JPWO2019093507A1 - Disposable diapers - Google Patents

Abstract

Provide a disposable diaper that allows the user to easily obtain both a sense of security against leakage and a sense of security regarding absorbency. The disposable diapers (10) are a water-absorbent sheet (70) arranged in at least one of the front waist area and the rear waist area, and a liquid-impermeable back sheet (50) arranged on the non-skin facing surface side of the water-absorbing sheet. ) And. The water absorption sheet is colored. In a plan view in the thickness direction, at least a part of the back sheet (50) overlaps the water absorbing sheet 70. The water absorbing sheet (70) has a longitudinal extending portion (77) extending outward in the longitudinal direction from the outer edge in the longitudinal direction of the back sheet (50).

Description

The present invention relates to disposable diapers having a water absorbing sheet.

Disposable diapers having an absorbing core and having a water absorbing sheet different from that of the absorbing core are known. The water absorption sheet is arranged on the side facing the skin that touches the wearer's skin in the waist circumference area. Therefore, the water absorbing sheet is arranged inside the disposable diaper in the pants type state. In addition, a liquid-impermeable back sheet is arranged on the non-skin facing surface side of the water absorption sheet. The back sheet is arranged so as to overlap the water absorption sheet in order to suppress leakage of the body fluid absorbed by the water absorption sheet.

JP-A-2009-148531

Since the water-absorbent sheet of Patent Document 1 is arranged inside the disposable diaper in the pants-shaped state, it may be difficult to see from the outside of the disposable diaper. It is difficult for the user to recognize the existence of the water-absorbing sheet, and sometimes the user does not have a sufficient sense of security regarding the absorption of body fluids such as sweat.

In particular, in the area where the water absorbing sheet and the back sheet overlap, the user may not be able to recognize the existence of the water absorbing sheet because the visibility of the water absorbing sheet from the outside of the diaper becomes low. In order to ensure the visibility of the water absorption sheet, it is conceivable to arrange the back sheet at a position where it does not overlap with the water absorption sheet. However, there is a possibility that the body fluid absorbed by the water absorption sheet may leak, and the user may not be sufficiently relieved about the leak.

Therefore, a disposable diaper is desired, which makes it easy for the user to obtain both a sense of security against leakage and a sense of security regarding absorbency.

The disposable diaper according to one embodiment includes an inseam area arranged between the longitudinal direction and the width direction orthogonal to each other, a front waist circumference area, a rear waist circumference area, and the front waist circumference area and the rear waist circumference area, and at least the inseam. The absorbent body arranged in the area, the water absorbing sheet arranged in at least one of the front waist area and the rear waist area, and the liquid impermeable surface arranged on the non-skin facing surface side of the water absorbing sheet. The water-absorbing sheet is colored, and in a plan view in the thickness direction, at least a part of the back sheet overlaps the water-absorbing sheet. The water-absorbent sheet has a longitudinal extending portion extending outward in the longitudinal direction from the outer edge of the back sheet in the longitudinal direction.

It is a front view of the disposable diaper which concerns on embodiment. It is a top view of the disposable diaper shown in FIG. 1 as seen from the skin facing surface side. FIG. 5 is a plan view of the disposable diaper shown in FIG. 1 as viewed from the non-skin facing surface side. It is sectional drawing along the line AA shown in FIG. It is sectional drawing along the line BB shown in FIG. It is sectional drawing along the line CC shown in FIG. It is sectional drawing which follows the DD line shown in FIG. It is sectional drawing along the line EE shown in FIG. It is a figure which shows the state which attached the disposable diaper shown in FIG. 1 to a cylinder.

(1) Outline of Embodiment At least the following matters are clarified by the description of this specification and the accompanying drawings.
The disposable diaper according to one embodiment includes an inseam area arranged between the longitudinal direction and the width direction orthogonal to each other, a front waist circumference area, a rear waist circumference area, and the front waist circumference area and the rear waist circumference area, and at least the inseam. The absorbent body arranged in the area, the water absorbing sheet arranged in at least one of the front waist area and the rear waist area, and the liquid impermeable surface arranged on the non-skin facing surface side of the water absorbing sheet. The water-absorbing sheet is colored, and in a plan view in the thickness direction, at least a part of the back sheet overlaps the water-absorbing sheet. The water-absorbent sheet has a longitudinal extending portion extending outward in the longitudinal direction from the outer edge of the back sheet in the longitudinal direction.

According to this aspect, since the water absorption sheet is colored and has a region where the water absorption sheet and the back sheet overlap and a longitudinal extension portion where the water absorption sheet and the back sheet do not overlap, both the visibility of the water absorption sheet and the leakage of body fluid are achieved. it can. The user can obtain both a sense of security for leakage and a sense of security for absorbency.

According to a preferred embodiment, the longitudinal length of the region where the water absorbing sheet and the back sheet overlap is longer than the longitudinal length of the longitudinal extension portion.

According to this aspect, the region where the water absorption sheet and the back sheet overlap is longer than the longitudinal extension portion, and the effect of suppressing the leakage of body fluid can be enhanced.

According to a preferred embodiment, the absorbent body has an absorbing core, and in a plan view in the thickness direction, at least a part of the water absorbing sheet absorbs the absorbing core on the skin-facing surface side. It overlaps the longitudinal outer edge of the core.

The water absorption sheet overlaps the outer edge of the absorption core in the longitudinal direction, and is arranged closer to the wearer side depending on the thickness of the absorption core. Therefore, the water-absorbing sheet adheres to the wearer, and the absorbability can be improved.

According to a preferred embodiment, the absorbent body has an absorbent core and the water absorbent sheet is separated from the absorbent core in the longitudinal direction.

Since the absorption core and the water absorption sheet are separated from each other in the longitudinal direction, the body fluid absorbed by the absorption core is less likely to be transmitted to the water absorption sheet. Therefore, the leakage of body fluid from the water absorption sheet can be further suppressed.

According to a preferred embodiment, the water absorbing sheet has a width extending portion extending outward in the width direction from the outer edge in the width direction of the back sheet.

According to this aspect, the user can more easily recognize the existence of the water-absorbing sheet and more easily obtain a sense of security regarding the absorbency.

According to a preferred embodiment, the width extending portion extends outward in the width direction from the center in the width direction between the outer edge of the back sheet and the outer edge of the disposable diaper.

According to this aspect, the user can more easily recognize the existence of the water-absorbing sheet and more easily obtain a sense of security regarding the absorbency.

According to a preferred embodiment, the water-absorbent sheet is arranged over the entire width direction of the disposable diaper.

According to this aspect, the user can more easily recognize the existence of the water-absorbing sheet and more easily obtain a sense of security regarding the absorbency.

According to a preferred embodiment, an outer region extending outward in the longitudinal direction from the outer edge of the water absorbing sheet in the longitudinal direction and an inner extending inward in the longitudinal direction from the inner edge of the water absorbing sheet in the longitudinal direction. The contraction force in the width direction of the region having the region and the region on which the water absorbing sheet is arranged is higher than the contraction force in the width direction of at least one of the outer region and the inner region.

Since the contraction force of the region where the water absorption sheet is arranged is higher than the contraction force of the outer region or the contraction force of the inner region, the region where the water absorption sheet is arranged does not float from the wearer's skin and easily fits the body. By fitting the water absorption sheet to the body, it is possible to efficiently absorb body fluids and improve the absorbability.

According to a preferred embodiment, the contraction force in the width direction of the region where the water absorption sheet is arranged is higher than the contraction force in the width direction of the outer region.

According to this aspect, the water absorbing sheet is less likely to be lifted from the skin on the outer region side, and the body fluid absorbed by the water absorbing sheet can be prevented from leaking from the waist circumference opening.

