WO2024004417A1

WO2024004417A1 - Diaper

Info

Publication number: WO2024004417A1
Application number: PCT/JP2023/018404
Authority: WO
Inventors: 真紀辻井
Original assignee: ユニ・チャーム株式会社
Priority date: 2022-06-27
Filing date: 2023-05-17
Publication date: 2024-01-04

Abstract

In one embodiment of the present invention, a diaper is provided with: a top sheet positioned on a wearer's skin surface side; a back sheet positioned on the side opposite to the wearer's skin surface side; an absorbent body containing an absorbent core and positioned between the top sheet and the back sheet; and a pair of fastening tabs extending laterally outwards from the absorbent body. A guide mark is formed in the absorbent body so as to be visible from the wearer's skin side, and indicates a position where the hips of the wearer should be positioned. The absorbent core is pinched laterally inward at least partially at a position further on the abdomen side than the guide mark.

Description

Diapers

The present disclosure relates to diapers.

A typical tape-type diaper consists of an absorbent main body including a top sheet, a back sheet, and an absorbent core placed between the top sheet and the back sheet, and a pair of fasteners extending outside of the absorbent main body. Equipped with a tab. To put on this type of diaper, the wearer lies on their back over the unfolded diaper, the diaper is passed through the wearer's crotch and pulled up to the ventral side, and the pair of fastening tabs are placed on the ventral side of the absorbent body. It is locked to the locked part.

When putting the diaper on the wearer, if the wearer is placed in the wrong position, the longitudinal ends of the diaper will not be aligned in the vertical direction of the body. It becomes impossible to lock it. If the position of the diaper shifts in the longitudinal direction, gaps tend to form around the wearer's legs and waist, causing urine leakage. In order to solve this problem, Patent Document 1 listed below discloses a diaper in which a mark is displayed on a top sheet to guide the position of the wearer's buttocks.

Japanese Patent Application Publication No. 2014-230716

With the diapers described above, when the diaper is passed through the wearer's crotch and pulled up toward the wearer's abdomen, the absorbent core of the diaper may get caught around the wearer's legs, preventing the diaper from being pulled up fully toward the wearer's abdomen. be. If the diaper is not pulled up sufficiently, the position of the diaper may shift in the longitudinal direction even if the wearer is placed in the correct position.

Therefore, the present disclosure aims to suppress the displacement of the diaper.

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. This diaper has a top sheet placed on the wearer's skin side, a back sheet placed on the non-skin side opposite to the skin side, and a sheet placed between the top sheet and the back sheet. The absorbent body includes an absorbent body including an absorbent core, and a pair of fastening tabs extending laterally outward from the absorbent body. The absorbent body is formed with a guide mark that is visible from the skin side to guide the position where the wearer's buttocks should be placed, and the absorbent core is formed at least partially at a position on the ventral side of the guide mark. It is bound laterally inward.

In the diaper of this embodiment, the absorbent core is at least partially constricted at a position on the ventral side of the guide mark, so that when the diaper is pulled up to the ventral side through the wearer's crotch, the absorbent core is attached to the wearer's legs. becomes less likely to interfere with Therefore, the diaper can be sufficiently pulled up to the ventral side, and as a result, the diaper can be prevented from shifting.

In one embodiment, the absorbent core has a pair of channel portions formed symmetrically about a longitudinal centerline passing through the lateral center of the absorbent body and having a lower basis weight than other portions of the absorbent core. However, at least a portion of the pair of channel portions may be disposed on the ventral side of the guide mark. Since the pair of channel portions have lower rigidity than other portions of the absorbent core, the absorbent core tends to bend starting from the pair of channel portions when the absorbent core comes into contact with the wearer's legs. Therefore, when the diaper is passed through the wearer's crotch and pulled up toward the abdomen, the absorbent core bends and becomes less likely to interfere with the wearer's legs. As a result, it becomes possible to sufficiently pull up the diaper toward the ventral side, and the displacement of the diaper is suppressed.

In one embodiment, the absorbent core includes a waist region that is narrower in width in the lateral direction than the dorsal end of the absorbent core, and the guide mark is located at a position overlapping the waist region when viewed from the skin side. It may be placed in Note that the area of the portion of the constriction region on the ventral side of the guide mark may be larger than the area of the portion of the constriction region on the dorsal side of the guide mark. In this embodiment, the absorbent core is less likely to interfere with the wearer's legs when the diaper is pulled up ventrally through the wearer's crotch.

In one embodiment, the absorbent body has an indicator that extends longitudinally and changes color upon reaction with bodily fluids of the wearer, and the guide mark is located dorsally relative to the dorsal end of the indicator. You can leave it there. By arranging the indicator more ventrally than the guide mark, the indicator comes into contact with the wearer's urine more easily, allowing the user to recognize urination.

In one embodiment, the top sheet includes a center sheet that covers the absorbent core and a pair of side sheets that cover both sides of the center sheet in the lateral direction, and the pair of side sheets are located at the longitudinal center of the absorbent body. includes a dorsal fixed part fixed to the center sheet dorsal to the transverse center line that passes through, and in the longitudinal direction, the guide mark is located from the midpoint between the ventral end of the dorsal fixed part and the transverse center line. may also be placed on the ventral side. By arranging the guide mark on the ventral side of the midpoint between the ventral end of the dorsal side fixing part and the transverse center line, it is possible to guide the wearer's buttocks to the correct position.

In one embodiment, the guide mark may have a shape that mimics the shape of a buttocks. By forming the guide mark in a shape that imitates the shape of the buttocks, the user can be prompted to align the wearer's buttocks with the guide mark.

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

In one embodiment, the guide mark includes a connecting part in which one ends of two curved parts are connected to each other, and the connecting part may be arranged on a longitudinal centerline passing through the horizontal center of the absorbent main body. By arranging the connecting portion on the longitudinal centerline, it is possible to encourage the user to align the buttocks with the center in the width direction. Note that the other ends of the two curved portions may be arranged on the back side of the connecting portion.

In one embodiment, when the lowest point is the most ventrally protruding part of the two curved parts, an imaginary line connecting the lowest point and one end of the two curves with respect to a reference line parallel to the lateral direction is used. The first angle formed by the line may be larger than the second angle formed by the imaginary line connecting the lowest point and the other ends of the two curves with respect to the reference line. By making the first angle larger than the second angle, the guide mark can be shaped to resemble a butt.

In one embodiment, the line width of the two curved portions may be 0.3% or more and 3.5% or less with respect to the total length of the absorbent main body in the longitudinal direction. If the line widths of the two curved parts are too small, it will be difficult for the user to recognize the guide mark, and if the line widths of the two curved parts are too large, it will be difficult for the user to place the buttocks in the correct position. By setting the line width of the two curved parts to 0.3% or more and 3.5% or less of the total length of the absorbent body, the guide mark can be easily recognized and the shift in the position of the buttocks can be suppressed. Can be done. Note that the width of the guide mark in the horizontal direction may be larger than the width of the guide mark in the vertical direction.

In one embodiment, the absorbent body includes a pair of upright leak-proof gathers disposed laterally outwardly of the absorbent core, and when the pair of leak-proof gathers are in the upright state, two of the guide marks The other ends of the curved portions may be exposed, and the other ends of the two curved portions of the guide mark may be covered by the pair of leakage preventive gathers when the pair of leakage preventive gathers are in the non-upright state. In this embodiment, since the guide mark can be visually recognized when putting on the diaper, the position where the buttocks should be placed can be appropriately guided.

