JP2023176162A - Absorbent article - Google Patents

Abstract

To provide an absorbent article that offers an improved fit to the buttocks and prevents any leakage along the same.SOLUTION: There is provided an absorbent article configured so that: compressed grooves that are recessed from a top sheet side toward a back sheet side are formed in at least a top sheet and an absorber; the compressed grooves include a pair of central compressed grooves extending along a longitudinal direction and a pair of first rear compressed grooves which is rearward of the pair of the central compressed grooves and which are spaced apart at a prescribed distance in the longitudinal direction from the pair of the central compressed grooves; the prescribed distance in the longitudinal direction is greater than a distance in a lateral direction between rear ends of the pair of the central compressed grooves and a distance in the lateral direction between front ends of the pair of the first rear compressed grooves; and on respective sides of a center line in the longitudinal direction, virtual lines that pass the rear ends of the pair of the central compressed grooves and the front ends of the pair of the first rear compressed grooves extend substantially parallel to the longitudinal direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to absorbent articles.

2. Description of the Related Art In absorbent articles such as sanitary napkins, a configuration in which the rear region of the main body is lengthened is known in order to accommodate use over a long period of time or while sleeping at night.

In the above-mentioned absorbent article with a long rear region, the compressed grooves (emboss) compressed from the top sheet side extend over a wide range from the region corresponding to the body fluid outlet to the rear region along the longitudinal direction. Many of them are formed continuously (for example, Patent Documents 1 and 2).

Japanese Patent Application Publication No. 2009-100846 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 further improve the fit to the buttocks, particularly to the intergluteal cleft, 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 to the buttocks and can prevent the occurrence of leakage.

A first aspect of the present invention includes 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. An absorbent article having an elongated main body, wherein at least the top sheet and the absorbent body are formed with compression grooves that are recessed from the top sheet side to the back sheet side, and the compression grooves are formed in the longitudinal direction. a pair of central compression grooves extending along the predetermined longitudinal direction, and a pair of rear compression grooves spaced apart from the pair of central compression grooves at a predetermined longitudinal interval behind the pair of central compression grooves; the directional spacing is greater than the lateral spacing between the rear ends of the pair of central compression grooves and the lateral spacing of the front ends of the pair of rear compression grooves, and on each side of the longitudinal centerline, the rear of the pair of central compression grooves; An imaginary line passing through the end and the front end of the pair of rear compression grooves extends substantially parallel to the longitudinal direction.

In the first aspect, when pressure is applied from both sides of the main body, the portion between the rear ends of the pair of central compression grooves and the front end of the pair of rear compression grooves (a pair of first rear compression grooves described below) Parts tend to bulge out against the skin. Here, the rear end of the central compression groove and the front end of the rear compression groove are arranged so that the imaginary line passing through them on each side of the longitudinal center line is approximately parallel to the longitudinal direction, so that The bulge between the rear ends of the central compression groove and the bulge between the front ends of the rear compression grooves are linked, and a bulge is also formed in the region between the pair of central compression grooves and the pair of rear compression grooves along the longitudinal direction. can be done. Furthermore, the distance between the pair of central compressed grooves and the pair of rear compressed grooves is larger than the lateral distance between the rear ends of the pair of central compressed grooves, and is also larger than the lateral distance between the pair of rear compressed grooves. Therefore, a mountain can be formed that has a certain length along the longitudinal direction and is relatively narrow in the lateral direction. That is, it is possible to form a mountain extending along the longitudinal direction with a total of four locations (two locations in the front and two locations in the rear) of the rear ends of the pair of central compression grooves and the front ends of the pair of rear compression grooves as base points. Since such a mountain can be inserted into the deep part of the intergluteal cleft when the absorbent article is worn, the absorbent article can be brought into close contact along the intergluteal cleft. Further, even if the wearer moves his or her body, the formed ridges are difficult to separate from the intergluteal cleft, and close contact is maintained. Therefore, it is possible to prevent the body fluid that has flowed backward from the body fluid discharge port from leaking (hereinafter also referred to as leakage).

