JP2022162752A - absorbent article - Google Patents

Abstract

To prevent discharged urine from passing a slit provided on an absorber and leaking from a back part with vigor.SOLUTION: An absorbent article covers the abdominal part, a crotch part and a back part of a wearer who wears the absorbent article, and includes: an absorber having a pair of grooves extending in a longitudinal direction; and three-dimensional gathers which are arranged on both sides in a width direction of the absorber, adhere one end outside in the width direction to the absorber, and form an adhesive surface, make the other end ahead of standing lines formed at an end part inside the width direction of the adhesive surface a free end, and adhere the free end to the wearer's skin surface with elastic members. At least a part of an end part on the back part side of the pair of grooves faces in the direction crossing the standing lines of the three-dimensional gathers.SELECTED DRAWING: Figure 1

Description

The present invention relates to absorbent articles.

Absorbent articles such as disposable diapers, urine pads, and sanitary products have been developed (see, for example, Patent Document 1).

JP 2018-175885 A

It is conceivable that the absorbent body of the absorbent article is provided with grooves extending in a direction from the user's abdomen through the crotch to the back when worn by the user. In the case of such a structure, it is considered that urine excreted by the user passes through the grooves and spreads over the entire surface of the absorbent body. Therefore, it is assumed that the absorption efficiency of urine excreted by the user is improved. However, in such a structure it is assumed that urine passing through the dorsal end of the groove, for example, seeps onto the topsheet. Therefore, back leakage may occur.

Therefore, in the present invention, when an absorbent body of an absorbent article worn by a user is provided with grooves extending in a direction from the abdominal side to the back side of the user, the velocity of urine passing through the ends in the longitudinal direction of the grooves is reduced. The purpose is to provide a technique for suppressing

In order to solve the above problems, in the present invention, the shape of the ends of the grooves in the longitudinal direction is devised so that urine passing through the grooves also flows in the width direction of the absorbent article.

Specifically, the present invention provides an absorbent article that covers the wearer's abdomen, crotch and back when worn by the wearer, the absorbent article having a pair of longitudinally extending grooves; Standing lines, which are arranged on both sides in the width direction of the absorbent body, adhere one end of the width direction outer side to the absorbent body to form an adhesion surface, and are lines formed at the width direction inner end of the adhesion surface. a three-dimensional gather having the other end of the tip as a free end and biased by an elastic member so as to be in close contact with the skin surface of the wearer, at least of the ends on the back side of the pair of grooves A part of the absorbent article is oriented in a direction intersecting the standing line of the three-dimensional gathers.

At least a part of the ends of the pair of grooves on the abdomen side may face in a direction intersecting the standing line of the three-dimensional gathers.

The end portions of the pair of grooves may be substantially fan-shaped, and the substantially fan-shaped arc portions of the end portions may be formed in a direction intersecting the standing line of the three-dimensional gather from the extending direction of the pair of grooves. .

The pair of grooves are bent in the width direction from a position corresponding to the crotch portion toward the end portion, and the extending direction of the end portions of the pair of grooves is a direction that intersects the standing line of the three-dimensional gather. can be

The width of the end portion may be wider than the width of the pair of grooves at the position corresponding to the crotch portion.

The depth of the end portion may gradually decrease from the position corresponding to the crotch portion toward the position corresponding to the back portion.

The pair of grooves includes a bottom surface of the groove, an inclined line rising toward the center in the width direction, and an inclined line rising toward the left and right ends in the width direction, and the inclined lines rising toward the left and right ends in the width direction are: The inclination may be smaller than the inclined line rising toward the center in the width direction.

It extends in the width direction of at least one end of the pair of grooves in the longitudinal direction, is provided in a state of being stretched in the width direction, and is contracted so that the side of the end in the width direction becomes the end. and a first stretchable member that is stretchable in a direction in which the width of the portion increases.

a second stretchable member which is provided at a predetermined distance in the longitudinal tip direction from the dorsal end of the absorbent body when the absorbent article is worn by the wearer and which is stretchable in the width direction; In addition, the interval between the pair of grooves may be such that contraction of the end portion in the width direction by a predetermined length or more due to contraction of the second elastic member is suppressed.

According to the present invention, when the absorbent body of the absorbent article worn by the user is provided with grooves extending in the direction from the abdomen to the back of the user, the grooves extend in the direction from the abdomen to the back of the user. , the flow velocity of urine passing through the longitudinal ends of the groove can be reduced and the flow direction can be changed, so back leakage can be suppressed.

FIG. 1 is an external perspective view of a diaper according to an embodiment. FIG. 2 is an example of a developed view of a diaper. FIG. 3 illustrates an outline of forming slits in the absorber. FIG. 4 is an example of a developed view of a diaper according to the first modified example. FIG. 5 is an example of a developed view of a diaper according to a second modified example. FIG. 6 is an example of a developed view of a diaper according to a third modified example. FIG. 7 is a first example of a widthwise sectional view of a diaper. FIG. 8 is a second example of a cross-sectional view in the width direction of the diaper. FIG. 9 is an example of a developed view of a diaper according to a fourth modified example.

