Diaper

Abstract

A diaper according to one embodiment of the present invention is provided with: an absorbent main body comprising a surface sheet disposed on the skin surface side of a wearer, a back sheet disposed on the non-skin surface side on the opposite side from the skin surface side, and an absorbent core disposed between the surface sheet and the back sheet; and a pair of fastening pieces extending from the absorbent body to the outside in the lateral direction. A guide mark for guiding a position at which the buttocks of the wearer should be arranged is formed on the absorbent body so as to be visible from the skin surface side, and the absorbent core is at least partially narrowed inward in the lateral direction at a position closer to the belly side than the guide mark.

Description

Technical Field

[0001] The present disclosure relates to a diaper. Background Art

[0002] A typical belt-type diaper comprises: an absorbent body including a surface sheet, a back sheet, and an absorbent core disposed between the surface sheet and the back sheet; and a pair of fastening sheets extending outward from the absorbent body. When installing such a diaper, the wearer lies on his back on the unfolded diaper, passes the diaper through the wearer's crotch and pulls it up to the ventral side, and the pair of fastening sheets are locked to the locked portion disposed on the ventral side of the absorbent body.

[0003] If the position of the wearer lying down is wrong when the diaper is attached to the wearer, the positions of the two ends of the diaper in the longitudinal direction are not aligned in the vertical direction of the body, so the pair of fastening pieces cannot be locked to the locked parts in the correct position. If the position of the diaper is offset in the longitudinal direction, it is easy to form gaps around the wearer's legs and waist, which may cause urine leakage. In order to solve this problem, the following patent document 1 discloses a diaper with a mark on the surface sheet to guide the wearer's hip position.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2014-230716 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] In the above-mentioned diaper, when the diaper is passed through the crotch of the wearer and pulled up to the abdomen, the absorbent core of the diaper may get caught in the wearer's legs and the diaper may not be pulled up to the wearer's abdomen sufficiently. If the diaper is not pulled up sufficiently, even if the wearer lies in the correct position, there is a possibility that the position of the diaper may be displaced in the longitudinal direction.

[0009] Then, an object of the present disclosure is to suppress the deviation of the diaper.

[0010] Solutions for solving problems

[0011] In one embodiment, a diaper is provided that extends in a longitudinal direction connecting the wearer's ventral side to the back side and in a lateral direction perpendicular to the longitudinal direction. The diaper comprises: an absorbent body, which includes a surface sheet arranged on the wearer's skin side, a back sheet arranged on the non-skin side opposite to the skin side, and an absorbent core arranged between the surface sheet and the back sheet; and a pair of fastening sheets extending outward in the lateral direction from the absorbent body. A guide mark for guiding the position where the wearer's buttocks should be arranged is formed on the absorbent body in a manner that can be visually recognized from the skin side, and the absorbent core is at least partially narrowed inward in the lateral direction at a position closer to the ventral side than the guide mark.

[0012] In the diaper of this embodiment, since the absorbent core is at least partially narrowed at a position closer to the ventral side than the guide mark, when the diaper is passed through the crotch of the wearer and pulled up to the ventral side, the absorbent core is less likely to interfere with the wearer's legs. Therefore, the diaper can be fully pulled up to the ventral side, and as a result, the diaper can be prevented from shifting.

[0013] In one technical solution, the absorbent core may have a pair of channel portions, which are symmetrically formed with respect to a longitudinal center line passing through the center in the transverse direction of the absorbent body, and have a lower weight per unit area than other parts of the absorbent core, and at least part of the pair of channel portions is arranged at a position closer to the ventral side than the guide mark. The pair of channel portions have a lower rigidity than other parts of the absorbent core, so when the absorbent core contacts the wearer's legs, the absorbent core is easy to bend with the pair of channel portions as the starting point. Therefore, when the diaper is passed through the wearer's crotch and pulled up to the ventral side, the absorbent core is bent, so that it is not easy to interfere with the wearer's legs. As a result, the diaper can be fully pulled up to the ventral side, and the deviation of the diaper can be suppressed.

[0014] In one technical solution, the absorbent core may include a narrowed region whose width in the transverse direction is narrower than the end of the back side of the absorbent core, and the guide mark may be arranged at a position overlapping with the narrowed region when viewed from the skin surface side. In addition, the area of ​​the portion of the narrowed region closer to the ventral side than the guide mark may be larger than the area of ​​the portion of the narrowed region closer to the back side than the guide mark. In this technical solution, when the diaper is passed through the wearer's crotch and pulled up to the ventral side, the absorbent core is not likely to interfere with the wearer's legs.

[0015] In one technical solution, the absorbent body may include an indicator portion extending in the longitudinal direction and changing color by reacting with the body fluid of the wearer, and the guide mark is arranged at a position on the back side of the end of the back side of the indicator portion. By arranging the indicator portion at a position on the ventral side of the guide mark, the indicator portion is easy to contact with the urine of the wearer, so that the user can recognize urination.

[0016] In one technical solution, the surface sheet may include a central sheet covering the absorbent core and a pair of side sheets covering both sides of the central sheet in the transverse direction, the pair of side sheets including a back fixing portion fixed to the central sheet at a position closer to the back side than a transverse center line passing through the center of the absorbent body in the longitudinal direction, and the guide mark is arranged at a position closer to the ventral side than a midpoint between an end of the ventral side of the back fixing portion and the transverse center line in the longitudinal direction. By arranging the guide mark at a position closer to the ventral side than a midpoint between an end of the ventral side of the back fixing portion and the transverse center line, the wearer's buttocks can be guided to the correct position.

[0017] In one embodiment, the guide mark may have a shape imitating the shape of the buttocks. By making the guide mark have a shape imitating the shape of the buttocks, the user can be prompted to position the wearer's buttocks in accordance with the guide mark.

[0018] In one embodiment, the guide mark may include two curved portions convex toward the ventral side. By including the two curved portions convex toward the ventral side, the user can reliably recognize the position and direction in which the buttocks should be placed.

[0019] In one technical solution, the guide mark may include a connecting portion that connects one end of the two curved portions to each other, and the connecting portion may be arranged on a longitudinal center line passing through the center in the transverse direction of the absorbent body. By arranging the connecting portion on the longitudinal center line, the buttocks can be arranged to match the center in the width direction. In addition, the other ends of the two curved portions may be arranged at a position closer to the back side than the connecting portion.

[0020] In one technical solution, when the most ventrally protruding part of the two curved portions is set as the lowest point, a first angle formed by an imaginary line connecting one end of the two curved portions and the lowest point with respect to a reference line parallel to the transverse direction may be larger than a second angle formed by an imaginary line connecting the other end of the two curved portions and the lowest point with respect to the reference line. By making the first angle larger than the second angle, the guide mark can be made to imitate the shape of the buttocks.

[0021] In one technical solution, the line width of the two curved portions may be greater than 0.3% and less than 3.5% relative to the total length of the absorbent body in the longitudinal direction. If the line width of the two curved portions is too small, it is difficult for the user to identify the guide mark, and if the line width of the two curved portions is too large, it is difficult to place the buttocks in the correct position. By making the line width of the two curved portions greater than 0.3% and less than 3.5% relative to the total length of the absorbent body, the guide mark can be easily identified and the position deviation of the buttocks can be suppressed. In addition, the width of the guide mark in the lateral direction may be greater than the width of the guide mark in the longitudinal direction.

[0022] In one technical solution, the absorbent body may include a pair of upright leak-proof gathers disposed on the outer side of the absorbent core in the transverse direction, and when the pair of leak-proof gathers are in an upright state, the other ends of the two curved portions of the guide mark are exposed, and when the pair of leak-proof gathers are in a non-erect state, the other ends of the two curved portions of the guide mark are covered by the pair of leak-proof gathers. In this technical solution, the guide mark can be visually recognized when the diaper is installed, so the position where the buttocks should be placed can be appropriately guided.

[0023] In one technical solution, the pair of channel portions may extend from a position closer to the ventral side than the guide mark to a position closer to the back side than the guide mark, and the length of the portion of the pair of channel portions closer to the ventral side than the guide mark is longer than the length of the portion of the pair of channel portions closer to the back side than the guide mark. By making the length of the portion of the pair of channel portions closer to the ventral side than the guide mark longer, the absorbent core is easy to bend at the position closer to the ventral side than the guide mark, and is not easy to interfere with the wearer's legs.

