JP7509637B2 - Disposable diapers - Google Patents

Description

The present invention relates to a disposable diaper, and in particular to a disposable diaper that has slits in the absorbent body to prevent bodily waste from leaking out.

A technology is known that provides slits on the side of the absorbent body to increase the contact area between the absorbent body and excrement, preventing excrement from leaking out. (Patent Document 1)

JP 2017-108883 A

However, in the technology of Patent Document 1, the vertical slits on the body side of the absorbent body that extend in the front-to-rear direction extend toward the back side beyond the horizontal slits that extend in the width direction, so there is a risk that excrement trapped in the vertical slits will leak out from the back end of the absorbent body.

Therefore, the objective of the present invention is to provide a disposable diaper that can prevent leakage of excrement from the back end of the absorbent body.

The means for solving the above problems are as follows.
The first means comprises an inner body formed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent element between the top sheet and the back sheet, and an outer body formed of a rectangular dorsal exterior body and a rectangular ventral exterior body on the opposite side of the inner body to the body surface, the absorbent element being formed of an absorbent body that absorbs excrement and a wrapping sheet that covers the absorbent body, a horizontal slit extending in the width direction and a vertical slit extending in the front-rear direction are provided in the dorsal part on the body side of the absorbent body, the vertical slits extending in the ventral direction from both side ends of the horizontal slits , and the dorsal exterior body is formed of an inner sheet made of a nonwoven fabric, and a nonwoven fabric and an elastic member extending in the width direction between the inner sheet and the outer sheet at a predetermined interval in the front-to-rear direction, wherein in a plan view, the elastic member is formed of a first elastic member extending in the width direction and provided on a rear side portion of the rear exterior body relative to the rear end of the absorbent body, and a second elastic member with a separated widthwise middle provided on a ventral side portion of the rear exterior body relative to the rear end of the absorbent body, and wherein in a plan view, a first distance between a widthwise side end of the absorbent element and a vertical slit is formed shorter than a second distance between a widthwise side end of the absorbent element and a widthwise inner end of the second elastic member .

The second means is characterized in that, in the first means, water-repellent three-dimensional gathers are provided on both sides of the width of the absorbent element to prevent excrement discharged onto the top sheet from leaking out in the width direction, the three-dimensional gathers are fixed to the body side of the absorbent element via the top sheet by a dorsal fixing part and a ventral fixing part, and in a plan view, a third distance between the dorsal end of the absorbent element and the horizontal slit is formed longer than a fourth distance between the dorsal end of the absorbent element and the ventral end of the dorsal fixing part and shorter than a fifth distance between the dorsal end of the absorbent element and the ventral end of the dorsal outer body.

The third means is characterized in that, in the second means, a fifth distance between the rear end of the absorbent element and the ventral end of the rear outer body, when viewed in a plane, is formed to be shorter than a sixth distance between the rear end of the absorbent element and the ventral end of the vertical slit.

According to the first means, an inner body is provided which is formed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent element between the top sheet and the back sheet, and an outer body is provided on the opposite side of the inner body which is formed of a rectangular back outer body and a rectangular ventral outer body, the absorbent element is formed of an absorbent body which absorbs excrement and a wrapping sheet which covers the absorbent body, a horizontal slit extending in the width direction and a vertical slit extending in the front-rear direction are provided on the back part of the body side of the absorbent body, and the vertical slit extends in the ventral direction from both ends of the horizontal slit, so that the contact area with the excrement at the back part of the absorbent body is increased, the permeation speed of the excrement is increased, and excrement leaking out from the back part of the absorbent element to the outside can be suppressed. In addition, the diffusion of excrement flowing into the horizontal slit in the width direction can be suppressed, and the diffusion of excrement flowing into the vertical slit in the front-rear direction, especially in the ventral direction, can be suppressed, and excrement leakage to the outside can be suppressed.

In addition, the rear exterior body is formed of an inner sheet made of nonwoven fabric, an outer sheet made of nonwoven fabric, and elastic members extending in the width direction between the inner sheet and the outer sheet at a predetermined interval in the front-to-rear direction, and in a plan view, the elastic members are formed of a first elastic member extending in the width direction and provided on a rear side portion of the rear exterior body closer to the rear end of the absorbent body, and a second elastic member with a separated widthwise middle provided on a ventral side portion of the rear exterior body closer to the rear end of the absorbent body, and in a plan view, a first distance between the widthwise side end of the absorbent element and the vertical slit is formed shorter than a second distance between the widthwise side end of the absorbent element and the widthwise inner end of the second elastic member. Therefore, when worn, the contractile force of the second elastic member causes a portion of the absorbent body located widthwise outside the vertical slit to fold inward and rise towards the body, thereby acting as an obstacle to excrement diffusing in the width direction and further suppressing leakage of the excrement to the outside.

