Absorbent article

Abstract

To more surely form a high compression part in an absorbent article in which the high compression parts that are apart from each other are formed respectively in a pair of left and right grooves provided on the skin side.SOLUTION: A groove which is recessed from a top sheet to a back sheet is formed in an absorbent article. The groove includes: a central groove which extends in the longitudinal direction; and a left oblique direction groove and a right oblique direction groove which are formed such that a distance therebetween becomes larger as being apart from the central groove in regions on end sides in the longitudinal direction with respect to the central groove. A plurality of left high compression parts are formed so as to be apart from each other in the longitudinal direction in the left oblique direction groove, and a plurality of right high compression parts are formed so as to be apart from each other in the longitudinal direction in the right oblique direction groove. When the left high compression part and the right high compression part are projected on the straight line in parallel to the longitudinal direction, the projection range of the left high compression part and the projection range of the right high compression part are at least partially alternately located.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to absorbent articles.

Background Art

[0002] Many absorbent articles such as sanitary napkins, pantiliners, incontinence pads, etc. have grooves provided on the skin side for the purpose of guiding the discharged body fluids and promoting the conformable deformation of the body.

[0003] For example, Patent Document 1 describes an absorbent article provided with a main body squeezing groove on the surface sheet side of the main body. The same document describes that the main body squeezing groove has an intermediate groove portion and front and rear groove portions, and each groove portion includes a high squeezing portion arranged mutually spaced apart in the extending direction of each groove portion, and a low squeezing portion interposed between the high squeezing portions.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The squeezing grooves as described in Patent Document 1 are formed using an embossing roll provided with convex portions for forming a low-pressure squeezing portion provided on the outer peripheral surface and convex portions for forming a high-pressure squeezing portion protruding further from the convex portions for forming the low-pressure squeezing portion. For example, a laminate including a surface sheet and an absorber is formed by pressing it between a roll pair of the embossing roll and a flat roll having a flat outer peripheral surface (paragraph 0030 etc. of Patent Document 1). The roll pair is usually arranged such that its axial direction corresponds to the left-right direction of the absorbent article, and the squeezing grooves are formed along the longitudinal direction. Conventionally, the high-pressure squeezing portions provided in each of the pair of left-right grooves such as the front-back groove portions described in Patent Document 1 are formed at the same position in the longitudinal direction. In that case, in the process of forming the squeezing grooves, along the longitudinal direction, the period in which the high-pressure squeezing portion on the left side and the high-pressure squeezing portion on the right side are simultaneously formed and the period in which the high-pressure squeezing portion is not formed are alternately repeated. And since the pressure received by the absorbent article is different when the high-pressure squeezing portion is formed and when the high-pressure squeezing portion is not formed, pressure fluctuations are repeated during the groove forming process. If such pressure fluctuations are large, depending on the groove forming conditions (roll pressure, conveyance speed, rigidity of the absorber before squeezing, etc.), the behavior of the roll pair becomes unstable, and the high-pressure squeezing portion may not be formed to the desired depth, or unevenness may occur in the squeezing depth.

[0006] In view of the above points, one aspect of the present invention aims to more reliably form the high-pressure squeezing portion in an absorbent article in which separated high-pressure squeezing portions are formed in each of a pair of left-right grooves provided on the skin side.

Means for Solving the Problem

[0007] A first aspect of the present invention is an absorbent article including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber provided between the top sheet and the back sheet, the absorbent article having a longitudinal direction and a lateral direction orthogonal to the longitudinal direction, wherein a groove recessed from the top sheet toward the back sheet is formed, the groove including a central groove extending in the longitudinal direction, and a left diagonal groove and a right diagonal groove formed in a region on the end side in the longitudinal direction from the central groove such that the distance between them increases as they are farther from the central groove, a plurality of left high-pressure squeezing portions are formed in the left diagonal groove at intervals in the extending direction of the left diagonal groove, and a plurality of right high-pressure squeezing portions are formed in the right diagonal groove at intervals in the extending direction of the right diagonal groove, and when the left high-pressure squeezing portions and the right high-pressure squeezing portions are projected onto a straight line parallel to the longitudinal direction, the projection ranges of the left high-pressure squeezing portions and the projection ranges of the right high-pressure squeezing portions are at least partially staggered with each other.

[0008] According to the above first aspect, since a pair of diagonal grooves (left diagonal groove and right diagonal groove) are formed in the region on the end side in the longitudinal direction from the central groove, a three-dimensional deformation of the absorbent article adapted to the shape of the body can be promoted. More specifically, the absorbent article bends with the pair of diagonal grooves as a base axis, and it becomes easy to bring the region between the pair of left and right diagonal grooves into contact with the front and / or rear surfaces of the body. Further, since high-pressure squeezing portions are provided in the pair of left and right diagonal grooves, the grooves are reinforced, and the left diagonal groove and the right diagonal groove can function better as a base axis for deformation during wearing. Also, since the high-pressure squeezing portions are spaced apart, the bottom and the periphery of the groove do not become excessively hard, and can be naturally curved in the longitudinal direction D1 as required.

[0009] In addition, in this aspect, when the left high-pressure squeezing part and the right high-pressure squeezing part are projected onto a straight line parallel to the longitudinal direction, the projection ranges of the left high-pressure squeezing part and the right high-pressure squeezing part are at least partially staggered from each other. Thereby, in the groove forming step, large fluctuations in pressure can be suppressed, and more stable operation (operation) of the device can be maintained. Therefore, along the longitudinal direction, the high-pressure squeezing part can be accurately formed at a desired arrangement and a desired squeezing depth. Thereby, the functions of the left diagonal groove and the right diagonal groove become more reliable, and deformation of the absorbent article along the shape of the body becomes easier.

[0010] In the second aspect of the present invention, the interval between the projection range of the left high-pressure squeezing part and the projection range of the right high-pressure squeezing part adjacent to the projection range of the left high-pressure squeezing part in the longitudinal direction is zero, or the two projection ranges overlap.

[0011] According to the second aspect described above, since there is no period during which neither the left high-pressure squeezing part nor the right high-pressure squeezing part is formed between the projection range of the left high-pressure squeezing part and the projection range of the right high-pressure squeezing part adjacent to the projection range of the left high-pressure squeezing part, fluctuations in pressure in the squeezing groove forming step can be further suppressed, and stable squeezing behavior of the device can be maintained. Therefore, the high-pressure squeezing part can be formed at a desired arrangement and depth over the entire groove, and the functions of the left diagonal groove and the right diagonal groove can be enhanced.

[0012] In the third aspect of the present invention, the intervals between the left high-pressure squeezing parts along the extending direction of the left diagonal groove are constant, and / or the intervals between the right high-pressure squeezing parts along the extending direction of the right diagonal groove are constant.

