JP2012200295A - Pants type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pants type disposable diaper excellent in dynamic fitting on a ventral side.SOLUTION: When elastic deformation time tensile force in a width direction of a front waist edge part area fw is defined as F, elastic deformation time tensile force in the width direction of an ilium abutting area fi is defined as F, and elastic deformation time tensile force in the width direction of an abdominal part abutting area fd is defined as F, the relation of F>F>Fis satisfied.

Description

  The present invention relates to a pants-type disposable diaper.

  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. A side seal portion is formed by bonding, and a waist opening and a pair of left and right leg openings are formed. Hereinafter, the fixing portion between the exterior sheet and the interior body is also referred to as an inner / outer fixing portion.

  In the pants-type disposable diaper, in order to improve the fit to the body, various elastic elastic members are fixed to the exterior sheet in an extended state, and in particular, the longitudinal region having a side seal portion In general, those having an elastic expansion and contraction member (Patent Document 1, etc.) are generally used.

  In addition, while the tightening pressure in the waist edge region is generally relatively high, by increasing the tightening pressure in the diaper region corresponding to the wearer's iliac region, It has also been proposed to make a good fit with respect to the stomach that has been put out to prevent slippage (see Patent Document 1).

JP 2010-279813 A

  However, the pants-type diaper of the type of Patent Document 1 is superior to the conventional in terms of static fit, but prevents slippage caused by belly expansion / contraction or deformation caused by the movement of the body before and after a meal. However, there was room for improvement in terms of dynamic fit. And when there exists such a shift | offset | difference fall, there exists a possibility that the appearance at the time of diaper mounting | wearing may deteriorate, or a leak may generate | occur | produce by the clearance gap formation between a diaper and skin.

  Then, the main subject of this invention is providing the underpants type diaper which is excellent in the dynamic fit property in the ventral side.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The side seal part is formed by joining the both sides of the exterior sheet forming the front body extending from the crotch part to the ventral side and the both sides of the exterior sheet forming the back body extending from the crotch part to the back side. A pants-type disposable diaper in which a waist opening for passing a wearer's torso and a pair of left and right leg openings for passing a leg are formed, and an interior body including an absorbent body is provided inside the exterior sheet In
Of the exterior sheet forming the front body and the exterior sheet forming the back body, at least the longitudinal regions having the side seal portions are configured to elastically expand and contract in the width direction, respectively.
The longitudinal region having the side seal portion of the exterior sheet forming the front body is located on the crotch side from the front waist edge region that forms the edge of the waist opening, and the front waist edge region. An iliac abutment region that abuts against the iliac region of the body, and a lower abdomen abutment region that abuts the lower abdomen of the wearer,
F _{fw is} the tensile force during elastic deformation in the width direction of the front waist edge region, F _{fi is} the tensile force during elastic deformation in the width direction of the iliac contact region, and elastic deformation in the width direction of the lower abdomen contact region. When the tensile force is F _fd , it is configured to satisfy the relationship of F _fd > F _fw > F _fi .
A pants-type disposable diaper characterized by that.

(Function and effect)
The feature of the present invention is that the tensile force F _fd during elastic deformation in the width direction of the lower abdomen contact region is the strongest, and then the F _fw is increased as the tensile force during elastic deformation in the width direction of the front waist edge region. This is because the tensile force at the time of elastic deformation in the width direction of the bone contact region is the weakest F _fi (in this respect, in contrast to the cited reference 1). The lower abdomen is the region in which the lower abdomen contact region is the most difficult to shift because the stomach is significantly less expanded and contracted and deformed due to the movement of the body before and after meals and the body than the iliac region on the upper side. Therefore, the diaper can be firmly supported on the body by making the tightening force of the lower abdomen contact region the strongest. Further, by making the tightening force of the iliac abutment region the weakest, it is possible to flexibly follow the expansion and contraction and deformation of the stomach. Furthermore, if the tightening force of the iliac abutment region is simply weakened, the slippage is likely to drop, but in the present invention, the tightening force of the front waist edge region is stronger than that of the iliac abutment region, and the tightening force of the lower abdomen abutment region Therefore, the regions on both sides in the longitudinal direction of the iliac abutment region are supported, and the iliac abutment region can be prevented from being displaced. Therefore, according to the present invention, both static fit and dynamic fit are improved, and the effect of preventing slippage is excellent.
The iliac region refers to the region from the iliac crest to the upper anterior iliac spine, and the lower abdomen is the combined portion of the pubic region and the buttocks. It means the place that touches the thigh. Further, the tensile force at the time of elastic deformation means a tensile force at an elongation of 150% when the natural length in the width direction is 100%.

