WO2023233775A1

WO2023233775A1 - Absorbent article

Info

Publication number: WO2023233775A1
Application number: PCT/JP2023/012128
Authority: WO
Inventors: 裕美竹澤
Original assignee: 大王製紙株式会社
Priority date: 2022-05-31
Filing date: 2023-03-27
Publication date: 2023-12-07
Also published as: JP2023176163A; TW202400100A

Abstract

The present invention includes an elongated body comprising: a skin-side top sheet; a back sheet on a non-skin side which is the side opposite the skin side; and an absorbent body disposed between the top sheet and the back sheet. A compressed groove which is recessed from the top sheet side toward the back sheet side is formed in at least the top sheet and the absorbent body. The compressed groove includes a first rear compressed groove that is formed in a region which faces the buttocks of a wearer when worn, and a second rear compressed grove that is formed separated from and to the rear of the first rear compressed groove. The first rear compressed groove has a first arc-shaped part that protrudes to the rear, a second arc-shaped part that is positioned on the front left of the first arc-shaped part and that protrudes to the rear left, and a third arc-shaped part that is positioned more to the front right than the first arc-shaped part and that protrudes to the rear right. The second rear compressed groove has a shape which protrudes to the rear.

Description

absorbent articles

The present invention relates to absorbent articles.

Conventionally, absorbent articles such as sanitary napkins have been known to have a structure in which the rear region of the main body is lengthened so that the absorbent articles can be used at night while sleeping or used for long periods of time. In such absorbent articles, various configurations for preventing leakage of body fluids in the rear region have been studied. Such studies include the shape of compressed grooves (embossed) formed in the top sheet and the absorbent body (for example, Patent Documents 1 and 2).

JP2009-100846A JP2014-223215A

However, with conventional configurations, when sleeping at night or when using an absorbent article for a long period of time, depending on the way it is worn and the wearer's movements while wearing it, body fluids may flow down the gluteal cleft or into the back of the gluteal cleft. There is still a concern that it may leak posterolaterally. Therefore, there is a need to improve the fit to the buttocks, particularly to the area near the end of the intergluteal cleft or the area behind it, and to prevent leakage.

In view of the above, an object of one embodiment of the present invention is to provide an absorbent article that has a high fit at the buttocks and can prevent the occurrence of leakage.

One aspect of the present invention is an elongated absorbent body comprising a skin-side top sheet, a non-skin side back sheet opposite to the skin side, and an absorbent body disposed between the top sheet and the back sheet. a main body, at least the top sheet and the absorbent body are formed with compression grooves recessed from the top sheet side to the back sheet side, and the area where the compression grooves face the buttocks of the wearer when worn; a first rear compression groove formed in the first rear compression groove, and a second rear compression groove formed behind the first rear compression groove and separated from the first rear compression groove, the first rear compression groove, a first arcuate portion that is convex to the rear; a second arcuate portion that is located to the left front of the first arcuate portion and is convex to the left rear; and a second arcuate portion that is located to the right front of the first arcuate portion and is convex to the right rear. and a third arcuate portion, and the second rear compression groove has a rearwardly convex shape.

According to one aspect of the present invention, it is possible to provide an absorbent article that has a high fit at the buttocks and can prevent the occurrence of leakage.

FIG. 1 is a plan view of the absorbent article according to the first embodiment of the present invention, viewed from the skin side. FIG. 2 is a sectional view taken along the line II in FIG. 1; 2 is a partially enlarged view of FIG. 1. FIG. FIG. 2 is a plan view of an absorbent article according to a second embodiment of the present invention, viewed from the skin side. 5 is a sectional view taken along the line II-II in FIG. 4. FIG. 5 is a partially enlarged view of FIG. 4. FIG.

Embodiments of the present invention will be described below with reference to the drawings. In each drawing, unless otherwise specified, the same or corresponding configurations may be denoted by the same reference numerals and the description thereof may be omitted.

[First embodiment]
<Basic structure of absorbent article>
The absorbent article according to this embodiment may be a sanitary napkin, a diaper, a pad for light incontinence, etc.; however, in the following, the basic structure of the absorbent article will be exemplified using a sanitary napkin for night use or for long periods of time. I will list and explain. FIG. 1 shows a plan view of an absorbent article 1 according to the first embodiment. Further, FIG. 2 shows a cross-sectional view taken along line II in FIG. 1.

As shown in FIGS. 1 and 2, the absorbent article 1 includes a liquid-permeable top sheet 3 placed on the side that faces the wearer's skin when worn, that is, the skin side, and a liquid-permeable top sheet 3 placed on the side opposite to the skin side. A liquid-impermeable back sheet 2 is provided on the non-skin side (underwear side). Furthermore, an absorbent core 4 is arranged between the backsheet 2 and the topsheet 3. The backsheet 2, absorbent body 4, and topsheet 3 are laminated to form a main body (absorbent article main body) 8. The absorbent core 4 is arranged so as not to protrude from the backsheet 2 and topsheet 3 in plan view. At both ends in the longitudinal direction D1, the edges of the backsheet 2 and the edges of the topsheet 3 may be joined by adhesive, heat sealing, or the like.

