JP2018050952A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which tightly contacts a skin of a wearer even when a fold line is provided for suppressing generation of a gap, and which can efficiently prevent liquid leakage from the gap.SOLUTION: One central fold line CFL formed by folding of an absorbent article 1 is formed on an intermediate part M or a rear part R. An absorber 4 on a rear part R positioned on a rear side of a vertical direction X of the central fold line CFL has a pair of rear slit areas RSr, RSl in which a rear slit R1 extending in the vertical direction X is arranged, on both sides sandwiching a virtual vertical central line CL. Each of the pair of rear slit areas RSr, RSl has one rear slit R1 or plural rear slits R1 arranged in a dispersed state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article such as a sanitary napkin.

  For absorbent articles such as sanitary napkins, in order to suppress the leakage of excrement such as menstrual blood, it is desired to deform along the wearer's body shape and adhere closely to the wearer's skin. ing. As a technique that can meet such a demand, a technique is known in which slits and openings are formed in a particularly rigid absorber among the constituent members of an absorbent article.

  The applicant firstly has a central slit region formed by dispersing vertical slits in the central part of the excretory part facing part of the absorber, and a rear slit extending in the lateral direction at the rear part of the absorber. An absorptive article having a rear slit region formed by being intermittently disposed on the surface is proposed (Patent Document 1). According to the absorbent article described in Patent Document 1, it is difficult for deep creases and twists to occur, the fit is improved, and the wearing feeling is improved. In addition, the vertical direction is a direction corresponding to the front and rear direction of the wearer of the absorbent article, and the horizontal direction is a direction orthogonal to the vertical direction.

  Further, Patent Document 2 has an absorptivity in which a plurality of non-penetrating slit portions are formed on one surface side of the absorber, and a recess is formed at a position corresponding to the slit portion on the other surface side of the absorber in the thickness direction. The article is listed. The plurality of slit portions have a linear shape extending in the lateral direction in plan view, and are distributed over the entire surface of the absorber. According to Patent Document 2, since it is possible to easily deform the absorbent body starting from a plurality of recesses, the absorbent body has sufficient flexibility as an absorbent article and can provide a comfortable wearing feeling. .

JP 2015-23999 A JP 2016-34598 A

  Generally used absorbent articles, for example sanitary napkins, are folded so that the topsheet is on the inside when not in use, so that the fold line remains in use. The sanitary napkin having such a fold line is difficult to adhere to the wearer's skin due to the influence of folds caused by the fold line, and is liable to cause inconveniences such as reduced fit and leakage due to liquid flow. There is. In particular, when the fold line formation position and the vicinity thereof have a relatively low rigidity, the crease is difficult to correct and the above-mentioned problem is likely to be manifested. Patent Documents 1 and 2 do not describe a problem caused by the existence of such a fold line or a solution to the problem.

  The subject of this invention is related with providing the absorbent article which can prevent a liquid leak effectively, even if there exists a fold line.

  The present invention has a longitudinal direction corresponding to the wearer's front-rear direction and a lateral direction perpendicular thereto, and comprises a liquid-retaining absorbent and a surface sheet disposed on the skin-facing surface side of the absorbent. The absorbent article is divided into a first area in the longitudinal direction and a second area in the rear, with one fold line formed by the folding as a boundary, The first region includes an intermediate portion including a portion facing the wearer's excretion portion when worn, and a front portion positioned longitudinally forward from the intermediate portion, and the second region is longitudinal from the intermediate portion. The absorber in the second region is a virtual longitudinal portion that extends in the longitudinal direction by dividing the absorber into two in the lateral direction and includes the rear slit region in which the longitudinal slit extending in the longitudinal direction is arranged. Providing absorbent articles that have a pair on both sides across the center line Is shall.

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which can prevent a liquid leak effectively is provided.

FIG. 1 is a plan view schematically showing a skin facing surface side (surface sheet side) of a sanitary napkin that is an embodiment of the absorbent article of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. 3 is a cross-sectional view schematically showing a cross section taken along line II-II in FIG. FIG. 4 is a plan view schematically showing the skin facing surface side of the absorbent body in the sanitary napkin shown in FIG. 1.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the preferable embodiment. The sanitary napkin 1 which is one Embodiment of the absorbent article of this invention is shown by FIGS. 1-3. As shown in FIG. 1, the napkin 1 corresponds to the wearer's front-rear direction, and has a longitudinal direction X extending from the wearer's abdominal side to the back side through the crotch portion, and a transverse direction Y orthogonal thereto. In addition, an intermediate part M including an excretion part facing part that is a part facing the excretion part (such as the vaginal opening) of the wearer when worn, and the front side (abdominal side) of the wearer in the longitudinal direction X from the intermediate part M And a rear portion R arranged behind the middle portion M in the longitudinal direction X, that is, on the rear side (back side) of the wearer. The excretory part-facing part of the intermediate part M is located in the central part in the lateral direction Y of the intermediate part M.

  As shown in FIG. 1, the napkin 1 includes a first region in the front in the vertical direction X and a second region in the rear with respect to one central fold line CFL formed by folding in the vertical direction X. The first region is composed of an intermediate portion M and a front portion F, and the second region is composed of a rear portion R. That is, the center fold line CFL forms a boundary between the intermediate part M and the rear part R. The center fold line CFL is formed by folding the napkin 1 in the vertical direction X with the top sheet 2 forming the skin facing surface facing inward (the back sheet 3 forming the non-skin facing surface facing outside). , A linear shape extending in the lateral direction Y. The center fold line CFL only needs to be formed at the center of the napkin 1 in the longitudinal direction X. Specifically, the center of the napkin 1 in the longitudinal direction X is used as a reference and the front side in the longitudinal direction X from the reference. Each region on the rear side is within 10% of the total length of the napkin 1 in the longitudinal direction X.

  As shown in FIG. 1, a rear fold line RFL formed by folding the napkin 1 is formed in the rear portion R of the napkin 1 behind the rear slit region RS described later in the longitudinal direction X. . Similarly to the center fold line CFL, the rear fold line RFL is formed by folding the napkin 1 in the vertical direction X with the surface sheet 2 forming the skin facing surface inside, and has a linear shape extending in the horizontal direction Y. There is no. The rear fold line RFL extends in the lateral direction Y between an outer groove 6 and an inner groove 7 described later. The rear fold line RFL is usually formed at a position spaced 10 to 30% of the total length of the napkin 1 in the vertical direction X from the rear end of the napkin 1 in the vertical direction X to the front side in the vertical direction X.

  As shown in FIG. 1, a front fold line FFL formed by folding the napkin 1 is formed in the front portion F of the napkin 1. Similarly to the center fold line CFL and the back fold line RFL, the front fold line FFL is also formed by folding the napkin 1 in the vertical direction X with the surface sheet 2 forming the skin facing surface inside, and the horizontal direction Y It has a straight line extending to The front fold line FFL is usually formed at a position spaced 10 to 30% of the total length in the vertical direction X of the napkin 1 from the front end in the vertical direction X of the napkin 1 to the rear side in the vertical direction X.

  As described above, the napkin 1 has a total of three folding lines including the front folding line FFL, the center folding line CFL, and the rear folding line RFL in order from the front side in the vertical direction X. Used when folded in the vertical direction X and individually wrapped. That is, the individual packaging form of the napkin 1 is a four-fold form with three fold lines.

