WO2021059956A1

WO2021059956A1 - Pull-up disposable diaper

Info

Publication number: WO2021059956A1
Application number: PCT/JP2020/033901
Authority: WO
Inventors: 康宏荒木
Original assignee: 大王製紙株式会社
Priority date: 2019-09-26
Filing date: 2020-09-08
Publication date: 2021-04-01
Also published as: JP7336334B2; TW202112327A; JP2021049284A

Abstract

[Problem] To improve the ability of covering buttocks. [Solution] In order to solve the above problem: a front exterior body 12F and a back exterior body 12B each have a waist-area stretch region A2 that is elastically stretchable in the width direction WD; an interior body 200 has side flaps 70 each having a side stretch region SG elastically stretchable in the longitudinal direction LD; the side flaps 70 have back joining regions 70B that are joined with the lower end part 14 of the back exterior body 12B; the back joining regions 70B are, together with the waist area stretch region A2 of the back exterior body 12B, shrunk in the width direction WD, and are stretchable in the width direction WD; and the tensile strength of the back exterior body 12B obtained by stretching the lower end part 14 in the width direction WD to the elasticity limit thereof and then shrinking the same to a 3/4 size thereof is less than that of the front exterior body 12F.

Description

Pants type disposable diapers

The present invention relates to a pants-type disposable diaper having a two-part exterior structure with improved buttock coverage.

Pants-type disposable diapers with a two-piece exterior structure are such that the front exterior body that constitutes at least the waist circumference of the front body, the rear exterior body that constitutes at least the waist circumference of the back body, and the front exterior body to the rear exterior body. It is provided with an interior body including an absorber attached to the exterior body, and both sides of the front exterior body and both sides of the rear exterior body are joined to form a side seal, whereby the waist opening and the left and right sides are formed. A pair of leg openings are formed (see, for example, Patent Document 1).

In such pants-type disposable diapers, it is common to provide elastic structures on the front and rear exteriors in order to improve the fit to the body. For example, a waist area that is defined as a range in the front-rear direction corresponding to the side seal, or an intermediate area that is located between the front and rear waist areas and has a stretchable area that expands and contracts in the width direction has a relatively good fit to the body. It is expensive.

On the other hand, with the pants-type disposable diaper that is divided into two parts, the fit of the leg opening has to be reduced. That is, since the distance from the position corresponding to the inseam of the interior body to the intersection position between the interior body and the exterior body is long in the pants-type disposable diaper of the exterior two-piece type, the interior body swings left and right with the intersection position as a fulcrum. Because it is easy to handle, the interior body is easier to move in the lateral direction compared to the type that has an integrated outer body that is continuous from the front body to the back body. In addition, the pants-type disposable diaper of the exterior two-piece type has a shape in which the crotch-side edge of the exterior body is straight or close to the width direction, and intersects the side edge of the interior body at a right angle or an angle close to it. .. These mean that, among the edges of the leg openings, the fit tends to be insufficient in the vicinity of the intersection position between the side edge of the interior body and the crotch side edge of the exterior body.

On the other hand, on both sides of the interior body, side flaps extending laterally from the rising gathers extend in the front-rear direction from the front exterior body to the rear exterior body, and the side flaps elastically expand and contract in the front-rear direction. When the side expansion / contraction area is provided, the side expansion / contraction area elastically supports the lateral movement of the interior body, and the side expansion / contraction area covers the side of the interior body, so that a gap is generated on the side of the interior body. It is preferable because it becomes difficult.

Here, in order to fully exert the fit of the side expansion / contraction region, it is preferable that the inner / outer joint portion where the interior body and the exterior body are joined extends to the side flap.

However, if the inner / outer joint portion has an overlapping portion between the expansion / contraction region of the exterior body and the side expansion / contraction region of the interior body, the side flaps of the interior body contract in the width direction, and the cover width by the side flaps becomes narrow. It ends up. In particular, if the width of the cover by the side flaps of the interior body is narrowed at the back body, there is a problem that the interior body easily bites into the intergluteal cleft because the buttocks cannot be covered over a wide area.

Japanese Patent No. 5790031

Therefore, the main subject of the present invention is to improve the covering property of the buttocks and the like.

The pants-type disposable diapers that solve the above problems are as follows.
<First aspect>
The front exterior body that constitutes at least the waist circumference of the front body, and the rear exterior body that constitutes at least the waist circumference of the back body,
An interior body including an absorber provided from the front exterior body to the rear exterior body, and
An inner / outer joint portion to which the interior body, the front exterior body, and the rear exterior body are joined, respectively.
A side seal in which both side portions of the front exterior body and both side portions of the rear exterior body are joined, respectively.
With a waist opening and a pair of left and right leg openings
The front exterior body and the rear exterior body elastically expand and contract in the width direction including the lower end portion defined as the most leg opening side portion when the front-rear direction range having the side seal is divided into four equal parts in the front-rear direction. It has a stretchable area around the waist and
On both sides of the interior body, side flaps extending laterally from the absorber extend in the front-rear direction from the front exterior body to the rear exterior body.
The side flap has a side elastic region that elastically expands and contracts in the front-rear direction at least in a portion between a portion that overlaps the front exterior body and a portion that overlaps the rear exterior body.
The elastic region around the waist of the rear exterior body is provided at least in a portion overlapping the left and right side flaps.
The left and right side flaps have a post-joining region joined with a portion including the lower end of the rear exterior body.
The post-joining region is contracted in the width direction and is expandable in the width direction together with the elastic region around the waist of the rear exterior body.
The tensile force when the lower end of the front exterior body is extended to the elastic limit in the width direction and then contracted to the dimension of 3/4 of the extension causes the lower end of the rear exterior body to reach the elastic limit in the width direction. It is larger than the tensile force when it is stretched and then shrunk to its 3/4 size.
Pants-type disposable diapers that feature this.

(Action effect)
In this pants-type disposable diaper, the rear joint region of the side flap contracts in the width direction together with the elastic region around the waist of the rear exterior body in the state of natural length (before wearing). Here, in this pants type disposable diaper, the tensile force when the lower end of the front exterior body is extended to the elastic limit in the width direction and then contracted to the dimension of 3/4 of that is the lower end portion of the rear exterior body. Is larger than the tensile force when it is stretched to the elastic limit in the width direction and then contracted to the dimension of 3/4 of that, so that the lower end of the rear exterior body is larger than the lower end of the front exterior body in the mounted state. Stretched in the width direction (stretched longer). As a result, the posterior junction region of the side flaps expands more in the width direction, the side flaps cover the buttocks more extensively, and the interior body is less likely to bite into the intergluteal cleft.
The "tensile force when the diaper is stretched to the elastic limit in the width direction and then contracted to the dimension of 3/4" is the state when the wearer of the conforming size wears the general pants type disposable diaper. Is assumed.

<Second aspect>
The tensile force when the lower end of the front exterior body is extended to the elastic limit in the width direction and then contracted to the dimension of 3/4 of the extension causes the lower end of the rear exterior body to reach the elastic limit in the width direction. It is 1.3 to 3.0 times the tensile force when it is stretched and then shrunk to its 3/4 size.
The pants-type disposable diaper of the first aspect.

(Action effect)
The difference in tensile force between the lower end portion of the front exterior body and the lower end portion of the rear exterior body may be appropriately determined, but is usually preferably within the range of this embodiment.

<Third aspect>
The widthwise dimension of the post-joining region is 0.8 to 1 times the widthwise dimension of the side flaps.
Pants-type disposable diaper according to the first or second aspect.

(Action effect)
The width direction of the post-joining region can be appropriately determined, but it is preferably sufficiently wide, and usually, it is preferably within the range of this embodiment.

<Fourth aspect>
The front exterior body and the rear exterior body are rectangular in which the dimensions in the front-rear direction and the dimensions in the width direction are the same.
The dimensions of the front exterior body and the rear exterior body in the front-rear direction are 0.2 to 0.4 times the total length of the product.
A pants-type disposable diaper according to any one of the first to third aspects.

(Action effect)
In order to reduce the amount of material used for the exterior body and to have a simple structure, it is preferable that the front exterior body and the rear exterior body are rectangular in which the dimensions in the front-rear direction and the dimensions in the width direction are the same. In such a design, the appropriate front-rear dimensions of the front and rear exteriors are 0.2 to 0.4 times the overall length of the product. In this case, the covering property of the buttocks is lowered only by the rear exterior body, but the covering property of the buttocks can be supplemented by the side flap of the interior body described above.

<Fifth aspect>
The elastic region around the waist of the front exterior body is provided at least in a portion overlapping the left and right side flaps.
The left and right side flaps have a front joining region joined to a portion including the lower end of the front exterior body.
The front joint region is contracted in the width direction and is expandable in the width direction together with the elastic region around the waist of the front exterior body.
A pants-type disposable diaper according to any one of the first to fourth aspects.

