JP2019054939A5 - - Google Patents

Description

Pants type disposable diapers

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

A general pants-type disposable diaper has an integrated outer body extending from the front body to the back body, or an outer body separately provided on the front body and the back body, and the width of the outer body so as to cover both front and rear sides of the crotch part. An interior body with an absorber attached to the middle part of the direction, side seals where both sides of the exterior body on the front body and both sides of the exterior body on the back body are joined, a waist opening and a pair of left and right sides. It is equipped with a leg opening.

In such pants-type disposable diapers, in order to prevent leakage from the gap between the back body and the wearer's back (hereinafter referred to as back leakage), the rear end of the absorption chassis is folded back in a bellows shape on the front side. It has been proposed to provide a back leakage prevention pocket at the rear end of the absorption chassis by attaching it to the outer surface of the waist panel (see, for example, Patent Document 1).

However, in the case described in Patent Document 1, it is necessary to fold the rear end portion of the absorption chassis in a bellows shape, and not only the structure is complicated, but also the flow direction in the production line of the absorption chassis is generally in the front-rear direction. Considering that, it is not easy to manufacture. Further, in the case described in Patent Document 1, since the absorption chassis is attached to the outer surface of the rear waist panel, the absorption chassis may unnecessarily swell and the wearing feeling may be deteriorated.

Japanese Unexamined Patent Publication No. 2016-67760

Therefore, a main object of the present invention is excellent in simple and manufacturability, lies in such to provide a pants-type disposable diaper having a leakproof pocket.

Typical aspects of pants-type disposable diapers that solve the above problems are as follows.
<First aspect>
An integrated exterior body from the front body to the back body, or an exterior body separately provided on the front body and the back body, and an absorber attached to the exterior body so as to pass from the front body to the crotch and extend to the back body. Pants-type disposable diaper with side seals, waist openings and a pair of left and right leg openings, which are joined to the interior including the interior, both sides of the exterior on the front and both sides of the exterior on the back. In
At least one exterior body of the front body and the back body has a first exterior portion extending to the edge of the waist opening and a second exterior portion folded inward at the edge of the waist opening.
The interior body includes a first interior portion extending along the first exterior portion to the edge of the waist opening, and a second interior portion folded inward at the edge of the waist opening along the second exterior portion. And have
The second interior portion is non-fixed or detachably fixed to the first interior portion, and the portion of the second exterior portion outside in the width direction from both side edges of the second interior portion is the first exterior portion. It is fixed to the part and
The space between the first interior portion and the second interior portion is a storage space, and a pocket having an entrance on the crotch side.
Pants-type disposable diapers that feature this.

(Action effect)
In this embodiment, after the unfolded interior body having the first interior portion and the second interior portion is attached to the unfolded exterior body having the first exterior portion and the second exterior portion, the second exterior portion and the second exterior portion The second interior part is folded inward, the second interior part is fixed to the first interior part non-fixed or detachably fixed, and the part of the second exterior part outside the width direction from both side edges of the second interior part is By simply fixing to the first exterior portion, pockets can be formed at at least one end on the front and rear sides of the interior body. That is, it can be manufactured only by combining the extension of the interior body and the exterior body in the front-rear direction and the folding and fixing, and the structure is also simplified.

<Second aspect>
On both sides of the interior body, rising gathers having a rising portion capable of rising on the accommodation space side are continuous over the first interior portion and the second interior portion.
The tip of the rising gather in the first interior portion and the tip of the rising gather in the second interior portion are joined to each other.
Both side surfaces of the pocket are formed by the rising gathers of the first interior portion and the rising gathers of the second interior portion.
The pants-type disposable diaper of the first aspect.

(Action effect)
Many pants-type disposable diapers have wake-up gathers on both sides of the interior. In this embodiment, this is used to extend to the second interior portion, and the tip portions of the upper and lower rising gathers facing each other are joined. In this case, since both sides of the pocket have a bellows shape (in other words, with a so-called gusset), there is an advantage that the entrance and the accommodation space of the pocket become larger.

<Third aspect>
The rising portion of the first interior portion in the rising gather is contracted in the front-rear direction by a gather elastic member attached to the tip portion thereof, so that the rising state is maintained.
The rising portion of the first interior portion in the rising gather extends at least to the middle in the front-rear direction of the second interior portion.
The pants type disposable diaper of the second aspect.

(Action effect)
The rising portion of the general rising gather is maintained in the rising state by contracting in the front-rear direction by the gather elastic member attached to the tip portion. In this aspect, utilizing this, the raised portion of the raised gather of the first interior portion is extended to at least the middle in the front-rear direction of the second interior portion. In this case, the second interior portion can be lifted by the rising force of the rising portion in the rising gather of the first interior portion, and the entrance of the pocket can be opened.

<Fourth aspect>
A waist elastic member that is continuous along the width direction is attached to the waist.
The waist elastic member is
In the area built in the second exterior portion or having the pocket, it passes between the second exterior portion and the second interior portion, and on both sides of the pocket, the second exterior portion and the first exterior portion. Passing between the parts,
A pants-type disposable diaper according to any one of the first to third aspects.

(Action effect)
The waist of many pants-type disposable diapers is fitted with a waist elastic member that is continuous along the width direction. In this embodiment, the elastic member of the waist portion is used to ensure that the inner surface of the waist portion, that is, the inner surface of the second exterior portion is in close contact with the body surface, and the second interior portion integrated with the second exterior portion is lifted to form a pocket. The entrance can be left open.