In addition, since the rear ends of the pair of central compression grooves and the front ends of the pair of rear compression grooves are separated from each other, the area between the pair of central compression grooves and the pair of rear compression grooves can be made flexible. can be flexibly transformed according to the situation. Therefore, the above-mentioned mountain formed between the pair of central compressed grooves and the pair of rear compressed grooves can be flexibly deformed according to the shape of the wearer's body and the manner of wearing.

In a second aspect of the present invention, the pair of central compression grooves include a rear end and include a portion that slopes toward the longitudinal center line as it goes rearward, and the pair of rear compression grooves include a portion that includes a rear end and slopes toward the longitudinal center line, and the pair of rear compression grooves include a front end. and includes a portion that slopes closer to the longitudinal centerline as it goes forward.

According to the second aspect, the distance between the rear end portions of the pair of central compression grooves is narrower than the other portions, and the distance between the front end portions of the pair of rear compression grooves is narrower than the other portions. The mountain formed in the region between the central compression groove and the pair of rear compression grooves can be formed narrower than other parts of the compression groove. This allows the formation of a peak that is more suitable for entering the gluteal cleft.

In a third aspect of the present invention, the difference between the inclination angle of the rear end portion of the central compressed groove with respect to the longitudinal center line and the inclination angle of the front end portion of the rear compressed groove with respect to the longitudinal center line is 10° or less. be.

In the third aspect of the present invention, when the slope of the rear end portion of the central compressed groove and the slope of the front end portion of the rear compressed groove are the same or close to each other, a force that twists or twists the absorbent article is applied. However, since the force is easily released in the direction connecting the central compressed groove on one side of the longitudinal centerline and the rear compressed groove on the other side, unnecessary stress can cause the pair of central compressed grooves and the pair of rear compressed grooves to This can reduce the possibility that the mountain that forms between the two ends will collapse. Even when the wearer moves his or her legs significantly, the area facing the intergluteal cleft can be deformed to follow the wearer's body.

In a fourth aspect of the present invention, the pair of rear compression grooves are connected at the rear.

According to the fourth aspect, the body fluid that has diffused rearward between the rear compression grooves can be blocked at the rear of the rear compression grooves, and the leakage prevention effect is improved.

In a fifth aspect of the present invention, the lateral spacing between the front ends of the pair of rear compression grooves is the same as or smaller than the lateral spacing between the rear ends of the pair of central compression grooves.

According to the fifth aspect, the lateral length (width) of the mountain formed in the region between the pair of central compression grooves and the pair of rear compression grooves is the same in the longitudinal direction or You can make it smaller as you go. Since the intergluteal cleft gradually becomes shallower toward the rear, the configuration according to this embodiment makes it easier to align the above-mentioned peak with the shape of the intergluteal cleft.

In a sixth aspect of the present invention, the compression groove further includes a side compression groove extending along the longitudinal direction on the outer side in the lateral direction of the pair of rear compression grooves, and after the side compression groove The end portions are each curved toward the rear squeeze groove.

According to the sixth aspect, the rigidity of the region between the rear compression groove and the side compression groove formed laterally outward thereof is slightly increased. This makes it possible to avoid unnecessary wrinkles and twists in the area between the rear compressed groove and the side compressed groove, and makes it possible to align the area along the buttocks on both sides of the intergluteal cleft. The absorbent article can be brought into closer contact with both sides of the buttocks, and the leakage prevention effect can be enhanced.

According to one aspect of the present invention, it is possible to provide an absorbent article that has a high fit to 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, seen 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. It is a schematic diagram for demonstrating the function of a compression groove. It is a figure which shows the modification of 1st Embodiment. It is a figure showing another modification of a 1st embodiment. FIG. 2 is a plan view of an absorbent article according to a second embodiment of the present invention, seen from the skin side. 8 is a sectional view taken along the line III-III in FIG. 7. FIG. 8 is a partially enlarged view of FIG. 7. FIG. It is a schematic diagram for demonstrating the function of a compression groove. It is a figure which shows the modification of 2nd Embodiment.