<Invention of Claim 2>
The longitudinal region having the side seal portion of the exterior sheet forming the back body is a rear waist edge region corresponding to the front waist edge region, a rear intermediate region corresponding to the iliac contact region, A rear lower end side region corresponding to the lower abdomen contact region,
F _{bw is} the tensile force during elastic deformation in the width direction of the rear waist edge region, F _{bi is} the tensile force during elastic deformation in the width direction of the rear intermediate region, and tensile force during elastic deformation in the width direction of the rear lower end region. the when the _{F bd, F fd = F bi} = F bd> F fw = F bw> was configured to satisfy the relation of F _fi, pants-type disposable diaper according to claim 1, wherein.

(Function and effect)
The back body is the part facing the buttocks, which is a part with a large bulge, but because the buttocks are a part with little expansion and contraction and deformation, unlike the front body, tightening the entire body strongly can prevent slippage. Become better.

<Invention of Claim 3>
The exterior sheet that forms the front body includes at least a front waist edge region, an iliac abutment region, and a lower abdomen abutment region that are integrally stretchable nonwoven fabric, and a front waist edge region in the stretch nonwoven fabric that is vertically spaced. Elongated front waist edge elastic elastic members along a number of width directions fixed at intervals, and elongates along a number of width directions fixed at intervals in the lower abdomen abutment region in the elastic nonwoven fabric And has an elastic elastic member in the iliac abutment region in the elastic nonwoven fabric,
By differentiating at least one of the longitudinal arrangement interval, the thickness, the elongation rate at the time of fixation, and the number between the front waist edge elastic elastic member and the lower abdominal elastic elastic member, the F _fd > F _fw The underpants-type disposable diaper according to claim 1 or 2, configured to satisfy a relationship of> F _fi .

(Function and effect)
In the case where a weak contraction force is uniformly exerted over the entire longitudinal direction of the iliac contact region in the front body, it is difficult to manufacture with a technique in which an elastic elastic member such as thread rubber is fixed to the sheet base material in an expanded state. On the other hand, at present, it is unrealistic to obtain a contraction force that is sufficient to prevent slipping off with only a stretchable nonwoven fabric. In addition, it is conceivable to use different members for each region of the front body, but there are problems such as increased manufacturing costs. On the other hand, as described above, the front waist edge region, the iliac abutment region, and the lower abdomen abutment region are based on an integral stretch nonwoven fabric, and the front waist edge region and the abdomen abutment region It is preferable to provide an elongated elastic expansion / contraction member as appropriate so as to satisfy the relationship of F _fd > F _fw > F _{fi because} an appropriate tightening force can be easily applied to each region and manufacturing is extremely easy. . In particular, when a stretchable nonwoven fabric is used in the iliac abutment region, it fits evenly and flexibly to the abdominal bulge and the upper anterior iliac spine, so that the feeling of pressure is small, and the elastic stretch member is used. The bite to the skin can be eliminated.
The stretchable nonwoven fabric means that the nonwoven fabric itself elastically expands and contracts at least in the width direction without adding an elastic stretch member such as thread rubber.

<Invention of Claim 4>
The exterior sheet forming the back body has a longitudinally spaced space between an integral sheet base material extending at least a rear waist edge region, a rear intermediate region and a rear lower end side region, and a rear waist edge region of the sheet base material. A plurality of elongated rear waist edge elastic elastic members along the width direction fixed in the width direction extended state, and fixed in the width direction extended state with a space in the rear intermediate region of the sheet base material in the vertical direction. A plurality of elongated first post-elastic elastic members along the width direction, and a plurality of elongated along the width direction fixed in the width direction extending in the longitudinal direction at the rear lower end side region of the sheet base material The underpants type disposable diaper of Claim 3 which has a 2nd elastic elastic member after a shape.

(Function and effect)
Since the back body cannot be sufficiently tightened with a material having a weak contraction force such as a stretchable nonwoven fabric, unlike the front body, it is preferable to dispose a plurality of slender elastic stretch members with a large number of intervals.

<Invention of Claim 5>
The exterior sheet that forms the front body is an integral sheet base material extending at least over the front waist edge region, the iliac contact region, and the lower abdomen contact region, and the front waist edge region of the sheet base material in the longitudinal direction. A number of elongated front waist edge elastic elastic members along the width direction, which are fixed in an extended state in the width direction at intervals, and a width direction in the longitudinal direction at the iliac contact region in the sheet base material Numerous elongated iliac elastic members extending in the width direction fixed in the stretched state, and many fixed in the widthwise stretched state in the lower abdomen abutment region of the sheet base material in the longitudinal direction. An elongated lower abdomen elastic elastic member along the width direction of
By differentiating at least one of the longitudinal arrangement interval, the thickness, the elongation rate at the time of fixation, and the number among the three members of the front waist edge elastic elastic member, the iliac elastic elastic member and the lower abdominal elastic elastic member the F _fd> F _fw> was configured to satisfy the relation of F _fi, claim 1 or 2 pants-type disposable diaper according.

(Function and effect)
As described above, using a stretchable nonwoven fabric in the front body is one preferred form, but the material cost increases as much as the stretchable nonwoven fabric. On the other hand, with the configuration described in this section, an appropriate tightening force can be easily applied to each region without using a stretchable nonwoven fabric.

