JP7297426B2 - absorbent article - Google Patents

Description

The present invention relates to absorbent articles.

Conventionally, absorbent articles such as pants-type disposable diapers have been used. As an underpants-type disposable diaper, a so-called all-in-one type underpants-type diaper is known, which has an absorbent body for absorbing excrement and an outer covering body superimposed on the absorbent body. In such pants-type diapers, it is common that both sides of the outer body in the left-right direction are notched (leg holes) along the legs of the wearer, and leg elastics are provided along the notches. is. For example, Patent Literature 1 discloses a pants-type diaper in which elastic stretchable members 1 and 2 such as rubber threads are provided along the leg circumferences of a front body A and a back body B, respectively.

JP-A-4-28364

In conventional pants-type diapers, leg elastic members such as thread rubber are provided on both the front side (abdominal side) and the rear side (dorsal side) as in Patent Document 1, and when the diaper is worn, the leg elastic members are provided. The shrinkage of the member causes the absorbent body to be pulled back and forth. In this case, the fabric of the crotch part shrinks uniformly in the front-rear direction, and the space between the wearer's body (buttocks) and the absorbent body may become narrow, especially on the back side. If the space on the back side becomes narrower, there is a possibility that the excreted feces cannot be accommodated in the space inside the diaper, and the feces may leak to the outside.

The present invention has been made in view of the conventional problems as described above, and an object of the present invention is to provide an absorbent article that prevents feces from leaking from the dorsal side.

The main invention for achieving the above object is
An absorbent article comprising an absorbent main body and an outer covering arranged to overlap in the thickness direction of the absorbent main body,
The exterior body has a cutout portion curved along the leg circumference of the wearer,
Having a longitudinal direction and a width direction that intersect each other in the unfolded state of the absorbent article,
The notch has a dorsal notch located on the dorsal side of the center and a ventral notch located on the ventral side of the center in the longitudinal direction,
The exterior body is
It has a leg elastic member continuously provided along a part of the dorsal cutout and the ventral cutout,
It does not have a leg-surrounding elastic member along the ventral notch on the ventral side in the longitudinal direction from the part,
The absorbent main body has an absorbent core, a topsheet, and a backsheet,
The leg elastic member has a central region that is a portion along the width direction at the central portion in the width direction, and a curved region that is a portion that is curved outside the central region in the width direction,
In the leg elastic member, the ventral end of the curved region in the longitudinal direction is positioned inside the side ends of the absorbent main body and outside the side ends of the absorbent core in the width direction. is located
The absorbent article is characterized in that the contractile force of the leg elastic members in the central region is smaller than the contractile force of the leg elastic members in the curved region.
Other features of the present invention will become apparent from the description of the specification and accompanying drawings.

According to the present invention, it is possible to provide an absorbent article that does not easily leak feces on the dorsal side.

It is the schematic perspective view which looked at the diaper 1 from the ventral side. Fig. 2 is a plan view of the diaper 1 in an unfolded and stretched state as seen from the skin side; FIG. 3 is a schematic cross-sectional view showing the AA cross section in FIG. 2; 4A and 4B are diagrams illustrating formation of the feces accommodation space SP in the underpants-type diaper 1. FIG. FIG. 3 is a schematic plan view for explaining a specific arrangement of leg-hole elastic members 33. FIG.

At least the following matters will become apparent from the descriptions of this specification and the accompanying drawings.
An absorbent article comprising an absorbent main body and an outer covering arranged in layers in a thickness direction of the absorbent main body, wherein the outer covering includes cutouts curved along the legs of the wearer. and having a longitudinal direction and a width direction that intersect each other in the unfolded state of the absorbent article, and the notch portion is a dorsal notch located on the dorsal side of the center in the longitudinal direction and a ventral cutout located more to the ventral side than the center, and the exterior body is provided continuously along part of the dorsal cutout and the ventral cutout. , and does not have leg elastic members along the ventral side notch portion on the ventral side in the longitudinal direction from the part. Goods.

According to such an absorbent article, the absorbent main body and the exterior body are pulled from the ventral side to the dorsal side as the leg-surrounding elastic member arranged along the dorsal notch shrinks, and the fabric is stretched. are collected in the dorsal region. Then, the collected materials are deformed so as to protrude toward the non-skin side to form a feces accommodation space. As a result, it is possible to secure a space that can accommodate stool on the dorsal side and prevent stool from leaking.

Further, an absorbent article having an absorbent main body and an outer covering arranged to overlap in a thickness direction of the absorbent main body, wherein in the unfolded state of the absorbent article, longitudinal directions intersecting with each other having a width direction and a curved leg elastic member extending from the back waist to the crotch side,
It is characterized in that it does not have a curved leg elastic member extending from the abdominal waist to the crotch side, and the leg elastic member straddles the central position in the longitudinal direction from the dorsal side to the ventral side. An absorbent article is revealed.

According to such an absorbent article, as the leg elastic members extending from the back side waistline to the crotch side while straddling the longitudinal central position from the back side to the abdomen side are contracted, the absorbent main body and the outer covering body are contracted. is pulled from the ventral side to the dorsal side to collect the fabric in the dorsal region. Then, the collected materials are deformed so as to protrude toward the non-skin side to form a feces accommodation space. As a result, it is possible to secure a space that can accommodate stool on the dorsal side and prevent stool from leaking.

