Absorbent articles

Abstract

To prevent an absorbent core from losing a shape.SOLUTION: An absorbent article includes: an absorber; a cover sheet; and a plurality of first, second elastic members arranged in an extended state. The absorber has: an absorbent core which has an abdominal part, a first widening part narrower than the abdominal part in a width direction orthogonal to a longitudinal direction, a crotch part narrower than the first widening part in the width direction, a second widening part wider than the crotch part in the width direction, and a back part wider than the second widening part in the width direction in the longitudinal direction in this order; and a core wrap sheet which covers the absorbent core and is wider than the first widening part and the second widening part in the width direction. At least one of both end parts of at least one first elastic member extends in the width direction and superimposed on the core wrap sheet in a thickness direction of the absorber and outside in the width direction of the first widening part; at least one of both end parts of at least one second elastic member extends in the width direction and is superimposed on the core wrap sheet in the thickness direction outside in the width direction of the second widening part.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to absorbent articles.

Background Art

[0002] Diapers, which are absorbent articles, are known to incorporate an absorber for absorbing excretory fluids (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The absorber incorporates a mat - shaped absorption core composed of a superabsorbent polymer and pulp fibers. An elastic member for closely attaching the diaper to the wearer's skin surface is disposed around the absorber. When the elastic member near the absorption core repeatedly expands and contracts during diaper wear, there is a risk that the absorption core will lose its shape. If the absorption core loses its shape, the absorption function deteriorates.

[0005] An object of the present invention is to provide an absorbent article in which the absorption core is unlikely to lose its shape even when the elastic member repeatedly expands and contracts.

Means for Solving the Problems

[0006] The present invention relates to an absorbent article worn by a wearer, comprising: an absorbent body positioned so as to follow the longitudinal direction of the wearer in the front-to-back direction; a cover sheet positioned on the non-skin side of the absorbent body and forming the outer surface of the absorbent article; and a plurality of stretchable members positioned in an extended state, wherein the absorbent body has an absorbent core having, in this order along the longitudinal direction, an abdominal area, a first widened portion narrower than the abdominal area in the width direction perpendicular to the longitudinal direction, a crotch area narrower than the first widened portion in the width direction, a second widened portion wider than the crotch area in the width direction, and a back area wider than the second widened portion in the width direction, and covering the absorbent core, in the width direction The absorbent article comprises a core wrap sheet wider than the first widening portion and the second widening portion, wherein the plurality of expandable members include a plurality of first expandable members and a plurality of second expandable members, wherein at least one of the ends of at least one of the plurality of first expandable members extends in the width direction and overlaps the core wrap sheet and the absorbent in the thickness direction on the outside of the first widening portion in the width direction, and at least one of the ends of at least one of the plurality of second expandable members extends in the width direction and overlaps the core wrap sheet and the absorbent in the thickness direction on the outside of the second widening portion in the width direction.

[0007] The plurality of first and second expandable members do not necessarily have to overlap the absorbent core in the thickness direction.

[0008] At least one of the ends of one or two of the plurality of first expandable members extends in the width direction and overlaps the core wrap sheet in the thickness direction outside the boundary between the first expandable portion and the crotch area in the first expandable portion in the width direction, and at least one of the ends of one or two of the plurality of second expandable members extends in the width direction and overlaps the core wrap sheet in the thickness direction outside the boundary between the second expandable portion and the crotch area in the second expandable portion in the width direction That's good too.

[0009] The first widening portion has a first region located on the side closer to the crotch and a second region located on the side closer to the abdomen, and the second widening portion has a third region located on the side closer to the crotch and a fourth region located on the side closer to the back, and at least one of the ends of all or more of the first stretchable members extends in the width direction and overlaps with the core wrap sheet in the thickness direction on the outside of the width direction of the first region, and at least one of the ends of all or more of the second stretchable members extends in the width direction and overlaps with the core wrap sheet in the thickness direction on the outside of the width direction of the third region.

[0010] At least one of the ends of one or two of the plurality of first expandable members extends in the width direction and overlaps the core wrap sheet in the thickness direction outside the width direction of the boundary between the first region and the second region, and at least one of the ends of one or two of the plurality of second expandable members extends in the width direction and overlaps the core wrap sheet in the thickness direction outside the width direction of the boundary between the third region and the fourth region.

[0011] The plurality of first expandable members may be arranged such that the entire area of ​​the first region in the longitudinal direction is pulled outward in the width direction of the first region, and the plurality of second expandable members may be arranged such that the entire area of ​​the second region in the longitudinal direction is pulled outward in the width direction of the second region.

[0012] At least one of the plurality of first expandable members may have all or half of its portion extending in the width direction and overlapping the core wrap sheet in the thickness direction on the outside of the first widening portion in the width direction, and at least one of the plurality of second expandable members may have all or half of its portion extending in the width direction and overlapping the core wrap sheet in the thickness direction on the outside of the second widening portion in the width direction.

[0013] All or more of one of the plurality of first expandable members may extend in the width direction and overlap the core wrap sheet in the thickness direction on the outside of the width direction of the first region, and all or more of one of the plurality of second expandable members may extend in the width direction and overlap the core wrap sheet in the thickness direction on the outside of the width direction of the third region.

[0014] The portion of at least one of the plurality of first expandable members that does not overlap with the core wrap sheet and the portion of at least one of the plurality of second expandable members that does not overlap with the core wrap sheet are adhered to the cover sheet and may extend along the leg openings provided in the cover sheet.

[0015] The plurality of first expandable members may be arranged such that the entire first widening portion in the longitudinal direction is pulled outward in the width direction of the first widening portion, and the plurality of second expandable members may be arranged such that the entire second widening portion in the longitudinal direction is pulled outward in the width direction of the second widening portion.

[0016] The portions of the plurality of first expandable members that overlap with the core wrap sheet may contract in the width direction, and the portions of the plurality of second expandable members that overlap with the core wrap sheet may also contract in the width direction.

[0017] The portions of the plurality of first expandable members that do not overlap with the core wrap sheet and the portions of the plurality of second expandable members that do not overlap with the core wrap sheet are adhered to the cover sheet and may extend along at least one of the width direction and a direction oblique to the width direction.

[0018] The portions of the plurality of first expandable members that do not overlap with the core wrap sheet and the portions of the plurality of second expandable members that do not overlap with the core wrap sheet are adhered to the cover sheet and have portions that extend along the width direction and portions that extend diagonally with respect to the width direction. The angle between the portion of the plurality of first expandable members that does not overlap with the core wrap sheet and the portion that extends diagonally is 115 degrees or more and 145 degrees or less. The angle between the portion of the plurality of second expandable members that does not overlap with the core wrap sheet and the portion that extends diagonally is 115 degrees or more and 145 degrees or less.

[0019] Any of the plurality of expandable members may be positioned on the outer side of the crotch area in the width direction near the boundary between the crotch area and the second widening portion.

[0020] The plurality of expandable members further include one or more third expandable members, at least one of the ends of each third expandable member may extend in the width direction and overlap the core wrap sheet in the thickness direction on the outside of the crotch area in the width direction near the boundary between the first widening portion and the crotch area.

[0021] The plurality of third expandable members do not necessarily have to overlap the absorbing core in the thickness direction.

[0022] All or more of each of the third expandable members may extend in the width direction and overlap the core wrap sheet in the thickness direction on the outside of the crotch area in the width direction near the boundary between the first widening portion and the crotch area.

[0023] The portion of each of the third expandable members that overlaps with the core wrap sheet may shrink in the width direction.

[0024] The portion of each of the third telescopic members that does not overlap with the core wrap sheet is adhered to the cover sheet and may extend along the leg opening provided in the cover sheet.

[0025] The portion of each of the third telescopic members that does not overlap with the core wrap sheet is adhered to the cover sheet and may extend in at least one of the width direction and the diagonal direction with respect to the width direction.

[0026] The portion of each of the third telescopic members that does not overlap with the core wrap sheet is adhered to the cover sheet and has a portion extending along the width direction and a portion extending in the diagonal direction with respect to the width direction. The angle formed by the portion extending along the width direction and the portion extending in the diagonal direction of the portion of each of the third telescopic members that does not overlap with the core wrap sheet may be 115 degrees or more and 145 degrees or less.

[0027] The longitudinal interval between the plurality of first telescopic members may be 5 mm or more, and the longitudinal interval between the plurality of second telescopic members may be 5 mm or more.

[0028] The longitudinal interval between the plurality of third telescopic members may be 5 mm or more.

[0029] The plurality of expandable members further include one or more fourth expandable members extending in the width direction and one or more fifth expandable members extending in the width direction, wherein the abdomen has an end located on the opposite side of the boundary between the abdomen and the first widening portion in the longitudinal direction, and the back has an end located on the opposite side of the boundary between the back and the second widening portion in the longitudinal direction, the central portion of each fourth expandable member is arranged to overlap with the end of the abdomen in the thickness direction, the portion of each fourth expandable member other than the central portion is arranged outside the end of the abdomen in the width direction, the central portion of each fifth expandable member is arranged to overlap with the end of the back in the thickness direction, and the portion of each fifth expandable member other than the central portion may be arranged outside the end of the back in the width direction.

[0030] The plurality of expandable members further include one or more sixth expandable members extending in the width direction and one or more seventh expandable members extending in the width direction, wherein the abdomen has an end located opposite the boundary between the abdomen and the first widening portion in the longitudinal direction, and the back has an end located opposite the boundary between the back and the second widening portion in the longitudinal direction, and each of the sixth expandable members may not overlap with the absorbent in the thickness direction and be positioned outside the end of the abdomen in the width direction, and each of the seventh expandable members may not overlap with the absorbent in the thickness direction and be positioned outside the end of the back in the width direction.

[0031] The plurality of second expandable members may overlap the absorption core in the thickness direction in the second widening portion.

[0032] The absorbent article described above comprises an inner body containing the absorbent, an outer body containing the cover sheet, and an adhesive portion for bonding the inner body and the outer body, the adhesive portion having a plurality of linear adhesive portions that extend in the width direction and are spaced apart from each other in the longitudinal direction, wherein each of the plurality of linear adhesive portions does not have to overlap with the plurality of second expandable members in the thickness direction.

[0033] The absorbent article described above comprises an inner body containing the absorbent material and an outer body containing the cover sheet, wherein the plurality of first expandable members overlap with the absorbent core in the thickness direction at the first widening portion, and a non-adhesive region is provided in the region where the plurality of first expandable members and the absorbent core overlap, in which the inner body and the outer body are not adhered. [Effects of the Invention]

[0034] According to the present invention, it is possible to provide a diaper in which the absorbent core is less likely to lose its shape. [Brief explanation of the drawing]

[0035] [Figure 1] Figure 1 is a perspective view of the diaper according to Embodiment 1. [Figure 2] Figure 2 is an exploded perspective view of the diaper according to Embodiment 1. [Figure 3] Figure 3 is a schematic diagram showing the diaper according to Embodiment 1 in an unfolded and extended state. [Figure 4] Figure 4 is a schematic diagram showing the diaper according to Embodiment 1 in an unfolded and extended state. [Figure 5] Figure 5 is a magnified view of the absorbent material and the surrounding cover sheet. [Figure 6] Figure 6 is an enlarged view of the absorbent material and the surrounding cover sheet. [Figure 7] Figure 7 is an enlarged view of the absorbent material and the surrounding cover sheet. [Figure 8] Figure 8 is an enlarged view of the absorbent material and the surrounding cover sheet. [Figure 9] Figure 9 is a magnified view of the cover sheet. [Figure 10] Figure 10 is a table showing the results of the sensory evaluation. [Figure 11] Figure 11 is an enlarged view of the absorbent material and the surrounding cover sheet. [Figure 12] Figure 12 is a schematic diagram showing the diaper according to Embodiment 2 in an unfolded and extended state. [Figure 13] Figure 13 is a schematic diagram showing the diaper according to Embodiment 2 in an unfolded and extended state. [Figure 14] Figure 14 is an exploded perspective view of the diaper according to Embodiment 3. [Modes for carrying out the invention]

[0036] The following describes a diaper according to an embodiment of the present invention with reference to the drawings. Note that the configurations of the following embodiments are illustrative, and the present invention is not limited to these embodiments.

