TW202224656A - Pants-type disposable wearable article - Google Patents

Abstract

To inhibit gaps in standing gathers. The problem is solved by a configuration wherein: the front waist-encircling section comprises a first area U1 located in the middle of the front-to-back direction LD as well as a second area U2 and a third area U3 located on the two edges thereof; the back waist-encircling section comprises a fourth area U4 located in the middle of the front-to-back direction LD as well as a fifth area U5 and a sixth area U6 located on the two edges thereof; the first area U1 has a stronger tightening force than the second area U2 and the third area U3, and the fourth area U4 has a stronger tightening force than the fifth area U5 and the sixth area U6; and a tubular portion 12C, where the first area U1 and the fourth area U4 connect in the waist-encircling direction, overlaps with the boundaries 69 between decumbent portions 67 and standing portions 68 in the front waist-encircling section and/or the back waist-encircling section, and also has at least one waist lower elastic member 16 or 19 on the waist opening WO-side and on the leg opening LO-side, respectively, of the boundaries 69.

Description

Pants-type disposable wearing articles

The present invention relates to a pants-type disposable wearing article provided with standing gathers.

Pants-type disposable wearing articles generally include: an outer body that constitutes at least an annular waist portion; and an inner body including an absorber, which is attached to the outer body so as to extend from the front body to the back body The side edges of the outer body of the front body and the side edges of the outer body of the rear body are joined together to form side seals, thereby forming a waist opening and a pair of left and right leg openings (for example, refer to Patent Document 1 ~3).

In such a pant-type disposable diaper, in order to improve the fit to the body, the outer body has a laminated structure having a plurality of sheet layers, and various elastic members in an extended state are attached between the sheets. , wherein, in the waist area determined by the front-rear direction range corresponding to the side seal portion, or the intermediate area between the front and rear waist areas, spaced in the front-rear direction and installed in a state of being able to expand and contract in the width direction, respectively There is an elongated elastic member along the width direction, and the fit to the body is relatively high.

Moreover, in order to prevent the so-called side leakage in the pants-type disposable wearing article, generally, there are raised gathers raised from both sides in the width direction of the surface. There are various structures of the standing gathers, and many standing gathers have the following basic structures. That is, it has a root portion fixed to the inner body, a main body portion protruding from the root portion, a front end portion and a rear end portion of the main body portion are fixed to the surface of the disposable diaper in a down state. A non-fixed upright portion between the front and rear downed portions in the main body portion, and a pleated elastic member attached to at least a front end portion of the upright portion in the front-rear direction.

Since the standing gathers are provided in the inner body, the body surface of the wearer is pressed by the outer body through the inner body. Furthermore, the outer body presses the wearer's body surface by the elastic member provided in itself. As a result, the fit of the raised gathers can be ensured.

However, in the conventional trousers-type disposable wearing articles, a gap extending in the width direction is generated at the boundary between the flattened portion and the upright portion, and this gap occurs on the side more than the standing gather. leakage.

[Prior Art Literature] (patent literature) Patent Document 1: Japanese Patent No. 5790031 Patent Document 2: Japanese Patent Laid-Open No. 2014-028308 Patent Document 3: Japanese Patent Laid-Open No. 2011-101813

[Problems to be Solved by Invention] Therefore, the main problem to be solved by the present invention is to suppress the occurrence of a gap at the boundary between the fallen portion and the raised portion in the raised wrinkle.

[Technical means to solve the problem] Pants-type disposable wearing articles that solve the above problems are as follows. ＜First form＞ A pants-type disposable wearing article, comprising: Waist opening and left and right pair of leg openings; an exterior body having a front waistline and a rear waistline; and, An inner body attached to the outer body so as to extend in the front-rear direction over the front waist portion and the rear waist portion; On both sides of the inner body, there are provided standing gathers so as to contact the wearer's body surface; The above-mentioned standing gathers have a standing portion extending from the waistline portion on the front side to the waistline portion on the rear side through the crotch portion, and a falling portion that is continuous on both front and rear sides of the standing portion and is fixed in a falling state, and an elongated corrugated elastic member arranged at least at the front end of the upright portion along the front-rear direction; The above-mentioned standing portion can expand and contract in the front-rear direction together with the above-mentioned corrugated elastic member; The front waistline portion and the rear waistline portion have a waist portion located at the edge of the waist opening, and a waist lower portion located on the side of the leg opening from the waist portion; The waist lower portion of the front waist portion and the rear waist portion has at least an elastic region under the waist provided on both sides in the width direction; The lower waist elastic region in the front waist portion and the rear waist portion has a built-in elongated waist lower elastic member along the width direction, and can expand and contract in the width direction together with the waist lower elastic member; The pants-type disposable wearing article is characterized in that the lower waist expansion and contraction region in the front waist portion is composed of a first region located in the middle in the front-rear direction, and a second region located on the waist opening side of the first region. an area, and a third area located on the side of the leg opening more than the first area; The first area, the second area, and the third area are areas in which a plurality of the elastic members below the waist are arranged at intervals in the front-rear direction, respectively; The first region is a region where the contraction force in the width direction of each of the elastic members below the waist is 1.1 to 2.0 times that of the second region and the third region; In the waistline portion on the rear side, the lower waist elastic region is composed of a fourth region located in the middle in the front-rear direction, a fifth region located on the waist opening side of the fourth region, and a fourth region located closer to the fourth region. Formed by the sixth area on the side of the leg opening; The fourth region, the fifth region, and the sixth region are regions in which a plurality of the elastic members below the waist are arranged at intervals in the front-rear direction, respectively; The fourth region is a region where the contraction force in the width direction of each of the elastic members below the waist is 1.1 to 2.0 times that of the fifth region and the sixth region; The aforementioned first region and the aforementioned fourth region have cylindrical portions connected together in the waistline direction; The cylindrical portion overlaps with the boundary between the falling portion and the standing portion at least one of the front waistline portion and the rear waistline portion, and is located closer to the waist opening than the boundary. Further on the leg opening side, each has at least one elastic member under the waist.

(Effect) In the pants-type disposable wearing article, the first region and the fourth region of the elastic member under the waist respectively have a plurality of strips, and the fastening force is stronger than the waist opening side and the leg opening side, and the first region and the fourth region are stronger than the waist opening side and the leg opening side. The cylindrical portion of the four regions connected together in the waistline direction overlaps with the boundary between the falling portion and the standing portion at least one of the front waistline portion and the rear side waistline portion, and is more than the boundary. The waist opening side and the leg opening side are each provided with at least one elastic member below the waist. Therefore, since the waist opening side and the leg opening side of the boundary between the fallen portion and the rising portion of the standing gathers can be strongly fastened locally, gaps are not easily generated at the boundary. Moreover, the fastening force of the second region and the third region is weaker than that of the first region, and the fastening force of the fifth region and the sixth region is weaker than that of the fourth region, so the overall wearing feeling is improved. Balance is not easily damaged.

In addition, the "contraction force at the time of extension" refers to the "contraction force when it is stretched to the elastic limit in the width direction and then contracted to 3/4 of its size." In general pant-type disposable diapers, it is assumed that the wear Condition when the wearer fits the size.

<Second form> The pants-type disposable wearing article according to the first aspect, wherein the lower waist elastic member in the first region and the lower waist elastic member in the fourth region extend toward the center side in the width direction so as to be the same as the waist elastic member. Stand up where the folds overlap, and, Among the regions where the inner body and the outer body overlap, the lower waist elastic member of the first region and the lower waist elastic member of the fourth region, and the portion overlapping the standing gathers, the inner The package body is joined to the aforementioned outer package body.

(Effect) With the structure of the second aspect, the tightening force of the elastic member under the waist is applied more directly to the sides closer to the waist opening and closer to the leg opening than the boundary between the slumped portion and the raised portion. , so it is better.

<The third aspect> The pants-type disposable wearing article according to the first aspect or the second aspect, wherein the third region and the sixth region, as opening toward the legs, have a width of each of the elastic members under the waist When the direction is extended, the stretching force becomes weaker by one stage or more every other or a plurality of strips.

(Effect) When the fastening in the first region and the fourth region is strong, if the fastening force of the third region and the sixth region on the leg opening side thereof is fixed, and the one closer to the first region and the fourth region is appropriately set is tightened, the tightening on the open side of the leg becomes tight, making it difficult for the leg to move. Conversely, when the ease of movement of the legs is emphasized, the tightening of one of the first region and the fourth region becomes loose, and the fit is lowered. Therefore, if the fastening force of the third region and the sixth region is gradually weakened as in this aspect, it is possible to achieve both the fit and the ease of movement of the legs, which is preferable.

<The fourth aspect> The pants-type disposable wearing article according to any one of the first aspect to the third aspect, wherein the position of the edge of the waist opening side of the first region is the same as the waist of the fourth region. The position of the edge on the opening side coincides in the longitudinal direction orthogonal to the width direction; and, The position of the edge on the leg opening side of the first region and the position of the edge on the leg opening side of the fourth region coincide in the longitudinal direction orthogonal to the width direction.

(Effect) In this aspect, the front waistline and the rear waistline have symmetrical expansion and contraction properties in the strongly tightened portion, so it is suitable for a product including the structure and arrangement of the inner body that are symmetrical before and after.

<Fifth aspect> The pants-type disposable wearing article according to any one of the first aspect to the third aspect, wherein the edge on the waist opening side of the first region is located more than the waist opening in the fourth region. The edge of the side is closer to the aforementioned leg opening side; The edge on the leg opening side of the first region is located closer to the leg opening side than the edge on the leg opening side of the fourth region.

(Effect) For example, in products that attach importance to the fit of the body surface, such as a product to a certain extent, the structure including the inner body and the asymmetric structure before and after the arrangement are often desired. In such a product, as in this aspect, better fit can be obtained if the first region of the waistline on the front side is positioned closer to the leg opening than the fourth region of the waistline on the rear side.

＜Sixth aspect＞ The pants-type disposable wearing article according to the fourth aspect or the fifth aspect, wherein the contraction force in the width direction of each of the elastic members below the waist in the first region is the fourth region. 0.9 to 1.1 times the contraction force of each of the aforementioned elastic members under the waist when the width direction is stretched; The contraction force of each of the aforesaid lower waist elastic members in the width direction in the second region is 0.9 to 1.1 times of the contraction force in the width direction of each of the aforementioned waist lower elastic members in the fifth region; The contraction force of each of the under-waist elastic members in the third region during expansion in the width direction is 0.9 to 0.9 of the contraction force in the width direction of each of the at least one under-waist elastic member in the sixth region. 1.1 times.

