CN107970093B

CN107970093B - Pants-type disposable diaper

Info

Publication number: CN107970093B
Application number: CN201710966272.0A
Authority: CN
Inventors: 井手彩; 森洋介
Original assignee: Daio Paper Corp
Current assignee: Daio Paper Corp
Priority date: 2016-10-21
Filing date: 2017-10-17
Publication date: 2021-08-20
Anticipated expiration: 2037-10-17
Also published as: CN107970093A; WO2018074399A1; CN208611124U; TW201817404A; TWI744394B

Abstract

The invention provides a pants-type disposable diaper, which can improve the fit around the legs of the pants-type disposable diaper of an outer divided type, and particularly improve the fit of the crotch part when sitting or walking. The above-described object is achieved by a shorts-type disposable diaper in which a front side outer covering body and a rear side outer covering body are separated in a front-rear direction at a front-rear direction intermediate position, an inner covering body extends from the front side outer covering body to the rear side outer covering body in the front-rear direction, and is joined to the front side outer covering body and the rear side outer covering body, respectively, wherein an inner-outer joint portion joining the inner covering body and the front side outer covering body is provided over both ends in a width direction on a waist side, a width of the inner-outer joint portion decreases stepwise or continuously as it goes toward an edge on a crotch side of the front side outer covering body, and non-joined portions where the inner covering body and the front side outer covering body are not joined are provided at both ends in the width direction on the crotch side of the front side outer covering body.

Description

Pants-type disposable diaper

Technical Field

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

Background

Generally, a pants-type disposable diaper includes: an exterior body which constitutes a front body part and a rear body part separately or integrally; and an inner body including an absorber, which is attached to the outer body so as to extend from the front body portion to the back body portion, wherein both side edges of the outer body of the front body portion and both side edges of the outer body of the back body portion are joined together to form side seals, thereby forming a waist opening and a pair of left and right leg openings.

In such a pants-type disposable diaper, in order to improve the fit to the body, the outer body is formed in a laminated structure having a plurality of sheet layers, and various elastic members are attached between the sheet layers in an extended state, wherein the fit to the body is relatively high in the following structure: in a waist region defined as a range in the front-rear direction corresponding to the side seals or in an intermediate region between the front and rear waist regions, elongated elastic members extending in the width direction are attached at intervals in the front-rear direction and each extending in the width direction (see, for example, patent documents 1 to 5).

As one form of a pants-type disposable diaper, there is known a pants-type disposable diaper including: an exterior body formed in a tubular shape by joining both side portions of the front side exterior body and both side portions of the rear side exterior body at side seal portions; and an inner body for absorbing excrement, which is provided from the inner surface of the front outer body to the inner surface of the rear outer body, and which is separated from the front outer body and the rear outer body in the front-rear direction without being continuous on the crotch side (see, for example, patent documents 2 to 5). Such an exterior two-part diaper has the following advantages: in order to form the leg openings, the exterior body may not be cut out, or the exterior body may be cut out in a small area. Namely, there are advantages in that: since the cut pieces (trimmings) are discarded, waste of the material (trimmings loss) can be suppressed.

In a pants-type disposable diaper of the exterior two-piece type, an inner and outer joint portion for joining an interior body to a front side exterior body and a rear side exterior body is generally provided over substantially the entire region where the two overlap.

However, in the pants-type disposable diaper of the outer two-piece type, the crotch-side edge of the outer body is linear or nearly linear along the width direction and intersects with the side edge of the inner body at a right angle or nearly a right angle, so that the fitting around the legs tends to be insufficient, and particularly, there is room for improvement in the fitting of the crotch portion during sitting or walking at the crotch-side edge of the front outer body.

Patent document 1: japanese patent laid-open publication No. 2004-073428

Patent document 2: japanese Kokai publication No. 2006-525857

Patent document 3: japanese patent laid-open publication No. 2011-147516

Patent document 4: japanese patent laid-open publication No. 2014-028308

Patent document 5: japanese patent No. 4964993

Disclosure of Invention

Therefore, a main object of the present invention is to improve the fit around the legs of an outer-fitting two-part pants-type disposable diaper, and particularly to improve the fit of the crotch portion when sitting or walking.

A typical embodiment of the present invention that solves the above problems is as follows.

< mode 1 >)

A pants-type disposable diaper separately provided with a front side outer covering body constituting at least a waist portion of a front body portion and a rear side outer covering body constituting at least a waist portion of a rear body portion, the front side outer covering body and the rear side outer covering body being separated in a front-rear direction at a middle in the front-rear direction, an inner covering body incorporating an absorber extending in the front-rear direction from the front side outer covering body up to the rear side outer covering body and being joined to the front side outer covering body and the rear side outer covering body, respectively, the pants-type disposable diaper being provided with a side seal, a waist opening, and a pair of left and right leg openings formed by joining both side portions of the front side outer covering body and both side portions of the rear side outer covering body together, respectively, characterized in that an inner-outer joint portion joining the inner-outer joint portion and the front side outer covering body together is provided over both end portions in a waist side direction, and a width of the inner-outer joint portion is gradually or continuously reduced toward an edge on a crotch side of the front side outer covering body, the front side exterior body has non-joined portions at both ends in the width direction of the crotch side, where the interior body and the front side exterior body are not joined together.

(Effect)

If the inner and outer joint portions joining the interior body and the front side exterior body together are in the shape of the present aspect 1, even in the exterior two-division type in which the crotch-side edge of the front side exterior body intersects the side edge of the interior body in a linear or nearly linear shape along the width direction at a right angle or a nearly right angle, so that the degree of freedom of the interior body of the front body portion is increased, the fit of the thigh portion during sitting or walking can be improved.

< 2 nd mode >)

The pants-type disposable diaper according to claim 1, wherein the inner body includes a three-dimensional gather portion rising from both side portions, and the three-dimensional gather portion includes: a body section having a root side portion extending from both side portions of a front surface of the interior body toward a widthwise central side and a distal end side portion extending from a distal end of the root side portion toward a widthwise outer side; a recessed portion in which both front and rear end portions of the main body portion are fixed to the front surface of the interior body in a recessed state; a floating free portion located between the front and rear lodging portions; and a gather portion elastic member provided at least at a terminal end portion of the free portion in the front-rear direction, the three-dimensional gather portion having a front-side half-laid portion continuous with or adjacent to a rear side of the laid portion on the front side, in the front-side half-laid portion, the root-side portion being joined to the front face of the interior body in a laid state, and the terminal end portion and the root end portion not being joined together.

(Effect)

If the leg hole gathers are curved such that the root side portions thereof rise obliquely toward the widthwise central side and the end side portions thereof rise obliquely from the intermediate portions toward the widthwise outer side, the gathers rise three-dimensionally and highly even in the vicinity of the intersection where the inner body and the outer body intersect, and the fit around the legs can be improved, which is preferable.

However, in the pants-type disposable diaper of the exterior two-part type, the distance from the position of the inner body in the crotch portion to the position of intersection with the outer body is long when the diaper is worn, and therefore the inner body is likely to swing left and right about the intersection position as a fulcrum. In particular, when the degree of freedom of the inner body of the front body portion is increased as in the case of the 1 st aspect, the lateral swinging of the inner body becomes larger, and therefore, even if the three-dimensional gather portion in a curved form is provided, the body fit position may become unstable.

On the other hand, if the front half-folded portion as in the present aspect 2 is provided, the height of the three-dimensional gather portion is increased in stages, and the body fit position of the front half-folded portion is easily stabilized, so that even if the inner body moves left and right, the body fit position of the three-dimensional gather portion does not largely swing, and the fit of the three-dimensional gather portion to the crotch portion becomes good, which is preferable.

< mode 3 >)

The pants-type disposable diaper according to claim 2, wherein the front-side half-lying portion extends to the same position as a rear edge of the front-side outer covering or further extends from the rear edge of the front-side outer covering toward a front-rear direction center side.

(Effect)

The range of the front-rear direction of the front half-folded portion may be appropriately determined, but if the front half-folded portion includes an intersection portion where the inner body and the outer body intersect as in the present aspect 3, the stability against lateral movement of the inner body and the fit of the three-dimensional gather portion to the crotch portion are both good, which is preferable.

< 4 th mode >)

The pants-type disposable diaper according to claim 2 or 3, wherein a front edge of the non-joined portion is located at a portion on a rear side of the front-side half-laid portion.

(Effect)

Such a configuration is preferable because the front half-lodging portion can function particularly effectively.

< 5 th mode >)

The pants-type disposable diaper according to any 1 of aspects 2 to 4, wherein the absorbent body has a constricted portion at a middle in a front-rear direction, the constricted portion having a width smaller than widths of both front and rear sides of the constricted portion, and the front-side semi-laid portion is positioned on the absorbent body so as not to overlap the constricted portion.

(Effect)

Thus, when the three-dimensional gather portion having the front half-laid portion as described above is provided, the root of the three-dimensional gather portion becomes stable, and the front half-laid portion is easily raised.

< mode 6 >)

The pants-type disposable diaper according to any 1 of claims 2 to 5, wherein the three-dimensional gather portion has a rear half-laid portion which is continuous with or adjacent to a front side of the laid portion on the rear side, the rear half-laid portion has a tip side portion which is joined to the root side portion in a laid state, and the root side portion is not joined to the front surface of the inner body.

(Effect)

If both the front half-folded portion in which only the distal end portion is free and the rear half-folded portion in which only the proximal end portion is free are provided in this manner, the three-dimensional gather portion can rise high over a long range in the front-rear direction, and the distal end portion and the proximal end portion do not excessively become free, respectively, so that the fit around the entire leg portion becomes good.

< 7 th mode >)

The pants-type disposable diaper according to any 1 of claims 1 to 6, wherein an elastic member that elastically stretches and contracts in a width direction is provided in the non-joined portion of the front side exterior body.

(Effect)

This further improves the fit of the thigh portion when sitting or walking.

As described above, according to the present invention, there are advantages as follows: the fitting around the leg, particularly the fitting of the thigh when sitting or walking, can be improved in an exterior two-part pants-type disposable diaper.

Drawings

Fig. 1 is a plan view showing an inner surface of a pants-type disposable diaper in an unfolded state.

Fig. 2 is a plan view showing an outer surface of the pants-type disposable diaper in an unfolded state.

Fig. 3 is a sectional view taken along line 2-2 in fig. 1.

Fig. 4 is a sectional view taken along line 3-3 of fig. 1.

Fig. 5(a) is a sectional view taken along line 4-4 of fig. 1, and fig. 5(b) is a sectional view taken along line 5-5 of fig. 1.

Fig. 6 is a perspective view of a pants-type disposable diaper (holes omitted).

Fig. 7 is a plan view showing the outer surface of the interior body in the expanded state.

Fig. 8 is a plan view showing the outer surface of the interior body in the expanded state together with the outline of the exterior body.

Fig. 9 is a plan view showing only an important part of the outer surface of the pants-type disposable diaper in the unfolded state.

Fig. 10(a) is a plan view showing an important part of the front side of the pants-type disposable diaper in an unfolded state, fig. 10(b) is a cross-sectional view taken along the line 6-6 of fig. 10(a), and fig. 10(c) is a cross-sectional view taken along the line 7-7 of fig. 10 (a).

Fig. 11(a) is a plan view showing an important part of the rear and front sides of a pants-type disposable diaper in an unfolded state, fig. 11(b) is a cross-sectional view taken along the line 6-6 of fig. 11(a), and fig. 11(c) is a cross-sectional view taken along the line 7-7 of fig. 11 (a).

Fig. 12 is a sectional view taken along line 2-2 in fig. 1, showing another mode.

Fig. 13 is a sectional view taken along line 3-3 in fig. 1, showing another mode.

Fig. 14(a) is a perspective view showing the holes of the perforated nonwoven fabric, fig. 14(b) is a plan view showing the holes of the perforated nonwoven fabric, and fig. 14(c) is a cross-sectional view taken along line 8-8 in fig. 14 (b).