In one embodiment, the pair of channel portions extend from a location ventral to the guide mark to a location dorsal to the guide mark, and the length of the portion of the pair of channel portions ventral to the guide mark is , may be longer than the length of the portion on the dorsal side of the guide marks of the pair of channel portions. By making the length of the ventral side of the pair of channel portions longer than the guide marks, the absorbent core becomes easier to bend on the ventral side of the guide marks and becomes less likely to interfere with the wearer's legs.

In one embodiment, the width of the guide mark in the lateral direction may be greater than the distance between the pair of channel portions in the lateral direction. In this embodiment, the absorbent core is more likely to bend along the wearer's buttock crevice and less likely to interfere with the wearer's legs. Note that the dorsal end portions of the pair of channel portions may be arranged on the ventral side of the guide mark.

In one embodiment, the absorbent core may include an embossed portion that is textured, and the guide mark may be placed at a position overlapping the embossed portion when viewed from the skin side. Since wrinkles are less likely to occur in the embossed portion, by arranging the guide mark at a position overlapping the embossed portion, the guide mark becomes easier to visually recognize.

In one embodiment, the guide marks may be printed on a sheet material disposed between the topsheet and the absorbent core. Note that the sheet material may be a tissue containing pulp. By printing the guide marks on the sheet material disposed between the topsheet and the absorbent core, ink is less likely to transfer to the wearer's buttocks. Note that the guide mark may be printed on the non-skin side surface of the sheet material. This makes it possible to more reliably prevent ink from transferring to the wearer's buttocks.

In one embodiment, at least one of the skin-side surface and the non-skin-side surface of the sheet material may be adhered to the top sheet or the absorbent core with a hot melt adhesive. By adhering at least one surface of the sheet material to the top sheet or the absorbent core, the sheet material is prevented from rubbing against the top sheet or the absorbent core and being torn.

In one embodiment, at least a portion of the guide mark may be formed at a position that is visible from the skin side when the side sheet is folded inward in the lateral direction. Since the guide mark is visible when the side seat is folded, it becomes easier for the user to recognize the presence of the guide mark.

In another aspect, a diaper is provided that extends in the longitudinal direction connecting the wearer's ventral side to the dorsal side, and in the lateral direction perpendicular to the longitudinal direction. This diaper includes a top sheet placed on the wearer's skin side, a back sheet placed on the wearer's non-skin side, and an absorbent core placed between the top sheet and the back sheet. and a pair of fastening tabs extending laterally outward from the absorbent body. A guide mark is formed on the absorbent body so as to be visible from the skin side to guide the position where the wearer's buttocks should be placed, and the absorbent core has a vertical center that passes through the horizontal center of the absorbent body. It has a pair of channel parts that are formed symmetrically with respect to the line and have a lower basis weight than other parts of the absorbent core, and at least a part of the pair of channel parts is arranged on the ventral side of the guide mark. There is.

In the diaper of this embodiment, a pair of channel portions having a lower basis weight are formed on the ventral side of the guide mark. Since the pair of channel parts have lower rigidity than other parts of the absorbent core, when the absorbent core comes into contact with the wearer's legs, the absorbent core easily bends starting from the pair of channel parts. Therefore, when the diaper is passed through the wearer's crotch and pulled up to the ventral side, the absorbent core is less likely to bend and interfere with the wearer's legs. As a result, it becomes possible to sufficiently pull up the diaper toward the ventral side, and the displacement of the diaper is suppressed.

In one embodiment, the absorbent core may be at least partially constricted inward in the lateral direction at a position ventral to the guide mark. Since the absorbent core is at least partially constricted at a position on the ventral side of the guide mark, the absorbent core is less likely to interfere with the wearer's legs when the diaper is passed through the wearer's crotch and pulled up to the ventral side. Therefore, the diaper can be sufficiently pulled up to the ventral side, and displacement of the diaper can be suppressed.

According to various aspects and embodiments of the present invention, it is possible to suppress the diaper from shifting.

FIG. 1 is a plan view of a diaper according to an embodiment, viewed from the skin side. FIG. 2 is a plan view of the diaper shown in FIG. 1 viewed from the non-skin side. 2 is a sectional view taken along line III-III shown in FIG. 1. FIG. FIG. 3 is an enlarged view showing the vicinity of a guide mark. FIG. 3 is a plan view of a diaper according to another embodiment. It is a top view of the diaper concerning yet another embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following description, the same or equivalent elements are given the same reference numerals, and overlapping descriptions will not be repeated. The dimensional proportions in the drawings do not necessarily correspond to those in the description.

FIG. 1 is a plan view of a diaper 1 according to one embodiment, viewed from the skin side. FIG. 2 is a plan view of the diaper 1 viewed from the non-skin side. FIG. 3 is a schematic cross-sectional view of the diaper 1 taken along the line III-III shown in FIG. FIGS. 1 and 2 show the diaper 1 in an unfolded state that has been stretched to a state where no wrinkles are formed. In the following description, unless otherwise specified, the positional relationship in the unfolded state will be described. In addition, in the cross-sectional view of FIG. 3, for convenience of explanation, each member is shown separated in the thickness direction Z, but in an actual product, they are in contact with each other in the thickness direction Z.

The diaper 1 shown in FIGS. 1 to 3 is a tape-type disposable diaper. The diaper 1 may be a child's diaper or an adult's diaper. In the following description, a person who wears the diaper 1 will be referred to as a "wearer," and a person who makes the wearer wear the diaper 1 will be referred to as a "user." Typically, the wearer is a child or care recipient and the user is a parent or caregiver.

As shown in FIG. 1, the diaper 1 extends in a horizontal direction X along the wearer's waist circumference, and in a vertical direction Y connecting the wearer's ventral side to his dorsal side. The horizontal direction X corresponds to the width direction of the diaper 1, and the vertical direction Y corresponds to the longitudinal direction of the diaper 1. The horizontal direction X and the vertical direction Y are directions perpendicular to each other. The thickness direction Z is a direction perpendicular to the horizontal direction includes a non-skin surface side Z2 directed to the opposite side. The diaper 1 is worn to cover the wearer's abdomen, crotch, and back.

The diaper 1 includes an absorbent main body 2 and a pair of fastening tabs 90. The absorbent main 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 side edge 2F is arranged on the ventral side in the direction of the wearer's waist when worn, and the back side edge 2R is arranged on the back side in the direction of the wearer's waist when worn. 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 main body 2. In the following description, the ventral edge 2F in the longitudinal direction Y will be referred to as the ventral side, and the dorsal edge 2R in the longitudinal direction Y will be referred to as the dorsal side.

The absorbent main 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 widths of the dorsal region 51 and the ventral region 52 in the lateral direction X.

A pair of flap portions 15 are formed in the dorsal region 51 of the absorbent body 2 and project outward from the absorbent body 2 in the lateral direction X. The width of the pair of flap portions 15 in the lateral direction X corresponds to the maximum width of the absorbent main body 2.