[0024] In one technical solution, the width of the guide mark in the transverse direction may be greater than the distance between the pair of channel parts in the transverse direction. In this technical solution, the absorbent core is easy to bend along the wearer's buttocks and is not easy to interfere with the wearer's legs. In addition, the end of the back side of the pair of channel parts may be arranged at a position closer to the ventral side than the guide mark.

[0025] In one technical solution, the absorbent core may include an embossed portion having a concave-convex process, and the guide mark may be arranged at a position overlapping the embossed portion when viewed from the skin surface side. Since wrinkles are not easily generated in the embossed portion, the guide mark may be arranged at a position overlapping the embossed portion so that the guide mark is easily visually recognized.

[0026] In one technical solution, the guide mark may be printed on a sheet disposed between the surface sheet and the absorbent core. In addition, the sheet may be tissue paper (Japanese: ティッシュ) containing pulp. By printing the guide mark on the sheet disposed between the surface sheet and the absorbent core, the ink is not easily transferred to the buttocks of the wearer. In addition, the guide mark may be printed on the non-skin surface side of the sheet. Thus, the transfer of ink to the buttocks of the wearer can be more reliably prevented.

[0027] In one technical solution, at least one of the skin-facing side and non-skin-facing side of the sheet may be bonded to the surface sheet or the absorbent core using a hot melt adhesive. By bonding at least one surface of the sheet to the surface sheet or the absorbent core, it is possible to prevent the sheet from being ruptured due to friction with the surface sheet or the absorbent core.

[0028] In one technical solution, when the side panels are folded inwardly in the transverse direction, at least part of the guide mark is formed at a position that can be visually recognized from the skin surface side. By visually recognizing the guide mark when the side panels are folded, it is easier for the user to recognize the existence of the guide mark.

[0029] In another embodiment, a diaper is provided that extends in a longitudinal direction connecting the wearer's ventral side to the back side and in a lateral direction perpendicular to the longitudinal direction. The diaper comprises: an absorbent body, which includes a surface sheet arranged on the wearer's skin side, a back sheet arranged on the wearer's non-skin side, and an absorbent core arranged between the surface sheet and the back sheet; and a pair of fastening sheets extending outward in the lateral direction from the absorbent body. A guide mark for guiding the position where the wearer's buttocks should be arranged is formed on the absorbent body in a manner that can be visually recognized from the skin side, and the absorbent core has a pair of channel parts, which are formed symmetrically with respect to a longitudinal center line passing through the center of the absorbent body in the lateral direction, and have a lower weight per unit area than other parts of the absorbent core, and at least a part of the pair of channel parts is arranged at a position closer to the ventral side than the guide mark.

[0030] In the diaper of this embodiment, a pair of channel parts with a low weight per unit area are formed at a position closer to the ventral side than the guide mark. The rigidity of the pair of channel parts is lower than that of other parts of the absorbent core, so when the absorbent core contacts the legs of the wearer, the absorbent core is easily bent with the pair of channel parts as the starting point. Therefore, when the diaper is passed through the crotch of the wearer and pulled up to the ventral side, the absorbent core is bent and is not easy to interfere with the legs of the wearer. As a result, the diaper can be fully pulled up to the ventral side, and the deviation of the diaper can be suppressed.

[0031] In one technical solution, the absorbent core may be at least partially narrowed inward in the transverse direction at a position closer to the ventral side than the guide mark. Since the absorbent core is at least partially narrowed at a position closer to the ventral side than the guide mark, when the diaper is passed through the wearer's crotch and pulled up to the ventral side, the absorbent core is less likely to interfere with the wearer's legs. Therefore, the diaper can be fully pulled up to the ventral side, and the diaper can be prevented from shifting.

[0032] Effects of the Invention

[0033] According to the various aspects and technical configurations of the present invention, it is possible to suppress the diaper from shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a plan view of the diaper according to one embodiment viewed from the skin surface side.

[0035] Figure 2 Observe from the non-skin side Figure 1 A top view of the diaper shown.

[0036] Figure 3 It is along Figure 1 A cross-sectional view along line III-III is shown.

[0037] Figure 4 It is a diagram showing an enlarged view of the periphery of the guide mark.

[0038] Figure 5 It is a top view of the diaper of another embodiment.

[0039] Figure 6 It is a top view of a diaper according to still another embodiment.

[0040] Figure 7 It is a top view of a diaper according to still another embodiment.

[0041] Figure 8 (a)~ Figure 8 (d) is a diagram showing a modified example of the guide mark.

[0042] Fig. 9 (a)~ Fig. 9 (d) is a diagram showing a modified example of the guide mark.

[0043] Fig.10 It is a diagram showing a modified example of the guide mark. DETAILED DESCRIPTION

[0044] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals, and repeated descriptions are not repeated. The dimensional ratios of the drawings are not necessarily the same as those in the description.

[0045] Figure 1 This is a plan view of the diaper 1 according to one embodiment as viewed from the skin surface side. Figure 2 This is a plan view of the diaper 1 as viewed from the non-skin surface side. Figure 3 It is along the diaper 1 Figure 1 A schematic cross-sectional view of line III-III is shown. Figure 1 and Figure 2 1 shows the diaper 1 in the unfolded state in which the diaper is stretched to a state where wrinkles are not formed. In the following description, the positional relationship in the unfolded state is described unless otherwise specified. Figure 3 In the cross-sectional view, for the sake of convenience of explanation, the components are shown separately in the thickness direction Z, but in an actual product, the components are in contact with each other in the thickness direction Z.

[0046] Figure 1 to Figure 3The diaper 1 shown is a belt-type disposable diaper. The diaper 1 may be a diaper for children or an adult diaper. In the following description, a person wearing the diaper 1 is referred to as a "wearer", and a person who puts the diaper 1 on the wearer is referred to as a "user". Typically, the wearer is a child or a person being cared for, and the user is a parent or a caregiver.

[0047] like Figure 1 As shown, the diaper 1 extends in a transverse direction X and a longitudinal direction Y, wherein the transverse direction X is arranged along the waist direction of the wearer, and the longitudinal direction Y connects the belly side of the wearer to the back side. 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 directions perpendicular to each other. The thickness direction Z is a direction perpendicular to the transverse direction X and the longitudinal direction Y, and includes a skin surface side Z1 facing the skin surface of the wearer in the wearing state and a non-skin surface side Z2 facing the side opposite to the skin surface of the wearer in the wearing state. The diaper 1 is installed in a manner that covers the abdomen, crotch and back of the wearer.

[0048] The diaper 1 includes an absorbent body 2 and a pair of fastening sheets 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. The ventral edge 2F is arranged along the waist direction of the wearer on the ventral side when worn, and the dorsal edge 2R is arranged along the waist direction of the wearer on the dorsal side when worn. The distance between the ventral edge 2F and the dorsal edge 2R in the longitudinal direction Y is the total length (maximum length) L1 of the absorbent body 2. In the following description, the ventral edge 2F in the longitudinal direction Y is referred to as the ventral side, and the dorsal edge 2R in the longitudinal direction Y is referred to as the dorsal side.

[0049] The absorbent body 2 has a dorsal region 51 located on the dorsal side, an abdominal region 52 located on the abdominal side, and a middle region 53 located between the dorsal region 51 and the abdominal region 52. The width of the middle region 53 in the transverse direction X is smaller than the width of the dorsal region 51 in the transverse direction X and the width of the abdominal region 52 in the transverse direction X.

[0050] A pair of flaps 15 are formed in the back region 51 of the absorbent body 2 so as to protrude outward from the absorbent body 2 in the transverse direction X. The width of the pair of flaps 15 in the transverse direction X corresponds to the maximum width of the absorbent body 2 .

[0051] The pair of fastening pieces 90 are respectively provided on the pair of wing portions 15. The pair of fastening pieces 90 extend outward from the side edge 2S of the absorbent body 2 in the transverse direction X. The pair of fastening pieces 90 respectively include a base sheet 91 joined to the wing portion 15 and a joining portion 92 provided on the base sheet 91. The joining portion 92 is arranged on the skin surface side Z1 of the base sheet 91. The joining portion 92 is, for example, a hook and loop fastener, and is configured to be able to join with the target portion 45 formed on the non-skin surface side Z2 of the absorbent body 2.

[0052] like Figure 2 As shown, the target portion 45 is provided on the non-skin surface side Z2 of the ventral region 52 of the absorbent body 2. The target portion 45 has a strip shape extending in the transverse direction X. The target portion 45 is arranged at a position closer to the ventral side than the pair of fastening sheets 90, and is engaged with the pair of fastening sheets 90. In addition, the absorbent body 2 may be configured so that the target portion 45 is not provided, and the joining portion 92 of the pair of fastening sheets 90 is directly joined to the back sheet 20 of the absorbent body 2 described later.

