absorbent articles

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 members 8 constituted by including a side panel 6. When viewing the absorbent body 5 along a longitudinal direction X, in a range of 30% or less of the length in the longitudinal direction X in a panel existence region A7 which is a region overlapping in the longitudinal direction on the side panel 6 on the absorbent body 5, a longitudinal end zone of the absorber 4 exists. Instead of this, the panel existence region A7 and the longitudinal end zone of the absorber 4 are not overlapped with each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Conventionally, flat-type disposable diapers have been known in which side panels that stretch in the width direction of the absorbent main body and have fastening tapes are attached to the portion of the absorbent main body 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 liquid 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 and having a larger planar area than the upper absorbent core. The upper absorbent core is preferably a mixed stack containing water-absorbent fibers and water-absorbent polymers. The lower absorbent core is preferably an absorbent sheet having a layer of water-absorbent polymer formed between two fibrous sheets. The absorbent article preferably includes a pair of fastening members fixed to both side edge portions along the longitudinal direction of the absorbent main body in the back portion so as to extend laterally outward from the both side edge portions. It is preferable that each of the fastening members includes a side panel. It is preferable that, in a planar view of the absorbent body and on a vertical center line extending vertically and dividing the absorbent body horizontally in half, the lower absorbent core is present in part or the entire panel presence area, which is an area that vertically overlaps with the side panel on the absorbent body, and that the upper absorbent core and the lower absorbent core are present within a range of 30% or less of the vertical length of the panel presence area. Alternatively, it is preferable that the upper absorbent core is not present in the panel presence area. [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 Figure 1 is an embodiment of a flat-type diaper. As shown in the figure, the diaper 1 has a longitudinal direction X extending from the wearer's abdomen through the crotch area to the back, and a transverse 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 fastening members 8, 8 fixed to both side edge portions 5S, 5S along the longitudinal direction X of the absorbent main body 5 in the back-side portion R. The diaper 1 is formed symmetrically with respect to a longitudinal center line CLx that bisects the absorbent main body 5 in the transverse direction Y and extends in the longitudinal direction X. The pair of fastening members 8, 8 are fixed to the absorbent main body 5 so as to extend outward in the transverse direction Y from both side edge portions 5S, 5S of the absorbent main body 5 in the back-side portion R.

[0014] The top sheet 2 and the back sheet 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 top sheet 2 and the back sheet 3 are joined to each other by known joining means such as adhesive, heat sealing, ultrasonic sealing, etc. 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 the figure 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 multiple 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] Each absorbent core 41, 42 has a rectangular shape in a plan view, and is disposed continuously from the ventral portion F to the dorsal portion R. In this embodiment, 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. In addition, each absorbent core 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. On the other hand, each absorbent core 41, 42 is disposed such that the side edges in the longitudinal direction X in the dorsal portion R are different from each other.

[0017] 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.

[0018] 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).

[0019] Any material commonly used to form this type of absorbent core can be used for the absorbent core 40, without any particular restrictions. The absorbent core 40 is composed of, for example, a stack of absorbent fibers such as pulp, a mixed stack of absorbent fibers and a water-absorbent polymer, a pile of absorbent polymer, or an absorbent sheet in which a layer of absorbent polymer is formed between the same or two different fibrous sheets. A combination of these materials can be used. 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. Furthermore, as described above, the thickness of the lower absorbent core 42 is configured to be thinner than the thickness of the upper absorbent core 41, and for example, the stacking state of the fiber stack can be changed to configure each absorbent core 41, 42 to have different basis weights.

[0020] Of these, the upper absorbent core 41 is made of a mixed laminate consisting of absorbent fibers and absorbent polymers. The use of the mixed laminate improves the absorption and retention of excreted liquids such as urine, preventing leakage of the liquid to the outside of the diaper. In particular, the abdominal region F and the crotch region M are areas where a large amount of excreted liquid tends to accumulate, so by using the mixed laminate, the absorbency of the liquid can be improved and leakage can be prevented.

[0021] The lower absorbent core 42 is made of an absorbent sheet in which a layer of 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. As such an absorbent sheet, for example, the one described in International Publication No. 2021 / 132338 can be used.

[0022] 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.

[0023] The diaper 1 is provided with a pair of fastening members 8, 8 fixed to both side edge portions 5S, 5S of the absorbent main body 5 in the longitudinal direction X in the back-side portion R. The pair of fastening members 8, 8 are fixed to the absorbent main body 5 so as to extend outward in the lateral direction Y from both side edge portions 5S, 5S of the absorbent main body 5 in the back-side portion R.