As shown in the figure, the absorbent article 1 has an elongated pad shape (a shape whose thickness is smaller than its width and length). In this specification, the longitudinal direction (front-back direction) of the absorbent article 1 is referred to as D1, and the lateral direction (left-right direction or width direction) perpendicular to the longitudinal direction D1 is referred to as D2. The longitudinal direction D1 is a direction corresponding to the front-back direction of the wearer's body when the absorbent article 1 is worn, and the lateral direction D2 is a direction corresponding to the left-right direction of the body.

In the form shown in FIGS. 1 and 2, the main body 8 has a shape in plan view that is approximately symmetrical with respect to a center line (longitudinal center line) CL extending in the longitudinal direction D1, but the shape of the main body 8 is It does not necessarily have to be line symmetric. In addition, configurations other than the shapes of the absorbent article 1 and main body 8 (thickness and density of the absorbent core 4, size and position of compressed grooves, shape and size of flaps extending outward from the main body 8 in the lateral direction D2, etc.) ) may be approximately symmetrical with respect to the center line CL as an axis of symmetry, or may be asymmetrical.

The back sheet 2 may be a sheet that has at least water-blocking properties, and may be, for example, a sheet made of olefin resin such as polyethylene or polypropylene. Further, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or a laminated sheet of a nonwoven fabric with a waterproof film interposed therebetween to ensure substantially liquid impermeability, etc. can be used. Furthermore, from the viewpoint of preventing stuffiness, it is more desirable to use a material having moisture permeability. Such water-impermeable and moisture-permeable sheet materials are made by melt-kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching the sheet in uniaxial or biaxial directions. A porous sheet or the like can be used. The backsheet 2 may be a sheet having the same external shape as the absorbent article 1.

The top sheet 3 can be a liquid-permeable sheet that quickly allows body fluids such as menstrual blood, vaginal discharge, and urine to pass through. As the top sheet 3, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like is suitably used. The material fibers constituting the nonwoven fabric include, for example, olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupro, blended fibers thereof, and natural fibers such as cotton, either singly or Two or more types can be used in combination. In addition, examples of processing methods for nonwoven fabrics include spunlace method, spunbond method, thermal bond method, melt blown method, needle punch method, and the like. Among these processing methods, the spunlace method is preferred because it can produce a nonwoven fabric with excellent flexibility, the spunbond method is preferred because it can produce a nonwoven fabric with excellent drapability, and the thermal bonding method is preferred because it can produce a bulky and soft nonwoven fabric. Further, composite fibers such as core-sheath type fibers, side-by-side type fibers, split type fibers, etc., which have a core of fibers with a high melting point and a sheath of fibers with a low melting point, can also be used.

The absorbent body 4 is not limited to any material as long as it can absorb and retain body fluids, but preferably contains cotton-like pulp and a water-absorbing polymer. As the water-absorbing polymer, superabsorbent polymer granules (SAP), superabsorbent fibers (SAF), and combinations thereof can be used. Examples of the pulp include chemical pulp obtained from wood, cellulose fibers such as dissolving pulp, and those made of artificial cellulose fibers such as rayon and acetate. As raw materials for chemical pulp, hardwoods, softwoods, etc. are used, and softwoods are preferably used because of their long fiber length.

Synthetic fibers may be mixed in the absorber 4. As synthetic fibers, polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used, and two of these may be used in combination. You can also do it. Composite fibers such as core-sheath type fibers, side-by-side type fibers, split type fibers, etc., which have a core of fibers with a high melting point and a sheath of fibers with a low melting point, can also be used. Note that it is also possible to use hydrophobic fibers whose surface is treated with a hydrophilizing agent to impart affinity for body fluids. The absorbent body 4 is preferably manufactured by a fiber stacking or air laying method.

The absorbent body 4 does not have to have a uniform basis weight over the entire surface, and the basis weight is increased in the center region of the absorbent body in the lateral direction D2, for example, in the range corresponding to the body fluid discharge port (blood drainage port) when worn. In other words, it may have a high basis weight portion 4H. The high basis weight portion 4H may bulge toward the skin side. Therefore, the absorber 4 does not need to have a uniform thickness over the entire surface. The thickness of the absorbent body 4 (length in the direction orthogonal to the longitudinal direction D1 and the lateral direction D2) may be 0.5 to 25 mm, preferably 1.5 to 15 mm.

The absorbent body 4 may be wrapped with an enveloping sheet made of colored or non-colored (white) crepe paper, nonwoven fabric, etc., in order to prevent twisting and cracking, or to prevent polymer particles from spilling.

