TWI744396B - Shorts type disposable diapers - Google Patents

Abstract

The problem to be solved by the present invention is to provide a shorts-type disposable diaper which simultaneously realizes the improvement of the fit of the three-dimensional wrinkles in the two-parted shorts-type disposable diaper and the three-dimensional wrinkles on both sides of the gluteal groove Prevention of dumping, etc. The above problem is solved by the following solution. A shorts-type disposable diaper in which side gathers (60) standing up from both sides of an inner body (200) are provided with: a main body (66) having roots Side part (60B) and end side part (60A); Lodging part (67), which is the part where the front and back ends of the main body part (66) are fixed on the front surface of the inner body in the down state; not fixed The free part (68) of, which is located between the front and rear lodging parts; the corrugated elastic member (63), which is arranged at least the end portion of the free part (68) along the front and back direction; and, the rear half-lodging part ( 68B), which is continuous or adjacent to the front side of the posterior lodging portion (67), and in the posterior semi-lodging portion (68B), the end side portion (60A) is joined to the root side portion (60B) in the lodging state , And the root part (60B) and the top sheet (30) are not joined together.

Description

Shorts type disposable diapers

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

Generally speaking, a shorts-type disposable diaper has: an outer body, which separately or integrally constitutes the front body and the back body; and an inner body including an absorbent body, which is installed on the outer body in a manner that extends from the front body to the back body , The side edges of the exterior body of the front body and the side edges of the exterior body of the back body are joined together to form a side seal, thereby forming a waist opening and a pair of left and right leg openings.

In such a shorts-type disposable diaper, in order to improve the fit with respect to the body, the exterior body is formed into a laminated structure having a plurality of sheets, and various elastic members are installed between the sheets in an extended state. Among them, the following structure has a relatively high fit with respect to the body: in the waist area defined as the front-to-rear range corresponding to the side seal portion, or the intermediate area between the front and rear waist areas, it is separated in the front-to-rear direction An elongated elastic member extending in the width direction is attached at intervals and each extending in the width direction (for example, refer to Patent Documents 1 to 6).

As one form of shorts-type disposable diapers, the following shorts-type disposable diapers are known, which are provided with an exterior body in which both sides of the front exterior body and both sides of the rear exterior body are on the side The seals are joined together to form a cylindrical shape; and the inner body for absorbing excrement, which is arranged from the inner surface of the front outer body to the inner surface of the rear outer body, the front outer body and the rear outer body The body is discontinuous on the crotch side and is separated in the front-rear direction (for example, refer to Patent Documents 2 to 6). Such an exterior two-part diaper has the advantage that in order to form the leg openings, the exterior body does not need to be cut off, or even if the exterior body is cut off, the cutout can be performed in a small area. That is, there is an advantage that since the cut-off piece (scrap) is discarded, it is possible to suppress the waste of its material (scrap wastage).

In the shorts-type disposable diaper of the outer two-part split type, the inner body has a long distance from the position corresponding to the lower crotch to the crossing position where the outer body intersects. Therefore, the inner body It is easy to swing left and right with the crossing position as a fulcrum, and therefore, the inner body is easier to move laterally compared with a type having an integral outer body continuous from the front body to the back body. In addition, in the shorts-type disposable diaper of the outer two-part split type, the edge between the crotch side of the outer body is a linear or nearly linear shape along the width direction, and is at a right angle or an angle close to the right angle to the inner The side edges of the body cross. This means that in a shorts-type disposable diaper with a two-part exterior, the fit around the legs is often insufficient.

Therefore, it is preferable for the shorts-type disposable diaper of the outer two-part split type as the three-dimensional pleats rising from the both sides of the inner body to the front side, with the root side part facing the center side in the width direction. The three-dimensional pleats in the curved form that stand up diagonally and make the part closer to the end side than the middle part stand obliquely outward in the width direction, even in the vicinity of the intersection where the inner body and the outer body intersect. The wrinkles are raised three-dimensionally to improve the fit around the legs.

However, in the shorts-type disposable diaper of the outer two-part split type, in the case of the curved three-dimensional pleats, the inner body easily moves laterally, which is not improved. Therefore, the three-dimensional pleats are located at the two hip grooves. Due to the inclination toward the gluteal sulcus, the lateral parts may fall in opposite directions, that is, to the gluteal sulcus side. In such a state, the inner body may easily sink into the gluteal sulcus, and the coverage of the buttocks may become insufficient, which is not preferable.

[Prior Art Document] (Patent Document) Patent Document 1: Japanese Patent Application Publication No. 2004-073428 Patent Document 2: Japanese Patent Application Publication No. 2006-525857 Patent Document 3: Japanese Patent Application Publication No. 2011-147516 Patent Document 4: Japan Japanese Patent Application Publication No. 2014-028308 Patent Document 5: Japanese Patent No. 4964993 Patent Document 6: Japanese Patent Application Publication No. 2015-092947

[Problems to be Solved by the Invention] Therefore, the main subject of the present invention is to simultaneously realize the improvement of the fit of the three-dimensional wrinkles in the two-split shorts-type disposable diaper and the three-dimensional wrinkles on both sides of the gluteal sulcus. Prevention of dumping, etc.

[Technical Means for Solving the Problems] Representative aspects of the present invention that have solved the above-mentioned problems are as follows. <First aspect> A shorts-type disposable diaper including a front exterior body that constitutes at least the waist portion of the front body and a rear exterior body that constitutes at least the waist portion of the back body, the front exterior body and The rear exterior body is separated in the front and rear direction at the middle of the front and rear direction, and the interior body containing the absorbent body extends from the front exterior body to the rear exterior body in the front and rear direction, and is respectively joined to the interior body The front exterior body and the rear exterior body, the shorts-type disposable diaper is provided with side seals formed by joining both sides of the front exterior body and both sides of the rear exterior body, respectively, A waist opening and a pair of left and right leg openings. The shorts-type disposable diaper is characterized in that the inner body is provided with three-dimensional gathers standing up from both sides, and the three-dimensional gathers have: a main body part having from Both sides of the front surface of the inner body include a root side portion extending toward the center side in the width direction and an end side portion extending from the end of the root side portion to the width direction outer side; The two ends are fixed to the front surface of the inner body in the down state; the unfixed free part is located between the front and back down parts; and the corrugated elastic member is arranged in the front and back direction. At least the end portion of the free part; the three-dimensional fold has a rear half-lodging portion, the rear half-lodging portion is continuous or adjacent to the front side of the rear side of the lodging portion, in the rear half-lodging portion The tip side portion is joined to the root side portion in a fallen state, and the root side portion and the front surface of the inner body are not joined together.

(Effects) In the first aspect, by adopting curved three-dimensional gathers in the shorts-type disposable diaper of the outer two-part split type, not only the fit of the three-dimensional gathers becomes excellent, but also the three-dimensional gathers The wrinkles are provided with the above-mentioned rear half-lodging portion. Therefore, the height of the three-dimensional wrinkles is gradually increased, and the body fitting position of the rear half-lodging portion is easily stabilized. Therefore, even if the inner body moves left and right , The body fitting position of the three-dimensional wrinkle does not swing greatly, and the end side part of the three-dimensional wrinkle is fixed so that it is difficult to fall into the gluteal groove.

<Second aspect> The shorts-type disposable diaper according to the first aspect, wherein the inner-outer joint part that joins the inner body and the rear outer body together extends over the entire front and rear direction thereof Set at both ends in the width direction.

(Effects) If the inner and outer joints that join the inner body and the rear outer body are in the shape of the second aspect, the root part of the three-dimensional folds fixed to the end part is also difficult to reach the buttocks. The direction of the sulcus is tilted, and it is more difficult for the inner body to sink into the gluteal sulcus, so it is preferable.

<3rd aspect> The shorts-type disposable diaper according to the second aspect, wherein the absorbent body has a gathered part in the middle of the front and rear direction, and the width of the gathered part is narrower than the width of the front and rear sides of the gathered part. The rear half-lodging portion extends to the same position as the front edge of the rear exterior body, or extends from the front edge of the rear exterior body further to the center side in the front and rear direction, and the rear half-lodging portion is not The overlapping manner of the folded parts is located on the absorbent body.

(Effects) The front-rear direction range of the rear half-lodging portion may be appropriately determined. However, as in the third aspect, the inner body is particularly unlikely to sink into the gluteal sulcus, which is preferable.

<Fourth aspect> The shorts-type disposable diaper according to the second aspect, wherein the rear half-lodging portion extends to the same position as the front edge of the rear exterior body, or from the front edge of the rear exterior body Further extend forward and backward toward the center side.

(Effects) The front-to-rear direction range of the rear half-lodging portion should be appropriately determined. However, if the rear half-lodging portion includes the intersection of the inner body and the outer body as in the third method, it will face The left and right movement of the inner body can also stably prevent the inner body from sinking into the gluteal groove.

<Fifth aspect> A shorts-type disposable diaper according to any one of the second to fourth aspects, wherein the front-rear dimension of the rear half-lodging portion is longer than the front-rear dimension of the rear lodging portion .

(Operation effect) If such a length relationship is satisfied, the rear half-lodging part can function particularly effectively, which is preferable.

<Sixth aspect> The shorts-type disposable diaper according to any one of the first to fifth aspects, wherein the three-dimensional gather has a front half-lodging portion, the front half-lodging portion and the front lodging portion In the front half-lodging portion, the root side portion is joined to the front surface of the inner body in a fallen state, and the end side portion and the root side portion are not joined together.

(Effects) If both the front side half-lodging portion with only the tip side portion free and the rear side half-lodging portion with only the root side free portion are provided, the three-dimensional wrinkles can stand up high over a long range in the front-to-back direction Since the tip side portion and the root side portion do not become excessively free, respectively, the fit around the entire leg becomes good.

[Effects of the Invention] As described above, according to the present invention, it is possible to simultaneously realize the improvement of the fit of the three-dimensional wrinkles and the prevention of the overturning of the three-dimensional wrinkles on both sides of the gluteal sulcus in a disposable diaper of the outer two-split shorts type. Etc.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The dotted portion in the cross-sectional view shows the adhesive as a joining means for joining the components on the front side and the back side. Curtain coating, key part coating or spiral coating, or pattern coating (transfer of hot-melt adhesive by relief printing), etc., or the fixed part of the elastic member replaces the adhesive Or it is formed by applying the adhesive to the outer peripheral surface of the elastic member using a coating gun, glue coating, or the like. As the hot-melt adhesive, there are, for example, EVA-based, adhesive rubber-based (elastic system), olefin-based, and polyester-polyamide-based adhesives, and they can be used without special restrictions. As a joining means for joining the constituent members, a means based on material welding such as heat sealing or ultrasonic sealing may also be used.

Figures 1 to 13 show an example of a shorts-type disposable diaper. This shorts-type disposable diaper includes: a front outer body 12F constituting at least the waist part of the front body F; a rear outer body 12B constituting at least the waist part of the back body B; The package body 12F is arranged on the inner side of the exterior body 12F, 12B in such a way that it extends to the rear exterior body 12B through the crotch portion, and the two sides of the front exterior body 12F and the both sides of the rear exterior body 12B are joined together. The side seal portion 12A is formed, whereby the openings formed by the front and rear ends of the exterior bodies 12F and 12B become waist openings WO through which the wearer’s waist can pass. The portions enclosed by the lower edges of 12F and 12B and the side edges of the inner body 200 respectively become leg openings LO through which the legs pass. The inner body 200 is a part that absorbs and retains excrement such as urine, and the outer bodies 12F and 12B are parts for supporting the inner body 200 with respect to the wearer's body. In addition, the symbol Y indicates the full length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X indicates the entire length of the diaper in the unfolded state. width.

