Diaper

Abstract

This diaper comprises: an absorbent body including a back surface sheet disposed on a non-skin surface side of a wearer, an absorber disposed between a skin surface sheet and the back surface sheet, and a printed sheet disposed on a skin surface side relative to an absorbent core, and on which a guide mark for guiding a position at which a part of the body of the wearer is to be placed is printed; and a pair of fastening tabs. The distance in a longitudinal direction between an end portion of the printed sheet on at least one side in the longitudinal direction and the guide mark is 1 / 2 or more of the length of the guide mark in the longitudinal direction. Between the printed sheet and an adjacent sheet adjacent to the printed sheet on at least one of the skin surface side and the non-skin surface side, the density of a sheet positioned on the skin surface side of the printed sheet and the adjacent sheet is lower than the density of a sheet positioned on the non-skin surface side of the printed sheet and the adjacent sheet.

Description

Diaper

[0001] This disclosure relates to diapers.

[0002] Patent Document 1 describes a diaper with a surface sheet on which a guiding mark for guiding the wearer's buttocks position is displayed, a back sheet (cover sheet), an absorbent core (absorbent body) disposed between the surface sheet and the back sheet, and a pair of fastening tabs (locking portions).

[0003] Japanese Patent Application Laid-Open No. 2014-230716

[0004] In a diaper as described above, it is required to appropriately exert the function of the guiding mark and improve the usability of the diaper itself.

[0005] An object of this disclosure is to provide a diaper that can appropriately exert the function of the guiding mark and improve the usability. [[ID=1十七]]

[0006] A diaper according to one embodiment is a diaper extending in a longitudinal direction connecting the ventral side to the dorsal side of the wearer and a lateral direction perpendicular to the longitudinal direction, and includes a back sheet disposed on the non-skin side opposite to the skin side of the wearer, an absorber including an absorbent core disposed closer to the skin side than the back sheet, and a printed sheet disposed closer to the skin side than the absorbent core and having a guiding mark printed thereon for guiding the position where a part of the wearer's body should be placed. The diaper further includes an absorbent main body including the above components, and a pair of fastening tabs extending outward in the lateral direction from the absorbent main body. The longitudinal distance between the end of the printed sheet on at least one side in the longitudinal direction and the guiding mark is 1 / 2 or more of the longitudinal length of the guiding mark. Between the printed sheet and an adjacent sheet adjacent to at least one of the skin side and the non-skin side, the density of the sheet located on the skin side among the printed sheet and the adjacent sheet is lower than the density of the sheet located on the non-skin side among the printed sheet and the adjacent sheet.

[0007] According to this disclosure, it is possible to provide a diaper that can appropriately exert the function of the guiding mark and improve the usability.

[0008] This is a plan view of the diaper according to the embodiment, seen from the skin-facing side. This is a plan view of the diaper in Figure 1, seen from the non-skin-facing side. This is a cross-sectional view of the diaper along line III-III in Figure 1. This is a plan view of the diaper according to the first modified example, seen from the non-skin-facing side. This is a cross-sectional view showing the structure of the surface sheet of the diaper according to the second and third modified examples.

[0009] At least [1] to

[12] embodiments are disclosed in this specification and the accompanying drawings.

[0010] [1] A diaper extending in a longitudinal direction connecting the ventral side to the dorsal side of the wearer, and in a transverse direction perpendicular to the longitudinal direction, comprising: an absorbent body including a backing sheet disposed on the non-skin side opposite to the skin side of the wearer; an absorbent core disposed on the skin side of the backing sheet; and a printed sheet disposed on the skin side of the absorbent core and printed with guide marks for guiding the position where a part of the wearer's body should be placed; and a pair of fastening tabs extending outward in the transverse direction from the absorbent body, wherein the longitudinal distance between at least one end of the printed sheet in the longitudinal direction and the guide marks is 1 / 2 or more of the longitudinal length of the guide marks, and between the printed sheet and the adjacent sheet adjacent to the printed sheet on at least one side of the skin side and the non-skin side, the density of the printed sheet and the adjacent sheet located on the skin side is lower than the density of the printed sheet and the adjacent sheet located on the non-skin side.

[0011] In the above-mentioned diaper, the presence of guide marks allows the user to properly understand the position where the wearer's body part should be aligned. This suppresses diaper shifting during wear and improves the fit of the diaper. In addition, at least one vertical margin of the printed sheet on which the guide marks are located is ensured to be at least half the vertical length of the guide marks. This prevents the curled-up portion from overlapping the guide marks even if curling occurs at the corners of the printed sheet during diaper manufacturing (for example, when attaching the printed sheet to an adjacent sheet), thus allowing the guide marks to function properly. Furthermore, since the printed sheet is positioned on the skin-facing side of the absorbent core, liquids that migrate to the absorbent core (such as the wearer's urine) may pass through the printed sheet. However, by making the density of the skin-facing sheet lower than the density of the non-skin-facing sheet between the printed sheet and the adjacent sheet, the liquid draw-in performance from the skin-facing sheet to the non-skin-facing sheet can be optimally maintained. Therefore, with the above-mentioned diaper, the structure of the printed sheet described above allows the guidance mark to function appropriately, and also allows for optimal liquid absorption during use, thereby significantly improving the user experience of the diaper.

[0012] [2] The diaper according to [1], wherein the vertical distance between at least one end of the printed sheet and the guide mark in the vertical direction is greater than or equal to the vertical length of the guide mark.

[0013] According to the above configuration, if curling occurs at the corners of the printed sheet, it is possible to more effectively suppress the curled portion overlapping the guide mark.