Fig. 15(a) is a perspective view showing the holes of the perforated nonwoven fabric, fig. 15(b) is a plan view showing the holes of the perforated nonwoven fabric, and fig. 15(c) is a cross-sectional view taken along line 8-8 in fig. 15 (b).

Fig. 16(a) is a perspective view showing the holes of the perforated nonwoven fabric, fig. 16(b) is a plan view showing the holes of the perforated nonwoven fabric, and fig. 16(c) is a cross-sectional view taken along line 8-8 in fig. 16 (b).

Fig. 17(a) to 17(e) are enlarged plan views of important parts of the apertured nonwoven fabric.

Fig. 18(a) and 18(c) are cross-sectional views of bonded portions of the hood nonwoven fabric, and fig. 18(b) and 18(d) are plan views of bonded portions of the hood nonwoven fabric.

Fig. 19 is a plan view showing a change in application of the hot melt adhesive.

Fig. 20(a), 20(c), and 20(e) are cross-sectional views of bonded portions of the hood nonwoven fabric, and fig. 20(b), 20(d), and 20(f) are plan views of bonded portions of the hood nonwoven fabric.

Fig. 21 is a sectional view showing an important part of a portion having a display piece.

Fig. 22(a) and 22(b) are perspective views showing important parts of a pants-type disposable diaper.

Fig. 23 is a plan view showing the outer surface of the pants-type disposable diaper in an unfolded state.

Fig. 24(a) is a sectional view taken along line 4-4 in fig. 23, and fig. 24(b) is a sectional view taken along line 5-5 in fig. 23.

Description of the reference symbols

11: a liquid-impermeable sheet; 12B: a rear-side outer housing; 12E: a waist extension; 12F: a front side outer package; 12H: an inner sheet layer; 12S: an outer sheet layer; 13: covering non-woven fabrics; 14: an aperture; 17: a waist elastic member; 18: redundant elastic members; 200: an interior body; 201. 202: an inner and outer joint portion; 203: a non-engaging portion; 25: a display sheet; 30: a topsheet; 40: an intermediate sheet; 50: an absorbent member; 56: an absorbent body; 58: packaging the sheet; 60: a side gather portion; 60A: a tip side portion; 60B: a root side portion; 62: a gather portion nonwoven fabric; 67: a lodging part; 68B: a rear half-lodging portion; 68F: a front half-lodging portion; a1: a non-stretch region; a2: a telescoping region; l: a middle region; LD: a front-back direction; t: a waist region; u: a lower waist portion; w: a waist part; WO: the waist is open.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the drawings. The dotted portion in the cross-sectional view indicates an adhesive as a joining means for joining the respective constituent members positioned on the front and back sides thereof, and is formed by full-surface application of a hot-melt adhesive, linear (ビード) application, curtain (カーテン) application, critical portion (サミット) application or spiral application, pattern application (transfer of a hot-melt adhesive by a relief method), or the like, or a fixed portion of an elastic member is formed by applying the adhesive to the outer peripheral surface of the elastic member instead of or together with the adhesive by an application gun, size application, or the like. Examples of the hot melt adhesive include EVA adhesives, adhesive rubber adhesives (elastic adhesives), olefin adhesives, and polyester polyamide adhesives, and can be used without particular limitation. As a joining means for joining the respective constituent members, a material-based welding means such as heat sealing or ultrasonic sealing may be employed.

Fig. 1 to 13 show an example of a pants-type disposable diaper. The pants-type disposable diaper comprises: a front side outer body 12F constituting at least a waist portion of the front body portion F; a rear side outer body 12B constituting at least a waist portion of the back body portion B; and an interior body 200 provided inside the

exterior bodies

12F, 12B so as to extend from the front side exterior body 12F to the rear side exterior body 12B through the crotch portion, wherein both side portions of the front side exterior body 12F and both side portions of the rear side exterior body 12B are joined to form side seal portions 12A, whereby openings formed in the front and rear end portions of the

exterior bodies

12F, 12B serve as waist openings WO through which the waist of the wearer passes, and portions surrounded by the lower edges of the

exterior bodies

12F, 12B and the side edges of the interior body 200 on both sides in the width direction of the interior body 200 serve as leg openings LO through which legs pass. The inner body 200 is a portion for absorbing and retaining excrement such as urine, and the

outer bodies

12F and 12B are portions for supporting the inner body 200 with respect to the body of the wearer. In addition, reference numeral Y denotes the entire length of the diaper in the developed state (the longitudinal length 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 reference numeral X denotes the full width of the diaper in the developed state.

The pants-type disposable diaper of the present embodiment has a waist region T defined as a front-rear direction range (a front-rear direction range from the waist opening WO to the upper end of the leg opening LO) having the side seals 12A, and an intermediate region L defined as a front-rear direction range of a portion forming the leg opening LO (between the front-rear direction region of the front body portion F having the side seals 12A and the front-rear direction region of the rear body portion B having the side seals 12A). The waist region T can be conceptually divided into a "waist portion" W forming an edge portion of the waist opening and a "waist lower portion" U being a portion below the waist opening. In general, in the case where a boundary where the stretching stress in the width direction WD changes (for example, the thickness and the elongation of the elastic member change) is present in the waist region T, a portion closer to the waist opening WO than the boundary closest to the waist opening WO becomes the waist portion W, and in the case where such a boundary is absent, a portion closer to the waist opening WO than the absorbent body 56 or the interior body 200 becomes the waist portion W. The length in the front-back direction thereof may be appropriately determined depending on the size of the product, and for example, the waist portion W may be 15 to 40mm, and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are narrowed in an コ shape or a curved shape along the circumference of the leg of the wearer, which is a region into which the leg of the wearer is inserted. As a result, the pants-type disposable diaper in an unfolded state is formed into a substantially hourglass shape as a whole.

(inner body)

The inner body 200 may have any shape, but is rectangular in the illustrated embodiment. As shown in fig. 3 to 5(b), the interior body 200 includes: a topsheet 30 on the body side; a liquid-impermeable sheet 11; and an absorbent member 50 interposed between the top sheet 30 and the liquid-impermeable sheet 11, wherein the interior body 200 is a main body portion having an absorbent function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent member 50 in order to rapidly move the liquid having permeated the top sheet 30 toward the absorbent member 50, and reference numeral 60 denotes side gather portions 60 extending from both side portions of the inner body 200 so as to contact the peripheries of the legs of the wearer in order to prevent leakage of excrement to both sides of the inner body 200.

(Top sheet)

The top sheet 30 has a liquid-permeable property, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. The kind of the raw material fiber of the nonwoven fabric is not particularly limited. Examples thereof include olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, regenerated fibers such as rayon and cuprammonium fibers, natural fibers such as cotton, and the like, and mixed fibers and composite fibers using two or more of these fibers. Further, the nonwoven fabric may be produced by any process. Examples of the processing method include a spunlace method, a spunbond method, a hot-rolling method, a melt-blowing method, a needle-punching method, a hot-air method, and a point-bonding method. For example, when flexibility and drapability are desired, the spunbond method and the spunlace method are preferred processing methods, and when bulkiness and flexibility are desired, the hot air method, the spot-bonding method, and the hot-rolling method are preferred processing methods.

The top sheet 30 may be composed of one sheet, or may be composed of a laminate sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be formed of one sheet or two or more sheets in the planar direction.

Both side portions of the top sheet 30 may be folded back toward the back surface side at the side edges of the absorbent member 50, or may be extended laterally beyond the side edges of the absorbent member 50 without being folded back.

For the purpose of preventing the top sheet 30 from being displaced from the rear surface side member, it is desirable to fix the top sheet 30 to the member adjacent on the rear surface side by a bonding means based on material fusion such as heat sealing or ultrasonic sealing, or a hot melt adhesive. In the illustrated embodiment, the top sheet 30 is fixed to the front surface of the intermediate sheet 40 and the front surface of the portion of the packaging sheet 58 located on the front surface side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(intermediate sheet)

In order to rapidly transfer the liquid having passed through the top sheet 30 to the absorbent member, an intermediate sheet (also referred to as "second sheet") 40 having a liquid passing speed higher than that of the top sheet 30 may be provided. The intermediate sheet 40 is used for the following purposes: the liquid is rapidly moved toward the absorbent body to improve the absorption performance of the absorbent body and to prevent the phenomenon that the absorbed liquid "flows back" from the absorbent body. The intermediate sheet 40 may also be omitted.

The intermediate sheet 40 may be made of the same material as the top sheet 30, or may be a spun lace nonwoven fabric, a spunbond nonwoven fabric, an SMS nonwoven fabric, a pulp nonwoven fabric, a mixed sheet of pulp and rayon, a point-bond nonwoven fabric, or a crepe paper. In particular, the air-through nonwoven fabric is preferably bulky. In the air-through nonwoven fabric, a composite fiber having a core-sheath structure is preferably used, and in this case, the resin used for the core may be polypropylene (PP), but Polyester (PET) having high rigidity is preferred. The weight per unit area is preferably 17 to 80g/m²More preferably 25 to 60g/m². Of raw material fibers for non-woven fabricsThe thickness is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is preferable to use a bias fiber, a hollow fiber, or a bias and hollow fiber having no core at the center as a mixed fiber of all or a part of the raw material fibers.

The intermediate sheet 40 in the illustrated embodiment is shorter than the width of the absorber 56 and disposed at the center, and 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 entire length of the diaper, may be the same as the length of the absorbent member 50, or may be within a short length range centered on the liquid-receiving region.

For the purpose of preventing the position of the intermediate sheet 40 relative to the rear surface side member from being displaced, it is desirable that the intermediate sheet 40 is fixed to the member adjacent on the rear surface side by a bonding means by material fusion such as heat sealing or ultrasonic sealing, or a hot melt adhesive. In the illustrated embodiment, the intermediate sheet 40 is fixed to the front surface of the portion of the packaging sheet 58 located on the front surface side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(liquid-impermeable sheet)

The material of the liquid-impermeable sheet 11 is not particularly limited, and examples thereof include a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of a nonwoven fabric, and a laminate sheet in which a nonwoven fabric and the like are laminated and bonded to a plastic film. The liquid-impermeable sheet 11 is preferably made of a material having liquid impermeability and moisture permeability, which is preferably used from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by mixing an inorganic filler with an olefin resin such as polyethylene or polypropylene, molding the mixture into a sheet, and then stretching the sheet in one or two axial directions is widely used. In addition, as the liquid-impermeable sheet 11, a sheet having liquid-impermeability without using a plastic film can be used, and such a sheet can be made liquid-impermeable by the following method: a non-woven fabric using micro fine denier fiber is used; a leak-proof reinforcing treatment for reducing the voids of the fibers by applying heat or pressure; and coating with a super absorbent resin, a hydrophobic resin, or a water repellent agent, it is desirable to use a resin film in order to obtain sufficient adhesive strength when bonded to the mask nonwoven fabric 13 described later by a hot melt adhesive.

The liquid-impermeable sheet 11 may be formed to have a width that is accommodated on the back surface side of the absorbent member 50 as shown in the figure, and may extend to both sides of the absorbent member 50 and to both side portions of the surface of the absorbent member 50 on the side of the top sheet 30 in order to improve leakage prevention. The width of the extending portion is preferably about 5 to 20mm on the left and right sides.

Further, a excretion indicator whose color changes by the absorption of a liquid component may be provided on the inner side of the liquid-impermeable sheet 11, particularly on the surface closer to the absorbent body 56.

(side gather parts)

The side gather portions 60 extend along the entire front-back direction LD along both side portions of the interior body 200, and are provided to contact the periphery of the legs of the wearer to prevent side leakage, and in general, both a structure called a three-dimensional gather portion and a structure called a planar gather portion are included.

