JP5401234B2 - Pants-type disposable diaper - Google Patents

Description

  The present invention relates to a pants-type disposable diaper having an exterior sheet having both fit, thinness and flexibility.

  The pants-type disposable diaper includes an exterior sheet having a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, and the front body and the back body of the exterior sheet are on both sides. Are joined together to form a waist opening and a pair of left and right leg openings.

  In the pants-type disposable diaper, in order to improve the fit to the body, fixing various elastic members to the exterior sheet in an expanded state (see, for example, Patent Documents 1 to 6), The one provided with the waist elastic member, the waist elastic member, and the curved elastic member (represented in Patent Document 6) has a relatively high fit to the body. Here, a plurality of waist elastic members are arranged in parallel along the width direction at intervals in the vertical direction at the edge of the waist opening. Further, the waist elastic member is disposed along the width direction with a space in the vertical direction in a region closer to the center in the front-rear direction than the waist elastic member. Furthermore, the curved elastic member extends while curving from both side portions of at least one of the front body and the back body so as to go to the opposite body side toward the center in the width direction.

  The waist elastic member fits the crotch side part from the edge of the waist opening to the body by the contraction force in the waist direction, and the front and rear ends of the interior body are pressed against the body to fit the interior body. It also plays the role of preventing leakage of excrement from the front and back of the stool. The curved elastic member has a function of fitting the exterior sheet to the buttock and lifting the crotch portion of the interior body toward the waist.

  The fit of diapers equipped with these elastic members is very excellent, but there may be steps on both sides in the width direction of the interior body due to the thickness of the interior body, so the width direction of the front end of the interior body The fit between the parts on both sides and the body surface tends to be insufficient, particularly when the wearer is in a lateral position. When such a situation occurs, excrement is liable to leak through the gap between the body surface and the both sides in the width direction of the front end of the interior of the diaper.

  Furthermore, it is common that solid gathers projecting to the body side are provided on both sides of the interior body, but it is necessary to fix the solid gathers in a state of being folded flat at the front and rear ends of the interior body. Therefore, although there is a leakage prevention effect at the front and rear direction middle part of the both sides of the interior body, there is almost no leakage prevention function at the front and rear end parts, which rather increases the step between the interior body and the exterior sheet. This point also contributed to the leakage as described above.

  In order to solve this problem, it has been proposed to provide auxiliary absorbers on both sides in the width direction of the front and rear ends of the interior body on the inner surface of the exterior sheet (see, for example, Patent Documents 1 and 2).

JP-A-7-265357 JP-A-7-299094 JP-A-11-36103 JP 2001-258931 A JP 2001-204762 A JP 2006-043415 A

However, the region where the auxiliary absorber is provided in the diaper is a portion that comes into contact with the upper anterior iliac spine in the front body, and a portion that comes into contact with the iliac crest in the back body. If an auxiliary absorber having a thickness is provided at such a portion that comes into contact with the raised portion of the body surface, a gap is generated around the auxiliary absorber, and the problem that the leakage is promoted, There is a problem that the provided portion is easily displaced.
In addition, when an auxiliary absorber is provided, the hit against the body becomes stronger due to the increase in thickness by the auxiliary absorber. Therefore, when such an auxiliary absorbent body is provided in a portion that comes into contact with the upper anterior iliac spine or the iliac crest, there is also a problem that pressure ulcer is likely to occur.
Then, the main subject of this invention is preventing generation | occurrence | production of the leak by the thickness increase of an auxiliary | assistant absorber, a slippage, and a pressure ulcer.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An exterior sheet having a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, and the front body and the back body of the exterior sheet are joined at side seal portions on both sides By doing so, a waist opening and a pair of left and right leg openings are formed,
Of the inner surface of the front body, the front auxiliary absorbent body is provided in a front side region including both sides of the front end portion of the inner body in the width direction and including the upper anterior iliac spine contact portion and the periphery thereof, In pants-type disposable diapers,
In the front auxiliary absorber, a part of the front side region including the upper anterior iliac spine contact portion is a thin portion, or the upper front iliac spine in the front side region. It is not provided for a part including the contact part,
A pants-type disposable diaper characterized by that.

(Function and effect)
In this way, the upper anterior iliac spine contact portion of the front auxiliary absorber is a thin portion, or the upper anterior iliac spine contact portion is not provided with the front auxiliary absorber, The auxiliary absorber does not hit the upper anterior iliac spine, but only hits the periphery of the upper anterior iliac spine. Therefore, even if there is a thickness of the front auxiliary absorber itself, there is little or no influence of the bulging of the upper anterior iliac spine, so that it becomes difficult for gaps to occur around the front auxiliary absorber and leakage hardly occurs. In addition, the portion having the auxiliary absorber becomes difficult to shift. In addition, the front auxiliary absorber does not hit the upper anterior iliac spine, but only the area around the upper anterior iliac spine. The pressure ulcer resulting from the front auxiliary absorber can be effectively prevented. Moreover, the fit of other parts and the feeling of wearing are not impaired.

<Invention of Claim 2>
Among the inner surfaces of the back body, the back auxiliary absorbent body is provided in the rear side region including the width direction both sides of the rear end portion of the interior body and including the iliac crest contact portion and the periphery thereof,
In the rear auxiliary absorber, a part including the iliac crest contact part in the rear side region is a thin part, or a part including the iliac crest contact part in the rear side region Is not provided for,
The pants-type disposable diaper according to claim 1.

