TWI738854B - Absorbent articles - Google Patents

Abstract

The absorbent body (4) of the absorbent article (1) of the present invention has a middle-high part (43) in the middle part (M). The absorber (4) has a rear slit region (RS) arranged with a rear slit (R1) extending in the longitudinal direction (X) on the rear side of the mid-high part (43). The rear slit region (RS) has a rear slit (R1) extending in the longitudinal direction (X). A pair of rear slit regions (RS) are arranged on both sides with a longitudinal center line (CL) in between. The rear slit (R1) is arranged at the position closest to the mid-high part (43) and located closest to the inner side of the transverse (Y). The transverse (Y) interval (d1) between the adjacent slits (R1a, R1a) The width (b3) of the longitudinal (X) rear end (43B) of the middle and high portion (43) is the same as or wider than the width (b3) of the transverse (Y).

Description

Absorbent articles

The present invention relates to an absorbent article.

The applicant previously proposed an absorbent article which has a central slit area and a rear slit area. The central slit area is connected to the central part of the opposite part of the excretion part of the absorbent body, and longitudinal slits are dispersedly formed. The rear slit region is connected to the rear part of the absorber, and is intermittently arranged in the longitudinal direction and formed with a rear slit extending in the lateral direction (Patent Document 1). According to the absorbent article of Patent Document 1, deep wrinkles or wrinkles are less likely to be generated, the conformability is improved, and the wearing feeling is improved.

As a different technique from this, Patent Document 2 discloses the following absorbent article: From the viewpoint of extending and stabilizing the absorbent article in the gap between the wearer’s buttocks during use of the absorbent article, The rear part of the absorbent body is provided with an elongated through hole extending along the longitudinal center line of the article.

Prior art literature Patent literature

Patent Document 1: Japanese Patent Laid-Open No. 2015-23999

Patent Document 2: Japanese Patent Special Form No. 2005-512680

The present invention is an absorbent article which has a longitudinal direction corresponding to the front and back direction of a wearer and a transverse direction orthogonal to the longitudinal direction, and has an absorbent body, and has a front part, a middle part and a rear part along the longitudinal direction. The above-mentioned absorption system has a thickness of He is partly thick in the middle and high section. The absorbent system has a rear slit area arranged with a rear slit extending in the longitudinal direction on the rear side of the mid-high part. A pair of the rear slit region is arranged on both sides of the imaginary longitudinal center line that bisects the absorber in the lateral direction and extends in the longitudinal direction. Among the rear slits constituting a pair of the rear slit regions, the distance between the adjacent slits arranged closest to the mid-high part and located at the innermost side in the transverse direction is the same as the longitudinal rear end of the mid-high part The horizontal width is the same or greater than this width.

1: Menstrual sanitary napkin

2: Front sheet

3: Back sheet

4: Absorber

5: Sheets for forming leak-proof flanging

9: Slot

10: Absorbent body

10H: Rear wing

10H1: Adhesive part of rear wing

10S: Flank

10W: Wing

10W1: Wing part adhesion part

41: body absorbent sheet

42: Central absorbent sheet

43: Middle and High

43B: Rear end

91: The first horizontal rolling groove

92: Longitudinal rolling groove

93: 2nd transverse rolling groove

94: No. 3 rolling groove

b1: width

b2: width

b3: width

CL: Vertical centerline (imaginary vertical centerline)

d1: interval

d2: interval

d3: interval

d4: interval

d5: interval

F: Front

IL: imaginary line

L1: length

L2: length

M: middle part

M1: Central slit

M1a: Central slit

MS: Central slit area

R: Rear

R1a: Proximity slit

R1ar, R1al: Proximity to the slit

R1r, R1l: rear slit

RS: Rear slit area

RSr, RSl: rear slit area

X: portrait

Y: horizontal

Z: thickness direction

Fig. 1 is a plan view of a menstrual sanitary napkin, which is a preferred embodiment of the absorbent article of the present invention, viewed from the side facing the skin.

Fig. 2 is a schematic cross-sectional view taken along the line II-II of Fig. 1.

Fig. 3 is a schematic cross-sectional view taken along the line III-III of Fig. 1.

Fig. 4 is a plan view obtained by observing the absorber included in the menstrual sanitary napkin shown in Fig. 1 from the side facing the skin.

Fig. 5 is a plan view of the absorbent body of another embodiment included in the absorbent article of the present invention viewed from the skin-facing surface side.

The inventors of the present invention found that when the body is placed in a supine posture at bedtime, the normal night-use menstrual napkin is closer to the opposite part of the excretion part than the opposite part of the wearer’s liquid excretion part. It is easy to have gaps in the back. When a large amount of menstrual blood is excreted at one time, the menstrual blood will easily flow along the skin and cause leakage. In response to this kind of leakage, if the absorbent article of Patent Document 1 is worn, the conformability is improved by the rear slit area, so although it has a fixing effect, it may be higher in the absorber arranged in the central slit area. The difference in rigidity between the part and the part from the mid-to-high part to the rear slit constituting the rear slit area, which results in the difference between the absorbent article and the muscle Since gaps are generated between skins, the absorbent article of Patent Document 1 has room for improvement.

In addition, when the absorbent article described in Patent Document 2 is worn, the area behind the absorbent body deforms into a shape curved toward the wearer's skin starting from the through hole when worn, which may give the wearer a sense of discomfort.

Therefore, the subject of the present invention is to provide an absorbent article that can eliminate the above-mentioned shortcomings of the prior art.

Hereinafter, the absorbent article of the present invention will be described with reference to the drawings based on the menstrual sanitary napkin 1 (hereinafter also referred to as "sanitary napkin 1") as one of its preferred embodiments. The sanitary napkin 1 has a longitudinal direction X corresponding to the front and rear directions of the wearer and a lateral direction Y orthogonal to the longitudinal direction X, and has an absorbent body 4, and has a front portion F, a middle portion M, and a rear portion R along the longitudinal direction X. The sanitary napkin 1 shown in Figure 1 to Figure 3 is suitable for night-use sanitary napkins used at bedtime. Fig. 1 shows a plan view of the sanitary napkin 1 when viewed from the side facing the skin, and Figs. 2 and 3 show cross-sectional views of the sanitary napkin 1. Moreover, FIG. 4 shows the top view which looked at the absorber 4 with which the sanitary napkin 1 was equipped from the skin opposing surface side.

In this embodiment, as shown in FIGS. 1 to 3, the sanitary napkin 1 has an absorbent main body 10 having an absorbent body 4, a front sheet 2 and a back sheet 3 that sandwich the absorbent body 4. In other words, the absorbent body 10 has: a liquid-permeable front sheet 2 that forms a skin facing surface; a back sheet 3 that forms a non-skin facing surface; and an absorbent body 4 between the two sheets 2, 3 rooms. In this embodiment, the absorbent body 4 of the sanitary napkin 1 is formed of an absorbent sheet, and specifically, as shown in FIGS. 2 and 3, it has a structure in which a plurality of layers of absorbent sheets are stacked in the thickness direction. In the sanitary napkin 1, the absorbent body 4 formed of an absorbent sheet contains a super absorbent polymer and constituent fibers.

As shown in Fig. 1, the absorbent body 10 of the sanitary napkin 1 has: a middle portion M, which includes an excretion portion opposing portion arranged opposite to the wearer's excretion portion, that is, the vaginal opening when worn; and a front portion F, which It is arranged on the front side of the wearer more than the middle portion M; and the rear portion R is arranged on the back side of the wearer more than the middle portion M; and becomes a shape that is longer in the front-to-rear direction. The sanitary napkin 1 and the absorbent body 10 have a longitudinal direction X corresponding to the front and back direction of the wearer, a transverse direction Y orthogonal to the longitudinal direction X, and a thickness direction Z. That is, the absorptive main body 10 has a front part F, a middle part M, and a rear part R along the front-back direction, that is, the longitudinal direction X, and is divided in this order.

In addition, the sanitary napkin 1 is symmetrical with respect to the longitudinal center line CL, and the longitudinal center line CL is an imaginary bisecting line extending in the longitudinal direction X through the transverse Y center of the sanitary napkin 1.

