JP5782251B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article with improved fit to a groove-like depression extending along the thigh root in the crotch.

  In conventional absorbent articles, it is common to ensure fit around the legs by so-called three-dimensional gathers to prevent leakage from around the legs.

  On the other hand, it is also known that there is a limit to the leakage prevention performance of the three-dimensional gather. To solve this, the width of the three-dimensional gather is narrowed and the absorber is passed through the lower side of the three-dimensional gather. There have been proposed ones that extend to the outside in the width direction and abut a portion located outside the three-dimensional gather in the absorbent body on the inside of the thigh (see Patent Documents 1 and 2).

JP 2004-049707 A JP 2004-049763 A

  However, in the above prior art, both the tip of the three-dimensional gather and the portion of the absorbent body located outside the three-dimensional gather are groove-shaped depressions extending along the thigh root between the crotch (hereinafter referred to as the thigh root of the crotch). (It is also referred to as a dent) and it becomes difficult or difficult to fit, and there is a problem that the base of the thigh is stiff and bulky.

  Then, the main subject of this invention is providing the absorbent article which improved the fitting property with respect to the thigh root hollow of a crotch.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
With a liquid-permeable top sheet, a liquid-impermeable back side sheet, and an absorber interposed between these sheets,
In the absorbent article provided with three-dimensional gathers extending along the front-rear direction from the front side of the crotch part to the rear side of the crotch part on both sides in the width direction,
In the developed state of the three-dimensional gather, the absorbent body has an overhanging portion projecting outward in the width direction from the front and rear sides of the crotch portion,
The three-dimensional gather extends at least from the back side of the overhanging portion of the absorbent body to the side of the absorbent sheet on the side part of the absorbent article having the three-dimensional gather. In addition, the portion located on the back side of the absorber has a root portion fixed to a member adjacent to the front side,
The front and rear ends of the portion of the three-dimensional gather that is closer to the tip than the base portion are non-stand-up portions that are fixed to members positioned inside thereof, and the intermediate portion between the non-stand-up portions is unfixed. And
In each of the portion located on the back side of the overhanging portion in the three-dimensional gather and the free portion, an elongated gather elastic elastic member is fixed in an extended state along the front-rear direction,
The portion having the protruding portion of the absorber together with the three-dimensional gather by the contraction force of the gather elastic elastic member is configured to rise with respect to the central portion in the width direction ,
The overhanging portion is configured such that the intermediate portion in the width direction bulges to the front side of both sides in the width direction, and the intermediate portion in the width direction of the overhanging portion is arranged in the width direction on the back side of the overhanging portion. The bulging elastic elastic member for bulging to the front side rather than both sides is fixed in a state of extending in the width direction ,
An absorbent article characterized by the above.

(Function and effect)
In the absorbent article according to the present invention, due to the contraction force of the gather elastic elastic member, the portion having the overhanging portion of the absorber together with the solid gather rises from the central portion in the width direction, and the stretch of the solid gather and the absorber Each tip of the protruding part fits into the thigh root recess between the crotch. Therefore, the fitting property with respect to the thigh root depression between the crotch is improved. Furthermore, since the overhanging portion of the absorbent body enters and fits into the thigh root recess between the crotch, it is difficult for this portion to be stiff or bulky. In addition, since the protruding portion of the absorber rises inside the three-dimensional gather, the excrement to get over the three-dimensional gather can be absorbed and held by the protruding portion of the absorber, so that so-called side leakage prevention performance is improved.
Further, in the present invention, the portion having the overhang portion of the absorbent body rises in a substantially U-shape, and the distal end portion thereof easily enters the thigh root depression between the crotch, and the compression / restoration property in the thickness direction is improved, It also has excellent follow-up to body movements. In particular, by providing the elastic expansion / contraction member for bulging, the desired bulging shape can be stably formed and maintained, and the above-described compression recovery property is further improved.

<Invention of Claim 2>
2. The absorption according to claim 1, wherein the absorbent body includes a main body portion and auxiliary portions having the projecting portions provided separately from the main body portion on both sides in the width direction of the main body portion. Sex goods.

(Function and effect)
When the protruding portion of the absorbent body is provided by an auxiliary portion that is separate from the main body portion, the auxiliary portion easily breaks with respect to the main body portion, so that the portion having the protruding portion of the absorbent body can easily stand up. Also, follow-up to body movement is improved.

<Invention of Claim 3 >
The overhang portion is divided into a width direction outer side portion and a width direction inner side portion, and a fold bulges to the front side with a crease between the width direction outer portion and the width direction inner portion. absorbent article by said width direction intermediate portion is configured so as to bulge to the front than its widthwise sides, according to claim 1, wherein the bent.