On both sides of the absorbent article 1, that is, on the sides in the lateral direction D2,

side sheets

7, 7 are arranged on the skin side along the longitudinal direction D1. The side sheet 7 is constructed using a material that has been entirely or partially subjected to an appropriate water-repellent treatment or hydrophilic treatment, depending on the purpose of preventing the penetration of body fluids or enhancing the texture. It may be. It is preferable that the side sheet 7 is a nonwoven fabric containing natural fibers, synthetic fibers, recycled fibers, etc., or made of these fibers. When the side sheet 7 is a nonwoven fabric, it may be an air-through nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, etc., but from the viewpoint of being soft and resistant to creases and wrinkles, it can improve the feel to the touch. Preferably, it is an air-through nonwoven fabric. Note that the side sheet 7 may be water-repellent treated with a silicon-based, paraffin-based, or the like water repellent.

The side sheet 7 may be folded back on the inside in the lateral direction D2 to form a plurality of layers of band-shaped portions extending along the side of the main body 8. Gathers may be formed by arranging elastic elastic members in a stretched state along the longitudinal direction D1 between the plurality of layers. In this specification, the folding of the side sheet 7 and the structure of the gathers will not be explained, and will not be illustrated in the drawings.

The absorbent article 1 has a body fluid discharge port facing region C that faces the wearer's body fluid discharge port (vaginal opening in the illustrated example) when worn, and a body fluid discharge port facing region C that is adjacent to the front of the body fluid discharge port facing region C and that is adjacent to the front side of the body fluid discharge port facing region C and A front region F which is the region up to the front end, a perineum facing region (intermediate region) M adjacent to the rear of the body fluid outlet facing region C and facing near the wearer's perineum when worn, and a perineum facing region M The absorbent article may include a buttock-facing region B that is adjacent to the rear of the absorbent article and extends to the rear end of the absorbent article 1 and faces the buttock of the wearer when worn. Furthermore, the buttock-facing region B includes a front buttock-facing region B1 adjacent to the perineum-facing region, and a rear buttock-facing region B2 adjacent to the rear of the front buttock-facing region B1. The front buttock facing region B1 is a region that mainly faces the intergluteal cleft (buttock groove), and is a region that faces a region including the anus. The rear buttock-opposing region B2 is a region further back from the rear part of the gluteal cleft of the buttocks or the vicinity of the rear end of the gluteal cleft, particularly behind (or above if the person is standing up) the gluteal groove, which can be said to be the boundary between the buttocks and the legs. It may be an area that can face the part of the body. Note that the above description of the opposing relationship between the area of the main body 8 and the body of the wearer may be approximately the range when the wearer wears the absorbent article in a normal wearing manner while lying down. It is possible, but this is just a guideline.

The length in the longitudinal direction D1 of the body fluid outlet facing region C may be 50 to 120 mm, and the length in the longitudinal direction D1 of the buttocks facing region B may be 90 to 230 mm. Further, in the configuration according to the present embodiment, for example, the total length of the perineum facing region M and the buttock facing region B, preferably the length D1 in the longitudinal direction of the buttock facing region B, is set in the longitudinal direction in which the wing flap WF is provided. This is suitable for an absorbent article that is larger than the length D1 (the length from the front end to the rear end of the wing flap WF), that is, an absorbent article that has a long rear end. The length in the longitudinal direction D1 of the front buttock-facing region (gluteal cleft opposing region) B1 may be 40 to 100 mm, and the length in the longitudinal direction D1 of the rear buttock-facing region B2 may be 40 to 120 mm. Further, the total length of the absorbent article 1 in the longitudinal direction D1 may be 250 to 450 mm.

The absorbent article 1 may include a pair of wing flaps WF, WF extending outward in the lateral direction D2 from both sides of the body fluid outlet facing region C, respectively. An anti-slip material (not shown) may be provided on the non-skin side of the wing flaps WF, WF, and this anti-slip material allows the wing flaps WF, WF and the main body 8 to sandwich the underwear when worn. Wing flaps WF and WF can be folded back to the non-skin side and attached to underwear. Thereby, the absorbent article 1 can be securely fixed to the underwear. The wing flaps WF, WF are formed by joining the outwardly extending portions of the

side sheets

7, 7 in the lateral direction D2 and the outwardly extending portions of the backsheet 2 in the lateral direction D2.

Additionally, a pair of hip hold flaps HF, HF may be formed extending from the side of the main body 8 outward in the lateral direction D2 from the perineum facing region M to the buttock facing region B. The hip hold flaps HF, HF prevent the leakage of body fluids at the rear of the absorbent article 1, and by increasing the contact area with the buttocks, the entire absorbent article 1 is held against the underwear, especially in the lateral direction D2. It also has the function of making it difficult to shift and stabilizing the mounting position of the absorbent article 1. The hip hold flaps HF, HF may also be formed by joining the outwardly extending portions of the

side sheets

<Compression groove>
As shown in FIGS. 1 and 2, a plurality of compressed grooves (embossed) are formed in the main body 8 of the absorbent article 1 of this embodiment (in the example of FIG. 1,

symbols

10, 11, 12, 13 (illustrated). The compressed grooves may be formed symmetrically with respect to the longitudinal center line CL of the absorbent article 1 in plan view, but do not necessarily have to be symmetrically formed. The compressed groove is formed as a groove that is depressed from the top sheet 3 side to the back sheet 2 side. The compressed grooves can be formed, for example, by passing a laminate in which at least the top sheet 3 and the absorbent core 4 are laminated between a pair of pressure rolls. In that case, a roll having a convex portion corresponding to the compression groove on the surface is placed on the top sheet 3 side of the laminate, and a roll with a smooth surface is placed on the absorbent body 4 side. Pressure can be applied by pinching. Note that the compression groove may include a low compression section and a high compression section that is compressed at a higher pressure within the low compression section. In the drawings, the high compression area is shown in black.