Hereinafter, absorbent articles according to embodiments of the present invention will be described with reference to the drawings. The configurations of the following embodiments are examples, and the present invention is not limited to the configurations of these embodiments.

<Embodiment>
In the present embodiment, a pants-type disposable diaper (which is an example of the "absorbent article" in the present application, and hereinafter simply referred to as a "diaper") has a front body and a back facing the user's abdomen. The longitudinal direction is the direction that connects the back body that is arranged on the back. Between the front body (one side in the longitudinal direction) and the back body (the other side in the longitudinal direction) (the center in the longitudinal direction), a crotch part is arranged at the user's crotch (arranged facing the crotch). is located. In addition, in a state where the paper diaper is worn by the user (hereinafter abbreviated as "wearing state"), the side facing the user's skin (inner side in the worn state) is the skin side, and the opposite side of the skin side (wearing state) is the skin side. The outer side in the folded state) is the non-skin side. Furthermore, the direction connecting the skin surface side and the non-skin surface side is defined as the thickness direction, and the direction orthogonal to both the longitudinal direction and the thickness direction is defined as the width direction. In addition, viewing from the thickness direction is defined as planar view.

FIG. 1 is an external perspective view of a diaper according to this embodiment. The diaper 1 includes a crotch region 1B corresponding to the crotch region covering the private part of the user when worn, a front body region 1F positioned in front of the crotch region 1B and corresponding to the user's front body, It has a back body region 1R which is positioned behind the crotch region 1B and corresponds to the user's back body.

In the diaper 1, a top sheet, an absorbent body, a back sheet, and a cover sheet 4 are laminated in this order from the skin side (only the cover sheet 4 is shown in FIG. 1). The top sheet has liquid permeability in part or in its entirety. Therefore, in the state where the diaper 1 is worn, the liquid excreted by the user permeates through the top sheet, which may come into contact with the user's skin. Then, it is absorbed by the absorbent body arranged on the non-skin surface side of the top sheet. Examples of materials that can be used for the top sheet include woven fabrics, nonwoven fabrics, and porous films. Moreover, the top sheet may have hydrophilicity.

An absorbent body capable of absorbing and retaining liquid is arranged from the front body region 1F to the back body region 1R around the crotch region 1B (details will be described later). The absorber contains short fibers of cellulosic fibers such as pulp fibers, rayon fibers, or cotton fibers, or short fibers obtained by hydrophilizing synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate. Granular absorbent resin such as SAP (Super Absorbent Polymer), which is a hydrophilic polymer having a cross-linked structure capable of absorbing and retaining water, is retained. The absorbent body may be wrapped with a liquid-permeable core wrap sheet so as to retain its structure.

For the cover sheet 4, for example, a non-woven fabric made of a liquid-impermeable thermoplastic resin can be used in order to suppress leakage of excrement. Examples of liquid-impermeable thermoplastic resins include polyethylene (PE) and polypropylene (PP). The cover sheet 4 is not limited to a single-layer structure, and may have a multi-layer structure having an inner cover sheet and an outer cover sheet.

The back sheet, like the cover sheet 4, is a sheet made of liquid-impermeable thermoplastic resin in order to prevent leakage of excrement. The backsheet is preferably made of a material that is also moisture-permeable in order to prevent stuffiness when worn.

In addition, in the diaper 1, waist gathers 3 (see the "second 2) is provided. For the same purpose, the diaper 1 is provided with three-dimensional gathers 3BL and 3BR at portions surrounding the user's thighs. The three-dimensional gathers 3BL, 3BR and the waist gathers 3 are in close contact with the user's skin due to the elastic force of the thread rubber. Therefore, the liquid discharged from the user's pubic area is absorbed by the absorber of the diaper 1 without hardly leaking from the diaper 1 . Moreover, the diaper 1 is fixed to the user's body in a state surrounding the user's waist and thighs. Since the diaper 1 is fixed to the user's body in this manner, the user can walk while wearing the diaper 1 .

Further, the diaper 1 is provided with tummy gathers 2 (an example of the "first elastic member" of the present disclosure) on the crotch side of the waist gathers 3 of the back body region 1R. The tummy gathers 2 are formed so as to be stretchable by attaching stretched rubber threads in the width direction to the cover sheet 4 which is the outer covering of the diaper 1 .

In the diaper 1 shown in FIG. 1, the front body region 1F, the crotch region 1B, and the back body region 1R are formed separately, and these three regions are arranged in the longitudinal direction and welded to each other. In the diaper 1, the front body region 1F, the crotch region 1B, and the back body region 1R may be integrally formed.

FIG. 2 is an example of a developed view of the diaper 1 viewed from the non-skin side. Note that the illustration of the cover sheet 4 and the back sheet 5 is omitted in FIG.

