JP2020137688A5 - - Google Patents

Description

The present invention relates to an absorbent article for reducing stuffiness.

Many absorbent articles such as disposable diapers and menstrual napkins have a liquid-impermeable sheet on the back side of the absorbent body, and therefore are not highly breathable in the thickness direction. For this reason, stuffiness on the inside (body surface side) of the absorbent article has been regarded as a problem (see, for example, Patent Documents 1 and 2).

While the stuffiness in the absorbent article is improved by improving the breathability of the material, other means may be adopted, for example, if the cause of the stuffiness is sweat, the stuffiness may be improved by sweat absorption (for example). See Patent Documents 1 and 2).

However, the stuffiness caused by the humidity in the air that comes into contact with the body surface before sweating cannot be improved by sweat absorption.

Japanese Unexamined Patent Publication No. 2009-08482 Japanese Unexamined Patent Publication No. 2009-056142

Therefore, the main object of the present invention is to reduce stuffiness during mounting of the absorbent article.

The absorbent articles that have solved the above problems are as follows.
<First aspect>
It has an absorber extending from the front side of the center in the front-rear direction to the rear side of the center in the front-rear direction, a liquid-permeable top sheet covering the front side of the absorber, and a liquid-impermeable sheet covering the back side of the absorber. ,
It has a first portion located anterior to the front end of the absorber and a second portion located posterior to the rear end of the absorber.
The first and second parts have no absorber and
A plurality of sheet layers having the liquid impermeable sheet and having air permeability on the front side thereof are laminated on at least one of the first portion and the second portion, or the liquid impermeable sheet is laminated. A plurality of sheet layers having no sheet and having breathability are laminated, and an elastic member is provided between the plurality of sheet layers.
It has a body gather portion that is contracted in the width direction due to the contraction of the elastic member and is expandable in the width direction.
In absorbent articles
The plurality of sheet layers in the body gather portion have an exposed surface exposed to the outside of the product and a non-exposed surface not exposed to the outside of the product, and an aggregate of fine fibrous cellulose adheres only to the non-exposed surface. Has a moisture-absorbing part,
An absorbent article characterized by that.

(Action effect)
A general absorbent article often has a body gather portion in a first portion located anterior to the front end of the absorber and a second portion located posterior to the rear end of the absorber. Here, the absorber generally has hygroscopicity, and particularly when a highly absorbent polymer is contained, the highly absorbent polymer has high hygroscopicity. Therefore, although it is possible to reduce stuffiness by the hygroscopic action of the absorber in the portion having the absorber, the hygroscopic action of the absorber directly acts on the first part and the second part having no absorber. There is no such thing. Nevertheless, the body gathered part has high adhesion to the body surface, so that it is easy to get stuffy.

Therefore, in this absorbent article, a moisture absorbing portion to which an aggregate of fine fibrous cellulose is attached is provided on a plurality of sheet layers in the body gather portion. The aggregate of fine fibrous cellulose can be obtained by applying a dispersion liquid of fine fibrous cellulose to a sheet layer and then drying it. Since it is porous and highly hydrophilic, it has high hygroscopicity. .. Therefore, by adhering an aggregate of fine fibrous cellulose to the body gather portion as in the present absorbent article, it is possible to reduce the stuffiness of the body gather portion, which has not been prevented from stuffiness in the past.

Further, since the aggregate of the fine fibrous cellulose is hard, if it is simply provided at an arbitrary portion, the wearing feeling may be deteriorated. However, in the present absorbent article, since the aggregate of the fine fibrous cellulose is provided only on the unexposed surface of the plurality of sheet layers in the body gather portion, it does not come into direct contact with the skin. Not only that, the sheet layer of the body gathered part is thicker and thicker in both the natural length state and the mounted state than the non-gathered part sheet layer due to the compression of the material due to the shrinkage in the width direction and the folds formed accordingly. Rigidity (that is, cushioning) increases. Therefore, this increase in thickness and rigidity conceals the hardness of the aggregate of fine fibrous cellulose. Therefore, in the present absorbent article, it is possible to obtain a high hygroscopic effect by the aggregate of the fine fibrous cellulose and reduce the hardness to the touch by the aggregate of the fine fibrous cellulose.

<Second aspect>
The moisture-absorbing portion is provided with an attachment portion of the aggregate of the fine fibrous cellulose in a vertical striped pattern continuous in the front-rear direction and intermittent in the width direction.
The absorbent article of the first aspect.

(Action effect)
The aggregate of fine fibrous cellulose is preferably attached to a wide area in consideration of hygroscopic performance. However, since the aggregate of fine fibrous cellulose is hard, if it is continuous in the expansion / contraction direction, the elasticity of the body gather portion may decrease. Therefore, it is preferable that the absorbent articles are provided in a vertical stripe shape because the fit of the body gather portion is unlikely to deteriorate.

<Third aspect>
The moisture absorbing portion is provided only on at least one facing surface of the adjacent sheet layers sandwiching the elastic member, and the microfibers are not bonded at the portion overlapping the adhering portion of the aggregate of the microfibrous cellulose. It is bonded with a hot melt adhesive except for the part that overlaps with the adhesion part of the aggregate of cellulose.
The absorbent article of the second aspect.

(Action effect)
When adjacent sheet layers are bonded by a hot melt adhesive with an elastic member in between, a dispersion of fine fibrous cellulose is applied to form a hygroscopic portion on the facing surface of the adjacent sheet layers. Adhesion may be hindered depending on the positional relationship between the hot melt adhesive and the hot melt adhesive. On the other hand, in the present absorbent article, since the adjacent sheet layers are bonded by the hot melt adhesive except for the portion overlapping with the adhesion portion of the aggregate of fine fibrous cellulose, the adjacent sheet layers are bonded. It will be done surely. Further, in the body gather portion of the hygroscopic article, the joints of the adjacent sheet layers are intermittent at least in the width direction. Each of the located portions contracts and swells in opposite directions to form a ventilation path composed of a pair of folds, and a moisture absorbing portion is formed only on the inner surface of the ventilation path. Therefore, the air permeability of the body gather portion is enhanced, and the contact efficiency with the moisture in the air is improved, so that the hygroscopicity of the moisture absorbing portion is improved.

<Fourth aspect>
It has a crotch part including the center in the anteroposterior direction, a front body extending forward from the center in the anteroposterior direction, and a posterior body extending posteriorly from the center in the anteroposterior direction.
The back body has side flaps that extend laterally to the absorber.
It has a connecting tape attached to the side flap of the rear body and detachably connected to the front body.
At least the second part of the back body has the top sheet and the liquid impermeable sheet.
A stretchable sheet that elastically expands and contracts in the width direction is provided between the top sheet and the liquid-impermeable sheet in the second portion.
The elastic sheet has the elastic member and the sheet layer adjacent to the front side and the back side of the elastic member, respectively.
The second portion has a body gather portion that is contracted in the width direction due to the contraction of the elastic sheet and is expandable in the width direction.
Tape type disposable diaper,
The moisture absorbing portion is provided on the elastic sheet.
An absorbent article according to any one of the first to third aspects.

(Action effect)
In a tape-type disposable diaper, it is known that a stretchable sheet is attached between a top sheet and a liquid-impermeable sheet in the second portion to provide a body gather portion. Therefore, it is preferable to provide the moisture absorbing portion on the elastic sheet because the moisture absorbing portion can be efficiently provided at a suitable place.

<Fifth aspect>
An exterior body that constitutes at least the waist circumference of the front body and the back body, an interior body including the absorber attached to the exterior body so as to extend from the front body to the back body, a waist opening, and a pair of left and right sides. Pants-type disposable diaper with leg openings,
The exterior body has the first portion and the second portion, and the exterior body has the first portion and the second portion.
Three or more sheet layers that do not have the liquid-impermeable sheet and have breathability are laminated on the first portion and the second portion, and the outermost sheet layer and the intermediate sheet layer are laminated. An elastic member is provided between the two,
In the region having three or more of the sheet layers, the moisture absorbing portion is provided only on the outer surface of the intermediate sheet layer.
An absorbent article according to any one of the first to third aspects.