The shorts-type disposable diaper of the present embodiment has a waist area T and a middle area L, and the waist area T is determined to have a front-to-rear range (a range from the waist opening WO to the upper end of the leg opening LO) in the front-rear direction having the side seal portion 12A The middle area L is determined as the front-rear direction range of the portion forming the leg opening LO (between the front-rear direction area of the front body F with the side seal portion 12A and the back body B). The waist area T can be conceptually divided into a "waist portion" W forming the edge of the waist opening, and a "waist portion" U that is a portion lower than the waist portion. Generally, when there is a boundary in the waist area T where the stretching stress in the width direction WD changes (for example, the thickness and elongation of the elastic member changes), the boundary on the waist opening WO side is closer to the waist opening WO side than the boundary on the waist opening WO side. The part becomes the waist W. If there is no such boundary, the side closer to the waist opening WO than the absorber 56 or the inner body 200 becomes the waist W. The length in the front-rear direction varies depending on the size of the product and can be appropriately determined. For example, the waist W may be 15-40 mm, and the lower waist U may be 65-120 mm. On the other hand, the edges of both sides of the middle region L are gathered in a U-shape or a curved shape along the circumference of the wearer's legs, and this place is a part for the wearer's legs to extend. As a result, the shorts-type disposable diaper in the expanded state is formed into a substantially hourglass shape as a whole.

(Interior body) The interior body 200 can take any shape, but it is rectangular in the form shown in the figure. As shown in Figures 3 to 5(b), the inner body 200 has: a top sheet 30 on the body side; a liquid-impermeable sheet 11; and, between the top sheet 30 and the liquid-impermeable sheet 11 The absorbing member 50 and the inner body 200 are a main body part that performs an absorbing function. Numeral 40 indicates an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbing member 50 in order to quickly move the liquid that has passed through the top sheet 30 to the absorbing member 50, and numeral 60 indicates that to prevent leakage of excrement into the inside. Side folds 60 extend from both sides of the body 200 from both sides of the inner body 200 so as to contact the wearer's legs.

(Top Sheet) The top sheet 30 has a property of permeating liquid, and examples thereof include porous or non-porous non-woven fabrics, porous plastic sheets, and the like. In addition, the raw material fiber of the nonwoven fabric is not particularly limited. For example, olefin-based such as polyethylene or polypropylene, synthetic fibers such as polyester-based, polyamide-based, regenerated fibers such as rayon or cupra, natural fibers such as cotton, etc., or two or more of them are used. The mixed fiber, composite fiber and so on. In addition, the non-woven fabric can be manufactured by any process. As the processing method, a known method can be exemplified, for example, a spunlace method, a spun bond method, a hot rolling method, a melt blow method, a needle punch method, a hot air method, a point bonding method, and the like. For example, if flexibility and drapability are sought, spunbonding and spunlace are the preferred processing methods, and if bulkiness and flexibility are sought, hot air, spot bonding, and hot rolling are preferred processing methods.

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

The both sides of the top sheet 30 may be folded back toward the back side at the side edge of the absorbent member 50, and may not be folded back but may protrude laterally from the side edge of the absorbent member 50.

For the top sheet 30, for the purpose of preventing positional deviation with respect to the back side member, it is desirable to fix the top sheet 30 to the top sheet 30 by a bonding means based on material welding such as heat sealing and ultrasonic sealing, or a hot melt adhesive. On the adjacent component on the back side. In the manner shown in the figure, the top sheet 30 is fixed on the front surface of the intermediate sheet 40 and the front surface of the portion located on the front side of the absorber 56 in the packaging sheet 58 by the hot melt adhesive applied on the back surface of the top sheet 30. .

(Intermediate sheet) In order to make the liquid after passing through the top sheet 30 move to the absorber quickly, an intermediate sheet (also referred to as a “second sheet”) 40 whose liquid permeation speed is faster than that of the top sheet 30 may be provided. The intermediate sheet 40 is used for the following purposes: to quickly move the liquid to the absorber to improve the absorption performance of the absorber, and to prevent the phenomenon of "backflow" of the absorbed liquid from the absorber. The intermediate piece 40 may be omitted.

As the intermediate sheet 40, the same material as the top sheet 30, or spunlace nonwoven fabric, spunbonded nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, dot-bonded nonwoven fabric, or crepe paper can be exemplified. In particular, hot-air non-woven fabrics are bulky and therefore preferred. For the hot-air nonwoven fabric, it is preferable to use a composite fiber with a core-sheath structure. In this case, the resin used for the core may be polypropylene (PP), but it is preferably high-stiffness polyester (PET). The weight per unit area is preferably 17 to 80 g/m ² , and more preferably 25 to 60 g/m ² . The thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is preferable to use eccentric fibers, hollow fibers, or eccentric and hollow fibers whose cores are not in the center as the mixed fibers of all or part of the raw fibers.

The intermediate sheet 40 of the form shown in the figure is shorter than the width of the absorber 56 and is arranged to the center, and it may be provided over the entire width. The length in the front-rear direction of the intermediate sheet 40 may be the same as the full length of the diaper, may be the same as the length of the absorbent member 50, or may be in a short length range centered on the liquid-receiving area.

For the intermediate sheet 40, for the purpose of preventing positional deviation with respect to the back side member, etc., it is desirable to fix the intermediate sheet 40 to the material by bonding means such as heat sealing and ultrasonic sealing, or hot-melt adhesives. On the adjacent component on the back side. In the form shown in the figure, the intermediate sheet 40 is fixed to the front surface of the portion located on the front side of the absorber 56 in the packaging sheet 58 by the hot-melt adhesive applied to the back surface thereof.

(Liquid-impermeable sheet) The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a plastic film made of olefin-based resins such as polyethylene or polypropylene, and a plastic film formed on the surface of a non-woven fabric can be exemplified. Laminated non-woven fabrics, laminated sheets formed by superimposing and joining non-woven fabrics on a plastic film, etc. For the liquid-impermeable sheet 11, it is preferable to use a material having liquid-impermeability and moisture permeability, which is preferably used from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by mixing an olefin resin such as polyethylene or polypropylene with an inorganic filler and forming a sheet, extending in one or two directions, is widely used. In addition, as the liquid-impermeable sheet 11, a sheet that is liquid-impermeable without using a plastic film can also be used. This kind of sheet is liquid-impermeable by the following method: Non-woven fabrics of micro denier fibers; enhanced treatment for leak-proof properties to narrow the gaps of fibers by applying heat or pressure; and, coated with super absorbent resin or hydrophobic resin or water repellent, but, in order to When the hot-melt adhesive is bonded to the cover nonwoven fabric 13 described later, sufficient bonding strength is obtained, and it is desirable to use a resin film.

In addition, the liquid-impermeable sheet 11 is formed to be stored in the width of the back side of the absorbent member 50 as shown in the figure, and in order to improve leakage resistance, it can also be wound on both sides of the absorbent member 50 and extended to the width of the absorbent member 50. Both sides of the surface on the side of the top sheet. Regarding the width of the extension, it is appropriate to be about 5 to 20 mm on the left and right sides.

In addition, an excretion indicator whose color changes due to the absorption of liquid components may be provided on the inner side of the liquid-impermeable sheet 11, particularly on the surface on the absorbent body 56 side.

(Side wrinkles) The side wrinkles 60 extend along both sides of the inner body 200 over the entire front and rear direction LD, and are provided to contact the wearer's legs to prevent side leakage. Generally speaking, , The structure called three-dimensional folds and the structure called plane folds are both included.

The side gathers 60 of the first aspect shown in FIGS. 1, 3, and 4 are so-called three-dimensional gathers, which stand up from the side of the inner body 200 toward the front side. Regarding the side gathers 60, the root side portion 60B stands up obliquely toward the center side in the width direction, and the portion 60A on the distal side than the middle portion stands obliquely toward the outside in the width direction. However, it is not limited to this, and may be as described later. As in the second aspect, the aspect of standing up to the center side in the width direction as a whole is appropriately changed.

Describing in more detail, the side gathers 60 of the first aspect are configured as follows: a belt-shaped gather nonwoven fabric 62 having a length equal to the length of the inner body 200 in the front-rear direction is placed in the width at the end portion. Fold back in the direction WD to be folded into two parts, and between the folded part and the adjacent sheet, a plurality of elongated corrugated elastic members are fixed at intervals in the width direction WD in a state of being stretched in the longitudinal direction 63. The base end portion (the end portion on the side opposite to the sheet-turned portion in the width direction WD) on the side opposite to the tip portion of the side folds 60 is fixed in the inner body 200 and is more impermeable to liquids. The root portion 65 on the side of the sex sheet 11 on the back side, and the portion other than the root portion 65 is the main body portion 66 (the portion on the turned-back portion side) protruding from the root portion 65. In addition, the main body portion 66 has a root side portion 60B that extends to the center side in the width direction, and a tip side portion 60A that is folded back at the end of the root side portion 60B and extends outward in the width direction. This method is the side gathers 60 of the surface contact type, but it is also possible to adopt the side gathers 60 of the line contact type that are not folded outward in the width direction. In addition, the front and rear end portions of the main body portion 66 are the undulating portions 67 that are fixed to the side surface of the top sheet 30 in the collapsed state. On the other hand, the front and rear middle portions between them are not fixed freely. In the portion 68, the corrugated elastic portion 63 along the front-rear direction LD is fixed to at least the end portion of the free portion 68 in an extended state. Also, the gather elastic member 63 is not fixed with respect to the gather nonwoven fabric 62 at the front and rear ends of the side gathers 60, but if fixed at least at the end to the same position as the crotch side edge of the lodging portion 67 or more than this The position close to the waist position is preferable because the three-dimensional erection becomes stable.

In the side gathers 60 of the first aspect configured as described above, the shrinking force of the gather elastic member 63 acts to bring the front and rear ends close to each other, but the front and rear ends of the main body 66 do not stand up. The way of raising is fixed. On the other hand, an unfixed free part 68 is formed between the two ends. Therefore, as shown in FIG. 3, only the free part 68 stands up so as to abut against the body side. In particular, if the root portion 65 is located on the back side of the inner body 200, the free portion 68 rises at the crotch portion and its vicinity so as to splay outward in the width direction, so the side folds 60 will abut on the surface. Around the legs to improve fit.

In the side gathers 60 of the first aspect, the main body portion 66 is formed from a root side portion 60B extending to the center side in the width direction, and a tip side portion that is folded back at the end of the root side portion 60B and extends outward in the width direction. In the curved configuration constituted by 60A, at the lodging portion 67, the tip side portion 60A and the root side portion 60B are joined together in the lodging state, and the root side portion 60B is joined to the top sheet 30 in the lodging state. For the joining of the facing surfaces in the lodging portion 67, at least one of hot-melt adhesives based on various coating methods, and means based on material welding such as heat sealing and ultrasonic sealing can be used. In this case, the joining of the root-side portion 60B and the top sheet 30 and the joining of the distal-side portion 60A and the root-side portion 60B may be performed by the same means, or may be performed by different means. For example, a preferred method is to join the root side portion 60B and the top sheet 30 by a hot melt adhesive, and join the end side portion 60A and the root side portion 60B by material welding.

