JP6504599B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper having improved ability to follow the movement of a wearer.

  For example, a pants-type disposable diaper includes an exterior body extending from the ventral side to the crotch and to the dorsal side of the wearer, and an interior body including an absorber provided on the exterior body, the ventral side of the exterior body A waist opening and a pair of left and right leg openings are formed by joining the side edges of the outer side and the opposite side edges of the back side of the exterior body, and if necessary, both sides of the surface of the inner body It is common that a solid gather that protrudes to the body side is formed.

  Further, in the pants type disposable diaper, in order to improve the fit to the body, various elastic members such as a waist elastic member, a waist lower elastic member, a bending elastic member, etc. are fixed in an extended state to the exterior body. The thing is done.

  However, this kind of elastic member is effective in improving the fit to the body, but the posture of the wearer is, for example, when the person wearing a circular back wears or takes an anteversion posture, the back side In order to solve the problem that the length is short and the back is excessively exposed, Patent Document 1 proposes forming a longitudinal tack along the width direction in the back side portion.

JP 2012-239555 A

  In the invention of Patent Document 1, attention is focused only on the dorsal side, and no consideration on the ventral side is made.

  However, when a person with a circular back wears or takes a forward-looking posture, there are excess lengths on the ventral side, which may make the eyelids more likely or swell, and it is necessary to improve wearability. is there. Also, the followability due to the change in posture is not high.

  Therefore, a main object of the present invention is to provide a disposable diaper having improved wearability and enhanced followability due to a change in posture.

  According to the present invention which solved the above-mentioned subject, a crotch part, a ventral part and a back part are formed, and the disposable diaper provided with the absorber which extends to a ventral part and a back part via the crotch part is provided. A disposable diaper is provided in which a tack in the front-rear direction along the width direction is formed on the ventral portion and the dorsal portion.

  In such a disposable diaper, since at least the ventral portion and the dorsal portion have tacks in the front-rear direction along the width direction, the wearability on the ventral side is improved, and follow-up on the ventral side due to a change in posture. Sex is increased.

  When a plurality of tacks on the dorsal side and a tacky on the ventral side are formed, the extension followability is enhanced compared to the single case, and the unit tack (in the front-rear direction) with respect to the required extension amount It becomes short and clean in appearance.

The required degree of extension was found to be large in the dorsal part and small in the ventral part. Therefore, it is desirable that the longitudinal extension amount of the tuck on the ventral-side portion be smaller than the longitudinal extension amount of the tuck on the back-side portion.
In this case, adjustment of the extension amount can be performed by adjusting the number of tacks in addition to adjusting the longitudinal length of the tack. That is, the unit tack cost of the ventral portion can be smaller than the unit tack cost of the dorsal portion.

A configuration is also proposed in which the area near the fold in at least one of the tack on the back side and the tack on the ventral side is low in stiffness, and the front and back areas sandwiching the fold near area are high in stiffness.
With such a configuration, the area near the fold line is low rigidity, so it bends easily, and the area before and after the area near the fold area is high rigidity, so it becomes difficult to bend. As a result, it bends properly at the crease and unnecessary points There is no occurrence of unevenness due to bending at

The longitudinal length can be made shorter than the center side at the widthwise end of the high rigidity region.
In the pants-type disposable diaper, as described above, the ventral side edge of the exterior body and the back side edge of the exterior body are joined, so the rigidity is large near the side edge, and the product The amount of expansion / contraction (in the front-rear direction) due to the posture change is small at both side portions, and is large at the center in the width direction.
Therefore, by shortening the longitudinal length at the width direction end of the high rigidity region from the center side, it is possible to prevent an increase in excessive rigidity at both sides of the product and a decrease in wearability associated therewith.

The disposable diaper according to claim 1, wherein a rubber thread is provided along a fold line in at least one of the tack of the back portion and the tack of the ventral portion.
The presence of a rubber thread along the fold facilitates forming the fold.

A disposable diaper comprising an absorbent body which is formed with a crotch portion, a ventral portion and a dorsal portion, and which extends through the crotch portion to the ventral portion and the dorsal portion, the disposable diaper comprising an exterior sheet, It is possible to adopt a form in which a tack in the front-rear direction along the width direction is formed on at least the ventral side portion and the back side portion of the exterior sheet.

Since this form forms a tack on the exterior sheet, the formation of the tack is easy as compared with the embodiment in which the thick and slightly rigid inner body including the absorber is formed with a tack.

