Absorbent article

Abstract

To provide an absorbent article excellent in fitness to a wearer, and hardly leaking from the back side.SOLUTION: An absorbent article 1 includes an absorbent body 5 constituted by including an absorber 4 containing a core wrap sheet 49 and an absorbent core 40. The absorbent core 40 includes an upper layer absorbent core 41 positioned on the skin facing surface side, and a lower layer absorbent core 42 positioned on the non-skin facing surface side. The absorbent article 1 further includes a pair of fastening parts. The fastening part includes a fastening tape 7. A longitudinal direction end part of the absorber 4 is positioned on a tape existence region A9.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an absorbent article. [Background technology]

[0002] Conventionally, there has been known an open-type disposable diaper in which a side panel that stretches in the width direction of the absorbent main body and has fastening tape is attached to a portion of the absorbent main body including an absorber that is placed on the back side of the wearer when worn.

[0003] In the diaper described in Patent Document 1, a fastening tape attached to the back side of the diaper has a fastening portion fixed to the back side and a protruding portion protruding outward in the width direction of the diaper beyond the fastening portion. The protruding portion comprises a tip portion and a main portion located closer to the fastening portion than the tip portion. A reinforcing nonwoven fabric layer is provided on the fastening portion and the tip portion. An elongated elastic member is fixed in a stretched state so as to straddle the fastening portion and the main portion. In addition, an elongated elastic member is fixed in a stretched state so as to straddle the main portion and the tip portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-22550 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the diaper described in Patent Document 1 does not fit closely to the waist area on the back of the wearer, and gaps tend to form between the diaper and the waist area, which can lead to leakage.

[0006] Therefore, the present invention relates to an absorbent article that fits closely to the wearer and is less likely to cause leakage from the back side. [Means for solving the problem]

[0007] The present invention relates to an absorbent article. The absorbent article preferably has a vertical direction corresponding to the front-to-back direction of the wearer and a horizontal direction perpendicular to the vertical direction, and has a crotch portion arranged in the crotch area of ​​the wearer, a ventral portion arranged closer to the wearer's abdomen than the crotch portion, and a dorsal portion arranged closer to the wearer's back than the crotch portion in the vertical direction. The absorbent article preferably includes an absorbent main body including an absorbent body. The absorbent body preferably includes a core wrap sheet and an absorbent core. The absorbent core preferably comprises an upper absorbent core located on the skin-facing side and a lower absorbent core located on the non-skin-facing side. The absorbent article preferably includes a pair of fastening portions extending laterally outward from both side edges along the longitudinal direction of the absorbent main body in the back portion. Each fastening portion preferably includes fastening tapes extending laterally outward from both side edges of the fastening portion. In a plan view, when the absorbent body is viewed from the outside in the vertical direction to the inside in the vertical direction along a vertical center line that divides the absorbent body in half horizontally and extends vertically, it is preferable that the vertical end of the absorbent body is located in a tape presence area, which is an area that overlaps vertically with the fastening tape on the absorbent body. [Effects of the Invention]

[0008] According to the present invention, an absorbent article is provided which fits closely to the wearer and is less likely to cause leakage from the back side. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a plan view schematically showing the skin-facing surface side of a disposable diaper as one embodiment of the absorbent article of the present invention in an unfolded and stretched state. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line II in FIG. [Figure 3]FIG. 3 is a schematic cross-sectional view taken along line II-II in FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along line III-III in FIG. [Figure 5] FIG. 5 is a plan view schematically showing the skin-facing side and the back side of a disposable diaper as another embodiment of the absorbent article of the present invention in an unfolded and stretched state. [Figure 6] FIG. 6 is a schematic cross-sectional view taken along line IV-IV in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, the absorbent article of the present invention will be described based on a disposable diaper as a preferred embodiment thereof with reference to the drawings. The disposable diaper (hereinafter simply referred to as the diaper) 1 shown in Figures 1 to 4 is one embodiment of a flat-type diaper. As shown in Figure 1, the diaper 1 has a longitudinal direction X extending from the wearer's abdomen through the crotch region to the back, and a lateral direction Y perpendicular to the longitudinal direction X.

[0011] The diaper 1 also has, in the longitudinal direction X, a crotch portion M located in the crotch region of the wearer, a ventral portion F located closer to the wearer's ventral side than the crotch portion M, and a dorsal portion R located closer to the wearer's dorsal side than the crotch portion M. The crotch portion M includes an excretory portion-facing portion (not shown) that faces the wearer's excretory portions such as the urethra or anus when worn. The ventral portion F, the crotch portion M, and the dorsal portion R correspond to three equal regions when the diaper 1 is divided into three equal parts in the longitudinal direction X.

[0012] The diaper 1 comprises a liquid-permeable topsheet 2, a liquid-impermeable or water-repellent backsheet 3, and a liquid-retentive absorbent body 4 interposed between the two sheets 2, 3. The topsheet 2, backsheet 3, and absorbent body 4 are joined together by adhesive or the like to form an absorbent main body 5. The absorbent main body 5 has a rectangular shape that is elongated in the longitudinal direction X in a plan view as shown in Fig. 1, and is disposed continuously from the ventral side portion F to the dorsal side portion R. The diaper 1 is formed symmetrically with respect to a longitudinal centerline CLx that bisects the absorbent main body 5 in the transverse direction Y and extends in the longitudinal direction X.

[0013] The diaper 1 is provided with a pair of side fastening parts 8, 8 fixed to both side edge parts 5S, 5S of the absorbent main body 5 in the longitudinal direction X in the back-side part R. The pair of side fastening parts 8, 8 are fixed to the absorbent main body 5 so as to extend outward in the lateral direction Y from both side edge parts 5S, 5S of the absorbent main body 5 in the back-side part R.

[0014] The topsheet 2 and the backsheet 3 each have dimensions larger than the absorbent body 4 and extend outward from the periphery of the absorbent body 4. The extending portions of the topsheet 2 and the backsheet 3 are joined to each other by known joining means such as adhesives, heat sealing, ultrasonic sealing, or the like, with or without the use of other intervening members. Various materials conventionally used in this type of absorbent article can be used without any particular restrictions for the topsheet 2 and the backsheet 3. For example, various nonwoven fabrics and perforated films can be used for the topsheet 2, and a resin film or a laminate of a resin film and a nonwoven fabric can be used for the backsheet 3. The back sheet 3 may be, for example, a liquid-impermeable film sheet alone, or may be an outer sheet laminated on the non-skin-facing side, i.e., the outer surface side, of the film sheet, and the outer sheet may be, for example, a nonwoven fabric.

[0015] The absorbent body 4 is configured to include a liquid-retaining absorbent core 40 and a core wrap sheet 49 that covers the absorbent core 40 . The absorbent core 40 of this embodiment has a shape that is elongated in the longitudinal direction X in the plan view shown in Fig. 1. The absorbent core 40 shown in Fig. 2 has a layered structure including an upper absorbent core 41 located on the skin-facing side and a lower absorbent core 42 located on the non-skin-facing side, and these absorbent cores 41, 42 are adjacent to each other and have their outer surfaces covered by a single core wrap sheet 49. Alternatively, the absorbent body 4 may have a configuration in which each absorbent core 41, 42 is covered by a single core wrap sheet 49, or may have a configuration in which the absorbent core 40 is covered using a plurality of core wrap sheets. In the following description, unless otherwise specified, the absorbent body 4 will be described as including the absorbent core 40 having the two-layer absorbent cores 41, 42, and the core wrap sheet 49.

