JP2023084087A - absorbent article - Google Patents

Abstract

To provide a technique which can suppress generation of a gap between the skin of a wearer and three-dimensional gatherings when an absorbent article has the three-dimensional gatherings extending in a longitudinal direction at the end parts in a width direction of a top sheet.SOLUTION: An absorbent article according to one aspect of the present invention includes an absorber having an absorbent core which can absorb a discharged liquid of a wearer and a water permeable sheet for covering the absorbent core, a top sheet having a water-permeable area provided on a skin surface side of the absorber, a water-impermeable side sheet provided on a skin surface side relative to the top sheet for forming three-dimensional gatherings, and a first stretchable member provided to be shrinkable in a longitudinal direction on the side sheet.SELECTED DRAWING: Figure 4

Description

The present invention relates to absorbent articles.

An absorbent article has been disclosed in which three-dimensional gathers extending in the longitudinal direction are provided at the ends of the top sheet in the width direction (for example, Patent Document 1). In the case of such an absorbent article, it is possible to prevent leakage of excretion (for example, urine, watery feces, etc.) on the top sheet to the outside.

JP 2018-068464 A

Even if the three-dimensional gathers are provided on the absorbent article, there is a possibility that a gap will occur between the wearer's skin and the three-dimensional gathers due to reasons such as the fact that the three-dimensional gathers and the wearer's skin do not come into surface contact. There is In such a case, it is conceivable that the discharge may leak through the gap.

In one aspect, the present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide an absorbent article having three-dimensional gathers extending in the longitudinal direction at the ends of the top sheet in the width direction. Another object is to provide a technique capable of suppressing the formation of a gap between the wearer's skin and the three-dimensional gathers.

In order to solve the above-mentioned problems, in the present invention, the crotch region of the absorbent core is provided with constrictions, and the three-dimensional gathers and the top sheet are formed near the outer ends in the width direction of the wide portions of the front body region and the back body region of the absorbent core. A connecting portion to be connected is provided, and a first elastic member is provided along the free end of the three-dimensional gather.

Specifically, the absorbent article according to the present invention is an absorbent article having a length along a longitudinal direction and a length along a width direction perpendicular to the longitudinal direction, and absorbs the wearer's discharged liquid. and a water-permeable sheet covering the absorbent core, a top sheet having a water-permeable region provided on the skin side of the absorbent body, and a side sheet for forming a three-dimensional gather. a water-impermeable side sheet provided closer to the skin than the top sheet; and a first stretchable member provided on the side sheet so as to be stretchable in the longitudinal direction; It has a constricted shape in the width direction at the central portion in the longitudinal direction, and is sandwiched between the narrowest portion in the crotch region, the wide portions in the front body region and the back body region, and the narrowest portion and the wide portion. The width of the water-permeable sheet having a widened portion and covering the absorbent core is substantially the same as the width of the widened portion and substantially constant in the longitudinal direction, and is wider than the narrowest portion in the widthwise direction. The outer top sheet is provided so as to be able to stand on the skin surface side along a line extending in the longitudinal direction passing through the widthwise end of the narrowest portion, and is provided at the widthwise outer end of the wide portion. The top sheet and the side sheet are connected in the vicinity of each other, and a connecting portion including a standing line when the three-dimensional gathers are erected is provided. A free end provided along the longitudinal direction at the end on the skin side opposite to the end, and a folding line provided between the base end and the free end and extending in the longitudinal direction. and, the free end exists in the vicinity of the standing line when the side sheets in a superimposed state are viewed from above, and the first elastic member is provided along the free end. The three-dimensional gathers stand up on the skin surface side of the top sheet as the standing lines and extend inwardly of the standing lines in the width direction.

In the absorbent article described above, the absorbent core may have a bending portion that facilitates bending of the widthwise end portion toward the skin surface with respect to the widthwise central portion.

In the above absorbent article, the absorbent core has a high-rigidity portion on the center side in the width direction and a low-rigidity portion on the end side in the width direction at least at the ends in the longitudinal direction, A bent portion may be formed between the high-rigidity portion and the low-rigidity portion, and the longitudinal ends of the three-dimensional gathers may be laminated on the top sheet in a region overlapping the low-rigidity portion. .

In the absorbent article, the standing line may be provided inside the widthwise end of the absorbent body.

In the above absorbent article, the free ends may be provided on the side sheets in a superimposed state so as to be located at a position overlapping the standing line or in the vicinity of the standing line with the three-dimensional gathers formed. good.

The absorbent article further comprises a non-water-permeable back sheet covering the non-skin surface side of the absorbent body, wherein the back sheet is positioned within the widthwise outer region relative to the widened portion and further than the widened portion. It may be provided to overlap the topsheet in the longitudinal inner region.

In the absorbent article, the free end may be provided inside the widthwise end of the absorbent body in a state where the three-dimensional gathers stand on the skin surface side.

The absorbent article is arranged on the non-skin surface side of the absorbent body, and has a waist opening through which the wearer's abdominal circumference can be inserted, and two leg openings through which the wearer's legs can be inserted. and an exterior sheet to be formed, which is provided on the wearer's ventral side along one of the leg openings and crosses the crotch portion, extends along the other leg opening, and is in a stretched state. A second stretchable member provided on the outer sheet and a third stretchable member provided on the outer sheet in a stretched state on the back side of the wearer, and when viewed in the thickness direction, the and a third stretchable member arranged at a portion where an inner end portion in the width direction overlaps with the absorber.

The absorbent article may include a bonding portion that bonds the absorbent body and the exterior sheet, and the bonding portion may not be provided in a region where the second stretchable member crosses the absorbent body.

In the absorbent article, a plurality of the adhesive portions are provided, each of the plurality of adhesive portions extends in the width direction and is provided apart from each other in the longitudinal direction, and the adhesive portions include the absorbent article. It may be formed to have the same width as the narrowest portion of the core.

According to the present invention, when the absorbent article has the three-dimensional gathers extending in the longitudinal direction at the ends of the top sheet in the width direction, it is possible to suppress the formation of gaps between the wearer's skin and the three-dimensional gathers. is.

FIG. 1 is an example of a perspective view of a diaper according to an embodiment. FIG. 2 is an example of an exploded perspective view of the diaper according to the embodiment. FIG. 3 is an example of a developed view of the diaper according to the embodiment. FIG. 4 : is an example of a schematic diagram of the cross-sectional structure of the diaper which concerns on embodiment. FIG. 5 is an example of a schematic plan view of the diaper according to the embodiment. FIG. 6 is an example of a cross-sectional view including a top sheet and side sheets. FIG. 7 is an example of a developed view of the diaper according to the embodiment. FIG. 8 : is an example of a schematic diagram of the cross-sectional structure of the diaper which concerns on embodiment. FIG. 9 is an example of a schematic plan view of a diaper according to Modification 1. FIG. FIG. 10 is an example of a schematic plan view of a diaper according to Modification 2. FIG. FIG. 11 is an example of a schematic cross-sectional view of a diaper according to Modification 3. As shown in FIG.

<Embodiment>
A diaper according to an embodiment of the present invention will be described below with reference to the drawings. The configurations of the following embodiments are examples, and the present invention is not limited to the configurations of these embodiments.

FIG. 1 is a perspective view of an adult underpants-type disposable diaper (hereinafter simply referred to as "diaper") according to the embodiment. In the diaper, the longitudinal direction is the direction connecting the front body arranged to face the abdomen of the wearer and the back body arranged to face the back of the wearer. Between the front body (one side in the longitudinal direction) and the back body (the other side in the longitudinal direction) (center in the longitudinal direction), there is an inseam that is placed in the wearer's crotch (placed facing the crotch) department is located. In addition, when the diaper is worn by the wearer, the side facing the wearer's skin is the skin side, and the side opposite to the skin side is the non-skin side. Furthermore, the direction connecting the skin surface side and the non-skin surface side is defined as the thickness direction, and the direction orthogonal to both the longitudinal direction and the thickness direction is defined as the width direction. In addition, viewing from the thickness direction is defined as planar view. The diaper 1 has a length along the longitudinal direction and a lateral width along the width direction orthogonal to the longitudinal direction, and is worn around the wearer's crotch. In addition, the terms used in the present application regarding directions mean directions corresponding to the front, back, left, and right of the wearer when the diaper 1 is worn by the wearer. For example, in the present application, the lateral direction means a direction corresponding to the lateral direction of the wearer when the diaper 1 is worn by the wearer.

In the present embodiment, as an example of an absorbent article, a pants-type disposable diaper having a cylindrical structure having an opening for receiving the wearer's abdominal circumference and a pair of left and right openings through which the wearer's left lower leg and right lower leg are inserted. However, the "absorbent article" in the present application is not limited to pants-type disposable diapers for adults. As used herein, "absorbent articles" include pants-type disposable diapers for children. In addition, a tape fixed near one end of a sheet-shaped member that covers the wearer's crotch (genitals) from the front body to the back body is attached near the other end of the sheet-shaped member to form a cylindrical structure. Included are various forms of absorbent articles that can wrap around the waist and crotch, such as tape-type disposable diapers that form a .