The side gather portion 60 of the 1 st aspect shown in fig. 1, 3, and 4 is a so-called three-dimensional gather portion that rises from the side portion to the front side of the interior body 200. In the side gather portion 60, the root side portion 60B is obliquely raised toward the widthwise central side, and the portion 60A closer to the distal end side than the intermediate portion is obliquely raised toward the widthwise outer side, but the present invention is not limited thereto, and a suitable modification such as a mode of raising the entire side gather portion toward the widthwise central side as in the later-described 2 nd embodiment may be adopted.

To explain in more detail, the side gather portion 60 of the 1 st aspect is configured as follows: a band-shaped gather nonwoven fabric 62 having a length equal to the length of the interior body 200 in the front-rear direction is folded back in the width direction WD at a portion to be a terminal end and folded into two parts, and a plurality of elongated gather elastic members 63 are fixed between the folded-back portion and a sheet near the folded-back portion at intervals in the width direction WD while being elongated in the length direction. A base end portion (an end portion on the opposite side of the sheet folded-back portion in the width direction WD) of the side gather portion 60 on the opposite side to the tip end portion is a root portion 65 fixed to a side portion of the inner body 200 on the back surface side of the liquid-impermeable sheet 11, and a portion other than the root portion 65 is a main body portion 66 (a portion on the folded-back portion side) protruding from the root portion 65. In addition, the main body portion 66 has: a root side portion 60B extending toward the widthwise central side; and a distal end side portion 60A which is folded back at the distal end of the root side portion 60B and extends outward in the width direction. This embodiment is a surface contact type side gather portion 60, but a line contact type side gather portion 60 that is not folded back to the outside in the width direction may be used. The main body portion 66 has both longitudinal end portions thereof formed as folded portions 67 fixed to the side surface of the top sheet 30 in an unfolded state, and has a longitudinal intermediate portion therebetween formed as a free portion 68 which is not fixed, and the gather portion elastic member 63 extending in the longitudinal direction LD is fixed to at least the distal end portion of the free portion 68 in an extended state. The gather portion elastic member 63 is not fixed to the gather portion nonwoven fabric 62 at the front and rear end portions of the side gather portion 60, but is preferably fixed at least at the end portion to the same position as the crotch side edge of the laid portion 67 or a position closer to the waist than the position, because the standing of the three-dimensional body is stabilized.

In the side gather portion 60 of the first aspect configured as described above, the contraction force of the gather portion elastic member 63 acts to bring the both ends in the front-rear direction closer to each other, but the both ends in the front-rear direction in the main body portion 66 are fixed so as not to rise, whereas the both ends form an unfixed free portion 68 therebetween, and therefore, as shown in fig. 3, only the free portion 68 rises so as to come into contact with the body side. In particular, if the root portion 65 is positioned on the back side of the inner body 200, the free portion 68 rises so as to open outward in the width direction at the crotch portion and the vicinity thereof, and therefore the side gather portion 60 comes into surface contact with the periphery of the leg portion, and the fit is improved.

In the curved form in which the main body portion 66 is constituted by the root side portion 60B extending toward the widthwise central side and the tip side portion 60A folded back at the tip of the root side portion 60B and extending toward the widthwise outer side as in the side gather portion 60 of the present embodiment 1, the tip side portion 60A and the root side portion 60B are joined together in a collapsed state at the falling portion 67, and the root side portion 60B is joined to the top sheet 30 in a collapsed state. For joining the opposed surfaces of the falling portion 67, at least one of hot melt adhesives by various application methods and means based on material fusion such as heat sealing and ultrasonic sealing can be used. In this case, the joining of the root side portion 60B to the top sheet 30 and the joining of the distal end side portion 60A to the root side portion 60B may be performed by the same means, or may be performed by different means. For example, it is preferable that the joining of the root side portion 60B and the top sheet 30 is performed by a hot melt adhesive, and the joining of the tip side portion 60A and the root side portion 60B is performed by material fusion.

In particular, in the case of an exterior two-part type pants-type disposable diaper in which the front side exterior body 12F and the rear side exterior body 12B are separated in the front-rear direction LD, it is preferable that, as shown in fig. 10(a) to 10(c), a front side half-lying portion 68F in which the root side portion 60B is joined to the top sheet 30 in an laid-down state and the tip side portion 60A and the root side portion 60B are not joined is provided continuously or adjacently to the rear side of the front side lying portion 67. In the front half-folded portion 68F, only the distal end side portion 60A is free, and although the height is low, the distal end portion is reliably raised with respect to the top sheet 30 by contraction of the gather elastic member 63, so even in the crotch portion where a gap is likely to occur, the fit of the side gather portion 60 becomes good, and the body fit position is stabilized due to the low height, and therefore, the body fit position of the side gather portion 60 does not largely swing even if the inner body 200 moves left and right. In this case, if the front half-folded portion 68F extends to the same position as the rear edge of the front outer body 12F or further extends toward the front-rear direction center side (that is, the front half-folded portion 68F includes the intersection position of the front outer body 12F and the inner body 200), the stability of the inner body 200 against lateral movement and the fit of the side gather portion 60 to the inguinal portion are both improved, which is preferable. In general, it is preferable that the length of the front-rear direction of the front-side recessed portion 67 is about 0.10 to 0.25 times the length of the interior body 200 in the front-rear direction, and that the dimension of the front-side half recessed portion 68F added thereto in the front-rear direction is about 0.15 to 0.30 times the length of the interior body 200 in the front-rear direction. In fig. 10(a) to 10(c), reference numeral AF denotes a hot melt adhesive for joining the distal portion 60A and the root portion 60B, and reference numeral BF denotes a hot melt adhesive for joining the root portion 60B and the top sheet 30.

Further, if a rear-side half-folded portion 68B is provided continuously or adjacently to the front side of the rear-side folded portion 67 as shown in fig. 11(a) -11 (c), in which the distal-side portion 60A is joined to the root-side portion 60B in the folded state and the root-side portion 60B and the top sheet 30 are not joined together, it is preferable that the distal-side portion 60A of the three-dimensional gather portion is not easily inclined in the opposite direction due to inclination toward the gluteal cleft (cleft buttocks), because of the following factors: only the root side portion 60B is free, and the tip side portion 60A is fixed; and, since the height of the side gather portion 60 is increased stepwise, the body fit position of the rear half-laid portion 68B is easily stabilized, and therefore, even if the inner body 200 moves left and right, the body fit position of the side gather portion 60 does not largely swing. Since the rear half-lying portion 68B abuts against the swollen portion of the buttocks, there is no fear of a gap being generated between the distal end side portion 60A and the body even if it is fixed. In this case, if the rear half-recessed portion 68B extends to the same position as the front edge of the rear outer body 12B or further extends toward the front-rear direction center side (that is, the rear half-recessed portion 68B includes the intersection position of the rear outer body 12B and the inner body 200), the inner body 200 can be stably prevented from falling into the gluteal cleft even when facing the left-right movement of the inner body 200, which is preferable. In this case, it is preferable that the longitudinal length of the rear half-folded portion 68B is longer than the longitudinal length of the rear half-folded portion 67, and in a normal case, it is preferable that the longitudinal length of the rear half-folded portion 67 is about 0.15 to 0.30 times the longitudinal length of the interior body 200, and in addition, the longitudinal length of the rear half-folded portion 68B is about 0.20 to 0.35 times the longitudinal length of the interior body 200. In fig. 11(a) to 11(c), reference sign AF denotes a hot melt adhesive for joining the distal portion 60A and the root portion 60B, and reference sign BF denotes a hot melt adhesive for joining the root portion 60B and the top sheet 30.

As the gather nonwoven fabric 62, a gather nonwoven fabric obtained by subjecting a nonwoven fabric having excellent softness, uniformity and concealment, such as a spunbond nonwoven fabric (SS, SSs, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), or a meltblown nonwoven fabric, to a water repellent treatment using silicon or the like as necessary can be suitably used, and the weight per unit area of the fibers is preferably about 10 to 30g/m². As the gather portion elastic member 63, a rubber thread or the like can be used. When the spandex rubber wire is used, the thickness is preferably 470 to 1240dtex, and more preferably 620 to 940 dtex. The elongation at fixation is preferably 150 to 350%, more preferably 200 to 300%. The term "elongation" refers to a value obtained by setting the natural length to 100%. Further, as shown in the drawing, the waterproof film 64 may be interposed between the gather nonwoven fabrics 62 folded into two, and in this case, the gather nonwoven fabrics 62 may be partially omitted in the portions where the waterproof film 64 is present, but in order to form the appearance and the tactile sensation of the product like a cloth, it is necessary to form at least the outer surfaces of the side gathers 60 from the base end to the distal end by the gather nonwoven fabrics 62 as shown in the drawing.

The number of gather elastic members 63 provided in the free portion of the side gather 60 is preferably 2 to 6, and more preferably 3 to 5. The arrangement interval 60d is preferably 3 to 10 mm. With such a configuration, the skin can be easily brought into surface contact within the range where the gather portion elastic member 63 is disposed. The gather portion elastic member 63 may be arranged not only on the distal end side but also on the proximal end side.

At the free portions 68 of the side gathers 60, at least one of a hot-melt adhesive by various application methods and a fixing means by material fusion such as heat sealing or ultrasonic sealing can be used for bonding the inner layer and the outer layer of the gather nonwoven fabric 62 or fixing the gather elastic member 63 sandwiched therebetween. Since flexibility is impaired if the entire surfaces of the inner layer and the outer layer of the gather nonwoven fabric 62 are bonded, it is preferable that the portions other than the bonded portions of the gather elastic members 63 are not bonded or weakly bonded. In the illustrated embodiment, the structure is as follows: by applying the hot melt adhesive only to the outer peripheral surface of the gather elastic member 63 by an application means such as a coating gun or a glue nozzle and sandwiching the gather elastic member 63 between the inner layer and the outer layer of the gather nonwoven fabric 62, the fixing of the elongated elastic member to the inner layer and the outer layer of the gather nonwoven fabric 62 and the fixing of the inner layer and the outer layer of the gather nonwoven fabric 62 are performed only by the hot melt adhesive applied to the outer peripheral surface of the gather elastic member 63.

Similarly, at least one of a hot melt adhesive by various application methods and a means by material fusion such as heat sealing or ultrasonic sealing can be used for fixing the waterproof film 64 and the gather nonwoven fabric 62 or fixing the folded portion 67 incorporated in the side gather portion 60.

The dimensions of the side gather portion 60 of the 1 st aspect can be determined as appropriate, but in the case of infant use, for example, as shown in fig. 3, the rising height (the widthwise length of the main body portion 66 in the expanded state) W2 of the side gather portion 60 is preferably 15 to 60mm, and particularly preferably 20 to 40 mm. The separation distance W1 between the innermost fold lines in the state where the side gather portion 60 is folded flat parallel to the front surface of the top sheet 30 is preferably 60 to 190mm, and particularly preferably 70 to 140 mm. In the case of adult use, the standing height W2 of the side gather portion 60 (the width-directional length of the main body portion 66 in the expanded state) is preferably 20 to 60mm, and particularly preferably 30 to 55 mm. The separation distance W1 between the innermost fold lines in the state where the side gather portion 60 is folded flat parallel to the front surface of the top sheet 30 is preferably 110 to 190mm, and particularly preferably 120 to 150 mm.