[0016] The absorbent core 40 of this embodiment has a two-layer laminate structure including an upper absorbent core 41 and a lower absorbent core 42, but may instead have a three-layer or more laminate structure. In this case, another absorbent core may be provided on the skin-facing side of the upper absorbent core 41, or another absorbent core may be provided on the non-skin-facing side of the lower absorbent core 42. Alternatively, another absorbent core may be provided between the upper absorbent core 41 and the lower absorbent core 42.

[0017] Each of the absorbent cores 41, 42 in this embodiment has a rectangular shape in a plan view, and is disposed continuously from the ventral portion F to the dorsal portion R. The area in which the lower absorbent core 42 is disposed is larger than the area in which the upper absorbent core 41 is disposed. That is, in a plan view, the area of ​​the lower absorbent core 42 is larger than the area of ​​the upper absorbent core 41. Furthermore, each of the absorbent cores 41, 42 in this embodiment is disposed such that both side edges in the transverse direction Y and the side edges in the longitudinal direction X in the ventral portion F are aligned. Meanwhile, each of the absorbent cores 41, 42 is disposed such that the side edges in the longitudinal direction X in the dorsal portion R are different from each other.

[0018] In this embodiment, the longitudinal X-side edge of the upper absorbent core 41 in the back-side portion R is positioned inward in the longitudinal X direction relative to the longitudinal X-side edge of the lower absorbent core 42 in the back-side portion R. In other words, the lower absorbent core 42 in the back-side portion R extends outward in the longitudinal X direction relative to the longitudinal X-side edge of the upper absorbent core 41 in the back-side portion R. In addition, in this embodiment, the thickness of the lower absorbent core 42 is configured to be thinner than the thickness of the upper absorbent core 41.

[0019] In this specification, the "skin-facing side" refers to the side of an absorbent article or a component thereof that faces the skin of the wearer when the absorbent article is worn, i.e., the side that is relatively closer to the wearer's skin, and the "non-skin-facing side" refers to the side of an absorbent article or a component thereof that faces the opposite side to the skin when the absorbent article is worn, i.e., the side that is relatively farther from the wearer's skin. Furthermore, in this specification, "when worn" means the normal, proper wearing position, i.e., the state in which the correct wearing position of the absorbent article is maintained, and does not include a state in which the absorbent article is shifted from that wearing position. In addition, in this specification, the term "unfolded and stretched state" refers to a state in which the diaper 1 is unfolded and the elastic bodies of each part of the diaper 1 in the unfolded state are stretched to the designed dimensions (the same dimensions as when the diaper 1 is unfolded flat with all influence of the elastic bodies eliminated).

[0020] The absorbent core 40 may be made of any material that is commonly used as a material for forming this type of absorbent core, without any particular restrictions. The absorbent core 40 may be made of, for example, a pile of absorbent fibers such as pulp, a mixed pile of absorbent fibers and a water-absorbent polymer, a pile of absorbent polymers, or an absorbent core in which a layer of absorbent polymer is formed between the same or two different fiber sheets. These can be used in combination with one another. The core wrap sheet 49 and the constituent sheets of the absorbent sheet described above can each independently be made of a liquid-permeable fibrous sheet material such as paper or nonwoven fabric. The upper absorbent core 41 and the lower absorbent core 42 may contain the same or different materials. For example, both the upper absorbent core 41 and the lower absorbent core 42 may be composed of a mixed stack of absorbent fibers and a water-absorbent polymer, or both the upper absorbent core 41 and the lower absorbent core 42 may be composed of an absorbent sheet in which a layer of absorbent polymer is formed between the same or two different fibrous sheets. Alternatively, the upper absorbent core 41 may be composed of a mixed stack and the lower absorbent core 42 may be composed of an absorbent sheet, or the upper absorbent core 41 may be composed of an absorbent sheet and the lower absorbent core 42 may be composed of a mixed stack. Furthermore, as described above, when the thickness of the lower absorbent core 42 is configured to be thinner than the thickness of the upper absorbent core 41, for example, the stacking state of the fiber stack can be changed to configure each absorbent core 41, 42 to have different basis weights, or the upper absorbent core 41 can be configured as a fiber stack and the lower absorbent core 42 as an absorbent sheet.

[0021] Of these, the upper absorbent core 41 is preferably made of a mixed laminate consisting of absorbent fibers and absorbent polymers. The use of the mixed laminate improves the liquid absorption and retention of excreted liquids such as urine, thereby preventing leakage of the liquid to the outside of the diaper.

[0022] The lower absorbent core 42 is preferably made of an absorbent sheet in which a layer of water-absorbent polymer is formed between the same or two different fibrous sheets. By using an absorbent sheet, the lower absorbent core 42 can be made thin while still having high liquid absorption, and the entire diaper, including the back portion R, can be made thin. In addition, this improves the fit when worn and prevents liquid leakage to the outside of the diaper. In this embodiment, the upper absorbent core 41 is made of a mixed stack, and the lower absorbent core 42 is made of an absorbent sheet. As such an absorbent sheet, for example, the one described in International Publication No. 2021 / 132338 can be used.

[0023] The diaper 1 includes a pair of leakage-barrier cuffs 55, 55 arranged along both sides of the absorbent main body 5 in the longitudinal direction X. These cuffs are separate members from the absorbent main body 5. The leakage preventing cuff 55 is composed of a water-repellent and breathable cuff-forming sheet 56 and one or more cuff-forming elastic members 57. One end of the cuff-forming sheet 56 in the leakage preventing cuff 55 in the transverse direction Y is fixed to other members (the top sheet 2 and the back sheet 3 in the illustrated embodiment) to form a fixed end, and the other end in the transverse direction Y is a free end that is not fixed to other members. The cuff-forming elastic member 57 is fixed to the free end of the cuff-forming sheet 56 in a stretched state in the longitudinal direction X. This allows the leakage preventing cuff 55 to stretch in the longitudinal direction X. Furthermore, when the diaper 1 is worn, the contractile force of the elastic member 57 causes the free end of the leak-proof cuff 55, at least in the crotch region M, to stand up toward the wearer with the fixed end to another member as the standing base, thereby preventing excrement such as urine from flowing outward in the lateral direction Y.

[0024] As shown in Fig. 1, each of the pair of side fastening parts 8, 8 has a fastening tape 7 extending laterally outward on both side edges of the side fastening part 8. In detail, each of the pair of side fastening parts 8, 8 has a stretchable side panel 6 fixed to the absorbent main body 5 so as to extend outward in the lateral direction Y from the side edge 5S of the absorbent main body 5, and in addition includes a fastening tape 7 fixed to the side panel 6 so as to extend outward in the lateral direction Y from the side panel 6. The side panel 6 and fastening tape 7 constituting the side fastening part 8 are separate members from the absorbent main body 5.

[0025] As shown in FIG. 1 , the side panel 6 includes panel materials 61 that are rectangular in plan view on both lateral sides of the back portion R. In addition, the side panel 6 preferably includes a plurality of elastic members 62 that are fixed in a stretched state and extend in the lateral direction Y. The elastic members 62 are arranged at a predetermined interval in the longitudinal direction X in the center of the side panel 6 in the lateral direction Y. For example, the side panel 6 may have the above-described elastic members 62 fixed between two panel materials 61. By providing the elastic members 62 on the side panel 6, the formation of gaps between the wearer's skin near the side panel 6 is reduced, thereby preventing liquid leakage from areas near the side panel 6.

