JP7033527B2 - Disposable diapers - Google Patents

Description

The present invention relates to a disposable diaper having a waistband.

Disposable diapers in which a waistband is arranged around the back waist are known (see, for example, Patent Document 1). The waistband has an upright portion configured to be upright and a base end portion serving as an upright fulcrum of the upright portion. The upright portion of the waistband rises to the wearer side and forms a storage space for accommodating excrement moving to the waist opening side.

Japanese Unexamined Patent Publication No. 2016-187510

Wearers wearing disposable diapers take various postures when wearing them. Depending on the posture, the position of wearing the disposable diaper may shift. In particular, infant wearers have a leaning forward posture in which their backs are curled up by pulling their legs toward the abdomen in a lying position and sucking or hugging their toes, resulting in a C-shaped outer line of the body. May take. In the forward leaning position, the skin on the back stretches compared to when the wearer does not pull his legs toward the abdomen. Therefore, even if the disposable diaper is properly worn at the time of wearing, the buttocks of the wearer are exposed in the forward bending posture, and the waistband cannot properly contain the excrement, which may cause leakage.

Further, particularly in the case of a tape-type disposable diaper, since the wearer performs an operation of stopping the fastening tape, the position of the fastening tape tends to differ depending on the wearer. Depending on the position where the fastening tape is stopped, the wearing condition for the wearer changes. Therefore, it is not possible to properly wear the disposable diaper, the buttocks of the wearer are easily exposed in the forward bending posture, the excrement cannot be properly stored by the waistband, and there is a risk of leakage.

Therefore, a disposable diaper that can maintain the initial position of the waistband even in a forward-bent posture and suppress leakage from the buttocks is desired.

The disposable diaper according to one embodiment includes an anterior-posterior direction and a width direction orthogonal to each other, an inseam region arranged between a front waist circumference region, a rear waist circumference region, and a front waist circumference region and a rear waist circumference region, and an absorption core. A skin surface side sheet located on the skin facing surface side of the absorption core, and a waist band located on the skin facing surface side of the skin surface side sheet in the rear waist circumference area and expanding and contracting in the width direction. The skin surface side sheet has a surface sheet and a pair of side sheets that cover the outer side portion of the surface sheet in the width direction. Each of the pair of side sheets constitutes a pair of leak-proof gathers, and the leak-proof gathers include a shrinkage portion that contracts due to the contraction of the leak-proof elastic member, and the contraction portion outside the contraction portion in the width direction. The waistband is a disposable diaper having a width fulcrum portion to be an upright fulcrum of the diaper, and the waistband is a disposable diaper having an upright portion configured to be upright and a base end portion to be an upright fulcrum of the upright portion. The end portion has an anterior-posterior proximal end portion having the upright portion and the anterior-posterior proximal edge adjacent to the anterior-posterior direction, and a width proximal end portion having the upright portion and the width proximal edge adjacent to the width direction. The upright portion is a diaper that is folded toward the skin surface with an extension portion extending in the front-rear direction from the front-rear base end edge and a crease located at the front-rear end edge of the extension portion as a base point. The width base edge has a contact portion, and the width base end edge is located outside the width direction from the width fulcrum portion, and the length of the skin contact portion in the front-rear direction in the extended state of the waistband. Let a be a, the length of the extension portion in the anteroposterior direction be b, and the distance in the anteroposterior direction from the anterior-posterior proximal edge to the posterior edge of the disposable diaper be c. Satisfy c.

FIG. 1 is a schematic plan view of the disposable diaper according to the first embodiment as viewed from the skin facing surface side. FIG. 2 is a schematic cross-sectional view taken along the line 2A-2A shown in FIG. FIG. 3 is a schematic cross-sectional view taken along the line 3A-3A shown in FIG. FIG. 4 is a schematic cross-sectional view taken along the line 4A-4A shown in FIG. 1 in the extended state. FIG. 5 is a schematic cross-sectional view taken along line 4A-4A shown in FIG. 1 in the natural state. FIG. 6 is a diagram schematically showing a wearing state in which the waistband is not extended in a cross section with reference to FIG. 4. FIG. 7 is a diagram schematically showing a wearing state in which the waistband is extended in a cross section with reference to FIG. FIG. 8 is a schematic side view of the wearer in a state in which the wearer bends the leg and a state in which the bent leg is returned to the original state. FIG. 9 is a diagram schematically showing a wearing state in which the waistband is not extended in a cross section based on FIG. 4 of the disposable diaper according to the modified example. FIG. 10 is a diagram schematically showing a wearing state in which the waistband is extended in a cross section based on FIG. 4 of the disposable diaper according to the modified example. FIG. 11 is a diagram showing a cross section of the disposable diaper according to the modified example with reference to FIG. 2.

(1) Outline of Embodiment At least the following matters will be clarified by the description of this specification and the accompanying drawings.
The disposable diaper according to one embodiment includes an anterior-posterior direction and a width direction orthogonal to each other, an inseam region arranged between a front waist circumference region, a rear waist circumference region, and a front waist circumference region and a rear waist circumference region, and an absorption core. A skin surface side sheet located on the skin facing surface side of the absorption core, and a waist band located on the skin facing surface side of the skin surface side sheet in the rear waist circumference area and expanding and contracting in the width direction. The skin surface side sheet has a surface sheet and a pair of side sheets that cover the outer side portion of the surface sheet in the width direction. Each of the pair of side sheets constitutes a pair of leak-proof gathers, and the leak-proof gathers include a shrinkage portion that contracts due to the contraction of the leak-proof elastic member, and the contraction portion outside the contraction portion in the width direction. The waistband is a disposable diaper having a width fulcrum portion to be an upright fulcrum of the diaper, and the waistband is a disposable diaper having an upright portion configured to be upright and a base end portion to be an upright fulcrum of the upright portion. The end portion has an anterior-posterior proximal end portion having the upright portion and the anterior-posterior proximal edge adjacent to the anterior-posterior direction, and a width proximal end portion having the upright portion and the width proximal edge adjacent to the width direction. The upright portion is a diaper that is folded toward the skin surface with an extension portion extending in the front-rear direction from the front-rear base end edge and a crease located at the front-rear end edge of the extension portion as a base point. The width base edge has a contact portion, and the width base end edge is located outside the width direction from the width fulcrum portion, and the length of the skin contact portion in the front-rear direction in the extended state of the waistband. Let a be a, the length of the extension portion in the anteroposterior direction be b, and the distance in the anteroposterior direction from the anterior-posterior proximal edge to the posterior edge of the disposable diaper be c. Satisfy c.