The side gather portion 60 of the first aspect includes only the three-dimensional gather portion, but may include both the three-dimensional gather portion and the planar gather portion, or may include only the planar gather portion. Fig. 12 and 13 show the side gather portion 60 of the 2 nd aspect including both the three-dimensional gather portion and the planar gather portion. Each side gather portion 60 has: a1 st portion 61 (a planar gather portion) protruding to the side of the interior body 200 from a root portion 65 fixed to the side of the interior body 200 on the back surface side of the liquid-impermeable sheet 11; and the 2 nd portion 69 (three-dimensional gather portion) which protrudes from the root portion 65 fixed to both side portions of the top sheet 30 in the interior body 200 toward the front side of the interior body 200. More specifically, a belt-like gather nonwoven fabric 62 having a length equal to the length of the interior body 200 in the front-rear direction is caused to extend laterally from the root portion 65 and to be folded back to the front side at the end of the 1 st section 61, and the folded-back portion to the front side passes through the 1 st section 61 to reach the 2 nd section 69 and is folded back at the end of the 2 nd section 69. The folded portions of the gather nonwoven fabric 62 are bonded together by a hot melt adhesive or the like. The 2 nd portion 69 has both longitudinal ends set as the folded portions 67 fixed to the side surfaces of the top sheet 30 in a folded state, and has a middle longitudinal portion between the longitudinal ends set as a free portion 68 which is not fixed. One or a plurality of gather elastic members 63 along the front-rear direction LD are fixed to at least the front-rear direction intermediate portion of the 1 st portion 61 and the free portion 68 of the 2 nd portion 69 in an extended state, and the free portion 68 of the 2 nd portion 69 contracts in the front-rear direction LD by the contraction force of the gather elastic members to become a three-dimensional gather portion in contact with the leg periphery, and the 1 st portion 61 contracts in the front-rear direction LD to become a planar gather portion in contact with the leg periphery.

The three-dimensional gather portion in the side gather portion 60 of the 2 nd aspect is in a form of rising up to the widthwise central side as a whole, but is not limited thereto, and can be appropriately modified such as to be formed in a curved form as in the side gather portion 60 of the 1 st aspect. Other points related to the 2 nd embodiment, for example, the material of the gather nonwoven fabric 62, the material of the gather elastic member 63, and the like are the same as those of the 1 st embodiment, and therefore, description thereof is omitted.

(absorbing Member)

The absorbent member 50 has: an absorber 56; and a wrapping sheet 58 covering the entire absorbent body 56. The wrapping sheet 58 may be omitted.

(absorber)

The absorbent body 56 may be formed of an aggregate of fibers. As the fiber aggregate, in addition to an aggregate obtained by stacking short fibers such as cotton pulp or synthetic fibers, a filament (filament) aggregate obtained by opening a tow (fiber bundle) of synthetic fibers such as cellulose acetate, if necessary, can be used. The weight per unit area of the fibers may be, for example, about 100 to 300g/m in the case of stacking cotton pulp or short fibers²In the case of the filament aggregate, the amount of the filament aggregate may be, for example, about 30 to 120g/m². The fineness of the synthetic fiber is, for example, 1 to 16dtex, preferably 1 to 10dtex, and more preferably 1 to 5 dtex. In the case of the filament assembly, the filaments may be uncrimped fibers, but crimped fibers are preferable. The crimp of the crimped fibers may be, for example, 5 to 75 crimps per 2.54 cm, preferably 10 to 50 crimps, and more preferably about 15 to 50 crimps. In addition, crimped fibers that are uniformly crimped are often used. The superabsorbent polymer particles are preferably dispersed and held in the absorbent body 56.

The absorbent body 56 may have a rectangular shape, but it is also preferable to form the absorbent body 56 itself and the side gather portions 60 in an hourglass shape having narrowed portions 56N with a width narrower at the front-rear direction middle than at the front-rear direction both sides at the front-rear direction middle than at the front-rear direction middle as shown in fig. 1, 7, and the like, because the fit around the leg portions is improved.

The size of the absorbent body 56 may be appropriately determined as long as it extends over the front, rear, left, and right sides of the urination opening position, but preferably extends to the peripheral edge portion of the inner body 200 or the vicinity thereof in the front-rear direction LD and the width direction WD. Reference numeral 56X denotes the entire width of the absorber 56.

(super absorbent Polymer particles)

The super absorbent polymer particles may be contained in a part or all of the absorbent body 56. The super absorbent polymer particles include "powder" in addition to "particles". As the super absorbent polymer particles 54, particles used in such disposable diapers can be used as they are, and for example, particles having a ratio of particles remaining on the screen of 30% by weight or less in the screening (shaking for 5 minutes) using a 500 μm standard screen (JIS Z8801-1: 2006) and particles having a ratio of particles remaining on the screen of 60% by weight or more in the screening (shaking for 5 minutes) using a 180 μm standard screen (JIS Z8801-1: 2006) are desirable.

The material of the super absorbent polymer particles is not particularly limited, but a material having a water absorption capacity of 40g/g or more is preferable. Examples of the super absorbent polymer particles include high absorbent polymer particles such as starch-based, cellulose-based, and synthetic polymer-based, and high absorbent polymer particles such as starch-acrylic acid (salt) -grafted polymer, saponified product of starch-acrylonitrile copolymer, crosslinked sodium carboxymethylcellulose, and acrylic acid (salt) -based polymer can be used. The shape of the super absorbent polymer particles is preferably a powder shape which is generally used, but other shapes may be used.

The superabsorbent polymer particles preferably have a water absorption rate of 70 seconds or less, particularly 40 seconds or less. If the water absorption rate is too slow, so-called back flow in which the liquid supplied into the absorbent body 56 returns to the outside of the absorbent body 56 tends to occur.

The superabsorbent polymer particles preferably have a gel strength of 1000Pa or more. This can effectively suppress the sticky feeling after liquid absorption even when the absorbent body 56 is formed to be bulky.

The weight per unit area of the super absorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorbent body 56. Therefore, it cannot be said that the concentration of the water is 50 to 350g/m². If the weight per unit area of the polymer is less than 50g/m²It is difficult to ensure the absorption amount. If the weight per unit area of the polymer exceeds 350g/m²The effect is saturated.

The distribution density or the distribution amount of the super absorbent polymer particles can be adjusted in the planar direction of the absorbent body 56, if necessary. For example, the amount of liquid spread at the excretion portion may be made larger than the amount of liquid spread at other portions. In the case of considering the difference between men and women, the distribution density (amount) can be increased in the front side in the case of men, and the distribution density (amount) can be increased in the central portion in the case of women. Further, a portion where no polymer is present may be provided locally (for example, in a dot shape) in the planar direction of the absorbent body 56.

(packaging sheet)

When the packaging sheet 58 is used, a tissue paper (tissue paper), particularly crepe paper, nonwoven fabric, composite laminated (ポリラミ) nonwoven fabric, a sheet with small holes, or the like can be used as a material thereof. However, a sheet in which superabsorbent polymer particles do not come out is desired. When a nonwoven fabric is used instead of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly preferable, and polypropylene, a polyethylene/polypropylene composite material, or the like can be used as the material. The weight per unit area is desirably 5 to 40g/m²Particularly preferably 10 to 30g/m²。

The packaging method of the packaging sheet 58 may be appropriately determined, but from the viewpoints of ease of production, prevention of leakage of superabsorbent polymer particles from the front and rear edges, and the like, the following method is preferred: the packaging sheet 58 is wound in a cylindrical shape so as to surround the front and back faces and both side faces of the absorbent body 56, and the front and back edge portions thereof are exposed from the front and back of the absorbent body 56, and the overlapped portion of the wound and overlapped portion and the front and back exposed portion are joined by joining means such as a hot melt adhesive or material welding.

(outer body)

The

exterior bodies

12F, 12B are not the integral exterior body 12 which is continuous from the front body portion F to the rear body portion B through the crotch as shown in fig. 23, fig. 24(a) and fig. 24(B), but are the following exterior bodies: the front-side outer body 12F is a portion constituting at least a waist portion of the front body portion F, and the rear-side outer body 12B is a portion constituting at least a waist portion of the rear body portion B, and the front-side outer body 12F and the rear-side outer body 12B are discontinuous on the crotch side and separated in the front-rear direction LD. The separation distance 12d may be, for example, about 150 to 250 mm.

The

outer cases

12F and 12B have a waist portion corresponding to the waist region T and extending in the front-rear direction. In this embodiment, the rear side outer package 12B is longer in the front-rear direction than the front side outer package 12F, and the front side outer package 12F does not have a portion corresponding to the intermediate region L, but the rear side outer package 12B has a hip cover portion C extending from the waist region T toward the intermediate region L. Although not shown, a groin cover portion extending from the waist region T toward the middle region L may be provided on the front side outer cover 12F, a groin cover portion may be provided but no hip cover portion may be provided, or a portion corresponding to the middle region L may not be provided on both the front side outer cover 12F and the rear side outer cover 12B. In the illustrated embodiment, the lower edge of the hip cover portion C is formed in a straight line along the width direction WD, similarly to the lower edge of the front outer body 12F, but may be curved toward the waist opening side as it goes toward the outer side in the width direction.

The front-rear direction dimension of the side edges of the hip cover part C can be determined as appropriate, but if it is too long, the corners of the side edges on the leg opening LO side may be swung to deteriorate the appearance and wearing feeling, and therefore, it is preferably 20mm or less.

As shown in fig. 4 to 5(B), the

outer cases

12F and 12B are formed by joining an outer sheet layer 12S and an inner sheet layer 12H, which are located outside and inside the elastic members 15 to 19, which will be described later, by joining means such as hot melt adhesive or fusion bonding. The sheet forming the outer sheet layer 12S and the sheet forming the inner sheet layer 12H may be a common sheet or may be separate sheets. That is, in the former case, the inner sheet layer 12H and the outer sheet layer 12S are formed by an inner portion and an outer portion of one sheet folded back at the edge of the waist opening WO (or at the edge on the crotch side) in a part or the whole of the outer body. In the former system, there is an advantage that the number of sheets is small, and in the latter system, there is an advantage that positional displacement is less likely to occur when the inner sheet layer 12H and the outer sheet layer 12S are bonded. The illustrated embodiment corresponds to the latter, in which the sheet forming the inner sheet layer 12H extends only to the edge of the waist opening WO, but the sheet forming the outer sheet layer 12S is folded back to the inside thereof after passing around the waist-side edge of the sheet of the inner sheet layer 12H, and the folded-back portion 12r extends so as to wrap the waist-side end portion of the interior body 200.

The sheet used for the outer sheet layer 12S and the inner sheet layer 12H may be used without particular limitation, but a nonwoven fabric is preferable, and for example, a nonwoven fabric composed of olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, or mixed fibers or composite fibers using two or more of these fibers may be used. Further, the nonwoven fabric may be produced by any process. Examples of the processing method include a spunlace method, a spunbond method, a hot-rolling method, a melt-blowing method, a needle-punching method, a hot-air method, and a point-bonding method. When a nonwoven fabric is used, the weight per unit area is preferably about 10 to 30g/m²。

The total weight of the

outer cases

12F and 12B is preferably about 20 to 60g/m²。

(expansion region and non-expansion region)

In the

outer cases

12F and 12B, elastic members 15 to 19 are provided between the outer sheet layer 12S and the inner sheet layer 12H in order to improve the fit around the waist of the wearer, and stretchable regions a2 that stretch in the width direction WD with the stretching of the elastic members are formed. In the stretch region a2, the outer sheet layer 12S and the inner sheet layer 12H contract with contraction of the elastic member in a naturally long state, and wrinkles or folds are formed, and when the outer sheet layer 12S and the inner sheet layer 12H are stretched in the longitudinal direction of the elastic member, they can be stretched to a predetermined elongation as follows: ultimate elongation without wrinkling. As the elastic members 15 to 19, in addition to a long and thin elastic member (illustrated example) such as a rubber thread, a known elastic member such as a belt, a net, or a film may be used without particular limitation. As the elastic members 15 to 19, synthetic rubber or natural rubber may be used.