In the form shown in FIG. 1, a pair of

central compression grooves

10, 10 extend along the longitudinal direction D1, mainly from the region C facing the body fluid outlet to the region M facing the perineum. The pair of central

compressed grooves

10, 10 are formed on both sides of the longitudinal center line CL so as to be spaced apart from each other. The pair of central

compressed grooves

10, 10 are arranged so as not to overlap with the high basis weight portion 4H. The distance between the pair of central

compressed grooves

10, 10 in the lateral direction D2 may be constant or may vary. For example, as shown in FIG. 1, it may become smaller near the boundary between the body fluid outlet facing region C and the perineum facing region M, become larger again behind it, and become smaller toward the rear end.

A first rear compressed groove 11 is formed at the rear of the pair of central

compressed grooves

10, 10 and spaced apart from the pair of central

compressed grooves

10, 10. It is preferable that the first rear compression groove 11 is formed in the buttock facing region B, mainly in the intergluteal cleft facing region B1. The first rear compression groove 11 has a rearwardly convex shape as a whole, and more specifically has at least three rearwardly convex portions (a first arcuate portion 11C, a second arcuate portion 11L, and a third arcuate portion 11R). Furthermore, a second rear compressed groove 12 is formed at the rear of the first rear compressed groove 11 and spaced apart from the first rear compressed groove 11 . The second rear compression groove 12 is a groove extending along the lateral direction D2, and has a rearwardly convex shape.

Further, a front pressing groove 13 is formed in front of the pair of central

pressing grooves

10, 10. In the example shown in FIG. 1, the front compressed groove 13 has a closed shape formed by combining compressed grooves that are convexly curved forward with different radii of curvature.

FIG. 3 shows an enlarged view of the portion from the rear portion of the pair of

central compression grooves

10, 10 to the second rear compression groove 12. As shown in FIG. 3, the first rear compressed groove 11 includes a rearwardly convex first arcuate portion 11C located so as to overlap the longitudinal center line CL, and a rearwardly adjacent first arcuate portion 11C to the left of the first arcuate portion 11C. It includes a second arcuate portion 11L that is convex (convex toward the rear left) and a third arcuate portion 11R that is convex toward the rear (convexes toward the rear right) adjacent to the right of the first arcuate portion 11C. The second arcuate portion 11L and the third arcuate portion 11R are both located in front of the first arcuate portion 11C and on the outside in the lateral direction D2. More specifically, as shown in FIG. 3, the second arcuate portion 11L is located to the left front of the first arcuate portion 11C, and the third arcuate portion 11R is located to the right front of the first arcuate portion 11C. . It is preferable that the first arcuate portion 11C and the second arcuate portion 11L and the first arcuate portion 11C and the third arcuate portion 11R be connected. Note that a shape that is convex toward the left rear means that the normal line drawn at the apex of the arc-shaped portion forms an angle of less than 60° with respect to the longitudinal center line CL, and the further toward the rear, the more leftward from the longitudinal center line CL. refers to leaving. In addition, a shape that is convex toward the right rear means that the normal line drawn at the apex of the arc-shaped portion makes an angle of less than 60° with respect to the longitudinal center line CL, and the further toward the rear, the more rightward from the longitudinal center line CL. refers to leaving.

With the configuration of the first rear compressed groove 11 and the second rear compressed groove 12 as described above, a plurality of bending base points can be formed from the front to the rear. That is, from the front toward the rear, the second arcuate portion 11L, the third arcuate portion 11R, the first arcuate portion 11C, and the second rear compression groove 12 are easy to bend in three stages in the longitudinal direction D1. Therefore, the entire rear of the buttock-facing region B can be curved toward the skin side (so as to be convex toward the non-skin side) when viewed in cross section along the longitudinal direction D1. Further, from left to right, the second arcuate portion 11L, the first arcuate portion 11C, the second rear compression groove 12, and the third arcuate portion 11R are easily bent in three stages in the lateral direction D2. Therefore, the rear of the buttock-facing region B can be curved toward the skin side (so as to be convex toward the non-skin side) when viewed in a cross section along the lateral direction D2. In this way, according to this embodiment, the buttock facing region B can be easily bent in both the longitudinal direction D1 and the lateral direction D2, and a three-dimensional curve along the roundness of the buttock can be easily formed. Therefore, the main body 8 can be brought into good contact with the region where the curve of the buttocks becomes sharp from near the rear end of the intergluteal cleft to further behind the intergluteal cleft.