The diaper 1 has a crotch region 1B that corresponds to the crotch region that covers the wearer's pubic region (crotch) when worn, and a region that corresponds to the front body around the waist of the wearer and is the abdomen side of the wearer. It has a front body region 1F for covering and a back body region 1R for covering the wearer's back side, which is a part corresponding to the back body around the waist of the wearer. Here, the front body region 1F is located on the front side of the crotch region 1B, and the back body region 1R is located on the rear side of the crotch region 1B. Since the diaper 1 in this embodiment is a pants-type disposable diaper, the left edge of the front body region 1F and the left edge of the back body region 1R are joined together, and the right edge of the front body region 1F and the back body are joined together. The right edges of region 1R are joined together. Therefore, in the diaper 1, a waist opening 2T (an example of the "waist opening" referred to in the present application) is formed by the upper edge of the front body region 1F and the upper edge of the back body region 1R. In the diaper 1, a left leg opening 2L is formed on the left side of the crotch region 1B, which is not joined, and a right lower leg opening 2R is formed on the right side of the crotch region 1B. The diaper 1 is arranged such that the wearer's left lower leg is inserted through the left lower leg opening 2L, the wearer's right lower leg is inserted through the right lower leg opening 2R, and the wearer's torso is inserted into the torso opening 2T. When worn, the front body region 1F is arranged on the abdomen side of the wearer, the back body region 1R is arranged on the back side of the wearer, and the left lower leg opening 2L and the right lower leg opening 2R are arranged on the wearer's thighs. It is fixed to the wearer's body in a state surrounding the part. Since the diaper 1 is fixed to the wearer's body in this manner, the wearer can move freely while wearing the diaper 1 .

In the diaper 1, an absorbent body capable of absorbing and retaining liquid is mainly arranged around the crotch region 1B. In addition, the diaper 1 has a left lower leg opening surrounding the thigh of the wearer's left lower leg in order to suppress formation of a gap serving as an outflow path for liquid between the diaper 1 and the wearer's skin. Three-dimensional gathers 3BL are provided in 2L, three-dimensional gathers 3BR are provided in the lower right leg opening 2R surrounding the thigh of the wearer's right leg, and waist gathers 3R are provided in the region surrounding the waist circumference of the wearer. In addition, leg gathers 3LL and 3LR are provided at positions surrounding the roots of the wearer's legs. The three-dimensional gathers 3BL, 3BR and the waist gathers 3R are in close contact with the wearer's skin due to the elastic force of the thread rubber. Also, the leg gathers 3LL and 3LR prevent a gap from being created between the groin of the wearer's leg and the diaper 1.例文帳に追加Therefore, the excrement discharged from the wearer's pubic region is absorbed by the absorber of the diaper 1 without hardly leaking out of the diaper 1 .

The diaper 1 can be used in combination with an inner pad (not shown). The inner pad is a generally rectangular absorbent article with an absorbent body to absorb exuded liquids. When the diaper 1 and the inner pad are used in combination, the inner pad is placed on the skin surface side of the diaper 1 so as to be in contact with the discharge holes of the wearer. The discharged liquid is first absorbed by the inner pad, and only the discharged liquid that could not be absorbed by the inner pad reaches the absorber of the diaper 1 and is further absorbed. Therefore, even when the amount of discharged liquid is large, leakage of the discharged liquid from the diaper 1 can be prevented. In addition, when the amount of discharged liquid is small and can be completely absorbed by the inner pad, only the inner pad needs to be replaced even if the discharged liquid is generated, which reduces the assistance cost. Moreover, the diaper 1 can be used for a long time.

FIG. 2 is an exploded perspective view of the diaper 1 according to the embodiment. A diaper 1 has a cover sheet 4 and an inner cover sheet 5 . The cover sheet 4 and the inner cover sheet 5 are substantially hourglass-shaped (gourd-shaped) sheets that are bonded together to form the outer surface of the diaper 1, and have an end on the front body region 1F side and an end on the back body region 1R side. Other than that, they have the same shape. When worn by the wearer, the cover sheet 4 is laminated on the non-skin side of the wearer, and the inner cover sheet 5 is laminated on the skin side. Thread rubbers are provided between the cover sheet 4 and the inner cover sheet 5 to form the waist gathers 3R and the leg gathers 3LL and 3LR. It should be noted that a stretchable member such as belt-like rubber can be appropriately selected instead of the thread rubber.

The cover sheet 4 and the inner cover sheet 5 can be made of, for example, a non-woven fabric made of a liquid-impermeable thermoplastic resin, in order to suppress leakage of discharged matter. Examples of liquid-impermeable thermoplastic resins include polyethylene (PE) and polypropylene (PP).

The diaper 1 has a back sheet 6, an absorbent body 8, and a top sheet 9 which are laminated in order on the wearer-side surfaces of the cover sheet 4 and the inner cover sheet 5. As shown in FIG. The back sheet 6 is a substantially rectangular parallelepiped sheet having a length in the longitudinal direction reaching from the wearer's front body to the back body via the crotch and a predetermined width in the width direction orthogonal to the longitudinal direction. . Both the absorbent body 8 and the top sheet 9 are sheet-like members having a substantially rectangular appearance like the back sheet 6 . are stacked in order. The back sheet 6 is a sheet made of a liquid-impermeable thermoplastic resin in order to suppress leakage of discharged matter. Moreover, the top sheet 9 is a sheet-like member arranged on the wearer's skin surface side so as to cover the absorbent surface of the absorbent body 8 . This top sheet 9 has liquid permeability in part or in its entirety. Therefore, in the state in which the diaper 1 is worn, the liquid discharged from the wearer passes through the topsheet 9, which may come into contact with the wearer's skin, and enters the absorbent body 8, where it is absorbed. Examples of liquid-permeable sheets include woven fabrics, non-woven fabrics, and porous films. Moreover, the top sheet 9 may have hydrophilicity.

The absorbent body 8 has an absorbent core 8c made of a mat and a core wrap sheet 7 wrapping the absorbent core 8c. The absorbent core 8c has a substantially hourglass shape with a constricted portion. The absorbent core 8c contains short fibers of cellulose fibers such as pulp fibers, rayon fibers, or cotton fibers, or short fibers obtained by hydrophilizing synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate. It has a structure in which a granular absorbent resin (polymeric absorbent) such as SAP (Super Absorbent Polymer), which is a hydrophilic polymer having a crosslinked structure capable of absorbing and holding the , is held. When the absorbent core 8c absorbs the liquid discharged from the wearer, it swells the absorbent resin held in the gaps in the short fibers and holds the liquid in the short fibers. In this embodiment, the absorbent core 8c has a substantially hourglass shape with a constricted portion near the center. The absorbent core 8c can have an appropriate shape according to the purpose. Examples of the shape of the absorbent core 8c include a rectangular shape, an elliptical shape, and various other shapes.

The core wrap sheet 7 is a thin liquid-permeable sheet, and by wrapping the absorbent core 8c with the core wrap sheet 7, the SAP of the absorbent core 8c described above is less likely to mix with other structures. The core wrap sheet 7 covering the absorbent core 8c has a rectangular parallelepiped shape with an inner width substantially the same as the widths of the front body region 1F and the rear body region 1R of the absorbent core 8c. That is, in the crotch region 1B where the absorbent core 8c is constricted, there is a space between the widthwise end of the absorbent core 8c and the widthwise inner surface of the core wrap sheet 7 . Further, by wrapping the absorbent core 8c with the core wrap sheet 7, the shape of the absorbent core 8c is suppressed. The core wrap sheet 7 can be made of pulp fibers, and tissue paper can be used as an example. Although the core wrap sheet 7 may be a single sheet, it consists of an upper sheet arranged on the wearer's skin side and a lower sheet arranged on the wearer's non-skin side and wrapping around the sides and the skin side of the absorbent core. It may be composed of two sheets of side sheets. When the core wrap sheet 7 is composed of two sheets, the width direction end of the upper sheet is wrapped by other sheets (for example, the side sheets 10L and 10R, the back sheet 6, and the top sheet 9, which will be described later). can be Note that the absorbent body 8 is wrapped by the back sheet 6 and the top sheet 9, and these sheets can also prevent the absorbent body from losing its shape, so the core wrap sheet 7 can be omitted.

The backsheet 6, absorbent body 8, and topsheet 9 all extend from the front body region 1F to the back body region 1R. Therefore, when the back sheet 6, the absorbent body 8, and the top sheet 9 are laminated to cover the pubic region (crotch) of the wearer, both longitudinal ends of the back sheet 6, the absorbent body 8, and the top sheet 9 can be It is positioned on the ventral and dorsal sides of the In other words, the wearer's pubic region is covered with the absorber 8 from the wearer's ventral side to the dorsal side. Therefore, regardless of whether the wearer discharges the liquid to the outside of the body with the stomach facing downward or the posture with the back facing downward, the discharged liquid comes into contact with the absorbent body 8 via the top sheet 9 . will do.