  As shown in FIG. 1, the napkin 1 extends outward in the lateral direction Y from the absorbent main body 10 having a shape elongated in the vertical direction and both side portions along the vertical direction X of the intermediate part M in the absorbent main body 10. And a pair of wing portions 10W and 10W.

  The intermediate part M in the absorbent article of the present invention is a region divided by the center fold line CFL and the front end part of the wing part when the absorbent article has a wing part like the napkin 1, where The “front end portion of the wing portion” is a root on the front side in the vertical direction X of one wing portion 10W when the napkin 1 is taken as an example. That is, the intermediate portion M has a virtual straight line extending in the horizontal direction Y through the base at the front side of one wing portion 10W as a front end in the vertical direction X, and a central fold line CFL as a rear end in the vertical direction X. It is a continuous area. In the napkin 1, the pair of wing portions 10W, 10W are formed symmetrically with respect to the vertical center line CL extending in the vertical direction X by dividing the napkin 1 into the horizontal direction Y, and one wing portion. The base of the front side of 10W and that of the other wing portion 10W are in the same position in the vertical direction X.

  Moreover, the intermediate part M in the absorbent article (not shown) which does not have a wing part WHEREIN: This absorbent article produced when this absorbent article is folded by the individual packaging form is transverse (width direction, in the figure). The two fold lines crossing in the Y direction) mean a region surrounded by the first fold line and the second fold line as counted from the longitudinal front end of the absorbent article. This will be described with reference to FIG. 1. The front fold line FFL corresponds to the first fold line here, and the center fold line CFL corresponds to the second fold line here. That is, in the napkin 1 shown in FIG. 1, if there is no pair of wing portions 10W, 10W, the intermediate portion M of the napkin 1 that does not have the wing portion has the front fold line FFL at the front end in the vertical direction X. , And one continuous region with the center fold line CFL as the rear end in the vertical direction X.

  The napkin 1 includes a liquid-retaining absorbent body 4 and a surface sheet 2 disposed on the skin facing surface side of the absorbent body 4. More specifically, the absorbent main body 10 constituting the napkin 1 includes a top sheet 2 that forms a skin facing surface, a back sheet 3 that forms a non-skin facing surface, and an absorption interposed between both sheets 2 and 3. A body 4 is provided. The absorbent main body 10 is divided into three regions of a front part F, an intermediate part M, and a rear part R in order from the front side, that is, the wearer's front side in the longitudinal direction X. The longitudinal direction X coincides with the longitudinal direction of the napkin 1 and the absorbent main body 10, and the lateral direction Y coincides with the width direction orthogonal to the longitudinal direction of the napkin 1 and the absorbent main body 10.

  In the present specification, the “skin facing surface” is a surface of the absorbent article or its constituent member (for example, the absorbent body 4) that is directed toward the wearer's skin when the absorbent article is worn, that is, relative to the wearer's skin. The side close to the skin, and the “non-skin-facing surface” is the surface of the absorbent article or its constituent members that is directed to the side opposite to the skin side (clothing side) when the absorbent article is worn, that is, relatively worn The side far from the person's skin. In addition, "at the time of wearing" here means a state where a normal proper wearing position, that is, a correct wearing position of the absorbent article is maintained, and the absorbent article is in a state of being deviated from the wearing position. Is not included.

  As shown in FIGS. 2 and 3, the topsheet 2 covers the entire skin-facing surface of the absorbent body 4, and both side edges along the longitudinal direction X are both side edges along the longitudinal direction X of the absorbent body 4. It is in the same position. On the other hand, the back sheet 3 covers the whole area of the non-skin facing surface of the absorbent body 4 and further extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4 to be described later. A side flap portion 10 </ b> S is formed together with the forming sheet 5. The back sheet 3 and the leak-proof cuff forming sheet 5 are bonded to each other by known bonding means such as an adhesive, heat seal, ultrasonic seal, etc., at the extended portions from both side edges along the longitudinal direction X of the absorber 4. Has been. Moreover, the surface sheet 2 and the back surface sheet 3 are joined to each other by a known joining means at the extending portions from both ends in the longitudinal direction X of the absorber 4. The top sheet 2, the back sheet 3, and the absorbent body 4 may be joined by an adhesive. As the top sheet 2 and the back sheet 3, various kinds of materials conventionally used for absorbent articles such as sanitary napkins can be used without particular limitation. For example, as the surface sheet 2, a single layer or multilayer nonwoven fabric, an apertured film, or the like can be used. As the back sheet 3, a moisture-permeable resin film or the like can be used.

  As shown in FIG. 1, the side flap portion 10 </ b> S projects greatly outward in the lateral direction Y at the intermediate portion M, and thereby a pair of wings on both the left and right sides along the longitudinal direction X of the absorbent main body 10. The portions 10W and 10W are extended. The wing portion 10W has a substantially trapezoidal shape with a lower base (long side compared to the upper base) located on the absorbent main body 10 side in a plan view as shown in FIG. The wing part adhesion part (not shown) which fixes this wing part 10W to clothes, such as shorts, is formed. The wing portion 10W is used by being folded back to the non-skin facing surface, that is, the outer surface side of the crotch portion of clothes such as shorts. Further, the side flap portion 10S also protrudes outward in the lateral direction Y also in the rear portion R, whereby a pair of rear flap portions 10H, 10H is extended. The rear flap portion 10H is not folded when fixing it to the clothes, and is formed on the non-skin facing surface in a state where the non-skin facing surface is expanded, that is, extended to the side of the absorbent main body 10. It fixes to the skin opposing surface, ie, inner surface, of the clothes through the rear adhesive part (not shown). The wing part adhesive part and the rear adhesive part are covered with a release sheet (not shown) made of a film, a nonwoven fabric, paper, or the like before use.

  A pair of protections are provided so that both sides along the longitudinal direction X of the skin facing surface of the absorbent main body 10, that is, the skin facing surface of the topsheet 2, overlap with the left and right side portions along the longitudinal direction X of the absorbent body 4 in plan view. Leakage cuff forming sheets 5 and 5 are arranged over substantially the entire length in the longitudinal direction X of the absorbent main body 10. The pair of leak-proof cuff forming sheets 5 and 5 are joined to the top sheet 2 by a joining means 51 such as an adhesive at joining lines 51 extending in the longitudinal direction X, respectively. The inner edge located on the inside is a free end. The leakproof cuff forming sheet 5 may be, for example, folded back at the free end side and provided with a leakproof cuff forming elastic member extending in the longitudinal direction X inside the folded portion. When the leak-proof cuff forming elastic member is arranged in this way, a leak-proof cuff is formed in which the folded portion rises toward the wearer's skin due to the contraction force of the leak-proof cuff forming elastic member. . When the leak-proof cuff is formed in this way, it is possible to prevent side leakage of excretion fluid such as menstrual blood excreted on the skin facing surface of the napkin 1.