[0037] <Embodiment 1> Figure 1 is a perspective view of an adult disposable pant-type diaper (hereinafter simply referred to as "diaper") according to Embodiment 1. In the diaper, the direction connecting the front panel, which is positioned opposite the wearer's abdomen, and the back panel, which is positioned opposite the wearer's back, is defined as the longitudinal direction. Between these front panel (one side in the longitudinal direction) and back panel (the other side in the longitudinal direction) (in the center in the longitudinal direction) lies the inseam section, which is positioned between the wearer's legs (opposite the crotch). Furthermore, when the diaper is worn by the wearer, the side facing the wearer's skin is defined as the skin side, and the side opposite the skin side is defined as the non-skin side. In addition, the direction connecting the skin side and the non-skin side is defined as the thickness direction, and the direction perpendicular to both the longitudinal direction and the thickness direction is defined as the width direction. Moreover, viewing from the thickness direction is defined as a plan view. Diaper 1 has a length along the longitudinal direction and a width along the width direction perpendicular to the longitudinal direction, and is worn between the wearer's legs. Furthermore, the terms relating to direction used in this application shall mean the directions that correspond to the front, back, left, and right of the wearer when diaper 1 is worn by the wearer. For example, when referring to the left and right directions in this application, it means the directions that correspond to the left and right of the wearer when diaper 1 is worn by the wearer.

[0038] In this embodiment, as an example of an absorbent article, a pant-type disposable diaper with a tubular structure having an opening for the wearer's waist circumference and a pair of left and right openings through which the wearer's left and right lower limbs are inserted is given as an example. However, the term "absorbent article" as used in this application is not limited to adult pant-type disposable diapers. The term "absorbent article" as used in this application includes children's pant-type disposable diapers. Furthermore, it includes various forms of absorbent articles that can enclose the waist circumference and crotch, such as tape-type disposable diapers that form a tubular structure by attaching a tape, fixed near one end of a sheet-like member that covers the wearer's crotch (genitals) from the front to the back, to the other end of the sheet-like member.

[0039] Diaper 1 has a crotch region 1B, which is the part that covers the wearer's genitals (crotch) when worn; a front body region 1F, which is the part that covers the wearer's abdomen and is the part that covers the wearer's torso; and a back body region 1R, which is the part that covers the wearer's back and is the part that covers the wearer's back and is the part that covers the wearer's torso. Here, the front body region 1F is located in front of the crotch region 1B, and the back body region 1R is located behind the crotch region 1B. In this embodiment, since diaper 1 is a pant-type disposable diaper, the left edge of the front body region 1F and the left edge of the back body region 1R are joined to each other, and the right edge of the front body region 1F and the right edge of the back body region 1R are joined to each other. Therefore, a torso opening 2T is formed in diaper 1 by the upper edge of the front body region 1F and the upper edge of the back body region 1R. Furthermore, diaper 1 has a left lower limb opening 2L formed on the left side of the crotch area 1B where the above-mentioned joint is not made, and a right lower limb opening 2R formed on the right side of the crotch area 1B. The wearer's left lower limb is inserted through the left lower limb opening 2L, and the wearer's right lower limb is inserted through the right lower limb opening When inserted through 2R and worn so that the wearer's torso enters the torso opening 2T, the front body region 1F is positioned on the wearer's abdominal side, the back body region 1R is positioned on the wearer's back side, and the left lower limb opening 2L and the right lower limb opening 2R are fixed to the wearer's body, surrounding the wearer's thighs. Since the diaper 1 is fixed to the wearer's body in this manner, the wearer can move freely while wearing the diaper 1.

[0040] Diaper 1 has an absorbent material that can absorb and retain liquids, mainly located around the crotch area 1B. In addition, to prevent the formation of gaps between diaper 1 and the wearer's skin that could become pathways for liquid leakage, diaper 1 is provided with a three-dimensional gather 3BL at the left leg opening 2L surrounding the thigh of the wearer's left leg, a three-dimensional gather 3BR at the right leg opening 2R surrounding the thigh of the wearer's right leg, and a waist gather 3R around the wearer's waist. In addition, leg gathers 3LL and 3LR are provided around the base of the wearer's legs. The three-dimensional gathers 3BL and 3BR and the waist gather 3R adhere closely to the wearer's skin due to the elastic force of the elastic thread. The leg gathers 3LL and 3LR prevent gaps from forming between the base of the wearer's legs and diaper 1. Therefore, the discharge from the wearer's genitals is absorbed into the absorbent material of diaper 1 with almost no leakage.

[0041] Diaper 1 can be used in combination with an inner pad (not shown). The inner pad is a roughly rectangular absorbent article equipped with an absorbent material that absorbs wastewater. When using diaper 1 and the inner pad together, the inner pad is placed on the skin-facing side of diaper 1 so as to be in contact with the wearer's urinary tract. Wastewater is first absorbed by the inner pad, and only the wastewater that could not be absorbed by the inner pad reaches the absorbent material of diaper 1 and is further absorbed. Therefore, even if the amount of wastewater is large, leakage from diaper 1 can be prevented. Also, if the amount of wastewater is small and can be fully absorbed by the inner pad, only the inner pad needs to be replaced when wastewater occurs, thus reducing care costs. Furthermore, diaper 1 can be used for extended periods.

[0042] Figure 2 is an exploded perspective view of diaper 1 according to Embodiment 1. Diaper 1 has a cover sheet 4 and an inner cover sheet 5. The cover sheet 4 and the inner cover sheet 5 are sheets that are bonded together to form the outer surface of diaper 1 and are roughly hourglass-shaped (gourd-shaped), and are the same shape except for the ends on the front body region 1F side and the ends on the back body region 1R side. When worn by a person, the cover sheet 4 is laminated on the side that does not touch the wearer's skin, and the inner cover sheet 5 is laminated on the side that touches the wearer. Between the cover sheet 4 and the inner cover sheet 5, elastic threads are provided to form waist gathers 3R and leg gathers 3LL, 3LR. Note that an elastic material such as a strip of elastic can be appropriately selected instead of the elastic threads.

[0043] The cover sheet 4 and inner cover sheet 5 can be made of a nonwoven fabric made of a liquid-impermeable thermoplastic resin, for example, to suppress leakage of excrement. Examples of liquid-impermeable thermoplastic resins include polyethylene (PE) and polypropylene (PP). Hereinafter, the cover sheet 4 and inner cover sheet 5, which have elastic threads arranged on them, are sometimes referred to as the outer casing, as a concept corresponding to the absorbent body 8 and the absorbent body 8 combined with the back sheet 6, top sheet 9, and side sheets 10L and 10R.

[0044] Diaper 1 has a back sheet 6, an absorbent body 8, and a top sheet 9, which are sequentially laminated on the wearer-side surfaces of the cover sheet 4 and the inner cover sheet 5. The back sheet 6 is a roughly rectangular sheet with a length in the longitudinal direction that extends from the wearer's front body through the crotch to the back body, and a predetermined width in the width direction perpendicular to the longitudinal direction. The absorbent body 8 and the top sheet 9 are both sheet-like members having a roughly rectangular appearance, similar to the back sheet 6. The sheets are stacked sequentially on the backsheet 6, with their longitudinal directions coinciding with the longitudinal direction of the backsheet 6. The backsheet 6 is a sheet made of a liquid-impermeable thermoplastic resin to suppress leakage of excrement. The top sheet 9 is a sheet-like member positioned on the skin side of the wearer so as to cover the absorbent surface of the absorbent body 8. This top sheet 9 is liquid-permeable in part or all of its structure. Therefore, when the diaper 1 is worn, liquid excreted by the wearer penetrates the absorbent body 8 through the top sheet 9, which can come into contact with the wearer's skin, and is absorbed there. Examples of liquid-permeable sheets include woven fabrics, nonwoven fabrics, and porous films. The top sheet 9 may also be hydrophilic.

[0045] The absorbent body 8 comprises an absorbent core 8c and a core wrap sheet 7 that encloses the absorbent core 8c. The absorbent core 8c is roughly hourglass-shaped with a constricted portion. The absorbent core 8c has a structure in which granular absorbent resin (super absorbent polymer), such as SAP (Super Absorbent Polymer), a hydrophilic polymer with a cross-linked structure capable of absorbing and retaining water, is held in the gaps between short fibers of cellulosic fibers such as pulp fibers, rayon fibers, or cotton fibers, or synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate that have been treated to be hydrophilic. When the absorbent core 8c absorbs liquid excreted from the wearer, it swells the absorbent resin held in the gaps between the short fibers, thereby retaining the liquid within the short fibers. In this embodiment, the absorbent core 8c is hourglass-shaped with a constriction near the center. The absorbent core 8c can take on an appropriate shape depending on the purpose. Examples of shapes for the absorbent core include rectangular, elliptical, and various other shapes. In this embodiment, the absorption core 8c is formed from a single mat, but the absorption core 8c may be formed from multiple mats.

[0046] The core wrap sheet 7 is a thin, liquid-permeable sheet. By wrapping the absorbent core 8c with the core wrap sheet 7, the SAP from the absorbent core 8c is less likely to mix with other structures. Furthermore, deformation of the absorbent core 8c is suppressed. The core wrap sheet 7 can be made from pulp fibers, and tissue paper can be used as an example. The core wrap sheet 7 may be a single sheet, or it may consist of two sheets: an upper sheet placed on the skin side of the wearer, and a lower sheet placed on the non-skin side of the wearer, which wraps around the sides of the absorbent core 8c and the skin side. If the core wrap sheet 7 consists of two sheets, the widthwise end of the upper sheet may be wrapped around the other sheets (for example, the side sheets 10L, 10R, back sheet 6, and top sheet 9 described later). Note that the absorbent body 8 is wrapped around the back sheet 6 and top sheet 9, and deformation can also be suppressed by these sheets, so the core wrap sheet 7 may not be provided.

[0047] The back sheet 6, absorbent material 8, and top sheet 9 all extend from the front body region 1F to the back body region 1R. Therefore, when the back sheet 6, absorbent material 8, and top sheet 9 are layered to cover the wearer's genital area (crotch), the longitudinal ends of the back sheet 6, absorbent material 8, and top sheet 9 are located on the wearer's ventral and dorsal sides. In other words, the wearer's genital area is covered by the absorbent material 8 from the wearer's ventral to dorsal side. Therefore, whether the wearer is lying face down or face down when expelling fluid from the body, the expelled fluid will come into contact with the absorbent material 8 via the top sheet 9.