According to the second means, in addition to the effect of the first means, water-repellent three-dimensional gathers are provided on both sides of the width of the absorbent element to prevent leakage of excrement discharged onto the top sheet in the width direction, and the three-dimensional gathers are fixed to the body side of the absorbent element via the top sheet by the dorsal fixing part and the ventral fixing part, and in a plan view, a third distance between the dorsal end of the absorbent element and the lateral slit is formed longer than a fourth distance between the dorsal end of the absorbent element and the ventral end of the dorsal fixing part, and shorter than a fifth distance between the dorsal end of the absorbent element and the ventral end of the dorsal outer body. Therefore, when worn, the contraction force of the first and second elastic members causes the part of the absorbent body located outside the lateral slits in the front-to-rear direction to bend inward and swell towards the body, thereby acting as an obstacle to excrement diffusing in the front-to-rear direction and further preventing leakage of excrement to the outside.

According to the third means, in addition to the effect of the second means, in a plan view, the fifth distance between the rear end of the absorbent element and the ventral end of the rear outer body is made shorter than the sixth distance between the rear end of the absorbent element and the ventral end of the vertical slit. This makes it possible to diffuse excrement temporarily retained in the horizontal slits or vertical slits toward the middle part in the front-to-rear direction of the absorbent body, thereby further suppressing leakage of excrement to the outside.

FIG. 2 is a plan view of the body side of the disposable diaper. FIG. 2 is a plan view of the side of the disposable diaper opposite to the body. 2 is a cross-sectional view taken along line AA of FIG. 1. This is a cross-sectional view taken along line B-B of FIG. FIG. 2 is a plan view showing a cross section of a portion of the rear exterior body facing the body. FIG. 13 is an explanatory diagram of wrinkles on the rear exterior body. FIG. 2 is a plan view showing a cross section of a portion of the body side of the ventral exterior body. FIG. 13 is an explanatory diagram of wrinkles on the ventral exterior body. FIG. 4 is an explanatory diagram of a horizontal slit and a vertical slit provided in the absorbent body.

As shown in Figures 1 to 4, a disposable diaper is formed of an inner body 1 and an outer body 2 provided on the side of the inner body 1 opposite the body's body. The outer body 2 is formed of a dorsal outer body 3 that faces the dorsal side of the wearer's waist when worn, and a ventral outer body 4 that faces the ventral side. In addition, both widthwise sides of the dorsal outer body 3 and both widthwise sides 4A of the ventral outer body 4 are connected to form a circumference.

The inner body 1 is formed of a liquid-permeable top sheet 10 provided on the body side, a liquid-impermeable back sheet 11 provided on the opposite side to the body, and an absorbent element 20 provided between the top sheet 10 and the back sheet 11.

It is preferable to provide an intermediate sheet made of nonwoven fabric or the like between the top sheet 10 and the absorbent element 20, which transfers the excrement that has passed through the top sheet 10 to the absorbent element 20 and prevents the excrement from flowing back.

The absorbent element 20 is formed of an absorbent body 21 and a packaging sheet 22 that covers the absorbent body 21. A horizontal slit 25 extending in the width direction and a vertical slit 26 extending in the front-rear direction are provided on the back side of the absorbent body 21 on the side facing the body. This increases the contact area between the back side of the absorbent body 21 and excrement such as urine, increases the permeation rate of the excrement, and suppresses excrement leaking out from the back side of the absorbent element 20.

The vertical slits 26 extend from both ends of the horizontal slits 25 toward the ventral side. This prevents waste that has flowed into the horizontal slits 25 from spreading in the width direction, and prevents waste that has flowed into the vertical slits 26 from spreading in the front-to-rear direction, especially toward the ventral side, thereby further preventing waste from leaking out.

On both sides of the width of the absorbent element 20, there are three-dimensional gathers 30 that prevent excrement from leaking to the outside. The three-dimensional gathers 30 are made up of a gathered sheet 31 formed by folding a rectangular sheet in half, which is formed to have a length approximately equal to the length of the absorbent element 20 in the front-to-rear direction, a waterproof sheet 32 provided between the gathered sheets 31, and an elongated elastic member 33 fixed in a stretched state along the front-to-rear direction between the gathered sheets 31.