In this absorbent article, the absorbent main body has an absorbent core, and the leg elastic member has a central region, which is a portion along the width direction at the central portion in the width direction; and a curved region that is a portion that curves outward from the central region in a direction, and the contractile force of the leg elastic members in the central region is smaller than the contractile force of the leg elastic members in the curved region. Preferably, in the leg elastic member, the ventral end of the curved region in the longitudinal direction is located outside the absorbent core in the width direction.

According to such an absorbent article, the contractile force of the elastic members around the legs acts on both laterally outer regions of the absorbent core, and the relatively low-rigidity portions (such as the top sheet) of the absorbent main body are elongated. direction. As the top sheet or the like shrinks, the absorbent core tends to be pulled toward the back in the longitudinal direction. This facilitates the formation of a feces accommodation space.

In such an absorbent article, it is desirable that the leg elastic member is cut at least at one or more locations in the central region.

According to such an absorbent article, since the contractile force along the width direction acting on the central region by the leg elastic members becomes smaller, the absorbent core overlaps the leg elastic members in the central region. Shrinkage is easily suppressed. Therefore, it is possible to improve the absorbent performance of the absorbent article.

In this absorbent article, the leg elastic member has a central region along the width direction at the central portion in the width direction and a portion curved outside the central region in the width direction. A contraction force of the leg elastic member in the central region is smaller than a contraction force of the leg elastic member in the bending region, and the leg elastic member is in the bending region. It is preferable that the ventral end in the longitudinal direction is located on the ventral side of the position where the width of the exterior body in the width direction is the narrowest in the longitudinal direction.

According to such an absorbent article, the range in which the contractile force of the elastic member around the leg acts is widened in the longitudinal direction, and the region on the back side of the position where the width is the narrowest in the outer body is the entire back. You will be pulled to the side. As a result, the area of the fabric collected on the dorsal side is increased, so that the capacity of the formed feces storage space can be increased.

In this absorbent article, the leg elastic member has a central region along the width direction at the central portion in the width direction and a portion curved outside the central region in the width direction. A contraction force of the leg elastic member in the central region is smaller than a contraction force of the leg elastic member in the bending region, and the leg elastic member is in the bending region. It is desirable that the ventral end in the longitudinal direction is located on the dorsal side of the position where the width of the exterior body in the width direction is the narrowest in the longitudinal direction.

According to such an absorbent article, the range in which the contractile force of the leg-surrounding elastic member acts is narrowed in the longitudinal direction, and the portion of the ventral portion of the outer covering that is pulled toward the back is reduced. Therefore, the tightening along the leg openings on the back side (buttocks side) is weakened, and it is possible to soften the contact with the skin.

In such an absorbent article, it is desirable that the leg elastic member is colored in a color different from that of the absorbent main body and the outer covering.

According to such an absorbent article, the front and back of the absorbent article can be grasped at a glance by arranging the colored leg-surrounding elastic members on the dorsal side (rear side) where the feces storage space is formed. easier to do. As a result, it is possible to prevent the front and back of the absorbent article from being attached in the opposite direction.

In such an absorbent article, the absorbent body has an absorbent core, and the absorbent core contains 80% or more of the total weight of the absorbent core of superabsorbent polymer. , is desirable.

According to such an absorbent article, the thickness of the absorbent core can be reduced, and the rigidity can be reduced. Therefore, the absorbent core can be easily deformed three-dimensionally, and the feces storage space can be three-dimensionally formed on the dorsal side. As a result, excreted stool is more likely to be held in the stool storage space, and leakage of stool to the outside can be more easily suppressed.

In such an absorbent article, it is desirable that the absorbent main body has an absorbent core, and the absorbent core has a constant width in the width direction within a predetermined range in the longitudinal direction.

According to such an absorbent article, the length (width) in the width direction is likely to be kept substantially constant compared to the case where the absorbent core has an elliptical shape, etc., and the feces storage space formed by the absorbent core The width of is also easily kept constant. This makes it possible to increase the volume of feces that can be held inside the feces storage space, making it more difficult for feces to leak out.

In such an absorbent article, it is desirable that the central position of the absorbent main body is located on the ventral side of the central position of the outer covering in the longitudinal direction.

According to such an absorbent article, since the absorbent main body is arranged in advance toward the abdominal side, the area of the absorbent main body on the abdominal side becomes insufficient when the absorbent main body is pulled to the dorsal side. The fabric of the absorbent main body can be collected on the back side to form a feces accommodation space. As a result, the abdominal side of the absorbent article can easily absorb urine, and the dorsal side can easily retain feces.

In such an absorbent article, it is desirable that the leg elastic members are provided with an extension ratio of 2.0 to 3.5 times.

According to such an absorbent article, contraction force sufficient to pull the absorbent main body toward the dorsal side acts, and the absorbent main body can be pulled from the ventral side to the dorsal side to firmly form the feces accommodation space. can. In addition, by preventing the contractile force from becoming too large, the leg elastic members are prevented from digging into the wearer's skin (buttocks), and the wearer is less likely to feel uncomfortable when wearing the absorbent article. can do.

In such an absorbent article, it is desirable that the leg elastic member has a weight in grams per 10,000 m of 10 to 4,000 decitex.