(Function and effect)
In this way, the overhanging part is divided into an outer part in the width direction and an inner part in the width direction and separated from each other, making it easy to bend with a crease between them, and stabilizing the expected bulge shape Can be formed and maintained.

<Invention of Claim 4 >
The overhanging portion is integrally provided with a widthwise outer portion and a widthwise inner portion having different thicknesses, and a fold is formed by using a step between the widthwise outer portion and the widthwise inner portion as a fold. The absorbent article according to claim 1 , wherein the absorbent article according to claim 1 is configured such that the intermediate portion in the width direction bulges to the front side of both sides in the width direction by being bent so as to bulge to the front side.

(Function and effect)
By providing the widthwise outer portion and the widthwise inner portion having different thicknesses in the integral overhanging portion in this way, the force concentrates on the step and can be easily folded using the step as a fold. The desired bulging shape can be stably formed and maintained.

<Invention of Claim 5 >
The overhanging portion is integrally provided with a widthwise outer portion and a widthwise inner portion, and a cut toward the boundary between the widthwise outer portion and the widthwise inner portion at at least one of the front and rear ends. The intermediate portion in the width direction is formed on both sides of the width direction by bending so that the crease bulges to the front side with the boundary between the outer portion in the width direction and the inner portion in the width direction as a crease. The absorbent article according to claim 1 , wherein the absorbent article is configured to bulge to the front side.

(Function and effect)
In this way, by forming a cut portion toward the boundary between the width direction outer portion and the width direction inner portion at at least one of the front and rear ends of the integral overhang portion, the force is concentrated on the tip of the cut portion. Then, it can be easily bent at the boundary between the outer portion in the width direction and the inner portion in the width direction, and the desired bulging shape can be stably formed and maintained.

<Invention of Claim 6 >
The absorbent article of which the part or the whole of the portion located on the back side of the overhang portion of the absorber is fixed to the member adjacent to the front, according to claim 1, wherein one of the standing gathers.

(Function and effect)
In this case, the unity between the three-dimensional gather and the overhanging portion of the absorber is improved, and both are likely to be in the expected standing state, and the three-dimensional gather is supported by the overhanging portion of the absorber at the crotch portion as a whole. Since it is difficult to collapse, so-called side leakage prevention performance is also improved.

<Invention of Claim 7 >
An exterior sheet having a front body and a back body, and an interior body fixed to the inner surface of the exterior sheet,
The interior body includes the liquid-permeable top sheet, the liquid-impermeable back side sheet, and the absorbent body interposed between these sheets, and on both sides in the width direction, crotch portions Each of the three-dimensional gathers extending along the front-rear direction from the front side to the rear side of the crotch part,
A pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed by joining the front body and the back body of the exterior sheet on both sides.
The absorbent article of any one of Claims 1-6 .

(Function and effect)
For example, a pants-type disposable diaper is intended for use by a wearer who does not have a thin thigh root, such as a person who changes the diaper himself, but who has a thin thigh root, However, there is no need for it. In addition, since users of pants-type disposable diapers often have relatively intense movements such as walking and exercise, it is an important problem that the thigh base is stiff and bulky. Therefore, the present invention, which is less stiff and bulky and has excellent fit to the thigh root recess between the crotch, is suitable for such a pants-type disposable diaper.

  As described above, according to the present invention, there are advantages such as improved fit to the thigh root depression between the crotch.

It is a top view (inner surface side) of the underpants type disposable diaper of a deployment state. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. It is a principal part top view of the underpants type disposable diaper of an unfolded state. It is CC sectional drawing of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is DD sectional drawing of FIG. It is sectional drawing in the state which expand | deployed the three-dimensional gather. It is a top view (inner surface side) of the interior body in a state where a three-dimensional gather is developed. It is a perspective view which shows the mounting state of a diaper. It is sectional drawing in a mounting state. It is sectional drawing in the state which expand | deployed the three-dimensional gather. It is a top view (inner surface side) of the interior body in a state where a three-dimensional gather is developed. It is a top view (inner surface side) of the interior body in a state where a three-dimensional gather is developed.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 to 7 show a pants-type disposable diaper 1. This pants-type disposable diaper 1 (hereinafter also simply referred to as diaper) has an exterior sheet 20 having a front body F and a back body B, and an interior body 10 fixed and integrated on the inner surface of the exterior sheet 20. The interior body 10 is formed by interposing an absorber 13 between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12. In manufacturing, after the back surface of the interior body 10 is fixed to the inner surface (upper surface) of the exterior sheet 20 by a joining means such as a hot melt adhesive G, the interior body 10 and the exterior sheet 20 are the front body F and the back body. The waist opening and a pair of left and right leg openings are formed by folding at the center in the longitudinal direction (front-rear direction), which is the boundary of B, and joining both sides thereof by heat welding or hot melt adhesive. A pants-type disposable diaper.