The diaper 1 also has elongated band-like side sheets 10L and 10R for forming the three-dimensional gathers 3BL and 3BR described above. The side sheets 10L and 10R are long side portions of the top sheet 9, and are provided so that the inner side in the width direction overlaps with the absorbent core 8c. Then, rubber threads 10L1 and 10R1 (an example of the "first elastic member" of the present disclosure) are adhered to the side sheets 10L and 10R while being stretched along the longitudinal direction. Therefore, the edge 4F4 of the cover sheet 4, which is the left edge of the front body region 1F, and the edge 4R4, which is the left edge of the back body region 1R, are joined together, and the cover sheet 4 is joined to the front body region 1F. When the diaper 1 in the completed state as shown in FIG. The 10R is drawn in the longitudinal direction by the contractile force of the rubber threads 10L1 and 10R1, and is connected to the pair of folding lines 10L2 and 10R2 ("upright lines" in the present application) that are connected to the top sheet 9 provided on the skin surface side. (Example)), stand up from the top sheet 9. As a result, three-dimensional gathers 3BL and 3BR are formed to prevent liquid from flowing out from the left lower leg opening 2L and the right lower leg opening 2R (an example of the "leg opening" in the present application) (details will be described later). Although the method of joining the edges 4F4 and 4R4 and the edges 4F5 and 4R5 is not particularly limited, for example, heat sealing, high-frequency sealing, ultrasonic sealing, or the like can be used.

Furthermore, the diaper 1 further includes an end sheet 11F laminated on the wearer-side surface of the front body region 1F of the cover sheet 4 with the back sheet 6, the absorbent body 8, the top sheet 9, and the side sheets 10L and 10R interposed therebetween; and an end sheet 11R laminated on the wearer-side surface of the back body region 1R of the cover sheet 4. As shown in FIG. The end sheets 11</b>F and 11</b>R are strip-shaped sheets that are overlapped with the cover sheet 4 and the inner cover sheet 5 at one end side of the top sheet 9 in the longitudinal direction. The end sheets 11F and 11R are made of water-impermeable non-woven fabric, and mainly reinforce the cover sheet 4 and the inner cover sheet 5 at the waist contact portion of the diaper 1 . Adhesive is applied to each of the end sheets 11F and 11R, and the end sheets 11F and 11R are adhered to the inner cover sheet 5 by the adhesive. The end sheets 11F and 11R are arranged closer to the skin than the laminate formed by the back sheet 6, the absorbent body 8, the top sheet 9 and the side sheets 10L and 10R, and the edges of the laminate are in direct contact with the skin when worn. prevent people from feeling uncomfortable.

FIG. 3 is a diagram schematically showing the state in which the diaper 1 according to the embodiment is unfolded and stretched. FIG. 3(A) schematically shows the internal structure of the diaper 1 in the unfolded and stretched state when viewed from the left side. FIG. 3(B) schematically shows a plan view of the diaper 1 in an unfolded and stretched state. Note that the side seats 10L and 10R and the end seats 11F and 11R are not shown in FIG. 3(B).

In the following description, the widest portion of the absorbent core 8c in which the crotch region 1B is constricted in the width direction is called the widest portion 88A, and the narrowest portion is called the narrowest portion 88B. A widened portion 88C is a portion that is sandwiched between the wide portion 88A and the narrowest portion 88B and that gradually widens from the crotch region 1B to the front body region 1F. The portions of the top sheet 9 located between the widthwise ends of the narrowest portion 88B and the widened portion 88C and the widthwise ends of the core wrap sheet 7 are side flaps 41L and 41R. A back sheet 6 is layered on the non-skin surface side of the side flaps 41L and 41R to increase rigidity. With such a structure, when the rubber threads 10L1 and 10R1 contract, the side flaps 41L and 41R can be easily raised toward the skin surface (details will be described later).

One end side of the cover sheet 4 is folded at folding lines 4FF and 4RF shown in FIG. The waist gathers 3R described above are adhered to the front body region of the cover sheet 4 with rubber threads (rubber threads) 4F1 and 4F2 in a stretched state, and to the rear body region of the cover sheet 4 are rubber threads (rubber threads) 4R1. , 4R2 are glued together in an elongated state. The rubber threads 4F1 and 4F2 are provided in this order from the side of the folding line 4FF along the folding line 4FF that forms the upper edge of the front body region 1F when folded back. Similarly to the rubber threads 4F1 and 4F2, the rubber threads 4R1 and 4R2 are also stretched from the side of the folding line 4RF along the folding line 4RF that forms the upper edge of the back body region 1R when folded back. are provided in the order of

Therefore, the rubber threads 4F1 and 4F2 are provided on the cover sheet 4 in such a direction that the longitudinal direction, which is the stretching direction, is the left-right direction of the diaper 1 . Also, the rubber threads 4R1 and 4R2 are provided on the cover sheet 4 in such a direction that the longitudinal direction, which is the stretching direction, is the left-right direction of the diaper 1. As shown in FIG. Therefore, when the edge 4F4 and the edge 4R4 are joined to each other, and the edge 4F5 and the edge 4R5 are joined to each other, the rubber threads 4F1 and 4F2 and the rubber threads 4R1 and 4R2 are formed substantially in an annular shape around the trunk opening 2T. , and exerts the function of contracting the waist opening 2T in the waist circumference direction. That is, the rubber threads 4F1, 4F2 and the rubber threads 4R1, 4R2 exert a contractile force to bring the diaper 1 into close contact with the wearer, thereby preventing formation of a gap between the diaper 1 and the wearer's waist circumference. A portion of the plurality of rubber threads 4F2 and 4R2 on the side of the crotch region 1B overlaps the absorbent core 8c.

The thread rubbers 4F1 and 4R1 are provided so as to extend in the left-right direction along the upper edges of the front body region 1F and the back body region 1R shown in FIG. The thread rubbers 4F2 and 4R2 are provided in parallel with a predetermined interval. When the diaper 1 is worn, the rubber threads 4F1 and 4R1 tighten the waist circumference of the wearer above the rubber threads 4F2 and 4R2 relatively strongly. The thread rubbers 4F1 and 4R1 have the function of keeping the diaper 1 in close contact with the wearer to prevent the wearer from slipping out of position and preventing discharge from leaking from the abdomen and back. The rubber threads 4F2 and 4R2 relieve the wearer's feeling of pressure caused by the contractile force of the rubber threads 4F1 and 4R1. Moreover, the thread rubbers 4F2 and 4R2 suppress displacement of the inner pad when the inner pad is used.

Furthermore, a rubber thread 4F3 (an example of a “second stretchable member” of the present disclosure) and a rubber thread 4R3 (an example of a “third stretchable member” of the present disclosure) are adhered to the cover sheet 4 in a stretched state. be. The rubber thread 4F3 and the rubber thread 4R3 are elastic members provided in the region of the cover sheet 4 closer to the crotch region 1B than the rubber thread 4F2 and 4R2. The rubber threads 4F3 and 4R3 are different from the other rubber threads that are adhered from the left end to the right end of the cover sheet 4 without interruption, and are curved toward the crotch region 1B, forming an hourglass-shaped widened portion of the absorbent core 8c. At 88C, it overlaps the absorbent core 8c. By configuring in this way, the arrangement regions of the rubber threads 4F3 and 4R3 can function as the leg gathers 3LL and 3LR. The rubber thread 4F3 provided in the front body region (abdominal side) crosses the absorber 8 when viewed in the thickness direction. Here, in the region where the rubber thread 4F3 crosses the widthwise central portion of the diaper 1, the cover sheet 4 and the absorbent body 8 are not adhered. Non-adhesive. Therefore, the cover sheet 4 can lift the absorbent body 8 toward the skin surface without shrinking the absorbent body 8 due to contraction of the rubber thread 4F3. With this configuration, in the diaper 1, the absorber 8 is lifted toward the wearer's abdomen, and the free ends of the three-dimensional gathers 3BL and 3BR are brought into contact with appropriate positions on the wearer's skin on the wearer's abdomen. easier.

The rubber thread 4F3 provided in the front body region (abdominal side) crosses the absorber 8 when viewed in the thickness direction. Here, in the region where the rubber thread 4F3 crosses the widthwise central portion of the diaper 1, the cover sheet 4 and the absorbent body 8 are not adhered. Non-adhesive. Therefore, the cover sheet 4 can lift the absorbent body 8 toward the skin surface without shrinking the absorbent body 8 due to contraction of the rubber thread 4F3. With this configuration, in the diaper 1, the absorber 8 is lifted toward the wearer's abdomen, and the free ends of the three-dimensional gathers 3BL and 3BR are brought into contact with appropriate positions on the wearer's skin on the wearer's abdomen. easier.

The rubber thread 4R3 overlaps the absorbent core 8c at the widened portion 88C along the constriction of the cover sheet 4. As shown in FIG. The thread rubbers 4F3 and 4R3 overlap part of the absorbent body 8 and the side flaps 41L and 41R of the top sheet 9 on the widthwise outer side of the widened portion 88C. By contracting the rubber threads 4F3 and 4R3 in the direction in which they themselves extend, the portion of the cover sheet 4 to which the rubber threads 4F3 and 4R3 are attached becomes pleated, and the diaper 1 is brought into close contact with the wearer's crotch. It functions as leg gathers 3LL and 3LR.

The cover sheet 4 is folded back along folding lines 4FF and 4RF to extend to the area where the rubber thread 4F1 and the rubber thread 4R1 are arranged, and the folded portion reinforces the area where the rubber thread 4F1 and the rubber thread 4R1 are arranged. . The end sheets 11F and 11R are provided in areas where the rubber threads 4F2 and 4R2 are arranged where the cover sheet 4 folded back at the folding lines 4FF and 4RF does not extend, and reinforces the areas where the rubber threads 4F2 and 4R2 are arranged. ing.