[0014] [3] The guide mark is located on the back side of the center line that passes through the center of the absorbent body in the vertical direction and is parallel to the center line in the horizontal direction, and the printed sheet is arranged to cross the center line in the vertical direction, in the diaper of [1] or [2].

[0015] With the above configuration, by extending the printed sheet to the vicinity of the urination point (near the center line in the vertical direction), the liquid draw-in performance for urine excreted near the urination point can be suitably demonstrated. Furthermore, since the printed sheet extends at least from the vertical center line to the area on the back side where the guide marks are printed, urine can be suitably diffused from the center line to the area on the back side via the printed sheet.

[0016] [4] A diaper according to any of [1] to [3], wherein at least one of the vertical ends of the printed sheet coincides with the vertical end of the absorbent body.

[0017] With the above configuration, by aligning the vertical edges of the printed sheet and the absorbent body, the occurrence of curling up of the printed sheet at those edges can be effectively suppressed.

[0018] [5] A diaper according to any of [1] to [4], further comprising a surface sheet placed on the skin side of the wearer, wherein the printed sheet is an intermediate sheet placed between the surface sheet and the absorbent material.

[0019] According to the above configuration, by using the intermediate sheet placed between the surface sheet and the absorbent as a printed sheet, the performance of liquid draw-in and liquid diffusion through the printed sheet can be optimally exhibited.

[0020] [6] The diaper of [5] wherein at least one of the vertical ends of the printed sheet coincides with the vertical end of the absorbent material.

[0021] According to the above configuration, by aligning the longitudinal edges of the printed sheet and the absorbent, the occurrence of curling up of the printed sheet at those edges can be effectively suppressed.

[0022] [7] The diaper of [5] or [6], wherein the density of the printed sheet is higher than the density of the surface sheet.

[0023] With the above configuration, the liquid-drawing performance from the surface sheet to the printed sheet (intermediate sheet) can be effectively utilized.

[0024] [8] A diaper in which the density of the printed sheet is lower than the density of the core wrap that is placed on the skin-facing side of the absorbent core in the absorbent material, any of [5] to [7].

[0025] With the above configuration, the liquid draw-in performance from the printed sheet to the core wrap can be effectively utilized.

[0026] [9] The diaper of [7] wherein the density of the printed sheet is higher than the density of the core wrap that is placed on the skin-facing side of the absorbent core in the absorbent material.

[0027] According to the above configuration, by making the density of the printed sheet higher than that of the surface sheet, the liquid draw-in performance from the surface sheet to the printed sheet can be effectively utilized. On the other hand, by deliberately making the density of the printed sheet higher than that of the core wrap, time can be secured for the liquid to be drawn from the printed sheet to the core wrap, allowing the liquid to diffuse appropriately within the printed sheet.

[0028]

[10] The printed sheet is a core wrap that is placed on the skin-facing side of the absorbent core in the absorbent material, any of the diapers [1] to [4].

[0029] According to the above configuration, by using the core wrap covering the absorbent core as a printing sheet, material costs can be reduced compared to the case where an intermediate sheet for printing is provided. Furthermore, if, for example, the core wrap is used as a printing sheet and an intermediate sheet is also provided, it is possible to suppress the bleeding of the guide mark ink to the skin side and prevent ink from adhering to the wearer's body.

[0030]

[11] Diapers of any of [1] to

[10] in which the guide mark is positioned to overlap with the flat portion of the absorbent core on the skin side.

[0031] In the above configuration, the guide marks are positioned so as not to overlap with non-flat areas such as recesses or slits in the absorbent core. This prevents the shape of the guide marks from being distorted to conform to the shape of the non-flat areas of the absorbent core, thereby preventing the guide marks from hindering their marker function.

[0032]

[12] A diaper according to any of [1] to [4], further comprising a surface sheet positioned on the skin side of the wearer, wherein the surface sheet comprises a first sheet and a second sheet having a smaller lateral width than the first sheet and positioned on the skin side of the first sheet so as to overlap with the lateral central portion of the first sheet, and the guide mark is printed on the non-skin side of the second sheet or on the first sheet, and is covered by the second sheet in a thickness direction perpendicular to the vertical and lateral directions.

[0033] According to the above configuration, when the surface sheet has a two-layer structure, by interposing at least one sheet (second sheet) between the wearer's skin and the guide mark (ink), it is possible to suppress the adhesion of ink to the wearer's skin.

[0034] [Embodiments] Embodiments of the present disclosure will be described below with reference to the drawings. In the following description, the same or equivalent elements will be denoted by the same reference numerals, and redundant descriptions will not be repeated. The dimensional ratios in the drawings do not necessarily match those described.

[0035] Referring to Figures 1 to 3, the structure of a diaper 1, which is an example of an absorbent article according to the embodiment, will be described. Figure 1 is a plan view of the diaper 1 as seen from the skin side Z1. Figure 2 is a plan view of the diaper 1 as seen from the non-skin side Z2. Figure 3 is a schematic cross-sectional view of the diaper 1 along the line III-III shown in Figure 1. Figures 1 and 2 show the diaper 1 in an unfolded state, stretched to a state where no wrinkles are formed. In the following description, unless otherwise specified, the positional relationships will be described in the unfolded state. Note that in the cross-sectional view of Figure 3, for the sake of explanation, each member is shown spaced apart in the thickness direction Z, but in the actual product, they are in contact in the thickness direction Z.