[0026] The position of the side panel 6 where the elastic members 62 are arranged (the center in the lateral direction Y) is a stretchable portion that is stretchable in the lateral direction Y, which is the extension direction of the elastic members 62, and each side panel 6 is stretchable in the lateral direction Y. Of the both side edge portions of the side panel 6 along the longitudinal direction X, the lateral inner edge portions relatively close to the longitudinal centerline CLx are fixed between the constituent members of the diaper 1 (for example, between the topsheet 2 and the backsheet) by known joining means such as an adhesive.

[0027] As shown in Fig. 1, the fastening tape 7 includes a tape substrate 71 and a fastening portion 72. The tape substrate 71 has a rectangular shape in a plan view as shown in Fig. 1, and one end side of the tape substrate 71 in the longitudinal direction (lateral direction Y) is fixed to the outer lateral end side of the side panel 6 by a known joining means such as an adhesive. A fastening portion 72 is fixed to the skin-facing surface of the tape substrate 71. The fastening portion 72 is made of, for example, a male or female member of a mechanical hook-and-loop fastener, and can be removably fastened to a fastening region (not shown) formed on the non-skin-facing surface of the abdominal portion F of the diaper 1. Alternatively, an adhesive can be used as the fastening portion 72.

[0028] The panel material 61 constituting the side panel 6 may be, for example, nonwoven fabrics manufactured by various methods such as air-through nonwoven fabrics, heat-rolled nonwoven fabrics, spunlace nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, woven fabrics, knitted fabrics, paper, resin films, etc., or sheet materials formed by laminating two or more of these together. The tape substrate 71 constituting the fastening tape 7 may be, for example, a nonwoven fabric or a laminate of a nonwoven fabric and a resin film.

[0029] A fastening region (not shown) to which a fastening tape is fastened is formed on the non-skin-facing surface of the diaper 1 in the abdominal portion F. The fastening region can be formed by arranging a mechanical hook-and-loop fastener or the like on the non-skin-facing surface of the backsheet 3, which forms the non-skin-facing surface of the absorbent main body 5.

[0030] As shown in Fig. 1, abdominal flaps 59, 59 are formed on both side edges 5S, 5S of the absorbent main body 5 in the abdominal portion F along the longitudinal direction X. Each abdominal flap 59 is made of a non-elastic sheet material. As with the side panels 6, the inner edge of the sheet material constituting the abdominal flaps 59 is fixed between the constituent members of the diaper 1 by a known joining means such as an adhesive. The formation of such abdominal flaps 59 further improves the fit of the diaper 1.

[0031] One of the features of the diaper of the present invention is that, in a plan view in the unfolded and stretched state as shown in Fig. 1, the positions of the side panels 6 in the side fastening portions 8 and the position of the absorbent core have a predetermined relationship. For convenience of explanation, the following description will mainly focus on the back portion R. Specifically, when the absorbent body 5 in the back side portion R of the diaper 1 is viewed along the longitudinal direction X, it is preferable that the end portion of the absorbent body 4 in the longitudinal direction X is located in the region where the side panel 6 is located. stomach. In this embodiment, the end portion of the absorbent body 4 in the longitudinal direction X is present in a part of the panel presence region, which is the region on the absorbent main body that overlaps with the side panel 6 in the longitudinal direction. As a result, a core lamination region A3 (see FIG. 2), which will be described later, is present in the panel presence region. The core lamination region A3 is present so as to extend outward in the longitudinal direction X from the inner end of the panel presence region in the longitudinal direction X.

[0032] The "panel presence region" is a region on the absorbent main body that is located between an imaginary line R1 connecting the outer ends of each side panel 6, 6 in the longitudinal direction X and an imaginary line R2 connecting the inner ends of each side panel 6, 6 in the longitudinal direction X in the back portion R in the plan view shown in FIG. 1, and is indicated by the symbol A7. The presence of the end of the absorbent body 4 in the longitudinal direction X in the panel presence region A7 improves the liquid absorption and retention in the back portion R when the diaper is worn, while also making it less likely for gaps to form between the wearer's back and the diaper 1, improving the fit and preventing liquid leakage, particularly from the back side. When the outer end or inner end of the side panel 6 in the longitudinal direction X is not parallel to the horizontal direction Y, the panel presence area A7 is defined as follows: If the intersection of the outer end of the member fixed at the inner end of the side panel 6 in the transverse direction Y with the outer end of the side panel 6 in the longitudinal direction X is defined as PS1, and the intersection of the outer end of the member in the transverse direction Y with the inner end of the side panel 6 in the longitudinal direction X is defined as PS2, the area on the absorbent main body located between the intersection PS1 and the intersection PS2 is the panel presence area A7.

[0033] Let L1 be the length of the panel region A7 along the longitudinal direction X, and L2 be the length of the end region (core layer region A3) of the absorbent 4 in the panel region A7 along the longitudinal direction X. The ratio of L2 to L1 (L2 / L1) is preferably 30% or more, more preferably 50% or more, and preferably 90% or less, more preferably 85% or less. This arrangement improves both liquid absorption and retention and fit, and effectively prevents liquid leakage from the back. If the outer or inner end of the side panel 6 along the longitudinal direction X is not parallel to the transverse direction Y, the length L1 refers to the distance from the intersection point PS1 to the intersection point PS2. The length L2 is the length along the longitudinal direction X from the imaginary line R2 connecting the inner ends of the side panels 6, 6 in the longitudinal direction X to the position of the outer end of the upper absorbent core 41 in the longitudinal direction X in the back portion R of the absorbent body 4 in the plan view shown in Figure 1.

[0034] In plan view, the panel presence region A7 preferably has a plurality of regions made of different constituent materials when the absorbent body 5 in the back portion R of the diaper 1 is viewed from the outside in the longitudinal direction X toward the inside in the longitudinal direction X.

[0035] In detail, when viewed from the outside in the vertical direction X toward the inside in the vertical direction X, it is preferable that the absorbent body 4 is formed in the following order: a non-existence area A1 (see Figure 4), which is an area where the absorbent body 4 is not present; a core presence area A2 (see Figure 3), which is an area where the upper absorbent core 41 of the constituent materials of the absorbent body 4 is not present and the lower absorbent core 42 is present; and a core stacking area A3 (see Figure 2), where the upper absorbent core 41 and the lower absorbent core 42 are present. It is also preferable that the above-mentioned non-existent region A1, core-existing region A2 and core-laminated region A3 are all present on the longitudinal center line CLx of the absorbent main body 5.

[0036] The core-existing region A2 does not necessarily have to be free of the upper absorbent core 41, and may, for example, contain only the lower absorbent core 42, or may contain both the core wrap sheet 49 and the lower absorbent core 42. In this embodiment, the core-existing region A2 does not contain the upper absorbent core 41, but contains the core wrap sheet 49 and the lower absorbent core 42. The core lamination region A3 is sufficient as long as at least the upper absorbent core 41 and the lower absorbent core 42 are present. For example, only the absorbent cores 41 and 42 may be present. A core wrap sheet 49 may also be present. In this embodiment, the core lamination region A3 includes the core wrap sheet 49 and both absorbent cores 41, 42. That is, in this embodiment, the core lamination region A3 can be considered to be the same as the region where the absorbent body 4 is present.

[0037] As described above, the absorbent main body 5 has a plurality of regions made of different constituent materials, and therefore the number of constituent members in the panel presence region A7 of the absorbent main body 5 decreases from the inside to the outside in the longitudinal direction X, resulting in a stepwise decrease in rigidity in the regions where the side panels 6 are present. As a result, the diaper 1 can be effectively fitted along the back of the wearer, and liquid leakage from the back can be more effectively prevented.