As shown in FIG. 2, the absorbent body 6 is divided into a plurality of parts in the longitudinal direction. Each absorber 6 is provided with a slit 8 (an example of a "groove" in the present disclosure). The slit 8 penetrates the absorber 6 in the thickness direction. For example, two slits 8 are provided side by side in the longitudinal direction so as to extend from the user's crotch region 1B to the back body region 1R when worn by the user. The number of slits 8 may be one or three or more. Moreover, the width of the central portion in the longitudinal direction of each slit 8 is uniform. Therefore, urine passes through the slit 8 and spreads uniformly on the absorbent body 6 .

Also, the ends 81 of the two slits 8 on the back body region 1R side (an example of the "first end" in the present disclosure) are arranged at substantially the same place in the longitudinal direction. In addition, the inner end in the width direction of the tummy gathers 2 (an example of the “second end” of the present disclosure) is a portion between such an end 81 and the end 82 of the slit 8 on the front body region 1F side. It is arranged on the outside in the width direction. A part of the rubber thread 22 forming the tummy gathers 2 is welded to the absorbent body 6 . A part of the rubber thread 22 may be welded to the back sheet 5 (described later) to which the absorbent body 6 is attached.

In this embodiment, the stretchable waist gathers 3 are formed mainly by the first contraction portion S1 formed in the first waist region RW1 and the second contraction portion S2 formed in the second waist region RW2. there is The waist gathers 3 improve the fit of the diaper 1 around the waist of the wearer due to the contractile forces of the first rubber threads 4F1, 4R1 and the second rubber threads 4F2, 4R2. A plurality of first rubber threads 4F1 and 4R1 are arranged parallel to each other at a constant interval A1 in the first contraction portion S1 of the waist gathers 3 . Further, a plurality of second rubber threads 4F2 and 4R2 are provided in parallel with each other at a constant interval A2 in the second shrinkage portion S2 of the waist gathers 3 . In addition, the space|interval of rubber thread here means the dimension by which the rubber thread next to each other is spaced apart in the longitudinal direction of the diaper 1 .

Further, in the present embodiment, the first rubber threads 4F1, 4R1 of the first waist region RW1 and the second rubber threads 4F2, 4R2 of the second waist region RW2 extend over the entire width of the cover sheet 4. . Therefore, after the diaper 1 is completed, the first rubber threads 4F1, 4R1 and the second rubber threads 4F2, 4R2 form a substantially annular stretchable member that circulates along the body opening. In other words, after the diaper 1 is completed, the waist gathers 3 (the first contracted portion S1 and the second contracted portion S2) are formed over the entire circumference in the waist direction.

Further, the thread rubbers 22 arranged on the tummy gathers 2 are provided in parallel with each other at a constant interval A3. In this embodiment, the spacing A3 between the rubber threads 22 of the tummy gathers 2 is set to be larger than the spacing A2 between the second rubber threads 4F2 and 4R2 in the second contracted portion S2 of the waist gathers 3. As a result, when the diaper 1 is put on with the body opening widened, the tummy gathers 2 that come into contact with the hipbone of the wearer are relatively easier to spread than the waist gathers 3 .

In addition, the absorbent body 6 on the back body region 1R side is arranged so as to overlap the longitudinal ends of the waist gathers 3 . In addition, the slit 8 is arranged away from the longitudinal end of the waist gathers 3 of the back body region 1R, for example, by about 130 mm (the M size with the shortest distance) (an example of the “predetermined interval” of the present disclosure). be. The basis weight of the absorbent body 6 in the region 83 between the lower end of the waist gathers 3 and the end 81 of the slit 8 is about 180 g/m ² (M size pulp with the lowest basis weight). basis weight). In addition, the waist gathers 3 are widened, for example, by about 44 cm when the diaper 1 is worn by the user, and the contraction force is about 2.4 N (M size in Example 4 of JP-A-2020-195550). The longitudinal length of the region 83 may be 130 mm or more, and the basis weight of the absorbent body 6 in the region 83 may be approximately 180 g/m ² or more.

Also, the absorbent body 6 on the front body region 1F side overlaps the waist gathers 3 . The ends 82 of the slits 8 extend to the vicinity of the ends of the waist gathers 3 in the longitudinal direction.

FIG. 3 illustrates an outline of forming slits 8 in the absorbent body 6 . FIG. 3A illustrates an outline of the process of forming slits 8 in the absorbent body 6. FIG. FIG. 3(B) illustrates a side view of the diaper 1 including the absorbent body 6 in which the slits 8 are formed.

As shown in FIG. 3A, a mesh plate 50 having a plurality of holes penetrating in the thickness direction is fixed at a predetermined position. A convex portion 51 projecting in the thickness direction is fixed to the central portion of the mesh plate 50 in the longitudinal direction. The convex portion 51 is tapered at both ends in the longitudinal direction so that the width gradually decreases upward. Further, the thickness of the central portion of the convex portion 51 in the longitudinal direction is uniform. The taper angle may be, for example, about 45 degrees.

