JP2023021264A - disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper capable of improving absorbency by including an absorbent sheet closely fitting to a wearer's skin.

SOLUTION: A disposable diaper (10) comprises a water-absorbing sheet (70) disposed at a first waistline area, one of a front waistline area and a back waistline area, and side joint parts (60). The first waistline area includes a first area (R1) extending in a width direction, from one outer edge to the other outer edge of the first waistline area and extending in a longitudinal direction, from an inner edge of the water-absorbing sheet to the outer edge of the water-absorbing sheet. A second waistline area, the other of the front waistline area and the back waistline area, includes a second area (R2) being continuous from the first area in the width direction and extending in the width direction, from one outer edge to the other outer edge of the second waistline area. Width-directional shrinkage force of the first area is lower than width-directional shrinkage force of the second area.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2023,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a disposable diaper having an absorbent sheet.

Disposable diapers having an absorbent core and having a water absorbent sheet separate from the absorbent core are known. The water-absorbing sheet is arranged on the side facing the wearer's skin in the waist area. Therefore, the water-absorbing sheet touches the skin while being worn and absorbs sweat.

JP 2009-148531 A

The water absorbent sheet absorbs sweat by contacting the skin. Therefore, if the water-absorbing sheet is separated from the skin, the absorbability of body fluids by the water-absorbing sheet decreases, and the function of the water-absorbing sheet may not be sufficiently exhibited.

Therefore, there is a demand for a disposable diaper in which a water-absorbing sheet is brought into close contact with the wearer's skin to improve absorbency.

A disposable diaper according to one aspect includes a longitudinal direction and a width direction perpendicular to each other, a front waist region, a back waist region, a crotch region disposed between the front waist region and the back waist region, and at least the crotch region. an absorbent body arranged in a region; a water absorbent sheet arranged in a first waist region which is one of the front waist region and the rear waist region; A disposable diaper comprising an impermeable backsheet and side joints joining the outer edge of the front waist region and the outer side of the back waist region, wherein the first waist region extends in the width direction a first region extending from one outer edge to the other outer edge of the first waist region and extending from the inner edge of the water absorbent sheet to the outer edge of the water absorbent sheet in the longitudinal direction; A second waist region, which is the other of the region and the rear waist region, is continuous with the first region in the width direction and extends from one outer edge of the second waist region to the other outer edge in the width direction. It has two regions, and the contractile force in the width direction of the first region is lower than the contractive force in the width direction of the second region.

A disposable diaper according to another aspect includes a longitudinal direction and a width direction perpendicular to each other, a front waist region, a rear waist region, a crotch region disposed between the front waist region and the rear waist region, and at least the An absorbent main body arranged in a crotch region, a water absorbent sheet arranged in a first waist region which is one of the front waist region and the rear waist region, and a water absorbent sheet arranged on a non-skin facing side than the water absorbent sheet A disposable diaper comprising a liquid-impermeable back sheet and a side joint portion joining the outer portion of the front waist region and the outer portion of the rear waist region, wherein the front waist region and the rear waist region When the disposable diaper, in which the other second waist region and the first waist region are continuous in the width direction, is attached to the cylindrical body so as to be 77% of the stretched state, The ratio of the length between the side joints of the first waist region to the length between the side joints of the second waist region in the worn state is determined by the side joints of the second waist region in the stretched state. greater than the ratio of the length between the side joints of the first waist region to the length between the sections.

1 is a front view of a disposable diaper according to an embodiment; FIG. It is the top view which looked at the disposable diaper shown in FIG. 1 from the skin facing side. It is the top view which looked at the disposable diaper shown in FIG. 1 from the non-skin facing side. FIG. 3 is a cross-sectional view taken along line AA shown in FIG. 2; 3 is a cross-sectional view taken along line BB shown in FIG. 2; FIG. FIG. 2 is a cross-sectional view taken along line CC shown in FIG. 1; FIG. 2 is a cross-sectional view taken along line DD shown in FIG. 1; FIG. 2 is a cross-sectional view taken along line EE shown in FIG. 1; It is a figure which shows the state which mounted|wore the cylindrical body with the disposable diaper shown in FIG.

(1) Overview of Embodiments At least the following matters will become clear from the description of this specification and the accompanying drawings.
A disposable diaper according to one aspect includes a longitudinal direction and a width direction perpendicular to each other, a front waist region, a back waist region, a crotch region disposed between the front waist region and the back waist region, and at least the crotch region. an absorbent body arranged in a region; a water absorbent sheet arranged in a first waist region which is one of the front waist region and the rear waist region; A disposable diaper comprising an impermeable backsheet and side joints joining the outer portion of the front waist region and the outer portion of the rear waist region, wherein the first waist region extends in the width direction The front waist region and A second waist region, which is the other of the rear waist regions, is continuous with the first region in the width direction, and extends in the width direction from one outer edge of the second waist region to the other outer edge. and the contractile force in the width direction of the first region is lower than the contractive force in the width direction of the second region.

According to this aspect, when the first region and the second region contract, the first region is pulled toward the second region. Wrinkles in the first region are reduced, and the first region is easily adhered to the skin. As a result, the water-absorbent sheet adheres to the skin, and the absorbability of bodily fluids such as sweat can be improved.

According to another aspect, a longitudinal direction and a width direction perpendicular to each other, a front waist region, a back waist region, a crotch region disposed between the front waist region and the back waist region, and at least the crotch region. a water-absorbing sheet arranged in a first waist region which is one of the front waist region and the back waist region; A disposable diaper comprising a permeable backsheet and side joints joining an outer portion of the front waist region and an outer portion of the back waist region, the disposable diaper comprising: When the worn state is a state in which the disposable diaper in which a certain second waist region and the first waist region are continuous in the width direction is attached to a cylindrical body so as to be 77% of the stretched state, the worn state is The ratio of the length between the side joints of the first waist region to the length between the side joints of the second waist region in the stretched state is is greater than the ratio of the length between the side joints of the first waist region to the length of .

According to this aspect, the ratio of the length between the side joints of the first waist region to the length between the side joints of the second waist region is increased in the fitted state in which it is shrunk relative to the stretched state. Therefore, the first waist region moves toward the second waist region when contracting from the stretched state to the worn state. It has fewer wrinkles than the second waist region, and easily adheres to the skin. As a result, the water-absorbent sheet adheres to the skin, and the absorbability of bodily fluids such as sweat can be improved.

According to a preferred aspect, the first waist region is the rear waist region.

A wearer tends to perspire more on the back side than on the ventral side. By arranging the water-absorbing sheet in the rear waist area that is worn on the back of the wearer, the sweat absorption can be further improved.

According to a preferred aspect, the tape member for discarding the disposable diaper is provided, and the tape member is arranged so as to overlap at least a part of the water absorbent sheet in plan view in the thickness direction.

A region of the water absorbent sheet overlapping the tape member has a high rigidity due to the tape member. Therefore, wrinkles are less likely to occur in the water-absorbing sheet, and the water-absorbing sheet can be more easily brought into close contact with the skin.

According to a preferred aspect, in the longitudinal direction, the inner edge of the tape member is arranged inside the center of the water absorbent sheet in the longitudinal direction.

According to this aspect, the tape member is located inside the longitudinal center of the water absorbent sheet, and is easily arranged at a position corresponding to the wearer's gluteal cleft. Therefore, the water-absorbent sheet overlapping with the tape member fits the hollow of the intergluteal cleft and improves the absorbency.

According to a preferred aspect, in the longitudinal direction, the inner edge of the tape member is arranged inside the inner edge of the water absorbent sheet in the longitudinal direction.

The tape member is located inside the longitudinal inner edge of the water absorbent sheet, and is easily arranged at a position corresponding to the gluteal cleft of the wearer. Therefore, the water-absorbent sheet overlapping with the tape member fits the hollow of the intergluteal cleft and improves the absorbency.

According to a preferred aspect, the tape member overlaps the center of the rear waist region in the width direction in plan view in the thickness direction.

The tape member overlaps the center of the rear waist region in the width direction, and is likely to enter the gluteal cleft of the wearer when worn. Therefore, the water-absorbent sheet overlapping the tape member is in close contact with the tape member, and the absorbability can be further improved.

According to a preferred aspect, an outer region extending outward in the longitudinal direction from the outer edge in the longitudinal direction of the water absorbent sheet and an inner region extending inward in the longitudinal direction from the inner edge in the longitudinal direction of the water absorbent sheet. and a region in which the water absorbent sheet is arranged has a higher contractile force in the width direction than at least one of the outer region and the inner region.

