JP5641925B2 - 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, various elastic members are fixed to the exterior sheet in an expanded state (see, for example, Patent Documents 1 to 7). 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.

  However, in the conventional general pants-type disposable diapers, there is a problem that the crotch part is mokomoko unlike ordinary underwear. And according to the study by the present inventors, one of the causes of this problem is that the absorbent body floats from the body in the part from the rupture to the crotch, that is, the fit at the part is insufficient. Met.

  In order to improve the fit of the crack for this problem, there are various forms such as a curved elastic member on the back body arranged so as to protrude convexly toward the waist opening at the crotch crossing part. Although proposed (for example, refer to Patent Documents 8 and 9), the inner surface of the diaper is shaped to fit the crack, but in addition to the problem that it is difficult to maintain the fitted state, when attaching an elastic member in manufacturing, There is also a problem that it is necessary to change the direction of the elastic member to a steep angle, and it is difficult to manufacture the high-speed line.

  Furthermore, as a solution to this problem, on the exterior sheet in the back body, an elongated curved elastic member extending while curving toward the front body side along the edge of the leg opening from both sides, An elongated elastic member is provided that extends in the width direction across the crack-facing portion in the back body, and is fixed in a state of extending in the extending direction. Thus, it was considered to form a bent fitting portion that bends so as to enter the wearer's crack. As a result, even if the curved elastic member is not changed to a steep angle, the bent fit portion for the crack can be formed by the arrangement along the width direction of the crack width direction elastic member, so that it can be stably manufactured by the high-speed line. Become.

JP-A-7-265357 JP-A-7-299094 JP-A-11-36103 JP 2001-258931 A JP 2001-204762 A JP 2006-043415 A Special table 2007-113978 gazette JP 2007-97621 A JP 2008-253289 A JP 2002-209942 A Japanese Patent Laid-Open No. 2005-087622

  However, if the elastic member in the width direction of the cracked portion is simply provided continuously in the width direction, the fitting property on both sides in the width direction of the facing portion of the crack is likely to be insufficient, and the edge of the leg opening in the back body is particularly outward. There was a problem that the side part of the interior body was exposed and deteriorated in appearance.

  Then, the main subject of this invention is providing the underpants type disposable diaper which is excellent in the fitting property in a crack and its width direction both sides, and the edge part of the leg opening part in a back body is hard to bend.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An exterior sheet that forms a front body and a back body, and an interior body including an absorbent body that is fixed to an inner surface of the exterior sheet, and both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body Are joined to form a side seal portion, thereby forming a waist opening and a pair of left and right leg openings,
Side portions extending in the width direction of the crack facing portion of the outer body sheet of the back body overlap side portions overlapping the side portions of the interior body, and lateral extensions extending laterally from the side edges of the interior body. In a pants-type disposable diaper having a part,
From the right side seal part of the back body to the right side overlap part along the edge of the right leg opening part of the back body, so that it goes from the right side part overlap part to the front side while moving further toward the center in the width direction To the crack facing part located at the center in the width direction of the back body, folded back to the crack facing part, and further curved toward the rear side toward the left side and the left side part Leading to the overlapping part, from the left side overlapping part to the left side seal part of the back body along the edge of the left leg opening of the back body; an elongated dorsal curved elastic member in its longitudinal direction While being fixed to the exterior sheet in a state of being stretched at a predetermined stretch rate,
An elongated shape extending from the side edge of one of the laterally extending portions to the side edge of the other laterally extending portion across the crack facing portion and the side overlapping portion on both sides thereof in the width direction. The cracked portion width direction elastic member is fixed to the exterior sheet in a state of being stretched at a predetermined elongation rate in the extending direction,
The back-side curved elastic member and the cracked portion width direction elastic member are only non-contracted portions that are finely cut and do not act on contraction force, only the portion located on the center side in the width direction of the side overlap portion. ,
The cracked portion width direction elastic member includes a main portion located in the crack facing portion, and a boundary portion extending in the vicinity of both sides in the width direction of the boundary between the side overlapping portion and the side extending portion. The edge side portion located on the outer side in the width direction of the portion, and the intermediate portion located between the boundary portion and the non-shrinkable portion are fixed to the exterior sheet at a low elongation rate.
A pants-type disposable diaper characterized by that.

