JP6072175B1 - Absorbent articles - Google Patents

Abstract

[PROBLEMS] To provide an absorbent article that does not require reworking of a worn state, fits into a crotch portion of a wearer with a simple mounting operation, and can exhibit a high leakage prevention effect. A pair of ventral flaps 10 is fixed to both side edges 5S of the absorbent main body 5 in the ventral side 1F. The absorbent core 40 includes a wide portion 40W having a relatively long length in the lateral direction Y, a narrow portion 40N having a relatively short length, and an intermediate width portion 40M positioned therebetween. The both side edge portions 40MS of the intermediate width portion 40M are skewed in plan view. The ventral flap fixing point 11α is located on or near the virtual straight line VL and inward in the vertical direction X from the virtual straight line VL. The side edge portion 40MS of the intermediate width portion 40M is located in the vicinity of the virtual straight line VL and is skewed along the virtual straight line VL. The ventral longitudinal end 53F of the leg gather forming elastic member 53 is located in the vicinity of the virtual straight line VL. [Selection] Figure 6

Description

  The present invention relates to an absorbent article such as a disposable diaper, and particularly to a deployable absorbent article provided with a fastening member.

  As a typical form of the absorbent article, the absorbent article has an abdominal part arranged on the abdomen side of the wearer, a dorsal part arranged on the dorsal side, and a crotch part located therebetween, and is liquid-permeable. Examples include a top sheet, a liquid-impermeable back sheet, and an absorbent core disposed between both sheets. In addition, as a disposable diaper that is a kind of absorbent article, stretchable side panels that expand and contract in the lateral direction on both side edges of the back side of the absorbent main body including the absorbent core are laterally extended from the side edges. A deployable disposable diaper is known that is attached so as to extend outward, and is further provided with a fastening tape for fastening to be used when a diaper is attached to the front end of each side panel in the extending direction. (For example, Patent Documents 1 and 2).

  In the deployable disposable diaper described in Patent Documents 1 and 2, a pair of ventral flaps made of a panel material extend laterally outward from the side edges on both side edges of the abdominal side of the absorbent main body. It is attached to do. This ventral flap may be used when wearing a diaper. That is, when wearing a deployable disposable diaper having a pair of abdominal flaps attached to both side edges of the abdominal side, typically one hand grasps one of the pair of abdominal flaps. In addition, while holding the back side of the diaper with the other hand, place the diaper below the crotch of the wearer, and from that state, lift the gripped part to the crotch and wear it. Attach the corresponding parts of the raised diaper to each part of the waist and crotch of the wearer, and stretch the fastening tape on the back side to the wearer's abdomen to stop it on the adherent area on the outer surface of the abdomen. To wear.

JP 2014-90902 A JP 2014-144050 A

  As described above, the abdominal flap attached to the ventral side of the deployable disposable diaper functions as a gripping part when wearing the diaper and is very convenient, but a part for gripping the ventral flap, etc. Depending on the method of use, wrinkles may occur in the diaper, the diaper may not follow the wearer's body, a gap may be formed, and the absorbent body may be kinked. When the diaper is worn on the body in such an unfavorable state, the diaper is not fitted to the body, and therefore excretion fluid such as urine may leak to the outside.

  Therefore, the present invention relates to providing an absorbent article that does not require reworking of the wearing state, fits into the crotch portion of the wearer with a simple mounting operation, and can exhibit a high leakage prevention effect.

The present invention has a longitudinal direction extending from the abdomen side of the wearer to the back side through the crotch part and a lateral direction perpendicular thereto, and a crotch part arranged in the crotch part when worn, The abdominal side part arranged on the abdomen side of the wearer and the back side part arranged on the back side of the wearer from the crotch part in the longitudinal direction, including an absorbent core, A rectangular absorbent main body that is long in the longitudinal direction when viewed, a pair of fastening members fixed to both side edges along the longitudinal direction of the absorbent main body in the back side portion, and the abdominal side portion An absorbent article fixed to both side edges along the longitudinal direction of the absorbent main body so that a pair of ventral flaps extend laterally outward from the both side edges, wherein the absorbent main body includes: From the ventral side to the dorsal side, laterally outward from both side edges along the longitudinal direction of the absorbent core Each of the pair of side flaps, and a leg gather forming elastic member is arranged in an extended state so as to extend vertically through the crotch part, The absorbent core includes a wide portion having a relatively long lateral length, a narrow portion having a relatively short lateral length, and an intermediate width portion positioned between the wide portion and the narrow portion. In the vertical direction, at least part of the wide part is located on the abdominal side part, at least part of the narrow part is located on the crotch part, and both side edges of the intermediate width part Are inclined in a plan view, and each of the pair of ventral flaps protrudes laterally outward from a part of the side edge along the longitudinal direction of the extending portion from the side edge of the absorbent main body. In the case where the absorbent main body is expanded in a flat shape to be in a developed state. A portion located in the longitudinally innermost side and laterally outermost side in the fixing portion of the ventral flap with the absorbent main body is defined as a ventral flap fixing point, and the central point of the absorbent main body and the center of the convex portion The present invention provides an absorbent article that satisfies all of the following (1) to (3) when a virtual straight line passing through a point is drawn.
(1) The ventral flap fixing point is located on the virtual straight line or in the vicinity of the virtual straight line and inward in the vertical direction from the virtual straight line.
(2) The side edge portion of the intermediate width portion is located in the vicinity of the virtual line and is skewed along the virtual line.
(3) The ventral vertical end of the leg gather forming elastic member is positioned in the vicinity of the virtual straight line.

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which fits a wearer's crotch part by simple mounting operation, and can show the high leak prevention effect is provided without the rework of a wearing state.

