JP2020195421A - Disposable wearing article - Google Patents

Abstract

To improve texture of a side part of a crotch part.SOLUTION: In a disposable wearing article which has side flaps 70 having no absorber 56 on both side parts of a crotch part, the side flaps 70 having a side stretchable area SG where one or more slender side elastic members 73 are provided along a back and forth direction LD and at intervals from each other, the side flaps 70 have hollow parts 80 continuing the back and forth direction LD along the side edge. A part including the hollow parts 80 in the side flaps 70 contracts in the back and forth direction LD to form side gathers by contraction of the side elastic members 73.SELECTED DRAWING: Figure 14

Description

The present invention relates to a disposable wear article having improved touch (flexibility, cushioning property) on the side of the crotch portion.

One of the typical examples of disposable items is a pants-type disposable diaper. Pants-type disposable diapers include an exterior body that constitutes at least the waistline of the front and back bodies, and an interior body that includes an absorber that is attached to the exterior body 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 sides of the front body exterior body and both sides of the rear body exterior body to form a side seal portion. (See, for example, Patent Document 1).

In some conventional pants-type disposable diapers, the side part of the crotch part is formed only by the exterior body, but recently, the side part of the crotch part is often formed by the side part of the interior body. (See, for example, Patent Document 1).

So-called tape-type disposable diapers (see Patent Documents 2 to 4) are also one of the representative examples of disposable wearable articles. A general tape-type disposable diaper has a crotch portion including the center in the anterior-posterior direction, a ventral portion extending anteriorly from the center in the anterior-posterior direction, and a dorsal portion extending posteriorly from the center in the anterior-posterior direction. The side part has a main body part located between the left and right wing parts, at least the dorsal part has a wing part extending to both left and right sides in the width direction from the crotch part, and the wing part is the outer surface of the ventral part. It has a connecting part that is detachably connected to. At the time of use, the wing portion is turned from both sides of the waist to the outer surface of the ventral portion, and the connecting portion of the wing portion is connected to the outer surface of the ventral portion.

Conventionally, as a tape-type disposable diaper, a side flap extending laterally from the side edge of the absorber is excised along the circumference of the leg, and an unexcised portion is left as a wing portion (for example, Patent Document). In addition to (see 2), a separate type (see, for example, Patent Documents 3 and 4) in which a separately manufactured connecting tape is attached to the side edge of the assembly forming the main body portion and the connecting tape serves as a wing portion is known. There is. Further, as a separate type, a type in which a unit including the left and right wing portions is attached to an assembly forming the main body portion is also proposed (see, for example, Patent Document 6).

In such a tape-type disposable diaper, the side portion of the crotch portion is formed by the side portion of the side flap.

By the way, in these disposable wearable articles, in order to ensure the fit to the legs, an elongated elastic member is built in between the seat layers on the side of the crotch portion in the direction along the leg circumference or in the front-rear direction. It is known.

However, with conventional disposable items, the softness and cushioning of the side of the crotch, especially the flexibility and cushioning (compression) of the seat layer when the product is held by hand or during wearing when wearing or purchasing. There was room for improvement in stability).

Japanese Unexamined Patent Publication No. 2006-12239 Japanese Unexamined Patent Publication No. 2016-083077 Japanese Unexamined Patent Publication No. 2010-22550 Japanese Unexamined Patent Publication No. 2011-72736

Therefore, a main object of the present invention is to improve the feel of the side portion of the crotch portion.

The disposable wearable articles that have solved the above problems are as follows.
<First aspect>
On both sides of the crotch, there are side flaps that do not have an absorber,
The side flap has a side telescopic region in which one or more elongated side elastic members are provided along the front-rear direction and at intervals from each other.
In disposable wear items
The side flap has a hollow portion extending in the front-rear direction along its side edge.
Due to the contraction of the side elastic member, the portion of the side flap including the hollow portion contracts in the front-rear direction to form side gathers.
Disposable wear goods characterized by that.

(Action effect)
In this disposable wearable article, due to the contraction of the side elastic member, the portion including the hollow portion along the side flap contracts in the front-rear direction, and the folds of the side gathers are formed side by side in the front-rear direction. Here, when side gathers are formed in the portion of the side flap including the hollow portion, the folds of the side gathers are formed by the hollow portion greatly bulging, and become large and soft (that is, rich in cushioning property). Therefore, the large and soft folds make the sides of the crotch feel good (fluffy and fluffy).
<Second aspect>
The hollow portion extends from the side edge of the side flap to a position separated from the side edge in the width direction by 2 mm or more.
Disposable wear article of the first aspect.

(Action effect)
The position and width of the hollow portion may be appropriately determined, but usually, it is preferably within the range of this embodiment.

<Third aspect>
The portion of the side flap from the side edge to the center side in the width direction of 2 to 15 mm does not include the side elastic member and includes a part or all of the hollow portion.
Disposable wear article of the first or second aspect.

(Action effect)
In this way, if the side elastic member is sufficiently separated from the side edge of the side flap and the separated portion includes a part or all of the hollow portion, the product is being attached or purchased when the product is held by hand or during attachment. In addition, large folds rich in flexibility and cushion are formed on the entire side of the part pressed against the skin (that is, the part having the side elastic member) in the thickness direction, which improves the feel of the end of the leg opening. Is particularly preferable.

<Fourth aspect>
At least one side elastic member is provided on the front side of the hollow portion.
A disposable wearable article according to any one of the first to third aspects.

(Action effect)
The positional relationship between the hollow portion and the side elastic member can be appropriately determined, but if at least one side elastic member is provided on the front side of the hollow portion, the contraction force of the side elastic member is directly applied to the hollow portion. , It is preferable because the shape of the folds can be maintained in the hollow portion.

<Fifth aspect>
A plurality of the hollow portions are provided so as to overlap each other in the thickness direction.
A disposable wearable article according to any one of the first to fourth aspects.

(Action effect)
In this structure, folds are independently formed in the portion located between the plurality of hollow portions, and the folds are overlapped with each other, so that folds having better cushioning property are formed on the side portion of the side flap. ..

<Sixth aspect>
The side flap has a folded sheet layer that is folded back at the side edge of the side flap from the front side of the hollow portion to the back side of the hollow portion.
The hollow portion extends laterally to the folded position of the folded sheet layer.
A disposable wearable article according to any one of the first to fifth aspects.

(Action effect)
As described above, it is preferable that the hollow portion is formed by the folded sheet layer because the cushioning property of the folds formed in the hollow portion is particularly improved by the restoring force against the folded back.