In addition, in this specification, the skin facing surface is the sanitary napkin 1 or its constituent member (for example, the front sheet 2), which faces the wearer's skin when the sanitary napkin 1 is worn, and the non-skin facing surface is sanitary When the cotton 1 or its constituent members are worn on the sanitary napkin 1, the surface facing the side (clothing side) opposite to the skin side. In addition, the longitudinal direction X coincides with the longitudinal direction of the sanitary napkin 1 and the absorbent main body 10, and the lateral direction Y coincides with the width direction (the direction orthogonal to the longitudinal direction) of the sanitary napkin 1 and the absorbent main body 10.

In this embodiment, as shown in FIGS. 1 and 3, the sanitary napkin 1 has a pair of rear wings 10H, 10H in addition to the absorbent body 10, and the pair of rear wings 10H, 10H are attached to the absorbent body. The sexual body 10 is more rearward than the middle portion M, that is, the rear portion R, which respectively extends from both sides of the absorbent body 10 along the longitudinal direction X to the outer side of the lateral direction Y. In addition, in the sanitary napkin 1, as shown in FIGS. 1 and 2, there are a pair of wings 10W and 10W. Both sides of X extend toward the outer side of Y.

Furthermore, in the absorbent article of the present invention, the so-called intermediate portion M means that when the sanitary napkin 1 of the present embodiment has the wing portion 10W, the area having the wing portion 10W in the longitudinal direction X (by a wing portion The area between the root of 10W along the longitudinal direction X and the root of the other wing portion 10W along the longitudinal direction X). In addition, it means that in the case of an absorbent article without wings, it refers to the bending of the absorbent article in the transverse direction Y that occurs when the absorbent article is folded in a single package form The folding line (not shown) is the area enclosed by the first folding line and the second folding line counting from the front end of the absorbent article in the longitudinal direction X.

In the sanitary napkin 1 of this embodiment, as shown in FIGS. 1 to 3, the front sheet 2 covers the entire area of the skin facing surface of the absorbent body 4. On the other hand, the back sheet 3 covers the entire area of the non-skin facing surface of the absorbent body 4, and further extends from the side edges of the front sheet 2 along the longitudinal direction X to the outside of the transverse direction Y, and is protected from the following The sheet material 5 for forming a skip flanging forms the side flap part 10S together. The anti-leakage flanging forming sheet 5 and the back sheet 3 fixed on the skin-facing surface of the front sheet 2 are attached to the extending portion of the absorber 4 from the both ends of the longitudinal direction X. Sealing, ultrasonic sealing and other well-known joining means are joined to each other. Furthermore, each of the front sheet 2 and the back sheet 3 and the absorber 4 may be joined by an adhesive.

In the sanitary napkin 1, as shown in Figs. 1 to 3, the sheet 5 for forming the leak-proof flanging is arranged and fixed to the skin facing surface of the front sheet 2 arranged on the skin facing surface of the absorbent body 10 It is along both sides of the longitudinal X. Preferably, the sheet 5 for forming a leak-proof cuff is arranged and fixed over the entire length of the longitudinal direction X of the absorbent body 10 so as to overlap the left and right sides of the absorbent body 4 along the longitudinal direction X in a plan view. For the sheet 5 for forming a leak-proof flanging, for example, the free end side may be folded back, and an elastic member for forming a leak-proof flanging may be arranged inside the folded part formed after the folding back. If the elastic member for forming the leak-proof flanging is arranged in this way, the leak-proof flanging is formed in which the folded back portion rises toward the wearer's skin side by the contraction force of the elastic member for forming the leak-proof flanging. If the anti-leakage cuff is formed in this way, the side leakage of menstrual blood excreted to the opposite surface of the skin can be prevented.

In the sanitary napkin 1, as shown in FIG. 1, the side flaps 10S are largely protruded from the middle part M toward the outer side of the transverse direction Y, thereby extending a line on the left and right sides of the absorbent body 10 along the longitudinal direction X. On the wings 10W, 10W. In addition, as shown in FIG. 1, the side flaps 10S are largely protruded from the rear portion R toward the outer side of the lateral direction Y, thereby extending the left and right sides of the absorbent body 10 along the longitudinal direction X. A pair of rear wings 10H and 10H are provided.

The wing portion 10W is folded back toward the non-skin facing side of the crotch portion of clothing worn by the user such as shorts. In the sanitary napkin 1, as shown in FIG. 1, when viewed from above, the wings 10W have a substantially trapezoidal shape with a lower bottom (longer side than the upper bottom) located on the side of the absorbent body 10 along the longitudinal direction X. On the non-skin facing surface of the wing portion 10W, there is arranged a wing portion adhesive portion 10W1 as an anti-offset member for fixing the wing portion 10W (sanitary napkin 1) to clothing (not shown) worn on shorts, etc., by With the wing part adhesive part 10W1, when in use, the wing part 10W folded back toward the non-skin facing surface (outer surface) of the crotch part of the clothes worn can be adhered and fixed to the crotch part. The wing part adhesive part 10W1 is arranged to extend in the longitudinal direction X. In the sanitary napkin 1, the shape of the wing part adhesive part 10W1 is a long rectangle in the longitudinal direction X and extends parallel to the longitudinal center line CL. In addition, the non-skin facing surface of the absorbent body 10 also forms a body adhesive portion (not shown) useful for fixing the absorbent body 10 to clothing worn on shorts or the like.

The rear wing portion 10H is arranged on the side facing the skin of clothing such as shorts when worn. On the non-skin facing surface of the rear wing portion 10H, a rear wing portion adhesive portion 10H1 is arranged as an anti-offset member for fixing the rear wing portion 10H to clothing (not shown) worn on shorts, etc., by which the rear wing portion 10H The wing part adhesive part 10H1 allows the rear wing part 10H to be adhered and fixed on the skin facing surface (inner surface) of the clothes worn during use. The rear wing part adhesive part 10H1 is arranged to extend in the longitudinal direction X. In the sanitary napkin 1, the shape of the rear wing part adhesive part 10H1 is a rectangle that is longer in the longitudinal direction X and extends parallel to the longitudinal center line CL.

As shown in Figures 1 to 3, the sanitary napkin 1 has a front sheet 2 and a back sheet 3 sandwiching an absorbent body 4, and a front sheet 2 and an absorbent body 4 are integrated on the back sheet on the side facing the skin. The side of the material 3 has a groove 9 at the bottom. Specifically, the skin facing surface of the absorbent body 10 (the skin facing surface of the front sheet 2) is provided with a front sheet 2 and an absorbent body 4 integrally recessed toward the back sheet 3 side 线状的槽9。 Linear slot 9. Therefore, the groove 9 becomes a groove in which the density of each fiber constituting the top sheet 2 and the absorber 4 is higher than the density of the surrounding portion of the groove. The "linear" in the linear groove 9 means that the shape of the groove (recessed portion) is not limited to a straight line when viewed from above, but also includes a curved line. Furthermore, each line may be a continuous line or a discontinuous line such as a dotted line. For example, the groove 9 may also include a row formed by a plurality of non-continuous dot embossing.

In the sanitary napkin 1, when viewed from above as shown in FIG. 1, the groove 9 has: a first transverse pressing groove 91 extending in the transverse direction Y at the front part F and the rear part R respectively; and a longitudinal pressing groove 92 , It extends in the longitudinal direction X across the front part F, the middle part M and the rear part R on both sides of the sanitary napkin 1 in the longitudinal direction X. In the sanitary napkin 1, the first transverse pressing groove 91 of the front part F and the rear part R forms a convex curved shape toward the outside of the longitudinal direction X, and extends in the transverse direction Y. In the sanitary napkin 1, the first horizontal pressing groove 91 of the front part F, the one vertical pressing groove 92, the first horizontal pressing groove 91 of the rear part R, and the other vertical pressing groove 92 are connected to form Ring-shaped full-circle groove. In addition, in the sanitary napkin 1, the groove 9 is located in the front part F on the inner side of the longitudinal direction X than the first transverse pressing groove 91, and has a second transverse pressing groove 93 extending in the transverse direction Y. In addition, in the sanitary napkin 1, the groove 9 is located in the rear portion R and is surrounded by a pair of the longitudinal pressing grooves 92, 92 and the first lateral pressing groove 91 in the rear portion R, and has a side facing outward in the longitudinal direction X A protruding third rolling groove 94 extending on one side in a curved shape is formed. Furthermore, in the sanitary napkin 1, the second transverse pressing groove 93 and the third pressing groove 94 are not connected to the pair of vertical pressing grooves 92, 92 as shown in FIG. 1, but may be connected. The groove 9 formed in this way can suppress the diffusion of the body fluid flowing in the plane direction on the front sheet 2 and can effectively prevent the liquid from leaking around the sanitary napkin 1.