According to such an absorbent article, it is possible to use a commercially available rubber thread as the leg-surrounding elastic member, so that the material cost can be reduced while firmly forming the feces accommodation SP.

In such an absorbent article, it is desirable that the leg elastic member is composed of one to three rubber threads.

According to such an absorbent article, when the absorbent article is worn, the leg elastic members are less likely to be cut, and appropriate stretchability can be exhibited along the leg openings.

Desirably, such absorbent articles are worn by infants and toddlers.

According to such an absorbent article, by optimizing the balance between the size of the feces storage space and the tightening strength of the leg openings by the elastic members around the legs, the absorbent article can be worn by a child with good fit. It is possible to suppress leakage of stool while maintaining

===Embodiment===
<Basic configuration of diaper 1>
As an example of absorbent articles handled in the present embodiment, the basic configuration of an underpants-type disposable diaper 1 (hereinafter also referred to as "diaper 1") will be described. FIG. 1 is a schematic perspective view of the diaper 1 as seen from the ventral side. FIG. 2 is a plan view of the diaper 1 in an unfolded and stretched state, viewed from the skin side. FIG. 3 is a schematic cross-sectional view showing the AA cross section in FIG. In addition, the "stretched state" in FIG. 2 means a state in which the product (diaper 1) is stretched without wrinkles. etc.) is extended until the dimensions match or are close to the dimensions of the member itself.

In the underpants-type state of FIG. 1, the diaper 1 has three mutually orthogonal directions, namely, the up-down direction, the left-right direction, and the front-rear direction. In the following, one side (upper side in FIG. 1) and the other side (lower side in FIG. 1) in the up-down direction in this pants-type state are also referred to as the "girth opening side" and the "crotch side", respectively. , the front side and the rear side in the front-rear direction are also referred to as the "ventral side" and the "dorsal side", respectively.

On the other hand, in the unfolded state of FIG. 2, the diaper 1 has the longitudinal direction, the width direction, and the thickness direction as three mutually orthogonal directions. Hereinafter, the one side and the other side in the longitudinal direction in the unfolded state are also referred to as the "ventral side" and the "dorsal side", respectively. Note that the width direction in the unfolded state of FIG. 2 is the same direction as the left-right direction in the underpants-type state of FIG. Therefore, hereinafter, the width direction is also referred to as the “left-right direction”. Further, the longitudinal direction in the unfolded state is the direction along the vertical direction of the pants-type state. Further, as shown in FIG. 3, the direction orthogonal to the vertical direction (longitudinal direction) and the horizontal direction (width direction) is defined as the "thickness direction", and the side that contacts the skin of the wearer is defined as the "skin side". Let the other side be the "non-skin side".

The diaper 1 of this embodiment has an absorbent body 10 and an outer body 20 . Then, from the unfolded state of FIG. 2, the absorbent main body 10 and the exterior body 20 are folded in half with the center position CL in the longitudinal direction (vertical direction) as the folding position. The faces facing each other at both ends in the direction are joined at the side edge portions 20es, 20es. As a result, the outer body 20 is annularly connected at the side edge portions 20es to form a pants-type diaper 1 having a waist opening BH and a pair of leg openings LH, LH as shown in FIG.

The absorbent main body 10 has a function of absorbing excrement such as urine, and is substantially rectangular in plan view as shown in FIG. are placed in The absorbent main body 10 has a liquid-absorbent absorbent core (absorbent body) 11 , a core wrap sheet 12 covering the outer peripheral surface of the absorbent core 11 , a top sheet 13 and a back sheet 14 . Leakage prevention walls 50 are provided on both sides of the absorbent main body 10 in the left-right direction.

The absorbent core 11 is formed by molding liquid-absorbent fibers such as pulp fibers into a predetermined shape, and 80% or more by weight of a superabsorbent polymer (so-called SAP) is mixed therein. In this embodiment, the absorbent core 11 has a substantially rectangular shape as shown in FIG. The core wrap sheet 12 is a liquid-permeable sheet member that covers the outer peripheral surface of the absorbent core 11, and can be made of tissue paper, non-woven fabric, or the like. However, the core wrap sheet 12 may not necessarily be provided.

The top sheet 13 is a liquid-permeable sheet member (inner layer sheet) that is arranged on the skin side in the thickness direction of the absorbent core 11 and comes into contact with the wearer's skin when the diaper 1 is worn. The top sheet 13 of this embodiment is formed of, for example, an air-through nonwoven fabric, a spunbond nonwoven fabric, or the like.

The backsheet 14 is a sheet member (outer layer sheet) that is arranged on the non-skin side in the thickness direction of the absorbent core 11 and constitutes the outer layer of the diaper 1 . In this embodiment, the backsheet 14 is a liquid-impermeable and moisture-permeable sheet member arranged on the non-skin side of the absorbent body 10, and is formed of, for example, a resin film. The provision of the back sheet 14 suppresses the movement (permeation) of moisture such as urine absorbed by the absorbent main body 10 toward the wearer's clothes.