<7th aspect>
The side flaps have a double folded sheet layer folded back at the side edges of the side flaps.
The outermost sheet layer and the innermost sheet layer in the side flap are a front side portion and a back side portion with the folded position of the folded sheet layer located on the outside as a boundary, respectively.
The width of the side elastic member is wider than the folding position between the front side portion with the folding position of the folded sheet layer located outside as a boundary and the front side portion with the folding position of the folded sheet layer located inside as a boundary. It is fixed at a position away from the center of the direction,
Between the side elastic member located most laterally and the side edge of the side flap, a hollow portion is formed between the sheet layers because all the sheet layers adjacent to each other in the thickness direction are not joined. ing,
A disposable wearable article according to any one of the first to fifth aspects.

(Action effect)
In this structure, by arranging the double folded sheet layer on the side flap, three hollow portions (three chambers in the thickness direction) can be formed on at least the side portion of the side flap. In this case, since each of the double folded sheet layers has a restoring force against the folded, folds having better cushioning property are formed on the side portion of the side flap with less sheet material.

<8th aspect>
The rising gathers that rise from the position on the center side in the width direction of the side elastic member extend along the front-rear direction.
The rising gather includes a gather sheet that is folded in half at the tip portion to form a two-layer structure, and an elongated gather elastic member provided along the front-rear direction between layers of the two-layer structure at least at the tip portion. Have and
Both sides of the side flaps are a first portion in which a two-layer structure made of the gathered sheet extends from the starting point to a side edge of the side flap, and a two-layer structure made of the gathered sheet is folded back at the side edge of the side flap. It has a second part that extends toward the center in the width direction.
The double folded sheet layer is the first portion and the second portion of the gather sheet.
Disposable wear article of the seventh aspect.

(Action effect)
For disposable wearable articles, it is common to provide rising gathers as in this embodiment. That is, a general rising gather has a gather sheet that is folded in half at the tip and has a two-layer structure. Therefore, it is preferable to provide the above-mentioned hollow portion by extending the two-layer structure of the gather sheet and folding it back at the side edge. This allows folds with better cushioning to be formed on the sides of the side flaps with less sheet material.

<Ninth aspect>
A plurality of the side elastic members are provided at intervals in the width direction.
The elongation rate of the side elastic member in the side expansion / contraction region in the unfolded state is lower as it is located laterally.
A disposable wearable article according to any one of the first to eighth aspects.

(Action effect)
By providing a plurality of side elastic members by changing the elongation rate in this way, the rise of the side elastic region to the skin side becomes loose, and the side elastic region tends to be in an appropriate mounting state. If the side telescopic area rises too tightly, the side flaps may fold inward and get caught between the legs and the surface of the disposable item, leading to leakage.

<10th aspect>
An exterior body that constitutes at least the waistline of the front and back bodies, an interior body with a built-in absorber attached to the exterior body from the front body to the back body, a waist opening, and a pair of left and right A pants-type disposable wear item with a leg opening.
The side flaps are provided on both sides of the interior body.
A disposable wearable article according to any one of the first to ninth aspects.

(Action effect)
When applied to pants-type disposable wear articles, it is desirable to provide side flaps having no absorber on both sides of the interior body in this way, and to provide hollow portions in the side flaps.

According to the present invention, there are advantages such as improved touch of the side portion of the crotch portion.

It is a top view which shows the inner surface of the pants type disposable diaper in the unfolded state. It is a top view which shows the outer surface of the pants type disposable diaper in the unfolded state. It is a 2-2 sectional view of FIG. It is 3-3 sectional view of FIG. (A) is a 4-4 sectional view of FIG. 1, and (b) is a 5-5 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 sectional drawing of another example corresponding to the 2-2 cross section of FIG. It is sectional drawing of another example corresponding to the 3-3 cross section of FIG. It is an enlarged sectional view of the main part in the lower part of the waist of a rear exterior body. It is an enlarged sectional view of the main part in the lower part of the waist of a rear exterior body. It is an enlarged plan view of the front exterior body. It is an enlarged plan view of the rear exterior body. It is an enlarged plan view of the front exterior body. It is an enlarged plan view of the rear exterior body. It is an enlarged plan view of the front exterior body. It is an enlarged plan view of the rear exterior body. It is a perspective view of the cutting device. It is an enlarged plan view of the non-stretchable region portion.

Hereinafter, as an example of the pants-type disposable diaper, the pants-type disposable diaper will be described in detail with reference to the attached drawings. The dotted pattern portion in the cross-sectional view shows an adhesive as a joining means for joining the constituent members located on the front side and the back side thereof, and is a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating. The fixed part of the elastic member is formed by (transfer of hot melt adhesive by the letterpress method) or by coating the elastic member on the outer peripheral surface of the elastic member such as comb gun or sure wrap coating instead of or together with this. is there. Examples of the hot melt adhesive include EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type and the like, but they can be used without particular limitation. As a joining means for joining each component, a means by material welding such as a heat seal or an ultrasonic seal can also be used.

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 at least the waist circumference of the front body F, a rectangular rear exterior body 12B that constitutes at least the waist circumference of the back body B, and a crotch from the front exterior body 12F. It is provided with an interior body 200 provided inside the exterior bodies 12F and 12B so as to extend through the portion to the rear exterior body 12B. Both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form a side seal portion 12A, whereby an 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 of the interior body is passed, 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 in the width direction of the interior body 200 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 back 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 portion 12A, and a front-back direction of a portion forming the leg opening LO. It has an intermediate region L defined as a range (between the front-rear direction region having the side seal portion 12A of the front body F and the front-rear direction region having the side seal portion 12A of the back body B). The waist circumference region T can be divided into a "waist portion" W that conceptually forms an edge portion of the waist opening and a "waist lower portion" U that is a portion below this. Normally, when there is a boundary in the waist circumference region T where the tensile stress in the width direction changes (for example, the thickness and elongation rate of the elastic member change), the waist opening WO side is the waist rather than the boundary on the waist opening WO side. If there is no such boundary, the waist 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 can be 15 to 40 mm and the waist lower portion U can be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are constricted in a U-shape or a curved shape along the circumference of the wearer's legs, and this is a portion for inserting the wearer's legs. As a result, the pants-type disposable diaper in the unfolded state has an 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 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, and reference numeral 60 indicates an interior body. In order to prevent excrement from leaking to both sides of the 200, the rising gathers 60 extending from both sides of the interior body 200 so as to be in contact with the wearer's legs are shown.