The

outer sheets

12F and 12B are bonded to each other or the elastic members 15 to 19 are fixed to each other by being sandwiched between the outer sheet 12S and the inner sheet 12H, and at least one of a hot-melt adhesive by various coating methods and a fixing means by material fusion such as heat sealing or ultrasonic sealing can be used. Since flexibility is impaired when the entire surfaces of the

exterior bodies

12F and 12B are firmly fixed, it is preferable that the parts other than the bonded parts of the elastic members 15 to 19 are not bonded or weakly bonded. In the illustrated embodiment, the structure is as follows: the elastic members 15 to 19 are fixed to the two

sheet layers

12S and 12H and the two

sheet layers

12S and 12H are fixed to each other only by the hot-melt adhesive applied to the outer peripheral surfaces of the elastic members 15 to 19 by applying the hot-melt adhesive only to the outer peripheral surfaces of the elastic members 15 to 19 by applying means such as a coating gun or a glue nozzle and sandwiching the adhesive between the two

sheet layers

12S and 12H. The elastic members 15 to 19 may be fixed to the outer sheet 12S and the inner sheet 12H only at both ends in the stretching direction in the stretching region.

To explain the elastic members 15 to 19 in the illustrated embodiment in more detail, the plurality of waist elastic members 17 are attached between the outer sheet 12S and the inner sheet 12H at the waist portion W of the

outer bodies

12F, 12B with intervals in the front-rear direction so as to be continuous over the entire width direction WD. Further, 1 or more of the waist elastic members 17 disposed in the region adjacent to the waist lower portion U may overlap the interior body 200, or may be disposed on both sides in the width direction thereof excluding the center in the width direction overlapping the interior body 200. The waist elastic member 17 is preferably provided with about 3 to 22 elastic members having a thickness of 155 to 1880dtex, more preferably about 470 to 1240dtex (in the case of synthetic rubber, in the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm) at intervals of 4 to 12mm²Particularly preferably about 0.1 to 1.0mm²) The elongation of the waist portion W in the width direction WD based on the arrangement of (1) is preferably 150 to 400%, and particularly preferably about 220 to 320%. In addition, it is not necessary to use waist elastic members 17 having the same thickness or the same elongation in both the front and rear directions LD of the waist portion W, and the elastic members 17 may have different thicknesses or elongations in, for example, the upper and lower portions of the waist portion W.

A plurality of waist lower

elastic members

15 and 19 made of an elongated elastic member are attached between the outer sheet 12S and the inner sheet 12H at the waist lower portion U of the

outer cases

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

The

elastic members

15, 19 in the lower waist region are preferably provided at intervals of 1 to 15mm, more preferably 3 to 8mm, of about 5 to 30 pieces having a thickness of 155 to 1880dtex, more preferably about 470 to 1240dtex (in the case of synthetic rubber, in the case of natural rubber, the cross-sectional area is 0.05 to 1.5mm²Particularly preferably about 0.1 to 1.0mm²) The elongation of the waist lower portion U in the width direction WD based on the arrangement of (1) is preferably 200 to 350%, and particularly preferably about 240 to 300%.

Cover elastic members 16 made of elongated elastic members are attached between the outer sheet 12S and the inner sheet 12H in the hip cover portion C of the rear outer package 12B.

The cover elastic member 16 is preferably provided with 1 or a plurality of elastic members having a thickness of 155 to 1880dtex (in the case of synthetic rubber, a cross-sectional area of 0.05 to 1.5mm in the case of natural rubber, approximately 470 to 1240 dtex) at intervals in the front-rear direction²Particularly preferably about 0.1 to 1.0mm²) The elongation percentage of the hip cover part C in the width direction WD based on the rubber thread of (1) is preferably 150 to 300%, and particularly preferably 180 to 260%.

In the case where the hood elastic member 16 is provided, if the front-rear direction interval between the hood elastic member 16 closest to the leg opening LO side and the edge Ce of the hip hood C on the leg opening side is 0.9 to 1.1 times the width direction dimension W3 from the side edge of the rear outer body 12B to the side edge of the side edge 12A on the width direction center side in the hip hood C, the angle of the side edge Cs of the hip hood C on the leg opening LO side is hardly noticeable, which is preferable. In particular, in this case, it is preferable to provide 1 cover part

elastic member

16 or 2 cover part elastic members 16 at intervals of 5mm or less in the front-rear direction LD. Further, if the interval in the front-rear direction from the cover elastic member 16 located most on the lumbar side to the lumbar lower elastic member 15 adjacent to the lumbar side is 15mm or more and the interval between all the elastic members in the rear side exterior body 12B is largest, the portion of the rear side exterior body 12B located on the lumbar side with respect to the cover elastic member 16 is visually expanded more than the portion located on the leg opening side with respect to the cover elastic member 16, and thus the protrusion of the corner on the leg opening LO side of the side edge Cs of the hip cover portion C is less noticeable, which is preferable.

Here, if the cover portion elastic members 16 are arranged only on the leg opening LO side in the hip cover portion C, as shown in fig. 22(a), when the hip cover portion C contracts together with the cover portion elastic members 16, the leg opening LO side of the hip cover portion C is pulled toward the width direction WD center side, and therefore, even if the edge Ce on the leg opening LO side of the hip cover portion C is linear along the width direction WD, the edge Ce on the leg opening LO side of the hip cover portion C is inclined obliquely downward toward the width direction WD center side, and fit to the hip sulcus (hip channels) is improved. At this time, since the side edges Cs of the hip cover portions C are also inclined obliquely downward toward the center side in the width direction WD, the corners of the side edges Cs of the hip cover portions C on the leg opening LO side are not conspicuous, and the appearance is not deteriorated.

On the other hand, in the case where the cover elastic member 16 is disposed only on the waist side in the hip cover portion C, as shown in fig. 22(b), when the hip cover portion C contracts together with the cover elastic member 16, the waist side of the hip cover portion C is pulled toward the width direction center side, and therefore, even if the edge Ce on the leg opening LO side of the hip cover portion C is linear along the width direction WD, the side edge Cs of the hip cover portion C is warped laterally, and the edge Ce on the leg opening LO side of the hip cover portion C is inclined obliquely downward toward the width direction center side, so that the fit to the hip sulcus is improved. At this time, the side edges Cs of the hip cover portions C are warped sideways, but the corners of the side edges Cs of the hip cover portions C on the leg opening LO side do not protrude greatly sideways from the side seal portion 12A, so the corners of the side edges Cs of the hip cover portions C on the leg opening LO side are inconspicuous, and the appearance is not deteriorated.

In addition, when the dimension in the front-rear direction of the side edges Cs of the hip cover portions C is 0.9 to 1.1 times the width direction dimension W3 from the side edges of the rear outer body 12B to the side edges of the side seals 12A on the center side in the width direction WD, the cover portion elastic members 16 of the hip cover portions C may not be provided. In this case, the side edges Cs of the hip cover portions C are likely to be warped laterally due to the effect of contraction of the waist lower portion by the waist lower portion elastic member 15, but the corners of the side edges Cs of the hip cover portions C on the leg opening LO side hardly protrude from the side edges of the diaper, and therefore the corners are inconspicuous and the appearance is not deteriorated.

When the groin cover portion is provided on the front side outer package 12F, the cover portion elastic member may be provided in the same manner.

In the case where the

elastic members

15, 16, and 19 are provided in the longitudinal direction range including the absorbent body 56 as in the illustrated waist lower portion U or the hip cover portion C, the width direction middle portion (preferably including the whole of the inner and outer joint portions 201 and 202) including part or all of the portion overlapping the absorbent body 56 in the width direction WD is set as the non-stretchable region a1 and both sides in the width direction are set as the stretchable regions a2 in order to prevent the absorbent body 56 from shrinking in the width direction WD in part or all of the elastic members. The entire waist portion W in the width direction WD is preferably set as the stretchable region a2, but a non-stretchable region a1 may be provided at the middle in the width direction as in the waist lower portion U.

Such a stretch region a2 and a non-stretch region a1 may be formed by: the elastic members 15 to 17, 19 are supplied between the inner sheet 12H and the outer sheet 12S, the

elastic members

15, 16, 19 are fixed by a hot melt adhesive at least at both ends in the stretching direction in the stretching region A2, the

elastic members

15, 16, 19 are not fixed in the region that becomes the non-stretching region A1, and the

elastic members

15, 16, 19 are cut by pressing and heating at a position in the middle in the width direction or almost the entire

elastic members

15, 16, 19 are finely cut by pressing and heating in the region that becomes the non-stretching region A1, thereby maintaining the stretchability in the stretching region A2 and eliminating the stretchability in the non-stretching region A1. In the former case, as shown in fig. 4, in the non-stretch region a1, the remaining portions after cutting continuous with the

elastic members

15, 16, 19 of the stretch region a2 remain between the outer sheet layer 12S and the inner sheet layer 12H as the extra elastic members 18 in a state of being individually contracted to a natural length, and in the latter case, although not shown, the remaining portions after cutting continuous with the

elastic members

15, 16, 19 of the stretch region a2 and the cut pieces of the elastic members not continuous with the

elastic members

15, 16, 19 of both the stretch regions a2 remain between the outer sheet layer 12S and the inner sheet layer 12H as the extra elastic members in a state of being individually contracted to a natural length.

(display sheet)

Preferably, as shown in fig. 2, 5(a), 5(B), 7 and 8, a display sheet 25 having a display 27 such as a comic is interposed between at least one of the front side exterior body 12F and the rear side exterior body 12B and the interior body 200, and the display of the display sheet 25 is seen through the

exterior bodies

12F and 12B. In the case where the display sheet 25 is interposed between the

exterior bodies

12F and 12B and the interior body 200, the

elastic members

15, 16, and 19 for forming the non-stretchable region a1 can be cut without the display sheet 25 during the manufacturing process, so that the display sheet 25 is not left with any cutting marks, and the deterioration of the appearance can be prevented. Of course, the display sheet 25 may be interposed between the outer sheet layer 12S and the

elastic members

15, 16, and 19, or between the inner sheet layer 12H and the

elastic members

15, 16, and 19. The display sheet 25 may be omitted.

As a material of the display sheet 25, a resin film is used in order to be suitable for high-definition printing. In the case of using a resin film having high opacity, it is necessary to provide a printed portion on the outer surface of the display sheet 25, but for example, in the case of using a resin film having high transparency, a printed portion may be provided on the inner surface of the display sheet 25.

The display 27 attached to the display sheet 25 is not particularly limited, and a pattern for decoration (a character including a drawing and a single-dot pattern), a functional display such as a use method, a use aid, a size, or a logo display such as a manufacturer, a product name, or a feature function may be attached by printing or the like.

At least one of the inner surface and the outer surface of the display sheet 25 is bonded to the opposite surface with a hot-melt adhesive 25H.

The size of the display sheet 25 may be appropriately determined, but in a normal case, it is preferable that the display sheet 25 is provided in a width direction overlapping with the interior body 200 in a size equal to or smaller than the width of the interior body 200, specifically, if it is 50 to 100% of the width of the interior body 200, it is easy to attach the display sheet to the interior body 200 side at the time of manufacturing, and thus it is preferable. The width 25x of the display sheet 25 is preferably larger than the width 13x of the hood nonwoven fabric 13 described later.

The display sheet 25 may be disposed in the region overlapping the interior body 200 as in the display sheet 25 disposed in the back portion B shown in the drawing, but if at least one display sheet 25 is made of a liquid-impermeable resin film and extends from the region overlapping the interior body 200 into the waist extension portion 12E extending toward the waist opening WO side from the edge on the waist side of the interior body 200 as in the display sheet 25 disposed in the front portion F shown in the drawing, urine or loose stools leaking toward the waist side from the end portion on the waist side of the interior body 200 can be blocked by the display sheet 25, and thus urine or loose stools can be prevented from leaking out at the waist extension portion 12E of the front side exterior body 12F. Unlike the illustrated embodiment, the display sheet 25 disposed in the back portion B may extend from the region overlapping with the interior body 200 into the waist extension portion 12E together with the display sheet 25 of the front portion F or in place of the display sheet 25 of the front portion F. As the liquid-impermeable resin film, the same material as the liquid-impermeable sheet 11 can be selected, and a plastic film particularly having moisture permeability is preferably used as the liquid-impermeable sheet 11.