(Action effect)
In this pants-type disposable diaper, the front joint area of the side flap contracts in the width direction together with the elastic area around the waist of the front exterior body in the state of natural length (before wearing). Here, in this pants type disposable diaper, the tensile force when the lower end of the front exterior body is extended to the elastic limit in the width direction and then contracted to the dimension of 3/4 of that is the lower end portion of the rear exterior body. Is larger than the tensile force when it is stretched to the elastic limit in the width direction and then contracted to the dimension of 3/4 of that, so that the lower end of the rear exterior body is larger than the lower end of the front exterior body in the mounted state. Stretched in the width direction (stretched longer). As a result, although the pre-joining region of the side flap expands in the width direction, it does not expand more than the post-joining region, so that the side flap expands to the inguinal region as compared with the case where the pre-joining region and the post-joining region expand to the same extent. On the other hand, it fits better.
<Sixth aspect>
The side expansion / contraction region is a region in which one or a plurality of elongated side elastic members are provided on the side flap along the front-rear direction and at intervals from each other.
The side flap has a hollow portion extending in the front-rear direction from the front joining region to the back joining region along its side edge.
Due to the contraction of the side elastic member, the portion of the side flap including the hollow portion contracts in the front-rear direction to form side gathers.
A pants-type disposable diaper according to any one of the first to fifth aspects.

(Action effect)
In this disposable wearable article, due to the contraction of the side elastic member, the portion including the hollow portion along the side flap contracts in the front-rear direction, and the folds of the side gathers are formed side by side in the front-rear direction. Here, when side gathers are formed in the portion of the side flap including the hollow portion, the folds of the side gathers are formed by the hollow portion greatly swelling, and become large and soft (that is, rich in cushioning property). Therefore, this large and soft fold makes the side of the crotch feel good (it becomes fluffy and fluffy).
In particular, as described above, in the mounted state, the elastic region around the waist of the rear exterior body extends in the width direction (extends longer) than the elastic region around the waist of the front exterior body, and the rear joining region of the side flaps extends in width. Since it expands more in the direction, the bulge of the hollow portion becomes closer to flat toward the post-joining region, and the fit to the buttocks becomes better.
Further, in the case of the sixth aspect, the width of the side flap becomes narrower from the rear to the front, and the bulge of the hollow portion becomes larger from the back to the front, so that the fit to the inguinal region is particularly good.

According to the present invention, there are advantages such as improved coverage of the buttocks.

It is a top view which shows the inner surface of the pants type disposable diaper in the unfolded state. It is a top view which shows the outer surface of the pants type disposable diaper in the unfolded state. It is a 2-2 sectional view of FIG. It is a cross-sectional view of 3-3 of FIG. (A) is a 4-4 cross-sectional view of FIG. 1, and (b) is a 5-5 cross-sectional view of FIG. It is a perspective view of a pants type disposable diaper. It is a top view which shows the outer surface of the interior body in a developed state together with the outline of the exterior body. It is a top view which shows the outer surface of the interior body in the unfolded state together with the outline of the exterior body. It is a cross-sectional view of another example corresponding to the 2-2 cross section of FIG. FIG. 5 is a cross-sectional view of another example corresponding to the 3-3 cross section of FIG. FIG. 3 is an enlarged cross-sectional view of a main part of FIG. FIG. 9 is an enlarged cross-sectional view of a main part of FIG. It is sectional drawing which enlarges and shows the part which has a post-joining area. It is sectional drawing which shows the part which has a pre-joining area enlarged. It is a top view which shows the part which has a post-joining area in an enlarged manner. It is a top view which shows the part which has a pre-junction area in an enlarged manner. It is a top view which shows the mounting state schematicly. It is a front view which shows the method of a tensile test schematicly.

Below, an example of a pants-type disposable diaper will be explained in detail with reference to the attached drawings. The dotted pattern portion in the cross-sectional view shows an adhesive as a joining means for joining the constituent members located on the front side and the back side thereof, and is a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating. (Transfer of hot melt adhesive by letterpress method) or the fixed part of the elastic member is formed by coating the elastic member on the outer peripheral surface of the elastic member such as comb gun or sure wrap coating instead of or together with this. is there. Examples of the hot melt adhesive include EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type and the like, but they can be used without particular limitation. As a joining means for joining each component, a means by material welding such as a heat seal or an ultrasonic seal can also be used.

FIGS. 1 to 6 show an example of a pants-type disposable diaper. This pants-type disposable diaper has a rectangular front exterior body 12F that constitutes at least the waist circumference of the front body F, a rectangular rear exterior body 12B that constitutes at least the waist circumference of the back body B, and a crotch from the front exterior body 12F. It is provided with an interior body 200 provided on the

exterior bodies

12F and 12B so as to extend through the portion to the rear exterior body 12B. Both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form a side seal 12A, whereby an opening formed by the front and rear ends of the

exterior bodies

12F and 12B is formed by the wearer. The waist opening WO through which the body passes, and the portions surrounded by the lower edges of the

exterior bodies

12F and 12B and the side edges of the interior body 200 on both sides in the width direction of the interior body 200 are leg openings LO through which the legs pass. The interior body 200 is a part that absorbs and holds excrement such as urine, and the

exterior bodies

12F and 12B are parts for supporting the interior body 200 with respect to the wearer's body. Further, the reference numeral Y indicates the total length of the diaper in the unfolded 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 rear body B), and the reference numeral X indicates the diaper in the unfolded state. Shows the full width of.

This pants type disposable diaper has a waist circumference region T defined as a front-rear direction range having a side seal 12A (a front-rear direction range from the waist opening WO to the upper end of the leg opening LO) and a front-back direction range of a portion forming the leg opening LO. It has an intermediate region L defined as (between the front-rear region having the side seal 12A of the front body F and the front-rear region having the side seal 12A of the back body B). The waist circumference region T can be divided into a "waist portion" W that conceptually forms an edge portion of the waist opening and a "waist lower portion" U that is a portion below the waist portion. Normally, when there is a boundary in the waist circumference region T where the tensile stress in the width direction changes (for example, the thickness and elongation rate of the elastic member change), the waist opening WO side is the waist rather than the boundary on the waist opening WO side. If there is no such boundary, the waist extending portion 12E extending toward the waist opening WO side from the absorber 56 or the interior body 200 becomes the waist portion W. These lengths in the front-rear direction vary depending on the size of the product and can be appropriately determined. For example, the waist portion W can be 15 to 40 mm and the waist lower portion U can be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are constricted in a U-shape or a curved shape along the circumference of the wearer's legs, and this is a portion for inserting the wearer's legs. As a result, the unfolded pants-type disposable diaper has an hourglass shape as a whole.

(Interior body)
The interior body 200 can take any shape, but in the illustrated example, it is substantially rectangular. As shown in FIGS. 3 to 5, the interior body 200 includes a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbing element 50 interposed between them. Yes, it has an absorption function. Reference numeral 40 indicates an intermediate sheet provided between the top sheet 30 and the absorption element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorption element 50, and reference numeral 60 indicates an interior body. In order to prevent excrement from leaking to both sides of the 200, the rising gathers 60 extending from both sides of the interior body 200 so as to be in contact with the wearer's legs are shown.

The size of the width direction WD of the interior body 200 can be appropriately determined, but for example, it can be 1 to 1.5 times the size of the width direction WD of the absorber 56.

(Top sheet)
The top sheet 30 has a property of allowing liquid to permeate, and examples thereof include a perforated or non-perforated non-woven fabric and a porous plastic sheet. Further, the top sheet 30 may be made of one sheet or may be made of a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the plane direction.

Both sides of the top sheet 30 may be folded back on the side edge of the absorbing element 50, or may be projected laterally from the side edge of the absorbing element 50 without being folded back.

The top sheet 30 may be fixed to a member adjacent to the back side by a joining means by material welding such as a heat seal or an ultrasonic seal, or by a hot melt adhesive for the purpose of preventing misalignment with respect to the member on the back side. desirable. In the illustrated example, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the packaging sheet 58 located on the front side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(Intermediate sheet)
In order to quickly transfer the liquid that has permeated the top sheet 30 to the absorber, an intermediate sheet (also referred to as a "second sheet") 40 having a faster liquid permeation speed than the top sheet 30 can be provided. The intermediate sheet 40 is for quickly transferring the liquid to the absorber 56 to improve the absorption performance by the absorber 56 and to prevent the absorbed liquid from returning from the absorber 56. The intermediate sheet 40 may be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace non-woven fabric, spunbonded non-woven fabric, SMS non-woven fabric, pulp non-woven fabric, mixed sheet of pulp and rayon, point-bonded non-woven fabric or crepe paper. In particular, the air-through non-woven fabric is preferable because it is bulky. It is preferable to use a composite fiber having a core-sheath structure for the air-through non-woven 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 17 ~ 80g / m ^2, more preferably 25 ~ 60g / m ^2. The thickness of the raw material fiber of the non-woven fabric is preferably 2.0 to 10 dtex. In order to make the non-woven fabric bulky, it is also preferable to use eccentric fibers having no core in the center, hollow fibers, and eccentric and hollow fibers as mixed fibers of all or a part of the raw material fibers.

Although the intermediate sheet 40 in the illustrated example is arranged in the center shorter than the width of the absorber 56, it may be provided over the entire width. The length of the intermediate sheet 40 in the front-rear direction may be the same as the total length of the diaper, may be the same as the length of the absorbing element 50, or may be within a short length range centered on the region for receiving the liquid.