According to a preferred embodiment, in a plan view in the thickness direction, the elastic member overlaps the longitudinal extension portion and is arranged on the non-skin facing surface side of the longitudinal extension portion, and is in a natural state. The L value of the L * a * b * color space of the longitudinally extending portion in a state where the disposable diaper is visually recognized from the non-skin facing surface side is 82 or more.

When the L value of the L * a * b * color space of the longitudinal extension portion is 82 or more, the elastic member becomes inconspicuous and a sense of discomfort can be suppressed.

According to a preferred embodiment, in the longitudinal direction, the length of the outer edge of the first girth region and the outer edge of the front absorbent body is the outer edge of the second girth region and the front absorbent body. Longer than the length with the outer edge of.

According to this aspect, the first waistline area is less susceptible to the influence of the absorbent body being compressed by the wearer's legs, and it is easy to maintain the close contact state of the water absorbing sheet arranged in the first waistline area.

(2) Embodiment 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 parts in which the relationship and ratio of dimensions of the drawings are different from each other.

FIG. 1 is a front view of the disposable diaper 10 according to the present embodiment. FIG. 2 is a plan view of the disposable diaper 10 viewed from the skin facing surface side, and FIG. 3 is a plan view of the disposable diaper viewed from the non-skin facing surface side. FIG. 4 is a cross-sectional view taken along the line AA shown in FIG. 2, and FIG. 5 is a cross-sectional view taken along the line BB shown in FIG. The plan views shown in FIGS. 2 and 3 show a disposable diaper in a stretched 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 in a state in which the side joint portion 60 described later is unfolded. The natural state in the present invention means that, in the case of disposable diapers contained in a package, the disposable diapers are taken out from the package and placed in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH for 24 hours. It is in a state of being left unattended.

The disposable diaper 10 has a longitudinal direction L and a width direction W that are orthogonal to each other. The longitudinal direction L is defined by the direction extending to the anterior side and the posterior side of the body. In other words, the longitudinal direction L is the direction extending back and forth in the deployed disposable diaper 10. Further, the disposable diaper 10 has a thickness direction T orthogonal to both the longitudinal direction L and the width direction W. The thickness direction T extends to the skin facing surface side T1 facing the wearer side and the non-skin facing surface side T2 on the side away from the wearer.

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 an area facing the rear waist circumference (back) of the wearer. The inseam area S3 is an area located in the inseam of the wearer and arranged between the front waist area S1 and the rear waist area S2. In the present embodiment, the water absorption sheet 70, which will be described later, is arranged in the rear waist circumference region S2. Therefore, the rear girth area S2 constitutes the first girth area in the present invention, and the front girth area S1 constitutes the second girth area. In the modified example, the water absorption sheet 70 may be arranged in the front waist circumference area S1, the rear waist circumference area S2 may form the second waist circumference area, and the front waist circumference area S1 may form the first waist circumference area. 70 may be arranged in both the front waist circumference area S1 and the rear waist circumference area S2.

The disposable diaper 10 may have a front waist circumference member 20, a rear waist circumference member 30, and an absorbent main body 40. The front waist circumference member 20 is arranged in the front waist circumference region S1, and the region in which the front waist circumference member 20 is arranged is the front waist circumference region. The rear waist circumference member 30 is arranged in the rear waist circumference region S2, and the region in which the rear waist circumference member 30 is arranged is the rear waist circumference region. The front waist circumference member 20 constitutes the second waist circumference member in the present invention, and the rear waist circumference member 30 constitutes the first waist circumference member in the present invention. The front waist circumference member 20 and the rear waist circumference member 30 may be made of, for example, a non-woven fabric sheet. Specifically, the front waist circumference member 20 and the rear waist circumference member 30 are the first exterior non-woven fabric sheet 35 arranged on the most non-skin facing surface side T2 of the disposable diaper, and the skin facing surface side of the first exterior non-woven fabric sheet 35. It may have a second exterior non-woven fabric sheet 36 arranged in T1. The first exterior non-woven fabric sheet 35 and the second exterior non-woven fabric sheet 36 constitute the non-woven fabric sheet in the present invention. The first exterior nonwoven fabric sheet 35 and the second exterior nonwoven fabric sheet 36 have thermoplastic fibers. The basis weight of the basis weight and the second outer nonwoven sheet 36 of the first outer nonwoven sheet 35 in this embodiment, each may be ^{10g / m 2 ~35g / m 2} . As the first exterior non-woven fabric sheet 35 and the second exterior non-woven fabric sheet 36, spunbonded non-woven fabric, SMS non-woven fabric, and point-bonded non-woven fabric can be used. The first exterior non-woven fabric sheet 35 extends outward in the longitudinal direction L from the inner end edge of the front waist circumference member 20 and the inner end edge of the rear waist circumference member 30, and is folded back to the skin facing surface side T1 with the waist circumference opening 62 as a base point. There is. The folded-back portion 35F of the first exterior non-woven fabric sheet 35 may be arranged on the skin-facing surface side T1 of the disposable diaper in the vicinity of the waist circumference opening 62 described later. The folded portion 35F of the first exterior non-woven fabric sheet 35 covers the outer edge of the water absorbing sheet, which will be described later. Further, a first back sheet 51, which will be described later, may be arranged between the first exterior non-woven fabric sheet 35 and the second exterior non-woven 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 for joining the outer portion of the front waist circumference member 20 and the outer portion of the rear waist circumference member 30. The side joint portion 60 is defined by a portion in which the outer portion of the front waist circumference member 20 and the outer portion of the rear waist circumference member 30 are locked to each other. Here, the outer portion in the present invention is a portion that occupies a certain range in the width direction including the edge in the width direction W, and the outer edge is an edge in the width direction. The side joint 60 is located inside the outer edge 20E of the front waist member 20 (outer edge of the front waist area S1) and the outer edge 30E of the rear body member 30 (outer edge of the rear waist area S2) in the width direction. You can. Specifically, the outer edge of the side joint 60 may be located 5 mm or more inward of the outer edge 20E of the front waist member 20 and the outer edge 30E of the rear waist member 30. As shown in FIG. 1, in the state where the side joint 60 is formed, the disposable diaper 10 has a waist opening 62 through which the wearer's torso is passed and a pair of legs into which the wearer's legs are inserted. A peripheral opening 66 and the like are formed. The waist circumference opening 62 may be defined by the front end edge of the front waist circumference region S1 and the rear end edge of the rear waist circumference region S2.

Here, FIG. 2 shows a state in which the disposable diaper 10 is unfolded after the joint at the side joint portion 60 is released. The side joint portion 60 may extend along the longitudinal direction L in each of the front waist circumference member 20 and the rear waist circumference member 30. In this case, the boundary between the front waist circumference area S1 and the inseam area S3 may be defined by the rear end edge of the side joint portion 60 provided on the front waist circumference member 20. Similarly, the boundary between the rear waist circumference region S2 and the inseam region S3 may be defined by the front end edge of the side joint portion 60 provided on the rear waist circumference member 30.

An elastic member 32 that can be expanded and contracted in the width direction W may be arranged in the front waist circumference area S1 and the rear waist circumference region S2. The stretchable member 32 may be composed of, for example, a rubber thread that can be stretched in the width direction W or an elastic sheet that can be stretched in the width direction W. Instead, the stretchable member 32 may be composed of, for example, a front waist circumference member 20 itself made of a stretchable sheet and a rear waist circumference member 30 itself.