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>
First, the basic structure of an absorbent article will be explained using a sanitary napkin for night use or long-term use as an example. 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 having 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 allows body fluids such as menstrual blood, vaginal discharge, and urine to quickly 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.

The absorbent body 4 may be mixed with synthetic fibers. 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. 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 D<b>2 to form a plurality of layers of band-shaped portions extending along the sides 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-facing region B2 is a region further back from the rear part of the gluteal cleft or the vicinity of the rear end of the gluteal cleft, particularly a region behind (or above if the person is standing up) the gluteal groove, which can be said to be the boundary between the buttocks and legs. It may be an area that can face the 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 buttock 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 absorbent articles with a long rear part, which is greater than the length of D1. Further, the length in the longitudinal direction D1 of the front buttock-facing region (gluteal cleft-facing 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.

Further, a pair of hip hold flaps HF, HF may be formed extending from the side of the main body 8 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 7, 7 in the lateral direction D2 and the outwardly extending portions of the backsheet 2 in the lateral direction D2.

<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 convex roll is placed on the top sheet 3 side of the laminate, and a flat roll is placed on the absorber 4 side, and the laminate is sandwiched between the two rolls to apply pressure. 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.

Furthermore, a pair of first rear compression grooves (pair of rear compression grooves) 11, 11 are formed at the rear of the pair of central compression grooves 10, 10 and spaced apart from the pair of central compression grooves 10, 10. . The pair of first rear compression grooves 11, 11 are formed in the intergluteal cleft facing region B1, and are preferably located within the buttock facing region B. In the illustrated example, the pair of first rear compression grooves 11, 11 are spaced apart from each other in the lateral direction D2.

A second rear compressed groove 12 is formed at the rear of the pair of first rear compressed grooves 11, 11 so as to be spaced apart from the pair of first rear compressed grooves 11, 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. 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 a portion from the rear portions of the pair of central compressed grooves 10, 10 to the second rear compressed grooves 12. As shown in FIG. 3, the rear ends 10bt, 10bt of the pair of central compression grooves 10, 10 are spaced apart from each other. Further, the front ends 11ft, 11ft of the pair of first rear compression grooves 11, 11 are also spaced apart from each other. On each side of the longitudinal center line CL, the rear end 10bt of the central compressed groove 10 and the front end 11ft of the first rear compressed groove 11 are aligned in the longitudinal direction D1. More specifically, a virtual line passing through the rear end 10bt of the left groove of the pair of central compressed grooves 10 and the front end 11ft of the left groove of the pair of first rear compressed grooves 11 on the left side of the longitudinal center line CL. When X1 is drawn, the virtual line X1 is approximately parallel to the longitudinal direction. Further, on the right side of the longitudinal center line CL, draw an imaginary line In this case, the virtual line X1' is substantially parallel to the longitudinal direction. Note that in this specification, a direction that is substantially parallel to a predetermined direction is not only a direction that is completely parallel to the predetermined direction, but also a direction that is preferably ±10°, more preferably ±5° with respect to the predetermined direction. Including directions extending at an angle.