The back side of the three-dimensional gathers 30 on the side opposite the body is fixed to the body side of the packaging sheet 22 of the absorbent element 20 via the top sheet 10, and the back side fixing part 35 is formed in a rectangular shape with its longitudinal direction in the front-to-rear direction. Similarly, the ventral side of the three-dimensional gathers 30 on the side opposite the body is fixed to the body side of the packaging sheet 22 of the absorbent element 20 via the top sheet 10, and the ventral side fixing part 36 is formed in a rectangular shape with its longitudinal direction in the front-to-rear direction.

The three-dimensional gathers 30 extend vertically along the sides of the absorbent element 20, and after wrapping around the side opposite the body of the absorbent element 20, the base of the three-dimensional gathers 30 is fixed to the widthwise side of the backsheet 11 on the side opposite the body.

As shown in FIG. 5, the rear exterior body 3 is formed from a rectangular inner sheet 40, a rectangular outer sheet 41, and an elongated elastic member 42 that is fixed in a stretched state along the width direction between the inner sheet 40 and the outer sheet 41 at a predetermined interval in the vertical direction.

The elastic member 42 is formed from an elastic member 42A (the "first elastic member" in the claims) provided on the rear side of the rear end of the absorbent element 20 on the inner sheet 40 and the outer sheet 41, and an elastic member 42B (the "second elastic member" in the claims) provided on the ventral side of the rear end of the absorbent element 20 on the inner sheet 40 and the outer sheet 41.

The elastic member 42B extends to both widthwise sides of the inner sheet 40 and the outer sheet 41 where the absorbent element 20, particularly the absorber 21, overlaps, but does not extend to the middle part excluding both widthwise sides. This prevents the back end of the absorbent element 20 from being pressed excessively against the back of the wearer's waist, and prevents marks from being left on the wearer's skin.

Fixed parts 43 are formed on the outer periphery of the elastic member 42 at a predetermined interval in the width direction, with adhesive applied. The elastic member 42 is fixed to the inner sheet 40 and the outer sheet 41 via the fixed parts 43. As a result, as shown in FIG. 6, when worn, the elastic member 42 contracts to form roughly mountain-shaped wrinkles 44 on the body side and anti-body side of the back exterior body 3, improving the fit to the back side of the wearer's waist.

As shown in FIG. 7, the ventral exterior body 4 is formed from a rectangular inner sheet 45, a rectangular outer sheet 46, and an elongated elastic member 47 that is fixed in a stretched state along the width direction between the inner sheet 45 and the outer sheet 46 at a predetermined interval in the vertical direction.

The elastic member 47 is formed from an elastic member 47A provided on the inner sheet 45 and the outer sheet 46 on the ventral side of the ventral end of the absorbent element 20, and an elastic member 47B provided on the inner sheet 45 and the outer sheet 46 on the dorsal side of the ventral end of the absorbent element 20.

The elastic member 47B extends to both widthwise sides of the inner sheet 45 and the outer sheet 46 where the absorbent element 20, particularly the absorbent body 21, overlaps, but does not extend to the middle part excluding both widthwise sides. This prevents the back end of the absorbent element 20 from being pressed excessively against the back of the wearer's waist, and prevents marks from being left on the wearer's skin.

Fixed parts 48 are formed on the outer periphery of the elastic member 47 at a predetermined interval in the width direction, with adhesive applied. The elastic member 47 is fixed to the inner sheet 45 and the outer sheet 46 via the fixed parts 48. As a result, as shown in FIG. 8, when worn, the elastic member 47 contracts, forming roughly mountain-shaped wrinkles 49 on the body side and anti-body side of the ventral exterior body 4, improving the fit to the ventral side of the wearer's waist.

As shown in FIG. 9, the first distance D1 between the widthwise side end of the absorbent element 20 and the vertical slit 26 is shorter than the second distance D2 between the widthwise side end of the absorbent element 20 and the inner end of the elastic member 42B. As a result, when worn, the contraction force of the elastic member 42B causes the part of the absorber 21 located on the outer side of the vertical slit 26 in the widthwise direction to bend inward and rise towards the body, acting as an obstacle for excrement diffusing in the width direction and preventing the excrement from leaking out.