(Function and effect)
In this way, the posterior auxiliary absorber is made of the body by making the upper iliac crest abutting portion of the rear auxiliary absorber a thin wall portion or not providing the posterior auxiliary absorber at the iliac crest abutting portion. Instead of hitting the iliac crest, it hits only around the iliac crest. Therefore, even if there is a thickness of the posterior auxiliary absorber itself, there is little or no influence of the ridge of the iliac crest, so that a gap is less likely to occur around the posterior auxiliary absorber, and leakage is less likely to occur. The portion having the absorber becomes difficult to shift. Furthermore, the posterior auxiliary absorber does not hit the iliac crest of the body, but only hits the periphery of the iliac crest, so that the hit against the iliac crest does not become strong and is caused by the posterior auxiliary absorber. It can effectively prevent pressure ulcers. Moreover, the fit of other parts and the feeling of wearing are not impaired.

<Invention of Claim 3>
Both the front body and the back body are each provided with a curved elastic member that extends while curving toward the opposite body side as it goes from both side seal portions toward the center in the width direction,
The front auxiliary absorber and the rear auxiliary absorber are not provided in a portion that overlaps the curved elastic member, or a portion that overlaps the curved elastic member,
The pants-type disposable diaper according to claim 2.

(Function and effect)
Such a curved elastic member is suitable for improving the fitting property to the ridge portion or the ridge groove, but depending on the arrangement, it will cross a portion suitable for providing the auxiliary absorbent body. Not only the fit property by the elastic member is lowered, but the auxiliary absorbent body may be bent or cracked due to the shrinkage, and the fit property and absorption performance of the auxiliary absorbent body may be lowered. Therefore, when the curved elastic member is provided, as described above, the front auxiliary absorber and the rear auxiliary absorber are provided in a portion where the curved elastic member overlaps with the thin elastic portion or the curved elastic member. Preferably not.

<Invention of Claim 4>
In both the front body and the back body, a plurality of elongated waist elastic members extending along the width direction are provided at the edges of the waist opening at intervals in the vertical direction. A plurality of elongate waist elastic members extending along the width direction are provided in the longitudinal direction center portion side than the front elastic member, with a space in the vertical direction,
The waist elastic member and the waist elastic member are at least in the same longitudinal direction range as the front auxiliary absorber, and are located in the middle region between the two front auxiliary absorbers and from the outer end in the width direction of the front auxiliary absorber. It is provided in the side region up to the seal portion, and is not provided between the intermediate region and the side region, and at least in the same longitudinal range as the rear auxiliary absorber, between the two rear auxiliary absorbers The intermediate region and the rear auxiliary absorber are provided in the side region from the outer end in the width direction to the side seal portion, and are not provided between the intermediate region and the side region,
The pants-type disposable diaper according to claim 3.

(Function and effect)
In a pants-type disposable diaper, providing the waist elastic member and the waist elastic member as described above has been conventionally performed, but when providing an elastic member along such a width direction, the elastic member serves as an auxiliary absorber. When crossing, the auxiliary absorbent body may be twisted or cracked due to shrinkage, and the fit and absorption performance of the auxiliary absorbent body may be reduced. This problem can be solved by not providing an elastic member in a region that overlaps the entire auxiliary absorber, but in that case, it has been found that a gap is likely to be formed on the outer side in the width direction of the auxiliary absorber. This is thought to be due to the fact that the curvature change of the waist surface of the body increases as it goes to the side. On the other hand, as described above, by arranging the waist elastic member and the waist elastic member, the contraction force acts only on the outer end in the width direction of the auxiliary absorber. While the gap is difficult to form, the auxiliary absorbent body is difficult to bend or cracked due to contraction.
In addition, the form in which the elastic member is not provided includes a form in which the elastic member is present, but a form in which the elastic member is present but is finely cut to the extent that the contraction force does not act is included.

<Invention of Claim 5>
A plurality of rectangular front auxiliary absorbers are provided at intervals in each anterior side region, and the interval portion is configured to be the upper anterior iliac spine contact portion,
A plurality of rectangular rear auxiliary absorbers are provided at intervals in each of the posterior side regions, and the interval portions are configured to be the iliac crest contact portions.
The pants-type disposable diaper according to claim 4.

(Function and effect)
In this way, by adopting a spacing arrangement of a plurality of rectangular auxiliary absorbers, an auxiliary absorber having a simple and easy-to-manufacture shape can be used for the upper anterior iliac spine contact portion and iliac crest contact portion. The form which does not provide an auxiliary absorber can be comprised.

<Invention of Claim 6>
In each of the front side regions, a plurality of rectangular front auxiliary absorbers having different widths are juxtaposed in the vertical direction, or a plurality of rectangular front auxiliary absorbers having different vertical lengths. Are arranged side by side in the width direction, and each front auxiliary absorber is arranged so that the position of the corner portion on the outer side in the width direction and the crotch side of each front auxiliary absorber is along the curved elastic member,
In each of the rear side regions, a plurality of rectangular rear auxiliary absorbers having different widths are arranged in the vertical direction, or a plurality of rectangular rear auxiliary absorbers having different vertical lengths are arranged in the width direction. The rear auxiliary absorbers are arranged so that the positions of the corners on the outer side in the width direction and the crotch side of the rear auxiliary absorbers are along the curved elastic member.
The pants-type disposable diaper according to claim 4 or 5.