The leak-proof wall portions 50 are arranged along the longitudinal direction (vertical direction of the diaper 1) on both sides of the absorbent main body 10 in the width direction. When the diaper 1 is worn, the leak-proof wall portions 50 stand up from both widthwise end portions of the absorbent body 10 to prevent excrement from leaking out of the diaper 1 . As shown in FIG. 2, the leak-proof wall portion 50 of the present embodiment includes first leak-proof wall joint portions 51 and 52 provided at both ends in the longitudinal direction, and longitudinal It is joined and fixed to the skin side of the absorbent main body 10 by the second leak-proof wall node joints 53 provided along the direction. A leak-proof wall elastic member 35 such as thread rubber is fixed to the widthwise inner end of the leak-proof wall portion 50 in a state of being stretched in the longitudinal direction. Based on the contractile force 35, the widthwise inner end region of the leak-proof wall portion 50 stands up on the wearer's skin side with the second leak-proof wall node joint portion 53 as a standing base point. The first leak-preventing wall joints 51 and 52 and the second leak-preventing wall nodal joint 53 can be formed with an adhesive such as a hot-melt adhesive.

The exterior body 20 has a skin-side sheet 21 and a non-skin-side sheet 22 . The skin-side sheet 21 is a flexible sheet member made of spunbond nonwoven fabric, SMS nonwoven fabric, or the like, and is provided on the skin side of the absorbent body 10 . An elliptical notch portion 21h cut out in an elliptical shape as shown in FIG. A part of the absorbent main body 10 (and the leak-proof wall portion 50) is exposed on the skin side in the thickness direction by the oval notch portion 21h, and excretion is absorbed by the absorbent main body 10 when the diaper 1 is worn. It becomes possible to

The non-skin side sheet 22 is a flexible sheet member made of spunbond nonwoven fabric, SMS nonwoven fabric, or the like, and is provided so as to cover the absorbent body 10 from the non-skin side. Both longitudinal ends of the non-skin-side sheet 22 protrude outward from both longitudinal ends of the skin-side sheet 21, and the protruding portions are folded back inward in the longitudinal direction and toward the skin in the thickness direction. to form folded portions 22ff and 22bf. In the diaper 1, the folded portions 22ff and 22bf are provided along the waist opening BH and cover the outer edges of the skin-side sheet 21 in the longitudinal direction. Therefore, the outer edge in the longitudinal direction of the skin-side sheet 21 is prevented from coming into direct contact with the wearer's skin, and a good feel to the skin can be achieved at the waist opening BH.

A plurality of ventral waist elastic members 31, 31 . (See FIGS. 2 and 3). The contractile force generated by the abdominal waist elastic member 31 imparts stretchability along the width direction (horizontal direction) to the abdomen side of the exterior body 20 . Similarly, in a predetermined region on the back side in the longitudinal direction of the exterior body 20, a plurality of back waist elastic members 32, 32, such as thread rubber, are stretched in the width direction at predetermined intervals in the longitudinal direction. are placed vacantly. The contractile force generated by the back-side waist elastic member 32 imparts stretchability along the width direction (horizontal direction) to the back side of the exterior body 20 .

Further, as shown in FIG. 2, a pair of notch portions 20c formed by cutting out a part of the exterior body 20 from both outer sides in the width direction to the inner side are formed between both ends in the longitudinal direction of the exterior body 20. is provided. The pair of notches 20c are portions forming the leg openings LH, LH in the pants-type diaper 1, and have a curved shape along the legs of the wearer. It is also the part that forms the leg gathers along the leg turning. Below, in the longitudinal direction of the unfolded state of FIG. 2, the portion of the notch 20c that is located on the ventral side of the central position CL is also referred to as a ventral cutout 20cf, and is located on the dorsal side of the central position CL. The part that does is also referred to as the dorsal notch 20cb.

In the diaper 1, the leg elastic members 33 such as rubber threads are arranged in a stretched state along the back side notch 20cb. The leg elastic members 33 are provided continuously in the longitudinal direction from the dorsal end of the dorsal notch 20cb to a predetermined position on the ventral side of the central position CL, straddling the central position CL. ing. In other words, the leg elastic member 33 is arranged along the portion 20cfp of the ventral cutout 20cf in the ventral area relative to the central position CL in the longitudinal direction.

On the other hand, in the longitudinal direction, the leg elastic member 33 along the ventral cutout 20cf is not arranged in a region on the ventral side of the portion 20cfp of the ventral cutout 20cf. The reason for this will be explained later.

<Regarding the function of the leg elastic member 33>
In the diaper 1 of the present embodiment, due to the configuration of the leg-surrounding elastic members 33 as described above, when the diaper 1 is worn, a space (feces storage space) for storing feces (poop) is formed in the back region. Excrement such as stool can be made less likely to leak on the side. 4A and 4B are diagrams illustrating formation of the feces accommodation space SP in the underpants-type diaper 1. FIG. FIG. 4A is a schematic side view showing a state before the stool accommodation space SP is formed, and FIG. 4B is a schematic side view showing a state where the stool accommodation space SP is formed.

When the wearer puts on the diaper 1, the absorbent main body 10 (absorbent core 11) fits along the crotch of the wearer as shown in FIG. 4A. In the state shown in FIG. 4A, no large gap is formed between the absorbent main body 10 and the wearer's body (skin), and the absorbent main body 10 is in a state in which the absorbent main body 10 is in close contact with the wearer's skin. Therefore, when urine is excreted on the front side (abdominal side), the absorbent core 11 can immediately absorb urine (liquid), and leakage of urine to the outside of the diaper 1 is suppressed. be.