[0013] According to the third aspect described above, since the intervals between the high-pressure squeezing parts are constant along the extending direction of the diagonal groove, the diagonal groove is uniformly reinforced by the high-pressure squeezing parts over the entire extending direction, and the effect of promoting three-dimensional deformation of the front and / or rear of the absorbent article can be enhanced.

[0014] In a fourth aspect of the present invention, the left high-pressure squeezing portion farthest from the central groove in the left diagonal groove and the right high-pressure squeezing portion farthest from the central groove in the right diagonal groove are arranged aligned in the longitudinal direction.

[0015] According to the above fourth aspect, the rigidity at the tips (ends away from the central groove) of the left diagonal groove and the right diagonal groove can be made symmetric left and right. Thereby, the left-right symmetry of the functions of the left diagonal groove and the right diagonal groove can be enhanced, so that the left-right symmetry of the deformation of the absorbent article can also be enhanced, and leakage prevention and wearing comfort are improved.

[0016] In a fifth aspect of the present invention, in the central groove, a plurality of first high-pressure squeezing portions spaced apart in the longitudinal direction along a first virtual wavy line extending in the longitudinal direction, and a plurality of second high-pressure squeezing portions spaced apart in the longitudinal direction along a second virtual wavy line extending in the longitudinal direction and intersecting the first virtual wavy line are formed. When the first high-pressure squeezing portions and the second high-pressure squeezing portions are projected onto a straight line parallel to the longitudinal direction, the projection ranges of the first high-pressure squeezing portions and the projection ranges of the second squeezing portions are alternately positioned.

[0017] According to the above fifth aspect, by forming high-pressure squeezing portions in a predetermined arrangement also in the central groove, even in the formation of the central groove, large fluctuations in the pressure received by the absorbent article can be suppressed, so that a stable operation of the roll pair can be maintained, and high-pressure squeezing portions can be accurately formed over the entire diagonal grooves and the central groove. Thereby, the function of the central groove, particularly the function of promoting the deformation of the absorbent article during wearing, can be improved. Further, since the high-pressure squeezing portions in the central groove are discontinuous in the longitudinal direction, the portion of the central groove does not become excessively hard, and it becomes easy to bend the absorbent article along the roundness in the front-rear direction of the body during wearing.

[0018] In a sixth aspect of the present invention, there is provided a method for manufacturing an absorbent article including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber provided between the top sheet and the back sheet, the absorbent article having a longitudinal direction and a lateral direction orthogonal to the longitudinal direction, the method including forming a central groove extending in the longitudinal direction, and forming a left diagonal groove and a right diagonal groove in a region on the end side in the longitudinal direction from the central groove such that the distance between the left diagonal groove and the right diagonal groove increases as they are farther from the central groove; in forming the left diagonal groove, forming a plurality of left high-pressure squeezing portions spaced apart in the extending direction of the left diagonal groove within the left diagonal groove; in forming the right diagonal groove, forming a plurality of right high-pressure squeezing portions spaced apart in the extending direction of the right diagonal groove within the right diagonal groove; and when the left high-pressure squeezing portions and the right high-pressure squeezing portions are projected onto a straight line parallel to the longitudinal direction, the projection ranges of the left high-pressure squeezing portions and the projection ranges of the right high-pressure squeezing portions are at least partially staggered from each other.

[0019] According to the sixth aspect described above, it is possible to provide a method for manufacturing an absorbent article that exhibits the same effects as those of the first aspect.

Advantages of the Invention

[0020] According to one aspect of the present invention, in view of the above points, one aspect of the present invention is an absorbent article in which spaced high-pressure squeezing portions are formed in a pair of left and right grooves provided on the skin side, and the high-pressure squeezing portions can be formed more reliably.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, unless otherwise specified, the same or corresponding components may be denoted by the same reference numerals and the description thereof may be omitted.

[0023] <Basic Structure of Absorbent Article> FIG. 1 shows a plan view of an absorbent article 1 according to one embodiment. Further, FIG. 2 shows a cross-sectional view taken along line I-I of FIG. 1, and FIG. 3 shows a cross-sectional view taken along line II-II of FIG. 1. As shown in FIGS. 1 to 3, the absorbent article 1 includes a liquid-permeable top sheet 3, a liquid-impermeable back sheet 2, and an absorber 4 disposed between both sheets, and is generally flat as a whole in the state before wearing (FIGS. 2 and 3). When the absorbent article 1 is worn, the top sheet 3 side becomes the side that touches the skin (skin side or front side), and the back sheet 2 side becomes the side that is fixed to the underwear (underwear side or back side). FIG. 1 is a view of the absorbent article 1 seen from the skin side.

[0024] The absorbent article 1 has an elongated shape in plan view, and has a longitudinal direction (front-rear direction) D1 and a lateral direction (width direction or left-right direction) D2 orthogonal to the longitudinal direction D1. When the absorbent article 1 is worn, the longitudinal direction D1 corresponds to the front-rear direction of the wearer's body, and the lateral direction D2 corresponds to the left-right direction of the wearer's body. In the form shown in FIG. 1, the absorbent article 1 has a shape that is substantially line-symmetrical with respect to a center line (a center line that bisects the absorbent article 1 in the lateral direction D2 or a longitudinal center line) CL extending along the longitudinal direction D1 in plan view, but the shape does not have to be line-symmetrical. Further, the configuration other than the shape of the absorbent article 1 (including the density, material, and size of the pressing portion of the absorber 4, etc.) may also be substantially symmetrical or asymmetrical with the center line CL as the axis of symmetry.

[0025] The backsheet 2 may be a sheet having at least water-blocking properties, and may be, for example, a sheet made of an 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 having substantially liquid-impermeable properties with a waterproof film interposed therebetween can be used. Further, it is more desirable to use a material having moisture permeability from the viewpoint of preventing stuffiness. As such a water-blocking and moisture-permeable sheet material, a microporous sheet obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching it in a uniaxial or biaxial direction can be used.

[0026] The topsheet 3 can be a sheet that can permeate body fluids such as urine, menstrual blood, and feces. As the topsheet 3, a porous or non-porous nonwoven fabric, a porous plastic sheet, or the like is preferably used. Examples of the material fibers constituting the nonwoven fabric include olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, regenerated fibers such as rayon and cupra, and blended fibers thereof, and natural fibers such as cotton can be used alone or in combination of two or more. Further, examples of the processing method of the nonwoven fabric include the spunlace method, the spunbond method, the thermal bond method, the meltblown method, and the needle punch method. Among these processing methods, the spunlace method is preferable in that it can produce a nonwoven fabric rich in flexibility, and the spunbond method is preferable in that it can produce a nonwoven fabric rich in drapability. The thermal bond method is preferable in that it can produce a bulky and soft nonwoven fabric. Further, composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers, in which fibers having a high melting point are used as the core and fibers having a low melting point are used as the sheath, can also be used.

