JP7362393B2 - Disposable wearing items - Google Patents

Description

The present invention relates to a disposable wearing article that has improved feel (flexibility, cushioning properties) on the sides of the crotch area.

One of the typical examples of disposable wearing articles is a pants-type disposable diaper. The pants-type disposable diaper includes an exterior body that constitutes at least the waist circumference of the front body and the back body, and an interior body that includes an absorbent body and is attached to the exterior body so as to extend from the front body to the back body, Generally, both sides of the front body exterior body and both sides of the back body exterior body are joined to form a side seal, thereby forming a waist opening and a pair of left and right leg openings. (For example, see Patent Document 1).

In some conventional pants-type disposable diapers, the sides of the crotch area were formed only by the outer body, but recently, the sides of the crotch area are increasingly formed by the sides of the inner body. (For example, see Patent Document 1).

So-called tape-type disposable diapers (see Patent Documents 2 to 4) are also one of the representative examples of disposable wearing articles. A typical tape type disposable diaper has a crotch area including the center in the front-rear direction, a ventral part extending forward from the center in the front-rear direction, and a dorsal part extending rearward from the center in the front-rear direction. The side portion has a main body portion located between the left and right wing portions, and at least the dorsal portion has a wing portion that extends from the groin portion to the left and right sides in the width direction, and the wing portion is located on the outer surface of the ventral portion. It has a connection part that is detachably connected to the. In use, the wing portions are rotated from either side of the waist to the outer surface of the ventral portion to connect the connecting portions of the wing portions to the outer surface of the ventral portion.

Conventionally, tape-type disposable diapers are of an integrated type, in which side flaps extending laterally from the side edges of the absorbent body are cut off along the leg circumference, and the uncut portions are left as wing parts (for example, in patent literature In addition to the type (see Patent Documents 3 and 4), there are also known separate types in which a separately manufactured connecting tape is attached to the side edge of the assembly forming the main body part, and this connecting tape forms the wing part. There is. Furthermore, as a separate type, a unit including left and right wing portions is attached to an assembly forming the main body portion (for example, see Patent Document 6).

In such a tape type disposable diaper, the sides of the crotch region are formed by the sides of the side flaps.

By the way, in order to ensure a good fit for the legs, these disposable wearing articles incorporate an elongated elastic member between the sheet layers on the side of the crotch area along the direction around the legs or in the front-rear direction. It is known.

However, with conventional disposable wearable articles, when the product is worn or purchased, when the product is held in the hand or while being worn, the feel of the side of the groin area, especially the flexibility and cushioning properties (compression) of the sheet layer on the side of the groin area. There was room for improvement in terms of resiliency.

Japanese Patent Application Publication No. 2006-122396 Japanese Patent Application Publication No. 2016-083077 Japanese Patent Application Publication No. 2010-22550 Japanese Patent Application Publication No. 2011-72736

Therefore, the main object of the present invention is to improve the feel of the side part of the crotch area.

Disposable wearing articles that have solved the above problems are as follows.
<First aspect>
Has side flaps without absorbent material on both sides of the crotch area,
The side flap is a part having an elongated side elastic member along the front-rear direction, and a first part located on the absorber side, and a part having an elongate side elastic member along the front-rear direction. , and a second portion located laterally than the first portion,
In the first part, a plurality of sheet layers are laminated, the side elastic member is fixed to the outermost sheet layer, and a front side hollow part is not provided on the front side of the side elastic member. ,
In the second portion, three or more sheet layers are laminated, and an inner sheet layer is interposed between the side elastic member and the outermost sheet layer. A front hollow part that continues in the front-rear direction is provided between the sheet layer and the
Due to contraction of the side elastic member, a portion of the side flap including the first portion and the second portion contracts in the front-rear direction, forming a side gather that can be elastically expanded in the front-rear direction.
A disposable wearing article characterized by:

(effect)
In this disposable wearing article, the contraction of the side elastic member causes the portion of the side flap including the first portion and the second portion to contract in the front-rear direction, so that each fold of the side gathers is formed in a line in the front-rear direction. Here, when the side gathers are formed in the second portion, the pleats of the side gathers are formed by the front side hollow portion greatly expanding toward the front side, and the side gathers become large and soft (that is, rich in cushioning properties). Therefore, due to these large and soft folds, the side part of the crotch area feels good to the touch (it becomes plump and fluffy).
However, if large folds are formed on the entire front side of the side flap due to the front side hollow portion, a gap is likely to occur between the side flap and the wearer's skin.
Therefore, in the present disposable wearing article, in the first part located on the absorber side, the side elastic member is fixed to the outermost sheet layer, and no front hollow part is provided on the front side of the side elastic member, so that the side elastic While reducing the folds formed by the member and ensuring firm contact with the skin, the side elastic member is used in the second part located on the side of the first part for the side part that affects the feel more. By interposing an inner sheet layer between the inner sheet layer and the outermost sheet layer to provide a hollow section on the front side, large soft folds are formed and the texture is good.

<Second aspect>
In the first part and the second part, an inner sheet layer is interposed between the side elastic member and the backmost sheet layer, and an inner sheet layer is interposed between the inner sheet layer and the backmost sheet layer. A hollow part is provided on the back side.
Disposable wearing article according to the first aspect.

(effect)
In this disposable wearing article, adhesion to the skin on the back side of the side flaps is not a problem. Therefore, by providing a back hollow part on the back side of the side elastic member in both the first part and the second part as in this embodiment, and forming large and soft folds over a wider range, the outer surface of the product has a good feel to the touch. Become.

<Third aspect>
The side flap has a third portion between the side edge and the second portion, in which a plurality of sheet layers are laminated,
The third portion does not have the side elastic member and has a hollow tip.
The disposable wearing article according to the first or second aspect.

(effect)
The second portion may be provided up to the side edge of the side flap, but if it does not have a side elastic member as in this embodiment and has a third portion having a hollow tip, the second portion may extend up to the side edge of the side flap. Under the influence of contraction in the front-rear direction, the third portion also contracts, forming larger and softer folds, which is particularly preferable because the wearer's legs feel soft against the skin.

<Fourth aspect>
A plurality of the side elastic members are provided at intervals of 5 to 10 mm in the width direction,
The first portion and the second portion are contracted by the side elastic members and can be expanded in the front-rear direction to an elongation rate of 150 to 300%,
The widthwise dimension of the third portion is 0.08 to 0.3 times the widthwise dimension of the side flap.
Disposable wearing article according to the fourth aspect.

(effect)
When the aforementioned third portion is provided, it is particularly preferable that the elongation ratios of the first portion and the second portion and the width of the third portion are within the range of this embodiment.

<Fifth aspect>
The side flap has double folded sheet material folded back at the side edge of the side flap,
The frontmost sheet layer and the backmost sheet layer in the side flap are the front sheet layer and the back sheet layer, respectively, with the folding position of the folded sheet material located outside as the boundary,
The side elastic member of the first portion is arranged between a sheet layer on the front side with the folding position of the folded sheet material located on the outside as a boundary and a sheet layer on the front side with the folding position of the folded sheet material located on the inside as the boundary. It is fixed to
The side elastic member of the second portion is fixed between the front sheet layer and the back sheet layer with the folding position of the folded sheet material located inside as a boundary,
In the second portion, the sheet layer on the front side with the folding position of the folded sheet material located on the outside as a boundary and the sheet layer on the front side with the folding position of the folded sheet material located on the inside as the boundary are not joined. , a front hollow portion is formed on the front side of the side elastic member in the second portion;
The disposable wearing article according to any one of the first to fourth aspects.