[0036] Diaper 1 is a tape-type disposable diaper. Diaper 1 may be a child's diaper or an adult's diaper. In the following description, the person wearing Diaper 1 is referred to as the "wearer," and the person who puts Diaper 1 on the wearer is referred to as the "user." Typically, the wearer is a child or a person receiving care, and the user is a parent or caregiver.

[0037] As shown in Figure 1, the diaper 1 extends in the transverse direction X, which is aligned with the wearer's waist, and in the longitudinal direction Y, which connects the wearer's ventral side to their back. The transverse direction X corresponds to the width direction of the diaper 1, and the longitudinal direction Y corresponds to the length direction of the diaper 1. The transverse direction X and the longitudinal direction Y are perpendicular to each other. The thickness direction Z is perpendicular to the transverse direction X and the longitudinal direction Y, and includes a skin-facing side Z1 that faces the wearer's skin when worn, and a non-skin-facing side Z2 that faces away from the wearer's skin when worn. The diaper 1 is worn so as to cover the wearer's abdomen, crotch, and back.

[0038] The diaper 1 comprises an absorbent body 2 and a pair of fastening tabs 90. The absorbent body 2 has a ventral edge 2F located on one side in the longitudinal direction Y and a dorsal edge 2R located on the other side in the longitudinal direction Y. When worn, the ventral edge 2F is positioned on the ventral side in the direction of the wearer's waist, and the dorsal edge 2R is positioned on the dorsal side in the direction of the wearer's waist. The distance in the longitudinal direction Y between the ventral edge 2F and the dorsal edge 2R is the total length (maximum length) L1 of the absorbent body 2. In the following description, the side on which the ventral edge 2F is located relative to the dorsal edge 2R in the longitudinal direction Y is referred to as the ventral side, and the opposite side is referred to as the dorsal side.

[0039] The absorbent body 2 has a dorsal region 51 located on the dorsal side, a ventral region 52 located on the ventral side, and an intermediate region 53 located between the dorsal region 51 and the ventral region 52. The width of the intermediate region 53 in the lateral direction X is smaller than the width of the dorsal region 51 and the ventral region 52 in the lateral direction X.

[0040] A pair of flap portions 15 are formed on the dorsal region 51 of the absorbent body 2, extending outward in the lateral direction X from the absorbent body 2. The width of the pair of flap portions 15 in the lateral direction X corresponds to the maximum width of the absorbent body 2.

[0041] A pair of fastening tabs 90 are provided on the pair of flap portions 15, respectively. The pair of fastening tabs 90 extend outward in the lateral direction X from the side edge 2S of the absorbent body 2. Each of the pair of fastening tabs 90 has a base material sheet 91 joined to the flap portion 15 and a joining portion 92 provided on the base material sheet 91. The joining portion 92 is disposed on the surface of the skin side Z1 of the base material sheet 91. The joining portion 92 is, for example, a mechanical fastener and is configured to be joined to a target portion 48 formed on the non-skin side Z2 of the absorbent body 2.

[0042] As shown in FIG. 2, the target portion 48 is provided on the non-skin side Z2 of the ventral region 52 of the absorbent body 2. The target portion 48 has a strip-like shape extending in the lateral direction X. The target portion 48 is disposed ventral to the pair of fastening tabs 90 and engages with the pair of fastening tabs 90. Note that the absorbent body 2 may be configured without the target portion 48, and the joining portion 92 of the pair of fastening tabs 90 may be directly joined to the back sheet 20 of the absorbent body 2 described later.

[0043] As shown in FIGS. 1 to 3, the absorbent body 2 includes a skin surface sheet 10, a back surface sheet 20, and an absorber 30. The skin surface sheet 10 constitutes the surface of the absorbent body 2 that is applied to the wearer and is disposed on the skin side Z1. The skin surface sheet 10 includes a surface sheet 11 disposed at the center in the lateral direction X and covering the absorber 30, and a pair of side sheets 1第十二条を覆う。表面シート11は、例えば着用者の尿を吸収体30側に透過させる液透過性の不織布によって構成され、サイドシート12は、例えば液不透過性の不織布によって構成される。

[0044] As shown in FIG. 3, the inner portions of the pair of side sheets 12 in the lateral direction X are folded back to the non-skin side Z2. Between the folded pair of side sheets 12, a pair of elastic members 13 extended in the longitudinal direction Y are disposed. The pair of side sheets 12 and the pair of elastic members 13 constitute a pair of leak-proof gathers 80. The pair of leak-proof gathers 80 are upright leak-proof gathers and are disposed on the skin side Z1 of the absorber 30.

[0045] As shown in FIG. 1, a pair of leak - proof gathers 80 are arranged outside the absorber 30 in the lateral direction X to suppress leakage of urine discharged to the absorber 30 in the lateral direction X. Each of the pair of leak - proof gathers 80 includes an elastic member 13 extending in the longitudinal direction Y, a standing portion 81 that stands up due to the contraction of the elastic member 13, a lateral fixing portion 82 that serves as a standing fulcrum of the standing portion 81 in the lateral direction X, and a longitudinal fixing portion 83 that serves as a standing fulcrum of the standing portion 81 in the longitudinal direction Y.

[0046] The elastic member 13 extends in the longitudinal direction Y along the inner edge in the lateral direction X of the side sheet 12. The elastic member 13 is made of an elastic material such as rubber or spandex that can contract in the length direction, for example. The elastic members 13 of the pair of leak - proof gathers 80 are arranged apart from each other across the longitudinal center line CW passing through the center of the absorbent body 2 in the lateral direction X, and are fixed to the side sheet 12 in a state of being extended in the longitudinal direction Y. The end portion on the back side of the elastic member 13 is arranged in the back side region 51, and the end portion on the ventral side of the elastic member 13 is arranged in the ventral side region 52.