The contraction force in the width direction W of the front waist circumference region S1 constituting the second waist circumference region may be higher than the contraction force in the width direction W of the rear waist circumference region S2 constituting the first waist circumference region. Since the contraction force of the front waist circumference region S1 is higher than the contraction force of the rear waist circumference region S2, the outer edge of the rear waist circumference region S2 in the width direction W is pulled toward the front waist circumference region S1 in the mounted state. Therefore, the outer edge in the width direction of the rear waist circumference region can be easily seen by the wearer in the front view. Further, when the front girth area S1 and the rear girth area S2 contract, the rear girth area S2 is pulled toward the front girth area S1. The wrinkles formed in the rear waist circumference area S2 are less than those in the front waist circumference area S1, and the rear waist circumference area S2 easily adheres to the skin.

The contraction force in the present embodiment is the ease of contraction in the width direction and can be measured as follows. First, the side joint of the disposable diaper is broken to open the disposable diaper. The diaper is cut along the rear edge of the front waist member and the front edge of the rear waist member to separate the inseam area. As a result, a sample of the front waist circumference region and a sample of the rear waist circumference region can be obtained. Further, when measuring the contraction force of the first region and the second region described later, the first region and the second region are cut out from the front waist circumference region and the rear waist circumference region, and the sample of the first region and the sample of the second region are taken. Obtainable.

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

The disposable diaper 10 may have a tape member 80 for discarding the disposable diaper. The tape member 80 may be arranged on the most non-skin facing surface side T2 of the disposable diaper 10. At the time of disposal, the tape member 80 may be configured to be extendable in the longitudinal direction L as compared with the state before disposal. Specifically, the tape member 80 may be folded from a crease along the width direction W as a base point. The flexural rigidity of the tape member 80 in the longitudinal direction L may be higher than the flexural rigidity in the longitudinal direction than the other constituent members of the disposable diaper, and the flexural rigidity of the tape member 80 in the width direction constitutes the disposable diaper. It may be higher than the flexural rigidity in the width direction than other components.

The absorbent body 40 may be arranged at least in the inseam area S3. The absorbent main body 40 may extend to the front waist circumference area S1 and the rear waist circumference region S2. The absorbent main body 40 may be configured as a separate body from the front waist circumference member 20 and the rear waist circumference member 30. In this case, the absorbent main body 40 may be joined to the front waist circumference member 20 and the rear waist circumference member 30 in the front waist circumference region S1 and the rear waist circumference region S2, respectively. As shown in FIG. 2, in the longitudinal direction L, the length L12 between the outer edge of the rear girth region and the outer edge of the absorbent body is the outer edge of the front girth region S1 and the outer edge of the absorbent body. The length of and may be longer than L11.

The absorbent body 40 includes at least an absorbent core 45. The absorption core 45 may contain, for example, ground pulp or a highly absorbent polymer (SAP), or a mixture thereof. The absorption core 45 is arranged at least in the inseam area S3. Preferably, the absorption core 45 may extend from the front girth region S1 to the rear girth region S2 in the longitudinal direction L. The absorption core 45 may be covered by a core wrap. Further, the absorbent body 40 may have a top sheet 41 located on the skin-facing surface side of the absorbent core 45.

The absorbent body 40 may have a leg flap 46. The leg flap 46 may be arranged outside the absorption core 45 in the width direction W. The leg flap 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 sheet separate from the top sheet 41 and the back sheet. The leg elastic member 48 is fixed to the leg sheet 47 in a state of being extended in the longitudinal direction. The leg elastic member 48 may be composed of a plurality of rubber threads (320 to 620 dtex) arranged at intervals in the width direction. The leg elastic member 48 is arranged in an extended state in a predetermined region in the longitudinal direction of the leg flap 46. A force that contracts in the longitudinal direction acts on the leg flap 46 in the region where the leg elastic member 48 is arranged in the extended state, and is longitudinal with respect to the leg flap 46 in the region where the leg elastic member 48 is not arranged in the extended state. The force that contracts in the direction does not work. In the present specification, the longitudinal length of the region where the force for contracting in the longitudinal direction 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 by the contraction of the leg elastic member in the natural state of the diaper. FIG. 2 shows an effective length portion 49 of the leg elastic member 48. The absorbent main body 40 is joined to the front waist circumference member 20 and the rear waist circumference member 30 in the joint region R40 shown in FIG. The effective length portion 49 may overlap the junction region R40.

A water absorption sheet 70 is arranged on one of the front waist circumference area S1 and the rear waist circumference area S2. The water absorption sheet 70 is a sheet capable of absorbing body fluids such as sweat. The water absorption sheet 70 may be arranged in the rear waist circumference region S2. The wearer is more likely to sweat on the dorsal side than on the ventral side. By arranging the water absorbing sheet 70 in the rear waist circumference area S2 mounted on the back side of the wearer, the sweat absorption property can be further improved. The water absorption sheet 70 may have a pulp sheet 71 containing at least pulp fibers. Examples of pulp fibers include wood pulp and non-wood pulp. Examples of wood pulp include coniferous pulp and hardwood pulp, and examples of non-wood pulp include cotton pulp, hemp pulp, straw pulp, bamboo pulp, bagas pulp, Yoshi pulp, and Kenaf pulp. The pulp sheet 71 may contain hydrophilic fibers other than pulp fibers. Examples of the hydrophilic fiber include natural fiber such as regenerated cellulose fiber (rayon, viscose rayon, etc.), semi-synthetic cellulose fiber (acetate fiber, etc.), purified cellulose fiber, and the like.

The water-absorbing sheet 70 may further include a water-absorbing non-woven fabric sheet 72. The water-absorbent nonwoven fabric sheet 72 constitutes the nonwoven fabric sheet of the present invention. The water-absorbent nonwoven fabric sheet 72 may be arranged with the pulp sheet 71 sandwiched in the thickness direction T. Water sheet 70 of this embodiment, chromatic pulp sheet 71 of 10~35g / m ^2, a water-absorbing nonwoven fabric sheet 72 of 10 to 25 g / m ² disposed on both sides in the thickness direction of the pulp sheet 71, the You can do it. The pulp sheet 71 has pulp fibers and does not have to have thermoplastic fibers. The water-absorbent non-woven fabric sheet 72 has thermoplastic fibers. Examples of the thermoplastic resin fiber include polyolefin-based polymers (polyethylene, polypropylene, polyester-based, polyethylene terephthalate, etc.), polyamide-based polymers, acrylic-based polymers, fibers using these, and fibers composed by combining these. .. The water absorption 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. The entire water absorption sheet 70 may be colored, or a colored portion may be provided on a part of the water absorption sheet. The colored portion may show a pattern or a pattern, or may show a pattern such as a stripe. The absorbent sheet of the present embodiment is colored over the entire water-absorbing sheet 70.

The water absorbing sheet 70 is arranged on the most skin-facing surface side T1 of the disposable diaper 10. Therefore, the water absorbing sheet 70 touches the wearer's skin in the worn state. The water absorption sheet 70 touches the skin and absorbs body fluids such as sweat. The water absorbing 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 absorbing sheet 70 is joined to a member such as a sheet located on the non-skin facing surface side T2 of the water absorbing sheet 70 by an adhesive means such as an adhesive.

The water absorption sheet 70 does not have to overlap with the effective length portion of the leg flap 46 in a plan view in the thickness direction. As in the present embodiment, the pants-type diaper having a structure in which the front waist member and the rear waist member are separated in the longitudinal direction extends outward in the width direction W from the absorption core 45, and the front waist member 20 and the rear waist member 20 and the rear waist member. The leg flap 46 fixed to 30 fits the leg circumference area of the disposable diaper to the wearer's leg circumference. However, when the absorbing core absorbs the body fluid, the weight of the body fluid generates a force to lower the absorbent body downward, and the leg flap 46 contracts in the longitudinal direction to exert a downward force to the front waist member and the rear waist member. There is a risk of this. Since the effective length portion 49 of the leg flap 46 and the water absorbing sheet 70 do not overlap in the thickness direction, it becomes difficult for the downward force transmitted through the leg flap 46 to be applied to the water absorbing sheet 70, and the water absorbing sheet shifts downward. Is easy to deter. Therefore, it is easy to suppress the displacement of the water absorbing sheet in the longitudinal direction and keep the water absorbing sheet around the wearer's waist. Therefore, the water absorbing sheet 70 is arranged at an appropriate position with respect to the wearer, and the effect of absorbing the sweat of the wearer can be easily maintained.