The fold of the exterior sheet in at least one of the tack on the back side and the tack on the ventral side is a mountain fold as viewed from the outer surface side, and the fold side is the border of the mountain fold, with respect to the outer surface side It is possible to adopt a form in which interlocking means are provided to enhance the connection between the opposite inner surfaces.
In this form, the breakage of the fold is less likely to occur by the connecting means.

  As described above, according to the present invention, advantages such as improved wearability and improved followability due to changes in posture are provided.

It is a top view (inner surface side) of the underpants type disposable diaper of an unfolded state. It is line 2-2 in FIG. 1 sectional drawing. It is line 3-3 in FIG. 1 sectional drawing. It is line 4-4 in FIG. 1 sectional drawing. It is a perspective view of the wearing state of a pants type disposable diaper. It is an expansion outline perspective view of the exterior body of pants type disposable diaper. It is a front view of the example of formation of a tack. It is a front view of other examples of formation of a tack. It is a perspective view for explanation of another example of formation of a tack. (A)-(c) is an explanatory view of various tack forms.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings. In addition, the dot pattern (grey display) part in the figure has shown joining means, such as a hot-melt-adhesive agent.

  First, after explaining the example of the underpants type disposable diaper shown in FIGS. 1 to 5 which does not form the tack according to the present invention, the example of formation of the tack according to the present invention will be described with reference to FIG. .

<Example of disposable diaper>
The pants-type disposable diaper (hereinafter, also simply referred to as a diaper) shown in FIGS. 1 to 5 has an exterior body 20 forming an outer surface of a front body F and a rear body B, and an outer body extending from the front body F to the rear body B The inner body 10 is fixed to the inner surface of the body 20, and the inner body 10 is formed by interposing the absorber 13 between the liquid-permeable surface sheet 11 and the liquid-impermeable back side sheet 12 It is.

  In the production, after the back surface of the inner body 10 is joined to the inner surface (upper surface) of the outer body 20 by a bonding means such as a hot melt adhesive, the inner body 10 and the outer body 20 are front body F and rear body B The waist opening and the left and right pair are folded by being folded at the center in the front and back direction (longitudinal direction) which is the boundary, and the both side portions are mutually joined by heat welding or hot melt adhesive etc. It becomes a pants type disposable diaper in which a leg opening was formed.

(Example of the structure of the interior body)
As the inner body 10, a known one can be adopted, but as an example of its structure, as shown in FIGS. 2 to 4, the liquid-impermeable back sheet 11 made of non-woven fabric etc. and liquid-impermeable back surface made of polyethylene etc. It has a structure in which an absorber 13 is interposed between the sheet 12 and the sheet 12, and absorbs and holds the excretory fluid that has passed through the surface sheet 11. The overall planar shape of the inner body 10 is not particularly limited, but can be substantially rectangular as shown in the illustrated embodiment.

  As the liquid-permeable surface sheet 11 which covers the surface side (skin contact surface side) of the absorber 13, a non-porous or non-porous non-woven fabric, a porous plastic sheet, or the like is suitably used. The material fibers constituting the non-woven fabric may be synthetic fibers of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc., regenerated fibers such as rayon or cupra, or natural fibers such as cotton. Nonwoven fabrics obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a meltblown method, a needle punch method or the like can be used. Among these processing methods, the spunlace method is excellent in flexibility and drapability, and the thermal bonding method is excellent in bulk and softness. 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 extends to the back side of the absorber 13 by winding the side edge portion of the absorber 13.

  The liquid-impervious back side sheet 12 covering the back side (non-skin contact side) of the absorbent 13 is made of a liquid-impervious plastic sheet such as polyethylene or polypropylene. Those having moisture are preferably used. This water-impervious and moisture-permeable 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 it in a uniaxial or biaxial direction. is there.

The absorbent 13 is a known one, for example, a pile of pulp fibers, an aggregate of filaments such as cellulose acetate, or a non-woven fabric, and is formed by mixing and fixing a superabsorbent polymer as necessary. Can be used. The absorbent body 13 can be packaged by a packaging sheet 14 having liquid permeability and liquid holding property, such as crepe paper, as necessary, for shape and polymer holding.
The entire shape of the absorbent body 13 is formed in a substantially hourglass shape having a narrow portion 13N narrower in the crotch portion than in the front and rear sides, but it may be an appropriate shape such as a rectangular shape.