(Function and effect)
By adopting a parallel arrangement of a plurality of rectangular auxiliary absorbers in this way, a simple and easily manufactured auxiliary absorber is used to assist in a wider range while avoiding a portion overlapping the curved elastic member. An absorber can be provided.

<Invention of Claim 7>
A solid gather covering the entire front-rear direction is provided on both sides in the width direction of the interior body. The solid gather is fixed in a state where both front and rear ends are flatly folded, and a portion between these is gathered on the body side. Is configured to protrude
The pants-type disposable according to claim 6, wherein the auxiliary absorbent body is attached to the inner surface of the exterior sheet as an auxiliary interior body interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet. Diapers.

  As described above, according to the present invention, there are advantages such as prevention of leakage and displacement due to an increase in the thickness of the auxiliary absorbent body and generation of pressure sores.

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 a perspective view of the wearing state of a pants type disposable diaper. It is a top view which shows an adhesive agent application pattern. It is a top view (inner surface side) of the underpants type disposable diaper of a deployment state. It is a bottom view of an auxiliary main interior body.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1-7 has shown the underpants type disposable diaper 1 of embodiment. This pants-type disposable diaper 1 (hereinafter also simply referred to as a diaper) includes an exterior sheet 20 having a front body F and a back body B, and a main interior body 10 fixed and integrated on the inner surface of the exterior sheet 20. The main interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12. In manufacturing, after the back surface of the main 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 main interior body 10 and the exterior sheet 20 are connected to the front body F and The waist opening is formed by folding in the center in the longitudinal direction (front-rear direction) which is the boundary of the back body B, and the side seal portions 21 and 22 at both side edges thereof being joined to each other by heat welding or hot melt adhesive. And it becomes a pants type disposable diaper in which a pair of left and right leg openings are formed.

(External sheet structure example)
As shown in FIGS. 4 to 6, the exterior sheet 20 is a nonwoven fabric sheet having a two-layer structure composed of an upper layer nonwoven fabric 20 </ b> A and a lower layer nonwoven fabric 20 </ b> B (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 particular, in the illustrated exterior sheet 20, as the elastic member, in the developed shape shown in FIGS. 1 to 3, the waist elastic members 24, 24. The back body 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 members in the front body F and the back body B respectively. Apart from the groups 25, 25..., Both side portions of the main interior body 10 are curved so as to be directed toward the opposite body side toward the center in the width direction from the both side joining edges joining the front body F and the back body B. A plurality of curved elastic members 26, 28, which extend to a portion that overlaps (or does not necessarily overlap, such as the vicinity of both side portions) and are arranged at intervals without crossing each other. prepare for That. 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 seal portions 21 and 22 where the front body F and the back body B are joined, and are arranged at intervals in the vertical direction. It is a thread rubber-like elastic member, and is used to attach 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-like elastic members arranged along the width direction at intervals in the vertical direction over the range from the upper part to the lower part of the side seal parts 21, 22. It is a member for applying a stretching 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 main 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 3 to 20 mm, preferably about 6 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 main interior body, the vertical crossing angle θ is arranged along a predetermined curve having a crossing portion 70 with 60 ° or less. There may be one ventral curved elastic member 2826, but a plurality of ventral curved elastic members 2826 are preferable. In the illustrated example, there are five thread-like elastic members, and these ventral curved elastic members 28, 28. Without being spaced apart. 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 3 to 20 mm, preferably about 6 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 main interior body 10. The part 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, cross the main interior body 10 from the side joint edge 22 on one side and the other (opposite) side. After providing continuously to the part joining edge 22, the general form which cut | disconnects some or all of the part which crosses the main interior body 10, and makes it discontinuous is contained. By making the elastic member discontinuous at the portion overlapping the main interior body 10, it is possible to further prevent the main interior body (particularly the absorber 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 main 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. Further, in order to cut the curved elastic members 26, 28,... On the main interior body 10 to make them discontinuous, JP-A-2002-35029, JP-A-2002-178428 and JP-A-2002-273808 are disclosed. The described cutting method 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 10 to 15 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.

(Configuration related to flexibility of exterior sheet 20)
The longitudinal range having the waist elastic members 25... And the longitudinal range 31 having the curved elastic members 26..., 28. A plurality of elastic members 25 (for example, about 5 to 10) are included, and an interval d1 between at least some of the waist elastic members 25 is larger than an interval d2 between the other waist elastic members 25. It is getting wider. Further, even outside the overlapping range 30, the waistline elastic members 25... Are in an intermediate range 32 between the longitudinal range 31 having the curved elastic members 26, 28... And the longitudinal range having the waist elastic member 24. A plurality (for example, about 10 to 16) are provided.

  In this way, while allowing the overlap range 30 between the longitudinal range having the waist elastic members 25 ... and the longitudinal range having the curved elastic members 26, 28 ... to some extent, the waist elastic members 25 within the range. By providing a portion with a large mutual interval, the denseness of the elastic members can be suppressed without impairing the fit. As a result, the pleats are not concentrated on the exterior sheet 20 in the overlapping range 30, an unnecessary increase in thickness, the elastic member itself and hardening due to its adhesion are suppressed, and a flexible and comfortable wearing feeling can be obtained. Become.