(Top sheet)
The top sheet 30 has a property of allowing liquid to permeate, and examples thereof include a perforated or non-perforated non-woven fabric and a porous plastic sheet. 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 on 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 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 portion of the packaging sheet 58 located on the front side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(Intermediate sheet)
In order to quickly transfer the liquid that has permeated the top sheet 30 to the absorber, an intermediate sheet (also referred to as a "second sheet") 40 having a faster liquid permeation speed than the top sheet 30 can be provided. The intermediate sheet 40 is for quickly transferring the liquid to the absorber 56 to enhance the absorption performance by the absorber 56 and to prevent the absorbed liquid from returning from the absorber 56. The intermediate sheet 40 may be omitted.

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

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

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

(Liquid impermeable sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited, but for example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated non-woven fabric having a plastic film on the surface of the non-woven fabric, or a plastic film. An example can be exemplified of a laminated sheet in which a non-woven fabric or the like is laminated and joined. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impermeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition to this, non-woven fabrics using microdenyl fibers, leakage-proof strengthening by reducing the voids of the fibers by applying heat or pressure, coating of highly water-absorbent resin or hydrophobic resin or water-repellent agent, etc. 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, both sides of the absorbing element 50 are wrapped around the side surface of the top sheet 30 of the absorbing element 50. It can also be extended to both sides. The width of the extending portion is appropriately about 5 to 20 mm on each side.

(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 necessary. Can also be used. The basis weight of fibers, when fiber stacking flocculent pulp or short fibers, for example, be a 100 to 300 g / m ² approximately, in the case of a filament aggregate, for example, be 30 to 120 g / m ² approximately Can be done. In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The degree of crimping of the crimped fibers can be, for example, 5 to 75 fibers per 2.54 cm, preferably 10 to 50 fibers, and more preferably about 15 to 50 fibers. In addition, uniformly crimped crimped fibers can be used. It is preferable to disperse and hold the highly absorbent polymer particles in the absorber 56.

The absorber 56 may have a rectangular shape, but as shown in FIG. 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.

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

(Highly absorbent polymer particles)
The absorber 56 may contain highly absorbent polymer particles in part or in whole. The highly absorbent polymer particles include "powder" in addition to "particles". As the highly absorbent polymer particles 54, those used for this kind of disposable diaper can be used as they are, for example, a sieve (shaking for 5 minutes) using a standard sieve (JIS Z8801-1: 2006) of 500 μm. It is desirable that the proportion of particles remaining on the sieve is 30% by weight or less, and the proportion of particles remaining on the sieve is determined by sieving (shaking for 5 minutes) using a standard sieve (JIS Z8801-1: 2006) of 180 μm. 60% by weight or more is desirable.

The material of the highly absorbent polymer particles can be used without particular limitation, but those having a water absorption of 40 g / g or more are preferable. Highly absorbable polymer particles include starch-based, cellulosic-based and synthetic polymer-based ones, which are starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and crosslinked sodium carboxymethyl celluloses. A substance or an acrylic acid (salt) polymer or the like can be used. As the shape of the highly absorbent polymer particles, a 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, the 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 amount of absorption required for the application of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the 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 polypropylene, polyethylene / polypropylene composite material, or the like can be used as the material. 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 projected from the front and rear of the absorber 56, and the overlapping portion and the overlapping 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 rising gather 60 of the illustrated example, the base side portion 60B stands up diagonally toward the center side in the width direction, and the tip side portion 60A stands up diagonally toward the outside in the width direction from the middle portion. It is not limited, and it is possible to make appropriate changes such as those standing on the center side in the width direction as a whole.

More specifically, in the raised gather 60 of the illustrated example, a 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 between the folded-back portion and the sheets in the vicinity thereof in an elongated state along the longitudinal direction at intervals in the width direction WD. The base end portion (the end portion opposite to the seat folded portion in the width direction WD) located on the side opposite to the tip portion of the rising gather 60 is a root portion 65 fixed to the side portion of the interior body 200. The portion other than the root portion 65 is a main body portion 66 (a 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 front-rear direction intermediate portion of the main body portion 66 is fixed to the side surface of the top sheet 30 in the front-rear direction, while the front-rear direction intermediate portion 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 rising 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.

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 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 the inverted state, and the root side portion 60B is joined to the top sheet 30 in the inverted state. At least one of hot melt adhesives by various coating methods and material welding means such as heat sealing and ultrasonic sealing can be used for joining the facing surfaces in the inverted portion 67. In this case, the joining of the root side portion 60B and the top sheet 30 and the joining of the tip side portion 60A and the root side portion 60B may be performed by the same means or by different means. For example, it is 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.

As the gather sheet 62, a flexible, uniform and concealing non-woven fabric such as a spunbonded non-woven fabric (SS, SSS, etc.), an SMS non-woven fabric (SMS, SMSMS, etc.), a melt-blown non-woven fabric, etc., is water-repellent with silicone or the like, if necessary. Those that have been treated 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 . As the gather elastic member 63, thread rubber or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate of the gathered 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. The arrangement interval 60d of the gather elastic member 63 is appropriately 3 to 10 mm. With this configuration, the gathered elastic member 63 can easily hit the skin in the area where it is arranged. The gather elastic member 63 may be arranged not only on the tip side but also on the base side.

In the rising portion 68 of the rising gather 60, a hot melt adhesive, a heat seal, 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 by various coating methods. At least one of the fixing means by welding the material such as a seal can be used. If the entire inner and outer layers of the gather sheet 62 are bonded together, the flexibility is impaired. Therefore, it is preferable that the parts other than the adhesive portion of the gather elastic member 63 are not adhered or are weakly adhered. 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 lodging portion 67, at least one of a hot melt adhesive by various coating methods and a means by material welding such as heat sealing and ultrasonic sealing can be used.

(Side flap)
Side flaps 70 extending to the side of the absorber 56 are provided on both sides of the interior body 200, and each side flap 70 has a hollow portion 80 that continues to the LD in the front-rear direction along the side edge thereof. It is preferable to do so. Further, each side flap 70 has a side expansion / contraction region SG in which one or a plurality of elongated side elastic members 73 are provided along the front-rear direction LD and at intervals from each other. As a result, due to the contraction of the side elastic member 73, the portion of the side flap 70 including the hollow portion 80 contracts in the front-rear direction LD, and side gathers in which a large number of folds are lined up in the front-rear direction LD are formed. Here, when side gathers are formed in the portion of the side flap 70 including the hollow portion 80, as shown in FIG. 6, the folds of the side gathers are formed by the hollow portion 80 being greatly expanded, and are large and soft (that is, cushion). It will be (rich in sex). Therefore, the large and soft folds make the sides of the crotch feel good (fluffy and fluffy).

The side flap 70 has a first sheet layer 71 facing the outside of the side elastic member 73 and a second sheet layer 72 facing the inside of the side elastic member 73 in order to fix the side elastic member 73. preferable.