(Effect) In this aspect, the tightening force of the elastic member under the waist is almost equal on the front side and the rear side of the waist portion, whereby the waist portion is tightened uniformly in the waist circumference direction, which is preferable.

<Seventh aspect> The pants-type disposable wearing article according to any one of the first aspect to the sixth aspect, wherein all the elastic members below the waist have the same material and elongation; The thickness of the elastic member under the waist in the first region and the fourth region is the thickness of the elastic member under the waist in the second region and the third region and the fifth region and the sixth region. 1.1 to 2.3 times.

(Effect) As in this aspect, the material and elongation of all the lower waist elastic members are made the same, and only the thickness is changed according to each region, thereby making it easy to manufacture, and in the state of natural length (contracted state) The product shape is also good, so it is preferable.

<The eighth aspect> The pants-type disposable wearing article according to any one of the first aspect to the seventh aspect, wherein the exterior body has a front exterior body and a rear exterior body, and the front exterior body constitute at least the waistline of the front body, and the rear outer body constitutes at least the waistline of the rear body; Joining the two sides of the aforementioned front side exterior body and the aforementioned two sides of the aforementioned rear side exterior body together, respectively, to form a side seal portion; The front-side exterior body and the rear-side exterior body are not continuous on the crotch side but are separated in the front-rear direction.

(Effect) As one form of the pants-type disposable wearing article, there is known a pants-type disposable wearing article including: an outer body that joins both side parts of the front outer body and the rear outer body with side seals and the inner body, which is provided on the outer body from the front side outer body through the crotch to the inner surface of the rear side outer body; the front side outer body and the rear side The exterior body is separated in the front-rear direction without being continuous on the crotch side. Such a two-part outerwear type pants-type disposable wearing article has the advantage that the outer body does not need to be cut out in order to form the leg openings, and even if cutting is required, only a small area of the outer body can be cut. That is, since the cut pieces (cut scraps) are discarded, there is an advantage that waste (cut loss) of the material can be suppressed.

However, in such a trousers-type disposable wearing article of a two-part outerwear type, since the distance from the position where the inner body abuts the crotch portion to the intersecting position of the inner body and the outer body is long when worn, the The inner body is easily shaken from side to side by using the intersection position as a fulcrum. Therefore, compared with the type with the outer body that is continuously formed from the front body to the rear body, the inner body of the outer body is divided into two parts in the lateral direction. As a result of the movement, a gap is likely to be generated at the boundary between the flattened portion and the raised portion in the raised folds. Therefore, when applying to a two-division exterior type, the above-mentioned tightening balance of the waist portion is particularly significant.

[Effect of invention] ADVANTAGE OF THE INVENTION According to this invention, it can suppress that a clearance gap arises in the boundary of the fallen part and the raised part in a standing gather.

Hereinafter, as an example of a pants-type disposable wearing article, a pants-type disposable diaper will be described in detail with reference to the accompanying drawings. The respective constituent members adjacent in the thickness direction can be fixed or joined in the same manner as a conventional diaper as necessary, except for the fixing or joining portion described below. The dotted portion in the cross-sectional view represents an adhesive such as a hot-melt adhesive as the fixing or joining means. Hot-melt adhesives can be applied by slit coating, continuous linear or dotted bead coating, spiral, Z-shaped, wave-like spraying, or pattern coating (heating by letterpress). It is applied by conventional methods such as transfer of melt adhesive). Instead or in parallel, a hot-melt adhesive can be applied to the outer peripheral surface of the elastic member at the fixing portion of the elastic member, and the elastic member can be fixed to the adjacent member. As the hot-melt adhesive, it can be used without particular limitation, for example, existing ones of EVA (ethylene-vinyl acetate copolymer) type, adhesive rubber type (elastic type), olefin type, polyester and polyamide type are available. of hot melt adhesive. As the fixing and joining means for joining the constituent members, material welding means such as heat sealing and ultrasonic sealing can also be used. In the portion where the liquid permeability in the thickness direction is required, the constituent members adjacent in the thickness direction are fixed or joined by intermittent patterns. For example, when such intermittent fixing or joining is performed by a hot-melt adhesive, intermittent pattern coating such as spiral, Z-shape, and wave-shape can be appropriately used, and the coating width or more can be applied by one nozzle. In the coating, intermittent pattern coating such as helical, Z-shaped, and wave-shaped can be performed with or without spacing in the width direction. As the joining means for joining the respective constituent members, material welding means such as heat sealing and ultrasonic sealing can also be used.

Moreover, as a nonwoven fabric in the following description, a well-known nonwoven fabric can be used suitably according to a site|part and the objective. As the constituent fibers of the nonwoven fabric, for example, synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene and polypropylene (including composite fibers such as core-sheath and the like in addition to monocomponent fibers) can be selected. Regenerated fibers such as rayon and cuprammonium fibers, and natural fibers such as cotton can also be used without particular limitation, and these fibers can also be used in combination. In order to improve the flexibility of the nonwoven fabric, it is preferable that the constituent fibers are crimped fibers. In addition, the constituent fibers of the nonwoven fabric may be hydrophilic fibers (including fibers having hydrophilicity by a hydrophilic agent), hydrophobic fibers, or water-repellent fibers (including fibers having water-repellent properties by a water-repellent agent). In addition, nonwovens are generally classified into short fiber nonwovens, long fiber nonwovens, spunbond nonwovens, meltblown nonwovens, spunlace nonwovens, hot rolling (hot air) according to fiber length, sheet formation method, fiber bonding method, and laminated structure. Non-woven fabrics, needle-punched non-woven fabrics, point-bonded non-woven fabrics, laminated non-woven fabrics (SMS non-woven fabrics formed by sandwiching a meltblown layer between spunbond layers, SMMS non-woven fabrics, etc.), etc., any of these non-woven fabrics can also be used.

1 to 6 show an example of a pant-type disposable diaper. The pants-type disposable diaper is provided with: a rectangular front outer body 12F constituting a front waist portion; a rectangular rear outer body 12B constituting a rear waist portion; and an inner body 200 extending from the front The casing 12F is provided inside the outer casings 12F and 12B so as to extend through the crotch to the rear outer casing 12B. Both sides of the front side exterior body 12F and both sides of the rear side exterior body 12B are joined together to form the side seals 12A, whereby the openings formed by the front and rear end parts of the exterior bodies 12F and 12B are used for the wearer. The waist openings WO through which the waist passes through, on both sides of the inner body 200 in the width direction, the portions surrounded by the lower edges of the outer bodies 12F and 12B and the side edges of the inner body 200 respectively become the leg openings LO through which the legs pass. The inner body 200 is a part for absorbing and retaining 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 represents 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 represents the full width of the diaper in the unfolded state.

The present pant-type disposable diaper has a waist region T determined to have a front-rear direction range (the front-rear direction range from the waist opening WO to the upper end of the leg openings LO) having the side seals 12A, and a middle region L, the middle The area L is determined as the front-rear direction range of the portion forming the leg opening LO (between the front-back direction area having the side seal portion 12A of the front body F and the front-back direction area having the side seal portion 12A of the rear body B). The portion located in the waist region T of the front outer body 12F and the rear outer body 12B, that is, the front waist and the rear waist, can be conceptually divided into "waist" W that forms the edge of the waist opening. , and the lower part, that is, the "waist lower part" U1 to U3 and U4 to U6. Generally, when the front waistline portion and the rear side waistline portion have boundaries where the expansion and contraction stress in the width direction WD changes (for example, the thickness and elongation of the elastic member change), the front waistline portion and the rear side waistline portion have a boundary where the elastic stress in the width direction WD changes (for example, the thickness and elongation of the elastic member change), and the width of the front waistline portion and the backside waistline portion are more The portion closer to the waist opening WO side of the boundary becomes the waist portion W, and when there is no such boundary, the waist extending portion 12E extending further toward the waist opening WO side than the absorber 56 or the inner body 200 becomes the waist portion W. These lengths in the front-rear direction vary depending on the size of the product, and can be appropriately determined. As an example, the waist W can be set to 15 to 40 mm, and the waist lower part U can be set to 65 to 120 mm. On the other hand, the both side edges of the middle region L are gathered in a shape of ㄈ or a curve so as to follow the circumference of the wearer's legs, and these are the parts where the wearer's legs are inserted. As a result, the pant-type disposable diaper in the unfolded state is formed in a substantially hourglass shape as a whole.

(inner body) The inner body 200 can take any shape, and in the illustrated example, it is a rectangle. As shown in FIGS. 3 to 5 , the inner body 200 has: a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent member 50 between the top sheet 30 and the liquid-impermeable sheet 11, The inner body 200 is a main body part which has an absorption function. The symbol 40 represents the intermediate sheet (second sheet) that is arranged between the topsheet 30 and the absorbing member 50 in order to make the liquid that has penetrated the topsheet 30 move to the absorbing member 50 quickly, and the symbol 60 represents that in order to prevent excrement from leaking into the Rising gathers 60 protruding from both sides of the inner body 200 so as to be in contact with the wearer's leg circumference.

(top sheet) The top sheet 30 has the property of permeating liquid, for example, a non-woven fabric with or without holes, a perforated plastic sheet, and the like can be mentioned. Moreover, the top sheet 30 may be constituted by a single sheet, or may be constituted by 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.

Both sides of the top sheet 30 may be folded back toward the back side at the side edges of the absorbent member 50 , or may not be folded, but may protrude laterally beyond the side edges of the absorbent member 50 .

For the top sheet 30, for purposes such as preventing positional displacement relative to the back side member, it is desirable to use heat sealing, ultrasonic sealing, such as a bonding means based on raw material welding, or a hot melt adhesive to seal the top sheet 30. It is fixed to the member adjacent to the back side. In the illustrated example, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the portion of the packaging sheet 58 on the surface side of the absorber 56 by a hot-melt adhesive applied to the back of the top sheet 30 .