In the case where the display sheet 25 is extended into the waist extension portion 12E, it is more preferable that an elastic member that contracts at least the widthwise range corresponding to the widthwise middle portion of the display sheet 25 is provided at a position of the waist extension portion 12E that is apart from the edge of the interior body 200 on the waist side toward the waist opening WO side by 5mm or more. In the illustrated embodiment, the waist elastic member 17 corresponds to the elastic member of this arrangement. Since the regions where the

exterior bodies

12F and 12B overlap the interior body 200 are hard to bend due to high rigidity, and the waist extension portion 12E is easy to bend due to low rigidity, the display sheet 25 contracts in the width direction as it approaches the waist side by the waist elastic member 17, and the portion of the waist extension portion 12E between the elastic member and the interior body 200 is bent toward the skin side at the boundary with the interior body 200, as shown in fig. 21, whereby the portion of the waist extension portion 12E having the display sheet 25 stands up toward the skin side, forming a barrier wall for urine or loose stools. Thus, the

outer body

12F, 12B can have improved resistance to urine or loose stool at the waist extension 12E. In this case, if the waist extension 12E is formed of only the nonwoven fabric forming the outer sheet layer 12S and the inner sheet layer 12H, the difference in rigidity between the waist extension 12E and the region where the

outer bodies

12F and 12B overlap the inner body 200 is preferably increased. Further, the greater the number of sheets overlapped at the waist-side edge portion of the interior body 200, the greater the difference in rigidity, and thus it is preferable, specifically, there may be a difference in the number of sheets of 3 or more. In particular, it is preferable that at least the liquid-impermeable sheet 11 made of a plastic film is present at the waist-side edge portion of the inner body 200, and if a wrapping sheet 58 made of crepe paper is further present, the rigidity is increased. It is also preferable that the bulky intermediate sheet 40 extends to the waist-side edge of the interior body 200. In order to prevent the region where the

exterior bodies

12F and 12B overlap the interior body 200 from bending, it is also preferable to configure the region so as to coincide with the non-stretchable region a 1.

The length 25y in the front-rear direction of the portion of the display sheet 25 located in the waist extension portion 12E is not particularly limited, but is preferably 5mm or more in a normal case. Further, if the display sheet 25 extends at least to the elastic member on the side closest to the inner body 200 (in the illustrated embodiment, the waist elastic member on the side closest to the crotch portion of the waist elastic members 17), it is particularly preferable in terms of improving the leakage prevention property against urine or loose stool at the waist extension portion 12E of the

outer bodies

12F, 12B.

(nonwoven fabrics)

In the pants-type disposable diaper of the two-piece outer cover type, since the inner body 200 is exposed between the front outer body 12F and the rear outer body 12B, a hood nonwoven fabric 13 is provided, in which the hood nonwoven fabric 13 covers the back surface of the inner body 200 from between the front outer body 12F and the inner body 200 to between the rear outer body 12B and the inner body 200 so as not to expose the liquid impermeable sheet 11 on the back surface of the inner body 200.

The cover nonwoven fabric 13 may be a non-porous nonwoven fabric having no holes penetrating through the front and back surfaces, but in this embodiment, the cover nonwoven fabric is a porous nonwoven fabric having a plurality of holes 14 penetrating through the front and back surfaces at intervals, and extends in the front-back direction LD so as to have a portion located between the display sheet 25 and the liquid-impermeable sheet 11. If the cover nonwoven fabric 13 is extended between the display sheet 25 and the liquid-impermeable sheet 11 in this manner, air can be passed from the outside of the disposable diaper through the inside of the porous 14 nonwoven fabric to between the display sheet 25 and the liquid-impermeable sheet 11, and therefore, a decrease in air permeability can be prevented when a resin film is used as the material of the display sheet 25.

Although not shown, at least a perforated nonwoven fabric for improving air permeability extending from the crotch-side edge of the

outer casings

12F and 12B overlapping the display sheet 25 toward the waist opening side to between the display sheet 25 and the liquid-impermeable sheet 11 may be provided separately from the cover nonwoven fabric 13. In the case where the display sheet 25 is provided on both the front and rear sides, the cover nonwoven fabric 13 may be extended between the display sheet 25 and the liquid-impermeable sheet 11 only on one of the front outer casing 12F and the rear outer casing 12B.

The type of fibers of the perforated nonwoven fabric and the method of processing the fibers to be bonded (crosslinked) are not particularly limited, and the nonwoven fabric may be suitably selected from the same materials as the

outer cases

12F and 12B, but it is desirable to use a through-air nonwoven fabric, and in this case, the weight per unit area is preferably 20 to 40g/m²The thickness is preferably 0.3 to 1.0 mm.

The front-rear direction range of the hood nonwoven fabric 13 is not particularly limited, and may extend over the entire interior body 200 from the front end to the rear end in the front-rear direction LD as shown in fig. 2, 5(a), 5(B), and 7, or may extend from a front-rear direction intermediate position of a region where the front side exterior body 12F overlaps the interior body 200 to a front-rear direction intermediate position of a region where the rear side exterior body 12B overlaps the interior body 200 in the front-rear direction LD as shown in fig. 8. The length 25w in the front-back direction of the overlapping portion where the display sheet 25 and the hood nonwoven fabric 13 overlap is preferably 25 to 100% of the length 25y in the front-back direction of the display sheet 25. In the case of the embodiment shown in fig. 8, the length 13y in the front-rear direction of the overlapping portion where the hood nonwoven fabric 13 and the front outer casing 12F overlap and the length 13y in the front-rear direction of the overlapping portion where the hood nonwoven fabric 13 and the rear outer casing 12B overlap may be appropriately set, but may be set to about 20 to 40mm in a normal case.

The widthwise range of the cover nonwoven fabric 13 is defined as a range in which the exposed portion of the back surface of the liquid-impermeable sheet 11 can be hidden. Therefore, in the illustrated embodiment, since the liquid-impermeable sheet 11 is exposed between the base ends of the left and right side gather portions 60, the hood nonwoven fabric 13 is provided so as to cover at least the width direction range from the back side of the base end of one side gather portion 60 to the back side of the base end of the other side gather portion 60. Thus, the liquid-impermeable sheet 11 can be concealed by the hood nonwoven fabric 13 and the gather nonwoven fabric 62 of the side gather portion 60, and the holes 14 at both ends in the width direction WD of the hood nonwoven fabric 13 are not concealed by the gather nonwoven fabric 62 when viewed from the outer surface. Further, if the side edge of the cover nonwoven fabric 13 is located at the same position as the side edge of the narrowest width portion of the absorbent body 56 (full width in the case where the narrowing portion 56N is not provided, and the narrowest width portion of the narrowing portion 56N in the case where the narrowing portion 56N is provided), or at a position on the widthwise center side of this position, the cover nonwoven fabric 13 is located only at a portion where the entire cover nonwoven fabric 13 overlaps the absorbent body 56, that is, a portion where the rigidity is high and wrinkles or creases are less likely to occur, and therefore, both side portions of the cover nonwoven fabric 13 are less likely to contract in the front-rear direction LD, and it is therefore difficult to form wrinkles or crush the holes 14 at both side portions of the cover nonwoven fabric 13. Even if the gather nonwoven fabric 62 is made to cover the back side of both widthwise end portions of the hood nonwoven fabric 13, rather than making both widthwise end portions of the hood nonwoven fabric 13 cover the back side of the base end portions of the side gathers 60, the liquid-impermeable sheet 11 can be concealed by the hood nonwoven fabric 13 and the gather nonwoven fabric 62. In this case, since both side portions of the hood nonwoven fabric 13 are covered with the gather nonwoven fabric 62, there is an advantage that both side portions of the hood nonwoven fabric 13 are not easily peeled off from the liquid-impermeable sheet 11.

The hood nonwoven fabric 13 may have a region where the holes 14 are not present in a part of the front-back direction LD, but if the effect of improving air permeability is considered, it is desirable to provide the holes 14 over the entire front-back direction. On the other hand, in the case where the cover nonwoven fabric 13 has regions where the holes 14 are not present at both ends in the width direction WD, if the holes 14 are opened by a method other than punching by a cutter, as will be described later, the fibers of the peripheral portions 14e of the holes 14 are retracted outward or in the vertical direction, the peripheral portions 14e of the holes 14 are warped, and the thickness of the hole regions is made thicker than the non-hole regions, and therefore, when the material of the cover nonwoven fabric 13 is stored in a wound state, the portions of the non-hole regions are loosely wound, and wrinkles or creases may be formed in the non-hole regions of both sides. Therefore, it is desirable to form the holes 14 over the entire width direction WD as shown in the drawing. Further, by forming holes in the hood nonwoven fabric 13 in the diaper manufacturing process, it is possible to use a non-porous material and also to control the formation positions of the holes arbitrarily, but there are the following problems: since the hole forming apparatus is introduced, the entire manufacturing becomes large, and the cost and maintenance burden become large, and it is difficult to adjust the hole shape and flexibility in a high-speed production line. Therefore, it is preferable to use a material having holes formed throughout the front-rear direction and the entire width direction.

The planar shape (opening shape) of each hole 14 may be set as appropriate, and may be any shape such as a perfect circle as shown in fig. 17(c) and 17(e), an ellipse as shown in fig. 17(d), a triangle, a rectangle, a rhombus, or the like, or a star, a cloud, or the like, in addition to the long hole shape as shown in fig. 17(a) and 17 (b). The size of each hole 14 is not particularly limited, but the maximum size 14L in the front-rear direction LD is preferably 0.4 to 1.8mm, particularly preferably 0.8 to 1.3mm, and the maximum size 14W in the width direction WD is preferably 0.3 to 1.5mm, particularly preferably 0.5 to 1.0 mm. In the case where the shape of the hole 14 is a shape elongated in one direction, such as a long hole shape, an oval shape, a rectangular shape, a diamond shape, or the like, the maximum dimension in the longitudinal direction is preferably 2.5 times or less the maximum dimension in the direction perpendicular to the longitudinal direction. In addition, when the shape of the hole 14 is a shape elongated in one direction, the longitudinal direction of the hole 14 is desirably the front-rear direction LD, but may be the width direction WD or an oblique direction.

The area and area ratio of each hole 14 may be determined as appropriate, but the area is preferably about 0.2 to 2.5mm²(particularly preferably about 0.5 to 1.5 mm)²) The area ratio is preferably about 1.0 to 15.0% (particularly preferably about 5.0 to 10.0%).

The planar arrangement of the holes 14 may be determined as appropriate, but a regularly repeating planar arrangement is preferable, and may be regularly repeated, such as an oblique square lattice as shown in fig. 17(a), a hexagonal lattice as shown in fig. 17(b) (these are also referred to as a staggered pattern), a square lattice as shown in fig. 17(c), a rectangular lattice as shown in fig. 17(d), or a parallel lattice as shown in fig. 17(e) (in the illustrated case, a plurality of parallel oblique nematic groups are provided so as to intersect each other in 2 groups), or the like (including a shape in which the oblique nematic groups are inclined at an angle of less than 90 degrees with respect to the front-rear direction LD), or may be regularly repeated, such that the groups of the holes 14 (the arrangement of the group units may be regular or irregular, or may be in a pattern or character pattern, or the like).

The interval 14y in the front-rear direction and the interval 14x in the width direction of the holes 14 may be appropriately determined, but in consideration of air permeability, it is desirable to set them within a range of 0.5 to 8mm, particularly 1 to 5mm, and if the interval 14y in the front-rear direction and the interval 14x in the width direction are averaged, it is preferable to set the average value thereof within a range of 1 to 5 mm. In particular, as shown in fig. 17(d), if the shape of the hole 14 is formed to be elongated in the front-rear direction LD, and the rows of holes 14 arranged in the front-rear direction at a front-rear direction interval 14y narrower than the maximum dimension 14L of the hole 14 in the front-rear direction LD are repeated at predetermined intervals in the width direction WD, and the width direction interval 14x of the hole 14 is larger than the maximum dimension 14L of the hole 14 in the front-rear direction LD (more preferably, 3 times or more the width direction dimension 14W of the hole 14), it is preferable that the air permeability be significantly improved without impairing flexibility or bulkiness, and the sheet tensile strength in the front-rear direction important in manufacturing be not reduced.