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 rising 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. As shown in FIGS. 9, 10 and 12, a special sheet material 79 different from the rising gather 60 may be added to construct the side flap 70. In the former case, the front and rear ends of the side flap 70 coincide with the front and rear ends of the raised gather 60 (that is, the front and rear ends of the interior body 200 in this case), but in the latter case, the front and rear ends of the side flap 70 are raised and front and rear of the raised gather 60. It may be located on the center side in the front-rear direction from the end.

The side elastic member 73 is also 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 side expansion / contraction region SG in the unfolded 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. The arrangement interval of the side elastic members 73 is preferably 5 to 10 mm. In particular, when a plurality of side elastic members 73 are provided at intervals in the width direction WD, the extension rate of the side elastic members 73 in the side expansion / contraction region SG in the deployed state is lower as it is located on the side. This is preferable because the elastic region SG rises slowly toward the skin and the side elastic region SG tends to be in an appropriate wearing state. If the side expansion / contraction region SG rises too tightly, the side flap 70 may fold inward and be sandwiched between the leg and the surface of the disposable article, leading to leakage.

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 bonding 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 parts other than the adhesive portion of the side elastic member 73 are not bonded or are weakly bonded. 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 LD, that is, the range of the front-rear direction LD of the side expansion / contraction region SG is from the portion overlapping the front exterior body 12F to the portion overlapping the rear exterior body 12B. The range of the front-rear direction LD of the side expansion / contraction region SG is preferably the same as or wider than the range of the front-rear direction LD of the non-joining portion 77 described later. Further, it is preferable that the range of the front-rear direction LD of the side expansion / contraction region SG is the same as the contracted portion of the rising gather 60 by the gather elastic member 63, or extends to both front-rear and front-rear sides.

The side flap 70 preferably has three or more sheet layers including the first sheet layer 71 and the second sheet layer 72. That is, in addition to the outermost sheet layer 74 and the innermost sheet layer 75, it is preferable to have 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 liquid impermeable sheet 11 can be formed by appropriately extending or folding back.

The structure of the hollow portion 80 is not particularly limited, but can be formed by, for example, the following laminated structure of sheet layers. That is, in the side flap 70 of the illustrated example, a non-joint portion 77 in which at least one of the outermost sheet layer 74 and the innermost sheet layer 75 and the inner sheet layer 76 overlapping the inner sheet layer 76 is not bonded is formed. .. The non-joint portion 77 is a portion that continuously or intermittently continues to the anteroposterior 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 there. That is, as long as one of the outermost sheet layer 74 and the innermost sheet layer 75 and the inner sheet layer 76 overlapping the back surface of the non-bonded portion 77 are non-bonded, the non-bonded 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 frontmost sheet layer 74 and the inner sheet layer 76 overlapping the back side are not joined is the most lateral portion from the side edge. The portion up to the fixed position of the side elastic member 73, in which the innermost sheet layer 75 and the inner sheet layer 76 overlapping the back side are not joined, continues to the central side in the width direction. In the non-joined portion 77 of the example shown in FIGS. 9, 10 and 12, the most front side sheet layer 74 and the inner sheet layer 76 overlapping the back side thereof are non-joined portions, and the innermost back side sheet layer 75 and the back side thereof. The portion that is not joined to the inner sheet layer 76 that overlaps with the inner sheet layer 76 continues from the side edge to the center side in the width direction from the fixed position of the side elastic member 73 that is the most lateral, but the former is the center in the width direction. It continues to the side.

The size of the WD in the width direction of the non-joint portion 77 can be appropriately determined, but is preferably 2 to 15 mm, particularly preferably 5 to 10 mm. That is, the dimension of the WD in the width direction of the hollow portion 80 is preferably 2 mm or more. As shown in the illustrated example, when the rising gather 60 is provided, the central edge of the non-joining portion 77 in the width direction WD is located laterally from the boundary between the root portion 65 and the main body portion 66 (starting point of rising). Is preferable. Further, the dimension of the front-rear LD of the non-joint portion 77 (the dimension of the hollow portion 80 in the front-rear direction) 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 is LD in the front-rear direction to a position where it overlaps with the front exterior body 12F and the rear exterior body 12B, respectively. It is preferable that it extends to. In this case, it is preferable that the non-joining portion 77 extends over the entire front-rear LD of the interior body 200. Further, the non-joining portion 77 extends only to a 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 of 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.

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

As shown in the illustrated example, a non-joint portion 77 closed on both sides of the WD in the width direction is formed, and this non-joint portion 77 is between the side elastic member 73 located most laterally and the side edge of the intermediate region L. When the width direction WD range including the region (the width direction WD range equal to or larger than the region) continues to the anteroposterior LD, the side edge of the side flap is surrounded by a hollow portion 80 by a sheet layer. Will follow the LD in the anteroposterior direction. In this case, the folds formed on the side portion of the side flap are formed by a large bulge of at least one of the outermost sheet layer 74 and the innermost sheet layer 75, and are large and soft (that is, rich in cushioning). It becomes. Therefore, since the large and soft folds are formed on the inside, outside, both inside and outside, or the entire thickness direction of the range including the side edge of the side flap 70, 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 in the width direction WD of 2 to 15 mm (particularly 5 to 10 mm) is , It is preferable not to include the side elastic member 73. Further, the portion from the side edge to the center side in the width direction WD from 2 to 15 mm (particularly 5 to 10 mm) preferably includes a part or all of the hollow portion 80. When the side elastic member 73 is sufficiently separated from the side edge of the side flap 70 in this way, a portion that is pressed against the skin when the product is held by hand or during wearing (that is, the side elastic member 73) Since large folds rich in flexibility and cushion are formed on the entire side in the thickness direction of the portion having the leg opening LO, it is particularly preferable to improve the touch of the end portion of the leg opening LO. This effect is particularly remarkable 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 hollow portion 80.

The positional relationship between the hollow portion 80 and the side elastic member 73 can be appropriately determined, but as shown in the illustrated example, if at least one side elastic member 73 is provided on the front side of the hollow portion 80, the side It is preferable because the contraction force of the elastic member 73 is directly applied to the hollow portion 80, and the shape retention of the folds in the hollow portion 80 is high.

In the non-bonded portion 77, even if the inner sheet layer 76 overlapping the back of the outermost sheet layer 74 or the innermost sheet layer 75 is fixed to the adjacent sheet layer on the opposite side as shown in FIG. Good (the first sheet layer 71 and the second sheet layer 72 of the illustrated example are bonded to each other with a hot melt adhesive HM), but as shown in FIG. 11, the inner sheet layer 76 is a sheet adjacent to both sides in the thickness direction. It is particularly preferable that it is non-fixed to the layer. That is, it is preferable that a plurality of hollow portions 80 partitioned by the inner sheet layer 76 are provided so as to overlap each other in the thickness direction. As a result, folds are independently formed in the portion located between the plurality of hollow portions 80, and the folds are overlapped with each other so that folds having better cushioning property are formed on the side portion of the side flap 70. Become.