According to this aspect, the upright portion of the waistband stands up from the width base edge and the anterior-posterior base edge to form a pocket for accommodating excrement. At this time, the extending portion is deformed in a state where the skin contact portion is in contact with the skin according to the movement of the body, and the waistband follows the movement of the body. The maximum length of the upright portion in the anteroposterior direction is a + b, which is longer than the distance c in the anteroposterior direction from the anterior-posterior edge to the posterior edge of the disposable diaper. Therefore, in a state where the upright portion extends to the rearmost side, the upright portion extends to the rear side of the rear end edge of the disposable diaper. Further, the base point in the front-rear direction when the upright portion extends to the rear side is the front-back base point edge, and the base point in the width direction is the width base point edge. The width base end edge is located outside the width fulcrum in the width direction, and the upright portion of the waistband is difficult to lift in the thickness direction due to the contraction of the contraction portion of the leak-proof gather, and the upright portion is difficult to be pulled to the front side. Therefore, the position of the base point in the width direction of the upright portion is stable, and the upright portion can easily extend to the rear side. When the skin on the back is stretched in the forward-bent posture, the upright portion of the waistband extends, and it is easy to maintain the initial position before at least a part of the waistband takes the forward-bent posture. Therefore, it is possible to suppress the displacement of the entire waistband and suppress the leakage from the buttocks when the posture of bending forward is taken.

According to a preferred embodiment, the fastening tape has a locking portion that is fastened to the front waist circumference region, and the waistband is a region extending from the locking portion in the width direction in the extended state. May extend to the rear.

According to this aspect, the region extending in the width direction from the locking portion of the fastening tape is a region that is in close contact with the body when worn, and is generally arranged above the crack in the buttocks. The waistband is also arranged on the posterior side of the fastening tape in the extended state, and the upright portion of the waistband tends to extend to a position above the crevice of the buttocks, that is, a position farther than the buttocks when worn. The storage space for excrement by the waistband can be formed so as to be far from the buttocks, and leakage can be further suppressed.

According to a preferred embodiment, the waistband and the fastening tape may be separated in the width direction.

According to this aspect, since the waistband and the fastening tape do not overlap with each other, it is possible to reduce the discomfort caused by the overlapping portion of the waistband and the fastening tape hitting the skin, and it is possible to suppress the feeling of foreign matter when the waistband hits the skin.

According to a preferred embodiment, the erecting portion of the waistband has a band stretching region that expands and contracts in the width direction, and the band stretching region is provided in each of the skin contact portion and the extending portion. The dimension of the band expansion / contraction region in the skin contact portion in the anteroposterior direction may be larger than the dimension of the band expansion / contraction region in the extension portion in the anteroposterior direction.

According to this aspect, it is possible to easily increase the elongation stress of the skin contact portion with respect to the elongation stress of the extension portion. Therefore, the skin contact portion can easily follow the skin, and the initial position of the waistband can be maintained even in the forward bending posture, and leakage can be suppressed. Further, if the extension stress of the extension portion is too high, the extension portion rises too much, and it may be difficult to secure a storage space between the extension portion and the skin contact portion. However, it is possible to prevent the accommodation space between the extension portion and the skin contact portion from becoming smaller due to the contraction force of the extension portion becoming too large, and it is easy to secure the accommodation space.

According to a preferred embodiment, the leak-proof gather has a rear fulcrum portion that serves as an upright fulcrum of the contraction portion on the rear side of the contraction portion, and the rear fulcrum portion is in the thickness direction with the absorption core. It may be arranged in an overlapping area.

According to this aspect, when the contracted portion of the leak-proof gather is contracted, the rear fulcrum portion of the leak-proof gather is difficult to move to the front side due to the rigidity of the absorption core. By restricting the movement of the leak-proof gather to the front side of the rear fulcrum portion, the movement of the waistband to the front side can be suppressed. The initial position of the waistband can be maintained even in the forward leaning posture, and leakage can be suppressed.

According to a preferred embodiment, a main body expansion / contraction portion that expands / contracts in the width direction may be provided between the waist band and the fastening tape in the width direction.

According to this aspect, when the wearer pulls the leg toward the abdomen, the skin on the back stretches, and the position of the posterior waist circumference region with respect to the back shifts to the inseam region side. At this time, the skin of the abdomen does not stretch like the back, and the position of the anterior waist circumference region with respect to the abdomen does not easily shift to the inseam region side. Therefore, when the wearer pulls the leg toward the abdomen, the elastic portion of the main body extends between the fastening tape fixed to the front waist circumference area and the rear waist circumference area to which the fastening tape is fixed. When the wearer puts the leg pulled toward the abdomen back, the rear waist area moves to the waist opening side through the leg opening, but may not return to the initial position before raising the leg. At this time, the waistband can be pulled toward the waist opening side by the elastic part of the main body between the fastening tape and the waistband, and the rear waistband including the waistband becomes the same height as the front waistband. It becomes easy to return to the initial position. Therefore, it becomes easy to return the waistband to the initial position when the posture is returned after the forward bending posture.

According to a preferred embodiment, an embossed portion continuous in the front-rear direction may be formed in the region arranged on the rearmost side of the three regions obtained by dividing the absorption core into three equal parts in the front-rear direction.

According to this aspect, in the breastfeeding posture, the distance between the abdomen and the crotch is shortened, and the inseam area of the disposable diaper is pressed from the abdomen side. At this time, the region located in the center of the three regions in which the absorption core is divided into three equal parts in the front-rear direction is pressed, and the region located in the center of the three regions in which the absorption core is divided into three equal parts in the front-rear direction is pressed. Is pressed from the inseam side. At this time, the deformation of the central region is transmitted to the rearmost region. An embossed portion continuous in the front-rear direction is formed in the rearmost region, and the force transmitted from the central region is easily transmitted to the entire rear region. Therefore, it becomes easy to return the entire rear region to the original position, and it becomes easy to return the waistband to the initial position.

According to a preferred embodiment, the elongation stress of the skin contact portion in the width direction may be larger than the elongation stress of the extension portion.

According to this aspect, since the extension stress of the skin contact portion is large, it is possible to suppress the position of the rear waist circumference region from shifting with respect to the wearer's back, and the extension stress of the extension portion is small, so that excretion is performed. It is possible to prevent the space for accommodating objects from becoming smaller.

According to a preferred embodiment, in the region overlapping the absorption core in the thickness direction, the elastic body that contracts in at least one of the width direction and the front-rear direction is not arranged on the non-skin surface side of the absorption core. good.

According to this aspect, since the elastic body is not arranged on the non-skin surface side of the absorption core, it is difficult for the absorption core to be pressed against the skin surface side due to the contraction of the elastic body. Therefore, even if the position of the waistband in the front-rear direction shifts due to the forward bending posture, the waistband tends to return to the initial position.

(2) Overall Outline of Disposable Diaper The disposable diaper according to the embodiment will be described below with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic and the ratio of each dimension is different from the actual one. Therefore, the specific dimensions, etc. should be determined in consideration of the following explanation. In addition, there may be a portion where the relationship and ratio of the dimensions of the drawings are different from each other.