(External sheet structure example)
As shown in FIGS. 4 to 6, the exterior sheet 20 is a non-woven sheet having a two-layer structure including an upper layer nonwoven fabric 20A and a lower layer nonwoven fabric 20B (that is, the lower layer nonwoven fabric is the outermost nonwoven fabric in this embodiment). Various elastic members are disposed between the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B, and between the nonwoven fabrics of the folded portion 20C formed by folding the lower layer nonwoven fabric 20B to the inner surface side at the waist opening edge, thereby imparting elasticity. The planar shape has a pseudo hourglass shape as a whole by concave leg-around lines 29 formed to form leg openings on both sides of the middle.

  In the illustrated exterior sheet 20, as elastic members, waist elastic members 24, 24... Disposed in the vicinity of the waist opening 23 in the developed shape shown in FIGS. B has a plurality of waist elastic members 25, 25... Arranged at intervals in the vertical direction along the width direction, and the waist elastic member group 25 in each of the front body F and the back body B. .., 25..., 25... Part that overlaps both side parts of the interior body 10 while curving so as to go to the opposite body side toward the center in the width direction from the joint edge on both sides joining the front body F and the back body B And a plurality of curved elastic members 26, 28,... Arranged at intervals without crossing each other. In addition, in this exterior sheet 20, what is called a leg periphery elastic member substantially continuous along the leg periphery line 29 is not provided.

  The waist elastic members 24, 24... Are disposed in the vicinity of the waist opening edge in the range of the side joint edges 21 and 22 where the front body F and the back body B are joined, with a space in the vertical direction. A plurality of thread rubber-like elastic members for attaching a diaper to the body by applying an expansion / contraction force so as to tighten around the waist of the body. For the waist elastic member 24, rubber thread is used in the illustrated example. However, for example, a tape-like elastic member may be used. Further, the waist elastic members 24, 24... Shown in the figure are sandwiched between the nonwoven fabrics of the folded portions 20C of the lower layer nonwoven fabric 20B at the waist, but may be sandwiched between the upper nonwoven fabric 20A and the lower layer nonwoven fabric 20B. good.

  The waist elastic members 25, 25... Are elastic rubber members arranged along the width direction at intervals in the vertical direction over a range from the upper part to the lower part of the side joint edges 21, 22. It is an elastic member, and applies elastic force in the width direction to the waist portions of the front body F and the back body B, respectively, to bring the diaper into close contact with the body. The boundary between the waist elastic members 24, 24... And the waist elastic members 25, 25. For example, among the elastic members arranged in the width direction with an interval in the vertical direction on the front body F and the back body B, even if the number cannot be specified, several on the upper side function as the waist elastic members. The remaining elastic members only have to function as waist elastic members.

  In the back body B, the dorsal curved elastic members 26, 26... Arranged separately from the waist elastic members 25, 25... Have an acute angle crossing angle θ (hereinafter referred to as the vertical direction) with the vertical direction in the middle in the longitudinal direction. A predetermined curve in which the vertical crossing angle θ increases within a range of 0 ° to 90 ° from the minimum point toward the both sides in the width direction, and In a state where the diaper is unfolded, it is arranged along a predetermined curve having an intersecting portion 70 having a longitudinal crossing angle θ of 60 ° or less in a region overlapping with both side portions of the interior body. There may be one dorsal curved elastic member 26, but it is preferable that there are a plurality of dorsal curved elastic members 26. In the illustrated example, there are five elastic rubber-like elastic members, and these dorsal curved elastic members 26, 26. They are arranged at intervals without crossing. The dorsal curved elastic member groups 26, 26,... Are arranged so as to form a predetermined expansion / contraction zone, instead of arranging a few elastic expansion / contraction members at a close interval and substantially as one bundle. Three or more, preferably five or more are arranged with an interval of about 5 to 25 mm, preferably about 5 to 16 mm.