  The absorber 4 will be described. The absorber 4 contains a superabsorbent polymer and hydrophilic fibers. As the superabsorbent polymer, a particulate polymer is generally used, but a fibrous polymer may be used. When the particulate superabsorbent polymer is used, the shape thereof may be any of a spherical shape, a block shape, a bowl shape, and an amorphous shape. As the superabsorbent polymer, generally, a polymer or copolymer of acrylic acid or an alkali metal acrylate can be used. The hydrophilic fiber may be essentially a hydrophilic fiber, or may be a fiber obtained by hydrophobizing a hydrophobic fiber, but the former fiber is particularly preferable. Examples of the inherently hydrophilic fiber include natural fibers, cellulosic regenerated fibers, and semi-synthetic fibers. Preferred examples include pulp and rayon. In addition to wood pulp such as softwood kraft pulp and hardwood kraft pulp, pulp includes non-wood pulp such as cotton pulp and straw pulp, but is not particularly limited. Moreover, you may use the crosslinked cellulose fiber which bridge | crosslinked the molecule | numerator of the cellulose fiber and / or the molecule | numerator, and the bulky cellulose fiber obtained by carrying out the mercerization process of wood pulp.

  As shown in FIGS. 1 to 3, the absorbent body 4 in the napkin 1 includes a central absorbent sheet 41 that is disposed to face the excretion part of the wearer when worn, a portion that overlaps with the central absorbent sheet 41 in plan view, and a center. It is comprised including the main body absorbent sheet | seat 42 which has the part extended outward from the periphery of the absorbent sheet | seat 41, and is a laminated structure of a several sheet | seat. Both the absorptive sheets 41 and 42 contain a hydrophilic fiber and a superabsorbent polymer.

In the present invention, the term “absorbent sheet” means a sheet-like absorbent structure containing an absorbent material such as a superabsorbent polymer or hydrophilic fiber, and a stacked fiber formed by stacking an absorbent material. Differentiated. In general, the absorbent sheet is thinner and less rigid than the absorbent material stack, so the absorbent article provided with the absorbent sheet is thin and thin, flexible and comfortable to wear. Excellent, and it is also easy to handle by folding it compactly. From the viewpoint of more effectively utilizing the features of such an absorbent sheet and obtaining an absorbent article having sufficient liquid diffusibility and liquid retention and having a good wearing feeling, 5 cN / cm ² per absorbent sheet. The thickness under the load is preferably 0.1 mm or more, more preferably 0.3 mm or more, and preferably 2 mm or less, more preferably 1.5 mm or less. As the absorbent sheet, for example, those described in Japanese Patent No. 2963647 and Japanese Patent No. 2955223 can be used. Examples of preferable absorbent sheets include adhesive strength generated in wet superabsorbent polymers and binders such as adhesives and adhesive fibers added separately, and between constituent fibers and superabsorbent polymers. A sheet-like material is formed by bonding the gaps.

  As shown in FIG. 1, the central absorbent sheet 41 is arranged in the middle part of the intermediate part M or the middle part M of the intermediate part M and the front part F near the middle part M in the lateral direction Y of the napkin 1 or the absorbent main body 10. It is arranged. Further, the central absorbent sheet 41 has a multilayer structure formed by folding the sheet 41 as shown in FIG. The folded multilayer structure of the central absorbent sheet 41 includes two sheets extending in the longitudinal direction X through a position where the sheet 41 having a substantially rectangular shape in plan view divides the sheet 41 into approximately three equal parts in the lateral direction Y. The sheet 41 is formed in a so-called three-fold state by being folded on the same surface side (skin-opposing surface side) at a fold line.

  The main body absorbent sheet 42 also has a multilayer structure formed by folding the sheet 42 as shown in FIGS. 2 and 3. In the folded multilayer structure of the main body absorbent sheet 42, the sheet 42 having a substantially rectangular shape in plan view is folded on the same surface side (non-skin facing surface side) by two folding lines extending in the vertical direction X. And both end edges along the longitudinal direction X of the sheet 41 are formed by being overlapped at the center portion in the lateral direction Y, and the overlapping portion of the both end edges is a three-layer structure of the sheet 42, The portion other than the overlapping portion has a two-layer structure of the sheet 42. The folded multilayer structure of the main body absorbent sheet 42 forms the outer shape of the absorber 4.

  Thus, the absorbent body 4 in the napkin 1 has a configuration in which the folding structure of one central absorbent sheet 41 is included in the folding structure of one main body absorbent sheet 42. The middle part of the intermediate part M in the lateral direction Y has a middle and high part 43 which is thicker than the peripheral part and bulges to the skin facing surface side by the folding structure of the central absorbent sheet 41 being arranged. It has become. On the other hand, portions other than the middle and high portions 43 in the absorbent body 4 are configured to include the folding structure of the main body absorbent sheet 42 without the folding structure of the central absorbent sheet 41, and have a thickness that is larger than that of the middle and high portions 43. A small standard absorbing portion 44 is formed.

  As shown in FIG. 1, the middle-high portion 43 has a rectangular shape in a plan view, and is arranged in the center portion in the lateral direction Y of the intermediate portion M with its longitudinal direction coinciding with the longitudinal direction X. However, the plan view shape of the middle-high portion 43 can be arbitrarily selected and is not limited to a rectangular shape. The length of the middle and high portions 43 in the longitudinal direction X is preferably 60 mm or more, more preferably 80 mm or more, and preferably 150 mm or less, more preferably 120 mm or less. The length of the middle and high portions 43 in the lateral direction Y is preferably 25 mm or more, more preferably 30 mm or more, and preferably 55 mm or less, more preferably 50 mm or less.

  The thickness of the middle-high portion 43 in the absorbent body 4 is preferably 0.7 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 4 mm or less. By setting the thickness of the middle-high portion 43 in such a range, it becomes easy to achieve both a good wearing feeling and high absorption performance in the middle portion M where the middle-high portion 43 is formed. Moreover, when the absorbent article is provided with a wing part like the napkin 1, it becomes easy to suppress the twist of the absorber in the intermediate part M at the time of wearing. Moreover, the thickness of the standard absorption part 44 in the absorber 4 becomes like this. Preferably it is 0.3 mm or more, More preferably, it is 0.5 mm or more, Preferably it is 3 mm or less, More preferably, it is 2.5 mm or less. By making the thickness of the standard absorption part 44 into such a range, it becomes possible to further improve high absorption performance and followability to the movement of the wearer. The thickness of an absorber and an absorptive sheet is measured by the following method.

<Measurement method of thickness of absorbent sheet and absorber>
The absorbent sheet or absorbent body, which is the measurement object, is placed in a horizontal place so as not to be wrinkled or bent, and the thickness under a load of 5 cN / cm ² is measured. A thickness meter PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) Was used for measuring the thickness in the present invention. At this time, a circular plate or a square plate (acrylic plate having a thickness of about 5 mm) in a plan view is disposed between the tip of the thickness meter and the measurement portion of the measurement object, and the load is 5 cN / cm ² . Adjust the size of the plate so that

  A plan view as shown in FIG. 1 is formed on the skin facing surface of the rear part R of the napkin 1 as a groove in which the top sheet 2 and the absorber 4 are integrally recessed on the side opposite to the wearer's skin, that is, on the back sheet 3 side. , The outer groove 6 having a convex shape toward the rear end of the vertical direction X of the napkin 1, and the region surrounded by the outer groove 6, toward the rear end of the napkin 1 in the vertical direction X An inner groove 7 having a convex shape is formed. The grooves 6 and 7 are linear in a plan view. The term “linear” as used herein means that the shape of the groove, that is, the recessed portion is not limited to a straight line in a plan view but includes a curved line. The linear grooves 6 and 7 may be continuous lines or discontinuous lines such as broken lines. The “continuous line groove” mentioned here includes a form in which a deep groove portion having a relatively deep groove depth and a shallow groove portion having a relatively shallow groove depth are mixed. The “grooves of the discontinuous lines” include a form in which the concave portions and the non-concave portions, that is, flat portions of the surface sheet 2 are alternately arranged in the extending direction of the grooves. In this discontinuous groove, the length of the non-recessed portion in the extending direction of the groove, that is, the distance between the recessed portions is usually 5.0 mm or less. By the grooves 6 and 7, effects such as suppression of liquid diffusion in the planar direction of the absorbent body 4, particularly in the lateral direction Y, and prevention of twisting of the absorbent body 4 can be achieved. The grooves 6 and 7 can be formed in accordance with a conventional method by pressing with or without heat, or by embossing such as ultrasonic embossing. In the grooves 6 and 7, the topsheet 2 and the absorber 4 are integrated by heat fusion or the like, and the bottoms of the grooves 6 and 7 are higher in density than their peripheral parts.