[0047] The lateral fixing portion 82 is formed in substantially the entire longitudinal direction Y of the absorbent body 2 at a position outside the standing portion 81 in the lateral direction X of the side sheet 12. As an example, the lateral fixing portion 82 is arranged outside the absorbent core 31 in the lateral direction X. The lateral fixing portion 82 is a part of the side sheet 12 and is fixed to the surface sheet 11. The lateral fixing portion 82 serves as a standing fulcrum of the standing portion 81 in the lateral direction X.

[0048] The longitudinal fixing portion 83 is formed inside the lateral fixing portion 82 in the lateral direction X. The longitudinal fixing portion 83 includes a dorsal fixing portion 84 arranged in the dorsal side region 51 and a ventral fixing portion 85 arranged in the ventral side region 52. The dorsal fixing portion 84 and the ventral fixing portion 85 are parts of the side sheet 12 and are fixed to the surface sheet 11. The dorsal fixing portion 84 and the ventral fixing portion 85 serve as the dorsal and ventral standing fulcrums of the standing portion 81, respectively.

[0049] The upright portion 81 is formed between the dorsal fixing portion 84 and the ventral fixing portion 85. That is, the upright portion 81 is positioned inward of the lateral fixing portion 82 in the lateral direction X and inward of the vertical fixing portion 83 in the vertical direction Y. The upright portion 81 is a part of the side sheet 12 that is not fixed to the surface sheet 11. An elastic member 13 is connected to the upright portion 81 in an extended state in the vertical direction Y. When the elastic member 13 contracts in the vertical direction Y, the absorbent body 2 deforms in a closing direction, and the upright portion 81 rises up starting from the lateral fixing portion 82. In this way, urine leakage is prevented when the upright portion 81 rises up in a position that sandwiches the absorbent core 31 from the lateral direction X.

[0050] The backing sheet 20 constitutes the outer surface of the absorbent body 2 when worn, and is positioned on the non-skin side Z2. The backing sheet 20 includes a liquid-impermeable backing film 21 and a backing nonwoven fabric 22 located on the non-skin side Z2 than the backing film 21. The width of the backing film 21 in the lateral direction X is formed to be shorter than the width of the backing nonwoven fabric 22 in the lateral direction X, and the backing nonwoven fabric 22 may extend beyond the backing film 21 on both sides in the lateral direction X. The backing nonwoven fabric 22 constitutes the outermost layer of the diaper 1.

[0051] The absorbent body 30 is positioned between the surface sheet 11 and the back sheet 20. The absorbent body 30 includes an absorbent core 31 and a core wrap 32 that covers the skin-facing side Z1 and the non-skin-facing side Z2 of the absorbent core 31. The absorbent core 31 includes, for example, an absorbent material having water-absorbing properties and absorbs the wearer's urine. The absorbent material is composed of, for example, pulp fibers and superabsorbent polymer (SAP). The core wrap 32 is composed of, for example, tissue. As shown in Figure 3, the upper surface of the skin-facing side Z1 and the lower surface of the non-skin-facing side Z2 of the absorbent core 31 are covered by the core wrap 32. The absorbent body 30 is positioned approximately in the center of the absorbent body 2 in the lateral direction X.

[0052] The absorbent core 31 has a dorsal edge 31R and a ventral edge 31F. In this embodiment, the dorsal edge of the absorbent body 30, which includes the absorbent core 31 and the core wrap 32, substantially coincides with the edge 31R of the absorbent core 31, and the ventral edge of the absorbent body 30 substantially coincides with the edge 31F of the absorbent core 31. The dorsal edge 31R of the absorbent core 31 has a width W1 in the lateral direction X. The width W1 is the maximum width of the absorbent core 31. The width W1 of the dorsal edge 31R is greater than the distance d between the pair of leak-proof gathers 80 in the non-upright state. The ventral edge 31F of the absorbent core 31 has, for example, the same width as the dorsal edge 31R. Note that the absorbent core 31 does not necessarily have to have a maximum width W1 at its edges 31R and 31F. For example, if the absorbent core 31 has a shape in which the corners on both sides of the lateral direction X of the edges 31R, 31F are cut out, the absorbent core 31 may have its maximum width W1 at a position closer to the center of the longitudinal direction Y than to the edges 31R, 31F. A constricted region is formed between the ventral edge 31F and the dorsal edge 31R, where the width of the absorbent core 31 is narrowed. The constricted region is, for example, a region of the absorbent core 31 where the width in the lateral direction X is narrowed by 10% or more compared to the width W1 of the ventral edge 31F and the dorsal edge 31R.

[0053] As shown in Figure 1, the diaper 1 further includes an elastic member 40 that is expandable in the longitudinal direction Y. The elastic member 40 is positioned outside the elastic member 13 in the transverse direction X. The dorsal end of the elastic member 40 is positioned in the dorsal area 51, and the ventral end of the elastic member 40 is positioned in the ventral area 52. The elastic member 40 is made of an elastic material such as rubber or spandex that is contractible in the longitudinal direction Y, and extends in the longitudinal direction Y between the skin-facing sheet 10 and the back sheet 20 of the absorbent body 2. When the diaper 1 is worn, the elastic member 40 contracts in the longitudinal direction Y, causing the side edge 2S of the absorbent body 2 to fit around the wearer's legs. That is, the elastic member 40 forms a leg-lengthening gather that expands and contracts along the wearer's legs. Note that the diaper 1 may include multiple elastic members 40. As shown in Figure 1, multiple elastic members 40 are arranged in the transverse direction X outside the elastic member 13 and extend in the longitudinal direction Y parallel to each other.