<Fifth aspect>
The interior body has a liquid-impermeable sheet that covers the back side of the absorber in the first interior portion.
The liquid-impermeable sheet is continuous from the first interior portion to the second interior portion.
A pants-type disposable diaper according to any one of the first to fourth aspects.

(Action effect)
The interior of many pants-type disposable diapers has a liquid-impermeable sheet that covers the back of the absorber. Therefore, by utilizing this and making the liquid permeable sheet continuous from the first interior portion to the second interior portion, the waterproof property of the pocket is improved.

<Sixth aspect>
The absorber is provided in the first interior portion and the second interior portion.
A pants-type disposable diaper according to any one of the first to fifth aspects.

(Action effect)
By providing the absorbers in the first interior portion and the second interior portion in this way, the liquid content of the excrement contained in the pocket is absorbed on both sides (not only from the first interior portion side but also from the second interior portion side). Can also be absorbed), improving leak prevention.

The above-mentioned pants-type disposable diaper has advantages such as being simple and easy to manufacture, and being a pants-type disposable diaper having a back leakage prevention pocket.

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 3-3 sectional view of FIG. It is a cross-sectional view of 4-4 of FIG. It is a cross-sectional view of 5-5 of FIG. It is a perspective view of a pants type disposable diaper. It is a 6-6 sectional view of FIG. It is a top view which shows the manufacturing process. It is a top view which shows (a) the state before folding and (b) the state after folding. It is a cross-sectional view corresponding to the 4-4 cross section of FIG. It is a cross-sectional view corresponding to the 6-6 cross section of FIG. It is a cross-sectional view corresponding to the 4-4 cross section of FIG. It is a cross-sectional view corresponding to the 4-4 cross section of FIG. It is a cross-sectional view corresponding to 2-2 cross section of FIG. It is a cross-sectional view corresponding to the 3-3 cross section of FIG. It is a top view which shows the outer surface of the pants type disposable diaper in the unfolded state. It is 4-4 sectional view of FIG.

Hereinafter, some examples of pants-type disposable diapers will be described 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. The fixed part of the elastic member is formed by (transfer of hot melt adhesive by the letterpress method) or 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 the joining means for joining the constituent members, a means by welding materials such as a heat seal and an ultrasonic seal can also be used.

1 to 8 show an example of a pants-type disposable diaper. This pants-type disposable diaper includes a 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 portion from the front exterior body 12F. It is provided with an interior body 200 attached to the exterior bodies 12F and 12B so as to extend to the rear exterior body 12B through the above. Further, both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form the side seal portion 12A. As a result, the openings formed by the front and rear ends of the exterior bodies 12F and 12B become waist openings WO through which the wearer's torso passes, and the lower edges of the exterior bodies 12F and 12B and the interior body 200 on both sides in the width direction of the interior body 200. The portion surrounded by the side edges is the leg opening 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 back body B), and the reference numeral X indicates the diaper in the unfolded state. Shows the full width of.

The pants-type disposable diaper of the illustrated example has a waist circumference region T defined as a front-rear direction range (a front-back direction range from the waist opening WO to the upper end of the leg opening LO) having a side seal portion 12A, and a portion forming the leg opening LO. It has an intermediate region L defined as a front-rear direction range (between a front-rear direction region having a side seal portion 12A of the front body F and a front-rear direction region having a side seal portion 12A of the back body B). The waist circumference region T can be divided into a "waist portion" W that conceptually forms an end portion of the waist 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 portion W is a portion extending toward the waist opening WO side of the absorber 56 or the interior body 200. 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.

(pocket)
Characteristically, as shown in FIGS. 5, 7 and 8, the posterior exterior body 12B (rear body exterior body) has a first exterior portion 71 extending to the edge of the waist opening WO and a waist opening WO. It has a second exterior portion 72 that is folded inward at the edge of the. Further, the interior body 200 is folded inward at the first interior portion 81 extending along the first exterior portion 71 to the edge of the waist opening WO and the edge of the waist opening WO along the second exterior portion 72. It has a second interior portion 82. The second interior portion 82 is not fixed to the first interior portion 81 (or may be detachably fixed), and is in the width direction of the second exterior portion 72 with respect to both side edges of the second interior portion 82. The outer portion 82b of the WD is fixed to the first exterior portion 71 with a hot melt adhesive or the like. As a result, as shown in FIGS. 8 and 12, a pocket 90 is formed in which the space between the first interior portion 81 and the second interior portion 82 serves as a storage space and has an entrance on the crotch side.

As shown in FIGS. 9 and 10, such a pocket 90 has a first interior portion 81 and a second interior portion 82 with respect to the unfolded exterior body having the first exterior portion 71 and the second exterior portion 72. After attaching the unfolded interior body 200 having the above, the second exterior portion 72 and the second interior portion 82 are folded back inward, and the second interior portion 82 is not fixed to the first interior portion 81 (or is detachably fixed). However, it can be formed only by fixing the portion 82b of the second exterior portion 72 outside the WD in the width direction from both side edges of the second interior portion 82 to the first exterior portion 71. That is, it can be manufactured only by extending the interior body 200 and the rear exterior body 12B in the front-rear direction LD and folding and fixing, and the structure is also simplified.

The front-rear direction dimension of the second exterior portion 72 and the front-rear direction LD dimension of the second interior portion 82 can be appropriately determined. In a normal case, the front-rear direction dimension 72y of the second exterior portion 72 can be 0.05 to 0.2 times the total length Y of the diaper. Further, the front-rear direction dimension 82y of the second interior portion 82 can be 1.0 to 2.5 times the front-rear direction dimension 72y of the second exterior portion 72.