[0048] Furthermore, the diaper 1 has elongated strip-shaped side sheets 10L and 10R for forming the three-dimensional gathers 3BL and 3BR described above. The side sheets 10L and 10R are provided on the long side of the top sheet 9. Elastic threads 10L1 and 10R1 are bonded to the side sheets 10L and 10R along their longitudinal direction. Thus, the edge 4F4 which forms the left edge of the front body region 1F of the cover sheet 4 and the edge 4R4 which forms the left edge of the back body region 1R are joined to each other, and the edge 4F5 which forms the right edge of the front body region 1F of the cover sheet 4 and the back When the edge 4R5, which forms the right edge of region 1R, is joined to each other, the diaper 1 is completed as shown in Figure 1. In this completed state, the side sheets 10L and 10R are pulled longitudinally by the contractile force of the elastic threads 10L1 and 10R1 and rise from the top sheet 9 along the fold lines 10L2 and 10R2. As a result, three-dimensional gathers 3BL and 3BR are formed to prevent liquid from leaking out of the left lower limb opening 2L and the right lower limb opening 2R. The method of joining the edges 4F4 and 4R4, and edges 4F5 and 4R5 is not particularly limited, but can be done by heat sealing, high-frequency sealing, ultrasonic sealing, etc.

[0049] Furthermore, the diaper 1 has an end sheet 11F that is laminated on the wearer-facing side of the front body region 1F of the cover sheet 4, and an end sheet 11R that is laminated on the wearer-facing side of the back body region 1R of the cover sheet 4, sandwiching the back sheet 6, absorbent material 8, top sheet 9, and side sheets 10L, 10R. The end sheets 11F and 11R are strip-shaped sheets that are layered on the cover sheet 4 and inner cover sheet 5 at one end in the longitudinal direction of the top sheet 9. The end sheets 11F and 11R are made of non-permeable nonwoven fabric and mainly reinforce the cover sheet 4 and inner cover sheet 5 in the waist-contacting portion of the diaper 1. In addition, adhesive is applied to the end sheets 11F and 11R, and they are bonded to the inner cover sheet 5 by this adhesive. The end sheets 11F and 11R are positioned on the skin-facing side of the laminate formed by the back sheet 6, absorbent 8, top sheet 9, and side sheets 10L and 10R, preventing the edges of the laminate from directly touching the skin and causing discomfort to the wearer.

[0050] Figure 3 is a schematic diagram showing the diaper 1 according to Embodiment 1 in an unfolded and extended state. Figure 3(A) schematically shows the internal structure of the unfolded and extended diaper 1 as viewed from the left side. Figure 3(B) is a plan view of the unfolded and extended diaper 1. Note that in Figure 3(B), the illustration of the side sheets 10L, 10R and the end sheets 11F, 11R is omitted. The cover sheet 4 has one end folded back at the fold lines 4FF and 4RF shown in Figure 2. The waist gather 3R described above is formed by adhering thread elastic (thread-like elastic) 4F1, 4F2 to the front body area of ​​the cover sheet 4 and adhering thread elastic (thread-like elastic) 4R1, 4R2 to the back body area of ​​the cover sheet 4. The elastic threads 4F1 and 4F2 are provided along the fold line 4FF, which forms the upper edge of the front bodice area 1F when folded, in the order of elastic thread 4F1 and elastic thread 4F2 from the fold line 4FF side. Similarly, the elastic threads 4R1 and 4R2 are provided along the fold line 4RF, which forms the upper edge of the back bodice area 1R when folded, in the order of elastic thread 4R1 and elastic thread 4R2 from the fold line 4RF side.

[0051] Therefore, the elastic threads 4F1 and 4F2 are provided on the cover sheet 4 with their longitudinal direction, which is the direction of stretching, oriented in the left-right direction of the diaper 1. Similarly, the elastic threads 4R1 and 4R2 are provided on the cover sheet 4 with their longitudinal direction, which is the direction of stretching, oriented in the left-right direction of the diaper 1. Thus, when the edges 4F4 and 4R4 are joined to each other, and the edges 4F5 and 4R5 are joined to each other, the elastic threads 4F1 and 4F2 and the elastic threads 4R1 and 4R2 form a substantially annular stretchable member that wraps around the waist opening 2T, and exert the function of contracting the waist opening 2T in the waist direction. In other words, the elastic threads 4F1 and 4F2 and the elastic threads 4R1 and 4R2 exert a contracting force to make the diaper 1 adhere closely to the wearer, preventing the formation of a gap between the diaper 1 and the wearer's waist circumference. The elastic threads 4F2 and 4R2 overlap with the absorbent material 8 in a portion of their crotch area 1B side.

[0052] The elastic threads 4F1 and 4R1 are provided to extend horizontally along the upper edges of the front and back body regions 1F and 1R shown in Figure 1. The elastic threads 4F2 and 4R2 are provided parallel to each other at predetermined intervals. When the diaper 1 is worn, the elastic threads 4F1 and 4R1 tighten relatively strongly around the wearer's waist above the elastic threads 4F2 and 4R2. The elastic threads 4F1 and 4R1 ensure that the diaper 1 fits snugly to the wearer, preventing it from shifting and preventing leakage of discharge from the abdomen and back. The elastic threads 4F2 and 4R2 alleviate the pressure on the wearer caused by the elastic force of 4F1 and 4R1. In addition, if an inner pad is used, it suppresses the shifting of the inner pad.

[0053] Furthermore, elastic threads 4F3 and 4R3 are bonded to the cover sheet 4. Elastic threads 4F3 and 4R3 are stretchable members provided in the area of ​​the cover sheet 4 closer to the crotch region 1B than elastic threads 4F2 and 4R2. However, unlike the other elastic threads which are bonded continuously from the left end to the right end of the cover sheet 4, elastic threads 4F3 and 4R3 are arranged in a curve towards the crotch region 1B and overlap with a part of the core wrap sheet 7 at the constricted portion of the hourglass-shaped absorbent core. This configuration allows the areas where elastic threads 4F3 and 4R3 are placed to function as leg gathers 3LL and 3LR.

[0054] The cover sheet 4 is folded back along the fold lines 4FF and 4RF and extends to the area where the elastic threads 4F1 and 4R1 are placed, reinforcing the area where the elastic threads 4F1 and 4R1 are placed with the folded portion. The end sheets 11F and 11R are provided in the area where the elastic threads 4F2 and 4R2 are placed, where the cover sheet 4 folded back along the fold lines 4FF and 4RF does not extend, and reinforcing the area where the elastic threads 4F2 and 4R2 are placed.

[0055] In this application, the term "overlapping sheets" is not limited to a state in which the overlapping sheets are in full contact with each other, but also includes a concept that includes a state in which only parts of the sheets overlap. For example, the end sheet 11F is overlapped such that a part of one end of the back sheet 6 in the longitudinal direction touches a part of the cover sheet 4. The diaper 1 is formed by stacking the back sheet 6 and top sheet 9 with the absorbent material 8 in between, as well as the cover sheet 4, end sheets 11F, 11R, inner cover sheet 5, and side sheets 10L, 10R. Therefore, it can be said that the diaper has a laminate made up of these multiple sheets stacked on top of each other.

[0056] Figure 4 is a plan view of the diaper 1 in its unfolded and extended state. Figure 4 shows the diaper 1 from the skin-facing side, and the inner cover sheet 5, back sheet 6, and top sheet 9 are omitted from the illustration. The absorbent body 8 has an absorbent core 8c and a core wrap sheet 7 that covers the absorbent core 8c. The absorbent body 8 is positioned so that its longitudinal direction is aligned with the wearer's front-to-back direction. The absorbent core 8c has, in the longitudinal direction, an abdominal area 81, a first widened section 82 which is narrower than the abdominal area 81 in the width direction perpendicular to the longitudinal direction, a crotch area 83 which is narrower than the first widened section 82 in the width direction, a second widened section 84 which is wider than the crotch area 83 in the width direction, and a back area 85 which is wider than the second widened section 84 in the width direction. The core wrap sheet 7 is wider than the first widened section 82 and the second widened section 84 in the width direction. The core wrap sheet 7 is wider than the crotch area 83 in the width direction. In Figure 4, the core wrap sheet 7 is wider than the abdominal 81 and back 85 in the width direction, but the configuration is not limited to that shown in Figure 4. The length of the core wrap sheet 7 in the width direction may be the same as the length of the abdominal 81 in the width direction. The length of the core wrap sheet 7 in the width direction may be the same as the length of the back 85 in the width direction. In Figure 4, the longitudinal direction is indicated by D1 and the width direction by D2. The cover sheet 4 is positioned on the non-skin side of the absorbent 8.

[0057] The abdominal portion 81 and the dorsal portion 85 are, for example, rectangular in shape, and in Figure 4, the abdominal portion 81 and the dorsal portion 85 are the widest parts of the absorption core 8c in the width direction. The abdominal portion 81 may be wider in the width direction than the dorsal portion 85, or the dorsal portion 85 may be wider in the width direction than the abdominal portion 81. The abdominal portion 81 has an end located on the opposite side of the boundary between the abdominal portion 81 and the first widening portion 82 in the longitudinal direction. The longitudinal length of the abdominal portion 81 is approximately 50 mm. For example, the abdominal portion 81 may be the range from the end of the abdominal portion 81 in the absorption core 8c to approximately 50 mm toward the center of the absorption core 8c. The back portion 85 has an end located on the opposite side of the boundary between the back portion 85 and the second widening portion 84 in the longitudinal direction. The longitudinal length of the back portion 85 is approximately 50 mm. For example, the back portion 85 may extend from the end of the back portion 85 in the absorbing core 8c to approximately 50 mm toward the central portion of the absorbing core 8c.

[0058] The crotch area 83 is, for example, rectangular in shape and is the narrowest in the width direction among all parts of the absorbent core 8c. The longitudinal length of the crotch area 83 is approximately 50 mm. For example, the crotch area 83 may consist of a range from the narrowest part in the width direction of the absorbent core 8c toward the abdomen 81, and a range from the narrowest part in the width direction of the absorbent core 8c toward the back 85, both of which extend approximately 25 mm. The first widening section 82 widens from the crotch area 83 toward the abdomen 81. The second widening section 84 widens from the crotch area 83 toward the back 85. The first widening section 82 and the second widening section 84 may have a tapered shape in which the length in the width direction gradually increases, or they may have a shape in which the length in the width direction increases in steps.

[0059] Since the width of the wearer's genitals is roughly the same regardless of the wearer's body size, the width of the crotch area 83 can be designed based on the width of the wearer's genitals. When the diaper 1 is worn, the abdomen 81 and back 85 are not very curved and are in a nearly flat state, so they are not easily deformed. On the other hand, the area between the wearer's abdomen and genitals, and the area between the wearer's back and genitals, vary greatly depending on the wearer's body size and gender, so the first widening section 82 and the second widening section 84 are easily deformed when the diaper 1 is worn, and are therefore prone to losing their shape.

[0060] Multiple elastic threads (an example of the "expandable member" in this application), including multiple elastic threads 4F1, multiple elastic threads 4F2, and multiple elastic threads 4F3, are arranged in an extended state. The number of elastic threads 4F1, 4F2, and 4F3 can be set arbitrarily and is not limited to the number shown in each drawing. Multiple elastic threads 4F3 have both ends, and one end of at least one of the elastic threads 4F3 extends in the width direction and overlaps with the core wrap sheet 7 and the absorbent 8 in the thickness direction on the outside of the width direction of the first widening section 82. For example, one end of all or more of the elastic threads 4F3 may extend in the width direction and overlap with the core wrap sheet 7 and the absorbent 8 in the thickness direction on the outside of the width direction of the first widening section 82. The portion of the multiple elastic threads 4F3 that overlaps with the core wrap sheet 7 is adhered to at least one of the cover sheet 4 and the core wrap sheet 7. In the following explanation, when describing the overlapping of the elastic thread 4F3 with the core wrap sheet 7, it means that the elastic thread 4F3 overlaps with the core wrap sheet 7 and the absorbent 8 in the thickness direction.