  In a normal case, the mutual spacing d1 of the waist elastic members 25 is preferably about 15 to 50 mm, and the mutual distance d2 of the other waist elastic members 25 is preferably about 10 to 20 mm. The longitudinal length of the overlapping range 30 is preferably about 15 to 30% of the total length of the diaper in the unfolded state, and the waist portion elastic members 25 occupying the overlapping range 30 have a wide interval portion 35. The ratio is preferably about 60 to 100% in the ratio of the length in the vertical direction (that is, the sum of the distances d1 / the vertical length of the overlapping range 30). If the overlapping range 30 is too narrow, the significance of widening the interval between the waist elastic members 25 becomes thin. If it is too wide, the wide portion 35 of the waist elastic members 25 increases, resulting in a decrease in fit. In addition, if the ratio of the wide portion 35 of the waist elastic members 25... Occupying the overlapping range 30 is too small, improvement in flexibility can be expected, but remarkable improvement becomes difficult.

  Specifically, in the case of the illustrated example, the ratio of the wide portion 35 having the mutual interval d1 of the waist elastic members 25 to the overlapping range 30 is about 40% in the front body F and 100% in the back body B. . As described above, the configuration relating to the improvement in flexibility can be made different between the front body F and the back body B, and can be applied only to either the front body F or the back body B in the exterior sheet 20. (same as below).

  On the other hand, the waist elastic member 24, the waist elastic member 25, and the curved elastic members 26, 28,... Are sandwiched between a pair of sheet layers 20A, 20B constituting the exterior sheet 20, and the sheet layers 20A, 20B, The adhesive is fixed to 20B with an adhesive, and the amount of adhesive applied greatly affects the flexibility of the exterior sheet 20. Therefore, as shown in FIG. 8, the adhesive portions B1 and B2 by the adhesive include the arrangement portion and the vicinity thereof of the waist elastic member 24, the arrangement portion and the vicinity thereof of the waist elastic member 25, and the curved elastic member 26. , 28... And a region within a predetermined distance a within each length and width (normally within ± 25 mm, more preferably within ± 10 mm, particularly preferably within ± 5 mm), and both sheets other than these adhesives. It is preferable not to apply an adhesive between the layers. In this way, by reducing the adhesive application portion as much as possible, hardening by the adhesive can be suppressed at each stage. In addition, when this is combined with an increase in the local spacing between the waist elastic members 25...

  FIG. 8 shows application sites B1, B2 of the hot melt adhesive in the manufacturing process, and the curved elastic members 26, 28,... Before cutting the portion crossing the main interior body 10 as shown by the two-dot chain line. Indicates the state. Adhesives B1 and B2 for fixing the waist elastic member 24 and the waist elastic member 25 to the two sheet layers 20A and 20B are substantially applied only to the arrangement portions of the elastic members 24 and 25 and the vicinity thereof. Yes. Such application of the adhesive can be realized by sandwiching the elastic members 24 and 25 having the adhesive applied to the outer peripheral surface between the two sheet layers 20A and 20B, and the outer peripheral surfaces of such elastic members 24 and 25. The adhesive can be applied to a Nordson Surerup nozzle.

  On the other hand, the adhesive for fixing the curved elastic members 26, 28 ... to the two sheet layers 20A, 20B has a rectangular adhesive-applied portion B2 having a stepped shape along the bending direction of the curved elastic members 26, 28 ... , The adhesive is applied only to the portion where the curved elastic members 26, 28,..., 28..., 28. ing. In the application process, in the normal form in which the lateral direction (diaper width direction) of the sheet layers 20A and 20B is along the line MD direction (flow direction) in the application process, the adhesive layer crosses the line CD direction (MD direction). In the direction), a plurality of slot coating nozzles are arranged in parallel, and the adhesive can be applied independently and intermittently from each nozzle.

(Example of main interior structure)
As shown in FIGS. 5 to 7, the main 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 excreted liquid that has permeated through the top sheet 11 is absorbed and held.

  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.

  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. The shape of the absorber 13 may be a rectangular shape as shown in the figure, or may be an hourglass shape (constricted shape) in which the width of the crotch portion is narrower than the back side and the abdominal side.

  It is preferable that solid gathers 17 that fit around the legs are formed on both sides of the main interior body 10. The three-dimensional gather 17 is formed of a gathered nonwoven fabric 15. As the gathered nonwoven fabric, as shown in FIGS. 6 and 7, a nonwoven fabric made into a double sheet by folding is preferably used. The side edge portion of the wound absorbent body 13 is further wound from the upper side thereof and extends to the back surface side of the absorbent body 13 to be bonded. More specifically, the gathered nonwoven fabric 15 has a three-dimensional gather 17 forming portion in the middle portion in the longitudinal direction of the diaper 1 and a range extending from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. In the longitudinal direction front and rear end portion 18, the section from the intermediate portion in the width direction to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and the portion forming the three-dimensional gather 17 is the absorber 13. It is bonded with a hot-melt adhesive or the like while being folded flat on the upper surface portion (the hatched portion in FIG. 1 is hereinafter referred to as a flat fixing portion).