(intermediate) In order to make the liquid permeated 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 higher than that of the top sheet 30 may be provided. The intermediate sheet 40 is used for the purpose of improving the absorption performance of the absorber by rapidly moving the liquid to the absorber, and preventing the phenomenon of "rewet" of the absorbed liquid from the absorber. The intermediate sheet 40 may also be omitted.

As the intermediate sheet 40, the same raw material as the top sheet 30, or a spunlace nonwoven, a spunbond nonwoven, an SMS nonwoven, a pulp nonwoven, a mixed sheet of pulp and rayon, a point-bonded nonwoven, or a crepe can be exemplified. In particular, the hot air nonwoven fabric is bulky, so it is preferable. For the hot air non-woven fabric, a composite fiber with a core-sheath structure is preferably used. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) with high rigidity is preferred. The mass per unit area is preferably 17 to 80 g/m ² , 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 bulk up the nonwoven fabric, it is preferable to use an eccentric fiber having a non-central core, a hollow fiber, or an eccentric and hollow fiber as the mixed fiber of all or a part of the raw material fiber.

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

The intermediate sheet 40 is desirably bonded to the intermediate sheet 40 by a bonding means based on material welding such as heat sealing, ultrasonic sealing, or a hot melt adhesive for the purpose of preventing positional displacement with respect to the rear member. It is fixed to the member adjacent to the back side. In the illustrated example, the intermediate sheet 40 is fixed to the surface of the portion on the surface side of the absorber 56 in the packaging sheet 58 by the hot-melt adhesive applied to the back surface.

(liquid impermeable sheet) The material of the liquid-impermeable sheet 11 is not particularly limited, and examples thereof include plastic films made of olefin-based resins such as polyethylene and polypropylene, laminated non-woven fabrics in which a plastic film is provided on the surface of non-woven fabrics, and plastic films. Laminated sheets etc. in which non-woven fabrics etc. are overlapped and joined. For the liquid-impermeable sheet 11, it is preferable to use a material having liquid-impermeability and moisture-permeability which is suitable for use from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by mixing an olefin-based resin such as polyethylene or polypropylene with an inorganic filler, forming a sheet, and extending along one axis or two axes is widely used. . In addition to this, as the liquid-impermeable sheet 11, a sheet having liquid-impermeability without using a plastic film can also be used, and such a sheet can achieve liquid-impermeability by using a Non-woven fabrics of microdenier fibers; anti-leakage reinforcement treatment by applying heat or pressure to narrow the pores of the fibers; and coating with superabsorbent resin or hydrophobic resin or water repellent, but in order to use In order to obtain sufficient adhesive strength when adhering to the mask nonwoven fabric 13 described later with a hot melt adhesive, it is desirable to use a resin film.

The liquid-impermeable sheet 11 may be formed so as to be accommodated in the width of the back side of the absorbent member 50 as shown in the figure, and in order to improve leakage resistance, the liquid-impermeable sheet 11 may be wrapped around both sides of the absorbent member 50 and extended to the side of the absorbent member 50 . Both sides of the side of the topsheet 30 . The width of the extension portion is preferably about 5 to 20 mm on the left and right.

(absorbing member) The absorbent member 50 has an absorbent body 56 and a wrapping sheet 58 which covers the entire absorbent body 56 . The packaging sheet 58 can also be omitted.

(Absorber) The absorber 56 may be formed of an aggregate of fibers. As this fiber aggregate, in addition to an aggregate formed by piling up short fibers such as cotton pulp and synthetic fibers, if necessary, a tow (fiber bundle) of synthetic fibers such as cellulose acetate can be used. An aggregate of filaments obtained from fibers. The basis weight of the fibers can be, for example, about 100 to 300 g/m ² in the case of piling cotton pulp or short fibers, and, for example, 30 to 30 g/m 2 in the case of filament aggregates. 120g/m ² degree. The thickness in the case of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of an aggregate of filaments, the filaments may be non-crimped fibers, but are preferably crimped fibers. The crimp degree of the crimped fibers may be, for example, 5 to 75 pieces per 2.54 cm, preferably 10 to 50 pieces, and more preferably about 15 to 50 pieces. In addition, crimped fibers that are crimped uniformly can be used. Preferably, the superabsorbent polymer particles are dispersed and held in the absorber 56 .

The absorber 56 may have a rectangular shape, but as shown in FIG. 7 and the like, if the absorber 56 is also formed in an hourglass shape having a narrower width than the front and rear sides of the front and rear sides in the middle in the front-rear direction, it will absorb Since the fit of the body 56 itself and the standing gathers 60 with respect to the circumference of the leg is improved, it is preferable.

The size of the absorber 56 can be appropriately determined as long as it can cover the front, rear, left, and right of the urination opening. In addition, the symbol 56X represents the full width of the absorber 56 .

(Superabsorbent polymer particles) A part or all of the absorber 56 may contain superabsorbent polymer particles. The superabsorbent polymer particles include "powder" in addition to "particles". As the superabsorbent polymer particles, those used for such disposable diapers can be used as they are, and for example, they remain on the sieve during screening (vibration for 5 minutes) using a standard sieve of 500 μm (JISZ8801-1:2006). It is desirable that the ratio of the particles is 30% by weight or less, and the ratio of the particles remaining on the sieve in the sieving (vibration for 5 minutes) using a standard sieve of 180 μm (JISZ8801-1:2006) is 60%. Particles above % by weight are desirable.

As the material of the superabsorbent polymer particles, it can be used without any particular limitation, but a material having a water absorption amount of 40 g/g or more is preferred. As the superabsorbent polymer particles, there are superabsorbent polymer particles such as starch-based, cellulose-based, and synthetic polymer-based particles, and starch-acrylic acid (salt) graft copolymers and starch-acrylonitrile copolymers can be used. Superabsorbent polymer particles such as saponified products, sodium carboxymethylcellulose cross-linked products, and acrylic acid (salt) polymers. As the shape of the superabsorbent polymer particles, generally used powder or granular forms are preferred, but other shapes may be used.

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

Moreover, as 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 stickiness after liquid absorption can be effectively suppressed.

The mass per unit area of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required according to the application of the absorber 56 . Therefore, it cannot be generalized, but it may be 50 to 350 g/m ² . If the mass per unit area of the polymer is less than 50 g/m ² , it is difficult to secure the absorption amount. When the mass per unit area of the polymer exceeds 350 g/m ² , the effect is saturated.

(Packaging Sheet) In the case of using the packaging sheet 58, tissue paper, particularly crepe paper, nonwoven fabric, composite laminated nonwoven fabric, perforated sheet, etc. can be used as its raw material. However, a sheet in which superabsorbent polymer particles do not come out is desired. 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 materials. Desirable mass per unit area is 5 to 40 g/m ² , particularly 10 to 30 g/m ² .

The packaging method of the packaging sheet 58 can be appropriately determined, but the packaging sheet 58 is preferably surrounded by the surface of the absorber 56 from the viewpoints of ease of manufacture and prevention of leakage of superabsorbent polymer particles from the front and rear edges. and the back and both sides are wound into a cylindrical shape, and the front and rear edges of the absorber 56 are exposed from the front and rear of the absorber 56, and the overlapping parts of the winding and the front and rear are overlapped by bonding means such as hot-melt adhesive and raw material welding. The overlapping portions of the exposed portions are joined.

(stand up wrinkle) The standing gather 60 has a standing portion 68 standing up from the side of the inner body 200. The standing portion 68 contacts the wearer's groin through the leg circumference to the buttocks and prevents lateral leakage. In the raised gather 60 shown in the figure, the root side part 60B is raised diagonally toward the center side in the width direction, and the front end side part 60A is raised diagonally toward the outer side in the width direction from the middle part, but it is not limited to this. Appropriate changes, such as the form in which it stands|starts up to the center side of the width direction as a whole, can be made.

Describing in more detail, the standing gathers 60 of the illustrated example are configured such that the band-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the inner body 200 is wide at the portion that becomes the front end. It is folded and folded in half in the direction WD, and a plurality of elongated gather elastic members 63 are fixed at intervals in the width direction WD in a state of being elongated in the longitudinal direction between the folded portion and the adjacent sheets. Among the standing gathers 60 , the base end portion (the end portion on the opposite side to the sheet folded portion in the width direction WD) located on the opposite side to the front end portion is fixed to the inner body 200 than the inner body 200 . The liquid-permeable sheet 11 is closer to the root portion 65 of the side portion on the back side, and the portion other than the root portion 65 is the main body portion 66 (portion on the folded portion side) protruding from the root portion 65 . Further, the main body portion 66 has a root side portion 60B extending toward the center side in the width direction, and a distal end portion 60A folded back at the distal end of the root side portion 60B and extending outward in the width direction. Furthermore, the both ends of the front and rear directions in the main body portion 66 are the lodging portions 67 that are fixed with respect to the side surface of the top sheet 30 under the lodging state, on the other hand, the middle portion of the front and rear directions between them is not. As for the fixed standing portion 68, the gather elastic member 63 along the front-rear direction LD is fixed to at least the front end portion of the standing portion 68 in an extended state.

In the standing gather 60 configured as described above, the standing portion 68 stands up so as to contact the skin as indicated by the arrow mark in FIG. 3 by the contraction force of the gather elastic member 63 . In particular, when the base portion 65 is located on the back side of the inner body 200, the standing portion 68 at the crotch portion and its vicinity stands up so as to be open to the outside in the width direction, so that the standing gathers 60 are formed in a plane. Touch the leg circumference for improved fit. The root portion 65 can also be fixed to the surface side of the inner body 200 , for example, to the surfaces of both side portions of the top sheet 30 .

Like the standing gathers 60 in the illustrated example, the main body portion 66 is formed from a root portion 60B extending toward the center side in the width direction, and a distal portion 60A folded back at the distal end of the root portion 60B and extending outward in the width direction. In the constructed curved configuration, at the fallen portion 67, the front end side portion 60A and the root side portion 60B are joined together in the fallen state, and the root side portion 60B is joined to the top sheet 30 in the fallen state. At least one of hot-melt adhesives based on various coating methods, and methods based on raw material welding such as heat sealing and ultrasonic sealing can be used for the bonding of the opposing surfaces in the laid-down portion 67 . At this time, the joining of the root side portion 60B and the top sheet 30 and the joining of the distal end portion 60A and the root side portion 60B may be performed by the same means, or may be performed by different means. For example, it is preferable to perform the bonding of the root side portion 60B and the top sheet 30 by a hot melt adhesive, and to perform the bonding of the front end side portion 60A and the root side portion 60B by material welding.