On the other hand, when feces are excreted on the back side (dorsal side), feces (individuals) are hard to be absorbed by the absorbent core 11 , so that they are retained on the skin-side surface of the absorbent main body 10 . Here, when the absorbent main body 10 of the diaper 1 is in close contact with the wearer's body on the back side, there is a space between the wearer's skin and the absorbent main body 10 in which feces can be retained. Since it is not sufficiently formed, there is a risk that feces that could not be retained on the surface of the absorbent main body 10 may leak out of the diaper 1 .

On the other hand, in the diaper 1 of the present embodiment, the leg elastic members 33 arranged along the back portion of the leg openings LH exert a contractile force along the back cutouts 20cb. As a result, the absorbent main body 10 and the exterior body 20 are pulled from the ventral side to the dorsal side at the crotch portion as the leg elastic members 33 contract. As a result, the fabrics of the absorbent main body 10 and the outer body 20 are collected in the back region, and the fabric area on the back side increases, resulting in a state in which the fabric is left over the area of the wearer's buttocks. The surplus fabric on the back side is deformed so as to protrude toward the non-skin side, forming a stool storage space SP as shown in FIG. 4B. As a result, the diaper 1 is less likely to leak feces on the dorsal side.

Further, elastic members corresponding to the above-described leg elastic members 33 are not arranged on the ventral side of the leg openings LH of the diaper 1 (abdominal notch 20cf). That is, most of the region of the ventral cutout 20cf is not provided with an elastic member that exerts contractile force, so that no force acts to pull the absorbent main body 10 and the exterior body 20 from the dorsal side to the ventral side. . Therefore, the absorbent main body 10 and the exterior body 20 are easily pulled from the ventral side to the dorsal side by the leg-surrounding elastic members 33 along the dorsal cutout portion 20cb, and are less likely to be pulled from the dorsal side to the ventral side. As a result, the fabrics of the absorbent main body 10 and the like are more likely to be collected on the back side, and the structure is such that it is easier to form the feces accommodation space SP.

In addition, the leg elastic members 33 of the diaper 1 are continuously provided from the dorsal cutout portion 20cb to a portion 20cfp of the ventral cutout portion 20cf. That is, the leg-hole elastic member 33 exhibits stretchability in a range from the dorsal side edge portion 20es to a portion 20cfp of the ventral cutout portion 20cf along the dorsal cutout portion 20cb. Therefore, the part 20cfp of the ventral notch 20cf is easily pulled to the dorsal side, and the material of the ventral portion of the absorbent main body 10 and the exterior body 20 can be easily collected to the dorsal side to form the feces accommodation space SP. Cheap.

Note that even if the absorbent main body 10 is pulled to the back side by the leg-surrounding elastic members 33, the adhesiveness between the absorbent main body 10 and the wearer's skin on the ventral side is maintained, so urine leakage on the ventral side is prevented. Problems that are likely to occur are less likely to occur.

FIG. 5 is a schematic plan view illustrating a specific arrangement of the leg-hole elastic members 33. As shown in FIG. Similar to FIG. 2, FIG. 5 shows the diaper 1 in the unfolded and stretched state. As shown in FIG. 5, the leg elastic members 33 are arranged from the dorsal side to the ventral side in the longitudinal direction along the dorsal cutout portion 20cb, and are positioned at predetermined positions 33ef (ends on the ventral side in the longitudinal direction). are continuously arranged so as to cross the absorbent core 11 from one side to the other side in the width direction (left-right direction). Hereinafter, the portion of the leg-hole elastic member 33 that is arranged along the width direction between the predetermined positions 33ef, 33ef in the width direction will be referred to as a "central region R33ec". The state in which the leg elastic members 33 are arranged "along" the width direction also includes the state in which the leg elastic members 33 and the width direction are arranged at a predetermined angle. For example, when the leg elastic member 33 is arranged from one side to the other side in the width direction while being inclined at a predetermined angle (for example, an angle smaller than 45 degrees) with respect to the width direction, or in the central region R33ec This includes the case where the tilt angle is changed in . A portion of the leg-hole elastic member 33 that is curved along the notch 20c outside the center region R33ec in the width direction is referred to as a "curved region R33es".

In the manufacturing process of the diaper 1, the leg elastic members 33 are arranged in the transport direction with respect to the outer body 20 (a continuous body in which a plurality of outer bodies 20 are connected in the MD direction) transported in the width direction (MD direction). It is formed by arranging an elastic member such as a rubber thread while swinging it in the intersecting direction (CD direction). For example, with respect to the continuous body of the exterior body 20 conveyed in the MD direction, the rubber thread is paid out so as to move from one side to the other side in the CD direction, and is moved to a predetermined position in the CD direction (corresponding to the predetermined position 33ef described above). The movement in the CD direction is stopped while the rubber thread is reeled out, and the rubber thread is reeled out so as to move from the other side to the one side in the CD direction after a predetermined time elapses. As a result, a leg elastic member 33 having a shape as shown in FIG. 5 is formed.

In the leg elastic member 33 provided through the above steps, the contractile force developed in the central region R33ec is weaker than the contractile force developed in the curved region R33es. That is, in the diaper 1, the magnitude of the contractile force by the leg-hole elastic member 33 differs with respect to the predetermined positions 33ef, 33ef. This is because the degree of elongation of the rubber thread varies depending on whether the rubber thread is moved in the CD direction or not when the rubber thread is fed out in the above-described process.

