WO2022138106A1

WO2022138106A1 - Pants-type disposable wearable article

Info

Publication number: WO2022138106A1
Application number: PCT/JP2021/044697
Authority: WO
Inventors: 彩草野
Original assignee: 大王製紙株式会社
Priority date: 2020-12-23
Filing date: 2021-12-06
Publication date: 2022-06-30
Also published as: TW202224656A; JP2022099639A; JP7165182B2

Abstract

[Problem] To inhibit gaps in standing gathers. [Solution] 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 wear items

The present invention relates to a pants-type disposable wear item provided with rising gathers.

Pants-type disposable wear items include an exterior body that constitutes at least an annular waist circumference, and an interior body including an absorber that is attached to the exterior body so as to extend from the front body to the back body. In general, a waist opening and a pair of left and right leg openings are formed by joining both side edges of the exterior body and both side edges of the exterior body of the back body to form a side seal (the waist opening and a pair of left and right leg openings are formed). For example, see Patent Documents 1 to 3).

In such pants-type disposable diapers, in order to improve the fit to the body, the exterior body has a laminated structure having a plurality of sheet layers, and various elastic members are attached between the sheet layers in an extended state. In particular, an elongated elastic member along the width direction is placed in the front-rear direction in the waist circumference area defined as the front-back direction range corresponding to the side seal and the intermediate region located between the front-back waist circumference areas. Those attached at intervals and extended in the width direction have a relatively high fit to the body.

In addition, in order to prevent so-called lateral leakage, it is common for pants-type disposable wear items to be provided with rising gathers that rise from both sides in the width direction of the surface. There are various structures of rising gathers, but many rising gathers have the following basic structures. That is, a root portion fixed to the interior body, a main body portion extending from the root portion, and an inverted portion formed by fixing the front end portion and the rear end portion of the main body portion to the surface of the disposable diaper in an inverted state. It has a non-fixed raised portion located between the front and rear inverted portions in the main body portion, and a gather elastic member attached to at least the tip portion of the raised portion along the front-rear direction.

Since the rising gather is provided on the interior body, it is pressed against the wearer's body surface by the exterior body via the interior body. Then, the exterior body is pressed against the wearer's body surface by the elastic member provided on the outer body. As a result, the fit of the rising gather is ensured.

However, in the raised gathers of conventional pants-type disposable wear items, a gap extending in the width direction is generated at the boundary between the inverted portion and the raised portion, and leakage may occur laterally from the raised gather through this gap. rice field.

Japanese Patent No. 5790031 Japanese Unexamined Patent Publication No. 2014-028308 Japanese Unexamined Patent Publication No. 2011-101913

Therefore, the main problem of the present invention is to suppress the occurrence of a gap at the boundary between the lodging portion and the rising portion in the rising gather.

The pants-type disposable wear items that have solved the above problems are as follows.
<First aspect>
Waist opening and pair of left and right leg openings,
An exterior body having a front waist circumference and a rear waist circumference,
It is provided with an interior body attached to the exterior body so as to extend in the front-rear direction over the front waist circumference portion and the rear waist circumference portion.
Rising gathers are provided on both sides of the interior body so as to be in contact with the wearer's body surface.
The rising gathers are a rising portion extending from the front waist circumference portion through the crotch portion to the rear waist circumference portion, a lodging portion that is continuous on both front and rear sides of the rising portion and is fixed in an inverted state, and the rising portion. It has an elongated gather elastic member provided along the front-rear direction at least at the tip of the portion.
The raised portion can be expanded and contracted in the front-rear direction together with the gather elastic member.
The front waist circumference portion and the rear waist circumference portion have a waist portion located at the edge portion of the waist opening and a waist lower portion located on the leg opening side from the waist portion.
The lower waist portion in the front waist circumference portion and the rear waist circumference portion has at least the waist lower expansion and contraction regions provided on both sides in the width direction.
The waist lower elastic region in the anterior waist circumference portion and the posterior waist circumference portion incorporates an elongated lower waist lower elastic member along the width direction, and can be expanded and contracted in the width direction together with the waist lower elastic member. can be,
The waist lower expansion / contraction region in the front waist circumference portion is 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 the legs more than the first region. It consists of a third area located on the opening side.
The first region, the second region, and the third region are regions in which a plurality of elastic members below the waist are arranged at intervals in the front-rear direction.
The first region is a region in which the contraction force during extension in the width direction per elastic member below the waist is 1.1 to 2.0 times that of the second region and the third region.
The waist lower expansion / contraction region in the rear waist circumference portion is more than the fourth region located in the middle in the front-rear direction, the fifth region located on the waist opening side of the fourth region, and the fourth region. It consists of a sixth area located on the leg opening side.
The fourth region, the fifth region, and the sixth region are regions in which a plurality of elastic members below the waist are arranged at intervals in the front-rear direction.
The fourth region is a region in which the contraction force during extension in the width direction per elastic member below the waist is 1.1 to 2.0 times that of the fifth region and the sixth region.
The first region and the fourth region have a tubular portion connected to the waist circumference direction.
The tubular portion overlaps the boundary between the inverted portion and the raised portion on at least one of the front waist circumference portion and the rear waist circumference portion, and the waist opening side and the leg opening from the boundary. Each side has at least one of said lower waist elastic members.
Pants-type disposable wear items that are characterized by that.

(Action effect)
In this pants-type disposable wearable article, the tightening force of the first region and the fourth region having each of a plurality of lower waist lower elastic members is stronger than that of the waist opening side and the leg opening side, and the first region and the fourth region are The tubular portion that continues in the direction of the waist overlaps the boundary between the prone portion and the raised portion on at least one of the front waist circumference and the rear waist circumference, and is on the waist opening side and the leg opening side of the boundary. Each has at least one lower waist elastic member. Therefore, the waist opening side and the leg opening side of the boundary between the inverted portion and the rising portion in the rising gather can be strongly tightened locally, so that a gap is less likely to occur at the boundary. Further, since the tightening force of the second region and the third region is weaker than that of the first region, and the tightening force of the fourth region is weaker than that of the fifth region and the sixth region, the balance of the wearing feeling as a whole is not easily impaired. ..

In addition, "contraction force at the time of extension" means "contraction force when the diaper is expanded to the elastic limit in the width direction and then contracted to the dimension of 3/4 of the elastic limit", and is suitable for general pants-type disposable diapers. It assumes the state when the wearer of the size wears it.

<Second aspect>
The waist lower elastic member in the first region and the waist lower elastic member in the fourth region extend toward the center in the width direction to a position where they overlap with the rising gathers, and
In the region where the interior body and the exterior body overlap, the portion where the waist lower elastic member in the first region, the waist lower elastic member in the fourth region, and the rising gather overlap with the interior body. It is joined to the exterior body,
The pants-type disposable wear item of the first aspect.

(Action effect)
It is preferable to provide the structure of the second aspect because the tightening force of the elastic member below the waist is more directly applied to each of the waist opening side and the leg opening side than the boundary between the inverted portion and the raised portion.