When the absorbent article 1 is worn, the body fluid outlet facing region C and the perineum facing region M receive leg force from the outside in the lateral direction D2, so the intergluteal cleft facing region B1 also receives the force from the outside in the lateral direction D2. A force is applied from the point toward the longitudinal center line CL. Further, when the wearer wears the absorbent article 1, the wearer may push the main body 8 of the absorbent article 1 from both sides, thereby deforming the intergluteal cleft opposing region B1 so that the center in the lateral direction D2 is aligned with the intergluteal cleft. When such forces P and P (FIG. 3) are applied from the outside in the lateral direction D2, the portion between the pair of central compressed grooves 10, 10 that are separated from each other swells toward the skin side and becomes separated from each other. The portion between the pair of first rear compression grooves 11, 11 also swells toward the skin side. Here, although the pair of central compressed grooves 10, 10 and the pair of first rear compressed grooves 11, 11 are separated in the longitudinal direction D1, as described above, the rear ends of the pair of central compressed grooves 10, 10 10bt, 10bt and the front ends 11ft, 11ft of the pair of first rear compressed grooves 11, 11 are aligned in the longitudinal direction D1 on each side of the longitudinal center line CL, so that the pair of central compressed grooves 10, 10 and the behavior of the pair of first rear compressed grooves 11, 11 have continuity in the longitudinal direction. That is, the bulge between the pair of central compressed grooves 10, 10 and the bulge between the pair of first rear compressed grooves 11, 11 are interlocked in the longitudinal direction D1, and the bulge between the pair of central compressed grooves 10, 10 and the pair of first A bulge toward the skin is formed in the area between the first rear compression grooves 11 and 11.

In this embodiment, as shown in FIG. The lateral direction D2 interval _d10 between the rear ends 10bt, 10bt is larger than the lateral direction D2 interval d10 between the front ends 11ft, 11ft of the pair of first rear compressed grooves 11, ₁₁ (L> _d10 , and L>d ₁₁ ). Therefore, the above-mentioned bulge has a certain length along the longitudinal direction D1 and becomes a relatively narrow ridge in the lateral direction D2. In other words, along the longitudinal direction D1 with a total of four points as base points: the rear ends 10bt, 10bt of the pair of central compression grooves 10, 10 and the front ends 11ft, 11ft of the pair of first rear compression grooves 11, 11. A long, raised mountain on the skin side may be formed. In FIG. 3, a mountain-forming region 20 that can swell and become a mountain when worn is shown by cross hatching.

Here, with reference to FIG. 4, the effects of the above-described configurations of the central compression grooves 10, 10 and the first rear compression grooves 11, 11 will be explained. FIG. 4 shows a schematic cross section (II-II line cross section in FIG. 3) taken at a position between the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11, showing the buttocks of the wearer. Shown with Den. When the intergluteal cleft opposing region B1 of the absorbent article 1 is pushed from the outside toward the center in the lateral direction D2 (in the direction of arrows P and P in FIG. 3), as shown in FIG. 4(a), the mountain in FIG. The formation region 20 rises as a narrow mountain. Then, when wearing the absorbent article, as shown in FIG. 4(b), the peaks enter into the crack (gluteal cleft) of the buttocks Den, and the areas on both sides of the peaks are aligned with the surface of the buttocks. 1 can be brought into close contact with the body, resulting in a high fit. Further, even if the wearer moves his or her body, for example, turns over while sleeping, the peak once brought into close contact tends to be maintained within the intergluteal cleft. Thereby, the body fluid transmitted backward from the body fluid discharge port can be received and absorbed more reliably. In this way, it is possible to prevent so-called leakage, in which body fluids are transmitted along the intergluteal cleft and leak backward or laterally.

In addition, regarding an absorbent article with a long rear region including a region that can face the buttocks from the intergluteal cleft to the rear of the intergluteal cleft, the main body 8 of the absorbent article 1 is arranged such that the center of the main body 8 in the lateral direction D2 is Many people wear it by modifying it so that it fits into the buttock cleft. The present embodiment is a usage mode in which the main body 8 is deformed by itself when worn to make a close contact with the absorbent article 1, and in particular, the close contact of the absorbent article 1 to the buttocks can be improved.