A pair of fastening tabs 90 are provided on the pair of flap parts 15, respectively. The pair of fastening tabs 90 extend outward in the lateral direction X from the side edge 2S of the absorbent main body 2. Each of the pair of fastening tabs 90 includes a base sheet 91 joined to the flap portion 15 and a joint portion 92 provided on the base sheet 91. The joint portion 92 is arranged on the skin surface side Z1 surface of the base sheet 91. The joining portion 92 is, for example, a mechanical fastener, and is configured to be able to be joined to the target portion 45 formed on the non-skin surface side Z2 of the absorbent main body 2.

As shown in FIG. 2, the target portion 45 is provided on the non-skin surface side Z2 of the ventral region 52 of the absorbent main body 2. The target portion 45 has a band-like shape extending in the lateral direction X. The target portion 45 is disposed on the ventral side of the pair of fastening tabs 90 and engages with the pair of fastening tabs 90. Note that the absorbent body 2 may not include the target portion 45, and may be configured such that the joint portion 92 of the pair of fastening tabs 90 is directly joined to the back sheet 20 of the absorbent body 2, which will be described later.

As shown in FIGS. 1 to 3, the absorbent main body 2 includes a top sheet 10, a back sheet 20, and an absorbent core 30. The top sheet 10 constitutes the surface of the absorbent main body 2 that is applied to the wearer, and is disposed on the skin side Z1. The top sheet 10 includes a center sheet 11 that is arranged at the center in the lateral direction X and covers the absorbent core 30, and a pair of side sheets 12 that cover both sides of the center sheet 11 in the lateral direction X. The center sheet 11 is made of, for example, a liquid-permeable nonwoven fabric that allows urine of the wearer to pass through to the absorbent core 30 side, and the side sheets 12 are made of, for example, a liquid-impermeable nonwoven fabric.

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. A pair of elastic members 13, which are stretched in the vertical direction Y, are arranged between the folded pair of side sheets 12. 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-preventing gathers 80 are erect leak-preventing gathers, and are arranged closer to the skin side Z1 than the absorbent core 30.

As shown in FIG. 1, the pair of leakage preventive gathers 80 are arranged on the outside of the absorbent core 30 in the lateral direction X, and prevent urine excreted into the absorbent core 30 from leaking in the lateral direction X. Each of the pair of leakage prevention gathers 80 includes an elastic member 13 extending in the vertical direction Y, an upright portion 81 that stands up due to contraction of the elastic member 13, and a horizontal fixed portion that serves as an upright fulcrum for the upright portion 81 in the horizontal direction X. 82, and a vertical fixing portion 83 that serves as an upright fulcrum for the upright portion 81 in the vertical direction Y.

The elastic member 13 extends in the vertical direction Y along the inner edge of the side sheet 12 in the horizontal direction X. The elastic member 13 is made of a stretchable material such as rubber or spandex that can be contracted in the length direction. The elastic members 13 of the pair of leakage preventive gathers 80 are arranged apart from each other across the vertical center line CW passing through the center of the absorbent main body 2 in the horizontal direction It is fixed at 12. The dorsal end of the elastic member 13 is arranged in the dorsal region 51, and the ventral end of the elastic member 13 is arranged in the ventral region 52.

The horizontal fixing portion 82 is formed on substantially the entire area of the absorbent body 2 in the vertical direction Y at a position outside the upright portion 81 in the horizontal direction X of the side sheet 12 . That is, the lateral fixing part 82 is arranged outside the absorbent core 30 in the lateral direction X. The lateral fixing portion 82 is a part of the side seat 12 and is fixed to the center seat 11. The lateral fixing portion 82 serves as a fulcrum for the erecting portion 81 in the lateral direction X.

The vertical fixing part 83 is formed inside the horizontal fixing part 82 in the horizontal direction X. The vertical fixing part 83 includes a dorsal fixing part 84 disposed in the dorsal region 51 and a ventral fixing part 85 disposed in the ventral region 52. The back side fixing part 84 and the ventral side fixing part 85 are part of the side seat 12 and are fixed to the center seat 11. The dorsal side fixing part 84 and the ventral side fixing part 85 serve as erecting fulcrums on the dorsal side and the ventral side of the upright part 81, respectively.

The standing portion 81 is formed between the dorsal side fixing portion 84 and the ventral side fixing portion 85. That is, the upright portion 81 is disposed at a position inside the horizontal fixing portion 82 in the horizontal direction X, and at a position inside the vertical fixing portion 83 in the vertical direction Y. The upright portion 81 is a portion of the side seat 12 that is not fixed to the center seat 11. The elastic member 13 is connected to the upright portion 81 in a stretched state in the vertical direction Y. As the elastic member 13 contracts in the vertical direction Y, the absorbent main body 2 is deformed in the closing direction, and the upright portion 81 rises from the horizontal fixing portion 82 as a starting point. In this way, the upright portion 81 stands up at a position sandwiching the absorbent core 30 from the lateral direction X, thereby preventing urine leakage.

The back sheet 20 constitutes the surface of the absorbent main body 2 that is located on the outside when worn, and is arranged on the non-skin side Z2. The back sheet 20 includes a liquid-impermeable back film 21 and a back nonwoven fabric 22 located closer to the non-skin side Z2 than the back film 21. The width of the back film 21 in the lateral direction X may be shorter than the width of the back nonwoven fabric 22 in the lateral direction X, and the back nonwoven fabric 22 may extend further than the back film 21 on both sides in the lateral direction X. The back nonwoven fabric 22 constitutes the outermost layer of the diaper 1.

The absorbent core 30 is arranged between the top sheet 10 and the back sheet 20. The absorbent core 30 includes, for example, pulp fibers and a polymeric absorbent (SAP) having water absorption properties, and absorbs the wearer's urine. As shown in FIG. 3, the upper and lower surfaces of the absorbent core 30 may be covered with a core wrap 38. The absorbent core 30 is arranged approximately at the center of the absorbent main body 2 in the lateral direction X.

The absorbent core 30 has a dorsal edge 30R and a ventral edge 30F. The back end edge 30R of the absorbent core 30 has a width W1 in the lateral direction X. The width W1 is the maximum width of the absorbent core 30. The width W1 of the back edge 30R is larger than the distance d between the pair of leakage preventive gathers 80 in the non-upright state. The ventral edge 30F of the absorbent core 30 has, for example, the same width as the dorsal edge 30R. A constricted region 43 in which the width of the absorbent core 30 is narrowed is formed between the ventral edge 30F and the dorsal edge 30R. The constricted region 43 is, for example, a region of the absorbent core 30 in which the width in the lateral direction X is narrowed by 10% or more with respect to the width W1 of the ventral edge 30F and the dorsal edge 30R.

The constricted region 43 includes a narrowed portion 36 whose width in the lateral direction X is narrowest. The width W2 of the narrowed portion 36 is smaller than the width W1 of the back edge 30R of the absorbent core 30. The width of the constriction region 43 is continuously narrowed from the dorsal edge 30R toward the narrowing portion 36. Similarly, the width of the constricted region 43 is continuously narrowed from the ventral edge 30F toward the narrowed portion 36.

The narrowed portion 36 is located on the ventral side of the transverse center line CL1 passing through the center of the absorbent body 2 in the longitudinal direction Y, and on the dorsal side of the midline CL2 between the transverse center line CL1 and the ventral edge 2F. You can leave it there. Note that the transverse center line CL1 is a portion where a crease is formed when the diaper 1 is folded in half in the longitudinal direction Y. The narrowed portion 36 is located near the wearer's crotch when the wearer wears the diaper 1.