As shown in the illustrated example, the side flap 70 has a folded sheet layer extending from a portion located on the front side of the hollow portion 80 to a portion located on the back side of the hollow portion 80 by being folded back at the side edge of the side flap 70. It is preferable that the hollow portion 80 extends laterally to the folded position of the folded sheet layer because the cushioning property of the folds formed in the hollow portion 80 is particularly improved by the restoring force against the folding. The folded sheet layer means a pair of layers formed by folding the sheet material.

One preferred example is the structure shown in FIGS. 3, 4 and 11. The side flap 70 portion 70 has a double folded sheet layer folded back at its side edge, and the outermost sheet layer 74 and the outermost sheet layer 75 of the non-joint portion 77 are external to each other. It is a front side part and a back side part with the folded position of the folded back sheet layer as a boundary. Further, the side elastic member 73 is located between the front side portion with the folding position of the folded sheet layer located on the outside as a boundary and the front side portion with the folding position of the folded sheet layer located inside as a boundary. Is also fixed at a position distant from the center side of the width direction WD. Then, between the side elastic member 73 located most laterally and the side edge of the side flap 70, all (four layers) of the sheet layers adjacent to each other in the thickness direction are not joined, so that between the sheet layers. Hollow portions 80 are formed in each. In this structure, the hollow portion 80 can be formed in three stages (three chambers in the thickness direction) on at least the side portion of the side flap 70. In this case, since each of the double folded sheet layers has a restoring force against the folded, folds having better cushioning property are formed on the side portion of the side flap 70 with less sheet material.

Another preferred example is the structure shown in FIGS. 9, 10 and 12. The side flap 70 has a double folded sheet layer folded back at its side edge, and the first sheet layer 71 and the second sheet layer 72 sandwiching the side elastic member 73 are each folded back located inside. A portion on one side and a portion on the other side are included with the folding position of the sheet layer as a boundary (that is, both the first sheet layer 71 and the second sheet layer 72 are the inner sheet layer 76). The non-bonded portion 77 includes a portion in which the outermost sheet layer 74 and the first sheet layer 71 overlapping the back surface are not bonded, and the outermost sheet layer 75 and the second sheet layer 72 overlapping the back surface thereof. Is not joined, and the hollow portion 80 extends laterally to the folded position of the folded sheet layer located outside. In this structure, hollow portions 80 are formed on both the front and back sides of the side flap 70 portion, and large folds are formed on both the front and back sides, so that the side flap 70 portion feels good to the touch. .. Further, since the side elastic member 73 is doubly covered with the folded sheet layer, the feel of the side elastic member 73 is less likely to be transmitted to the skin, and the touch is particularly good. Further, since the frontmost sheet layer 74 and the innermost sheet layer 75 are one-sided portion and the other-sided portion with the folded position of the folded-back sheet layer located outside, they are hollow due to the restoring force against the folded-back. The cushioning property of the folds formed in the portion having the portion 80 is also excellent.

Although not shown, the position of the side elastic member 73 in the structures shown in FIGS. 3, 4 and 11 is set between the back side portion and the folded sheet layer located inside with the folded position of the folded sheet layer located outside as a boundary. It may be between the folded position and the back side. That is, the side elastic member 73 may be attached to a portion located on the back side of the hollow portion 80.

When the non-joint portion 77 has a four-layer structure of a sheet layer as in these examples, 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 two-layer structure of the rising gather 60 sheet includes the first portion P1 extending from the base portion 65 of the rising gather 60 to the side edge of the side flap 70, and the rising gather 60 sheet. The two-layer structure can be formed by a second portion P2 that is folded back at the side edge of the side flap 70 and extends toward the center of the WD in the width direction.

(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 is a portion 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 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.

The exterior bodies 12F and 12B have a waist circumference portion that is a range in the front-rear direction corresponding to the waist circumference region T. Further, in this example, the front exterior body 12F and the rear exterior body 12B have the same front-rear dimensions. As shown in FIG. 8, the front-rear direction dimension of the rear exterior body 12B is made longer than the front-rear direction dimension of the front exterior body 12F, and the buttock cover portion extending from the waist circumference region T to the intermediate region L side on the rear exterior body 12B. The front exterior body 12F may be provided with a structure in which a portion corresponding to the intermediate region L is not provided. In this case or conversely, 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.

As shown in FIGS. 4 and 5, the exterior bodies 12F and 12B have an inner sheet layer 12H and an outer sheet layer 12S, and elastic members 16 to 19 provided between them. Each sheet layer may be a common sheet material or may be an individual sheet material. That is, in the former case, in a part or all of the front exterior body 12F and the rear exterior body 12B, the inside of one sheet material folded back at appropriate positions such as the edge of the waist opening WO and the edge on the leg opening LO side. Elastic members 16 to 19 can be provided between the portion and the outer portion. In the illustrated example, each waist portion W has a portion including a folded back of the sheet material. For example, in the waist portion W, the sheet material forming the outer sheet layer 12S extends only to the edge of the waist opening WO, but the sheet material forming the inner sheet layer 12H is a sheet forming the second sheet layer. It wraps around the waist side edge of the material and is folded back inside. Further, this folded portion is an interior cover layer 12r extending over the entire width direction of the exterior body to a position overlapping the end portion of the interior body 200 on the waist opening WO side. The interior cover layer 12r may be attached with a dedicated sheet material without folding back the sheet material forming the inner sheet layer 12H.

Elastic members 16 to 19 are built into the exterior bodies 12F and 12B in order to improve the fit to the waist circumference of the wearer, and elastic regions A2 that elastically expand and contract in the width direction WD with expansion and contraction of the elastic members are formed. ing. In the 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. When the exterior bodies 12F and 12B extend in the longitudinal direction of the elastic member, they completely expand without wrinkles. It can be stretched to a predetermined stretch rate. As the elastic members 16 to 19, in addition to elongated elastic members such as rubber threads (illustrated examples), known elastic members such as strips, nets, and films can be used without particular limitation. As the elastic members 16 to 19, synthetic rubber such as spandex may be used, 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 width direction central portion. 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 thereby extend the WD of the waist portion W in the width direction. The rate is preferably about 150 to 400%, particularly 220 to 320%. Further, the waist portion W does not need to use the waist elastic member 17 having the same thickness for all of the LDs in the front-rear direction or have the same elongation rate. For example, the thickness of the elastic member 17 at the upper part and the lower part of the waist portion W. The pod elongation may be different.