As the gather sheet 62 , a nonwoven fabric that is soft and excellent in uniformity and concealment, such as spunbond nonwoven fabrics (SS, SSS, etc.), SMS nonwoven fabrics (SMS, SSMMS, etc.), meltblown nonwoven fabrics, etc., using silicone or the like as necessary, can be appropriately used A wrinkled sheet made of water repellent treatment. In this case, the basis weight of the fibers of the nonwoven fabric is preferably about 10 to 30 g/m ² . Moreover, like the example shown in FIG. 9, the waterproof membrane 64 can also exist between the gather sheets 62 folded in half.

As the gather elastic member 63, a rubber thread or the like can be used. When using spandex rubber thread, the thickness is preferably 470-1240 dtex, more preferably 620-940 dtex. The elongation in the mounted state of the gather elastic member 63 is preferably 150 to 350%, more preferably 200 to 300%. The number of the pleated elastic members 63 is preferably 2 to 6, more preferably 3 to 5. The arrangement interval of the gather elastic members 63 is suitably 3 to 10 mm. When comprised in this way, it becomes easy to contact skin surfacely in the range in which the gather elastic member 63 is arrange|positioned. The gather elastic member 63 may be arranged not only on the front end side but also on the root side.

At the raised portion 68 of the raised gathers 60 , various coating methods can be used for attaching the inner and outer layers of the gather sheet 62 or for fixing the gather elastic member 63 sandwiched therebetween. At least one of the hot-melt adhesive, and the fixing means based on raw material welding such as heat sealing or ultrasonic sealing. If the inner layer and the outer layer of the gather sheet 62 are adhered over the entire surface, the flexibility will be impaired. Therefore, it is preferable not to adhere or to weakly adhere the portion other than the adhesive portion of the gather elastic member 63 . In the example shown in the figure, the following structure is adopted: the hot-melt adhesive is applied only to the outer peripheral surface of the gather elastic member 63 by applying means such as a comb-shaped spray gun or a rubber band nozzle, and the gather elastic member 63 is sandwiched between Between the inner layer and the outer layer of the gather sheet 62, only the hot-melt adhesive applied to the outer peripheral surface of the gather elastic member 63 is used to perform the gather elastic member 63 with respect to the gather sheet 62. The fixing of the inner layer and the outer layer, and the fixing between the inner layer and the outer layer of the gather sheet 62 .

Likewise, for the fixing of the downed portion 67, at least one of hot melt adhesives based on various coating methods, and means based on raw material fusion such as heat sealing or ultrasonic sealing can be used.

(flank) As shown in FIGS. 3 , 4 , 11 , 13 and 14 , both sides of the inner body 200 are provided with side flaps 70 extending from the side of the absorbent body 56 , preferably the side flaps 70 A side expansion-contraction region SG that expands and contracts in the front-rear direction LD is formed. The side flap 70 of the illustrated example has one or a plurality of elongated side elastic members 73 provided along the front-rear direction LD, or a plurality of elongated side elastic members 73, a first sheet layer 71 facing the outer side of the side elastic members 73, and a surface facing the side elastic members 73. The second sheet layer 72 on the inner side of the side elastic member 73 .

The sheet material constituting the first sheet layer 71 and the second sheet layer 72 is not particularly limited, and an appropriate nonwoven fabric such as the nonwoven fabric used for the aforementioned standing gathers 60 and the aforementioned exterior bodies 12F and 12B can be selected. In the example shown in FIGS. 3 , 4 and 11 , the first sheet layer 71 and the second sheet layer 72 are formed by extending the gather sheet 62 of the raised gathers 60 , which will be described later. At this time, the front and rear ends of the side flaps 70 coincide with the front and rear ends of the standing gathers 60 (that is, the front and rear ends of the inner body 200 in this case).

The side elastic member 73 is also not particularly limited, and an elongated elastic member similar to the aforementioned gather elastic member 63 can be used. The elongation of the side elastic member 73 in the attached state is preferably 150 to 350%, and more preferably 200 to 270%. The number of the side elastic members 73 is preferably 2 to 16, more preferably 6 to 10. The arrangement interval of the side elastic members 73 is suitably 5 to 10 mm.

The side elastic members 73 are fixed to the first sheet layer 71 and the second sheet layer 72 . For the lamination of the first sheet layer 71 and the second sheet layer 72, or the fixation of the side elastic members 73 sandwiched therebetween, a hot melt adhesive HM based on various coating methods, heat sealing, and ultrasonic sealing can be used. etc. Based on the fixing means of raw material welding. If the bonding area between the first sheet layer 71 and the second sheet layer 72 is large, flexibility is impaired, so it is preferable not to bond or to bond the portion other than the adhesive portion of the side elastic member 73 weakly. In the example shown in the figure, the configuration is as follows: by applying means such as a comb-shaped spray gun or a rubber band nozzle, the hot-melt adhesive HM is applied only to the outer peripheral surface of the side elastic member 73 and the side elastic member 73 is sandwiched therebetween. Between the first sheet layer 71 and the second sheet layer 72 , the side elastic member 73 is relative to the first sheet layer by using only the hot melt adhesive HM coated on the outer peripheral surface of the side elastic member 73 . 71 and the second sheet layer 72 are fixed, and the first sheet layer 71 and the second sheet layer 72 are fixed.

The attachment range of the side elastic member 73 in the front-rear direction, that is, the range in the front-rear direction in which the side expansion-contraction region SG is formed can be appropriately determined, and it is preferable to set it to be the same as the range in the front-rear direction of the non-joining portion 77 to be described later. , or a wider range. Moreover, it is preferable that the range in the front-rear direction of the side expansion-contraction area|region SG is the same as the shrinking part by the gather elastic member which raises gathers, or it is extended to the front-back both sides rather than this shrinking part.

The side flaps 70 preferably have three or more sheet layers, and the three or more sheet layers include a first sheet layer 71 and a second sheet layer 72 . That is, in addition to the innermost sheet layer 74 and the outermost sheet layer 75, it is preferable to have at least one layer between the innermost sheet layer 74 and the outermost sheet layer 75 of the inner sheet 76. A part or all of these sheet layers may be formed using separate sheets, or may be formed by folding one sheet once or more. The inner sheet layer 76 can be appropriately selected from the aforementioned gather sheet 62, the liquid-impermeable sheet 11, or the same nonwoven fabrics as the outer casings 12F and 12B described later. , or the liquid-impermeable sheet 11 is appropriately extended, folded, or the like.

The side flaps 70 preferably have a non-joining portion 77 that is located between at least one of the innermost sheet 74 and the outermost sheet 75 and the inner side of the sheet overlapping the at least one sheet. Sheets 76 are not joined. In addition, the non-joining portion 77 is a continuous or intermittent portion in the front-rear direction LD in the range of the width direction WD including the region between the side elastic member 73 located most laterally and the side edge of the side flap 70 . That is, in the non-joining portion 77, either the innermost sheet layer 74 or the outermost sheet layer 75 is not bonded to the inner sheet layer 76 on the back side of the sheet layer overlapped with either of the sheet layers. Part or all of the layers other than the non-joining portion 77 may be joined, and all the sheet layers in the thickness direction may be non-joined. For example, in the non-joining portion 77 of the example shown in FIGS. 3 , 4 and 11 , the innermost sheet 74 and the inner sheet 76 overlapping the innermost sheet 74 are non-bonded. The part is from the side edge to the fixing position of the most lateral side elastic member 73; , it is more continuous to the center side in the width direction than the fixing position of the most lateral side elastic member 73 . Although not shown, in the non-joining portion 77, the innermost sheet 74 and the non-joining portion of the inner sheet 76 overlapping the innermost sheet 74, and the outermost may be The non-joint portion of the sheet layer 75 and the inner sheet layer 76 that overlaps the inner side of the outermost sheet layer 75 is more continuous from the side edge to the fixed position of the side elastic member 73 at the outermost side to the width. The former is more continuous to the center side in the width direction.

The dimension in the width direction WD of the non-joining portion 77 can be appropriately determined, but is preferably 2 to 15 mm, and particularly preferably 5 to 10 mm. Moreover, it is preferable that the dimension of the front-back direction LD of the non-joining part 77 is 30% or more of the total product length Y, and it is especially preferable that it is 40% or more of the total product length Y. In addition, in the case where the front side exterior body 12F and the rear side exterior body 12B are separate trousers-type disposable wearing articles as shown in the figure, it is preferable that the non-joining portion 77 extends to the front side exterior body 12F, respectively. A position overlapping with the rear exterior body 12B. In this case, it is preferable that the non-joining portion 77 extends over the entire front-rear direction LD of the inner body 200 . In addition, the non-joining portion 77 extends only to the positions of the front and rear edges of the inner body 200 and to the elastic members 16 and 19 on the most leg opening LO side of the front outer body 12F and the rear outer body 12B. The location in between is also better. Further, the non-joining portion 77 may extend only to the elastic members 16 and 19 on the most leg opening LO side of the front side exterior body 12F and the rear side exterior body 12B and the edge of the leg opening LO (the rear side of the front side exterior body 12F). edge and the front edge of the rear exterior body 12B).

In addition, on both sides in the width direction WD of the non-joining portion 77, at least one of the innermost sheet layer 74 and the outermost sheet layer 75 and the inner sheet layer 76 overlapping the back surface of the at least one sheet layer The gap between is closed. As shown in the figure, one side of the gap of the non-joining portion 77 can be closed by folding back the sheet constituting the innermost sheet layer 74 or the outermost sheet layer 75 at the side edge of the side flap 70 . The other side of the gap of the portion 77 can be closed by joining the adjacent sheet layers in the thickness direction at an appropriate place by using a hot melt adhesive HM, a welding means, or the like. Of course, both sides of the gap of the non-joining portion 77 can also be closed by the same method, for example, by folding back the sheet or the hot melt adhesive HM.