The second exterior portion 72 and the second interior portion 82 may not be joined, but at least the crotch side end of the overlapping region of the second exterior portion 72 and the second interior portion 82 is a hot melt adhesive. It is preferable that the whole is fixed by such as, and the whole can be fixed, but when the whole is fixed, it is preferable to fix the whole intermittently.

Of the second exterior portion 72, the portion 82b outside the width direction from both side edges of the second interior portion 82 may be fixed as a whole, but only a part is fixed because the posterior exterior body 12B becomes hard. For example, it is preferable that the end portion on the crotch side is continuously or intermittently fixed over the entire width direction WD as shown in the illustrated example.

The first interior portion 81 and the second interior portion 82 may be non-fixed over substantially the entire area, but as shown in FIG. 10, the portion located at the waist portion W is hot at the fixed portion 82c over the entire width direction. When fixed with a melt adhesive or the like, the second exterior portion 72 does not bulge outward at the waist portion W, the appearance and fit are less likely to deteriorate, and the inverted portion 67 of the rising gather, which will be described later, is reliably formed. Therefore, it is preferable. In this case, as shown in FIG. 10, in the waist portion W, the width direction of the rear exterior body 12B including not only the first interior portion 81 and the second interior portion 82 but also the first exterior portion and the second exterior portion. It is also preferable to provide the fixing portion 82c continuously or intermittently in the width direction over the entire WD.

The opposing portions of both side portions of the second interior portion 82 and both side portions of the first interior portion 81 are preferably joined over the entire front-rear LD, but may not be joined. For example, as shown in the illustrated example, when a rising gather 60 having a rising portion 68 capable of rising is provided on both sides of the second interior portion 82 and both sides of the first interior portion 81 on the accommodation space side. As shown in 8 and FIG. 10, the facing portion 60c at the tip of the rising gather 60 can be joined (described later).

The second interior portion 82 may be formed by folding back any member of the interior body 200, or all the members may be folded back, but usually, only a part of the members are continuous. It is preferable, for example, as in the example shown in FIG. 5, members other than the intermediate sheet 40 and the absorbing element (top sheet 30, liquid permeable sheet 11 and cover non-woven fabric 13) described later are continuously connected from the first interior portion 81. It is preferable to have it. In particular, from the viewpoint of leakage prevention, it is preferable that at least the liquid-impermeable sheet 11, which will be described later, is folded back from the first interior portion 81 and continues to the second interior portion 82. Further, since the surface of the pocket 90 in contact with the skin is important to be touched and breathable, the non-woven fabric such as the rear exterior body is folded back from the first interior portion 81 as shown in the illustrated example, and the inner surface of the second interior portion 82 is folded back. It is preferable that it is continuous up to.

Further, as shown in the example shown in FIG. 11, it is also preferable that the first interior portion 81 and the second interior portion 82 are provided with the absorber 56, respectively. In this way, by making the absorber 56 continuous from the first interior portion 81 to the second interior portion 82, the liquid content of the excrement that has entered the pocket 90 is absorbed on both sides (not only on the first interior portion 81 side, but also on the first interior portion 81 side). It can also be absorbed from the second interior portion 82 side), improving leakage prevention. Even if the absorber 56 is individually provided in the first interior portion 81 and the second interior portion 82, or as shown in the illustrated example, the absorber 56 is folded back from the first interior portion 81 and the second interior portion 82 is provided. It may be continuous up to. In the latter case, although not shown, processing (embossing or the like) for facilitating the bending of the absorber 56 may be performed at the folded position.

The second exterior portion 72 may be formed by folding back any of the sheet materials constituting the rear exterior body 12B, and the sheet material forming the outer sheet layer 12S as in the example shown in FIG. In addition to being formed by, it may be formed by a sheet material forming the inner sheet layer 12H together with or in place of the sheet material.

In the example shown in FIG. 5 and the like, only the rear exterior body 12B (rear body exterior body) is provided with the first exterior portion 71, the second exterior portion 72, the first interior portion 81, and the second interior portion 82, and pockets are provided. 90 is formed, and together with (or instead of this), the first exterior portion 71 and the second exterior portion 72 are formed on the front exterior body 12F (the exterior body of the front body) as shown in the example shown in FIG. , The first interior portion 81 and the second interior portion 82 may be provided to form the pocket 90.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 absorbs the absorber 56, the liquid-permeable top sheet 30 covering the front side of the absorber 56 in the first interior portion 81, and the first interior portion 81. It has a liquid-impermeable sheet 11 that covers the back side of the body 56. Reference numeral 58 indicates a packaging sheet for wrapping the absorber 56, and the absorption element 50 is formed by wrapping the absorber 56 with the packaging sheet 58. Reference numeral 40 indicates an intermediate sheet (second sheet) provided between the top sheet 30 and the absorber 56 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorber 56 side. Reference numeral 60 indicates rising gathers 60 rising from both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

(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. In addition, the non-woven fabric is not particularly limited as to what the raw material fiber is. For example, olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester-based and polyamide-based fibers, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers in which two or more of these are used. Etc. can be exemplified. Further, the non-woven fabric may be produced by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable, and if bulkiness and softness are required, the air through method, point bond method, and thermal bond method are preferable processing methods. ..