As shown in FIG. 1, a pair of channel portions 70 may be formed in the absorbent core 30. The pair of channel portions 70 are arranged symmetrically with respect to the longitudinal centerline CW of the absorbent main body 2. The basis weight of the pair of channel parts 70 is set lower than the basis weight of other parts of the absorbent core 30. Therefore, the density of the pulp fibers and superabsorbent polymer present in the pair of channel portions 70 is lower than the density of the pulp fibers and superabsorbent polymer present in the other portions of the absorbent core 30. In one embodiment, the pair of channel portions 70 may be slits with zero basis weight.

The pair of channel portions 70 extend linearly in the vertical direction Y. Note that the pair of channel portions 70 may extend in a curved manner in the vertical direction Y. In the diaper 1 shown in FIG. 1, the pair of channel portions 70 are arranged on the ventral side of a guide mark 60, which will be described later. That is, the pair of channel portions 70 are formed at positions that do not overlap the guide marks 60 when viewed from the thickness direction Z.

Since the basis weight of the pair of channel portions 70 is lower than the basis weight of other portions of the absorbent core 30, the pair of channel portions 70 have lower rigidity than the 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.

Furthermore, an embossed portion having an uneven shape may be formed on the surface of the absorbent core 30 by embossing. The embossed portion may be formed over the entire area of the absorbent core 30, or may be formed only on a part of the absorbent core 30.

A guide mark 60 is formed on the absorbent main body 2 to guide the position where the wearer's buttocks should be placed. The guide mark 60 is printed on the absorbent main body 2 so as to be visible from the skin side Z1. As shown in FIG. 1, the guide mark 60 has a substantially W-shaped shape that imitates the buttocks in order to make the user aware that this is the position where the wearer's buttocks should be placed.

As shown in FIG. 3, the guide mark 60 is printed on the sheet material 55 placed between the topsheet 10 and the absorbent core 30. The sheet material 55 is, for example, tissue containing pulp. The surface of the sheet material 55 on the skin side Z1 is adhered to the center sheet 11 of the topsheet 10, and the surface of the sheet material 55 on the non-skin side Z2 is adhered to the core wrap 38 of the absorbent core 30. For example, a hot melt adhesive is used to adhere the sheet material 55. Note that only one of the skin side Z1 and non-skin side Z2 of the sheet material 55 may be adhered to the topsheet 10 or the absorbent core 30.

The guide mark 60 may be printed on the non-skin side Z2 (absorbent core 30 side) of the sheet material 55. The guide mark 60 printed on the non-skin side Z2 of the sheet material 55 is visible from the skin side Z1 through the center sheet 11 and the sheet material 55. To prevent misidentification as blood or feces, the guide mark 60 may 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, for example, in a color included in the range of 5GY to 10RP on the Munsell color wheel.

As shown in FIG. 1, the guide mark 60 is formed on the dorsal side of the narrowed portion 36. In other words, the absorbent core 30 is narrowed inward in the lateral direction X at a position on the ventral side of the guide mark 60. More specifically, the guide mark 60 is arranged on the dorsal side of the transverse center line CL1 of the absorbent main body 2, and closer to the midline CL3 between the transverse center line CL1 and the ventral side end 84F of the dorsal side fixing part 84. It is also located ventrally. Further, when viewed from the skin side Z1, the guide mark 60 overlaps the constriction region 43 of the absorbent core 30. The area of the portion of the constriction region 43 on the ventral side of the guide mark 60 may be larger than the area of the portion of the constriction region 43 on the dorsal side of the guide mark 60.

Note that the guide mark 60 may be formed at a position overlapping the embossed portion of the absorbent core 30 when viewed from the skin side Z1. Since the top sheet 10 placed on the embossed portion is less likely to wrinkle, the visibility of the guide mark 60 is improved by arranging the guide mark 60 at a position overlapping the embossed portion.

FIG. 4 is an enlarged view showing the vicinity of the guide mark 60. As shown in FIG. 4, the guide mark 60 includes two curved portions 61 that curve smoothly so as to be convex toward the ventral side. Each of the two curved portions 61 has one end 62 and the other end 63, and extends between the one end 62 and the other end 63 in a substantially semicircular arc shape. One ends 62 of the two curved parts 61 are connected to each other by a connecting part 65. The connecting portion 65 is arranged on the longitudinal centerline CW of the absorbent main body 2. The other ends 63 of the two curved portions 61 are located on the outer side of the connecting portion 65 in the lateral direction X. Further, the other ends 63 of the two curved portions 61 are arranged on the back side of the connecting portion 65 in the vertical direction Y. By printing the guide mark 60 having the above-described shape on the absorbent main body 2, the user of the diaper 1 associates the shape of the butt with the shape of the guide mark 60, and adjusts the shape of the wearer's butt according to the guide mark 60. Recognize that you should place

Further, the guide mark 60 has a width W3 in the horizontal direction X and a width L2 in the vertical direction Y. The width W3 of the guide mark 60 in the lateral direction X corresponds to the distance in the lateral direction X between the other ends 63 of the two curved portions 61. The width L2 of the guide mark 60 in the vertical direction Y is defined as the width L2 between the lowest point 64 and the other end 63 of the two curved parts 61, when the most protruding part on the ventral side of the two curved parts 61 is the lowest point 64. This corresponds to the distance in the vertical direction Y between and. The width W3 of the guide mark 60 in the horizontal direction X is larger than the width L2 of the guide mark 60 in the vertical direction Y. Therefore, the guide mark 60 has a horizontally long shape that is long in the horizontal direction X.

The width W3 of the guide mark 60 in the lateral direction X is larger than the distance W4 between the pair of channel portions 70 in the lateral direction X. Further, the width W3 of the guide mark 60 in the lateral direction X is smaller than the distance d between the pair of leakage prevention gathers 80 in the non-upright state. Therefore, as shown in FIG. 1, when the pair of leakage prevention gathers 80 is in the non-upright state, the connecting portion 65 of the guide mark 60 is exposed on the skin side Z1, and the two curved portions 61 of the guide mark 60 are exposed. The other end 63 is covered with a pair of leakage prevention gathers 80. That is, when the pair of leakage prevention gathers 80 is in the non-erected state, the guide mark 60 is partially visible. On the other hand, when the pair of leakage prevention gathers 80 is in the upright state, the entire guide mark 60 including the other ends 63 of the two curved portions 61 of the guide mark 60 is exposed to the skin side Z1.

Further, as shown in FIG. 4, the first angle θ1 formed by the virtual line 67 connecting the lowest point 64 and one end 62 of the two curved portions 61 with respect to the reference line 66 parallel to the horizontal direction 66 may be larger than the second angle θ2 formed by the virtual line 68 connecting the lowest point 64 and the other ends 63 of the two curved portions 61. By making the first angle θ1 larger than the second angle, the guide mark 60 can be shaped like a butt. In particular, by increasing the first angle θ1, the angle formed by the two curved portions 61 in the connecting portion 65 becomes smaller, and the connecting portion 65 becomes shaped to sharply protrude toward the back side. By adopting such a shape, it is possible to guide the wearer to align the buttock crack with the connecting portion 65.

Further, 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 with respect to the total length L of the absorbent main body 2 in the longitudinal direction Y. By setting the line width t to 0.3% or more and 3.5% or less with respect to the total length L of the absorbent main body 2, the user can easily recognize the guide mark 60 while suppressing the shift in the position of the buttocks. can do.