In this pant-type disposable diaper, the side flaps 70 are contracted in the front-rear direction LD along with the contraction of the side elastic members 73, and as shown in FIG. That is, the folds of the side expansion-contraction region SG included in the part of the non-joint portion 77 in the side flap 70 are formed side by side in the front-rear direction LD. Here, the non-joining portion 77 is a portion where at least one of the innermost sheet layer 74 and the outermost sheet layer 75 and the inner sheet layer 76 overlapping the back surface of the at least one sheet layer are not joined, and the sheet layer The gap therebetween is closed on both sides in the width direction WD of the non-joining portion 77 . In addition, the non-joining portion 77 is in the width direction WD range (the same width as this area or the width direction WD range beyond this area) including the area between the most lateral side elastic member 73 and the side edge of the intermediate area L , continuous in the front-back direction LD. That is, the hollow portion 80 surrounded by the sheet layer in the non-joining portion 77 is continuous in the front-rear direction LD. As a result, the folds formed in the non-joint portion 77 are formed by at least one of the innermost sheet layer 74 and the outermost sheet layer 75, which are swollen up, so that they are very soft (that is, they are rich in cushioning properties). ) of the folds. Therefore, since the very soft folds are formed in the inner side, outer side, inner and outer sides, or the entire thickness direction of the range including the side edges of the side flaps 70, the skin feel of the edge of the leg opening LO becomes good.

The side elastic member 73 may be located in the vicinity of the side edge of the side flap 70, but is preferably a portion of the side flap 70 that is 2 to 15 mm (especially 5 to 10 mm) on the central side in the width direction WD from the side edge. The side elastic member 73 is not included, and a part or all of the non-engaging portion 77 is included. In this way, if the side elastic members 73 are sufficiently spaced from the side edges of the side flaps 70, and the spaced portion includes a part or all of the non-engagement portion 77, when the product is held during wearing or purchasing, or when Large folds that are rich in flexibility and cushioning are formed in the entire thickness direction of the side of the portion that presses the skin during wearing (that is, the portion having the side elastic members 73 ), so that the skin at the end of the leg opening LO is improved. It feels great.

The positional relationship between the non-engaging portion 77 and the side elastic members 73 can be appropriately determined. However, if there is at least one side elastic member 73 at a position overlapping the non-engaging portion 77 in the thickness direction, the shrinkage of the side elastic member 73 is caused by the example shown in the figure. The force is directly applied to the non-joining portion 77, so that the shape retention of the fold in the non-joining portion 77 becomes high, which is preferable.

In the non-joining portion 77, the inner sheet 76 overlapping the innermost sheet 74 or the inner sheet 75 of the outermost sheet 75 may be fixed to the adjacent sheet on the opposite side, Particularly preferred is an inner sheet 76 as shown in FIG. 11, which is non-fixed with respect to adjacent sheets on both sides in the thickness direction. Thereby, independent folds are also formed in the inner sheet layer 76 by the contraction force of the side elastic members 73 . That is, since the large folds formed in the side flaps 70 are supported by the folds of the inner sheet layer 76 formed independently, the side flaps 70 can be formed with more excellent cushioning folds.

As shown in the figure, the side flap 70 has a folded sheet layer folded back at the side edge of the side flap 70, and if at least one of the innermost sheet layer 74 and the outermost sheet layer 75 of the side flap 70 is sandwiched by the folded sheet layer The portion on one side of the folded-back position is preferable because the cushioning properties of the folds formed in the non-joint portion 77 are particularly improved by the restoring force for the folded-back. In addition, the folded sheet layer refers to a pair of layers formed by the folding of the sheet.

A preferred example is the structure shown in FIG. 11 . This side flap 70 is folded back at the side edge, and has the folded-back sheet layer of 2 layers. In addition, the innermost sheet 74 and the outermost sheet 75 of the non-joining portion 77 are respectively an inner portion and an outer portion to sandwich the folding position of the outer folded sheet. The inner sheet 76 includes an inner portion and an outer portion to sandwich the folded position of the inner folded sheet. Further, the first sheet 71 and the second sheet 72 respectively include an inner portion and an outer portion, the inner portion sandwiching the inner portion at the bending position of the inner folded sheet, and the outer portion sandwiching the inner portion at the folded position. The outer part of the folding position of the outer folded sheet. Further, the non-joining portion 77 includes a portion outside the folded position sandwiching the folded sheet layer located on the outside and the outside portion of the folded position sandwiching the folded sheet layer located on the inside, and is not joined. In this structure, by arranging the folded sheets in two layers, two folded sheets can be formed in addition to the first sheet layer 71 and the second sheet layer 72, and each layer has a restoring force against folding, so that the side flaps can be The folds with more excellent cushioning are formed with fewer sheets in the side portion of 70 .

In such an example, when the non-joining portion 77 has a four-layer structure, as in the example shown in FIG. 11 , it is preferable to construct the side flaps 70 using the sheet of the raised gathers 60 . That is, the folded-back sheet layer of the aforementioned side flap 70 can be formed by the first part P1 and the second part P2 which is the two-layer structure of the sheet of the standing gathers 60 from the starting point of the standing gathers 60 The second portion P2 is formed by extending to the side edge of the side flap 70, and the second portion P2 is formed by folding back the side edge of the side flap 70 and extending to the center side in the width direction WD with the two-layer structure of the sheet of the raised gathers 60.

In the example shown in FIGS. 9 and 10 , the side flaps 70 can also be omitted.

(inner and outer joint) The fixing of the inner body 200 to the outer bodies 12F and 12B can be performed by a joining means based on material welding such as heat sealing and ultrasonic sealing, or a hot melt adhesive. In the illustrated example, the back surface of the inner body 200 (that is, the back surface of the liquid-impermeable sheet 11 and the back surface of the root portion 65 of the raised gathers 60 in this case) is adhered via a hot melt adhesive. It is fixed to the inner surface of the exterior bodies 12F and 12B. The inner body 200 and the outer bodies 12F and 12B are fixed together with the inner and outer joints 20, as shown in FIG. Parts other than both ends in the width direction.

(exterior body) The exterior bodies 12F and 12B are composed of a rectangular front exterior body 12F, which constitutes at least the waist circumference of the front body F, and a rectangular rear exterior body 12B, which constitutes at least the waist circumference of the rear body B. , the front-side exterior body 12F and the rear-side exterior body 12B are discontinuous on the crotch side and spaced apart in the front-rear direction LD (exterior two-division type). The separation distance 12d in the front-rear direction can be, for example, about 40 to 60% of the full length Y. In the illustrated example, the lower edges of the front-side exterior body 12F and the rear-side exterior body 12B are linearly formed along the width direction WD, but the lower edges of at least one of the front-side exterior body 12F and the rear-side exterior body 12B It can also be made into a curved shape along the leg circumference.

In the pant-type disposable diaper of the outer casing split type, since the inner body 200 is exposed between the front outer body 12F and the rear outer body 12B, it is preferable not to expose the liquid-impermeable sheet 11 to the outer body. The back side of the inner body 200 is provided with a mask non-woven fabric 13 that extends from between the front side outer body 12F and the inner body 200 to the rear side outer body 12B and the back side of the inner body 200 from between the front side outer body 12F and the inner body 200 . Between the inner body 200 . The inner surface and the outer surface of the mask non-woven fabric 13 can be adhered to the respective opposite surfaces by hot melt adhesive. For the nonwoven fabric used for the mask nonwoven fabric 13, the same material as that of the exterior bodies 12F and 12B can be appropriately selected. In addition, although not shown in the figure, the exterior body may be continuous from the front body F to the rear body B through the crotch. At this time, the exterior body has not only a portion corresponding to the waist region T but also a portion corresponding to the intermediate region L.

The front side exterior body 12F and the side exterior body rear 12B have a waistline portion on the front side and a waistline portion on the rear side that constitute the waistline region T. 1 and 2, as shown in FIG. 7, the front-side exterior body 12F and the rear-side exterior body 12B have the same front-rear dimension LD, and the front-side exterior body 12F and the rear-side exterior body 12F are the same. The body 12B does not have a portion corresponding to the intermediate area L, but as shown in FIG. 8 , the rear-side exterior body 12B may have a front-rear dimension longer than the front-side exterior body 12F, and may be covered on the front side. The body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a buttocks cover portion C extending from the waistline region T toward the intermediate region L side. Although not shown in the figure, the front side exterior body 12F may also be provided with a groin cover portion that protrudes from the waist region T to the middle region L side.

As shown in FIGS. 4 and 5 , the outer casings 12F and 12B are formed by joining the outer sheet layer and the inner sheet layer to an adjacent elastic member 16 , which will be described later, by joining means such as hot-melt adhesive and welding, respectively. Inside and outside of ~19. The outer sheet layer and the inner sheet layer may be formed of two sheets 12S and 12H as shown in the example, but may also be formed of one sheet 12S. For example, in the case of the latter, a part or all of the front side exterior body 12F and the rear side exterior body 12B can be folded back at the edge of the waist opening WO (may be the edge on the crotch side). The inner and outer portions of the sheet 12S form the inner and outer sheets, respectively. The illustrated example is an example of the former in which the sheet 12S forming the outer sheet in the waist lower portion is wound around and folded back to the edge on the waist opening WO side of the sheet 12H forming the inner sheet in the waist lower portion. On the inner side, the folded portion 12r extends and covers the end portion of the inner body 200 on the side of the waist opening WO. On the other hand, in the waist portion, the turned-back portion 12r becomes an inner side sheet adjacent to the inner side of the elastic member.

The outer casings 12F and 12B are formed with elastic members 16 to 19 in order to improve the fit to the waist of the wearer, thereby forming a stretchable region A2 that can be expanded in the width direction as the elastic members 16 to 19 expand and contract. Elastic scaling on WD. In this expansion-contraction area A2, in the state of the natural length, the exterior bodies 12F and 12B are contracted with the contraction of the elastic member, and wrinkles or folds are formed, and when they are extended in the longitudinal direction of the elastic member, the outer casings 12F and 12B can be It is stretched to a specified elongation rate that is fully stretched without wrinkling. The elastic members 16 to 19 are not particularly limited, and conventional elastic members such as belt-shaped, mesh-shaped, and film-shaped can be used in addition to elongated elastic members such as rubber threads (illustration examples). As the elastic members 16 to 19, synthetic rubber or natural rubber may be used.

