JP7064876B2 - Absorbent article - Google Patents

Description

The present invention relates to absorbent articles such as disposable diapers.

The absorbent article such as the disposable diaper described in Patent Document 1 has a front waist circumference area (ventral portion) arranged around the front waist circumference of the wearer and a rear waist circumference region (dorsal portion) arranged around the back waist circumference of the wearer. It has a side) and an inseam area that is located in the inseam of the wearer. The absorption core that absorbs the wearer's body fluid extends from the anterior girth region to the posterior girth region.

In the absorbent article described in Cited Document 1, the absorbent core has a pair of non-stacked portions extending along the anterior-posterior direction of the absorbent article. The pair of non-stacked portions are located symmetrically with respect to a center line extending in the anteroposterior direction through the center of the absorbent article in the width direction. The non-stacked fiber portion extends in the front-rear direction from the front waist circumference area to the rear waist circumference area. The non-stacked portion is composed of through holes in which no core forming material constituting the absorption core is present.

Japanese Unexamined Patent Publication No. 2017-38915

As a result of diligent research, the inventor of the present application has found the following problems. That is, when the wearer wears the absorbent article, the inseam area of the absorbent article, particularly near the center of the absorbent article in the anteroposterior direction, is sandwiched between the wearer's legs so as to be centered in the width direction. It transforms so that it is crushed toward it. Along with this deformation, the region behind the center of the absorbent article in the anteroposterior direction also tends to deform toward the center in the width direction. However, if the region behind the center of the absorbent article in the anteroposterior direction is deformed so as to collapse toward the center in the width direction, it becomes difficult to secure a space (area of the absorption core) for accommodating stool on the buttocks side. It is easy to cause stool leakage.

Therefore, an absorbent article that can secure a space for accommodating stool on the buttocks side while worn is desired.

The absorbent article according to one aspect is an inseam arranged in the front-rear direction, the width direction orthogonal to the front-back direction, the front waist circumference area, the rear waist circumference area, and the front waist circumference area and the rear waist circumference area. It has a region and an absorption core provided at least in the inseam region. A fold line for folding the absorbent article in half extends along the width direction in the inseam region. The absorption core has, at least in the inseam region, an inwardly constricted region in the width direction and a pair of grooves formed on both sides with respect to the center of the absorbent article in the width direction. The constricted area extends in the anteroposterior direction with respect to the fold line. The absorption core has a rear widening portion that widens as the distance between the pair of grooves increases rearward. The front end edge of the rear widening portion is located on the front side of the folding line and in a region overlapping the constricted region.

It is a schematic diagram of the absorbent article which concerns on one Embodiment. It is a development plan view of the absorbent article which concerns on one Embodiment. It is sectional drawing of the absorbent article along the line AA of FIG. It is a top view of the absorption core of an absorbent article. It is a schematic diagram of the absorption core which received the force inward in the width direction in the inseam region.

(1) Outline of Embodiment At least the following matters will be clarified by the description of this specification and the accompanying drawings.

The absorbent article according to one aspect is an inseam arranged in the front-rear direction, the width direction orthogonal to the front-back direction, the front waist circumference area, the rear waist circumference area, and the front waist circumference area and the rear waist circumference area. An absorbent article comprising a region and at least an absorbent core provided in the inseam region, wherein a fold line for folding the absorbent article in half extends along the width direction in the inseam region. The absorption core comprises, at least in the inseam region, an inwardly constricted region in the width direction and a pair of grooves formed on both sides with respect to the center of the absorbent article in the width direction. The constriction region extends in the anteroposterior direction with respect to the fold line, and the absorption core has a rear widening portion that widens as the distance between the pair of grooves toward the rear, and the front end edge of the rear widening portion. Is located in a region in front of the fold line and overlapping the constricted region.

According to this aspect, due to the constricted area of the absorption core and the pair of grooves, the fold line of the inseam area and the area in front of it are crushed toward the center in the width direction by being sandwiched by both legs of the wearer. It is easily deformed, that is, it is easily deformed so that the groove is closed. Since the wearer's legs often move in a position corresponding to the front side of the fold line during wearing, the wearer can easily move the legs.

Further, the pair of grooves has a rear widening portion that widens as the distance between the pair of grooves toward the rear, and the front end edge of the rear widening portion is a region that overlaps the constricted region on the front side of the fold line. To position. Since the front end edge of the rear widening portion is located in the region where it overlaps with the constricted region, a pair of grooves in the rear portion of the constricted region makes it easy for the absorption core to collapse inward in the width direction, but a pair as the wearer goes toward the buttocks. The width between the grooves can be widened. This makes it possible to secure a space for accommodating the stool in the rear part of the constricted area, that is, the area to which the stool is attached.

In addition, the length between the boundary line (stretch marks) between the wearer's buttocks and legs increases from the inseam of the wearer toward the dorsal side. By locating the front edge of the posterior widening portion in front of the fold line, between the pair of grooves as the length between the wearer's buttocks and leg boundaries (stretch marks) increases. You can widen the width of. This makes it easier to secure a space for accommodating stool on the buttocks side according to the wearer's body shape, and it is possible to suppress leakage of body fluid.

According to a preferred embodiment, the trailing edges of the pair of grooves are located within the constricted region in the anterior-posterior direction.

That is, the rear edge of the pair of grooves is located within the range of the constricted region, and the pair of grooves does not extend to the rear side of the constricted region. As a result, in the region behind the movable range of the wearer's leg, the absorption core is less likely to collapse inward in the width direction, and it becomes easier to secure a space for accommodating stool.

According to a preferred embodiment, the pair of grooves does not reach the outer edge of the absorption core in the width direction.