Note that a large number of openings may be formed in the center sheet 11 of the top sheet 10. By forming a large number of openings in the center sheet 11, it becomes possible to visually recognize the guide mark 60 through the openings from the skin side Z1, making it easier to recognize the guide mark 60. Note that the distance between the openings in the top sheet 10 may be smaller than the line width t of the guide mark 60. Thereby, since the plurality of openings overlap the guide mark 60, the visibility of the guide mark 60 can be improved.

In one embodiment, as shown in FIG. 2, the absorbent body 2 may include an indicator 72 that changes color upon contact with moisture. The indicator 72 is provided on the back sheet 20 so as to be visible from the non-skin side Z2 of the absorbent main body 2, and changes color when it reacts with body fluids absorbed into the absorbent core 30. As the indicator 72 changes color, the user can grasp the degree of wetness of the absorbent core 30.

As shown in FIG. 2, the indicator 72 includes a center indicator 73 placed at the center of the absorbent body 2 in the lateral direction X, and a pair of side indicators 74 placed on the outside of the center indicator 73 in the lateral direction X. include. The center indicator 73 and the pair of side indicators 74 extend linearly in the vertical direction Y. Note that the center indicator 73 and the pair of side indicators 74 may extend in the vertical direction Y in a wavy or curved manner.

The ventral end of the center indicator 73 is located ventral to the guide mark 60. The end of the center indicator 73 on the back side is arranged on the back side of the guide mark 60. That is, the center indicator 73 extends in the vertical direction Y so as to traverse the guide mark 60 . The dorsal end portions of the pair of side indicators 74 are arranged on the ventral side of the guide mark 60. Therefore, the pair of side indicators 74 are formed at positions that do not overlap the guide marks 60 when viewed from the thickness direction Z. Thereby, when the wearer puts on the diaper 1 with the buttocks of the wearer aligned with the guide marks 60, it becomes possible to visually recognize the end of the back side of the side indicator 74. By visually checking the end of the back side of the side indicator 74, it can be confirmed that the diaper 1 has been properly worn.

Furthermore, the distance between the pair of side indicators 74 in the lateral direction X may be smaller than the width W3 of the guide mark 60 in the lateral direction X. As a result, the pair of side indicators 74 are placed in the wearer's crotch area, so that the pair of side indicators 74 easily come into contact with urine during urination. Therefore, it becomes possible to easily grasp the wetness of the absorbent core 30.

As described above, the guide mark 60 is arranged on the back side of the pair of side indicators 74 from the back side ends. Note that even if the dorsal end of the center indicator 73 is arranged ventrally than the guide mark 60, and the center indicator 73 and the pair of side indicators 74 are entirely formed ventrally than the guide mark 60, good.

The indicator 72 may include a message indicator 75 that changes color when it comes into contact with moisture to display message information such as text or illustrations. The message indicator 75 is placed on the ventral side of the center indicator 73. A slight gap may be formed between the ventral side end of the center indicator 73 and the message indicator 75. As shown in FIG. 2, the distance D1 in the vertical direction Y from the transverse center line CL1 to the ventral end of the message indicator 75 is the distance D1 in the vertical direction Y from the transverse center line CL1 to the lowest point 64 of the guide mark 60. It may be longer than the distance D2. Further, the distance D1 in the vertical direction Y from the transverse center line CL1 to the ventral end of the message indicator 75 is longer than the distance D3 in the vertical direction Y from the transverse center line CL1 to the other end 63 of the guide mark 60. Good too. The portion of the guide mark 60 ventral to the lowest point 64 is deformed when the wearer closes his or her legs. By increasing the distance D1 in the vertical direction Y from the transverse center line CL1 to the ventral end of the message indicator 75, the message indicator 75 is deformed when changing the diaper 1, and the visibility of the message indicator 75 is reduced. is suppressed.

As shown in FIG. 1, the diaper 1 may further include an elastic member 40 that is stretchable in the length direction. The elastic member 40 is arranged on the outer side of the elastic member 13 in the lateral direction X. The dorsal end of the elastic member 40 is arranged in the dorsal region 51, and the ventral end of the elastic member 40 is arranged in the ventral region 52. The elastic member 40 is made of a stretchable material such as rubber or spandex that can be contracted in the length direction, and extends between the top sheet 10 and the back sheet 20 of the absorbent body 2 at the side edges of the absorbent body 2. They are arranged along the edge 2S. When the diaper 1 is worn, the elastic member 40 contracts in the vertical direction Y, so that the side edge 2S of the absorbent body 2 fits around the wearer's legs. That is, the elastic member 40 constitutes leg gathers that expand and contract around the wearer's legs. Note that the diaper 1 may include a plurality of elastic members 40. As shown in FIG. 1, the plurality of elastic members 40 are arranged in the horizontal direction X outside the elastic member 13 and extend in the vertical direction Y in parallel with each other.

As shown in FIG. 2, the guide mark 60 is located between the lowest point 64 of the guide mark 60 and the ventral edge of the fastening tab 90 (more specifically, when viewed from the thickness direction Z, the pair of flaps The imaginary line 60L connecting the side edge of the portion 15 and the ventral side edge of the pair of fastening tabs 90 may be arranged at a position where it intersects the elastic member 40. In this case, the force of pulling the fastening tabs 90 when wearing the diaper 1 is transmitted to the elastic member 40, improving the fit around the legs.

In addition, when the diaper 1 is provided with a plurality of elastic members 40, the middle point 60C between the lowest point 64 of the guide mark 60 and the ventral edge of the fastening tab 90 is the middle point of the plurality of elastic members 40. The elastic member 40 may be arranged on the inner side in the lateral direction X than the elastic member 40 arranged on the outermost side (hereinafter referred to as "outer elastic member"). The intermediate point 60C is located inside in the lateral direction may have been done. Note that the intermediate point 60C may be arranged in the lateral direction X inside the midline between the inner elastic member and the outer elastic member and outside the inner elastic member.

By arranging the guide marks 60 in the above positions, the tension applied to the fastening tabs 90 when wearing the diaper 1 is transmitted to the elastic member 40, improving the fit around the legs. 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 tab 90 can easily act on the outer elastic member. Note that a low contractile force means a low elongation magnification. The elongation magnification of the elastic member 40 is the elastic member when the absorbent main body 2 is pulled until the gathers due to contraction of the elastic member 40 disappear with respect to a sample containing one elastic member 40 cut out together with the absorbent main body 2. 40 and the natural length S2 of the elastic member 40 removed from the specimen, S1/S2.

In one embodiment, the pair of flap portions 15 may be elastic flaps separate from the absorbent main body 2. FIG. 6 is a plan view of the diaper 1B including the pair of elastic flaps 16 viewed from the skin side Z1. The absorbent main body 2 of the diaper 1B has a substantially rectangular planar shape. Each of the pair of extensible flaps 16 has a substantially trapezoidal planar shape and is joined to the absorbent main body 2 via a joint 17. The joint portion 17 is a portion where the laminated portion of the elastic flap 16 and the absorbent body 2 are joined by known means such as hot melt adhesive (HMA), sonic processing, and embossing. Note that if the joint part 17 is formed using sonic processing or embossing process that deforms the fibers and integrates the elastic flap 16 and the absorbent body 2, the rigidity of the joint part 17 increases and the twisting of the diaper 1B when worn is improved. It is possible to suppress this.