  The outer groove 6 has a closed annular shape surrounding the middle and high portions 43 and the inner groove 7 in a plan view as shown in FIG. 1, and the napkin 1 or the absorber 4 is divided into two in the lateral direction Y and extends in the longitudinal direction X. It is formed symmetrically with respect to the center line CL. The outer groove 6 is continuous not only from the rear portion R but also from the front portion F through the intermediate portion M to the rear portion R. The inner groove 7 is located behind the middle and high portions 43 in the longitudinal direction X, is formed symmetrically with respect to the longitudinal center line CL, has a convex top at the rear end 70 of the longitudinal direction X, and The front end side, that is, the middle-high part 43 side is open.

  As shown in FIGS. 1 and 4, the absorber 4 in the rear portion R which is the second region has the rear slit regions RSr and RSl in which the rear slit R <b> 1 extending in the longitudinal direction X is disposed, and the absorber 4 in the lateral direction. A pair is provided on both sides across a virtual vertical center line CL that is bisected into Y and extends in the vertical direction X. One rear slit region RSr and the other rear slit region RSl are separated in the lateral direction Y.

  The rear slit R1 is a cut formed in the absorber 4, and the forming material of the absorber 4 is cut or separated from each other at a position where the rear slit R1 is formed. . In the napkin 1, the rear slit R1 has a linear shape in plan view, but the shape of the rear slit R1 in plan view is not limited to this and may be a wavy line or the like. Further, the rear slit R1 only needs to extend in the vertical direction X, and does not have to be parallel to the vertical center line CL as shown in the drawing. The angle formed with the vertical center line CL may be less than 45 degrees.

  In each of the pair of rear slit regions RSr, RSl, only one rear slit R1 is disposed, or a plurality of rear slits R1 are dispersedly disposed. In the napkin 1, as shown in FIGS. 1 and 4, four rear slits R1 are dispersedly arranged in each of the pair of rear slit regions RSr and RSl. When only one rear slit R1 is arranged in the rear slit regions RSr and RS1, the one rear slit R1 itself is the rear slit regions RSr and RSl. Further, when a plurality of rear slits R1 are dispersedly arranged in the rear slit regions RSr, RS1, the ranges of the regions RSr, RS1 are the rear slits R1 located at the forefront in the vertical direction X as shown in FIG. The length from the front end to the rear end of the rear slit R1 located rearmost is the longitudinal length, and from the inner edge of the rear slit R1 located innermost in the lateral direction Y to the outer edge of the rear slit R1 located outermost It is a range of a square in plan view, which is a lateral length.

  The number of rear slits R1 existing in each of the pair of rear slit regions RSr, RSl is not particularly limited, but is preferably 2 or more, more preferably 3 or more, and preferably 9 or less, more preferably 7 or less. is there.

  When each of the pair of rear slit regions RSr and RSl has a plurality of rear slits R1, the plurality of rear slits R1 may be the same in either one or both of the plan view shape and the inclination angle with respect to the longitudinal center line CL. It may be good or different. In addition, when each of the pair of rear slit regions RSr and RSl has a plurality of rear slits R1, the horizontal direction Y as shown in FIG. A pattern having two or more rear slits R1 having different positions is preferable.

  In the napkin 1, as shown in FIG. 4, the plurality of rear slits R1 in the rear slit regions RSr and RSl have the same shape in plan view and the inclination angle with respect to the longitudinal center line CL, and each rear slit R1 has a longitudinal center. A straight line extends parallel to the line CL. There are four rear slits R1 in each of the rear slit regions RSr and RS1, and the four rear slits R1 are arranged in a state of being distributed in both the vertical direction X and the horizontal direction Y, more specifically. Are arranged in a staggered pattern. Specifically, the staggered arrangement of the rear slits R1 in each of the rear slit regions RSr and RSl is formed as a slit row in which a plurality (two) of rear slits R1 are intermittently arranged in the vertical direction X, and the slits When a row is projected in the horizontal direction Y, a projected image of another rear slit R1 adjacent to the slit row in the horizontal direction Y is arranged between the projected images of the rear slit R1 constituting the slit row It is.

  As shown in FIG. 3, the rear slit R <b> 1 preferably penetrates through a laminate of absorbent sheets that constitute the absorbent body 4. Further, as shown in FIG. 3, the rear slit R <b> 1 is not formed in the top sheet 2 and the back sheet 3 disposed above and below the absorber 4, and is further between the top sheet 2 and the absorber 4. It is preferable that it is not formed also in the intermediate sheet which consists of a nonwoven fabric which may be arranged.

  As one of the main features of the napkin 1, as shown in FIGS. 1 and 4, 1) a pair of rear slit regions RSr and RSl are arranged on both sides of the longitudinal center line CL, and 2) a rear slit. The points where the regions RSr, RSl are arranged in the rear part R as the second region, that is, the points arranged behind the central fold line CFL, ie, the rear slit R1 in the rear slit regions RSr, RSl are folded in the center. The point which does not overlap with line CFL is mentioned.

  In a normal sanitary napkin, when a fold line such as the central fold line CFL in the napkin 1 is formed, the folds of the sanitary napkin are separated from the skin without being in close contact with the wearer's skin due to the crease and fit. There is a concern that the leakage prevention property will be insufficient. In particular, the formation position of the center fold line CFL on the napkin 1 is not a thick and rigid part like the middle and high portions 43, and therefore, folds caused by the center fold line CFL are likely to appear strongly, and the fit is reduced. Easy to manifest. However, since the napkin 1 is provided with the above 1) and 2), the portion sandwiched between the pair of rear slit regions RSr and RSl (the central portion in the lateral direction Y of the rear portion R) is worn when the napkin 1 is worn. Center fold line CFL from the rear end of the longitudinal direction X of the middle-high portion 43, which is a portion that tends to bend and deform along the groove (crack) of the wearer's buttocks and that tends to be particularly low in adhesion to the wearer's skin The extended region follows the deformation of the rear portion R and comes into close contact with the wearer's skin. Therefore, the napkin 1 is hardly in contact with the wearer's skin even though the center fold line CFL is formed, and can effectively prevent liquid leakage from the gap.