Furthermore, as shown in FIG. 3, since the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11 are separated from each other, the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11 are separated from each other. The region between the rear compression grooves 11, 11 can maintain flexibility, and can be flexibly deformed depending on the situation. Therefore, the above-mentioned mountain formed between the pair of central compressed grooves 10, 10 and the pair of first rear compressed grooves 11, 11 can be flexibly deformed according to the shape of the wearer's body and the manner of wearing. can be done. For example, the mountain can be easily curved in the longitudinal direction D1 along the longitudinal curvature of the body, and the degree of curvature can also be easily changed. Furthermore, even if a force that causes the mountain portion to be twisted is applied, it can be deformed in accordance with such twisting, so it can maintain a state in close contact with the body. Note that between the pair of central compressed grooves 10, 10 and the pair of first rear compressed grooves 11, 11, a compressed groove or a compressed part formed by compressing the top sheet 3 and the absorbent core 4 is formed. Preferably not.

The distance d ₁₀ in the lateral direction D2 between the rear ends 10bt, 10bt of the pair of central compressed grooves 10, 10 may be preferably 5 to 30 mm, more preferably 10 to 20 mm. The distance d ₁₁ in the lateral direction D2 between the front ends 11 ft, 11 ft of the pair of first rear compressed grooves 11, 11 may also be preferably 5 to 30 mm, more preferably 10 to 20 mm. Further, the distance d ₁₀ may be preferably 5 to 30%, more preferably 10 to 25% of the length of the absorbent body in the lateral direction D2 (width of the absorbent body). The distance d ₁₁ may also be preferably 5 to 30%, more preferably 10 to 25% of the length D2 of the absorbent body in the lateral direction (width of the absorbent body). By setting the distance d ₁₀ and the distance d ₁₁ within the above ranges, the width of the formed peak can be made such that it is possible to form the peak in a normal usage method and to allow it to fit into the intergluteal cleft.

Furthermore, the distance L in the longitudinal direction D1 between the pair of central compressed grooves 10, 10 and the pair of first rear compressed grooves 11, 11 may be preferably 10 to 60 mm, more preferably 20 to 40 mm. By setting the interval L within the above range, it is possible to form a peak having an appropriate length in the longitudinal direction D1 that matches the length of the intergluteal cleft in the anteroposterior direction.

When the configuration of the compressed grooves is line symmetrical with respect to the longitudinal centerline CL as an axis of symmetry, the distance d ₁₀ in the lateral direction D2 between the rear ends 10bt, 10bt of the pair of central compressed grooves 10, 10, and the pair of first rear The distance d11 in the lateral direction D2 between the front ends 11ft, 11ft of the compression grooves 11, ₁₁ is equal to or different from the value of the ratio of one to the other ( _d10 / _d11 or _d11 / _d10 ) is preferably about 0.8 to 1.2, more preferably about 0.9 to 1.1. Furthermore, the distance d ₁₁ in the lateral direction D2 between the pair of first rear compression grooves 11, 11 is the same as the distance d 10 in the lateral direction D2 between the rear ends 10bt, 10bt of the pair of central compression grooves 10, ₁₀ , or the interval concerned. d is preferably smaller than ₁₀ . Thereby, the width of the peak formed in the region between the pair of central compressed grooves 10, 10 and the pair of first rear compressed grooves 11, 11 becomes smaller toward the rear. This allows it to adapt to the shape of the intergluteal cleft, which gradually becomes shallower toward the rear.

Moreover, as shown in FIG. 3, the groove width of the pair of first rear compressed grooves 11, 11 is preferably larger than the groove width of the pair of central compressed grooves 10, 10. The further back you go, the less force you receive from your legs, making it less likely that deformation will occur when you wear it. Therefore, by increasing the groove width of the first rear compression grooves 11, 11 located rearward than the central compression grooves 10, 10, the function as the bending base point of the first rear compression grooves 11, 11 is enhanced. This makes it easier to form the above-mentioned mountain.