The intermediate sheet 40 may be fixed to a member adjacent to the back side by a joining means by material welding such as a heat seal or an ultrasonic seal or a hot melt adhesive for the purpose of preventing misalignment with respect to the member on the back side. desirable. In the illustrated example, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorber 56 by the hot melt adhesive applied to the back surface thereof.

(Liquid impermeable sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited, but for example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated non-woven fabric in which a plastic film is provided on the surface of the non-woven fabric, or a plastic film. An example is a laminated sheet in which a non-woven fabric or the like is laminated and bonded to the surface. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impermeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching it in a uniaxial or biaxial direction. Is widely used. In addition to this, methods such as non-woven fabrics using microdenyl fibers, strengthening of leakage resistance by reducing the voids of the fibers by applying heat or pressure, and coating of highly water-absorbent resin or hydrophobic resin or water-repellent agent. Therefore, a liquid-impermeable sheet without using a plastic film can also be used as the liquid-impermeable sheet 11, but it has sufficient adhesive strength when bonded to the cover non-woven fabric 13 described later via a hot-melt adhesive. Therefore, it is desirable to use a resin film.

As shown in the figure, the liquid-impermeable sheet 11 has a width that fits on the back side of the absorbing element 50, and in order to improve leakage resistance, both sides of the absorbing element 50 are wrapped around the side surface of the top sheet 30 of the absorbing element 50. It can also be extended to both sides. The width of the extending portion is appropriately about 5 to 20 mm on each of the left and right sides.

(Absorption element)
The absorbing element 50 has an absorbing body 56 and a packaging sheet 58 that encloses the entire absorbing body 56. The packaging sheet 58 may be omitted.

(Absorber)
The absorber 56 can be formed by an aggregate of fibers. The fiber aggregate is obtained by stacking short fibers such as cotton-like pulp and synthetic fibers, and by opening the tow (fiber bundle) of synthetic fibers such as cellulose acetate as necessary. Can also be used. ^{The fiber basis weight can be, for example, about 100 to 300 g / m 2} when stacking cotton-like pulp or short fibers, and about 30 to 120 g / m ^{2 for filament aggregates, for example.} Can be done. In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The degree of crimping of the crimped fibers can be, for example, 5 to 75 fibers per 2.54 cm, preferably 10 to 50 fibers, and more preferably about 15 to 50 fibers. In addition, uniformly crimped crimped fibers can be used. It is preferable to disperse and hold the highly absorbent polymer particles in the absorber 56.

The absorber 56 may have a rectangular shape, but as shown in FIG. 7 and the like, if the absorber 56 has an hourglass shape having a constricted portion 56N narrower than both front and rear sides in the middle in the front-rear direction, the absorber 56 itself This is preferable because the fit of the rising gather 60 around the legs is improved.

Further, although the dimensions of the absorber 56 can be appropriately determined, it is preferable that the absorber 56 extends from a position overlapping the front exterior body to a position overlapping the rear exterior body through the crotch portion, and the LD and width in the front-rear direction as shown in the illustrated example. In the direction WD, it can extend to the peripheral portion of the interior body 200 or its vicinity. Reference numeral 56X indicates the entire width of the absorber 56.

(Highly absorbent polymer particles)
The absorber 56 may contain highly absorbent polymer particles in part or all of it. The highly absorbent polymer particles include "powder" in addition to "particles". As the highly absorbent polymer particles, those used for this kind of disposable diaper can be used as they are, for example, sieved by sieving (shaking for 5 minutes) using a standard sieve (JIS Z8801-1: 2006) of 500 μm. It is desirable that the proportion of particles remaining in the sieve is 30% by weight or less, and the particles falling under the sieve by this sieving are sieved using a standard sieve of 180 μm (JIS Z8801-1: 2006) (shaking for 5 minutes). It is desirable that the proportion of particles remaining on the sieve is 60% by weight or more.

The material of the highly absorbent polymer particles can be used without particular limitation, but a material having a water absorption of 40 g / g or more is preferable. Highly absorbent polymer particles include starch-based, cellulosic-based and synthetic polymer-based ones, which are starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and crosslinked sodium carboxymethyl cellulose. A substance or an acrylic acid (salt) polymer or the like can be used. As the shape of the highly absorbent polymer particles, a commonly used powder or granular material is preferable, but other shapes can also be used.

As the highly absorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less, are preferably used. If the water absorption rate is too slow, 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 highly absorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the bulky absorber 56 is used, the sticky feeling after liquid absorption can be effectively suppressed.

The basis weight of the highly absorbent polymer particles can be appropriately determined according to the amount of absorption required for the application of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the basis weight of the polymer ^{is less than 50 g / m 2} , it becomes difficult to secure the absorption amount. Above 350 g / m ² , the effect saturates.

(Packaging sheet)
When the packaging sheet 58 is used, as the material thereof, tissue paper, particularly crepe paper, non-woven fabric, non-woven fabric of polylami, a sheet having small holes, or the like can be used. However, it is desirable that the sheet does not allow the highly absorbent polymer particles to escape. When a non-woven fabric is used instead of the crepe paper, a hydrophilic SMS non-woven fabric (SMS, SMSMS, etc.) is particularly suitable, and polypropylene, polyethylene / polypropylene composite material, or the like can be used as the material. The basis weight is preferably 5 to 40 g / m ² , especially 10 to 30 g / m ² .

The packaging structure of the packaging sheet 58 can be appropriately determined, but from the viewpoint of ease of manufacture and prevention of leakage of highly absorbent polymer particles from the front and rear edge edges, a cylinder is provided so as to surround the front and back surfaces and both side surfaces of the absorber 56. It is preferable that the materials are wound in a shape, the front and rear edges thereof are projected from the front and rear of the absorber 56, and the overlapping portions and the overlapping portions of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(Get up gather)
The rising gather 60 has a rising portion 68 that rises from the side portion of the interior body 200, and the rising portion 68 contacts the range from the inguinal region of the wearer to the buttocks via the legs to prevent lateral leakage. It is a thing. In the raised gather 60 of the illustrated example, the base side portion 60B stands up diagonally toward the center side in the width direction, and the tip end side portion 60A stands up diagonally toward the outside in the width direction from the middle portion. It is not limited, and it is possible to make appropriate changes such as those standing on the center side in the width direction as a whole.

More specifically, in the raised gather 60 of the illustrated example, a strip-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 is folded back in the width direction WD at the tip portion and folded in two. Along with stacking, a plurality of elongated gather elastic members 63 are fixed in a stretched state along the longitudinal direction between the folded portion and the sheets in the vicinity thereof at intervals in the width direction WD. The base end portion (the end portion opposite to the seat folded portion in the width direction WD) located on the side opposite to the tip portion of the rising gather 60 is a root portion 65 fixed to the side portion of the interior body 200. The portion other than the root portion 65 is a main body portion 66 (a portion on the folded-back portion side) extending from the root portion 65. Further, the main body portion 66 has a root side portion 60B extending toward the center in the width direction and a tip side portion 60A folded back at the tip of the root side portion 60B and extending outward in the width direction. The front-rear direction intermediate portion of the main body portion 66 is fixed to the side surface of the top sheet 30 in the front-rear direction, while the front-rear direction intermediate portion located between them is not fixed. A gathered elastic member 63 along the front-rear direction LD is fixed to at least the tip of the raised portion 68 in an extended state.

In the rising gather 60 configured as described above, the rising portion 68 rises so as to come into contact with the skin as shown by the arrow in FIG. 3 due to the contraction force of the gather elastic member 63.

Like the rising gather 60 in the illustrated example, the main body portion 66 is bent by a root side portion 60B extending toward the center in the width direction and a tip side portion 60A folded back at the tip of the root side portion 60B and extending outward in the width direction. In the structure, the tip side portion 60A and the root side portion 60B are joined to the top sheet 30 in the downturned state at the downside portion 67, and the base side portion 60B is joined to the top sheet 30 in the downturned state. At least one of hot melt adhesives by various coating methods and material welding means such as heat sealing and ultrasonic sealing can be used for joining the facing surfaces in the inverted portion 67. In this case, the joining of the root side portion 60B and the top sheet 30 and the joining of the tip side portion 60A and the root side portion 60B may be performed by the same means or by different means. For example, it is preferable that the root side portion 60B and the top sheet 30 are joined by a hot melt adhesive, and the tip side portion 60A and the root side portion 60B are joined by material welding.

As the gather sheet 62, a flexible, uniform and concealing non-woven fabric such as a spunbonded non-woven fabric (SS, SSS, etc.), an SMS non-woven fabric (SMS, SMSMS, etc.), a melt-blown non-woven fabric, etc. The treated one can be preferably used. In this case, the fiber basis weight of the non-woven fabric is preferably about ^{10 to 30 g / m 2.} As the gather elastic member 63, thread rubber 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 of the gathered elastic member 63 in the attached state is preferably 150 to 350%, more preferably 200 to 300%. The number of gather elastic members 63 is preferably 2 to 6, and more preferably 3 to 5. The arrangement interval 60d of the gather elastic member 63 is appropriately 3 to 10 mm. With this configuration, the gathered elastic member 63 can easily hit the skin in the area where the gathered elastic member 63 is arranged. The gather elastic member 63 may be arranged not only on the tip side but also on the base side.