FIG. 1 is a surface sheet side showing a developed state in which a disposable diaper as an embodiment of the absorbent article of the present invention is expanded in a flat shape by extending elastic members of respective parts of an absorbent main body, that is, a skin facing surface side. FIG. FIG. 2 is a schematic cross-sectional view taken along the line II of FIG. 1 (placement portion of the ventral flap on the ventral side). FIG. 3 is a schematic cross-sectional view taken along the line II-II (the crotch part) of FIG. FIG. 4 is a schematic cross-sectional view taken along the line III-III in FIG. 1 (placement portion of the fastening member on the back side portion). FIG. 5 is a schematic plan view of the absorbent core in the diaper shown in FIG. FIG. 6 is an enlarged view of a part of FIG. 1, and is a schematic plan view of the ventral side portion of the diaper shown in FIG. 1 and the vicinity thereof. FIG. 7 is an explanatory view of the “fixing portion of the abdominal flap with the absorbent main body” according to the present invention. FIG. 8 is a plan view schematically showing a ventral flap and its vicinity in a diaper outside the scope of the present invention, and FIG. 8 (a) shows a natural state before the ventral flap is pulled in the direction indicated by the arrow. FIG. 8B shows a state when the ventral flap is pulled in the direction indicated by the arrow.

  Hereinafter, the absorbent article of the present invention will be described based on a disposable diaper which is a preferred embodiment thereof with reference to the drawings. As shown in FIG. 1, the disposable diaper 1 of the present embodiment has a longitudinal direction X extending from the wearer's abdomen to the back via the crotch portion and a lateral direction Y orthogonal thereto, and when worn, A crotch part 1M arranged in the crotch part, an abdomen part 1F arranged on the abdomen side of the wearer than the crotch part 1M, and a back side part 1R arranged on the dorsal side of the wearer than the crotch part 1M; In the longitudinal direction X. The crotch part 1M includes an excretion part facing part (not shown) that is disposed to face the excretion part of the wearer such as a penis when worn. The excretory part opposing part is normally in a position biased slightly closer to the ventral part 1F than the center of the diaper 1 in the longitudinal direction X. The abdominal side portion 1F, the crotch portion 1M, and the dorsal side portion 1R correspond to respective regions when the diaper 1 (absorbent body 5) is divided so as to be divided into approximately three equal parts in the vertical direction X.

  The diaper 1 is a so-called unfolded panel-type disposable diaper, which is a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and a liquid-retaining property disposed between both sheets 2 and 3. A pair of fastening members 8, 8 fixed to both side edges 5S, 5S along the longitudinal direction X of the absorbent main body 5 in the back side portion 1R, and the ventral side A pair of ventral flaps 10 and 10 fixed to 5S and 5S are provided on both side edges of the absorbent main body 5 in the portion 1F. The diaper 1 is formed symmetrically with respect to a longitudinal center line CLx that bisects the absorbent main body 5 in the transverse direction Y and extends in the longitudinal direction X. The absorptive main body 5 has a rectangular shape that is long in the longitudinal direction X in plan view as shown in FIG. The fastening member 8 and the ventral flap 10 are fixed to the absorbent main body 5 so as to extend outward in the lateral direction Y from the side edge 5S of the absorbent main body 5, respectively.

  Each of the top sheet 2 and the back sheet 3 has a size larger than that of the absorber 4 and extends outward from the peripheral edge of the absorber 4, and the extending portions are adhesive, heat seal, ultrasonic They are joined together by a known joining means such as a seal. As the top sheet 2 and the back sheet 3, various types conventionally used for this type of absorbent article can be used without particular limitation. For example, various nonwoven fabrics or apertured films can be used as the top sheet 2, and a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used as the back sheet 3. The back sheet 3 has, for example, a liquid-impermeable film sheet alone and a non-skin facing surface of the film sheet, that is, a form in which an exterior sheet is laminated on the outer surface side. It is a nonwoven fabric.

  The absorbent body 4 includes a liquid-retaining absorbent core 40, a skin-side core wrap sheet 41 that covers the skin facing surface of the absorbent core 40, and a non-skin that covers the non-skin facing surface of the absorbent core 40. The side core wrap sheet 42 is included. The absorbent core 40 has a single layer structure in which a core forming material including an absorbent material is stacked. As the absorbent material, those normally used as a material for forming this type of absorbent core can be used without any particular limitation. For example, hydrophilic fibers such as wood pulp, synthetic fibers treated with a hydrophilizing agent, and water absorption Include polymer particles. That is, the absorbent core 40 may be a hydrophilic fiber stack or a structure in which water-absorbing polymer particles are supported on the stack. As the core wrap sheets 41 and 42, for example, paper, nonwoven fabric, or the like can be used.

  The absorptive core 40 has an hourglass shape in which a central portion in the longitudinal direction X is inwardly bounded in a plan view as shown in FIG. 1, and has a long shape in the longitudinal direction X. The absorbent core 40 has a ventral vertical end 40F on the ventral side 1F and a back vertical end 40R on the dorsal side 1R, and extends over the entire length in the vertical direction X of the crotch 1M.

  In FIG. 5, an absorbent core 40 is shown. As shown in FIGS. 1 and 5, the absorbent core 40 includes a wide portion 40W having a relatively long length in the lateral direction Y, a narrow portion 40N having a relatively short length in the lateral direction Y, and a wide width. An intermediate width portion 40M located between the portion 40W and the narrow portion 40N is provided in the vertical direction X. Note that the “length in the horizontal direction Y” (that is, the width), which is an element that distinguishes these parts, is the maximum width when the width changes in the vertical direction X and is not constant. In the illustrated form, the wide portion 40W has a constant width over the entire length in the vertical direction X, whereas the narrow portion 40N and the intermediate width portion 40M have different widths in the vertical direction X, respectively. The side edges 40NS, 40NS of the narrow portion 40N and the side edges 40MS, 40MS of the intermediate width portion 40M are skewed in a plan view as shown in FIGS. And it extends in a direction that intersects both the lateral directions Y. And at least a part of the wide part 40W is located in the ventral part 1F, and at least a part of the narrow part 40N is located in the crotch part 1M. The intermediate width portion 40M is located on one of the wide portion 40W and the narrow portion 40N, or is located across both.