[0061] Multiple elastic threads 4F3 are arranged in an extended state, with at least one end of each elastic thread 4F3 extending in the width direction and overlapping with the core wrap sheet 7 on the outside of the first widening section 82 in the width direction. At least one elastic thread 4F3 pulls the first widening section 82 outward in the width direction, preventing the first widening section 82 from shrinking excessively in the width direction and preventing deformation of the absorption core 8c.

[0062] The multiple elastic threads 4F3 do not overlap in the thickness direction of the absorbent core 8c and the absorbent material 8. By preventing the multiple elastic threads 4F3 from overlapping in the thickness direction of the absorbent core 8c and the absorbent material 8, the multiple elastic threads 4F3 are prevented from shrinking the absorbent core 8c in the width direction. This prevents the absorbent core 8c from losing its shape due to shrinkage in the width direction, and makes it possible to expand the absorbent core 8c more reliably in the width direction.

[0063] Multiple elastic threads (an example of the "stretchable member" in this application), including multiple elastic threads 4R1, multiple elastic threads 4R2, and multiple elastic threads 4R3, are arranged in an extended state. The number of elastic threads 4R1, 4R2, and 4R3 can be set arbitrarily and is not limited to the number shown in each drawing. Multiple elastic threads 4R3 (an example of the "second stretchable member" in this application) have both ends, and multiple elastic threads 4 At least one end of each of the multiple elastic threads 4R3 extends in the width direction and overlaps the core wrap sheet 7 and the absorbent 8 in the thickness direction on the outside of the second widening portion 84 in the width direction. For example, one end of all or more of the multiple elastic threads 4R3 may extend in the width direction and overlap the core wrap sheet 7 and the absorbent 8 in the thickness direction on the outside of the second widening portion 84 in the width direction. The portion of the multiple elastic threads 4R3 that overlaps with the core wrap sheet 7 is adhered to at least one of the cover sheet 4 and the core wrap sheet 7. In the following description, when the overlapping of the elastic threads 4R3 with the core wrap sheet 7 is explained, it means that the elastic threads 4R3 overlap the core wrap sheet 7 and the absorbent 8 in the thickness direction.

[0064] Multiple elastic threads 4R3 are arranged in an extended state, with at least one end of each elastic thread 4R3 extending in the width direction and overlapping with the core wrap sheet 7 on the outside of the second widening section 84 in the width direction. At least one elastic thread 4R3 pulls the second widening section 84 outward in the width direction, preventing the second widening section 84 from shrinking excessively in the width direction and preventing deformation of the absorbing core 8c.

[0065] The multiple elastic threads 4R3 do not overlap in the thickness direction of the absorbent core 8c and the absorbent material 8. By preventing the multiple elastic threads 4R3 from overlapping in the thickness direction of the absorbent core 8c and the absorbent material 8, the multiple elastic threads 4R3 are prevented from shrinking the absorbent core 8c in the width direction. This prevents the absorbent core 8c from losing its shape due to shrinkage in the width direction, and makes it possible to expand the absorbent core 8c more reliably in the width direction.

[0066] Figure 5 is an enlarged view of the absorbent body 8 and the surrounding cover sheet 4 in the diaper 1 according to this embodiment. Figure 5 shows the absorbent body 8 from the skin side, and the inner cover sheet 5, back sheet 6, top sheet 9, etc. are not shown. The first widening portion 82 has a region 82A (an example of the "first region" in this application) located closer to the crotch area 83 and a region 82B (an example of the "second region" in this application) located closer to the abdomen 81. The second widening portion 84 has a region 84A (an example of the "third region" in this application) located closer to the crotch area 83 and a region 84B (an example of the "fourth region" in this application) located closer to the back area 85.

[0067] The multiple elastic threads 4F3 include multiple elastic threads 4F3A (an example of the "first expandable member" in this application) and one or more elastic threads 4F3B (an example of the "third expandable member" in this application). At least one end of each of the multiple elastic threads 4F3A extends in the width direction and overlaps with the core wrap sheet 7 on the outside of the first widening portion 82 in the width direction. In Figure 5, one end of all of the multiple elastic threads 4F3A extends in the width direction and overlaps with the core wrap sheet 7 on the outside of the first widening portion 82 in the width direction. The configuration is not limited to that shown in Figure 5, and as shown in Figure 6, one end of more than half of the multiple elastic threads 4F3A may extend in the width direction and overlap with the core wrap sheet 7 on the outside of the first widening portion 82 in the width direction. Figure 6 is an enlarged view of the absorbent body 8 and the surrounding cover sheet 4 in the diaper 1 according to this embodiment. Figure 6 shows the absorbent body 8 viewed from the skin side, and the inner cover sheet 5, back sheet 6, and top sheet 9 are omitted from the illustration. In addition, one end of less than half of the multiple elastic threads 4F3A may extend in the width direction and overlap with the core wrap sheet 7 on the outside of the first widening portion 82 in the width direction.

[0068] In Figure 5, one end of more than half of the multiple elastic threads 4F3A extends in the width direction and overlaps with the core wrap sheet 7 on the outside of the width direction of the region 82A of the first widening section 82. The configuration is not limited to that shown in Figure 5; one end of all of the multiple elastic threads 4F3A may extend in the width direction and overlap with the core wrap sheet 7 on the outside of the width direction of the region 82A of the first widening section 82. In this case, on the outside of the width direction of the region 82B of the first widening section 82 and on the outside of the width direction of the crotch area 83, the multiple elastic threads 4F3A None of them overlap with the core wrap sheet 7.

[0069] The crotch area 83 is easily crushed, while the abdomen area 81 is not easily crushed, so the first widening section 82 is more easily crushed the closer it is to the crotch area 83. Therefore, multiple elastic threads 4F3A may be placed in the area close to the crotch area 83. One end of all or more of the multiple elastic threads 4F3A extends in the width direction and overlaps with the core wrap sheet 7 on the outside of the width direction of the area 82A of the first widening section 82, thereby effectively (directly) resisting the force that crushes the absorbent core 8c. This suppresses deformation of the absorbent core 8c, Furthermore, it prevents the 8c absorption core from losing its shape.

[0070] In Figure 5, one end of all of the multiple elastic threads 4R3 extends in the width direction and overlaps with the core wrap sheet 7 on the outside of the second widening section 84 in the width direction. The configuration is not limited to that shown in Figure 5, and as shown in Figure 6, one end of more than half of the multiple elastic threads 4R3 may extend in the width direction and overlap with the core wrap sheet 7 on the outside of the second widening section 84 in the width direction. Alternatively, one end of less than half of the multiple elastic threads 4R3 may extend in the width direction and overlap with the core wrap sheet 7 on the outside of the second widening section 84 in the width direction.

[0071] In Figure 5, one end of more than half of the multiple elastic threads 4R3 extends in the width direction and overlaps with the core wrap sheet 7 on the outside of the width direction of the region 84A of the second widening section 84. The configuration is not limited to that shown in Figure 5; one end of all of the multiple elastic threads 4R3 may extend in the width direction and overlap with the core wrap sheet 7 on the outside of the width direction of the region 84A of the second widening section 84. In this case, none of the multiple elastic threads 4R3 overlap with the core wrap sheet 7 on the outside of the width direction of the region 84B of the second widening section 84 and on the outside of the width direction of the crotch area 83.

[0072] The crotch area 83 is easily crushed, while the back area 85 is not easily crushed, so the second widening section 84 is more easily crushed the closer it is to the crotch area 83. Therefore, multiple elastic threads 4R3 may be arranged in an area close to the crotch area 83. One end of all or more of the multiple elastic threads 4R3 extends in the width direction and overlaps with the core wrap sheet 7 on the outside of the width direction of the area 84A of the second widening section 84, thereby effectively (directly) resisting the force that crushes the absorbing core 8c. This suppresses deformation of the absorbing core 8c and absorbs This prevents the core 8c from losing its shape.

[0073] In Figure 5, one end of each of the two elastic threads 4F3A extends in the width direction and overlaps with the core wrap sheet 7 on the outside in the width direction of the boundary between the first widening section 82 and the crotch area 83. The configuration is not limited to that shown in Figure 5; one end of each of a single elastic thread 4F3A may extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the first widening section 82 and the crotch area 83. Thus, one end of each of one or two elastic threads 4F3A may extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the first widening section 82 and the crotch area 83.

[0074] In Figure 5, one end of each of the two elastic threads 4F3A extends in the width direction and overlaps with the core wrap sheet 7 outside the width direction boundary between the areas 82A and 82B of the first widening section 82. The configuration is not limited to that shown in Figure 5; one end of each of a single elastic thread 4F3A may extend in the width direction and overlap with the core wrap sheet 7 outside the width direction boundary between the areas 82A and 82B of the first widening section 82. Thus, one end of each of one or two elastic threads 4F3A may extend in the width direction and overlap with the core wrap sheet 7 outside the width direction boundary between the areas 82A and 82B of the first widening section 82.

[0075] In Figure 5, one end of each of the two elastic threads 4R3 extends in the width direction and overlaps with the core wrap sheet 7 on the outside in the width direction of the boundary between the crotch area 83 and the second widening area 84. The configuration is not limited to that shown in Figure 5; one end of each of the single elastic threads 4R3 may extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the crotch area 83 and the second widening area 84. Thus, one end of each of one or two elastic threads 4R3 may extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the crotch area 83 and the second widening area 84.

[0076] In Figure 5, one end of each of the two elastic threads 4R3 extends in the width direction and overlaps with the core wrap sheet 7 outside the width direction boundary between areas 84A and 84B of the second widening section 84. The configuration is not limited to that shown in Figure 5; one end of each of a single elastic thread 4R3 may extend in the width direction and overlap with the core wrap sheet 7 outside the width direction boundary between areas 84A and 84B of the second widening section 84. Thus, one end of each of one or two elastic threads 4R3 may extend in the width direction and overlap with the core wrap sheet 7 outside the width direction boundary between areas 84A and 84B of the second widening section 84.

[0077] As shown in Figure 5, one end of each elastic thread 4F3B extends in the width direction and overlaps with the core wrap sheet 7 on the outside in the width direction of the crotch area 83 near the boundary between the first widening section 82 and the crotch area 83. In Figure 5, multiple elastic threads 4F3B are provided in the diaper 1, but the configuration is not limited to this. One elastic thread 4F3B may be provided in the diaper 1. Also, in Figure 5, one elastic thread 4F3B is placed next to multiple elastic threads 4F3A arranged in a row in the longitudinal direction, but the number of elastic threads 4F3B is not limited, and multiple elastic threads 4F3B may be placed next to multiple elastic threads 4F3A. On the other hand, none of the multiple elastic threads 4R3 are placed on the outside in the width direction of the crotch area 83 near the boundary between the crotch area 83 and the second widening section 84.

[0078] The second widening section 84 is prone to being crushed by being caught in the gap between the wearer's buttocks. Therefore, by overlapping one end of all of the elastic threads 4R3 with the core wrap sheet 7 on the outside of the second widening section 84 in the width direction, the second widening section 84 can be more reliably widened in the width direction. Thus, it becomes possible to better prevent the second widening section 84 from being crushed.