Disposable diapers are tape-type disposable diapers. FIG. 1 is a schematic plan view of the disposable diaper 10 according to the embodiment as viewed from the skin-facing surface side. FIG. 2 is a schematic cross-sectional view taken along the cross section of 2A-2A of the disposable diaper shown in FIG. FIG. 3 is a schematic cross-sectional view taken along the 3A-3A cross section of the disposable diaper shown in FIG. 1 to 3 show a disposable diaper in an extended state. The stretched state in the present invention is a state in which the disposable diaper 10 is stretched to a state in which wrinkles are not formed. Further, the natural state in the present invention means that, in the case of the disposable diaper 10 housed in the package, the disposable diaper 10 is taken out from the package and placed in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH. It has been left for 24 hours. FIG. 4 is a schematic cross-sectional view taken along the line 4A-4A shown in FIG. 1 in the extended state. FIG. 5 is a schematic cross-sectional view taken along line 4A-4A shown in FIG. 1 in the natural state. In the schematic cross-sectional views shown in FIGS. 2 to 5, for convenience of explanation, the members are shown separated in the thickness direction T, but in an actual product, they are in contact with the thickness direction T. 6 and 7 are views schematically showing a wearing state in a cross section with reference to FIG. 5. The BL shown in FIG. 6 shows the line of the wearer's body.

The disposable diaper 10 has an anteroposterior direction L and a width direction W orthogonal to each other. The anterior-posterior direction L is defined by the direction extending to the anterior side and the posterior side of the body. In other words, the anteroposterior direction L is a direction extending anterior-posteriorly in the deployed disposable diaper 10. Further, the disposable diaper 10 has both the front-rear direction L and the width direction W orthogonal to each other in the thickness direction T. The thickness direction T extends to the skin facing surface side T1 facing the wearer side and the non-skin facing surface side T2 opposite to the skin facing surface side T1.

The disposable diaper 10 has a front waist circumference area S1, a rear waist circumference area S2, and an inseam area S3. The front waist circumference area S1 is a region facing the front waist circumference (abdomen) of the wearer. The rear waist circumference area S2 is a region facing the rear waist circumference (back) of the wearer, and includes a region on which the body is placed when worn. The inseam area S3 is located in the inseam of the wearer and is an area arranged between the front waist area S1 and the rear waist area S2. The inseam area S3 is an area provided with a leg circumference opening 65 arranged around the wearer's leg circumference. The leg circumference opening 65 is a portion recessed inward in the width direction from the outer edge of the disposable diaper.

The disposable diaper 10 includes an absorption core 31 containing an absorbent material. The absorbent core 31 contains an absorbent material such as ground pulp or a highly absorbent polymer (SAP), or a mixture thereof. The absorption core 31 may be covered with a core wrap (not shown). The absorber may be composed of the absorption core 31 and the core wrap. The core wrap is made of tissue or SMS non-woven fabric and may be arranged on the skin-facing surface side T1 of the absorption core 31 and the non-skin-facing surface side T2 of the absorption core 31.

As shown in FIGS. 2 and 3, the disposable diaper 10 has a skin surface side sheet 20 located on the skin facing surface side T1 with respect to the absorption core 31. The skin-side sheet 20 covers the absorbent core 31 and is arranged over the entire disposable diaper 10. The skin surface side sheet 20 of the present embodiment includes a surface sheet 21 and a pair of side sheets 22. In the disposable diaper having a core wrap, the skin surface side sheet 20 is a sheet located on the skin facing surface side T1 with respect to the core wrap. The surface sheet 21 may be arranged so as to straddle the center of the absorption core 31 in the width direction W. The side sheet 22 may be arranged so as to cover both outer portions of the surface sheet 21. The surface sheet 21 and the side sheet 22 may be made of a liquid-permeable sheet such as a non-woven fabric or a perforated plastic film.

Each of the pair of side seats 22 may form a leak-proof gather 60. The leak-proof gather 60 has a contraction portion 63 and a fulcrum portion 64, and may be separated from each other to the left and right. The inner portions of the side seats 22 may be folded back and overlapped. A leak-proof elastic member 61 that expands and contracts in the front-rear direction L may be provided between the overlapping side sheets 22. The leak-proof elastic member 61 may be made of a rubber thread that expands and contracts in the front-rear direction L. The contraction portion 63 of the leak-proof gather stands up on the skin-facing surface side T1 due to the shrinkage of the leak-proof elastic member 61, and forms a wall to prevent lateral leakage on the side of the center of the disposable diaper 10 in the width direction. The fulcrum portion 64 serves as an upright fulcrum of the contraction portion 63. The side sheet 22 and the surface sheet 21 are joined to the fulcrum portion 64. The contracted portion 63 is a portion in which the side sheet 22 is not joined to the surface sheet 21 and can be contracted by the leak-proof elastic member 61, and does not include a portion in which the non-extended leak-proof elastic member 61 is arranged. The fulcrum portion 64 has a rear fulcrum portion 64A located on the rear side of the contraction portion 63, a width fulcrum portion 64B located on the outside of the contraction portion 63 in the width direction W, and a front portion located on the front side of the contraction portion 63. It has a fulcrum portion 64C and.

Here, the outer portion in the present invention is a portion that occupies a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is the outer edge in the width direction W. Further, the inner portion is a portion that occupies a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is an inner edge in the width direction W.

The disposable diaper 10 has a non-skin surface side sheet 25 located on the non-skin facing surface side T2 with respect to the absorption core 31. The non-skin side sheet 25 covers the absorbent core 31 and is arranged throughout the disposable diaper. The non-skin surface side sheet 25 of the present embodiment includes a back surface sheet 23 and an exterior sheet 24. In the disposable diaper having a core wrap, the non-skin surface side sheet 25 is a sheet located on the non-skin facing surface side T2 with respect to the core wrap. The back surface sheet 23 is a liquid-impermeable sheet, and a breathable resin film is bonded to a polyethylene sheet, a laminated non-woven fabric mainly made of polypropylene, a breathable resin film, a spunbond, or a non-woven fabric such as spunlace. A sheet or the like can be used. The exterior sheet 24 may be provided on the non-skin facing surface side T2 of the back surface sheet 23. The exterior sheet 24 may be made of a liquid-permeable non-woven fabric. The length of the back surface sheet 23 in the width direction W is shorter than the length of the exterior sheet 24 in the width direction W, and the length of the back surface sheet 23 in the front-rear direction L is shorter than the length of the exterior sheet 24 in the front-rear direction L. good.