(Action effect)
The body gathers provided on the first and second parts of the pants-type disposable diaper are generally formed on the exterior body. When the body gather portion is provided on the exterior body, two sheet layers are sufficient, but in order to prevent the front end and the rear end of the interior body from directly contacting the skin, the innermost surface side of the exterior body is used. A sheet layer is added, and the sheet layer covers the front end portion and the rear end portion of the interior body. That is, the outer body of the pants-type disposable diaper has a region having three or more sheet layers. Therefore, by utilizing this and providing the moisture absorbing portion only on the outer surface of the intermediate sheet layer in the region having three or more sheet layers, the thickness of one or more layers inside (skin side) and outside of the moisture absorbing portion is secured. This is preferable because it makes it easier to conceal the hardness of the moisture absorbing portion.

<Sixth aspect>
The sheet layer having the moisture absorbing portion is a non-woven fabric having a fineness of 1.6 to 6.0 dtex, a basis weight of 10 to 30 g / m ² , and a thickness of 0.1 to 1.3 mm.
The amount of the fine fibrous cellulose adhered to the moisture absorbing portion is 5 to 10 g / m ² .
An absorbent article according to any one of the first to fifth aspects.

(Action effect)
The basis weight of the fine fibrous cellulose in the moisture absorbing portion can be appropriately determined, but the amount of the fine fibrous cellulose adhered in the hygroscopic portion is preferably within this range in consideration of hygroscopicity and flexibility.

According to the present invention, there are advantages such as reduction of stuffiness during mounting of the absorbent article.

It is a top view which shows the inner surface of the pants type disposable diaper in the unfolded state. It is a top view which shows the outer surface of the pants type disposable diaper in the unfolded state. It is a 2-2 sectional view of FIG. FIG. 3 is a sectional view taken along the line 3-3 of FIG. (A) is a 4-4 cross-sectional view of FIG. 1, and (b) is a 5-5 cross-sectional view of FIG. It is a perspective view of a pants type disposable diaper. It is a top view which shows the outer surface of the pants type disposable diaper in the unfolded state. (A) is a 4-4 cross-sectional view of FIG. 7, and (b) is a 5-5 cross-sectional view of FIG. 7. It is a top view which shows the inner surface of the tape type disposable diaper in the unfolded state. It is a top view which shows the outer surface of the tape type disposable diaper in the unfolded state. 6-6 is a sectional view taken along the line 6-6 of FIG. 9 is a cross-sectional view taken along the line 7-7 of FIG. (A) 8-8 cross-sectional view of FIG. 9, (b) 9-9 cross-sectional view of FIG. 9, and (c) 10-10 cross-sectional view of FIG. (A) is a plan view of the telescopic sheet, and (b) (c) is a cross-sectional view of the telescopic sheet. It is a top view which shows various patterns of the adhesion part of the aggregate of microfibrous cellulose in a moisture absorption part. 5-5 is a cross-sectional view taken along the line 5-5 of FIG. 1, showing another example. 5-5 is a cross-sectional view taken along the line 5-5 of FIG. 7 showing another example. 8-8 is a cross-sectional view taken along the line 8-8 showing another example. It is sectional drawing which shows the main part of the gather part enlarged and roughly. It is sectional drawing which shows the main part of the gather part enlarged and roughly.

Hereinafter, examples of disposable wear items 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 each component 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 a pattern coat. The fixed part of the elastic member is formed by (transfer of hot melt adhesive by the letterpress method), etc., 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. be. 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 welding a material such as a heat seal or an ultrasonic seal can also be used.

Further, as the nonwoven fabric in the following description, a known nonwoven 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 those made hydrophilic by a hydrophilic agent), hydrophobic fibers or water-repellent fibers (water-repellent fibers made water-repellent by a water-repellent agent) are used. Including). 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 length of the fiber, the sheet forming method, the fiber bonding method, and the laminated structure. Non-woven fabric, point-bonded non-woven fabric, laminated non-woven fabric (SSS non-woven fabric in which the same or similar non-woven fabric layer is laminated, SMS non-woven fabric in which different non-woven fabric layers are laminated, and a melt blown layer sandwiched between spunbond layers, SMMS non-woven fabric, etc.), etc. Any of these non-woven fabrics can be used.

<Example of pants-type disposable diapers>
1 to 6 show pants-type disposable diapers. This pants type disposable diaper extends from the front exterior body 12F constituting the front body F, the rear exterior body 12B constituting the rear body B, and the rear exterior body 12B from the front exterior body 12F through the crotch portion. The interior body 200 provided inside the exterior bodies 12F and 12B is provided, and 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. As a result, the opening formed by the front and rear ends of the exterior bodies 12F and 12B becomes the waist opening WO through which the wearer's body passes, and the lower edges of the exterior bodies 12F and 12B and the interior body 200 on both sides in the width direction of the interior body 200. The portions surrounded by the side edges form the leg opening LO through which the legs pass. The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior bodies 12F and 12B are parts for supporting the interior body 200 with respect to the wearer's body. Further, the reference numeral Y indicates the total length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the rear body B), and the reference numeral X indicates the diaper in the unfolded state. Shows the full width of.

Further, the pants-type disposable diaper of this example forms 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 leg opening LO. It has an intermediate region L defined as a front-rear direction range of the portion (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 rear body B). The waist circumference region T can be divided into a waist portion W conceptually forming an edge portion of the waist opening and a waist lower portion U which is a portion below the waist portion W. Normally, when there is a boundary in the waist circumference region T where the stretching 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 portion W is located on the waist opening WO side of the absorber 56 or the interior body 200. These lengths in the front-rear direction vary depending on the size of the product and can be appropriately determined. For example, the waist portion W may be 15 to 40 mm and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are constricted in a U-shape or a curved shape along the circumference of the wearer's leg, and this is a portion for inserting the wearer's leg. As a result, the pants-type disposable diaper in the unfolded state has a substantially hourglass shape as a whole.

(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 and 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. The internal / external joints 201 for fixing the interior body 200 and the exterior bodies 12F and 12B can be provided in almost the entire region where the interior bodies 200 overlap, and may be provided, for example, in a portion of the interior body 200 excluding both ends in the width direction. can.

(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.

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.

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

(Intermediate sheet)
In order to quickly transfer the liquid that has permeated the top sheet 30 to the absorber, an intermediate sheet (also referred to as a "second sheet") 40 having a faster liquid permeation speed than the top sheet 30 can be provided. The intermediate sheet 40 not only rapidly transfers the liquid to the absorber to improve the absorption performance by the absorber, but also prevents the phenomenon of "return" of the absorbed liquid from the absorber and constantly dries the top sheet 30. It can be in the state of being. The intermediate sheet 40 may be omitted.

As the intermediate sheet 40, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like can be used. In particular, the air-through non-woven fabric is preferable because it is bulky. It is preferable to use a composite fiber having a core-sheath structure for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. The basis weight is preferably 20 to 80 g / m ² , more preferably 25 to 60 g / m ² . The thickness of the raw material fiber of the non-woven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use eccentric fibers having no core in the center, hollow fibers, and eccentric and hollow fibers as mixed fibers of all or a part of the raw material fibers.

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

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

(Liquid impermeable sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited, but is, for example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of the nonwoven fabric, or a plastic film. An example is a laminated sheet in which a non-woven fabric or the like is laminated and bonded to the above. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impermeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching it in a uniaxial or biaxial direction. Is widely used. In addition to this, by applying heat or pressure to reduce the voids of the fibers to strengthen the leakage resistance, and applying a highly water-absorbent resin or hydrophobic resin or a water-repellent agent, without using a plastic film. A liquid-impermeable non-woven fabric can also be used as the liquid-impermeable sheet 11.

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

(Get up gather)
The rising gathers 60 extend along both sides of the interior body 200 over the entire front-rear direction LD, and are provided in contact with the wearer's legs to prevent lateral leakage, and are generally provided as three-dimensional gathers. This includes what is called.