[0079] The portions of each elastic thread 4F3A, 4F3B, and 4R3 that overlap with the core wrap sheet 7 extend in the width direction. Since each elastic thread 4F3A, 4F3B, and 4R3 are positioned in an elongated state, the portions of each elastic thread 4F3A, 4F3B, and 4R3 that overlap with the core wrap sheet 7 contract in the width direction.

[0080] The portions of each elastic thread 4F3A, 4F3B, and 4R3 that do not overlap with the core wrap sheet 7 are adhered to the cover sheet 4 and extend along the left lower limb opening 2L or the right lower limb opening 2R (an example of the "leg opening" in this application) provided in the cover sheet 4. In Figure 5, the portions of each elastic thread 4F3A, 4F3B, and 4R3 that do not overlap with the core wrap sheet 7 extend in the width direction and diagonally to the width direction. The configuration is not limited to that shown in Figure 5, and the portions of each elastic thread 4F3A, 4F3B, and 4R3 that do not overlap with the core wrap sheet 7 may extend along at least one of the width direction and diagonally to the width direction. In this way, each elastic thread 4F3A, 4F3B, and 4R3 can function as an expandable / contractable member in the leg gathers 3LL and 3LR.

[0081] In the width direction of the first widening section 82, the area outside the core wrap sheet 7 for stretching each elastic thread 4F3A, 4F3B is small. By arranging the parts of each elastic thread 4F3A, 4F3B that do not overlap with the core wrap sheet 7 diagonally toward the abdominal side 81, each elastic thread 4F3A, 4F3B can be stretched toward a larger area. As a result, Each elastic thread 4F3A, 4F3B exerts a greater pulling force on the absorbent core 8c, making it possible to more reliably expand the absorbent core 8c in the width direction. The area outside the core wrap sheet 7 in the width direction of the second widening section 84 is small for stretching each elastic thread 4R3. By arranging the parts of each elastic thread 4R3 that do not overlap with the core wrap sheet 7 diagonally toward the back 85 side, each elastic thread 4R3 can be stretched toward a larger area. As a result, each elastic thread 4R3 exerts a greater pulling force on the absorbent core 8c, making it possible to more reliably expand the absorbent core 8c in the width direction.

[0082] Furthermore, the portions of each elastic thread 4F3A, 4F3B, and 4R3 that do not overlap with the core wrap sheet 7 may extend within a range of ±45 degrees relative to the width direction. By making the widthwise elasticity of each elastic thread 4F3A, 4F3B, and 4R3 greater than the longitudinal elasticity of each elastic thread 4F3A, 4F3B, and 4R3, the force with which each elastic thread 4F3A, 4F3B, and 4R3 pulls the absorbent core 8c in the width direction becomes greater, making it possible to more reliably expand the absorbent core 8c in the width direction.

[0083] When a portion of the first widening section 82 is pulled by multiple elastic threads 4F3A, the contractile force of each elastic thread 4F3A is not transmitted to the portion other than the pulled portion, which can cause the first widening section 82 to deform unevenly compared to when there are no elastic threads 4F3A. Therefore, multiple elastic threads 4F3A may be arranged so that the entire length of the first widening section 82 is pulled outward in the width direction of the first widening section 82. For example, multiple elastic threads 4F3A may be arranged on the outside in the width direction of the first widening section 82 so that the longitudinal spacing between them is approximately the same. With such an arrangement, it becomes possible to pull the entire length of the first widening section 82 outward in the width direction of the first widening section 82.

[0084] Multiple elastic threads 4R3 may be arranged so that the entire lengthwise second widening section 84 is pulled outward in the widthwise direction of the second widening section 84. For example, multiple elastic threads 4R3 may be arranged on the outside in the widthwise direction of the second widening section 84 such that the longitudinal spacing between them is approximately the same. This arrangement makes it possible to pull the entire lengthwise second widening section 84 outward in the widthwise direction of the second widening section 84.

[0085] Each elastic thread 4F3A may be arranged such that the entire area 82A of the first widening section 82 in the longitudinal direction is pulled outward in the width direction of the area 82A of the first widening section 82. For example, multiple elastic threads 4F3A may be arranged on the outside in the width direction of the area 82A of the first widening section 82 such that the longitudinal spacing between them is approximately the same. This arrangement makes it possible to pull the entire area 82A of the first widening section 82 in the longitudinal direction outward in the width direction of the area 82A of the first widening section 82.

[0086] Each elastic thread 4R3 may be arranged such that the entire area 84A of the second widening section 84 in the longitudinal direction is pulled outward in the width direction of the area 84A of the second widening section 84. For example, multiple elastic threads 4R3 may be arranged on the outside in the width direction of the area 84A of the second widening section 84 such that the longitudinal spacing between them is approximately the same. This arrangement makes it possible to pull the entire area 84A of the second widening section 84 in the longitudinal direction outward in the width direction of the area 84A of the second widening section 84.

[0087] As shown in Figure 5, the multiple elastic threads 4F2 include multiple elastic threads 4F2A and multiple elastic threads 4F2B (an example of the "fourth stretchable member" of this application). The multiple elastic threads 4F2A and multiple elastic threads 4F2B extend in the width direction. In Figure 5, the multiple elastic threads 4F2 include multiple elastic threads 4F2B, but the configuration is not limited to this. The multiple elastic threads 4F2 may include one elastic thread 4F2B. The central portion of each elastic thread 4F2B is arranged to overlap with the end of the abdominal portion 81 and the thickness direction of the absorbent 8, and the portion of each elastic thread 4F2B other than the central portion The position is located outside the widthwise end of the abdomen 81.

[0088] Each elastic thread 4F2B pulls the end of the abdomen 81 outward in the width direction, and each elastic thread 4F3A pulls the first widening portion 82 outward in the width direction, thereby pulling the region from the end of the abdomen 81 to the first widening portion 82 outward in the width direction of the absorbent core 8c. As a result, deformation of the absorbent core 8c can be further suppressed, and deformation of the absorbent core 8c can be further prevented. However, the central part of each elastic thread 4F2B, which is arranged to overlap the end of the abdomen 81 and the absorbent body 8 in the thickness direction, may cause the absorbent core 8c to contract, potentially weakening the force pulling the first widening portion 82 outward in the width direction. For this reason, it is preferable to overlap each elastic thread 4F2B only at the end of the abdomen 81 in the thickness direction of the absorbent body 8.

[0089] As shown in Figure 5, the multiple elastic threads 4R2 include multiple elastic threads 4R2A and multiple elastic threads 4R2B (an example of the "fifth stretchable member" of this application). The multiple elastic threads 4R2A and multiple elastic threads 4R2B extend in the width direction. In Figure 5, the multiple elastic threads 4R2 include multiple elastic threads 4R2B, but the configuration is not limited to this. The multiple elastic threads 4R2 may include one elastic thread 4R2B. The central portion of each elastic thread 4R2B is arranged to overlap the end of the back portion 85 and the thickness direction of the absorber 8, and the portions of each elastic thread 4R2B other than the central portion are arranged on the outside in the width direction of the end of the back portion 85.

[0090] Each elastic thread 4R2B pulls the end of the back portion 85 outward in the width direction, and each elastic thread 4R3 pulls the second widening portion 84 outward in the width direction, thereby pulling the area from the end of the back portion 85 to the second widening portion 84 outward in the width direction of the absorbent core 8c. As a result, deformation of the absorbent core 8c can be further suppressed, and deformation of the absorbent core 8c can be further prevented. However, the central part of each elastic thread 4R2B, which is arranged to overlap the end of the back portion 85 and the thickness direction of the absorbent body 8, may cause the absorbent core 8c to contract, potentially weakening the force pulling the second widening portion 84 outward in the width direction. For this reason, it is preferable to overlap each elastic thread 4R2B only at the end of the back portion 85 in the thickness direction of the absorbent body 8.

[0091] Some of the multiple elastic threads 4F3A overlap with the core wrap sheet 7, but other parts of the multiple elastic threads 4F3A do not overlap with the core wrap sheet 7. In this case, one end of the other part of the multiple elastic threads 4F3A may extend in the width direction and be positioned outside the width direction of the first widening section 82. Some of the multiple elastic threads 4R3 overlap with the core wrap sheet 7, but other parts of the multiple elastic threads 4R3 do not overlap with the core wrap sheet 7. In this case, one end of the other part of the multiple elastic threads 4R3 may extend in the width direction and be positioned outside the width direction of the second widening section 84.

[0092] Figures 5 and 6 show an example configuration in which a portion of each elastic thread 4F3 and a portion of each elastic thread 4R3 extend along the left lower limb opening 2L or the right lower limb opening 2R, but the configuration is not limited to those shown in Figures 5 and 6. Figures 7 and 8 are enlarged views of the absorbent body 8 and the surrounding cover sheet 4. Figures 7 and 8 show the absorbent body 8 viewed from the skin side, and the inner cover sheet 5, back sheet 6, and top sheet 9 are not shown.

[0093] The configuration shown in Figure 7 will be described. As shown in Figure 7, all parts of the multiple elastic threads 4F3A may extend in the width direction and overlap with the core wrap sheet 7 on the outside of the first widening section 82 in the width direction. In this way, both ends or all parts of the multiple elastic threads 4F3A may extend in the width direction and overlap with the core wrap sheet 7 on the outside of the first widening section 82 in the width direction.

[0094] At least one of the multiple elastic threads 4F3A may have both ends or all parts extending in the width direction and overlapping with the core wrap sheet 7 on the outside of the width direction of the area 82A of the first widening portion 82. Both ends or all parts of the first widening portion 82 may extend in the width direction and overlap with the core wrap sheet 7 on the outside of the area 82B of the first widening portion 82 in the width direction.

[0095] All or more of the multiple elastic threads 4F3A may have both ends or all parts extending in the width direction and overlapping with the core wrap sheet 7 on the outside of the width direction of the area 82A of the first widening section 82. If the multiple elastic threads 4F3A are arranged only on the outside of the width direction of the area 82A of the first widening section 82, none of the multiple elastic threads 4F3A are arranged on the outside of the width direction of the area 82B of the first widening section 82.

[0096] At least one of the multiple elastic threads 4R3 may have both ends or all of it extending in the width direction and overlapping with the core wrap sheet 7 on the outside of the width direction of the area 84A of the second widening portion 84. At least one of the multiple elastic threads 4R3 may have both ends or all of it extending in the width direction and overlapping with the core wrap sheet 7 on the outside of the width direction of the area 84B of the second widening portion 84.

[0097] All or more of the multiple elastic threads 4R3 may have both ends or all parts extending in the width direction and overlapping with the core wrap sheet 7 on the outside of the width direction of the region 84A of the second widening section 84. If the multiple elastic threads 4R3 are arranged only on the outside of the width direction of the region 84A of the second widening section 84, none of the multiple elastic threads 4R3 are arranged on the outside of the width direction of the region 84B of the second widening section 84.

[0098] In Figure 7, the entire portions of the two elastic threads 4F3A extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the first widening portion 82 and the crotch area 83. The configuration is not limited to that shown in Figure 7; both ends or the entire portion of one elastic thread 4F3A may extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the first widening portion 82 and the crotch area 83. Thus, both ends or the entire portion of one or two elastic threads 4F3A may extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the first widening portion 82 and the crotch area 83.

[0099] At least one end or all portion of one of the multiple elastic threads 4F3A may extend in the width direction and overlap with the core wrap sheet 7 outside the width direction boundary between region 82A and region 82B of the first widening portion 82. In Figure 7, the entire portions of the two elastic threads 4F3A extend in the width direction and overlap with the core wrap sheet 7 outside the width direction boundary between region 82A and region 82B of the first widening portion 82.