Further, it is preferable that a plurality of lower waist elastic members 15 and 19 made of elongated elastic members are attached to the lower waist portion U of the exterior bodies 12F and 12B at intervals in the front-rear direction. The elastic members 15 and 19 below the waist have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , especially 0.1 to 1). the rubber thread .0mm about ^2), 1 to 15 mm, particularly preferably to dispose 5-30 present at intervals of 3 to 8 mm, this elongation in the width direction WD of the waist lower portion U by 200 to 350% In particular, it is preferably about 240 to 300%.

Further, as shown in FIG. 8, when the buttock cover portion is provided on the rear exterior body 12B as described above, or when the groin cover portion is provided on the front exterior body 12F (not shown), the same elastic member as the lower waist portion is provided. The elongation rate of the WD in the width direction can be 150 to 300%, particularly 180 to 260%.

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 WD in the width direction of the absorber 56 from contracting in a part or all of them. In addition, the middle width direction (preferably including the entire inner and outer joints 201 and 202) including a part or all of the portion overlapping the absorber 56 and the WD in the width direction is defined as the non-stretchable region A1, and both sides in the width direction are stretchable. It is preferable that the area is A2. The waist portion W is preferably a stretchable region A2 over the entire width direction WD, but a non-stretchable region A1 may be provided in the middle in the width direction as in the waist lower portion U. Of the stretchable region A2, the portion located in the front-rear direction LD range having the side seal portion 12A becomes the waist lower stretchable region A3.

Such the stretchable region A2 and the non-stretchable region A1 supply elastic members 15 to 17 and 19 between the inner sheet layer 12H and the outer sheet layer 12S, and the elastic members 16 and 19 are located in the stretchable region A2. After fixing only the portion with the hot melt adhesive, the elastic members 16 and 19 are cut by pressurization and heating at one place in the middle in the width direction in the region having the absorber 56, or the elastic members 16 and 19 are substantially cut. The whole can be finely cut by pressurization and heating, and can be constructed by killing the elasticity in the non-stretchable region A1 while leaving the elasticity in the stretchable region A2.

FIG. 19A shows a case where the elastic members 16 and 19 are cut at one place in the middle in the width direction, and a pressure portion 171 having a cutting convex part 172 at one place in the circumferential direction is formed on the outer peripheral surface. The elastic members 16, 17 are provided between the inner sheet layer 12H and the outer sheet layer 12S by the seal roll 170 in which the cutting convex portion 172 is heated to a desired temperature and the surface-smooth anvil roll 180 arranged to face the seal roll 170. The cutting target to which the parts and 19 are attached is sandwiched so that the inner sheet layer 12H is on the seal roll side, and the elastic members 16 and 19 are pressed only at the portion sandwiched between the cutting convex portion 172 and the outer peripheral surface of the anvil roll 180. And it is heated and cut. In the product subjected to such processing, as shown in FIG. 20A, only the cutting residue continuous from the elastic members 16 and 19 of the elastic region A2 is unnecessary between the outer sheet layer 12S and the inner sheet layer 12H. As the elastic member 18, it remains in a state of being contracted to its natural length by itself.

Further, FIG. 19B shows a case where almost the entire elastic members 16 and 19 are finely cut, and a pressing portion 171 having a large number of cutting convex portions 173 is provided on the outer peripheral surface, and the cutting convex portions 172 are provided. A cutting object in which elastic members 16, 17, 19 are attached between the inner sheet layer 12H and the outer sheet layer 12S by a seal roll 170 heated to a desired temperature and an anvil roll 180 having a smooth surface arranged opposite to the seal roll 170. Is sandwiched so that the inner sheet layer 12H is on the seal roll side, and the elastic members 16 and 19 are pressed and heated to cut only the portion sandwiched between the cutting convex portion 173 and the outer peripheral surface of the anvil roll 180. Is. In the product subjected to such processing, as shown in FIG. 20 (b), between the outer sheet layer 12S and the inner sheet layer 12H, the cutting residue continuous from the elastic members 116 and 19 of the elastic region A2, and both. The cut pieces of the elastic members that are not continuous with the elastic members 16 and 19 of the elastic region A2 of the above are left as the unnecessary elastic members 18 in a state of being contracted to their natural lengths.

The sheet material forming the inner sheet layer 12H and the outer sheet layer 12S 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 by the hot melt adhesive HM by various coating methods. The inner sheet layer 12H and the outer sheet layer 12S are preferably joined by a hot melt adhesive HM for fixing the elastic members 16 to 19 at the portions having the elastic members 16 to 19, respectively, and the elastic members 16 to 19 are joined. In the portion that does not have it, 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. In the portions of the exterior bodies 12F and 12B of the illustrated example having the elastic members 16 to 19, the hot melt adhesive HM is applied only to the outer peripheral surfaces of the elastic members 16 to 19 by a coating means such as a comb gun or a sure wrap nozzle, and the sheet layers are laminated. The elastic members 16 to 19 are fixed to both sheet layers and the layers between the two sheets are fixed only by the hot melt adhesive HM applied to the outer peripheral surfaces of the elastic members 16 to 19 by sandwiching the elastic members 16 to 19. The elastic members 16 to 19 may be fixed to both sheet layers only at both ends in the expansion / contraction direction in the expansion / contraction region A2.

(Inner and outer joints)
The interior body 200 can be fixed to the exterior bodies 12F and 12B by a joining means such as heat sealing or ultrasonic sealing by welding materials, or by a hot melt adhesive. In the illustrated example, the back surface of the interior body 200, that is, in this case, the back surface of the liquid-impermeable sheet 11 and the inner surface of the exterior bodies 12F and 12B via the hot melt adhesive applied to the root portion 65 of the rising gather 60. Is fixed. As shown in FIGS. 13 and 14, the inner / outer joints 201 and 202 for fixing the inner body 200 and the outer bodies 12F and 12B can be provided in almost the entire region where the two overlap, for example, the inner body 200. It can also be provided at a portion excluding both ends in the width direction.

As in the examples shown in FIGS. 17 and 18, when the inner / outer joint portions 201 and 202 are provided over the left and right side expansion / contraction regions SG in the range of the front-rear direction LD having the side expansion / contraction region SG, the side expansion / contraction region It is preferable to fully exhibit the fit. In particular, when the side flap 70 has the above-mentioned non-joining portion 77, the formed portion of the side expansion / contraction region SG can be freely deformed with respect to the portion outside the side flap 70, and the expansion / contraction of the side expansion / contraction region SG can be joined inside and outside. It is preferable because it is not inhibited by parts 201 and 202.