In the present application, the state in which the sheets are overlapped is not limited to the state in which the sheets are entirely in contact with each other, but includes the concept in which the sheets partially overlap each other. For example, the end sheet 11</b>F is overlapped in such a manner that a portion of the back sheet 6 on one end side in the longitudinal direction touches a portion of the cover sheet 4 . Since the diaper 1 is formed by stacking the back sheet 6 and the top sheet 9 with the absorbent body 8 sandwiched therebetween, the cover sheet 4, the end sheets 11F and 11R, the inner cover sheet 5, and the side sheets 10L and 10R are stacked. , it can be said to have a laminate in which a plurality of these sheets are stacked.

FIG. 4 is a diagram schematically showing the cross-sectional structure of the diaper according to the embodiment. The absorbent body 8 includes a core wrap sheet 7 and an absorbent core 8 c wrapped in the core wrap sheet 7 . The absorbent core 8c extends to near the widthwise end of the absorbent body 8 in the vicinity of the longitudinal end.

Since the crotch region 1B is sandwiched between the wearer's legs, a compressive pressure is applied to the inner side in the width direction. On the other hand, in the front body region 1F and the back body region 1R, pressure is applied in the thickness direction of the absorbent core 8c due to the weight of the wearer. Therefore, by providing a constriction in the crotch region of the absorbent core 8c, the absorbent core 8c in the crotch region is made to have a higher basis weight, thereby preventing the shape from collapsing inward in the width direction. In addition, in the front body region and the back body region, the width of the absorbent core is increased to increase the area on which weight is applied, thereby preventing deformation in the thickness direction. For this reason, it is preferable to make the absorbent core 8c into an hourglass shape.

In this figure, the absorbent core 8c is wrapped in a water-permeable core wrap sheet 7. As shown in FIG. Furthermore, the core wrap sheet 7 is divided into an upper layer core wrap sheet 7f positioned on the wearer's skin side when worn and a lower layer core wrap sheet 7b positioned on the wearer's non-skin side when worn. The upper layer core wrap sheet 7f and the lower layer core wrap sheet 7b are adhered to each other at the skin side end portion of the absorbent core 8c. The upper core wrap sheet 7f is adhered to the skin side of the absorbent core 8c with a hot-melt adhesive HM. The lower layer core wrap sheet 7b is adhered to the absorbent core 8c with a hot melt adhesive HM.

The back sheet 6 is a water-impermeable film laminated on the non-skin surface side of the absorbent body 8, and prevents the discharged liquid permeating the absorbent body 8 from leaking to the cover sheet 4 side. The back sheet 6 is wider than the absorbent core 8c, wraps around the side surfaces of the absorbent core 8c, and reaches the skin side.

The top sheet 9 is a water-permeable sheet that contacts the wearer's skin surface. When exuded liquid is discharged from the wearer, the exuded liquid passes through the top sheet 9 and permeates the absorbent core 8c to be absorbed. The top sheet 9 is also wider than the absorbent core 8c, wraps around the sides of the absorbent core 8c, and reaches the non-skin surface side. On the skin side of the absorbent body 8 , the top sheet 9 is laminated closer to the skin side than the back sheet 6 .

The side sheets 10L and 10R are water-impermeable nonwoven fabric sheets arranged on both sides of the absorbent body 8 in the width direction, and form a pair of side sheets covering the side surfaces of the absorbent body 8 in the width direction. The side sheets 10L, 10R further rise toward the skin surface at the skin surface side end portions of the absorbent body 8 to form three-dimensional gathers 3BL, 3BR for preventing side leakage of discharged liquid. On the skin surface side of the absorbent body 8, the side sheets 10L and 10R are laminated closer to the skin surface than the top sheet 9 is.

Further, the back sheet 6 has a folded portion 6</b>A that is folded back toward the skin surface side at the end portion in the width direction of the absorbent body 8 and extends toward the skin surface side of the absorbent body 8 . The backsheet 6 is folded back on the skin surface side of the absorbent body 8 so that the folded portions 6A cover the widthwise end portions of the absorbent body 8 . A hot-melt adhesive is applied between the folded portion 6A and the top sheet 9 so as to extend along the longitudinal direction of the diaper 1 . The folded portion 6A and the top sheet 9 are adhered by applying this hot-melt adhesive.

The side sheets 10L, 10R for forming the three-dimensional gathers 3BR, 3BL are arranged outside the center of the diaper 1 in the width direction, and are arranged closer to the skin than the top sheet 9 is. A hot-melt adhesive is applied between the top sheet 9 and the side sheets 10L, 10R so as to extend along the longitudinal direction of the diaper 1. As shown in FIG. The top sheet 9 and the side sheets 10L and 10R are adhered by applying this hot-melt adhesive. Non-water-permeable portions 30L and 30R are formed by a hot-melt adhesive having water-impermeability. The impermeable portions 30L and 30R are formed from the non-skin surface side of the side sheets 10L and 10R to the skin surface side of the folded portion 6A of the back sheet 6 via the top sheet 9 when viewed in the thickness direction. The water impermeable portions 30L, 30R suppress the leakage of the discharged liquid that has permeated the top sheet 9 from the width direction end portions of the absorbent body 8 along the folded portions 6A of the back sheet 6, and the side sheets 10L, 10R and the top sheet. Suppresses the discharge liquid from entering between 9. As a result, the impermeable portions 30L and 30R prevent the liquid from leaking from the widthwise end portions of the diaper 1 . The impermeable portions 30L, 30R are formed from the front body region to the back body region so as to extend in the longitudinal direction of the diaper 1. As shown in FIG. As a result, the diaper 1 can suppress lateral leakage from any position of the width direction end.

Moreover, the side sheets 10L and 10R cover the widthwise end portions of the top sheet 9 and the back sheet 6 . As a result, the diaper 1 can suppress lateral leakage even if the liquid permeates to the widthwise end side of the impermeable portions 30L and 30R.

Further, the impermeable portions 30L and 30R are integrally formed when viewed in the thickness direction. The hot melt adhesive is applied from the skin side of the top sheet 9, penetrates the top sheet 9, and hardens between the top sheet 9 and the folded portion 6A of the back sheet 6; This is because the water impermeable portions 30L, 30R are formed by the hardened hot-melt adhesive between the top sheet 9 and the side sheets 10L, 10R. In the diaper 1, discharged liquid does not permeate the top sheet 9 and reach the non-skin side, and leakage of the liquid from the non-skin side can be suppressed.

Further, the three-dimensional gathers 3BL and 3BR stand up on the skin surface side with folding lines 10L2 and 10R2 formed at positions overlapping the top sheet 9 as boundaries. The folding lines 10L2 and 10R2 are formed on the inner side in the width direction of the diaper 1 from the impermeable portions 30L and 30R along the width direction inner end portions of the impermeable portions 30L and 30R. In other words, the impermeable portions 30L and 30R are provided outside the folding lines 10L2 and 10R2 in the width direction of the diaper 1 . Since the impermeable portions 30L and 30R are made of hot-melt adhesive, the regions where the impermeable portions are formed are harder than when the impermeable portions are not provided. In the diaper 1 according to the present embodiment, the side sheets 10L and 10R are arranged closer to the skin surface than the impermeable portions 30L and 30R. , it is possible to prevent the impermeable part from touching the skin surface and giving the wearer a sense of discomfort.

In addition, the fold lines 10L2 and 10R2, which are the inner ends in the width direction of the non-permeable portions 30L and 30R, are positioned inwards in the width direction from the ends in the width direction of the absorber 8, for example, by about 3 mm to 5 mm. be forced. That is, the widthwise outer end portions of the absorbent body 8 are located on the widthwise outer side of the diaper 1 with respect to the folding lines 10L2 and 10R2. Therefore, in the diaper 1 according to the present embodiment, the widthwise outer end of the absorbent body 8 does not directly touch the wearer's skin surface, and the widthwise outer end of the absorbent body 8 touches the skin surface. It is possible to prevent the wearer from feeling uncomfortable. Further, when the side sheets 10L, 10R stand up at the folding lines 10L2, 10R2, the impermeable portions 30L, 30R located outside the folding lines 10L2, 10R2 in the width direction function as high-rigidity portions that reinforce the standing lines. obtain.

4, the three-dimensional gathers 3BL and 3BR extend inward in the width direction of the diaper 1 from the folding lines 10L2 and 10R2 with the folding lines 10L2 and 10R2 as base ends in a state folded toward the top sheet 9 as shown in FIG. The diaper 1 is folded from the base end side pieces 3BL1, 3BR1 by the existing base end side pieces 3BL1, 3BR1 and the folding portions 3BL2, 3BR2 (an example of the "folding line" of the present disclosure) extending in the longitudinal direction of the diaper 1. Free end side pieces 3BL3 and 3BR3 that are bent outward in the width direction and extend outward in the width direction, and free end portions 3BL4 and 3BR4 provided at the tips of the free end side pieces 3BL3 and 3BR3. (an example of "free ends of gathers"). The three-dimensional gathers 3BL, 3BR are in contact along the wearer's skin from the folded portions 3BL2, 3BR2 to the free ends 3BL4, 3BR4. Note that the base end side pieces 3BL1 and 3BR1 are not adhered to the top sheet 9 except at the folding lines 10L2 and 10R2. 4, the free end side pieces 3BL3, 3BR3 and the base end side pieces 3BL1, 3BR1 are not connected at the central portion in the longitudinal direction except at the folded portions 3BL2, 3BR2, and Non-adhesive. The free end side pieces 3BL3, 3BR3 and the base end side pieces 3BL1, 3BR1 may be formed integrally or may be connected separately.