(Function and effect)
In the present invention, among the back-side curved elastic member and the cracked portion width direction elastic member, only the portion located on the center side in the width direction of the side overlapping portion is finely cut and configured not to substantially contract. Therefore, the crack facing part between them becomes a three-dimensional bent fitting part that enters the wearer's crack by the contraction action of the crack part width direction elastic member, and at the center side in the width direction of the side overlapping part In the part, the inner body is shaped to fit the bottom without shrinking unnecessarily. And on the side, the contraction force of the cracked part width direction elastic member acts firmly on the boundary between the side overlapping part and the side extending part and in the vicinity of both sides in the width direction, and the side edge part of the interior body is attached Fits well on the person's butt, and the contraction force acts weakly or substantially does not act on the outer part in the width direction (the contraction force is acting when no contraction force is applied) Therefore, it is difficult for the edge of the leg opening to bend. Therefore, it is excellent in the rupture and fit on both sides in the width direction, and the edge of the leg opening in the back body is difficult to bend. In addition, since the cracked portion width direction elastic member is provided along the width direction, it can be manufactured not only at a low cost but also stably by a high speed line.
In addition, the crack part width direction elastic member is left in the boundary part over the width direction both sides of the main part located in the crack opposing part, and the boundary between the side part overlap part and the side extension part, Even if the portion located on the outer side in the width direction of the boundary portion and the portion located between the boundary portion and the non-contracted portion are cut finely, the above-mentioned dripping prevention effect can be obtained, but the back passing through the portion Since the side-curved elastic member is also cut and the fit may be insufficient, the present invention employs a configuration that is fixed in a loosely stretched state without cutting.

<Invention of Claim 2>
The exterior sheet is formed by bonding an outer layer and an inner layer,
The back-side curved elastic member and the cracked portion width direction elastic member are sandwiched between the outer layer and the inner layer and fixed to the outer layer and the inner layer by a hot melt adhesive,
The amount of hot melt adhesive applied between the outer layer and the inner layer is less in the edge portion and the intermediate portion than in the main portion and the boundary portion,
The pants-type disposable diaper according to claim 1.

(Function and effect)
In this way, the amount of the hot melt adhesive for fixing the back-side curved elastic member and the cracked portion width direction elastic member is set to the edge side portion and the intermediate portion from the main portion and boundary portion of the cracked portion width direction elastic member. By adopting a configuration with fewer parts, only the part located on the center side in the width direction of the side overlapping part in the back side curved elastic member and the cracked part width direction elastic member is finely cut and the leg opening is punched out. By simply cutting the end of the cracked portion width direction elastic member, the edge side portion and the intermediate portion of the cracked portion width direction elastic member are drawn toward the boundary portion and fixed at a lower elongation rate than the boundary portion. become.

<Invention of Claim 3>
A plurality of the back-side curved elastic members and the cracked portion width direction elastic members are provided at intervals, and at least one back-side curved elastic member swells to the front side of the cracked portion width direction elastic member located at the foremost side. It is arranged to put out,
A region on the outer side in the width direction of the dorsal curved elastic member located on the foremost side in the exterior sheet and on the front side of the cracked portion width direction elastic member located on the foremost side is fixed to the interior body. Item 1 or 2 pants-type disposable diaper.

(Function and effect)
In order to pull up the crotch portion backward by the dorsal curved elastic member, a plurality of dorsal curved elastic members and cracked portion width direction elastic members are provided at intervals, and at least one dorsal curved elastic member is the frontmost It is preferable that it is arrange | positioned so that it may bulge to the front side of the crack part width direction elastic member located in this. However, in that case, the region on the outer side in the width direction of the dorsal curved elastic member located on the foremost side of the exterior sheet and the front side region of the cracked portion width direction elastic member located on the foremost side is not fixed to the interior body. In the region, the edge portion of the leg opening portion can be easily rolled outward. Therefore, it is preferable that at least the region is fixed to the interior body to prevent dripping.

  As described above, according to the present invention, there are advantages such as excellent cracking and fitability on both sides in the width direction, and the edge of the leg opening in the back body is difficult to bend.

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 top view which shows an adhesive agent application pattern. It is a top view which shows an elastic member cut pattern. It is a perspective view of the wearing state of a pants type disposable diaper. It is a rear view of the wearing state of a pants type disposable diaper. It is DD sectional drawing of FIG. It is a rear view of the wearing state of the conventional pants type disposable diaper. It is a principal part enlarged plan view (outer surface side) of the underpants type disposable diaper of a deployment state. It is a principal part enlarged plan view (outer surface side) of the underpants type disposable diaper of a deployment state.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The term “elongation rate” means a value when the natural length is 100%.
1-11 has shown the underpants type disposable diaper 1 of embodiment. The pants-type disposable diaper 1 (hereinafter also simply referred to as a diaper) includes an exterior sheet 20 that forms a front body F and a back body B, and an interior body 10 that is fixed and integrated with the inner surface of the exterior sheet 20. The interior body 10 is formed by interposing an absorber 13 between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12. In manufacturing, after the back surface of the interior body 10 is fixed to the inner surface (upper surface) of the exterior sheet 20 by a joining means such as a hot melt adhesive G, the interior body 10 and the exterior sheet 20 are the front body F and the back body. Folded at the center of the vertical direction (front-rear direction) which is the boundary of B, both sides thereof are joined to each other by heat welding or hot melt adhesive, etc., and side seal portions 21 and 22 are formed. 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 two-layer structure sheet in which an inner layer 20 </ b> A and an outer layer 20 </ b> B each made of a nonwoven fabric are bonded together by a hot-melt adhesive, and the outer layer 20 </ b> A and the outer layer 20 </ b> A Various elastic members 24 to 28 are sandwiched and fixed in a stretched state between the nonwoven fabrics of the folded portion 20C formed by folding the outer layer 20B to the inner surface side at the waist opening edge between the layers 20B and imparting elasticity. The planar shape forms a pseudo hourglass shape as a whole by the concave leg opening edges (edges of the leg opening portions) 29 formed to form the leg openings on the both sides of the middle. As the elastic members 24 to 28, synthetic rubber or natural rubber formed into an elongated shape such as a thread shape, a string shape, or a belt shape can be used.