To explain the above configuration in more detail, as shown in FIG. The apex 11Rt of the portion 11R is located forward of the apex 11Ct of the first arcuate portion 11C and on the outer side in the lateral direction D2. Further, the apex 12t of the second rear compression groove 12 is located behind the apex 11Ct of the first arcuate portion 11C of the first rear compression groove 11. Note that in this specification, the apex 11Ct of the first arcuate portion 11C may be located at either of both edges of the first arcuate portion 11C or at the rearmost position of the center line. Moreover, the apex 12t of the second rear compressed groove 12 can also be located at either of the both edges of the second rear compressed groove 12 or at the rearmost position of the center line. The apex 11Lt of the second arcuate portion 11L and the apex 11Rt of the third arcuate portion 11R may each be a position where the radius of curvature is the minimum on any edge or center line of the arcuate portion. In the example shown in FIG. 3, the apex 11Ct of the first arcuate portion 11C is located at the rearmost position of the rear edge of the first arcuate portion 11C, and the apex 12t of the second rear compression groove 12 is located in the second rear compression groove. in the rearmost position of the rear edge of Further, the apex 11Lt of the second arcuate portion 11L may be a position where the radius of curvature is the minimum at the rear edge of the second arcuate portion 11L, and the apex 11Rt of the third arcuate portion 11R may be the position where the radius of curvature is the minimum at the rear edge of the second arcuate portion 11L. The radius of curvature may be at its minimum at the rear edge.

As described above, when the main body 8 is three-dimensionally curved along the roundness of the buttock when worn, the adhesion to the entire buttock increases, but the center of the buttock facing region B, that is, the longitudinal direction D1 of the buttock facing region B In the vicinity of the center and in the vicinity of the lateral direction D2, the degree of curvature convex toward the non-skin side may become too large, and in that case, the close contact with the buttocks may be impaired. On the other hand, in this embodiment, as shown in FIG. 3, the first rear compressed groove 11 and the second rear compressed groove 12 are separated from each other in the longitudinal direction D1. Thereby, a flexibly deformable region without a compression groove can be formed between the first rear compression groove 11 and the second rear compression groove 12. If the region between the first rear compressed groove 11 and the second rear compressed groove 12 is flexible, the region receives a compressive force when worn, and is particularly compressed from the first rear compressed groove 11 and from the second rear compressed groove. 12 in the longitudinal direction D1, it can be deformed so as to bulge toward the skin. This bulge can be made to face the rear part of the wearer's buttocks, especially the part where the gluteal cleft near the end of the gluteal cleft is shallow, or the part further back from the end of the gluteal cleft. Even if body fluids migrate backwards through the fissure, leakage of body fluids can be prevented.

Furthermore, it is preferable that the apex 11Ct of the first arcuate portion 11C of the first rear compression groove 11 and the front ends 12ft, 12ft of the second rear compression groove 12 are separated from each other in the longitudinal direction D1. Thereby, the above-mentioned flexible region between the first rear compressed groove 11 and the second rear compressed groove 12 can be prevented from being entirely surrounded by the compressed groove and having its flexibility reduced.

Note that the separation distance in the longitudinal direction D1 between the first rear compression groove 11 and the second rear compression groove 12, that is, the distance between the apex 11Ct of the first arcuate portion 11C of the first rear compression groove 11 and the second rear compression groove 12 The separation distance d ₁ from the front ends 12 ft and 12 ft is preferably 5 to 20 mm. By setting the separation distance _d1 within this range, the first rear compressed groove 11 and the second rear compressed groove 12 are prevented from becoming too close to each other, and the rigidity of the area between the two compressed grooves is prevented from becoming unnecessarily high. The region between both compression grooves can be appropriately compressed and bulge toward the skin side.

Further, the separation distance d ₂ between the first rear compressed groove 11 and the second rear compressed groove 12 on the longitudinal center line CL is preferably 15 to 40 mm. By setting the separation distance _d2 within this range, when the buttock facing region B is curved when worn, the region between the first rear compression groove 11 and the second rear compression groove 12 receives compressive force and the skin It can be appropriately raised on the sides, and can prevent it from becoming hard, absorbing body fluids, and reducing the feeling of wearing.

In addition, in the first rear compression groove 11, the portions of the second arcuate portion 11L and the third arcuate portion 11R on the outer side in the lateral direction D2 each extend forward largely along the longitudinal direction D1. As a result, the second arcuate portion 11L and the third arcuate portion 11R have the function of preventing body fluid from leaking laterally (outward in the lateral direction D2). Since the second arcuate portion 11L and the third arcuate portion 11R extend relatively long in the longitudinal direction D1, the first rear compressed groove 11 as a whole is relatively wide in both the longitudinal direction D1 and the lateral direction D2. It has an elongated shape. Note that the ratio (a/b) of the extension length a in the lateral direction D2 to the extension length b in the longitudinal direction D1 may be about 0.8 to 1.2.