Then, defibrated pulp, which is the raw material of the absorber 6, is fed from above in FIG. 3A toward the mesh plate 50. Then, as the air carrying the defibrated pulp passes through the holes of the mesh plate 50 , the defibrated pulp is deposited on the mesh plate 50 . Then, a mat-like absorber 6 is formed. On the other hand, since no holes are arranged in the portion where the convex portion 51 is provided, it does not become a passage for air carrying defibrated pulp. Therefore, defibrated pulp does not accumulate on the projections 51 . A hole having an inner diameter smaller than that of the mesh plate 50 may be provided in the convex portion 51 . Since the air permeability is lower than that of the mesh plate 50 even with such convex portions 51, defibrated pulp does not accumulate.

After the defibrated pulp is deposited on the mesh plate 50, the mesh plate 50 including the projections 51 is pulled downward as shown in FIG. 3(B). Then, an absorbent body 6 having slits 8 is formed. In addition, FIG. 3B shows an example in which slits 8 are formed in the absorbent body 6 arranged in the back body region 1R. Moreover, when the lower surface of the absorbent body 6 in FIG. Then, when the right end of the absorbent body 6 in FIG. 3(B) is incorporated into the diaper 1, it becomes the back side end in the longitudinal direction. Also, an end portion 81 of the slit 8 formed as shown in FIG. 3B is formed with a taper of about 45 degrees. Also, the depth of the central portion of the slit 8 in the longitudinal direction is uniform. Similarly, a slit 8 is formed in the absorbent body 6 arranged in the front body region 1F.

Further, as shown in FIG. 3B, the upper surface of the absorbent body 6 having the slits 8 formed thereon is attached to the back sheet 5 (not shown) coated with hot melt. However, the openings of the slits 8 are not attached to the back sheet 5 and assembled in a non-bonded state with the back sheet 5 . A part of the absorbent body 6 other than the vicinity of the slit 8 may be in a non-bonded state without being attached to the back sheet 5 .

[Action/effect]
According to the diaper 1 as described above, the outer side surfaces in the width direction of the ends 81 and 82 (an example of the “width direction side portions of the ends” of the present disclosure) are pulled outward in the width direction by the tummy gathers 2 . . Therefore, the width of the end portions 81 and 82 is increased. Thus, the velocity of urine passing longitudinally through the ends 81, 82 can be reduced. Thus, urine will seep into the topsheet in a slowed down state. Therefore, leakage of urine from the waist gathers 3 on the front body region 1F side or back leakage from the waist gathers 3 on the back body region 1R side is prevented.

Further, when the diaper 1 as described above is worn by the user, a force acts on the crotch region 1B of the diaper 1 in the direction of narrowing by the legs. Therefore, the width of the slit 8 is also narrowed, and the velocity of urine passing through the slit 8 in the longitudinal direction is increased. However, in the front body region 1F and the back body region 1R, the force acting in the direction of narrowing the width of the slit 8 is suppressed by the tensile force of the rubber thread 22 to the outside in the width direction. Therefore, the width of the slit 8 is maintained. Therefore, even if the velocity of urine increases in the central portion in the longitudinal direction of the slit 8, the velocity of urine passing through the ends 81 and 82 of the slit 8 is decelerated. Therefore, back leakage is prevented.

In addition, when the distance from the crotch region 1B of the diaper 1 to the ends 81 and 82 is sufficiently long, the change in the width of the slit 8 in the crotch region 1B is suppressed from reaching the ends 81 and 82. Also, the speed of urine passing through the ends 81 and 82 can be reliably reduced by the structure of the diaper 1 as described above. Therefore, leakage of urine from the waist gathers 3 on the front body region 1F side or back leakage from the waist gathers 3 on the back body region 1R side is prevented.

Further, according to the diaper 1 as described above, as shown in FIG. 3(B), the end portions 81 and 82 are tapered so that the depth gradually decreases toward the tip in the longitudinal direction. Therefore, urine can be guided in the direction of the top sheet. In addition, since the taper angle is as gentle as about 45 degrees, an increase in the urine velocity due to the taper is suppressed. It is possible to prevent urine from jumping up in the thickness direction of the diaper 1 due to the inability to control the direction of urine flow, and as a result, from leaking sideways.

Also, since the end portions 81 and 82 are tapered, the absorbent body 6 on the non-skin surface side of the tapered surface is thick. Therefore, it is suppressed that the vicinities of the ends 81 and 82 are crushed in the width direction. Therefore, an increase in the speed of urine passing through the ends 81 and 82 in the longitudinal direction can be suppressed. Therefore, leakage of urine from the waist gathers 3 on the front body region 1F side or back leakage from the waist gathers 3 on the back body region 1R side is prevented.

Also, as shown in FIG. 3(B), in order to form the slit 8 with tapered ends 81 and 82, the width of the convex portion 51 is gradually reduced at both ends in the longitudinal direction. A taper like this is provided. With such tapered projections 51, it becomes easy to pull out the mesh plate 50 from the absorber 6 in which defibrated pulp is deposited. Therefore, the absorbent body 6 having the slits 8 can be easily manufactured.