  In the front body F of the exterior sheet 20, the ventral curved elastic members 28, 28... Arranged separately from the waist elastic member groups 25, 25. Is a predetermined curve in which the longitudinal crossing angle θ increases within the range of 0 degrees to 90 degrees from the minimum point toward both sides in the width direction, and the diaper is unfolded In the region overlapping the both side portions of the interior body, the vertical crossing angle θ is arranged along a predetermined curve having a crossing portion 70 having a value of 60 ° or less. The ventral curved elastic members 28, 28... May be one, but preferably a plurality. The illustrated example is five thread-like elastic members, and these ventral curved elastic members 28, 28. They are arranged at intervals without crossing each other. The ventral curved elastic member groups 28, 28... Are also arranged so as to form a predetermined expansion / contraction zone, instead of arranging a few elastic expansion / contraction members at a close interval and substantially as one bundle. Three or more, preferably five or more are arranged with an interval of about 5 to 25 mm, preferably about 5 to 16 mm.

  In the illustrated example, the waist elastic members 25, 25... And the curved elastic members 26, 28... Arranged in the front body F and the back body B are not provided in a portion crossing the interior body 10. This portion is a non-stretchable region. Thus, the form which does not have or is not provided with the elastic member includes the form in which the elastic member is present, but also the form in which the elastic member is present but is finely cut to the extent that the contraction force does not act. For example, as the latter example, the waist elastic members 25, 25... And the curved elastic members 26... 28 are crossed from the side joint edge 22 on one side across the interior body 10 and on the other (opposite) side. After providing continuously to the joining edge 22, the general form which cut | disconnects part or all of the part which traverses the interior body 10, and makes it discontinuous is contained. By making the elastic member discontinuous at the portion overlapping the interior body 10, it is possible to further prevent the interior body (particularly, the absorbent body 13) from contracting in the width direction. Of course, the waist elastic members 25, 25... And the curved elastic members 26, 28... Can be continuously arranged across the interior body 10.

  The above-described exterior sheet 20 can be manufactured by, for example, techniques described in Japanese Patent Application Laid-Open No. 4-28363 and Japanese Patent Application Laid-Open No. 11-332913. Moreover, in order to cut | disconnect the curved elastic members 26 ... 28 on the interior body 10 and to make it discontinuous, it describes in Unexamined-Japanese-Patent No. 2002-35029, Unexamined-Japanese-Patent No. 2002-178428, and Unexamined-Japanese-Patent No. 2002-273808. The cutting method to be used is preferably employed.

  Unlike the illustrated example, the curved elastic member may be provided only on one of the front body F and the back body B. Further, when the curved elastic members 26, 28,... Are provided on both the front body F and the back body B, a part or all of the group of curved elastic members arranged on the front body F side and the back body B side are provided. Although a form (not shown) in which a part or all of the group of the curved elastic members B arranged can be adopted, the group of the curved elastic members 28 arranged on the front body F side as in the illustrated example, Further, a configuration in which the group of the curved elastic members B arranged on the back body B side is separated in the longitudinal direction at a position slightly deviated from the middle part in the front-rear direction, particularly the front body F without crossing each other, is preferable. The minimum vertical separation distance in the vertical separation range 90 is preferably about 5 to 20 mm, and a wide fixed region described later is preferably provided in this portion.

  Further, the curved elastic members 26, 28,... May not be entirely curved as in the illustrated example, and may partially have a linear portion.

(Fixing the interior and exterior sheets)
The interior body 10 and the exterior sheet 20 are fixed to each other with a characteristic structure. As shown in FIG. 3, when the diaper is unfolded, the intersecting portion 70 (enclosed by a two-dot chain line in FIG. 3) where the acute angle side crossing angle θ between the curved elastic members 26, 28,. The outer sheet 20 and the inner body 10 are not fixed in the vertical range (in the illustrated example, the entire vertical range) of 80% or more of the portion 80, 81, 82 other than this. The exterior sheet 20 and the interior body 10 are fixed by a joining means such as a hot melt adhesive. As a result, the contraction force of the curved elastic members 26, 28, ... is hardly or not applied to the side portion of the interior body 10, and as a result, the curved elastic members 26, 28 ... overlap with both side portions of the interior body 10. Also, the thickness and hardness of the diaper are approximately the same as the surroundings, and recumbency is less likely to occur on the inner surface of the interior body 10. In addition, as long as 80% or more of the vertical range of the intersecting portion 70 is a fixed portion, not only a form in which the entire portion is continuously fixed as in the illustrated example but also a portion of the intersecting portion is not fixed. It is also possible to fix it intermittently within the intersection.