  In particular, in the exterior sheet 20 of the illustrated form, as shown in FIGS. 1 to 3, the waist elastic members 24, 24... Disposed in the vicinity of the waist opening 23 in each of the front body F and the back body B. A plurality of waistline elastic members 25, 25... Disposed at the crotch side relative to the waist elastic members 24, 24... Aside from 25, 25..., The side seal portions 21 and 22 that join the front body F and the back body B are curved so as to go to the opposite body side along the leg opening edge 29 toward the center in the width direction. On the other hand, a plurality of curved elastic members 26, 28,... Are provided which extend to portions overlapping with both side portions of the interior body 10 and are spaced apart from each other. In the exterior sheet 20, the curved elastic members 26, 28... Ensure the fit around the legs, so that the leg circumferences that are substantially continuous from the front body F to the back body B along the leg opening edges 29. Although the elastic member is not provided, it can be provided together with the curved elastic members 26, 28,.

  The waist elastic members 24, 24... Are a plurality of thread rubber-like elastic members arranged in the vertical direction near the waist opening edge in the vertical range having the side seal portions 21, 22. In order to attach the waist opening edge of the diaper to the body by giving an expansion / contraction force so as to tighten around the waist part of the body by being fixed to the exterior sheet in an extended state in the extending direction (width direction of the diaper) belongs to. 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 outer layer 20B in the waist, but may be sandwiched between the inner layer 20A and the outer layer 20B. good.

  The waist elastic members 25, 25... Are spaced vertically in the vertical range corresponding to the side seal portions 21, 22 and the range from the crotch side to the upper side to the lower side. And is an elongated elastic member such as rubber thread disposed along the width direction, and is fixed to the exterior sheet in an extended state in the extending direction (width direction of the diaper), so that the front body F and the back body Each of the waist portions of B is given a stretching force in the width direction so that the diaper is in close contact with the body. Note that 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 It is arranged along a predetermined curve having a crossing portion 70 having a vertical crossing angle θ of 60 ° or less in a region overlapping with both side portions of the interior body 10 in a state where the diaper is developed. It is fixed to the exterior sheet in a stretched state in the direction. 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. Plural or more are arranged at predetermined intervals.

  In the front body F, the abdomen curved elastic members 28, 28... Arranged separately from the waist elastic members 25, 25... Have a minimum longitudinal crossing angle .theta. The interior body 10 has a minimum point and a predetermined curve in which the longitudinal crossing angle θ increases within a range of 0 degrees to 90 degrees from the minimum point toward both sides in the width direction, and the diaper is unfolded. It is arranged along a predetermined curve having a crossing portion 70 having a vertical crossing angle θ of 60 ° or less in a region overlapping with both side portions, and is fixed to the exterior sheet in an extended state in the extending direction. Has been. The ventral curved elastic members 28, 28... May be one, but preferably a plurality. The illustrated example is five thread-like elastic members, and these ventral curved elastic members 28, 28. They are arranged at intervals without crossing each other. The ventral curved elastic member groups 28, 28,... Are not substantially arranged as a bundle with a few intervals between the two or three elastic elastic members so as to form a predetermined elastic zone. Plural or more are arranged at predetermined intervals.

  The curved elastic members 26, 28,... May not be entirely curved as in the illustrated example, and may partially have a linear portion. 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 intersects with the crotch part or in the vicinity of the front side or the rear side thereof can be adopted, as shown in the illustrated example, on the front body F side. The group of curved elastic members 28 arranged and the group of curved elastic members B arranged on the back body B side do not cross each other in the longitudinal direction, particularly at a position slightly deviated from the front body F. The separated form is preferable, and the longitudinal separation distance is preferably about 10 to 20 mm.

  On the other hand, in the illustrated example, the waist elastic members 25, 25... And the curved elastic members 26, 28... Disposed in the front body F and the back body B are not provided in a portion crossing the interior body 10. This portion is a non-stretchable region. Thus, the form which does not have or is not provided with the elastic member includes the form in which the elastic member is present, but also the form in which the elastic member is present but is finely cut to the extent that the contraction force does not act. FIG. 8 shows the latter example, in which the waist elastic members 25, 25... And the curved elastic members 26... 28 are crossed from the side seal portion 22 on one side across the interior body 10 and on the other (opposite) side. After the side seal portion 22 is continuously provided, a part or the whole of the portion crossing the interior body 10 is cut by a predetermined cutting pattern CP so as to be discontinuous. By making the elastic members 25, 26 and 28 discontinuous at the portion overlapping the interior body 10, shrinkage in the width direction of the interior body 10 (particularly the absorber 13) can be prevented. Of course, the waist elastic members 25, 25... Can be continuously arranged across the interior body 10.