Further, the top sheet 30 may be one made of one sheet or one 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 toward the liquid-impermeable sheet 11 at 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 is 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 the position shift of the member on the absorber 56 side. It is desirable to do. In the illustrated example, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the portion 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 to enhance the absorption performance by the absorber and prevent the phenomenon of "reversion" of the absorbed liquid from the absorber. The intermediate sheet 40 may be omitted.

Examples of the intermediate sheet 40 include the same material 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, 25~60g / m} 2 is more preferable. 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 of 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 having a plastic film on the surface of the non-woven fabric, or a plastic film. An example can be exemplified of a laminated sheet in which a non-woven fabric or the like is laminated and joined. 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, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition to this, non-woven fabrics using microdenyl fibers, leakage-proof strengthening by reducing the voids of the fibers by applying heat or pressure, coating of superabsorbent polymer or hydrophobic resin or water repellent, etc. Therefore, a liquid-impermeable sheet without using a plastic film can also be used as the liquid-impermeable sheet 11.

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.

Further, an excretion indicator whose color changes due to absorption of the liquid can be provided inside the liquid impermeable sheet 11, particularly on the side surface of the absorber 56.

(Get up gather)
The rising gather 60 extends along both side portions of the interior body 200 over the entire front-rear direction LD and is provided to prevent lateral leakage, and includes what is generally called a three-dimensional gather. ..

The rising gather 60 shown in FIGS. 1, 3 and 4 has a rising portion 68 rising from the side portion of the interior body 200. In the rising portion 68 of the rising gather 60, the root side portion 60B rises diagonally toward the center side in the width direction, and the tip side portion 60A rises diagonally toward the outside in the width direction from the middle portion. It is not limited to the above, and it is possible to make appropriate changes such as those that rise to the center side in the width direction as a whole.

More specifically, the rising gather 60 of the illustrated example is a strip-shaped gathered non-woven fabric 62 having a length equal to the length in the front-rear direction of the interior body 200, 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 along the longitudinal direction are fixed between the folded portion and the sheets in the vicinity thereof in an extended state at intervals in the width direction WD. The base end portion (the end portion opposite to the sheet folded portion in the width direction WD) located on the opposite side of the rising gather 60 from the tip portion is the back side (top sheet 30 side) of the liquid impermeable sheet 11 in the interior body 200. The root portion 65 is fixed to the side portion (on the opposite side), and the portion other than the root portion 65 is the main body portion 66 (the 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. This form is a surface contact type rising gather 60, but a line contact type rising gather 60 that does not fold outward in the width direction can also be adopted.

Then, in the first interior portion 81, both ends of the main body portion 66 in the front-rear direction are set as the downturned portions 67 fixed to the side portions of the top sheet 30 in the downturned state, while the front and rear portions located between them. The middle portion in the direction is a non-fixed rising portion 68, and a gather elastic member 63 along the front-rear direction LD is fixed to at least the tip portion of the rising portion 68 in an extended state.

As a result, in the first interior portion 81, the contraction force of the gather elastic member 63 acts to bring both ends in the front-rear direction closer to each other, but both ends in the front-rear direction of the main body portion 66 are fixed so as not to rise. On the other hand, since there is a non-fixed rising portion 68 between them, only the rising portion 68 rises so as to abut on the body side as shown by an arrow in FIG. In particular, when the root portion 65 is located on the back side of the interior body 200, the rising portion 68 stands up so as to open outward in the width direction in the crotch portion and its vicinity, so that the rising gather 60 abuts on the surface around the legs. And the fit will be improved.

As shown in the illustrated example, when the lifted portion is maintained in the raised state by the gather elastic member 63, the lifted portion of the first interior portion 81 in the raised gather 60 extends at least to the middle of the LD in the front-rear direction of the second interior portion 82. This is preferable because the second interior portion 82 can be lifted by the rising force of the rising portion in the rising gather 60 of the first interior portion 81 to open the entrance of the pocket 90.

The rising gather 60 may be provided only on the first interior portion 81, but it is preferable that the rising gather 60 is continuously provided to the second interior portion 82 through the folded position as shown in the illustrated example because the interior body 200 can be easily manufactured. In this case, the gathered elastic member 63 may or may not be provided in the raised portion 68 of the second interior portion 82.

Further, when continuous rising gathers 60 are provided over both side portions of the second interior portion 82 and both side portions of the first interior portion 81, the tip portion of the rising gather 60 in the first interior portion 81 and the second interior portion The tip of the rising gather 60 in 82 is joined by the facing portion 60c, and both side surfaces of the pocket 90 are formed by the rising gather 60 of the first interior portion 81 and the rising gather 60 of the second interior portion 82. Is preferable. In this case, since both side surfaces of the pocket 90 have a bellows shape (in other words, with a so-called gusset), there is an advantage that the entrance and the accommodation space of the pocket 90 become larger.

In the raised gather 60 of the illustrated example, in the bent form, the main body portion 66 is composed of 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 inverted portion 67, the tip side portion 60A and the root side portion 60B are joined in an inverted state, and the root side portion 60B is joined to the top sheet 30 in an inverted 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 one preferable form 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 gathered non-woven fabric 62, a flexible non-woven fabric having excellent uniformity and concealing properties such as spunbonded non-woven fabric (SS, SSS, etc.), SMS non-woven fabric (SMS, SMSMS, etc.), melt-blown non-woven fabric, etc., and water-repellent with silicone or the like, if necessary. The treated material can be preferably used, and the fiber texture is preferably about 10 to 30 g / m ² . As the gather elastic member 63, rubber thread or the like can be used. When spandex rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixing is preferably 150 to 350%, more preferably 200 to 300%. The term "elongation rate" means a value when the natural length is 100%. Further, as shown in the drawing, the waterproof film 64 can be interposed between the gathered nonwoven fabrics 62 folded in two. In this case, the gathered nonwoven fabric 62 is partially omitted in the existing portion of the waterproof film 64. However, in order to make the appearance and feel of the product like a cloth, it is necessary that at least the outer surface from the base end to the tip of the rising gather 60 is formed of the gathered non-woven fabric 62 as shown in the illustrated example. is there.