[0024] 1, each of the pair of fastening members 8, 8 includes a stretchable side panel 6 fixed to the absorbent main body 5 so as to extend outward in the lateral direction Y from a side edge portion 5S of the absorbent main body 5. In addition, the fastening member 8 preferably 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 above-mentioned side panel 6 and fastening tape 7 constituting the fastening member 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 laterally 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 3) by a 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 part 72 is fixed to the skin-facing surface of the tape substrate 71. The fastening part 72 is made of, for example, a mechanical hook-and-loop fastener or a fastening agent, and can be removably attached to a fastening area (not shown) formed on the non-skin-facing surface of the abdominal part F of the diaper 1.

[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, spunbonded nonwoven fabrics, and meltblown nonwoven fabrics, woven fabrics, knitted fabrics, paper, resin films, etc., or sheet materials made 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] 1, abdominal flaps 59, 59 are formed on both side edges 5S, 5S of the absorbent main body 5 in the longitudinal direction X of the abdominal portion F. The abdominal flaps 59 are made of a non-stretchable sheet material, and like the side panels 6, the inner edges of the sheet material are 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 of the fastening member 8 and the position of the absorbent body have a predetermined relationship. For convenience of explanation, the following description will mainly focus on the back portion R. In addition, the following description will be given taking as an example a preferred embodiment of the present invention in which the upper absorbent core 41 is a mixed stack, the lower absorbent core 42 is an absorbent sheet, and the lower absorbent core 42 in the back portion R extends outward in the longitudinal direction X beyond the longitudinal X-side edge of the upper absorbent core 41 to increase its planar area. However, the following description will be similarly applied to embodiments other than this embodiment as long as the effects of the present invention are achieved.

[0032] Specifically, when the absorbent main body 5 in the back region R of the diaper 1 is viewed along the longitudinal direction X, the upper absorbent core 41 is present on the longitudinal centerline CLx in an area that is 30% or less of the longitudinal length of the panel presence region, which is an area that overlaps with the side panels 6 on the absorbent main body 5 in the longitudinal direction X. In addition, the lower absorbent core 42 is present in part or the entirety of the panel presence region. Alternatively, a configuration is possible in which the upper absorbent core 41 is not present in the panel presence region. More specifically, a configuration is possible in which neither the upper absorbent core 41 nor the lower absorbent core 42 is present in the panel presence region, or a configuration is possible in which the upper absorbent core 41 is not present but the lower absorbent core 42 is present.

[0033] In this embodiment, the former configuration is adopted, that is, the lower absorbent core 42 is disposed in a portion of the panel presence region, and the lower absorbent core 42 is disposed continuously so as not to reach the outer end of the panel presence region in the longitudinal direction X. The upper absorbent core 41 is disposed continuously within an area of ​​30% or less of the longitudinal length based on the inner end of the panel presence region in the longitudinal direction X. This is synonymous with the fact that a core lamination region A3 (see FIG. 1), which will be described later, exists in the panel existing region so as to satisfy a predetermined L2 / L1 ratio.

[0034] In this embodiment, in addition to the upper absorbent core 41 and the lower absorbent core 42, a core wrap sheet 49 is also arranged in a portion of the panel existence region. In other words, an end region of the core stacking region A3 in the longitudinal direction X exists in a portion of the panel existence region. The core stacking region A3 exists so as to extend outward in the longitudinal direction X from an inner end of the panel existence region in the longitudinal direction X.

[0035] The "panel presence region" is a region on the absorbent main body 5 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. By having a predetermined proportion of the end region of the absorbent body 4 in the longitudinal direction X in the panel presence area A7, gaps are less likely to form between the wearer's back and the diaper 1 when the diaper is worn, improving the fit and preventing liquid leakage, particularly from the back side.

[0036] When the core laminated region A3 is present within the panel presence region A7, the length of the panel presence region A7 along the longitudinal direction X is defined as L1, and the length of an end region of the core laminated region A3 within the panel presence region A7 along the longitudinal direction X is defined as L2. The ratio of L2 to L1 (L2 / L1) is preferably 30% or less, more preferably 25% or less, even more preferably 20% or less, and even more preferably 10% or less, with the lower limit being 0%. This arrangement improves both liquid absorption and retention and fit, and effectively prevents liquid leakage from the back side. 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.