Further, according to the diaper 1 as described above, the opening of the slit 8 is not attached to the back sheet 5 . Therefore, urine flowing through the slit 8 can flow out to the back sheet 5 side. Therefore, it is suppressed that a large amount of urine reaches the end portion 81 or the end portion 82 of the slit 8 . Therefore, leakage of urine from the waist gathers 3 on the front body region 1F side or back leakage from the waist gathers 3 on the back body region 1R side is prevented.

Further, according to the diaper 1 as described above, part of the rubber thread 22 forming the tummy gathers 2 is welded to the absorbent body 6 . Therefore, the absorber 6 is pulled outward in the width direction. Therefore, the ends 81 and 82 of the slit 8 can be widened in the width direction. Therefore, the velocity of urine passing through the ends 81, 82 can be reduced. Thus, urine will seep into the topsheet in a slowed down state. Therefore, leakage of urine from the waist gathers 3 on the front body region 1F side or back leakage from the waist gathers 3 on the back body region 1R side is prevented.

Further, according to the diaper 1 as described above, the slit 8 is arranged at a distance of, for example, about 130 mm from the lower end of the waist gathers 3 of the back body region 1R. Further, the basis weight of the absorbent body 6 in the region 83 is approximately 180 g/m ² , and the shrinkage force of the waist gathers 3 is approximately 2.4N. Therefore, the contraction of the end portions 81 of the slit 8 in the width direction due to the contraction force of the waist gathers 3 is suppressed. Therefore, an increase in the velocity of urine passing through the end portion 81 is suppressed. Therefore, it is suppressed that urine seeps into the top sheet vigorously. Therefore, back leakage of urine from the waist gathers 3 on the back body region 1R side is prevented. The length of the region 83 in the longitudinal direction and the basis weight of the absorbent body 6 in the region 83 may be changed to such an extent that the end portions 81 of the slit 8 are not contracted in the width direction according to the shrinkage force of the waist gathers 3. .

Further, according to the diaper 1 as described above, it is possible to easily prevent back leakage without providing gathers for preventing back leakage. Therefore, the function of the diaper 1 can be improved without adding new members.

[Modification 1]
FIG. 4 is an example of a developed view of the diaper 1VA according to the first modified example when viewed from the non-skin side. As shown in FIG. 4, the diaper 1VA includes one undivided absorbent core 6A. The absorbent body 6A is provided with a concave portion 8A (an example of a "groove" in the present disclosure) recessed from the skin surface side to the non-skin side. For example, two concave portions 8A are provided side by side in the longitudinal direction. Further, the width of the central portion in the longitudinal direction of the concave portion 8A is uniform. Therefore, urine passes through the concave portion 8A and spreads uniformly over the absorbent body 6A. The recessed portion 8A may be formed, for example, by lightening the absorbent body 6A, or may be formed by compressing the absorbent body 6A.

Here, the end portion 81A that spreads in the width direction may be a region closer to the back body region 1R than the end portion on the crotch side in the longitudinal direction of the tummy gathers 2 . Alternatively, when the cover sheet 4 of the diaper 1 is formed from three separate pieces of the front body region 1F, the crotch region 1B, and the back body region 1R, the end portion 81A can cover the diaper 1 from the non-skin side. It may be a portion that overlaps with the back body region 1R when viewed from above. Alternatively, the end portion 81A may be a region that communicates with the end portion on the side of the back body region 1R in the longitudinal direction of the recessed portion 8A and has substantially the same width as the end portion.

Moreover, such an absorbent body 6A is arranged so as to overlap the lower end of the waist gathers 3 . Further, the end portion 81A of the recessed portion 8A on the back body region 1R side extends to the vicinity of the end portion in the longitudinal direction of the waist gathers 3 unlike the end portion 81 of the slit 8 of the embodiment. The end portion 81A is wider than the width of the central portion in the longitudinal direction of the concave portion 8A.

[Action/effect]
According to the diaper 1VA as described above, the outer side surface in the width direction of the end portion 81A is pulled outward in the width direction by the tummy gathers 2 . Furthermore, the width of the end portion 81A is wider than the width of the central portion in the longitudinal direction of the concave portion 8A. Therefore, even if the end portion 81A located near the waist gathers 3 shrinks in the width direction due to the contractile force of the waist gathers 3, the width of the end portion 81A is equal to the width of the central portion of the recessed portion 8A. narrowing is suppressed. Therefore, the speed of urine passing through the end portion 81A can be reduced. Thus, urine will seep into the topsheet in a slowed down state. Therefore, back leakage of urine from the waist gathers 3 on the back body region 1R side is prevented.