[0054] The absorbent body 2 has guide marks 60 formed on it to indicate the position where a part of the wearer's body (in this example, the wearer's buttocks) should be placed. In this embodiment, the guide marks 60 are colored on an intermediate sheet 55 (printed sheet), which is a sheet material placed between the surface sheet 11 and the absorbent body 30. The intermediate sheet 55 is, for example, tissue containing pulp. For example, the skin-facing side Z1 of the intermediate sheet 55 is adhered to the surface sheet 11, and the non-skin-facing side Z2 of the intermediate sheet 55 is adhered to the skin-facing side Z1 of the core wrap 32. For example, a hot melt adhesive is used to adhere the intermediate sheet 55. Note that only one of the skin-facing side Z1 and the non-skin-facing side Z2 of the intermediate sheet 55 may be adhered to the surface sheet 11 or the core wrap 32.

[0055] The guide mark 60 may be printed on the skin-facing side Z1 surface 55a of the intermediate sheet 55, or on the non-skin-facing side Z2 (absorbent side 30) surface 55b. From the viewpoint of improving visibility from the skin-facing side Z1, it is preferable that the guide mark 60 be printed on the skin-facing side Z1 surface 55a. On the other hand, from the viewpoint of suppressing ink transfer of the guide mark 60 to the wearer's skin, it is preferable that the guide mark 60 be printed on the non-skin-facing side Z2 surface 55b. The guide mark 60 printed on the intermediate sheet 55 is visible from the skin-facing side Z1 through the surface sheet 11. To prevent misidentification as blood or stool, the guide mark 60 may be printed in ink of a color other than red and yellow. For example, the guide mark 60 may be printed in blue or green. More specifically, the guide mark 60 may be printed in a color included in the range of 5GY to 10RP of the Munsell color circle, for example.

[0056] As shown in Figures 1 and 2, for example, the guide mark 60 has a horizontally elongated shape that is long in the horizontal direction X, and has a shape that resembles the inverted M shape of the buttocks. For example, the guide mark 60 is formed in the second region from the dorsal side (buttock region) when the absorbent body 2 is divided into four sections in the vertical direction Y. The buttock region is located between the transverse center line CL of the absorbent body 2 and the center line between the transverse center line CL and the dorsal edge 2R. The transverse center line CL is the center line of the ventral edge 2F and the dorsal edge 2R in the vertical direction Y, and is the part where a fold is formed when the diaper 1 is folded in half in the vertical direction Y, for example. However, the fold for folding the diaper 1 in half in the vertical direction Y may be formed at a position offset in the vertical direction Y from the transverse center line CL. The intermediate sheet 55 on which the guide mark 60 is printed is formed in a rectangular shape that includes the guide mark 60 and is positioned dorsally from the transverse center line CL. As an example, the width of the intermediate sheet 55 in the lateral direction X is smaller than the maximum width of the absorbent 30 in the lateral direction X. Also, the dorsal edge 55R of the intermediate sheet 55 is located ventral to the dorsal edge 31R of the absorbent 30. In other words, when viewed from the thickness direction Z, the intermediate sheet 55 is contained within the region where the absorbent 30 is located.

[0057] As shown in Figure 2, the distance L3 in the vertical Y direction between the end 55R of the intermediate sheet 55 on at least one side (for example, the back side) and the guide mark 60 (the part of the guide mark 60 that is closest to the back) is at least half the length L2 of the guide mark 60 in the vertical Y direction. In this embodiment, the distance L3 is set to be at least the length L2. Also in this embodiment, the distance in the vertical Y direction between the end 55F of the other side (the front side) of the intermediate sheet 55 and the guide mark 60 (the part of the guide mark 60 that is closest to the front) is also at least half the length L2.

[0058] Furthermore, between the intermediate sheet 55 and the adjacent sheet that is adjacent to it on at least one side of the skin-facing side Z1 and the non-skin-facing side Z2, the density (g・cm³) of the intermediate sheet 55 and the adjacent sheet located on the skin-facing side Z1 is －３The density of the intermediate sheet 55 is lower than that of the sheet located on the non-skin side Z2 among the adjacent sheets. In this embodiment, the sheet adjacent to the intermediate sheet 55 on the skin side Z1 is the surface sheet 11, and the sheet adjacent to the intermediate sheet 55 on the non-skin side Z2 is the core wrap 32 on the skin side Z1. In this case, it is sufficient that the density of the sheet on the skin side Z1 is lower than the density of the sheet on the non-skin side Z2 between the surface sheet 11 and the intermediate sheet 55, or between the intermediate sheet 55 and the core wrap 32 on the skin side Z1. In this embodiment, the above relationship is satisfied in both cases. That is, the density of the surface sheet 11 is lower than the density of the intermediate sheet 55, and the density of the intermediate sheet 55 is lower than the density of the core wrap 32 on the skin side Z1.