  In particular, by adopting the above 1), the slit between the pair of rear slit regions RSr, RSl in the absorber 4 (the central portion in the lateral direction Y of the rear portion R) is not formed. As a result, the flexible shaft in the rear portion R (particularly in the longitudinal direction X and in the vicinity thereof) is provided with higher rigidity than the rear slit regions RSr and RSl. , It is formed on the outer side in the lateral direction Y from the central portion in the lateral direction Y. Therefore, when the napkin 1 is worn, when a force that compresses the absorbent body 4 in the lateral direction Y is applied by the wearer's thigh, the center in the lateral direction Y sandwiched between the pair of rear slit regions RSr and RSl. A part protrudes with a surface toward a wearer's skin side, and comes to follow a wearer's crack planarly and stably. In addition, the rear slit regions RSr and RSl are arranged on both sides in the lateral direction Y of the portion that is bulged and deformed along the wearer's rupture in this way, and the rear slit region RSr. , Because the absorber 4 is divided by the rear slit R1 in RS1, diffusion of the excretory liquid in the surface direction, particularly diffusion in the lateral direction Y is suppressed, thereby effectively preventing liquid flow and leakage. Become so.

  Further, by adopting the above 2), the rear slit R1 in the rear slit regions RSr and RSl does not overlap with the central fold line CFL, and the rear slit R1 is formed at a position spaced apart from the central fold line CFL by a predetermined distance in the vertical direction X. Therefore, the lowering of rigidity due to the formation of slits (cuts) at the position where the center fold line CFL is formed and in the vicinity thereof is minimized, so that when the napkin 1 is worn, the center fold line CFL is positioned on the rear portion R side. Can be pushed up from the top, contributing to improved fit.

  The distance d1 between the pair of the rear slit regions RSr and RSl in the lateral direction Y is the narrowest distance d1 (see FIG. 4) from the viewpoint of more surely achieving the operational effects of the above 1) and 2). Is preferably 10 mm or more, more preferably 20 mm or more, and preferably 40 mm or less, more preferably 30 mm or less.

  From the same point of view, the distance d2 between the center fold line CFL and the rear slit areas RSr, RSl, that is, the distance between the center fold line CFL and the rear slit areas RSr, RSl and the rear slit R1 positioned at the forefront in the vertical direction X The distance d2 (see FIG. 4) is preferably 10 mm or more, more preferably 15 mm or more, and preferably 40 mm or less, more preferably 35 mm or less. In the actual product, the center fold line CFL usually has a predetermined length, that is, a width in the vertical direction X, and has a narrow strip shape in plan view wider than the thin line as shown. The distance d2 with respect to the center fold line CFL in the form of a strip is a distance between a pair of side end portions (front side end portion and rear side end portion) along the direction in which the center fold line CFL extends (lateral direction Y in the illustrated form). It means that the rear end located on the rear side in the vertical direction X is measured as the measurement position on the center fold line CFL side, that is, the rear end and the rear slit of the center fold line CFL. It means the distance to the areas RSr and RSl. When the center fold line is not a straight line parallel to the lateral direction Y as shown in FIG. 4, the distance d2 between the non-linear center fold line CFL and the rear slit regions RSr, RSl is the vertical center. This means that the rear end of the central fold line CFL located on the line CL is measured as the measurement position on the center fold line CFL side.

From the same viewpoint, it is preferable to set the dimensions and the like of each part of the rear slit R1 as follows.
The length L1 (see FIG. 4) in the longitudinal direction X of the rear slit R1 is preferably 10 mm or more, more preferably 15 mm or more, and preferably 35 mm or less, more preferably 25 mm or less.
The length Y or width b1 (see FIG. 4) in the lateral direction Y of the rear slit R1 is preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 1 mm or less, more preferably 0.8 mm or less. is there.
In the rear slit regions RSr and RS1, a plurality of rear slits R1 are arranged in a row in the vertical direction X, and the intervals in the vertical direction X of the rear slits R1 and R1 in the vertical slit row (the vertical direction in one rear slit region). D3 (see FIG. 4) is preferably 10 mm or more, more preferably 15 mm or more, and preferably 35 mm or less, more preferably 25 mm or less.
In the rear slit regions RSr and RSl, a plurality of rear slits R1 are arranged in a row in the horizontal direction Y, and the intervals in the horizontal direction Y of the rear slits R1 and R1 in the horizontal slit row (the horizontal direction in one rear slit region). The lateral distance between the rear slits closest to each other in FIG. 4) (see FIG. 4) is preferably 5 mm or more, more preferably 10 mm or more, and preferably 25 mm or less, more preferably 20 mm or less.

  In the napkin 1, as shown in FIG. 1, the outer groove 6 or the inner groove 7 and the rear slit R1 overlap in the rear portion R. That is, in plan view as shown in FIG. 1, at least a part of the plurality of rear slits R1 in the rear slit regions RSr and RSl overlaps the outer groove 6 or the inner groove 7 or both the grooves 6 and 7. With such a configuration, the bendability at the overlapping portion between the grooves 6 and 7 and the rear slit R1 is further enhanced, so the portion sandwiched between the rear slit regions RSr and RSl (the central portion in the lateral direction Y of the rear portion R) It can be raised more stably, and the shape change along the groove | channel (crack) of the buttocks of the wearer of the napkin 1 becomes possible still more effectively.

  The rear slit R <b> 1 (rear slit regions RSr, RSl) is preferably placed in the longitudinal direction X with the rear end 70 of the inner groove 7 in the vertical direction X, or positioned in front of the rear end 70 in the vertical direction X. In the napkin 1, the latter is adopted as shown in FIG. With such a configuration, the shape change of the inner groove 7 and the vicinity thereof for causing the inner groove 7 to follow the groove (crack) of the buttocks of the wearer of the napkin 1 can be expressed more effectively.

  In the napkin 1, as shown in FIGS. 1, 2, and 4, the absorber 4 has a central slit region MS in which a plurality of central slits M1 extending in the longitudinal direction X are dispersedly arranged in the intermediate portion M. . The central slit region MS exists so as to overlap the middle-high portion 43. Since the central slit region MS exists in the middle and high portions 43, even when a force that compresses the absorbent body 4 in the lateral direction Y is applied by the wearer's thigh when the napkin 1 is worn, the absorbent body 4 However, since it deforms finely at various parts of the central slit region MS, deep creases are unlikely to occur in the absorber 4 and the napkin 1. Therefore, it is possible to effectively prevent inconveniences caused by deep creases, for example, the wearer feels uncomfortable, the liquid flowing along the creases and leading to leakage. Therefore, according to the napkin 1, due to the action effect of both the central slit region MS and the rear slit regions RSr, RSl, it is difficult to form a gap due to close contact with the wearer's skin when worn, and liquid leakage from the gap is effectively prevented. Is prevented.

  The central slit M1 is a cut formed in the absorbent body 4, and the forming material of the absorbent body 4 is cut or separated from each other at a position where the central slit M1 is formed. . In the napkin 1, the central slit M1 has a linear shape in plan view, but the planar shape of the central slit M1 is not limited to this, and may be a wavy line or the like. Further, the central slit M1 only needs to extend in the vertical direction X, and does not have to be parallel to the vertical center line CL as shown in the figure, and only needs to have an angle of less than 45 degrees with the vertical center line CL. It is preferably less than 30 degrees, particularly preferably less than 10 degrees, and most preferably 0 degrees.