[0038] As shown in FIG. 4 , the non-existence region A1, which is a region where the absorbent body 4 is not present, is a region where the absorbent core 40 and core wrap sheet 49, which are components of the absorbent body 4, are not present. When viewed along the thickness direction Z, this region is a region where components other than the absorbent body 4, such as the topsheet 2 and backsheet 3, are present. That is, in the plan view and in the back portion R shown in FIG. 1 , the non-existence region A1 is a region between an imaginary line R1 connecting the outer ends of the side panels 6, 6 in the longitudinal direction X to the outermost position in the longitudinal direction X of the portion of the back portion R where the components of the absorbent body 4 are present. In this embodiment, the non-existence region A1 is located in the outer region in the longitudinal direction X of the region where the side panels 6 are present. In addition, a structure identical to the non-existence region A1 is continuously formed to the outer end of the diaper 1 in the longitudinal direction X, which is located outward of the non-existence region A1.

[0039] When the length of the non-existence area A1 in the panel presence area A7 along the longitudinal direction X is defined as L3, the ratio of L3 to L1 (L3 / L1) is preferably 0% or more, more preferably 2% or more, and is preferably 25% or less, more preferably 10% or less. This arrangement improves both liquid absorption and retention and fit, and effectively prevents liquid leakage from the back side. The length L3 is the length along the longitudinal direction X from an imaginary line R1 connecting the outer ends of the side panels 6, 6 in the longitudinal direction X to the outermost position in the longitudinal direction X among the portions where the components of the absorbent body 4 are present, in the plan view and in the back portion R shown in FIG.

[0040] 3, the core-existing region A2 is a region of the constituent materials of the absorbent body 4 where the upper absorbent core 41 is absent and the lower absorbent core 42 is present. In this embodiment, the core-existing region A2 also includes the core wrap sheet 49. The core-existing region A2 is located more inward in the longitudinal direction X than the non-existing region A1 and more outward in the longitudinal direction X than the core stacking region A3, and the non-existing region A1 and the core-existing region A2 are adjacent to the core-existing region A2 and the core stacking region A3, respectively.

[0041] The lower absorbent core 42 present in the core presence region A2 of this embodiment is an absorbent sheet in which a layer of particles of water-absorbent polymer 45 is formed between two identical or different fibrous sheet materials 43, 44. The absorbent sheet constituting the lower absorbent core 42 of this embodiment has the water-absorbent polymer 45 distributed over its entire area in a plan view, and the water-absorbent polymer 45 is present up to the outer ends in the longitudinal direction X. In this case, when viewed along the thickness direction Z, the region where the core wrap sheet 49 and all of the components constituting the lower absorbent core 42, namely the two fibrous sheet materials 43, 44 and the water-absorbent polymer 45, are present is the core presence region A2.

[0042] When the length of the core region A2 in the panel region A7 along the longitudinal direction X is defined as L4, the ratio of L4 to L1 (L4 / L1) is preferably 5% or more, more preferably 10% or more, and is preferably 30% or less, more preferably 20% or less. This arrangement improves both liquid absorption and retention and fit, and effectively prevents liquid leakage from the back side. The length L4 is the length inward in the longitudinal direction X of the non-existence region A1 in the plan view and in the dorsal portion R shown in FIG. It is the length along the longitudinal direction X from the end to the outer end in the longitudinal direction X of the core laminated region A3 (specifically, the outer end in the longitudinal direction X of the upper absorbent core 41).

[0043] 2, the core lamination region A3 is a region where at least the upper absorbent core 41 and the lower absorbent core 42 are present, and in this embodiment, it is a region where all of the constituent materials of the absorbent body 4 are present. In other words, when viewed along the thickness direction Z, the core lamination region A3 is a region that includes the core wrap sheet 49 and the absorbent core 40, which includes the upper absorbent core 41 and the lower absorbent core 42. In this embodiment, the core lamination region A3 is located inward in the longitudinal direction X from the core presence region A2, and is adjacent to both the core presence region A2 and the core lamination region A3. In addition, the same configuration of the absorbent body 4 as that of the core lamination region A3 is continuously formed across the crotch portion M and the abdominal portion F.

[0044] When the side panels 6 are provided with the elastic members 62, they are preferably arranged in a predetermined relationship with respect to the position of the absorber 4 on the back side R of the diaper 1. Specifically, when the absorbent main body 5 in the back region R of the diaper 1 is viewed along the longitudinal direction X, it is preferable that the core stacking region A3 is present in the elastic member presence region, which is a region that longitudinally overlaps with the region in which the elastic members 62 are present in the side panels 6 on the absorbent main body 5, and it is also preferable that the core presence region A2 is present in addition to the core stacking region A3. In this embodiment, both the core presence region A2 and the core stacking region A3 are present in a portion of the longitudinal direction X within the region in which the elastic members 62 are present. Furthermore, the elastic member presence region may or may not include a non-presence region A1, as in this embodiment.

[0045] 1 and focusing on the side panels 6, 6 in the back portion R, the "elastic member presence region" is a region on the absorbent main body located between an imaginary line R5 connecting the elastic members 62 located furthest outward in the longitudinal direction X among the plurality of elastic members 62 and an imaginary line R6 connecting the elastic members 62 located furthest inward in the longitudinal direction X among the plurality of elastic members 62, and is indicated by the symbol A8. In this embodiment, the elastic member presence region A8 is located in a partial region in the longitudinal direction X within the panel presence region A7. The presence of the core presence region A2 and the core laminated region A3 in the elastic member presence region A8 allows the back portion R to have a low rigidity, while the stretchability of the elastic members makes it difficult for a gap to form between the wearer's back and the diaper 1. As a result, the fit is improved, and leakage, particularly from the back side, can be prevented. If the elastic member 62 located most outward in the longitudinal direction X or the elastic member 62 located most inward in the longitudinal direction X among the plurality of elastic members 62 arranged on the side panel 6 is not parallel to the transverse direction Y, the elastic member presence region A8 is defined as follows: That is, when the intersection between the inner fixed end portion in the transverse direction Y of the elastic member 62 located most outward in the longitudinal direction X and the outer end of the side panel 6 in the longitudinal direction is defined as PD1, and the intersection between the inner fixed end portion in the transverse direction Y of the elastic member 62 and the inner end of the side panel 6 in the longitudinal direction X is defined as PD2, the region on the absorbent main body located between the intersection point PD1 and the intersection point PD2 is the elastic member presence region A8.

[0046] When the length of the elastic member presence region A8 along the longitudinal direction X is defined as length L5, and the length of the core laminated region A3 present within the elastic member presence region A8 along the longitudinal direction X is defined as length L6, the percentage of the ratio of length L6 to length L5 (L6 / L5) is preferably 30% or more, more preferably 50% or more, and preferably 95% or less, more preferably 90% or less. This arrangement further enhances fit and effectively prevents liquid leakage from the back side. Note that, if the elastic member 62 located most outward in the longitudinal direction X or the elastic member 62 located most inward in the longitudinal direction X among the multiple elastic members 62 arranged on the side panel 6 is not parallel to the transverse direction Y, the length L5 is the distance from the intersection point PD1 to the intersection point PD2. It's about distance.

[0047] When the length of the core region A2 in the elastic member region A8 along the longitudinal direction X is defined as L7, the ratio of L7 to L5 (L7 / L5) is preferably 5% or more, more preferably 10% or more, and is preferably 35% or less, more preferably 25% or less. This arrangement further improves the fit and effectively prevents liquid leakage from the back side.