The absorbent system included in the absorbent article of the present invention has a middle-high part thicker than other parts on the skin-facing surface side of the middle part M. In the sanitary napkin 1 of the present embodiment, as shown in FIGS. 2 and 3, the absorbent body 4 is formed of an absorbent sheet, specifically, it becomes heavy in the thickness direction Z A structure with multiple layers of absorbent sheets. In the sanitary napkin 1, the absorbent body 4 formed of an absorbent sheet contains a super absorbent polymer and constituent fibers. One absorbent sheet constituting the absorber 4 has superabsorbent polymers and constituent fibers three-dimensionally dispersedly arranged. As the absorbent sheet, it is preferable to use the adhesive force generated by the super absorbent polymer in the wet state or the adhesive or adhesive fiber and other binders added separately to make the constituent fibers or the constituent fibers and the highly absorbent It is obtained by combining polymers and making them into a sheet shape. In addition, the term “absorbent sheet” refers to an absorbent body formed into a sheet shape, and is distinguished from absorbent bodies with a fiber-stacked structure generally obtained by stacking absorbent materials. As a representative of the absorbent sheet, the absorbent sheet described in Japanese Patent No. 2963647 or the absorbent sheet described in Japanese Patent No. 2955223 can be cited.

In the sanitary napkin 1, as shown in FIGS. 2 and 3, the absorber 4 has a multilayer structure formed of an absorbent sheet. Here, the multilayer structure formed above may be formed by stacking a plurality of absorbent sheets, may be formed by stacking one absorbent sheet, or may be formed by combining these absorbent sheets. In the sanitary napkin 1, as shown in FIG. 2, the absorbent body 4 includes a central absorbent sheet 42 formed of an absorbent sheet in the middle portion M, and a main absorbent sheet 41 covering the central absorbent sheet 42. That is, the absorbent body 4 of the sanitary napkin 1 has a multilayer structure including a main absorbent sheet 41 and a central absorbent sheet 42 and a middle-high part 43 is formed in the middle part M. As shown in FIG. The multi-layer structure of the absorbent body 4 of the sanitary napkin 1 has a structure in which a central absorbent sheet 42 is enclosed within the folded structure of a body absorbent sheet 41, and the central absorbent sheet 42 is arranged in the middle-high part 43 .

Preferably, in the sanitary napkin 1, as shown in FIGS. 1 to 3, the main body absorbent sheet 41 has a longer length (width) in the transverse direction Y than that of the sanitary napkin 1, and includes one sheet. The two sides of the main body absorbent sheet 41 along the longitudinal direction X are folded back toward the back sheet 3 side to form a two-layer structure, and the side edges along the longitudinal direction X are overlapped with each other in the center of the transverse direction Y to form The absorber 4 has an outer shape. The central absorbent sheet 42 includes one sheet having a rectangular shape in plan view, and becomes the central absorbent sheet A 3-layer structure with 42 folded in three in the horizontal Y. When the central absorbent sheet 42 is made into a three-layer structure, at the two bending lines crossing the central absorbent sheet 42 in the longitudinal direction X, the second bending line is counted from the free end in the transverse direction Y Bend toward the back sheet 3 side, and then bend toward the front sheet 2 side at the first bending line from the free end of the transverse direction Y, and place the free end of the transverse direction Y inside the 3-layer structure The way, folded into a spiral. In this way, the central absorbent sheet 42 has a three-layer structure obtained by folding in three spirals. The middle-high portion 43 is formed into a five-layer structure by sandwiching the central absorbent sheet 42 of the three-layer structure between the main absorbent sheet 41 of the two-layer structure. The mid-high portion 43 is formed only in the middle portion M, and is not formed in the front portion F and the rear portion R. As shown in Figures 2 and 3, the number of laminated sheets of the absorbent sheet constituting the absorber 4 around the middle and high portion 43 is two, while the number of absorbent sheets constituting the absorber 4 in the middle and high portion 43 is The number of laminated sheets is large, 5 sheets, and the thickness is larger than that of the middle and high part 43. Therefore, the middle-high part 43 becomes a raised part which protrudes toward the surface sheet 2 side (the skin facing surface side of the sanitary napkin 1) in the middle part M.

The average thickness per absorbent sheet is preferably 0.1 mm or more, particularly preferably 0.3 mm or more, more preferably 2 mm or less, and particularly preferably 1.5 mm or less. More specifically, in terms of obtaining an absorbent article that absorbs menstrual blood in four spots with an absorber and has a good wearing feeling, it is preferably 0.1 mm or more and 2 mm or less, particularly preferably 0.3 mm or more and 1.5 mm or less.

The thickness of the high portion 43 of the absorber 4 is preferably 0.7 mm or more, more preferably 1 mm or more, more preferably 5 mm or less, further preferably 4 mm or less, more specifically, preferably 0.7 mm or more and 5 mm or less, more preferably 1 mm or more and 4 mm or less. By setting the thickness of the middle-high part 43 in this range, it is easy to balance the good wearing feeling of the middle part M formed with the middle-high part 43 and high absorption performance. In addition, when the absorbent article is provided with wings like the sanitary napkin 1 of the present embodiment, it is easy to suppress wrinkles of the absorbent body in the middle portion M during wearing. In addition, the thickness of the surrounding part of the middle-high part 43 of the absorber excluding the middle-high part 43 is preferably 0.3 mm or more, more preferably 0.5 mm or more, more preferably 3 mm or less, and still more preferably 2.5 mm or less, More specifically, it is preferably 0.3 mm or more and 3 mm or less, and more preferably 0.5 mm or more and 2.5 mm or less. This range is preferable from the viewpoint of improving higher absorption performance and followability to the wearer's activities. In addition, the thickness of the absorber and the absorptive sheet was measured by the following method.

<Method for measuring thickness of absorbent sheet and absorber>

Place the absorbent sheet or absorbent body as the object to be measured in a horizontal position without wrinkles or bends, and measure the thickness under a load of ^{5 cN/cm 2.} The thickness measurement of the present invention uses a thickness gauge PEACOCK DIAL UPRIGHT GAUGE SR5-C (manufactured by OZAKI MFG.CO.LTD.). At this time, between the front end of the thickness gauge and the measurement part of the object to be measured, arrange a flat plate (acrylic plate with a thickness of about 5mm) in a plan view of a circle or square, and adjust the plate ^{so that the load becomes 5cN/cm 2} The size.