In the first rear compression groove 11, there are connections between the arcuate parts, that is, between the first arcuate part 11C and the second arcuate part 11L, and between the first arcuate part 11C and the third arcuate part 11R.

Portions

11r and 11r are formed. These connecting

parts

11r, 11r are located between the first arcuate part 11C and the second arcuate part 11L, and the first It can be said that this is a part formed between the arcuate part 11C and the third arcuate part 11R, and is recessed forward and in a direction approaching the longitudinal center line CL. When worn, the connecting

portions

11r, 11r can also serve as bending points, making it easier to bend the main body 8 more smoothly and naturally along the shape of the buttocks, further improving the adhesion to the buttocks. The connecting

portions

11r, 11r may have a smoothly curved shape such that the tangent line of the groove changes continuously, and in that case, the second arcuate portion 11L, the first arcuate portion 11C, and the third arcuate portion 11R. The whole thing becomes a waveform. Alternatively, as shown in FIG. 3, the connecting

portions

11r, 11r may include a portion where the tangent to the groove changes discontinuously. As a result, the connecting

portions

11r, 11r have sharp recessed portions (i.e., sharp recesses) at the boundaries between the first arcuate portion 11C and the second arcuate portion 11L, and the boundaries between the first arcuate portion 11C and the third arcuate portion 11R. 1), the connecting

portions

11r, 11r can be bent more easily, and the effect of improving adhesion can be further enhanced. Note that in this specification, the tangent to a groove may be a tangent drawn at either of the edges of the groove or at the center line.

[Second embodiment]
FIG. 4 shows a plan view of an absorbent article 1A according to a second embodiment of the present invention, viewed from the skin side. Further, FIG. 5 shows a sectional view taken along the line II-II in FIG. 4. Further, FIG. 6 shows a partially enlarged view of FIG. 4. The basic structure of the absorbent article 1A according to the second embodiment is also the same as that of the first embodiment (FIGS. 1 to 3), but the shape of the first rear compression groove 11 is different from that of the first embodiment. There is. More specifically, as shown in FIGS. 4 and 6, in the absorbent article 1A according to the second embodiment of the present invention, the first arcuate portion 11C of the first rear compressed groove 11 has a pair of extensions in the front. It has sections 11ex and 11ex. In the absorbent article 1A according to the second embodiment, the same effects as in the first embodiment can be obtained, but in this embodiment, further effects can be obtained by the pair of extension parts 11ex, 11ex.

As shown in FIG. 6, the pair of extension portions 11ex, 11ex of the first arcuate portion 11C are portions extending from the front of the first arcuate portion 11C. Since the first arcuate portion 11C is inclined so that it approaches the longitudinal center line CL as it goes forward, the pair of extension parts 11ex, 11ex also incline so that it approaches the longitudinal center line CL as it goes forward. ing. That is, the distance between the parts divided on both sides of the longitudinal center line CL of the first arcuate part 11C becomes smaller toward the front.

By forming the extension parts 11ex, 11ex, when worn, the extension parts 11ex, 11ex serve as bending points, and both sides of the line along the extension parts 11ex, 11ex can be deformed so as to approach the skin side. Thereby, the connecting

parts

11r, 11r can be bent more easily, a natural curve along the buttocks can be obtained, and the adhesion can be improved.

In addition, the presence of the extension parts 11ex, 11ex also increases the rigidity of the region 30 surrounded by the extension part 11ex of the first arc part 11C and the second arc part 11L on both sides of the first arc part 11C, as well as the rigidity of the first arc part 11C. The rigidity of the region 30' surrounded by the extension part 11ex of the part 11C and the third arcuate part 11R can be made slightly higher (the regions 30 and 30' are shown with diagonal lines in FIG. 6). The regions 30, 30' are regions facing on both sides near the rear part or rear end of the wearer's intergluteal cleft when worn. When wearing the wearer, the wearer often deforms the center of the intergluteal cleft opposing region B1 in the lateral direction D2 so as to enter the intergluteal cleft. Folds and wrinkles may occur. However, the area 30 is partially surrounded by the extension part 11ex of the first arcuate part 11C and the second arcuate part 11L, and the area 30' is partially surrounded by the extension part 11ex of the first arcuate part 11C and the third arcuate part 11R. By being partially surrounded by the gluteal cleft, it is possible to prevent the above-mentioned twisting and the like, and it is possible to bring the main body 8 into contact with the surfaces of the buttocks on both sides of the intergluteal cleft, thereby improving the fit. Thereby, even if the body fluid that has passed through the intergluteal cleft moves further outward in the lateral direction D2, leakage can be prevented.

In order to further enhance the effect of preventing twisting in the rigidity of the regions 30, 30', a plurality of compressed grooves may be formed in the absorbent body 4 in the regions 30, 30' in a spaced manner. The form (shape, size, formation method) of the compressed portion formed in the absorbent body 4 should be such that it can prevent the regions 30, 30' from twisting and ensure flexibility to conform to the surface of the buttocks. Not particularly limited.