As a result, it is possible to prevent the absorption cores from being divided by the pair of grooves and to prevent the absorption cores adjacent to each other across the grooves from being deformed so as to overlap each other. As a result, in the width direction, the absorption core tends to have a cup shape that easily holds the body fluid and a curved shape that matches the shape of the body.

According to a preferred embodiment, the absorption core has a narrowest portion in the constricted region where the length of the absorption core in the width direction is the shortest, and the narrowest portion of the absorption core is in the anteroposterior direction. It extends along.

According to this aspect, since the narrowest portion of the absorption core extends along the front-rear direction, the region where the absorption core is easily crushed in the width direction becomes longer. This makes it easier for the wearer to move the legs with the absorbent core sandwiched between them.

According to a preferred embodiment, the narrowest portion of the absorption core extends rearward of the fold line.

According to this aspect, since the narrowest portion of the absorption core extends to the rear of the fold line, the region where the absorption core is easily crushed in the width direction extends to the rear. This makes it easier for the wearer to move the legs further to the rear.

According to a preferred embodiment, the pair of grooves has a front widening portion that expands as the distance between the pair of grooves moves forward.

Since the distance between the pair of grooves serving as the deformation starting point of the absorption core 51 is widened also on the ventral side, it becomes easy to secure the absorption area of the body fluid on the ventral side, and the leakage of the body fluid can be further suppressed.

According to a preferred embodiment, the distance between the pair of grooves in the inseam region is ⅘ or more of the maximum width of the absorption core in the width direction.

According to this aspect, since the space between the pair of grooves is wide to some extent, a wide area between the pair of grooves can be secured. This makes it possible to maintain the area of the absorption core between the pair of grooves.

According to a preferred embodiment, the absorption core has the narrowest portion of the constriction region in which the length of the absorption core is the shortest in the width direction, and the outer edge of the pair of grooves in the width direction is the said. It is located inside the narrowest portion of the absorption core.

As a result, it is possible to suppress the division of the absorption core by the pair of grooves, and it is possible to suppress the deformation of the absorption cores adjacent to each other across the groove so as to overlap each other. As a result, in the width direction, the absorption core tends to have a cup shape that easily holds the body fluid and a curved shape that matches the shape of the body.

According to a preferred embodiment, the leak-proof cuff extending in the front-rear direction has a pair of leak-proof cuffs arranged on both sides of the center in the width direction, and the rear end of the pair of leak-proof cuffs. The rear side of the edge has a cuff joint portion that is joined so as not to stand up toward the skin surface side, and the pair of virtual lines extending the pair of grooves rearward in the direction in which the pair of grooves extend has the width. It passes outside the cuff joint in the direction.

The pair of imaginary lines in which the pair of grooves are extended rearward in the direction in which the pair of grooves are extended is a line in which wrinkles are likely to be formed, which is the starting point at which the absorption core is crushed inward in the width direction. Since this line passes outside the cuff joint in the width direction, the area of the absorption core can be secured in the entire region between the pair of leak-proof cuffs in the dorsal region.

According to a preferred embodiment, the high-rigidity region is provided in a region behind the fold line and including the center in the width direction, and the high-rigidity region includes the fold line and the high-rigidity region. It is defined by a region having a rigidity higher than the rigidity in the region between, and the length of the high-rigidity region in the anteroposterior direction is longer than the length from the folding line to the front end edge of the high-rigidity region.

Since the high-rigidity region has a higher rigidity than the rigidity in the region between the folding line and the high-rigidity region, it is difficult to deform inward in the width direction. Therefore, the absorption core is less likely to be deformed inward in the width direction in the high-rigidity region and the region behind it. This makes it easier to secure a space for accommodating stool on the buttocks side, and it is possible to suppress leakage of body fluid.

According to a preferred embodiment, at least a portion of the high stiffness region is located posterior to the trailing edge of the pair of grooves.

The high-rigidity region is located behind the pair of grooves that make it easier to crush the absorption core inward in the width direction, ensuring the ease of movement of the wearer's legs in the inseam and the area of the absorption core on the buttocks side. Can be compatible with each other.

According to a preferred embodiment, the high-rigidity region extends from a region overlapping the pair of grooves when viewed from the width direction to the rear side of the trailing edge of the pair of grooves.

The area where the fold line is formed in the inseam area is the part most easily crushed in the width direction due to the pair of grooves. The region where the high-rigidity region overlaps the pair of grooves when viewed from the width direction is a portion that is less likely to collapse in the width direction than the region where the fold line is formed due to the high-rigidity region. Further, the portion extending to the rear side of the rear end edge of the pair of grooves in the high rigidity region is a portion that is hard to be crushed in the width direction because there is no pair of grooves. As described above, the absorption core becomes less likely to collapse in the width direction from the position of the fold line in the inseam region toward the rear. As a result, the area of the absorption core can be further secured toward the rear.

According to a preferred embodiment, the high rigidity region is provided in the region between the pair of grooves in the width direction.

By providing the high-rigidity region between the pair of grooves that are the starting points for deforming the absorption core, the entire high-rigidity region can be flattened and the area of the absorption core can be further secured.

According to a preferred embodiment, the high stiffness region is adjacent to the pair of grooves in the width direction.

Since the high-rigidity region is adjacent to the pair of grooves, the entire region between the pair of grooves can be flattened and the area of the absorption core can be further secured.

According to a preferred embodiment, the high-rigidity region is provided in a region that overlaps with the constricted region when viewed from the width direction.

In the region behind the fold line, a high-rigidity region is provided in a region overlapping the constricted region when viewed from the width direction. As a result, the absorbent core is less likely to collapse in the width direction as it shifts backward from the movable range of the wearer's leg. Therefore, the area of the absorption core can be secured more toward the rear.