Particularly, for a shorts-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 as shown in FIG. 10(a)-FIG. 10 As shown in (c), a front half-lodging portion 68F is provided continuously or adjacently to the rear side of the front-side lodging portion 67. In the front half-lodging portion, the root side portion 60B is joined to the top sheet 30 in a lodging state, And the tip side part 60A and the root side part 60B are not joined together. In the front half-lodging portion 68F, only the end portion 60A is free. Although the height is low, the end portion is reliably raised with respect to the top sheet 30 due to the contraction of the corrugated elastic member 63. Therefore, even for For the groin area where gaps are likely to occur, the fit of the side wrinkles 60 also becomes good, and the lower height makes the body fit position stable. Therefore, even if the inner body 200 moves left and right, the side wrinkles The body fitting position of the pleat 60 will not swing greatly either. In addition, in this case, if the front side half-recessed portion 68F extends to the same position as the rear edge of the front side exterior body 12F or further extends to the center side in the front and rear direction (that is, the front side half-recessed portion 68F includes the front side exterior body 12F and The cross position of the inner body 200), the stability of the inner body 200 against left and right movement and the fit of the side gathers 60 to the groin are both good, which is preferable. Under normal circumstances, it is preferable that the front-rear direction length of the front-side lodging portion 67 is approximately 0.10 to 0.25 times the front-rear direction length of the inner body 200, and the front-side half-lodging portion 68F is added to the front-rear direction length. The size of the inner body 200 is approximately 0.15 to 0.30 times the length in the front-rear direction. 10 (a)-10 (c) in FIG. 10 (a)-FIG. 10 (c) the label AF indicates that the tip side portion 60A and the root side portion 60B are joined together, the symbol BF indicates that the root side portion 60B and the top sheet 30 Hot melt adhesive to join together.

In addition, if as shown in Figure 11 (a)-Figure 11 (c) and the front side of the rear side of the lodging portion 67 is provided consecutively or adjacent to the front side of the rear side half-lodging portion 68B, wherein, the rear side half-lodging portion 68B In 68B, the tip side portion 60A is joined to the root side portion 60B in the fallen state, and the root side portion 60B and the top sheet 30 are not joined together, the tip side portion 60A of the three-dimensional wrinkles is facing the gluteal groove due to the following factors (Gluteal cleft) is not easy to fall in the opposite direction, so it is preferable. The factors are: only the root side portion 60B is free and the tip side portion 60A is fixed; and, the height stage of the side folds 60 The body fitting position of the rear half-lodging portion 68B tends to become stable due to the increase in nature. Therefore, even if the inner body 200 moves left and right, the body fitting position of the side gathers 60 does not swing greatly. Since the rear half-lodging portion 68B is in contact with the swollen portion of the buttocks, even if the tip side portion 60A is fixed, there is no need to worry about creating a gap between it and the body. In addition, in this case, if the rear half-lodging portion 68B extends to the same position as the front edge of the rear exterior body 12B or further extends to the center side in the front and rear direction (that is, the rear half-lodging portion 68B includes the rear outer The crossing position of the inner body 12B and the inner body 200) can stably prevent the inner body 200 from sinking into the gluteal groove even when facing the left and right movement of the inner body 200, which is preferable. Moreover, in this case, it is preferable that the length of the rear half-lodging portion 68B in the front-rear direction is longer than the length of the rear lodging portion 67 in the front-rear direction. Normally, it is preferable that the front and rear side of the rear lodging portion 67 The length in the direction is about 0.15 to 0.30 times the length of the inner body 200 in the front and rear direction. On this basis, the size after adding the length of the rear half-lodging portion 68B in the front and rear direction is about 0.20 to about 0.20 to the length of the inner body 200 in the front and rear direction. 0.35 times. 11 (a)-FIG. 11 (c) in FIG. 11 (a)-FIG. 11 (c), the reference numeral AF represents the hot-melt adhesive that joins the end side portion 60A and the root side portion 60B, and the reference numeral BF represents the root side portion 60B and the top sheet 30 Hot melt adhesive to join together.

As the pleated non-woven fabric 62, non-woven fabrics that are soft and excellent in uniformity and concealment such as spunbonded non-woven fabrics (SS, SSS, etc.), SMS non-woven fabrics (SMS, SSMMS, etc.), melt-blown non-woven fabrics, etc., can be suitably used as needed. It is preferable that the weight per unit area of the fiber of the corrugated non-woven fabric subjected to the water repellent treatment is about 10 to 30 g/m ² . As the corrugated elastic member 63, a rubber thread or the like can be used. In the case of using a spandex rubber thread, the thickness is preferably 470 to 1240 dtex, and more preferably 620 to 940 dtex. The elongation at the time of fixation is preferably 150 to 350%, and more preferably 200 to 300%. In addition, the term "elongation" indicates a value when the natural length is 100%. In addition, as shown in the figure, a waterproof membrane 64 may be interposed between the corrugated nonwoven fabric 62 folded into two parts. In this case, the corrugated nonwoven fabric 62 may be partially omitted at the portion where the waterproof membrane 64 is present. However, in order to form the appearance and skin feel of a product like a cloth, it is necessary to form at least the outer surface of the side gathers 60 from the base end to the end with the gather non-woven fabric 62 as shown in the figure.

The number of gather elastic members 63 provided in the free part of the side gathers 60 is preferably 2 to 6, and more preferably 3 to 5. It is appropriate for the arrangement interval 60d to be 3 to 10 mm. With such a configuration, it is easy to contact the skin on the surface within the range where the wrinkle elastic member 63 is arranged. The corrugated elastic member 63 may be arranged not only on the tip side but also on the root side.

At the free portion 68 of the side pleats 60, for the adhesion of the inner layer and the outer layer of the corrugated nonwoven fabric 62, or the fixing of the corrugated elastic member 63 sandwiched between them, various coating methods can be used. At least one of hot-melt adhesives, and fixing means based on material fusion, such as heat sealing or ultrasonic sealing. If the inner layer and outer layer of the corrugated nonwoven fabric 62 are bonded over the entire surface, the flexibility will be impaired. Therefore, it is preferable not to adhere or weakly adhere the parts other than the adhesive portion of the corrugated elastic member 63. In the form shown in the figure, it is a structure in which a hot-melt adhesive is applied to only the outer peripheral surface of the corrugated elastic member 63 by applying means such as a coating gun or a glue nozzle, and the corrugated elastic member 63 It is sandwiched between the inner layer and the outer layer of the corrugated non-woven fabric 62, whereby only the hot-melt adhesive applied to the outer peripheral surface of the corrugated elastic member 63 is used to make the elongated elastic member relative to the corrugated non-woven fabric. Fixation of the inner layer and outer layer of 62, and fixation of the inner layer and outer layer of the corrugated non-woven fabric 62.

Similarly, for fixing the waterproof membrane 64 incorporated in the side wrinkles 60 and the wrinkle non-woven fabric 62, or fixing the lodging portion 67, hot melt adhesives based on various coating methods, and heat sealing or ultrasonic waves can be used. At least one of the means based on material welding such as sealing.

The size of the side gathers 60 of the first aspect can be appropriately determined, but in the case of infants and young children, for example, as shown in FIG. The direction length) W2 is preferably 15 to 60 mm, particularly preferably 20 to 40 mm. In addition, the separation distance W1 between the fold lines located on the innermost side in a state where the side gathers 60 are folded flatly parallel to the front surface of the top sheet 30 is preferably 60 to 190 mm, particularly preferably 70 to 140 mm. In the case of an adult use, the rising height (the width direction length of the main body portion 66 in the expanded state) W2 of the side gathers 60 is preferably 20 to 60 mm, particularly preferably 30 to 55 mm. In addition, the separation distance W1 between the fold lines located at the innermost side in a state where the side gathers 60 are folded flatly parallel to the front surface of the top sheet 30 is preferably 110 to 190 mm, particularly preferably 120 to 150 mm.

The side gathers 60 of the first aspect include only three-dimensional gathers, but may include both three-dimensional gathers and flat gathers, or only flat gathers. 12 and 13 show the side gathers 60 of the second aspect including both three-dimensional gathers and flat gathers. Each side wrinkle 60 has a first portion 61 (planar wrinkle portion) that is fixed inwardly from the root portion 65 on the side of the inner body 200 on the back side than the liquid-impermeable sheet 11 The side of the body 200 protrudes; and the second portion 69 (three-dimensional corrugated portion), which protrudes from the root portion 65 on both sides of the top sheet 30 fixed in the inner body 200 to the front side of the inner body 200 . In more detail, a belt-shaped corrugated nonwoven fabric 62 having a length equal to the length in the front-rear direction of the inner body 200 is projected laterally from the root portion 65 and folded back toward the front side at the end of the first portion 61. The portion turned back toward the front side passes through the first portion 61 to reach the second portion 69, and is turned back at the end of the second portion 69. Regarding the folded portion in the corrugated nonwoven fabric 62, the opposed portions are joined together by a hot melt adhesive or the like. In addition, the both ends of the second portion 69 in the front-rear direction are set to be the undulating portions 67 fixed to the side surface of the top sheet 30 in a fallen state. The middle part is set as a free part 68 that is not fixed. In at least the middle portion in the front-rear direction of the first portion 61 and the free portion 68 of the second portion 69, one piece is fixed in an extended state, or a plurality of wrinkles along the front-rear direction LD are fixed at intervals in the width direction WD The pleat elastic member 63, by virtue of the contraction force of the pleat elastic member, the free portion 68 of the second part 69 shrinks in the front-rear direction LD to become a three-dimensional pleat that contacts the legs. In addition, the first part 61 is in the front-rear direction The LD shrinks and becomes a flat wrinkle in contact with the periphery of the leg.

The three-dimensional wrinkles in the side gathers 60 of the second aspect are in a form that rises toward the center side in the width direction as a whole, but are not limited to this, and can be formed in a curved form like the side gathers 60 of the first aspect. Make appropriate changes. The other points related to the second aspect, such as the material of the corrugated non-woven fabric 62 or the material of the corrugated elastic member 63, are the same as those of the first aspect, and therefore the description is omitted.

(Absorbent member) The absorbent member 50 has: an absorber 56; and a packaging sheet 58 covering the entire absorber 56. The packaging sheet 58 may also be omitted.

(Absorber) The absorber 56 may be formed of an aggregate of fibers. As the fiber aggregate, in addition to the aggregate formed by piling short fibers such as cotton pulp or synthetic fibers, it is also possible to use tows (fiber bundles) of synthetic fibers such as cellulose acetate as needed. A collection of filaments obtained by spinning. The weight per unit area of the fiber may be, for example, about 100 to 300 g/m ² in the case of piling cotton-like pulp or short fibers, and in the case of filament aggregates, for example, about 30 to 120 g. /m ² . In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament assembly, the filaments may be non-crimped fibers, but are preferably crimped fibers. The degree of crimp of the crimped fiber may be, for example, 5 to 75 per 2.54 cm, preferably 10 to 50, and more preferably about 15 to 50. In addition, crimped fibers uniformly crimped are used in many cases. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

The absorber 56 may have a rectangular shape, but if it is also formed into an hourglass shape with a narrower width 56N in the middle of the front and rear direction than the front and rear sides in the middle of the front and rear direction as shown in FIGS. 1 and 7 and the like, it absorbs The body 56 itself and the side gathers 60 have improved fit with respect to the legs, and are therefore preferable.

In addition, the size of the absorber 56 may be appropriately determined as long as it covers the front, rear, left, and right of the urinary opening position, but it is preferable to extend to the peripheral edge portion of the inner body 200 or its vicinity in the front-rear direction LD and the width direction WD. In addition, reference numeral 56X indicates the full width of the absorber 56.

(Superabsorbent polymer particles) A part or all of the absorber 56 may contain superabsorbent polymer particles. With regard to superabsorbent polymer particles, "powder" is included in addition to "particles". As the superabsorbent polymer particles 54, the particles used in this disposable diaper can be used as they are. It is desirable that the proportion of particles on the sieve is 30% by weight or less. In addition, the particles remaining on the sieve during the screening (vibration for 5 minutes) using a 180 µm standard sieve (JIS Z8801-1: 2006) Particles with a proportion of 60% by weight or more are desirable.