Furthermore, as shown in FIG. 6, it is preferable that virtual lines Y and Y' drawn along the extension parts 11ex and 11ex pass through the front ends 12ft and 12ft of the second rear compression groove 12, respectively. The imaginary line drawn along the extension part 11ex may be an imaginary line drawn from the front end to the rear end of the extension part 11ex without protruding from the extension part 11ex. In the illustrated example, the virtual lines Y and Y' extend so that the distance between them increases toward the rear.

The above configuration allows the main body 8 to be easily bent along a line extending in the extending direction of the extension part 11ex and extending from the front end of the extension part 11ex to the front end 12ft of the second rear compression groove 12. In other words, bending about the imaginary lines Y and Y' is more likely to occur. As a result, the area between the first rear compression groove 11 and the second rear compression groove 12 (the area surrounded by the first rear compression groove 11, the second rear compression groove 12, and the virtual lines Y and Y') In this case, no base point of bending is formed, and the curvature of the region can be made relatively small. Here, as described above, the area between the first rear compressed groove 11 and the second rear compressed groove 12 is a region near the end of the wearer's intergluteal cleft or a region further behind the end of the intergluteal cleft. This will be the area to face. Therefore, the area between the first rear compressed groove 11 and the second rear compressed groove 12 can be brought into close contact with the area where the intergluteal cleft is shallow or where there is no intergluteal cleft, thereby preventing body fluids from flowing backward. Even if leakage occurs, such leakage can be prevented.

Although the present invention has been described above based on the embodiments, the present invention is not limited to these embodiments. Further, the above-described embodiments may be subjected to various changes, modifications, substitutions, additions, deletions, combinations, etc. within the scope of the claims, and these also belong to the technical scope of the present invention.

Further, specific embodiments of the present invention will be described below.

(Additional note 1)
The embodiment according to appendix 1 is an elongated absorbent body comprising a skin-side top sheet, a non-skin-side back sheet opposite to the skin side, and an absorbent body disposed between the top sheet and the back sheet. a main body, at least the top sheet and the absorbent body are formed with compression grooves recessed from the top sheet side to the back sheet side, and the area where the compression grooves face the buttocks of the wearer when worn; a first rear compression groove formed in the first rear compression groove, and a second rear compression groove formed behind the first rear compression groove and separated from the first rear compression groove, the first rear compression groove, a first arcuate portion that is convex to the rear; a second arcuate portion that is located to the left front of the first arcuate portion and is convex to the left rear; and a second arcuate portion that is located to the right front of the first arcuate portion and is convex to the right rear. and a third arcuate portion, and the second rear compression groove has a rearwardly convex shape.

The above-mentioned shapes of the first rear compression groove and the second rear compression groove in the aspect according to Supplementary Note 1 above determine the apex of the first arcuate part, the apex of the second arcuate part, and the apex of the third arcuate part of the first rear compression groove. , and the apex of the second rear compressed groove serve as a location (bending base point) that can be easily bent in the longitudinal direction. Therefore, when viewed in the longitudinal direction, from the front to the rear, there are at least three stages at the apex of the second arcuate part, the apex of the third arcuate part, the apex of the first arcuate part, and the apex of the second rear compression groove. It is easier to bend. Thereby, the main body can be curved in the longitudinal direction toward the skin and easily adapted to the shape of the rear part of the buttocks. Moreover, when viewed in the lateral direction, it becomes easier to bend in at least three stages at the apex of the second arcuate portion, the apex of the first arcuate portion, the apex of the second rear compression groove, and the apex of the third arcuate portion. Thereby, the main body can be curved laterally toward the skin and easily adapted to the shape of the rear part of the buttocks. Thus, according to this aspect, the region facing the buttocks can be easily bent both in the longitudinal direction and in the lateral direction, and a three-dimensional curve can be easily formed. Thereby, the rear region of the absorbent article can be brought into close contact along the roundness of the buttocks, especially the rear portion. This can prevent bodily fluids from leaking to the rear or rear side of the buttocks.

Furthermore, in this aspect, since the first rear compression groove and the second rear compression groove are separated from each other, it is possible to create a flexibly deformable region without a compression part between the two compression grooves. Therefore, when the main body is bent toward the skin side along the first rear compression groove and the second rear compression groove, the area between the two compression grooves may bulge toward the skin side due to compressive force. This bulge increases the adhesion to the rear part of the wearer's buttocks, that is, the part where the gluteal cleft near the end of the gluteal cleft is shallow, or to the part further back from the end of the gluteal cleft, thereby preventing leakage. It can be prevented.

(Additional note 2)
In the aspect according to Supplementary Note 2, the front tip of the second rear compression groove is located rearward from the top of the first arcuate portion of the first rear compression groove.