A fastening tape 90 is provided in the rear waist circumference region S2. The fastening tape 90 has a base portion 92 and a locking portion 93. At least a part of the base portion 92 is joined between the skin surface side sheet 20 and the non-skin surface side sheet 25, and extends from the skin surface side sheet 20 and the non-skin surface side sheet 25 to the outside in the width direction W. .. The locking portion 93 is provided on the base portion 92 and is detachably fastened to the target portion 95 (see FIG. 1) of the front waist circumference region S1. The fastening tape 90 extends along the width direction W in the rear waist circumference region S2 and is fastened to the target portion 95 to hold the disposable diaper 10 on the wearer's body. The target portion 95 is arranged in the front waist circumference region S1 and is configured so that the fastening tape 90 is fixed to each other.

The disposable diaper 10 has a waist band 80 arranged on the skin facing surface side T1 of the skin surface side sheet 20 in the rear waist circumference region S2. The waist band 80 is configured to be able to stand up with respect to the main body portion 10A. The main body portion 10A includes the skin surface side sheet 20 and is arranged on the skin facing surface side T1 of the skin surface side sheet 20. The main body 10A is composed of members other than the waistband 80 in the disposable diaper 10. The waistband 80 is configured to be stretchable in the width direction and rises from the skin surface side sheet 20 when worn to form a first pocket P1 for accommodating excrement. The first pocket P1 accommodates excrement moving toward the waist opening 66 side and constitutes the pocket of the present invention. The configuration of the waistband 80 will be described in detail later. The waist opening 66 is composed of a rear end edge 10R and a front end edge 10F of a disposable diaper, and is a portion surrounding the waist while the fastening tape 90 is attached to the target portion 95.

A leg elastic member 42 extending in the front-rear direction L may be provided between the side sheet 22 and the back surface sheet 23, or between the side sheet 22 and the exterior sheet 24. The leg circumference elastic member 42 may be composed of a strip-shaped elastic sheet that expands and contracts in the front-rear direction L. Due to the contraction of the leg circumference elastic member 42, the disposable diaper 10 fits around the leg circumference when worn. The leg circumference elastic member 42 is arranged along the leg circumference opening 65 at least in the inseam region S3 outside the absorption core 31 in the width direction W. The leg circumference elastic member 42 is arranged between the exterior sheet 24 and the side sheet 22, and between the back surface sheet 23 and the side sheet 22.

A waist elastic member 45 extending in the width direction W may be provided between the side sheet 22 and the back surface sheet 23, and between the side sheet 22 and the exterior sheet 24. The waist elastic member 45 may be composed of a substantially rectangular elastic sheet that expands and contracts in the width direction W. The waist elastic member 45 is joined between the skin surface side sheet 20 and the non-skin surface side sheet 25. More specifically, as shown in FIG. 4, the waist elastic member 45 is in a state of being extended in the width direction W, between the absorption core 31 and the non-skin side sheet 25, or between the skin side sheet 20 and the non-skin side sheet 20. It is joined between the face side sheets 25. Due to the contraction of the elastic member 45 around the waist, the disposable diaper 10 fits around the waist when worn. The waist elastic member 45 is arranged at least in the rear waist circumference region S2.

(3) Configuration of Waistband Next, the configuration of the waistband 80 will be described in detail. As shown in FIGS. 2 and 5, the waistband 80 may be configured by folding the sheet material 81. A plurality of sheets may be laminated on the sheet material 81. The waist band 80 may have a band elastic member 82 joined to the sheet material 81. In another embodiment, the waist band 80 does not have the band elastic member 82, and the sheet material 81 itself may have elasticity. The sheet material 81 of the waistband 80 of the present embodiment includes a first nonwoven fabric layer 811 and a second nonwoven fabric layer 812, and a film layer 813 arranged between the first nonwoven fabric layer 811 and the second nonwoven fabric layer 812. include. The first nonwoven fabric layer 811 and the second nonwoven fabric layer 812 constitute the nonwoven fabric layer of the present invention. The first nonwoven fabric layer 811 and the second nonwoven fabric layer 812 are made of the same nonwoven fabric and are folded at the apex of the folded portion 86 of the waistband 80. The first nonwoven fabric layer 811 is located on the skin surface side sheet 20 side of the waistband 80. In another form, the waistband 80 may be composed of only the film layer 813, or may be composed of only the film layer 813 and the first nonwoven fabric layer 811. The first nonwoven fabric layer 811 and the second nonwoven fabric layer 812 may be composed of different nonwoven fabrics.

The band elastic member 82 is composed of a thread-shaped or band-shaped elastic member, and is fixed to the sheet material 81 in a state of being extended in the width direction W. The band elastic member 82 of the present embodiment is fixed between the first nonwoven fabric layer 811 and the film layer 813. A plurality of band elastic members 82 are arranged at intervals in the front-rear direction L. A plurality of band elastic members 82 are arranged in the facing portion 83 and the folded portion 86, which will be described later.

Therefore, the waistband 80 is configured to be expandable and contractible in the width direction W. The waist band 80 may be configured to expand and contract in the width direction by the band elastic member 82, or may be configured to expand and contract in the width direction due to the sheet material having elasticity. The waistband 80 may be configured such that at least the upright portion is contractible, and the entire upright portion and the base end portion may be configured to be contractible.

The waist band 80 has an opposed portion 83 located on the skin surface side sheet 20 side of the waist band 80. The facing portion 83 is a portion that can come into contact with the skin surface side sheet 20, and is a portion that includes the sheet material 81 located most on the skin surface side sheet 20 side and is not folded back from the crease FL as a base point. It is composed of. The crease FL is located at the front end edge of the facing portion 83. The facing portion 83 of the present embodiment is a portion that is not folded back with respect to the crease FL, and is located behind the crease FL. In FIG. 4, the facing portion 83 is shown with diagonal lines.

The waistband 80 has a folded portion 86 that is folded back with respect to the facing portion 83. The folded-back portion 86 is folded toward the rear side and the skin surface side with the crease FL as a base point. The folded-back portion 86 is a portion of the waistband that is not shaded in FIG.

The waist band 80 has an upright portion 85 configured to be upright with respect to the skin surface side sheet 20, and a base end portion serving as an upright fulcrum of the upright portion 85. The upright portion 85 has an extension portion 88 provided on the facing portion 83 and a skin contact portion 89 provided on the folded portion 86. The base end portion includes a front-rear base end portion 84 having a front-rear base end edge adjacent to the upright portion 85 in the front-rear direction, and a width base end portion 87 having a width base end edge adjacent to the upright portion 85 in the width direction. Have.