[0059] [Function and Effects] The diaper 1 is provided with guide marks 60, which allow the user to properly understand the position where a part of the wearer's body (in this embodiment, the buttocks) should be aligned. This suppresses misalignment of the diaper 1 during wear and improves the fit of the diaper 1. In addition, the margin (L3) in at least one of the vertical directions Y of the intermediate sheet 55 where the guide marks 60 are provided (in this embodiment, both the back and the front) is ensured to be at least half the length L2 of the vertical direction Y of the guide marks 60. As a result, even if curling occurs at the corners of the intermediate sheet 55 during the manufacturing of the diaper 1 (for example, when attaching the intermediate sheet 55 to an adjacent sheet (in this embodiment, the surface sheet 11 or core wrap 32)), the curled-up portion is prevented from overlapping the guide marks 60, thus allowing the above-described function of the guide marks 60 to be properly performed. Furthermore, since the intermediate sheet 55 is positioned on the skin-facing side Z1 of the absorbent core 31, liquids that migrate to the absorbent core 31 (such as the wearer's urine) may pass through the intermediate sheet 55. However, between the intermediate sheet 55 and the adjacent sheet (in this embodiment, at least one of the surface sheet 11 and the core wrap 32 on the skin-facing side Z1), the density of the sheet on the skin-facing side Z1 is lower than the density of the sheet on the non-skin-facing side Z2. This allows for optimal liquid draw-in performance from the sheet on the skin-facing side Z1 to the sheet on the non-skin-facing side Z2. Therefore, with the diaper 1, the structure of the intermediate sheet 55 described above allows the guide mark 60 to function appropriately, and also allows for optimal liquid draw-in performance during use, thus improving the user experience of the diaper 1.

[0060] In diaper 1, the distance L3 in the vertical direction Y between the end 55R of the intermediate sheet 55 on at least one side (the back side in this embodiment) and the guide mark 60 is equal to or greater than the length L2 of the guide mark 60 in the vertical direction Y. With the above configuration, if curling occurs at the corner of the intermediate sheet 55, it is more effectively possible to suppress the curled portion from overlapping the guide mark 60. The distance in the vertical direction Y between the end 55F of the intermediate sheet 55 and the guide mark 60 may also be equal to or greater than the length L2 of the guide mark 60. In this case, the above-mentioned effect can be obtained by ensuring sufficient margin of the intermediate sheet 55 on both sides in the vertical direction Y.

[0061] In diaper 1, the printed sheet on which the guide mark 60 is printed is an intermediate sheet 55 placed between the surface sheet 11 and the absorbent material 30. With the above configuration, by using the intermediate sheet 55 placed between the surface sheet 11 and the absorbent material 30 as the printed sheet, the performance of liquid draw-in and liquid diffusion through the intermediate sheet 55 can be suitably exhibited.

[0062] In diaper 1, the density of the printed sheet (intermediate sheet 55) is higher than that of the surface sheet 11. With the above configuration, the liquid-drawing performance from the surface sheet 11 to the printed sheet (intermediate sheet 55) can be effectively demonstrated.

[0063] In diaper 1, the density of the printed sheet (intermediate sheet 55) is lower than the density of the core wrap 32, which is placed on the skin-facing side Z1 of the absorbent core 31 in the absorbent body 30. With the above configuration, the liquid-drawing performance from the printed sheet (intermediate sheet 55) to the core wrap 32 can be effectively demonstrated.

[0064] Furthermore, as in this embodiment, by configuring the three layers between the printing sheet (intermediate sheet 55) and the adjacent sheets (surface sheet 11 and core wrap 32) on the skin-facing side Z1 and the non-skin-facing side Z2, such that the density of the sheets gradually increases from the skin-facing side Z1 to the non-skin-facing side Z2, it becomes possible to smoothly transfer liquid from the surface sheet 11 on the skin-facing side Z1 to the core wrap 32 on the non-skin-facing side Z2 via the intermediate sheet 55.

[0065] Furthermore, the density of the printed sheet (intermediate sheet 55) may be higher than the density of the core wrap 32, which is positioned on the skin side Z1 of the absorbent core 31 in the absorber 30. That is, the density of the intermediate sheet 55 may be higher than the density of the sheets on both sides of the intermediate sheet 55 in the thickness direction Z. With this configuration, the higher density of the intermediate sheet 55 than the density of the surface sheet 11 allows for effective liquid draw-in from the surface sheet 11 to the intermediate sheet 55. On the other hand, by deliberately making the density of the intermediate sheet 55 higher than the density of the core wrap 32, time is secured for the liquid to be drawn from the intermediate sheet 55 to the core wrap 32, allowing the liquid to diffuse appropriately within the intermediate sheet 55. In other words, with the above configuration, it is possible to achieve both improved liquid draw-in performance and improved liquid diffusion performance.

[0066] Furthermore, in this embodiment, as shown in Figure 1, a pair of channel portions 70 are formed in the absorbent core 31. The pair of channel portions 70 are arranged symmetrically with respect to the longitudinal center line CW of the absorbent body 2. The basis weight of the pair of channel portions 70 is set lower than that of the other parts of the absorbent core 31. Therefore, the density of pulp fibers and superabsorbent polymer present in the pair of channel portions 70 is lower than that of pulp fibers and superabsorbent polymer present in the other parts of the absorbent core 31. In one embodiment, the pair of channel portions 70 may be slits with a basis weight of zero. In the example of Figure 1, the pair of channel portions 70 extend linearly in the longitudinal direction Y, but the pair of channel portions 70 may extend in a curved manner in the longitudinal direction Y. For example, the pair of channel portions 70 overlap with a part of the intermediate sheet 55 in the thickness direction Z, but are positioned ventrally to the guide mark 60. By providing such channel portions 70, the absorbent core 31 can be easily deformed (folded) along the channel portions 70 in response to the movement of the wearer's body. When such a channel portion 70 is provided so as to be exposed on the skin-facing side Z1 of the absorbent core 31, the surface of the skin-facing side Z1 of the absorbent core 31 becomes non-flat in the portion where the channel portion 70 is formed. Furthermore, if the guide mark 60 is positioned to overlap with such a non-flat portion, there is a risk that the shape of the guide mark 60 will be distorted along the non-flat portion.