Therefore, in the leg elastic member 33, the portion where the leg elastic member 33 and the absorbent core 11 overlap in the central region R33ec between the predetermined positions 33ef, 33ef acts on the absorbent core 11. The contractile force in the width direction of the leg elastic member 33 is reduced. Thereby, excessive contraction of the absorbent core 11 in the width direction (and the longitudinal direction) is suppressed. Therefore, the absorbent core 11 maintains a wide range in which excrement such as urine can be absorbed, and the absorbent performance of the diaper 1 can be improved.

In addition, the leg-hole elastic member 33 may be cut off in at least one or more places in the central region R33ec. In this case, since the shrinkage force along the width direction acting on the central region R33ec by the leg elastic members 33 becomes smaller, the shrinkage of the absorbent core 11 is more likely to be suppressed. Therefore, the absorbent performance of the diaper 1 can be improved.

On the other hand, in the curved region R33es outside the predetermined position 33ef in the width direction of the leg elastic member 33, the contractile force of the leg elastic member 33 acts along the dorsal notch 20cb without being weakened. there is Hereinafter, the curved region R33es where the contractile force of the leg elastic member 33 acts more strongly than the central region R33ec is also referred to as the “effective length” of the leg elastic member 33 . Further, of the effective length of the leg elastic member 33, the predetermined position 33ef located at the ventral end in the longitudinal direction is also referred to as the "ventral end 33ef". In the present embodiment, the ventral end 33ef is also the most ventral portion in the longitudinal direction of the curved portion of the leg elastic member 33 .

In this embodiment, the ventral end 33ef is located outside the absorbent core 11 in the width direction. That is, the effective length of the leg elastic members 33 does not overlap with the absorbent core 11 , and the contractile force of the leg elastic members 33 does not directly act on the absorbent core 11 . Since the absorbent core 11 is mostly made of SAP as described above, it has higher rigidity than other members (the top sheet 13, the back sheet 14, etc.). If the effective length of the leg-surrounding elastic member 33 overlaps with that of the absorbent core 11, the absorbent core 11 having high rigidity is less likely to shrink in the longitudinal direction, so the absorbent core 11 (absorbent main body 10) and the outer covering are not likely to contract. The fabric of the body 20 is less likely to gather on the dorsal side.

In contrast, in the present embodiment, the contractile force of the elastic members 33 around the legs acts on the regions on both sides of the absorbent core 11 in the left-right direction, and the top sheet 13 and the back sheet, which have relatively low rigidity in the absorbent body 10, are applied. 14 shrinks longitudinally. Therefore, as the top sheet 13 and the like shrink, the absorbent core 11 joined to the top sheet 13 and the like tends to be pulled toward the back side in the longitudinal direction, and the fabrics of the absorbent main body 10 and the exterior body 20 are pulled toward the back side. It becomes easier to gather at This facilitates the formation of the feces accommodation space SP.

Moreover, while the regions on both sides of the absorbent core 11 in the left-right direction contract in the longitudinal direction due to the leg elastic members 33, the absorbent core 11 itself is less likely to contract. That is, the widthwise (left and right) outer regions of the absorbent core 11 shrink to fit the wearer's leg loops, while the widthwise central portion of the absorbent core 11 does not shrink, and the width of the absorbent core 11 does not shrink. It is deformed so as to protrude to the non-skin side. That is, the absorptive core 11 is three-dimensionally deformed so as to protrude toward the non-skin side in the center region in the width direction. Therefore, in the feces storage space SP, the gap between the wearer's skin and the wearer's skin is large at the center in the width direction, and the gap between the wearer's skin and the wearer's skin is small at both sides in the width direction. As a result, it is possible to easily suppress side leakage of accommodated feces while providing a sufficiently large capacity of the feces accommodation space SP.

The outer body 20 of the diaper 1 has the narrowest width in the width direction at a predetermined position MN on the abdomen side of the central position CL in the longitudinal direction. That is, the cutout width of the ventral cutout portion 20cf is the largest at the predetermined position MN in the longitudinal direction. Since the width of the outer body 20 is narrowest on the abdomen side, the wearer can easily move the legs to the abdomen side (front side) when wearing the diaper 1 . For example, when the wearer is walking while wearing the diaper 1, or when the wearer is an infant or the like, it is less likely to interfere with the motion of extending the legs forward while lying on one's back. Hereinafter, this predetermined position MN will also be referred to as the "narrowest position MN".

In this embodiment, the ventral side end 33ef of the leg elastic member 33 is positioned further ventral than the narrowest position MN in the longitudinal direction. In this case, the range in which the contractile force of the leg-surrounding elastic member 33 acts is widened in the longitudinal direction, and the region of the exterior body 20 on the dorsal side of the narrowest position MN is pulled to the dorsal side as a whole. . That is, since the area of the cloth collected on the dorsal side is increased, the capacity of the formed feces storage space SP can be increased.

However, in the diaper 1, the ventral side end 33ef of the leg elastic member 33 may be located on the dorsal side of the narrowest position MN in the longitudinal direction. In this case, the range in which the contractile force of the leg elastic members 33 acts is narrowed in the longitudinal direction, and the portion of the ventral portion of the exterior body 20 that is pulled toward the dorsal side is reduced. Therefore, while the capacity of the stool storage space SP is smaller than in the case described above, the tightening along the leg openings LH on the back side (buttock side) is weaker, so that it is possible to soften the contact against the skin. . Therefore, it is effective as a diaper for infants and toddlers with sensitive skin.