The absorbent system included in the absorbent article of the present invention has a rear slit region RS arranged with a rear slit R1 extending in the longitudinal X on the rear side in the longitudinal direction X relative to the mid-high portion 43. The rear slit region RS is a pair of the vertical center line CL which is a imaginary vertical center line extending in the vertical direction X which bisects the absorber 4 in the horizontal direction Y and is arranged on both sides. In the sanitary napkin 1 of the present embodiment, as shown in FIGS. 1 and 4, the absorbent body 4 is located on the rear side of the longitudinal direction X than the mid-high portion 43 of the middle portion M, and is provided with a pair of rear sides separated in the transverse direction Y The slit regions RSr, RS1, and each of the rear slit regions RSr, RS1 have a rear slit R1 extending in the longitudinal direction X. Here, as the shape of the rear slit R1 extending in the longitudinal direction X, it means that as long as it extends in the longitudinal direction X, it includes not only straight lines, but also wavy lines, curved lines, and dotted lines. In addition, the inclination angle of the slit R1 after extending in the longitudinal direction X includes not only the slit extending in parallel with the longitudinal center line CL extending in the longitudinal direction X, It also includes slits whose angles formed by an imaginary line extending parallel to the longitudinal centerline CL are less than 45 degrees. However, the inclination angle of the rear slit R1 is preferably less than 30 degrees, particularly preferably less than 10 degrees, and most preferably 0 degrees. Each rear slit region RS preferably has at least one such rear slit R1, more preferably has 2 or more and 18 or less, and particularly preferably has 4 or more and 14 or less. When each rear slit region RS has a plurality of rear slits R1, the shape and inclination angle of the rear slit R1 may be all the same, or may include a part of different slits, or all of them may be different Slit. When each rear slit region RS has a plurality of rear slits R1, in each rear slit region RS, the slit rows extending in the longitudinal direction X are preferably formed in two or more rows in the transverse direction Y, more preferably More than 3 lines. In addition, the number of rear slits R1 included in each slit row is preferably one or more, and more preferably two or more. In the sanitary napkin 1, as shown in FIG. 4, in each rear slit region RS, 3 rows of slits extending in the longitudinal direction X are formed in the transverse direction Y, and each of the slit rows includes the rear slit The number of R1 is 2. In the sanitary napkin 1, the slit rows arranged between the two slit rows are arranged closer to the high portion 43 side of the absorber 4 than the two slit rows to form a rear slit region RS.

In the sanitary napkin 1, as shown in FIGS. 1 and 4, the rear slit R1 that constitutes each of the pair of rear slit regions RSr and RS1 is arranged symmetrically with respect to the longitudinal center line CL to form a pair Rear slit area RSr, RSl. In addition, in the sanitary napkin 1, each rear slit region RS has a plurality of rear slits R1 whose shapes and inclination angles are all the same. In the sanitary napkin 1, each rear slit R1 extends in a straight line parallel to the longitudinal center line CL. In the sanitary napkin 1, the rear slits R1 extending linearly parallel to the longitudinal center line CL are arranged in a state of being dispersed in both the longitudinal direction X and the lateral direction Y to form the rear slit region RS. The rear slit R1 of the sanitary napkin 1 is arranged on the main body absorbent sheet 41 located around the middle height portion 43 of the absorbent body 4. The rear slit R1 only needs to penetrate at least one layer of the two-layer structure of the main body absorbent sheet 41. However, in the sanitary napkin 1, the rear slit R1 penetrates all the layers in the thickness direction Z of the main body absorbent sheet 41 of the two-layer structure.

In the sanitary napkin 1, as shown in FIG. 1, a pair of rear slit regions RSr and RS1 are formed in a pair of rear slits R1, which are arranged closest to the middle and high portion 43 and located closest to the inner side of the transverse direction Y The lateral Y interval d1 between the adjacent slits R1ar and R1al is the same as or greater than the lateral Y width b3 of the longitudinal X rear end 43B of the middle-high portion 43. Here, a pair of proximity slits arranged at a position closest to the mid-high portion 43 among the rear slits R1 constituting each rear slit region RS are, in other words, the rear slits are located on the foremost side and are spaced apart in the lateral direction Y There is a pair of slits in the ground. In addition, the interval d2 between the pair of rear slits R1r and R11 means the shortest interval in the horizontal Y interval between the pair of rear slits R1r and R11.

In the sanitary napkin 1, as shown in Figs. 1 and 4, the middle part M of the absorbent body 4 is provided with a middle-high part 43, so the conformability to the wearer's liquid excretion part is improved. Moreover, in the sanitary napkin 1, the interval d1 of the lateral Y between the pair of adjacent slits R1ar and R1al arranged in the absorbent body 4 is the same as or greater than the width b3 of the rear end 43B of the middle-high portion 43. Therefore, even if the body is lying on its back at bedtime, by applying force from both sides of the sanitary napkin 1, the part between the adjacent slit areas RSar and RSa1 of the absorbent body 4 is easily brought into close proximity. The slits R1ar and R1al bulge toward the wearer's side as the starting point. If the portion between the pair of adjacent slit regions RSar and RSa1 is curved toward the wearer as described above, it will not easily cause discomfort to the wearer and will not easily create a gap with the skin. As a result, The conformability is improved, body fluids are not easy to flow along the skin, and the leakage resistance is improved. From the viewpoint of further exerting this effect, it is preferable that the distance d1 between the pair of adjacent slits R1ar and R1al in the lateral direction Y be larger than the width b3 of the rear end 43B of the middle-high part 43.

From the viewpoint of further exerting the above-mentioned effects, the width b1 (see FIG. 4) of the rear slit R1 when viewed from above is preferably 0.1 mm or more, more preferably 0.2 mm or more, and more preferably 1 mm or less Below, it is more preferably 0.8 mm or less, more preferably 0.1 mm or more and 1 mm or less, and still more preferably 0.2 mm or more and 0.8 mm or less. From the same point of view, the length (longitudinal X length) L1 (see Figure 4) of the rear slit R1 when viewed from above is preferably 10mm or more, more preferably 15mm or more, more preferably 35mm or less, and more preferably It is 25 mm or less, more preferably 10 mm or more and 35 mm or less, and more preferably 15 mm or more and 25 mm or less.

From the viewpoint of further exerting the above-mentioned effects, when each of the rear slit regions RSr, RS1 has a plurality of rear slits R1, the distance between the rear slits R1 and R1 (width The directional interval) d3 is preferably 3mm or more, more preferably 5mm or more, more preferably 18mm or less, still more preferably 15mm or less, more preferably 3mm or more and 18mm or less, and more preferably 5mm or more and Below 15mm.

In the sanitary napkin 1, each of the pair of rear slit regions RSr and RS1 is located at the innermost side in the transverse direction Y. The rear slits R1r and R11 are located at a width greater than the transverse Y at the rear end of the middle-high part 43 in the longitudinal direction X. One area in the center of the 5-division time is more on the outer side of the horizontal Y. Therefore, it is easy to further exert the above-mentioned effects. In addition, the lateral Y interval d2 between one pair of rear slits R1r and R1l at the narrowest position in the lateral direction Y (refer to FIG. 1) is preferably greater than the lateral direction of the rear end 43B in the longitudinal direction X of the mid-high portion 43 When the width of Y is divided into 5 equal parts, the width of one area in the center is larger, and is more preferably larger than the width of one area in the center when the width of the rear end 43B of the middle and high part 43 is divided into three equal parts. . In addition, when a plurality of rear slits R1 constituting each rear slit region RS are arranged, one pair of rear slits R1r and R1l arranged at the position with the narrowest interval in the lateral direction Y is preferably a pair of adjacent slits. For slits R1ar and R1al with different slits, the distance d2 between the pair of rear slits R1r and R1l (refer to FIG. 1) is preferably narrower than the distance d1 between the pair of adjacent slits R1ar and R1al (refer to FIG. 1) . The interval d2 between the pair of rear slits R1r and R11 (see FIG. 1) means the shortest interval in the horizontal Y interval between the pair of rear slits R1r and R11.

Furthermore, in the sanitary napkin 1, the middle-high part 43 is formed by the rectangular central absorbent sheet 42, so the width b3 of the horizontal Y of the middle-high part 43 is constant. On the other hand, when the width of the lateral Y of the rear end of the middle-high portion 43 is smaller than that of the front side thereof, the width of the lateral Y between the pair of proximity slits R1ar and R1al is preferably the same as that of the above-mentioned middle-high When the portion 43 is divided into 5 parts in the longitudinal direction X, the maximum length of the lateral Y of the rearmost divided area on the rearmost side is the same or longer, and is preferably the first from the side adjacent to the rearmost divided area. The maximum length of the horizontal Y of two adjacent divided regions is the same or longer. Here, the above-mentioned "maximum length in lateral Y" means the distance between the mid-high portion 43 and the longest position in lateral Y when viewed from above. By doing so, it is easy to further exert the above-mentioned effects.