[0053] like Figure 1 to Figure 3 As shown, the absorbent body 2 includes a surface sheet 10, a back sheet 20, and an absorbent core 30. The surface sheet 10 constitutes the surface of the absorbent body 2 that contacts the wearer and is arranged on the skin surface side Z1. The surface sheet 10 includes: a central sheet 11, which is arranged in the center in the transverse direction X and covers the absorbent core 30; and a pair of side sheets 12, which cover the two side portions of the central sheet 11 in the transverse direction X. The central sheet 11 is composed of, for example, a liquid-permeable nonwoven fabric that allows the wearer's urine to pass through to the absorbent core 30 side, and the side sheets 12 are composed of, for example, a liquid-impermeable nonwoven fabric.

[0054] like Figure 3 As shown, the inner side portions of the pair of side sheets 12 in the transverse direction X are folded back toward the non-skin surface side Z2. A pair of elastic members 13 in a state of being stretched in the longitudinal direction Y are arranged between the folded back pair of side sheets 12. The pair of side sheets 12 and the pair of elastic members 13 constitute a pair of leakage-proof gathers 80. The pair of leakage-proof gathers 80 are upright leakage-proof gathers, and are arranged at a position closer to the skin surface side Z1 than the absorbent core 30.

[0055] like Figure 1 As shown, a pair of anti-leakage gathers 80 are arranged on the outer side of the absorbent core 30 in the transverse direction X to suppress the leakage of urine excreted into the absorbent core 30 in the transverse direction X. The pair of anti-leakage gathers 80 respectively include an elastic member 13 extending in the longitudinal direction Y, a rising portion 81 rising due to the contraction of the elastic member 13, a transverse fixing portion 82 serving as a rising fulcrum of the rising portion 81 in the transverse direction X, and a longitudinal fixing portion 83 serving as a rising fulcrum of the rising portion 81 in the longitudinal direction Y.

[0056] The elastic member 13 extends in the longitudinal direction Y along the inner edge of the side panel 12 in the transverse direction X. The elastic member 13 is made of a stretchable material such as rubber or spandex that can shrink in the longitudinal direction. The elastic members 13 of the pair of leak-proof gathers 80 are arranged to be separated from each other across a longitudinal center line CW passing through the center of the absorbent body 2 in the transverse direction X, and are fixed to the side panel 12 in a state of being stretched in the longitudinal direction Y. The back end of the elastic member 13 is arranged in the back region 51, and the ventral end of the elastic member 13 is arranged in the ventral region 52.

[0057] The transverse fixing portion 82 is formed in the substantially entire region in the longitudinal direction Y of the absorbent body 2 at a position outside the standing portion 81 in the transverse direction X in the side sheet 12. That is, the transverse fixing portion 82 is arranged outside the absorbent core 30 in the transverse direction X. The transverse fixing portion 82 is a part of the side sheet 12 and is fixed to the central sheet 11. The transverse fixing portion 82 serves as a standing fulcrum in the transverse direction X of the standing portion 81.

[0058] The longitudinal fixing portion 83 is formed on the inner side of the transverse fixing portion 82 in the transverse direction X. The longitudinal fixing portion 83 includes a dorsal fixing portion 84 arranged in the dorsal region 51 and a ventral fixing portion 85 arranged in the ventral region 52. The dorsal fixing portion 84 and the ventral fixing portion 85 are part of the side sheet 12 and are fixed to the central sheet 11. The dorsal fixing portion 84 and the ventral fixing portion 85 serve as the standing fulcrums on the dorsal side and the ventral side of the standing portion 81, respectively.

[0059] The rising portion 81 is formed between the back fixing portion 84 and the ventral fixing portion 85. That is, the rising portion 81 is arranged at a position that is closer to the inside than the transverse fixing portion 82 in the transverse direction X and is closer to the inside than the longitudinal fixing portion 83 in the longitudinal direction Y. The rising portion 81 is a portion of the side sheet 12 that is not fixed to the central sheet 11. The elastic member 13 is connected to the rising portion 81 in a state of being stretched in the longitudinal direction Y. The elastic member 13 contracts in the longitudinal direction Y, so that the absorbent body 2 is deformed in the closing direction, and the rising portion 81 stands up with the transverse fixing portion 82 as the starting point. Urine leakage is prevented by the rising portion 81 standing up at a position where the absorbent core 30 is sandwiched from the transverse direction X in this way.

[0060] The back sheet 20 constitutes the surface of the absorbent body 2 that is located on the outside when worn, and is arranged on the non-skin surface side Z2. The back sheet 20 includes a liquid-impermeable back film 21 and a back nonwoven fabric 22 that is located closer to the non-skin surface side Z2 than the back film 21. It is also possible that the width of the back film 21 in the transverse direction X is formed to be shorter than the width of the back nonwoven fabric 22 in the transverse direction X, and the back nonwoven fabric 22 extends to both sides in the transverse direction X than the back film 21. The back nonwoven fabric 22 constitutes the outermost layer of the diaper 1.

[0061] The absorbent core 30 is disposed between the surface sheet 10 and the back sheet 20. The absorbent core 30 contains, for example, water-absorbent pulp fibers and a polymer absorbent (SAP) to absorb urine from the wearer. Figure 3 As shown, the upper surface and the lower surface of the absorbent core 30 are covered with the core wrap 38. The absorbent core 30 is arranged substantially at the center in the transverse direction X of the absorbent body 2.

[0062] The absorbent core 30 has a dorsal edge 30R and a ventral edge 30F. The dorsal edge 30R of the absorbent core 30 has a width W1 in the transverse direction X. The width W1 is the maximum width of the absorbent core 30. The width W1 of the dorsal edge 30R is larger than the distance d between the pair of leak-proof pleats 80 in the non-erect state. The ventral edge 30F of the absorbent core 30 has, for example, the same width as the dorsal edge 30R. A narrowed region 43 where the width of the absorbent core 30 is narrowed is formed between the ventral edge 30F and the dorsal edge 30R. The narrowed region 43 is, for example, a region where the width of the absorbent core 30 in the transverse direction X is narrowed by 10% or more relative to the width W1 of the ventral edge 30F and the width W1 of the dorsal edge 30R.

[0063] The narrowed region 43 includes a narrow portion 36 whose width becomes narrowest in the transverse direction X. The width W2 of the narrow portion 36 is smaller than the width W1 of the end edge 30R on the back side of the absorbent core 30. The width of the narrowed region 43 continuously narrows from the end edge 30R on the back side toward the narrow portion 36. Similarly, the width of the narrowed region 43 continuously narrows from the end edge 30F on the ventral side toward the narrow portion 36.

[0064] The narrow portion 36 may be arranged at a position closer to the ventral side than the transverse center line CL1 passing through the center of the absorbent body 2 in the longitudinal direction Y and closer to the dorsal side than the middle line CL2 between the transverse center line CL1 and the ventral edge 2F. The transverse center line CL1 is a portion that forms a fold when the diaper 1 is folded in half in the longitudinal direction Y. When the diaper 1 is worn by a wearer, the narrow portion 36 is arranged near the crotch of the wearer.

[0065] It can also be, Figure 1 As shown, a pair of channel portions 70 are formed in the absorbent core 30. The pair of channel portions 70 are arranged symmetrically with respect to the longitudinal center line CW of the absorbent body 2. The unit weight of the pair of channel portions 70 is set lower than the unit weight of the other parts of the absorbent core 30. Therefore, the density of the pulp fiber and the super absorbent polymer present in the pair of channel portions 70 is lower than the density of the pulp fiber and the super absorbent polymer present in the other parts of the absorbent core 30. In one embodiment, the pair of channel portions 70 may also be slits with a unit weight of zero.

[0066] The pair of channel portions 70 extend linearly along the longitudinal direction Y. In addition, the pair of channel portions 70 may extend in a curved manner along the longitudinal direction Y. Figure 1 In the diaper 1 shown, the pair of channel portions 70 are arranged on the ventral side of the guide mark 60 described later. That is, the pair of channel portions 70 are formed at positions that do not overlap with the guide mark 60 when viewed in the thickness direction Z.

[0067] The pair of channel portions 70 has a lower basis weight than other portions of the absorbent core 30, and thus has lower rigidity than other portions of the absorbent core 30. Therefore, when the absorbent core 30 comes into contact with the wearer's legs when the wearer wears the diaper 1, the absorbent core 30 is easily bent starting from the pair of channel portions 70.