According to the aspect according to Supplementary Note 2 above, since the first rear compressed groove and the second rear compressed groove do not overlap when viewed in the longitudinal direction, it is possible to reduce the possibility that the flexibility between both compressed grooves will decrease. As a result, when compressive force is applied to the area between both compression grooves when the main body is bent, this area can be raised toward the skin side, achieving the above-mentioned effect of increasing the adhesion to the rear part of the buttocks. Further improvement.

(Additional note 3)
In the aspect according to Supplementary Note 3, the slope of the tangent changes discontinuously at the connecting portion between the first arcuate portion and the second arcuate portion and the connecting portion between the first arcuate portion and the third arcuate portion. Includes parts where

According to the aspect according to Supplementary Note 3 above, in the first rear compression groove, relatively sharp depressions extending forward as viewed from the rear of the first rear compression groove are formed at at least two locations on both sides of the first arcuate portion. This means that Therefore, since the positions of these depressions can also serve as bending points, the main body can be bent more easily, and a more natural curvature that follows the shape of the buttocks can be obtained.

(Additional note 4)
In the aspect according to Appendix 4, the first arcuate portion has a pair of extension portions that extend the arc of the first arcuate portion forward.

According to the aspect according to Supplementary Note 4 above, the main body can be easily bent along the extending direction of the pair of extension parts. Additionally, since the region surrounded by the left extension and the second arcuate portion and the region surrounded by the right extension and the third arcuate portion have slightly higher rigidity, unnecessary twisting in these regions is avoided. and wrinkles are less likely to occur. This area corresponds to the rear part of the wearer's intergluteal cleft or both sides near the end of the intergluteal cleft when worn, so by making it difficult for twisting to occur in these areas, It can be placed closely along the gentle sides of the buttocks on both sides of the cleft. Therefore, leakage of body fluids that have passed along the gluteal cleft can be prevented.

(Appendix 5)
In the aspect according to appendix 5, the pair of extensions are each inclined so as to approach the center in the lateral direction as it goes forward, and the imaginary lines drawn along the pair of extensions are respectively the second rear compressor. Pass through the front edge of the groove.

According to the aspect according to Supplementary Note 5 above, bending is likely to occur around a line that extends along the extension portion of the first rear compressed groove and to the position of the front end of the second rear compressed groove. Therefore, the formation of a natural curve that follows the shape of the buttocks is further facilitated, and the adhesion to the buttocks can be further improved.

This application claims priority based on Japanese Patent Application No. 2022-088307 filed on May 31, 2022, and its entire contents are incorporated herein.

1, 1A Absorbent articles (sanitary napkins)
2 Back sheet 3 Top sheet 4 Absorbent body 4H High basis weight portion of absorbent body 7 Side sheet 8 Main body (absorbent article main body)
10 Central compression groove 11 First rear compression groove 11C First arcuate portion 11Ct Vertex 11ex of first arcuate portion Extension portion 11L Second arcuate portion 11Lt Vertex 11R of second arcuate portion Third arcuate portion 11Rt Vertex 11r of third arcuate portion Connecting portion 12 Second rear compression groove 12ft Front end of the second rear compression groove 12t Rear vertex 13 of the second rear compression groove Front compression groove C Body fluid outlet opposing region CL Longitudinal center line D1 Longitudinal direction D2 Lateral direction F Front region HF Hip Hold Flap M Middle area (opposite perineum area)
B Buttock opposing area B1 Front buttock opposing area (gluteal cleft opposing area)
B2 Rear buttock opposing area WF Wing flap Y, Y' Imaginary line drawn along the extension part

Claims

It has an elongated main body including a top sheet on the skin side, a back sheet on the non-skin side opposite to the skin side, and an absorbent body disposed between the top sheet and the back sheet,
A compression groove is formed in at least the top sheet and the absorbent body, the groove being depressed from the top sheet side to the back sheet side,
The compression grooves include a first rear compression groove formed in a region facing the buttocks of the wearer when worn, and a second rear compression groove formed behind the first rear compression groove and spaced apart from the first rear compression groove. and a rear compression groove;
The first rear compression groove includes a first arcuate portion that is convex to the rear, a second arcuate portion that is located to the left front of the first arcuate portion and is convex to the left rear, and a second arcuate portion that is located to the right front of the first arcuate portion. and a third arcuate portion located at the rear right side and convex on the right rear side;
An absorbent article, wherein the second rear compression groove has a rearwardly convex shape.
The absorbent article according to claim 1, wherein the front tip of the second rear compression groove is located behind the top of the first arcuate portion of the first rear compression groove.
A connecting portion between the first arcuate portion and the second arcuate portion and a connecting portion between the first arcuate portion and the third arcuate portion each include a portion where the slope of a tangent line changes discontinuously. 2. The absorbent article according to 1 or 2.
The absorbent article according to claim 1 or 2, wherein the first arcuate portion has a pair of extension portions that extend the arc of the first arcuate portion forward.
The pair of extensions are each inclined so as to approach the center in the lateral direction as they move forward, and each of the imaginary lines drawn along the pair of extensions passes through the front end of the second rear compression groove. The absorbent article according to item 4.