In addition, in the sanitary napkin 1, the distance between the rear slits R1r and R11 adjacent to each other in the transverse direction Y in the innermost position of the pair of rear slit regions RSr and RS1 in the transverse direction Y is greater than that in the transverse direction Y. The lateral Y distance between adjacent central slits M1 and M1 is long. Therefore, the middle-high part 43 is easily deformed along the middle part M, and in order to cushion the influence of the deformation, the rear part R is easily deformed. Therefore, it is easy to further exert the above-mentioned effects.

From the viewpoint of further exerting the above-mentioned effects, the distance d1 between the pair of proximity slits R1ar and R1al (refer to FIG. 1) is preferably 25mm or more, more preferably 30mm or more, and more preferably 55mm or less. It is preferably 45 mm or less, more preferably 25 mm or more and 55 mm or less, and more preferably 30 mm or more and 45 mm or less.

From the viewpoint of further exerting the above effect, when one of the pair of rear slits R1l, R1r and the pair of proximity slits R1ar, R1al are arranged at the position with the narrowest interval in the lateral direction Y, the pair of rear slits R1r The distance d2 between R11 (refer to Figure 1) is preferably 8mm or more, more preferably 15mm or more, more preferably 40mm or less, further preferably 30mm or less, and more preferably 8mm or more and 40mm or less, More preferably, it is 15 mm or more and 30 mm or less.

In addition, in the sanitary napkin 1, as shown in FIGS. 1 and 4, in addition to having a pair of rear slit regions RSr and RS1, the mid-high portion 43 also has a longitudinal X and a transverse Y, which are arranged in the longitudinal X. The central slit area MS of the central slit M1 extending upward. Here, the so-called central slit M1 extending in the longitudinal direction X is the same as the above-mentioned rear slit R1 extending in the longitudinal direction X and means that as its shape, as long as it extends in the longitudinal direction X, it includes not only straight lines but also wavy lines. , Dashed lines, and curved lines, etc., and mean that the inclination angle includes not only slits extending parallel to the longitudinal center line CL extending in the longitudinal direction X, but also imaginary lines extending parallel to the longitudinal center line CL. A slit whose angle is less than 45 degrees. However, the inclination angle is preferably less than 30 degrees, particularly preferably less than 10 degrees, and most preferably 0 degrees. The central slit area MS preferably has 10 or more and 40 or less such central slits M1, and more preferably has 20 or more and 30 or less such central slits M1. In the central slit region MS, the slit rows in which the central slits M1 extending in the longitudinal direction X are intermittently arranged in the transverse direction Y are preferably formed in 3 rows or more in the longitudinal direction X, more preferably 4 rows or more, and further Preferably it is 5 rows or more. In addition, the number of central slits M1 included in each slit row is preferably two or more, more preferably three or more. The plurality of central slits M1 constituting the central slit area MS may be slits of the same shape and inclination angle, may include a part of different slits, or may be all different slits.

In the sanitary napkin 1, when viewed in plan as shown in FIG. 1, the rear slit R1 that constitutes each rear slit region RS has a portion overlapping the groove 9. Preferably, in the sanitary napkin 1, one of the plural rear slits R1 constituting each rear slit region RS has a longitudinal pressing groove 92 or a third pressing groove arranged at the rear part R of the groove 9 94 overlapping part. If the rear slit R1 has a portion overlapping with the groove 9 as described above, the conformability of the sanitary napkin 1 is further improved by the synergistic effect of the groove 9 and the rear slit R1. Moreover, if the rear slit R1 has a portion overlapping the groove 9, at the overlapping portion, the front sheet 2 easily enters the absorber 4 from the rear slit R1 and flows to the front The body fluid on the face sheet 2 is easily absorbed by the absorber 4.

In the sanitary napkin 1, each rear wing portion 10H has an anti-offset member extending in the longitudinal direction X on its non-skin facing surface, that is, the rear wing portion adhesive portion 10H1. In addition, when viewed from a plan view as shown in FIG. 1, the rear slit R1 constituting each rear slit region RS is not arranged behind the longitudinal X rear end of the rear wing part adhesive part 10H1. In other words, in the sanitary napkin 1, the rear end of the rear slit R1, which is the most rearward in the longitudinal direction X, among the plural rear slits R1 constituting each rear slit region RS is located in the longitudinal direction X of the rear wing part adhesive part 10H1 The rear end is closer to the front of the longitudinal X. If the rear slit R1 is arranged in such a position to form the rear slit region RS, when the sanitary napkin is deformed along the wearer's body, the rear wing portion 10H is easily fixed to shorts and the like through the rear wing portion adhesive portion 10H1 For clothing, the generation of wrinkles caused by the rear slit R1 can be suppressed, and the leakage resistance is improved.

In the sanitary napkin 1, as shown in FIGS. 1 and 4, in addition to having a pair of rear slit regions RS, the middle and high portion 43 also has a center extending in the longitudinal direction X and the lateral direction Y. The central slit area MS of the slit M1. Therefore, the central slit area MS is easily deformed along the wearer's body by the central slit M1, the conformability of the sanitary napkin 1 is improved, and the leakproofness and wearing feeling are further improved.

From the viewpoint of further exerting the above-mentioned effects, the width b2 (refer to FIG. 4) of the central slit M1 when viewed from above is preferably 0.1 mm or more, more preferably 0.2 mm or more, more preferably 1 mm or less, and more preferably It is 0.8 mm or less, more preferably 0.1 mm or more and 1 mm or less, and more preferably 0.2 mm or more and 0.8 mm or less.

From the viewpoint of further exerting the above-mentioned effects, the length (longitudinal X length) L2 (see FIG. 4) of the central slit M1 when viewed from above is preferably 10 mm or more, more preferably 15 mm or more, and more preferably 35 mm or less, It is more preferably 25 mm or less, more preferably 10 mm or more and 35 mm or less, and still more preferably 15 mm or more and 25 mm or less.

From the viewpoint of further exerting the above-mentioned effects, the interval (widthwise interval) d4 between the closest central slits M1 and M1 is preferably 3 mm or more, more preferably 7 mm or more, and more preferably 20 mm or less, and further It is preferably 15 mm or less, more preferably 3 mm or more and 20 mm or less, and still more preferably 7 mm or more and 15 mm or less.

In the sanitary napkin 1, as shown in Figs. 1 and 4, in the middle and high part 43 of the middle part M of the absorbent body 4, the central slit M1 extending parallel to the longitudinal center line CL is set on both the longitudinal direction X and the lateral direction Y It is arranged in a state of being symmetrically dispersed in the direction with respect to the vertical center line CL to form a central slit region MS. The central slit M1 of the sanitary napkin 1 only needs to penetrate through the absorbent sheet of the five-layer structure constituting the mid-high part 43 of the absorbent body 4 (the main absorbent sheet 41 of the two-layer structure and the central absorbent sheet 42 of the three-layer structure) At least one layer is sufficient, but in the sanitary napkin 1, the thickness direction of the absorbent sheet of the 5-layer structure penetrates all the layers.

Moreover, like the sanitary napkin 1 shown in FIGS. 1 and 4, when the absorbent body 4 has a pair of rear slit regions RS and a central slit region MS, it is arranged at the longitudinal X rear end 43B of the middle-high part 43 Whether the upper slit constitutes the rear slit region RS or the rear slit R1 or the central slit M1 constitutes the central slit region MS is determined as follows. That is, in a plan view of the absorbent body 4, the imaginary line IL passing through the rear end 43B in the longitudinal direction X of the mid-high portion 43 and parallel to the transverse direction Y is used as a reference, and overlaps the slit to be judged with the rear end 43B of the mid-high portion 43 When the ratio ((BL/AL)×100) of the length (BL) of the longitudinal direction X of the slit to the total length (AL) of the slit is 10% or less, it is judged to constitute the rear slit area RS When the rear slit R1 is greater than 10%, it is judged to be the central slit M1 constituting the central slit area MS.