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

FIG. 1 is a schematic diagram of an absorbent article according to an embodiment. FIG. 2 is a development plan view of the absorbent article according to the embodiment. FIG. 2 shows an extended state in which the absorbent article is extended to a state in which wrinkles are not formed in the expanded state in which the side locking portion described later is expanded. FIG. 3 is a cross-sectional view of the absorbent article along line AA of FIG. FIG. 4 is a plan view of the absorption core of the absorbent article.

The absorbent article 10 has an anteroposterior direction L and a width direction W that are orthogonal to each other in the deployed state. The anterior-posterior direction L is defined by the direction extending to the anterior side (ventral side) and the posterior side (dorsal side) of the body. In other words, the anteroposterior direction L is a direction extending anteroposteriorly in the deployed absorbent article 10. Further, the absorbent article 10 has both the front-rear direction L and the width direction W orthogonal to each other in the thickness direction T.

The absorbent article 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 of the wearer. The rear waist circumference area S2 is a region facing the rear waist circumference of the wearer. The inseam area S3 is located in the inseam of the wearer and is an area arranged between the front waist area S1 and the rear waist area S2.

In the present embodiment, the absorbent article 10 may have a front waistline member 20, a rear waistline member 30, and an absorbent body 40. The front waist circumference member 20 is arranged in the front waist circumference region S1. The rear waist circumference member 30 is arranged in the rear waist circumference region S2. The front waist circumference member 20 and the rear waist circumference member 30 may be made of a sheet such as a non-woven fabric.

The front waistline member 20 may have, for example, a non-skin surface side sheet 14 overlapped in two layers and a cover sheet 70 overlapped in two layers. In the embodiment shown in FIG. 4, the non-skin surface side sheet 14 and the cover sheet 70 are composed of an integral sheet. Specifically, the cover sheet 70 is configured by folding back the non-skin surface side sheet 14 at the front end edge of the front waist circumference region S1. Instead, the non-skin surface side sheet 14 and the cover sheet 70 may be composed of separate sheets.

In the embodiment shown in FIG. 2, a first elastic member 71 extending in the width direction W is provided near the rear end edge 70e of the cover sheet 70. Further, the cover sheet 70 may be joined to the absorbent main body 40 by a joining member 74, for example, a hot melt adhesive, on the front side of the first elastic member 71.

A fold line FL that bisects the absorbent article 10 back and forth may pass through the inseam region S3. The fold line FL extends along the width direction W. That is, in the state shown in FIG. 1, the absorbent article 10 is folded in half with the folding line FL extending along the width direction W as a base point.

Side locking portions 60 may be provided at the end portion of the front waist circumference region S1 in the width direction W and the end portion of the rear waist circumference region S2 in the width direction W. The side locking portion 60 is defined by a portion in which the end portion of the front waist circumference region S1 in the width direction W and the end portion of the rear waist circumference region S2 in the width direction W are locked to each other.

In a state where the end portion of the front waist circumference region S1 in the width direction W and the end portion of the rear waist circumference region S2 in the width direction W are locked by the side locking portion 60, the absorbent article 10 is attached to the wearer. A waist opening 62 through which the torso is passed and a pair of leg openings 66 into which the wearer's legs are inserted are formed. The waist circumference opening edge 64 forming the waist circumference opening 62 may be defined by the front end edge of the front waist circumference member 20 and the rear end edge of the rear waist circumference member 30. Further, the leg circumference opening edge 68 forming the leg circumference opening 66 includes a side side 40 l of the absorbent main body 40 extending in the front-rear direction L, a side 20 l located on the rear side of the front waist circumference member 20, and a rear waist circumference member 30. It may be defined by a side 30 liters located on the front side of the.

Here, FIG. 2 shows a state in which the absorbent article 10 is unfolded by releasing the locking in the side locking portion 60. The side locking portion 60 may extend along the front-rear 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 region S1 and the inseam region S3 may be defined by the rear end edge of the side locking 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 locking portion 60 provided on the rear waist circumference member 30.

The rear waist circumference region S2 may be provided with one or a plurality of elastic members 32 that can be expanded and contracted in the width direction W. Instead, the elastic member 32 in the rear waist circumference region S2 may be composed of an elastic sheet that can be expanded and contracted in the width direction W.

Further, the front waist circumference region S1 may be provided with one or a plurality of second elastic members 22 that can be expanded and contracted in the width direction W. The second elastic member 22 is composed of elastic threads. The second elastic member 22 may be provided on the non-skin surface side of the absorbent main body 40 in the front waist circumference region S1. Further, the telescopic sheet 90 that can be expanded and contracted in the width direction W may be provided in the front waist circumference region S1. The elastic sheet 90 may be provided in a region that does not overlap with the second elastic member 22 in the thickness direction T.

The absorbent main body 40 is arranged so as to straddle the front waist circumference member 20 and the rear waist circumference member 30. That is, the absorbent main body 40 extends over the front waist circumference region S1, the rear waist circumference region S2, and the inseam region S3.

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.

The absorbent body 40 contains at least the absorber 50. Further, the absorbent body 40 may have a skin surface sheet 41 located on the skin surface side of the absorber 50 and a non-skin surface sheet 42 located on the non-skin surface side of the absorber 50. The skin surface sheet 41 may cover the absorber 50 on the skin surface side of the absorber 50. The non-skin surface sheet 42 may cover the absorber 50 on the non-skin surface side of the absorber 50.

The skin surface sheet 41 may be made of a liquid-permeable sheet such as a non-woven fabric or a perforated plastic film. The skin surface sheet 41 may be composed of one sheet. Instead, the skin surface sheet 41 may be composed of a laminated sheet in which a plurality of sheets are laminated to each other.