[0048] The length L5 is the length along the longitudinal direction X between the imaginary lines R5 and R6 in the back portion R in the plan view shown in FIG. The length L6 is the length along the longitudinal direction X from the imaginary line R6 to the position of the outer end of the upper absorbent core 41 in the longitudinal direction X in the back portion R of the absorbent body 4 in the plan view and in the back portion R shown in Figure 1. The length L7 is the length along the longitudinal direction X from the outer end of the upper absorbent core 41 in the back portion R of the absorbent body 4 in the longitudinal direction X to the outer end of the lower absorbent core 42 in the back portion R in the longitudinal direction X, in the plan view and in the back portion R shown in Figure 1.

[0049] It is preferable that the diaper 1 is arranged in the back portion R such that the fastening tape 7 and the absorber 4 have a predetermined relationship. Specifically, when the absorbent main body 5 in the back portion R of the diaper 1 is viewed along the longitudinal direction X, it is preferable that the end of the absorber 4 in the longitudinal direction X is present in a tape presence region, which is a region that longitudinally overlaps with the fastening tape 7 on the absorbent main body 5. It is also preferable that the core lamination region A3 is present in the tape presence region. In this embodiment, the end of the core lamination region A3 in the longitudinal direction X is present in a part of the tape presence region in the longitudinal direction X. Furthermore, no non-presence region A1 is present in the region where the fastening tape 7 is present.

[0050] The "tape presence region" is a region on the absorbent main body located between an imaginary line R8 connecting the outer ends of the fastening tapes 7, 7 in the longitudinal direction X and an imaginary line R9 connecting the inner ends of the fastening tapes 7, 7 in the longitudinal direction X in the plan view and in the back side portion R shown in Fig. 1, and is indicated by the symbol A9. In this embodiment, the tape presence region A9 exists in a partial region in the longitudinal direction X within the panel presence region A7, and also exists in a partial region in the longitudinal direction X within the elastic member presence region A8. The presence of the end of the core laminated region A3 in the longitudinal direction X in the tape presence region A9 allows the region of the tape presence region A9 along the transverse direction Y to abut against the wearer's back without sagging when the diaper is worn, further reducing the likelihood of a gap being formed between the wearer's back and the diaper 1. This results in an improved fit and more effective prevention of fluid leakage, particularly from the back side. When the outer end or inner end in the longitudinal direction X of the fastening tape 7 is not parallel to the transverse direction Y, the tape presence area A9 is defined as follows: That is, when the intersection of the outer end in the transverse direction Y of the member fixed at the inner end in the transverse direction Y of the fastening tape 7 and the outer end in the longitudinal direction X of the fastening tape 7 is defined as PT1, and the intersection of the outer end in the transverse direction Y of the member and the inner end in the longitudinal direction X of the fastening tape 7 is defined as PT2, the area on the absorbent main body located between the intersection point PT1 and the intersection point PT2 is the tape presence area A9.

[0051] When the length of the tape presence area A9 along the longitudinal direction X is defined as length L8, and the length of the core laminated area A3 present in the tape presence area A9 along the longitudinal direction X is defined as length L9, the percentage of the ratio of length L9 to length L8 (L9 / L8) is preferably 10% or more, more preferably 20% or more, and preferably 90% or less, more preferably 85% or less. With such a positional relationship, it is possible to simultaneously improve the liquid absorption and retention properties and the fit, and to effectively prevent liquid leakage from the back side. Note that the outer end or the outer end of the fastening tape 7 along the longitudinal direction X is When the inner end in the longitudinal direction X is not parallel to the transverse direction Y, the length L8 is the distance from the intersection point PT1 to the intersection point PT2.

[0052] The length L8 is the length along the vertical direction X between an imaginary line R8 connecting the outer ends of each fastening tape 7, 7 in the vertical direction X and an imaginary line R9 connecting the inner ends of each fastening tape 7, 7 in the vertical direction X, in the plan view and on the back side R shown in Figure 1. The length L9 is the length along the longitudinal direction X from the imaginary line R9 connecting the inner ends of the fastening tapes 7, 7 in the longitudinal direction X to the position of the outer end of the upper absorbent core 41 in the longitudinal direction X in the back portion R of the absorbent body 4 in the plan view and in the back portion R shown in Figure 1.

[0053] Furthermore, when the absorbent main body 5 in the back portion R of the diaper 1 is viewed along the longitudinal direction X, it is preferable that the core presence region A2, in addition to the core stacking region A3, is also located within the tape presence region A9. The core presence region A2 has fewer components than the core stacking region A3 and is configured to have lower rigidity, which allows the diaper 1 to conform more easily to the wearer's skin, improving fit and more effectively preventing liquid leakage, particularly from the back side.

[0054] When the length of the core-existing region A2 in the tape-existing region A9 along the longitudinal direction X is defined as La, the ratio of the length La to the length L8 (La / L8) is preferably 5% or more, more preferably 10% or more, and is preferably 80% or less, more preferably 70% or less. This arrangement improves both the liquid absorption and retention properties and the fit, and effectively prevents liquid leakage from the back side. The length La is the length along the longitudinal direction X from the imaginary line R8 connecting the outer ends of the fastening tapes 7, 7 in the longitudinal direction X to the position of the outer end of the upper absorbent core 41 in the longitudinal direction X in the back portion R of the absorbent body 4 in the plan view and in the back portion R shown in Figure 1.

[0055] Figures 5 and 6 show another embodiment of the absorbent article according to the present invention. In the following explanation, components that differ from the embodiment shown in Figures 1 to 4 described above will be mainly explained, and similar components will be given the same reference numerals and will not be explained again. For components that are not specifically explained, the explanations for the above-mentioned embodiment will be applied as appropriate, and any configurations can be adopted alone or in combination.

[0056] The flat-type disposable diaper (diaper 1) shown in Figs. 5 and 6, which is one embodiment of the absorbent article, has a structure of an absorbent body 4 that differs from the above-described embodiments. In detail, in the panel presence region A7 (the region overlapping the side panel 6 on the absorbent main body 5 in the vertical direction), when the absorbent main body 5 in the back side portion R of the diaper 1 is viewed from the outside in the vertical direction X toward the inside in the vertical direction X, it is preferable to have a sheet presence region A4 in which a sheet material including a core wrap sheet 49 exists between the non-presence region A1 and the core presence region A2. In other words, when the absorbent body 5 in the back side portion R is viewed from the outside in the vertical direction X toward the inside in the vertical direction X, it is preferable that the non-existence region A1, the sheet presence region A4, the core presence region A2 and the core laminated region A3 are formed in this order.

[0057] 5, the non-existence area A1 and the sheet existence area A4 are adjacent to each other, the sheet existence area A4 and the core existence area A2 are adjacent to each other, and the core existence area A2 and the core stacking area A3 are adjacent to each other. The sheet existence area A4 is located in a portion of the panel existence area A7 in the longitudinal direction X. With this configuration, the absorbent body 5 in the region where the side panels 6 are present has a structure in which the number of components gradually decreases from the inside to the outside in the longitudinal direction X, which makes it easier to form areas with gradually decreasing rigidity in the region where the side panels 6 are present. As a result, the diaper 1 can be effectively fitted along the back of the wearer, and liquid leakage from the back can be more effectively prevented.