<Third aspect>
In the third region and the sixth region, the contraction force at the time of extension in the width direction per waist lower elastic member is weakened by one step or more every one or more toward the leg opening.
Pants-type disposable wear item of the first or second aspect.

(Action effect)
When the tightening in the first region and the fourth region is strengthened and the tightening force in the third region and the sixth region located on the leg opening side is constant, the tightening closer to the first region side and the fourth region is performed. If this is done properly, the tightening on the leg opening side will be tight and it will be difficult to move the leg. On the contrary, if the ease of movement of the legs is emphasized, the tightening on the side of the first region and the side closer to the fourth region becomes loose, and the fit is deteriorated. Therefore, it is preferable that the tightening force of the third region and the sixth region is gradually weakened as in the present embodiment because both the fit and the ease of movement of the legs can be achieved.

<Fourth aspect>
The position of the edge on the waist opening side of the first region and the position of the edge on the waist opening side of the fourth region coincide with each other in the vertical direction orthogonal to the width direction.
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 with each other in the vertical direction orthogonal to the width direction.
Pants-type disposable wearable article according to any one of the first to third aspects.

(Action effect)
In this embodiment, since the front waist circumference and the rear waist circumference have symmetrical expansion and contraction characteristics in the portion where the tightening is strengthened, the product is symmetrical in terms of front and back including the structure and arrangement of the interior body. Become suitable.

<Fifth aspect>
The waist opening side edge of the first region is located closer to the leg opening side than the waist opening side edge of the fourth region.
The edge of the first region on the leg opening side is located closer to the leg opening side than the edge of the fourth region on the leg opening side.
Pants-type disposable wearable article according to any one of the first to third aspects.

(Action effect)
For example, in a product that emphasizes fit to the body surface, such as a product that is large to some extent, a more asymmetrical structure including the structure and arrangement of the interior body is often desirable. In such a product, as in the present aspect, a more preferable fit is obtained when the first region located on the front waist circumference is located closer to the leg opening side than the fourth region located on the rear waist circumference. be able to.

<Sixth aspect>
The contraction force during extension in the width direction per one elastic member below the waist in the first region is 0.9 to 1 of the contraction force during extension in the width direction per elastic member below the waist in the fourth region. .1 times,
The contraction force during extension in the width direction per one elastic member below the waist in the second region is 0.9 to 1 of the contraction force during extension in the width direction per elastic member below the waist in the fifth region. .1 times,
The contraction force during extension in the width direction per one elastic member below the waist in the third region is 0 of the contraction force during extension in the width direction per at least one elastic member below the waist in the sixth region. It is 9.9 to 1.1 times,
Pants-type disposable wear item according to the fourth or fifth aspect.

(Action effect)
As in this embodiment, the tightening force of the elastic member below the waist is substantially equal on the front side and the rear side of the waist circumference portion, so that the waist circumference portion is evenly tightened in the waist circumference direction, which is preferable.

<Seventh aspect>
All the waist lower elastic members have the same material and elongation rate.
The thickness of the waist lower elastic member in the first region and the fourth region is 1 of the thickness of the waist lower elastic member in the second region and the third region, and the fifth region and the sixth region. .1 to 2.3 times,
Pants-type disposable wearable article according to any one of the first to sixth aspects.

(Action effect)
As in this aspect, by making the material and elongation rate of all lower waist elastic members the same and changing only the thickness according to each region, manufacturing becomes easy and in a state of natural length (contracted state). It is preferable because the product shape is also good.

<Eighth aspect>
The exterior body has a front exterior body that constitutes at least the waist circumference portion of the front body and a rear exterior body that constitutes at least the waist circumference portion of the rear body.
Both sides of the front exterior body and both sides of the rear exterior body are joined to form a side seal.
The front exterior body and the rear exterior body are separated in the front-rear direction without being continuous on the crotch side.
Pants-type disposable wearable article according to any one of the first to seventh aspects.

(Action effect)
As one form of pants-type disposable wearable goods, both sides of the front exterior body and both sides of the rear exterior body are joined by side seals to form a tubular shape, and the front exterior body passes through the crotch part. It is known that an interior body provided over the inner surface of the rear exterior is provided, and the front exterior body and the rear exterior body are separated from each other in the front-rear direction without being continuous on the crotch side. Such an exterior bifurcated type has an advantage that it is not necessary to excise the exterior body in order to form a leg opening, or even if it is excised, a small area is required. That is, since the cut pieces (trims) are disposed of, there is an advantage that waste (trim loss) of the materials can be suppressed.

However, in such an exterior two-piece type, the distance from the position corresponding to the inseam of the interior body to the intersection position between the interior body and the exterior body is long at the time of mounting, so the interior body swings left and right with the intersection position as a fulcrum. Compared to the type that has an integrated exterior body that is continuous from the front body to the back body, the interior body of the exterior two-split type is easier to move laterally toward the crotch side, and as a result, it falls down in the rising gather. A gap is likely to occur at the boundary between the part and the rising part. Therefore, the above-mentioned tightening balance around the waist is particularly significant when applied to the exterior two-piece type.

According to the present invention, it is possible to suppress the occurrence of a gap at the boundary between the lodging portion and the rising portion in the rising gather.

It is a top view which shows the inner surface of the pants type disposable diaper in the unfolded state. It is a top view which shows the outer surface of the pants type disposable diaper in the unfolded state. It is a 2-2 sectional view of FIG. FIG. 3 is a sectional view taken along the line 3-3 of FIG. (A) is a 4-4 cross-sectional view of FIG. 1, and (b) is a 5-5 cross-sectional view of FIG. It is a perspective view of a pants type disposable diaper. It is a top view which shows the outer surface of the interior body in the unfolded state together with the outline of the exterior body. It is a top view which shows the outer surface of the interior body in the unfolded state together with the outline of the exterior body. It is a cross-sectional view of another example corresponding to the 2-2 cross section of FIG. It is a top view which shows the outer surface of the pants type disposable diaper in the unfolded state. It is an enlarged view of the main part of FIG. It is an enlarged plan view of the non-stretchable region portion. It is a top view which shows the inner surface of the front exterior body enlarged. It is an enlarged plan view which shows the outer surface of a rear exterior body enlarged. It is a schematic side view for demonstrating the positional relationship of the elastic member below the waist. It is a schematic side view for demonstrating the positional relationship of the elastic member below the waist. It is a schematic diagram which shows the method of a tensile test.

Below, as an example of pants-type disposable wear items, pants-type disposable diapers will be described in detail with reference to the attached drawings. Each component adjacent to each other in the thickness direction is fixed or joined in the same manner as a known diaper, except for the fixing or joining portions described below. The dotted pattern portion in the cross-sectional view shows an adhesive such as a hot melt adhesive as the fixing or joining means. Hot melt adhesives are known such as slot coating, continuous linear or dotted bead coating, spiral, Z, wavy, etc. spray coating, or pattern coating (transfer of hot melt adhesive by letterpress method). It can be applied by the method. Instead of or in conjunction with this, at the fixed portion of the elastic member, a hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member. Examples of the hot melt adhesive include EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type and the like, but they can be used without particular limitation. As the fixing or joining means for joining each component, a means by welding a material such as a heat seal or an ultrasonic seal can also be used. Where liquid permeability in the thickness direction is required, components adjacent in the thickness direction are fixed or joined in an intermittent pattern. For example, when performing such intermittent fixing or joining with a hot melt adhesive, it is possible to preferably use intermittent pattern coating such as spiral shape, Z shape, and wavy shape, and the range is equal to or larger than the coating width by one nozzle. When applying, it is possible to apply an intermittent pattern such as a spiral shape, a Z shape, or a wavy shape with or without a gap in the width direction. As a joining means for joining each component, a means by welding a material such as a heat seal or an ultrasonic seal can also be used.