The non-skin surface sheet 42 may include an impermeable sheet. The impermeable sheet may be composed of an impermeable film such as a plastic film. The non-skin surface sheet 42 may be composed of one sheet. Instead, the non-skin surface sheet 42 may be composed of a laminated sheet in which a plurality of sheets are laminated to each other. In this case, at least one of the plurality of sheets may have impermeable property.

The absorber 50 may include an absorption core 51 and a core wrap 52 that encloses the absorption core. The absorbent core 51 may contain, for example, ground pulp or a highly absorbent polymer (SAP), or a mixture thereof. The core wrap 52 may be made of, for example, a tissue or a non-woven fabric.

The absorption core 51 is arranged at least in the inseam region S3. Preferably, the absorption core 51 may extend from the front girth region S1 to the rear girth region S2 in the front-rear direction L.

The absorption core 51 may have a constricted region CA confined inward in the width direction W at least in the inseam region S3. The constricted area CA may extend in the anteroposterior direction L with respect to the folding line FL. The narrowest portion LA of the absorption core 51 in the width direction W may be provided in the inseam region S3. Further, the narrowest portion of the absorption core 51 may extend along the front-rear direction L. In this case, the fold line FW may pass through the constricted region CA of the absorption core 51.

The absorbent body 40 may have side sheets 43 that cover both sides of the skin surface sheet 41 in the width direction W. The side sheet 43 may be made of a sheet such as a non-woven fabric or a perforated plastic film.

The absorbent body 40 may have a pair of leakproof cuffs 46. The pair of leakage-proof cuffs 46 extend in the front-rear direction L between the front waist circumference region S1 and the rear waist circumference region S2, and are arranged on both sides of the center of the absorbent article 10 in the width direction W. The pair of leak-proof cuffs 46 are defined by an upright portion (part of range B in FIG. 2) that can stand up toward the wearer's skin.

The leak-proof cuff 46 may be composed of a side sheet 43 and a third elastic member 47 provided on the side sheet 43. The third elastic member 47 is configured to be expandable and contractible in the front-rear direction. The third elastic member 47 may include one or a plurality of rubber threads. As a specific example, the inner portion of the side sheet 43 in the width direction W is folded outward, and the third elastic member 47 is arranged at the folded portion of the side sheet 43. Further, the inner edge of the side sheet 43 in the width direction W is not joined to the skin surface sheet 41, and constitutes a free end capable of rising from the skin surface sheet 41.

The posterior side of the trailing edge of the pair of leak-proof cuffs 46 has a cuff joint 46j that is non-standingly joined towards the skin surface side. In the illustrated example, the cuff joint portion 46j is defined by the joint portion between the side sheet 43 and the skin surface sheet 41. The side sheet 43 and the skin surface sheet 41 may be joined by an adhesive such as a hot melt adhesive. Further, although not shown, the front side of the front end edge of the pair of leak-proof cuffs 46 may also have a cuff joint portion that is joined so as not to stand up toward the skin surface side.

The leak-proof cuff 46 has an upright fulcrum 46a and an upright apex 46b. The standing fulcrum 46a and the standing apex 46b extend in the front-rear direction L from the front waist circumference region S1 to the rear waist circumference region S2. The standing fulcrum 46a is a point that does not stand and corresponds to the root of the leakage-proof cuff 46. In the present embodiment, the upright fulcrum 46a corresponds to the inner edge line in the width direction W of the joint portion between the side sheet 43 and the skin surface sheet 41. The standing apex 46b corresponds to the apex of the leak-proof cuff 46 when the leak-proof cuff 46 stands up. That is, the standing apex 46b is the free end of the leak-proof cuff 46.

The absorbent body 40 may have a pair of gathers 48 in the outer region of the pair of leakproof cuffs 46 in the width direction W. The pair of gathers 48 may extend in the front-rear direction L from the front waist circumference region S1 to the rear waist circumference region S2.

The pair of gathers 48 may be composed of a fourth elastic member 49 attached to a sheet constituting the absorbent body 40. The fourth elastic member 49 may be, for example, one or a plurality of rubber threads. Instead, the fourth elastic member 49 may be, for example, an elastic sheet having elasticity. The fourth elastic member 49 is joined to the sheet constituting the absorbent main body 40 in a state of being stretched from the natural state. As a result, the fourth elastic member 49 acts to contract the absorbent main body 40 in the front-rear direction L, and can form gathers.

(3) Configuration of Absorption Core Next, the configuration of the absorption core 51 will be described in detail. FIG. 4 is a plan view of the absorption core 51 of the absorbent article 10.

The absorption core 51 may have a pair of rear slits 56 located on both sides of the center in the width direction W in the rear waist circumference region S2. Further, the absorption core 51 may have a central slit 59 between the pair of rear slits 56. Further, the absorption core 51 may have a pair of side slits 58 located on both outer edges of the absorption core 51 in the width direction W. Here, the slit is a region where the absorbing material constituting the absorbing core 51 is substantially zero.

The absorption core 51 may have a pair of grooves 54 formed on both sides with respect to the center of the absorbent article 10 in the width direction W. Here, the "groove" of the absorption core 51 is a concept including both a recess formed in the absorption material constituting the absorption core 51 and a region where the basis weight of the absorption material is zero.

According to this aspect, the folding line FL of the inseam region S3 and the region in front of it are sandwiched by both legs of the wearer by the constricted region CA of the absorption core 51 and the pair of grooves 54, thereby being centered in the width direction W. It transforms so that it is crushed toward. That is, the absorption core 51 is easily deformed inward in the width direction W so that the groove 54 is closed (see FIG. 5). Since the wearer's legs often move at a position corresponding to the front side of the fold line FL during wearing, the wearer can easily move the legs.