(effect)
This disposable wearing article forms the above-mentioned first portion and second portion by arranging double folded sheet materials on the side flaps. In this case, since each of the double folded sheet materials has a restoring force against folding, pleats having better cushioning properties can be formed in the side flap using less sheet material.

<Sixth aspect>
The sheet layer on the back side with respect to the folding position of the folded sheet material located inside is not joined to the sheet layer on the back side with the folding position of the folded sheet material located on the outside as a boundary, so that the first portion and a back side hollow part is formed on the back side of the side elastic member in the second part.
The disposable wearing article according to the fifth aspect.

(effect)
According to this aspect, similarly to the second aspect, the back side hollow portion can be provided on the back side of the side elastic member in both the first portion and the second portion with less sheet material.

<Seventh aspect>
The folding position of the folded sheet material located inside is further away from the folding position of the folded sheet material located outside to the center side in the width direction,
The front sheet layer and the back sheet layer are not joined to each other at the folding position of the external folding sheet material on the side of the folding position of the folding sheet material located inside, so that the tip hollow part is formed. is formed,
The disposable wearing article according to the fifth or sixth aspect.

(effect)
According to this aspect, the third portion of the third aspect can be provided with less sheet material.

<Eighth aspect>
an exterior body that constitutes at least the waist circumference of the front body and the back body; an interior body that is attached to the exterior body so as to span from the front body to the back body and that contains an absorbent body; a waist opening; and a pair of left and right A pants-type disposable wearing article comprising leg openings,
The inner body has the side flaps on both sides,
The disposable wearing article according to any one of the first to seventh aspects.

(effect)
When applied to a pants-type disposable wearing article, it is desirable to provide the above-mentioned side flaps on both sides of the inner body.

According to the present invention, advantages such as improved feel on the side of the crotch region are brought about.

FIG. 2 is a plan view showing the inner surface of the pant-type disposable diaper in an unfolded state. FIG. 2 is a plan view showing the outer surface of the pant-type disposable diaper in an unfolded state. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 2 is a sectional view taken along line 3-3 in FIG. 1. FIG. (a) A 4-4 sectional view in FIG. 1, and (b) a 5-5 sectional view in FIG. 1. FIG. 1 is a perspective view of a pants-type disposable diaper. FIG. 3 is a plan view showing the outer surface of the interior body in an expanded state together with the outline of the exterior body. FIG. 3 is a plan view showing the outer surface of the interior body in an expanded state together with the outline of the exterior body. FIG. 4 is an enlarged sectional view of the main part of FIG. 3; 2 is a sectional view of another example corresponding to the 2-2 section in FIG. 1. FIG. 2 is a sectional view of another example corresponding to the 2-2 section in FIG. 1. FIG. (a) A sectional view of another example corresponding to the 4-4 cross section in FIG. 1, and (b) a sectional view of another example corresponding to the 5-5 cross section in FIG.

Hereinafter, a pants-type disposable diaper will be explained in detail as an example of a disposable wearing article with reference to the accompanying drawings. The dotted pattern in the cross-sectional view indicates the adhesive used as a joining means for joining each component located on the front and back sides, and may be solid, bead, curtain, summit, or spiral application of hot melt adhesive, or pattern coating. (transferring hot melt adhesive using a letterpress method), or alternatively or in addition to this, the fixed part of the elastic member is formed by applying it to the outer circumferential surface of the elastic member using a comb gun or SureWrap coating. be. Examples of hot melt adhesives include EVA adhesives, adhesive rubber adhesives (elastomer adhesives), olefin adhesives, and polyester/polyamide adhesives, which can be used without particular limitation. As a joining means for joining each component, means by material welding such as heat sealing or ultrasonic sealing can also be used.

1 to 6 show an example of a pants-type disposable diaper. This pants-type disposable diaper includes 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 rectangular rear exterior body 12B that constitutes at least the waist circumference of the front body F, and a section between the front body 12F and the crotch. The interior body 200 is provided on the exterior bodies 12F and 12B so as to extend through the rear exterior body 12B through the rear exterior body 12B. Both sides of the front exterior body 12F and both sides of the rear exterior body 12B are joined to form a side seal portion 12A, which allows the opening formed by the front and rear ends of the exterior bodies 12F and 12B to be opened to the wearer. A waist opening WO through which the torso passes is formed, and a portion surrounded by the lower edges of the exterior bodies 12F, 12B and the side edges of the interior body 200 on both widthwise sides of the interior body 200 serves as a leg opening LO through which the legs are passed. The inner body 200 is a part that absorbs and holds excrement such as urine, and the outer bodies 12F and 12B are parts that support the inner body 200 against the wearer's body. Further, the symbol 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 in the front body F to the edge of the waist opening WO in the back body B), and the symbol X indicates the diaper in the unfolded state. The full width is shown.

This pants-type disposable diaper has a waist area T defined as a front-back range (a front-back range from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a front-back direction of the part forming the leg opening LO. It has an intermediate region L defined as a range (between the front-rear region having the side seal portion 12A of the front body F and the front-rear region having the side seal portion 12A of the back body B). The waist region T can be conceptually divided into a "waist region" W forming the edge of the waist opening, and a "lower waist region" U being a region below this. Normally, when the waist area T has a boundary where the elastic stress in the width direction WD changes (for example, the thickness or elongation rate of the elastic member changes), the waist opening WO side is closer to the waist than the boundary closest to the waist opening WO. If there is no such boundary, the waist extending portion 12E that extends toward the waist opening WO from the absorbent body 56 or the inner body 200 becomes the waist portion W. These lengths in the front-rear direction vary depending on the size of the product and can be determined as appropriate. For example, the waist part W can be 15 to 40 mm, and the lower waist part 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 these are the parts into which the wearer's legs are inserted. As a result, the pant-type disposable diaper in the unfolded state has an approximately hourglass shape as a whole.

(Interior body)
Although the interior body 200 can take any shape, the illustrated example has a substantially rectangular shape. As shown in FIGS. 3 to 5, the interior body 200 includes a top sheet 30 facing the body, a liquid-impermeable sheet 11, and an absorbent element 50 interposed between these. It is responsible for the absorption function. Reference numeral 40 indicates an intermediate sheet provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50, and reference numeral 60 indicates an intermediate sheet provided between the top sheet 30 and the absorbent element 50. In order to prevent excrement from leaking to both sides of the inner body 200, riser gathers 60 are shown extending from both sides of the inner body 200 so as to come into contact with the wearer's legs.

The dimension of the inner body 200 in the width direction WD can be determined as appropriate, and may be, for example, 1 to 2 times the dimension of the absorbent body 56 in the width direction WD.

(Top sheet)
The top sheet 30 has a property of permeating liquid, and may be made of, for example, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, and the like. Further, the top sheet 30 may be made of a single sheet, or may be made of a laminated sheet obtained by laminating two or more sheets together. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

Both side portions of the top sheet 30 may be folded back at the side edges of the absorbent element 50, or may be allowed to protrude laterally from the side edges of the absorbent element 50 without being folded back.