As the material of the superabsorbent polymer particles, it can be used without particular limitation, but a material having a water absorption capacity of 40 g/g or more is preferable. As the superabsorbent polymer particles, there are superabsorbent polymer particles such as starch, cellulose, synthetic polymer, etc., starch-acrylic acid (salt) graft polymer, starch-acrylonitrile copolymer saponification product can be used , Sodium carboxymethyl cellulose cross-linked product and acrylic acid (salt) polymer and other super absorbent polymer particles. As the shape of the superabsorbent polymer particles, a generally used powder or granular shape is preferable, but other shapes may also be used.

As the superabsorbent polymer particles, it is preferable to use superabsorbent polymer particles having a water absorption speed of 70 seconds or less, particularly 40 seconds or less. If the water absorption speed is too slow, so-called backflow in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

As the superabsorbent polymer particles, it is preferable to use superabsorbent polymer particles having a gel strength of 1000 Pa or more. Thereby, even in the case of forming the bulky absorber 56, the sticky feeling after liquid absorption can be effectively suppressed.

The weight per unit area of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required by the use of the absorbent body 56. Therefore, it cannot be generalized, but it can be 50 to 350 g/m ² . If the weight per unit area of the polymer is less than 50 g/m ² , it is difficult to ensure the absorption capacity. If the weight per unit area of the polymer exceeds 350 g/m ² , the effect is saturated.

If necessary, the dispersion density or the dispersion amount of the superabsorbent polymer particles can be adjusted in the plane direction of the absorber 56. For example, it is possible to make the amount of spreading of the liquid excretion site larger than the spreading amount of other sites. In the case of considering the difference between men and women, in the case of male use, the spreading density (quantity) on the front side can be increased, and in the case of female use, the spreading density (quantity) of the central part can be increased. In addition, a portion where no polymer is present may be provided partially (for example, in a dot shape) in the planar direction of the absorber 56.

(Packaging sheet) When the packaging sheet 58 is used, as its material, tissue paper, particularly crepe paper, non-woven fabric, composite laminated non-woven fabric, sheet with small holes, etc. can be used. However, it is desired to be a sheet in which the superabsorbent polymer particles do not fall out. In the case of using non-woven fabrics instead of crepe paper, hydrophilic SMS non-woven fabrics (SMS, SSMMS, etc.) are particularly preferred, and polypropylene, polyethylene/polypropylene composite materials, etc. can be used as the material. The weight per unit area is desirably 5 to 40 g/m ² , and particularly desirably 10 to 30 g/m ² .

The packaging method of the packaging sheet 58 can be appropriately determined, but from the viewpoints of ease of manufacture and prevention of the leakage of superabsorbent polymer particles from the front and rear edges, the following method is preferable: the packaging sheet 58 surrounds the front surface of the absorber 56 The back and both sides are wound into a cylindrical shape, and the front and rear edges are exposed from the front and back of the absorber 56, and the overlapped part and the front and back are joined by joining means such as hot melt adhesive and material welding. The overlapping parts of the exposed parts are joined together.

(Exterior body) The exterior bodies 12F and 12B are not the integral exterior body 12 that is continuous from the front body F through the crotch to the back body B as shown in Figs. 23 and 24(a) and 24(b). It is an exterior body consisting of a front exterior body 12F that constitutes at least the waist portion of the front body F, and a rear exterior body 12B that constitutes at least the waist portion of the back body B, and the front exterior The body 12F and the rear exterior body 12B are discontinuous on the crotch side and are separated in the front-rear direction LD. The separation distance 12d may be about 150 to 250 mm, for example.

The exterior bodies 12F and 12B have a waist area corresponding to the waist area T, which is a range in the front-rear direction. In addition, in this aspect, the front-to-rear dimension of the rear exterior body 12B is longer than that of the front exterior body 12F, and the front exterior body 12F does not have a portion corresponding to the middle region L, but the rear exterior body 12B It has a buttocks cover C that protrudes from the waist area T to the middle area L side. Although not shown, it is also possible to provide a groin cover portion extending from the waist region T to the middle region L side on the front exterior body 12F, or a form in which the groin cover portion is provided but the buttocks cover portion is not provided, or It is not necessary to provide a portion corresponding to the intermediate region L on both the front exterior body 12F and the rear exterior body 12B. In addition, although the lower edge of the buttocks cover portion C and the lower edge of the front exterior body 12F are formed linearly along the width direction WD in the illustrated manner, it may be formed closer to the waist opening side as it goes to the width direction outside. Curve.

The front-rear dimension of the side edge of the buttocks cover C can be appropriately determined, but if it is too long, the corners of the side edge on the leg opening LO side may flutter and deteriorate the appearance and wearing comfort. Therefore, it is preferably 20 mm or less.

As shown in Figures 4 to 5(b), the exterior bodies 12F and 12B are formed by joining the outer sheet layers 12S and 12S on the outer and inner sides of the elastic members 15 to 19, which will be described later, by joining means such as hot-melt adhesive or welding. The inner sheet layers 12H are joined together. The sheet forming the outer sheet layer 12S and the sheet forming the inner sheet layer 12H may be a common sheet or separate sheets. That is, in the former case, part or all of the exterior body is formed by the inner part and outer part of a sheet folded at the edge of the waist opening WO (or at the edge of the crotch side), respectively. Sheet layer 12H and outer sheet layer 12S. In addition, the former method has an advantage that the number of sheets is small, and the latter method has an advantage that positional deviation is difficult to occur when the inner sheet layer 12H and the outer sheet layer 12S are bonded together. The method shown in the figure corresponds to the latter. The sheet forming the inner sheet layer 12H only extends to the edge of the waist opening WO, but the sheet forming the outer sheet layer 12S goes around the waist side edge of the sheet of the inner sheet layer 12H. The inner side is folded back, and the folded-back portion 12r extends so as to cover the waist end of the inner body 200.

As the sheets used for the outer sheet layer 12S and the inner sheet layer 12H, they can be used without particular limitation, but non-woven fabrics are preferable. For example, the following non-woven fabrics can be used. Synthetic fibers such as polyamide-based, polyamide-based, or mixed fibers or composite fibers using two or more of them. In addition, the non-woven fabric can be manufactured by any process. As the processing method, a known method can be exemplified, for example, by a spunlace method, a spunbond method, a hot rolling method, a melt blown method, a needle punch method, a hot air method, a point bonding method, and the like. In the case of using a non-woven fabric, its weight per unit area is preferably about 10-30 g/m ² .

In addition, the total weight per unit area of the exterior bodies 12F and 12B is preferably about 20 to 60 g/m ² .

(Stretching area and non-stretching area) In the outer body 12F, 12B, in order to improve the fit for the waist of the wearer, elastic members 15 to 19 are provided between the outer sheet layer 12S and the inner sheet layer 12H to form The expansion and contraction area A2 elastically expands and contracts in the width direction WD as the elastic member expands and contracts. In this stretch area A2, in a naturally long state, the outer sheet layer 12S and the inner sheet layer 12H shrink with the contraction of the elastic member, thereby forming wrinkles or folds. When the outer sheet layer 12S and the inner sheet layer 12H When the elastic member is stretched in the longitudinal direction, it can be stretched to a predetermined elongation rate as follows: ultimate stretch without wrinkles. As the elastic members 15 to 19, in addition to elongated elastic members (illustrated examples) such as rubber threads, well-known elastic members such as a belt shape, a mesh shape, and a film shape can also be used without particular limitation. As the elastic members 15-19, synthetic rubber may be used, or natural rubber may be used.

For the bonding of the outer sheet layer 12S and the inner sheet layer 12H in the exterior bodies 12F and 12B, or the fixing of the elastic members 15-19 sandwiched between them, hot melt adhesives based on various coating methods can be used , And at least one of fixing means based on material welding, such as heat sealing or ultrasonic sealing. If the entire surfaces of the exterior bodies 12F and 12B are firmly fixed, the flexibility will be impaired. Therefore, it is preferable not to adhere or weakly adhere the parts other than the adhesive portions of the elastic members 15 to 19. In the form shown in the figure, it is a structure in which a hot-melt adhesive is applied to only the outer peripheral surfaces of the elastic members 15-19 by coating means such as a coating gun or a glue nozzle, and the two sheets 12S, Therefore, only the hot-melt adhesive applied on the outer peripheral surface of the elastic members 15-19 is used to fix the elastic members 15-19 with respect to the two sheets 12S, 12H, and the two Fixation between the layers 12S and 12H. The elastic members 15 to 19 may be fixed to the outer sheet layer 12S and the inner sheet layer 12H only at both ends in the expansion and contraction direction in the expansion and contraction region.

The elastic members 15 to 19 shown in the figure will be described in more detail. A plurality of waist elastic members 17 are attached to the waists of the exterior bodies 12F, 12B at intervals in the front-rear direction so as to be continuous throughout the width direction WD. Between the outer sheet 12S and the inner sheet 12H at W. In addition, one or more of the waist elastic members 17 arranged in the area adjacent to the waist lower portion U may overlap with the inner body 200, or the ones that overlap with the inner body 200 may be removed. The widthwise central part is respectively provided on both sides of the widthwise direction. As the waist elastic member 17, it is preferable to provide about 3-22 pieces at an interval of 4-12mm, with a thickness of 155-1880dtex, particularly preferably about 470-1240dtex (in the case of synthetic rubber. In the case of natural rubber, cut With an area of 0.05 to 1.5 mm ² , and particularly preferably about 0.1 to 1.0 mm ² ), the elongation of the waist W in the width direction WD based on the setting is preferably 150 to 400%, particularly preferably about 220 to 320 %. In addition, for the waist W, it is not necessary to use the same thickness or the same elongation of the waist elastic member 17 in the front-rear direction LD.

In addition, between the outer sheet layer 12S and the inner sheet layer 12H at the lower waist portion U of the exterior bodies 12F and 12B, a plurality of lower waist elastic members composed of elongated elastic members are installed at intervals in the front-rear direction. 15, 19.

As the lower waist elastic members 15, 19, it is preferable to provide about 5 to 30 at intervals of 1-15 mm, particularly preferably 3-8 mm, with a thickness of 155-1880 dtex, particularly preferably about 470-1240 dtex (in the case of synthetic rubber) In the case of natural rubber, a rubber thread with a cross-sectional area of 0.05 to 1.5 mm ² , and particularly preferably about 0.1 to 1.0 mm ² ), based on this arrangement, the elongation of the lower waist portion U in the width direction WD is preferably 200 ~350%, particularly preferably about 240-300%.

In addition, between the outer sheet layer 12S and the inner sheet layer 12H in the buttocks cover portion C of the rear exterior body 12B, a cover portion elastic member 16 made of an elongated elastic member is attached.

As the cover elastic member 16, it is preferable to provide one or a plurality of them at intervals in the front-rear direction. The thickness is 155 to 1880 dtex, and is particularly preferably about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber) , A rubber thread with a cross-sectional area of 0.05 to 1.5 mm ² , and particularly preferably about 0.1 to 1.0 mm ² ). Based on this arrangement, the elongation of the buttocks cover C in the width direction WD is preferably 150 to 300%, particularly preferably 180～260%.

When the cover elastic member 16 is provided, if the cover elastic member 16 closest to the leg opening LO side and the leg opening side edge Ce of the buttocks cover C are spaced in the front-rear direction at the side edge Cs of the buttocks cover C It is 0.9 to 1.1 times the widthwise dimension W3 from the side edge of the rear exterior body 12B to the side edge of the widthwise center side of the side seal portion 12A, the leg opening LO side of the side edge Cs of the buttocks cover portion C The corners are almost inconspicuous, so it is preferred. In this case, in particular, it is suitable to provide one or two cover elastic members 16 at an interval of 5 mm or less in the front-rear direction LD. In addition, if the front-to-back interval from the cover elastic member 16 on the most waist side to the lower waist elastic member 15 adjacent to the waist side is 15 mm or more, and all the elastic members in the rear exterior body 12B In the rear exterior body 12B, the portion on the waist side of the cover elastic member 16 appears to be expanded more than the portion on the leg opening side than the cover elastic member 16 in the rear exterior body 12B. Therefore, the protrusion of the corner on the leg opening LO side of the side edge Cs of the buttocks cover C is not easy to be noticeable, and therefore it is preferable.