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

FIGS. 1 to 6 show an example of a pants-type disposable diaper. This pants-type disposable diaper has a rectangular front exterior body 12F that constitutes the front waist circumference, a rectangular rear exterior body 12B that constitutes the rear waist circumference, and a rear exterior from the front exterior body 12F via the crotch portion. It includes an interior body 200 provided inside the

exterior bodies

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

exterior bodies

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

exterior bodies

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

exterior bodies

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

This pants-type disposable diaper has a waist circumference region T defined as a front-back direction range (a front-back direction range from the waist opening WO to the upper end of the leg opening LO) having a side seal 12A, and a front-back direction range of the portion forming the leg opening LO. It has an intermediate region L defined as (between the front-rear region having the side seal 12A of the front body F and the front-rear region having the side seal 12A of the rear body B). The portion of the front exterior body 12F and the rear exterior body 12B located in the waist circumference region T, that is, the front waist circumference portion and the rear waist circumference portion conceptually forms the edge portion of the waist opening. And, it can be divided into "waist lower part" U1 to U3 and U4 to U6 which are lower parts than this. Normally, when there is a boundary in which the stretching stress in the width direction changes (for example, the thickness and elongation rate of the elastic member change) in the front waist circumference and the rear waist circumference, the boundary on the waist opening WO side is the most. The waist opening WO side becomes the waist portion W, and when there is no such boundary, the waist extending portion 12E extending toward the waist opening WO side from the absorber 56 or the interior body 200 becomes the waist portion W. These lengths in the front-rear direction vary depending on the size of the product and can be appropriately determined. For example, the waist portion W may be 15 to 40 mm and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are constricted in a U-shape or a curved shape along the circumference of the wearer's leg, and this is a portion for inserting the wearer's leg. As a result, the pants-type disposable diaper in the unfolded state has a substantially hourglass shape as a whole.

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

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

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

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

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

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlaced non-woven fabric, spunbonded non-woven fabric, SMS non-woven fabric, pulp non-woven fabric, mixed sheet of pulp and rayon, point-bonded non-woven fabric or crepe paper. In particular, the air-through non-woven fabric is preferable because it is bulky. It is preferable to use a composite fiber having a core-sheath structure for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. The basis weight is preferably 17 to 80 g / m ² , more preferably 25 to 60 g / m ² . The thickness of the raw material fiber of the non-woven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use eccentric fibers having no core in the center, hollow fibers, and eccentric and hollow fibers as mixed fibers of all or a part of the raw material fibers.

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

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

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

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

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

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

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

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

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

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

As the highly absorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less, are preferably used. If the water absorption rate is too slow, so-called reversion, in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56, is likely to occur.

Further, as the highly absorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the bulky absorber 56 is used, the sticky feeling after liquid absorption can be effectively suppressed.

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

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

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

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

More specifically, in the raised gather 60 of the illustrated example, the strip-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 is folded back in the width direction WD at the tip portion and folded in two. Along with stacking, a plurality of elongated gather elastic members 63 are fixed in a stretched state along the longitudinal direction between the folded portion and the sheets in the vicinity thereof at intervals in the width direction WD. The base end portion (the end portion opposite to the sheet folded portion in the width direction WD) located on the side opposite to the tip portion of the rising gather 60 is fixed to the side portion on the back side of the liquid permeable sheet 11 in the interior body 200. The root portion 65 is formed, and the portion other than the root portion 65 is the main body portion 66 (the portion on the folded-back portion side) extending from the root portion 65. Further, the main body portion 66 has a root side portion 60B extending toward the center in the width direction and a tip side portion 60A folded back at the tip of the root side portion 60B and extending outward in the width direction. The both ends of the main body portion 66 in the front-rear direction are in an inverted state and are fixed to the side surface of the top sheet 30, while the intermediate portion in the front-rear direction located between them is not fixed. A gathered elastic member 63 along the front-rear direction LD is fixed to at least the tip of the raised portion 68 in an extended state.

In the rising gather 60 configured as described above, the rising portion 68 rises so as to come into contact with the skin as shown by an arrow in FIG. 3 due to the contraction force of the gather elastic member 63. In particular, when the root portion 65 is located on the back side of the interior body 200, the rising portion 68 stands up so as to open outward in the width direction in the crotch portion and its vicinity, so that the rising gather 60 abuts on the surface around the legs. And the fit will be improved. The root portion 65 can also be fixed to the front side of the interior body 200, for example, the surfaces of both sides of the top sheet 30.

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

The gather sheet 62 is a flexible, uniform and concealing non-woven fabric such as spunbonded non-woven fabric (SS, SSS, etc.), SMS non-woven fabric (SMS, SMSMS, etc.), melt-blown non-woven fabric, etc., and water-repellent with silicone or the like, if necessary. The treated product can be preferably used. In this case, the fiber basis weight of the non-woven fabric is preferably about 10 to 30 g / m ² . Further, as in the example shown in FIG. 9, the waterproof film 64 can be interposed between the gather sheets 62 folded in two.

As the gather elastic member 63, thread rubber or the like can be used. When spandex yarn rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate of the gather elastic member 63 in the attached state is preferably 150 to 350%, more preferably 200 to 300%. The number of gather elastic members 63 is preferably 2 to 6, and more preferably 3 to 5. It is appropriate that the arrangement interval of the gather elastic members 63 is 3 to 10 mm. With this configuration, it becomes easier to hit the skin on the surface within the range in which the gather elastic member 63 is arranged. The gather elastic member 63 may be arranged not only on the tip side but also on the base side.

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

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

(Side flap)
As shown in FIGS. 3, 4, 11, 13, 13, 14, and the like, side flaps 70 extending laterally to the absorber 56 are provided on both sides of the interior body 200, and the sides thereof are provided. It is preferable that the flap 70 is formed with a side expansion / contraction region SG that expands / contracts in the front-rear direction. The side flap 70 of the illustrated example includes one or a plurality of elongated side elastic members 73 provided along the front-rear direction LD and at intervals from each other, and a first sheet facing the outside of the side elastic member 73. It has a layer 71 and a second sheet layer 72 facing the inside of the side elastic member 73.

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

exterior bodies

12F and 12B can be selected. .. In the examples shown in FIGS. 3, 4 and 11, as will be described later, the gather sheet 62 of the rising gather 60 is extended to form the first sheet layer 71 and the second sheet layer 72. In this case, the front and rear ends of the side flap 70 coincide with the front and rear ends of the rising gather 60 (that is, the front and rear ends of the interior body 200 in this case).