The rising gathers 60 shown in FIGS. 3 and 4 stand up from the side of the interior body 200 to the front side. In this rising gather 60, the portion on the base side stands up diagonally toward the center side in the width direction, and the portion on the tip side from the middle portion stands up diagonally toward the outside in the width direction, but the present invention is limited to this. It is not a thing, and it is possible to make appropriate changes such as a structure that stands on the center side in the width direction as a whole.

More specifically, the rising gather 60 of the first structure consists of two strip-shaped gathered nonwoven fabrics 62 having a length equal to the length in the front-rear direction of the interior body 200, folded back in the width direction WD at the tip portion. A plurality of elongated gather elastic members 63 are fixed in a stretched state along the longitudinal direction between the folded portion and the sheets in the vicinity thereof at intervals in the width direction WD. The base end portion (the end portion opposite to the sheet folded portion in the width direction WD) located on the side opposite to the tip portion of the rising gather 60 is fixed to the side portion on the back side of the liquid permeable sheet 11 in the interior body 200. The root portion 65 is formed, and the portion other than the root portion 65 is the main body portion 66 (the portion on the folded-back portion side) extending from the root portion 65. Further, the main body portion 66 is composed of a root side portion facing the center side in the width direction and a tip side portion folded outward in the width direction from the tip of the root side portion. This example is a surface contact type rising gather 60, but a line contact type rising gather 60 that is not folded outward in the width direction can also be adopted. The both ends of the main body portion 66 in the front-rear direction are in an inverted state and are fixed to the side surface of the top sheet 30, while the intermediate portion in the front-rear direction located between them is not fixed. A gather elastic member 63 along the front-rear direction LD is fixed to the free portion 68 in an extended state.

As the gathered nonwoven fabric 62, a nonwoven fabric to which water repellent treatment is applied with silicone or the like can be preferably used, and the fiber basis weight 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 yarn rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixing is preferably 150 to 350%, more preferably 200 to 300%. Further, as shown in the drawing, the waterproof film 64 can be interposed between the gathered nonwoven fabric 62 folded in two, and in this case, the gathered nonwoven fabric 62 is partially omitted in the existing portion of the waterproof film 64. You can also.

The number of gather elastic members 63 provided in the free portion of the rising gather 60 is preferably 2 to 6, and more preferably 3 to 5. The arrangement interval 60d is preferably 3 to 10 mm. With this configuration, it becomes easier to hit the skin on the surface within the range in which the gather elastic member 63 is arranged. The gather elastic member 63 may be arranged not only on the tip side but also on the base side.

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

Further, for fixing the waterproof film 64 incorporated in the rising gather 60 and the gathered nonwoven fabric 62, and fixing the inverted portion 67 to the side surface of the interior body 200, hot melt adhesives and heat seals by various coating methods can be used. At least one of means by welding a material such as an ultrasonic seal can be used. In the illustrated example, slot application of hot melt adhesive is used to fix the waterproof film 64. Further, although the means for fixing the inverted portion 67 in the illustrated example is a combination of hot melt adhesive and material welding, these fixing can also be performed by only one of the means.

The object to be fixed to the root portion 65 of the rising gather 60 can be an appropriate member such as the top sheet 30, the liquid impermeable sheet 11, and the absorbing element 50 in the interior body 200.

In the rising gather 60 configured as described above, both ends of the main body portion 66 in the front-rear direction are fixed so as not to stand up, whereas there is a non-fixed free portion 68 between them. Only the free portion 68 stands up so as to abut on the body side as shown in FIG. 3 due to the contraction force of the gather elastic member 63. In particular, when the root portion 65 is located on the back side of the interior body 200, the rising gathers 60 stand up so as to open outward in the width direction in the crotch portion and its vicinity, so that the rising gathers 60 abut on the surface around the legs. And the fit will be improved.

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

(Absorber)
The absorber 56 can be formed by an aggregate of fibers. The fiber aggregate is a filament aggregate obtained by stacking short fibers such as cotton-like pulp and synthetic fibers, and opening tow (fiber bundle) of synthetic fibers such as cellulose acetate as needed. Can also be used. The fiber basis weight may be, for example, about 100 to 300 g / m ² in the case of stacking cotton-like pulp or staple fibers, and about 30 to 120 g / m ² in the case of filament aggregates. Can be done.

The absorber 56 may have a rectangular shape, but as shown in FIG. 1, it has a front end portion, a rear end portion, and a constricted portion 56N located between them and narrower than the front end portion and the rear end portion. The hourglass shape is preferable because the fit of the absorber 56 itself and the rising gather 60 around the legs is improved.

(Highly absorbent polymer particles)
The absorber 56 may contain high-absorbent polymer particles in part or all of the absorber 56. The highly absorbent polymer particles include "powder" as well as "particles". As the highly absorbent polymer particles, those used for this type of disposable diaper can be used as they are.

(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 .

(Exterior body)
The exterior bodies 12F and 12B are composed of a front exterior body 12F which is a part constituting the front body F and a rear exterior body 12B which is a part constituting the rear body B, and the front exterior body 12F and the rear exterior body 12B. Is not continuous on the crotch side and is separated in the front-back direction LD (exterior two-piece type). The separation distance 12d can be, for example, about 150 to 250 mm. Further, as shown in FIGS. 7 and 8, the exterior body 12 can be integrated from the front body F to the rear body B through the crotch and continuously (exterior body integrated type).

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 does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a buttock cover portion C extending from the waist circumference region T to the intermediate region L side. are doing. 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, or the front exterior body 12F and the front exterior body 12F may be provided with an inguinal cover portion but no buttock cover portion. It is not necessary to provide a portion corresponding to the intermediate region L on both of the rear exterior bodies 12B. Further, in the illustrated example, the lower edge of the buttock cover portion C is formed in a straight line along the WD in the width direction like the lower edge of the front exterior body 12F, but is located on the waist opening side toward the outside in the width direction. It can also be a curve that makes it possible.

In the exterior bodies 12F and 12B, as shown in FIGS. 4 and 5, the outer sheet layer 12S and the inner sheet layer 12H are joined by a joining means such as a hot melt adhesive or welding. The sheet material forming the outer sheet layer 12S and the sheet material forming the inner sheet layer 12H are a common sheet material as shown in the example shown in FIG. 5, and are individually used as shown in the example shown in FIG. It can also be used as a sheet material. That is, in the former case, the inner sheet layer 12H and the outer sheet layer 12S are formed by the inner portion and the outer portion of one sheet material folded back at the edge of the waist opening WO (which may be the edge on the crotch side), respectively. Will be done. The former example has the advantage that the amount of material used for the sheet layer is small, and the latter example has the advantage that the positions are less likely to shift when the inner sheet layer 12H and the outer sheet layer 12S are bonded together. Further, in the example shown in FIG. 8, the sheet material forming the inner sheet layer 12H extends only to the edge of the waist opening WO, but the sheet material forming the outer sheet layer 12S is the inner sheet layer 12H. The folded sheet layer 12r wraps around the edge of the waist opening WO of the sheet material and is folded inward, and the folded sheet layer 12r extends over the end portion of the interior body 200 on the waist opening side. Although not shown, a separate sheet layer may be added further inside the inner sheet layer 12H in order to cover the end portion of the interior body 200 on the waist opening side without providing the folded sheet layer 12r.

The sheet material used for the outer sheet layer 12S and the inner sheet layer 12H can be used without particular limitation, but a non-woven fabric is preferable, and in particular, a fineness of 1.6 to 6.0 dtex, a basis weight of 10 to 30 g / m ² , and a thickness of 0.1 to It is preferable to use a 1.3 mm non-woven fabric.

(Expandable area / non-expandable area)
The exterior bodies 12F and 12B are provided with elongated elastic members 15 to 18 such as rubber threads between the outer sheet layer 12S and the inner sheet layer 12H in order to improve the fit to the wearer's waist circumference. An elastic region A2 that elastically expands and contracts in the width direction WD with expansion and contraction of 15 to 18 is formed. In this expansion / contraction region A2, in the state of natural length, the outer sheet layer 12S and the inner sheet layer 12H contract with the contraction of the elastic member, and wrinkles or folds are formed, and the elastic members 15 to 18 extend in the longitudinal direction. Then, the outer sheet layer 12S and the inner sheet layer 12H can be stretched to a predetermined stretch rate without wrinkles. That is, the expansion / contraction region A2 is a gather portion that is contracted in the width direction WD due to the contraction of the elastic members 15 to 18 and is expandable in the width direction WD. As the elastic members 15 to 18, synthetic rubber or natural rubber may be used.