  On both sides of the interior body 10, solid gathers BS fitted around the legs can be formed. As shown in FIGS. 3 and 4, the solid gather BS has a fixed portion fixed to the side of the back surface of the inner body, and a side portion of the surface of the inner body passing the side of the inner body from the fixed portion. Body extending to the bottom, a falling portion formed by fixing the front and rear ends of the main portion to the side of the surface of the interior body in a falling state, and a free portion formed by fixing the portion between the falling portions The part is formed of a gather non-woven fabric 15 which is a double sheet by folding back.

  Further, between the double sheets, an elongated gathers elastic member 16 is disposed at the tip end portion of the free part or the like. The gather elastic member 16 is for forming a solid gather BS by raising the portion of the non-woven fabric protruding from the side edge of the absorber by an elastic stretch force as shown by a two-dot chain line in FIG. 3 in the product state.

  The liquid-impervious back side sheet 12 penetrates to the inside of the double sheet-like gather non-woven fabric 15, and as shown in FIG. 3, a leak-proof wall is formed on the lower end side of the solid gather BS. . As this liquid-impervious back side sheet 12, it is desirable to use an opaque sheet so as to prevent browning such as defecation and urine. As the opacification, a film formed by internally adding a pigment such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc, barium sulfate or the like into a plastic and using it as a film is preferably used.

  As the gather elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, etc. which are usually used can be used. As the gather elastic member 16, in addition to a thread as shown in the illustrated embodiment, a tape-like member having a certain width can also be used.

  Similarly to the liquid-permeable surface sheet 11, the raw material fibers constituting the above-mentioned gather non-woven fabric 15 are synthetic fibers such as olefins, polyesters, and amides such as polyethylene or polypropylene, regenerated fibers such as rayon and cupra, and cotton Etc., and non-woven fabrics obtained by an appropriate processing method such as spun bond method, thermal bond method, meltblown method, needle punch method can be used, but in particular, in order to prevent moisture It is preferable to use a non-woven fabric having a low basis weight and excellent breathability. Furthermore, as for the gather non-woven fabric 15, in order to prevent the permeation of urine and the like, to prevent run-out and to improve the feel (dry feeling) to the skin, silicon-based, paraffin metal-based, alkylchromic croid-based water repellent etc. It is desirable to use a water repellent treated non-woven fabric coated with.

(Example of structure of exterior body)
The exterior body 20 has a two-layer structure consisting of a holding sheet 20A and a back sheet 20B, each of which is made of non-woven fabric or the like, as also shown in FIGS. 2 to 4, between the holding sheet 20A and the back sheet 20B, and Various elastic members are disposed between the nonwoven fabrics of the folded portion 20C formed by folding the sheet 20B to the inner surface side at the waist opening edge, and stretchability is imparted. The planar shape is generally in the shape of a pseudo hourglass due to the concave leg-surrounding lines 29 formed to form the leg openings on both sides in the middle. In order to reduce the cost and improve the air permeability of the crotch, the presser sheet 20A and the back sheet 20B are divided into two in the front and back, and both are arranged to be separated at the crotch, or the presser sheet 20A and the back One of the sheets 20B may be divided into two in the front-rear direction, and the divided sheets may be arranged to be separated at the crotch portion, and the sheet at the crotch portion may be configured as one sheet.

  In the case 20 of the illustrated embodiment, as elastic members, in the unfolded shape shown in FIG. 1, the waist elastic member 24 disposed in the vicinity of the waist opening 23, the front body F and the back body B longitudinally A plurality of waist lower portion elastic members 25 disposed along the width direction at intervals, and each of the front body F and the back body B separately from the waist lower portion elastic member group 25, one side From the seal 21 along the one leg opening towards the crotch, across the crotch and curved along the other leg opening in a pattern leading to the other side seal 21, A plurality of curved elastic members 26 and 28 are disposed at intervals without crossing. Each of the elastic members 24 to 28 is fixed in a state of being stretched at a predetermined extension rate along the extending direction. In the present exterior body 20, although a so-called elastic elastic member is not provided which continues from the side seal portion of the front body F to the side seal portion of the rear body B along the leg circumference line 29, it may be provided. (Not shown).

  The waist elastic member 24 has a plurality of thread rubbers and the like arranged longitudinally spaced in the vicinity of the waist opening edge within the range of the side seal portion 21 where the front body F and the back body B are joined. It is an elongated elastic member for attaching the diaper to the body by applying a stretching force so as to tighten the waist of the body. Although a rubber thread is used as the waist portion elastic member 24 in the illustrated example, a tape-like stretchable member may be used, for example. Although the waist elastic member 24 in the illustrated embodiment is held between the nonwoven fabrics of the folded portion 20C of the back sheet 20B in the waist portion, it may be held between the pressing sheet 20A and the back sheet 20B.