[0027] The absorber 4 is not limited as long as it is a material capable of absorbing and holding body fluids, but preferably includes cotton-like pulp and a water-absorbing polymer. As the water-absorbing polymer, superabsorbent polymer (SAP) granules, superabsorbent fiber (SAF), and combinations thereof can be used. Examples of the pulp include those made of cellulose fibers such as chemical pulp obtained from wood, dissolving pulp, and artificial cellulose fibers such as rayon and acetate. As the raw material for chemical pulp, broad-leaved trees, coniferous trees, etc. are used, and coniferous trees are preferably used because of their long fiber length, etc.

[0028] Synthetic fibers may be mixed into the absorber 4. As the 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 can also be mixed and used. Also, composite fibers such as core-sheath fibers with a high-melting-point fiber as the core and a low-melting-point fiber as the sheath, side-by-side fibers, and split fibers can be used. In addition, those obtained by surface-treating hydrophobic fibers with a hydrophilic agent to impart affinity for body fluids can also be used. The absorber 4 is preferably manufactured by a stacking or air-laid method.

[0029] The absorber 4 may be one in which the main body portion of the absorber 4 is wrapped with a wrapping sheet made of crepe paper or non-woven fabric, etc. By providing the absorber 4 with a wrapping sheet, sagging and cracking of the absorber 4 can be prevented and the shape can be maintained. As the wrapping sheet, uncolored (i.e., white) crepe paper or non-woven fabric can be used, or those colored (e.g., colored with a color similar to or complementary to the color of body fluids) can also be used.

[0030] The absorber 4 may have an elongated shape with a substantially constant width as shown in FIG. 1 in plan view, but the width of the absorber 4 may vary along the longitudinal direction D1. As a whole, the absorber 4 may have a uniform thickness over the entire surface, but the thickness of the absorber 4 does not have to be uniform and may be locally thinner or thicker.

[0031] At both end edges in the longitudinal direction D1 of the absorber 4, the edge of the backsheet 2 and the edge of the topsheet 3 may be joined by an adhesive, heat sealing, etc. (illustrated by hatching in FIG. 1). Also, on both sides of the absorbent article 1, that is, on both sides in the lateral direction D2, a pair of side sheets 7, 7 may be arranged on the front side (topsheet 3 side) along the longitudinal direction D1.

[0032] The side sheet 7 may be composed of a non-woven fabric material that has been subjected to an appropriate water-repellent treatment or hydrophilic treatment according to the purpose of preventing the penetration of body fluids or improving the touch feeling. The material of the side sheet 7 may be natural fibers, synthetic fibers, recycled fibers, etc. Also, when the side sheet 7 is water-repellent treated, a water-repellent agent such as a silicone-based or paraffin-based agent can be used for the treatment. Note that the absorbent article may have a configuration in which the topsheet 3 extends to the end in the lateral direction D2 of the absorbent article 1 and is joined to the backsheet 2 without using the side sheet 7. Further, the side sheet 7 may be made into two layers on each side by folding back or adding a separate side sheet and overlapping them, and an elastic member such as a thread rubber is arranged so as to extend along the longitudinal direction in an extended state and intermittently fixed to form a rising gather portion. Then, for example, since the gather sheet 7 is fixed at the inner end or the outer end in the width direction D2, the rising gathers on both sides can cause the outer end or the inner end in the width direction D2 to rise toward the skin side when the extension of the elastic member is relaxed.

[0033] The absorbent article 1 has an intermediate region M that mainly corresponds to the wearer's crotch during wearing, a front region F that is adjacent to the intermediate region M in front and extends to the front end of the absorbent article 1, and a rear region R that is adjacent to the intermediate region M at the rear and extends to the front end of the absorbent article 1. The intermediate region M includes a body fluid discharge port facing region Q. The body fluid discharge port facing region Q is a region that faces the body fluid discharge ports such as the wearer's urethral orifice and vaginal orifice during wearing, and its center is on the longitudinal center line CL. In the example shown in FIG. 1, the body fluid discharge port facing region Q is depicted in an elliptical shape as a region corresponding to the urethral orifice, but the size and shape of the illustrated body fluid discharge port facing region Q are merely examples for explaining the absorbent article according to this embodiment.

[0034] In addition, when the absorbent article is individually packaged, the front region F and the rear region R can be folded back to the skin side in the longitudinal direction D1. In the example of FIG. 1, the folding of the front region F can be performed along a folding line along the boundary line between the front region F and the intermediate region M, and the folding of the rear region R can be performed along a folding line along the boundary line between the rear region R and the intermediate region M. Either the front region F or the rear region R can be folded first. By such folding, the absorbent article 1 can be folded into a three-fold or more fold.

[0035] The length (total length) of the absorbent article 1 in the overall longitudinal direction D1 is preferably 170 to 360 mm, more preferably 200 to 270 mm. The length of the absorbent article 1 in the lateral direction D2 (the width of the main body excluding the wing portion when provided with wings) is preferably 50 to 150 mm, more preferably 70 to 120 mm. Also, the width of the absorbent body 4 sandwiched between the top sheet 3 and the back sheet 2 can be 50 to 100 mm. Furthermore, the overall thickness of the absorbent article 1 is preferably 1 to 30 mm, more preferably 2 to 15 mm.

[0036] The absorbent article 1 shown in FIGS. 1 to 3 does not have wings, but the absorbent article 1 may have a pair of wings that extend laterally from both side edges of the intermediate region M. The wings can be formed by joining the extended portions of the side sheet 7 and the extended portions of the back sheet 2.

[0037] Further, on the backsheet 2 side of the absorbent article 1, a displacement prevention portion for surely fixing the absorbent article 1 with underwear during wearing to prevent displacement of the absorbent article 1 may be formed (not shown). The displacement prevention portion is preferably an adhesive displacement prevention portion. The adhesive displacement prevention portion is formed, for example, by applying an adhesive which is a fluid material or attaching a previously formed layer of an adhesive (such as an adhesive tape). As the adhesive used as the displacement prevention portion, a known adhesive, for example, a hot melt type adhesive can be used. Examples of its main components include styrene-based polymers, tackifiers, plasticizers, and combinations thereof.

[0038] <Groove on the skin side> On the skin side of the absorbent article 1, grooves that are recessed from the skin side to the non-skin side (that is, recessed from the topsheet 3 toward the backsheet 2) are provided. In the example shown in FIG. 1, the grooves include a central groove 11, a pair of diagonal grooves 12Lf, 12Rf formed in front of the central groove 11, and a pair of diagonal grooves 12Lr, 12Rr formed behind the central groove 11. However, either the pair of diagonal grooves 12Lf, 12Rf in the front or the pair of diagonal grooves 12Lr, 12Rr in the back may be omitted.