Since the contractile force of the region where the water absorbent sheet is arranged is higher than the contractile force of the outer region or the contractile force of the inner region, the region where the water absorbent sheet is arranged easily fits the wearer's body without being lifted from the wearer's skin. By fitting the water-absorbing sheet to the body, it is possible to efficiently absorb body fluids and improve absorbency.

According to a preferred aspect, the widthwise shrinkage force of the region where the water absorbent sheet is arranged is higher than the widthwise shrinkage force of the outer region and the widthwise shrinkage force of the inner region.

According to this aspect, the area where the water absorbent sheet is arranged fits more easily to the body than the outer area and the inner area. Therefore, the water-absorbing sheet is less likely to lift from the skin starting from the periphery, and the adhesion of the water-absorbing sheet can be ensured.

According to a preferred aspect, the contractile force in the width direction of the first waist region is lower than the contractile force in the width direction of the second waist region.

When the first waist region and the second waist region contract, the first waist region is pulled toward the second waist region. Wrinkles in the first waist region are reduced, making it easier for the first waist region to adhere to the skin. Therefore, the water-absorbing sheet can be brought into close contact with the skin, improving absorbency.

According to a preferred aspect, in the longitudinal direction, the length between the outer edge of the first waist region and the outer edge of the front absorbent main body is equal to the outer edge of the second waist region and the front absorbent main body. longer than the outer edge of the

According to this aspect, the first waist region is less likely to be affected by compression of the absorbent main body by the legs of the wearer, and the water absorbent sheet arranged in the first waist region can be easily maintained in close contact.

(2) Embodiments of Disposable Diapers Hereinafter, disposable diapers according to embodiments will be described with reference to the drawings. In addition, in the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. However, it should be noted that the drawings are schematic, and the ratio of each dimension is different from the actual one. Therefore, specific dimensions and the like should be determined with reference to the following description. In addition, portions having different dimensional relationships and ratios may also be included between the drawings.

FIG. 1 is a front view of a disposable diaper 10 according to this embodiment. 2 is a plan view of the disposable diaper 10 viewed from the skin-facing side, and FIG. 3 is a plan view of the disposable diaper 10 viewed from the non-skin-facing side. 4 is a cross-sectional view taken along line AA shown in FIG. 2, and FIG. 5 is a cross-sectional view taken along line BB shown in FIG. The plan views shown in Figures 2 and 3 show the disposable diaper in a stretched state. In addition, 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 with the side joints 60 to be described later unfolded. In addition, the natural state in the present invention means that, in the case of a disposable diaper housed in a package, the disposable diaper is taken out of the package and left in an atmosphere of 20° C.±2° C. and a relative humidity of 60%±5% RH for 24 hours. It is in an abandoned state.

The disposable diaper 10 has a longitudinal direction L and a width direction W perpendicular to each other. The longitudinal direction L is defined by directions extending to the front side of the body and the rear side of the body. In other words, the longitudinal direction L is the direction extending forward and backward in the unfolded disposable diaper 10 . Moreover, the disposable diaper 10 has a thickness direction T orthogonal to both the longitudinal direction L and the width direction W. As shown in FIG. The thickness direction T extends to the skin facing side T1 facing the wearer and the non-skin facing side T2 facing away from the wearer.

The disposable diaper 10 has a front waist region S1, a back waist region S2, and a crotch region S3. The front waist region S1 is a region facing the wearer's front waist (abdomen). The back waist region S2 is a region facing the wearer's back waist (back). The crotch region S3 is a region located in the wearer's crotch and arranged between the front waist region S1 and the back waist region S2. In the present embodiment, a water absorbent sheet 70, which will be described later, is arranged in the rear waist region S2. Therefore, the rear waist region S2 constitutes the first waist region in the present invention, and the front waist region S1 constitutes the second waist region. In a modified example, the water absorbent sheet 70 may be arranged in the front waist region S1, the rear waist region S2 may constitute the second waist region, and the front waist region S1 may constitute the first waist region.

The disposable diaper 10 may have a front waistline member 20 , a back waistline member 30 and an absorbent body 40 . The front waist member 20 is arranged in the front waist region S1, and the region where the front waist member 20 is arranged is the front waist region. The rear waist member 30 is arranged in the rear waist region S2, and the region where the rear waist member 30 is arranged is the rear waist region. The front waistline member 20 constitutes the second waistline member in the present invention, and the rear waistline member 30 constitutes the first waistline member in the present invention. The front waistline member 20 and the rear waistline member 30 may be made of, for example, a nonwoven fabric sheet. Specifically, the front waistline member 20 and the rear waistline member 30 are arranged on the first exterior nonwoven fabric sheet 35 disposed closest to the non-skin facing surface side T2 of the disposable diaper, and on the skin facing surface side of the first exterior nonwoven fabric sheet 35. and a second exterior nonwoven sheet 36 positioned at T1. The first exterior nonwoven fabric sheet 35 and the second exterior nonwoven fabric sheet 36 constitute the nonwoven fabric sheet in the present invention. The first exterior nonwoven sheet 35 and the second exterior nonwoven sheet 36 have thermoplastic fibers. The basis weight of the first exterior nonwoven fabric sheet 35 and the basis weight of the second exterior nonwoven fabric sheet 36 in the present embodiment may be 10 g/m ² to 35 g/m ² , respectively. A spunbond nonwoven fabric, an SMS nonwoven fabric, or a pointbond nonwoven fabric can be used for the first exterior nonwoven fabric sheet 35 and the second exterior nonwoven fabric sheet 36 . The first exterior nonwoven fabric sheet 35 extends outward in the longitudinal direction L from the inner edge of the front waistline member 20 and the inner edge of the rear waistline member 30, and is folded back toward the skin facing surface side T1 with the waistline opening 62 as a base point. there is The folded portion 35F of the first exterior nonwoven fabric sheet 35 may be arranged on the skin-facing surface side T1 of the disposable diaper in the vicinity of the waist opening 62, which will be described later. The folded portion 35F of the first exterior nonwoven fabric sheet 35 covers the outer edge of the water absorbent sheet, which will be described later. A first back sheet 51 to be described later may be arranged between the first exterior nonwoven fabric sheet 35 and the second exterior nonwoven fabric sheet 36 . Here, the outer edge in the present invention is an edge located outside in the longitudinal direction L, and the inner edge is an edge located inside in the longitudinal direction.

The disposable diaper 10 may be provided with a side joint portion 60 that joins the outer portion of the front waistline member 20 and the outer portion of the rear waistline member 30 . The side joint portion 60 is defined by a portion where the outer portion of the front waistline member 20 and the outer portion of the rear waistline member 30 are engaged with each other. Here, the outer portion in the present invention is a portion occupying a certain range in the width direction including the edge in the width direction W, and the outer edge is the edge in the width direction. The side joints 60 are positioned inside in the width direction of the outer edge 20E of the front waistline member 20 (outer edge of the front waistline region S1) and the outer edge 30E of the rear waistline member 30 (outer edge of the rear waistline region S2). you can Specifically, the outer edge of the side joint portion 60 may be located inside the outer edge 20E of the front waistline member 20 and the outer edge 30E of the rear waistline member 30 by 5 mm or more. As shown in FIG. 1, with the side joints 60 formed, the disposable diaper 10 has a waist opening 62 through which the wearer's waist is passed and a pair of legs into which the wearer's legs are respectively inserted. A turning opening 66 is formed. The waist opening 62 may be defined by the front edge of the front waist region S1 and the rear edge of the rear waist region S2.

Here, FIG. 2 shows a state in which the side joints 60 are unjoined and the disposable diaper 10 is unfolded. The side joints 60 may extend along the longitudinal direction L in each of the front waistline member 20 and the rear waistline member 30 . In this case, the boundary between the front waist region S<b>1 and the crotch region S<b>3 may be defined by the rear edge of the side joint portion 60 provided in the front waist member 20 . Similarly, the boundary between the back waist region S2 and the crotch region S3 may be defined by the front edge of the side joints 60 provided on the back waist member 30 .

Stretchable members 32 that are stretchable in the width direction W may be arranged in the front waist region S1 and the rear waist region S2. The stretchable member 32 may be composed of a thread rubber stretchable in the width direction W or an elastic sheet stretchable in the width direction W, for example. Alternatively, the stretchable member 32 may be composed of the front waistline member 20 itself and the rear waistline member 30 themselves made of, for example, stretchable sheets.