  As shown in FIGS. 2 to 4, the skin-side core wrap sheet 41 has substantially the same size as the skin-facing surface of the absorbent core 40, whereas the non-skin-side core wrap sheet 42 absorbs the skin. The length (that is, the width) in the lateral direction Y is greater than the non-skin facing surface of the conductive core 40. The wide non-skin side core wrap sheet 42 covers the whole area of the non-skin facing surface of the absorbent core 40 and extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent core 40. The extending portion is wound up on the skin-side core wrap sheet 41 disposed to face the skin-facing surface of the absorbent core 40, and covers both side edges along the longitudinal direction X of the skin-side core wrap sheet 41. Yes.

  In the present specification, the “skin-facing surface” is a surface of the absorbent article or a component thereof (for example, the absorbent main body 5) that is directed toward the wearer's skin when the absorbent article is worn, that is, relatively. The side close to the skin of the wearer, and the “non-skin facing surface” is the side opposite to the skin side when the absorbent article is worn, that is, relatively far from the wearer's skin. It is the surface that is directed to the side. Moreover, in this specification, "at the time of wearing" means the state where the normal appropriate wearing position, that is, the correct wearing position of the absorbent article is maintained, and the absorbent article is in a state of being deviated from the wearing position. Does not include cases.

  As shown in FIGS. 1-4, the side sheet | seat 51 is distribute | arranged to the left-right both sides along the vertical direction X in the surface sheet 2 side of the absorptive main body 5, respectively. The side seat 51 has an inner edge along the vertical direction X, and an outer edge along the vertical direction X located outside the inner edge in the lateral direction Y, as shown in FIG. In view, the inner edge of the side sheet 51 overlaps with the absorber 4, and the outer edge of the side sheet 51 extends outward from the side edge along the longitudinal direction X of the absorber 4 in the lateral direction Y, 3 is joined. An elastic member 52 for forming a thread-shaped three-dimensional gather is fixed to the inner edge of the side seat 51 in an elongated state along the longitudinal direction X. Accordingly, when the diaper 1 is worn, at least the crotch is caused by contraction of the elastic member 52. A solid gather is formed in the portion 1M.

  As shown in FIG. 1, the absorbent main body 5 extends outwardly in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4 (absorbent core 40) from the ventral side 1 </ b> F to the dorsal side 1 </ b> R. It has a pair of side flap parts 50 and 50 extending. As shown in FIGS. 2 to 4, the side flap portion 50 extends outward in the lateral direction Y from the side edge along the longitudinal direction X of the absorbent body 4 in each of the top sheet 2, the back sheet 3 and the side sheet 51. The sheet 2, 3, 51 is joined to each other by a known joining means such as an adhesive, heat seal, ultrasonic seal or the like. Both side edge portions 5S, 5S along the longitudinal direction X of the absorbent main body 5 are formed of side flap portions 50.

  As shown in FIGS. 1 and 3, each of the pair of side flap portions 50, 50 is provided with a thread-like leg gather forming elastic member 53 extending in the longitudinal direction X through the crotch 1 </ b> M. Has been. The side flap part 50 in the crotch part 1M is a part functioning as a so-called leg part arranged around the wearer's leg when the diaper 1 is worn. With this configuration, the leg part has a portion when the diaper 1 is worn. A pair of leg gathers is formed by the contraction of the elastic member 53.

  As shown in FIGS. 1 and 4, the pair of fastening members 8, 8 are fixed to the absorbent main body 5 so as to extend outward in the lateral direction Y from the side edge portion 5 </ b> S of the absorbent main body 5. A stretchable side panel 6 and a fastening tape 7 fixed to the side panel 6 so as to extend outward in the lateral direction Y from the front end portion 6S of the side panel 6 in the extending direction. Has been. The fastening member 8 (side panel 6, fastening tape 7) is a separate member from the absorbent main body 5.

  As shown in FIGS. 1 and 4, the side panel 6 is fixed in a stretched state between two panel members 61, 61 having a square shape in plan view, and the two panel members 61, 61, and in the lateral direction Y. And a plurality of elastic members 62 extending. The plurality of elastic members 62 are arranged at predetermined intervals in the vertical direction X at the central portion in the horizontal direction Y of the side panel 6. The arrangement part (central part of the horizontal direction Y) of the elastic member 62 in the side panel 6 is an expansion / contraction part that can expand and contract in the horizontal direction Y that is the extension direction of the elastic member 62, and the side panel 6 can be expanded and contracted by such an expansion / contraction part. It has elasticity in the lateral direction Y. Of the side edges along the vertical direction X of the side panel 6, the side edge 51 and the back surface of the side edge 5S (side flap part 50) of the absorbent main body 5 are the inner edges relatively close to the vertical center line CLx. It is fixed to the sheet 3 by a known joining means such as an adhesive to form a fixing portion of the side panel 6 with the absorbent main body 5 and is an outer edge or extension relatively far from the longitudinal center line CLx. The direction front end 6 </ b> S side is located outward in the lateral direction Y from the side edge 5 </ b> S of the absorbent main body 5.

  As shown in FIGS. 1 and 4, the fastening tape 7 includes a tape base 71 and a fastening portion 72. The tape base 71 has a rectangular shape in a plan view as shown in FIG. 1, and one end side in the longitudinal direction (lateral direction Y) is a well-known adhesive such as an adhesive on the non-skin facing surface of the front end portion 6S of the side panel 6. The fastening part with the side panel 6 of the fastening tape 7 is formed by being fixed by the joining means. A fastening portion 72 is fixed to the inner surface (skin facing surface) of the portion extending in the lateral direction Y from the front end portion 6S of the side panel 6 in the tape substrate 71. The fastening portion 72 is made of a male member of a mechanical hook-and-loop fastener, and can be detachably fastened to a to-be-attached region 9 made of a female member of a mechanical hook-and-loop fastener, which will be described later.