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

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

The attachment range of the side elastic member 73 in the front-rear direction, that is, the range in the front-rear direction in which the side expansion / contraction region SG is formed can be appropriately determined, but is the same as or more than the range in the front-rear direction of the non-joint portion 77 described later. It is preferably in a wide range. Further, it is preferable that the range in the front-rear direction of the side expansion / contraction region SG is the same as the contracted portion due to the gather elastic member of the rising gather, or extends to both front and rear sides.

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

exterior bodies

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

It is preferable that the side flap 70 has a non-joined portion 77 in which at least one of the innermost sheet layer 74 and the outermost sheet layer 75 and the inner sheet layer 76 overlapping the innermost sheet layer 76 are not joined. Further, the non-joint portion 77 is a portion that continuously or intermittently continues to the front-rear LD in the range of the width direction WD including the region between the side elastic member 73 located most laterally and the side edge of the side flap 70. Is. That is, as long as either one of the innermost sheet layer 74 and the outermost sheet layer 75 and the inner sheet layer 76 overlapping the back thereof are non-bonded, the non-joining portion 77 is partially or wholly laminated with the other layers. May be joined, or all sheet layers in the thickness direction may be unbonded. For example, in the non-joined portion 77 of the example shown in FIGS. 3, 4 and 11, the portion where the innermost sheet layer 74 and the inner sheet layer 76 overlapping the innermost sheet layer 76 are not joined is the most lateral portion from the side edge. The portion where the outermost sheet layer 75 and the inner sheet layer 76 overlapping the outermost sheet layer 75 are not joined up to the fixed position of the side elastic member continues to the central side in the width direction. Although not shown, in the non-joined portion 77, the innermost sheet layer 74 and the inner sheet layer 76 overlapping the innermost sheet layer 74 are non-joined, and the outermost sheet layer 75 and the inner sheet layer 76 overlapping the back thereof are formed. The non-joined portion extends from the side edge to the center side in the width direction from the fixed position of the most lateral side elastic member, but the former may continue to the center side in the width direction.

The dimension of the WD in the width direction of the non-joined portion 77 can be appropriately determined, but is preferably 2 to 15 mm, particularly preferably 5 to 10 mm. Further, the dimension of the front-rear direction LD of the non-joined portion 77 is preferably 30% or more, particularly 40% or more of the total length Y of the product. Further, in the case of a pants-type disposable wear article in which the front exterior body 12F and the rear exterior body 12B are separated as shown in the illustrated example, the non-joint portion 77 extends to a position where the front exterior body 12F and the rear exterior body 12B overlap each other. Is preferable. In this case, it is preferable that the non-joint portion 77 extends over the entire front-rear direction LD of the interior body 200. Further, the non-joint portion 77 extends only to the position between the front and rear edges of the interior body 200 and the

elastic members

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

elastic members

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

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

In this pants-type disposable diaper, the side flap 70 contracts in the front-rear direction LD with the contraction of the side elastic member 73, and as shown in FIG. 6, the side expansion / contraction region SG is formed in the portion of the side flap 70 including the non-joint portion 77. It is formed. That is, the folds of the side expansion / contraction region SG are formed side by side in the front-rear direction LD in the portion of the side flap 70 including the non-joint portion 77. Here, the non-bonded 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 innermost sheet layer 76 are not bonded, and the gap between the sheet layers is formed. , The non-joint portion 77 is closed on both sides of the widthwise WD. Further, the non-joint portion 77 has a width direction WD range including a region between the side elastic member 73 located most laterally and the side edge of the intermediate region L (the width direction WD equal to or larger than the region). Range) follows the anterior-posterior LD. That is, in the non-joined portion 77, the hollow portion 80 surrounded by the sheet layer continues to the LD in the front-rear direction. As a result, the folds formed on the non-joined portion 77 are formed by a large bulge of at least one of the innermost sheet layer 74 and the outermost sheet layer 75, and are large and soft (that is, rich in cushioning property). Become. Therefore, since the large and soft folds are formed on the inside, outside, both inside and outside, or the entire area including the side edge of the side flap 70 in the thickness direction, the end portion of the leg opening LO is soft to the touch.

The side elastic member 73 may be located near the side edge of the side flap 70, but the portion of the side flap 70 from the side edge to the center side of the WD in the width direction is 2 to 15 mm (particularly 5 to 10 mm). , It is preferable that the side elastic member 73 is not included and a part or all of the non-joint portion 77 is included. As described above, when the side elastic member 73 is sufficiently separated from the side edge of the side flap 70 and the separated portion includes a part or all of the non-joined portion 77, the product is held by hand at the time of mounting or purchasing. The end of the leg opening LO because large folds rich in flexibility and cushion are formed on the entire side in the thickness direction of the part pressed against the skin (that is, the part having the side elastic member 73) when or during wearing. It is particularly preferable to improve the feel of the skin.

The positional relationship between the non-joined portion 77 and the side elastic member 73 can be appropriately determined, but as shown in the illustrated example, when at least one side elastic member 73 is provided at a position overlapping the non-joined portion 77 in the thickness direction. , The contraction force of the side elastic member 73 is directly applied to the non-joint portion 77, and the shape retention of the folds in the non-joint portion 77 is high, which is preferable.

In the non-joined portion 77, the inner sheet layer 76 overlapping the back of the innermost sheet layer 74 or the outermost sheet layer 75 may be fixed to the adjacent sheet layer on the opposite side, but FIG. 11 shows. As shown, it is particularly preferable that the inner sheet layer 76 is not fixed to the sheet layers adjacent to both sides in the thickness direction. As a result, folds are independently formed on the inner sheet layer 76 due to the contraction force of the side elastic member 73. That is, since the greatly bulging folds formed on the side flap 70 are supported by the folds of the inner sheet layer 76 independently formed inside the side flap 70, folds having better cushioning property are formed on the side flap 70. Become so.

As shown in the illustrated example, the side flap 70 has a folded sheet layer folded back at the side edge of the side flap 70, and at least one of the innermost sheet layer 74 and the outermost sheet layer 75 of the side flap 70. Is preferable because the cushioning property of the folds formed in the non-joint portion 77 is particularly improved by the restoring force against the folding back when the folded sheet layer is located on one side of the folded position. The folded sheet layer means a pair of layers formed by folding the sheet material.

One preferable example is the structure shown in FIG. The side flap 70 has a double folded sheet layer folded back at its side edge. The innermost sheet layer 74 and the outermost sheet layer 75 of the non-joined portion 77 are inner and outer parts with the folded position of the folded sheet layer located on the outside, respectively, and are inner sheets. The layer 76 includes an inner portion and an outer portion across the folded position of the folded sheet layer located inside. Further, the first sheet layer 71 and the second sheet layer 72 are an inner portion sandwiching the folding position of the folded sheet layer located inside and an outer portion sandwiching the folding position of the folded sheet layer located outside, respectively. Includes. Further, the non-joining portion 77 is a portion in which the outer portion sandwiching the folding position of the folded sheet layer located outside and the outer portion sandwiching the folding position of the folded sheet layer located inside are not joined. Includes. In this structure, by arranging the double folded sheet layer, two sheet layers other than the first sheet layer 71 and the second sheet layer 72 can be formed, and each of them has a restoring force against the folded back. Therefore, with less sheet material, folds having better cushioning properties will be formed on the side flap 70.