  As described above, according to the present invention, there are advantages such as excellent dynamic fit on the ventral side.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is a perspective view which shows roughly only the principal part of a pants type disposable diaper. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a perspective view of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. It is a longitudinal cross-sectional view of a pants type disposable diaper. It is a perspective view of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 8 show an example 100 of a pants-type disposable diaper. The pants-type disposable diaper 100 includes an exterior sheet 12 that forms the outer surface (rear surface) of the product and an interior body 200 that is attached to the inner surface of the exterior sheet 12. Symbol Y indicates the total length of the diaper in the deployed state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and symbol X indicates the diaper in the deployed state. The full width of is shown.

  The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior sheet 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive. Also, “front-rear direction (vertical direction)” means a direction connecting the ventral side (front side) and back side (rear side), and “width direction” means a direction (left-right direction) orthogonal to the front-rear direction. The “vertical direction” means the state in which the diaper 100 is worn, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch so that both sides of the front body and the back of the diaper 100 overlap each other. In other words, it means the direction connecting the waist opening WO side and the crotch side.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a surface sheet 30 on the body side, a liquid-impermeable back sheet 11, and an absorbent element 50 interposed therebetween. It is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows barrier cuffs 60 that stand on the body side and are provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

  Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

  When the barrier cuff 60 is provided, both sides of the top sheet 30 pass between the liquid-impervious back sheet 11 and the barrier cuff 60 to the back side of the absorbent element 50 to prevent the penetration of the liquid. It is preferable to adhere to the liquid-impermeable back sheet 11 and the barrier cuff 60 with a hot melt adhesive or the like.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

(Impermeable liquid back sheet)
The material of the liquid-impermeable back sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of the nonwoven fabric, or plastic Examples thereof include a laminated sheet in which a nonwoven fabric or the like is laminated on a film and joined. For the liquid-impermeable back sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using micro-denier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as applying a superabsorbent resin or hydrophobic resin or water repellent Accordingly, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable back sheet 11.

  The liquid-impermeable back sheet 11 is preferably extended to both sides of the side surface 30 of the absorbent element 50 by wrapping around both sides of the absorbent element 50 in order to improve leakage resistance. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

  Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the liquid-impermeable back sheet 11, especially the absorber 56 side surface.

(Barrier cuffs)
The barrier cuff 60 is a belt-like member that extends over the entire front and rear direction along both side portions of the interior body 200, blocks urine and soft stool that move laterally along the top sheet 30, and prevents side leakage. It is provided for this purpose. The barrier cuff 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion stands up obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the barrier cuff 60 is formed by folding a belt-like barrier sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 and folding it in the width direction. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end of the barrier cuff 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the topsheet 30 through the side portion of the interior body 200 and are hot-melted to the side surface of the topsheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic member 63 extending in the front-rear direction is fixed to the free part in an extended state.

The barrier sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water-repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%. Further, as shown in the figure, a waterproof film 64 can be interposed between the barrier sheets folded in two.

  The number of the elongated elastic stretch members 63 provided in the free part of the barrier cuff 60 is preferably 2-6, and more preferably 3-5. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  The fixing target of the attachment portion 65 of the barrier cuff 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable back sheet 11, the absorbent element 50 in the interior body 200.

  In the barrier cuff 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts to bring the both ends in the front-rear direction close to each other, but the both ends of the projecting portion 66 are fixed so that they do not stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown in FIG. In particular, when the attachment portion 65 is located on the back surface side of the interior body 200, the barrier cuff 60 stands up so that the barrier cuff 60 opens outward in the width direction at and around the crotch portion. It comes in contact, and the fit is improved.

  The dimensions of the barrier cuff 60 can be appropriately determined. In the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the barrier cuff 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. In addition, when the barrier cuff 60 is flatly folded so that the barrier cuff 60 is parallel to the surface of the top sheet 30, the distance W3 between the innermost folds is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

  Unlike the illustrated embodiment, double (two rows) of barrier cuffs can be provided on the left and right sides of the interior body 200.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  Although the absorbent body 56 may be rectangular, as shown in FIG. 6, as shown in FIG. 6, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. The shape is preferable because the fit of the absorbent body 56 and the barrier cuff 60 around the legs is improved.

  Moreover, although the dimension of an absorber can be determined suitably, it is preferable to extend to the peripheral part of the interior body, or its vicinity in the front-back direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

  If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

(Exterior sheet)
The exterior sheet 12 has a part constituting the front body F extending from the crotch part to the ventral side and a part constituting the rear body B extending from the crotch part to the back side, and both sides of the front body F As shown in FIG. 8, the waist opening WO for passing the wearer's torso and the left and right sides for passing the legs are joined. A pair of leg openings LO is formed. The crotch portion means the center in the front-rear direction from the waist edge of the front body F to the waist edge of the back body B in the unfolded state, and the front part and the back part thereof are the front body F and Each back body B is meant.