  As the panel material 61 constituting the side panel 6, for example, air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, melt-blown nonwoven fabric, various nonwoven fabrics, woven fabric, knitted fabric, paper, resin film, etc. , And a sheet material obtained by laminating and integrating these two or more can be used. Moreover, as the tape base material 71 which comprises the fastening tape 7, a laminated body of a nonwoven fabric, a nonwoven fabric, and a resin film etc. can be used, for example.

  As shown in FIG. 1, a non-skin facing surface of the absorbent main body 5 in the ventral side portion 1 </ b> F is formed with a fastening region 9 made of a female member of a mechanical surface fastener. The to-be-attached region 9 is fixed to the non-skin facing surface (outer surface) of the back sheet 3 that forms the non-skin facing surface of the absorbent main body 5 by a known joining means such as an adhesive. The fastening portion 72 of the fastening tape 7 formed of a male member of a mechanical surface fastener can be detachably fastened.

  The pair of ventral flaps 10, 10 has an absorbent main body, as shown in FIGS. 1 and 2, of the both side edges along the vertical direction X, the inner edge side relatively close to the vertical center line CLx. 5 is fixed between the side sheet 51 and the back sheet 3 at the side edge portion 5S (side flap portion 50) by a known joining means such as an adhesive, and the fixing portion of the ventral flap 10 to the absorbent main body 5 11 is formed, and the outer edge side relatively far from the longitudinal center line CLx extends outward in the lateral direction Y from the side edge 5S of the absorbent main body 5. Each of the pair of ventral flaps 10 and 10 has a convex portion 12 in which a part of the side edge along the vertical direction X of the extended portion from the side edge portion 5S protrudes outward in the horizontal direction Y. have. The convex portion 12 has an isosceles trapezoidal shape in a plan view as shown in FIG. 1, and the length in the lateral direction Y, that is, the width gradually decreases toward the outside in the lateral direction Y. The ventral flap 10 is made of a sheet material such as a non-woven fabric that can be used as the panel material 61 constituting the side panel 6. Unlike the side panel 6, the ventral flap 10 is not stretched and is non-stretchable.

  In FIG. 6, an abdominal side 1 </ b> F that is a main part of the diaper 1 is shown enlarged. As one of the main features of the diaper 1 having the above-described configuration, as shown in FIG. 6, when the absorbent main body 5 is expanded in a flat shape to be in an unfolded state, the center point 5CP and convexity of the absorbent main body 5 are formed. When a virtual straight line VL passing through the center point 12CP of the part 12 is drawn, a point satisfying all of the following (1) to (3) is mentioned. In the following, one half on one side (the right half in FIG. 6) will be described with reference to the vertical center line CLx. However, unless otherwise specified, the description on one half is also applied to the other half. .

(1) The ventral flap fixing point 11α is located on the virtual straight line VL or in the vicinity of the virtual straight line VL and inward in the vertical direction X (that is, closer to the horizontal center line CLy) than the virtual straight line VL.
(2) The side edge portion 40MS of the intermediate width portion 40M of the absorbent core 40 is located in the vicinity of the virtual straight line VL and is skewed along the virtual straight line VL.
(3) The ventral longitudinal end 53F of the leg gather-forming elastic member 53 is located in the vicinity of the virtual straight line VL.

  As shown in FIG. 6, the “abdomen side flap fixing point 11α” refers to a fixing part 11 (absorbent body 5 via a bonding means such as an adhesive) with the abdominal side flap 10. In the joined portion), the innermost portion in the longitudinal direction X and the outermost portion in the lateral direction Y are located. That is, the abdominal flap fixing point 11α is a point located on the outermost side in the horizontal direction Y at the vertical end of the fixing portion 11 on the crotch 1M side. In addition, since the fixing | fixed part 11 in the form shown in FIG. 6 is the whole overlap part with the absorptive main body 5 in the abdominal side flap 10, the abdominal side flap fixing | fixed point 11 (alpha) follows the longitudinal direction X of the absorptive main body 5. FIG. Although it is located on the side edge portion 5S, as shown in FIG. 7, for example, when the fixing portion 11 is inward in the lateral direction Y from the side edge portion 5S, the ventral flap fixing point 11α is on the side. It is located inward in the lateral direction Y from the edge 5S.

The “center point 5CP of the absorbent main body 5” is divided into the vertical center line CLx extending in the vertical direction X by dividing the absorbent main body 5 in the horizontal direction Y, and the horizontal center line CLx in the vertical direction X. This is the intersection with the horizontal center line CLy extending in the direction Y.
The “center point 12CP of the convex portion 12” is defined based on the same concept as the central point 5CP, that is, the vertical center line extending in the vertical direction X by dividing the convex portion 12 into the horizontal direction Y. (Not shown) is an intersection of the convex portion 12 and a horizontal center line (not shown) extending in the horizontal direction Y by dividing the convex portion 12 in the vertical direction X.
In addition, the “expanded state of the absorbent main body 5” means a state in which the elastic main body 5 includes an elastic member (such as the elastic members 52 and 53) and the absorbent main body 5 is expanded in a planar shape.

  The term “(1)“ in the vicinity of the virtual straight line VL and inward in the longitudinal direction X from the virtual straight line VL ”refers to the virtual straight line VL in the deployed state of the absorbent main body 5 (diaper 1) as shown in FIG. Inward in the vertical direction X (that is, on the side of the horizontal center line CLy), it means within 2% of the total length of the absorbent body 5 in the vertical direction X, and the ventral flap fixing point 11α is located in the region within 1%. It is preferable.