The number of gather elastic members 63 provided in the rising portion 68 of the rising gather 60 is preferably 2 to 6, and more preferably 3 to 5. The arrangement interval 60d is preferably 3 to 10 mm. With this configuration, the gathered elastic member 63 can easily hit the skin in the area where it 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, heat seal, and ultrasonic waves are used for bonding the inner layer and the outer layer of the gathered non-woven fabric 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 gathered nonwoven fabric 62 are bonded together, the flexibility is impaired. Therefore, it is preferable that the parts other than the bonded portion of the gathered elastic member 63 are not bonded or are weakly bonded. In the illustrated example, a hot melt adhesive is applied 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, and the gather elastic member 63 is sandwiched between the inner layer and the outer interlayer of the gathered nonwoven fabric 62. The structure is such that the gather elastic member 63 is fixed to the inner layer and the outer layer of the gathered nonwoven fabric 62 and the inner layer and the outer layer of the gathered nonwoven fabric 62 are fixed only by the hot melt adhesive applied to the outer peripheral surface of the gathered nonwoven fabric 62. There is.

Similarly, for fixing the waterproof film 64 incorporated in the rising gather 60 and the gathered non-woven fabric 62, and fixing the inverted portion 67, hot melt adhesives are used by various coating methods, and materials such as heat seals and ultrasonic seals are welded. At least one of the means by means can be used.

The dimensions of the rising gather 60 in the illustrated example can be appropriately determined, but in the case of baby diapers, for example, as shown in FIG. 3, the rising height of the rising gather 60 (the length in the width direction of the main body portion 66 in the unfolded state). ) W2 is preferably 15 to 60 mm, particularly preferably 20 to 40 mm. Further, the separation distance W1 between the innermost folds when the rising gather 60 is folded flat so as to be parallel to the surface of the top sheet 30 is preferably 60 to 190 mm, particularly 70 to 140 mm.

On the other hand, as shown in FIGS. 15 and 16, the rising gather and the so-called plane gather can be integrally provided. That is, in the illustrated example, the first portion 61 (planar gathered portion) protruding sideways from the interior body 200 from the root portion 65 fixed to the side portion on the back side of the liquid permeable sheet 11 in the interior body 200. The interior body 200 has a second portion 69 (raising gather) that protrudes toward the top sheet 30 from the root portions 65 fixed to both sides of the top sheet 30. More specifically, the strip-shaped gathered nonwoven fabric 62 having a length equal to the length in the front-rear direction of the interior body 200 extends laterally from the root portion 65 and is folded back toward the top sheet 30 at the tip of the first portion 61. The portion folded back toward the top sheet 30 reaches the second portion 69 via the first portion 61, and is folded back at the tip of the second portion 69. The overlapping portions of the gathered nonwoven fabric 62 are joined by a hot melt adhesive or the like at the facing portions. Further, both ends of the second portion 69 in the front-rear direction are formed as an inverted portion 67 fixed to the side surface of the top sheet 30 in the inverted state, while the intermediate portion in the front-rear direction located between them is It is a non-fixed rising portion 68. At least in the middle portion in the front-rear direction of the first portion 61, and in the rising portion 68 of the second portion 69, one gather elastic member 63 along the front-rear direction LD or a plurality of gathered elastic members 63 at intervals in the width direction WD is extended. Due to the contraction force, the rising portion 68 of the second portion 69 contracts in the front-rear direction LD to form a three-dimensional gather that contacts the circumference of the leg, and the first portion 61 contracts in the front-rear direction LD and the leg. It becomes a flat gather that touches the surroundings.

The second portion 69 stands up on the central side in the width direction as a whole, but is not limited to this, and is in a bent form as in the rising gather 60 shown in FIG. , Can be changed as appropriate. Other points, for example, the material of the gathered nonwoven fabric 62, the material of the gathered elastic member 63, and the like are the same as those of the raised gather 60 shown in FIG. 3, and thus the description thereof will be omitted.

(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 a filament aggregate obtained by stacking short fibers such as cotton-like pulp and synthetic fibers, and opening tow (fiber bundle) of synthetic fibers such as cellulose acetate as necessary. Can also be used. The basis weight of fibers, when fiber stacking flocculent pulp or short fibers, for example, be a 100 to 300 g / m ² approximately, in the case of a filament aggregate, for example, be 30 to 120 g / m ² approximately 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. 8 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 It is preferable because the fit of the rising gather 60 around the legs is improved.

The size of the absorber 56 can be appropriately determined as long as it extends to the front, back, left, and right of the urination port position, but it is preferable that the size of the absorber 56 extends to the peripheral edge of the interior body 200 or its vicinity in the front-rear direction LD and the width direction WD. .. Reference numeral 56X indicates the entire width of the absorber 56.