[0100] In Figure 7, the entire portions of the two elastic threads 4R3 extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the crotch area 83 and the second widening portion 84. The configuration is not limited to that shown in Figure 7; both ends or the entire portion of one elastic thread 4R3 may extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the crotch area 83 and the second widening portion 84. Thus, both ends or the entire portion of one or two elastic threads 4R3 may extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the crotch area 83 and the second widening portion 84.

[0101] At least one end or all portion of one of the multiple elastic threads 4R3 may extend in the width direction and overlap with the core wrap sheet 7 outside the width direction boundary between region 84A and region 84B of the second widening portion 84. In Figure 7, the entire portions of the two elastic threads 4R3 extend in the width direction and overlap with the core wrap sheet 7 outside the width direction boundary between region 84A and region 84B of the second widening portion 84.

[0102] As shown in Figure 7, the entire portion of each elastic thread 4F3B extends in the width direction, and the first widening portion The core wrap sheet 7 may be superimposed on the outer side in the width direction of the crotch area 83 near the boundary between 82 and the crotch area 83. Both ends of each elastic thread 4F3B may extend in the width direction and be superimposed on the core wrap sheet 7 on the outer side in the width direction of the crotch area 83 near the boundary between the first widening portion 82 and the crotch area 83. In Figure 7, one elastic thread 4F3B is placed next to a plurality of elastic threads 4F3A arranged in a row in the longitudinal direction, but the number of elastic threads 4F3B is not limited, and multiple elastic threads 4F3B may be placed next to multiple elastic threads 4F3A.

[0103] Next, an example configuration shown in Figure 8 will be described. As shown in Figure 8, the entire portion of each elastic thread 4F3A may extend in the width direction, and more than half of each elastic thread 4F3A may overlap with the core wrap sheet 7 on the outside of the first widening portion 82 in the width direction. Both ends of each elastic thread 4F3A may extend in the width direction, and one end of each elastic thread 4F3A may overlap with the core wrap sheet 7 on the outside of the first widening portion 82 in the width direction.

[0104] At least one end of one of the multiple elastic threads 4F3A may overlap with the core wrap sheet 7 on the outside of the widthwise direction of the area 82A of the first widening section 82. More than half of at least one of the multiple elastic threads 4F3A may overlap with the core wrap sheet 7 on the outside of the widthwise direction of the area 82A of the first widening section 82.

[0105] At least one end of one of the multiple elastic threads 4F3A may overlap with the core wrap sheet 7 on the outside of the width direction of the area 82B of the first widening section 82. More than half of at least one of the multiple elastic threads 4F3A may overlap with the core wrap sheet 7 on the outside of the width direction of the area 82B of the first widening section 82.

[0106] All or more of the elastic threads 4F3A may have one end extending in the width direction and overlapping with the core wrap sheet 7 on the outside of the width direction of the area 82A of the first widening section 82. All or more of the elastic threads 4F3A may have more than half of their portions extending in the width direction and overlapping with the core wrap sheet 7 on the outside of the width direction of the area 82A of the first widening section 82. If the elastic threads 4F3A are arranged only on the outside of the width direction of the area 82A of the first widening section 82, none of the elastic threads 4F3A are arranged on the outside of the width direction of the area 82B of the first widening section 82.

[0107] In Figure 8, one end of each of the two elastic threads 4F3A extends in the width direction and overlaps with the core wrap sheet 7 on the outside in the width direction of the boundary between the first widening section 82 and the crotch area 83. The configuration is not limited to that shown in Figure 8; one end of each of a single elastic thread 4F3A may extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the first widening section 82 and the crotch area 83. Thus, one end of each of one or two elastic threads 4F3A may extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the first widening section 82 and the crotch area 83.

[0108] In Figure 8, one end of each of the two elastic threads 4F3A extends in the width direction and overlaps with the core wrap sheet 7 outside the width direction boundary between the areas 82A and 82B of the first widening section 82. The configuration is not limited to that shown in Figure 8; one end of each of a single elastic thread 4F3A may extend in the width direction and overlap with the core wrap sheet 7 outside the width direction boundary between the areas 82A and 82B of the first widening section 82. Thus, one end of each of one or two elastic threads 4F3A may extend in the width direction and overlap with the core wrap sheet 7 outside the width direction boundary between the areas 82A and 82B of the first widening section 82.

[0109] In Figure 8, one end of each of the two elastic threads 4R3 extends in the width direction and overlaps with the core wrap sheet 7 on the outside of the width direction of the boundary between the crotch area 83 and the second widening section 84. The configuration is not limited to that shown in Figure 8; one end of each of the elastic threads 4R3 extends in the width direction, and The core wrap sheet 7 may overlap with the boundary between the crotch area 83 and the second widening area 84 on the outside in the width direction. In this way, one or two ends of the elastic thread 4R3 may extend in the width direction and overlap with the core wrap sheet 7 on the outside in the width direction of the boundary between the crotch area 83 and the second widening area 84.

[0110] In Figure 8, one end of each of the two elastic threads 4R3 extends in the width direction and overlaps with the core wrap sheet 7 outside the width direction boundary between areas 84A and 84B of the second widening section 84. The configuration is not limited to that shown in Figure 8; one end of each of a single elastic thread 4R3 may extend in the width direction and overlap with the core wrap sheet 7 outside the width direction boundary between areas 84A and 84B of the second widening section 84. Thus, one end of each of one or two elastic threads 4R3 may extend in the width direction and overlap with the core wrap sheet 7 outside the width direction boundary between areas 84A and 84B of the second widening section 84.

[0111] As shown in Figure 8, the entire portion of each elastic thread 4F3B may extend in the width direction, and more than half of each elastic thread 4F3B may overlap with the core wrap sheet 7 on the outside in the width direction of the crotch area 83 near the boundary between the first widening portion 82 and the crotch area 83. Both ends of each elastic thread 4F3B may extend in the width direction, and one end of each elastic thread 4F3B may overlap with the core wrap sheet 7 on the outside in the width direction of the crotch area 83 near the boundary between the first widening portion 82 and the crotch area 83.

[0112] In Figure 8, one elastic thread 4F3B is placed next to multiple elastic threads 4F3A arranged in a row along the longitudinal direction. However, the number of elastic threads 4F3B is not limited, and multiple elastic threads 4F3B may be placed next to multiple elastic threads 4F3A.

[0113] As shown in Figure 8, the entire portion of each elastic thread 4R3 may extend in the width direction, and more than half of each elastic thread 4R3 may overlap with the core wrap sheet 7 on the outside of the second widening portion 84 in the width direction. In this case, both ends of each elastic thread 4R3 may extend in the width direction, and one end of each elastic thread 4R3 may overlap with the core wrap sheet 7 on the outside of the second widening portion 84 in the width direction.

[0114] In Figure 8, the portions of each elastic thread 4F3A, 4F3B, and 4R3 that do not overlap with the core wrap sheet 7 are adhered to the cover sheet 4 and extend in the width direction. The portions of each elastic thread 4F3A, 4F3B, and 4R3 that do not overlap with the core wrap sheet 7 may extend in at least one of the width direction and a direction oblique to the width direction.

[0115] Furthermore, the portions of each elastic thread 4F3A, 4F3B, and 4R3 that do not overlap with the core wrap sheet 7 may extend within a range of ±45 degrees relative to the width direction. By making the widthwise elasticity of each elastic thread 4F3A, 4F3B, and 4R3 greater than the longitudinal elasticity of each elastic thread 4F3A, 4F3B, and 4R3, the force with which each elastic thread 4F3A, 4F3B, and 4R3 pulls the absorbent core 8c in the width direction becomes greater, making it possible to more reliably expand the absorbent core 8c in the width direction.

[0116] Figure 9 is an enlarged view of the cover sheet 4 in the diaper 1 according to this embodiment. Figure 9 shows the parts of each elastic thread 4F3A, 4F3B, and 4R3 that do not overlap with the core wrap sheet 7. In Figure 9, there are 2 elastic threads 4F3A, but the number of elastic threads 4F3A is not limited to 2. In Figure 9, there are 3 elastic threads 4R3, but the number of elastic threads is not limited to 3. The parts of each elastic thread 4F3A, 4F3B, and 4R3 that do not overlap with the core wrap sheet 7 extend in the width direction and in a direction oblique to the width direction. That is, the parts of each elastic thread 4F3A that do not overlap with the core wrap sheet 7 have a portion that extends in the width direction and a portion that extends along a direction oblique to the width direction. In the elastic thread 4F3B, the portion that does not overlap with the core wrap sheet 7 has a portion that extends in the width direction and a portion that extends diagonally to the width direction. In each elastic thread 4R3, the portion that does not overlap with the core wrap sheet 7 has a portion that extends in the width direction and a portion that extends diagonally to the width direction.

[0117] The angle (θ) between the portion extending in the width direction and the portion extending diagonally to the width direction in the portion of each elastic thread 4F3A that does not overlap with the core wrap sheet 7 may be between 115 degrees and 145 degrees. The angle (θ) between the portion extending in the width direction and the portion extending diagonally to the width direction in the portion of each elastic thread 4F3B that does not overlap with the core wrap sheet 7 may be between 115 degrees and 145 degrees. The angle (θ) between the portion extending in the width direction and the portion extending diagonally to the width direction in the portion of each elastic thread 4R3 that does not overlap with the core wrap sheet 7 may be between 115 degrees and 145 degrees. By making the widthwise elasticity of each elastic thread 4F3A, 4F3B, and 4R3 greater than the longitudinal elasticity of each elastic thread 4F3A, 4F3B, and 4R3, the force with which each elastic thread 4F3A, 4F3B, and 4R3 pulls the absorbent core 8c in the widthwise direction becomes greater, making it possible to more reliably expand the absorbent core 8c in the widthwise direction.

[0118] The configurations shown in Figures 5 to 9 may be combined as appropriate. For example, at least one elastic thread 4F3A may overlap with the core wrap sheet 7 in the width direction of the first widening section 82 and extend along the left lower limb opening 2L or the right lower limb opening 2R, and all or more than half of at least one elastic thread 4F3A may overlap with the core wrap sheet 7 in the width direction of the first widening section 82. For example, at least one elastic thread 4R3 may overlap with the core wrap sheet 7 on the outside of the second widening section 84 in the width direction and extend along the left lower limb opening 2L or the right lower limb opening 2R, and all or more than half of at least one elastic thread 4R3 may overlap with the core wrap sheet 7 on the outside of the second widening section 84 in the width direction.

[0119] The longitudinal spacing between multiple elastic threads 4F3A may be 5 mm or more. The longitudinal spacing between multiple elastic threads 4R3 may be 5 mm or more. If multiple elastic threads 4F3B are arranged side by side along the longitudinal direction, the longitudinal spacing between multiple elastic threads 4F3B may be 5 mm or more.

[0120] Sensory evaluations were conducted on multiple diapers 1. In these sensory evaluations, the tightness of each diaper 1 was evaluated, with different longitudinal spacings between multiple elastic threads 4F3 and multiple elastic threads 4R3. In the sensory evaluations, 30 adult subjects participated, and each subject evaluated the tightness of each diaper 1 when wearing each diaper 1 without any clothing. Figure 10 is a table showing the results of the sensory evaluations. In the table in Figure 10, the "Diaper No." column indicates the number of each diaper 1. In the table in Figure 10, "×" indicates that 16 or more of the 30 subjects felt that diaper 1 was too tight, and "○" indicates that 16 or more of the 30 subjects did not feel that diaper 1 was too tight. As shown in Figure 10, when the longitudinal spacing between multiple elastic threads 4F3 and multiple elastic threads 4R3 is 4.9 mm or less, the tightening force of diaper 1 is often perceived as strong. As shown in Figure 10, when the longitudinal spacing between multiple elastic threads 4F3 and multiple elastic threads 4R3 is 5.0 mm or more, the tightening force of diaper 1 is often not perceived as strong.