  The “near the virtual straight line VL” in (2) means that absorption is performed on one side and the other side in the longitudinal direction X from the virtual straight line VL in the developed state of the absorbent main body 5 (diaper 1) as shown in FIG. It means within 5% of the total length of the main body 5 in the longitudinal direction X, and it is preferable that the side edge portion 40MS of the intermediate width portion 40M is located within a region within 3%.

Further, “along the virtual straight line VL” in (2) means that the side edge portion 40MS of the intermediate width portion 40M is connected to the virtual straight line VL in the developed state of the absorbent main body 5 (diaper 1) as shown in FIG. More specifically, it means substantially parallel, and more specifically, the absolute value of the difference between the reference and the inclination angle of the side edge portion 40MS with reference to the inclination angle of the virtual straight line VL with respect to the vertical direction X or the horizontal direction Y. Means within 5 °, and preferably within 3 °.
Note that the side edge portion 40MS of the intermediate width portion 40M in the diaper 1 is a straight line in a plan view as shown in FIG. 6, but the present invention includes one in which the side edge portion 40MS is curved in a plan view. . When the side edge portion 40MS is a curve in plan view, the above (2) may be satisfied with respect to the “tangent” of the side edge portion 40MS of the curve.

  The “abdominal longitudinal end 53F of the elastic member 53” in (3) means the ventral longitudinal end of the elastic member 53 having stretchability. Does not necessarily match. That is, the “part having elasticity in the elastic member 53” is a part fixed to the side flap part 50 in an extended state, for example, a ventral end portion in the length direction of the elastic member 53 (that is, the length direction). If the ventral side end of the elastic member 53 is not stretchable, the ventral side longitudinal end 53F of the elastic member 53 is not stretched. "is not.

  Further, the “near the virtual straight line VL” in (3) means that the absorbent main body 5 (diaper 1) as shown in FIG. 6 is expanded from the virtual straight line VL to one side and the other side in the longitudinal direction X. In addition, it means a region within 2% of the total length in the longitudinal direction X of the absorbent main body 5, and it is preferable that the ventral side longitudinal end 53F of the elastic member 53 for leg gather formation is located within the region within 1%. .

  Since the diaper 1 satisfies all of the above (1) to (3), it is not necessary to rework the wearing state, fits to the wearer's crotch portion with a simple wearing operation, and has a high leakage prevention effect. The virtual straight line VL appearing in the above (1) to (3) is a typical example of the above-described “expandable disposable diaper in which a pair of ventral flaps are attached to both side edges of the ventral side” as in the diaper 1. In a simple mounting operation, it substantially matches the line of force when the ventral flap 10 is pulled.

  In particular, in the diaper 1 satisfying the above (1), as shown in FIG. 6, the ventral flap fixing point 11α is on the virtual straight line VL or in the vicinity of the virtual straight line VL and in the vertical direction X from the virtual straight line VL. Since it is located inside, when the convex part 12 of the abdominal flap 10 is gripped and pulled by fingers during the wearing process of the diaper 1, the abdominal flap 10 and its neighboring members are difficult to deform and are not intended. Wrinkles and folds are unlikely to occur. On the other hand, for example, as shown in FIG. 8A, the ventral flap fixing point 11α is located outward in the vertical direction X from the virtual straight line VL (that is, closer to the ventral vertical end 5F of the absorbent main body 5). When the convex portion 12 of the ventral flap 10 is grasped with a finger and pulled in the direction indicated by the arrow in FIG. 8A, the absorbent main body as shown in FIG. 5, the abdominal flap fixing point 11 α and the central point 12 CP of the convex portion 12 are positioned on the force line resulting from the pulling, that is, the virtual straight line VL, and the members in the vicinity thereof. Is deformed. As a result, for example, an uneven portion Z such as an unintended wrinkle or fold occurs in the vicinity of the ventral flap 10 at the ventral vertical end 5F of the absorbent main body 5. Such uneven | corrugated | grooved part Z can reduce the fit property of the diaper 1 with respect to a wearer's body in the wearing state of the diaper 1, and may cause a leak.

  Moreover, the diaper 1 satisfying the above (2) and (3), in the mounting process, grips the convex portion 12 of the abdominal flap 10 in the diaper 1 positioned below the wearer's crotch portion with fingers, and When it is lifted to the side, it can take a shape that naturally follows the wearer's body during the pulling, so combined with the effect of satisfying (1) above, Retouching is not required, and it can fit the wearer's crotch with a simple mounting operation.

  In particular, by satisfying the above (2), as shown in FIG. 6, the vertical direction X is greater than the side edge portion 40MS with the side edge portion 40MS (virtual straight line VL) of the intermediate width portion 40M of the absorbent core 40 as a boundary. "High-rigidity region 13" in which the outer side (abdominal side longitudinal direction end 5F side of the absorbent main body 5) is occupied by a relatively high-stiffness member such as the absorbent core 40 or the attachment region 9; The inner side of the longitudinal direction X (the lateral center line CLy side) from the side edge portion 40MS becomes the “low-rigidity region 14” in which the portion occupied by such a member having a high rigidity does not exist, and substantially, The high-rigidity region 13 exists on the outer side in the vertical direction X across the virtual straight line VL, and the low-rigidity region 14 exists on the inner side.

  And since the high rigidity area | region 13 does not generate | occur | produce a wrinkle, a bend | fold, etc. due to the height of the rigidity, the to-be-attached area | region 9 included in this has the same characteristic. Accordingly, in the process of attaching the diaper 1, it is difficult for wrinkles or floats to occur in the attachment region 9 to which the fastening tape 7 is attached, so that the fastening portion 72 of the fastening tape 7 is placed in the attachment region 9. The diaper 1 can be attached smoothly and without being bothered by the attachment operation. Moreover, since the said excretion part opposing part which is the site | part which is most easy to receive excretion fluids, such as urine by a wearer, is also contained in the highly rigid area | region 13 which is hard to generate | occur | produce a wrinkle and a break, according to the diaper 1, the said excretion The deterioration of the absorption performance due to the occurrence of wrinkles and creases at the part-opposing portion is effectively prevented, and high absorption performance is obtained.

