JP2023062662A - absorbent article - Google Patents

Abstract

To provide a technique which suppresses leakage of excrement from a gap between a skin of a wearer and three-dimensional gatherings when an absorbent article has the three-dimensional gatherings extending in a longitudinal direction at an end part in a width direction of a top sheet.SOLUTION: An absorbent article related to one aspect of the invention includes: an absorbent core; a top sheet provided on a skin surface side of the absorbent core; a rising line in a longitudinal direction on a skin surface side of the top sheet; a leakage prevention wall having a base end part provided on the rising line, a free end provided in the longitudinal direction at an end part on a skin surface side on the opposite side of the base end part, and a folding line provided between the base end part and the free end part and extends in the longitudinal direction; and a first stretchable member provided on the leakage prevention wall in the longitudinal direction to stretch.SELECTED DRAWING: Figure 5

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. 2. To provide a technique capable of suppressing the leakage of excrement from the gap between the wearer's skin and the three-dimensional gathers.

In order to solve the above problems, in the present invention, the three-dimensional gather has a shape folded back from the inside to the outside in the width direction at the fold line on the inside in the width direction, and the first elastic member is provided near the fold line, At the longitudinal ends of the three-dimensional gathers, the base ends of the three-dimensional gathers are adhered to the top sheet in the width direction outside the folding line provided near the first elastic member.

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. an absorbent core, a top sheet provided on the skin surface side of the absorbent core, a leak-proof wall provided on the skin surface side of the top sheet along the longitudinal direction, and a pair of standing lines provided along the longitudinal direction for standing the leak-proof wall on the skin surface side; The anti-leakage wall includes a base end provided on the standing line, a free end provided along the longitudinal direction at an end on the skin surface side opposite to the base end, a base end and the a free end and a fold line extending in the longitudinal direction, and a first region of the leak-proof wall between the standing line and the folding line a first non-adhesive region which is superimposed on the top sheet on the inner side in the width direction and which is not adhered to the top sheet except for the standing line or the base end; a first adhesive portion bonded to the top sheet from the fold line to the outside in the width direction, and a second region of the leak-proof wall from the fold line to the free end; , a second non-bonded region that is folded back along the fold line so as to be laminated on the skin surface side of the first region, and that is non-bonded in a region other than the region where the fold line is provided; and a second adhesive portion, at least the free end of which is bonded to the first region at the longitudinal end portion where the first adhesive portion is provided, wherein the first elastic member has at least In the fold line or the second region, the grooves are provided on the fold line side of the central portion in the width direction, and on the free end side of the free end or the central portion.

In the above absorbent article, the absorbent core has, at least at the ends in the longitudinal direction, bending portions for facilitating bending of the ends in the width direction toward the skin surface with respect to the central portion in the width direction, The longitudinal ends of the leak-proof wall may be laminated on the top sheet in a region overlapping the absorbent core on the widthwise end side with respect to the folded 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, The bent portion is formed between the high-rigidity portion and the low-rigidity portion, and the longitudinal end portion of the leak-proof wall is laminated on the top sheet in a region overlapping with the low-rigidity portion. good.

In the absorbent article, a second stretchable member that stretches in the width direction may be laminated at the longitudinal end of the absorbent core.

In the above absorbent article, the absorbent core has a narrowed 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 widest part. A third elastic property that has a widened portion sandwiched between the narrow portion and the widened portion, and expands and contracts in the widthwise direction outside the widened portion in the width direction and inside the widened portion in the longitudinal direction. The members may be laminated.

In the absorbent article described above, the first stretchable member may be provided so as to overlap with the outermost portion in the width direction of the first non-bonded region on the inner side of the first bonded portion in the width direction.

In the absorbent article described above, the second adhesive portion may extend further inward than the first adhesive portion in the longitudinal direction.

In the absorbent article described above, the second adhesive portion may be formed in a linear region in the second region on the free end side.

In the absorbent article described above, in the first non-adhesive region on the folding line side of the first adhesive portion, the longitudinal endmost portion of the leak-proof wall may be adhered to the top sheet.

The absorbent article may further include an end sheet laminated on the skin surface side of the leak-proof wall at the outermost end.

In the absorbent article, a plurality of the first stretchable members are arranged between the folding line and the free end, and the first stretchable member on the free end side has, when viewed in the thickness direction, It may overlap with the second adhesive portion.

