grooves on the outer side of the pair of vertical squeezing grooves in the horizontal direction.
The second longitudinal squeezing groove is arranged between the middle-high lateral groove portion of the front-side convex portion and the middle-high lateral groove portion of the rear-side convex portion, according to any one of claims 1 to 5. Absorbent article. The middle and high lateral groove portions are arranged in the front side convex portion and the rear side convex portion, respectively.
A pair of wing portions are provided on both sides of the absorbent article along the vertical direction, and the position of the front side virtual line connecting the roots located on the front area side of the pair of wing portions and the position of the front side convex portion. The positions of the middle-high lateral groove portions are the same, and the positions of the rear side virtual lines connecting the roots located on the rear area side of the pair of wing portions and the positions of the middle-high lateral groove portions of the rear side convex portions. The absorbent article according to any one of claims 1 to 6, wherein the above is the same. An absorbent article having a vertically long absorbent core corresponding to the wearer's anterior-posterior direction and having an anterior and posterior area.
The absorbent core has an intermediate region between a first region located on the front area side and a second region located on the rear area side, and the intermediate region includes the first region and the second region. It has a middle and high part that is thicker than the thickness in the region and has a basis weight higher than the basis weight in the first region and the second region.
The middle and high portions extend over the entire length in the horizontal direction orthogonal to the vertical direction of the absorbent core in a plan view of the absorbent core, and are longitudinally along both side edges along the vertical direction of the absorbent core. A middle-high central portion extending to a predetermined length, one front-side convex portion convex from the vertical front end portion of the middle-high central portion toward the first region side, and a vertical direction of the middle-high central portion. It has one rear-side convex portion that is convex from the rear end portion toward the second region side.
The middle-high portion has a middle-high lateral groove portion extending in the lateral direction at least one of the front-side convex portion and the rear-side convex portion in a plan view of the absorbent core.
The absorbent core has a middle-high boundary groove portion in the intermediate region that partitions a boundary between the middle-high portion and a portion other than the middle-high portion.
The middle-high boundary groove portion is formed to have a basis weight lower than the basis weight of the first region and the second region in the absorbent core.
An absorbent article in which one end of the middle-high lateral groove portion is in contact with the middle-high boundary groove portion. An absorbent article having a vertically long absorbent core corresponding to the wearer's anterior-posterior direction and having an anterior and posterior area.
The absorbent core has an intermediate region between a first region located on the front area side and a second region located on the rear area side, and the intermediate region includes the first region and the second region. It has a middle and high part that is thicker than the thickness in the region and has a basis weight higher than the basis weight in the first region and the second region.
The middle and high portions extend over the entire length in the horizontal direction orthogonal to the vertical direction of the absorbent core in a plan view of the absorbent core, and are longitudinally along both side edges along the vertical direction of the absorbent core. A middle-high central portion extending to a predetermined length, one front-side convex portion convex from the vertical front end portion of the middle-high central portion toward the first region side, and a vertical direction of the middle-high central portion. It has one rear-side convex portion that is convex from the rear end portion toward the second region side.
The middle-high portion has a middle-high lateral groove portion extending in the lateral direction at least one of the front-side convex portion and the rear-side convex portion in a plan view of the absorbent core.
An absorbent article in which the surface area of the middle-high central portion is larger than the surface area of the front convex portion and the surface area of the rear convex portion in a plan view of the absorbent core. An absorbent article having a vertically long absorbent core corresponding to the wearer's anterior-posterior direction and having an anterior and posterior area.
The absorbent core has an intermediate region between a first region located on the front area side and a second region located on the rear area side, and the intermediate region includes the first region and the second region. It has a middle and high part that is thicker than the thickness in the region and has a basis weight higher than the basis weight in the first region and the second region.
The middle and high portions extend over the entire length in the horizontal direction orthogonal to the vertical direction of the absorbent core in a plan view of the absorbent core, and are longitudinally along both side edges along the vertical direction of the absorbent core. A middle-high central portion extending to a predetermined length, one front-side convex portion convex from the vertical front end portion of the middle-high central portion toward the first region side, and a vertical direction of the middle-high central portion. It has one rear-side convex portion that is convex from the rear end portion toward the second region side.
The middle-high portion has a middle-high lateral groove portion extending in the lateral direction at least one of the front-side convex portion and the rear-side convex portion in a plan view of the absorbent core.
The middle and high lateral groove portions are arranged in the front side convex portion and the rear side convex portion, respectively.
A pair of wing portions are provided on both sides of the absorbent article along the vertical direction, and the position of the front side virtual line connecting the roots located on the front area side of the pair of wing portions and the position of the front side convex portion. The positions of the middle-high lateral groove portions are the same, and the positions of the rear side virtual lines connecting the roots located on the rear area side of the pair of wing portions and the positions of the middle-high lateral groove portions of the rear-side convex portions. Consistent, absorbent article.

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