[Modification 2]
FIG. 5 is an example of a developed view of a diaper 1VB according to the second modification when viewed from the non-skin side. The absorber 6B of the diaper 1VB is provided with a concave portion 8B (an example of the "groove" of the present disclosure) that is concave when viewed from the skin surface side. The recesses 8B extend in the longitudinal direction and are arranged at predetermined intervals in the width direction. The diaper 1VB is provided with a stretchable sheet 23 (an example of the “stretchable member” of the present disclosure) in a region sandwiched between the end portions 81B of the recessed portion 8B in the width direction.

A thread rubber 24 is attached to the elastic sheet 23 while being stretched in the width direction of the diaper 1VB. In addition, the elastic sheet 23 is laminated between the absorbent body 6B and the top sheet in the thickness direction with the rubber thread 24 thus stretched. Further, the elastic sheet 23 is fixed to the absorbent body 6B by welding or the like. Note that the diaper 1VB is not provided with the tummy gathers 2. As shown in FIG.

[Action/effect]
According to the diaper 1VB as described above, even if the tummy gathers 2 are not provided, the elastic sheet 23 shrinks in the width direction, so that the inner side surfaces in the width direction of the two ends 81B (the "ends" of the present disclosure) (an example of "sides in the width direction of the part") are pulled further inward. Therefore, the width of the end portion 81B is wider than the width of the central portion in the longitudinal direction of the concave portion 8B. Further, even when affected by the contractile force of the waist gathers 3, the narrowing of the width of the end portion 81B is suppressed. Therefore, the speed of urine passing through the end portion 81B can be reduced. As a result, the urine seeps into the topsheet in a decelerated state. Therefore, back leakage of urine from the waist gathers 3 on the back body region 1R side is prevented.

[Modification 3]
FIG. 6 is an example of a developed view of a diaper according to a third modified example. Specifically, it is an example of a developed view of the diaper 1VC according to the third modified example as seen from the skin surface side. The absorber 6C of the diaper 1VC is provided with a concave portion 8C (an example of the "groove" of the present disclosure) that is concave when viewed from the skin surface side. The recesses 8C extend in the longitudinal direction (extending direction) and are arranged at predetermined intervals in the width direction (an example of a "pair of grooves" in the present disclosure). The width of the central portion of the recess 8C in the longitudinal direction is uniform. Therefore, urine passes through the concave portion 8C and spreads uniformly over the absorbent body 6C. The recessed portion 8C may be formed, for example, by subjecting the absorber 6C to lightening processing, or may be formed by pressing. Although this drawing relates to the back body region (back side) 1R of the diaper 1VC, the shape of the front body region 1F (abdomen side) may be the same as that of this drawing.

Side sheets 10L and 10R are provided on the skin side of the diaper, on the left and right sides in the width direction. The longitudinal ends of the side sheets 10L and 10R are adhered to the absorbent body 6C (and) by hot melt or the like. It is adhered to the back sheet, the cover sheet 4, etc., which constitute the non-skin side of the 1VC, by means of hot melt or the like to form an adhesive surface.

On the other hand, the side sheets 10L, 10R are not fixed at the widthwise inner end (the other end) of the longitudinal center of the sidesheets 10L, 10R and are free ends. An elastic member such as rubber thread is attached to the width direction free end sides of the side sheets 10L and 10R, and biased toward the longitudinal center portion. When the wearer puts on the diaper, the free ends of the side sheets 10L and 10R fold from standing lines formed at the boundaries between the widthwise inner ends of the adhesive surfaces on the left and right sides in the widthwise direction due to the biasing force of the elastic members. stand up. The side sheets 10L, 10R, which stand up on the skin side, adhere to the skin side and function as three-dimensional gathers 3BL, 3BR.

In this modification, the longitudinal tip portion 81C of the concave portion 8C of the diaper back portion 1R is wider than the width of the longitudinal central portion of the concave portion 8A, and spreads outward in the width direction in a substantially fan shape. In other words, the arc portion of the distal end portion 81C that spreads out in a substantially fan shape spreads from the direction along the extension line of the main portion of the recessed portion 8C, which is also the direction in which the waist gathers 3 exist, to the direction in which the side sheets 10L and 10R exist. there is The three-dimensional gathers 3BL, 3BR are present in the direction in which the side sheets 10L, 10R are present. In addition, tummy gathers 2 are present on the left and right sides of the longitudinal tip portion 81C. Therefore, it can be said that a part of the longitudinal tip portion 81C of the concave portion 8C is oriented in a direction that intersects the standing lines of the three-dimensional gathers 3BL and 3BR.

FIG. 7 is a first example of a widthwise sectional view of a diaper. Specifically, it is a cross-sectional view of the diaper 1VC of FIG. 6 taken along line AA. The diaper 1VC has a top sheet 7, an absorbent body 6C, a back sheet 5, and a cover sheet 4 which are laminated in this order from the skin side of the diaper 1VC. Hydrophobic side sheets 10L and 10R are provided from the cover sheet 4 to the side surface of the absorbent body 6C wrapped in the top sheet 7, and to the skin surface side width direction end of the absorbent body 6C wrapped in the top sheet 7. glued up to Since line AA is a cross section near the crotch part 1B of the diaper 1VC, the inner sides in the width direction of the side sheets 10L and 10R are free ends, and are biased by elastic members to form the three-dimensional gathers 3BL and 3BR. there is In the example of this figure, the concave portion 8C attached to the absorber 6C has a bottom surface where the thickness of the absorber is the thinnest, an inclined line rising toward the center in the width direction, and an inclined line rising toward the left and right ends in the width direction. The body fluid that has fallen into the concave portion 8C flows in the longitudinal direction while being evenly absorbed by the absorbent body 6C.