Further, among the leg elastic members of the leg flap, the leg elastic member 482 located outside in the width direction does not overlap the joint region R40, and the leg elastic member 481 located inside in the width direction overlaps the joint region R40. You can. Since the leg elastic member 482 located on the outer side in the width direction does not overlap the joint region R40, the leg flap can be flexibly deformed when the leg flap fits around the wearer's leg, and the wearer moves the leg. It will be easier. Further, the leg elastic member 481 located inside in the width direction is adjacent to the absorption core that absorbs the body fluid, and is easily weighted by the body fluid. Since the leg elastic member 481 located inside in the width direction overlaps the joint region R40, even when the absorption core becomes heavy due to absorption by body fluid, the leg elastic member pulls up the absorbent body toward the waistline member. It will be easier to continue.

The water absorption sheet 70 may be provided in a part of the entire area of the rear waist circumference region S2 in the longitudinal direction L. The outer edge 702 of the water absorbing sheet 70 may be located inside the outer edge 602 of the side joint 60 in the longitudinal direction L. The inner edge 701 of the water absorbing sheet 70 may be located inside the inner edge 601 of the side joint 60 in the longitudinal direction L. The rear waist circumference region S2 extends from one outer edge of the rear waist circumference region S2 to the other outer edge in the width direction W, and extends from the inner end edge of the water absorption sheet 70 to the outer end edge of the water absorption sheet 70 in the longitudinal direction L. It may have one region R1. In other words, the first region R1 is a combination of a region in which the water absorbing sheet 70 is arranged and a region extending in the width direction from the region in the rear waist circumference region S2 in which the water absorbing sheet 70 is arranged. Further, the front waist circumference region S1 may have a second region R2 that is continuous with the first region R1 in the width direction W and extends from one outer edge of the front waist circumference region S1 to the other outer edge in the width direction W. The first region R1 and the second region may be continuous in the width direction W in the pants-shaped state shown in FIG. Further, the water absorption sheet 70 may be arranged over the entire width direction W of the rear waist circumference region S2. The water absorption sheet 70 may have an extension portion 75 arranged outside the side joint portion 60 in the width direction W. The extending portion 75 is a portion between the outer edge 70E of the water absorbing 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 T2 of the water absorbing sheet 70. At least a part of the back sheet 50 may overlap with the water absorbing sheet in a plan view in the thickness direction T. Therefore, it is possible to prevent the body fluid absorbed by the water absorption sheet from leaking to the non-skin facing surface side (outside of the diaper). It is sufficient that at least a part of the back sheet 50 is arranged on the non-skin facing surface side T2 of the water absorbing sheet. The back sheet 50 may have a portion that is not arranged on the non-skin facing surface side T2 of the water absorbing sheet 70.

As shown in FIG. 4, the back sheet 50 may have a first back sheet 51 and a second back sheet 52 located on the skin-facing surface side T1 of the first back sheet 51. The first back sheet 51 may be arranged in each of the front waist circumference area S1 and the rear waist circumference area S2. The first back sheet 51 may be located between the first exterior non-woven fabric sheet 35 and the second exterior non-woven fabric sheet 36. The inner edge 511 of the first backsheet 51 may be located outside the inner edge of the rear waist area S2 or the front waist area S1 in the longitudinal direction L. The inner edge 511 of the first back sheet 51 in the rear waist circumference region S2 may be located inside the inner edge 701 of the water absorbing sheet 70 in the longitudinal direction L. The outer edge 512 of the first backsheet 51 may be located inside the outer edge of the rear waist area S2 or the front waist area S1 in the longitudinal direction L. The outer edge 512 of the first backsheet 51 in the rear waist circumference region S2 may be located inside the outer edge 702 of the water absorbing sheet 70 in the longitudinal direction, and is longer than the outer edge 522 of the second backsheet 52. It may be located outside the direction L. In the present embodiment, the outer edge 512 of the first backsheet 51 constitutes the outer edge of the backsheet. In the modified example, the outer edge 522 of the second back sheet 52 may form the outer edge of the back sheet.

The second back seat 52 may be arranged so as to straddle the front waist circumference area S1, the rear waist circumference area S2, and the inseam area S3. The second back sheet 52 is the non-skin facing surface side T2 of the absorption core 45, and may be arranged on the skin facing surface side T1 rather than the front waist circumference member 20 and the rear waist circumference member 30. The outer edge 522 of the second back sheet 52 is located inside the outer edge of the rear waist area S2 or the front waist area S1 in the longitudinal direction L. The outer edge 522 of the second back sheet 52 in the rear waist circumference region S2 may be located inside the outer edge 702 of the water absorbing sheet 70, and may be located inside the outer edge 512 of the first back sheet. Good. The first backsheet 51 and the second backsheet 52 may be arranged at the center of the disposable diaper 10 in the width direction W, and may not be arranged at the side of the disposable diaper 10 in the width direction W.

In a plan view in the thickness direction, at least a part of the back sheet 50 may overlap the water absorbing sheet 70. The water absorbing sheet 70 may overlap with at least a part of the first backsheet 51, may overlap with at least a part of the second backsheet 52, and the first backsheet 51 and the second backsheet 52 may overlap. It may overlap with both of. The water-absorbent sheet 70 overlaps the back sheet 50 in a region inside the first back sheet 51 in the longitudinal direction L from the outer edge 512. The water absorbing sheet 70 overlaps both the first back sheet 51 and the second back sheet in the region inside the outer edge 522 of the second back sheet 52 in the longitudinal direction L. Further, the water absorbing sheet 70 overlaps the back sheet 50 in a region inside the outer edge of the first back sheet 51 or a region inside the outer edge of the second back sheet 52 in the width direction W. Since at least a part of the water absorption sheet 70 overlaps the back sheet 50, leakage of body fluid absorbed by the water absorption sheet 70 can be suppressed. Further, when visually recognized from the outside of the diaper, the user can grasp that at least a part of the water absorbing sheet 70 overlaps with the back sheet due to the difference in color depth of the water absorbing sheet 70. Therefore, it is easy to obtain a sense of security against leakage of body fluid absorbed by the water absorption sheet 70.

The water absorbing sheet 70 may have a longitudinal extending portion 77 extending outward in the longitudinal direction L from the outer edge of the back sheet 50. In FIG. 3, the longitudinal extension portion 77 and the width extension portion 78, which will be described later, are shown with different diagonal lines. The longitudinal extending portion 77 is a portion between the outer edge 512 of the first back sheet 51 and the outer edge 702 of the water absorbing sheet 70. The longitudinal extending portion 77 extends outward in the longitudinal direction L from the back sheet 50, and is easily visible from the outside of the diaper without passing through the back sheet 50. Further, the water absorption sheet 70 is colored and is easily visible from the outside of the diaper. The user can easily recognize the presence of the water absorbing sheet 70 by visually recognizing the longitudinal extending portion 77 from the outside of the diaper. When the water absorbing sheet has a colored portion, the user can easily recognize the existence of the absorbing sheet based on the colored portion of the absorbing sheet 70. Therefore, the user can obtain a sense of security regarding the absorption of body fluids such as sweat. Since the water absorption sheet 70 is colored and includes an area where the water absorption sheet 70 and the back sheet 50 overlap and an area where the water absorption sheet 70 and the back sheet 50 do not overlap, the visibility of the water absorption sheet and the leakage of body fluid can be achieved at the same time. The user can easily obtain both a sense of security for leakage and a sense of security for absorbency.