For bonding the outer sheet layer 12S and the inner sheet layer 12H on the exterior bodies 12F and 12B, and fixing the elastic members 15 to 18 sandwiched between them, hot melt adhesives, heat seals, and ultrasonic seals are used by various coating methods. At least one of the fixing means by welding the material such as the above can be used. If the entire surface of the exterior bodies 12F and 12B is firmly fixed, the flexibility is impaired. Therefore, it is preferable that the parts other than the adhesive portion of the elastic members 15 to 18 are not adhered or are weakly adhered. In the illustrated example, the hot melt adhesive is applied only to the outer peripheral surfaces of the elastic members 15 to 18 by a coating means such as a comb gun or a sure wrap nozzle, and the elastic members 15 to 18 are sandwiched between the two sheet layers 12S and 12H. The structure is such that the elastic members 15 to 18 are fixed to both sheet layers 12S and 12H and the elastic members 15 to 18 are joined to both sheet layers 12S and 12H only by the hot melt adhesive applied to the outer peripheral surface of the above. In this case, as shown in FIG. 19, in the mounted state, folds PL extending in a direction orthogonal to the expansion / contraction direction are alternately formed inside and outside the gather portion. The folds have a small compressed shape at the fixed positions of the elastic members 15 to 18, and a shape that bulges larger than the fixed positions of the elastic members 15 to 18 between the adjacent elastic members 15 to 18. The elastic members 15 to 18 can be fixed to the outer sheet layer 12S and the inner sheet layer 12H only at both ends in the expansion / contraction direction in the expansion / contraction region A2. In this case, as shown in FIGS. 20 (a) and 20 (b), if the joint between the two sheet layers 12S and 12H has an intermittent pattern at least in the width direction WD, both are in a mounted state in which the gather portion is contracted to some extent. The portions located between the joints of the sheet layers 12S and 12H each contract and swell in opposite directions to form a ventilation path AR composed of a pair of folds PL.

More specifically, between the outer sheet layer 12S and the inner sheet layer 12H in the waist portion W of the exterior bodies 12F and 12B, a plurality of waist portion elastic members 17 are vertically arranged so as to be continuous over the entire width direction WD. They are installed at intervals. Further, among the waist elastic members 17, one or a plurality of the elastic members 17 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. Except for the portion, it may be provided on both sides in the width direction. 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. It is preferable to provide about 3 to 22 thread rubbers (about 0 mm ² ) at intervals of 4 to 12 mm, and the elongation rate of the WD in the width direction of the waist portion W by this is about 150 to 400%, particularly about 220 to 320%. It is preferable to have it. Further, the waist portion W does not need to use the waist portion elastic member 17 having the same thickness for all of the front-rear direction LDs or to have the same elongation rate. The thickness and the elongation rate may be different.

Further, between the outer sheet layer 12S and the inner sheet layer 12H in the waist lower portion U of the exterior bodies 12F and 12B, a plurality of waist lower elastic members 15 and 18 made of elongated elastic members are spaced vertically. It is installed open.

The elastic members 15 and 18 at the lower part of the waist have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, a cross-sectional area of 0.05 to 1.5 mm ² in the case of natural rubber, especially 0.1 to 0.1 to It is preferable to provide about 5 to 30 thread rubbers (about 1.0 mm ² ) at intervals of 1 to 15 mm, particularly 3 to 8 mm, and the elongation rate of the WD in the width direction of the lower waist portion U by this is 200 to 350%. In particular, it is preferably about 240 to 300%.

Further, between the outer sheet layer 12S and the inner sheet layer 12H in the buttock cover portion C of the rear exterior body 12B, a plurality of cover portion elastic members 16 made of elongated elastic members are attached at intervals in the vertical direction. Has been done.

The cover elastic member 16 has 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 1.0 mm. It is preferable to provide about 2 to 10 rubber threads of about ² ) at intervals of 5 to 40 mm, particularly 5 to 20 mm, and the elongation rate of the WD in the width direction of the cover portion by this is 150 to 300%, particularly 180 to 260. % Is preferable.

When the inguinal cover portion is provided on the front exterior body 12F, the cover portion elastic member can be provided in the same manner.

When elastic members 15, 16 and 18 are provided in the anteroposterior direction range having the absorber 56 as in the lower waist portion U and the buttock cover portion C in the illustrated example, the width direction of the absorber 56 in a part or all of them. In order to prevent the contraction of the WD, the middle width direction (preferably including almost the entire inner / outer joint portion 201) including a part or all of the portion overlapping the absorber 56 in the width direction is defined as the non-stretchable region A1. Both sides in the width direction are defined as the expansion / contraction region A2. The waist portion W is preferably the stretchable region A2 over the entire width direction WD, but the non-stretchable region A1 may be provided in the middle in the width direction as in the waist lower portion U.

The stretchable region A2 and the non-stretchable region A1 supply elastic members 15 to 18 between the inner sheet layer 12H and the outer sheet layer 12S, and the elastic members 15, 16 and 18 are at least in the stretchable direction in the stretchable region A2. The elastic members 15, 16 and 18 are fixed at both ends via a hot melt adhesive and are not fixed in the non-stretchable region A1 but in the non-stretchable region A1. By cutting by pressurization and heating, or by cutting almost all of the elastic members 15, 16 and 18 into small pieces by pressurization and heating, the elasticity is killed in the non-stretchable region A1 while leaving the elasticity in the stretchable region A2. Can be built. In the former case, as shown in FIG. 4, the non-stretchable region A1 is in a state where the continuous cutting residue from the elastic members 15, 16 and 18 of the stretchable region A2 is independently contracted to the natural length as the unnecessary elastic member 19. It will remain between the outer sheet layer 12S and the inner sheet layer 12H, and in the latter case, although not shown, the continuous cutting residue from the elastic members 15, 16 and 18 of the elastic region A2, and the elastic member 15 of both elastic regions A2. The cut pieces of the elastic member that are not continuous with, 16 and 18 remain between the outer sheet layer 12S and the inner sheet layer 12H in a state of being independently shrunk to the natural length as the unnecessary elastic member 19.

In the exterior two-piece type pants-type disposable diaper, the interior body 200 is exposed between the front exterior body 12F and the rear exterior body 12B, so that the liquid-impermeable sheet 11 is not exposed on the back surface of the interior body 200. A cover non-woven fabric 20 that covers the back surface of the interior body 200 is provided between the front exterior body 12F and the interior body 200 and between the rear exterior body 12B and the interior body 200.

The range in the front-rear direction of the cover non-woven fabric 20 is not particularly limited as long as it has a portion overlapping the front exterior body 12F and the rear exterior body 12B, and as shown in FIGS. 2 and 5, the interior body 200 is rearward from the front end. The rear exterior body 12B and the interior body 200 may extend from the middle position in the front-rear direction to the region where the front exterior body 12F and the interior body 200 overlap, although they may extend in the front-rear direction LD over the entire area up to the end. It may extend in the anteroposterior LD to the intermediate position in the anterior-posterior direction of the overlapping region.

The width direction range of the cover nonwoven fabric 20 is a range in which the exposed back surface of the liquid impermeable sheet 11 can be hidden. Therefore, in the illustrated example, since the liquid-impermeable sheet 11 is exposed between the base ends of the left and right rising gathers 60, the base end of the other rising gather 60 is exposed from the back side of the base end portion of at least one rising gather 60. The cover nonwoven fabric 20 is provided so as to cover the width direction range up to the back side of the portion. Further, even if both ends in the width direction of the cover nonwoven fabric 20 are raised and do not cover the back side of the base end portion of the gather 60, but the gathered nonwoven fabric 62 covers the back side of both ends in the width direction of the cover nonwoven fabric 20, the cover nonwoven fabric 20 is formed. It is possible to conceal the liquid impermeable sheet 11 with the gathered non-woven fabric 62 and the gathered non-woven fabric 62.