Also, the leg elastic members 33 may be colored in a color different from that of the absorbent main body 10 and the exterior body 20 . In the diaper 1, the leg elastic members 33 are mainly arranged continuously along the dorsal cutout portion 20cb, and other elastic members are not arranged along the ventral cutout portion 20cf. Therefore, for example, if the leg elastic members 33 are colored in a conspicuous color such as red or blue, the leg elastic members 33 are visible on the dorsal side so as to border the leg openings LH. This makes it easier for the user to recognize the front and back of the diaper 1 . That is, since the colored leg elastic members 33 are arranged on the dorsal side (rear side) where the feces accommodation space SP is formed, the front and back of the diaper 1 can be easily grasped at a glance. It is possible to prevent the front and rear from being attached in the opposite direction.

In addition, since the absorbent core 11 of the diaper 1 contains 80% or more by weight of SAP, it is possible to reduce the thickness compared to an absorbent core made mainly of pulp or the like. Yes, and the rigidity can be lowered. Therefore, the absorbent core 11 of the present embodiment is easily three-dimensionally deformable, and the feces accommodation space SP can be three-dimensionally formed on the dorsal side. This makes it easier to hold (accommodate) the excreted stool in the stool storage space SP, thereby making it easier to suppress leakage of the stool to the outside.

Furthermore, the absorbent core 11 is formed in a substantially rectangular shape as shown in FIG. In other words, the absorbent core 11 is formed so that the length (width) in the width direction is constant within a predetermined range in the longitudinal direction. Therefore, compared to the case where the absorbent core has an elliptical shape or the like, the width of the stool storage space SP formed by the absorbent core 11 can be easily kept constant, and the volume of stool that can be held inside. can be increased. This makes it more difficult for feces to leak out.

Moreover, in the diaper 1, the absorbent main body 10 is arranged so as to deviate to the ventral side in the longitudinal direction. In other words, the absorbent main body 10 is arranged such that the central position of the absorbent main body 10 is located on the ventral side of the central position CL of the diaper 1 in the longitudinal direction. Since the absorbent main body 10 is arranged in advance toward the ventral side, the absorbent main body 10 does not run short of the area of the absorbent main body 10 on the ventral side when the absorbent main body 10 is pulled to the dorsal side. 10 fabrics can be collected on the back side to form a wide feces accommodation space SP. As a result, urine can be easily absorbed on the belly side of the diaper 1, and feces can be easily held (accommodated) on the back side.

In addition, the leg elastic member 33 has a contractile force for pulling the absorbent main body 10 and the exterior body 20 from the ventral side to the dorsal side to the extent that the feces accommodation space SP can be firmly formed on the dorsal side when the diaper 1 is worn. is arranged so that it can express Specifically, the leg elastic member 33 of the present embodiment is made of 1 to 3 rubber threads (three in the example of FIG. 5) of 10 to 4000 decitex (dtex), each of which is 2.0 to 3.5 times. are arranged at an extension magnification of . The term "elongation ratio" indicates the degree of elongation when the natural length of the elastic member (rubber thread) is 1. For example, when the elongation ratio is 1.2, the elastic member extends from its natural length to 0. .2 is extended.

If the expansion ratio of the elastic member 33 around the leg is less than 2.0 times, sufficient contractile force to pull the absorbent main body 10 toward the back cannot be obtained, and it is difficult to form the feces accommodation space SP firmly. Become. On the other hand, if the expansion ratio of the leg elastic members 33 is more than 3.5 times, the contractile force becomes too large, and the elastic members 33 tend to bite into the wearer's skin (buttocks) when the diaper 1 is worn. It tends to make the wearer feel uncomfortable. In this embodiment, by setting the expansion ratio of the elastic member 33 around the leg to 2.0 times to 3.5 times, the absorbent main body 10 is pulled from the ventral side to the dorsal side to firmly form the feces accommodation space SP. At the same time, it is possible to make it difficult for the wearer to feel uncomfortable when wearing the diaper 1 .

In addition, by providing a plurality of (three in FIG. 5) rubber threads as the leg elastic members 33, it is possible to prevent the leg elastic members 33 from being cut when the diaper 1 is put on, thereby preventing the leg openings from being cut. Appropriate stretchability can be expressed along the LH. In particular, when the leg openings LH are widened when the diaper 1 is put on and taken off, and when the diaper 1 is worn, the leg openings LH ( The thread rubber arranged along the back cutout portion 20cb) is easily cut. Therefore, by arranging a plurality of rubber threads, it is possible to prevent the leg elastic member 33 from being cut while providing sufficient contractile force.

Further, when a thread rubber having a gram number of 10 to 4000 decitex (dtex) per 10000 m is used as the leg elastic member 33, for example, commercially available Lycra (registered trademark) can be used. By using a commercially available rubber thread, the material cost can be reduced while firmly forming the stool storage space SP.

===Other Embodiments===
Although the embodiments of the present invention have been described above, the above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit and interpret the present invention. Further, the present invention can be modified and improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof. For example, the following modifications are possible.