Further, as in the examples shown in FIGS. 17 and 18, the inner / outer joint portions 201 and 202 are the ends of one waist lower stretchable region A3 on the non-stretchable region A1 side in the range in the front-rear direction that does not have the side stretchable region. Therefore, it is preferable that the waist lower stretchable region A3 is provided only in the range up to the end on the non-stretchable region A1 side. As described above, it is preferable to limit the widths of the inner / outer joint portions 201 and 202 to the same degree as the width of the non-stretchable region A1 because unnecessary contraction of the absorber 56 can be suppressed.

Therefore, as in the examples shown in FIGS. 17 and 18, the inner / outer joint portions 201 and 202 are substantially in the range of the front-rear direction LD having no side expansion / contraction region SG and the range of the front-rear direction LD having the side expansion / contraction region SG. It can be provided in the same width direction WD range, but it can also be provided in different width direction WD ranges in both ranges. That is, in the latter case, the edge of the waist lower stretchable region A3 on the non-stretchable region A1 side extends stepwise or continuously so as to be located outside the width direction WD from the waist opening WO side toward the crotch side. If so, the positions of the WD in the width direction of the inner and outer joints 201 and 202 may also change from the waist opening WO side to the crotch side.

The dimensions of the WD in the width direction of the inner and outer joints 201 and 202 can be appropriately determined, but usually, the dimensions of the WD in the width direction of the non-stretchable region A1 should be about 80 to 100%, particularly about 90 to 100%. Can be done.

Although not shown, the inner / outer joint portions 201 and 202 have an appropriate shape regardless of the position of the side edge of the waist lower stretchable region A3 on the non-stretchable region A1 side (for example, various shapes described in Patent Document 4 are non-stretchable). It can also be adopted as appropriate regardless of the shape of the region).

(Cover non-woven fabric)
In the exterior two-piece type pants type disposable diaper, the interior body 200 is exposed between the front exterior body 12F and the rear exterior body 12B, so that the liquid permeable sheet 11 is not exposed on the back surface of the interior body 200. It is preferable that the 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 non-woven fabric 13 can be adhered to the facing surfaces via a hot melt adhesive. As the non-woven fabric used for the cover non-woven fabric 13, for example, the same material as that of the exterior bodies 12F and 12B can be appropriately selected.

(Positional relationship between waist lower stretch area and side stretch area)
As shown in FIGS. 2 to 4, 11, 13 and 14, in the front exterior body 12F and the rear exterior body 12B, the inner / outer joint portions 201 and 202 that join the interior body 200 have side expansion / contraction regions SG. In the range of the front-rear direction LD, it is provided over the left and right side expansion / contraction regions SG, and the side expansion / contraction region SG extends toward the waist opening WO side to the position of the front-rear direction LD having the waist lower expansion / contraction region A3, and the waist is lower. In the range A4 of the anteroposterior LD having the stretchable region A3 and the side stretchable region SG, the inner edge of the widthwise WD in the waist lower stretchable region A3 is located outside the widthwise WD with respect to the side stretchable region SG. preferable. As described above, if the structure does not have an overlapping portion between the waist lower expansion / contraction region A3 of the exterior bodies 12F and 12B and the side expansion / contraction region SG of the interior body 200 in the region having the inner / outer joint portions 201 and 202, the vertical and horizontal directions are formed. The unsightly folds formed by the contraction in both directions, and the resulting deterioration of the feel and fit, do not occur. Further, by shifting the range of the waist lower stretchable region A3 laterally within the range having the side stretchable region SG in this way, the range of the side stretchable region SG is limited between the front exterior body 12F and the rear exterior body 12B. This is preferable because it is excellent in fit and lateral leakage prevention.

In particular, when the positional relationship between the waist lower stretch region A3 and the side stretch region SG is applied to at least the rear exterior body 12B, the contraction of the waist lower stretch region A3 is reduced at the portion in contact with the bulge of the wearer's buttocks. Therefore, the fit to the buttocks is improved, and the interior body 200 is less likely to bite into the buttocks, which is preferable. However, of course, the positional relationship between the waist lower expansion / contraction region A3 and the side expansion / contraction region SG may be applied only to the front exterior body 12F.

The side expansion / contraction region SG extends only to the position of the front-rear direction LD of one waist lower elastic member 16 and 19 on the most crotch side as long as it extends to the position of the front-rear direction LD having the waist lower extension / contraction region A3. May be good. However, it is desirable that the side expansion / contraction region SG extends to the position of the LD in the front-rear direction of the second and subsequent waist lower elastic members 16 and 19 counting from the crotch side.

Further, the inner edge of the width direction WD in the waist lower stretch region A3 is also the side stretch region SG in the waist side range A5 outside the front-rear LD range A4 having the waist lower stretch region A3 and the side stretch region SG. It can be located outside the WD in the width direction. However, as shown in the illustrated example, if the inner edge of the width direction WD of the waist side range A5 is located inside the width direction WD than the outer edge of the width direction WD of the side expansion / contraction region SG, the leg opening It is preferable because the continuity of the expansion / contraction region A2 along the LO is increased and the fit of the leg opening LO is further improved.

In the range A4 of the anteroposterior LD having the waist lower stretch region A3 and the side stretch region SG, it is preferable that the distance between the side stretch region SG and the waist lower stretch region A3 is narrower, and in particular, the side stretch region SG and the waist in the width direction WD are preferable. When the distance d from the lower expansion / contraction region A3 is 10 mm or less, more preferably 5 mm or less, the continuity of the expansion / contraction region A2 along the leg opening LO becomes particularly high, and the fit of the leg opening LO becomes particularly preferable.

As described above, if the side elastic member 73 is not provided on the side edge portion of the side flap 70 portion (the outer edge portion in the width direction WD), the side edge portion of the side flap 70 is less likely to hit the wearer's leg tightly. Therefore, it is preferable. In this case, as shown in FIGS. 11, 13 and 14, in the range A4 of the anteroposterior LD having the waist lower stretch region A3 and the side stretch region SG, the waist lower stretch region A3 is extended to the side edge of the side flap 70. It is preferable to extend the extension because the continuity of the expansion / contraction region A2 along the leg opening LO is increased. Of course, as shown in FIGS. 15 and 16, it is not necessary to extend the waist lower expansion / contraction region A3 to the side edge portion of the side flap 70.