The top sheet 30 may be fixed to a member adjacent to the back side using a bonding means such as heat sealing or ultrasonic sealing or hot melt adhesive for the purpose of preventing misalignment with respect to the back side member. 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 through the top sheet 30 to the absorbent body, an intermediate sheet (also called a "second sheet") 40, which has a higher liquid permeation rate than the top sheet 30, can be provided. This intermediate sheet 40 is for quickly transferring the liquid to the absorber 56 to improve the absorption performance of the absorber 56, and to prevent the absorbed liquid from flowing back from the absorber 56. The intermediate sheet 40 can also be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bonded nonwoven fabric, or crepe paper. In particular, air-through nonwoven fabrics are preferred because they are bulky. It is preferable to use a composite fiber with 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) with 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 fibers of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use eccentric fibers whose core is not in the center, hollow fibers, or eccentric and hollow fibers as the mixed fibers for all or part of the raw material fibers.

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

The intermediate sheet 40 may be fixed to a member adjacent to the back side using a bonding means such as heat sealing or ultrasonic sealing or hot melt adhesive for the purpose of preventing misalignment of the intermediate sheet 40 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 includes, for example, a plastic film made of olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric with a plastic film on the surface of the nonwoven fabric, and a plastic film. Examples include laminated sheets in which nonwoven fabrics and the like are laminated and bonded. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impermeable and moisture-permeable material that is preferred from the viewpoint of preventing stuffiness. Moisture-permeable plastic films include microporous plastic films obtained by kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching it uniaxially or biaxially. is widely used. Other methods include non-woven fabrics using micro-denier fibers, strengthening leak-proofing by reducing fiber pores by applying heat or pressure, and coating with super absorbent or hydrophobic resins or water repellent agents. Accordingly, a liquid-impermeable sheet without using a plastic film can also be used as the liquid-impermeable sheet 11, but it must have sufficient adhesive strength when bonded to the cover nonwoven fabric 13 via a hot melt adhesive, which will be described later. In order to obtain this, it is desirable to use a resin film.

The liquid-impermeable sheet 11 has a width that fits on the back side of the absorbent element 50 as shown in the figure, and also wraps around both sides of the absorbent element 50 so as to fit on the side surface of the top sheet 30 of the absorbent element 50 in order to improve leakage prevention. It can also extend to both sides. The appropriate width of this extending portion is about 5 to 20 mm on each side.

(absorption element)
The absorbent element 50 includes an absorbent core 56 and a packaging sheet 58 that completely wraps around the absorbent core 56. The packaging sheet 58 can also be omitted.

(Absorber)
The absorbent body 56 can be formed from an aggregate of fibers. These fiber aggregates include those obtained by stacking short fibers such as cotton pulp and synthetic fibers, as well as filament aggregates obtained by opening tows (fiber bundles) of synthetic fibers such as cellulose acetate as necessary. can also be used. The fiber weight can be, for example, about 100 to 300 g/m ² when stacking cotton-like pulp or short fibers, and about 30 to 120 g/m ² in the case of filament aggregates. Can be done. The fineness of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament assembly, the filaments may be non-crimped fibers, but are preferably crimped fibers. The degree of crimps of the crimped fibers can be, for example, about 5 to 75 crimps, preferably 10 to 50 crimps, and more preferably 15 to 50 crimps per 2.54 cm. Further, crimped fibers that are uniformly crimped can be used. Preferably, superabsorbent polymer particles are dispersed and retained in the absorbent body 56.

The absorbent body 56 may have a rectangular shape, but as shown in FIG. This is preferable because the fit of the riser gathers 60 around the legs is improved.

Although the dimensions of the absorbent body 56 can be determined as appropriate, it is preferable that the absorbent body 56 extends from a position overlapping with the front exterior body 12F through the crotch region to a position overlapping with the rear exterior body 12B, and as shown in the example shown in FIG. And in the width direction WD, it can be extended to the peripheral edge of the interior body 200 or the vicinity thereof. In addition, the code|symbol 56X has shown the full width of the absorber 56.

(Super absorbent polymer particles)
The absorbent body 56 can contain superabsorbent polymer particles in part or in whole. The term "superabsorbent polymer particles" includes "powder" in addition to "particles." As the superabsorbent polymer particles, those used in this type of disposable diapers can be used as they are. It is desirable that the proportion of particles remaining in the sieve is 30% by weight or less, and the particles that fall under the sieve are sieved using a 180 μm standard sieve (JIS Z8801-1:2006) (shaking for 5 minutes). It is desirable that the proportion of particles remaining on the sieve is 60% by weight or more.

Although any material can be used for the superabsorbent polymer particles without particular limitation, those with a water absorption of 40 g/g or more are preferred. Superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles, including starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and cross-linked sodium carboxymethyl cellulose. Materials such as acrylic acid (salt) and acrylic acid (salt) polymers can be used. The shape of the superabsorbent polymer particles is preferably a commonly used powder or granule, but other shapes can also be used.

As the superabsorbent 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 liquid supplied into the absorbent body 56 tends to return to the outside of the absorbent body 56, which is called backflow.

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

The basis weight of the superabsorbent polymer particles can be determined as appropriate depending on the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be generalized, it can be set at 50 to 350 g/m ² . If the basis weight of the polymer is less than 50 g/m ² , it becomes difficult to ensure sufficient absorption. When it exceeds 350 g/m ² , the effect is saturated.

(packaging sheet)
When the packaging sheet 58 is used, tissue paper, especially crepe paper, nonwoven fabric, polylaminated nonwoven fabric, a perforated sheet, etc. can be used as the material. However, it is desirable that the sheet be a sheet that does not allow the superabsorbent polymer particles to escape. When using a nonwoven fabric instead of crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and its material may be polypropylene, polyethylene/polypropylene composite, or the like. The basis weight is preferably 5 to 40 g/m ² , particularly 10 to 30 g/m ² .

The packaging structure of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of superabsorbent polymer particles from the front and rear edges, a cylinder is used to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable to wrap the absorbent body into a shape, with its front and rear edges protruding from the front and rear sides of the absorber 56, and to join the overlapping portions and the overlapping portions of the front and rear protruding portions using a joining means such as hot melt adhesive or material welding.

(get up and gather)
The rising gathers 60 has a rising portion 68 that rises from the side of the interior body 200, and this rising portion 68 comes into contact with the range from the wearer's groin area through the leg area to the buttocks to prevent side leakage. It is something. In the illustrated rising gathers 60, the base portion 60B stands up obliquely toward the center in the width direction, and the tip end portion 60A stands up obliquely toward the outside in the width direction from the middle portion. It is not limited to this, and appropriate changes can be made, such as one that stands up on the center side in the width direction as a whole.

To explain in more detail, the raised gathers 60 in the illustrated example is made by folding a band-shaped gather sheet 62 having a length equal to the length of the interior body 200 in the front-rear direction in the width direction WD at the tip and folding it in half. In addition to overlapping, a plurality of elongated gather elastic members 63 are fixed at intervals in the width direction WD in a stretched state along the longitudinal direction between the folded portions and the sheets in the vicinity thereof. A base end portion of the rising gathers 60 located on the opposite side to the tip portion (an end portion on the opposite side to the sheet folded portion in the width direction WD) 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 (portion on the folded portion side) extending from the root portion 65. Further, the main body portion 66 includes a root portion 60B extending toward the center in the width direction, and a tip portion 60A that is folded back at the tip of the root portion 60B and extending outward in the width direction. Both end portions of the main body portion 66 in the front and back direction are set as a collapsed portion 67 that is fixed to the side surface of the top sheet 30 in a collapsed state, while the intermediate portion in the front and rear direction located between these ends is not fixed. A gathered elastic member 63 along the front-rear direction LD is fixed to at least the distal end portion of the rising portion 68 in an extended state.