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

(Bent fit part)
As shown in detail in FIG. 13 and FIG. 14, the exterior sheet 20 includes a side overlapping portion 41 where portions on both sides in the width direction of the crack facing portion of the exterior sheet 20 of the back body B overlap with the side portions of the interior body 10. And a laterally extending portion 42 extending laterally from the side edge 10e of the interior body 10, and the back-side curved elastic member 26 extends from the right side seal portion of the back body B to the back body B To the right side overlapping portion 41 along the right leg opening edge 29, and further curved toward the front side while moving further toward the center side in the width direction from the right side overlapping portion 41 in the width direction of the rear body B It reaches the crack facing part located in the central part, is folded back to the rear side at the crack facing part, is further curved toward the left side toward the left side, and reaches the left side overlapping part 41, and is on the left side. The left leg opening edge 29 of the back body B from the overlapping part 41 It is fixed so as to reach the side seal portion of the left back body B along.

  Also, an elongated shape that extends from the side edge of one side extending portion 42 to the side edge of the other side extending portion 42 across the crack opposing portion and the side overlapping portions 41 on both sides thereof in the width direction. The elastic member 2727 in the width direction of the cracked portion is fixed to the exterior sheet 20 in a state of being stretched at a predetermined elongation rate in the extending direction.

  In the crack-opposing portion, the back-side curved elastic member 26 and the cracked-portion width direction elastic member 27 are finely divided by a predetermined cutting pattern CP only at the portion located on the center side in the width direction of the side overlap portion 41. The cracked portion width direction elastic member 27 is cut to be a non-shrinkable portion 43 on which no contractile force acts, and a main portion 44 located on the crack-opposing portion, a side overlapping portion 41 and a side extending portion. 42, an edge side portion 46 located on the outer side in the width direction of the boundary portion 45, and an intermediate portion 47 located between the boundary portion 45 and the non-shrinkable portion 43. Is fixed to the exterior sheet 20 at a low elongation rate.

  In the pants-type disposable diaper configured as described above, only the portion located on the center side in the width direction of the side overlapping portion 41 of the back side curved elastic member 26 and the cracked portion width direction elastic member 27 is finely cut. Since it is a portion that does not substantially contract, the crack-opposing portion between them enters into the wearer's crack due to the contracting action of the crack width-direction elastic member 27 as shown in FIGS. The shape (the inner surface of the diaper is raised in a ridge shape) is a bent fitting portion 40, and the inner body 10 fits to the bottom without unnecessarily shrinking in the central portion in the width direction of the side overlap portion 41. Become. On the side thereof, the contraction force of the cracked portion width direction elastic member 27 acts firmly on the boundary between the side overlapping portion 41 and the side extending portion 42 and in the vicinity of both sides in the width direction so that the inner body 10 side The edge fits well to the wearer's buttocks, and the shrinkage force acts weakly or substantially does not act on the outer part in the width direction (the state where the shrinkage force does not act at all, (Including a state where it is acting but not contracted), it is difficult for the edge of the leg opening to bend. Therefore, it is excellent in the rupture and fit on both sides in the width direction, and the edge of the leg opening in the back body B is difficult to bend. Moreover, since the cracked portion width direction elastic member 27 is provided along the width direction, it can be manufactured not only at a low cost but also stably by a high-speed line.

  Although the elongation rate of each part of the crack part width direction elastic member 27 can be determined as appropriate, the main part 44 and the boundary part 45 are preferably 200 to 240%, and the edge part 46 and the intermediate part 47 are 100 to 140. % Is preferable.

  The method for attaching the cracked portion width direction elastic member 27 having such a difference in elongation rate is not particularly limited, but when manufactured using existing technology, it is preferably applied as shown in FIGS. That is, when the cracked portion width direction elastic member 27 is supplied at a higher elongation rate and fixed to the exterior sheet 20, the amount of hot melt adhesive G2, G3 applied between the outer layer 20B and the inner layer 20A is set. The edge portion 46 and the intermediate portion 47 are less than the main portion 44 and the boundary portion 45, and thereafter, the side overlapping portion 41 of the dorsal curved elastic member 26 and the cracked portion width direction elastic member 27 is reduced. A method is proposed in which only the portion located on the center side in the width direction is finely cut and the end of the crack width direction elastic member 27 is cut by punching the leg opening. Thereby, while the main part 44 and the boundary part 45 of the crack part width direction elastic member 27 are fixed with respect to the exterior sheet 20 by the elongation rate at the time of supply by hot-melt adhesive G2, G3 of sufficient application quantity, As a result of the edge-side portion 46 and the intermediate portion 47 of the crack width-direction elastic member 27 being weakly fixed by the hot-melt adhesive G3 with a small coating amount, the edge-side portion 46 and the intermediate portion 47 are contracted to some extent and drawn toward the boundary portion 45. It becomes fixed at a lower elongation rate. The crack part width direction elastic member 27 can be attached at the same time by the same method as the waist elastic member 25 except that the hot melt adhesive G2 is intermittently applied.