  The exterior sheet 12 includes a waistline portion T that is defined as a vertical region (a vertical region extending from the waist opening WO to the upper end of the leg opening LO) and a front-rear direction region of a portion that forms the leg opening LO. An intermediate portion L defined as (between the front-rear direction region having the side seal portion 12A of the front body F and the front-rear direction region having the side seal portion 12A of the rear body B).

  The waistline T is located on the front waist edge region fw and the rear waist edge bw (region corresponding to the front waist edge region) that form the edge of the waist opening, and between these crotch sides, The iliac abutment region fi and the posterior intermediate region bi (part corresponding to the iliac abutment region), the lower abdomen abutment region fd that abuts the lower abdomen of the wearer, and the rear lower end side region bd (Part corresponding to the lower abdomen contact area), and each elastically expands and contracts in the width direction.

  The vertical lengths of these regions vary depending on the size of the product and can be determined as appropriate. For example, the vertical lengths of the front waist edge region fw and the rear waist edge bw are 2 to 12 of the total length Y of the diaper. %, The longitudinal length of the iliac abutment region fi and the posterior intermediate region bi is about 2 to 14% of the diaper overall length Y, and the longitudinal length of the lower abdomen abutment region fd and the posterior lower end side region bd is the diaper overall length. It can be about 5 to 19% of Y. In particular, when the longitudinal length of the side seal portion 12A is 20 to 30% of the total length of the diaper, for example, the longitudinal lengths of the front waist edge region fw and the rear waist edge portion bw are about 2 to 10% of the total length Y of the diaper. The longitudinal length of the iliac abutment region fi and the posterior intermediate region bi is about 4 to 12% of the diaper overall length Y, and the longitudinal length of the lower abdomen abutment region fd and the posterior lower end side region bd is the diaper overall length Y. It can be about 8 to 15%.

  On the other hand, the intermediate portion L is bound so that both side edges extend around the legs of the wearer, and this is a portion into which the wearer's legs are put. As a result, the exterior sheet 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior sheet 12 can be determined as appropriate, and, as shown in FIGS. 1 to 8, the narrowest part may be narrower than the width of the interior body 200 in order to obtain a clean appearance. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

Characteristically, in the exterior sheet 12, the tensile force at the elastic deformation in the width direction of the front waist edge region fw is F _fw , the tensile force at the elastic deformation in the width direction of the iliac contact region fi is F _fi , When the tensile force at the time of elastic deformation in the width direction of the abdomen contact region fd is F _fd , it is configured to satisfy the relationship of F _fd > F _fw > F _fi . Thus, the tightening force of the lower abdomen abutting region, which is the least difficult to shift, is greatly reduced, and the iliac abutment region fi of the body surface is greatly increased in size. When the tightening force is made the weakest and the tightening force of the front waist edge region fw is next to the lower abdomen contact region fd, the diaper can be firmly supported against the body in the lower abdomen contact region fd. In the iliac contact region fi, it is possible to flexibly follow the expansion and contraction and deformation of the stomach. In addition, if the weakness of the tightening force of the iliac abutment region fi is weakened, the slippage is easily lost, but the tightening force of the front waist edge region fw is stronger than that of the iliac abutment region fi, and the lower abdomen abutment region Since the tightening force of fd is the strongest, the regions on both sides in the longitudinal direction of these iliac abutment regions fi serve as support, and the iliac abutment region fi can be prevented from being displaced. Therefore, both static fit and dynamic fit are improved, and the effect of preventing slippage is excellent.

In the exterior sheet 12, the tightening force of the rear waist edge region bw, the rear intermediate region bi, and the rear lower end side region bd can be determined as appropriate, but the tensile force during elastic deformation in the width direction of the rear waist edge region bw is determined. F _bw, when the width direction of the elastic deformation tensile force F _bi rear intermediate region bi, the width direction of the elastic deformation when tensile force of the rear lower end area bd was _{F bd, F fd = F bi} = F bd> F It is preferable to be configured to satisfy the relationship of _fw = F _bw > F _fi . The back body B is the part that faces the heel part, which is a part with a large bulge, but since the heel part is a part with little expansion and contraction and deformation, unlike the front body F, if it is tightened as a whole, it will prevent slippage. Becomes more effective.

Here, as described above, the tensile force at the time of elastic deformation means the tensile force (gf) at an elongation of 150% when the natural length in the width direction is 100%, and the corresponding region is cut out from the diaper. It can be measured by grasping both ends in the width direction with a tensile tester and conducting a tensile test at a tensile speed of 300 mm / min. The tensile force during elastic deformation of each region can be determined as appropriate. However, as a result of experiments by the present inventors, the tensile force F _fw during elastic deformation in the width direction of the front waist edge region _fw is about 50 to 250 gf. bone contact area width direction of the elastic deformation tensile force F _fi of fi about 25～150Gf, abdominal contacting region elastic deformation when tensile force F _fd in the width direction of fd is preferably in the range of about 75～300Gf, force F _bw pulling when the width direction of the elastic deformation of the rear waist edge region bw about 50～250Gf, the width direction of the elastic deformation tensile force F _bi rear intermediate region bi about 75～300Gf, the lower rear end side region bd The tensile force F _bd during elastic deformation in the width direction is preferably about 75 to 300 gf.