The contractile force in the width direction W of the front waist region S1 that constitutes the second waist region may be higher than the contractile force in the width direction W of the back waist region S2 that constitutes the first waist region. Since the contractile force of the front waist region S1 is higher than the contractile force of the rear waist region S2, the outer edge in the width direction W of the rear waist region S2 is pulled toward the front waist region S1 when worn. Therefore, the outer edge in the width direction of the back waist region is easily visible to the wearer when viewed from the front. Further, when the front waist region S1 and the rear waist region S2 contract, the rear waist region S2 is pulled toward the front waist region S1. The wrinkles formed in the rear waist region S2 are less than those in the front waist region S1, and the rear waist region S2 easily adheres to the skin.

The shrinkage force in the present embodiment is the easiness of shrinkage in the width direction, and can be measured as follows. First, the side joints of the disposable diaper are broken to unfold the disposable diaper. The diaper is cut along the rear edge of the front waistline member and the front edge of the rear waistline member to separate the crotch region. As a result, a sample of the front waist region and a sample of the rear waist region can be obtained. In addition, when measuring the contractile force of the first region and the second region, which will be described later, the first region and the second region are cut out from the front waist region and the back waist region, and the sample of the first region and the sample of the second region are obtained. Obtainable.

Then, when 10 mm of each end in the width direction is used as a grip portion for each sample, and the portion other than each grip portion is the remaining portion, the remaining portion is expanded in the longitudinal direction and the width direction without wrinkles (100 The dimension LA (mm) in the width direction is determined in advance. Then, each gripping portion of the sample is gripped by each upper and lower chuck provided in a tensile tester (for example, Autograph AGS-X manufactured by Shimadzu Corporation), and the interval between the upper and lower chucks is widened. A state in which the contracted sample is stretched in the width direction at a pulling speed of 100 (mm / min) to a length of 85% of the above LA, and then the distance between each chuck is narrowed to a length of 70% of LA. to The contraction force (N) is the force in this narrowed state.

The disposable diaper 10 may have a tape member 80 for disposal of the disposable diaper. The tape member 80 may be arranged on the most non-skin facing side T2 of the disposable diaper 10 . The tape member 80 may be configured to be able to extend in the longitudinal direction L at the time of disposal compared to the state before disposal. Specifically, the tape member 80 may be folded with the crease along the width direction W as the base point. The bending rigidity in the longitudinal direction L of the tape member 80 may be higher than the bending rigidity in the longitudinal direction of other constituent members constituting the disposable diaper. The bending rigidity in the width direction may be higher than that of the other constituent members.

The absorbent main body 40 may be arranged at least in the crotch region S3. The absorbent body 40 may extend into the front waistline region S1 and the back waistline region S2. The absorbent main body 40 may be configured separately from the front waistline member 20 and the rear waistline member 30 . In this case, the absorbent main body 40 may be joined to the front waist member 20 and the rear waist member 30 in the front waist region S1 and the back waist region S2, respectively. As shown in FIG. 2, in the longitudinal direction L, the length L12 between the outer edge of the back waist region and the outer edge of the absorbent main body is equal to the outer edge of the front waist region S1 and the outer edge of the absorbent main body. and may be longer than the length L11.

The absorbent body 40 includes at least an absorbent core 45 . The absorbent core 45 may comprise, for example, ground pulp or superabsorbent polymers (SAP), or mixtures thereof. The absorbent core 45 is arranged at least in the crotch region S3. Preferably, the absorbent core 45 may extend in the longitudinal direction L from the front waist region S1 to the rear waist region S2. The absorbent core 45 may be covered with a core wrap. Further, the absorbent main body 40 may have a topsheet 41 located on the skin-facing side of the absorbent core 45 .

The absorbent body 40 may have leg flaps 46 . The leg flaps 46 may be arranged outside in the width direction W of the absorbent core 45 . The leg flaps 46 may have at least two layers of leg sheets 47 and leg elastic members 48 arranged between the leg sheets 47 . The leg sheet 47 may be a part of the top sheet 41, a part of a back sheet (not shown), or a separate sheet from the top sheet 41 and the back sheet. The leg elastic member 48 is fixed to the leg seat 47 while being stretched in the longitudinal direction. The leg elastic member 48 may be composed of a plurality of rubber threads (320 to 620 dtex) spaced apart in the width direction. The leg elastic member 48 is arranged in a stretched state in a predetermined longitudinal region of the leg flap 46 . A longitudinal contraction force acts on the leg flaps 46 in the regions where the leg elastic members 48 are arranged in the stretched state, and the leg flaps 46 are longitudinally contracted in the regions where the leg elastic members 48 are not arranged in the stretched state. There is no force to contract in the direction. In this specification, the longitudinal length of the region on which this longitudinal contraction force acts is also referred to as the “effective length” of the leg elastic member 48 . The effective length portion is a portion where wrinkles are formed due to contraction of the leg elastic members in the natural state of the diaper. The active length portion 49 of the leg elastic member 48 is shown in FIG. The absorbent main body 40 is joined to the front waistline member 20 and the rear waistline member 30 at the joint region R40 shown in FIG. The effective length portion 49 may overlap the junction region R40.

A water absorbent sheet 70 is arranged in one of the front waist region S1 and the rear waist region S2. The water absorbent sheet 70 is a sheet capable of absorbing bodily fluids such as sweat. The water absorbent sheet 70 may be arranged in the rear waist region S2. A wearer tends to perspire more on the back side than on the ventral side. By arranging the water absorbent sheet 70 in the rear waist region S2 that is worn on the back side of the wearer, the sweat absorption can be further improved. The water absorbent sheet 70 may have a pulp sheet 71 containing at least pulp fibers. Pulp fibers include, for example, wood pulp and non-wood pulp. Examples of wood pulp include softwood pulp and hardwood pulp, and examples of non-wood pulp include cotton pulp, hemp pulp, straw pulp, bamboo pulp, bagasse pulp, reed pulp, and kenaf pulp. The pulp sheet 71 may contain hydrophilic fibers other than pulp fibers. Hydrophilic fibers include natural fibers such as regenerated cellulose fibers (rayon, viscose rayon, etc.), semi-synthetic cellulose fibers (acetate fibers, etc.), purified cellulose fibers, and the like.

The water absorbent sheet 70 may further have a water absorbent nonwoven fabric sheet 72 . The water-absorbing nonwoven fabric sheet 72 constitutes the nonwoven fabric sheet in the present invention. The water-absorbent nonwoven fabric sheet 72 may be arranged with the pulp sheet 71 sandwiched in the thickness direction T. As shown in FIG. The water absorbent sheet 70 of the present embodiment has a pulp sheet 71 of 10 to 35 g/m ² and water absorbent nonwoven fabric sheets 72 of 10 to 25 g/m ² arranged on both sides of the pulp sheet 71 in the thickness direction. You can The pulp sheet 71 may have pulp fibers and no thermoplastic fibers. The water-absorbent nonwoven fabric sheet 72 has thermoplastic fibers. Examples of thermoplastic resin fibers include polyolefin polymers (polyethylene, polypropylene, polyester, polyethylene terephthalate, etc.), polyamide polymers, acrylic polymers, fibers using these, and fibers made by combining these. . The water absorbent sheet 70 may be colored. The coloring may be the color of the pulp sheet itself constituting the water absorbing sheet 70, or may be colored by printing or the like, or the water absorbing sheet 70 may be partially provided with a colored portion. The colored portion may show a pattern, a pattern, or a pattern such as stripes. In the absorbent sheet of this embodiment, the entire water absorbent sheet 70 is colored.

The water absorbent sheet 70 is arranged on the most skin-facing surface side T1 of the disposable diaper 10 . Therefore, the water absorbent sheet 70 touches the wearer's skin when worn. The water absorbent sheet 70 touches the skin and absorbs bodily fluids such as sweat. The water absorbent sheet 70 may overlap at least the first exterior nonwoven fabric sheet 35 and the second exterior nonwoven fabric sheet 36 in the thickness direction. The water absorbent sheet 70 is joined to a member such as a sheet positioned on the non-skin facing surface side T2 of the water absorbent sheet 70 by an adhesive means or the like.

The water absorbent sheet 70 does not have to overlap the effective length of the leg flap 46 in a plan view in the thickness direction. As in the present embodiment, a pants-type diaper having a structure in which the front waistline member and the rear waistline member are spaced apart in the longitudinal direction extends outward in the width direction W from the absorbent core 45, and the front waistline member 20 and the rear waistline member Leg flaps 46 secured to 30 allow the leg area of the disposable diaper to fit around the wearer's legs. However, when the absorbent core absorbs body fluid, the weight of the body fluid causes the absorbent main body to move downward, and contraction of the leg flaps 46 in the longitudinal direction exerts downward force on the front and rear waist members. It may take. Since the effective length portion 49 of the leg flap 46 and the water absorbent sheet 70 do not overlap in the thickness direction, the downward force transmitted through the leg flap 46 is less likely to be applied to the water absorbent sheet 70, and the water absorbent sheet is displaced downward. is easy to suppress. Therefore, it is possible to suppress the positional displacement of the water-absorbing sheet in the longitudinal direction, and to easily keep the water-absorbing sheet around the waist of the wearer. Therefore, the water-absorbing sheet 70 is arranged at an appropriate position with respect to the wearer, and the sweat-absorbing effect of the wearer can be easily maintained.