  Further, the leg rigidity forming elastic member 53 is included in the low-rigidity region 14, and when the above-mentioned (3) is satisfied, the ventral longitudinal end 53F is a virtual straight line VL, that is, “when the ventral flap 10 is pulled. Therefore, when the abdomen flap 10 is pulled in the wearing operation of the diaper 1, the leg gathers are interlocked and naturally arranged on the buttocks around the wearer's leg. As a result, when the diaper 1 is worn, the pair of leg gathers in the crotch 1M rises toward the wearer's crotch, and the tips of the raised leg gathers (arrangement site of the elastic member 53) are the wearer. Since it fits along the buttocks, it will be in the state where it is hard to leak. Therefore, after wearing the diaper 1 according to a conventional method, it is not necessary to modify the wearing state.

If the side edge portion 40MS of the intermediate width portion 40M intersects the virtual straight line VL and the above (2) is not satisfied, the high-rigidity region 13 pulls the virtual straight line VL, that is, “the ventral flap 10 is pulled. Since it exists across the “line of force”, the operation of pulling the fastening tape 7 may be hindered.
Further, when the side edge portion 40MS of the intermediate width portion 40M is not located in the vicinity of the virtual straight line VL but is far away from the virtual straight line VL to the inner side in the vertical direction X (the horizontal center line CLy side). In addition to the fact that the operation of pulling the fastening tape 7 is hindered, the shrinkage of the leg gathering elastic member 53 may be hindered.
Further, the side edge portion 40MS of the intermediate width portion 40M is not positioned in the vicinity of the virtual straight line VL, and the outer side in the vertical direction X from the virtual straight line VL (the abdominal side vertical direction end 5F side of the absorbent main body 5). If they are far away from each other, wrinkles or folds may occur in the excretory part facing part or the adherent region 9.

  It fixes to the non-skin opposing surface (back sheet | seat 3) of the absorptive main body 5 in the abdominal side part 1F from a viewpoint of making it show more reliably the effect resulting from satisfy | filling said (1)-(3). 1 and 6 is fixed so as to overlap the wide portion 40W of the absorbent core 40, and the overlapping portion of the wide portion 40W with the adherent region 9 in a plan view as shown in FIGS. The lateral length W1 (see FIG. 1) is preferably longer than 80% of the lateral length (that is, the width) of the adherence region 9, and particularly 80 to 80% of the width of the adherence region 9. It is preferably in the range of 120%. The lateral length W1 means the maximum length (that is, the maximum width) at the overlapping portion. With such a configuration, the effects of the above (2) and (3) can be achieved more reliably, and the to-be-attached region 9 can be more easily along the wearer's body when the diaper 1 is worn.

  Further, the lateral length (ie, width) of the narrow portion 40N of the absorbent core 40 is preferably 25% or more, more preferably 30%, with respect to the lateral length (ie, width) of the absorbent body 5. Above, and preferably 50% or less, more preferably 45% or less, more specifically, preferably 25% or more and 50% or less, more preferably 30% or more and 45% or less. When such a ratio is too low, that is, when the narrow portion 40N is too thin with respect to the absorbent core 40, there is a risk of giving anxiety regarding the absorption performance to the user of the diaper 1, and conversely, such a ratio is too high. That is, if the narrow portion 40N is too thick with respect to the absorbent core 40, the action and effect of (3) may be hindered.

  Further, the lateral length W2 (see FIG. 1) of the convex portion 12 of the ventral flap 10 is preferably 10 mm or more, more preferably 12 mm or more, and preferably 20 mm or less, more preferably 18 mm or less, more specifically. Is preferably 10 mm or more and 20 mm or less, more preferably 12 mm or more and 18 mm or less. In order to ensure that the effects of (1) to (3) are achieved, it is necessary for the convex portion 12 to be gripped when the ventral flap 10 is pulled. It is effective to suggest to the user of the diaper 1 that the part 12 is a part that functions as a gripping part. From this point of view, the above-mentioned range is set so that the lateral length W2 of the convex portion 12 is set to the same length as that of a normal human thumb.

In particular, in order to achieve the effects of (2) and (3) more reliably, it is preferable that the absorbent core 40 has a certain degree of rigidity. The sex core 40 preferably includes pulp. As the pulp, those usually used for this type of absorbent core can be used without particular limitation, and examples thereof include wood pulp such as NBKP and LBKP; non-wood pulp such as cotton and hemp. The basis weight of the absorbent core 40 is preferably 250 g / m ² or more, more preferably 350 g / m ² or more, and preferably 600 g / m ² or less, more preferably 500 g / m ² or less, more specifically. Is preferably 250 g / m ² or more and 600 g / m ² or less, more preferably 350 g / m ² or more and 500 g / m ² or less. If the basis weight of the pulp in the absorbent core 40 is too large, the rigidity of the absorbent core 40 becomes too high, which may give the wearer an uncomfortable feeling or hinder the wearer's movement.

Although the present invention has been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate.
For example, in the diaper 1 of the above embodiment, the planar view shape of the convex portion 12 of the ventral flap 10 is an isosceles trapezoidal shape, but in the present invention, the planar view shape of the ventral flap is not particularly limited. A rectangular shape or the like may be used.
Further, the absorbent article of the present invention is not limited to the deployable disposable diaper as in the above-described embodiment, but is an article (deployment) used for absorbing bodily fluids (urine, menstrual blood, loose stool, sweat, etc.) discharged from the human body. For example, a diaper cover and a pad holder are also included.
The following additional notes are disclosed with respect to the embodiment of the present invention described above.