[0067] From the above viewpoint, it is preferable that the guide mark 60 be positioned so as to overlap with the flat portion of the skin-facing side Z1 of the absorbent core 31. In this embodiment, as described above, the above configuration is achieved by positioning the guide mark 60 so as not to overlap with the pair of channel portions 70 of the absorbent core 31. Note that the configuration in which the guide mark 60 overlaps with the flat portion of the skin-facing side Z1 of the absorbent core 31 can also be achieved by making the entire surface of the skin-facing side Z1 of the absorbent core 31 flat. By positioning the guide mark 60 so as not to overlap with non-flat portions such as recesses or slits provided in the absorbent core 31 as described above, it is possible to prevent the shape of the guide mark 60 from being distorted to conform to the shape of the non-flat portion of the absorbent core 31, thereby preventing the guide mark 60 from hindering its marker function.

[0068] [Variations] The form of the diaper of this disclosure is not limited to the above-described embodiment. The materials and shapes of each component are not limited to those described above, and various materials and shapes can be used. In addition, some of the components included in the above-described embodiment may be changed or omitted, or other components may be added. Several variations of the absorbent article will be described below. The components of the above embodiment and the various variations described thereafter can be combined as appropriate to the extent that they do not contradict each other.

[0069] For example, the printing sheet on which the guide mark 60 is printed may be a core wrap 32 placed on the skin-facing side Z1 of the absorbent core 31 in the absorbent body 30. In this case, the intermediate sheet 55 of the diaper 1 can be omitted. That is, with the above configuration, by using the core wrap 32 that covers the absorbent core 31 as the printing sheet, material costs can be reduced compared to the case in which an intermediate sheet 55 for printing is provided. Alternatively, the core wrap 32 may be used as the printing sheet, and an intermediate sheet may be placed between the surface sheet 11 and the core wrap 32 (the part on which the guide mark 60 is provided). In this case, by sandwiching an intermediate sheet between the guide mark 60 and the surface sheet 11, it is possible to suppress the ink of the guide mark 60 from seeping onto the skin side and prevent the ink from adhering to the wearer's body.

[0070] Figure 4 shows a diaper 1A according to the first modified example. Diaper 1A differs from diaper 1 in that it has an intermediate sheet 55A instead of the intermediate sheet 55. Guide marks 60 are printed on the intermediate sheet 55A, just like on the intermediate sheet 55 of diaper 1. That is, the intermediate sheet 55A is a printed sheet with guide marks 60 printed on it, just like the intermediate sheet 55. On the other hand, the intermediate sheet 55A differs from the intermediate sheet 55 in that at least one end of the intermediate sheet 55A in the vertical direction Y (in this example, the back end 55R) coincides with the edge 31R of the absorbent body 30 in the vertical direction Y. With the above configuration of diaper 1A, by aligning the end 55R of the intermediate sheet 55A with the edge 31R of the absorbent body 30, the occurrence of the intermediate sheet 55A curling up in that portion can be suitably suppressed. For example, during manufacturing, the intermediate sheet 55A and the absorbent 30 (core wrap 32) are cut simultaneously, resulting in a configuration where the end 55R and the edge 31R coincide.

[0071] Furthermore, the intermediate sheet 55A differs from the intermediate sheet 55 in that it is positioned to cross the transverse center line CL in the longitudinal direction Y. That is, the intermediate sheet 55A extends ventrally beyond the transverse center line CL. With the above configuration, by extending the intermediate sheet 55A to the vicinity of the urination point (near the transverse center line CL in the longitudinal direction Y), the liquid draw-in performance for urine excreted near the urination point can be suitably exhibited. In addition, since the intermediate sheet 55A extends at least from the transverse center line CL to the dorsal region where the guide mark 60 is printed, urine can be suitably diffused from the transverse center line CL to the dorsal region via the intermediate sheet 55A.

[0072] Figure 5(A) shows a diaper 1B according to a second modified example. Diaper 1B differs from diaper 1 in that the surface sheet 11 is configured as a two-layer structure having a first sheet 111 and a second sheet 112. In addition, in diaper 1B, the first sheet 111 functions as a printing sheet, so the intermediate sheet 55 in diaper 1 can be omitted.

[0073] The first sheet 111 is a wide sheet provided over the entire surface of the surface sheet 11 as viewed from the thickness direction Z. The second sheet 112 has a smaller width in the lateral direction X than the first sheet 111 and is positioned so as to overlap with the central part of the first sheet 111 in the lateral direction X on the skin side Z1 than the first sheet 111. As an example, the second sheet 112 has a constant width w2 in the lateral direction X and has a rectangular shape extending from the dorsal edge 2R to the ventral edge 2F. The sheet materials constituting the first sheet 111 and the second sheet 112 may be the same or different. However, from the viewpoint of improving the liquid draw-in performance to the absorbent core 31 (non-skin side Z2), it is preferable that the density of the first sheet 111 positioned on the non-skin side Z2 than the second sheet 112 be higher than the density of the second sheet 112.

[0074] In diaper 1B, the guide mark 60 is printed on the first sheet 111. In the example of Figure 5(A), the guide mark 60 is printed on the skin-facing side Z1 surface 111a of the first sheet 111, but it may also be printed on the non-skin-facing side Z2 surface 111b of the first sheet 111. The width w1 in the horizontal direction X of the guide mark 60 is smaller than the width w2 in the horizontal direction X of the second sheet 112, so that the entire guide mark 60 is covered by the second sheet 112. Note that the width w1 may be the same as the width w2.