Here, if the cover elastic member 16 is arranged only on the leg opening LO side in the buttocks cover C, as shown in FIG. 22(a), when the buttocks cover C and the cover elastic member 16 are contracted together, the buttocks The leg opening LO side of the cover portion C is pulled toward the center side of the width direction WD. Therefore, even if the edge Ce on the leg opening LO side of the buttocks cover portion C is linear along the width direction WD, the leg opening LO of the buttocks cover portion C is The side edge Ce is also inclined obliquely downward toward the center side of the width direction WD, and the fit to the hip groove (gluteal groove) is improved. At this time, the side edge Cs of the buttocks cover C is also inclined obliquely downward toward the center side in the width direction WD, and therefore, the corners on the leg opening LO side of the side edge Cs of the buttocks cover C are not conspicuous, and the appearance does not deteriorate.

On the other hand, when the cover elastic member 16 is arranged only on the waist side in the buttocks cover C, as shown in FIG. 22(b), when the buttocks cover C is contracted together with the cover elastic member 16, as shown in FIG. The waist side of the buttocks cover C is drawn toward the center in the width direction. Therefore, even if the edge Ce on the leg opening LO side of the buttocks cover C is linear along the width direction WD, the side edge Cs of the buttocks cover C is also directed toward The side is warped, and the edge Ce on the leg opening LO side of the buttocks cover C is inclined obliquely downward toward the center in the width direction, and the fit to the buttocks groove is improved. At this time, the side edge Cs of the buttocks cover portion C is warped to the side, but the corners on the leg opening LO side of the side edge Cs of the buttocks cover portion C do not protrude significantly to the side of the side seal portion 12A, so the buttocks cover portion The corner of the leg opening LO side of the side edge Cs of C is not conspicuous, and the appearance does not deteriorate.

In addition, the front-rear dimension of the side edge Cs of the buttocks cover portion C is 0.9 to 1.1 of the widthwise dimension W3 from the side edge of the rear exterior body 12B to the side edge of the side seal portion 12A in the width direction WD center side In the case of doubling, the cover elastic member 16 of the buttocks cover C may not be provided. In this case, the side edge Cs of the buttocks cover portion C is easily warped laterally due to the effect of the lower waist portion being contracted by the lower waist portion elastic member 15, but the leg opening LO of the side edge Cs of the buttock cover portion C The corner of the side hardly protrudes from the side edge of the diaper, so the corner is not conspicuous and the appearance does not deteriorate.

When a groin cover is provided in the front exterior body 12F, a cover elastic member may be provided in the same manner.

In the case where the elastic members 15, 16, 19 are provided in the front-rear direction range of the absorber 56, as shown in the waist lower portion U or the buttocks cover portion C, in order to prevent the absorber from being partially or entirely The contraction of 56 in the width direction WD, the middle in the width direction (preferably including the entire inner and outer joints 201, 202) including a part or all of the part or all of the overlapped portion of the absorber 56 in the width direction WD is set as a non-stretching area A1, both sides in the width direction are set as expansion and contraction areas A2. It is preferable to set the waist W over the entire width direction WD as the stretchable area A2, but like the waist lower portion U, a non-stretchable area A1 may be provided in the middle of the width direction.

Such a stretchable area A2 and a non-stretchable area A1 can be formed by supplying elastic members 15-17, 19 between the inner sheet layer 12H and the outer sheet layer 12S, in the stretchable area A2 at least in the stretch direction At both ends, the elastic members 15, 16, 19 are fixed by hot-melt adhesive. In the area that becomes the non-stretching area A1, the elastic members 15, 16, 19 are not fixed, and in the area that becomes the non-stretching area A1 In the middle part in the width direction, the elastic members 15, 16, 19 are cut by pressure and heating, or almost the whole of the elastic members 15, 16, 19 is cut finely by pressure and heating, Thus, the stretchability is maintained in the stretchable area A2, while the stretchability is eliminated in the non-stretchable area A1. In the former case, as shown in FIG. 4, in the non-stretchable area A1, the elastic members 15, 16, 19 of the stretchable area A2 are continuously cut and the remaining part is separately contracted to the natural length as an extra elastic member 18 It remains between the outer sheet layer 12S and the inner sheet layer 12H in the state of the latter. In the latter case, although not shown, the remaining portion after cutting continuous with the elastic members 15, 16, 19 of the stretchable area A2, and the The cut pieces of the elastic members that are continuous with the elastic members 15, 16, and 19 of the two stretchable regions A2 remain between the outer sheet layer 12S and the inner sheet layer 12H in a state of being individually contracted to a natural length as an excess elastic member.

(Display sheet) Preferably, as shown in FIGS. 2, 5(a), 5(b), 7 and 8, at least one of the front exterior body 12F and the rear exterior body 12B is connected to A display sheet 25 having a display 27 such as a cartoon is interposed between the inner body 200, and the display of the display sheet 25 can be seen through the outer bodies 12F and 12B. If the display sheet 25 is sandwiched between the outer body 12F, 12B and the inner body 200, the elastic member for forming the non-stretching area A1 can be performed without the display sheet 25 during manufacturing. Since the cutting process of 15, 16, 19 does not leave a cutting trace on the display sheet 25, it is possible to prevent deterioration of aesthetics. Of course, the display sheet 25 may also be sandwiched between the outer sheet layer 12S and the elastic members 15, 16, 19, or between the inner sheet layer 12H and the elastic members 15, 16, 19. The display sheet 25 may be omitted.

As a material of the display sheet 25, a resin film is used from the point of being suitable for high-definition printing. In the case of using a highly opaque resin film, it is necessary to provide a printing portion on the outer surface of the display sheet 25, but for example, in the case of using a highly transparent resin film, it may also be provided on the inner surface of the display sheet 25 Printing department.

The display 27 attached to the display sheet 25 is not particularly limited. It can be added by printing and other decorative patterns (including figures in paintings and single-dot patterns), usage methods or use aids, size and other functional displays, or manufacturers Or display the product name, feature function and other identification display.

At least one of the inner surface and the outer surface of the display sheet 25 is adhered to the opposing surface by a hot-melt adhesive 25H.

The size of the display sheet 25 may be appropriately determined. However, under normal circumstances, it is preferable that the display sheet 25 be arranged within the widthwise range overlapping the inner body 200 with a size less than or equal to the width of the inner body 200 Specifically, if it is 50% to 100% of the width of the inner body 200, it is easy to stick to the inner body 200 side at the time of manufacture, which is preferable. In addition, it is preferable that the width 25x of the display sheet 25 is wider than the width 13x of the cover nonwoven fabric 13 mentioned later.

The display sheet 25 may be arranged in the area overlapping the inner body 200 like the display sheet 25 arranged on the back body B as shown, but if at least one display sheet 25 is composed of a liquid-impermeable resin film and is as shown The display sheet 25 arranged on the front body F extends from the area overlapping the inner body 200 to the waist extension portion 12E, wherein the waist extension portion 12E is closer to the waist than the edge of the waist side of the inner body 200 When the opening WO side extends, the display sheet 25 can block urine or soft stools leaking from the waist side end of the inner body 200 to the waist side, thereby preventing urine or soft stools from stretching on the waist of the front outer body 12F The part 12E oozes out. Unlike the illustration, the display sheet 25 arranged on the back body B may be extended to the waist extension from the area overlapping the inner body 200 together with the display sheet 25 of the front body F, or instead of the display sheet 25 of the front body F. Out of part 12E. As the liquid-impermeable resin film, the same material as the liquid-impermeable sheet 11 can be selected, and it is preferable to use a plastic film having particularly moisture-permeability in the same manner as the liquid-impermeable sheet 11.

In the case of extending the display sheet 25 into the waist extension portion 12E, it is more preferable that the waist extension portion 12E is at a position 5 mm or more away from the edge of the waist side of the inner body 200 toward the waist opening WO side in the waist extension portion 12E There is provided an elastic member that shrinks at least a widthwise range corresponding to the middle portion of the display sheet 25 in the widthwise direction. In the illustrated form, the waist elastic member 17 corresponds to the elastic member of this arrangement. The area where the outer body 12F, 12B and the inner body 200 overlap is difficult to bend because of the high rigidity. In contrast, the waist extension 12E is easily bent due to the low rigidity. Therefore, as shown in FIG. 21, the waist elastic member 17. The display sheet 25 shrinks in the width direction as it approaches the waist side, and the part of the waist extension part 12E between the elastic member and the inner body 200 faces the skin side at the boundary with the inner body 200 By bending, the portion having the display sheet 25 of the waist extension portion 12E rises to the skin side to form a barrier wall for urine or soft stool. Therefore, it is possible to improve the anti-exudation property of urine or soft stool at the waist extension portion 12E of the exterior bodies 12F and 12B. In this case, if the waist extension portion 12E is composed of only the non-woven fabric forming the outer sheet layer 12S and the inner sheet layer 12H, the area where the outer body 12F, 12B and the inner body 200 overlap and the waist extension portion 12E The difference in rigidity becomes larger, so it is preferable. In addition, the greater the number of overlapping sheets of the waist-side edge of the inner body 200, the greater the difference in rigidity, which 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 on the waist edge of the inner body 200, and if the packaging sheet 58 made of crepe paper is further present, the rigidity is increased. In addition, it is also preferable that the bulky intermediate sheet 40 extends to the waist edge of the inner body 200. In order to prevent the regions where the exterior bodies 12F, 12B and the interior body 200 overlap from being bent, it is also preferable to configure the regions so as to coincide with the non-stretchable region A1.

The front-rear direction length 25y of the part located in the waist extension part 12E of the display sheet 25 is not specifically limited, However, in a normal case, it is preferable that it is 5 mm or more. In addition, if the display sheet 25 extends at least to the elastic member closest to the inner body 200 (in the illustrated embodiment, the waist elastic member on the most crotch side among the waist elastic members 17), the outer body 12F is raised. , The waist extension 12E of 12B is particularly preferable in terms of anti-exudation properties for urine or soft stools.

(Cover non-woven fabric) In the shorts-type disposable diaper of the outer two-part split type, since the inner body 200 is exposed between the front outer body 12F and the rear outer body 12B, the cover non-woven fabric 13 is provided. Among them, the cover non-woven fabric 13 Cover the back of the inner body 200 from between the front outer body 2F and the inner body 200 to between the rear outer body 12B and the inner body 200 to prevent the liquid-impermeable sheet 11 from the inner body 200 The back is exposed.

For the cover non-woven fabric 13, a non-porous non-woven fabric that does not have holes penetrating through the front and back surfaces can be used. The part located between the display sheet 25 and the liquid-impermeable sheet 11 extends in the front-rear direction LD. If the cover non-woven fabric 13 is extended between the display sheet 25 and the liquid-impermeable sheet 11 in this way, it can pass through the non-woven fabric having holes 14 from the outside of the disposable diaper and breathe into the display sheet 25 and the liquid-impermeable sheet 11 Therefore, it is possible to prevent a decrease in air permeability when a resin film is used for the material of the display sheet 25.

Although not shown, it may be provided separately from the cover non-woven fabric 13 at least from the edges on the crotch side of the exterior bodies 12F, 12B that overlap the display sheet 25 and extend to the waist opening side to the display sheet 25 and the liquid-impermeable sheet 11 There is a perforated non-woven fabric dedicated to improve air permeability. In addition, when the front and back sides have the display sheet 25, the cover non-woven fabric 13 may be extended between the display sheet 25 and the liquid-impermeable sheet 11 only on either one of the front exterior body 12F and the rear exterior body 12B. .