<1>
A longitudinal direction extending from the wearer's abdomen through the crotch portion to the back side and a transverse direction perpendicular thereto; and a crotch portion arranged in the crotch portion when worn; Having a ventral side portion arranged on the ventral side and a dorsal side portion arranged on the back side of the wearer from the crotch portion in the longitudinal direction;
An absorptive core is comprised, it comprises a rectangular-shaped absorptive main part prolonged in the direction of a plane in plane view, and a pair of fastening members are provided in the both sides along the longitudinal direction of the absorptive main part in the back side part. An absorbent article that is fixed and fixed to both side edges along the longitudinal direction of the absorbent main body at the ventral side so that a pair of ventral flaps extend laterally outward from the both side edges. Because
The absorbent main body has a pair of side flap portions extending laterally outward from both side edges along the longitudinal direction of the absorbent core from the ventral side portion to the dorsal side portion, In each side flap part, an elastic member for leg gather formation is arranged in an extended state so as to extend in the vertical direction through the crotch part,
The absorbent core includes a wide portion having a relatively long lateral length, a narrow portion having a relatively short lateral length, and an intermediate width portion positioned between the wide portion and the narrow portion. In the vertical direction, at least part of the wide part is located on the abdominal side part, at least part of the narrow part is located on the crotch part, and both side edges of the intermediate width part Is skewed in plan view,
Each of the pair of ventral flaps has a convex part, each of which extends in a laterally outward direction from a part of the side edge along the vertical direction in the extending part from the side edge part of the absorbent main body,
In the case where the absorbent main body is expanded into a flat shape and in an expanded state,
A portion located at the innermost side in the vertical direction and the outermost side in the lateral direction in the fixing portion of the ventral flap with the absorbent main body is defined as a ventral flap fixing point, and the center point of the absorbent main body and the convex portion An absorbent article that satisfies all of the following (1) to (3) when a virtual straight line passing through the center point is drawn.
(1) The ventral flap fixing point is located on the virtual straight line or in the vicinity of the virtual straight line and inward in the vertical direction from the virtual straight line.
(2) The side edge portion of the intermediate width portion is located in the vicinity of the virtual line and is skewed along the virtual line.
(3) The ventral vertical end of the leg gather forming elastic member is positioned in the vicinity of the virtual straight line.

<2>
The non-skin facing surface of the abdominal side part is arranged so that the to-be-attached region to which the fastening member is fastened is overlapped with the wide part of the absorbent core in plan view,
The lateral length of the overlapping portion of the wide portion with the adherent region is longer than 80% of the lateral length of the adherent region, preferably the lateral length of the adherent region. The absorptive article given in the above <1> in the range of 80-120% to a.
<3>
The absorbent article according to <1> or <2>, wherein a lateral length of the narrow portion of the absorbent core is 25% or more and 50% or less of a lateral length of the absorbent main body.
<4>
The absorbent article according to any one of <1> to <3>, wherein a lateral length of the convex portion of the ventral flap is 10 mm or more and 20 mm or less.
<5>
The absorbent core comprises pulp, and the basis weight of the absorbent core is preferably 250 g / m ² or more, more preferably 350 g / m ² or more, and preferably 600 g / m ² or less, more preferably The absorbent article according to any one of <1> to <4>, wherein is 500 g / m ² or less.

<6>
The absorptivity according to any one of <1> to <5>, wherein the convex portion has an isosceles trapezoidal shape in plan view, and the lateral length gradually decreases toward the laterally outward direction. Goods.
<7>
(1) in the vicinity of the imaginary straight line and inward in the longitudinal direction from the imaginary straight line in the developed state of the absorbent main body in the longitudinal direction of the absorbent main body in the longitudinal direction from the virtual straight line. The absorbent article according to any one of <1> to <6>, wherein the abdomen flap fixing point is located within 2% of the total length, and preferably within a region within 1%.
<8>
The vicinity of the virtual straight line of (2) is within 5% of the longitudinal total length of the absorbent main body on one side and the other side in the vertical direction from the virtual straight line in the deployed state of the absorbent main body. Yes, Preferably, the absorbent article as described in any one of said <1>-<7> in which the said side edge part of the said intermediate width part is located in the area | region within 3%.
<9>
Along the imaginary straight line of (2) above, in the deployed state of the absorbent main body, with reference to the inclination angle of the imaginary straight line with respect to the vertical or horizontal direction, the reference and the side edge of the intermediate width portion The absorptive article according to any one of <1> to <8>, wherein an absolute value of a difference from the same inclination angle of the part is within 5 °, preferably within 3 °.
<10>
The vicinity of the imaginary straight line in (3) is within 2% of the longitudinal length of the absorbent main body on one side and the other side in the vertical direction from the virtual straight line when the absorbent main body 5 is deployed. Preferably, the absorbent article according to any one of <1> to <9>, wherein the ventral longitudinal end of the leg gathering elastic member is located within a region of 1% or less. .

<11>
The absorbent article according to any one of <1> to <10>, wherein a high-rigidity region exists on the outer side in the longitudinal direction and a low-rigidity region exists on the inner side across the virtual straight line.
<12>
The lateral length of the narrow portion of the absorbent core is preferably 25% or more, more preferably 30% or more, and preferably 50% or less, with respect to the lateral length of the absorbent body. The absorbent article according to any one of <1> to <11>, more preferably 45% or less.
<13>
The lateral length of the convex part is preferably 10 mm or more, more preferably 12 mm or more, and preferably 20 mm or less, more preferably 18 mm or less, according to any one of <1> to <12>. Absorbent articles.
<14>
The absorbent article according to any one of <1> to <13>, wherein the absorbent core has a single-layer structure.
<15>
The said intermediate | middle width part is an absorbent article as described in any one of said <1>-<14> located in one of the said wide part and the said narrow part, or located over both.