The front-rear base end portion 84 is provided on the facing portion 83 and is located at the rear end portion of the waistband. The front-rear base end edge serves as an upright fulcrum of the upright portion 85 (extending portion 88). The front-rear base end edge is a boundary between the front-rear base end portion 84 and the extension portion 88, and is adjacent to the extension portion 88 in the front-rear direction. The front-rear base end edge is composed of a front end edge 84F (see FIG. 4) of the front-rear base end portion 84. The front-rear base end portion 84 extends rearward from the front-rear base end edge. The trailing edge 84R of the front-rear base end 84 may extend to the trailing edge 80R of the waistband 80 and may coincide with the trailing edge 10R of the disposable diaper 10.

The width base end portion 87 may have a first width base end portion 871 provided on the facing portion 83 and a second width base end portion 872 provided on the skin contact portion 89. The first width base end portion 871 is joined to the skin surface side sheet 20 and serves as an upright fulcrum of the upright portion 85 (extending portion 88). The first width base end edge is a boundary between the first width base end portion 871 and the extension portion 88, and is adjacent to the extension portion 88 in the width direction. The first width base end edge is composed of the inner edge 871I (see FIG. 2) of the first width base end portion 871. The first width base end portion 871 is arranged so as to be separated from each other on the left and right sides. The extending portion 88 as an upright portion stands up against the skin surface side sheet 20 with the first width base end edge and the front-back base end edge as base points.

As shown in FIGS. 5 and 6, the space sandwiched between the extending portion 88 as the upright portion 85 and the skin surface side sheet 20 forms a first pocket P1 that opens toward the front side. As shown in FIG. 4, the length b in the front-rear direction of the extension portion 88 in the extended state is the distance between the front end edge 84F of the front-rear base end portion 84 and the crease FL. The length of the extension portion 88 in the width direction is the distance between the pair of first width base end portions 871. The first pocket P1 can accommodate excrement diffused from the inseam region S3 side to the waist opening 66 side. The trailing edge of the first pocket P1 is the front edge 84F of the anterior-posterior proximal end 84, and the outer edge of the first pocket P1 is the inner edge 871I of the first width proximal edge 871. That is, the front end edge of the first pocket P1 becomes the front end edge of the extending portion 88.

The second width base end portion 872 is joined to the facing portion 83 and serves as an upright fulcrum of the upright portion 85 (skin contact portion 89). The second width base end edge is a boundary between the second width base end portion 872 and the skin contact portion 89, and is adjacent to the skin contact portion 89 in the width direction. The second width base end edge is composed of the inner edge 872I (see FIG. 2) of the second width base end portion 872. The second width base end portion 872 is arranged so as to be separated from each other on the left and right sides. The second width base end portion 872 is provided in pairs on both side portions of the folded portion 86 in the width direction. The folded-back portion 86 of the region between the pair of second width base end portions 872 constitutes an upright portion 85 (skin contact portion 89) that stands upright on the wearer side with respect to the facing portion 83. The skin contact portion 89 as an upright portion stands up against the skin surface side sheet with the second width base end edge and the crease FL as base points.

The skin contact portion 89 extends rearward from the front end edge 83F of the facing portion 83. In the extended state, the trailing edge 89R of the skin contact portion 89 may coincide with the trailing edge 83R of the facing portion 83, or may be on the front side of the trailing edge 83R of the facing portion 83. , It may be on the rear side of the rear end edge 83R of the facing portion 83. In the present embodiment, the trailing edge 89R of the skin contact portion 89 and the trailing edge 83R of the facing portion 83 coincide with each other in the front-rear direction L.

A skin contact surface 89A is formed on at least a part of the skin contact portion 89. The skin contact surface 89A is a surface of the waistband located closest to the skin surface, and is a surface that abuts on the wearer's skin. The waistband according to the modified example may be folded to the side away from the skin surface side sheet 20 with the crease extending in the width direction W at the rear end edge 89R of the skin contact portion 89 as a base point. In the modified example, the further folded portion also constitutes the skin contact portion 89.

The folded portion 86 and the skin contact portion 89 form a second pocket P2 that opens on the waist opening 66 side. As shown in FIG. 4, the length a in the front-rear direction of the skin contact portion 89 in the extended state is the distance between the trailing end edge 89R of the skin contact portion and the crease FL. The length of the skin contact portion 89 in the width direction is the distance between the pair of second width base end portions 872. As shown in FIG. 6, when the facing portion 83 separates from the body while the skin contact portion 89 is in contact with the skin in the wearing state, the space of the second pocket P2 is deformed by the movement of the body. For example, when the waist opening 66 is separated from the wearer's body, for example, when the wearer is in a forward-bent posture, the space between the folded-back portion 86 and the facing portion 83 expands, and the upright portion 85 of the waistband 80 is attached to the body. It becomes easier to follow. Therefore, leakage of excrement to the waist opening 66 side can be suppressed.

The width base end edge may be located outside the width fulcrum portion 64B of the leakage-proof gather 60 in the width direction. In the configuration having the first width base end edge 871I and the second width base end edge 872I constituting the width base end edge as in the present embodiment, the first width base end edge 871I and the second width base edge are used. It is sufficient that at least one of the edge edges 872I is located outside the width fulcrum portion 64B in the width direction. Further, at least one of the pair of first width proximal edges 871I may be located outside the width fulcrum portion 64B of the leakage-proof gather 60 in the width direction, and the pair of second width proximal edges 872I may be located outside. At least one of them may be located outside the width fulcrum portion 64B of the leakage-proof gather 60 in the width direction.

The upright portion of the waistband stands up from the width base edge and the anterior-posterior base edge to form a pocket. Specifically, the first pocket P1 is formed by standing up from the first width proximal edge and the front-rear proximal edge, and the first pocket P1 is formed by standing up from the second width proximal edge and the first crease FL. Form two pockets P2. At this time, the extending portion 88 is deformed in a state where the skin contact surface 89A of the skin contact portion 89 is in contact with the skin according to the movement of the body, and the waist band 80 follows the movement of the body. When the upright portion extends to the rear side, the base point in the front-rear direction is the front-back base point edge, and the base points in the width direction are the first width base end edge and the second width base end edge. At least one of the first width proximal edge and the second width proximal edge is located outside the width fulcrum 64B in the width direction, and the waistband stands up in the thickness direction due to the contraction of the contraction portion of the leakage-proof gather. The part is hard to lift up, and the standing part is hard to pull to the front side. When the skin on the back is stretched in the forward-bent posture, the upright portion of the waistband extends, and it is easy to maintain the initial position before at least a part of the waistband takes the forward-bent posture. Therefore, it is possible to suppress the displacement of the entire waistband and suppress the leakage from the buttocks when the posture of bending forward is taken.