[0039] The grooves are preferably squeezing grooves formed by squeezing. The squeezing grooves can be formed by pressing a laminate including at least the topsheet and the absorbent body between a pair of rolls including an embossing roll having a convex portion corresponding to the shape of the squeezing groove on its outer peripheral surface and a flat roll having a flat outer peripheral surface. When the bottom of the groove has a high squeezing portion, the outer peripheral surface of the embossing roll may be provided with a convex portion for forming a low squeezing portion corresponding to the low squeezing portion which is a portion other than the high squeezing portion and a convex portion for forming a high squeezing portion protruding more than the convex portion for forming the low squeezing portion. The region where no squeezing groove is formed on the skin side of the absorbent article 1 is shown as the non-squeezing portion 14.

[0040] <Central groove> The central groove 11 is a groove formed along the longitudinal direction D1 at the center in the transverse direction D2 of the absorbent article 1. Since the central groove 11 is a groove that is recessed from the topsheet 3 side toward the backsheet 2 side, when the absorbent article 1 receives forces from both sides in the transverse direction D2 during wearing, the central portion in the transverse direction D2 is easily deformed so as to protrude toward the backsheet 2 side (non-skin side). The body fluid can be at least temporarily stored in the depression on the skin side formed by the protrusion. Further, when the central groove 11 is formed by pressing, the density of the region of the central groove 11 is higher than that of the non-pressed regions around the central groove 11, so that the body fluid is more likely to be retained in the central groove 11.

[0041] Since the central groove 11 extends along the longitudinal direction D1, it has a function of not only receiving and temporarily storing the body fluid as described above, but also guiding the body fluid in the longitudinal direction D1. Particularly, when the central groove 11 is formed by pressing, since the density of the region where the central groove 11 is formed is larger than the density of the non-pressed regions on both sides in its transverse direction D2, it becomes easier to guide the body fluid in the longitudinal direction D1 rather than in the transverse direction D2. By guiding the body fluid over the longitudinal direction D1, leakage of the body fluid in the transverse direction D2 can be prevented.

[0042] Further, the central groove 11 is preferably formed so as to overlap the body fluid discharge port facing region Q at the center in the transverse direction D2, and more preferably so as to overlap the longitudinal center line CL of the absorbent article 1. In the illustrated example, the center line extending along the longitudinal direction D1 of the central groove 11 (the line passing through the center of the width of the central groove 11) coincides with the longitudinal center line CL of the absorbent article 1.

[0043] The central groove 11 is preferably formed so as to include the intermediate region M of the absorbent article 1, and more preferably so as to include the body fluid discharge port facing region Q in the longitudinal direction D1. Further, the central groove 11 is preferably formed within the intermediate region M. Thereby, it becomes easier to fit the front region F and the rear region R of the absorbent article 1 along the roundness of the front and rear surfaces of the body.

[0044] The length of the longitudinal direction D1 of the central groove 11 (the length from the front end 11f to the rear end 11r) is preferably 50 to 160 mm, and more preferably 55 to 80 mm. By setting the length within the above range, body fluid can be sufficiently guided in the longitudinal direction D1, and at the same time, the formation of grooves near the center in the width direction D2 of the front region F and the rear region R can be avoided, making it easier to fit the front region F and the rear region R to the front and rear surfaces of the wearer's body.

[0045] The length (width) of the transverse direction D2 of the central groove 11 is preferably 3 to 15 mm, and more preferably 4 to 8 mm. By setting the length (width) within the above range, it becomes easier to store a large amount of body fluid in the central groove 11, and even if a strong force is applied from both sides in the transverse direction D2 and the central groove 11 is slightly deformed, the shape and function of the central groove 11 as a groove can be maintained.

[0046] <Oblique groove> In this embodiment, a pair of oblique grooves (left oblique groove and right oblique groove) are formed on the end side in the longitudinal direction D1 from the central groove 11. More specifically, a pair of left oblique grooves 12Lf and right oblique grooves 12Rf are formed in front of the central groove 11, and / or a pair of left oblique grooves 12Lr and right oblique grooves 12Rr are formed behind the central groove 11. This pair of oblique grooves extend outward in the longitudinal direction D1 from the end of the longitudinal direction D1 of the central groove 11 (toward the end of the longitudinal direction D1 of the absorbent article 101), and are formed such that the distance between them increases as they move away from the central groove 11. For example, the front left oblique groove 12Lf and the right oblique groove 12Rf are formed such that the distance between them increases as they move forward. The pair of left and right oblique grooves are preferably symmetric about the longitudinal center line CL as the symmetry line.

[0047] By forming paired left and right diagonal grooves in front of and / or behind the central groove 11, three-dimensional deformation of the absorbent article adapted to the shape of the wearer's body can be promoted. For example, regarding the front left diagonal groove 12Lf and right diagonal groove 12Rf, the region between the left diagonal groove 12Lf and the right diagonal groove 12Rf becomes wider toward the front, so it can follow the curved surface extending across the left and right near the pubis in the front of the body. And the front left diagonal groove 12Lf and right diagonal groove 12Rf become narrower as they approach the central groove 11 and gradually approach the central groove 11 in the lateral direction D2. Thus, the grooves naturally continue from the paired left diagonal groove 12Lf and right diagonal groove 12Rf to the central groove 11, facilitating deformation from the front region F to the middle region M. The same actions and effects are exhibited by the rear left diagonal groove 12Lr and right diagonal groove 12Rr. In the case of the rear left diagonal groove 12Lr and right diagonal groove 12Rr, the region between the left diagonal groove 12Lr and the right diagonal groove 12Rr can follow the roundness of the wearer's buttocks.

[0048] In the illustrated example, the left diagonal groove 12Lf and right diagonal groove 12Rf formed in front of the central groove 11 each extend continuously from the front end 11f of the central groove 11, but they do not necessarily have to be continuous. However, if the central groove 11 is continuous with the left diagonal groove 12Lf and right diagonal groove 12Rf, a clearer Y-shaped groove can be formed by the combination of the grooves. Using this Y-shaped groove as the axis (axis of the fold), deforming the absorbent article 1 makes it even easier to achieve three-dimensional deformation adapted to the shape of the wearer's body. The same applies to the left diagonal groove 12Lr and right diagonal groove 12Rr formed behind the central groove 11.

[0049] The width of the groove of each diagonal groove may be 1 to 4 mm. Also, the length of the diagonal groove in the longitudinal direction D1 may be 30 to 60% of the length of the central groove 11 in the longitudinal direction D1.