  The magnitude relationship of the tensile force at the time of elastic deformation in the front waist edge region fw, the iliac contact region fi, and the lower abdomen contact region fd of the exterior sheet 12 is well known, such as being formed by jointing using different members in each region. It can form by the method of. Therefore, for example, as shown in FIGS. 10 to 12, the two sheet base materials 12 </ b> S and 12 </ b> H are bonded together with an adhesive such as a hot melt adhesive to form the exterior sheet 12, A general-purpose structure in which elongated elastic elastic members 14 to 20 such as rubber thread are provided between the sheet base materials 12S and 12H in each region fw, fi, fd, bw, bi, and bd can also be adopted.

  The form shown in FIGS. 10 to 12 will be further described. In the exterior sheet 12, the inner sheet base 12H located on the inner side extends only to the edge of the waist opening WO, but the outer sheet base 12S is on the inner side. The edge of the sheet base 12 </ b> H is wrapped around the edge on the waist side, and the folded portion 12 r extends so as to cover up to the end on the waist side of the interior body 200.

The sheet base materials 12S and 12H can be used without particular limitation as long as they are in sheet form, but are preferably non-woven fabrics. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When using a nonwoven fabric, it is preferable that the basic weight shall be about 10-30 g / m < ² >.

  In the exterior sheet 12, elongated elastic elastic members 14 to 20 such as thread rubber are provided at a predetermined elongation rate between the sheet base materials 12 </ b> S and 12 </ b> H in order to improve fit to the waistline. As the elongated elastic elastic members 14 to 20, synthetic rubber or natural rubber may be used. For bonding the two sheet base materials 12S and 12H of the exterior sheet 12 and fixing the elongated elastic elastic members 14 to 20 sandwiched therebetween, hot melt bonding or heat sealing or ultrasonic bonding by various coating methods is used. Can do.

More specifically, between the inner side surface of the inner sheet substrate 12H and the outer surface of the folded portion 12r of the outer sheet substrate 12S in the front waist edge region fw and the rear waist edge region fw, the entire width direction is extended. In a state where a plurality of front waist edge elastic elastic members 17 and a plurality of rear waist edge elastic elastic members 17 are stretched along the width direction at a predetermined elongation rate with a plurality of intervals in the vertical direction so as to be continuous. It is fixed. Of the front waist edge elastic elastic member and the rear waist edge elastic elastic member 17, one or a plurality of elastic members arranged on the crotch side may overlap with the interior body 200, or the interior body 200. They may be provided on both sides in the width direction except for the central portion in the width direction that overlaps with each other. The front waist edge elastic elastic member 17 and the rear waist edge elastic elastic member 17 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1). .5 mm ² , especially about 0.1 to 1.0 mm ² ), and 3 to 22 thread rubbers with an interval of 4 to 12 mm, and an elongation rate of 150 to 400%, particularly about 220 to 320%, respectively. Can do. Further, the front waist edge elastic elastic member and the rear waist edge elastic elastic member 17 need not all have the same thickness and elongation rate. For example, the thickness of the elastic elastic member at the upper and lower portions of the waist edge W The expansion rate may be different.

Moreover, between the outer surface of the inner sheet base material 12H and the inner surface of the outer sheet base material 12S in the iliac contact region fi and the posterior intermediate region bi, except for the central portion in the width direction that overlaps the interior body 200, A plurality of iliac elastic elastic members 19 and posterior first elastic elastic members 15 made of an elongated elastic elastic member are respectively provided in the vertical direction so as to be continuous over the entire width direction of each part on both sides in the width direction. And fixed in a state of being stretched along the width direction at a predetermined stretch rate. The iliac elastic member 19 and the posterior first elastic member 15 have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1. 5 mm ² (especially about 0.1 to 1.0 mm ² ) of thread rubber, about 1 to 15 mm, especially about 5 to 30 at intervals of 3 to 8 mm, elongation rate of 200 to 350%, especially about 240 to 300%, respectively. It can be fixed with.

Moreover, the width direction center part which overlaps with the interior body 200 is excluded between the outer surface of the inner sheet base 12H and the inner surface of the outer sheet base 12S in the lower abdomen contact region fd and the rear lower end side region bd. A plurality of lower abdominal elastic elastic members 20 and rear second elastic elastic members 14 made of an elongated elastic elastic member are spaced apart in the vertical direction so as to be continuous over the entire width direction of each part on both sides in the width direction. And fixed in a state of being stretched along the width direction at a predetermined stretch rate. The lower abdominal elastic elastic member 20 and the rear second elastic elastic member 14 have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm). ² , especially about 0.1 to 1.0 mm ² ), about 1 to 15 mm, especially about 3 to 30 at an interval of 3 to 8 mm, respectively, with an elongation of about 200 to 350%, especially about 240 to 300%. Can be fixed.