[0037] In the panel presence region A7, when the absorbent main 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, it is preferable that the panel presence region A7 has a plurality of regions made of different constituent materials. In detail, when the absorbent main body 5 is viewed from the outside in the longitudinal direction X toward the inside in the longitudinal direction X, it is preferable that a core presence region A2 (see FIG. 3) in which the upper absorbent core 41 is absent and the lower absorbent core 42 is present among the constituent materials of the absorbent body 4, and a core stacking region A3 (see FIG. 2) in which the upper absorbent core 41 and the lower absorbent core 42 are present, are formed in this order. In addition, it is also preferable that a non-presence region A1 (see FIG. 4) in which the absorbent body 4 is absent is formed in an area outer than the core presence region A2 in the longitudinal direction X. 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.

[0038] 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, and for example, only the absorbent cores 41, 42 may be present, or in addition, a core wrap sheet 49 may also be present. In this embodiment, the core lamination region A3 is present with the core wrap sheet 49 and both absorbent cores 41, 42.

[0039] As described above, by having a plurality of regions made of different constituent materials, the absorbent main body 5 in the panel region A7 has a structure in which the number of constituent members decreases from the inside to the outside in the longitudinal direction X, and therefore the rigidity of the panel region A7 decreases stepwise. As a result, the diaper 1 can be effectively fitted along the back of the wearer, and leakage from the back can be more effectively prevented.

[0040] To further enhance the above-mentioned effects, it is preferable that the end of the upper absorbent core 41 in the longitudinal direction X is located near the inner end of the panel presence region in the longitudinal direction X. In this case, the end of the upper absorbent core 41 in the longitudinal direction X may be located outward or inward from the inner end of the panel presence region in the longitudinal direction X. More preferably, the end of the upper absorbent core 41 in the longitudinal direction X is located inward from the inner end of the panel presence region in the longitudinal direction X. On the other hand, it is preferable that the end of the lower absorbent core 42 in the longitudinal direction X is positioned outward from the inner end of the panel presence region in the longitudinal direction X.

[0041] In the embodiment shown in FIG. 1, a non-existence region A1 exists in the panel presence region A7. The non-existence region A1 (see FIG. 4), 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-side portion R shown in FIG. 1, the non-existence region A1 is a region on the absorbent main body 5 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 among the portions of the back-side portion R where the components of the absorbent body 4 are present. In this embodiment, the non-existence region A1 is located in an outer region in the longitudinal direction X of the panel presence region A7. 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.

[0042] 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 of the back portion R shown in FIG.

[0043] As shown in FIG. 3, the core-existing region A2 is a region of the constituent material of the absorbent body 4 where the upper absorbent core 41 is not present and the lower absorbent core 42 is present. The core-existing region A2 of this embodiment is a region where the upper absorbent core 41 of the constituent materials of the absorbent body 4 is not present, but where the core wrap sheet 49 and the lower absorbent core 42 are present. The core presence region A2 is located inward in the vertical direction X from the non-existence region A1 and outward in the vertical direction from the core stacking region A3, and the non-existence region A1 and the core presence region A2 are adjacent to the core presence region A2 and the core stacking region A3, respectively. The end of the core presence region A2 in the longitudinal direction X is preferably located outward from the inner end in the longitudinal direction X of the tape presence region (region indicated by reference symbol A9 in FIG. 1), which is a region that overlaps with the fastening tape 7 on the absorbent main body 5 in the longitudinal direction X. More preferably, the end of the core presence region A2 in the longitudinal direction X is disposed within the tape presence region.

[0044] 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.

[0045] When the length of the core presence region A2 present in the panel presence region A7 along the longitudinal direction X is defined as length L4, the ratio of length L4 to length L1 (L4 / L1) is preferably 50% or more, more preferably 60% or more, and is preferably 100% or less, more preferably 80% or less. The above-mentioned length ratio is synonymous with the core presence region A2 being present within the above-mentioned range of the longitudinal length of the panel presence region A7 when the absorbent main body 5 is viewed along the longitudinal direction.

[0046] The length L4 is the length along the vertical direction X from the inner end of the non-existence region A1 in the vertical direction X to the outer end of the core laminated region A3 in the vertical direction X (specifically, the outer end of the upper absorbent core 41 in the vertical direction X) in the back side portion R in the plan view shown in Figure 1. This arrangement improves the fit and effectively prevents fluid leakage from the back side. In a particularly preferred embodiment of the present invention, the core presence region A2 is configured to include the lower absorbent core 42, or an absorbent sheet is used as the lower absorbent core 42, thereby making the region near the side panel 6 thin and reducing the rigidity of the back side portion R. As a result, while maintaining the fluid absorption and retention properties of the back side portion R, gaps are less likely to form between the wearer's back and the diaper 1, improving the fit and preventing fluid leakage, particularly from the back side.