  The waist lower portion elastic member 25 is an elongated elastic member such as thread rubber which is disposed at intervals in the longitudinal direction over the range from the upper portion to the lower portion in the side seal portion 21 and has a front body F and Stretching force in the width direction is given to the waist circumference portion of the back body B to make the diaper adhere closely to the body. The boundary between the waist elastic member 24 and the lower waist elastic member 25 may not necessarily be clear. For example, among the elastic members arranged in the width direction at intervals in the longitudinal direction on the front body F and the back body B, although the number can not be specified, some of the upper side functions as a waist elastic member The remaining elastic members only have to function as waist lower elastic members.

  In the back body B, the back curved elastic member 26 disposed separately from the lower waist elastic member 25 is an elongated elastic member such as thread rubber, and is disposed along a predetermined curve. The back curved elastic member 26 may be one, but preferably a plurality of back elastic elastic members such as four thread rubbers in the illustrated example, these back curved elastic members 26 They are spaced apart without crossing. Three or more, preferably four or more back side curved elastic member groups 26 are arranged at intervals to form a predetermined expansion and contraction zone.

  In the front body F of the exterior body 20, the ventral-side curved elastic member 28 disposed separately from the waist lower portion elastic member group 25 is an elongated elastic member such as thread rubber, and is disposed along a predetermined curve There is. The ventral-side curved elastic member 28 may be one, but preferably a plurality, and in the illustrated example, four thread-like elastic members, and the ventral-side curved elastic members 28 do not cross each other. , Are spaced apart. The ventral-side curved elastic member group 28 is also disposed three or more, preferably four or more, at intervals to form a predetermined stretch zone.

  Unlike the illustrated example, the curved elastic members 26 and 28 may be provided only on one of the front body F and the back body B. When the curved elastic members 26 and 28 are provided on both the front body F and the back body B, they are disposed on the rear body B side with part or all of the group of the curved elastic members 28 disposed on the front body F side. Although a form (not shown) in which a part or all of the group of curved elastic members 26 intersects may be adopted, a group of curved elastic members 28 disposed on the front body F side as in the illustrated example; It is preferable that the groups of the curved elastic members 26 disposed on the rear body B side are separated in the longitudinal direction at a position slightly biased to the front-rear direction intermediate portion, in particular, the front body F without intersecting each other.

  Furthermore, the curved elastic members 26 and 28 may not be curved as a whole, and may have partially linear portions.

(Front and back presser sheet)
As shown in FIG. 2, in order to cover the front and rear ends of the inner body 10 mounted on the inner surface of the outer body 20 and to prevent leakage from the front and rear edges of the inner body 10, It is provided. More specifically, the front pressing sheet 50 extends across the entire width from the inner surface of the folded portion 20C of the front end of the front body F to the front end of the inner body 10 in the front body F The back pressing sheet 60 extends over the entire width direction from the inner surface of the folded portion 20C of the waist end of the rear body B to a position overlapping the rear end of the inner body 10. If some non-adhered parts are provided on the crotch side edge of the front and back holding sheets 50 and 60 over the entire width direction (or only the central part), not only the adhesive will not come out, but also this part from the top sheet It can be floated a little to function as a leak barrier.

  If the front and rear pressing sheets 50 and 60 are separately attached as in the illustrated embodiment, there is an advantage that the degree of freedom in material selection is increased, but there are disadvantages such as an increase in materials and manufacturing processes. Therefore, it is possible to form a portion equivalent to the above-described pressing sheets 50 and 60 by extending a folded portion 20C formed by folding the exterior body 20 to the inner surface of the diaper to a portion overlapping the interior body 10.

  As described above, when the fitting elastic members 25, 26, 28 are provided on the exterior body 20 of the underpants-type disposable diaper, at least the widthwise middle portion of the region overlapping the interior body 10 is finely cut to eliminate unnecessary interior body 10. It is preferred to prevent contraction.

<Formation form of tack>
Next, an example of forming a tack according to the present invention will be described with reference to the drawings after FIG.
In addition, in the drawings after FIG. 6, it is noted in advance that illustration of constituent members such as an elastic member and an absorber is omitted.