  On the other hand, as described above, when the non-fixed region 71 is provided in the range including the intersecting portion 70, the fixed region between the exterior sheet 20 and the interior body 10 is inevitably reduced in the same vertical range as the intersecting portion 70. . Therefore, in a state where the diaper is unfolded and the position in the vertical direction is the same as that of the intersecting portion 70, a non-stretchable region not having an elastic member is provided on the center side in the width direction of the intersecting portion 70 and the portion is attached to the exterior sheet 20. In the range where the longitudinal position is on the waist side of the intersecting portion 70 from the width direction center side edge of the intersecting portion 70 to the width direction center side of the intersecting portion 70, the fixing region 80 with the interior body 10 is used. It is desirable to provide a non-stretchable region that does not have an elastic member and to use that portion as a fixing region 81 between the exterior sheet 20 and the interior body 10. Specifically, as in the illustrated example, the fixed width between the exterior sheet 20 and the interior body 10 is set to be equal to or less than the interval between the intersecting portions 70 on both sides in the width direction in the same vertical range as the intersecting portion 70. On the waist side, it is proposed to make it wider (may be enlarged stepwise as in the illustrated example or may be enlarged continuously). Thereby, fixation of the interior body 10 becomes stronger.

  Moreover, while arrange | positioning the curved elastic members 26 ..., 28 ... in the front body F and the back body B, respectively, while ensuring the vertical direction separation | spacing range 90 without making the front and back curved elastic members 26 ..., 28 ... cross mutually, Also in this longitudinally spaced region 90, a non-stretchable region not having an elastic member is provided from the width direction outer side to the width direction center side of the intersecting portion 70 with respect to the width direction center side edge of the intersecting portion 70 and the portion is provided as an exterior sheet. It is also proposed that the fixed width 82 in the vertical direction separation range 90 is made wider than the fixed width in the same vertical direction range as the intersecting portion 70 as the fixed region 82 between the inner body 20 and the interior body 10. Thereby, fixation of the interior body 10 can be made still stronger.

(Front / rear presser sheet)
As shown in FIGS. 1 and 4, in order to cover the front and rear end portions of the interior body 10 attached on the inner surface of the exterior sheet 20 and to prevent leakage from the front and rear edges of the interior body 10, 50, 60 are provided. The illustrated embodiment will be described in more detail. The front presser sheet 50 extends over the entire width direction from the inner surface of the folded portion 20C of the waist side end portion to the position overlapping the front end portion of the interior body 10 in the inner surface of the front body F. The rear presser sheet 60 extends across the entire width direction from the inner surface of the folded portion 20C at the end on the waist side to the position overlapping the rear end of the interior body 10 in the inner surface of the back body B. If a slight non-adhesive portion is provided in the crotch side edges of the front and rear presser sheets 50, 60 over the entire width direction (or only the central portion), not only the adhesive does not stick out, but also this portion is removed from the surface sheet. It can be lifted slightly to function as a leak-proof wall.

  When the front and rear presser sheets 50 and 60 are attached as shown in the figure, there is an advantage that the degree of freedom of material selection is increased, but there are also disadvantages such as an increase in materials and manufacturing processes. Therefore, the folded portion 20C formed by folding the exterior sheet 20 on the inner surface of the diaper 1 can be extended to a portion overlapping the absorbent pad 200 to form a portion equivalent to the presser sheets 50 and 60 described above.

(Structural example of interior body)
As shown in FIGS. 5 to 7, the interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 made of a nonwoven fabric or the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like. The excretory fluid that has permeated through the top sheet 11 is absorbed and retained.

  As the liquid-permeable surface sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid permeable top sheet 11 is wound around the side edge of the absorber 13 and extends to the back side of the absorber 13.

  As the liquid-impermeable back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there. As the liquid-impermeable back side sheet 12, it is desirable to use an opaque sheet so that brown such as defecation and urine does not appear. Specifically, a plastic film in which pigments and fillers such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc, and barium sulfate are internally added is preferably used.

  Absorbent body 13 is a known one, for example, a pulp fiber stack, a filament aggregate such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. In the example shown in the figure, a shape formed with a substantially rectangular planar shape is used, and the width dimension is a dimension width that does not give the wearer a feeling of goreness by hitting the crotch part. The absorbent body 13 can be packaged with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer.