Moreover, in the sanitary napkin 1, as shown in FIGS. 1 and 4, when the sanitary napkin 1 is viewed from the lateral direction Y, the central slit M1 constituting the central slit area MS is located in the width direction of the central slit area MS ( Lateral Y) The central side and behind the central rearmost slit M1a on the side closest to the longitudinal X The end does not overlap the front end of the proximal slit R1a of each rear slit region RS. The longitudinal X interval d5 (refer to FIG. 4) between the rear end of the central rear slit M1a and the front end of the proximal slit R1a is preferably 20mm or less, more preferably 15mm or less, and more preferably 0mm or more and 20mm Hereinafter, it is more preferably 0 mm or more and 15 mm or less. If it is in this range, since force is applied from both sides of the sanitary napkin 1 during wearing, the portion between the one pair of the absorbent body 4 near the slits R1ar, R1al, and the pair of proximity slits R1ar, R1al, is easy to be The starting point is a curved bulge toward the side of the wearer.

The longitudinal X interval d5 between the rear end of the central rear slit M1a and the front end of the proximal slit R1a (refer to FIG. 4) is preferably longer than the length of the rear slit R1 (longitudinal X length) L1 (refer to FIG. 4) and At least one of the length (longitudinal X length) L2 (refer to FIG. 4) of the central slit M1 is short.

The forming materials of the respective constituent members of the sanitary napkin 1 of the above-mentioned present embodiment will be described.

As the front sheet 2 and the back sheet 3, the sheets etc. previously used in absorbent articles, such as a menstrual sanitary napkin, can be used without a restriction|limiting in particular. For example, as the top sheet 2, a single-layer or multilayer structure of non-woven fabric, or an apertured film, etc. can be used. In addition, as the back sheet 3, a moisture-permeable resin film or the like can be used. In addition, as a sheet for forming a leak-proof flanging, non-woven fabrics with higher water pressure resistance, such as spunbonded non-woven fabrics, spunbonded-meltblown-spunbonded laminated non-woven fabrics, etc. can be used.

As the superabsorbent polymer possessed by the absorber 4, a particulate one is usually used, but a fibrous one may also be used. In the case of using a particulate superabsorbent polymer, the shape may be any of spherical, block, bag, or indefinite shape. As the superabsorbent polymer, usually acrylic acid or acrylic acid alkali metal salt polymer or copolymer can be used. As an example, polyacrylic acid and its salt, and polymethacrylic acid and its salt are mentioned. As the polyacrylate or polymethacrylate, sodium salt can be preferably used. In addition, it is also possible to use the combination of acrylic acid or methacrylic acid with maleic acid, itaconic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, 2-(meth)acrylamide ethyl sulfonate A copolymer of acid, 2-hydroxyethyl (meth)acrylate or styrene sulfonic acid and other comonomers in the range that does not reduce the performance of the superabsorbent polymer.

Examples of constituent fibers included in the absorbent body 4 include synthetic fibers, cellulose fibers, and the like. As the synthetic fiber, for example, a thermoplastic fiber is preferable. As the thermoplastic fiber, for example, a single fiber formed using a single synthetic resin such as polyethylene, polypropylene, polyester, and polyurethane, or a synthetic resin formed using a composite of these two or more types, etc. Composite fiber. Examples of cellulose fibers include cross-linked cellulose fibers (pulp fibers) obtained by intra- or intermolecular cross-linking of cellulose with a suitable cross-linking agent, or those obtained by increasing the crystallinity of cellulose Regenerated cellulose fibers such as rayon fibers.

In the sanitary napkin 1, it is preferable that an adhesive is applied and fixed between the front sheet 2 and the absorber 4, and between the absorber 4 and the back sheet 3. The adhesive can be applied using a known mechanism, such as a slit coating gun, a spiral spray gun, a spray gun, or a spot gun. In the sanitary napkin 1, a spiral spray gun is preferably used for coating in a spiral shape. As the adhesive to be applied, for example, a hot melt adhesive is preferably used. The coating amount of the hot melt adhesive is preferably 1.5 g/m ² or more and 10 g/m ² or less.

As mentioned above, the present invention has been described based on its preferred embodiments, but the absorbent article of the present invention is not limited at all by the sanitary napkin 1 of the above-mentioned embodiment, and can be modified as appropriate.

For example, in the sanitary napkin 1, as shown in FIG. 4, in each rear slit region RS of the absorbent body 4, the slit rows extending in the longitudinal direction X are formed in 3 rows in the transverse direction Y, and each of the slit rows The number of rear slits R1 included is two, and like the absorber 4 shown in FIG. 5, in each rear slit area RS, the slit rows extending in the longitudinal direction X are formed with 3 in the transverse direction Y Row, the number of rear slits R1 included in the central slit row is two, and the number of rear slits R1 included in both sides of the central slit row becomes 1 strip. With regard to the absorbent body 4 shown in Fig. 5, it mainly explains the different components from the above-mentioned sanitary napkin 1. The same components are attached with the same symbols. And omit the description. The description of the absorbent body 4 shown in FIG. 4 is appropriately applied to the components that are not specifically described. As long as it is a menstrual sanitary napkin having the absorber 4 shown in FIG. 5, the same effect as the sanitary napkin 1 shown in FIG. 1 is exerted.

In addition, in the sanitary napkin 1, as shown in FIG. 3, the absorbent body 4 is formed of an absorbent sheet, but it may not be an absorbent sheet, but a core-clad material that contains pulp fibers deposited by fibers. The absorbent core is a fiber accumulation type absorber derived from the skin-facing surface and the non-skin-facing surface.

In addition, the absorbent article of the present invention may be sanitary pads (vaginal secretions pads) and the like in addition to menstrual napkins.

Regarding the above-mentioned embodiment of the present invention, the following absorbent articles are further disclosed.

<1>

An absorbent article, which has a longitudinal direction corresponding to the front and back directions of a wearer and a transverse direction orthogonal to the longitudinal direction, and has an absorbent body, and has a front part, a middle part, and a rear part along the longitudinal direction. The absorbent system is described above The skin facing side of the middle part has a middle-high part thicker than the other parts, and the absorbent system is located on the rear side than the middle-high part, and has a rear slit area arranged with a rear slit extending in the longitudinal direction, The rear slit area is a pair of rear slits that are arranged on both sides of the imaginary longitudinal center line that bisects the absorber in the lateral direction and extends in the longitudinal direction, forming a pair of the rear slit area The horizontal interval between the adjacent slits arranged closest to the middle-high part and located at the innermost side in the horizontal direction in the slit is the same as or greater than the horizontal width of the longitudinal rear end of the middle-high part.

<2>

The absorbent article as in the above item <1>, wherein the widthwise interval of the above-mentioned proximity slit is the same as or greater than the maximum horizontal length of the rearmost part when the above-mentioned mid-high part is divided into 5 parts in the vertical direction. long.

<3>

The absorbent article according to the above item <1> or <2>, wherein the absorbent system has a central slit area in the middle and high part, in which central slits extending in the longitudinal direction are dispersedly arranged in the longitudinal direction and the lateral direction.

<4>

The absorbent article of the above-mentioned <3>, wherein the absorbent article is viewed from the lateral direction, and the rear end of the central rearmost slit located on the most rear side among the central slits constituting the central slit area and each of the above-mentioned rears The front ends of the above-mentioned adjacent slits in the slit area do not overlap.

<5>

The absorbent article as in the above item <3> or <4>, wherein the lateral distance between the laterally adjacent rear slits located at the innermost side of each of the above-mentioned pair of rear slit regions is longer than the laterally adjacent ones The horizontal Y distance between the above-mentioned central slits.

<6>

The absorbent article according to any one of the above items <1> to <5>, wherein each of the pair of rear slit regions, the rear slit located at the innermost side in the transverse direction, is located at the longitudinal rear end of the middle and high part When the horizontal width is divided into 5 equal parts, the central area is more horizontally outside.

<7>

The absorbent article according to any one of the above <1> to <6>, wherein the absorbent article includes a front sheet and a back sheet sandwiching the absorbent body, and the front sheet and The absorbent body is integrated with a groove having a bottom on the back sheet side, and the absorbent article is viewed from above, and the rear slit constituting each of the rear slit regions has a portion overlapping the groove.