[0075] Figure 5(B) shows a diaper 1C according to the third modified example. Diaper 1C differs from diaper 1B in that the guide mark 60 is printed on the non-skin side Z2 surface 112a of the second sheet 112.

[0076] According to diapers 1B and 1C, when the surface sheet 11 has a two-layer structure, by interposing at least one sheet (second sheet 112) between the wearer's skin and the guide mark 60 (ink), it is possible to suppress the adhesion of ink to the wearer's skin.

[0077] Furthermore, in diapers 1B and 1C, at least one end in the vertical Y direction (in this example, both the dorsal and ventral sides) of the first sheet 111 or the second sheet 112, which is a printed sheet on which the guide mark 60 is printed, coincides with the end in the vertical Y direction of the absorbent body 2 (the dorsal edge 2R and the ventral edge 2F). With the above configuration, by aligning the ends in the vertical Y direction of the printed sheet and the absorbent body 2, the occurrence of curling up of the printed sheet at the said end can be effectively suppressed. Note that the same effect as above can also be obtained by aligning the dorsal or ventral end of the intermediate sheet 55 (the printed sheet on which the guide mark 60 is printed) of diaper 1 with the end in the vertical Y direction of the absorbent body 2.

[0078] In this disclosure, an example of a guide mark is described as a mark that guides the wearer's buttocks to be placed. However, the shape of the guide mark is not limited to the above embodiment (the inverted M-shaped guide mark 60 that resembles the buttocks). Furthermore, the guide mark may also guide the wearer to place parts of their body other than their buttocks. For example, the guide mark may be a mark that guides the wearer to place their groin or urinary opening. The shape and position of the guide mark may be appropriately changed depending on the location that the guide mark is guiding. In addition, the diaper may be provided with multiple guide marks (for example, the guide mark 60 for the buttocks and the guide mark for the groin). In that case, it is sufficient that the configuration described in the above embodiment is satisfied in the printed sheet corresponding to at least one of the guide marks.

[0079] 1, 1A, 1B, 1C... Diaper, 2... Absorbent main body, 11... Surface sheet, 20... Back sheet, 30... Absorbent core, 31... Absorbent core, 32... Core wrap, 55, 55A... Intermediate sheet, 60... Guide mark, 90... Fastening tab, 111... First sheet, 112... Second sheet, CL... Transverse center line (center line), X... Horizontal direction, Y... Vertical direction, Z... Thickness direction, Z1... Skin side, Z2... Non-skin side.

Claims

1. A diaper extending in a longitudinal direction connecting the ventral side to the dorsal side of the wearer, and in a transverse direction perpendicular to the longitudinal direction, comprising: an absorbent body including a backing sheet disposed on the non-skin side opposite to the skin side of the wearer; an absorbent core disposed on the skin side of the backing sheet; and a printed sheet disposed on the skin side of the absorbent core, on which guide marks are printed for guiding the position where a part of the wearer's body should be placed; and a pair of fastening tabs extending outward in the transverse direction from the absorbent body, wherein the longitudinal distance between at least one end of the printed sheet in the longitudinal direction and the guide marks is 1 / 2 or more of the longitudinal length of the guide marks, and between the printed sheet and an adjacent sheet adjacent to the printed sheet on at least one side of the skin side and the non-skin side, the density of the printed sheet and the adjacent sheet located on the skin side is lower than the density of the printed sheet and the adjacent sheet located on the non-skin side.

2. The diaper according to claim 1, wherein the vertical distance between at least one end of the printed sheet and the guide mark in the vertical direction is greater than or equal to the vertical length of the guide mark.

3. The diaper according to claim 1, wherein the guide mark is located on the back side of a center line that passes through the center of the absorbent body in the vertical direction and is parallel to the center line in the horizontal direction, and the printed sheet is arranged to cross the center line in the vertical direction.

4. The diaper according to claim 1, wherein at least one of the vertical ends of the printed sheet coincides with the vertical end of the absorbent body.

5. The diaper according to claim 1, further comprising a surface sheet placed on the skin side of the wearer, wherein the printed sheet is an intermediate sheet placed between the surface sheet and the absorbent material.

6. The diaper according to claim 5, wherein at least one of the longitudinal ends of the printed sheet coincides with the longitudinal end of the absorbent material.

7. The diaper according to claim 5, wherein the density of the printed sheet is higher than the density of the surface sheet.

8. The diaper according to any one of claims 5 to 7, wherein the density of the printed sheet is lower than the density of the core wrap disposed on the skin-facing side of the absorbent core in the absorbent body.

9. The diaper according to claim 7, wherein the density of the printed sheet is higher than the density of the core wrap disposed on the skin-facing side of the absorbent core in the absorbent body.

10. The diaper according to claim 1, wherein the printed sheet is a core wrap disposed on the skin-facing side of the absorbent core in the absorbent body.

11. The diaper according to claim 1, wherein the guide mark is positioned to overlap with the flat portion of the absorbent core on the skin-facing side.

12. The diaper according to any one of claims 1 to 4, further comprising a surface sheet disposed on the skin side of the wearer, wherein the surface sheet comprises a first sheet and a second sheet having a smaller lateral width than the first sheet and being disposed on the skin side of the first sheet so as to overlap with the lateral central portion of the first sheet, and the guide mark is printed on the non-skin side of the second sheet or on the first sheet and is covered by the second sheet in a thickness direction perpendicular to the vertical and lateral directions.

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