  Inside the gathered nonwoven fabric 15 formed of a double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 16, 16... The thread-like elastic elastic members 16, 16... Are for forming a three-dimensional gather 17 by raising the nonwoven fabric portion protruding from the absorber side edge by elastic elastic force as shown by a two-dot chain line in FIG. It is.

  The liquid-impermeable back side sheet 12 enters the double sheet-like gathered nonwoven fabric 15 and constitutes a leak-proof wall on the lower end side of the three-dimensional gather 17, as shown in FIG. . 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. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.

  As the thread-like elastic elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, and the like that are usually used can be used. 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 same manner as the liquid-permeable surface sheet 11, the material fibers constituting the gathered nonwoven fabric 15 are olefin-based, polyester-based, amide-based synthetic fibers such as polyethylene or polypropylene, regenerated fibers such as rayon and cupra, and cotton. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a nonwoven fabric that suppresses the basis weight and has excellent air permeability. Furthermore, for the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.

(Fixing the main interior and exterior sheets)
The main interior body 10 and the exterior sheet 20 have 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,. In the vertical direction range (total vertical direction range in the illustrated example) of 80% or more of the dot pattern portion), the exterior sheet 20 and the main interior body 10 are not fixed, and the other portions 80, 81, 82 The exterior sheet 20 and the main 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 not applied to the side part of the main interior body 10 almost or not, and as a result, the curved elastic members 26, 28, ... and both side parts of the main interior body 10 are connected. Even in the overlapping region, 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 main 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 main interior body 10 must be reduced in the same longitudinal range as the intersecting portion 70. Absent. 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 outer side in the width direction to the center side in the width direction of the intersecting portion 70 from the width direction center side edge, the fixing region 80 with the main interior body 10 is used. In addition, 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 main interior body 10. Specifically, as in the illustrated example, the fixed width between the exterior sheet 20 and the main 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. It is proposed to make it wider on the waist side (may be enlarged stepwise as in the illustrated example or may be enlarged continuously). Thereby, fixation of the main 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 this portion is provided as an exterior sheet. It is also proposed that the fixed width 82 in the vertical direction separation range 90 is set to be larger than the fixed width in the same vertical direction range as the intersecting portion 70 by using the fixed region 82 between the main body 10 and the main interior body 10. Thereby, fixation of the main interior body 10 can be made still stronger.

(Front / rear presser sheet)
As shown in FIG. 1 and FIG. 4, the front and rear ends of the main interior body 10 mounted on the inner surface of the exterior sheet 20 are covered, and the front and rear edges of the main interior body 10 are prevented from leaking. Presser sheets 50 and 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 at the waist side end portion of the front body F to the position overlapping the front end portion of the main interior body 10. The rear presser sheet 60 extends across the entire width direction from the inner surface of the folded back portion 20C of the waist side end portion of the rear body B to the position overlapping the rear end portion of the main interior body 10. 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.

(About the non-woven fabric constituting the exterior sheet)
Of the non-woven fabrics constituting the exterior sheet 20, at least the outermost non-woven fabric 20B preferably has a twist degree of 3.8 gf · cm / cm or less. It is desirable to employ the same nonwoven fabric as the outermost nonwoven fabric 20B for all the nonwoven fabrics constituting the exterior sheet 20, that is, the other nonwoven fabrics 20A, 50, 60 that are not located on the outermost side (the same applies hereinafter). In this way, when a nonwoven fabric with a sufficiently low twist is used, the flexibility of the diaper as a whole is remarkably increased, and as a result, the feeling of wearing and the skin troubles such as itching and rash due to rubbing with the skin are reduced. In addition, there are advantages such as easy removal and attachment. If the degree of twist is not sufficiently low, the effect of improving flexibility is not exhibited. Such a twist degree can be achieved, for example, by selecting the type of raw fiber, reducing the fineness, shortening the fiber length, reducing the basis weight or thickness, and the like.

  Further, the ratio MIU / MMD between the average surface friction coefficient and the average deviation in the outermost nonwoven fabric 20B is preferably 20 or more, and more preferably 25 or more. By sufficiently increasing the MIU / MMD ratio, the feel of the exterior sheet surface is improved, so that the suppleness is compensated, and skin troubles such as itching and rash due to rubbing with the skin are further reduced. become. Such an MIU / MMD ratio can be achieved, for example, by reducing the fineness or performing surface processing.

In addition, the outermost nonwoven fabric 20B has a thickness when the basis weight is 10 to 30 g / m ² and the pressure is 0.5 g / cm ² so as not to impair the basic functions (hiding function, strength, etc.) as the exterior sheet 20. It is preferable that T0 is 0.1 to 1.0 mm. A more preferable basis weight is 13 to 22 g / m ² , and a thickness T0 is 0.1 to 0.5 mm.

  Furthermore, in order to compensate for flexibility, the bending resistance of the outermost nonwoven fabric 20B according to JIS-L-1096 (45 degree cantilever method) is preferably 45 mm or less, and more preferably 35 mm or less. Thereby, the reduction of the feeling of tingling and the ease of putting on and taking off become even more preferable. Such bending resistance can be achieved, for example, by selecting the type of raw fiber, changing the ratio, lowering the embossing pressure, reducing the basis weight or thickness, and the like.