If the elastic members 16 to 19 of the illustrated example will be described in more detail, the waist portions W of the exterior bodies 12F and 12B are attached at intervals in the front-rear direction so as to be continuous over the entire width direction WD. A plurality of waist elastic members 17 are provided. In addition, one or a plurality of the waist elastic members 17 arranged in the region adjacent to the lower waist portion U may overlap the inner body 200 or may overlap the inner body 200 in the width direction. Except for the central part, they are respectively arranged on both sides in the width direction. As the waist elastic member 17, about 2 to 15 pieces are provided at intervals of 2 to 12 mm, particularly preferably about 3 to 7 mm, and the thickness is 155 to 1880 dtex, particularly preferably about 4 to 10 pieces. Waist portion W obtained by a rubber thread of about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is about 0.05 to 1.5 mm ² , preferably about 0.1 to 1.0 mm ² ). The elongation in the width direction WD is preferably about 150 to 400%, and particularly preferably about 220 to 320%. In addition, the waist portion W does not need to use elastic members of the same thickness or to have the same elongation in the entire front-rear direction LD. For example, local thicknesses and elongations may be different.

In addition, it is preferable to attach a plurality of waist lower elastic members 16 and 19 composed of elongated elastic members at intervals in the front-rear direction to the waist lower parts U of the exterior bodies 12F and 12B to form the waist. Lower stretch area (area with waist lower elastic members 16, 19). The lower waist elastic members 16 and 19 are preferably provided at intervals of 1 to 15 mm, particularly preferably at intervals of 3 to 8 mm, in about 5 to 30 thicknesses of 155 to 1880 dtex, particularly preferably 470 to 1240 dtex. (In the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is about 0.05 to 1.5 mm ² , particularly preferably about 0.1 to 1.0 mm ² ) rubber thread, and the waist lower part U obtained by this is in the width direction. The elongation in WD is preferably about 200 to 350%, and particularly preferably about 240 to 300%. In addition, the waist lower part U does not need to use elastic members of the same thickness or to have the same elongation in the entire front-rear direction LD. For example, local thicknesses and elongations may be different.

In the case where the elastic members 16 and 19 are preferably provided in the front-rear direction with the absorber 56 as in the waist lower portion U of the illustrated example, in order to prevent the absorber 56 from being in the width direction in a part or all of the range The shrinkage in WD, as shown in FIG. 4, FIG. 5, FIG. 12, etc., will include a part or all of the portion overlapping the absorber 56 in the width direction WD in the middle of the width direction (preferably including the entire inner and outer joints). 20) It is set as a non-stretchable area A1, and the both sides in the width direction are set as an expansion-contraction area A2 (in the example of the figure, it becomes an expansion-contraction area under the waist). The size in the width direction of the stretchable area A2 provided on both sides of the non-stretchable area A1 in the width direction is not only a fixed size in the front-rear direction LD as shown in the figure, although not shown in the figure. is the dimension changed in the front-rear direction LD. Moreover, the dimension of the width direction of the expansion-contraction area|region A2 provided on both sides of the width direction of the non-expandable area A1 may be the same or different in the front body F and the rear body B.

The stretchable region A2 and the non-stretchable region A1 can be configured by supplying the elastic members 16 to 17 and 19 between the inner sheet and the outer sheet, and only in the portion located in the stretchable region A2, After fixing the elastic members 16 and 19 with a hot melt adhesive, the elastic members 16 and 19 are separated by pressing and heating or cutting them at a place in the middle in the width direction in the region that becomes the non-stretchable region A1. 19 is cut; or in the part located in the stretchable region A2 and the region that becomes the non-stretchable region A1, after the elastic members 16 and 19 are fixed by hot melt adhesive, in the region that becomes the non-stretchable region A1, by Substantially the entire elastic members 16 and 19 are finely cut by pressurization and heating, or cutting, so that the stretchability is retained in the stretchable area A2, and the stretchability is eliminated in the non-stretchable area A1.

Further, in the non-stretchable region A1, the elastic member 18 which is not substantially useful for the formation of stretchability remains. In addition, in these methods of cutting the elastic member, a cutting hole formed through at least one of the inner sheet layer and the outer sheet layer in the thickness direction is used as a part or all of the cutting hole according to the pressure conditions and the heating conditions. Broken traces 12x. The shape of the cutting hole is determined by the shape of the cutting protrusion, and in the case of the illustrated example, it is formed into a slit shape. In addition, there is known a cutting method in which the elastic members 16 and 19 are cut together with the inner sheet and the outer sheet by a cutting roller having a large number of fine cutting blades on the outer peripheral surface. In this cutting method, the Slit-shaped cutting holes are inevitably formed as cutting marks 12x.

The sheets 12S and 12H that form the inner sheet layer and the outer sheet layer are not particularly limited, but preferably a nonwoven fabric can be used. In the case of using a nonwoven fabric, the mass per unit area is preferably about 10 to 30 g/m ² .

The elastic members 16 to 19 are fixed to the exterior bodies 12F and 12B at least at both ends of the expansion-contraction region A2 by the hot-melt adhesive HM applied by various coating methods. The inner sheet layer and the outer sheet layer are preferably joined by the hot melt adhesive HM for fixing the elastic members 16 to 19 in the portions each having the elastic members 16 to 19; Part 19 may be joined by hot melt adhesive HM, or by means of material welding such as heat sealing or ultrasonic sealing, or a part or all of them may be joined. For example, in the parts of the outer casings 12F and 12B having the elastic members 16 to 19 , only the outer peripheral surfaces of the elastic members 16 to 19 are coated with hot melt adhesive by coating means such as a comb-shaped spray gun or a rubber band nozzle. The elastic members 16 to 19 are bonded to the elastic members 16 to 19 only by the hot melt adhesive HM applied to the outer peripheral surfaces of the elastic members 16 to 19 by using the bonding agent HM and sandwiching the elastic members 16 to 19 between the sheet layers. The fixation relative to the two sheets, and the fixation between the two sheets.

(Stretching properties of the lower part of the waist) Hereinafter, the expansion-contraction characteristic of the waist lower part U is demonstrated in detail. That is, as shown in FIGS. 13 to 15 , the expansion-contraction region A2 of the waist lower portion U in the front waistline portion is composed of a first region U1 located in the middle of the front-back direction LD, and a waist opening located in the first region U1 The second area U2 on the WO side and the third area U3 located on the leg opening LO side than the first area U1 are constituted. The first region U1, the second region U2, and the third region U3 are regions in which a plurality of waist lower elastic members 19 are arranged at intervals in the front-rear direction LD, respectively; and the first region U1 is a region for each waist The contraction force at the time of extension in the width direction WD of the lower elastic member 19 is a region of 1.1 to 2.0 times (more preferably 1.1 to 1.5 times) of the second region U2 and the third region U3.

In addition, the expansion-contraction region A2 of the waist lower portion U in the rear waistline is composed of a fourth region U4 located in the middle of the front-rear direction, a fifth region U5 located on the waist opening WO side of the fourth region U4, and The fourth area U4 is further formed by the sixth area U6 on the side of the leg opening LO. The fourth region U4, the fifth region U5, and the sixth region U6 are regions in which a plurality of waist lower elastic members 16 are arranged at intervals in the front-rear direction LD, respectively; and the fourth region U4 is for each waist The shrinkage force of the lower elastic member 16 during extension in the width direction WD is a region 1.1 to 2.0 times that of the fifth region U5 and the sixth region U6.

Further, the first region U1 and the fourth region U4 have cylindrical portions 12C that are joined together in the waistline direction; the cylindrical portion 12C is only in the waistline portion on the front side, and has a gap between the falling portion 67 and the standing portion 68 on the front side. The borders 69 overlap and each has at least one lower waist elastic member 19 on the side closer to the waist opening WO and the side closer to the leg opening LO than the border 69 . As shown in FIG. 16 , the front waistline portion and the rear waistline portion may overlap the borders 69 of the front and rear folded portions 67 and the upright portions 68, respectively, and may be positioned more than the borders 69. Each of the waist opening side WO and the leg opening LO side has at least one lower waist elastic member 16 , 19 . In addition, although not shown, it is also possible to overlap the boundary 69 between the fallen portion 67 and the rising portion 68 on the rear side only at the waist portion on the rear side, and on the side of the waist opening WO and on the side of the waist opening WO rather than the boundary 69 . Further on the leg opening LO side, each has at least one under-waist elastic member 16 . The size of the cylindrical portion 12C can be appropriately determined, and can be set to about 5 to 15 times the size of the waist region T in the front-rear direction, for example. In addition, the number of the lower waist elastic members located in the tubular portion 12C is not particularly limited, but is preferably about 3 to 6 in the front waist portion and the rear waist portion, respectively.

The magnitude relationship between the contraction forces of the elastic members 16 and 19 under the waist during elongation can be achieved by attaching elastic members with different materials and elongation rates to the first region U1 to the sixth region U6, respectively. The elastic members 16 and 19 are made of the same material and elongation, and only the thickness is changed in accordance with each region, thereby facilitating the manufacture and the product shape in the state of natural length (shrinkage state) is also good, So better. For example, assuming that the spandex rubber thread used in almost all products at present is used, the thickness of the elastic members 16 and 19 under the waist in the first region U1 and the fourth region U4 can be set as the second region U2 and the thickness of the elastic members 16 and 19 under the waist. The thickness of the under-waist elastic members 16 and 19 in the third region U3, the fifth region U5 and the sixth region U6 is 1.1 to 2.3 times (more preferably 1.2 to 2.0 times) the thickness.

In this pant-type disposable diaper, the fastening force of the first region U1 and the fourth region U4 of the elastic members 16 and 19 under the waist, respectively, is stronger than that of the waist opening WO side and the leg opening LO side, In addition, the cylindrical portion 12C of the first region U1 and the fourth region U4 that is continuous in the waistline direction overlaps the boundary 69 between the falling portion 67 and the rising portion 68 at at least one of the front waistline portion and the rear waistline portion. , and on the side closer to the waist opening WO and the side closer to the leg opening LO than the boundary 69 , each has at least one lower waist elastic member 16 , 19 . Therefore, since the waist opening WO side and the leg opening LO side of the boundary 69 between the flattened portion 67 and the standing portion 68 of the standing gathers 60 can be strongly fastened locally, the boundary 69 is less likely to have a gap. Moreover, compared with the first area U1, the fastening force of the second area U2 and the third area U3 is weak, and compared with the fourth area U4, the fastening force of the fifth area U5 and the sixth area U6 is weak, Therefore, the balance of the overall wearing feeling is not easily damaged.