<Example of tape-type disposable diapers>
9 to 14 show an example of a tape-type disposable diaper, in which reference numeral X indicates the entire width of the diaper excluding the connecting tape, and reference numeral Y indicates the total length of the diaper. This tape-type disposable diaper has an absorber 56 extending from the front body F to the back body B, a liquid-permeable top sheet 30 covering the front side of the absorber 56, and a liquid-impermeable top sheet 30 covering the back side of the absorber 56. It has a sheet 11 and has a pair of side flaps SF extending laterally from the side edge of the absorber 56. A constriction along the leg circumference is formed in the middle of the side flap SF in the front-rear direction, and a connecting tape 13 is provided on the rear side of the constricted portion. Further, in this tape type disposable diaper, the first portion 91 which is located in front of the front end of the absorber 56 and does not have the absorber 56, and the first portion 91 which is located behind the rear end of the absorber 56 and has the absorber 56. It has a second portion 92 that it does not have.

The back surface of the liquid impermeable sheet 11 is covered with the exterior nonwoven fabric 21. The basis weight and thickness of the exterior nonwoven fabric 21 can be appropriately determined, but usually, the basis weight is 15 to 30 g / m ² and the thickness is preferably 0.2 to 1.2 mm. The exterior non-woven fabric 21 extends to the peripheral edge of the diaper, the liquid-impermeable sheet 11 extends to the front and rear edges of the diaper in the front-rear direction, and the side edge of the absorber 56 and the side of the exterior non-woven fabric 21 in the width direction. Although it extends to the edge, the exterior nonwoven fabric 21 may be only a part of the anteroposterior LD, only a part of the width WD, or both, if necessary. .. For example, when a part of the liquid impermeable sheet 11 is covered with another material such as a gathered nonwoven fabric, the outer nonwoven fabric 21 may not be provided on the portion.

The top sheet 30 extends from the front end to the rear end of the product in the front-rear direction and extends laterally from the absorber 56 in the width direction WD. For example, the starting point of the rising gather 60 described later is more than the side edge of the absorber 56. If necessary, such as when the top sheet 30 is located on the center side in the width direction, the width of the top sheet 30 can be made shorter than the total width of the absorber 56, and the like can be appropriately deformed.

It is desirable that the liquid impermeable sheet 11 extends in the same or wider range as the absorber 56 in the anteroposterior LD and the width WD, but if other impermeable means are present, if necessary, the liquid impermeable sheet 11 may be extended. It is also possible to have a structure that does not cover the end portion of the absorber 56 in the anteroposterior direction LD and the width direction WD.

Further, as in the case of the pants-type disposable diaper, the absorber 56 can be interposed between the top sheet 30 and the liquid-impermeable sheet 11 as an absorbent element wrapped by the packaging sheet, and is sandwiched between the top sheet and the absorbent element. Can be provided with an intermediate sheet 40. Although the intermediate sheet 40 of the illustrated example is arranged in the center shorter than the width of the absorbing element 50, it may be provided over the entire width. The length in the longitudinal direction of the intermediate sheet 40 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.

In order to prevent excrement that travels laterally along the top sheet 30 and prevent so-called lateral leakage, rising gathers 60 that stand up on the wearer's skin side are provided on both sides of the surface widthwise WD. It is preferable to have. Of course, the rising gather 60 can be omitted.

When the rising gather 60 is adopted, its structure is not particularly limited, and any known structure can be adopted. In the raised gather 60 of the illustrated example, the root portion 65 fixed to the area including the side flap, the main body portion 66 extending from the root portion, and both ends of the main body portion 66 in the front-rear direction are fixed in an inverted state. A gathered nonwoven fabric 62 having a non-fixed raised portion 68 located between the front and rear inverted portions 67 of the portion 67 and the main body portion 66, and a gather elastic member 63 fixed to at least the tip portion of the raised portion 68. It has become. As the gathered nonwoven fabric 62 and the gathered elastic member 63, the same ones as in the case of the pants type disposable diaper can be used. As shown in FIGS. 9 and 11, a plurality of gather elastic members 63 may be provided, or one gather elastic member 63 may be provided.

The inner surface of the gathered nonwoven fabric 62 has a joint starting end in the width direction on the side portion of the top sheet 30, and the portion outside the joining starting end in the width direction is the inner surface of each side flap SF, that is, liquid impermeable in the illustrated example. It is bonded to the side portion of the sheet 11 and the side portion of the exterior nonwoven fabric 21 located outside in the width direction by a hot melt adhesive or the like.

Around the legs, the inside of the rising gather 60 in the width direction from the joint start end is fixed on the top sheet 30 at both ends in the front-rear direction of the product, but the part in between is a non-fixed free part, and this free part is It rises due to the contraction force of the elastic member 63 and comes into close contact with the body surface.

A side elastic member 69 made of an elongated elastic member such as a rubber thread is fixed to each side flap SF in a state of being extended along the front-rear direction LD, whereby the leg peripheral portion of each side flap SF is flat. It is configured as a gather. As shown in the illustrated example, the side elastic member 69 is provided between the gathered nonwoven fabric 62 and the liquid permeable sheet 11 on the outer side in the width direction near the joining start end in the joined portion of the gathered nonwoven fabric 62, and is provided in the side flap SF. It can also be provided between the liquid impermeable sheet 11 and the exterior nonwoven fabric 21. A plurality of side elastic members 69 may be provided on each side as shown in the illustrated example, or only one side elastic member 69 may be provided on each side.

The plane gather is a portion on which the contraction force of the side elastic member 69 acts (a portion in which the side elastic member 69 is shown in the drawing). Therefore, in addition to the structure in which the side elastic member 69 exists only in the flat gathered portion, the side elastic member 69 exists on the front side, the rear side, or both sides of the flat gathered portion, but the side elastic member 69 is present except in the flat gathered portion. When the member is finely cut in one place or many places, or is not fixed to the sheet sandwiching the side elastic member 69, or both of them, the contraction force acts on the parts other than the plane gather. However, it also includes a structure in which the contractile force of the side elastic member 69 acts only on the portion of the plane gather (substantially equivalent to not providing the elastic member).

The connecting tape 13 in the illustrated example is a sheet base material forming a tape mounting portion 13C fixed to the side portion of the diaper, a tape main body portion 13B protruding from the tape mounting portion 13C, and a tape main body portion 13B in the sheet base material. It has a locking portion 13A with respect to the front body F provided in the middle portion in the width direction of the above, and the tip side from the locking portion 13A is a grip portion. The tape mounting portion 13C of the connecting tape 13 is sandwiched between the gathered nonwoven fabric 62 forming the inner layer and the outer nonwoven fabric 21 forming the outer layer in the side flap, and is adhered to both nonwoven fabrics 62 and 12 with a hot melt adhesive. Further, the locking portion 13A is bonded to the inner surface of the tape main body portion 13B with an adhesive.

As the locking portion 13A, a hook material (male material) of a mechanical fastener (hook-and-loop fastener) is suitable. The hook material has a large number of engaging protrusions on its outer surface side. The shapes of the engaging protrusions are (A) checkered, (B) J-shaped, (C) mushroom-shaped, (D) T-shaped, and (E) double J-shaped (J-shaped). There are shapes that are combined together), but any shape may be used. Of course, an adhesive layer can be provided as a locking portion of the connecting tape 13.

Further, as the sheet base material forming the tape mounting portion 13C to the tape main body portion 13B, a non-woven fabric, a plastic film, a polylami non-woven fabric, paper or a composite material thereof can be used.

When wearing the diaper, the connecting tape 13 is locked to an appropriate position on the outer surface of the front body F in a state where the side flap SF of the back body B is overlapped on the outside of the side flap SF of the front body F. The position and size of the locking portion of the connecting tape 13 can be arbitrarily determined.