[0050] <High-pressure squeezing part> In this embodiment, at least in the diagonal grooves, a high-pressure squeezing portion, which is a portion squeezed deeper than the bottom surface of the groove, is formed. The high-pressure squeezing portion is shown in black in the drawings. When the diagonal grooves are formed by squeezing, the bottom surface of the diagonal grooves becomes a low-pressure squeezing portion. The low-pressure squeezing portion is a portion recessed by 1 to 10 mm, preferably 2 to 5 mm, from the non-squeezed region (non-squeezing portion 14), and the high-pressure squeezing portion may be a portion squeezed 0.2 to 1 mm deeper than the low-pressure squeezing portion in the diagonal grooves. In the following, the pair of diagonal grooves (left diagonal groove 12Lf and right diagonal groove 12Rf) in front of the central groove 11 will be mainly described, but the configurations and effects of the pair of diagonal grooves (left diagonal groove 12Lr and right diagonal groove 12Rr) behind the central groove 11 are the same.

[0051] FIG. 4 shows an enlarged view of a portion of the absorbent article 1 of FIG. 1 from the front diagonal grooves (left diagonal groove 12Lf and right diagonal groove 12Rf) to the central groove 11. As shown in FIG. 4, in the left diagonal groove 12Lf in plan view, a plurality of left high-pressure squeezing portions 25Lf, 25Lf,... are formed spaced apart in the extending direction or longitudinal direction D1 of the left diagonal groove 12Lf, and in the right diagonal groove 12Rf, a plurality of right high-pressure squeezing portions 25Rf, 25Rf,... are formed spaced apart in the extending direction or longitudinal direction D1 of the right diagonal groove 12Rf. By forming the high-pressure squeezing portions in the diagonal grooves, the grooves are reinforced, and when the absorbent article 1 is deformed during wearing, the left diagonal groove 12Lf and the right diagonal groove 12Rr can function well as the deformation axes. Further, since the high-pressure squeezing portions are formed discontinuously in the diagonal grooves, that is, spaced apart along the extending direction of the diagonal grooves, the flexibility of the groove portion can be ensured without becoming overly hard, and the front region F can be naturally curved in the longitudinal direction D1.

[0052] Such a left diagonal groove 12Lf having left high-pressure squeezing portions 25Lf, 25Lf,... and a diagonal groove 12Rf having right high-pressure squeezing portions 25Rf, 25Rf,... can be formed by a roll pair of an embossing roll and a flat roll as described above. The roll pair is preferably arranged such that its axial direction corresponds to the lateral direction (left-right direction) D2 of the absorbent article 1, and the absorbent article 1 is conveyed in the longitudinal direction D1. In that case, the left diagonal groove 12Lf and the right diagonal groove 12Rf are formed along the longitudinal direction D1.

[0053] Furthermore, in this embodiment, when the left high-pressure squeezing portion and the right high-pressure squeezing portion are projected onto a straight line parallel to the longitudinal direction D1, the projection ranges of the left high-pressure squeezing portion and the right high-pressure squeezing portion are at least partially staggered from each other. For example, as shown in FIG. 4, the projection ranges 26Lf, 26Lf,... obtained by projecting the left high-pressure squeezing portions 25Lf, 25Lf,... onto the longitudinal center line CL and the projection ranges 26Rf, 26Rf,... obtained by projecting the right high-pressure squeezing portion 25Rf onto the longitudinal center line CL are staggered from each other. Therefore, in the process of forming the grooves along the longitudinal direction D1, fluctuations in pressure, such as fluctuations that may occur when periods in which the left high-pressure squeezing portion 25Lf and the right high-pressure squeezing portion 25Rf are simultaneously formed and periods in which no high-pressure squeezing portion is formed repeatedly appear, are suppressed. Thus, stable operation of the apparatus (roll pair) can be maintained even under various groove forming conditions (roll pressure, conveyance speed, rigidity of the absorbent body before squeezing, etc.). As a result, along the longitudinal direction D1, the high-pressure squeezing portions 25Lf, 25Lf,... and 25Rf, 25Rf,... can be accurately formed at a desired arrangement and a desired squeezing depth. The ability to form the high-pressure squeezing portions at the desired arrangement and depth makes the functions of the left diagonal groove 12Lf and the right diagonal groove 12Rf more reliable, facilitates deformation of the absorbent article 1 along the shape of the body, and can prevent leakage and improve the wearing feeling.

[0054] In the example shown in FIG. 4, for all the left high-pressure squeezing portions 25Lf, 25Lf,... and the right high-pressure squeezing portions 25Rf, 25Rf,..., the projection ranges 26Lf, 26Lf,... and the projection ranges 26Rf, 26Rf,... are staggered from each other. However, in this embodiment, in at least a part of the entire diagonal groove, it is sufficient that the projection ranges 26Lf, 26Lf,... and the projection ranges 26Rf, 26Rf,... are staggered from each other. For example, in the left diagonal groove 12Lf and the right diagonal groove 12Rf, the number of high-pressure squeezing portions where the projection ranges 26Lf, 26Lf,... and the projection ranges 26Rf, 26Rf,... are staggered may be 80% or more, preferably 90% or more of the total number of high-pressure squeezing portions.

[0055] Also, in the configuration where the projection ranges 26Lf, 26Lf,... and the projection ranges 26Lf, 26Lf,... are staggered, since the pressing force of the roll pair is difficult to be dispersed left and right during the formation of the high-pressure squeezing portion, compared with the configuration where the left high-pressure squeezing portion and the right high-pressure squeezing portion are formed at the same position in the longitudinal direction D1, the linear pressure for forming the high-pressure squeezing portion becomes higher, and each high-pressure squeezing portion can be clearly formed.

[0056] The distance between the projection range 26Lf of the left high-pressure squeezing portion 25Lf and the projection range 26Rf of the right high-pressure squeezing portion 25Rf is preferably zero or the two projection ranges 26Lf, 26Rf overlap. In other words, it is preferable that the projection range 26Lf of the left high-pressure squeezing portion 25Lf and the projection range 26Rf of the right high-pressure squeezing portion 25Rf are not separated from each other. Thereby, in the formation process of the left diagonal groove 12Lf and the right diagonal groove 12Rf, the period during which the high-pressure squeezing portion is not formed disappears, so the pressure received by the absorbent article 1 becomes more uniform in the longitudinal direction D1, and the high-pressure squeezing portions 25Lf, 25Lf,... and 25Rf, 25Rf,... can be stably and surely formed.