Here, as described above, the narrowest portion LA having the shortest length of the absorption core 51 in the width direction W in the constricted region CA may extend along the front-rear direction L. Further, it is preferable that the narrowest portion LA of the absorption core 51 extends to the rear of the folding line FL. As a result, the region where the absorption core 51 is easily crushed in the width direction becomes longer. Therefore, the wearer can more easily move the leg with the absorption core 51 sandwiched between the wearer.

The absorption core 51 may have a rear widening portion 54r that widens as the distance between the pair of grooves 54 toward the rear. The front end edge 54s of the rear widening portion 54r may be located on the front side of the folding line FL and in a region overlapping the constricted region CA. More preferably, the front end edge 54s of the rear widening portion 54r may be located in a region on the front side of the folding line FL and overlapping with the narrowest portion LA of the constricted region CA. Here, the front end edge 54s of the rear widening portion 54r is defined by the point that the distance between the pair of grooves 54 in the inseam region S3 starts to widen from the region where the distance between the pair of grooves 54 is the narrowest toward the rear. Will be done.

Since the front end edge 54s of the rear widening portion 54r is located in the region overlapping the constricted region CA, the absorption core 51 is easily crushed inward in the width direction W by the pair of grooves 54 in the rear portion of the constricted region CA, but on the rear side. That is, the width between the pair of grooves 54 can be widened toward the buttocks side of the wearer. As a result, the absorption core 51 is less likely to collapse inward in the width direction in the rear portion of the constricted region CA, that is, the region to which a large amount of body fluid is adhered, so that the area of the absorption core 51 in the region can be secured.

In addition, the length between the boundary line (stretch marks) between the wearer's buttocks and legs increases from the inseam of the wearer toward the dorsal side. By locating the front end edge 54s of the rear widening portion 54r on the front side of the fold line FL, a pair of grooves are formed according to the increase in length between the boundary line (flesh crack line) between the wearer's buttocks and the leg. The width between 54 can be widened. This makes it easier to secure the area of the absorption core 51 on the buttocks side according to the wearer's body shape, and it is possible to suppress the leakage of body fluid.

From the viewpoint of facilitating the movement of the wearer's legs during wearing, the pair of grooves 54 may reach the rear side of the fold line FL.

Further, it is preferable that the rear side edges of the pair of grooves 54 are located within the range of the constricted region CA in the front-rear direction L. That is, the rear side edges of the pair of grooves 54 are located within the range of the constricted region CA, and the pair of grooves 54 do not extend to the rear side of the constricted region CA. As a result, in the region behind the movable range of the wearer's legs, the absorption core 51 is less likely to collapse inward in the width direction, and it becomes easier to secure the area of the absorption core 51.

In the illustrated example, the trailing edge of the pair of grooves 54 is located posterior to the narrowest portion LA of the absorption core 51. That is, the trailing edges of the pair of grooves 54 are located within the region where the width of the absorption core 51 is widened. As a result, the region in which the absorption core 51 is difficult to collapse inward in the width direction gradually expands toward the rear, so that it becomes easier to secure the area of the absorption core 51 toward the rear from the fold line.

The distance between the pair of grooves 54 in the inseam region S3 may be 1/4 or more of the maximum width of the absorption core 51 in the width direction W. This makes it possible to secure a space between the pair of grooves 54. As a result, even in the inseam region S3, the area of the absorption core 51 can be maintained at a minimum between the pair of grooves 54.

The pair of grooves 54 do not reach the outer edge of the absorption core 51 in the width direction W. More preferably, the outer edges of the pair of grooves 54 in the width direction W are located inside the width direction W with respect to the narrowest portion LA of the absorption core 51. As a result, it is possible to prevent the absorption core 51 from being divided by the pair of grooves 43, and to prevent the absorption cores 51 adjacent to each other across the groove 54 from being deformed so as to overlap each other. Therefore, in the width direction W, the absorption core 51 tends to have a cup shape that easily holds the body fluid and a curved shape that matches the shape of the body.

It is preferable that the pair of virtual lines IL in which the pair of grooves 54 are extended rearward in the direction in which the pair of grooves 54 extend, that is, in the direction in which the rear widening portion 54r extends, pass outside the cuff joint portion 46j in the width direction W. This virtual line IL is a line in which wrinkles are likely to be formed, which is a starting point at which the absorption core 51 is crushed inward in the width direction W. That is, wrinkles of the absorption core 51 are likely to be formed on the virtual line IL. Since the virtual line IL passes outside the cuff joint portion 46j in the width direction W, wrinkles of the absorption core 51 are unlikely to be formed in the region between the cuff joint portions 46j. Therefore, in the region at the rear end of the pair of leak-proof cuffs 46, the absorption core 51 is less likely to collapse inward in the width direction in the entire region between the pair of leak-proof cuffs 46, and it becomes easy to secure the area of the absorption core. ..

The absorption core 51 preferably has a front widening portion 54f that expands as the distance between the pair of grooves 54 moves forward. Since the distance between the pair of grooves 54, which is the starting point of deformation of the absorption core 51, is widened also on the ventral side, it becomes easier to secure the area of the absorption core also on the ventral side, and the leakage of body fluid can be further suppressed. ..

The front side edges of the pair of grooves 54 are located in the inseam area S3 and do not have to reach the front side area S1. Preferably, the anterior edges of the pair of grooves 54 are located within the constricted region CA of the absorption core 51.

The absorption core 51 may have a high rigidity region HR. The high-rigidity region HR is provided in a region behind the folding line FL and including the center in the width direction W. The high-rigidity region HR is defined by a region having a rigidity higher than the rigidity in the region between the folding line FL and the high-rigidity region HR. Preferably, the high rigidity region HR may be composed of an embossed region in which the absorption core 51 is compressed in the thickness direction.