In addition, as shown in FIG. 6, when the straight line connecting the ventral side end of the joint part 17 and the lowest point 64 of the guide mark 60 is defined as the imaginary line 18, the imaginary line when viewed from the skin side Z1 Line 18 partially overlaps telescopic flap 16. More specifically, the imaginary line 18 intersects the boundary line between the absorbent main body 2 and the pair of elastic flaps 16 when viewed from the skin side Z1. Further, the virtual line 18 may overlap the fastening tab 90 when viewed from the skin side Z1.
.

By arranging the joint portion 17 and the guide mark 60 in the above-described positional relationship, when the diaper 1 is put on, a pulling force is applied starting from the position of the wearer's buttocks, so that the elastic flap can be fastened without loosening. The tab 90 can be fixed. Therefore, the diaper 1 can be made to fit the wearer.

Note that the virtual line 18 may intersect with the elastic member 40 when viewed from the skin side Z1. In this case, the tension acting on the fastening tabs 90 is easily transmitted to the elastic member 40, improving the fit around the legs.

When wearing the diaper 1 described above, the user places the wearer's buttocks in alignment with the guide marks 60. More specifically, with the wearer lying on his back, the buttock of the wearer is arranged so that the crack of the buttock is located on the connecting part 65, so that the buttock of the wearer is aligned with the two curved parts 61. Next, the abdominal region 52 of the absorbent body 2 is passed through the wearer's crotch and pulled up toward the wearer's abdomen. Then, with the ventral region 52 of the absorbent main body 2 in contact with the wearer's abdomen, the pair of fastening tabs 90 attached to the dorsal region 51 of the absorbent main body 2 are placed on the wearer's ventral side in the direction of the waist circumference. A pair of fastening tabs 90 are fixed to the outer surface of the target portion 45 by pulling. Thereby, the diaper 1 is worn so as to cover the wearer's abdomen, back, and crotch. In the diaper 1 described above, since the narrowing part 36 that is narrowed inward in the lateral direction The absorbent core 30 is less likely to interfere with the wearer's legs. Therefore, the diaper 1 is prevented from being pulled up insufficiently and the diaper 1 is prevented from slipping. Furthermore, even if the absorbent core 30 comes into contact with the wearer's legs, the diaper 1 may not be pulled up enough because the absorbent core 30 bends starting from the pair of channels 70 with low rigidity. suppressed more reliably.

Incidentally, the tape-type diaper 1 is normally distributed in a folded state and housed in a package. For example, the diaper 1 is constructed such that the pair of side sheets 12 are folded inward in the lateral direction It is housed in a package in a Y-folded state. When using the diaper 1, the user takes out the diaper 1 folded as described above from the package, unfolds the absorbent main body 2 in the vertical direction Y, and then unfolds the pair of side sheets 12 in the horizontal direction. Expand to X. Here, in the diaper 1, when the pair of side sheets 12 are folded inward in the lateral direction X, at least a portion of the guide mark 60 is formed at a position that is visible from the skin side Z1. By being able to visually recognize the guide mark 60 with the pair of side sheets 12 folded, the user can reliably recognize the presence of the guide mark 60.

Although the diaper 1 shown in FIG. 1 includes an absorbent core 30 having a pair of channel portions 70, the pair of channel portions 70 may not necessarily be formed in the absorbent core 30. Even if a pair of channel portions 70 are not formed, if a narrowed portion 36 whose width in the lateral direction X is partially narrowed is formed in the absorbent core 30 on the ventral side of the guide mark 60, the Since the sexual core 30 is less likely to interfere with the wearer's legs, displacement of the diaper 1 can be suppressed.

Note that, as long as the pair of channel portions 70 are formed in the absorbent core 30, the absorbent core 30 does not need to be constricted at a position on the ventral side of the guide mark 60. Hereinafter, a diaper 1A according to another embodiment will be described with reference to FIG. 5. Below, the differences between the diaper 1A shown in FIG. 1 will be mainly explained, and redundant explanation will be omitted.

The diaper 1A shown in FIG. 5 includes an absorbent core 30A instead of the absorbent core 30. The absorbent core 30A differs from the absorbent core 30 in that it has a substantially constant width throughout the lengthwise direction Y. A pair of channel portions 70A are formed in the absorbent core 30A. The pair of channel portions 70A are arranged symmetrically with respect to the longitudinal centerline CW of the absorbent main body 2. The basis weight of the pair of channel portions 70A is set lower than the basis weight of other portions of the absorbent core 30A. In one embodiment, the pair of channel portions 70A may be slits having a basis weight of zero.

The pair of channel portions 70A extend in a curved manner in the vertical direction Y. Note that the pair of channel portions 70A may extend linearly in the vertical direction Y. The pair of channel portions 70 extend vertically across the guide mark 60. More specifically, the dorsal end portions 70R of the pair of channel portions 70A are disposed dorsal to the guide mark 60, and the ventral end portions 70F of the pair of channel portions 70A are disposed dorsal to the guide mark 60. placed on the side. Therefore, a portion of the pair of channel portions 70 is formed on the ventral side of the guide mark 60.

Here, the length of the portion of the pair of channel portions 70A on the ventral side of the guide mark 60 is longer than the length of the portion of the pair of channel portions 70A on the dorsal side of the guide mark 60. That is, most of the pair of channel portions 70 are disposed on the ventral side of the guide mark 60. In the diaper 1A described above, the pair of channel portions 70A are formed on the ventral side of the guide mark 60, so that when the ventral region 52 of the absorbent main body 2 is pulled up toward the ventral side of the wearer, the pair of absorbent cores 30 It can be easily bent starting from the channel portion 70A. Therefore, the absorbent core 30 is less likely to interfere with the wearer's legs, and the diaper 1 is prevented from being pulled up insufficiently.

Although diapers according to various embodiments have been described above, the present invention is not limited to the embodiments described above, and various modifications can be made without changing the gist of the invention. That is, it should be noted that the above-described embodiments are for illustrative purposes only and do not limit the scope of the present invention. The various embodiments described above can be combined without contradiction.

The present invention will be described with reference to the provisions listed below. Note that the present invention may include the following clauses in any combination without specific enumeration.

1. A diaper extending in a vertical direction connecting the wearer's ventral side to the dorsal side and in a horizontal direction perpendicular to the vertical direction,
A top sheet placed on the wearer's skin side, a back sheet placed on the non-skin side opposite to the skin side, and a top sheet placed between the top sheet and the back sheet. an absorbent body including an absorbent core;
a pair of fastening tabs extending outward in the lateral direction from the absorbent main body;
Equipped with
A guide mark is formed on the absorbent main body so as to be visible from the skin side, which guides the position where the wearer's buttocks should be placed;
In the diaper, the absorbent core is at least partially constricted inward in the lateral direction at a position on the ventral side of the guide mark.

2. The absorbent core has a pair of channel portions that are formed symmetrically with respect to a longitudinal centerline passing through the center of the absorbent main body in the lateral direction, and have a lower basis weight than other portions of the absorbent core. ,
The diaper according to clause 1, wherein at least a portion of the pair of channel portions is disposed on the ventral side of the guide mark.