In the rising portion 68 of the rising gather 60, a hot melt adhesive, a heat seal, and ultrasonic waves are used for bonding the inner layer and the outer layer of the gather sheet 62 and fixing the gather elastic member 63 sandwiched between them by various coating methods. At least one of the fixing means by welding the material such as a seal can be used. If the entire inner and outer layers of the gather sheet 62 are bonded together, the flexibility is impaired. Therefore, it is preferable that the parts other than the adhesive portion of the gather elastic member 63 are not adhered or are weakly adhered. In the illustrated example, the gather elastic member 63 is sandwiched between the inner layer and the outer layer of the gather sheet 62 by applying a hot melt adhesive only to the outer peripheral surface of the gather elastic member 63 by a coating means such as a comb gun or a sure wrap nozzle. The structure is such that the gather elastic member 63 is fixed to the inner layer and the outer layer of the gather sheet 62 and the inner layer and the outer layer of the gather sheet 62 are fixed only by the hot melt adhesive applied to the outer peripheral surface of the gather sheet 62. There is.

Similarly, for fixing the inverted portion 67, at least one of a hot melt adhesive by various coating methods and a means by welding materials such as heat seal and ultrasonic seal can be used.

(Side flap)
Side flaps 70 extending to the side of the absorber 56 are provided on both sides of the interior body 200. As shown in the illustrated example, each side flap 70 is preferably a flat portion extending only to the side without folding back or the like. The size of the width direction WD of each side flap 70 can be appropriately determined, and can be, for example, 0.1 to 0.2 times the size of the width direction WD of the interior body 200.

Further, each side flap 70 has a side expansion / contraction region SG that elastically expands / contracts in the front-rear direction LD at least in a portion between a portion overlapping the front exterior body 12F and a portion overlapping the rear exterior body 12B. In the side expansion / contraction region SG, one or a plurality of elongated side elastic members 73 are provided along the front-rear direction LD and at intervals from each other, and are contracted in the front-rear direction by the side elastic members and in the front-rear direction. It can be an extendable region. Further, each side flap 70 preferably has a hollow portion 70H that follows the front-rear LD along its side edge. Due to the contraction of the side elastic member 73, the portion of the side flap 70 including the hollow portion 70H contracts in the front-rear direction LD, and a side gather in which a large number of folds are lined up in the front-rear direction LD is formed. Here, when side gathers are formed in the portion of the side flap 70 including the hollow portion 70H, as shown in FIG. 6, the folds of the side gathers are formed by the hollow portion 70H being greatly expanded, and are large and soft (that is, cushion). It will be (rich in sex). Therefore, this large and soft fold makes the side of the crotch feel good (it becomes fluffy and fluffy).

The side flap 70 has a first sheet layer 71 facing the back side of the side elastic member 73 and a second sheet layer 72 facing the front side of the side elastic member 73 in order to fix the side elastic member 73. preferable.

The sheet material forming the first sheet layer 71 and the second sheet layer 72 is not particularly limited, and an appropriate non-woven fabric such as the above-mentioned rising gather 60 and the non-woven fabric that can be used in the above-mentioned

exterior bodies

12F and 12B can be selected. .. In the examples shown in FIGS. 3, 4 and 11, as will be described later, the gather sheet 62 of the rising gather 60 is extended to form the first sheet layer 71 and the second sheet layer 72. As shown in FIGS. 9, 10 and 12, a special sheet material 79 different from the rising gather 60 may be added to construct the side flap 70. In the former case, the front and rear ends of the side flap 70 coincide with the front and rear ends of the raised gather 60 (that is, the front and rear ends of the interior body 200 in this case), but in the latter case, the front and rear ends of the side flap 70 are raised and front and rear of the raised gather 60. It may be located on the center side in the front-rear direction from the edge.

The side elastic member 73 is not particularly limited, and an elongated elastic member similar to the gather elastic member 63 described above can be used. The elongation rate of the side elastic member 73 in the side expansion / contraction region SG in the unfolded state is preferably 150 to 350%, more preferably 200 to 270%. The number of side elastic members 73 is preferably 2 to 16, more preferably 6 to 10. The arrangement interval of the side elastic members 73 is preferably 5 to 10 mm. In particular, when a plurality of side elastic members 73 are provided at intervals in the width direction WD, the extension rate of the side elastic members 73 in the side expansion / contraction region SG in the deployed state is lower as it is located on the side. This is preferable because the elastic region SG rises slowly toward the skin and the side elastic region SG tends to be in an appropriate wearing state. If the side expansion / contraction region SG rises too tightly, the side flap 70 may fold inward and be sandwiched between the leg and the surface of the disposable article, leading to leakage.

The side elastic member 73 is fixed to the first sheet layer 71 and the second sheet layer 72. Hot melt adhesive HM by various coating methods and material welding such as heat seal and ultrasonic seal for bonding the first sheet layer 71 and the second sheet layer 72 and fixing the side elastic member 73 sandwiched between them. Fixing means can be used. If the bonding area of the first sheet layer 71 and the second sheet layer 72 is large, the flexibility is impaired. Therefore, it is preferable that the parts other than the adhesive portion of the side elastic member 73 are not bonded or are weakly bonded. In the illustrated example, the hot melt adhesive HM is applied only to the outer peripheral surface of the side elastic member 73 by a coating means such as a comb gun or a sure wrap nozzle, and sandwiched between the first sheet layer 71 and the second sheet layer 72. The side elastic member 73 is fixed to the first sheet layer 71 and the second sheet layer 72 and the first sheet layer 71 and the second sheet layer are fixed only by the hot melt adhesive HM applied to the outer peripheral surface of the side elastic member 73. It has a structure for fixing between 72.

The attachment range of the side elastic member 73 in the front-rear direction LD, that is, the range of the front-rear direction LD of the side expansion / contraction region SG is from the portion overlapping the front exterior body 12F to the portion overlapping the rear exterior body 12B as shown in the illustrated example. However, the present invention is not limited to this. Therefore, for example, the front end of the side expansion / contraction region SG may be located at the rear end of the front exterior body, or may be located at the rear side of the rear end. Similarly, the rear end of the side telescopic region SG may be located at the front end of the rear exterior body, or may be located on the front side thereof. Further, it is preferable that the range of the front-rear direction LD of the side expansion / contraction region SG is the same as or more extended to both front-rear and front-rear sides than the contracted portion of the rising gather 60 by the gather elastic member 63.

The side flap 70 preferably has three or more sheet layers including the first sheet layer 71 and the second sheet layer 72. That is, in addition to the outermost sheet layer 74 and the innermost sheet layer 75, it is preferable to have at least one inner sheet layer 76 located between them. Some or all of these sheet layers may be formed of separate sheet materials, or one sheet material may be formed by being folded once or a plurality of times. The inner sheet layer 76 can be appropriately selected from the above-mentioned gather sheet 62, the liquid-impermeable sheet 11, or the same non-woven fabric as the

exterior bodies

12F and 12B described later, and the above-mentioned gather sheet 62 and the above-mentioned gather sheet 62. The liquid impermeable sheet 11 can be formed by appropriately extending or folding back.

The structure of the hollow portion 70H is not particularly limited, but it can be formed by, for example, the following laminated structure of sheet layers. That is, in the side flap 70 of the illustrated example, a non-joint portion 77 in which at least one of the outermost front side sheet layer 74 and the innermost back side sheet layer 75 and the inner sheet layer 76 overlapping the same is not joined is formed. The non-joint portion 77 is a portion that continuously or intermittently continues to the front-rear LD in the range of the width direction WD including the region between the side elastic member 73 located most laterally and the side edge of the side flap 70. is there. That is, as long as either one of the outermost sheet layer 74 and the innermost sheet layer 75 and the inner sheet layer 76 overlapping the non-bonded portion 77 are non-bonded, some or all of the other layers are bonded to each other. It may be formed, or all the sheet layers in the thickness direction may be unbonded. For example, in the non-joined portion 77 of the example shown in FIGS. 3, 4 and 11, the portion where the outermost sheet layer 74 and the inner sheet layer 76 overlapping the non-joined portion is not joined is the side elasticity most lateral to the side edge. The portion up to the fixed position of the member 73, in which the innermost sheet layer 75 and the inner sheet layer 76 overlapping the sheet layer 75 are not joined, continues to the central side in the width direction. In the non-joined portion 77 of the example shown in FIGS. 9, 10 and 12, the outermost sheet layer 74 and the inner sheet layer 76 overlapping the non-joined portion 77 are non-joined, and the innermost sheet layer 75 and the inner sheet overlapping therewith are not joined. The portion not joined to the layer 76 continues from the side edge to the center side in the width direction from the fixed position of the side elastic member 73 which is the most lateral to the side edge, but the former continues to the center side in the width direction. There is.