  Since the strength tends to decrease when the flexibility is improved, the outermost nonwoven fabric 20B has a tensile strength defined in JIS-P-8113 of 40 to 120 kgf / m in the width direction, particularly 60 to 100 kgf / m, in the front-rear direction. It is preferably 10 to 80 kgf / m, particularly 25 to 60 kgf / m, and the tear strength specified in JIS-P-8116 is preferably 4 to 30 kgf / m, particularly 8 to 25 kgf / m in the front-rear direction. Such tensile strength and tear strength can be achieved, for example, by increasing the degree of entanglement between fibers.

  The compression characteristics of the outermost nonwoven fabric 20B are also closely related to flexibility. Therefore, the compression characteristics of the outermost nonwoven fabric 20B are such that the compression hardness LC is 0.3 to 1.0, particularly 0.5 to 0.9, and the compression work WC is 0.01 to 0.10. The compression resilience RC is preferably 20 to 90%, particularly preferably 25 to 70%. Such compression hardness LC, compression work WC, and compression resilience RC can be achieved, for example, by selecting the type of raw fiber, changing the ratio, reducing the basis weight, and the thickness.

  The outermost nonwoven fabric 20B is not particularly limited with respect to the material, structure, manufacturing method, fineness, fiber length (short fiber, filament), and the like of the raw fiber. For example, the raw fiber can be appropriately selected from olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, natural fibers such as cotton, and the fiber structure is parallel. It can be suitably selected from two-layer type composite fibers such as molds and core-sheath types, multilayer type composite fibers, non-composite fibers, mixed fibers, and split fibers. Furthermore, as a manufacturing method, it can select and use suitably from well-known methods, such as the spunlace method, the spun bond method, the thermal bond method, the melt blown method, the needle punch method, the air through method, the point bond method. Known specifications can be adopted for the fineness and fiber length of the fiber, but the fineness is preferably 0.7 to 3 dtex, particularly 1 to 2.5 dtex.

(Example of auxiliary absorber structure)
Among the inner surface of the front body F, the front side part region including both sides in the width direction of the front end portion of the main interior body 10 and including the upper anterior iliac spine contact portion and its periphery includes a front auxiliary absorber 113. A front auxiliary interior body 100 is provided, and among the inner surfaces of the back body B, the rear side part includes both sides in the width direction of the rear end portion of the main interior body 10 and includes the iliac crest contact portion and the periphery thereof. A rear auxiliary interior body 200 including a front auxiliary absorber 213 is provided in the region.

  As shown in FIG. 6 and FIG. 10 (a), the auxiliary interior bodies 100, 200 include liquid-permeable top sheets 111, 211 made of nonwoven fabric and the like, and liquid-impermeable back side sheets 112, 212 made of polyethylene or the like. Between them, it has the structure which interposed the absorbers 113 and 213, and absorbs and holds the excretion liquid which permeate | transmitted the surface sheets 111 and 211. The absorbent bodies 113 and 213 are packaged by a wrapping sheet 114 (rear auxiliary interior body 200 is not shown) such as crepe paper, etc. having liquid permeability and liquid retention, as necessary, for holding the shape and polymer. Can do. These materials can be appropriately selected from the same materials as the main interior body 10. In the case where a material having high shape retention, soft and gentle to the skin is used as the absorbers 113 and 213, only the absorbers 113 and 213 can be provided on the inner surface of the exterior sheet 20.

  Characteristically, the front auxiliary absorber 113 is not provided in a part including the upper anterior iliac spine contact portion in the front side region, and the rear auxiliary absorber 213 is provided in the rear side region. Are not provided in a part including the iliac crest contact portion. Instead of providing the auxiliary absorbers 113 and 213, a part including the upper anterior iliac spine contact part in the front auxiliary absorber 113 and a part including the iliac crest contact part in the rear auxiliary absorber 213 Can also be a thin-walled portion. The thin portion may be formed by compression processing, but may be formed by reducing the basis weight (weight per unit area) of the material.

  The shape of the non-absorbent part (or thin part) not provided with the front auxiliary absorber 113 includes the upper anterior iliac spine contact portion, and the non-absorbent part (or thin part) without the rear auxiliary absorber 213 provided. As long as the iliac crest contact portion is included, the shape can be determined as appropriate. In the front auxiliary absorbent body 113 in the illustrated example, the longitudinal non-absorbent body portion 113Y extending along the vertical direction from the vicinity of the lower end portion to the vicinity of the upper end portion in the intermediate portion in the width direction has an upper anterior iliac spine contact portion. It corresponds to. Further, in the illustrated example, a lateral non-absorbent body portion 113X is provided at the iliac crest contact portion extending from the upper end of the longitudinal non-absorbent portion 113Y in the front auxiliary absorbent body 113 toward the outer side in the width direction. Yes. Instead of such a bent shape, a non-absorbing portion (or thin portion) such as a curved shape or an elliptical shape including the same bent regions 113X and 113Y can be provided. Further, in the rear auxiliary absorbent body 213 in the illustrated example, a lateral non-absorbent body portion 213X extending from the vicinity of the widthwise central end portion toward the widthwise outer side in the vicinity of the longitudinal upper end portion thereof is in contact with the iliac crest. Corresponds to the site. Although it is linear in the illustrated example, it may be curved.