When the non-joint portion 77 has a four-layer structure as in this example, it is preferable to construct the side flap 70 by using the sheet of the rising gather 60 as shown in the example of FIG. That is, in the folded sheet layer of the side flap 70 described above, the first portion P1 formed by the two-layer structure of the seat of the rising gather 60 extending from the starting point of the rising gather 60 to the side edge of the side flap 70, and the rising gather. The two-layer structure of the sheets of 60 can be formed by a second portion P2 that is folded back at the side edges of the side flaps 70 and extends toward the center of the widthwise WD.

The side flap 70 may be omitted as in the examples shown in FIGS. 9 and 10.

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

exterior bodies

12F and 12B by means of joining by material welding such as heat sealing and ultrasonic sealing, or by a hot melt adhesive. In the illustrated example, the back surface of the interior body 200 (that is, the back surface of the liquid impermeable sheet 11 and the back surface of the root portion 65 of the rising gather 60) is attached to the inner surfaces of the

exterior bodies

12F and 12B via the hot melt adhesive. On the other hand, it is fixed. As shown in FIG. 2, the internal / external joints 20 for fixing the interior body 200 and the

exterior bodies

12F and 12B can be provided in almost the entire region where the interior body 200 and the

exterior bodies

12F and 12B overlap, and for example, both ends in the width direction of the interior body 200 can be provided. It can also be provided in the removed part.

(Exterior body)
The

exterior bodies

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

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

exterior bodies

12F and 12B can be appropriately selected. Although not shown, the exterior body may be continuous from the front body F to the back body B through the crotch. In this case, the exterior body has not only a portion corresponding to the waist circumference region T but also a portion corresponding to the intermediate region L.

The front exterior body 12F and the rear exterior body 12B have a front waist circumference portion and a rear waist circumference portion constituting the waist circumference region T. In the examples shown in FIGS. 1 and 2, as shown in FIG. 7, the dimensions of the front-exterior body 12F and the rear-exterior body 12B in the front-rear direction are equal, and the front-exterior body 12F and the rear-exterior body 12B correspond to the intermediate region L. Although it does not have a portion, as shown in FIG. 8, the rear exterior body 12B has a longer anteroposterior dimension than the front exterior body 12F, and the front exterior body 12F does not have a portion corresponding to the intermediate region L. The rear exterior body 12B may have a buttock cover portion C extending from the waist circumference region T to the intermediate region L side. Although not shown, the front exterior body 12F may also be provided with an inguinal cover portion extending from the waist circumference region T to the intermediate region L side.

In the

exterior bodies

12F and 12B, as shown in FIGS. 4 and 5, the outer sheet layer and the inner sheet layer adjacent to the outer and inner sides of the elastic members 16 to 19 described later are joined by hot melt adhesive or welding. It is joined by means. The outer sheet layer and the inner sheet layer are formed by two

sheet materials

12S and 12H as shown in the illustrated example, and can also be formed by one sheet material 12S. For example, in the latter case, in a part or all of the

exterior bodies

12F and 12B, the inner part and the outer part of one sheet material 12S folded back at the edge of the waist opening WO (may be the edge on the crotch side). The inner sheet layer and the outer sheet layer are formed respectively. The illustrated example is an example of the former, and the sheet material 12S forming the outer sheet layer in the lower part of the waist wraps around the waist opening WO side of the sheet material 12H forming the inner sheet layer in the lower part of the waist and enters the inside thereof. It is folded back, and the folded-back portion 12r extends so as to cover the end portion of the interior body 200 on the waist opening WO side. On the other hand, in the waist portion, the folded portion 12r is an inner sheet layer adjacent to the inside of the elastic member.

Elastic members 16 to 19 are built in the

exterior bodies

12F and 12B in order to improve the fit to the wearer's waist circumference, and the elastic members 16 to 19 are elastically expanded and contracted in the width direction WD with the expansion and contraction of the elastic members 16 to 19. Region A2 is formed. In this expansion / contraction region A2, the

exterior bodies

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

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

exterior bodies

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

Further, a plurality of waist lower

elastic members

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

exterior bodies

12F and 12B at intervals in the front-rear direction, and the waist lower expansion / contraction region (waist) is attached. A region having the lower elastic members 16 and 19) is formed. The waist lower

elastic members

16 and 19 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, a cross-sectional area of 0.05 to 1.5 mm ² in the case of natural rubber, especially 0.1 to 1). It is preferable to provide about 5 to 30 thread rubbers (about 0.0 mm ² ) at intervals of 1 to 15 mm, particularly 3 to 8 mm, and the elongation rate of the WD in the width direction of the lower waist portion U by this is 200 to 350%. In particular, it is preferably about 240 to 300%. Further, the waist lower portion U does not need to use elastic members having the same thickness for all of the LDs in the front-rear direction or have the same elongation rate, and the thickness and extension rate may be partially different.

When the

elastic members

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

elastic members

16 and 19. In addition, as shown in FIGS. 4, 5 and 12, etc., the middle width direction (preferably including the entire inner / outer joint portion 20) including a part or all of the portion overlapping the absorber 56 and the width direction WD is not included. It is preferable that the stretchable region A1 and both sides in the width direction are stretchable regions A2 (in the illustrated example, the stretchable region is the lower waist stretchable region). The dimensions of the stretchable region A2 provided on both sides of the non-stretchable region A1 in the width direction are substantially constant in the front-rear direction LD as shown in the illustrated example, and can be changed to the front-rear direction LD (not shown). Further, the dimensions of the widthwise WD of the stretchable region A2 provided on both sides of the widthwise WD of the non-stretchable region A1 may be substantially the same for the front body F and the rear body B, or may be different.

Such the stretchable region A2 and the non-stretchable region A1 supply elastic members 16 to 17 and 19 between the inner sheet layer and the outer sheet layer, and only the portion where the

elastic members

16 and 19 are located in the stretchable region A2. After fixing with hot melt adhesive, the

elastic members

16 and 19 are cut by pressurization and heating or cutting at one place in the middle in the width direction in the region to be the non-stretchable region A1, or the

elastic members

16 and 19 are cut. Is fixed with a hot melt adhesive in the portion located in the stretchable region A2 and the portion to be the non-stretchable region A1, and then almost the entire

elastic members

16 and 19 are pressurized and heated in the region to be the non-stretchable region A1. It can be constructed by cutting finely by cutting and killing the elasticity in the non-stretchable region A1 while leaving the elasticity in the stretchable region A2.