  As shown in FIG.8 and FIG.9, the absorber 13 has the overhang | projection part 13S which protrudes in the width direction outer side from the part of the front and back both sides in the crotch part. Although the absorber 13 can also be made into the integral structure including the overhang | projection part 13S as shown to Fig.14 (a), as the form shown to FIGS. 1-9, this main body part 13M and this main body It is desirable to employ a split structure having auxiliary portions 13A that form overhang portions 13S provided separately from the main body portion 13M on both sides in the width direction of the portion 13M. Further, in the case of such a divided structure, the shape of the main body portion 13M of the absorbent body 13 is a constricted shape (hourglass shape) in which the width of the crotch portion is narrower than the dorsal side and the abdominal side as illustrated. It can also be rectangular. Furthermore, when the main body 13M of the absorbent body 13 has a constricted shape, as shown in FIGS. 1 to 9, the auxiliary portion 13A as a whole is positioned on the outer side in the width direction from the constricted portion. As shown in (b), a part of the auxiliary portion 13A on the inner side in the width direction may be positioned in the constricted portion, and the remaining portion on the outer side in the width direction may be positioned as the protruding portion 13S on the outer side in the width direction of the constricted portion. it can.

  A solid gather BS that fits around the legs is formed on both sides of the interior body 10. This three-dimensional gather BS is formed of a gather sheet 15, and as the gather sheet 15, a non-woven fabric made into a double sheet by folding is suitably used as shown in FIGS. As with the liquid-permeable surface sheet 11, the material fiber constituting the gather sheet 15 is made of synthetic fiber such as polyethylene or polypropylene, synthetic fiber such as polyethylene or polypropylene, recycled fiber such as rayon or cupra, cotton, etc. Natural fibers can be used, and nonwoven fabrics obtained by appropriate processing methods such as the spunbond method, thermal bond method, melt blown method, and needle punch method can be used. It is preferable to use a non-woven fabric with excellent air permeability. Furthermore, for the gather sheet 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to improve the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic chromoid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.

  Characteristically, the three-dimensional gather BS further includes the side edge portion of the absorbent body 13 engulfed by the liquid-permeable surface sheet 11 from the upper side to reach the back side of the absorbent body 13 and exceeds the back side of the overhanging portion 13S. Extending to the center in the width direction. That is, the three-dimensional gather BS extends around the side of the absorber 13 from at least the back side of the overhanging portion 13 </ b> S of the absorber 13 to the side of the topsheet 11. And the part located in the back side of absorber 13 in solid gather BS is joined to the member (the back side entrainment part of top sheet 11 in the example of illustration) facing the front side by hot-melt adhesive etc., and a root part is formed, The front and rear end portions of the portion on the tip side of the root portion are non-standing portions 18, 18 fixed to members (surface sheet 11 in the illustrated example) positioned inside thereof, and between these non-standing portions 18, 18 The intermediate portion is a non-fixed free portion 19.

  Further, in the illustrated example, the three-dimensional gather BS has a plurality of elongated gather elastic elastic members 16, 16... Along the front-rear direction in the gather sheet 15 formed of a double sheet nonwoven fabric with an interval in the width direction. These are fixed in a stretched state along the front-rear direction, of which the plurality of roots are located on the back side of the outer portion in the width direction of the overhanging portion 13S of the absorber 13, and the plurality of tips are free parts Is located. It is preferable that at least one gather elastic elastic member 16, 16,... Is provided both on the back side of the widthwise outer side portion of the overhanging portion 13S of the absorber 13 and on the free portion.

  The gather elastic elastic member 16 may be made of a commonly used material such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, and natural rubber. it can. In order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 7.0 mm or less. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

  In the three-dimensional gather BS of the illustrated example, the portions on both sides in the width direction of the liquid-impermeable back sheet 12 enter the inside of the double sheet-like gather sheet 15, and as shown in FIG. However, the liquid impervious back side sheet 12 does not need to enter the three-dimensional gather BS.

  When the disposable diaper configured as described above is attached as shown in FIG. 10, the overhanging portion of the absorbent body 13 together with the three-dimensional gather BS by the contraction force of the gather elastic elastic member 16 in the crotch portion as shown in FIG. 11. The portion having 13S rises with respect to the central portion in the width direction, and the distal ends of the three-dimensional gather BS and the overhanging portion 13S of the absorbent body 13 fit into the thigh root depression between the crotch. Therefore, the fitting property with respect to the thigh root depression between the crotch is improved. Further, since the overhanging portion 13S of the absorbent body 13 enters and fits into the thigh root recess between the crotch, it is difficult for this portion to be stiff or bulky. In addition, since the overhanging portion 13S of the absorber 13 rises inside the three-dimensional gather BS, the excrement to get over the three-dimensional gather BS can be absorbed and retained by the overhanging portion 13S of the absorber 13, so-called side leakage prevention performance Will also improve.