[0068] Moreover, you may form the embossed part which has a concavo-convex shape by embossing on the surface of the absorbent core 30. The embossed part may be formed in the whole area of ​​the absorbent core 30, and may be formed only in a part of the absorbent core 30.

[0069] The absorbent body 2 is provided with a guide mark 60 for guiding the position of the wearer's buttocks. The guide mark 60 is printed on the absorbent body 2 so as to be visible from the skin surface side Z1. Figure 1 As shown, in order to allow the user to recognize the position where the wearer's buttocks should be placed, the guide mark 60 has a substantially letter W shape that imitates the buttocks.

[0070] like Figure 3 As shown, the guide mark 60 is printed on the sheet 55 disposed between the surface sheet 10 and the absorbent core 30. The sheet 55 is, for example, a tissue paper containing pulp. The surface of the skin surface side Z1 of the sheet 55 is bonded to the central sheet 11 of the surface sheet 10, and the surface of the non-skin surface side Z2 of the sheet 55 is bonded to the core wrap 38 of the absorbent core 30. The bonding of the sheet 55 is, for example, using a hot melt adhesive. In addition, only one of the surface of the skin surface side Z1 and the surface of the non-skin surface side Z2 of the sheet 55 may be bonded to the surface sheet 10 or the absorbent core 30.

[0071] The guide mark 60 may also be printed on the non-skin surface Z2 (absorbent core 30 side) of the sheet 55. The guide mark 60 printed on the non-skin surface Z2 of the sheet 55 can be visually recognized from the skin surface Z1 through the central sheet 11 and the sheet 55. In order to prevent mistaking for blood or excrement, the guide mark 60 may also be printed with ink of a color other than red and yellow. For example, the guide mark 60 is printed in blue or green. More specifically, the guide mark 60 is printed in a color included in the range of 5GY to 10RP of the Munsell color circle, for example.

[0072] like Figure 1As shown, the guide mark 60 is formed at a position on the dorsal side than the narrow portion 36. In other words, the absorbent core 30 is narrowed inward in the transverse direction X at a position on the ventral side than the guide mark 60. In more detail, the guide mark 60 is arranged at a position on the dorsal side than the transverse center line CL1 of the absorbent body 2, and is arranged at a position on the ventral side than the middle line CL3 between the transverse center line CL1 and the ventral end 84F of the dorsal fixing portion 84. In addition, when observed from the skin surface side Z1, the guide mark 60 overlaps with the narrowed region 43 of the absorbent core 30. Alternatively, the area of ​​the portion on the ventral side of the narrowed region 43 that is closer to the guide mark 60 is larger than the area of ​​the portion on the dorsal side of the narrowed region 43 that is closer to the guide mark 60.

[0073] Furthermore, the guide mark 60 may be formed at a position overlapping the embossed portion of the absorbent core 30 when viewed from the skin surface side Z1. Since wrinkles are less likely to occur in the topsheet 10 disposed on the embossed portion, the guide mark 60 is disposed at a position overlapping the embossed portion, thereby improving the visibility of the guide mark 60.

[0074] Figure 4 2 is a diagram showing an enlarged view of the periphery of the guide mark 60. Figure 4 As shown, the guide mark 60 includes two curved portions 61 that are smoothly curved in a manner that is convex toward the ventral side. The two curved portions 61 each have one end 62 and the other end 63, and extend in a substantially semicircular arc shape between the one end 62 and the other end 63. One ends 62 of the two curved portions 61 are connected to each other at a connecting portion 65. The connecting portion 65 is arranged on the longitudinal center line CW of the absorbent body 2. The other ends 63 of the two curved portions 61 are located at a position that is closer to the outside of the connecting portion 65 in the transverse direction X. In addition, the other ends 63 of the two curved portions 61 are arranged at a position that is closer to the back side than the connecting portion 65 in the longitudinal direction Y. By printing the guide mark 60 having the above-mentioned shape on the absorbent body 2, the user of the diaper 1 associates the shape of the guide mark 60 with the shape of the buttocks, and recognizes that the wearer's buttocks should be configured to match the guide mark 60.

[0075] In addition, the guide mark 60 has a width W3 in the transverse direction X and a width L2 in the longitudinal direction Y. The width W3 of the guide mark 60 in the transverse direction X corresponds to the distance in the transverse direction X between the other ends 63 of the two curved portions 61. When the most ventrally protruding portion of the two curved portions 61 is set as the lowest point 64, the width L2 of the guide mark 60 in the longitudinal direction Y corresponds to the distance in the longitudinal direction Y between the other ends 63 of the two curved portions 61 and the lowest point 64. The width W3 of the guide mark 60 in the transverse direction X is larger than the width L2 of the guide mark 60 in the longitudinal direction Y. Therefore, the guide mark 60 has a horizontally long shape that is long in the transverse direction X.

[0076] The width W3 of the guide mark 60 in the transverse direction X is larger than the distance W4 between the pair of channel portions 70 in the transverse direction X. In addition, the width W3 of the guide mark 60 in the transverse direction X is smaller than the distance d between the pair of anti-leakage gathers 80 in the non-erect state. Figure 1 As shown in the figure, when the pair of anti-leakage pleats 80 is in the non-erect state, the connecting portion 65 of the guide mark 60 is exposed on the skin surface side Z1, and the other ends 63 of the two curved portions 61 of the guide mark 60 are covered by the pair of anti-leakage pleats 80. That is, when the pair of anti-leakage pleats 80 is in the non-erect state, the guide mark 60 can be partially visually recognized. On the other hand, when the pair of anti-leakage pleats 80 is in the erect state, the entire guide mark 60 including the other ends 63 of the two curved portions 61 of the guide mark 60 is exposed on the skin surface side Z1.

[0077] Alternatively, it can be, Figure 4 As shown in FIG. 1 , a first angle θ1 formed by an imaginary line 67 connecting one end 62 of the two curved portions 61 and the lowest point 64 with respect to a reference line 66 parallel to the transverse direction X is larger than a second angle θ2 formed by an imaginary line 68 connecting the other end 63 of the two curved portions 61 and the lowest point 64 with respect to the reference line 66. By making the first angle θ1 larger than the second angle, the guide mark 60 can be made into a shape that imitates the buttocks. In particular, by increasing the first angle θ1, the angle formed by the two curved portions 61 at the connecting portion 65 becomes smaller, and the connecting portion 65 becomes a shape that protrudes sharply toward the back side. By setting it to such a shape, it is possible to guide the wearer's buttocks seam to be arranged in alignment with the connecting portion 65.

[0078] In addition, the two curved portions 61 have a substantially constant line width t from one end 62 to the other end 63. The line width t of the two curved portions 61 may be 0.3% or more and 3.5% or less relative to the total length L of the absorbent body 2 in the longitudinal direction Y. By setting the line width t to 0.3% or more and 3.5% or less relative to the total length L of the absorbent body 2, the guide mark 60 can be easily recognized by the user, and the position of the buttocks can be suppressed from being shifted.

[0079] In addition, a plurality of openings may be formed in the central sheet 11 of the top sheet 10. By forming a plurality of openings in the central sheet 11, the guide mark 60 can be visually recognized from the skin surface side Z1 through the opening, and the guide mark 60 can be easily recognized. In addition, the distance between the openings of the top sheet 10 may be smaller than the line width t of the guide mark 60. Thus, since the plurality of openings overlap with the guide mark 60, the visual recognition of the guide mark 60 can be improved.

[0080] In one embodiment, it may also be, Figure 2As shown, the absorbent body 2 has an indicator portion 72 that changes color by contact with water. The indicator portion 72 is provided on the back sheet 20 in a manner that can be visually recognized from the non-skin surface side Z2 of the absorbent body 2, and changes color by reacting with the body fluid absorbed by the absorbent core 30. The indicator portion 72 changes color, so that the user can understand the degree of wetness of the absorbent core 30.

[0081] like Figure 2 As shown, the indicator portion 72 includes a central indicator portion 73 disposed at the center of the absorbent body 2 in the transverse direction X and a pair of side indicator portions 74 disposed outside the central indicator portion 73 in the transverse direction X. The central indicator portion 73 and the pair of side indicator portions 74 extend linearly along the longitudinal direction Y. In addition, the central indicator portion 73 and the pair of side indicator portions 74 may extend in a wavy or curved manner along the longitudinal direction Y.