As shown in FIG. 3, the pair of central compression grooves 10, 10 may be inclined at the rear, and the pair of first rear compression grooves 11, 11 may be inclined at the front. A total of four parts, the rear end parts of the grooves 10, 10 and the front end parts of the pair of first rear compressed grooves 11, 11, may be inclined toward the longitudinal center line and arranged radially. More specifically, the pair of central compressed grooves 10, 10 are inclined toward the longitudinal center line CL on the rear end side. That is, the pair of central compression grooves 10, 10 may include inclined portions (slanted rear end portions) 10b, 10b that include the rear end and are inclined so as to approach the longitudinal center line CL as they go rearward. The inclined portions 10b, 10b may be straight or curved. The inclination angle α of the inclined portion 10b may preferably be greater than 0° to 60°, more preferably 10 to 40° with respect to the longitudinal centerline CL. Incidentally, the inclination angle of the inclined portion of the compressed groove may be the angle formed between the center line of the compressed groove and the longitudinal center line CL, and the angle formed by the tangent of the center line of the compressed groove at the tip of the compressed groove and the longitudinal center line CL. It can be the angle formed by Moreover, the pair of first rear compression grooves 11, 11 are also inclined so as to approach the longitudinal center line CL on the front end side. That is, the pair of first rear compression grooves 11, 11 may include inclined portions (slanted front end portions) 11f, 11f that include the front end and are inclined so as to approach the longitudinal center line CL as they go forward. However, in the example shown in FIG. 3, the pair of first rear compression grooves 11, 11 as a whole are respectively inclined portions that are inclined toward the longitudinal center line CL. The inclination angle β of the first rear compressed grooves 11, 11 (or the inclined front end portion included in the first rear compressed grooves 11, 11) is also preferably greater than 0° to 60° with respect to the longitudinal center line CL. Preferably, the angle may be 10° to 40°.

In the above configuration, when a force that twists or twists the absorbent article 1 is applied, for example, the inclined portion 10b of the central compressed groove 10 on one side (for example, the left side) of the longitudinal center line CL and the inclined portion 10b on the other side (for example, the right side) ) becomes easier to interlock with the inclined portion 10f of the first rear compression groove 11, and it becomes easier to release the force in the direction that connects the two. Therefore, even if a force that causes the absorbent article 1 to be twisted is applied, unnecessary stress may cause a mountain to be formed between the pair of central compressed grooves 10, 10 and the pair of first rear compressed grooves 11, 11. becomes less likely to collapse. The fit of the intergluteal cleft opposing region B1 to the intergluteal cleft can be maintained.

Furthermore, the inclination angle α of the inclined portions 10b, 10b of the central compression grooves 10, 10, and the inclination angle β of the first rear compression grooves 11, 11 (or the inclined front end portion included in the first rear compression grooves 11, 11). may be the same or different, but the difference between the inclination angle α and the inclination angle β (α-β or β-α) is preferably 10° or less, and preferably 5° or less. More preferred. That is, it is preferable that the extending direction of the rear end side portions of the central compressed grooves 10, 10 is the same as or close to the extending direction of the front end side portions of the first rear compressed grooves 11, 11. Thereby, the effect that the mountain formed in the area between the pair of central compressed grooves 10, 10 and the pair of first rear compressed grooves 11, 11 becomes difficult to collapse can be improved.

<Modified example of the first embodiment>
FIG. 5 shows a modification of the first embodiment. The example shown in FIG. 5 has the same configuration as the example shown in FIG. 1 except that the shape of the pair of first rear compression grooves 11, 11 is different. Further, the example shown in FIG. 5 also has the same effect as the example shown in FIG. 1. Furthermore, in the example shown in FIG. 5, the pair of first rear compressed grooves 11, 11 are connected to each other at the rear thereof, and have a U-shape or a horseshoe shape that is convex toward the rear as a whole. Since the pair of first rear compression grooves 11, 11 are connected at the rear, the body fluid that has diffused rearward can be blocked by the compression groove. Moreover, since the main body 8 can be easily bent in the longitudinal direction D1 at the connecting portion between the pair of first rear compression grooves 11, 11, the main body 8 can be easily bent in accordance with the front-rear direction of the body.