Further, in the illustrated form, a central portion in the width direction that overlaps the interior body 200 between the outer surface of the inner sheet base 12H and the inner surface of the outer sheet base 12S in the intermediate portion L of the front body F and the rear body B. Except for a plurality of intermediate elastic elastic members 16, 18 made of an elongated elastic elastic member so as to be continuous over the entire width direction at each part on both sides in the width direction, with a space in the vertical direction, and It is fixed in a state of being stretched along the width direction at a predetermined stretch rate. The intermediate elastic elastic members 16 and 18 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to Thread rubber of about 1.0 mm ² ) can be fixed at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.

  As shown in the figure, the iliac elastic elastic member 19 and the rear first elastic elastic member 15, the lower abdominal elastic elastic member 20, the rear second elastic elastic member 14, and the intermediate elastic elastic members 16 and 18 are provided in the interior. If it is provided on both sides in the width direction except for the central part in the width direction, which overlaps with the body 200, the interior body 200 will not shrink more than necessary in the width direction, and it will look bad and absorbability will decline. There is nothing to do. In this form, in addition to the form in which the elastic elastic members 14 to 16 and 18 to 20 exist only on both sides in the width direction, the elastic elastic members 14 to 16 and 18 cross the interior body 200 from one side in the width direction to the other side. However, the elastic elastic members 14 to 16 and 18 to 20 are finely cut at the central portion in the width direction overlapping the interior body 200, and the contraction force does not act (substantially, the elastic elastic member is It is equivalent to not providing) that includes a configuration in which only both sides in the width direction are configured as contraction force acting portions. Of course, the arrangement form of the elastic stretch members 14 to 16 and 18 to 20 is not limited to the above example, and the elastic stretch members 14 to 16 so that the stretch force acts over the entire width of the front body F and the back body B. , 18 to 20 can be provided from one side to the other side in the width direction across the interior body 200.

  And these front waist edge elastic elastic members and rear waist edge elastic elastic members 17, iliac elastic elastic members 19 and rear first elastic elastic members 15, lower abdominal elastic elastic members 20 and rear second elastic elastic members 14, at least one of a longitudinal arrangement interval, a thickness, an elongation rate at the time of fixation, and the number is determined so as to satisfy the magnitude relationship of the tensile force at the time of elastic deformation. For example, the lower abdominal elastic elastic member 20, the front waist edge elastic elastic member 17, and the iliac elastic elastic member 19 are sequentially fixed so as to satisfy the above-described magnitude relationship of the tensile force during elastic deformation in the front body F. The elongation rate can be increased by about 5 to 15%, or the thickness can be increased by about 5 to 15%.

  Note that if the tensile force during elastic deformation in the width direction of the iliac abutment region fi is relatively weakened, the fit of the iliac abutment region fi may be lowered. As shown in FIG. It is also a preferred embodiment that the partial elastic member 19 is provided along the oblique direction, particularly along the groin, so as to be positioned on the front waist edge region fw side from the width direction center side toward the width direction outer side. .

However, in the form shown in FIGS. 10 to 12, it is difficult to exert a weak contraction force uniformly over the entire longitudinal direction of the iliac contact region fi in the front body F. Therefore, in the form shown in FIGS. 1 to 6, the front waist edge region fw, the iliac contact region fi, and the lower abdomen contact region fd in the front body F of the exterior sheet 12 described above are integrally stretched nonwoven fabric. It is formed with 12G, and it is joined to the rear side part, and the front waist edge region fw and the lower abdomen contact region fd in the stretchable nonwoven fabric 12G, except for the central portion in the width direction that overlaps the interior body 200, A plurality of front waist edge elastic elastic members 17 and lower abdominal elastic elastic members 20 made of an elongated elastic elastic member are spaced apart in the vertical direction so as to be continuous over the entire width direction of each part on both sides in the width direction. And a structure in which an elastic elastic member is not provided in the iliac abutment region fi of the elastic nonwoven fabric 12G. Between two parties phytoene resilient and elastic members 17 and the lower abdomen resilient and elastic members 20, the vertical arrangement interval, thickness, by made different at least one elongation and the number of fixed upon, F _fd> F _fw It is preferable to configure so as to satisfy the relationship of> F _fi . In this embodiment, based on the tightening force of the stretchable nonwoven fabric, different tightening forces by the elongated elastic stretch members 17 and 20 are applied to the front waist edge region fw and the lower abdomen contact region fd, respectively. The magnitude relationship of power comes to be formed. Therefore, it is preferable because an appropriate tightening force can be easily applied to each of the regions fw, fi, and fd and the manufacturing becomes extremely easy. In particular, when the stretchable nonwoven fabric 12G is used for the iliac abutment region fi, it fits evenly and flexibly to the bulge of the abdomen and the upper anterior iliac spine, so that the feeling of pressure is small, and an elastic stretch member is used The biting into the skin can be eliminated.