  The central slit region MS may have at least one central slit M1. The number of central slits M1 existing in the central slit region MS is not particularly limited, but is preferably 10 or more, more preferably 20 or more, and preferably 40 or less, more preferably 30 or less. When the central slit region MS includes a plurality of central slits M1, the plurality of central slits M1 may have the same or different one or both of the shape in plan view and the inclination angle with respect to the longitudinal center line CL. Also good. Further, when the central slit region MS has a plurality of central slits M1, the positions of the horizontal direction Y are different as shown in FIG. 4 rather than the pattern in which the central slits M1 are arranged in a line in the vertical direction X 2. A pattern having more than one central slit M1 is preferable.

The dimensions and the like of each part of the central slit M1 are preferably set as follows.
The length L2 (see FIG. 4) in the longitudinal direction X of the central slit M1 is preferably 10 mm or more, more preferably 15 mm or more, and preferably 35 mm or less, more preferably 25 mm or less.
The length Y or width b2 (see FIG. 4) in the lateral direction Y of the central slit M1 is preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 1 mm or less, more preferably 0.8 mm or less. is there.
In the central slit region MS, a plurality of central slits M1 are arranged in a row in the vertical direction X. The distance between the central slits M1 and M1 in the vertical slit row in the vertical direction X (closest to each other in the vertical direction in the central slit region). The vertical spacing between the central slits d5 (see FIG. 4) is preferably 10 mm or more, more preferably 15 mm or more, and preferably 35 mm or less, more preferably 25 mm or less.
In the central slit region MS, a plurality of central slits M1 are arranged in a row in the horizontal direction Y. The distance between the central slits M1 and M1 in the horizontal slit row in the horizontal direction Y (closest to each other in the horizontal direction in the central slit region). The horizontal distance between the central slits d6 (see FIG. 4) is preferably 5 mm or more, more preferably 10 mm or more, and preferably 25 mm or less, more preferably 20 mm or less.

  In addition, the distance d1 (see FIG. 4) between the pair of rear slit regions RSr and RSl having the narrowest distance in the lateral direction Y is the two central slits M1 and M1 adjacent in the lateral direction Y in the central slit region MS. Wider than the interval d6 (see FIG. 4) in the horizontal direction Y, and wider than the horizontal length of one region at the center in the horizontal direction when the middle and high portions 43 are equally divided into the horizontal direction Y. It is preferable. With such a configuration, when the napkin 1 is worn, the portion having the distance d1 (the central portion in the lateral direction Y of the rear portion R) can be more stably along with the wearer's cracks, thereby improving fit and extension. Therefore, the leakage prevention property can be further improved. The ratio between the distance d1 and the distance d6 is preferably 1.1 or more, more preferably 1.3 or more, and preferably 3 or less, more preferably 2.5 or less as the former / the latter. The ratio between the distance d1 and the lateral length of one central region in the middle and high portion 43 is preferably 1.5 or more, more preferably 2 or more, and preferably 6 or less as the former / the latter. Preferably it is 5 or less.

  In the napkin 1, as shown in FIG. 4, the plurality of central slits M1 in the central slit region MS have the same shape in plan view and the inclination angle with respect to the vertical center line CL, and each central slit M1 extends to the vertical center line CL. It extends straight in parallel. The plurality of central slits M1 in the central slit region MS are arranged in a state dispersed in both the vertical direction X and the horizontal direction Y, and more specifically, are arranged in a staggered manner. The staggered arrangement of the central slits M1 is the same as the staggered arrangement of the rear slits R1 described above.

  As shown in FIG. 2, it is preferable that the central slit M <b> 1 penetrates the laminated body of absorbent sheets constituting the absorbent body 4. Further, as shown in FIG. 2, the central slit M <b> 1 is not formed on the top sheet 2 and the back sheet 3 disposed above and below the absorber 4, and is further between the top sheet 2 and the absorber 4. It is preferable that it is not formed also in the intermediate sheet which consists of a nonwoven fabric which may be arranged.

  In the napkin 1, as shown in FIGS. 1 and 4, a part of the plurality of central slits M <b> 1 in the central slit region MS, more specifically, a center located at the end in the longitudinal direction X in the central slit region MS. The slit M1 straddles the rear end 43b of the middle-high portion 43 in the vertical direction X without overlapping the center fold line CFL. With such a configuration, when the napkin 1 is worn, the middle and high parts 43 can be easily deformed along the wearer's body, and the fit property and leakage prevention property of the napkin 1 can be further improved.

  In the napkin 1, the rear slit regions RSr and RSl are spaced apart from the central slit region MS in the longitudinal direction X by a certain distance or more. And the slit of the absorber 4 does not exist on the center fold line CFL. By doing so, the lowering of rigidity due to the formation of the central fold line CFL located between the central slit region MS and the rear slit regions RSr, RSl and in the vicinity thereof, the slit (cut) formation, is suppressed, As a result, when the napkin 1 is worn, the center fold line CFL can be pushed up from both the front and rear in the longitudinal direction X, and the fit can be further improved. From this point of view, the rear end of the central slit region MS (that is, the rear end of the central slit M1 located at the end of the longitudinal direction X in the central slit region MS) and the front ends of the rear slit regions RSr and RSl (that is, the rear slits). The distance d7 (see FIG. 1) from the rear slit R1 positioned at the forefront in the vertical direction X in each of the regions RSr and RSl is preferably 20 mm or more, and more preferably 25 mm or more. Further, if the separation distance d7 is too long, the effect of closely attaching the center fold line CFL to the skin is weakened, and there is a possibility that a gap between the napkin 1 and the skin is likely to be generated. Therefore, the upper limit of the separation distance S7 is preferably 40 mm, More preferably, it is 35 mm.

  Although the present invention has been described above, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention. For example, in the above-described embodiment, the absorbent body is composed only of the absorbent sheet, but may be composed only of the stacked body formed by stacking the absorbent material, and includes both. May be. However, the so-called thin conventional absorbent article, in which the absorbent body is composed only of the absorbent sheet, is often insufficient in the fit to the heel part, according to the present invention as described above, Since the fitting property with respect to the heel portion is improved, the present invention is particularly suitable for an absorbent article in which the absorbent body is composed only of the absorbent sheet. Moreover, the multilayer structure of the absorbent sheet in the absorbent body may be formed by folding a single absorbent sheet as in the above embodiment, or a plurality of absorbent sheets may be stacked without being folded. The configuration may be the same, or may be a configuration in which both configurations are combined.

  The present invention can be applied to all articles used for absorption of menstrual blood. Examples of such articles include, but are not limited to, panty liners and tampons in addition to sanitary napkins as in the above embodiment. The following additional notes are disclosed with respect to the embodiment of the present invention described above.

<1>
An absorbent article having a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction perpendicular to the longitudinal direction, and comprising a liquid-retaining absorbent and a surface sheet disposed on the skin-facing surface side of the absorbent Because
The absorbent article is divided into a first area in the longitudinal direction and a second area in the rear, with one fold line formed by the folding as a boundary,
The first region includes an intermediate portion including a portion facing a wearer's excretion portion at the time of wearing, and a front portion positioned longitudinally forward from the intermediate portion, and the second region is longer than the intermediate portion. Consisting of a rear part located at the rear of the direction,
The absorber in the second region has a pair of slits on both sides of a rear slit region in which a rear slit extending in the vertical direction is arranged, with a virtual vertical center line extending in the vertical direction by dividing the absorber into two in the horizontal direction. Absorbent article.