It should be noted that the unnecessary elastic member 18 that does not substantially contribute to the formation of elasticity remains in the non-stretchable region A1. Further, in the cutting method of these elastic members, depending on the pressurizing condition and the heating condition, a part or all of the cutting trace 12x may be a cutting hole penetrating at least one of the inner sheet layer and the outer sheet layer in the thickness direction. May become. The shape of the cut hole is determined by the shape of the cut convex portion, and in the case of the illustrated example, it has a slit shape. Further, a method of cutting the

elastic members

16 and 19 together with the inner sheet layer and the outer sheet layer with a cutting roll having a large number of fine cutting blades on the outer peripheral surface is also known, and this cutting method inevitably has a slit shape. The cut hole will be formed as a cut mark 12x.

The

sheet materials

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

The elastic members 16 to 19 are fixed to the

exterior bodies

12F and 12B at least at both ends of the expansion / contraction region A2 by hot melt adhesive HM by various coating methods. The inner sheet layer and the outer sheet layer are preferably joined by a hot melt adhesive HM for fixing the elastic members 16 to 19 at the portion having the elastic members 16 to 19, respectively, and do not have the elastic members 16 to 19. In the part, it may be bonded by hot melt adhesive HM, it may be bonded by material welding such as heat seal or ultrasonic seal, or it may not be bonded in part or in whole. For example, in the portion of the

exterior bodies

12F and 12B having the elastic members 16 to 19, the hot melt adhesive HM is applied only to the outer peripheral surface of the elastic members 16 to 19 by a coating means such as a comb gun or a sure wrap nozzle to be applied between the sheet layers. By sandwiching the elastic members 16 to 19, the elastic members 16 to 19 can be fixed to both sheet layers and the layers of both sheets can be fixed only by the hot melt adhesive HM applied to the outer peripheral surfaces of the elastic members 16 to 19.

(Stretching characteristics of the lower part of the waist)
Hereinafter, the expansion and contraction characteristics of the lower waist portion U will be described in detail. That is, as shown in FIGS. 13 to 15, the stretchable region A2 of the lower waist portion U in the front waist circumference portion is the waist opening WO side of the first region U1 and the first region U1 located in the middle of the front-rear direction LD. It is composed of a second region U2 located in and a third region U3 located on the leg opening LO side of the first region U1. 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 the waist. The contraction force during extension of the widthwise WD per lower elastic member 19 is 1.1 to 2.0 times (more preferably 1.1 to 1.5 times) that of the second region U2 and the third region U3. It is an area.

Further, the stretchable region A2 of the lower waist portion U in the rear waist circumference portion includes the fourth region U4 located in the middle of the front-rear direction LD, the fifth region U5 located on the waist opening WO side of the fourth region U4, and the fourth region U5. It is composed of a sixth region U6 located on the leg opening LO side with respect to the fourth region U4. 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 the waist. The contraction force during extension of the widthwise WD per lower elastic member 16 is 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 a tubular portion 12C connected to the waist circumference direction, and the tubular portion 12C has only the front waist circumference portion, the front side inverted portion 67 and the rising portion 68. At least one waist lower elastic member 19 is provided on each of the waist opening WO side and the leg opening LO side of the boundary 69. As shown in FIG. 16, both the front waist circumference portion and the rear waist circumference portion overlap the boundary 69 between the front and rear inverted portions 67 and the rising portion 68, and the waist opening WO side and the waist opening WO side from the boundary 69. At least one lower waist

elastic member

16, 19 may be provided on each of the leg openings LO side. Further, although not shown, only the waist circumference portion on the rear side overlaps the boundary 69 between the inverted portion 67 and the rising portion 68 on the rear side, and at least on the waist opening WO side and the leg opening LO side of the boundary 69. It may have one waist lower elastic member 16. The dimension of the tubular portion 12C can be appropriately determined, and can be, for example, about 5 to 15 times the dimension in the front-rear direction of the waist circumference region T. The number of elastic members below the waist located in the tubular portion 12C is not particularly limited, but may be about 3 to 6 in each of the front waist circumference portion and the rear waist circumference portion. preferable.

The magnitude relation of the contraction force at the time of extension of the

elastic members

16 and 19 below the waist can be realized by attaching elastic members having different materials and elongation rates to the first region U1 to the sixth region U6, but all of them. The

elastic members

16 and 19 below the waist have the same material and elongation rate, and by changing only the thickness according to each region, it is easy to manufacture and the product shape in the natural length state (contracted state) is also good. Therefore, it is preferable. For example, assuming the use of spandex yarn rubber currently used in almost all products, the thicknesses of the waist lower

elastic members

16 and 19 in the first region U1 and the fourth region U4 are the second region U2 and the third region U2. The thickness of the lower waist

elastic members

16 and 19 in the region U3, the fifth region U5 and the sixth region U6 can be 1.1 to 2.3 times (more preferably 1.2 to 2.0 times) the thickness. ..

In such a pants-type disposable diaper, the tightening force of the first region U1 and the fourth region U4 having the plurality of lower waist lower

elastic members

16 and 19 is stronger than the waist opening WO side and the leg opening LO side, and The tubular portion 12C in which the first region U1 and the fourth region U4 continue in the waist circumference direction is formed at the boundary 69 between the prone portion 67 and the rising portion 68 on at least one of the front waist circumference portion and the rear waist circumference portion. In addition to overlapping, at least one waist lower

elastic members

16 and 19 are provided on each of the waist opening WO side and the leg opening LO side of the boundary 69. Therefore, since the waist opening WO side and the leg opening LO side of the boundary 69 between the inverted portion 67 and the rising portion 68 in the rising gather 60 can be strongly tightened locally, a gap is less likely to occur at the boundary 69. Further, the tightening force of the second region U2 and the third region is weaker than that of the first region U1, and the tightening force of the fourth region U4 is weaker than that of the fifth region U5 and the sixth region U6. It is hard to lose the balance of.

In particular, in the case of the exterior two-piece type as shown in the illustrated example, the distance from the position corresponding to the inseam of the interior body 200 to the intersection position between the interior body 200 and the

exterior bodies

12F and 12B at the time of mounting is long, so the intersection position is a fulcrum. Because the interior body 200 is easily swung from side to side, the exterior two-piece type interior body 200 is on the crotch side compared to the type equipped with the integrated

exterior bodies

12F and 12B that are continuous from the front body F to the back body B. As a result, it is easy to move laterally, and as a result, a gap is likely to occur at the boundary 69 between the inverted portion 67 and the rising portion 68 in the rising gather 60. Therefore, the above-mentioned tightening balance around the waist is particularly significant when applied to the exterior two-piece type.

In addition, "contraction force at the time of extension" means "contraction force when it is expanded to the elastic limit in the width direction and then contracted to the dimension of 3/4" as described above, and is a general pants type disposable. It is assumed that the diaper is in a state when it is worn by a wearer of suitable dimensions. Specifically, it can be measured by the following method.