  The stretchable nonwoven fabric 12G means that the nonwoven fabric itself elastically expands and contracts at least in the width direction without the addition of an elastic stretch member such as thread rubber. For example, as described in Japanese Patent Application Laid-Open No. 2008-156785, a pair of nonwoven fabrics is used. The first web and the second web are manufactured by using a so-called “gear stretching” processing method that stretches in the process of passing between the gears, or according to claim 4 of JP-A-2001-200460. And the like are manufactured by intermittently joining and performing extension processing and contraction processing.

  In the form shown in FIG. 5, the crotch side end of the stretchable nonwoven fabric 12G is folded and the lower abdomen elastic elastic member 20 is sandwiched and fixed between the folded portions, but the lower abdomen abutment region fd is separated into two pieces. May be formed by pasting together the stretchable nonwoven fabrics, and the lower abdomen elastic stretchable member 20 may be sandwiched and fixed therebetween.

  In the form shown in FIG. 2, the interior body 200 extends to the lower abdomen contact region fd and the iliac contact region fi, and the lower abdomen elastic elastic member is located at the center in the width direction overlapping the interior body 200. In order to improve the fit in the lower abdomen contact region fd, as shown in FIG. 9, the front end 201 (at least the front end of the absorbent body 56) of the interior body 200 is connected to the lower abdomen contact region fd. It is also preferable to provide the lower abdomen elastic elastic member 20 so as to be the same as or close to the crotch edge of the lower abdomen and to be continuous over the entire width direction of the lower abdomen contact region fd.

(Exterior sheet split structure)
In the above-described example, the front body F to the back body B are continuously covered with the integrated exterior sheet 12, but as shown in FIG. 14, the exterior sheet 12 covers the belly side of the wearer's waist. It is divided into an abdominal exterior sheet 12F that covers and a back exterior sheet 12B that covers the back side, and the front end of the interior body 200 is connected to the inner surface of the central part in the width direction of the abdominal exterior sheet 12F by a hot melt adhesive or the like. In addition, the rear end portion of the interior body 200 is connected to the inner surface of the central portion in the width direction of the back side exterior sheet 12B by a hot melt adhesive or the like, and the abdominal side exterior sheet 12F and the back side exterior sheet 12B are on the crotch side. It is also possible to adopt a form that is not continuous and spaced apart. This separation distance can be about 150 to 250 mm. In this case, the back surface of the liquid-impervious backsheet in the interior body 200 is a part of the portion exposed so as to cover the entire back surface of the interior body 200 or between the ventral exterior sheet 12F and the back exterior sheet 12B. The crotch outer sheet can also be fixed so as to cover a part or the whole. As the crotch outer sheet, the same material as that used for the outer sheet described above can be used.

  The form shown in FIG. 14 forms the whole abdominal exterior sheet | seat 12F with the elastic nonwoven fabric similar to the form shown in FIGS. 1-6, the front waist edge area | region fw and the lower abdominal part contact area | region fd in the said abdominal exterior sheet | seat 12F. The front waist edge elastic elastic member 17 and the lower abdominal elastic elastic member 20 are provided respectively, and a structure in which no elastic elastic member is provided in the iliac abutment region fi in the abdominal exterior sheet 12F is employed. 10 to 12, by laminating the sheet base material, and providing the front waist edge elastic elastic member 17, the iliac elastic elastic member 19 and the lower abdominal elastic elastic member 20 between them. The ventral exterior sheet 12F can also be configured.

(Post-processing tape)
A post-processing tape 70 (fixing means) can be provided at the center in the width direction on the outer surface of the rear body B of the exterior sheet 12. The post-processing tape 70 is for fixing the diaper 100 in a state where the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside. As shown in FIG. 5, in the general post-processing tape 70, a base end portion 71 is fixed to the outer surface of the exterior sheet 12 with an adhesive or the like, and a portion on the front end side of the base end portion 71 is tri-folded. (Folded in a Z-shaped cross section) or folded in half, and the portion between the folded portions is fixed (temporarily fixed) by the temporary fixing adhesive 72 so as to be peelable. Moreover, while having the knob | pick part 73 colored in opaque colors, such as white, in the front-end | tip part, the part except this knob | pick part 73 is transparent or semi-transparent, Through the transparent or semi-transparent part in this post-processing tape 70, A design to be described later is visible from the outer surface side of the post-processing tape 70. Although a specific structure can be appropriately configured, in the illustrated embodiment, the whole is formed by connecting a plurality of transparent or semi-transparent substrates in the longitudinal direction, and a colored tape 74 is bonded to the knob 73. Is adopted.

  At the time of disposal, the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside, and then the folded portion of the post-processing tape 70 is peeled off and spread, and the diaper 100 is rolled or folded. The diaper 100 is fixed with an adhesive so as to be wound from the rear body B of the diaper 100 to the outer surface on the opposite side over the waist opening WO. The post-processing tape 70 is particularly preferably a tri-fold shape that can be folded compactly when not in use and can be expanded into a long shape when in use.