The third distance D3 between the dorsal end of the absorbent element 20 and the horizontal slit 25 is longer than the fourth distance D4 between the dorsal end of the absorbent element 20 and the ventral end of the dorsal fixing part 35, and shorter than the fifth distance D5 between the dorsal end of the absorbent element 20 and the ventral end of the dorsal exterior body 3. As a result, when worn, the contraction force of the elastic member 42B causes the part of the absorbent body 21 located outside the lateral slit 25 in the front-to-rear direction to bend inward and rise towards the body, becoming an obstacle to the excrement diffusing in the front-to-rear direction and preventing the excrement from leaking out.

The fifth distance D5 between the rear end of the absorbent element 20 and the ventral end of the rear exterior body 3 is shorter than the sixth distance D6 between the rear end of the absorbent element 20 and the ventral end of the vertical slit 26. This allows excrement temporarily retained in the horizontal slit 25 or vertical slit 26 to be diffused toward the middle of the absorbent body 21 in the front-rear direction.

Next, the materials and characteristic features of the top sheet 10 and the like will be described in order.
(Surface sheet)
The top sheet 10 is formed of a nonwoven fabric with or without holes, a porous plastic sheet, or the like. The raw fiber of the nonwoven fabric is not particularly limited. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, and polyamides, regenerated fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of these can be exemplified. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as the spunlace method, the spunbond method, the thermal bond method, the meltblown method, the needle punch method, the air-through method, and the point bond method. For example, if flexibility and drape are required, the spunlace method is a preferred processing method, and if bulkiness and softness are required, the thermal bond method is a preferred processing method.
It is preferable that a hydrophilic agent be applied to the surface of the topsheet 10 in advance.

(Back seat)
The back sheet 11 is formed of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet or the like, or a nonwoven fabric in which a waterproof film is interposed to ensure that the material is substantially liquid-impermeable (in this case, the back sheet 11 is composed of the waterproof film and the nonwoven fabric). Of course, in addition to the above, a liquid-impermeable and moisture-permeable material that has been favorably used in recent years from the viewpoint of preventing stuffiness can also be exemplified. As a sheet made of a material having liquid impermeability and moisture permeability, for example, a microporous sheet obtained by kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction can be exemplified. Furthermore, a sheet that has been made liquid-impermeable without using a waterproof film by a method such as a nonwoven fabric using microdenier fibers, a method of strengthening leak-proofness by applying heat or pressure to reduce the voids in the fibers, or a method of coating with a highly water-absorbent resin, a hydrophobic resin, or a water-repellent agent can also be used as the back sheet 11.

(Absorber)
The absorbent body 21 can be formed by a fiber assembly. As the fiber assembly, in addition to stacked staple fibers such as cotton-like pulp and synthetic fibers, a filament assembly obtained by opening a tow (fiber bundle) of synthetic fibers such as cellulose acetate as necessary can be used. The fiber basis weight can be, for example, about 100 to 300 g/m ² when stacking cotton-like pulp or staple fibers, and can be, for example, about 30 to 120 g/m ² when the filament assembly is used. The fineness of the synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament assembly, the filaments may be non-crimped fibers, but are preferably crimped fibers. The crimp degree of the crimped fibers can be, for example, about 5 to 75, preferably 10 to 50, and more preferably 15 to 50, per inch. Furthermore, uniformly crimped fibers are often used.

The absorbent body 21 preferably contains superabsorbent polymer particles, and in particular, at least in the liquid receiving area, it is desirable for the superabsorbent polymer particles (SAP particles) to be dispersed substantially throughout the thickness of the fiber aggregate.

If there are no SAP particles in the upper, lower, and middle parts of the absorbent 21, or if there are only a few, they cannot be said to be "dispersed throughout the thickness direction." Therefore, "dispersed throughout the thickness direction" includes not only a form in which the SAP particles are "uniformly" dispersed throughout the thickness direction of the fiber aggregate, but also a form in which the SAP particles are "unevenly distributed" in the upper, lower, and/or middle parts but are still dispersed in each of the upper, lower, and middle parts. It also does not exclude a form in which some SAP particles do not penetrate into the fiber aggregate but remain on its surface, or a form in which some SAP particles pass through the fiber aggregate and are on the packaging sheet 22.

The term "superabsorbent polymer particles" includes not only "particles" but also "powders". The particle size of the superabsorbent polymer particles can be the same as that used in this type of absorbent article, and is preferably 1000 μm or less, particularly 150 to 400 μm. There are no particular restrictions on the material of the superabsorbent polymer particles, but a water absorption capacity of 40 g/g or more is preferable. The superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles, and examples of the particles that can be used include starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked products of sodium carboxymethylcellulose, and acrylic acid (salt) polymers. The shape of the superabsorbent polymer particles is preferably the powder-like shape that is usually used, but other shapes can also be used.