The free ends 3BL4 and 3BR4 overlap the folding lines 10L2 and 10R2 in the thickness direction in a state where the side sheets 10L and 10R are folded before the three-dimensional gathers 3BL and 3BR are formed. The free ends 3BL4 and 3BR4 overlap the folding lines 10L2 and 10R2 even when the three-dimensional gathers 3BL and 3BR are formed. Furthermore, the free ends 3BL4 and 3BR4 are located inside the widthwise ends of the absorbent body 8 by, for example, about 1 mm to 6 mm. The free end portions 3BL4 and 3BR4 are positioned outside or inside the folding lines 10L2 and 10R2 in the width direction by about 2 mm in the state where the side sheets 10L and 10R are folded or the three-dimensional gathers 3BL and 3BR are formed. It may exist at a position shifted by about 2 mm from 0 mm.

FIG. 5 is a plan view showing the back sheet 6, the absorbent core 8c, the top sheet 9, and the side sheets 10L and 10R extracted from the diaper 1 according to this embodiment. FIG. 6 is a cross-sectional view of a cross section including the top sheet 9 and the side sheet 10L when cut along line AA in FIG. The first and second adhesive portions of the three-dimensional gathers 3BL and 3BR provided at the longitudinal ends of the diaper 1 will be described with reference to FIG. 5 and FIG. Although the first and second adhesive portions on the left side of the back body region 1R will be described below, the first and second adhesive portions on the right side of the back body region 1R and the left and right sides of the front body region 1F will be described. Since the same applies to , a description thereof will be omitted.

The diaper 1 has a first adhesive portion 35 that bonds the base end side piece 3BL1 and the top sheet 9 at the longitudinal end, and the free end side piece 3BL3 is superimposed on the base end side piece 3BL1. A second bonding portion 36 is formed at a position that does not overlap the first bonding portion 35 in a plan view, and is bonded to the free end portion side piece 3BL3 and the base end portion side piece 3BL1. The three-dimensional gathers 3BL are fixed to the top sheet 9 by the first adhesive portions 35 in the back body region 1R, which is the longitudinal end portion of the diaper 1, in order to stand up on the skin side in the crotch region 1B. The three-dimensional gather 3BL is the first
In the region where the adhesive portion 35 is not formed, the folding line 10L2 shown in FIG.

The first adhesive portion 35 is formed by applying a hot-melt adhesive onto the top sheet 9 . For this reason, the first adhesive portion 35 becomes hard, but since the first adhesive portion 35 and the second adhesive portion 36 are formed so as not to overlap each other, the first adhesive portion 35 is positioned closer to the skin surface than the first adhesive portion 35 . The free end side piece 3BL3 can move relative to the first adhesive portion 35. As shown in FIG. The diaper 1 can soften the hardness of the first adhesive portion 35 transmitted to the wearer by the relative movement of the free end side piece 3BL3. Thereby, the diaper 1 which concerns on this embodiment can suppress the fall of a wearing feeling. Although the second adhesive portion 36 is formed at a position that touches the wearer's skin, the free end side piece 3BL3 adjacent to the second adhesive portion 36 is relatively movable with respect to the second adhesive portion 36. be. As a result, the diaper 1 can soften the contact of the second adhesive portions 36 against the skin, and can suppress deterioration of wearing comfort.

In addition, the second adhesive portion 36 is formed in a linear region of the free end side piece 3BL3 on the width direction end side of the diaper 1 . By bonding the free end side piece 3BL3 and the base end side piece 3BL1 with the second bonding portion 36 only in the minimum necessary region for the three-dimensional gathers 3BL to stand up without the free end portion 3BL4 being fixed, The area of the second adhesive portion 36 that directly contacts the wearer's skin can be reduced.

The second bonding portion 36 is formed by heat-sealing the free end side piece 3BL3 and the base end side piece 3BL1. This thermal fusion includes ultrasonic fusion. When a hot-melt adhesive is used to form an adhesive portion, the adhesive becomes sticky. Further, if the second adhesive portion 36 is formed with a hot-melt adhesive, the layer formed with the adhesive increases in the portion close to the skin, so that the diaper 1 feels stiff when worn by the wearer. Due to these factors, the diaper 1 is less comfortable to wear. However, the diaper 1 according to the present embodiment forms the second adhesive portion 36 without using a hot-melt adhesive. can suppress the decrease in

A plurality of second bonding portions 36 are formed. The plurality of second adhesive portions 36 are formed so as to be spaced apart from each other and arranged along the longitudinal direction of the diaper 1 . It should be noted that the interval length between the second bonding portions 36 is formed at equal intervals. By forming a plurality of second adhesive portions 36 at intervals, it is possible to form non-adhesive regions between the second adhesive portions 36, and the diaper 1 reduces the hardness generated at the second adhesive portions 36. be able to.

On the other hand, as described above, the first adhesive portion 35 is made of hot-melt adhesive. As a result, the free end side piece 3BL3 can be folded at the folded portion 3BL2, and the three-dimensional gathers 3BL can be adhered to the top sheet 9 in a state in which the base end side piece 3BL1 and the free end side piece 3BL3 are laminated. If the first adhesive portion 35 is formed by heat-sealing the top sheet 9 and the base end side piece 3BL1, the base end side piece 3BL1 and the free end side piece 3BL3 are also heated and fused together. As a result, the three-dimensional gathers 3BL cannot be adhered to the top sheet 9 in a state in which the base end side piece 3BL1 and the free end side piece 3BL3 are laminated, and the manufacturing process of the diaper 1 is increased. The diaper 1 according to this embodiment can prevent an increase in manufacturing steps by forming the first adhesive portion 35 with a hot-melt adhesive.

A plurality of first bonding portions 35 are formed. A plurality of first adhesive portions 35 are formed so as to be spaced apart from each other and arranged along the longitudinal direction of the diaper 1 . In addition, the distance between the first bonding portions 35 is formed at equal intervals. By forming a plurality of spaced first adhesive portions 35, a non-bonded region can be formed between the first adhesive portions 35, and the base end side piece 3BL1 and the top sheet 9 are separated from each other by this non-bonded region. In addition, since the free end side piece 3BL3 laminated on the first adhesive portion 35 can move relative to the base end side piece 3BL1, the first adhesive portion 35 can be moved by the wearer. It can make it hard to feel.

In addition, the rubber thread 10L1 extends along the free end portion 3BL4 in the vicinity of the folded portion 3BL2 of the free end side piece 3BL3, in the vicinity of the free end portion 3BL4, and in the central portion between the folded portion 3BL2 and the free end portion 3BL4. It is arranged inside the 1 adhesion part 35 in the longitudinal direction. In addition, the vicinity of the folded portion 3BL2 where a part of the rubber thread 10L1 is provided is the inner side of the first adhesive portion 35 in the width direction, and is the maximum of the region where the base end portion side piece 3BL1 and the top sheet 9 are not bonded. It is an external neighborhood. Therefore, by pulling the folded portion 3BL2 inward in the longitudinal direction by the rubber thread 10L1, the base end portion side piece 3BL1 on the inner side of the first adhesive portion 35 in the width direction and the top sheet 9 are not bonded together. , the non-bonded base end side piece 3BL1 rises. Therefore, in the longitudinal direction of the diaper 1, the folded portion 3BL2 side of the base end side piece 3BL1 rises before the free end portion 3BL4 of the free end side piece 3BL3. Therefore, the folded portion 3BL2 comes into contact with the skin, and then the free end portion 3BL4 on the inner side in the longitudinal direction of the diaper 1 comes into contact with the skin. Therefore, the entire area from the folded portion 3BL2 to the free end portion 3BL4 is shaped along the skin. That is, since the free end side piece 3BL3 is entirely along the skin, the possibility that the inner space in the width direction and the outer side of the diaper 1 communicate with each other is reduced. In addition, the functions described above of the three-dimensional gathers 3BL and 3BR are more likely to be exhibited. On the other hand, when the contact between the three-dimensional gathers 3BL and the skin is linear in the diaper according to the comparative example, a gap may be formed between the skin and the three-dimensional gathers 3BL. Note that the rubber thread 10L1 may be provided in a place other than these so as to be contractible in the longitudinal direction.

Further, as shown in FIG. 5 , the second adhesive portion 36 is formed further inside (center side) than the first adhesive portion 35 in the longitudinal direction of the diaper 1 . Therefore, in the width direction, there is a region where the second bonding portion 36 is provided but the first bonding portion 35 is not provided. Also from such a structure, when the diaper 1 is put on, the base end side piece 3BL1 on which the first adhesive portion 35 is not provided rises first. The cross-sectional shape perpendicular to the longitudinal direction of the three-dimensional gathers 3BL to be formed is a doglegged shape, which facilitates the formation and maintenance of this shape. In addition, since the folded portion 3BL2 contacts the wearer's skin and then the free end side piece 3BL3 rises, the area from the folded portion 3BL2 to the free end portion 3BL4 contacts the skin. Thereby, the contact between the three-dimensional gathers 3BL and the skin can be planar rather than linear. Therefore, the diaper 1 according to the present embodiment contacts the skin at any position in the region from the folded portion 3BL2 to the free end portion 3BL4 by making the contact between the three-dimensional gathers 3BL and the skin planar. Since contact is possible, it is possible to suppress formation of a gap between the skin and the three-dimensional gathers 3BL.