As shown in FIG. 4, in the extended state of the waistband, the length of the skin contact portion in the anteroposterior direction is a, the length of the extension portion in the anteroposterior direction is b, and the back of the disposable diaper is set from the anterior-posterior edge. Assuming that the distance to the edge in the front-rear direction is c, a + b> c is satisfied. For example, when the skin of the buttocks is stretched by the wearer in a forward bending posture or the like, as shown in FIG. 7, the extending portion is deformed so as to extend posteriorly from the crease, and the waistband extends posteriorly. .. At this time, the maximum length of the upright portion (extended portion + skin contact portion) in the anteroposterior direction is a + b, which is longer than the distance c in the anteroposterior direction from the anterior-posterior proximal edge to the posterior edge of the disposable diaper. Therefore, in a state where the upright portion extends to the rearmost side, the upright portion extends to the rear side of the rear end edge of the disposable diaper. Therefore, the standing portion extends beyond the rear end edge of the disposable diaper to the rear side, and the initial position of the waistband can be maintained even in the forward bending posture, and leakage can be suppressed.

The waist band 80 may be arranged in the vicinity of the waist opening 66 in the rear waist circumference region S2. The front edge 80F of the waistband 80 may be located posterior to the front edge 90F of the fastening tape 90. The trailing edge 80R of the waistband may match the trailing edge 10R of a disposable diaper. The outer edge 80E of the waistband 80 may be located on the outer side of the outer edge 31E of the absorption core 31 in the width direction, and may be located on the inner side of the inner edge of the fastening tape 90 in the width direction. That is, the waistband 80 and the fastening tape 90 may be separated from each other in the width direction W. Since the waistband 80 and the fastening tape 90 do not overlap with each other, it is possible to reduce the discomfort caused by the overlapping portion of the waistband 80 and the fastening tape 90 hitting the skin, and it is possible to suppress the feeling of foreign matter when the waistband hits the skin. The front end edge 84F of the front-rear base end portion 84 may be located on the rear side of the rear end edge 31R of the absorption core 31 in the extended state, or may coincide with the rear end edge 31R of the absorption core 31. In the disposable diaper 10 of the present embodiment, the rear end edge 84R of the front-rear base end portion 84, the rear end edge 83R of the facing portion 83, the rear end edge 80R of the waistband, and the rear end edge 10R of the disposable diaper 10 are front and rear. The positions in the direction L match.

The waistband 80 may extend to the rear side of the locking region R93 extending in the width direction from the locking portion 93 of the fastening tape. In FIG. 1, the locking region R93 is shown with diagonal lines. The trailing edge of the locking region R93 is the trailing edge of the locking portion 93, and the front edge of the locking region R93 is the front edge of the locking portion 93. The locking region R93 is a region that comes into close contact with the body when worn, and is generally arranged above the crevice in the buttocks. The waistband 80 is also arranged on the posterior side of the locking region R93 in the extended state, and the upright portion of the waistband 80 tends to extend to a position above the crevice of the buttocks, that is, a position farther from the buttocks when worn. The space for accommodating excrement by the waistband 80 can be formed so as to be far from the buttocks, and leakage can be further suppressed. The upright part of the waistband is easier to extend to the rear than the area that comes into close contact with the body when worn. The storage space for excrement by the waistband can be formed so as to be far from the buttocks, and leakage can be further suppressed.

The upright portion 85 of the waist band 80 has a band expansion / contraction region R80 that expands / contracts in the width direction. The band expansion / contraction region R80 is a region that contracts in the width direction due to the band elastic member. The band expansion / contraction region R80 is provided on both the extending portion 88 and the skin contact portion 89. In FIGS. 2 and 4, the band expansion / contraction region R80 is shown.

As shown in FIG. 1, in the front-rear direction, the center of the band expansion / contraction region and the center of the fastening tape are deviated from each other. Specifically, the anteroposterior center of the waistband and the anteroposterior center of the band stretch region R80 may be posterior to the anteroposterior center of the fastening tape 90. Here, the center of the fastening tape in the front-rear direction is the center of the entire fastening tape including the locking portion 93 and the base portion 92. When the fastening tape is pulled outward in the width direction during mounting, the band expansion / contraction region is pulled outward in the width direction via the fastening tape.

In the disposable diaper of the present embodiment, the waist band 80 is arranged on the rear side, and the center of the fastening tape 90 and the center of the band expansion / contraction region are easily displaced in the front-rear direction. Therefore, when the fastening tape is pulled outward in the width direction, stress is not evenly generated over the entire area in the front-rear direction of the region extending in the width direction from the fastening tape, and in the region extending in the width direction from the fastening tape 90, the stress is not generated evenly. A stress difference occurs.

At this time, since the fastening tape 90 and the waistband 80 are separated from each other in the width direction, the force is not directly transmitted to the waistband 80 via the fastening tape 90, and the stress difference in the band expansion / contraction region R80 is relaxed and the fastening tape. It becomes easy to be transmitted to. Therefore, it is possible to suppress the problem that the fastening tape is difficult to be pulled outward in the width direction due to the stress difference in the band expansion / contraction region.

The rear fulcrum portion 64A of the leakage-proof gather 60 may be arranged in a region overlapping the absorption core 31 in the thickness direction T. When the contracted portion 63 of the leak-proof gather 60 contracts, the rear fulcrum portion 64A of the leak-proof gather 60 is pulled forward. At this time, the rear fulcrum portion 64A overlaps with the absorption core 31, and it is difficult to move to the front side due to the rigidity of the absorption core 31. Further, if the rear fulcrum portion 64A is arranged on the rear side of the absorption core 31, the region between the rear fulcrum portion 64A and the absorption core 31 may be bulged, and the rear fulcrum portion 64A may move to the front side. When the rear fulcrum portion 64A of the leak-proof gather 60 moves to the front side, the entire rear end edge 10R of the disposable diaper moves to the front side, and the waistband 80 also easily moves to the front side. When the rear fulcrum portion 64A is arranged in the region overlapping with the absorption core 31 in the thickness direction T, the rear fulcrum portion 64A is moved to the front side of the waistband in order to restrict the movement of the rear fulcrum portion 64A to the front side of the leakage-proof gather 60. The initial position of the waistband 80 can be maintained even in the forward bending posture, and leakage can be suppressed.

A body expansion / contraction portion that expands / contracts in the width direction may be provided between the waistband and the fastening tape in the width direction. The body expansion / contraction portion may be composed of a waist elastic member 45. It suffices if the waist elastic member 45 is arranged at least a part between the waistband and the fastening tape in the width direction. FIG. 8 is a schematic side view of the wearer in a state in which the wearer bends the leg and a state in which the bent leg is returned to the original state. As shown in FIG. 8A, when the wearer pulls the leg toward the abdomen, the skin on the back stretches, and the position of the posterior waist circumference region with respect to the back shifts to the inseam region side. At this time, the skin of the abdomen does not stretch like the back, and the position of the anterior waist circumference region with respect to the abdomen does not easily shift to the inseam region side. When the wearer pulls his legs toward the abdomen, the position of the fastening tape that is fixed to the front waist area is difficult to shift, so the fastening tape that is fixed to the front waist area and the rear waist area where the fastening tape is fixed. The waist elastic member 45 extends between S2.