(Measurement method of contraction force during extension)
(A) As shown in FIG. 17 (a), the side seal 12A is peeled off to separate both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B, and then cold spray is applied. It is used to weaken the hot melt adhesive HM of the inner / outer joint portion 20 and remove the interior body 200 from the front exterior body 12F and the rear exterior body 12B. Then, the first region U1 to the sixth region U6 are cut out from the front exterior body 12F and the rear exterior body 12B to prepare the test piece 14 in each region.
(B) Measure the dimension in the width direction between the side seals 12A in the natural length test piece 14 (not shown) with a ruler. Further, the test piece 14 is extended in the width direction to the elastic limit (expanded state in which the elastic region around the waistline is flatly expanded without shrinkage or slack) while maintaining the one side seal 12A and the other side seal 12A in parallel. , Measure the width dimension d2 between the side seals 12A at the elastic limit with a ruler. Since the latter dimension d2 is the same for all the test pieces 14, it is sufficient to measure only one of them.
(C) With the distance Dc between chucks set to less than the dimension in the width direction between the side seals 12A of the natural length test piece 14, one side seal 12A of the test piece 14 is stretched over the entire front-rear direction LD. It is sandwiched by one chuck (grasping tool) C1 and the other side seal 12A is sandwiched by the other chuck (grasping tool) C2 of the tensile tester over the entire front-rear direction LD.
(D) As shown in FIG. 17B, the chuck distance Dc becomes d2 (elastic limit) at a tensile speed of 300 mm / min while maintaining one side seal 12A and the other side seal 12A in parallel. After stretching to, the inter-chuck distance Dc was shortened, and the tensile force when the test piece 14 was contracted until the inter-chuck distance Dc became 3/4 of d2 was measured, and this tensile force was measured for each test piece 14. By dividing by the number of built-in waist lower elastic members in each region, the contraction force during extension of the width direction WD per one waist lower elastic member 19 in each region is obtained.
(E) The distance Dc between chucks is measured using a ruler.

The lower waist lower elastic member 19 of the first region U1 and the lower waist lower elastic member 16 of the fourth region U4 may be provided only outside the WD in the width direction with respect to the rising gather 60, but as shown in the illustrated example, The inner / outer joint portion 20 extends toward the center of the WD in the width direction to a position where it overlaps with the rising gather 60, and the inner / outer joint portion 20 is an elastic member below the waist of the first region U1 in the region where the interior body 200 and the

exterior bodies

12F and 12B overlap. It is preferable that the elastic member 16 below the waist of the 19 and the fourth region U4 and the rising gather 60 are provided so as to include a part or all of the overlapping portion. As a result, the tightening force of the lower waist

elastic members

16 and 19 is applied more directly to each of the waist opening WO side and the leg opening LO side than the boundary 69 between the inverted portion 67 and the raised portion 68.

Further, when the tightening in the first region U1 and the fourth region U4 is strengthened, if the tightening force of the third region U3 and the sixth region U6 located on the leg opening LO side is constant, the first region U1 side and the fourth region U6 If the tightening closer to the fourth region U4 is made appropriate, the tightening on the leg opening LO side may become tight and it may be difficult to move the leg. On the contrary, if the ease of movement of the legs is emphasized, the tightening on the side of the first region U1 and the side closer to the fourth region U4 becomes loose, and the fit is deteriorated. Therefore, it is preferable that the tightening force of the third region U3 and the sixth region U6 is gradually weakened because both the fit and the ease of movement of the legs can be achieved. For example, when this change is taken as one step, as shown in FIG. 15, the third region U3 and the sixth region U6 are divided into two in the front-rear direction LD, and the waist lower elastic members in the compartments U32 and U62 on the leg opening LO side. The contraction force of the widthwise WD per piece of 16,19 is weaker than the contraction force of the widthwise WD per piece of the waist lower

elastic members

16, 19 in the sections U31 and U61 on the waist opening WO side. (For example, it may be about 4/5 to 3/5 times). As shown in FIG. 16, it is also preferable that the third region U3 does not change the tightening force, but only the sixth region U6.

The symmetry of the stretch characteristics in the front waist circumference and the rear waist circumference can be appropriately determined. For example, as shown in FIG. 15, the position of the edge of the first region U1 on the waist opening WO side and the position of the edge of the fourth region U4 on the waist opening WO side are matched in the vertical direction orthogonal to the width direction WD. At the same time, when the position of the edge of the first region U1 on the leg opening LO side and the position of the edge of the fourth region U4 on the leg opening LO side are aligned in the vertical direction orthogonal to the width direction WD, the tightening is strengthened. Since the front waist circumference portion and the rear waist circumference portion have symmetrical expansion and contraction characteristics, the interior body 200 is suitable for front-back symmetrical products including the structure and arrangement.

On the other hand, for products that emphasize fit to the body surface, such as products that are large to some extent, it is often desirable to have a more asymmetrical structure, including the structure and arrangement of the interior body 200. In such a product, as shown in FIG. 16, the edge of the first region U1 on the waist opening WO side is positioned closer to the leg opening LO side than the edge of the fourth region U4 on the waist opening WO side, and the first If the edge of the region U1 on the leg opening LO side is located closer to the leg opening LO side than the edge of the fourth region U4 on the leg opening LO side, a more preferable fit can be obtained.

The contraction force during extension of the width direction WD per one waist lower elastic member 19 in the first region U1 is 0.9 of the extension contraction force of the width direction WD per waist lower elastic member 16 in the fourth region U4. It is preferably about 1.1 times, and more preferably equal. Further, the contraction force during extension of the width direction WD per 19 waist lower elastic members 19 in the second region U2 is 0 of the extension contraction force of the width direction WD per waist lower elastic member 16 in the fifth region U5. It is preferably 9.9 to 1.1 times, and more preferably equal. Further, the contraction force during extension of the width direction WD per one waist lower elastic member 19 in the third region U3 is 0 of the extension contraction force of the width direction WD per waist lower elastic member 16 in the sixth region U6. It is preferably 9.9 to 1.1 times, and more preferably equal. As a result, the tightening forces of the waist lower

elastic members

16 and 19 become substantially equal on the front side and the rear side of the waist circumference portion, and the waist circumference portion is evenly tightened in the waist circumference direction.

As an example, when the materials and elongation rates of the lower waist

elastic members

16 and 19 are all the same and the elongation rate is 260 to 300%, the thicknesses of the lower waist

elastic members

16 and 19 in each region are as follows. can do.
First region U1: 620-940 dtex
2nd region U2: 4/5 to 1/2 times the first region U1 Leg opening side compartment U32 in the third region U3: 4/5 to 1/2 times the first region U1 Waist opening in the third region U3 Side compartment U31: 4/5 to 3/5 times the compartment U32 Fourth region U4: 620 to 940 dtex
5th region U5: 4/5 to 1/2 times the 4th region U4 Leg opening side compartment U62 in the 6th region U6: 4/5 to 1/2 times the 4th region U4 Waist opening in the 6th region U6 Side compartment U61: 4/5 to 3/5 times that of compartment U62

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

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

・ "Front side" means the one closer to the wearer's skin when worn, and "back side" means the one farther from the wearer's skin when worn.

・ "Front surface" means the surface closer to the wearer's skin when worn, and "back surface" means the surface farther from the wearer's skin when worn.