The front and back are divided into a front body F and a back body B in FIG. 1, but it is also possible to divide the middle part in the front-rear direction from the crotch part, the front side from it, the ventral side part, and the rear side from the back side part. Moreover, the area | region between the side seal parts 21 and 21 before and behind can also be called a crotch part. In the present invention, it does not make much sense to precisely define, distinguish and refer to these.
Rather, when forming a tack, which will be described later, it is desirable to form it in a region that can be easily deformed in the exterior body 20, the area from the front-rear direction edge to the waist opening edge of the absorbent 13 is referred to as the "sheet area". Is convenient.
Therefore, in the example of tack formation shown in the drawings after FIG. 6, it should be understood that the tack is formed in the “sheet area” of the exterior body 20.
It also includes both those that merely crease the crease and those that secure it. Therefore, "tack" in the present invention is meant to include pleats.

  According to the present invention, a disposable diaper is provided in which tacks 30F and 30B in the front-rear direction along the width direction are formed on at least the ventral portion and the dorsal portion.

In the example shown in FIGS. 5 and 6, the front tack 30F and the rear tack 30B are formed at appropriate positions in the "sheet area" of the exterior body 20 from the front-rear direction end edge of the absorber 13 to the waist opening edge. is there.
Furthermore, in the example shown in FIG. 6, the front tack 30F and the rear tack 30B are formed such that the mountain folds of the tack are directed to the center in the front-rear direction.

  In the present invention, a front tack 30F is formed on the front body F, and a rear tack 30B is formed on the rear body B.

  As the form of the front tack 30F or the rear tack 30B, as shown in FIG. 10, form (a) of overlapping while shifting the fold, form (b) of making the fold opposite to each other on the outer side (inner side as viewed from the left in FIG. 10) A mode in which the fold is opposed to the inside (inside as viewed from the left in FIG. 10): A mode (c) in which the "taiko" of the female band is formed on the outside can be appropriately combined and formed.

  Although the number of front tacks 30F or rear tacks 30B may be one, the plurality (without limitation to the number) is more stretchable than the single case, and the unit tack for the required extension amount But it is shorter (in the front-rear direction) and looks clean in appearance.

The required degree of extension was found to be large in the dorsal part and small in the ventral part. Therefore, it is desirable that the longitudinal extension amount of the tuck on the ventral-side portion be smaller than the longitudinal extension amount of the tuck on the back-side portion.
In this case, adjustment of the extension amount can be performed by adjusting the number of tacks in addition to adjusting the longitudinal length of the tack. That is, as shown in FIG. 6, the unit tack margin 30Lf of the front tack 30F can be smaller than the unit tack margin Lb of the rear tack 30.

As shown in FIG. 7, it is also proposed that the area near the fold L in at least one of the front tack 30F and the rear tack 30B is a low rigidity S1 and the front and rear areas sandwiching the fold L be a high rigidity area Sh.
With this configuration, the region near the fold L is easily bent because of low rigidity Sl, and the front and back regions sandwiching the fold L are high rigidity regions Sh, so that it becomes difficult to bend. There is no occurrence of unevenness due to bending or bending at unnecessary points.

The high rigidity area Sh can be formed, for example, by overlapping a non-woven fabric band on the forming sheet of the exterior body 20 and overlapping an elastic film.
According to this, the fold does not collapse or irregular irregularities are not formed, and the fold L appropriately bends.

As shown in FIG. 8, at the width direction end of the high rigidity area Sh, the length in the front-rear direction can be made shorter than the center side.
In the underpants type disposable diaper, since the ventral side edge of the exterior body and the back side edge of the exterior body are joined (for example, joined as the seal portion 21), the rigidity is increased in the vicinity of the side edge In addition, at both sides of the product, the amount of expansion / contraction (back and forth) due to posture change is small and large at the center in the width direction.
Therefore, by shortening the longitudinal length at the width direction end of the high rigidity area Sh from the center side, it is possible to prevent an increase in excessive rigidity at both sides of the product and a decrease in wearability associated therewith.
The high rigidity area Sh shown in FIGS. 7 and 8 may overlap with the seal portions 21 on both sides, and the length in the width direction may be short. Also in the latter case, the widthwise intermediate portion expands and contracts in the front-rear direction, and the effect of the present invention is not lost.

A thread rubber can be provided along (in the width direction) the fold L position in at least one of the front tack 30F and the rear tack 30B.
The presence of the rubber thread along the fold L makes it easy to form the fold.
In this case, the high rigidity area Sh shown in FIGS. 7 and 8 may or may not be formed.