[0057] The left high-pressure squeezing portions 25Lf, 25Lf,... may be arranged at equal intervals along the extending direction of the left oblique groove 12Lf. Similarly, the right high-pressure squeezing portions 25Rf, 25Rf,... may be arranged at equal intervals along the extending direction of the right oblique groove 12Rf. In the example shown in FIG. 4, the interval d2 between the right high-pressure squeezing portions 25Rf, 25Rf along the center line (partial arc-shaped curve) L of the groove width of the right oblique groove 12Rf is equal throughout the entire right oblique groove 12Rf. The same applies to the interval between the left high-pressure squeezing portions 25Lf, 25Lf. Thereby, the oblique grooves 12Lf, 12Rf can obtain the reinforcing effect of the oblique grooves by the high-pressure squeezing portions throughout their respective extending directions, and the flexibility of the oblique grooves can also be ensured throughout the extending directions. Note that d2 may be 1.5 to 2.5 mm, preferably 2.0 to 2.3 mm.

[0058] When the high-pressure squeezing portions are arranged at equal intervals along the extending direction of the oblique groove, the interval between the high-pressure squeezing portions along the longitudinal direction D1 is not necessarily uniform throughout the longitudinal direction D1. This is due to the fact that the oblique groove curves outward in the lateral direction D2 as it approaches the end in the longitudinal direction D1. For example, since the right oblique groove 12Rf curves outward in the lateral direction D2 as it goes forward in plan view, the interval d1 between the right high-pressure squeezing portions 25Rf, 25Rf along the longitudinal direction D1 is not uniform throughout the entire right oblique groove 12Rf and becomes smaller as it goes forward. In that case, the projection range 26Lf of the left high-pressure squeezing portion 25Lf and the projection range 26Rf of the right high-pressure squeezing portion 25Rf are in contact with each other at a position close to the center groove 11, but as they move away from the center groove 11, the two projection ranges 26Lf, 26Rf overlap in the longitudinal direction D1, and the overlap increases.

[0059] The above-described embodiment has advantages when a positional deviation error occurs in the lateral direction D2 of the absorbent article 1 in the groove forming step. The positional deviation error of the absorbent article 1 is likely to occur in the lateral direction D2 and the longitudinal direction D1, for example, when the absorbent article 1 rotates slightly. In particular, the positional deviation is larger in the region closer to the end of the longitudinal direction D1. Therefore, at a position close to the end of the longitudinal direction D1 of the absorbent article 1, the projection range 26Lf of the left high-pressure squeezing portion 25Lf and the projection range 26Rf of the right high-pressure squeezing portion 25Rf overlap. Even when a positional deviation error of the absorbent article 1 occurs, it is difficult for a gap to occur between the projection range 26Lf of the left high-pressure squeezing portion 25Lf and the projection range 26Rf of the right high-pressure squeezing portion 25Rf, or even if a gap occurs, it can be suppressed to be small. That is, for this reason, the present embodiment is suitable for an absorbent article having a long longitudinal direction D1 in which a positional deviation error is likely to occur in the groove forming step.

[0060] In the example shown in FIG. 4, the left high-pressure squeezing portions 25Lf, 25Lf,... are formed to have the same shape and size as each other, and the right high-pressure squeezing portions 25Rf, 25Rf,... are also formed to have the same shape and size as each other. The left high-pressure squeezing portion 25Lf and the right high-pressure squeezing portion 25Rf are also formed to have the same shape and size as each other. However, the shapes and sizes of the high-pressure squeezing portions may be different from each other within the left diagonal groove 12Lf and / or within the right diagonal groove 12Rf, or may be different between the left and right.

[0061] Further, the left high-pressure squeezing portions 25Lf, 25Lf,... and the right high-pressure squeezing portions 25Rf, 25Rf,... are formed in a dot shape, and the planar view shape of each high-pressure squeezing portion is circular. However, the planar view shape is not limited to a circle and can be an ellipse, a polygon, or any other arbitrary shape. The size of one of the left high-pressure squeezing portions 25Lf, 25Lf,... and the right high-pressure squeezing portions 25Rf, 25Rf,... may be a diameter of 1.2 to 2 mm when the planar view shape is circular, or a size having the same area when the planar view shape is other than circular.

[0062] <Modification Example> Fig. 6 shows a modified example of the high-pressure squeezing part. In the example shown in Fig. 6, the left high-pressure squeezing parts 25Lf, 25Lf,... of the left diagonal groove 12Lf and the right high-pressure squeezing parts 25Rf, 25Rf,... of the right diagonal groove 12Rf are formed at equal intervals along the longitudinal direction D1, respectively. That is, the interval d1 between the right high-pressure squeezing parts 25Rf, 25Rf along the longitudinal direction D1 is constant across the right diagonal groove 12Rf. On the other hand, the interval d2 between the right high-pressure squeezing parts 25Rf, 25Rf along the extending direction of the right diagonal groove 12Rf is not constant within the right diagonal groove 12Rf. The same applies to the intervals of the left high-pressure squeezing parts 25Lf, 25Lf,... of the left diagonal groove 12Lf.

[0063] Also in the modified example shown in Fig. 6, the projection ranges 26Lf, 26Lf,... of the left high-pressure squeezing parts 25Lf, 25Lf,... of the left diagonal groove 12Lf onto a straight line parallel to the longitudinal direction D1 and the projection ranges 26Rf, 26Rf,... of the right high-pressure squeezing parts 25Rf, 25Rf,... of the right diagonal groove 12Rf onto a straight line parallel to the longitudinal direction D1 are staggered. Furthermore, in this modified example, the projection range 26Lf of the left high-pressure squeezing part 25Lf is in contact with the projection range 26Rf of the right high-pressure squeezing part 25Rf adjacent in the longitudinal direction D1, and there is no range where no high-pressure squeezing part is formed when viewed in the longitudinal direction D1. Therefore, in the groove forming process, the pressure becomes uniform over the entire longitudinal direction D1, which is preferable in terms of stabilizing the behavior of the roll pair. Thus, this embodiment is suitable for an absorbent article having a short length in the longitudinal direction D1 where a positional deviation error is less likely to occur in the groove forming process.

[0064] Furthermore, FIGS. 6 and 7 show modified examples of the tip portions (the end portions on the end side in the longitudinal direction D1 of the absorbent article) of the diagonal grooves 12Lf and 12Rf. The left diagonal groove 12Lf and the right diagonal groove 12Rf shown in FIGS. 6 and 7 have the same basic configuration as those shown in FIG. 4, but the left high-pressure squeezing portions 25Lf, 25Lf,... The positions of the left high-pressure squeezing portion 25LfT at the most distal end and the right high-pressure squeezing portion 25RfT at the most distal end among the right high-pressure squeezing portions 25Rf, 25Rf,... are aligned. More specifically, the left high-pressure squeezing portion 25LfT and the right high-pressure squeezing portion 25RfT are formed such that the front edge in front of the left high-pressure squeezing portion 25LfT at the most distal end and the front edge in front of the right high-pressure squeezing portion 25RfT are located on a line EL parallel to the width direction D2.