In particular, in the trousers-type disposable wearing article of a two-division outerwear type as shown in the figure, since the position where the inner body 200 abuts on the crotch reaches the position between the inner body 200 and the outer body 12F, The distance to the intersecting position of 12B is long, and the inner body 200 is easily shaken from side to side by using the intersecting position as a fulcrum. Therefore, compared with the type of outer casings 12F and 12B which are integrally formed continuously from the front body F to the rear body B, The inner body 200 of the outer casing split type is relatively easy to move in the lateral direction, and as a result, a gap is likely to be generated at the boundary 69 between the falling portion 67 and the rising portion 68 in the standing gathers 60 . Therefore, when applying to a two-division exterior type, the above-mentioned tightening balance of the waist portion is particularly significant.

In addition, the "shrinkage force at the time of extension", as mentioned above, refers to the "shrinkage force when it is stretched to the elastic limit in the width direction and then shrunk to 3/4 of its size". In general pant-type disposable diapers, it is assumed that The state when worn by the wearer who fits the size. Specifically, it can be measured by the following method.

(Measuring method of contractile force at the time of elongation) (a) As shown in FIG. 17( a ), the side seal portion 12A is peeled off, and the both sides of the front side exterior body 12F and the both sides of the rear side exterior body 12B are separated into an expanded state, and then weakened by cold spraying The hot melt adhesive HM of the inner and outer joints 20 is used to remove the inner body 200 from the front side outer body 12F and the rear side outer body 12B. In addition, the 1st area|region U1 - the 6th area|region U6 were cut out from the front side exterior body 12F and the rear side exterior body 12B, and the test piece 14 of each area was produced. (b) The dimension in the width direction between the side seal parts 12A in the test piece 14 (not shown) of natural length is measured with a ruler. Moreover, with respect to the test piece 14, the side seal portion 12A on one side and the side seal portion 12A on the other side are kept parallel to each other, while extending to the elastic limit in the width direction (the expanded state in which the waist expansion-contraction region is flatly expanded without shrinking or slack). , and the dimension d2 in the width direction between the side seal portions 12A in the elastic limit was measured with a ruler. In addition, since the dimension d2 of the latter is the same in all the test pieces 14, it is only necessary to measure any one. (c) In a state where the distance Dc between the chucks is less than the dimension in the width direction between the side seal portions 12A in the test piece 14 of natural length, use one of the chucks (grippers) of the tensile tester. ) C1 clamps one side seal portion 12A of the test piece 14 over the entire front-rear direction LD, and clamps the other side seal over the entire front-rear direction LD with the other jig (gripper) C2 of the tensile testing machine. Section 12A. (d) As shown in FIG. 17( b ), while maintaining the one side seal portion 12A and the other side seal portion 12A in parallel, the distance Dc between the clamps is extended to d2 ( After the elastic limit), the distance Dc between the clips was shortened, the tensile force when the test piece 14 was contracted until the distance Dc between the clips became 3/4 of d2 was measured, and the tensile force was divided by the waist of each test piece 14. The number of built-in lower elastic members is used to obtain the contraction force at the time of elongation in the width direction WD of each waist lower elastic member in each region. (e) In addition, the measurement of the distance Dc between jigs|tools was performed using a gauge.

The lower waist elastic member 19 of the first region U1 and the lower waist elastic member 16 of the fourth region U4 may be provided only on the outer side in the width direction WD than the standing gathers 60, but are preferably as shown in the illustration. The inner body 200 and the outer body 12F and 12B are overlapped with the inner body 20 and the outer body 12F and 12B. The inner body 200 extends to the position overlapping the raised gathers 60 to the center side in the width direction WD. The under-waist elastic member 19 and the under-waist elastic member 16 of the fourth region U4 are provided so as to partially or entirely overlap with the raised gathers 60 . Thereby, the tightening force of the elastic members 16 and 19 under the waist is applied more directly to the sides closer to the waist opening WO and closer to the leg opening LO than the boundary 69 of the falling portion 67 and the standing portion 68 .

Also, when the tightening force in the first area U1 and the fourth area U4 is strong, if the tightening force of the third area U3 and the sixth area U6 located on the side of the leg opening LO is fixed, and the tightening force is appropriately set close to the first area U3 and the sixth area U6 When one of the area U1 and the fourth area U4 is tightened, the tightening on the side of the leg opening LO becomes tight, which may make it difficult for the legs to move. Conversely, when the ease of movement of the legs is emphasized, the tightening of one of the first region U1 and the fourth region U4 becomes loose, and the fit is lowered. Therefore, if the fastening force of the third region U3 and the sixth region U6 is gradually weakened, it is possible to achieve both the fit and the ease of movement of the legs. For example, when this change is made in one stage, as shown in FIG. 15 , the third area U3 and the sixth area U6 can be divided into two areas in the front-rear direction LD, and the small areas U32 and U62 on the leg opening LO side can be divided into two areas. The contraction force in the width direction WD of each of the under-waist elastic members 16 and 19 is set to be greater than the elongation in the width direction WD of each of the under-waist elastic members 16 and 19 in the small regions U31 and U61 on the waist opening WO side. When the contraction force is weaker (for example, the degree of 4/5 to 3/5). Preferably, as shown in FIG. 16 , the tightening force in the third region U3 is not changed, and only the tightening force in the sixth region U6 is changed.

The symmetry of the expansion-contraction characteristics in the front waistline portion and the rear side waistline portion can be appropriately determined. For example, as shown in FIG. 15 , if the position of the edge on the waist opening WO side of the first region U1 and the position of the edge on the waist opening WO side of the fourth region U4 coincide in the longitudinal direction orthogonal to the width direction WD, And the position of the edge on the leg opening LO side of the first region U1 and the position of the edge on the leg opening LO side of the fourth region U4 are aligned in the longitudinal direction orthogonal to the width direction, the tightening force is strong. Since the waist part on the front side and the waist part on the rear side have symmetrical expansion and contraction characteristics, it is suitable to make a product including the structure and arrangement of the inner body 200 that are symmetrical before and after.

On the other hand, in products that attach great importance to the fit to the body surface to a certain extent, it is often desirable to include the structure of the inner body 200 and the asymmetric structure before and after the arrangement. In such a product, as shown in FIG. 16, if the edge on the waist opening WO side of the first region U1 is positioned on the leg opening LO side than the edge on the waist opening WO side in the fourth region U4, and the first region U1 is positioned on the leg opening LO side. When the edge on the leg opening LO side of the region U1 is positioned closer to the leg opening LO side than the edge on the leg opening LO side in the fourth region U4, a better fit can be obtained.

Preferably, the contraction force in the width direction WD of each under-waist elastic member 19 in the first region U1 is the ratio of the contraction force in the width direction WD of each under-waist elastic member 16 in the fourth region U4. 0.9 to 1.1 times, better if equal. In addition, the contraction force of each lower waist elastic member 19 in the width direction WD in the second region U2 is 0.9 of the contraction force in the width direction WD of each lower waist elastic member 16 in the fifth region U5 ~1.1 times, better if equal. In addition, the contractile force when extending in the width direction WD of each waist lower elastic member 19 in the third region U3 is 0.9 of the contracting force when extending in the width direction WD of each waist lower elastic member 16 in the sixth region U6 ~1.1 times, better if equal. Thereby, the tightening force of the lower waist elastic members 16 and 19 is almost equal on the front side and the rear side of the waist circumference, and the waist circumference can be tightened uniformly in the waist circumference direction.

As an example, when the material and elongation of the under-waist elastic members 16 and 19 are all the same, and the elongation is set at 260 to 300%, the thickness of the under-waist elastic members 16 and 19 in each region can be as follows Set as follows. The first area U1: 620～940dtex The second area U2: 4/5 to 1/2 times the first area U1 Small area U32 on the leg opening side in the third area U3: 4/5 to 1/2 times the size of the first area U1 Small area U31 on the waist opening side in the third area U3: 4/5 to 3/5 times the small area U32 Fourth area U4: 620～940dtex Fifth area U5: 4/5 to 1/2 times the fourth area U4 Small area U62 on the leg opening side in the sixth area U6: 4/5 to 1/2 times the fourth area U4 The small area U61 on the waist opening side in the sixth area U6: 4/5 to 3/5 times the small area U62

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

・The "front-rear direction" refers to the direction (vertical direction) indicated by the symbol LD in the drawing, and the "width direction" refers to the direction (left-right direction) indicated by the symbol WD in the drawing, and the front-rear direction is orthogonal to the width direction.

・The "front side" refers to the side that is close to the wearer's skin when worn, and the "back side" refers to the side that is farther from the wearer's skin when worn.

・The "front surface" refers to the surface that is close to the wearer's skin when worn, and the "back surface" refers to the surface that is farther from the wearer's skin when worn.

・"Elongation" refers to the value when the natural length is 100%. For example, the elongation ratio of 200% means the same meaning that the elongation ratio is 2 times.

・The "gel strength" is measured as follows. In 49.0 g of artificial urine (2wt% urea, 0.8wt% sodium chloride, 0.03wt% calcium chloride dihydrate, 0.08wt% magnesium sulfate heptahydrate: and 97.09wt% ion-exchanged water were mixed 1.0 g of superabsorbent polymer was added to the mixture) and stirred with a mixer. The resulting gel was placed in a constant temperature and humidity tank of 40°C x 60% RH for 3 hours and returned to normal temperature, and the gel strength was measured with a curd meter (Curdmeter-MAX ME-500 manufactured by I.techno Engineering). .

・"Mass per unit area" is measured as follows. Preliminarily dry the sample or test piece and place it in a standard state (the temperature of the test site is 23±1°C, and the relative humidity is 50±2%) in a test room or device to make it a constant state. Pre-drying means making a sample or test piece constant in an environment with a temperature of 100°C. In addition, pre-drying does not need to be performed about the fiber whose predetermined moisture regain (water content) is 0.0%. Using a template (100 mm×100 mm) for sample selection, a sample having a size of 100 mm×100 mm was cut out from the test piece in a state of constant weight. Measure the weight of the sample and multiply it by a factor of 100 to calculate the weight per square meter as the mass per unit area.