[0121] <Example 1> Next, a modified example 1 of this embodiment of diaper 1 will be described. Figure 11 is an enlarged view of the absorbent body 8 and the surrounding cover sheet 4 in the modified example diaper 1. Multiple elastic threads 4F2 consist of multiple elastic threads 4F2A and multiple elastic threads 4F2C (the "sixth expandable member" of this application). The elastic threads 4F2A and 4F2C extend in the width direction. The elastic threads 4R2 have multiple elastic threads 4R2A and 4R2C (an example of the "seventh stretchable member" of this application). The elastic threads 4R2A and 4R2C extend in the width direction. Each elastic thread 4F2C does not overlap the absorbent body 8 in the thickness direction and is located outside the width direction of the end of the abdominal area 81. Each elastic thread 4R2C does not overlap the absorbent body 8 in the thickness direction and is located outside the width direction of the end of the back area 85.

[0122] Each elastic thread 4F2C pulls the end of the abdominal portion 81 outward in the width direction, and each elastic thread 4F3A pulls the first widened portion 82 outward in the width direction, thereby pulling the area from the end of the abdominal portion 81 to the first widened portion 82 outward in the width direction of the absorbent core 8c. As a result, deformation of the absorbent core 8c can be further suppressed, and deformation of the absorbent core 8c can be further prevented. Alternatively, by widening the core wrap sheet 7 in the width direction at the end of the abdominal portion 81, each elastic thread 4F2C may overlap the core wrap sheet 7 and the absorbent body 8 in the thickness direction on the outside of the width direction of the end of the abdominal portion 81. In this case, the portion of each elastic thread 4F2C that overlaps with the core wrap sheet 7 is adhered to at least one of the cover sheet 4 and the core wrap sheet 7.

[0123] Each elastic thread 4R2C pulls the end of the back portion 85 outward in the width direction, and each elastic thread 4R3 pulls the second widening portion 84 outward in the width direction, thereby pulling the area from the end of the back portion 85 to the second widening portion 84 outward in the width direction of the absorbent core 8c. As a result, deformation of the absorbent core 8c can be further suppressed, and deformation of the absorbent core 8c can be further prevented. Alternatively, by widening the core wrap sheet 7 in the width direction at the end of the back portion 85, each elastic thread 4R2C may overlap the core wrap sheet 7 and the absorbent body 8 in the thickness direction on the outside of the end of the back portion 85 in the width direction. In this case, the portion of each elastic thread 4R2C that overlaps with the core wrap sheet 7 is adhered to at least one of the cover sheet 4 and the core wrap sheet 7.

[0124] In the above example, multiple elastic threads 4F2 contain multiple elastic threads 4F2C, but the configuration is not limited to this. Multiple elastic threads 4F2 may contain one elastic thread 4F2C. In the above example, multiple elastic threads 4R2 contain multiple elastic threads 4R2C, but the configuration is not limited to this. Multiple elastic threads 4R2 may contain one elastic thread 4R2C.

[0125] <Embodiment 2> Next, we will describe the diaper 1 according to Embodiment 2. Figure 12 is a plan view of the diaper according to Embodiment 2 in an unfolded and extended state.

[0126] As shown in Figure 12, the elastic threads 4F3 that form the leg gathers are provided along the edges of the front body area of ​​the right lower limb opening 2R and the left lower limb opening 2L, into which the wearer's legs enter when the diaper 1 is assembled. The elastic threads 4F3 are provided to cross in the left-right direction in the front crotch area. Multiple elastic threads 4F3 overlap the absorbent core 8c in the thickness direction in the first widening section 82. The portion where the elastic threads 4F3 cross the first widening section 82 in the width direction is sometimes referred to as the "crossing portion of the elastic threads 4F3".

[0127] In the areas where the elastic thread 4F3 is provided to cross in the left-right direction, the elastic thread 4F3 and the absorbent material 8 overlap in the thickness direction of the diaper 1. Furthermore, the central part in the width direction of the crossing portion of the elastic thread 4F3 corresponds to the area of ​​the wearer's urethral opening when the diaper 1 is worn. Note that in the area where the absorbent material 8 overlaps in the thickness direction, the arrangement of the elastic thread 4F3 is not limited to crossing as shown in Figure 12. It is sufficient that the extending direction of the elastic thread 4F3 has a width component, and preferably the width component of the extending direction of the elastic thread 4F3 is longitudinal. It just needs to be larger than the directional component.

[0128] Furthermore, in this embodiment, the absorbent 8 and the combination of the absorbent 8 with the back sheet 6, top sheet 9, and side sheets 10L and 10R constitute the interior body (an example of the "interior body" in this application), and the cover sheet 4 on which the elastic thread is arranged and the inner cover sheet 5 together are sometimes referred to as the exterior body (an example of the "exterior body" in this application) as a concept corresponding to the interior body. The inner cover sheet 5 and the absorbent 8 are appropriately bonded together with adhesive via the back sheet 6 from the front to the rear. However, as shown in Figure 12, in the cross section of the elastic thread 4F3, the inner cover sheet 5 and the absorbent 8 are not bonded (referred to as the non-bonded region 15). In practice, in the non-bonded region 15, the inner cover sheet 5 and the back sheet 6 are not bonded. In this embodiment, the non-bonded region 15 is provided throughout the entire width of the interior body. Note that in Figure 12, the non-bonded region 15 is shown as filled in.

[0129] Furthermore, by providing a non-adhesive area 15, the diaper 1 can suppress the contraction of the absorbent material 8 in the area where the elastic thread 4F3 and the absorbent material 8 overlap. If the absorbent material contracts and comes into contact with the wearer's skin, it will cause discomfort to the wearer and reduce the wearing comfort. The diaper 1 according to this embodiment can suppress the reduction in wearing comfort by suppressing the contraction of the absorbent material 8. In addition, if the absorbent material contracts after absorbing urine, the pulp may break down. The diaper 1 according to this embodiment is less likely to lose its shape because it suppresses the contraction of the absorbent material 8.

[0130] Furthermore, the elastic thread 4F3 pulls the outer casing and the inner casing including the absorbent 8 on the non-adhesive area 15 forward, bringing the absorbent 8 closer to the urethral opening, making it easier for urine excreted from the urethral opening to penetrate the absorbent 8. As a result, the diaper 1 can suppress urine leakage.

[0131] On the other hand, the elastic threads 4R3 that form the leg gathers 3LR are provided so as to follow the edges of the back body area on the right lower limb opening 2R and the left lower limb opening 2L. The multiple elastic threads 4R3 overlap the absorbent core 8c in the thickness direction in the second widening section 84. The ends of the elastic threads 4R3 face in the width direction, but they are cut in the middle in the width direction, so the left elastic thread 4R3 and the right elastic thread 4R3 are not connected. It is preferable that the elastic threads 4R3 extend in the width direction in the portion that overlaps with the absorbent core 8c.

[0132] The area between the left and right elastic threads 4R3 that face each other becomes the anal area 45, which corresponds to the wearer's anus. In Figure 12, the anal area 45 is shown enclosed by a dotted line. The elastic threads 4R3 do not have elasticity in the central part of the width direction of the diaper 1 because the elastic threads 4R3 on both sides are not connected. In other words, the elastic threads 4R3 do not extend to the anal area 45, and the contractile force of the elastic threads 4R3 pulls the inner lining in the anal area 45 outward in the width direction, thus allowing the anal area 45 to be moved further away from the skin. As a result, the diaper 1 can form a stool-containing space in the anal area 45 for containing stool. By forming a stool-containing space, the diaper 1 can suppress the decrease in wearing comfort caused by stool sticking to the wearer's skin or getting into the gluteal cleft of the buttocks.

[0133] Next, the bonding configuration between the inner and outer parts will be described. Figure 13 is a plan view of the diaper 1 in its unfolded and extended state. Figure 13 illustrates the bonding portion between the inner and outer parts. The diaper 1 is equipped with a first bonding portion 30, a second bonding portion 31, and a third bonding portion 32 (an example of the "bonding portion" in this application) as bonding portions for bonding the inner and outer parts.

[0134] The first adhesive portion 30 is positioned in front of the non-adhesive area 15 and has a plurality of linear adhesive portions 30A that extend in the width direction of the diaper 1 and are spaced apart from each other in the longitudinal direction of the diaper 1. The plurality of linear adhesive portions 30A are located between the outer and inner parts of the inner cover sheet 5. The structure is formed by applying hot melt adhesive between the back sheet 6 and the structure itself. The multiple linear adhesive sections 30A are formed to be slightly narrower than the overall width of the interior body.

[0135] The second adhesive portion 31 is located behind (towards the crotch) the non-adhesive region 15 and has a plurality of linear adhesive portions 31A that extend in the width direction of the diaper 1 and are spaced apart from each other in the longitudinal direction of the diaper 1. The second adhesive portion 31 is an adhesive portion that adheres the outer body and the inner body in the crotch region. The plurality of linear adhesive portions 31A are formed by applying hot melt adhesive between the inner cover sheet 5 and the back sheet 6, which are the space between the outer body and the inner body. The plurality of linear adhesive portions 31A are formed to a width narrower than the total width of the inner body, and non-adhesive regions 16L and 16R, where the inner body and outer body are not adhered, are provided on the outer side in the width direction of the linear adhesive portions 31A.

[0136] The third adhesive portion 32 is located behind the second adhesive portion 31 and extends in the width direction of the diaper 1, while having a plurality of linear adhesive portions 32A that are spaced apart from each other in the longitudinal direction of the diaper 1. The plurality of linear adhesive portions 32A are formed by applying hot melt adhesive between the inner cover sheet 5 and the back sheet 6, which are the space between the outer body and the inner body. The plurality of linear adhesive portions 32A are formed to be slightly narrower than the total width of the inner body.

[0137] As shown in Figure 13, a third adhesive portion 32 is positioned in the region where the elastic thread 4R3 extends to the absorbent core 8c. Each of the multiple linear adhesive portions 32A of the third adhesive portion 32 does not overlap with the multiple elastic threads 4R3 in the thickness direction. As a result, the contraction force of the elastic thread 4R3 does not directly act on the inner lining. When the elastic thread 4R3 contracts, the outer lining outside the absorbent core 8c is strained in the thickness direction, and the absorbent core 8c is pulled outward in the width direction by the contraction force of the elastic thread 4R3, becoming flatter. As a result, the diaper 1 can fit the absorbent core 8c to the wearer's buttocks, improving the wearing comfort. In addition, because the contraction force of the elastic thread 4R3 does not directly act on the inner lining, the top sheet 9 is less likely to contract and wrinkles can be suppressed.

[0138] <Embodiment 3> Next, we will describe the diaper 1 according to Embodiment 3. Figure 14 is an example of an exploded perspective view of the diaper 1 according to Embodiment 3. Note that components identical to those of Embodiment 1 described above are denoted by the same reference numerals, and their descriptions are omitted.