[0047] 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.

[0048] 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 core presence region A2 is present in a tape presence region, which is a region where at least a portion of the core presence region A2, where the upper absorbent core 41 is absent and the lower absorbent core 42 is present, longitudinally overlaps with the fastening tape 7 on the absorbent main body 5. In other words, it is also preferable that the core stacking region A3 is not present in the tape presence region. In other words, it is preferable that the upper absorbent core 41 is not present in the tape presence region. In addition, it is also preferable that the core presence region A2 is present so as to include the longitudinal center of the tape presence region.

[0049] In this embodiment, the tape presence area does not include a core stacking area A3 that includes an upper absorbent core 41, but includes a core presence area A2 that does not include an upper absorbent core 41. The longitudinal X edge of the core presence area A2 is located outward in the longitudinal X direction from an imaginary line connecting the longitudinal X centers of the tape presence area. Furthermore, no non-presence area A1 exists within the tape presence area.

[0050] The "tape presence region" is a region on the absorbent main body 5 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. Generally, a wearer puts on an open-type disposable diaper by grasping the fastening tape 7 at and near the center in the longitudinal direction X and stretching it in the transverse direction Y. Therefore, the presence of the core presence region A2 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 forming between the wearer's back and the diaper 1. This improves the fit and more effectively prevents liquid leakage, particularly from the back side.

[0051] When the length of the tape presence region A9 along the longitudinal direction X is defined as length L8 and the length of the core presence region A2 within the tape presence region A9 along the longitudinal direction X is defined as length La, the ratio of length La to length L8 (La / L8) is preferably 50% or more, more preferably 55% or more, and is preferably 100% 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 side.

[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 La is the length along the longitudinal direction X from the imaginary line R8 connecting the outer ends of each fastening tape 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 tape presence area A9 in the back portion R in the plan view shown in Figure 1.

[0053] 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 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.

[0054] 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 with the side panel 6 on the absorbent main body 5 in the vertical direction X), 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.

[0055] 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 panel region A7 has a structure in which the number of components gradually decreases from the inside to the outside in the longitudinal direction X, which facilitates the formation of gradually reduced portions of rigidity in the panel region A7. As a result, the diaper 1 can be effectively fitted along the back of the wearer, and leakage from the back can be more effectively prevented. To make this effect even more pronounced, it is preferable that the end of the sheet presence area A4 in the longitudinal direction X be located outward from the inner end of the tape presence area A9 in the longitudinal direction X. In particular, it is preferable that the end of the sheet presence area A4 in the longitudinal direction X be located outward from the outer end of the tape presence area A9 in the longitudinal direction X.

[0056] 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 FIG. 6, the upper absorbent core 41 is not present in the sheet presence area A4. In the embodiment shown in the same figure, when focusing on the lower absorbent core 42 in the form of an absorbent sheet, the sheet presence area A4 is a region formed so that two identical or different fibrous sheet materials 43, 44 are present together, but no particles of the water-absorbent polymer 45 are present. 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 by a core wrap sheet 49.

[0057] 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. The polymer-free region may be formed at least in the end region in the longitudinal direction X of the absorbent sheet located on the back side R side of the diaper 1, and may also be formed in the end region in the longitudinal direction of the other side (ventral side F) or in the end region in the transverse direction Y. The formation of the polymer-free region prevents the water-absorbent polymer 45 from falling out of the absorbent sheet, thereby further improving the liquid absorption and retention properties of the absorbent core 4. Alternatively, if each absorbent core 41, 42 or the core presence region A2 is configured in a manner that does not include sheet material such as a mixed stack, the sheet presence region A4 can be, for example, a region where each absorbent core 41, 42 is not present and where only the core wrap sheet 49, among the constituent components of the absorbent body 4, is present.

[0058] 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 1.

[0059] 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.

[0060] 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-existing region A4 is preferably 1.5 mm or more, more preferably 2.5 mm or more, and is preferably 8.5 mm or less, 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.

[0061] 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 70 mm or more, more preferably 75 mm or more, and preferably 150 mm or less, more preferably 120 mm or less. The length L2 of the core laminate region A3 in the panel existing region A7 along the longitudinal direction X can be changed as appropriate depending on the desired shape of the diaper 1, but is preferably 30 mm or less, more preferably 25 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 40 mm or more, more preferably 50 mm or more, and preferably 140 mm or less, more preferably 100 mm or less.