As the cross-sectional shape of the hole 14, any of the following modes may be used: a1 st aspect in which, as shown in fig. 14(a) to 14(c), the thickness of the nonwoven fabric becomes thinner from the periphery of the hole 14 toward the edge of the hole 14, and the edge of the hole 14 is located in the middle of the nonwoven fabric in the thickness direction; a2 nd aspect in which, as shown in fig. 15(a) to 15(c), the peripheral portion 14e of the hole 14 is warped to the front side, and the warping height 14h is substantially uniform; and a 3 rd aspect in which, as shown in fig. 16(a) -16 (c), a peripheral portion 14e of the hole 14 is warped to the front side, and the peripheral portion 14e has an opposing portion with the highest warp height 14i and a portion with the lowest warp height 14j, wherein the portion with the lowest warp height 14j is an opposing portion opposing in a direction perpendicular to the opposing portion with the highest warp height 14 i. From the viewpoint of improving air permeability, the 2 nd and 3 rd embodiments in which the portion having the hole 14 is thicker than the periphery are desirable, and particularly, in the 3 rd embodiment, the gap formed by the difference between the

lift heights

14i and 14j of the peripheral portion 14e of the hole 14 contributes to improvement of air permeability, and is therefore preferable. In the

embodiments

2 and 3, the

lift heights

14g, 14h, and 14i (apparent heights in a state where no pressure is applied, as measured by an optical microscope) are preferably about 0.2 to 1.2mm, and in the embodiment 3, the highest lift height 14i is preferably about 1.1 to 1.4 times the lowest lift height 14 j.

The holes 14 may be punched holes whose edge portions are formed by the cut ends of the fibers, or may be non-punched holes (the fiber density of the peripheral portion is high) as follows: there is almost no cut end of the fiber at the edge of the hole 14, and the non-punched hole is formed by inserting a needle into the space between the fibers and expanding. The former is suitable for the above-mentioned embodiment 1, and the latter is suitable for the above-mentioned

embodiments

2 and 3. For example, if the hole 14 having a shape long in one direction is formed by inserting a needle, the fibers of the peripheral portion 14e of the hole 14 are retracted outward or in the vertical direction to tilt the peripheral portion 14e of the hole 14, and the tilt height i of the opposing portion in the longitudinal direction of the hole 14 is higher than the tilt height j of the opposing portion in the direction perpendicular to the longitudinal direction. In the above-described 2 nd and 3 rd embodiments, the fiber density of the edge portion of the hole 14 where the peripheral portion 14e is raised toward the surface may be lower than that of the peripheral portion, but it is preferably about the same or higher. In addition, it is desirable that the fibers of the peripheral portion 14e of the hole 14 are welded to each other, but may not be welded.

The inner surface and the outer surface of the hood nonwoven fabric 13 are bonded to the opposite surfaces with hot melt adhesives. The region of fixation of the hood nonwoven fabric 13 may be partially fixed, in addition to the entire front-back direction and the entire width direction of the hood nonwoven fabric 13. For example, if the both widthwise end portions of the hood nonwoven fabric 13 are not fixed, even in a state where the side portion of the absorbent body 56 has contracted to some extent due to the influence of the side gather portion 60, the hood nonwoven fabric 13 is not easily affected by the influence, and there are advantages as follows: it is difficult to form wrinkles or creases in the hood nonwoven fabric 13. The width of the non-fixed portion at both ends in the width direction of the hood nonwoven fabric 13 in this case may be appropriately determined, and may be set to 3 to 10mm, for example, and preferably 5 to 8 mm.

In the case of a hood nonwoven 13 having apertures 14, one preferred bonding structure is: as shown in fig. 18(a) to 18(d), in the bonding region of at least one of the inner surface and the outer surface of the hood nonwoven fabric 13, the hot melt adhesive 13H is not present on the center side of the peripheral edge portion 14i of the region overlapping the hole 14, and the hot melt adhesive 13H is present in a continuous sheet shape except for the peripheral edge portion 14i of the region overlapping the hole 14. Since the hot melt adhesive 13H is not present on the center side of the peripheral edge portion 14i of the region overlapping the hole 14, the air permeability is excellent. Further, such an adhesive structure is provided only on the surface opposite to the surface in contact with the skin, and the portion having such an adhesive structure is less likely to have a sticky skin feel by the hot-melt adhesive 13H, and the peripheral portion 14e of the hole 14 is reliably fixed to the opposite surface.

As a representative bonding state, the following state can be exemplified: as shown in fig. 18(a) and 18(b), the hot melt adhesive 13H is not present in the region overlapping the hole 14, and the hot melt adhesive 13H is present in a continuous surface shape except the region overlapping the hole 14; as shown in fig. 18(c) and 18(d), the hot melt adhesive 13H overflows the peripheral edge 14i of the region overlapping the hole 14, but the hot melt adhesive 13H does not exist on the center side of the peripheral edge 14i of the region overlapping the hole 14, and the hot melt adhesive 13H exists in a continuous surface shape except the peripheral edge 14i of the region overlapping the hole 14. The former state is particularly desirable, but since the peripheral edge portion 14i of the region overlapping the hole 14 is a portion close to the peripheral portion 14e of the hole 14 and the hood nonwoven fabric 13 has a certain thickness, even if the hot melt adhesive 13H is overflowed at this portion as in the latter, the hot melt adhesive 13H hardly comes into direct contact with the surface of the hood nonwoven fabric 13 opposite to the bonding surface when the surface is touched by hand at the portion where the surface is bonded only on the opposite side to the surface in contact with the skin. The width of the hot melt adhesive 13H protruding from the peripheral edge 14i of the region overlapping the hole 14 is preferably not more than half the thickness of the hood nonwoven fabric 13 and not more than about 0.5 mm. It is desirable that the hot melt adhesive 13H is not present in a portion of 80% or more of the area of the region overlapping the hole 14.

The cross-sectional shape of the holes 14 in the cover nonwoven fabric 13 is not particularly limited, but if the peripheral portions 14e of the holes 14 are formed as the warped portions warped toward the liquid-impermeable sheet 11 as described above, the hole diameter as viewed from the liquid-impermeable sheet 11 side is smaller than the hole diameter as viewed from the surface opposite to the liquid-impermeable sheet 11 side. Therefore, the hot-melt adhesive 13H is less likely to be touched when the surface opposite to the adhesive surface is touched by hand at a portion where only the surface opposite to the surface in contact with the skin is adhered. Further, since the warp portion supports the hood nonwoven fabric 13 against the opposite surface like a support column, the hood nonwoven fabric is bulkier than a non-porous nonwoven fabric having the same weight per unit area, and is more excellent in air permeability. In addition, since the bonding between the hood nonwoven fabric 13 and the liquid-impermeable sheet 11 is easily lifted in the region other than the peripheral portion 14e of the hole 14 (although the hot-melt adhesive 13H is drawn in fig. 18(a) to 18(d) so as to fill the space between the sheets without any gap, the substantial amount of application is small and a gap is easily generated), the peripheral portion 14e of the hole 14 is reliably bonded, and incomplete bonding is achieved in the other region (the substantial bonding area is small), whereby excellent flexibility and a soft feeling can be obtained.

Such a bonded structure can be produced by the following method: the hot melt adhesive is applied in a continuous surface form to the bonding surface of the perforated nonwoven fabric without using air, and is bonded to the opposite surface. The method is based on the following new findings: if the hot-melt adhesive is applied to the bonding surface of the perforated nonwoven fabric in a continuous surface without using air, an opening (hole) is opened in the center of the portion of the hot-melt adhesive overlapping the hole of the perforated nonwoven fabric by the surface tension of the hot-melt adhesive before the application to the opposite surface, and the opening is expanded to the periphery of the hole of the perforated nonwoven fabric. That is, if such a bonding method is employed, as shown by the change indicated by the arrow in fig. 19, after the hot melt adhesive 13H is applied in a continuous surface form to the perforated nonwoven fabric and before the nonwoven fabric is bonded to the target member, an opening (hole) H is opened in the center of the portion of the hot melt adhesive 13H overlapping the hole 14 of the perforated nonwoven fabric due to the surface tension of the hot melt adhesive 13H, and the opening H is expanded to the peripheral portion 14e of the hole 14 of the perforated nonwoven fabric. Therefore, after the porous nonwoven fabric is bonded to the target member, as in the examples shown in fig. 18(a) to 18(d), the hot melt adhesive 13H is not present in most of the pores 14, and the hot melt adhesive 13H does not fall off or ooze out of the pores 14 due to air, so that a sticky skin feel is less likely to occur when the face opposite to the bonding face is touched with a hand.

As a hot-melt film applicator for applying a hot-melt adhesive in a continuous surface form without using air, there can be suitably used: slot coating, in which a coating head (die) is brought into contact with the bonding surface of the perforated nonwoven fabric, and a hot-melt adhesive is extruded from a slit provided at the tip of the coating head in the CD direction (direction perpendicular to the MD direction (conveying direction of the manufacturing line)) to coat the perforated nonwoven fabric; or a non-contact slit coating method, in which a hot-melt adhesive is extruded from a slit in the CD direction provided at the end of an application head (die) in a state in which the application head is lifted from the bonding surface of the perforated nonwoven fabric, and the hot-melt adhesive is extended by a difference in the conveyance speed from the perforated nonwoven fabric, thereby applying the adhesive in an extremely thin film form.

The bonding conditions may be appropriately determined, but in order to quickly move the hot melt adhesive 13H overlapping the hole 14 to the peripheral portion 14e of the hole 14 and firmly bond the peripheral portion 14e of the hole 14, at least one of the following conditions is desirably satisfied.

Melt viscosity (temperature 140 ℃) of hot melt adhesive: 3000-2600 mpas

Melt viscosity (temperature 160 ℃) of hot melt adhesive: 1150 to 1550mpas

Temperature when the porous nonwoven fabric was coated with the hot melt adhesive: 110 to 150 DEG C

Coating amount of hot melt adhesive to perforated nonwoven fabric: 1.0 to 8.0g/m²

Open time after application of hot melt adhesive (open time): 0.1 to 1.0 second

Another preferred bonding structure in the case of the hood nonwoven fabric 13 having the holes 14 is as shown in fig. 20(a) to 20 (f): the peripheral portion 14e of the hole 14 in the cover nonwoven fabric 13 becomes a warped portion, and at least the tip end portion of the warped portion becomes a bonded portion bonded to the opposite surface (in this case, the liquid-impermeable sheet 11) by the hot-melt adhesive 13H, and the portion other than the bonded portion is not bonded. With such an adhesive structure, the surrounding portion 14e of the hole 14 can be reliably fixed to the opposite surface without impairing flexibility due to a small adhesive area. In particular, since the warp portion supports the hood nonwoven fabric 13 against the opposite surface like a support column, the hood nonwoven fabric is bulkier than a non-porous nonwoven fabric having the same weight per unit area, and is more excellent in air permeability.

As a representative bonding method, the following method can be exemplified: as shown in fig. 20(a) and 20(b), only the distal end portion of the warped portion is bonded to the opposite surface by the hot melt adhesive 13H; as shown in fig. 20(c) and 20(d), the whole of the warping portion is bonded to the opposite surface by the hot-melt adhesive 13H; as shown in fig. 20(e) and 20(f), the entire portion of the front end portion of the warping portion, which is located outside the inner portion, is bonded to the facing surface with the hot melt adhesive 13H, and the inner portion of the front end portion is not bonded. The inner peripheral surface of the hole 14 of the warped portion and the portion of the opposite surface overlapping the hole 14 are desirably free of adhesive, but may slightly protrude.