3. The absorbent core includes a constricted region having a narrower width in the lateral direction than the dorsal end of the absorbent core,
The diaper according to

clause

1 or 2, wherein the guide mark is arranged at a position overlapping the constriction region when viewed from the skin surface side.

4. According to any one of clauses 1 to 3, the area of the ventral side of the guide mark in the constriction area is larger than the area of the part of the constriction area on the dorsal side of the guide mark. Diaper as described.

5. The absorbent body has an indicator extending in the longitudinal direction and changing color when reacting with bodily fluids of the wearer,
5. The diaper according to any one of clauses 1 to 4, wherein the guide mark is arranged on the back side of the indicator.

6. The top sheet includes a center sheet that covers the absorbent core, and a pair of side sheets that cover both sides of the center sheet in the lateral direction,
The pair of side sheets includes a dorsal side fixing part fixed to the center sheet on the dorsal side of the transverse center line passing through the longitudinal center of the absorbent main body,
Any one of clauses 1 to 5, wherein in the longitudinal direction, the guide mark is disposed on the ventral side of the midline between the ventral end of the dorsal fixation part and the transverse center line. Diapers as described in section.

7. The diaper according to any one of clauses 1 to 6, wherein the guide mark has a shape imitating the shape of a buttocks.

8. The diaper according to any one of clauses 1 to 7, wherein the guide mark includes two curved parts that are convex toward the ventral side.

9. The guide mark includes a connecting part in which one ends of the two curved parts are connected to each other,
9. The diaper according to any one of clauses 1 to 8, wherein the connecting portion is arranged on a longitudinal centerline passing through the center of the absorbent main body in the lateral direction.

10. The diaper according to any one of clauses 1 to 9, wherein the other ends of the two curved parts are arranged on the back side of the connecting part.

11. When the part of the two curved parts that protrudes most toward the ventral side is the lowest point, an imaginary connecting the lowest point and one end of the two curves with respect to a reference line parallel to the lateral direction. According to any one of clauses 1 to 10, the first angle formed by the line is larger than the second angle formed by an imaginary line connecting the lowest point and the other ends of the two curves with respect to the reference line. Diaper as described.

12. The diaper according to any one of clauses 1 to 11, wherein the line width of the two curved parts is 0.3% or more and 3.5% or less with respect to the total length of the absorbent main body in the longitudinal direction.

13. The diaper according to any one of clauses 1 to 12, wherein the width of the guide mark in the horizontal direction is larger than the width of the guide mark in the vertical direction.

14. The absorbent main body includes a pair of upright leak-proof gathers arranged on the outer side of the absorbent core in the lateral direction,
When the pair of leakage prevention gathers are in an upright state, the other ends of the two curved parts of the guide mark are exposed, and when the pair of leakage prevention gathers are in a non-upright state, the two curved parts of the guide mark are exposed. 14. The diaper according to any one of clauses 1 to 13, wherein the other end of the curved portion is covered by the pair of leak-proof gathers.

15. The pair of channel portions extend from a position on the ventral side of the guide mark to a position on the dorsal side of the guide mark,
Any one of clauses 1 to 14, wherein the length of the ventral side of the pair of channel parts is longer than the length of the dorsal side of the guide mark of the pair of channel parts. The diaper described in paragraph 1.

16. The diaper according to any one of clauses 1 to 15, wherein the width of the guide mark in the lateral direction is larger than the distance between the pair of channel parts in the lateral direction.

17. The diaper according to any one of clauses 1 to 16, wherein the dorsal end portions of the pair of channel portions are arranged on the ventral side of the guide mark.

18. The absorbent core includes an embossed part that is textured,
18. The diaper according to any one of clauses 1 to 17, wherein the guide mark is arranged at a position overlapping the embossed portion when viewed from the skin side.

19. The diaper according to any one of clauses 1 to 18, wherein the guide mark is printed on a sheet material disposed between the top sheet and the absorbent core.

20. The diaper according to any one of clauses 1 to 19, wherein the sheet material is a tissue containing pulp.

21. The diaper according to any one of clauses 1 to 20, wherein the guide mark is printed on the non-skin side surface of the sheet material.

22. The skin-side surface and the non-skin-side surface of the sheet material are respectively adhered to the topsheet or the absorbent core with a hot melt adhesive, according to any one of Clauses 1 to 21. Diaper as described.

23. According to any one of clauses 1 to 22, at least a part of the guide mark is formed in a position that is visible from the skin side when the side sheet is folded inward in the lateral direction. Diapers.

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

25. A diaper extending in a vertical direction connecting the wearer's ventral side to the dorsal side and in a horizontal direction perpendicular to the vertical direction,
A top sheet placed on the skin side of the wearer, a back sheet placed on the non-skin side of the wearer, and an absorbent core placed between the top sheet and the back sheet. an absorbent body including;
a pair of fastening tabs extending outward in the lateral direction from the absorbent main body;
Equipped with
A guide mark is formed on the absorbent main body so as to be visible from the skin side, which guides the position where the wearer's buttocks should be placed;
The absorbent core has a pair of channel portions that are formed symmetrically with respect to a longitudinal centerline passing through the center of the absorbent main body in the lateral direction, and have a lower basis weight than other portions of the absorbent core. ,
In the diaper, at least a portion of the pair of channel portions are arranged on the ventral side of the guide mark.

26. The diaper according to clause 25, wherein the absorbent core is at least partially constricted inward in the lateral direction at a position on the ventral side of the guide mark.

27. A diaper extending in a vertical direction connecting the wearer's ventral side to the dorsal side and in a horizontal direction perpendicular to the vertical direction,
A top sheet placed on the wearer's skin side, a back sheet placed on the non-skin side opposite to the skin side, and a top sheet placed between the top sheet and the back sheet. an absorbent body including an absorbent core;
a pair of fastening tabs extending outward in the lateral direction from the absorbent main body;
an elastic member disposed along both ends of the absorbent body in the horizontal direction and expandable and contractible in the vertical direction;
Equipped with
A guide mark is formed on the absorbent main body so as to be visible from the skin side, which guides the position where the wearer's buttocks should be placed;
When viewed from the skin surface side, an imaginary line connecting the ventral side edge of the guide mark and the ventral side edge of the pair of fastening tabs intersects the elastic member.

28. A diaper extending in a vertical direction connecting the wearer's ventral side to the dorsal side and in a horizontal direction perpendicular to the vertical direction,
A top sheet placed on the wearer's skin side, a back sheet placed on the non-skin side opposite to the skin side, and a top sheet placed between the top sheet and the back sheet. an absorbent body including an absorbent core;
a pair of elastic flaps extending outward in the lateral direction from the absorbent body;
a pair of fastening tabs attached to the pair of elastic flaps;
Equipped with
A guide mark is formed on the absorbent main body so as to be visible from the skin side, which guides the position where the wearer's buttocks should be placed;
the pair of elastic flaps are joined to the absorbent main body via a joint,
When viewed from the skin surface side, an imaginary line connecting the ventral side edge of the guide mark and the ventral side edge of the joint portion partially overlaps the pair of elastic flaps.