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

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

・ "Metsuke" is measured as follows. After the sample or test piece is pre-dried, it is left in a test room or device in a standard state (the test place is a temperature of 23 ± 1 ° C. and a relative humidity of 50 ± 2%) to bring it into a constant weight state. Pre-drying refers to constant weight of a sample or test piece in an environment with a temperature of 100 ° C. For fibers with an official moisture content of 0.0%, pre-drying does not have to be performed. From the test piece in a constant weight state, a sample having a size of 100 mm × 100 mm is cut out using a sample collecting template (100 mm × 100 mm). The weight of the sample is measured and multiplied by 100 to calculate the weight per square meter, which is used as a basis weight.

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

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

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

・ "Expanded state" means a state in which it is deployed flat without contraction (including all contractions such as contraction due to elastic members) and slack.

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

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

The present invention can be used for all pants-type disposable wear items such as shorts-type sanitary napkins, as well as pants-type disposable diapers as in the above example.

11 ... Liquid impermeable sheet, 12A ... Side seal, 12B ... Rear exterior body, 12C ... Cylindrical part, 12E ... Waist extension part, 12F, 12B ... Exterior body, 12F ... Front exterior body, 12S, 12H ... Sheet Material, 13 ... Cover non-woven fabric, 16, 19 ... Waist lower elastic member, 17 ... Waist elastic member, 18 ... Unnecessary elastic member, 20 ... Inner / outer joint, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbent element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Rising gather, 60A ... Tip side part, 60B ... Base side part, 62 ... Gather sheet, 63 ... Gather elastic member, 67 ... Folding part, 68 ... Rising Part, 70 ... side flap, 71 ... first sheet layer, 72 ... second sheet layer, 73 ... side elastic member, 74 ... innermost sheet layer, 75 ... outermost sheet layer, 76 ... inner sheet layer, 77 ... non-joint part, A1 ... non-stretchable area, A2 ... stretchable area, B ... back body, C ... buttocks cover part, F ... front body, HM ... hot melt adhesive, L ... intermediate area, LD ... front-back direction, LO ... leg opening, P1 ... first part, P2 ... second part, SG ... side elastic area, T ... waist area, U ... lower waist, W ... waist, WD ... width direction, WO ... waist opening, U1 ... 1st region, U2 ... 2nd region, U3 ... 3rd region, U4 ... 4th region, U5 ... 5th region, U6 ... 6th region, 69 ... Boundary.

Claims

Waist opening and pair of left and right leg openings,
An exterior body having a front waist circumference and a rear waist circumference,
It is provided with an interior body attached to the exterior body so as to extend in the front-rear direction over the front waist circumference portion and the rear waist circumference portion.
Rising gathers are provided on both sides of the interior body so as to be in contact with the wearer's body surface.
The rising gathers are a rising portion extending from the front waist circumference portion through the crotch portion to the rear waist circumference portion, a lodging portion that is continuous on both front and rear sides of the rising portion and is fixed in an inverted state, and the rising portion. It has an elongated gather elastic member provided along the front-rear direction at least at the tip of the portion.
The raised portion can be expanded and contracted in the front-rear direction together with the gather elastic member.
The front waist circumference portion and the rear waist circumference portion have a waist portion located at the edge portion of the waist opening and a waist lower portion located on the leg opening side from the waist portion.
The lower waist portion in the front waist circumference portion and the rear waist circumference portion has at least the waist lower expansion and contraction regions provided on both sides in the width direction.
The waist lower elastic region in the anterior waist circumference portion and the posterior waist circumference portion incorporates an elongated lower waist lower elastic member along the width direction, and can be expanded and contracted in the width direction together with the waist lower elastic member. can be,
The waist lower expansion / contraction region in the front waist circumference portion is 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 the legs more than the first region. It consists of a third area located on the opening side.
The first region, the second region, and the third region are regions in which a plurality of elastic members below the waist are arranged at intervals in the front-rear direction.
The first region is a region in which the contraction force during extension in the width direction per elastic member below the waist is 1.1 to 2.0 times that of the second region and the third region.
The waist lower expansion / contraction region in the rear waist circumference portion is more than the fourth region located in the middle in the front-rear direction, the fifth region located on the waist opening side of the fourth region, and the fourth region. It consists of a sixth area located on the leg opening side.
The fourth region, the fifth region, and the sixth region are regions in which a plurality of elastic members below the waist are arranged at intervals in the front-rear direction.
The fourth region is a region in which the contraction force during extension in the width direction per elastic member below the waist is 1.1 to 2.0 times that of the fifth region and the sixth region.
The first region and the fourth region have a tubular portion connected to the waist circumference direction.
The tubular portion overlaps the boundary between the inverted portion and the raised portion on at least one of the front waist circumference portion and the rear waist circumference portion, and the waist opening side and the leg from the boundary. Each of the opening sides has at least one lower waist elastic member.
Pants-type disposable wear items that are characterized by that.
The waist lower elastic member in the first region and the waist lower elastic member in the fourth region extend toward the center in the width direction to a position where they overlap with the rising gathers, and
In the region where the interior body and the exterior body overlap, the portion where the waist lower elastic member in the first region, the waist lower elastic member in the fourth region, and the rising gather overlap with the interior body. It is joined to the exterior body,
The pants-type disposable wear item according to claim 1.
In the third region and the sixth region, the contraction force at the time of extension in the width direction per waist lower elastic member is weakened by one step or more every one or more toward the leg opening.
The pants-type disposable wearable article according to claim 1 or 2.
The position of the edge on the waist opening side of the first region and the position of the edge on the waist opening side of the fourth region coincide with each other in the vertical direction orthogonal to the width direction.
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 with each other in the vertical direction orthogonal to the width direction.
The pants-type disposable wear item according to any one of claims 1 to 3.
The waist opening side edge of the first region is located closer to the leg opening side than the waist opening side edge of the fourth region.
The edge of the first region on the leg opening side is located closer to the leg opening side than the edge of the fourth region on the leg opening side.
The pants-type disposable wear item according to any one of claims 1 to 3.
The contraction force during extension in the width direction per one elastic member below the waist in the first region is 0.9 to 1 of the contraction force during extension in the width direction per elastic member below the waist in the fourth region. .1 times,
The contraction force during extension in the width direction per one elastic member below the waist in the second region is 0.9 to 1 of the contraction force during extension in the width direction per elastic member below the waist in the fifth region. .1 times,
The contraction force during extension in the width direction per one elastic member below the waist in the third region is 0 of the contraction force during extension in the width direction per at least one elastic member below the waist in the sixth region. It is 9.9 to 1.1 times,
The pants-type disposable wear article according to claim 4 or 5.
All the waist lower elastic members have the same material and elongation rate.
The thickness of the waist lower elastic member in the first region and the fourth region is 1 of the thickness of the waist lower elastic member in the second region and the third region, and the fifth region and the sixth region. .1 to 2.3 times,
The pants-type disposable wear item according to any one of claims 1 to 6.
The exterior body has a front exterior body that constitutes at least the waist circumference portion of the front body and a rear exterior body that constitutes at least the waist circumference portion of the rear body.
Both sides of the front exterior body and both sides of the rear exterior body are joined to form a side seal.
The front exterior body and the rear exterior body are separated in the front-rear direction without being continuous on the crotch side.
The pants-type disposable wear item according to any one of claims 1 to 7.