  The method for providing the difference in the application amount of the hot melt adhesive is not particularly limited. As will be described later, when fixing the cracked portion width direction elastic member 27 to the exterior sheet 20, the cracked portion width direction elastic member 27 is attached to the outer periphery thereof. When the method of directly applying the hot melt adhesive G2 to the surface and then fixing to the exterior sheet 20 is adopted, the hot melt adhesive G2 is intermittently applied in the longitudinal direction of the cracked portion width direction elastic member 27. (In other words, the hot melt adhesive G2 is applied to the portions to be the main portion 44 and the boundary portion 45, and the hot melt adhesive is not applied to the portions to be the edge side portion 46 and the intermediate portion 47). A difference in the amount of melt adhesive applied, and thus the above-described difference in elongation can be achieved.

  Although the width of each part can be determined as appropriate, in the normal case, the width of the crack facing part is about 0.15 to 0.40 times the width 10X of the interior body 10, and the side overlapping portion 41 is the width of the interior body 10. 10X is about 0.05 to 0.20 (only on one side), the laterally extending portion 42 is about 0.05 to 0.35 (only on one side), and the non-shrinkable portion 43 is on the interior. The width 10X of the body 10 is about 0.25 to 0.40 times (one side only), the main portion 44 is about 0.10 to 0.40 times the width 10X of the interior body 10, and the boundary portion 45 is the width of the interior body 10. 10X is about 0.05 to 0.20 times (only on one side), the edge portion 46 is about 0.05 to 0.10 times (only on one side) the width 10X of the interior body 10, and the intermediate portion 47 is on the interior body 10. The width can be about 0.05 to 0.15 times the width 10X (only on one side).

  The contraction force acting portion (the central region in the width direction left without cutting the dorsal curved elastic member 26 and the cracked portion width direction elastic member 27) of the crack facing portion is a rectangular shape extending in the front-rear direction or toward the front side. The width may increase (for example, an isosceles triangle with the base located on the front side or a curved trumpet with the isosceles on the front side). If it has a shape in which the width increases toward the side, and further on the rear side, the width decreases toward the rear side, a bent fitting portion 40 that fits particularly well against a crack is formed. Therefore, it is preferable.

  Although the size of the contraction force acting portion of the crack facing portion can be determined as appropriate, the width is narrower than the interior body 10, for example, preferably about 0.15 to 0.40 times the width 10X of the interior body 10. The length in the front-rear direction is preferably about 1/5 to 1/2 of the length in the front-rear direction of the interior body 10. Moreover, it is preferable that the front end is located in the front-back direction center or its vicinity. The non-cut portion NC in the above-described cutting pattern has the same shape as the contraction force acting portion and has the same or slightly larger dimensions. In addition, the length and width of the groove 13D or slit provided in the absorber 13 in the front-rear direction may be shorter, longer, or the same as the contraction force acting part, but the width is less than the contraction force acting part. It is preferable to do this.

(Fixing of the interior body 10 and the exterior sheet 20)
As shown in FIGS. 3 and 5, the inner body 10 can be applied to the appropriate regions 81 to 83 on the back surface thereof, and can be fixed to the inner surface of the exterior sheet 20. Thus, from the viewpoint of improving the followability of the interior body 10 to the movement of the legs, the width of the fixing region 81 in the crotch portion is preferably narrowed, for example, about 30 to 45% of the width 10X of the interior body 10, It is preferable that the fixing regions 82 and 83 on both the front and rear sides of the crotch portion are widened to fix the interior body 10 firmly, and in particular, extend to the vicinity of both side edges.

  The fixed regions 81 to 83 having such a shape are coated with a plurality of rows of hot melt adhesives G in the width direction, continuously in the front-rear direction at the intermediate portion, and intermittently at both sides (applied at the crotch portion). Without), each can be formed by coating.

  However, when the width of the fixed region 81 in the crotch portion is narrowed, if the narrow region is excessively extended rearward, there are the following problems. That is, in order to pull up the crotch portion backward by the dorsal curved elastic member 26, a plurality of dorsal curved elastic members 26 and cracked portion width direction elastic members 27 are provided at intervals, and at least one dorsal curved portion is provided. It is preferable that the elastic member 26 is disposed so as to bulge to the front side of the cracked portion width direction elastic member 27 located on the most front side. However, in that case, a region 84 on the outer side in the width direction of the back-side curved elastic member 26 located on the foremost side of the exterior sheet 20 and on the front side of the cracked portion width-direction elastic member 27 located on the most front side is formed in the interior body 10. If it is not fixed, the edge of the leg opening in the region 84 is likely to bend outward. Therefore, in the present embodiment, the region 81 having a narrow adhesive width in the crotch portion is not excessively extended to the rear side, and the fixed region 83 having a wide rear portion is provided on the back side of the exterior sheet 20 so as to be curved. It extends to the region 84 on the outer side in the width direction of the member 26 and on the front side of the cracked portion width direction elastic member 27 located at the foremost side so as to fix the region 84 to the interior body 10 and prevent the dripping. It is configured.