FIG. 8 is a second example of a cross-sectional view in the width direction of the diaper. The cutting position is the AA line shown in FIG. 6, as in FIG. In the example of this figure, the inclined line rising toward the center in the width direction of the groove portion 8C rises substantially vertically. On the other hand, the inclination angle of the inclined line rising toward the left and right ends in the width direction of the groove portion 8C is smaller than that of the inclined line rising toward the center in the width direction. Therefore, the urine that has fallen into and overflowed the recessed portion 8C tends to flow outward in the width direction.

[Action/effect]
In the diaper 1VC as described above, the longitudinal tip portion 81C of the concave portion 8C of the diaper back portion 1R widens outward in the width direction. Tummy gathers 2 are attached to the side surface of the longitudinal tip portion 81C. When the diaper 1VC is worn, the absorbent body 6C in the front body region 1F and the back body region 1R spreads due to the contractile force of the tummy gathers 2. As shown in FIG. Therefore, it is suppressed that the width of the end portion 81C becomes narrower than the width of the central portion of the recessed portion 8C. In this example, the urine that has not been absorbed by the groove 8C flows outward in the width direction of the diaper while being decelerated by the end 81C.

Here, three-dimensional gathers 3BL and 3BR are present on the outer side in the width direction of the absorber 6C. In addition, between the three-dimensional gathers 3BL, 3BR and the absorber 6C, there is a bag-like space that can temporarily hold urine, so that the urine can be drawn from the longitudinal tip 81C toward the three-dimensional gathers 3BL, 3BR. The flowing urine is absorbed by the absorber 6C while being held in the bag-like space. In this form, the main flow direction of the urine that flows through the concave portion 8C, reaches the end portion 81C, and is decelerated is the outside in the width direction, making it difficult for the urine to reach the waist gathers, thereby suppressing back leakage. Urine is held and absorbed in the bag-like space formed between the three-dimensional gathers 3BL, 3BR and the absorbent body 6C, so that it does not overflow outside the diaper 1VC.

Further, if the inclined lines on the three-dimensional gathers 3BL, 3BR side are made gentle as shown in FIG. 8, even if the groove portion 8C is narrowed, a certain degree of the narrowing is maintained between the three-dimensional gathers 3BL, 3BR and the absorber 6C. It flows into the bag-shaped space that was created. Therefore, even if the groove 8C temporarily fails to function as a urine flow path, urine will not overflow outside the diaper 1VC.

[Modification 4]
FIG. 9 is an example of a developed view of a diaper according to a fourth modified example. Specifically, it is an example of a developed view of the diaper 1VD according to the fourth modification as seen from the skin surface side. The absorber 6D of the diaper 1VD is provided with a concave portion 8D (an example of the "groove" of the present disclosure) that is concave when viewed from the skin surface side. In the crotch portion 1B, the recesses 8D extend in the longitudinal direction (extending direction) and are arranged at predetermined intervals in the width direction (an example of a "pair of grooves" in the present disclosure). However, the recess 8D is bent outward in the width direction in the back body region 1R shown in this figure. The recessed portion 8C may be formed, for example, by subjecting the absorber 6C to lightening processing, or may be formed by pressing.

The fact that the diaper 1VD is provided with three-dimensional gathers 3BR and 3BL is the same as in the third modification. Urine that has passed through the main portion of the recess 8D and reached the front body region 1F and the back body region 1R changes its flow direction due to the longitudinal tip portion 81D of the recess 8D bending outward in the width direction. It is discharged from the longitudinal extremity 81D facing directionally outward. And this longitudinal direction tip part 81D is directed to the direction where the standing line of three-dimensional gathers 3BL and 3BR exists. That is, it can be said that, also in this modified example, as in modified example 3, the longitudinal direction end portion 81D, which is a part of the concave portion 8D, is oriented in a direction that intersects the standing lines of the three-dimensional gathers 3BL and 3BR. Although this drawing relates to the back body region 1R (back side) of the diaper 1VD, the shape of the front body region 1F (abdomen side) may be the same as that of this drawing.

[Action/effect]
According to the diaper 1VD as described above, the urine that has flowed through the recess 8D flows outward in the width direction when it reaches the front body region 1F and the back body region 1R as the direction of the recess 8D changes. The urine discharged from the longitudinal tip portion 81D is guided as it is to the bag-shaped space formed between the three-dimensional gathers 3BL, 3BR and the absorbent body 6C, and is absorbed by the absorbent body 6C while being held. be. In this form, the direction of urine flow is outside the width direction of the diaper 1VD, so back leakage is suppressed. Further, since urine is held and absorbed in the bag-like space formed between the three-dimensional gathers 3BL, 3BR and the absorber 6C, it does not overflow outside the diaper 1VD.