[0065] As in the examples shown in FIGS. 6 and 7, by aligning the positions of the left high-pressure squeezing portion 25LfT at the most distal end and the right high-pressure squeezing portion 25RfT at the most distal end, the rigidity can be made more symmetrical between the left diagonal groove 12Lf and the right diagonal groove Rf, and the symmetry of the deformation of the absorbent article 1 during wearing can also be enhanced.

[0066] In the example shown in FIG. 6, in the left high-pressure squeezing portions 25Lf, 25Lf,... and the right high-pressure squeezing portions 25Rf, 25Rf,... formed in the same manner as in the example shown in FIG. 4, a right high-pressure squeezing portion 25RfT having the same shape and size as the right high-pressure squeezing portion 25Rf shown in FIG. 4 is added to the tip of the right diagonal groove 12Rf. In the example shown in FIG. 6, the shapes and sizes of the left high-pressure squeezing portions 25Lf, 25Lf,... including the left high-pressure squeezing portion 25LfT at the tip and the right high-pressure squeezing portions 25Rf, 25Rf,... including the right high-pressure squeezing portion 25RfT at the tip are the same.

[0067] The high-pressure squeezing portions formed at the tip ends of the diagonal grooves 12Lf and 12Rf tend to be formed deeper than other high-pressure squeezing portions when, for example, the absorber having a large thickness and being soft before squeezing has a non-squeezing portion that is not squeezed and is adjacent in the longitudinal direction D1. On the other hand, in the example shown in FIG. 6, the force of the roll pair can be dispersed left and right in the formation of the high-pressure squeezing portion at the very tip of the diagonal groove. Therefore, it is possible to prevent the left high-pressure squeezing portion 25LfT at the very tip and the right high-pressure squeezing portion 25RfT at the very tip from being formed excessively deep compared to the high-pressure squeezing portions at other positions.

[0068] In the example shown in FIG. 7, the left high-pressure squeezing portion 25LfT at the tip has a different shape from the other left high-pressure squeezing portions 25Lf, 25Lf, …, and the right high-pressure squeezing portion 25RfT at the tip also has a different shape from the other right high-pressure squeezing portions 25Rf, 25Rf, …. While the left high-pressure squeezing portions 25Lf, 25Lf, … and the right high-pressure squeezing portions 25Rf, 25Rf, … are circular, both the left high-pressure squeezing portion 25LfT at the tip and the right high-pressure squeezing portion 25RfT at the tip are elliptical. Also, the right high-pressure squeezing portion 25RfT at the tip is a longer ellipse along the extending direction of the right diagonal groove 12Rf. Further, in the example shown in FIG. 7, the widths (the lengths in the width direction of the diagonal grooves 12Lf and 12Rf) of the left high-pressure squeezing portion 25LfT at the tip and the right high-pressure squeezing portion 25RfT at the tip are both formed narrower than the other left high-pressure squeezing portions 25Lf, 25Lf, … and the other right high-pressure squeezing portions 25Rf, 25Rf, …. When the tendency for the left high-pressure squeezing portion 25LfT at the tip and the right high-pressure squeezing portion 25RfT at the tip to be formed deeper than other high-pressure squeezing portions is small, as shown in FIG. 7, the widths in the width direction D2 of the left high-pressure squeezing portion 25LfT at the tip and the right high-pressure squeezing portion 25RfT at the tip are made narrow, and the line pressure when the left high-pressure squeezing portion 25LfT at the tip and the right high-pressure squeezing portion 25RfT at the tip are formed can be made the same as the line pressure when the other left high-pressure squeezing portions 25Lf, 25Lf, … and the other right high-pressure squeezing portions 25Rf, 25Rf, … are formed.

[0069] <High-pressure squeezing portion in the central groove> In this embodiment, as shown in FIGS. 1 and 4, a high-pressure squeezing portion may also be formed in the central groove 11. Thereby, the rigidity of the central groove 11 and its surroundings is increased, and even when the legs receive force from both sides during wearing, it is possible to prevent the central groove 11 from being crushed. The form of the high-pressure squeezing portion in the central groove 11 is not particularly limited. However, as shown in FIG. 4, the high-pressure squeezing portion in the central groove 11 may have discontinuous first high-pressure squeezing portions 31, 31,... along a first virtual wave line WL1 extending in the longitudinal direction D1, and discontinuous second high-pressure squeezing portions 32, 32,... along a second virtual wave line WL2. The first virtual wave line WL1 and the second virtual wave line WL2 may have a regular pattern and may be formed symmetrically with respect to the longitudinal center line CL as a symmetry line.

[0070] The arrangement in the longitudinal direction D1 of the first high-pressure squeezing portions 31, 31,... and the second high-pressure squeezing portions 32, 32,... in the central groove 11 is not particularly limited. However, as shown in FIG. 4, it is preferable that the projection ranges obtained by projecting the first high-pressure squeezing portions 31, 31,... onto a straight line parallel to the longitudinal direction D1 (the longitudinal center line CL in the illustrated example) and the projection ranges obtained by projecting the first high-pressure squeezing portions 31, 31,... in the same manner are staggered from each other. Thereby, fluctuations in the pressure received from the roll pair in the groove forming process can be reduced, so that the high-pressure squeezing portion can be formed stably. Also, since the pressing force of the roll pair is not easily dispersed to the left and right, compared with a form in which the first high-pressure squeezing portions 31, 31,... and the second high-pressure squeezing portions 32, 32,... are formed at the same position in the longitudinal direction D1, the linear pressure for forming the high-pressure squeezing portion becomes higher, and each high-pressure squeezing portion can be clearly formed.

[0071] In the central groove 11, an area where the above-mentioned projection ranges of the first high-pressure squeezing portions 31, 31,... are in contact with each other, an area where both overlap each other, and an area where they are separated from each other may be included.