The disposable diaper according to the present invention preferably includes an exterior sheet, and preferably has a form in which a tack in the front-rear direction along the width direction is formed on at least a ventral side portion and a back side portion of the exterior sheet.
In this embodiment, since the tack is formed on the exterior sheet (preferably in the “sheet area”), compared to the aspect in which the tack is formed on the thick and slightly rigid interior body 10 including the absorber 13, Tack formation is easy.
However, this does not exclude the formation of a tack at a position where the exterior body 20 overlaps the interior body 10 (in particular, in the case where the thickness of the absorber is thin and easily deformable, the tack can be formed).

FIG. 9 shows another example. The surface to be viewed is the inner surface and the opposite surface is the outer surface. As shown in FIG. 9, the fold L of the exterior sheet in at least one of the front tack 30F and the rear tack 30B is mountain-folded in a view from the outer surface side, and the outer surface is bounded by the mountain fold-fold L It is possible to adopt a form in which connecting means 31 is provided to enhance the connection between the inner surfaces I and I opposite to the side.
As the connection means 31, when the inner surfaces I and I of the outer covering sheet are stacked, a material which gives the property of being hard to separate can be used.
In this embodiment, the connecting means 31 makes it difficult for the fold L to break.
As an example of the connection means 31, what can be fixed to the composition sheet of an exterior body like the hook material (male material) of a mechanical fastener (surface fastener), an adhesive, etc. can be used. As the pressure-sensitive adhesive, a pressure-sensitive adhesive which is less likely to lower in adhesive force even when being attached to and removed from a non-woven fabric or sheet is preferable.
The connection means 31 can be provided only on one of the inner surfaces I in addition to the inner surfaces I and I, as shown in FIG.

  As already mentioned, examples of various tacks are shown. In addition, in the case where the holding sheet 20A and the back sheet 20B essentially overlap two sheets as the outer package 20, it is possible to form a tack on the two stacked sheets, and it is also possible to essentially form one sheet. In the form (not shown) which forms the exterior body 20 by this, you may form a tack in the sheet | seat of 1 sheet.

  The present invention is applicable to disposable diapers such as pad type, etc. other than the pants type disposable diaper as in the above example.

  B: back body, F: front body, 10: interior body, 11: liquid permeable surface sheet, 12: liquid impermeable back side sheet, 13: absorbent body, 14: packaging sheet, 15: gathered nonwoven fabric, 16: 16 Gather elastic member, 20: exterior body, 20C: folded portion, 21: side seal portion, 24: waist elastic member, 25: waist lower elastic member, 26, 28: curved elastic member, 26: dorsal curved elastic member , 28: ventral curved elastic member, 29: line around leg, 30: tack, 30B: after tack, 30F: before tack.

Claims (6)

An exterior body forming an outer surface of a front body and a rear body, and an interior body fixed to the inner surface of the exterior body so as to extend from the front body to the rear body,
Both sides of the front body and both sides of the rear body in the exterior body are joined to form a side seal portion, and a waist opening, a pair of left and right leg openings, a crotch portion, an abdominal portion and a back portion There is formed, the inner body is in the pants-type disposable diaper having an absorbent body that extends ventral portion and the dorsal portion through the crotch portion,
Longitudinal tacking along the width direction is formed on at least the ventral portion and the dorsal portion of the exterior body up to the side seal portions on both sides ,
An area near the fold in at least one of the tack on the back side and the tack on the ventral area is a low stiffness area, and the front and back areas sandwiching the fold near area are a high stiffness area.
At the width direction end of the high rigidity region, the length in the front-rear direction is shorter than the center side ,
Disposable diapers characterized by   The disposable diaper according to claim 1, wherein a plurality of tacks on the back side portion and a tacky side on the ventral side portion are formed.   The disposable diaper according to claim 1 or 2, wherein a longitudinal extension amount of the tack of the ventral portion is smaller than a longitudinal extension amount of the tack of the back portion. The disposable diaper according to claim 1 , wherein the region of high rigidity extends to a position overlapping the side seal portions on both sides .   The disposable diaper according to claim 1, wherein a rubber thread is provided along a fold line in at least one of the tack of the back portion and the tack of the ventral portion. The fold in at least one of the tack on the back side and the tack on the ventral side is a mountain fold as viewed from the outer surface side, and this fold fold is bounded by the fold.
Opposite inner surface mutual disposable diaper according to claim 1, wherein the interlocking means are provided to increase the connection to the outer surface side.

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