<8>

The absorbent article according to any one of the above <1> to <7>, wherein the absorbent article has an absorbent body, the absorbent body is provided with the absorbent body, and a front sheet and a back sheet sandwiching the absorbent body The absorbent body has a pair of rear wings extending from both sides of the absorbent body along the longitudinal direction toward the outer side of the transverse direction, and each of the aforementioned rear wings The non-skin facing surface has an anti-offset member extending in the longitudinal direction, and the absorbent article is viewed from above, and the rear slits constituting each of the rear slit regions are not arranged at the longitudinal rear end of the anti-offset member More to the rear.

<9>

The absorbent article according to any one of the above <1> to <8>, wherein the shape of the rear slit is a straight line, a wavy line, a curve or a dotted line.

<10>

The absorbent article of any one of the above <1> to <9>, wherein the angle formed by the rear slit and the imaginary longitudinal center line extending parallel to the longitudinal direction is less than 45 degrees, preferably less than 30 degrees, more preferably less than 10 degrees.

<11>

The absorbent article according to any one of the above <1> to <10>, wherein the above-mentioned rear slit extends in the longitudinal direction.

<12>

The absorbent article according to any one of the above items <1> to <11>, wherein in each of the above-mentioned rear slit areas, the slit rows extending in the longitudinal direction preferably have two or more rows in the transverse direction, more preferably there are More than 3 lines.

<13>

The absorbent article as in any one of the above items <1> to <12>, which is narrow at the back of each of the above In the slit area, the slit rows extending in the longitudinal direction preferably have 2 or more rows in the lateral direction, and more preferably 3 or more rows. Preferably, there are 2 or more.

<14>

The absorbent article according to any one of the above <1> to <13>, wherein the width of the rear slit when viewed from above is 0.1 mm or more and 1 mm or less, preferably 0.2 mm or more and 0.8 mm or less.

<15>

The absorbent article according to any one of the above <1> to <14>, wherein the longitudinal length of the rear slit when viewed from above is 10 mm or more and 35 mm or less, preferably 15 mm or more and 25 mm or less.

<16>

The absorbent article according to any one of the above items <1> to <15>, wherein when the pair of rear slit regions respectively have a plurality of the above rear slits, the rear slits are closest to each other in the lateral direction The horizontal interval is 3 mm or more and 18 mm or less, preferably 5 mm or more and 15 mm or less.

<17>

The absorbent article according to any one of the above items <1> to <16>, wherein the absorbent system has a central slit area in the middle and high part in which central slits extending in the longitudinal direction are dispersedly arranged in the longitudinal direction and the lateral direction, Among the central slits constituting the central slit area, the rear end of the rearmost slit and the front end of the proximal slit are viewed from the lateral direction, which is located on the laterally central side of the central slit area and located closest to the longitudinal rearward. Do not overlap.

<18>

The absorbent article of any one of the above <1> to <17>, wherein the longitudinal interval between the rear end of the central rearmost slit and the front end of the proximal slit is 0 mm or more and 20 mm or less, preferably 0mm or more and 15mm or less.

<19>

The absorbent article according to any one of the above <1> to <18>, wherein the above-mentioned absorbent system utilizes a multilayer structure formed by an absorbent sheet.

<20>

The absorbent article of the above item <19>, wherein the above-mentioned multilayer structure is formed by stacking a plurality of the absorbent sheets, or formed by stacking one absorbent sheet.

<21>

The absorbent article according to any one of the above <1> to <20>, wherein the absorbent body includes a central absorbent sheet formed of an absorbent sheet in the middle portion, and a main body covering the central absorbent sheet An absorbent sheet, and the central absorbent sheet is arranged in the above-mentioned mid-to-high part.

<22>

The absorbent article according to any one of the above <1> to <21>, wherein the thickness of the mid-high part of the absorbent body is 0.7 mm or more and 5 mm or less, preferably 1 mm or more and 4 mm or less.

<23>

The absorbent article according to any one of the above <1> to <22>, wherein the thickness of the surrounding part of the middle and high part of the absorbent body other than the above middle and high part is 0.3mm or more and 3mm or less, preferably 0.5mm Above and below 2.5mm.

<24>

The absorbent article as described in any one of <1> to <23> above, wherein the above-mentioned absorbent article It is a menstrual sanitary napkin.

[Example]

Hereinafter, the absorbent article of the present invention will be further described in detail with examples. However, the scope of the present invention is not limited in any way by this embodiment.

<Example 1>

A menstrual sanitary napkin having the same basic composition as the menstrual sanitary napkin shown in Figs. 1 to 3 having the absorbent body shown in Fig. 4 was produced, and this was used as the sample of Example 1. As the front sheet, a spunbonded non-woven fabric with a basis weight of 25 g/m ^{2 was used.} As the back sheet, a moisture-permeable resin film with a basis weight of 35 g/m ^{2 was used.} As the sheet for forming the leak-proof flanging, a spunbonded non-woven fabric ^{with a basis weight of 25 g/m 2 was used.} As the absorbent sheet constituting the absorbent body, it was produced in accordance with Example 2 of Japanese Patent No. 2963647. The average thickness of each absorbent sheet is 0.5mm, the thickness of the middle-high part of the absorbent body is 2.3mm, and the lateral width of the end after the middle-high part is 35mm. Furthermore, the middle and high parts are rectangular.

The details of the slits arranged in the absorber are as follows.

Regarding the rear slit R1 constituting each rear slit region RS, the width b1 is 0.5 mm, the length L1 is 20 mm, and the distance d3 between the closest rear slits R1 and R1 is 7 mm.

The distance d1 between the pair of proximity slits R1ar and R1al is 38 mm, and the distance d2 between the pair of rear slits R1r and R11 is 24 mm.

Regarding the central slit M1 constituting the central slit region MS, the width b2 is 0.5 mm, the length L2 is 20 mm, and the interval d4 between the closest central slits M1 and M1 is 6 mm.

The longitudinal X interval d5 between the rear end of the central rearmost slit M1a and the front end of the proximal slit R1a is 0 mm.

<Example 2>

A menstrual sanitary napkin having the same basic structure as the sample made in Example 1 except that the absorbent body shown in FIG. 5 was used instead of the absorbent body shown in FIG. 4 was made, and set as Example 2 sample. The details of the slits arranged in the absorber shown in FIG. 5 are as follows.

The middle-high portion 43 is rectangular, and the lateral Y interval d1 between a pair of adjacent slits R1ar and R1al of the absorbent body is 35 mm which is the same as the width b1 of the rear end 43B of the middle-high portion 43.

Regarding the rear slit R1 constituting each rear slit region RS, the width b1 is 0.5 mm, the length L1 is 20 mm, and the distance d2 between the closest rear slits R1 and R1 is 7 mm.

The distance d1 between the pair of proximity slits R1ar and R1al is 38 mm, and the distance d2 between the pair of rear slits R1r and R11 is 24 mm.

Regarding the central slit M1 constituting the central slit region MS, the width b2 is 0.5 mm, the length L2 is 20 mm, and the interval d4 between the closest central slits M1 and M1 is 6 mm.

The longitudinal X interval d5 between the rear end of the central rearmost slit M1a and the front end of the proximal slit R1a is 0 mm.

<Comparative Example 1>

Except that instead of the absorber shown in FIG. 4, an absorber obtained by removing a pair of rear slit regions RS from the absorber shown in FIG. 4 was used, and had the same basic structure as the sample made in Example 1. The menstrual sanitary napkin was set as the sample of Comparative Example 1.

[Evaluation]

For the samples of Examples 1 to 2 (menstrual sanitary napkins) and the sample of Comparative Example 1 (menstrual sanitary napkins), the diffusion distance of the pseudo blood in the longitudinal direction was measured by the following method. The results are shown in Table 1 below.

<Method for measuring the diffusion distance of false blood in the vertical direction>

Use a female lower body model that can inject liquid from the excretion point to make the model After wearing the sample of the evaluation subject in an upright state, put the model in a state of lying on its back. Then, using a liquid discharge pump with a speed adjustment function, 3.0g of fake blood (horse blood) was injected every 1 minute from the discharge point for a total of 6g and 9g. After 1 minute has passed since the injection of 6g, the sample was removed from the model, and the longitudinal diffusion distance of each of the front sheet and absorber produced by the injection of pseudo blood (horse blood) was measured three times. The average value is taken as the spreading distance of the false blood (horse blood) in the longitudinal direction. It is believed that in any one of the front sheet and the absorbent body, the shorter the diffusion distance of the body fluid, the less likely it is to create a gap between the menstrual sanitary napkin and the wearer’s skin, and the less likely the body fluid to flow along the skin, and the evaluation is better high.