The type of fibers of the porous nonwoven fabric or the processing method of fiber bonding (crosslinking) are not particularly limited, and the same nonwoven fabric as the material of the exterior bodies 12F and 12B can be appropriately selected. However, it is desirable to use a hot-air nonwoven fabric. The weight per unit area in this case is preferably 20 to 40 g/m ² , and the thickness is preferably 0.3 to 1.0 mm.

The front-to-rear direction range of the cover nonwoven fabric 13 is not particularly limited, and it can be used as shown in FIG. 2, FIG. 5(a), FIG. 5(b), and FIG. It extends in the front-rear direction LD, as shown in FIG. Up to the middle position of the area where the inner body 200 overlaps in the front-rear direction. The length 25w in the front-rear direction of the overlapped portion of the display sheet 25 and the cover nonwoven fabric 13 is preferably 25 to 100% of the length 25y in the front-rear direction of the display sheet 25. In addition, in the case of the mode shown in FIG. 8, the length 13y in the front-rear direction of the overlapping portion of the cover nonwoven fabric 13 and the front exterior body 12F, and the overlapping portion of the cover nonwoven fabric 13 and the rear exterior body 12B The length 13y in the front-rear direction can be appropriately set, but in a normal case, it can be set to approximately 20 to 40 mm, respectively.

The width direction range of the cover nonwoven fabric 13 is regarded as the range which can hide the exposed part of the back surface of the liquid-impermeable sheet 11. Therefore, in the form shown in the figure, since the liquid-impermeable sheet 11 is exposed between the base ends of the left and right side gathers 60, it covers at least the back side of the base end of one side gather 60. The cover nonwoven fabric 13 is provided in the width direction range to the back side of the base end part of the other side part gather 60. As a result, the liquid-impermeable sheet 11 can be concealed by the wrinkle non-woven fabric 62 covering the non-woven fabric 13 and the side gathers 60, and the holes 14 at both ends of the non-woven fabric 13 in the width direction WD can be covered when viewed from the outer surface. It will not be hidden by the pleated non-woven fabric 62. In addition, if the side edge of the cover non-woven fabric 13 is located at the part with the narrowest width of the absorber 56 (the full width is the case without the gathered part 56N. If the gathered part 56N is provided, the width of the gathered part 56N is the largest. The narrow part) at the same position or at a position closer to the center in the width direction than this position, the cover nonwoven fabric 13 is located only on the entire part where the cover nonwoven fabric 13 and the absorber 56 overlap, that is, the rigidity is high and it is difficult to generate wrinkles. Because of the wrinkles or creases, it is difficult for both sides of the cover nonwoven fabric 13 to shrink in the front-rear direction LD, so that it is difficult to form wrinkles on both sides of the cover nonwoven fabric 13 or to crush the holes 14. In addition, even if the wrinkle nonwoven fabric 62 covers the back side of both ends in the width direction of the cover nonwoven fabric 13, instead of covering the width direction both ends of the cover nonwoven fabric 13 on the back side of the base end of the side gathers 60, it can be The liquid-impermeable sheet 11 is concealed by covering the non-woven fabric 13 and the corrugated non-woven fabric 62. In this case, since both sides of the cover nonwoven fabric 13 are covered by the pleated nonwoven fabric 62, there is an advantage that the both sides of the cover nonwoven fabric 13 are not easily peeled from the liquid impermeable sheet 11.

The cover non-woven fabric 13 may have a region where the holes 14 are not present in a part of the front-rear direction LD, but if the effect of improving the air permeability is considered, it is desirable to provide the holes 14 throughout the front-rear direction. On the other hand, in the aspect in which the both ends of the cover nonwoven fabric 13 in the width direction WD have regions where the holes 14 are not present, if the holes 14 are opened by a method other than punching by a cutter, as will be described later, The fibers in the peripheral portion 14e of the hole 14 are retracted to the outside or in the vertical direction, and the peripheral portion 14e of the hole 14 is warped, so that the thickness of the porous area becomes thicker than the non-porous area. Therefore, the cover is stored in a rolled state In the case of the material of the non-woven fabric 13, the non-porous regions are loosely wound, and there is a concern that wrinkles or creases may be formed in the non-porous regions on both sides. Therefore, it is desirable to form the hole 14 over the entire width direction WD as shown in the figure. In addition, by forming holes in the cover non-woven fabric 13 in the manufacturing step of the diaper, it is possible to use non-porous materials and arbitrarily control the formation position of the holes. However, there is the following problem: the introduction of hole forming equipment Therefore, the entire manufacturing becomes larger and the cost or maintenance burden becomes larger. In addition, it is difficult to adjust the hole shape and flexibility in a high-speed production line. Therefore, it is preferable to use a material in which holes are formed throughout the entire front-rear direction and the entire width direction for production.

The planar shape (opening shape) of each hole 14 can be set appropriately. In addition to the elongated hole shape shown in Figure 17 (a) and Figure 17 (b), it can also be set as Figure 17 (c), A perfect circle as shown in FIG. 17(e), polygons such as an ellipse, triangle, rectangle, and rhombus as shown in FIG. 17(d), and arbitrary shapes such as a star shape and a cloud shape. The size of each hole 14 is not particularly limited. The maximum dimension 14L in the front-rear direction LD is preferably 0.4 to 1.8 mm, particularly preferably 0.8 to 1.3 mm, and the maximum dimension 14W in the width direction WD is preferably 0.3 to 1.5 mm. It is particularly preferably 0.5 to 1.0 mm. In the case where the shape of the hole 14 is a shape that is long in one direction such as a long hole, an ellipse, a rectangle, a rhombus, etc., the maximum dimension in the longitudinal direction is preferably the maximum dimension in the direction perpendicular to the longitudinal direction. 2.5 times or less. In addition, when the shape of the hole 14 is long in one direction, it is desirable that the longitudinal direction of the hole 14 is the front-rear direction LD, but it may be the width direction WD or the oblique direction.

Regarding the area and area ratio of each hole 14 as long as it is appropriately determined, the area is preferably about 0.2 to 2.5 mm ² (particularly preferably about 0.5 to 1.5 mm ² ), and the area ratio is preferably about 1.0 to 15.0% (especially Preferably it is about 5.0 to 10.0%).

Regarding the planar arrangement of the holes 14, it can be appropriately determined, but a regularly repeated planar arrangement is preferable, except for the diagonal lattice shape shown in FIG. 17(a) or the hexagonal lattice shape shown in FIG. 17(b) (These are also called staggered shapes), the square lattice shape shown in Fig. 17(c), the rectangular lattice shape shown in Fig. 17(d), and the parallel body lattice shape shown in Fig. 17(e) (as shown in the figure) , A plurality of groups of parallel oblique rows are arranged in two groups so as to cross each other), etc. (including a shape in which the groups of these oblique rows are inclined at an angle of less than 90 degrees with respect to the front-rear direction LD). In addition to the ground repetition, the group of holes 14 (the arrangement of the group unit may be regular or irregular, and may be a pattern or a character shape, etc.) may be regularly repeated.

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

The cross-sectional shape of the hole 14 may be any of the following methods: The first method, in which, as shown in Figs. 14(a)-14(c), the thickness of the non-woven fabric approaches the hole 14 from the periphery of the hole 14 The edge of the hole 14 is thinner, and the edge of the hole 14 is located in the middle of the thickness direction of the non-woven fabric; the second method, in which, as shown in Figure 15 (a)-Figure 15 (c), the peripheral portion 14e of the hole 14 is warped to the front side And the warped height 14h is approximately uniform; and, the third mode, in which, as shown in Figs. 16(a)-16(c), the peripheral portion 14e of the hole 14 is warped toward the front side, and the peripheral portion 14e has The opposite part with the highest tilt height 14i and the lowest part with the lowest tilt height 14j, wherein the lowest part with the lowest tilt height 14j opposes in a direction perpendicular to the opposite part with the highest tilt height 14i The opposite part. From the viewpoint of improving air permeability, it is desirable to have the second method and the third method in which the portion of the hole 14 is thicker than the surroundings. In particular, in the third method, due to the raised height 14i, 14j of the peripheral portion 14e of the hole 14 The gap formed by the difference helps to improve the air permeability and is therefore preferable. In the second and third aspects, the lift heights 14h, 14i, and 14j (apparent heights measured with an optical microscope in a state where no pressure is applied) are preferably about 0.2 to 1.2 mm. In the third aspect, The highest tilting height 14i is preferably about 1.1 to 1.4 times the lowest tilting height 14j.

The hole 14 may be a punched hole with the edge formed by the cut end of the fiber, or it may be a non-punched hole as follows (the fiber density in the surrounding portion is high): there is almost no fiber cut at the edge of the hole 14 The non-punched hole is formed by inserting a needle between the fibers to expand. The former is suitable for the above-mentioned first method, and the latter is suitable for the above-mentioned second and third methods. For example, if a hole 14 having a shape that is long in one direction is formed by inserting a needle, the fibers in the peripheral portion 14e of the hole 14 are retracted outward or in the vertical direction, so that the peripheral portion 14e of the hole 14 is warped, and, The raised height 14i of the opposing portion in the longitudinal direction of the hole 14 is higher than the raised height 14j of the opposing portion in the direction perpendicular to the longitudinal direction. In the second and third aspects described above, the edge portion of the portion where the peripheral portion 14e of the hole 14 is raised to the surface may have a lower fiber density than the surrounding portion, but it is preferably the same or higher. . In addition, it is desirable that the fibers in the peripheral portion 14e of the hole 14 are welded together, but they may not be welded together.

The inner surface and the outer surface of the cover non-woven fabric 13 are respectively adhered to the opposing surface by a hot melt adhesive. Regarding the fixed area of the cover non-woven fabric 13, in addition to setting the entire front-rear direction and the entire width direction of the cover non-woven fabric 13, a part of it may not be fixed. For example, if the widthwise ends of the cover non-woven fabric 13 are not fixed, even in a state where the sides of the absorbent body 56 are contracted to a certain extent due to the influence of the side wrinkles 60, the cover non-woven fabric 13 is not easily affected by the Therefore, there is an advantage that it is difficult to form wrinkles or creases on the cover non-woven fabric 13. In this case, the width of the non-fixed portion at both ends in the width direction of the cover nonwoven fabric 13 may be appropriately determined, and it can be set to, for example, 3 to 10 mm, and preferably 5 to 8 mm.

In the case of the cover non-woven fabric 13 with holes 14, a preferred bonding structure is: as shown in Figure 18 (a)-Figure 18 (d), the adhesive on at least one of the inner surface and the outer surface of the cover non-woven fabric 13 In the bonding area, the hot-melt adhesive 13H does not exist on the central side of the peripheral edge portion 14i of the area overlapping the hole 14, and the hot-melt adhesive 13H is continuous outside the peripheral edge portion 14i of the area overlapping the hole 14 Faceted existence. Since there is no hot-melt adhesive 13H on the central side of the peripheral edge portion 14i of the region overlapping the hole 14, the air permeability is excellent. In addition, there is such an adhesive structure only on the surface opposite to the surface in contact with the skin, and at the part having such an adhesive structure, the hot melt adhesive 13H does not easily produce a sticky skin feel. And the peripheral part 14e of the hole 14 is reliably fixed to the opposing surface.