In the absorbent article, a plurality of the first stretchable members are arranged between the fold line and the free end, and the first stretchable member on the fold line side is the stretchable member on the free end side. The draft rate may be higher than that of the first elastic member.

According to the present invention, when the absorbent article has three-dimensional gathers extending in the longitudinal direction at the ends of the top sheet in the width direction, exudates do not leak through the gap between the wearer's skin and the three-dimensional gathers. can be suppressed.

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 according to the 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 an overview of a plan view of a diaper according to a first modified example. FIG. 8 is an example of a schematic plan view of a diaper according to a second modification. FIG. 9 is an example of a cross-sectional view including a top sheet and side sheets of a diaper according to a third modification. FIG. 10 is an example of a schematic diagram of a cross-sectional structure of a diaper according to a fourth modified example.

<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 perpendicular 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 includes a crotch region 1B, which corresponds to the crotch region covering the wearer's pubic region (crotch) in the worn state, and a region corresponding to the front body around the wearer's waist, which 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 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 . Note that the three-dimensional gathers 3BL and 3BR are examples of the "leakage prevention wall" of the present disclosure.

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. Further, 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 one mat and a core wrap sheet 7 wrapping the absorbent core 8c. In this embodiment, as shown in FIG. 2, 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, 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. 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. Also, the shape loss 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.

Further, the diaper 1 has elongated belt-like side sheets 10L, 10R for forming the three-dimensional gathers 3BL, 3BR described above (an example of the "end sheet" of the present disclosure). The side sheets 10L and 10R are provided on the long sides of the top sheet 9. As shown in FIG. Thread rubbers 10L1 and 10R1 (an example of the "first stretchable 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 to each other, 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. 10R is pulled in the longitudinal direction by the contractile force of the rubber threads 10L1 and 10R1, and the top sheet 9 is folded along a pair of folding lines 10L2 and 10R2 (an example of the "upright line" referred to in the present application) provided on the skin surface side. get up from As a result, three-dimensional gathers 3BL and 3BR are formed to prevent liquid from flowing out from the left leg opening 2L and the right lower leg opening 2R (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 defined as side flaps 41L and 41R.

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 attached to the front body region of the cover sheet 4 with rubber threads (rubber threads) 4F1 and 4F2 in a stretched state, and the rubber thread (rubber thread) 4R1 is attached to the back body region of the cover sheet 4. , 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. Note that the rubber threads 4F2 and 4R2 are examples of the "second stretchable member" in the present disclosure.

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, when an inner pad is used, displacement of the inner pad is suppressed.

Furthermore, the rubber thread 4F3 and the rubber thread 4R3 are adhered to the cover sheet 4 in a stretched state (an example of the "third stretchable member" of the present disclosure). 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. However, 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 arranged in a curved manner toward the crotch region 1B, forming an hourglass-shaped absorbent core 8c. It overlaps with a part of the core wrap sheet 7 at the constricted portion. By configuring in this way, the arrangement regions of the rubber threads 4F3 and 4R3 can function as the leg gathers 3LL and 3LR.

More specifically, the rubber threads 4F3 and 4R3 are provided on the outside in the width direction of the widened portion 88C along the constriction of the cover sheet 4. As shown in FIG. The widthwise inner end portions of the thread rubbers 4F3 and 4R3 are provided along the widthwise direction. Further, the vicinity of the ends in the width direction inner side of the thread rubbers 4F3 and 4R3 overlap a part of the absorbent body 8 and the side flaps 41L and 41R of the top sheet 9 on the width direction outer side of the widened portion 88C. However, the ends of the rubber threads 4F3 and 4R3 on the inner side in the width direction overlap with the core wrap sheet 7 forming the outermost layer of the absorbent body 8, and although they are adjacent to the absorbent core 8c, they do not overlap. As the rubber threads 4F3 and 4R3 contract in the direction in which they 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 that allow

With this configuration, when not worn, the absorbent core 8c is kept in shape because the contractile force of the leg gathers 3LL and 3LR does not act on the absorbent core 8c. On the other hand, when worn, the absorbent core 8c located in the crotch region 1B may be pressed by the wearer's legs. However, even in such a case, the tips of the leg gathers 3LL and 3LR are provided on the widthwise outer side of the widened portion 88C of the absorbent body 8, and the crotch region 1B is urged to spread the absorbent body 8 widthwise outwardly. It is possible to prevent the shape loss of the absorbent core 8c at the time.