[0062] 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 La along the longitudinal direction X of the core presence region A2 present within the tape presence region A9 can be changed as appropriate depending on the desired shape of the diaper 1, but is preferably 5 mm or more, more preferably 10 mm or more, and preferably 50 mm or less, more preferably 40 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.

[0063] 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.

[0064] 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 and having a larger planar area than the upper absorbent core, the upper absorbent core is a mixed stack containing water-absorbent fibers and water-absorbent polymers, the lower absorbent core is an absorbent sheet having a layer of water-absorbent polymer formed between two fibrous sheets, The absorbent article includes a pair of fastening members disposed on both side edges along the longitudinal direction of the absorbent main body in the back portion so as to extend laterally outward from the both side edges, Each fastening member includes a side panel, In a plan view of the absorbent body, on a vertical center line extending vertically and dividing the absorbent body in half horizontally, the lower absorbent core is present in a part or all of a panel presence region, which is a region that overlaps vertically with the side panel on the absorbent body, and the upper absorbent core and the lower absorbent core are present in a core stacking region within a range of 30% or less of the vertical length of the panel presence region; or An absorbent article in which the upper absorbent core is not present in the panel presence area.

[0065] <2> In a plan view, when the absorbent main body is viewed from the outside in the longitudinal direction to the inside in the longitudinal direction along a longitudinal center line that divides the absorbent main body in half in the horizontal direction and extends in the vertical direction, a core-existing region in which the upper-layer absorbent core is absent and the lower-layer absorbent core is present, and the core-stacking region are arranged in this order, When the absorbent body is viewed in the longitudinal direction, the core presence region is present in a range of 50% or more of the longitudinal length of the panel presence region. <1> The absorbent article according to claim 1. <3> The length of the panel presence area along the vertical direction is defined as L1, When the length along the vertical direction of the core existing region existing in the panel existing region is defined as length L4, The ratio of the length L4 to the length L1 (L4 / L1) is 50% or more, preferably 60% or more, and 100% or less, preferably 80% or less. <2> The absorbent article according to claim 1. <4> The length L4 along the longitudinal direction of the core existing region existing within the panel existing region is 40 mm or more, preferably 50 mm or more, and 140 mm or less, preferably 100 mm or less. <2> or <3> The absorbent article according to claim 1. <5> 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. <2> Or <4> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <6> the thickness of the lower absorbent core is thinner than the thickness of the upper absorbent core; <1> Or <5> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material.

[0066] <7> Each of the side panels has a plurality of laterally extending and longitudinally spaced elastic members. <1> Or <6> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <8> Each fastening member further includes a fastening tape fixed to the side panel so as to extend laterally outward from the side panel, At least a part of the core-existing region where the upper absorbent core is not present and the lower absorbent core is present is present in a tape-existing region which is a region overlapping the fastening tape on the absorbent main body in the longitudinal direction. <1> Or <7> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <9> Each fastening member further includes a fastening tape fixed to the side panel so as to extend laterally outward from the side panel, When the absorbent main body is viewed in the longitudinal direction, the upper absorbent core is not present in a tape presence region, which is a region on the absorbent main body that overlaps with the fastening tape in the longitudinal direction, the core-existing region where the upper absorbent core is absent and the lower absorbent core is present is present so as to include the longitudinal center of the tape-existing region; <1> Or <8> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <10> 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. <8> or <9> The absorbent article according to claim 1. <11> The length La of the core-existing region in the tape-existing region along the longitudinal direction is 5 mm or more, preferably 10 mm or more, and 50 mm or less, preferably 40 mm or less. <8> Or <10> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material.

[0067] <12> In a plan view, when the absorbent main body is viewed from the outside in the longitudinal direction to the inside in the longitudinal direction along a longitudinal center line that divides the absorbent main body in half in the horizontal direction and extends in the vertical direction, a core-existing region in which the upper-layer absorbent core is absent and the lower-layer absorbent core is present, and the core-stacking region are arranged in this order, 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 existing region existing in the tape existing region is defined as length La, The ratio of the length La to the length L8 (La / L8) is 50% or more, preferably 55% or more, and 100% or less, preferably 85% or less. <8> 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, When the length along the longitudinal direction of the longitudinal end region of the core laminated region existing in the panel existing region is length L2, The ratio of the length L2 to the length L1 (L2 / L1) is 30% or less, preferably 25% or less, more preferably 20% or less, and even more preferably 10% or less, with the lower limit being 0%. <1> Or <12> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <14> The length of the panel presence area along the vertical direction is defined as L1, When the length along the vertical direction of the region in which the absorber is not present within the panel presence region 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. <1> Or <13> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <15> The length of the panel presence area along the vertical direction is defined as L1, When the length along the vertical direction of the area where the sheet material including the core wrap sheet exists in the panel existence area is length Le, 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. <1> Or <14> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <16> The thickness H1 in the region where the absorbent body is not present is 1 mm or more, preferably 2 mm or more, and 8 mm or less, preferably 6 mm or less. <1> Or <15> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material.