The highly absorbent polymer particles preferably have a water absorption speed of 70 seconds or less, and particularly 40 seconds or less. If the water absorption speed is too slow, the liquid supplied to the absorbent body 21 is likely to flow back out of the absorbent body 21, which is known as backflow.

The basis weight of the highly absorbent polymer particles can be appropriately determined according to the absorption amount required for the application of the absorbent body 21. Therefore, although it cannot be generally stated, it can be set to 50 to 350 g/ ^m2 . If the basis weight of the polymer is less than 50 g/ ^m2 , it becomes difficult to ensure the absorption amount. If it exceeds 350 g/ ^m2 , not only will the effect be saturated, but the excess of highly absorbent polymer particles will cause an uncomfortable gritty feeling.

(packaging sheet)
The packaging sheet 22 is formed of tissue paper, particularly crepe paper, nonwoven fabric, polylaminated nonwoven fabric, a sheet with small holes, etc. However, it is preferable that the sheet is one from which the superabsorbent polymer particles do not escape. When using nonwoven fabric instead of crepe paper, hydrophilic SMMS (spunbond/meltblown/meltblown/spunbond) nonwoven fabric is particularly suitable, and the material that can be used is polypropylene, polyethylene/polypropylene, etc. The fiber weight is preferably 5 to 40 g/ ^m2 , particularly 10 to 30 g/ ^m2 .

(Gathered sheet)
The gathered sheet 31 can be made of the same material as the top sheet 10, and it is preferable that a water repellent agent is applied to the surface in advance.

The waterproof sheet 32 can be a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of a nonwoven fabric, or a laminated sheet in which a nonwoven fabric is layered and fixed onto a plastic film.

The elastic member 33 can be made of rubber thread with a thickness of 470 to 620 dtex, and is stretched to an elongation rate of 200 to 250%.

(Inner sheet)
The inner sheet 40 of the dorsal exterior body 3 and the inner sheet 45 of the ventral exterior body 4 are preferably formed of nonwoven fabric. The type of nonwoven fabric is not particularly limited, and as the material fiber, for example, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, as well as regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used, and as the processing method, spunlace method, spunbond method, thermal bond method, air-through method, needle punch method, etc. can be used. However, long fiber nonwoven fabrics such as spunbond nonwoven fabric, SMS nonwoven fabric, and SMMS nonwoven fabric are preferable in that they can achieve both texture and strength. The nonwoven fabric can be used in a single piece or in a stack of multiple pieces. In the latter case, it is preferable to bond the nonwoven fabrics to each other with an adhesive or the like. When using nonwoven fabric, the fiber basis weight is preferably 10 to 50 g/m ² , particularly 15 to 30 g/m ² .

(Outer sheet)
The outer sheet 41 of the dorsal exterior body 3 and the outer sheet 46 of the ventral exterior body 4 can be made of the same material as the inner sheet 40 of the dorsal exterior body 3 and the inner sheet 45 of the ventral exterior body 4.

(Expandable member)
The elastic member 42 of the dorsal exterior body 3 and the elastic member 47 of the ventral exterior body 4 can be made of rubber thread having a thickness of 470 to 620 dtex, and are provided stretched to an elongation rate of 200 to 250%.

<Explanation of terms used in the specification>
When used in this specification, the following terms have the following meanings, unless otherwise specified in the specification.