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 .

Since the crotch region is sandwiched between the wearer's legs, a compressive pressure is applied to the inside in the width direction. On the other hand, in the front body region and the back body region, 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 region of the absorbent core 8c, it is possible to prevent the absorbent core 8c 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 the absorbent core 8c, in addition to cellulose-based short fibers or hydrophilic-treated resin-based short fibers (hereinafter referred to as short fibers), a hydrophilic hydrophilic material having a crosslinked structure capable of absorbing and retaining water is provided. Particulate absorbent resins (SAP particles) such as superabsorbent polymers are included. 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.

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 core wrap sheet 7b is adhered to the non-skin surface side of the absorbent core 8c with a hot-melt adhesive HM.

The adhesive strength between the absorbent core 8c and the upper layer core wrap sheet 7a is stronger than the adhesive strength between the absorbent core 8c and the lower layer core wrap sheet 7b. As a specific example, the width of the adhesive HM that bonds the upper layer core wrap sheet 7a and the absorbent core 8c is made wider than the width of the absorbent core 8c, and the adhesive that bonds the lower layer core wrap sheet 7b and the absorbent core 8c. The width of HM may be narrower than the width of the absorbent core 8c. Also, in order to adhere the absorbent core 8c and the lower core wrap sheet 7b, the amount of the adhesive HM applied may be reduced, and an adhesive HM having a low adhesive strength may be used. Alternatively, the application range of the adhesive HM used for the purpose can be limited. Therefore, when a force is applied to separate the absorbent core 8c and the core wrap sheet 7, the absorbent core 8c and the lower core wrap sheet 7b are relatively easily peeled off. When the absorbent core 8c absorbs water and swells, or when discharged liquid flows between the lower layer core wrap sheet 7b and the absorbent core 8c, the adhesive HM will not adhere to the lower layer core wrap sheet 7b and the absorbent core 8c. When a force is applied to pull them apart, they are easily peeled off to form a flow path. If the flow path is formed even when the diaper 1 does not absorb water and the flow path is unnecessary, the flow path may cause the absorbent core 8c to lose its shape. If the flow path is formed only when the absorbent core 8c absorbs water, the flow path can be formed only when necessary.

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 non-woven 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. In addition, the impermeable portions 30L and 30R are formed by a hot-melt adhesive having impermeability. The water-impermeable portions 30L and 30R prevent the discharged liquid that has permeated the top sheet 9 from leaking along the folded portions 6A of the back sheet 6 and from the widthwise end portions of the absorbent body 8. As shown in FIG. The impermeable portions 30L and 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 widthwise end of the absorbent body 8 .

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 to form impermeable portions 30L, 30R. The top sheet 9 and the side sheets 10L and 10R are adhered by applying this hot-melt adhesive. The water impermeable portions 30L, 30R suppress the intrusion of discharged liquid between the side sheets 10L, 10R and the top sheet 9, thereby suppressing the leakage of the liquid from the width direction end portions of the diaper 1. - 特許庁

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.

In addition, 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 and 30R are formed between the top sheet 9 and the side sheets 10L and 10R and the hardened hot-melt adhesive applied between the top sheet 9 and the side sheets 10L and 10R. In this way, the water-impermeable portions 30L and 30R extending over the skin surface side and the non-skin surface side of the top sheet 9 are integrally formed by applying the hot-melt adhesive once. In the diaper 1, the discharged liquid does not permeate the top sheet 9 and reach the non-skin side from the width direction end side, and leakage of the liquid from the non-skin side can also 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 water-impermeable portions 30 are made of a hot-melt adhesive, the regions where these water-impermeable portions are formed are harder than when the water-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.

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. By the existing base end side pieces 3BL1, 3BR1 (an example of the “first region” of the present disclosure) and the folded portions 3BL2, 3BR2 extending in the longitudinal direction of the diaper 1 (an example of the “folding line” of the present disclosure) free end side pieces 3BL3, 3BR3 (an example of the “second region” of the present disclosure) that are bent outward in the width direction of the diaper 1 from the base end side pieces 3BL1, 3BR1 and extend outward in the width direction; and free ends 3BL4 and 3BR4 (an example of the “free ends of three-dimensional gathers” of the present disclosure) provided at the ends of the side pieces 3BL3 and 3BR3. 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 (an example of the "first non-adhesive region" of the present disclosure). 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 It is non-adhesive (an example of the "second non-adhesive region" of the present disclosure). The free end side pieces 3BL3, 3BR3 and the base end side pieces 3BL1, 3BR1 may be formed integrally or may be connected separately.