[Other Modifications]
Instead of the slit 8 , a concave portion recessed from the skin surface side to the non-skin surface side extends in the longitudinal direction of the absorbent body 6 , and the depth of the end portion 81 or the end portion 82 is greater than the depth of the central portion of the slit 8 in the longitudinal direction. It can be taken deeply. According to such a diaper, the speed of urine passing through the end portion 81 or the end portion 82 can be further reduced. Therefore, leakage of urine from the waist gathers 3 on the front body region 1F side or back leakage from the waist gathers 3 on the back body region 1R side is reliably prevented.

Also, the tummy gathers 2 may not be arranged in the width direction of either the end portion 81 or the end portion 82 . Also, the end portion 81 or the end portion 82 may not be tapered. Also, a structure that can replace the taper (for example, a structure that is stepped in the longitudinal direction) may be provided. Also, the end portions 81 of the two slits 8 do not have to be arranged at substantially the same position in the longitudinal direction. Also, the width and depth of the central portion of the slit 8 in the longitudinal direction may not be uniform. Also, part of the rubber thread 22 forming the tummy gathers 2 may be welded to the sheet-like member (for example, the back sheet 5) to which the absorber 6 is attached. In such a case, the rubber thread forming the tummy gathers 2 and the absorbent body 6 are indirectly bonded. Moreover, the thread rubber forming the tummy gathers 2 may not be welded to the absorbent body 6 . Further, the diaper 1 may be a tape-type diaper in which the back body region 1R is fixed to the front body region 1F via tape.

The embodiments and modifications disclosed above can be combined.

1, 1VA, 1VB, 1VC, 1VD: diaper 1B: crotch area 1F: front body area 1R: back body area 2: tummy gathers 3: waist gathers 3BL, 3BR: three-dimensional gathers 4: cover sheet 5: back sheets 6, 6A , 6B, 6C, 6D: Absorber 8: Slits 8A, 8B, 8C, 8D: Recess 22: Rubber thread 23: Elastic sheet 24: Rubber thread 50: Mesh plate 51: Protrusions 81, 81A, 81B, 81C, 81D : Edge 82 : Edge 83 : Area

Claims (9)

An absorbent article that covers the wearer's abdomen, crotch and back when worn by the wearer,
an absorbent body having a pair of longitudinally extending grooves;
Arranged on the left and right in the width direction of the absorbent body, one end of the outer side in the width direction is bonded to the absorbent body to form an adhesive surface, and the tip of the standing line is a line formed at the inner end in the width direction of the adhesive surface a three-dimensional gather in which the other end is a free end, and the free end is biased by an elastic member so as to be in close contact with the wearer's skin;
provided with
At least a portion of the ends of the pair of grooves on the back side faces in a direction that intersects the standing line of the three-dimensional gathers.
absorbent article. At least a portion of the ends of the pair of grooves on the abdomen side faces in a direction that intersects the upright line of the three-dimensional gathers.
The absorbent article according to claim 1. The ends of the pair of grooves are substantially fan-shaped,
The substantially fan-shaped arc portion at the end portion is formed in a direction that intersects the standing line of the three-dimensional gather from the extending direction of the pair of grooves,
3. The absorbent article according to claim 1 or 2. The pair of grooves are bent in the width direction from a position corresponding to the crotch portion toward the end portion,
The extending direction of the ends of the pair of grooves is a direction that intersects the standing line of the three-dimensional gathers,
The absorbent article according to any one of claims 1-3. The width of the end portion is wider than the width of the pair of grooves at a position corresponding to the crotch portion,
The absorbent article according to claim 3 or 4. The depth of the end portion gradually becomes shallower from the position corresponding to the crotch portion toward the position corresponding to the back portion,
The absorbent article according to any one of claims 3-5. The pair of grooves includes a bottom surface of the groove, an inclined line rising toward the center in the width direction, and an inclined line rising toward the left and right ends in the width direction,
The inclined lines rising toward the left and right ends in the width direction are less inclined than the inclined lines rising toward the center in the width direction.
The absorbent article according to any one of claims 1-6. It extends in the width direction of at least one end of the pair of grooves in the longitudinal direction, is provided in a state of being stretched in the width direction, and is contracted so that the side of the end in the width direction becomes the end. a first stretchable member that is stretchable in the direction in which the width of the portion widens,
The absorbent article according to any one of claims 1-7. a second stretchable member which is provided at a predetermined distance in the longitudinal tip direction from the dorsal end of the absorbent body when the absorbent article is worn by the wearer and which is stretchable in the width direction; prepared,
The gap between the pair of grooves is a gap that suppresses contraction of the end portion in the width direction by a predetermined length or more due to contraction of the second elastic member.
The absorbent article according to claim 8.

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