(Balance of tensile stress during longitudinal elastic deformation)
Further, in order to improve the fit of the crack facing portion, the longitudinal contraction force in which the tensile stress in the longitudinal direction in the front body F is larger than the tensile stress in the longitudinal direction in the longitudinal direction in the back body B. A balance is preferred. In the illustrated example, curved elastic members 26, 28,... Are provided as pulling elastic members that exert a contraction force of a longitudinal component so as to lift the crotch portion toward the waist in the front body F and the back body B. Due to the contraction force balance, the tensile stress at the time of elastic deformation in the front body F is larger than the tensile stress at the time of elastic deformation in the back body B. The tensile stress at the time of elastic deformation is the tensile test of the waist opening edge part of the body part to be measured and the crotch side end part of the opposite body part not to be measured, after peeling off both side seal parts 21 and 22 of the diaper and making them unfolded. It can be measured by holding each with a machine chuck and performing a tensile test. The difference in tensile stress at the time of elastic deformation can be determined appropriately, but the tensile stress at the time of elastic deformation in the longitudinal direction when the front body F is 80% elongated (when the elastic limit elongation (strain) is 100%) is It is preferably about 1.1 to 1.2 times that of the body B. As can be seen from this, the magnitude of the tensile stress at the time of elastic deformation is the same at the same elongation (when the elastic limit elongation is 100%, the elongation is preferably in the range of 65 to 95%). Means.

  When the front elastic body 26, 28,... Are provided on the front body F and the back body B as described above, and the tensile stress during the longitudinal elastic deformation in the front body F is larger than that of the back body B, FIG. As shown in FIG. 11, in the mounted state, the crotch portion of the diaper is moved forward by the contraction force of the pulling elastic member 28 of the front body F against the contraction force of the pulling elastic member 26 of the back body B. While lifting, the crotch fits and the front end of the bent fitting portion 40 is pulled forward, and as a result, the bent fitting portion 40 fits the fissure while maintaining its bent state. Therefore, while fitting well from a rupture to a crotch, the fit follows the movement of a body and is maintained elastically, and a crotch part becomes difficult to mokomoko at the time of mounting | wearing. On the other hand, in a conventional general pants-type disposable diaper, as shown in FIG. 12, as a result of the ruptured opposing part bulging and being largely separated from the skin, the crotch part is mokomoko, remarkably different from ordinary underwear Different discomfort occurs.

  In the illustrated example, the pulling elastic member is composed of only the curved elastic members 26. The curved elastic members 26..., 28... Have a function of improving the fit to the buttocks in the front body F and improving the fit to the swelling of the buttocks in the back body B. Of course, instead of or together with the curved elastic members 26, 28, etc., an elastic member such as an elongated shape or a sheet shape may be fixed in a stretched state along the longitudinal direction at the intermediate portion in the width direction to form a lifting elastic member ( (Not shown). When the curved elastic members 26, 28,... Are used in combination with other types of lifting elastic members, the curved elastic members 26, 28,... Are used as either the front body F or the back body B, unlike the illustrated example. Only the other elastic member may be provided on the other side.

  In particular, when the curved elastic members 26, 28, etc. as shown in the illustrated example are provided, the longitudinal interval of the curved elastic members 26 in the rear body B is the front body F at the outer side in the width direction from the side edge of the interior body 10. If the arrangement is wider than the vertical spacing of the curved elastic members 28 in the case, the fitting elastic property of entering the buttocks by the curved elastic members 28 of the front body F is exhibited, and the buttocks by the curved elastic members 26 of the back body B In addition to exhibiting a fitting property that envelops the bulge, when the bent fitting portion 40 fits into a crack while maintaining its bent state, it is difficult to cause a situation of biting into the crack. Therefore, it is preferable.

  The aforementioned front-rear contraction force balance is obtained by measuring at least one of factors of tensile stress during longitudinal elastic deformation in each body F, B, for example, the thickness, elongation rate, number, etc., of the lifted elastic members 26. This can be achieved by making them different. When adjusting the thickness or the like of the pulling elastic members 26, 28, etc., the number of the pulling elastic members 26, 28, etc. is preferably determined according to the size and arrangement of the diapers. The front body F is preferably thicker or higher than the back body B so that at least one of the thickness and the elongation rate is obtained so that the aforementioned front-rear contraction force balance can be obtained.