(Highly absorbent polymer particles)
The absorber 56 may contain high-absorbent polymer particles in part or all of the absorber 56. The highly absorbent polymer particles include "powder" in addition to "particles". As the highly absorbent polymer particles 54, those used for this type of disposable diaper can be used as they are. For example, they are sifted 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 on the sieve is 30% by weight or less, and the proportion of particles remaining on the sieve is determined by sieving (shaking for 5 minutes) using a standard sieve of 180 μm (JIS Z8801-1: 2006). 60% by weight or more is desirable.

The material of the highly absorbent polymer particles can be used without particular limitation, but those having a water absorption of 40 g / g or more are preferable. Highly absorbable 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 celluloses. A substance or an acrylic acid (salt) polymer or the like can be used. As the shape of the highly absorbent polymer particles, a powder or granular material that is usually used 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, the liquid supplied into the absorber 56 tends to return to the outside of the absorber 56, so-called reversion.

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 amount of the highly absorbent polymer particles to be coated 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 polymer coating amount is less than 50 g / m ² , it becomes difficult to secure the absorption amount. Above 350 g / m ² , the effect saturates.

If necessary, the highly absorbent polymer particles can adjust the spray density or the spray amount in the plane direction of the absorber 56. For example, the amount of liquid excreted at the site can be increased as compared with other sites. When considering the difference between men and women, the spray density (amount) on the front side can be increased for men, and the spray density (amount) on the central part can be increased for women. Further, it is also possible to provide a portion where the polymer does not exist locally (for example, in a spot shape) in the plane direction of the absorber 56.

(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, 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 texture is preferably 5 to 40 g / m ² , especially 10 to 30 g / m ² .

The packaging form 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 components 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.

(Exterior body)
The exterior bodies 12F and 12B in the illustrated example are the front exterior body 12F, which is a portion constituting at least the waist circumference portion of the front body F (the range in the front-rear direction corresponding to the waist circumference region T), and 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 and are separated from each other in the front-rear direction LD. The separation distance 12d can be, for example, about 150 to 250 mm.

Further, in the illustrated example, the rear exterior body 12B has a longer front-rear dimension than the front exterior body 12F, and the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear The side exterior body 12B has a buttock cover portion C extending from the waist circumference region T to the intermediate region L side. 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.

In the exterior bodies 12F and 12B, as shown in FIGS. 4 and 5, the outer sheet layer 12S and the inner sheet layer 12H located on the outer and inner sides of the elastic members 15 to 19 described later are hot-melt adhesive, welded, etc. It is joined by the joining means of. The sheet material forming the outer sheet layer 12S and the sheet material forming the inner sheet layer 12H 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 exterior body, the inner sheet layer is formed by the inner part and the outer part of one sheet material folded back at the edge of the waist opening WO (which may be the edge on the crotch side). 12H and the outer sheet layer 12S are formed, respectively. The former form has an advantage that the number of materials of the sheet material is small, and the latter form has an advantage that the positions are less likely to shift when the inner sheet layer 12H and the outer sheet layer 12S are bonded together. The illustrated example corresponds to the latter, and the sheet material forming the inner sheet layer 12H extends only to the edge of the waist opening WO, but the sheet material forming the outer sheet layer 12S is the inner sheet layer 12H. The folded portion 12r is formed by wrapping around the edge of the sheet material on the WO side of the waist opening and folding back inside. In the posterior exterior body 12B, the second exterior portion 72 is formed by the folded-back portion 12r. Further, in the front exterior body 12F, the front end portion of the interior body 200 is covered by the folded-back portion 12r.

The sheet material used for the outer sheet layer 12S and the inner sheet layer 12H can be used without particular limitation, but a non-woven fabric is preferable. For example, olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester-based and polyamide-based, and two of these. A non-woven fabric made of mixed fibers, composite fibers, or the like in which seeds or more are used can be used. Further, the non-woven fabric may be produced by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When a non-woven fabric is used, the texture is preferably about 10 to 30 g / m ² .

As in the examples shown in FIGS. 17 and 18, an integrated exterior body 12 that is continuous through the crotch from the front body F to the back body B can also be adopted.

(Expandable area / non-expandable area)
Elastic members 15 to 19 are provided between the outer sheet layer 12S and the inner sheet layer 12H on the outer bodies 12F and 12B in order to improve the fit to the waist circumference of the wearer, and the elastic members expand and contract in the width direction. An elastic region A2 that elastically expands and contracts is formed in the WD. In this expansion / contraction region A2, in the state of natural length, the outer sheet layer 12S and the inner sheet layer 12H contract with the contraction of the elastic member to form wrinkles or folds, and when the elastic member extends in the longitudinal direction, the outer side The sheet layer 12S and the inner sheet layer 12H can be stretched to a predetermined stretch rate without wrinkles. As the elastic members 15 to 19, known elastic members such as strip-shaped, net-shaped, and film-shaped can be used without particular limitation in addition to elongated elastic members such as rubber threads (illustrated example). As the elastic members 15 to 19, synthetic rubber or natural rubber may be used.