[0072] In the illustrated example, the first high-pressure squeezing portions 31, 31, ... and the second high-pressure squeezing portions 32, 32, ... are formed in circular shapes of the same size as each other. Also, the size of one of the high-pressure squeezing portions 25Lf, 25Lf, ... and 25Rf, 25Rf, ... in the diagonal grooves 12Lf, 12Rf may be larger than the size of one of the first high-pressure squeezing portions 31, 31, ... and the second high-pressure squeezing portions 32, 32, ... in the central groove 11. Thereby, it is possible to promote the deformation of the front and rear regions that need to be greatly bent when the absorbent article 1 is worn. When the size of the high-pressure squeezing portion in the central groove 11 is made smaller than the high-pressure squeezing portions in the diagonal grooves 12Lf, 12Rf, 12Lr, 12Rr, by providing a region where the projection range of the first high-pressure squeezing portions 31, 31, ... and the projection range of the first high-pressure squeezing portions 31, 31, ... overlap in the central groove 11, in the groove forming step, the difference between the linear pressure at the time of forming the high-pressure squeezing portion in the diagonal groove and the linear pressure at the time of forming the high-pressure squeezing portion in the central groove 11 can be reduced. Thereby, the difference in the depth of the high-pressure squeezing portion can be reduced between the central groove 11 and the diagonal grooves 12Lf, 12Rf, 12Lr, 12Rr, which is preferable.

[0073] As described above, the present invention has been described based on the embodiments, but the present invention is not limited by these embodiments. Also, within the scope described in the claims, various changes, modifications, substitutions, additions, deletions, combinations, etc. are possible, and these also belong to the technical scope of the present invention.

Explanation of Reference Numerals

[0074] 1 Absorbent article 2 Backsheet 3 Topsheet 4 Absorbent body 7 Sidesheet 11 Central groove 11f Front end of the central groove 11r Rear end of the central groove 12Lf Front left diagonal groove 12Rf Front right diagonal groove 12Lr Rear left diagonal groove 12Rr Rear right diagonal groove 14 Non-squeezing portion Left high-pressure squeezing part in front of 25Lf Left high-pressure squeezing part at the tip (the most forward) of 25LfT Right high-pressure squeezing part in front of 25Rf Right high-pressure squeezing part at the tip (the most forward) of 25RfT Projection range of the left high-pressure squeezing part in front of 26Lf Projection range of the right high-pressure squeezing part in front of 26Rf First high-pressure squeezing part 31 Second high-pressure squeezing part 32 Longitudinal center line CL First direction (longitudinal direction) D1 Second direction (lateral direction) D2 Front area F Middle area M Rear area R Area Q facing the body fluid discharge port First virtual wave line WL1 Second virtual wave line WL2

Claims

1. An absorbent article comprising a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorber provided between the topsheet and the backsheet, the absorbent article having a longitudinal direction and a lateral direction orthogonal to the longitudinal direction, wherein a groove recessed from the topsheet toward the backsheet is formed, the groove includes, a central groove extending in the longitudinal direction, and a left diagonal groove and a right diagonal groove formed in a region on the end side in the longitudinal direction from the central groove such that the distance between them increases as they are farther from the central groove, a plurality of left high-pressure squeezing portions are formed in the left diagonal groove at intervals in the extending direction of the left diagonal groove, and a plurality of right high-pressure squeezing portions are formed in the right diagonal groove at intervals in the extending direction of the right diagonal groove, when the left high-pressure squeezing portions and the right high-pressure squeezing portions are projected onto a straight line parallel to the longitudinal direction, the projected ranges of the left high-pressure squeezing portions and the projected ranges of the right high-pressure squeezing portions are at least partially staggered with each other, the left high-pressure squeezing portion at the tip of the left diagonal groove farthest from the central groove and the right high-pressure squeezing portion at the tip of the right diagonal groove farthest from the central groove are arranged aligned in the longitudinal direction, the left high-pressure squeezing portion at the tip is formed longer along the left diagonal groove than the left high-pressure squeezing portions other than the left high-pressure squeezing portion at the tip, and / or the right high-pressure squeezing portion at the tip is formed longer along the right diagonal groove than the right high-pressure squeezing portions other than the right high-pressure squeezing portion at the tip, the width of the left high-pressure squeezing portion at the tip is smaller than the width of the left high-pressure squeezing portions other than the left high-pressure squeezing portion at the tip, and the width of the right high-pressure squeezing portion at the tip is smaller than the width of the right high-pressure squeezing portions other than the right high-pressure squeezing portion at the tip, the absorbent article.

2. The absorbent article according to claim 1, wherein the interval between the projected range of the left high-pressure squeezing portion and the projected range of the right high-pressure squeezing portion adjacent to the projected range of the left high-pressure squeezing portion in the longitudinal direction is zero, or the two projected ranges overlap.

3. The absorbent article according to claim 1 or 2, wherein the intervals between the left high-pressure squeezing portions along the extending direction of the left diagonal groove are constant, and / or the intervals between the right high-pressure squeezing portions along the extending direction of the right diagonal groove are constant.

4. a plurality of first high-pressure squeezing portions spaced apart in the longitudinal direction along a first virtual wave line extending in the longitudinal direction are formed in the central groove, and a plurality of second high-pressure squeezing portions spaced apart in the longitudinal direction along a second virtual wave line extending in the longitudinal direction and intersecting the first virtual wave line are formed, When the first high-pressure squeezing portion and the second high-pressure squeezing portion are projected onto a straight line parallel to the longitudinal direction, the projection ranges of the first high-pressure squeezing portion and the second high-pressure squeezing portion are alternately positioned. The absorbent article according to any one of claims 1 to 3.

5. A method for manufacturing an absorbent article, comprising a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorber provided between the topsheet and the backsheet, having a longitudinal direction and a lateral direction orthogonal to the longitudinal direction, and having a groove recessed from the topsheet toward the backsheet. Form a central groove extending in the longitudinal direction. In a region on the end side in the longitudinal direction from the central groove, form a left diagonal groove and a right diagonal groove such that the distance between them increases as they are farther from the central groove. In the formation of the left diagonal groove, form a plurality of left high-pressure squeezing portions spaced apart in the extending direction of the left diagonal groove within the left diagonal groove. In the formation of the right diagonal groove, form a plurality of right high-pressure squeezing portions spaced apart in the extending direction of the right diagonal groove within the right diagonal groove. When the left high-pressure squeezing portion and the right high-pressure squeezing portion are projected onto a straight line parallel to the longitudinal direction, the projection ranges of the left high-pressure squeezing portion and the right high-pressure squeezing portion are at least partially alternately positioned. The left high-pressure squeezing portion at the tip of the left diagonal groove that is farthest from the central groove and the right high-pressure squeezing portion at the tip of the right diagonal groove that is farthest from the central groove are arranged aligned in the longitudinal direction. The left high-pressure squeezing portion at the tip is formed longer along the left diagonal groove than the other left high-pressure squeezing portions, and / or the right high-pressure squeezing portion at the tip is formed longer along the right diagonal groove than the other right high-pressure squeezing portions. A method for manufacturing an absorbent article, wherein the width of the left high-pressure squeezing portion at the tip is smaller than the width of the other left high-pressure squeezing portions, and the width of the right high-pressure squeezing portion at the tip is smaller than the width of the other right high-pressure squeezing portions.

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