  Thus, by providing the non-absorbent body portion 113Y that does not have the front auxiliary absorber 113 at the upper anterior iliac spine contact portion in the front armpit region, the front auxiliary absorber 113 can be connected to the upper anterior iliac bone of the body. Instead of hitting the thorn, it hits only the surrounding area. In the illustrated example, the non-absorbent body portion 113X that does not have the front auxiliary absorber 113 is also provided at the iliac crest contact portion in the front side region, so the front auxiliary absorber 113 does not hit the iliac crest. Only hits the surrounding area. Further, by providing the nonabsorbent part 213X not having the posterior auxiliary absorber 213 at the iliac crest abutting portion in the posterior armpit region, the posterior auxiliary absorber 213 does not hit the iliac crest of the body, and the iliac bone It hits only around the ridge. Therefore, even if the auxiliary absorbers 113 and 213 themselves have a thickness, there is little or no influence of the upper anterior iliac spine and the iliac crest ridges, so that it is difficult for gaps to occur around the auxiliary absorbers 113 and 213. Leakage is difficult to occur, and the portion having the auxiliary absorbers 113 and 213 is difficult to shift. Furthermore, since the auxiliary absorbers 113 and 213 do not press the upper anterior iliac spine and the iliac crest, it is possible to effectively prevent pressure ulcers caused by the auxiliary absorbers 113 and 213. Moreover, the fit of other parts and the feeling of wearing are not impaired.

  In the pants-type disposable diaper, providing the waist elastic member 24 and the waist elastic member 25 as described above has been conventionally performed. However, when providing the elastic members 24 and 25 along the width direction, the elastic member If 24 and 25 cross the auxiliary absorbers 113 and 213, the auxiliary absorbers 113 and 213 may be bent or cracked due to contraction, and the fit and absorption performance of the auxiliary absorbers 113 and 213 may be reduced. . If only this problem is solved by not providing the elastic members 24 and 25 in the region that overlaps the entire auxiliary absorbers 113 and 213, in that case, as the curvature change of the waist surface of the body goes to the side. It becomes large and it is easy to produce a clearance gap on the outer side in the width direction of the auxiliary absorbers 113 and 213. Therefore, as shown in the figure, the waist elastic member 25 is at least in the same longitudinal range as the front auxiliary absorber 113, and is located in the middle region between the front auxiliary absorbers 113 and outside in the width direction of the front auxiliary absorber 113. In the side region from the end of the side seal portion 21 to the side seal portion 21 and not between the intermediate region and the side region, and at least in the same longitudinal range as the rear auxiliary absorber 213, both rear auxiliary absorptions Proposed form is provided in the intermediate region between the bodies 213 and in the side region from the outer end in the width direction of the rear auxiliary absorber 213 to the side seal portion 21 and not between the intermediate region and the side region. Is done. According to such an elastic member arrangement, the contraction force acts only on the outer ends in the width direction of the auxiliary absorbers 113 and 213, so that it is difficult for a gap to be generated on the outer sides in the width direction of the auxiliary absorbers 113 and 213. However, the auxiliary absorbers 113 and 213 are not easily bent or cracked due to the contraction.

  The area where the auxiliary absorbent bodies 113 and 213 are provided can be determined as appropriate, but in the vertical direction, from the same position as the flat fixing portion 18 of the three-dimensional gather 17 (or the crotch side), the vicinity of the waist elastic member 24 In the width direction, the range from the vicinity of the side edge of the main interior body 10 to the vicinity of the side seal portions 21 and 22 is preferable. As a result, as shown by the two-dot chain line arrow in FIG. 1, the excrement leaked through the flat fixing portion 18 (the portion where leakage easily occurs) of the three-dimensional gather 17 contacts the auxiliary absorbers 113 and 213. This makes it easy to prevent leakage.

  However, in the case where the curved elastic member 28 as described above is provided in order to improve the fit to the heel portion or the ridge groove, if the auxiliary absorbers 113 and 213 are provided on the passing position of the curved elastic member 28, the curved elastic member is provided. In addition to the lowering of the fit by 28, the auxiliary absorbent bodies 113 and 213 may be bent or cracked due to the shrinkage, and the fit and absorption performance of the auxiliary absorbent bodies 113 and 213 may be lowered. Therefore, as shown in FIG. 9, it is preferable that the auxiliary absorbers 113 and 213 are not provided in a portion overlapping the curved elastic member 28 (a portion overlapping the curved elastic member 28 may be a thin portion). In this case, the shape of the outer edges in the width direction of the auxiliary absorbers 113 and 213 may be curved along the curved elastic member 28. However, since manufacturing becomes difficult, as shown in FIGS. 9 and 10B. In addition, a plurality of rectangular auxiliary absorbers 113 and 213 that are simple and easy to manufacture are used, and the positions of the corners on the outer side in the width direction and between the crotch sides in each of the auxiliary absorbers 113 and 213 while avoiding a portion overlapping the curved elastic member 28. It is also a preferable form to arrange so that is along the curved elastic member 28.