For bonding the outer sheet layer 12S and the inner sheet layer 12H on the exterior bodies 12F and 12B and fixing the elastic members 15 to 19 sandwiched between them, hot melt adhesives and heat seals or ultrasonic seals are used by various coating methods. At least one of the fixing means by welding the material such as the above can be used. If the entire surfaces of the exterior bodies 12F and 12B are firmly fixed, the flexibility is impaired. Therefore, it is preferable that the parts other than the adhesive portion of the elastic members 15 to 19 are not adhered or are weakly adhered. In the illustrated example, the hot melt adhesive is applied only to the outer peripheral surfaces of the elastic members 15 to 19 by an application means such as a comb gun or a sure wrap nozzle, and the elastic members 15 to 19 are sandwiched between the two sheet layers 12S and 12H. The structure is such that the elastic members 15 to 19 are fixed to both sheet layers 12S and 12H and the elastic members 15 to 19 are fixed between both sheet layers 12S and 12H only by the hot melt adhesive applied to the outer peripheral surface of the sheet. The elastic members 15 to 19 can be fixed to the outer sheet layer 12S and the inner sheet layer 12H only at both ends in the expansion / contraction direction in the expansion / contraction region.

Explaining the elastic members 15 to 19 of the illustrated example in more detail, a plurality of waist elastic members 17 are spaced apart from each other in the front-rear direction on the waist portions W of the exterior bodies 12F and 12B so as to be continuous over the entire width direction WD. It is installed with a space. Of the waist elastic members 17, one or a plurality of members arranged in the region adjacent to the lower waist U may overlap the interior body 200, or the central portion in the width direction overlapping the interior body 200 may be provided. Except for this, it may be provided on both sides in the width direction.

As shown in the example shown in FIG. 13, the waist elastic member 17 can be provided between the outer sheet layer 12S and the inner sheet layer 12H in the first exterior portion 71, but is incorporated in the second exterior portion 72 (not shown). Or, as in the example shown in FIGS. 1, 5, 9, and 10, in the area having the pocket 90, it passes between the second exterior portion 72 and the second interior portion 82, and both sides of the pocket 90. Then, it is preferable to pass between the second exterior portion 72 and the first exterior portion 71. By attaching the waist elastic member 17 as in the latter case, the inner surface of the waist portion W, that is, the inner surface of the second exterior portion 72 is surely brought into close contact with the body surface, and the second exterior portion 72 is integrated with the second exterior portion 72. The interior portion 82 can be lifted to keep the entrance of the pocket 90 open.

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 section 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 3 to 22 thread rubbers (about ² ) at intervals of 4 to 12 mm, and the elongation rate of the WD in the width direction of the waist portion W by this is about 150 to 400%, particularly about 220 to 320%. Is preferable. Further, the waist portion W does not need to use the waist portion elastic member 17 having the same thickness or the same extension rate for all of the LDs in the front-rear direction. For example, the elastic members 17 are formed at the upper and lower portions of the waist portion W. The thickness and the elongation rate may be different.

Further, between the outer sheet layer 12S and the inner sheet layer 12H in the lower waist portion U of the exterior bodies 12F and 12B, a plurality of lower waist elastic members 15 and 19 made of elongated elastic members are spaced apart in the front-rear direction. It is installed open.

The elastic members 15 and 19 at the lower waist have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, a cross section of 0.05 to 1.5 mm ^{2 in} the case of natural rubber, especially 0.1 to 0). It is preferable to provide about 5 to 30 elastic strips (about 1.0 mm ² ) at intervals of 1 to 15 mm, particularly 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, a cover elastic member 16 made of an elongated elastic member is attached between the outer sheet layer 12S and the inner sheet layer 12H in the buttock cover portion C of the posterior exterior body 12B. The buttock cover portion C is contracted toward the center of the WD in the width direction by the cover portion elastic member 16.

The cover elastic member 16 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 a rubber thread (about ² ), and the elongation rate of the WD in the width direction of the buttocks cover portion C is preferably 150 to 400%, particularly 250 to 350%.

On the other hand, when the inguinal cover portion is provided on the front exterior body 12F, the cover portion elastic member can be provided in the same manner as the buttock cover portion C (not shown).

When elastic members 15, 16 and 19 are provided in the front-rear direction range having the absorber 56 as in the lower waist portion U and the buttock cover portion C in the illustrated example, the width direction of the absorber 56 in a part or all of them. In order to prevent the contraction of the WD, the middle width direction (preferably including the entire inner / outer joint portions 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. , Both sides in the width direction are defined as the expansion / contraction region A2. The waist portion W is preferably a 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.

In such an elastic region A2 and a non-expandable region A1, elastic members 15 to 17, 19 are supplied between the inner sheet layer 12H and the outer sheet layer 12S, and the elastic members 15, 16 and 19 are stretched regions A2. At least at both ends in the expansion / contraction direction, the elastic members 15, 16 and 19 are pressed and fixed in the non-stretchable region A1 and not fixed in the non-stretchable region A1. It can be constructed by cutting at one place in the middle in the width direction by heating, or by finely cutting at a large number of places to kill the elasticity in the non-stretchable region A1 while leaving the elasticity in the stretchable region A2. In the former case, as shown in FIG. 4, the non-stretchable region A1 is in a state where the elastic members 15, 16 and 19 continuous from the elastic members 15, 16 and 19 of the stretchable region A2 are contracted to their natural lengths as the unnecessary elastic members 18. It will remain between the outer sheet layer 12S and the inner sheet layer 12H, and in the latter case, although not shown, the cutting balance continuous from the elastic members 15, 16 and 19 of the elastic region A2, and the elastic member 15 of both elastic regions A2. The cut pieces of the elastic member that are not continuous with, 16 and 19 remain between the outer sheet layer 12S and the inner sheet layer 12H in a state of being independently contracted to the natural length as an unnecessary elastic member.

(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 cover non-woven fabric 13 that covers the back surface of the interior body 200 is provided between the front exterior body 12F and the interior body 200 and between the rear exterior body 12B and the interior body 200.