[0082] The end of the ventral side of the central indicator portion 73 is arranged at a position closer to the ventral side than the guide mark 60. The end of the dorsal side of the central indicator portion 73 is arranged at a position closer to the dorsal side than the guide mark 60. That is, the central indicator portion 73 extends in the longitudinal direction Y in a manner that vertically cuts the guide mark 60. The ends of the dorsal sides of the pair of side indicator portions 74 are arranged at a position closer to the ventral side than the guide mark 60. Therefore, the pair of side indicator portions 74 are formed at positions that do not overlap with the guide mark 60 when viewed from the thickness direction Z. Thus, when the diaper 1 is installed by arranging the wearer's buttocks to match the guide mark 60, the ends of the dorsal sides of the side indicator portions 74 can be visually identified. By visually identifying the ends of the dorsal sides of the side indicator portions 74, it is possible to confirm that the diaper 1 is properly installed.

[0083] In addition, the distance between the pair of side indicator portions 74 in the transverse direction X may be smaller than the width W3 of the guide mark 60 in the transverse direction X. Thus, the pair of side indicator portions 74 are arranged in the crotch of the wearer, so that the pair of side indicator portions 74 are easily contacted with urine during urination. Therefore, the degree of wetness of the absorbent core 30 can be easily grasped.

[0084] As described above, the guide mark 60 is arranged at a position on the dorsal side relative to the end portions on the dorsal side of the pair of side indicator portions 74. In addition, the end portion on the dorsal side of the central indicator portion 73 may be arranged at a position on the ventral side relative to the guide mark 60, and the central indicator portion 73 and the pair of side indicator portions 74 may be formed as a whole at a position on the ventral side relative to the guide mark 60.

[0085] The indicator portion 72 may also include a message indicator portion 75, which changes color when in contact with water to display message information such as text or illustrations. The message indicator portion 75 is disposed on the ventral side of the central indicator portion 73. A slight gap may be formed between the ventral end of the central indicator portion 73 and the message indicator portion 75. Alternatively, as shown in FIG. Figure 2As shown, the distance D1 in the longitudinal direction Y from the transverse center line CL1 to the end of the ventral side of the message indicator 75 is longer than the distance D2 in the longitudinal direction Y from the transverse center line CL1 to the lowest point 64 of the guide mark 60. In addition, the distance D1 in the longitudinal direction Y from the transverse center line CL1 to the end of the ventral side of the message indicator 75 may be longer than the distance D3 in the longitudinal direction Y from the transverse center line CL1 to the other end 63 of the guide mark 60. The portion closer to the ventral side than the lowest point 64 of the guide mark 60 is deformed when the wearer closes his legs. By increasing the distance D1 in the longitudinal direction Y from the transverse center line CL1 to the end of the ventral side of the message indicator 75, it is possible to suppress the situation in which the message indicator 75 is deformed when the diaper 1 is changed, thereby reducing the visual recognition of the message indicator 75.

[0086] It can also be, Figure 1 As shown, the diaper 1 also includes an elastic member 40 that can be stretched in the length direction. The elastic member 40 is arranged at a position that is closer to the outside in the transverse direction X than the elastic member 13. The back end of the elastic member 40 is arranged in the back area 51, and the ventral end of the elastic member 40 is arranged in the ventral area 52. The elastic member 40 is composed of a stretchable material such as rubber or spandex that can be stretched in the length direction, and is arranged along the side edge 2S of the absorbent body 2 between the surface sheet 10 and the back sheet 20 of the absorbent body 2. When the diaper 1 is worn, the elastic member 40 shrinks in the longitudinal direction Y, so that the side edge 2S of the absorbent body 2 fits the leg circumference of the wearer. That is, the elastic member 40 forms leg gathers that stretch along the leg circumference of the wearer. In addition, the diaper 1 may also have a plurality of elastic members 40. As Figure 1 As shown, the plurality of elastic members 40 are arranged along the transverse direction X on the outer side of the elastic member 13 and extend along the longitudinal direction Y in parallel with each other.

[0087] In addition, it can also be, Figure 2 As shown, in the guide mark 60, the imaginary line 60L is arranged at a position intersecting with the elastic member 40, and the imaginary line 60L connects the lowest point 64 of the guide mark 60 and the end edge of the ventral side of the fastening piece 90 (more specifically, the position where the side edges of the pair of wing portions 15 and the end edges of the ventral side of the pair of fastening pieces 90 intersect when viewed from the thickness direction Z). In this case, when the diaper 1 is worn, the force pulling the fastening piece 90 is transmitted to the elastic member 40, and the fit of the leg circumference is improved.

[0088] Furthermore, when the diaper 1 includes a plurality of elastic members 40, the middle point 60C between the lowest point 64 of the guide mark 60 and the end edge of the ventral side of the fastening sheet 90 may be arranged at a position that is more inward in the transverse direction X than the elastic member 40 arranged on the outermost side among the plurality of elastic members 40 (hereinafter referred to as the "outer elastic member"). The middle point 60C may be arranged at a position that is more inward in the transverse direction X than the middle line between the elastic member 40 arranged on the innermost side among the plurality of elastic members 40 (hereinafter referred to as the "inner elastic member") and the outer elastic member. Furthermore, the middle point 60C may be arranged at a position that is more inward in the transverse direction X than the middle line between the inner elastic member and the outer elastic member and more outward than the inner elastic member.

[0089] By arranging the guide mark 60 at the above-mentioned position, the tension applied to the fastening sheet 90 is transmitted to the elastic member 40 when the diaper 1 is worn, thereby improving the fit of the leg circumference. In particular, by making the contraction force of the outer elastic member lower than the contraction force of the inner elastic member, the tension applied to the fastening sheet 90 is easy to act on the outer elastic member. In addition, a lower contraction force means a lower elongation ratio. The elongation ratio of the elastic member 40 refers to: for a test piece including an elastic member 40 cut together with the absorbent body 2, the ratio S1 / S2 of the length S1 of the elastic member 40 when the absorbent body 2 is stretched until the pleats due to the contraction of the elastic member 40 disappear to the natural length S2 of the elastic member 40 removed from the test piece.

[0090] In one embodiment, the pair of wing portions 15 may be stretchable wings that are independent from the absorbent body 2 . Figure 6 This is a top view of a diaper 1B having a pair of stretch wings 16 observed from the skin surface side Z1. The absorbent body 2 of the diaper 1B has a substantially rectangular planar shape. The pair of stretch wings 16 each have a substantially trapezoidal planar shape and are joined to the absorbent body 2 by means of a joining portion 17. The joining portion 17 is a portion where the stretch wings 16 and the laminated portion of the absorbent body 2 are joined by well-known means such as hot melt adhesive (HMA), ultrasonic processing, and embossing. In addition, when the joining portion 17 is formed by ultrasonic processing or embossing processing that deforms the fibers to integrate the stretch wings 16 and the absorbent body 2, the rigidity of the joining portion 17 is increased, and the distortion of the diaper 1B when worn can be suppressed.

[0091] In addition, if Figure 6As shown in the figure, when the straight line connecting the end of the ventral side of the joint 17 and the lowest point 64 of the guide mark 60 is set as the imaginary line 18, when viewed from the skin surface side Z1, the imaginary line 18 partially overlaps with the stretch wing 16. More specifically, when viewed from the skin surface side Z1, the imaginary line 18 intersects with the boundary line between the absorbent body 2 and the pair of stretch wing 16. In addition, the imaginary line 18 may overlap with the fastening sheet 90 when viewed from the skin surface side Z1.

[0092] By arranging the joint 17 and the guide mark 60 in the above-mentioned positional relationship, when the diaper 1 is worn, a pulling force is applied starting from the position of the wearer's buttocks, thereby preventing the stretch flap from loosening and enabling the fastening piece 90 to be fixed. Therefore, the diaper 1 can fit the wearer.

[0093] Furthermore, when viewed from the skin surface side Z1, the imaginary line 18 may intersect the elastic member 40. In this case, the tension acting on the fastening sheet 90 is easily transmitted to the elastic member 40, and the fit of the leg circumference is improved.