Further, among the leg elastic members of the leg flaps, the leg elastic members 482 positioned on the outer side in the width direction do not overlap the joint region R40, and the leg elastic members 481 positioned on the inner side in the width direction overlap the joint region R40. you can Since the leg elastic members 482 positioned on the outer side in the width direction do not overlap with the joint region R40, the leg flaps can be flexibly deformed when fitted around the wearer's leg, allowing the wearer to move the leg. becomes easier. Also, the leg elastic members 481 located on the inner side in the width direction are adjacent to the absorbent core that absorbs body fluids, and are likely to be weighted by the body fluids. Since the leg elastic members 481 located on the inner side in the width direction overlap with the joint region R40, even when the absorbent core becomes heavy due to absorption of body fluids, the leg elastic members pull up the absorbent main body toward the waist member. easier to continue.

The water absorbent sheet 70 may be provided in a part of the entire length in the longitudinal direction L of the rear waist region S2. The outer edge 702 of the water absorbent sheet 70 may be positioned inside in the longitudinal direction L of the outer edge 602 of the side joint portion 60 . The inner edge 701 of the water absorbent sheet 70 may be positioned inside in the longitudinal direction L of the inner edge 601 of the side joint portion 60 . The rear waist region S2 extends from one outer edge of the rear waist region S2 to the other outer edge in the width direction W, and extends from the inner edge of the water absorbent sheet 70 to the outer edge of the water absorbent sheet 70 in the longitudinal direction L. It may have one region R1. In other words, the first region R1 is a region obtained by combining the region where the water absorbent sheet 70 is arranged and the region extending in the width direction from the region where the water absorbent sheet 70 is arranged in the rear waist region S2. Also, the front waist region S1 may have a second region R2 that is continuous with the first region R1 in the width direction W and that extends in the width direction W from one outer edge of the front waist region S1 to the other outer edge. The first region R1 and the second region may be continuous in the width direction W in the pants-type state shown in FIG. Moreover, the water absorbent sheet 70 may be arranged in the entire width direction W of the rear waist region S2. The water absorbent sheet 70 may have an extending portion 75 arranged outside in the width direction W of the side joint portion 60 . The extending portion 75 is a portion between the outer edge 70</b>E of the water absorbent sheet 70 and the side joint portion 60 .

The disposable diaper 10 has a liquid-impermeable back sheet 50 arranged on the non-skin facing surface side T<b>2 with respect to the water absorbent sheet 70 . At least a part of the back sheet 50 may overlap the water absorbent sheet in plan view in the thickness direction T. As shown in FIG. Therefore, it is possible to suppress the body fluid absorbed by the water absorbent sheet from leaking to the non-skin facing side (outer side of the diaper). At least part of the back sheet 50 may be arranged on the non-skin facing surface side T2 relative to the absorbent sheet. The backsheet 50 may have a portion that is not located on the non-skin facing surface side T<b>2 relative to the water absorbent sheet 70 .

As shown in FIG. 4 , the backsheet 50 may have a first backsheet 51 and a second backsheet 52 positioned closer to the skin-facing surface side T1 than the first backsheet 51 . The first backsheet 51 may be arranged in each of the front waist region S1 and the rear waist region S2. The first backsheet 51 may be positioned between the first exterior nonwoven sheet 35 and the second exterior nonwoven sheet 36 . The inner edge 511 of the first backsheet 51 may be positioned outside in the longitudinal direction L of the inner edge of the back waist region S2 or the front waist region S1. The inner edge 511 of the first backsheet 51 in the rear waist region S2 may be positioned inside in the longitudinal direction L of the inner edge 701 of the water absorbent sheet 70 . The outer edge 512 of the first backsheet 51 may be positioned inside in the longitudinal direction L of the outer edge of the rear waist region S2 or the front waist region S1. The outer edge 512 of the first backsheet 51 in the rear waist region S2 may be positioned inward in the longitudinal direction of the outer edge 702 of the water absorbent sheet 70, and may be longer than the outer edge 522 of the second backsheet 52. It may be located outside the direction L. In this embodiment, the outer edge 512 of the first backsheet 51 constitutes the outer edge of the backsheet. In addition, in a modified example, the outer edge 522 of the second backsheet 52 may constitute the outer edge of the backsheet.

The second backsheet 52 may be arranged across the front waist region S1, the rear waist region S2, and the crotch region S3. The second backsheet 52 may be arranged on the non-skin facing surface side T2 of the absorbent core 45 and closer to the skin facing surface side T1 than the front waistline member 20 and the rear waistline member 30 . The outer edge 522 of the second backsheet 52 is located inside in the longitudinal direction L of the outer edge of the rear waist region S2 or the front waist region S1. The outer edge 522 of the second backsheet 52 in the rear waist region S2 may be positioned inside the outer edge 702 of the water absorbent sheet 70, and may be positioned inside the outer edge 512 of the first backsheet. good. The first backsheet 51 and the second backsheet 52 may be arranged at the central portion in the width direction W of the disposable diaper 10 and may not be arranged at the side portions in the width direction W of the disposable diaper 10 .

At least a portion of the backsheet 50 may overlap the water absorbent sheet 70 in plan view in the thickness direction. The water absorbent sheet 70 may overlap at least a portion of the first backsheet 51 , may overlap at least a portion of the second backsheet 52 , or may overlap the first backsheet 51 and the second backsheet 52 . may overlap both. The water-absorbent sheet 70 overlaps the backsheet 50 in a region inside the outer edge 512 of the first backsheet 51 in the longitudinal direction L. As shown in FIG. The water-absorbent sheet 70 overlaps both the first backsheet 51 and the second backsheet in a region inside the outer edge 522 of the second backsheet 52 in the longitudinal direction L. In addition, the water absorbent sheet 70 overlaps the backsheet 50 in the width direction W in a region inside the outer edge of the first backsheet 51 or in a region inside the outer edge of the second backsheet 52 . Since at least part of the water absorbent sheet 70 overlaps the back sheet 50, leakage of body fluid absorbed by the water absorbent sheet 70 can be suppressed. In addition, the user can recognize that at least a portion of the water absorbent sheet 70 overlaps the backsheet due to the difference in the color depth of the water absorbent sheet 70 when viewed from the outside of the diaper. Therefore, it is easy to feel secure against leakage of the body fluid absorbed by the water absorbent sheet 70 .

The water absorbent sheet 70 may have a longitudinally extending portion 77 extending outward in the longitudinal direction L from the outer edge of the back sheet 50 . In FIG. 3, a longitudinal extension portion 77 and a width extension portion 78, which will be described later, are hatched differently. The longitudinally extending portion 77 is a portion between the outer edge 512 of the first backsheet 51 and the outer edge 702 of the water absorbent sheet 70 . The longitudinally extending portion 77 extends further outward in the longitudinal direction L than the backsheet 50 and is easily visible from the outside of the diaper without the backsheet 50 interposed therebetween. Also, the water absorbent sheet 70 is colored and easily visible from the outside of the diaper. The user can easily recognize the presence of the water absorbent sheet 70 by visually recognizing the longitudinally extending portion 77 from the outside of the diaper. In the configuration in which the absorbent sheet has a colored portion, the user can easily recognize the existence of the absorbent sheet based on the colored portion of the absorbent sheet 70 . Therefore, the user can feel secure about the absorbability of bodily fluids such as sweat. Since the water absorbing sheet 70 is colored and has a region where the water absorbing sheet 70 and the back sheet 50 overlap and a region where the water absorbing sheet 70 and the back sheet 50 do not overlap, both the visibility of the water absorbing sheet and the leakage of body fluid can be achieved. The user is more likely to obtain both a sense of security against leakage and a sense of security against absorbency.