  Moreover, as shown in FIGS. 1 to 9, the entire portion (or part of the portion) located on the back side of the overhanging portion 13 </ b> S of the absorbent body 13 in the three-dimensional gather BS may be a member adjacent to the front side ( In the example shown in the figure, when the surface sheet 11 is fixed to the back portion of the top sheet 11, the unity between the three-dimensional gather BS and the overhanging portion 13S of the absorber 13 is improved, and both are likely to be in an expected standing state, Since the three-dimensional gather BS is supported by the overhanging portion 13S of the absorbent body 13 at the crotch portion and is difficult to fall as a whole, so-called side leakage prevention performance is also improved. Of course, importance is attached to the independence of the three-dimensional gather BS and the overhanging portion 13S of the absorber 13, and the entire portion of the three-dimensional gather BS located on the back side of the overhanging portion 13S of the absorber 13 as shown in FIG. (Or the tip side portion may be a member that is not fixed to a member adjacent to the front side (in the illustrated example, the back side entangled portion of the topsheet 11), and that the portion on the center side in the width direction is adjacent to the front side It is good also as a root part.

  Further, as shown in FIGS. 1 to 9, when the protruding portion 13 </ b> S of the absorber 13 is provided by an auxiliary portion 13 </ b> A that is separate from the main body portion 13 </ b> M, the auxiliary portion 13 </ b> A is separated from the main body portion 13 </ b> M. Since it is easy to bend, the overhanging portion 13S of the absorbent body 13 is easily raised, and the followability to the movement of the body is improved.

  On the other hand, the overhanging portion 13S of the absorbent body 13 is configured such that the intermediate portion in the width direction of the overhanging portion 13S bulges to the front side rather than the both sides in the width direction, as shown in FIGS. ing. As a result, the portion having the overhanging portion 13S of the absorbent body 13 rises in a substantially square shape, and the tip portion thereof is easy to enter the thigh root depression between the crotch, and the compressibility in the thickness direction is improved. It will also be excellent in following the movement of the.

  As specific means for forming the protruding portion 13S of the absorbent body 13 in such a bulging shape, the following means are proposed in addition to forming the protruding portion 13S in a desired bulging shape in advance. That is, as shown in FIGS. 5, 8 and 9, the first means fixes the bulging elastic expansion / contraction member 17 to the back side of the overhanging portion 13 </ b> S of the absorbent body 13 in an extended state in the width direction. It is. As the bulging elastic expansion / contraction member 17, a tape-like or sheet-like one can be used in addition to an elongated shape such as a thread shape or a string shape. A plurality are provided at intervals in the direction. By providing such an elastic member 17 for bulging, the desired bulging shape can be stably formed and maintained, and the above-described compression recovery property is further improved.

  As shown in FIGS. 5, 8 and 9, the second means divides the protruding portion 13 </ b> S of the absorbent body 13 into a width direction outer side portion and a width direction inner side portion and separates them from each other. Is. In this case, the overhanging portion 13S of the absorbent body 13 is easy to bend so that the crease bulges to the front side with a crease between the outer portion in the width direction and the inner portion in the width direction. It can be formed and maintained stably.

  As shown in FIG. 12, the third means is that the overhanging portion 13S of the absorber 13 is integrally formed without being divided in the width direction, and the thickness of the outer portion A3 in the width direction and the inner portion in the width direction. The thickness of A4 is different. In this case, the overhanging portion 13S of the absorbent body 13 is easily bent so that the force concentrates on the step between the outer portion A3 in the width direction and the inner portion A4 in the width direction, and the crease bulges to the front side. Thus, the desired bulging shape can be stably formed and maintained.

  As shown in FIG. 13, the fourth means is that the protruding portion 13 </ b> S of the absorber 13 is integrally formed without being divided in the width direction, and the width is provided at both front and rear end portions (which may be either one end portion). A notch 13c toward the boundary between the outer portion A5 and the inner portion A6 in the width direction, for example, a triangular notch (notch) 13c having a vertex on the boundary as in the illustrated example is formed. . In this case, when the force concentrates on the tip of the cut portion 13c in the overhanging portion 13S of the absorber 13, the crease bulges to the front side with the boundary between the widthwise outer portion A5 and the widthwise inner portion A6 as the fold. Thus, it becomes easy to bend, and the desired bulging shape can be stably formed and maintained.

In the present invention, as long as the first means is adopted, the first to fourth means can be applied in appropriate combination.