[0094] When wearing the above-mentioned diaper 1, the user arranges the wearer's buttocks in accordance with the guide mark 60. More specifically, the wearer's buttocks are arranged in accordance with the two curved portions 61 in such a manner that the buttock seam is located above the connecting portion 65 when the wearer lies on his back. Next, the ventral region 52 of the absorbent body 2 is passed through the wearer's crotch and pulled up toward the wearer's ventral side. Then, in a state where the ventral region 52 of the absorbent body 2 touches the wearer's abdomen, a pair of fastening pieces 90 attached to the back region 51 of the absorbent body 2 are pulled toward the wearer's ventral side in the waist direction, and the pair of fastening pieces 90 are fixed to the outer surface of the target portion 45. Thus, the diaper 1 is installed in such a manner as to cover the wearer's abdomen, back, and crotch. In the above-mentioned diaper 1, since a narrow portion 36 that narrows inward in the transverse direction X is formed on the ventral side of the guide mark 60, when the ventral region 52 of the absorbent body 2 is pulled up toward the wearer's ventral side, the absorbent core 30 is less likely to interfere with the wearer's legs. Therefore, it is possible to suppress the diaper 1 from being insufficiently pulled up and shifting. Furthermore, even when the absorbent core 30 contacts the wearer's legs, the absorbent core 30 is bent starting from the pair of channel portions 70 having low rigidity, so that it is possible to more reliably suppress the diaper 1 from being insufficiently pulled up.

[0095] In addition, the belt-type diaper 1 is usually circulated in a state in which it is stored in a package in a folded state. For example, the diaper 1 is stored in a package in a state in which it is folded in half in the longitudinal direction Y in such a way that the ventral area 52 and the dorsal area 51 of the absorbent body overlap after the pair of side panels 12 are folded inwardly in the transverse direction X along the transverse fixing portion 82. When using the diaper 1, the user takes the diaper 1 folded as described above out of the package and unfolds the absorbent body 2 in the longitudinal direction Y, and then unfolds the pair of side panels 12 in the transverse direction X. Here, in the diaper 1, when the pair of side panels 12 are folded inwardly in the transverse direction X, at least a part of the guide mark 60 is formed in a position that can be visually recognized from the skin surface side Z1. By being able to visually recognize the guide mark 60 in the state in which the pair of side panels 12 are folded, the user can reliably recognize the existence of the guide mark 60.

[0096] also, Figure 1 The diaper 1 shown in the figure includes the absorbent core 30 having the pair of channel portions 70, but the absorbent core 30 does not necessarily need to be formed with the pair of channel portions 70. Even when the pair of channel portions 70 are not formed, if the narrow portion 36 whose width in the transverse direction X is locally narrowed is formed in the absorbent core 30 on the ventral side of the guide mark 60, the absorbent core 30 is less likely to interfere with the wearer's legs, and thus the diaper 1 can be prevented from shifting.

[0097] Furthermore, if a pair of channel portions 70 are formed in the absorbent core 30, the absorbent core 30 does not need to be narrowed at a position closer to the ventral side than the guide mark 60. Figure 5 A diaper 1A according to another embodiment will be described. Figure 1 The different points of the diapers are shown, and repeated descriptions are omitted.

[0098] Figure 5 The diaper 1A shown has an absorbent core 30A instead of the absorbent core 30. The absorbent core 30A differs from the absorbent core 30 in that the absorbent core 30A has a substantially constant width over the entire area in the longitudinal direction Y. A pair of channel portions 70A are formed in the absorbent core 30A. The pair of channel portions 70A are symmetrically arranged with respect to the longitudinal center line CW of the absorbent body 2. The unit area weight of the pair of channel portions 70A is set lower than the unit area weight of other parts of the absorbent core 30A. In one embodiment, the pair of channel portions 70A may also be slits with a unit area weight of zero.

[0099] The pair of channel portions 70A extend in a curved manner along the longitudinal direction Y. In addition, the pair of channel portions 70A may extend in a straight line along the longitudinal direction Y. The pair of channel portions 70 extend in a manner of longitudinally sectioning the guide mark 60. More specifically, the end portions 70R on the dorsal side of the pair of channel portions 70A are arranged at a position on the dorsal side of the guide mark 60, and the end portions 70F on the ventral side of the pair of channel portions 70A are arranged at a position on the ventral side of the guide mark 60. Therefore, a portion of the pair of channel portions 70 is formed on the ventral side of the guide mark 60.

[0100] Here, the length of the portion of the pair of channel portions 70A closer to the ventral side than the guide mark 60 is longer than the length of the portion of the pair of channel portions 70A closer to the back side than the guide mark 60. That is, most of the pair of channel portions 70 are arranged closer to the ventral side than the guide mark 60. In the above-mentioned diaper 1A, since the pair of channel portions 70A are formed on the ventral side of the guide mark 60, when the ventral region 52 of the absorbent body 2 is pulled up toward the ventral side of the wearer, the absorbent core 30 is easily bent with the pair of channel portions 70A as the starting point. Therefore, the absorbent core 30 is less likely to interfere with the wearer's legs, and the situation where the diaper 1 is pulled up insufficiently can be suppressed.

[0101] The above describes various embodiments of diapers, but the present invention is not limited to the above embodiments, and various modifications can be made without changing the gist of the invention. That is, it should be noted that the above embodiments are for illustrative purposes and do not limit the scope of the present invention.

[0102] For example, it can also be, Figure 7 As shown, the guide mark 60 is not a solid line but a dotted line. In addition, the shape of the guide mark 60 is not limited to a shape that imitates the buttocks as long as it can guide the position where the buttocks of the wearer should be placed. Figure 8 (a)~ Figure 8 (d) Fig. 9 (a)~ Fig. 9 (d) and Fig.10 Modifications of the guide mark are shown. Modifications of the guide mark are described below.

[0103] For example, Figure 8 The guide mark 60A shown in (a) extends linearly in the transverse direction X. The length of the guide mark 60A in the transverse direction X may be longer than the distance between the pair of leakage-barrier gathers 80 . Figure 8 The guide mark 60B shown in (b) includes a plurality of quadrilateral-shaped figures arranged at intervals from each other in the lateral direction X, and is formed in a dotted line shape as a whole. Figure 8The guide mark 60C shown in (c) includes a pair of triangular shapes facing each other in the transverse direction X. The pair of triangular shapes are formed line-symmetrically with respect to the longitudinal center line CW, and one of the vertices of each shape faces the transverse direction X to indicate the position where the buttocks should be arranged. Figure 8 The guide mark 60D shown in (d) includes characters for guiding the position where the buttocks should be placed.

[0104] Fig. 9 The guide mark 60E shown in (a) is arranged on the longitudinal center line CW and includes a triangular figure with one vertex facing the back side. The one vertex indicates the position where the buttocks should be arranged. Fig. 9 The guide mark 60F shown in (b) includes a cross-shaped figure arranged on the longitudinal center line CW. The intersection position of the figure indicates the position where the wearer's buttocks should be arranged. Fig. 9 The guide mark 60G shown in (c) includes a quadrilateral figure arranged on the longitudinal center line CW and a dotted line formed along the lateral direction X so as to intersect the figure. Fig. 9 The guide mark 60H shown in (d) includes a dotted line that is arranged on the longitudinal center line CW and formed along the longitudinal direction Y.

[0105] Fig.10 The guide mark 60I shown includes a straight line extending in the transverse direction X and a straight line extending in the longitudinal direction Y. The length of the straight line extending in the transverse direction X is longer than the distance between the pair of leakage-proof gathers 80 and shorter than the entire width of the absorbent body 2 in the transverse direction X. The straight line extending in the longitudinal direction Y extends over the entire length of the absorbent body 2 in the longitudinal direction Y. The intersection position of the straight line extending in the transverse direction X and the straight line extending in the longitudinal direction Y indicates the position where the wearer's buttocks seam should be arranged.

[0106] In addition, the guide mark 60 may be an illustration of an animal or the like, or a pattern such as a heart-shaped mark or the like. The above-mentioned various embodiments can be combined within a range in which there is no contradiction.

[0107] Hereinafter, the present invention will be described with reference to the enumerated items. In addition, the present invention may include the following items in any combination even if not specifically enumerated.

[0108] 1. A diaper extending in a longitudinal direction connecting a wearer's belly side to a back side and in a transverse direction perpendicular to the longitudinal direction, wherein:

[0109] This diaper has:

[0110] An absorbent body including a top sheet disposed on the skin-facing side of the wearer, a back sheet disposed on the non-skin-facing side opposite to the skin-facing side, and an absorbent core disposed between the top sheet and the back sheet; and

[0111] a pair of fastening pieces extending from the absorbent body toward the outside in the transverse direction,

[0112] A guide mark for guiding the position where the buttocks of the wearer should be placed is formed on the absorbent body in a manner that can be visually recognized from the skin surface side.