  As can be seen from this example, only one auxiliary absorber 113, 213 can be provided in each side region, and a plurality of auxiliary absorbers 113, 213 can be provided. In the latter case, as shown in FIG. 9 and FIG. A plurality of auxiliary absorbers 113 and 213 are arranged at intervals so that non-absorber portions 113X, 113Y, and 213X are formed on the upper anterior iliac spine contact portion and the iliac crest contact portion. Thereby, it can also be set as the form which does not provide the auxiliary absorbers 113 and 213 in the upper anterior iliac spine contact part and the iliac crest contact part.

  The present invention can be used in a pants-type disposable diaper as in the above example.

  DESCRIPTION OF SYMBOLS 1 ... Pants type disposable diaper, 10 ... Main interior body, 11 ... Liquid permeable surface sheet, 12 ... Liquid impervious back side sheet, 13 ... Absorber, 14 ... Packaging sheet, 15 ... Gathered nonwoven fabric, 16 ... Yarn elastic Elastic member, 20 ... exterior sheet, 21/22 ... side joint edge, 24 ... waist elastic member, 25 ... waist elastic member, 26 ... dorsal curved elastic member, 28 ... ventral curved elastic member, 29 ... leg Circumference line, 20C ... exterior sheet folded portion, 70 ... intersection, 71 ... non-fixed area, 80, 81, 82 ... fixed area, 100 ... front auxiliary interior body, 113 ... front auxiliary absorber, 200 ... rear auxiliary Inner body, 213 ... rear auxiliary absorber, θ ... longitudinal crossing angle, F ... front body, B ... rear body.

Claims (7)

An exterior sheet having a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, and the front body and the back body of the exterior sheet are joined at side seal portions on both sides By doing so, a waist opening and a pair of left and right leg openings are formed,
Of the inner surface of the front body, the front auxiliary absorbent body is provided in a front side region including both sides of the front end portion of the inner body in the width direction and including the upper anterior iliac spine contact portion and the periphery thereof, In pants-type disposable diapers,
In the front auxiliary absorber, a part of the front side region including the upper anterior iliac spine contact portion is a thin portion, or the upper front iliac spine in the front side region. It is not provided for a part including the contact part,
A pants-type disposable diaper characterized by that. Among the inner surfaces of the back body, the back auxiliary absorbent body is provided in the rear side region including the width direction both sides of the rear end portion of the interior body and including the iliac crest contact portion and the periphery thereof,
In the rear auxiliary absorber, a part including the iliac crest contact part in the rear side region is a thin part, or a part including the iliac crest contact part in the rear side region Is not provided for,
The pants-type disposable diaper according to claim 1. Both the front body and the back body are each provided with a curved elastic member that extends while curving toward the opposite body side as it goes from both side seal portions toward the center in the width direction,
The front auxiliary absorber and the rear auxiliary absorber are not provided in a portion that overlaps the curved elastic member, or a portion that overlaps the curved elastic member,
The pants-type disposable diaper according to claim 2. In both the front body and the back body, a plurality of elongated waist elastic members extending along the width direction are provided at the edges of the waist opening at intervals in the vertical direction. A plurality of elongate waist elastic members extending along the width direction are provided in the longitudinal direction center portion side than the front elastic member, with a space in the vertical direction,
The waist elastic member and the waist elastic member are at least in the same longitudinal direction range as the front auxiliary absorber, and are located in the middle region between the two front auxiliary absorbers and from the outer end in the width direction of the front auxiliary absorber. It is provided in the side region up to the seal portion, and is not provided between the intermediate region and the side region, and at least in the same longitudinal range as the rear auxiliary absorber, between the two rear auxiliary absorbers The intermediate region and the rear auxiliary absorber are provided in the side region from the outer end in the width direction to the side seal portion, and are not provided between the intermediate region and the side region,
The pants-type disposable diaper according to claim 3. A plurality of rectangular front auxiliary absorbers are provided at intervals in each anterior side region, and the interval portion is configured to be the upper anterior iliac spine contact portion,
A plurality of rectangular rear auxiliary absorbers are provided at intervals in each of the posterior side regions, and the interval portions are configured to be the iliac crest contact portions.
The pants-type disposable diaper according to claim 4. In each of the front side regions, a plurality of rectangular front auxiliary absorbers having different widths are juxtaposed in the vertical direction, or a plurality of rectangular front auxiliary absorbers having different vertical lengths. Are arranged side by side in the width direction, and each front auxiliary absorber is arranged so that the position of the corner portion on the outer side in the width direction and the crotch side of each front auxiliary absorber is along the curved elastic member,
In each of the rear side regions, a plurality of rectangular rear auxiliary absorbers having different widths are arranged in the vertical direction, or a plurality of rectangular rear auxiliary absorbers having different vertical lengths are arranged in the width direction. The rear auxiliary absorbers are arranged so that the positions of the corners on the outer side in the width direction and the crotch side of the rear auxiliary absorbers are along the curved elastic member.
The pants-type disposable diaper according to claim 4 or 5. A solid gather covering the entire front-rear direction is provided on both sides in the width direction of the interior body. The solid gather is fixed in a state where both front and rear ends are flatly folded, and a portion between these is gathered on the body side. Is configured to protrude
The pants-type disposable according to claim 6, wherein the auxiliary absorbent body is attached to the inner surface of the exterior sheet as an auxiliary interior body interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet. Diapers.

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