<16>
The absorbent core has its skin facing surface covered with a skin-side core wrap sheet, and its non-skin facing surface is covered with a non-skin-side core wrap sheet,
The non-skin-side core wrap sheet covers the entire area of the non-skin facing surface of the absorbent core, and extends laterally outward from both side edges along the longitudinal direction of the absorbent core. <1> to <1>, which are wound up on the skin-side core wrap sheet disposed to face the skin-facing surface of the absorbent core and cover both side edges along the longitudinal direction of the skin-side core wrap sheet. The absorbent article as described in any one of 15>.
<17>
Side sheets are arranged on each of the left and right sides along the longitudinal direction on the skin facing surface side of the absorbent main body,
The side sheet has an inner edge along the vertical direction and an outer edge along the vertical direction located laterally outward from the inner edge, and the outer edge is the absorbent core. (Absorber comprising the absorbent core and a core wrap sheet covering the absorbent core) extending laterally outward from the side edge along the longitudinal direction of the absorbent body and facing the non-skin The absorbent article as described in any one of said <1>-<16> joined with the back surface sheet which forms a surface.
<18>
Each of the pair of fastening members includes a stretchable side panel fixed to the absorbent body so as to extend laterally outward from a side edge along the longitudinal direction of the absorbent body, and the side Any one of <1> to <17>, including a fastening tape fixed to the side panel so as to extend outward from the front end in the extending direction of the panel. The absorbent article as described.
<19>
The absorbent article according to <18>, wherein the fastening member is a separate member from the absorbent main body.
<20>
The side panel includes two panel members having a quadrangular shape in plan view, and a plurality of elastic members that are fixed in an extended state between the two panel members and extend in the lateral direction. > Or <19> The absorbent article.

1 disposable diaper (absorbent article)
1F Abdominal side 1M of absorbent article Crotch part 1R of absorbent article Back side 2 of absorbent article 2 Top sheet 3 Back sheet 4 Absorber 40 Absorbent core 40W Wide part 40N Narrow part 40M Middle width part 40MS Middle width Side edge portions 41, 42 Core wrap sheet 5 Absorbent body 5CP Center point 50 of absorbent body Side flap portion 51 Side sheet 52 Three-dimensional gather forming elastic member 53 Leg gather forming elastic member 53F Leg gather forming elastic member Abdomen longitudinal end 6 side panel 7 fastening tape 8 fastening member 9 to-be-attached region 10 abdomen flap 11 abdomen flap fixing part 11α abdomen flap fixing point 12 abdomen flap fixing point 12 convex part 12CP convex part Center point 13 High rigidity region 14 Low rigidity region VL Virtual straight line X Vertical direction Y Horizontal direction

Claims (5)

A longitudinal direction extending from the wearer's abdomen through the crotch portion to the back side and a transverse direction perpendicular thereto; and a crotch portion arranged in the crotch portion when worn; Having a ventral side portion arranged on the ventral side and a dorsal side portion arranged on the back side of the wearer from the crotch portion in the longitudinal direction;
An absorptive core is comprised, it comprises a rectangular-shaped absorptive main part prolonged in the direction of a plane in plane view, and a pair of fastening members are provided in the both sides along the longitudinal direction of the absorptive main part in the back side part. An absorbent article that is fixed and fixed to both side edges along the longitudinal direction of the absorbent main body at the ventral side so that a pair of ventral flaps extend laterally outward from the both side edges. Because
The absorbent main body has a pair of side flap portions extending laterally outward from both side edges along the longitudinal direction of the absorbent core from the ventral side portion to the dorsal side portion, In each side flap part, an elastic member for leg gather formation is arranged in an extended state so as to extend in the vertical direction through the crotch part,
The absorbent core includes a wide portion having a relatively long lateral length, a narrow portion having a relatively short lateral length, and an intermediate width portion positioned between the wide portion and the narrow portion. In the vertical direction, at least part of the wide part is located on the abdominal side part, at least part of the narrow part is located on the crotch part, and both side edges of the intermediate width part Is skewed in plan view,
Each of the pair of ventral flaps has a convex part, each of which extends in a laterally outward direction from a part of the side edge along the vertical direction in the extending part from the side edge part of the absorbent main body,
In the case where the absorbent main body is expanded into a flat shape and in an expanded state,
A portion located at the innermost side in the vertical direction and the outermost side in the lateral direction in the fixing portion of the ventral flap with the absorbent main body is defined as a ventral flap fixing point, and the center point of the absorbent main body and the convex portion An absorbent article that satisfies all of the following (1) to (3) when a virtual straight line passing through the center point is drawn.
(1) The ventral flap fixing point is located on the virtual straight line or in the vicinity of the virtual straight line and inward in the vertical direction from the virtual straight line.
(2) The side edge portion of the intermediate width portion is located in the vicinity of the virtual line and is skewed along the virtual line.
(3) The ventral vertical end of the leg gather forming elastic member is positioned in the vicinity of the virtual straight line. The non-skin facing surface of the abdominal side part is arranged so that the to-be-attached region to which the fastening member is fastened is overlapped with the wide part of the absorbent core in plan view,
2. The absorbent article according to claim 1, wherein a lateral length of an overlapping portion of the wide portion with the adherent region is longer than 80% of a lateral length of the adherent region.   The absorptive article according to claim 1 or 2 whose transverse direction length of said narrow part of said absorptive core is 25% or more and 50% or less of the transverse direction length of said absorptive main part.   The absorptive article according to any one of claims 1 to 3 whose transverse direction length of said convex part of said ventral side flap is 10 mm or more and 20 mm or less. The absorbent article according to any one of claims 1 to 4, wherein the absorbent core is configured to include pulp, and the basis weight of the absorbent core is 250 g / m ² or more.

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