[0113] The absorbent core is at least partially narrowed toward the inner side in the transverse direction at a position closer to the ventral side than the guide mark.

[0114] 2. The diaper according to item 1, wherein:

[0115] The absorbent core has a pair of channel portions, the pair of channel portions are formed symmetrically with respect to a longitudinal center line passing through the center in the transverse direction of the absorbent body, and have a lower basis weight than other portions of the absorbent core.

[0116] At least parts of the pair of channel portions are arranged closer to the ventral side than the guide mark.

[0117] 3. The diaper according to item 1 or 2, wherein:

[0118] The absorbent core includes a narrowed region whose width in the transverse direction is narrower than an end portion of the back side of the absorbent core,

[0119] The guide mark is arranged at a position overlapping with the narrowed region when viewed from the skin surface side.

[0120] 4. The diaper according to any one of items 1 to 3, wherein

[0121] An area of ​​a portion of the narrowed region that is closer to the ventral side than the guide mark is larger than an area of ​​a portion of the narrowed region that is closer to the dorsal side than the guide mark.

[0122] 5. The diaper according to any one of items 1 to 4, wherein

[0123] The absorbent body has an indicator portion extending in the longitudinal direction and changing color in response to the body fluid of the wearer.

[0124] The guide mark is arranged at a position closer to the rear side than an end portion of the rear side of the indicator portion.

[0125] 6. The diaper according to any one of items 1 to 5, wherein

[0126] The surface sheet includes a central sheet covering the absorbent core and a pair of side sheets covering both sides of the central sheet in the transverse direction.

[0127] The pair of side sheets include a back fixing portion fixed to the central sheet at a position closer to the back side than a transverse center line passing through the center in the longitudinal direction of the absorbent body,

[0128] In the longitudinal direction, the guide mark is arranged at a position closer to the ventral side than a midline between the ventral end of the dorsal fixing portion and the transverse center line.

[0129] 7. The diaper according to any one of items 1 to 6, wherein

[0130] The guide mark has a shape that mimics the shape of a buttocks.

[0131] 8. The diaper according to any one of items 1 to 7, wherein

[0132] The guide mark includes two curved portions convex toward the ventral side.

[0133] 9. The diaper according to any one of items 1 to 8, wherein

[0134] The guide mark includes a connecting portion that connects one ends of the two curved portions to each other.

[0135] The connecting portion is disposed on a longitudinal center line passing through the center of the absorbent body in the transverse direction.

[0136] 10. The diaper according to any one of items 1 to 9, wherein

[0137] The other ends of the two curved portions are arranged on the rear side relative to the connecting portion.

[0138] 11. The diaper according to any one of items 1 to 10, wherein

[0139] When the part of the two curved parts that protrudes most toward the ventral side is set as the lowest point, the first angle formed by an imaginary line connecting one end of the two curves and the lowest point with respect to a baseline parallel to the lateral direction is larger than the second angle formed by an imaginary line connecting the other end of the two curves and the lowest point with respect to the baseline.

[0140] 12. The diaper according to any one of items 1 to 11, wherein

[0141] The line width of the two curved portions is 0.3% or more and 3.5% or less with respect to the entire length of the absorbent body in the longitudinal direction.

[0142] 13. The diaper according to any one of items 1 to 12, wherein

[0143] A width of the guide mark in the transverse direction is greater than a width of the guide mark in the longitudinal direction.

[0144] 14. The diaper according to any one of items 1 to 13, wherein

[0145] The absorbent body includes a pair of upright leakage-proof gathers arranged on the outer side of the absorbent core in the transverse direction.

[0146] When the pair of anti-leakage gathers are in an upright state, the other ends of the two curved portions of the guide mark are exposed, and when the pair of anti-leakage gathers are in a non-erect state, the other ends of the two curved portions of the guide mark are covered by the pair of anti-leakage gathers.

[0147] 15. The diaper according to any one of items 1 to 14, wherein

[0148] The pair of channel portions extend from a position closer to the ventral side than the guide mark to a position closer to the dorsal side than the guide mark,

[0149] The length of the portion of the pair of channel portions closer to the ventral side than the guide mark is longer than the length of the portion of the pair of channel portions closer to the dorsal side than the guide mark.

[0150] 16. The diaper according to any one of items 1 to 15, wherein

[0151] A width of the guide mark in the lateral direction is greater than a distance between the pair of channel portions in the lateral direction.

[0152] 17. The diaper according to any one of items 1 to 16, wherein

[0153] The dorsal end portions of the pair of channel portions are arranged closer to the ventral side than the guide mark.

[0154] 18. The diaper according to any one of items 1 to 17, wherein

[0155] The absorbent core includes an embossed portion having a concavo-convex processing,

[0156] The guide mark is arranged at a position overlapping with the embossed portion when viewed from the skin surface side.

[0157] 19. The diaper according to any one of items 1 to 18, wherein

[0158] The guide mark is printed on a sheet disposed between the top sheet and the absorbent core.

[0159] 20. The diaper according to any one of items 1 to 19, wherein

[0160] The sheet material is tissue paper comprising pulp.

[0161] 21. The diaper according to any one of items 1 to 20, wherein

[0162] The guide mark is printed on the non-skin surface of the sheet.

[0163] 22. The diaper according to any one of items 1 to 21, wherein

[0164] The skin-facing surface and the non-skin-facing surface of the sheet are respectively bonded to the topsheet or the absorbent core using a hot-melt adhesive.

[0165] 23. The diaper according to any one of items 1 to 22, wherein

[0166] When the side panel is folded inward in the transverse direction, at least a portion of the guide mark is formed at a position that can be visually recognized from the skin-facing side.

[0167] 24. The diaper according to item 1, wherein:

[0168] The guide mark is printed in a color included in the range of 5GY to 10RP of the Munsell color circle.

[0169] 25. A diaper extending in a longitudinal direction connecting the belly side to the back side of a wearer and in a transverse direction perpendicular to the longitudinal direction, wherein:

[0170] This diaper has:

[0171] an absorbent body including a top sheet disposed on the skin-facing side of the wearer, a back sheet disposed on the non-skin-facing side of the wearer, and an absorbent core disposed between the top sheet and the back sheet; and

[0172] a pair of fastening pieces extending from the absorbent body toward the outside in the transverse direction,

[0173] A guide mark for guiding the position where the buttocks of the wearer should be placed is formed on the absorbent body in a manner that can be visually recognized from the skin surface side.

[0174] The absorbent core has a pair of channel portions, the pair of channel portions are formed symmetrically with respect to a longitudinal center line passing through the center in the transverse direction of the absorbent body, and have a lower basis weight than other portions of the absorbent core.

[0175] At least parts of the pair of channel portions are arranged closer to the ventral side than the guide mark.

[0176] 26. The diaper according to item 25, wherein:

[0177] The absorbent core is at least partially narrowed toward the inner side in the transverse direction at a position closer to the ventral side than the guide mark.

[0178] 27. A diaper extending in a longitudinal direction connecting the belly side to the back side of a wearer and in a transverse direction perpendicular to the longitudinal direction, wherein:

[0179] This diaper has:

[0180] An absorbent body including a top sheet disposed on the skin side of the wearer, a back sheet disposed on the non-skin side opposite to the skin side, and an absorbent core disposed between the top sheet and the back sheet;

[0181] a pair of fastening tabs extending from the absorbent body toward the outside in the transverse direction; and

[0182] an elastic member disposed along both end edges of the absorbent body in the transverse direction and capable of stretching and contracting in the longitudinal direction,

[0183] A guide mark for guiding the position where the buttocks of the wearer should be placed is formed on the absorbent body in a manner that can be visually recognized from the skin surface side.

[0184] When viewed from the skin surface side, an imaginary line connecting the end edge on the ventral side of the guide mark and the end edges on the ventral side of the pair of fastening pieces intersects the elastic member.

[0185] 28. A diaper extending in a longitudinal direction connecting the belly side to the back side of a wearer and in a transverse direction perpendicular to the longitudinal direction, wherein:

[0186] This diaper has:

[0187] An absorbent body including a top sheet disposed on the skin side of the wearer, a back sheet disposed on the non-skin side opposite to the skin side, and an absorbent core disposed between the top sheet and the back sheet;

[0188] a pair of stretchable wings extending from the absorbent body toward the outside in the transverse direction; and

[0189] a pair of fastening plates, which are mounted on the pair of telescopic wings,

[0190] A guide mark for guiding the position where the buttocks of the wearer should be placed is formed on the absorbent body in a manner that can be visually recognized from the skin surface side.