Specifically, in the illustrated example, it is preferable to define the specifications of each part within the following range. Although the unit of thickness of the elastic member is unified to dtex, it is not limited to synthetic rubber, and natural rubber can be used. The unit dtex when natural rubber is used is the synthesis of the dtex. This means the thickness of natural rubber having an SS curve equivalent to that of rubber (eg, 0.5 mm to 3.0 mm when natural rubber is used for the waist elastic member 24).
・ Exterior sheet 20
Material: Non-woven fabric Basis weight: 30-75 g / m ² , especially 36-60 g / m ²
-Waist elastic member 24 of front body F and back body B
Thickness: 470 to 1,240 dtex, especially 940 to 1,240 dtex
Number: 5-10, especially 8-10 (each body)
Spacing: 0-5mm, especially 3-5mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
-Elastic member 25 around the waist of the front body F
Thickness: 470-1,240 dtex, especially 470-620 dtex
Number: 6-26, especially 8-16 Interval: 10-40 mm, especially 15-35 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
-Elastic member 25 of the waist part of the back body B
Thickness: 470-1,240 dtex, especially 470-620 dtex
Number: 6-24, especially 9-14 Interval: 10-40 mm, especially 15-35 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
-Rupture width direction elastic member 27
Thickness: 470 to 1,240 dtex, especially 940 to 1,240 dtex
Number: 5 to 20, especially 9 to 10 Spacing: 5 to 20 mm, especially 10 to 16 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 330%
-Curved elastic member 28 of front body F
Thickness: 620-1,240 dtex, especially 620-940 dtex
Number: 3-10, especially 5-10 Interval: 10-35 mm, especially 16-32 mm
Elongation rate at the time of fixation: 230 to 380%, particularly 300 to 380%, and higher elongation rate than the curved elastic member 26 of the back body B. The curved elastic member 26 of the back body B
Thickness: 620-1,240 dtex, especially 620-940 dtex
Number: 3-10, especially 5-10 Interval: 10-35 mm, especially 16-32 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%

(Configuration for exterior sheet flexibility)
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 preferable that it is wide. Further, even outside the overlapping range 30, the waist elastic member 25... Is 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. It is preferable to provide a plurality (for example, about 10 to 16).

  In this way, while allowing a certain overlap range 30 between the longitudinal range having the waist elastic members 25 ... and the longitudinal range having the curved elastic members 26, 28 ..., the waist elastic members 25 ... are within that 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, the crack width elastic member 27, and the curved elastic members 26, 28 are between the pair of sheet layers 20A, 20B constituting the exterior sheet 20. In addition, the adhesive is fixed to the sheet layers 20A and 20B by a hot melt adhesive, and the amount of the adhesive applied greatly affects the flexibility of the exterior sheet 20. Therefore, as shown in FIG. 7, the application portions G1 to G3 of the adhesive include the arrangement portion of the waist elastic member 24 and the vicinity thereof, the arrangement portion of the waist elastic member 25. The arrangement part of the elastic members 27 and the vicinity thereof, the arrangement part of the curved elastic members 26, 28, and the vertical and horizontal distances thereof within a predetermined distance a (normally within ± 25 mm, more preferably within ± 10 mm, particularly preferably ± 5 mm). It is preferable that the adhesive is not applied between the two sheet layers other than these adhesives. In this way, by reducing the adhesive application portions G1 to G3 as much as possible, hardening by the adhesive can be suppressed in each stage. In addition, when this is combined with an increase in the local spacing between the waist elastic members 25...

  FIG. 7 shows application sites G1 to G3 of the hot-melt adhesive in the manufacturing process, and the curved elastic members 26, 28,... Are in a state before cutting a portion crossing the interior body 10 as indicated by a two-dot chain line. Is shown. An adhesive G1 for fixing the waist elastic member 24 and the waist elastic member 25 ... to both sheet layers 20A, 20B, and an adhesive for fixing the cracked portion width direction elastic member 27 ... to both sheet layers 20A, 20B. G2 is applied substantially only at the location where the elastic members 24 and 25 are disposed and in the vicinity thereof. 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 G3 for fixing the curved elastic members 26, 28,... To the two sheet layers 20A, 20B has a rectangular adhesive-applied portion B2 that is stepped along the curved direction of the curved elastic members 26, 28,. Are arranged in parallel to each other, so that the adhesive is applied only to the region where the curved elastic members 26, 28,..., 28. Has been. 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.

(Structural example of interior body)
As shown in FIGS. 4 to 6, the interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 made of a nonwoven fabric or the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like. The excretory fluid that has permeated through the top sheet 11 is absorbed and retained.

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

  As the liquid-impermeable back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.

  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.

  In addition, the above-mentioned bending fitting part 40 can also assist the formation by providing a groove 13D or a slit along the longitudinal direction in the crack-opposing part of the absorbent body 13, and in that case, bending at an appropriate position as a fold. The fitting part 40 is formed and the shape thereof is easily maintained.

  It is preferable that solid gather BSs that fit around the legs are formed on both sides of the interior body 10. This three-dimensional gathered BS is formed by the gathered nonwoven fabric 15. As the gathered nonwoven fabric, as shown in FIGS. 5 and 6, 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 BS forming portion left in the middle portion in the longitudinal direction of the diaper 1, and a range 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. Further, at the longitudinal front and rear end portions, the section from the width direction intermediate portion to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and a portion forming the three-dimensional gather BS is attached to the absorber 13 It is bonded with a hot melt adhesive or the like while being folded at the upper surface.

  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 BS 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. 5 in the product state. It is.