As shown in FIG. 3, the length L21 in the longitudinal direction L of the region where the water absorbing sheet 70 and the back sheet 50 overlap may be longer than the length L22 in the longitudinal direction L of the longitudinal extending portion 77. The length L21 in the longitudinal direction L of the region where the water absorbing sheet 70 and the back sheet 50 overlap is the distance L in the longitudinal direction between the outer edge 512 of the first back sheet 51 and the inner edge 701 of the water absorbing sheet 70. The length of the longitudinal extending portion 77 in the longitudinal direction L is the distance between the outer edge 512 of the first back sheet 51 and the outer edge 702 of the water absorbing sheet 70 in the longitudinal direction L. The region where the water absorption sheet 70 and the back sheet 50 overlap is longer than the longitudinal extension portion 77, and the effect of suppressing the leakage of body fluid can be enhanced. Since the water absorption sheet 70 is colored, it is easily noticeable with respect to other sheets and the like. Therefore, even when the length of the longitudinal extension portion 77 is short, the user can easily grasp the existence of the water absorption sheet 70 and can obtain a sense of security regarding the absorbency. More preferably, the length of the longitudinal extension portion 77 in the longitudinal direction L may be less than 30% of the total length of the water absorbing sheet 70 in the longitudinal direction L. The water-absorbing sheet 70 overlaps the back sheet 50 in a region of 70% or more of the total length of the water-absorbing sheet 70 in the longitudinal direction L, and leakage of body fluid can be ensured. Therefore, it is easier to achieve both visibility and leakage resistance of the water absorption sheet 70.

The water absorbing sheet 70 may have a width extending portion 78 extending outward in the width direction from the outer edge of the back sheet 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 absorbing sheet on the outer side in the longitudinal direction from the outer edge 522 of the second back sheet 52, and is the second back. Inside the outer edge of the sheet 52 in the longitudinal direction, the outer edge of the first backsheet 51 and the outer edge of the second backsheet, which are located on the outer side in the width direction, and the outer edge of the water absorbing sheet. It is the part between. The positional relationship between the outer edge of the first backsheet 51 and the outer edge of the second backsheet in the width direction is not limited. By providing the width extending portion 78 in this way, the user can visually recognize the water absorbing sheet 70 extending to the outside of the width direction W from the back sheet 50 from the outside of the diaper and recognize the existence of the water absorbing sheet. Easy to recognize. Therefore, the user can obtain a sense of security regarding absorbability.

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 back sheet and the outer edge of the disposable diaper. The width extending portion 78 is arranged in a region more than half of the region outside the width direction W of the back sheet 50 in the width direction. The user can more easily see the water-absorbing sheet extending outward in the width direction than the back sheet. More preferably, the water absorbing sheet 70 may be arranged over the entire width direction of the disposable diaper. Since the water-absorbent sheet is arranged over the entire width direction of the disposable diaper, the user can more easily see the water-absorbent sheet. The user can more easily recognize the existence of the water-absorbing sheet and can obtain a sense of security regarding the absorbency.

The longitudinal extension 77 and the width extension 78 of the water absorption sheet 70 form a non-overlapping region that does not overlap with the back sheet. In the stretched state, the area of the non-overlapping region is preferably 60% or more of the area of the entire water absorbing sheet. In the stretched state, the water-absorbent sheet does not overlap the back sheet in a region of 60% or more of the total area. Therefore, it is easier to secure the visibility of the water absorption sheet 70.

In a plan view in the thickness direction, the stretchable member 32 may overlap the longitudinal extending portion 77 and be arranged on the non-skin facing surface side of the longitudinal extending portion 77. The L value of the L * a * b * color space of the longitudinal extending portion 77 in a state where the disposable diaper in the natural state is visually recognized from the non-skin facing surface side may be 82 or more, preferably 85 or more. Good. The L value in the L * a * b * color space of the long extending portion 77 is not the L value of the water absorbing sheet 70 itself, but the L value of the disposable diaper measured from the non-skin facing surface side. The state in which the disposable diaper in the natural state is visually recognized from the non-skin facing surface side is 24 hours in an atmosphere of a relative humidity of 60% ± 5% RH so that the non-skin facing surface in the rear waist circumference area of the disposable diaper is facing up. It is in a state where the diaper is visually recognized after being left unattended. The longitudinal extension portion 77 of the water absorption sheet 70 is visually recognized via the first exterior non-woven fabric sheet 35 and the second exterior non-woven fabric sheet 36. When the water absorbing sheet 70 is visually recognized from the outside of the diaper, the user can visually recognize the elastic member 32 together with the longitudinal extending portion 77. At this time, if the stretchable member 32 is too conspicuous, the stretchable member 32 may cause a sense of discomfort. Specifically, when the stretchable member 32 is too conspicuous, the stretchable member is emphasized, causing a sense of discomfort as compared with a diaper in which the stretchable member is inconspicuously arranged, or the stretchability is emphasized too much, resulting in skin. There is a risk that the diaper will have marks due to expansion and contraction, which may make it feel unfriendly to the skin, or it may be chemical-like and unfriendly to the skin. When the L value of the L * a * b * color space of the longitudinal extension portion is 85 or more in the state of being visually recognized from the non-skin facing surface side of the diaper, it is possible to prevent the elastic member 32 from becoming too conspicuous, and it is possible to expand and contract. The discomfort caused by the sex member 32 can be suppressed. More preferably, the L value of the L * a * b * color space of the longitudinal extension portion 77 may be 91.6 or less, which is the L value of the elastic member 32. The elastic member 32 can be made less noticeable with respect to the longitudinal extending portion 77. The L value of the longitudinal extension portion is quantified based on the CIE1976 (L * a * b *) color space specified in JIS Z 8729 by measuring the color of the measurement target using a commercially available colorimeter. It can be calculated from the value obtained.

Preferably, the water absorption sheet 70 may have a blue tone. Since the water absorbing sheet 70 has a blue tone, it gives a cool appearance and improves a refreshing feeling. Further, the elastic member 32 may have a white tone. Since the elastic member 32 has a white tone, it becomes less noticeable with respect to the water absorbing sheet 70, and it is easier to suppress a sense of discomfort. The white base tone means that the L value of the (L * a * b *) color space is 90.0 or more, and the blue base tone means that the b value of the (L * a * b *) color space is 0 or less. And the a value is 20 or less.

Next, the evaluation of the discomfort of the water-absorbing sheet configured in this way will be described. The natural disposable diapers of Examples 1 to 5 and Comparative Examples 1 and 2 were visually observed by 10 subjects who normally use disposable diapers, and the discomfort of the elastic member was checked according to the following evaluation criteria. We conducted a questionnaire. The disposable diaper (L * a * b *) in the evaluation is the value of the longitudinal extension portion measured from the non-skin facing surface 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. ..
(Criteria)
Good: The elastic member cannot be recognized. Alternatively, the elastic member can be recognized, but there is no sense of discomfort.
Defective: The elastic member can be recognized, causing a sense of discomfort.
From the results of the questionnaire, diapers with a result of 80% or more of the subjects being "good" were given a comprehensive evaluation of ◎, and diapers with a result of 60% or more of the subjects being "good" were given a comprehensive evaluation of ○. The diapers whose results of less than 60% of the subjects were "good" were evaluated as x.