[0191] The pair of stretchable wings are joined to the absorbent body via a joining portion.

[0192] When viewed from the skin surface side, an imaginary line connecting the end edge on the ventral side of the guide mark and the end edge on the ventral side of the joining portion partially overlaps the pair of stretchable wings.

[0193] 29. A diaper extending in a longitudinal direction connecting the belly side to the back side of a wearer and in a transverse direction perpendicular to the longitudinal direction, wherein:

[0194] This diaper has:

[0195] An absorbent body including a top sheet disposed on the skin-facing side of the wearer, a back sheet disposed on the non-skin-facing side opposite to the skin-facing side, and an absorbent core disposed between the top sheet and the back sheet; and

[0196] a pair of fastening pieces extending from the absorbent body toward the outside in the transverse direction,

[0197] A guide mark for guiding the position where the buttocks of the wearer should be placed is formed on the absorbent body in a manner that can be visually recognized from the skin surface side.

[0198] The absorbent body comprises: a central indicator portion extending in the longitudinal direction and changing color in response to the body fluid of the wearer; and a message indicator portion disposed on the ventral side of the central indicator portion and changing color in response to the body fluid of the wearer to display message information.

[0199] In the longitudinal direction, a distance from a transverse centerline passing through the center of the absorbent body in the longitudinal direction to the ventral end of the message indicator portion is longer than a distance from the transverse centerline to the guide mark.

[0200] Description of Reference Numerals

[0201] 1. 1A, diaper; 10. surface sheet; 11. center sheet; 12. side sheet; 20. back sheet; 30. 30A, absorbent core; 43. narrowed area; 55. sheet; 60. guide mark; 61. curve part; 62. one end; 63. other end; 64. lowest point; 65. connecting part; 66. reference line; 67. 68. imaginary line; 70. 70A, channel part; 72. indicator part; 80. leak-proof pleats; 84. back fixing part; 90. fastening sheet; CL1, transverse center line; CW, longitudinal center line; X, transverse direction; Y, longitudinal direction; Z1, skin side; Z2, non-skin side; θ1, first angle; θ2, second angle.

Claims

1. A diaper extending in a longitudinal direction connecting a wearer's belly side to a back side and in a transverse direction perpendicular to the longitudinal direction, wherein: This diaper has: An absorbent body including a top sheet disposed on the skin side of the wearer, a back sheet disposed on the non-skin side opposite to the skin side, and an absorbent core disposed between the top sheet and the back sheet; as well as a pair of fastening pieces extending from the absorbent body toward the outside in the transverse direction, A guide mark for guiding the position where the buttocks of the wearer should be placed is formed on the absorbent body in a manner that can be visually recognized from the skin surface side. The absorbent core is at least partially narrowed toward the inner side in the transverse direction at a position closer to the ventral side than the guide mark.

2. The diaper according to claim 1, wherein: The absorbent core has a pair of channel portions, the pair of channel portions are formed symmetrically with respect to a longitudinal center line passing through the center in the transverse direction of the absorbent body, and have a lower basis weight than other portions of the absorbent core. At least parts of the pair of channel portions are arranged closer to the ventral side than the guide mark.

3. The diaper according to claim 1, wherein: The absorbent core includes a narrowed region whose width in the transverse direction is narrower than an end portion of the back side of the absorbent core, The guide mark is arranged at a position overlapping with the narrowed region when viewed from the skin surface side.

4. The diaper according to claim 3, wherein: An area of ​​a portion of the narrowed region that is closer to the ventral side than the guide mark is larger than an area of ​​a portion of the narrowed region that is closer to the dorsal side than the guide mark.

5. The diaper according to claim 1, wherein: The absorbent body has an indicator portion extending in the longitudinal direction and changing color in response to the body fluid of the wearer. The guide mark is arranged at a position closer to the rear side than an end portion of the rear side of the indicator portion.

6. The diaper according to claim 1, wherein: The surface sheet includes a central sheet covering the absorbent core and a pair of side sheets covering both sides of the central sheet in the transverse direction. The pair of side sheets include a back fixing portion fixed to the central sheet at a position closer to the back side than a transverse center line passing through the center in the longitudinal direction of the absorbent body, In the longitudinal direction, the guide mark is arranged at a position closer to the ventral side than a midline between the ventral end of the dorsal fixing portion and the transverse center line.

7. The diaper according to claim 1, wherein: The guide mark has a shape that mimics the shape of a buttocks.

8. The diaper according to claim 1, wherein: The guide mark includes two curved portions convex toward the ventral side.

9. The diaper according to claim 8, wherein: The guide mark includes a connecting portion that connects one ends of the two curved portions to each other. The connecting portion is disposed on a longitudinal center line passing through the center of the absorbent body in the transverse direction.

10. The diaper according to claim 9, wherein: The other ends of the two curved portions are arranged on the rear side relative to the connecting portion.

11. The diaper according to claim 10, wherein: When the part of the two curved parts that protrudes most toward the ventral side is set as the lowest point, the first angle formed by an imaginary line connecting one end of the two curves and the lowest point with respect to a baseline parallel to the lateral direction is larger than the second angle formed by an imaginary line connecting the other end of the two curves and the lowest point with respect to the baseline.

12. The diaper according to claim 8, wherein: The line width of the two curved portions is 0.3% or more and 3.5% or less with respect to the entire length of the absorbent body in the longitudinal direction.

13. The diaper according to claim 1, wherein: A width of the guide mark in the transverse direction is greater than a width of the guide mark in the longitudinal direction.

14. The diaper according to claim 10, wherein: The absorbent body includes a pair of upright leakage-proof gathers arranged on the outer side of the absorbent core in the transverse direction. When the pair of anti-leakage gathers are in an upright state, the other ends of the two curved portions of the guide mark are exposed, and when the pair of anti-leakage gathers are in a non-erect state, the other ends of the two curved portions of the guide mark are covered by the pair of anti-leakage gathers.

15. The diaper according to claim 2, wherein: The pair of channel portions extend from a position closer to the ventral side than the guide mark to a position closer to the dorsal side than the guide mark, The length of the portion of the pair of channel portions closer to the ventral side than the guide mark is longer than the length of the portion of the pair of channel portions closer to the dorsal side than the guide mark.

16. The diaper according to claim 15, wherein: A width of the guide mark in the lateral direction is greater than a distance between the pair of channel portions in the lateral direction.

17. The diaper according to claim 2, wherein: The dorsal end portions of the pair of channel portions are arranged closer to the ventral side than the guide mark.

18. The diaper according to claim 1, wherein: The absorbent core includes an embossed portion having a concavo-convex processing, The guide mark is arranged at a position overlapping with the embossed portion when viewed from the skin surface side.

19. The diaper according to claim 1, wherein: The guide mark is printed on a sheet disposed between the top sheet and the absorbent core.

20. The diaper according to claim 19, wherein: The sheet material is tissue paper comprising pulp.

21. The diaper according to claim 19, wherein: The guide mark is printed on the non-skin surface of the sheet.

22. The diaper according to claim 19, wherein: The skin-facing surface and the non-skin-facing surface of the sheet are respectively bonded to the topsheet or the absorbent core using a hot-melt adhesive.

23. The diaper according to claim 6, wherein: When the side panel is folded inward in the transverse direction, at least a portion of the guide mark is formed at a position that can be visually recognized from the skin-facing side.

24. The diaper according to claim 1, wherein: The guide mark is printed in a color included in the range of 5GY to 10RP of the Munsell color circle.

25. A diaper extending in a longitudinal direction connecting the belly side to the back side of a wearer and in a transverse direction perpendicular to the longitudinal direction, wherein: This diaper has: An absorbent body including a top sheet disposed on the skin side of the wearer, a back sheet disposed on the non-skin side of the wearer, and an absorbent core disposed between the top sheet and the back sheet; as well as a pair of fastening pieces extending from the absorbent body toward the outside in the transverse direction, A guide mark for guiding the position where the buttocks of the wearer should be placed is formed on the absorbent body in a manner that can be visually recognized from the skin surface side. The absorbent core has a pair of channel portions, the pair of channel portions are formed symmetrically with respect to a longitudinal center line passing through the center in the transverse direction of the absorbent body, and have a lower basis weight than other portions of the absorbent core. At least parts of the pair of channel portions are arranged closer to the ventral side than the guide mark.

26. The diaper according to claim 25, wherein: The absorbent core is at least partially narrowed toward the inner side in the transverse direction at a position closer to the ventral side than the guide mark.

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