FIG. 6 shows another modification of the first embodiment. In the example shown in FIG. 6, the basic configuration of the absorbent article is the same as the example shown in FIG. 1, but the shapes of the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11 are different Give an example. More specifically, the pair of central compression grooves 10, 10 are each substantially parallel to the longitudinal direction D1 at the rear, and the pair of first rear compression grooves 11, 11 are also approximately parallel to the longitudinal direction D1 at the front. They are almost parallel. Also in this example, the interval in the longitudinal direction D1 between the pair of central compressed grooves 10, 10 and the pair of first rear compressed grooves 11, 11 is the lateral direction of the rear ends 10bt, 10bt of the pair of central compressed grooves 10, 10. D2 and the front ends 11ft of the pair of first rear compressed grooves 11, 11, larger than the lateral direction D2 interval of 11ft, and on each side of the longitudinal center line CL, the rear ends 10bt of the pair of central compressed grooves 10. , and the front ends 11ft of the first rear compressed grooves 11 are aligned in the longitudinal direction D1, so similarly to the example shown in FIG. 11, a narrow mountain (FIG. 4) can be formed along the longitudinal direction D1. Therefore, the buttock-facing region B can be deformed to fit the intergluteal cleft, and leakage of bodily fluids can be prevented.

[Second embodiment]
FIG. 7 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. 8 shows a cross-sectional view taken along the line III--III in FIG. 7. The basic configuration of the absorbent article 1A according to the second embodiment is also the same as that of the first embodiment (FIGS. 1 to 6), but the shape of the compression groove in the intergluteal cleft opposing region B1 is different from that of the first embodiment. It's different. That is, side compression grooves 11S, 11S are formed on both sides of the pair of first rear compression grooves 11, 11, respectively. 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 side compression grooves 11S, 11S.

FIG. 9 shows an enlarged view of a portion from the pair of central compression grooves 10, 10 to the second rear compression groove 12 in FIG. 7. As shown in FIG. 9, the side compression groove 11S branches from the first rear compression groove 11, extends along the lateral direction D2, and further extends forward along the longitudinal direction D1. By forming the side compression grooves 11S, the first rear compression grooves 11 and the side compression grooves 11S form compression grooves that are convex to the rear. And since the rigidity of the regions 30, 30 (diagonal lines in FIG. 9) surrounded by the first rear compressed groove 11 and the side compressed grooves 11S can be made slightly higher, it is possible to prevent twisting or the like in this region. In addition, from the viewpoint of securing a certain area of the regions 30, 30, the separation distance in the lateral direction D2 between the side compressed grooves 11S, 11S is the same as that between the central compressed grooves 10, 10 and the first rear compressed grooves 11, 11. In the range of the longitudinal direction D1 between, the rear ends 10bt of the central compressed grooves 10, 10, the lateral D2 interval d of the _10bt , or the front ends 11ft of the first rear compressed grooves 11, 11, the lateral D2 interval d of 11ft. It is preferably 2.5 to 4.5 times that of ₁₁ , and more preferably 3 to 4 times.

As shown in FIG. 9, regions 30, 30 respectively surrounded by the first rear compressed grooves 11, 11 and the side compressed grooves 11S, 11S are composed of a pair of central compressed grooves 10, 10 and a pair of first rear compressed grooves. 11, 11, is formed on the outside in the lateral direction D2 of the mountain forming region 20 (cross hatched in FIG. 9) along the longitudinal direction D1.

In FIG. 10, a schematic cross section (IV-IV line cross section in FIG. 9) taken at a position between the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11 is shown in the buttocks Den of the wearer. Shown with FIG. 10 is a diagram corresponding to FIG. 4, but shows the positions of the side compression grooves 11S, 11S in the second embodiment. As shown in FIG. 10, when the absorbent article 1 is worn, the regions 30, 30 become a shallow position of the intergluteal cleft or a region that contacts the buttock surfaces on both sides of the intergluteal cleft. Therefore, the regions 30, 30 can also be brought into contact with the surfaces on both sides of the intergluteal cleft along its roundness. This improves the fit on both sides of the intergluteal cleft, so even if the body fluid that has passed through the intergluteal cleft moves further outward in the lateral direction D2, leakage can be prevented.