The size of the WD in the width direction of the non-joint portion 77 can be appropriately determined, but is preferably 2 to 15 mm, particularly preferably 5 to 10 mm. That is, the dimension of the WD in the width direction of the hollow portion 70H is preferably 2 mm or more. As shown in the illustrated example, when the rising gather 60 is provided, the central edge of the non-joining portion 77 in the width direction WD is located laterally from the boundary between the root portion 65 and the main body portion 66 (starting point of rising). Is preferable. Further, the dimension of the front-rear LD of the non-joint portion 77 (the dimension of the hollow portion 70H in the front-rear direction) is preferably 30% or more, particularly 40% or more of the total length Y of the product. Further, in the case of a pants-type disposable diaper in which the front exterior body 12F and the rear exterior body 12B are separated as shown in the illustrated example, the non-joint portion 77 is arranged in the front-rear direction LD to a position where it overlaps with the front exterior body 12F and the rear exterior body 12B, respectively. It is preferably extended. In this case, it is preferable that the non-joining portion 77 extends over the entire front-rear LD of the interior body 200. Further, the non-joining portion 77 extends only to a position between the front and rear edges of the interior body 200 and the

elastic members

16 and 19 on the LO side of the most leg opening of the front exterior body 12F and the rear exterior body 12B. Is also preferable. Further, the non-joining portion 77 is the

elastic members

16 and 19 on the most leg opening LO side of the front exterior body 12F and the rear exterior body 12B and the edges of the leg opening LO (the rear edge of the front exterior body 12F and the front of the rear exterior body 12B). It may extend only to the position between it and the edge.

On both sides of the non-joined portion 77 in the width direction WD, a gap between at least one of the outermost sheet layer 74 and the innermost sheet layer 75 and the inner sheet layer 76 overlapping the same is closed. As shown in the illustrated example, one side of the gap of the non-joint portion 77 can be closed by folding back the sheet material forming the outermost sheet layer 74 or the innermost sheet layer 75 at the side edge of the side flap 70. Further, the other side of the gap of the non-bonded portion 77 can be closed by joining the sheet layers adjacent to each other in the thickness direction at appropriate positions using a hot melt adhesive HM, welding means, or the like. Of course, both sides of the gap of the non-joint portion 77 can be closed by the same method, for example, folding back of the sheet material or hot melt adhesive HM.

As shown in the illustrated example, a non-joint portion 77 closed on both sides of the WD in the width direction is formed, and this non-joint portion 77 is between the side elastic member 73 located most laterally and the side edge of the intermediate region L. If the width direction WD range including the region (the width direction WD range equal to or greater than the region) continues to the anteroposterior LD, the side edge of the side flap is surrounded by a hollow portion 70H. Will follow the front-back LD. In this case, the folds formed on the side portion of the side flap are formed by a large bulge of at least one of the frontmost seat layer 74 and the innermost seat layer 75, and are large and soft (that is, rich in cushioning). It becomes. Therefore, since the large and soft folds are formed on the inside, outside, both inside and outside, or the entire thickness direction of the range including the side edge of the side flap 70, the end portion of the leg opening LO is soft to the touch.

The side elastic member 73 may be located near the side edge of the side flap 70, but the portion of the side flap 70 from the side edge to the center side in the width direction WD of 2 to 15 mm (particularly 5 to 10 mm) is , It is preferable not to include the side elastic member 73. Further, the portion from the side edge to the center side in the width direction WD from 2 to 15 mm (particularly 5 to 10 mm) preferably includes a part or all of the hollow portion 70H. When the side elastic member 73 is sufficiently separated from the side edge of the side flap 70 in this way, a portion that is pressed against the skin when the product is held by hand or during wearing (that is, the side elastic member 73). Since large folds rich in flexibility and cushion are formed on the entire side in the thickness direction of the portion having the leg opening LO, it is particularly preferable to improve the feel of the end portion of the leg opening LO. This effect is particularly remarkable when the side elastic member 73 is sufficiently separated from the side edge of the side flap 70, and the separated portion includes a part or all of the hollow portion 70H.

The positional relationship between the hollow portion 70H and the side elastic member 73 can be appropriately determined, but as shown in the illustrated example, if at least one side elastic member 73 is provided on the front side of the hollow portion 70H, the side is provided. This is preferable because the contraction force of the elastic member 73 is directly applied to the hollow portion 70H, and the shape of the folds in the hollow portion 70H is highly maintainable.

In the non-bonded portion 77, even if the inner sheet layer 76 overlapping the back of the outermost sheet layer 74 or the innermost sheet layer 75 is fixed to the adjacent sheet layer on the opposite side as shown in FIG. Good (the first sheet layer 71 and the second sheet layer 72 of the illustrated example are bonded to each other with a hot melt adhesive HM), but as shown in FIG. 11, the inner sheet layer 76 is a sheet adjacent to both sides in the thickness direction. It is particularly preferable that it is non-fixed to the layer. That is, it is preferable that a plurality of hollow portions 70H partitioned by the inner sheet layer 76 are provided so as to overlap each other in the thickness direction. As a result, folds are independently formed in the portion located between the plurality of hollow portions 70H, and the folds are overlapped with each other so that the folds having better cushioning property are formed on the side portion of the side flap 70. Become.

As shown in the illustrated example, the side flap 70 has a folded sheet layer extending from a portion located on the front side of the hollow portion 70H to a portion located on the back side of the hollow portion 70H by being folded back at the side edge of the side flap 70. It is preferable that the hollow portion 70H extends laterally to the folded position of the folded sheet layer because the cushioning property of the folds formed in the hollow portion 70H is particularly improved by the restoring force against the folding. The folded sheet layer means a pair of layers formed by folding the sheet material.

One preferable example is the structure shown in FIGS. 3, 4, and 11. The side flap 70 has a double folded sheet layer folded back at its side edge, and the outermost sheet layer 74 and the outermost sheet layer 75 of the non-joint portion 77 are located outside, respectively. It is a front side part and a back side part with the folding position of the folded sheet layer as a boundary. Further, the side elastic member 73 is located between the front side portion with the folding position of the folded sheet layer located outside as a boundary and the front side portion with the folding position of the folded sheet layer located inside as a boundary. Is also fixed at a position distant from the center side of the WD in the width direction. Then, between the side elastic member 73 located most laterally and the side edge of the side flap 70, all (four layers) of the sheet layers adjacent to each other in the thickness direction are not joined, so that between the sheet layers. Hollow portions 70H are formed in each of the holes. In this structure, the hollow portion 70H can be formed in three stages (three chambers in the thickness direction) on at least the side portion of the side flap 70. In this case, since each of the double folded sheet layers has a restoring force against the folded, folds having better cushioning property are formed on the side portion of the side flap 70 with less sheet material.

Another preferred example is the structure shown in FIGS. 9, 10 and 12. The side flap 70 has a double folded sheet layer folded back at its side edge, and the first sheet layer 71 and the second sheet layer 72 sandwiching the side elastic member 73 are each folded back located inside. A portion on one side and a portion on the other side are included with the folding position of the sheet layer as a boundary (that is, both the first sheet layer 71 and the second sheet layer 72 are the inner sheet layer 76). Then, in the non-joining portion 77, a portion where the outermost sheet layer 74 and the second sheet layer 72 overlapping the same are not joined, and the outermost sheet layer 75 and the first sheet layer 71 overlapping the same are joined. The hollow portion 70H extends laterally to the folded position of the folded sheet layer located outside. In this structure, the hollow portions 70H are formed on both the front and back sides of the side portion of the side flap 70, and large folds are formed on both the front and back surfaces thereof, so that the side portion of the side flap 70 feels good to the touch. Further, since the side elastic member 73 is doubly covered with the folded sheet layer, the feel of the side elastic member 73 is less likely to be transmitted to the skin, and the touch is particularly good. Further, since the outermost sheet layer 74 and the innermost sheet layer 75 are one side portion and the other side portion with the folding position of the folded sheet layer located on the outside as a boundary, they are hollow due to the restoring force against the folding. The cushioning property of the folds formed in the portion having the portion 70H is also excellent.

Although not shown, the position of the side elastic member 73 in the structures shown in FIGS. 3, 4 and 11 is set between the back side portion and the folded sheet layer located inside with the folded position of the folded sheet layer located outside as a boundary. It may be between the folded position and the back side. That is, the side elastic member 73 may be attached to a portion located on the back side of the hollow portion 70H.

When the non-joint portion 77 has a four-layer structure of a sheet layer as in these examples, it is preferable to construct the side flap 70 by using the sheet of the rising gather 60 as shown in the example of FIG. That is, in the folded sheet layer of the side flap 70 described above, the two-layer structure of the sheet of the rising gather 60 extends from the root portion 65 of the rising gather 60 to the side edge of the side flap 70, and the first portion P1 and the rising gather 60. The two-layer structure of the sheet can be formed by a second portion P2 that is folded back at the side edge of the side flap 70 and extends toward the center of the WD in the width direction.

(Cover non-woven fabric)
In the exterior two-piece type pants type disposable diaper, the interior body 200 is exposed between the front exterior body 12F and the rear exterior body 12B, so that the liquid permeable sheet 11 is not exposed on the back surface of the interior body 200. It is preferable that the back surface of the interior body 200 is provided with a cover non-woven fabric 13 extending between the front exterior body 12F and the interior body 200 and between the rear exterior body 12B and the interior body 200. The inner surface and the outer surface of the cover non-woven fabric 13 can be adhered to the facing surfaces via a hot melt adhesive. As the non-woven fabric used for the cover non-woven fabric 13, for example, the same non-woven fabric as the materials of the

exterior bodies

12F and 12B can be appropriately selected.