The length of the high-rigidity region HR in the front-rear direction L is preferably longer than the length L1 from the folding line FL to the front end edge of the high-rigidity region HR. When the wearer wears the absorbent article 10, the inseam region S3 of the absorbent article, particularly near the center of the absorbent article 10 in the anteroposterior direction L, is sandwiched between the wearer's legs, so that the width direction W Deforms to be crushed toward the center of. Along with this deformation, the region behind the center of the absorbent article 10 in the front-rear direction L also tends to be deformed toward the center in the width direction W. This deformation facilitates the wearer's legs to move during wear (see also FIG. 5). According to this aspect, the high-rigidity region HR, which is longer in the front-rear direction L than the length L1 from the fold line FL to the front end edge of the high-rigidity region HR, is located behind the fold line FL and has a center in the width direction W. It is provided in the area including it. Since the high-rigidity region HR has a rigidity higher than the rigidity in the region between the folding line FL and the high-rigidity region HR, it is difficult to deform inward in the width direction W. Therefore, the absorption core 51 is less likely to be deformed inward in the width direction W in the high-rigidity region HR and the region behind it. Since the absorption core 51 is not easily crushed on the buttocks side, it becomes easy to secure the area of the absorption core 51, and the leakage of body fluid can be suppressed.

The front edge of the high-rigidity region HR is preferably located 5 to 15 mm behind the fold line FL. The position of the fold line FL in the inseam area S3 is a place where the wearer's legs are strongly pinched, and since this position is easily deformed inward, the wearer can easily move the legs while wearing. .. On the other hand, the area behind the position 5 to 15 mm behind the fold line FL is the area facing the vicinity of the wearer's buttocks, and the body fluid is secured by securing the area of the absorption core 51 in this area. Leakage can be further suppressed.

At least a part, preferably all of the high-rigidity region HR may be provided in a region overlapping the constricted region CA when viewed from the width direction W. Since the absorption core 51 is constricted within the range in which the wearer's legs can move, the wearer can easily move the legs. On the other hand, in the region behind the fold line FL, the high-rigidity region HR is provided in the region overlapping the constricted region CA when viewed from the width direction W. As a result, the absorption core 51 is less likely to be crushed in the width direction W as it shifts rearward from the movable range of the wearer's legs. Therefore, the area of the absorption core 51 can be further secured toward the rear. Since the rear part of the absorption core 51 is a portion facing the wearer's buttocks, the absorption core 51 should be wider in the width direction W than the front portion in order to cover the buttocks. Further, stool may also adhere to the rear of the absorption core 51, but the stool is not absorbed by the absorption core 51. Therefore, in order to suppress the leakage of stool, it is preferable to secure the area of the absorption core 51 toward the rear of the absorption core 51.

At least a part of the high-rigidity region HR is preferably located posterior to the trailing edge of the pair of grooves 54. Since the high-rigidity region HR is located behind the pair of grooves 54 that make it easy to crush the absorption core 51 inward in the width direction W, it is easy to move the wearer's legs in the inseam and the absorption core on the buttocks side. It is possible to secure the area of 51 at the same time.

Further, it is more preferable that the high-rigidity region HR extends from the region overlapping the pair of grooves 54 when viewed from the width direction W to the rear side of the trailing edge of the pair of grooves 54. That is, at least a part of the high-rigidity region HR may overlap with the pair of grooves 54 when viewed from the width direction W. The region where the fold line FL is formed in the inseam region S3 becomes a portion most easily crushed in the width direction W thanks to the pair of grooves 54. The region where the high-rigidity region HR overlaps with the pair of grooves 54 when viewed from the width direction W becomes a portion more difficult to collapse in the width direction W than the region where the fold line FL is formed due to the high-rigidity region HR. Further, the portion extending to the rear side of the rear end edge of the pair of grooves 54 in the high rigidity region HR is a portion that is not easily crushed by the width direction W because there is no pair of grooves 54. As described above, the absorption core 51 gradually becomes less likely to collapse in the width direction W from the position of the fold line FL in the inseam region S3 toward the rear. As a result, the area of the absorption core 51 can be secured wider toward the rear.

The length of the high-rigidity region HR in the width direction W is shorter than the maximum length of the absorption core 51 in the width direction W. As a result, the region outside the high-rigidity region HR in the width direction is deformed roundly according to the curvature of the wearer's body. In other words, the absorption core 51 curves like a cup in the width direction. As a result, the absorption core 51 has a shape for accommodating excrement such as body fluid, and leakage of body fluid is further suppressed.

The high-rigidity region HR is preferably provided inside the outer edge of the absorption core 51 in the width direction W, and more preferably inside the outer edge of the narrowest portion LA of the absorption core 51. In the width direction W, the region inside the constricted region CA is likely to receive a force inside the width direction W due to the force received from both legs of the wearer. Since the high-rigidity region HR is provided inside the outer edge of the absorption core 51 in the width direction W, the absorption core 51 is less likely to be deformed inward in the width direction W in the high-rigidity region HR. As a result, the absorption core 51 is less likely to be crushed on the buttocks side, and it becomes easier to secure the area of the absorption core 51, and leakage of body fluid can be suppressed. Further, if the high-rigidity region HR is provided inside the outer edge of the absorption core 51 in the width direction W, the high-rigidity region HR is unlikely to directly hit the wearer's legs, so that the discomfort given to the wearer is suppressed. Can be done.