If the continuity of the side elastic region SG and the waist downward elastic region A3 is emphasized, the side edges of the inner and outer joints 201 and 202 are the most, as shown in FIGS. 9, 10, 12, 17 and 18. It is desirable that the side elastic member 73 located outside the WD in the width direction is located outside. However, as shown in FIGS. 4, 11, 13 and 14, the side edges of the inner / outer joints 201 and 202 are inside the widthwise WD than the side elastic member 73 located most outside the widthwise WD. It is also preferable that it is located. In this case, at least the outer end of the side expansion / contraction region SG in the width direction WD is contracted without being supported by the exterior bodies 12F and 12B, so that the side expansion / contraction region SG does not easily hit the wearer's legs. ..

(Non-woven fabric)
As the non-woven fabric in the above 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, even if the constituent fibers of the non-woven fabric are hydrophilic fibers (including hydrophobic fibers made hydrophilic by the hydrophilic agent), they are either hydrophobic fibers or water-repellent fibers (water-repellent fibers made water-repellent by the water-repellent agent). It may be (including aqueous fibers). 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.

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

・ "Front side" means the person closer to the wearer's skin when wearing a pants-type disposable diaper, and "back side" means the person farther from the wearer's skin when wearing a pants-type disposable diaper. ..

・ "Front side" means the side of the member that is closer to the wearer's skin when wearing a pants-type disposable diaper, and "back side" means the side of the member that is closer to the wearer's skin when wearing a pants-type disposable diaper. It means the far side.

-"Elongation rate" means a value when the natural length is 100%. 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 produced gel is left in a constant temperature and humidity chamber at 40 ° C. × 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500 manufactured by I. techno Engineering).

・ "Metsuke" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to bring it to a constant weight. Pre-drying refers to making a sample or test piece constant in an environment at a temperature of 100 ° C. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. A sample having a size of 100 mm × 100 mm is cut out from the test piece in a constant weight state using a sampling template (100 mm × 100 mm). The weight of the sample is measured and multiplied by 100 to calculate the weight per square meter, which is used as the basis weight.

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

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

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

-"Unfolded state" means a state in which the unfolded state is flat without shrinkage or slack.

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

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

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

11 ... Liquid permeable sheet, 12A ... Side seal part, 12B ... Rear exterior body, 12E ... Waist extension part, 12F ... Front exterior body, 12F, 12B ... Exterior body, 12H ... Inner sheet layer, 12S ... Outer sheet Layer, 13 ... Cover non-woven fabric, 15, 19 ... Waist lower elastic member, 17 ... Waist elastic member, 18 ... Unnecessary elastic member, 200 ... Interior body, 201, 202 ... Inner / outer joint, 30 ... Top sheet, 40 ... Intermediate sheet , 50 ... Absorbent element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Rise gather, 60A ... Tip side part, 60B ... Base side part, 62 ... Gather sheet, 63 ... Gather elastic member, 67 ... Folded part, 68 ... Rising part, A1 ... Non-stretchable area, A2 ... Stretchable area, A3 ... Waist lower stretchable area, A4 ... Waist lower stretchable area A3 and front-back LD range having side stretchable area SG, A5 ... Waist side range, L ... Intermediate area, LD ... front-back direction, SG ... side expansion / contraction area, T ... waist circumference area, U ... waist lower part, W ... waist part, WD ... width direction, WO ... waist opening, LO ... leg opening, P1 ... first Part, P2 ... 2nd part, HM ... Hot melt adhesive, 70 ... Side flap, 71 ... 1st sheet layer, 72 ... 2nd sheet layer, 73 ... Side elastic member, 74 ... Outermost sheet layer, 75 ... The innermost sheet layer, 76 ... internal sheet layer, 77 ... non-joint part, 79 ... dedicated sheet material, 80 ... hollow part, F ... front body, B ... back body.

Claims (10)

On both sides of the crotch, there are side flaps that do not have an absorber,
The side flap has a side telescopic region in which one or more elongated side elastic members are provided along the front-rear direction and at intervals from each other.
In disposable wear items
The side flap has a hollow portion extending in the front-rear direction along its side edge.
Due to the contraction of the side elastic member, the portion of the side flap including the hollow portion contracts in the front-rear direction to form side gathers.
Disposable wear goods characterized by that. The hollow portion extends from the side edge of the side flap to a position separated from the side edge in the width direction by 2 mm or more.
The disposable wearable article according to claim 1. The portion of the side flap from the side edge to the center side in the width direction of 2 to 15 mm does not include the side elastic member and includes a part or all of the hollow portion.
The disposable wearable article according to claim 1 or 2. At least one side elastic member is provided on the front side of the hollow portion.
The disposable wearable article according to any one of claims 1 to 3. A plurality of the hollow portions are provided so as to overlap each other in the thickness direction.
The disposable wearable article according to any one of claims 1 to 4. The side flap has a folded sheet layer that is folded back at the side edge of the side flap from the front side of the hollow portion to the back side of the hollow portion.
The hollow portion extends laterally to the folded position of the folded sheet layer.
The disposable wearable article according to any one of claims 1 to 5. The side flaps have a double folded sheet layer folded back at the side edges of the side flaps.
The outermost sheet layer and the innermost sheet layer in the side flap are a front side portion and a back side portion with the folded position of the folded sheet layer located on the outside as a boundary, respectively.
The width of the side elastic member is wider than the folding position between the front side portion with the folding position of the folded sheet layer located outside as a boundary and the front side portion with the folding position of the folded sheet layer located inside as a boundary. It is fixed at a position away from the center of the direction,
Between the side elastic member located most laterally and the side edge of the side flap, a hollow portion is formed between the sheet layers because all the sheet layers adjacent to each other in the thickness direction are not joined. ing,
The disposable wearable article according to any one of claims 1 to 5. The rising gathers that rise from the position on the center side in the width direction of the side elastic member extend along the front-rear direction.
The rising gather includes a gather sheet that is folded in half at the tip portion to form a two-layer structure, and an elongated gather elastic member provided along the front-rear direction between layers of the two-layer structure at least at the tip portion. Have and
Both sides of the side flaps are a first portion in which a two-layer structure made of the gathered sheet extends from the starting point to a side edge of the side flap, and a two-layer structure made of the gathered sheet is folded back at the side edge of the side flap. It has a second part that extends toward the center in the width direction.
The double folded sheet layer is the first portion and the second portion of the gather sheet.
The disposable wearable article according to claim 7. A plurality of the side elastic members are provided at intervals in the width direction.
The elongation rate of the side elastic member in the side expansion / contraction region in the unfolded state is lower as it is located laterally.
The disposable wearable article according to any one of claims 1 to 8. An exterior body that constitutes at least the waistline of the front and back bodies, an interior body with a built-in absorber attached to the exterior body from the front body to the back body, a waist opening, and a pair of left and right A pants-type disposable wear item with a leg opening.
The side flaps are provided on both sides of the interior body.
The disposable wearable article according to any one of claims 1 to 9.

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