In the rising gathers 60 configured as described above, the rising portion 68 rises to come into contact with the skin as shown by the arrow in FIG. 3 due to the contraction force of the gather elastic member 63.

Like the rising gathers 60 in the illustrated example, the main body portion 66 is bent to consist of a root side portion 60B that extends toward the center in the width direction, and a tip side portion 60A that is folded back at the tip of this root side portion 60B and extends outward in the width direction. In the structure, the tip side portion 60A and the base side portion 60B are joined in a laid down state at the laid down portion 67, and the base side portion 60B is joined to the top sheet 30 in a laid down state. For joining the opposing surfaces in the collapsed portion 67, at least one of hot melt adhesives using various coating methods and material welding methods 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 be joined using a hot melt adhesive, and that the tip side portion 60A and the root side portion 60B be joined by material welding.

The gather sheet 62 is made of a flexible nonwoven fabric with excellent uniformity and hiding properties, such as spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), meltblown nonwoven fabric, etc., and if necessary, repellent with silicone or the like. Those subjected to water treatment can be suitably used. In this case, the fiber basis weight of the nonwoven fabric is preferably about 10 to 30 g/m ² . As the gather elastic member 63, a rubber thread or the like can be used. When using spandex rubber thread, the thickness is preferably 470 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, more preferably 3 to 5. The appropriate spacing between the gather elastic members 63 is 3 to 10 mm. With this configuration, the area in which the gathered elastic member 63 is arranged can easily come into contact with the skin. 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 gathers 60, hot melt adhesive, heat sealing, and ultrasonic waves are applied by various application methods to bond the inner and outer layers of the gather sheet 62 and to fix the gather elastic member 63 sandwiched therebetween. At least one of fixing means by material welding, such as a seal, can be used. If the entire surfaces of the inner layer and outer layer of the gather sheet 62 are bonded together, the flexibility will be lost, so it is preferable that the portions of the gather elastic member 63 other than the bonded portions are not bonded or bonded weakly. In the illustrated example, the gathered elastic member 63 is coated with hot melt adhesive only on the outer peripheral surface of the gathered elastic member 63 using a coating means such as a comb gun or a sure wrap nozzle, and is sandwiched between the inner and outer layers of the gathered sheet 62. The structure is such that the gather elastic member 63 is fixed to the inner layer and outer layer of the gather sheet 62, and the inner layer and outer layer of the gather sheet 62 are fixed using only the hot melt adhesive applied to the outer peripheral surface of the gather sheet 62. There is.

Similarly, for fixing the collapsed portion 67, at least one of hot melt adhesives using various coating methods and material welding methods such as heat sealing and ultrasonic sealing can be used.

(side flap)
Side flaps 70 extending to the sides of the absorbent body 56 are provided on both sides of the interior body 200. As shown in the illustrated example, each side flap 70 is preferably a flat portion that extends only laterally without folding back or the like. The dimension of each side flap 70 in the width direction WD can be determined as appropriate, and can be set to, for example, 0.1 to 0.2 times the dimension of the interior body 200 in the width direction WD.

As shown in FIG. 9, each side flap 70 is a portion having an elongated side elastic member 75 along the front-rear direction LD, and has a first side elastic member 75 located on the absorber 56 side (center side in the width direction WD). It has a portion P1 and a second portion P2 which is a portion having an elongated side elastic member 75 along the front-rear direction LD and is located laterally than the first portion P1. In the first portion P1, four sheet layers are stacked, a side elastic member 75 is fixed to the sheet layer 71 on the outermost side, and a front hollow portion H1 is provided on the front side of the side elastic member 75. In the second portion P2, four sheet layers are laminated, and an inner sheet layer 76 is interposed between the side elastic member 75 and the outermost sheet layer 71. Between the sheet layer 76 and the frontmost sheet layer 71, a front side hollow portion H1 that continues continuously (or may be intermittent) in the front-rear direction LD is provided.

As a result, in the present side flap 70, the portion of the side flap 70 including the first portion P1 and the second portion P2 contracts in the front-rear direction LD, and each fold of the side gathers that can be elastically expanded in the front-rear direction LD It is formed in line with the LD. Here, in the first portion P1 located on the side of the absorber 56, the side elastic member 75 is fixed to the sheet layer 71 on the outermost side, and since there is no front side hollow part H1 on the front side of the side elastic member 75, the side The folds formed by the elastic member 75 become smaller and tightly adhere to the skin. Regarding the side portions that have a greater influence on the feel, an inner sheet layer 76 is interposed between the side elastic member 75 and the sheet layer 71 on the outermost side in the second portion P2 located on the side of the first portion P1. By providing the front side hollow portion H1, as shown in FIG. 6, the folds formed by the side elastic members 75 become large and soft (that is, rich in cushioning properties). Therefore, due to these large and soft folds, the side part of the crotch area feels good to the touch (it becomes plump and fluffy).

The sheet material forming the sheet layers 71 to 74 of the side flap 70 is not particularly limited, and any suitable nonwoven fabric can be selected, such as the nonwoven fabric that can be used in the riser gathers 60 described above and the exterior bodies 12F and 12B described above. In the examples shown in FIGS. 3, 4, 9, and 11, the sheet layers 71 to 74 are formed by extending the gather sheet 62 of the rising gathers 60, as described later. As shown in FIG. 10, the side flaps 70 may be constructed by adding a special sheet material 79 other than the rising gathers 60. In the former case, the front and rear ends of the side flaps 70 coincide with the front and rear ends of the rising gathers 60 (that is, in this case, the front and rear ends of the interior body 200), but in the latter case, the front and rear ends of the side flaps 70 coincide with the front and rear ends of the rising gathers 60. It may be located on the center side in the front-rear direction from the end.

A part or all of the sheet layers 71 to 74 of the side flap 70 may be formed of separate sheet materials, or may be formed by folding a single sheet material one or more times. good. The inner sheet layer 76 can be appropriately selected from the above-mentioned gathered sheet 62, the liquid-impermeable sheet 11, or the same nonwoven fabric as the exterior bodies 12F and 12B described later, as well as the above-mentioned gathered sheet 62, It can be formed by extending or folding the liquid-impermeable sheet 11 as appropriate.

The side elastic members 75 are not particularly limited either, 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 75 in the side elastic region SG in the unfolded state is preferably 150 to 350%, more preferably 200 to 270%. The number of side elastic members 75 is preferably 2 to 16, more preferably 6 to 10. The appropriate interval between the side elastic members 75 is 5 to 10 mm. In particular, when a plurality of side elastic members 75 are provided at intervals in the width direction WD, the elongation rate of the side elastic members 75 in the side elastic region SG in the expanded state is lower as the side elastic members 75 are located laterally. This is preferable because the rise of the stretchable region SG toward the skin becomes more gradual, and the side stretchable region SG becomes more likely to be in an appropriate wearing state. If the side elastic region SG rises too tightly, the side flap 70 may fold inward and be caught between the leg and the surface of the disposable wearing article, which may lead to leakage.