It is more preferable that the high-rigidity region HR is provided in the region between the pair of grooves 54 in the width direction W. In this case, a part of the high-rigidity region HR may be located on the pair of grooves 54. By providing the high-rigidity region HR between the pair of grooves 54 that are the starting points for deforming the absorption core 51, the absorption core 51 can be easily crushed in the inseam region S3 in the width direction, and the entire high-rigidity region HR is flattened. The area of the absorption core 51 can be further secured.

It is more preferable that the high-rigidity region HR is adjacent to the pair of grooves 54 in the width direction W. As a result, the entire region between the pair of grooves 54 can be flattened, and the area of the absorption core 51 can be further secured.

As described above, the high-rigidity region HR may be composed of an embossed region. Since the embossed region can be embossed by pressing the absorption core 51, a highly rigid region HR can be formed without increasing the manufacturing cost of the absorbent article. Further, since the embossed region is a region where the absorption core 51 does not easily lose its shape, it becomes easy to secure the area of the absorption core 51.

The embossed region is preferably defined by a region including a plurality of dot-shaped embosses recessed from the skin surface side to the non-skin surface side. When the embossing formed in the embossed region is recessed from the skin surface side to the non-skin surface side, the high-rigidity region HR tends to bend convexly toward the non-skin surface side. Therefore, the high-rigidity region HR can be deformed into a gentle convex shape toward the non-skin surface side according to the curvature of the wearer's body while securing the area of the absorption core 51. As a result, the absorption core 51 tends to have a shape for accommodating excrement such as body fluid, and leakage of body fluid is further suppressed.

In the present embodiment, the numerical value regarding the "length" of each part of the absorbent article 10 is the absorbent article until the wrinkles (excluding the fold line FL) of the absorbent article 10 developed by releasing the side locking portion 60 disappear. Is measured in the stretched state.

Further, the rigidity of each part of the absorption core 51 can be measured by the method for measuring the rigidity and softness of Garley defined by the standard JIS L-1096 (2010). For example, first, a test piece having a width of 25 mm and a length of 38 mm is collected from the absorption core 51 to be measured. Affix cellophane tape to one end of the test piece, that is, where it is held by the chuck of the Galley flexibility tester. Next, align the lower end of the chuck of the Galley flexibility tester with the movable arm scale that matches the dimensions of the test piece. Next, the side of the test piece on which the cellophane tape is stretched is sandwiched between chucks. At this time, the length of the test piece applied to the pendulum of the Galley flexibility tester is set to 5 to 6 mm. Next, select the weight and mounting position of the auxiliary weight so that the memory of the Galley flexibility tester is between 3 and 6, and mount the auxiliary weight. Then, if the test piece is on the left side of the pendulum, press the switch for counterclockwise rotation, and if it is on the right side, press the switch for clockwise rotation to operate the movable arm. Then, the memory at the moment when the rotating rod of the pendulum separates from the test piece is read. One test piece is measured by both clockwise and counterclockwise rotation of the pendulum.

The rigidity and softness of the test piece can be calculated by the following formula.
Rigidity and softness (mN) = (25.4 x Wa + 50.8 x Wb + 101.6 x Wc) x (L x 25.4) ² x 3.375 x 10 ^-5 x (RG _r + RG _l ) / (2 x d)
Where Wa is the weight of the weight mounted at the top mounting position (g), Wb is the weight of the weight mounted at the center mounting position (g), and Wc is the weight of the weight mounted at the bottom. It is the weight (g) of the weight attached to the attachment position. L is a movable arm scale (inch). D is the width (mm) of the test piece. RG _r is a memory value at the moment when the rotating rod of the pendulum separates from the test piece when the pendulum rotates clockwise. RG _l is a memory value at the moment when the rotating rod of the pendulum separates from the test piece when the pendulum rotates counterclockwise. The rigidity of each part of the absorption core 51 is defined by the rigidity and softness obtained by the above measurement.

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

For example, in the above embodiment, the absorbent main body 40 is configured as a separate body from the front waist circumference member 20 and the rear waist circumference member 30. Instead, the absorbent body 40 may be integrally configured with the front girth member 20 and the rear girth member 30.

Further, in the above embodiment, the absorbent article 10 is a so-called pants-type absorbent article having a side locking portion 60. Instead, the absorbent article 10 may be a tape-type absorbent article. In this case, the absorbent article 10 does not have the side locking portion 60, and may have a fastening tape that detachably fixes the front waist circumference region S1 and the rear waist circumference region S2 to each other.

According to the above embodiment, it is possible to provide an absorbent article that can further secure a space for accommodating stool on the buttocks side while wearing.

10 Absorbent article 40 Absorbent body 50 Absorber 51 Absorbent core 54 Groove CA Constriction area HR High rigidity area S1 Front waist area S2 Rear waist area S3 Inseam area FL Fold line L Front-back direction W Width direction T Thickness direction

Claims (13)