Further, as shown in FIG. 5, when the diaper 1 is viewed from above, the first adhesive portion 35 is formed on the widthwise outer side of the widthwise inner end portion of the base end portion side piece 3BL1. Accordingly, in the diaper 1, a gap is generated between the top sheet 9 and the base end side piece 3BL1, thereby preventing discharged fluid such as urine flowing on the top sheet 9 from passing over the first adhesive portion 35. The discharged liquid can be introduced to the absorbent body 8 side of the top sheet 9 through the gap.

In addition, there is a non-bonded region between the base end side piece 3BL1 and the top sheet 9 inside the first bonding portion 35 in the width direction. Sheets 11F and 11R are laminated from the skin side (see FIG. 2). In other words, the non-adhesive regions are adhered to the top sheet 9 at the extreme ends in the longitudinal direction. Therefore, when the rubber thread 10L1 provided in the vicinity of the folded portion 3BL2 contracts, the folded portion 3BL2 side of the base end side piece 3BL1 in the longitudinal direction of the diaper 1 is easily erected.

In FIG. 5 , a region in the thickness direction that overlaps the high basis weight portion of the absorbent core 8c in the thickness direction is defined as a high basis weight region 24 (an example of a “high-rigidity portion” of the present disclosure), and overlaps the low basis weight portion of the absorbent core 8c. Regions in the thickness direction are indicated as low basis weight regions 22L and 22R (an example of a “low-rigidity portion” in the present disclosure). Such a high basis weight area 24 and low basis weight areas 22L, 22R extend in the longitudinal direction while maintaining the same width in the wide width portion 88A. Further, as shown in FIG. 5, the side sheets 10L and 10R are laminated on the top sheet 9 in the low basis weight areas 22L and 22R at the ends in the longitudinal direction. The high basis weight area 24 reinforces the absorbent core 8c in areas where pressure is likely to be applied when worn, and prevents the absorbent core 8c from losing its shape. The low-weight areas 22L and 22R are provided in portions that come into contact with the wearer's buttocks when worn, and easily follow the wearer's body surface. The high basis area 24 extends with the same basis weight over the entire extension portion.

According to the diaper 1 as described above, members such as the absorbent core 8c and the top sheet 9 included in the low-basis areas 22L and 22R have boundaries with the high-basis area 24 (an example of the "bending portion" of the present disclosure). It becomes easy to bend toward the skin side as a starting point. Since the side sheets 10L, 10R are provided in the low basis weight areas 22L, 22R, the three-dimensional gathers 3BL, 3BR to be formed are close to the skin side at the ends in the longitudinal direction. As described above, since the entire area from the folded portion 3BL2 to the free end portion 3BL4 is in a state of being easily abutted against the skin, the three-dimensional gathers 3BL and 3BR can prevent discharge on the top sheet 9 from leaking.

The free ends 3BL4 and 3BR4 are positioned near the folding lines 10L2 and 10R2 in a state where the side sheets 10L and 10R are folded before the three-dimensional gathers 3BL and 3BR are formed. Therefore, the rubber threads 10L1 and 10R1 provided along the free ends 3BL4 and 3BR4 contract, so that the side flaps 41L and 41R located on the widthwise outer sides of the narrowest portion 88B and the widened portion 88C move toward the narrowest portion 88B. Start from the width direction edge of the Further, the regions on the longitudinal side from the side flaps 41L, 41R are the low basis weight regions 22L, 22R of the wide portion 88A. As described above, the low weight areas 22L and 22R are likely to bend toward the skin surface, thereby facilitating the erection of the side flaps 41L and 41R. Therefore, the portions of the top sheet 9 positioned at the ends in the width direction of the narrowest portion 88B, the widened portion 88C, and the widened portion 88A stand upright on the skin side. Therefore, the height of the three-dimensional gathers 3BL and 3BR formed increases over the entire longitudinal direction. Therefore, the occurrence of gaps between the wearer's skin and the three-dimensional gathers 3BL, 3BR is suppressed. Therefore, the effect of preventing leakage of the discharged substances existing on the top sheet 9 is improved.

Further, according to the diaper 1 as described above, the free ends 3BL4 and 3BR4 are located inside the widthwise ends of the absorber 8 in a state where the three-dimensional gathers 3BL and 3BR are formed. Therefore, even when the rubber threads 10L1, 10R1 provided near the free ends 3BL4, 3BR4 contract, the ends in the width direction of the absorber 8 are prevented from breaking toward the non-skin surface side. Therefore, it is possible to prevent the folded portions 3BL2, 3BR2 to the free ends 3BL4, 3BR4 of the three-dimensional gathers 3BL, 3BR from coming into contact with the wearer's skin due to the absorber 8 being folded toward the non-skin side.

Further, according to the diaper 1 as described above, the absorbent core 8c included in the low-weight areas 22L and 22R may not only bend at the boundary with the high-weight area 24, but also lose its shape. However, since the side sheets 10L and 10R are laminated on the top sheet 9 included in the low basis weight areas 22L and 22R, the bending rigidity in the lamination area of the top sheet 9 and the side sheets 10L and 10R is improved. Therefore, the shape loss of the absorbent core 8c included in the low weight areas 22L and 22R is suppressed.

Further, according to the diaper 1 as described above, part of the rubber thread 4F2 and the rubber thread 4R2 on the side of the crotch region 1B overlaps the absorbent core 8c. Therefore, when the rubber threads 4F2 and 4R2 contract in the width direction, the absorbent core 8c overlapping the rubber threads 4F2 and 4R2 on the skin side protrudes toward the skin side, making it easier to approach the skin.

Further, according to the diaper 1 as described above, as shown in FIG. (See FIG. 3). The contraction of the rubber threads 4F3 and 4R3 pulls the side flaps 41L and 41R in the direction of contraction (outside in the width direction). This also facilitates the erection of the side flaps 41L and 41R along the line extending in the longitudinal direction through the widthwise ends of the narrowest portion 88B. In other words, even if the upper absorbent mat 8a has constrictions and the wide portion 88A exists, the side flaps 41L and 41R rise following the rise of the side sheets 10L and 10R. Therefore, the portions of the top sheet 9 extending in the longitudinal direction from the side flaps 41L, 41R also stand up following the side flaps 41L, 41R. Therefore, the height of the three-dimensional gathers 3BL and 3BR as shown in FIG. 4 increases in the entire longitudinal direction. Therefore, the effect of preventing leakage of the discharged substances existing on the top sheet 9 is improved.

On the other hand, as a diaper according to the comparative example, for example, when the rubber threads 4F3 and 4R3 are provided without overlapping the side flaps 41L and 41R in the thickness direction, the width of the upper absorbent mat 8a existing in the longitudinal direction of the side flaps 41L and 41R is increased. Since the rigidity of the portion 88A is high, there is a possibility that the side flaps 41L, 41R will be restrained from rising following the rising of the side seats 10L, 10R. Therefore, the height of the three-dimensional gathers 3BL and 3BR does not increase, and there is a possibility that the effect of preventing leakage of the discharged matter present on the top sheet 9 will be reduced.

Further, as shown in FIG. 3, the hot-melt adhesive HM that bonds the non-skin surface side of the absorbent core 8c and the lower core wrap sheet 7b is divided into three-dimensional gathers 3BL and 3BR when the diaper 1 is viewed in the thickness direction. It is arranged between the three-dimensional gathers 3BL and 3BR so as not to overlap. Since the absorbent core 8c is easily bent in the region where the hot-melt adhesive HM is not provided, the absorbent core 8c under the three-dimensional gathers 3BL and 3BR is relatively easily bent. When the three-dimensional gathers 3BL, 3BR rise to the skin surface side, the absorbent core 8c is also bent from the lower layer of the three-dimensional gathers 3BL, 3BR to the skin surface side, so that the entire area from the folded portion 3BL2 to the free end portion 3BL4 of the three-dimensional gathers 3BL, 3BR is It can hold the state along the skin.

Next, the form of adhesion between the exterior sheet and the absorbent body 8 in this embodiment will be described. FIG. 7 is a plan view of the diaper 1 in an unfolded and extended state. In FIG. 7, the cover sheet 4, rubber threads 4F3 and 4R3, inner cover sheet 5, absorbent body 8, and top sheet 9 are extracted and shown.

In the diaper 1 according to this embodiment, the outer sheet is composed of the cover sheet 4 and the inner cover sheet 5 . The thread rubbers 4F3 and 4R3 are bonded between the cover sheet 4 and the inner cover sheet 5 in a stretched state. The outer sheet is adhered to the back sheet 6 by the third adhesive portion 37 . The absorbent body 8 is adhered to the outer sheet by the third adhesive portion 37 via the back sheet 6 . The third adhesive portion 37 is formed by applying a hot-melt adhesive.

As shown in FIG. 1, the exterior sheet is joined at its left and right ends in the width direction to form a torso opening 2T through which the wearer's abdominal circumference can be inserted and a left lower leg through which the wearer's legs can be inserted. An opening 2L and a lower right leg opening 2R are formed. Here, the rubber thread 4F3 extends along the left lower leg opening 2L, across the crotch, and along the right lower leg opening 2R, and is adhered to the exterior sheet in a stretched state. Further, the thread rubber 4R3 is adhered to the exterior sheet in a stretched state. The thread rubber 4R3 is arranged at a portion where the inner end portion in the width direction overlaps with the absorbent core 8c of the absorbent body 8 when viewed in the thickness direction.