[0058] The sheet presence region A4 is a region where only the sheet material exists among the constituent members of the absorbent body 4. In the sheet presence region A4, at least the core wrap sheet 49 exists, and in addition, a fibrous sheet material that is a constituent material of the absorbent core may also exist. In the embodiment shown in Figure 6, when focusing on the lower absorbent core 42 in the form of an absorbent sheet, the sheet presence area A4 is an area formed so that two identical or different fibrous sheet materials 43, 44 are present together and particles of the water-absorbent polymer 45 are substantially absent. Alternatively, only one of the two fibrous sheet materials 43, 44 may be present. In this embodiment, the water-absorbent polymer 45 constituting the upper absorbent core 41 and the lower absorbent core 42 is not present in the sheet presence area A4. The outer surfaces of both fibrous sheet materials 43, 44 are covered with a core wrap sheet 49. The above-mentioned "substantially no particles of the water-absorbing polymer 45" means (i) when both the fibrous sheet materials 43 and 44 are present and no particles of the water-absorbing polymer 45 are present, and (ii) when both the fibrous sheet materials 43 and 44 are present and the water-absorbing polymer 45 is present in a density of 30 g / m or less. 2The boundary between the sheet-existing region A4 and the core-existing region A2 includes both cases where the fibrous sheet materials 43 and 44 are present and the particle of the water-absorbing polymer 45 is unintentionally present at a basis weight of 30 g / m or less. 2 A region where particles of the water-absorbing polymer 45 exist and fibrous sheet materials 43 and 44 exist together at a basis weight of more than 30 g / m 2 The boundary between the area where the particles of the water-absorbing polymer 45 are present can be defined as the boundary with the area where the particles of the water-absorbing polymer 45 are present at the following basis weight.

[0059] As described above, when an absorbent sheet is used as the lower absorbent core 42, in order to have both fibrous sheet materials 43, 44 and the core wrap sheet 49 present in the sheet presence area A4, for example, a polymer-free area, which is an area where no absorbent polymer 45 is present between the both fibrous sheet materials 43, 44, can be formed in the end region in the longitudinal direction X of the absorbent sheet as the lower absorbent core 42. This polymer-free region needs to be formed at least in the longitudinal end region X of the absorbent sheet located on the back side R side of the diaper 1, but it is not prohibited to further form it in the longitudinal end region of the other side (ventral side F) or in the transverse end region Y. The formation of the polymer-free region prevents the water-absorbent polymer 45 from falling out to the outside of the absorbent sheet, and the liquid absorption and retention properties of the absorbent body 4 can be further improved.

[0060] When the length of the sheet region A4 in the panel region A7 along the longitudinal direction X is defined as Le, the ratio of the length Le to the length L1 (Le / L1) is preferably 5% or more, more preferably 10% or more, and is preferably 30% or less, more preferably 25% or less. This arrangement improves both the liquid absorption and retention properties and the fit, and effectively prevents liquid leakage from the back side. The length Le is the length along the longitudinal direction X from the outermost position in the longitudinal direction X of the portion where the constituent members of the absorbent body 4 exist to the position of the core existence region A2 in the plan view and in the back side portion R shown in Figure 5.

[0061] The thicknesses (lengths along the thickness direction Z) of the non-presence region A1, the sheet-presence region A4, the core-presence region A2, and the core-laminated region A3 are preferably configured so that the thicknesses increase in the order of non-presence region A1, sheet-presence region A4, core-presence region A2, and core-laminated region A3. This configuration allows the back portion R of the diaper 1 to easily conform to the wearer's back, improving the fit and effectively preventing back leakage.

[0062] The thickness H1 of the non-existent region A1 is preferably 1 mm or more, more preferably 2 mm or more, and is preferably 8 mm or less, more preferably 6 mm or less. The thickness H4 in the sheet presence area A4 is preferably 1.5 mm or more, more preferably It is 2.5 mm or more, preferably 8.5 mm or less, and more preferably 6.5 mm or less. The thickness H2 of the core-existing region A2 is preferably 2 mm or more, more preferably 3 mm or more, and is preferably 9 mm or less, more preferably 7 mm or less. The thickness H3 of the core lamination region A3 is preferably 5 mm or more, more preferably 6 mm or more, and is preferably 12 mm or less, more preferably 10 mm or less. All of these thicknesses are measured by magnifying and observing the cross section under no load using a microscope (Keyence Corporation's Digital Microscope VHX-1000). The ranges and measurement methods for each of the thicknesses H1, H2, and H3 can also be appropriately applied to the embodiment shown in FIG. 1 described above. Note that measurements may be performed under a low load of 0.05 kPa to suppress the influence of fuzzing on the thickness, and a laser displacement meter may be used instead of image observation.

[0063] The length L1 of the panel presence area A7 along the vertical direction X can be changed as appropriate depending on the desired shape of the diaper 1 and the shape of the side panel 6, but is preferably 50 mm or more, more preferably 75 mm or more, and preferably 150 mm or less, more preferably 120 mm or less. The length L2 along the longitudinal direction X of the core laminated region A3 present within the panel presence region A7 can be changed as appropriate depending on the desired shape of the diaper 1, but is preferably 30 mm or more, more preferably 35 mm or more, and preferably 120 mm or less, more preferably 100 mm or less. The length L3 along the longitudinal direction X of the non-existence area A1 present within the panel presence area A7 can be changed as appropriate depending on the desired shape of the diaper 1, but is preferably 1 mm or more, more preferably 2 mm or more, and preferably 15 mm or less, more preferably 10 mm or less. The length L4 along the longitudinal direction X of the core presence region A2 present within the panel presence region A7 can be changed as appropriate depending on the desired shape of the diaper 1, but is preferably 2 mm or more, more preferably 3 mm or more, and preferably 80 mm or less, more preferably 75 mm or less.

[0064] The length L5 of the elastic member presence area A8 along the longitudinal direction X can be changed as appropriate depending on the desired shape of the diaper 1, but is preferably 45 mm or more, more preferably 70 mm or more, and preferably 140 mm or less, more preferably 110 mm or less. The length L6 along the longitudinal direction X of the core laminated region A3 present within the elastic member presence region A8 can be changed as appropriate depending on the desired shape of the diaper 1, but is preferably 30 mm or more, more preferably 35 mm or more, and preferably 120 mm or less, more preferably 100 mm or less. The length L7 along the longitudinal direction X of the core presence region A2 present within the elastic member presence region A8 can be changed as appropriate depending on the desired shape of the diaper 1, but is preferably 2 mm or more, more preferably 3 mm or more, and preferably 80 mm or less, more preferably 75 mm or less.

[0065] The length L8 of the tape presence area A9 along the longitudinal direction X can be changed as appropriate depending on the desired shape of the diaper 1, but is preferably 20 mm or more, more preferably 25 mm or more, and preferably 50 mm or less, more preferably 40 mm or less. The length L9 along the longitudinal direction X of the core laminated region A3 within the tape presence region A9 can be changed as appropriate depending on the desired shape of the diaper 1, but is preferably 20 mm or more, more preferably 25 mm or more, and preferably 45 mm or less, more preferably 35 mm or less. The length La of the core existing region A2 in the tape existing region A9 along the longitudinal direction X can be appropriately changed depending on the desired shape of the diaper 1, but is preferably 1 mm or more, more preferably 1 mm or more. The thickness is preferably 2 mm or more, and more preferably 40 mm or less, and more preferably 35 mm or less. The length Le of the sheet presence area A4 along the longitudinal direction X can be changed as appropriate depending on the desired shape of the diaper 1, but is preferably 2 mm or more, more preferably 5 mm or more, and preferably 30 mm or less, more preferably 20 mm or less.