  The liquid-impermeable back side sheet 12 enters the inside of the double sheet-like gathered nonwoven fabric 15 and constitutes a leak-proof wall on the lower end side of the three-dimensional gathered BS 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. Moreover, in order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the elongation 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.

(Front / rear presser sheet)
As shown in FIGS. 1 and 4, in order to cover the front and rear end portions of the interior body 10 attached on the inner surface of the exterior sheet 20 and to prevent leakage from the front and rear edges of the interior body 10, 50, 60 are provided. The illustrated embodiment will be described in more detail. The front presser sheet 50 extends over the entire width direction from the inner surface of the folded portion 20C of the waist side end portion to the position overlapping the front end portion of the interior body 10 in the inner surface of the front body F. The rear presser sheet 60 extends across the entire width direction from the inner surface of the folded portion 20C at the end on the waist side to the position overlapping the rear end of the interior body 10 in the inner surface of the back body B. If a slight non-adhesive portion is provided in the crotch side edges of the front and rear presser sheets 50, 60 over the entire width direction (or only the central portion), not only the adhesive does not stick out, but 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. Here, the “degree of twist” can be measured using, for example, KES-YN1 (manufactured by Kato Tech Co., Ltd.), and the smaller the value, the more flexible the twist. Moreover, when an exterior sheet | seat consists of one nonwoven fabric, it itself means the nonwoven fabric located in the outermost side. 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.

  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 ... Interior body, 11 ... Liquid-permeable surface sheet, 12 ... Liquid-impermeable back side sheet, 13 ... Absorber, 14 ... Packaging sheet, 15 ... Gathered nonwoven fabric, 16 ... Yarn-like elastic stretch Member: 20 ... exterior sheet, 21, 22 ... side seal part, 24 ... waist elastic member, 25 ... waist elastic member, 26 ... dorsal curved elastic member, 27 ... crack part width direction elastic member, 28 ... belly Side-curved elastic member, 29 ... Leg opening edge, 20C ... Exterior sheet folded part, 81 to 83 ... Fixed region, 41 ... Side part overlapping part, 42 ... Side extension part, 43 ... Non-shrinking part, 44 ... Main part 45 ... Boundary portion, 46 ... Edge side portion, 47 ... Edge side portion, F ... Front body, B ... Back body.

Claims (3)

An exterior sheet that forms a front body and a back body, and an interior body including an absorbent body that is fixed to an inner surface of the exterior sheet, and both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body Are joined to form a side seal portion, thereby forming a waist opening and a pair of left and right leg openings,
Side portions extending in the width direction of the crack facing portion of the outer body sheet of the back body overlap side portions overlapping the side portions of the interior body, and lateral extensions extending laterally from the side edges of the interior body. In a pants-type disposable diaper having a part,
From the right side seal part of the back body to the right side overlap part along the edge of the right leg opening part of the back body, so that it goes from the right side part overlap part to the front side while moving further toward the center in the width direction To the crack facing part located at the center in the width direction of the back body, folded back to the crack facing part, and further curved toward the rear side toward the left side and the left side part Leading to the overlapping part, from the left side overlapping part to the left side seal part of the back body along the edge of the left leg opening of the back body; an elongated dorsal curved elastic member in its longitudinal direction While being fixed to the exterior sheet in a state of being stretched at a predetermined stretch rate,
An elongated shape extending from the side edge of one of the laterally extending portions to the side edge of the other laterally extending portion across the crack facing portion and the side overlapping portion on both sides thereof in the width direction. The cracked portion width direction elastic member is fixed to the exterior sheet in a state of being stretched at a predetermined elongation rate in the extending direction,
The back-side curved elastic member and the cracked portion width direction elastic member are only non-contracted portions that are finely cut and do not act on contraction force, only the portion located on the center side in the width direction of the side overlap portion. ,
The cracked portion width direction elastic member includes a main portion located in the crack facing portion, and a boundary portion extending in the vicinity of both sides in the width direction of the boundary between the side overlapping portion and the side extending portion. The edge side portion located on the outer side in the width direction of the portion, and the intermediate portion located between the boundary portion and the non-shrinkable portion are fixed to the exterior sheet at a low elongation rate.
A pants-type disposable diaper characterized by that. The exterior sheet is formed by bonding an outer layer and an inner layer,
The back-side curved elastic member and the cracked portion width direction elastic member are sandwiched between the outer layer and the inner layer and fixed to the outer layer and the inner layer by a hot melt adhesive,
The amount of hot melt adhesive applied between the outer layer and the inner layer is less in the edge portion and the intermediate portion than in the main portion and the boundary portion,
The pants-type disposable diaper according to claim 1. A plurality of the back-side curved elastic members and the cracked portion width direction elastic members are provided at intervals, and at least one back-side curved elastic member swells to the front side of the cracked portion width direction elastic member located at the foremost side. It is arranged to put out,
A region on the outer side in the width direction of the dorsal curved elastic member located on the foremost side in the exterior sheet and on the front side of the cracked portion width direction elastic member located on the foremost side is fixed to the interior body. Item 1 or 2 pants-type disposable diaper.

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