29. A diaper extending in a vertical direction connecting the wearer's ventral side to the dorsal side and in a horizontal direction perpendicular to the vertical direction,
A top sheet placed on the wearer's skin side, a back sheet placed on the non-skin side opposite to the skin side, and a top sheet placed between the top sheet and the back sheet. an absorbent body including an absorbent core;
a pair of fastening tabs extending outward in the lateral direction from the absorbent main body;
Equipped with
A guide mark is formed on the absorbent main body so as to be visible from the skin side, which guides the position where the wearer's buttocks should be placed;
The absorbent main body includes a center indicator that extends in the longitudinal direction and changes color by reacting with the wearer's body fluid, and a center indicator that is disposed on the ventral side of the center indicator and changes color by reacting with the wearer's body fluid. a message indicator for displaying message information;
In the longitudinal direction, a distance from a transverse centerline passing through the longitudinal center of the absorbent body to the ventral end of the message indicator is longer than a distance from the transverse centerline to a guide mark. Diapers.

1, 1A... Diaper, 10... Top sheet, 11... Center sheet, 12... Side sheet, 20... Back sheet, 30, 30A... Absorbent core, 43... Constriction area, 55... Sheet material, 60... Guide mark, 61 ...Curved part, 62...One end, 63...Other end, 64...Lowest point, 65...Connection part, 66...Reference line, 67, 68...Virtual line, 70, 70A...Channel part, 72...Indicator, 80...Prevention Leakage gather, 84...Dorsal fixing part, 90...Fastening tab, CL1...Transverse center line, CW...Vertical center line, X...Horizontal direction, Y...Longitudinal direction, Z1...Skin side, Z2...Non-skin side, θ1...first angle, θ2...second angle.

Claims

A diaper extending in a vertical direction connecting the wearer's ventral side to the dorsal side and in a horizontal direction perpendicular to the vertical direction,
A top sheet placed on the wearer's skin side, a back sheet placed on the non-skin side opposite to the skin side, and a top sheet placed between the top sheet and the back sheet. an absorbent body including an absorbent core;
a pair of fastening tabs extending outward in the lateral direction from the absorbent main body;
Equipped with
A guide mark is formed on the absorbent main body so as to be visible from the skin side, which guides the position where the wearer's buttocks should be placed;
In the diaper, the absorbent core is at least partially constricted inward in the lateral direction at a position on the ventral side of the guide mark.
The absorbent core has a pair of channel portions that are formed symmetrically with respect to a longitudinal centerline passing through the center of the absorbent main body in the lateral direction, and have a lower basis weight than other portions of the absorbent core. ,
The diaper according to claim 1, wherein at least a portion of the pair of channel portions are arranged on the ventral side of the guide mark.
The absorbent core includes a constricted region having a narrower width in the lateral direction than the dorsal end of the absorbent core,
The diaper according to claim 1, wherein the guide mark is arranged at a position overlapping the constriction region when viewed from the skin side.
The diaper according to claim 3, wherein the area of a portion of the constriction region on the ventral side of the guide mark is larger than the area of the portion of the constriction region on the dorsal side of the guide mark.
The absorbent body has an indicator extending in the longitudinal direction and changing color when reacting with bodily fluids of the wearer,
The diaper according to claim 1, wherein the guide mark is arranged closer to the back than the end of the back of the indicator.
The top sheet includes a center sheet that covers the absorbent core, and a pair of side sheets that cover both sides of the center sheet in the lateral direction,
The pair of side sheets includes a dorsal side fixing part fixed to the center sheet on the dorsal side of the transverse center line passing through the longitudinal center of the absorbent main body,
The diaper according to claim 1, wherein in the longitudinal direction, the guide mark is disposed closer to the ventral side than a midline between the ventral end of the dorsal side fixing part and the transverse center line.
The diaper according to claim 1, wherein the guide mark has a shape imitating the shape of a buttocks.
The diaper according to claim 1, wherein the guide mark includes two curved parts that are convex toward the ventral side.
The guide mark includes a connecting part in which one ends of the two curved parts are connected to each other,
The diaper according to claim 8, wherein the connecting portion is arranged on a longitudinal centerline passing through the center of the absorbent main body in the lateral direction.
The diaper according to claim 9, wherein the other ends of the two curved parts are arranged on the back side of the connecting part.
An imaginary line connecting the lowest point and one end of the two curved lines with respect to a reference line parallel to the lateral direction, when the lowest point is the part of the two curved parts that most protrudes toward the ventral side. The diaper according to claim 10, wherein the first angle formed by the line is larger than the second angle formed by a virtual line connecting the lowest point and the other ends of the two curves with respect to the reference line.
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 total length of the absorbent main body in the longitudinal direction.
The diaper according to claim 1, wherein the width of the guide mark in the horizontal direction is larger than the width of the guide mark in the vertical direction.
The absorbent main body includes a pair of upright leak-proof gathers arranged on the outer side of the absorbent core in the lateral direction,
When the pair of leakage prevention gathers are in an upright state, the other ends of the two curved parts of the guide mark are exposed, and when the pair of leakage prevention gathers are in a non-upright state, the two curved parts of the guide mark are exposed. The diaper according to claim 10, wherein the other end of the curved portion is covered by the pair of leak-proof gathers.
The pair of channel portions extend from a position on the ventral side of the guide mark to a position on the dorsal side of the guide mark,
The diaper according to claim 2, wherein the length of the ventral side of the pair of channel parts is longer than the length of the dorsal side of the guide mark of the pair of channel parts. .
The diaper according to claim 15, wherein the width of the guide mark in the lateral direction is larger than the distance between the pair of channel parts in the lateral direction.
The diaper according to claim 2, wherein the dorsal end portions of the pair of channel portions are located closer to the ventral side than the guide mark.
The absorbent core includes an embossed part that is textured,
The diaper according to claim 1, wherein the guide mark is arranged at a position overlapping the embossed portion when viewed from the skin side.
The diaper according to claim 1, wherein the guide mark is printed on a sheet material disposed between the top sheet and the absorbent core.
The diaper according to claim 19, wherein the sheet material is a tissue containing pulp.
The diaper according to claim 19, wherein the guide mark is printed on the non-skin side surface of the sheet material.
The diaper according to claim 19, wherein the skin-side surface and the non-skin-side surface of the sheet material are respectively adhered to the topsheet or the absorbent core with a hot melt adhesive.
The diaper according to claim 6, wherein at least a portion of the guide mark is formed at a position that is visible from the skin side when the side sheet is folded inward in the lateral direction.
The diaper according to claim 1, wherein the guide mark is printed in a color included in the range of 5GY to 10RP on the Munsell color wheel.
A diaper extending in a vertical direction connecting the wearer's ventral side to the dorsal side and in a horizontal direction perpendicular to the vertical direction,
A top sheet placed on the skin side of the wearer, a back sheet placed on the non-skin side of the wearer, and an absorbent core placed between the top sheet and the back sheet. an absorbent body including;
a pair of fastening tabs extending outward in the lateral direction from the absorbent main body;
Equipped with
A guide mark is formed on the absorbent main body so as to be visible from the skin side, which guides the position where the wearer's buttocks should be placed;
The absorbent core has a pair of channel portions that are formed symmetrically with respect to a longitudinal centerline passing through the center of the absorbent main body in the lateral direction, and have a lower basis weight than other portions of the absorbent core. ,
In the diaper, at least a portion of the pair of channel portions are arranged on the ventral side of the guide mark.
The diaper according to claim 25, wherein the absorbent core is at least partially constricted inward in the lateral direction at a position on the ventral side of the guide mark.