In addition, defibrinated horse blood (manufactured by Nippon Biotest Co., Ltd.) was used as fake blood.

As shown in Table 1, it can be seen that the menstrual sanitary napkins of Examples 1 and 2 are compared with the menstrual sanitary napkins of Comparative Example 1. The longitudinal diffusion distance of blood (horse blood) is relatively small. Accordingly, compared with the menstrual sanitary napkins of Comparative Example 1, the menstrual sanitary napkins of Examples 1 to 2 can be expected to be less likely to produce gaps between the skin and the skin during wearing, improve the conformability, and prevent body fluids from flowing along the skin. Increased leakage.

[Industrial availability]

According to the absorbent article of the present invention, the conformability is improved, the body fluid is not easy to flow along the skin, and the leakage resistance is improved.

1‧‧‧Menstrual sanitary napkins

2‧‧‧Front sheet

3‧‧‧Back sheet

4‧‧‧Absorber

5‧‧‧Leak-proof flanging forming sheet

9‧‧‧Slot

10‧‧‧Absorbent body

10H‧‧‧ Rear Wing

10H1‧‧‧Adhesive part of rear wing

10S‧‧‧Wing

10W‧‧‧Wing

10W1‧‧‧Wing part adhesive part

41‧‧‧Body absorbent sheet

42‧‧‧Central absorbent sheet

43‧‧‧Middle and high school

43B‧‧‧Back end

91‧‧‧The first horizontal rolling groove

92‧‧‧Longitudinal rolling groove

93‧‧‧The second transverse rolling groove

94‧‧‧The 3rd press groove

b3‧‧‧Width

CL‧‧‧Vertical centerline (imaginary vertical centerline)

d1‧‧‧interval

d2‧‧‧interval

d3‧‧‧interval

d4‧‧‧interval

d5‧‧‧interval

F‧‧‧Front

IL‧‧‧ imaginary line

M‧‧‧Middle part

M1‧‧‧Central slit

MS‧‧‧Central slit area

R‧‧‧Rear

R1ar, R1al‧‧‧Proximity slit

R1r, R1l‧‧‧rear slit

RS‧‧‧Back slit area

RSr, RSl‧‧‧rear slit area

X‧‧‧Vertical

Y‧‧‧Horizontal

Claims (24)

An absorbent article, which has a longitudinal direction corresponding to the front and back directions of a wearer and a transverse direction orthogonal to the longitudinal direction, and has an absorbent body, and has a front part, a middle part, and a rear part along the longitudinal direction. The absorbent system is described above The skin facing side of the middle part has a middle-high part thicker than the other parts, and the absorbent system is located on the rear side than the middle-high part, and has a rear slit area arranged with a rear slit extending in the longitudinal direction, The rear slit area is a pair of rear slits that are arranged on both sides of the imaginary longitudinal center line that bisects the absorber in the lateral direction and extends in the longitudinal direction, forming a pair of the rear slit area The horizontal interval of the adjacent slit arranged at the position closest to the above-mentioned mid-high part and located at the innermost side in the horizontal direction in the slit is the same as or greater than the horizontal width of the longitudinal rear end of the mid-high part. Such as the absorbent article of claim 1, wherein the horizontal interval of the above-mentioned proximity slit is the same as or more than the maximum horizontal length of the rearmost divided area on the rearmost side when the above-mentioned mid-high part is divided into 5 parts in the vertical direction. long. The absorbent article according to claim 1, wherein the absorbent system has a central slit area in the middle and high portion in which central slits extending in the longitudinal direction are dispersedly arranged in the longitudinal direction and the lateral direction. Such as the absorbent article of claim 3, in which the above-mentioned absorbent article is viewed from the transverse direction, and the composition is as above The rear end of the central rearmost slit located on the most rear side among the central slits in the central slit area and the front end of the proximity slit of each of the rear slit areas do not overlap. The absorbent article of claim 3, wherein the lateral distance between the laterally adjacent rear slits located at the innermost side in the lateral direction of each of the pair of rear slit regions is longer than the laterally adjacent central slits The horizontal distance between. The absorbent article of claim 1, wherein the rear slit located at the innermost side in the transverse direction of each of the pair of rear slit regions is located at a time when the transverse width of the longitudinal rear end of the middle-high part is divided into 5 equal parts. One area in the center is more laterally outside. The absorbent article of claim 1, wherein the absorbent article includes a front sheet and a back sheet sandwiching the absorbent body, and the front sheet and the absorbent body are integrated on the back face on the skin facing surface The sheet side has a groove at the bottom, and the absorbent article is viewed from above, and the rear slit constituting each of the rear slit regions has a portion overlapping the groove. The absorbent article of claim 1, wherein the absorbent article has an absorbent body, the absorbent body is provided with the absorbent body, and a front sheet and a back sheet sandwiching the absorbent body, compared with the absorbent body The middle part is further to the rear, and has a pair of rear wings extending from both sides of the absorbent body along the longitudinal direction to the outer side of the transverse direction. The upwardly extending anti-offset member, looking down on the absorbent article, constitutes the rear slit in each of the rear slit regions and It is not arranged more rearward than the longitudinal rear end of the anti-offset member. Such as the absorbent article of claim 1, wherein the shape of the aforementioned rear slit is a straight line or a curved line, and the straight line or curved line is a continuous line or a broken line. The absorbent article according to claim 1, wherein the angle formed by the rear slit and the imaginary longitudinal center line extending parallel to the longitudinal direction is less than 45 degrees. The absorbent article according to claim 1, wherein the rear slit extends in the longitudinal direction. The absorbent article according to claim 1, wherein in each of the aforementioned rear slit regions, there are two or more rows of slits extending in the longitudinal direction in the transverse direction. The absorbent article according to claim 12, wherein in each of the rear slit regions, the number of rear slits included in each of the slit rows is one or more. The absorbent article of claim 1, wherein the width of the rear slit when viewed from above is 0.1 mm or more and 1 mm or less. The absorbent article of claim 1, wherein the longitudinal length of the rear slit when viewed from above is 10 mm or more and 35 mm or less. Such as the absorbent article of claim 1, wherein the above-mentioned pair of rear slit areas respectively have In the case of a plurality of the above-mentioned rear slits, the lateral distance between the closest rear slits in the lateral direction is 3 mm or more and 18 mm or less. The absorbent article according to claim 1, wherein the absorbent system has a central slit area in the middle and high portion of the middle and high portion, in which central slits extending in the longitudinal direction are dispersedly arranged in the longitudinal direction and the lateral direction, and constitute the central slit area of the central slit area. Among the slits, the rear end of the rearmost slit located on the lateral center side of the central slit region and located furthest rearward in the longitudinal direction does not coincide with the front end of the proximal slit when viewed from the lateral direction. The absorbent article according to claim 17, wherein the longitudinal interval between the rear end of the central rearmost slit and the front end of the proximal slit is 0 mm or more and 20 mm or less. The absorbent article according to claim 1, wherein the above-mentioned absorbent system utilizes a multilayer structure formed by an absorbent sheet. The absorbent article of claim 19, wherein the above-mentioned multilayer structure is formed by stacking a plurality of the absorbent sheets, or formed by stacking one absorbent sheet. The absorbent article of claim 1, wherein the absorbent body includes a central absorbent sheet formed of an absorbent sheet in the middle portion, and a main absorbent sheet covering the central absorbent sheet, the central absorbent The sheet is arranged in the above-mentioned middle and high part. The absorbent article according to claim 1, wherein the thickness of the middle-high part of the absorbent body is 0.7 mm or more and 5 mm or less. The absorbent article of claim 1, wherein the thickness of the surrounding part of the middle-high part of the absorbent body other than the middle-high part is 0.3 mm or more and 3 mm or less. The absorbent article of claim 1, wherein the above-mentioned absorbent article is a menstrual sanitary napkin.

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