As shown in FIG. 3 , the length L21 in the longitudinal direction L of the overlapping region of the water absorbent sheet 70 and the back sheet 50 may be longer than the length L22 of the longitudinal extension portion 77 in the longitudinal direction. A length L21 in the longitudinal direction L of the region where the water absorbent sheet 70 and the back sheet 50 overlap is the distance in the longitudinal direction L between the outer edge 512 of the first back sheet 51 and the inner edge 701 of the water absorbent sheet 70 . The length in the longitudinal direction L of the longitudinally extending portion 77 is the distance in the longitudinal direction L between the outer edge 512 of the first backsheet 51 and the outer edge 702 of the water absorbent sheet 70 . The region where the water absorbent sheet 70 and the back sheet 50 overlap is longer than the longitudinally extending portion 77, so that the effect of suppressing the leakage of bodily fluids can be enhanced. Since the water absorbing sheet 70 is colored, it is easily conspicuous from other sheets. Therefore, even if the length of the longitudinally extending portion 77 is short, the user can easily recognize the presence of the water absorbent sheet 70 and feel secure about its absorbency. More preferably, the length of the longitudinally extending portion 77 in the longitudinal direction L may be less than 30% of the total length of the water absorbent sheet 70 in the longitudinal direction L. The water-absorbing sheet 70 overlaps the back sheet 50 in an area of 70% or more of the total length of the water-absorbing sheet 70 in the longitudinal direction L, thereby ensuring leakage of bodily fluids. Therefore, it is easier to achieve both visibility and leakproofness of the water absorbent sheet 70 .

The water absorbent sheet 70 may have a width extending portion 78 extending outward in the width direction from the outer edge of the backsheet 50 . The width extending portion 78 is a portion between the outer edge of the first back sheet 51 and the outer edge of the water absorbent sheet on the outer side of the outer edge 522 of the second back sheet 52 in the longitudinal direction. On the inner side in the longitudinal direction of the outer edge 522 of the sheet 52, between the outer edge of the first back sheet 51 and the outer edge of the second back sheet, the outer edge located on the outer side in the width direction and the outer edge of the water absorbent sheet. It is the part in between. The positional relationship in the width direction between the outer edge of the first backsheet 51 and the outer edge of the second backsheet is not limited. By providing the width extension portion 78 in this way, the user can visually recognize the water absorbent sheet 70 extending outward in the width direction W from the back sheet 50 from the outside of the diaper, and can recognize the existence of the water absorbent sheet. easy to recognize. Therefore, the user can feel secure about the absorbency.

As shown in FIG. 3, the width extending portion 78 may extend outward in the width direction from the center CL in the width direction between the outer edge of the backsheet and the outer edge of the disposable diaper. The widthwise extending portion 78 is arranged in a region of the widthwise outer side of the backsheet 50 that is half or more in the widthwise direction. It becomes easier for the user to visually recognize the water absorbent sheet extending outward in the width direction than the back sheet. More preferably, the water absorbent sheet 70 may be arranged over the entire width of the disposable diaper. Since the absorbent sheet is arranged over the entire width of the disposable diaper, it is easier for the user to visually recognize the absorbent sheet. The user can more easily recognize the presence of the water absorbent sheet, and can obtain a sense of security regarding its absorbency.

The longitudinally extending portion 77 and the widthwise extending portion 78 of the water absorbent sheet 70 form a non-overlapping region that does not overlap with the backsheet. In the stretched state, the area of the non-overlapping regions is preferably 60% or more of the total area of the water absorbent sheet. In the stretched state, the water-absorbent sheet does not overlap the backsheet in an area of 60% or more of the total area. Therefore, it is easier to ensure the visibility of the water absorbent sheet 70 .

In plan view in the thickness direction, the stretchable member 32 may overlap the longitudinally extending portion 77 and may be arranged on the non-skin facing side of the longitudinally extending portion 77 . The L value in the L*a*b* color space of the longitudinally extending portion 77 when the disposable diaper in its natural state is viewed from the non-skin facing side may be 82 or more, preferably 85 or more. good. The L value of the L*a*b* color space of the longitudinally extending portion 77 is not the L value of the water absorbent sheet 70 itself, but the L value measured from the non-skin facing side of the disposable diaper. The state in which the disposable diaper in its natural state is viewed from the non-skin-facing side is 24 hours in an atmosphere with a relative humidity of 60% ± 5% RH so that the non-skin-facing side of the rear waist region of the disposable diaper faces upward. It is a state in which the diaper is visually recognized after being left as it is. The longitudinally extending portion 77 of the water absorbent sheet 70 is visible through the first exterior nonwoven fabric sheet 35 and the second exterior nonwoven fabric sheet 36 . The user can visually recognize the elastic member 32 together with the longitudinally extending portion 77 when viewing the water absorbent sheet 70 from the outside of the diaper. At this time, if the elastic member 32 is too conspicuous, the elastic member 32 may cause discomfort. Specifically, if the stretchable member 32 is too conspicuous, the stretchable member is emphasized, and compared with a diaper in which the stretchable member is inconspicuously arranged, discomfort may occur, or the stretchability may be overemphasized and the skin may be damaged. It can leave stretch marks on the skin, feel harsh, chemical and harsh. When the L value of the L*a*b* color space of the longitudinally extending portion when viewed from the non-skin facing side of the diaper is 85 or more, it is possible to suppress the elastic member 32 from being too conspicuous. Sense of discomfort caused by the elastic member 32 can be suppressed. More preferably, the L value of the L*a*b* color space of the longitudinally extending portion 77 may be 91.6 or less, which is the L value of the elastic member 32 . The stretchable member 32 can be made less conspicuous with respect to the longitudinally extending portion 77 . The L value of the longitudinally extending portion is measured using a commercially available colorimeter for the measurement object, and is digitized based on the CIE1976 (L*a*b*) color space specified in JIS Z 8729. It can be obtained by the value obtained by

Preferably, the water absorbent sheet 70 may be blue-based. Since the water-absorbing sheet 70 has a blue base tone, the appearance is given a cool impression, and the refreshing feeling is improved. Also, the stretchable member 32 may be white-based. Since the stretchable member 32 has a white base tone, it becomes less noticeable with respect to the water absorbent sheet 70, and it is easier to suppress discomfort. The white base tone means that the L value in the (L*a*b*) color space is 90.0 or more, and the blue base tone means that the b value in the (L*a*b*) color space is 0 or less. And the a value is 20 or less.

Next, the evaluation of the sense of incompatibility of the water absorbent sheet configured in this way will be described. The disposable diapers in the natural state of Examples 1 to 5 and Comparative Examples 1 and 2 were visually inspected by 10 subjects who usually use disposable diapers, and the discomfort of the elastic member was evaluated according to the following evaluation criteria. A questionnaire was conducted. (L*a*b*) of the disposable diaper in the evaluation is the value of the longitudinal extension measured from the non-skin facing side of the disposable diaper in the natural state. The L value of the (L*a*b*) color space of the elastic member 32 in this evaluation is 91.6, the a value is −0.62, and the b value is −1.81. .
(criterion)
Good: The elastic member cannot be recognized. Alternatively, the stretchable member can be recognized, but discomfort does not occur.
Poor: The stretchable member can be recognized, and a sense of incongruity arises.
From the results of the questionnaire, out of the 30 subjects, the diapers for which the results of 80% or more of the subjects were "good" were given a comprehensive evaluation of ◎, and the diapers for which the results of 60% or more of the subjects were "good" were given a comprehensive evaluation of ○, Diapers for which less than 60% of the test subjects gave a "good" result were given an overall evaluation of x.

As shown in Table 1, the disposable diapers of Examples 1 to 5 are less likely to cause discomfort due to the stretchable member. Therefore, the L value of the longitudinally extending portion 77 is preferably 82 or more. Moreover, according to the disposable diapers of Examples 1 to 4, it was found that more than 80% of the users hardly felt discomfort. Therefore, more preferably, the L value of the longitudinally extending portion 77 may be 85 or more.

Next, the joining of the front waist region S1 and the rear waist region S2 in the vicinity of the side joints of the disposable diaper configured in this way will be described with reference to FIGS. 6 to 8. FIG. 6 shows the CC section shown in FIG. 1, FIG. 7 shows the DD section shown in FIG. 1, and FIG. 8 shows the EE section shown in FIG. 6 and 7 are cross sections of the area where the water absorbent sheet 70 is arranged, and FIG. 8 is a cross section of the area where the water absorbent sheet 70 is not arranged.

The disposable diaper 10 is provided with a non-joint portion NR where the front waist region S1, which is the second waist region, and the extending portion 75 of the water absorbent sheet 70 are not joined. The non-joint portion NR is a region where the front waist region S1 side surface of the extending portion 75 and the rear waist region S2 side surface of the front waist member 20 are not joined in the pants-type state. The non-joint portion NR may be provided in a region extending inward in the width direction W from the outer edge of the extension portion 75 and may be continuous from the outer edge of the extension portion 75 to the side joint portion 60 . The outer edge of the non-bonded portion NR is the outer edge of the extending portion 75, that is, the outer edge 70E of the water absorbent sheet . The inner edge of the non-joint portion NR may be adjacent to the side joint portion 60 or may be separated from the side joint portion 60 in the width direction W.