The diaper 1 can be worn not only by adults but also by children such as infants (0 days old to less than 1 year old) and toddlers (1 year old to elementary school age). That is, the diaper 1 may be a diaper for children. In that case, as described in FIG. 5, by changing the position of the abdominal end 33ef of the leg elastic member 33 in the longitudinal direction, the contraction acting along the leg opening LH (dorsal notch 20cb) It is possible to adjust the magnitude of the force. As a result, the balance between the size of the feces storage space SP and the strength of tightening of the leg openings LH by the leg elastic members 33 is optimized for children, and the feces leakage can be suppressed while maintaining fit. Diapers can be provided.

1 diapers (underpants-type disposable diapers, absorbent articles),
10 absorbent body,
11 absorbent core, 12 core wrap sheet, 13 top sheet, 14 back sheet,
20 outer body,
20c notch,
20cf ventral cutout, 20cfp partial, 20cb dorsal cutout,
20es side edge portion,
21 skin side sheet, 21h oval notch,
22 non-skin side sheet, 22ff folded portion, 22bf folded portion,
31 ventral waist elastic member, 32 dorsal waist elastic member,
33 leg elastic member, 33ef ventral end (predetermined position),
35 leak-proof wall elastic member,
50 leak-proof wall,
BH waist opening, LH leg opening,
CL center position,
MN the narrowest position,
SP flight accommodation space,

Claims (13)

An absorbent article comprising an absorbent main body and an outer covering arranged to overlap in the thickness direction of the absorbent main body,
The exterior body has a cutout portion curved along the leg circumference of the wearer,
Having a longitudinal direction and a width direction that intersect each other in the unfolded state of the absorbent article,
The notch has a dorsal notch located on the dorsal side of the center and a ventral notch located on the ventral side of the center in the longitudinal direction,
The exterior body is
It has a leg elastic member continuously provided along a part of the dorsal cutout and the ventral cutout,
It does not have a leg-surrounding elastic member along the ventral notch on the ventral side in the longitudinal direction from the part,
The absorbent main body has an absorbent core, a topsheet, and a backsheet,
The leg elastic member has a central region that is a portion along the width direction at the central portion in the width direction, and a curved region that is a portion that is curved outside the central region in the width direction,
In the leg elastic member, the ventral end of the curved region in the longitudinal direction is positioned inside the side ends of the absorbent main body and outside the side ends of the absorbent core in the width direction. is located
The absorbent article , wherein the contractile force of the leg elastic members in the central region is smaller than the contractile force of the leg elastic members in the curved region. An absorbent article comprising an absorbent main body and an outer covering arranged to overlap in the thickness direction of the absorbent main body,
Having a longitudinal direction and a width direction that intersect each other in the unfolded state of the absorbent article,
Having a curved leg elastic member extending from the back waist to the crotch side,
It does not have a curved leg elastic member extending from the abdominal waist to the crotch side,
The leg elastic member straddles the central position in the longitudinal direction from the dorsal side to the ventral side,
The absorbent main body has an absorbent core, a topsheet, and a backsheet,
The leg elastic member has a central region that is a portion along the width direction at the central portion in the width direction, and a curved region that is a portion that is curved outside the central region in the width direction,
In the leg elastic member, the ventral end of the curved region in the longitudinal direction is positioned inside the side ends of the absorbent main body and outside the side ends of the absorbent core in the width direction. is located
The absorbent article , wherein the contractile force of the leg elastic members in the central region is smaller than the contractile force of the leg elastic members in the curved region. The absorbent article according to claim 1 or 2 ,
The absorbent article, wherein the leg elastic members are cut in at least one or more locations in the central region. The absorbent article according to any one of claims 1 to 3 ,
In the leg elastic member , the ventral end of the curved region in the longitudinal direction is
The absorbent article, wherein the absorbent article is located on the abdomen side of a position where the outer body has the narrowest width in the width direction in the longitudinal direction. The absorbent article according to any one of claims 1 to 3 ,
In the leg elastic member , the ventral end of the curved region in the longitudinal direction is
The absorbent article, wherein the absorbent article is located on the dorsal side in the longitudinal direction of a position where the outer body has the narrowest width in the width direction. The absorbent article according to any one of claims 1 to 5 ,
The absorbent article, wherein the leg elastic members are colored in a color different from that of the absorbent main body and the outer covering. The absorbent article according to any one of claims 1 to 6 ,
An absorbent article, wherein the absorbent core contains 80% or more of the superabsorbent polymer with respect to the total weight of the absorbent core. The absorbent article according to any one of claims 1 to 7 ,
An absorbent article, wherein the absorbent core has a constant width in the width direction within a predetermined range in the longitudinal direction. The absorbent article according to any one of claims 1 to 8 ,
in the longitudinal direction,
The absorbent article, wherein the central position of the absorbent main body is located on the ventral side of the central position of the exterior body. The absorbent article according to any one of claims 1 to 9 ,
The absorbent article, wherein the leg elastic members are provided at an extension ratio of 2.0 to 3.5 times. The absorbent article according to claim 10 ,
The absorbent article, wherein the weight of the leg elastic member per 10,000 m is 10 to 4,000 decitex. The absorbent article according to claim 10 or 11 ,
The absorbent article, wherein the leg elastic member is composed of one to three rubber threads. The absorbent article according to any one of claims 1 to 12 ,
An absorbent article characterized by being worn by infants or toddlers.

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