It is preferable to provide a target sheet 24 having a target for facilitating the locking at the locking portion of the connecting tape 13 on the front body F. When the locking portion 13A is a hook material, the target sheet 24 is a film type having a film layer and an engaging layer provided on the entire outer surface thereof on which the hook of the locking portion 13A is detachably engaged. Can be preferably used. In this case, the engaging layer is a net-like body knitted with threads and having loops mounted on the film layer, and a non-woven fabric layer of thermoplastic resin is a film layer by intermittent ultrasonic sealing. It is known that the non-woven fabric fibers are attached to the top and form a loop, but any of them can be preferably used. It is also possible to use a filmless type target tape which is made by embossing a non-woven fabric of a thermoplastic resin and has no film layer. In these target tapes, the hook of the connecting tape 13 is entangled or caught in the loop to bond the connecting tape 13.

When the locking portion 13A is an adhesive layer, a sheet substrate made of a plastic film having a smooth surface and having a high adhesiveness and having a peeling treatment can be used.

Further, when the locking portion of the connecting tape 13 on the front body F is made of a nonwoven fabric, for example, when the exterior nonwoven fabric 21 is provided as shown in the illustrated example, and the locking portion 13A of the connecting tape 13 is a hook material. The target sheet 24 may be omitted, and the hook material may be entwined with the non-woven fabric of the exterior non-woven fabric 21 to be locked. In this case, the target sheet 24 may be provided between the exterior nonwoven fabric 21 and the liquid impermeable sheet 11.

An elastic sheet 70 elastically expands and contracts in the width direction WD is attached to a region including between the left and right connecting tapes 80 in the rear body B, and the elastic sheet 70 contracts in the width direction WD and also contracts in the width direction WD. It is a gather part that can be extended. The elastic sheet 70 may be located only in the second portion 92, but if it is arranged so as to extend from the second portion 92 to the rear end portion of the absorber 56 as shown in the illustrated example, the elastic sheet 70 may be located only in the second portion 92. It is preferable because the rear end is firmly pressed against the body.

An elastic film may be used for the elastic sheet 70, but it is preferable that the elastic sheet 70 has breathability. In this case, a sheet-like elastic member having breathability such as a stretchable non-woven fabric can be used, but as shown in FIGS. 13 and 14, the support sheet layer 71 such as two non-woven fabrics is made of a hot melt adhesive or the like. An elastic member 72 having a perforated sheet-like, net-like, or elongated shape (thread-like or string-like) between both support sheet layers 71 is fixed in a stretched state along the width direction WD while being bonded with an adhesive. Is preferably used. The material of the support sheet layer 71 in this case is not particularly limited, but is preferably a non-woven fabric having a fineness of 1.6 to 6.0 dtex, a basis weight of 10 to 30 g / m ² , and a thickness of 0.1 to 1.3 mm. .. The elongation rate of the elastic member 72 is preferably about 150 to 250%. Further, when an elongated member 72 having an elongated shape (thread shape, string shape, etc.) is used, it is preferable to provide about 5 to 15 elastic members 72 with a thickness of 420 to 1120 dtex at intervals of 3 to 10 mm.

The width of the telescopic sheet 70 can be appropriately determined, but it is preferable that the width extends between the left and right side flap SFs as shown in the illustrated example. As a specific dimension, the width of the elastic sheet 70 is preferably about 80 to 95% of the total width X of the main body portion excluding the connecting tape 80.

Both ends of the widthwise WD of the telescopic sheet 70 may be non-stretchable regions 76 in order to be held and attached by suction during manufacturing. The dimensions of the non-stretchable region 76 and the dimensions of the intermediate stretchable region 75 located between them and stretchable in the width direction WD can be appropriately determined, but the width of the intermediate stretchable region 75 is the width of the left and right connecting tape 80 described later. The width between the connecting portions 83U and 83L is preferably 45 to 90%, and the width of the non-stretchable region 76 is preferably about 5 to 50 mm in order to prevent shrinkage and curling during manufacturing. The non-stretchable region 76 may be a region having no elastic member 72, but the non-stretchable region 76 is non-stretchable by attaching the elastic member 72 over the intermediate stretchable region 75 and the non-stretchable region 76 and cutting the elastic member 72 in the non-stretchable region 76. The structure may be such that the elastic member 72 remains in the region 76 but hardly expands or contracts at all.

Further, a part of the elastic member 72 may be arranged so as to cross the absorber 56, but as shown in FIG. 7, the elastic member 72 is not provided in a part or all of the portion overlapping with the absorber 56. Alternatively, if the elastic member 72 is cut at a part or the whole of the portion overlapping with the absorber 56 so as to have a structure that hardly expands or contracts at all, the rear end portion of the absorber 56 does not shrink in the width direction, so that the fit is further improved. improves.

In the illustrated example, the elastic sheet 70 is arranged between the liquid impermeable sheet 11 and the absorbing element 50, but the arrangement is not particularly limited. For example, the stretchable sheet 70 may be arranged between the liquid-impermeable sheet 11 and the exterior nonwoven fabric 21, or may be provided outside the exterior nonwoven fabric 21.

<Hygroscopic part>
The pants-type disposable diaper and the tape-type disposable diaper have a first portion 91 located in front of the front end of the absorber 56 and a second portion 92 located behind the rear end of the absorber 56. Further, a plurality of sheet layers 71, 30, 62 having a liquid-impermeable sheet 11 and having air permeability on the front side thereof are laminated on at least one of the first portion 91 and the second portion 92. A plurality of sheet layers 12S, 12H, 12r having no liquid permeable sheet 11 and having air permeability are laminated, and between the sheet layers 71, 12S, 12H adjacent to each other in the thickness direction. Elastic members 15-18, 72 are provided. As a result, at least one or both of the first portion 91 and the second portion 92 is contracted in the width direction WD due to the contraction of the elastic members 15 to 18, 72, and the body is expandable in the width direction WD. It has a gather portion 90.

Therefore, for example, in the case of the above-mentioned pants-type disposable diaper, as shown in FIG. 16, the portions of the gathered portions of the exterior bodies 12F, 12B, and 12 located at the first portion 91 and the second portion 92 are the body gathered portions 90. be. Further, in the case of the above-mentioned tape type disposable diaper, the entire portion of the gather portion formed by the elastic sheet 70 located at the second portion 92 becomes the body gather portion 90.

In such a case, as shown in FIGS. 2, 7, 4, 15 to 18, an aggregate of fine fibrous cellulose is formed only on the unexposed surface of the sheet layers 12S, 12H, 71 in the body gather portion 90. It is preferable to have a moisture absorbing portion 99 to which 98 is attached. For example, in the case of the above-mentioned pants-type disposable diaper having the exterior bodies 12F and 12B having a two-layer structure, the non-exposed surface of the sheet layer in the body gather portion 90 is the inner surface and the inner sheet of the outer sheet layer 12S as shown in FIG. In the case of the above-mentioned pants-type disposable diaper which is the outer surface of the layer 12H and has the exterior body 12 having a three-layer structure, as shown in FIG. 17, the inner surface of the outer sheet layer 12S, the outer surface of the inner sheet layer 12H, and the folded sheet layer. It is the outer surface. Further, in the case of the above-mentioned tape type disposable diaper, both sides of the support sheet layer 71 of the elastic sheet 70, and the inner surface of the portion overlapping the elastic sheet 70 in the top sheet 30 and the gathered nonwoven fabric 62 are not exposed in the body gather portion 90. It is a face. When there are a plurality of non-exposed surfaces of the sheet layer in the body gather portion 90 as in these examples, the moisture absorbing portion 99 may be provided on only one of them, or the moisture absorbing portion 99 may be provided on any plurality of surfaces. May be.