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 gathers 3BL rise on the skin surface side with folding lines 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 required region for the three-dimensional gathers 3BL to stand 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. 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 in the longitudinal direction from the first adhesive portion 35 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. is placed inside the In addition, the vicinity of the folded portion 3BL2 where part of the rubber thread 10L1 is provided is the inner side in the width direction of the first adhesive portion, and is the outermost portion of the region where the base end portion side piece 3BL1 and the top sheet 9 are not bonded. Nearby. Therefore, by pulling the folded portion 3BL2 inward in the longitudinal direction by the rubber thread 10L1, the base end side piece 3BL1 on the inner side in the width direction of the first adhesive portion and the top sheet 9 are not adhered to each other over the entire region. , 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-back 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 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 bonded portion in the width direction. 11F and 11R are laminated from the skin surface 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.

Further, as described above, the absorbent core 8c included in the absorbent body 8 has a high basis weight portion and a low basis weight portion. The high basis weight part is provided in the center part in the width direction and extends in the front and rear of the absorbent core 8c with the same width as the constricted part of the crotch region 1B. The low basis weight portion is a portion that spreads outward in the width direction from the constricted portion. The high basis weight part extends to a portion corresponding to the wearer's excretion hole and absorbs discharged liquid. In addition, the absorbent core 8c is reinforced in areas where pressure is likely to be applied when worn, thereby preventing deformation. The low basis weight part is provided in a portion that abuts on the wearer's buttocks when worn, and easily follows the wearer's body surface.

The absorbent core 8c is flat on the wearer's skin side, and the high basis weight portion is formed by increasing the basis weight on the non-skin side. Moreover, the high basis weight part extends with the same width from the ventral end to the dorsal end of the absorbent core 8c. The high basis weight portion extends with the same basis weight over the entire extension portion. By forming the high basis weight part and the low basis weight part in this way, it is possible to suppress the appearance of a step due to the boundary between the high basis weight part and the low basis weight part on the skin surface side, and to prevent the level difference from giving discomfort to the wearer. be able to. The absorbent core 8c having such characteristics can be realized by laminating, for example, the hourglass-shaped upper absorbent mat 8a and the strip-shaped lower absorbent mat 8b having a width equal to or smaller than the constricted portion.

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 the “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). In FIG. 5, the high basis weight area 24 is surrounded by a dotted line. 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.

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.

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 that overlaps 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, 4R3 pulls the side flaps 41L, 41R in the direction of contraction (outside in the width direction), thereby facilitating the erection of the side flaps 41L, 41R. That is, even when the absorbent core 8c has a constriction and the wide portion 88A is present, the side flaps 41L and 41R are erected following the erection 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 and 41R will be prevented from rising following the rising of the side seats 10L and 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, according to the diaper 1 as described above, in the side flaps 41L and 41R positioned on the widthwise outer side of the widened portion 88C of the absorbent core 8c, the widthwise inner tips of the rubber threads 4F3 and 4R3 overlap the absorbent core 8c. not (see Figure 3). Therefore, bending of the absorbent core 8c due to contraction of the rubber threads 4F3 and 4R3 is suppressed. Therefore, the side flaps 41L and 41R can be easily erected using the widthwise end of the narrowest portion 88B as a base point for bending. Therefore, the height of the three-dimensional gathers 3BL and 3BR to be formed increases. Therefore, the effect of preventing leakage of the discharged substances existing on the top sheet 9 is improved.

As shown in FIG. 6, the rubber thread 10L1 on the side of the free end portion 3BL4 overlaps the second adhesive portion 36 when the diaper 1 is viewed in the thickness direction. The diaper 1 according to the present embodiment has this configuration, so that only the free end portion 3BL4 of the free end side piece 3BL3 of the three-dimensional gathers 3BL rises to the outside in the width direction of the diaper 1 (left side in FIG. 6). This prevents the free end side piece 3BL3 from coming into surface contact with the wearer's skin, that is, only the free end 3BL4 coming into contact with the wearer's skin. If only the free end portion 3BL4 contacts the skin, it becomes difficult for the three-dimensional gathers 3BL to suppress liquid leakage. In the diaper 1 according to the present embodiment, by bringing the free end side pieces 3BL3 into contact with the skin, it is possible to prevent gaps from forming between the wearer's skin and the three-dimensional gathers 3BL, thereby suppressing leakage of excrement. . The same applies to the three-dimensional gathers 3BR.