The side elastic members 75 can be fixed to the sheet layers 71 to 74 located on both the front and back sides thereof. For bonding the sheet layers 71 to 74 and fixing the side elastic members 75 sandwiched between them, hot melt adhesive HM by various coating methods, fixing means by material welding such as heat sealing or ultrasonic sealing may be used. I can do it. If the bonding area between the sheet layers 71 to 74 is large, the flexibility will be impaired, so it is preferable that the portions of the side elastic members 75 other than the bonded portions are not bonded or are bonded weakly. In the illustrated example, the hot melt adhesive HM is applied only to the outer circumferential surface of the side elastic member 75 using a coating means such as a comb gun or a SureWrap nozzle, and the hot melt adhesive HM is sandwiched between the sheet layers 71 to 74. The fixing of the side elastic member 75 to the sheet layers 71 to 74 located on both the front and back sides of the side elastic member 75 and the bonding of the sheet layers 71 to 74 located on both the front and back sides can be performed using only the hot melt adhesive HM applied to the outer peripheral surface. It is structured to do so.

The attachment range of the side elastic member 75 in the front-rear direction LD, that is, the range of the side elastic region SG in the front-rear direction LD is from a portion overlapping with the front exterior body 12F to a portion overlapping with the rear exterior body 12B, as shown in the illustrated example. Although it is preferable that the Therefore, for example, the front end of the side elastic region SG may be located at the rear end of the front exterior body, or may be located further rearward than this. Similarly, the rear end of the side elastic region SG may be located at the front end of the rear exterior body, or may be located further forward than this. Further, it is also preferable that the range of the side elastic region SG in the front-rear direction LD is the same as the contracted portion by the gather elastic member 63 of the rising gathers 60, or extends further in the front-rear direction.

Although the first portion P1 has four sheet layers 71 to 74 in the illustrated example, it is sufficient that two or more sheet layers are laminated to sandwich the side elastic member 75. Although it is preferable that a plurality of side elastic members 75 are arranged in the first portion P1, only one side elastic member 75 may be provided. The side elastic member 75 of the first portion P1 may be directly fixed to the outermost sheet layer 71 as shown in FIG. 9, or may be fixed directly to the outermost sheet layer 71 as shown in FIG. It may be indirectly fixed via the inner sheet layer 76 that is adhered to the inner sheet layer 76. In any case, with such an arrangement, the side elastic members 75 are joined up to the sheet layer 71 on the most front side, so the front side hollow part H1 is not formed, and therefore a large No folds are formed.

Since adhesion to the skin is not a problem on the back side of the side flap 70, the first portion P1 has an internal sheet layer 76 interposed between the side elastic member 75 and the backmost sheet layer 74 (three or more layers). It is also preferable that a back side hollow portion H2 is provided between this inner sheet layer 76 and the backmost sheet layer 74. In the four-layer structure shown in FIGS. 9 and 11, the side elastic member 75 is fixed between the frontmost sheet layer 71 of the first portion P1 and the second sheet layer 72 adjacent to the back side thereof. By not joining at least one of the second sheet layer 72 and the third sheet layer 73 counted from the front side, and between the third sheet layer 73 and the backmost sheet layer 74, the back side hollow A section H2 can be provided. In addition, in the four-layer structure shown in FIG. 10, the third sheet layer 73 of the first portion P1 and the backmost sheet layer 74 are joined, so that the back side hollow portion H2 is not provided, and the second portion The third sheet layer 73 of P2 and the backmost sheet layer 74 are not bonded to each other, thereby providing a backside hollow portion H2. It is also possible to have a structure in which the back side hollow portion H2 is not provided over the entire side flap 70.

In the illustrated example, the second portion P2 has four sheet layers 71 to 74, but three or more sheet layers are laminated to sandwich the side elastic member 75 and to form the front side hollow portion H1. In addition, it is sufficient that the inner sheet layer 76 is interposed between the side elastic member 75 and the sheet layer 71 on the outermost side. Although it is preferable that a plurality of side elastic members 75 are arranged in the second portion P2, only one side elastic member 75 may be provided. The front hollow portion H1 formed in the second portion P2 can be formed by non-bonding the plurality of sheet layers 71 and 72 on the front side of the side elastic member 75. In other words, the side elastic member 75 is fixed between the sheet layers 72 to 74 located on the back side of the front side hollow portion H1. For example, in the four-layer structure shown in FIGS. 9 to 11, the front-most sheet layer 71 and the second sheet layer 72 adjacent to the back side thereof are not bonded to form the front-side hollow portion H1, and the A side elastic member 75 is fixed between the third sheet layer 72 and the third sheet layer 73, and a side elastic member 75 is fixed between the third sheet layer 73 and the backmost sheet layer 74. The front side hollow part H1 may be formed by the non-joined part 77 of the second sheet layer 72 and the third sheet layer 73. In this case, the frontmost sheet layer 71 and the second sheet layer 72 may be joined or may not be joined (the front side hollow portion H1 may be formed in two stages).

As mentioned above, since adhesion to the skin is not a problem on the back side of the side flap 70, the inner sheet layer 76 is interposed between the side elastic member 75 and the backmost sheet layer 74 in the second portion P2. It is also preferable that a back side hollow portion H2 is provided between this inner sheet layer 76 and the backmost sheet layer 74 (three or more layers). In the four-layer structure shown in FIGS. 9 to 11, the front-most sheet layer 71 and the second sheet layer 72 adjacent to the back side thereof are not bonded to form the front-side hollow portion H1, and the second Since the side elastic member 75 is fixed between the sheet layer 72 and the third sheet layer 73, by not joining the third sheet layer 73 and the backmost sheet layer 74, the back side hollow part H2 can be provided. The back hollow part H2 of the second part P2 may be continuous from the first part P1, or it may be another back hollow part separated from (independent of) the back hollow part H2 of the first part P1. You can.

The second portion P2 may be provided up to the side edge of the side flap 70 as shown in FIG. 11, but as shown in FIGS. If the third part P3 does not have the elastic member 75 and has the hollow tip H3, the third part P3 will also contract due to the influence of the contraction of the second part P2 in the front-rear direction LD, making it larger and softer. This is preferable because the folds are formed and the wearer feels soft to the touch, especially on the wearer's legs.

Since the third portion P3 does not need to fix the side elastic member 75, it is sufficient that two or more sheet layers are laminated to form the tip hollow portion H3. For this reason, in the example shown in FIGS. 9 and 10, the third portion P3 has two layers 71 and 74 without providing the inner sheet layer 76, but in order to further improve the cushioning properties, the third portion P3 is made of four sheet layers. More than one layer may be stacked. The tip hollow part H3 of the third part P3 may be continuous from the front hollow part H1 and the back hollow part H2 of the second part P2, as shown in the illustrated example, or the front hollow part H1 of the second part P2 It may also be another hollow part separated from (independent of) at least one of the hollow part H2 on the back side.

The dimensions in the width direction WD of the first part P1, the second part P2, and the third part P3 may be determined as appropriate, but in normal cases, the dimensions in the width direction WD of the first part P1 are in the width direction of the side flap 70. It can be set to 0.08 to 0.3 times the dimension of WD. The width direction WD dimension of the second portion P2 is 0.08 to 0.3 times the width direction WD dimension of the side flap 70, and 0.4 to 2.5 times the width direction WD dimension of the first portion P1. can do. Further, the dimension of the third portion P3 in the width direction WD can be set to 0.08 to 0.3 times the dimension of the side flap 70 in the width direction WD. For example, in the case of a disposable diaper for infants, the dimension of the third portion P3 in the width direction WD can be about 2 to 15 mm (particularly 5 to 10 mm).