(Exterior body)
The

exterior bodies

12F and 12B include a rectangular front exterior body 12F that constitutes at least the waist circumference portion of the front body F, and a rectangular rear exterior body 12B that constitutes at least the waist circumference portion of the rear body B. The front exterior body 12F and the rear exterior body 12B are not continuous on the crotch side, but are separated in the front-rear direction LD (exterior two-divided type). The separation distance 12d in the front-rear direction can be, for example, about 40 to 60% of the total length Y. In the illustrated example, the lower edges of the front exterior body 12F and the rear exterior body 12B are linear along the width direction WD, but at least one lower edge of the front exterior body 12F and the rear exterior body 12B is along the leg circumference. It may be curved like this.

The

exterior bodies

12F and 12B have a waist circumference portion that is a range in the front-rear direction corresponding to the waist circumference region T. Further, in this example, the front-exterior body 12F and the rear-exterior body 12B have the same front-rear dimensions. As shown in FIG. 8, the front-rear direction dimension of the rear exterior body 12B is made longer than the front-rear direction dimension of the front exterior body 12F, and the buttock cover portion extending from the waist circumference region T to the intermediate region L side on the rear exterior body 12B. A structure may be provided in which C is provided and the front exterior body 12F is not provided with a portion corresponding to the intermediate region L. In this case or conversely, although not shown, the front exterior body 12F may also be provided with an inguinal cover portion extending from the waist circumference region T to the intermediate region L side.

As shown in FIGS. 4 and 5, the

exterior bodies

12F and 12B have an inner sheet layer 12H and an outer sheet layer 12S, and elastic members 16 to 19 provided between them. Each sheet layer may be a common sheet material or may be an individual sheet material. That is, in the former case, in a part or all of the front exterior body 12F and the rear exterior body 12B, the inside of one sheet material folded back at appropriate positions such as the edge of the waist opening WO and the edge on the leg opening LO side. Elastic members 16 to 19 can be provided between the portion and the outer portion. In the illustrated example, each waist portion W has a portion including a folded back of the sheet material. For example, in the waist portion W, the sheet material forming the outer sheet layer 12S extends only to the edge of the waist opening WO, but the sheet material forming the inner sheet layer 12H is a sheet forming the second sheet layer. It wraps around the waist side edge of the material and is folded back inside. Further, this folded portion is an interior cover layer 12r extending over the entire width direction of the exterior body to a position overlapping the end portion of the interior body 200 on the waist opening WO side. The interior cover layer 12r may be attached with a dedicated sheet material without folding back the sheet material forming the inner sheet layer 12H.

Elastic members 16 to 19 are built in the waist circumferences of the

exterior bodies

12F and 12B in order to improve the fit to the waist circumference of the wearer, and the waist circumference elastically expands and contracts in the width direction WD with the expansion and contraction of the elastic members. A stretchable region A2 (a region having elastic members 16 to 19) is formed. The waist circumference stretchable region A2 is used as the most leg opening LO side portion when the waist circumference portion (the front-rear direction range having the side seal 12A) in the front exterior body 12F and the rear exterior body 12B is divided into four equal parts in the front-rear direction LD. It is provided so as to include the defined lower end portion 14. Further, the waist circumference expansion / contraction region A2 of the rear exterior body 12B is provided so as to include a portion overlapping the left and right side flaps 70. Similarly, the waist circumference expansion / contraction region A2 of the front exterior body 12F is provided so as to include a portion overlapping the left and right side flaps 70. In the waist circumference stretchable region A2, the

exterior bodies

12F and 12B contract with the contraction of the elastic member in the state of natural length, and wrinkles or folds are formed. It can be stretched to a predetermined stretch rate without wrinkles. As the elastic members 16 to 19, in addition to elongated elastic members such as rubber threads (illustrated examples), known elastic members such as strips, nets, and films can be used without particular limitation. As the elastic members 16 to 19, synthetic rubber such as spandex may be used, or natural rubber may be used.

Explaining the elastic members 16 to 19 of the illustrated example in more detail, a plurality of waist elastic members 17 are spaced in the front-rear direction so as to be continuous over the entire width direction WD in the waist portions W of the

exterior bodies

12F and 12B. It is installed open. Further, among the waist elastic members 17, one or a plurality of members arranged in the region adjacent to the lower waist portion U may overlap with the interior body 200, or may overlap with the interior body 200 in the width direction central portion. May be provided on both sides in the width direction except for. The waist elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, a cross-sectional area of 0.05 to 1.5 mm ² in the case of natural rubber, particularly 0.1 to 1.0 mm). ^It is preferable to provide about 2 to 15 rubber threads, particularly about 4 to 10 at intervals of 2 to 12 mm, particularly at intervals of 3 to 7 mm, and thus the extension of the WD in the width direction of the waist portion W. The rate is preferably about 150 to 400%, particularly 220 to 320%. Further, the waist portion W does not need to use the waist elastic member 17 having the same thickness or the same elongation rate for all of the LDs in the front-rear direction. The thickness and the elongation rate may be different.

Further, it is preferable that a plurality of lower waist

elastic members

16 and 19 made of elongated elastic members are attached to the lower waist portion U of the

exterior bodies

12F and 12B at intervals in the front-rear direction. The

elastic members

16 and 19 below the waist have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, a cross-sectional area of 0.05 to 1.5 mm ² in the case of natural rubber, particularly 0.1 to 1). It is preferable to provide about 5 to 30 rubber threads of 1 to 15 mm (about 0.0 mm ² ) at intervals of 3 to 8 mm, and the elongation rate of the WD in the width direction of the lower waist portion U by this is 200 to 350%. In particular, it is preferably about 240 to 300%.

Further, as shown in FIG. 8, when the buttock cover portion C is provided on the rear exterior body 12B as described above, or when the groin cover portion is provided on the front exterior body 12F (not shown), the elasticity is the same as that of the lower waist portion. A member can be provided, and the elongation rate of the WD in the width direction can be 150 to 300%, particularly 180 to 260%.

When the

elastic members

16 and 19 are provided in the front-rear direction range having the absorber 56 as in the lower waist portion U of the illustrated example, in order to prevent the contraction of the width direction WD of the absorber 56 in a part or all of the

elastic members

16 and 19. In addition, the middle width direction (preferably including the entire inner and outer joints 201 and 202) including a part or all of the portion overlapping the absorber 56 and the WD in the width direction is defined as the non-stretchable region A1, and both sides in the width direction thereof are the trunk. It is preferable that the circumference stretchable region A2 is set. The waist portion W is preferably a waist circumference stretchable region A2 over the entire width direction WD, but a non-stretchable region A1 may be provided in the middle in the width direction as in the waist lower portion U.

Such a waist circumference stretchable region A2 and a non-stretchable region A1 supply elastic members 16 to 19 between the inner sheet layer 12H and the outer sheet layer 12S, and the

elastic members

16 and 19 are moved to the waist circumference stretchable region A2. After fixing only the located portion with the hot melt adhesive, the

elastic members

16 and 19 are cut by pressurization and heating at one place in the middle in the width direction in the region having the absorber 56, or the

elastic members

16 and 19 are cut. It can be constructed by cutting almost the entire portion into small pieces by pressurization and heating, and killing the elasticity in the non-stretchable region A1 while leaving the elasticity in the elastic region A2 around the waist.

The sheet material forming the inner sheet layer 12H and the outer sheet layer 12S can be used without particular limitation, but a non-woven fabric is preferable. When a non-woven fabric is used, the basis weight per sheet is preferably about ^{10 to 30 g / m 2.}

The elastic members 16 to 19 are fixed to the

exterior bodies

12F and 12B by the hot melt adhesive HM by various coating methods. The inner sheet layer 12H and the outer sheet layer 12S are preferably joined by a hot melt adhesive HM for fixing the elastic members 16 to 19 at the portions having the elastic members 16 to 19, respectively, and the elastic members 16 to 19 are joined. In the portion that does not have it, it may be bonded by hot melt adhesive HM, it may be bonded by material welding such as heat seal or ultrasonic seal, or it may not be bonded in part or in whole. In the portions of the

exterior bodies

12F and 12B of the illustrated example having the elastic members 16 to 19, the hot melt adhesive HM is applied only to the outer peripheral surfaces of the elastic members 16 to 19 by a coating means such as a comb gun or a sure wrap nozzle, and the sheet layers are laminated. The elastic members 16 to 19 are fixed to both sheet layers and the layers of both sheets are fixed only by the hot melt adhesive HM applied to the outer peripheral surfaces of the elastic members 16 to 19 by sandwiching the elastic members 16 to 19. The elastic members 16 to 19 may be fixed to both sheet layers only at both ends in the expansion / contraction direction in the waist circumference expansion / contraction region A2.