[0068] <17> The thickness H4 in the region where the sheet material including the core wrap sheet exists is 1.5 mm or more, preferably 2.5 mm or more, and 8.5 mm or less, preferably 6.5 mm or less. <1> Or <16> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <18> 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. <1> Or <17> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <19> The length L1 of the panel area along the vertical direction is 70 mm or more, preferably 75 mm or more, and 150 mm or less, preferably 120 mm or less. <1> Or <18> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <20> The length L2 along the longitudinal direction of the core laminated region present in the panel existing region is 30 mm or less, preferably 25 mm or less. <1> Or <19> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <21> The length L3 along the vertical direction of the region in the panel presence region where the absorber is not present is 1 mm or more, preferably 2 mm or more, and 15 mm or less, preferably 10 mm or less. <1> Or <20> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. <22> The length Le along the longitudinal direction of the region where the sheet material including the core wrap sheet exists is 2 mm or more, preferably 5 mm or more, and 30 mm or less, preferably 20 mm or less. <1> Or <21> 10. The absorbent article according to claim 9, wherein the absorbent article is a fibrous material. [Explanation of symbols]

[0069] 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 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 and having a larger planar area than the upper absorbent core, the upper absorbent core is a mixed stack containing water-absorbent fibers and water-absorbent polymers, the lower absorbent core is an absorbent sheet having a layer of water-absorbent polymer formed between two fibrous sheets, The absorbent article includes a pair of fastening members disposed on both side edges along the longitudinal direction of the absorbent main body in the back portion so as to extend laterally outward from the both side edges, Each fastening member includes a side panel, In a plan view of the absorbent main body, on a vertical center line extending vertically and dividing the absorbent main body in half laterally, the lower absorbent core is present in a part or all of a panel presence region which is a region on the absorbent main body that overlaps with the side panel in the vertical direction, and the absorbent main body has a core stacking region in which the upper absorbent core and the lower absorbent core are present within an area of ​​30% or less of the vertical length of the panel presence region, 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, a sheet presence area in which only the core wrap sheet and the fibrous sheet material are present among the constituent components of the absorbent body, a core presence area in which the upper absorbent core is not present but the lower absorbent core is present, and the core stacking area are arranged in this order in the panel presence area.

2. An absorbent article as described in claim 1, wherein, when the absorbent body is viewed along the vertical direction, the core presence region is present within a range of 50% or more of the vertical length of the panel presence region.

3. The absorbent article according to claim 1 or 2, wherein the thickness of the lower absorbent core is thinner than the thickness of the upper absorbent core.

4. The absorbent article according to any one of claims 1 to 3, wherein each of the side panels has a plurality of laterally extending and longitudinally spaced apart elastic members.

5. Each fastening member further includes a fastening tape fixed to the side panel so as to extend laterally outward from the side panel, An absorbent article as described in any one of claims 1 to 4, wherein, when the absorbent body is viewed in the vertical direction, at least a portion of the core presence area where the upper absorbent core is not present and the lower absorbent core is present is located in a tape presence area, which is an area that overlaps the fastening tape on the absorbent body in the vertical direction.

6. Each fastening member further includes a fastening tape fixed to the side panel so as to extend laterally outward from the side panel, When the absorbent main body is viewed in the longitudinal direction, the upper absorbent core is not present in a tape presence region, which is a region on the absorbent main body that overlaps with the fastening tape in the longitudinal direction, The absorbent article according to any one of claims 1 to 5, wherein the core presence region where the upper absorbent core is absent and the lower absorbent core is present is present so as to include the longitudinal center portion of the tape presence region.

7. Each of the fastening members further comprises a fastening tape fixed to the side panel so as to extend laterally outward from the side panel; An absorbent article as described in any one of claims 1 to 6, wherein, in a plan view, the vertical end of the sheet presence area is located outward from the vertical inner end of the tape presence area, which is an area that vertically overlaps with the fastening tape on the absorbent body.

Images