[0066] Although the present invention has been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate. For example, elastic members may be arranged on both lateral sides of the absorbent body 5 on the lateral outer side so as to extend in the longitudinal direction X through the crotch portion M, so that leg gathers are formed on both lateral sides of the diaper 1 in the longitudinal direction X. Furthermore, for example, the upper absorbent core 41 may have a lateral length smaller than that of the lower absorbent core 42, so that both side edges in the lateral direction Y or the side edges in the longitudinal direction X in the abdominal portion F are arranged in different positions. Furthermore, in order to improve the fit of the back region R, the upper absorbent core 41 may have a planar shape like a rice scoop, with a narrow back region and a wide ventral region. Also, in order to improve the fit of the crotch region M, the upper absorbent core 41 may have a planar shape like an hourglass, with a narrowed center. Furthermore, in order to improve the liquid absorption rate and fit, the upper absorbent core 41 may have through-holes or compressed regions. In the above embodiment, the side fastening parts 8 are configured to include the side panels 6 and the fastening tapes 7. However, instead, the side fastening parts 8 may be configured only with the fastening tapes 7. In this case, the fastening tapes 7 can be fixed to the absorbent main body 5 so as to extend outward in the horizontal direction Y from both side edges 5S, 5S along the vertical direction X of the absorbent main body 5 in the back-side portion R of the diaper 1.

[0067] In relation to the above-described embodiment of the present invention, the following absorbent article is further disclosed. <1> An absorbent article having a vertical direction corresponding to the front-to-back direction of a wearer and a horizontal direction perpendicular to the vertical direction, and having a crotch portion arranged in the crotch area of ​​the wearer, a ventral portion arranged closer to the wearer's ventral side than the crotch portion, and a dorsal portion arranged closer to the wearer's back than the crotch portion in the vertical direction, The absorbent article includes an absorbent body including an absorbent body, The absorbent body includes a core wrap sheet and an absorbent core, The absorbent core comprises an upper absorbent core located on the skin-facing side and a lower absorbent core located on the non-skin-facing side, The absorbent article includes a pair of fastening portions extending laterally outward from both side edges along the longitudinal direction of the absorbent main body in the back side portion, Each fastening portion includes fastening tapes extending laterally outward on both side edges of the fastening portion, An absorbent article in which, in a plan view, when the absorbent body is viewed from the outside in the vertical direction to the inside in the vertical direction along a vertical center line that divides the absorbent body in half horizontally and extends vertically, the vertical end of the absorbent core is located in a tape presence area, which is an area that vertically overlaps with the fastening tape on the absorbent body.

[0068] <2> The upper absorbent core is formed by mixing and stacking water-absorbent fibers and water-absorbent polymers. <1> The absorbent article according to claim 1. <3> The lower absorbent core is formed by forming a layer of water-absorbing polymer between two fibrous sheets. <1> or <2> The absorbent article according to claim 1. <4> The length L8 of the tape presence area along the vertical direction is 20 mm or more, preferably 25 mm or more, and 50 mm or less, preferably 40 mm or less. <1> Or <3> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <5> When the absorbent body is viewed in the longitudinal direction, at least a part of a core presence region where the upper absorbent core is not present and the lower absorbent core is present is located in the tape presence region. <1> Or <4> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <6> The length of the tape presence area along the vertical direction is defined as length L8, When the length of the core existing region in the tape existing region along the longitudinal direction is defined as length La, The ratio of the length La to the length L8 (La / L8) is 5% or more, preferably 10% or more, and 80% or less, preferably 70% or less. <5> The absorbent article according to claim 1. <7> The length La of the core-existing region in the tape-existing region along the longitudinal direction is 1 mm or more, preferably 2 mm or more, and 40 mm or less, preferably 35 mm or less. <5> or <6> The absorbent article according to claim 1. <8> Each fastening portion includes a side panel. <1> Or <7> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <9> In a plan view, when the absorbent main body is viewed from the outside in the vertical direction to the inside in the vertical direction along a vertical center line that divides the absorbent main body in half in the horizontal direction and extends vertically, a panel presence region that is a region on the absorbent main body that overlaps with the side panel in the vertical direction is an absorbent-free region; a core presence region where the upper absorbent core is absent and the lower absorbent core is present; and the upper absorbent core and the lower absorbent core are disposed in this order in a core lamination region. <8> The absorbent article according to claim 1.

[0069] <10> The length of the tape presence area along the vertical direction is defined as length L8, When the length along the longitudinal direction of the core lamination region present in the tape presence region is length L9, The ratio of the length L9 to the length L8 (L9 / L8) is 10% or more, preferably 20% or more, and 90% or less, preferably 85% or less. <9> The absorbent article according to claim 1. <11> The length L9 of the core laminated region in the tape existing region along the longitudinal direction is 20 mm or more, preferably 25 mm or more, and 45 mm or less, preferably 35 mm or less. <9> or <10> The absorbent article according to claim 1. <12> When the absorbent body is viewed from the outside in the longitudinal direction along the longitudinal center line to the inside in the longitudinal direction, a sheet presence region in which a sheet material including the core wrap sheet is present is further disposed between the non-existence region and the core presence region. <9> Or <11> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <13> The length of the panel presence area along the vertical direction is defined as L1, The length along the vertical direction of the sheet existing area existing in the panel existing area is defined as length Le. When I did, The ratio (Le / L1) of the length Le to the length L1 is 5% or more, preferably 10% or more, and 30% or less, preferably 25% or less. <12> The absorbent article according to claim 1.

[0070] <14> The thickness H4 in the sheet presence region is 1.5 mm or more, preferably 2.5 mm or more, and 8.5 mm or less, preferably 6.5 mm or less. <12> or <13> The absorbent article according to claim 1. <15> The length Le of the sheet presence region along the longitudinal direction is 2 mm or more, preferably 5 mm or more, and 30 mm or less, preferably 20 mm or less. <12> Or <14> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material.

[0071] <16> the lower absorbent core has a polymer-free region in its longitudinal end region where no water-absorbing polymer is present between the two fibrous sheets; The core wrap sheet and a fiber sheet material located in the polymer-free region are arranged in the sheet-present region. <12> Or <15> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <17> In the panel presence region, when the absorbent main body is viewed from the outside in the longitudinal direction to the inside in the longitudinal direction along the longitudinal center line, an absorbent-free region; a sheet presence region where a sheet material including the core wrap sheet is present; a core presence region where the upper absorbent core is absent and the lower absorbent core is present; and a core lamination region in which the upper absorbent core and the lower absorbent core are present, arranged in this order; the thickness of each region increases in the order of the non-existence region, the sheet presence region, the core presence region, and the core laminated region; <9> Or <16> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <18> Each of the side panels has a plurality of laterally extending and longitudinally spaced elastic members. <8> Or <17> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <19> The length along the vertical direction of the elastic member existing region, which is a region that overlaps in the vertical direction with the region where the elastic member is present in the side panel on the absorbent main body, is defined as length L5, When the length along the longitudinal direction of the core laminated region existing in the elastic member existing region is defined as length L6, The ratio of the length L6 to the length L5 (L6 / L5) is 30% or more, preferably 50% or more, and 95% or less, preferably 90% or less. <18> The absorbent article according to claim 1.