The dimension in the width direction WD of the front side hollow portion H1 can be determined as appropriate, and may be the entire second portion P2, or it may be shorter than the dimension in the width direction WD of the second portion P2, for example, 0.5 to 1.5. It may be doubled, particularly preferably 0.5 to 1 times. The dimension in the width direction WD of the back side hollow portion H2 can be determined as appropriate, and may be the entire first portion P1, or may be shorter than the dimension in the width direction WD of the first portion P1, for example, 0.5 to 4 times, Particularly preferably, the ratio may be 0.5 to 1 times. The dimension in the width direction WD of the hollow tip portion H3 can be determined as appropriate, and may be the entire third portion P3, or it may be shorter than the dimension in the width direction WD of the third portion P3, for example, 0.5 to 1 times. Good too.

The dimensions in the front-rear direction LD of the front side hollow part H1, the back side hollow part H2, and the tip hollow part H3 may be the same or different. The dimensions of the front side hollow part H1, the back side hollow part H2, and the tip hollow part H3 in the front-rear direction LD are preferably 30% or more, particularly 40% or more of the total product length Y. In addition, in the case of a pants-type disposable wearing article in which the front exterior body 12F and the rear exterior body 12B are separated from each other as shown in the example, the front side hollow part H1, the back side hollow part H2, and the tip hollow part H3 are It is preferable that they extend in the front-rear direction LD to positions where they overlap with the exterior body 12B, and may extend over the entire length of the interior body 200 in the front-rear direction LD.

The front side hollow part H1, the back side hollow part H2, and the tip hollow part H3 are such that the sheet layers located on the front side and the back side thereof are not bonded to each other, and at least one side in the width direction WD is closed with a hot melt adhesive HM or the like. It can be formed by As shown in the illustrated example, it is also preferable that at least one edge in the width direction WD of the hollow portions of the front side hollow portion H1, back side hollow portion H2, and tip hollow portion H3 is formed by folding back the sheet material forming the hollow portion. In this case, the cushioning properties of the folds formed in the hollow portion are particularly improved due to the restoring force against folding.

One preferred example is the structure shown in FIGS. 9 and 11. This side flap 70 has a double folded sheet material folded back at its side edge, and the frontmost sheet layer 71 and the backmost sheet layer 74 are folded from the folded sheet material located outside. There is a sheet layer on the front side and a sheet layer on the back side with the position as a boundary. In addition, the side elastic members 75 of the first portion P1 have a sheet layer 71 on the front side with the folding position of the folded sheet material located on the outside as the boundary, and a sheet layer 71 on the front side with the folding position of the folded sheet material located inside as the boundary. 72. Further, the side elastic members 75 of the second portion P2 are fixed between the front sheet layer 72 and the back sheet layer 73 with the folding position of the folded sheet material located inside as a boundary, and the side elastic members 75 of the second portion P2 are , the sheet layer 71 on the front side with the folding position of the folded sheet material located on the outside as a boundary and the sheet layer 72 on the front side with the folding position of the folded sheet material located on the inside as the boundary are not joined, so that the second Front side hollow portions H1 are respectively formed on the front side of the side elastic members 75 in the portion P2. In this case, since each of the double folded sheet materials has a restoring force against folding, pleats having better cushioning properties can be formed in the side flap 70 using less sheet material.

Another preferred example is the structure shown in FIG. This side flap 70 has a double folded sheet material folded back at its side edge, and the frontmost sheet layer 71 and the backmost sheet layer 74 are folded from the folded sheet material located outside. There is a sheet layer on the front side and a sheet layer on the back side with the position as a boundary. In this respect, the structure is the same as the structure shown in FIG. 9, but in the structure shown in FIG. It is fixed between the sheet layer 72 on the front side and the sheet layer 73 on the back side as a boundary, and in the first part P1, the sheet layer 72 on the front side and the sheet layer 72 on the front side are fixed at the folding position of the folded sheet material located inside. The sheet layer 71 is bonded to the sheet layer 71.

Further, in the examples shown in FIGS. 9 and 10, the sheet layer 73 on the back side with the folding position of the folded sheet material located inside as a boundary is the sheet layer 73 on the back side with the folding position of the folded sheet material located outside as a boundary. 74, a back hollow portion H2 is formed on the back side of the side elastic member 75 in the first portion P1 and the second portion P2. Therefore, the back hollow portion H2 can be provided on the back side of the side elastic member 75 in both the first portion P1 and the second portion P2 with less sheet material.

Furthermore, in the examples shown in FIGS. 9 and 10, the folding position of the folded sheet material located inside is closer to the absorber 56 (center side in the width direction WD) than the folding position of the folded sheet material located outside. The front sheet layer 71 and the back sheet layer 74 are separated from each other and are not joined to each other at the folding position of the folding sheet material located on the outside, which is on the side of the folding position of the folding sheet material located on the inside. A tip hollow portion H3 is formed by this. Therefore, in these examples, the third portion P3 having the tip hollow portion H3 can be provided with less sheet material.

As in the example shown in FIG. 9, it is preferable to construct the side flaps 70 using the sheet of the raised gathers 60. That is, the above-mentioned folded sheet material of the side flap 70 has a two-layer structure of the sheet of the rising gathers 60; A two-layer structure of 60 sheets can be formed with a second second layer portion 602 that is folded back at the side edge of the side flap 70 and extends toward the center in the width direction WD.

(Cover non-woven fabric)
In a pant-type disposable diaper with a two-part exterior, 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 nonwoven fabric 13 extending from between the front exterior body 12F and the interior body 200 to between the rear exterior body 12B and the interior body 200. The inner and outer surfaces of the cover nonwoven fabric 13 can be adhered to opposing surfaces, respectively, via a hot melt adhesive. The nonwoven fabric used for the cover nonwoven fabric 13 can be appropriately selected from, for example, the same material as the material of the exterior bodies 12F and 12B.

(exterior body)
The exterior bodies 12F, 12B include a rectangular front exterior body 12F, which is a portion of the front body F that constitutes at least the waist circumference, and a rectangular rear exterior body 12B, which is a portion that constitutes at least the waist circumference of the back 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 (two-piece exterior type). This distance 12d in the front-rear direction can be set to about 40 to 60% of the total length Y, for example. 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 the lower edge of at least one of the front exterior body 12F and the rear exterior body 12B is along the leg circumference. It may be curved like this. Further, as shown in FIG. 12, the exterior bodies 12F and 12B may be integral and continuous from the front body F to the back body B passing through the crotch (exterior integral type).

The exterior bodies 12F, 12B have a waist circumference portion that corresponds to the waist circumference region T and corresponds to a front-back direction range. Moreover, in this example, the front and rear dimensions of the front exterior body 12F and the rear exterior body 12B are the same. As shown in FIG. 8, the longitudinal dimension of the rear exterior body 12B is made longer than the longitudinal dimension of the front exterior body 12F, and a buttock cover portion extending from the waist region T to the intermediate region L side is provided in the rear exterior body 12B. It is also possible to provide a structure in which a portion corresponding to the intermediate region L is not provided in the front exterior body 12F. In this case or on the contrary, although not shown, a groin cover portion extending from the waist region T toward the intermediate region L may also be provided on the front exterior body 12F.