As a representative bonding state, the following state can be exemplified: as shown in Figure 18 (a) and Figure 18 (b), there is no hot melt adhesive 13H in the area overlapping the hole 14, and the Except for the area where 14 overlaps, the hot melt adhesive 13H is present in a continuous plane; and, as shown in Figure 18 (c) and Figure 18 (d), the hot melt adhesive 13H is on the periphery of the area overlapped with the hole 14 The portion 14i overflows, but there is no hot-melt adhesive 13H on the central side of the peripheral portion 14i of the area overlapping the hole 14, and the hot-melt adhesive 13H is outside the peripheral portion 14i of the area overlapping the hole 14 Exists as a continuous surface. The former state is a particularly desirable state. However, since the peripheral edge portion 14i of the area overlapping the hole 14 is a portion close to the peripheral portion 14e of the hole 14, and the cover non-woven fabric 13 has a certain thickness, even if the latter is heated The fusion bonding agent 13H overflows in this part, but in the part where only the surface on the opposite side of the surface that is in contact with the skin is bonded, when the surface of the cover non-woven fabric 13 on the opposite side to the bonding surface is touched by hand, There is almost no direct contact with the hot melt adhesive 13H. In addition, the overflow width of the hot-melt adhesive 13H at the peripheral edge portion 14i of the area overlapping the hole 14 is preferably less than half the thickness of the cover nonwoven fabric 13 and less than about 0.5 mm. In addition, it is desirable that the hot-melt adhesive 13H does not exist in a portion of 80% or more of the area of the area overlapping the hole 14.

The cross-sectional shape of the hole 14 in the cover non-woven fabric 13 is not particularly limited. However, if the peripheral portion 14e of the hole 14 is a warped portion that is warped toward the liquid-impermeable sheet 11 as described above, it will not be liquid-impermeable. The pore size observed from the liquid-impermeable sheet 11 side is smaller than the pore size observed from the surface on the opposite side of the sheet 11 side. Therefore, it is not easy to touch the hot-melt adhesive 13H at the part where only the surface on the opposite side of the surface in contact with the skin is adhered, when the surface on the opposite side of the adhesive surface is touched by hand. In addition, the warped portion supports the cover non-woven fabric 13 with respect to the facing surface like a support column, and therefore, it becomes bulkier compared to the non-porous non-woven fabric of the same basis weight, and the air permeability is also more excellent. In addition, since the cover non-woven fabric 13 and the liquid-impermeable sheet 11 are easily bonded in areas other than the surrounding portion 14e of the hole 14 The adhesive 13H fills the space between the sheets without gaps, but the substantial amount of application is small, and gaps are likely to occur). Therefore, the peripheral portion 14e of the hole 14 is reliably bonded, and it becomes undesirable in other areas. Complete bonding (substantial bonding area is small), which can obtain excellent softness and softness.

Such bonding structure can be manufactured by the following method: without using air, the hot-melt adhesive is applied to the bonding surface of the porous non-woven fabric in a continuous surface, and then bonded to the opposite surface. . This method is based on the following new discovery: If the hot-melt adhesive is applied to the bonding surface of the porous nonwoven fabric in a continuous surface without using air, it will be heated due to heat before bonding to the opposing surface. For the surface tension of the fusion adhesive, an opening (hole) is opened in the center of the part of the hot-melt adhesive that overlaps the hole of the perforated nonwoven fabric, and the opening is expanded to the periphery of the hole of the perforated nonwoven fabric. That is, if such a bonding method is adopted, as shown by the change shown by the arrow in FIG. 19, after the hot-melt adhesive 13H is applied to the perforated nonwoven fabric in a continuous surface form and before being bonded to the object member, Due to the surface tension of the hot-melt adhesive 13H, an opening (hole) h is opened in the center of the part of the hot-melt adhesive 13H that overlaps the hole 14 of the perforated nonwoven fabric, and the opening h expands to the hole 14 of the perforated nonwoven fabric The surrounding part 14e. Therefore, after the perforated non-woven fabric is bonded to the object part, as shown in Figure 18 (a)-Figure 18 (d), there is no hot melt adhesive 13H in most of the holes 14, nor Since the hot-melt adhesive 13H falls off or oozes from the hole 14 due to air, it is not easy to produce a sticky skin feel when touching the surface on the opposite side of the adhesive surface by hand.

As a hot-melt applicator that applies hot-melt adhesive in a continuous surface without using air, it can be suitably used: slit coating to bond the coating head (die) to the perforated non-woven fabric In surface contact, the hot melt adhesive is extruded and applied from the gap along the CD direction (direction perpendicular to the MD direction (the conveying direction of the manufacturing line)) provided at the end of the coating head; or a non-contact type slit type For coating, the hot melt adhesive is extruded from the gap in the CD direction provided at the end of the coating head with the coating head (die) floating from the bonding surface of the perforated nonwoven fabric, and The difference in the conveying speed of the perforated nonwoven fabric stretches the hot-melt adhesive and coats it into an extremely thin film.

The bonding conditions can be determined appropriately. However, in order to make the hot melt adhesive 13H superimposed on the hole 14 move to the peripheral portion 14e of the hole 14 quickly and firmly adhere to the peripheral portion 14e of the hole 14, it is desirable to satisfy the following conditions At least one of them. Melt viscosity of hot melt adhesive (temperature 140°C): 3000～2600mPa·s Melt viscosity of hot melt adhesive (temperature 160°C): 1150～1550mPa·s When hot melt adhesive is applied to porous nonwoven fabric Temperature: 110～150℃ Application amount of hot melt adhesive for porous non-woven fabric: 1.0～8.0g/m ² Open time after application of hot melt adhesive: 0.1～1.0 Second

Another preferable bonding structure in the case of the cover non-woven fabric 13 with the hole 14 is as shown in Fig. 20(a)-20(f): the surrounding portion 14e of the hole 14 on the cover non-woven fabric 13 becomes warped The warped portion, and at least the end portion of the warped portion becomes an adhesive portion that is adhered to the opposing surface (in this case, the liquid-impermeable sheet 11) by the hot-melt adhesive 13H, and the adhesive portion The other parts are not glued. If there is such an adhesive structure, the adhesive area becomes small without impairing flexibility, and the peripheral portion 14e of the hole 14 can be reliably fixed to the opposing surface. In particular, the warped portion supports the cover non-woven fabric 13 with respect to the facing surface like a support column, and therefore becomes bulkier compared to a non-porous non-woven fabric of the same basis weight, and is also more excellent in air permeability.

As a representative bonding method, the following methods can be exemplified: as shown in Figure 20 (a) and Figure 20 (b), only the end of the warped part is bonded to the opposite side by the hot melt adhesive 13H As shown in Figure 20 (c) and Figure 20 (d), the entire warped part is bonded to the opposite surface by the hot melt adhesive 13H; and, as shown in Figure 20 (e), Figure 20 (f) As shown in ), the entire end portion of the warped portion outside of the inner portion is adhered to the opposite surface by the hot-melt adhesive 13H, and the inner portion of the end portion is not adhered. It is desirable that no adhesive is present at the inner peripheral surface of the hole 14 and the facing surface of the warped portion that overlaps the hole 14, but it may overflow slightly.

Regarding the bonding state of the warped portion, as long as at least the end portion is adhered to the opposing surface with the hot melt adhesive 13H, it is not limited to the illustrated manner. At least a part of the circumferential direction of the hole 14 may be any one of the above-mentioned bonding. Just way. For example, in the case where the warped portion is continuous in the circumferential direction of the hole 14 to form a cylindrical shape as shown in Figs. 15(a) to 16(c), it is preferable to make the entire circumferential direction of the cylindrical end portion It is in the above-mentioned bonding state, but it can also be in other bonding state or not bonding locally. In addition, in the case where the warped portion is formed only in a part of the circumferential direction of the hole 14, the tip portion of the portion may be in the above-mentioned bonded state. In addition, different bonding states may be mixed in a plurality of warped portions.

(Inner-outer joint part) The fixing of the inner body 200 to the outer bodies 12F and 12B can be performed by a bonding means based on material welding such as heat sealing and ultrasonic sealing, or a hot melt adhesive. In the method shown in the figure, the hot melt adhesive is applied to the back surface of the inner body 200, in this case, it is applied to the back surface of the liquid-impermeable sheet 11 and the side folds. The hot-melt adhesive on the root portion 65 of 60 is used to fix the inner surface of the exterior body 12F, 12B. The inner and outer joints 201, 202 that fix the inner body 200 and the outer body 12F, 12B together can be arranged in almost the entire area where the two overlap, for example, can be arranged on both ends of the inner body 200 except for the widthwise ends Outside the department. In particular, if the inner and outer joints 201, 202 are provided throughout the area overlapping the cover nonwoven fabric 13 and the areas on both sides of the width direction than the area, the both sides of the cover nonwoven fabric 13 can be firmly fixed, and the cover nonwoven fabric 13 The both side parts are not easily peeled off from the inner body 200, so it is preferable.

As shown in Figures 9 and 10(a)-10(c), it is preferable that the inner and outer joints 201 of the front exterior body 12F are provided on the waist side so as to extend to both ends in the width direction, and the width increases as it faces The edge of the front side exterior body 12F on the crotch side is gradually or continuously reduced, so that non-joint portions 203 are formed at both ends of the front side exterior body 12F in the width direction on the crotch side. Thus, even the edge of the crotch side of the front exterior body 12F is divided into two parts in which the edge of the front exterior body 12F intersects the side edge of the interior body 200 in a straight or nearly linear shape along the width direction at a right angle or a nearly right angle. It can also improve the fit of the groin when sitting or walking.

The size of the non-joining portion 203 may be appropriately determined, but in the case of infants and young children, the front-rear dimension of the non-joining portion 203 can be set to approximately 10 to 30 mm, and the width-direction size of the non-joining portion 203 can be set to approximately 10～25mm. In addition, in the case of adult use, the front-rear dimension of the non-joining portion 203 can be set to about 10-30 mm, and the width-direction dimension of the non-joining portion 203 can be set to about 10-25 mm. The front edge of the non-joint portion 203 (in the case of a curve, the most front side portion) is preferably at a position overlapping the front half-lodging portion 68F, and particularly preferably a portion located on the rear side of the front half-lodging portion 68F.

In particular, if the elastic member of the stretchable area A2 of the lower waist portion of the front exterior body 12F extends into the non-joined portion 203 formed at both ends of the crotch side of the front exterior body 12F in the width direction, the non-joined portion 203 also elastically expands and contracts in the width direction, and the fit of the groin is better. In addition, if the curved form is adopted as in the side gathers 60 of the first aspect described above, and the front half-lodging portion 68F is provided, the fit of the groin will be better. Furthermore, as described above, it is more preferable that the front half-lodging portion 68F extends to the same position as the edge on the crotch side of the front exterior body 12F or further extends to the center side in the front and rear direction. Furthermore, when the absorber 56 is formed in an hourglass shape, if the front half-lodging portion 68F is located on the absorber so as not to overlap the gathered portion 56N, the roots of the three-dimensional wrinkles are stabilized, and the front half-lodging portion 68F is easy to stand up. , So it is preferred.

On the other hand, if the inner and outer joints 202 of the rear exterior body 12B are provided throughout the entire front and rear direction and across both ends in the width direction, the interior body 200 is less likely to sink into the gluteal sulcus, which is preferable. In this case, if the curved form is adopted and the rear half-lodging portion 68B is provided as in the side gathers 60 of the first aspect described above, the terminal side portion 60A of the three-dimensional gathers is not easily inclined to the gluteal groove. Tipping in the opposite direction is therefore preferable. Furthermore, as described above, if the rear half-lodging portion 68B extends to the same position as the front edge of the rear exterior body 12B or further extends forward and backward toward the center of the LD, the interior body 200 is prevented from sinking into the gluteal sulcus. The sinkability is further improved, and when the buttocks cover C is provided, the buttocks cover C is less likely to shift, and the maintainability of the buttocks cover is excellent. More preferably, the length of the rear half-lodging portion 68B in the front-rear direction is longer than the length of the rear lodging portion 67 in the front-rear direction. Moreover, when the absorber 56 is formed in an hourglass shape, if the rear half-lodging portion 68B is located on the absorber without overlapping the gathered portion 56N, the inner body 200 is particularly unlikely to sink into the gluteal sulcus, so it is preferable of.