In the front-back direction and
The width direction orthogonal to the front-back direction and
Front waist area and
The rear waist area and
The inseam area arranged between the front waist area and the rear waist area,
An absorbent article having at least an absorbent core provided in the inseam area.
A fold line for folding the absorbent article in half extends along the width direction in the inseam region.
The absorption core comprises, at least in the inseam region, an inwardly constricted region in the width direction and a pair of grooves formed on both sides with respect to the center of the absorbent article in the width direction.
The constricted area extends in the anteroposterior direction with respect to the fold line.
The absorption core has a rear widening portion that widens as the distance between the pair of grooves increases rearward.
The front end edge of the rear widening portion is located on the front side of the folding line and in a region overlapping the constricted region.
An absorbent article in which the distance between the pair of grooves in the inseam region is at least 1/4 of the maximum width of the absorbing core in the width direction . In the front-back direction and
The width direction orthogonal to the front-back direction and
Front waist area and
The rear waist area and
The inseam area arranged between the front waist area and the rear waist area,
An absorbent article having at least an absorbent core provided in the inseam area.
A fold line for folding the absorbent article in half extends along the width direction in the inseam region.
The absorption core comprises, at least in the inseam region, an inwardly constricted region in the width direction and a pair of grooves formed on both sides with respect to the center of the absorbent article in the width direction.
The constricted area extends in the anteroposterior direction with respect to the fold line.
The absorption core has a rear widening portion that widens as the distance between the pair of grooves increases rearward.
The front end edge of the rear widening portion is located on the front side of the folding line and in a region overlapping the constricted region.
A high-rigidity region is provided in a region behind the fold line and including the center in the width direction.
The high-rigidity region is defined by a region having a rigidity higher than the rigidity in the region between the folding line and the high-rigidity region.
The length of the high-rigidity region in the front-rear direction is longer than the length from the folding line to the front end edge of the high-rigidity region.
The highly rigid region is an absorbent article extending from a region overlapping the pair of grooves when viewed from the width direction to the rear side of the trailing edge of the pair of grooves. In the front-back direction and
The width direction orthogonal to the front-back direction and
Front waist area and
The rear waist area and
The inseam area arranged between the front waist area and the rear waist area,
An absorbent article having at least an absorbent core provided in the inseam area.
A fold line for folding the absorbent article in half extends along the width direction in the inseam region.
The absorption core comprises, at least in the inseam region, an inwardly constricted region in the width direction and a pair of grooves formed on both sides with respect to the center of the absorbent article in the width direction.
The constricted area extends in the anteroposterior direction with respect to the fold line.
The absorption core has a rear widening portion that widens as the distance between the pair of grooves increases rearward.
The front end edge of the rear widening portion is located on the front side of the folding line and in a region overlapping the constricted region.
A high-rigidity region is provided in a region behind the fold line and including the center in the width direction.
The high-rigidity region is defined by a region having a rigidity higher than the rigidity in the region between the folding line and the high-rigidity region.
The length of the high-rigidity region in the front-rear direction is longer than the length from the folding line to the front end edge of the high-rigidity region.
The high-rigidity region is an absorbent article adjacent to the pair of grooves in the width direction. In the front-back direction and
The width direction orthogonal to the front-back direction and
Front waist area and
Rear waist area and
The inseam area arranged between the front waist area and the rear waist area,
An absorbent article having at least an absorbent core provided in the inseam area.
A fold line for folding the absorbent article in half extends along the width direction in the inseam region.
The absorption core has, at least in the inseam region, an inwardly constricted region in the width direction and a pair of grooves formed on both sides with respect to the center of the absorbent article in the width direction.
The constricted area extends in the anteroposterior direction with respect to the fold line.
The absorption core has a rear widening portion that widens as the distance between the pair of grooves increases rearward.
The front end edge of the rear widening portion is located on the front side of the folding line and in a region overlapping the constricted region.
A high-rigidity region is provided in a region behind the fold line and including the center in the width direction.
The high-rigidity region is defined by a region having a rigidity higher than the rigidity in the region between the folding line and the high-rigidity region.
The length of the high-rigidity region in the front-rear direction is longer than the length from the folding line to the front end edge of the high-rigidity region.
The high-rigidity region is an absorbent article provided in a region overlapping the constricted region when viewed from the width direction. The absorbent article according to any one of claims 1 to 4 , wherein the trailing edge of the pair of grooves is located within the range of the constricted region in the anteroposterior direction. The absorbent article according to any one of claims 1 to 5 , wherein the pair of grooves does not reach the outer edge of the absorbing core in the width direction. The absorption core has the narrowest portion in the constricted region where the length of the absorption core in the width direction is the shortest.
The absorbent article according to any one of claims 1 to 6 , wherein the narrowest portion of the absorption core extends along the anteroposterior direction. The absorbable article according to claim 7 , wherein the narrowest portion of the absorption core extends to the rear of the fold line. The absorbent article according to any one of claims 1 to 8 , wherein the pair of grooves has a front widening portion that expands as the distance between the pair of grooves toward the front. The absorption core has the narrowest portion in the constricted region where the length of the absorption core in the width direction is the shortest.
The absorbent article according to any one of claims 1 to 9 , wherein the outer edge of the pair of grooves in the width direction is located inside the narrowest portion of the absorption core. The leak-proof cuff extending in the front-rear direction, having a pair of leak-proof cuffs arranged on both sides of the center in the width direction.
The posterior side of the trailing edge of the pair of leak-proof cuffs has a cuff joint that is non-standingly joined towards the skin surface side.
The one according to any one of claims 1 to 10 , wherein the pair of virtual lines extending the pair of grooves rearward in the direction in which the pair of grooves extends passes outside the cuff joint in the width direction. Absorbent article. A high-rigidity region is provided in a region behind the fold line and including the center in the width direction.
The high-rigidity region is defined by a region having a rigidity higher than the rigidity in the region between the folding line and the high-rigidity region.
The length of the high-rigidity region in the front-rear direction is longer than the length from the folding line to the front end edge of the high-rigidity region.
The absorbent article according to any one of claims 1 to 11 , wherein at least a part of the high-rigidity region is located behind the trailing edge of the pair of grooves. A high-rigidity region is provided in a region behind the fold line and including the center in the width direction.
The high-rigidity region is defined by a region having a rigidity higher than the rigidity in the region between the folding line and the high-rigidity region.
The length of the high-rigidity region in the front-rear direction is longer than the length from the folding line to the front end edge of the high-rigidity region.
The absorbent article according to any one of claims 1 to 12 , wherein the high-rigidity region is provided in a region between the pair of grooves in the width direction.

Images