In a region extending inwardly in the width direction W from the outer edge of the extension 75, the extension 75 is not joined to the front waist region S1. Therefore, in the region extending inward in the width direction W from the outer edge of the extending portion 75, the extending portion 75 is separated from the front waist region S1, and is easily visible from the outside of the diaper. In particular, as shown in the CC cross section of FIG. 6, in the region where the water absorbent sheet 70 is not covered by the folded portion 35F of the first exterior nonwoven fabric sheet 35, the extending portion 75 is exposed and visible from the outside of the diaper. becomes easier. Moreover, since the water absorbent sheet 70 is colored, the user can easily recognize the water absorbent sheet 70 . A user can easily recognize the existence of the water absorbent sheet 70 by the extension portion 75 of the water absorbent sheet 70 . The user can recognize that the absorbent sheet 70 capable of absorbing bodily fluids is arranged separately from the absorbent core, and can obtain a sense of security with respect to the absorption of bodily fluids such as sweat. In addition, the user can recognize the outer edge of the disposable diaper in the width direction by using the extending portion 75 of the water absorbent sheet 70 as a mark, and can easily grasp the displacement of the disposable diaper in the width direction when wearing the disposable diaper. Therefore, the user can wear the disposable diaper at a suitable position on the body.

Further, the contractile force in the width direction W of the front waist region S1 that constitutes the second waist region may be higher than the contractile force in the width direction W of the back waist region S2 that constitutes the first waist region. Since the front waist region S1 contracts more easily in the width direction than the rear waist region S2, the outer edge of the rear waist region S2 is pulled toward the front waist region S1 when worn. Therefore, the extending portion 75 of the water absorbing sheet 70 is drawn forward and becomes more conspicuous when viewed from the front. In other words, the extending portion 75 is biased toward the front or rear side of the wearer's body, rather than the side portion, and is more conspicuous compared to the configuration arranged on the side portion. The user can more easily recognize the extending portion 75 of the water absorbent sheet 70, and can more easily obtain a sense of security regarding the absorbability of bodily fluids. In order to obtain the effect that the user can easily recognize the extending portion 75, the length of the extending portion 75 in the width direction W is preferably 5 mm or more.

When manufacturing a disposable diaper configured in this way, it can be manufactured, for example, by the following manufacturing method. First, a front continuum in which the front waistline member is continuous in the width direction and a rear continuum in which the rear waistline member is continuous in the width direction are respectively conveyed, and an absorptive material is conveyed so as to straddle the front continuum and the posterior continuum. Components such as the main body 40 are arranged. Next, the continuum and the absorbent main body are folded around the folding line extending in the width direction so that the front continuum and the rear continuum overlap each other. Then, side joints are formed and the continuum is cut along the outer edge of the front waist region and the outer edge of the back waist region. Thereby, a pants-type disposable diaper can be obtained.

When cutting the front continuum and the rear continuum, the front continuum and the rear continuum are cut by a cutting device such as a cutter while being superimposed. Therefore, the front continuum and the rear continuum are welded at the time of cutting, and the front continuum (front waist region) and the rear continuum (rear waist region) are joined to the outside of the side joint portion in the width direction. A joint 61 is formed (see FIGS. 1 and 8). At this time, it is difficult to bond the pulp sheet 71 containing pulp fibers to the exterior nonwoven fabric sheet, but it is easy to bond the exterior nonwoven fabric sheets to each other. Therefore, as shown in FIGS. 6 and 7, the second side joint 61 is not formed by cutting in the region where the water absorbent sheet 70 having the pulp sheet 71 is arranged. On the other hand, as shown in FIG. 8, second side joints 61 are formed by cutting in areas where the water absorbent sheet 70 is not arranged.

Second side joints 61 may be formed in regions outside and inside in the longitudinal direction L of the water absorbent sheet 70 . The second side joint portion 61 is a portion where the front waist region S1 and the rear waist region S2 are joined outside the side joint portion 60 in the width direction W. As shown in FIG. The second side joint portion 61 may be spaced apart in the width direction W from the side joint portion 60 . According to this configuration, the side joint portion 60 and the second side joint portion 61 are provided in the region outside the water absorbent sheet 70 in the longitudinal direction L. As shown in FIG. In the region outside the absorbent sheet in the longitudinal direction, it is difficult for a finger or the like to enter between the first waist region and the second waist region from the outside of the diaper, and the joint state of the side joints 60 is protected by the second side joints 61. can. Therefore, it is possible to prevent the joint of the side joint portion 60 from breaking unintentionally during use.

The nonwoven fabric sheet includes a first nonwoven fabric sheet arranged closer to the first waist region in the thickness direction than the pulp sheet 71 in the region where the side joints 60 are provided, and a pulp sheet in the region where the side joints 60 are provided. and a second side nonwoven fabric sheet arranged closer to the second waist region side in the thickness direction than the sheet 71 . In the region shown in FIG. 6, the first side nonwoven fabric sheet is composed of the water-absorbing nonwoven fabric sheet 72, the first exterior nonwoven fabric sheet 35 in the rear waist region S2, and the second exterior nonwoven fabric sheet 36 in the rear waist region S2. The sheet is composed of a water-absorbent nonwoven fabric sheet 72, a first exterior nonwoven fabric sheet 35 in the front waist region S1, and a second exterior nonwoven fabric sheet 36 in the front waist region S1. In the region shown in FIG. 7, the first side nonwoven fabric sheet includes a water-absorbing nonwoven fabric sheet 72, one first exterior nonwoven fabric sheet 35 in the front waist region S1, two first exterior nonwoven fabric sheets 35 in the rear waist region S2, and two first exterior nonwoven fabric sheets 35 in the rear waist region S2. It is composed of the second exterior nonwoven fabric sheet 36 in the waist region S2. In the region shown in FIG. 7, the second side nonwoven fabric sheet is composed of the water-absorbing nonwoven fabric sheet 72, the first exterior nonwoven fabric sheet 35 in the front waist region S1, and the second exterior nonwoven fabric sheet 36 in the front waist region S1. When the water absorbent sheet 70 does not have a water absorbent nonwoven fabric sheet, the first side nonwoven fabric sheet and the second side nonwoven fabric sheet are composed of at least one of the first outer nonwoven fabric sheet and the second outer nonwoven fabric sheet. you can

The basis weight of the first side non-woven fabric sheet and the basis weight of the first side non-woven fabric sheet may be higher than the basis weight of the pulp sheet 71 . The basis weight of the first side nonwoven fabric sheet is the total basis weight of the nonwoven fabric sheets constituting the first side nonwoven fabric sheet. The basis weight of the second non-woven fabric sheet is the total basis weight of the non-woven fabric sheets constituting the second non-woven fabric sheet. Since the basis weight of the first side nonwoven fabric sheet and the basis weight of the second side nonwoven fabric sheet are relatively high, the second side joints 61 are easily formed by joining the nonwoven fabric sheets together during cutting, and the second side joints 61 are also formed. It is easy to maintain the joining state of. While the pulp sheet 71 exhibits body fluid absorbency, it becomes easier to maintain the joined state between the outer edge of the front waist region S1 and the outer edge of the rear waist region.

The side joints 60 are formed from the non-skin facing side T2 of the diaper by heat welding or the like. Thermoplastic fibers such as non-woven fabric are welded by forming the side joints 60 . At this time, the pulp sheet 71 has pulp fibers and is less likely to be welded than a nonwoven fabric. Therefore, the joint strength of the portion of the side joint portion 60 that does not overlap with the pulp sheet 71 is higher than the joint strength of the portion of the side joint portion that overlaps the pulp sheet 71 . The portions of the side joints 60 that do not overlap with the pulp sheet 71 are the portion located outside the water absorbent sheet 70 in the longitudinal direction and the portion located inside the water absorbent sheet 70 in the longitudinal direction. As shown in FIG. 6 and the like, in the region where the side joints 60 are formed, the pulp sheet 71, the water-absorbent nonwoven fabric sheet 72, the first exterior nonwoven fabric sheet 35, and the second exterior nonwoven fabric sheet 36 overlap in the thickness direction T. .