The bonding state of the warped portion is not limited to the illustrated form as long as at least the distal end portion is bonded to the opposing surface by the hot-melt adhesive 13H, and at least a part of the hole 14 in the circumferential direction may be any of the above bonding forms. For example, when the buckling portion is formed into a cylindrical shape by being continuous in the circumferential direction of the hole 14 as in the embodiments shown in fig. 15(a) to 16(c), the entire circumferential direction of the cylindrical distal end portion is preferably in the above-described bonded state, but a part may be in another bonded state or not bonded. In the case where the warped portion is formed only in a part of the circumferential direction of the hole 14, the tip end portion of the part may be in the bonded state. Further, different adhesion states may be mixed in the plurality of warping portions.

(inner and outer joint part)

The fixation of the interior body 200 to the

exterior bodies

12F, 12B may be performed by a bonding means by material fusion such as heat sealing or ultrasonic sealing, or a hot-melt adhesive. In the illustrated embodiment, the inner surfaces of the

outer bodies

12F and 12B are fixed to each other by the hot-melt adhesive applied to the back surface of the inner body 200, that is, in this case, the back surface of the liquid-impermeable sheet 11 and the root portion 65 of the side gather portion 60. In particular, if the inner and outer joining

portions

201 and 202 are provided over the region overlapping with the hood nonwoven fabric 13 and the regions on both sides in the width direction than the region, both side portions of the hood nonwoven fabric 13 can be firmly fixed, and both side portions of the hood nonwoven fabric 13 are less likely to be peeled off from the interior body 200, which is preferable.

As shown in fig. 9 and 10(a) -10 (c), the inner and outer joint portions 201 of the front side outer cover 12F are provided over both ends in the width direction on the waist side, and the width decreases stepwise or continuously toward the crotch-side edge of the front side outer cover 12F, so that non-joint portions 203 are formed at both ends in the width direction of the front side outer cover 12F on the crotch side. Thus, even in the exterior two-division type in which the crotch-side edge of the front-side exterior body 12F intersects the side edge of the interior body 200 in a straight or nearly straight shape along the width direction at a right angle or a nearly right angle, the fit of the stomach portion during sitting or walking can be improved.

The size of the non-joint portion 203 may be determined as appropriate, but in the case of infant and child use, the size of the non-joint portion 203 in the front-rear direction may be set to about 10 to 30mm, and the size of the non-joint portion 203 in the width direction may be set to about 10 to 25 mm. In addition, in the case of adult use, the dimension of the non-joined portion 203 in the front-rear direction may be set to about 10 to 30mm, and the dimension of the non-joined portion 203 in the width direction may be set to about 10 to 25 mm. The front edge (in the case of a curve, the position located most forward) of the non-joint portion 203 is preferably located at a position coinciding with the front-side half-lodging portion 68F, and particularly, a portion located on the rear side of the front-side half-lodging portion 68F is preferable.

In particular, if the elastic members in the stretchable region a2 in the waist lower portion of the front side outer covering 12F extend into the non-bonded portions 203 formed at both ends in the width direction of the crotch side of the front side outer covering 12F and the non-bonded portions 203 are also stretched elastically in the width direction, the fit of the crotch portion is further improved. Further, if the front half-tuck portion 68F is provided in a curved form as in the side gather portion 60 of the above-described first aspect, the fitting property of the crotch portion is further improved. As described above, the front half-laid portion 68F more preferably extends to the same position as the crotch-side edge of the front outer body 12F or further extends toward the front-rear direction center side. In addition, in the case where the absorbent body 56 is formed in an hourglass shape, if the front half-laid portions 68F are positioned on the absorbent body so as not to overlap the narrowed portions 56N, the roots of the three-dimensional gather portions are stabilized, and the front half-laid portions 68F easily rise, which is preferable.

On the other hand, if the inner and outer joint portions 202 of the rear side exterior body 12B are provided over the entire front-rear direction and over both ends in the width direction, the interior body 200 is less likely to sink into the gluteal groove, which is preferable. In this case, if the rear half-folded portion 68B is provided in a curved form as in the side gather portion 60 of the above-described first aspect, the distal end side portion 60A of the three-dimensional gather portion is inclined toward the gluteal fold and is not likely to fall in the opposite direction, which is preferable. As described above, if the rear half-lap portion 68B extends to the same position as the front edge of the rear outer body 12B or further extends toward the center side in the front-rear direction LD, the sink-in prevention property for preventing the inner body 200 from sinking into the gluteal cleft is further improved, and when the hip cover portions C are provided, the hip cover portions C are less likely to shift, and the retention property of the hip wrap is excellent. More preferably, the rear half-lodging portion 68B has a longer length in the front-rear direction than the rear lodging portion 67. In addition, in the case where the absorbent body 56 is formed in an hourglass shape, it is preferable that the inner body 200 is particularly unlikely to sink into the gluteal cleft if the rear half-laid portion 68B is positioned on the absorbent body so as not to overlap the constricted portion 56N.

In the case of adopting the curved form such as the side gather 60 of the first aspect 1, if both the front half-folded portion 68F and the rear half-folded portion 68B are provided and the ratio of the length of the rear half-folded portion 68B to the length of the front half-folded portion 68F is in the range of 0.9 to 1.5, the three-dimensional gather can rise high over a long range in the front-rear direction, and the distal end side portion 60A and the proximal end side portion 60B do not excessively become free, respectively, so the fit around the entire leg portion becomes good.

< description of words in the specification >)

Unless otherwise specified in the specification, the following terms in the specification have the following meanings.

"front-rear (longitudinal) direction" means a direction connecting the ventral side (front side) and the dorsal side (rear side), and "width direction" means a direction perpendicular to the front-rear direction (left-right direction).

"front side" means a side close to the skin of the wearer when the pants-type disposable diaper is worn, and "back side" means a side far from the skin of the wearer when the pants-type disposable diaper is worn.

"front" refers to the surface of the member that is closer to the skin of the wearer when the pants-type disposable diaper is worn, and "back" refers to the surface that is farther from the skin of the wearer when the pants-type disposable diaper is worn.

"area ratio" means a ratio of the target portion to a unit area, and is a ratio expressed by dividing the area of the target portion (e.g., hole) in the target region (e.g., nonwoven fabric) by the total area of the target portion. In the aspect in which a plurality of target portions are provided at intervals, it is desirable that: the target region is set for a size including 10 or more target portions, and the area ratio is obtained. For example, the area ratio of the holes can be measured by using a device such as that sold under the trade name VHX-1000 by KEYENCE corporation under 20-fold measurement conditions in the following order.

(1) A lens is set to 20 times, and the focal length is adjusted. The position of the nonwoven fabric was adjusted so that 4 × 6 holes were present.

(2) The luminance of the hole region was specified, and the area of the hole was measured.

(3) Click on color extraction of "area measurement" of "measurement/comment". A portion of the hole is tapped.

(4) Click on "measure together", and select "display measurement result window", save as CSV data.

"elongation" means a value at which the natural length is 100%.

"gel strength" was determined as follows. To 49.0g of artificial urine (a mixture of 2 wt% urea, 0.8 wt% sodium chloride, 0.03 wt% calcium chloride dihydrate, 0.08 wt% magnesium sulfate heptahydrate, and 97.09 wt% ion-exchanged water) was added 1.0g of a super absorbent polymer, and the mixture was stirred with a stirrer. The resultant gel was allowed to stand in a constant temperature and humidity bath at 40 ℃ X60% RH for 3 hours and then returned to normal temperature, and the gel strength was measured by a curdometer-MAX ME-500 (manufactured by I.techno Engineering Co.).

"weight per unit area" was measured as follows. The sample or test piece is preliminarily dried and then placed in a test room or apparatus in a standard state (the temperature in the test site is 20. + -. 5 ℃ and the relative humidity is 65% or less) so as to be in a constant state. The preliminary drying is to make the sample or the test piece constant in an environment with a relative humidity of 10-25% and a temperature of not more than 50 ℃. In addition, the fibers having a legal moisture content of 0.0% may not be subjected to preliminary drying. Using a template (200 mm. times.250 mm,. + -. 2mm) for sample selection, a sample having a size of 200 mm. times.250 mm (. + -. 2mm) was cut out from a test piece in a state of becoming constant. The weight of the sample was measured, and the weight per square meter was calculated as the weight per unit area by 20 times.

"thickness" Using an automatic thickness gauge (KES-G5 Portable compression measurement program) at a load of 0.098N/cm²The pressure area is 2cm²Under the conditions of (1) automatically.

The water absorption was measured in accordance with JIS K7223-1996 "method for testing the Water absorption of a super absorbent resin".

The water absorption rate is "time to end point" when JIS K7224-1996 "Water absorption Rate test method for superabsorbent resin" was carried out using 2g of a superabsorbent polymer and 50g of physiological saline.

"expanded state" refers to a state of flat expansion without contraction or relaxation.

The dimensions of the respective portions are not particularly described, but are dimensions in the expanded state rather than the natural long state.

The test or measurement is carried out in a laboratory or apparatus in a standard state (a test field at a temperature of 20 ± 5 ℃ and a relative humidity of 65% or less) without any description of environmental conditions in the test or measurement.

Industrial applicability

The present invention can be used for a pants-type disposable diaper.

Claims

1. A pants-type disposable diaper separately comprising a front-side outer covering body constituting at least a waist portion of a front body portion and a rear-side outer covering body constituting at least a waist portion of a rear body portion, the front-side outer covering body and the rear-side outer covering body being separated in a front-rear direction at a middle in the front-rear direction,

an inner body having an absorber incorporated therein extends from the front outer body to the rear outer body in the front-rear direction and is joined to the front outer body and the rear outer body, respectively,

the pants-type disposable diaper comprises a side seal part formed by joining both side parts of a front outer cover and both side parts of a rear outer cover, a waist opening, and a pair of left and right leg openings,

it is characterized in that the preparation method is characterized in that,

an inner and outer joint portion that joins the interior body and the front side exterior body together is provided on a waist side between both end portions in a width direction, a width of the inner and outer joint portion decreases stepwise or continuously toward a crotch side edge of the front side exterior body, and non-joined portions where the interior body and the front side exterior body are not joined together are provided on both end portions in the width direction of the front side exterior body on the crotch side,

the interior body is provided with a three-dimensional gather portion rising from both side portions,

the three-dimensional gather portion includes:

a body section having a root side portion extending from both side portions of a front surface of the interior body toward a widthwise central side and a distal end side portion extending from a distal end of the root side portion toward a widthwise outer side;

a recessed portion in which both front and rear end portions of the main body portion are fixed to the front surface of the interior body in a recessed state;

a floating free portion located between the front and rear lodging portions; and

a gather portion elastic member provided at least at a terminal end portion of the free portion in the front-rear direction,

the three-dimensional gather portion has a front-side half-lying portion continuous with or adjacent to a rear side of the lying portion on the front side, in which the root-side portion is joined to the front face of the inner body in a lying state, and the tip-side portion and the root-side portion are not joined together.

2. A pants-type disposable diaper according to claim 1,

the front half-collapsed portion extends to the same position as the rear edge of the front outer cover or further extends from the rear edge of the front outer cover to the front-rear direction center side.

3. A pants-type disposable diaper according to claim 1 or 2,

the leading edge of the non-engaging portion is located at a portion of the rear side of the front side half lodging portion.

4. A pants-type disposable diaper according to claim 1 or 2,

the absorbent body has a narrowed portion at a middle portion in the front-rear direction, the narrowed portion having a width smaller than widths of front and rear sides of the narrowed portion,

the front half-laid portion is located on the absorbent body so as not to overlap the narrowed portion.

5. A pants-type disposable diaper according to claim 1 or 2,

the three-dimensional gather portion has a rear-side half-lying portion continuous with or adjacent to a front side of the lying portion on a rear side, in which the tip-side portion is joined to the root-side portion in a lying state, and the root-side portion and the front face of the inner body are not joined together.

6. A pants-type disposable diaper according to claim 1,

an elastic member that elastically expands and contracts in the width direction is provided in the non-engagement portion on the front-side exterior body.