<2>
The absorber has a central slit region in which a plurality of central slits extending in the longitudinal direction are dispersedly arranged in the intermediate portion, and at a position spaced apart by 20 mm or more in the longitudinal direction from the longitudinal rear end of the central slit region, The absorbent article according to <1>, wherein a longitudinal front end of the rear slit region exists.
<3>
The length of the central slit in the longitudinal direction is 10 mm or more and 35 mm or less, preferably 15 mm or more and 25 mm or less.
<4>
The absorptive article given in <2> or <3> whose length of the transverse direction of said central slit is 0.1 mm or more and 1 mm or less, preferably 0.2 mm or more and 0.8 mm or less.
<5>
In the central slit region, a plurality of the central slits are arranged in a row in the vertical direction, and a vertical interval between the central slits in the vertical slit row is 10 mm or more and 35 mm or less, preferably 15 mm or more and 25 mm or less. The absorbent article according to any one of <2> to <4>.
<6>
In the central slit region, a plurality of the central slits are arranged in a row in the horizontal direction, and a horizontal interval between the central slits in the horizontal slit row is 5 mm or more and 25 mm or less, preferably 10 mm or more and 20 mm or less. The absorbent article according to any one of <2> to <5>.
<7>
The ratio of the interval of the narrowest portion in the lateral direction between the pair of rear slit regions to the interval in the lateral direction of the two central slits adjacent in the lateral direction in the central slit region is the former / the latter. The absorbent article according to any one of <2> to <6>, which is 1.1 or more and 3 or less, preferably 1.3 or more and 2.5 or less.

<8>
The absorbent body has a middle-high part that is thicker than the peripheral part and is raised on the skin facing surface side in the laterally central part of the intermediate part, and the central slit region exists in the middle-high part. The absorbent article according to any one of <2> to <7>.
<9>
The distance between the pair of the rear slit regions where the distance in the lateral direction is the narrowest is wider than the distance in the lateral direction between the two central slits adjacent in the lateral direction in the central slit region, and The absorbent article according to <8>, which is wider than the lateral length of one region at the center in the lateral direction when the middle and high parts are equally divided into 5 parts.
<10>
The ratio between the distance between the pair of the rear slit regions where the distance in the lateral direction is the narrowest and the lateral length of one region at the center in the lateral direction when the middle and high portions are divided in the lateral direction is the former / The absorbent article according to <8> or <9>, wherein the latter is 1.5 or more and 6 or less, preferably 2 or more and 5 or less.
<11>
Any one of <8> to <10>, wherein some of the plurality of central slits in the central slit region straddle the longitudinal rear end of the middle-high portion in the longitudinal direction without overlapping the folding line. Absorbent article as described in 1.
<12>
The length of the middle-high portion in the vertical direction is 60 mm or more and 150 mm or less, preferably 80 mm or more and 120 mm or less. The absorbent article according to any one of <8> to <11>.
<13>
The absorptive article given in any 1 of <8>-<12> whose length of the transverse direction of said middle high part is 25 mm or more and 55 mm or less, preferably 30 mm or more and 50 mm or less.
<14>
The absorbent body is composed of a central absorbent sheet formed of an absorbent sheet in the intermediate portion, and a main body absorbent sheet covering the central absorbent sheet, and the central absorbent sheet is formed in the middle and high portions. The absorbent article according to any one of <8> to <13>, which is arranged.
<15>
The absorbent article according to any one of <8> to <14>, wherein the absorber has a thickness of 0.7 mm to 5 mm, preferably 1 mm to 4 mm in the middle and high portions.
<16>
<8> to <15, wherein the absorber has a thickness of 0.3 mm or more and 3 mm or less, preferably 0.5 mm or more and 2.5 mm or less in a peripheral part (the standard absorption part) of the middle and high parts other than the middle and high parts. > Any one of>.

<17>
The absorbent article according to any one of <1> to <16>, wherein a rear fold line formed by folding the absorbent article is formed longitudinally rearward from the rear slit region.
<18>
In the rear portion, the topsheet and the absorbent body are convex toward the rear end in the longitudinal direction of the absorbent article in plan view as a linear groove that is integrally recessed on the side opposite to the wearer's skin. A convex outer groove and an inner groove located in a region surrounded by the outer groove and projecting toward the longitudinal rear end of the absorbent article. The absorbent article according to any one of <1> to <17>, in which an inner groove and the rear slit overlap.

<19>
The absorbent article according to any one of <1> to <18>, wherein an interval between a pair of the rear slit regions having a narrowest horizontal interval is 10 mm to 40 mm, preferably 20 mm to 30 mm. .
<20>
The absorbent article according to any one of <1> to <19>, wherein an interval between the central fold line and the rear slit region is 10 mm or more and 40 mm or less, preferably 15 mm or more and 35 mm or less.
<21>
The length in the longitudinal direction of the rear slit is 10 mm or more and 35 mm or less, preferably 15 mm or more and 25 mm or less. The absorbent article according to any one of <1> to <20>.
<22>
The absorptive article given in any 1 of <1>-<21> whose length of the transverse direction of said back slit is 0.1 mm or more and 1 mm or less, preferably 0.2 mm or more and 0.8 mm or less.
<23>
A plurality of the rear slits are dispersedly arranged in the rear slit region, and the plurality of rear slits have a vertical slit row in which the plurality of rear slits are arranged in a row in the vertical direction. The absorbent article according to any one of <1> to <22>, wherein a longitudinal interval between the rear slits is 10 mm to 35 mm, preferably 15 mm to 25 mm.
<24>
A plurality of the rear slits are arranged in a distributed manner in the rear slit region, and the plurality of rear slits has a horizontal slit row in which the plurality of rear slits are arranged in a row in the horizontal direction. The absorptive article given in any 1 of <1>-<23> whose interval of transverse direction Y of this back slit is 5 mm or more and 25 mm or less, preferably 10 mm or more and 20 mm or less.

<25>
The absorbent article according to any one of <1> to <24>, wherein the shape of the rear slit in plan view is a straight line, a wavy line, a curved line, or a broken line.
<26>
The absorbent article according to any one of <1> to <25>, wherein the rear slit has an angle with the virtual vertical center line of less than 45 degrees, preferably less than 30 degrees, and more preferably less than 10 degrees. .
<27>
The absorbent article according to any one of <1> to <26>, wherein the rear slit extends along the vertical direction.
<28>
A plurality of the rear slits are dispersedly arranged in each of a pair of the rear slit regions, and the plurality of rear slits are formed by arranging the rear slits in one row in the vertical direction, preferably two rows in the horizontal direction. As described above, the absorbent article according to any one of <1> to <26>, which has 3 or more rows.
<29>
The absorbent article according to <28>, wherein the number of the rear slits included in each of the vertical slit rows is one or more, preferably two or more.
<30>
The absorption according to any one of <1> to <29>, wherein a length in a lateral direction when the rear slit is viewed in plan is 0.1 mm or more and 1 mm or less, preferably 0.2 mm or more and 0.8 mm or less. Sex goods.

<31>
The absorbent article according to any one of <1> to <30>, wherein the absorbent body has a multilayer structure formed of an absorbent sheet.
<32>
The absorbent article according to <31>, wherein the multilayer structure is formed by stacking a plurality of the absorbent sheets, or formed by folding one absorbent sheet.
<33>
The absorbent article according to any one of <1> to <32>, wherein the absorbent article is a sanitary napkin.