In the case of adopting a curved form such as the side gathers 60 of the first aspect, if both the front side half-lodging portion 68F and the rear side half-lodging portion 68B are provided, the length of the rear side half-lodging portion 68B and the front side half-lodging portion 68F If the ratio of the length of the three-dimensional wrinkles is in the range of 0.9 to 1.5, the three-dimensional wrinkles can stand up high over a long range in the front-rear direction, and the end-side part 60A and the root-side part 60B will not become excessively free, respectively. Therefore, the fit around the entire leg becomes good.

<Explanation of terms in the specification> Unless otherwise stated in the specification, the following terms in the specification have the following meanings.

・The "front-rear (longitudinal) direction" refers to the direction that connects the ventral side (front side) and the back side (rear side), and the "width direction" refers to the direction perpendicular to the front-rear direction (left-right direction).

・"Front side" refers to the side close to the wearer's skin when wearing shorts-type disposable diapers, and "back side" refers to the side farther from the wearer's skin when wearing shorts-type disposable diapers.

・"Front" refers to the side of the component that is close to the wearer's skin when wearing shorts-type disposable diapers, and "back side" refers to the side farther from the wearer's skin when wearing shorts-type disposable diapers.

・"Area rate" refers to the proportion of the object part to the unit area, and is the ratio of the total area of the object part (such as holes) in the object area (such as cover non-woven fabric) minus the area of the object area and expressed as a percentage. In the method where a plurality of object parts are arranged at intervals, it is desirable to set the object area for a size containing more than 10 object parts, and obtain the area ratio. For example, for the area ratio of holes, for example, a device under the trade name of KEYENCE, VHX-1000, can be used, the measurement condition is set to 20 times, and the measurement can be performed in the following procedure. (1) Set the lens to 20 times and adjust the focal length. Adjust the position of the non-woven fabric so that 4×6 holes appear. (2) Specify the brightness of the area of the hole, and measure the area of the hole. (3) Click the color extraction of "Area Measurement" of "Measurement and Comment". Click on the part of the hole. (4) Click "Measure together" and select "Display measurement result window" to save as CSV data.

・"Elongation" refers to the value when the natural length is set to 100%.

・"Gel strength" is measured as follows. 49.0g of artificial urine (mixed with urea: 2wt%, sodium chloride: 0.8wt%, calcium chloride dihydrate: 0.03wt%, magnesium sulfate heptahydrate: 0.08wt% and ion exchange water: 97.09wt% Add 1.0g of super absorbent polymer to the mixture), and stir with a blender. Place the resulting gel in a constant temperature and humidity tank at 40℃×60%RH for 3 hours and then return to room temperature. Use a curd meter (manufactured by I.techno Engineering: Curdmeter-MAX ME-500) to measure the gel strength .

・"Weight per unit area" is measured as follows. After pre-drying the sample or test piece, place it in a test room or device in a standard state (the temperature of the test site is 20±5°C, and the relative humidity is below 65%) to make it into a constant state. Preliminary drying refers to making the sample or test piece constant in an environment with a relative humidity of 10-25% and a temperature of not more than 50°C. In addition, for fibers with a legal moisture content of 0.0%, preliminary drying is not necessary. Using the template (200mm×250mm, ±2mm) for sample collection, cut a sample with a size of 200mm×250mm (±2mm) from the test piece in a constant state. The weight of the sample is measured, and the weight per square meter is calculated 20 times as the weight per unit area.

・"Thickness" is automatically measured with an automatic thickness measuring device (KES-G5 portable compression measurement program) under the conditions of a load of 0.098N/cm ² and a pressurized area of 2 cm ² .

・Water absorption is measured in accordance with JIS K7223-1996 "Test Method for Water Absorption of Super Absorbent Resin".

・The water absorption speed is the "time to the end point" when JIS K7224-1996 "Test Method for Water Absorption Speed of Super Absorbent Resins" is carried out using 2 g of super absorbent polymer and 50 g of physiological saline.

・"Unfolded state" refers to a state that is unfolded flat without shrinking or slack.

・As long as there is no special description, the size of each part refers to the size in the unfolded state and not in the natural long state.

・In the absence of a description of the environmental conditions in the test or measurement, the test or measurement is performed in a laboratory or device in a standard state (the test site is at a temperature of 20±5°C and a relative humidity of 65% or less) .

[Industrial Applicability] The present invention can be used for shorts-type disposable diapers.

11‧‧‧Impermeable sheet 12B‧‧‧Back exterior body 12E‧‧‧Waist extension 12F‧‧‧Front exterior body 12H‧‧‧Inner sheet 12S‧‧‧Outer sheet 13‧ ‧‧Cover non-woven fabric 14‧‧‧Hole 17‧‧‧Waist elastic part 18‧‧‧Excess elastic part 200‧‧‧Inner body 201,202‧‧‧Internal and external joint part 203‧‧‧Non-joint part 25‧‧‧ Display piece 30‧‧‧Top piece 40‧‧‧Middle piece 50‧‧‧Absorbent member 56‧‧‧Absorber 58‧‧‧Packing sheet 60‧‧‧Side folds 60A‧‧‧End side part 60B‧‧ ‧Root side part 62‧‧‧Wrinkled non-woven fabric 67‧‧‧Lodging part 68B‧‧‧Back side half-lodging part 68F‧‧‧Front side half-lodging part A1‧‧‧Non-stretching area A2. ‧Middle area LD‧‧‧Fore-and-aft direction T‧‧‧Waist area U‧‧‧Lower waist W‧‧‧Waist WO‧‧‧Waist opening

Fig. 1 is a plan view showing the inner surface of the shorts-type disposable diaper in an unfolded state. Fig. 2 is a plan view showing the outer surface of the shorts-type disposable diaper in an unfolded state. Fig. 3 is a cross-sectional view taken along line 2-2 in Fig. 1. Fig. 4 is a cross-sectional view taken along line 3-3 in Fig. 1. Fig. 5(a) is a cross-sectional view taken along line 4-4 in Fig. 1 and Fig. 5(b) is a cross-sectional view taken along line 5-5 in Fig. 1. Fig. 6 is a perspective view of a shorts-type disposable diaper (with holes omitted). Fig. 7 is a plan view showing the outer surface of the inner body in an unfolded state. Fig. 8 is a plan view showing the outer surface of the inner body in the unfolded state together with the outline of the outer body. Fig. 9 is a plan view showing only the important part of the outer surface of the shorts-type disposable diaper in an unfolded state. Fig. 10(a) is a plan view showing an important part of the front side of the shorts-type disposable diaper in an unfolded state, Fig. 10(b) is a cross-sectional view taken along line 6-6 of Fig. 10(a), and Fig. 10(c) It is a cross-sectional view taken along line 7-7 of Fig. 10(a). Fig. 11(a) is a plan view showing the important part of the back and front side of the shorts-type disposable diaper in the unfolded state, Fig. 11(b) is a cross-sectional view taken along line 6-6 of Fig. 11(a), Fig. 11(c ) Is a cross-sectional view taken along line 7-7 of Fig. 11(a). Fig. 12 is a cross-sectional view along line 2-2 in Fig. 1 showing another mode. Fig. 13 is a cross-sectional view 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 along the line 8-8 in Fig. 14(b) Cutaway view. Figure 15 (a) is a perspective view showing the holes of the perforated nonwoven fabric, and Figure 15 (b) is a plan view showing the holes of the perforated nonwoven fabric. Figure 15 (c) is taken along line 8-8 in Figure 15 (b) Sectional view. 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 along line 8-8 in Fig. 16(b) Cutaway view. Figure 17 (a)-Figure 17 (e) is an enlarged plan view of the important part of the perforated non-woven fabric. 18(a) and 18(c) are cross-sectional views of the bonding part of the cover nonwoven fabric, and FIGS. 18(b) and 18(d) are plan views of the bonding part of the cover nonwoven fabric. Fig. 19 is a plan view showing the change of the hot-melt adhesive during application. Figure 20 (a), Figure 20 (c), Figure 20 (e) is a cross-sectional view of the adhesive part of the cover non-woven fabric, Figure 20 (b), Figure 20 (d), Figure 20 (f) is the adhesive cover of the non-woven fabric Partial top view. Fig. 21 is a cross-sectional view showing an important part of a part having a display sheet. Figs. 22(a) and 22(b) are perspective views showing important parts of a shorts-type disposable diaper. Fig. 23 is a plan view showing the outer surface of the shorts-type disposable diaper in an unfolded state. Fig. 24(a) is a cross-sectional view taken along line 4-4 in Fig. 23, and Fig. 24(b) is a cross-sectional view taken along line 5-5 in Fig. 23.

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11‧‧‧Impermeable film

12B‧‧‧Back exterior body

202‧‧‧Inner and outer joint

30‧‧‧Top Film

50‧‧‧Absorbing member

60‧‧‧Side wrinkles

60A‧‧‧End side part

60B‧‧‧Root side part

62‧‧‧Pleated non-woven fabric

67‧‧‧Lodging part

68B‧‧‧Back side half-lodging part

LD‧‧‧Fore and aft direction

Claims (6)

A shorts-type disposable diaper comprising a front outer body constituting at least the waist part of the front body and a rear outer body constituting at least the waist part of the back body, respectively, the front outer body and the rear outer body Separate in the front-rear direction at the middle of the front-rear direction, the inner body containing the absorbent body, extends from the front outer body to the rear outer body in the front-rear direction, and is respectively joined to the front outer body And the back exterior body, the shorts-type disposable diaper is provided with side seals, waist openings, and left and right sides formed by joining both sides of the front exterior body and both sides of the rear exterior body. Opening to the legs, the shorts-type disposable diaper is characterized in that the inner body is provided with three-dimensional gathers standing up from both sides of the inner body, and the three-dimensional gathers have: a main body part having The root side portion extending from both sides of the front surface of the inner body to the center side in the width direction and the end side portion extending from the end of the root side portion to the width direction outer side; the lodging portion is the front and back of the main body portion The part where both ends of the direction are fixed on the front of the inner body in the down state; the unfixed free part is located between the front and back down parts; and the corrugated elastic member is arranged in the front and back direction At least the end portion of the free part; the three-dimensional fold has a rear half-lodging portion, the rear half-lodging portion and the front side of the rear side of the lodging portion are continuous or adjacent to the front side of the rear side half-lodging portion , The end side portion is joined to the The root side portion, and the root side portion and the front surface of the inner body are not joined together. The shorts-type disposable diaper according to claim 1, wherein the inner and outer joints that join the inner body and the rear outer body together cover the entire front-rear direction and the widthwise direction. The way to set the end. The shorts-type disposable diaper according to claim 2, wherein the absorbent body has a gathered part in the middle of the front and rear direction, and the width of the gathered part is narrower than the width of the front and rear sides of the gathered part, and the rear side The half-lodging portion extends to the same position as the front edge of the rear exterior body, or extends from the front edge of the rear exterior body further to the center side in the forward and rearward direction, and the rear half-lopped portion does not overlap with the gathered portion The overlapping manner is located on the absorbent body. The shorts-type disposable diaper according to claim 2 or 3, wherein the rear half-fallen portion extends to the same position as the front edge of the rear outer body, or further from the front edge of the rear outer body Extends forward and backward toward the center side. The shorts-type disposable diaper according to claim 2 or 3, wherein the front-rear dimension of the rear half-lodging portion is longer than the front-rear dimension of the rear lodging portion. The shorts-type disposable diaper according to claim 1 or 2, wherein the three-dimensional gathers have a front half-lodging portion, and the front half-lodging portion is continuous or adjacent to the rear side of the lodging portion on the front side. In the front half-lodging portion, the root-side portion is joined to the root portion in a lodging state The front side of the inner body, and the end side part and the root side part are not joined together.

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