[0139] In this embodiment, the absorbent body 8 has a plurality of mats. The absorbent body 8 has an absorbent core 8c consisting of a plurality of mats and a core wrap sheet 7 that encloses the absorbent core 8c. In this embodiment, as shown in Figure 14, the absorbent core 8c has an upper absorbent mat 8a and a lower absorbent mat 8b. The upper absorbent mat 8a is roughly hourglass-shaped with a constricted portion, and the lower absorbent mat 8b is rectangular. The width of the lower absorbent mat 8b is approximately the same as the width of the constricted portion of the upper absorbent mat 8a. Thus, the absorbent core 8c may be formed by laminating two layers of absorbent mats.

[0140] The embodiments and variations thereof disclosed above can be combined in any way. [Explanation of symbols]

[0141] 1. Diaper 1F ··Front bodice area 1B...Inseam area 1R · Back panel area 2R・Right lower limb opening 2L·Left lower limb opening 3BR, 3BL... 3D Gathered 3R Waist Gather 3LR, 3LL Leg Gather 4. Cover Sheet 4F1, 4F2, 4F2A, 4F2B, 4F2C, 4F3, 4F3A, 4F3B, 4R1, 4R2, 4R2A, 4R2B, 4R2C, 4R3... Elastic thread 4F4, 4R4, 4F5, 4R5...edge 4FF, 4RF ·· Turnaround line 5. Inner cover sheet 6. Back seat 7. Core Wrap Sheet 8. Absorbent material 8c Absorption Core 81...Abdomen 82. First widening section 83··Inseam 84. Second widening section 85...back 9. Top sheet 10L, 10R... Side seats 11F, 11R... End sheet 15...Non-adhesive area 30...1st adhesive part 31...Second adhesive part 32...Third adhesive part 45. Anal area

Claims

1. An absorbent article worn by the wearer, The absorbent material is positioned so that its longitudinal direction is aligned with the front-to-back direction of the wearer, A cover sheet is disposed on the non-skin side of the absorbent material and forms the outer surface of the absorbent article, Multiple expandable members arranged in an extended state, Equipped with, The absorbent body comprises an absorbent core having, in the longitudinal direction, an abdominal area, a first widened portion narrower than the abdominal area in the width direction perpendicular to the longitudinal direction, a crotch area narrower than the first widened portion in the width direction, a second widened portion wider than the crotch area in the width direction, and a back area wider than the second widened portion in the width direction, in this order; and a core wrap sheet covering the absorbent core, which is wider than the first widened portion and the second widened portion in the width direction. The plurality of expandable members include a plurality of first expandable members and a plurality of second expandable members. At least one of the ends of at least one of the plurality of first expandable members extends in the width direction and overlaps the core wrap sheet and the absorbent in the thickness direction on the outside of the width direction of the first widening portion. At least one of the ends of at least one of the plurality of second expandable members extends in the width direction and overlaps with the core wrap sheet in the thickness direction on the outside of the second widening portion in the width direction. The plurality of first expandable members are transverse in the width direction, The plurality of second expandable members are arranged on both sides in the width direction, the second expandable members on both sides are not connected, and the inner ends of the plurality of second expandable members in the width direction overlap the absorption core in the thickness direction in the second widening portion. Absorbent material.

2. At least one of the ends of one or two of the plurality of first expandable members extends in the width direction and overlaps the core wrap sheet in the thickness direction on the outside in the width direction of the boundary between the first expandable portion and the crotch area in the first expandable portion. At least one or two of the plurality of second expandable members, the ends of each second expandable member The other side extends in the width direction and overlaps the core wrap sheet in the thickness direction on the outside in the width direction of the boundary between the second widened portion and the crotch area in the second widened portion. The absorbent article according to claim 1.

3. The first widening portion has a first region located on the side closer to the crotch and a second region located on the side closer to the abdomen. The second widening portion has a third region located on the side closer to the crotch area and a fourth region located on the side closer to the back. At least one of the ends of all or more of the plurality of first expandable members extends in the width direction and overlaps with the core wrap sheet in the thickness direction on the outside of the width direction of the first region. At least one of the ends of all or more of the plurality of second expandable members extends in the width direction and overlaps the core wrap sheet in the thickness direction on the outside of the width direction of the third region. The absorbent article according to claim 1 or 2.

4. At least one of the ends of one or two of the plurality of first expandable members extends in the width direction and overlaps the core wrap sheet in the thickness direction outside the boundary between the first region and the second region in the width direction. At least one of the ends of one or two of the plurality of second expandable members extends in the width direction and overlaps the core wrap sheet in the thickness direction outside the width direction of the boundary between the third region and the fourth region. The absorbent article according to claim 3.

5. The plurality of first expandable members are arranged such that the entire area of ​​the first region in the longitudinal direction is pulled outward in the width direction of the first region. The plurality of second expandable members are arranged such that the entire area of ​​the second region in the longitudinal direction is pulled outward in the width direction of the second region. The absorbent article according to claim 3.

6. At least one of the plurality of first expandable members has all or half of its portion extending in the width direction and overlapping the core wrap sheet in the thickness direction on the outside of the first widening portion in the width direction. At least one of the plurality of second expandable members has all or half of its portion extending in the width direction and overlapping the core wrap sheet in the thickness direction on the outside of the second widening portion in the width direction. The absorbent article according to claim 1 or 2.

7. At least one of the plurality of first expandable members has all or half of its portion extending in the width direction and overlapping the core wrap sheet in the thickness direction on the outside of the width direction of the first region. At least one of the plurality of second expandable members has all or half of its portion extending in the width direction and overlapping the core wrap sheet in the thickness direction on the outside of the third region in the width direction. The absorbent article according to claim 3.

8. The portion of at least one of the plurality of first expandable members that is not overlapped with the core wrap sheet and the portion of at least one of the plurality of second expandable members that is not overlapped with the core wrap sheet are covered by the cover sheet. It is bonded and extends along the leg opening provided in the cover sheet, The absorbent article according to claim 1 or 2.

9. The plurality of second expandable members are arranged such that the entire second widening portion in the longitudinal direction is pulled outward in the width direction of the second widening portion, The absorbent article according to claim 1 or 2.

10. The portions of the plurality of first expandable members that overlap with the core wrap sheet contract in the width direction. The portion of the plurality of second expandable members that overlaps with the core wrap sheet contracts in the width direction. The absorbent article according to claim 1 or 2.

11. The portions of the plurality of first expandable members that do not overlap with the core wrap sheet and the portions of the plurality of second expandable members that do not overlap with the core wrap sheet are adhered to the cover sheet and extend along at least one of the width direction and the direction oblique to the width direction. The absorbent article according to claim 1 or 2.

12. The portions of the plurality of first expandable members that do not overlap with the core wrap sheet and the portions of the plurality of second expandable members that do not overlap with the core wrap sheet are adhered to the cover sheet and have portions that extend along the width direction and portions that extend diagonally with respect to the width direction. The angle between the portion of the plurality of first expandable members that does not overlap with the core wrap sheet, and the portion that extends along the width direction and the portion that extends along the diagonal direction, is 115 degrees or more and 145 degrees or less. The angle between the portion of the plurality of second expandable members that does not overlap with the core wrap sheet, and the portion that extends along the width direction and the portion that extends along the diagonal direction, is 115 degrees or more and 145 degrees or less. The absorbent article according to claim 1 or 2.

13. None of the plurality of expandable members are positioned on the outer side of the crotch area in the width direction near the boundary between the crotch area and the second widening portion. The absorbent article according to claim 1 or 2.

14. The plurality of expandable members further include one or more third expandable members, At least one of the ends of each of the third expandable members extends in the width direction and overlaps the core wrap sheet in the thickness direction on the outside of the crotch area in the width direction near the boundary between the first widening portion and the crotch area. The absorbent article according to claim 1 or 2.

15. The plurality of third expandable members are not superimposed on the absorption core in the thickness direction. The absorbent article according to claim 14.

16. All or more of each of the third expandable members extends in the width direction and overlaps the core wrap sheet in the thickness direction on the outside of the crotch area in the width direction near the boundary between the first widening portion and the crotch area. The absorbent article according to claim 14.

17. The portion of each of the third expandable members that overlaps with the core wrap sheet contracts in the width direction. The absorbent article according to claim 14.

18. The portion of each third expandable member that does not overlap with the core wrap sheet is adhered to the cover sheet and extends along the leg opening provided in the cover sheet. The absorbent article according to claim 14.

19. The portion of each third expandable member that does not overlap with the core wrap sheet is adhered to the cover sheet and extends in at least one of the width direction and a direction oblique to the width direction. The absorbent article according to claim 14.

20. The portion of each third expandable member that does not overlap with the core wrap sheet is adhered to the cover sheet and has a portion that extends along the width direction and a portion that extends diagonally with respect to the width direction. The angle between the portion of each third expandable member that does not overlap with the core wrap sheet, extending along the width direction, and the portion that extends along the diagonal direction, is between 115 degrees and 145 degrees. The absorbent article according to claim 14.

21. The distance between the plurality of first expandable members in the longitudinal direction is 5 mm or more. The distance between the plurality of second expandable members in the longitudinal direction is 5 mm or more. The absorbent article according to claim 1.

22. The longitudinal distance between the plurality of third expandable members is 5 mm or more. The absorbent article according to claim 14.

23. The plurality of expandable members further include one or more fourth expandable members extending in the width direction and one or more fifth expandable members extending in the width direction, The abdominal portion has an end located on the opposite side of the boundary between the abdominal portion and the first widened portion in the longitudinal direction, The back portion has an end located on the opposite side of the boundary between the back portion and the second widening portion in the longitudinal direction. The central portion of each of the fourth expandable members is positioned to overlap with the end of the abdomen in the thickness direction. The portions of each of the fourth expandable members other than the central portion are positioned outside the width direction of the end portion of the abdomen, The central portion of each of the fifth expandable members is positioned to overlap with the end of the back portion in the thickness direction. The portions of each of the fifth expandable members other than the central portion are positioned outside the width direction of the end of the back portion. The absorbent article according to claim 1 or 2.

24. The plurality of expandable members further include one or more sixth expandable members extending in the width direction and one or more seventh expandable members extending in the width direction, The abdominal portion has an end located on the opposite side of the boundary between the abdominal portion and the first widened portion in the longitudinal direction, The aforementioned back portion is located on the opposite side of the boundary between the back portion and the second widening portion in the longitudinal direction. It has an end portion that Each of the aforementioned sixth expandable members is not superimposed on the absorbent in the thickness direction and is positioned outside the width direction of the end of the abdominal portion. Each of the seventh expandable members is not superimposed on the absorber in the thickness direction and is positioned outside the end of the back portion in the width direction. The absorbent article according to claim 1 or 2.

25. The plurality of second expandable members overlap the absorption core in the thickness direction in the second widening portion. The absorbent article according to claim 1.

26. An interior body including the absorbent, The exterior body including the aforementioned cover sheet, An adhesive portion for bonding the interior body and the exterior body, having a plurality of linear adhesive portions that extend in the width direction and are spaced apart from each other in the longitudinal direction, Equipped with, Each of the plurality of linear adhesive portions does not overlap with the plurality of second expandable members in the thickness direction. The absorbent article according to claim 25.

27. An interior body including the absorbent, The exterior body including the aforementioned cover sheet, Equipped with, The plurality of first expandable members overlap the absorption core in the thickness direction in the first widening portion. A non-adhesive region is provided in the area where the plurality of first expandable members and the absorbing core overlap, in which the inner body and the outer body are not adhered. The absorbent article according to claim 1.

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