Then, as shown in FIG. 8B, when the wearer returns the leg pulled toward the abdomen side, the rear waist circumference region S2 moves to the waist opening 66 side via the leg circumference opening 65. It may not return to the initial position before raising the leg. At this time, the waistband can be pulled toward the waist opening 66 side by the elastic portion of the main body between the fastening tape and the waistband so that the waistband is set to the same height as the front waistband. It becomes easy to return to the initial position. Therefore, it becomes easy to return the waistband to the initial position when the posture is returned after the forward bending posture.

As shown in FIG. 1, in the region arranged on the rearmost side of the three regions obtained by dividing the absorption core 31 into three equal parts in the front-rear direction, an embossed portion 32 continuous in the front-rear direction may be formed in the region. .. When the wearer pulls the leg toward the abdomen in a breastfeeding posture or the like, the skin on the back stretches, and the position of the posterior waist circumference region S2 with respect to the back shifts to the inseam region side. At this time, the skin in the abdomen does not stretch like the back, and the position of the anterior waist circumference region S1 is unlikely to shift to the inseam region S3 side. However, in the breastfeeding posture, the distance between the abdomen and the crotch becomes short, and the inseam area of the disposable diaper is also pressed from the abdomen side. At this time, the region located in the center of the three regions obtained by dividing the absorption core 31 into three equal parts in the front-rear direction is pressed from the inseam side. At this time, the deformation of the central region is transmitted to the rearmost region. An embossed portion 32 that is continuous in the front-rear direction is formed in the rearmost region, and the force transmitted from the central region is easily transmitted to the entire rear region. Therefore, it becomes easy to return the entire rear region to the original position, and it becomes easy to return the waistband 80 to the initial position.

The elongation stress in the width direction of the skin contact portion 89 may be larger than the elongation stress of the extension portion 88. Since the elongation stress of the skin contact portion is large, it is possible to prevent the position of the rear waist circumference region from shifting with respect to the wearer's back. Further, if the extension stress of the extension portion 88 is too high, the extension portion 88 may rise too much, and it may be difficult to secure a storage space between the extension portion 88 and the skin contact portion 89. However, since the elongation stress of the extending portion is small, it is possible to suppress the space for accommodating excrement from becoming small. Further, it is possible to prevent the accommodation space between the extension portion 88 and the skin contact portion 89 from becoming small due to the contraction force of the extension portion 88 becoming too large, and it is easy to secure the accommodation space.

An autograph type tensile tester (for example, AG-1KN1) manufactured by Shimadzu Corporation was used for measuring the elongation stress of the skin contact portion 89 and the extension portion 88. First, the width of the extended portion 88 and the skin contact portion 89 of the waistband is extended to the extent that gathers due to the contraction action of each band elastic member 82 are eliminated on the surface of the rear waist circumference region S2 of the disposable diaper 10. After measuring the dimension in the direction, each of the skin contact portion 89 and the extension portion 88 is cut at that dimension by a cutter. The extending portion 88 and the skin contact portion 89 were cut out so as to include the band elastic member 82 and used as a sample. Next, one end of each sample is sandwiched between a fixed chuck and the other end with a movable chuck, and the sample is stretched to a size of about 90% of the initial size at a speed of 300 mm / min and then inverted to obtain about 75% of the initial size. The tensile load (N) when each sample was contracted to the size was obtained and converted into the stress (N / mm) per unit width (mm) to obtain the elongation stress.

The dimension of the band expansion / contraction region R80 in the skin contact portion 89 in the front-rear direction L may be larger than the dimension in the front-rear direction of the band expansion / contraction region R80 in the extension portion 88. It is possible to easily increase the elongation stress of the skin contact portion 89 with respect to the elongation stress of the extension portion 88. Therefore, the skin contact portion 89 can easily follow the skin, maintain the initial position of the waistband 80 even in the forward bending posture, and suppress leakage.

In the disposable diaper according to the modified example, an elastic body (for example, a waist elastic member 45) that contracts in at least one of the width direction W and the front-back direction L is larger than the absorption core 31 in the region overlapping the absorption core 31 in the thickness direction. It does not have to be placed on the non-skin side. Since the elastic body is not arranged on the non-skin surface side of the absorption core 31, it is difficult for the absorption core to be pressed against the skin surface side due to the contraction of the elastic body. Therefore, even if the position of the waistband 80 in the front-rear direction L is displaced, the waistband 80 tends to return to the initial position. Preferably, in the rear waistband region where the waistband 80 is arranged, the elastic body is not arranged on the non-skin surface side of the absorption core 31, and more preferably, in the region where the waistband 80 and the absorption core 31 overlap. The elastic body is not arranged on the non-skin surface side of the absorption core 31. It is possible to further prevent the waistband 80 from being pressed against the skin surface side due to the contraction of the elastic body.

Next, the disposable diaper 10X according to the modified example will be described with reference to FIGS. 9 to 11. In the following description of the modified example, the same reference numerals will be used for the same configurations as those in the embodiment, and the description thereof will be omitted. The disposable diaper according to the modified example has a waistband configuration different from that of the embodiment, but other configurations are the same as those of the embodiment.

FIG. 9 is a diagram schematically showing a wearing state in which the waistband 80X does not extend in a cross section based on FIG. 4 of the disposable diaper according to the modified example. FIG. 10 is a diagram schematically showing a wearing state in which the waistband 80X is extended in a cross section based on FIG. 4 of the disposable diaper according to the modified example. FIG. 11 is a diagram showing a cross section of the disposable diaper according to the modified example with reference to FIG. 2.

The upright portion 85X of the waistband 80X according to the modified example is provided in the extending portion 88X, and the front-rear base end portion 84X is provided in the facing portion 83X. The upright portion 85X of the waistband 80X is folded back to the front side and the skin surface side with the first fold FL1 located at the rear end edge of the front and rear base end portion 84X as the base point, and further to the rear side and the skin surface with the second fold FL2 as the base point. It is folded back to the side. The extending portion 88X is provided between the first fold FL1 and the second fold FL2. The skin contact portion 89X is provided on the rear side of the second fold FL2.

Further, as shown in FIG. 11, the width base end portion includes a third width base end portion 873 provided in the extending portion 88X and a fourth width base end portion 874 provided in the skin contact portion 89X. Has. The extending portion 88X is joined to the facing portion 83X at the third width base end portion 873, and the skin contact portion 89X is joined to the facing portion 83X at the fourth width base end portion 874. The upright fulcrum of the extending portion 88X in the width direction is composed of the inner edge 873I of the third width base end portion 873, and the upright fulcrum of the skin contact portion 89X in the width direction is the fourth width base end portion 874. It is composed of an inner edge 874I.