As shown in FIGS. 4 and 5, the exterior bodies 12F and 12B include an inner sheet layer 12H, an outer sheet layer 12S, and elastic members 16 to 19 provided between them. Each sheet layer may be made of a common sheet material or may be made of individual sheet materials. That is, in the case of the former, in part or all of the front exterior body 12F and the rear exterior body 12B, the inside of a single sheet material is folded back at an appropriate position such as the edge of the waist opening WO or 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, the waist portion W has a portion including a folded back portion of the sheet material. For example, in the waist region 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 similar to the sheet material forming the second sheet layer. It wraps around the waist edge of the material and is folded back inside. Further, this folded portion serves as an interior cover layer 12r that extends over the entire width direction of the exterior body up to a position overlapping the end portion of the interior body 200 on the side of the waist opening WO. The interior cover layer 12r may be formed by pasting a special sheet material instead of folding back the sheet material forming the inner sheet layer 12H.

In order to improve the fit around the wearer's waist, the exterior bodies 12F and 12B incorporate elastic members 16 to 19, and an elastic region A2 is formed that elastically expands and contracts in the width direction WD as the elastic members expand and contract. ing. In this elastic region A2, the exterior bodies 12F and 12B contract with the contraction of the elastic member in their natural length state, forming wrinkles or folds, and when the elastic member is stretched in the longitudinal direction, they are completely stretched without wrinkles. Expansion is possible up to a predetermined expansion rate. As the elastic members 16 to 19, in addition to elongated elastic members such as rubber thread (as shown in the drawings), known elastic members such as band-shaped, net-shaped, and film-shaped elastic members can be used without particular limitation. The elastic members 16 to 19 may be made of synthetic rubber such as spandex, or natural rubber.

To explain the elastic members 16 to 19 in the illustrated example in more detail, a plurality of waist elastic members 17 are arranged at intervals in the front-rear direction in the waist portions W of the exterior bodies 12F and 12B so as to be continuous over the entire width direction WD. It is installed with a blank space. Also, one or more of the waist elastic members 17 disposed in the region adjacent to the lower waist portion U may overlap with the interior body 200, or the widthwise central portion that overlaps with the interior body 200. may be provided on both sides of the width direction. The waist elastic member 17 has a thickness of 155 to 1880 dtex, especially 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 1.0 mm). It is preferable to provide about ² to 15, especially about 4 to 10 rubber threads at intervals of 2 to 12 mm, particularly 3 to 7 mm, and this will increase the elongation of the waist portion W in the width direction WD. The ratio is preferably about 150 to 400%, particularly about 220 to 320%. Furthermore, it is not necessary to use the waist elastic members 17 of the same thickness or the same elongation rate in the entire front-rear direction LD of the waist part W. The thickness and elongation rate may be different.

Further, it is preferable that a plurality of waist lower elastic members 15, 19 made of elongated elastic members are attached to the waist lower part U of the exterior bodies 12F, 12B at intervals in the front-rear direction. The waist lower elastic members 15, 19 have a thickness of 155 to 1880 dtex, especially 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 It is preferable to provide about 5 to 30 rubber threads of 1 to 15 mm, ^especially 3 to 8 mm, and the elongation rate of the lower waist part U in the width direction WD is 200 to 350%. In particular, it is preferably about 240 to 300%.

In addition, as shown in FIG. 8, when the buttock cover section C is provided on the rear exterior body 12B as described above, or when the inguinal cover section is provided on the front exterior body 12F (not shown), the same elasticity as that of the lower waist section is provided. A member can be provided, and the elongation rate in the width direction WD can be set to 150 to 300%, particularly 180 to 260%.

When the elastic members 16 and 19 are provided in the front-rear direction range including the absorbent body 56, as in the lower waist portion U in the illustrated example, in order to prevent the absorbent body 56 from shrinking in the width direction WD in part or all of the elastic members 16 and 19. In this case, the widthwise intermediate portion (preferably including the entire inner and outer joint portions 201 and 202) including a part or all of the portion overlapping with the absorber 56 in the width direction WD is defined as a non-stretchable area A1, and both sides of the widthwise side are stretchable. It is preferable that the area is A2. It is preferable that the waist part W has an elastic region A2 across the entire width direction WD, but similarly to the lower waist part U, a non-elastic region A1 may be provided in the middle in the width direction. Of the stretchable region A2, a portion located in the front-rear direction LD range having the side seal portion 12A becomes a waist lower stretchable region A3.

Such stretchable region A2 and non-stretchable region A1 supply the elastic members 16 to 19 between the inner sheet layer 12H and the outer sheet layer 12S, and provide the elastic members 16 and 19 only in the portion located in stretchable region A2. After fixing with hot melt adhesive, the elastic members 16, 19 are cut by pressure and heating at one point in the middle in the width direction in the region having the absorber 56, or almost the entirety of the elastic members 16, 19 is cut. It can be constructed by cutting into pieces by applying pressure and heating, and removing the elasticity in the non-stretchable area A1 while leaving the elasticity in the elastic area A2.

The sheet material forming the inner sheet layer 12H and the outer sheet layer 12S can be used without particular limitation, but nonwoven fabric is preferred. When using a nonwoven fabric, it is preferable that the basis weight per sheet is about 10 to 30 g/m ² .

The elastic members 16 to 19 are fixed to the exterior bodies 12F and 12B with hot melt adhesive HM using various coating methods. It is preferable that the inner sheet layer 12H and the outer sheet layer 12S are joined with a hot melt adhesive HM for fixing the elastic members 16 to 19 at the portions having the elastic members 16 to 19, respectively. In the portions that do not have the adhesive, they may be bonded using a hot melt adhesive HM, or may be bonded by material welding such as heat sealing or ultrasonic sealing, or some or all of them may not be bonded. In the parts of the exterior bodies 12F and 12B in the illustrated example that have the elastic members 16 to 19, the hot melt adhesive HM is applied only to the outer circumferential surfaces of the elastic members 16 to 19 using a coating means such as a comb gun or a SureWrap nozzle. By sandwiching the elastic members 16 to 19 between the sheets, the hot melt adhesive HM applied to the outer circumferential surfaces of the elastic members 16 to 19 alone is used to fix the elastic members 16 to 19 to both sheet layers and to fix the bond between the two sheet layers. The elastic members 16 to 19 may be fixed to both sheet layers only at both ends in the stretching direction in the stretchable region A2.

(Internal and external joints)
The interior body 200 can be fixed to the exterior bodies 12F, 12B by joining means such as heat sealing or ultrasonic sealing by material welding, or by hot melt adhesive. In the illustrated example, the hot melt adhesive applied to the back surface of the interior body 200, that is, the back surface of the liquid-impermeable sheet 11 in this case, and the base portion 65 of the rising gathers 60 is applied to the inner surfaces of the exterior bodies 12F and 12B. Fixed. The inner and outer joints 201 and 202 that fix the interior body 200 and the exterior bodies 12F and 12B can be provided in almost the entire area where they overlap, for example, at both widthwise ends of the interior body 200, as shown in FIG. It can also be provided in a part other than the part.

(Nonwoven fabric)
As the nonwoven fabric in the above description, any known nonwoven fabric can be used as appropriate depending on the site and purpose. The constituent fibers of the nonwoven fabric include, for example, olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based fibers, and polyamide-based fibers (including single-component fibers as well as composite fibers such as core-sheath fibers), as well as recycled fibers such as rayon and cupro. Fibers, natural fibers such as cotton, etc. can be selected without particular limitation, and a mixture of these can also be used. In order to increase the flexibility of the nonwoven fabric, it is preferable that the constituent fibers be crimped fibers. In addition, even if the constituent fibers of the nonwoven fabric are hydrophilic fibers (including fibers made hydrophilic by a hydrophilizing agent), hydrophobic fibers or water-repellent fibers (including fibers made water-repellent by a water-repellent agent) ). In addition, nonwoven fabrics generally vary depending on the fiber length, sheet forming method, fiber binding method, and laminated structure. It is classified into nonwoven fabrics, point bonded nonwoven fabrics, laminated nonwoven fabrics (SMS nonwoven fabrics with a meltblown layer sandwiched between spunbond layers, SMMS nonwoven fabrics, etc.), and any of these nonwoven 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.