  Fixing means such as the post-processing tape 70 may be provided on the front body F or on both the back body B and the front body F.

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

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious back sheet, 12 ... Exterior sheet, 12r ... Folded part, 25 ... Print sheet, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... packaging sheet, 60 ... side barrier cuff, 62 ... barrier sheet, fw ... front waist edge region, fi ... iliac contact region, fd ... lower abdomen contact region, bw ... back waist edge region, bi ... Rear intermediate region, bd ... rear lower end region.

Claims (5)

The side seal part is formed by joining the both sides of the exterior sheet forming the front body extending from the crotch part to the ventral side and the both sides of the exterior sheet forming the back body extending from the crotch part to the back side. A pants-type disposable diaper in which a waist opening for passing a wearer's torso and a pair of left and right leg openings for passing a leg are formed, and an interior body including an absorbent body is provided inside the exterior sheet In
Of the exterior sheet forming the front body and the exterior sheet forming the back body, at least the longitudinal regions having the side seal portions are configured to elastically expand and contract in the width direction, respectively.
The longitudinal region having the side seal portion of the exterior sheet forming the front body is located on the crotch side from the front waist edge region that forms the edge of the waist opening, and the front waist edge region. An iliac abutment region that abuts against the iliac region of the body, and a lower abdomen abutment region that abuts the lower abdomen of the wearer,
F _{fw is} the tensile force during elastic deformation in the width direction of the front waist edge region, F _{fi is} the tensile force during elastic deformation in the width direction of the iliac contact region, and elastic deformation in the width direction of the lower abdomen contact region. When the tensile force is F _fd , it is configured to satisfy the relationship of F _fd > F _fw > F _fi .
A pants-type disposable diaper characterized by that. The longitudinal region having the side seal portion of the exterior sheet forming the back body is a rear waist edge region corresponding to the front waist edge region, a rear intermediate region corresponding to the iliac contact region, A rear lower end side region corresponding to the lower abdomen contact region,
F _{bw is} the tensile force during elastic deformation in the width direction of the rear waist edge region, F _{bi is} the tensile force during elastic deformation in the width direction of the rear intermediate region, and tensile force during elastic deformation in the width direction of the rear lower end region. the when the _{F bd, F fd = F bi} = F bd> F fw = F bw> was configured to satisfy the relation of F _fi, pants-type disposable diaper according to claim 1, wherein. The exterior sheet that forms the front body includes at least a front waist edge region, an iliac abutment region, and a lower abdomen abutment region that are integrally stretchable nonwoven fabric, and a front waist edge region in the stretch nonwoven fabric that is vertically spaced. Elongated front waist edge elastic elastic members along a number of width directions fixed at intervals, and elongates along a number of width directions fixed at intervals in the lower abdomen abutment region in the elastic nonwoven fabric And has an elastic elastic member in the iliac abutment region in the elastic nonwoven fabric,
By differentiating at least one of the longitudinal arrangement interval, the thickness, the elongation rate at the time of fixation, and the number between the front waist edge elastic elastic member and the lower abdominal elastic elastic member, the F _fd > F _fw The underpants-type disposable diaper according to claim 1 or 2, configured to satisfy a relationship of> F _fi .   The exterior sheet forming the back body has a longitudinally spaced space between an integral sheet base material extending at least a rear waist edge region, a rear intermediate region and a rear lower end side region, and a rear waist edge region of the sheet base material. A plurality of elongated rear waist edge elastic elastic members along the width direction fixed in the width direction extended state, and fixed in the width direction extended state with a space in the rear intermediate region of the sheet base material in the vertical direction. A plurality of elongated first post-elastic elastic members along the width direction, and a plurality of elongated along the width direction fixed in the width direction extending in the longitudinal direction at the rear lower end side region of the sheet base material The underpants type disposable diaper of Claim 3 which has a 2nd elastic elastic member after a shape. The exterior sheet that forms the front body is an integral sheet base material extending at least over the front waist edge region, the iliac contact region, and the lower abdomen contact region, and the front waist edge region of the sheet base material in the longitudinal direction. A number of elongated front waist edge elastic elastic members along the width direction, which are fixed in an extended state in the width direction at intervals, and a width direction in the longitudinal direction at the iliac contact region in the sheet base material Numerous elongated iliac elastic members extending in the width direction fixed in the stretched state, and many fixed in the widthwise stretched state in the lower abdomen abutment region of the sheet base material in the longitudinal direction. An elongated lower abdomen elastic elastic member along the width direction of
By differentiating at least one of the longitudinal arrangement interval, the thickness, the elongation rate at the time of fixation, and the number among the three members of the front waist edge elastic elastic member, the iliac elastic elastic member and the lower abdominal elastic elastic member the F _fd> F _fw> was configured to satisfy the relation of F _fi, claim 1 or 2 pants-type disposable diaper according.

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