The water absorbent sheet 70 is arranged in the rear waist region S2 and is joined to the rear waist region S2 with an adhesive or the like. Therefore, in the state in which the side joints 60 are formed, the water absorbent sheet 70 and other sheets are likely to be joined to each other on the rear waist region S2 side in the thickness direction T relative to the pulp sheet 71 . On the other hand, on the front waist region S1 side in the thickness direction T of the pulp sheet 71, it may be difficult to maintain the bonded state between the water absorbent sheet 70 and other sheets. In order to maintain the bonded state between the water absorbent sheet 70 and the front waist region S1, the basis weight of the pulp sheet 71 is lower than the basis weight of the second non-woven fabric sheet arranged closer to the second waist region than the pulp sheet 71. is preferred. Since the basis weight of the pulp sheet 71 is lower than that of the second non-woven fabric sheet, the second non-woven fabric sheet maintains the joined state of the side joints 60, preventing the side joints 60 from being unintentionally broken during use. You can prevent it from breaking.

As shown in FIG. 2, the distance L1 between the outer edge 702 of the water absorbent sheet 70 and the outer edge 602 of the side joint 60 is the same as the inner edge 701 of the water absorbent sheet 70 and the inner edge 601 of the side joint 60. may be shorter than the distance L2 of . When removing the disposable diaper from the wearer, the side joints 60 are generally torn inward in the longitudinal direction L from the outer edges 602 of the side joints 60 . At this time, the user feels that the strength of the side joints is relatively high in the region outside the water absorbent sheet 70 in the longitudinal direction L, and the strength of the side joints 60 is relatively high in the region where the water absorbent sheet 70 is arranged. low. Since the distance L1 between the outer edge 702 of the water absorbent sheet 70 and the outer edge 602 of the side joint 60 is shorter than the distance between the inner edge 701 of the water absorbent sheet 70 and the inner edge 601 of the side joint 60, the side When tearing the side joint from the longitudinal outer edge of the joint toward the longitudinal inner side, the easy-to-break area can be immediately reached. Therefore, the user can easily tear the side joint portion 60 .

Moreover, the disposable diaper 10 is configured such that the water-absorbing sheet 70 can easily adhere to the skin. Absorption of bodily fluids such as perspiration can be improved by the water-absorbing sheet 70 being in close contact with the skin. Next, a configuration for making the water absorbent sheet 70 easily adhere to the skin will be described in detail.

The contractile force in the width direction W of the first region R1 may be lower than the contractile force in the width direction of the second region R2. In the mounted state, the first region R1 and the second region R2 contract in the width direction W compared to the stretched state shown in FIG. 2 and the like, and the first region R1 is pulled toward the second region R2. Wrinkles formed in the first region R1 are reduced compared to the second region R2, and the bonding area between the first region R1 and the skin is increased. Therefore, the water-absorbent sheet 70 can be brought into close contact with the skin, improving the absorption of bodily fluids such as sweat.

Further, the contractile force in the width direction W of the rear waist region S2 may be lower than the contractile force in the width direction of the front waist region S1. In the worn state, the rear waist region S2 is pulled toward the front waist region S1. Wrinkles formed in the rear waist region S2 are reduced, and the rear waist region S2 is easily brought into close contact with the skin. Therefore, the water-absorbing sheet 70 can adhere to the skin and improve absorbency.

The wearing state in the present invention is such that the front waist region S1 and the rear waist region S2 are continuous in the width direction W via the side joints 60, and the cylindrical body 100 is 77% of the stretched state. is attached to the FIG. 9 is a diagram schematically showing a state in which it is attached to the cylinder 100 so as to be 77% of the stretched state. FIG. 9 shows the state of the disposable diaper and the tubular body viewed from the extension of the central axis of the tubular body 100 . The state in which it is attached to the cylindrical body 100 so as to be 77% of the stretched state is the following state. The front waist region S1 and the rear waist region S2 are stretched in the width direction W so that wrinkles in the front waist region S1 and the back waist region S2 are eliminated, and the length between the side joints 60 of the front waist region S1 (the left side joint The length L31 (see FIG. 2) between the inner edge of the waist region and the inner edge of the right side joint portion) and the length L32 between the side joint portions 60 of the rear waist region S2 are measured. The total length L31 between the side joints 60 of the front waist region S1 and the length L32 between the side joints 60 of the rear waist region S2 is the length of the disposable diaper 10 in the stretched state attached to the cylindrical body 100. do. Next, the disposable diaper 10 is attached to the tubular body 100 having an outer peripheral length that is 77% of the length in the stretched state. This state is assumed to be a state in which the cylindrical body 100 is attached so as to be 77% of the stretched state. The length of the cylindrical body 100 in the longitudinal direction L is at least equal to or longer than the length of the side joint portion 60 in the longitudinal direction. Also, the surface material of the cylinder 100 can be a silicon PET separator (Nippa Co., Ltd., PET38*1-B, C70905-13), and its coefficient of friction may be less than 1 μs. The coefficient of friction is a coefficient of static friction, and can be measured using a portable tribometer Muse (HEIDON, Nissin Kikai Co., Ltd.) by bringing a measuring element into contact with the surface of the cylindrical body. Measure at 5 to 10 points, and take the average value as the coefficient of friction.

The length L41 between the side joints 60 of the front waist region S1 (see FIG. 9) is the length between the side joints 60 of the rear waist region S2 when it is attached to the cylinder so as to be 77% of the stretched state. may be shorter than the length L42. When designing a disposable diaper, it is assumed that 77% of the waist circumference of the stretched width direction is included in the waist circumference of the wearer in the worn state. The ratio of the length L42 between the side joints 60 of the rear waist region S2 to the length L41 between the side joints 60 of the front waist region S1 in the worn state is the length L42 between the side joints 60 of the front waist region S1 in the stretched state. It is higher than the ratio of the length L32 between the side joints 60 of the rear waist region S2 to the length L31.

In the present embodiment, the length L31 between the side joints 60 of the front waist region S1 in the stretched state and the length L32 between the side joints 60 of the rear waist region S2 in the stretched state are shown in FIG. are the same as Therefore, the ratio of the length between the side joints 60 of the rear waist region S2 to the length between the side joints 60 of the front waist region S1 in the stretched state is 1.0. Further, as shown in FIG. 9, the side joints 60 are biased toward the front waist region S1 in the worn state. The length L42 between the side joints 60 of the rear waist region S2 in the worn state is longer than the length L41 between the side joints 60 of the front waist region S1 in the worn state. Therefore, the ratio of the length L42 between the side joints 60 of the rear waist region S2 to the length L41 between the side joints 60 of the front waist region S1 in the worn state is greater than 1.0. In this manner, since the side joints 60 are biased toward the front waist region S1 in the worn state, the rear waist region S2 has less wrinkles than the front waist region S1 and is more likely to adhere to the skin. Therefore, the water-absorbent sheet 70 can be brought into close contact with the skin, improving the absorption of bodily fluids such as sweat. In addition, when the water absorbent sheet 70 is attached to the cylindrical body so as to be 77% of the stretched state, the extending portion 75 of the water absorbent sheet 70 is biased toward the front waist region S1. Therefore, the extending portion 75 is easily visible from the front side of the body in the wearing state.

The shrinkage force in the width direction of the area where the water absorbent sheet 70 is arranged may be higher than the shrinkage force of the area located outside in the longitudinal direction. As shown in FIG. 4, a region extending outward in the longitudinal direction L from an outer edge 702 in the longitudinal direction L of the water absorbent sheet 70 is defined as an outer region R4. It is assumed that the inner region R3 extends inside. The contractile force in the width direction of the region where the water absorbent sheet 70 is arranged may be higher than the contractile force in the width direction W of at least one of the outer region R4 and the inner region R3. The region where the water absorbent sheet 70 is arranged is a region that overlaps with the water absorbent sheet 70 in plan view in the thickness direction. Since the contractile force of the region where the water absorbent sheet 70 is arranged is higher than the contractile force of the outer region R4 or the contractile force of the inner region R3, the region where the water absorbent sheet 70 is arranged fits the wearer's body without lifting off the wearer's skin. easy to do Preferably, the contractile force in the width direction W of the region where the water absorbent sheet 70 is arranged may be higher than the contractile force in the width direction W of the outer region R4. The region in which the water absorbent sheet 70 is arranged fits the body better than the outer region R4, the water absorbent sheet 70 is less likely to rise from the skin on the outer region R4 side, and the body fluid absorbed by the water absorbent sheet is suppressed from leaking from the waist opening 62. can. More preferably, the widthwise shrinkage force of the region where the water absorbent sheet is arranged may be higher than the widthwise shrinkage force of the outer region R4 and the widthwise shrinkage force of the inner region R3. The water absorbing sheet fits the body more easily. The water-absorbent sheet can efficiently absorb body fluids and improve absorbency.

In plan view in the thickness direction, the tape member 80 may be arranged so as to overlap at least a portion of the water absorbent sheet 70 . The water absorbent sheet 70 has increased rigidity due to the tape member in the region overlapping the tape member. Therefore, wrinkles are less likely to occur in the water absorbent sheet 70, and the water absorbent sheet 70 is more likely to adhere to the skin.