・"Anteroposterior direction" means the direction indicated by the symbol LD in the figure (vertical direction), and "width direction" means the direction indicated by WD in the figure (horizontal direction), and the longitudinal direction and the width direction are orthogonal.

・"Front side" means the side closest to the wearer's skin when wearing a pants-type disposable diaper, and "backside" means the side far from the wearer's skin when wearing a pants-type disposable diaper. .

・"Front side" means the side of the component that is closest to the wearer's skin when wearing a pants-type disposable diaper, and "back side" means the side 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 extension ratio of 200% is synonymous with an extension 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 exchange water: 97.09 wt%) Add 1.0 g of superabsorbent polymer to 49.0 g of the mixture) and stir with a stirrer. The generated gel was left in a constant temperature and humidity chamber at 40° C. x 60% RH for 3 hours, then returned to room temperature, and the gel strength was measured using a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).

・“Basic weight” is measured as follows. After pre-drying the sample or test piece, it is left in a test room or apparatus under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%) to reach a constant weight. Pre-drying refers to making the sample or test piece constant weight in an environment at a temperature of 100°C. Note that fibers with an official moisture content of 0.0% do not need to be pre-dried. From the test piece that has reached a constant weight, use a sample sampling template (100 mm x 100 mm) to cut out a sample with dimensions of 100 mm x 100 mm. Measure the weight of the sample, multiply by 100 to calculate the weight per square meter, and use it as the basis weight.

- "Thickness" is automatically measured using an automatic thickness measuring device (KES-G5 Handy Compression Measurement Program) under the conditions of load: 0.098 N/cm ² and pressurized area: 2 cm ² .

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

・Water absorption rate is the "time to end point" when JIS K7224-1996 "Water absorption rate test method for super absorbent resin" is performed using 2 g of super absorbent polymer and 50 g of physiological saline. .

- "Unfolded state" means a state in which it is flattened without shrinkage or slack.

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

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

The present invention can be used in general disposable wearing articles such as pants-type disposable diapers as described above, tape-type disposable diapers, pad-type disposable diapers, and sanitary napkins.

DESCRIPTION OF SYMBOLS 11...Liquid-impermeable 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 nonwoven fabric, 15, 19... Waist lower elastic member, 17... Waist elastic member, 200... Interior body, 201, 202... Inner/outer joint portion, 30... Top sheet, 40... Intermediate sheet, 50... Absorption element, 56... Absorbent body, 58... Packaging sheet, 60... Rising gathers, 60A... Tip side portion, 60B... Root side portion, 62... Gather sheet, 63... Gathered elastic member, 67... Lodging portion, 68... Rising portion, 70... Side flaps, 71 to 74... sheet layer, 71... most front sheet layer, 72... second sheet layer, 73... third sheet layer, 74... backmost sheet layer, 75... side elastic member, 76... Internal sheet layer, 77... Non-joint part, 79... Dedicated sheet material, 601... First second layer portion, 602... Second second layer portion, A1... Non-stretchable area, A2... Elastic area, A3... Lower waist elastic area, F...front body area, B...back body area, L...middle area, LD...front and back direction, SG...side elastic area, T...waist circumference area, U...lower waist area, W...waist area, WD...width direction, WO... Waist opening, LO...Leg opening, P1...First part, P2...Second part, P3...Third part, HM...Hot melt adhesive, H1...Front side hollow part, H2...Back side hollow part, H3...Tip hollow part .

Claims (7)

Has side flaps without absorbent material on both sides of the crotch area,
The side flap is a part having an elongated side elastic member along the front-rear direction, and a first part located on the absorber side, and a part having an elongate side elastic member along the front-rear direction. , and a second portion located laterally than the first portion,
In the first part, a plurality of sheet layers are laminated, the side elastic member is fixed to the outermost sheet layer, and a front side hollow part is not provided on the front side of the side elastic member. ,
In the second portion, three or more sheet layers are laminated, and an inner sheet layer is interposed between the side elastic member and the outermost sheet layer. A front hollow part that continues in the front-rear direction is provided between the sheet layer and the
A disposable wearing article, wherein a portion of the side flap including the first portion and the second portion contracts in the front-rear direction due to contraction of the side elastic member, thereby forming a side gather that can be elastically expanded in the front-rear direction. And,
The side flap has double folded sheet material folded back at the side edge of the side flap,
The frontmost sheet layer and the backmost sheet layer in the side flap are the front sheet layer and the back sheet layer, respectively, with the folding position of the folded sheet material located outside as the boundary,
The side elastic member of the first portion is arranged between a sheet layer on the front side with the folding position of the folded sheet material located on the outside as a boundary and a sheet layer on the front side with the folding position of the folded sheet material located on the inside as the boundary. It is fixed to
The side elastic member of the second portion is fixed between the front sheet layer and the back sheet layer with the folding position of the folded sheet material located inside as a boundary,
In the second portion, the sheet layer on the front side with the folding position of the folded sheet material located on the outside as a boundary and the sheet layer on the front side with the folding position of the folded sheet material located on the inside as the boundary are not joined. , a front hollow portion is formed on the front side of the side elastic member in the second portion;
A disposable wearing article characterized by: In the first part and the second part, an inner sheet layer is interposed between the side elastic member and the backmost sheet layer, and an inner sheet layer is interposed between the inner sheet layer and the backmost sheet layer. A hollow part is provided on the back side.
The disposable wearing article according to claim 1. The side flap has a third portion between the side edge and the second portion, in which a plurality of sheet layers are laminated,
The third portion does not have the side elastic member and has a hollow tip.
The disposable wearing article according to claim 1 or 2. A plurality of the side elastic members are provided at intervals of 5 to 10 mm in the width direction,
The first portion and the second portion are contracted by the side elastic members and can be expanded in the front-rear direction to an elongation rate of 150 to 300%,
The widthwise dimension of the third portion is 0.08 to 0.3 times the widthwise dimension of the side flap.
The disposable wearing article according to claim 3 . The sheet layer on the back side with respect to the folding position of the folded sheet material located inside is not joined to the sheet layer on the back side with the folding position of the folded sheet material located on the outside as a boundary, so that the first portion and a back side hollow part is formed on the back side of the side elastic member in the second part.
The disposable wearing article according to claim 1 . The folding position of the folded sheet material located inside is further away from the folding position of the folded sheet material located outside to the center side in the width direction,
The front sheet layer and the back sheet layer are not joined to each other at the folding position of the external folding sheet material on the side of the folding position of the folding sheet material located inside, so that the tip hollow part is formed. is formed,
The disposable wearing article according to claim 1 or 5 . an exterior body that constitutes at least the waist circumference of the front body and the back body; an interior body that is attached to the exterior body so as to span from the front body to the back body and that contains an absorbent body; a waist opening; and a pair of left and right A pants-type disposable wearing article comprising leg openings,
The inner body has the side flaps on both sides,
The disposable wearing article according to any one of claims 1 to 6 .

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