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

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

The disposable diaper 10 is provided with a non-joint portion NR in which the front waist circumference region S1 which is the second waist circumference region and the extension portion 75 of the water absorption sheet 70 are not joined. The non-joined portion NR is a region in which the surface of the extension portion 75 on the front waist circumference region S1 side and the surface of the front waist circumference member 20 on the rear waist circumference region S2 side are not joined. The non-joining portion NR may be provided in a region extending inward in the width direction W from the outer edge of the extending portion 75, and may be continuous from the outer edge of the extending portion 75 to the side joining portion 60. The outer edge of the non-joining portion NR is the outer edge of the extending portion 75, that is, the outer edge 70E of the water absorbing sheet 70. 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 the region extending inward in the width direction W from the outer edge of the extending portion 75, the extending portion 75 is not joined to the front waist circumference region S1. Therefore, in the region from the outer edge of the extending portion 75 toward the inside of the width direction W, the extending portion 75 is separated from the front waist circumference 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 absorbing sheet 70 is not covered by the folded-back portion 35F of the first exterior nonwoven fabric sheet 35, the extending portion 75 is exposed and is visible from the outside of the diaper. It will be easier. Further, since the water absorption sheet 70 is colored, the user can easily recognize the water absorption sheet 70. The user can easily recognize the existence of the water absorbing sheet 70 by the extending portion 75 of the water absorbing sheet 70. The user can recognize that the water absorption sheet 70 capable of absorbing body fluid is arranged separately from the absorption core, and can obtain a sense of security regarding the absorption of body fluid such as sweat. Further, the user can recognize the outer edge of the disposable diaper in the width direction by using the extending portion 75 of the water absorbing sheet 70 as a mark, and it becomes easy to grasp the deviation of the disposable diaper in the width direction at the time of wearing. Therefore, the user can wear the disposable diaper at a position suitable for the body.

Further, the contraction force in the width direction W of the front waist circumference region S1 constituting the second waist circumference region may be higher than the contraction force in the width direction W of the rear waist circumference region S2 constituting the first waist circumference region. Since the front girth area S1 is more likely to contract in the width direction than the rear girth area S2, the outer edge of the rear girth area S2 is pulled toward the front girth area S1 in the mounted state. Therefore, the extending portion 75 of the water absorbing sheet 70 is attracted to the front side and becomes more noticeable when visually recognized from the front. That is, the extending portion 75 is biased toward the front side or the rear side instead of the side portion of the wearer's body, and is more conspicuous than the configuration arranged on the side portion. The user can more easily recognize the extending portion 75 of the water absorption sheet 70, and can more easily obtain a sense of security regarding the absorption of body fluids. In order to obtain an effect that the user can easily recognize the extension portion 75, the length of the extension 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 by, for example, the following manufacturing method. First, the anterior continuous body in which the front girth member is continuous in the width direction and the rear continuous body in which the rear girth member is continuous in the width direction are conveyed, respectively, and absorbable so as to straddle the front continuous body and the rear continuous body. Components such as the main body 40 are arranged. Next, the continuum and the absorbent body are folded with the fold line extending in the width direction as a base point so that the front continuum and the rear continuum overlap. Then, a side joint is formed, and the continuous body is cut along the outer edge of the front waist circumference region and the outer edge of the rear waist circumference region. As a result, a pants-type disposable diaper can be obtained.

When cutting the front continuous body and the rear continuous body, the front continuous body and the rear continuous body are cut by a cutting device such as a cutter in a state where the front continuous body and the rear continuous body are overlapped. Therefore, the front continuous body and the rear continuous body are welded at the time of cutting, and the front continuous body (front waist circumference area) and the rear continuous body (rear waist circumference area) are joined to the outside in the width direction from the side joint portion. A joint 61 is formed (see FIGS. 1 and 8). At this time, it is difficult to join the pulp sheet 71 containing the pulp fibers and the exterior non-woven fabric sheet, and it is easy to join the exterior non-woven 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 absorbing sheet 70 having the pulp sheet 71 is arranged. On the other hand, as shown in FIG. 8, in the region where the water absorption sheet 70 is not arranged, the second side joint portion 61 is formed by cutting.

The second side joint portion 61 may be formed in the outer region and the inner region in the longitudinal direction L from the water absorption sheet 70. The second side joint portion 61 is a portion where the front waist circumference region S1 and the rear waist circumference region S2 are joined outside the side joint portion 60 in the width direction W. The second side joint 61 may be separated from the side joint 60 in the width direction W. According to this configuration, a side joint portion 60 and a second side joint portion 61 are provided in a region outside the water absorption sheet 70 in the longitudinal direction L. In the region outside the water absorption sheet in the longitudinal direction, it is difficult for fingers or the like to enter between the first waist circumference area and the second waist circumference area from the outside of the diaper, and the second side joint portion 61 protects the joint state of the side joint portion 60. it can. Therefore, it is possible to prevent the joint of the side joint portion 60 from being unintentionally torn during use.

The non-woven fabric sheet is a first-side non-woven fabric sheet arranged on the first waist circumference region side in the thickness direction of the pulp sheet 71 in the region where the side joint portion 60 is provided, and pulp in the region where the side joint portion 60 is provided. It has a second side non-woven fabric sheet arranged on the second waist circumference region side in the thickness direction with respect to the sheet 71. In the region shown in FIG. 6, the first-side non-woven fabric sheet is composed of a water-absorbent non-woven fabric sheet 72, a first exterior non-woven fabric sheet 35 in the rear waist circumference area S2, and a second exterior non-woven fabric sheet 36 in the rear waist circumference area S2. The sheet is composed of a water-absorbent non-woven fabric sheet 72, a first exterior non-woven fabric sheet 35 in the front waist circumference area S1, and a second exterior non-woven fabric sheet 36 in the front waist circumference area S1. In the region shown in FIG. 7, the first-side non-woven fabric sheet includes the water-absorbent non-woven fabric sheet 72, one first exterior non-woven fabric sheet 35 in the front waist circumference area S1, two first exterior non-woven fabric sheets 35 in the rear waist circumference area S2, and the rear. It is composed of a second exterior non-woven fabric sheet 36 in the waist circumference region S2. In the region shown in FIG. 7, the second side non-woven fabric sheet is composed of the water-absorbent non-woven fabric sheet 72, the first exterior non-woven fabric sheet 35 in the front waist circumference area S1, and the second exterior non-woven fabric sheet 36 in the front waist circumference area S1. In the configuration where the water-absorbing sheet 70 does not have the water-absorbing non-woven fabric sheet, the first-side non-woven fabric sheet and the second-side non-woven fabric sheet are composed of at least one of the first exterior non-woven fabric sheet and the second exterior non-woven 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-side nonwoven fabric sheet is the total basis weight of the nonwoven fabric sheets constituting the second-side nonwoven fabric sheet. Since the basis weight of the first side non-woven fabric sheet and the basis weight of the second side non-woven fabric sheet are relatively high, the second side joint portion 61 is easily formed by joining the non-woven fabric sheets at the time of cutting, and the second side joint portion 61 It is easy to maintain the joint state of. While exhibiting the absorption of body fluids by the pulp sheet 71, it becomes easy to maintain the bonded state of the outer edge of the front waist circumference region S1 and the outer edge of the rear waist circumference region.