The non-woven fabric used for the cover non-woven fabric 13 is not particularly limited depending on the type of fibers and the method of binding (entangled) the fibers, for example, the same materials as those of the exterior bodies 12F and 12B can be appropriately selected. , It is desirable to use an air-through non-woven fabric, in which case the texture is preferably 20 to 40 g / m ² and the thickness is preferably 0.3 to 1.0 mm. As the cover nonwoven fabric 13, a non-woven fabric having no holes penetrating the front and back may be used, or a perforated nonwoven fabric having a large number of holes penetrating the front and back at intervals may be used.

The range in the front-rear direction of the cover non-woven fabric 13 is not particularly limited, and as shown in FIGS. 2 and 5, it may extend in the front-rear direction LD over the entire area from the front end to the rear end of the interior body 200, and is shown in FIG. As shown, it extends in the front-rear direction LD from the front-rear intermediate position of the region where the front exterior body 12F and the interior body 200 overlap to the front-rear direction intermediate position of the region where the rear exterior body 12B and the interior body 200 overlap. May be good. Further, in the case of the example shown in FIG. 8, the length 13y in the front-rear direction of the overlapping portion between the cover nonwoven fabric 13 and the front exterior body 12F and the length 13y in the front-rear direction of the overlapping portion between the cover nonwoven fabric 13 and the rear exterior body 12B are It can be set as appropriate, but usually it can be about 20 to 40 mm.

The width direction range of the cover non-woven fabric 13 is a range in which the exposed portion on the back surface of the liquid impermeable sheet 11 can be hidden. Therefore, in the illustrated example, since the liquid-impermeable sheet 11 is exposed between the base ends of the left and right rising gathers 60, the base end of at least one rising gather 60 is from the back side of the base end portion of the other rising gather 60. The cover non-woven fabric 13 is provided so as to cover the width direction range up to the back side of the portion. As a result, the liquid-impermeable sheet 11 can be concealed by the cover non-woven fabric 13 and the gathered non-woven fabric 62 of the rising gather 60. Further, even if both ends in the width direction of the cover non-woven fabric 13 are raised and do not cover the back side of the base end portion of the gather 60, but the gather non-woven fabric 62 covers the back side of both ends in the width direction of the cover non-woven fabric 13, the cover non-woven fabric 13 is covered. It is possible to conceal the liquid-impermeable sheet 11 with the gathered non-woven fabric 62. In this case, since both sides of the cover nonwoven fabric 13 are covered with the gathered nonwoven fabric 62, there is an advantage that both sides of the cover nonwoven fabric 13 are less likely to be peeled off from the liquid-impermeable sheet 11.

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. The fixed region of the cover non-woven fabric 13 may be the entire front-rear direction and the entire width direction of the cover non-woven fabric 13, or may be partially non-fixed. For example, if both ends of the cover non-woven fabric 13 in the width direction are not fixed, the cover non-woven fabric 13 is less susceptible to the influence of the rising gather 60 even if the side portion of the absorber 56 is slightly contracted, and wrinkles and folds are formed on the cover non-woven fabric 13. It has the advantage of being less likely to be. In this case, the width of the non-fixed portions at both ends of the cover nonwoven fabric 13 in the width direction may be appropriately determined, and may be, for example, 3 to 10 mm, preferably 5 to 8 mm.

(Inner and outer joints)
The first interior portion 81 of the interior body 200 and the first exterior portion 71 of the exterior bodies 12F and 12B may be joined by a joining means by material welding such as heat sealing and ultrasonic sealing, or by a hot melt adhesive. it can. In the illustrated example, the exterior body 12F via the hot melt adhesive applied to the back surface of the first interior portion 81 of the interior body 200, that is, the back surface of the liquid impermeable sheet 11 and the root portion 65 of the rising gather 60 in this case. , 12B is fixed to the inner surface of the first exterior portion 71. As shown in FIG. 2, the inner / outer joints 201 and 202 for fixing 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.

<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 (vertical) direction" means the direction connecting the ventral side (front side) and the dorsal side (rear side), and the "width direction" means the direction orthogonal to the front-back direction (horizontal direction).

・ "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 a value when the natural length is 100%.

-"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% Add 1.0 g of highly absorbent polymer to 49.0 g (mixed product) and stir 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).

-"Grandming" 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 constant weight of a sample or test piece 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 was measured, 10 0 times to calculate the weight per square meter, a 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 superabsorbent polymer" was performed using 2 g of superabsorbent polymer and 50 g of physiological saline. ..

-"Unfolded state" means a state in which the unfolded state is 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.

11 ... Liquid permeable sheet, 12A ... Side seal part, 12B ... Rear exterior body, 12F ... Front exterior body, 12H ... Inner sheet layer, 12S ... Outer sheet layer, 13 ... Cover non-woven fabric, 16 ... Cover elastic member , 17 ... Waist elastic member, 18 ... Unnecessary 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 ... Base side part, 62 ... Gather non-woven fabric, 63 ... Gather elastic member, 67 ... Folded part, 68 ... Rise part, 71 ... First exterior part, 72 ... No. 2 exterior part, 81 ... first interior part, 82 ... second interior part, 90 ... pocket, A1 ... non-stretchable area, A2 ... stretchable area, C ... buttock cover part, L ... intermediate area, LD ... front-back direction, T ... waist area, U ... lower waist, W ... waist, WD ... width direction, WO ... waist opening, LO ... leg opening.