- "Front-to-back (vertical) direction" means the direction connecting the ventral side (front) and the dorsal side (rear), and "width direction" means the direction perpendicular to the front-to-back direction (left-right direction).
"Front side" means the side closest to the wearer's skin, and "back side" means the side farther from the wearer's skin. "Front side" means the side of a member closest to the wearer's skin, and "back side" means the side farther from the wearer's skin.
"MD direction" and "CD direction" refer to the flow direction (MD direction) in the manufacturing equipment and the transverse direction (CD direction) perpendicular to it, one of which is the front-rear direction of the product, and the other is the width direction of the product. The MD direction of a nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. Fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned, and can be determined, for example, by a measurement method based on the fiber orientation test method based on the zero-distance tensile strength of TAPPI standard method T471, or a simple measurement method that determines the fiber orientation direction from the tensile strength ratio in the front-rear direction and the width direction.
- "Deployed" means a flat deployed state without contraction or sagging.
"Elongation rate" refers to a value when the natural length is taken as 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.
"Gel strength" is measured as follows. 1.0 g of superabsorbent polymer is added to 49.0 g of artificial urine and stirred with a stirrer. The resulting gel is left in a thermo-hygrostat at 40°C x 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a curd meter (I.techno Engineering: Curdmeter-MAX ME-500).
- "Artificial urine" is a mixture of 2 wt% urea, 0.8 wt% sodium chloride, 0.03 wt% calcium chloride dihydrate, 0.08 wt% magnesium sulfate heptahydrate, and 97.09 wt% ion-exchanged water, and is used at a temperature of 40 degrees unless otherwise specified.
- "Basis weight" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%) until it reaches a constant weight. Pre-drying refers to bringing the sample or test piece to a constant weight in an environment at a temperature of 100°C. Note that pre-drying is not necessary for fibers with an official moisture regain of 0.0%. Using a template (100mm x 100mm) for sampling, cut out a sample measuring 100mm x 100mm from the test piece in a constant weight state. Measure the weight of the sample and multiply it by 100 to calculate the weight per square meter, which is the basis weight.
"Thickness" is automatically measured using an automatic thickness measuring device (KES-G5 handy compression tester) under the conditions of a load of 0.098 N/cm ² and a pressurized area of 2 cm ² .
"Water absorption" is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resins".
"Water absorption rate" is the "time to the end point" when 2 g of superabsorbent polymer and 50 g of physiological saline are used and the "water absorption rate test method for superabsorbent resins" according to JIS K7224-1996 is performed.
- If no specification is given regarding the environmental conditions for a test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (the test location shall be a temperature of 23±1°C and a relative humidity of 50±2%).
・Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not in the natural length state.

This invention can be used in absorbent articles such as disposable diapers.

Reference Signs List 1: inner body 2: outer body 3: dorsal side outer body 4: ventral side outer body 10: top sheet 11: back sheet 20: absorbent element 21: absorbent body 22: packaging sheet 25: horizontal slit 26: vertical slit 30: three-dimensional gather 35: dorsal side fixing part 36: ventral side fixing part 40: inner sheet 41: outer sheet 42: elastic member 42A: elastic member (first elastic member)
42B Elastic member (second elastic member)
D1 First distance D2 Second distance D3 Third distance D4 Fourth distance D5 Fifth distance D6 Sixth distance

Claims (3)

An inner body formed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent element between the top sheet and the back sheet;
An exterior body formed of a rectangular dorsal exterior body and a rectangular ventral exterior body is provided on the opposite body side of the interior body,
The absorbent element is formed of an absorbent body that absorbs bodily waste and a wrapping sheet that covers the absorbent body,
A horizontal slit extending in the width direction and a vertical slit extending in the front-rear direction are provided on the back side of the absorbent body on the body side,
The vertical slit extends in a ventral direction from both side ends of the horizontal slit ,
The rear exterior body is formed of an inner sheet made of a nonwoven fabric, an outer sheet made of a nonwoven fabric, and an elastic member extending in the width direction between the inner sheet and the outer sheet at a predetermined interval in the front-rear direction,
In a plan view, the elastic member is formed of a first elastic member extending in the width direction and provided on a rear side portion of the rear exterior body from the rear end portion of the absorbent body, and a second elastic member separated in the width direction and provided on a ventral side portion of the rear exterior body from the rear end portion of the absorbent body,
A disposable diaper characterized in that, when viewed in a plane, a first distance between the widthwise side end of the absorbent element and the vertical slit is shorter than a second distance between the widthwise side end of the absorbent element and the widthwise inner end of the second elastic member . a water-repellent three-dimensional gather is provided on both sides of the absorbent element in the width direction to prevent leakage of excrement discharged onto the top sheet in the width direction;
The three-dimensional gathers are fixed to the body side of the absorbent element via a top sheet at the back side fixing portion and the ventral side fixing portion,
2. The disposable diaper according to claim 1, wherein, in a plan view, a third distance between the rear end of the absorbent element and the horizontal slit is longer than a fourth distance between the rear end of the absorbent element and the ventral end of the rear fixed portion, and shorter than a fifth distance between the rear end of the absorbent element and the ventral end of the rear outer body. 3. The disposable diaper according to claim 2, wherein, in a plan view, a fifth distance between the rear end of the absorbent element and the ventral end of the rear outer body is shorter than a sixth distance between the rear end of the absorbent element and the ventral end of the vertical slit.

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