The aggregate 98 of fine fibrous cellulose is porous and highly hydrophilic, and therefore has high hygroscopicity. Therefore, by having the moisture absorbing portion 99 in which the aggregate 98 of the fine fibrous cellulose is attached to the trunk gather portion 90, it is possible to reduce the stuffiness of the trunk gather portion 90 which has not been conventionally prevented from stuffiness. Further, since the aggregate 98 of the fine fibrous cellulose is hard, if it is simply provided at an arbitrary portion, the wearing feeling may be deteriorated. However, if the aggregate 98 of the fine fibrous cellulose is provided only on the non-exposed surface of the sheet layer in the body gather portion 90, it does not come into direct contact with the skin. Not only that, as shown in FIGS. 19 and 20, the sheet layers 12S and 12H of the body gather portion 90 are the seat layers of the non-gather portion due to the compression of the material due to the shrinkage of the WD in the width direction and the fold PL formed accordingly. In comparison, the thickness and rigidity (that is, cushioning property) are increased in both the natural length state and the wearing state. Therefore, the hardness of the aggregate 98 of the fine fibrous cellulose is concealed by this increase in thickness and rigidity. Therefore, the moisture absorbing portion 99 can reduce the hardness to the touch by the aggregate 98 of the fine fibrous cellulose while obtaining a high hygroscopic effect by the aggregate 98 of the fine fibrous cellulose.

The fine fibrous cellulose refers to fine cellulose fibers or bundles thereof taken out from plants such as pulp, and generally refers to fibrous cellulose having an average fiber width of nano size (1 to 1000 nm or less), and has an average fiber width (1 to 1000 nm or less). The median diameter) is preferably 100 nm or less (generally referred to as cellulose nanofibril (CNF)), and particularly preferably 10 to 60 nm. The average fiber width of the fine fibrous cellulose can be measured by the following method. That is, first, 100 ml of an aqueous dispersion of fine fibrous cellulose having a solid content concentration of 0.01 to 0.1% by mass is filtered through a membrane filter made of Teflon (registered trademark), once with 100 ml of ethanol, and with 20 ml of t-butanol. Substitute the solvent three times. Next, it is freeze-dried and coated with osmium to prepare a sample. This sample is observed by an electron microscope SEM image at a magnification of 5000 times, 10000 times or 30000 times (in this example, a magnification of 30000 times) depending on the width of the constituent fibers. Specifically, two diagonal lines are drawn on the observation image, and three straight lines passing through the intersections of the diagonal lines are arbitrarily drawn. Further, a total of 100 fiber rods intersecting with these three straight lines are visually measured. Then, the medium diameter (median diameter) of the measured value is taken as the average fiber width.

The amount of the aggregate 98 of the fine fibrous cellulose attached to the moisture absorbing portion 99 can be appropriately determined, but is preferably about 3 to 10 g / m ² in consideration of hygroscopicity and flexibility, and particularly 5 to 7 g / m. It is more preferable to be about ² .

The aggregate 98 of fine fibrous cellulose is produced by a known method such as forming by applying a fine fibrous cellulose dispersion liquid dispersed in a dispersion liquid such as water to the target surface of a target sheet layer and drying it. can do. When the adhesion portion of the aggregate 98 of the fine fibrous cellulose is formed by applying the fine fibrous cellulose dispersion liquid, if the dispersion liquid easily penetrates into the target sheet layer, the adhesion portion is formed over the coated surface and the inside, and the target is formed. If the dispersion liquid does not permeate or is difficult to permeate into the sheet layer of the above, the adhered portion is formed only on the coated surface. When the dispersion liquid of the fine fibrous cellulose does not permeate or is difficult to permeate into the target sheet layer, the adhered portion of the aggregate 98 of the fine fibrous cellulose continues in a layered manner on the coated portion. On the other hand, in the case of a non-woven fabric in which the target sheet layer has a certain amount of fiber gaps, when the dispersion liquid of fine fibrous cellulose is applied, the adhered portion of the aggregate 98 of fine fibrous cellulose does not continue in a layer shape in some places. The aggregate 98 of the fine fibrous cellulose is missing, and an attached portion is formed in a three-dimensional network. The latter is preferable in terms of excellent flexibility and hygroscopicity.

When the attachment portion of the aggregate 98 of the fine fibrous cellulose is formed by applying the fine fibrous cellulose dispersion, the concentration (mass / volume) of the fine fibrous cellulose dispersion may be 0.1 to 10%. It is preferably 1.0 to 5.0%, more preferably 1.5 to 3.0%, and particularly preferably 1.5 to 3.0%.

The B-type viscosity (60 rpm, 20 ° C.) of the fine fibrous cellulose dispersion is, for example, 700 cps or less, preferably 200 cps or less, and more preferably 50 cps or less. By keeping the B-type viscosity of the fine fibrous cellulose dispersion low in this way, the fine fibrous cellulose can be uniformly applied to the nonwoven fabric.

The fine fibrous cellulose dispersion can be applied by spraying on the target surface or by using a transfer method such as a letterpress method.

Examples of pulp fibers that can be used for producing fine fibrous cellulose include chemical pulps such as broadleaf tree pulp (LBKP) and coniferous tree pulp (NBKP), bleached thermomechanical pulp (BTMP), stone ground pulp (SGP), and pressurized stone ground. Pulp (PGW), Refiner Grand Pulp (RGP), Chemi Grand Pulp (CGP), Thermo Grand Pulp (TGP), Grand Pulp (GP), Thermo Mechanical Pulp (TMP), Chemi Thermo Mechanical Pulp (CTMP), Refiner Mechanical Pulp From machine pulp such as (RMP), brown waste paper, craft envelope blind paper, magazine waste paper, newspaper waste paper, leaflet waste paper, office waste paper, cardboard waste paper, top white waste paper, Kent waste paper, imitation waste paper, ground ticket waste paper, shaving paper waste paper, etc. Examples thereof include used paper pulp produced and deinked pulp (DIP) obtained by deinking waste paper pulp. These may be used alone or in combination of a plurality of types as long as the desired effects are not impaired. Further, the pulp fiber obtained by subjecting it to a chemical treatment such as carboxymethylation may be used.

Examples of the method for producing fine fibrous cellulose include mechanical methods such as a high-pressure homogenizer method, a microfluidizer method, a grinder grinding method, a bead mill freeze-grinding method, and an ultrasonic defibration method, but the method is limited to these methods. It's not a thing. Further, nanofiber formation is promoted by the combined use of TEMPO oxidation treatment, phosphoric acid esterification treatment, acid treatment and the like.

The attachment portion of the aggregate 98 of the fine fibrous cellulose may be provided in any pattern. For example, the attachment portion of the aggregate 98 of the fine fibrous cellulose is striped along the vertical, horizontal, or diagonal directions, grid-like (including diagonal grid-like), dot-like (scattered spot-like), or continuous planar shape. Can be provided in. When the attachment portion of the aggregate 98 of the fine fibrous cellulose is made continuous in a linear shape such as a striped shape or a lattice shape, it can be made continuous in a straight line or in a curved or wavy line. However, since the aggregate 98 of the fine fibrous cellulose is hard, if it is continuous in the expansion / contraction direction, the elasticity of the body gather portion 90 may decrease. Therefore, as shown in FIG. 15B, the moisture absorbing portion 99 is provided with the attachment portion of the aggregate 98 of the fine fibrous cellulose in a vertical striped pattern continuous in the anteroposterior direction LD and intermittently in the width direction WD. If this is done, the fit of the body gather portion 90 is unlikely to deteriorate, which is preferable. Further, as shown in FIG. 15 (c), even if the adhesion portion of the aggregate 98 of the fine fibrous cellulose is provided intermittently in the anteroposterior direction LD and in a continuous horizontal stripe shape in the width direction WD in the moisture absorbing portion 99. good. Further, it is preferable that the aggregate 98 of the fine fibrous cellulose adheres to a wide area in consideration of the hygroscopic performance. Therefore, as shown in FIG. 15A, an adhering portion of the aggregate 98 of the fine fibrous cellulose may be formed over the entire moisture absorbing portion 99. Even in this case, if the amount of the aggregate 98 of the fine fibrous cellulose attached is small (for example, 10 g / m ² or less), the elasticity of the body gather portion 90 is excessively reduced and the touch is excessively hardened. It can be suppressed.