  Hereinafter, the absorptive article of the present invention is explained still in detail by an example. However, the scope of the present invention is not limited by the examples.

[Example 1]
A sanitary napkin having the same basic configuration as that of the sanitary napkin shown in FIGS. 1 to 3 was produced and used as a sample of Example 1. The absorbent body in the produced sanitary napkin is the same as the absorbent body 4 shown in FIG. 4, and four rear slits are arranged in each of the pair of rear slit regions RSr and RSl. As the surface sheet, a spunbonded nonwoven fabric having a basis weight of 25 g / m ² was used. As the back sheet, a moisture-permeable resin film having a basis weight of 35 g / m ² was used. A spunbonded nonwoven fabric having a basis weight of 25 g / m ² was used as the leak-proof cuff forming sheet. As an absorptive sheet constituting the absorber, an absorptive sheet prepared according to Example 2 of Japanese Patent No. 2963647 is used, and the thickness under a load of 5 cN / cm ² per absorptive sheet is as follows. It was 0.5 mm. The thickness under the load of 5 cN / cm ² in the middle and high parts of the absorber was 2.3 mm, and the lateral width of the rear end part of the middle and high parts was 35 mm. Note that the middle and high portions of the absorber were rectangular in plan view.

Details of the slits arranged in the absorbent body in the sanitary napkin of Example 1 are as follows (see FIG. 4).
For each of the pair of rear slit regions RSr and RSl, the length L1 in the longitudinal direction X of the rear slit R1 is 20 mm, the width b1 of the rear slit R1 is 0.5 mm, and the rear slits R1 and R1 that are closest to each other in the longitudinal direction X The distance d3 in the vertical direction X was 20 mm, and the distance d4 in the horizontal direction Y between the rear slits R1, R1 closest to each other in the horizontal direction Y was 14 mm. Further, the distance d1 between the pair of rear slit regions RSr and RSl having the narrowest distance in the lateral direction Y was 24 mm.
Regarding the central slit region MS, the length L2 in the longitudinal direction X of the central slit M1 is 20 mm, the width b2 of the central slit M1 is 0.5 mm, and the longitudinal slits X in the longitudinal direction X between the central slits M1 and M1 that are closest to each other. The distance d5 was 20 mm, and the distance d6 in the horizontal direction Y between the central slits M1, M1 closest to each other in the horizontal direction Y was 12 mm.
The distance d2 between the rear end of the center fold line CFL and the rear slit R1 positioned in the forefront in the vertical direction X was 20 mm.

[Comparative Example 1]
A sanitary napkin having the same configuration as that of Example 1 was prepared in place of the absorber 4 shown in FIG. 4 except that an absorber having no rear slit was used, and this was used as a sample of Comparative Example 1.

[Evaluation]
About the sample (sanitary napkin) of each Example and a comparative example, the spreading distance of the bodily fluid was measured with the following method. The results are shown in Table 1 below.

<Measurement method of body fluid spread distance>
A human body model for the lower body of a woman capable of injecting liquid from the excretion point was used, and after placing the sample to be evaluated with the model upright, the model was placed on its back. Next, using a liquid discharge pump with a speed adjustment function, 3 g of horse blood was injected every minute from the excretion point, and a total of 6 g was injected. One minute after the injection of 6 g, the sample was removed from the model, and the longitudinal diffusion distance on the skin facing surface of each of the surface sheet and the absorber produced by the horse blood injection was measured three times. The average value of the three measurements for each absorber was calculated and used as the spread distance of the body fluid in the topsheet or absorber. In any of the surface sheet and the absorbent body, the shorter the spreading distance of this bodily fluid, the less the gap between the sanitary napkin and the wearer's skin, and it is considered that the bodily fluid is less likely to flow through the skin. It becomes evaluation.
As suspicious blood, defibrinated horse blood (manufactured by Nippon Biotest Co., Ltd.) was used.

  As shown in Table 1, the sanitary napkin of the example had a smaller body fluid spread distance on the top sheet and a body fluid spread distance on the absorbent body than the sanitary napkin of the comparative example. Therefore, the sanitary napkin of the example is less likely to have a gap between the skin and the fit during wearing, compared to the sanitary napkin of the comparative example, the fit is improved, and body fluid does not easily flow through the skin. Leakage can be expected to improve.

1 Sanitary napkin (absorbent article)
2 Front sheet 3 Back sheet 4 Absorber 41 Central absorbent sheet 42 Main body absorbent sheet 43 Middle and high part 44 Standard absorbent part 5 Leak-proof cuff forming sheet 6 Outer groove 7 Inner groove 10 Absorbent body F Front part (first region) )
M Middle part (first area)
R Rear part (second region)
FFL Front fold line CFL Center fold line RFL Back fold line M1 Center slit MS Center slit area R1 Back slit RSr, RSl Back slit area CL Vertical center line X Vertical direction Y Horizontal direction

Claims (7)

An absorbent article having a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction perpendicular to the longitudinal direction, and comprising a liquid-retaining absorbent and a surface sheet disposed on the skin-facing surface side of the absorbent Because
The absorbent article is divided into a first area in the longitudinal direction and a second area in the rear, with one fold line formed by the folding as a boundary,
The first region includes an intermediate portion including a portion facing a wearer's excretion portion at the time of wearing, and a front portion positioned longitudinally forward from the intermediate portion, and the second region is longer than the intermediate portion. Consisting of a rear part located at the rear of the direction,
The absorber in the second region has a pair of slits on both sides of a rear slit region in which a rear slit extending in the vertical direction is arranged, with a virtual vertical center line extending in the vertical direction by dividing the absorber into two in the horizontal direction. Absorbent article.   The absorber has a central slit region in which a plurality of central slits extending in the vertical direction are dispersedly arranged in the intermediate portion, and at a position spaced apart by 20 mm or more in the vertical direction from the vertical rear end of the central slit region, The absorbent article according to claim 1, wherein the longitudinal front end of the rear slit region exists.   The absorbent body has a middle-high part that is thicker than the peripheral part and is raised on the skin facing surface side in the laterally central part of the intermediate part, and the central slit region exists in the middle-high part. The absorbent article according to claim 2.   The distance between the pair of the rear slit regions where the distance in the lateral direction is the narrowest is wider than the distance in the lateral direction between the two central slits adjacent in the lateral direction in the central slit region, and The absorbent article according to claim 3, wherein the absorbent article is wider than the lateral length of one region at the center in the lateral direction when the middle and high parts are equally divided into 5 parts.   The absorbent article according to claim 3 or 4, wherein a part of the plurality of center slits in the center slit region straddles the longitudinal rear end of the middle-high portion in the longitudinal direction without overlapping the folding line. .   The absorptive article given in any 1 paragraph of Claims 1-5 in which the back fold line formed by folding of the absorptive article is formed in the longitudinal direction back from the back slit field. In the rear portion, the topsheet and the absorbent body are convex toward the rear end in the longitudinal direction of the absorbent article in plan view as a linear groove that is integrally recessed on the side opposite to the wearer's skin. A convex outer groove and an inner groove located in a region surrounded by the outer groove and projecting toward the longitudinal rear end of the absorbent article. The absorbent article according to any one of claims 1 to 6, wherein an inner groove and the rear slit overlap.

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