  INDUSTRIAL APPLICABILITY The present invention can be used for absorbent articles in general, such as pants-type disposable diapers as in the above examples, pad-type or tape-type disposable diapers, and sanitary napkins.

  DESCRIPTION OF SYMBOLS 1 ... Pants type disposable diaper, 10 ... Interior body, 11 ... Liquid-permeable surface sheet, 12 ... Liquid-impermeable back side sheet, 13 ... Absorber, 14 ... Packaging sheet, 15 ... Gather sheet, 16 ... Thread-like elastic expansion and contraction 20 ... exterior sheet, 21.22 ... side joint edge, 24 ... waist elastic member, 25 ... waist elastic member, 26 ... dorsal curve elastic member, 28 ... ventral curve elastic member, 29 ... leg circumference Line, 20C ... exterior sheet folded portion, 70 ... intersection, 71 ... non-fixed region, 80, 81, 82 ... fixed region, [theta] ... longitudinal crossing angle, F ... front body, B ... back body.

Claims (7)

With a liquid-permeable top sheet, a liquid-impermeable back side sheet, and an absorber interposed between these sheets,
In the absorbent article provided with three-dimensional gathers extending along the front-rear direction from the front side of the crotch part to the rear side of the crotch part on both sides in the width direction,
In the developed state of the three-dimensional gather, the absorbent body has an overhanging portion projecting outward in the width direction from the front and rear sides of the crotch portion,
The three-dimensional gather extends at least from the back side of the overhanging portion of the absorbent body to the side of the absorbent sheet on the side part of the absorbent article having the three-dimensional gather. In addition, the portion located on the back side of the absorber has a root portion fixed to a member adjacent to the front side,
The front and rear ends of the portion of the three-dimensional gather that is closer to the tip than the base portion are non-stand-up portions that are fixed to members positioned inside thereof, and the intermediate portion between the non-stand-up portions is unfixed. And
In each of the portion located on the back side of the overhanging portion in the three-dimensional gather and the free portion, an elongated gather elastic elastic member is fixed in an extended state along the front-rear direction,
The portion having the protruding portion of the absorber together with the three-dimensional gather by the contraction force of the gather elastic elastic member is configured to rise with respect to the central portion in the width direction ,
The overhanging portion is configured such that the intermediate portion in the width direction bulges to the front side of both sides in the width direction, and the intermediate portion in the width direction of the overhanging portion is arranged in the width direction on the back side of the overhanging portion. The bulging elastic elastic member for bulging to the front side rather than both sides is fixed in a state of extending in the width direction ,
An absorbent article characterized by the above.   2. The absorption according to claim 1, wherein the absorbent body includes a main body portion and auxiliary portions having the projecting portions provided separately from the main body portion on both sides in the width direction of the main body portion. Sex goods. The overhang portion is divided into a width direction outer side portion and a width direction inner side portion, and a fold bulges to the front side with a crease between the width direction outer portion and the width direction inner portion. absorbent article by said width direction intermediate portion is configured so as to bulge to the front than its widthwise sides, according to claim 1, wherein the bent. The overhanging portion is integrally provided with a widthwise outer portion and a widthwise inner portion having different thicknesses, and a fold is formed by using a step between the widthwise outer portion and the widthwise inner portion as a fold. The absorbent article according to claim 1 , wherein the absorbent article according to claim 1 is configured such that the intermediate portion in the width direction bulges to the front side of both sides in the width direction by being bent so as to bulge to the front side. The overhanging portion is integrally provided with a widthwise outer portion and a widthwise inner portion, and a cut toward the boundary between the widthwise outer portion and the widthwise inner portion at at least one of the front and rear ends. The intermediate portion in the width direction is formed on both sides of the width direction by bending so that the crease bulges to the front side with the boundary between the outer portion in the width direction and the inner portion in the width direction as a crease. The absorbent article according to claim 1 , wherein the absorbent article is configured to bulge to the front side. The absorbent article of which the part or the whole of the portion located on the back side of the overhang portion of the absorber is fixed to the member adjacent to the front, according to claim 1, wherein one of the standing gathers. An exterior sheet having a front body and a back body, and an interior body fixed to the inner surface of the exterior sheet,
The interior body includes the liquid-permeable top sheet, the liquid-impermeable back side sheet, and the absorbent body interposed between these sheets, and on both sides in the width direction, crotch portions Each of the three-dimensional gathers extending along the front-rear direction from the front side to the rear side of the crotch part,
A pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed by joining the front body and the back body of the exterior sheet on both sides.
The absorbent article of any one of Claims 1-6 .

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