The front ends 11St, 11St of the side compression grooves 11S, 11S are preferably located further forward than the front ends 11ft, 11ft of the first rear compression grooves 11, 11. As a result, the compression groove can be extended outward in the lateral direction D2 in the area between the central compression grooves 10, 10 and the first rear compression grooves 11, 11, and leakage of body fluids to the outside in the lateral direction D2 can be prevented. enable.

In addition, in order to further enhance the effect of preventing twisting and the like in the rigidity of the regions 30, 30, a plurality of compression grooves are provided in the absorbent body 4 in the region 30 surrounded by the first rear compression groove 11 and the side compression groove 11S. They can also be formed spaced apart. The form (shape, size, formation method) of the compressed portion formed in the absorbent body 4 may be particularly selected as long as it prevents the regions 30, 30 from twisting and also ensures flexibility to conform to the surface of the buttocks. Not limited.

The side compression groove 11S may or may not be connected to the first rear compression groove 11. From the viewpoint of increasing the rigidity of the region 30 surrounded by the first rear compression groove 11 and the side compression groove 11S to prevent twisting and from the viewpoint of preventing body fluid leakage to the rear, as shown in FIGS. 7 and 9. , it is preferable that the side compression groove 11S is connected to the first rear compression groove 11.

On the other hand, from the viewpoint of increasing the flexibility of the intergluteal cleft facing region B1, as shown in FIG. 11, a configuration may be adopted in which the side compression grooves 11S and the first rear compression grooves 11 are not connected. In that case, the side compression grooves 11S may be separated from the first rear compression grooves 11 by, for example, a distance of 10 mm or less, preferably 5 mm or less, in the lateral direction.

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.

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 10b Slanted portion of central compression groove (slanted rear end portion)
10bt Rear end of central compression groove 11 First rear compression groove 11f Slope portion of first rear compression groove (slope front end portion)
11ft Front end of first rear compression groove 11S Side compression groove 11St Front end of lateral compression groove 12 Second rear compression groove 13 Front compression groove C Body fluid outlet opposing area CL Longitudinal center line D1 Longitudinal direction D2 Lateral direction F Front area 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

Claims (6)

An absorbent article having an elongated main body comprising 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. There it is,
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 groove is
a pair of central compression grooves extending along the longitudinal direction;
At the rear of the pair of central compression grooves, a pair of rear compression grooves are spaced apart from the pair of central compression grooves by a predetermined longitudinal interval;
The predetermined longitudinal interval is larger than the lateral interval between the rear ends of the pair of central compression grooves and the lateral interval between the front ends of the pair of rear compression grooves,
An absorbent article, wherein on each side of the longitudinal center line, an imaginary line passing through the rear ends of the pair of central compressed grooves and the front ends of the pair of rear compressed grooves extends substantially parallel to the longitudinal direction. The pair of central compressed grooves include a rear end and include a portion that slopes closer to the longitudinal center line as it goes rearward, and the pair of rear compressed grooves include a front end and slope closer to the longitudinal center line as it goes forward. The absorbent article of claim 1, comprising a portion that slopes toward a line. According to claim 1 or 2, the difference between the inclination angle of the rear end portion of the central compressed groove with respect to the longitudinal center line and the inclination angle of the front end portion of the rear compressed groove with respect to the longitudinal center line of the rear end portion is 10° or less. absorbent articles. The absorbent article according to claim 1 or 2, wherein the pair of rear compression grooves are connected at the rear. The absorbent article according to claim 1 or 2, wherein the lateral distance between the front ends of the pair of rear compressed grooves is the same as or smaller than the lateral distance between the rear ends of the pair of central compressed grooves. The compression grooves further include side compression grooves extending along the longitudinal direction on the lateral sides of the pair of rear compression grooves,
The absorbent article according to claim 1 or 2, wherein rear end portions of the side compression grooves are each curved toward the rear compression groove.

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