The upright portion 85X of the waistband 80 stands up from the width proximal edge and the anterior-posterior proximal edge to form a pocket. As shown in FIGS. 9 and 10, the extending portion 88X as the upright portion 85X stands up against the facing portion 83X with the third width base end edge and the front-back base end edge as the base points. The space sandwiched between the extending portion 88X and the facing portion 83X forms a first pocket P1 that opens toward the front side. Further, as the standing portion 85X, the skin contact portion 89X stands up against the extending portion 88 with the fourth width base end edge and the second fold FL2 as the base points. The space sandwiched between the protruding portion 88X of the standing portion and the skin contact portion 89X forms a second pocket P2 that opens toward the rear side.

As shown in FIG. 8, in the wearing state, the extending portion 88X stands up against the facing portion 83X, and the skin contact portion 89X stands up against the extending portion 88X. The front-rear base end edge, which is an upright fulcrum in the front-back direction of the upright portion 85X, is composed of the rear end edge of the front-rear base end portion 84X. Therefore, the maximum length of the upright portion (extended portion 88 + skin contact portion 89) in the front-rear direction is a1 + b1. The distance c1 in the front-rear direction from the front-rear base edge to the rear-end edge of the disposable diaper is shorter than a1 + b1. Further, the width base end edge according to the modified example is located outside the width fulcrum portion 64B of the leakage-proof gather 60 in the width direction. At least one of the third width proximal edge and the fourth width proximal edge may be located outside the width fulcrum portion 64B in the width direction.

Although the present invention has been described in detail using the above-described embodiments, it is clear to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and modifications without departing from the spirit and scope of the present invention as determined by the description of the scope of claims. Therefore, the description of the present specification is for the purpose of exemplary explanation and does not have any limiting meaning to the present invention.

According to the present invention, it is possible to provide a disposable diaper that can maintain the initial position of the waistband even in a forward bending posture and suppress leakage from the buttocks.

10, 10X: Disposable diaper 10F: Front edge of disposable diaper 10R: Rear edge of disposable diaper 20: Skin side sheet 21: Surface sheet 22: Side sheet 31: Absorption core 31E: Absorption core outer edge 31R: Absorption core Rear end edge 32: Embossed portion 45: Waist circumference elastic member 60: Leakage-proof gather 61: Leakage-proof elastic member 64A: Rear fulcrum portion 64B: Width fulcrum portion 65: Leg circumference opening 66: Waist opening 80, 80X: Waist Band 80F: Front edge of waist band 80R: Rear edge of waist band 81: Sheet material 811: First non-woven fabric layer 812: Second non-woven fabric layer 813: Film layer 82: Band elastic member 84: Front and rear base end 84F: Front and rear Front edge of the base end (front and back base edge)
85: Standing part 86: Folded part 86R: Rear end edge of folded part 871: First width base end part (width base end part)
872: Second width base end (width base end)
873: Third width base end (width base end)
874: Fourth width base end (width base end)
90: Fastening tape 93: Locking part FL: Fold FL1: First fold FL2: Second fold P1: First pocket P2: Second pocket S1: Front waist area S2: Rear waist area S3: Inseam area T: Thickness Direction T1: Skin facing surface side T2: Non-skin facing surface side L: Front-back direction W: Width direction

Claims (9)

In the front-back direction and width direction that are orthogonal to each other,
The front waist area, the rear waist area, and the inseam area arranged between the front waist area and the rear waist area, and the inseam area.
Absorption core and
The skin surface side sheet located on the skin facing surface side of the absorption core,
In the rear waist circumference area, a waist band located on the skin facing surface side with respect to the skin surface side sheet and expanding and contracting in the width direction,
With the fastening tape arranged in the rear waist circumference area,
The skin surface side sheet includes a surface sheet and a pair of side sheets that cover the outer side portion of the surface sheet in the width direction.
Each of the pair of side sheets constitutes a pair of leak-proof gathers.
The leakage-proof gather has a contraction portion that contracts due to the contraction of the leakage-proof elastic member, and a width fulcrum portion that serves as an upright fulcrum of the contraction portion outside the contraction portion in the width direction.
The waistband is a disposable diaper having an upright portion configured to be upright and a base end portion serving as an upright fulcrum of the upright portion.
The base end portion includes a front-rear base end portion having an upright portion and an anteroposterior proximal edge adjacent to the anterior-posterior direction, and a width proximal end portion having a width proximal end edge adjacent to the upright portion and the width direction. Have,
The upright portion includes an extension portion extending in the front-rear direction from the front-rear base end edge and a skin contact portion folded toward the skin surface side with a crease located at the end edge of the extension portion in the front-rear direction as a base point. And have
The width base end edge is located outside the width direction with respect to the width fulcrum portion.
In the extended state of the waistband, the length of the skin contact portion in the anterior-posterior direction is a, the length of the extension portion in the anterior-posterior direction is b, and the back of the disposable diaper from the anterior-posterior proximal edge. Let c be the distance to the edge in the anteroposterior direction.
A disposable diaper that satisfies the above a + the b> the c. The fastening tape has a locking portion that is fastened to the front waist circumference area.
The disposable diaper according to claim 1, wherein the waistband extends to the rear side of a region extending in the width direction from the locking portion in the extended state. The disposable diaper according to claim 2, wherein the waistband and the fastening tape are separated from each other in the width direction. The upright portion of the waistband has a band stretch region that stretches in the width direction.
The band expansion / contraction region is provided in each of the skin contact portion and the extension portion.
The disposable diaper according to claim 3, wherein the dimension of the band expansion / contraction region in the skin contact portion in the anteroposterior direction is larger than the dimension of the band expansion / contraction region in the extension portion in the anteroposterior direction. The leak-proof gather has a rear fulcrum portion that serves as an upright fulcrum of the contraction portion on the rear side of the contraction portion.
The disposable diaper according to any one of claims 1 to 4, wherein the rear fulcrum portion is arranged in a region overlapping with the absorption core in the thickness direction. The disposable diaper according to any one of claims 1 to 5, wherein a body elastic portion that expands and contracts in the width direction is provided between the waist band and the fastening tape in the width direction. Claims 1 to 6 wherein an embossed portion continuous in the front-rear direction is formed in the region arranged on the rearmost side of the three regions obtained by dividing the absorption core into three equal parts in the front-rear direction. Disposable diaper according to any one of the above. The disposable diaper according to any one of claims 1 to 7, wherein the elongation stress of the skin contact portion in the width direction is larger than the elongation stress of the extension portion. Claims 1 to 8 wherein the elastic body that contracts in at least one of the width direction and the front-rear direction is not arranged on the non-skin surface side of the absorption core in the region overlapping the absorption core in the thickness direction. Disposable diaper according to any one of the above.

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