[0072] <20> The length of the elastic member presence region along the vertical direction is defined as length L5, When the length along the vertical direction of the core existing region existing in the elastic member existing region is length L7, The ratio of the length L7 to the length L5 (L7 / L5) is 5% or more, preferably 10% or more, and 35% or less, preferably 25% or less. <19> Absorbency as described in Goods. <21> The length L5 of the elastic member area along the vertical direction is 45 mm or more, preferably 70 mm or more, and 140 mm or less, preferably 110 mm or less. <19> or <20> The absorbent article according to claim 1. <22> The length L6 along the longitudinal direction of the core laminated region present in the elastic member existing region is 30 mm or more, preferably 35 mm or more, and 120 mm or less, preferably 100 mm or less. <19> Or <21> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <23> The length L7 of the core existing region in the elastic member existing region along the longitudinal direction is 2 mm or more, preferably 3 mm or more, and 80 mm or less, preferably 75 mm or less. <19> Or <22> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <24> each side panel having a plurality of laterally extending and longitudinally spaced elastic members; When the absorbent main body is viewed from the outside in the vertical direction toward the inside in the vertical direction along the vertical center line, the core stacking region and the core existing region are located in an elastic member existing region which is a region that overlaps in the vertical direction with a region in which the elastic member is present in the side panel on the absorbent main body. <9> Or <23> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material.

[0073] <25> The length of the panel presence area along the vertical direction is defined as L1, When the length along the longitudinal direction of the longitudinal end region of the absorber present in the panel presence region is length L2, The ratio of the length L2 to the length L1 (L2 / L1) is 30% or more, preferably 50% or more, and 90% or less, preferably 85% or less. <9> Or <24> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <26> The length of the panel presence area along the vertical direction is defined as L1, When the length of the non-existence area existing in the panel existence area along the vertical direction is length L3, The ratio of the length L3 to the length L1 (L3 / L1) is 0% or more, preferably 2% or more, and 25% or less, preferably 10% or less. <9> Or <25> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <27> The length of the panel presence area along the vertical direction is defined as L1, When the length of the core existing region in the panel existing region along the vertical direction is defined as length L4, The ratio of the length L4 to the length L1 (L4 / L1) is 5% or more, preferably 10% or more, and 30% or less, preferably 20% or less. <9> Or <26> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <28> the thickness H1 of the non-existence region is 1 mm or more, preferably 2 mm or more, and 8 mm or less, preferably 6 mm or less; <9> Or <27> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <29> The thickness H2 of the core region is 2 mm or more, preferably 3 mm or more, and 9 mm or less, preferably 7 mm or less. <9> Or <28> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material.

[0074] <30> The thickness H3 of the core laminated region is 5 mm or more, preferably 6 mm or more, and 12 mm or less, preferably 10 mm or less. <9> Or <29> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <31> The length L1 of the panel area along the vertical direction is 50 mm or more, preferably 75 mm or more, and 150 mm or less, preferably 120 mm or less. <9> Or <30> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <32> The length L2 along the longitudinal direction of the core laminated region present in the panel existing region is 30 mm or more, preferably 35 mm or more, and 120 mm or less, preferably 100 mm or less. <9> Or <31> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <33> The length L3 along the vertical direction of the non-existent region existing within the panel-existent region is 1 mm or more, preferably 2 mm or more, and 15 mm or less, preferably 10 mm or less. <9> Or <32> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <34> The length L4 along the longitudinal direction of the core existing region existing within the panel existing region is 2 mm or more, preferably 3 mm or more, and 80 mm or less, preferably 75 mm or less. <9> Or <33> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. [Explanation of symbols]

[0075] 1. Disposable diapers (absorbent articles) F ventral part M Inseam R dorsal part 2 Surface sheet 3 Back sheet 4. Absorber 40 absorbent core 41 Upper absorbent core 42 Lower absorbent core 49 Core Wrap Sheet 6 Side Panel 7 Fastening Tape 8 Side fastening part A1 Non-existent area A2 Core region A3 Core lamination area A4 sheet area X vertical direction Y horizontal direction Z thickness direction

Claims

1. An absorbent article having a vertical direction corresponding to the front-to-back direction of a wearer and a horizontal direction perpendicular to the vertical direction, and having a crotch portion arranged in the crotch area of ​​the wearer, a ventral portion arranged closer to the wearer's ventral side than the crotch portion, and a dorsal portion arranged closer to the wearer's back than the crotch portion in the vertical direction, The absorbent article includes an absorbent body including an absorbent body, The absorbent body includes a core wrap sheet and an absorbent core, The absorbent core comprises an upper absorbent core located on the skin-facing side and a lower absorbent core located on the non-skin-facing side, The absorbent article includes a pair of fastening portions extending laterally outward from both side edges along the longitudinal direction of the absorbent main body in the back side portion, Each fastening portion includes a side panel extending laterally outward from a side edge portion of the absorbent main body, and a fastening tape extending laterally outward from the side panel, each side panel having a plurality of laterally extending and longitudinally spaced elastic members; An absorbent article in which, in a plan view, when the absorbent body is viewed from the outside in the vertical direction to the inside in the vertical direction along a vertical center line that divides the absorbent body in half horizontally and extends vertically, the vertical end of the absorbent core is located in a tape presence area, which is an area that vertically overlaps with the fastening tape on the absorbent body.

2. The absorbent article according to claim 1 , wherein the upper absorbent core is formed by mixing and stacking absorbent fibers and absorbent polymers.

3. 3. The absorbent article according to claim 1, wherein the lower absorbent core comprises a layer of water-absorbent polymer sandwiched between two fibrous sheets.

4. 3. The absorbent article according to claim 1, wherein, when the absorbent body is viewed in the longitudinal direction, at least a portion of a core presence area in which the upper absorbent core is absent and the lower absorbent core is present is located in the tape presence area.

5. In a plan view, when the absorbent main body is viewed from the outside in the vertical direction to the inside in the vertical direction along a vertical center line that divides the absorbent main body in half laterally and extends vertically, a panel presence region that is a region on the absorbent main body that overlaps with the side panel in the vertical direction is an absorbent-free region; a core presence region where the upper absorbent core is absent and the lower absorbent core is present; and The absorbent article according to claim 1 or 2, wherein the upper absorbent core and the core lamination region where the lower absorbent core are present are arranged in this order.

6. An absorbent article as described in claim 5, wherein when the absorbent body is viewed from the outside in the vertical direction along the vertical center line to the inside in the vertical direction, a sheet presence area is further arranged between the non-existence area and the core presence area, in which a sheet material including the core wrap sheet is present.

7. the lower absorbent core has a polymer-free region in its longitudinal end region where no water-absorbing polymer is present between the two fibrous sheets; The absorbent article according to claim 6 , wherein the core wrap sheet and a fibrous sheet material located in the polymer-free region are disposed in the sheet-present region.

8. In the panel presence region, when the absorbent main body is viewed from the outside in the longitudinal direction to the inside in the longitudinal direction along the longitudinal center line, an absorbent-free region; a sheet presence region where a sheet material including the core wrap sheet is present; a core presence region where the upper absorbent core is absent and the lower absorbent core is present; and a core lamination region in which the upper absorbent core and the lower absorbent core are present, arranged in this order; The absorbent article according to claim 5 , wherein the thickness of each region increases in the order of the non-existent region, the sheet-existing region, the core-existing region, and the core-laminated region.

9. An absorbent article as described in claim 5, wherein, when the absorbent body is viewed from the outside in the vertical direction toward the inside in the vertical direction along the vertical center line, the core stacking region and the core presence region are located in an elastic member presence region which is a region that overlaps vertically with the region where the elastic member is present on the side panel on the absorbent body.

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