The plurality of third adhesive portions 37 extend in the width direction of the diaper 1 and are spaced apart from each other in the longitudinal direction of the diaper 1 . The third bonding portion 37 is not provided in the region where the rubber thread 4F3 crosses the absorbent body 8 in the crotch portion, and the exterior sheet and the absorbent body 8 are not bonded in this region. This area corresponds to the pubic bone of the wearer, and in this area, the outer sheet is lifted toward the skin surface by the biasing force of the rubber thread 4F3, and the absorber 8 is made to follow the skin surface of the pubic bone of the wearer. be able to.

Further, the rubber thread 4R3 does not cross the absorber 8, but is divided into left and right by being cut at the central portion in the width direction. The portion where the left and right rubber threads 4R3 are cut corresponds to the wearer's anus. In the area corresponding to the wearer's anus, the diaper 1 prevents the biasing force of the rubber thread 4R3 from being transmitted to the absorbent body 8 via the exterior sheet, thereby forming a space between the absorbent body 8 and the anus. can. The diaper 1 can accommodate feces excreted by the wearer in this space.

Here, since the rubber thread 4F3 is not adhered to the absorbent body 8 in the region where the rubber thread 4F3 crosses the absorbent body 8 in the crotch part, the absorbent body 8 does not shrink in the width direction in this region. When the absorber 8 shrinks in the width direction, the standing up of the three-dimensional gathers 3BL, 3BR is hindered, but in the diaper 1 according to the present embodiment, the contraction of the rubber thread 4F3 hinders the standing up of the three-dimensional gathers 3BL, 3BR. never. In addition, the rubber thread 4R3 can separate the absorber 8 from the wearer's skin (anus) in the region corresponding to the anus. Therefore, on the back side, the elastic thread 4R3 can separate the absorber 8 from the wearer's skin, thereby allowing the three-dimensional gathers 3BL and 3BR to stand up more on the back side. The thread rubbers 4F3 and 4R3 can maintain the standing state of the three-dimensional gathers 3BL and 3BR without hindering the standing of the three-dimensional gathers 3BL and 3BR. By maintaining this upright state, the three-dimensional gathers 3BL and 3BR stand up and no gap is formed between the wearer's skin and the three-dimensional gathers 3BL and 3BR, that is, the free end from the folded portion 3BL2. The entire area of the portion 3BL4 can be maintained in a state of being in line with the skin.

Also, in the narrowest portion 88B of the absorbent core 8c, the third bonding portion 37 is formed to have the same width as the narrowest portion 88B. Since the side flaps 41L and 41R are not adhered to the exterior sheet (specifically, the inner cover sheet 5), the side flaps 41L and 41R can easily stand up toward the skin.

FIG. 8 is a cross-sectional view of the front body region or the back body region of the diaper 1 according to this embodiment, taken along the width direction. FIG. 8 shows the cross-sectional structure of the wide portion 88A of the absorbent core 8c. As shown in FIG. 8, the widthwise end portions of the absorbent core 8c are ear portions 88L and 88R, which are wide portions. Note that FIG. 10 shows the ear portions 88L and 88R surrounded by dotted lines. The ear portions 88L and 88R are portions wider in the width direction outside than the narrowest portion 88B of the absorbent core 8c. The ear portions 88L and 88R are not adhered to the lower core wrap sheet 7b by the hot-melt adhesive HM, and are less rigid than the areas coated with the hot-melt adhesive. Therefore, the ear portions 88L and 88R of the absorbent core 8c are easily bent toward the skin surface. Further, when viewed in the thickness direction, the three-dimensional gathers 3BL and 3BR are accommodated within the ear portions 88L and 88R. With this configuration, the contractile force of the rubber threads 10L1 and 10R1 of the three-dimensional gathers 3BL and 3BR of the diaper 1 is applied to the easily bent ear portions 88L and 88R. In the diaper 1, the three-dimensional gathers 3BL and 3BR are erected by bending the ear portions 88L and 88R toward the skin surface, and no gap is formed between the wearer's skin and the three-dimensional gathers 3BL and 3BR. , the entire area from the folded portion 3BL2 to the free end portion 3BL4 can be maintained in a state along the skin.

<Modification 1>
Next, the diaper 1 according to Modification 1 of the present embodiment will be described. FIG. 9 is a plan view showing the back sheet 6, the absorbent core 8c, the top sheet 9, and the side sheets 10L and 10R extracted from the diaper 1 according to this modification. In the diaper 1 according to this modified example, the first adhesive portion 35 is formed in a curved shape. For example, the first bonding portion 35 may be formed with a spiral curve. Also, the first bonding portion 35 may be formed with a wavy curve. Note that these curved lines may include circular arcs or elliptical arcs. A plurality of curved first bonding portions 35 are formed apart from each other, and the plurality of first bonding portions 35 may extend along the longitudinal direction of the diaper 1 . In the diaper 1 according to this modification, by forming the first adhesive portions 35 in a curved shape, the area of the first adhesive portions 35 can be reduced, and the contact of the first adhesive portions 35 with the skin can be further softened.

<Modification 2>
Next, the diaper 1 according to Modification 2 of the present embodiment will be described. FIG. 10 is a plan view showing the back sheet 6, the absorbent core 8c, the top sheet 9, and the side sheets 10L and 10R extracted from the diaper 1 according to this modification. In the diaper 1 according to this modified example, the second adhesive portion 36 is formed in a curved shape. For example, the second adhesive portion 36 may be formed with a spiral curve. Also, the second bonding portion 36 may be formed with a wavy curve. Note that these curved lines may include circular arcs or elliptical arcs. A plurality of curved second adhesive portions 36 are formed apart from each other, and the plurality of second adhesive portions 36 may extend along the longitudinal direction of the diaper 1 . In the diaper 1 according to this modification, by forming the second adhesive portions 36 in a curved shape, the area of the second adhesive portions 36 can be reduced, and the contact of the second adhesive portions 36 with the skin can be further softened.

<Modification 3>
Next, the diaper 1 according to Modification 3 of the present embodiment will be described. FIG. 11 is a diagram schematically showing a cross-sectional structure of a diaper according to this modification. FIG. 11 shows cross sections of the front body region and the back body region of the diaper 1 according to this modification. The absorbent body 8 includes a core wrap sheet 7 and an absorbent core 8c made up of a plurality of absorbent mats wrapped in the core wrap sheet 7 . In the modification shown in this figure, the absorbent core 8c has an upper absorbent mat 8a and a lower absorbent mat 8b. The upper absorbent mat 8a is positioned on the skin side of the wearer when worn, and has an hourglass shape with a constriction in the crotch area when viewed from above. The upper absorbent mat 8a extends to the vicinity of the widthwise end of the absorbent body 8 in the vicinity of the longitudinal end. On the other hand, the lower absorbent mat 8b is positioned on the non-skin surface side of the wearer when worn, and has a rectangular shape in plan view. The lower absorbent mat 8b extends only to the central portion of the absorbent body 8, the portion corresponding to the midline of the wearer, and its overall width is equal to or less than the constricted portion of the upper absorbent mat 8a. That is, the lower absorbent mat 8b is laminated with the upper absorbent mat 8a so that the upper absorbent mat 8a completely hides the lower absorbent mat 8b when viewed from the skin side.

Since the crotch region 1B is sandwiched between the wearer's legs, a compressive pressure is applied to the inner side in the width direction. On the other hand, in the front body region 1F and the back body region 1R, pressure is applied in the thickness direction of the absorbent core 8c due to the weight of the wearer. Therefore, by forming a constriction in the crotch area of the absorbent core 8c and laminating the upper absorbent mat 8a and the lower absorbent mat 8b, the absorbent core 8c in the crotch area is made to have a higher basis weight to prevent the absorbent core 8c from deforming inward in the width direction. In addition, in the front body region and the back body region, the width of the absorbent core is increased to increase the area on which weight is applied, thereby preventing deformation in the thickness direction. For this reason, it is preferable to make the absorbent core 8c into an hourglass shape.

In the upper absorbent mat 8a, in addition to cellulose-based short fibers or hydrophilic-treated resin-based short fibers (hereinafter referred to as short fibers), hydrophilic fibers having a crosslinked structure capable of absorbing and retaining water are provided. contains granular absorbent resins (SAP particles) such as superabsorbent polymers of When discharged fluid is discharged from the wearer and permeates the absorbent core 8c, the particles of SAP absorb moisture and gradually expand to fix the discharged fluid and prevent it from flowing back to the skin side. On the other hand, the weight per unit area of the SAP particles contained in the lower absorbent mat 8b is lower than that of the upper absorbent mat 8a. Alternatively, the lower absorbent mat 8b may be formed only from short fibers without containing SAP particles.