<Modification 1>
Next, the diaper 1 according to Modification 1 of the present embodiment will be described. FIG. 7 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 adhesive portions 35 are formed apart from each other, and the plurality of first adhesive 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. 8 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, an absorbent article according to Modification 3 of the present embodiment will be described. FIG. 9 is a sectional view of a cross section including the top sheet 9 and the side sheet 10L when cut along line AA in FIG. In this modification, the three-dimensional gathers 3BL will be described with reference to FIG. 9, but the same applies to the three-dimensional gathers 3BR.

As shown in FIG. 9, regarding the rubber thread (rubber thread 10L1 shown in FIG. 6) provided in the three-dimensional gather 3BL, the rubber thread 10L11 is disposed on the side of the folded portion 3BL2, and the rubber thread 10L11 is disposed on the side of the free end portion 3BL4. The rubber thread provided between the rubber thread 10L11 and the rubber thread 10L13 is referred to as a rubber thread 10L12. The rubber thread 10L11 has a higher draft rate (%) than the rubber threads 10L12 and 10L13. Here, the draft rate is a percentage value obtained by dividing the length of the rubber thread in the stretched state by the natural length of the rubber thread. , the draft rate is 200%. In this modification, by setting the draft rate of the rubber thread 10L11 on the side of the folded portion 3BL2 higher than the draft rate of the rubber threads 10L12 and 10L13 on the side of the free end portion 3BL4, the three-dimensional gathers 3BL are raised from the side of the folded portion 3BL2. By suppressing the rise of only the free end portion 3BL4 and bringing the free end side piece 3BL3 into close contact with the wearer's skin, leakage of discharge from the gap between the wearer's skin and the three-dimensional gathers is prevented. can be suppressed.

<Modification 4>
Next, an absorbent article according to Modification 4 of the present embodiment will be described. FIG. 10 is a diagram schematically showing the cross-sectional structure of the diaper 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 is sandwiched between the wearer's legs, a compressive pressure is applied to the inside in the width direction. On the other hand, in the front body region and the back body region, 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 adhesive 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.

Further, the absorbent core 8c has a constriction in the crotch region 1B, and the upper absorbent mat 8a and the lower absorbent mat 8b are laminated to form a high basis weight portion of the absorbent core 8c in the crotch region 1B. In addition, since the width of the lower absorbent mat 8b is substantially constant, the central portions in the width direction of the front body region 1F and the back body region 1R have a high basis weight. Then, in the front body region 1F and the back body region 1R, the widthwise outer side of the lower absorbent mat 8b, that is, the region where only the upper absorbent mat 8a exists becomes a low basis weight portion. The high basis weight part extends to a portion corresponding to the wearer's excretion hole and absorbs discharged liquid. In addition, the absorbent core 8c is reinforced in areas where pressure is likely to be applied when worn, thereby preventing deformation. The low basis weight part is provided in a portion that abuts on the wearer's buttocks when worn, and easily follows the wearer's body surface.

The absorbent core 8c is flat on the wearer's skin side, and the high basis weight portion is formed by increasing the basis weight on the non-skin side. Moreover, the high basis weight part extends with the same width from the ventral end to the dorsal end of the absorbent core 8c. The high basis weight portion extends with the same basis weight over the entire extension portion. By forming the high basis weight part and the low basis weight part in this way, it is possible to suppress the appearance of a step due to the boundary between the high basis weight part and the low basis weight part on the skin surface side, and to prevent the level difference from giving discomfort to the wearer. be able to. The absorbent core 8c having such characteristics can be realized by laminating, for example, the hourglass-shaped upper absorbent mat 8a and the strip-shaped lower absorbent mat 8b having a width equal to or smaller than the constricted portion.