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

The water absorption sheet 70 is arranged in the rear waist circumference area S2 and is joined to the rear waist circumference area S2 by an adhesive or the like. Therefore, in the state where the side joint portion 60 is formed, the joint state between the water absorbing sheet 70 and the other sheet is likely to be maintained on the rear waist circumference region S2 side in the thickness direction T as compared with the pulp sheet 71. On the other hand, on the front waist circumference region S1 side in the thickness direction T of the pulp sheet 71, it may be difficult to maintain the bonded state of the water absorbing sheet 70 and other sheets. In order to maintain the bonded state between the water absorbing sheet 70 and the front waist circumference area S1, the basis weight of the pulp sheet 71 is lower than the basis weight of the second side non-woven fabric sheet arranged on the second waist circumference area side of the pulp sheet 71. Is preferable. Since the basis weight of the pulp sheet 71 is lower than the basis weight of the second side non-woven fabric sheet, the side joint portion 60 is maintained in a bonded state by the second side non-woven fabric sheet, and the side joint portion 60 is unintentionally formed during use. It can suppress tearing.

As shown in FIG. 2, the distance L1 between the outer edge 702 of the water absorbing sheet 70 and the outer edge 602 of the side joint 60 is the inner edge 701 of the water absorbing sheet 70 and the inner edge 601 of the side joint 60. It may be shorter than the distance L2. When removing the disposable diaper from the wearer, the side joint 60 is generally broken from the outer edge 602 of the side joint 60 toward the inside of the longitudinal direction L. At this time, the user has a relatively high strength of the side joint portion in the region outside the water absorption sheet 70 in the longitudinal direction L, and the strength of the side joint portion 60 is relatively high in the region where the water absorption sheet 70 is arranged. Low. Since the distance L1 between the outer edge 702 of the water absorbing 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 absorbing sheet 70 and the inner edge 601 of the side joint 60, the side When breaking the side joint from the outer edge of the joint in the longitudinal direction toward the inside in the longitudinal direction, a region that is easily broken can be reached immediately. Therefore, the user can easily break the side joint 60.

Further, the disposable diaper 10 is configured so that the water absorbing sheet 70 easily adheres to the skin. When the water absorption sheet 70 adheres to the skin, the absorption of body fluids such as sweat can be improved. Next, the configuration for facilitating the water absorption sheet 70 in close contact with the skin will be described in detail.

The contraction force in the width direction W of the first region R1 may be lower than the contraction 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 as compared with the stretched state shown in FIG. 2, and the first region R1 is pulled toward the second region R2. The number of wrinkles formed in the first region R1 is smaller than that in the second region R2, and the adhesion area between the first region R1 and the skin is increased. Therefore, the water absorption sheet 70 adheres to the skin and can improve the absorption of body fluids such as sweat.

Further, the contraction force in the width direction W of the rear waist circumference region S2 may be lower than the contraction force in the width direction of the front waist circumference region S1. In the mounted state, the rear waist circumference area S2 is pulled toward the front waist circumference area S1. Wrinkles formed in the rear waist circumference area S2 are reduced, and the rear waist circumference area S2 easily adheres to the skin. Therefore, the water absorbing sheet 70 adheres to the skin and the absorbability can be improved.

In the wearing state of the present invention, the disposable diaper in which the front waist circumference area S1 and the rear waist circumference area S2 are continuous in the width direction W via the side joint portion 60 is 77% of the stretched state. It is assumed that it is attached to. FIG. 9 is a diagram schematically showing a state of being attached to the tubular body 100 so as to be 77% of the extended state. FIG. 9 shows a state in which the disposable diaper and the cylinder are visually recognized from the extension line of the central axis of the cylinder 100. The state of being attached to the tubular body 100 so as to be 77% of the extended state is the following state. The front girth area S1 and the rear girth area S2 are extended in the width direction W so as to eliminate wrinkles in the front girth area S1 and the rear girth area S2, and the length between the side joints 60 of the front girth area S1 (left side joint). The length L31 (see FIG. 2) between the inner edge of the portion and the inner edge of the right side joint portion and the length L32 between the side joint portions 60 in the rear waist circumference region S2 are measured. The total of the length L31 between the side joints 60 of the front waist area S1 and the length L32 between the side joints 60 of the rear waist area S2 is the total length of the disposable diaper 10 attached to the tubular body 100 in the extended state. To do. Next, the disposable diaper 10 is attached to the tubular body 100 having an outer peripheral length of 77% of the length of the stretched state. This state is assumed to be a state of being attached to the tubular body 100 so as to be 77% of the extended state. The length of the tubular body 100 in the longitudinal direction L is at least the length of the side joint 60 in the longitudinal direction. Further, as the surface material of the tubular body 100, a silicon PET separator (Nippa Corporation, PET38 * 1-B, C70905-13) can be used, and the friction coefficient thereof may be less than 1 μs. The coefficient of friction is a coefficient of static friction, and can be measured by applying a measuring element to the surface of the cylinder using a portable friction meter Muse (HEIDON, Nissin Machinery Co., Ltd.). Measure at 5 to 10 points, and use the average value as the coefficient of friction.

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

In the present embodiment, the length L31 between the side joints 60 of the front waist circumference region S1 in the extended state and the length L32 between the side joints 60 of the rear waist circumference region S2 in the extended state are shown in FIG. Is the same. Therefore, the ratio of the length between the side joints 60 in the front waist region S1 to the length between the side joints 60 in the rear waist region S2 in the extended state is 1.0. Further, as shown in FIG. 9, the side joint portion 60 is biased toward the front waist circumference region S1 side in the mounted state. The length L42 between the side joints 60 of the rear waist circumference region S2 in the mounted state is longer than the length L41 between the side joints 60 of the front waist circumference region S1 in the mounted state. Therefore, the ratio of the length L42 between the side joints 60 of the front waist area S1 to the length L41 between the side joints 60 of the rear waist area S2 in the mounted state is larger than 1.0. As described above, since the side joint portion 60 is biased toward the front waist circumference region S1 in the mounted state, the rear waist circumference region S2 has less wrinkles than the front waist circumference region S1 and easily adheres to the skin. Therefore, the water absorption sheet 70 adheres to the skin and can improve the absorption of body fluids such as sweat. Further, the extending portion 75 of the water absorbing sheet 70 is biased toward the front waist circumference region S1 side in a state of being attached to the cylinder so as to be 77% of the extended state. Therefore, the extending portion 75 is easily visible from the front side of the body in the worn state.

The contraction force in the width direction of the region where the water absorption sheet 70 is arranged may be higher than the contraction force of the region located outside in the longitudinal direction thereof. As shown in FIG. 4, the region extending outward from the outer edge 702 in the longitudinal direction L of the water absorbing sheet 70 to the outside in the longitudinal direction L is defined as the outer region R4, and the inner edge 701 of the water absorbing sheet 70 in the longitudinal direction L to the longitudinal direction L. Let it be an inner region R3 extending inward of. The contraction force in the width direction of the region where the water absorption sheet 70 is arranged may be higher than the contraction force in the width direction W of at least one of the outer region R4 and the inner region R3. The area where the water absorption sheet 70 is arranged is an area that overlaps with the water absorption sheet 70 in a plan view in the thickness direction. Since the contraction force of the region where the water absorption sheet 70 is arranged is higher than the contraction force of the outer region R4 or the contraction force of the inner region R3, the region where the water absorption sheet 70 is arranged fits the body without floating from the wearer's skin. Easy to do. Preferably, the contraction force in the width direction W of the region where the water absorbing sheet 70 is arranged may be higher than the contraction force in the width direction W of the outer region R4. The area where the water absorption sheet 70 is arranged fits the body better than the outer region R4, the water absorption sheet 70 is less likely to lift up from the skin on the outer region R4 side, and the body fluid absorbed by the water absorption sheet is prevented from leaking from the waist circumference opening 62. it can. More preferably, the contraction force in the width direction of the region where the water absorbing sheet is arranged may be higher than the contraction force in the width direction of the outer region R4 and the contraction force in the width direction of the inner region R3. The water-absorbent sheet fits your body more easily. By using the water absorption sheet, it is possible to efficiently absorb body fluids and improve the absorbability.