(Inner and outer joints)
The interior body 200 can be bonded to the

exterior bodies

12F and 12B by means of bonding by material welding such as heat sealing and ultrasonic sealing, or by a hot melt adhesive. As shown in FIG. 2, the inner / outer

joint portions

201 and 202 for joining the inner body 200 and the

outer bodies

12F and 12B can be provided in almost the entire region where the two overlap, for example, both ends in the width direction of the inner body 200. It can also be provided in a portion other than the portion.

In the illustrated example, with respect to the back surface of the interior body 200, that is, in this case, the back surface of the liquid impermeable sheet 11 and the inner surface of the

exterior bodies

12F and 12B via the hot melt adhesive applied to the root portion 65 of the rising gather 60. Is fixed. Further, as shown in FIGS. 13 to 15, the back surfaces of the left and right side flaps 70 are joined to a portion overlapping the rear exterior body 12B via a hot melt adhesive HM. Therefore, the left and right side flaps 70 have a rear joining region 70B joined with a portion including the lower end portion 14 of the rear exterior body 12B.

(Covering of the buttocks)
In this pants-type disposable diaper, the rear joint region 70B of the side flap 70 contracts in the width direction WD together with the waist circumference expansion / contraction region A2 of the rear exterior body 12B in the state of natural length (before mounting). Here, the tensile force when the lower end portion 14 of the front exterior body 12F is extended to the elastic limit in the width direction WD and then contracted to the dimension of 3/4 thereof is the tensile force of the lower end portion 14 of the rear exterior body 12B. When it is larger than the tensile force when it is extended to the elastic limit in the width direction WD and then contracted to the dimension of 3/4, as shown by the arrow in FIG. 17, the lower end portion 14 of the front exterior body 12F is in the mounted state. The lower end portion 14 of the rear exterior body 12B is greatly extended (extended longer) in the width direction WD. As a result, the rear joint region 70B of the side flap 70 expands more widely in the width direction WD, the side flap 70 covers the buttocks more widely, and the interior body 200 is less likely to bite into the intergluteal cleft.

In particular, when the above-mentioned hollow portion 70H is provided up to the post-joining region 70B as shown in the illustrated example, the post-joining region 70B expands greatly in the width direction WD in the mounted state, so that the hollow portion 70H swells later. It becomes nearly flat toward the joint region 70B, and the fit to the buttocks becomes good.

The tensile force when the lower end portion 14 of the front exterior body 12F and the lower end portion 14 of the rear exterior body 12B are respectively extended to the elastic limit in the width direction WD and then contracted to the size of 3/4 thereof is as follows. Measure according to the procedure.
(1) As shown in FIG. 18A, the side seal 12A is peeled off to bring both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B into a separated deployed state, and then the front exterior body is separated. The lower end portion 14 of the front exterior body 12F and the lower end portion 14 of the rear exterior body 12B are cut off, and the absorber 56 is removed as much as possible to form the test piece 14F of the lower end portion 14 of the front exterior body 12F and the lower end portion 14 of the rear exterior body 12B. A test piece 14B is prepared. In the

test pieces

14F and 14B, a portion 200c of the interior body 200 other than the absorber 56 remains.
(2) Measure the width direction dimension (the shortest dimension when the width direction dimension changes in the front-rear direction) between the side seal portions 12A on the natural length test piece 14F (not shown) with a ruler. Further, the test piece 14F at the lower end 14 of the front exterior body 12F is kept in parallel with one side seal 12A and the other side seal 12A, and has an elastic limit in the width direction (the elastic region around the waist is flat without shrinkage or slack). The dimension d2 in the width direction between the side seal portions 12A at the elastic limit is measured with a ruler. Since the latter dimension d2 is the same for the test piece 14F at the lower end 14 of the front exterior body 12F and the test piece 14B at the lower end 14 of the rear exterior body 12B, it is sufficient to measure only one of them.
(3) With the inter-chuck distance Dc less than the dimension in the width direction between the side seal portions 12A of the natural length test piece 14F, one side seal 12A of the test piece 14F at the lower end portion 14 of the front exterior body 12F is placed. The entire front-rear LD is sandwiched by one chuck (grasping tool) C1 of the tensile tester, and the other side seal 12A is sandwiched by the other chuck (grasping tool) C2 of the tensile tester over the entire front-rear LD.
(4) As shown in FIG. 18B, while maintaining one side seal 12A and the other side seal 12A in parallel, the chuck-to-chuck distance Dc becomes d2 (elastic limit) at a tensile speed of 300 mm / min. After extending to, the inter-chuck distance Dc is shortened, and the tensile force when the test piece 14F is contracted until the inter-chuck distance Dc becomes 3/4 of d2 is measured, and this tensile force is used as the front exterior body 12F. It is a measured value of the tensile force when the lower end portion 14 of the above is extended to the elastic limit in the width direction WD and then contracted to the dimension of 3/4 of the extension.
(5) For the test piece 14B at the lower end portion 14 of the rear exterior body 12B, perform (2) to (4) in the same manner as in the case of the front exterior body 12F, and make the lower end portion 14 of the rear exterior body 12B WD in the width direction. The tensile force when the body is stretched to the elastic limit and then contracted to the size of 3/4 of the stretch is measured.
(6) The distance Dc between chucks is measured using a ruler.

In order to create the above-mentioned difference in tensile force, the number, thickness, spacing, material type, arrangement of LDs in the front-rear direction, and maximum elongation rate of the elastic members 16 to 19 in the front exterior body 12F and the rear exterior body 12B. At least one of can be different. For example, most of the general pants-type disposable diapers have the same width WD dimensions of the front exterior body 12F and the width direction WD of the rear exterior body 12B as shown in the illustrated example. When the 12F and the rear exterior body 12B have natural lengths, they are contracted in the width direction WD by the elastic members 16 to 19, and can be extended in the width direction WD by this contraction amount. In such a case, the simplest way is to make the number, thickness, spacing, material type, and arrangement of the LDs in the front-rear direction the same in the front exterior body 12F and the rear exterior body 12B, and the maximum elongation rate. If the front exterior body 12F is made larger than the rear exterior body 12B, the above-mentioned difference in tensile force can be created. The number of elastic members 16 to 19 is increased in the front exterior body 12F than in the rear exterior body 12B, and other conditions are common to the front exterior body 12F and the rear exterior body 12B, and the thickness of the elastic members is set. The front exterior body 12F may be thicker than the rear exterior body 12B, and other conditions may be common to the front exterior body 12F and the rear exterior body 12B.

The difference in tensile force between the lower end portion 14 of the front exterior body 12F and the lower end portion 14 of the rear exterior body 12B may be appropriately determined, but usually, the lower end portion 14 of the front exterior body is set to the elastic limit in the width direction WD. The tensile force when contracted to the 3/4 size after stretching caused the lower end 14 of the rear exterior body to stretch to the elastic limit in the width direction WD and then shrink to the 3/4 size. It is preferably 1.3 to 3.0 times, particularly 1.5 to 2.0 times the tensile force at the time.

The width direction WD dimension (expanded state) of the post-joining region 70B can be appropriately determined, but in order to secure the covering range of the buttocks as wide as possible, the width direction WD dimension (expanded state) of the side flap 70 is 0. It is preferably 8 to 1 times. Further, the dimension (deployed state) of the front-rear LD in the rear-joining region 70B is preferably equal to or larger than the dimension of the front-rear LD in the region where the side flap 70 and the waist-circumferential expansion / contraction region A2 of the rear exterior body 12B overlap. It is preferable that the size is less than the dimension of the front-rear LD in the region where the exterior body 12B and the side flap 70 overlap.

In order to reduce the amount of material used for the

exterior bodies

12F and 12B and to make the structure simple, the front exterior body 12F and the rear exterior body 12B must have the same rectangular shape in the front-rear direction LD and the width direction WD. Is preferable. In such a design, the appropriate front-rear direction LD dimensions of the front exterior body 12F and the rear exterior body 12B are 0.2 to 0.4 times the total length Y of the product. In this case, the covering property of the buttocks is lowered only by the rear exterior body 12B, but the covering property of the buttocks can be supplemented by the side flap 70 of the interior body 200 described above.

As in the case of the rear exterior body 12B, as shown in FIG. 16, the back surfaces of the left and right side flaps 70 are joined to the portion overlapping the front exterior body 12F via the hot melt adhesive HM, and the left and right sides are joined. It is preferable that the flap 70 has a pre-bonding region 70F joined to a portion including the lower end portion 14 of the front exterior body 12F. In this case, the front joint region 70F of the side flap 70 contracts in the width direction WD together with the waist circumference expansion / contraction region A2 of the front exterior body 12F in the state of natural length (before mounting). Here, as described above, the tensile force when the lower end portion 14 of the front exterior body is extended to the elastic limit in the width direction WD and then contracted to the dimension of 3/4 thereof is the lower end portion of the rear exterior body. If it is larger than the tensile force when 14 is extended to the elastic limit in the width direction WD and then contracted to the size of 3/4 of the elastic limit, the rear exterior body 12B is larger than the lower end portion 14 of the front exterior body 12F in the mounted state. The lower end portion 14 of the is largely extended in the width direction WD (extended longer). As a result, as shown in FIG. 17, although the pre-joining region 70F of the side flap 70 expands in the width direction WD, it does not expand more than the post-joining region 70B, so that the pre-joining region 70F and the post-joining region 70B expand to the same extent. The side flaps 70 will fit more appropriately to the groin as compared to the case of doing so.