・"Thickness" is automatically measured under the conditions of a load of 0.098N/ ^cm2 and a pressurized area of ^2cm2 using an automatic thickness measuring device (KES-G5 portable compression measuring program).

・"Water absorption" is measured according to JIS K7223-1996 "Water absorption test method for superabsorbent resin".

・The "water absorption rate" was set as "time to end point" when JIS K 7224-1996 "Water absorption rate test method for superabsorbent resin" was performed using 2 g of superabsorbent polymer and 50 g of physiological saline.

・The "expanded state" refers to a state in which it is not contracted (including various contractions such as contraction by an elastic member) and is relaxed and flat.

・As long as there is no special description, the dimensions of each part refer to the dimensions in the unfolded state, not the natural length state.

・When the environmental conditions of the test and measurement are not described, the test and measurement are carried out in a laboratory or apparatus under standard conditions (the temperature of the test site is 23±1°C, and the relative humidity is 50±2%).

[Industrial Availability] The present invention can be used for all pant-type disposable wearing articles, such as pant-type sanitary napkins, in addition to the above-mentioned pant-type disposable diapers.

11: Liquid impermeable sheet 12A: Side seal 12C: Tubular part 12F: Front exterior body (exterior body) 12B: Rear exterior body (exterior body) 12E: Waist Extension 12S, 12H: Sheet 12r: Return part 12d: separation distance 13: Mask non-woven 14: Test piece 16, 19: Elastic member below waist (elastic member) 17: Waist elastic member (elastic member) 18: Unwanted elastic members (elastic members) 20: Internal and external joints 30: Top sheet 40: middle piece (second piece) 50: Absorption member 56: Absorber 56X: the full width of the absorber 56N: Gathering part 58: Packaging Sheet 60: Stand up pleats 60A: Front end side part 60B: Root side part 62: Ruffled piece 63: Wrinkled elastic member 64: Waterproof membrane 65: Root part 66: Main part 67: Lodging part 68: Erect part 69: Boundaries 70: Flanks 71: The first layer 72: Second layer 73: Side elastic member 74: innermost lamella 75: The outermost lamella 76: Internal lamella 77: Non-joint 80: hollow part 200: Inner body C: Buttocks cover F: predecessor B: back P1: Part 1 P2: Part II HM: hot melt adhesive WO: waist opening LO: leg opening A1: Non-flexible area A2: Retractable area SG: side retractable area T: Waist area L: middle area U: the lower part of the waist W: waist U1: The first area U2: The second area U3: The third area U4: Fourth area U5: Fifth Region U6: The sixth area U31, U32, U61, U62: Small area Y: The full length of the diaper in the unfolded state X: The full width of the diaper in the unfolded state d2: Dimension in the width direction of the side seal in the elastic limit C1, C2: Clamps (Grippers) dc: distance between fixtures LD: length direction WD: width direction

Fig. 1 is a plan view showing the inner surface of a pant-type disposable diaper in an unfolded state. Fig. 2 is a plan view showing the outer surface of the pant-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 sectional view taken along line 4 - 4 in FIG. 1 , and FIG. 5( b ) is a sectional view taken along line 5 - 5 in FIG. 1 . Fig. 6 is a perspective view of a pant-type disposable diaper. 7 is a plan view showing the outer surface of the inner body in a developed state together with the outline of the outer body. 8 is a plan view showing the outer surface of the inner body in a developed state together with the outline of the outer body. FIG. 9 is a cross-sectional view corresponding to another example of the cross-sectional view taken along line 2-2 in FIG. 1 . Fig. 10 is a plan view showing the outer surface of the pant-type disposable diaper in an unfolded state. FIG. 11 is an enlarged view of an important part of FIG. 3 . Fig. 12 is an enlarged plan view of a non-stretchable area portion. FIG. 13 is an enlarged plan view showing the inner surface of the front exterior body. FIG. 14 is an enlarged plan view showing the outer surface of the rear exterior body. 15 is a schematic side view for explaining the positional relationship of the lower waist elastic member. 16 is a schematic side view for explaining the positional relationship of the lower waist elastic member. FIG. 17 is a schematic diagram showing a method of a tensile test.

Domestic storage information (please note in the order of storage institution, date and number) none

Foreign deposit information (please mark in the order of deposit country, institution, date and number) none

12F: Front exterior body (exterior body)

17: Waist elastic member (elastic member)

19: Elastic member below waist (elastic member)

56: Absorber

60: Stand up pleats

63: Wrinkled elastic member

67: Lodging part

68: Erect part

69: Boundaries

70: Flanks

73: Side elastic member

W: waist

U1: The first area

U2: The second area

U3: The third area

LD: length direction

WD: width direction

Claims (8)

A pants-type disposable wearing article, comprising: Waist opening and left and right pair of leg openings; an exterior body having a front waistline and a rear waistline; and, An inner body attached to the outer body so as to extend in the front-rear direction over the front waist portion and the rear waist portion; On both sides of the inner body, there are provided standing gathers so as to contact the wearer's body surface; The above-mentioned standing gathers have a standing portion extending from the waistline portion on the front side to the waistline portion on the rear side through the crotch portion, and a falling portion that is continuous on both front and rear sides of the standing portion and is fixed in a falling state, and an elongated corrugated elastic member arranged at least at the front end of the upright portion along the front-rear direction; The above-mentioned standing portion can expand and contract in the front-rear direction together with the above-mentioned corrugated elastic member; The front waistline portion and the rear waistline portion have a waist portion located at the edge of the waist opening, and a waist lower portion located on the leg opening side than the waist portion; The waist lower part of the front waist part and the rear waist part has at least waist expansion and contraction regions provided on both sides in the width direction; The lower waist elastic region in the front waist portion and the rear waist portion has a built-in elongated waist lower elastic member along the width direction, and can expand and contract in the width direction together with the waist lower elastic member; The pants-type disposable wearing article is characterized by: In the waistline portion on the front side, the lower waist elastic region is composed of a first region located in the middle in the front-rear direction, a second region located on the waist opening side of the first region, and a region located closer to the first region than the first region. Formed by the third area on the side of the leg opening; The first region, the second region, and the third region are regions in which a plurality of the elastic members below the waist are respectively arranged at intervals in the front-rear direction; The first region is a region where the contraction force in the width direction of each of the elastic members below the waist is 1.1 to 2.0 times that of the second region and the third region; In the waistline portion on the rear side, the lower waist elastic region is composed of a fourth region located in the middle of the front-rear direction, a fifth region located on the waist opening side of the fourth region, and a fourth region located closer to the fourth region. Formed by the sixth area on the side of the leg opening; The fourth region, the fifth region, and the sixth region are regions in which a plurality of the elastic members below the waist are respectively arranged at intervals in the front-rear direction; The fourth region is a region where the contraction force in the width direction of each of the elastic members below the waist is 1.1 to 2.0 times that of the fifth region and the sixth region; The aforementioned first region and the aforementioned fourth region have cylindrical portions connected together in the waistline direction; The cylindrical portion overlaps the boundary between the falling portion and the rising portion at least one of the front waistline portion and the rear waistline portion, and is located closer to the waist opening than the boundary. Further on the leg opening side, each has at least one elastic member under the waist. The pants-type disposable wearing article according to claim 1, wherein the lower waist elastic member in the first region and the lower waist elastic member in the fourth region extend toward the center side in the width direction so as to be perpendicular to the waist where the folds overlap, and, Among the regions where the inner body and the outer body overlap, the lower waist elastic member of the first region and the lower waist elastic member of the fourth region, and the portion overlapping the standing gathers, the inner The package body is joined to the aforementioned outer package body. The pants-type disposable wearing article according to claim 1 or 2, wherein each of the third region and the sixth region is stretched in the width direction of each of the elastic members below the waist as they open toward the legs. The stretching force is weakened by one or more stages every other or more. The pants-type disposable wearing article according to any one of claims 1 to 3, wherein the position of the edge on the waist opening side of the first region is the same as the position of the edge on the waist opening side of the fourth region. position, coincident in the longitudinal direction orthogonal to the width direction; and, The position of the edge on the leg opening side of the first region corresponds to the position of the edge on the leg opening side of the fourth region in the longitudinal direction orthogonal to the width direction. The pants-type disposable wearing article according to any one of Claims 1 to 3, wherein the edge on the waist opening side of the first region is located closer to the edge on the waist opening side of the fourth region the aforesaid leg opening side; The edge on the leg opening side of the first region is located closer to the leg opening side than the edge on the leg opening side of the fourth region. The pants-type disposable wearing article according to claim 4 or 5, wherein the contraction force in the width direction of the elastic member under the waist of each of the first regions is the same as that of each of the fourth regions. 0.9 to 1.1 times the contraction force when the elastic member under the waist is stretched in the width direction; The contraction force of each of the aforesaid lower waist elastic members in the width direction in the second region is 0.9 to 1.1 times of the contraction force in the width direction of each of the aforementioned waist lower elastic members in the fifth region; The contraction force of each of the under-waist elastic members in the third region during expansion in the width direction is 0.9 to 0.9 of the contraction force in the width direction of each of the at least one under-waist elastic member in the sixth region. 1.1 times. The pants-type disposable wearing article according to any one of Claims 1 to 6, wherein all the aforementioned elastic members below the waist have the same material and elongation; The thickness of the elastic member under the waist in the first region and the fourth region is the thickness of the elastic member under the waist in the second region and the third region and the fifth region and the sixth region. 1.1 to 2.3 times. The pants-type disposable wearing article according to any one of claims 1 to 7, wherein the outer body includes a front outer body and a rear outer body, and the front outer body constitutes at least the waistline of the front body part, the rear outer body constitutes at least the waistline of the rear body; Joining the two sides of the aforementioned front side exterior body and the aforementioned two sides of the aforementioned rear side exterior body respectively together to form a side seal portion; The front-side exterior body and the rear-side exterior body are not continuous on the crotch side, but are separated in the front-rear direction.

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