The size of the attachment portion of the aggregate 98 of the fine fibrous cellulose can be appropriately determined. When the attachment portion of the fine fibrous cellulose aggregate 98 has a dot-like pattern, the diameter of the attachment portion of the fine fibrous cellulose aggregate 98 is 98d (the length of the longest portion) as shown in FIG. 15 (d). Is preferably 1.0 to 4.0 mm, particularly 2.0 to 3.0 mm, and the center (or center of gravity) spacing x1 and y1 of the rows adjacent to the WD in the width direction and the LD in the front-rear direction are 5 to 25 mm, in particular. It is preferably 10 to 15 mm. Further, when the arrangement of the attachment portion of the fine fibrous cellulose aggregate 98 is a striped pattern, the line width of the attachment portion of the fine fibrous cellulose aggregate 98 is as shown in FIGS. 15 (b) and 15 (c). 98w is preferably 1.0 to 4.0 mm, particularly 2.0 to 3.0 mm, and the distance x2 and y2 of the attachment portions of the adjacent microfibrous cellulose aggregates 98 are 5 to 30 mm, particularly 10 to 10. It is preferably 20 mm.

If hygroscopicity is important, the hygroscopic portion 99 should be provided only on the non-exposed surface on the side close to the wearer's skin, as shown in FIGS. 16 (a), 17 (a) and 18 (a). Is preferable, and as shown in FIGS. 16 (b), 17 (b) and 18 (b), if the wearer's touch is important, only the non-exposed surface on the side far from the wearer's skin absorbs moisture. It is preferable to provide the unit 99.

Further, as shown in FIGS. 16, 17 and 18 (b) (c), the moisture absorbing portion 99 is provided on at least one facing surface of the adjacent sheet layers 12S, 12H, 71 with the elastic members 15 to 18 interposed therebetween. Even if it is provided, as shown in FIG. 15B, the adhesion portion of the aggregate 98 of the fine fibrous cellulose is provided in a vertical striped pattern, and as shown in FIG. 20, the adjacent sheet layer 12S, When 12H is bonded with the hot melt adhesive HM except for the portion overlapping the adhesion portion of the aggregate 98 of the fine fibrous cellulose, the bonding of the adjacent sheet layers 12S and 12H is ensured. Further, in the body gather portion 90, since the joining of the adjacent sheet layers 12S and 12H is intermittent at least in the width direction, the joining of the adjacent sheet layers 12S and 12H is performed when the body gather portion 90 is contracted to some extent. The portions located between the portions contract and swell in opposite directions to form a ventilation passage AR composed of a pair of folds PL, and the moisture absorbing portion 99 is formed only on the inner surface of the ventilation passage AR. Therefore, the air permeability of the body gather portion 90 is enhanced, and the hygroscopicity of the moisture absorbing portion 99 is improved by improving the contact efficiency with the moisture in the air. In addition, in "bonding adjacent sheet layers 12S and 12H with a hot melt adhesive HM except for a portion overlapping the adhesion portion of the aggregate 98 of fine fibrous cellulose", the example shown in FIG. 20 (a) is used. As described above, not only the structure in which the adjacent sheet layers 12S and 12H are joined by the hot melt adhesive HM or the like sandwiching the elastic members 15 to 18 intermittently in the width direction, but also in the example shown in FIG. 20 (b). As described above, the hot melt adhesive HM is also present in the portion overlapping the adhesion portion of the fine fibrous cellulose aggregate 98 (for example, continuous in the width direction), but the overlapping portion is due to the fine fibrous cellulose aggregate 98. Includes a structure in which the hot melt adhesive HM is not functioning (not adhered) due to adhesion inhibition.

The moisture absorbing portion 99 may be provided only on a part of the body gather portion 90, or may be provided over the entire body gather portion 90. Further, the moisture absorbing portion 99 may extend to other than the body gather portion 90 as long as it has a portion located at the body gather portion 90.

For example, in the case of the above-mentioned tape-type disposable diaper, as shown in the illustrated example, the aggregate 98 of the fine fibrous cellulose can be attached to almost the entire support sheet layer 71 of the elastic sheet 70 in the above-mentioned pattern. The moisture absorbing portion 99 is provided over almost the entire body gather portion 90.

In the case of pants-type disposable diapers, the body gathers 90 of the exterior bodies 12F, 12B, 12 have a wide range, so if the moisture absorbing part 99 is provided over the entire body gathers 90, the flexibility tends to decrease (of course, the entire body). May be provided). Therefore, it is desirable to provide the moisture absorbing portion 99 on both the front body F and the back body B, but it is also possible to provide the moisture absorbing portion 99 only on either the front body F or the back body B. Further, since the waist portion W of the pants-type disposable diaper is a portion that is pressed against the skin more strongly than other portions, a decrease in the flexibility of the waist portion W tends to lead to deterioration of the wearing feeling. Therefore, it is preferable to provide the moisture absorbing portion 99 in the portion of the body gather portion 90 excluding the waist portion W (the portion located in the lower waist portion U) as in the rear body B of the illustrated example. Further, in the case of the above-mentioned pants-type disposable diaper having the exterior body 12 having a three-layer structure, as shown in FIG. 17, the inner sheet layer 12H (in the case of the exterior body having a structure of four or more layers, another intermediate sheet layer may be used. It is preferable to provide the moisture absorbing portion 99 only on the outer surface of the moisture absorbing portion 99 because the thickness of the inside (skin side) and the outside of the moisture absorbing portion 99 can be secured by one or more layers, and the hardness of the moisture absorbing portion 99 can be easily concealed.

The size of the WD in the width direction of the moisture absorbing portion 99 can be appropriately determined, but it is preferably about 20 to 100% of the total width X of the disposable diaper. Further, the size of the LD in the front-rear direction of the moisture absorbing portion 99 can be appropriately determined, but it is preferably about 10 to 60% of the total length Y of the disposable diaper.

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

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

-"MD direction" and "CD direction" mean the flow direction (MD direction) in the manufacturing equipment and the lateral direction (CD direction) orthogonal to this, and one of them is the front-back direction depending on the part of the product. And the other is in the width direction. The MD direction of the nonwoven fabric is the direction of the fiber orientation of the nonwoven fabric. The fiber orientation is the direction along which the fibers of the non-woven fabric are aligned. It can be discriminated by a simple measurement method for determining the orientation direction.

・ "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 surface 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 in a standard state (test location: temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to bring it to a constant weight. Pre-drying refers to constant weight of a sample or test piece in an environment with a temperature of 100 ° C. For fibers with an official moisture content of 0.0%, pre-drying does not have to be performed. From the test piece in a constant weight state, a sample having a size of 100 mm × 100 mm is cut out using a 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 a basis weight.

-The "thickness" is automatically measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) under the conditions of a load of 0.098 N / cm ² and a pressurized area of 2 cm ² . The thickness of the perforated nonwoven fabric is measured at a portion other than the holes and the protrusions around them.

-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 of the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or device under standard conditions (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). do.

The present invention can be used for all absorbent articles such as pants-type disposable diapers, tape-type disposable diapers, pad-type disposable diapers, and sanitary napkins.

11 ... Liquid impermeable sheet, 12 ... Exterior body, 12A ... Side seal part, 12B ... Rear exterior body, 12F ... Front exterior body, 12H ... Inner sheet layer, 12S ... Outer sheet layer, 19 ... Unnecessary elastic member, 20 ... Cover non-woven fabric, 200 ... Interior body, 201 ... Inner / outer joint, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbent element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Rising gather, 62 ... Gather non-woven fabric , A1 ... non-woven fabric area, A2 ... stretchable area, C ... buttock cover part, L ... intermediate area, LD ... front-back direction, LO ... leg opening, T ... waist circumference area, U ... lower waist part, W ... waist part, WD ... width direction, WO ... waist opening, 21 ... exterior non-woven fabric, 71 ... support sheet layer, 91 ... first part, 92 ... second part, 90 ... body gather part, 99 ... moisture absorbing part, 98 ... fine fibrous cellulose Aggregate, 70 ... elastic sheet, 15-18, 72 ... elastic member, PL ... fold.