As shown in FIG. 3 , in the longitudinal direction L, the inner edge 801 of the tape member 80 may be arranged inside the center of the water absorbent sheet 70 in the longitudinal direction L. The water-absorbing sheet 70 is preferably arranged in a region that easily absorbs sweat, and is preferably arranged across the wearer's gluteal cleft and back. The tape member 80 is located inside the center of the water absorbent sheet 70 in the longitudinal direction L, and is easily arranged at a position corresponding to the gluteal cleft of the wearer. More preferably, the inner edge 801 of the tape member 80 may be arranged inside the inner edge 701 of the water absorbent sheet 70 in the longitudinal direction. The tape member 80 is more likely to be placed at a position corresponding to the wearer's gluteal cleft. Therefore, the water-absorbing sheet 70 overlapping the tape member 80 fits into the recess of the gluteal cleft and improves the absorbency.

In plan view in the thickness direction, the tape member 80 may overlap the center of the rear waist region S2 in the width direction. The tape member 80 overlaps the center of the rear waist region S2 in the width direction, and easily enters the gluteal cleft of the wearer when worn. More preferably, the tape member 80 may be arranged across the center in the width direction W of the rear waist region S2. The tape member 80 can easily enter the recess of the intergluteal cleft in a certain range extending left and right from the center of the intergluteal cleft in the width direction. The water-absorbing sheet 70 overlapping the tape member 80 is more closely attached to the skin, and the absorbability can be further improved.

At least a portion of the water absorbent sheet 70 may overlap the longitudinal outer edge of the absorbent core 45 on the side of the absorbent core 45 facing the skin when viewed from above in the thickness direction. More specifically, the water absorbent sheet 70 and the absorbent core 45 overlap in the longitudinal direction L in the region from the inner edge of the absorbent sheet to the outer edge of the absorbent core, and in the width direction W, the absorbent core 45 overlaps with the outer edge of the absorbent core 45. May overlap in inner regions. The absorbent core 45 is laminated with an absorbent material that absorbs bodily fluids, and generally the thickness of the absorbent core is thicker than the thickness of other diaper constituent members such as the back sheet. The water-absorbent sheet 70 overlaps the longitudinal outer edges of the absorbent core and is arranged closer to the wearer due to the thickness of the absorbent core. Therefore, the water-absorbent sheet can be brought into close contact with the wearer, and the absorbency can be improved. Further, the outer edge of the absorbent core is generally provided so as to overlap near the gluteal cleft of the wearer. The water absorbent sheet overlaps the outer edge of the absorbent core and is placed in the intergluteal cleft. Therefore, absorbability can be further improved.

Moreover, in a modified example, the water absorbent sheet 70 may be separated from the absorbent core 45 in the longitudinal direction L. Since the absorbent core 45 and the water absorbent sheet 70 are separated in the longitudinal direction, that is, the absorbent core 45 and the water absorbent sheet 70 do not overlap in plan view in the thickness direction, body fluid absorbed by the absorbent core 45 is absorbed by the water absorbent sheet 70 . It becomes difficult to transmit to the side. Therefore, leakage of bodily fluids from the water absorbent sheet 70 can be further suppressed.

The length L12 between the outer edge of the back waist region S2 and the outer edge of the absorbent main body 40 is longer than the length L11 between the outer edge of the front waist region S1 and the outer edge of the absorbent main body 40. good. The absorbent main body 40 is arranged in the crotch region S3 and is easily compressed in the width direction W by being sandwiched between the legs when worn. The absorbent main body 40 is arranged in the longitudinal direction L so as to deviate from the rear waist region S2 toward the front waist region S1. Therefore, the rear waist region S2 is less likely to be affected by the compression of the absorbent main body 40 . The water absorbent sheet 70 arranged in the rear waist region S2 can be easily maintained in close contact with the skin.

Although the present invention has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented with modifications and variations without departing from the spirit and scope of the invention defined by the claims. Accordingly, the descriptions herein are for the purpose of illustration and description, and are not intended to have any limiting meaning with respect to the present invention.

According to the present invention, a disposable diaper is desired in which a water-absorbent sheet is in close contact with the wearer's skin to improve absorbency.

10 disposable diaper 20 front waistline member 30 rear waistline member 35 first exterior nonwoven fabric sheet (nonwoven fabric sheet)
36 Second exterior nonwoven fabric sheet (nonwoven fabric sheet)
40 Absorbent main body 45 Absorbent core 46 Leg flap 49 Effective length 50 Back sheet 51 First back sheet 52 Second back sheet 60 Side joint 70 Water absorbing sheet 71 Pulp sheet 72 Water absorbing nonwoven fabric sheet (nonwoven fabric sheet)
75 Extended portion 80 Tape member S1 Front waist region S2 Back waist region S3 Crotch region L Longitudinal direction W Width direction T1 Skin facing surface side T2 Non-skin facing surface side

Claims (11)

a longitudinal direction and a width direction perpendicular to each other;
a front waist region, a back waist region, and a crotch region disposed between the front waist region and the back waist region;
an absorbent body disposed at least in the crotch region;
a water absorbent sheet arranged in a first waist region which is one of the front waist region and the rear waist region;
a liquid-impermeable back sheet disposed on the non-skin-facing side of the water absorbent sheet;
A disposable diaper having a side joint portion that joins the outer portion of the front waist region and the outer portion of the rear waist region,
The first waist region extends from one outer edge to the other outer edge of the first waist region in the width direction, and extends from the inner edge of the water absorbent sheet to the outer edge of the water absorbent sheet in the longitudinal direction. having a first region that extends;
A second waist region, which is the other of the front waist region and the rear waist region, is continuous with the first region in the width direction, and extends from one outer edge of the second waist region to the other outer edge in the width direction. having a second region extending to
The disposable diaper, wherein the contractile force in the width direction of the first region is lower than the contractive force in the width direction of the second region. a longitudinal direction and a width direction perpendicular to each other;
a front waist region, a back waist region, and a crotch region disposed between the front waist region and the back waist region;
an absorbent body disposed at least in the crotch region;
a water absorbent sheet arranged in a first waist region which is one of the front waist region and the rear waist region;
a liquid-impermeable back sheet disposed on the non-skin-facing side of the water absorbent sheet;
A disposable diaper having a side joint portion that joins the outer portion of the front waist region and the outer portion of the rear waist region,
The disposable diaper, in which the second waist region and the first waist region, which are the other of the front waist region and the back waist region, are continuous in the width direction is mounted on the cylindrical body so as to be 77% of the stretched state. When the state of wearing is the state of wearing,
The ratio of the length between the side joints of the first waist region to the length between the side joints of the second waist region in the worn state is determined by the side joints of the second waist region in the stretched state. A disposable diaper, wherein the ratio of the length between said side joints of said first girth region to the length between parts is higher than the ratio. 3. The disposable diaper according to claim 1 or 2, wherein the first waist region is the rear waist region. Having a tape member for discarding the disposable diaper,
4. The disposable diaper according to claim 3, wherein the tape member is arranged so as to overlap at least a part of the water absorbent sheet in plan view in the thickness direction. 5. The disposable diaper according to claim 4, wherein the inner edge of the tape member is arranged inside the longitudinal center of the water absorbent sheet in the longitudinal direction. 6. The disposable diaper according to claim 5, wherein the inner edge of the tape member is arranged inside the inner edge of the water absorbent sheet in the longitudinal direction. The disposable diaper according to any one of claims 4 to 6, wherein the tape member overlaps the center of the rear waist region in the width direction in plan view in the thickness direction. an outer region extending outward in the longitudinal direction from the outer edge of the water absorbent sheet in the longitudinal direction, and an inner region extending inward in the longitudinal direction from the inner edge of the water absorbent sheet in the longitudinal direction,
8. A region according to any one of claims 1 to 7, wherein the contractile force in the width direction of the region in which the water absorbent sheet is arranged is higher than the contractive force in the width direction of at least one of the outer region and the inner region. The disposable diaper described in . 9. The disposable diaper according to claim 8, wherein the widthwise shrinkage force of the region where the water absorbent sheet is arranged is higher than the widthwise shrinkage force of the outer region and the widthwise shrinkage force of the inner region. . The disposable diaper according to any one of claims 1 to 9, wherein the contractile force in the width direction of the first waist region is lower than the contractive force in the width direction of the second waist region. In the longitudinal direction, the length between the outer edge of the first waist region and the outer edge of the absorbent main body is the length of the outer edge of the second waist region and the outer edge of the absorbent main body. 11. A disposable diaper according to any one of claims 1 to 10, which is longer than the length.

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