In this figure, the absorbent core 8c is wrapped in a water-permeable core wrap sheet 7. As shown in FIG. Furthermore, the core wrap sheet 7 is divided into an upper layer core wrap sheet 7f positioned on the wearer's skin side when worn and a lower layer core wrap sheet 7b positioned on the wearer's non-skin side when worn. The upper layer core wrap sheet 7f and the lower layer core wrap sheet 7b are adhered to each other at the skin side end portion of the absorbent core 8c. The upper layer core wrap sheet 7f is adhered to the upper layer absorbent mat 8a. The lower layer core wrap sheet 7b is adhered to the lower layer absorbent mat 8b. However, the non-skin surface side of the upper absorbent mat 8a and the lower core wrap sheet 7b are not adhered. For this reason, in the absorbent body 8, there is a channel 8s between the lower layer core wrap sheet 7b and the lower layer core wrap sheet 7b at a position further outside the width direction end of the lower layer absorbent mat 8b where the upper layer absorbent mat 8a extends. is formed.

Further, the bonding strength between the lower core wrap sheet 7b and the upper absorbent mat 8a may be lower than that between the lower core wrap sheet 7b and the lower absorbent mat 8b. As a specific example, the width of the adhesive that adheres the lower core wrap sheet 7b and the lower absorbent mat 8b is made wider than the width of the lower absorbent mat 8b, and only the ends of the adhesive adhere to the upper absorbent mat 8a. You may make it adhere|attach with a skin surface side. Also, an adhesive having a low adhesive strength may be used to bond the lower core wrap sheet 7b and the upper absorbent mat 8a together, or the amount of the adhesive used for this purpose may be reduced. The adhesive peels off when the lower absorbent mat 8b absorbs water and swells, or when discharged liquid flows between the lower core wrap sheet 7b and the upper absorbent mat 8a, forming the flow path 8s. . If the flow paths 8s are formed even when the diaper 1 does not absorb water and the flow paths 8s are unnecessary, the flow paths 8s may cause the absorbent core 8c to lose its shape. If the channel 8s is formed only when the absorbent core 8c absorbs water, the channel 8s can be formed only when necessary. In the diaper 1 according to this modification, urine can be diffused to the wide portion 88A shown in FIG. 3(B) by the channel 8s.

<Other embodiments>
Next, another embodiment will be described. In the above embodiment, a tape-type disposable diaper has been described as an example, but the present invention is not limited to this, and the present invention can also be applied to absorbent articles such as underpants-type disposable diapers and absorbent pads. . Moreover, in the above-described embodiment, the first bonding portion 35 and the second bonding portion 36 are formed in a dotted line shape along the longitudinal direction, but the present invention is not limited to this. For example, the first bonding portion 35 and the second bonding portion 36 may be formed continuously in a straight line. Also, both the first bonding portion 35 and the second bonding portion 36 may be formed in a curved shape.

Also, the end sheets 11F and 11R may not be provided. Further, the absorbent core 8c may not have the high basis weight area 24 and the low basis weight areas 22L and 22R, and may have a uniform basis weight. Further, the high basis weight area 24 and the low basis weight areas 22L, 22R have a uniform basis weight, and the area corresponding to the high basis area 24 is formed thicker than the areas corresponding to the low basis weight areas 22L, 22R. may improve stiffness. Also, the thread rubbers 4F2 and 4R2 do not have to overlap the absorbent core 8c. Further, the thread rubbers 4F3 and 4R3 may not be provided on the widthwise outer side of the widened portion 88C and on the longitudinally inner side of the widened portion 88A. Further, the rubber thread 10L1 may not be provided on the inner side in the width direction of the first adhesive portion 35 and on the outermost portion of the region where the base end side piece 3BL1 and the top sheet 9 are not bonded. Further, the second adhesive portion 36 does not have to be formed further inside the diaper 1 in the longitudinal direction than the first adhesive portion 35 . In addition, the folding lines 10L2 and 10R2 may be provided at positions overlapping the ends of the absorbent body 8 in the width direction or outside the ends in the width direction. Further, the free ends 3BL4 and 3BR4 may be positioned outside the widthwise ends of the absorber 8 in a state where the three-dimensional gathers 3BL and 3BR are formed. Also, the back seat 6 does not have to overlap the side flaps 41L and 41R.

The embodiments and modifications disclosed above can be combined.

1B: Crotch region 1F: Front body region 1R: Back body region 2L: Left lower leg opening 2R: Right lower leg opening 2T: Body opening 3BL, 3BR: Three-dimensional gathers 3BL1, 3BR1: Base end side pieces 3BL2, 3BR2: Folded portions 3BL3, 3BR3: Free end side pieces 3BL4, 3BR4: Free end portions 3LL, 3LR: Leg gathers 3R: Waist gathers 4: Cover sheets 4F1, 4F2, 4F3, 4R1, 4R1, 4R2, 4R3: Rubber threads 4F4, 4F5 , 4R4, 4R5: Edge 4FF, 4RF: Folding line 5: Inner cover sheet 6: Back sheet 6A: Folding part 7: Core wrap sheet 7b: Lower layer core wrap sheet 7f: Upper layer core wrap sheet 8: Absorbent body 8a: Upper layer absorption Mat 8b: Lower layer absorbent mat 8c: Absorbent core 8s: Flow path 9: Top sheets 10L, 10R: Side sheets 10L1, 10R1: Rubber threads 10L2, R2: Folding lines 11F, 11R: End sheets 22L, 22R: Low basis weight area 24 : High basis weight areas 30L, 30R : Non-permeable portion 35 : First adhesive portion 36 : Second adhesive portion 37 : Third adhesive portion 41L, 41R : Side flap 88A : Wide portion 88B : Narrowest portion 88C : Widened portion 88L, 88R: ears

Claims (10)

An absorbent article having a length along a longitudinal direction and a length along a width direction orthogonal to the longitudinal direction,
an absorbent body having an absorbent core capable of absorbing a wearer's discharged liquid and a water-permeable sheet covering the absorbent core;
a top sheet having a water-permeable region provided on the skin surface side of the absorbent body;
a water-impermeable side sheet, which is a side sheet for forming three-dimensional gathers, provided closer to the skin than the top sheet;
a first stretchable member provided on the side seat so as to be stretchable in the longitudinal direction,
The absorbent core has a constricted shape in the width direction at the central portion in the longitudinal direction, the narrowest portion in the crotch region, the widened portions in the front body region and the back body region, and the narrowest portion and the widened portion. and has a widened portion sandwiched between
The width of the water-permeable sheet covering the absorbent core is substantially the same as the width of the wide portion and substantially constant in the longitudinal direction,
The top sheet outside the narrowest portion in the width direction is provided so as to be able to stand on the skin surface side along a line extending in the longitudinal direction passing through the end of the narrowest portion in the width direction,
The top sheet and the side sheets are connected near the outer end in the width direction of the wide portion, and a connecting portion including a standing line when the three-dimensional gathers are raised,
The three-dimensional gathers include a base end portion provided at the connection portion, a free end provided along the longitudinal direction at an end portion on the skin surface side opposite to the base end portion, the base end portion and the a fold line provided between the free end and extending in the longitudinal direction;
The free end is in the vicinity of the standing line when the side sheets in the superimposed state are viewed from above, and
The first elastic member is provided along the free end,
The three-dimensional gathers stand up on the skin surface side of the top sheet as the standing line and extend inward in the width direction from the standing line,
absorbent article. The absorbent core has a bending portion that facilitates bending of the widthwise end portion toward the skin surface with respect to the widthwise central portion,
The absorbent article according to claim 1. The absorbent core has a high-rigidity portion on the center side in the width direction and a low-rigidity portion on the end side in the width direction at least at the ends in the longitudinal direction,
The bent portion is formed between the high-rigidity portion and the low-rigidity portion,
The longitudinal ends of the three-dimensional gathers are laminated to the top sheet in a region overlapping with the low-rigidity portion,
The absorbent article according to claim 2. The standing line is provided inside the widthwise end of the absorbent body,
The absorbent article according to claim 1 or 2. The free end is provided on the side sheet in a superimposed state so as to be located at a position overlapping the standing line or in the vicinity of the standing line in a state where the three-dimensional gathers are formed.
The absorbent article according to claim 1 or 2. further comprising a water-impermeable back sheet covering the non-skin surface side of the absorbent body,
The back sheet is provided so as to overlap with the top sheet in a region outside the widened portion in the width direction and inside the region in the longitudinal direction relative to the wide portion.
The absorbent article according to claim 1 or 2. The free end is provided inside the end of the absorbent body in the width direction in a state where the three-dimensional gathers stand on the skin surface side.
The absorbent article according to claim 1 or 2. an exterior sheet arranged on the non-skin surface side of the absorber and forming a waist opening through which the wearer's abdominal circumference can be inserted and two leg openings through which the wearer's legs can be inserted;
It is provided on the abdomen of the wearer along one of the leg openings so as to cross the crotch part, extends along the other leg opening, and is provided on the exterior sheet in a stretched state. a second stretchable member;
A third stretchable member provided on the exterior sheet in a stretched state on the back side of the wearer, wherein the inner end portion in the width direction overlaps the absorber when viewed in the thickness direction. a third elastic member;
The absorbent article according to claim 1 or 2, comprising: A bonding portion that bonds the absorbent body and the exterior sheet,
The adhesive portion is not provided in a region where the second elastic member crosses the absorbent body,
The absorbent article according to claim 8. A plurality of the adhesive portions are provided,
each of the plurality of bonding portions extends in the width direction and is provided apart from each other in the longitudinal direction;
The adhesive portion is formed to have the same width as the narrowest portion of the absorbent core,
The absorbent article according to claim 9.

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