In a plan view in the thickness direction, the tape member 80 may be arranged so as to overlap at least a part of the water absorbing sheet 70. The water absorption sheet 70 is made more rigid by the tape member in the region where it overlaps with the tape member. Therefore, wrinkles are less likely to occur on the water absorbing sheet 70, and the water absorbing 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 absorbing sheet 70 in the longitudinal direction L. The water absorption sheet 70 is preferably arranged in a region where sweat is easily absorbed, and is preferably arranged over the back from the wearer's intergluteal cleft. The tape member 80 is located inside the center of the water absorbing sheet 70 in the longitudinal direction L, and is easily arranged at a position corresponding to the wearer's intergluteal cleft. More preferably, in the longitudinal direction, the inner edge 801 of the tape member 80 may be arranged inside the inner edge 701 of the water absorbing sheet 70. The tape member 80 is easily arranged at a position corresponding to the wearer's intergluteal cleft. Therefore, the water absorbing sheet 70 that overlaps with the tape member 80 fits into the dent of the intergluteal cleft, and the absorbability can be improved.

In a plan view in the thickness direction, the tape member 80 may overlap the center of the rear waist circumference region S2 in the width direction. The tape member 80 overlaps the center of the rear waist circumference region S2 in the width direction, and easily enters the intergluteal cleft for the wearer when worn. More preferably, the tape member 80 may be arranged so as to straddle the center of the rear waist circumference region S2 in the width direction W. The tape member 80 easily enters the intergluteal cleft in a certain range extending from the center in the width direction of the intergluteal cleft to the left and right. The water-absorbing sheet 70 that overlaps with the tape member 80 comes into close contact with the skin, and the absorbability can be further improved.

In a plan view in the thickness direction, at least a part of the water absorbing sheet 70 may overlap the outer edge of the absorbing core 45 in the longitudinal direction on the skin-facing surface side of the absorbing core 45. More specifically, the water absorbing sheet 70 and the absorbing core 45 overlap in the region from the inner edge of the water absorbing sheet to the outer edge of the absorbing core in the longitudinal direction L, and in the width direction W, than the outer edge of the absorbing core 45. May overlap in the inner area. The absorption core 45 is laminated with an absorption material that absorbs body fluids, and the thickness of the absorption core is generally thicker than that of other diaper components such as a back sheet. The water absorption sheet 70 overlaps the outer edge of the absorption core in the longitudinal direction, and is arranged closer to the wearer side depending on the thickness of the absorption core. Therefore, the water-absorbing sheet adheres to the wearer, and the absorbability can be improved. In addition, the outer edge of the absorption core is generally provided so as to overlap in the vicinity of the wearer's intergluteal cleft. The water-absorbing sheet overlaps the outer edge of the absorbing core and is placed in the intergluteal cleft. Therefore, the absorbability can be further improved.

Further, in the modified example, the water absorption sheet 70 may be separated from the absorption core 45 in the longitudinal direction L. The absorption core 45 and the water absorption sheet 70 are separated from each other in the longitudinal direction, that is, the absorption core 45 and the water absorption sheet 70 do not overlap in the plan view in the thickness direction, so that the body fluid absorbed by the absorption core 45 is the water absorption sheet. It becomes difficult to convey to the 70 side. Therefore, the leakage of body fluid from the water absorption sheet 70 can be further suppressed.

The length L12 between the outer edge of the rear waist area S2 and the outer edge of the absorbent body 40 is longer than the length L11 between the outer edge of the front waist area S1 and the outer edge of the absorbent body 40. Good. The absorbent main body 40 is arranged in the inseam area S3, is sandwiched by the legs when worn, and is easily compressed in the width direction W. The absorbent main body 40 is arranged so as to be biased toward the front waist circumference area S1 from the rear waist circumference region S2 in the longitudinal direction L. Therefore, the rear waist circumference region S2 is not easily affected by the compression of the absorbent main body 40. The water absorption sheet 70 arranged in the rear waist circumference area S2 can easily maintain a state of being in close contact with the skin.

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 gist and scope of the present invention determined by the description of the claims. Therefore, the description of the present specification is for the purpose of exemplification and does not have any limiting meaning to the present invention.

The entire contents of Japanese Patent Application No. 2017-217788 filed on November 10, 2017 are incorporated herein by reference.

According to the present invention, it is possible to provide a disposable diaper that allows the user to easily obtain both a sense of security against leakage and a sense of security regarding absorbency.

10 Disposable diaper 20 Front waistline member 30 Rear waistline member 35 First exterior non-woven fabric sheet (nonwoven fabric sheet)
36 Second exterior non-woven fabric sheet (nonwoven fabric sheet)
40 Absorbent 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 absorption sheet 71 Pulp sheet 72 Water absorption non-woven fabric sheet (nonwoven fabric sheet)
75 Extension 80 Tape member S1 Front waist circumference area S2 Rear waist circumference area S3 Inseam area L Longitudinal direction W Width direction T1 Skin facing surface side T2 Non-skin facing surface side

Claims (10)

In the longitudinal and width directions that are orthogonal to each other,
The inseam area arranged between the front waist area, the rear waist area, and the front waist area and the rear waist area,
At least the absorbent body located in the inseam area,
A water absorbing sheet arranged in at least one of the front waist circumference area and the rear waist circumference area,
A disposable diaper having a liquid-impermeable back sheet arranged on the non-skin facing surface side of the water-absorbing sheet.
The water absorption sheet is colored and
In a plan view in the thickness direction, at least a part of the back sheet overlaps the water absorbing sheet.
The water-absorbing sheet is a disposable diaper having a longitudinal extending portion extending outward in the longitudinal direction from the outer edge of the back sheet in the longitudinal direction. The disposable diaper according to claim 1, wherein the length of the region where the water absorbing sheet and the back sheet overlap is longer than the length of the longitudinal extending portion in the longitudinal direction. The absorbent body has an absorbent core
Claim 1 or claim that at least a part of the water absorbing sheet overlaps the outer edge of the absorbing core in the longitudinal direction on the skin-facing surface side of the absorbing core in a plan view in the thickness direction. Item 2. The disposable diaper according to item 2. The absorbent body has an absorbent core
The disposable diaper according to claim 1 or 2, wherein the water absorbing sheet is separated from the absorbing core in the longitudinal direction. The disposable diaper according to any one of claims 1 to 4, wherein the water-absorbing sheet has a width extending portion extending outward in the width direction from the outer edge in the width direction of the back sheet. .. The disposable diaper according to claim 5, wherein the width extending portion extends outward in the width direction from the center of the outer edge of the back sheet and the outer edge of the disposable diaper in the width direction. The disposable diaper according to any one of claims 1 to 6, wherein the water-absorbing sheet is arranged over the entire area of the disposable diaper in the width direction. An outer region extending outward in the longitudinal direction from the outer edge of the water absorbing sheet in the longitudinal direction,
It has an inner region extending inward in the longitudinal direction from the inner edge of the water absorption sheet in the longitudinal direction.
Any one of claims 1 to 7, wherein the contraction force in the width direction of the region where the water absorption sheet is arranged is higher than the contraction force in the width direction of at least one of the outer region and the inner region. Disposable diapers listed in. The disposable diaper according to claim 8, wherein the contraction force in the width direction of the region where the water absorbing sheet is arranged is higher than the contraction force in the width direction of the outer region. In a plan view in the thickness direction, it has an elastic member that overlaps the longitudinal extension portion and is arranged on the non-skin facing surface side of the longitudinal extension portion.
Any of claims 1 to 9, wherein the L value of the L * a * b * color space of the longitudinal extension portion when the disposable diaper in the natural state is visually recognized from the non-skin facing surface side is 82 or more. Disposable diapers listed in CIE.

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