<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. Also, the thread rubbers 4F2 and 4R2 do not have to overlap the absorbent core 8c. Further, the upper absorbent mat 8a does not have to be hourglass shaped, and the rubber threads 4F3 and 4R3 do not have to be provided outside the widened portion 88C in the width direction and inside the widened portion 88A in the longitudinal direction. Further, the rubber thread 10L1 does not have to be provided on the inner side in the width direction of the first bonding portion 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 .

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: trunk 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 sheet 10L, 10R: Side sheet 10L1, 10R1: Rubber thread 10L2, R2: Folding line 11F, 11R: End sheet 22L, 22R: Low basis weight area 24 : High weight areas 30L, 30R : Non-permeable portion

35: first bonding portion 36: second bonding portion 41L, 41R: side flap 88A: wide portion 88B: narrowest portion 88C: widened portion

Claims (12)

An absorbent article having a length along a longitudinal direction and a length along a width direction orthogonal to the longitudinal direction,
an absorbent core capable of absorbing the wearer's exudates;
a top sheet provided on the skin surface side of the absorbent core;
a leak-proof wall provided along the longitudinal direction on the skin surface side of the top sheet;
a pair of erecting lines provided along the longitudinal direction on the skin surface side of the top sheet for erecting the leak-proof walls on the skin surface side;
a first stretchable member provided on the leak-proof wall so as to be stretchable in the longitudinal direction;
The leak-proof wall has a base end provided on the standing line, a free end provided along the longitudinal direction at an end on the side of the skin surface opposite to the base end, and the base end. a fold line provided between the free end and extending in the longitudinal direction;
A first region of the leak-proof wall between the standing line and the folding line is superimposed on the top sheet on the inner side of the standing line in the width direction, and the top sheet other than the standing line or the base end portion is overlapped with the top sheet. A first non-adhesive region that is not adhered to the sheet, and a first adhesive portion that is adhered to the top sheet from the base end portion to the outside of the fold line in the width direction at the end portion in the longitudinal direction. and
A second region of the leak-proof wall between the fold line and the free end is folded back along the fold line so as to be laminated on the skin surface side of the first region, and the first region is the fold. A second non-bonded region that is non-bonded in a region other than the region where the line is provided, and at least the free end is bonded to the first region at the end in the longitudinal direction where the first bonded portion is provided. and a second adhesive portion,
The first elastic member is provided at least on the folding line side of the center portion in the width direction in at least the folding line or the second region, and on the free end side or the free end side of the center portion. to be
absorbent article. The absorbent core has, at least at the ends in the longitudinal direction, bending portions for facilitating bending of the ends in the width direction toward the skin surface with respect to the center portion in the width direction,
The longitudinal ends of the leak-proof wall are laminated on the top sheet in a region overlapping the absorbent core on the widthwise end side with respect to the folded 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 leak-proof wall are laminated to the top sheet in a region overlapping with the low-rigidity portion.
The absorbent article according to claim 2. A second stretchable member that stretches in the width direction is laminated at the end of the absorbent core in the longitudinal direction,
4. The absorbent article according to any one of claims 1-3. 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
A third elastic member that expands and contracts in the width direction is laminated outside the widened portion in the width direction and inside the wide portion in the longitudinal direction,
4. The absorbent article according to any one of claims 1-3. The first elastic member is provided so as to overlap with the outermost portion in the width direction of the first non-bonded region inside the first bonding portion in the width direction,
4. The absorbent article according to any one of claims 1-3. The second bonding portion extends further inward than the first bonding portion in the longitudinal direction,
4. The absorbent article according to any one of claims 1-3. The second bonding portion is formed in a linear region in the second region on the free end side,
4. The absorbent article according to any one of claims 1-3. In the first non-adhesive region on the folding line side of the first adhesive portion, the longitudinal endmost portion of the leak-proof wall is adhered to the top sheet,
4. The absorbent article according to any one of claims 1-3. Further comprising an end sheet laminated closer to the skin surface than the leak-proof wall at the extreme end,
The absorbent article according to claim 9. A plurality of the first elastic members are arranged between the folding line and the free end,
The first elastic member on the free end side overlaps the second adhesive portion when viewed in the thickness direction,
4. The absorbent article according to any one of claims 1-3. A plurality of the first elastic members are arranged between the folding line and the free end,
The first elastic member on the fold line side has a higher draft rate than the first elastic member on the free end side,
4. The absorbent article according to any one of claims 1-3.

Images