In particular, when the above-mentioned hollow portion 70H is provided up to the front joining region 70F as shown in the illustrated example, the rear joining region 70B expands more in the width direction WD than the front joining region 70F in the mounted state, so that the side flap 70 The width of the hollow portion 70H becomes narrower from the rear to the front, the bulge of the hollow portion 70H becomes larger from the back to the front, and the fit to the inguinal region is also improved.

The size of the width direction WD of the front joining area 70F is preferably the same as the size of the width direction WD of the back joining area 70B, but it may be shorter or longer. Further, the dimension (deployed state) of the front-rear direction LD of the front joining region 70F is preferably equal to or larger than the dimension of the front-rear direction LD of the region where the side flap 70 and the waist circumference expansion / contraction region A2 of the front exterior body 12F overlap. It is preferable that the size is less than the dimension of the front-rear LD in the region where the exterior body 12F and the side flap 70 overlap.

(Non-woven fabric)
As the non-woven fabric in the above description, a known non-woven fabric can be appropriately used depending on the site and purpose. Examples of the constituent fibers of the non-woven fabric include olefin-based fibers such as polyethylene and polypropylene, polyester-based and polyamide-based synthetic fibers (including single-component fibers and composite fibers such as core sheaths), as well as recycled rayon and cupra. Fibers, natural fibers such as cotton, and the like can be selected without particular limitation, and these can be mixed and used. In order to increase the flexibility of the non-woven fabric, it is preferable that the constituent fibers are crimped fibers. Further, the constituent fibers of the non-woven fabric include hydrophobic fibers or water-repellent fibers (including fibers made water-repellent by the water-repellent agent) even if they are hydrophilic fibers (including fibers made hydrophilic by the hydrophilic agent). ) May be. In addition, the non-woven fabric generally has a short fiber non-woven fabric, a long fiber non-woven fabric, a spunbond non-woven fabric, a melt blown non-woven fabric, a spunlace non-woven fabric, a thermal bond (air-through) non-woven fabric, and a needle punch depending on the fiber length, the sheet forming method, the fiber bonding method, and the laminated structure. It is classified into non-woven fabrics, point-bonded non-woven fabrics, laminated non-woven fabrics (SMS non-woven fabrics having a melt blown layer sandwiched between spunbond layers, SMMS non-woven fabrics, etc.), and any of these non-woven fabrics can be used.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

-The "front-back direction" means the direction indicated by the symbol LD in the figure (vertical direction), and the "width direction" means the direction indicated by the WD in the figure (horizontal direction), and the front-back direction and the width direction. Are orthogonal.

・ "Front side" means the person closer to the wearer's skin when wearing a pants-type disposable diaper, and "back side" means the person farther from the wearer's skin when wearing a pants-type disposable diaper. ..

・ "Front side" means the side of the member that is closer to the wearer's skin when wearing a pants-type disposable diaper, and "back side" means the side of the member that is closer to the wearer's skin when wearing a pants-type disposable diaper. It means the far side.

・ "Elongation rate" means the value when the natural length is 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.

・ "Maximum elongation rate" means the elongation rate when stretched to the elastic limit (in other words, the stretch rate in the expanded state in which the stretchable region is flatly expanded without shrinkage or slack).

・ "Gel strength" is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97.09 wt% To 49.0 g of the mixture), 1.0 g of a highly absorbent polymer is added, and the mixture is stirred with a stirrer. The produced gel is left in a constant temperature and humidity chamber at 40 ° C. × 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500 manufactured by I.techno Engineering).

・ "Metsuke" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to bring it to a constant weight. Pre-drying refers to making a sample or test piece constant in an environment at a temperature of 100 ° C. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. A sample having a size of 100 mm × 100 mm is cut out from the test piece in a constant weight state using a sampling template (100 mm × 100 mm). The weight of the sample is measured and multiplied by 100 to calculate the weight per square meter, which is used as the basis weight.

-The "thickness" is automatically measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) under the conditions of ^{a load of 0.098 N / cm 2} and a pressurized area of 2 cm ^2.

-The water absorption amount is measured by JIS K7223-1996 "Water absorption amount test method for highly water-absorbent resin".

-The water absorption rate shall be the "time to the end point" when JIS K7224-1996 "Water absorption rate test method for highly water-absorbent resin" was performed using 2 g of highly absorbent polymer and 50 g of physiological saline. ..

・ "Unfolded state" means a state in which it is unfolded flat without shrinkage or slack.

・ Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

-If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). To do.

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

11 ... Liquid permeable sheet, 12A ... Side seal, 12B ... Rear exterior body, 12E ... Waist extension part, 12F ... Front exterior body, 12F, 12B ... Exterior body, 12H ... Inner sheet layer, 12S ... Outer sheet layer , 13 ... Cover non-woven fabric, 14 ... Lower end, 15, 19 ... Waist lower elastic member, 17 ... Waist elastic member, 200 ... Interior body, 201, 202 ... Inner / outer joint, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbent element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Rise gather, 60A ... Tip side part, 60B ... Root side part, 62 ... Gather sheet, 63 ... Gather elastic member, 67 ... Folded part, 68 ... Rise Part, 70 ... side flap, 71 ... first sheet layer, 72 ... second sheet layer, 73 ... side elastic member, 74 ... most front side sheet layer, 75 ... most back side sheet layer, 76 ... inner sheet layer, 77 ... non-joint part, 79 ... dedicated sheet material, A1 ... non-stretchable area, A2 ... stretchable area, F ... front body, B ... back body, L ... intermediate area, LD ... front-back direction, SG ... side stretchable area, T ... Waist circumference area, U ... lower waist, W ... waist, WD ... width direction, WO ... waist opening, LO ... leg opening, P1 ... first part, P2 ... second part, HM ... hot melt adhesive, 70B ... Post-bonding area, 70F ... Front-bonding area, 70H ... Hollow part, 14F, 14B ... Test piece.

Claims

The front exterior body that constitutes at least the waist circumference of the front body, and the rear exterior body that constitutes at least the waist circumference of the back body,
An interior body including an absorber provided from the front exterior body to the rear exterior body, and
An inner / outer joint portion to which the interior body, the front exterior body, and the rear exterior body are joined, respectively.
A side seal in which both side portions of the front exterior body and both side portions of the rear exterior body are joined, respectively.
With a waist opening and a pair of left and right leg openings
The front exterior body and the rear exterior body elastically expand and contract in the width direction including the lower end portion defined as the most leg opening side portion when the front-rear direction range having the side seal is divided into four equal parts in the front-rear direction. It has a stretchable area around the waist and
On both sides of the interior body, side flaps extending laterally from the absorber extend in the front-rear direction from the front exterior body to the rear exterior body.
The side flap has a side elastic region that elastically expands and contracts in the front-rear direction at least in a portion between a portion that overlaps the front exterior body and a portion that overlaps the rear exterior body.
The elastic region around the waist of the rear exterior body is provided at least in a portion overlapping the left and right side flaps.
The left and right side flaps have a post-joining region joined with a portion including the lower end of the rear exterior body.
The post-joining region is contracted in the width direction and is expandable in the width direction together with the elastic region around the waist of the rear exterior body.
The tensile force when the lower end of the front exterior body is extended to the elastic limit in the width direction and then contracted to the dimension of 3/4 of the extension causes the lower end of the rear exterior body to reach the elastic limit in the width direction. It is larger than the tensile force when it is stretched and then shrunk to its 3/4 size.
Pants-type disposable diapers that feature this.
The tensile force when the lower end of the front exterior body is extended to the elastic limit in the width direction and then contracted to the dimension of 3/4 of the extension causes the lower end of the rear exterior body to reach the elastic limit in the width direction. It is 1.3 to 3.0 times the tensile force when it is stretched and then shrunk to its 3/4 size.
The pants-type disposable diaper according to claim 1.
The widthwise dimension of the post-joining region is 0.8 to 1 times the widthwise dimension of the side flaps.
The pants-type disposable diaper according to claim 1 or 2.
The front exterior body and the rear exterior body are rectangular in which the dimensions in the front-rear direction and the dimensions in the width direction are the same.
The dimensions of the front exterior body and the rear exterior body in the front-rear direction are 0.2 to 0.4 times the total length of the product.
The pants-type disposable diaper according to any one of claims 1 to 3.
The elastic region around the waist of the front exterior body is provided at least in a portion overlapping the left and right side flaps.
The left and right side flaps have a front joining region joined to a portion including the lower end of the front exterior body.
The front joint region is contracted in the width direction and is expandable in the width direction together with the elastic region around the waist of the front exterior body.
The pants-type disposable diaper according to any one of claims 1 to 4.
The side expansion / contraction region is a region in which one or a plurality of elongated side elastic members are provided on the side flap along the front-rear direction and at intervals from each other.
The side flap has a hollow portion extending in the front-rear direction from the front joining region to the back joining region along its side edge.
Due to the contraction of the side elastic member, the portion of the side flap including the hollow portion contracts in the front-rear direction to form side gathers.
The pants-type disposable diaper according to any one of claims 1 to 5.